CN207638454U - A high-power dust explosion-proof coal mill motor - Google Patents

Abstract

The utility model discloses a kind of high power dust explosion protection motor of coal crusher, including engine base, stator, rotor, shaft are installed in engine base, which is characterized in that the front support sealing structure for being used to support shaft front end, the rear support sealing structure for being used to support shaft rear end are installed on engine base；The front support sealing structure includes the end cap being fixedly connected on engine base, bearing is installed among end cap, bearing is fixed in shaft, internal bearing cover is fixed on the inside of end cap, bearing cover is fixed on the outside of end cap, end cap, internal bearing cover and the common fixing bearing of bearing cover are equipped with disc between bearing cover and shaft, the disc is interference fitted with shaft, is rotatablely connected by labyrinth clearance fit structure between disc and bearing cover；To effectively prevent dust to enter base inner, that is, it is directed to the requirement that different motor using areas specifically reaches degree of protection IP6X dirt close shell and degree of protection IP5X dust covers.

Description

A high-power dust explosion-proof coal mill motor

technical field

The utility model belongs to the technical field of motors, in particular to a high-power dust explosion-proof coal mill motor.

Background technique

The coal mill has a wide range of applications, and is specially used for the preparation of coal powder in steel mills, thermal power plants, and cement plants and the production of large-scale powder production of coal gangue; the large-scale powder production of hundreds of ores with various hardnesses in the non-metallic mining industry; the steel slag for special steel mills and blast furnace slag, power plant slag and fly ash grinding; special glass fiber industry quartz, pyrophyllite powder large-capacity high-fineness grinding; special chemical industry various chemical raw materials large-capacity powder production; other more than 100 kinds of industries Industrialized preparation of large-volume powder of materials. At the same time, it also has a good development prospect in grinding slag powder and cement clinker pre-grinding. The dust generated during production, processing, transportation, and storage is flammable. If the dust and air are mixed in an appropriate proportion, the dust can burn rapidly to generate a huge explosion pressure when ignited. Therefore, in places where such flammable materials may appear, it is usually necessary to use explosion-proof electrical equipment.

After the Tianjin Binhai New Area explosion accident occurred on August 12, 2015, the national security inspection department increased the safety inspection of enterprises, requiring the traditional ordinary coal mill motors to be gradually replaced by dust explosion-proof coal mill motors, so ordinary mills Special motors for coal machines will gradually withdraw from the stage of history, and dust explosion-proof coal mill motors will replace them. At present, the dust explosion-proof coal pulverizer motor with IC411 structure is widely used. The existing dust explosion-proof coal pulverizer motor with IC411 structure has not yet reached the requirements of IP6X protection level, so it cannot meet the application of coal grinding.

Utility model content

The purpose of the utility model is to provide a high-power dust-proof explosion-proof coal mill motor, which effectively prevents dust from entering the motor housing, that is, achieves protection grade IP6X dust-tight casing and protection grade IP5X dust-proof casing for different motor use areas. function, the technical scheme that the utility model takes for achieving the above-mentioned purpose is:

A high-power dust explosion-proof coal pulverizer motor, including a machine base, a stator, a rotor, and a rotating shaft are installed in the machine base, and a front support sealing structure for supporting the front end of the rotating shaft and a rear support for supporting the rear end of the rotating shaft are installed on the machine base. Supporting sealing structure; the front supporting sealing structure includes an end cover fixedly connected to the machine base, a bearing is fixedly installed in the middle of the end cover, the bearing is fixed on the rotating shaft, and a bearing inner cover is fixed on the inner side of the end cover. The bearing outer cover is fixed on the outer side of the bearing, the end cover, the bearing inner cover and the bearing outer cover jointly fix the bearing, and an oil throwing ring is installed between the bearing outer cover and the rotating shaft, and the oil throwing ring and the rotating shaft have an interference fit, and the oil throwing ring It is rotationally connected with the outer bearing cover through a labyrinth gap fit structure;

The rear support sealing structure is arranged symmetrically with the front support sealing structure.

Preferably, an annular groove is provided on the inner wall of the oil slinger so that two interference fits are formed between the inner wall of the oil slinger and the rotating shaft.

Preferably, the interference fit between the oil slinger and the shaft is 4 to 6 wires, the roughness of the inner wall of the oil slinger is Ra≤3.2, and the roughness of the shaft corresponding to the position of the oil slinger is Ra≤1.6.

Preferably, in the direction close to the end cover, the oil flinger sequentially includes a first ring segment, a second ring segment and a third ring segment, the first ring segment, the second ring segment and the third ring segment The outer diameter decreases successively. A first sealing groove is provided around the circumferential direction on the end surface of the first ring segment close to the end cover, and a second sealing groove is provided around the circumference direction on the second ring segment; There is a sealing structure that cooperates with the first sealing groove and the second sealing groove of the first ring segment, the second ring segment, and the third ring segment to form the labyrinth clearance fit structure.

Preferably, a retaining ring for fixing the oil throwing ring is installed on the rotating shaft.

Preferably, the machine base is provided with an annular end plate for fixing the end cover, and the end cover and the annular end plate are fixed in a tight installation mode through the joint bolts, and the end cover and the annular end plate are in clearance fit, The gap is 2~5 wires, and the surface roughness of the mating surface of the end cover and the annular end plate is Ra≤1.6.

Preferably, it also includes a main junction box, a winding lead wire protrudes from the side wall of the machine base, a rubber wire sleeve is provided between the winding lead wire and the side wall of the machine base, and a first annular A seat plate, a second annular seat plate is provided on the main junction box, the first annular seat plate and the second annular seat plate are connected by a transitional annular support, the first annular seat plate, the second annular seat plate and the O-shaped sealing rings are arranged between the transition annular supports, and the winding leads are connected to the main junction box through the first annular seat plate, the transition annular support and the second annular seat plate.

Preferably, it also includes a cooler, a sealing gasket is pasted between the contact surface of the cooler and the machine base, and a plurality of support keys for supporting the cooler are welded on the upper side of the machine base, and a plurality of support keys are welded along the Arranged according to the shape of the gasket, the top surface of the gasket is higher than the top surface of the support key to leave an extrusion amount.

The beneficial effects of the utility model are: through the design of the front support sealing structure, the rear support sealing structure, the main junction box, and the cooler sealing structure, the protection level of the joint surface installed at the through part of the rotating shaft has reached the design requirement of IP6X; The protection level of the installation joint surface of the outer cover and the end cover has reached the design requirements of IP6X; the protection level of the installation joint surfaces of the oil throwing ring, the bearing cover and the rotating shaft has reached the design requirements of IP6X; the installation joint surface of the end cover and the machine base The protection level has reached the design requirements of IP6X; the protection level of the installation joint surface of the main junction box and the machine base has reached the design requirements of IP6X; the protection level of the installation joint surface of the cooler and the machine base has reached the design requirements of IP6X, thus Effectively prevent dust from entering the inside of the machine base, that is, meet the requirements of protection class IP6X dust-tight enclosure and protection class IP5X dust-proof enclosure for different motor use areas.

Description of drawings

Fig. 1 is the structural representation of front support sealing structure;

Fig. 2 is the structural representation of oil throwing ring;

Figure 3 is a schematic structural view of the bearing cover;

Figure 4 is a schematic diagram of the connection structure between the main junction box and the machine base;

Fig. 5 is a structural schematic diagram of the utility model.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is further described.

As shown in Figures 1 to 5, a high-power dust explosion-proof coal mill motor includes a frame 25, a stator, a rotor, and a rotating shaft 1 are installed in the frame 25, and a motor for supporting the rotating shaft 1 is installed on the frame 25. The front support seal structure at the front end, the rear support seal structure for supporting the rear end of the rotating shaft; To fix the annular end plate 23 of the end cover 6, the installation method is fixed between the end cover 6 and the annular end plate 23 through the joint bolts, and the end cover 6 and the annular end plate 23 have a gap fit, and the gap is 2~5 wires, the surface roughness of the mating surface of the end cover 6 and the annular end plate 23 is Ra≤1.6;

A bearing 5 is fixedly installed in the middle of the end cover 6, and the bearing 5 is fixed on the rotating shaft 1. A bearing inner cover 7 is fixed on the inner side of the end cover 6, and a bearing outer cover 4 is fixed on the outer side of the end cover 6. The end cover 6, the bearing The inner cover 7 and the bearing outer cover 4 jointly fix the bearing 5, and an oil throwing ring 3 is installed between the bearing outer cover 4 and the rotating shaft 1. The covers 4 are rotatably connected by a labyrinth gap fit structure, and a retaining ring 2 for fixing the oil slinger 3 is installed on the rotating shaft 1. The rear support sealing structure and the front support sealing structure are arranged symmetrically, and will not be repeated here.

As shown in Figure 2, an annular groove 12 is provided on the inner wall of the oil throwing ring 3 so that the inner wall of the oil throwing ring 3 and the rotating shaft 1 form two interference fits 11; wherein the interference amount of the two interference fits 11 is 4 ~6 wires, the roughness of the inner wall of the oil throwing ring 3 is Ra≤3.2, the roughness of the shaft 1 corresponding to the position of the oil throwing ring 3 is Ra≤1.6, and the setting of the ring groove 12 is mainly used for the storage of a small amount of unavoidable dust .

Further, in the direction close to the end cover 6, the oil slinger 3 sequentially includes a first ring segment 9, a second ring segment 15 and a third ring segment 13, the first ring segment 9, the second ring segment 15 and the outer diameter of the third ring segment 13 decreases in turn, the first sealing groove 10 is provided around the circumferential direction on the end face of the first ring segment 9 close to the end cover 6, and the second ring segment 15 is provided with a The second sealing groove 14; on the end cover 6, there are seals that match the first ring segment 9, the second ring segment 15, the third ring segment 13, the first sealing groove 10 and the second sealing groove 14 structure 16 to form the labyrinth clearance fit.

As shown in Figure 4, the motor also includes a main terminal box 22, a winding lead wire protrudes from the side wall of the machine base 25, and a rubber wire sleeve 18 is provided between the winding lead wire and the side wall of the machine base 25. A first annular seat plate 19 is provided on the side wall of the seat 25, a second annular seat plate 21 is provided on the main junction box 22, and a transitional annular support is passed between the first annular seat plate 19 and the second annular seat plate 21 The seat 20 is connected, the first annular seat plate 19, the second annular seat plate 21 and the transitional annular support 20 are provided with O-shaped sealing rings 17, and the winding leads pass through the first annular seat plate 19 and the transitional annular support 20 , The second annular seat plate 21 is connected into the main junction box 22 .

As shown in Figure 5, the motor also includes a cooler 24, a gasket is pasted between the contact surface of the cooler 24 and the base 25, and a plurality of cooling pads are welded on the upper side of the base 25 to support the cooler. 24 support keys, a plurality of support keys are arranged along the shape of the gasket, and the top surface of the gasket is higher than the top surface of the support keys to leave an extrusion amount.

Through the design of the front support seal structure, the rear support seal structure, the main junction box 22, and the cooler 24 seal structure, the protection level of the installation joint surface at the penetration part of the rotating shaft has reached the design requirements of IP6X; the outer bearing cover 4 and the end cover 6 The protection level of the installation joint surface has reached the design requirements of IP6X; the protection level of the installation joint surface of the oil throwing ring 3, the bearing cover 4, and the rotating shaft 1 has reached the design requirements of IP6X; the protection level of the installation joint surface of the end cover 6 and the machine base 25 The grades have reached the design requirements of IP6X; the protection grades of the installation joint surfaces of the main junction box 22 and the machine base 25 have reached the design requirements of IP6X; the protection grades of the installation joint surfaces of the cooler 24 and the machine base 25 have reached the design requirements of IP6X Requirements, so as to effectively prevent dust from entering the inside of the machine base 25, that is, specifically meet the requirements of the protection class IP6X dust-tight enclosure and the protection class IP5X dust-proof enclosure for different motor use areas.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present utility model, and are not intended to limit it; although the utility model has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: It is still possible to modify the technical solutions described in the foregoing embodiments, or to perform equivalent replacements for some of the technical features, but these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit of the technical solutions of the various embodiments of the present invention and range.

Claims (8)

1. a kind of high power dust explosion protection motor of coal crusher, including engine base are equipped with stator, rotor, shaft in engine base, special Sign is, the front support sealing structure for being used to support shaft front end, the rear branch for being used to support shaft rear end are equipped on engine base Support sealing structure；The front support sealing structure includes the end cap being fixedly connected on engine base, is installed among end cap Bearing, bearing are fixed in shaft, and internal bearing cover is fixed on the inside of end cap, and bearing cover is fixed on the outside of end cap, End cap, internal bearing cover and the common fixing bearing of bearing cover, are equipped with disc between bearing cover and shaft, described to get rid of oil Ring is interference fitted with shaft, is rotatablely connected by labyrinth clearance fit structure between disc and bearing cover；

The rear support sealing structure is symmetrical arranged with front support sealing structure.

2. high power dust explosion protection motor of coal crusher according to claim 1, which is characterized in that set on disc inner wall There is annular groove and disc inner wall is made to form twice interference fit with shaft.

3. high power dust explosion protection motor of coal crusher according to claim 2, which is characterized in that disc and shaft interference The interference volume of cooperation is 4 ~ 6 silks, roughness Ra≤3.2 of disc inner wall, the shaft of part corresponding with disc position Roughness Ra≤1.6.

4. high power dust explosion protection motor of coal crusher according to claim 3, which is characterized in that by the direction of proximal cover On, the disc is successively including first annular section, the second ring segment and third ring segment, described first annular section, the second ring The outer diameter of shape section and third ring segment is sequentially reduced, and at first annular section, circumferentially direction is equipped with first on the end face of proximal cover Sealed groove, circumferentially direction is equipped with the second sealed groove on the second ring segment；Be equipped on end cap with first annular section, the Second ring section, the first sealed groove of third ring segment and the matched sealing structure of the second sealed groove are to form between the labyrinth Gap fit structure.

5. high power dust explosion protection motor of coal crusher according to any one of claims 1 to 4, which is characterized in that in shaft On baffle ring for fixing disc is installed.

6. high power dust explosion protection motor of coal crusher according to any one of claims 1 to 4, which is characterized in that in engine base It is equipped with the annular endplate for fixing end cap, by seam allowance fitted bolt tight installation side between the end cap and annular endplate Formula is fixed, the end cap and annular endplate clearance fit, and gap value is 2 ~ 5 silks, the table of the mating surface of end cap and annular endplate Equal Ra≤1.6 of surface roughness.

7. high power dust explosion protection motor of coal crusher according to claim 5, which is characterized in that further include main junction box, It is extended with winding lead wire on the side wall of engine base, rubber-sheathed wire set is equipped between winding lead wire and engine base side wall, in engine base side Wall is equipped with first annular seat board, and the second annular seat board, the first annular seat board and the second annular are equipped on main junction box It is connected by transition annular ledge between seat board, is all provided between first annular seat board, the second annular seat board and transition annular ledge There are O-ring seal, winding lead wire to access main junction box by first annular seat board, transition annular ledge, the second annular seat board It is interior.

8. high power dust explosion protection motor of coal crusher according to claim 5, which is characterized in that further include cooler, institute It states and is adhesive with gasket between cooler and the contact surface of engine base, be welded in the upper side of engine base and multiple be used to support cooler Support key, multiple support keys are along gasket arrangements, and gasket top surface is higher than support key top face with there are amount of compression.