Automatic water closing valve and circulating pipeline comprising same

Abstract

The utility model provides an automatic water shutoff valve and a circulation pipeline including the same, the automatic water shutoff valve is arranged in series between a water inlet of a water purifier and the circulation pipeline, the automatic water shutoff valve comprises a valve body, when the water temperature in the circulation pipeline is higher than or equal to 38 DEG C, the valve body is kept closed, and when the water temperature in the circulation pipeline is lower than or equal to 38 DEG C, the valve body is closed; when the water temperature in the circulating pipeline is lower than 38 DEG C, the valve body is kept open; the sensing unit is arranged on the outer surface of the valve body in a sleeving manner and is used for identifying whether the valve body is opened or not; and the induction unit is electrically connected with the control panel, a signal emitter is arranged on the control panel, and when the valve body is closed, the circulation pipeline closes the heating unit through the control panel until the water temperature in the circulation pipeline is lower than 38 DEG C, and the valve body is opened again. The heating unit is closed through the control panel until the water temperature is reduced and the valve body is opened, so that water flows into the water purifier to meet the purified water taking requirement of a user.

Description

Technical Field

[0001] The utility model particularly relates to an automatic water shut-off valve and a circulation pipeline containing the same. Background Art

[0002] As people's quality of life improves, the number of smart home appliances increases accordingly. Smart home appliances aim to provide home appliances that better meet user needs. Common smart home appliances include water heaters and water purifiers. Water heaters are used to produce hot water, while water purifiers are used to purify water to meet the standards for direct drinking by users, ensuring the safety of users' drinking water.

[0003] At present, various smart home appliances are usually connected to the water circuit in sequence to form a circulation pipeline, so that the water heated by the water heater is circulated in the circulation pipeline to ensure that users can get hot water in time when using water, thereby improving the user experience. However, since the water inlet temperature of the household water purifier cannot exceed 40°C, after the circulation is completed, the temperature in the pipeline is uncontrollable and may exceed 40°C, thereby affecting the use and life of the water purifier, resulting in a bad experience and damage to the water purifier filter. The prior art is to ensure the service life of the water purifier filter by directly closing the branch pipeline connected to the water purifier through the valve body. However, when the user needs to use purified water and the valve body closes the branch pipeline, the water purifier cannot produce purified water, which reduces the user experience accordingly. Utility Model Content

[0004] The technical problem to be solved by the utility model is to overcome the defect in the prior art that the temperature entering the pipeline always exceeds the preset temperature and the user cannot get water, and to provide an automatic water shut-off valve and a circulation pipeline containing the same.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] An automatic water shut-off valve is provided in series between the water inlet and the circulation pipeline of a water purifier, and the automatic water shut-off valve comprises:

[0007] A valve body, when the water temperature in the circulation pipeline is higher than or equal to 38° C., the valve body remains closed, and when the water temperature in the circulation pipeline is lower than 38° C., the valve body remains open;

[0008] A sensing unit, wherein the sensing unit is sleeved on the outer surface of the valve body and is used to identify whether the valve body is open;

[0009] The sensing unit is electrically connected to the control board, and a signal transmitter is arranged on the control board. When the valve body is closed, the circulation pipeline closes the heating unit through the control board until the water temperature in the circulation pipeline is lower than 38°C, and then the valve body is opened again.

[0010] In this solution, by opening or closing the valve body within a preset temperature range, water with a temperature exceeding the preset range cannot enter the water purifier, thereby ensuring that the filter element of the water purifier is not damaged and increasing the service life of the water purifier and its filter element. Furthermore, the sensing unit recognizes that the valve body is closed, that is, the water temperature in the water circuit is high, and turns off the heating unit through the control panel, so that the water flow in the circulation pipeline cannot continue to be heated and gradually cools down over time until the water temperature drops below the preset temperature, the valve body opens, and the water flows into the water purifier without affecting the service life of the filter element, thereby meeting the user's demand for purified water.

[0011] Preferably, the valve body includes a flow channel, a valve core is arranged in the flow channel, a memory spring card is arranged at the end of the valve core close to the inlet of the flow channel, and an elastic part is arranged at the end of the valve core close to the outlet of the flow channel. When the water temperature is lower than 38°C, the elastic force of the memory spring card is less than the elastic force of the elastic part, and the flow channel remains open. When the water temperature is higher than or equal to 38°C, the elastic force of the memory spring card is greater than the elastic force of the elastic part, and the flow channel remains closed.

[0012] In this solution, a memory spring card and an elastic member are provided at both ends of the valve core, and both apply elastic force to the valve core at the same time to ensure that the water flow can enter the water purifier normally when the water temperature is low, below 38°C. When the water temperature is high, higher than or equal to 38°C, the memory spring card is affected by the water temperature and applies an elastic force greater than the elastic member to the valve core, thereby closing the flow channel in time to prevent hot water from entering the water purifier, damaging the water purifier filter element, and reducing the service life of the filter element. Compared with the memory spring, the memory spring card responds faster to the influence of water temperature and rebounds more quickly, so that the flow channel can be closed quickly, greatly reducing the flow of hot water entering the water purifier. Avoid slow closing of the flow channel, which causes irreversible damage to the filter element when some hot water enters the water purifier.

[0013] Preferably, a mounting groove is provided on the outer surface of the valve body, the mounting groove is located between the outlet of the flow channel and the valve core, the sensing unit is embedded in the mounting groove, and the valve core is made of magnetic material.

[0014] In this solution, by setting the installation groove close to the flow channel outlet, it is possible to timely identify whether the valve body is closed, and by setting the valve core to a magnetic material, the accuracy of identification is further improved.

[0015] Preferably, the flow channel further includes a bracket, the bracket is arranged between the inlet of the flow channel and the valve core, and the memory spring card is arranged on the bracket.

[0016] In this solution, the above arrangement is used to effectively support the memory spring card, thereby ensuring the reliability and repeatability of the deformation of the memory spring card.

[0017] Preferably, the valve core includes a valve stem and a sealing portion connected to the valve stem, the valve stem is located at an edge area of ​​the sealing portion, and the memory spring card is arranged corresponding to a middle area of ​​the sealing portion.

[0018] In this solution, through the above arrangement, when the memory spring card is deformed and the elastic force increases to push the sealing part to move, the smooth movement of the sealing part is ensured to prevent the sealing part from deviating from the axial direction of the flow channel.

[0019] Preferably, a guide groove is provided on the bracket, and the valve stem is inserted into the guide groove.

[0020] In this solution, the valve stem is inserted into the guide groove to guide the sealing part during its movement.

[0021] Preferably, a plug is further provided in the flow channel, the elastic member is provided on the plug, a through hole is provided on the plug, and the through hole is provided corresponding to the valve core, and when the flow channel is closed, the valve core abuts against the plug and closes the through hole.

[0022] In this solution, a plug is provided to effectively support the elastic part, and a through hole is provided on the plug to ensure that water flows into the water purifier through the through hole when the valve core is away from the plug, and when the valve core abuts against the plug, the through hole is closed by abutment to achieve automatic water shut-off.

[0023] A circulation pipeline comprises the automatic water shut-off valve as described above.

[0024] In this solution, the circulation pipeline includes the above-mentioned automatic water shut-off valve, so that when the water temperature in the circulation pipeline exceeds 38°C, part of the pipeline is cut off by the automatic water shut-off valve to prevent hot water from entering the water purifier.

[0025] Preferably, a water heater is arranged in series in the circulation pipeline, and the water heater includes a circulation pump and a heating unit. When the control panel of the automatic water shut-off valve sends a signal and turns off the heating unit, the water flow in the circulation pipeline continues to circulate through the circulation pump.

[0026] In this solution, through the above-mentioned settings, the water temperature is accelerated to decrease in a manner that the circulation pump drives the water flow to circulate in the circulation pipeline, so that the valve body can be automatically opened more quickly and the water can flow into the water purifier.

[0027] Preferably, a water purifier is arranged in parallel in the circulation pipeline, the circulation pipeline includes a water outlet pipe and a water return pipe, the water outlet pipe is connected to the water outlet of the water heater, the return pipe is connected to the return port of the water heater, the water purifier is arranged on the return pipe, and the automatic water shut-off valve is arranged in series between the return pipe and the water purifier.

[0028] In this solution, through the above-mentioned setting, when the water temperature in the circulation pipeline exceeds 38°C, the hot water is prevented from entering the water purifier through the automatic water shut-off valve.

[0029] The positive and progressive effect of the utility model is that the utility model opens or closes the valve body within a preset temperature range so that the water flow with a water temperature exceeding the preset range cannot enter the water purifier, thereby ensuring that the filter element of the water purifier is not damaged and increasing the service life of the water purifier and its filter element. Furthermore, the sensing unit recognizes that the valve body is closed, that is, the water temperature in the water circuit is high, and turns off the heating unit through the control panel, so that the water flow in the circulation pipeline cannot continue to be heated, and gradually cools down over time until the water temperature drops and is lower than the preset temperature. The valve body opens, and the water flows into the water purifier without affecting the service life of the filter element, thereby meeting the user's demand for purified water. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 This is a state diagram of an automatic water shut-off valve of a preferred embodiment of the utility model when the flow channel is opened.

[0031] Figure 2 This is a state diagram of the automatic water shut-off valve of a preferred embodiment of the utility model when the flow channel is closed.

[0032] Figure 3 This is a schematic diagram of a circulation pipeline according to a preferred embodiment of the present invention.

[0033] Description of reference numerals:

[0034] Valve body 100

[0035] Sensing unit 200

[0036] Control Panel 300

[0037] Runner 1

[0038] Import 11

[0039] Exit 12

[0040] Spool 2

[0041] Stem 21

[0042] Sealing part 22

[0043] Memory spring card 3

[0044] Elastic parts 4

[0045] Bracket 5

[0046] Guide groove 51

[0047] Plug 6

[0048] Through hole 61

[0049] Tap 7

[0050] Shower 8

[0051] Water Purifier 10

[0052] Circulation line 20

[0053] Outlet pipe 23

[0054] Return pipe 24

[0055] Water heater 30

[0056] Water outlet 31

[0057] Return water outlet 32 DETAILED DESCRIPTION

[0058] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0059] This embodiment provides an automatic water shut-off valve, the specific structure of which is as follows Figure 1 , Figure 2 and Figure 3 As shown, the automatic water shut-off valve is arranged in series between the water inlet of the water purifier 10 and the circulation pipeline 20, and the automatic water shut-off valve includes:

[0060] The valve body 100 is closed when the water temperature in the circulation pipeline 20 is higher than or equal to 38°C, and is opened when the water temperature in the circulation pipeline 20 is lower than 38°C;

[0061] The sensing unit 200 is sleeved on the outer surface of the valve body 100 and is used to identify whether the valve body 100 is open;

[0062] The control board 300, the sensing unit 200 is electrically connected to the control board 300, and a signal transmitter (not shown in the figure) is provided on the control board 300. When the valve body 100 is closed, the circulation pipeline 20 turns off the heating unit (not shown in the figure) through the control board 300, until the water temperature in the circulation pipeline 20 is lower than 38°C, and the valve body 100 is opened again.

[0063] It is understood that the valve body 100 is configured to be closed within a predetermined temperature range so that water exceeding the predetermined temperature cannot enter the water purifier 10 through the valve body 100, for example, the water temperature is higher than or equal to 38° C. At the same time, the valve body 100 is also configured to be opened within a predetermined temperature range so that when the water reaches the predetermined temperature, the water enters the water purifier 10 through the opened valve body 100, so that the user can normally use the purified water.

[0064] In this embodiment, the valve body 100 is a cylindrical structure, the sensing unit 200 is a ring structure, and the sensing unit 200 is sleeved on the outer peripheral side of the valve body 100. The sensing unit 200 is used to identify whether the valve body 100 is open. Its identification method adopts the identification means in the prior art, for example, by identifying the sound of water flow in the valve body 100, the decibel number when the valve body 100 is opened and the decibel number when the valve body 100 is closed are preset, so that when the valve body 100 is closed due to excessive water temperature, the signal is further transmitted to the control board 300 by identifying the sound. The control board 300 is a plate and is attached to the outer surface of the valve body 100. The control board 300 is electrically connected to the heating unit, and the control board 300 is electrically connected to the sensing unit 200. The control board 300 is a control board 300 used for identifying and sending signals in the prior art. This embodiment is not an improvement on its control logic, and no further details are given here. The signal transmitter can be a WiFi transmission structure in the prior art to achieve the transmission of the signal to the heating unit.

[0065] It should be noted that by opening or closing the valve body 100 within the preset temperature range, water with a water temperature exceeding the preset range cannot enter the water purifier 10, thereby ensuring that the filter element of the water purifier 10 is not damaged and improving the service life of the water purifier 10 and its filter element. Further, the sensing unit 200 recognizes that the valve body 100 is closed, that is, the water temperature in the water circuit is high, and the heating unit is turned off through the control board 300, so that the water flow in the circulation pipeline 20 can no longer be heated, and gradually cools down over time, until the water temperature drops and is lower than the preset temperature, the valve body 100 opens automatically, and the water flows into the water purifier 10 without affecting the service life of the filter element, thereby meeting the user's demand for purified water.

[0066] In this embodiment, the valve body 100 includes a flow channel 1, a valve core 2 is arranged in the flow channel 1, a memory spring card 3 is arranged at the end of the valve core 2 close to the inlet 11 of the flow channel 1, and an elastic part 4 is arranged at the end of the valve core 2 close to the outlet 12 of the flow channel 1. When the water temperature is lower than 38°C, the elastic force of the memory spring card 3 is less than the elastic force of the elastic part 4, and the flow channel 1 remains open. When the water temperature is higher than or equal to 38°C, the elastic force of the memory spring card 3 is greater than the elastic force of the elastic part 4, and the flow channel 1 remains closed.

[0067] Specifically, a flow channel 1 is provided in the valve body 100. The flow channel 1 is a cylindrical structure and extends along the length direction of the valve body 100 and penetrates the valve body 100 for water to flow through. It can be understood that the direction of water flow is from the circulation pipeline 20 to the water purifier 10 through the flow channel 1. The valve core 2 has the same shape and size as the inner wall of the flow channel 1, so that the flow channel 1 is opened or closed by the valve core 2. This is a prior art and will not be described in detail here. It should be noted that the memory spring card 3 is not a memory spring. The memory spring card is also made of memory metal in the prior art. The memory metal is a special metal material that can restore its original macroscopic shape in another temperature range after plastic deformation within a certain temperature range, such as a nickel-titanium alloy material. Compared with the memory spring, the memory spring card 3 has a shorter deformation process and provides the required elastic force more quickly. On this basis, by arranging a memory spring card 3 and an elastic part 4 at both ends of the valve core 2, the elastic part 4 can be an ordinary spring in the prior art, which does not have the ability to deform within a certain temperature range. The elastic part 4 provides a preset and constant elastic force, and then both apply elastic force to the valve core 2 at the same time, and when the water temperature is low, below 38°C, the elastic force of the elastic part 4 is greater than the elastic force of the memory spring card 3, so that the valve core 2 opens the flow channel 1, ensuring that the water flow can enter the water purifier 10 normally.

[0068] When the water temperature is high, that is, when the water temperature is higher than or equal to 38°C, the memory spring card 3 is affected by the water temperature and exerts an elastic force on the valve core 2 that is greater than the elastic member 4, thereby pushing the valve core 2 to move along the axial direction of the flow channel 1 and closing the flow channel 1 in time to prevent hot water from entering the water purifier 10 and damaging the water purifier filter element, thereby reducing the service life of the filter element. Compared with the memory spring, the memory spring card 3 responds faster to the influence of water temperature and rebounds more quickly, so that the flow channel 1 can be closed quickly, greatly reducing the flow of hot water entering the water purifier 10. When the flow channel 1 is closed slowly, some hot water enters the water purifier 10 to cause irreversible damage to the filter element.

[0069] Furthermore, the memory spring card 3 is an arc-shaped structure. When the water temperature is lower than 38°C, the opening of the memory spring card 3 faces the valve core 2. When the water temperature is higher than or equal to 38°C, the opening of the memory spring card 3 faces the inlet 11 of the flow channel 1.

[0070] Specifically, the flow channel 1 includes an inlet 11 and an outlet 12, the valve core 2 is arranged near the outlet 12, and the memory spring card 3 is arranged near the inlet 11. From the cross section of the memory spring card 3, it is an arc-shaped structure, and the opening of the arc-shaped structure changes direction during the deformation process. When the opening is toward the valve core 2, the elastic force of the elastic member 4 is greater than the elastic force of the memory spring card 3, and when the opening is toward the inlet 11, the elastic force of the memory spring card 3 is greater than the elastic force of the elastic member 4. It can be understood that the change of the opening direction of the arc-shaped structure during the deformation process is not a slow change, but directly changes from one direction to another, thereby making the arc-shaped memory spring card 3 shorter in deformation process than the memory spring with a spiral structure, and can quickly apply an elastic force greater than the elastic member 4 to the valve core 2, so that the response is faster and the flow channel 1 is closed faster.

[0071] In other embodiments, the memory spring card 3 is a hemispherical structure. It is understandable that the hemispherical structure is a kind of arc structure, and its size is larger than that of the strip-shaped arc structure. When the memory spring card 3 is deformed by the water temperature, the hemispherical structure provides a greater elastic force when deformed than the arc structure, that is, the greater elastic force can push the valve core 2 to move and close the flow channel 1 more quickly than the strip-shaped arc structure, so as to further reduce the time required for automatic water shut-off, thereby reducing the flow of hot water entering the water purifier 10.

[0072] In this embodiment, a mounting groove is formed on the outer surface of the valve body 100 , and the mounting groove is located between the outlet 12 of the flow channel 1 and the valve core 2 . The sensing unit 200 is embedded in the mounting groove, and the valve core 2 is made of magnetic material.

[0073] Specifically, the mounting groove is an annular groove to cooperate with the ring-shaped sensing unit 200. The mounting groove is arranged near the outlet of the flow channel. In this embodiment, the sensing unit 200 is an energized coil, and the valve core 2 is made of magnetic material. When the valve core 2 reciprocates in the flow channel 1 and passes through the area where the energized coil is located, the sensing unit 200 can recognize that the valve core 2 is close to the outlet 12 of the flow channel 1, that is, the flow channel 1 is closed, and then timely send a signal to the control board 300 through the sensing unit 200, further improving the accuracy of recognition.

[0074] In this embodiment, the flow channel 1 further includes a bracket 5 , which is disposed between the inlet 11 of the flow channel 1 and the valve core 2 , and the memory spring card 3 is disposed on the bracket 5 .

[0075] Specifically, the bracket 5 is a cylindrical structure, and the memory spring card 3 is fixedly connected to the bracket 5. The connection method can be welding or screw connection. This is a prior art and will not be described in detail here. The valve core 2 is movably connected to the bracket 5, and the position of the bracket 5 in the flow channel 1 is limited by a retaining spring. By setting the bracket 5, the memory spring card 3 is effectively supported to ensure the reliability and repeatability of the deformation of the memory spring card 3. In addition, the bracket 5 can also limit the position of the valve core 2 in the flow channel 1 to prevent the valve core 2 from entering the circulation pipeline 20 from the inlet 11 of the flow channel 1, so as to improve the safety of the circulation pipeline 20.

[0076] Furthermore, the valve core 2 includes a valve stem 21 and a sealing portion 22 connected to the valve stem. The valve stem 21 is located at an edge area of ​​the sealing portion 22 , and the memory spring card 3 is disposed corresponding to a middle area of ​​the sealing portion 22 .

[0077] Specifically, the sealing part 22 is a disc structure, and a guide surface is provided at the edge of the disc structure, so that the mobility of the sealing part 22 is improved when it moves in the flow channel 1. Among them, the valve stem 21 is provided with multiple valve stems 21 and the multiple valve stems 21 are evenly distributed in the edge area of ​​the sealing part 22, and the valve stem 21 extends along the axial direction of the flow channel 1, thereby avoiding the memory spring card 3 provided in the middle area of ​​the corresponding sealing part 22. In other words, when the memory spring card 3 is deformed, it pushes the middle area of ​​the sealing part 22 of the valve core 2. Compared with pushing other areas of the sealing part 22, pushing the middle area of ​​the sealing part 22 can make the sealing part 22 move and close the flow channel 1 more smoothly, and avoid the sealing part 22 from deviating from the axial direction of the flow channel 1 when moving.

[0078] It is understandable that, in this embodiment, the sealing portion 22 is made of magnetic material, and the valve stem 21 may be made of other materials, such as metal material, so as to reduce the manufacturing cost of the valve core 2 .

[0079] In this embodiment, a guide groove 51 is provided on the bracket 5 , and the valve stem 21 is inserted into the guide groove 51 .

[0080] Specifically, a guide groove 51 is provided in the edge area of ​​the bracket 5 corresponding to the edge area of ​​the sealing part 22, and the guide groove 51 also extends along the axial direction of the flow channel 1. The valve stem 21 is inserted into the guide groove 51, and the size of the guide groove 51 is larger than the size of the valve stem 21. When the memory spring card 3 deforms and pushes the sealing part 22, the valve stem 21 located in the guide groove 51 is guided by the guide groove 51 so that the sealing part 22 always moves along the axial direction of the flow channel 1, thereby playing a guiding role in the movement of the sealing part 22.

[0081] In this embodiment, a plug 6 is further provided in the flow channel 1, and the elastic member 4 is provided on the plug 6. A through hole 61 is provided in the middle area of ​​the plug 6, and the through hole 61 is provided corresponding to the valve core 2. When the flow channel 1 is closed, the valve core 2 abuts against the plug 6 and closes the through hole 61.

[0082] Specifically, the plug 6 is arranged near the outlet 12 of the flow channel 1 and is located at one end of the valve core 2 away from the memory spring card 3. The elastic member 4 is arranged in the middle area of ​​the plug 6. The elastic member 4 located in the middle area of ​​the plug 6 corresponds to the memory spring card 3 located at the other end of the valve core 2 and in the middle area of ​​the sealing portion 22, so that when the elastic force of the elastic member 4 is greater than the elastic force of the memory spring card 3, the valve core 2 is pushed to move to the bracket 5 along the axial direction of the flow channel 1 to avoid the displacement of the valve core 2. A through hole 61 is arranged on the plug 6 to ensure that the water flows into the water purifier through the through hole 61 when the valve core 2 is away from the plug 6, and when the valve core 2 abuts against the plug 6, the through hole 61 is closed by abutment to achieve automatic water shut-off.

[0083] This embodiment also provides a circulation pipeline 20, such as Figure 3 As shown, the circulation pipeline 20 includes the above-mentioned automatic water shut-off valve. The circulation pipeline 20 includes the above-mentioned automatic water shut-off valve, so that when the water temperature in the circulation pipeline 20 exceeds 38°C, the automatic water shut-off valve cuts off part of the pipeline. It can be understood that part of the pipeline refers to the pipeline connected to the water purifier 10, so that hot water cannot enter the water purifier 10 to protect the service life of the filter element of the water purifier 10. Of course, while cutting off part of the pipeline, it can also ensure that the normal circulation function in the circulation pipeline 20 is not affected.

[0084] In this embodiment, a water heater 30 is arranged in series in the circulation pipeline 20. The water heater 30 includes a circulation pump (not shown in the figure) and a heating unit. When the control panel 300 of the automatic water shut-off valve sends a signal and turns off the heating unit, the water flow in the circulation pipeline 20 continues to circulate through the circulation pump.

[0085] Specifically, the circulation pipeline 20 is a closed pipeline, in which the water heater 30 is connected in series, and the control board 300 is electrically connected to the heating unit in the water heater 30, so that when the water temperature in the circulation pipeline 20 exceeds 38°C, the heating unit is turned off by transmitting a signal. At this time, the water flow in the circulation pipeline 20 is no longer heated, and the water temperature will decrease over time when the water flow contacts the pipe wall of the pipeline, until the water temperature drops below 38°C, the automatic water shut-off valve opens, and the water flow can enter the water purifier 10, so that the user can use the purified water without manual opening.

[0086] Furthermore, the circulation pump in the water heater 30 is always kept on when the heating unit is turned off, so as to continuously pump and circulate the water in the circulation pipeline 20, thereby accelerating the reduction of water temperature by driving the water to circulate in the circulation pipeline 20 through the circulation pump, so as to make the valve body 100 automatically open and allow the water to enter the water purifier 10 more quickly.

[0087] In this embodiment, a water purifier 10 is arranged in parallel in the circulation pipeline 20. It can be understood that the parallel arrangement means that the water purifier 10 is connected in parallel with the water heater 30. The circulation pipeline 20 includes a water outlet pipe 23 and a return pipe 24. The water outlet pipe 23 is connected to the water outlet 31 of the water heater 30, and the return pipe 24 is connected to the return port 32 of the water heater 30. The water purifier 10 is arranged on the return pipe 24, and the automatic water shut-off valve is arranged in series between the return pipe 24 and the water purifier 10.

[0088] Specifically, a cold water pipe is provided on one side of the circulation pipeline 20 to replenish water flow in the circulation pipeline 20, and the water heater 30 is arranged in series in the circulation pipeline 20. The water outlet 31 of the water heater 30 is used to output hot water into the circulation pipeline 20, and the water return port 32 of the water heater 30 is used to guide the water flow of the temperature angle in the circulation pipeline 20 into the water heater 30 and heat it until the hot water temperature required by the user is reached. On this basis, the water outlet pipe 23 and the water return pipe 24 are connected end to end to form the circulation pipeline 20, and the circulation pipeline 20 is used to circulate the water flow until the user takes it. It can be understood that the circulation pipeline 20 of this embodiment is the same as the circulation pipeline in the prior art, and its pipeline arrangement has not been improved, so it will not be described in detail here. A branch is provided on the return pipe 24, and an automatic water shut-off valve and a water purifier 10 are provided in series on the branch. That is to say, the water heater 30 on the circulation pipeline 20 and the water purifier 10 on the branch are connected in parallel with each other, and an automatic water shut-off valve is provided in series on the branch, so that when the water temperature in the circulation pipeline 20 exceeds 38°C, the automatic water shut-off valve prevents the hot water in the branch from entering the water purifier 10.

[0089] In this embodiment, a faucet 7 or a shower head 8 is also arranged in series on the water outlet pipe 23 .

[0090] Specifically, the circulation pipeline 20 is connected in series with the water heater 30 on the water outlet pipe 23 so that when the water flow is heated, it can be promptly taken by the user through the faucet 7 and the shower 8, thereby reducing the amount of hot water in the circulation pipeline 20. The reduced water volume is replenished by the cold water pipe, so that the water temperature of the water flow in the circulation pipeline 20 can be quickly reduced, thereby ensuring the service life of the filter element of the water purifier 10.

[0091] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. An automatic water shut-off valve, which is arranged in series between the water inlet and the circulation pipeline of a water purifier, characterized in that: The automatic water shut-off valve comprises: A valve body, when the water temperature in the circulation pipeline is higher than or equal to 38° C., the valve body remains closed, and when the water temperature in the circulation pipeline is lower than 38° C., the valve body remains open; A sensing unit, wherein the sensing unit is sleeved on the outer surface of the valve body and is used to identify whether the valve body is open; The sensing unit is electrically connected to the control board, and a signal transmitter is arranged on the control board. When the valve body is closed, the circulation pipeline closes the heating unit through the control board until the water temperature in the circulation pipeline is lower than 38°C, and then the valve body is opened again.

2. The automatic water shut-off valve according to claim 1, characterized in that: The valve body includes a flow channel, a valve core is arranged in the flow channel, a memory spring card is arranged at the end of the valve core close to the inlet of the flow channel, and an elastic part is arranged at the end of the valve core close to the outlet of the flow channel. When the water temperature is lower than 38°C, the elastic force of the memory spring card is less than the elastic force of the elastic part, and the flow channel remains open. When the water temperature is higher than or equal to 38°C, the elastic force of the memory spring card is greater than the elastic force of the elastic part, and the flow channel remains closed.

3. The automatic water shut-off valve according to claim 2, characterized in that: An installation groove is provided on the outer surface of the valve body, the installation groove is located between the outlet of the flow channel and the valve core, the induction unit is embedded in the installation groove, and the valve core is made of magnetic material.

4. The automatic water shut-off valve according to claim 3, characterized in that: The flow channel also includes a bracket, which is arranged between the inlet of the flow channel and the valve core, and the memory spring card is arranged on the bracket.

5. The automatic water shut-off valve according to claim 4, characterized in that: The valve core includes a valve stem and a sealing portion connected to the valve stem, the valve stem is located at an edge area of ​​the sealing portion, and the memory spring card is arranged corresponding to a middle area of ​​the sealing portion.

6. The automatic water shut-off valve according to claim 5, characterized in that: The bracket is provided with a guide groove, and the valve stem is inserted into the guide groove.

7. The automatic water shut-off valve according to claim 2, characterized in that: A plug is also provided in the flow channel, the elastic member is provided on the plug, a through hole is provided on the plug, and the through hole is provided corresponding to the valve core. When the flow channel is closed, the valve core abuts against the plug and closes the through hole.

8. A circulation pipeline, characterized in that: The circulation pipeline comprises an automatic water shut-off valve as described in any one of claims 1-7.

9. The circulation pipeline according to claim 8, characterized in that: A water heater is arranged in series in the circulation pipeline, and the water heater includes a circulation pump and a heating unit. When the control panel of the automatic water shut-off valve sends a signal and turns off the heating unit, the water flow in the circulation pipeline continues to circulate through the circulation pump.

10. The circulation pipeline according to claim 9, characterized in that: A water purifier is arranged in parallel in the circulation pipeline, and the circulation pipeline includes a water outlet pipe and a water return pipe. The water outlet pipe is connected to the water outlet of the water heater, and the water return pipe is connected to the water return port of the water heater. The water purifier is arranged on the water return pipe, and the automatic water shut-off valve is arranged in series between the water return pipe and the water purifier.

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