Three-way valve and water heater circulation system

Abstract

The application discloses a three-way valve and a water heater circulating system. The three-way valve comprises an outer shell, a water inlet cavity, a water return cavity and a water using cavity in the outer shell; a starting assembly arranged in the water using cavity; and a flow assembly arranged in the water inlet cavity and the water return cavity. The flow assembly has a water return state or a water using state under the driving action of the starting assembly. When the flow assembly is in the water using state, the water using cavity is communicated with the water inlet cavity and is isolated from the water return cavity, forming a water using flow from the water inlet cavity to the water using cavity. When the flow assembly is in the water return state, the water return cavity is communicated with the water inlet cavity through the flow assembly, forming a water return flow from the water return cavity to the water inlet cavity. The starting assembly and the flow assembly are arranged in the outer shell. The starting assembly is used for driving the flow assembly to work, so that the flow assembly enters the water using state, the water using flow from the water inlet cavity to the water using cavity is formed, the water in the water return cavity is prevented from flowing into a water using device, and the situation that the gas water heater is started is avoided.

Description

Technical Field

[0001] This invention relates to the technical field of water heaters, and particularly to a three-way valve and a water heater circulation system. Background Technology

[0002] Because zero-cold-water gas water heaters use the cold water pipe as a return pipe, a connecting valve (one-way valve) is needed to connect the cold water pipe and the hot water pipe to form a circulation loop. When cold water is used at the water outlet, some of the cold water will pass through the gas water heater to the cold water outlet. Especially when the water usage is high, this will trigger the start-up of most gas water heaters on the market. Therefore, when water is flushed, the gas water heater will ignite and burn, resulting in wasted gas, shortened water heater lifespan, and a poor user experience. Summary of the Invention

[0003] The purpose of this invention is to provide a three-way valve and a water heater circulation system, which aims to solve the technical problem of accidental activation of the gas water heater by water usage at the water point in the prior art.

[0004] To achieve the above objectives, the technical solutions of the present invention are as follows:

[0005] The present invention provides a three-way valve, comprising: an outer shell having an inlet chamber, a return chamber, and a water-using chamber inside; an activation component disposed in the water-using chamber; and a flow component disposed in the inlet chamber and the return chamber; wherein the flow component has a return water state or a water-using state under the driving action of the activation component;

[0006] When the flow component is in a water-using state, the water-using chamber is connected to the water-inlet chamber and isolated from the water-return chamber, forming a water flow from the water-inlet chamber to the water-using chamber;

[0007] When the flow component is in the return water state, the return water chamber is connected to the inlet water chamber through the flow component, forming a return water flow from the return water chamber to the inlet water chamber.

[0008] Compared with the prior art, the outer casing of the present invention is provided with a starting component and a flow component. The starting component drives the flow component to work so that the flow component enters the water use state, forming a water flow from the water inlet chamber to the water use chamber, preventing water in the return chamber from flowing into the water heater and avoiding the occurrence of triggering the gas water heater to start.

[0009] In one embodiment, the circulation component includes:

[0010] The flow pipe has its mounting part sealed to the inner wall of the return water chamber, thus isolating the return water chamber from the inlet water chamber; the flow pipe includes a cavity, the first opening of the cavity is connected to the return water chamber, and the second opening of the cavity is connected to the inlet water chamber;

[0011] A flow-blocking plate is disposed at the second opening and is used to close the second opening under the driving action of the starting component or to open the second opening under the action of the return water flow.

[0012] In one embodiment, a movable member is provided inside the cavity, the middle end of the movable member is rotatably connected to the inner wall of the cavity, the first end of the movable member is drivenly connected to the starting component, and the second end of the movable member is provided with a locking part for locking with the flow-blocking plate; wherein, the second end is also connected to the cavity through a first elastic member.

[0013] In one embodiment, the startup component includes:

[0014] A frame that is connected to the inner wall of the water cavity;

[0015] A trigger element moves up and down within the frame under the action of water flow. The upper end of the trigger element is connected to the first end of the movable element, and the lower end of the trigger element has a triggering part.

[0016] In one embodiment, the flow component is also in a water-flowing state under the driving action of the starting component of another three-way valve; when the flow component is in a second water-use state, the water inlet chamber is connected to the water return chamber through the flow component to form a water flow from the water inlet chamber to the water return chamber.

[0017] In one embodiment, the flow pipe further includes a return cavity, which is connected to the pipe cavity through the first opening and is also connected to the inlet cavity through a slot on the flow pipe. The flow assembly further includes a sealing member disposed in the return cavity to seal the slot and isolate the inlet cavity from the return cavity. Under the action of water flow, the sealing member moves along the length of the return cavity, thereby connecting the inlet cavity and the return cavity.

[0018] In one embodiment, the sealing member has a water passage at its center, which corresponds to the first opening; the sealing member has a sealing part at its periphery, which corresponds to the slot.

[0019] In one embodiment, the flow assembly further includes a limiting member and a second elastic member, the limiting member being connected and fixed to the inner wall of the reflux cavity; the second elastic member is constrained between the blocking member and the limiting member.

[0020] In one embodiment, the flow-blocking plate is rotatably connected to the flow tube via a torsion spring.

[0021] The present invention also provides a water heater circulation system, which includes a three-way valve as described above, and further includes a water heater and a water user; the return water chamber of the three-way valve is connected to the water heater, the water usage chamber of the three-way valve is connected to the water user, and the inlet water chamber of the three-way valve is connected to an external water circuit and the water heater.

[0022] To better understand and implement this invention, the following detailed description is provided in conjunction with the accompanying drawings. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of one of the water heater circulation systems of this application;

[0024] Figure 2 This is another schematic diagram of the water heater circulation system of this application;

[0025] Figure 3 This is a schematic diagram of the normal state of the three-way valve of this application;

[0026] Figure 4 This is a schematic diagram of the water usage state of the three-way valve of this application;

[0027] Figure 5 This is a schematic diagram of the return water state of the three-way valve of this application;

[0028] Figure 6 This is a schematic diagram of the three-way valve of this application in the same water state;

[0029] Figure 7 This is a cross-sectional view of the three-way valve of this application.

[0030] Figure label:

[0031] 1—Three-way valve, 10—Outer shell, 10a—Inlet chamber, 10b—Return chamber, 10c—Use chamber, 2—Use water appliance, 20—Starting assembly, 210—Frame, 220—Trigger element, 221—Trigger part, 222—Connector, 3—Water heater, 30—Flow assembly, 310—Flow pipe, 311—Installation part, 312—Cavity, 3121—First opening, 3122—Second opening, 320—Blocking plate, 321—Matching part, 3211—Slot, 330—Moving part, 331—Locking part, 332—First elastic element, 340—Return chamber, 341—Gate, 350—Blocking element, 351—Water passage, 352—Blocking part, 360—Limiting element, 370—Second elastic element. Detailed Implementation

[0032] To better illustrate the present invention, the invention will now be described in further detail with reference to the accompanying drawings.

[0033] It should be understood that the described embodiments are merely some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of the embodiments of this application.

[0034] The terminology used in the embodiments of this application is for the purpose of describing particular embodiments only and is not intended to limit the embodiments of this application. The singular forms “a,” “the,” and “the” used in the embodiments of this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0035] In the following description, when referring to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims. In the description of this application, it should be understood that the terms "first," "second," "third," etc., are used only to distinguish similar objects and are not necessarily used to describe a specific order or sequence, nor should they be construed as indicating or implying relative importance. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0036] Furthermore, in the description of this application, unless otherwise stated, "multiple" means two or more. "And / or" describes the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A alone, A and B simultaneously, or B alone. The character " / " generally indicates that the preceding and following related objects have an "or" relationship.

[0037] Combination Figures 1 to 7As shown, the three-way valve 1 of the present invention can be used in conjunction with a water heater 3 and a water appliance 2 (such as a toilet, washbasin, etc.). The return water chamber 10b of the three-way valve 1 is connected to the water heater 3, the water chamber 10c of the three-way valve 1 is connected to the water appliance 2, and the inlet water chamber 10a of the three-way valve 1 is connected to an external water circuit and the water heater 3, forming a water heater circulation system. The hot water output from the water heater 3 flows back to the water heater 3 through the three-way valve 1, supplying water to the cold water end of the water heater 3, thus providing a basis for realizing the zero cold water function of the water heater 3. Moreover, the water chamber 10c of the three-way valve 1 is connected to the water appliance 2. When the water appliance 2 uses water, the water in the inlet water chamber 10a flows directly into the water appliance 2 through the water chamber 10c, while the water in the return water chamber 10b does not flow into the water appliance 2, avoiding the triggering of the gas water heater 3.

[0038] It should be noted that, for the sake of understanding this technical solution, the following description of the water appliance 2 will use a flush toilet as a specific embodiment.

[0039] The present invention provides a three-way valve 1, comprising: an outer shell 10 having an inlet chamber 10a, a return chamber 10b, and a water-using chamber 10c; an activation component 20 disposed in the water-using chamber 10c; and a flow component 30 disposed in the inlet chamber 10a and the return chamber 10b; the flow component 30 having a return water state or a water-using state under the driving action of the activation component 20.

[0040] When the flow component 30 is in the water-use state, the water-use chamber 10c is connected to the water inlet chamber 10a and isolated from the water return chamber 10b, forming a water flow from the water inlet chamber 10a to the water-use chamber 10c. Specifically, when a user flushes the toilet, the starting component 20 is triggered during the flushing process. The starting component 20 drives the flow component 30 into the water-use state. At this time, the water inlet chamber 10a and the water-use chamber 10c are connected, forming a water flow from the water inlet chamber 10a to the water-use chamber 10c. Tap water from the external water supply will flow to the toilet along the direction of the water flow. Since the water-use chamber 10c is isolated from the water return chamber 10b, the hot water from the water heater 3 will not flow to the toilet, thus preventing the water heater 3 from being triggered when the toilet uses a large amount of water.

[0041] When the flow component 30 is in the return water state, the return water chamber 10b is connected to the inlet water chamber 10a through the flow component 30, forming a return water flow from the return water chamber 10b to the inlet water chamber 10a. Specifically, when the user uses the water heater 3, during the use of the water heater 3, some hot water from the hot water end needs to flow back to the cold water end of the water heater 3 through the three-way valve 1. The direction of the water flow is consistent with the direction of the return water flow. The flow component 30 enters the return water state. At this time, the return water chamber 10b is connected to the inlet water chamber 10a through the flow component 30, forming a return water flow from the return water chamber 10b to the inlet water chamber 10a. Combined with the tap water from the external water circuit, water is supplied to the cold water end of the water heater 3 to achieve the zero cold water function.

[0042] It should be noted that the flow component 30 also has a normal state. In the normal state, the return water chamber 10b is isolated from the inlet water chamber 10a and the water chamber 10c. The water in the return water chamber 10b comes from the hot water end of the water heater 3, and the water in the inlet water chamber 10a and the water chamber 10c comes from the external water circuit, thus avoiding the phenomenon of water flow cross-flow due to the interconnection of the chambers.

[0043] Compared with the prior art, the outer casing 10 of the present invention is provided with a starting component 20 and a flow component 30. The starting component 20 drives the flow component 30 to work so that the flow component 30 enters the water use state, forming a water flow from the water inlet chamber 10a to the water use chamber 10c, preventing water in the return chamber 10b from flowing into the water heater 2, and avoiding the situation of triggering the gas water heater 3 to start.

[0044] In one embodiment, the flow assembly 30 includes: a flow pipe 310, the mounting portion 311 of which is sealed to the inner wall of the return water chamber 10b, thereby isolating the return water chamber 10b from the inlet water chamber 10a; the flow pipe 310 includes a cavity 312, the first opening 3121 of the cavity 312 communicating with the return water chamber 10b, and the second opening 3122 of the cavity 312 communicating with the inlet water chamber 10a; and a flow baffle 320 disposed at the second opening 3122, used to close the second opening 3122 under the driving action of the starting assembly 20 or to open the second opening 3122 under the action of the return water flow.

[0045] In this embodiment, the flow pipe 310 is installed into the outer casing 10, and the mounting part 311 is sealed to the inner wall of the return water chamber 10b, isolating the return water chamber 10b from the inlet water chamber 10a. This ensures that the return water chamber 10b and the inlet water chamber 10a can only communicate through a specific channel of the flow pipe 310. It should be noted that the specific channel mentioned above includes a lumen 312, the first opening 3121 of the lumen 312 is connected to the return water chamber 10b, and the second opening 3122 of the lumen 312 is connected to the inlet water chamber 10a.

[0046] Specifically, when the flow component 30 is in the water-using state, the flow-blocking plate 320 closes the second opening 3122 under the driving action of the starting component 20, so that the return water chamber 10b is isolated from the inlet water chamber 10a. At this time, the water-using chamber 10c is connected to the inlet water chamber 10a, forming a water flow from the inlet water chamber 10a to the water-using chamber 10c. The toilet is supplied with tap water from the external water circuit, and the hot water from the water heater 3 will not flow to the toilet, avoiding the water heater 3 from being triggered when the toilet uses a large amount of water. When the flow component 30 is in the return water state, the flow-blocking plate 320 is opened under the action of the return water flow, so that the second opening 3122 is opened. The return water chamber 10b is connected to the inlet water chamber 10a through the pipe 312, and the cold water of the water heater 3 is supplied with tap water from the external water circuit, realizing the zero cold water function.

[0047] Preferably, a movable member 330 is provided inside the cavity 312. The middle end of the movable member 330 is rotatably connected to the inner wall of the cavity 312, ensuring that the movable member 330 can rotate within the cavity 312. The specific method for controlling the rotation of the movable member 330 is as follows: the first end of the movable member 330 is drivenly connected to the starting component 20, and the second end of the movable member 330 is provided with a locking part 331 for locking with the flow-blocking plate 320. The starting component 20 drives the first end of the movable member 330 to move downward, causing the second end of the movable member 330 to move upward, and causing the locking part 331 to lock with the matching part 321 of the flow-blocking plate 320, thereby locking the flow-blocking plate 320 and achieving the purpose of closing the second opening 3122. The second end is also connected to the cavity 312 via a first elastic element 332, so that when the movable element 330 loses the drive of the starting component 20, it can be reset by the pulling force of the first elastic element 332, releasing the lock on the flow-blocking plate 320, so that the flow-blocking plate 320 can be opened under the action of the return water flow.

[0048] It should be noted that the flow-blocking plate 320 has a first surface and a second surface. When the flow-blocking plate 320 closes the second opening 3122, the second surface faces the pipe cavity 312, and the first surface faces the water inlet cavity 10a. The matching part 321 is disposed on the second surface. Further, the locking part 331 is an upwardly protruding latch, and the matching part 321 has a latch groove 3211 corresponding to the latch. By inserting the latch into the latch groove 3211, the locking part 331 and the matching part 321 of the flow-blocking plate 320 are locked together.

[0049] Preferably, the flow-blocking plate 320 is rotatably connected to the flow pipe 310 via a torsion spring, so that the flow-blocking plate 320 can close the second opening 3122 when the flow assembly 30 is in the normal state, thereby isolating the return water chamber 10b from the inlet water chamber 10a and the water chamber 10c, preventing water flow from crossing the chambers; and it also allows the locking part 331 on the movable part 330 to lock into the matching part 321 of the flow-blocking plate 320 after rotation, without the need for alignment, so that the three-way valve 1 has high stability during operation.

[0050] In one embodiment, the mounting portion 311 is an outwardly protruding part of the flow tube 310, and a corresponding groove is formed on the inner wall of the outer casing 10. By inserting the mounting portion 311 into the groove, the flow assembly 30 can be installed and positioned in the outer casing 10. Preferably, the mounting portion 311 can be made of a relatively variable material, such as rubber or silicone.

[0051] In one embodiment, the activation component 20 includes: a frame 210 connected to the inner wall of the water chamber 10c; a trigger 220 that moves up and down within the frame 210 under the action of water flow, the upper end of the trigger 220 being connected to the first end of the movable component 330, and the lower end of the trigger 220 having a trigger portion 221. Specifically, in this embodiment, the frame 210 is connected to the inner wall of the water chamber 10c, thereby fixing the relative position of the frame 210 in the water chamber 10c. The frame 210 has slots at both its upper and lower parts, allowing water in the water chamber 10c to flow from the water chamber 10c to the toilet via these slots. The trigger 220 is disposed within the frame 210. The upper end of the trigger 220 is connected to the first end of the movable member 330, and the lower end of the trigger 220 has a trigger part 221. When the user flushes the toilet, the water flow causes the trigger part 221 to move downwards, thereby causing the trigger 220 to move downwards and pulling the movable member 330 to rotate, thus locking the flow-blocking plate 320 in place by the locking part 331.

[0052] Furthermore, the trigger part 221 is an outwardly extending force-bearing plate. When the toilet is flushed, the water flow above the force-bearing plate flows downward, generating a downward force on the force-bearing plate, thereby causing the trigger 220 to move downward. Moreover, the force-bearing plate also abuts against the lower part of the frame 210, using the frame 210 to limit the movement of the trigger 220. Preferably, the force-bearing plate has an upwardly protruding extension block on its periphery. This extension block increases the volume of water above the force-bearing plate per unit time, making it easier for the trigger 220 to move downward.

[0053] Furthermore, the upper end of the trigger member 220 has a trigger rod, and the upper part of the frame 210 is provided with a through groove corresponding to the trigger rod. After the trigger rod passes through the through groove, it is connected to the first end of the movable member 330 through the connector 222. In this embodiment, the upper part of the frame 210 is used to limit the trigger member 220 to prevent the trigger member 220 from detaching from the frame 210.

[0054] Preferably, the connector 222 has a spring, which can buffer the downward force of the trigger 220 to prevent the connector 222 from breaking.

[0055] Normally, a water heater circulation system is equipped with multiple water heaters 2, and there may be a situation where one water heater 2 corresponds to one three-way valve 1, that is, the water heater circulation system is equipped with multiple three-way valves 1. In order to enable the three-way valve 1 of the present invention to work normally in a circulation system with multiple three-way valves 1, in one embodiment, the flow component 30 is also in a water-flowing state under the driving action of the starting component 20 of another three-way valve 1; when the flow component 30 is in the second water-use state, the inlet chamber 10a is connected to the return chamber 10b through the flow component 30, forming a water flow from the inlet chamber 10a to the return chamber 10b.

[0056] To facilitate understanding of this technology, the following description will use three-way valve 1A, three-way valve 1B, etc. Specifically, when the toilet corresponding to three-way valve 1A uses water, the flow component 30 of three-way valve 1B, which is connected to the inlet chamber 10a of three-way valve 1A, will enter the water flow state. A water flow from the inlet chamber 10a to the return chamber 10b is formed in three-way valve 1B to deliver water to three-way valve 1A and provide sufficient water volume for flushing.

[0057] In one embodiment, the flow pipe 310 further includes a return cavity 340, which is connected to the pipe cavity 312 through the first opening 3121. The return cavity 340 is also connected to the water inlet cavity 10a through a slot 341 on the flow pipe 310. The flow assembly 30 further includes a sealing member 350, which is disposed in the return cavity 340 to seal the slot 341, thereby isolating the water inlet cavity 10a from the return cavity 340. Under the action of water flow, the sealing member 350 moves along the length of the return cavity 340, thereby connecting the water inlet cavity 10a with the return cavity 340.

[0058] In this embodiment, under normal conditions, the sealing member 350 blocks the slot 341, isolating the water inlet chamber 10a from the return chamber 340. Water in the water inlet chamber 10a cannot flow into the return chamber 340 through the slot 341. When the toilet of the three-way valve 1A is flushed, water flow is generated in the three-way valve 1B. The water flow acts on the sealing member 350 through the slot 341, causing the sealing member 350 to move along the length of the return chamber 340 towards the three-way valve 1A, so that the water inlet chamber 10a and the return chamber 340 are connected, providing sufficient water for the three-way valve 1A to flush.

[0059] Furthermore, the sealing member 350 has a water passage 351 at its center, which corresponds to the first opening 3121; the sealing member 350 has a sealing part 352 on its periphery, which corresponds to the slot 341. The water flow from the return water chamber 10b and the return flow chamber 340 can flow into the pipe cavity 312 through the water passage 351, so that the three-way valve 1 does not affect the water supply in the return water state. The sealing part 352 is located on the periphery, corresponding to the slot 341, in order to seal the slot 341.

[0060] Furthermore, the flow assembly 30 also includes a limiting member 360 and a second elastic member 370. The limiting member 360 is connected and fixed to the inner wall of the return cavity 340; the second elastic member 370 is constrained between the blocking member 350 and the limiting member 360. In this embodiment, the limiting member 360 is used to limit the movement distance of the blocking member 350, and the elastic force of the second elastic member 370 is used to reset the blocking member 350, so that the blocking member 350 blocks the slot 341 in the normal state.

[0061] The present invention also provides a water heater circulation system, which includes a three-way valve 1 as described above, a water heater 3 and a water user 2; the return water chamber 10b of the three-way valve 1 is connected to the water heater 3, the water chamber 10c of the three-way valve 1 is connected to the water user 2, and the inlet water chamber 10a of the three-way valve 1 is connected to an external water circuit and the water heater 3.

[0062] Based on the disclosure and teachings of the foregoing specification, those skilled in the art can make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the protection scope of the claims of the present invention. Furthermore, although some specific terms are used in this specification, these terms are only for convenience of explanation and do not constitute any limitation on the present invention.

Claims

1. A three-way valve, characterized in that, include: The outer shell has an inlet chamber, a return chamber, and a water-using chamber inside. A start-up component is disposed within the water chamber; The starting component includes: a frame that is connected to the inner wall of the water chamber; A trigger element moves up and down within the frame under the action of water flow. The upper end of the trigger element is connected to the first end of the movable element, and the lower end of the trigger element has a triggering part. A flow assembly is disposed in the inlet chamber and the return chamber. The flow assembly includes: a flow pipe, the mounting part of which is sealed to the inner wall of the return chamber, thereby isolating the return chamber from the inlet chamber; the flow pipe includes a cavity, the first opening of which communicates with the return chamber, and the second opening of which communicates with the inlet chamber; a flow-blocking plate disposed at the second opening, used to close the second opening under the driving action of the starting assembly or to open the second opening under the action of the return water flow; a movable member is provided inside the cavity, the middle end of which is rotatably connected to the inner wall of the cavity, the first end of which is driven to the starting assembly, and the second end of which is provided with a locking part for locking with the flow-blocking plate; wherein, the second end is also connected to the cavity through a first elastic member. The circulation component has a water return state or a water usage state under the driving action of the starting component; When the flow component is in a water-using state, the water-using chamber is connected to the water-inlet chamber and isolated from the water-return chamber, forming a water flow from the water-inlet chamber to the water-using chamber; When the flow component is in the return water state, the return water chamber is connected to the inlet water chamber through the flow component, forming a return water flow from the return water chamber to the inlet water chamber.

2. The three-way valve according to claim 1, characterized in that: The flow component also has a water-flow state under the driving action of the actuation component of another three-way valve; When the flow component is in the second water usage state, the water inlet chamber is connected to the water return chamber through the flow component, forming a water flow from the water inlet chamber to the water return chamber.

3. The three-way valve according to claim 2, characterized in that: The flow pipe also includes a return cavity, which is connected to the pipe cavity through the first opening, and the return cavity is also connected to the water inlet cavity through a groove on the flow pipe; The flow assembly also includes a sealing element disposed in the return cavity to seal the slot and isolate the inlet cavity from the return cavity; Under the action of the flowing water, the sealing component moves along the length of the return cavity, making the inlet cavity and the return cavity connected.

4. The three-way valve according to claim 3, characterized in that: The sealing component has a water passage in the middle, and the water passage is provided corresponding to the first opening; The sealing component has a sealing part on its peripheral side, and the sealing part is provided corresponding to the slot.

5. The three-way valve according to claim 3, characterized in that: The flow assembly further includes a limiting member and a second elastic member, wherein the limiting member is connected and fixed to the inner wall of the reflux cavity; The second elastic element is constrained between the sealing element and the limiting element.

6. The three-way valve according to claim 1, characterized in that: The flow-blocking plate is rotatably connected to the flow tube via a torsion spring.

7. A water heater circulation system, characterized in that, The three-way valve includes any one of claims 1-6, and further includes a water heater and a water-using appliance; the return water chamber of the three-way valve is connected to the water heater, the water-using chamber of the three-way valve is connected to the water-using appliance, and the inlet water chamber of the three-way valve is connected to an external water circuit and the water heater.

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