Flange cover for an explosion-proof electrical connector

Abstract

This utility model relates to a flange cover for an explosion-proof electrical connector, comprising a cover body with an axially extending through hole. A first positioning step and a second positioning step are provided at one end of the through hole adjacent to the mounting portion. The wall of the through hole has spiral grooves arranged axially along the through hole in a spiral shape. A first groove arranged in annular arrangement is provided at the connection between the step surface of the first positioning step and the side surface; a second groove arranged in annular arrangement is provided at the connection between the step surface of the second positioning step and the side surface. Double sealing is achieved by using two independent sealing rings. The spiral groove design constitutes another line of defense; its spiral path effectively blocks and delays the straight-line intrusion of external explosive gases, dust, or moisture. Combined with the double groove seal, it forms a composite sealing system of solid seal and labyrinth seal, comprehensively improving the reliability of the static seal.

Description

Technical Field

[0001] This utility model relates to the field of explosion-proof electrical connector technology, specifically a flange cover for an explosion-proof electrical connector. Background Technology

[0002] In flammable and explosive environments, electrical connectors, as critical interfaces for power transmission and signal control, are of paramount importance in terms of safety and reliability. Flange covers, as an important component of electrical connectors, play a crucial role in isolating external hazardous media and protecting internal electrical components. Therefore, the quality of their sealing performance directly determines the explosion-proof safety level of the entire electrical equipment and even the entire production system.

[0003] Currently, common flange cover sealing structures mainly rely on planar seals or simple O-ring groove seals. Planar seals are simple and low-cost. However, this sealing method has extremely high requirements for the flatness and roughness of the flange cover and mounting surface. Under conditions such as uneven bolt preload or long-term vibration and thermal cycling, tiny gaps can easily form, leading to seal failure. Although simple O-ring groove structures are an improvement over planar seals, they are usually single-seal, and the groove design is limited, resulting in insufficient sealing reliability.

[0004] Therefore, there is an urgent need for a flange cover design with innovative structure and superior performance to overcome the shortcomings of existing technologies. Utility Model Content

[0005] To address the technical problems in the background art, this utility model discloses a flange cover for an explosion-proof electrical connector.

[0006] This utility model provides a flange cover for an explosion-proof electrical connector, including a cover body, one end of which is a mounting part fixedly connected to the explosion-proof electrical connector; the cover body is provided with an axially extending through hole, and one end of the through hole adjacent to the mounting part is provided with a first positioning step and a second positioning step connected in sequence with decreasing diameter, for mounting and positioning the explosion-proof electrical connector; the hole wall of the through hole is provided with a spiral groove arranged axially along the through hole and in a spiral shape. The first positioning step has a first groove arranged in a ring at the connection between the step surface and the side surface. The first groove is used to engage the sealing ring. The second positioning step has a second groove arranged in a ring at the connection between the step surface and the side surface. The second groove is used to engage the sealing ring.

[0007] Furthermore, the first and second grooves have the same structure, and their recess depths on the stepped surface and the side are consistent.

[0008] Furthermore, the cross-sections of the first and second grooves are curved.

[0009] Furthermore, in the axial projection of the through hole, a portion of the inner region of the first groove overlaps with a portion of the outer region of the second groove.

[0010] Furthermore, the depth of the spiral groove increases from the mounting section to the other end.

[0011] Furthermore, the helix angle of the spiral groove is 15-45°.

[0012] Furthermore, the cross-section of the spiral groove is semi-circular.

[0013] The beneficial effects of this utility model are: 1. This utility model achieves double sealing by setting two independent sealing rings. Even if one sealing ring fails due to aging, wear or local deformation, the other sealing ring can still provide an effective seal, which greatly reduces the risk of overall seal failure due to single-point failure.

[0014] The spiral groove design forms another line of defense. Its spiral path can effectively block and delay the straight intrusion of external explosive gases, dust or moisture. Together with the double groove seal, it forms a composite sealing system of solid seal and labyrinth seal, which comprehensively improves the reliability of static seal.

[0015] 2. The positions of the first and second grooves are set so that both the first and second grooves are recessed on the stepped surface and the side surface, thereby achieving a sealing effect on both the stepped surface and the side surface.

[0016] 3. The first and second positioning steps are not only used for the installation and positioning of explosion-proof electrical connectors, but also for classifying and guiding the interaction forces between components, avoiding stress concentration, and making the sealing ring more evenly stressed. As a result, it can maintain the sealing performance more stably under harsh working conditions such as long-term vibration and thermal cycling, and extend its service life. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0018] Figure 1 This is a schematic diagram of the structure of this utility model; Figure 2 This is the front view of this utility model; Figure 3 yes Figure 2 Sectional view of AA; Figure 4 yes Figure 3 Enlarged view of point B in the middle; In the figure: 1. Cover; 2. Through hole; 3. First positioning step; 4. Second positioning step; 5. Spiral groove; 6. First groove; 7. Second groove; 8. Bolt hole; 9. Threaded hole; 11. Mounting part; 12. Positioning part. Detailed Implementation

[0019] The present invention will now be described in further detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, illustrating only the basic structure of the present invention, and therefore only show the components relevant to the present invention.

[0020] like Figure 1-4 As shown, this utility model discloses a flange cover for an explosion-proof electrical connector, including a cover body 1. The cover body 1 is composed of an integrally formed, coaxially connected mounting part 11 and a positioning part 12. The mounting part 11 is flat and has four evenly distributed bolt holes 8 for mounting and fixing the cover body 1. The positioning part 12 is cylindrical and is used for positioning the cover body 1. The mounting part 11 also has four evenly distributed threaded holes 9 for connecting and fixing the explosion-proof electrical connector.

[0021] The cover 1 is provided with an axially extending through hole 2 that passes through both ends. At one end of the mounting part 11, the through hole 2 is provided with a first positioning step 3 and a second positioning step 4 with decreasing diameters, both of which are used for the installation and positioning of the explosion-proof electrical connector.

[0022] The wall of the through hole 2 is provided with a spiral groove 5 arranged along the axial direction of the through hole 2 in a spiral shape; the spiral path of the spiral groove 5 can effectively block and delay the straight intrusion of external explosive gases, dust or moisture.

[0023] The helix angle of the spiral groove 5 is 15-45°. This setting ensures the extension of the medium flow path while avoiding processing difficulties or reduced sealing performance caused by excessive angle, thus balancing process feasibility and sealing effectiveness.

[0024] The spiral groove 5 has a semi-circular cross-section. The semi-circular cross-section is conducive to the formation of a stable flow state of the medium in the groove, reducing eddies and local pressure fluctuations, enhancing the dual functions of the spiral groove 5 in guiding and blocking, and improving dynamic sealing performance.

[0025] The spiral groove 5 has a depth that increases from the mounting part 11 to the other end. The spiral groove 5 is not for direct contact sealing but rather communicates with the external environment. When high-temperature, high-pressure gas is generated, this gas will attempt to leak outwards axially along the through-hole 2. The design of the groove depth increasing from the mounting part 11 to the other end creates an airflow channel with a gradually expanding cross-sectional area. When high-pressure gas enters the shallower groove root and flows towards the deeper groove opening, it undergoes a process of volume expansion and gradual pressure decay. This gradual pressure relief and damping effect effectively reduces the gas pressure and flow velocity, thereby significantly improving the dynamic sealing reliability and explosion-proof safety under sudden internal combustion and explosion conditions.

[0026] The first positioning step 3 has a first groove 6 arranged in an annular pattern at the connection between its step surface and the side surface, which is used to engage the sealing ring. Similarly, the second positioning step 4 has a second groove 7 arranged in an annular pattern at the connection between its step surface and the side surface, which is also used to engage the sealing ring. This achieves a double seal, ensuring that even if one sealing ring fails due to aging, wear, or localized deformation, the other sealing ring can still provide an effective seal, significantly reducing the risk of overall seal failure due to a single point of failure. Furthermore, the first positioning step 3 and the second positioning step 4 not only serve for the installation and positioning of explosion-proof electrical connectors but also classify and guide the interaction forces between components, avoiding stress concentration and resulting in more even stress distribution on the sealing ring. This allows for more stable sealing performance and extended service life under harsh conditions such as long-term vibration and thermal cycling.

[0027] The first groove 6 and the second groove 7 have the same structure, with the same depth of indentation on the stepped surface and side. This ensures that the sealing ring is subjected to uniform force within the groove, preventing deformation or damage to the sealing ring due to localized stress concentration, and improving sealing durability and installation stability.

[0028] The first groove 6 and the second groove 7 have a superior arc-shaped cross section. The superior arc-shaped cross section provides a larger sealing contact area and better elastic deformation space, which enhances the self-adaptability of the sealing ring under pressure fluctuations and improves the tightness and vibration resistance of the seal.

[0029] Projected axially onto the through hole 2, a portion of the inner region of the first groove 6 overlaps with a portion of the outer region of the second groove 7. This overlapping structure significantly extends and tortuouss the potential leakage path, thereby consuming the leakage energy of the medium at each stage, effectively preventing the intrusion of the medium, and achieving a superior sealing effect.

[0030] Compared with the prior art, the advantage of this embodiment is that the combined action of the first groove 6, the second groove 7 and the spiral groove 5 forms a composite sealing system of solid seal and labyrinth seal, which comprehensively improves the reliability of static seal.

[0031] Based on the above-described preferred embodiments of this utility model, and through the foregoing description, those skilled in the art can make various changes and modifications without departing from the technical concept of this utility model. The technical scope of this utility model is not limited to the contents of the specification, but must be determined according to the scope of the claims.

Claims

1. A flange cover for an explosion-proof electrical connector, comprising a cover body (1), one end of which is a mounting portion (11) fixedly connected to the explosion-proof electrical connector; the cover body (1) is provided with an axially extending through hole (2), and the end of the through hole (2) adjacent to the mounting portion (11) is provided with a first positioning step (3) and a second positioning step (4) connected sequentially and decreasing in diameter, for positioning the explosion-proof electrical connector, characterized in that: The wall of the through hole (2) is provided with a spiral groove (5) arranged in a spiral shape along the axial direction of the through hole (2); The first positioning step (3) has a first groove (6) arranged in an annular pattern at the connection between the step surface and the side surface. The first groove (6) is used to snap on the sealing ring. The second positioning step (4) has a second groove (7) arranged in an annular pattern at the connection between the step surface and the side surface. The second groove (7) is used to snap on the sealing ring.

2. The flange cover of an explosion-proof electrical connector according to claim 1, characterized in that: The first groove (6) and the second groove (7) have the same structure, and their recess depths on the step surface and the side surface are consistent.

3. The flange cover of an explosion-proof electrical connector according to claim 2, characterized in that: The cross-sections of the first groove (6) and the second groove (7) are curved.

4. The flange cover of an explosion-proof electrical connector according to claim 1, characterized in that: In the axial projection of the through hole (2), a portion of the inner region of the first groove (6) overlaps with a portion of the outer region of the second groove (7).

5. The flange cover of an explosion-proof electrical connector according to claim 1, characterized in that: The depth of the spiral groove (5) increases from the mounting part (11) to the other end.

6. The flange cover of an explosion-proof electrical connector according to claim 5, characterized in that: The spiral angle of the spiral groove (5) is 15-45°.

7. The flange cover of an explosion-proof electrical connector according to claim 1, characterized in that: The cross-section of the spiral groove (5) is semi-circular.

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