CN107317424A - A kind of high pressure composite anti-explosion type threephase asynchronous - Google Patents

Abstract

The invention discloses a high-voltage composite explosion-proof three-phase asynchronous motor, which includes a machine base, a rotating shaft and an end cover. The joint between the end cover and the rotating shaft is provided with an explosion-proof structure to prevent combustible dust from entering the bearing chamber or the inside of the motor. The explosion-proof structure includes a labyrinth sealing sleeve fixedly sleeved on the rotating shaft. The labyrinth sealing sleeve is located outside the motor and coaxially arranged with the rotating shaft. The labyrinth sealing sleeve is composed of a radial retaining ring and an axial cylinder. The inner ring of the ring is sealed and fixedly connected with the rotating shaft, and the outer ring of the stop ring is sealed and fixedly connected with the outer end of the cylinder. The inner end of the cylinder extends axially to the corresponding end cover and is partially inserted into the end cover. The corresponding part of the cover and the cylinder is provided with a seal groove, and the inner end of the cylinder is inserted into the corresponding seal groove and fits with the gap. The invention adds dust explosion-proof measures on the basis of the gas explosion-proof motor, thereby simultaneously satisfying the dust explosion-proof and gas explosion-proof.

Description

A high-voltage composite explosion-proof three-phase asynchronous motor

technical field

The invention relates to a motor used in combustible dust and explosive gas environments, in particular to a high-voltage compound explosion-proof three-phase asynchronous motor.

Background technique

With the improvement of safety production requirements in coal, petroleum, chemical, steel and other industries, the explosion-proof requirements for equipment are also further enhanced. There are more and more occasions with high composite explosion-proof requirements (A21 area IIC or A22 area IIC), and there is an increasing demand for equipment that can operate safely in such an environment with high explosion-proof requirements. In this situation, there is an urgent need to improve the clearance design of the parts of the original motor and develop a composite explosion-proof motor.

There is no effective design in the existing motor products that can meet the requirements of compound explosion-proof, and the industry uses motors that meet the requirements of IIC gas explosion-proof to replace them. The gap design of the alternative motor cannot meet the dust explosion-proof requirements and has no dust-proof effect, especially at the bearing positions at both ends of the motor (mainly the shaft penetration part), without any dust explosion-proof measures, which poses a greater safety hazard.

The patent application with the application number CN201110258159.X discloses a high-voltage explosion-proof three-phase asynchronous motor, including a base cylinder, a front end cover, a rear end cover, a rotating shaft and a support, and a high-voltage The junction box support and the auxiliary junction box support are respectively provided with a bearing inner cover and a matching meandering ring on the inner side of the joint between the rotating shaft and the front end cover and the rear end cover, and the two form a meandering flameproof joint surface structure, the joint between the end ring of the base cylinder and the seam of the end cover is a plane explosion-proof structure, the explosion-proof length is 28-32mm, and the explosion-proof gap is 0.05-0.07mm. The present invention has positive and beneficial effects: it can withstand the hydraulic (explosion) pressure of 2.0Mpa; there are few flameproof joint surfaces, and the indispensable flameproof joint surfaces must meet the strict explosion-proof gap requirements; it can be safely and reliably applied to Chemical sites containing gases with huge explosive energy such as hydrogen and acetylene. However, it still has no dust explosion-proof measures, which poses a great potential safety hazard.

Contents of the invention

In order to solve the problems in the prior art, the present invention provides a high-voltage compound explosion-proof three-phase asynchronous motor, and dust explosion-proof measures are added on the basis of the gas explosion-proof motor, so as to satisfy both dust explosion-proof and gas explosion-proof.

In order to solve the above technical problems, the present invention adopts the following technical scheme: a high-voltage composite explosion-proof three-phase asynchronous motor, including a base and a rotating shaft, and end covers are respectively provided at the front and rear ends of the base, and the ends of the end cover and the rotating shaft The joint is equipped with a flame-proof structure to prevent combustible dust from entering the bearing chamber or the inside of the motor. The flame-proof structure includes a labyrinth seal sleeve fixedly sleeved on the shaft. The labyrinth seal sleeve is located outside the motor and coaxially arranged with the shaft. The labyrinth seal sleeve is composed of a radial retaining ring and an axial cylinder. The inner ring of the retaining ring is sealed and fixedly connected with the rotating shaft, the outer ring of the retaining ring is sealed and fixedly connected with the outer end of the cylinder, and the inner end of the cylinder The part extends axially to the corresponding end cap and is partially inserted into the end cap. There is a sealing groove on the corresponding part of the end cap and the cylinder, and the inner end of the cylinder is inserted into the corresponding sealing groove and fits with it. .

The sum of the bilateral gaps between the inner circumference and the outer circumference of the cylinder and the corresponding sealing groove is 0.05-0.1 mm.

It also includes a junction box, the junction box is installed at the outlet of the machine base, and the joint between the junction box and the machine base and the joint between the end cover and the machine base are provided with a root sealing structure. There is an annular mounting groove provided at the matching place of the machine base and the matching place of the end cover and the machine base, and a sealing ring is arranged in the annular installing groove.

The cross section of the annular installation groove is square.

The labyrinth sealing sleeve is made of copper.

The beneficial effects of the present invention are:

1. In the present invention, the joint between the end cover and the rotating shaft is equipped with an explosion-proof structure to prevent combustible dust from entering the bearing chamber or the inside of the motor, so that dust explosion-proof measures can be added at the bearing positions (mainly the shaft penetration part) at both ends of the motor, which can Effectively prevent combustible dust from entering the bearing chamber and the inside of the motor, realize the closed protection of the bearing, and meet the dust explosion-proof requirements.

2. In the present invention, the joints between the junction box and the machine base and the joints between the end cover and the machine base are all equipped with a root sealing structure, and the joints between the junction box and the machine base and the joints between the end cover and the machine base are added. Dust explosion-proof measures to achieve dust explosion-proof protection.

3. The present invention adds dust explosion-proof measures on the basis of gas explosion-proof motors, so as to satisfy both dust explosion-proof and gas explosion-proof. The motor can be applied to explosion-proof places with gas and dust level requirements.

Description of drawings

Fig. 1 is the front view of the present invention;

Fig. 2 is a side view of the present invention;

Fig. 3 is an enlarged view of place A in Fig. 1;

Fig. 4 is the enlarged view of place B in Fig. 1;

Figure 5 is an enlarged view at C in Figure 1;

Figure 6 is an enlarged view at D in Figure 1;

Fig. 7 is an enlarged view at E in Fig. 2 .

detailed description

As shown in Figures 1 to 7, a high-voltage composite explosion-proof three-phase asynchronous motor of the present invention includes a base 2 and a rotating shaft 1, and end covers 3 are respectively provided at the front and rear ends of the base 2, and the end covers 3 The joint with the shaft 1 is equipped with a flameproof structure to prevent combustible dust from entering the bearing chamber or the inside of the motor. The flameproof structure includes a labyrinth seal sleeve 4 fixedly sleeved on the rotor shaft 1, and the labyrinth seal sleeve 4 is located outside the motor. It is arranged coaxially with the rotating shaft 1, and the labyrinth sealing sleeve 4 is composed of a radial retaining ring and an axial cylinder. The inner ring of the retaining ring is sealed and fixedly connected with the rotating shaft 1. The ends are sealed and fixedly connected. The inner end of the cylinder extends axially to the corresponding end cap 3 and is partially inserted into the end cap 3. A sealing groove 7 is opened on the end cap 3 and the corresponding part of the cylinder. The inner end of the cylinder is inserted into the corresponding sealing groove 7 and fits with the clearance, and the sum of the bilateral gaps between the inner and outer circumference of the cylinder and the corresponding sealing groove 7 is 0.05-0.1mm.

The design of the above-mentioned explosion-proof junction realizes the addition of dust explosion-proof measures at the bearing positions at both ends of the motor (mainly the shaft penetration part), which can effectively prevent combustible dust from entering the bearing chamber and the inside of the motor, realize the closed protection of the bearing, and meet the dust explosion-proof requirements. Require.

The present invention also includes a junction box 6, the junction box 6 is installed at the outlet of the machine base, and the joints between the junction box 6 and the machine base 2 and the joints between the end cover 3 and the machine base 2 are all provided with a root sealing structure, and the root seal The structure includes ring-shaped installation grooves respectively provided at the joints of the junction box 6 and the machine base 2 and the joints of the end cover 3 and the machine base 2, and sealing rings 5 are provided in the ring-shaped installation grooves.

The design of the above-mentioned root sealing structure realizes the addition of dust explosion-proof measures at the joint between the junction box 6 and the machine base 2 and the joint between the end cover 3 and the machine base 5 to achieve dust explosion-proof protection.

In this embodiment, the cross section of the annular installation groove is square.

In this embodiment, the labyrinth sealing sleeve 4 is made of copper.

The high-voltage composite explosion-proof three-phase asynchronous motor in this embodiment is derived from the YB3-450 ExdIICT4Gb motor. The motor is equipped with dust explosion-proof measures on the basis of the gas explosion-proof motor, so as to meet the dust explosion-proof and gas explosion-proof requirements at the same time, and meet IIC Explosion-proof and ExtD A21 IP65 T130℃ dust explosion-proof requirements, the motor can be applied to explosion-proof places that require gas and dust levels (ExdIICT4 Gb/ExtDA21IP65 T130℃ explosion-proof level), such as petroleum, chemical, and coal production.

The above embodiments are only used to illustrate and not limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that the present invention can still be modified or equivalently replaced without departing from it. Any modifications or partial replacements within the spirit and scope of the present invention shall fall within the scope of the claims of the present invention.

Claims (5)

1. A high-voltage composite explosion-proof three-phase asynchronous motor, including a base and a rotating shaft, and end covers are respectively provided at the front and rear ends of the base, and it is characterized in that: the fittings of the end cover and the rotating shaft are provided with anti-flammability The dust enters the bearing chamber or the explosion-proof structure inside the motor. The flame-proof structure includes a labyrinth seal sleeve fixedly sleeved on the shaft. The labyrinth seal sleeve is located outside the motor and coaxially arranged with the shaft. The inner ring of the retaining ring is sealed and fixedly connected with the rotating shaft, the outer ring of the retaining ring is sealed and fixedly connected with the outer end of the cylinder, and the inner end of the cylinder is aligned with the corresponding end in the axial direction. The cover extends and is partially inserted into the end cover. A sealing groove is formed on the corresponding part of the end cover and the cylinder, and the inner end of the cylinder is inserted into the corresponding sealing groove and fits with it. 2. The high-voltage compound explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: the sum of the bilateral gaps between the inner and outer circumferences of the cylinder and the corresponding sealing groove is 0.05-0.1 mm. 3. The high-voltage composite explosion-proof three-phase asynchronous motor according to claim 1 or 2, characterized in that: it also includes a junction box, the junction box is installed at the outlet of the machine base, and the joint between the junction box and the machine base and The joint between the end cover and the machine base is provided with a root sealing structure. The root sealing structure includes ring-shaped installation grooves respectively set at the joint between the junction box and the machine base and the joint between the end cover and the machine base. A sealing ring is provided. 4. The high-voltage composite explosion-proof three-phase asynchronous motor according to claim 3, characterized in that: the cross section of the annular mounting groove is square. 5. The high-voltage composite explosion-proof three-phase asynchronous motor according to claim 1, characterized in that: the labyrinth sealing sleeve is made of copper.