Check valve and water purifier

Abstract

The check valve comprises a valve body and a check assembly, the valve body is provided with an inlet, an outlet and a flow channel communicating the inlet with the outlet, the check valve further comprises an exhaust unit, the peripheral face of the valve body is provided with a vent hole communicating the flow channel with the outside, the vent hole is located at the upstream of the check assembly, and the exhaust unit is located at the downstream of the check assembly. The exhaust unit is installed in the vent hole and used for opening or closing the vent hole, the exhaust unit comprises a self-locking switch and a first valve element, one end of the first valve element is connected to the self-locking switch, a first valve seat is arranged on the inner wall of the valve body, and the other end of the first valve element is used for abutting against the first valve seat; the self-locking switch can drive the first valve element to move in the axial direction of the first valve element so that the first valve element can be switched between the state that the first valve element abuts against the first valve seat or the state that the first valve element is away from the first valve seat. The vent hole is opened through the exhaust unit and used for exhausting gas on the upstream of the check valve, so that the centrifugal pump installed on the upstream of the check valve exhausts gas, 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 that the check valve in the prior art is prone to cause air entrapment, 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] 20. The unclamping-dip cam of claim 19, wherein the closure of the present invention is a series of directional controls for the closure of the present invention on a plurality of opposite ends of the closure. The closure of the present invention is a series of directional controls for the closure of the present invention on a plurality of opposite ends of the closure.

[0006] In this solution, if a check valve is installed after the centrifugal pump, when the centrifugal pump evacuates the water from the water tank, air will enter the centrifugal pump, and the check valve will cause air entrapment because there is still residual liquid upstream of the check assembly of the check valve, and the gravity of the retained liquid pulls the check assembly. In this case, the centrifugal pump cannot discharge the air between the check valve and the centrifugal pump. The check valve is provided with an exhaust unit upstream of the check assembly, and the vent is opened through the exhaust unit to discharge the gas upstream of the check valve, so that the retained liquid pulled by the check assembly is discharged, and then the centrifugal pump installed upstream of the check valve is exhausted, thereby improving the efficiency of the centrifugal pump. Specifically, the self-locking switch is used to drive the first valve core to move to realize the opening or closing of the vent. When the first valve core is away from the first valve seat, the air hole is opened, and when the first valve core abuts against the first valve seat, the air hole is closed. In addition, the self-locking switch has a self-locking function. When the first valve core is away from the first valve seat or abuts against the first valve seat, the self-locking switch can lock the position of the first valve core to prevent the position of the first valve core from changing at will, resulting in the opening or closing state of the inflation hole being switched. The moving position of the first valve core can only be switched by pressing the self-locking switch again. The operation is simple and convenient.

[0007] Preferably, the self-locking switch comprises:

[0008] A housing having a vertical slide extending in a vertical direction;

[0009] A slider, slidably disposed on the vertical slideway, the slider having an annular slideway, a distal inner side wall of the annular slideway having a clamping groove, and the first valve core is connected to the slider;

[0010] A swing rod, wherein a first end of the swing rod is hinged to the housing and is located below the annular slideway, and a second end of the swing rod is slidably disposed on the annular slideway;

[0011] An elastic element, two ends of which are respectively connected to the slider and the housing, and exerts a force to move the slider away from the swing rod;

[0012] When the slider is pressed for the first time, the second end slides along the annular slideway to the slot and is locked in the slot;

[0013] When the slider is pressed for the second time, the second end slides along the annular slideway to the proximal starting point of the annular slideway.

[0014] In this solution, the slider slides up and down in the vertical slideway on the shell, thereby driving the first valve core to move in the vertical direction. When the slider is pressed for the first time, the slider overcomes the elastic force of the elastic element and moves in the direction close to the rocker arm, and the second end of the rocker arm slides to the side of the far end relative to the slider in the annular slideway. After the first pressing is completed and the slider is released, the slider moves in the direction away from the rocker arm under the action of the elastic element, so that the second end of the rocker arm is clamped in the slot. At this time, the slider drives the first valve core to abut against the first valve seat and close the vent. When the slider is pressed for the second time, the second end of the rocker arm moves to the far end of the annular slideway relative to the slider, and the second end escapes from the slot and slides along the annular guide groove to the other side of the far end. After the second pressing is completed and the slider is released, the second end slides along the annular slideway to the near end starting point. At this time, the slider drives the first valve core away from the first valve seat and opens the vent.

[0015] Preferably, the outer side wall of the upper end of the annular slide has a partition protruding into the annular slide, and the partition is located above the clamping groove.

[0016] In the present solution, the partition is used to separate the far end of the annular slide into a two-part structure, and the two-part structure is respectively used to guide the second end of the rocker arm to slide into the slot from one side of the partition and slide out of the slot from the other side of the partition, so that the second end of the rocker arm can slide back and forth in the annular slide under the action of the elastic element, thereby preventing the rocker arm from getting stuck at the far end of the annular slide.

[0017] Preferably, the inner side wall of the lower end of the annular slideway is provided with a chamfer.

[0018] In this solution, the above-mentioned structural setting is adopted to facilitate the second end of the swing rod to slide in from one side of the proximal starting point of the annular slide and slide out from the other side of the proximal starting point of the annular slide, thereby preventing the swing rod from getting stuck at the proximal end of the annular slide.

[0019] Preferably, the first valve core includes a rod portion and an abutment portion, the rod portion is fixedly connected to the slider, and the abutment portion is used to abut against the first valve seat.

[0020] In this solution, the rod is fixedly connected to the slider, and the slider installs and fixes the first valve core. The slider slides in the direction of the vertical slideway, and is fixedly connected to the slider through the rod, so that the slider drives the abutment part through the rod to accurately abut the first valve seat, thereby improving the accuracy of the movement of the first valve core.

[0021] Preferably, the exhaust unit further comprises a first sealing ring, the first sealing ring is arranged between the first valve seat and the abutting portion, a groove is arranged on the abutting portion, and the first sealing ring is embedded in the groove;

[0022] And / or, a pressing piece is connected to the rod.

[0023] In this solution, the first sealing ring is used to seal the gap between the abutting portion and the first valve seat. The first sealing ring is fixed to the abutting portion through a groove, and the first sealing ring moves synchronously with the abutting portion. In other alternative solutions, the first sealing ring can also be fixed to the first valve seat. By arranging a pressing piece on the rod, it is convenient to manually operate the pressing piece to adjust the moving position of the slider and the first valve core connected to the slider, thereby adjusting the opening or closing state of the vent hole.

[0024] Preferably, a ventilation groove is provided on the rod portion, one end of the ventilation groove is provided close to the abutting portion, and the other end of the ventilation groove is extended along the length direction of the rod portion.

[0025] In this solution, when the abutting portion is away from the first valve seat and penetrates deep into the flow channel, the flow channel is communicated with the outside through the vent groove.

[0026] In other alternative solutions, when the abutting portion is away from the first valve seat and located outside the first valve seat, the vent hole is communicated with the outside and is directly opened.

[0027] Preferably, the valve body includes an outer shell and a mounting shell, the mounting shell is embedded in the outer shell, the vent is arranged in the middle of the mounting shell, the first valve seat is arranged on the inner wall of the mounting shell, and the self-locking switch is installed on the outer shell through the mounting shell.

[0028] In this solution, by providing a mounting shell, it is convenient to install the self-locking switch and the first valve core, simplifying the structure of the housing and increasing the installation speed.

[0029] Preferably, a second sealing ring is provided between the mounting shell and the outer shell.

[0030] In this solution, the second sealing ring is used to seal the gap between the outer shell and the mounting shell to improve the sealing effect.

[0031] A water purifier comprises the check valve as described above.

[0032] In this solution, the water purifier also includes a centrifugal pump, and the check valve is installed at the outlet end 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 opening and closing unit 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.

[0033] 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.

[0034] The positive and progressive effect of the utility model is that the check valve is provided with an exhaust unit upstream of the check assembly, and the vent is opened by the exhaust unit to discharge the gas upstream of the check valve, so that the retained liquid pulled by the check assembly is discharged, and then the centrifugal pump installed upstream of the check valve is exhausted, thereby improving the efficiency of the centrifugal pump. Specifically, the self-locking switch is used to drive the first valve core to move to realize the opening or closing of the vent. When the first valve core is away from the first valve seat, the vent is opened, and when the first valve core is in contact with the first valve seat, the vent is closed, and the self-locking switch has a self-locking function. When the first valve core is away from the first valve seat or in contact with the first valve seat, the self-locking switch can lock the position of the first valve core to prevent the position of the first valve core from changing arbitrarily, resulting in the opening or closing state of the inflation hole being switched. Only by pressing the self-locking switch again can the moving position of the first valve core be switched, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 The structure of the check valve of a preferred embodiment of the utility model is shown in FIG. Figure 1 .

[0036] Figure 2 The structure of the check valve of a preferred embodiment of the utility model is shown in FIG. Figure 2 .

[0037] Figure 3 for Figure 2 Sectional view along line AA.

[0038] Figure 4 It is a schematic structural diagram of an exhaust unit according to a preferred embodiment of the utility model.

[0039] Figure 5 The figure is a schematic structural diagram of a self-locking switch according to a preferred embodiment of the present utility model.

[0040] Figure 6 for Figure 5 Schematic diagram of the internal structure of the self-locking switch.

[0041] Description of reference numerals:

[0042] Valve body 1

[0043] Housing 101

[0044] Installation Shell 102

[0045] Import 11

[0046] Exit 12

[0047] Runner 13

[0048] Ventilation holes 14

[0049] First valve seat 15

[0050] Second valve seat 16

[0051] Check component 2

[0052] Second valve core 21

[0053] Elastic member 22

[0054] Exhaust unit 3

[0055] Self-locking switch 31

[0056] Housing 311

[0057] Vertical slide 3111

[0058] Slider 312

[0059] Circular slide 3121

[0060] Card slot 3122

[0061] Remote 3123

[0062] Proximal 3124

[0063] Partition 3125

[0064] Chamfer 3126

[0065] Swing rod 313

[0066] First End 3131

[0067] Second end 3132

[0068] Elastic element 314

[0069] First valve core 32

[0070] Rod 321

[0071] Pressing piece 3211

[0072] Ventilation slot 3212

[0073] Contact portion 322

[0074] First sealing ring 33

[0075] Second sealing ring 4 DETAILED DESCRIPTION

[0076] 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.

[0077] This embodiment discloses a check valve and a water purifier. Figure 1-Figure 6As shown, the check valve comprises a valve body 1 and a check assembly 2. The valve body 1 has an inlet 11 and 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 to allow the check valve to conduct unidirectionally from the inlet 11 to the outlet 12. The check valve also includes an exhaust unit 3. A vent 14 connecting the flow channel 13 with the outside is provided on the outer peripheral surface of the valve body 1. The vent 14 is located upstream of the check assembly 2. The exhaust unit 3 is installed on the vent 14 for opening or closing the vent 14. The exhaust unit 3 includes a self-locking switch 31 and a first valve core 32. One end of the first valve core 32 is connected to the self-locking switch 31. A first valve seat 15 is provided on the inner wall of the valve body 1. The other end of the first valve core 32 is used to abut the first valve seat 15. By pressing the self-locking switch 31, the self-locking switch 31 can drive the first valve core 32 to move along the axial direction of the first valve core 32, so that the first valve core 32 switches between the two states of abutting the first valve seat 15 or away from the first valve seat 15. When a check valve is used after a centrifugal pump, after the centrifugal pump evacuates the water from the water tank, air will enter the centrifugal pump, and the check valve will cause air entrapment because there is still residual liquid upstream of the check assembly 2 of the check valve, and the gravity of the retained liquid pulls the check assembly 2. In this case, the centrifugal pump cannot discharge the air between the check valve and the centrifugal pump. The check valve is provided with an exhaust unit 3 upstream of the check assembly 2, and the vent 14 is opened by the exhaust unit 3 to discharge the gas upstream of the check valve, so that the retained liquid pulled by the check assembly 2 is discharged, and then the centrifugal pump installed upstream of the check valve is exhausted, thereby improving the efficiency of the centrifugal pump. In this embodiment, specifically, the self-locking switch 31 is used to drive the first valve core 32 to move, so as to realize the opening or closing of the vent 14. When the first valve core 32 is away from the first valve seat 15, the vent hole 14 is opened, and when the first valve core 32 abuts against the first valve seat 15, the vent hole 14 is closed. In addition, the self-locking switch 31 has a self-locking function. When the first valve core 32 is away from the first valve seat 15 or abuts against the first valve seat 15, the self-locking switch 31 can lock the position of the first valve core 32 to prevent the position of the first valve core 32 from changing at will, resulting in the opening or closing state of the inflation hole being switched. The moving position of the first valve core 32 can be switched only by pressing the self-locking switch 31 again. The operation is simple and convenient.

[0078] like Figure 5 and Figure 6As shown, the self-locking switch 31 includes a shell 311, a slider 312, a rocker rod 313 and an elastic element 314. The shell 311 has a vertical slide 3111 extending in the vertical direction. The slider 312 is slidably arranged on the vertical slide 3111. The slider 312 has an annular slide 3121. The inner wall of the distal end 3123 of the annular slide 3121 has a slot 3122. The first valve core 32 is connected to the slider 312. The first end 3131 of the rocker rod 313 is hinged to the shell 311 and is located below the annular slide 3121. The second end 3132 of the rocker rod 313 is slidably arranged on the annular slide 3121. The two ends of the elastic element 314 are respectively connected to the slider 312 and the shell 311, and a force is applied to move the slider 312 away from the rocker rod 313. When the slider 312 is pressed for the first time, the second end 3132 slides along the annular slideway 3121 to the clamping groove 3122 and is clamped in the clamping groove 3122; when the slider 312 is pressed for the second time, the second end 3132 slides along the annular slideway 3121 to the starting point of the proximal end 3124 of the annular slideway 3121. The slider 312 slides up and down in the vertical slideway 3111 on the housing 311, thereby driving the first valve core 32 to move in the vertical direction. When the slider 312 is pressed for the first time, the slider 312 overcomes the elastic force of the elastic element 314 and moves toward the direction close to the rocker arm 313 (the slider 312 moves downward), and the second end 3132 of the rocker arm 313 slides to the side of the distal end 3123 in the annular slideway 3121 relative to the slider 312. After the first pressing is completed and the slider 312 is released, the slider 312 moves away from the rocker arm 313 (the slider 312 moves upward) under the action of the elastic element 314, so that the second end 3132 of the rocker arm 313 is clamped in the clamping groove 3122, locking the position of the slider 312. At this time, the slider 312 drives the first valve core 32 to abut against the first valve seat 15, closing the air vent 14. When the slider 312 is pressed for the second time, the slider 312 moves downward, and the second end 3132 of the rocker arm 313 moves toward the distal end 3123 of the annular slideway 3121 relative to the slider 312, and the second end 3132 disengages from the slot 3122 and slides along the annular guide slot to the other side of the distal end 3123; after the second pressing is completed and the slider 312 is released, the slider 312 moves upward, and the second end 3132 slides along the annular slideway 3121 to the starting point of the proximal end 3124; at this time, the slider 312 drives the first valve core 32 away from the first valve seat 15, opening the vent 14; the second end 3132 of the rocker arm 313 slides one circle in the annular slideway 3121, completing a cycle of opening and closing of the self-locking switch; and so on, the second end 3132 of the rocker arm 313 slides reciprocatingly in the annular slideway 3121.

[0079] like Figure 6As shown, the outer side wall of the upper end of the annular slide 3121 has a partition 3125 protruding into the annular slide 3121, and the partition 3125 is located above the slot 3122. The partition 3125 is used to separate the distal end 3123 of the annular slide 3121 into two parts, and the two parts are used to guide the second end 3132 of the swing rod 313 to slide into the slot 3122 from one side of the partition 3125 and slide out of the slot 3122 from the other side of the partition 3125, so that the second end 3132 of the swing rod 313 can slide back and forth in the annular slide 3121 under the action of the elastic element 314, so as to prevent the swing rod 313 from getting stuck at the distal end 3123 of the annular slide 3121.

[0080] like Figure 6 As shown, the inner wall of the lower end of the annular slide 3121 is provided with a chamfer 3126, which facilitates the second end 3132 of the rocker arm 313 to slide in from one side of the starting point of the proximal end 3124 of the annular slide 3121 and slide out from the other side of the starting point of the proximal end 3124 of the annular slide 3121, thereby preventing the rocker arm 313 from getting stuck at the proximal end 3124 of the annular slide 3121.

[0081] like Figure 3 and Figure 4 As shown, the first valve core 32 includes a rod 321 and an abutting portion 322, the rod 321 is fixedly connected to the slider 312, and the abutting portion 322 is used to abut the first valve seat 15. The rod 321 is fixedly connected to the slider 312, and the slider 312 installs and fixes the first valve core 32. The slider 312 slides in the setting direction of the vertical slideway 3111, and is fixedly connected to the slider 312 through the rod 321, so that the slider 312 drives the abutting portion 322 through the rod 321 to accurately abut the first valve seat 15, thereby improving the accuracy of the movement of the first valve core 32.

[0082] like Figure 3 As shown, the exhaust unit 3 further includes a first sealing ring 33, which is disposed between the first valve seat 15 and the abutting portion 322. A groove is provided on the abutting portion 322, and the first sealing ring 33 is embedded in the groove. The first sealing ring 33 is used to seal the gap between the abutting portion 322 and the first valve seat 15. The first sealing ring 33 is fixed to the abutting portion 322 through the groove, and the first sealing ring 33 moves synchronously with the abutting portion 322. In other alternative embodiments, the first sealing ring may also be fixed to the first valve seat.

[0083] like Figure 1-Figure 4 As shown, a pressing member 3211 is connected to the rod 321. The pressing member 3211 is arranged on the rod 321, so as to manually operate the pressing member 3211, adjust the moving position of the slider 312 and the first valve core 32 connected to the slider 312, and then adjust the opening or closing state of the vent hole 14.

[0084] like Figure 4 As shown, a vent groove 3212 is provided on the rod portion 321, one end of the vent groove 3212 is provided close to the abutting portion 322, and the other end of the vent groove 3212 is extended along the length direction of the rod portion 321. When the abutting portion 322 is away from the first valve seat 15 and penetrates into the flow channel 13, the flow channel 13 is connected to the outside through the vent groove 3212.

[0085] In other alternative embodiments, when the abutting portion is away from the first valve seat and located outside the first valve seat, the vent hole is communicated with the outside and is directly opened.

[0086] like Figure 3 As shown, the valve body 1 includes a housing 101 and a mounting housing 102, the mounting housing 102 is embedded in the housing 101, the vent hole 14 is provided in the middle of the mounting housing 102, the first valve seat 15 is provided on the inner wall of the mounting housing 102, and the self-locking switch 31 is installed on the housing 101 through the mounting housing 102. By providing the mounting housing 102, it is convenient to install the self-locking switch 31 and the first valve core 32, simplify the structure of the housing 101, and improve the installation speed. At the same time, the first valve core 32 slides in the mounting housing 102 and does not directly slide with the housing 101 by friction, so the sliding is smoother, and the structure of the housing 101 is also protected, and the service life is extended.

[0087] like Figure 3 As shown, a second sealing ring 4 is provided between the mounting shell 102 and the outer shell 101. The second sealing ring 4 is used to seal the gap between the outer shell 101 and the mounting shell 102 to improve the sealing effect.

[0088] like Figure 3 As shown, the check assembly 2 includes a second valve core 21 and an elastic component 22, and the inner wall of the valve body 1 is provided with a second valve seat 16. The second valve core 21 is arranged in the flow channel 13 so as to be movable along its own axial direction. The elastic component 22 biases the second valve core 21 and makes the second valve core 21 abut against the second valve seat 16 in the direction of the fluid. The second valve core 21 abuts against the second valve seat 16 in the direction of the fluid by the elastic force of the elastic component 22, so that the flow channel 13 is closed. The fluid flows in from the inlet 11. When the force of the fluid acting on the second valve core 21 is greater than the elastic force of the elastic component 22, the second valve core 21 moves away from the second valve seat 16, and the flow channel 13 is opened, so that the flow channel 13 is conducted from the inlet 11 to the outlet 12. When the force of the fluid acting on the second valve core 21 is smaller than the elastic force of the elastic component 22 or the fluid flows from the outlet 12 to the inlet 11 , the second valve core 21 abuts against the second valve seat 16 , and the flow channel 13 is closed, thereby achieving cutoff of the flow channel 13 .

[0089] A water purifier includes the check valve as described above. The water purifier also includes a centrifugal pump, the check valve is installed at the outlet end of the centrifugal pump, and 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 opening and closing unit 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.

[0090] 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.

[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. A check valve, comprising a valve body and a check assembly, wherein the valve body has an inlet and an outlet and a flow channel connecting the inlet and the outlet, characterized in that: The check valve also includes an exhaust unit, a vent hole connecting the flow channel with the outside is arranged on the outer peripheral surface of the valve body, the vent hole is located upstream of the check assembly, the exhaust unit is installed on the vent hole, and is used to open or close the vent hole, the exhaust unit includes a self-locking switch and a first valve core, one end of the first valve core is connected to the self-locking switch, a first valve seat is arranged on the inner wall of the valve body, and the other end of the first valve core is used to abut the first valve seat, and the self-locking switch can drive the first valve core to move along the axial direction of the first valve core, so that the first valve core switches between two states of abutting the first valve seat or away from the first valve seat.

2. The check valve according to claim 1, characterized in that: The self-locking switch comprises: A housing having a vertical slide extending in a vertical direction; A slider, slidably disposed on the vertical slideway, the slider having an annular slideway, a distal inner side wall of the annular slideway having a clamping groove, and the first valve core is connected to the slider; A swing rod, wherein a first end of the swing rod is hinged to the housing and is located below the annular slideway, and a second end of the swing rod is slidably disposed on the annular slideway; An elastic element, two ends of which are respectively connected to the slider and the housing, and exerts a force to move the slider away from the swing rod; When the slider is pressed for the first time, the second end slides along the annular slideway to the slot and is locked in the slot; When the slider is pressed for the second time, the second end slides along the annular slideway to the proximal starting point of the annular slideway.

3. The check valve according to claim 2, characterized in that: The outer side wall at the distal end of the annular slide has a partition protruding into the annular slide, and the partition is located above the clamping groove.

4. The check valve according to claim 2, characterized in that: The inner side wall of the proximal end of the annular slideway is provided with a chamfer.

5. The check valve according to claim 2, characterized in that: The first valve core includes a rod portion and an abutment portion, the rod portion is fixedly connected to the slider, and the abutment portion is used to abut against the first valve seat.

6. The check valve according to claim 5, characterized in that: The exhaust unit further comprises a first sealing ring, which is arranged between the first valve seat and the abutting portion, the abutting portion is provided with a groove, and the first sealing ring is embedded in the groove; And / or, a pressing piece is connected to the rod.

7. The check valve according to claim 5, characterized in that: The rod portion is provided with a ventilation groove, one end of the ventilation groove is arranged close to the abutting portion, and the other end of the ventilation groove is extended along the length direction of the rod portion.

8. The check valve according to claim 1, characterized in that: The valve body comprises an outer shell and a mounting shell, the mounting shell is embedded in the outer shell, the vent hole is arranged in the middle of the mounting shell, the first valve seat is arranged on the inner wall of the mounting shell, and the self-locking switch is installed on the outer shell through the mounting shell.

9. The check valve according to claim 8, characterized in that: A second sealing ring is arranged between the mounting shell and the outer shell.

10. A water purifier, characterized in that: The water purifier comprises a check valve as described in any one of claims 1-9.

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