Temperature control valve, water return device and water heater

Abstract

The utility model belongs to the technical field of water heaters, and particularly discloses a temperature control valve, a water return device and a water heater. The temperature control valve comprises a valve seat assembly, a valve element assembly, a stop sealing piece and a bimetallic strip. The valve seat assembly is provided with a water passing cavity, a pilot water inlet channel and a pilot water outlet channel. A pressure regulating cavity is defined by the valve element assembly and the valve seat assembly, and the pilot water inlet channel communicates with the water passing cavity and the pressure regulating cavity; the stop sealing piece is installed in the water passing cavity and surrounds the pilot water inlet channel. The bimetallic strip is installed in the water passing cavity, the bimetallic strip can be separated from the stop sealing piece when the water inlet temperature of the pilot water inlet channel is lower than the preset temperature and can abut against the stop sealing piece when the water inlet temperature is equal to or higher than the preset temperature, and the pilot water inlet channel is arranged right opposite to the center area of the bimetallic strip. According to the water return device, the preheating circulating channel can be automatically connected and disconnected, the flow of circulating water is ensured, the preheating efficiency is improved, and the use reliability of the water return device and the water heater is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of water heaters, in particular to a temperature control valve, a water return device and a water heater. Background Art

[0002] Water heaters are one of the common electrical appliances that are indispensable in modern household life. They can better meet the demand for hot water. According to different heating methods, existing water heaters are generally divided into electric water heaters and gas water heaters.

[0003] like Figure 1 As shown, the prior art provides a return valve for a water heater, which includes a main valve body 100' and a control valve. The main valve body 100' includes a cold water pipe, a water pipe 102' and a hot water pipe 101' connected in sequence. The water pipe 102' is provided with a main valve port connected to the hot water pipe 101'. The control valve includes a control base 200', a first water retaining assembly 300' and a second water retaining assembly 400' arranged on the main valve body 100'; the control base 200' is provided with a connecting chamber 203' and a pilot channel 201' connected to the hot water pipe 101', the control base 200' is provided with a water hole 202' connected to the connecting chamber 203', the first end of the pilot channel 201' is connected to the connecting chamber 203' and the second end is connected to the water pipe 102'; the first water retaining assembly 300' includes a first sealing member 301' arranged around the periphery of the first end of the pilot channel 201' and a bimetallic strip 302' arranged on the control base 200', the bimetallic strip 302' The bimetallic plate 302′ is configured to be able to produce deformation away from or abut against the first sealing member 301′ so that the connecting chamber 203′ is connected to or disconnected from the pilot channel 201′, and the first end of the pilot channel 201′ is arranged opposite the center of the bimetallic plate 302′; the second water retaining assembly 400′ includes a diaphragm 401′ base installed on the control base 200′, a diaphragm 401′ connected to the diaphragm 401′ base and a reset spring 403′, a connecting chamber 203′ is formed between the diaphragm 401′, the diaphragm 401′ base and the control base 200′, and a bypass hole 4021′ is provided on the diaphragm 401′ base, which is connected to the connecting chamber 203′ and the hot water pipe 101′.

[0004] In the return valve provided by the prior art, when no water flows through the hot water pipe 101′, the diaphragm 401′ blocks the main valve port under the action of the return spring 403′; when water flows into the hot water pipe 101′, the water flows through the bypass hole 4021′ on the base of the diaphragm 401′ into the connecting chamber 203′ and acts on the bimetallic strip 302′. If the water flow temperature is lower than the preset temperature, the bimetallic strip 302′ is deformed in a direction away from the first sealing member 301′ to open the first end of the pilot channel 201′, so that the water flow in the communicating chamber 203′ can flow into the water passage through the pilot channel 201′, thereby relieving the pressure of the communicating chamber 203′, so that the diaphragm 401′ opens the main valve port under the action of the pressure difference between the inside and the outside; when the water flow temperature is higher than the preset temperature, the bimetallic strip 302′ resets and blocks the first end of the pilot channel 201′, and the pressure difference on both sides of the diaphragm 401′ is gradually balanced through the communicating hole, and the diaphragm 401′ moves downward under the action of the reset spring 403′ to block the main valve port.

[0005] In the return valve provided by the prior art, the bimetallic strip 302′ blocks the first end of the pilot channel 201′ by abutting the first sealing member 301′. Therefore, when the bimetallic strip 302′ blocks the first end of the pilot channel 201′, the water pressure in the communicating chamber 203′ mainly acts on the circumferential side of the bimetallic strip 302′ away from the first sealing member 301′, or the water pressure acts on the end face of the bimetallic strip 302′ away from the first sealing member 301′, resulting in the water pressure always tending to close the bimetallic strip 302′, which is not conducive to the bimetallic strip 302′ deforming in the direction away from the first sealing member 301′ to open the first end of the pilot channel 201′, thereby increasing the difficulty of resetting the return valve, reducing the reliability of use, and increasing the difficulty of selecting the material for the bimetallic strip 302′. Utility Model Content

[0006] One of the technical problems solved by the present invention is to provide a temperature control valve, which can effectively solve the problem that the bimetallic strip in the existing temperature control valve is difficult to reset, thereby improving the reliability of the temperature control valve.

[0007] The second technical problem solved by the present invention is to provide a water return device, which can effectively solve the problem that the bimetallic strip of the temperature control valve of the existing water return device is difficult to reset, thereby improving the reliability of the water return device.

[0008] The third technical problem solved by the present invention is to provide a water heater, which can effectively solve the problem of the temperature control valve switching not being timely and sensitive due to the difficulty in resetting the bimetallic strip in the existing water heater, thereby improving the preheating efficiency and reliability of the water heater.

[0009] The first technical problem mentioned above is solved by the following technical solution:

[0010] A temperature control valve, comprising:

[0011] The valve seat assembly comprises a water passage cavity and a pilot water inlet channel and a pilot water outlet channel communicated with the water passage cavity;

[0012] a valve core assembly mounted on the valve seat assembly and enclosing a pressure regulating chamber with the valve seat assembly; the pilot water inlet channel communicating with the water passage chamber and the pressure regulating chamber; the valve core assembly having a water through hole communicating with the pressure regulating chamber and the hot water channel; the valve core assembly being capable of moving toward or away from the water passage chamber under the action of a pressure differential between the inside and outside;

[0013] a stop seal, mounted on a side wall of the water passage cavity facing the valve core assembly and arranged around the pilot water inlet channel, wherein the pilot water outlet channel is located outside the stop seal;

[0014] A bimetallic strip is installed in the water passage cavity. The bimetallic strip can be separated from the stop seal when the water inlet temperature of the pilot water inlet channel is lower than a preset temperature, so that the pilot water inlet channel and the pilot water outlet channel are connected through the water passage cavity. The bimetallic strip can press against the stop seal when the water inlet temperature is equal to or higher than the preset temperature to block the pilot water inlet channel. The pilot water inlet channel is arranged opposite the center area of ​​the bimetallic strip.

[0015] The temperature control valve described in the present invention has the following beneficial effects compared with the background technology: since the stop seal is arranged around the pilot water inlet channel, and the pilot water inlet channel is opposite to the central area of ​​the bimetallic strip, the pilot water inlet channel and the stop seal are located on the same side of the bimetallic strip. Therefore, when the bimetallic strip presses against the stop seal and blocks the pilot water inlet channel, the water pressure in the pilot water inlet channel acts on the central area of ​​the bimetallic strip, and applies water pressure to the bimetallic strip to keep it away from the stop seal, which is beneficial when the water inlet temperature is lower than the preset temperature. The bimetallic strip returns to a state of separation from the stop seal under the action of its own restoring force and the water inlet pressure of the pilot water inlet channel, so that the temperature required for the bimetallic strip to reset can be increased. The water pressure acting on the central area of ​​one end of the bimetallic strip near the seal can effectively reduce the difficulty of resetting the bimetallic strip, improve the resetting effect of the bimetallic strip, improve the operating reliability of the temperature control valve, and reduce the difficulty of selecting materials for the bimetallic strip.

[0016] In one embodiment, a mounting ring groove is provided on the wall of the water passage cavity, the periphery of the bimetallic strip is inserted into the mounting ring groove, and the groove width of the mounting ring groove is greater than the thickness of the bimetallic strip.

[0017] In one embodiment, the bimetallic strip divides the water passage cavity into a water inlet cavity and a water outlet cavity, the stop seal is provided in the water inlet cavity, the pilot water inlet channel is in communication with the water inlet cavity, and the water inlet end of the pilot water outlet channel is in communication with the water outlet cavity;

[0018] A water through hole is provided on the bimetallic strip, and the water through hole is located radially outside the stop seal. The water through hole communicates with the water inlet cavity and the water outlet cavity.

[0019] In one embodiment, the valve seat assembly includes a valve base and a valve cover, wherein the first end of the valve cover is inserted into the valve base and enclosed with the valve base to form the water passage cavity and the mounting ring groove, and the valve core assembly is connected to a side of the valve base away from the valve cover;

[0020] The pilot water inlet channel and the pilot water outlet channel are both arranged on the valve base, and a water hole is provided on the side wall of the valve cover, and the water hole is directly connected with the pilot water outlet channel.

[0021] In one embodiment, the valve base includes a base and a mounting seat which are separately arranged, the valve cover and the valve core assembly are respectively installed at both ends of the base, the pilot water outlet channel is arranged on the base, the mounting seat is installed inside the base and is surrounded by the valve cover to form the mounting ring groove, and the bimetallic strip is supported on the mounting seat.

[0022] In one embodiment, the mounting seat comprises a first positioning ring portion and a second positioning ring portion arranged around the outside of the first positioning ring portion, the end surface of the first positioning ring portion abuts against the first end surface of the valve cover, the end surface of the second positioning ring portion is spaced apart from the first end surface of the valve cover, and the first positioning ring portion, the second positioning ring portion and the valve cover together form the mounting ring groove;

[0023] And / or, the mounting seat is a metal part, and the base is a plastic part.

[0024] In one embodiment, the base includes a base plate portion and a first surrounding wall portion and a second surrounding wall portion respectively protruding from opposite sides of the base plate portion, the first surrounding wall portion is connected to the valve cover, the valve core assembly is mounted on the second surrounding wall portion, the pilot water inlet channel is opened in the base plate portion, the mounting seat is mounted on the base plate portion and arranged around the pilot water inlet channel, and the stop seal is mounted on the base plate portion or the mounting seat;

[0025] Alternatively, the base has a cavity with two through ends, the valve cover and the valve core assembly are respectively installed at the two ends of the base, the valve core assembly is installed at the other end of the base, the mounting seat is installed inside the base, and the pilot water inlet channel and the stop seal are both arranged on the mounting seat, the mounting seat, the base and the valve cover together form the water passage cavity, and the mounting seat, the base and the valve core assembly together form the pressure regulating cavity.

[0026] In one embodiment, the diameter of the water hole is smaller than the diameter of the pilot water inlet channel and the diameter of the pilot water outlet channel;

[0027] And / or, the water passage cavity has two end cavity walls arranged opposite to each other and a circumferential cavity wall connected between the two end cavity walls, the pilot water inlet channel passes through one of the end cavity walls, the water inlet port of the pilot water outlet channel passes through the circumferential cavity wall, and the water outlet port of the pilot water outlet channel passes through the outer wall of the valve seat assembly.

[0028] The second technical problem mentioned above is solved by the following technical solution:

[0029] A water return device, comprising:

[0030] A valve body, wherein the valve body has a hot water channel, a connecting channel, and a cold water channel arranged in sequence, the connecting channel is unidirectionally connected to the cold water channel, and a valve port is provided between the hot water channel and the connecting channel;

[0031] As described above, the temperature control valve is sealed and installed on the valve body, the water hole is connected to the hot water channel, the pilot water channel is connected to the connecting channel, the valve core assembly can move away from the water passage cavity and block the valve port, and the valve core assembly can move toward the water passage cavity to open the valve port.

[0032] Compared with the background technology, the return water device described in the present invention has the following beneficial effects: by adopting the above-mentioned temperature control valve, it is possible to realize automatic on-off control of the hot water channel and the cold water channel based on the water inlet temperature of the hot water channel, thereby reducing the control cost, and can improve the consistency and stability of the water flow from the hot water channel to the cold water channel when the temperature control valve is in the open state, thereby improving the preheating efficiency, reducing the user waiting time, and improving the reliability of the return water device.

[0033] The second technical problem mentioned above is solved by the following technical solution:

[0034] A water heater comprises a cold water pipe, a hot water pipe and the water return device as described above, wherein the hot water channel is connected to the hot water pipe, and the cold water channel is connected to the cold water pipe.

[0035] Compared with the background technology, the water heater described in the present invention has the following beneficial effects: by adopting the above-mentioned return water device, the preheating cycle efficiency can be improved, the user waiting time can be reduced, and the reliability of the water heater can be improved, thereby improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A schematic diagram of the structure of a backwater valve provided by the prior art;

[0037] Figure 2 A schematic structural diagram of a water return device provided in Example 1 of the present utility model;

[0038] Figure 3 A partial cross-sectional view of the temperature control valve of the water return device provided in Example 1 of the present utility model when it is in an open state;

[0039] Figure 4 A cross-sectional view of the water return device provided in Example 1 of the present utility model when the temperature control valve is in a closed valve state;

[0040] Figure 5 for Figure 4 A partial enlarged view of point I in the middle;

[0041] Figure 6 This is a schematic structural diagram of the temperature control valve provided in Example 1 of the present utility model;

[0042] Figure 7 This is a schematic diagram of the disassembled structure of the temperature control valve provided in Example 1 of the present utility model;

[0043] Figure 8 A cross-sectional view of a temperature control valve provided in Example 1 of the present utility model;

[0044] Figure 9 for Figure 8 A partial enlarged view of the middle J;

[0045] Figure 10 A schematic structural diagram of the valve cover provided in Example 1 of the present utility model;

[0046] Figure 11 A schematic structural diagram of a base provided in Example 1 of the present utility model;

[0047] Figure 12 A cross-sectional view of a base provided in Example 1 of the present utility model;

[0048] Figure 13 A schematic structural diagram of a mounting base provided in Example 1 of the present utility model;

[0049] Figure 14 A partial cross-sectional view of the water return device provided in Example 2 of the present utility model when the temperature control valve is in a closed valve state;

[0050] Figure 15 A schematic structural diagram of a base provided in Example 2 of the present utility model;

[0051] Figure 16 A cross-sectional view of a base provided in Example 2 of the present utility model;

[0052] Figure 17 A schematic structural diagram of a mounting base provided in Example 2 of the present utility model;

[0053] Figure 18 A cross-sectional view of a mounting base provided in Example 2 of the present utility model;

[0054] Figure 19 A cross-sectional view of a temperature control valve provided in Example 3 of the present utility model;

[0055] Figure 20 A cross-sectional view of a base provided in Example 3 of the present utility model;

[0056] Figure 21 This is a cross-sectional view of the mounting base provided in Example 3 of the present utility model.

[0057] Description of labels:

[0058] 100′, main valve body; 101′, hot water pipe; 102′, water flow pipe; 200′, control base; 201′, pilot channel; 202′, water flow hole; 203′, communication chamber; 300′, first water retaining assembly; 301′, first sealing element; 302′, bimetallic strip; 400′, second water retaining assembly; 401′, diaphragm; 402′, diaphragm base; 4021′, bypass hole; 403′, return spring;

[0059] 100, temperature control valve; 200, valve body; 201, hot water channel; 202, cold water channel; 203, connecting channel; 204, valve port; 205, water outlet hole; 300, one-way valve;

[0060] 1. Valve seat assembly; 11. Valve base; 111. Base; 1111. First surrounding wall; 1112. Second surrounding wall; 1113. Base plate; 1114. Water outlet; 11141. Insertion tube; 1115. Positioning post; 1116. Positioning groove; 1117. Sealing groove; 112. Mounting seat; 1121. Bottom plate; 11211. Positioning hole; 1122. First positioning ring; 11221. Support step surface; 1123 , second positioning ring; 11231, mounting step surface; 1124, avoidance water outlet; 113, pilot water inlet channel; 114, pilot water outlet channel; 115, sealing ring groove; 116, water retaining seal; 12, valve cover; 121, mounting plate; 122, mounting cylinder; 1221, outer ring groove; 1222, water hole; 13, water passage cavity; 131, water inlet cavity; 132, water outlet cavity; 14, mounting ring groove; 15, waterproof seal;

[0061] 2. Bimetallic strip; 21. Water outlet;

[0062] 3. Stop seal;

[0063] 5. Valve core assembly; 51. Diaphragm; 52. Blocking piece; 521. Water hole;

[0064] 6. Reset parts;

[0065] 10. Pressure regulating chamber. DETAILED DESCRIPTION

[0066] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are only part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0067] In the description of this application, it should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0068] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature specified as "first" or "second" may explicitly or implicitly include one or more of such features. Throughout this application, unless otherwise specified, "plurality" means two or more.

[0069] In the description of this application, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in this application based on the specific circumstances.

[0070] Example 1

[0071] This embodiment provides a water return device, which can be used in a gas water heater and connected between the hot water pipe and the cold water pipe to realize automatic on-off setting of the hot water pipe and the cold water pipe, thereby realizing the switching of the gas water heater between the preheating circulation mode and the normal water supply mode.

[0072] Specifically, if Figures 2 to 4 As shown, the return water device includes a valve body 200, a temperature control valve 100, and a one-way valve 300. The valve body 200 has a cold water channel 202, a hot water channel 201, and a connecting channel 203. The hot water channel 201 is connected to the hot water pipe for water to flow in, and the cold water channel 202 is connected to the cold water pipe for cold water to flow out. The temperature control valve 100 is installed on the valve body 200. When the inlet water temperature of the hot water channel 201 is lower than a preset temperature, the temperature control valve 100 can connect the hot water channel 201 and the cold water channel 202. When the inlet water temperature is greater than or equal to the preset temperature, the temperature control valve 100 blocks the connection between the hot water channel 201 and the cold water channel 202. The one-way valve 300 is disposed in the connecting channel 203 and is located between the temperature control valve 100 and the cold water channel 202. The one-way valve 300 only allows water to flow from the hot water channel 201 to the cold water channel 202, thereby preventing water in the cold water channel 202 from flowing into the hot water channel 201.

[0073] In this embodiment, the temperature control valve 100 includes a valve seat assembly 1, a bimetallic strip 2, a stop seal 3, and a valve core assembly 5. The valve seat assembly 1 has a water passage 13, a pilot water inlet channel 113, and a pilot water outlet channel 114. The valve core assembly 5 is mounted on the first end of the valve seat assembly 1 and forms a pressure regulating chamber 10 with the valve seat assembly 1. The pilot water inlet channel 113 connects the pressure regulating chamber 10 and the water passage 13. A water hole 521 is formed through the valve core assembly 5, connecting the pressure regulating chamber 10 and the hot water channel 201. The valve core assembly 5 can move toward or away from the water passage 13 under the action of the pressure difference between the inside and outside. The stop seal 3 is mounted on the side of the water passage 13 facing the valve core assembly 5. The wall is arranged around the pilot water inlet channel 113, and the pilot water outlet channel 114 is located on the outside of the stop seal 3; the bimetallic strip 2 is installed in the water passage chamber 13, and the bimetallic strip 2 can be separated from the stop seal 3 when the water inlet temperature of the pilot water inlet channel 113 is lower than the preset temperature, so that the pilot water inlet channel 113 and the pilot water outlet channel 114 are connected through the water passage chamber 13, and the bimetallic strip 2 can press the stop seal 3 when the water inlet temperature is equal to or higher than the preset temperature to block the pilot water inlet channel 113, and the pilot water inlet channel 113 is arranged opposite the center area of ​​the bimetallic strip 2.

[0074] A valve port 204 is provided between the hot water channel 201 and the connecting channel 203. The water hole 521 is in communication with the hot water channel 201, and the primary water channel 114 is in communication with the connecting channel 203. For ease of description, the state of the bimetallic strip 2 when the inlet water temperature is lower than a preset temperature is referred to as the first state, and the state of the bimetallic strip 2 when the inlet water temperature is higher than or equal to the preset temperature is referred to as the second state.

[0075] When water flows into the hot water channel 201, the water in the hot water channel 201 flows to the pressure regulating chamber 10 through the water hole 521 and enters the pilot water inlet channel 113. When the water inlet temperature of the water flow is lower than the preset temperature, the bimetallic strip 2 disengages from the stop seal 3, so that the pilot water inlet channel 113 is connected with the pilot water outlet channel 114 through the water passage chamber 13, and then the water flows out to the connecting channel 203 through the pilot water inlet channel 113, the water passage chamber 13 and the pilot water outlet channel 114 in turn. Under the action of the pressure difference on the two sides, the valve core assembly 5 moves in the direction toward the water passage chamber 13 and opens the valve port 204, so that the hot water channel 201 and the connecting channel 203 are connected through the valve port 204. At this time, the temperature control valve 100 is in the open valve state.

[0076] When the water inlet temperature in the pilot water inlet channel 113 is greater than or equal to the preset temperature, the bimetallic strip 2 is deformed and abuts against the stop seal 3, and the connection between the pilot water inlet channel 113 and the water passage chamber 13 is blocked by the bimetallic strip 2 and the stop seal 3. The water flow in the hot water channel 201 can only flow into the pilot water inlet channel 113 and cannot flow into the pilot water outlet channel 114, thereby gradually increasing the water pressure in the pressure regulating chamber 10, and the valve core assembly 5 moves in the direction away from the water passage chamber 13 and blocks the valve port 204. At this time, the temperature control valve 100 reaches a closed state, the connection between the hot water channel 201 and the cold water channel 202 is blocked, and the preheating cycle ends.

[0077] The temperature control valve 100 and the return water device provided by the present invention are provided with a bimetallic strip 2 whose deformation state is controlled by the inlet water temperature, and the bimetallic strip 2 is made to conduct the pilot water inlet channel 113 and the pilot water outlet channel 114 when the inlet water temperature is lower than the preset water temperature, thereby making the valve core component 5 open the valve port 204. When the water flow temperature in the hot water channel 201 is low, the water flow in the hot water channel 201 can flow through the valve port 204 to the connecting channel 203 and then to the cold water channel 202, thereby realizing the conduction of the circulating preheating circuit; when the inlet water temperature is higher than or equal to the preset temperature, The bimetallic strip 2 abuts against the stop seal 3, so that the water flow in the hot water channel 201 can only reach the pilot water inlet channel 113 and cannot flow to the connecting channel 203. At the same time, the valve core assembly 5 moves synchronously in the direction away from the water passage chamber 13 due to the increase in water pressure in the pressure regulating chamber 10 and blocks the valve port 204, so that the hot water channel 201 and the cold water channel 202 are disconnected, and the preheating cycle ends. In this way, the preheating cycle can be automatically turned on and off according to the change in water temperature in the hot water channel 201, reducing the control cost. At the same time, since the bimetallic strip 2 is stable below the preset temperature, the preheating cycle can be automatically turned on and off according to the change in water temperature in the hot water channel 201, reducing the control cost. The first state is maintained, and the second state is maintained when the temperature is higher than or equal to the preset temperature. The deformation when the temperature reaches the preset temperature is a sudden change rather than a linear gradual change, so that when the inlet water temperature is lower than the preset temperature, the conduction state of the pilot water inlet channel 113 and the pilot water outlet channel 114 can remain stable, that is, the opening degree of the valve core component 5 opening the valve port 204 is basically the same, thereby ensuring that when the preheating circulation loop is conducted, the circulating water flow rate can remain roughly stable, avoiding the change of the circulating water flow rate with the change of the preheating temperature or even the problem of too small circulating water flow rate, thereby improving the preheating efficiency. rate, shortening the preheating time, thereby reducing the waiting time of users, and at the same time avoiding the influence of the ambient temperature on the temperature control valve 100, ensuring the stability and reliability of the temperature control valve 100; moreover, since the valve port 204 is blocked by the valve core assembly 5 and the water inlet temperature is lower than the preset temperature, the water in the hot water channel 201 can flow to the cold water channel 202 through the water hole 521, the pressure regulating chamber 10, the pilot water inlet channel 113, the water chamber 13 and the pilot water outlet channel 114 in sequence, so that the conduction of the preheating circulation loop is opened before the valve port 204 is opened, further improving the preheating efficiency.

[0078] At the same time, the temperature control valve and return water device provided in this embodiment are provided with a stop seal 3 surrounding the pilot water inlet channel 113, and the pilot water inlet channel 113 is directly opposite the central area of ​​the bimetallic strip 2, so that the pilot water inlet channel 113 and the stop seal 3 are located on the same side of the bimetallic strip 2. Therefore, when the bimetallic strip 2 presses against the stop seal 3 and blocks the pilot water inlet channel 113, the water pressure in the pilot water inlet channel 113 acts on the central area of ​​the bimetallic strip and exerts pressure on the bimetallic strip 2 to keep it away from the stop seal 3. water pressure, so that when the water inlet temperature is lower than the preset temperature, the bimetallic strip 2 returns to the state of being separated from the stop seal 3 under the action of its own restoring force and the water inlet pressure of the pilot water inlet channel 113, so that the temperature required for the resetting of the bimetallic strip 2 can be increased. Combined with the water pressure acting on the central area of ​​one end of the bimetallic strip 2 close to the seal, the difficulty of resetting the bimetallic strip 2 can be effectively reduced, the resetting effect of the bimetallic strip 2 can be improved, the operating reliability of the temperature control valve 100 can be improved, and the difficulty of selecting materials for the bimetallic strip 2 can be reduced.

[0079] To facilitate installation of the thermostatic valve 100 on the valve body 200, the valve body 200 defines an installation cavity with one end open. One end of the valve seat assembly 1 and the valve core assembly 5 are installed in the installation cavity. The end of the valve seat assembly 1, which includes the water passage cavity 13, is located outside the installation cavity, reducing the space required for the installation cavity. Furthermore, the valve seat assembly 1 has a positioning step surface that abuts the open end surface of the installation cavity to ensure that the thermostatic valve 100 is properly positioned on the valve body 200.

[0080] In one embodiment, the valve seat assembly 1 has a spigot portion 11141 protruding from a positioning step surface, and the outlet of the preliminary water outlet channel 114 extends through the end of the spigot portion 11141. A water outlet through-hole 205 is provided on the valve body 200. The first end of the water outlet through-hole 205 is connected to the connecting channel 203, and the second end of the water outlet through-hole 205 extends through the open end surface of the mounting valve cavity. The spigot portion 11141 is inserted into the water outlet through-hole 205, and the preliminary water outlet channel 114 is connected to the water outlet through-hole 205. This helps improve the reliability and convenience of the connection between the preliminary water outlet channel 114 and the connecting channel 203. Furthermore, a water outlet sealing ring is provided between the spigot portion 11141 and the wall of the water outlet through-hole 205 to prevent water in the water outlet through-hole 205 from flowing out through the gap between the water outlet portion 1114 and the valve body 200.

[0081] The valve core assembly 5 includes a diaphragm 51 and a sealing member 52. The periphery of the diaphragm 51 is sandwiched between the valve seat assembly 1 and the valve body 200. This seals the connection between the valve seat assembly 1 and the valve body 200 while allowing the diaphragm 51 to deform under the pressure differential between the two sides, thereby enabling movement of the valve core assembly 5. The sealing member 52 is connected to the diaphragm 51 and opens or closes the valve port 204 as the diaphragm 51 deforms. The water hole 521 is preferably formed on the sealing member 52 to facilitate its processing.

[0082] In one embodiment, the temperature-controlled valve 100 further includes a reset member 6 installed in the pressure-regulating chamber 10, with its ends respectively abutting the valve seat assembly 1 and the valve core assembly 5. The reset member 6 constantly applies an elastic force to the valve core assembly 5, forcing the valve core assembly 5 away from the water passage chamber 13. Thus, when the bimetallic strip 2 blocks the pilot water inlet passage 113, the water passage hole 521 balances the pressure in the water inlet passage and the pressure-stabilizing chamber, substantially eliminating the pressure differential on opposite sides of the valve core assembly 5. The valve core assembly 5, under the elastic restoring force of the reset member 6, moves away from the water passage chamber 13 and blocks the valve port 204, ensuring the reliability of the valve core assembly 5 in blocking the valve port 204.

[0083] The reset member 6 abuts against the blocking member 52 so that the elastic force of the reset member 6 is directly used for the blocking member 52 , while also avoiding the problem of the reset member 6 directly contacting the diaphragm 51 and causing the main diaphragm to be damaged by force, thereby improving the reliability of the valve core assembly 5 .

[0084] In one embodiment, the diameter of the water hole 521 is smaller than the diameter of the pilot water inlet channel 113 and the diameter of the pilot water outlet channel 114. As a result, when the bimetallic strip 2 is in the first state, the water flowing out of the pilot water outlet channel 114 flows at a faster rate than the water flowing into the water hole 521. This rapidly reduces the water pressure in the pressure-regulating chamber 10, increasing the pressure differential between opposite sides of the valve core assembly 5. This facilitates the valve core assembly 5 to quickly deform toward the water chamber 13 under the action of the pressure differential, increasing the speed at which the valve core assembly 5 opens the valve port 204, and thereby improving preheating efficiency.

[0085] To facilitate the installation of the pilot water outlet channel 114, in one embodiment, the water passage chamber 13 has two oppositely disposed end walls and a peripheral wall connected between the two end walls. The pilot water inlet channel 113 extends through one end wall, the water inlet port of the pilot water outlet channel 114 extends through the peripheral wall, and the water outlet port of the pilot water outlet channel 114 extends through the outer wall of the valve seat assembly 1. In other embodiments, the water inlet port of the pilot water outlet channel 114 also directly extends through the end wall of the water passage chamber 13.

[0086] Specifically, the first water outlet channel 114 is arranged in an L-shape, with a water inlet port at one end and a water outlet port at the other end, and the water outlet port is communicated with the water outlet through-hole 205 .

[0087] like Figures 7 to 9 As shown, in order to improve the installation stability of the bimetallic strip 2 in the water passage cavity 13, an annular mounting groove 14 is provided on the peripheral wall of the water passage cavity 13. The peripheral edge of the bimetallic strip 2 is inserted into the mounting groove 14, and the groove width of the mounting groove 14 is greater than the thickness of the bimetallic strip 2. By providing the mounting groove 14, the bimetallic strip 2 can be installed and positioned in the water passage cavity 13, the movement of the bimetallic strip 2 in the water passage cavity 13 can be restricted, and the installation stability and reliability of the bimetallic strip 2 in the water passage cavity 13 can be ensured. At the same time, because the groove width of the mounting groove 14 is greater than the thickness of the bimetallic strip 2, the peripheral edge of the bimetallic strip 2 can have a certain amount of movement space in the mounting groove 14, better meeting the deformation requirements of the bimetallic strip 2.

[0088] Furthermore, the groove width of the mounting ring groove 14 is less than twice the thickness of the bimetallic strip 2 to avoid the groove width of the mounting ring groove 14 being too large, which may cause the periphery of the bimetallic strip 2 to slip out of the mounting ring groove 14, thereby better ensuring the stability of the bimetallic strip 2 in the mounting ring groove 14.

[0089] The bimetallic strip 2 divides the water passage chamber 13 into an inlet chamber 131 and an outlet chamber 132. The stop seal 3 is located in the inlet chamber 131. The pilot water inlet channel 113 communicates with the inlet chamber 131, and the pilot water outlet channel 114 communicates with the outlet chamber 132. The volume of the inlet chamber 131 is smaller than that of the outlet chamber 132, which facilitates the deformation of the bimetallic strip 2 to press against the stop seal 3, reducing the amount of deformation required to press against the stop seal 3 and making the selection of the bimetallic strip 2 easier.

[0090] In one embodiment, the bimetallic strip 2 is provided with a water opening 21, which is located radially outward of the stop seal 3 and connects the water inlet cavity 131 with the water outlet cavity 132. This ensures smooth flow of water from the water inlet cavity 131 to the water outlet cavity 132 when the bimetallic strip 2 is in the first state, and helps increase the amount of water flowing from the pilot water inlet channel 113 to the pilot water outlet channel 114. Preferably, a plurality of water openings 21 are provided at intervals along the circumference of the bimetallic strip 2.

[0091] In order to better realize the installation of the stop seal 3, a sealing ring groove 115 is opened on the cavity wall of the water cavity 13. The stop seal 3 is installed in the sealing ring groove 115 and partially protrudes from the sealing ring groove 115, thereby realizing the installation and positioning of the stop seal 3 on the valve seat assembly 1.

[0092] It is worth noting that when the bimetallic strip 2 is in the first state, the distance between the stop seal 3 and the bimetallic strip 2 should be determined according to the deformation amount of the bimetallic strip 2 when it is deformed from the first state to the second state, and should be specifically set according to the reset temperature and deformation temperature of the bimetallic strip 2. The present utility model does not limit this.

[0093] The cross-sections of the bimetallic strip 2 and the water passage cavity 13 are both circular structures. The stop seal 3 is coaxially arranged with the bimetallic strip 2, and the pilot water inlet channel 113 is directly opposite the center of the bimetallic strip 2 to ensure the consistency of the force applied to the bimetallic strip 2 in the circumferential direction, thereby improving the reliability of the deformation and reset of the bimetallic strip 2.

[0094] like Figures 3 to 5 As shown, to facilitate installation of the stop seal 3 and the bimetallic strip 2, the valve seat assembly 1 includes a valve base 11 and a valve cover 12. The first end of the valve cover 12 is inserted into the valve base 11 and encloses the valve base 11 to form a water passage cavity 13 and an installation ring groove 14. The valve core assembly 5 is connected to the side of the valve base 11 away from the valve cover 12. The pilot water inlet channel 113 and the pilot water outlet channel 114 are both provided on the valve base 11, and a water hole 1222 is provided on the side wall of the valve cover 12. This arrangement allows the bimetallic strip 2 to be installed and removed from the water passage cavity 13 by removing the valve cover 12 from the valve base 11, simplifying the structure of the valve seat assembly 1 and reducing the difficulty of processing the valve seat assembly 1.

[0095] like Figures 6 to 8 As shown, the valve cover 12 includes a connected mounting plate portion 121 and a mounting cylinder portion 122, the valve base 11 has a first groove and a second groove, the notches of the first groove and the second groove are arranged oppositely, the mounting cylinder portion 122 is inserted into the first groove, and the end surface of the mounting cylinder portion 122 and the valve base 11 are surrounded to form a mounting ring groove 14; the mounting plate portion 121 abuts against the grooved end surface of the first groove to limit the depth of the mounting cylinder portion 122 inserted into the first groove.

[0096] Furthermore, the mounting plate portion 121 is connected to the valve base 11 by fastening screws, which pass through the mounting plate portion 121 and are screwed into the valve base 11 to improve the stability and reliability of the connection between the valve cover 12 and the valve base 11. Preferably, a plurality of fastening screws are arranged at intervals around the water passage cavity 13.

[0097] Furthermore, the fastening screw passes through the valve base 11 and is fastened to the valve body 200 , so as to simplify the structure of the water return device and reduce the number of parts of the water return device.

[0098] To prevent water leakage from the connection between the valve base 11 and the valve cover 12, in one embodiment, a waterproof seal 15 is provided between the valve base 11 and the valve cover 12. The water inlet port of the first water outlet channel 114 is located on the side of the waterproof seal 15 facing the valve core assembly 5. Specifically, the waterproof seal 15 is sandwiched between the mounting cylinder 122 and the inner sidewall of the valve base 11.

[0099] An outer ring groove 1221 is formed on the outer side wall of the mounting tube 122 . The waterproof seal 15 is mounted in the outer ring groove 1221 and squeezed between the groove wall of the first groove and the groove bottom of the outer ring groove 1221 , so as to realize the installation and positioning of the waterproof seal 15 through the outer ring groove 1221 .

[0100] A water hole 1222 is defined on the outer wall of the mounting tube 122 . The water hole 1222 is directly opposite to the water inlet of the first water outlet channel 114 to prevent the mounting tube 122 from affecting the flow of water from the water passage cavity 13 to the first water outlet channel 114 .

[0101] like Figures 8 to 13 As shown, in one embodiment, the valve base 11 includes a base 111 and a mounting seat 112 that are separately provided. The valve cover 12 and the valve core assembly 5 are respectively installed at both ends of the base 111. The first water outlet channel 114 is provided on the base 111. The mounting seat 112 is installed inside the base 111 and is surrounded by the valve cover 12 to form a mounting ring groove 14. The bimetallic strip 2 is supported on the mounting seat 112. The mounting seat 112 and the base 111 are provided separately, which facilitates the separate processing of the mounting seat 112 and the base 111, thereby improving the processing accuracy of the supporting surface of the bimetallic strip 2, thereby ensuring the reliability of the deformation and reset of the bimetallic strip 2; at the same time, it reduces the processing requirements for the base 111, thereby reducing the overall processing cost of the valve base 11.

[0102] In one embodiment, the mounting seat 112 includes a first positioning ring portion 1122 and a second positioning ring portion 1123 disposed around the outside of the first positioning ring portion 1122. The end surface of the first positioning ring portion 1122 abuts the first end surface of the valve cover 12, and the end surface of the second positioning ring portion 1123 is spaced apart from the first end surface of the valve cover 12. The first positioning ring portion 1122, the second positioning ring portion 1123, and the valve cover 12 together form a mounting ring groove 14. Thus, by fine-machining the end surfaces of the first positioning ring portion 1122 and the second positioning ring portion 1123, the shape of the mounting ring groove 14 can be controlled, thereby controlling the mounting position of the bimetallic strip 2.

[0103] Under this configuration, the end surface of the first positioning ring portion 1122 forms a support step surface 11221 for supporting the bimetallic strip 2, and the end surface of the second positioning ring portion 1123 forms an installation step surface 11231 for locating the installation position of the valve cover 12. A water avoidance port 1124 is provided on the side of the mounting seat 112. The water avoidance port 1124 is arranged directly opposite the water inlet port of the pilot water outlet channel 114 to prevent the configuration of the mounting seat 112 from affecting the flow of water into the pilot water outlet channel 114. At the same time, the configuration of the water avoidance port 1124 allows the water inlet port of the pilot water outlet channel 114 to be arranged closer to the valve core assembly 5, thereby reducing the height requirement of the entire valve seat assembly 1.

[0104] Furthermore, the mounting seat 112 also includes a bottom plate portion 1121, a first positioning ring portion 1122 and a second positioning ring portion 1123 protruding from the periphery of the bottom plate portion 1121. The setting of the bottom plate portion 1121 is conducive to enhancing the overall structural strength and rigidity of the mounting seat 112, so as to reduce the probability of deformation of the mounting seat 112 during processing and use, and improve the installation convenience of the mounting seat 112 on the base 111.

[0105] The mounting seat 112 is preferably made of metal and machined to ensure the machining accuracy of the support step surface 11221 and the mounting step surface 11231, thereby further ensuring the deformation and reset reliability of the bimetallic strip 2. The base 111 can be made of plastic to reduce cost and weight of the thermostatic valve 100.

[0106] In one embodiment, the pilot water inlet channel 113 is disposed on the base 111. Specifically, the base 111 and the valve cover 12 together form the water passage chamber 13, and the base 111 and the valve core together form the pressure regulating chamber 10. This simplifies the structure of the mounting base 112 and reduces the difficulty of manufacturing the mounting base 112. Furthermore, the pilot water inlet channel 113 is disposed on the base 111, resulting in a smoother surface, making it less prone to mineral deposition within the pilot water inlet channel 113. This reduces the formation of scale in the pilot water inlet channel 113, further reducing the probability of scale clogging the pilot water inlet channel 113 and improving the reliability and service life of the temperature control valve 100. Furthermore, a sealing ring groove 115 is disposed on the mounting plate portion 121 to further simplify the structure of the mounting base 112.

[0107] Specifically, the base 111 includes a substrate portion 1113 and a first surrounding wall portion 1111 and a second surrounding wall portion 1112 connected to opposite sides of the substrate portion 1113. The first surrounding wall portion 1111, the substrate portion 1113, and the valve cover 12 together form a water passage chamber 13. The second surrounding wall portion 1112 is connected to the valve core assembly 5 and together with the valve core assembly 5, forms a pressure regulating chamber 10. A pilot water inlet channel 113 is formed through the substrate portion 1113. The outer side of the first surrounding wall portion 1111 is connected to the water outlet portion 1114, which is provided with a pilot water outlet channel 114. The end of the water outlet portion 1114 has a cannula portion 11141. This structure facilitates the connection between the base 111 and the valve cover 12 and the valve core assembly 5. Specifically, a waterproof seal 15 is provided between the mounting cylinder 122 and the first surrounding wall portion 1111.

[0108] The cross-sectional area of ​​the first surrounding wall portion 1111 is larger than the cross-sectional area of ​​the second surrounding wall portion 1112 , that is, the substrate portion 1113 extends radially along the second surrounding wall portion 1112 , and the end surface of the substrate portion 1113 extending out of the second surrounding wall portion 1112 forms a positioning step surface abutting against the valve body 200 .

[0109] The second surrounding wall portion 1112 is preferably cylindrical, and the valve core assembly 5 is disc-shaped to ensure force stability and balance during movement of the valve core assembly 5. The first surrounding wall portion 1111 has a rectangular cross-section, and the water passage cavity 13 has a circular cross-section, so that the fastening screws can pass through the four corners of the first surrounding wall portion 1111 and connect to the valve body 200.

[0110] To ensure that the mounting seat 112 is positioned on the base 111, a positioning groove 1116 is formed on the base plate 1113, and the mounting seat 112 is disposed in the positioning groove 1116. Specifically, the bottom plate 1121 is disposed in the positioning groove 1116, and the thickness of the bottom plate 1121 is less than or equal to the thickness of the positioning groove 1116 to prevent the bottom plate 1121 from protruding from the positioning groove 1116 and affecting the deformation of the bimetallic strip 2.

[0111] To achieve the installation and positioning of the mounting base 112 on the base 111, one of the mounting base 112 and the base 111 is provided with a positioning hole 11211, and the other is provided with a positioning post 1115, which is inserted into the positioning hole 11211. In one embodiment, the positioning post 1115 is protruding from the base plate portion 1113, and the positioning hole 11211 is provided on the bottom plate portion 1121 of the mounting base 112.

[0112] This embodiment also provides a water heater, including a hot water pipe and a cold water pipe, and the aforementioned water return device, wherein the hot water channel 201 is connected to the hot water pipe, and the cold water channel 202 is connected to the cold water pipe. The aforementioned water return device can improve the efficiency of the preheating cycle, reduce user waiting time, and enhance the reliability of the water heater, thereby improving the user experience.

[0113] Example 2

[0114] This embodiment provides a water return device, and the structure of the water return device provided in this embodiment is basically the same as that in the first embodiment, with only some differences in the settings. This embodiment will no longer repeat the same structure as the above embodiment.

[0115] like Figures 14 to 18 As shown, in this embodiment, both ends of the base 111 are through-connected, and the valve cover 12 and the valve core assembly 5 are respectively mounted on the two ends of the base 111 and connected. The mounting base 112 is connected to the interior of the base 111. The mounting base 112, the base 111, and the valve core assembly 5 together form a pressure regulating chamber 10. The mounting base 112, the base 111, and the valve cover 12 together form a water passage chamber 13. The mounting base 112 is provided with a pilot water inlet channel 113, and the stop seal 3 is mounted on the mounting base 112. This simplifies the structure of the base 111.

[0116] The sealing ring groove 115 and the pilot water inlet channel 113 are both arranged on the mounting seat 112, which is beneficial to ensuring the coaxiality of the sealing ring groove 115 and the supporting step surface 11221, and is beneficial to ensuring that the pilot water inlet channel 113 is in the center position of the mounting seat 112 through fine processing, and ensuring that the stop seal 3 and the bimetallic strip 2 are concentrically arranged, that is, ensuring the consistency of the pressure of the bimetallic strip 2 on the stop seal 3 at all locations, so that the stop seal 3 and the bimetallic strip 2 have consistency in the circumferential direction of the stop seal 3, so that the two are tightly fitted to achieve the reliability of sealing the pilot water inlet channel 113, and are beneficial to achieving the resetting of the bimetallic strip 2.

[0117] Specifically, the base 111 includes a first surrounding wall portion 1111 and a second surrounding wall portion 1112. The cross-sectional area of ​​the first surrounding wall portion 1111 is larger than that of the second surrounding wall portion 1112. A mounting surface is formed at the junction of the first surrounding wall portion 1111 and the second surrounding wall portion 1112. The mounting seat 112 is mounted on the mounting surface to ensure the mounting position of the mounting seat 112. The first surrounding wall portion 1111, the mounting seat 112, and the valve cover 12 together form the water passage chamber 13. The second surrounding wall portion 1112, the mounting seat 112, and the valve core assembly 5 together form the pressure regulating chamber 10. The outer side of the first surrounding wall portion 1111 is connected to the water outlet portion 1114.

[0118] A positioning post 1115 is installed on the step surface 11231 , and a positioning hole 11211 is provided on the mounting seat 112 . The positioning post 1115 is inserted into the positioning hole 11211 to achieve installation and positioning of the mounting seat 112 on the base 111 .

[0119] A water-retaining seal ring 116 is disposed between the outer wall of the mounting seat 112 and the inner wall of the base 111 to prevent water in the pressure-regulating chamber 10 from flowing through the gap between the mounting seat 112 and the base 111 and into the water passage chamber 13. To facilitate the installation of the water-retaining seal ring 116, a sealing groove is defined in the outer wall of the mounting seat 112. The water-retaining seal ring 116 is disposed between the bottom of the sealing groove and the inner wall of the base 111. The sealing groove preferably extends through the side of the mounting seat 112 facing the valve core assembly 5 to simplify the structure of the mounting seat 112.

[0120] In this embodiment, other structures of the temperature control valve 100 and the water return device can be set with reference to the above embodiment, and this embodiment does not limit them.

[0121] Example 3

[0122] This embodiment provides a water return device, and the structure of the water return device provided in this embodiment is basically the same as that in the above embodiment, with only some differences in the settings. This embodiment will no longer repeat the same structure as the above embodiment.

[0123] like Figures 19 to 21 As shown, in this embodiment, the pilot water inlet channel 113 is provided on the base 111, and the stop seal 3 is mounted on the mounting seat 112. Specifically, the mounting seat 112 is provided with a sealing ring groove 115. This arrangement, because the sealing ring groove 115 and the supporting step surface 11221 are both provided on the mounting seat 112, allows for control of the machining accuracy of the sealing ring groove 115 and the supporting step surface 11221, ensuring that the sealing ring groove 115 and the supporting step surface 11221 are concentrically arranged, thereby ensuring that the stop seal 3 and the bimetallic strip 2 are concentrically arranged, that is, ensuring consistency in the pressure applied by the bimetallic strip 2 on the stop seal 3 at all locations, thereby improving the consistency in the pressure applied by the stop seal 3 and the bimetallic strip 2 in the circumferential direction of the stop seal 3, ensuring a close fit between the two, thereby achieving reliable sealing of the pilot water inlet channel 113, and facilitating the resetting of the bimetallic strip 2.

[0124] In this embodiment, an annular sealing groove 1117 is provided on the outer wall of the mounting seat 112 and the base plate portion 1113. The sealing groove 1117 on the mounting seat 112 and the base plate are connected to each other and jointly form a sealing mounting groove, and the water-retaining sealing ring 116 is provided in the sealing mounting groove.

[0125] In this embodiment, other structures of the temperature control valve 100 and the water return device can be set with reference to the above embodiment, and this embodiment does not limit them.

[0126] This embodiment also provides a water heater, including a hot water pipe and a cold water pipe, and the aforementioned water return device, wherein the hot water channel 201 is connected to the hot water pipe, and the cold water channel 202 is connected to the cold water pipe. The aforementioned water return device can improve the efficiency of the preheating cycle, reduce user waiting time, and enhance the reliability of the water heater, thereby improving the user experience.

[0127] In the specific contents of the above-mentioned specific implementation methods, the various technical features can be combined in any non-contradictory manner. In order to make the description concise, not all possible combinations of the above-mentioned technical features are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0128] The specific contents of the above-mentioned specific embodiments only express several embodiments of the present invention. Although the description is relatively specific and detailed, it should not be construed as limiting the scope of the present invention. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements fall within the scope of protection of the present invention. Therefore, the scope of protection of the present invention shall be based on the appended claims.

Claims

1. A temperature control valve, characterized in that: include: A valve seat assembly (1) comprises a water passage cavity (13) and a pilot water inlet channel (113) and a pilot water outlet channel (114) communicating with the water passage cavity (13); A valve core assembly (5) is mounted on the valve seat assembly (1) and encloses a pressure regulating chamber (10) with the valve seat assembly (1); the pilot water inlet channel (113) communicates with the water passage chamber (13) and the pressure regulating chamber (10); the valve core assembly (5) has a water through hole (521) communicating with the pressure regulating chamber (10) and the hot water channel (201); and the valve core assembly (5) can move in a direction toward or away from the water passage chamber (13) under the action of a pressure difference between the inside and outside. A stop seal (3) is installed on a side wall of the water passage cavity (13) facing the valve core assembly (5) and is arranged around the pilot water inlet channel (113), and the pilot water outlet channel (114) is located outside the stop seal (3); A bimetallic strip (2) is installed in the water passage cavity (13). The bimetallic strip (2) can be separated from the stop seal (3) when the water inlet temperature of the pilot water inlet channel (113) is lower than a preset temperature, so that the pilot water inlet channel (113) and the pilot water outlet channel (114) are connected through the water passage cavity (13). The bimetallic strip (2) can press against the stop seal (3) when the water inlet temperature is equal to or higher than a preset temperature to block the pilot water inlet channel (113). The pilot water inlet channel (113) is arranged opposite the central area of ​​the bimetallic strip (2).

2. The temperature control valve according to claim 1, characterized in that: The wall of the water passage cavity (13) is provided with a mounting ring groove (14), the periphery of the bimetallic strip (2) is inserted into the mounting ring groove (14), and the groove width of the mounting ring groove (14) is greater than the thickness of the bimetallic strip (2).

3. The temperature control valve according to claim 2, characterized in that: The bimetallic strip (2) divides the water passage cavity (13) into a water inlet cavity portion (131) and a water outlet cavity portion (132); the stop seal (3) is arranged in the water inlet cavity portion (131); the pilot water inlet channel (113) is in communication with the water inlet cavity portion (131); and the water inlet end of the pilot water outlet channel (114) is in communication with the water outlet cavity portion (132); The bimetallic strip (2) is provided with a water opening (21), the water opening (21) being located radially outside the stop seal (3), and the water opening (21) communicating with the water inlet cavity (131) and the water outlet cavity (132).

4. The temperature control valve according to claim 2, characterized in that: The valve seat assembly (1) comprises a valve base (11) and a valve cover (12); a first end of the valve cover (12) is inserted into the valve base (11) and enclosed with the valve base (11) to form the water passage cavity (13) and the mounting ring groove (14); and the valve core assembly (5) is connected to a side of the valve base (11) away from the valve cover (12); The pilot water inlet channel (113) and the pilot water outlet channel (114) are both arranged on the valve base (11), and a water hole (1222) is provided on the side wall of the valve cover (12), and the water hole (1222) is directly connected to the pilot water outlet channel (114).

5. The temperature control valve according to claim 4, characterized in that: The valve base (11) comprises a base (111) and a mounting seat (112) which are separately arranged. The valve cover (12) and the valve core assembly (5) are respectively mounted on both ends of the base (111). The pilot water channel (114) is arranged on the base (111). The mounting seat (112) is mounted inside the base (111) and is surrounded by the valve cover (12) to form the mounting ring groove (14). The bimetallic strip (2) is supported on the mounting seat (112).

6. The temperature control valve according to claim 5, characterized in that: The mounting seat (112) comprises a first positioning ring portion (1122) and a second positioning ring portion (1123) arranged around the outside of the first positioning ring portion (1122); the end surface of the first positioning ring portion (1122) abuts against the first end surface of the valve cover (12); the end surface of the second positioning ring portion (1123) is spaced apart from the first end surface of the valve cover (12); the first positioning ring portion (1122), the second positioning ring portion (1123) and the valve cover (12) together form the mounting ring groove (14); And / or, the mounting seat (112) is a metal part, and the base (111) is a plastic part.

7. The temperature control valve according to claim 5, characterized in that: The base (111) comprises a substrate portion (1113) and a first surrounding wall portion (1111) and a second surrounding wall portion (1112) respectively protruding from opposite sides of the substrate portion (1113); the first surrounding wall portion (1111) is connected to the valve cover (12); the valve core assembly (5) is mounted on the second surrounding wall portion (1112); the pilot water inlet channel (113) is opened on the substrate portion (1113); the mounting seat (112) is mounted on the substrate portion (1113) and is arranged around the pilot water inlet channel (113); and the stop seal (3) is mounted on the substrate portion (1113) or the mounting seat (112); Alternatively, the base (111) has a cavity with two through ends, the valve cover (12) and the valve core assembly (5) are respectively mounted on the two ends of the base (111), the valve core assembly (5) is mounted on the other end of the base (111), the mounting seat (112) is mounted inside the base (111), and the pilot water inlet channel (113) and the stop seal (3) are both arranged on the mounting seat (112), the mounting seat (112), the base (111) and the valve cover (12) together form the water passage cavity (13), and the mounting seat (112), the base (111) and the valve core assembly (5) together form the pressure regulating cavity (10).

8. The temperature control valve according to any one of claims 1 to 7, characterized in that: The diameter of the water hole (521) is smaller than the diameter of the pilot water inlet channel (113) and the diameter of the pilot water outlet channel (114); And / or, the water passage cavity (13) has two end cavity walls arranged opposite to each other and a peripheral cavity wall connected between the two end cavity walls, the pilot water inlet channel (113) passes through one of the end cavity walls, the water inlet port of the pilot water outlet channel (114) passes through the peripheral cavity wall, and the water outlet port of the pilot water outlet channel (114) passes through the outer wall of the valve seat assembly (1).

9. A water return device, characterized in that: include: A valve body (200), the valve body (200) having a hot water channel (201), a communication channel (203), and a cold water channel (202) arranged in sequence, the communication channel (203) leading to the cold water channel (202) being unidirectional, and a valve port (204) being provided between the hot water channel (201) and the communication channel (203); The temperature control valve according to any one of claims 1 to 8, wherein the temperature control valve is sealed and installed on the valve body (200), the water hole (521) is connected to the hot water channel (201), the first water outlet channel (114) is connected to the connecting channel (203), the valve core assembly (5) can move away from the water passage chamber (13) and block the valve port (204), and the valve core assembly (5) can move toward the water passage chamber (13) to open the valve port (204).

10. A water heater comprising a cold water pipe and a hot water pipe, characterized in that: The water heater includes the water return device according to claim 9, the hot water channel (201) is connected to the hot water pipe, and the cold water channel (202) is connected to the cold water pipe.

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