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 temperature control switch, a first check valve, and a second check valve. The valve body has a first flow channel and a second flow channel arranged at intervals, and a third flow channel and a fourth flow channel respectively communicating the first flow channel and the second flow channel. The temperature control switch is arranged in the valve body, and at least part of the temperature control switch is arranged in the third flow channel to block the third flow channel when the water temperature in the water flow channel rises to a preset temperature. The first check valve is at least partially arranged in the third flow channel to unidirectionally introduce the water in the first flow channel into the second flow channel. The second check valve is at least partially arranged in the fourth flow channel to unidirectionally introduce the water in the first flow channel into the second flow channel. In this way, the water supply system can not only realize the zero cold water supply function, but also prevent water backflow when pressurizing and sending hot water.

Description

Technical Field

[0001] The present invention relates to the technical field of zero - cold - water water supply, and particularly 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 related technologies, in order to enable the water supply system to have the zero - cold - water function, a return water valve with a one - way 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.

[0004] For the above - mentioned water supply system, in some cases, such as when the water outlet end of the water supply system uses hot water alone and pressurizes the water supply, the hot water in the hot water pipe or the return water pipe may flow into the cold water pipe through the one - way valve. Summary of the Invention

[0005] The main object of the present invention is to propose a return water valve, aiming to solve the technical problem that in related technologies, when the water outlet end of the water supply system uses hot water and pressurizes the water supply, the hot water in the hot water pipe or the return water pipe of the water supply system easily flows into the cold water pipe through the return water valve.

[0006] To achieve the above object, a return water valve proposed by the present invention includes:

[0007] A valve body, the valve body has a water flow channel, the water flow channel includes a first flow channel and a second flow channel arranged at intervals, and a third flow channel and a fourth flow channel respectively communicating the first flow channel and the second flow channel. The third flow channel and the fourth flow channel are arranged at intervals;

[0008] A temperature control switch, the temperature control switch is arranged in the water flow channel, and at least part of the temperature control switch is arranged in the third flow channel to block the third flow channel when the water temperature in the water flow channel rises to a preset temperature;

[0009] A first one - way valve, at least part of the first one - way valve is arranged in the third flow channel to unidirectionally introduce the water in the first flow channel into the second flow channel; and

[0010] A second one - way valve, at least part of the second one - way valve is arranged in the fourth flow channel to unidirectionally introduce the water in the first flow channel into the second flow channel.

[0011] Optionally, the temperature control switch includes a regulating valve core and a temperature control driving component. The regulating valve core is movably disposed in the third flow channel. The regulating valve core has an initial position for opening the third flow channel and a blocking position for blocking the third flow channel.

[0012] The temperature control driving component is installed in the water flow channel. The temperature control driving component is configured to drive the regulating valve core to move from the initial position to the blocking position to block the third flow channel when the water temperature in the water flow channel rises to the preset temperature.

[0013] Optionally, a sealing ring convex is protruded on the inner wall surface of the third flow channel. The temperature control switch is disposed on one side of the sealing ring convex. In the initial position, the regulating valve core is spaced apart from the sealing ring convex to open the third flow channel. In the blocking position, the regulating valve core blocks the sealing ring convex to block the third flow channel.

[0014] Optionally, in the blocking position, the end surface of the regulating valve core facing the sealing ring convex abuts against the end surface of the sealing ring convex facing the regulating valve core, so that the regulating valve core blocks the sealing ring convex; or,

[0015] In the blocking position, one end of the regulating valve core is slidably and sealingly inserted into the inside of the sealing ring convex.

[0016] Optionally, the temperature control driving component includes a driving rod. The regulating valve core is installed on the driving rod. The driving rod is configured to extend when the water temperature in the water flow channel rises to the preset temperature, so as to drive the regulating valve core to move from the initial position to the blocking position.

[0017] Optionally, the temperature control driving component further includes a temperature sensing shell and a temperature sensing medium that expands when heated. The temperature sensing shell is disposed in the water flow channel. The driving rod is slidably installed in the temperature sensing shell. The temperature sensing medium is disposed in the temperature sensing shell. The temperature sensing medium is configured to expand when heated to cause the driving rod to extend and to contract when cooled.

[0018] Optionally, the temperature control driving component further includes a first elastic member. The first elastic member is configured to make the regulating valve core have a tendency to reset to the initial position.

[0019] Optionally, the return water valve further includes a second elastic member. The temperature sensing shell is movably disposed in the water flow channel. The second elastic member is configured to make the temperature sensing shell have a tendency to move in a direction close to the first one-way valve.

[0020] Optionally, the first flow channel includes a first flow section. One end of the first flow section is provided with a first flow port. The other end of the first flow section communicates with the third flow channel, and the extending direction of the first flow section is the same as that of the third flow channel. The temperature control switch is arranged in the first flow section and the third flow channel.

[0021] Optionally, the return water valve further includes an outer joint. The outer joint is detachably installed at the first flow port. The second elastic member is a second return spring. The second return spring is sleeved outside the temperature sensing shell, and one end of the second return spring abuts against the outer joint and the other end is connected to the temperature sensing shell, so that the temperature sensing shell has a tendency to move towards the one-way valve.

[0022] Optionally, the first one-way valve is arranged on the side of the sealing ring convex away from the temperature control switch.

[0023] Optionally, the opening threshold of the first one-way valve is less than that of the second one-way valve.

[0024] Optionally, the second one-way valve includes a second valve core, a second elastic return member and a plug. The second valve core is movably arranged in the fourth flow channel to open or block the fourth flow channel.

[0025] An installation port corresponding to the flow port of the fourth flow channel is arranged on the valve body. The plug is detachably installed in the installation port. The second elastic return member is arranged between the second valve core and the plug, so that the second valve core has a tendency to reset to a position blocking the fourth flow channel.

[0026] Optionally, an adjustment groove is arranged at the flow port of the fourth flow channel. The second valve core is movably arranged in the adjustment groove. The second valve core abuts against the bottom of the adjustment groove to block the fourth flow channel.

[0027] Optionally, the position of the plug in the movable direction of the second valve core is adjustable.

[0028] The present invention also provides a water supply system, including:

[0029] A gas heating device;

[0030] A water outlet end, the water outlet end is connected to the gas water heater through a cold water pipe, a hot water pipe and a water mixing device; and

[0031] The return water valve as described above, 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.

[0032] Optionally, the gas heating device is a gas water heater or a gas wall-mounted boiler.

[0033] The present invention also provides a water supply system, comprising:

[0034] A gas heating device;

[0035] 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;

[0036] The return water valve as described above, 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

[0037] 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.

[0038] For the return water valve of the present invention, by providing a third flow channel and a fourth flow channel which are spaced apart in the valve body to communicate with the first flow channel and the second flow channel respectively, and adding a temperature control switch in the valve body, the on-off of the third flow channel and the fourth flow channel can be automatically controlled by using the temperature change and water pressure change of the water flow in the water flow channel, so that the water supply system can not only realize the zero cold water supply function, but also prevent the situation of pressure boosting and water mixing (that is, prevent the hot water in the hot water pipe or the return water pipe of the water supply system from easily flowing into the cold water pipe through the return water valve) when the water supply system starts to boost and send hot water, so as to ensure the boosting effect. Description of the Drawings

[0039] In order 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.

[0040] Figure 1 It is a schematic structural diagram of an embodiment of the water supply system of the present invention;

[0041] Figure 2 It is a schematic structural diagram of another embodiment of the water supply system of the present invention;

[0042] Figure 3 It is a schematic structural diagram of an embodiment of the return water valve of the present invention;

[0043] Figure 4 For Figure 3 It is a schematic structural diagram of the return water valve in the cold state circulation state in;

[0044] Figure 5 For Figure 3 It is a schematic structural diagram of the return water valve in the hot state circulation state in;

[0045] Figure 6 is Figure 3 a schematic structural diagram when the return water valve in

[0046] is in a hot state and under increased pressure.

[0047]

[0048]

[0049] The realization of the object of the present invention, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Specific Embodiments

[0050] 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. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of the present invention.

[0051] 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 should not be construed as indicating or implying their relative importance or implicitly indicating the quantity of the indicated technical features. Thus, features defined with "first", "second" may explicitly or implicitly include at least one of such features.

[0052] 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 where A and B are satisfied simultaneously.

[0053] The present invention provides a return water valve and a water supply system.

[0054] 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 the zero-cold water function to achieve the timed cruise and heat preservation functions. The return water valve 100 will be introduced in detail below in conjunction 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.

[0055] In the embodiments of the present invention, as Figure 1 and 2As 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 700, a return water valve 100, etc. The water outlet 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, so as to enable the water supply system 1000 to have the zero cold water function.

[0056] 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.

[0057] Among them, one end of the cold water pipe 300 and the cold water inlet 201 are both connected (i.e., communicated) to a water supply pipe (such as a tap water pipe, etc.). 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. The mixed water outlet is communicated with the water outlet 700. Thus, by adjusting the mixing device 600, the water outlet 700 can send out cold water alone or send out mixed hot water with a suitable temperature.

[0058] Optionally, a cold water joint is provided at the cold water inlet 201; and / or, a hot water joint is provided at the hot water outlet 202.

[0059] 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.

[0060] Optionally, the water outlet 700 can be a shower head or a faucet, etc.

[0061] Optionally, multiple water outlets 700 can be provided.

[0062] Optionally, the mixing device 600 is a mixing valve or other mixing devices 600 with a similar function to the mixing valve.

[0063] Optionally, the gas heating device 200 is a gas water heater or a gas wall-mounted boiler, etc. Hereinafter, a gas water heater will be taken as an example for description.

[0064] In an embodiment of the present invention, as Figures 3 - 6 shown, the return water valve 100 includes a valve body 10, a temperature control switch 30, a first one-way valve 20, and a second one-way valve 40.

[0065] Among them, as Figures 3 - 6As shown, the valve body 10 has a water flow channel, which includes a first flow channel 11 and a second flow channel 12 arranged at intervals, and a third flow channel 13 and a fourth flow channel 14 respectively communicating the first flow channel 11 and the second flow channel 12, and the third flow channel 13 and the fourth flow channel 14 are arranged at intervals.

[0066] Among them, as Figures 3 - 6 shown, the temperature control switch 30 is arranged in the water flow channel, and at least part of the temperature control switch 30 is arranged in the third flow channel 13 to block the third flow channel 13 when the water temperature in the water flow channel rises to a preset temperature. Specifically, the temperature control switch 30 is a normally open switch, and is triggered to block the third flow channel 13 when the water temperature near the temperature sensing reaction part of the temperature control switch 30 (i.e., the temperature sensing medium 323 or the temperature sensing elastic sheet, etc. in the following text) rises to the preset temperature. Correspondingly, when the water temperature near the temperature sensing reaction part of the temperature control switch 30 drops below the preset temperature, the temperature control switch 30 will return to the normally open state; that is to say, the temperature control switch 30 can control the on-off of the third flow channel 13 according to the change of the water temperature in the water flow channel. Among them, the preset temperature is determined by the triggering characteristics of the temperature control switch 30.

[0067] Among them, as Figures 3 - 6 shown, at least part of the first one-way valve 20 is arranged in the third flow channel 13 to unidirectionally introduce the water in the first flow channel 11 into the second flow channel 12. Specifically, the first one-way valve 20 is a normally closed switch. After the first one-way valve 20 is opened, the water in the first flow channel 11 can flow through the third flow channel 13 to the second flow channel 12. When the first one-way valve 20 is closed, the first one-way valve 20 is used to prevent the water in the second flow channel 12 from flowing through the third flow channel 13 to the first flow channel 11, that is, to block the third flow channel 13.

[0068] Among them, as Figures 3 - 6 shown, at least part of the second one-way valve 40 is arranged in the fourth flow channel 14 to unidirectionally introduce the water in the first flow channel 11 into the second flow channel 12. Specifically, the second one-way valve 40 is a normally closed switch. After the second one-way valve 40 is opened, the water in the first flow channel 11 can flow through the fourth flow channel 14 to the second flow channel 12. When the second one-way valve 40 is closed, the second one-way valve 40 is used to prevent the water in the second flow channel 12 from flowing through the fourth flow channel 14 to the first flow channel 11, that is, to block the fourth flow channel 14.

[0069] 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.

[0070] 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 1As shown, the first flow channel 11 is connected to the heat exchange tube, and the second flow channel 12 is connected to the cold water pipe 300. When there are multiple water outlet ends 700, the return water valve 100 is optionally provided at the most distal water outlet end 700.

[0071] Specifically, one end of the first flow channel 11 (such as Figure 1 the B end in Figure 1 ) is communicated with 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 Figure 1 ) is communicated with the hot water outlet 202 through the hot water pipe 400; one end of the second flow channel 12 (such as the C end in

[0072] Figure 1 ) is communicated with the cold water inlet through the cold water pipe 300, and the other end of the second flow channel 12 (such as the D end in

[0073] Figure 3 and 4 ) is communicated with 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 14, 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 provided in this return water water path. Figure 4 As shown, the gas heating device 200 further includes a circulating water pump 800. The circulating water pump 800 is provided in the return water water path, and the circulating water pump 800 is used to drive water to flow in the return water water path. 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 cold water and / or boost water supply, etc.

[0073] Specifically, referring to Figure 3 and 4 together, when the water supply system 1000 uses the zero cold water function for circulating preheating, the circulating water pump 800 will push the water in the return water water path 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. At this time, since the water in the hot water pipe 400 is cold water (lower than the preset temperature), the water entering the water flow channel in the valve body 10 is cold water, and the temperature control switch 30 is in the state of opening the third flow channel 13. In this way, the first one-way valve 20 can be opened under the action of the pressure difference, 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 water path to realize the 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 circulation state.

[0074] Meanwhile, it can be understood that if the opening threshold of the first one-way valve 20 (i.e., the critical pressure value / differential pressure value that causes the first one-way valve 20 to switch from the closed state to the open state) is greater than or equal to the opening threshold of the second one-way valve 40 (i.e., the critical pressure value / differential pressure value that causes the second one-way valve 40 to switch from the closed state to the open state), then while the first one-way valve 20 is open, the second one-way valve 40 is also opened, and the water in the first flow channel 11 can also flow from the fourth flow channel 14 into the second flow channel 12, so that the water circulates in the return water circuit.

[0075] If the opening threshold of the first one-way valve 20 is less than the opening threshold of the second one-way valve 40, then while the first one-way valve 20 is open, the second one-way valve 40 will still be in the closed state, and the water in the first flow channel 11 can only flow to the second flow channel 12 through the third flow channel 13.

[0076] Please refer to Figure 5 as well. When the water temperature in the hot water pipe 400 rises to a certain temperature but does not reach the expected preheating temperature, the water temperature at the temperature-sensing reaction part of the temperature control switch 30 in the water flow channel rises to the preset temperature, and the temperature control switch 30 is triggered to block the third flow channel 13 (after that, the first one-way valve 20 slowly closes); at this time, if the second one-way valve 40 is in the open state, the water in the first flow channel 11 can continue to flow from the fourth flow channel 14 to the second flow channel 12, so that the water continues to circulate in the return water circuit to continue the cycle preheating until the expected preheating temperature is reached. At this time, if the second one-way valve 40 is in the closed state (i.e., the opening threshold of the first one-way valve 20 is less than the opening threshold of the second one-way valve 40), the circulation pump 800 will further increase the water pressure in the first flow channel 11 to further increase the pressure difference to open the second one-way valve 40, so that the water in the first flow channel 11 can flow from the fourth flow channel 14 to the second flow channel 12, so that the water continues to circulate to continue the cycle preheating until the expected preheating temperature is reached. At this time, as Figure 5 shown, the return water valve 100 is in the hot state circulation state.

[0077] It can be understood that after the cycle preheating is completed, the circulation pump 800 is turned off, so that the water pressure in the hot water pipe 400 gradually balances with the water pressure in the cold water pipe 300, and the second one-way valve 40 closes.

[0078] Continue to refer to Figure 6 as well. When hot water is turned on and pressurized at the water outlet end 700 (i.e., when hot water is supplied under pressure), there are two situations at this time. One is that the hot water pipe 400 contains hot water, and the other is that the hot water pipe 400 contains cold water.

[0079] For the case where the water in the hot water pipe 400 is hot water, the hot water in the hot water pipe 400 flows into the water flow channel through the first flow channel 11. Since a circulating water pump 800 is used to increase the pressure to increase the hot water output and the water outlet speed, the water pressure in the hot water pipe 400 and the first flow channel 11 increases, and the pressure difference between the first flow channel 11 and the second flow channel 12 will also increase accordingly. Since the water in the hot water pipe 400 is hot water, the water in the water flow channel should also be hot water. Then the temperature control switch 30 is in the closed state to block the third flow channel 13, thereby avoiding the first one-way valve 20 from being accidentally opened.

[0080] Also, since the water in the hot water pipe 400 is hot water, the water outlet end 700 can be directly opened, that is, the water outlet end 700 is also in the open state. After the pressure is increased and water is supplied, the flow rate is relatively large. Due to the characteristic curve of the water pump, when the flow rate is large, the pressure difference between the inlet and outlet of the circulating water pump 800 will decrease. Therefore, the pressure difference between the first flow channel 11 and the second flow channel 12 cannot reach the opening threshold of the second one-way valve 40, that is, it is not sufficient to open the second one-way valve 40, thereby preventing the second one-way valve 40 from being accidentally opened. It should be noted that when the hot water supply with increased pressure starts, the second one-way valve 40 may be briefly opened, but then the second one-way valve 40 will close again due to the decrease in the pressure difference between the inlet and outlet of the circulating water pump 800. As Figure 6 shown, the return water valve 100 is in the hot state with increased pressure.

[0081] In this way, for the case where the water in the hot water pipe 400 is hot water, when the water outlet end 700 opens hot water and the pressure is increased (that is, when hot water is supplied with increased pressure), the first one-way valve 20 and the second one-way valve 40 can be prevented from being accidentally opened, thereby preventing the hot water in the first flow channel 11 from flowing into the second flow channel 12 by mistake, so as to avoid accidentally starting the gas heating device 200 for preheating circulation, etc.

[0082] For the case where the water in the hot water pipe 400 is cold water, before the water outlet end 700 is opened, first, circulation preheating is required. After the preheating is completed, the temperature control switch 30 is triggered to block the third flow channel 13, and the first one-way valve 20 is in the closed state. At this time, the water outlet end 700 is in the state of opening hot water. After the circulating water pump 800 increases the pressure, the flow rate is relatively large. Due to the characteristic curve of the water pump, when the flow rate is large, the pressure difference between the inlet and outlet of the circulating water pump 800 will decrease. Therefore, the pressure difference between the first flow channel 11 and the second flow channel 12 cannot reach the opening threshold of the second one-way valve 40, that is, it is not sufficient to open the second one-way valve 40, thereby preventing the second one-way valve 40 from being accidentally opened. As Figure 6 shown, the return water valve 100 is in the hot state with increased pressure.

[0083] In summary, when the water outlet end 700 opens hot water and the pressure is increased (that is, when hot water is supplied with increased pressure), the return water valve 100 can achieve the effect of preventing water from flowing back.

[0084] Of course, the above-mentioned return water valve 100 can also be used in the water supply system 1000 with a return water pipe 500.

[0085] Specifically, in another embodiment of the water supply system 1000 of the present invention, 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 Figure 2 ), and the other end of the first flow channel 11 (such as

[0086] the B end in

[0087] Figure 2 Figure 2 Figure 2

[0088]

[0089]

[0090] Optionally, the return water valve 100 is arranged close to the gas heating device 200.

[0089] 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.

[0090] 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 14, the second flow channel 12, the water inlet pipe 210, and the heat exchanger of the gas heating device 200, etc.; and the return water valve 100 is arranged in this return water water path.

[0091] In this embodiment, as Figure 2 shown, the gas heating device 200 also includes a circulating water pump 800. The installation position of the circulating water pump 800 can refer to the previous embodiment, and will not be elaborated here one by one.

[0092] In this embodiment, the water supply system 1000 can also achieve circulating preheating and prevent water mixing when boosting and sending hot water. The specific situation can refer to the previous embodiment of the water supply system 1000, and will not be elaborated here.

[0093] Of course, the above water supply system 1000 can also have other water supply modes, which will not be elaborated here one by one.

[0094] As can be seen from the above embodiments, for the return water valve 100 of the present invention, by providing a third flow channel 13 and a fourth flow channel 14 which are spaced apart in the valve body 10 to communicate with the first flow channel 11 and the second flow channel 12 respectively, and adding a temperature control switch 30 in the valve body 10, the on-off of the third flow channel 13 and the fourth flow channel 14 can be automatically controlled by using the temperature change and water pressure change of the water flow in the water flow channel, so that the water supply system 1000 can not only achieve the zero cold water supply function, but also prevent the occurrence of pressurization water cross-flow when the water supply system 1000 starts to pressurize and send hot water (that is, prevent the hot water in the hot water pipe 400 or the return water pipe 500 of the water supply system 1000 from easily flowing into the cold water pipe 300 through the return water valve 100), so as to ensure the pressurization effect.

[0095] Further, the opening threshold of the first one-way valve 20 is smaller than the opening threshold of the second one-way valve 40. In this way, the pressure difference for opening the second one-way valve 40 during pressurized hot water supply can be increased, thereby further preventing water cross-flow.

[0096] It should be noted that, in order to further illustrate the advantages of the return water valve 100 of the present invention, the present invention also provides two basic designs of the return water valve 100. In the basic design 1 of the return water valve 100, only the third flow channel 13 is provided to communicate with the first flow channel 11 and the second flow channel 12, and a temperature control switch 30 and a first one-way valve 20 are provided in the valve body 10 to control the passage of the third flow channel 13; however, in this basic design 1, during cyclic preheating, when the water temperature in the hot water pipe 400 reaches a certain temperature but does not reach the expected preheating temperature, the temperature control switch 30 is triggered to block the third flow channel 13, so that continuous preheating circulation cannot be achieved, nor can the functions of timed cruising and heat preservation be realized.

[0097] In the basic design 2 of the return water valve 100, only the third flow channel 13 is provided to communicate with the first flow channel 11 and the second flow channel 12, and a one-way valve with a relatively large opening threshold is provided in the valve body 10 to prevent water cross-flow. However, during cyclic preheating, this will result in a relatively small flow rate in the cyclic water channel, slow preheating speed, and long preheating time.

[0098] The return water valve 100 in the present invention can overcome the above two disadvantages and integrate the advantages of the above two basic designs to better improve the performance of the water supply system 1000.

[0099] Further, as Figures 3 - 6 shown, the temperature control switch 30 includes a regulating valve core 31 and a temperature control driving assembly 32. The regulating valve core 31 is movably arranged in the third flow channel 13. The regulating valve core 31 has an initial position for opening the third flow channel 13 and a blocking position for blocking the third flow channel 13.

[0100] The temperature control driving component 32 is installed in the water flow channel, and the temperature control driving component 32 is used to drive the regulating valve core 31 to move from the initial position to the blocking position when the water temperature in the water flow channel rises to a preset temperature, so as to block the third flow channel 13. Specifically, during cyclic preheating, as the water in the cyclic water channel circulates, the water temperature near the temperature sensing reaction part of the temperature control switch 30 will gradually rise. When it rises to the preset temperature, the temperature sensing reaction part is triggered, and the temperature control driving component 32 drives the regulating valve core 31 to move from the initial position to the blocking position, so as to block the third flow channel 13.

[0101] In this way, the movement of the regulating valve core 31 can be controlled by the change of the water temperature in the water flow channel, so as to control the on-off of the third flow channel 13.

[0102] In a specific embodiment, the position of the temperature control switch 30 in the valve body 10 is various. For example, the temperature control switch 30 can be arranged on the side of the first check valve 20 close to the second flow channel 12; it can also be arranged on the side of the first check valve 20 close to the first flow channel 11; it can also make the water flow channel of the valve body 10 include a bypass water flow channel communicating with the third flow channel 13, and arrange the temperature control switch 30 in this bypass water flow channel; and so on. The following takes the temperature control switch 30 being arranged on the side of the first check valve 20 close to the first flow channel 11 as an example for illustration.

[0103] Further, as Figures 3 - 6 shown, the temperature control switch 30 is arranged on the side of the first check valve 20 close to the first flow channel 11, and the temperature control driving component 32 is arranged in the first flow channel 11 and / or the third flow channel 13. The temperature control driving component 32 is used to drive the regulating valve core 31 to move from the initial position to the blocking position when the water temperature in the first flow channel 11 and / or the third flow channel 13 increases to the preset temperature.

[0104] Optionally, it can be set that: part of the temperature control driving component 32 is arranged in the first flow channel 11, and the other part is arranged in the third flow channel 13; that is to say, the temperature control switch 30 is arranged in the first flow channel 11 and the third flow channel 13.

[0105] In a specific embodiment, there are many ways for the regulating valve core 31 to open or block the third flow channel 13. For example, the regulating valve core 31 can realize opening or blocking the third flow channel 13 by cooperating with the valve port structure formed in the third flow channel 13, or can realize opening or blocking the third flow channel 13 by cooperating with the valve port structure of the temperature control switch 30 itself, or can even realize opening or blocking the third flow channel 13 by cooperating with the first check valve 20; and so on. The following gives examples for illustration.

[0106] In an embodiment of the return water valve 100 of the present invention, as Figures 3 - 6As shown, a sealing ring convex 131 is protruded from the inner wall surface of the third flow channel 13, and the temperature control switch 30 is arranged on one side of the sealing ring convex 131 (such as the side facing the first flow channel 11). In the initial position, the regulating valve core 31 is arranged at an interval from the sealing ring convex 131 to open the third flow channel 13; in the blocking position, the regulating valve core 31 blocks the sealing ring convex 131 to block the third flow channel 13.

[0107] Specifically, a valve port is formed inside the sealing ring convex 131. When the regulating valve core 31 blocks the sealing ring convex 131, the valve port can be closed to block the third flow channel 13; when the regulating valve core 31 is away from the sealing ring convex 131 (i.e., arranged at an interval from the sealing ring convex 131), the valve port can be opened to open the third flow channel 13.

[0108] In this way, the opening or blocking of the third flow channel 13 can be realized through the cooperation between the regulating valve core 31 and the sealing ring convex 131.

[0109] Specifically, as Figures 3 - 6 shown, the first one-way valve 20 is arranged on the other side of the sealing ring convex 131, that is, the first one-way valve 20 is arranged on the side of the sealing ring convex 131 away from the temperature control switch 30. In this way, the installation of the first one-way valve 20 is prevented from being interfered by the sealing ring convex 131.

[0110] In a specific embodiment, there are many structural forms for realizing the blocking of the sealing ring convex 131 by the regulating valve core 31. For example, the end face of the regulating valve core 31 facing the sealing ring convex 131 can be abutted against the end face of the sealing ring convex 131 facing the regulating valve core 31 to block the regulating valve core 31 against the sealing ring convex 131. Or alternatively, when in the blocking position, one end of the regulating valve core 31 can be slidably and sealingly inserted into the inside of the sealing ring convex 131; and so on.

[0111] Of course, in other embodiments, the sealing ring convex 131 can also be set as a component of the temperature control switch 30. For example, the temperature control switch 30 further includes a sealing sleeve, the sealing sleeve is installed in the third flow channel 13, the inner peripheral wall of the third flow channel 13 is sealingly connected with the sealing sleeve, and the sealing ring convex 131 is formed on the inner wall surface of the sealing sleeve.

[0112] In a specific embodiment, there are many structural forms of the temperature control driving component 32, such as a temperature package component having a temperature package formed by a temperature sensing medium 323 such as paraffin, or a temperature control driving component 32 having a temperature sensing elastic sheet, and so on. It can be understood that the temperature sensing medium 323 such as paraffin or the temperature sensing elastic sheet is a temperature sensing reaction part. The following will be specifically introduced in combination with other structures of the temperature control switch 30.

[0113] In an embodiment of the return water valve 100 of the present invention, as Figures 3 - 6As shown, the temperature control driving assembly 32 includes a driving rod 321, and the regulating valve core 31 is installed on the driving rod 321. The driving rod 321 is configured to extend when the water temperature in the water flow channel rises to a preset temperature, so as to drive the regulating valve core 31 to move from the initial position to the blocking position. Specifically, the driving rod 321 is configured to extend when the water temperature at the temperature sensing reaction part rises to the preset temperature.

[0114] Further, as Figures 3 - 6 shown, the temperature control driving assembly 32 further includes a temperature sensing shell 322 and a temperature sensing medium 323 that expands when heated. The temperature sensing shell 322 is disposed in the water flow channel. The driving rod 321 is slidably installed in the temperature sensing shell 322. The temperature sensing medium 323 is disposed in the temperature sensing shell 322. The temperature sensing medium 323 is configured to expand when heated to cause the driving rod 321 to extend, and to contract when cooled.

[0115] Specifically, the temperature sensing medium 323 expands when the water temperature at the temperature sensing reaction part rises to the preset temperature, so as to drive the driving rod 321 to slide and cause the driving rod 321 to extend. When the water temperature at the temperature sensing reaction part drops below the preset temperature, the temperature sensing medium 323 contracts, so that the driving rod 321 can be reset along with the temperature sensing medium 323 or under the drive of other resetting members.

[0116] Among them, the temperature control driving assembly 32 is a temperature bulb assembly, that is, the temperature sensing shell 322 and the temperature sensing medium 323 in the temperature sensing shell 322 form a temperature bulb, and form a temperature bulb assembly with the driving rod 321.

[0117] Optionally, as Figures 3 - 6 shown, the temperature sensing shell 322 includes a first shell and a second shell, and the first shell and the second shell are assembled to form the temperature sensing shell 322.

[0118] Optionally, the temperature sensing medium 323 is paraffin, or methanol, or toluene, etc. It should be noted that the magnitude 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 set to 37 degrees, etc.

[0119] Further, as Figures 3 - 6 shown, the temperature control driving assembly 32 further includes a first elastic member 324. The first elastic member 324 is configured 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 contracts, the first elastic member 324 will drive the regulating valve core 31 and the driving rod 321 to reset to the initial position together, thereby improving the reliability and other performances of the return water valve 100.

[0120] In a specific embodiment, the first elastic member 324 can be selected as a spring, a spring piece, or a rubber band, etc.

[0121] In this embodiment, the first elastic member 324 is a first return spring. In this way, the structure can be simplified, and the performance of the spring is relatively stable, thereby improving the reliability.

[0122] Specifically, as Figures 3 - 6 shown, one end of the first return spring abuts against the seal ring convex 131, and the other end is connected to the regulating valve core 31, so that the regulating valve core 31 has a tendency to return to the initial position.

[0123] In this way, when the regulating valve core 31 moves towards the blocking position, the regulating valve core 31 compresses the first return spring, so that the regulating valve core 31 has a tendency to return to the initial position; when the temperature-sensitive medium 323 contracts, the first return spring extends to drive the regulating valve core 31 to return to the initial position.

[0124] Optionally, as Figures 3 - 6 shown, the first return spring is sleeved outside the regulating valve core 31, which can not only improve the stability of the movement of the regulating valve core 31, but also reduce the space occupied in the moving direction of the regulating valve core 31. Specifically, an installation side convex 311 is provided on the outer peripheral surface of the regulating valve core 31, and the other end of the first return spring is connected to (such as abuts against) the installation side convex 311. Among them, the installation side convex 311 is optionally provided at the other end of the regulating valve core 31 (that is, the end far from the first one-way valve 20); among them, the installation side convex 311 can be set as an annular structure or a plurality of them are distributed at intervals along the circumference of the regulating valve core 31.

[0125] Specifically, as Figures 3 - 6 shown, an installation hole is provided on the regulating valve core 31, and the driving rod 321 is installed in the installation hole.

[0126] In this embodiment, the regulating valve core 31 is generally in a cap shape.

[0127] Of course, in other embodiments, the temperature-sensitive driving assembly can also be set in other structural forms. For example, the temperature-sensitive driving assembly can further include a temperature-sensitive seat, a temperature-sensitive elastic sheet and an elastic reset member provided on the temperature-sensitive seat, so that the driving rod 321 extends when the temperature-sensitive elastic sheet deforms due to temperature rise, and the driving rod 321 retracts through the elastic reset member; or, the driving rod 321 and the elastic reset member can be omitted, and the temperature-sensitive elastic sheet directly drives the regulating valve core 31 to move; and so on.

[0128] Furthermore, as Figures 3 - 6As shown, the return water valve 100 further includes a second elastic member. The temperature control driving assembly 32 is movably disposed in the water flow channel, and the second elastic member is used to make the temperature control driving assembly 32 tend to move in a direction close to the first one-way valve 20. Specifically, the temperature sensing shell 322 is movably disposed in the water flow channel, and the second elastic member is used to make the temperature sensing shell 322 tend to move in a direction close to the first one-way valve 20.

[0129] Wherein, the sliding direction of the regulating valve core 31 and the moving direction of the temperature sensing shell 322 should both be in the direction of approaching or departing from the first one-way valve 20.

[0130] 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 regulating valve core 31 to move to the blocking position, it will still continue to drive the regulating valve core 31 to move in a direction away from the initial position, which may damage the regulating valve core 31 and the like.

[0131] However, in the present invention, by movably disposing the temperature sensing shell 322 in the water flow channel and arranging a second elastic member to make the temperature sensing shell 322 tend to move in a direction close to the first one-way valve 20, when the regulating valve core 31 moves to the blocking position, due to the temperature sensing delay characteristic of the temperature sensing medium 323 such as paraffin, the temperature sensing medium 323 such as paraffin will still continue to expand and make the driving rod 321 continue to extend. At this time, the temperature sensing shell 322 can be driven to move in a direction away from the first one-way valve 20 and compress the second elastic member, so as to avoid the regulating valve core 31 and the like, and achieve the protection of the temperature control switch 30.

[0132] Optionally, as Figures 3 - 6 shown, the second elastic member is a second return spring 34. Specifically, one end of the second return spring 34 is connected to the inner wall surface of the water flow channel, and the other end is connected to the temperature sensing shell 322, so that the temperature sensing shell 322 has a tendency to move in a direction close to the first one-way valve 20.

[0133] Optionally, as Figures 3 - 6 shown, the second return spring 34 is sleeved outside the temperature sensing shell 322, so as to not only improve the moving stability of the temperature sensing shell 322, but also reduce the space occupied in the moving direction of the regulating valve core 31.

[0134] Optionally, as Figures 3 - 6 shown, the outer peripheral surface of the temperature sensing shell 322 is provided with an installation ring convex 3221, and the other end of the second return spring 34 is connected to (such as abutted against) the installation ring convex 3221.

[0135] Optionally, the elastic coefficient of the first return spring is less than the elastic coefficient of the second return spring 34.

[0136] Further, as Figures 3 - 6 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 port 113. The other end of the first flow section 111 communicates with the third flow channel 13, and the extending direction of the first flow section 111 is the same as that of the third flow channel 13. The temperature control switch 30 is disposed in the first flow section 111 and the third flow channel 13.

[0137] In this way, the temperature control switch 30 can be installed into the first flow channel 11 and the third flow channel 13 through the first flow port 113, so as to simplify the installation process. Moreover, part of the structure of the temperature control switch 30 can be arranged in the first flow section 111, so as to improve the space utilization rate in the valve body 10, so as to facilitate the miniaturized design of the return water valve 100.

[0138] Further, as Figures 3 - 6 shown, the return water valve 100 further includes an external joint 70. The external joint 70 is detachably installed at the first flow port 113. The second return spring 34 is sleeved outside the temperature sensing shell 322. One end of the second return spring 34 abuts against the external joint 70, and the other end is connected to the temperature sensing shell 322, so that the temperature sensing shell 322 has a tendency to move towards the direction close to the one-way valve. Moreover, the temperature control driving assembly 32 can be movably installed in the water flow channel through the action of the first return spring and the second return spring 34.

[0139] Optionally, the external joint 70 is a threaded joint / threaded interface.

[0140] Further, as Figures 3 - 6 shown, in order to improve the installation and movement stability of the temperature control driving assembly 32, the temperature control switch 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.

[0141] Specifically, the support frame 35 is provided with a support hole, and the temperature sensing shell 322 is slidably installed in the support hole, so that the temperature control driving assembly 32 can be movably installed in the water flow channel.

[0142] Further, as Figures 3 - 6 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 port 123. The other end of the second flow section 121 communicates with the third flow channel 13, and the extending direction of the second flow section 121 is the same as that of the third flow channel 13. In this way, the one-way valve can be installed into the third flow channel 13 and / or the second flow section 121 through the second flow port 123.

[0143] Optionally, as Figures 3 - 6 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.

[0144] Optionally, as Figures 3 - 6 shown, the return water valve 100 further includes a water volume adjusting core 60, which is arranged in the second flow section 121 and abuts against the first one-way valve 20; thus, on the one hand, the first one-way valve 20 can be fixed in the valve body 10, and on the other hand, the water flow rate of the second flow channel 12 can also be adjusted.

[0145] Furthermore, as Figures 3 - 6 shown, the first one-way valve 20 includes a first valve core 21, a first elastic reset member 23, and a first valve housing 22 with both ends open.

[0146] Among them, the first valve housing 22 is sealingly installed in the third flow channel 13 and / or the second flow section 121, and the first valve housing 22 is limited at the sealing ring convex 131.

[0147] Among them, the first valve core 21 is movably arranged in the first valve housing 22 to open or close the first one-way valve 20. Specifically, a valve port convex is provided on the inner wall surface of the first valve housing 22, and the first valve core 21 realizes the opening or closing of the first one-way valve 20 through cooperation with the valve port convex.

[0148] Furthermore, as Figures 3 - 6 shown, the first flow channel 11 further includes a third flow section 112 communicating with the first flow section 111, the connection between the first flow section 111 and the third flow section 112 communicates with the third flow channel 13, and a third flow port 114 is provided at one end of the third flow section 112.

[0149] The second flow channel 12 further includes a fourth flow section 122 communicating with the second flow section 121, the connection between the second flow section 121 and the fourth flow section 122 communicates with the third flow channel 13, and a fourth flow port 124 is provided at one end of the fourth flow section 122.

[0150] Specifically, as Figures 3 - 6 shown, the fourth flow channel 14 communicates the second flow section 121 and the fourth flow section 122.

[0151] Furthermore, as Figures 3 - 6 shown, the second one-way valve 40 includes a second valve core 41, a second elastic reset member 42, and a plug 43. The second valve core 41 is movably arranged in the fourth flow channel 14 to open or block the fourth flow channel 14.

[0152] An installation port 15 is provided at the flow port of the valve body 10 corresponding to the fourth flow channel 14. The plug 43 is detachably installed in the installation port 15. The second elastic reset member 42 is disposed between the second valve core 41 and the plug 43, so that the second valve core 41 has a tendency to reset to a position blocking the fourth flow channel 14.

[0153] In this way, the second valve core 41 directly cooperates with the fourth flow channel 14 to control the on / off of the fourth flow channel 14, which can simplify the structure of the return water valve 100.

[0154] Further, as Figures 3 - 6 shown, an adjustment groove 141 is provided at the flow port of the fourth flow channel 14. The second valve core 41 is movably disposed in the adjustment groove 141. The second valve core 41 abuts against the bottom of the adjustment groove 141 to block the fourth flow channel 14. In this way, the structure of the return water valve 100 can be further simplified.

[0155] Further, as Figures 3 - 6 shown, the position of the plug 43 in the movable direction of the second valve core 41 is adjustable. In this way, the opening threshold of the second one-way valve 40 can be adjusted, so that the opening threshold of the second one-way valve 40 can be adjusted according to requirements.

[0156] Specifically, the opening threshold (i.e., the water pressure opening pressure) of the second one-way valve 40 can be greater than or equal to 0.08 MPa and less than or equal to 0.13 MPa. For example, when the plug 43 moves to the position closest to the fourth flow channel 14, the opening threshold of the second one-way valve 40 can be selected as 0.13 MPa.

[0157] Specifically, the plug 43 is threadedly connected to the installation port 15, so that the position of the plug 43 in the movable direction of the second valve core 41 is adjustable.

[0158] Further, as Figures 3 - 6 shown, the elastic coefficient of the elastic reset member (i.e., the first elastic reset member 23) of the first one-way valve 20 is less than the elastic coefficient of the elastic reset member (i.e., the second elastic reset member 42) of the second one-way valve 40, so as to facilitate the opening threshold of the first one-way valve 20 to be less than the opening threshold of the second one-way valve 40.

[0159] Of course, in other embodiments, the second one-way valve 40 can also be set to other structural forms, such as including a second valve housing, the second valve housing is sealed and installed on the fourth flow channel 14, and the second valve core 41 is movably disposed in the second valve housing; and so on.

[0160] Of course, in specific embodiments, there are also various ways to design the water flow channels in the valve body 10. For example, the first flow channel 11, the second flow channel 12, the third flow channel 13, and the fourth flow channel 14 can all be straight flow channels. The third flow channel 13 and the fourth flow channel 14 are both arranged between the first flow channel 11 and the second flow channel 12 and are respectively connected to the first flow channel 11 and the second flow channel 12; and so on.

[0161] The above are only the 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 any 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, Comprising: A valve body having a water flow channel, the water flow channel including a first flow channel and a second flow channel arranged at intervals, and a third flow channel and a fourth flow channel respectively communicating the first flow channel and the second flow channel, the third flow channel and the fourth flow channel being arranged at intervals; A temperature control switch disposed in the water flow channel, at least part of the temperature control switch being disposed in the third flow channel for blocking the third flow channel when the water temperature in the water flow channel rises to a preset temperature; A first one-way valve, at least part of the first one-way valve being disposed in the third flow channel for unidirectionally introducing water in the first flow channel into the second flow channel; and A second one-way valve, at least part of the second one-way valve being disposed in the fourth flow channel for unidirectionally introducing water in the first flow channel into the second flow channel.

2. The water return valve according to claim 1, wherein The temperature control switch includes a regulating valve core and a temperature control driving assembly, the regulating valve core being movably disposed in the third flow channel, the regulating valve core having an initial position for opening the third flow channel and a blocking position for blocking the third flow channel; The temperature control driving assembly is installed in the water flow channel, and the temperature control driving assembly is configured to drive the regulating valve core to move from the initial position to the blocking position to block the third flow channel when the water temperature in the water flow channel rises to the preset temperature.

3. The water return valve according to claim 2, characterized in that, A sealing ring protrusion is convexly provided on the inner wall surface of the third flow channel, the temperature control switch is disposed on one side of the sealing ring protrusion, and in the initial position, the regulating valve core is spaced apart from the sealing ring protrusion to open the third flow channel; in the blocking position, the regulating valve core is blocked by the sealing ring protrusion to block the third flow channel.

4. The return water valve according to claim 3, characterized in that, In the blocking position, the end surface of the regulating valve core facing the sealing ring protrusion abuts against the end surface of the sealing ring protrusion facing the regulating valve core, so that the regulating valve core is blocked by the sealing ring protrusion; Or, In the blocking position, one end of the regulating valve core is slidably and sealingly inserted into the inside of the sealing ring protrusion.

5. The return water valve according to claim 2, characterized in that, The temperature control driving assembly includes a driving rod, the regulating valve core is installed on the driving rod, and the driving rod is configured to extend when the water temperature in the water flow channel rises to the preset temperature to drive the regulating valve core to move from the initial position to the blocking position.

6. The return water valve according to claim 5, characterized in that, The temperature control driving assembly further includes a temperature sensing shell and a temperature sensing medium that expands upon heating, the temperature sensing shell is disposed in the water flow channel, the driving rod is slidably installed in the temperature sensing shell, the temperature sensing medium is disposed in the temperature sensing shell, and the temperature sensing medium is configured to expand when heated to cause the driving rod to extend and to contract when cooled.

7. The return water valve according to claim 6, characterized in that, The temperature control driving assembly further includes a first elastic member, and the first elastic member is configured to make the regulating valve core have a tendency to reset to the initial position.

8. The return water valve according to claim 7, characterized in that, The return water valve further includes a second elastic member, the temperature sensing shell is movably disposed in the water flow channel, and the second elastic member is configured to make the temperature sensing shell have a tendency to move in a direction close to the first one-way valve.

9. The return water valve according to claim 8, wherein, The first flow channel includes a first flow section. One end of the first flow section is provided with a first flow port, and the other end of the first flow section communicates with the third flow channel, and the extending direction of the first flow section is the same as that of the third flow channel. The temperature control switch is arranged in the first flow section and the third flow channel.

10. The return water valve according to claim 9, characterized in that, The return water valve further includes an external joint, which is detachably installed at the first flow port. The second elastic member is a second return spring, and the second return spring is sleeved outside the temperature sensing shell. One end of the second return spring abuts against the external joint, and the other end is connected to the temperature sensing shell, so that the temperature sensing shell has a tendency to move towards the one-way valve.

11. The water return valve according to claim 3, characterized in that, The first one-way valve is arranged on the side of the sealing ring convex away from the temperature control switch.

12. The return water valve according to any one of claims 1 to 11, characterized in that The opening threshold of the first one-way valve is less than that of the second one-way valve.

13. The return water valve according to any one of claims 1 to 11, characterized in that, The second one-way valve includes a second valve core, a second elastic return member and a plug. The second valve core is movably arranged in the fourth flow channel to open or block the fourth flow channel. An installation port is provided on the valve body corresponding to the flow port of the fourth flow channel. The plug is detachably installed in the installation port. The second elastic return member is arranged between the second valve core and the plug, so that the second valve core has a tendency to reset to a position blocking the fourth flow channel.

14. The return water valve according to claim 13, characterized in that, An adjustment groove is provided at the flow port of the fourth flow channel. The second valve core is movably arranged in the adjustment groove, and the second valve core abuts against the bottom of the adjustment groove to block the fourth flow channel.

15. The return water valve according to claim 13, characterized in that, The position of the plug in the movable direction of the second valve core is adjustable.

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 mixing device; And The return water valve according to any one of claims 1 to 15, 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.

17. The water supply system according to claim 16, characterized in that, The gas heating device is a gas water heater or a gas wall-mounted boiler.

18. 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 mixing device; The return water valve according to any one of claims 1 to 15, 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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