CN106533027A - Four-pole high-power air-to-air-cooling positive pressure type explosion-proof motor - Google Patents

Abstract

The invention discloses an air-air-cooled positive-pressure explosion-proof motor with 4 extremely large powers, which includes a motor body and an air-air cooling system. The motor body includes a frame, a rotor, and a stator, wherein the stator includes a stator core, a winding coil, and a stator temperature measurement Components, the rotor includes the rotor core, the rotor shaft and the fan inside the rotor, the machine base includes the machine base shell and the middle support plate of the machine base, the middle support plate of the machine base is arranged inside the machine base shell, and the middle support plate of the machine base is provided with a Matching stator holes, the stator is fixed inside the machine base through the stator holes; the rotor iron core includes rotor punches, and the outer circumference of the rotor punches is evenly arranged with a plurality of rotor punch slots, and the rotor punch slots are pear-shaped groove structures. The invention can reduce the center height of the existing 4-pole air-cooled positive pressure explosion-proof motor, reduce the cost, facilitate the maintenance and replacement of the positive pressure type explosion-proof motor, and improve the efficiency of the positive pressure type explosion-proof motor.

Description

A 4-power air-cooled positive pressure explosion-proof motor

technical field

The invention belongs to the technical field of motors, and in particular relates to an air-air-cooled positive-pressure explosion-proof motor with 4 extremely large powers.

Background technique

The existing positive-pressure explosion-proof motors with a center height of 560mm and poles of 4 poles generally adopt a box-type structure. Water-cooled positive pressure explosion-proof motors need to be invested in cooling towers and circulating water pumps. Air-to-air cooling positive pressure explosion-proof motors only need to use natural wind to cool the motors. Because of low investment and convenient maintenance, they are more and more favored by users. The air-cooled positive pressure explosion-proof motors with a center height of 560mm and poles of 4 poles used in the explosion-proof fields such as petroleum and petrochemical industries launched in the country in the 1990s are the key equipment. High and low, high power, domestic motor manufacturers are generally difficult to meet, therefore, the 4-pole air-cooled positive pressure explosion-proof motor with the same center height and power has been in a blank position in China for a long time; at the same time, imported explosion-proof motors are expensive and low in efficiency (for efficiency No requirements), the structure is complex, and maintenance is very troublesome.

Contents of the invention

In order to solve the shortcomings of the current air-to-air cooling box-type frequency conversion motor, the present invention provides a 4-pole air-to-air-cooled positive-pressure explosion-proof motor to reduce the center height of the existing 4-pole air-to-air-cooled positive-pressure explosion-proof motor. The cost is reduced, and at the same time, the maintenance and replacement of the positive pressure type explosion-proof motor is facilitated, and the efficiency of the positive pressure type explosion-proof motor is improved.

In order to solve the above-mentioned technical problems, the present invention adopts the following technical solutions: a 4-power air-air-cooled positive-pressure explosion-proof motor, including a motor body and an air-to-air cooling system installed on the motor body, and the motor body includes a machine base, a rotor and a stator , wherein the stator includes a stator core, a winding coil and a stator temperature measuring element, and the rotor includes a rotor core, a rotor shaft and a fan inside the rotor,

The machine base includes the machine base shell and the middle support plate of the machine base. The middle support plate of the machine base is arranged inside the machine base shell. The middle support plate of the machine base is provided with a stator hole matching the stator, and the stator is fixed inside the machine base through the stator hole;

The shell of the machine base is a hollow cavity composed of the bottom plate, front end plate, rear end plate, left side plate, right side plate and top plate. The reinforced tubes of the machine base are evenly penetrated and the front end plate, the rear end plate and the middle support plate of the machine base are fixedly connected as a whole; there is a purge pipe inside the shell of the machine base, and the purge pipe is fixed on the bottom plate of the machine base shell in a U shape, and The U-shaped bottom is located at the shaft extension end of the machine base shell. One end of the purge pipe is open and the other end is closed, and an air discharge port is arranged on the pipe body. The open end of the purge pipe passes through the connection of the machine base shell. The pipe is connected to the purge system; the top plate of the machine base shell is located at the end of the shaft extension and has a ventilation hole connected to the air-to-air cooling system;

The rotor iron core includes rotor punches, and the outer circumference of the rotor punches is evenly arranged with a plurality of rotor punching grooves. The rotor punching grooves are pear-shaped grooves with a large inner cavity and a small notch. Gradually smooth and smaller towards the bottom of the lumen;

The air-to-air cooling system includes a cooler arranged above the main body of the motor and multiple rows and rows of cooling tube groups horizontally penetrating the axial direction inside the cooler. The cooling tube groups are arranged in a rectangular shape; the upper part of the cooler is provided with an exhaust port; the cooling The device is located on the side of the non-shaft extension end and is provided with an air guide structure. The air guide structure includes an air guide plate and an outer fan arranged on the rotor shaft. The outer fan is located outside the rotor bearing platform, and the air guide plate cover is arranged outside the outer fan. And form an air guide channel connecting the external fan and the cooling tube group.

A windshield is installed between the inner fan, the stator core and the rotor core, and a pressure relief hole is arranged on the windshield.

The windshield is made of fiberglass panels.

The stator temperature measuring element in the stator is led out from the air duct of the stator core.

The outer cover of the cooler is provided with a sound-absorbing cover.

The rotor inner fan is a centrifugal inner fan, and the outer diameter of the rotor inner fan is 620mm.

The diameter of the bearing table of the rotor shaft is 170 mm, and the length of the bearing distance is 2148 mm.

The rotor bearing arranged on the rotor bearing table is a rolling bearing, and the bearing end cover of the rolling bearing is cast iron, and its thickness is 25mm.

The stator iron core includes the stator punch, the outer diameter of the stator punch is 1000mm, the outer diameter of the rotor punch is 632mm, the height of the frame is 1190mm, and the length of the frame is 2200mm.

The length of the left side plate and the right side plate in the base is 2200mm, the thickness of the front end plate and the rear end plate is 30mm, and the thickness of the bottom plate, left side plate and right side plate is 8mm.

The beneficial effects of the present invention are:

Through the above technical solution, the present invention successfully reduces the frame size of the 4-pole 3000kW air-air-cooled positive pressure explosion-proof motor from the conventional 630mm to 560mm, and has the competitive advantages of small size, light weight, high efficiency and low noise. At the same time, the imported motor can be replaced; the invention reduces the center height of the existing 4-pole air-cooled positive pressure explosion-proof motor, reduces costs and improves efficiency; at the same time, the installation size and shaft extension of the positive pressure type explosion-proof motor are consistent with the original imported motor , to facilitate the repair and replacement of the positive pressure type explosion-proof motor, and improve the efficiency of the positive pressure type explosion-proof motor.

In the present invention, the stator temperature-measuring element is led out from the stator core air passage, which can avoid contact discharge between the stator temperature-measuring element and the winding coil at the end.

In the present invention, the rotor punching groove is a pear-shaped groove structure with a large inner cavity and a small notch, and the inner cavity gradually becomes smaller from the end close to the notch to the bottom of the inner cavity. The pear-shaped groove structure adopted is different from the existing one. Compared with rectangular slots or other pear-shaped slots, the advantages are: on the one hand, it can reduce the starting current multiple, so that the starting current is reduced from 7 times the rated current to 5 times the rated current, which greatly reduces the large starting current when the motor is started. The large starting current has a huge impact on the power grid, and in severe cases, the power grid can be tripped and cut off.

The rotor bearing is a rolling bearing, the length of the bearing distance is 2148mm, and the outer diameter of the rotor inner fan 2 is 620mm, which can effectively reduce the Bearing friction mechanical loss and fan ventilation mechanical loss increase the efficiency of the motor by 1%. The end cover of the rotor bearing is a cast iron structure, and the end cover is a full circle structure with a thickness of 25mm. Compared with the conventional 40mm thick semicircular end cover, the end cover bearing is not easy to vibrate and light in weight when the motor is running.

The air-to-air cooling system of the present invention includes a cooler arranged above the main body of the motor and multiple rows and rows of cooling tube groups horizontally penetrating in the axial direction inside the cooler. The cooling tube groups are arranged in a rectangular shape; the upper part of the cooler is provided with an exhaust The cooler is located on the side of the non-shaft extension end and is provided with an air guide structure. The air guide structure includes an air guide plate and an external fan arranged on the rotor shaft. The external fan is located outside the rotor bearing table, and the air guide plate cover is set on the Outside the outer fan, there is an air guide channel connecting the outer fan and the cooling tube group. The cooling tube group adopts a rectangular cooling arrangement, so that all the air volume stirred by the external fan can enter the cooling tube. The air volume is large, the cooling effect is good, and the weight is also light.

The center height of the air-to-air cooling positive pressure type explosion-proof motor of the present invention is on the frame size of 560mm, the outer diameter of the stator punching sheet of this power gear is reduced from 1120mm to 1000mm, the outer diameter of the rotor punching sheet is reduced from 700mm to 632mm, and the height of the frame is reduced from 1320mm Reduced to 1190mm, the frame length was reduced from 2570mm to 2200mm, and the frame size of this power range was reduced from 630mm to 560mm successfully.

The diameter of the rotor bearing table of the air-air-cooled positive pressure explosion-proof motor of the present invention is reduced from 200mm to 170mm, the weight of the rotor is reduced from 3.6 tons to 2.6 tons, and the bearing structure is changed from a sliding bearing to a rolling bearing structure, which effectively reduces the rotor bearing table and bearings. frictional mechanical loss; the outer diameter of the inner fan is reduced from 670mm to 620mm, there are rectangular ventilation holes on the top plate of the machine base, and the cooling tube group is designed as a rectangular structure, which effectively reduces the The ventilation mechanical loss of the fan and cooler in the rotor improves the heat exchange efficiency of the cooler, and the total efficiency reaches 96.3% of the standard value of the second-class high-efficiency motor stipulated in the national standard "GB30254-2013 Energy Efficiency Limits and Energy Efficiency Grades of High Voltage Motors" .

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is a schematic structural view of the hollow air cooling system of the present invention;

Fig. 3 is the A direction view in Fig. 2;

Fig. 4 is the top view of purging pipeline among the present invention;

Fig. 5 is the assembly diagram of purging pipeline among the present invention;

Fig. 6 is the structural representation of stator among the present invention;

Fig. 7 is a structural schematic diagram of the rotor in the present invention;

Fig. 8 is a schematic diagram of the structure of the punching groove of the rotor in the present invention.

detailed description

As shown in Figures 1 to 8, a 4-power air-air-cooled positive pressure explosion-proof motor of the present invention includes a motor body and an air-air cooling system 4 installed on the motor body, and the motor body includes a base 1 and a stator 2 And the rotor 3, wherein the stator 2 includes a stator core 20, a winding coil 21 and a stator temperature measuring element 22, and the rotor 3 includes a rotor core 31, a rotor shaft 32 and a fan 33 in the rotor.

The machine base 1 includes the machine base shell and the middle support plate 12 of the machine base. The middle support plate 12 of the machine base is arranged inside the machine base shell 1. The middle support plate 12 of the machine base is provided with a stator hole matching the stator, and the stator 2 passes through the stator hole. It is fixed inside the base 1.

The shell of the machine base is a hollow cavity composed of the bottom plate, front end plate, rear end plate, left side plate, right side plate and top plate. The reinforced tube penetrates evenly and welds the front end plate, rear end plate and the middle support plate of the machine base into one body. After welding, the integrity of the machine base is better, which can effectively prevent the motor from vibrating.

The top plate of the machine base shell is located at the end of the shaft extension and is provided with a ventilation hole 16 connected with the air-to-air cooling system.

There is a purge pipeline 13 inside the base shell, and the purge pipeline 13 is U-shaped and fixed on the bottom plate of the base shell, and the U-shaped bottom 131 is located at the shaft extension end of the base shell, and one end of the purge pipeline is open. One end is closed, and an air outlet is arranged on the pipe body. The open end 132 of the purge pipe 13 is connected to the purge system 15 through the connecting pipe 14 passing through the shell of the machine base. The purge system blows air into the purge pipe 13, and the wind is discharged through the air outlet arranged on the purge pipe 13, and the dangerous gas in the motor is blown into the air-to-air cooling system 4 through the ventilation hole 16 and discharged through its exhaust port. Improve the explosion-proof capability of the motor.

The rotor iron core includes rotor punches, and the outer circumference of the rotor punches is uniformly arranged with a plurality of rotor punching grooves 34, the rotor punching grooves 34 are pear-shaped groove structures with a large inner cavity and a small notch, and the inner cavity is formed by a groove close to the groove. One end of the mouth gradually becomes smaller smoothly towards the bottom of the lumen.

The air-to-air cooling system 4 includes a cooler 41 arranged above the main body of the motor and a plurality of rows and rows of cooling tube groups 42 horizontally penetrating in the axial direction inside the cooler 41. The cooling tube groups 42 are arranged in a rectangular shape; the upper part of the cooler 41 is provided with There is an exhaust port; the cooler 41 is located on the side of the non-shaft extension end and is provided with an air guide structure. The air guide structure includes an air guide plate 51 and an external fan 52 arranged on the rotor shaft 32. The external fan 52 is located on the rotor bearing table. On the outside, the air deflector 51 is disposed outside the outer fan 52 and forms an air guide passage connecting the outer fan 52 and the cooling tube set 42 . The number of cooling pipes is 798, the length is 2225mm, and the diameter is 20mm. The air volume stirred by the external fan can all enter the cooling pipes. The air volume is large, the cooling effect is good, and the weight is also light. The cooling pipes are designed with stainless steel. The material of the stainless steel cooling pipes is the same as ordinary Compared with carbon steel, the pipe is not easy to rust. The cooler 41 is covered with a muffler cover 43 .

A windshield 6 is installed between the rotor inner fan 33, the stator core 20, and the rotor core 31. The windshield 6 is provided with a pressure relief hole, and the windshield is made of glass fiber board. Because the strength of the glass fiber board is high, and the pressure relief hole can well adjust the pressure in the housing of the machine base, the glass fiber board with the pressure relief hole can effectively prevent the motor from shifting due to excessive pressure in the housing of the machine base. situation occurs.

The stator temperature-measuring element 22 in the stator 2 is led out from the air duct of the stator core 20, which can avoid contact discharge between the stator temperature-measuring element and the winding coil at the end.

The rotor inner fan 33 is a centrifugal inner fan, and the outer diameter of the rotor inner fan 33 is 620mm.

The diameter of the bearing pedestal of the rotor shaft 32 is 170mm, and the length of the bearing distance between the two bearing pedestals is 2148mm. The rotor bearing 7 arranged on the rotor bearing table is a rolling bearing, and the bearing end cover 71 of the rolling bearing 333 is cast iron, and its thickness is 25mm, which can effectively reduce the loss due to bearing friction, thereby improving the efficiency of the explosion-proof motor.

The stator iron core 20 includes stator punches, the outer diameter of the stator punches is 1000 mm, the outer diameter of the rotor punches is 632 mm, the height of the frame is 1190 mm, and the length of the frame is 2200 mm.

The length of the left side plate and the right side plate in the base is 2200mm, the thickness of the front end plate and the rear end plate is 30mm, and the thickness of the bottom plate, left side plate and right side plate is 8mm. Compared with the existing positive pressure type explosion-proof motor, the overall weight of the base is greatly reduced, the center height is reduced, and the universality is good.

In the present invention, the stator winding is impregnated with VPI vacuum high pressure as a whole. After the overall impregnation, all parts of the winding are integrated and can withstand greater electromagnetic tension and overvoltage impact.

Through the above technical solution, the present invention successfully reduces the frame size of the 4-pole 3000kW air-air-cooled positive pressure explosion-proof motor from the conventional 630mm to 560mm, and has the competitive advantages of small size, light weight, high efficiency and low noise. At the same time, the imported motor can be replaced; the invention reduces the center height of the existing 4-pole air-cooled positive pressure explosion-proof motor, reduces costs and improves efficiency; at the same time, the installation size and shaft extension of the positive pressure type explosion-proof motor are consistent with the original imported motor , to facilitate the repair and replacement of the positive pressure type explosion-proof motor, and improve the efficiency of the positive pressure type explosion-proof motor.

In the present invention, the rotor punching groove 34 is a pear-shaped groove structure with a large inner cavity and a small notch, and the inner cavity gradually becomes smaller from the end close to the notch to the bottom of the inner cavity. The pear-shaped groove structure adopted is different from the existing one. Compared with rectangular slots or other pear-shaped slots, the advantages are: on the one hand, it can reduce the starting current multiple, so that the starting current is reduced from 7 times the rated current to 5 times the rated current, which greatly reduces the large starting current when the motor starts. , The large starting current has a huge impact on the power grid, and in severe cases, the power grid can be tripped and cut off.

The rotor bearing 7 is a rolling bearing, the length of the bearing distance is 2148mm, and the outer diameter of the rotor inner fan 2 is 620mm. Compared with the prior art sliding bearing table diameter of 200mm, bearing distance of 2475mm, and inner fan outer diameter of 670mm, the bearing friction can be effectively reduced Mechanical loss and fan ventilation mechanical loss, improve motor efficiency by 1%. The end cover 71 of the rotor bearing 7 is a cast iron structure, and the end cover is a full circle structure with a thickness of 25mm. Compared with the conventional 40mm thick semicircular end cover, when the motor is running, the end cover bearing is not easy to vibrate and light in weight.

The center height of the air-to-air cooling positive pressure type explosion-proof motor of the present invention is on the frame size of 560mm, the outer diameter of the stator punching sheet of this power gear is reduced from 1120mm to 1000mm, the outer diameter of the rotor punching sheet is reduced from 700mm to 632mm, and the height of the frame is reduced from 1320mm Reduced to 1190mm, the frame length was reduced from 2570mm to 2200mm, and the frame size of this power range was reduced from 630mm to 560mm successfully.

The diameter of the rotor bearing table of the air-air-cooled positive pressure explosion-proof motor of the present invention is reduced from 200mm to 170mm, the weight of the rotor is reduced from 3.6 tons to 2.6 tons, and the bearing structure is changed from a sliding bearing to a rolling bearing structure, which effectively reduces the rotor bearing table and bearings. frictional mechanical loss; the outer diameter of the inner fan is reduced from 670mm to 620mm, and there are rectangular ventilation holes on the top plate of the base, and the cooling tube group is designed as a rectangular structure, which effectively reduces the The ventilation mechanical loss of the fan and cooler in the rotor improves the heat exchange efficiency of the cooler, and the total efficiency reaches 96.3% of the standard value of Class 2 high-efficiency motors stipulated in the national standard "GB30254-2013 Energy Efficiency Limits and Energy Efficiency Grades of High Voltage Motors" .

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 (10)

1. An air-air-cooled positive-pressure explosion-proof motor with 4 extremely large powers, including a motor body and an air-air cooling system installed on the motor body, the motor body includes a frame, a rotor and a stator, wherein the stator includes a stator core, a winding coil and a stator temperature measuring element, the rotor includes a rotor core, a rotor shaft and a fan inside the rotor, and is characterized in that: The machine base includes the machine base shell and the middle support plate of the machine base. The middle support plate of the machine base is arranged inside the machine base shell. The middle support plate of the machine base is provided with a stator hole matching the stator, and the stator is fixed inside the machine base through the stator hole; The shell of the machine base is a hollow cavity composed of the bottom plate, front end plate, rear end plate, left side plate, right side plate and top plate. The reinforced tubes of the machine base are evenly penetrated and the front end plate, the rear end plate and the middle support plate of the machine base are fixedly connected as a whole; there is a purge pipe inside the shell of the machine base, and the purge pipe is fixed on the bottom plate of the machine base shell in a U shape, and The U-shaped bottom is located at the shaft extension end of the machine base shell. One end of the purge pipe is open and the other end is closed, and an air discharge port is arranged on the pipe body. The open end of the purge pipe passes through the connection of the machine base shell. The pipe is connected to the purge system; the top plate of the machine base shell is located at the end of the shaft extension and has a ventilation hole connected to the air-to-air cooling system; The rotor iron core includes rotor punches, and the outer circumference of the rotor punches is evenly arranged with a plurality of rotor punching grooves. The rotor punching grooves are pear-shaped grooves with a large inner cavity and a small notch. Gradually smooth and smaller towards the bottom of the lumen; The air-to-air cooling system includes a cooler arranged above the main body of the motor and multiple rows and rows of cooling tube groups horizontally penetrating the axial direction inside the cooler. The cooling tube groups are arranged in a rectangular shape; the upper part of the cooler is provided with an exhaust port; the cooling The device is located on the side of the non-shaft extension end and is provided with an air guide structure. The air guide structure includes an air guide plate and an outer fan arranged on the rotor shaft. The outer fan is located outside the rotor bearing platform, and the air guide plate cover is arranged outside the outer fan. And form an air guide channel connecting the external fan and the cooling tube group. 2. The 4 extremely powerful air-air-cooled positive pressure explosion-proof motor according to claim 1, characterized in that: a windshield is installed between the inner fan, the stator core, and the rotor core, and a pressure relief hole is arranged on the windshield . 3. The 4 extremely powerful air-air-cooled positive pressure explosion-proof motor according to claim 2, characterized in that: the windshield is made of glass fiber board. 4. The 4 extremely powerful air-air-cooled positive pressure explosion-proof motor according to claim 1, characterized in that: the stator temperature measuring element in the stator is led out from the air duct of the stator core. 5. The 4 extremely powerful air-air-cooled positive pressure explosion-proof motor according to claim 1, characterized in that: the outer cover of the cooler is provided with a sound-absorbing cover. 6. The 4-high power air-air-cooled positive pressure explosion-proof motor according to any one of claims 1-5, characterized in that: the inner fan of the rotor is a centrifugal inner fan, and the outer diameter of the inner fan of the rotor is 620mm. 7. The 4 extremely powerful air-air-cooled positive pressure explosion-proof motor according to any one of claims 1-5, characterized in that: the diameter of the bearing platform of the rotor shaft is 170mm, and the length of the bearing distance is 2148mm. 8. The 4 extremely high-power air-air-cooled positive pressure explosion-proof motor as claimed in claim 7, characterized in that: the rotor bearing set on the rotor bearing table is a rolling bearing, and the bearing end cover of the rolling bearing is cast iron with a thickness of 25 mm. 9. The air-air-cooled positive pressure type explosion-proof motor with 4 extremely large powers as claimed in any one of claims 1-5, characterized in that: the stator iron core includes stator punches, the outer diameter of the stator punches is 1000mm, and the outer diameter of the rotor punches The diameter is 632mm, the base height is 1190mm, and the base length is 2200mm. 10. The 4 extremely high-power air-air-cooled positive pressure explosion-proof motor as claimed in claim 9, characterized in that: the length of the left side plate and the right side plate in the base is 2200mm, and the thickness of the front end plate and the rear end plate is 30mm , the thickness of the bottom plate, left side plate and right side plate is 8mm.