Connecting valve, return water valve, pressure valve assembly and water supply system

Abstract

The present invention discloses a connecting valve, a return water valve, a pressure valve assembly and a water supply system. The return water valve includes a valve body and a linkage valve. The valve body is provided with a hot water flow channel, a cold water flow channel and a one-way flow channel; the hot water flow channel includes a water inlet cavity, a communication cavity and a water outlet cavity, the communication cavity has a water inlet communicating with the water inlet cavity, and a water outlet communicating with the water outlet cavity; the one-way flow channel connects the communication cavity with the cold water flow channel. The linkage valve is arranged in the hot water flow channel and is adapted to switch between an initial position and an open position; wherein: in the initial position, one end of the linkage valve blocks the water outlet, and a gap is formed between the other end of the linkage valve and the water inlet; in the open position, the linkage valve opens both the water inlet and the water outlet. The return water valve of the present invention can solve the problem that the water in the hot water flow channel flows into the cold water flow channel when the water supply system uses the cold water mode.

Description

Technical Field

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

[0002] Water supply systems such as water heater water supply systems or wall - hung boiler water supply systems are generally used to provide water for users. Conventional water supply systems usually include structures such as a gas supply device, a cold water pipe, a hot water pipe, a mixing device, etc.; among them, the gas supply device is connected to the mixing device through the hot water pipe to use the mixing device to mix the hot water supplied by the gas supply device and the cold water supplied by the cold water pipe into water with a suitable temperature and supply it to the water outlet device (such as a shower head, a faucet and other water outlet structures) for users to use.

[0003] In related technologies, in order to endow a traditional water supply system with the zero - cold - water function, a return water valve is usually configured in the water supply system. This return water valve has a hot water flow channel, a cold water flow channel and a one - way flow channel connecting the hot water flow channel and the cold water flow channel, and a one - way valve is arranged in the one - way flow channel. Therefore, when this return water valve is connected to the cold water pipe and the hot water pipe, a return water waterway can be formed in the water supply system. Thus, when the zero - cold - water mode is turned on, the cold water at the water outlet end is first refluxed to the hot water supply device through this return water flow path, and then supplied to the water outlet device after being heated by the hot water supply device, so as to avoid cold water at the initial stage of the water outlet device being turned on.

[0004] However, for the above - mentioned water supply systems with the zero - cold - water function, when the water pressure in the user's pipeline is relatively high, if the cold - water mode of the water supply system is turned on (such as turning on cold water or flushing the toilet, etc.), the cold - water flow rate will be relatively large, and it is easy to form a large water pressure difference on both the cold - water and hot - water sides. The hot water in the hot - water pipe of the water supply system is easy to push open the one - way valve of the return water valve under the action of this water pressure difference, resulting in a large amount of hot water flowing into the cold - water pipe, and further leading to problems with the start - up of the hot - water supply device. 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 when the water supply system is used alone for cold water, the hot water in the hot - 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, the present invention provides a return water valve, which includes a valve body and a linkage valve. The valve body is provided with a hot water flow channel, a cold water flow channel and a one-way flow channel; the hot water flow channel includes a water inlet cavity, a communication cavity and a water outlet cavity, the communication cavity has a water inlet communicating with the water inlet cavity, and a water outlet communicating with the water outlet cavity; the one-way flow channel communicates the communication cavity with the cold water flow channel. The linkage valve is arranged in the hot water flow channel and is adapted to switch between an initial position and an open position; wherein: in the initial position, one end of the linkage valve blocks the water outlet of the communication cavity, and a gap is formed between the other end of the linkage valve and the water inlet of the communication cavity; in the open position, the linkage valve opens both the water inlet and the water outlet of the communication cavity.

[0007] Optionally, the linkage valve includes a valve core seat arranged in the water outlet cavity for blocking the water outlet of the communication cavity, and a valve core arranged in the communication cavity and linked with the valve core seat. In the initial position, the linkage valve forms the gap between the valve core and the water inlet of the communication cavity.

[0008] Optionally, the linkage valve further includes a connecting shaft, the connecting shaft has an upper shaft section connected to the valve core seat, and a lower shaft section connected to the upper shaft section and inserted into the water outlet cavity, and the valve core is sleeved on the lower shaft section.

[0009] Optionally, the length of the valve core sleeved on the lower shaft section is adjustable, so that the size of the gap formed between the valve core and the water inlet of the communication cavity is adjustable.

[0010] Optionally, one end of the valve core is provided with a socket hole sleeved with the connecting shaft, and the other end thereof is provided with an adjusting screw hole communicating with the socket hole; the linkage valve further includes an adjusting screw, the adjusting screw is installed in the adjusting screw hole and is in contact and cooperation with the end face of the connecting shaft.

[0011] Optionally, the valve core seat is sleeved on the upper shaft section of the connecting shaft; the linkage valve further includes a pressure relief member, the pressure relief member is elastic, and the pressure relief member connects the valve core seat and the upper shaft section.

[0012] Optionally, the pressure relief member is configured as a first spring, one end of the first spring is connected to the valve core seat, and the other end of the first spring is connected to the end of the upper shaft section away from the upper shaft section.

[0013] Optionally, a first limiting groove is provided on the side of the valve core seat facing away from the valve core; one end of the first spring connected to the valve core seat is installed in the first limiting groove.

[0014] Optionally, a second limiting groove is provided at one end of the upper shaft section of the connecting shaft away from the valve core; one end of the first spring connected to the upper shaft section is installed in the second limiting groove.

[0015] Optionally, an annular sealing portion is convexly provided on the outer peripheral wall of one end of the valve core away from the valve core seat, and a gap is formed between the annular sealing portion of the valve core and the inlet in the initial position.

[0016] Optionally, the linkage valve further includes a sealing gasket, and the sealing gasket is provided on the lower surface of the valve core seat.

[0017] Optionally, a supporting portion is convexly provided on the outer peripheral wall of the connecting shaft, and the supporting portion divides the connecting shaft into an upper shaft section and a lower shaft section. The opposite two side surfaces of the supporting portion are respectively adapted to support the valve core seat and the valve core.

[0018] Optionally, the return water valve further includes a reset member, and the reset member is used to make the linkage valve have a tendency to reset to the initial position.

[0019] Optionally, the return water valve further includes a check valve, and the check valve is provided in the one-way flow channel to guide the water flow in the hot water flow channel to flow unidirectionally to the cold water flow channel during return water.

[0020] The present invention also provides a water supply system, which includes a hot water supply device, a water mixing device and a return water valve. Among them, the hot water supply device has a water inlet pipe and a water outlet pipe. The hot water access end of the water mixing device is communicated with the water outlet pipe through a hot water pipe, and the cold water access end of the water mixing device is communicated with the water inlet pipe through a cold water pipe. The return water valve includes a valve body and a linkage valve. The valve body is provided with a hot water flow channel, a cold water flow channel and a one-way flow channel; the hot water flow channel includes a water inlet cavity, a communication cavity and a water outlet cavity, and the water inlet and the water outlet of the communication cavity are respectively communicated with the water inlet cavity and the water outlet cavity; the one-way flow channel communicates the communication cavity with the cold water flow channel. The linkage valve is arranged in the hot water flow channel, and the linkage valve is adapted to switch between an initial position and an open position; wherein: in the initial position, one end of the linkage valve blocks the water outlet of the communication cavity, and a gap is formed between the other end of the linkage valve and the water inlet of the communication cavity; in the open position, the linkage valve opens both the water inlet and the water outlet of the communication cavity. The hot water flow channel of the return water valve is connected to the hot water pipe, and the cold water flow channel of the return water valve is connected to the cold water pipe.

[0021] Optionally, the hot water supply device is a gas water heater or a gas wall-mounted boiler or an electric water heater.

[0022] The technical solution of the present invention is to configure a linkage valve in the hot water flow path of the return water valve. The linkage valve is adapted to switch between an initial position and an open position. Wherein, in the initial position, one end of the linkage valve blocks the water outlet of the communication cavity, and there is a gap between the other end of the linkage valve and the water inlet of the communication cavity. When water hammer phenomenon occurs in the cold water mode, a small part of the water flow in the water inlet cavity of the hot water flow path of the return water valve is discharged into the communication cavity of the hot water flow path through this gap, so as to relieve the pressure of the water inlet cavity, limit the water flow in the water inlet cavity from pushing up the linkage valve, keep the linkage valve in the initial position, and thus greatly reduce the amount of water leaking from the hot water pipe into the communication cavity, ensuring that the hot water supply device will not be accidentally started due to the cross-flow of water in the hot water pipe in this mode, and realizing that the hot water supply device does not start when cold water is turned on. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] 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, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0024] Figure 1 It is a schematic structural diagram of an embodiment of the water supply system of the present invention;

[0025] Figure 2 It is a schematic structural diagram of an embodiment of the return water valve of the present invention;

[0026] Figure 3 It is Figure 2 the enlarged view at A in

[0027] Figure 4 It is Figure 2 the schematic diagram of the state of the return water valve in the cold water mode in

[0028] Figure 5 It is Figure 2 the schematic diagram of the state of the return water valve in the hot water mode in

[0029] Figure 6 It is Figure 2 the schematic diagram of the state of the return water valve in the zero cold water mode and when the water inlet cavity and the water outlet cavity of the hot water flow path are at the same pressure in

[0030] Figure 7 It is Figure 2 the schematic structural diagram of the linkage valve in

[0031] Figure 8 It is Figure 7 the exploded schematic structural diagram of the linkage valve in

[0032] Figure 9 is Figure 2 a schematic diagram of the state when the return water valve in [[ID=]] is in the zero cold water mode and the pressure of the water outlet cavity of the hot water flow channel is greater than that of the water inlet cavity;

[0033] Figure 10 is Figure 9 an enlarged view of part B in [[ID=]];

[0034] Figure 11 a schematic structural diagram of another embodiment of the water supply system of the present invention;

[0035] Figure 12 is Figure 1 a schematic diagram of the state of an embodiment of the pressure valve assembly in [[ID=]] in the cold water mode;

[0036] Figure 13 is Figure 17 a schematic diagram of the state of the pressure valve assembly in [[ID=]] in the hot water mode;

[0037] Figure 14 is Figure 17 a schematic diagram of the state of the pressure valve assembly in [[ID=]] in the zero cold water mode and when the pressures of the water inlet cavity and the water outlet cavity of the hot water flow channel are equal;

[0038] Figure 15 is Figure 17 a schematic diagram of the state of the pressure valve assembly in [[ID=]] in the zero cold water mode and when the pressure of the water outlet cavity of the hot water flow channel is greater than that of the water inlet cavity;

[0039] Figure 16 is Figure 15 an enlarged view of part C in [[ID=]];

[0040] Figure 17 is Figure 12 a schematic structural diagram of an embodiment of the communication valve in [[ID=]];

[0041] Figure 18 is Figure 17 an enlarged view of part D in [[ID=]];

[0042] Figure 19 is Figure 17 a schematic structural diagram of the linkage valve in [[ID=]];

[0043] Figure 20 is Figure 19 a schematic exploded view of the linkage valve in [[ID=]];

[0044] Figure 21 a schematic structural diagram of another embodiment of the water supply system of the present invention;

[0045] Figure 22 is Figure 21 a schematic structural diagram of an embodiment of the pressure valve assembly in [[ID=]]. Explanation of the reference numerals in the drawings:

[0046] Table 1: Attached Figures 1 to 10 Label description

[0047] Label Name Label Name 100 Valve body 332 Lower shaft section 110 Hot water flow channel 333 Support part 111 Water inlet cavity 334 Second limit groove 112 Communication cavity 340 Adjusting screw 113 Water outlet cavity 350 Pressure relief part / First spring 120 Cold water flow channel 360 Sealing gasket 130 One-way flow channel 301 Gap 200 One-way valve 302 Open gap 300 Linkage valve 400 Reset part / Second spring 310 Valve core seat 500 Water regulating valve 311 First limit groove 10 Return water valve 320 Valve core 20 Hot water supply device 321 Annular sealing part 30 Water mixing device 322 Socket hole 40 Water outlet device 323 Adjusting screw hole 50 Hot water pipe 330 Connecting shaft 60 Cold water pipe 331 Upper shaft section 70 Circulating water pump

[0048] Table 2: Attached Figures 11 to 20 Label description

[0049]

[0050]

[0051] The realization, functional features and advantages of the object of the present invention will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0052] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described with reference to 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 shall fall within the protection scope of the present invention.

[0053] 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.

[0054] 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 at the same time.

[0055] Figures 1 to 10 For the present invention, a schematic diagram of an embodiment of a return water valve and a water supply system is proposed. The Figures 1 to 10 Label description of the attached drawings can be seen in Table 1 above. The return water valve 10 is used to be connected to the cold water pipe 50 and the hot water pipe 60 of the water supply system to form a return water waterway in the water supply system, so that the water supply system has a zero cold water mode, and can also solve the problem that hot water flows into the cold water pipe through the one-way flow channel of the return water valve when the cold water mode of the water supply system is turned on.

[0056] Please refer to Figure 2 and Figure 3, in an embodiment of the return water valve of the present invention, the return water valve 10 includes a valve body 100 and a linkage valve 300. The valve body 100 is provided with a hot water flow channel 110, a cold water flow channel 120, and a one-way flow channel 130; the hot water flow channel 110 includes a water inlet cavity 111, a communication cavity 112, and a water outlet cavity 113. The communication cavity 112 has a water inlet 112a communicating with the water inlet cavity 111 and a water outlet 112b communicating with the water outlet cavity 113; the one-way flow channel 130 communicates the communication cavity 112 with the cold water flow channel 120. The linkage valve 300 is disposed in the hot water flow channel 110 and is adapted to switch between an initial position and an open position; wherein: in the initial position, one end of the linkage valve 300 blocks the water outlet 112b, and a gap 301 is formed between the other end of the linkage valve 300 and the water inlet 112a; in the open position, the linkage valve 300 opens both the water inlet 112a and the water outlet 112b.

[0057] Specifically, the one-way flow channel 130 of the return water valve 10 is adapted to guide the water flow to flow unidirectionally from the hot water flow channel 110 to the cold water flow channel 120 and cannot flow reversely. To achieve the unidirectional flow of the water flow in the one-way flow channel 130, a one-way valve 200 can be disposed in the one-way flow channel 130. The one-way valve 200 can have various structural types, and various types of one-way valves are relatively common in the current market and will not be listed one by one here. Optionally, the one-way valve 200 includes a one-way valve core 210 movably disposed in the one-way flow channel 130 and a return spring 220 connecting the one-way valve core 210 and the valve body 100. The one-way valve 200 has an open position for opening the one-way flow channel 130 and a closed position for being reset to close the one-way flow channel 130 under the drive of the return spring 220.

[0058] The linkage valve 300 is installed in the hot water flow channel 110 of the return water valve 10 and is adapted to move from the initial position to the open position when the pressure difference between the water pressure in the water inlet cavity 111 and the water pressure in the water outlet cavity 113 of the hot water flow channel 110 increases, which has the following two meanings: 1) When the pressure difference between the water pressure in the water inlet cavity 111 and the water pressure in the water outlet cavity 113 starts to increase, the linkage valve 300 moves from the initial position to the open position; 2) When the pressure difference between the water pressure in the water inlet cavity 111 and the water pressure in the water outlet cavity 113 increases to a preset value, the linkage valve 300 moves from the initial position to the open position. In a specific embodiment, the above two design methods can be selected according to actual needs.

[0059] The hot water flow channel 110 of the return water valve 10 is also provided with a first interface 101 at the inlet of its water inlet cavity 111, and a second interface 102 is provided at the outlet of the water outlet cavity 113; the cold water flow channel 120 of the return water valve 10 is provided with a third interface 103 at its inlet, and a fourth interface 104 is provided at its outlet. When assembling the return water valve 10 into the water supply system, the first interface 101 of the return water valve 10 is connected to the hot water supply device 20 through the hot water pipe 50, and the second interface 102 is connected to the hot water access end 31 of the mixing device 30; the third interface 103 is connected to the cold water source (such as a tap water pipeline) through the cold water pipe 60, and the fourth interface 104 is connected to the cold water access end 32 of the mixing device 30. In addition, the water supply system is also equipped with a circulation water pump 70, and the circulation water pump 70 is used to connect the third interface 103 and the hot water supply device 20 to suck cold water. The circulation water pump 70 can be arranged on the pipeline between the heat exchanger of the hot water supply device 20 and the cold water pipe 60. Specifically, the circulation water pump 70 is arranged on the water inlet pipe 21 of the hot water supply device 20.

[0060] Since the water supply system is equipped with the return water valve 10, the water supply system has at least three working modes: cold water mode, hot water mode and zero cold water mode. The working principles of these three working modes will be explained below. For details, please refer to the following text.

[0061] Please refer to Figure 1 and Figure 4 , when the water supply system uses the cold water mode, the return water valve 10 is in the initial position; at this time, the pressure of the cold water flow channel 120 of the return water valve 10 decreases, and the water flow in the cold water pipe 60 flows from the cold water flow channel 120 to the cold water access end 32 of the mixing device 30, and then is supplied to the water outlet device 40 through the output end of the mixing device 30. At this time, the one-way valve core 210 of the one-way valve 200 is in the closed position under the tension of the return spring 220.

[0062] In the above cold water mode, since the pressure of the cold water pipe 60 decreases, the pressure of the cold water flow channel 120 of the return water valve 10 will decrease. The water inlet cavity 111 of the hot water flow channel 110 of the return water valve 10 is connected to the hot water pipe 50, and the pressure of the hot water pipe 50 is higher than that of the cold water pipe 60. The water flow in the hot water pipe 50 has a tendency to enter the cold water flow channel 120 from the water inlet cavity 111, thus having a tendency to push the linkage valve 300 upward; in addition, the water outlet cavity 113 of the hot water flow channel 110 is connected to the hot water access end 31 of the mixing device 30, and the hot water access end 31 is in a closed state, so the water outlet cavity 113 is in a pressure-holding state. The pressure reduction of the cold water flow channel 120 also causes a pressure difference between the water outlet cavity 113 of the hot water flow channel 110 and the cold water flow channel 120. Therefore, the water pressure of the water outlet cavity 113 also has a tendency to push the linkage valve 300 downward, thus offsetting the upward thrust of the water inlet cavity 111 of the hot water flow channel 110 on the linkage valve 300 and restricting the upward movement of the linkage valve 300 to open, so that the linkage valve 300 remains in the initial position.

[0063] However, due to the sudden loss of pressure of the water pressure in the cold water flow channel 120 of the return water valve 10, the pressure of the water inlet cavity 111 of the hot water flow channel 110 is relatively higher than the pressure of the cold water flow channel 120, which easily leads to the situation that the pressure of the water inlet cavity 111 is slightly greater than the pressure of the water outlet cavity 113, resulting in a water hammer phenomenon. In this case, if the linkage valve 300 is in complete sealed cooperation with the water inlet 112a of the communication cavity 112 with zero clearance, then the upward acting force exerted on the linkage valve 300 by the water flow in the water inlet cavity 111 will be greater than the downward acting force exerted on the linkage valve 300 by the water flow in the water outlet cavity 113. As a result, the water flow in the water inlet cavity 111 will push the linkage valve 300 upward to open, so that the linkage valve 300 will open the water inlet 112a of the communication cavity 112, and a large amount of water flow in the hot water pipe 50 will enter the communication cavity 112, and then rush through the check valve 200 from the communication cavity 112 into the cold water flow channel 120. The increase in the water flow in the hot water pipe 50 is very likely to trigger the start of the hot water supply device 20, resulting in the situation that the hot water supply device 20 starts when the cold water is turned on.

[0064] In the actual embodiment, when the linkage valve 300 is in the initial position, there is a gap 301 between the linkage valve 300 and the water inlet 112a of the communication chamber 112. Specifically, when the linkage valve 300 is in the initial position, it covers but does not completely block the water inlet 112a of the communication chamber 112, thereby forming a narrow gap 301 between the linkage valve 300 and the water inlet 112a (it should be noted that this gap is not sufficient to keep the water inlet 112a in an open state). When water hammer occurs in the cold water mode, a small part of the water flow in the water inlet chamber 111 of the hot water flow path 110 will enter the communication chamber 112 from the gap 301, thereby realizing the pressure relief of the water inlet chamber 111 and reducing the situation where the pressure in the water inlet chamber 111 is greater than that in the water outlet chamber 113. As a result, the upward force exerted on the linkage valve 300 by the water flow in the water inlet chamber 111 is basically the same as the downward force exerted on the linkage valve 300 by the water flow in the water outlet chamber 113, thereby restricting the water flow in the water inlet chamber 111 from pushing the linkage valve 300 upward and keeping the linkage valve 300 in the initial position. Furthermore, the amount of water leaking from the hot water pipe 50 into the communication chamber 112 is greatly reduced.

[0065] This relatively small amount of water is not sufficient to push open the one-way valve 200, so that the water flow in the hot water pipe 50 will not flow into the cold water flow path 120 in large quantities through the one-way flow path 130. This amount of water is much less than the flow rate at which the hot water supply device 20 starts, thus solving the problem that the water flow in the hot water pipe 50 flows into the cold water flow path 120 due to water hammer in the cold water mode, effectively reducing the situation where the hot water supply device 20 is accidentally started due to an increase in the flow rate of the hot water pipe 50, and realizing that the hot water supply device 20 does not start when cold water is turned on.

[0066] Please refer to Figure 1 and Figure 5 , when the hot water mode is used in the water supply system, the pressure in the water outlet chamber 113 of the hot water flow path 110 in the return water valve 10 decreases and drops below the pressure in the water inlet chamber 111, increasing the pressure difference between the pressure in the water inlet chamber 111 and the pressure in the water outlet chamber 113. The water flow in the water inlet chamber 111 pushes the linkage valve 300 upward, causing the linkage valve 300 to move to the open position. Thus, the water flow in the hot water pipe 50 flows from the hot water flow path 110 through the water inlet chamber 111 to the water outlet chamber 113, and then enters the mixing device 30 from the hot water access end 31 of the mixing device 30 and is supplied to the outlet device 40 through the outlet of the mixing device 30. The flow rate of the hot water pipe 50 increases, and the hot water supply device 20 starts to prepare hot water. At this time, the one-way valve core 210 of the one-way valve 200 is in the closed position under the tension of the return spring 220.

[0067] Please refer to Figure 1 and Figure 6, when the zero - cold - water mode is used in the water supply system, the circulation pump 70 is turned on and pushes the water flow, causing the water pressure in the hot - water pipe 50 to increase. The pressure in the water inlet chamber 111 of the hot - water flow path 110 in the return - water valve 10 increases, thereby pushing the linkage valve 300 upward. When at rest, the pressure in the water inlet chamber 111 and the water outlet chamber 113 of the return - water valve 10 is balanced. At this time, the linkage valve 300 reaches the open position, and the linkage valve 300 opens the water inlet 112a of the communication chamber 112. A large amount of water flow in the hot - water pipe 50 enters the one - way flow path 130, thereby overcoming the acting force of the return spring 220 to push open the one - way valve 200. The water flows through the one - way flow path 130 into the cold - water flow path 120, and then returns to the hot - water supply device 20 through the cold - water flow path 120 and the cold - water pipe 60 for circulating pre - heating.

[0068] In the technical solution of the present invention, by disposing a linkage valve 300 in the hot - water flow path 110 of the return - water valve 10, the linkage valve 300 is adapted to switch between an initial position and an open position. Among them, in the initial position, one end of the linkage valve 300 blocks the water outlet 112b of the communication chamber 112, and a gap 301 is formed between the other end thereof and the water inlet 112a of the communication chamber 112. Thus, when a water - hammer phenomenon occurs in the cold - water mode, a small part of the water flow in the water inlet chamber 111 of the hot - water flow path 110 in the return - water valve 10 can be discharged through the gap 301 into the communication chamber 112 of the hot - water flow path 110, thereby realizing pressure relief for the water inlet chamber 111 to limit the water flow in the water inlet chamber 111 from pushing the linkage valve 300 upward, so that the linkage valve 300 remains in the initial position. Furthermore, the amount of water leaking from the hot - water pipe 50 into the communication chamber 112 is greatly reduced, ensuring that the hot - water supply device 20 will not be accidentally started due to the cross - flow of water volume in the hot - water pipe 50 in this mode, and realizing that the hot - water supply device 20 does not start when the cold water is turned on (for details, please refer to the previous text).

[0069] Please refer to Figure 2 、 Figure 7 and Figure 8 , in an embodiment, the linkage valve 300 includes a valve - core seat 310 disposed in the water outlet chamber 113 for blocking the water outlet 112b of the communication chamber 112, and a valve - core 320 disposed in the communication chamber 112 and linked with the valve - core seat 310; in the initial position, the linkage valve 300 forms the gap 301 between the valve - core 320 and the water inlet 112a of the communication chamber 112.

[0070] Specifically, the valve core seat 310 and the valve core 320 of the linkage valve 300 are linked in the same direction. In the initial position, the linkage valve 300 blocks the water outlet 112b of the communication cavity 112 through the valve core seat 310, and a gap 301 is formed between the valve core 320 of the linkage valve 300 and the water inlet 112a of the communication cavity 112. When the linkage valve 300 moves upward to the open position under the action of the water pressure difference on both sides, the valve core seat 310 of the linkage valve 300 opens the water outlet 112b of the communication cavity 112, and the valve core 320 of the linkage valve 300 opens the water inlet 112a of the communication cavity 112. Vice versa.

[0071] Please refer to Figure 2 , Figure 7 and Figure 8 , as for the way of the linkage setting of the valve core seat 310 and the valve core 320 of the linkage valve 300, there can be various design schemes. For example, in one embodiment, the linkage valve 300 further includes a connecting shaft 330. The connecting shaft 330 has an upper shaft section 331 connected to the valve core seat 310, and a lower shaft section 332 connected to the upper shaft section 331 and inserted into the water outlet cavity 113. The valve core 320 is sleeved on the lower shaft section 332.

[0072] Specifically, a supporting portion 333 is convexly provided on the outer peripheral wall of the connecting shaft 330. The connecting shaft 330 is separated into an upper shaft section 331 and a lower shaft section 332 by the supporting portion 333. The opposite two side surfaces of the supporting portion 333 are respectively adapted to support the valve core seat 310 and the valve core 320. The lower shaft section 332 of the connecting shaft 330 is inserted into the communication cavity 112 through the water outlet 112b from the upper shaft section 331 and is sleeved and fixedly connected with the valve core 320. The valve core seat 310 and the valve core 320 are connected together through the connecting shaft 330, so that the valve core seat 310 and the valve core 320 are linked. In addition, in other embodiments, a connecting portion may also be convexly provided on one of the valve core seat 310 and the valve core 320 to the other, so as to connect these two together through the connecting portion to achieve linkage.

[0073] Please refer to Figure 2 , Figure 7 and Figure 8 , in one embodiment, considering that there may be structural design or assembly errors in the design process of the return water valve 10, after the linkage valve 300 is installed in the hot water flow channel 110 of the return water valve 10, a problem of zero clearance or too large clearance may occur between the valve core 320 of the linkage valve 300 and the water inlet 112a of the communication cavity 112 of the hot water flow channel 110. To reduce the occurrence of this situation, optionally, the length of the valve core 320 sleeved on the lower shaft section 332 is set to be adjustable, so that the size of the gap 301 formed between the valve core 320 and the water inlet 112a of the communication cavity 112 is adjustable. Among them, Figure 3Let h1 denote the length of the valve core 320 sleeved on the lower shaft section 332; let h2 denote the size of the gap 301 between the valve core 320 and the water inlet 112a of the communication cavity 112. The size of the gap 301 refers to the width size in the axial direction of the connecting shaft 330.

[0074] Specifically, the upper end of the valve core 320 is sleeved on the lower shaft section 332, and a gap 301 is formed between the lower end of the valve core 320 and the water inlet 112a of the communication cavity 112. Therefore, by adjusting the length of the upper end of the valve core 320 sleeved on the lower shaft section 332, the distance between the lower end of the valve core 320 and the water inlet 112a of the communication cavity 112 can be adjusted, thereby adjusting the size of the gap 301 formed between the valve core 320 and the water inlet 112a of the communication cavity 112. For example, when the length of the upper end of the valve core 320 sleeved on the lower shaft section 332 is reduced, the lower end of the valve core 320 will approach the water inlet 112a of the communication cavity 112, thereby reducing the distance between the lower end of the valve core 320 and the water inlet 112a of the communication cavity 112, and reducing the gap 301 between the valve core 320 and the water inlet 112a of the communication cavity 112 (that is, when h1 is reduced, h2 is also reduced).

[0075] Please refer to Figure 2 、 Figure 7 and Figure 8 As for the way to realize the adjustable length of the valve core 320 sleeved on the lower shaft section 332, there can be various design methods. In one embodiment, a socket hole 322 sleeved with the lower shaft section 332 is penetrated through one end of the valve core 320, and an adjustment screw hole 323 communicated with the socket hole 322 is penetrated through the other end thereof; the valve core 320 further includes an adjustment screw 340, and the adjustment screw 340 is installed in the adjustment screw hole 323 and is in contact and cooperation with the end face of the lower shaft section 332.

[0076] When the size of the gap 301 needs to be adjusted, rotate the adjustment screw 340. Since the inner end face of the adjustment screw 340 contacts and abuts against the end face of the lower shaft section 332, the relative position of the adjustment screw 340 and the lower shaft section 332 remains unchanged, while the valve core 320 threadedly engaged with the adjustment screw 340 expands and contracts relative to the lower shaft section 332 along its axis, thereby changing the length of the valve core 320 sleeved on the lower shaft section 332 and realizing the adjustable length of the valve core 320 sleeved on the lower shaft section 332.

[0077] Of course, in another embodiment, internal threads can also be directly provided on the inner circumferential surface of the socket hole 322 of the valve core 320, and external threads can be provided on the outer circumferential surface of the lower shaft section 332, so that the internal threads of the valve core 320 are engaged with the external threads of the lower shaft section 332, thereby by directly rotating the valve core 320, the length of the valve core 320 sleeved on the lower shaft section 332 can be changed, and further the adjustable length of the valve core 320 sleeved on the lower shaft section 332 can be realized.

[0078] As for the position of the gap 301 formed between the valve core 320 and the water inlet 112a of the communication cavity 112, optionally, an annular sealing portion 321 is protruded on the outer peripheral wall of the end of the valve core 320 away from the valve core seat 310. At the initial position, a gap 301 is formed between the annular sealing portion 321 and the water inlet 112a of the communication cavity 112. It can be understood that the valve core 320 covers but does not completely block the water inlet 112a of the communication cavity 112 through the annular sealing portion 321, so as to form a narrow gap 301 between the annular sealing portion 321 and the water inlet 112a.

[0079] Please refer to Figure 2 、 Figure 7 and Figure 8 Based on any of the above embodiments, the return water valve 10 further includes a reset member 400. The reset member 400 is used to make the linkage valve 300 have a tendency to reset to the initial position. In this way, after the hot water use of the water outlet device 40 is finished or after the preheating of the hot water in the hot water pipe 50 is finished, etc., the reset member 400 can drive the linkage valve 300 to reset to the initial position. The reset member 400 can also be a spring, a spring piece or a tension spring, etc., which have an elastic structure

[0080] Optionally, the reset member 400 is configured as a second spring 400. One end of the second spring 400 is fixed in the water outlet cavity 113, and the other end of the second spring 400 is connected to the linkage valve 300. The second spring 400 is used to make the valve core of the linkage valve 300 have a tendency to reset to the initial position. In this way, on the one hand, after the hot water use of the water outlet device 40 is finished or after the preheating of the hot water in the hot water pipe 50 is finished, etc., the second spring 400 can drive the linkage valve 300 to reset to the initial position; on the other hand, the second spring 400 can also limit the linkage valve 300 to the initial position to ensure the use stability of the linkage valve 300 at the initial position.

[0081] Please refer to Figure 4 、 Figure 7 and Figure 8, based on any of the above embodiments, the linkage valve 300 further includes a pressure relief member 350. The pressure relief member 350 is elastic and is connected to the valve core seat 310 and the upper shaft section 331. Therefore, when there is a water hammer phenomenon when switching cold water on and off, the pressure in the water inlet chamber 111 of the hot water flow channel 110 of the return water valve 10 increases (increases by about 0.2 - 0.3 MPa). The pressure difference between the water inlet chamber 111 and the water outlet chamber 113 of the hot water flow channel 110 is greater than the tension of the pressure relief member 350, which pushes the valve core 320 of the linkage valve 300 to move slightly upward. The valve core 320 drives the valve core seat 310 to abut against the pressure relief member 350 through the connecting shaft 330, thereby overcoming the tension of the pressure relief member 350 (for example, about 0.1 MPa), so as to ensure that the pressure in the water outlet chamber 113 of the hot water flow channel 110 is not too large, and there is a certain pressure difference at the same time, which can ensure that the linkage valve 300 is better maintained in the initial position and not opened when the cold water is turned on, preventing the problem of water cross - flow after the cold water is turned on. After switching the working mode subsequently, the linkage valve 300 can be easily opened.

[0082] Based on this, due to the existence of the pressure relief member 350, even if there is a water hammer phenomenon when switching cold water on and off in the cold water mode, the pressure in the water outlet chamber 113 of the hot water flow channel 110 is not too large. Therefore, as Figure 6 shown, after the zero - cold - water mode is turned on, the circulating water pump 70 will push the water flow, increasing the pressure in the water inlet chamber 111 of the return water valve 10. The pressure generated by the circulating water pump 70 in the water inlet chamber 111 of the return water valve 10 can better offset the pressure difference, and then push the linkage valve 300 to move upward so that the linkage valve 300 can be normally opened, realizing the water circulation pre - heating. This can effectively reduce the situation that after the zero - cold - water mode is turned on, the linkage valve 300 is locked in the initial position due to the relatively high pressure in the water outlet chamber 113 of the hot water flow channel 110 in the return water valve 10, making it difficult for the linkage valve 300 to be normally opened.

[0083] Please refer to Figure 7 and Figure 8 , for the specific structure of the pressure relief member 350, the pressure relief member 350 can also be an elastic structure such as a spring, a spring sheet or a tension spring, etc. In this embodiment, the pressure relief member 350 is configured as a first spring 350. Optionally, to improve the installation stability of the pressure relief member 350, a first limiting groove 311 is provided on the side of the valve core seat 310 facing the first spring 350; one end of the first spring 350 connected to the valve core seat 310 is installed in the first limiting groove 311. A second limiting groove 334 is also provided at the end of the upper shaft section 331 of the connecting shaft 330 away from the valve core 320; one end of the first spring 350 connected to the upper shaft section 331 is installed in the second limiting groove 334.

[0084] Specifically, the upper end of the first spring 350 is installed in the second limiting groove 334 so that the upper end of the first spring 350 is not easily detached from the connecting shaft 330; the lower end of the first spring 350 is installed in the first limiting groove 311 so that the lower end of the first spring 350 is not easily detached from the valve core seat 310.

[0085] Please refer to Figure 7 and Figure 8 , in an embodiment, the linkage valve 300 further includes a gasket 360, and the gasket 360 is disposed on the lower surface of the valve core seat 310. Specifically, the lower surface of the valve core seat 310 is convexly provided with a mounting portion surrounding the outer periphery of the connecting shaft 330; the gasket 360 is sleeved on the mounting portion 312. The gasket 360 can be made of an elastic material such as rubber, so that the gasket 360 can undergo elastic deformation.

[0086] Please refer to Figure 9 and Figure 10 , when the pressure in the water outlet cavity 113 of the hot water flow channel 110 of the return water valve 10 is higher than the pressure in its water inlet cavity 111, making it difficult for the linkage valve 300 to open normally. Due to the presence of the gasket 360, after the zero cold water mode is turned on, the pressure in the water inlet cavity 111 of the hot water flow channel 110 of the return water valve 10 increases, having a tendency to push the valve core 320 upward. At this time, the valve core 320 will be pressed by the valve core seat 310 on the upper side. However, since the pressure in the water inlet cavity 111 of the hot water flow channel 110 will increase due to the water circulation, the pressure difference between the water inlet cavity 111 and the water outlet cavity 113 becomes smaller (generally, it can be reduced by 0.05 - 0.08 MPa). Through a certain elastic deformation of the gasket 360, during the process of the pressure difference becoming smaller, the valve core 320 can be slightly displaced upward through the connecting shaft 330, but it is not enough to open the water outlet 112b of the communication cavity 112 by the valve core seat 310. Combining with the reserved gap 301 between the valve core 320 and the water inlet 112a of the communication cavity 112, a relatively large opening gap 302 is formed. That is to say, the size of the opening gap 302 is the sum of the gap 301 and the micro-displacement amount of the valve core 320 in this case. Therefore, in this case, even if the linkage valve 300 does not fully open the water inlet 112a of the communication cavity 112, the opening gap 302 can ensure that the circulating flow rate is about 4 L / min, meeting the zero cold water usage requirement.

[0087] Please refer to Figure 4, based on any of the above embodiments, the return water valve 10 further includes a water regulating valve 500. The water regulating valve 500 is installed in the cold water flow channel 120 through the installation port to regulate the water flow rate in the cold water flow channel 120. Optionally, the hot water flow channel 110 is a straight flow channel, and / or the cold water flow channel 120 is a straight flow channel, and / or the one-way flow channel 130 is a straight flow channel. Of course, in other embodiments, any one or more of the hot water flow channel 110, the cold water flow channel 120, and the one-way flow channel 130 may also be provided as an L-shaped flow channel.

[0088] Please refer to Figure 1 , the present invention also provides a water supply system, which includes a hot water supply device 20, a water mixing device 30, and a return water valve 10. Among them, the hot water supply device 20 has a water inlet pipe 21 and a water outlet pipe 22; the hot water access end 31 of the water mixing device 30 is connected to the water outlet pipe 22 through a hot water pipe 50, and the cold water access end 32 of the water mixing device 30 is connected to the water inlet pipe 21 through a cold water pipe 60; the hot water flow channel 110 of the return water valve 10 is connected to the hot water pipe 50, and the cold water flow channel 120 of the return water valve 10 is connected to the cold water pipe 60. The specific structure of the return water valve 10 refers to the above embodiments. Since this water supply system adopts all the technical solutions of the above all embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0089] Optionally, the water supply system further includes a water outlet device 40, and the water outlet device 40 is connected to the output end 33 of the water mixing device 30. The number of the water outlet devices 40 can be one or two or more. When there are two or more water outlet devices 40, a return water valve 10 can be configured for each water outlet device 40, or a return water valve 10 can be configured only for the water outlet device 40 arranged at the farthest end. Of course, in other embodiments, the water outlet device 40 can also be provided by the user himself.

[0090] As for the specific type of the hot water supply device 20, the hot water supply device 20 can be selected as a gas water heater or a gas wall-mounted boiler or an electric water heater, and can be reasonably configured according to market or user needs, and no specific limitation is set here.

[0091] Figures 11 to 22 Schematic diagrams of embodiments of the communication valve, pressure valve assembly and water supply system proposed by the present invention. The Figures 11 to 22For the description of the attached drawing reference numerals, please refer to Table 2 above. The communication valve 80 can be assembled with the return water valve 10 into a pressure valve assembly. When the pressure valve assembly is connected to the cold water pipe 50 and the hot water pipe 60 of the water supply system, a return water waterway can be formed in the water supply system, enabling the water supply system to have a zero cold water mode and solving the problem of hot water flowing into the cold water pipe when the cold water mode of the water supply system is turned on, without changing the basic structure of the return water valve 10. That is to say, the communication valve 80 can be manufactured and produced separately and assembled with the return water valve 10 into a pressure valve assembly for use, without the user having to replace or discard the existing return water valve 10. Of course, the communication valve 80 can also be sold as a complete set assembled with the return water valve 10 into a pressure valve assembly. The return water valve 10 can be an H-shaped return water valve (such as Figure 11 and 12 shown), or it can be a return water valve of other shapes (such as Figure 21 and Figure 22 shown). The communication valve 80 will be introduced in detail below.

[0092] Please refer to Figure 17 and Figure 18 . In an embodiment of the return water valve of the present invention, the communication valve 80 includes a valve body 600 and a linkage valve 300. The valve body 600 is provided with a hot water channel 610. The hot water channel 610 includes a water inlet cavity 611, a communication cavity 612, and a water outlet cavity 613. The communication cavity 612 has a water inlet 612a communicating with the water inlet cavity 611 and a water outlet 612b communicating with the water outlet cavity 613; the hot water channel 610 is also provided with a docking port 603, and the docking port 603 is adapted to communicate with the inlet end of the one-way flow channel 130 of the return water valve 10 to communicate with the cold water flow channel 120 of the return water valve 10 through the one-way flow channel 130. The linkage valve 300 is disposed in the hot water channel 610, and the linkage valve 300 is adapted to switch between an initial position and an open position, wherein: in the initial position, one end of the linkage valve 300 blocks the water outlet 612b, and a gap 301 is formed between the other end of the linkage valve 300 and the water inlet 612a; in the open position, the linkage valve 300 opens both the water inlet 612a and the water outlet 612b.

[0093] Specifically, the linkage valve 300 is installed in the hot water channel 610 of the communication valve 80. The linkage valve 300 is adapted to move from the initial position to the open position when the pressure difference between the water pressure in the water inlet cavity 611 and the water pressure in the water outlet cavity 613 of the hot water channel 610 increases, which has the following two meanings: 1) When the pressure difference between the water pressure in the water inlet cavity 611 and the water pressure in the water outlet cavity 613 starts to increase, the linkage valve 300 moves from the initial position to the open position; 2) When the pressure difference between the water pressure in the water inlet cavity 611 and the water pressure in the water outlet cavity 613 increases to a preset value, the linkage valve 300 moves from the initial position to the open position. In a specific embodiment, the above two design methods can be selected according to actual needs.

[0094] Please refer to Figure 12 , an inlet interface 601 is further provided at the inlet of the hot water passage 610 of the communication valve 80 in its inlet chamber 611, and an outlet interface 602 is provided at the outlet of the outlet chamber 613. To facilitate the introduction of the way of assembling the communication valve 80 and the return water valve 10 into a pressure valve assembly, the basic structure of the return water valve 10 will be described first here. The return water valve 10 includes a valve body 100, and the valve body 100 of the return water valve 10 has a hot water flow passage 110, a cold water flow passage 120, and a one-way flow passage 130 that connects its hot water flow passage 110 and cold water flow passage 120. Among them, the hot water flow passage 110 of the return water valve 10 has a first interface 101 and a second interface 102; the cold water flow passage 120 has a third interface 103 and a fourth interface 104. When the communication valve 80 and the return water valve 10 are assembled, one of the first interface 101 and the second interface 102 of the return water valve 10 is connected to the docking interface 603 of the communication valve 80, and the other is set to be blocked, so that the communication valve 80 and the return water valve 10 can be assembled into a pressure valve assembly. Among them, the docking interface 603 of the communication valve 80 is integrally connected with the first interface 101 and the second interface 102 of the return water valve 10, or the docking interface 603 of the communication valve 80 is detachably connected to the first interface 101 and the second interface 102 of the return water valve 10. Specifically here, the docking interface 603 of the communication valve 80 is detachably connected to the first interface 101 of the return water valve 10; for example, threads are provided at the docking interface 603 of the communication valve 80, so that the docking interface 603 is threadedly connected to the first interface 101 of the return water valve 10.

[0095] When assembling the pressure valve assembly into the water supply system, the inlet interface 601 of the communication valve 80 is connected to the hot water supply device 20 through a hot water pipe 50, and the outlet interface 602 of the communication valve 80 is connected to the hot water access end 31 of the mixing device 30; the third interface 103 of the cold water hot valve 10 is connected to the cold water supply source (such as a water pipe network) through a cold water pipe 60, and the fourth interface 104 is connected to the cold water access end 32 of the mixing device 30. In addition, the water supply system is also equipped with a circulation water pump 70, and the circulation water pump 70 is used to connect the third interface 103 and the hot water supply device 20 to suck cold water. The circulation water pump 70 can be arranged on the pipeline between the heat exchanger of the hot water supply device 20 and the cold water pipe 60. Specifically, the circulation water pump 70 is arranged on the inlet pipe 21 of the hot water supply device 20.

[0096] Since the water supply system is equipped with a pressure valve assembly, the water supply system has at least three working modes: cold water mode, hot water mode, and zero cold water mode. The working principles of these three working modes will be explained below, and for details, please refer to the following text.

[0097] Please refer to Figure 11 and Figure 12, when the water supply system uses the cold water mode, the linkage valve 300 is in the initial position; at this time, the pressure of the cold water flow channel 120 of the return water valve 10 decreases, and the water flow in the cold water pipe 60 flows from the cold water flow channel 120 to the cold water access end 32 of the mixing device 30, and then is supplied to the water outlet device 40 through the output end of the mixing device 30. At this time, the one-way valve core 210 of the one-way valve 200 is in the closed position under the tension of the return spring 220.

[0098] In the above cold water mode, due to the decrease in the pressure of the cold water pipe 60, the pressure of the cold water flow channel 120 of the return water valve 10 will decrease. The water inlet cavity 611 of the hot water channel 610 of the communication valve 80 is connected to the hot water pipe 50, and the pressure of the hot water pipe 50 is higher than that of the cold water pipe 60. The water flow in the hot water pipe 50 has a tendency to enter the cold water flow channel 120 from the water inlet cavity 611, so as to have a tendency to push the linkage valve 300 towards the water outlet cavity 613; in addition, the water outlet cavity 613 of the hot water channel 610 is connected to the hot water access end 31 of the mixing device 30, and the hot water access end 31 is in a closed state, so the water outlet cavity 613 is in a pressure maintaining state. The pressure reduction of the cold water flow channel 120 also causes a pressure difference between the water outlet cavity 613 of the hot water channel 610 and the cold water flow channel 120. Therefore, the water pressure of the water outlet cavity 613 also has a tendency to push the linkage valve 300 towards the water inlet cavity 611, thus offsetting the thrust of the water inlet cavity 611 of the hot water channel 610 on the linkage valve 300, restricting the movement and opening of the linkage valve 300, and keeping the linkage valve 300 in the initial position.

[0099] However, due to the sudden loss of pressure of the water pressure in the cold water flow channel 120 of the return water valve 10, the pressure of the water inlet cavity 611 in the hot water channel 610 of the communication valve 80 is relatively higher than the pressure of the cold water flow channel 120, which easily leads to the situation that the pressure of the water inlet cavity 611 is slightly greater than the pressure of the water outlet cavity 613, resulting in a water hammer phenomenon. In this case, if the linkage valve 300 is in complete sealing fit with the water inlet 612a of the communication cavity 612 with zero clearance, then the acting force exerted by the water flow in the water inlet cavity 611 on the linkage valve 300 in the direction of pushing towards the water outlet cavity 613 will be greater than the acting force exerted by the water flow in the water outlet cavity 613 on the linkage valve 300 in the direction of pushing towards the water inlet cavity 611. Thus, the water flow in the water inlet cavity 611 pushes open the linkage valve 300, causing the linkage valve 300 to open the water inlet 612a of the communication cavity 612. A large amount of water flow in the hot water pipe 50 will enter the communication cavity 612, and then flow from the communication cavity 612 to the hot water flow channel 110 of the return water valve 10 and then to its one-way flow channel 130, and then the one-way valve 200 is pushed open in the one-way flow channel 130 and enters the cold water flow channel 120. The increase in the water flow in the hot water pipe 50 is very likely to trigger the start of the hot water supply device 20, resulting in the situation that the hot water supply device 20 starts when the cold water is turned on.

[0100] In the actual implementation of this embodiment, when the linkage valve 300 is in the initial position, there is a gap 301 between the linkage valve 300 and the water inlet 612a of the communication cavity 612. Specifically, when the linkage valve 300 is in the initial position, it covers but does not completely block the water inlet 612a of the communication cavity 612, thereby forming a narrow gap 301 between the linkage valve 300 and the water inlet 612a (it should be noted that this gap is not sufficient to keep the water inlet 612a in an open state). When a water hammer phenomenon occurs in the cold water mode, a small part of the water flow in the water inlet cavity 611 of the hot water channel 610 of the communication valve 80 will enter the communication cavity 612 from the gap 301, thereby realizing the pressure relief of the water inlet cavity 611 and reducing the situation where the pressure in the water inlet cavity 611 is greater than that in the water outlet cavity 613. As a result, the pushing force exerted on the linkage valve 300 by the water flow in the water inlet cavity 611 in the direction of the water outlet cavity 613 is basically equal to the pushing force exerted on the linkage valve 300 by the water flow in the water outlet cavity 613 in the direction of the water inlet cavity 611, thereby restricting the water flow in the water inlet cavity 611 from pushing open the linkage valve 300 and keeping the linkage valve 300 in the initial position. Furthermore, the amount of water leaking from the hot water pipe 50 into the communication cavity 612 is greatly reduced.

[0101] This relatively small amount of water is not sufficient to push open the check valve 200, so that the water flow in the hot water pipe 50 will not flow into the cold water flow channel 120 in large quantities through the one-way flow channel 130. This amount of water is much smaller than the flow rate at which the hot water supply device 20 starts, thus solving the problem that the water flow in the hot water pipe 50 flows into the cold water flow channel 120 due to the water hammer phenomenon in the cold water mode, effectively reducing the situation where the hot water supply device 20 is accidentally started due to an increase in the flow rate of the hot water pipe 50, and realizing that the hot water supply device 20 does not start when cold water is turned on.

[0102] Please refer to Figure 11 and Figure 13 When the water supply system uses the hot water mode, the pressure in the water outlet cavity 613 of the hot water channel 610 in the communication valve 80 decreases and drops below the pressure in the water inlet cavity 611, increasing the pressure difference between the pressure in the water inlet cavity 611 and the pressure in the water outlet cavity 613. The water flow in the water inlet cavity 611 pushes open the linkage valve 300, causing the linkage valve 300 to move to the open position. Thus, the water flow in the hot water pipe 50 flows from the hot water channel 610 through the water inlet cavity 611 to the water outlet cavity 613, and then enters the mixing device 30 from the hot water access end 31 of the mixing device 30 and is supplied to the water outlet device 40 through the outlet of the mixing device 30. The flow rate of the hot water pipe 50 increases, and the hot water supply device 20 starts to prepare hot water. At this time, the check valve core 210 of the check valve 200 is in the closed position under the tension of the return spring 220.

[0103] Please refer to Figure 11 and Figure 14When the water supply system uses the zero - cold - water mode, the circulation water pump 70 is turned on and drives the water flow, causing the water pressure in the hot - water pipe 50 to increase. The pressure in the water inlet cavity 611 of the hot - water passage 610 in the connection valve 80 increases, thereby pushing the linkage valve 300 upward. When at rest, the pressure in the water inlet cavity 611 and the water outlet cavity 613 of the connection valve 80 is equal. At this time, the linkage valve 300 reaches the open position, and the linkage valve 300 opens the water inlet 612a of the communication cavity 612. A large amount of water flow in the hot - water pipe 50 enters the one - way flow channel 130, thereby overcoming the acting force of the return spring 220 to push open the one - way valve 200. The water flows through the one - way flow channel 130 into the cold - water flow channel 120, and then returns to the hot - water supply device 20 through the cold - water flow channel 120 via the cold - water pipe 60 for circulating heating.

[0104] In the technical solution of the present invention, by configuring a linkage valve 300 in the hot - water passage 610 of the connection valve 80, the linkage valve 300 is adapted to switch between an initial position and an open position. Among them, in the initial position, one end of the linkage valve 300 blocks the water outlet 612b of the communication cavity 612, and a gap 301 is formed between the other end thereof and the water inlet 612a of the communication cavity 612. Thus, when a water hammer phenomenon occurs in the cold - water mode, a small part of the water flow in the water inlet cavity 611 of the hot - water passage 610 in the connection valve 80 can be discharged into the communication cavity 612 of the hot - water passage 610 through the gap 301, thereby realizing pressure relief of the water inlet cavity 611 to limit the water flow in the water inlet cavity 611 from pushing open the linkage valve 300, so that the linkage valve 300 remains in the initial position, and further greatly reducing the amount of water leaking from the hot - water pipe 50 into the communication cavity 612, ensuring that the hot - water supply device 20 will not be accidentally started due to the cross - flow of water volume in the hot - water pipe 50 in this mode, and realizing that the hot - water supply device 20 does not start when opening cold water (for details, please refer to the previous text).

[0105] It can be seen that the water supply system can, on the original basis, only combine the existing return - water valve 10 with the connection valve 80 to solve the problem of accidental start - up of the hot - water supply device 20 caused by the cross - flow of water volume in the hot - water pipe 50, realize that the hot - water supply device 20 does not start when opening cold water, without the need to replace or discard the existing return - water valve 10, nor to change the basic structure of the return - water valve 10.

[0106] Please refer to Figure 17 、 Figure 19 and Figure 20 In an embodiment, the linkage valve 300 includes a valve - core seat 310 disposed in the water outlet cavity 613 for blocking the water outlet 612b of the communication cavity 612, and a valve core 320 disposed in the communication cavity 612 and linked with the valve - core seat 310; in the initial position, the linkage valve 300 forms the gap 301 between the valve core 320 and the water inlet 612a of the communication cavity 612.

[0107] Specifically, the valve core seat 310 and the valve core 320 of the linkage valve 300 are linked in the same direction. In the initial position, the linkage valve 300 blocks the water outlet 612b of the communication cavity 612 through the valve core seat 310, and a gap 301 is formed between the valve core 320 of the linkage valve 300 and the water inlet 612a of the communication cavity 612. When the linkage valve 300 moves upward to the open position under the action of the water pressure difference on both sides, the valve core seat 310 of the linkage valve 300 opens the water outlet 612b of the communication cavity 612, and the valve core 320 of the linkage valve 300 opens the water inlet 612a of the communication cavity 612. Vice versa.

[0108] Please refer to Figure 17 、 Figure 19 and Figure 20 , as for the way of linking the valve core seat 310 and the valve core 320 of the linkage valve 300, there can be various design schemes. For example, in one embodiment, the linkage valve 300 further includes a connecting shaft 330. The connecting shaft 330 has an upper shaft section 331 connected to the valve core seat 310, and a lower shaft section 332 connected to the upper shaft section 331 and inserted into the water outlet cavity 613. The valve core 320 is sleeved on the lower shaft section 332.

[0109] Specifically, a support portion 333 is convexly provided on the outer peripheral wall of the connecting shaft 330. The connecting shaft 330 is separated into an upper shaft section 331 and a lower shaft section 332 by the support portion 333. The opposite side surfaces of the support portion 333 are respectively adapted to support the valve core seat 310 and the valve core 320. The lower shaft section 332 of the connecting shaft 330 is inserted into the communication cavity 612 through the water outlet 612b from the upper shaft section 331 and is fixedly connected with the valve core 320 in a sleeved manner. The valve core seat 310 and the valve core 320 are connected together through the connecting shaft 330, so that the valve core seat 310 and the valve core 320 are linked. In addition, in other embodiments, a connecting portion may be convexly provided on one of the valve core seat 310 and the valve core 320 to the other, so as to connect these two together through the connecting portion to achieve linkage.

[0110] Please refer to Figure 17 、 Figure 19 and Figure 20 , in one embodiment, considering that there may be structural design or assembly errors in the design process of the communication valve 80, after the linkage valve 300 is installed in the hot water channel 610 of the communication valve 80, there may be a problem of zero clearance or excessive clearance between the valve core 320 of the linkage valve 300 and the water inlet 612a of the communication cavity 612 of the hot water channel 610. To reduce the occurrence of this situation, optionally, the length of the valve core 320 sleeved on the lower shaft section 332 is set to be adjustable, so that the size of the gap 301 formed between the valve core 320 and the water inlet 612a of the communication cavity 612 is adjustable. Among them, Figure 18Here, h1 represents the length of the valve core 320 sleeved on the lower shaft section 332; h2 represents the size of the gap 301 between the valve core 320 and the water inlet 612a of the communication cavity 612.

[0111] Specifically, the upper end of the valve core 320 is sleeved on the lower shaft section 332, and a gap 301 is formed between the lower end of the valve core 320 and the water inlet 612a of the communication cavity 612. Therefore, by adjusting the length of the upper end of the valve core 320 sleeved on the lower shaft section 332, the distance between the lower end of the valve core 320 and the water inlet 612a of the communication cavity 612 can be adjusted, thereby adjusting the size of the gap 301 formed between the valve core 320 and the water inlet 612a of the communication cavity 612. For example, when the length of the upper end of the valve core 320 sleeved on the lower shaft section 332 is reduced, the lower end of the valve core 320 will approach the water inlet 612a of the communication cavity 612, thereby reducing the distance between the lower end of the valve core 320 and the water inlet 612a of the communication cavity 612, and reducing the gap 301 between the valve core 320 and the water inlet 612a of the communication cavity 612 (that is, when h1 is reduced, h2 is also reduced). It should be noted that the size of the gap 301 refers to the width in the axial direction of the connecting shaft 330.

[0112] Please refer to Figure 17 、 Figure 19 and Figure 20 As for the way to realize the adjustable length of the valve core 320 sleeved on the lower shaft section 332, there can be various design methods. In one embodiment, one end of the valve core 320 is provided with a socket hole 322 sleeved with the connecting shaft 330, and the other end is provided with an adjusting screw hole 323 communicating with the socket hole 322; the valve core 320 further includes an adjusting screw 340, and the adjusting screw 340 is installed in the adjusting screw hole 323 and is in contact and cooperation with the end face of the lower shaft section 332.

[0113] When it is necessary to adjust the size of the gap 301, rotate the adjusting screw 340. Since the inner end face of the adjusting screw 340 contacts and abuts against the end face of the lower shaft section 332, the relative position of the adjusting screw 340 and the lower shaft section 332 remains unchanged, while the valve core 320 threadedly engaged with the adjusting screw 340 expands and contracts along its axis relative to the lower shaft section 332, thereby changing the length of the valve core 320 sleeved on the lower shaft section 332 and realizing the adjustable length of the valve core 320 sleeved on the lower shaft section 332.

[0114] Of course, in another embodiment, internal threads can also be directly provided on the inner peripheral surface of the socket hole 322 of the valve core 320, and external threads can be provided on the outer peripheral surface of the lower shaft section 332, so that the internal threads of the valve core 320 are engaged with the external threads of the lower shaft section 332. Thus, by directly rotating the valve core 320, the length of the valve core 320 sleeved on the lower shaft section 332 can be changed, and further, the length of the valve core 320 sleeved on the lower shaft section 332 can be adjusted.

[0115] Regarding the position of the gap 301 formed between the valve core 320 and the water inlet 612a of the communication cavity 612, optionally, an annular sealing portion 321 is convexly provided on the outer peripheral wall of the end of the valve core 320 away from the valve core seat 310. In the initial position, a gap 301 is formed between the annular sealing portion 321 and the water inlet 612a of the communication cavity 612. It can be understood that the valve core 320 covers but does not completely seal the water inlet 612a of the communication cavity 612 through the annular sealing portion 321, so as to form a narrow gap 301 between the annular sealing portion 321 and the water inlet 612a.

[0116] Please refer to Figure 17 、 Figure 19 and Figure 20 Based on any of the above embodiments, the communication valve 80 further includes a reset member 400, and the reset member 400 is used to make the linkage valve 300 have a tendency to reset to the initial position. In this way, after the hot water use of the water outlet device 40 ends or after the preheating of the hot water in the hot water pipe 50 ends, etc., the reset member 400 can drive the linkage valve 300 to reset to the initial position. The reset member 400 can also be an elastic structure such as a spring, a spring sheet or a tension spring.

[0117] Optionally, the reset member 400 is configured as a second spring 400. One end of the second spring 400 is fixed in the water outlet cavity 613, and the other end of the second spring 400 is connected to the linkage valve 300. The second spring 400 is used to make the valve core of the linkage valve 300 have a tendency to reset to the initial position. In this way, on the one hand, after the hot water use of the water outlet device 40 ends or after the preheating of the hot water in the hot water pipe 50 ends, etc., the second spring 400 can drive the linkage valve 300 to reset to the initial position; on the other hand, the second spring 400 can also limit the linkage valve 300 to the initial position to ensure the use stability of the linkage valve 300 in the initial position.

[0118] Please refer to Figure 12 、 Figure 19 and Figure 20, Based on any of the above embodiments, the linkage valve 300 further includes a pressure relief member 350. The pressure relief member 350 is elastic and is connected to the valve core seat 310 and the upper shaft section 331. Therefore, when there is a water hammer phenomenon when switching on cold water, the pressure in the water inlet chamber 611 of the hot water connecting valve 80 increases (by about 0.2 - 0.3 MPa). At this time, the pressure in the water inlet chamber 611 of the hot water passage 610 correspondingly increases, and the pressure difference between the water inlet chamber 611 and the water outlet chamber 613 of the hot water passage 610 will be greater than the force of the pressure relief member 350, pushing the valve core 320 of the linkage valve 300 to move slightly upward. The valve core 320 drives the valve core seat 310 to abut against the pressure relief member 350 through the connecting shaft 330, thereby overcoming the tension of the pressure relief member 350 (such as about 0.1 MPa), so as to ensure that the pressure in the water outlet chamber 613 of the hot water passage 610 will not be too large, and there is a certain pressure difference, which can ensure that the linkage valve 300 is better maintained in the initial position and not opened when the cold water is turned on, preventing the problem of water cross - flow after the cold water is turned on. After switching the working mode subsequently, the linkage valve 300 can be easily opened.

[0119] Based on this, due to the presence of the pressure relief member 350, even if there is a water hammer phenomenon when switching on cold water in the cold water mode, the water outlet chamber 613 of the hot water passage 610 can be relieved of pressure in time, and the pressure in the water outlet chamber 613 will not be too large. Therefore, as Figure 14 shown, after the zero - cold - water mode is turned on, the circulating water pump 70 will push the water flow, increasing the pressure in the water inlet chamber 611 of the connecting valve 80. The pressure generated by the circulating water pump 70 in the water inlet chamber 611 of the connecting valve 80 can better offset the pressure difference, and then push the linkage valve 300 upward to move so that the linkage valve 300 can be normally opened, realizing the water circulation pre - heating. This can effectively reduce the situation that after the zero - cold - water mode is turned on, the linkage valve 300 is locked in the initial position due to the relatively high pressure in the water outlet chamber 113 of the hot water flow passage 110 in the return valve 10, making it difficult for the linkage valve 300 to be normally opened.

[0120] Please refer to Figure 19 and Figure 20 , For the specific structure of the pressure relief member 350, the pressure relief member 350 can also be an elastic structure such as a spring, a spring piece or a tension spring, etc. In this embodiment, the pressure relief member 350 is configured as the first spring 350. Optionally, to improve the installation stability of the pressure relief member 350, a first limiting groove 311 is provided on the side of the valve core seat 310 facing the first spring 350; one end of the first spring 350 connected to the valve core seat 310 is installed in the first limiting groove 311. A second limiting groove 334 is also provided at the end of the upper shaft section 331 of the connecting shaft 330 away from the valve core 320; one end of the first spring 350 connected to the upper shaft section 331 is installed in the second limiting groove 334.

[0121] Specifically, the upper end of the first spring 350 is installed in the second limiting groove 334 so that the upper end of the first spring 350 is not easily detached from the connecting shaft 330; the lower end of the first spring 350 is installed in the first limiting groove 311 so that the lower end of the first spring 350 is not easily detached from the valve core seat 310.

[0122] Please refer to Figure 19 and Figure 20 In an embodiment, the linkage valve 300 further includes a gasket 360, and the gasket 360 is disposed on the lower surface of the valve core seat 310. Specifically, an installation portion surrounding the outer periphery of the connecting shaft 330 protrudes from the lower surface of the valve core seat 310; the gasket 360 is sleeved on the installation portion 312. The gasket 360 can be made of an elastic material such as rubber, so that the gasket 360 can undergo elastic deformation.

[0123] Please refer to Figure 15 and Figure 16 When the pressure in the water outlet cavity 613 of the hot water passage 610 of the communication valve 80 is higher than the pressure in its water inlet cavity 611, making it difficult for the linkage valve 300 to open normally, due to the presence of the gasket 360, after the zero cold water mode is turned on, the pressure in the water inlet cavity 611 of the hot water passage 610 of the communication valve 80 increases, having a tendency to push the valve core 320 upward. At this time, the valve core 320 will be pressed by the upper valve core seat 310. However, since the pressure in the water inlet cavity 611 of the hot water passage 610 will increase due to water circulation, the pressure difference between the water inlet cavity 611 and the water outlet cavity 613 becomes smaller (generally, it can be reduced by 0.05 - 0.08 MPa). Through a certain elastic deformation of the gasket 360, the valve core 320 can be slightly displaced upward through the connecting shaft 330 during the process of the pressure difference becoming smaller, but it is not enough to open the water outlet 612b of the communication cavity 612 by the valve core seat 310. Combining with the reserved gap 301 between the valve core 320 and the water inlet 612a of the communication cavity 612, a relatively large opening gap 302 is formed. That is to say, the size of the opening gap 302 is the sum of the gap 301 and the micro-displacement amount of the valve core 320 in this case. Therefore, in this case, even if the linkage valve 300 does not completely open the water inlet 612a of the communication cavity 612, the opening gap 302 can ensure that the circulating flow rate is about 4 L / min, meeting the zero cold water usage requirement.

[0124] Please refer to Figure 12 The present invention further provides a pressure valve assembly, and the pressure valve assembly includes a return water valve 10 and the communication valve 80; the specific structure of the communication valve 80 refers to the above embodiment. Since this pressure valve assembly adopts all the technical solutions of the above embodiments, it also has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated here one by one.

[0125] Optionally, the return water valve 10 can be an H-shaped return water valve (as Figure 12 shown), or it can be a return water valve of other shapes (as Figure 21 and Figure 22 shown). The return water valve 10 has a hot water flow channel 110, a cold water flow channel 120, and a one-way flow channel 130 that connects the hot water flow channel 110 and the cold water flow channel 120; wherein, the docking port 603 of the connection valve 80 is connected to the inlet end of the one-way flow channel 130.

[0126] Specifically herein, the hot water flow channel 110 has a first interface 101 and a second interface 102. One of the first interface 101 and the second interface 102 is set to be blocked, and the other is connected to the docking port 603 of the connection valve 80, so that the docking port 603 of the connection valve 80 is connected to the inlet end of its one-way flow channel (130) through the hot water flow channel 110 of the return water valve 10. Optionally, the first interface 101 of the hot water flow channel 110 is connected to the docking port 603 of the connection valve 80, and the second interface 102 of the hot water flow channel 110 is set to be blocked. The connection manner between the first interface 101 of the hot water flow channel 110 and the docking port 603 of the connection valve 80 can be but is not limited to: threads are provided at both the docking port 603 and the first interface 101 of the return water valve 10, so that the docking port 603 is threadedly connected to the first interface 101. In other embodiments, the second interface 102 of the hot water flow channel 110 can also be connected to the docking port 603 of the connection valve 80, and the first interface 101 of the hot water flow channel 110 is set to be blocked.

[0127] As for the blocking manner of blocking the first interface 101 or the second interface 102 of the return water valve 10, there can be various design manners. For example, in one embodiment, the pressure valve assembly further includes a sealing cover 140, and the sealing cover 140 is suitable for covering one of the first interface 101 and the second interface 102 of the return water valve 10, so that the other is connected to the docking port 603 of the connection valve 80.

[0128] Specifically, the sealing cover 140 covers the second interface 102 of the return water valve 10, and the first interface 101 of the return water valve 10 is connected to the docking port 603 of the connection valve 80. In addition, in other embodiments, a plug can also be configured for the pressure valve assembly, and the second interface 102 of the return water valve 10 is blocked by using the plug, so that the second interface 102 can also be blocked.

[0129] Please refer to Figure 12 , based on any of the above embodiments, the return water valve 10 further includes a water regulating valve 500. The water regulating valve 500 is installed in the cold water flow channel 612 through the installation port to regulate the water flow rate in the cold water flow channel 612. Optionally, the hot water flow channel 110 of the return water valve 10 is a straight flow channel, and / or the cold water flow channel 120 of the return water valve 10 is a straight flow channel, and / or the one-way flow channel 130 of the return water valve 10 is a straight flow channel.

[0130] The present invention also provides a water supply system. Please refer to Figure 11 and Figure 16 , Figure 11 and Figure 16 are schematic diagrams of two embodiments of the water supply system. The water supply system includes a hot water supply device 20, a water mixing device 30, and a pressure valve assembly. Among them, the hot water supply device 20 has a water inlet pipe 21 and a water outlet pipe 22; the hot water access end 31 of the water mixing device 30 is connected to the water outlet pipe 22 through a hot water pipe 50, and the cold water access end 32 of the water mixing device 30 is connected to the water inlet pipe 21 through a cold water pipe 60; in the pressure valve assembly, the hot water channel 610 of the communication valve 80 is connected to the hot water pipe 50, and the cold water flow channel 120 of the return water valve 10 in the pressure valve assembly is connected to the cold water pipe 60. For the specific structure of the pressure valve assembly, refer to the above-mentioned embodiment. Since this water supply system adopts all the technical solutions of the above-mentioned embodiments, it also has all the beneficial effects brought by the technical solutions of the above-mentioned embodiments, which will not be elaborated here one by one.

[0131] It is worth mentioning that based on the fact that the pressure valve assembly includes a return water valve 10 and a communication valve 80, the return water valve 10 can be selected as an H-type return water valve, as shown in Figure 11 ; or, the return water valve 10 can be selected as a return water valve of other shapes, as shown in Figure 16 . The return water valve 10 can be provided by the user himself or provided by the manufacturer as a supporting part.

[0132] Optionally, the water supply system further includes a water outlet device 40, and the water outlet device 40 is connected to the output end 33 of the water mixing device 30. The number of the water outlet devices 40 can be one or two or more. When there are two or more water outlet devices 40, a pressure valve assembly can be configured for each water outlet device 40, or a pressure valve assembly can be configured only for the water outlet device 40 arranged at the farthest end. Of course, in other embodiments, the water outlet device 40 can also be provided by the user himself.

[0133] As for the specific type of the hot water supply device 20, the hot water supply device 20 can be selected as a gas water heater or a gas wall-mounted boiler or an electric water heater, and can be reasonably configured according to market or user needs, and no specific limitation is set here.

[0134] The above are only optional embodiments of the present invention, and do not limit the patent scope of the present invention accordingly. All equivalent structural transformations made under the inventive concept of the present invention by using the content of the specification and drawings of the present invention, or directly / indirectly applied in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A return water valve, characterized in that, The return valve comprises: A valve body, wherein the valve body is provided with a hot water flow channel, a cold water flow channel and a one-way flow channel; the hot water flow channel includes a water inlet chamber, a connecting chamber and a water outlet chamber, the connecting chamber has a water inlet connected to the water inlet chamber, and a water outlet connected to the water outlet chamber; the one-way flow channel connects the connecting chamber with the cold water flow channel; and A linkage valve, the linkage valve is arranged in the hot water flow channel, and the linkage valve is suitable for switching between an initial position and an open position; wherein: In the initial position, one end of the linkage valve blocks the water outlet, and a gap is formed between the other end of the linkage valve and the water inlet; In the open position, the linkage valve opens both the water inlet and the water outlet; The water return valve further includes a reset element, which is used to allow the linkage valve to have a tendency to reset to the initial position, and the reset element is configured as a second spring.

2. The water return valve according to claim 1, characterized in that, The linkage valve comprises: a valve core seat, the valve core seat being disposed in the water outlet cavity and used for blocking the water outlet; and A valve core is arranged in the communicating cavity and is linked with the valve core seat. In the initial position, the linked valve forms the gap between the valve core and the water inlet.

3. The return water valve according to claim 2, wherein, The linkage valve also includes a connecting shaft, which has an upper shaft section connected to the valve core seat and a lower shaft section connected to the upper shaft section and inserted into the water outlet cavity, and the valve core ring is sleeved on the lower shaft section.

4. The return water valve according to claim 3, characterized in that, The length of the valve core ring sleeve on the lower shaft section is adjustable, so that the size of the gap formed between the valve core and the water inlet is adjustable.

5. The return water valve according to claim 4, characterized in that, One end of the valve core is provided with a sleeve hole sleeved with the connecting shaft, and the other end thereof is provided with an adjusting screw hole communicated with the sleeve hole; The linkage valve also includes an adjusting screw, which is installed in the adjusting screw hole and contacts and cooperates with the end surface of the connecting shaft.

6. The return water valve according to claim 3, characterized in that, The linkage valve further comprises a pressure relief member, which is elastic and connects the valve core seat and the upper shaft section of the connecting shaft.

7. The return water valve according to claim 6, wherein, The pressure relief member is configured as a first spring, one end of the first spring is connected to the valve core seat, and the other end of the first spring is connected to an end of the upper shaft section away from the upper shaft section.

8. The return water valve according to claim 7, characterized in that, A first limiting groove is arranged on the side of the valve core seat facing away from the valve core; one end of the first spring connected to the valve core seat is installed in the first limiting groove.

9. The return water valve according to claim 7, characterized in that, A second limiting groove is provided at one end of the upper shaft section of the connecting shaft away from the valve core; and one end of the first spring connected to the upper shaft section is installed in the second limiting groove.

10. The water return valve according to any one of claims 2 to 9, characterized in that, An annular sealing portion is convexly provided on the outer peripheral wall of one end of the valve core away from the valve core seat, and in the initial position, the gap is formed between the annular sealing portion of the valve core and the water inlet.

11. The return water valve according to any one of claims 2 to 9, characterized in that, The linkage valve further comprises a sealing gasket, and the sealing gasket is arranged on the lower surface of the valve core seat.

12. The water return valve according to any one of claims 3 to 9, characterized in that, A supporting portion is convexly disposed on the outer peripheral wall of the connecting shaft, and the supporting portion divides the connecting shaft into an upper shaft section and a lower shaft section. Two opposite side surfaces of the supporting portion are respectively suitable for supporting the valve core seat and the valve core.

13. The water return valve according to any one of claims 1 to 9, characterized in that, The return water valve further includes a check valve, which is arranged in the one-way flow channel for guiding the water flow in the hot water flow channel to flow unidirectionally towards the cold water flow channel during return water.

14. A water supply system, characterized in that, The water supply system includes: A hot water supply device having a hot water outlet; A water mixing device, the hot water access end of the water mixing device is communicated with the hot water outlet through a hot water pipe, and the cold water access end of the water mixing device is communicated with a cold water source through a cold water pipe; and The return water valve according to any one of claims 1 to 13, the hot water flow channel of the return water valve is connected to the hot water pipe, and the cold water flow channel of the return water valve is connected to the cold water pipe.

15. The water supply system according to claim 14, characterized in that, The hot water supply device is a gas water heater or a gas wall-mounted boiler or an electric water heater.

16. A connecting valve, characterized in that, The connection valve includes: A valve body provided with a hot water channel; the hot water channel includes a water inlet chamber, a communication chamber and a water outlet chamber, the communication chamber has a water inlet communicating with the water inlet chamber and a water outlet communicating with the water outlet chamber; the communication chamber is further provided with an interface adapted to communicate with the inlet end of the one-way flow channel of the return water valve to communicate with the cold water flow channel of the return water valve through the one-way flow channel; and A linkage valve arranged in the hot water channel, the linkage valve is adapted to switch between an initial position and an open position; wherein: In the initial position, one end of the linkage valve blocks the water outlet, and a gap is formed between the other end of the linkage valve and the water inlet; In the open position, the linkage valve opens both the water inlet and the water outlet; The connection valve further includes a reset member for making the linkage valve have a tendency to reset to the initial position, and the reset member is configured as a second spring.

17. The communication valve according to claim 16, wherein The linkage valve includes: A valve core seat arranged in the water outlet chamber for blocking the water outlet; and A valve core arranged in the communication chamber and linked with the valve core seat. In the initial position, the linkage valve forms the gap between the valve core and the water inlet.

18. The connecting valve according to claim 17, characterized in that, The linkage valve further includes a connecting shaft having an upper shaft section connected to the valve core seat and a lower shaft section connected to the upper shaft section and inserted into the water outlet chamber, and the valve core is sleeved on the lower shaft section.

19. The communication valve according to claim 18, wherein, The length of the valve core sleeved on the lower shaft section is adjustable so that the size of the gap formed between the valve core and the water inlet is adjustable.

20. The communicating valve according to claim 19, wherein, One end of the valve core is provided with a socket hole sleeved with the connecting shaft, and the other end is provided with an adjusting screw hole communicating with the socket hole; The linkage valve further includes an adjusting screw installed in the adjusting screw hole and in contact and cooperation with the end face of the connecting shaft.

21. The communicating valve according to claim 18, wherein, The linkage valve further includes a pressure relief member having elasticity, and the pressure relief member connects the valve core seat and the upper shaft section of the connecting shaft.

22. The connecting valve according to any one of claims 17 to 21, characterized in that, The linkage valve further includes a gasket arranged on the lower surface of the valve core seat.

23. A pressure valve assembly, characterized in that, The pressure valve assembly includes: A return water valve; and The connection valve according to any one of claims 16 to 22; Wherein, the return water valve has a hot water flow channel, a cold water flow channel and a one-way flow channel connecting the hot water flow channel and the cold water flow channel. Wherein, the docking port of the connecting valve is communicated with the inlet end of the one-way flow channel.

24. The pressure valve assembly according to claim 23, wherein, The hot water flow channel of the return water valve has a first interface and a second interface, and one of the first interface and the second interface is set to be blocked, and the other is connected to the docking port of the connecting valve to communicate the docking port with the inlet end of the one-way flow channel.

25. The pressure valve assembly according to claim 24, wherein The pressure valve assembly further includes a cover, and the cover is adapted to cover one of the first interface and the second interface of the return water valve, so that the other is connected to the docking port of the connecting valve.

26. A water supply system, characterized in that, The water supply system includes: A hot water supply device having a water inlet pipe and a water outlet pipe; A water mixing device, the hot water access end of the water mixing device is communicated with the water outlet pipe through a hot water pipe, and the cold water access end of the water mixing device is communicated with the water inlet pipe through a cold water pipe; and The pressure valve assembly according to claim 23 or 24, wherein the hot water channel of the connecting valve in the pressure valve assembly is connected to the hot water pipe, and the cold water flow channel of the return water valve in the pressure valve assembly is connected to the cold water pipe.

27. The water supply system according to claim 26, wherein The hot water supply device is a gas water heater or a gas wall-mounted boiler or an electric water heater.

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