Hermetic terminal

Abstract

The application belongs to the technical field of terminal sealing, and discloses an airtight terminal, which comprises a conductive column, a spacing sleeve, two sealing members, a fixing assembly and an adjusting assembly. The conductive column is arranged in a through hole of an external interface plate. The spacing sleeve and the two sealing members are arranged on the conductive column, and the two sealing members are respectively arranged at two ends of the spacing sleeve. The fixing assembly is arranged at one end of the conductive column and abuts against one of the sealing members. The adjusting assembly is arranged at the other end of the conductive column and abuts against the other sealing member. The adjusting assembly can extrude one of the sealing members and extrude the other sealing member through the spacing sleeve, so that the two sealing members are deformed to abut against the inner wall of the through hole. The sealing effect of the sealing members on the external interface plate can be adjusted by adjusting the extrusion force of the adjusting assembly. The airtight terminal can adjust the abutting effect of the sealing members on the inner wall of the through hole by adjusting the extrusion force of the adjusting assembly, thereby improving the practicability and enabling the airtight terminal to be used in a high-pressure environment.

Description

Technical Field

[0001] This invention relates to the field of terminal sealing technology, and more particularly to an airtight terminal. Background Technology

[0002] Pressure-bearing motors require the installation of airtight terminals with a certain sealing performance to ensure that gas leakage does not occur. Existing airtight terminals are located on the external interface plate of the pressure-bearing motor. The airtight terminal includes a conductive post, an insulating glass body, and an insulating ceramic body. The external interface plate has a through-hole stepped hole. The conductive post passes through the stepped hole and is sealed by the insulating glass body and the inner wall of the stepped hole. The insulating ceramic body is fitted around the conductive post and sealed to the stepped hole. This structure provides a good seal between the conductive post and the external interface plate through the insulating glass body and the insulating ceramic body. However, for some pressure-bearing motors that need to withstand high pressure (such as airtight pressures exceeding 10 MPa), the sealing performance of the insulating glass body and the insulating ceramic body is insufficient to withstand the high pressure, leading to gas leakage in the pressure-bearing motor. Furthermore, the pressure-bearing capacity of this airtight terminal cannot be adjusted according to requirements.

[0003] Therefore, there is an urgent need for an airtight terminal to solve the problem of poor high-pressure sealing in pressure-bearing motors. Summary of the Invention

[0004] The purpose of this invention is to provide an airtight terminal that is suitable for high-pressure environments and whose pressure-bearing capacity can be adjusted according to actual needs.

[0005] To achieve this objective, the present invention adopts the following technical solution:

[0006] Hermetic terminals, including:

[0007] A conductive post, with cables connected to both ends of the conductive post;

[0008] A spacer sleeve and two seals are provided, both of which are fitted onto the conductive post, with the two seals located at opposite ends of the spacer sleeve.

[0009] A fixing component is fixedly disposed at one end of the conductive post and abuts against one of the sealing elements;

[0010] An adjustment component is disposed at the other end of the conductive post and abuts against another of the seals. The adjustment component is capable of compressing the two seals and adjusting the compressive force on the seals.

[0011] As an alternative, the adjusting assembly includes a first nut, a first bushing, an elastic element, and a second bushing. The first bushing, the elastic element, and the second bushing are all slidably sleeved on the conductive post, and the elastic element is sandwiched between the first bushing and the second bushing. The first nut is threaded onto the conductive post and abuts against the first bushing. A sealing element is disposed between the spacer sleeve and the second bushing. Rotating the first nut can drive the first bushing to move to squeeze the sealing element.

[0012] As an alternative, the conductive post includes a first cylindrical segment, a second cylindrical segment, and a third cylindrical segment, wherein the second cylindrical segment and the third cylindrical segment are respectively connected to the two ends of the first cylindrical segment.

[0013] As an alternative, the first bushing includes a first clamping part sleeved on the first cylindrical segment and a first limiting part sleeved on the second cylindrical segment. The first clamping part and the first limiting part are connected to each other. The first limiting part has a gap with the stepped surface between the first cylindrical segment and the second cylindrical segment. The first nut is threadedly connected to the second cylindrical segment and abuts against the end of the first limiting part away from the gap. The elastic element is clamped between the first clamping part and the second bushing.

[0014] As an alternative, the adjustment assembly further includes an adjustment shim, which is sleeved on the first cylindrical section and sandwiched between the elastic member and the first pressing part, for adjusting the gap.

[0015] As an optional embodiment, the fixing assembly includes a second nut, a third bushing, and a fourth bushing. The third bushing includes a second clamping part and a second limiting part connected to each other. The second clamping part is sleeved on the first cylindrical segment, and the second limiting part is sleeved on the third cylindrical segment and abuts against the stepped surface between the first cylindrical segment and the third cylindrical segment. The fourth bushing is sleeved on the first cylindrical segment and its two ends abut against the second clamping part and a seal, respectively. The second nut is threadedly connected to the third cylindrical segment and abuts against the end of the second limiting part away from the second clamping part.

[0016] As an alternative, the conductive post is provided with an air channel, the spacer sleeve is provided with an air outlet, and the air outlet of the air channel is connected to the air outlet.

[0017] As an alternative, the inner wall of the spacer sleeve is provided with an annular groove that communicates with the air outlet, and the air outlet of the air passage is located in the annular groove.

[0018] As an optional solution, the air inlet of the air passage is provided with an air nozzle connection thread.

[0019] As an optional solution, the seal is an O-ring.

[0020] The beneficial effects of this invention are:

[0021] This invention provides an airtight terminal, comprising a conductive post, a spacer sleeve, two sealing elements, a fixing component, and an adjusting component. Cables are connected to both ends of the conductive post, which passes through a through-hole in an external interface plate. The spacer sleeve and the two sealing elements are fitted onto the conductive post, with the two sealing elements located at opposite ends of the spacer sleeve. The fixing component is fixedly disposed at one end of the conductive post and abuts against one of the sealing elements. The adjusting component is disposed at the other end of the conductive post and abuts against the other sealing element. The adjusting component can compress one sealing element and, through the spacer sleeve, compress the other sealing element, causing both sealing elements to deform and abut against the inner wall of the through-hole. By adjusting the compressive force, the sealing effect between the sealing element and the external interface plate can be adjusted. This airtight terminal, by adjusting the compressive force on the sealing element through the adjusting component, can adjust the abutment effect of the sealing element against the inner wall of the through-hole, thereby adjusting the pressure-bearing capacity of the airtight terminal according to actual needs, improving practicality, and enabling use in high-pressure environments. Attached Figure Description

[0022] Figure 1 This is a schematic diagram of the overall structure of the airtight terminal provided in an embodiment of the present invention;

[0023] Figure 2 This is a schematic diagram of the structure of the first nut provided in an embodiment of the present invention;

[0024] Figure 3 This is a schematic diagram of the structure of the conductive pillar provided in an embodiment of the present invention;

[0025] Figure 4 This is a schematic diagram of the spacer sleeve provided in an embodiment of the present invention.

[0026] In the picture:

[0027] 100. Cable; 200. External interface board; 300. External hexagonal nut;

[0028] 1. Conductive post; 11. First cylindrical section; 12. Second cylindrical section; 13. Third cylindrical section; 14. Air passage; 141. Axial air passage; 142. Radial air passage; 15. Insulating potting varnish;

[0029] 2. Spacer sleeve; 21. Air vent; 22. Annular groove;

[0030] 3. Sealing components;

[0031] 4. Fixing component; 41. Second nut; 42. Third bushing; 43. Fourth bushing;

[0032] 5. Adjusting component; 51. First nut; 511. Process groove; 52. First bushing; 53. Elastic element; 54. Second bushing; 55. Adjusting shim. Detailed Implementation

[0033] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar components or components having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0034] In the description of this invention, unless otherwise explicitly specified and limited, the terms "connected," "linked," and "fixed" should be interpreted broadly. For example, they can refer to a fixed connection or a detachable connection; a mechanical connection or an electrical connection; a direct connection or an indirect connection through an intermediate medium; or the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0035] In the description of this invention, unless otherwise expressly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature being directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0036] The technical solution of the present invention will be further described below with reference to the accompanying drawings and specific embodiments.

[0037] This invention provides an airtight terminal for use in ultra-high voltage and high current motors. It is easy to manufacture and has self-testing capabilities, eliminating the need for specialized equipment to test the airtightness of the terminal, making it more convenient to use.

[0038] like Figures 1-4As shown, the airtight terminal includes a conductive post 1, a spacer sleeve 2, a fixing component 4, an adjusting component 5, and two sealing elements 3. The conductive post 1 is connected to the cable 100 at both ends via copper lugs, and the conductive post 1 passes through the through hole of the external interface plate 200 of the pressure-bearing motor. The spacer sleeve 2 and two seals 3 are both sleeved on the conductive post 1, and the two seals 3 are located at both ends of the spacer sleeve 2. The fixing component 4 is fixedly installed at one end of the conductive post 1, and one seal 3 is sandwiched between one end of the spacer sleeve 2 and the fixing component 4. The adjusting component 5 is installed at the other end of the conductive post 1, and the other seal 3 is sandwiched between the other end of the spacer sleeve 2 and the adjusting component 5. The adjusting component 5 can apply a squeezing force toward the fixing component 4 to squeeze the two seals 3 at the same time, so as to compress the seals 3 and make them abut against the inner wall of the through hole, so that when the conductive post 1 passes through the through hole, the airtight terminal can seal with the through hole to prevent high-pressure gas leakage in the pressure-bearing motor. The adjusting component 5 can also adjust the squeezing force to adjust the sealing effect between the seal 3 and the external interface plate 200.

[0039] The airtight terminal adjusts the pressure on the seal 3 by adjusting the adjustment component 5, which can adjust the contact effect of the seal 3 with the inner wall of the through hole, so as to adjust the pressure bearing capacity of the airtight terminal according to actual needs, improve practicality, and enable it to be used in high-pressure environments.

[0040] Optionally, the adjusting assembly 5 includes a first nut 51, a first bushing 52, an elastic element 53, and a second bushing 54. The first bushing 52, the elastic element 53, and the second bushing 54 are all slidably fitted onto the conductive post 1, with the elastic element 53 sandwiched between the first bushing 52 and the second bushing 54. The first nut 51 is threaded onto the conductive post 1 and abuts against the first bushing 52. One sealing element 3 is sandwiched between one end of the spacer sleeve 2 and the fixing assembly 4, and another sealing element 3 is sandwiched between the other end of the spacer sleeve 2 and the second bushing 54. Rotating the first nut 51 causes it to move towards the fixing assembly 4, pushing the first bushing 52 to move. The first bushing 52 compresses the second bushing 54 through the elastic element 53. Since the fixing assembly 4 is fixed to the conductive post 1, the second bushing 54 compresses one sealing element 3 and, through the spacer sleeve 2, compresses the other sealing element 3. This structure allows for easy compression of the sealing element 3 by rotating the first nut 51; furthermore, the compressive force is transmitted to the sealing element 3 via the elastic element 53, making the structural design more rational. In this embodiment, the elastic element 53 is a disc spring.

[0041] Reference Figure 2 The first nut 51 has multiple process grooves 511 at the end opposite to the first bushing 52, which are used to assist in tightening the first nut 51.

[0042] Specifically, the conductive post 1 is a copper post, comprising a first cylindrical segment 11, a second cylindrical segment 12, and a third cylindrical segment 13. The second cylindrical segment 12 and the third cylindrical segment 13 are respectively connected to the two ends of the first cylindrical segment 11, and the diameters of the second cylindrical segment 12 and the third cylindrical segment 13 are equal and smaller than the diameter of the first cylindrical segment 11. The first cylindrical segment 11 is the part connected to the through hole, and the second cylindrical segment 12 and the third cylindrical segment 13 are respectively connected to the cable 100.

[0043] More specifically, the spacer sleeve 2, the second bushing 54, the elastic element 53, and the sealing element 3 are all slidably fitted onto the first cylindrical section 11. The first bushing 52 includes a first pressing part fitted onto the first cylindrical section 11 and a first limiting part fitted onto the second cylindrical section 12. The first pressing part and the first limiting part are connected to each other, and there is a gap between the first limiting part and the stepped surface between the first cylindrical section 11 and the second cylindrical section 12. The first nut 51 is threaded onto the second cylindrical section 12 and abuts against the end of the first limiting part away from the gap. The elastic element 53 is sandwiched between the first pressing part and the second bushing 54. This structure can limit the extrusion force of the adjusting component 5 by limiting the movement distance of the first bushing 52, so as to prevent the excessive extrusion force from damaging the sealing element 3.

[0044] Preferably, the adjusting assembly 5 further includes an adjusting shim 55, which is sleeved on the first cylindrical section 11 and sandwiched between the elastic member 53 and the first pressing part. The number of adjusting shims 55 can be increased or decreased, and the size of the gap between the first limiting part and the step surface between the first cylindrical section 11 and the second cylindrical section 12 can be adjusted to prevent the deformation of the sealing member 3 from being too large or too small due to excessive or insufficient extrusion pressure.

[0045] The fixing assembly 4 includes a second nut 41, a third bushing 42, and a fourth bushing 43. The third bushing 42 includes a second clamping part and a second limiting part connected to each other. The second clamping part is sleeved on the first cylindrical section 11, and the second limiting part is sleeved on the third cylindrical section 13 and abuts against the stepped surface between the first cylindrical section 11 and the third cylindrical section 13. The fourth bushing 43 is sleeved on the first cylindrical section 11, with both ends abutting against the second clamping part and a seal 3, respectively. The second nut 41 is threadedly connected to the third cylindrical section 13 and abuts against the end of the second limiting part away from the second clamping part. This structure allows the fourth bushing 43 to provide a reaction force, ensuring that the seal 3 is effectively compressed, and the fixing assembly 4 makes assembly more convenient.

[0046] Cables 100 are respectively installed on the second cylindrical section 12 and the third cylindrical section 13, and the cables 100 on the second cylindrical section 12 are pressed to the first nut 51 by two external hexagonal nuts 300, and the cables 100 on the third cylindrical section 13 are pressed to the second nut 41.

[0047] In this embodiment, the seal 3 is an O-ring.

[0048] It should be noted that the outer wall of the first cylindrical section 11 of the conductive post 1 is provided with insulating potting varnish 15. The spacer sleeve 2, elastic element 53, adjusting shim 55, second bushing 54 and fourth bushing 43 are always fitted on the outer wall of the insulating potting varnish 15. Therefore, the spacer sleeve 2, second bushing 54 and fourth bushing 43 can be made of metal materials with certain hardness and strength. Metal materials have good processing performance and can be installed with high precision. The first bushing 52 and third bushing 42 are made of insulating materials to ensure insulation performance and prevent current from being transmitted to the external interface board 200.

[0049] Preferably, in order to ensure that the insulating potting varnish 15 can be firmly installed, the outer wall of the first cylindrical section 11 is provided with multiple hanging grooves at intervals to increase the connection firmness of the insulating potting varnish 15.

[0050] In this embodiment, for ease of processing, the first nut 51 and the second nut 41 have the same structure, the first bushing 52 and the third bushing 42 have the same structure, and the second bushing 54 and the fourth bushing 43 have the same structure.

[0051] To enable the airtight terminal to perform self-testing and ensure that its airtightness meets the usage requirements, refer to... Figures 3-4 The conductive post 1 has an air passage 14, and the spacer sleeve 2 has an air outlet 21. The air outlet of the air passage 14 is connected to the air outlet 21 of the spacer sleeve 2. By connecting the high-pressure air source device to the air inlet of the air passage 14, the high-pressure gas generated by the high-pressure air source device can enter the air passage 14 and be discharged through the air outlet 21. The air outlet 21 is located between the two seals 3. By applying a leak detection agent between the external interface plate 200 and the conductive post 1, the presence of a leak detection agent can be observed to detect whether there is a leak between the two seals 3 and the external interface plate 200.

[0052] Furthermore, the air inlet of the air passage 14 is provided with a nozzle connection thread, and the nozzle connector can be connected to the air inlet of the air passage 14 through the nozzle connection thread. The high-pressure air source equipment is connected to the nozzle connector through a pipeline to make the connection more convenient.

[0053] To make installation easier, an annular groove 22 is provided on the inner wall of the spacer sleeve 2, and the air outlet 21 is connected to the annular groove 22. During assembly, the air outlet of the air passage 14 only needs to be located in the annular groove 22 to achieve connection between the air outlet of the air passage 14 and the air outlet 21 of the spacer sleeve 2, making assembly easier and the structure more reasonable.

[0054] In this embodiment, the air passage 14 includes an axial air passage 141 and a radial air passage 142 that are interconnected. The axial air passage 141 extends axially from one end of the conductive post 1, and the radial air passage 142 passes through the first cylindrical section 11 of the conductive post 1 and is connected to the axial air passage 141.

[0055] This airtight terminal can be manufactured in-house according to requirements, with low processing and assembly difficulty. It is suitable for high-voltage environments, and the specifications of the conductive post 1 can be adjusted according to actual needs to meet high-current applications. In addition, this airtight terminal has a self-testing function, which can test its own airtightness. When a gas leak occurs in a pressure-bearing motor, the first step is to confirm whether the airtight terminal is qualified, so as to quickly eliminate the fault. Moreover, no special airtightness testing equipment is required, which improves its practicality.

[0056] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the implementation of the present invention. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively describe all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. An airtight terminal suitable for high-voltage environments, characterized in that: include: Conductive post (1), with cables (100) connected to both ends of the conductive post (1); Spacer sleeve (2) and two seals (3), the spacer sleeve (2) and the two seals (3) are both sleeved on the conductive post (1), and the two seals (3) are respectively located at both ends of the spacer sleeve (2); Fixing component (4), which is fixedly disposed at one end of the conductive post (1) and abuts against a sealing element (3); Adjustment component (5), the adjustment component (5) is disposed at the other end of the conductive post (1) and abuts against another seal (3), the adjustment component (5) is capable of squeezing the two seals (3) and adjusting the squeezing force on the seals (3); The conductive post (1) has an air passage (14), and the spacer sleeve (2) has an air outlet (21). The air outlet of the air passage (14) is connected to the air outlet (21).

2. The airtight terminal according to claim 1, characterized in that, The adjusting assembly (5) includes a first nut (51), a first bushing (52), an elastic element (53), and a second bushing (54). The first bushing (52), the elastic element (53), and the second bushing (54) are all slidably sleeved on the conductive post (1), and the elastic element (53) is sandwiched between the first bushing (52) and the second bushing (54). The first nut (51) is threaded onto the conductive post (1) and abuts against the first bushing (52). A sealing element (3) is disposed between the spacer sleeve (2) and the second bushing (54). Rotating the first nut (51) can drive the first bushing (52) to move to squeeze the sealing element (3).

3. The airtight terminal according to claim 2, characterized in that, The conductive post (1) includes a first cylindrical segment (11), a second cylindrical segment (12) and a third cylindrical segment (13), with the second cylindrical segment (12) and the third cylindrical segment (13) respectively connected to the two ends of the first cylindrical segment (11).

4. The airtight terminal according to claim 3, characterized in that, The first bushing (52) includes a first pressing part sleeved on the first cylindrical segment (11) and a first limiting part sleeved on the second cylindrical segment (12). The first pressing part and the first limiting part are connected to each other. The first limiting part has a gap with the step surface between the first cylindrical segment (11) and the second cylindrical segment (12). The first nut (51) is threaded to the second cylindrical segment (12) and abuts against the end of the first limiting part away from the gap. The elastic element (53) is sandwiched between the first pressing part and the second bushing (54).

5. The airtight terminal according to claim 4, characterized in that, The adjustment assembly (5) further includes an adjustment shim (55), which is sleeved on the first cylindrical section (11) and sandwiched between the elastic member (53) and the first pressing part, for adjusting the gap.

6. The airtight terminal according to claim 3, characterized in that, The fixing component (4) includes a second nut (41), a third bushing (42), and a fourth bushing (43). The third bushing (42) includes a second clamping part and a second limiting part connected to each other. The second clamping part is sleeved on the first cylindrical section (11), and the second limiting part is sleeved on the third cylindrical section (13) and abuts against the stepped surface between the first cylindrical section (11) and the third cylindrical section (13). The fourth bushing (43) is sleeved on the first cylindrical section (11) and its two ends abut against the second clamping part and a seal (3) respectively. The second nut (41) is threaded to the third cylindrical section (13) and abuts against the end of the second limiting part away from the second clamping part.

7. The airtight terminal according to claim 1, characterized in that, The inner wall of the spacer sleeve (2) is provided with an annular groove (22) that communicates with the air outlet (21), and the air outlet of the air passage (14) is located in the annular groove (22).

8. The airtight terminal according to claim 1, characterized in that, The air inlet of the air passage (14) is provided with an air nozzle connection thread.

9. The airtight terminal according to any one of claims 1-6, characterized in that, The sealing element (3) is an O-ring.

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