Corrosion-resistant packing

Abstract

The utility model discloses a corrosion-resistant packing which comprises a main body, the main body comprises a packing layer, a silicon rubber core and an isolating membrane, the isolating membrane is coated outside the silicon rubber core, the packing layer is coated outside the isolating membrane, the corrosion-resistant packing further comprises a locking mechanism, and the locking mechanism comprises an inserting column, an inserting cylinder and a locking arm. The inserting column and the inserting cylinder are fixed to the silicon rubber cores at the two ends of the body respectively, the inserting column is in a step shape, the small-shaft-diameter end of the inserting column is provided with a locking arm, a check block is arranged in a cavity of the inserting cylinder, the end of the inserting column extends into the cavity of the inserting cylinder in the abutting process of the two ends of the body, and the large-shaft-diameter part of the inserting column is in clearance fit with the inserting cylinder. According to the scheme, the structure is improved, the locking mechanism is additionally arranged, the two ends of the main body are locked together through the butt joint of the inserting column and the inserting cylinder and the limitation of the locking arm and the check block, offset is reduced, and the sealing performance is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of sealing devices, in particular to a corrosion-resistant packing. Background Art

[0002] Packing is a commonly used shaft sealing material in the fields of petroleum, pumps, compressors, etc. Under some circumstances, the packing is usually pre-formed into a ring shape when used. For example, the inclined surfaces at both ends of the packing body are fitted and abutted to form a ring, which is then put on the surface of the shaft. When in use, the joints at both ends of the packing body are prone to large deviations, which in turn affects the sealing performance and needs to be improved. Utility Model Content

[0003] In order to solve at least one of the above technical defects, the utility model provides the following technical solutions:

[0004] The present application document discloses a corrosion-resistant packing, comprising a main body, wherein the main body comprises a packing layer, a silicone rubber core and an isolation membrane, wherein the isolation membrane is coated on the outside of the silicone rubber core and the packing layer is coated on the outside of the isolation membrane, and further comprises a locking mechanism, wherein the locking mechanism comprises a plug post, a plug sleeve and a locking arm, wherein the plug post and the plug sleeve are respectively fixed to the silicone rubber core at two ends of the main body, the plug post is stepped and a locking arm is arranged at the end with a small axial diameter, a stopper is arranged in the cavity of the plug sleeve, and during the abutment process of the two ends of the main body, the end of the plug post extends into the cavity of the plug sleeve, the part with a large axial diameter of the plug post cooperates with the gap of the plug sleeve, and the plug post is locked by the cooperation of the locking arm and the stopper.

[0005] In this solution, the structure is improved and a locking mechanism is added, so that the two ends of the main body are locked together by the docking of the plug post and the plug tube and the limitation of the locking arm and the stopper, which helps to reduce deviation and improve the sealing performance.

[0006] Furthermore, the locking arm is arranged at an angle and a limiting plate is arranged in front of the locking arm. Under normal conditions, the locking arm abuts against the limiting plate, thereby increasing the rotation of the locking arm by limiting the limiting plate and improving the locking strength.

[0007] Furthermore, a groove is provided at the end of the silicone rubber core, and the ends of the plug post and the plug barrel are fixed in the corresponding groove. Adding the groove facilitates docking with the plug post and the plug barrel.

[0008] Furthermore, the end surface of the main body is in a sloped shape.

[0009] Furthermore, the packing layer is coated with a polytetrafluoroethylene film layer to increase the polytetrafluoroethylene film layer.

[0010] Furthermore, a groove is provided at the end of the plug column with a smaller shaft diameter, and the tail end of the locking arm is located in the groove. Adding the groove facilitates the placement of the locking arm.

[0011] Furthermore, the end of the stopper is lower than the cavity wall of the first end of the insert tube, which is convenient for docking with the locking arm.

[0012] Compared with the prior art, the utility model has the following beneficial effects:

[0013] 1. The utility model adds a locking mechanism at the butt joint of the packing end, which helps to reduce deviation and improve the sealing effect. The addition of the PTFE film layer helps to improve corrosion resistance. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0015] Figure 1 It is a schematic diagram of the structure of both ends of the packing in Example 1;

[0016] Figure 2 is a schematic diagram of the structure of the locking mechanism;

[0017] Wherein, the accompanying drawings are marked as follows:

[0018] 1. Silicone rubber core; 2. Isolation membrane; 3. Packing layer; 4. PTFE membrane layer; 5. Locking mechanism; 50. Insert column; 51. Insert cylinder; 52. Locking arm; 53. Limiting plate; 54. Stopper; 55. Groove. DETAILED DESCRIPTION

[0019] The utility model is further described below in conjunction with the accompanying drawings and specific embodiments.

[0020] Example 1

[0021] like Figure 1 , Figure 2 As shown, in this example, the corrosion-resistant packing includes a main body, and the front and rear ends of the main body are beveled and butted together to make the main body annular. Specifically, the main body includes a packing layer 3, a silicone rubber core 1 and an isolation membrane 2, wherein the isolation membrane 2 is coated on the outside of the silicone rubber core 1 and the packing layer 3 is coated on the outside of the isolation membrane 2. The isolation membrane 2 is such as a PFTE membrane. The hierarchical structure of the silicone rubber core 1, the isolation membrane 2 and the packing layer 3 can be specifically referred to the patent document with the authorization announcement number CN106594281 B. This scheme is further developed on this basis, wherein the isolation membrane is used to protect the silicone rubber core from corrosion such as engine oil and improve corrosion resistance.

[0022] In this example, a locking mechanism 5 is added, which includes a plug post 50, a plug sleeve 51, and a locking arm 52. Grooves are formed on the silicone rubber core 1 at the head and tail ends of the main body. The tail end of the plug post 50 is inserted into the groove and fixed, such as by hot melting, gluing, etc. The tail end of the plug sleeve 51 with a small axial diameter is also inserted into the groove of the silicone rubber core 1 at the corresponding end and fixed.

[0023] The plug 50 is a stepped shaft type. Figure 1 In the state shown, the right part of the plug post 50 protrudes out of the end of the main body, and the insert sleeve 51 is located inside the end of the column. The outer diameter of the insert sleeve 51 is consistent with the outer diameter of the silicone rubber core 1, and the outside of the insert sleeve 51 is also covered with an isolation membrane 2.

[0024] The inner diameter of the front end of the insert cylinder 51 is smaller than the inner diameter of its rear end. A stopper 54 is formed in the cavity behind the front end of the insert cylinder 51, and the bottom end of the stopper 54 is lower than the cavity wall of the front end of the insert cylinder 51, that is, the distance between the bottom end of the stopper 54 and the axial center line is smaller than the distance between the cavity wall of the front end of the insert cylinder 51 and the axial center line. A groove 55 is formed at the end of the small axial diameter of the plug column 50, and an arm rod is formed on the groove cavity wall. The end of the arm rod extends out from the groove cavity at an angle, and the arm rod is the locking arm 52.

[0025] During the docking process of the two ends of the main body, the end of the plug post 50 extends into the cavity of the insert tube 51 until the block 54 abuts the locking arm 52. During the continued docking process, the block 54 presses down the locking arm 52. After the locking arm 52 passes the block 54, the locking arm 52 returns to abut the back of the block, and the axial separation of the plug post 50 and the insert tube 51 is limited. When the locking arm 52 moves to the back of the block 54, the larger axial diameter portion of the plug post 50 is inserted into the cavity at the head end of the insert tube 51 and the gap between the two is matched. Under this configuration, the radial displacement of the plug post and the insert tube is limited, and the offset of the two ends of the main body is limited under this structure, which helps to improve the sealing performance.

[0026] In addition, a limiting plate 53 may be formed in front of the locking arm 52, such as Figure 2 As shown, the limiting plate 53 is L-shaped, the longitudinal end of the limiting plate 53 is connected to the end of the plug post 50, and the transverse end of the limiting plate 53 abuts against the locking arm 52 to limit its rotation. Figure 1 , Figure 2 As shown, in a normal state, the locking arm 52 abuts against the limiting plate 53, and the axial separation of the plug column and the plug tube is further limited under this structure.

[0027] In addition, the packing layer 3 may be coated with a polytetrafluoroethylene film layer 4 to further improve the corrosion resistance.

[0028] The above are only preferred implementations of the utility model. The protection scope of the utility model is not limited to the above embodiments. All technical solutions under the idea of ​​the utility model belong to the protection scope of the utility model. It should be pointed out that for ordinary technicians in this technical field, some improvements and modifications without departing from the principle of the utility model should also be regarded as the protection scope of the utility model.

Claims

1. A corrosion-resistant packing, comprising a main body, wherein the main body comprises a packing layer, a silicone rubber core and an isolation membrane, wherein the isolation membrane is coated on the outside of the silicone rubber core and the packing layer is coated on the outside of the isolation membrane, characterized in that: It also includes a locking mechanism, which includes a plug post, a sleeve, and a locking arm. The plug post and the sleeve are respectively fixed to the silicone rubber core at the two ends of the main body. The plug post is stepped and a locking arm is arranged at the end with a small axial diameter. A stopper is arranged in the cavity of the sleeve. During the abutment process of the two ends of the main body, the end of the plug post extends into the sleeve cavity, the part with a large axial diameter of the plug post cooperates with the sleeve clearance, and the plug post is locked by the cooperation of the locking arm and the stopper.

2. The corrosion-resistant packing according to claim 1, characterized in that: The locking arm is arranged obliquely and a limiting plate is arranged in front of the locking arm. In a normal state, the locking arm abuts against the limiting plate.

3. The corrosion-resistant packing according to claim 1, characterized in that: A groove is arranged at the end of the silicone rubber core, and the ends of the plug column and the plug tube are fixed in the corresponding groove.

4. The corrosion-resistant packing according to claim 1, characterized in that: The end surface of the main body is in a slope shape.

5. The corrosion-resistant packing according to claim 1, characterized in that: The packing layer is coated with a polyfluoro film layer.

6. The corrosion-resistant packing according to claim 1, characterized in that: A groove is arranged at the end of the plug column with a small shaft diameter, and the tail end of the locking arm is located in the groove.

7. The corrosion-resistant packing according to claim 1, characterized in that: The end of the stopper is lower than the cavity wall of the first end of the insert sleeve.

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