Explosion-proof wiring terminal structure

Abstract

The utility model discloses an explosion-proof wiring terminal structure. The explosion-proof wiring terminal structure comprises a mandrel, flame-retardant epoxy castable, a threaded sleeve, a gasket and a combined screw, the mandrel is installed in the middle of the inner side of the threaded sleeve, a gap between the mandrel and the threaded sleeve is uniform, flame-retardant epoxy castable is evenly filled between the mandrel and the threaded sleeve, the gasket is connected to the combined screw in a sleeving mode, and the combined screw is fixed to the left end of the mandrel through threads; the core shaft is made of metal with good conductivity, one end of the core shaft is provided with internal threads, the other end of the core shaft is arranged to be of a square sheet structure, the middle of the square sheet structure is provided with a round hole, and the left side of the core shaft is provided with a knurling structure. And the withstand voltage test of the mandrel on the threaded sleeve is greater than AC1000V / min, and the insulation resistance is greater than 100M omega / 500V.

Description

Technical Field

[0001] The utility model relates to the technical field of flameproof cavity electrical connection, in particular to a flameproof terminal structure. Background Art

[0002] The working principle of the flameproof terminal block is to isolate the internal circuit from the external environment through a solid explosion-proof shell. Even if an explosion occurs inside, it will not affect the external environment, thus achieving reliable electrical connection inside and outside the flameproof cavity.

[0003] Existing flameproof terminal blocks have the following defects:

[0004] Existing flameproof terminal blocks vary widely in structure, often resulting in low terminal connection strength, insufficient withstand voltage, and poor insulation resistance, leading to suboptimal electrical connections and compromising the explosion-proof performance of the entire flameproof cavity. Therefore, a solution is needed. Utility Model Content

[0005] (1) Technical problems solved

[0006] In view of the deficiencies in the prior art, the present invention provides a flameproof terminal structure to solve the problems raised in the above background technology.

[0007] (2) Technical solution

[0008] To achieve the above objectives, the present invention is implemented through the following technical solutions: a flameproof terminal structure, including a core shaft, a flame-retardant epoxy casting material, a screw sleeve, a washer and a combination screw; the core shaft is installed in the middle of the inner side of the screw sleeve, and the gap between the core shaft and the screw sleeve is uniform, the core shaft and the screw sleeve are evenly filled with flame-retardant epoxy casting material, the washer is sleeved on the combination screw, and the combination screw is fixed to the left end of the core shaft by a thread.

[0009] Preferably, the core shaft is made of metal with good conductivity, one end of the core shaft is provided with an internal thread, and the other end is provided with a square sheet structure, a circular hole is provided in the middle of the square sheet structure, and a knurled structure is provided on the left side of the core shaft.

[0010] Preferably, the screw sleeve is made of metal with a certain strength, an internal thread is provided on the inner side of the right end of the screw sleeve, an external thread is provided on the outer side of the right end of the screw sleeve, and a circular hole is opened on the left end of the screw sleeve.

[0011] Preferably, the flame retardant epoxy casting material is based on a composite low-viscosity epoxy resin.

[0012] (3) Beneficial effects

[0013] The utility model provides a flameproof terminal structure, which has the following beneficial effects:

[0014] This flameproof terminal block structure adopts a core shaft placed in the middle of the screw sleeve, and the gap between the core shaft and the screw sleeve is evenly filled with a flame-retardant epoxy castable with good flame retardancy and insulation properties. The knurled structure on the core shaft and the internal thread on the screw sleeve facilitate full contact between the flame-retardant epoxy castable, the core shaft and the screw sleeve, making the flameproof terminal block as a whole firm. In addition, the circular hole on the large end of the screw sleeve can be used for injecting flame-retardant epoxy castable and exhausting. This solves the problem of internal and external wiring of the flameproof cavity in electrical use, and makes the cavity have good flameproof performance. The pressure test of the core shaft to the screw sleeve is greater than AC 1000V / min, and the insulation resistance is greater than 100MΩ / 500V. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0016] Figure 2 This is a schematic structural diagram of the core shaft of the utility model;

[0017] Figure 3 It is a structural schematic diagram of the screw sleeve of the utility model.

[0018] In the figure, 1. core shaft; 2. flame-retardant epoxy castable; 3. screw sleeve; 4. washer; 5. combination screw; 6. internal thread; 7. square sheet structure; 8. round hole; 9. knurled structure; 10. external thread. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0020] See also Figure 1-3 , the embodiment of the utility model provides a technical solution: a flameproof terminal structure, characterized by comprising a core shaft 1, a flame retardant epoxy casting material 2, a screw sleeve 3, a washer 4 and a combination screw 5;

[0021] The core shaft 1 is installed in the middle of the inner side of the screw sleeve 3, and the gap between the core shaft 1 and the screw sleeve 3 is uniform, the core shaft 1 and the screw sleeve 3 are evenly filled with flame retardant epoxy castable 2, the washer 4 is sleeved on the combination screw 5, and the combination screw 5 is fixed to the left end of the core shaft 1 by a thread for electrical wiring, the core shaft 1 and the screw sleeve 3 are evenly filled with flame retardant epoxy castable 2, and are in full contact, so that the flameproof terminal block is firm as a whole.

[0022] Furthermore, the core shaft 1 is made of metal with good conductivity, one end of the core shaft 1 is provided with an internal thread 6, and the other end is provided with a square sheet structure 7, a circular hole 8 (for welding wire) is opened in the middle of the square sheet structure 7, and a knurled structure 9 is opened on the left side of the core shaft 1 (to facilitate firm contact between the core shaft 1 and the flame retardant epoxy castable 2).

[0023] Differently, the screw sleeve 3 is made of metal with a certain strength, and an internal thread 6 is provided on the inner side of the right end of the screw sleeve 3 to facilitate full contact with the flame retardant epoxy castable 5, and an external thread 10 is provided on the outer side of the right end of the screw sleeve 3 for connecting to the explosion-proof shell, and a circular hole 8 is opened on the left end of the screw sleeve 3 for injecting the flame retardant epoxy castable 2 and exhausting.

[0024] Effectively, the flame retardant epoxy castable 2 is based on a composite low-viscosity epoxy resin and has good mechanical, electrical and thermal properties, good flame retardancy, and high insulation strength. The pressure test of the core shaft to the screw sleeve is greater than AC 1000V / min, and the insulation resistance is greater than 100MΩ / 500V, which greatly improves the overall explosion-proof performance of the explosion-proof cavity.

[0025] Working principle: During operation, the flameproof terminal is screwed into the flameproof cavity through the external thread of the screw sleeve 3 and tightened. The core shaft 1 is provided with an internal thread 6, and a washer 4 and a combination screw 5 are installed in sequence at one end. When wiring, the wire is placed under the washer 4 and the combination screw 5 is tightened. The square sheet structure on the core shaft 1 is welded to one end for easy electrical connection. The flame-retardant epoxy castable 2 is evenly filled between the core shaft 1 and the screw sleeve 3, so that the core shaft 1 and the screw sleeve 3 have higher compressive strength and insulation resistance.

[0026] The components of the utility model, 1. core shaft; 2. flame retardant epoxy casting material; 3. screw sleeve; 4. washer; 5. combination screw; 6. internal thread; 7. square sheet structure; 8. round hole; 9. knurled structure; 10. external thread, are all universal standard parts or components known to technical personnel in this field, and their structures and principles can be known to technical personnel in this field through technical manuals or conventional experimental methods. The problem solved by the utility model is that there are many types of existing explosion-proof terminal structures, and the terminal connection strength is often low, the pressure resistance is insufficient, and the insulation resistance is poor, resulting in unsatisfactory electrical connection, thereby affecting the explosion-proof performance of the entire explosion-proof cavity. The utility model solves the problem of internal and external wiring of the explosion-proof cavity in electrical use through the mutual combination of the above-mentioned components, so that the cavity has good explosion-proof performance, and the pressure test of the core shaft to the screw sleeve is greater than AC 1000V / min, and the insulation resistance is greater than 100MΩ / 500V.

[0027] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all perspectives, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims be included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0028] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods that can be understood by those skilled in the art.

Claims

1. A flameproof terminal structure, characterized in that: It comprises a core shaft (1), a flame retardant epoxy casting material (2), a screw sleeve (3), a washer (4) and a combination screw (5); The core shaft (1) is installed in the middle of the inner side of the screw sleeve (3), and the gap between the core shaft (1) and the screw sleeve (3) is uniform. The core shaft (1) and the screw sleeve (3) are evenly filled with flame-retardant epoxy casting material (2). The washer (4) is sleeved on the combination screw (5), and the combination screw (5) is fixed to the left end of the core shaft (1) through a thread.

2. The flameproof terminal structure according to claim 1, characterized in that: The core shaft (1) is made of a metal with good electrical conductivity. One end of the core shaft (1) is provided with an internal thread (6), and the other end is provided with a square sheet structure (7). A circular hole (8) is provided in the middle of the square sheet structure (7). A knurled structure (9) is provided on the left side of the core shaft (1).

3. The flameproof terminal structure according to claim 1, characterized in that: The screw sleeve (3) is made of metal with a certain strength. An internal thread (6) is provided on the inner side of the right end of the screw sleeve (3), and an external thread (10) is provided on the outer side of the right end of the screw sleeve (3). A circular hole (8) is opened on the left end of the screw sleeve (3).

Images