Combination valve and hot water system

Abstract

This utility model relates to the field of water heater technology, and more particularly to a combination valve and a hot water system. The combination valve includes a housing, a first valve core, a first reset element, a second valve core, and a second reset element. The first valve core is movably installed within the housing and is connected to a first locking structure. The first reset element drives the first valve core to close the return water inlet. The second valve core is movably installed within the housing and is connected to a second locking structure. The second reset element drives the second valve core to close the outlet water inlet. When the second valve core opens the outlet water inlet with the water flow, the first locking structure and the second locking structure interfere or cooperate to limit the first valve core, thereby locking the first valve core to close the return water inlet. When the second valve core closes the outlet water inlet, the first locking structure and the second locking structure release interference or cooperation, allowing the first valve core to open the return water inlet with the water flow. When cold water is used at the water outlet, the return water inlet is closed by the first valve core, preventing hot water from flowing into the cold water pipe, thus preventing the water heater from malfunctioning.

Description

Technical Field

[0001] This utility model relates to the field of water heater technology, and in particular to a combination valve and a hot water system. Background Technology

[0002] In existing hot water systems, a combination valve (return valve) is usually installed at the water-using end (such as a bathroom faucet or showerhead). The combination valve connects the cold water pipe and the hot water pipe to form a circulation pipeline. When the user activates the zero cold water function, the water pump in the water heater turns on, the combination valve is opened, and the hot water in the hot water pipe flows back to the cold water pipe through the combination valve. The water in the cold water pipe is heated by the water heater and then flows back to the hot water pipe, thus achieving circulation preheating.

[0003] When the zero-cold-water function of the hot water system is activated, the hot water pipe remains connected to the cold water pipe through a combination valve. When the user needs to use cold water, the hot water in the hot water pipe will flow out along with the cold water in the cold water pipe, causing the water heater to start erroneously and hot water to flow out of the cold water pipe. Utility Model Content

[0004] One of the technical problems solved by this utility model is to provide a combination valve that can effectively solve the technical problem in the prior art where the hot water pipe and the cold water pipe are connected after the zero cold water function is turned on, causing the water heater to start erroneously and hot water to flow out of the cold water pipe.

[0005] The second technical problem solved by this utility model is to provide a hot water system that can effectively solve the technical problem in the prior art where the hot water pipe is connected to the cold water pipe after the zero cold water function is turned on, causing the water heater to start erroneously and hot water to flow out of the cold water pipe.

[0006] The first technical problem mentioned above is solved by the following technical solution:

[0007] Combination valve, including:

[0008] The housing has an inlet, an outlet and a return outlet;

[0009] A first valve core is movably installed in the housing along the axial direction of the return water port to open the return water port; the first valve core is connected to a first locking structure;

[0010] A first reset element is disposed on the first valve core and is used to drive the first valve core to close the return water port;

[0011] The second valve core is movably installed in the housing along the axial direction of the outlet to open the outlet with the water flow; the second valve core is connected to a second locking structure;

[0012] The second reset element is disposed on the second valve core and is used to drive the second valve core to close the water outlet;

[0013] When the second valve core opens the outlet with the water flow, the first locking structure interferes with or cooperates with the second locking structure to limit the first valve core, so that the first valve core locks and closes the return outlet;

[0014] When the second valve core closes the outlet, the first locking structure and the second locking structure are released from interference or cooperation, so that the first valve core can open the return outlet with the water flow.

[0015] The combined valve described in this utility model has the following advantages compared with the prior art:

[0016] When the combination valve is applied to the zero-cold-water function of a hot water system, when the second valve core is driven to close the outlet by the second reset element, the first locking structure and the second locking structure release interference or cooperation, allowing the first valve core to open the return port with the water flow. The return port connects to the inlet port, realizing the circulation and heating of cold water. When cold water is used at the user end, when the second valve core opens the outlet with the water flow, the first locking structure and the second locking structure interfere or cooperate to limit the first valve core, locking it to close the return port. The inlet and outlet connect, allowing cold water in the cold water pipe to flow to the user end. When cold water is used at the user end, the return port is closed by the first valve core, preventing hot water from flowing into the cold water pipe, thus preventing the water heater from starting erroneously and meeting the water supply needs of the user end.

[0017] In one embodiment, the first locking structure includes a first shaft, the first valve core includes a first spindle, and the first spindle is provided at one end of the first spindle away from the return water port;

[0018] The second locking structure includes a rod body, the second valve core includes a second spindle, one end of the second spindle is provided with the rod body, and one end of the rod body is provided with an avoidance hole;

[0019] When the second valve core opens the outlet with the water flow, the first shaft interferes with and limits the rod body to lock the first valve core and close the return outlet.

[0020] When the second valve core closes the outlet, the first shaft is aligned with the clearance hole so that the first valve core can open the return port with the water flow.

[0021] In one embodiment, the first locking structure further includes a second shaft, one end of which is coaxially disposed with the second shaft, and the diameter of the second shaft is smaller than the diameter of the first shaft;

[0022] The rod body is also provided with a guide groove, which extends along the axial direction of the water outlet and communicates with the clearance hole; the width of the guide groove is smaller than the diameter of the clearance hole.

[0023] When the second valve core opens the outlet with the water flow, the second shaft slides into the guide groove through the clearance hole, and the outer periphery of the second shaft fits against the inner wall of the guide groove.

[0024] In one embodiment, the first locking structure includes a first shaft, the first valve core includes a first spindle, the first spindle is provided at one end away from the return water port, and the first spindle has a locking hole extending radially through it;

[0025] The second locking structure includes a rod body, the second valve core includes a second spindle, one end of the second spindle is provided with the rod body, and one end of the rod body is provided with a top block;

[0026] When the second valve core opens the outlet with the water flow, the top block slides into the lock hole and engages with the lock hole to lock the first valve core and close the return outlet;

[0027] When the second valve core closes the outlet, the top block moves and disengages from the lock hole so that the first valve core can open the return port with the water flow.

[0028] In one embodiment, the top of the top block is provided with an outwardly protruding arc surface, one end of which is connected to the rod body, and the other end of which extends to the bottom of the top block away from the rod body.

[0029] In one embodiment, the first mandrel is provided with a second piston that opens or closes the return water inlet;

[0030] The first reset element is a compression spring, which is sleeved on the first shaft and compressed between the second piston and the inner wall of the housing; or, the first reset element is a tension spring, which is installed between the second piston and the inner wall of the return port, with one end of the tension spring connected to the second piston.

[0031] In one embodiment, a support sleeve is provided inside the housing, and the outlet is provided at one axial end of the support sleeve;

[0032] The second spindle is provided with a first piston, which is disposed inside the support sleeve and configured to open the outlet with the water flow; or, to close the outlet under the drive of the second reset member.

[0033] In one embodiment, the support sleeve includes:

[0034] A receiving cylinder is disposed inside the housing. The receiving cylinder has a first water passage hole at its axial top end and a water outlet at its axial bottom end.

[0035] A support frame is connected to the top end of the receiving cylinder. The second reset member is sleeved on the support frame. One end of the second reset member abuts against the top end of the receiving cylinder, and the other end of the second reset member abuts against the first piston.

[0036] In one embodiment, the second reset member is a compression spring, which is installed between the inner wall of the support sleeve and the first piston; or, the second reset member is a tension spring, which is installed between the first piston and the inner wall of the housing, with one end of the tension spring connected to the first piston.

[0037] The second technical problem mentioned above is solved by the following technical solution:

[0038] A hot water system includes a water heater, an inlet pipe, a cold water pipe, a hot water pipe, a connecting pipe, and the aforementioned combination valve. The inlet pipe is connected to one end of the cold water pipe and the cold water inlet of the water heater. One end of the hot water pipe is connected to the hot water outlet of the water heater, and the other end of the hot water pipe is connected to the user. One end of the connecting pipe is connected to the hot water pipe, and the other end of the connecting pipe is connected to the return port of the combination valve. The other end of the cold water pipe is connected to the inlet of the combination valve, and the outlet of the combination valve is connected to the user.

[0039] The hot water system described in this utility model has the following advantages compared with the prior art:

[0040] When the combination valve is applied to the zero-cold-water function of a hot water system, when the second valve core is driven to close the outlet by the second reset element, the first locking structure and the second locking structure release interference or cooperation, allowing the first valve core to open the return port with the water flow. The return port connects to the inlet port, realizing the circulation and heating of cold water. When cold water is used at the user end, when the second valve core opens the outlet with the water flow, the first locking structure and the second locking structure interfere or cooperate to limit the first valve core, locking it to close the return port. The inlet and outlet connect, allowing cold water in the cold water pipe to flow to the user end. When cold water is used at the user end, the return port is closed by the first valve core, preventing hot water from flowing into the cold water pipe, thus preventing the water heater from starting erroneously and meeting the water supply needs of the user end. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the structural distribution of the hot water system provided in Embodiment 1 of this utility model;

[0042] Figure 2 This is a cross-sectional view of the internal structure of the combined valve provided in Embodiment 1 of this utility model;

[0043] Figure 3 This is a cross-sectional view of the combined valve with an open return port and a closed outlet provided in Embodiment 1 of this utility model;

[0044] Figure 4 This is a schematic diagram of the water ring structure provided in Embodiment 1 of this utility model;

[0045] Figure 5 This is a schematic diagram of the valve cover provided in Embodiment 1 of this utility model;

[0046] Figure 6 This is a schematic diagram of the structure of the first valve core provided in Embodiment 1 of this utility model;

[0047] Figure 7 This is a schematic diagram of the structure of the second valve core provided in Embodiment 1 of this utility model;

[0048] Figure 8 This is a cross-sectional view of the combined valve with a closed return port and an open outlet provided in Embodiment 1 of this utility model;

[0049] Figure 9 This is a schematic diagram of the support sleeve provided in Embodiment 1 of this utility model;

[0050] Figure 10 This is a cross-sectional view of the combined valve with an open return port and a closed outlet provided in Embodiment 2 of this utility model;

[0051] Figure 11 This is a schematic diagram of the structure of the second valve core provided in Embodiment 2 of this utility model;

[0052] Figure 12 This is a schematic diagram of the structure of the first valve core provided in Embodiment 2 of this utility model;

[0053] Figure 13 This is a schematic diagram of the valve cover provided in Embodiment 2 of this utility model;

[0054] Figure 14 This is a cross-sectional view of the combined valve with a closed return port and an open outlet provided in Embodiment 2 of this utility model.

[0055] The component names and labels in the diagram are as follows:

[0056] 10. Water heater; 101. Cold water inlet; 102. Hot water outlet; 103. Water pump; 20. Inlet pipe; 30. Cold water pipe; 40. Hot water pipe; 50. Connecting pipe; 60. Water outlet;

[0057] 1. Housing; 11. Valve seat; 111. Inlet; 112. Outlet; 113. Return port; 114. Mounting hole; 12. Valve cover; 13. Valve sleeve; 131. First positioning hole; 132. Second limiting hole;

[0058] 2. First valve core; 21. First spindle; 211. First shaft; 212. Second shaft; 213. Lock hole; 22. Second piston;

[0059] 3. Second valve core; 31. Second spindle; 311. First piston; 32. Rod body; 321. Clearance hole; 322. Guide groove; 323. Top block; 3230. Arc surface;

[0060] 4. Water ring; 41. Second positioning hole; 42. Second water passage hole;

[0061] 5. First reset component; 6. Second reset component; 7. Support sleeve; 71. Receiving cylinder; 711. First water passage hole; 72. Support frame; 721. First limiting hole. Detailed Implementation

[0062] To make the technical problem solved by this utility model, the technical solution adopted, and the technical effect achieved clearer, the technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are merely for explaining this utility model and not for limiting it. Furthermore, it should be noted that, for ease of description, only the parts related to this utility model are shown in the accompanying drawings, not all of them.

[0063] In the description of this utility model, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0064] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0065] In the description of this embodiment, the terms "upper," "lower," "right," and "left," etc., refer to the orientation or positional relationship shown in the accompanying drawings. They are used only for ease of description and simplification of operation, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are only used for distinction in description and have no special meaning.

[0066] The technical solution of this utility model will be further described below with reference to the accompanying drawings and specific embodiments.

[0067] Example 1

[0068] like Figure 1 As shown, this embodiment proposes a hot water system, which includes a water heater 10, an inlet pipe 20, a cold water pipe 30, a hot water pipe 40, and a connecting pipe 50. The inlet pipe 20 is connected to one end of the cold water pipe 30 and the cold water inlet 101 of the water heater 10. One end of the hot water pipe 40 is connected to the hot water outlet 102 of the water heater 10, and the other end of the hot water pipe 40 is connected to the water user 60. External pipes are connected to the inlet pipe 20 and the cold water pipe 30 to supply cold water to them. A water pump 103 is installed inside the water heater 10 to allow the cold water in the inlet pipe 20 to enter the water heater 10. After being heated by the water heater 10, the water flows through the hot water pipe 40 to the water user 60 to provide hot water at a specified temperature. The cold water in the external pipes can also supply cold water to the cold water pipe 30 to provide cold water to the water user 60. The water-using end 60 can be a bathroom faucet or shower head, etc. A mixing valve can also be installed at the water-using end 60. Hot water in the hot water pipe 40 and cold water in the cold water pipe 30 are mixed through the mixing valve before flowing to the water-using end 60. Since hot water systems are existing technology, the specific structure and working process of hot water systems will not be described in detail.

[0069] To achieve the zero-cold-water function of the hot water system, the system also includes a connecting pipe 50 and a combination valve. The combination valve connects the cold water pipe 30 and the hot water pipe 40 through the connecting pipe 50 to form a circulation pipeline. When the user activates the zero-cold-water function, the water pump 103 inside the water heater 10 is turned on, the combination valve is opened, and the hot water in the hot water pipe 40 flows back to the cold water pipe 30 through the combination valve. The water in the cold water pipe 30 is heated by the water heater 10 and then flows back to the hot water pipe 40, thus achieving circulation preheating.

[0070] In existing hot water systems, the combination valve is installed in the connecting pipe. When the user needs to use cold water, the hot water in the hot water pipe will flow out along with the cold water in the cold water pipe, causing the water heater to start erroneously and hot water to flow out of the cold water pipe.

[0071] To solve the above problems, such as Figure 2 and Figure 3 As shown in the figure, this embodiment also proposes a combined valve, which includes a housing 1, a first valve core 2, a first reset member 5, a second valve core 3, and a second reset member 6. The housing 1 has an inlet 111, an outlet 112, and a return outlet 113. The first valve core 2 is movably installed in the housing 1 along the axial direction (left-right direction in the figure) of the return outlet 113 to open the return outlet 113. The first valve core 2 is connected to a first locking structure. The first reset member 5 is disposed on the first valve core 2 and is used to drive the first valve core 2 to close the return outlet 113. The second valve core 3 is movably installed in the housing 1 along the axial direction (up-down direction in the figure) of the outlet 112 to open the outlet 112 with the water flow. The second valve core 3 is connected to a second locking structure. The second reset member 6 is disposed on the second valve core 3 and is used to drive the second valve core 3 to close the outlet 112. When the second valve core 3 opens the outlet 112 with the water flow, the first locking structure interferes with or cooperates with the second locking structure to limit the first valve core 2, so that the first valve core 2 locks and closes the return water port 113. When the second valve core 3 closes the outlet 112, the first locking structure and the second locking structure release interference or cooperation, so that the first valve core 2 can open the return water port 113 with the water flow.

[0072] When the combination valve is applied to the zero-cold-water function of a hot water system, the inlet pipe 20, water heater 10, hot water pipe 40, connecting pipe 50, combination valve, and cold water pipe 30 are sequentially connected to form a circulation pipeline. When the second valve core 3 is driven by the second reset member 6 to close the outlet 112, the first locking structure and the second locking structure are released from interference or cooperation, so that the first valve core 2 opens the return port 113 with the water flow. The return port 113 is connected to the inlet port 111, realizing the circulation and heating of cold water. When the water end 60 uses cold water, when the second valve core 3 opens the outlet 112 with the water flow, the first locking structure and the second locking structure interfere or cooperate to limit the first valve core 2, so that the first valve core 2 locks and closes the return port 113. The inlet port 111 is connected to the outlet port 112, so that the cold water in the cold water pipe 30 flows to the water end 60. When cold water is used at the water end 60, the return water port 113 is closed by the first valve core 2, which prevents hot water in the hot water pipe 40 from flowing into the cold water pipe 30, thereby preventing the water heater 10 from starting erroneously and meeting the water supply needs of the water end 60.

[0073] like Figures 3-5 As shown, the housing 1 includes a valve seat 11 and a valve cover 12. The valve seat 11 has an inlet 111, an outlet 112, a return port 113, and a mounting hole 114. The valve cover 12 is disposed within the mounting hole 114 and has a valve sleeve 13 extending into the valve seat 11. The combination valve also includes a water ring 4, which is installed in the return port 113. The water ring 4 has a second positioning hole 41 and a second water passage hole 42. The inner cavity of the valve seat 11 communicates with the return port 113 through the second water passage hole 42. The two ends of the first valve core 2 pass through the first positioning hole 131 and the second positioning hole 41, respectively. The first valve core 2 is movably installed in the valve seat 11 via the water ring 4 and the valve cover 12, so as to realize the left and right movement of the first valve core 2 along the axial direction of the return port 113, so as to switch between the open and closed positions of the return port 113.

[0074] Specifically, the mounting hole 114 of the valve seat 11 is coaxial with the return port 113 and is directly opposite to it in the left-right direction. The inlet 111 and the outlet 112 are coaxial with each other and are directly opposite to each other in the up-down direction. The circumferential outer edge of the water ring 4 is snapped onto the inner wall of the return port 113. A second positioning hole 41 and multiple second water passage holes 42 are opened at the center of the water ring 4, and the multiple second water passage holes 42 are distributed circumferentially along the water ring 4. The valve cover 12 is sealed and installed in the mounting hole 114 to ensure the sealing performance of the housing 1. A valve sleeve 13 is integrally provided on one side of the valve cover 12. One end of the second valve core 3 extends into the valve sleeve 13 and locks or unlocks with the first valve core 2. The water ring 4 is installed in the return port 113 to support the left end of the first valve core 2, and the valve seat 11 is installed in the mounting hole 114 to support the right end of the first valve core 2 through the valve sleeve 13. When the first valve core 2 opens the return port 113 under the action of the water flow, the return port 113 is connected to the inlet port 111 through the second water passage 42.

[0075] like Figures 6-8 As shown, the first locking structure includes a first shaft 211, and the first valve core 2 includes a first spindle 21, with the first spindle 21 having a first shaft 211 at one end away from the return port 113. The second locking structure includes a rod 32, and the second valve core 3 includes a second spindle 31, with the rod 32 at one end of the second spindle 31, and a clearance hole 321 at one end of the rod 32. When the second valve core 3 opens the outlet 112 with the water flow, the first shaft 211 and the rod 32 interfere and limit the movement, causing the first valve core 2 to lock and close the return port 113. When the second valve core 3 closes the outlet 112, the first shaft 211 is aligned with the clearance hole 321, allowing the first valve core 2 to open the return port 113 with the water flow. Figure 8 As shown, when the second spindle 31 opens the outlet 112 with the water flow, the second spindle 31 drives the rod 32 to move upward along the axial direction of the outlet 112. The right end of the first shaft 211 slides out from the clearance hole 321 and abuts against the rod 32, so that the rod 32 can achieve one-way limiting of the first valve core 2, restricting the first valve core 2 from moving to the right along the axial direction of the return water port 113 to open the return water port 113. When the second spindle 31 closes the outlet 112, the first valve core 2 can move to the right along the axial direction of the return water port 113 with the water flow to open the return water port 113. At this time, the first shaft 211 passes through the opposite clearance hole 321, and at the same time locks the second valve core 3, preventing the second valve core 3 from opening the outlet 112.

[0076] In one embodiment, the first locking structure further includes a second shaft 212, which is coaxially disposed at one end of the first shaft 211. The diameter of the second shaft 212 is smaller than that of the first shaft 211. The rod body 32 also has a guide groove 322, which extends axially along the outlet 112 and communicates with the clearance hole 321. The width of the guide groove 322 is smaller than the diameter of the clearance hole 321. When the second valve core 3 opens the outlet 112 with the water flow, the second shaft 212 slides into the guide groove 322 through the clearance hole 321, and the outer periphery of the second shaft 212 fits against the inner wall of the guide groove 322. When the second spindle 31 opens the outlet 112 under the action of water flow inside the housing 1, the second spindle 31 drives the rod 32 to move upward along the axial direction of the outlet 112. At this time, the second shaft 212 slides into the guide groove 322 through the clearance hole 321, and the outer periphery of the second shaft 212 fits against the inner wall of the guide groove 322. The first shaft 211 and the second shaft 212 are connected in a stepped shaft structure, so that when the first shaft 211 is coaxially inserted through the clearance hole 321, the second shaft 212 passes through the clearance hole 321. When cold water is needed at the water end 60, the first shaft 211 slides out of the clearance hole 321, and the second spindle 31 opens the water outlet 112 from bottom to top along the axial direction of the water outlet 112. The second shaft 212 slides relative to the guide groove 322, and the outer circumference of the second shaft 212 is in contact with the inner wall of the guide groove 322 so that the second shaft 212 and the rod 32 are in contact. This further limits the up-and-down movement of the rod 32 along the axial direction of the water outlet 112, and prevents the rod 32 from shifting or shaking in the valve sleeve 13.

[0077] like Figure 3 , Figure 6 and Figure 8As shown, the first spindle 21 is equipped with a second piston 22 that opens or closes the return port 113. The first reset element 5 is a compression spring, which is sleeved on the first spindle 211 and compressed between the second piston 22 and the inner wall of the housing 1. In one embodiment, the second piston 22 is a sealing gasket to seal the return port 113. The second piston 22 is sleeved on the first spindle 21, and a locking nut and a flange are threaded onto the first spindle 21. The second piston 22 is clamped between the locking nut and the flange to achieve a stable installation of the second piston 22 on the first spindle 21. The first reset element 5 is a compression spring, which has a simple structure and is easy to install. The compression spring is sleeved on the first spindle 21, with one end of the compression spring pressing against the flange and the other end of the compression spring pressing against the end of the valve sleeve 13 away from the valve cover 12, so that the compression spring is compressed and installed between the second piston 22 and the valve sleeve 13, thereby giving the second piston 22 a tendency to close the return port 113. When the hot water system activates the zero cold water function, the water pressure of the hot water in the hot water pipe 40 is greater than the elastic restoring force of the first reset member 5, so as to drive the first spindle 21 to move along the axial direction of the return port 113 toward the valve cover 12, causing the second piston 22 to open the return port 113.

[0078] In another embodiment, the first reset member 5 can also be a tension spring. The tension spring is stretched and installed between the second piston 22 and the inner wall of the return port 113. One end of the tension spring is connected to the second piston 22, which also enables the second piston 22 to always have the tendency to close the return port 113.

[0079] like Figure 3 , Figure 7 and Figure 8 As shown, a support sleeve 7 is provided inside the housing 1, and a water outlet 112 is opened at one axial end of the support sleeve 7. A first piston 311 is provided on the second spindle 31. The first piston 311 is located inside the support sleeve 7 and is configured to open the water outlet 112 with the water flow; or, the first piston 311 is closed by the drive of the second reset member 6. In this embodiment, the first piston 311 is a sealing gasket to seal the water outlet 112. When the hot water system is activated with the zero cold water function, the water pump 103 is turned on, the first piston 311 closes the water outlet 112 under the action of the second reset member 6, and the first valve core 2 opens the return water outlet 113 under the action of the water flow. The hot water in the hot water pipe 40 is circulated and heated in the water heater 10 to realize the zero cold water function of the hot water system. When cold water is used at the water end 60, the second piston 22 closes the return water port 113 under the action of the first reset member 5. The cold water in the cold water pipe 30 enters the housing 1 through the water inlet 111 and pushes the first piston 311 from bottom to top along the axial direction of the water outlet 112, so that the cold water flows to the water end 60 through the water outlet 112 and the first water passage hole 711.

[0080] In this embodiment, the support sleeve 7 includes a receiving cylinder 71 and a support frame 72. The receiving cylinder 71 is disposed inside the housing 1. A first water passage hole 711 is opened at the top axial direction of the receiving cylinder 71, and a water outlet 112 is opened at the bottom axial direction of the receiving cylinder 71. The support frame 72 is connected to the top of the receiving cylinder 71. A second reset member 6 is sleeved on the support frame 72. One end of the second reset member 6 abuts against the top of the receiving cylinder 71, and the other end of the second reset member 6 abuts against the first piston 311. Specifically, the top edge of the receiving cylinder 71 extends outward and is provided with an overlap. The inner wall of the housing 1 is provided with a stepped surface. The receiving cylinder 71 is snapped onto the inner wall of the housing 1, and the overlap of the receiving cylinder 71 overlaps the stepped surface of the inner wall of the housing 1 to achieve a sealed installation of the receiving cylinder 71 inside the housing 1. The accommodating cylinder 71 has multiple first water passage holes 711 at one axial end, and the second spindle 31 passes through the first limiting hole 721 along the axial direction of the outlet 112. Multiple second water passage holes 42 are distributed circumferentially along the first limiting hole 721. When the first piston 311 opens the outlet 112 under the action of water flow within the housing 1, the inlet 111, outlet 112, and first water passage holes 711 are sequentially connected. The first limiting hole 721 guides and limits the movement of the second spindle 31 along the axial direction of the outlet 112, allowing the first piston 311 to open or close the outlet 112.

[0081] In one embodiment, the second reset element 6 is a compression spring, which is installed between the inner wall of the support sleeve 7 and the first piston 311. The second reset element 6 is a compression spring, which has a simple structure and is easy to install. A support frame 72 is provided inwardly on the inner top wall of the support sleeve 7. The compression spring is sleeved on the support frame 72 to achieve a stable installation of the compression spring within the support sleeve 7. One end of the compression spring abuts against the inner wall of the support sleeve 7, and the other end abuts against the first piston 311, so that the compression spring is compressed and installed between the support sleeve 7 and the first piston 311, thereby ensuring that the first piston 311 always tends to close the outlet 112.

[0082] In another embodiment, the second reset member 6 can also be a tension spring, which can be installed between the first piston 311 and the inner wall of the housing 1, and one end of the tension spring is connected to the first piston 311, which can also make the first piston 311 always tend to close the water outlet 112.

[0083] For ease of understanding, the working process of the combined valve in this embodiment is as follows:

[0084] like Figure 3As shown, the second valve core 3 is driven by the second reset member 6 to close the outlet 112. The first shaft 211 is aligned with the clearance hole 321 so that the first valve core 2 can open the return port 113 with the water flow. When the hot water system is in zero cold water mode, the water pump 103 is turned on. The water pressure of the hot water in the hot water pipe 40 is greater than the elastic restoring force of the first reset member 5, which drives the first spindle 21 to move to the right along the axial direction of the return port 113, so that the second piston 22 opens the return port 113. At this time, the hot water in the hot water pipe 40 circulates and is heated in the water heater 10. When the hot water system is not in zero cold water mode, the water pump 103 remains off. Under the action of the elastic restoring force of the first reset member 5, the first spindle 21 always tends to move to the left along the axial direction of the return port 113, so that the second piston 22 closes the return port 113.

[0085] like Figure 8 As shown, when the water terminal 60 needs to use cold water, the water pump 103 remains closed. Under the elastic restoring force of the first reset member 5, the first spindle 21 moves to the left along the axial direction of the return port 113 and slides out of the clearance hole 321. While the second piston 22 closes the return port 113, the first shaft 211 does not restrict the rod 32 from moving up and down along the axial direction of the outlet 112. Cold water in the cold water pipe 30 enters the housing 1. At this time, the water pressure of the cold water in the cold water pipe 30 is greater than the elastic restoring force of the second reset member 6, so that the first piston 311 is pushed open from bottom to top, causing the first piston 311 to open the outlet 112. At the same time, the rod 32 restricts the first valve core 2 from moving to the right along the axial direction of the return port 113, thereby locking the first valve core 2 and keeping the first valve core 2 in the closed state of the return port 113. The cold water flows to the water terminal 60 after passing through the outlet 112 and the first water passage hole 711, ensuring normal water use for the user.

[0086] Example 2

[0087] like Figure 10 As shown, this embodiment proposes a combined valve. The structure of the combined valve is basically the same as that of Embodiment 1. The main difference between the combined valve of this embodiment and Embodiment 1 is that the structure of the rod 32 of the second valve core 3 is different from that of the first valve core 2.

[0088] like Figures 10-12As shown, the first locking structure includes a first shaft 211, and the first valve core 2 includes a first spindle 21. The first spindle 21 has a first shaft 211 at one end away from the return water port 113, and a locking hole 213 is radially provided through the first shaft 211. The second locking structure includes a rod 32, and the second valve core 3 includes a second spindle 31. The rod 32 is provided at one end of the second spindle 31, and a top block 323 is provided at one end of the rod 32. When the second valve core 3 opens the outlet 112 with the water flow, the top block 323 slides into the locking hole 213 and engages with the locking hole 213 to lock the first valve core 2 and close the return water port 113. When the second valve core 3 closes the outlet 112, the top block 323 moves and disengages from the locking hole 213, allowing the first valve core 2 to open the return water port 113 with the water flow. The top block 323 cooperates with the lock hole 213, so that the top block 323 can restrict the first spindle 21 from moving left and right along the axial direction of the return port 113, thereby locking the first valve core 2, and the second piston 22 always closes the return port 113.

[0089] In one embodiment, the top of the top block 323 is provided with an outwardly protruding arc surface 3230. One end of the arc surface 3230 is connected to the rod 32, and the other end of the arc surface 3230 extends to the bottom of the top block 323 away from the rod 32. Through the above arrangement, the top block 323 is approximately a quarter-circle plate structure, and the arc surface 3230 of the top block 323 has a certain guiding function. The first piston 311 opens the outlet 112 with the water flow, and the top block 323 moves from bottom to top with the rod 32 and extends into the lock hole 213. The bottom of the inner wall of the lock hole 213 may come into contact with the arc surface 3230 and slide relative to it, so that the top block 323 will not get stuck when it moves from bottom to top with the rod 32, thus improving the reliability of the second valve core 3.

[0090] like Figure 13 As shown, the valve sleeve 13 has a second limiting hole 132 extending radially through it. One end of the rod 32 passes through the second limiting hole 132 and engages with the first shaft 211 to limit the first valve core 2 in the left-right direction. By setting the second limiting hole 132, the axial movement of the rod 32 along the outlet 112 is further guided and limited, preventing the rod 32 from shifting position within the valve sleeve 13, and further improving the stability and reliability of the engagement between the rod 32 and the first valve core 2.

[0091] like Figure 10As shown, the top block 323 protrudes through the lock hole 213. Under the action of the second reset member 6, the first piston 311 closes the outlet 112, and the second spindle 31 releases the restriction on the first spindle 21, allowing the first spindle 21 to open or close the return port 113 with the water flow. When the hot water system is in zero-cold-water mode, the water pump 103 is turned on, and the water pressure of the hot water in the hot water pipe 40 is greater than the elastic restoring force of the first reset member 5, driving the first spindle 21 to move to the right along the axial direction of the return port 113, causing the second piston 22 to open the return port 113. At this time, the hot water in the hot water pipe 40 circulates and is heated in the water heater 10. When the hot water system is not in zero-cold-water mode, the water pump 103 remains off. Under the action of the elastic restoring force of the first reset member 5, the first spindle 21 always tends to move to the left along the axial direction of the return port 113, causing the second piston 22 to close the return port 113.

[0092] like Figure 14 As shown, when the water terminal 60 needs to use cold water, the water pump 103 remains closed. Under the elastic restoring force of the first reset member 5, the first spindle 21 moves to the left along the axial direction of the return port 113. While the second piston 22 closes the return port 113, the first shaft 211 does not restrict the rod 32 from moving up and down along the axial direction of the outlet 112. Cold water in the cold water pipe 30 enters the housing 1. At this time, the water pressure of the cold water in the cold water pipe 30 is greater than the elastic restoring force of the second reset member 6, so that the first piston 311 is pushed open from bottom to top, causing the first piston 311 to open the outlet 112. At the same time, the top block 323 slides into the locking hole 213 and abuts against the inner wall of the locking hole 213, so that the rod 32 restricts the first valve core 2 from moving to the right along the axial direction of the return port 113, thereby locking the first valve core 2 and keeping the first valve core 2 in the closed state of the return port 113. After passing through the outlet 112 and the first water passage 711, the cold water finally flows to the water-using end 60, ensuring normal water use for users.

[0093] The above embodiments merely illustrate the basic principles and characteristics of this utility model. This utility model is not limited to the above embodiments. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. Combination valve, characterized in that include: The housing (1) is provided with an inlet (111), an outlet (112) and a return outlet (113); The first valve core (2) is movably installed in the housing (1) along the axial direction of the return water port (113) to open the return water port (113); the first valve core (2) is connected to a first locking structure; A first reset element (5) is disposed on the first valve core (2) and is used to drive the first valve core (2) to close the return water port (113); The second valve core (3) is movably installed in the housing (1) along the axial direction of the outlet (112) to open the outlet (112) with the water flow; the second valve core (3) is connected to a second locking structure; The second reset member (6) is disposed on the second valve core (3) and is used to drive the second valve core (3) to close the outlet (112); When the second valve core (3) opens the outlet (112) with the water flow, the first locking structure interferes with or cooperates with the second locking structure to limit the first valve core (2) so that the first valve core (2) locks and closes the return water port (113); When the second valve core (3) closes the outlet (112), the first locking structure and the second locking structure are released from interference or cooperation, so that the first valve core (2) can open the return port (113) with the water flow.

2. The combination valve of claim 1, wherein The first locking structure includes a first shaft (211), the first valve core (2) includes a first spindle (21), and the first spindle (21) is provided at one end away from the return water port (113); The second locking structure includes a rod (32), the second valve core (3) includes a second spindle (31), one end of the second spindle (31) is provided with the rod (32), and one end of the rod (32) is provided with an avoidance hole (321); When the second valve core (3) opens the outlet (112) with the water flow, the first shaft (211) and the rod (32) interfere with and limit each other so that the first valve core (2) locks and closes the return outlet (113); When the second valve core (3) closes the outlet (112), the first shaft (211) is aligned with the clearance hole (321) so that the first valve core (2) can open the return port (113) with the water flow.

3. The combination valve of claim 2, wherein, The first locking structure further includes a second shaft (212), one end of which is coaxially provided with the second shaft (212), and the diameter of the second shaft (212) is smaller than the diameter of the first shaft (211); The rod body (32) is also provided with a guide groove (322), which extends along the axial direction of the water outlet (112) and communicates with the clearance hole (321); the width of the guide groove (322) is smaller than the diameter of the clearance hole (321); When the second valve core (3) opens the outlet (112) with the water flow, the second shaft (212) slides into the guide groove (322) through the clearance hole (321), and the outer periphery of the second shaft (212) fits against the inner wall of the guide groove (322).

4. The combination valve of claim 1, wherein The first locking structure includes a first shaft (211), the first valve core (2) includes a first spindle (21), the first spindle (21) is provided at one end away from the return water port (113), and the first shaft (211) is provided with a locking hole (213) through it in the radial direction; The second locking structure includes a rod (32), the second valve core (3) includes a second spindle (31), one end of the second spindle (31) is provided with the rod (32), and one end of the rod (32) is provided with a top block (323); When the second valve core (3) opens the outlet (112) with the water flow, the top block (323) slides into the lock hole (213) and cooperates with the lock hole (213) to lock and close the return water port (113); When the second valve core (3) closes the outlet (112), the top block (323) moves and disengages from the lock hole (213) so that the first valve core (2) can open the return port (113) with the water flow.

5. The combination valve of claim 4, wherein, The top of the top block (323) is provided with an outwardly protruding arc surface (3230), one end of which is connected to the rod (32), and the other end of which extends to the bottom of the top block (323) away from the rod (32).

6. The combination valve of claim 2 or 4, wherein The first mandrel (21) is provided with a second piston (22) to open or close the return water port (113); The first reset component (5) is a compression spring, which is sleeved on the first shaft (211) and installed between the second piston (22) and the inner wall of the housing (1); or, the first reset component (5) is a tension spring, which is installed between the second piston (22) and the inner wall of the return port (113), and one end of the tension spring is connected to the second piston (22).

7. The combination valve of claim 2 or 4, wherein A support sleeve (7) is provided inside the housing (1), and the water outlet (112) is opened at one end of the support sleeve (7) in the axial direction; The second spindle (31) is provided with a first piston (311), which is disposed inside the support sleeve (7) and configured to open the outlet (112) with the water flow; or, the outlet (112) is closed under the drive of the second reset member (6).

8. The combination valve of claim 7, wherein, The support sleeve (7) includes: A container (71) is disposed inside the housing (1). The container (71) has a first water passage hole (711) at its axial top end and a water outlet (112) at its axial bottom end. The support frame (72) is connected to the top end of the accommodating cylinder (71). The second reset member (6) is sleeved on the support frame (72). One end of the second reset member (6) abuts against the top end of the accommodating cylinder (71), and the other end of the second reset member (6) abuts against the first piston (311).

9. The combination valve of claim 7, wherein, The second reset member (6) is a compression spring, which is installed between the inner wall of the support sleeve (7) and the first piston (311); or, the second reset member (6) is a tension spring, which is installed between the first piston (311) and the inner wall of the housing (1), and one end of the tension spring is connected to the first piston (311).

10. A hot water system, characterized in that, The device includes a water heater (10), an inlet pipe (20), a cold water pipe (30), a hot water pipe (40), a connecting pipe (50), and a combination valve according to any one of claims 1 to 9. The inlet pipe (20) is connected to one end of the cold water pipe (30) and the cold water inlet (101) of the water heater (10). One end of the hot water pipe (40) is connected to the hot water outlet (102) of the water heater (10), and the other end of the hot water pipe (40) is connected to the water outlet (60). One end of the connecting pipe (50) is connected to the hot water pipe (40), and the other end of the connecting pipe (50) is connected to the return port (113) of the combination valve. The other end of the cold water pipe (30) is connected to the inlet (111) of the combination valve, and the outlet (112) of the combination valve is connected to the water outlet (60).

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