A small space sealing junction box suitable for a dry vacuum pump

Abstract

The utility model relates to a wiring box for a vacuum pump, in particular to a small-space sealed wiring box suitable for a dry vacuum pump. It effectively reduces the overall volume and solves the problems of large volume, poor sealing performance, inconvenient installation, etc. of the wiring box in the prior art. It includes a box body, a wiring terminal arranged in the box body, a lead wire connected to the wiring terminal at one end, a sealed wiring column, and potting glue filled in the box body. The sealed wiring column is composed of a wiring column body and a stainless steel plate. The wiring column body vertically penetrates through the stainless steel plate, and the two are fixedly connected by glass sintering; the upper end of the wiring column body is inserted into the wiring terminal, and the lower end of the wiring column body extends into the wire passing hole of the dry and wet vacuum pump and is connected to the lead wire of the dry vacuum pump motor winding. The box body is arranged above the stainless steel plate, and the other end of the lead wire passes through the potting glue; the potting glue completely covers the connection parts of the sealed wiring column, the wiring terminal and the lead wire.

Description

Technical Field

[0001] This utility model relates to vacuum pump junction boxes, and more particularly to a small-space sealed junction box suitable for dry vacuum pumps. Background Technology

[0002] The sealed junction box of a dry vacuum pump is a core component for its electrical connections, and its design directly affects the pump's reliability and installation flexibility. Currently, the size of traditional junction boxes is limited by insulation requirements and manufacturing processes, with a height typically between 20 and 40 mm, making it difficult to meet the needs of densely packed equipment or confined spaces. Especially in compact dry vacuum pumps, the larger junction box not only occupies valuable space but also increases installation difficulty.

[0003] The main problem with existing technologies lies in the trade-off between insulation performance and size reduction. Simply reducing the size of the junction box may lead to insufficient electrical clearance, causing breakdown, short circuits, or signal crosstalk. Furthermore, traditional junction boxes often rely on mechanical seals or simple adhesive sealing, which are susceptible to insulation degradation due to moisture penetration or dust intrusion after long-term use, affecting equipment reliability. Some improved solutions employ complex split insulation structures, which can partially alleviate space constraints but increase manufacturing costs and process complexity.

[0004] Therefore, there is an urgent need for a sealed junction box that can reduce its size while ensuring high insulation, reliable sealing and heat dissipation efficiency, so as to meet the installation requirements of confined spaces. Summary of the Invention

[0005] This utility model addresses the shortcomings of existing technologies by providing a small-space sealed junction box suitable for dry vacuum pumps.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: a small-space sealed junction box suitable for dry vacuum pumps, comprising a box body, a terminal block disposed inside the box body, a lead wire connected to the terminal block at one end, a sealing terminal post, and potting compound filled inside the box body.

[0007] The sealed terminal is composed of a terminal body and a stainless steel plate. The terminal body passes vertically through the stainless steel plate, and the two are fixed together by glass sintering. The upper end of the terminal body is inserted into the terminal block, and the lower end of the terminal body extends into the wire hole of the dry vacuum pump and is connected to the lead wire of the dry vacuum pump motor winding.

[0008] The housing is positioned above a stainless steel plate, with the other end of the lead wire passing through the potting compound; the potting compound completely covers the sealing terminal, the terminal block, and the connection of the lead wire.

[0009] Furthermore, an annular sealing groove is provided below the stainless steel plate, and a sealing ring is embedded in the sealing groove to achieve a sealed connection of the dry vacuum pump motor.

[0010] Furthermore, the housing is fixed to the stainless steel plate of the sealing terminal block by M3 hexagonal screws.

[0011] Furthermore, the sealing terminal is connected to the dry vacuum pump motor via an M4 hex socket screw.

[0012] Furthermore, the sealing terminal has 5 terminal bodies.

[0013] Furthermore, a glass body is provided between the terminal block and the stainless steel plate to achieve a sealed connection. This glass body is a sealed connection structure formed by glass sintering process.

[0014] Furthermore, the box body is provided with four partitions, which divide the internal space into five independent wiring unit chambers, each wiring unit chamber corresponding to the upper part of a wiring post.

[0015] Furthermore, the bottom and one side of the box are open, and the open bottom is fastened to the stainless steel plate to form a mating mounting surface, and the other end of the lead wire passes out from the open side.

[0016] Furthermore, the potting compound fills the internal cavity of the box and covers and seals the connection points of the terminals and the protruding sections of the lead wires.

[0017] Compared with the prior art, this utility model has the following advantages.

[0018] This utility model provides a small-space sealed junction box suitable for dry vacuum pumps. It has a reasonable structural design, excellent sealing performance, and convenient installation. While ensuring high insulation and long-term reliability, it effectively reduces the overall size and solves the problems of large size, poor sealing, and inconvenient installation of junction boxes in the prior art. Attached Figure Description

[0019] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. The scope of protection of the present invention is not limited to the following description.

[0020] Figure 1 This is a partial sectional view of the sealed junction box.

[0021] Figure 2-3 This is a schematic diagram of the installation of a sealed junction box.

[0022] Figure 4 This is a schematic diagram of the structure of a sealed terminal block.

[0023] Figure 5This is a schematic diagram of the terminal block structure.

[0024] Figure 6 This is a schematic diagram of the installation of wiring terminals and lead wires.

[0025] Figure 7 This is a schematic diagram of the junction box structure.

[0026] Figure 8 This is a top view of the sealed terminal block.

[0027] In the diagram, 1 is the housing; 101 is the open bottom; 102 is the open side; 103 is the partition; 104 is the wiring unit chamber; 2 is the wiring terminal; 3 is the lead wire; 4 is the sealing ring; 5 is the sealing terminal; 501 is the stainless steel plate; 502 is the terminal body; 503 is the sealing groove; 504 is the glass body; 6 is the potting compound; 7 is the M3 socket head cap screw; 8 is the M4 socket head cap screw; 9 is the dry vacuum pump; and 901 is the wiring port. Detailed Implementation

[0028] like Figure 1-8 As shown, a small-space sealed junction box suitable for dry vacuum pumps includes a box body 1, a terminal block 2 disposed within the box body 1, a lead wire 3 connected at one end to the terminal block 2, a sealed terminal post 5, and potting compound 6 filled within the box body 1. The sealed terminal post 5 is composed of a terminal post body 502 and a stainless steel plate 501. The terminal post body 502 passes vertically through the stainless steel plate 501, and the two are fixedly connected by glass sintering. The upper end of the terminal post body 502 is inserted into the terminal block 2, and the lower end of the terminal post body 502 extends into the wiring port of the dry vacuum pump and is welded to the lead wire of the dry vacuum pump motor winding. The box body 1 is positioned above the stainless steel plate 501, and the other end of the lead wire 3 extends out through the potting compound 6. The potting compound 6 completely covers the connection parts of the sealed terminal post 5, the terminal block 2, and the lead wire 3. This structure is compact and suitable for the limited space environment of dry vacuum pumps. By incorporating terminals and sealed terminals within the junction box, and using potting compound to completely seal the internal electrical connections, the system effectively prevents the ingress of external moisture, dust, and other impurities, thereby improving the box's sealing and insulation performance. Simultaneously, the sealed terminals utilize a glass sintering process to achieve a high-strength seal between the metal and ceramic components, ensuring excellent airtightness, insulation, and mechanical stability between the terminal body and the stainless steel plate.

[0029] Preferably, the housing 1 is fixed to the stainless steel plate 501 of the sealing terminal 5 using M3 hex socket screws 7. Using M3 hex socket screws for fixing not only facilitates installation but also enhances the reliability and tightness of the connection, avoiding loosening problems caused by vibration or external forces.

[0030] Preferably, the sealing terminal block 5 has five terminal blocks 502. A glass body 504 is provided between the terminal block 502 and the stainless steel plate 501 to achieve a sealed connection. This glass body 504 is a sealed connection structure formed by glass sintering. An annular sealing groove 503 is provided below the stainless steel plate 501, and a sealing ring 4 is embedded in the sealing groove 503 for sealing the dry vacuum pump motor 9. The sealing terminal block 5 is connected to the dry vacuum pump motor 9 by M4 socket head cap screws 8. The design of five terminal blocks can meet the needs of multiple power supplies or signal transmissions, providing strong adaptability. The sealing structure formed by the glass sintering process has excellent high-temperature resistance and corrosion resistance, ensuring long-term sealing reliability between the terminal block and the stainless steel plate. The cooperation between the annular sealing groove and the sealing ring further improves the sealing level between the junction box and the motor, preventing media leakage and enhancing explosion-proof and protective capabilities.

[0031] Preferably, the box body 1 has four partitions 103 inside, dividing the internal space into five independent wiring unit chambers 104, each corresponding to the upper part of a terminal block 502. The bottom and one side of the box body 1 are open, with the open bottom 101 fastened to the stainless steel plate 501 to form a mating mounting surface, and the other end of the lead wire 3 protruding from the open side 102. The potting compound 6 fills the internal cavity of the box body 1 and covers and seals the connection between the terminal block 5 and the terminal 2, as well as the protruding section of the lead wire 3. By setting partitions to divide the interior of the box body into multiple independent chambers, physical isolation between each wiring unit is achieved, avoiding current interference or short circuit risks, and improving safety and maintenance convenience. The open design of the bottom and side of the box body facilitates assembly and wiring operations, improving production efficiency. The potting compound fully fills the entire cavity, forming a complete sealing protective layer, enhancing the overall moisture-proof, shock-proof, and dust-proof capabilities.

[0032] This invention relates to a small-space sealed junction box for dry vacuum pumps, wherein a small space can refer to a junction box with a height of 20mm or less. After the junction box is connected to the sealing terminals, the gaps between the terminals are filled with potting compound. The potting compound has high insulation properties, thus reducing the safety distance between the terminals. This also reduces the risk of crosstalk, achieves the purpose of reducing size, and can isolate moisture to avoid short circuits.

[0033] Installation and manufacturing instructions:

[0034] 1. Crimp the lead wire 3 to the terminal 2 together.

[0035] 2. After the sealing terminal 5 and the vacuum pump motor winding lead wire are welded through the lower welding cup, the sealing ring 4 is placed into the sealing groove of the sealing terminal 5, and the sealing terminal 5 is connected to the vacuum pump motor 9 through 4 M4 socket head cap screws 8.

[0036] 3. Insert the crimped terminals and lead wires into the sealed terminal block 5, and use two Allen screws to fix the junction box 1 to the sealed terminal block.

[0037] 4. After installation, stand the junction box upright with the opening facing upwards, and use potting compound 6 to fill the gap between the box body 1, the sealing terminal 5, and the lead wire 3. Let it stand and wait for the potting compound to cure.

[0038] Technical notes: After the base adhesive is applied, vacuuming should be performed for 3-5 minutes to eliminate air bubbles and prevent partial discharge; multi-strand wires should be encased in fiberglass tubing or heat shrink tubing to prevent adhesive from seeping into the wire core.

[0039] It is understood that the above specific description of this utility model is only used to illustrate this utility model and is not limited to the technical solutions described in the embodiments of this utility model. Those skilled in the art should understand that modifications or equivalent substitutions can still be made to this utility model to achieve the same technical effect; as long as the use needs are met, they are all within the protection scope of this utility model.

Claims

1. A small-space sealed junction box suitable for dry vacuum pumps, characterized in that, Includes a box body (1), a wiring terminal (2) provided inside the box body (1), a lead wire (3) with one end connected to the wiring terminal (2), a sealing terminal (5), and potting compound (6) filled inside the box body (1); The sealed terminal (5) is composed of a terminal body (502) and a stainless steel plate (501). The terminal body (502) passes vertically through the stainless steel plate (501), and the two are fixed together by glass sintering. The upper end of the terminal body (502) is inserted into the terminal (2), and the lower end of the terminal body (502) extends into the wire hole of the dry vacuum pump and is connected to the lead wire of the motor winding of the dry vacuum pump. The box body (1) is positioned above the stainless steel plate (501), and the other end of the lead wire (3) passes through the potting compound (6); the potting compound (6) completely covers the connection parts of the sealing terminal (5), the terminal (2) and the lead wire (3).

2. The sealed junction box according to claim 1, characterized in that: The stainless steel plate (501) is provided with an annular sealing groove (503) below, and a sealing ring (4) is embedded in the sealing groove (503) to achieve a sealed connection of the dry vacuum pump motor (9).

3. The sealed junction box according to claim 1, characterized in that: The box (1) is fixed to the stainless steel plate (501) of the sealing terminal (5) by M3 hexagonal screws (7).

4. The sealed junction box according to claim 1, characterized in that: The sealing terminal (5) is connected to the dry vacuum pump motor (9) via an M4 socket head cap screw (8).

5. The sealed junction box according to claim 1, characterized in that: The sealing terminal (5) has 5 terminal bodies (502).

6. The sealed junction box according to claim 1, characterized in that: A glass body (504) is provided between the terminal block (502) and the stainless steel plate (501) to achieve a sealed connection. The glass body (504) is a sealed connection structure formed by glass sintering process.

7. The sealed junction box according to claim 1, characterized in that: The box (1) has four partitions (103) inside, which divide the internal space into five independent wiring unit chambers (104). Each wiring unit chamber (104) corresponds to the upper part of a wiring post (502).

8. The sealed junction box according to claim 1, characterized in that: The bottom and one side of the box (1) are open. The open bottom (101) is fastened to the stainless steel plate (501) to form a mating mounting surface. The other end of the lead wire (3) passes through the open side (102).

9. The sealed junction box according to claim 8, characterized in that: The potting compound (6) fills the internal cavity of the box (1) and covers and seals the connection between the terminal block (5) and the terminal (2) as well as the protruding section of the lead wire (3).

Images