Metal step type tetrafluoroethylene bushing pressing gasket and cable lead-in device

Abstract

The utility model provides a metal step type tetrafluoroethylene bushing compression gasket and a cable lead-in device, and the gasket comprises a metal gasket which comprises a gasket main body and a first step disposed at one end of the outer wall of the gasket main body; the L-shaped bush is provided with a bush body arranged on the outer wall of the gasket body in a pressing and sleeving mode and a flange arranged at one end of the bush body and abutting against the first step. According to the pressing gasket, on one hand, the hardness can be guaranteed due to the fact that the metal gasket is adopted, on the other hand, the lining body can play a role in positioning the metal gasket, the outer wall of the metal gasket cannot make contact with the inner wall of the pressing nut or the inner wall of the connector body, and the L-shaped lining is made of tetrafluoroethylene, so that the service life of the pressing gasket is prolonged. Friction force and torsion force between the L-shaped lining made of tetrafluoroethylene and the first compression nut are small, so that more labor is saved when the compression nuts are screwed, it is guaranteed that the sealing ring and the cable cannot rotate together with the compression nuts, and therefore one-time installation is convenient, labor is saved, sealing performance is good, and the standard requirements for dust prevention, water prevention and explosion prevention are met.

Description

Technical Field

[0001] This utility model relates to the field of distribution box technology, specifically to a metal stepped PTFE bushing compression gasket and cable entry device. Background Technology

[0002] The electrical box includes a box body, control electrical components, and incoming and outgoing cables. The incoming and outgoing cables are fixed to the box body via an entry device, with one end connected to the control electrical components. The entry device includes a connector body and a clamping nut. The connector body has a first threaded section with an external thread that connects to the internal thread of the clamping nut. A sealing ring and a clamping washer are installed inside the clamping nut. The clamping washer is installed on the side of the sealing ring away from the first threaded section and abuts against the step of the clamping nut. After the cable is inserted into the connector body, the clamping nut needs to be tightened. During tightening, the friction between the clamping nut and the clamping washer increases, making installation more difficult. Furthermore, if the friction is too high, the clamping washer will rotate with the clamping nut, causing the cable to rotate as well. This can loosen or detach the installed cable end, affecting normal power supply and potentially leading to an accident. Utility Model Content

[0003] Therefore, the technical problem to be solved by this utility model is to overcome the defects of the existing technology, such as the difficulty in tightening the clamping nut and the impact on the use of the cable, so as to provide a metal stepped PTFE bushing clamping gasket and cable introduction device that is easy to install at one time and saves effort, and ensures normal power supply of the cable.

[0004] Therefore, this utility model provides a metal stepped PTFE bushing compression gasket, including a metal gasket and an L-shaped bushing. The metal gasket includes a gasket body and a first step disposed at one end of the outer wall of the gasket body. The L-shaped bushing has a bushing body that is compressed and sleeved on the outer wall of the gasket body, and a flange disposed at one end of the bushing body and abutting against the first step.

[0005] The other end of the outer wall of the gasket body is provided with a second step, which is used to abut against the end of the bushing body away from the flange.

[0006] The L-shaped bushing has a first chamfer at its perforation.

[0007] The outer end face of the second step is provided with a second chamfer.

[0008] This utility model also provides a cable entry device, comprising: a first connector body having a first threaded section, the first threaded section having an external thread; a first clamping nut threadedly connected to the first threaded section, the end of the first clamping nut away from the first connector body having an inner flange; a first sealing ring installed inside the first clamping nut, one end of the first sealing ring abutting against the end of the first threaded section; and a metal stepped PTFE bushing clamping gasket as described above, the metal gasket abutting against the first sealing ring, and the flange abutting against the inner flange.

[0009] It also includes a spacer sleeve that is pressed and fitted onto the first sealing ring, and there is a gap between the outer wall of the spacer sleeve and the inner wall of the first pressing nut.

[0010] The first connector body has a third step on its outer wall that abuts against the inner wall of the box, and a third threaded section on the third step away from the first threaded section. A sealing nut is provided on the third threaded section, and a PTFE gasket is provided on the sealing nut and the third step.

[0011] This utility model also provides a cable introduction device, comprising: a second connector body having a second threaded section and a tapered surface disposed adjacent to the second threaded section, the second threaded section having an internal thread; a threaded connector having a third threaded section threadedly connected to the second threaded section; a tapered second sealing ring installed in the second connector body, one end of which abuts against the tapered surface; and a metal stepped PTFE bushing compression gasket as described above, the metal gasket abutting against the end of the second sealing ring away from the tapered surface, the flange abutting against the end of the third threaded section.

[0012] The technical solution of this utility model has the following advantages:

[0013] 1. The clamping gasket provided by this utility model includes a metal gasket and an L-shaped bushing. The metal gasket includes a gasket body and a first step disposed at one end of the outer wall of the gasket body. The bushing has a bushing body sleeved on the outer wall of the gasket body and a flange disposed at one end of the bushing body and abutting against the first step. The clamping gasket can ensure hardness due to the use of a metal gasket. On the other hand, the bushing body can position the metal gasket, preventing the outer wall of the metal gasket from contacting the inner wall of the clamping nut or connector body. The L-shaped bushing is made of polytetrafluoroethylene (PTFE). The PTFE L-shaped bushing has low friction and low torque with the first clamping nut, making it easier to tighten the clamping nut. This ensures that the sealing ring and cable will not rotate with the clamping nut, thus achieving convenient and labor-saving one-time installation, good sealing performance, and meeting the requirements of dustproof, waterproof and explosion-proof standards.

[0014] 2. The compression gasket provided by this utility model has a second step at the other end of the outer wall of the gasket body. The second step is used to abut against the end of the bushing body away from the flange. The L-shaped bushing has a first chamfer, and the metal gasket has a second chamfer. The L-shaped bushing material of PTFE is elastic, which makes it easier for the two to assemble. In addition, due to the restriction of the first step and the second step, the L-shaped bushing will not separate from the metal gasket. Therefore, the metal gasket and the L-shaped bushing are assembled together first during use, which makes subsequent assembly more convenient.

[0015] 3. The cable entry device provided by this utility model includes a first connector body, a first clamping nut, a first sealing ring, and a clamping gasket. The flange of the L-shaped bushing abuts against the inner flange of the clamping nut. The material of the L-shaped bushing is PTFE. The friction and torque between the PTFE L-shaped bushing and the first clamping nut are small, which makes it easier to tighten the clamping nut and ensures that the sealing ring and the cable will not rotate with the clamping nut. This achieves convenient and labor-saving one-time installation, good sealing performance, and meets the requirements of dustproof, waterproof and explosion-proof standards. Attached Figure Description

[0016] To more clearly illustrate the specific embodiments of this utility model or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of the metal stepped PTFE bushing compression gasket of this utility model.

[0018] Figure 2 This is a schematic diagram showing the disassembled structure of the metal gasket and bushing;

[0019] Figure 3 A schematic diagram of the cable entry device and a first embodiment (using cable wiring);

[0020] Figure 4 A schematic diagram of the first embodiment of the cable entry device connected to (flexible conduit);

[0021] Figure 5 A schematic diagram of the cable entry device and a second embodiment (using cable wiring);

[0022] Figure 6 A schematic diagram of the second embodiment of the cable entry device connected to (flexible conduit);

[0023] Figure 7 This is a schematic diagram of the structure of the first sealing ring.

[0024] Explanation of reference numerals in the attached drawings: 1. Metal gasket; 2. Gasket body; 3. First step; 4. L-shaped bushing; 5. Bushing body; 6. Flange; 7. Second step; 8. First connector body; 9. First threaded section; 10. First compression nut; 11. Inner flange; 12. First sealing ring; 13. Spacer; 14. Second connector body; 15. Second threaded section; 16. Tapered surface; 17. Threaded connector; 18. Third threaded section; 19. Second sealing ring; 20. Third step; 21. PTFE gasket; 22. Sealing nut; 23. Third threaded section; 24. First chamfer; 25. Second chamfer. Detailed Implementation

[0025] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0026] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and 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, and therefore should not be construed as a limitation of this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0027] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; 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; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0028] Furthermore, the technical features involved in the different embodiments of this utility model described below can be combined with each other as long as they do not conflict with each other.

[0029] Example 1

[0030] This embodiment provides a cable entry device, such as... Figure 3 and Figure 4As shown, it includes a first connector body 8, a first clamping nut 10, a first sealing ring 12, a metal stepped PTFE bushing clamping gasket, and a spacer 13.

[0031] The first connector body 8 has a first threaded section 9, which has an external thread.

[0032] The first clamping nut 10 is threadedly connected to the first threaded section 9, and the end of the first clamping nut 10 away from the first connector body 8 is provided with an inner flange 11.

[0033] The first sealing ring 12 is installed inside the first clamping nut 10, and one end of the first sealing ring 12 abuts against the end of the first threaded section 9. In this embodiment, as shown... Figure 7 As shown, the first sealing ring 12 is a double-flare type sealing ring. The clamping range of the double-flare type can be uniformly clamped from small to large. The material of the first sealing ring 12 is EPDM.

[0034] Metal stepped PTFE bushing compression gasket, such as Figure 1 and Figure 2 As shown, the device includes a metal gasket 1 and an L-shaped bushing 4. The metal gasket 1 includes a gasket body 2, and a first step 3 and a second step 7 located at both ends of the outer wall of the gasket body 2. The metal gasket 1 abuts against the first sealing ring 12. The L-shaped bushing 4 has a bushing body 5 that is pressed and fitted onto the outer wall of the gasket body 2, and a flange 6 located at one end of the bushing body 5 that abuts against the first step 3. The flange 6 abuts against the inner flange 11. The second step 7 abuts against the end of the bushing body 5 away from the flange 6. The L-shaped bushing 4 has a first chamfer 24 located at its through-hole, and a second chamfer 25 located on the outer end face of the second step 7. The first chamfer 24 and the second chamfer 25 facilitate the assembly of the L-shaped bushing 4 and the metal gasket 1. In this embodiment, the L-shaped bushing 4 is made of polytetrafluoroethylene (PTFE). The friction and torque between the PTFE L-shaped bushing 4 and the first clamping nut 10 are small, thereby reducing the friction between the clamping gasket and the inner wall of the first clamping nut 10. This ensures that the sealing ring and the cable will not rotate together with the clamping nut, thus achieving convenient and labor-saving one-time installation, and making it safer and more reliable.

[0035] A spacer 13 is pressed and fitted onto the first sealing ring 12, and a gap is provided between the outer wall of the spacer 13 and the inner wall of the first clamping nut 10. In this embodiment, the material of the spacer 13 is polypropylene.

[0036] The first connector body 8 has a third step 20 on its outer wall that can abut against the inner wall of the box, and a third threaded section 23 on the third step 20 away from the first threaded section 9. A sealing nut 22 is provided on the third threaded section 23, and a PTFE gasket 21 is provided on the sealing nut 22 and the third step 20.

[0037] Example 2

[0038] This embodiment provides a cable entry device, such as... Figure 5 and Figure 6 As shown, it includes a second connector body 14, a threaded connector 17, a conical second sealing ring 19, and a metal stepped PTFE bushing compression gasket.

[0039] The second connector body 14 has a second threaded section 15 and a tapered surface 16 disposed adjacent to the second threaded section 15, the second threaded section 15 being provided with an internal thread.

[0040] Threaded connector 17 has a third threaded section 18 that is threadedly connected to the second threaded section 15, such as Figure 6 As shown, the threaded connector 17 also has an internal thread section away from the second thread section 15, which is used for connection with a flexible tube.

[0041] The conical second sealing ring 19 is installed inside the second connector body 14, with one end abutting against the conical surface 16. During the tightening process of the threaded connector 17, the conical second sealing ring 19 and the conical surface 16 fit tightly together, pressing the cable tighter and tighter, which meets the explosion-proof requirements. The material of the conical second sealing ring 19 is EPDM.

[0042] Metal stepped PTFE bushing compression gasket, such as Figure 1 and Figure 2 As shown, the device includes a metal gasket 1 and an L-shaped bushing 4. The metal gasket 1 includes a gasket body 2, and a first step 3 and a second step 7 located at both ends of the outer wall of the gasket body 2. The L-shaped bushing 4 has a bushing body 5 that is pressed and fitted onto the outer wall of the gasket body 2, and a flange 6 located at one end of the bushing body 5 that abuts against the first step 3. The metal gasket 1 abuts against the end of the second sealing ring 19 away from the conical surface 16, and the flange 6 abuts against the end of the third threaded section 18.

[0043] Obviously, the above embodiments are merely illustrative examples for clear explanation and are not intended to limit the implementation. Those skilled in the art will recognize that other variations or modifications can be made based on the above description. It is neither necessary nor possible to exhaustively list all possible implementations here. However, obvious variations or modifications derived therefrom are still within the protection scope of this invention.

Claims

1. A metal stepped PTFE bushing compression gasket, characterized in that, include: The metal gasket (1) includes a gasket body (2) and a first step (3) disposed at one end of the outer wall of the gasket body (2); The L-shaped bushing (4) has a bushing body (5) that is pressed and fitted onto the outer wall of the gasket body (2), and a flange (6) located at one end of the bushing body (5) and abutting against the first step (3).

2. The metal stepped PTFE bushing compression gasket according to claim 1, characterized in that, The other end of the outer wall of the gasket body (2) is provided with a second step (7), which is used to abut against the end of the bushing body (5) away from the flange (6).

3. The metal stepped PTFE bushing compression gasket according to claim 1, characterized in that, The L-shaped bushing (4) has a first chamfer (24) at its perforation.

4. The metal stepped PTFE bushing compression gasket according to claim 2, characterized in that, The outer end face of the second step (7) is provided with a second chamfer (25).

5. A cable entry device, characterized in that, include: The first connector body (8) has a first threaded section (9), and the first threaded section (9) is provided with an external thread; The first clamping nut (10) is threadedly connected to the first threaded section (9), and the end of the first clamping nut (10) away from the first connector body (8) is provided with an inner flange (11); The first sealing ring (12) is installed inside the first clamping nut (10), and one end of the first sealing ring (12) abuts against the end of the first threaded section (9); The metal stepped PTFE bushing compression gasket as described in any one of claims 1-4, wherein the metal gasket (1) abuts against the first sealing ring (12), and the flange (6) abuts against the inner flange (11).

6. The cable introduction device according to claim 5, characterized in that, It also includes a spacer (13) fitted onto the first sealing ring (12), and there is a gap between the outer wall of the spacer (13) and the inner wall of the first clamping nut (10).

7. The cable introduction device according to claim 5, characterized in that, The first connector body (8) has a third step (20) on its outer wall that abuts against the inner wall of the box, and a third threaded section (23) on the third step (20) away from the first threaded section (9). A sealing nut (22) is provided on the third threaded section (23), and a PTFE gasket (21) is provided on the sealing nut (22) and the third step (20).

8. A cable entry device, characterized in that, include: The second connector body (14) has a second threaded section (15) and a tapered surface (16) disposed adjacent to the second threaded section (15), wherein the second threaded section (15) is provided with an internal thread; The threaded joint (17) has a third threaded section (18) that is threadedly connected to the second threaded section (15); A conical second sealing ring (19) is installed inside the second connector body (14), and one end abuts against the conical surface (16); The metal stepped PTFE bushing compression gasket as described in any one of claims 1-4, wherein the metal gasket (1) abuts against the end of the second sealing ring (19) away from the tapered surface (16), and the flange (6) abuts against the end of the third threaded section (18).

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