Agricultural pump pressure relief valve with good sealing effect

Abstract

The utility model discloses an agricultural pump pressure relief valve with a good sealing effect, and belongs to the technical field of pressure relief valves, the agricultural pump pressure relief valve comprises a valve casing, a valve cover, a spring and a valve core, the valve cover is fixedly arranged at the top of the valve casing, the spring is vertically arranged in the valve casing, the bottom end of the valve casing is vertically communicated with a connecting pipe, and the outer wall of the valve casing is transversely communicated with a water outlet pipe; a base is arranged in the valve shell, the valve element comprises a first step and a second step which are distributed from top to bottom, and the top of the first step is in contact with the bottom of the spring, so that the upper end of the spring is in extrusion contact with the valve cover; a first sealing piece is fixedly arranged on the edge of the bottom of the first step, the bottom of the first sealing piece makes contact with the upper end of the base, a second sealing piece is fixedly arranged on the edge of the bottom of the second step, and the bottom of the second sealing piece makes contact with the bottom end of the interior of the base. Meanwhile, a sealing layer is added at the contact part to improve the sealing effect of the valve core.

Description

Technical Field

[0001] This utility model relates to the field of pressure relief valve technology, specifically to a pressure relief valve for agricultural pumps with good sealing effect. Background Technology

[0002] A pressure relief valve is a fluid control device whose main function is to automatically open when the system pressure exceeds a set value, releasing excess medium pressure to ensure that the system pressure remains within a safe range. Its working principle is based on the pressure balance principle; when the system pressure rises to the set value, the valve disc automatically opens and releases pressure under pressure, overcoming resistance such as spring force or counterweight force.

[0003] Currently, spring-loaded pressure relief valves rely on the spring force to maintain the seal between the valve disc and the valve seat. When the internal system pressure of the agricultural pump exceeds the spring's set value, the valve disc is pushed open to release the pressure.

[0004] Existing agricultural pump sealing structures rely on valve core sealing. After long-term operation, the valve core wears down, and gaps easily form between the valve core and the valve body. These gaps can lead to leakage in the pressure relief valve, affecting its service life. Therefore, it is necessary to propose an agricultural pressure relief valve with good sealing performance, along with an automatic feeding and mixing device. Utility Model Content

[0005] The purpose of this utility model is to provide an agricultural pump pressure relief valve with good sealing effect, so as to solve the above-mentioned technical problems to a certain extent and improve the sealing performance of the valve core part of the pressure relief valve.

[0006] To achieve the above objectives, this utility model provides the following technical solution: including a valve body, a valve cover, a spring, and a valve core, wherein the valve cover is fixedly installed on the top of the valve body, the spring is vertically installed inside the valve body, a connecting pipe is vertically connected to the bottom of the valve body, and a water outlet pipe is horizontally connected to the outer wall of the valve body;

[0007] The valve housing is provided with a base inside, and the valve core includes a first step and a second step distributed from top to bottom. The top of the first step contacts the bottom of the spring, so that the upper end of the spring is pressed against the valve cover.

[0008] A first sealing element is fixedly provided at the bottom edge of the first step, and the bottom of the first sealing element contacts the upper end of the base. A second sealing element is fixedly provided at the bottom edge of the second step, and the bottom of the second sealing element contacts the inner bottom end of the base. The outer ring of the second step contacts the inner side of the base. A valve ball is fixedly provided at the middle part of the bottom of the second step, and the valve ball extends into the connecting pipe through the base.

[0009] Preferably, the first seal is annular in shape, the outer diameter of the first seal is the same as the diameter of the first step, and the inner ring of the first seal is in contact with the outer ring of the second step.

[0010] Preferably, the second seal is annular in shape, the outer ring diameter of the second seal is the same as the outer ring diameter of the second step, the outer ring of the second seal contacts the inner edge of the base, and the inner ring of the second seal contacts the protruding edge of the valve ball.

[0011] Preferably, the outer wall of the second step is slidably connected to the inner wall of the valve housing, and a circular hole matching the valve ball is opened in the middle part of the bottom of the base, with one end of the valve ball tightly inserted into the circle.

[0012] Preferably, both the first and second seals are made of polytetrafluoroethylene or fluororubber.

[0013] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0014] In use, this utility model divides the valve core of the pressure relief valve into a first step and a second step, and respectively sets a first sealing element and a second sealing element at the bottom of the first step and the second step. The first sealing element is set at the contact part between the first step and the upper end of the inner base of the valve body, and the second sealing element is set at the contact part between the second step and the bottom inner side of the base. Through the step contact sealing method, the sealing area between the valve core and the valve body is increased. At the same time, the increased sealing material further improves the sealing effect between the valve core and the valve body, thereby increasing the service life of this pressure relief valve. Attached Figure Description

[0015] To more clearly illustrate the technical solutions of the embodiments of this utility model, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a schematic diagram of the overall planar cross-sectional structure of this embodiment;

[0017] Figure 2 This is a schematic diagram of the overall three-dimensional structure of this embodiment;

[0018] Figure 3 This is a schematic diagram of the three-dimensional cross-sectional structure of this embodiment;

[0019] Figure 4 This is an example. Figure 3 A magnified schematic diagram of structure A in the diagram.

[0020] The attached diagram lists the components represented by each number as follows:

[0021] 1. Valve body; 11. Outlet pipe; 12. Connecting pipe; 2. Valve cover; 3. Spring; 4. Valve core; 41. First step; 42. Second step; 5. First seal; 6. Base; 7. Valve ball. Detailed Implementation

[0022] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of the present utility model.

[0023] Please see Figure 1-4 This utility model provides a technical solution: an agricultural pump pressure relief valve with good sealing effect, including a valve body 1, a valve cover 2, a spring 3, and a valve core 4. The valve cover 2 is fixedly installed on the top of the valve body 1, the spring 3 is vertically installed inside the valve body 1, a connecting pipe 12 is vertically connected to the bottom of the valve body 1, and a water outlet pipe 11 is horizontally connected to the outer wall of the valve body 1.

[0024] The valve housing 1 is provided with a base 6 inside. The valve core 4 includes a first step 41 and a second step 42 distributed from top to bottom. The top of the first step 41 contacts the bottom of the spring 3, so that the upper end of the spring 3 is pressed against the valve cover 2.

[0025] A first sealing element 5 is fixedly installed at the bottom edge of the first step 41, and the bottom of the first sealing element 5 contacts the upper end of the base 6. A second sealing element 8 is fixedly installed at the bottom edge of the second step 42, and the bottom of the second sealing element 8 contacts the inner bottom end of the base 6. The outer ring of the second step 42 contacts the inner side of the base 6. A valve ball 7 is fixedly installed at the middle part of the bottom of the second step 42, and the valve ball 7 extends into the connecting pipe 12 through the base 6.

[0026] When this pressure relief valve is in use, the valve core 4 is located at the bottom of the spring 3, and the valve body 1 is connected to the outlet ring of the agricultural pump via a threaded connection. When the water pressure in the agricultural pump pipeline exceeds the set value of the pressure relief valve, the valve core 4 is pushed to move inward, and the spring 3 is squeezed. When the ball valve below the valve core 4 moves to expose the gap and release the pressure, the excess water is discharged from the outlet pipe 11.

[0027] By setting the valve core 4 of this pressure relief valve into a stepped shape, dividing it into a first step 41 and a second step 42, a first sealing element 5 and a second sealing element are respectively set at the bottom of the first step 41 and the second step 42. The first sealing element 5 is set at the contact part between the first step 41 and the upper end of the inner base 6 of the valve body 1, and the second sealing element is set at the contact part between the second step 42 and the bottom inner side of the base 6. Through the stepped contact sealing form, the sealing area between the valve core 4 and the valve body 1 is increased, and the increased sealing material further improves the sealing effect between the valve core 4 and the valve body 1.

[0028] See Figure 3 and Figure 4 In some embodiments, the first seal 5 is annular in shape, the outer diameter of the first seal 5 is the same as the diameter of the first step 41, the inner ring of the first seal 5 contacts the outer ring of the second step 42, the second seal 8 is annular in shape, the outer diameter of the second seal 8 is the same as the outer diameter of the second step 42, the outer ring of the second seal 8 contacts the inner edge of the base 6, and the inner ring of the second seal 8 contacts the protruding edge of the valve ball 7.

[0029] The outer diameter of the first sealing element 5 is the same as the outer diameter of the first step 41. This avoids excessive friction between the edge of the first sealing element 5 and the inner wall of the valve body 1 while achieving a sealing effect. The first sealing element 5 is annular and fits well with the contact area between the first step 41 and the base 6, achieving a good sealing effect. The second sealing element 8 is also annular and fully seals the contact area between the second step 42 and the bottom inner side of the base 6.

[0030] See Figure 2 In some embodiments, the outer wall of the second step 42 is slidably connected to the inner wall of the valve housing 1, and a circular hole matching the valve ball 7 is opened in the middle part of the bottom of the base 6, with one end of the valve ball 7 tightly inserted into the circle.

[0031] The round hole at the bottom of the base 6 allows one end of the valve ball 7 to extend into the connecting pipe 12 through the base 6, so as to contact the internal pressure of the pump.

[0032] See Figure 2 and Figure 4 In some embodiments, both the first seal 5 and the second seal 8 are made of polytetrafluoroethylene or fluororubber.

[0033] The first seal 5 and the second seal 8 are made of polytetrafluoroethylene and fluororubber, respectively, which have good sealing performance and corrosion resistance, and are suitable for use in agricultural pumps.

[0034] In the description of this utility model, it should be understood that the terms "coaxial", "bottom", "one end", "top", "middle", "other end", "upper", "side", "top", "inner", "front", "center", "both ends", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0035] In this utility model, unless otherwise explicitly specified and limited, the terms "installation", "setting", "connection", "fixing", "screw connection", etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal connection of two components or the interaction between two components. Unless otherwise explicitly limited, those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0036] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A pressure relief valve for an agricultural pump with good sealing effect, comprising a valve housing (1), a valve cover (2), a spring (3), and a valve core (4), wherein the valve cover (2) is fixedly disposed on the top of the valve housing (1), and the spring (3) is vertically disposed inside the valve housing (1), characterized in that: A connecting pipe (12) is vertically connected to the bottom end of the valve housing (1), and a water outlet pipe (11) is horizontally connected to the outer wall of the valve housing (1). The valve housing (1) is provided with a base (6) inside. The valve core (4) includes a first step (41) and a second step (42) distributed from top to bottom. The top of the first step (41) contacts the bottom of the spring (3), so that the upper end of the spring (3) is pressed against the valve cover (2). A first sealing element (5) is fixedly provided at the bottom edge of the first step (41). The bottom of the first sealing element (5) contacts the upper end of the base (6). A second sealing element (8) is fixedly provided at the bottom edge of the second step (42). The bottom of the second sealing element (8) contacts the inner bottom end of the base (6). The outer ring of the second step (42) contacts the inner side of the base (6). A valve ball (7) is fixedly provided at the middle part of the bottom of the second step (42). The valve ball (7) extends into the connecting pipe (12) through the base (6).

2. The agricultural pump pressure relief valve with good sealing effect according to claim 1, characterized in that: The first seal (5) is annular in shape. The outer diameter of the first seal (5) is the same as the diameter of the first step (41). The inner ring of the first seal (5) is in contact with the outer ring of the second step (42).

3. The agricultural pump pressure relief valve with good sealing effect according to claim 1, characterized in that: The second seal (8) is annular in shape. The outer diameter of the second seal (8) is the same as the outer diameter of the second step (42). The outer ring of the second seal (8) contacts the inner edge of the base (6), and the inner ring of the second seal (8) contacts the protruding edge of the valve ball (7).

4. The agricultural pump pressure relief valve with good sealing effect according to claim 1, characterized in that: The outer wall of the second step (42) is slidably connected to the inner wall of the valve housing (1). A round hole matching the valve ball (7) is opened in the middle part of the bottom of the base (6). One end of the valve ball (7) is tightly inserted into the circle.

5. The agricultural pump pressure relief valve with good sealing effect according to claim 4, characterized in that: Both the first seal (5) and the second seal (8) are made of polytetrafluoroethylene or fluororubber.

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