Valve thread rust-proof structure

Abstract

The utility model relates to the field of internal thread ball valves, and discloses a valve thread rust-proof structure which is arranged at the joint of a ball valve body and a pipeline and located at the two ends of the ball valve body, internal thread parts are arranged at the two ends of the ball valve body, and an external thread part is arranged at the end, making contact with the ball valve body, of the pipeline. The ball valve body is provided with an internal thread part and an external thread part, the internal thread part is in threaded fit with the external thread part, check rings are arranged at the two ends of the ball valve body and located on the outermost sides of the two ends of the ball valve body, a packing groove used for containing and limiting the sealing part is formed between the check rings and a pipeline, and the packing groove is filled with the sealing part. The space is reserved in the threaded connection position of the ball valve and the pipeline and filled with the sealing piece, so that the threaded connection position of the ball valve and the pipeline is prevented from making contact with the outside, the effect of preventing the threads from rusting is achieved, and the ball valve has the advantages of being simple in structure, good in sealing performance, easy and convenient to install and the like.

Description

Technical Field

[0001] The utility model relates to the technical field of internal thread ball valves, in particular to a valve thread anti-rust structure. Background Art

[0002] Ball valves are mainly used to cut off, distribute and change the flow direction of the medium in the pipeline. Because they can be closed tightly by just rotating 90 degrees and with very small torque, ball valves are most suitable for use as switches and cut-off valves. Ball valves are widely used in oil refining, long-distance pipelines, chemicals, papermaking, pharmaceuticals, water conservancy, electricity, municipal administration, steel and other industries, and they play an important role in the national economy.

[0003] Both ends of the valve body of the internal thread ball valve are made with internal threads for connecting to other pipes, and both ends of the pipe are made with external threads. The connection and assembly between the ball valve and the pipe can be achieved through the matching of threads.

[0004] When the internal thread ball valve is actually installed and used, there is no effective anti-rust measure at the thread of the ball valve and the pipeline. Long-term exposure to the environment where the valve is located can easily cause the threaded connection between the ball valve and the pipeline to rust, especially the exposed threaded part of the pipeline that is not connected to the ball valve thread is more likely to accumulate water and rust. Once the thread is rusted, it will directly lead to the difficulty of disassembling and separating the valve and the pipeline during subsequent maintenance and replacement, which will greatly delay the progress of maintenance, and violent twisting by on-site workers can easily damage the valve or pipeline. Therefore, it is necessary to design an anti-rust structure for the threaded connection between the internal thread ball valve and the pipeline. Utility Model Content

[0005] In view of the problems existing in the prior art: the threaded connection between the ball valve and the pipeline and the exposed threaded part of the pipeline that is not threadedly connected to the ball valve are prone to rust. The purpose of the utility model is to provide a valve thread rust prevention structure, which reserves space at the threaded connection between the ball valve and the pipeline and fills the reserved space with a seal, thereby blocking the contact between the threaded connection between the ball valve and the pipeline and the outside world, so as to prevent the threads from rusting. It has the advantages of simple structure, good sealing, easy installation, etc., and is convenient for large-scale promotion and application.

[0006] In order to achieve the above object, the technical solution of the utility model is:

[0007] A valve thread rust prevention structure is arranged at the connection between a ball valve body and a pipeline and is located at both ends of the ball valve body. Both ends of the ball valve body are provided with internal threaded parts, and the end of the pipeline that contacts the ball valve body is provided with an external threaded part, and the internal threaded part is threadedly matched with the external threaded part. It also includes a sealing member. Both ends of the ball valve body are provided with retaining rings and the retaining rings are located at the outermost sides of the two ends of the ball valve body. A stuffing groove for accommodating and limiting the sealing member is formed between the retaining ring and the pipeline, and the sealing member fills the stuffing groove.

[0008] The utility model is further configured as follows: the length of the retaining ring in the axial direction of the ball valve body is greater than the length of the external threaded portion that is not screwed into the internal threaded portion.

[0009] The utility model is further configured as follows: the cross-sectional shape of the filling groove in the pipeline axial direction is a right-angle trapezoid, and the shape and size of the sealing element are both adapted to the filling groove.

[0010] The utility model is further configured as follows: the sealing member comprises a filling portion and a sealing portion which are integrally arranged; the shape and size of the filling portion are both adapted to the filling groove; and the sealing portion is in close contact with the retaining ring.

[0011] The utility model is further configured as follows: the diameter of the sealing portion is equal to the diameter of the ball valve body.

[0012] The utility model is further configured as follows: the sealing member further comprises a supporting portion, the supporting portion is located at a side of the sealing portion away from the filling portion, and the cross-sectional shape of the supporting portion in the pipeline axis direction is a right triangle.

[0013] The utility model is further configured as follows: the support portion is integrally configured with the filling portion and the sealing portion.

[0014] The utility model is further configured as follows: it also includes a retaining spring for limiting the sealing member, and the retaining spring is located at a side of the sealing portion away from the filling portion.

[0015] The utility model is further configured as follows: the sealing element is made of a flexible material.

[0016] The utility model is further configured that: the sealing element is made of rubber material.

[0017] In summary, the beneficial effects achieved by the present invention are as follows:

[0018] (1) The length of the retaining rings arranged on the outermost sides of the ball valve body in the axial direction of the ball valve body is greater than the length of the portion of the external thread that is not screwed into the internal thread (i.e., the exposed thread). The retaining rings themselves can play a certain role in shielding the exposed thread, preventing water droplets and foreign matter from entering the threaded connection between the pipeline and the ball valve body;

[0019] (2) When the pipe and the ball valve body are threadedly connected, the stuffing groove formed between the retaining ring and the pipe can accommodate and limit the seal. After the seal fills the stuffing groove, the threaded connection between the pipe and the ball valve body and the exposed threaded part are isolated from the outside world, thereby preventing the threaded part from rusting;

[0020] (3) In addition to the filling part that matches the packing groove, the seal is also provided with a sealing part that is in close contact with the retaining ring. The sealing part and the retaining ring further enhance the sealing effect on the threaded connection between the pipeline and the ball valve body, thereby improving the anti-rust ability;

[0021] (4) In order to prevent the filling part on the seal from falling out of the filling groove and ensure that the seal is in close contact with the retaining ring, a support part or a retaining spring is provided on the side of the seal away from the filling part. The corresponding fastening method can be selected according to actual needs;

[0022] (5) During the disassembly and assembly process of the pipeline and the ball valve body, the integrally arranged seal is convenient for workers to put it on the pipeline and install it at the threaded connection between the pipeline and the ball valve body; at the same time, the seal can also be taken out at one time during disassembly, which is conducive to improving the on-site disassembly and assembly efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the specification will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0024] Figure 1 It is a cross-sectional structural diagram of the ball valve body and the pipeline in the utility model;

[0025] Figure 2 It is a cross-sectional view of the pipeline and the ball valve body in the present utility model in the threaded matching state;

[0026] Figure 3 This is a schematic diagram of the structure of the sealing member in the first embodiment of the utility model;

[0027] Figure 4 This is a cross-sectional view of the sealing member installed in the packing groove in the first embodiment of the utility model;

[0028] Figure 5 This is a schematic diagram of the structure of the sealing member in the second embodiment of the present utility model;

[0029] Figure 6 This is a cross-sectional view of the sealing member installed in the packing groove in the second embodiment of the present utility model;

[0030] Figure 7 This is a schematic diagram of the structure of the sealing member in the third embodiment of the present utility model;

[0031] Figure 8 This is a schematic diagram of the structure of the sealing member installed on the pipeline in the third embodiment of the utility model;

[0032] Fig. 9This is a cross-sectional view of the sealing member in the third embodiment of the present invention when installed in the stuffing groove.

[0033] In the figure: 1. ball valve body; 11. internal threaded portion; 12. stuffing groove; 13. retaining ring; 2. pipe; 21. external threaded portion; 3. sealing member; 31. filling portion; 32. sealing portion; 33. supporting portion; 4. retaining ring. DETAILED DESCRIPTION

[0034] The technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. For ease of explanation, the terms "vertical", "horizontal", "left", "right", "upper", "lower", "inner", "outer", "bottom", etc. used in this specification indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific position, be constructed and operated in a specific position, and therefore cannot be understood as a limitation on the present application.

[0035] It should be noted that the embodiments of the present invention and the features involved in the embodiments can be combined with each other without conflict. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0036] Embodiment 1

[0037] As attached Figure 1 and attached Figure 2 As shown, a valve thread anti-rust structure is arranged at the connection between the ball valve body 1 and the pipeline 2 and is located at both ends of the ball valve body 1.

[0038] The ball valve body 1 is cylindrical in shape, and its axial direction is its length direction. A handle for turning the ball valve is arranged on the top of the ball valve body 1 , and internal threaded parts 11 are arranged at both ends of the ball valve body 1 , and the internal threaded parts 11 are located on the inner wall of the ball valve body 1 .

[0039] Both ends of the ball valve body 1 are provided with retaining rings 13 and the retaining rings 13 are located at the outermost sides of the two ends of the ball valve body 1. The retaining ring 13 is annular and is integrally provided with the ball valve body 1, and the outer diameter of the retaining ring 13 is consistent with the outer diameter of the ball valve body 1.

[0040] The pipe 2 is a cylindrical tubular structure, and an external threaded portion 21 is provided on the outer wall of the end portion contacting the ball valve body 1. The external threaded portion 21 and the internal threaded portion 11 are threadedly matched to realize the connection between the pipe 2 and the ball valve body 1.

[0041] When the pipe 2 is connected to the ball valve body 1, an annular packing groove 12 is formed between the retaining ring 13 and the pipe 2. Since the inner wall of the retaining ring 13 is inclined, the cross-sectional shape of the packing groove 12 in the axial direction of the pipe 2 is a right-angle trapezoid. The portion of the external thread 21 that is not screwed into the internal thread 11, that is, the length of the exposed thread is less than the length of the retaining ring 13 in the axial direction of the ball valve body 1, so that the retaining ring 13 can play a certain shielding role on the exposed thread, preventing water droplets and foreign matter from entering the threaded connection between the pipe 2 and the ball valve body 1.

[0042] As attached Figure 3 and attached Figure 4 As shown, the valve thread anti-rust structure in the utility model also includes a sealing member 3.

[0043] The sealing member 3 is an annular structure and is made of a flexible material with a certain elasticity. In this embodiment, the sealing member 3 is made of rubber material.

[0044] The packing groove 12 is used to accommodate the seal 3, so the shape and size of the seal 3 are adapted to the packing groove 12. After the seal 3 fills the packing groove 12, the packing groove 12 also has a certain limiting effect on the seal 3 to prevent the seal 3 from coming out of the packing groove 12.

[0045] The implementation principle of the above embodiment is:

[0046] Before connecting the pipe 2 with the ball valve body 1, the seal 3 is first sleeved on the pipe 2 from the end where the external threaded portion 21 is located, and then the threaded connection between the external threaded portion 21 and the internal threaded portion 11 is completed, and the seal 3 is pressed into the packing groove 12, so that the seal 3 isolates the threaded connection between the pipe 2 and the ball valve body 1 and the exposed threaded portion from the outside world, thereby preventing the threaded portion from rusting.

[0047] Embodiment 2

[0048] As attached Figure 5 and attached Figure 6 As shown, a valve thread rust prevention structure disclosed in the utility model is shown. Different from the first embodiment, the sealing member 3 includes a filling portion 31, a sealing portion 32 and a supporting portion 33 which are integrally arranged.

[0049] In this embodiment, only the filling portion 31 on the sealing member 3 has a shape and a size that matches the filling groove 12 .

[0050] The sealing portion 32 is in the shape of a circular ring as a whole, and the outermost diameter of the sealing portion 32 is equal to the diameter of the ball valve body 1, so that the outer side wall of the sealing portion 32 is flush with the outer side wall of the ball valve body 1, and the bottom surface of the sealing portion 32 close to the ball valve body 1 is tightly attached to the retaining ring 13. The fit between the sealing portion 32 and the retaining ring 13 further improves the sealing effect of the sealing member 3.

[0051] The support portion 33 is a conical annular structure, which is located on the side of the sealing portion 32 away from the filling portion 31, and the cross-sectional shape of the support portion 33 in the axial direction of the pipe 2 is a right triangle. The arrangement of the support portion 33 can effectively prevent the filling portion 31 on the sealing member 3 from escaping from the packing groove 12, while ensuring that the sealing portion 32 is in close contact with the retaining ring 13.

[0052] The implementation principle of the above embodiment is:

[0053] Before connecting the pipe 2 with the ball valve body 1, since the filling part 31, the sealing part 32 and the supporting part 33 of the sealing member 3 are integrally arranged, the worker can put the sealing member 3 on the pipe 2 from the end where the external threaded part 21 is located in one operation, and then complete the threaded connection between the external threaded part 21 and the internal threaded part 11, and press the sealing member 3 into the filling groove 12. At this time, the filling part 31 fills the filling groove 12, the sealing part 32 is tightly attached to the retaining ring 13, and the supporting part 33 plays the role of limiting the axial displacement of the filling part 31 and the sealing part 32, so that the sealing member 3 isolates the threaded connection between the pipe 2 and the ball valve body 1 and the exposed threaded part from the outside world, so as to prevent the threaded part from rusting.

[0054] Embodiment 3

[0055] As attached Figure 7 , Attachment Figure 8 and attached Fig. 9 As shown, a valve thread rust prevention structure disclosed in the utility model is shown. Different from the second embodiment, the seal 3 only includes a filling part 31 and a sealing part 32 which are integrally arranged, and the valve thread rust prevention structure in this embodiment also includes a retaining spring 4 for limiting the seal 3.

[0056] The circlip is also called a retaining ring, which belongs to a kind of fastener in the prior art and has the effect of preventing the axial movement of parts on the shaft or the hole. The circlip in the present embodiment is a circlip for the shaft, and special circlip pliers are used when disassembling the circlip.

[0057] The clamping spring 4 is located on the side of the sealing portion 32 away from the filling portion 31, and is used to replace the supporting portion 33 in the second embodiment. Since the clamping spring 4 has a stronger axial limiting effect on the filling portion 31 and the sealing portion 32, this arrangement is suitable for environments with high requirements for rust protection.

[0058] The implementation principle of the above embodiment is:

[0059] Before connecting the pipe 2 and the ball valve body 1, first install the clamp 4 on the pipe 2, then put the seal 3 on the pipe 2 from the end where the external threaded portion 21 is located, and then complete the threaded connection between the external threaded portion 21 and the internal threaded portion 11. At this time, the axial position of the clamp 4 can be further adjusted so that the filling portion 31 fills the filling groove 12 and the sealing portion 32 is tightly attached to the retaining ring 13, ensuring the sealing effect of the seal 3 on the threaded connection between the pipe 2 and the ball valve body 1 and the exposed threaded portion.

[0060] Although preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. Obviously, those skilled in the art may make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

Claims

1. A valve thread rust prevention structure, arranged at the connection between a ball valve body (1) and a pipe (2) and located at both ends of the ball valve body (1), both ends of the ball valve body (1) are provided with internal threaded parts (11), and the end of the pipe (2) in contact with the ball valve body (1) is provided with an external threaded part (21), the internal threaded part (11) and the external threaded part (21) are threadedly matched, characterized in that: The ball valve further comprises a sealing member (3), wherein both ends of the ball valve body (1) are provided with retaining rings (13), and the retaining rings (13) are located at the outermost sides of both ends of the ball valve body (1), and a filling groove (12) for accommodating and limiting the sealing member (3) is formed between the retaining ring (13) and the pipeline (2), and the sealing member (3) fills the filling groove (12).

2. The valve thread anti-rust structure according to claim 1, characterized in that: The length of the retaining ring (13) in the axial direction of the ball valve body (1) is greater than the length of the external threaded portion (21) that is not screwed into the internal threaded portion (11).

3. The valve thread anti-rust structure according to claim 1, characterized in that: The cross-sectional shape of the filling groove (12) in the axial direction of the pipeline (2) is a right-angled trapezoid, and the shape and size of the sealing element (3) are compatible with the filling groove (12).

4. The valve thread anti-rust structure according to any one of claims 1 to 3, characterized in that: The sealing member (3) comprises a filling portion (31) and a sealing portion (32) which are integrally arranged; the shape and size of the filling portion (31) are adapted to the filling groove (12); and the sealing portion (32) is in close contact with the retaining ring (13).

5. The valve thread anti-rust structure according to claim 4, characterized in that: The diameter of the sealing portion (32) is equal to the diameter of the ball valve body (1).

6. The valve thread anti-rust structure according to claim 4, characterized in that: The sealing member (3) further comprises a supporting portion (33), wherein the supporting portion (33) is located on a side of the sealing portion (32) away from the filling portion (31), and the cross-sectional shape of the supporting portion (33) in the axial direction of the pipeline (2) is a right triangle.

7. The valve thread anti-rust structure according to claim 6, characterized in that: The supporting portion (33) is integrally arranged with the filling portion (31) and the sealing portion (32).

8. The valve thread anti-rust structure according to claim 4, characterized in that: It also includes a retaining spring (4) for limiting the position of the sealing member (3), and the retaining spring (4) is located on a side of the sealing portion (32) facing away from the filling portion (31).

9. The valve thread anti-rust structure according to claim 1, characterized in that: The sealing element (3) is made of flexible material.

10. The valve thread anti-rust structure according to claim 9, characterized in that: The sealing element (3) is made of rubber material.

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