Check valve for water pump

Abstract

The utility model relates to a check valve for a water pump, belongs to the field of water pump accessories, and provides the check valve for the water pump to solve the problem that an existing check valve adopts a variable-diameter spring and is prone to damage and failure, the check valve for the water pump comprises a seat body and a valve rod arranged on the seat body in a penetrating mode, the seat body is provided with a water passing opening, one end of the valve rod is provided with a sealing cover, and the valve rod is further sleeved with a spring. The sealing cover is arranged at the water passing opening in a matched mode and achieves returning through the spring, the spring is an equal-diameter spring, an extending section is arranged on the base body, and the spring is arranged on the extending section in a sleeved mode. One end of the spring is limited by the valve rod, the other end of the spring is limited by the extension section, compared with a variable-diameter spring, the equal-diameter spring is not prone to shaking, when the sealing cover leaves the water passing opening due to external force, the equal-diameter spring is limited by the shape of the equal-diameter spring and the extension section, then the valve rod is limited to transversely move within a small range, and therefore the valve rod is protected; and the spring can be protected from being damaged.

Description

TECHNICAL FIELD

[0001] The utility model belongs to the field of water pump accessories, especially relates to a check valve for water pump. BACKGROUND

[0002] The check valve, also called check valve or one-way valve, its opening and closing device (valve clapper) is closed by the action of medium to stop the reverse flow, that is, the medium can only flow in one direction. The check valve usually has an opening for fluid flow, a sealing plug is arranged at the opening, and a spring is used as a return member of the sealing plug, so that the sealing plug is always filled in the opening when not subjected to external force, to ensure the one-way flow of fluid. When used on a water pump, the check valve is usually arranged at the water outlet, which can discharge excess gas during operation and prevent fluid backflow. However, due to the frequent opening and closing of the check valve, especially in the case of unstable medium flow, the check valve will be opened and closed continuously. The existing structure usually uses a variable diameter spring, but this spring will cause shaking during return, which will cause the position of the sealing plug to deviate, thereby reducing the sealing effect. When the position deviates, the spring is subjected to uneven force, which can easily cause damage to the spring. Accumulation of multiple times can cause damage and failure of the check valve, thereby affecting the service life of the check valve. Once the check valve is damaged, it may cause the medium to flow backward, and even the entire system needs to be stopped for maintenance, increasing the maintenance cost. SUMMARY

[0003] In view of the problem that the existing check valve using a variable diameter spring is prone to damage and failure, the utility model provides a check valve for water pump, which effectively reduces the shaking of the valve rod during movement by cooperation of the equal diameter spring and the extension section.

[0004] The utility model adopts the technical scheme as follows: a check valve for water pump, comprising a seat body and a valve rod penetrating the seat body, the seat body is provided with a water outlet, one end of the valve rod is provided with a sealing cover, a spring is further sleeved on the valve rod, the sealing cover is matched at the water outlet, and the spring is returned by the spring, the spring is an equal diameter spring, an extension section is arranged on the seat body, and the spring is sleeved on the extension section.

[0005] One end of the spring is limited by the valve rod, and the other end is limited by the extension section. Compared with the variable diameter spring, the equal diameter spring is not prone to shaking. The extension section not only limits the shaking amplitude of the spring, but also shortens the distance between the seat body and the end of the valve rod. When the sealing cover is subjected to external force and leaves the water outlet, the equal diameter spring is limited by its own shape and the extension section, thereby limiting the lateral movement of the valve rod in a small range. This protects the valve rod and protects the spring from damage.

[0006] Further, the end of the valve rod is provided with a baffle, the outer diameter of the baffle is larger than the outer diameter of the spring, and the outer diameter of the spring is larger than the outer diameter of the extension section, which can ensure smooth movement of the spring, prevent the spring from falling out, and avoid oversize of the valve rod.

[0007] Further, the seat body is provided with a hollow seat connected to the inner wall of the seat body through radially arranged connecting rods, the valve rod passes through the hollow seat, and the extension section is integrally formed with the hollow seat. The radially arranged connecting rods not only have an aesthetic appearance but also increase the connection strength between the hollow seat and the seat body. The seat body structure can be formed by casting to reduce defects of parts.

[0008] Further, the adjacent two connecting rods form a water passing area for water flow. When the sealing cover is removed from the water passing opening, most of the fluid flows through the area between the connecting rods and does not impact the inside of the hollow seat.

[0009] As an improvement, the hollow seat and the extension section are arranged with the same diameter. In this arrangement, the extension section is part of the hollow seat, and the mold design is not too complex during manufacturing, facilitating molding.

[0010] As another improvement, the outer diameter of the hollow seat is larger than that of the extension section, and a transition step is formed at the connection between the hollow seat and the extension section.

[0011] Further, the outer side of the sealing cover is also provided with a pull ring, which facilitates the removal of the sealing cover by external force. The sealing cover is provided with a threaded through hole, the end of the valve rod is a threaded end, the threaded end is fitted into and protrudes from the threaded through hole, and the pull ring is connected to the threaded end. The pull ring is connected to the valve rod, and the sealing cover is clamped between the two, which can not only reduce the assembly difficulty but also reduce the molding difficulty of the sealing cover.

[0012] Further, the seat body is provided with an outwardly extending assembly ring, and the end face of the assembly ring is flush with the end face of the connecting rod. The check valve is usually arranged at the water outlet of the pump body, and the assembly ring is arranged to facilitate the mounting on the side wall of the water outlet.

[0013] Further, the sealing cover is provided with an elastic pad located on the side of the sealing cover facing the water passing opening. The elastic pad can fill the gap between the sealing cover and the water passing opening, ensuring the sealing effect, and also providing good anti-collision effect when the sealing cover is returned to the water passing opening along with the valve rod.

[0014] Further, the seat body is made of brass, and the valve rod is made of stainless steel. The brass material can effectively reduce the rust of the seat body and has good plasticity, facilitating processing and molding. In addition, it has good heat conduction performance, which can effectively reduce the local accumulation of heat. The valve rod made of stainless steel is a standard part that can be purchased directly, is easy to obtain, and has low cost.

[0015] The beneficial effects of this utility model are as follows: This application is a check valve for water pumps. By setting an equal-diameter spring to reduce the spring's own sway and setting an extension section on the seat to limit the spring's swing, the sway generated when the valve stem moves is reduced, the valve stem is protected, and the service life of the spring is guaranteed. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the overall structure of the check valve for the water pump in Example 1;

[0017] Figure 2 This is a schematic diagram of the assembly structure of the check valve for the water pump in Example 1;

[0018] Figure 3 This is a schematic diagram of the connection between the valve stem and the sealing cap in Example 1;

[0019] Figure 4 This is a schematic diagram of the structure of the seat in Example 1;

[0020] Figure 5 This is a schematic diagram of the connection between the valve stem and the sealing cap in Example 2;

[0021] Wherein: 1-seat body; 11-extension section; 12-water inlet; 13-hollow seat; 14-connecting rod; 15-transition step; 16-assembly ring; 17-water passage area; 18-annular wall; 2-valve stem; 3-sealing cover; 31-pull ring; 32-elastic pad; 33-threaded seat; 4-spring; 5-baffle. Detailed Implementation

[0022] The technical solutions of the embodiments of this utility model will be explained and described below with reference to the accompanying drawings. However, the following embodiments are only preferred embodiments of this utility model and not all of them. Other embodiments obtained by those skilled in the art based on the embodiments in the implementation methods without creative effort are all within the protection scope of this utility model.

[0023] Example 1

[0024] This embodiment is a check valve for a water pump, such as... Figures 1 to 4 As shown, the device includes a seat 1 and a valve stem 2 mounted on the seat 1. The seat 1 has a water inlet 12. One end of the valve stem 2 has a sealing cap 3. A spring 4 is also fitted onto the valve stem 2. The sealing cap 3 fits into the water inlet 12 and returns to its original position via the spring 4. The spring 4 is a constant diameter spring. The seat 1 has an extension section 11, on which the spring 4 is fitted. The valve stem 2 and the sealing cap 3 are connected by a thread, which allows for easy unidirectional assembly of the valve stem 2 onto the seat 1, effectively reducing collisions. (Details follow...) Figure 3As shown, one end of the valve rod 2 can be a threaded end, the sealing cover 3 is provided with a threaded seat 33 with internal threads, and the threaded end is arranged on the threaded seat 33 to achieve detachable cooperation.

[0025] One end of the spring 4 is limited by the valve rod 2, and the other end is limited by the extension section 11. Compared with the variable-diameter spring 4, the constant-diameter spring 4 is not prone to shaking. When the sealing cover 3 is separated from the water passage 12 due to external force, the constant-diameter spring 4 is limited by its own shape and the extension section 11, thereby limiting the lateral movement of the valve rod 2 within a smaller range, and the valve rod 2 is more likely to pass through the seat body 1. In this way, the valve rod 2 is protected, and the spring 4 is also protected from damage.

[0026] The end of the valve rod 2 is provided with a baffle 5, the outer diameter of the baffle 5 is greater than the outer diameter of the spring 4, and the outer diameter of the spring 4 is greater than the outer diameter of the extension section 11. This arrangement can ensure smooth movement of the spring 4 to prevent the spring 4 from falling out, and can also avoid excessive size of the valve rod 2. In the embodiment, the end of the valve rod 2 is hemispherical, and the smooth surface faces outward. The flat part can block the baffle 5. This shape can ensure that the end of the valve rod 2 has sufficient strength and is easy to form.

[0027] The seat body 1 is provided with a hollow seat 13, the hollow seat 13 is connected to the inner wall of the seat body 1 through radially arranged connecting rods 14, the valve rod 2 passes through the hollow seat 13, and the extension section 11 is integrally formed with the hollow seat 13. The radially arranged connecting rods 14 not only have an aesthetic appearance but also increase the connection strength of the hollow seat 13 and the seat body 1. The seat body 1 structure can be formed by casting to reduce defects of parts.

[0028] Adjacent two connecting rods 14 form a water passage area 17 for water flow. When the sealing cover 3 is moved away from the water passage 12, most of the fluid flows through the area between the connecting rods 14, and does not impact the inside of the hollow seat 13.

[0029] The outer diameter of the hollow seat 13 is greater than that of the extension section 11, and a transition step 15 is formed at the connection between the hollow seat 13 and the extension section 11. The end of the constant-diameter spring 4 can be limited by the transition step 15,

[0030] The seat body 1 is provided with an outwardly extending assembly ring 16, and the end face of the assembly ring 16 is flush with the end face of the connecting rod 14. The check valve is usually arranged at the water outlet of the pump body, and the assembly ring 16 is arranged to facilitate the assembly on the side wall of the water outlet. The seat body 1 is also provided with an annular wall 18 integrally formed with the assembly ring 16, the annular wall 18 surrounds an area to form the water passage 12, the inner wall of the annular wall 18 is integrated with the assembly ring 16, and the outer wall diameter of the annular wall 18 is smaller than that of the assembly ring 16. In this way, the sealing plug does not have to be too large in size.

[0031] The sealing cap 3 is provided with an elastic pad 32, which is located on the side of the sealing cap 3 facing the water inlet 12. The elastic pad 32 covers the end face of the sealing cap 3 facing the water inlet. The elastic pad 32 can be formed directly on the surface of the sealing cap by injection molding after the sealing cap is formed, or a pre-made elastic pad 32 can be directly fitted onto the surface of the sealing cap 3. In this way, the elastic pad 32 can fill the gap between the sealing cap 3 and the water inlet 12, ensuring a sealing effect. In addition, the elastic pad 32 also serves as an anti-collision device, preventing damage to the seat 1 from a hard impact when the sealing cap returns to its original position.

[0032] The seat 1 is made of brass, and the valve stem 2 is made of stainless steel. Brass effectively reduces corrosion of the seat 1, has good plasticity, is easy to process and shape, and also has good thermal conductivity, effectively reducing localized heat accumulation. The stainless steel valve stem is a standard part, readily available, and inexpensive.

[0033] Example 2

[0034] like Figure 5 As shown, the difference between this embodiment and Embodiment 1 is that a pull ring 31 is also provided on the outer side of the sealing cover 3, which facilitates pulling out the sealing cover 3 by external force. The hollow seat 13 and the extension section 11 are set with the same diameter. In this setting, the extension section 11 is a part of the hollow seat 13, and the mold design does not need to be too complicated during manufacturing, which is convenient for molding. In this embodiment, the sealing cover 3 is provided with a threaded through hole, and the valve stem 2 adopts a cross-grooved flat round head screw. The length of the threaded end of the valve stem 2 is greater than the depth of the threaded through hole. When the valve stem 2 is assembled on the sealing cover 3, the threaded end of the valve stem 2 protrudes from the sealing cover 3. The pull ring 31 is provided with a threaded hole, and the knob is on the threaded end protruding from the sealing cover 3. To ensure a firm connection, sealant can also be applied to the surface of the threaded end to make the valve stem 2 and the pull ring 31, and the valve stem 2 and the sealing cover 3 firmly connected.

[0035] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Those skilled in the art should understand that this utility model includes, but is not limited to, the content described in the accompanying drawings and the specific embodiments above. Any modifications that do not depart from the functional and structural principles of this utility model will be included within the scope of the claims.

Claims

1. A check valve for a water pump, characterized by comprising: The utility model provides a valve, which comprises a seat body (1) and a valve stem (2) arranged on the seat body (1), wherein the seat body (1) is provided with a water passage (12), one end of the valve stem (2) is provided with a sealing cover (3), a spring (4) is arranged on the valve stem (2), the sealing cover (3) is matched at the water passage (12) and is returned by the spring (4), the spring (4) is an equal-diameter spring (4), the seat body (1) is provided with an extension section (11), and the spring (4) is arranged on the extension section (11).

2. The check valve for a water pump according to claim 1, characterized by An end of the valve stem (2) is provided with a baffle (5), the outer diameter of the baffle (5) is greater than the outer diameter of the spring (4), and the outer diameter of the spring (4) is greater than the outer diameter of the extension section (11).

3. The check valve for a water pump according to claim 1 or 2, characterized in that, The seat body (1) is provided with a hollow seat (13), the hollow seat (13) is connected to the inner wall of the seat body (1) through a plurality of radially arranged connecting rods (14), the valve stem (2) passes through the hollow seat (13), and the extension section (11) is integrally formed with the hollow seat (13).

4. The check valve for a water pump according to claim 3, characterized by A water passage area (17) is formed between two adjacent connecting rods (14) for water flow.

5. The check valve for a water pump according to claim 3, characterized by The hollow seat (13) and the extension section (11) are equal in diameter.

6. The check valve for a water pump according to claim 3, characterized by The outer diameter of the hollow seat (13) is greater than that of the extension section (11), and a transition step (15) is formed at the connection between the hollow seat (13) and the extension section (11).

7. The check valve for a water pump according to claim 4, characterized by The seat body (1) is provided with an outwardly extending assembly ring (16), and the end face of the assembly ring (16) is flush with the end face of the connecting rod (14).

8. The check valve for a water pump according to claim 1, characterized by The outer side of the sealing cover (3) is further provided with a pull ring (31), the sealing cover (3) is provided with a threaded through hole, the end of the valve stem (2) is a threaded end, the threaded end is matched with and protrudes from the threaded through hole, and the pull ring (31) is connected to the threaded end.

9. The check valve for a water pump according to claim 1 or 8, characterized in that, The sealing cover (3) is provided with an elastic pad (32), and the elastic pad (32) is located on the side of the sealing cover (3) facing the water passage (12).

10. The check valve for a water pump according to claim 1, characterized by The seat body (1) is made of brass, and the valve stem (2) is made of stainless steel.

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