Efficient return valve and water circulation system applying same

Abstract

An efficient return valve comprises a tubular valve body, and the valve body comprises a hot water conveying pipe and a cold water conveying pipe. The device further comprises a partition wall, and a backflow through hole is formed in the partition wall. The temperature sensing elastic piece can be switched between a contraction state and an extension state according to the water temperature in the conveying pipeline, when the temperature of the temperature sensing elastic piece is lower than the deformation temperature, the temperature sensing elastic piece is in the contraction state, the temperature sensing elastic piece is separated from the sealing plug, and the sealing plug is in the extension state. The compression spring can drive the sealing plug to close the backflow through hole, and at the moment, water in the hot water conveying pipe can push away the sealing plug to flow to the cold water conveying pipe through the backflow through hole. When the temperature of the temperature sensing elastic piece is higher than the deformation temperature, the temperature sensing elastic piece is in an extension state, the temperature sensing elastic piece and the compression spring drive the sealing plug to close the backflow through hole together, and water in the hot water conveying pipe is prevented from flowing to the cold water conveying pipe through the backflow through hole.

Description

Technical Field

[0001] The present invention relates to the technical field of sanitary products, and particularly relates to an efficient reflux valve and a water circulation system to which the same is applied. Background Art

[0002] In our daily life, the water supply system of water heaters is a choice for many families. By installing a set of water heaters, hot water can be provided for multiple rooms, which is very convenient. However, in actual applications, since the hot water pipes are very long and some are exposed to the external environment for a long time, if not used for a period of time, the hot water in the hot water pipes will become cold. If hot water is needed at this time, the faucet needs to be opened and the cold hot water in the hot water pipes needs to be drained first. During the process of draining the cold water, since the arrival time of the hot water is unknown, generally, one needs to constantly feel it with hands, or drain some hot water as well. This method wastes water resources on the one hand and wastes energy on the other hand.

[0003] To solve the above problems, people have invented a zero - cold - water water supply system. For example, the Chinese invention patent with the publication number CN109563936B discloses a hot water recirculation system. The hot water sink heats the direct water supply flowing in through the direct water supply inflow pipe to generate hot water. The recirculation pump pumps the hot water passing through the hot water discharge pipe to make it recirculate. The hot water supply pipe is connected to the outlet of the recirculation pump and then supplies hot water to the faucet. The direct water supply pipe is connected to the direct water supply pipe and then supplies direct water to the faucet. It also includes a hot water recirculation valve disposed between the hot water supply pipe and the direct water supply pipe. The hot water recirculation valve includes a housing and a pressure receiving plate. A recirculation flow path is provided in the housing. When the hot water is recirculated, the pressure receiving plate is pushed open by the hot water by means of the pressure of the recirculated hot water, and the hot water flows back to the hot water sink through the direct water supply inflow pipe. However, this kind of hot water recirculation system generally controls the working duration of the recirculation pump to achieve the duration of the circulating heating of the water. In order to ensure that the hot water can flow to the hot water recirculation valve, a relatively long circulating heating duration is generally set, which means that too much water in the water circuit is heated, and some useless heating will cause energy waste.

[0004] In order to further improve the energy utilization rate, people have improved the hot water recirculation system. For example, a Chinese invention patent with the publication number CN112283947A discloses a zero - cold - water water supply system, which includes a circulation pump, a hot water pipe, a cold water pipe, and an H - valve that form a circulation water path. The H - valve connects the hot water pipe and the cold water pipe. It also includes a temperature detector and a controller. The temperature detector is arranged at the water outlet end of the hot water pipe. The temperature detector is used to detect the water temperature at the water outlet end of the hot water pipe. The controller is used to control the operation of the temperature detector and the circulation pump when receiving a zero - cold - water control instruction. The temperature detector includes a temperature probe and a control board. One end of the temperature probe is inserted into the H - valve and the other end is connected to the signal end of the control board. The control board is signal - connected to the controller and controls the circulation pump and the temperature detector to stop working when the water temperature is higher than the preset water temperature. This new water supply system can stop heating in time, only need to heat half a pipe of water, and reduce energy waste. However, in this improved hot water recirculation system, since it is necessary to add electrical connectors such as a temperature probe and a control board to the H - valve, on the one hand, the structure of the valve body becomes more complex and the manufacturing cost increases. On the other hand, because the installation position of the H - valve is far from the water heater, the signal connection is easily interfered with and unstable. Summary of the Invention

[0005] In order to overcome at least one of the problems existing in the prior art, such as complex structure, unstable signal connection, and high manufacturing cost, the present invention proposes an efficient reflux valve, which includes a tubular valve body. The valve body includes a connected hot water delivery pipe and a cold water delivery pipe. A partition wall is provided at the connection of the hot water delivery pipe and the cold water delivery pipe, and a return flow hole communicating the hot water delivery pipe and the cold water delivery pipe is provided on the partition wall. It also includes a temperature - sensitive elastic member and a sealing plug arranged in the valve body. The sealing plug is arranged in the cold water delivery pipe. The temperature - sensitive elastic member can switch between a contracted state and an extended state according to the water temperature in the delivery pipe. It also includes a compression spring, which is arranged in the valve body and arranged in the same direction as the temperature - sensitive elastic member. When the temperature of the temperature - sensitive elastic member is lower than the deformation temperature, it is in a contracted state, the temperature - sensitive elastic member is separated from the sealing plug, and the compression spring can drive the sealing plug to close the return flow hole. However, at this time, the water in the hot water delivery pipe can push open the sealing plug and flow through the return flow hole to the cold water delivery pipe. When the temperature of the temperature - sensitive elastic member is higher than the deformation temperature, it is in an extended state, and the temperature - sensitive elastic member and the compression spring together drive the sealing plug to close the return flow hole, thereby preventing the water in the hot water delivery pipe from flowing through the return flow hole to the cold water delivery pipe.

[0006] Among them, the valve body is a water delivery component used to connect a hot water pipe, a cold water pipe, and a water-using terminal (such as a faucet). Its structure can be diverse. In one implementation, the valve body is an integrally formed tubular component, and the hot water delivery pipe and the cold water delivery pipe are two parts of the pipe body. In another implementation, the hot water delivery pipe and the cold water delivery pipe are two independent pipe bodies that are detachably connected together.

[0007] Among them, the hot water delivery pipe has a hollow structure, including a hot water inlet and a hot water outlet. The hot water inlet is arranged at the free end on the side far from the cold water delivery pipe, and the hot water outlet is arranged on the side wall of the hot water delivery pipe near one end of the partition wall. The axes of the hot water inlet and the hot water outlet are perpendicularly arranged. The cold water delivery pipe is coaxially arranged with the hot water delivery pipe. Similarly, the cold water delivery pipe also has a hollow structure, including a cold water inlet and a cold water outlet. The cold water outlet is arranged on the side wall of the cold water delivery pipe, and the axes of the cold water inlet and the cold water outlet are perpendicularly arranged.

[0008] Among them, the sealing plug is a sealing component movably arranged in the cold water delivery pipe and is made of a soft material, such as silicone rubber or plastic.

[0009] Among them, the compression spring is a helical elastic component with a fixed elastic coefficient, and its elastic force is proportional to the length of extrusion and contraction. The compression spring is generally made of a metal material. In the technical solution of the present invention, the compression spring can continuously apply a force to the sealing plug to close the return through hole, but the closing force of the compression spring is less than the opening force applied to the sealing plug by the circulating water pump during the operation of the system. When the positive pressure difference formed by the water in the pipe in the opening direction of the sealing plug reaches 0.02 Mpa - 0.05 Mpa, the closing force of the compression spring can be overcome, and the sealing plug can be opened, so that the water in the hot water delivery pipe can flow through the return through hole to the cold water delivery pipe.

[0010] Among them, the temperature-sensitive elastic member is an elastic component that can change according to different temperatures. For example, the component shortens at low temperatures and elongates when the temperature rises, and this telescopic change is repeatable. In one embodiment, the temperature-sensitive elastic member is in the shape of a helical spring and is made of a shape memory alloy. The thermal deformation temperature of the temperature-sensitive elastic member is 20°C to 40°C. It should be noted that whether the temperature-sensitive elastic member is in the extended state or the contracted state, as long as there is a deformation gap between its coils, the temperature-sensitive elastic member has the ability of elastic deformation, that is, it can apply pressure to other objects through elastic deformation. However, the elastic coefficient of the temperature-sensitive elastic member is set higher than that of the compression spring. When the temperature-sensitive elastic member is in the extended state, it can apply a greater closing force to the sealing plug than the compression spring. In order to ensure the rapid return of cold water, the temperature-sensitive elastic member is separated from the sealing plug in the contracted state, which reduces the closing force received by the sealing plug and provides space for the movement of the sealing plug.

[0011] According to the above technical solution, compared with the prior art, the beneficial technical effects of the present invention are as follows: First, by arranging the temperature-sensitive elastic member and the compression spring in the valve body at the same time, not only can the compression spring continuously apply a closing force to the sealing plug, so that the sealing plug blocks the return through-hole in a state where the left and right pressures are basically balanced, which well reduces the problem of cold and hot water cross-flow between the conveying pipes, and the cold water flowing back when the circulating water pump starts can also open the sealing plug within the set pressure range to achieve cold water return; when hot water flows through the temperature-sensitive elastic member, the temperature-sensitive elastic member can switch to the extended state. Under the combined action of the temperature-sensitive elastic member and the compression spring, the sealing plug is pressed tightly against the partition wall, and the pressure of the circulating water pump cannot push open the sealing plug, and the hot water cannot pass through the return through-hole. The flowmeter detects that the water flow rate becomes smaller, and the water heater and the circulating water pump stop working. It can be seen that this technical solution does not require a control board and a temperature probe to be installed on the valve body, nor does it need to be signal-connected to the water heater. The structure of the valve body is simple and reliable, and there is no problem of signal interference; Second, the temperature-sensitive elastic member is arranged in the pipeline of the valve body and is in direct contact with water, and the response speed is very fast, which not only ensures that hot water flows into the valve body, but also can reduce too much hot water flowing into the cold water conveying pipe, that is, reduce ineffective heating and achieve energy conservation; Third, the sealing plug is arranged in the cold water pipe. When using hot water alone, the pressure at the cold water conveying pipe end will be slightly greater than the pressure at the hot water conveying pipe end. At this time, the sealing plug can be closed by relying on the water pressure to block the return through-hole, which well reduces the problem of cold water cross-flow.

[0012] Due to the above advantages of the high-efficiency reflux valve, it can be applied to a water circulation system. The water circulation system includes a cold water source, a three-way valve, a heating device, a circulation pump, and a high-efficiency reflux valve connected together through a water delivery pipeline. Among them, the cold water source is respectively connected to the water inlet end of the heating device and the cold water delivery pipe of the high-efficiency reflux valve through the three-way valve. The water outlet end of the heating device is connected to the hot water delivery pipe of the high-efficiency reflux valve. The circulation pump is arranged upstream or downstream of the heating device, and the circulation pump can make the hot water in the heating device flow through the water delivery pipeline to the high-efficiency reflux valve; the cold water in the water delivery pipeline can push open the sealing plug and flow back to the heating device through the return through hole; when the hot water in the water delivery pipeline flows to the position of the temperature-sensitive elastic member, and the temperature of the temperature-sensitive elastic member is higher than the deformation temperature, it switches to the extended state, and the temperature-sensitive elastic member drives the sealing plug to close the return through hole to prevent the hot water from flowing back to the delivery pipe; it also includes a controller and a flow sensor signal-connected to the controller. The flow sensor is used to detect the water flow in the water delivery pipeline. When the flow sensor detects that the water flow in the water delivery pipeline drops to a set value, it can send a stop signal to the controller. After receiving the stop signal sent by the flow sensor, the controller can control the circulation pump and the heating device to stop working.

[0013] Due to the above characteristics and advantages of the present invention, it can be applied to a high-efficiency reflux valve and the water circulation system to which it is applied. Brief Description of the Drawings

[0014] Figure 1 is a schematic diagram of a water circulation system applying the high-efficiency reflux valve; Figure 2 is a schematic diagram of the structure of the high-efficiency reflux valve in the axial direction; Figure 3 is an exploded view of the high-efficiency reflux valve; Figure 4 is a cross-sectional view of the high-efficiency reflux valve, showing the temperature-sensitive elastic member in the extended state; Figure 5 is a cross-sectional view of the high-efficiency reflux valve, showing the temperature-sensitive elastic member in the contracted state; Figure 6 is a cross-sectional view of the high-efficiency reflux valve, showing the sealing plug in the open state. Detailed Description of the Invention

[0015] The structure of the high-efficiency return valve 2 applying the technical solution of the present invention and the water circulation system to which it is applied will be further described below in conjunction with the accompanying drawings. Except for those clearly stated as equivalent or alternative embodiments, the various implementation details disclosed below can be selectively applied or combined and applied in one embodiment even if there is no direct association or synergy in terms of function.

[0016] As Figure 1 shown in the schematic diagram of the water circulation system, the water circulation system includes a cold water source 10, a three-way valve 11, a heating device 12 (i.e., a water heater), a circulation pump 13, and a high-efficiency return valve 2 connected together through a water delivery pipe. Among them, the water delivery pipe can be divided into a hot water pipe 14 and a cold water pipe 15 according to the connection position and the temperature of the water being transported. For example, the cold water source 10 is respectively connected to the water inlet end of the heating device 12 and the cold water delivery pipe 31 of the high-efficiency return valve 2 through the three-way valve 11. The pipes connecting the cold water source 10, the three-way valve 11, and the high-efficiency return valve 2 are cold water pipes 15, and part of the cold water pipes 15 are used as return pipes; the water outlet end of the heating device 12 and the hot water delivery pipe 32 of the high-efficiency return valve 2 are connected through the hot water pipe 14. The circulation pump 13 is arranged upstream or downstream of the heating device 12. The circulation pump 13 drives the water in the pipe to flow, so that the hot water in the heating device 12 flows through the hot water pipe 14 to the high-efficiency return valve 2, and the cold water in the hot water pipe 14 can open the high-efficiency return valve 2 and then flow back to the heating device 12 along the cold water pipe 15. Further, in order to prevent the returned water from flowing to the cold water source 10, a one-way check valve is also provided between the cold water source 10 and the three-way valve 11.

[0017] The following in conjunction with Figures 2 to 6A detailed description of the high-efficiency reflux valve 2 is given. The high-efficiency reflux valve 2 includes a tubular valve body 3, and the valve body 3 includes a hot water delivery pipe 32 and a cold water delivery pipe 31 which are connected to each other; a partition wall 4 is provided at the connection of the hot water delivery pipe 32 and the cold water delivery pipe 31, and a return flow hole 40 communicating the hot water delivery pipe 32 and the cold water delivery pipe 31 is provided on the partition wall 4; further included are a temperature-sensitive elastic member 5 and a sealing plug 6 disposed within the valve body 3, the sealing plug 6 is disposed within the cold water delivery pipe 31, the temperature-sensitive elastic member 5 can switch between a contracted state and an extended state according to the water temperature in the delivery pipeline, and a compression spring 7 is further included, the compression spring 7 is disposed within the valve body 3 and is arranged in the same direction as the temperature-sensitive elastic member 5; when the temperature of the temperature-sensitive elastic member 5 is lower than the deformation temperature, it is in a contracted state, the temperature-sensitive elastic member 5 is separated from the sealing plug 6, and the compression spring 7 can drive the sealing plug 6 to close the return flow hole 40, but at this time the water in the hot water delivery pipe 32 can push open the sealing plug 6 and thus flow through the return flow hole 40 to the cold water delivery pipe 31; when the temperature of the temperature-sensitive elastic member 5 is higher than the deformation temperature, it is in an extended state, the temperature-sensitive elastic member 5 and the compression spring 7 together drive the sealing plug 6 to close the return flow hole 40, thereby preventing the water in the hot water delivery pipe 32 from flowing through the return flow hole 40 to the cold water delivery pipe 31.

[0018] In this embodiment, the valve body 3 is an integrally formed tubular member, the hot water delivery pipe 32 and the cold water delivery pipe 31 are two parts of the pipe body, and the partition wall 4 is horizontally disposed at the connection of the hot water delivery pipe 32 and the cold water delivery pipe 31. Of course, in other equivalent embodiments, the valve body 3 may also be composed of two independent pipe bodies of the hot water delivery pipe 32 and the cold water delivery pipe 31 that are detachably connected together. The sealing plug 6 is arranged in the cold water pipe. When using hot water alone, the pressure at the cold water delivery pipe 31 end will be slightly greater than the pressure at the hot water delivery pipe 32 end. At this time, relying on the water pressure, the sealing plug 6 can be made to close the return flow hole 40, well reducing the problem of cold and hot water mixing.

[0019] The hot water delivery pipe 32 has a hollow structure, including a hot water inlet 33 and a hot water outlet 34. The hot water inlet 33 is arranged at the free end on the side away from the cold water delivery pipe 31, and the hot water outlet 34 is provided on the side wall of the hot water delivery pipe 32 near one end of the partition wall 4. The axes of the hot water inlet 33 and the hot water outlet 34 are perpendicularly arranged. The cold water delivery pipe 31 and the hot water delivery pipe 32 are coaxially arranged. Similarly, the cold water delivery pipe 31 also has a hollow structure, including a cold water inlet 35 and a cold water outlet 36. The cold water outlet 36 is provided on the side wall of the cold water delivery pipe 31, and the axes of the cold water inlet 35 and the cold water outlet 36 are perpendicularly arranged. From the sectional view, the water flow channels of the hot water delivery pipe 32 and the cold water delivery pipe 31 are both in an L shape.

[0020] The compression spring 7 is a helical elastic member with a fixed elastic coefficient, and its elastic force is proportional to the length of extrusion and contraction. The compression spring 7 is generally made of a metal material. The compression spring 7 can continuously apply a force to the sealing plug 6 to close the return through hole 40, but the closing force of the compression spring 7 is less than the opening force applied to the sealing plug 6 when the circulating water pump 13 in the system is working. When the positive pressure difference formed by the water in the pipe in the opening direction of the sealing plug 6 reaches 0.02 Mpa to 0.05 Mpa, the closing force of the compression spring 7 can be overcome, and the sealing plug 6 can be opened, so that the water in the hot water delivery pipe 32 can flow through the return through hole 40 to the cold water delivery pipe 31.

[0021] The temperature-sensitive elastic member 5 is an elastic member that can change according to different temperatures. The member shortens at low temperatures and elongates at high temperatures, and this telescopic change is repeatable. In this embodiment, the temperature-sensitive elastic member 5 is in the shape of a helical spring and is made of a shape memory alloy. The thermal deformation temperature of the temperature-sensitive elastic member 5 is 20°C to 40°C. Whether the temperature-sensitive elastic member 5 is in the extended state or the contracted state, as long as there is a deformation gap between its coils, the temperature-sensitive elastic member 5 has the ability of elastic deformation, that is, it can apply pressure to other objects through elastic deformation. However, the elastic coefficient of the temperature-sensitive elastic member 5 is set higher than that of the compression spring 7. When the temperature-sensitive elastic member 5 is in the extended state, it can apply a greater closing force to the sealing plug 6 than the compression spring 7. In order to ensure the rapid return of cold water, the temperature-sensitive elastic member 5 is separated from the sealing plug 6 in the contracted state, which reduces the closing force received by the sealing plug 6 and also provides space for the movement of the sealing plug 6. In addition, the temperature-sensitive elastic member 5 is arranged in the pipeline of the valve body 3 and is in direct contact with water, and the response speed is very fast, which not only ensures that hot water flows into the valve body 3, but also reduces the excessive hot water flowing into the cold water delivery pipe 31, that is, reduces ineffective heating and realizes energy conservation.

[0022] The advantage of arranging the temperature-sensitive elastic member 5 and the compression spring 7 in the valve body 3 at the same time is that not only can the compression spring 7 continuously apply a closing force to the sealing plug 6, so that the sealing plug 6 plugs the return through-hole 40 in a state where the left and right pressures are basically balanced, which well reduces the problem of cold and hot water mixing between the conveying pipes, and the cold water flowing back when the circulating water pump 13 starts can also open the sealing plug 6 within the set pressure range to achieve cold water return; when hot water flows through the temperature-sensitive elastic member 5, the temperature-sensitive elastic member 5 can be switched to an extended state. Under the combined action of the temperature-sensitive elastic member 5 and the compression spring 7, the sealing plug 6 is pressed tightly against the partition wall 4, and the pressure of the circulating water pump 13 cannot push open the sealing plug 6, and hot water cannot pass through the return through-hole 40. The flowmeter detects that the water flow rate becomes smaller, and the water heater and the circulating water pump 13 stop working. It can be seen that this technical solution does not need to install a control board and a temperature probe on the valve body 3, nor does it need to be signal-connected to the water heater. The structure of the valve body 3 is simple and reliable, and there is no problem of signal interference.

[0023] Combined with Figure 1 , in the water circulation system, when the hot water in the hot water pipe 14 flows to the position of the temperature-sensitive elastic member 5, when the temperature of the temperature-sensitive elastic member 5 is higher than the deformation temperature, it is switched to an extended state, and the temperature-sensitive elastic member 5 drives the sealing plug 6 to close the return through-hole 40 to prevent hot water from flowing back to the cold water pipe 15. The water circulation system further includes a controller 16 and a flow sensor 17 signal-connected to the controller 16. The flow sensor 17 is used to detect the water flow rate in the water conveying pipe. When the flow sensor 17 detects that the water flow rate in the water conveying pipe drops to a set value, it can send a stop signal to the controller 16, and the controller 16 can control the circulating water pump 13 and the heating device 12 to stop working after receiving the stop signal sent by the flow sensor 17.

[0024] Furthermore, the high-efficiency return valve 2 further includes a connecting shaft 8. The connecting shaft 8 is axially movably arranged in the valve body 3. One end of the connecting shaft 8 is connected to the sealing plug 6, and the other end is connected to the temperature-sensitive elastic member 5 and / or the compression spring 7. The temperature-sensitive elastic member 5 can drive the connecting shaft 8 and the sealing plug 6 to move together.

[0025] In this embodiment, the connecting shaft 8 and the temperature-sensitive elastic member 5 are arranged in the cold water conveying pipe 31. The connecting shaft 8 is provided with a shaft hole 81 at the end connected to the temperature-sensitive elastic member 5, and part of the temperature-sensitive elastic member 5 extends into the shaft hole 81. It further includes a shaft cover 37. The shaft cover 37 is detachably connected to the port of the cold water conveying pipe 31 and can limit the outward movement of the temperature-sensitive elastic member 5 and the connecting shaft 8.

[0026] Further, at least one shaft body water passage hole 82 is provided on the connecting shaft 8, and the shaft body water passage hole 82 communicates with the shaft hole 81 so that water can pass through. The advantage of this setting is that water must flow through the shaft hole 81 and the shaft body water passage hole 82 of the connecting shaft 8, which can not only guide hot water to flow through the temperature-sensitive elastic member 5 during hot water reflux, but also allow cold water to impact the connecting shaft 8 directly when cold water is normally discharged, thereby pushing the connecting shaft 8 and the sealing plug 6 towards the return through hole 40.

[0027] Further, when viewed axially, the projected area of the connecting shaft 8 is not less than the projected area of the return through hole 40. This setting is considered because when the hot water outlet 34 and the cold water outlet 36 are opened simultaneously, the water pressures in the hot water delivery pipe 32 and the cold water delivery pipe 31 are basically the same, but the areas on which the water pressures act on the connecting shaft 8 and the sealing plug 6 are different. According to the pressure principle, the side with a larger area receives a greater force, which causes the connecting shaft 8 and the sealing plug 6 to be pressed towards the return through hole 40 by the water pressure, facilitating the reduction of cold and hot water cross-flow.

[0028] Further, it further includes a middle shaft ring 91, the outer periphery of the middle shaft ring 91 is fixedly connected inside the cold water delivery pipe 31, and the middle section area of the connecting shaft 8 is inserted on the middle shaft ring 91. The middle shaft ring 91 can not only improve the axial movement stability of the connecting shaft 8, but also be used to support the compression spring 7.

[0029] Further, it further includes a filter screen 92, and the filter screen 92 is arranged at the cold water inlet 35. This can reduce the influence of sand and debris in the water pipe on the temperature-sensitive elastic member 5 and the compression spring 7, and improve the working stability and service life of the high-efficiency reflux valve 2.

Claims

1. A high-efficiency reflux valve, comprising a tubular valve body, wherein the valve body comprises a hot water delivery pipe and a cold water delivery pipe connected to each other; a partition wall is provided at the connection between the hot water delivery pipe and the cold water delivery pipe, and a reflux hole connecting the hot water delivery pipe and the cold water delivery pipe is provided on the partition wall; characterized in that: It also includes a temperature-sensitive elastic member and a sealing plug arranged in the valve body, the sealing plug being arranged in the cold water delivery pipe, the temperature-sensitive elastic member being able to switch between a contracted state and an extended state according to the water temperature in the delivery pipe, and a compression spring being arranged in the valve body and arranged in the same direction as the temperature-sensitive elastic member; when the temperature of the temperature-sensitive elastic member is lower than the deformation temperature, it is in a contracted state, the temperature-sensitive elastic member is separated from the sealing plug, the compression spring can drive the sealing plug to close the reflux flow hole, but at this time the water in the hot water delivery pipe can push the sealing plug open and flow to the cold water delivery pipe through the reflux flow hole; when the temperature of the temperature-sensitive elastic member is higher than the deformation temperature, it is in an extended state, the temperature-sensitive elastic member and the compression spring together drive the sealing plug to close the reflux flow hole, thereby preventing the water in the hot water delivery pipe from flowing to the cold water delivery pipe through the reflux flow hole.

2. The high-efficiency reflux valve according to claim 1, characterized in that: It also includes a connecting shaft, which is axially movably arranged in the valve body, one end of the connecting shaft is connected to the sealing plug, and the other end is connected to the temperature-sensitive elastic member and / or the compression spring, and the temperature-sensitive elastic member can drive the connecting shaft to move together with the sealing plug.

3. The high-efficiency reflux valve according to claim 2, characterized in that: The connecting shaft and the temperature-sensitive elastic part are arranged in the cold water delivery pipe. The connecting shaft is provided with an axial hole at one end connected to the temperature-sensitive elastic part, and part of the temperature-sensitive elastic part extends into the axial hole. The connecting shaft also includes a shaft cover, which is detachably connected to the port of the cold water delivery pipe and can limit the outward movement of the temperature-sensitive elastic part and the connecting shaft.

4. The high-efficiency reflux valve according to claim 3, characterized in that: The connecting shaft is also provided with at least one shaft body water passing hole, and the shaft body water passing hole is connected with the shaft hole so as to allow water to pass through.

5. The high-efficiency reflux valve according to claim 4, characterized in that: Viewed along the axial direction, the projected area of ​​the connecting shaft is not less than the projected area of ​​the recirculation hole.

6. The high-efficiency reflux valve according to claim 3, characterized in that: It also includes a central axis ring, the outer periphery of which is fixedly connected to the cold water delivery pipe, and the middle section of the connecting shaft is plugged into the central axis ring.

7. The high-efficiency reflux valve according to any one of claims 1 to 6, characterized in that: The temperature-sensitive elastic member is in the shape of a spiral spring and is made of a memory alloy. The thermal deformation temperature of the temperature-sensitive elastic member is 20° C. to 40° C.

8. The high-efficiency reflux valve according to any one of claims 1 to 6, characterized in that: The hot water delivery pipe includes a hot water inlet and a hot water outlet, the hot water outlet is arranged on the side wall of the hot water delivery pipe, and the axes of the hot water inlet and the hot water outlet are arranged vertically; the cold water delivery pipe includes a cold water inlet and a cold water outlet, the cold water outlet is arranged on the side wall of the cold water delivery pipe, and the axes of the cold water inlet and the cold water outlet are arranged vertically; the hot water delivery pipe and the cold water delivery pipe are arranged coaxially.

9. The high-efficiency reflux valve according to claim 8, characterized in that: It also includes a filter screen, which is arranged at the cold water inlet.

10. A water circulation system, characterized in that: The invention comprises a cold water source, a three-way valve, a heating device, a circulating water pump and a high-efficiency reflux valve as described in any one of claims 1 to 9, which are connected together through a water pipeline, wherein the cold water source is respectively connected to the water inlet end of the heating device and the cold water delivery pipe of the high-efficiency reflux valve through the three-way valve, the water outlet end of the heating device is connected to the hot water delivery pipe of the high-efficiency reflux valve, the circulating water pump is arranged upstream or downstream of the heating device, and the circulating water pump can allow the hot water in the heating device to flow to the high-efficiency reflux valve through the water pipeline; the cold water in the water pipeline can push open the sealing plug and flow back to the high-efficiency reflux valve through the reflux flow hole A heating device; when hot water in a water pipeline flows to the position of the temperature-sensitive elastic member, the temperature-sensitive elastic member switches to an extended state when the temperature is higher than the deformation temperature, and the temperature-sensitive elastic member drives the sealing plug to close the reflux hole, thereby preventing hot water from flowing back into the delivery pipe; and further comprising a controller and a flow sensor whose signal is connected to the controller, the flow sensor being used to detect the water flow in the water pipeline, and being able to send a stop signal to the controller when the flow sensor detects that the water flow in the water pipeline is reduced to a set value, and the controller being able to control the circulating water pump and the heating device to stop working after receiving the stop signal sent by the flow sensor.

Images