Return water valve and water supply system

Abstract

The present invention discloses a return water valve and a water supply system. The return water valve includes a valve body, a check valve, a first elastic member, and a temperature control assembly. The valve body has a first flow channel, a second flow channel, and a third flow channel; the check valve is movably installed in the third flow channel to block the third flow channel in the initial position; the first elastic member gives the check valve a tendency to reset; the temperature control assembly includes a regulating valve core movably disposed in the valve body. The check valve is configured to move in a direction close to the regulating valve core when the water pressure difference between the first flow channel and the second flow channel increases to a preset pressure difference to open the third flow channel; the regulating valve core is configured to move in a direction close to the check valve when the water temperature in the valve body rises to a preset temperature, so as to drive the check valve core of the check valve that has left the initial position to move and open the check valve. Thus, the return water valve is installed in the water circuit of the water supply system, and a return water circuit can be formed, so that the water supply system has the zero cold water function.

Description

Technical Field

[0001] The present invention relates to the technical field of zero - cold - water water supply, and particularly relates to a return water valve and a water supply system. Background Art

[0002] A water supply system, such as a water heater water supply system or a wall - hung boiler water supply system, etc., is used to provide water for users. It generally includes a gas heating device (such as a gas water heater or a wall - hung boiler, etc.), a cold water pipe, a hot water pipe, a mixing device, and a water outlet end. The water outlet end is connected to the gas heating device through the cold water pipe, the hot water pipe, and the mixing device.

[0003] In the related art, in order to enable the water supply system to have the zero - cold - water function, a return water valve with a check valve is usually added in the water supply system. The return water valve is connected in the cold water pipe and the hot water pipe to form a return water waterway in the water supply system. Summary of the Invention

[0004] The main object of the present invention is to propose a new return water valve for forming a return water waterway in a water supply system.

[0005] To achieve the above object, the present invention proposes a return water valve, which includes:

[0006] A valve body having a first flow channel and a second flow channel arranged at intervals, and a third flow channel communicating the first flow channel and the second flow channel;

[0007] A check valve movably installed in the third flow channel, and the check valve blocks the third flow channel in the initial position;

[0008] A first elastic member for making the check valve have a tendency to reset to the initial position; and

[0009] A temperature control assembly including a regulating valve core located on the water outlet side of the check valve, and the regulating valve core is movably arranged in the valve body in a direction away from or close to the check valve;

[0010] Wherein, the check valve is used to move in a direction close to the regulating valve core when the water pressure difference between the first flow channel and the second flow channel increases to a preset pressure difference to open the third flow channel; the regulating valve core is used to move in a direction close to the check valve when the water temperature in the valve body rises to a preset temperature, so as to drive the check valve core of the check valve that has left the initial position to move and open the check valve.

[0011] Optionally, the one-way valve includes a valve housing having a valve hole, and the one-way valve core is movably disposed in the valve hole. The one-way valve core closes the one-way valve in the closed position and is used to open the one-way valve when moving away from the closed position in a direction away from the regulating valve core;

[0012] When the one-way valve is in the initial position, there is an initial spacing between the one-way valve core and the regulating valve core. The initial spacing is less than the sum of the maximum movable distance of the regulating valve core and the maximum movable distance of the one-way valve, and is greater than or equal to the maximum movable distance of the regulating valve core.

[0013] Optionally, a first end of the one-way valve core extends out of a side of the valve housing facing the regulating valve core. When the one-way valve is in the initial position, the spacing between the first end of the one-way valve core and the regulating valve core is the initial spacing.

[0014] Optionally, the one-way valve further includes a second elastic member. Two ends of the second elastic member are respectively disposed on the valve housing and the one-way valve core to make the one-way valve core have a tendency to reset to the closed position; and / or,

[0015] The one-way valve core includes a main body portion and a valve core convex portion protruding from an outer peripheral surface of the main body portion. The main body portion is movably disposed in the valve hole. The valve core convex portion is located outside the valve housing and on a side of the valve housing away from the regulating valve core. When the one-way valve core is in the closed position, the valve core convex portion abuts against an outer surface of the valve housing.

[0016] Optionally, the one-way valve further includes a second elastic member. Two ends of the second elastic member are respectively disposed on the valve housing and the one-way valve core to make the one-way valve core have a tendency to reset to the closed position;

[0017] The one-way valve core includes a main body portion and a valve core convex portion protruding from an outer peripheral surface of the main body portion. The main body portion is movably disposed in the valve hole. The valve core convex portion is located outside the valve housing and on a side of the valve housing away from the regulating valve core. When the one-way valve core is in the closed position, the valve core convex portion abuts against an outer surface of the valve housing;

[0018] The second elastic member is a second spring. The second spring is sleeved outside the main body portion. Two ends of the second spring are respectively disposed on the valve housing and the main body portion to make the one-way valve core have a tendency to reset to the closed position.

[0019] Optionally, the second spring is a conical spring, and a limiting groove is formed on an outer peripheral surface of the main body portion. One end of the second spring is disposed in the limiting groove.

[0020] Optionally, the temperature control component further includes a valve core sleeve disposed in the third flow channel, and the regulating valve core is movably disposed in the valve core sleeve;

[0021] The first elastic member is a first spring sleeved outside the one-way valve, and two ends of the first spring are respectively disposed on the one-way valve and the valve core sleeve, so that the one-way valve has a tendency to reset to the initial position.

[0022] Optionally, an inner support is provided on the inner wall surface of the valve core sleeve. The inner support has an installation through hole. The first end of the regulating valve core is slidably installed in the installation through hole, the first end of the one-way valve core is slidably installed in the installation through hole, and the first end of the first spring is disposed on the inner support.

[0023] Optionally, the installation through hole is a stepped hole and includes an installation large hole and an installation small hole. The first end of the regulating valve core is slidably installed in the installation large hole, and the first end of the one-way valve core is slidably installed in the installation small hole.

[0024] Optionally, a first water passing structure is provided on the valve core sleeve, and / or a second water passing structure is provided on the regulating valve core, and / or a water passing gap is formed between the outer peripheral surface of the regulating valve core and the inner wall surface of the valve core sleeve.

[0025] Optionally, a gear position convex portion is convexly provided on the outer peripheral surface of the valve housing of the one-way valve. The first spring is located on the side of the gear position convex portion facing the regulating valve core, and one end of the first spring is disposed on the gear position convex portion.

[0026] Optionally, a sealing ring convex is formed on the inner wall surface of the third flow channel. When the one-way valve is in the initial position, the gear position convex portion abuts against the sealing ring convex;

[0027] The one-way valve further includes a sealing ring installed on the side of the gear position convex portion away from the regulating valve core. When the one-way valve is in the initial position, the sealing ring is clamped between the sealing ring convex and the gear position convex portion to block the third flow channel.

[0028] Optionally, a plurality of gear position convex portions are circumferentially spaced apart on the valve housing to open the third flow channel when the one-way valve leaves the initial position; or, the gear position convex portion is an annular convex portion, and a water passing hole is provided on the gear position convex portion to open the third flow channel when the one-way valve leaves the initial position; and / or

[0029] A water passing gap is provided between the end surface of the gear position convex portion and the inner wall surface of the third flow channel to open the third flow channel when the one-way valve leaves the initial position.

[0030] Optionally, the temperature control component further includes a temperature control driving component, which is installed in the valve body. The temperature control driving component is configured to drive the regulating valve core to move towards the check valve when the water temperature in the valve body rises to a preset temperature.

[0031] Optionally, the temperature control driving component includes a push rod, a temperature sensing shell, and a temperature sensing medium that expands when heated. The temperature sensing shell is located on the water outlet side of the check valve. The push rod is slidably installed in the temperature sensing shell, and the regulating valve core is installed at the outer end of the push rod. The temperature sensing medium is arranged in the temperature sensing shell. The temperature sensing medium is configured to expand when the water temperature in the valve body rises to a preset temperature, so as to make the push rod extend, and drive the regulating valve core to move towards the check valve. The temperature sensing medium is also configured to contract when cooled.

[0032] The present invention also provides a water supply system, including:

[0033] A gas heating device;

[0034] A water outlet end, which is connected to the gas water heater through a cold water pipe, a hot water pipe, and a water mixing device; and

[0035] The return water valve as described above, where the first flow channel of the return water valve is connected to the hot water pipe, and the second flow channel of the return water valve is connected to the cold water pipe.

[0036] Optionally, the gas heating device is a gas water heater or a gas wall-mounted boiler.

[0037] The present invention also provides a water supply system, including:

[0038] A gas heating device;

[0039] A water outlet end, which is connected to the gas water heater through a cold water pipe, a hot water pipe, and a water mixing device;

[0040] The return water valve as described above, where the second flow channel of the return water valve is connected to the cold water pipe or the water inlet pipe of the gas heating device; and

[0041] A return water pipe, one end of which is connected to the hot water pipe, and the other end is connected to the first flow channel of the return water valve.

[0042] In the present invention, the return water valve is installed in the water circuit of the water supply system, and a return water circuit can be formed, so that the water supply system has the zero cold water function; moreover, a relatively large preset pressure difference can be set to solve the problem that the hot water in the hot water pipe or the return water pipe of the water supply system is likely to flow into the cold water pipe through the return water valve when boosting and sending hot water. Description of the Drawings

[0043] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0044] Figure 1 Structural schematic diagram of an embodiment of the water supply system of the present invention;

[0045] Figure 2 Structural schematic diagram of another embodiment of the water supply system of the present invention;

[0046] Figure 3 Structural schematic diagram of an embodiment of the return water valve of the present invention;

[0047] Figure 4 For Figure 3 Structural schematic diagram when the return water valve in

[0048] Figure 5 For Figure 3 Structural schematic diagram when the return water valve in

[0049] Figure 6 For Figure 3 Structural schematic diagram when the return water valve in

[0050] Figure 7 For Figure 3 Explosion schematic diagram of the return water valve in

[0051] Figure 8 For Figure 7 Structural schematic diagram of the check valve in

[0052] Figure 9 For Figure 7 Structural schematic diagram of the regulating valve core in

[0053] Explanation of the reference numerals in the drawings:

[0054]

[0055]

[0056] The realization of the object, functional features and advantages of the present invention will be further described with reference to the embodiments and the drawings. Detailed implementation manners

[0057] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts belong to the scope of protection of the present invention.

[0058] It should be noted that if there are descriptions involving "first", "second", etc. in the embodiments of the present invention, such descriptions of "first", "second", etc. are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include at least one of such features.

[0059] In addition, the meaning of "and / or" appearing throughout the text is that it includes three parallel solutions. Taking "A and / or B" as an example, it includes solution A, or solution B, or a solution that satisfies both A and B simultaneously.

[0060] The present invention provides a return water valve and a water supply system.

[0061] Among them, as Figure 1 and 2 shown, the return water valve 100 is used for the water supply system 1000, that is, the water supply system 1000 includes the return water valve 100, so that the water supply system 1000 has a zero cold water function to achieve the functions of timed cruising and heat preservation. The return water valve 100 will be introduced in detail below in combination with the structure of the water supply system 1000. Optionally, the water supply system 1000 is a water heater water supply system 1000 (including but not limited to a gas water heater system) or a wall-mounted boiler water supply system 1000, etc. The following will take the gas water heater system as an example for illustration.

[0062] In the embodiments of the present invention, as Figure 1 and 2 shown, the water supply system 1000 further includes a gas heating device 200, a cold water pipe 300, a hot water pipe 400, a mixing device 600, a water outlet end 700, and a return water valve 100, etc. The water outlet end 700 is connected to the gas heating device 200 through the cold water pipe 300, the hot water pipe 400, and the mixing device 600; the return water valve 100 is installed in the water circuit of the water supply system 1000 to form a return water circuit to enable the water supply system 1000 to have a zero cold water function.

[0063] Specifically, as Figure 1 and 2 shown, the gas heating device 200 has a cold water inlet 201 and a hot water outlet 202, and the mixing device 600 has a hot water connection port, a cold water connection port, and a mixed water outlet port.

[0064] One end of the cold water pipe 300 and the cold water inlet 201 are both connected (i.e., communicated) with a water supply pipe (such as a tap water pipe, etc.), and the other end of the cold water pipe 300 is communicated with the cold water connection port; one end of the hot water pipe 400 is communicated with the hot water outlet 202, and the other end is communicated with the hot water connection port, and the mixed water outlet is communicated with the water outlet end 700. In this way, by adjusting the mixing device 600, the water outlet end 700 can send out cold water alone or send out mixed hot water with a suitable temperature.

[0065] Optionally, a cold water connector is provided at the cold water inlet 201; and / or, a hot water connector is provided at the hot water outlet 202.

[0066] Optionally, the water supply system 1000 includes a water inlet pipe 210. The cold water inlet 201 is communicated with the water supply pipe through the water inlet pipe 210, and the cold water pipe 300 is communicated with the water inlet pipe 210.

[0067] Optionally, the water outlet end 700 can be a shower head, a faucet, or the like.

[0068] Optionally, multiple water outlet ends 700 can be provided.

[0069] Optionally, the mixing device 600 is a mixing valve or other mixing device 600 with a similar function to the mixing valve.

[0070] Optionally, the gas heating device 200 is a gas water heater, a gas wall-mounted boiler, or the like. Hereinafter, a gas water heater will be taken as an example for description.

[0071] In an embodiment of the present invention, as Figures 3 - 9 shown, the return water valve 100 includes a valve body 10, a check valve 20, a first elastic member 50, and a temperature control assembly 30.

[0072] Specifically, as Figures 3 - 9 shown, the valve body 10 has a water flow channel, and the water flow channel includes a first flow channel 11 and a second flow channel 12 arranged at intervals, and a third flow channel 13 communicating the first flow channel 11 and the second flow channel 12.

[0073] Specifically, as Figures 3 - 9 shown, the check valve 20 is movably installed in the third flow channel 13, and the check valve 20 blocks the third flow channel 13 in the initial position.

[0074] Optionally, the check valve 20 is used to unidirectionally introduce the water in the first flow channel 11 into the second flow channel 12.

[0075] Specifically, as Figures 3 - 9As shown, the first elastic member 50 is used to make the one-way valve 20 tend to reset to the initial position, so that the one-way valve 20 can be normally in the initial position. Specifically, the first elastic member 50 is arranged in the water flow channel.

[0076] Specifically, as Figures 3 - 9 shown, the temperature control assembly 30 includes a regulating valve core 31. The regulating valve core 31 is located on the water outlet side of the one-way valve 20, and the regulating valve core 31 is movably arranged in the valve body 10 in a direction away from or close to the one-way valve 20.

[0077] Specifically, as Figures 3 - 9 shown, the one-way valve 20 is used to move in a direction close to the regulating valve core 31 when the water pressure difference between the first flow channel 11 and the second flow channel 12 increases to a preset pressure difference, so as to open the third flow channel 13; the regulating valve core 31 is used to move in a direction close to the one-way valve 20 when the water temperature in the valve body 10 rises to a preset temperature, so as to drive the one-way valve core 21 of the one-way valve 20 leaving the initial position to move, so as to open the one-way valve 20.

[0078] Specifically, the one-way valve 20 includes a valve housing 22 having a valve hole, and the one-way valve core 21 is movably arranged in the valve hole, so as to open or close the one-way valve 20 through one end of the one-way valve core 21.

[0079] Specifically, the one-way valve core 21 has a closed position for closing the one-way valve 20, that is, when the one-way valve core 21 is in the closed position, the one-way valve 20 is closed. And when the one-way valve core 21 moves away from the closed position, the one-way valve 20 can be opened. In this embodiment, the one-way valve core 21 is used to open the one-way valve 20 when moving away from the closed position in a direction away from the regulating valve core 31.

[0080] Among them, the one-way valve 20 is a normally closed switch. When the one-way valve 20 is closed, the water in the first flow channel 11 cannot flow through the one-way valve 20 to the second flow channel 12; after the one-way valve 20 is opened, the water in the first flow channel 11 can flow through the one-way valve 20 to the second flow channel 12.

[0081] It can be understood that when the one-way valve 20 is in the initial position and the one-way valve 20 is closed, the third flow channel 13 can be blocked to prevent the water in the first flow channel 11 from flowing to the second flow channel 12. But when the one-way valve 20 leaves the initial position and / or the one-way valve 20 is opened, the third flow channel 13 will be conducted, and the water in the first flow channel 11 can flow through the third flow channel 13 to the second flow channel 12.

[0082] In this embodiment, when the one-way valve 20 is in the initial position, there is an initial distance between the one-way valve core 21 and the regulating valve core 31. The initial distance is less than the sum of the maximum movable distance of the regulating valve core 31 and the maximum movable distance of the one-way valve 20, and greater than or equal to the maximum movable distance of the regulating valve core 31, so as to achieve: when the water temperature in the valve body 10 rises to a preset temperature, the regulating valve core 31 is used to move in the direction close to the one-way valve 20, so as to drive the one-way valve core 21 of the one-way valve 20 leaving the initial position to move, so as to open the one-way valve 20.

[0083] Specifically, when the one-way valve 20 moves in the direction close to the regulating valve core 31, the one-way valve core 21 can be moved to the movement track of the regulating valve core 31. In this way, by making the initial distance greater than or equal to the maximum movable distance of the regulating valve core 31, it can be avoided that the regulating valve core 31 drives the one-way valve core 21 of the one-way valve 20 in the initial position to move and accidentally open the one-way valve 20 when moving in the direction close to the one-way valve 20. And by making the initial distance less than the sum of the maximum movable distance of the regulating valve core 31 and the maximum movable distance of the one-way valve 20, the regulating valve core 31 can drive the one-way valve core 21 of the one-way valve 20 leaving the initial position to move when moving in the direction close to the one-way valve 20, so as to open the one-way valve 20.

[0084] Optionally, the initial distance is equal to the maximum movable distance of the regulating valve core 31.

[0085] Of course, in other embodiments, it can also be realized by other structural forms that "when the water temperature in the valve body 10 rises to a preset temperature, the regulating valve core 31 is used to move in the direction close to the one-way valve 20, so as to drive the one-way valve core 21 of the one-way valve 20 leaving the initial position to move, so as to open the one-way valve 20", such as a transmission structure (such as a lever structure, etc.) can be added between the regulating valve core 31 and the one-way valve core 21 to achieve this.

[0086] The function of the return water valve 100 will be described in detail below in combination with the structures of different water supply systems 1000.

[0087] In an embodiment of the water supply system 1000, the water supply system 1000 is not provided with a return water pipe 500; as Figure 1 shown, the first flow channel 11 is connected to the heat exchange pipe, the second flow channel 12 is connected to the cold water pipe 300, and when there are multiple water outlet ends 700, the return water valve 100 is optionally arranged at the most distal water outlet end 700.

[0088] Specifically, one end of the first flow channel 11 (such as Figure 1The B end (in it) is connected to the hot water inlet through the hot water pipe 400, and the other end of the first flow channel 11 (such as Figure 1 the A end in it) is connected to the hot water outlet 202 through the hot water pipe 400; one end of the second flow channel 12 (such as Figure 1 the C end in it) is connected to the cold water inlet through the cold water pipe 300, and the other end of the second flow channel 12 (such as Figure 1 the D end in it) is connected to the water inlet pipe 210 through the cold water pipe 300. In this way, a return water water path can be formed among the hot water pipe 400, the first flow channel 11, the third flow channel 13 and / or the fourth flow channel, the second flow channel 12, the cold water pipe 300, the water inlet pipe 210, the gas heating device 200, etc., and the return water valve 100 is arranged in this return water water path.

[0089] Of course, the above return water valve 100 can also be used in the water supply system 1000 with a return water pipe 500. For example, in another embodiment of the water supply system 1000 of the present invention, such as Figure 2 shown, the water supply system 1000 includes a return water pipe 500, one end of the return water pipe 500 is connected to the hot water pipe 400, and the other end is connected to one end of the first flow channel 11 (such as Figure 2 the A end in it), and the other end of the first flow channel 11 (such as Figure 2 the B end in it) is blocked (such as blocked by an end cap).

[0090] And in this embodiment, the second flow channel 12 is connected to the water inlet pipe 210 or the cold water pipe 300.

[0091] Optionally, as Figure 2 shown, the second flow channel 12 is connected to the water inlet pipe 210; specifically, one end of the second flow channel 12 (such as Figure 2 the C end in it) is connected to the cold water inlet 201 through the water inlet pipe 210, and the other end of the second flow channel 12 (such as Figure 2 the D end in it) is connected to the cold water pipe 300 through the water inlet pipe 210.

[0092] Optionally, the return water valve 100 is arranged close to the gas heating device 200.

[0093] And in this embodiment, when there are multiple water outlet ends 700, the return water pipe 500 is connected to the most distal water outlet end 700.

[0094] In this way, a return water water path can be formed among the hot water pipe 400, the return water pipe 500, the first flow channel 11, the third flow channel 13 and / or the fourth flow channel, the second flow channel 12, the water inlet pipe 210, and the heat exchanger of the gas heating device 200, etc.; the return water valve 100 is arranged in this return water water path.

[0095] Specifically, for the above two embodiments, such asFigure 1 and 2 As shown, the gas heating device 200 further includes a circulating water pump 800. The circulating water pump 800 is arranged in the return water circuit, and the circulating water pump 800 is used to drive water to flow in the return water circuit. Optionally, the circulating water pump 800 is arranged between the heat exchanger of the gas heating device 200 and the cold water inlet 201, so that the circulating water pump 800 can also be used to suck in cold water and / or boost water supply, etc.

[0096] Specifically, as Figure 4 shown, when the water supply system 1000 in the above two embodiments uses the zero cold water function for circulating preheating, the circulating water pump 800 will push the water in the return water circuit to flow, so that the water pressure in the first flow channel 11 increases, thereby increasing the difference between the water pressure in the first flow channel 11 and the water pressure in the second flow channel 12; when the water pressure difference between the first flow channel 11 and the second flow channel 12 increases to a preset pressure difference, the check valve 20 moves in the direction close to the regulating valve core 31 and leaves the initial position to open the third flow channel 13, so that the water in the first flow channel 11 can flow into the second flow channel 12 through the third flow channel 13, so that the water can circulate in the return water circuit to realize circulating preheating of the water in the hot water pipe 400, etc. At this time, as Figure 4 shown, the return water valve 100 is in the cold state circulating state, and the check valve core 21 of the check valve 20 is located on the moving track of the regulating valve core 31.

[0097] Please refer to Figure 5 together. When the water temperature in the hot water pipe 400 or the return water pipe 500 rises to a certain temperature but does not reach the expected preheating temperature (such as 100, etc.), and the water temperature in the valve body 10 (i.e., in the water flow channel, specifically at the temperature control component 30) rises to the preset temperature, the regulating valve core 31 moves in the direction close to the check valve 20. During the movement of the regulating valve core 31, it will act on (such as abutting or acting through a transmission structure) the check valve core 21 of the check valve 20 that has left the initial position, and drive the check valve core 21 to move (i.e., leave the closed position) to open the check valve 20. In this way, the circulating preheating can be continued, and the flow rate in the circulating water circuit can be increased to increase the preheating speed. At this time, as Figure 5 shown, the return water valve 100 is in the hot state circulating state.

[0098] Please refer to Figure 6, when hot water is supplied and pressurized at the water outlet 700 (i.e., when hot water is supplied under pressure), a circulation water pump 800 is used for pressurization to increase the water output and the water outlet speed. Due to the characteristic curve of the water pump, when the water pump is just started, the water pressure in the first flow channel 11 will increase rapidly, that is, the water pressure difference between the first flow channel 11 and the second flow channel 12 will increase; but after a period of time when it is started and the water supply flow rate at the water outlet 700 is large, the pressure difference between the inlet and outlet of the circulation water pump 800 will decrease, that is, the water pressure difference between the first flow channel 11 and the second flow channel 12 will decrease.

[0099] According to the above situation, the first elastic member 50 can be designed to make the preset pressure difference larger, so as to avoid the check valve 20 leaving the initial position when hot water is supplied under pressure, so as to achieve the effect of preventing water from flowing back when hot water is supplied under pressure. At this time, as Figure 6 shown, the return water valve 100 is in a hot state pressurization state.

[0100] Moreover, since "the regulating valve core 31 moves in the direction close to the check valve 20 when the water temperature in the valve body 10 rises to the preset temperature, so as to drive the check valve core 21 of the check valve 20 that has left the initial position to move, so as to open the check valve 20", that is, by increasing the preset pressure difference, the circulating preheating can continue.

[0101] It should be noted that the preset pressure difference can be adjusted by adjusting the elastic parameters of the first elastic member 50 itself or the initial elastic force value of the first elastic member 50 when the check valve 20 is in the initial position.

[0102] Therefore, in the present invention, the return water valve 100 is installed in the water circuit of the water supply system 1000, and a return water circuit can be formed, so that the water supply system 1000 has the zero cold water function; and the preset pressure difference can be made larger, so as to solve the problem that the hot water in the hot water pipe 400 or the return water pipe 500 of the water supply system 1000 is easily passed through the return water valve 100 and flows back into the cold water pipe 300 when hot water is supplied under pressure.

[0103] At the same time, optionally, the opening threshold of the check valve 20 can also be made larger to avoid accidentally opening the check valve 20 when cold water is supplied under pressure.

[0104] Furthermore, as Figures 3 - 9 shown, the first end of the check valve core 21 extends out of the valve housing 22 on the side facing the regulating valve core 31. When the check valve 20 is in the initial position, the distance between the first end of the check valve core 21 and the regulating valve core 31 is the initial distance.

[0105] In this way, the first end of the check valve core 21 extends outside the valve housing 22, so that the regulating valve core 31 can abut against the check valve core 21.

[0106] Of course, in other embodiments, one end of the regulating valve core 31 can also extend into the valve housing 22 and abut against the one-way valve core 21, etc.

[0107] Furthermore, as Figures 3 - 9 shown, the one-way valve 20 further includes a second elastic member 23. The two ends of the second elastic member 23 are respectively disposed on the valve housing 22 and the one-way valve core 21, so as to make the one-way valve core 21 have a tendency to reset to the closed position. In this way, the one-way valve 20 can be in a normally closed state.

[0108] Furthermore, as Figures 3 - 9 shown, the one-way valve core 21 includes a main body portion 211 and a valve core convex portion 212 protruding from the outer peripheral surface of the main body portion 211. The main body portion 211 is movably disposed in the valve hole. The valve core convex portion 212 is located outside the valve housing 22 and on the side of the valve housing 22 away from the regulating valve core 31. When the one-way valve core 21 is in the closed position, the valve core convex portion 212 abuts against the outer surface of the valve housing 22.

[0109] In this way, the one-way valve core 21 can be limited to the closed position, and the one-way valve core 21 can open the one-way valve 20 when leaving the closed position in the direction away from the regulating valve core 31.

[0110] Specifically, the valve core convex portion 212 abuts against the periphery of the valve hole.

[0111] Furthermore, as Figures 3 - 9 shown, the second elastic member 23 is a second spring. In this way, the structure can be simplified, and the performance of the spring is relatively stable, thereby improving the reliability. Of course, in other embodiments, the second elastic member 23 can also be provided with other elastic members such as an elastic pressing sheet, a rubber band, or a rib.

[0112] Specifically, as Figures 3 - 9 shown, the second spring is sleeved outside the main body portion 211. The two ends of the second spring are respectively disposed on the valve housing 22 and the main body portion 211, so as to make the one-way valve core 21 have a tendency to reset to the closed position. Optionally, the second spring is located on the side of the valve core convex portion 212 facing the regulating valve core 31.

[0113] In this way, not only the movement stability of the one-way valve core 21 can be improved, but also the space occupied in the movement direction of the one-way valve core 21 can be reduced.

[0114] Furthermore, as Figures 3 - 9 shown, the second spring is a conical spring, and a limiting groove is formed on the outer peripheral surface of the main body portion 211. One end of the second spring is disposed in the limiting groove.

[0115] Specifically, a stop step is formed on the inner wall surface of the valve hole, and the other end of the conical spring abuts against the stop step.

[0116] Of course, in other embodiments, a limit ring protrusion may also be provided on the inner wall surface of the valve hole to cooperate with the valve core protrusion 212 to achieve limit and sealing.

[0117] Further, as Figures 3 - 9 shown, the temperature control assembly 30 further includes a valve core sleeve 36. The valve core sleeve 36 is disposed in the third flow channel 13, and the regulating valve core 31 is movably disposed in the valve core sleeve 36.

[0118] Specifically, the valve core sleeve 36 is fixedly installed in the third flow channel 13, and the regulating valve core 31 is slidably disposed in the valve core sleeve 36.

[0119] Further, as Figures 3 - 9 shown, both ends of the first elastic member 50 are respectively disposed on the one-way valve 20 and the valve core sleeve 36, so that the one-way valve 20 has a tendency to reset to the initial position.

[0120] Specifically, as Figures 3 - 9 shown, the first elastic member 50 is a first spring. In this way, the structure can be simplified, and the performance of the spring is relatively stable, thereby improving the reliability.

[0121] Further, as Figures 3 - 9 shown, the first spring is sleeved outside the one-way valve 20, and both ends of the first spring are respectively disposed on the one-way valve 20 and the valve core sleeve 36, so that the one-way valve 20 has a tendency to reset to the initial position.

[0122] Specifically, the first spring sleeve is sleeved outside the valve housing 22, and both ends of the first spring are respectively disposed on the valve housing 22 and the valve core sleeve 36, so that the one-way valve 20 has a tendency to reset to the initial position.

[0123] In this way, not only the movement stability of the one-way valve 20 can be improved, but also the space occupied in the movement direction of the one-way valve 20 can be reduced.

[0124] Of course, in other embodiments, the first elastic member 50 may also be provided with an elastic pressing piece, or a rubber band, or other elastic members such as a pressed rib.

[0125] In a specific embodiment, to prevent the valve core sleeve 36 and the regulating valve core 31 from blocking the third flow channel 13, a first water passing structure may be provided on the valve core sleeve 36, and / or a second water passing structure may be provided on the regulating valve core 31, and / or a water passing gap may be formed between the outer peripheral surface of the regulating valve core 31 and the inner wall surface of the valve core sleeve 36, and / or a flow through gap may be provided between the valve core sleeve 36 and the inner wall surface of the third flow channel 13, and so on. Hereinafter, the case where the regulating valve core 31 is provided with a second water passing structure will be taken as an example for description.

[0126] Further, an inner support 361 is provided on the inner wall surface of the valve core sleeve 36. The inner support 361 has an installation through hole 3611. The first end of the regulating valve core 31 (i.e., the end facing the one-way valve 20) is slidably installed in the installation through hole 3611, and the first end of the first spring is provided on the inner support 361.

[0127] In this way, on the one hand, the stability of the movement of the regulating valve core 31 can be improved, and on the other hand, it is also convenient to arrange the first spring.

[0128] It can be understood that the inner support 361 has a water passing through hole.

[0129] Further, as Figures 3 - 9 shown, the first end of the one-way valve core 21 is slidably installed in the installation through hole 3611. In this way, on the one hand, the stability of the movement of the one-way valve core 21 can be improved, and on the other hand, it is also convenient for the regulating valve core 31 to drive the one-way valve core 21 to move.

[0130] Specifically, the one-way valve core 21 further includes a guiding portion 213 provided at one end of the main body portion 211 (i.e., the end facing the regulating valve core 31). The guiding portion 213 is slidably installed in the installation through hole 3611. Among them, the guiding portion 213 is used to form the first end of the one-way valve core 21.

[0131] Further, as Figures 3 - 9 shown, the installation through hole 3611 is a stepped hole and includes an installation large hole and an installation small hole. The first end of the regulating valve core 31 is slidably installed in the installation large hole, and the first end of the one-way valve core 21 is slidably installed in the installation small hole.

[0132] Specifically, the guiding portion 213 is slidably installed in the installation small hole.

[0133] In this way, by making the installation through hole 3611 a stepped hole, at least the movement of the regulating valve core 31 can be limited.

[0134] Further, as Figures 3 - 9 shown, the main body portion 211 and the guiding portion 213 form a stepped structure to at least be used for limiting the movement of the one-way valve core 21.

[0135] Further, as Figures 3 - 9 shown, a gear position convex part 221 protrudes from the outer peripheral surface of the valve housing 22, the first spring is located on one side of the gear position convex part 221 facing the regulating valve core 31, and one end of the first spring is arranged on the gear position convex part 221. Specifically, one end of the first spring abuts against the gear position convex part 221.

[0136] In this way, both elastic ends of the first spring can abut against the gear position convex part 221 and the inner support 361 respectively, so that the first spring is in a compressed state, and the one-way valve 20 has a tendency to reset to the initial position.

[0137] Further, as Figures 3 - 9 shown, a sealing ring convex part 131 is formed on the inner wall surface of the third flow channel 13. When the one-way valve 20 is in the initial position, the gear position convex part 221 abuts against the sealing ring convex part 131. In this way, the one-way valve 20 can be limited to the initial position.

[0138] Further, as Figures 3 - 9 shown, the one-way valve 20 further includes a sealing ring 24. The sealing ring 24 is installed on the side of the gear position convex part 221 away from the regulating valve core 31. When the one-way valve 20 is in the initial position, the sealing ring 24 is clamped between the sealing ring convex part 131 and the gear position convex part 221 to block the third flow channel 13.

[0139] Optionally, the gear position convex part 221 is arranged at one end of the valve housing 22 away from the regulating valve core 31.

[0140] Further, as Figures 3 - 9 shown, a plurality of the gear position convex parts 221 are distributed at intervals in the circumferential direction of the valve housing 22 to open the third flow channel 13 when the one-way valve 20 leaves the initial position; or, the gear position convex part 221 is an annular convex part, and a water passing hole is provided on the gear position convex part 221 to open the third flow channel 13 when the one-way valve 20 leaves the initial position; and / or,

[0141] a water passing gap is provided between the end surface of the gear position convex part 221 and the inner wall surface of the third flow channel 13 to open the third flow channel 13 when the one-way valve 20 leaves the initial position.

[0142] In this way, the third flow channel 13 can be opened when the one-way valve 20 leaves the initial position.

[0143] In this embodiment, a plurality of gear convex portions 221 are distributed at intervals in the circumferential direction of the valve housing 22, and there is a water passage interval between two adjacent gear convex portions 221. The annular protrusion formed by the plurality of gear convex portions 221 is slidably installed in the third flow passage 13 to improve the movement stability of the valve housing 22.

[0144] Of course, in other embodiments, a sealing convex portion may be provided on the circumferential surface of the valve housing 22 and on the side of the gear convex portion 221 away from the regulating valve core 31 to cooperate with the sealing ring convex 131.

[0145] Furthermore, as Figures 3 - 9 shown, when the one-way valve core 21 is in the closed position, the sealing ring 24 is clamped between the valve core convex portion 212 and the valve housing 22 to close the one-way valve 20.

[0146] Of course, in other embodiments, other sealing rings 24 may also be additionally provided on the valve core convex portion 212 to close the one-way valve 20.

[0147] Specifically, as Figures 3 - 9 shown, the temperature control assembly 30 further includes a temperature control driving assembly 32. The temperature control driving assembly 32 is installed in the valve body 10 (i.e., in the water flow passage), and the temperature control driving assembly 32 is configured to drive the regulating valve core 31 to move toward the one-way valve 20 when the water temperature in the valve body 10 (i.e., in the water flow passage) rises to a preset temperature.

[0148] Furthermore, as Figures 3 - 9 shown, the temperature control driving assembly 32 includes a push rod 321, a temperature sensing housing 322, and a temperature sensing medium 323 that expands when heated. The temperature sensing housing 322 is located on the water outlet side of the one-way valve 20. The push rod 321 is slidably installed in the temperature sensing housing 322, and the regulating valve core 31 is installed at the outer end of the push rod 321. The temperature sensing medium 323 is disposed in the temperature sensing housing 322. The temperature sensing medium 323 is configured to expand when the water temperature in the water flow passage rises to a preset temperature, so as to cause the push rod 321 to extend, thereby driving the regulating valve core 31 to move toward the one-way valve 20. The temperature sensing medium 323 is also configured to contract when cooled.

[0149] Specifically, the temperature sensing medium 323 expands when the water temperature at the valve housing 22 rises to a preset temperature, thereby driving the push rod 321 to slide and causing the push rod 321 to extend. When the water temperature at the temperature sensing reaction portion drops below the preset temperature, the temperature sensing medium 323 contracts, so that the push rod 321 can be reset along with the temperature sensing medium 323 or under the drive of other resetting members.

[0150] Among them, the temperature control driving component 32 is a temperature bulb component, that is, the temperature sensing shell 322 and the temperature sensing medium 323 inside the temperature sensing shell 322 form a temperature bulb, and together with the ejector rod 321, etc., they form a temperature bulb component.

[0151] Optionally, the temperature sensing medium 323 is paraffin, or methanol, or toluene, etc. It should be noted that the size of the preset temperature is related to the selection of the temperature sensing medium 323. For example, when the temperature sensing medium 323 is paraffin, the preset temperature can be 37 degrees, etc.

[0152] Furthermore, as Figures 3 - 9 shown, the temperature control driving component 32 further includes a third elastic member 324, and the third elastic member 324 is used to make the regulating valve core 31 have a tendency to reset to the initial position. In this way, when the temperature sensing medium 323 shrinks, the third elastic member 324 will drive the regulating valve core 31 and the ejector rod 321 to reset together, thereby improving the reliability and other performances of the return water valve 100.

[0153] In a specific embodiment, the third elastic member 324 can be selected as a spring, a spring sheet, or a rubber band, etc.

[0154] In this embodiment, as Figures 3 - 9 shown, the third elastic member 324 is a third spring. In this way, the structure can be simplified, and the performance of the spring is relatively stable, thereby improving the reliability.

[0155] Furthermore, as Figures 3 - 9 shown, the third spring is sleeved outside the regulating valve core 31, and both ends of the third spring are respectively arranged on the inner support 361 and the regulating valve core 31, so that the regulating valve core 31 has a tendency to reset. In this way, not only can the stability of the movement of the regulating valve core 31 be improved, but also the space occupied in the moving direction of the regulating valve core 31 can be reduced.

[0156] Furthermore, as Figures 3 - 9 shown, the regulating valve core 31 includes a valve core main body 311 and a limiting convex portion 313 protruding from the circumferential surface of the valve core main body 311, and both ends of the third spring are respectively arranged on the inner support 361 and the limiting convex portion 313, so that the regulating valve core 31 has a tendency to reset.

[0157] Specifically, both ends of the third spring respectively abut against the limiting convex portion 313 and the inner support 361, so that the third spring is in a compressed state, so that the limiting valve core has a tendency to reset.

[0158] Furthermore, as Figures 3 - 9 shown, an installation groove 314 is formed on the end surface of one end of the valve core main body 311 (i.e., the end facing the second flow channel 12), and the outer end of the ejector rod 321 is installed in the installation groove 314.

[0159] Further, as Figures 3 - 9 shown, a water through-hole 315 communicating with the installation groove 314 is provided on the valve core body 311.

[0160] Specifically, a plurality of the water through-holes 315 are circumferentially and spacedly distributed on the valve core body 311.

[0161] Specifically, the water through-hole 315 extends to the end face of one end of the valve core body 311 facing the second flow channel 12.

[0162] In this way, blocking of the third flow channel 13 can be prevented.

[0163] Further, as Figures 3 - 9 shown, the regulating valve core 31 further includes a sliding portion 312 provided at one end of the valve core body 311 (i.e., the end facing the one-way valve 20), and the sliding portion 312 is slidably installed in the installation through-hole 3611.

[0164] Specifically, the sliding portion 312 is used to form the first end of the regulating valve core 31, that is, the sliding portion 312 is slidably installed in the large installation hole.

[0165] Wherein, the sliding portion 312 and the valve core body 311 form a stepped structure for limiting the movement of the regulating valve core 31.

[0166] Specifically, the end of the sliding portion 312 (i.e., the end facing the one-way valve 20) is used to abut against the end of the guiding portion 213 for driving the one-way valve core 21 to move. Wherein, the distance between the end of the sliding portion 312 and the end of the guiding portion 213 in the moving direction of the one-way valve core 21 is the initial spacing.

[0167] Of course, in other embodiments, the temperature sensing driving assembly can also be set in other structural forms. For example, the temperature sensing driving assembly can further include a temperature sensing seat, a temperature sensing elastic piece and an elastic resetting piece provided on the temperature sensing seat, so that the regulating valve core 31 extends when the temperature sensing elastic piece deforms due to temperature increase, and the regulating valve core 31 retracts through the elastic resetting piece; and so on.

[0168] Of course, in other embodiments, a convex structure can also be provided on the inner wall surface of the third flow channel 13 for installing the first spring, the regulating valve core 31, the third spring, etc.

[0169] Further, as Figures 3 - 9As shown, the return water valve 100 further includes a fourth elastic member 40. The temperature control driving assembly 32 is movably disposed in the water flow channel. The fourth elastic member 40 is configured to make the temperature control driving assembly 32 tend to move in a direction close to the one-way valve 20. Specifically, the temperature sensing housing 322 is movably disposed in the water flow channel. The fourth elastic member 40 is configured to make the temperature sensing housing 322 tend to move in a direction close to the one-way valve 20.

[0170] Wherein, the movable directions of the regulating valve core 31 and the temperature sensing housing 322 should both be in a direction close to or away from the one-way valve 20.

[0171] It can be understood that the temperature control driving assembly 32 formed by using a temperature sensing medium 323 such as paraffin usually has the characteristic of temperature sensing delay, that is, after the temperature control driving assembly 32 drives the one-way valve 20 to move to the initial position of the one-way valve 20 through the regulating valve core 31, it still has a tendency to drive the regulating valve core 31 to move, which may damage the regulating valve core 31 and the like.

[0172] However, in the present invention, by movably disposing the temperature control driving assembly 32 in the water flow channel and providing the fourth elastic member 40 to make the temperature control driving assembly 32 tend to move in a direction close to the one-way valve 20, the adverse effects brought by the temperature sensing delay characteristic of the temperature sensing medium 323 such as paraffin can be eliminated.

[0173] Optionally, as Figures 3 - 9 shown, the fourth elastic member 40 is a fourth spring. Specifically, the fourth spring is sleeved outside the temperature sensing housing 322, and one end is connected to the inner wall surface of the water flow channel, and the other end is connected to the temperature sensing housing 322, so that the temperature sensing housing 322 has a tendency to move in a direction close to the one-way valve 20.

[0174] Optionally, the elastic coefficient of the third spring is less than the elastic coefficient of the fourth spring.

[0175] Furthermore, as Figures 3 - 9 shown, in order to improve the installation and movement stability of the temperature control driving assembly 32, the temperature control assembly 30 further includes a support frame 35. The support frame 35 is fixedly installed in the third flow channel 13, and the temperature control driving assembly 32 is installed on the support frame 35.

[0176] Specifically, the support frame 35 is provided with a support hole, and the temperature sensing housing 322 is slidably installed in the support hole, so that the temperature control driving assembly 32 is movably installed in the water flow channel. Wherein, the support frame 35 is located on a side of the valve core sleeve 36 away from the one-way valve 20.

[0177] Furthermore, as Figures 3 - 8As shown, the first flow channel 11 includes a first flow section 111. One end of the first flow section 111 is provided with a first flow channel port 11, and the other end of the first flow section 111 communicates with the third flow channel 13. Moreover, the extending direction of the first flow section 111 is the same as that of the third flow channel 13.

[0178] Optionally, a filter screen 70 is further provided at the first flow channel port 11.

[0179] Furthermore, as Figures 3 - 8 shown, the second flow channel 12 includes a second flow section 121. One end of the second flow section 121 is provided with a second flow channel port 12, and the other end of the second flow section 121 communicates with the third flow channel 13. Moreover, the extending direction of the second flow section 121 is the same as that of the third flow channel 13.

[0180] The temperature control component 30 is installed in the second flow section 121 and the third flow channel 13.

[0181] Optionally, as Figures 3 - 8 shown, the first flow section 111, the third flow channel 13, and the second flow section 121 are all straight flow channels, and the first flow section 111 and the second flow section 121 are respectively arranged at both ends of the third flow channel 13.

[0182] Furthermore, as Figures 3 - 8 shown, the first flow channel 11 further includes a third flow section 112 communicating with the first flow section 111. The connection part between the first flow section 111 and the third flow section 112 communicates with the third flow channel 13, and one end of the third flow section 112 is provided with a third flow channel port 13.

[0183] The second flow channel 12 further includes a fourth flow section 122 communicating with the second flow section 121. The connection part between the second flow section 121 and the fourth flow section 122 communicates with the third flow channel 13, and one end of the fourth flow section 122 is provided with a fourth flow channel port.

[0184] Of course, in other embodiments, the water flow channel can also be designed into other structural forms. For example, the first flow channel 11, the second flow channel 12, and the third flow channel 13 can form an H-shaped structure, etc.

[0185] Furthermore, as Figures 3 - 8 shown, the valve core sleeve 36 is arranged in the middle section of the third flow channel 13.

[0186] Furthermore, as Figure 3 and 7 shown, the valve body 10 includes a first valve body 10a and a second valve body 10b which are connected in cooperation. The first valve body 10a has the first flow channel 11 and a part of the third flow channel 13, and the second valve body 10b has the second flow channel 12 and a part of the third flow channel 13. In this way, it is convenient to assemble the return water valve 100.

[0187] Further, as Figure 3 and 7 shown, the first valve body 10a is detachably connected to the second valve body 10b.

[0188] Specifically, the first valve body 10a is snap-connected to the second valve body 10b.

[0189] Optionally, a snap ring 60 is provided at the snap connection between the first valve body 10a and the second valve body 10b.

[0190] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. Any equivalent structural transformation made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or direct / indirect application in other related technical fields, is included in the patent protection scope of the present invention.

Claims

1. A return water valve, characterized in that, The return water valve includes: A valve body having a first flow channel and a second flow channel arranged at intervals, and a third flow channel communicating the first flow channel and the second flow channel; A check valve movably installed in the third flow channel, and the check valve blocks the third flow channel at the initial position; A first elastic member for making the check valve have a tendency to reset to the initial position; and A temperature control assembly including a regulating valve core and a valve core sleeve. The valve core sleeve is arranged in the third flow channel, and the regulating valve core is movably arranged in the valve core sleeve; the regulating valve core is located on the water outlet side of the check valve, and the regulating valve core is movably arranged in the valve body in a direction away from or close to the check valve; the temperature control assembly further includes a temperature control driving assembly installed in the valve body, and the temperature control driving assembly is used for driving the regulating valve core to move in a direction close to the check valve when the water temperature in the valve body rises to a preset temperature; The check valve includes a valve housing having a valve hole, and the check valve core is movably arranged in the valve hole. The check valve core closes the check valve at the closed position and is used for opening the check valve when leaving the closed position in a direction away from the regulating valve core; When the check valve is in the initial position, there is an initial distance between the check valve core and the regulating valve core, and the initial distance is less than the sum of the maximum movable distance of the regulating valve core and the maximum movable distance of the check valve, and is greater than or equal to the maximum movable distance of the regulating valve core; Wherein, the check valve is used for moving in a direction close to the regulating valve core when the water pressure difference between the first flow channel and the second flow channel increases to a preset pressure difference to open the third flow channel; the regulating valve core is used for moving in a direction close to the check valve when the water temperature in the valve body rises to a preset temperature to drive the check valve core of the check valve leaving the initial position to move to open the check valve.

2. The water return valve according to claim 1, characterized in that, The first end of the check valve core extends out of the side of the valve housing facing the regulating valve core, and when the check valve is in the initial position, the distance between the first end of the check valve core and the regulating valve core is the initial distance.

3. The water return valve according to claim 2, characterized in that, The check valve further includes a second elastic member, and two ends of the second elastic member are respectively arranged on the valve housing and the check valve core to make the check valve core have a tendency to reset to the closed position; and / or The check valve core includes a main body portion and a valve core convex portion protruding from the outer peripheral surface of the main body portion. The main body portion is movably arranged in the valve hole, and the valve core convex portion is located outside the valve housing and on the side of the valve housing away from the regulating valve core. When the check valve core is in the closed position, the valve core convex portion abuts against the outer surface of the valve housing.

4. The return water valve according to claim 3, characterized in that, The check valve further includes a second elastic member, and two ends of the second elastic member are respectively arranged on the valve housing and the check valve core to make the check valve core have a tendency to reset to the closed position; The one-way valve core includes a main body portion and a valve core convex portion protruding from the outer peripheral surface of the main body portion. The main body portion is movably disposed in the valve hole. The valve core convex portion is located outside the valve housing and on the side of the valve housing away from the regulating valve core. When the one-way valve core is in the closed position, the valve core convex portion abuts against the outer surface of the valve housing; The second elastic member is a second spring. The second spring is sleeved outside the main body portion. Two ends of the second spring are respectively disposed on the valve housing and the main body portion, so that the one-way valve core has a tendency to reset to the closed position.

5. The return water valve according to claim 4, characterized in that, The second spring is a conical spring. A limiting groove is formed on the outer peripheral surface of the main body portion. One end of the second spring is disposed in the limiting groove.

6. The water return valve according to any one of claims 1 to 5, characterized in that The first elastic member is a first spring. The first spring is sleeved outside the one-way valve. Two ends of the first spring are respectively disposed on the one-way valve and the valve core sleeve, so that the one-way valve has a tendency to reset to the initial position.

7. The return water valve according to claim 6, characterized in that, An inner support is provided on the inner wall surface of the valve core sleeve. The inner support has a mounting through hole. The first end of the regulating valve core is slidably mounted in the mounting through hole. The first end of the one-way valve core is slidably mounted in the mounting through hole. The first end of the first spring is disposed on the inner support.

8. The return water valve according to claim 7, characterized in that, The mounting through hole is a stepped hole and includes a mounting large hole and a mounting small hole. The first end of the regulating valve core is slidably mounted in the mounting large hole. The first end of the one-way valve core is slidably mounted in the mounting small hole.

9. The return water valve according to claim 6, characterized in that, The valve core sleeve is provided with a first water passing structure, and / or the regulating valve core is provided with a second water passing structure, and / or a water passing gap is formed between the outer peripheral surface of the regulating valve core and the inner wall surface of the valve core sleeve.

10. The return water valve according to claim 6, characterized in that, A gear position convex portion protrudes from the outer peripheral surface of the valve housing of the one-way valve. The first spring is located on the side of the gear position convex portion facing the regulating valve core. One end of the first spring is disposed on the gear position convex portion.

11. The return water valve according to claim 10, characterized in that, A sealing ring convex is formed on the inner wall surface of the third flow channel. When the one-way valve is in the initial position, the gear position convex portion abuts against the sealing ring convex; The one-way valve further includes a sealing ring. The sealing ring is mounted on the side of the gear position convex portion away from the regulating valve core. When the one-way valve is in the initial position, the sealing ring is clamped between the sealing ring convex and the gear position convex portion to block the third flow channel.

12. The return water valve according to claim 11, characterized in that, A plurality of the gear position convex portions are circumferentially spaced apart on the valve housing to open the third flow channel when the one-way valve leaves the initial position; or, the gear position convex portion is an annular convex portion, and a water passing hole is provided on the gear position convex portion to open the third flow channel when the one-way valve leaves the initial position; and / or, A water passing gap is provided between the end surface of the gear position convex portion and the inner wall surface of the third flow channel to open the third flow channel when the one-way valve leaves the initial position.

13. The return water valve according to claim 1, characterized in that, The temperature control driving assembly includes a push rod, a temperature sensing shell, and a temperature sensing medium that expands when heated. The temperature sensing shell is located on the water outlet side of the one-way valve. The push rod is slidably installed in the temperature sensing shell, and the regulating valve core is installed at the outer end of the push rod. The temperature sensing medium is arranged in the temperature sensing shell. The temperature sensing medium is used to expand when the water temperature in the valve body rises to a preset temperature, so that the push rod extends out to drive the regulating valve core to move towards the direction close to the one-way valve. The temperature sensing medium is also used to contract when cooled.

14. A water supply system, characterized in that, Comprising: A gas heating device; A water outlet end, which is connected to the gas heating device through a cold water pipe, a hot water pipe, and a water mixing device; And The return water valve according to any one of claims 1 to 13, wherein the first flow channel of the return water valve is connected to the hot water pipe, and the second flow channel of the return water valve is connected to the cold water pipe.

15. The water supply system according to claim 14, wherein, The gas heating device is a gas water heater or a gas wall-mounted boiler.

16. A water supply system, characterized in that, Comprising: A gas heating device; A water outlet end, which is connected to the gas heating device through a cold water pipe, a hot water pipe, and a water mixing device; The return water valve according to any one of claims 1 to 13, wherein the second flow channel of the return water valve is connected to the cold water pipe or the water inlet pipe of the gas heating device; And A return water pipe, one end of which is connected to the hot water pipe, and the other end is connected to the first flow channel of the return water valve.

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