Check valve

Abstract

The utility model belongs to the technical field of water pumps, in particular to a check valve, which comprises a valve seat, a screw rod, a piston plate and a flat gasket, the screw rod comprises a head part and a rod part, the piston plate is formed on the screw rod through injection molding and wraps the head part, and the flat gasket is made of rubber and is formed on the piston plate through vulcanization. According to the check valve, leakage can be effectively prevented, the flat gasket can be effectively prevented from displacing and rolling over, and the check valve is good in reliability.

Description

Technical field:

[0001] The utility model belongs to the technical field of water pumps, in particular to a check valve. Background technology:

[0002] The Chinese utility model patent (Announcement No. CN217233811U, application date 2022.02.26, announcement date 2022.08.19) discloses a check valve for a self-priming pump, the check valve comprises a valve cover (i.e., a piston plate) and a valve seat which are sealed and connected, a valve stem seat is arranged at the axis of the valve seat, the valve stem seat is connected to the inner wall of the valve seat by a plurality of spaced connecting plates, the gap between adjacent connecting plates forms the water inlet of the check valve, the gap between the valve cover and the valve seat after the valve cover moves upward forms the water outlet of the check valve, a filter screen is arranged below the valve seat, the filter screen wraps the water inlet and isolates the water inlet from the external water body, and a filter cavity is formed between the filter screen and the water inlet. A coaxial valve stem (i.e., a screw) is fixed at the axis of the valve cover, the valve stem is inserted into the valve stem seat, a spring is arranged between the valve stem cap at the bottom of the valve stem and the valve stem seat, and the valve stem and the spring below the valve stem seat are both located in the filter cavity. A flat gasket is arranged at the bottom of the valve cover, the flat gasket is sealingly connected to the upper end surface of the valve seat, and a nut for fixing the flat gasket is threaded on the valve stem.

[0003] The disadvantages of the above-mentioned check valve are that the screw, nut and piston plate are connected by threads, there is a gap at the connection, which will cause leakage problems, and the flat gasket will produce displacement, rolling and other problems during operation, which will lead to failure of the check valve. Summary of the invention:

[0004] The utility model aims to provide a check valve, which can effectively prevent leakage and displacement and rolling of a flat gasket, and has good reliability.

[0005] The utility model is achieved in this way:

[0006] A check valve comprises a valve seat, a screw, a piston plate and a flat gasket. The screw comprises a head and a rod. The piston plate is injection molded on the screw and wraps the head. The flat gasket is made of rubber and is molded on the piston plate by vulcanization.

[0007] In the above-mentioned check valve, a mounting block is formed on the upper surface of the piston plate, and the head is arranged in the mounting block.

[0008] In the above-mentioned check valve, the mounting block is in the shape of a regular prism.

[0009] In the above-mentioned check valve, the lower surface of the piston plate is concave to form a mounting groove, and the flat gasket forms a convex block at the mounting groove.

[0010] In the above-mentioned check valve, the installation groove and the protrusion are both annular structures.

[0011] In the above-mentioned check valve, a screw seat is provided in the valve seat, the rod of the screw is slidably arranged in the screw seat, a nut is threadedly connected to the lower end of the rod, a spring is sleeved on the outside of the rod, the upper end of the spring abuts against the screw seat, and the lower end abuts against the nut.

[0012] In the above-mentioned check valve, the screw seat includes a mounting seat and a connecting rod. There are multiple connecting rods distributed around the mounting seat. One end of the connecting rod is connected to the valve seat and the other end is connected to the mounting seat. The rod portion of the screw is slidably disposed in the mounting seat.

[0013] In the above-mentioned check valve, the screw seat and the valve seat are an integrated structure.

[0014] In the above-mentioned check valve, the middle part of the mounting seat is a cylinder, and the lower end is a truncated cone with a larger diameter at the top and smaller diameter at the bottom. The upper end of the spring is sleeved outside the truncated cone, and the connecting rod is connected to the cylinder.

[0015] In the above-mentioned check valve, the diameter of the cylinder is larger than the maximum diameter of the frustum.

[0016] The outstanding advantages of the utility model compared with the prior art are:

[0017] 1. The piston plate of the utility model is injection molded on the screw and wraps the head inside. The flat gasket is vulcanized on the piston plate. There is no gap between the screw and the piston plate, between the screw and the flat gasket, and between the flat gasket and the piston plate, which effectively prevents leakage. The flat gasket is fixed on the piston plate by vulcanization, which effectively prevents the flat gasket from displacement and rolling during operation, and the check valve has good reliability.

[0018] 2. The upper surface of the piston plate of the utility model is convex to form a mounting block, and the head is arranged in the mounting block, which effectively ensures the mounting strength of the screw while minimizing the volume of the piston plate;

[0019] 3. The lower surface of the piston plate of the utility model is concave to form a mounting groove, and the flat gasket forms a convex block at the mounting groove, which effectively strengthens the connection strength between the piston plate and the flat gasket. Description of the drawings:

[0020] Figure 1 It is a cross-sectional view of the utility model.

[0021] Figure numerals: 1, valve seat; 2, screw; 2a, head; 2b, rod; 3, piston plate; 4, flat gasket; 5, mounting block; 6, bump; 7, screw seat; 7a, mounting seat; 7b, connecting rod; 8, nut; 9, spring. Specific implementation method:

[0022] The present invention is further described below with reference to specific embodiments. Figure 1 :

[0023] A check valve comprises a valve seat 1, a screw 2, a piston plate 3 and a flat gasket 4. The screw 2 comprises a head 2a and a rod 2b. The piston plate 3 is injection molded on the screw 2 and wraps the head 2a therein. The flat gasket 4 is made of rubber and is molded on the piston plate 3 by vulcanization.

[0024] like Figure 1 As shown, the piston plate 3 of the utility model is injection molded on the screw 2, and the head 2a is wrapped inside, and the flat gasket 4 is vulcanized on the piston plate 3. There is no gap between the screw 2 and the piston plate 3, between the screw 2 and the flat gasket 4, and between the flat gasket 4 and the piston plate 3, which effectively prevents leakage; and the flat gasket 4 is fixed to the piston plate 3 by vulcanization, which effectively prevents the flat gasket 4 from displacement, rolling and other problems during operation, and the check valve has good reliability.

[0025] In order to ensure the installation strength of the screw 2 while minimizing the volume of the piston plate 3, as shown in FIG. Figure 1 As shown, a mounting block 5 is formed convexly on the upper surface of the piston plate 3 , and the head 2 a is arranged in the mounting block 5 .

[0026] In order to facilitate the installation of the nut 8 on the rod portion 2b of the screw rod 2, the mounting block 5 is in the shape of a regular prism. In this embodiment, the cross section of the mounting block 5 is a regular hexagon.

[0027] In order to strengthen the connection strength between the piston plate 3 and the flat gasket 4, as Figure 1 As shown, the lower surface of the piston plate 3 is concave to form a mounting groove, and the flat gasket 4 forms a protrusion 6 at the mounting groove.

[0028] Furthermore, the installation groove and the protrusion 6 are both annular structures.

[0029] The installation structure of the screw 2 and the spring 9: a screw seat 7 is provided in the valve seat 1, the rod 2b of the screw 2 is slidably arranged in the screw seat 7, a nut 8 is threadedly connected to the lower end of the rod 2b, a spring 9 is sleeved on the outside of the rod 2b, the upper end of the spring 9 abuts against the screw seat 7, and the lower end abuts against the nut 8.

[0030] The structure of the screw seat 7: Figure 1As shown, the screw seat 7 includes a mounting seat 7a and a connecting rod 7b, a plurality of connecting rods 7b are provided and distributed on the outer periphery of the mounting seat 7a, one end of the connecting rod 7b is connected to the valve seat 1, and the other end is connected to the mounting seat 7a, and the rod portion 2b of the screw 2 is slidably arranged in the mounting seat 7a. In this embodiment, three connecting rods 7b are provided, and the circumference is evenly distributed on the outer periphery of the mounting seat 7a.

[0031] In order to ensure a firm connection and reduce assembly steps, the screw seat 7 and the valve seat 1 are an integrated structure.

[0032] In order to guide the spring 9, the middle part of the mounting seat 7a is a cylinder, and the lower end is a truncated cone with a larger diameter at the top and smaller diameter at the bottom. The upper end of the spring 9 is sleeved outside the truncated cone, and the connecting rod 7b is connected to the cylinder.

[0033] Preferably, the diameter of the cylinder is larger than the maximum diameter of the frustum.

[0034] The working principle of the utility model is as follows: the water pressure pushes the flat gasket 4 and the piston plate 3 upwards, drives the screw rod 2 to move upwards, compresses the spring 9, and opens the check valve; when there is no water pressure, the screw rod 2 moves downwards under the elastic force of the spring 9, the flat gasket 4 seals the water outlet of the valve seat 1, and the check valve is closed.

[0035] The above embodiment is only one of the preferred embodiments of the present utility model, and is not intended to limit the scope of implementation of the present utility model. Therefore, any equivalent changes made based on the shape, structure, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A check valve, comprising a valve seat (1), a screw (2), a piston plate (3) and a flat gasket (4), characterized in that: The screw (2) comprises a head (2a) and a rod (2b); the piston plate (3) is injection-molded on the screw (2) and wraps the head (2a) therein; the flat gasket (4) is made of rubber and is vulcanized on the piston plate (3).

2. A check valve according to claim 1, characterized in that: A mounting block (5) is convexly formed on the upper surface of the piston plate (3), and the head (2a) is arranged in the mounting block (5).

3. A check valve according to claim 2, characterized in that: The mounting block (5) is in the shape of a regular prism.

4. A check valve according to claim 1, characterized in that: The lower surface of the piston plate (3) is concave to form a mounting groove, and the flat gasket (4) forms a convex block (6) at the mounting groove.

5. A check valve according to claim 4, characterized in that: The installation groove and the protrusion (6) are both annular structures.

6. A check valve according to claim 1, characterized in that: A screw seat (7) is provided inside the valve seat (1), a rod portion (2b) of the screw (2) is slidably arranged inside the screw seat (7), a nut (8) is threadedly connected to the lower end of the rod portion (2b), a spring (9) is sleeved outside the rod portion (2b), the upper end of the spring (9) abuts against the screw seat (7), and the lower end abuts against the nut (8).

7. A check valve according to claim 6, characterized in that: The screw seat (7) comprises a mounting seat (7a) and a connecting rod (7b), a plurality of connecting rods (7b) are provided and distributed on the periphery of the mounting seat (7a), one end of the connecting rod (7b) is connected to the valve seat (1), and the other end is connected to the mounting seat (7a), and the rod portion (2b) of the screw (2) is slidably arranged in the mounting seat (7a).

8. A check valve according to claim 7, characterized in that: The middle part of the mounting seat (7a) is a cylinder, and the lower end is a truncated cone with a larger diameter at the top and smaller diameter at the bottom. The upper end of the spring (9) is sleeved outside the truncated cone, and the connecting rod (7b) is connected to the cylinder.

Images