Check valve and water purifier

Abstract

The check valve comprises a shell and a check structure, the shell is provided with an inlet, an outlet and a flow channel communicated with the inlet and the outlet, the check valve further comprises an exhaust structure, a mounting hole is formed in the wall face of the shell, the mounting hole is located on the upstream of the check structure, the mounting hole penetrates through the shell in the radial direction of the shell, and the check structure is arranged in the shell. The exhaust structure is mounted in the mounting hole and comprises a push rod, the push rod penetrates through the mounting hole and is slidably arranged in the mounting hole in the radial direction, and at least one end of the push rod is exposed out of the outer wall surface of the shell; when the push rod slides to a first position, the mounting hole is opened, and the runner is communicated with the outside through the mounting hole; and when the push rod slides to the second position, the mounting hole is closed. According to the check valve, the exhaust structure is arranged on the upstream of the check structure, the push rod is operated to slide to the first position or the second position, opening or closing of the mounting hole is achieved, and gas in an upstream flow channel of the check valve is exhausted.

Description

Technical Field

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

[0002] 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 in reverse, 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 purifiers, water heaters, 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 a check valve. However, in some cases, when the check valve prevents the reverse flow of water, it also brings about the problem of air entrapment upstream of the check structure 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 water entrapment and air problem. 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 shell and a check structure, wherein the shell has an inlet, an outlet and a flow channel connecting the inlet and the outlet, and the check valve also includes an exhaust structure, a mounting hole is provided on the wall surface of the shell, the mounting hole is located upstream of the check structure, the mounting hole penetrates the shell in the radial direction of the shell, the exhaust structure is installed in the mounting hole, the exhaust structure comprises a push rod, the push rod is penetrated in the mounting hole and slidably arranged in the mounting hole in the radial direction, and at least one end of the push rod is exposed from the outer wall surface of the shell;

[0006] When the push rod slides to the first position, the mounting hole is opened, and the flow channel is connected to the outside through the mounting hole;

[0007] When the push rod slides to the second position, the mounting hole is closed.

[0008] In this solution, the check valve is provided with an exhaust structure upstream of the check structure, and the installation hole is opened or closed by operating the push rod to slide 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. Since at least one end of the push rod is exposed from the housing, it is convenient to hold and operate the push rod by hand, thereby changing the position of the push rod to open or close the installation hole, and the operation is simple and convenient.

[0009] Preferably, the inner wall of the shell is provided with a first valve seat and a second valve seat, the push rod is provided with a first abutting portion and a second abutting portion, the first abutting portion is provided corresponding to the first valve seat, and the second abutting portion is provided corresponding to the second valve seat.

[0010] When the push rod slides to the first position, the first abutting portion is misaligned with the first valve seat, and the second abutting portion is misaligned with the second valve seat;

[0011] When the push rod slides to the second position, the first abutting portion abuts against the first valve seat, and the second abutting portion abuts against the second valve seat.

[0012] In this solution, the first abutting portion is arranged corresponding to the first valve seat, and the second abutting portion is arranged corresponding to the second valve seat. When the first abutting portion abuts against the first valve seat and the second abutting portion abuts against the second valve seat, the mounting hole is closed. When the first abutting portion is misaligned with the first valve seat and the second abutting portion is misaligned with the second valve seat, the mounting hole connects the flow channel with the outside. Preferably, one end of the mounting hole connects the flow channel, or both ends of the mounting hole connect the flow channel with the outside respectively, so as to improve the exhaust efficiency.

[0013] Preferably, the push rod is provided with a ventilation groove, and the ventilation groove is extended along the axial direction of the push rod.

[0014] When the push rod slides to the first position, the flow channel is communicated with the outside through the vent groove.

[0015] In this solution, a vent groove is provided on the push rod, which is connected to the outside through the vent groove, and there is no need to provide an abutment portion with a variable diameter on the push rod, so that the push rod can slide smoothly in the mounting hole. Preferably, an abutment portion with a variable diameter is provided on the push rod, so that when the abutment portion is misaligned with the valve seat, the mounting hole can be opened.

[0016] Preferably, the exhaust structure further includes a first sealing ring and a second sealing ring, wherein the first sealing ring is installed between a first abutting portion of the push rod and the first valve seat, and the second sealing ring is installed between a second abutting portion of the push rod and the second valve seat.

[0017] In this solution, the first sealing ring is used to seal the gap between the first abutting portion and the first valve seat, and the second sealing ring is used to seal the gap between the second abutting portion and the second valve seat, to prevent air or liquid leakage at the mounting hole when the push rod is in the second position. Preferably, the first sealing ring is mounted on the push rod or on the first valve seat, and the second sealing ring is mounted on the push rod or on the second valve seat.

[0018] Preferably, a first mounting groove is provided on the outer circumferential surface of the first abutting portion, the first sealing ring is embedded in the first mounting groove, and a second mounting groove is provided on the outer circumferential surface of the second abutting portion, the second sealing ring is embedded in the second mounting groove.

[0019] In this solution, the first sealing ring is embedded in the first installation groove, and the second sealing ring is embedded in the second installation groove. The first sealing ring and the second sealing ring move synchronously with the push rod to improve the sealing effect.

[0020] Preferably, the exhaust structure further comprises a locking mechanism, wherein the locking mechanism is disposed between the housing and the push rod, and the locking mechanism can fix the push rod in the first position or the second position.

[0021] In this solution, the locking mechanism is used to fix the push rod and keep the push rod in the first position or the second position, preventing the push rod from sliding randomly, thereby changing the opening and closing state of the mounting hole, and improving the reliability of the exhaust structure.

[0022] Preferably, the locking mechanism includes a push rod and an elastic element, the push rod is slidably arranged on the outer shell along the radial direction of the push rod, the two ends of the elastic element are respectively connected to the push rod and the outer shell, the push rod is provided with two positioning grooves, one positioning groove corresponds to the first position, and the other positioning groove corresponds to the second position, and the elastic element applies a force so that one end of the push rod is embedded in the positioning groove.

[0023] In this solution, under the action of the elastic element, if the push rod is pressed into the positioning groove corresponding to the first position, the push rod locks the push rod in the first position, so that the exhaust structure remains in the state where the mounting hole is opened. Under the action of the elastic element, if the push rod is pressed into the positioning groove corresponding to the second position, the push rod locks the push rod in the second position, so that the exhaust structure remains in the state where the mounting hole is closed.

[0024] Preferably, the end of the push rod is provided with a chamfer, and the edge of the positioning groove is provided with a chamfer, so that the push rod can slide from one guide groove to another guide groove through the movement of the push rod.

[0025] Preferably, the exhaust structure further includes a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively detachably connected to the outer shell and are located at both ends of the mounting hole, and both ends of the push rod respectively pass through and are slidably disposed on the first end cover and the second end cover.

[0026] In this solution, by providing the first end cover and the second end cover, the push rod slides in the holes on the first end cover and the second end cover, which is convenient for fixing the push rod. The first end cover and the second end cover are detachably connected to the housing, which is convenient for disassembly and maintenance of the push rod.

[0027] Preferably, a through groove is provided on the outer circumferential surface of the push rod, and when the push rod slides to the second position, the through groove is located in the flow channel for connecting the flow channels on both sides of the push rod.

[0028] In this solution, a through groove is provided on the outer peripheral surface of the push rod to reduce the space occupied by the push rod on the flow channel, increase the aperture of the flow channel when passing through the push rod, and reduce the influence of the push rod on the fluid.

[0029] 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 water purifier.

[0030] 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 exhaust structure 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.

[0031] 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.

[0032] 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 installation hole is opened or closed by operating the push rod to slide 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. Since at least one end of the push rod is exposed from the housing, it is convenient to hold and operate the push rod by hand, thereby changing the position of the push rod to open or close the installation hole, and the operation is simple and convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The structure of the check valve of a preferred embodiment of the utility model is shown in FIG. Figure 1 .

[0034] Figure 2 The structure of the check valve of a preferred embodiment of the utility model is shown in FIG. Figure 2 .

[0035] Figure 3 for Figure 2 Sectional view along line AA.

[0036] Figure 4 The figure is a schematic structural diagram of a push rod of a check valve according to a preferred embodiment of the utility model.

[0037] Description of reference numerals:

[0038] Shell 1

[0039] Import 11

[0040] Exit 12

[0041] Runner 13

[0042] Mounting holes 14

[0043] First valve seat 15

[0044] Second valve seat 16

[0045] The third valve seat 17

[0046] Backstop structure 2

[0047] Spool 21

[0048] Elastic member 22

[0049] Exhaust structure 3

[0050] Putter 31

[0051] The first contact portion 311

[0052] First installation slot 3111

[0053] The second contact portion 312

[0054] Second installation slot 3121

[0055] Ventilation slot 313

[0056] Through slot 314

[0057] Positioning slot 315

[0058] First sealing ring 32

[0059] Second sealing ring 33

[0060] Locking mechanism 34

[0061] Ejector 341

[0062] Elastic element 342

[0063] First end cap 35

[0064] Second end cover 36

[0065] Radial direction 100 DETAILED DESCRIPTION

[0066] 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.

[0067] like Figure 1-Figure 4As shown, this embodiment discloses a check valve, which includes a housing 1 and a check structure 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 structure 2 is used for the check valve to unidirectionally conduct from the inlet 11 to the outlet 12. The check valve also includes an exhaust structure 3. A mounting hole 14 is provided on the wall surface of the housing 1. The mounting hole 14 is located upstream of the check structure 2. The mounting hole 14 penetrates the housing 1 along the radial direction 100 of the housing 1. The exhaust structure 3 is installed in the mounting hole 14. The exhaust structure 3 includes a push rod 31. The push rod 31 is penetrated in the mounting hole 14 and slidably arranged in the mounting hole 14 along the radial direction 100. At least one end of the push rod 31 is exposed to the outer wall surface of the housing 1. When the push rod 31 slides to the first position, the mounting hole 14 is opened, and the flow channel 13 is connected to the outside through the mounting hole 14; when the push rod 31 slides to the second position, the mounting hole 14 is closed. In this embodiment, the check valve is provided with an exhaust structure 3 upstream of the check structure 2, and the installation hole 14 is opened or closed by operating the push rod 31 to slide 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 2 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. Since at least one end of the push rod 31 is exposed from the housing 1, it is convenient to hold and operate the push rod 31 by hand, and the installation hole 14 is opened or closed by changing the position of the push rod 31, which is simple and convenient to operate.

[0068] like Figure 3 and Figure 4 As shown, the inner wall of the housing 1 is provided with a first valve seat 15 and a second valve seat 16, and the push rod 31 is provided with a first abutting portion 311 and a second abutting portion 312, wherein the first abutting portion 311 is provided corresponding to the first valve seat 15, and the second abutting portion 312 is provided corresponding to the second valve seat 16. When the push rod 31 slides to the first position, the first abutting portion 311 is misaligned with the first valve seat 15, and the second abutting portion 312 is misaligned with the second valve seat 16, so that the mounting hole 14 connects the flow channel 13 to the outside. When the push rod 31 slides to the second position, the first abutting portion 311 abuts against the first valve seat 15, and the second abutting portion 312 abuts against the second valve seat 16, so that the mounting hole 14 is closed.

[0069] In this embodiment, one end of the mounting hole 14 connects the flow channel 13. In other alternative embodiments, both ends of the mounting hole connect the flow channel to the outside to improve the exhaust efficiency.

[0070] like Figure 4As shown, specifically in this embodiment, a vent groove 313 is provided on the push rod 31, one end of the vent groove 313 is provided close to the first abutment portion 311, and the other end of the vent groove 313 extends to the end surface along the axial direction of the push rod 31. When the push rod 31 slides to the first position, the flow channel 13 is connected to the outside through the vent groove 313. By connecting to the outside through the vent groove 313, there is no need to provide an abutment portion with a variable diameter on the push rod 31, so that the push rod 31 can slide smoothly in the mounting hole 14.

[0071] In other alternative embodiments, an abutment portion with a variable diameter is provided on the push rod 31 so that the mounting hole 14 can be opened when the abutment portion is misaligned with the valve seat.

[0072] like Figure 3 and Figure 4 As shown, the exhaust structure 3 also includes a first sealing ring 32 and a second sealing ring 33. The first sealing ring 32 is installed between the first abutting portion 311 of the push rod 31 and the first valve seat 15. The first sealing ring 32 is used to seal the gap between the first abutting portion 311 and the first valve seat 15 to improve the sealing effect and prevent the push rod 31 from leaking gas or liquid from one end of the mounting hole 14 when the push rod 31 is in the second position. The second sealing ring 33 is installed between the second abutting portion 312 of the push rod 31 and the second valve seat 16. The second sealing ring 33 is used to seal the gap between the second abutting portion 312 and the second valve seat 16 to prevent the push rod 31 from leaking gas or liquid from the other end of the mounting hole 14 when the push rod 31 is in the second position. Preferably, the first sealing ring 32 is installed on the push rod 31 or on the first valve seat 15, and the second sealing ring 33 is installed on the push rod 31 or on the second valve seat 16.

[0073] like Figure 3 and Figure 4 As shown, specifically in the present embodiment, a first mounting groove 3111 is provided on the outer peripheral surface of the first abutting portion 311, the first sealing ring 32 is embedded in the first mounting groove 3111, a second mounting groove 3121 is provided on the outer peripheral surface of the second abutting portion 312, the second sealing ring 33 is embedded in the second mounting groove 3121, the first sealing ring 32 and the second sealing ring 33 move synchronously with the push rod 31 to improve the sealing effect.

[0074] like Figure 3 As shown, the exhaust structure 3 further includes a locking mechanism 34, which is disposed between the housing 1 and the push rod 31, and the locking mechanism 34 can fix the push rod 31 in the first position or the second position. The locking mechanism 34 is used to fix the push rod 31 and keep the push rod 31 in the first position or the second position, thereby preventing the push rod 31 from sliding at will, thereby changing the opening and closing state of the mounting hole 14, and improving the reliability of the exhaust structure 3.

[0075] like Figure 3As shown, specifically in this embodiment, the locking mechanism 34 includes a push rod 341 and an elastic element 342. The push rod 341 is slidably disposed on the housing 1 along the radial direction 100 of the push rod 31. The two ends of the elastic element 342 are respectively connected to the push rod 31 and the housing 1. Two positioning grooves 315 are provided on the push rod 31. One positioning groove 315 corresponds to the first position, and the other positioning groove 315 corresponds to the second position. The elastic element 342 exerts a force to make one end of the push rod 31 embedded in the positioning groove 315. Under the action of the elastic element 342, if the push rod 341 is pressed into the positioning groove 315 corresponding to the first position, the push rod 341 locks the push rod 31 in the first position, so that the exhaust structure 3 is kept in the state where the mounting hole 14 is opened. Under the action of the elastic element 342, if the push rod 341 is pressed into the positioning groove 315 corresponding to the second position, the push rod 341 locks the push rod 31 in the second position, so that the exhaust structure 3 is kept in the state where the mounting hole 14 is closed.

[0076] Preferably, the end of the push rod 31 is provided with a chamfer, and the edge of the positioning groove 315 is also provided with a chamfer, so as to facilitate the push rod 341 to slide from one guide groove to another guide groove through the movement of the push rod 31.

[0077] like Figure 3 As shown, the exhaust structure 3 further includes a first end cover 35 and a second end cover 36, which are respectively detachably connected to the housing 1 and are located at both ends of the mounting hole 14, and both ends of the push rod 31 respectively pass through and are slidably arranged on the first end cover 35 and the second end cover 36. By providing the first end cover 35 and the second end cover 36, the push rod 31 slides in the holes on the first end cover 35 and the second end cover 36, and the holes on the first end cover 35 and the second end cover 36 form a guide rail, which is convenient for guiding and fixing the push rod 31. The first end cover 35 and the second end cover 36 are detachably connected to the housing 1, which is convenient for disassembly and maintenance of the push rod 31.

[0078] like Figure 3 and Figure 4 As shown, a through groove 314 is provided on the outer circumference of the push rod 31. When the push rod 31 slides to the second position, the through groove 314 is in the flow channel 13 for connecting the flow channels 13 on both sides of the push rod 31. The through groove 314 is provided on the outer circumference of the push rod 31 to reduce the space occupied by the push rod 31 on the flow channel 13, increase the aperture of the flow channel 13 when passing through the push rod 31, and reduce the influence of the push rod 31 on the fluid.

[0079] like Figure 3As shown, the check assembly includes a valve core 21 and an elastic component 22, and the inner wall of the valve body is provided with a third valve seat 17. The 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 valve core 21 and makes the valve core 21 abut against the third valve seat 17 in the direction of the fluid. The valve core 21 abuts against the third valve seat 17 in the direction of the fluid by the elastic force of the elastic component 22, so that the flow channel 13 is closed. When the fluid flows in from the inlet 11, when the force of the fluid acting on the valve core 21 is greater than the elastic force of the elastic component 22, the valve core 21 moves away from the third valve seat 17, the flow channel 13 is opened, and the flow channel 13 is conducted from the inlet 11 to the outlet 12. When the force of the fluid acting on the valve core 21 is less than the elastic force of the elastic component 22 or the fluid flows from the outlet 12 to the inlet 11, the valve core 21 abuts against the third valve seat 17, and the flow channel 13 is closed, so that the flow channel 13 is cut off.

[0080] 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 water purifier. 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 structure 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.

[0081] 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.

[0082] 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 structure, wherein the housing has an inlet, an outlet and a flow channel connecting the inlet and the outlet, characterized in that: The check valve further includes an exhaust structure, a mounting hole is provided on the wall surface of the shell, the mounting hole is located upstream of the check structure, the mounting hole penetrates the shell along the radial direction of the shell, the exhaust structure is installed in the mounting hole, the exhaust structure includes a push rod, the push rod is penetrated in the mounting hole and slidably arranged in the mounting hole along the radial direction, and at least one end of the push rod is exposed from the outer wall surface of the shell; When the push rod slides to the first position, the mounting hole is opened, and the flow channel is connected to the outside through the mounting hole; When the push rod slides to the second position, the mounting hole is closed.

2. The check valve according to claim 1, characterized in that: The inner wall of the shell is provided with a first valve seat and a second valve seat, the push rod is provided with a first abutting portion and a second abutting portion, the first abutting portion is provided corresponding to the first valve seat, and the second abutting portion is provided corresponding to the second valve seat. When the push rod slides to the first position, the first abutting portion is misaligned with the first valve seat, and the second abutting portion is misaligned with the second valve seat; When the push rod slides to the second position, the first abutting portion abuts against the first valve seat, and the second abutting portion abuts against the second valve seat.

3. The check valve according to claim 2, characterized in that: The push rod is provided with a ventilation groove, and the ventilation groove is extended along the axial direction of the push rod. When the push rod slides to the first position, the flow channel is communicated with the outside through the vent groove.

4. The check valve according to claim 2, characterized in that: The exhaust structure further includes a first sealing ring and a second sealing ring. The first sealing ring is installed between the first abutting portion of the push rod and the first valve seat, and the second sealing ring is installed between the second abutting portion of the push rod and the second valve seat.

5. The check valve according to claim 4, characterized in that: A first mounting groove is arranged on the outer circumferential surface of the first abutting portion, and the first sealing ring is embedded in the first mounting groove. A second mounting groove is arranged on the outer circumferential surface of the second abutting portion, and the second sealing ring is embedded in the second mounting groove.

6. The check valve according to claim 1, characterized in that: The exhaust structure further includes a locking mechanism, which is disposed between the housing and the push rod, and the locking mechanism can fix the push rod in the first position or the second position.

7. The check valve according to claim 6, characterized in that: The locking mechanism includes a push rod and an elastic element. The push rod is slidably arranged on the outer shell along the radial direction of the push rod. The two ends of the elastic element are respectively connected to the push rod and the outer shell. Two positioning grooves are arranged on the push rod, one positioning groove corresponds to the first position, and the other positioning groove corresponds to the second position. The elastic element exerts a force so that one end of the push rod is embedded in the positioning groove.

8. The check valve according to claim 1, characterized in that: The exhaust structure also includes a first end cover and a second end cover, wherein the first end cover and the second end cover are respectively detachably connected to the shell and are located at two ends of the mounting hole, and two ends of the push rod respectively pass through and are slidably disposed on the first end cover and the second end cover.

9. The check valve according to claim 1, characterized in that: A through groove is arranged on the outer circumferential surface of the push rod. When the push rod slides to the second position, the through groove is located in the flow channel for connecting the flow channels on both sides of the push rod.

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 water purifier.

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