CN207082944U - A compound explosion-proof three-phase asynchronous motor - Google Patents

Abstract

The utility model discloses a kind of composite anti-explosion type threephase asynchronous, it includes support, stator in support and the rotor with stator gap cooperation installation, rotor is fixedly mounted in rotating shaft, end cap is correspondingly provided with respectively in the front and back end of support, bearing is equipped between end cap and rotating shaft, and bearing internal external side is correspondingly provided with internal bearing cover and bearing end cover respectively, the bearing end cover is with being provided with the explosion separation structure for preventing combustible dust from entering bearing chamber or motor internal at rotating shaft cooperation, explosion separation structure includes being set in rotating shaft and with the oil sealing of rotating shaft interference fit and positioned at oil sealing inner side and the first flameproof joint formed at bearing end cover and rotating shaft cooperation；The second flameproof joint is respectively formed at the cooperation of internal bearing cover and support and at the cooperation of end cap and support；The 3rd flameproof joint is formed at the cooperation of internal bearing cover and rotating shaft.Blast resistance construction reliability of the present utility model is high, while meets that dust explosion protection and gas are explosion-proof, ensures equipment safety operation.

Description

A compound explosion-proof three-phase asynchronous motor

technical field

The utility model relates to a high-efficiency motor for combustible dust and explosive gas environments, in particular to a compound explosion-proof three-phase asynchronous motor.

Background technique

With the improvement of the international community's awareness of green economy and low-carbon economy, countries are vigorously promoting the use of high-efficiency motors. On May 31, 2010, my country's Ministry of Finance and Development and Reform Commission announced the "Implementation Rules for the Promotion of High-Efficiency Motor Products". The introduction of this policy has played a role in promoting the promotion of high-efficiency and high-voltage three-phase asynchronous motors in my country.

YBFBX series high-efficiency composite explosion-proof three-phase asynchronous motors (hereinafter referred to as: YBFBX series motors), are suitable for factory temperature groups T1~T4, where explosive gas and combustible dust mixture coexist. It can effectively solve the explosive hazardous places where explosive gas and combustible dust mixture coexist in current direct liquefaction projects, coal liquefaction units and coal-to-hydrogen units. The traditional composite explosion-proof motor has low efficiency, and the shaft penetration part is sealed with a skeleton oil seal To achieve the purpose of preventing dust from entering the interior of the motor, the long-term use of the skeleton oil seal will lose its protective performance due to the wear and tear caused by the high-speed operation of the motor, resulting in the failure of the dust explosion-proof performance and seriously affecting the safety of the equipment.

Therefore, it is urgent to design a new composite explosion-proof three-phase asynchronous motor to solve the problem of low reliability of the explosion-proof structure of the traditional composite explosion-proof motor and seriously affect the safety of equipment.

Utility model content

In order to solve the problems in the prior art, the utility model provides a compound explosion-proof three-phase asynchronous motor with high reliability of the explosion-proof structure.

In order to solve the above technical problems, the utility model adopts the following technical scheme: a composite explosion-proof three-phase asynchronous motor, which includes a frame, a stator installed in the frame, and a rotor installed in a gap with the stator, and the rotor is fixedly installed on the shaft Above, the front and rear ends of the machine base are respectively provided with end covers, bearings are provided between the end covers and the rotating shaft, and the inner and outer sides of the bearings are respectively provided with bearing inner covers and bearing outer covers, and the bearing outer covers cooperate with the rotating shaft There is a flameproof structure to prevent combustible dust from entering the bearing chamber or the inside of the motor. The flameproof structure includes an oil seal that is sleeved on the rotating shaft and has an interference fit with the rotating shaft, and is located inside the oil seal and formed at the joint between the bearing cover and the rotating shaft. The first flameproof joint surface, the oil seal is fixedly connected with the bearing outer cover, the bearing outer cover at the first flameproof joint surface is closely matched with the rotating shaft, and the axial length of the first flameproof joint surface is greater than or equal to 17mm, the first flameproof joint surface The radial clearance of the joint surface is less than or equal to 0.314mm;

The joint between the bearing inner cover and the machine base and the joint between the end cover and the machine base form a second flameproof joint surface, which is composed of a clearance fit section close to the inside of the motor and a tight fit section close to the outside of the motor , the bearing inner cover at the clearance fit section and the machine base and the end cover and the machine base are all clearance fit, the bearing inner cover and the machine base at the tight fit section and the end cover and the machine base are all tightly fitted, and the second flameproof The axial length of the joint surface is greater than or equal to 25mm, and the radial clearance of the second flameproof joint surface is less than or equal to 0.1mm;

The joint between the bearing inner cover and the rotating shaft forms a third flameproof joint surface, and the bearing inner cover at the third flameproof joint surface is closely matched with the rotating shaft, and the axial length of the third flameproof joint surface is greater than or equal to 25 mm. The radial clearance of the three flameproof joint surfaces is less than or equal to 0.25mm.

The outer diameter of the bearing inner cover at the tight fit section is greater than the outer diameter of the bearing inner cover at the clearance fit section, and a radial elevation is formed between the two.

The outer diameter of the end cover at the tight fitting section is larger than that at the loose fitting section, and a radial elevation is formed between the two.

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 forms a circumferential fourth flameproof joint surface, and the vertical length of the fourth flameproof joint surface is greater than or equal to 25mm , the circumferential clearance of the fourth flameproof joint surface is less than or equal to 0.1mm.

The setting method of the fixed connection between the oil seal and the outer bearing cover is as follows: the outer bearing cover is provided with a sealing groove for installing the oil seal, and the oil seal is fixedly clamped in the sealing groove.

The oil seal is a skeleton oil seal.

The beneficial effects of the utility model are:

1. In the utility model, the bearing outer cover and the rotating shaft are equipped 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 an oil seal set on the rotating shaft and interference fit with the rotating shaft and an oil seal located The inner side and the first flameproof joint surface formed at the joint between the bearing outer cover and the rotating shaft can effectively prevent combustible dust from entering the bearing chamber and the inside of the motor. Even if the oil seal is worn out due to long-term use, the gap and Length requirements (gap and length between the bearing outer cover and the shaft: the axial length of the first flameproof joint surface is greater than or equal to 17mm, and the radial clearance of the first flameproof joint surface is less than or equal to 0.314mm;) to achieve the first flameproof joint surface The explosion-proof ability of the joint surface can still prevent combustible dust from entering the bearing chamber and the interior of the motor.

2. In the utility model, the joint between the bearing inner cover and the machine base and the joint between the end cover and the machine base form a second flameproof joint surface, and the second flameproof joint surface is formed by the clearance fit section close to the inside of the motor and the joint close to the motor. The outer tight fit section is composed of the bearing inner cover at the clearance fit section and the machine base, and the end cover and the machine base are all in clearance fit, and the bearing inner cover at the tight fit section is tightly fitted with the machine base as well as the end cover and the machine base, and The axial length of the second flameproof joint surface is greater than or equal to 25mm, and the radial clearance of the second flameproof joint surface is less than or equal to 0.1mm; the joint between the bearing inner cover and the rotating shaft forms a third flameproof joint surface, and the third flameproof joint surface The bearing inner cover at the explosion-proof joint surface is closely matched with the rotating shaft, and the axial length of the third flame-proof joint surface is greater than or equal to 25mm, and the radial clearance of the third flame-proof joint surface is less than or equal to 0.25mm. By controlling the above-mentioned second The gap and length of the flameproof joint surface and the third flameproof joint surface meet the requirements of the national explosion-proof standard GB3836, so that even if the flammable gas motor explodes inside, the explosive power will not be transmitted to the outside and cause an explosion of external gas.

3. The utility model 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 forms a circumferential fourth flameproof joint surface, and the vertical direction of the fourth flameproof joint surface The length is greater than or equal to 25mm, and the circumferential clearance of the fourth flameproof joint surface is less than or equal to 0.1mm, which further improves the flameproof capability.

4. The utility model is simple in structure and easy to implement, and it can meet the requirements of motors used in combustible dust and explosive gas environments at the same time.

Description of drawings

Fig. 1 is the structural representation of the utility model;

Fig. 2 is a structural schematic diagram of the joint between the bearing outer cover and the rotating shaft in the utility model;

Fig. 3 is a structural schematic diagram of the joint between the bearing inner cover and the machine base in the utility model;

Fig. 4 is a schematic structural view of the cooperation between the end cover and the machine base in the utility model;

Fig. 5 is a structural schematic diagram of the joint between the junction box and the machine base in the utility model.

Detailed ways

As shown in Figures 1 to 5, a composite explosion-proof three-phase asynchronous motor of the present invention includes a frame 1, a stator 2 installed in the frame 1, and a rotor 3 installed in a clearance fit with the stator 2. 3 is fixedly installed on the rotating shaft 4, and the front and rear ends of the base 1 are respectively provided with end covers 5, and bearings 6 are provided between the end cover 5 and the rotating shaft 4, and the inner and outer sides of the bearings 6 are respectively provided with bearing inner covers 7 and bearing cover 8.

The joint between the bearing outer cover 8 and the rotating shaft 4 is provided with an explosion-proof structure to prevent combustible dust from entering the bearing chamber or the inside of the motor. The first flameproof joint surface A located inside the skeleton oil seal 9 and formed at the joint between the bearing outer cover 8 and the rotating shaft 4, the skeleton oil seal 9 is fixedly connected to the bearing outer cover 8, and the bearing outer cover 8 at the first flameproof joint surface A It is tightly matched with the rotating shaft 4, and the axial length L of the first explosion-proof joint surface A is greater than or equal to 17mm, and the radial clearance of the first flameproof joint surface A is less than or equal to 0.314mm (that is, the shaft hole size D2 of the bearing outer cover and the outer diameter of the rotating shaft The difference in dimension D1 is less than or equal to 0.314mm).

In this embodiment, the arrangement of the fixed connection between the framework oil seal 9 and the bearing cover 8 is as follows: the bearing cover 8 is provided with a sealing groove for installing the framework oil seal 9 , and the framework oil seal 9 is fixedly clamped in the sealing groove.

The setting of the explosion-proof structure above can effectively prevent combustible dust from entering the bearing chamber and the inside of the motor. Even if the oil seal is worn out due to long-term use, the clearance and length requirements of the shaft penetration part (that is, by controlling the shaft hole size of the bearing cover D2 The dimensional tolerance and the dimensional tolerance of the outer diameter of the shaft D1, and the length L of the explosion-proof joint surface) realize the explosion-proof ability of the first flameproof joint surface A, and still prevent combustible dust from entering the bearing chamber and the inside of the motor.

The joint between the bearing inner cover 7 and the machine base 1 forms the second flameproof joint surface B1, the second flameproof joint surface B1 is composed of a clearance fit section E2 close to the inside of the motor and a tight fit section E1 close to the outside of the motor, the clearance fit section The bearing inner cover 7 at E2 is in clearance fit with the machine base 1, and the bearing inner cover 7 at the tight fit section E1 is closely matched with the machine base 1, and the axial length of the second flameproof joint surface B1 is greater than or equal to 25mm, the first The radial clearance of the two flameproof joint surfaces B1 is less than or equal to 0.1mm. And the outer diameter of the bearing inner cover 7 at the tight fit section is larger than the outer diameter of the bearing inner cover 7 at the loose fit section, and a radial elevation is formed between the two.

The second flameproof joint surface B2 is formed at the joint between the end cover 5 and the machine base. The second flameproof joint surface B2 is composed of a clearance fit section E2 close to the inside of the motor and a tight fit section E1 close to the outside of the motor. The clearance fit section E2 The end cover 5 at the position is in clearance fit with the machine base 1, the end cover 5 at the tight fit section E1 is closely matched with the machine base 1, and the axial length of the second flameproof joint surface B2 is greater than or equal to 25mm, the second flameproof The radial clearance of joint surface B is less than or equal to 0.1mm. And the outer diameter of the end cap 5 at the tight fit section is larger than the outer diameter of the end cap 5 at the loose fit section, and a radial elevation is formed between the two.

The joint between the bearing inner cover 7 and the rotating shaft 4 forms a third flameproof joint surface C, and the bearing inner cover 7 at the third flameproof joint surface C closely cooperates with the rotating shaft 4, and the axis of the third flameproof joint surface C The longitudinal length is greater than or equal to 25mm, and the radial clearance of the third flameproof joint surface C is less than or equal to 0.25mm.

The utility model also includes a junction box 10, the junction box 10 is installed at the outlet of the machine base 1, and the joint between the junction box 10 and the machine base 1 forms a circumferential fourth flameproof joint surface D, and the fourth flameproof joint The vertical length of surface D is greater than or equal to 25mm, and the circumferential clearance of the fourth flameproof joint surface D is less than or equal to 0.1mm.

The utility model meets the provisions of the national explosion-proof standard GB3836 by controlling the gap and length of the second flameproof joint surface, the third flameproof joint surface and the fourth flameproof joint surface, and even if the flammable gas motor explodes inside, The explosive power will not be transferred to the outside world to cause the explosion of the outside gas.

The utility model has the advantages of simple structure, convenient implementation, high reliability of the explosion-proof structure, and simultaneously meets the requirements of dust explosion-proof and gas explosion-proof, and can meet the requirements of a motor used in combustible dust and explosive gas environments at the same time.

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

Claims (6)

1. a kind of composite anti-explosion type threephase asynchronous, it includes support, the stator in support and between stator Gap coordinates the rotor of installation, and rotor is fixedly mounted in rotating shaft, is correspondingly provided with end cap respectively in the front and back end of support, end cap is with turning Bearing is equipped between axle, and bearing internal external side is correspondingly provided with internal bearing cover and bearing end cover respectively, it is characterised in that：The axle Enclosing cover is held with being provided with the explosion separation structure for preventing combustible dust from entering bearing chamber or motor internal, explosion separation structure bag at rotating shaft cooperation Include and be set in rotating shaft and with the oil sealing of rotating shaft interference fit and on the inside of oil sealing and at bearing end cover and rotating shaft cooperation The first flameproof joint formed, oil sealing are fixedly connected with bearing end cover, bearing end cover and rotating shaft at the first flameproof joint It is fitted close, and the axial length of the first flameproof joint is more than or equal to 17mm, the radial clearance of the first flameproof joint is less than Equal to 0.314mm；

The second flameproof joint, the second flame proof are respectively formed at the cooperation of internal bearing cover and support and at the cooperation of end cap and support Composition surface is made up of the section with the gap of motor internal and the tight fit section close to outside motor, and gap coordinates at section Internal bearing cover and support and end cap coordinate with the equal gap of support, be fitted close internal bearing cover at section and support and end cap with Support is fitted close, and the axial length of second flameproof joint is more than or equal to 25mm, the footpath of the second flameproof joint It is less than or equal to 0.1mm to gap；

Form the 3rd flameproof joint at the cooperation of internal bearing cover and rotating shaft, internal bearing cover and rotating shaft at the 3rd flameproof joint It is fitted close, and the axial length of the 3rd flameproof joint is more than or equal to 25mm, the radial clearance of the 3rd flameproof joint Less than or equal to 0.25mm.

2. composite anti-explosion type threephase asynchronous according to claim 1, it is characterised in that：At the tight fit section Internal bearing cover external diameter be more than gap coordinate section at internal bearing cover external diameter, and between the two formed radial direction facade.

3. composite anti-explosion type threephase asynchronous according to claim 1 or 2, it is characterised in that：The tight fit End cap external diameter at section is more than the end cap external diameter at gap cooperation section, and forms radial direction facade between the two.

4. composite anti-explosion type threephase asynchronous according to claim 3, it is characterised in that：It also includes terminal box, Terminal box is arranged at support line outlet, and the 4th circumferential flameproof joint is formed at the cooperation of terminal box and support, and the The vertical extension of four flameproof joints is more than or equal to 25mm, and the circular gap of the 4th flameproof joint is less than or equal to 0.1mm.

5. composite anti-explosion type threephase asynchronous according to claim 3, it is characterised in that：Outside the oil sealing and bearing It is as follows to cover the set-up mode being fixedly connected：Bearing end cover is provided with the seal groove for being used for installing oil sealing, and oil sealing is fixed and is fastened on institute State in seal groove.

6. composite anti-explosion type threephase asynchronous according to claim 5, it is characterised in that：The oil sealing is skeleton oil Envelope.