A check valve for a water pump

Abstract

The present invention discloses a check valve for a water pump, which includes a flange shell, a rotating shaft and a check structure. The flange shell is provided with a water inlet end and a water outlet end, and the water inlet end and the water outlet end are in through connection. The check structure is hinged to the water outlet end of the flange shell through the rotating shaft, so that the check structure seals or opens the water outlet end. The check structure includes a rotating plate, a sealing gasket and a counterweight plate. The sealing gasket is in sealed butt joint with the water outlet end. The counterweight plate abuts against the sealing gasket and is fixedly connected to the rotating plate by screws, so that the sealing gasket is firmly held between the rotating plate and the counterweight plate. The end face of the water outlet end starts from the upper edge and ends at the lower edge, and is designed to be inclined downward and outward along the direction from the water inlet end to the water outlet end. The check valve for the water pump of the present invention has a more obvious overall check function, good check effect and long service life.

Description

Technical Field

[0001] The present invention belongs to the technical field of accessories for water pumps, and particularly relates to a check valve for a water pump. Background Art

[0002] A water pump includes a pump body, and an inlet and an outlet are provided on the pump body. A check valve is usually installed at the inlet. The existing check valve is integrally formed of a silicone or rubber material as a whole, and includes a housing and a check plate. The check plate and the housing are only connected by an integrally formed hinge strip. Through the flexibility and deformability of the silicone or rubber material, the check plate can be flipped relative to the housing. For the above-mentioned check valve, during long-term use, the hinge position is prone to breakage, and rubber and silicone are prone to aging, resulting in a short service life. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to provide a check valve for a water pump, which has a more obvious overall check function, good check effect, and long service life.

[0004] To solve the above technical problem, a technical solution for a check valve for a water pump of the present invention is as follows:

[0005] The present invention discloses a check valve for a water pump, which includes a flange housing, a rotating shaft and a check structure. An inlet end and an outlet end are provided on the flange housing, and the inlet end and the outlet end are in through communication. The check structure is hinged to the outlet end position of the flange housing through the rotating shaft, so that the check structure seals or opens the outlet end; the check structure includes a rotating plate, a sealing gasket and a counterweight plate. The sealing gasket is in sealed butt joint with the outlet end, the counterweight plate abuts against the sealing gasket, and is connected and fixed to the rotating plate by screws, so that the sealing gasket is fastened between the rotating plate and the counterweight plate; starting from the upper edge of the end face of the outlet end and ending at the lower edge, and at the same time, it is designed to be inclined downward and outward along the direction from the inlet end to the outlet end.

[0006] A torsion spring is sleeved on the rotating shaft, one torsion arm of the torsion spring abuts against the flange housing, and the other torsion arm abuts against the rotating plate.

[0007] A filter screen is provided at the inlet end.

[0008] A rubber sleeve is sleeved on the flange housing. A plurality of positioning teeth are provided on the inner peripheral wall of the rubber sleeve, and the plurality of positioning teeth correspond to the positioning grooves on the flange housing. A positioning protrusion is provided on the outer peripheral wall of the rubber sleeve.

[0009] One end of the rotating shaft has knurled teeth, and the knurled teeth are in interference fit with the shaft hole on the flange housing; the other end of the rotating shaft is also in interference fit with the shaft hole on the flange housing.

[0010] The rotating plate is provided with lugs, and a long oval hole is provided at the center of the lug. The rotating shaft passes through the long oval hole, and the aperture of the long oval hole is larger than the outer diameter of the rotating shaft.

[0011] The rotating plate is provided with at least one screw connection post. The sealing gasket and the counterweight plate are both provided with jacks corresponding to and matching the screw connection posts. A groove is provided on the sealing gasket, and the counterweight plate is fitted into the groove. A screw hole is provided at the center of the screw connection post, and a screw is screwed into the screw hole.

[0012] The water outlet end is provided with an annular rib.

[0013] The beneficial effects of the present invention are as follows:

[0014] Compared with the prior art, for the check valve for a water pump of the present invention, a filter screen is provided at the water inlet end, which can filter larger particle impurities in the water, avoiding the accumulation and blockage of the large particle impurities on the pump body and internal parts. The smaller particles passing through the filter screen can smoothly enter and leave the pump body, and there is no accumulation problem in the pump body.

[0015] Compared with the prior art, for the check valve for a water pump of the present invention, a counterweight plate is added, so that the sealing gasket on the rotating plate can better seal with the water outlet end, and the sealing effect is better.

[0016] Compared with the prior art, for the check valve for a water pump of the present invention, one end of the rotating shaft has knurled teeth, making the assembly of the rotating shaft more firm and more stable during operation.

[0017] Compared with the prior art, for the check valve for a water pump of the present invention, the rubber sleeve on the flange shell plays a sealing role and also a positioning role. First, there are positioning teeth between the rubber sleeve and the flange shell, so that the position of the positioning protrusion on the rubber sleeve is fixed relative to the flange shell. When the entire check valve is installed at the water inlet of the water pump, the check valve structure can always maintain an accurate hanging position with the positioning protrusion as a reference point, with high assembly accuracy and high assembly efficiency.

[0018] Compared with the prior art, for the check valve for a water pump of the present invention, the water outlet end has an annular rib, and when the sealing gasket matches it, the sealing effect is better. Description of the Drawings

[0019] Figure 1 is the three-dimensional exploded view of the check valve for a water pump of the present invention installed on the water pump;

[0020] Figure 2 is the three-dimensional view of the check valve for a water pump of the present invention at one angle;

[0021] Figure 3 is the three-dimensional view of the check valve for a water pump of the present invention at another angle;

[0022] Figure 4 This is an exploded perspective view of the check valve for a water pump according to the present invention;

[0023] Figure 5 This is an exploded perspective view of the check structure of the check valve for a water pump according to the present invention;

[0024] Figure 6 This is a structural cross-sectional view of the check valve for a water pump according to the present invention. Detailed Embodiment

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments:

[0026] Please refer to Figures 1 to 6 , the present invention provides a check valve for a water pump, including a flange housing 1, a rotating shaft 2 and a check structure 3. An inlet end 4 and an outlet end 5 are provided on the flange housing 1. The inlet end 4 and the outlet end 5 are in through communication. The check structure 3 is hinged to the outlet end 5 of the flange housing 1 through the rotating shaft 2, so that the check structure 3 seals or opens the outlet end 5; the check structure 3 includes a rotating plate 6, a sealing gasket 7 and a counterweight plate 8. The sealing gasket 7 is in sealing butt joint with the outlet end 5. The counterweight plate 8 is made of stainless steel, abuts against the sealing gasket 7, and is connected and fixed to the rotating plate 6 by screws, so that the sealing gasket 7 is fastened between the rotating plate 6 and the counterweight plate 8; starting from the upper edge along the end face of the outlet end 5 and ending at the lower edge, and simultaneously inclining downward and outward along the direction from the inlet end 4 to the outlet end 5. With this inclined design, under normal conditions, the component of the gravity of the check structure 3 always acts on the inlet end 4, so that the sealing gasket 7 always tightly seals and fits against the outlet end 5, playing a sealing role with good sealing performance.

[0027] A torsion spring 9 is sleeved on the rotating shaft 2. One torsion arm 10 of the torsion spring 9 abuts against the flange housing 1, and the other torsion arm 11 abuts against the rotating plate 6. The torsion spring 9 is made of stainless steel and can play a role in accelerating the reset and sealing of the check structure 3, thereby improving the check function.

[0028] A filter screen 12 is provided at the inlet end 4. The mesh size of the filter screen 12 is relatively large, mainly filtering larger particles of impurities. Because smaller particles are directly discharged from the outlet of the pump body after entering the pump body, while if larger particles enter the pump body, it may cause blockage of the pump body.

[0029] A rubber sleeve 13 is sleeved on the flange housing 1. A plurality of positioning teeth 14 are provided on the inner peripheral wall of the rubber sleeve 13. The plurality of positioning teeth 14 correspond to the positioning grooves 15 on the flange housing 1. A positioning protrusion 16 is provided on the outer peripheral wall of the rubber sleeve 13.

[0030] One end of the rotating shaft 2 has knurled teeth 17, and the knurled teeth 17 are in interference fit with the shaft hole 18 on the flange housing 1. The other end of the rotating shaft 2 is also in interference fit with the shaft hole 18 on the flange housing 1.

[0031] The rotating plate 6 is provided with a lug 19, and a long oval hole 20 is provided at the center of the lug 19. The rotating shaft 2 passes through the long oval hole 20, and the aperture of the long oval hole 20 is larger than the outer diameter of the rotating shaft 2. The design of the long oval hole 20 makes the check structure 3 more smooth and not jammed when flipping, ensuring the smooth sealing or opening of the check structure 3.

[0032] The rotating plate 6 is provided with at least one screw connection post 21. The sealing gasket 7 and the counterweight plate 8 are both provided with jacks 22 corresponding to and matching the screw connection posts 21, and a groove 23 is provided on the sealing gasket 7. The counterweight plate 8 is fitted into the groove 23. A screw hole 24 is provided at the center of the screw connection post 21, and a screw is screwed into the screw hole 24. The screw connection posts 21 play a role in assembling and positioning the sealing gasket 7 and the counterweight plate 8, ensuring the quick assembly and assembly accuracy of the sealing gasket 7 and the counterweight plate 8. At the same time, the screw connection posts 21 can ensure that the sealing gasket 7 is not easily deformed and play a supporting role for the sealing gasket 7.

[0033] The water outlet end 5 is provided with an annular rib 30. When the sealing gasket 7 is in cooperation with it, the sealing gasket 7 is subjected to the component force of the gravity of the check structure 3 and the pressure of the water pressure on the check structure 3, so that the sealing gasket 7 is only in close contact with the water outlet end 5. The annular rib 30 on the water outlet end 5 has a reaction force on the sealing gasket 7, so that the annular rib 30 squeezes the inner surface of the sealing gasket 7, causing the position where the annular rib 30 contacts the inner surface of the sealing gasket 7 to deform, making the cooperation between the annular rib 30 and the sealing gasket 7 closer and the sealing performance better.

[0034] The working principle of the check valve for a water pump of the present invention is described as follows:

[0035] The check valve for a water pump of the present invention can be used for any water pump on the market. An inlet flange 26 is usually installed at the water inlet of the pump housing 25. There is a concave cavity 27 on the inner end face of the inlet flange 26. The concave cavity 27 is used to install the check valve 28, so that the check valve 28 is located between the inlet flange 26 and the water inlet of the pump body. A positioning card slot 29 matching the positioning protrusion 16 of the rubber sleeve 13 is provided in the concave cavity 27. At the same time, the relative position of the rubber sleeve 13 and the flange housing 1 is fixed and assembled through the positioning teeth 14 and the positioning groove 15. Therefore, during assembly, after the positioning protrusion 16 is inserted into the positioning card slot 29, the check structure 3 of the check valve 28 is in a natural hanging state and the check structure 3 is not inclined, so as to obtain the best pendulum effect and good check effect.

[0036] When the water pump starts to work, water enters from the filter screen 12 at the water inlet end 4 and is discharged from the water outlet end 5. During this process, the negative pressure of the water is greater than the component force of the gravity of the check structure 3, so that the check structure 3 rotates upward around the rotating shaft 2, and the water smoothly enters the pump body. When the water pump stops, the instantaneous negative pressure reversely pushes the check structure 3 to rotate towards the water outlet end 5. At the same time, with the action of the counterweight plate 8, the falling and rotating of the check structure 3 are accelerated, and the capacity of the reverse water loss in the pump body is reduced.

[0037] The check valve for a water pump provided by the embodiments of the present invention has been introduced in detail above. Specific examples are used in this article to elaborate on the principle and implementation manner of the present invention. The description of the above embodiments is only used to help understand the technical solution disclosed by the present invention; at the same time, for those of ordinary skill in the art, according to the idea of the present invention, there will be changes in the specific implementation manner and application scope. In summary, the content of this specification should not be construed as a limitation of the present invention.

Claims

1. A check valve for a water pump, characterized in that: It includes a flange housing, a rotating shaft and a check structure. The flange housing is provided with a water inlet end and a water outlet end, and the water inlet end and the water outlet end are in through connection. The check structure is hinged to the water outlet end of the flange housing through the rotating shaft, so that the check structure seals or opens the water outlet end; the check structure includes a rotating plate, a sealing gasket and a counterweight plate. The sealing gasket is in sealed butt joint with the water outlet end. The counterweight plate abuts against the sealing gasket and is fixedly connected to the rotating plate by screws, so that the sealing gasket is fastened between the rotating plate and the counterweight plate; starting from the upper edge of the end face of the water outlet end and ending at the lower edge, and simultaneously inclining downward and outward along the direction from the water inlet end to the water outlet end; a rubber sleeve is sleeved on the flange housing. A plurality of positioning teeth are provided on the inner peripheral wall of the rubber sleeve. The plurality of positioning teeth correspond to the positioning grooves on the flange housing. A positioning protrusion is provided on the outer peripheral wall of the rubber sleeve; an annular rib is provided at the water outlet end.

2. The check valve for a water pump according to claim 1, wherein: A torsion spring is sleeved on the rotating shaft. One torsion arm of the torsion spring abuts against the flange housing, and the other torsion arm abuts against the rotating plate.

3. The check valve for a water pump according to claim 1, characterized in that: A filter screen is provided at the water inlet end.

4. A check valve for a water pump according to claim 1, characterized in that: One end of the rotating shaft has knurled teeth, and the knurled teeth are in interference fit with the shaft hole on the flange housing; the other end of the rotating shaft is in interference fit with the shaft hole on the flange housing.

5. The check valve for a water pump according to claim 1, wherein: Ears are provided on the rotating plate, and a long oval hole is provided at the center of the ears. The rotating shaft passes through the long oval hole, and the aperture of the long oval hole is larger than the outer diameter of the rotating shaft.

6. The check valve for a water pump according to claim 1 or 5, characterized in that: At least one screw connection post is provided on the rotating plate. Jacks corresponding to the screw connection posts are provided on both the sealing gasket and the counterweight plate. A groove is provided on the sealing gasket, and the counterweight plate is fitted and embedded in the groove. A screw hole is provided at the center of the screw connection post, and a screw is screwed in the screw hole.

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