Check valve

Abstract

According to the technical scheme, the check valve is characterized by comprising a valve body and a valve clack, the valve body is sequentially provided with an inlet, a valve cavity and an outlet in the conveying direction of the valve body, a first installation face and a second installation face are arranged in the valve body, the first installation face is located at the position where the valve cavity is communicated with the inlet, and the second installation face is located at the position where the valve cavity is communicated with the outlet. The second installation face is located at the communication position of the valve cavity and the outlet, the valve clack is arranged on the first installation face in a hinged mode, and the valve clack at least comprises a first station for blocking the valve cavity and a second station for enabling the valve cavity to be completely communicated in the valve cavity. A limiting piece and an adjusting piece are arranged on the second installation face, the adjusting piece is used for adjusting the position of the limiting piece, a limiting part is arranged on the valve clack, the limiting piece is used for being in limiting fit with the limiting part, and the check valve can always limit the position of the valve clack, avoid displacement of the valve clack and completely eradicate interference between the valve clack and a cleaning device.

Description

Technical Field

[0001] The utility model relates to a valve, and more specifically, to a check valve. Background Art

[0002] As an important device at the outlet of pumps or compressors in oil and gas transmission pipelines, a swing check valve can effectively prevent the backflow of the medium. Since wax is likely to form in oil and gas, wax deposits often adhere to the inner wall of the pipeline during the transportation of oil and gas. Over time, the wax deposits will increase continuously, resulting in a smaller and smaller flow area of the oil and gas transmission pipeline, affecting the transportation volume of oil and gas. Therefore, the oil and gas transmission pipeline needs to be pigged regularly (under the pressure of the medium in the pipeline, the pig moves in the pipeline and clears the wax deposits attached to the inner wall of the pipeline, that is, pigging and line flushing). When the pig passes through the position of the swing check valve in the pipeline, it is often blocked by the valve flap structure of the swing check valve, and it is impossible to ensure the smooth passage of the pig in the pipeline.

[0003] Therefore, the existing valve flap and check valve with the publication number of CN219975492U, through the improvement of the valve flap, when the valve flap is in the second working position, can reduce the blockage and interference of the valve flap to the pig through the design of the matching part, so that the pig can pass through the inside of the valve body smoothly.

[0004] However, during the use process, the valve flap will always be forced to close, so that one end of the valve flap will press on the cleaning device. Therefore, during repeated cleaning, the valve flap will continuously strike the cleaning device and the cleaning device will touch the valve flap back and forth, which is likely to cause damage to both of them. Summary of the Utility Model

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present utility model is to provide a check valve that can always limit the position of the valve flap, avoid the displacement of the valve flap, and eliminate the interference between the valve flap and the cleaning device.

[0006] To achieve the above purpose, the present utility model provides the following technical solution: A check valve includes a valve body and a valve flap. The valve body is sequentially provided with an inlet, a valve chamber, and an outlet along its conveying direction. A first mounting surface and a second mounting surface are arranged inside the valve body. The first mounting surface is located at the connection between the valve chamber and the inlet, and the second mounting surface is located at the connection between the valve chamber and the outlet. The valve flap is hinged on the first mounting surface. The valve flap in the valve chamber includes at least a first working position for blocking the valve chamber and a second working position for completely conducting the valve chamber.

[0007] A limiting member and an adjusting member are arranged at the second mounting surface. The adjusting member is used to adjust the position of the limiting member. A limiting portion is arranged on the valve flap. The limiting member is used to form a limiting cooperation with the limiting portion.

[0008] In summary, the utility model has the following beneficial effects: When using a pigging tool (or other cleaning equipment) to clean pipelines and valves, the limiting member is controlled by the adjusting member to extend into the valve cavity. At this time, during the initial movement of the pigging tool, the valve flap will be lifted, so that a limit fixation is formed between the valve flap and the limiting member. Therefore, during the repeated back-and-forth movement of the cleaning equipment, interference with the valve flap can be avoided, and the cleaning equipment can perform the cleaning operation stably. BRIEF DESCRIPTION OF THE DRAWINGS

[0009] Figure 1 Schematic three-dimensional structure diagram of the check valve;

[0010] Figure 2 Schematic diagram of the state where the valve flap is located at the first working position;

[0011] Figure 3 Schematic diagram of the state where the valve flap is located at the second working position and is limited;

[0012] Figure 4 For Figure 2 Enlarged schematic diagram at A;

[0013] Figure 5 Schematic diagram of the structures of the adjusting member and the limiting member.

[0014] Reference numerals: 1, valve body; 11, inlet; 12, valve cavity; 13, outlet; 14, threaded groove; 15, adjusting groove; 2, valve flap; 21, limiting portion; 3, first mounting surface; 4, second mounting surface; 5, limiting member; 51, moving seat; 511, limiting groove; 512, limiting spring; 52, moving tension spring; 53, limiting block; 54, linkage structure; 541, linkage groove; 542, linkage inclined surface; 6, adjusting member; 61, adjusting screw; 62, pushing block; 63, screw cap; 7, hinge shaft. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0015] The following further details the present utility model in conjunction with the drawings and embodiments. The same reference numerals are used for the same components. It should be noted that the terms "front", "rear", "left", "right", "upper" and "lower" used in the following description refer to the directions in the drawings, and the terms "bottom surface" and "top surface", "inner" and "outer" refer to the directions towards or away from the geometric center of a specific component, respectively.

[0016] Refer to Figures 1 to 5As shown in the figure, to achieve the above object, the present utility model provides the following technical solution: A check valve, comprising a valve body 1 and a valve flap 2. The valve body 1 is sequentially provided with an inlet 11, a valve chamber 12, and an outlet 13 along its conveying direction. A first mounting surface 3 and a second mounting surface 4 are provided inside the valve body 1. The first mounting surface 3 is located at the connection between the valve chamber 12 and the inlet 11, and the second mounting surface 4 is located at the connection between the valve chamber 12 and the outlet 13. The valve flap 2 is hinged on the first mounting surface 3. The valve flap 2 in the valve chamber 12 at least includes a first position for blocking the valve chamber 12 and a second position for completely conducting the valve chamber 12;

[0017] A limiting member 5 and an adjusting member 6 are provided at the second mounting surface 4. The adjusting member 6 is used to adjust the position of the limiting member 5. A limiting portion 21 is provided on the valve flap 2. The limiting member 5 is used to form a limiting fit with the limiting portion 21.

[0018] In the design of the present utility model, when a medium is introduced into the valve body 1, the valve flap 2 can move from the first position to the second position, thereby realizing the conduction of the valve chamber 12.

[0019] When using a pig (or other cleaning equipment) to clean the pipeline and valve, the adjusting member 6 is used to control the limiting member 5 to extend into the valve chamber 12. At this time, during the initial movement of the pig, the valve flap 2 will be lifted, so that a limiting fixation is formed between the valve flap 2 and the limiting member 5. Thus, during the repeated back-and-forth movement of the cleaning equipment, interference with the valve flap 2 can be avoided, and the cleaning equipment can stably perform the cleaning operation, improving the cleaning effect.

[0020] As Figure 2 and Figure 3 shown, the valve flap 2 is divided into a sealing seat and a limiting seat. The limiting portion 21 is provided on the limiting seat. The sealing seat is used to abut and seal with the first mounting surface 3. A limiting space is left between the limiting portion 21 and the sealing seat. When the valve flap 2 moves to the second position, the limiting member 5 can be inserted into the limiting space, thereby playing a limiting role.

[0021] Since the limiting seat is located above the sealing seat, when the cleaning device pushes the sealing seat to move, the limiting seat can be in limiting abutment with the limiting member.

[0022] A threaded groove 14 is provided on the valve body 1. The adjusting member 6 includes an adjusting screw 61, and the adjusting screw 61 is screwed into the threaded groove 14.

[0023] With this structural design, by rotating the adjusting screw 61, the adjusting screw 61 slides up and down in the threaded groove 14, thereby controlling the movement of the lower limiting member 5.

[0024] The valve body 1 is horizontally provided with an adjustment groove 15. The limiting member 5 includes a moving seat 51, a moving tension spring 52 and a limiting block 53. One end of the moving tension spring 52 is connected to the moving seat 51 and the other end is connected to the adjustment groove 15.

[0025] A linkage structure 54 linked to the adjustment screw 61 is provided at the upper end of the moving seat 51. When the adjustment screw 61 moves downward, the moving seat 51 is pushed to move out of the adjustment groove 15 through the linkage structure 54.

[0026] The linkage structure 54 includes a linkage groove 541 and a linkage inclined surface 542. A pushing block 62 cooperating with the linkage inclined surface 542 is provided at the lower end of the adjustment screw 61.

[0027] With this structure design, when the adjustment screw 61 moves downward, through the cooperation of the pushing block 62 and the linkage inclined surface 542, the moving seat 51 and the limiting block 53 move towards the first mounting surface 3, and the moving tension spring 52 is stretched.

[0028] When the adjustment screw 61 moves upward and resets, the moving seat 51 and the limiting block 53 retract into the adjustment groove 15 under the action of the moving tension spring 52.

[0029] Furthermore, a sealing sleeve is provided between the moving seat 51 and the adjustment groove 15 to prevent the medium in the valve cavity 12 from leaking.

[0030] Limiting embodiment one: It further includes a hinge shaft 7. The hinge shaft 7 is used to hinge the upper end of the limiting block 53 to the upper end of the moving seat 51.

[0031] As Figure 2 and Figure 3 shown, the limiting block 53 is hinged to one end of the moving seat 51 through the hinge shaft 7 and can only rotate upward. When the limiting member 5 extends out of the adjustment groove 15 under the action of the adjusting member 6, at this time the valve flap 2 rotates upward under the push of the cleaning device, so that the limiting portion 21 pushes the limiting block 53 to flip upward. When the limiting portion 21 moves downward, it will abut against the reset limiting block 53, thereby achieving the limiting operation.

[0032] When the limiting member 5 retracts into the adjustment groove 15, at this time the limiting block 53 is separated from the limiting portion 21, and the valve flap 2 resets under its own action.

[0033] Limiting embodiment two: A limiting groove 511 is provided in the moving seat 51. A limiting spring 512 is provided in the limiting groove 511. The moving seat 51 is slidably connected to the limiting groove 511 and is in contact with the limiting spring 512.

[0034] As Figure 5As shown, the limit block 53 is slidably connected to the limit groove 511 through the limit spring 512. The lower end of the limit block 53 is arranged in an arc shape, and the upper end of the limit block 53 is arranged in a flat shape.

[0035] When the limit member 5 extends out of the adjustment groove 15 under the action of the adjustment member 6, at this time, the valve flap 2 rotates upward under the push of the cleaning device, so that the limit portion 21 pushes the limit block 53 to move into the limit groove 511 and compresses the limit spring 512. When the limit portion 21 moves above the limit block 53, the limit block 53 resets under the action of the limit spring 512, so as to form a limit fit with the limit portion 21.

[0036] One of the above two embodiments is selected according to the valve size and the specific shape of the valve flap 2.

[0037] A screw cap 63 is arranged on the adjusting screw 61. The design of this screw cap 63 facilitates the operator to rotate the screw.

[0038] The above is only the preferred embodiment of the present invention. The protection scope of the present invention is not limited to the above embodiments. All technical solutions falling within the idea of the present invention belong to the protection scope of the present invention. It should be pointed out that for those of ordinary skill in the art, several improvements and refinements made without departing from the principle of the present invention should also be regarded as the protection scope of the present invention.

Claims

1. A check valve, comprising a valve body (1) and a valve flap (2), wherein the valve body (1) is provided with an inlet (11), a valve cavity (12), and an outlet (13) in sequence along its conveying direction, wherein: The valve body (1) is provided with a first mounting surface (3) and a second mounting surface (4); the first mounting surface (3) is located at a position where the valve cavity (12) and the inlet (11) are connected, and the second mounting surface (4) is located at a position where the valve cavity (12) and the outlet (13) are connected; the valve flap (2) is hingedly arranged on the first mounting surface (3); the valve flap (2) includes at least a first position for blocking the valve cavity (12) and a second position for completely conducting the valve cavity (12) in the valve cavity (12); A limiting member (5) and an adjusting member (6) are provided on the second mounting surface (4); the adjusting member (6) is used to adjust the position of the limiting member (5); a limiting portion (21) is provided on the valve flap (2); and the limiting member (5) is used to form a limiting fit with the limiting portion (21).

2. A check valve according to claim 1, characterized in that: The valve body (1) is provided with a thread groove (14), and the adjusting member (6) comprises an adjusting screw rod (61), and the adjusting screw rod (61) is screwed into the thread groove (14).

3. A check valve according to claim 2, characterized in that: The valve body (1) is laterally provided with an adjusting groove (15); the limiting member (5) comprises a movable seat (51), a movable tension spring (52) and a limiting block (53); one end of the movable tension spring (52) is connected to the movable seat (51) and the other end is connected to the adjusting groove (15); The upper end of the movable seat (51) is provided with a linkage structure (54) that is linked to the adjusting screw rod (61); when the adjusting screw rod (61) moves downward, the linkage structure (54) pushes the movable seat (51) to move out of the adjusting slot (15).

4. A check valve according to claim 3, characterized in that: The linkage structure (54) comprises a linkage groove (541) and a linkage inclined surface (542), and the lower end of the adjusting screw rod (61) is provided with a pushing block (62) matched with the linkage inclined surface (542).

5. A check valve according to claim 2, characterized in that: It also includes a hinge shaft (7), which is used to hinge the upper end of the limit block (53) with the upper end of the movable seat (51).

6. A check valve according to claim 3, characterized in that: A limiting groove (511) is arranged in the movable seat (51), a limiting spring (512) is arranged in the limiting groove (511), and the movable seat (51) is slidably connected to the limiting groove (511) and is arranged in contact with the limiting spring (512).

7. A check valve according to any one of claims 2 to 6, characterized in that: The adjusting screw rod (61) is provided with a screw cover (63).

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