Explosion-proof motor wire outlet structure

Abstract

A wire outlet structure of an explosion-proof motor comprises a metal explosion-proof wire outlet sleeve, a front-end wire outlet plate, a rear-end wire inlet cover, an explosion-proof insulator and the like, the distance between wire harnesses is positioned and restrained by using wire holes of the front-end wire outlet plate and the rear-end wire inlet cover and a wiring through hole of the explosion-proof insulator, the wire outlet rule is ensured, and the safety performance is improved; furthermore, the metal explosion-proof wire outlet sleeve is internally provided with an insulating wire protecting sleeve for protecting the wire harness, so that the wire harness is prevented from being scratched, the safety performance is improved, and the sealing performance is better after filling and sealing; the metal explosion-proof wire outlet sleeve only needs to be inserted into the wire outlet hole, one end is positioned through the annular step, the other end is fixed through the shaft check ring, maintenance and disassembly are convenient, the price is low, and economic benefits are better. And a double-sealing structure is adopted between the metal explosion-proof wire outlet sleeve and the front end cover of the motor, so that the sealing performance can be better ensured, and the conduction of explosion such as sparks in the motor can be more effectively isolated.

Description

Technical Field

[0001] The utility model relates to the field of explosion-proof motors, in particular to an explosion-proof motor outlet structure. Background Art

[0002] Explosion-proof electric actuators are widely used in inflammable and explosive hazardous places such as chemical industry, petroleum, metallurgy, and electric power. Explosion-proof motors can provide power sources for actuators. The power junction box of explosion-proof motors is in the sealed cavity formed by the actuator housing and the motor housing. At the same time, there are outlet holes in the motor to facilitate wiring, installation and maintenance. At present, the relevant standards do not make detailed provisions for the motor outlet structure. The existing motor outlet scheme does not have obvious installation position constraints on the relevant wiring harness, does not take into account the influence of electrical clearance and creepage distance, and the outlet mechanism has messy outlets and poor safety performance. Utility Model Content

[0003] The technical problem to be solved by the utility model is to provide an explosion-proof motor outlet structure with orderly outlets and high safety performance, in view of the defects of the prior art that the outlets of the wire harness are messy and have poor safety performance.

[0004] The utility model solves the technical problem by adopting the following technical solution: constructing an explosion-proof motor outlet structure, comprising a metal explosion-proof outlet sleeve, a front end outlet plate, a rear end outlet cover, and an explosion-proof insulator, wherein the metal explosion-proof outlet sleeve is detachably and sealedly assembled in an outlet hole of a side wall of a front end cover of the motor, the rear end outlet cover is arranged in the rear end of the metal explosion-proof outlet sleeve and faces a motor cavity on the inner side of the front end cover of the motor, the front end outlet plate is arranged in the front end of the metal explosion-proof outlet sleeve, and a plurality of motor leads of the motor cavity on the inner side of the front end cover of the motor pass through the rear end outlet cover and the front end outlet plate and then are led out to the outer side of the front end cover of the motor;

[0005] A plurality of wire holes are arranged on the front end outlet plate and the rear end outlet cover, and the wire holes are spaced apart according to the electrical clearance requirements of the motor leads. The wire holes of the front end outlet plate and the rear end outlet cover are arranged front to back so that the plurality of motor leads are arranged side by side and spaced apart along the axial direction of the metal explosion-proof outlet sleeve between the front end outlet plate and the rear end outlet cover. The explosion-proof insulator is a structure formed by potting glue between the front end outlet plate and the rear end outlet cover after the plurality of motor leads are parallelly led out from the front end outlet plate side by side. The explosion-proof insulator has wiring through holes front to back facing the wire holes of the front end outlet plate and the rear end outlet cover so as to maintain the side-by-side spacing state of the plurality of motor leads.

[0006] Furthermore, the explosion-proof motor outlet structure described in the utility model also includes an insulating wire sheath, which is sleeved inside the metal explosion-proof outlet sheath and located between the front end cover of the motor and the rear end incoming wire cover, and the motor leads pass through the insulating wire sheath. The explosion-proof insulator is a structure formed by potting glue between the front end outlet board and the rear end incoming wire cover and inside the insulating wire sheath after a plurality of the motor leads are led out in parallel and side by side.

[0007] Furthermore, in the explosion-proof motor outlet structure described in the utility model, the insulating wire sheath is a rubber part or a plastic part.

[0008] Furthermore, in the explosion-proof motor lead-out structure described in the utility model, the outer peripheral wall of the rear end of the metal explosion-proof lead-out sleeve extends in the radial direction to form an annular step, and the annular step abuts against the inner side of the front end cover of the motor to achieve axial positioning of the metal explosion-proof lead-out sleeve; an annular groove is provided on the outer peripheral wall of the front end of the metal explosion-proof lead-out sleeve, and a shaft retaining ring is clamped in the annular groove and blocked by the outer side of the front end cover of the motor to achieve axial fixation of the metal explosion-proof lead-out sleeve.

[0009] Furthermore, in the explosion-proof motor lead-out structure described in the utility model, the shaft retaining ring is elastic.

[0010] Furthermore, in the explosion-proof motor outlet structure described in the utility model, a circle of first sealing grooves is arranged around the outer peripheral wall of the front end of the metal explosion-proof outlet sleeve, and a circle of second sealing grooves is arranged around the outer peripheral wall of the rear end of the metal explosion-proof outlet sleeve.

[0011] A first sealing ring is arranged in the first sealing groove, a second sealing ring is arranged in the second sealing groove, and the metal explosion-proof outlet sleeve is sealed with the outlet hole through the first sealing ring and the second sealing ring.

[0012] Furthermore, in the explosion-proof motor outlet structure described in the utility model, the inner side wall of the front end of the metal explosion-proof outlet sleeve is provided with a step that abuts against the front end outlet plate to position the front end outlet plate, and the rear end incoming wire cover is tightly buckled in the rear end of the metal explosion-proof outlet sleeve by interference fit.

[0013] Furthermore, in the explosion-proof motor outlet structure described in the utility model, the explosion-proof insulator is potted with epoxy resin material.

[0014] Furthermore, in the explosion-proof motor outlet structure described in the utility model, the front end outlet plate and the rear end inlet cover are disc-shaped structures made of polytetrafluoroethylene material.

[0015] Furthermore, in the explosion-proof motor lead-out structure described in the utility model, the diameters of the wire holes of the front-end lead-out plate and the rear-end lead-in cover match the wire diameters of the motor leads passing through the wire holes.

[0016] The explosion-proof motor outlet structure of the present invention has the following beneficial effects: the present invention utilizes the wire holes of the front-end outlet plate and the rear-end incoming cover and the wiring through holes of the explosion-proof insulator to position and constrain the distance between the wire harnesses, thereby ensuring the outlet rules and improving their safety performance; further, an insulating wire protection sleeve is provided in the metal explosion-proof outlet sleeve to protect the wire harness, thereby avoiding scratches, improving safety performance, and having better sealing performance after potting; the metal explosion-proof outlet sleeve only needs to be inserted into the outlet hole, one end is positioned by an annular step, and the other end is fixed by a shaft retaining ring, which is convenient for maintenance and disassembly, and is low in price and has better economic benefits; a double sealing structure is adopted between the metal explosion-proof outlet sleeve and the front end cover of the motor, which can better ensure the sealing performance and more effectively isolate the conduction of explosions such as sparks if they occur inside the motor. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art are briefly introduced below. Obviously, the drawings in the following description are only embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the provided drawings without creative work:

[0018] Figure 1 This is a schematic diagram of the structure of the outlet structure of the explosion-proof motor of the utility model;

[0019] Figure 2 It is a structural diagram of the front-end outlet board. DETAILED DESCRIPTION

[0020] In order to facilitate the understanding of the present invention, the present invention will be described more comprehensively with reference to the relevant drawings below. Typical embodiments of the present invention are given in the drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present invention more thorough and comprehensive. It should be understood that the embodiments of the present invention and the specific features in the embodiments are detailed descriptions of the technical solutions of the present application, rather than limitations on the technical solutions of the present application. In the absence of conflict, the embodiments of the present invention and the technical features in the embodiments can be combined with each other.

[0021] refer to Figure 1 The explosion-proof motor outlet structure of this embodiment includes a metal explosion-proof outlet sleeve 3, a front end outlet plate 5, a rear end inlet cover 8, an explosion-proof insulator, an insulating wire sleeve 6, a shaft retaining ring 2, a first sealing ring 7 and a second sealing ring 9.

[0022] The metal flameproof outlet sleeve 3 is detachably sealed and assembled in the outlet hole of the side wall of the motor front end cover 1. Specifically, the inner side of the motor front end cover 1 is the motor cavity, and the side wall of the motor front end cover 1 is provided with an outlet hole, and the motor lead 4 in the motor cavity needs to be led out from the outlet hole to the outside of the motor front end cover 1. Figure 1 In the figure, the wiring harness on the left is the connection end between the motor lead 4 and the actuator terminal strip, and the right side is the motor cavity. The metal explosion-proof outlet sleeve 3 is inserted into this outlet hole. The metal explosion-proof outlet sleeve 3 is a roughly cylindrical structure, with its front and rear ends unobstructed and hollow inside. Here, the front end of the metal explosion-proof outlet sleeve 3 is the end close to the outside of the motor front end cover 1, and the rear end of the metal explosion-proof outlet sleeve 3 is the end facing the motor cavity. The official explosion-proof standard (such as the national standard) is used to design a suitable gap and assembly length between the metal explosion-proof outlet sleeve 3 and the motor front end cover 1, that is, the length and outer diameter of the metal explosion-proof outlet sleeve 3 meet the official explosion-proof standard.

[0023] In this embodiment, the metal explosion-proof outlet sleeve 3 is inserted into the outlet hole of the motor front end cover 1 from the inner side of the motor front end cover 1, and then the shaft retaining ring 2 is installed on the outer side of the motor front end cover 1 to fix it. Specifically, the outer peripheral wall of the rear end of the metal explosion-proof outlet sleeve 3 extends in the radial direction to form an annular step, and the annular step abuts against the inner side of the motor front end cover 1 to achieve the axial positioning of the metal explosion-proof outlet sleeve 3. The outer peripheral wall of the front end of the metal explosion-proof outlet sleeve 3 is provided with an annular groove, and the shaft retaining ring 2 is a circular ring structure. The shaft retaining ring 2 is inserted into the annular groove and blocked by the outer side of the motor front end cover 1 to achieve the axial fixation of the metal explosion-proof outlet sleeve 3. Among them, the shaft retaining ring 2 is elastic and can be conveniently clamped in the annular groove, which is convenient for maintenance and disassembly, and is low in price and has better economic benefits.

[0024] In order to improve the sealing reliability, this embodiment adopts a double sealing structure between the metal flameproof outlet sleeve and the front end cover of the motor. Specifically, the outer peripheral wall of the front end of the metal flameproof outlet sleeve 3 is surrounded by a circle of first sealing grooves, and the outer peripheral wall of the rear end of the metal flameproof outlet sleeve 3 is surrounded by a circle of second sealing grooves. The first sealing ring 7 is arranged in the first sealing groove, and the second sealing ring 9 is arranged in the second sealing groove. The first sealing ring 7 and the second sealing ring 9 are both O-type rubber sealing rings. The metal flameproof outlet sleeve 3 is sealed with the outlet hole through the first sealing ring 7 and the second sealing ring 9. Compared with a single seal, this can better ensure the sealing performance and more effectively isolate the conduction of explosions such as sparks inside the motor.

[0025] Wherein, the front-end outlet plate 5 and the rear-end inlet cover 8 are both disc-shaped structures made of polytetrafluoroethylene material, and the radial dimension matches the inner diameter dimension of the metal flameproof outlet sleeve 3. The insulating wire sheath 6 is a cylindrical sleeve with a certain wall thickness, and the insulating wire sheath 6 is a rubber or plastic part, and its outer diameter dimension matches the inner diameter dimension of the metal flameproof outlet sleeve 3. The rear-end inlet cover 8 is arranged in the rear end of the metal flameproof outlet sleeve 3 and faces the motor cavity inside the front end cover 1 of the motor, the front-end outlet plate 5 is arranged in the front end of the metal flameproof outlet sleeve 3, the insulating wire sheath 6 is sleeved in the metal flameproof outlet sleeve 3, and the insulating wire sheath 6 is located between the front end cover 1 of the motor and the rear-end inlet cover 8 and is clamped from the front and rear ends by the front end cover 1 of the motor and the rear-end inlet cover 8. The multiple motor leads 4 in the motor cavity inside the front end cover 1 of the motor pass through the rear end wire inlet cover 8, the insulating wire sheath 6, and the front end wire outlet plate 5 from back to front (i.e., from right to left in the figure) in sequence and are then led out to the outside of the front end cover 1 of the motor.

[0026] Among them, the inner side wall of the front end of the metal explosion-proof outlet sleeve 3 is provided with an annular step that abuts against the front end outlet plate 5 to position the front end outlet plate 5, and the rear end inlet cover 8 is tightly buckled in the rear end of the metal explosion-proof outlet sleeve 3 by interference fit. For example, the front edge of the rear end inlet cover 8 can be slightly reduced in diameter to form a circle of annular steps, and at the same time, the inner side wall of the rear end of the metal explosion-proof outlet sleeve 3 can be slightly expanded in diameter to form a circle of annular steps, and the rear end inlet cover 8 is buckled onto the annular step of the metal explosion-proof outlet sleeve 3 through the annular step. During assembly, the front end outlet plate 5 is first inserted into the metal explosion-proof outlet sleeve 3 from the rear end of the metal explosion-proof outlet sleeve 3 until it abuts against the step inside the front end, and then the insulating wire sheath 6 is inserted until it abuts against the front end outlet plate 5, and then the rear end inlet cover 8 is inserted, and the annular step of the rear end inlet cover 8 is buckled into the annular step of the inner side wall of the rear end of the metal explosion-proof outlet sleeve 3.

[0027] In order to make the motor leads 4 passing through the metal flameproof outlet sleeve 3 regular and orderly, and meet the requirements of electrical clearance and creepage distance, the front outlet plate 5 and the rear inlet cover 8 are provided with a plurality of wire holes, such as Figure 2As shown. The diameter of the wire holes of the front-end outlet plate 5 and the rear-end inlet cover 8 matches the wire diameter of the motor lead 4 passing through the wire holes. The wire holes of the front-end outlet plate 5 and the rear-end inlet cover 8 are spaced according to the electrical clearance requirements of the motor lead 4, that is, the spacing between the wire holes meets the electrical clearance requirements of the motor lead 4. When installing the front-end outlet plate 5 and the rear-end inlet cover 8, adjust the position so that the wire holes of the front-end outlet plate 5 and the rear-end inlet cover 8 are arranged front and back, so that multiple motor leads 4 are arranged side by side and spaced along the axial direction of the metal explosion-proof outlet sleeve 3 between the front-end outlet plate 5 and the rear-end inlet cover 8. The explosion-proof insulator is a structure formed by pouring glue (specifically epoxy resin material) between the front-end outlet plate 5 and the rear-end inlet cover 8 and in the insulating sheath 6 after multiple motor leads 4 are parallelly led out from the rear-end inlet cover 8, the insulating sheath 6, and the front-end outlet plate 5. Therefore, the explosion-proof insulator has a wiring through hole that is directly opposite to the wire holes of the front-end outlet plate 5 and the rear-end inlet cover 8, so that the parallel spacing state of the plurality of motor leads 4 can be maintained. In this way, the front-end outlet plate 5 and the rear-end inlet cover 8 constrain the distance between the wire harnesses, ensure the regularity of the outlets, and improve their safety performance; at the same time, the metal explosion-proof outlet sleeve 3 has a rubber insulating wire sleeve to protect the wire harness, avoid scratches, improve safety performance, and better seal performance after potting.

[0028] In summary, the outlet mechanism of the embodiment of the utility model has a simple structure and a small number of processed parts; the front end outlet plate 5 and the rear end inlet cover 8 are made of polytetrafluoroethylene circular plates, and holes are opened for passing the wires according to the diameter of the outlet wire harness. During potting, the wire harness passes through the rear end inlet cover 8, the insulating wire sheath 6, and the front end outlet plate 5 in sequence, fully considering the influence of the electrical clearance and the creepage distance to ensure that the outlet is regular and orderly; two O-type rubber sealing rings 7 and 9 are used between the metal explosion-proof outlet sheath 3 and the front end cover 1 of the motor to realize a double sealing structure, which fully guarantees the sealing performance; the rubber insulating wire sheath 6 is used to protect the cable and has good insulation to avoid scratches on the cable; during installation, the potted outlet structural components are directly passed through the outlet hole on the front end cover 1 of the motor, one end is positioned using the annular step of the front end cover 1 of the motor, and the other end is fixed with an elastic shaft retaining ring 2, which is convenient for installation and disassembly.

[0029] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be an element in the middle. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be an element in the middle. The terms "inside", "outside", "left", "right" and similar expressions used herein are for illustrative purposes only.

[0030] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present invention. The terms used herein in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0031] Terms including ordinal numbers such as "first" and "second" used in this specification may be used to describe various components, but these components are not limited by these terms. The purpose of using these terms is only to distinguish one component from other components. For example, without departing from the scope of the present invention, the first component may be named as the second component, and similarly, the second component may also be named as the first component.

[0032] The embodiments of the utility model are described above in conjunction with the accompanying drawings, but the utility model is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the enlightenment of the utility model, ordinary technicians in this field can also make many forms without departing from the scope of protection of the utility model and the claims, which all fall within the protection of the utility model.

Claims

1. An explosion-proof motor outlet structure, characterized in that: The invention comprises a metal flameproof outlet sleeve (3), a front end outlet plate (5), a rear end inlet cover (8), and a flameproof insulator. The metal flameproof outlet sleeve (3) is detachably sealed and assembled in an outlet hole on the side wall of a motor front end cover (1). The rear end inlet cover (8) is arranged in the rear end of the metal flameproof outlet sleeve (3) and faces the motor cavity inside the motor front end cover (1). The front end outlet plate (5) is arranged in the front end of the metal flameproof outlet sleeve (3). A plurality of motor leads (4) in the motor cavity inside the motor front end cover (1) pass through the rear end inlet cover (8) and the front end outlet plate (5) and are then led out to the outside of the motor front end cover (1). A plurality of wire holes are arranged on the front end outlet plate (5) and the rear end inlet cover (8), and the wire holes are spaced apart according to the electrical clearance requirements of the motor leads (4). The wire holes of the front end outlet plate (5) and the rear end inlet cover (8) are arranged front and rear to face each other so that the plurality of motor leads (4) are arranged side by side and spaced apart along the axial direction of the metal flameproof outlet sleeve (3) between the front end outlet plate (5) and the rear end inlet cover (8). The explosion-proof insulator is a structure formed by potting glue between the front end outlet plate (5) and the rear end inlet cover (8) after the plurality of motor leads (4) are parallelly led out from the front end outlet plate (5) side by side. The explosion-proof insulator has a wiring through hole front and rear to face the wire holes of the front end outlet plate (5) and the rear end inlet cover (8) so as to maintain the side-by-side spacing state of the plurality of motor leads (4).

2. The explosion-proof motor outlet structure according to claim 1, characterized in that: The invention also comprises an insulating wire sheath (6), wherein the insulating wire sheath (6) is sheathed in the metal flameproof outlet sheath (3) and is located between the front end cover (1) of the motor and the rear end inlet cover (8), and the motor lead wire (4) passes through the insulating wire sheath (6). The flameproof insulator is a structure formed by potting glue between the front end outlet board (5) and the rear end inlet cover (8) and in the insulating wire sheath (6) after a plurality of motor lead wires (4) are led out in parallel.

3. The explosion-proof motor outlet structure according to claim 2, characterized in that: The insulating wire sheath (6) is a rubber part or a plastic part.

4. The explosion-proof motor outlet structure according to claim 1, characterized in that: The outer peripheral wall at the rear end of the metal flameproof outlet sleeve (3) extends in the radial direction to form an annular step, and the annular step abuts against the inner side of the motor front end cover (1) to achieve axial positioning of the metal flameproof outlet sleeve (3); the outer peripheral wall at the front end of the metal flameproof outlet sleeve (3) is provided with an annular groove, and a shaft retaining ring (2) is inserted into the annular groove and is blocked by the outer side of the motor front end cover (1) to achieve axial fixation of the metal flameproof outlet sleeve (3).

5. The explosion-proof motor outlet structure according to claim 4, characterized in that: The shaft retaining ring (2) is elastic.

6. The explosion-proof motor outlet structure according to claim 1, characterized in that: The outer peripheral wall of the front end of the metal flameproof outlet sleeve (3) is surrounded by a first sealing groove, and the outer peripheral wall of the rear end of the metal flameproof outlet sleeve (3) is surrounded by a second sealing groove. A first sealing ring (7) is arranged in the first sealing groove, a second sealing ring (9) is arranged in the second sealing groove, and the metal flameproof outlet sleeve (3) is sealed with the outlet hole through the first sealing ring (7) and the second sealing ring (9).

7. The explosion-proof motor outlet structure according to claim 1, characterized in that: The inner side wall of the front end of the metal flameproof outlet sleeve (3) is provided with a step that abuts against the front end outlet plate (5) to position the front end outlet plate (5), and the rear end inlet cover (8) is tightly buckled in the rear end of the metal flameproof outlet sleeve (3) by means of interference fit.

8. The explosion-proof motor outlet structure according to claim 1, characterized in that: The explosion-proof insulator is potted with epoxy resin material.

9. The explosion-proof motor outlet structure according to claim 1, characterized in that: The front end outlet plate (5) and the rear end inlet cover (8) are disc-shaped structures made of polytetrafluoroethylene material.

10. The explosion-proof motor outlet structure according to claim 1, characterized in that: The diameters of the wire holes of the front-end wire outlet plate (5) and the rear-end wire inlet cover (8) match the wire diameters of the motor leads (4) passing through the wire holes.

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