CN207638499U - A low-center high-capacity three-phase asynchronous motor - Google Patents

Abstract

The utility model discloses a kind of high large capacity threephase asynchronous in low center, including engine base and the cooler being fixed on above engine base, rotor and stator core are provided in engine base, cooler includes the air inlet structure positioned at cooler both ends, air exhausting structure in the middle part of cooler, air inlet structure includes external air inlet port and outgoing tuyere, air exhausting structure includes interior air inlet and two interior air outlets, two interior air outlets are respectively positioned on the top of interior air inlet, air inlet structure further includes the deflector outside the Qu Lu that cooler width direction is arranged, the external air inlet port of air inlet structure is respectively positioned on cooler bottom and the outside positioned at engine base, air exhausting structure further includes the inner deflector arranged along cooler length direction.Cooler uses compact-sized and from cooler bottom air inlet bent road air inlet structure in the utility model, meet noise it is lower under the premise of, the center for reducing motor is high.

Description

A low-center high-capacity three-phase asynchronous motor

technical field

The utility model relates to the technical field of three-phase asynchronous motors, in particular to a low-center, high-capacity three-phase asynchronous motor.

Background technique

Three-phase asynchronous motors are an important part of industrial refrigerators and commercial air conditioners. With the continuous development of science and technology, industrial refrigerators and commercial air conditioners have higher and higher requirements for motor performance. The design and testing of motors are carried out in the United States Electrical Manufacturers Association NEMA related standards. And with the ever-changing market demand, the demand for low-center, high-capacity motors continues to increase.

However, the existing motor not only has a high center height and a large external dimension, but also the noise is difficult to meet the requirements. Therefore, the existing motor cannot meet the needs of users with low center height, large capacity and low noise.

Utility model content

The purpose of this utility model is to provide a three-phase asynchronous motor with a low center height and large capacity. It adopts a winding air intake structure with a compact structure and enters the air from the bottom of the cooler. On the premise of lower noise, the center height of the motor is reduced. .

In order to achieve the above object, the utility model adopts the following technical solutions:

A low-center, high-capacity three-phase asynchronous motor, including a machine base and a cooler fixed above the machine base. A rotor and a stator core are arranged inside the machine base. The cooler includes an air inlet structure located at both ends of the cooler, and a The air outlet structure, the air inlet structure includes an outer air inlet and an outer air outlet, the outer air outlet is arranged at the bottom of the cooler, located on the inner side of the outer air inlet and corresponds to the air outlet of the machine base, and the air outlet structure includes an outer air outlet arranged on the bottom of the cooler and connected to the air outlet. The inner air inlet corresponding to the air outlet of the machine base and the two inner air outlets arranged on the side wall corresponding to the air outlet structure of the cooler, the two inner air outlets are located above the inner air inlet, after the outside air enters the air inlet structure The air from the inside of the machine base flows into the outside through the inner air outlet of the air outlet structure. The air inlet structure also includes curved outer deflectors arranged along the width direction of the cooler. The outer air inlets of the air inlet structure are located at the bottom of the cooler and outside the machine base. The outside air enters the air inlet structure from the outer air inlet and rotates 180° into the machine base; the air outlet structure also includes an inner deflector arranged along the length of the cooler.

The cooler includes a top cover, two air inlet structures are symmetrically arranged at both ends inside the top cover, and the air outlet structure is arranged in the middle of the top cover and between the two air intake structures; There is a sound-absorbing layer on the inner side of the outer deflector of the winding road; the inner deflector is bat-wing-shaped, and the inner deflector is composed of two arc plates, and the lower ends of the two arc plates are combined to form a shape corresponding to the middle of the air outlet of the machine base. At the diversion end, the upper ends of the two arc plates face the inner air outlet, and the inner sides of the two arc plates are provided with sound-absorbing layers.

Two internal fans symmetrically fixed at both ends of the rotor are also arranged in the frame.

The internal fan is a centrifugal internal fan, and the centrifugal internal fan is fixed on the copper bar of the rotor through bolts.

The front end of the base is provided with an end cover, the end cover is welded by a flange, a support plate and a cover plate, the support plate is fixed between the flange plate and the cover plate, and the cover plate is formed by a first The ring plate and the second ring plate located on the inner side are composed of the first ring plate and the second ring plate are coaxial, the second ring plate is fixed in the center hole of the first ring plate, and the second ring plate is along the The axial width is greater than the axial width of the first annular plate.

The flange plate, the support plate, the first annular plate and the second annular plate are all processed by steel plate, the thickness of the first annular plate is 25~30mm, the thickness of the second annular plate is 28~33mm, the thickness of the first annular plate is The plate is welded to the second annular plate.

A winding coil is arranged on the stator core, and a wind-shielding structure is fixedly arranged at the end of the winding coil, and the wind-shielding structure includes a wind-shielding ring arranged on the inner circle of the winding coil and coaxial with the stator core.

The windshield ring is made of glass fiber board, which is bound at the end of the winding coil with glass glue.

A junction box is also arranged on the machine base, and the junction box includes an installation box provided with a cable inlet and three insulators. The three insulators are all installed in the installation box, and the installation position of the current transformer is reserved in the installation box.

The rotor is a copper bar rotor, and the sound-absorbing layer is sound-absorbing cotton.

The beneficial effects of the utility model:

1. In order to reduce the center height of the motor in this utility model, the cooler adopts a winding air intake structure with a compact structure and air intake from the bottom of the cooler. The air intake structure includes an outer sound-absorbing assembly arranged along the width direction of the cooler. The outer sound-absorbing assembly consists of It is composed of an inverted U-shaped outer baffle and a sound-absorbing layer fixed on the inner side of the outer baffle. The inverted U-shaped outer baffle can effectively change the air flow direction entering the air intake structure, and the sound-absorbing layer fixed on the inner side of the outer baffle can effectively absorb the air flowing through it. Air noise, so the air intake structure can achieve better noise reduction effect. The air outlet structure of the utility model includes an inner sound-absorbing assembly arranged along the length direction of the cooler. The inner sound-absorbing assembly is composed of a bat-wing-shaped inner baffle and a sound-absorbing layer fixed inside the inner baffle. The bat-wing-shaped inner baffle The air flow direction from the machine base into the air outlet structure is changed to reduce the air flow velocity; the sound-absorbing layer fixed inside the inner baffle can effectively absorb the noise flowing through the air, so the air outlet structure can also achieve better noise reduction effect.

2. In the utility model, a wind-shielding structure is fixedly arranged at the end of the winding coil, and the wind-shielding structure includes a wind-shielding ring arranged in the inner circle of the winding coil and coaxial with the stator core. The windshield ring is bound at the end of the winding coil by glass glue. This structure has dual purposes of the end collar and the windshield, making full use of the space at the end of the winding coil, effectively reducing the wind resistance and ventilation loss of the inner air path, and improving the The ventilation and heat dissipation effect of the internal air passage reduces the temperature rise of the motor.

Description of drawings

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

Fig. 2 is a sectional view along A-A direction of Fig. 1;

Fig. 3 is the front view of the inner fan in the utility model;

Fig. 4 is a sectional view along BB of Fig. 3;

Fig. 5 is the front view of end cap in the utility model;

Fig. 6 is a sectional view along CC of Fig. 3;

Fig. 7 is the front view of the windshield ring in the utility model;

Fig. 8 is a schematic structural view of the junction box in the present invention.

The arrows in Figures 1 and 2 indicate the direction of air flow.

Detailed ways

The implementation of the present utility model is illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present utility model from the content disclosed in this specification. It should be noted that the structures, proportions, sizes, etc. shown in the drawings of this specification are only used to match the content disclosed in the specification, for those who are familiar with this technology to understand and read, and are not used to limit the implementation of the utility model. Conditions, so it has no technical substantive meaning, any modification of structure, change of proportional relationship or adjustment of size should still fall within the scope of this utility model without affecting the effect and purpose of this utility model. within the scope covered by the technical content disclosed in the new model. At the same time, terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit this specification. The practicable range of the utility model, and the change or adjustment of its relative relationship, without any substantial change in the technical content, shall also be regarded as the practicable scope of the utility model.

As shown in Figures 1 to 8, a low-center, high-capacity, three-phase asynchronous motor includes a frame 1 and a cooler 2 fixed above the frame 1. A rotor 3 and a stator core 4 are arranged in the frame 1, and the rotor 3 is the copper bar rotor. The cooler 2 includes an air inlet structure located at both ends of the cooler 2 and an air outlet structure located in the middle of the cooler 2. The air inlet structure includes an outer air inlet 5 and an outer air outlet 6. The outer air outlet 6 is arranged at the bottom of the cooler 2 and is located at the outer inlet. The inner side of the tuyere 5 corresponds to the air outlet of the machine base 1; the air outlet structure includes an inner air inlet 7 arranged on the bottom of the cooler 2 and corresponding to the air outlet of the machine base 1 and arranged on the side corresponding to the air outlet structure of the cooler 2 The two inner air outlets 8 on the wall are located above the inner air inlet 7 . The outside air enters the air inlet structure and enters the inside of the base 1 through the outer air outlet 6 to cool the rotor 3 and the stator core 4, and the air coming out of the inside of the base 1 flows into the outside through the inner air outlet 8 of the air outlet structure. Since the customer requires the center height of the three-phase asynchronous motor to be relatively low, the height of the cooler 2 is also reduced accordingly, so the conventional air intake structure that can reduce noise cannot be installed and arranged. In order to reduce the height of the cooler 2 while still making the air intake structure play a role in noise reduction, the air intake structure also includes a curved outer deflector 10 arranged along the width direction of the cooler 2, that is, the outer surface of the air intake structure The air inlets 5 are all set at the bottom of the cooler 2 and outside the machine base 1. The outside air enters the air inlet structure from the outer air inlet 5 and then rotates 180° into the machine base 1. After the air changes flow direction many times, the flow rate decreases. Larger, so the noise will be reduced more. The air outlet structure also includes an inner deflector 11 arranged along the length direction of the cooler 2 .

The cooler 2 includes a top cover 9, two air inlet structures are symmetrically arranged at both ends inside the top cover 9, and an air outlet structure is arranged in the middle of the top cover 9 and is located between the two air inlet structures. The outer deflector 10 is in the shape of an inverted U, and the inside of the outer deflector 10 is provided with a sound-absorbing layer 12; the inner deflector 11 is in the shape of a bat wing, and the inner deflector 11 is composed of two arc plates 13, and the two arcs The lower ends of the plates 13 are combined to form a guide end corresponding to the middle of the air outlet of the machine base 1, the upper ends of the two arc plates 13 face the inner air outlet, and the inner sides of the two arc plates 13 are provided with a sound-absorbing layer 12, which is a sound-absorbing layer. cotton. The inverted U-shaped outer deflector 10 can effectively change the flow direction of the air entering the air intake structure, and the sound-absorbing layer 12 fixed on the inner side of the outer deflector 10 can effectively absorb the noise flowing through the air, so the air intake structure can achieve better noise reduction Noise reduction effect. The batwing-shaped inner deflector 11 changes the air flow direction from the air outlet of the machine base 1 into the air outlet structure, reducing the air flow velocity; the sound-absorbing layer 12 fixed on the inside of the two arc plates 13 can effectively absorb the noise flowing through the air, so The air outlet structure can also achieve better noise reduction effect. Therefore, the noise of the electric motor of the utility model can reach a lower value.

Two inner fans 15 symmetrically fixed on both ends of the rotor 3 are also arranged in the frame 1, the inner fans 15 are centrifugal inner fans, and the inner fans 15 are fixed on the copper bars 16 of the rotor by bolts. The inner fan 15 is a centrifugal inner fan, which makes the air in the machine base 1 flow in the radial direction and improves the cooling effect.

The front end of the machine base 1 is provided with an end cover 17, and the end cover 17 is welded by a flange 18, a support plate 19 and a cover plate 20, and the support plate 19 is fixed between the flange plate 18 and the cover plate 20. The cover plate 20 is composed of a first annular plate 21 on the outer side and a second annular plate 22 on the inner side, the first annular plate 21 and the second annular plate 22 are coaxial, and the second annular plate 22 is fixed In the central hole of the first annular plate 21 , the axial width of the second annular plate 22 is greater than the axial width of the first annular plate 21 . The flange 18, the support plate 19, the first annular plate 21 and the second annular plate 22 are all processed by steel plates, the thickness of the first annular plate 21 is 25~30mm, and the thickness of the second annular plate 22 is 28 mm. ~33mm, the first annular plate 21 and the second annular plate 22 are connected by welding. The end cover 17 is formed by welding the flange 18, the support plate 19, the first annular plate 21 and the second annular plate 22 made of steel plate. The steel plate end cover has better vibration absorption and can reduce the vibration, and does not need to re-open the mold, which is convenient for production and processing, and avoids increasing costs.

The stator core 4 is provided with a winding coil 23, and the end of the winding coil 23 is fixedly provided with a wind-shielding structure. 24 is provided with a plurality of fixing grooves 14 evenly spaced in the inner circumference direction, and the fixing grooves 14 are convenient for fixing the windshield ring 24 . The windshield ring 24 is made of glass fiber board, which is bound to the end of the winding coil 23 by glass glue. The windshield ring 24 is bound to the end of the winding coil 23 with glass glue. This structure has both the dual purpose of the end collar and the windshield, making full use of the end space of the winding coil 23 and effectively reducing the wind resistance and ventilation loss of the inner air path , Improve the ventilation and heat dissipation effect of the inner air passage, and reduce the temperature rise of the motor.

The base 1 is also provided with a junction box 25, the junction box 25 includes an installation box 26 with a cable inlet and three insulators 27, and the three insulators 27 are all installed in the installation box 26, and a current mutual inductance is reserved in the installation box 26. The installation position of the device 28.

The outside air enters the air inlet structure through the outer air inlet 5 and rotates 180°, then enters the inside of the machine base 1 through the outer air outlet 6 to cool the rotor 3 and stator core 4, and the air coming out of the inside of the machine base 1 passes through the inside of the air outlet structure. The air outlet 8 flows into the outside world. When the outside air enters the air intake structure from the outer air inlet 5 and then rotates 180° to enter the machine base 1, the inverted U-shaped outer deflector 10 can change the air flow direction many times, and the flow velocity is greatly reduced, so it is fixed at the outer deflector. The sound-absorbing layer 12 inside the board 10 can effectively absorb the noise flowing through the air, so the air-intake structure can achieve better sound-absorbing and noise-reducing effects. The batwing-shaped inner deflector 11 changes the air flow direction from the air outlet of the machine base 1 into the air outlet structure, reducing the air flow velocity; the sound-absorbing layer 12 fixed on the inside of the two arc plates 13 can effectively absorb the noise flowing through the air, so The air outlet structure can also achieve better noise reduction effect. Therefore, the noise of the electric motor of the utility model can reach a lower value.

In this embodiment, the height of the cooler 2 is reduced under the premise of lower noise by adopting an inverted U-shaped meander outer deflector 10 . In order to reduce the center height of the three-phase asynchronous motor, the height of the frame in this embodiment is also reduced accordingly, so the original wind-shielding structure is abandoned, and a relatively small-sized wind-shielding ring 24 is adopted.

The above-mentioned embodiments only illustrate the principles and effects of the present utility model, but are not intended to limit the present utility model. Anyone familiar with this technology can modify or change the above-mentioned embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or changes made by those with ordinary knowledge in the technical field without departing from the spirit and technical ideas disclosed in the utility model should still be covered by the claims of the utility model.

Claims (10)

1. a kind of high large capacity threephase asynchronous in low center, including engine base and the cooler being fixed on above engine base, engine base It is inside provided with rotor and stator core, cooler includes the air inlet structure positioned at cooler both ends, going out in the middle part of cooler Wind structure, air inlet structure include external air inlet port and outgoing tuyere, and outgoing tuyere is arranged in cooler bottom, positioned at external air inlet port Inside is simultaneously corresponding with engine base air outlet, air exhausting structure include be arranged on cooler bottom and it is corresponding with engine base air outlet in into Air port and two interior air outlets being arranged on the side wall corresponding to the air exhausting structure of cooler, two interior air outlets be respectively positioned in into The top in air port, outside air enter after air inlet structure and enter base inner to rotor and stator core progress by outgoing tuyere Cooling, the air come out from base inner flows into extraneous by the interior air outlet of air exhausting structure, it is characterised in that：Air inlet structure is also Include the deflector outside the Qu Lu that cooler width direction is arranged, the external air inlet port of air inlet structure is respectively positioned on cooler bottom and position In the outside of engine base, outside air rotates 180 ° after entering air inlet structure from external air inlet port and enters in engine base；Air exhausting structure also wraps Include the inner deflector arranged along cooler length direction.

2. the high large capacity threephase asynchronous in low center according to claim 1, it is characterised in that：The cooler packet Overhead guard is included, two air inlet structures are arranged symmetrically in the both ends inside overhead guard, and air exhausting structure is arranged in the middle part of overhead guard and is located at two Between air inlet structure；The outer deflectors of Qu Lu are inverted U shape, and noise reduction layer is equipped on the inside of the outer deflectors of Qu Lu；Inner deflector is in batswing tab Shape, inner deflector is by two arc board groups at the lower end of two arc plates merges to form water conservancy diversion corresponding in the middle part of engine base air outlet End, towards interior air outlet, two arc plates insides are equipped with noise reduction layer for the upper end of two arc plates.

3. the high large capacity threephase asynchronous in low center according to claim 2, it is characterised in that：In the engine base also If there are two the internal fans for being symmetrically fixed on two ends of rotor.

4. the high large capacity threephase asynchronous in low center according to claim 3, it is characterised in that：The internal fan is Centrifugal internal fan, centrifugal internal fan are bolted on rotor bar.

5. the high large capacity threephase asynchronous in low center according to claim 1 or 2, it is characterised in that：The engine base Front end is equipped with end cap, and end cap is welded by ring flange, support plate and cover board, and support plate is installed between ring flange and cover board, The cover board is made of the first annular plate positioned at outside and the second annular plate positioned inside, the first annular plate and the second ring-type Plate coaxial line, the second annular plate are fixed in the first annular plate centre bore, and the width of the second annular plate in an axial direction is more than the first ring The width of shape plate in an axial direction.

6. the high large capacity threephase asynchronous in low center according to claim 5, it is characterised in that：Ring flange, support Plate, the first annular plate and the second annular plate are process by steel plate, and the first cyclic annular plate thickness is 25 ~ 30mm, the second annular plate Thickness is 28 ~ 33mm, and the first annular plate and the second annular plate are welded to connect.

7. the high large capacity threephase asynchronous in low center according to claim 1, it is characterised in that：It is set in stator core It is equipped with winding coil, the end of winding coil is fixedly installed wind shielding structure, and wind shielding structure includes being arranged in winding coil inner circle And the coaxial wind loop with stator core.

8. the high large capacity threephase asynchronous in low center according to claim 7, it is characterised in that：The material of wind loop For glass mat, bound in winding coil end with glass cement.

9. the high large capacity threephase asynchronous in low center according to claim 1, it is characterised in that：It is additionally provided on engine base Terminal box, terminal box include mounting box and three insulators equipped with cable inlet, and three insulators are installed in mounting box, The installation site of current transformer is reserved in mounting box.

10. the high large capacity threephase asynchronous in low center according to claim 2, it is characterised in that：Institute's rotor is copper Rotor, noise reduction layer is acoustical cotton.