Arrow-shaped check valve with spring anti-erosion protection structure

Abstract

The utility model discloses an arrow-shaped check valve with a spring anti-erosion protection structure, belongs to the technical field of check valves, and aims to solve the technical problem that a spring of an arrow-shaped check valve without an anti-erosion protection structure in the prior art is short in service life under the action of external erosion. A liquid flow channel is formed in the valve body, a sealing part is arranged in the liquid flow channel, and the sealing part is used for dividing the liquid flow channel into a sealing section and a circulation section. A supporting seat is arranged in the sealing section, an anti-erosion protection structure is arranged on the supporting seat, a spring is arranged in the anti-erosion protection structure, and the end, away from the anti-erosion protection structure, of the spring abuts against the sealing part and is used for providing shaft restoring force for the sealing part. According to the arrow-shaped check valve with the spring anti-erosion protection structure, the spring in the check valve can be effectively prevented from being in direct contact with liquid flow, and therefore the situation that the service life of the spring is affected due to the fact that the liquid flow erodes the spring is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to check valve technical field, concretely relates to a spring anti-erosion protection structure's arrow type check valve. BACKGROUND

[0002] Arrow check valve is also called arrow back pressure valve, and is short for arrow valve. It is one of the blowout preventers in the drilling tools in the oil drilling and well repairing.

[0003] Please refer to Figures 1 to 2 When the drilling fluid is normally circulated, the flowing drilling fluid pushes the sealing arrow to move and leave the back pressure valve seat against the spring force, at this time, the valve is in the open state, the liquid flow channel is smooth, at this time, the spring is in the compression state, and is directly subjected to the erosion of the drilling fluid and the mud, thereby reducing the service life of the spring. UTILITY MODEL CONTENT

[0004] The utility model discloses a spring anti-erosion protection structure's arrow type check valve to solve the technical problem that the service life of the arrow type check valve spring without the anti-erosion protection structure in the prior art is low under the external erosion.

[0005] To achieve the above object, the utility model provides the following technical scheme:

[0006] The utility model provides a spring anti-erosion protection structure's arrow type check valve, including: the valve body, the valve body is formed with liquid flow channel, be provided with sealing portion in the liquid flow channel, the sealing portion is used for separating the liquid flow channel into sealed section and flow section,

[0007] The sealed section is provided with the support seat, is provided with the anti-erosion protection structure on the support seat, is provided with the spring in the anti-erosion protection structure, the end of the spring away from the anti-erosion protection structure is with the sealing portion, and is used to provide the shaft recovery force to the sealing portion.

[0008] The utility model discloses a spring anti-erosion protection structure is arranged outside the spring, when the sealing portion is pushed up by the liquid flow, the sealing portion and the anti-erosion protection structure form the cladding space structure, thereby avoiding the direct erosion of the drilling fluid and the silt to the spring.

[0009] Optionally or preferably, the sealing portion includes a pressure cap, a back pressure valve seat and a sealing arrow.

[0010] The pressure cap is fixedly arranged in the liquid flow channel, the back pressure valve seat is arranged on one side of the pressure cap close to the sealing section, and the sealing arrow is movably connected with the pressure cap and the back pressure valve seat.

[0011] Optionally or preferably, one side of the pressure cap close to the flow passage section is further provided with a check ring.

[0012] Optionally or preferably, the sealing arrow comprises a head and a rod part; the head of the sealing arrow is arranged close to the sealing section and is in abutment with the spring.

[0013] Optionally or preferably, a first sealing member is arranged on the contact surface between the head of the sealing arrow and the back pressure valve seat.

[0014] Optionally or preferably, second and third sealing members are respectively arranged between the pressure cap and the valve body and between the back pressure valve seat and the valve body.

[0015] Based on the above technical solution, the utility model can at least produce the following technical effects:

[0016] The arrow check valve with the spring anti-erosion protection structure provided by the utility model has the advantages that the anti-erosion protection structure is arranged outside the spring, so that when the sealing arrow is pushed by the liquid flow, the head of the sealing arrow and the anti-erosion protection structure jointly form a covering space structure, the spring is covered in the covering space structure, the direct erosion of the drilling fluid and the silt on the spring is avoided, the spring is prevented from being damaged, and the service life of the spring is prolonged. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is a structural schematic view of the arrow check valve without the anti-erosion protection structure in the background art when the arrow check valve is closed;

[0018] Figure 2 is a structural schematic view of the arrow check valve without the anti-erosion protection structure in the background art when the arrow check valve is opened;

[0019] Figure 3 is a structural schematic view of the arrow check valve with the spring anti-erosion protection structure of the utility model when the arrow check valve is closed;

[0020] Figure 4 is a structural schematic view of the arrow check valve with the spring anti-erosion protection structure of the utility model when the arrow check valve is opened.

[0021] In the drawing: 1, valve body; 2, second sealing member; 3, third sealing member; 4, liquid flow channel; 41, sealing section; 42, flow passage section; 5, support seat; 6, spring; 7, anti-erosion protection structure; 8, pressure cap; 9, back pressure valve seat; 10, sealing arrow; 11, check ring; 12, first sealing member. DETAILED DESCRIPTION

[0022] Clearly, the described embodiments are merely a part of the embodiments of the present application, rather than all the embodiments, and all other embodiments obtained by a person of ordinary skill in the art without creative effort on the basis of the embodiments of the present application belong to the scope of protection of the present application.

[0023] Embodiment

[0024] Please refer to Figures 3 to 4 A spring erosion protection structure is arranged on the support seat 5, and the spring 6 is arranged in the erosion protection structure 7; when the valve body 1 is in an open state, the head of the sealing arrow 10 is moved forward under the pushing of the liquid flow, and finally the head of the sealing arrow 10 abuts against the erosion protection structure 7 and forms a covering space structure, so that the spring 6 is covered therein, and direct erosion of the liquid flow to the spring 6 is avoided.

[0025] The sealing part comprises a pressure cap 8, a back pressure valve seat 9 and a sealing arrow 10, wherein the pressure cap 8 is fixed in the liquid flow channel 4, the back pressure valve seat 9 is arranged on the side of the pressure cap 8 close to the sealing section 41, and the sealing arrow 10 is movably connected with the pressure cap 8 and the back pressure valve seat 9; the sealing arrow 10 has opposite head and rod parts, and the head part abuts against the spring 6.

[0026] It can be understood that when the valve body 1 is in an open state, the flowing drilling fluid pushes the sealing arrow 10 to move and leave the back pressure valve seat 9 by overcoming the spring force, and at this time, the spring 6 is in a compressed state; when the valve body 1 is in a closed state, the head of the sealing arrow 10 recontacts the back pressure valve seat 9.

[0027] In order to avoid direct contact and erosion of the spring 6 by the drilling fluid and the mud when the valve body 1 is in an open state, in the embodiment, the erosion protection structure 7 is arranged on the support seat 5, and the spring 6 is arranged in the erosion protection structure 7; when the valve body 1 is in an open state, the head of the sealing arrow 10 is moved forward under the pushing of the liquid flow, and finally the head of the sealing arrow 10 abuts against the erosion protection structure 7 and forms a covering space structure, so that the spring 6 is covered therein, and direct erosion of the liquid flow to the spring 6 is avoided.

[0028] Please refer to Figure 2 and Figure 4 In the figure, the thick solid line with an arrow indicates the direction of the liquid flow, Figure 2 In the figure, the thick solid line with an arrow indicates the direction of the liquid flow,

[0029] In order to improve the sealing effect between the components, in the embodiment, the pressure cap 8 is provided with a retaining ring 11 on the side close to the flow-through section 42, and the contact surface of the head of the sealing arrow 10 and the back pressure valve seat 9 is provided with a first sealing element 12, and the first sealing element 12 is an O-ring.

[0030] Furthermore, a second seal 2 and a third seal 3 are respectively arranged between the pressure cap 8 and the valve body 1 and between the back pressure valve seat 9 and the valve body 1.

[0031] Although the embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A spring-protected arrow check valve, characterized in that, The utility model relates to a valve body (1) is provided with liquid flow channel (4) in it, and the liquid flow channel (4) is provided with sealing part in it, and the sealing part is used for separating the liquid flow channel (4) into sealed section (41) and flow section (42). The sealed section (41) is provided with support seat (5), and the support seat (5) is provided with anti-erosion protection structure (7), and the anti-erosion protection structure (7) is provided with spring (6), and the end of spring (6) away from anti-erosion protection structure (7) is in abutment with sealing part and is used to provide shaft recovery force to sealing part. The sealing part includes pressure cap (8), back pressure valve seat (9) and sealing arrow (10).

2. The arrow check valve having a spring anti-erosion protection structure according to claim 1, characterized in that, The pressure cap (8) is fixedly arranged in the liquid flow channel (4), the back pressure valve seat (9) is arranged on the side of the pressure cap (8) close to the sealed section (41), and the sealing arrow (10) is movably connected with the pressure cap (8) and the back pressure valve seat (9). The side of the pressure cap (8) close to the flow section (42) is further provided with a retaining ring (11).

3. The arrow check valve having spring erosion protection structure according to claim 2, characterized in that, The sealing arrow (10) includes a head and a rod portion; the head of the sealing arrow (10) is arranged close to the sealed section (41) and is in abutment with the spring (6).

4. The arrow check valve with spring anti-erosion protection structure according to claim 2, characterized in that, The contact surface between the head of the sealing arrow (10) and the back pressure valve seat (9) is provided with a first sealing member (12).

5. The arrow check valve having spring erosion protection structure according to claim 4, wherein The second sealing member (2) and the third sealing member (3) are respectively arranged between the pressure cap (8) and the valve body (1) and between the back pressure valve seat (9) and the valve body (1).

6. The arrow check valve with spring anti-erosion protection structure according to claim 2, characterized in that, ​

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