Check valve and water purifier

Abstract

The utility model discloses a check valve and a water purifier, and the check valve comprises a valve body which is provided with an inlet, an outlet and a flow channel for communicating the inlet with the outlet; the non-return assembly is installed on the flow channel and used for conducting the non-return valve in the direction from the inlet to the outlet in a one-way mode; a vent hole for communicating the flow channel with the outside is formed in the peripheral surface of the valve body, the vent hole is located at the upstream of the non-return assembly, and the opening and closing unit is installed on the vent hole and used for opening or closing the vent hole. According to the check valve, the opening and closing unit is arranged on the upstream portion of the check assembly, gas on the upstream portion of the check valve is exhausted by opening the opening and closing unit, remaining liquid pulled by the check structure is exhausted, then the centrifugal pump installed on the upstream portion of the check valve is exhausted, 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 it is easy 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] A check valve, comprising:

[0006] A valve body having an inlet and an outlet and a flow channel connecting the inlet and the outlet;

[0007] A check assembly, installed in the flow channel, used for the check valve to conduct one-way from the inlet to the outlet;

[0008] An opening and closing unit, wherein 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, and the opening and closing unit is installed on the vent hole for opening or closing the vent hole.

[0009] In this solution, if a check valve is used after the centrifugal pump, air will enter the centrifugal pump after the centrifugal pump evacuates the water from the water tank, and the check valve will cause air entrapment because there is still residual liquid upstream of the check structure of the check valve, and the gravity of the retained liquid pulls the check structure. 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 opening and closing unit upstream of the check assembly. By opening the opening and closing unit, the gas upstream of the check valve is discharged, so that the retained liquid pulled by the check structure is discharged, and then the centrifugal pump installed upstream of the check valve is exhausted, thereby improving the efficiency of the centrifugal pump.

[0010] Preferably, the inner wall of the valve body is provided with a first valve seat, the opening and closing unit includes a first valve core, an elastic element and an end cover, the end cover is connected to the valve body and covers the outer side of the air vent, the first valve core passes through the end cover and is slidably arranged on the air vent, the limiting portion of the first valve core abuts against the inner side of the end cover, the two ends of the elastic element are respectively connected to the first valve core and the valve body, and the elastic element applies a force so that the abutting portion of the first valve core abuts against the first valve seat.

[0011] In this solution, the elastic element applies a force to the first valve core, causing the first valve core to slide outward, and the limiting portion of the first valve core abuts against the inner side of the end cover, limiting the outward movement of the first valve core. When the first valve core is pressed, the elastic force of the elastic element is overcome, causing the first valve core to slide inward, and the abutting portion of the first valve core is misaligned with the first valve seat, and the vent is opened. When the first valve core is released, the first valve core slides outward under the elastic force of the elastic element, causing the abutting portion to abut against the first valve seat, and the vent is closed. By pressing the first valve core, the vent can be opened or closed, which is convenient for exhaust and easy to operate.

[0012] Preferably, the first valve core has a changing outer diameter along the length direction, for example, the outer diameter of the abutment portion is larger than the outer diameter of the valve stem of the first valve core, so that the vent hole is opened when the abutment portion is misaligned with the first valve seat.

[0013] Preferably, the diameters of the first valve core are the same, and a ventilation groove is provided on the first valve core, one end of the ventilation groove extends to the outside along the axial direction of the first valve core, and the other end of the ventilation groove extends to a position close to the abutment portion. No ventilation groove is provided on the abutment portion. When the abutment portion is misaligned with the first valve seat, the ventilation groove connects the outside with the ventilation hole.

[0014] Preferably, the end of the first valve core abutting against the first valve seat is provided with a chamfer;

[0015] And / or, the inner wall of the first valve seat is provided with a chamfer.

[0016] In this solution, chamfers are provided at the end of the first valve core and the inner wall of the first valve seat respectively, so that the first valve core can slide smoothly in the first valve seat and prevent sticking.

[0017] Preferably, the end cover is detachably connected to the valve body.

[0018] In this solution, the above-mentioned structural arrangement is adopted to facilitate the installation and maintenance of the first valve core.

[0019] Preferably, the opening and closing unit further includes a first sealing ring, and the first sealing ring is arranged between the first valve core and the first valve seat.

[0020] In this solution, the first sealing ring is used to seal the gap between the first valve core and the first valve seat to prevent the opening and closing unit from leaking liquid or air when it is closed.

[0021] Preferably, the first sealing ring is embedded in the abutting portion of the first valve core, and the first sealing ring moves with the first valve core, or the first sealing ring is embedded in the inner wall of the first valve seat, and neither the first sealing ring nor the first valve seat moves.

[0022] Preferably, the opening and closing unit further includes a second sealing ring, and the second sealing ring is arranged between the first valve core and the end cover.

[0023] In this solution, when the opening and closing unit is closed, the first sealing ring is used to seal the gap between the first valve core and the end cover to prevent liquid or gas leakage and improve the air tightness of the check valve.

[0024] Preferably, the valve body comprises a main body and a sheath, the sheath is embedded in the vent hole, and the first valve seat is arranged on an inner wall of the sheath.

[0025] In this solution, since the first valve seat is arranged on the inner wall of the sleeve, the first valve core slides in the sleeve, and the sliding is smoother. In addition, the first valve core does not directly slide and rub against the body, thereby protecting the structure of the body and extending the service life.

[0026] Preferably, a third sealing ring is provided between the sheath and the body.

[0027] In this solution, the third sealing ring is used to seal the gap between the sheath and the body to improve air tightness. Preferably, a groove is provided on the outer peripheral surface of the sheath, and the third sealing ring is embedded in the groove to facilitate assembly of the sheath.

[0028] Preferably, 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 movably arranged in the flow channel 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 toward which the fluid comes.

[0029] In this solution, 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, the flow channel is closed, and the flow channel is cut off.

[0030] A water purifier comprises the check valve as described above.

[0031] 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.

[0032] 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.

[0033] The positive and progressive effect of the utility model is that if a check valve is used after a centrifugal pump, air will enter the centrifugal pump after the centrifugal pump evacuates the water from the water tank, and the check valve will cause air entrapment because there is still residual liquid upstream of the check structure of the check valve, and the gravity of the retained liquid pulls the check structure. 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 opening and closing unit upstream of the check assembly, and the opening and closing unit is opened to discharge the gas upstream of the check valve, so that the retained liquid pulled by the check structure is discharged, and then the centrifugal pump installed upstream of the check valve is exhausted, thereby improving the efficiency of the centrifugal pump. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The structure of the check valve of the first embodiment of the utility model is shown in FIG. Figure 1 .

[0035] Figure 2 The structure of the check valve of the first embodiment of the utility model is shown in FIG. Figure 2 .

[0036] Figure 3 for Figure 2 Sectional view along line AA.

[0037] Figure 4 This is a schematic structural diagram of the first valve core of Example 1 of the utility model.

[0038] Figure 5 This is a schematic structural diagram of the check valve of Example 2 of the utility model.

[0039] Figure 6 for Figure 5 Sectional view along line BB.

[0040] Description of reference numerals:

[0041] Valve body 1

[0042] Ontology 101

[0043] Sheath 102

[0044] Import 11

[0045] Exit 12

[0046] Runner 13

[0047] Ventilation holes 14

[0048] First valve seat 15

[0049] Second valve seat 16

[0050] Check component 2

[0051] Second valve core 21

[0052] Elastic member 22

[0053] Opening and closing unit 3

[0054] The first valve core 31

[0055] Limiting part 311

[0056] Contact portion 312

[0057] Ventilation slot 313

[0058] Elastic element 32

[0059] End cap 33

[0060] First sealing ring 34

[0061] Second sealing ring 35

[0062] The third sealing ring 4

[0063] Liquid flow direction 100 DETAILED DESCRIPTION

[0064] 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.

[0065] Example 1

[0066] like Figure 1-Figure 4 As shown, the present embodiment discloses a check valve, which includes a valve body 1, a check assembly 2 and an opening and closing unit 3. 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 on the flow channel 13, and is used for the check valve to unidirectionally conduct from the inlet 11 toward the outlet 12. A vent hole 14 connecting the flow channel 13 with the outside is provided on the outer peripheral surface of the valve body 1, and the vent hole 14 is located upstream of the check assembly 2. The opening and closing unit 3 is installed on the vent hole 14, and is used to open or close the vent hole 14.

[0067] In this embodiment, if a check valve is used 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 retained liquid upstream of the check structure of the check valve, and the gravity of the retained liquid pulls the check structure. 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 opening and closing unit 3 upstream of the check assembly 2. The opening and closing unit 3 is opened to discharge the gas upstream of the check valve, so that the retained liquid pulled by the check structure is discharged, and then the centrifugal pump installed upstream of the check valve is exhausted, thereby improving the efficiency of the centrifugal pump. The liquid in the check valve flows in the direction 100 as shown in FIG. Figure 1 and Figure 2 As shown by the arrow on the outer surface of the middle valve body.

[0068] like Figure 3 As shown, the inner wall of the valve body 1 is provided with a first valve seat 15, the opening and closing unit 3 includes a first valve core 31, an elastic element 32 and an end cover 33, the end cover 33 is connected to the valve body 1 and is covered on the outside of the vent hole 14, the first valve core 31 passes through the end cover 33 and is slidably arranged on the vent hole 14, the limiting portion 311 of the first valve core 31 abuts against the inner side of the end cover 33, the two ends of the elastic element 32 are respectively connected to the first valve core 31 and the valve body 1, and the elastic element 32 applies a force to make the abutting portion 312 of the first valve core 31 abut against the first valve seat 15. The elastic element 32 applies a force to the first valve core 31, so that the first valve core 31 slides outward, and the limiting portion 311 of the first valve core 31 abuts against the inner side of the end cover 33, limiting the first valve core 31 from moving outward. When the first valve core 31 is pressed, the elastic force of the elastic element 32 is overcome, and the first valve core 31 slides inward, so that the abutting portion 312 of the first valve core 31 is misaligned with the first valve seat 15, and the vent 14 is opened. When the first valve core 31 is released, the first valve core 31 slides outward under the elastic force of the elastic element 32, so that the abutting portion 312 abuts against the first valve seat 15, and the vent 14 is closed. By pressing the first valve core 31, the vent 14 is opened or closed, which is convenient for exhaust and easy to operate.

[0069] like Figure 4As shown, in the present embodiment, a ventilation groove 313 is provided on the first valve core 31, one end of the ventilation groove 313 extends to the outside along the axial direction of the first valve core 31, and the other end of the ventilation groove 313 extends to a position close to the abutment portion 312. The ventilation groove 313 is not provided on the abutment portion 312. When the abutment portion 312 is misaligned with the first valve seat 15, the ventilation groove 313 connects the outside with the ventilation hole 14.

[0070] In another embodiment, the first valve core 31 has a variable outer diameter along the length direction, for example, the outer diameter of the abutment portion 312 is larger than the outer diameter of the valve stem of the first valve core 31, so that the vent hole 14 is opened when the abutment portion 312 is misaligned with the first valve seat 15.

[0071] Preferably, the end of the first valve core 31 abutting against one end of the first valve seat 15 is provided with a chamfer, and the inner wall of the first valve seat 15 is provided with a chamfer. By providing chamfers at the end of the first valve core 31 and the inner wall of the first valve seat 15, respectively, the first valve core 31 can slide smoothly in the first valve seat 15 to prevent sticking.

[0072] The end cover 33 is detachably connected to the valve body 1, which is convenient for installing and maintaining the first valve core 31. Specifically, the end cover 33 is threadedly connected to the valve body 1.

[0073] like Figure 3 As shown, the opening and closing unit 3 further includes a first sealing ring 34, which is disposed between the first valve core 31 and the first valve seat 15. The first sealing ring 34 is used to seal the gap between the first valve core 31 and the first valve seat 15 to prevent the opening and closing unit 3 from leaking liquid or air when closed.

[0074] Preferably, the first sealing ring 34 is embedded in the abutting portion 312 of the first valve core 31 and moves with the first valve core 31 , or the first sealing ring 34 is embedded in the inner wall of the first valve seat 15 and neither the first sealing ring 34 nor the first valve seat 15 moves.

[0075] like Figure 3 As shown, the opening and closing unit 3 also includes a second sealing ring 35, which is arranged between the first valve core 31 and the end cover 33. When the opening and closing unit 3 is closed, the first sealing ring 34 is used to seal the gap between the first valve core 31 and the end cover 33 to prevent liquid leakage or gas leakage and improve the air tightness of the check valve.

[0076] like Figure 3As 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 .

[0077] This embodiment also discloses a water purifier, which includes the check valve as described above. 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 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.

[0078] Example 2

[0079] like Figure 5 and Figure 6 As shown, this embodiment is basically the same as the embodiment 1, and the difference is that the valve body 1 includes a main body 101 and a sheath 102, the sheath 102 is embedded in the vent hole 14, and the first valve seat 15 is arranged on the inner wall of the sheath 102. Since the first valve seat 15 is arranged on the inner wall of the sheath 102, the first valve core 31 slides in the sheath 102, and the sliding is smoother, and the first valve core 31 does not directly rub and slide with the main body 101, thereby protecting the structure of the main body 101 and extending the service life.

[0080] A third sealing ring 4 is provided between the sheath 102 and the body 101. The third sealing ring 4 is used to seal the gap between the sheath 102 and the body 101 to improve air tightness.

[0081] Preferably, a groove is provided on the outer circumferential surface of the sheath 102 , and the third sealing ring 4 is embedded in the groove to facilitate assembly of the sheath 102 .

[0082] 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.

[0083] 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, characterized in that: The check valve comprises: A valve body having an inlet and an outlet and a flow channel connecting the inlet and the outlet; A check assembly, installed in the flow channel, used for the check valve to conduct one-way from the inlet to the outlet; An opening and closing unit, wherein 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, and the opening and closing unit is installed on the vent hole for opening or closing the vent hole.

2. The check valve according to claim 1, characterized in that: The inner wall of the valve body is provided with a first valve seat, the opening and closing unit includes a first valve core, an elastic element and an end cover, the end cover is connected to the valve body and covers the outer side of the air vent, the first valve core passes through the end cover and is slidably arranged on the air vent, the limiting portion of the first valve core abuts against the inner side of the end cover, the two ends of the elastic element are respectively connected to the first valve core and the valve body, and the elastic element exerts a force so that the abutting portion of the first valve core abuts against the first valve seat.

3. The check valve according to claim 2, characterized in that: An end portion of the first valve core abutting against the first valve seat is provided with a chamfer; And / or, the inner wall of the first valve seat is provided with a chamfer.

4. The check valve according to claim 2, characterized in that: The end cover is detachably connected to the valve body.

5. The check valve according to claim 2, characterized in that: The opening and closing unit further includes a first sealing ring, which is disposed between the first valve core and the first valve seat.

6. The check valve according to claim 2, characterized in that: The opening and closing unit further includes a second sealing ring, which is arranged between the first valve core and the end cover.

7. The check valve according to claim 2, characterized in that: The valve body comprises a main body and a sheath, the sheath is embedded in the vent hole, and the first valve seat is arranged on the inner wall of the sheath.

8. The check valve according to claim 7, characterized in that: A third sealing ring is arranged between the sheath and the body.

9. The check valve according to any one of claims 1 to 8, characterized in that: 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 movably arranged in the flow channel 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 toward which the fluid comes.

10. A water purifier, characterized in that: The water purifier comprises a non-return valve as claimed in any one of claims 1 to 9.

Images