CN216715307U

CN216715307U - Communication valve, water return valve, pressure valve component and water supply system

Info

Publication number: CN216715307U
Application number: CN202123008896.2U
Authority: CN
Inventors: 巴喜亮; 梁国荣
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2021-04-30
Filing date: 2021-11-30
Publication date: 2022-06-10
Anticipated expiration: 2031-11-30

Abstract

The utility model discloses a communication valve, a water return valve, a pressure valve assembly and a water supply system. The water return valve comprises a valve body and a linkage valve. The valve body is provided with a hot water flow passage, a cold water flow passage and a one-way flow passage; the hot water flow passage comprises a water inlet cavity, a communication cavity and a water outlet cavity, wherein the communication cavity is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity; the one-way flow passage communicates the communicating cavity with the cold water flow passage. The linkage valve is arranged in the hot water flow channel and is suitable for switching between an initial position and an opening position; wherein: at the initial position, one end of the linkage valve blocks the water outlet, and a gap is formed between the other end of the linkage valve and the water inlet; and in the opening position, the linkage valve opens the water inlet and the water outlet. The water return valve can solve the problem that water in the hot water flow passage flows to the cold water flow passage in a cold water mode of the water supply system.

Description

Communication valve, water return valve, pressure valve component and water supply system

PRIORITY INFORMATION

The present application claims priority to "application No. 202120956351.5 entitled communication valve, water return valve, pressure valve assembly, and water supply system, as filed on 30/4/2021".

Technical Field

The utility model relates to the technical field of zero-cold-water supply, in particular to a communicating valve, a water return valve, a pressure valve assembly and a water supply system.

Background

Water supply systems, such as water supply systems for water heaters or wall-mounted boilers, are commonly used to provide water for users. The conventional water supply system generally comprises a gas supply device, a cold water pipe, a hot water pipe, a water mixing device and other structures; the gas supply device is connected with the water mixing device through the hot water pipe, so that hot water supplied by the gas supply device and cold water supplied by the cold water pipe are mixed into water with proper temperature by the water mixing device, and the water is supplied to the water outlet device (such as a water outlet structure of a shower head, a faucet and the like) for a user to use.

In the related art, in order to make the conventional water supply system have a zero-cold-water function, a water return valve is generally disposed in the water supply system, and the water return valve has a hot water flow passage, a cold water flow passage, and a one-way flow passage communicating the hot water flow passage and the cold water flow passage, and a one-way valve is disposed in the one-way flow passage. Therefore, when the water return valve is connected into the cold water pipe and the hot water pipe, a water return waterway can be formed in the water supply system, so that when the zero-cold-water mode is started, cold water at the water outlet end firstly flows back to the hot water supply device through the water return waterway, and then the cold water is supplied to the water outlet device after the hot water supply device is heated, and cold water at the initial stage of starting the water outlet device can be avoided.

However, for such a water supply system with zero cold water function, when the water pressure of the household pipeline of the user is high, if the cold water mode of the water supply system is turned on (such as opening cold water or flushing a toilet), the flow rate of the cold water is large, a large water pressure difference is easily formed on the cold and hot water sides, and the hot water in the hot water pipe of the water supply system is easy to push open the check valve of the water return valve under the action of the water pressure difference, so that a large amount of hot water flows into the cold water pipe, and further, the hot water supply device is started.

SUMMERY OF THE UTILITY MODEL

The utility model mainly aims to provide a water return valve, which aims to solve the technical problem that when a water supply system is started to use cold water alone, hot water in a hot water pipe of the water supply system is easy to flow into a cold water pipe through the water return valve in a series mode.

In order to achieve the purpose, the utility model provides a water return valve which comprises a valve body and a linkage valve. The valve body is provided with a hot water flow passage, a cold water flow passage and a one-way flow passage; the hot water flow passage comprises a water inlet cavity, a communication cavity and a water outlet cavity, wherein the communication cavity is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity; the one-way flow passage communicates the communicating cavity with the cold water flow passage. The linkage valve is arranged in the hot water flow channel and is suitable for switching between an initial position and an opening position; wherein: in the initial position, one end of the linkage valve blocks a water outlet of the communicating cavity, and a gap is formed between the other end of the linkage valve and a water inlet of the communicating cavity; and in the opening position, the linkage valve opens both the water inlet and the water outlet of the communication cavity.

Optionally, the linkage valve includes a valve core seat disposed in the water outlet cavity and used for plugging the water outlet of the communicating cavity, and a valve core disposed in the communicating cavity and linked with the valve core seat, and at the initial position, the valve core plugs the water inlet.

Optionally, the linkage valve further comprises a connecting shaft, the connecting shaft is provided with an upper shaft section connected with the valve core seat and a lower shaft section connected with the upper shaft section and inserted into the water outlet cavity, and the valve core is sleeved on the lower shaft section.

Optionally, the length of the valve core sleeved on the lower shaft section is adjustable, so that the size of a gap formed between the valve core and the water inlet of the communication cavity is adjustable.

Optionally, one end of the valve core is provided with a sleeve hole sleeved with the connecting shaft, and the other end of the valve core is communicated with an adjusting screw hole of the sleeve hole; the linkage valve further comprises an adjusting screw, and the adjusting screw is installed in the adjusting screw hole and is in contact fit with the end face of the connecting shaft.

Optionally, the valve core seat is sleeved on the upper shaft section of the connecting shaft; the linkage valve further comprises a pressure relief piece, the pressure relief piece is elastic, and the pressure relief piece is connected with the valve core seat and the upper shaft section.

Optionally, the pressure relief piece is configured as a first spring, one end of the first spring is connected with the valve core seat, and the other end of the first spring is connected with one end of the upper shaft section far away from the upper shaft section.

Optionally, a first limit groove is formed in a side surface of the valve core seat, which faces away from the valve core; one end of the first spring, which is connected with the valve core seat, is arranged in the first limiting groove.

Optionally, a second limit groove is formed in one end, far away from the valve core, of the upper shaft section of the connecting shaft; one end of the first spring connected with the upper shaft section is installed in the second limiting groove.

Optionally, an annular blocking portion is convexly provided on an outer peripheral wall of one end of the valve core, which is far away from the valve core seat, and in the initial position, the gap is formed between the annular blocking portion of the valve core and the inlet.

Optionally, the linkage valve further comprises a sealing gasket, and the sealing gasket is arranged on the lower surface of the valve core seat.

Optionally, the outer peripheral wall of the connecting shaft is convexly provided with a supporting portion, the supporting portion divides the connecting shaft into an upper shaft section and a lower shaft section, and two opposite side surfaces of the supporting portion are respectively suitable for supporting the valve core seat and the valve core.

Optionally, the water return valve further comprises a resetting piece, and the resetting piece is used for enabling the linkage valve to have the tendency of resetting to the initial position.

Optionally, the water return valve further comprises a one-way valve, and the one-way valve is arranged in the one-way flow channel and used for guiding water in the hot water flow channel to flow to the cold water flow channel in a one-way mode when water is returned.

The utility model also provides a water supply system which comprises a hot water supply device, a water mixing device and a water return valve. Wherein the hot water supply device has a water inlet pipe and a water outlet pipe. The hot water incoming end of the water mixing device is communicated with the water outlet pipe through a hot water pipe, and the cold water incoming end of the water mixing device is communicated with the water inlet pipe through a cold water pipe. The water return valve comprises a valve body and a linkage valve. The valve body is provided with a hot water flow passage, a cold water flow passage and a one-way flow passage; the hot water flow passage comprises a water inlet cavity, a communicating cavity and a water outlet cavity, and a water inlet and a water outlet of the communicating cavity are respectively communicated with the water inlet cavity and the water outlet cavity; the one-way flow passage communicates the communicating cavity with the cold water flow passage. The linkage valve is arranged in the hot water flow channel and is suitable for switching between an initial position and an opening position; wherein: in the initial position, one end of the linkage valve blocks a water outlet of the communicating cavity, and a gap is formed between the other end of the linkage valve and a water inlet of the communicating cavity; and in the opening position, the linkage valve opens both the water inlet and the water outlet of the communication cavity. And a hot water flow passage of the water return valve is connected to the hot water pipe, and a cold water flow passage of the water return valve is connected to the cold water pipe.

Optionally, the hot water supply device is a gas water heater or a gas wall-hanging stove or an electric water heater.

According to the technical scheme, the linkage valve is arranged in the hot water channel of the water return valve and is suitable for switching between the initial position and the open position, wherein in the initial position, one end of the linkage valve plugs the water outlet of the communicating cavity, and a gap is formed between the other end of the linkage valve and the water inlet of the communicating cavity, so that when water hammer occurs in switching cold water, the linkage valve keeps the initial position of the plugged water inlet, water flow in the hot water channel can not enter the cold channel, the situation that the hot water is discharged from the opened cold water is avoided, an obvious water flow signal is not easy to occur in a hot water pipe, and a hot water supply device is not easy to be started by mistake; and because a gap is formed between the linkage valve and the continuous water inlet, when cold water is closed and water hammer occurs, the pressure of the cold water pipe is transmitted backwards to the hot water supply device and then transmitted to the water inlet cavity of the hot runner of the water return valve through the hot water supply device, the gap can balance the pressure between the water inlet cavity and the water outlet cavity, so that the partial pressure in the water outlet cavity can be removed after the water hammer action is finished each time, and when a zero-cold-water mode is started subsequently, the pressure of the water outlet cavity is not easy to lock the linkage valve at the position for plugging the water inlet and the water outlet, so that the linkage valve can be easily pushed upwards by the pressure of the circulating water pump, and the zero-cold-water mode is started.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a unified embodiment of a water supply system according to the present invention;

FIG. 2 is a schematic structural diagram of a water return valve according to an embodiment of the present invention;

FIG. 3 is an enlarged view taken at A in FIG. 2;

FIG. 4 is a schematic view of the water return valve of FIG. 2 in a cold water mode;

FIG. 5 is a schematic view illustrating the state of the water return valve in FIG. 2 in a hot water mode;

FIG. 6 is a schematic diagram illustrating the state of the water return valve in FIG. 2 in a zero-cooling mode and when the pressure of the water inlet chamber and the water outlet chamber of the hot water flow passage is kept constant;

FIG. 7 is a schematic structural view of the linkage valve of FIG. 2;

FIG. 8 is an exploded view of the linkage valve of FIG. 7;

FIG. 9 is a schematic diagram illustrating the state of the water return valve in FIG. 2 in a zero-cooling mode and when the pressure of the water outlet chamber of the hot water flow passage is greater than the pressure of the water inlet chamber;

FIG. 10 is an enlarged view at B of FIG. 9;

FIG. 11 is a schematic structural view of another embodiment of the water supply system of the present invention;

FIG. 12 is a schematic view of an embodiment of the pressure valve assembly of FIG. 1 in a cold water mode;

FIG. 13 is a schematic view of the pressure valve assembly of FIG. 17 in a hot water mode;

FIG. 14 is a schematic view of the pressure valve assembly of FIG. 17 in a zero cold water mode with the pressure in the inlet and outlet chambers of the hot water flow path maintained;

FIG. 15 is a schematic view of the pressure valve assembly of FIG. 17 in a zero cold water mode with the outlet chamber pressure of the hot water flow passage being greater than the inlet chamber pressure;

FIG. 16 is an enlarged view at C of FIG. 15;

FIG. 17 is a schematic diagram of the communication valve of FIG. 12;

FIG. 18 is an enlarged view at D of FIG. 17;

FIG. 19 is a schematic view of the linkage valve of FIG. 17;

FIG. 20 is an exploded view of the linkage valve of FIG. 19;

FIG. 21 is a schematic structural view of another embodiment of the water supply system of the present invention;

FIG. 22 is a schematic diagram of an embodiment of the pressure valve assembly of FIG. 21.

The reference numbers illustrate:

table 1: description of the reference numerals of figures 1 to 10

Reference numerals	Name (R)	Reference numerals	Name (R)
				100	Valve body	332	Lower shaft section
110	Hot water flow passage	333	Supporting part
				111	Water inlet cavity	334	Second limit groove
112	Communicating cavity	340	Adjusting screw
				113	Water outlet cavity	350	Pressure relief/first spring
120	Cold water flow passage	360	Sealing gasket
				130	One-way flow passage	301	Gap between the two plates
200	One-way valve	302	Open space
				300	Linkage valve	400	Reset/second spring
310	Valve core seat	500	Water regulating valve
				311	First limit groove	10	Water return valve
320	Valve core	20	Hot water supply device
				321	Annular plugging part	30	Water mixing device
322	Socket joint hole	40	Water outlet device
				323	Adjusting screw hole	50	Hot water pipe
330	Connecting shaft	60	Cold water pipe
				331	Upper shaft section	70	Circulating water pump

Table 2: description of the reference symbols in the attached drawings 11 to 20

Reference numerals	Name (R)	Reference numerals	Name (R)
				100	Valve body	360	Sealing gasket
110	Hot water flow passage	301	Gap
				120	Cold water flow passage	302	Open space
130	One-way flow passage	400	Reset/second spring
				200	One-way valve	500	Water regulating valve
300	Linkage valve	600	Valve body
				310	Valve core seat	610	Hot water channel
311	First limit groove	611	Water inlet cavity
				320	Valve core	612	Communicating cavity
321	Annular plugging part	613	Water outlet cavity
				322	Socket joint hole	10	Water return valve
323	Adjusting screw hole	20	Hot water supply device
				330	Connecting shaft	30	Water mixing device
331	Upper shaft section	40	Water outlet device
				332	Lower shaft section	50	Hot water pipe
333	Supporting part	60	Cold water pipe
				334	Second limit groove	70	Circulating water pump
340	Adjusting screw	80	Communicating valve
				350	Pressure relief/first spring

The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if the description of "first", "second", etc. is provided in the embodiment of the present invention, the description of "first", "second", etc. is only for descriptive purposes and is not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied.

Fig. 1 to 10 are schematic views illustrating a water return valve and a water supply system according to an embodiment of the present invention. The reference numerals of fig. 1 to 10 are described in table 1 above. The return valve 10 is used to be connected to a cold water pipe 50 and a hot water pipe 60 of a water supply system to form a return water path in the water supply system, so that the water supply system has a zero-cold water mode, and it is also possible to solve a problem that hot water flows into the cold water pipe through a one-way flow passage of the return valve in series when the water supply system turns on the cold water mode.

Referring to fig. 2 and 3, in an embodiment of the water return valve of the present invention, the water return valve 10 includes a valve body 100 and a linkage valve 300. The valve body 100 is provided with a hot water flow passage 110, a cold water flow passage 120 and a one-way flow passage 130; the hot water flow passage 110 comprises a water inlet cavity 111, a communication cavity 112 and a water outlet cavity 113, wherein the communication cavity 112 is provided with a water inlet 112a communicated with the water inlet cavity 111 and a water outlet 112b communicated with the water outlet cavity 113; the one-way flow passage 130 communicates the communication chamber 112 with the cold water flow passage 120. The linkage valve 300 is arranged in the hot water runner 110, and the linkage valve 300 is suitable for switching between an initial position and an open position; wherein: at the initial position, one end of the linkage valve 300 is blocked by the water outlet 112b, and a gap 301 is formed between the other end of the linkage valve 300 and the water inlet 112 a; in the open position, the linkage valve 300 opens both the inlet 112a and the outlet 112 b.

Specifically, the check passage 130 of the return valve 10 is adapted to guide the flow of water from the hot water passage 110 to the cold water passage 120 in a single direction, but not in a reverse direction. To achieve a one-way flow of water in the one-way flow passage 130, a one-way valve 200 may be disposed in the one-way flow passage 130. The check valve 200 may have a variety of configurations, and various types of check valves are currently commercially available and are not listed here. Optionally, the check valve 200 includes a check valve core 210 movably disposed in the check passage 130, and a return spring 220 connecting the check valve core 210 and the valve body 100, and the check valve 200 has an open position for opening the check passage 130, and a closed position for closing the check passage 130 driven by the return spring 220.

The linkage valve 300 is installed in the hot water flow passage 110 of the water return valve 10, and the linkage valve 300 is adapted to move from the initial position to the open position when the difference between the water pressure in the inlet chamber 111 and the water pressure in the outlet chamber 113 of the hot water flow passage 110 increases, and has the following two meanings: 1) as soon as the difference between the water pressure in the inlet chamber 111 and the water pressure in the outlet chamber 113 begins to increase, the linkage valve 300 moves from the initial position to the open position; 2) when the difference between the water pressure in the inlet chamber 111 and the water pressure in the outlet chamber 113 increases to a predetermined value, the linkage valve 300 moves from the initial position to the open position. In the specific embodiment, the above two design modes can be selected according to actual requirements.

The hot water flow passage 110 of the water return valve 10 is further provided with a first connector 101 at the inlet of the water inlet cavity 111, and is provided with a second connector 102 at the outlet of the water outlet cavity 113; the cold water flow passage 120 of the return valve 10 is provided with a third connection port 103 at an inlet thereof and a fourth connection port 104 at an outlet thereof. When the water return valve 10 is assembled to a water supply system, the first connector 101 of the water return valve 10 is communicated with the hot water supply device 20 through the hot water pipe 50, and the second connector 102 is communicated with the hot water inlet 31 of the water mixing device 30; the third port 103 is connected to a cold water source (e.g., a tap water line) through the cold water pipe 60, and the fourth port 104 is connected to the cold water inlet 32 of the mixing device 30. In addition, the water supply system is provided with a circulating water pump 70, and the circulating water pump 70 is used for communicating the third interface 103 with the hot water supply device 20 and sucking cold water. The circulation water pump 70 may be provided on a line between the heat exchanger of the hot water supply device 20 and the cold water pipe 60. Specifically, the circulation water pump 70 is provided on the inlet pipe 21 of the hot water supply device 20.

The water supply system is provided with the water return valve 10, so that the water supply system at least has three working modes of a cold water mode, a hot water mode and a zero cold water mode. The operation principle of these three operation modes will be explained below, and please refer to the following in detail.

Referring to fig. 1 and 4, when the water supply system uses the cold water mode, the return valve 10 is at an initial position; at this time, the pressure of the cold water flow passage 120 of the water return valve 10 is reduced, and the water flow of the cold water pipe 60 flows from the cold water flow passage 120 to the cold water inlet 32 of the water mixing device 30, and then is supplied to the water outlet device 40 through the outlet of the water mixing device 30. At this time, the check valve spool 210 of the check valve 200 is in the closed position under the tension of the return spring 220.

When the water pressure of a user residential pipeline is high, a water hammer phenomenon occurs when the water supply system switches cold water, so that the pressure of the cold water pipe 60 is reduced, the pressure of the cold water flow passage 120 of the water return valve 10 is correspondingly reduced, the water inlet cavity 111 of the hot water flow passage 110 of the water return valve 10 is connected with the hot water pipe 50, the pressure of the hot water pipe 50 is higher than that of the cold water pipe 60, the water flow in the hot water pipe 50 tends to enter the cold water flow passage 120 from the water inlet cavity 111, and the linkage valve 300 tends to be pushed upwards; in addition, the hot water inlet end 31 of the water mixing device 30 is connected to the water outlet cavity 113 of the hot water flow channel 110, and the hot water inlet end 31 is in a closed state, so that the water outlet cavity 113 is in a pressure maintaining state, and the pressure reduction of the cold water flow channel 120 also enables the water outlet cavity 113 of the hot water flow channel 110 and the cold water flow channel 120 to generate a pressure difference, so that the water pressure of the water outlet cavity 113 also has a tendency of pushing the linkage valve 300 downwards, thereby counteracting the upward pushing force of the water inlet cavity 111 of the hot water flow channel 110 on the linkage valve 300, limiting the linkage valve 300 from moving upwards to open, enabling the linkage valve 300 to be kept at an initial position, blocking the water inlet 112a, enabling the water flow of the hot water flow channel 110 not to enter the cold flow channel 120, avoiding the situation that the cold water is discharged as hot water, thereby preventing the hot water pipe 50 from generating obvious water flow signals, and preventing the hot water supply device 20 from being started by mistake.

However, when the cold water is turned off, because a water hammer phenomenon may occur, at this time, the pressure of the cold water pipe 60 rises and is transmitted back to the hot water supply device 20, and then is transmitted to the hot runner 110 of the water return valve through the hot water supply device 20, the linkage valve 300 is briefly flushed open, so that the linkage valve 300 moves upwards, and further the water inlet 112a and the water outlet 112b are briefly opened, due to the action of the resetting piece 400 of the linkage valve 300, the linkage valve 300 is reset to the initial position for closing the water inlet 112a, that is, the upper part of the linkage valve 300 forms a pressure maintaining structure, after each time of the water hammer action, the pressure in the water outlet cavity 113 increases, if the continuous pressure of the part cannot be removed, when the user opens the zero cold water mode, the pressure of the water outlet cavity 113 locks the linkage valve 300 at the position for blocking the water inlet 112a and the water outlet 112b, so that the pressure of the circulating water pump 70 is not enough to lift the linkage valve 300 upwards, resulting in the failure to activate the zero cold water function. Therefore, in the solution of the present embodiment, when the linkage valve 300 is in the initial position, a gap 301 is provided between the linkage valve 300 and the water inlet 112a of the communication cavity 112, specifically, the linkage valve 300 covers but does not completely block the water inlet 112a of the communication cavity 112 in the initial position, so that a narrow gap 301 is formed between the linkage valve 300 and the water inlet 112a (note that, the gap is not enough to make the water inlet 112a in the open state). When the water hammer phenomenon occurs when the cold water is closed, the pressure of the cold water pipe 60 is transmitted backwards to the hot water supply device 20, and then is transmitted to the water inlet cavity 111 of the hot runner 110 of the water return valve 10 through the hot water supply device 20, at this time, the narrow gap 301 between the linkage valve 300 and the water inlet 112a can balance the pressure between the water inlet cavity 111 and the water outlet cavity 113, so that the partial pressure in the water outlet cavity 113 can be removed after the water hammer action is finished each time, and when the zero-cold-water mode is subsequently started, the pressure of the water outlet cavity 113 cannot easily lock the linkage valve 300 at the position for blocking the water inlet 112a and the water outlet 112b, so that the pressure of the circulating water pump 70 can easily push the linkage valve 300 upwards to open, and then the zero-cold-water mode is started.

Referring to fig. 1 and 5, when the water supply system uses the hot water mode, the pressure of the water outlet cavity 113 of the hot water flow channel 110 in the water return valve 10 is reduced and is reduced to be smaller than the pressure of the water inlet cavity 111, so that the difference between the pressure in the water inlet cavity 111 and the pressure in the water outlet cavity 113 is increased, the water flow of the water inlet cavity 111 pushes the linkage valve 300 upwards, so that the linkage valve 300 moves to the open position, and the water flow of the hot water pipe 50 flows from the hot water flow channel 110 to the water outlet cavity 113 through the water inlet cavity 111, enters the water mixing device 30 from the hot water inlet end 31 of the water mixing device 30, and is supplied to the water outlet device 40 through the outlet of the water mixing device 30. The flow rate of the hot water pipe 50 is increased and the hot water supply device 20 is activated to prepare hot water. At this time, the check valve spool 210 of the check valve 200 is in the closed position under the tension of the return spring 220.

Referring to fig. 1 and 6, when the water supply system uses the zero-cooling mode, the circulating water pump 70 is turned on to push water to flow, so that the water pressure of the hot water pipe 50 rises, the pressure of the water inlet cavity 111 of the hot water channel 110 in the water return valve 10 increases, thereby pushing the linkage valve 300 to move upward, when the water supply system is stationary, the pressures of the water inlet cavity 111 and the water outlet cavity 113 of the water return valve 10 are leveled, at this time, the linkage valve 300 reaches an open position, the linkage valve 300 opens the water inlet 112a of the communication cavity 112, a large amount of water in the hot water pipe 50 enters the one-way channel 130, thereby overcoming the acting force of the return spring 220 to open the one-way valve 200, the water flows through the one-way channel 130 into the cold water channel 120, and then flows from the cold water channel 120 through the cold water pipe 60 to the hot water supply device 20 for circulating preheating.

According to the technical scheme, the linkage valve 300 is arranged in the hot water channel 110 of the water return valve 10, and the linkage valve 300 is suitable for switching between an initial position and an open position, wherein in the initial position, one end of the linkage valve 300 blocks the water outlet 112b of the communicating cavity 112, and a gap 301 is formed between the other end of the linkage valve 300 and the water inlet 112a of the communicating cavity 112, so that when cold water hammer occurs during switching, the linkage valve 300 keeps at the initial position where the water inlet 112a is blocked, water flow of the hot water channel 110 cannot enter the cold channel 120, and hot water discharging of the cold water is avoided, so that an obvious water flow signal is not easy to occur in the hot water pipe 50, and the hot water supply device 20 is not easy to be started by mistake; moreover, because a gap 301 is formed between the linkage valve 300 and the continuous water inlet 112a, when water hammer occurs when cold water is closed, the pressure of the cold water pipe 60 is transmitted backwards to the hot water supply device 20, and then transmitted to the water inlet cavity 111 of the hot runner 110 of the water return valve 10 through the hot water supply device 20, the gap 301 can balance the pressure between the water inlet cavity 111 and the water outlet cavity 113, so that the partial pressure in the water outlet cavity 113 can be removed after the water hammer is finished each time, and when a zero-cold-water mode is subsequently started, the pressure of the water outlet cavity 113 cannot easily lock the linkage valve 300 at the position for blocking the water inlet 112a and the water outlet 112b, so that the pressure of the circulating water pump 70 can easily push the linkage valve 300 upwards to open the zero-cold-water mode.

Referring to fig. 2, 7 and 8, in an embodiment, the linkage valve 300 includes a valve core seat 310 disposed in the water outlet cavity 113 for blocking the water outlet 112b of the communication cavity 112, and a valve core 320 disposed in the communication cavity 112 and linked with the valve core seat 310; in the initial position, the valve element 320 blocks the water inlet 112 a.

Specifically, the valve core seat 310 and the valve core 320 of the linkage valve 300 are linked in the same direction. In the initial position, the linkage valve 300 blocks the water outlet 112b of the communication cavity 112 through the valve core seat 310, and the valve core 320 of the linkage valve 300 blocks the water inlet 112a of the communication cavity 112, at this time, the peripheries of the valve core 320 and the water inlet 112a are not completely sealed, but a small gap 301 is reserved between the valve core 320 and the water inlet 112 a. When the linkage valve 300 moves upwards to the opening position under the action of the water pressure difference at the two sides, the valve core seat 310 of the linkage valve 300 opens the water outlet 112b of the communication cavity 112, and the valve core 320 of the linkage valve 300 opens the water inlet 112a of the communication cavity 112. And vice versa.

Referring to fig. 2, 7 and 8, there are many designs for the way of the valve core seat 310 and the valve core 320 of the linkage valve 300 to be linked. For example, in one embodiment, the linkage valve 300 further includes a connecting shaft 330, the connecting shaft 330 has an upper shaft section 331 connected to the valve core seat 310, and a lower shaft section 332 connected to the upper shaft section 331 and inserted into the water outlet cavity 113, and the valve core 320 is sleeved on the lower shaft section 332.

Specifically, the outer peripheral wall of the connecting shaft 330 is convexly provided with a support portion 333, the connecting shaft 330 is divided into an upper shaft section 331 and a lower shaft section 332 by the support portion 33, and opposite side surfaces of the support portion 333 are adapted to support the valve core seat 310 and the valve core 320, respectively. The lower shaft section 332 of the connecting shaft 330 penetrates the communicating chamber 112 from the upper shaft section 331 through the water outlet 112b, and is fixedly connected to the valve element 320. The valve cartridge seat 310 and the valve cartridge 320 are coupled together by a coupling shaft 330, so that the valve cartridge seat 310 and the valve cartridge 320 are interlocked. In addition, in other embodiments, a connecting portion may be protruded from one of the valve core seat 310 and the valve core 320 to the other, so that the two are connected together through the connecting portion to realize linkage.

Referring to fig. 2, 7 and 8, in an embodiment, after the linkage valve 300 is installed in the hot water flow passage 110 of the water return valve 10, a problem of a zero gap or an excessively large gap occurs between the valve element 320 of the linkage valve 300 and the water inlet 112a of the communication cavity 112 of the hot water flow passage 110, considering that a structural design or an assembly error may exist in a design process of the water return valve 10. To reduce this, the length of the valve core 320 sleeved on the lower shaft section 332 is optionally set to be adjustable, so that the size of the gap 301 formed between the valve core 320 and the water inlet 112a of the communication cavity 112 is adjustable. Wherein, h in FIG. 3₁The length of the valve element 320 that is disposed on the lower shaft segment 332; h is₂Indicated by the size of the gap 301 between the valve core 320 and the water inlet 112a of the communication chamber 112. The size of the gap 301 refers to the width in the axial direction of the coupling shaft 330.

Specifically, the upper end of the valve element 320 is sleeved on the lower shaft section 332, and a water inlet 112a of the communication chamber 112 is formed between the lower end of the valve element 320 and the water inlet 112aA gap 301. Therefore, by adjusting the length of the valve element 320 sleeved on the upper end of the lower shaft section 332, the distance between the lower end of the valve element 320 and the water inlet 112a of the communication chamber 112 can be adjusted, so as to adjust the size of the gap 301 formed between the valve element 320 and the water inlet 112a of the communication chamber 112. For example, if the length of the valve element 320 sleeved on the upper end of the lower shaft section 332 is reduced, the lower end of the valve element 320 will approach the water inlet 112a of the communication chamber 112, so as to reduce the distance between the lower end of the valve element 320 and the water inlet 112a of the communication chamber 112, and reduce the gap 301 between the valve element 320 and the water inlet 112a of the communication chamber 112 (i.e. h₁Decrease, then h₂Also decreases).

Referring to fig. 2, 7 and 8, as for the length-adjustable manner of the valve element 320 sleeved on the lower shaft section 332, there may be a plurality of design manners. In one embodiment, one end of the valve core 320 is provided with a sleeve hole 322 sleeved with the lower shaft section 332, and the other end is provided with an adjusting screw hole 323 communicated with the sleeve hole 322; the valve core 320 further comprises an adjusting screw 340, and the adjusting screw 340 is installed in the adjusting screw hole 323 and is in contact fit with the end face of the lower shaft section 332.

When the size of the gap 301 needs to be adjusted, the adjusting screw 340 is rotated, because the inner end surface of the adjusting screw 340 contacts and abuts against the end surface of the lower shaft section 332, the relative position of the adjusting screw 340 and the lower shaft section 332 is not changed, and the valve core 320 in threaded fit with the adjusting screw 340 extends and retracts along the axial direction of the lower shaft section 332 relative to the lower shaft section 332, so that the length of the valve core 320 sleeved on the lower shaft section 332 is changed, and the length of the valve core 320 sleeved on the lower shaft section 332 is adjustable.

Of course, in another embodiment, an internal thread may be directly disposed on an inner circumferential surface of the sleeving hole 322 of the valve element 320, and an external thread may be disposed on an outer circumferential surface of the lower shaft section 332, so that the internal thread of the valve element 320 is matched with the external thread of the lower shaft section 332, and thus, the length of the valve element 320 sleeved on the lower shaft section 332 may be changed by directly rotating the valve element 320, and further, the length of the valve element 320 sleeved on the lower shaft section 332 may be adjusted.

As for the position of the gap 301 formed between the valve core 320 and the water inlet 112a of the communication chamber 112, optionally, an annular blocking portion 321 is convexly provided on the outer peripheral wall of one end of the valve core 320 away from the valve core seat 310, and in the initial position, the gap 301 is formed between the annular blocking portion 321 and the water inlet 112a of the communication chamber 112. It is understood that the valve body 320 covers but does not completely block the water inlet 112a of the communication chamber 112 by the annular blocking portion 321, so that a narrow gap 301 is formed between the annular blocking portion 321 and the water inlet 112 a.

Referring to fig. 2, fig. 7 and fig. 8, according to any of the above embodiments, the water return valve 10 further includes a resetting member 400, and the resetting member 400 is used for enabling the linkage valve 300 to have a tendency of resetting to the initial position. In this way, the reset piece 400 can drive the linkage valve 300 to reset to the initial position after the hot water in the water outlet device 40 is used or the hot water in the hot water pipe 50 is preheated. The reset element 400 may also be a spring, a spring plate, or an extension spring, etc. having an elastic structure

Optionally, the reset member 400 is configured as a second spring 400, one end of the second spring 400 is fixed in the water outlet cavity 113, and the other end of the second spring 400 is connected to the linkage valve 300. The second spring 400 is used to force the linkage valve 300 core to have a tendency to return to the initial position. Therefore, on the one hand, after the hot water in the water outlet device 40 is used or the hot water in the hot water pipe 50 is preheated, the second spring 400 can drive the linkage valve 300 to return to the initial position; on the other hand, the second spring 400 can also limit the linkage valve 300 at the initial position, so as to ensure the stability of the linkage valve 300 in use at the initial position.

Referring to fig. 4, 7 and 8, according to any of the above embodiments, the linkage valve 300 further includes a pressure relief member 350, the pressure relief member 350 has elasticity, and the pressure relief member 350 connects the valve core seat 310 and the upper shaft section 331. Therefore, when a water hammer occurs when cold water is switched on and off, the pressure of the water inlet cavity 111 of the hot water channel 110 of the water return valve 10 rises (rises by about 0.2-0.3 MPa), the pressure difference between the water inlet cavity 111 and the water outlet cavity 113 of the hot water channel 110 is greater than the tension of the pressure relief piece 350 to push the valve core 320 of the linkage valve 300 to move slightly upwards, the valve core 320 drives the valve core seat 310 to abut against the pressure relief piece 350 through the connecting shaft 330, so that the tension (for example, about 0.1 MPa) of the pressure relief piece 350 is overcome to ensure that the pressure of the water outlet cavity 113 of the hot water channel 110 is not too high, meanwhile, a certain pressure difference exists, the linkage valve 300 can be better maintained at an initial position and not opened in a cold water opening mode, the problem of water cross-flow after the cold water opening action is opened is avoided, and the linkage valve 300 can be easily opened after a subsequent working mode is switched.

Based on this, due to the existence of the pressure relief member 350, even if the cold water mode switch cold water has a water hammer phenomenon, the pressure in the water outlet cavity 113 of the hot water channel 110 is not too large. Therefore, as shown in fig. 6, after the zero-cold-water mode is started, the circulating water pump 70 pushes water to flow, so that the pressure of the water inlet cavity 111 of the water return valve 10 is increased, the pressure generated by the circulating water pump 70 in the water inlet cavity 111 of the water return valve 10 can better offset the pressure difference, and further the linkage valve 300 is pushed to move upwards, so that the linkage valve 300 can be normally opened, and water circulation preheating is realized. Therefore, the situation that the linkage valve 300 is difficult to normally open due to the fact that the linkage valve 300 is locked at the initial position because the water outlet cavity 113 of the hot water flow channel 110 in the water return valve 10 keeps high pressure after the zero-cold-water mode is started can be effectively reduced.

Referring to fig. 7 and 8, for the specific structure of the pressure relief member 350, the pressure relief member 350 may also be an elastic structure such as a spring, a leaf spring or an extension spring. In the present embodiment, the pressure relief 350 is configured as a first spring 350. To improve the stability of the installation of the pressure relief member 350, optionally, the side of the valve core seat 310 facing the first spring 350 is provided with a first limiting groove 311; one end of the first spring 350 connected to the valve core seat 310 is installed in the first limiting groove 311. A second limit groove 334 is further arranged at one end, far away from the valve core 320, of the upper shaft section 331 of the connecting shaft 330; one end of the first spring 350 connected to the upper shaft section 331 is installed in the second limit groove 334.

Specifically, the upper end of the first spring 350 is mounted in the second limiting groove 334, so that the upper end of the first spring 350 is not easy to fall off from the connecting shaft 330; the lower end of the first spring 350 is mounted in the first limiting groove 311, so that the lower end of the first spring 350 is not easily detached from the valve core seat 310.

Referring to fig. 7 and 8, in an embodiment, the linkage valve 300 further includes a gasket 360, and the gasket 360 is disposed on a lower surface of the valve core seat 310. Specifically, the lower surface of the valve core seat 310 is convexly provided with a mounting part around the periphery of the connecting shaft 330; the gasket 360 is fitted over the mounting portion 312. The gasket 360 may be made of a material having elasticity, such as rubber, so that the gasket 360 can be elastically deformed.

Referring to fig. 9 and 10, when the pressure of the water outlet cavity 113 of the hot water flow channel 110 of the water return valve 10 is higher than the pressure of the water inlet cavity 111 thereof, so that the linkage valve 300 is difficult to open normally, due to the existence of the sealing gasket 360, after the zero-cold-water mode is opened, the pressure of the water inlet cavity 111 of the hot water flow channel 110 of the water return valve 10 increases, and the valve core 320 tends to move upward, at this time, the valve core 320 is pressed by the upper valve core seat 310, but the pressure of the water inlet cavity 111 of the hot water flow channel 110 increases due to water circulation, so that the pressure difference between the water inlet cavity 111 and the water outlet cavity 113 decreases (generally, it may be 0.05-0.08 MPa smaller), and the valve core 320 slightly moves upward through the connecting shaft 330 during the pressure decrease due to a certain elastic deformation of the sealing gasket 360, but is not enough for the valve core seat 310 to open the water outlet 112b of the communication cavity 112, and a gap 301 reserved between the valve core 320 and the water inlet 112a of the communication cavity 112 forms a larger opening void A slot 302. That is, the size of the opening gap 302 is the sum of the amount of micro-displacement that occurs in this case of the gap 301 and the spool 320. Therefore, in this case, even if the linkage valve 300 does not completely open the water inlet 112a of the communication cavity 112, the opening gap 302 can ensure that the circulation flow is about 4L/min, and the zero-cold-water use is met.

Referring to fig. 4, according to any of the above embodiments, the water return valve 10 further includes a water regulating valve 500, and the water regulating valve 500 is installed in the cold water flow passage 120 through the installation opening to regulate the flow rate of water in the cold water flow passage 120. Optionally, the hot water flow passage 110 is a straight flow passage, and/or the cold water flow passage 120 is a straight flow passage, and/or the one-way flow passage 130 is a straight flow passage. Of course, in other embodiments, any one or more of the hot water channel 110, the cold water channel 120, and the one-way channel 130 may be provided as an L-shaped channel.

Referring to fig. 1, the present invention further provides a water supply system, which includes a hot water supply device 20, a water mixing device 30 and a water return valve 10. Wherein, the hot water supply device 20 is provided with a water inlet pipe 21 and a water outlet pipe 22; the hot water inlet end 31 of the water mixing device 30 is communicated with the water outlet pipe 22 through a hot water pipe 50, and the cold water inlet end 32 of the water mixing device 30 is communicated with the water inlet pipe 21 through a cold water pipe 60; the hot water flow path 110 of the return valve 10 is connected to the hot water pipe 50, the cold water flow path 120 of the return valve 10 is connected to the cold water pipe 60, and the detailed structure of the return valve 10 is described with reference to the above-described embodiment. Since the water supply system adopts all technical solutions of all the embodiments, all the beneficial effects brought by the technical solutions of the embodiments are also achieved, and are not repeated herein.

Optionally, the water supply system further comprises a water outlet device 40, and the water outlet device 40 is connected with the output end 33 of the water mixing device 30. The number of the water outlet means 40 may be one or two or more. When the number of the water discharge devices 40 is two or more, a water return valve 10 may be provided for each water discharge device 40, or a water return valve 10 may be provided only for the water discharge device 40 disposed at the farthest end. Of course, in other embodiments, the water outlet device 40 may be provided by the user.

As for the specific type of the hot water supply device 20, the hot water supply device 20 may be a gas water heater or a gas wall-hanging stove or an electric water heater, and may be configured appropriately according to the market or the user's needs, and is not particularly limited herein.

In the cold water mode, as the pressure of the cold water pipe 60 is reduced, the pressure of the cold water flow passage 120 of the water return valve 10 is reduced, the water inlet cavity 111 of the hot water flow passage 110 of the water return valve 10 is connected to the hot water pipe 50, the pressure of the hot water pipe 50 is higher than that of the cold water pipe 60, and the water flow in the hot water pipe 50 tends to enter the cold water flow passage 120 from the water inlet cavity 111, so that the linkage valve 300 tends to be pushed upwards; in addition, the hot water inlet end 31 of the water mixing device 30 is connected to the water outlet cavity 113 of the hot water flow channel 110, and the hot water inlet end 31 is in a closed state, so that the water outlet cavity 113 is in a pressure maintaining state, and the pressure reduction of the cold water flow channel 120 also enables the water outlet cavity 113 of the hot water flow channel 110 and the cold water flow channel 120 to generate a pressure difference, so that the water pressure of the water outlet cavity 113 also has a tendency of pushing the linkage valve 300 downwards, thereby counteracting the upward pushing force of the water inlet cavity 111 of the hot water flow channel 110 on the linkage valve 300, limiting the linkage valve 300 from moving upwards and opening, and enabling the linkage valve 300 to be kept at an initial position.

However, because the pressure of the cold water flow passage 120 of the water return valve 10 is suddenly lost, the pressure of the water inlet chamber 111 of the hot water flow passage 110 is relatively higher than the pressure of the cold water flow passage 120, which easily causes the pressure of the water inlet chamber 111 to be slightly higher than the pressure of the water outlet chamber 113, and a water hammer phenomenon occurs. In this case, if the linkage valve 300 is completely and hermetically matched with the water inlet 112a of the communicating cavity 112 in a zero clearance, the upward acting force applied to the linkage valve 300 by the water flow of the water inlet cavity 111 is greater than the downward acting force applied to the linkage valve 300 by the water flow of the water outlet cavity 113, so that the linkage valve 300 is pushed upward by the water flow of the water inlet cavity 111, the water inlet 112a of the communicating cavity 112 is opened by the linkage valve 300, a large amount of water flow in the hot water pipe 50 enters the communicating cavity 112, and further the one-way valve 200 is flushed from the communicating cavity 112 to enter the cold water flow channel 120, and the increase in the water flow in the hot water pipe 50 is very easy to trigger the hot water supply device 20 to start, so that the hot water supply device 20 starts when cold water is boiled.

In fact, in this embodiment, when the linkage valve 300 is in the initial position, a gap 301 is provided between the linkage valve 300 and the water inlet 112a of the communication cavity 112, specifically, the linkage valve 300 covers but does not completely block the water inlet 112a of the communication cavity 112 in the initial position, so that a narrow gap 301 is formed between the linkage valve 300 and the water inlet 112a (note that, the gap is not enough to make the water inlet 112a in the open state). When a water hammer phenomenon occurs in a cold water mode, a small part of water flow of the water inlet cavity 111 of the hot water flow channel 110 enters the communicating cavity 112 from the gap 301, so that pressure relief of the water inlet cavity 111 is realized, and the condition that the pressure of the water inlet cavity 111 is greater than that of the water outlet cavity 113 is reduced, so that an upward acting force applied to the linkage valve 300 by the water flow of the water inlet cavity 111 is basically the same as a downward acting force applied to the linkage valve 300 by the water flow of the water outlet cavity 113, thereby limiting the water flow of the water inlet cavity 111 to upwards jack the linkage valve 300, keeping the linkage valve 300 at an initial position, and further greatly reducing the amount of water leaked to the communicating cavity 112 in the hot water pipe 50.

The small amount of water is not enough to push the check valve 200 open, so that the water flow in the hot water pipe 50 does not flow to the cold water flow passage 120 through the check flow passage 130 in a large amount, and the small amount of water is far less than the flow rate of the hot water supply device 20 when the hot water supply device 20 is started, thereby solving the problem that the water flow in the hot water pipe 50 flows to the cold water flow passage 120 when the water hammer phenomenon occurs in the cold water mode, effectively reducing the situation that the hot water supply device 20 is started accidentally due to the increase of the flow rate of the hot water pipe 50, and realizing that the hot water supply device 20 is not started when the cold water is started.

Fig. 11 to 22 are schematic views illustrating a communication valve, a pressure valve assembly and a water supply system according to an embodiment of the present invention. The reference numerals in fig. 11 to 22 are described in table 2 above. The communication valve 80 may be assembled with the return valve 10 as a pressure valve assembly, and when the pressure valve assembly is connected to the cold water pipe 50 and the hot water pipe 60 of the water supply system, a return water path may be formed in the water supply system, so that the water supply system has a zero-cold water mode, and a problem that hot water is streamed to the cold water pipe when the water supply system opens a cold water mode is solved, without changing a basic structure of the return valve 10. That is, the communication valve 80 may be separately manufactured and assembled with the return valve 10 to be used as a pressure valve assembly without requiring a user to replace or discard the existing return valve 10. Of course, the communication valve 80 may also be sold as a kit with the return valve 10 assembled as a pressure valve assembly. The water return valve 10 may be an H-type water return valve (as shown in fig. 11 and 12), or may be a water return valve having another shape (as shown in fig. 21 and 22). The communication valve 80 will be described in detail below.

Referring to fig. 17 and 18, in an embodiment of the water return valve according to the utility model, the communication valve 80 includes a valve body 600 and a linkage valve 300. The valve body 600 is provided with a hot water channel 610, the hot water channel 610 comprises a water inlet cavity 611, a communication cavity 612 and a water outlet cavity 613, the communication cavity 612 is provided with a water inlet 612a communicated with the water inlet cavity 611 and a water outlet 612b communicated with the water outlet cavity 613; the hot water passage 610 is further provided with a docking port 603, and the docking port 603 is adapted to communicate with an inlet end of the check flow passage 130 of the return valve 10 to communicate with the cold water flow passage 120 of the return valve 10 through the check flow passage 130. A linkage valve 300 is provided within the hot water passageway 610, the linkage valve 300 being adapted to be switched between an initial position and an open position, wherein: in the initial position, one end of the linkage valve 300 blocks the water outlet 612b, and a gap 301 is formed between the other end of the linkage valve 300 and the water inlet 612 a; in the open position, the linkage valve 300 opens both the inlet 612a and the outlet 612 b.

Specifically, the linkage valve 300 is installed in the hot water passage 610 of the communication valve 80, and the linkage valve 300 is adapted to move from the initial position to the open position when the difference between the water pressure in the inlet chamber 611 of the hot water passage 610 and the water pressure in the outlet chamber 613 increases, and has the following two meanings: 1) the linkage valve 300 moves from the initial position to the open position as soon as the difference between the water pressure in the inlet chamber 611 and the water pressure in the outlet chamber 613 begins to increase; 2) when the difference between the water pressure in the inlet chamber 611 and the water pressure in the outlet chamber 613 increases to a predetermined value, the linkage valve 300 moves from the initial position to the open position. In the specific embodiment, the above two design modes can be selected according to actual requirements.

Referring to fig. 12, the hot water passage 610 of the communication valve 80 is further provided with a water inlet connector 601 at an inlet of the water inlet cavity 611, and is provided with a water outlet connector 602 at an outlet of the water outlet cavity 613. For convenience of description of the manner in which the communication valve 80 and the return valve 10 are assembled into a pressure valve assembly, the basic structure of the return valve 10 will be described first. The water return valve 10 includes a valve body 100, and the valve body 100 of the water return valve 10 includes a hot water flow passage 110, a cold water flow passage 120, and a check flow passage 130 for communicating the hot water flow passage 110 with the cold water flow passage 120. The hot water flow passage 110 of the water return valve 10 has a first connection port 101 and a second connection port 102; the cold water channel 120 has a third connection 103 and a fourth connection 104. When the communication valve 80 and the return valve 10 are assembled, one of the first port 101 and the second port 102 of the return valve 10 is connected to the connection port 603 of the communication valve 80, and the other is sealed, so that the communication valve 80 and the return valve 10 can be assembled into a pressure valve assembly. The butt joint port 603 of the communication valve 80 is integrally connected with the first port 101 and the second port 102 of the water return valve 10, or the butt joint port 603 of the communication valve 80 is detachably connected with the first port 101 and the second port 102 of the water return valve 10. Specifically, the butt joint port 603 of the communication valve 80 is detachably connected to the first joint port 101 of the water return valve 10; for example, a screw thread is provided at the docking port 603 of the communication valve 80 so that the docking port 603 is screwed with the first port 101 of the return valve 10.

When the pressure valve assembly is assembled to a water supply system, the water inlet interface 601 of the communication valve 80 is communicated with the hot water supply device 20 through the hot water pipe 50, and the water outlet interface 602 of the communication valve 80 is communicated with the hot water inlet end 31 of the water mixing device 30; the third port 103 of the cold and hot valve 10 is connected to a cold water supply source (such as a tap water line) through the cold water pipe 60, and the fourth port 104 is connected to the cold water inlet 32 of the mixing device 30. In addition, the water supply system is provided with a circulating water pump 70, and the circulating water pump 70 is used for communicating the third interface 103 with the hot water supply device 20 and sucking cold water. The circulation water pump 70 may be provided on a line between the heat exchanger of the hot water supply device 20 and the cold water pipe 60. Specifically, the circulation water pump 70 is provided on the inlet pipe 21 of the hot water supply device 20.

The water supply system is provided with the pressure valve assembly, so that the water supply system at least has three working modes, namely a cold water mode, a hot water mode and a zero cold water mode. The operation principle of these three operation modes will be explained below, and please refer to the following in detail.

Referring to fig. 11 and 12, when the water supply system uses the cold water mode, the linkage valve 300 is in an initial position; at this time, the pressure in the cold water flow passage 120 of the water return valve 10 is reduced, and the water in the cold water pipe 60 flows from the cold water flow passage 120 to the cold water inlet 32 of the water mixing device 30, and then is supplied to the water outlet device 40 through the outlet of the water mixing device 30. At this time, the check valve spool 210 of the check valve 200 is in the closed position under the tension of the return spring 220.

In the cold water mode, the pressure of the cold water pipe 60 is reduced, so that the pressure of the cold water flow passage 120 of the water return valve 10 is reduced, the inlet cavity 611 of the hot water passage 610 of the communication valve 80 is connected with the hot water pipe 50, the pressure of the hot water pipe 50 is higher than that of the cold water pipe 60, and the water flow in the hot water pipe 50 tends to enter the cold water flow passage 120 from the inlet cavity 611, so that the linkage valve 300 tends to be pushed towards the outlet cavity 613; in addition, the outlet cavity 613 of the hot water channel 610 is connected to the hot water inlet 31 of the water mixing device 30, and the hot water inlet 31 is in a closed state, so the outlet cavity 613 is in a pressure maintaining state, and the pressure reduction of the cold water channel 120 also causes a pressure difference between the outlet cavity 613 of the hot water channel 610 and the cold water channel 120, so the water pressure of the outlet cavity 613 also has a tendency of pushing the linkage valve 300 towards the inlet cavity 611, thereby counteracting the thrust of the inlet cavity 611 of the hot water channel 610 to the linkage valve 300, limiting the linkage valve 300 from moving open, and keeping the linkage valve 300 at an initial position.

However, since the water pressure in the cold water channel 120 of the water return valve 10 is suddenly lost, the pressure in the water inlet cavity 611 of the hot water channel 610 in the communication valve 80 is relatively higher than the pressure in the cold water channel 120, which easily causes the pressure in the water inlet cavity 611 to be slightly higher than the pressure in the water outlet cavity 613, and a water hammer phenomenon occurs. In this case, if the linkage valve 300 is completely and hermetically matched with the water inlet 612a of the communication cavity 612 with a zero clearance, the acting force of the water flow of the water inlet cavity 611 on the linkage valve 300 to push the water outlet cavity 613 is greater than the acting force of the water flow of the water outlet cavity 613 on the linkage valve 300 to push the water inlet cavity 611, so that the water flow of the water inlet cavity 611 opens the linkage valve 300, the linkage valve 300 opens the water inlet 612a of the communication cavity 612, a large amount of water flow in the hot water pipe 50 enters the communication cavity 612, and then flows from the communication cavity 612 to the one-way flow channel 130 through the hot water flow channel 110 of the water return valve 10, and further flushes the one-way valve 200 in the one-way flow channel 130 to enter the cold water flow channel 120, and the increase of the water flow in the hot water pipe 50 is very easy to trigger the start-up of the hot water supply device 20, and the hot water supply device 20 starts up when cold water is opened.

In fact, in this embodiment, when the linkage valve 300 is in the initial position, a gap 301 is provided between the linkage valve 300 and the water inlet 612a of the communication cavity 612, specifically, the linkage valve 300 covers but does not completely block the water inlet 612a of the communication cavity 612 in the initial position, so that a narrow gap 301 is formed between the linkage valve 300 and the water inlet 612a (note that, the gap is not enough to make the water inlet 612a in an open state). When a water hammer occurs in the cold water mode, a small part of water flow in the water inlet cavity 611 of the hot water channel 610 of the communication valve 80 enters the communication cavity 612 from the gap 301, so that pressure relief of the water inlet cavity 611 is realized, and the pressure of the water inlet cavity 611 greater than that of the water outlet cavity 613 is reduced, so that the acting force of the water flow in the water inlet cavity 611 on the linkage valve 300 and pushing the linkage valve 300 towards the water outlet cavity 613 is basically equal to the acting force of the water flow in the water outlet cavity 613 on the linkage valve 300 and pushing the water inlet cavity 611, so that the water flow in the water inlet cavity 611 is limited to open the linkage valve 300, the linkage valve 300 is kept at the initial position, and the water leakage amount to the communication cavity 612 in the hot water pipe 50 is greatly reduced.

The small water amount is not enough to open the check valve 200, so that the water flow in the hot water pipe 50 does not flow to the cold water flow passage 120 through the check flow passage 130 in a large amount, and the water amount is much smaller than the flow rate of the hot water supply device 20 when being started, thereby solving the problem that the water flow in the hot water pipe 50 flows to the cold water flow passage 120 when the water hammer phenomenon occurs in a cold water mode, effectively reducing the situation that the hot water supply device 20 is started accidentally due to the increase of the flow rate of the hot water pipe 50, and realizing that the hot water supply device 20 is not started when the cold water is started.

Referring to fig. 11 and 13, when the water supply system uses the hot water mode, the pressure in the outlet chamber 613 of the hot water channel 610 in the communication valve 80 is decreased and decreased to be smaller than the pressure in the inlet chamber 611, so that the difference between the pressure in the inlet chamber 611 and the pressure in the outlet chamber 613 is increased, the water flow in the inlet chamber 611 opens the linkage valve 300, so that the linkage valve 300 moves to the open position, and the water flow in the hot water pipe 50 flows from the hot water channel 610 to the outlet chamber 613 through the inlet chamber 611, enters the water mixing device 30 from the hot water inlet 31 of the water mixing device 30, and is supplied to the water outlet 40 through the outlet of the water mixing device 30. The flow rate of the hot water pipe 50 is increased and the hot water supply device 20 is activated to prepare hot water. At this time, the check valve spool 210 of the check valve 200 is in the closed position under the tension of the return spring 220.

Referring to fig. 11 and 14, when the water supply system uses the zero-cooling mode, the circulating water pump 70 is turned on to push water to flow, so that the water pressure of the hot water pipe 50 rises, the pressure of the water inlet cavity 611 of the hot water channel 610 in the communication valve 80 increases, thereby pushing the linkage valve 300 to move upward, when the water supply system is stationary, the pressure of the water inlet cavity 611 and the water outlet cavity 613 of the communication valve 80 is leveled, at this time, the linkage valve 300 reaches an open position, the linkage valve 300 opens the water inlet 612a of the communication cavity 612, a large amount of water in the hot water pipe 50 enters the one-way flow channel 130, thereby overcoming the acting force of the return spring 220 to open the one-way valve 200, the water flows into the cold water flow channel 120 through the one-way flow channel 130, and then flows back to the hot water supply device 20 through the cold water pipe 60 from the cold water flow channel 120 for circular heating.

According to the technical scheme of the utility model, the linkage valve 300 is arranged in the hot water channel 610 of the communication valve 80, and the linkage valve 300 is suitable for switching between the initial position and the open position, wherein in the initial position, one end of the linkage valve 300 blocks the water outlet 612b of the communication cavity 612, and a gap 301 is formed between the other end of the linkage valve 300 and the water inlet 612a of the communication cavity 612, so that when a water hammer phenomenon occurs in a cold water mode, a small part of water flow in the water inlet cavity 611 of the hot water channel 610 in the communication valve 80 can be discharged to the communication cavity 612 of the hot water channel 610 through the gap 301, so that the pressure of the water inlet 611 is relieved, the linkage valve 300 is limited to be pushed open by the water flow in the water inlet 611, the linkage valve 300 is kept at the initial position, the water amount leaked to the communication cavity 612 in the hot water pipe 50 is greatly reduced, and the accidental starting of the hot water supply device 20 caused by the series flow of the hot water pipe 50 is ensured in the mode, the hot water supply device 20 is not activated when cold water is boiled (see above for details).

Therefore, the water supply system can solve the problem that the hot water supply device 20 is accidentally started due to the series flow of the water quantity of the hot water pipe 50 only by combining the existing water return valve 10 and the communication valve 80 on the original basis, and the hot water supply device 20 is not started when cold water is started without replacing or abandoning the existing water return valve 10 or changing the basic structure of the water return valve 10.

Referring to fig. 17, 19 and 20, in an embodiment, the linkage valve 300 includes a valve core seat 310 disposed in the water outlet cavity 613 for blocking the water outlet 612b of the communication cavity 612, and a valve core 320 disposed in the communication cavity 612 and linked with the valve core seat 310; in the initial position, the linkage valve 300 forms the gap 301 between the spool 320 and the water inlet 612a of the communication chamber 612.

Specifically, the valve core seat 310 and the valve core 320 of the linkage valve 300 are linked in the same direction. In the initial position, the linkage valve 300 blocks the water outlet 612b of the communication cavity 612 through the valve core seat 310, and a gap 301 is formed between the valve core 320 of the linkage valve 300 and the water inlet 612a of the communication cavity 612. When the linkage valve 300 moves upwards to the opening position under the action of the water pressure difference on the two sides, the valve core seat 310 of the linkage valve 300 opens the water outlet 612b of the communication cavity 612, and the valve core 320 of the linkage valve 300 opens the water inlet 612a of the communication cavity 612. And vice versa.

Referring to fig. 17, 19 and 20, there are many designs for the way of disposing the valve core seat 310 and the valve core 320 of the linkage valve 300 in a linkage manner. For example, in one embodiment, the linkage valve 300 further includes a connecting shaft 330, the connecting shaft 330 has an upper shaft section 331 connected to the valve core seat 310, and a lower shaft section 332 connected to the upper shaft section 331 and inserted into the water outlet cavity 613, and the valve core 320 is sleeved on the lower shaft section 332.

Specifically, the outer peripheral wall of the connecting shaft 330 is convexly provided with a support portion 333, the connecting shaft 330 is divided into an upper shaft section 331 and a lower shaft section 332 by the support portion 33, and opposite side surfaces of the support portion 333 are adapted to support the valve core seat 310 and the valve core 320, respectively. The lower shaft section 332 of the connecting shaft 330 penetrates the communicating chamber 612 from the upper shaft section 331 through the water outlet 612b, and is fixedly connected to the valve element 320. The valve cartridge seat 310 and the valve cartridge 320 are coupled together by a coupling shaft 330, so that the valve cartridge seat 310 and the valve cartridge 320 are interlocked. In addition, in other embodiments, a connecting portion may be protruded from one of the valve core seat 310 and the valve core 320 to the other, so that the two are connected together through the connecting portion to realize linkage.

Referring to fig. 17, 19 and 20, in an embodiment, in consideration of a possible structural design or assembly error of the communication valve 80 during a design process, a problem occurs in that after the linkage valve 300 is installed in the hot water passage 610 of the communication valve 80, a zero gap or an excessive gap occurs between the valve core 320 of the linkage valve 300 and the water inlet 612a of the communication cavity 612 of the hot water passage 610. To reduce this, the length of the valve core 320 sleeved on the lower shaft section 332 is optionally adjustable, so that the size of the gap 301 formed between the valve core 320 and the water inlet 612a of the communication cavity 612 is adjustable. Wherein, h in FIG. 18₁The length of the valve element 320 that is disposed on the lower shaft segment 332; h is₂Indicated by the size of the gap 301 between the valve spool 320 and the water inlet 612a of the communication chamber 612.

Specifically, the upper end of the valve element 320 is sleeved on the lower shaft section 332, and a gap 301 is formed between the lower end of the valve element 320 and the water inlet 612a of the communication cavity 612. Therefore, by adjusting the length of the valve element 320 sleeved on the upper end of the lower shaft section 332, the distance between the lower end of the valve element 320 and the water inlet 612a of the communication chamber 612 can be adjusted, so as to adjust the size of the gap 301 formed between the valve element 320 and the water inlet 612a of the communication chamber 612. For example, if the length of the valve element 320 sleeved on the upper end of the lower shaft section 332 is reduced, the lower end of the valve element 320 will approach the water inlet 612a of the communication chamber 612, so as to reduce the distance between the lower end of the valve element 320 and the water inlet 612a of the communication chamber 612, and reduce the gap 301 between the valve element 320 and the water inlet 612a of the communication chamber 612 (i.e. h₁Decrease, then h₂Also decreases). It should be noted that the size of the gap 301 refers to the width in the axial direction of the connecting shaft 330.

Referring to fig. 17, 19 and 20, as for the length of the valve element 320 sleeved on the lower shaft section 332 to be adjustable, various design manners are possible. In one embodiment, one end of the valve core 320 is provided with a sleeve hole 322 sleeved with the connecting shaft 330, and the other end is provided with an adjusting screw 323 communicated with the sleeve hole 322; the valve core 320 further comprises an adjusting screw 340, and the adjusting screw 340 is installed in the adjusting screw hole 323 and is in contact fit with the end face of the lower shaft section 332.

When the size of the gap 301 needs to be adjusted, the adjusting screw 340 is rotated, because the inner end surface of the adjusting screw 340 contacts and abuts against the end surface of the lower shaft section 332, the relative position of the adjusting screw 340 and the lower shaft section 332 is unchanged, and the valve core 320 in threaded fit with the adjusting screw 340 extends and retracts relative to the lower shaft section 332 along the axial direction thereof, so that the length of the valve core 320 sleeved on the lower shaft section 332 is changed, and the length of the valve core 320 sleeved on the lower shaft section 332 is adjustable.

As for the position of the gap 301 formed between the valve element 320 and the water inlet 612a of the communication chamber 612, optionally, an annular blocking portion 321 is protruded on the outer peripheral wall of one end of the valve element 320 far from the valve element seat 310, and in the initial position, the gap 301 is formed between the annular blocking portion 321 and the water inlet 612a of the communication chamber 612. It is understood that the valve body 320 covers but does not completely block the water inlet 612a of the communication chamber 612 by the annular blocking portion 321, so that a narrow gap 301 is formed between the annular blocking portion 321 and the water inlet 612 a.

Referring to fig. 17, fig. 19 and fig. 20, according to any of the above embodiments, the communication valve 80 further includes a resetting member 400, and the resetting member 400 is used for enabling the linkage valve 300 to have a tendency of resetting to the initial position. In this way, the reset piece 400 can drive the linkage valve 300 to reset to the initial position after the hot water in the water outlet device 40 is used or the hot water in the hot water pipe 50 is preheated. The restoring member 400 may also be a spring, a spring plate, or an extension spring.

Optionally, the reset element 400 is configured as a second spring 400, one end of the second spring 400 is fixed in the water outlet chamber 613, and the other end of the second spring 400 is connected to the linkage valve 300. The second spring 400 is used to force the linkage valve 300 core to have a tendency to return to the initial position. Therefore, on one hand, after the hot water of the water outlet device 40 is used or the hot water in the hot water pipe 50 is preheated, the linkage valve 300 can be driven by the second spring 400 to return to the initial position; on the other hand, the second spring 400 can also limit the linkage valve 300 at the initial position, so as to ensure the stability of the linkage valve 300 in use at the initial position.

Referring to fig. 12, 19 and 20, according to any of the above embodiments, the linkage valve 300 further includes a pressure relief member 350, the pressure relief member 350 has elasticity, and the pressure relief member 350 connects the valve core seat 310 and the upper shaft section 331. Therefore, when a water hammer phenomenon occurs when cold water is switched on and off, the pressure of the water inlet cavity 611 of the hot water of the communication valve 80 rises (rises by about 0.2-0.3 MPa), at this time, the pressure of the water inlet cavity 611 of the hot water channel 610 rises correspondingly, the pressure difference between the water inlet cavity 611 of the hot water channel 610 and the water outlet cavity 613 is greater than the force of the pressure relief piece 350 to push the valve core 320 of the linkage valve 300 to move slightly upwards, the valve core 320 drives the valve core seat 310 to abut against the pressure relief piece 350 through the connecting shaft 330, so that the tension (for example, about 0.1 MPa) of the pressure relief piece 350 is overcome to ensure that the pressure of the water outlet cavity 613 of the hot water channel 610 is not too large, meanwhile, a certain pressure difference is generated, the linkage valve 300 can be better maintained at an initial position and not opened when a cold water opening action is opened, and the linkage valve 300 can be easily opened after a subsequent working mode is switched.

Based on this, due to the existence of the pressure relief member 350, even if the cold water hammer occurs in the cold water mode switch, the water outlet cavity 613 of the hot water channel 610 can be timely relieved, and the pressure in the water outlet cavity 613 is not too large. Therefore, as shown in fig. 14, after the zero-cold-water mode is started, the circulating water pump 70 pushes water to flow, so that the pressure in the water inlet cavity 611 of the communication valve 80 is increased, the pressure generated by the circulating water pump 70 in the water inlet cavity 611 of the communication valve 80 can better offset the pressure difference, and further the linkage valve 300 is pushed to move upwards, so that the linkage valve 300 can be normally opened, and water circulation preheating is realized. Therefore, the situation that the linkage valve 300 is difficult to normally open due to the fact that the linkage valve 300 is locked at the initial position because the water outlet cavity 113 of the hot water flow channel 110 in the water return valve 10 keeps high pressure after the zero-cold-water mode is started can be effectively reduced.

Referring to fig. 19 and 20, for the specific structure of the pressure relief member 350, the pressure relief member 350 may also be an elastic structure such as a spring, a leaf spring or an extension spring. In the present embodiment, the pressure relief 350 is configured as a first spring 350. To improve the stability of the installation of the pressure relief member 350, optionally, the side of the valve core seat 310 facing the first spring 350 is provided with a first limiting groove 311; one end of the first spring 350 connected to the valve core seat 310 is installed in the first limiting groove 311. A second limit groove 334 is further arranged at one end, far away from the valve core 320, of the upper shaft section 331 of the connecting shaft 330; one end of the first spring 350 connected to the upper shaft section 331 is installed in the second limit groove 334.

Referring to fig. 19 and 20, in an embodiment, the linkage valve 300 further includes a gasket 360, and the gasket 360 is disposed on a lower surface of the valve core seat 310. Specifically, the lower surface of the valve core seat 310 is convexly provided with a mounting part around the periphery of the connecting shaft 330; the gasket 360 is fitted over the mounting portion 312. The gasket 360 may be made of a material having elasticity, such as rubber, so that the gasket 360 can be elastically deformed.

Referring to fig. 15 and 16, when the pressure of the water outlet chamber 613 of the hot water channel 610 of the communication valve 80 is higher than the pressure of the water inlet chamber 611 of the hot water channel 610, so that the linkage valve 300 is difficult to open normally, due to the existence of the sealing gasket 360, after the zero-cold-water mode is opened, the pressure of the water inlet chamber 611 of the hot water channel 610 of the communication valve 80 increases, and the linkage valve has a tendency of pushing the valve core 320 to move upward, at this time, the valve core 320 is pressed by the valve core seat 310 on the upper side, but the pressure of the water inlet chamber 611 of the hot water channel 610 increases due to water circulation, so that the pressure difference between the water inlet chamber 611 and the water outlet chamber 613 becomes small (generally, 0.05 to 0.08MPa can be reduced), and the valve core 320 moves upward slightly through the connecting shaft 330 during the pressure difference becomes small by a certain elastic deformation of the sealing gasket 360, but the valve core seat 310 is not enough to open the water outlet 612b of the communication chamber 612, and a larger opening gap 301 between the water inlet 612a reserved between the valve core 320 and the water inlet 612a forms a larger opening empty opening A slot 302. That is, the size of the opening gap 302 is the sum of the amount of micro-displacement that occurs in this case of the gap 301 and the spool 320. Therefore, in this case, even if the linkage valve 300 does not completely open the water inlet 612a of the communication cavity 612, the opening gap 302 can ensure that the circulation flow rate is about 4L/min, and the zero cold water use is met.

Referring to fig. 12, the present invention further provides a pressure valve assembly, which includes a water return valve 10 and the communication valve 80; the specific structure of the communication valve 80 refers to the above-described embodiment. Since the pressure valve assembly adopts all technical solutions of all the embodiments, all the advantages brought by the technical solutions of the embodiments are also achieved, and are not described in detail herein.

Alternatively, the water return valve 10 may be an H-type water return valve (as shown in fig. 12), or may be a water return valve of another shape (as shown in fig. 21 and 22). The water return valve 10 has a hot water flow passage 110, a cold water flow passage 120, and a one-way flow passage 130 for communicating the hot water flow passage 110 and the cold water flow passage 120; wherein the butt joint port 603 of the communication valve 80 is communicated with the inlet end of the one-way flow passage 130.

Specifically, the hot water flow passage 110 has a first connection port 101 and a second connection port 102, one of the first connection port 101 and the second connection port 102 is provided to be blocked, and the other is connected to the connection port 603 of the communication valve 80, so that the connection port 603 of the communication valve 80 is communicated with the inlet end of the one-way flow passage (130) thereof through the hot water flow passage 110 of the return valve 10. Optionally, the first connection 101 of the hot water channel 110 is connected to the connection 603 of the communication valve 80, and the second connection 102 of the hot water channel 110 is provided as a seal. The connection between the first port 101 of the hot water flow passage 110 and the docking port 603 of the communication valve 80 may be, but is not limited to: threads are arranged at the joint port 603 and the first joint 101 of the water return valve 10, so that the joint port 603 is in threaded connection with the first joint 101. In another embodiment, the second port 102 of the hot water flow path 110 may be connected to the butt port 603 of the communication valve 80, and the first port 101 of the hot water flow path 110 may be closed.

As for the blocking manner of the first connection 101 or the second connection 102 of the water return valve 10, various design manners are possible. For example, in an embodiment, the pressure valve assembly further comprises a cover 140, and the cover 140 is adapted to cover one of the first port 101 and the second port 102 of the water return valve 10 so as to connect the other with the docking port 603 of the communication valve 80.

Specifically, the cover 140 covers the second port 102 of the return valve 10, and the first port 101 of the return valve 10 is connected to the mating port 603 of the communication valve 80. In addition, in other embodiments, a plug may be disposed in the pressure valve assembly, and the plug may be used to plug the second port 102 of the water return valve 10, so that the second port 102 may also be plugged.

Referring to fig. 12, according to any of the above embodiments, the water return valve 10 further includes a water regulating valve 500, and the water regulating valve 500 is installed in the cold water flow passage 612 through an installation port to regulate the flow rate of water in the cold water flow passage 612. Optionally, the hot water flow path 110 of the water return valve 10 is a straight flow path, and/or the cold water flow path 120 of the water return valve 10 is a straight flow path, and/or the one-way flow path 130 of the water return valve 10 is a straight flow path.

The utility model also provides a water supply system. Referring to fig. 11 and 16, fig. 11 and 16 are schematic views of two embodiments of a water supply system. The water supply system includes a hot water supply device 20, a water mixing device 30, and a pressure valve assembly. Wherein, the hot water supply device 20 has a water inlet pipe 21 and a water outlet pipe 22; the hot water inlet end 31 of the water mixing device 30 is communicated with the water outlet pipe 22 through a hot water pipe 50, and the cold water inlet end 32 of the water mixing device 30 is communicated with the water inlet pipe 21 through a cold water pipe 60; the hot water passage 610 of the pressure valve assembly communicating with the valve 80 is connected to the hot water pipe 50, and the cold water passage 120 of the return valve 10 of the pressure valve assembly is connected to the cold water pipe 60, and the detailed structure of the pressure valve assembly refers to the above-described embodiment. Since the water supply system adopts all technical solutions of all the embodiments, all the beneficial effects brought by the technical solutions of the embodiments are also achieved, and are not described in detail herein.

It is worth mentioning that, the pressure-based valve assembly includes a water return valve 10 and a communication valve 80, and the water return valve 10 may be selected as an H-type water return valve, as shown in fig. 11; alternatively, the water return valve 10 may be a water return valve of another shape, as shown in FIG. 16. The water return valve 10 can be provided by the user or by the manufacturer. When the pressure valve assembly is assembled to a water supply system, the water inlet interface 601 of the communication valve 80 is communicated with the hot water supply device 20 through the hot water pipe 50, and the water outlet interface 602 of the communication valve 80 is communicated with the hot water inlet end 31 of the water mixing device 30; the third port 103 of the cold and hot valve 10 is connected to a cold water supply source (such as a tap water line) through the cold water pipe 60, and the fourth port 104 is connected to the cold water inlet 32 of the mixing device 30. In addition, the water supply system is provided with a circulating water pump 70, and the circulating water pump 70 is used for communicating the third interface 103 with the hot water supply device 20 and sucking cold water. The circulation water pump 70 may be provided on a line between the heat exchanger of the hot water supply device 20 and the cold water pipe 60. Specifically, the circulation water pump 70 is provided on the inlet pipe 21 of the hot water supply device 20.

The water supply system is provided with the pressure valve assembly, so that the water supply system at least has three working modes, namely a cold water mode, a hot water mode and a zero cold water mode, which are described in detail below.

Referring to fig. 11 and 12, when the water supply system uses the cold water mode, the linkage valve 300 is in an initial position; at this time, the pressure of the cold water flow passage 120 of the water return valve 10 is reduced, and the water flow of the cold water pipe 60 flows from the cold water flow passage 120 to the cold water inlet 32 of the water mixing device 30, and then is supplied to the water outlet device 40 through the outlet of the water mixing device 30. At this time, the check valve spool 210 of the check valve 200 is in the closed position under the tension of the return spring 220.

Optionally, the water supply system further comprises a water outlet device 40, and the water outlet device 40 is connected with the output end 33 of the water mixing device 30. The number of the water outlet means 40 may be one or two or more. When the number of the water outlet apparatuses 40 is two or more, a pressure valve assembly may be provided for each water outlet apparatus 40, or a pressure valve assembly may be provided only for the water outlet apparatus 40 disposed at the farthest end. Of course, in other embodiments, the water outlet device 40 may be provided by the user.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims

1. A water return valve, comprising:

the valve body is provided with a hot water flow passage, a cold water flow passage and a one-way flow passage; the hot water flow passage comprises a water inlet cavity, a communication cavity and a water outlet cavity, wherein the communication cavity is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity; the one-way flow passage is used for communicating the communication cavity with the cold water flow passage; and

the linkage valve is arranged in the hot water flow channel and is suitable for switching between an initial position and an opening position; wherein:

at the initial position, one end of the linkage valve blocks the water outlet, and a gap is formed between the other end of the linkage valve and the water inlet;

in the open position, the linkage valve opens both the water inlet and the water outlet.

2. The water return valve of claim 1 wherein said linkage valve comprises:

the valve core seat is arranged in the water outlet cavity and used for plugging the water outlet; and

and the valve core is arranged in the communicating cavity and is linked with the valve core seat, and the valve core blocks the water inlet at the initial position.

3. The water return valve according to claim 2, wherein the linkage valve further comprises a connecting shaft, the connecting shaft has an upper shaft section connected with the valve core seat and a lower shaft section connected with the upper shaft section and inserted into the water outlet cavity, and the valve core is sleeved on the lower shaft section.

4. The water return valve according to claim 3 wherein the length of the spool fitted over the lower shaft section is adjustable so that the size of a gap formed between the spool and the water inlet is adjustable.

5. The water return valve according to claim 4, wherein one end of the valve core is provided with a sleeve hole sleeved with the connecting shaft, and the other end of the valve core is provided with an adjusting screw hole communicated with the sleeve hole;

the linkage valve further comprises an adjusting screw, and the adjusting screw is installed in the adjusting screw hole and is in contact fit with the end face of the connecting shaft.

6. The water return valve according to claim 3, wherein said linkage valve further comprises a pressure relief member, said pressure relief member has elasticity, and said pressure relief member connects said valve core seat and an upper shaft section of said connecting shaft.

7. The water return valve according to claim 6 wherein the pressure relief member is configured as a first spring, one end of the first spring being connected to the valve core housing, the other end of the first spring being connected to an end of the upper shaft section remote from the upper shaft section.

8. The water return valve according to claim 7, wherein a side of the valve core seat facing away from the valve core is provided with a first limiting groove; one end of the first spring connected with the valve core seat is arranged in the first limiting groove.

9. The water return valve according to claim 7, wherein one end of the upper shaft section of the connecting shaft, which is away from the valve element, is provided with a second limiting groove; one end of the first spring connected with the upper shaft section is installed in the second limiting groove.

10. The water return valve according to any one of claims 2 to 9 wherein an annular blocking portion is provided to protrude from an outer peripheral wall of an end of the valve element remote from the valve element seat, and in the initial position, the gap is formed between the annular blocking portion of the valve element and the water inlet.

11. The water return valve according to any one of claims 2 to 9, characterized in that said linkage valve further comprises a gasket, said gasket being disposed on the lower surface of said valve core seat.

12. The water return valve according to any one of claims 3 to 9 wherein a support portion is provided convexly on an outer peripheral wall of the connecting shaft, the support portion dividing the connecting shaft into an upper shaft section and a lower shaft section, opposite side surfaces of the support portion being adapted to support the valve core seat and the valve core, respectively.

13. The water return valve according to any one of claims 1 to 9 further comprising a reset element for causing said linkage valve to have a tendency to reset to said initial position.

14. The water return valve according to any one of claims 1 through 9, further comprising a check valve provided in the check passage for guiding water of the hot water passage to flow in one direction toward the cold water passage upon return of water.

15. A water supply system, characterized in that the water supply system comprises:

a hot water supply device having a hot water outlet;

the hot water inlet end of the water mixing device is communicated with the hot water outlet through a hot water pipe, and the cold water inlet end of the water mixing device is communicated with a cold water source through a cold water pipe; and

the water return valve according to any one of claims 1 to 14, wherein a hot water flow passage of the water return valve is connected to the hot water pipe, and a cold water flow passage of the water return valve is connected to the cold water pipe.

16. The water supply system of claim 15, wherein the hot water supply device is a gas water heater or a gas wall-hanging stove or an electric water heater.

17. A communication valve, comprising:

the valve body is provided with a hot water channel; the hot water channel comprises a water inlet cavity, a communication cavity and a water outlet cavity, wherein the communication cavity is provided with a water inlet communicated with the water inlet cavity and a water outlet communicated with the water outlet cavity; the communication cavity is also provided with a butt joint port which is suitable for being communicated with the inlet end of the one-way flow passage of the water return valve so as to be communicated with the cold water flow passage of the water return valve through the one-way flow passage; and

the linkage valve is arranged in the hot water channel and is suitable for switching between an initial position and an opening position; wherein:

18. The communication valve of claim 17, wherein the linkage valve comprises:

and the valve core is arranged in the communicating cavity and is linked with the valve core seat, and the linkage valve forms the gap between the valve core and the water inlet at the initial position.

19. The communication valve of claim 18, wherein the linkage valve further comprises a connecting shaft, the connecting shaft has an upper shaft section connected with the valve core seat and a lower shaft section connected with the upper shaft section and inserted into the water outlet cavity, and the valve core is sleeved on the lower shaft section.

20. The communication valve of claim 19, wherein the spool is adjustably sleeved on the lower shaft section to provide an adjustable size of a gap formed between the spool and the water inlet.

21. The communication valve according to claim 20, wherein a sleeve hole sleeved with the connecting shaft is formed through one end of the valve core, and an adjusting screw hole communicated with the sleeve hole is formed at the other end of the valve core;

22. The communication valve of claim 19, wherein the linkage valve further comprises a pressure relief member, the pressure relief member having elasticity, the pressure relief member connecting the valve core seat and the upper shaft section of the connecting shaft.

23. A communication valve according to any of claims 18 to 22, wherein the linkage valve further comprises a gasket disposed on a lower surface of the cartridge seat.

24. The communication valve of any one of claims 18 to 22, further comprising a reset for biasing the linkage valve to the initial position.

25. A pressure valve assembly, characterized in that the pressure valve assembly comprises:

a water return valve; and

the communication valve of any one of claims 17 to 24;

the water return valve is provided with a hot water flow channel, a cold water flow channel and a one-way flow channel for communicating the hot water flow channel with the cold water flow channel;

wherein, the butt joint mouth of the communicating valve is communicated with the inlet end of the one-way flow passage.

26. A pressure valve assembly as claimed in claim 25, wherein the hot water flow path of the return valve has a first and second port, one of which is arranged to be blocked and the other of which is connected to the docking port of the communication valve to communicate the docking port with the inlet end of the one-way flow path.

27. The pressure valve assembly as recited in claim 26 further comprising a cover adapted to cover one of the first and second ports of the return valve to connect the other port with the docking port of the communication valve.

28. A water supply system, characterized in that the water supply system comprises:

a hot water supply device having a water inlet pipe and a water outlet pipe;

the hot water access end of the water mixing device is communicated with the water outlet pipe through a hot water pipe, and the cold water access end of the water mixing device is communicated with the water inlet pipe through a cold water pipe; and

a pressure valve assembly as claimed in claim 25 or 26, in which the hot water passage communicating with the valve is connected to the hot water pipe and the cold water passage of the return valve is connected to the cold water pipe.