Anti-fatigue check valve for water pump

Abstract

The anti-fatigue check valve for the water pump comprises a valve seat and a valve rod, a valve port is formed in the valve seat, the valve rod is arranged on the valve seat in a penetrating mode and can slide up and down relative to the valve seat, and a valve plate assembly used for blocking the valve port is arranged at the first end of the valve rod. A reset spring is further arranged between the valve rod and the valve seat, the reset spring can enable the valve rod to always keep the upward moving trend so as to drive the valve block assembly to block the valve port without external force, a first limiting part extending upwards is arranged on the valve seat, and a second limiting part capable of being matched with the first limiting part is arranged at the second end, located above the valve seat, of the valve rod. The valve plate assembly arranged at the first end of the valve rod can overcome the elastic force of the reset spring under the impact effect of water flow to drive the valve rod to move downwards so as to open a valve port formed in the valve seat, meanwhile, the valve rod can be limited to move downwards excessively under the mutual limiting effect of the first limiting part and the second limiting part, and therefore the reset spring is prevented from being compressed to the limit state; therefore, the fatigue strength of the reset spring is improved, and finally the service life of the check valve is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of check valves, in particular to a fatigue-resistant check valve for a water pump. Background Art

[0002] A check valve refers to a valve that automatically opens and closes the valve disc by the flow of the medium itself to prevent the medium from flowing back. It is also called a non-return valve, a one-way valve, a reverse flow valve, and a back pressure valve. A check valve is an automatic valve, and its main function is to prevent the medium from flowing back, to prevent the pump and the driving motor from reversing, and to prevent the medium in the container from being released. The check valve used in existing water pumps is generally installed in the water inlet. Its structure includes a valve seat with a valve port, a valve stem that is inserted on the valve seat and can slide up and down, and one end of the valve stem is connected to a valve plate for blocking the valve port. The valve plate is located below the valve seat, and the valve stem is also sleeved with a spring to keep the valve stem from moving upward so that the valve plate blocks the valve port. When water flows normally through the water inlet, the impact of the water flow will push the valve plate, and the valve plate and the valve stem will overcome the elastic force of the spring and slide in the direction of opening the valve port. At this time, the valve port is open, and the water flows into the pump casing through the valve port and finally flows out from the outlet of the pump casing. When the motor stops working and the water no longer flows in from the water inlet, the valve stem will, under the action of the spring, drive the valve plate to block the movement in the direction of the valve port to prevent water from flowing back.

[0003] However, when this type of check valve is in normal working condition, under the action of the strong impact force of the water flow, the valve mouth will be opened to the maximum rotation state, and the spring on the valve stem will always be in the limit state of its elastic force. Long-term compression work will reduce the fatigue strength of the spring, thereby reducing the service life of the spring, and eventually causing the entire check valve to malfunction and cannot be used normally.

[0004] Therefore, how to provide a check valve that can improve the fatigue strength of the spring of the check valve without affecting the normal operation of the check valve is an urgent problem to be solved by those skilled in the art. Utility Model Content

[0005] The technical problem to be solved by the utility model is to provide a fatigue-proof water pump check valve which can limit the transition downward movement of the valve stem and improve the fatigue strength of the spring of the check valve in view of the above-mentioned prior art.

[0006] The utility model adopts the following technical solution to solve the above technical problems: a fatigue-proof check valve for a water pump, comprising a valve seat and a valve stem, the valve seat having a valve port for water flow to pass through, the valve stem being inserted into the valve seat and being able to slide up and down relative to the valve seat, a valve plate assembly for blocking the valve port being provided at the first end of the valve stem located below the valve seat, a return spring which can keep the valve stem in an upward movement trend so as to drive the valve plate assembly to block the valve port without external force being provided between the valve stem and the valve seat, a first limiting portion extending upward being provided on the valve seat, a second limiting portion which can be adapted to the first limiting portion being provided at the second end of the valve stem located above the valve seat, the valve plate assembly being able to overcome the elastic force of the return spring under the impact of water flow and drive the valve stem to move downward to open the valve port, and in the process of the valve stem moving from top to bottom, the second limiting portion can resist the first limiting portion and limit the valve stem from being excessively moved downward so as to improve the fatigue strength of the return spring.

[0007] In order to optimize the overall structure of the first limiting portion so that it can better limit the transition downward movement of the valve stem, preferably, the first limiting portion is columnar and has a through hole for the valve stem to pass through up and down, the first limiting portion is higher than the top of the valve seat, and the return spring is sleeved on the outer peripheral side of the first limiting portion.

[0008] In order to make the first limiting portion better fit between the valve stem, the valve seat and the return spring, preferably, the first limiting portion is arranged at the axis center of the valve seat, and a plurality of connecting arms extending inwardly for connecting the first limiting portion are formed on the valve seat, and the bottom of the return spring is rested on the connecting arms and is sleeved on the outer peripheral side of the first limiting portion.

[0009] In order to optimize the overall structure of the second limiting portion so that it can better limit each other with the first limiting portion, preferably, the second end of the valve stem is connected to a detachable cover plate, and the cover plate forms the aforementioned second limiting portion. The top of the return spring abuts against the bottom of the cover plate, and during the movement of the valve stem from top to bottom, the bottom of the cover plate can abut against the top of the first limiting portion to limit the valve stem from being moved downward excessively.

[0010] In order to better prevent the reset spring from horizontally deviating, preferably, the outer edge of the cover plate is also formed with a curling edge folded downward, and the top of the reset spring is built into the space surrounded by the curling edge.

[0011] In order to optimize the overall structure of the valve plate assembly so that it can better close or open the valve port, preferably, the valve plate assembly includes a fixed plate and a sealing gasket made of a flexible material, the fixed plate is integrally formed at the first end of the valve stem, and the sealing gasket is fixed on the fixed plate.

[0012] In order to enable the water flow to better form an impact force from top to bottom so as to better open the valve port, preferably, the top of the valve port of the valve seat is formed with an inclined surface that can form a bell mouth at the top of the valve port, and each connecting arm is connected between the inclined surface and the first limiting portion.

[0013] In order to better prevent debris from entering the valve port from top to bottom, preferably, the upper end surface of the valve seat is formed with a groove that can pass through the valve port, and a filter screen is placed in the groove to prevent debris from entering the valve port from top to bottom, and the bottom of the return spring is against the filter screen so that the filter screen is pressed in the groove.

[0014] In order to enable the entire check valve to be better installed on the water pump, preferably, a sealing ring made of a flexible material is provided on the outer periphery of the valve seat, an annular groove is formed on the inner ring surface of the sealing ring, and a flange that can be embedded in the groove is formed on the outer peripheral surface of the valve seat.

[0015] Compared with the prior art, the advantages of the present invention are: by arranging a first limiting portion extending upward on the valve seat, and by arranging a second limiting portion which can be adapted to the first limiting portion at the second end of the valve stem located above the valve seat, the valve plate assembly arranged at the first end of the valve stem can overcome the elastic force of the return spring under the impact of the water flow to drive the valve stem to move downward and open the valve port arranged on the valve seat, and at the same time, the valve stem can be restricted from transitioning downward under the mutual limitation of the first limiting portion and the second limiting portion, thereby avoiding the return spring from being compressed to the limit state, thereby improving the fatigue strength of the return spring, and finally increasing the service life of the check valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of the three-dimensional structure of this embodiment;

[0017] Figure 2 This is a bottom perspective three-dimensional structure diagram of this embodiment

[0018] Figure 3 This is a schematic diagram of the structure of the decomposed state of this embodiment;

[0019] Figure 4 This is a schematic cross-sectional view of the structure of this embodiment (the valve stem is in an ascending state);

[0020] Figure 5 It is a schematic diagram of the three-dimensional structure of Example 2 (the valve stem is in a lowered state). DETAILED DESCRIPTION

[0021] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0022] Figures 1 to 5What is shown is a schematic diagram of this embodiment. The anti-fatigue check valve for a water pump in this embodiment mainly includes a valve seat 1, a valve stem 2, a return spring 3, etc.

[0023] refer to Figures 1 to 5 As shown, the valve seat 1 has a valve port 1a for water flow to pass through, the valve stem 2 is inserted into the valve seat 1 and can slide up and down relative to the valve seat 1, the first end of the valve stem 2 located below the valve seat 1 is provided with a valve plate assembly 2a for blocking the valve port 1a, and a return spring 3 is also provided between the valve stem 2 and the valve seat 1, which can enable the valve stem 2 to always maintain an upward movement trend to drive the valve plate assembly 2a to block the valve port 1a without external force. It is characterized in that: a first limiting portion 1b extending upward is also provided on the valve seat 1, and a second limiting portion 2b capable of adapting to the first limiting portion 1b is provided at the second end of the valve stem 2 located above the valve seat 1. Under the impact of water flow, the valve plate assembly 2a can overcome the elastic force of the return spring 3 and drive the valve stem 2 to move downward to open the valve port 1a. In the process of the valve stem 2 moving from top to bottom, the second limiting portion 2b can resist the first limiting portion 1b and limit the valve stem 2 from being excessively moved downward to improve the fatigue strength of the return spring 3.

[0024] In order to optimize the overall structure of the first limiting portion 1b so that it can better limit the transition downward movement of the valve stem 2, refer to Figures 3 to 5 As shown, in this embodiment, the first limiting portion 1b is columnar and has a through hole 1b1 for the valve stem 2 to pass through. The first limiting portion 1b is higher than the top of the valve seat 1, and the return spring 3 is sleeved on the outer peripheral side of the first limiting portion 1b.

[0025] Secondly, in order to make the first limit portion 1b better fit between the valve stem 2, the valve seat 1 and the return spring 3, refer to Figure 3 As shown, in this embodiment, the first limiting portion 1b is intentionally arranged at the axis center of the valve seat 1, and a plurality of connecting arms 1c extending inwardly for connecting to the first limiting portion 1b are formed on the valve seat 1, and the bottom of the reset spring 3 is placed on the connecting arm 1c and is sleeved on the outer peripheral side of the first limiting portion 1b.

[0026] In addition, in order to optimize the overall structure of the second limiting portion 2b so that it can better limit each other with the first limiting portion 1b, refer to Figure 3 and Figure 5 As shown, in this embodiment, the second end of the valve stem 2 is connected to a detachable cover plate 2c, and the cover plate 2c is fixed to the second end of the valve stem 2 by fasteners. The cover plate 2c forms a second limiting portion 2b, and the top of the return spring 3 abuts against the bottom of the cover plate 2c. During the movement of the valve stem 2 from top to bottom, the bottom of the cover plate 2c can also abut against the top of the first limiting portion 1b to limit the valve stem 2 from being moved downward.

[0027] At the same time, in order to better prevent the upper end of the return spring 3 from horizontal deviation, refer to Figure 4As shown, in this embodiment, a downwardly folded edge 2c1 is intentionally formed on the outer edge of the cover plate 2c, and the top of the return spring 3 is built into the space surrounded by the edge 2c1.

[0028] In addition, in this embodiment, in order to optimize the overall structure of the valve plate assembly 2a so that it can better close the valve port 1a or open the valve port 1a, refer to Figure 3 and Figure 4 As shown, the valve plate assembly 2a here includes a fixed disk 2a1 and a sealing gasket 2a2 made of a flexible material. The fixed disk 2a1 is integrally formed at the first end of the valve stem 2, and the sealing gasket 2a2 is fixed on the fixed disk 2a1.

[0029] In this embodiment, in order to make the water flow form a better impact force from top to bottom so as to better open the valve port 1a, refer to Figure 3 and Figure 4 As shown, the top of the valve port 1a of the valve seat 1 is also formed with an inclined surface 1d that can form a bell-shaped top of the valve port 1a. Each connecting arm 1c is connected between the inclined surface 1d and the first limiting portion 1b. Through the special setting of the bell-shaped top, the water flow can better form an impact force to quickly open the valve port 1a.

[0030] In this embodiment, in order to better prevent debris from entering the valve port 1a from top to bottom, refer to Figure 3 As shown, a groove 1e that can penetrate the valve port 1a is specially formed on the upper end surface of the valve seat 1, and a filter screen 4 is placed in the groove 1e to prevent debris from entering the valve port 1a from top to bottom. The bottom of the return spring 3 is against the filter screen 4 so that the filter screen 4 is pressed in the groove 1e.

[0031] In this embodiment, in order to better install the entire check valve on the water pump, refer to Figure 3 and Figure 4 As shown, a sealing ring 5 made of a flexible material is also provided on the outer periphery of the valve seat 1, an annular embedding groove 5a is formed on the inner ring surface of the sealing ring 5, and a flange 1f that can be embedded in the embedding groove 5a is formed on the outer peripheral surface of the valve seat 1.

[0032] Additional explanation is required here: in the present embodiment, by providing a first limiting portion 1b extending upward on the valve seat 1, and by providing a second limiting portion 2b which can adapt to the first limiting portion 1b at the second end of the valve stem 2 located above the valve seat 1, the valve plate assembly 1a provided at the first end of the valve stem 2 can overcome the elastic force of the return spring 3 under the impact of the water flow and drive the valve stem 2 to move downward to open the valve port 1a provided on the valve seat 1, and at the same time, the valve stem 2 can be restricted from transitioning downward due to the mutual limitation of the first limiting portion 1b and the second limiting portion 2b, thereby avoiding the return spring 3 from being compressed to the limit state, thereby improving the fatigue strength of the return spring 3, and finally increasing the service life of the check valve.

[0033] It should be noted that in the description of this embodiment, the terms "front, back", "left, right", "inside, outside", "upper, lower" and the like indicating directions or positional relationships are all based on the directions or positional relationships 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 direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present invention. The terms "install", "connect", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

Claims

1. A fatigue-resistant check valve for a water pump, comprising a valve seat (1) and a valve stem (2), wherein the valve seat (1) has a valve port (1a) for water flow to pass through, the valve stem (2) is inserted into the valve seat (1) and can slide up and down relative to the valve seat (1), a valve plate assembly (2a) for blocking the valve port (1a) is provided at the first end of the valve stem (2) below the valve seat (1), and a return spring (3) is provided between the valve stem (2) and the valve seat (1) so as to enable the valve stem (2) to always maintain an upward movement trend so as to drive the valve plate assembly (2a) to block the valve port (1a) without external force, characterized in that: The valve seat (1) is also provided with a first limiting portion (1b) extending upward, and the second end of the valve stem (2) located above the valve seat (1) is provided with a second limiting portion (2b) that can adapt to the first limiting portion (1b). Under the impact of water flow, the valve plate assembly (2a) can overcome the elastic force of the return spring (3) and drive the valve stem (2) to move downward to open the valve port (1a). During the movement of the valve stem (2) from top to bottom, the second limiting portion (2b) can resist the first limiting portion (1b) and limit the valve stem (2) from being excessively moved downward to improve the fatigue strength of the return spring (3).

2. The anti-fatigue check valve for a water pump according to claim 1, characterized in that: The first limiting portion (1b) is columnar and is provided with a through hole (1b1) for the valve stem (2) to pass through up and down. The first limiting portion (1b) is higher than the top of the valve seat (1), and the return spring (3) is sleeved on the outer peripheral side of the first limiting portion (1b).

3. The anti-fatigue check valve for a water pump according to claim 2, characterized in that: The first limiting portion (1b) is arranged at the axis of the valve seat (1), and the valve seat (1) is also formed with a plurality of connecting arms (1c) extending inwardly for connecting to the first limiting portion (1b). The bottom of the return spring (3) is placed on the connecting arms (1c) and is sleeved on the outer peripheral side of the first limiting portion (1b).

4. The anti-fatigue check valve for a water pump according to claim 1, characterized in that: The second end of the valve stem (2) is connected to a detachable cover plate (2c), and the cover plate (2c) forms the aforementioned second limiting portion (2b). The top of the return spring (3) abuts against the bottom of the cover plate (2c). During the movement of the valve stem (2) from top to bottom, the bottom of the cover plate (2c) can abut against the top of the first limiting portion (1b) to limit the valve stem (2) from being moved downward.

5. The anti-fatigue check valve for a water pump according to claim 4, characterized in that: The outer edge of the cover plate (2c) is also formed with a curling edge (2c1) folded downward, and the top of the return spring (3) is built into the space surrounded by the curling edge (2c1).

6. The anti-fatigue water pump check valve according to any one of claims 1 to 5, characterized in that: The valve plate assembly (2a) comprises a fixed disk (2a1) and a sealing gasket (2a2) made of a flexible material, wherein the fixed disk (2a1) is integrally formed at the first end of the valve stem (2), and the sealing gasket (2a2) is fixed on the fixed disk (2a1).

7. The anti-fatigue check valve for a water pump according to claim 3, characterized in that: The top of the valve opening (1a) of the valve seat (1) is formed with an inclined surface (1d) which enables the top of the valve opening (1a) to form a bell mouth, and each of the connecting arms (1c) is connected between the inclined surface (1d) and the first limiting portion (1b).

8. The anti-fatigue check valve for a water pump according to claim 1, characterized in that: The upper end surface of the valve seat (1) is formed with a groove (1e) that can penetrate the valve port (1a), and a filter screen (4) is placed in the groove (1e) to prevent debris from entering the valve port (1a) from top to bottom, and the bottom of the return spring (3) is against the filter screen (4) so ​​that the filter screen (4) is pressed into the groove (1e).

9. The anti-fatigue check valve for a water pump according to claim 1, characterized in that: The outer periphery of the valve seat (1) is provided with a sealing ring (5) made of a flexible material, the inner ring surface of the sealing ring (5) is formed with an annular embedding groove (5a), and the outer peripheral surface of the valve seat (1) is formed with a flange (1f) that can be embedded in the embedding groove (5a).

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