Check valve and water purifier

Abstract

The check valve comprises a shell and a check assembly, the shell is provided with an inlet, an outlet and a flow channel communicated with the inlet and the outlet, the check assembly is installed in the flow channel and used for one-way conduction of the check valve in the direction from the inlet to the outlet, the check valve further comprises an exhaust valve, a through hole is formed in the wall face of the shell, and the exhaust valve is arranged in the through hole. The through hole is located in the upstream of the non-return assembly, the exhaust valve is installed in the through hole and comprises a valve element, and the valve element is rotationally connected to the shell; when the valve element rotates to the first position, the through hole is opened, and the flow channel communicates with the outside through the through hole. And when the valve element rotates to the second position, the through hole is closed. The exhaust structure is arranged on the upstream portion of the check structure, the through hole is opened or closed by rotating the valve element to the first position or the second position, the exhaust structure is used for exhausting gas in an upstream flow channel of the check valve, remaining liquid pulled by the check structure is discharged, exhaust of the centrifugal pump installed on the upstream portion of the check valve is facilitated, and the efficiency of the centrifugal pump is improved.

Description

Technical Field

[0001] The utility model relates to a check valve and a water purifier. Background Art

[0002] The check valve only allows the liquid to flow in one direction and prevents the liquid from flowing back. It is used to protect the upstream equipment and improve the stability of the system. The check valve often works automatically. When the fluid flows in the normal direction, the valve disc or piston is opened by the kinetic energy of the fluid, and when the fluid flows back, these components automatically close and cut off the fluid channel. Due to the above advantages of the check valve, the check valve has been widely used in aquatic products, such as water heaters, water purifiers, etc. Especially for some products with complex waterways and many branches, when it is necessary to prevent the reverse flow of water, it is achieved through the check valve. However, in some cases, when the check valve realizes the function of preventing the reverse flow of water, it also brings a problem: the problem of air trapped at the front end of the check valve. For example, when using a centrifugal pump to pump water from a water tank, if a check valve is needed after the centrifugal pump, when the centrifugal pump empties the water in the water tank, air enters the centrifugal pump, which will cause the problem of water trapped air. Utility Model Content

[0003] The technical problem to be solved by the utility model is to overcome the defect of the check valve in the prior art that air is easily trapped, and to provide a check valve and a water purifier.

[0004] The utility model solves the above technical problems through the following technical solutions:

[0005] A check valve, comprising a housing and a check assembly, wherein the housing has an inlet, an outlet and a flow channel connecting the inlet and the outlet, the check assembly is mounted on the flow channel and is used for the check valve to unidirectionally conduct from the inlet toward the outlet, the check valve also comprising an exhaust valve, a through hole is provided on the wall surface of the housing, the through hole is located upstream of the check assembly, the exhaust valve is mounted on the through hole, the exhaust valve comprises a valve core, and the valve core is rotatably connected to the housing;

[0006] When the valve core rotates to the first position, the through hole is opened, and the flow channel is connected to the outside through the through hole;

[0007] When the valve core rotates to the second position, the through hole is closed.

[0008] In this solution, the check valve is provided with an exhaust structure upstream of the check structure, and the through hole is opened or closed by rotating the valve core to the first position or the second position, which is used to discharge the gas in the flow channel upstream of the check valve, so that the retained liquid pulled by the check structure is discharged, and it is also convenient to exhaust the centrifugal pump installed upstream of the check valve, thereby improving the efficiency of the centrifugal pump. In addition, the through hole is opened or closed by rotating the valve core, which is simple and convenient to operate.

[0009] Preferably, the valve core comprises an end cover and an abutment portion, and the inner wall of the through hole is provided with a valve seat;

[0010] When the valve core rotates to the first position, the abutment portion is separated from the valve seat, and the through hole is opened;

[0011] When the valve core rotates to the second position, the abutting portion abuts against the valve seat, the end cover is threadedly connected to the raised portion of the housing, and the through hole is closed.

[0012] In this solution, the abutment portion of the valve core is arranged correspondingly to the valve seat. When the valve core rotates to the second position, the abutment portion abuts against the valve seat, and the valve core closes the through hole. When the valve core rotates to the first position, the abutment portion is separated from the valve seat, the through hole is opened, and the flow channel is connected to the outside through the through hole. The valve core is threadedly connected to the raised portion of the housing through the end cover, so that the position of the valve core can be adjusted by rotating the end cover to realize the opening and closing of the through hole, which is simple and convenient to operate.

[0013] Preferably, the exhaust valve further comprises a sealing ring, wherein the sealing ring is arranged between the abutting portion and the valve seat, and a groove is arranged on the outer peripheral surface of the abutting portion, and the sealing ring is embedded in the groove.

[0014] In this solution, the sealing ring is used to seal the gap between the abutment portion and the valve seat to prevent air or liquid leakage at the through hole when the valve core is in the second position. The sealing ring is installed on the valve core and moves synchronously with the valve core.

[0015] In other alternatives, the sealing ring can also be installed on the valve seat.

[0016] Preferably, there are multiple sealing rings, which are arranged at intervals along the axial direction of the valve core.

[0017] Preferably, the end of the abutting portion and the inner wall of the valve seat are both provided with chamfers;

[0018] And / or, the through hole includes a sealing section and an expansion section, the sealing section is arranged close to the valve seat, the expansion section is located on the outside of the sealing section, the inner diameter of the sealing section is adapted to the outer diameter of the abutment portion, and the inner diameter of the expansion section is larger than the diameter of the valve core.

[0019] In this solution, chamfers are provided at the end of the abutting portion and the inner wall of the valve seat, so that the valve core can slide smoothly into or out of the valve seat.

[0020] The through hole is arranged to be a sealing section and an expansion section with different inner diameters. When opening the through hole, there is no need to completely remove the valve core. The through hole can be opened by simply moving the valve core from the sealing section to the expansion section, thereby reducing the sliding stroke of the valve core and simplifying the operation.

[0021] Preferably, a recessed portion is provided on the housing, the through hole is located in the recessed portion, the valve core is embedded in the recessed portion and can rotate relative to the housing along the radial direction of the through hole, and a through hole is provided on the valve core;

[0022] When the valve core rotates to the first position, the through hole is at least partially aligned with the through hole, the through hole is opened, and the flow channel is connected to the outside through the through hole and the through hole;

[0023] When the valve core rotates to the second position, the through hole is misaligned with the through hole, and the through hole is closed.

[0024] In this solution, the valve core is embedded in the recessed portion and rotates in the recessed portion, and the structure is compact.

[0025] A through hole is arranged on the valve core. When the valve core rotates to a position where the through hole is at least partially aligned with the through hole (first position), the through hole can be opened. When the valve core rotates to a position where the through hole is misaligned with the through hole (second position), the valve core covers the through hole, so that the through hole can be closed. The angle range of the valve core rotation is small, the volume of the valve core is small, and there is no need to rotate the valve core to a position that is completely misaligned with the through hole.

[0026] Preferably, a limiting portion is provided on the inner wall of the recessed portion, and the limiting portion abuts against the outer side of the valve core;

[0027] And / or, the outer end of the valve core also has a knob protruding outwards;

[0028] And / or, the check valve further comprises a sealing ring, the bottom surface of the recessed portion comprises a groove, the groove is arranged around the circumference of the through hole, the sealing ring is embedded in the groove, and the outer side of the sealing ring abuts against the bottom surface of the valve core.

[0029] In this solution, a limiting portion is provided on the inner wall of the recessed portion, and the limiting portion abuts against the outer side of the valve core, that is, the edge of the valve core is clamped in the groove formed between the limiting portion and the bottom surface of the recessed portion, so as to facilitate the rotation of the valve core in the groove and prevent the valve core from falling out.

[0030] By arranging a knob at the outer end of the valve core, it is convenient to manually operate the knob to switch the position of the valve core.

[0031] When the valve core is in the second position, the sealing ring is used to seal the gap between the valve core and the housing to prevent the check valve from leaking air or liquid through the through hole, thereby improving air tightness.

[0032] Of course, in other alternative solutions, the sealing ring may also be arranged on the inner side of the valve core.

[0033] Preferably, the inner wall of the through hole is provided with a valve seat and a spiral guide groove extending along the axial direction of the valve core, the guide groove is located above the valve seat, and the outer peripheral surface of the valve core is provided with a raised guide portion, and the guide portion is slidably arranged in the guide groove;

[0034] When the valve core rotates to the first position, the abutting portion of the valve core is separated from the valve seat, and the through hole is opened;

[0035] When the valve core rotates to the second position, the abutting portion of the valve core abuts against the valve seat, and the through hole is closed.

[0036] In this solution, the valve core slides in the spiral guide groove through the guide slide part, thereby realizing the lifting and lowering movement of the valve core relative to the valve seat, and then realizing the abutment or separation of the valve core and the valve seat, thereby opening or closing the through hole. The structure is simple, and the operation is simple and convenient. The spiral guide groove can fix the valve core through the guide slide part. The valve core is not easy to swing during the lifting process, and the opening or closing position is accurate.

[0037] Preferably, there are multiple guide grooves, which are arranged at intervals along the circumferential direction of the valve core, and the guide parts are arranged one-to-one with the guide grooves to improve the guide effect between the valve core and the housing.

[0038] Preferably, the inner wall of the through hole is further provided with a limiting portion, and the limiting portion is located at the upper end of the guide slide groove and is used to abut against the guide slide portion;

[0039] And / or, an exhaust hole penetrating the wall surface is further provided on the inner wall of the through hole, the exhaust hole is located at the upper end of the valve seat, and the exhaust hole is communicated with the portion of the through hole located at the upper end of the valve seat.

[0040] In this solution, the limiting portion is used to abut the guide slide portion to limit the rotation angle of the valve core and prevent the guide slide portion from rotating out of the guide slide groove to cause structural damage to the guide slide portion or the guide slide groove.

[0041] Preferably, a flange is also provided on the outer circumferential surface of the valve core, and the flange is adapted to the through hole.

[0042] In this solution, the flange is matched with the through hole to form a guide mechanism. When the valve core is lifted or lowered, the flange slides in the through hole to prevent the valve core from swinging and improve the accuracy of the sliding direction of the valve core.

[0043] Preferably, the exhaust valve further comprises an outer cover, which is sleeved on the valve core and detachably connected to the outer shell. The outer cover is used to protect the valve core and prevent dust from entering the through hole. The outer cover is detachably connected to the outer shell, which facilitates the disassembly and assembly of the valve core. The distance between the outer cover and the flange is greater than the stroke of the valve core moving in the axial direction, so as to prevent interference between the outer cover and the flange during the rising process of the valve core.

[0044] A water purifier comprises a centrifugal pump and the check valve as described above, wherein the check valve is installed at the water outlet end of the centrifugal pump.

[0045] In this solution, the check valve prevents water from flowing back to the centrifugal pump and is used to protect the centrifugal pump. When gas is trapped between the centrifugal pump and the check valve, the gas can be exhausted by opening the exhaust valve on the check valve, so that the inner cavity of the centrifugal pump is filled with water, thereby improving the working efficiency of the centrifugal pump.

[0046] On the basis of conforming to the common sense in the art, the above-mentioned preferred conditions can be arbitrarily combined to obtain the preferred embodiments of the utility model.

[0047] The positive and progressive effect of the utility model is that the check valve is provided with an exhaust structure upstream of the check structure, and the through hole is opened or closed by rotating the valve core to the first position or the second position, which is used to discharge the gas in the flow channel upstream of the check valve, so that the retained liquid pulled by the check structure is discharged, and it is also convenient to exhaust the centrifugal pump installed upstream of the check valve, thereby improving the efficiency of the centrifugal pump. In addition, the through hole is opened or closed by rotating the valve core, which is simple and convenient to operate. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] Figure 1 The structure of the check valve of the first embodiment of the utility model is shown in FIG. Figure 1 .

[0049] Figure 2 The structure of the check valve of the first embodiment of the utility model is shown in FIG. Figure 2 .

[0050] Figure 3 for Figure 2 Sectional view along line AA.

[0051] Figure 4 This is a schematic structural diagram of the check valve of Example 2 of the utility model.

[0052] Figure 5 for Figure 4 Sectional view along line BB.

[0053] Figure 6 This is a schematic diagram of the structure of the shell of Example 2 of the utility model.

[0054] Figure 7 This is a schematic diagram of the structure of the valve core of Example 2 of the utility model.

[0055] Figure 8 This is a schematic structural diagram of the check valve of Example 3 of the utility model.

[0056] Fig. 9 for Figure 8Sectional view along line CC.

[0057] Fig.10 This is a schematic diagram of the structure of the shell of Example 3 of the utility model.

[0058] Fig.11 This is a schematic diagram of the structure of the valve core of Example 3 of the utility model.

[0059] Description of reference numerals:

[0060] Shell 1

[0061] Import 11

[0062] Exit 12

[0063] Runner 13

[0064] Through hole 14

[0065] Sealing section 141

[0066] Expansion section 142

[0067] Valve seat 15

[0068] Depression 16

[0069] Limiting part 161

[0070] Guide chute 17

[0071] Exhaust hole 18

[0072] Check component 2

[0073] Exhaust valve 3

[0074] Spool 31

[0075] End cap 311

[0076] Contact portion 312

[0077] Via 313

[0078] Knob 314

[0079] Guide sliding part 315

[0080] Flange 316

[0081] Sealing ring 32

[0082] Outer cover 33 DETAILED DESCRIPTION

[0083] The present invention will be described more clearly and completely below by way of embodiments in conjunction with the accompanying drawings, but the present invention is not limited to the scope of the embodiments.

[0084] Example 1

[0085] like Figure 1-Figure 3 As shown, this embodiment discloses a check valve, which includes a housing 1 and a check assembly 2. The housing 1 has an inlet 11, an outlet 12, and a flow channel 13 connecting the inlet 11 and the outlet 12. The check assembly 2 is installed in the flow channel 13, and is used for the check valve to unidirectionally conduct from the inlet 11 to the outlet 12. The check valve also includes an exhaust valve 3. A through hole 14 is provided on the wall surface of the housing 1. The through hole 14 is located upstream of the check assembly 2. The exhaust valve 3 is installed in the through hole 14. The exhaust valve 3 includes a valve core 31, and the valve core 31 is rotatably connected to the housing 1. When the valve core 31 rotates to the first position, the through hole 14 is opened, and the flow channel 13 is connected to the outside through the through hole 14; when the valve core 31 rotates to the second position, the through hole 14 is closed. The check valve is provided with an exhaust structure upstream of the check structure, and the through hole 14 is opened or closed by rotating the valve core 31 to the first position or the second position, which is used to discharge the gas in the flow channel 13 upstream of the check valve, so that the retained liquid pulled by the check structure is discharged, and it is also convenient to exhaust the centrifugal pump installed upstream of the check valve, thereby improving the efficiency of the centrifugal pump. Moreover, the through hole 14 is opened or closed by rotating the valve core 31, which is simple and convenient to operate.

[0086] like Figure 3 As shown, the valve core 31 includes an end cover 311 and an abutment portion 312, and a valve seat 15 is provided on the inner wall of the through hole 14. When the valve core 31 rotates to the first position, the abutment portion 312 is separated from the valve seat 15, and the through hole 14 is opened; when the valve core 31 rotates to the second position, the abutment portion 312 abuts against the valve seat 15, the end cover 311 is threadedly connected to the raised portion of the housing 1, and the through hole 14 is closed. The abutment portion 312 of the valve core 31 is arranged corresponding to the valve seat 15. When the valve core 31 rotates to the first position, the abutment portion 312 is separated from the valve seat 15, the through hole 14 is opened, and the flow channel 13 is connected to the outside through the through hole 14. When the valve core 31 rotates to the second position, the abutment portion 312 abuts against the valve seat 15, and the valve core 31 closes the through hole 14. The valve core 31 is threadedly connected to the raised portion of the housing 1 through the end cover 311, so that the position of the valve core 31 can be adjusted by rotating the end cover 311 to open and close the through hole 14, which is simple and convenient to operate.

[0087] like Figure 3 As shown, the exhaust valve 3 further includes a sealing ring 32, which is arranged between the abutting portion 312 and the valve seat 15. A groove is arranged on the outer peripheral surface of the abutting portion 312, and the sealing ring 32 is embedded in the groove. The sealing ring 32 is used to seal the gap between the abutting portion 312 and the valve seat 15 to prevent air or liquid leakage at the through hole 14 when the valve core 31 is in the second position. The sealing ring 32 is installed on the valve core 31 and moves synchronously with the valve core 31. Preferably, there are multiple sealing rings 32, and the multiple sealing rings 32 are arranged at intervals along the axial direction of the valve core 31 to improve the sealing effect.

[0088] In other alternative embodiments, the sealing ring may also be installed on the valve seat.

[0089] Preferably, the end of the abutting portion 312 and the inner wall of the valve seat 15 are both provided with chamfers to facilitate the valve core 31 to slide smoothly into or out of the valve seat 15 .

[0090] like Figure 3 As shown, the through hole 14 includes a sealing section 141 and an expansion section 142. The sealing section 141 is arranged close to the valve seat 15, and the expansion section 142 is located outside the sealing section 141. The inner diameter of the sealing section 141 is adapted to the outer diameter of the abutment portion 312, and the inner diameter of the expansion section 142 is larger than the diameter of the valve core 31. The through hole 14 is arranged into the sealing section 141 and the expansion section 142 with different inner diameters. When opening the through hole 14, it is not necessary to completely remove the valve core 31. As long as the valve core 31 is moved from the sealing section 141 to the expansion section 142, the through hole 14 can be opened through the gap between the expansion section 142 and the valve core 31, thereby reducing the sliding stroke of the valve core 31 and simplifying the operation.

[0091] The check assembly includes a second valve core and an elastic component. The inner wall of the valve body is provided with a second valve seat. The second valve core is arranged in the flow channel so as to be movable along its own axial direction. The elastic component biases the second valve core and makes the second valve core abut against the second valve seat in the direction of the fluid. The second valve core abuts against the second valve seat in the direction of the fluid through the elastic force of the elastic component, so that the flow channel is closed. When the fluid flows in from the inlet, when the force of the fluid acting on the second valve core is greater than the elastic force of the elastic component, the second valve core moves away from the second valve seat, the flow channel is opened, and the flow channel is conducted from the inlet to the outlet. When the force of the fluid acting on the second valve core is less than the elastic force of the elastic component or the fluid flows from the outlet to the inlet, the second valve core abuts against the second valve seat, and the flow channel is closed, so that the flow channel is cut off.

[0092] This embodiment also discloses a water purifier, which includes a centrifugal pump and the check valve as described above, and the check valve is installed at the water outlet of the centrifugal pump. The check valve prevents water from flowing back to the centrifugal pump, and is used to protect the centrifugal pump. When gas is trapped between the centrifugal pump and the check valve, the gas can be exhausted by opening the exhaust valve 3 on the check valve, so that the inner cavity of the centrifugal pump is filled with water, thereby improving the working efficiency of the centrifugal pump.

[0093] Example 2

[0094] like Figure 4-Figure 7As shown, this embodiment is basically the same as the embodiment 1, and the difference is that: the housing 1 is provided with a recessed portion 16, the through hole 14 is located in the recessed portion 16, the valve core 31 is embedded in the recessed portion 16 and can rotate relative to the housing 1 along the radial direction of the through hole 14, and the valve core 31 is provided with a through hole 313. When the valve core 31 rotates to the first position, the through hole 313 is at least partially aligned with the through hole 14, the through hole 14 is opened, and the flow channel 13 is connected to the outside through the through hole 14 and the through hole 313; when the valve core 31 rotates to the second position, the through hole 313 is misaligned with the through hole 14, and the through hole 14 is closed. A through hole 313 is provided on the valve core 31. When the valve core 31 rotates to a position where the through hole 313 is at least partially aligned with the through hole 14 (i.e., the first position), the through hole 14 can be opened. When the valve core 31 rotates to a position where the through hole 313 is misaligned with the through hole 14 (i.e., the second position), the valve core 31 covers the through hole 14, and the through hole 14 can be closed. The rotation angle range of the valve core 31 is small, and the volume of the valve core 31 is small, and the valve core 31 does not need to be rotated to a position completely misaligned with the through hole 14. The valve core 31 is embedded in the recessed portion 16 and rotates in the recessed portion 16, so that the exhaust valve has a compact structure.

[0095] like Figure 5 As shown, the inner wall of the recessed portion 16 is provided with a limiting portion 161, and the limiting portion 161 abuts against the outer side of the valve core 31. That is, the edge of the valve core 31 is clamped in the groove formed between the limiting portion 161 and the bottom surface of the recessed portion 16, so that the valve core 31 can rotate in the groove and prevent the valve core 31 from falling out.

[0096] like Figure 5 and Figure 7 As shown, the outer end of the valve core 31 also has a knob 314 protruding outward, which is convenient for manually operating the knob 314 and switching the position of the valve core 31.

[0097] like Figure 5 and Figure 6 As shown, the check valve further includes a sealing ring 32, the bottom surface of the recessed portion 16 has a groove, the groove is arranged around the circumference of the through hole 14, the sealing ring 32 is embedded in the groove, and the outer side of the sealing ring 32 abuts against the bottom surface of the valve core 31. When the valve core 31 is in the second position (i.e., the position where the through hole 14 is closed), the sealing ring 32 is used to seal the gap between the valve core 31 and the housing 1, preventing the check valve from leaking air or liquid through the through hole 14, thereby improving air tightness.

[0098] Of course, in other alternative embodiments, the sealing ring may also be arranged on the inner side of the valve core.

[0099] Example 3

[0100] like Figure 8-11As shown, this embodiment is basically the same as the embodiment 1, and the difference is that: the inner wall of the through hole 14 is provided with a valve seat 15 and a spiral guide groove 17 extending along the axial direction of the valve core 31, the guide groove 17 is located above the valve seat 15, and the outer peripheral surface of the valve core 31 is provided with a raised guide portion 315, and the guide portion 315 is slidably arranged in the guide groove 17. When the valve core 31 rotates to the first position, the abutment portion 312 of the valve core 31 is separated from the valve seat 15, and the through hole 14 is opened; when the valve core 31 rotates to the second position, the abutment portion 312 of the valve core 31 abuts against the valve seat 15, and the through hole 14 is closed. The valve core 31 slides in the spiral guide groove 17 through the guide slide portion 315, thereby realizing the lifting and lowering movement of the valve core 31 relative to the valve seat 15, and then realizing the abutment or separation of the valve core 31 and the valve seat 15, thereby opening or closing the through hole 14. The structure is simple and the operation is simple and convenient. The spiral guide groove 17 can fix the valve core 31 through the guide slide portion 315. The valve core 31 is not easy to swing during the lifting process, so that the opening or closing position of the valve core 31 is accurate.

[0101] like Fig.10 As shown, preferably, there are two guide grooves 17, and the two guide grooves 17 are evenly spaced along the circumferential direction of the valve core 31, and the guide portions 315 are arranged one-to-one with the guide grooves 17 to improve the guide effect between the valve core 31 and the housing 1.

[0102] like Fig.10 As shown, the inner wall of the through hole 14 is also provided with a limiting portion 161, which is located at the upper end of the guide groove 17 and is used to abut the guide groove 315 to limit the rotation angle of the valve core 31 and prevent the guide groove 315 from rotating out of the guide groove 17 to cause structural damage to the guide groove 315 or the guide groove 17.

[0103] like Fig.10 As shown, an exhaust hole 18 penetrating the wall is also provided on the inner wall of the through hole 14, the exhaust hole 18 is located at the upper end of the valve seat 15, and the exhaust hole 18 is communicated with the portion of the through hole 14 located at the upper end of the valve seat 15. When the abutting portion 312 of the valve core 31 is separated from the valve seat 15, the through hole 14 can be communicated with the outside through the exhaust hole 18, which is convenient for exhausting from the side and improving the exhaust effect.

[0104] like Fig. 9 and Fig.11 As shown, a flange 316 is also provided on the outer peripheral surface of the valve core 31, and the flange 316 is adapted to the through hole 14 to form a guide mechanism. When the valve core 31 is lifted or lowered, the flange 316 slides in the through hole 14 to prevent the valve core 31 from swinging and improve the accuracy of the sliding direction of the valve core 31.

[0105] like Fig. 9As shown, preferably, the exhaust valve 3 further includes an outer cover 33, which is sleeved on the valve core 31, and the outer cover 33 is detachably connected to the housing 1. The outer cover 33 is used to protect the valve core 31 and prevent dust from entering the through hole 14. The outer cover 33 is detachably connected to the housing 1, which facilitates the disassembly and assembly of the valve core 31. The distance between the outer cover 33 and the flange 316 is greater than the stroke of the valve core 31 moving in the axial direction, so as to prevent interference between the outer cover 33 and the flange 316 during the rising process of the valve core 31.

[0106] like Fig.11 As shown, the outer end of the valve core 31 also has a knob 314, and the knob 314 passes through the through hole on the outer cover 33 and is exposed from the outer cover 33. The knob 314 is provided to facilitate hand holding to rotate the valve core 31. When the valve core 31 is rotated by the knob 314, the through hole 14 is opened, and the gas in the flow channel is discharged to the outside through the through hole 14 and the through hole on the outer cover 33.

[0107] In the description of this article, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0108] 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. A check valve, comprising a housing and a check assembly, wherein the housing has an inlet, an outlet and a flow channel connecting the inlet and the outlet, the check assembly is installed in the flow channel and is used for the check valve to conduct one-way from the inlet to the outlet, characterized in that: The check valve further comprises an exhaust valve, a through hole is arranged on the wall surface of the shell, the through hole is located upstream of the check assembly, the exhaust valve is installed in the through hole, the exhaust valve comprises a valve core, and the valve core is rotatably connected to the shell; When the valve core rotates to the first position, the through hole is opened, and the flow channel is connected to the outside through the through hole; When the valve core rotates to the second position, the through hole is closed.

2. The check valve according to claim 1, characterized in that: The valve core comprises an end cover and an abutment portion, and the inner wall of the through hole is provided with a valve seat; When the valve core rotates to the first position, the abutment portion is separated from the valve seat, and the through hole is opened; When the valve core rotates to the second position, the abutting portion abuts against the valve seat, the end cover is threadedly connected to the raised portion of the housing, and the through hole is closed.

3. The check valve according to claim 2, characterized in that: The exhaust valve further comprises a sealing ring, which is arranged between the abutting portion and the valve seat. A groove is arranged on the outer peripheral surface of the abutting portion, and the sealing ring is embedded in the groove.

4. The check valve according to claim 2, characterized in that: The end of the abutting portion and the inner wall of the valve seat are both provided with chamfers; And / or, the through hole includes a sealing section and an expansion section, the sealing section is arranged close to the valve seat, the expansion section is located on the outside of the sealing section, the inner diameter of the sealing section is adapted to the outer diameter of the abutment portion, and the inner diameter of the expansion section is larger than the diameter of the valve core.

5. The check valve according to claim 1, characterized in that: The housing is provided with a recessed portion, the through hole is located in the recessed portion, the valve core is embedded in the recessed portion and can rotate relative to the housing along the radial direction of the through hole, and the valve core is provided with a through hole; When the valve core rotates to the first position, the through hole is at least partially aligned with the through hole, the through hole is opened, and the flow channel is connected to the outside through the through hole and the through hole; When the valve core rotates to the second position, the through hole is misaligned with the through hole, and the through hole is closed.

6. The check valve according to claim 5, characterized in that: The inner wall of the recessed portion is provided with a limiting portion, and the limiting portion abuts against the outer side of the valve core; And / or, the outer end of the valve core also has a knob protruding outwards; And / or, the check valve further comprises a sealing ring, the bottom surface of the recessed portion comprises a groove, the groove is arranged around the circumference of the through hole, the sealing ring is embedded in the groove, and the outer side of the sealing ring abuts against the bottom surface of the valve core.

7. The check valve according to claim 1, characterized in that: The inner wall of the through hole is provided with a valve seat and a spiral guide groove extending along the axial direction of the valve core, the guide groove is located above the valve seat, and the outer peripheral surface of the valve core is provided with a raised guide portion, and the guide portion is slidably arranged in the guide groove; When the valve core rotates to the first position, the abutting portion of the valve core is separated from the valve seat, and the through hole is opened; When the valve core rotates to the second position, the abutting portion of the valve core abuts against the valve seat, and the through hole is closed.

8. The check valve according to claim 7, characterized in that: The inner wall of the through hole is further provided with a limiting portion, and the limiting portion is located at the upper end of the guide slide groove and is used to abut against the guide slide portion; And / or, an exhaust hole penetrating the wall surface is further provided on the inner wall of the through hole, the exhaust hole is located at the upper end of the valve seat, and the exhaust hole is communicated with the portion of the through hole located at the upper end of the valve seat.

9. The check valve according to claim 8, characterized in that: A flange is also arranged on the outer peripheral surface of the valve core, and the flange is adapted to the through hole.

10. A water purifier, characterized in that: The water purifier comprises a centrifugal pump and a check valve as described in any one of claims 1 to 9, wherein the check valve is installed at the water outlet end of the centrifugal pump.

Images