CN114458796A - Water return valve and water supply system - Google Patents

Abstract

The invention discloses a water return valve and a water supply system, wherein the water return valve comprises a valve body, a temperature control switch, a first check valve and a second check valve, the valve body is provided with a first flow passage and a second flow passage which are arranged at intervals, and a third flow passage and a fourth flow passage which are respectively communicated with the first flow passage and the second flow passage, the temperature control switch is arranged in the valve body, and at least part of the temperature control switch is arranged in the third flow passage and is used for blocking the third flow passage when the temperature of water in a water passage rises to a preset temperature; the first check valve is at least partially arranged in the third flow passage and is used for guiding water in the first flow passage into the second flow passage in a one-way mode; the second one-way valve is at least partially arranged in the fourth flow channel and used for guiding the water in the first flow channel into the second flow channel in a one-way mode. Therefore, the water supply system can realize the function of supplying water with zero cold water and can also realize the prevention of water leakage when pressurized hot water is delivered.

Description

Water return valve and water supply system

Technical Field

The invention relates to the technical field of zero-cold-water supply, in particular to a water return valve and a water supply system.

Background

The water supply system, such as a water supply system of a water heater or a water supply system of a wall-mounted boiler, is used for providing water for users, and generally comprises a gas heating device (such as a gas water heater or a wall-mounted boiler), a cold water pipe, a hot water pipe, a water mixing device and a water outlet end, wherein the water outlet end is connected with the gas heating device through the cold water pipe, the hot water pipe and the water mixing device.

In the related art, in order to make the water supply system have a zero cold water function, a return valve having a check valve is generally added to the water supply system, and the return valve is connected to a cold water pipe and a hot water pipe to form a return water path in the water supply system.

With the above water supply system, in some cases, such as when the outlet end of the water supply system uses hot water alone and the pressure is increased to supply water, the hot water in the hot water pipe or the return water pipe may be mixed into the cold water pipe through the check valve.

Disclosure of Invention

The invention mainly aims to provide a water return valve, and aims to solve the technical problem that when hot water is used at a water outlet end of a water supply system and water is delivered by pressurizing, hot water in a hot water pipe or a water return pipe of the water supply system is easy to flow into a cold water pipe through the water return valve in the related art.

In order to achieve the above object, the present invention provides a water return valve, including:

the valve body is provided with a waterway flow passage, the waterway flow passage comprises a first flow passage and a second flow passage which are arranged at intervals, and a third flow passage and a fourth flow passage which are respectively communicated with the first flow passage and the second flow passage, and the third flow passage and the fourth flow passage are arranged at intervals;

the temperature control switch is arranged in the waterway flow passage, and at least part of the temperature control switch is arranged in the third flow passage so as to be used for blocking the third flow passage when the temperature of water in the waterway flow passage rises to a preset temperature;

the first one-way valve is at least partially arranged in the third flow channel and used for guiding the water in the first flow channel into the second flow channel in a one-way mode; and

and at least part of the second one-way valve is arranged in the fourth flow channel and is used for guiding the water in the first flow channel into the second flow channel in a one-way mode.

Optionally, the temperature control switch includes an adjusting valve core and a temperature control driving assembly, the adjusting valve core is movably disposed in the third flow channel, and the adjusting valve core has an initial position for opening the third flow channel and a blocking position for blocking the third flow channel;

the temperature control driving assembly is installed in the waterway runner and used for driving the adjusting valve core to move from the initial position to the blocking position when the water temperature in the waterway runner rises to the preset temperature so as to block the third runner.

Optionally, a sealing ring protrusion is convexly arranged on the inner wall surface of the third flow passage, the temperature control switch is arranged on one side of the sealing ring protrusion, and in the initial position, the adjusting valve core and the sealing ring protrusion are arranged at an interval to open the third flow passage; and when the valve core is at the blocking position, the adjusting valve core blocks the convex sealing ring to block the third flow passage.

Optionally, in the blocking position, an end surface of the adjusting valve core, which faces the sealing ring protrusion, abuts against an end surface of the sealing ring protrusion, which faces the adjusting valve core, so that the adjusting valve core is blocked by the sealing ring protrusion; alternatively, the first and second electrodes may be,

when the valve plug is in the blocking position, one end of the adjusting valve core can be slidably and hermetically inserted into the inner side of the sealing ring boss.

Optionally, the temperature control driving assembly includes a driving rod, the regulating valve core is mounted on the driving rod, and the driving rod is configured to extend when the temperature of the water in the waterway channel rises to the preset temperature, so as to drive the regulating valve core to move from the initial position to the blocking position.

Optionally, the temperature control driving assembly further includes a temperature sensing shell and a temperature sensing medium that expands when heated, the temperature sensing shell is disposed in the waterway flow channel, the driving rod is slidably mounted in the temperature sensing shell, the temperature sensing medium is disposed in the temperature sensing shell, and the temperature sensing medium is configured to expand when heated to extend the driving rod and to contract when cooled.

Optionally, the thermostatic drive assembly further comprises a first elastic member for providing the regulating valve core with a tendency to return to the initial position.

Optionally, the water return valve further includes a second elastic member, the temperature sensing shell is movably disposed in the waterway channel, and the second elastic member is configured to make the temperature sensing shell have a tendency of moving toward a direction close to the first one-way valve.

Optionally, the first flow channel includes a first flow segment, one end of the first flow segment is provided with a first flow port, the other end of the first flow segment is communicated with the third flow channel, and the extending direction of the first flow segment is the same as the extending direction of the third flow channel; the temperature control switch is arranged in the first flow section and the third flow channel.

Optionally, the water return valve further includes an outer joint, the outer joint is detachably mounted at the first flow port, the second elastic member is a second return spring, the second return spring is sleeved outside the temperature sensing shell, one end of the second return spring abuts against the outer joint, and the other end of the second return spring is connected to the temperature sensing shell, so that the temperature sensing shell has a tendency of moving towards a direction close to the check valve.

Optionally, the first check valve is arranged on one side of the sealing ring which is convex and far away from the temperature control switch.

Optionally, the opening threshold of the first one-way valve is smaller than the opening threshold of the second one-way valve.

Optionally, the second one-way valve includes a second valve core, a second elastic reset member and a plug, and the second valve core is movably disposed in the fourth flow passage to open or block the fourth flow passage;

the valve body is provided with a mounting opening corresponding to the flow opening of the fourth flow passage, the plug is detachably mounted in the mounting opening, and the second elastic reset piece is arranged between the second valve core and the plug, so that the second valve core has the tendency of resetting to the position for blocking the fourth flow passage.

Optionally, an adjusting groove is formed at a flow port of the fourth flow passage, the second valve core is movably arranged in the adjusting groove, and the second valve core is abutted against the bottom of the adjusting groove to block the fourth flow passage.

Optionally, the position of the choke plug in the movable direction of the second valve core is adjustable.

The invention also proposes a water supply system comprising:

a gas heating device;

the water outlet end is connected with the gas water heater through a cold water pipe, a hot water pipe and a water mixing device; and

the water return valve has a first flow passage connected to the hot water pipe and a second flow passage connected to the cold water pipe.

Optionally, the gas heating device is a gas water heater or a gas wall-hanging stove.

The invention also proposes a water supply system comprising:

a gas heating device;

the water outlet end is connected with the gas water heater through a cold water pipe, a hot water pipe and a water mixing device;

the second flow passage of the water return valve is connected to the cold water pipe or the water inlet pipe of the fuel gas heating device; and

and one end of the water return pipe is connected to the hot water pipe, and the other end of the water return pipe is connected to the first flow channel of the water return valve.

According to the water return valve, the third flow passage and the fourth flow passage which are arranged at intervals in the valve body are respectively communicated with the first flow passage and the second flow passage, the temperature control switch is additionally arranged in the valve body, and the on-off of the third flow passage and the fourth flow passage can be respectively and automatically controlled by utilizing the temperature change and the water pressure change of water flow in the water passage, so that the water supply system can realize a zero-cold-water supply function, and the condition that pressurized water is mixed when the water supply system starts pressurized and supplies hot water (namely, the condition that hot water in a hot water pipe or a return water pipe of the water supply system is easy to flow into a cold water pipe through the water return valve) can be prevented, so that the pressurizing effect is ensured.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

FIG. 1 is a schematic structural diagram of a unified embodiment of a water supply system according to the present invention;

FIG. 2 is a schematic structural view of another embodiment of the water supply system of the present invention;

FIG. 3 is a schematic structural diagram of a water return valve according to an embodiment of the present invention;

FIG. 4 is a schematic structural diagram of the water return valve in FIG. 3 in a cold circulation state;

FIG. 5 is a schematic structural diagram of the water return valve in FIG. 3 in a hot circulation state;

FIG. 6 is a schematic structural diagram of the water return valve in FIG. 3 in a hot pressurized state.

The reference numbers illustrate:

the implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.

Detailed Description

The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

It should be noted that if the description of "first", "second", etc. is provided in the embodiment of the present invention, the description of "first", "second", etc. is only for descriptive purposes and is not to be construed as indicating or implying relative importance or implicitly indicating the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature.

In addition, the meaning of "and/or" appearing throughout is to include three juxtapositions, exemplified by "A and/or B" including either scheme A, or scheme B, or a scheme in which both A and B are satisfied.

The invention provides a water return valve and a water supply system.

As shown in fig. 1 and 2, the water return valve 100 is used in a water supply system 1000, that is, the water supply system 1000 includes the water return valve 100, so that the water supply system 1000 has a zero-cold-water function, and thus, a timed cruise function and a heat preservation function are achieved. The water return valve 100 will be described in detail below with reference to the structure of a water supply system 1000, and optionally, the water supply system 1000 is a water supply system 1000 of a water heater (including but not limited to a gas water heater system) or a water supply system 1000 of a wall-hanging stove, etc., and the gas water heater system is taken as an example for description below.

In an embodiment of the present invention, as shown in fig. 1 and 2, the water supply system 1000 further includes a gas heating device 200, a cold water pipe 300, a hot water pipe 400, a water mixing device 600, a water outlet 700, a water return valve 100, and the like, wherein the water outlet 700 is connected to the gas heating device 200 through the cold water pipe 300, the hot water pipe 400, and the water mixing device 600; the return valve 100 is installed in a water path of the water supply system 1000 to form a return water path for providing the water supply system 1000 with a zero-cold water function.

Specifically, as shown in fig. 1 and 2, the gas heating device 200 has a cold water inlet 201 and a hot water outlet 202, and the water mixing device 600 has a hot water inlet, a cold water inlet, and a water mixing outlet.

Wherein, one end of the cold water pipe 300 and the cold water inlet 201 are both connected (i.e. communicated) with a water supply pipe (such as a tap water pipe, etc.), and the other end of the cold water pipe 300 is communicated with a cold water inlet; one end of the hot water pipe 400 is communicated with the hot water outlet 202, the other end is communicated with the hot water inlet, and the mixed water outlet is communicated with the water outlet end 700. Thus, the mixing device 600 can be adjusted to allow the outlet end 700 to deliver cold water alone or mixed hot water at an appropriate temperature.

Optionally, a cold water joint is arranged at the cold water inlet 201; and/or a hot water joint is arranged at the hot water outlet 202.

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

Optionally, the water outlet end 700 may be a shower or a faucet.

Optionally, the water outlet end 700 may be provided in plurality.

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

Alternatively, the gas heating device 200 may be a gas water heater, a wall-mounted gas stove, or the like, and the following description will be given taking the gas water heater as an example.

In an embodiment of the present invention, as shown in fig. 3 to 6, the water return valve 100 includes a valve body 10, a temperature controlled switch 30, a first check valve 20, and a second check valve 40.

As shown in fig. 3 to 6, the valve body 10 has a water path channel, the water path channel includes a first channel 11 and a second channel 12 that are arranged at an interval, and a third channel 13 and a fourth channel 14 that respectively communicate the first channel 11 with the second channel 12, and the third channel 13 is arranged at an interval with the fourth channel 14.

As shown in fig. 3 to 6, the temperature controlled switch 30 is disposed in the waterway channel, and at least a portion of the temperature controlled switch 30 is disposed in the third channel 13, so as to block the third channel 13 when the temperature of the water in the waterway channel rises to a preset temperature. Specifically, the temperature control switch 30 is a normally open switch, and is triggered to block the third flow channel 13 when the temperature of the water near the temperature sensing reaction part (hereinafter, referred to as the temperature sensing medium 323 or the temperature sensing elastic sheet) of the temperature control switch 30 rises to a preset temperature, and accordingly, when the temperature of the water near the temperature sensing reaction part of the temperature control switch 30 falls below the preset temperature, the temperature control switch 30 returns to the normally open state; that is, the temperature control switch 30 can control the on/off of the third flow channel 13 according to the change of the water temperature in the water channel. Wherein the preset temperature is determined by the trigger characteristics of the temperature controlled switch 30.

As shown in fig. 3 to 6, the first check valve 20 is at least partially disposed in the third flow channel 13, and is used for unidirectionally guiding the water in the first flow channel 11 into the second flow channel 12. Specifically, the first check valve 20 is a normally closed switch, after the first check valve 20 is opened, water in the first flow passage 11 can flow to the second flow passage 12 through the third flow passage 13, and when the first check valve 20 is closed, the first check valve 20 is configured to prevent the water in the second flow passage 12 from flowing to the first flow passage 11 through the third flow passage 13, that is, block the third flow passage 13.

As shown in fig. 3 to 6, the second check valve 40 is at least partially disposed in the fourth flow channel 14, and is used for guiding the water in the first flow channel 11 into the second flow channel 12 in a single direction. Specifically, the second check valve 40 is a normally closed switch, after the second check valve 40 is opened, the water in the first flow passage 11 can flow to the second flow passage 12 through the fourth flow passage 14, and when the second check valve 40 is closed, the second check valve 40 is configured to prevent the water in the second flow passage 12 from flowing to the first flow passage 11 through the fourth flow passage 14, that is, block the fourth flow passage 14.

The operation of the return valve 100 will be described in detail below with reference to the structure of the different water supply system 1000.

In an embodiment of the water supply system 1000, the water supply system 1000 is not provided with the water return pipe 500; as shown in fig. 1, the first flow passage 11 is connected to the heat exchange pipe, the second flow passage 12 is connected to the cold water pipe 300, and when the outlet end 700 has a plurality of flow passages, the return valve 100 is optionally provided at the most distal outlet end 700.

Specifically, one end (e.g., end B in fig. 1) of the first flow passage 11 is communicated with the hot water inlet through a hot water pipe 400, and the other end (e.g., end a in fig. 1) of the first flow passage 11 is communicated with the hot water outlet 202 through the hot water pipe 400; one end (e.g., end C in fig. 1) of the second flow passage 12 is communicated with the cold water inlet through a cold water pipe 300, and the other end (e.g., end D in fig. 1) of the second flow passage 12 is communicated with the water inlet pipe 210 through the cold water pipe 300. Thus, a return water path may be formed among the hot water pipe 400, the first flow passage 11, the third flow passage 13 and/or the fourth flow passage 14, the second flow passage 12, the cold water pipe 300, the water inlet pipe 210, the gas heating apparatus 200, and the like, and the return valve 100 is provided in the return water path.

As shown in fig. 1, the gas heating apparatus 200 further includes a water circulating pump 800, the water circulating pump 800 is disposed in the water return waterway, and the water circulating pump 800 is configured to drive water to flow in the water return waterway. Optionally, the water circulation pump 800 is disposed between the heat exchanger of the gas heating apparatus 200 and the cold water inlet 201, so that the water circulation pump 800 can also be used for sucking cold water and/or pressurizing and delivering water, etc.

Specifically, referring to fig. 3 and 4 together, when the water supply system 1000 performs the circulation preheating by using the zero cold water function, the circulation water pump 800 pushes water in the return water channel to flow, so that the water pressure in the first channel 11 is increased, and thus the difference between the water pressure in the first channel 11 and the water pressure in the second channel 12 is increased, at this time, since the water in the hot water pipe 400 is cold water (lower than a preset temperature), the water entering the water channel of the valve body 10 is cold water, and the temperature control switch 30 is in a state of opening the third channel 13, so that the first check valve 20 is opened under the action of the pressure difference, and thus the water in the first channel 11 can flow into the second channel 12 through the third channel 13, so that the water circulates in the return water channel, and the circulation preheating of the water in the hot water pipe 400 and the like can be realized. At this time, as shown in fig. 4, the return valve 100 is in a cold circulation state.

Meanwhile, it can be understood that if the opening threshold of the first check valve 20 (i.e., the critical pressure value/pressure difference value for switching the first check valve 20 from the closed state to the open state) is greater than or equal to the opening threshold of the second check valve 40 (i.e., the critical pressure value/pressure difference value for switching the second check valve 40 from the closed state to the open state), the second check valve 40 is opened while the first check valve 20 is opened, and the water in the first flow passage 11 can also flow into the second flow passage 12 from the fourth flow passage 14, so that the water circulates in the return water passage.

If the opening threshold of the first check valve 20 is smaller than the opening threshold of the second check valve 40, the second check valve 40 is still in the closed state while the first check valve 20 is opened, and the water in the first flow passage 11 can only flow to the second flow passage 12 through the third flow passage 13.

Referring to fig. 5, when the temperature of the water in the hot water pipe 400 rises to a certain temperature but does not reach the expected preheating temperature, the temperature of the water at the temperature-sensitive reaction part of the temperature-controlled switch 30 in the water channel rises to a preset temperature, and the temperature-controlled switch 30 is triggered to block the third channel 13 (after that, the first check valve 20 is slowly closed); at this time, if the second check valve 40 is in the open state, the water in the first flow passage 11 may continue to flow from the fourth flow passage 14 to the second flow passage 12, so that the water continues to circulate in the return water path to continue the circulation preheating until the expected preheating temperature is reached. At this time, if the second check valve 40 is in the closed state (i.e. the opening threshold of the first check valve 20 is smaller than the opening threshold of the second check valve 40), the circulating water pump 800 further increases the water pressure in the first flow passage 11 to further increase the pressure difference to open the second check valve 40, so that the water in the first flow passage 11 can flow from the fourth flow passage 14 to the second flow passage 12 to continue the circulating flow of the water to continue the circulating preheating until the expected preheating temperature is reached. At this time, as shown in fig. 5, the return valve 100 is in a thermal cycle state.

It can be understood that when the cyclic preheating is completed, the circulating water pump 800 is turned off so that the water pressure in the hot water pipe 400 and the water pressure in the cold water pipe 300 gradually approach to equilibrium, and the second check valve 40 is closed.

With continued reference to fig. 6, when the outlet end 700 is hot and pressurized (i.e., pressurized to deliver hot water), there are two situations, one is hot water in the hot water pipe 400, and the other is cold water in the hot water pipe 400.

For the case that the hot water is in the hot water pipe 400, the hot water in the hot water pipe 400 flows into the waterway channel through the first channel 11, the pressure of the hot water pipe 400 and the first channel 11 is increased by pressurizing with the circulating water pump 800 to increase the water outlet amount and the water outlet speed of the hot water, the pressure difference between the first channel 11 and the second channel 12 is also increased, the hot water is in the hot water pipe 400, the hot water is in the waterway channel, and the temperature control switch 30 is in the closed state to block the third channel 13, so that the first check valve 20 can be prevented from being opened by mistake.

Because the hot water pipe 400 is filled with hot water, the water outlet end 700 can be directly opened, that is, the water outlet end 700 is also in an open state, the flow rate after pressurization water delivery is large, and because of the characteristic curve of the water pump, when the flow rate is large, the pressure difference between the water inlet and the water outlet of the circulating water pump 800 is reduced, so that the pressure difference between the first flow passage 11 and the second flow passage 12 cannot reach the opening threshold of the second check valve 40, that is, the second check valve 40 is not opened enough, and thus the second check valve 40 can be prevented from being opened by mistake. It should be noted that the second check valve 40 may be opened briefly when the pressurized hot water supply is started, but then the second check valve 40 may be closed again because the pressure difference between the water inlet and the water outlet of the circulating water pump 800 is reduced. As shown in fig. 6, the water return valve 100 is in a hot pressurized state.

In this way, when the hot water pipe 400 is filled with hot water, the first check valve 20 and the second check valve 40 can be prevented from being opened by mistake when the outlet end 700 is opened and pressurized (i.e. pressurized to supply hot water), so that the hot water in the first flow passage 11 can be prevented from flowing into the second flow passage 12, and the gas heating device 200 can be prevented from being started by mistake to perform a preheating cycle.

For the case of cold water in the hot water pipe 400, before the water outlet end 700 is opened, the circulating preheating is firstly performed, after the preheating is completed, the temperature control switch 30 is triggered to block the third flow channel 13, the first check valve 20 is in a closed state, the water outlet end 700 is in a boiled water state at this time, the flow rate of the circulating water pump 800 after pressurization is large, and due to the characteristic curve of the water pump, when the flow rate is large, the differential pressure of the water inlet and the water outlet of the circulating water pump 800 is reduced, so that the differential pressure between the first flow channel 11 and the second flow channel 12 cannot reach the opening threshold of the second check valve 40, that is, the second check valve 40 is not opened enough, and the second check valve 40 can be prevented from being opened by mistake. As shown in fig. 6, the water return valve 100 is in a hot pressurized state.

In summary, when the outlet end 700 is hot water and pressurized (i.e. pressurized hot water), the water return valve 100 can achieve the effect of preventing water leakage.

Of course, the above water return valve 100 may also be used in the water supply system 1000 having the water return pipe 500.

Specifically, in another embodiment of the water supply system 1000 according to the present invention, as shown in fig. 2, the water supply system 1000 includes a water return pipe 500, one end of the water return pipe 500 is connected to the hot water pipe 400, the other end of the water return pipe is connected to one end (e.g., end a in fig. 2) of the first flow passage 11, and the other end (e.g., end B in fig. 2) of the first flow passage 11 is blocked (e.g., by an end cap).

Wherein, the second flow passage 12 is connected to the water inlet pipe 210 or the cold water pipe 300.

Alternatively, as shown in fig. 2, the second flow passage 12 is connected to the water inlet pipe 210; specifically, one end (e.g., end C in fig. 2) of the second flow passage 12 is communicated with the cold water inlet 201 through the water inlet pipe 210, and the other end (e.g., end D in fig. 2) of the second flow passage 12 is communicated with the cold water pipe 300 through the water inlet pipe 210.

Optionally, the water return valve 100 is disposed near the gas heating apparatus 200.

And in this embodiment, when the outlet end 700 has a plurality of parts, the water return pipe 500 is connected to the farthest outlet end 700.

Thus, a return water path may be formed between the hot water pipe 400, the return pipe 500, the first flow passage 11, the third flow passage 13 and/or the fourth flow passage 14, the second flow passage 12, the inlet pipe 210, and the heat exchanger of the gas heating apparatus 200, etc.; wherein the water return valve 100 is arranged in the water return waterway.

In this embodiment, as shown in fig. 2, the gas heating apparatus 200 also includes a water circulating pump 800, and the arrangement position of the water circulating pump 800 may refer to the previous embodiment, which is not described in detail herein.

In this embodiment, the water supply system 1000 can also achieve circulation preheating and water cross-over prevention during pressurized hot water supply, and specific details thereof refer to the previous embodiment of the water supply system 1000 and need not be described herein.

Of course, other water supply modes can be provided for the water supply system 1000, and need not be described in detail herein.

As can be seen from the above description, in the water return valve 100 according to the present invention, the third flow passage 13 and the fourth flow passage 14, which are disposed at intervals in the valve body 10, are respectively communicated with the first flow passage 11 and the second flow passage 12, and the temperature control switch 30 is additionally disposed in the valve body 10, so that the on-off of the third flow passage 13 and the fourth flow passage 14 can be automatically controlled by using the temperature change and the water pressure change of the water flow in the water passage, respectively, so as to enable the water supply system 1000 to realize the zero-cold-water supply function, and also to enable the water supply system 1000 to prevent the occurrence of the situation of water leakage due to pressurization (i.e., to prevent the situation that the hot water in the hot water pipe 400 or the water return pipe 500 of the water supply system 1000 is easily flowed into the cold water pipe 300 through the water return valve 100) when the pressurized water supply is started, so as to ensure the pressurization effect.

Further, the opening threshold of the first check valve 20 is smaller than the opening threshold of the second check valve 40. In this way, the differential pressure at which the second check valve 40 is opened when the pressurized hot water is fed can be increased, and thus, water breakthrough can be further prevented.

It should be noted that, in order to further illustrate the advantages of the water return valve 100 of the present invention, the present invention further provides two basic designs of the water return valve 100, in the basic design 1 of the water return valve 100, only the third flow channel 13 is provided to communicate the first flow channel 11 and the second flow channel 12, and the temperature control switch 30 and the first check valve 20 are provided in the valve body 10 to control the passage of the third flow channel 13; however, in the basic design 1, when the temperature of the water in the hot water pipe 400 reaches a certain temperature but does not reach the expected preheating temperature during the circulation preheating, the temperature control switch 30 is triggered to block the third flow channel 13, so that the continuous preheating circulation cannot be realized, and the functions of timing cruise and heat preservation cannot be realized.

In the basic design 2 of the water return valve 100, only the third flow channel 13 is arranged to communicate the first flow channel 11 and the second flow channel 12, and a check valve with a large opening threshold is arranged in the valve body 10 to prevent water from mixing, but during circulation preheating, the flow in the circulation water channel is small, the preheating speed is low, and the preheating time is long.

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

Further, as shown in fig. 3 to 6, the temperature controlled switch 30 includes an adjusting valve core 31 and a temperature controlled driving assembly 32, the adjusting valve core 31 is movably disposed in the third flow channel 13, and the adjusting valve core 31 has an initial position for opening the third flow channel 13 and a blocking position for blocking the third flow channel 13.

The temperature control driving assembly 32 is installed in the water path channel, and the temperature control driving assembly 32 is configured to drive the regulating valve core 31 to move from the initial position to the blocking position when the water temperature in the water path channel rises to a preset temperature, so as to block the third channel 13. Specifically, during the circulation preheating, the temperature of the water near the temperature sensing reaction part of the temperature control switch 30 gradually rises along with the circulation of the water in the circulation water path, and when the temperature rises to a preset temperature, the temperature sensing reaction part is triggered to enable the temperature control driving assembly 32 to drive the regulating valve core 31 to move from the initial position to the blocking position, so as to block the third flow channel 13.

Thus, the movement of the regulating valve core 31 can be controlled by the change of the water temperature in the waterway channel, so as to control the on-off of the third channel 13.

In the embodiment, the temperature controlled switch 30 is located in many positions in the valve body 10, for example, the temperature controlled switch 30 may be located on a side of the first check valve 20 close to the second flow passage 12; or on the side of the first check valve 20 adjacent to the first flow passage 11; the waterway flow passage of the valve body 10 may also include a bypass waterway flow passage communicated with the third flow passage 13, and the temperature control switch 30 is arranged in the bypass waterway flow passage; and so on. The temperature control switch 30 is provided on the first check valve 20 on the side closer to the first flow path 11.

Further, as shown in fig. 3 to 6, the temperature controlled switch 30 is disposed on a side of the first check valve 20 close to the first flow passage 11, the temperature controlled driving assembly 32 is disposed in the first flow passage 11 and/or the third flow passage 13, and the temperature controlled driving assembly 32 is configured to drive the regulating valve core 31 to move from the initial position to the blocking position when the temperature of the water in the first flow passage 11 and/or the third flow passage 13 increases to a preset temperature.

Alternatively, it is possible to have: the temperature control driving component 32 is partially arranged in the first flow channel 11, and the other part is arranged in the third flow channel 13; that is, the temperature control switch 30 is provided in the first flow channel 11 and the third flow channel 13.

In specific embodiments, the adjusting valve core 31 may open or block the third flow channel 13 in many ways, for example, the adjusting valve core 31 may be configured to open or block the third flow channel 13 by cooperating with a valve port structure formed in the third flow channel 13, may be configured to open or block the third flow channel 13 by cooperating with a valve port structure of the thermostat 30, and may even be configured to open or block the third flow channel 13 by cooperating with the first check valve 20; and so on, as exemplified below.

In an embodiment of the water return valve 100 according to the invention, as shown in fig. 3-6, a sealing ring protrusion 131 is protruded from an inner wall surface of the third flow passage 13, the temperature control switch 30 is disposed on one side of the sealing ring protrusion 131 (e.g., the side facing the first flow passage 11), and in the initial position, the adjusting valve core 31 is disposed at an interval from the sealing ring protrusion 131 to open the third flow passage 13; in the blocking position, the regulating valve core 31 blocks the sealing ring protrusion 131 to block the third flow passage 13.

Specifically, a valve port is formed inside the sealing ring protrusion 131, and when the regulating valve core 31 is blocked by the sealing ring protrusion 131, the valve port can be closed to block the third flow channel 13; when the regulating valve core 31 is away from the sealing ring protrusion 131 (i.e. spaced apart from the sealing ring protrusion 131), the valve port is opened to open the third flow channel 13.

In this manner, opening or blocking of the third flow passage 13 can be achieved by adjusting the fitting of the valve core 31 with the seal ring projection 131.

Specifically, as shown in fig. 3 to 6, the first check valve 20 is disposed on the other side of the sealing ring protrusion 131, that is, the first check valve 20 is disposed on the side of the sealing ring protrusion 131 away from the temperature controlled switch 30. In this way, interference of the sealing ring protrusion 131 with the installation of the first check valve 20 is avoided.

In the specific embodiment, the structural forms for realizing the sealing of the sealing ring protrusion 131 by the regulating valve core 31 are many, such as: the end surface of the regulating valve core 31 facing the sealing ring protrusion 131 abuts against the end surface of the sealing ring protrusion 131 facing the regulating valve core 31, so that the regulating valve core 31 is blocked by the sealing ring protrusion 131. Alternatively, it is also possible to: when in the blocking position, one end of the regulating valve core 31 can be slidably and hermetically inserted into the inner side of the sealing ring protrusion 131; and so on.

Of course, in other embodiments, the sealing ring protrusion 131 can be disposed as a component of the temperature controlled switch 30, such as: the temperature control switch 30 further comprises a sealing sleeve, the sealing sleeve is installed in the third flow channel 13, the inner peripheral wall of the third flow channel 13 is connected with the sealing sleeve in a sealing mode, and the sealing ring protrusion 131 is formed on the inner wall surface of the sealing sleeve.

In the embodiment, the structure of the temperature control driving component 32 is various, such as a temperature bulb component having a temperature bulb formed by a temperature sensing medium 323 such as paraffin, or the temperature control driving component 32 having a temperature sensing elastic sheet, etc., and it can be understood that the temperature sensing medium 323 such as paraffin, or the temperature sensing elastic sheet, etc. is a temperature sensing reaction part. Other configurations of the temperature controlled switch 30 will be described in detail below.

In an embodiment of the water return valve 100 of the present invention, as shown in fig. 3-6, the temperature-controlled driving assembly 32 includes a driving rod 321, and the regulating valve element 31 is mounted on the driving rod 321, and the driving rod 321 is configured to extend when the temperature of the water in the waterway channel rises to a preset temperature, so as to drive the regulating valve element 31 to move from the initial position to the blocking position. Specifically, the driving rod 321 is used to extend when the temperature of the water at the temperature sensing reaction part rises to a preset temperature.

Further, as shown in fig. 3 to 6, the temperature control driving assembly 32 further includes a temperature sensing shell 322 and a temperature sensing medium 323 expanding when exposed to heat, the temperature sensing shell 322 is disposed in the water channel, the driving rod 321 is slidably mounted in the temperature sensing shell 322, the temperature sensing medium 323 is disposed in the temperature sensing shell 322, and the temperature sensing medium 323 is configured to expand when exposed to heat to extend the driving rod 321 and to contract when cooled.

Specifically, the temperature sensing medium 323 expands when the temperature of the water at the temperature sensing reaction part rises to a preset temperature, so that the driving rod 321 can be driven to slide, the driving rod 321 extends out, and when the temperature of the water at the temperature sensing reaction part drops below the preset temperature, the temperature sensing medium 323 contracts, so that the driving rod 321 can be reset along with the temperature sensing medium 323 or under the driving of other resetting pieces.

The temperature control driving assembly 32 is a thermal bulb assembly, that is, the temperature sensing shell 322 and the temperature sensing medium 323 in the temperature sensing shell 322 form a thermal bulb, and form a thermal bulb assembly with the driving rod 321.

Alternatively, as shown in fig. 3 to 6, the temperature sensing case 322 includes a first case and a second case, and the first case and the second case are assembled to form the temperature sensing case 322.

Alternatively, the temperature sensing medium 323 may be paraffin, methanol, toluene, or the like. It should be noted that the preset temperature is related to the selection of the temperature sensing medium 323, for example, when the temperature sensing medium 323 is paraffin, the preset temperature can be 37 degrees, and the like.

Further, as shown in fig. 3 to 6, the temperature controlled driving assembly 32 further includes a first elastic member 324, and the first elastic member 324 is used for making the regulating valve core 31 have a tendency of returning to the initial position. In this way, when the temperature sensing medium 323 contracts, the first elastic member 324 drives the adjustment valve body 31 to return to the initial position together with the driving rod 321, thereby improving the reliability and other performances of the return valve 100.

In an embodiment, the first elastic member 324 may be a spring, a spring plate, or a rubber band.

In this embodiment, the first elastic member 324 is a first return spring. Thus, the structure can be simplified conveniently, and the performance of the spring is more stable, thereby improving the reliability.

Specifically, as shown in fig. 3 to 6, one end of the first return spring abuts against the sealing ring protrusion 131, and the other end of the first return spring is connected to the regulating valve core 31, so that the regulating valve core 31 has a tendency to return to an initial position.

Thus, when the regulating valve core 31 moves to the blocking position, the regulating valve core 31 compresses the first return spring, so that the regulating valve core 31 has a tendency to return to the initial position; when the temperature sensing medium 323 contracts, the first return spring extends to drive the adjustment spool 31 to return to the initial position.

Alternatively, as shown in fig. 3 to 6, the first return spring is sleeved outside the regulating valve core 31, so as to not only improve the stability of the movement of the regulating valve core 31, but also reduce the space occupied by the regulating valve core 31 in the moving direction. Specifically, the outer peripheral surface of the adjustment valve body 31 is provided with a mounting-side protrusion 311, and the other end of the first return spring is connected to (e.g., abutted against) the mounting-side protrusion 311. Wherein, the installation-side protrusion 311 is optionally provided at the other end of the regulating valve core 31 (i.e. the end far away from the first check valve 20); the mounting side protrusions 311 may be provided as an annular structure, or a plurality of them may be distributed at intervals along the circumferential direction of the adjustment valve core 31.

Specifically, as shown in fig. 3 to 6, the adjusting valve core 31 is provided with a mounting hole, and the driving rod 321 is mounted in the mounting hole.

In the present embodiment, the regulating valve core 31 is substantially in the shape of a cap.

Of course, in other embodiments, the temperature sensing driving assembly may also be configured in other structural forms, for example, the temperature sensing driving assembly further includes a temperature sensing seat, and a temperature sensing elastic sheet and an elastic resetting member that are disposed on the temperature sensing seat, so that the driving rod 321 extends out by the deformation of the temperature sensing elastic sheet when the temperature rises, and the driving rod 321 retracts by the elastic resetting member; or, the temperature sensing elastic sheet can directly drive the regulating valve core 31 to move without arranging the driving rod 321 and the elastic reset piece; and so on.

Further, as shown in fig. 3 to 6, the water return valve 100 further includes a second elastic member, the temperature-controlled driving component 32 is movably disposed in the waterway flow passage, and the second elastic member is configured to make the temperature-controlled driving component 32 have a tendency to move toward the direction approaching the first check valve 20. Specifically, the temperature sensing case 322 is movably disposed in the waterway channel, and the second elastic member is used to make the temperature sensing case 322 have a tendency to move toward the first check valve 20.

The slidable direction of the adjusting valve core 31 and the movable direction of the temperature sensing shell 322 should be both directions approaching or departing from the first check valve 20.

It can be understood that the temperature-controlled driving assembly 32 formed by the temperature-sensitive medium 323 such as paraffin wax generally has the characteristic of temperature-induced delay, that is, after the temperature-controlled driving assembly 32 drives the regulating valve core 31 to move to the blocking position, the regulating valve core 31 will still be driven to move in a direction away from the initial position, which may damage the regulating valve core 31.

However, in the present invention, the temperature sensing case 322 is movably disposed in the water channel, and the second elastic member is disposed to make the temperature sensing case 322 have a tendency of moving toward the first check valve 20, so that after the adjusting valve core 31 moves to the blocking position, the temperature sensing medium 323 such as paraffin will continue to expand and the driving rod 321 continues to extend due to the temperature sensing delay of the temperature sensing medium 323 such as paraffin, and at this time, the temperature sensing case 322 can be driven to move away from the first check valve 20, and the second elastic member is compressed, thereby preventing the adjusting valve core 31 and the like, and protecting the temperature controlled switch 30.

Alternatively, as shown in fig. 3-6, the second elastic member is a second return spring 34. Specifically, one end of the second return spring 34 is connected to an inner wall surface of the water passage, and the other end is connected to the temperature sensing case 322, so that the temperature sensing case 322 tends to move toward the first check valve 20.

Optionally, as shown in fig. 3 to 6, the second return spring 34 is sleeved outside the temperature sensing shell 322, so as to not only improve the moving stability of the temperature sensing shell 322, but also reduce the space occupied by the adjusting valve element 31 in the moving direction.

Alternatively, as shown in fig. 3 to 6, an installation ring protrusion 3221 is disposed on an outer circumferential surface of the temperature sensing shell 322, and the other end of the second return spring 34 is connected to (e.g., abuts against) the installation ring protrusion 3221.

Optionally, the spring constant of the first return spring is less than the spring constant of the second return spring 34.

Further, as shown in fig. 3 to 6, the first flow channel 11 includes a first flow segment 111, one end of the first flow segment 111 is provided with a first flow channel opening 113, the other end of the first flow segment 111 is communicated with the third flow channel 13, and the extending direction of the first flow segment 111 is the same as the extending direction of the third flow channel 13; the temperature-controlled switch 30 is disposed in the first flow path 111 and the third flow path 13.

In this way, the temperature controlled switch 30 can be installed into the first flow channel 11 and the third flow channel 13 through the first flow channel port 113, so as to simplify the installation process. Furthermore, it is possible to arrange a part of the structure of the temperature controlled switch 30 in the first flow section 111 to improve space utilization in the valve body 10, so that the water return valve 100 can be designed in a compact size.

Further, as shown in fig. 3 to 6, the water return valve 100 further includes an external joint 70, the external joint 70 is detachably installed at the first flow passage 113, the second return spring 34 is sleeved outside the temperature sensing shell 322, and one end of the second return spring 34 abuts against the external joint 70, and the other end is connected to the temperature sensing shell 322, so that the temperature sensing shell 322 has a tendency to move toward the direction of the one-way valve. Furthermore, the temperature-controlled drive assembly 32 can be movably mounted in the waterway flow passage by the action of the first and second return springs 34.

Optionally, the outer joint 70 is a threaded joint.

Further, as shown in fig. 3 to 6, in order to improve the mounting and moving stability of the temperature controlled driving assembly 32, the temperature controlled switch 30 further includes a supporting frame 35, the supporting frame 35 is fixedly mounted in the third flow channel 13, and the temperature controlled driving assembly 32 is mounted on the supporting frame 35.

Specifically, the supporting frame 35 is provided with a supporting hole, and the temperature sensing shell 322 is slidably mounted in the supporting hole, so that the temperature control driving component 32 is movably mounted in the water channel.

Further, as shown in fig. 3 to 6, the second flow channel 12 includes a second flow segment 121, one end of the second flow segment 121 is provided with a second flow channel opening 123, the other end of the second flow segment 121 is communicated with the third flow channel 13, and the extending direction of the second flow segment 121 is the same as the extending direction of the third flow channel 13. In this way, the check valve can be installed into the third flow channel 13 and/or the second flow section 121 through the second flow channel opening 123.

Optionally, as shown in fig. 3 to 6, the first flow segment 111, the third flow channel 13, and the second flow segment 121 are straight flow channels, and the first flow segment 111 and the second flow segment 121 are respectively disposed at two ends of the third flow channel 13.

Optionally, as shown in fig. 3 to 6, the water return valve 100 further includes a water quantity adjusting core 60, and the water quantity adjusting core 60 is disposed in the second flow section 121 and abuts against the first check valve 20; in this way, on the one hand, the first non-return valve 20 can be fixed in the valve body 10 and, on the other hand, the water flow rate of the second flow channel 12 can also be regulated.

Further, as shown in fig. 3 to 6, the first check valve 20 includes a first valve core 21, a first elastic restoring member 23, and a first valve housing 22 with both ends open.

Wherein the first valve housing 22 is sealingly mounted in the third flow channel 13 and/or the second flow section 121, and the first valve housing 22 is retained at the sealing ring protrusion 131.

Wherein the first valve spool 21 is movably provided in the first valve housing 22 to open or close the first check valve 20. Specifically, an opening annular protrusion is provided on an inner wall surface of the first valve housing 22, and the first check valve 20 is opened or closed by the first valve body 21 being fitted to the opening annular protrusion.

Further, as shown in fig. 3 to 6, the first flow channel 11 further includes a third flow segment 112 communicated with the first flow segment 111, a communication position between the first flow segment 111 and the third flow segment 112 is communicated with the third flow channel 13, and one end of the third flow segment 112 is provided with a third flow channel opening 114.

The second flow channel 12 further comprises a fourth flow section 122 communicated with the second flow section 121, the communication position of the second flow section 121 and the fourth flow section 122 is communicated with the third flow channel 13, and a fourth flow channel opening 124 is arranged at one end of the fourth flow section 122.

Specifically, as shown in fig. 3 to 6, the fourth flow channel 14 communicates the second flow section 121 and the fourth flow section 122.

Further, as shown in fig. 3 to 6, the second check valve 40 includes a second valve core 41, a second elastic restoring member 42 and a plug 43, and the second valve core 41 is movably disposed in the fourth flow passage 14 to open or block the fourth flow passage 14.

The valve body 10 is provided with a mounting opening 15 corresponding to the flow passage opening of the fourth flow passage 14, the plug 43 is detachably mounted in the mounting opening 15, and the second elastic reset member 42 is disposed between the second valve core 41 and the plug 43, so that the second valve core 41 has a tendency to reset to a position blocking the fourth flow passage 14.

In this way, the second valve body 41 is directly engaged with the fourth flow channel 14 to control the on/off of the fourth flow channel 14, thereby simplifying the structure of the return valve 100.

Further, as shown in fig. 3 to 6, an adjusting groove 141 is provided at a flow passage of the fourth flow passage 14, the second valve element 41 is movably disposed in the adjusting groove 141, and the second valve element 41 abuts against a bottom of the adjusting groove 141 to block the fourth flow passage 14. Thus, the structure of the return valve 100 can be further simplified.

Further, as shown in fig. 3 to 6, the position of the plug 43 in the movable direction of the second spool 41 is adjustable. In this way, the opening threshold of the second check valve 40 can be adjusted, so that the opening threshold of the second check valve 40 can be adjusted according to requirements.

Specifically, the opening threshold (i.e., the hydraulic opening pressure) of the second check valve 40 may be made greater than or equal to 0.08 megapascals (MPa) and less than or equal to 0.13 megapascals (MPa). For example, when the plug 43 is moved to a position closest to the fourth flow passage 14, the opening threshold of the second check valve 40 may be selected to be 0.13 megapascals (MPa).

Specifically, the plug 43 is screwed to the mounting opening 15, so that the position of the plug 43 in the movable direction of the second valve spool 41 is adjustable.

Further, as shown in fig. 3 to 6, the elastic coefficient of the elastic restoring member (i.e. the first elastic restoring member 23) of the first check valve 20 is smaller than the elastic coefficient of the elastic restoring member (i.e. the second elastic restoring member 42) of the second check valve 40, so as to make the opening threshold of the first check valve 20 smaller than the opening threshold of the second check valve 40.

Of course, in other embodiments, the second one-way valve 40 may be provided in other structures, such as a second valve casing, which is hermetically installed in the fourth flow passage 14 and in which the second valve spool 41 is movably disposed; and so on.

Certainly, in the specific embodiment, there are various ways for designing the water flow passage in the valve body 10, for example, the first flow passage 11, the second flow passage 12, the third flow passage 13, and the fourth flow passage 14 are all straight flow passages, and the third flow passage 13 and the fourth flow passage 14 are both disposed between the first flow passage 11 and the second flow passage 12 and respectively communicate with the first flow passage 11 and the second flow passage 12; and so on.

The above description is only an alternative embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the present invention, which are made by the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.

Claims (18)

1. A water return valve, comprising:

the valve body is provided with a waterway flow passage, the waterway flow passage comprises a first flow passage and a second flow passage which are arranged at intervals, and a third flow passage and a fourth flow passage which are respectively communicated with the first flow passage and the second flow passage, and the third flow passage and the fourth flow passage are arranged at intervals;

the temperature control switch is arranged in the waterway flow passage, and at least part of the temperature control switch is arranged in the third flow passage so as to be used for blocking the third flow passage when the temperature of water in the waterway flow passage rises to a preset temperature;

the first one-way valve is at least partially arranged in the third flow channel and used for guiding the water in the first flow channel into the second flow channel in a one-way mode; and

and at least part of the second one-way valve is arranged in the fourth flow channel and is used for guiding the water in the first flow channel into the second flow channel in a one-way mode.

2. The water return valve according to claim 1, wherein the temperature-controlled switch includes an adjusting spool and a temperature-controlled driving member, the adjusting spool is movably disposed in the third flow passage, and the adjusting spool has an initial position for opening the third flow passage and a blocking position for blocking the third flow passage;

the temperature control driving assembly is installed in the waterway runner and used for driving the adjusting valve core to move from the initial position to the blocking position when the water temperature in the waterway runner rises to the preset temperature so as to block the third runner.

3. The water return valve according to claim 2, wherein a sealing ring protrusion is protruded from an inner wall surface of the third flow passage, the temperature control switch is provided on a side of the sealing ring protrusion, and the adjustment valve core is spaced apart from the sealing ring protrusion at the initial position to open the third flow passage; and when the valve core is at the blocking position, the adjusting valve core blocks the convex sealing ring to block the third flow passage.

4. The water return valve according to claim 3, wherein, in the blocking position, an end surface of the regulating valve element that faces the sealing ring protrusion abuts against an end surface of the sealing ring protrusion that faces the regulating valve element, so that the regulating valve element is blocked by the sealing ring protrusion; alternatively, the first and second electrodes may be,

when the valve plug is in the blocking position, one end of the adjusting valve core can be slidably and hermetically inserted into the inner side of the sealing ring boss.

5. The water return valve according to claim 2 wherein said thermostatic drive assembly includes a drive rod, said regulating valve cartridge being mounted to said drive rod, said drive rod being adapted to extend when the temperature of the water in said waterway channel rises to said predetermined temperature to drive said regulating valve cartridge from said initial position to said blocking position.

6. The water return valve according to claim 5 wherein said temperature-controlled driving assembly further comprises a temperature-sensing housing and a temperature-sensing medium that expands when exposed to heat, said temperature-sensing housing being disposed within said waterway, said driving rod being slidably mounted within said temperature-sensing housing, said temperature-sensing medium being disposed within said temperature-sensing housing, said temperature-sensing medium being adapted to expand when exposed to heat and thereby extend said driving rod, and to contract when cooled.

7. The water return valve according to claim 6 wherein said thermostatic drive assembly further comprises a first resilient member for providing said adjustment spool with a tendency to return to said initial position.

8. The water return valve according to claim 7, further comprising a second elastic member, wherein the temperature sensing case is movably disposed in the waterway channel, and the second elastic member is adapted to cause the temperature sensing case to have a tendency to move in a direction approaching the first check valve.

9. The water return valve according to claim 8, wherein the first flow path comprises a first flow section, one end of the first flow section is provided with a first flow path opening, the other end of the first flow section is communicated with the third flow path, and the extending direction of the first flow section is the same as the extending direction of the third flow path; the temperature control switch is arranged in the first flow section and the third flow channel.

10. The water return valve according to claim 9 further comprising an external joint, wherein the external joint is detachably mounted at the first flow passage opening, the second elastic member is a second return spring, the second return spring is sleeved outside the temperature sensing housing, and one end of the second return spring abuts against the external joint and the other end of the second return spring is connected to the temperature sensing housing, so that the temperature sensing housing has a tendency to move toward the one-way valve.

11. The water return valve according to claim 3, wherein said first check valve is disposed on a side of said sealing ring protruding away from said temperature control switch.

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

13. The water return valve according to any one of claims 1 to 11 wherein the second one-way valve comprises a second spool, a second elastic return member and a plug, the second spool being movably disposed in the fourth flow passage for opening or blocking the fourth flow passage;

the valve body is provided with a mounting opening corresponding to the flow passage opening of the fourth flow passage, the plug is detachably mounted in the mounting opening, and the second elastic reset piece is arranged between the second valve core and the plug, so that the second valve core has the tendency of resetting to the position where the fourth flow passage is blocked.

14. The water return valve according to claim 13, wherein an adjusting groove is provided at a flow passage opening of the fourth flow passage, the second spool is movably provided in the adjusting groove, and the second spool abuts against a bottom of the adjusting groove to block the fourth flow passage.

15. The water return valve according to claim 13 wherein the position of said plug in the movable direction of said second spool is adjustable.

16. A water supply system, comprising:

a gas heating device;

the water outlet end is connected with the gas water heater through a cold water pipe, a hot water pipe and a water mixing device; and

a water return valve according to any one of claims 1 to 15 having a first flow path connected to the hot water pipe and a second flow path connected to the cold water pipe.

17. The water supply system of claim 16 wherein the gas-fired heating device is a gas water heater or a gas wall-mounted stove.

18. A water supply system, comprising:

a gas heating device;

the water outlet end is connected with the gas water heater through a cold water pipe, a hot water pipe and a water mixing device;

the water return valve according to any one of claims 1 to 15, wherein a second flow passage of the water return valve is connected to a cold water pipe or a water inlet pipe of the gas heating device; and

and one end of the water return pipe is connected to the hot water pipe, and the other end of the water return pipe is connected to the first flow channel of the water return valve.

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