H valve and water heater

Abstract

The H valve comprises a valve body, a force application assembly, a power unit and a temperature sensor, the force application assembly, the power unit and the temperature sensor are arranged on one side of the valve body, and the force application assembly comprises a moving part; the valve body comprises a hot water channel, a cold water channel and a water return channel. The water inlet end and the water outlet end of the water return channel can communicate with the hot water channel and the cold water channel correspondingly. The power unit comprises a driving source and a control switch, the control switch and the temperature sensor are electrically connected with the driving source, and the temperature sensor is arranged in the cold water channel or the hot water channel; the moving part is arranged between the water outlet end of the water return channel and the control switch, and the moving part can move between the water outlet end of the water return channel and the control switch; the moving part moves between the water outlet end of the water return channel and the control switch, so that the driving source works in a preheating state and is powered off when preheating is stopped, the service life of a battery is prolonged, and frequent battery replacement by a user is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of zero-cold-water water heaters, in particular to an H valve and a water heater. Background Art

[0002] Zero-cold-water gas water heaters are increasingly popular among consumers. Currently, the market generally offers two types of zero-cold-water gas water heaters: those with and without a return pipe. For those without a pre-buried return pipe, a return device is typically installed between the hot and cold water pipes at the water point, using the cold water pipe as the zero-cold-water return pipe to achieve pipe preheating. To achieve energy conservation and environmental protection, a commonly used preheating method involves using a temperature detection device to determine the return water temperature. Preheating is stopped when the return water temperature reaches a preset temperature. For example, Chinese patent CN111720999B discloses a zero-cold-water gas water heater with circulating current limiting, as well as a preheating and boosting control method. This method is used to achieve preheating. However, it still has certain disadvantages: since its return water temperature detection component is installed in the water heater body (that is, the return water temperature is detected through the entire machine), and the water heater body is generally installed in the user's balcony / kitchen location, the return water device is often installed at the user's water use point (such as the bathroom). There is a certain distance between the two, and the pipeline laying has a certain length, overheating or incomplete heating often occurs.

[0003] As for the return water device (such as the return water valve), if a temperature detection device is installed, a socket needs to be installed to power it, which will have certain installation restrictions; another way is to use battery power supply, but the ordinary battery power supply mode needs to keep the power on, which will easily cause power loss after a long time, and the battery needs to be replaced frequently, which is not energy-saving and environmentally friendly. Utility Model Content

[0004] In view of the deficiencies in the prior art, the utility model provides a low-power, more energy-efficient H-valve and water heater.

[0005] In order to solve the above technical problems, the technical solution used in the present utility model is: an H valve, comprising a valve body, and a force-applying assembly and a power unit, and a temperature sensor provided on one side of the valve body, wherein the force-applying assembly comprises a moving part;

[0006] The valve body includes a hot water channel, a cold water channel, and a return water channel, and the water inlet and outlet of the return water channel can be communicated with the hot water channel and the cold water channel respectively;

[0007] The power unit includes a driving source and a control switch, the control switch and a temperature sensor are both electrically connected to the driving source, and the temperature sensor is disposed in the cold water channel or the hot water channel; the moving member is disposed between the water outlet end of the return water channel and the control switch, and the moving member can move between the water outlet end of the return water channel and the control switch;

[0008] When the moving part moves to a position away from the water outlet end of the return water channel, the moving part may touch the control switch, and a flow gap is formed between the moving part and the water outlet end of the return water channel, and the water outlet end of the return water channel is connected to the cold water channel; when the moving part moves to a position against the water outlet end of the return water channel, the moving part closes the water outlet end of the return water channel, and the moving part is disconnected from the control switch.

[0009] Preferably, the force-applying assembly also includes an elastic member and an end cover, the end cover is fixed to the valve body, and an installation cavity is formed therein, and the movable member and the elastic member are both arranged in the installation cavity; the elastic member is sleeved on the outside of the movable member, and a step surface is provided at one end of the movable member close to the valve body, one end of the elastic member abuts against the step surface, and the other end of the elastic member abuts against the inner wall of the end cover.

[0010] Preferably, the force-applying assembly also includes an end cover and a sealing gasket, the movable part is located inside the end cover, the sealing gasket is at least partially clamped between the valve body and the end cover, and the sealing gasket is located between the water outlet end of the return water channel and the movable part; when the movable part closes the water outlet end of the return water channel, the sealing gasket abuts against the water outlet end of the return water channel, and the sealing gasket extends along its radial direction to form an inclined portion; when the movable part moves to a place away from the water outlet end of the return water channel, the flow gap is formed between the sealing gasket and the water outlet end of the return water channel, and the inclined portion of the sealing gasket changes from an inclined state to a straight state.

[0011] Preferably, the valve body includes a cold water pipe, a hot water pipe and a connecting pipe, the two ends of the connecting pipe are respectively connected to the cold water pipe and the hot water pipe, and the cold water channel and the hot water channel are respectively arranged in the cold water pipe and the hot water pipe; the valve body also includes a sleeve, the sleeve is located in the valve body and is connected to the connecting pipe, one end of the sleeve is connected to the inner wall of the connecting pipe, and the other end of the sleeve passes through the cold water channel and extends toward the direction of the force-applying component; the water inlet end of the return water channel is arranged on the connecting pipe, and the water outlet end of the return water channel is arranged on the sleeve.

[0012] Preferably, the valve body also includes a throttle block, which is sleeved on the outside of the sleeve and located at one end of the sleeve close to the force-applying component. The outer surface of the throttle block abuts against the inner wall of the valve body. The throttle block is provided with a through hole that penetrates along its thickness direction, and the water outlet end of the return water channel can be connected to the cold water channel through the through hole.

[0013] Preferably, there are a plurality of through holes, and the plurality of through holes are arranged at intervals along the circumferential direction of the throttling block.

[0014] Preferably, a one-way valve is provided in the return water channel.

[0015] Preferably, the one-way valve includes a one-way valve body, a valve ball and a second elastic member arranged in the one-way valve body, and the water inlet and water outlet of the one-way valve body are respectively connected to the return water channel; the valve ball is arranged at the water inlet end of the one-way valve body, one end of the second elastic member abuts against the valve ball, and the other end of the second elastic member abuts against the inner wall of the one-way valve body, and the diameter of the valve ball is larger than the inner diameter of the water inlet of the one-way valve body.

[0016] A water heater, characterized in that it includes an H valve as described in any one of the above preferred embodiments, and also includes a water inlet joint and a water outlet joint provided on the water heater, and a water inlet pipe and a water outlet pipe provided in the water heater, one end of the water inlet joint is connected to the cold water pipe, and the other end is connected to the water inlet pipe, one end of the water outlet joint is connected to the hot water pipe, and the other end is connected to the water outlet pipe; a return pump is also provided on the water inlet pipe, and when the return pump is working, it can drive the medium in the hot water channel to move toward the return water channel.

[0017] Preferably, a controller is further provided in the water heater, one end of the controller is wirelessly connected to the temperature sensor, and the other end of the controller is electrically connected to the control switch.

[0018] The beneficial effects of the present invention are mainly reflected in the following: the H-valve and water heater provided by the present invention, by arranging a temperature sensor at the H-valve, can monitor the return water temperature at the H-valve in real time during the preheating process, thereby achieving the effect of precise temperature control; at the same time, by moving the moving part back and forth between the water outlet end of the return water channel and the control switch, the driving source can work in the preheating state and cut off the power when the preheating stops, which reduces the loss to the battery, lowers the power consumption, increases the battery life, avoids the user from frequently replacing the battery, and is more energy-saving and environmentally friendly. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The above and other purposes, features and advantages of the present invention will become more apparent through a more detailed description of the preferred embodiments of the present invention shown in the accompanying drawings. The same reference numerals indicate the same parts throughout the drawings, and the drawings are not intentionally scaled to actual size. The emphasis is on illustrating the subject matter of the present invention.

[0020] Figure 1 This is a schematic diagram of the cross-sectional structure of the H valve in the present utility model from the first perspective;

[0021] Figure 2 for Figure 1 A partial enlarged schematic diagram of area A in the middle;

[0022] Figure 3 This is a schematic diagram of the cross-sectional structure of the H valve in the present invention when the preheating function is turned on from a second perspective;

[0023] Figure 4 This is a schematic diagram of the throttle block in the present invention from a first perspective;

[0024] In the figure: 1-valve body, 10-cold water pipe, 101-cold water channel, 11-hot water pipe, 110-hot water channel, 12-connecting pipe, 120-water inlet, 13-casing, 130-water outlet, 14-return water channel, 15-throttling block, 150-through hole, 16-check valve;

[0025] 2-force-applying component, 20-moving part, 201-step surface, 21-elastic part, 22-end cover, 220-installation cavity, 23-sealing gasket, 230-inclined part;

[0026] 3-power unit, 30-control switch, 31-drive source;

[0027] 4- Temperature sensor. DETAILED DESCRIPTION

[0028] In order to facilitate understanding of the present invention, the present invention will be described more comprehensively below with reference to the relevant drawings.

[0029] It should be noted that when an element is considered to be "connected" to another element, it may be directly connected to the other element and integrated therewith, or there may be an intermediate element. The terms "mounted", "one end", "the other end" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meanings as those commonly understood by those skilled in the art. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present invention. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0031] refer to Figure 1-4 The utility model provides an H valve, comprising a valve body 1, and a force-applying assembly 2, a power unit 3, and a temperature sensor 4 provided on one side of the valve body 1. The force-applying assembly 2 comprises a moving part 20;

[0032] The valve body 1 includes a hot water channel 110, a cold water channel 101, and a return water channel 14. The water inlet end 120 and the water outlet end 130 of the return water channel 14 can be communicated with the hot water channel 110 and the cold water channel 101 respectively;

[0033] The power unit 3 includes a driving source 31 and a control switch 30. The control switch 30 and the temperature sensor 4 are both electrically connected to the driving source 31. The temperature sensor 4 is arranged in the cold water channel 101 or the hot water channel 110. The moving member 20 is arranged between the water outlet end 130 of the return water channel 14 and the control switch 30, and the moving member 20 can move between the water outlet end 130 of the return water channel 14 and the control switch 30. In this embodiment, the control switch 30 is preferably a micro switch, and the driving source 31 can be a battery. The driving source 31 mainly provides electricity for the control switch 30 and the temperature sensor 4. By arranging the temperature sensor 4 at the H valve, the temperature sensor 4 can better detect the temperature of the return water, and it is also more conducive to monitoring the state of the circulating water circuit.

[0034] When the moving part 20 moves to the water outlet end 130 away from the return water channel 14, the moving part 20 can touch the control switch 30, and a flow gap is formed between the moving part 20 and the water outlet end 130 of the return water channel 14, and the water outlet end 130 of the return water channel 14 is connected to the cold water channel 101; when the moving part 20 moves to the water outlet end 130 against the return water channel 14, the moving part 20 closes the water outlet end 130 of the return water channel 14, and the moving part 20 is disconnected from the control switch 30.

[0035] The specific working process of the H valve provided by the utility model is as follows:

[0036] When the preheating function of the water heater is turned on, the medium (water) in the hot water channel 110 moves in the direction of the return water channel 14. Under the action of water pressure, the water flow pushes the moving part 20 to move in the direction of the control switch 30 until the moving part 20 touches the control switch 30. At this time, a gap is generated between the moving part 20 and the water outlet end 130 of the return water channel 14, and the water flows through the return water channel 14 to the cold water channel 101 and returns to the water heater body for heating; also under the action of water pressure, the moving part 20 applies a certain pressure to the control switch 30, thereby closing the control switch 30. At this time, the temperature sensor 4 is in working state and monitors the water temperature in the cold water channel 101 / hot water channel 110 in real time. When the temperature sensor 4 detects that the circulating water temperature reaches the preset water temperature, the controller controls the control switch 30 to be disconnected, and the preheating function stops; at this time, the moving part 20 moves in the direction away from the control switch 30 until it hits the water outlet end 130 of the return water channel 14, closing the water outlet end 130 of the return water channel 14.

[0037] The H valve provided by the utility model has the following beneficial effects:

[0038] By setting a temperature sensor 4 at the H valve, the return water temperature at the H valve can be monitored in real time during the preheating process, thereby achieving a precise temperature control effect; at the same time, by moving the moving part 20 back and forth between the water outlet end 130 of the return water channel 14 and the control switch 30, the driving source 31 works in the preheating state and cuts off the power when the preheating stops, which reduces the loss to the battery, lowers the power consumption, increases the battery life, avoids the user from frequently replacing the battery, and is more energy-saving and environmentally friendly.

[0039] refer to Figure 1 and 2 In a preferred embodiment, the force-applying assembly 2 also includes an elastic member 21 (such as a spring) and an end cover 22. The end cover 22 is fixed to the valve body 1 and has an installation cavity 220 formed therein. The moving member 20 and the elastic member 21 are both arranged in the installation cavity 220; the elastic member 21 is sleeved on the outside of the moving member 20, and a step surface 201 is provided at one end of the moving member 20 close to the valve body 1, that is, a step surface 201 is provided at one end of the moving member 20 close to the water outlet end 130 of the return water channel 14, one end of the elastic member 21 abuts against the step surface 201, and the other end of the elastic member 21 abuts against the inner wall of the end cover 22. Specifically, the elastic member 21 is clamped between the step surface 201 and the inner wall of the end cover 22. When the movable member 20 moves toward the control switch 30, the elastic member 21 is driven to contract. When the temperature of the circulating water reaches the set temperature, the control switch 30 is disconnected. At this time, the elastic member 21 is reset under its own elastic action, and at the same time, it also drives the movable member 20 to move toward the water outlet end 130 of the return water channel 14.

[0040] refer to Figure 1 and 2In a preferred embodiment, the force-applying assembly 2 further includes an end cover 22 and a sealing rubber gasket 23. The movable member 20 is located in the end cover 22. The sealing rubber gasket 23 is at least partially clamped between the valve body 1 and the end cover 22. The sealing rubber gasket 23 is located between the water outlet end 130 of the return water channel 14 and the movable member 20. Figure 2 When the moving member 20 closes the outlet end 130 of the return water channel 14, the sealing rubber pad 23 abuts against the outlet end 130 of the return water channel 14, and the sealing rubber pad 23 extends along its radial direction to form an inclined portion 230; Figure 3 When the moving member 20 moves to the outlet end 130 away from the return water channel 14, a flow gap is formed between the sealing gasket 23 and the outlet end 130 of the return water channel 14, and the inclined portion 230 of the sealing gasket 23 changes from an inclined state to a straight state.

[0041] refer to Figure 1 and 3 Specifically, when the preheating function is not turned on, the medium in the hot water channel 110 has not yet moved toward the return water channel 14. The sealing gasket 23 abuts between the water outlet end 130 of the return water channel 14 and the movable member 20, and closes the water outlet end 130 of the return water channel 14. At this time, the medium cannot flow into the cold water channel 101. The sealing gasket 23 extends along its radial direction to form an inclined portion 230. When the user uses cold water, when water flows through the sealing gasket 23, the force exerted by the water flow on the movable member 20 can be reduced under the action of the inclined portion 230. At this time, the force on the sealing gasket 23 is:

[0042] P 冷 *S 冷 <F 弹 , P represents pressure, S represents the force area of ​​the sealing pad 23, and F represents the elastic force of the spring (hereinafter the same reason, no more details); through the design of this inclined surface, the force of the water flow on the movable member 20 can be weakened, thereby preventing the movable member 20 from triggering the control switch 30, and avoiding the situation that the preheating function is mistakenly started when the user uses cold water. When the preheating function is turned on, the medium of the hot water channel 110 moves in the direction of the return channel 14. At this time, the medium can move in the direction of the movable member 20, and under the action of the water pressure, the water flow pushes the sealing pad 23 to move forward (herein, forward refers to the movement in the direction of the movable member 20). The inclined portion 230 of the sealing pad 23 is deformed and converted from an inclined state to a straight state. At this time, there is a gap between the sealing pad 23 and the water outlet end 130 of the return channel 14. The medium can flow from the return channel 14 to the cold water channel 101 through the gap, and then return to the water heater body for heating, which is more flexible and convenient.

[0043] refer to Figure 1In a preferred embodiment, the valve body 1 includes a cold water pipe 10, a hot water pipe 11 and a connecting pipe 12, the two ends of the connecting pipe 12 are respectively connected to the cold water pipe 10 and the hot water pipe 11, and the cold water channel 101 and the hot water channel 110 are respectively arranged in the cold water pipe 10 and the hot water pipe 11; the valve body 1 also includes a sleeve 13, the sleeve 13 is located in the valve body 1 and is connected to the connecting pipe 12, one end of the sleeve 13 is connected to the inner wall of the connecting pipe 12, and the other end of the sleeve 13 passes through the cold water channel 101 and extends toward the direction of the force-applying component 2; the water inlet end 120 of the return water channel 14 is provided on the connecting pipe 12, and the water outlet end 130 of the return water channel 14 is provided on the sleeve 13.

[0044] refer to Figure 1-4 In a preferred embodiment, the valve body 1 further comprises a throttle block 15, which is sleeved on the outside of the sleeve 13 and located at one end of the sleeve 13 close to the force-applying component 2. The outer surface of the throttle block 15 abuts against the inner wall of the valve body 1. Figure 2 In this embodiment, the outer surface refers to the side of the throttle block 15 close to the inner wall of the valve body 1, and the inner surface refers to the side that abuts against the outer wall of the sleeve 13; the throttle block 15 is provided with a through hole 150 that penetrates along its thickness direction, and the water outlet end 130 of the return water channel 14 can be connected to the cold water channel 101 through the through hole 150. In this embodiment, by adding the throttle block 15, the force area of ​​the sealing gasket 23 is further reduced. Then, when the user uses cold water, it can be avoided that the water flow in the cold water channel 101 exerts too much force on the sealing gasket 23, causing the moving part 20 to mistakenly trigger the control switch 30. Only when the preheating function is turned on, the water flow moves from the hot water channel 110 to the cold water channel 101. At this time, the force exerted by the water flow in the return water channel 14 on the sealing gasket 23 reaches the maximum, that is, the force on the sealing gasket 23 is: P 热 *S 热 >F 弹 Only then can the moving part 20 be pushed under the action of water pressure to trigger the control switch 30 to close.

[0045] refer to Figure 4 In a preferred embodiment, there are multiple through holes 150, and the multiple through holes 150 are spaced apart along the circumferential direction of the throttle block 15. The design of multiple through holes 150 can speed up the speed at which the water in the return channel 14 flows back to the cold water channel 101.

[0046] refer to Figure 1 In a preferred embodiment, a one-way valve 16 is provided in the return water channel 14. The one-way valve 16 can prevent the cold water in the cold water channel 101 from flowing into the hot water channel 110, that is, when the water returns, the water can only flow from the hot water channel 110 to the cold water channel 101.

[0047] In a preferred embodiment, the one-way valve 16 includes a one-way valve body 16, a valve ball (not shown) and a second elastic member 21 (not shown) disposed within the one-way valve body 16. The water inlet and water outlet of the one-way valve body 16 are respectively connected to the return water channel 14. The valve ball is disposed at the water inlet end of the one-way valve body 16. One end of the second elastic member 21 abuts against the valve ball, and the other end of the second elastic member 21 abuts against the inner wall of the one-way valve body 16. The diameter of the valve ball is greater than the inner diameter of the water inlet of the one-way valve body 16. In this embodiment, the structure of the one-way valve 16 can be referred to the patent document previously applied for by the applicant, publication number CN114183693A. The structures of the two are substantially the same. The structure of the one-way valve 16 is not within the scope of protection of the invention of this application and is therefore not elaborated in detail.

[0048] A water heater (not shown) is characterized by comprising an H valve as in any one of the above preferred embodiments, further comprising a water inlet joint and a water outlet joint provided on the water heater, and a water inlet pipe and a water outlet pipe provided inside the water heater, wherein one end of the water inlet joint is connected to the cold water pipe 10 and the other end is connected to the water inlet pipe, and one end of the water outlet joint is connected to the hot water pipe 11 and the other end is connected to the water outlet pipe; a return water pump is also provided on the water inlet pipe, which, when in operation, can drive the medium in the hot water channel 110 to move toward the return water channel 14. When the preheating function is turned on, the return water pump operates to pump the water in the hot water channel 110 back into the water heater body for heating, referring to FIG. Figure 3 At this time, the direction of water flow is: from the hot water channel 110 to the return water channel 14, and when it reaches the water outlet 130 of the return water channel 14, it pushes the sealing gasket 23, so that the inclined portion 230 of the sealing gasket 23 changes from an inclined state to a straight state, and a gap is generated between the sealing gasket 23 and the water outlet 130 of the return water channel 14. Then the water flows through the through hole 150 of the throttle block 15 to the cold water channel 101, and finally is heated through the water inlet pipe in the water heater. After heating, it flows back to the hot water channel 110 from the water outlet pipe, and the cycle continues. Figure 3 The direction indicated by the arrow is the direction of water flow).

[0049] In a preferred embodiment, the water heater is further provided with a controller (not shown), one end of which is wirelessly connected to the temperature sensor 4 (specifically, via Bluetooth or other means), and the other end of which is electrically connected to the control switch 30. The temperature sensor 4 feeds back the detected temperature result to the controller, and when the detected temperature reaches a preset temperature, the control switch 30 is controlled to be disconnected.

[0050] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An H valve, characterized in that: It includes a valve body, a force-applying assembly, a power unit, and a temperature sensor provided on one side of the valve body, wherein the force-applying assembly includes a moving part; The valve body includes a hot water channel, a cold water channel, and a return water channel, and the water inlet and outlet of the return water channel can be communicated with the hot water channel and the cold water channel respectively; The power unit includes a driving source and a control switch, the control switch and a temperature sensor are both electrically connected to the driving source, and the temperature sensor is disposed in the cold water channel or the hot water channel; the moving member is disposed between the water outlet end of the return water channel and the control switch, and the moving member can move between the water outlet end of the return water channel and the control switch; When the moving part moves to a position away from the water outlet end of the return water channel, the moving part may touch the control switch, and a flow gap is formed between the moving part and the water outlet end of the return water channel, and the water outlet end of the return water channel is connected to the cold water channel; when the moving part moves to a position against the water outlet end of the return water channel, the moving part closes the water outlet end of the return water channel, and the moving part is disconnected from the control switch.

2. The H valve according to claim 1, characterized in that The force-applying assembly also includes an elastic member and an end cover. The end cover is fixed to the valve body and has an installation cavity formed therein. The movable member and the elastic member are both arranged in the installation cavity. The elastic member is sleeved on the outside of the movable member. A step surface is provided at one end of the movable member close to the valve body. One end of the elastic member abuts against the step surface, and the other end of the elastic member abuts against the inner wall of the end cover.

3. The H valve according to claim 1, characterized in that The force-applying assembly also includes an end cover and a sealing gasket, the movable part is located inside the end cover, the sealing gasket is at least partially clamped between the valve body and the end cover, and the sealing gasket is located between the water outlet end of the return water channel and the movable part; when the movable part closes the water outlet end of the return water channel, the sealing gasket abuts against the water outlet end of the return water channel, and the sealing gasket extends along its radial direction to form an inclined portion; when the movable part moves to a place away from the water outlet end of the return water channel, the flow gap is formed between the sealing gasket and the water outlet end of the return water channel, and the inclined portion of the sealing gasket changes from an inclined state to a straight state.

4. The H valve according to claim 1, characterized in that The valve body includes a cold water pipe, a hot water pipe and a connecting pipe, the two ends of the connecting pipe are respectively connected to the cold water pipe and the hot water pipe, and the cold water channel and the hot water channel are respectively arranged in the cold water pipe and the hot water pipe; the valve body also includes a sleeve, which is located in the valve body and connected to the connecting pipe, one end of the sleeve is connected to the inner wall of the connecting pipe, and the other end of the sleeve passes through the cold water channel and extends toward the direction of the force-applying component; the water inlet end of the return water channel is arranged on the connecting pipe, and the water outlet end of the return water channel is arranged on the sleeve.

5. The H valve according to claim 4, characterized in that The valve body also includes a throttle block, which is sleeved on the outside of the sleeve and located at one end of the sleeve close to the force-applying component. The outer surface of the throttle block abuts against the inner wall of the valve body. The throttle block is provided with a through hole that penetrates along its thickness direction. The water outlet end of the return water channel can be connected to the cold water channel through the through hole.

6. The H valve according to claim 5, characterized in that There are a plurality of through holes, and the plurality of through holes are arranged at intervals along the circumferential direction of the throttle block.

7. The H valve according to claim 1, characterized in that A one-way valve is arranged in the return water channel.

8. The H valve according to claim 7, characterized in that The one-way valve includes a one-way valve body, a valve ball and a second elastic member arranged in the one-way valve body, the water inlet and water outlet of the one-way valve body are respectively connected to the return water channel; the valve ball is arranged at the water inlet end of the one-way valve body, one end of the second elastic member abuts against the valve ball, and the other end of the second elastic member abuts against the inner wall of the one-way valve body, and the diameter of the valve ball is larger than the inner diameter of the water inlet of the one-way valve body.

9. A water heater, characterized in that: It includes the H valve as described in any one of claims 1 to 8 above, and also includes a water inlet joint and a water outlet joint provided on the water heater, and a water inlet pipe and a water outlet pipe provided in the water heater, one end of the water inlet joint is connected to the cold water pipe, and the other end is connected to the water inlet pipe, one end of the water outlet joint is connected to the hot water pipe, and the other end is connected to the water outlet pipe; a return pump is also provided on the water inlet pipe, and when the return pump is working, it can drive the medium in the hot water channel to move toward the return water channel.

10. The water heater according to claim 9, wherein The water heater is further provided with a controller, one end of the controller is wirelessly connected to the temperature sensor, and the other end is electrically connected to the control switch.

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