CN112747462B

CN112747462B - Electric water heater system and control method thereof

Info

Publication number: CN112747462B
Application number: CN202110164709.5A
Authority: CN
Inventors: 梁海迎
Original assignee: Foshan Shunde Jnod Electrical Appliance Co ltd
Current assignee: Foshan Shunde Jnod Electrical Appliance Co ltd
Priority date: 2021-02-05
Filing date: 2021-02-05
Publication date: 2021-11-30
Anticipated expiration: 2041-02-05
Also published as: CN112747462A

Abstract

The invention discloses an electric water heater system, which comprises a first inner container, a second inner container, a heating body, a water proportional valve and a water pump, wherein the water proportional valve is provided with four water pipe connectors, a middle water pipe is arranged between the first inner container and the second inner container, a first hot water pipe is arranged between the first inner container and the heating body, a second hot water pipe is arranged between the second inner container and the water proportional valve, a water mixing pipe is arranged between the water proportional valve and the heating body, a water dividing pipe is arranged between the water proportional valve and the first hot water pipe, the water proportional valve is also provided with a cold water pipe communicated with an external water source, the cold water pipe is communicated with the first hot water pipe, and the water pump is arranged on the water mixing pipe. The invention also discloses a control method of the electric water heater system, and the electric water heater system can realize automatic constant-temperature water outlet by using the control method, thereby saving water resources and bringing better use experience to users.

Description

Electric water heater system and control method thereof

Technical Field

The invention relates to the technical field of water heaters, in particular to an electric water heater system and a control method thereof.

Background

The electric water heater is a water heater which takes electricity as energy source for heating, and is one of three water heaters which are parallel to a gas water heater and a solar water heater. At present, the common electric water heaters on the market mainly comprise an instant electric water heater and a storage electric water heater.

The instant electric water heater is provided with a high-power electric heating tube in a small metal water storage tank, is usually directly arranged in a bathroom and is connected with a hot water pipeline, and a user heats and warms up while opening a faucet to obtain hot water. The advantages of the water heater are fast heating speed and small volume of the device. The storage type electric water heater mainly installs the electric heating tube in the large capacity metal water storage tank, when working, heats the water in the water tank to the set temperature in advance, when in use, the hot water is discharged through the hot water pipe and mixed with the cold water of the tap water pipe, thereby adjusting the proper water temperature. The water heater has the advantages of large water quantity and small working current.

When the existing electric water heater is used, when the distance between a water using point and a hot water outlet of the electric water heater is long, and when hot water is used every time, cold water in a hot water pipeline needs to be discharged, and then the hot water flows out. This requires the user to wait a long time and cold water is wasted.

In order to solve the problems, zero-cold-water type electric water heaters are correspondingly provided in the market, and users need to start a pipeline cold water preheating function on the electric water heater in advance before taking hot water to heat cold water in a pipeline in advance. However, starting the pipeline cold water preheating function of the electric water heater requires a user to run to the electric water heater for operation, and the user often forgets to start the function of the electric water heater when the user is busy, so that the intelligent degree is not high.

Disclosure of Invention

In order to overcome the technical defects, the invention provides an electric water heater system and a control method thereof, which can automatically start the function of preheating cold water in a pipeline when the starting condition is reached so as to realize constant-temperature water outlet and bring better use experience to users while saving water resources.

In order to solve the problems, the invention is realized according to the following technical scheme:

the invention relates to an electric water heater system, which comprises a first inner container, a second inner container, a heating body, a water proportional valve and a water pump, wherein the water proportional valve is provided with four water pipe interfaces, an intermediate water pipe is arranged between the first inner container and the second inner container, a first hot water pipe is arranged between the first inner container and the heating body, a second hot water pipe is arranged between the second inner container and the water proportional valve, a water mixing pipe is arranged between the water proportional valve and the heating body, a water diversion pipe is arranged between the water proportional valve and the first hot water pipe, a cold water pipe communicated with an external water source is also arranged on the water proportional valve, the cold water pipe is communicated with the first hot water pipe, the water pump is arranged on the water mixing pipe, and the electric water heater further comprises at least one-way valve, a temperature probe, a flow meter and a flow switch which are arranged on the electric water heater system.

As a further explanation of the above solution, the check valve is provided with two on the first hot water pipe and one on the cold water pipe.

As a further explanation of the above scheme, the temperature probe includes a water mixing temperature probe, a water inlet temperature probe, a water outlet temperature probe and a liner temperature probe, the water mixing temperature probe is arranged on the water mixing pipe, the water inlet temperature probe is arranged on the cold water pipe, the water outlet temperature probe is arranged on the first hot water pipe, and the liner temperature probes are respectively arranged inside the first liner and the second liner.

As a further explanation of the above scheme, the flow meter is arranged on the cold water pipe, and the flow switch is arranged on the first hot water pipe.

As a further explanation of the above scheme, the water inlet temperature probe is arranged at a position close to the water proportional valve, and the water mixing temperature probe and the water outlet temperature probe are arranged at a position close to the heating body.

The invention also provides a control method of the electric water heater system, which comprises an internal circulation heating method, an external circulation heating method, a normal water heating method and a water flow adjusting method.

As a further explanation of the above scheme, the internal circulation heating method is specifically as follows:

1) judging whether the electric water heater system simultaneously meets two starting conditions that a flow signal is not detected and the water temperature of the second inner container is less than 5 ℃ of a set value of the inner container temperature, and if not, not entering the next step;

2) if the conditions are met, the water proportional valve is adjusted to the position where only the water mixing pipe is communicated with the second hot water pipe, the water pump and the heating body are started, the water pump is guided into the heating body after self-checking is finished to be circularly heated until the water temperature of the second inner container reaches a set temperature value of the inner container, then the heating body is stopped to be heated, the water proportion is adjusted to the outer circulating position where only the water mixing pipe is communicated with the cold water pipe, the water pump is stopped after being delayed for 30 seconds, and the water pump enters a standby state.

As a further explanation of the above scheme, the external circulation heating method is specifically as follows:

1) judging whether the electric water heater system detects a flow signal or not, and if not, not entering the next step;

2) if a flow signal is detected, the water proportional valve is adjusted to an external circulation position only communicated with the water mixing pipe and the cold water pipe, the water pump and the heating body are started, water is guided into the heating body to be circularly heated for 60 seconds according to a set value of the outlet water temperature after the self-checking of the water pump is completed, then the water proportional valve is adjusted to a water mixing position communicated with the water dividing pipe, the water mixing pipe, the second hot water pipe and the cold water pipe, and the water pump and the heating body stop working;

3) when the water pump and the heating body stop working, if a flow signal can be detected, the heating body is started without changing the water mixing position on the water proportional valve, and water enters the heating body to be circularly heated according to the set value of the water outlet temperature.

As a further explanation of the above scheme, the heating method with normal water is specifically as follows:

1) judging whether the electric water heater system is in a standby state or after the external circulation heating is finished for 60 seconds, detecting a flow signal, and if the conditions cannot be met at the same time, not entering the next step;

2) if the conditions are met, the water proportional valve is adjusted to the water mixing position where the water dividing pipe, the water mixing pipe, the second hot water pipe and the cold water pipe are communicated, the conduction proportion of the water dividing pipe, the second hot water pipe and the cold water pipe on the water proportional valve is adjusted according to the water outlet temperature requirement, the water outlet temperature of mixed water is kept at 30 +/-3 ℃, the water pump stops working, the heating body starts heating after 2 seconds of delay, and water enters the heating body to be circularly heated until the water outlet temperature reaches the water outlet temperature set value.

As a further explanation of the above scheme, the water flow adjusting method specifically comprises the following steps:

1) under the working state that the water proportional valve is adjusted to the water mixing position where the water dividing pipe, the water mixing pipe, the second hot water pipe and the cold water pipe are communicated, the water proportional valve is adjusted to the position where only the water mixing pipe and the water dividing pipe are communicated, the water outlet temperature is judged to be not up to the water outlet temperature set value, and if the water outlet temperature is up to the water outlet temperature set value, the next step is not carried out;

2) if the water temperature reaches the set water temperature, the water flow is adjusted by the water proportional valve by changing the conduction sizes of the water mixing pipe and the water dividing pipe until the water outlet temperature reaches the set water temperature.

Compared with the prior art, the invention has the beneficial effects that:

the electric heater system of the invention arranges the working parts reasonably and has unique pipeline design, the water proportional valve with four water pipe interfaces is arranged to realize different function control under the system, the temperature probe and the flow meter arranged in the system can be used as information sources for starting corresponding function control, the check valve, the flow meter and the flow switch arranged in the system are used as intermediate parts for realizing function control, and the control methods of an internal circulation heating method, an external circulation heating method, a normal water heating method and a water flow adjusting method are combined under the matching of the water proportional valve to automatically realize the functions of preheating pipeline cold water, outputting water at constant temperature and the like, the intelligent degree is high, better use experience is brought to users while water resources are saved, and the invention has good market prospect.

Drawings

Embodiments of the invention are described in further detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a schematic structural diagram of an electric water heater system according to the present invention;

FIG. 2 is a diagram of the operating state of the internal circulation heating method of the present invention;

FIG. 3 is a diagram of the operating state of the external circulation heating method of the present invention;

FIG. 4 is a diagram illustrating the operation of the normal water heating method and the water flow adjusting method according to the present invention;

FIG. 5 is a schematic diagram of a water proportional valve in an electric water heater system according to the present invention;

FIG. 6 is a cross-sectional structural view of a water proportional valve in an electric water heater system of the present invention;

FIG. 7 is an exploded view of a water proportional valve in an electric water heater system according to the present invention;

FIG. 8 is a schematic structural diagram of a valve body in a water proportional valve in an electric water heater system according to the present invention;

FIG. 9 is a schematic view of the valve stem of the proportional water valve in an electric water heater system according to the present invention;

FIG. 10 is a schematic structural view of an end cap in a water proportional valve in an electric water heater system according to the present invention;

in the figure: 1. a valve body; 2. a valve port; 3. a valve stem; 4. a water inlet and outlet; 41. a groove-shaped water inlet and outlet; 42. an annular water inlet and outlet; 5. cutting; 51. a rectangular cut; 52. a groove-shaped cut; 53. an arc-shaped notch; 6. a transmission gear; 7. a motor; 8. an inner gear ring; 9. rotating the cover; 10. a first communication port; 11. an end cap; 12. a second communication port; 13. an orifice; 14. an installation port; 15. a bearing; 16. a fixing plate; 17. a limiting part; 18. a chute; 19. a columnar portion; 20. an annular groove; 21. a seal ring; 22. a flange portion; 23. connecting lugs; 31. a first inner container; 32. a second inner container; 33. a heating body; 34. a water proportional valve; 35. a water pump; 36. a middle water pipe; 37. a first hot water pipe; 38. a second hot water pipe; 39. a water mixing pipe; 40. a water diversion pipe; 41. a cold water pipe; 42. a one-way valve; 43. a mixed water temperature probe; 44. a water inlet temperature probe; 45. a water outlet temperature probe; 46. a liner temperature probe; 47. a flow meter; 48. a flow switch.

Detailed Description

The preferred embodiments of the present invention will be described in conjunction with the accompanying drawings, and it will be understood that they are described herein for the purpose of illustration and explanation and not limitation.

As shown in fig. 1 to 10, the electric water heater system according to the present invention includes a first inner container 31, a second inner container 32, a heating body 33, a water proportional valve 34 and a water pump 35, wherein the water storage capacity of the first inner container 31 is the same as that of the second inner container 32, and the first inner container 31 and the second inner container 32 store water simultaneously to store more hot water for users to use at any time, so as to avoid the problem that the users need to wait for heating frequently due to less water storage capacity during the peak period of hot water use.

The water proportional valve 34 can regulate the opening of each water pipe connected with the water proportional valve to accurately control the water flow, so as to control the related functions of the electric heater system, such as constant-temperature water outlet. In this embodiment, the water proportional valve 34 is provided with four water pipe connectors for connecting to a plurality of water pipes of the electric water heater system. The heating body 33 can rapidly heat cold water flowing into the heating body, and flows out of a pipeline, so that the heating body is a core component of an electric water heater system. The water pump 35 is arranged on the water mixing pipe 39, the electric energy is converted into mechanical energy when the water pump 35 works, so that fast flowing water is generated in the water pipe connected with the water pump, the fast flowing water is a power component of the electric water heater system, specifically, when the water pump 35 is arranged on the water mixing pipe 39, the water inlet of the water pump is one end close to the water proportional valve 34, the water outlet of the water pump is one end close to the heating body 33, therefore, the distance between the water outlet of the water pump 35 and the water inlet of the heating body 33 is very short, and the kinetic energy water generated when the water pump 35 works flows into the heating body 33 fast for heating.

An intermediate water pipe 36 is provided between the first and second

inner containers

31 and 32, and water in the first and second

inner containers

31 and 32 can flow through the intermediate water pipe 36. A first hot water pipe 37 is arranged between the first inner container 31 and the heating body 33, the first hot water pipe 37 can enable water flow on the heating body 33 to lead to the first inner container 31, namely, water can flow into the first inner container 31 through the first hot water pipe 37 after being heated by the heating body 33; the first hot water pipe 37 can also lead the water flow on the heating body 33 to the cold water pipe 41 for mixing, and an opening connected with an external water path (such as a shower nozzle) is arranged at the position of the first hot water pipe 37 close to the cold water pipe 41. A second hot water pipe 38 is arranged between the second inner container 32 and the water proportional valve 34, and the second hot water pipe 38 can enable water on the water proportional valve 34 to mutually communicate with the second inner container 32.

A water mixing pipe 39 is arranged between the water proportional valve 34 and the heating body 33, and the water mixing pipe 39 can lead the water on the water proportional valve 34 to the heating body 33. A water diversion pipe 40 is arranged between the water proportional valve 34 and the first hot water pipe 37, and the water diversion pipe 40 can lead the water on the first inner container 31 to flow into the water proportional valve 34. The water proportional valve 34 is further connected to a cold water pipe 41 communicating with an external water source, and the cold water pipe 41 is communicated with the first hot water pipe 37, and cold water can flow into the cold water pipe 41 from the external water source.

In addition, three check valves 42, five temperature probes, a flow meter 47 and a flow switch 48 are provided on the electric water heater system.

The check valves 42 are provided in two on the first hot water pipe 37 and one on the cold water pipe 41. The two check valves 42 on the first hot water pipe 37 are installed in opposite directions, and one check valve 42 on the first hot water pipe 37 is installed near the cold water pipe 41, so that water on the cold water pipe 41 cannot directly flow into the first hot water pipe 37 from the intersection of the cold water pipe 41 and the first hot water pipe 37, but water on the first hot water pipe 37 can flow into the cold water pipe 41; another check valve 42 is installed on the first hot water pipe 37 near the first inner container 31 so that the water on the first inner container 31 cannot flow back to the heating body 33 or the cold water pipe 41, and the water flowing out of the heating body 33 can directly flow into the first inner container 31. The check valve 42 is installed on the cold water pipe 41, so that the water from the external water source can only flow into the water proportional valve 34, and the water on the water proportional valve 34 can not flow back to the cold water pipe 41.

The temperature probe can monitor the temperature of the water area at the installation position of the temperature probe in real time and output temperature information to supply the water heater system for corresponding control, the temperature probe comprises a mixed water temperature probe 43, an inlet water temperature probe 44, an outlet water temperature probe 45 and a liner temperature probe 46, the mixed water temperature probe 43 is arranged at the position, close to the heating body 33, on the water mixing pipe 39 so as to detect the temperature value of water from the water pump 35 in real time; the inlet water temperature probe 44 is arranged at a position on the cold water pipe 41 close to the water proportional valve 34, namely a position between the check valve 42 on the cold water pipe 41 and the water proportional valve 34, so as to detect the temperature value of water coming from an external water source or the temperature value after water mixing in real time; the outlet water temperature probe 45 is arranged on the first hot water pipe 37 and close to the heating body 33 so as to detect the temperature value of the hot water from the heating body 33 in real time; the inner container temperature probes 46 are respectively arranged inside the first inner container 31 and the second inner container 32, and can respectively detect the temperature values of the water in the first inner container 31 and the second inner container 32 in real time. And integrating data by a control panel in the electric water heater system through temperature values obtained by the temperature probes so as to perform corresponding function control.

A flow meter 47 is arranged at a position between the inlet water temperature probe 44 and the check valve 42 on the cold water pipe 41, the flow meter 47 is used for metering the water flow rate flowing into the water proportional valve 34 and controlling the opening and closing operation of the cold water or the mixed water flowing into the water proportional valve 34 on the cold water pipe 41; the flow switch 48 is provided between the outlet temperature probe 45 of the first hot water pipe 37 and the check valve 42 of the cold water pipe 41, and the flow switch 48 is used for controlling the on/off operation of the hot water flowing out of the heating body 33 into the cold water pipe 41.

It should be understood that the heating body 33, the water pump 35, the check valve 42, the mixed water temperature probe 43, the inlet water temperature probe 44, the outlet water temperature probe 45, the liner temperature probe 46, the flow meter 47 and the flow switch 48 can all be implemented by using the prior art conditions, and therefore, the working principle thereof will not be described in detail.

The specific structure of the water proportioning valve 34 is described as follows:

as shown in fig. 5 to 10, the water proportional valve 34 includes a valve body 1 having a cylindrical structure, a valve port 2 is opened on the valve body 1, the valve port 2 and the valve body 1 are coaxial, an inner diameter of the valve port 2 is larger than a maximum outer diameter of the valve rod 3 to ensure smooth rotation of the valve rod 3 in the valve port 2 and not to generate rotational friction resistance, a wall thickness of the valve port 2 on the valve body 1 is uniform on the circumferential side, a blocking shoulder is provided in the valve port 2, and the valve rod 3 is installed in place when the valve rod 3 slides into the valve body 1 along the valve port 2 to abut against the shoulder in the valve port 2 at an end surface of a sliding end of the valve rod 3. Because the structure of the valve body 1 is complex, in actual manufacturing, a casting process is preferably selected for production, and the valve body can be formed by fine machining after being cast, so that the production cost can be reduced to a great extent, and economic benefits can be brought to mass production enterprises.

The end of the valve body 1 far away from the water inlet and outlet 4 is provided with a mounting port 14, a bearing 15 is slidably mounted in the mounting port 14, the opening depth of the mounting port 14 is larger than the width of the bearing 15, the matching relation between the bearing 15 and the mounting port 14 is clearance fit, and specifically, the opening diameter of the mounting port 14 is 0.2 mm larger than the maximum outer diameter of the bearing 15. In this embodiment, the thrust ball bearing 15 is specifically selected as the bearing 15, the bearing 15 can bear the axial load from the valve rod 3 and support the rotation of the valve rod 3 when the valve rod 3 operates, in addition, the bearing 15 can make the valve rod 3 have good centering performance, so that the rotation precision of the valve rod 3 can be ensured when the valve rod 3 rotates, one end of the valve rod 3, which is far away from the bearing 15, is not easy to shake and collide with the valve body 1, the valve rod 3 and the valve body 1 are protected, and the service life of the water proportional valve is prolonged while the movement precision is ensured. The internal diameter size of bearing 15 is greater than the biggest external diameter of drive gear 6 on the valve rod 3, valve rod 3 is equipped with cooperation portion in the installation mouth 14 position department of valve body 1 when installing in valve body 1, the external diameter of this cooperation portion cooperatees with the internal diameter of bearing 15, when the installation, directly with bearing 15 from the drive gear 6 end of valve rod 3 slide in the installation mouth 14 cooperation and the installation mouth 14 diapire face butt on the installation mouth in the valve body 1 with the cooperation portion cooperation and with the valve rod 3 of valve rod 1 promptly install and target in place, when valve rod 3 rotated, because the 14 opening depths of installation mouth are greater than the width of bearing 15, the rotation end on the bearing 15 does not contact with the 14 wall contacts of installation mouth of valve body 1, thereby valve body 1 and bearing 15 have been protected.

One end of the valve body 1 close to the water inlet and outlet 4 is provided with a circular thin plate-shaped flange part 22, the flange part 22 and the valve body 1 are of an integrated structure, a round corner is arranged at the sharp corner of the flange part 22, the hand or other parts can be prevented from being scratched when the valve body is assembled or carried, a good protection effect is achieved, three threaded holes which are uniformly distributed in the circumferential direction are correspondingly formed in the end cover 11, the opening depth of each threaded hole penetrates through the thickness of the whole flange part 22, correspondingly, three through holes are correspondingly formed in the end cover 11 and the matched surface of the flange part 22, and the size of each through hole is slightly larger than the inner tooth diameter of each threaded hole by 0.2-0.4 mm. In addition, positioning holes are respectively formed in the end cover 11 and the flange portion 22, when the end cover 11 slides into the valve body 1 until the end surface of the end cover abuts against the flange portion 22, the end cover 11 is rotated to correspond to the positioning holes, namely, a correct mounting position, and then the end cover 11 is detachably mounted on the valve body 1 by penetrating bolts at the flange portion 22.

The symmetry is equipped with two engaging lugs 23 on the one end lateral surface that valve body 1 kept away from inlet outlet 4, engaging lug 23 has certain thickness, the thickness that is greater than flange portion 22 of its thickness, two engaging lugs 23 also do into integral type structure with valve body 1, set up threaded hole on each engaging lug 23, the trompil degree of depth of screw hole runs through the thickness of whole engaging lug 23, correspondingly, two through-holes have been seted up on fixed plate 16, the size of passing through also is greater than threaded hole internal tooth diameter 0.2 to 0.4 millimeter, the terminal surface that is equipped with engaging lug 23 department with valve body 1 when the installation is laminated with fixed plate 16, then valve body 1 is through passing bolt detachably and installing in fixed plate 16 in engaging lug 23 department.

Three water inlets and outlets 4 penetrating through the valve port 2 are arranged on the outer side surface of the valve body 1, each water inlet and outlet 4 comprises a groove-shaped water inlet and outlet 41 and an annular water inlet and outlet 42, two groove-shaped water inlets and outlets 41 are symmetrically arranged at the same height position of the outer side surface of the valve body 1, one annular water inlet and outlet 42 is arranged at the position of the outer side surface of the valve body 1 staggered with the two groove-shaped water inlets and outlets 41, the annular water inlet and outlet 42 and the groove-shaped water inlet and outlet 41 are not at the same height position on the valve body 1, the position of the annular water inlet and outlet 42 is closer to the flange part 22 on the valve body 1, the opening size of the groove-shaped water inlet and outlet 41 is larger than the annular water inlet and outlet 42, and under the condition that the groove-shaped water inlet and outlet 41 and the annular water inlet and outlet 42 are fully opened, the water flow of the groove-shaped water inlet and outlet 41 is larger than the annular water inlet and outlet 42, so that the groove-shaped water inlet and outlet 41 is connected with a pipeline with large water flow, two symmetrical groove-shaped water inlets and outlets 41 are usually connected with an external cold water inlet pipe and an inner container on the gas water heater. The corresponding bellying that is provided with of corresponding flute shape inlet outlet 41 and annular inlet outlet 42 department, the bellying sets up with valve body 1 is integrative, is equipped with the hole that communicates flute shape inlet outlet 41 or annular inlet outlet 42 on the bellying, through set up the bellying on valve body 1, can be convenient for connect the pipeline, and the pipeline disect insertion inner bore department on the bellying and twine waterproof glue can connect the use, and is simple swift.

The motor 7 is provided with a flat fixing plate 16, and the valve body 1 is arranged on the motor 7 through the fixing plate 16. Two through holes for passing bolts are formed in the fixing plate 16 and are symmetrical to each other, the connecting line of the two through holes is perpendicular to the connecting line of the two through holes for fixing the valve body 1, in addition, holes for positioning are formed beside the two through holes respectively, positioning columns are correspondingly arranged on the motor 7, when the motor is installed, the positioning holes in the fixing plate 16 are aligned to the positioning columns on the motor 7 to be matched with each other, namely, the motor is installed in place, and then the fixing plate 16 and all the parts of the valve body 1 are detachably installed on the motor 7 by passing the bolts.

A columnar valve rod 3 is movably mounted in a valve port 2 of the valve body 1, an inner hole for water supply circulation is formed in the part with the larger diameter of the valve rod 3, and the part with the smaller diameter is in a solid rod shape. Four notches 5 which can be communicated with the water inlet and outlet 4 are formed in the outer side face of the valve rod 3, each notch 5 is communicated with an inner hole in the valve rod 3, specifically, the notches 5 comprise rectangular notches 51, groove-shaped notches 52 and arc-shaped notches 53, the two rectangular notches 51 are formed in the same height position on the outer side face of the valve rod 3, and the rectangular notches 51 are formed around the wall face of the valve rod 3; the groove-shaped notch 52 is arranged between two rectangular notches 51 on the outer side surface of the valve body 1, the opening shape of the groove-shaped notch 52 is similar to that of the groove-shaped water inlet and outlet 41, the groove-shaped notch 52 and the rectangular notches 51 are at the same height position, and the opening width of the groove-shaped notch 52 is consistent with that of the rectangular notches 51; one end of the rectangular notch 51 on the outer side surface of the valve body 1 of the arc notch 53 is provided, the arc notch 53 is also provided around the wall surface of the valve rod 3, the opening shape is irregular, and the arc notch 53 is provided with a transitional inclined surface, so that the width of the opening is gradually reduced. When the valve rod is applied to a gas water heater to control the proportion of inlet and outlet water, the water inlet and outlet amount at the positions of the connecting pipelines can be changed by rotating the specified angle of the valve rod 3, so that the functions of the water heaters such as water outlet constant temperature and the like are realized, more functions of the gas water heater can be realized under the matching action of the water proportional valve, and more use requirements of users are met.

An integrated transmission gear 6 is arranged at one end, namely the part with a smaller diameter, of the valve rod 3, the end, far away from the notch 5, of the valve rod 3, an inner gear ring 8 meshed with the transmission gear 6 is arranged at the output end of the motor 7, the transmission gear 6 has a certain width, in the embodiment, teeth of the transmission gear 6 are in a special triangular shape, so that the transmission gear 6 can conveniently slide into the output end of the motor 7 to be installed in a meshed mode, and the transmission gear 6 is tightly attached to the inner gear ring 8 on the output end of the motor 7, so that accurate transmission of torque is achieved.

Two annular grooves 20 are formed in one end, close to the transmission gear 6, of the outer side face of the valve rod 3, a sealing ring 21 is sleeved on the annular grooves 20, the sealing ring 21 is made of a material which is good in water resistance and low in friction resistance with the wall face of the valve port 2 in the valve body 1, therefore, the sealing ring 21 can be prevented from scratching the valve body 1 and reducing the rotation load of the motor 7, the phenomenon that the motor 7 is short-circuited or even damaged due to the fact that water in the valve rod 3 permeates into the transmission gear 6 and flows into the motor 7 in the actual use process can be prevented through the installation of the sealing ring 21, and the normal operation of the motor 7 is protected.

The end of the valve rod 3 provided with the transmission gear 6 is provided with a motor 7 which drives the valve rod 3 to rotate, specifically, the motor 7 adopts a stepping motor 7, and the stepping motor 7 is a motor which converts an electric pulse signal into corresponding angular displacement or linear displacement. The rotor rotates an angle or one step before inputting a pulse signal, the output angular displacement or linear displacement is proportional to the input pulse number, and the rotating speed is proportional to the pulse frequency. Therefore, the stepping motor 7 can control the angular displacement, namely the rotation angle of the valve rod 3 to control the position of the notch 5 on the valve rod 3 relative to the water inlet/outlet 4 on the valve body 1 so as to enlarge or reduce or close the water inlet/outlet 4, thereby realizing the accurate control of the water inlet/outlet quantity. In this embodiment, the motor 7 does not refer to the stepping motor 7 alone, but includes a connecting housing and other intermediate transmission components integrated with the stepping motor 7 to meet the actual requirements.

The end, far away from the transmission gear 6, in the valve rod 3 is slidably provided with a rotating cover 9, the middle part of the rotating cover 9 is concave and hollowed, the self-mass of the rotating cover 9 can be reduced, and the rotating load of the motor 7 is indirectly reduced because the rotating cover 9 rotates along with the valve rod 3. The first communicating opening 10 of arc form has been seted up on rotating the lid 9, and first communicating opening 10 can supply water to flow in or flow out, and another water circulation opening is constituteed with second communicating opening 12 on the end cover 11 to first communicating opening 10, and so far, forms four water circulation openings on the whole water proportional valve to this realizes the different function control to gas heater.

The outer side surface of the rotating cover 9 is convexly provided with two arc-shaped limiting parts 17, the two limiting parts 17 are arranged at intervals with a certain distance, the limiting parts 17 and the rotating cover 9 are of an integrated structure, correspondingly, the inner hole of the valve rod 3 is provided with a sliding groove 18 corresponding to the limiting parts 17, when the valve rod is installed, the limiting parts 17 of the rotating cover 9 are aligned with the sliding groove 18 in the valve rod 3 and slide into the other limiting structure butt joint of the end surface and the inner hole of the valve rod 3, namely, the valve rod is installed in place, the rotating cover 9 can not move towards the direction of sliding in the valve rod 3 after being limited in the valve rod 3, but can slide towards the direction of separating from the valve rod 3, at the moment, the rotating cover 9 can be prevented from moving towards the direction of separating from the valve rod 3 by abutting the end surface of the columnar part 19 on the end cover 11 and abutting the end surface of the rotating cover 9. Because the rotating cover 9 is provided with the limiting part 17, the rotating cover 9 is arranged in the valve rod 3 and then rotates synchronously along with the valve rod 3, thereby controlling the opening size of the water flow port.

An end cover 11 is fixedly installed at one end, close to the water inlet and outlet 4, of the valve body 1, the cross section of the end cover 11 is in a T shape, a columnar portion 19 is arranged on the end cover 11 in a protruding mode, the columnar portion 19 on the end cover 11 extends into the inner hole of the valve rod 3 in the valve body 1 when the valve body is installed and is abutted to the rotating cover 9, an opening is formed in the columnar portion 19 on the end cover 11, a second communicating port 12 and an opening 13 which penetrate through the opening in the columnar portion 19 are formed in the end cover 11, the arc-shaped second communicating port 12 is formed in the end face of the columnar portion 19, and the opening 13 is formed in the outer peripheral face of the columnar portion 19. When the valve is used, the end cover 11 does not rotate, the rotation of the rotating cover 9 controls the opening sizes of the first communication port 10 and the second communication port 12 to control the flow of water, and the orifice 13 corresponds to the arc-shaped notch 53 on the valve rod 3 and the annular water inlet and outlet on the valve body 1 to control the flow of water at the annular water inlet and outlet 42.

The control method of the electric water heater system is described below, and the control method includes an internal circulation heating method, an external circulation heating method, a normal water heating method, and a water flow adjusting method.

The internal circulation heating method comprises the following specific steps:

1) judging whether the electric water heater system simultaneously meets two starting conditions that the flow signal is not detected and the water temperature of the second inner container 32 is less than the set value of the inner container by more than 5 ℃ (the water temperature of the second inner container 32 is less than the set value of the inner container-5 ℃), and if not, entering the next step;

2) if the two conditions are met simultaneously, the valve rod in the water proportion valve 34 is controlled to rotate to enable the valve rod to be adjusted to the position only communicating the water mixing pipe 39 and the second hot water pipe 38, the water pump 35 and the heating body 33 are started, after the self-checking of the water pump 35 is completed and the normal starting is finished, water is guided into the heating body 33 to be circularly heated until the temperature of the water in the second inner container 32 reaches the inner container temperature set value, the heating body 33 stops heating, the valve rod in the water proportion valve is controlled to rotate to enable the valve rod to be adjusted to the outer circulating position only communicating the water mixing pipe 39 and the cold water pipe 41, the water pump 35 stops after 30 seconds of delay, and at the moment, the whole electric water heater system enters a standby state.

The external circulation heating method comprises the following specific steps:

1) judging whether the electric water heater system detects a flow signal (any signal of water inlet and outlet), if not, not entering the next step;

2) if a flow signal is detected, the valve rod in the water proportional valve 34 is controlled to rotate to enable the valve rod to be adjusted to an external circulation position only communicated with the water mixing pipe 39 and the cold water pipe 41, the water pump 35 and the heating body 33 are started, the water pump 35 is guided into the heating body 33 to circularly heat for 60 seconds according to a set water outlet temperature value after the self-detection of the water pump 35 is completed and the normal start, then the valve rod in the water proportional valve 34 is controlled to rotate to enable the valve rod to be adjusted to a water mixing position communicated with the water dividing pipe 40, the water mixing pipe 39, the second hot water pipe 38 and the cold water pipe 41, and the water pump 35 and the heating body 33 stop working;

3) when the water pump 35 and the heating body 33 stop working, if a flow signal can be detected, the heating body 33 is started without changing the water mixing position on the water proportional valve 34, and water is pressed into the heating body 33 by the water pressure of an external water source to circularly heat according to a set water outlet temperature value.

The normal water heating method comprises the following specific steps:

2) if the two conditions are met simultaneously, the valve rod in the water proportional control valve 34 is rotated to adjust the water mixing position of the water dividing pipe 40, the water mixing pipe 39, the second hot water pipe 38 and the cold water pipe 41, the valve rod in the water proportional control valve 34 is controlled to rotate according to the water outlet temperature requirement, the conduction proportion of the water dividing pipe 40 on the water proportional control valve, the second hot water pipe 38 and the cold water pipe 41 is adjusted to keep the mixed water outlet temperature at 30 +/-3 ℃, then the water pump 35 stops working, the heating body 33 starts heating after 2 seconds of delay, and the water is pressed into the heating body 33 through the water pressure of an external water source to be circularly heated until the water outlet temperature reaches the water outlet temperature set value.

The water flow adjusting method comprises the following specific steps:

1) in the working state that the water proportional valve 34 is adjusted to the water mixing position where the water dividing pipe 40, the water mixing pipe 39, the second hot water pipe 38 and the cold water pipe 41 are communicated, the valve rod in the water proportional valve 34 is controlled to rotate to enable the valve rod to be adjusted to the position where only the water mixing pipe 39 and the water dividing pipe 40 are communicated, the outlet water temperature is judged to be not reach the outlet water temperature set value, and if the outlet water temperature reaches the outlet water temperature set value, the next step is not carried out;

2) if the outlet water temperature does not reach the outlet water temperature set value, the valve rod in the control water proportional valve 34 rotates to change the conduction sizes of the water mixing pipe 39 and the water dividing pipe 40 so as to further adjust the water flow size until the outlet water temperature reaches the outlet water temperature set value.

Other structures of the electric water heater system described in the present embodiment are referred to in the prior art.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the present invention in any way, so that any modification, equivalent change and modification made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.

Claims

1. An electric water heater system, characterized in that: the water mixing device comprises a first inner container, a second inner container, a heating body, a water proportional valve and a water pump, wherein four water pipe connectors are arranged on the water proportional valve, a middle water pipe is arranged between the first inner container and the second inner container, a first hot water pipe is arranged between the first inner container and the heating body, a second hot water pipe is arranged between the second inner container and the water proportional valve, a water mixing pipe is arranged between the water proportional valve and the heating body, a water dividing pipe is arranged between the water proportional valve and the first hot water pipe, a cold water pipe communicated with an external water source is further arranged on the water proportional valve, the cold water pipe is communicated with the first hot water pipe, and the water pump is arranged on the water mixing pipe.

2. An electric water heater system according to claim 1, wherein: the check valves are arranged on the first hot water pipe in two and the cold water pipe in one.

3. An electric water heater system according to claim 1, wherein: temperature probe is including mixing water temperature probe, the temperature probe of intaking, play water temperature probe and inner bag temperature probe, mix water temperature probe and establish on mixing the water pipe, the temperature probe of intaking is established on the cold water pipe, it establishes on first hot-water line to go out water temperature probe, inner bag temperature probe is equipped with one respectively inside first inner bag and the second inner bag.

4. An electric water heater system according to claim 1, wherein: the flowmeter is arranged on the cold water pipe, and the flow switch is arranged on the first hot water pipe.

5. An electric water heater system according to claim 3, wherein: the water inlet temperature probe is arranged at a position close to the water proportional valve, and the water mixing temperature probe and the water outlet temperature probe are arranged at a position close to the heating body.

6. A control method of an electric water heater system according to any one of claims 1-5, characterized in that: comprises an internal circulation heating method, an external circulation heating method, a normal water heating method and a water flow adjusting method.

7. The control method according to claim 6, wherein the internal circulation heating method is specifically as follows:

8. The control method according to claim 6, wherein the external circulation heating method is specifically as follows:

9. The control method according to claim 6, wherein the normal water heating method is specifically as follows:

10. The control method according to claim 6, wherein the water flow adjusting method is specifically as follows: