CN209819893U - Thermostat and intelligent water heater - Google Patents

Abstract

The utility model relates to a thermostat and intelligent water heater belongs to water heater technical field. The thermostat includes: a water storage tank and a control circuit. Wherein, the water storage tank is externally provided with a water inlet pipe and a water outlet pipe which are communicated with each other, the water storage tank is internally provided with a backflow pipe and an electric heater, the backflow pipe is communicated with the water outlet pipe, the backflow pipe is provided with a water inlet hole, the water inlet pipe is used for being connected with a water outlet port of the gas water heater, the water outlet pipe is used for being connected with a hot water valve of the gas water heater, and the electric heater is used for heating the water body in the. The control circuit is electrically connected with the electric heater and used for controlling the on-off of the electric heater. The thermostat is additionally arranged between the water outlet end of the existing gas water heater and the hot water valve, hot water in the thermostat is utilized to carry out heat exchange on hot water or cold water flowing out of the gas water heater, when the hot water valve is opened, hot water in the thermostat flows out, and stable hot water can always flow out after the water heater is opened at any time.

Description

Thermostat and intelligent water heater

Technical Field

The utility model belongs to the technical field of the water heater, concretely relates to thermostat and intelligent water heater.

Background

When the gas water heater provided in the market is used, cold water is totally filled from a hot water valve to the whole water heater pipeline, the hot water valve is opened, water starts to flow, and the gas water heater starts to work. In the design of a manufacturer, firstly, the forced draft fan is started to clean the flue for about 3-5 seconds, the air pressure switch is closed only when the fact that the flue is not blocked is confirmed, then ignition is started, and hot water at normal temperature can be discharged after 3-5 seconds of operation of the gas water heater. Is characterized in that only a small amount of hot water is needed when washing face and brushing teeth in the morning, and consequently, a large amount of cold water is discharged to obtain hot water, which not only wastes water, but also wastes time and can not satisfy the fast-paced life of urban people.

In addition, the gas water heaters consume large gas and water, the heat load of a 10-liter gas water heater is 20KW, the heat load of a 12-liter gas water heater is 24KW, the heat load of a common gas stove is only 3.8KW, the gas water heater is often suspended in the process of using hot water due to the consideration of water and gas conservation, such as hair washing or bath, when the suspended gas water heater is restarted, first, a section of hot water is discharged, then, a section of cold water is discharged, and finally, the hot water with stable temperature is discharged, so that the water temperature cannot be constant, and inconvenience is brought to the use of people.

SUMMERY OF THE UTILITY MODEL

In view of this, the embodiment of the utility model provides a thermostat and intelligent water heater is provided to improve the technical problem that current gas heater can not supply water with constant temperature.

The embodiment of the utility model is realized like this:

in a first aspect, an embodiment of the present invention provides a thermostat, including: the water storage tank is externally provided with a water inlet pipe and a water outlet pipe which are communicated with the water storage tank, a backflow pipe and an electric heater are arranged in the water storage tank, the backflow pipe is communicated with the water outlet pipe, the backflow pipe is provided with a water inlet hole, the water inlet pipe is used for being connected with a water outlet port of a gas water heater, the water outlet pipe is used for being connected with a hot water valve of the gas water heater, and the electric heater is used for heating water in the water storage tank; and the control circuit is electrically connected with the electric heater and is used for controlling the on-off of the electric heater. In the embodiment of the application, a thermostat is additionally arranged between the water outlet end of the existing gas water heater and the hot water valve, hot water or cold water flowing out of the gas water heater is subjected to heat exchange by utilizing hot water stored in the thermostat, and when the hot water valve is opened, hot water in the thermostat flows out, so that stable hot water can always flow out after the water heater is opened at any time. Meanwhile, hot water flowing out of the water outlet pipe slowly permeates through the water inlet hole, so that cold water or hot water flowing out of the gas water heater can be mixed with hot water in the water storage tank and then flows out of the water storage tank conveniently, and the consistency of the temperature of the hot water is ensured.

With reference to a possible implementation manner of the embodiment of the first aspect, the water outlet pipe is disposed at the bottom of the water storage tank, the bottom end of the return pipe is connected to the water outlet pipe, the top end of the return pipe is located at the middle upper portion of the water storage tank, and the water inlet hole is disposed at the middle lower portion of the return pipe. In the embodiment of the application, because the water temperature in the jar body is all inconsistent from top to bottom, whole temperature is the state of going up low from top to bottom, adopts the mode that sets up the inlet opening in the well lower part of back flow for the hot water of flowing through the hot water valve is partly to be taken from jar body bottom, and partly middle part of taking from jar body, and then makes the hot water that flows through the outlet pipe just flow out after a lot of heat transfer, has further guaranteed hot water temperature's unanimity.

In combination with one possible implementation manner of the embodiment of the first aspect, the return pipe includes a return inner pipe and a return outer pipe; the backflow inner tube is located in the backflow outer tube, the bottom end of the backflow inner tube is communicated with the water outlet tube, the water inlet hole is formed in the backflow outer tube, the length of the backflow inner tube is smaller than that of the backflow outer tube, and the backflow inner tube is located on the middle upper portion of the water storage tank. In the embodiment of the application, the mode of inside and outside back flow is adopted to increase heat transfer times, can intensive mixing with the hot water in guaranteeing cold water or boiling hot water that gas heater flowed out and the water storage tank, make the hot water temperature of outflow invariable.

With reference to one possible implementation manner of the embodiment of the first aspect, the control circuit includes: the first end of the first switch tube is connected with the first end of the second switch tube, the first end of the first switch tube is connected with the second end of the first switch tube, the first end of the first switch tube is connected with a power supply, the third end of the first switch tube is connected with the second end of the second switch tube, the third end of the second switch tube is connected with the electric heater, the second end of the first switch tube is connected with one end of the flow sensing switch, the other end of the flow sensing switch is grounded, the flow sensing switch is arranged on the water outlet pipe, when the hot water valve is opened, the flow sensing switch is closed, and the electric heater is in a power-off state. In the embodiment of this application, through set up the flow inductive switch who is used for monitoring gas heater on the outlet pipe to when there is the water demand, the electricity of disconnection electric heater no longer heats the water in the thermostat this moment, with the assurance power consumption safety, guarantees simultaneously that the temperature of whole water storage tank only depends on the leaving water temperature that hot gas water heater set for, so that the invariant of temperature.

With reference to one possible implementation manner of the embodiment of the first aspect, the control circuit further includes: the water heater comprises a first temperature control switch, a second temperature control switch and a boat-shaped switch, wherein the first temperature control switch is connected with the second temperature control switch in parallel, one end of the second temperature control switch is connected with the third end of a second switch tube, the other end of the second temperature control switch is connected with the boat-shaped switch in series and then is connected with the electric heater, when the temperature of water in the water storage tank is lower than a preset first threshold value of the first temperature control switch, the first temperature control switch is closed, and when the temperature of water in the water storage tank is higher than a preset second threshold value of the first temperature control switch, the first temperature control switch is disconnected; when the water temperature in the water storage tank is lower than a preset third threshold value of the second temperature control switch, the second temperature control switch is turned on, and when the water temperature in the water storage tank is higher than a preset fourth threshold value of the second temperature control switch, the second temperature control switch is turned off, wherein the second threshold value is higher than the first threshold value, the fourth threshold value is higher than the third threshold value, and the fourth threshold value is higher than the second threshold value. In the embodiment of the application, the first temperature control switch is connected with the second temperature control switch and the boat-shaped switch in parallel after being connected in series, so that the thermostat can adapt to the change of seasons and the working mode of the corresponding switching control circuit, and the applicability and the comfort are improved.

With reference to one possible implementation manner of the embodiment of the first aspect, the control circuit further includes: and one end of the third temperature control switch is connected with the third end of the second switch tube, the other end of the third temperature control switch is connected with one end of the second temperature control switch, and when the water temperature in the water storage tank is higher than a preset fifth threshold value of the third temperature control switch, the third temperature control switch is switched off, wherein the fifth threshold value is higher than the fourth threshold value. In the embodiment of the application, the third temperature control switch is arranged to prevent the first temperature control switch or the second temperature control switch from being in fault, and if the fault exceeds the self-set threshold value, the first temperature control switch or the second temperature control switch is still in a closed state, so that the water temperature is too high.

With reference to a possible implementation manner of the embodiment of the first aspect, a drainage tube is further disposed in the water storage tank, a bottom end of the drainage tube is communicated with the water inlet tube, a top end of the drainage tube is located at a middle upper portion of the water storage tank, and a water permeable hole is formed in the drainage tube. In the embodiment of the application, set up the drainage tube in the hole of permeating water through setting up with the inlet tube intercommunication to further increase the cold water that gas heater flows out or scald the hydrothermal heat exchange number of times in water and the thermostat.

With reference to a possible implementation manner of the embodiment of the first aspect, the water inlet pipe is connected to the water outlet port of the gas water heater through a high-pressure hose, and a safety check valve is disposed at the water inlet pipe. In this application embodiment, through set up safe check valve on the inlet tube, avoid the water among the thermostat to flow back to in the gas water heater.

With reference to a possible implementation manner of the embodiment of the first aspect, the thermostat further includes an outer shell, and an insulating layer is filled between the water storage tank and the outer shell. In the embodiment of the application, avoid the user to be scalded through setting up the shell, simultaneously, the heat preservation can slow down the cooling rate ℃ of the water in the water storage tank, and then reduces the length of time and the number of times that electric heater carries out the heating to this hot water to practice thrift electric energy and time.

In a second aspect, the present invention further provides an intelligent water heater, including a housing, a gas heating device disposed in the housing, a thermostat provided in the above first aspect embodiment and/or in combination with any one of the possible implementations of the first aspect embodiment, and a cold water valve and a hot water valve disposed outside the housing; the water inlet port of the gas heating device is connected with the cold water valve, the water outlet port of the gas heating device is connected with the water inlet pipe of the thermostat, and the water outlet pipe of the thermostat is connected with the hot water valve. In the embodiment of the application, through being integrated as an organic whole with gas heater and thermostat, circuit line and some spare parts can unify like this and consider together, can reduce cost for compact structure, the appearance is pleasing to the eye, can also reduce simultaneously and occupy the volume.

Additional features and advantages of the invention will be set forth in the description which follows, and in part will be obvious from the description, or may be learned by practice of the embodiments of the invention. The objectives and other advantages of the invention will be realized and attained by the structure particularly pointed out in the written description and drawings.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required to be used in the embodiments will be briefly described below, and 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 these drawings without creative efforts. The above and other objects, features and advantages of the present invention will become more apparent from the accompanying drawings. Like reference numerals refer to like parts throughout the drawings. The drawings are not intended to be drawn to scale in actual dimensions, emphasis instead being placed upon illustrating the principles of the invention.

Fig. 1 shows a schematic structural diagram of a thermostat provided by an embodiment of the present invention.

Fig. 2 is a schematic cross-sectional view of a thermostat according to an embodiment of the present invention.

Fig. 3 is a schematic cross-sectional view of another thermostat provided by an embodiment of the present invention.

Fig. 4 shows a schematic diagram of a control circuit according to an embodiment of the present invention.

Fig. 5 shows a schematic diagram of a control circuit according to an embodiment of the present invention.

Fig. 6 shows a schematic diagram of a control circuit according to an embodiment of the present invention.

Fig. 7 shows a schematic structural diagram of an intelligent water heater provided by an embodiment of the present invention.

Icon: 100-a thermostat; 10-a water storage tank; 101-a water inlet pipe; 102-a water outlet pipe; 103-a return pipe; 1031-reflux outer tube; 1032-reflux inner tube; 104-water inlet hole; 105-a drainage tube; 106-water permeable pores; 107-safety check valve; 108-an electric heater; 20-a circuit board; 21-a flow sensing switch; 30-a housing; 40-an insulating layer; 200-intelligent water heater; 210-a condensing heat exchanger; 220-a sensible heat exchanger; 230-a burner; 240-a fan; 250-a condensate recovery device.

Detailed Description

The technical solutions in the embodiments of the present invention will be described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention.

It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.

In the description of the present invention, it should be noted that the terms "upper", "lower", "inner", "outer", and the like indicate the position or positional relationship based on the position or positional relationship shown in the drawings, or the position or positional relationship that the products of the present invention are conventionally placed when used, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element to which the reference is made must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," and "connected" are to be construed broadly, e.g., as meaning fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment of the application provides a thermostat in order to solve current gas heater and can not realize opening instant heating promptly, extravagant water resource, has the problem that can not supply water with constant temperature in the use. The thermostat is additionally arranged between the water outlet end of the existing gas water heater and the hot water valve, the water outlet end of the gas water heater is not directly connected with the hot water valve, namely the water outlet end of the existing gas water heater is communicated with the water inlet end of the thermostat, the water outlet end of the thermostat is communicated with the hot water valve, hot water or cold water flowing out of the gas water heater is neutralized by utilizing constant-temperature water stored in the thermostat, when the hot water valve is opened, hot water in the thermostat flows out, stable hot water can be ensured to always flow out after the water heater is opened at any time, and the problems are solved.

For ease of understanding, the structure and principles of the thermostat will be described below. As shown in fig. 1 and 2, the thermostat 100 includes: a water storage tank 10 and a circuit board 20. The circuit board 20 has a control circuit integrated thereon.

The water storage tank 10 is externally provided with a water inlet pipe 101 and a water outlet pipe 102 which are communicated with the water storage tank 10, so that a water outlet port of the gas water heater is communicated with the water inlet pipe 101, the water outlet pipe 102 is communicated with a hot water valve of the gas water heater, water entering the thermostat 100 is heated by the gas water heater and then mixed with hot water in the water storage tank 10 to flow out, and stable hot water can flow out all the time after the water heater is opened. The water storage capacity of the water storage tank 10 can be set according to the requirement, and is not suitable to be too small or too large during setting, the too small results in poor temperature constant temperature capability, the too large results in increased occupied volume and accelerated heat loss, and for example, the capacity can be set to be 3-8L, such as 4L. The shape of the water storage tank 10 may be various, for example, it may be cylindrical, rectangular, or other shapes, and the material may be stainless steel or other materials that are not easily deformed.

When the water inlet pipe 101 is connected to the water outlet of the gas water heater, as an embodiment, the water inlet pipe may be connected through an explosion-proof high-pressure hose to reduce the risk of water leakage, to prevent hot water from flowing back to the gas water heater, to reduce heat loss, and to prevent the water pressure in the water storage tank 10 from being too high to affect the service life thereof, and to prevent the tank from bursting or other components from being damaged due to overpressure, the water inlet pipe 101 of the water storage tank 10 may further be provided with a safety check valve 107, for example, a brass safety check valve.

As an embodiment, the water inlet pipe 101 and the water outlet pipe 102 may be both disposed at the bottom of the water storage tank 10, but it should be understood that other disposing manners are also possible, for example, both disposed at a side wall of the water storage tank 10, for example, the water inlet pipe 101 may be disposed at the top of the water storage tank 10, the water outlet pipe 102 may be disposed at the bottom or the side wall of the water storage tank 10, for example, the water inlet pipe 101 may be disposed at a side wall of the water storage tank 10, the water outlet pipe 102 may be disposed at the bottom of the water storage tank 10, and the like, which is not further limited herein.

A return pipe 103 and an electric heater 108 are arranged in the water storage tank 10. The return pipe 103 is communicated with the water outlet pipe 102, and the return pipe 103 is provided with a water inlet hole 104, so that cold water or hot water flowing out of the gas water heater is fully mixed with hot water in the water storage tank 10, and water flowing into the thermostat 100 from the gas water heater flows out after multiple heat transfers in the water storage tank 10. Since the water flow starts to flow when the gas water heater just starts to operate, cold water and then hot water flow through the water storage tank 10, when the gas water heater is started again after being temporarily suspended, hot water which is not cooled yet flows through the water storage tank 10 and then hot water with higher temperature in the water storage component of the gas water heater. The water inlet hole 104 is arranged so that when a user needs hot water, water flow starts to flow, water in the water storage tank 10 enters the return pipe 103 through the water inlet hole 104 and then flows out through the water outlet pipe 102, and the water in the water storage tank 10 does not directly flow out through the water outlet pipe 102 but slowly enters the return pipe 103 through the water inlet hole 104 and then flows out through the water outlet pipe 102, so that cold water or hot water flowing out of the gas water heater and the hot water in the water storage tank 10 are fully mixed and then flow out. In other words, if the return pipe 103 is not provided, the water in the water storage tank 10 flows out and then the mixed water flows out, which may cause temperature instability.

Wherein, the inlet opening 104 is located in the middle-lower part of the return pipe 103, because the water temperature in the tank body is not uniform from top to bottom, the whole water temperature is in a state of high top to low bottom, a part of hot water flowing through the hot water valve is taken from the bottom of the tank body, and a part of hot water is taken from the middle part of the tank body, namely the water flow entering the thermostat 100 from the gas water heater flows out after multiple heat transfer in the water storage tank 10, thus ensuring the consistency of the hot water temperature. The size of the water inlet 104 depends on the diameter of the return pipe 103, the water inlet 104 is not too small, the too small size affects the size of the outlet water, and the diameter of the outlet water can be 3mm to 8mm, for example, 5 mm.

As an embodiment, when the water outlet pipe 102 is disposed at the bottom of the water storage tank 10, the bottom end of the return pipe 103 is connected to the water outlet pipe 102, the top end of the return pipe 103 is located at the middle upper portion of the water storage tank 10, and the water inlet hole 104 is disposed at the middle lower portion of the return pipe 103, so that the cold water or the hot water flowing out of the gas water heater can be mixed with the hot water in the water storage tank 10 more fully. Optionally, the top end of the return pipe 103 may be abutted against the top end of the tank, so that the sealing welding treatment of the return pipe 103 is not required, and of course, the return pipe may be suspended and not abutted against the top end of the tank. Of course, the top end of the return pipe 103 may be located at the middle lower part of the water storage tank 10, for example, when the outlet pipe 102 is located at the middle upper part of the tank body, one end of the return pipe 103 is connected to the outlet pipe 102, and the other end is located at the middle lower part of the water storage tank 10.

When the outlet pipe 102 is disposed at the bottom of the water storage tank 10, the return pipe 103 includes a return inner pipe 1032 and a return outer pipe 1031, as an embodiment. The internal reflux pipe 1032 is located in the external reflux pipe 1031, the bottom end of the internal reflux pipe 1032 is communicated with the water outlet pipe 102, and the internal reflux pipe 1032 is located at the middle upper part of the water storage tank 10. On backward flow outer tube 1031 cover was located backward flow inner tube 1032, the bottom of backward flow outer tube 1031 and the bottom butt of the jar body, the top of backward flow outer tube 1031 is located the well upper portion of the jar body, if with the top butt of the jar body, just so need not carry out sealing welding to back flow 103 outer tube and handle, form mechanical basis between backward flow outer tube 1031 and the top, have certain clearance between the two, when being convenient for just install, get rid of the air in the water storage tank 10. The return outer tube 1031 is provided with the water inlet hole 104, the length of the return inner tube 1032 is smaller than that of the return outer tube 1031, and the return outer tube 1031 and the bottom of the return inner tube 1032 are separated by a rubber sleeve (such as a rubber tube). For example, a tube with a diameter of 16mm is used as the return outer tube 1031, a tube with a diameter of 10mm is used as the return inner tube 1032, and water inlet holes 104 are respectively opened at the middle part and the lower part of the return outer tube 1031, for example, 2 water inlet holes 104 are respectively opened at each position, for a total of 4 water inlet holes 104. When a user opens the hot water valve, as the water temperature in the tank body is not uniform from top to bottom, the whole water temperature is in a state of high top and low bottom, one part of hot water flowing through the hot water valve is taken from the bottom of the tank body, and the other part of the hot water is taken from the middle of the tank body, namely, the water flow entering the thermostat 100 from the gas water heater flows out after multiple heat transfers in the water storage tank 10, so that the consistency of the hot water temperature is ensured.

The electric heater 108 is used for heating the water in the tank body under the control of the control circuit, and the electric heater 108 can be a rectangular heating pipe or a single-end heating pipe. The single-head heating pipe is fixed at the bottom of the water storage tank 10, the design and manufacture of the single-head heating pipe tank body are more convenient, and the heating pipe is damaged and is convenient to replace. The power of the electric heater 108 is 1000W, and the electric heater can be directly used by a household plug of a common user. Of course, a higher power electric heater 108 may be used, for example, if a power of 1500W or more is used, a dedicated socket of 16A or more is required to be specially installed.

As another embodiment, as shown in fig. 3, the thermostat 100 further includes a housing 30, and an insulation layer 40 is filled between the water storage tank 10 and the housing 30 to enhance the insulation effect of the water storage tank 10. The insulating layer 40 may be made of high-density polyurethane insulating material. The shell 30 can insulate heat to prevent people from being scalded.

In one embodiment, a drainage tube 105 is further disposed in the water storage tank 10. The bottom end of the drainage tube 105 is communicated with the water inlet pipe 101, the top end of the drainage tube 105 is positioned at the middle upper part of the water storage tank 10, and the drainage tube 105 is provided with a water permeable hole 106. Optionally, the upper part, the middle part and the lower part of the drainage tube 105 are respectively provided with a water permeable hole 106, the upper part of the drainage tube 105 is located at the top of the water storage tank 10 and is in mechanical contact with the top sealing cover of the water storage tank 10, the drainage tube 105 extends into the top of the tank body and is in contact with the top sealing cover of the tank body, the top port of the drainage tube 105 does not need to be subjected to sealing welding treatment, and the processing trouble is avoided. Wherein, the aperture of the hole 106 of permeating water will be moderate, too little can not satisfy the flow requirement, too big rivers can not evenly permeate through in the hole 106 of permeating water infiltration water storage tank 10, set up drainage tube 105 and can play good drainage effect, guarantee the homogeneity of the inside fluid temperature of water storage tank 10, for example, 2 holes 106 of permeating water that the diameter is 4mm have been seted up respectively at every position about drainage tube 105, total 6 holes. In one mode, the drainage tube 105 is made of a stainless steel tube with the outer diameter of 10mm, and then the drainage tube is sleeved on an outer thread port of the water inlet tube 101 with the diameter of 20mm through a rubber tube, and the diameter of the drainage tube 105 is consistent with that of the explosion-proof hose, so that materials can be saved.

The circuit board 20 is disposed on the water storage tank 10, for example, at the top of the water storage tank 10. Integrated on the circuit board 20 is a control circuit for controlling the electrical on/off of the electric heater 108. The control circuit is electrically connected with the electric heater 108 and is used for controlling the on-off of the electric heater 108, when the electric heater 108 is electrified, the control circuit works to heat water in the tank body, and when the electric heater 108 is powered off, the control circuit stops heating. As an embodiment, a schematic circuit diagram of the control circuit is shown in fig. 4, and the control circuit includes: transformer T, rectifier bridge (composed of D1, D2, D3 and D4), power switch S1 and power relay JK, where power switch S1 is connected to the live wire in the line, and when power switch S1 is closed, the coil of power relay JK is energized, the normally open contact JK1 of power relay JK is closed, and electric heater 108 is energized.

As another embodiment, a schematic circuit diagram of the control circuit is shown in fig. 5, and includes: a flow sensing switch 21, a first switch tube Q1 and a second switch tube Q2, wherein a first end (collector) of the first switch tube Q1 is connected to a first end (collector) of the second switch tube Q2, the first end (collector) of the first switch tube Q1 is further connected to a second end (base) thereof, the first end (collector) of the first switch tube Q1 is further used for being connected to a power source (i.e. a live line L), the third end (emitter) of the first switch tube Q1 is connected to the second end (base) of the second switch tube Q2, the third end (emitter) of the second switch tube Q2 is connected to the electric heater 108, the second end (base) of the first switch tube Q1 is further connected to one end of the sensing flow switch 21, the other end of the flow sensing switch 21 is grounded (i.e. connected to a neutral line N), the flow sensing switch 21 is disposed on the water outlet pipe 102, when the hot water valve is opened, the flow sensing switch 21 is closed and the electric heater 108 is in a power-off state. That is, at this time, the flow sensing switch 21 is disposed on the water outlet pipe 102, and is used for detecting the operating state of the gas water heater, the hot water valve is opened, the flow sensing switch 21 is closed, the hot water valve is closed, the flow sensing switch 21 is opened, to ensure that the water storage tank 10 only works when the gas water heater is not used (the hot water valve is closed), and when the hot water valve is opened, the flow induction switch 21 is in a closed state, the base point of the Q1 is 0, the Q1 and the Q2 are all cut off, no power is transmitted to a coil JK-W of the power relay JK, the TH is not powered off and does not work, the water in the water storage tank 10 cannot be heated, the water temperature of the whole water storage tank 10 is only determined by the outlet water temperature set by the gas water heater, further, the effects of leakage protection, grounding protection and power-off protection are achieved, and multiple safety protection measures such as overpressure protection and electric heating dry burning prevention protection are performed by the safety check valve 107 installed on the water inlet pipe 101.

As still another embodiment, as shown in fig. 6, the control circuit further includes: a first temperature controlled switch KD1, a second temperature controlled switch KD2 and a navigator switch S2. The first temperature control switch KD1 is connected in parallel with the second temperature control switch KD2, one end of the second temperature control switch KD2 is connected with a third end (an emitter) of the second switch tube Q2, the other end of the second temperature control switch KD2 is connected in series with the navicular switch S2 and then connected with the electric heater 108, when the temperature of water in the water storage tank 10 is lower than a preset first threshold value (for example, 43 ℃) of the first temperature control switch KD1, the first temperature control switch KD1 is closed, and when the temperature of water in the water storage tank 10 is higher than a preset second threshold value (for example, 45 ℃) of the first temperature control switch KD1, the first temperature control switch KD1 is opened; when the temperature of the water in the water storage tank 10 is lower than a preset third threshold (for example, 48 ℃) of the second temperature control switch KD2, the second temperature control switch KD2 is closed, and when the temperature of the water in the water storage tank 10 is higher than a preset fourth threshold (for example, 50 ℃) of the second temperature control switch KD2, the second temperature control switch KD2 is opened. The circuit enables KD1 and KD2 to be flexibly adjusted according to seasonal changes through the boat-shaped switch S2. The first temperature-controlled switch KD1 is used in summer, for example, the cut-off temperature is set to be 45 ℃, and the second temperature-controlled switch KD2 is used in winter, for example, the cut-off temperature is set to be 50 ℃. At this time, the boat switch S2 is turned on, the water temperature in the water storage tank 10 may be 50 ℃ at the maximum, the boat switch S2 is turned off, and the water temperature in the water storage tank 10 may be 45 ℃ at the maximum to accommodate the change of seasons.

The threshold value is not limited to the above example, and may be set to other values satisfying the following relationship as needed, where the second threshold value is higher than the first threshold value, the fourth threshold value is higher than the third threshold value, and the fourth threshold value is higher than the second threshold value. For example, the first threshold may be 40 ℃, the second threshold may be 44 ℃, the third threshold may be 45 ℃, and the fourth threshold may be 48 ℃. In addition, in order to stabilize the water temperature in the water storage tank 10, the upper and lower limit temperature values of the first temperature control switch KD1 and the second temperature control switch KD2 which are turned on or off are not easy to be too large, and are usually preferably within the range of 10 ℃.

In order to avoid that the first temperature control switch KD1 or the second temperature control switch KD2 is in a closed state when a self-set threshold value is exceeded, so that the water temperature is too high, the control circuit further comprises the following steps: one end of the third temperature control switch KD3 is connected with a third end (an emitter) of the second switching tube Q2, the other end of the third temperature control switch KD3 is connected with one end of the second temperature control switch KD2, and when the temperature of water in the water storage tank 10 is higher than a preset fifth threshold value (for example, 55 ℃) of the third temperature control switch KD2, the third temperature control switch KD3 is disconnected. The corresponding third temperature control switch KD2 also corresponds to a closed lower threshold value smaller than a preset fifth threshold value, and when the temperature of water in the water storage tank 10 is lower than the lower threshold value, the third temperature control switch KD2 is used. Wherein the fifth threshold is higher than the fourth threshold.

A rated 220v alternating current power supply supplies power to a transformer T through a leakage protector in a power plug, low-voltage alternating current voltage is output, then a low-voltage direct current power supply obtained through bridge type rectification and filtering of a rectifier diode (D1-D4) passes through a composite tube consisting of Q1 and Q2, and then passes through a coil JK-W of a power relay JK through KD3, KD1 or KD2 and S2 to supply power to close a normally open contact JK1 and supply power to an electric heater 108 to enable the electric heater to work, at the moment, a power indicator L1 is green, and a heating indicator L2 is red and bright. When the water temperature of the water storage tank 10 rises and reaches the control temperature of the temperature control switch (KD1 or KD2), the switch contact is disconnected, the electric heater 108 stops working, only the power indicator lamp L1 is on at the moment, the heating indicator lamp L2 is not on, when the water temperature of the water storage tank 10 is reduced to the lower limit value of the temperature control switch (KD1 or KD2), the switch contact is closed, and the electric heater 108 is powered to work and repeats continuously. For ease of understanding, the first threshold is equal to the third threshold, e.g., 40 ℃, the second threshold is 45 ℃, the fourth threshold is 50 ℃, and the fifth threshold is 55 ℃. When the power switch S1 is closed and the flow sensing switch 21 is opened, Q1 and Q2 are conducted, KD3 is closed, in summer, S2 is opened, and at the moment, the first temperature control switch KD1 is used for controlling a circuit, when the water temperature is lower than a set threshold value of the first temperature control switch KD1, such as 45 ℃, the first temperature control switch KD1 is closed to control the heating of the electric heater 108, in winter, S2 is closed, and when the water temperature is lower than a set threshold value of the second temperature control switch KD2, such as 50 ℃, the second temperature control switch KD2 is closed to control the heating of the electric heater 108. If the electric heater 108 cannot be switched off when the first temperature control switch KD1 or the second temperature control switch KD2 fails, a protection function is performed, for example, when the water temperature exceeds 55 ℃, the third temperature control switch KD3 is switched off, and the water temperature in the water storage tank 10 is ensured not to exceed 55 ℃ at most.

The first switch Q1 and the second switch Q2 are not limited to the NPN transistors shown in the figures, but may be replaced by N-channel field effect transistors (N-MOS transistors), where the gate of the MOS transistor is equivalent to the base, the source is equivalent to the emitter, and the drain is equivalent to the collector.

The first temperature control switch KD1, the second temperature control switch KD2 and the third temperature control switch KD3 are all arranged at the top of the water storage tank 10 so as to be convenient to install. The first temperature control switch KD1, the second temperature control switch KD2 and the third temperature control switch KD3 can all adopt dbs301 electronic temperature controllers.

It should be noted that the circuit diagram of the control circuit is not limited to the schematic diagram of the above example, and may have various modifications, for example, based on the circuit shown in fig. 4 and the circuit shown in fig. 6, such as a circuit obtained by modifying the circuit shown in fig. 6, and a part of the first temperature-controlled switch KD1, the second temperature-controlled switch KD2, the third temperature-controlled switch KD3 and the navicular switch S2 in fig. 6 is connected to a circuit of the R1 and the capacitor C located in the upper right part in fig. 4 in the connection manner in fig. 6.

Wherein, the three rectangular blocks in the filling layer in fig. 3 are the temperature control switches KD1, KD2 and KD 3; LK in fig. 5 and 6 is a flow sensing switch 21; TH in fig. 4, 5 and 6 is the electric heater 108.

In addition, as an embodiment, in order to detect whether cold water or hot water flows out from the water outlet end of the gas water heater and the corresponding temperature, the control circuit further comprises a fourth temperature control switch KD4 (not shown in the figure). One end of the fourth temperature control switch KD4 is connected with one end of the third temperature control switch KD3, and the other end of the fourth temperature control switch KD4 is connected with the third end of the second switch tube Q2. The fourth temperature controlled switch KD4 is mounted on the water inlet pipe 101 of the thermostat 100. The upper limit temperature of the opening of the fourth temperature control switch KD4 may be set to 40 deg.c and the lower limit temperature of the closing may be set to 36 deg.c. The principle is that after the gas water heater works for a while, the water temperature of the whole water storage tank 10 is equal to the set outlet water temperature of the gas water heater, the temperature of the water temperature is often lower than the preset temperature of the water storage tank 10, the gas water heater is suspended after being used for a while, and the electric heater 108 is started to heat the water temperature of the water storage tank 10 to the preset temperature. When the gas water heater is turned on again after the suspension for a while, the outlet water temperature of the gas water heater is 2-3 ℃ higher than the set temperature of the gas water heater, and is recovered to the outlet water temperature set by the gas water heater after 1-2 minutes.

It should be noted that, if the inlet water temperature detection is set on the inlet water pipe 101, that is, the control circuit is set with the fourth temperature control switch KD4, because the upper limit temperature of the disconnection of the fourth temperature control switch KD4 is set to 40 ℃, when the water temperature of the inlet water pipe 101 is higher than 40 ℃, the fourth temperature control switch KD4 will disconnect the electric heater 108 to delay heating, and only when the water temperature of the inlet water pipe 101 is naturally cooled to the lower limit of 36 ℃, the heating will be performed, so that the temperature difference between the two water outlets before and after the water outlet is reduced in the process of multiple times of suspension and starting of the gas water heater.

The temperatures of the above examples are only given as examples for easy understanding, and are not to be construed as limitations of the present application, which can be flexibly adjusted according to actual needs. The embodiment of the application provides a thermostat 100 has small, light in weight, high durability and convenient installation, and advantages such as low price, during the installation with gas heater next hang side by side on the wall can, need not arrange the water pipeling again, only need to pass through explosion-proof hose with this gas heater's play water port and the inlet tube 101 intercommunication of thermostat 100, thermostat 100's outlet pipe 102 and hot water valve intercommunication, no matter be in proper order that the new house fitment or the various brand gas heater of having installed all are suitable for, compare with current hot water circulating system, its usability is stronger, the price is cheaper.

The thermostat 100 and the existing gas water heater can be separated from each other, and the thermostat 100 and the existing gas water heater can be hung on a wall side by side during installation, as an implementation mode, the thermostat 100 and the existing gas water heater can be integrated together to form an integral intelligent water heater 200, so that a circuit line and some parts can be considered together, for example, the thermostat is arranged on the same circuit board to reduce the cost, the structure is compact, the appearance is attractive, and meanwhile, the occupied volume can be reduced. As shown in fig. 7, the intelligent water heater 200 includes a housing, a gas heating device and the thermostat 100, and a cold water valve and a hot water valve, which are disposed outside the housing. The water inlet port of the gas heating device is connected with the cold water valve, the water outlet port of the gas heating device is connected with the water inlet pipe 101 of the thermostat 100, and the water outlet pipe 102 of the thermostat 100 is connected with the hot water valve. Wherein, the filler in fig. 7 is an insulating layer 40.

Wherein, gas heating device includes: a condensing heat exchanger 210, a sensible heat exchanger 220, a burner 230, a fan 240, and a condensate recovery device 250. The condensation heat exchanger 210 is communicated with the sensible heat exchanger 220 through a pipeline, the condensation heat exchanger 210 is further communicated with the cold water valve through a pipeline, the sensible heat exchanger 220 is communicated with the water inlet end of the thermostat 100 through a pipeline, and the water outlet pipe 102 of the thermostat 100 is communicated with the hot water valve. The combustor 230 is located below the sensible heat exchanger 220, natural gas is connected through a pipeline, chemical reaction (combustion) occurs in the combustor 230 through the natural gas, heat and flue gas are generated, the generated heat is supplied to the sensible heat exchanger 220 and is exchanged with water in the pipeline of the sensible heat exchanger 220, the generated flue gas is discharged to the position of the condensing heat exchanger 210 through the fan 240, after the hot flue gas contacts a cold pipeline of the condensing heat exchanger 210, moisture in the flue gas is condensed and is collected by the condensate water recovery device 250 and then discharged, and the rest of the flue gas is discharged through a flue gas pipeline arranged at the top of the water heater. The fan 240 is located above the sensible heat exchanger 220 and is used for discharging the flue gas in the sensible heat exchanger 220 to the condensing heat exchanger 210. The condensed water recovery device 250 is located below the condensing heat exchanger 210 and is used for collecting the condensed water generated by the condensing heat exchanger 210. The intelligent water heater 200 integrates the thermostat 100 with an existing gas water heater to form a whole.

The working principle is as follows: a certain amount of hot water is stored in the water storage tank 10 of the thermostat 100, when the water heater is just started, because the hot water has a starting process, cold water which is not heated can fully mix the cold water entering the water storage tank 10 with the hot water through the safety check valve 107, the water inlet pipe 101, the drainage pipe 105 and the return pipe 103 of the thermostat 100 and then flows out, the starting process of the water heater is reduced, the quick hot water outlet is realized, cold water which is not heated and is generated when the water heater is just started and hot water which is instantly changed due to the start and stop of the water heater in the use process are not heated, compared with the hot water amount of the water storage tank 10, the hot water amount is smaller, and the water temperature of the whole water storage tank 10 can not be greatly changed. In addition, the hot water valve is opened, the power supply of the electric heater 108 of the thermostat 100 is cut off, on one hand, the use is safer, on the other hand, the temperature of the whole water storage tank 10 depends on the set water outlet temperature of the water heater, the water storage tank 10 also buffers and regulates the hot water generated by the water heater, the water temperature is more stable, and then the constant temperature can be realized by controlling the water storage temperature according to different seasons, the thermostat 100 also has various safety protection measures, leakage protection, grounding protection, power-off protection, over-temperature protection, overpressure protection, water leakage protection, short-circuit protection and dry burning protection, and the over-value enjoyment of the common water heater can be realized by matching the thermostat 100 with the common water heater.

It should be noted that, in the present specification, the embodiments are all described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments may be referred to each other.

The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (10)

1. A thermostat, comprising:

the water storage tank is externally provided with a water inlet pipe and a water outlet pipe which are communicated with the water storage tank, a backflow pipe and an electric heater are arranged in the water storage tank, the backflow pipe is communicated with the water outlet pipe, the backflow pipe is provided with a water inlet hole, the water inlet pipe is used for being connected with a water outlet port of a gas water heater, the water outlet pipe is used for being connected with a hot water valve of the gas water heater, and the electric heater is used for heating water in the water storage tank; and

and the control circuit is electrically connected with the electric heater and is used for controlling the on-off of the electric heater.

2. The thermostat of claim 1, wherein the water outlet pipe is arranged at the bottom of the water storage tank, the bottom end of the return pipe is connected with the water outlet pipe, the top end of the return pipe is positioned at the middle upper part of the water storage tank, and the water inlet hole is arranged at the middle lower part of the return pipe.

3. A thermostat according to claim 2 wherein the return tube includes an inner return tube and an outer return tube; the backflow inner tube is located in the backflow outer tube, the bottom end of the backflow inner tube is communicated with the water outlet tube, the water inlet hole is formed in the backflow outer tube, the length of the backflow inner tube is smaller than that of the backflow outer tube, and the backflow inner tube is located on the middle upper portion of the water storage tank.

4. A thermostat according to claim 1 wherein the control circuit comprises: the first end of the first switch tube is connected with the first end of the second switch tube, the first end of the first switch tube is connected with the second end of the first switch tube, the first end of the first switch tube is connected with a power supply, the third end of the first switch tube is connected with the second end of the second switch tube, the third end of the second switch tube is connected with the electric heater, the second end of the first switch tube is connected with one end of the flow sensing switch, the other end of the flow sensing switch is grounded, the flow sensing switch is arranged on the water outlet pipe, when the hot water valve is opened, the flow sensing switch is closed, and the electric heater is in a power-off state.

5. A thermostat according to claim 4 wherein the control circuit further comprises: the water heater comprises a first temperature control switch, a second temperature control switch and a boat-shaped switch, wherein the first temperature control switch is connected with the second temperature control switch in parallel, one end of the second temperature control switch is connected with the third end of a second switch tube, the other end of the second temperature control switch is connected with the boat-shaped switch in series and then is connected with the electric heater, when the temperature of water in the water storage tank is lower than a preset first threshold value of the first temperature control switch, the first temperature control switch is closed, and when the temperature of water in the water storage tank is higher than a preset second threshold value of the first temperature control switch, the first temperature control switch is disconnected; when the water temperature in the water storage tank is lower than a preset third threshold value of the second temperature control switch, the second temperature control switch is turned on, and when the water temperature in the water storage tank is higher than a preset fourth threshold value of the second temperature control switch, the second temperature control switch is turned off, wherein the second threshold value is higher than the first threshold value, the fourth threshold value is higher than the third threshold value, and the fourth threshold value is higher than the second threshold value.

6. A thermostat according to claim 5 wherein the control circuit further comprises: and one end of the third temperature control switch is connected with the third end of the second switch tube, the other end of the third temperature control switch is connected with one end of the second temperature control switch, and when the water temperature in the water storage tank is higher than a preset fifth threshold value of the third temperature control switch, the third temperature control switch is switched off, wherein the fifth threshold value is higher than the fourth threshold value.

7. The thermostat according to any one of claims 1 to 6, wherein a drainage tube is further arranged in the water storage tank, the bottom end of the drainage tube is communicated with the water inlet tube, the top end of the drainage tube is positioned at the middle upper part of the water storage tank, and a water permeable hole is formed in the drainage tube.

8. A thermostat according to any one of claims 1-6 wherein the water inlet pipe is connected to the water outlet of the gas water heater by a high pressure hose, and a safety check valve is provided at the water inlet pipe.

9. A thermostat according to any one of claims 1-6 further comprising a housing, wherein the water storage tank and the housing are filled with insulation.

10. An intelligent water heater comprising a housing and a gas heating device and a thermostat as claimed in any one of claims 1-9 disposed within the housing, and a cold water valve and a hot water valve disposed outside the housing; the water inlet port of the gas heating device is connected with the cold water valve, the water outlet port of the gas heating device is connected with the water inlet pipe of the thermostat, and the water outlet pipe of the thermostat is connected with the hot water valve.