High-voltage-resistant sealed connector

Abstract

The utility model discloses a high voltage resistant sealed connector, which comprises a conducting rod, at least one insulating tube and a shell, the insulating tube is sleeved outside the conducting rod, the shell is sleeved outside the insulating tube, a first sealing element is arranged between the insulating tube and the conducting rod, a second sealing element is arranged between the shell and the insulating tube, and the first sealing element and the second sealing element are connected with each other. And the conducting rod, the insulating tube and the shell are sealed through the first sealing element and the second sealing element, so that the high voltage resistance and the sealing performance of the connector are ensured. Moreover, the utility model has the advantages of few parts, low dimensional precision requirement, lower cost, high voltage resistance, excellent sealing performance, high yield and the like.

Description

Technical Field

[0001] This utility model relates to the field of sealed connector technology, and in particular to a high-voltage resistant sealed connector. Background Technology

[0002] High-voltage resistant sealed connectors must simultaneously meet two main performance requirements: high voltage resistance and sealing.

[0003] High voltage withstand means that the connector can withstand high voltage (such as above 300V) for an extended period of time, and the conductive rod can pass through the high voltage and operate stably. If the connector is not high voltage withstand, voltage breakdown will occur when passing through high voltage, resulting in an electric arc.

[0004] A seal refers to the ability of a connector to isolate its two ends from the environment for an extended period without media exchange, such as a gas seal or a liquid seal. If the connector is not sealed, gas or liquid leakage will occur. Mature and widely used sealed connectors utilize sealing elements (commonly sealing glass) to achieve a seal. Glass is an excellent electrical insulator; in its molten state, the glass simultaneously wets the conductive rod and the outer shell (e.g.,...). Figure 1 (As shown).

[0005] However, this single-pin solution has low voltage resistance because the glass cannot be higher than the outer shell when it is molten. Therefore, to improve its voltage resistance, the glass wall thickness must be increased. However, increasing the wall thickness will increase the outer diameter of the single pin, which is not conducive to the design and production of multi-pin sealed connectors.

[0006] Currently available mature high-voltage sealed connector solutions on the market include ceramic brazing high-voltage sealed connector single-pin solutions (such as...). Figure 2 (As shown) The single pin of the ceramic brazed high-voltage sealed connector is the core component of the connector, mainly composed of four parts: a conductive rod, a ceramic tube, a housing, and a transition ring. The conductive rod is a good conductor of electricity, and its function is to carry current; the ceramic tube is an electrical insulator, and its function is to prevent current from flowing; the housing allows the single pin to be mounted and welded to other flanges, and a first type of brazing filler is used to seal between the housing and the ceramic tube; the transition ring seals both the ceramic tube and the conductive rod, with a second type of brazing filler used to seal between the transition ring and the ceramic tube, and a third type of brazing filler used to seal between the transition ring and the conductive rod.

[0007] Because ceramic tubes cannot be directly installed onto flanges, and ceramics have poor stress resistance and weldability, they cannot form a seal with flanges. Therefore, this single needle must have a shell to be used. Furthermore, because the coefficients of thermal expansion between the ceramic tube and the conductive rod differ greatly, it is difficult to seal directly with brazing material, which is prone to leakage. Therefore, a transition ring is also essential.

[0008] Examples of ceramic brazed high-voltage sealed connectors with single-pin mounting and welding to a flange can be found by searching "high-voltage vacuum electrode" on Baidu. Ceramic brazed high-voltage sealed connectors are a mature and widely used type of high-voltage sealed connector, offering excellent high-voltage resistance and sealing performance. However, they have the following drawbacks:

[0009] First, the brazing process is complex, and the dimensions of each component, especially the mating dimensions, are strictly regulated. Otherwise, the brazing material will leak or overflow, resulting in poor sealing. The thickness of the brazing material cannot be too thick or too thin. There are many locations that need to be filled with brazing material, and any leakage of brazing material in any place will not work. This places high demands on mass production.

[0010] Secondly, there is a gap between the ceramic tube and the conductive rod, which makes the ceramic tube prone to breakage when subjected to external force.

[0011] Third, the cost is high because there are many parts, the structure is complex, and the dimensional accuracy requirements are high, thus the cost is high.

[0012] Therefore, the existing technology still needs to be improved and enhanced. Utility Model Content

[0013] In view of the shortcomings of the prior art, the purpose of this utility model is to provide a high-voltage resistant sealed connector with a simple structure.

[0014] To solve the above technical problems, the present invention adopts the following technical solution:

[0015] A high-voltage resistant sealed connector includes a conductive rod, at least one insulating tube, and a housing. The insulating tube is sleeved over the conductive rod, and the housing is sleeved over the insulating tube. A first sealing element is provided between the insulating tube and the conductive rod, and a second sealing element is provided between the housing and the insulating tube.

[0016] In the high-voltage resistant sealed connector, the conductive rod is a low-expansion alloy conductive rod, and the outer wall of the conductive rod is covered with an insulating layer.

[0017] In the high-voltage resistant sealed connector, the insulating tube is a zirconia ceramic tube, and one or both ends of the insulating tube are provided with one or two of the following: external thread, internal thread, step, groove, side opening, and bend.

[0018] In the high-voltage resistant sealed connector, the housing is a metal housing with one or more mounting holes for mounting an insulating tube.

[0019] In the high-voltage resistant sealed connector described above, both the first and second sealing elements are glass sealing elements.

[0020] In the high-voltage resistant sealed connector, one or both ends of the insulating tube are higher or lower than the conductive rod.

[0021] In the high-voltage resistant sealed connector, one or both ends of the conductive rod are shaped as one or two of the following: column type, hook type, plate type, blind hole type, internal thread type, external thread type, slot type, and side opening type.

[0022] In the high-voltage resistant sealed connector, both ends of the insulating tube extend beyond the end face of the outer shell.

[0023] In the high-voltage resistant sealed connector, one or both ends of the insulating tube are provided with a concentric tubular structure.

[0024] In the high-voltage resistant sealed connector described above, the insulating tube is a single-hole or multi-hole insulating tube.

[0025] Compared to existing technologies, the high-voltage resistant sealed connector provided by this utility model includes a conductive rod, at least one insulating tube, and a housing. The insulating tube is sleeved over the conductive rod, and the housing is sleeved over the insulating tube. A first sealing element is provided between the insulating tube and the conductive rod, and a second sealing element is provided between the housing and the insulating tube. The first and second sealing elements seal the conductive rod, the insulating tube, and the housing, thereby ensuring the connector's high voltage resistance and sealing performance. It uses fewer parts, has a simpler structure, and is lower in cost. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of a single-pin solution for glass sealing of a high-voltage resistant sealed connector in the prior art.

[0027] Figure 2 This is a schematic diagram of a single-pin design for a ceramic brazed high-voltage sealed connector.

[0028] Figure 3 This is a schematic diagram of the high-voltage resistant sealed connector provided by this utility model.

[0029] Attached image annotations:

[0030] 1. Conductive rod; 2. Insulating tube; 3. Outer shell; 4. First seal; 5. Second seal. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present utility model and are not intended to limit the present utility model.

[0032] It should be noted that when a component is referred to as being "mounted on," "fixed to," or "set on" another component, it can be directly on the other component or may have an intervening component present. When a component is referred to as being "connected to" another component, it can be directly connected to the other component or may have an intervening component present.

[0033] It should also be noted that the directional terms such as left, right, up, and down in the embodiments of this utility model are only relative concepts or references to the normal use state of the product, and should not be considered as restrictive.

[0034] Please see Figure 3 This utility model provides a high-voltage resistant sealed connector comprising a conductive rod 1, at least one insulating tube 2, and a housing 3. The insulating tube 2 is sleeved on the conductive rod 1, and the housing 3 is sleeved on the insulating tube 2. A first sealing element 4 is provided between the insulating tube 2 and the conductive rod 1, and a second sealing element 5 is provided between the housing 3 and the insulating tube 2. The first sealing element 4 and the second sealing element 5 seal the conductive rod 1, the insulating tube 2, and the housing 3, preventing the insulating tube 2 from breaking due to external force due to gaps between the insulating tube 2 and the conductive rod 1, thus ensuring the connector's high-voltage resistance and sealing performance. This utility model uses only 5 parts, is simple and easy to assemble, and reduces product costs.

[0035] In an optional embodiment, the insulating tube 2 and the second sealing element 5 can be designed as a multi-tube, multi-layer encapsulation, that is, there can be more than one insulating tube 2. The insulating tubes 2 are sealed with the second sealing element 5, so that there will be multiple insulating tubes 2 on the outside of the conductive rod 1 to further enhance the voltage resistance performance of the connector.

[0036] It should be noted that the conductive rod 1 is a low-expansion alloy conductive rod, such as commonly used low-expansion alloy materials like 4J29, 4J33, nickel alloys, tungsten alloys, and molybdenum alloys; the insulating tube 2 is a zirconia ceramic tube; the outer shell 3 is a metal shell, such as low-expansion alloy materials, high-expansion alloy materials, stainless steel, carbon steel, and copper alloys; the first sealing element 4 and the second sealing element 5 are both glass sealing elements. The materials used for the conductive rod 1, insulating tube 2, outer shell 3, and sealing elements are only preferred options, and these materials can be varied in actual use. For example, the insulating tube 2 can use other electrical insulating materials, the conductive rod 1 and outer shell 3 can use other metal or alloy materials, and the first sealing element 4 and the second sealing element 5 can use other sealing materials. There are no restrictions here. As long as the basic structure of this utility model is used, it should be included in the protection scope of this utility model.

[0037] In this embodiment, since the glass is in a molten state during sealing, it is deformable and flowable. Therefore, the required fit gap between the conductive rod 1, the insulating tube 2, and the outer shell 3 is not high, and the molten glass can easily fill the gap to achieve a seal. Moreover, there are no strict limitations on the wall thickness of the glass. The structure of the conductive rod 1, the insulating tube 2, and the outer shell 3 is very simple, and complex tolerance fits are not required. In addition, the sealing glass has a lower material cost than ceramic brazing filler, the production process is simpler, and the yield rate is also improved.

[0038] The outer wall of the conductive rod 1 is covered with an insulating layer (not shown in the figure). For example, the conductive rod 1 can be covered with an insulating material by spraying, brushing, plating, or bonding. This can reduce the surface area of ​​the exposed live parts of the conductive rod 1, while only the exposed part of its connecting wires that need to be energized is retained. This can also improve the voltage withstand performance of the connector.

[0039] Preferably, the two ends of the insulating tube 2 are provided with one or two of the following: external threads, internal threads, steps, grooves, side openings, and bends. This is to provide insulation protection for the conductive rod 1 after it is connected to the wire. For example, a threaded insulating cover (not shown in the figure) can be added to completely cover the conductive rod 1 inside the insulating material, which can further enhance the high voltage resistance of the connector.

[0040] In practical use, the outer shell 3 is used to allow the conductive rod 1 to be directly welded and installed onto the metal flange. In an optional embodiment, the outer shell 3 and the flange are integrated, meaning that the insulating tube 2 and the flange are directly sealed using the second sealing element 5, forming a structure that removes the outer shell 3 and replaces it with the flange. This structure is also within the scope of protection of this utility model. The outer shell 3 has one or more mounting holes for installing the insulating tube 2 (forming a flange structure), allowing multiple single pins to be sealed on the same outer shell 3. Each individual conductive rod 1 has its own independent insulating tube 2, thus forming a multi-pin high-voltage resistant sealed connector. Optionally, the insulating tube 2 can be a single-hole or multi-hole insulating tube 2, allowing multiple conductive rods 1 to be sealed on the same insulating tube 2, also achieving a multi-pin high-voltage resistant sealed connector structure; no limitation is imposed here.

[0041] In this embodiment, the wall thickness of the insulating tube 2 and the extension length of the insulating tube 2 and the conductive rod 1 can be modified according to the design. For example, the two ends of the insulating tube 2 can be higher or lower than the conductive rod 1, and the length of the insulating tube 2 can be determined according to actual usage requirements. Theoretically, the longer the insulating tube 2 extends beyond the conductive rod 1, the stronger the voltage withstand performance of the connector. Furthermore, the two ends of the insulating tube 2 extend beyond the end face of the outer shell 3. The higher the insulating tube 2 extends beyond the outer shell 3, the higher the voltage withstand performance of the connector. In addition, the thicker the wall of the insulating tube 2, the stronger its voltage withstand performance.

[0042] Preferably, one or both ends of the conductive rod 1 are shaped as one or two of the following: column type, hook type, plate type, blind hole type, internal thread type, external thread type, groove type, and side opening type, so as to facilitate wiring, be suitable for different wiring schemes, be more user-friendly, and have stronger applicability.

[0043] In this embodiment, one or both ends of the insulating tube 2 are provided with concentric tubular structures (not shown in the figure). That is to say, the part of the insulating tube 2 extending out of the outer shell 3 can be designed as a multi-tube concentric irregular structure. By using a more complex tubular structure, higher voltage withstand performance can be achieved. For example, multiple tubes are concentric, but the multiple tubes are of different lengths. Then, when designing the wiring insulation cover, it can be embedded in the annular gap of the multiple tubes. This makes it convenient to plug and unplug the plug after wiring without reducing the voltage withstand performance.

[0044] In addition to improving upon the shortcomings of ceramic brazing methods, this invention also adds some advantages. The following is a comparison of schematic diagrams from two different solutions, such as... Figure 2 and Figure 3 As shown,

[0045] 1. In this utility model, since the insulating tube 2 is completely open at both ends, the high-voltage withstand structure at both ends of the conductive rod 1 can be made exactly the same. This has two obvious advantages: First, it eliminates the need for a transition ring. In ceramic brazing, the transition ring and the conductor are electrically connected, meaning that the transition ring is also energized when the conductive rod 1 is energized. The outer diameter of the transition ring is much larger than that of the conductive rod 1, so the transition ring must be taken into account when implementing electrical protection. The glass sealing solution does not have this problem. Second, the wiring solutions at both ends (direct wiring or using a wire plug) can be made exactly the same, and the withstand voltage limit values ​​at both ends of the conductive rod 1 are close. However, in the ceramic brazing solution, the withstand voltage limit values ​​at both ends of the conductive rod 1 are different because the structures at both ends are very different.

[0046] 2. In this invention, because the glass completely fills the fitting gap (in actual production, the glass is lower than the end of the insulating tube 2), its sealing length is longer and the sealing strength is higher. In contrast, in the ceramic brazing solution, the brazing material only seals the small contact area between the two parts, making the brazing material prone to cracking and leakage. Furthermore, since the insulating tube 2 is cantilevered, it may break under impact. Additionally, if the assembly gap is not filled or plugged, dust or foreign matter can easily remain inside.

[0047] 3. In this embodiment, since the insulating tube 2 is completely through, besides the option where both ends of the conductive rod 1 extend beyond the insulating tube 2, the two ends of the conductive rod 1 can also be recessed into the two ends of the insulating tube 2. That is, the insulating tube 2 extends further than the conductive rod 1. This option offers stronger high-voltage resistance because the conductive rod 1 is completely isolated by the insulating tube 2. The gap between the insulating tube 2 and the conductive rod 1 is the wall thickness of the first sealing element 4, which can be large or small. Therefore, if this gap is sufficient, there is enough space at both ends of the conductive rod 1 for wiring. This is difficult to achieve with ceramic brazing.

[0048] In summary, the high-voltage resistant sealed connector provided by this utility model includes a conductive rod, at least one insulating tube, and a housing. The insulating tube is sleeved on the conductive rod, and the housing is sleeved on the insulating tube. A first sealing element is provided between the insulating tube and the conductive rod, and a second sealing element is provided between the housing and the insulating tube. The first and second sealing elements seal the conductive rod, the insulating tube, and the housing, thereby ensuring the connector's high-voltage resistance and sealing performance.

[0049] In addition, this utility model has the advantages of low cost, simpler production process and technology, and high yield rate.

[0050] It is understood that those skilled in the art can make equivalent substitutions or modifications based on the technical solution and inventive concept of this utility model, and all such substitutions or modifications should fall within the protection scope of the appended claims.

Claims

1. A high-voltage resistant sealed connector, comprising a conductive rod, at least one insulating tube, and a housing, wherein the insulating tube is sleeved over the conductive rod, and the housing is sleeved over the insulating tube, characterized in that, A first sealing element is provided between the insulating tube and the conductive rod, and a second sealing element is provided between the outer shell and the insulating tube.

2. The high-voltage resistant sealed connector according to claim 1, characterized in that, The conductive rod is a low-expansion alloy conductive rod, and the outer wall of the conductive rod is covered with an insulating layer.

3. The high-voltage resistant sealed connector according to claim 1, characterized in that, The insulating tube is a zirconia ceramic tube, and one or both ends of the insulating tube are provided with one or two of the following: external thread, internal thread, step, groove, side opening, and bend.

4. The high-voltage resistant sealed connector according to claim 1, characterized in that, The outer casing is a metal casing with one or more mounting holes for mounting insulating tubes.

5. The high-voltage resistant sealed connector according to claim 1, characterized in that, Both the first and second seals are glass seals.

6. The high-voltage resistant sealed connector according to claim 3, characterized in that, One or both ends of the insulating tube are higher or lower than the conductive rod.

7. The high-voltage resistant sealed connector according to claim 2, characterized in that, The conductive rod has one or both ends in the shape of a column, hook, plate, blind hole, internal thread, external thread, groove, or side opening, or one or two of these.

8. The high-voltage resistant sealed connector according to claim 6, characterized in that, The two ends of the insulating tube extend beyond the end face of the outer shell.

9. The high-voltage resistant sealed connector according to claim 8, characterized in that, One or both ends of the insulating tube are provided with concentric tubular structures.

10. The high-voltage resistant sealed connector according to claim 9, characterized in that, The insulating tube is a single-hole or multi-hole insulating tube.

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