CN107994732A - A kind of high power density large-size machine forced ventilation cooling structure - Google Patents

Abstract

The invention discloses a forced ventilation cooling structure for a large motor with high power density, which includes a stator and a rotor. The stator and the rotor are both provided with air passages, and a first fan is coaxially arranged at the non-output end of the rotor. The first fan is For a centrifugal fan, an air-to-air cooling structure is provided outside the stator, and the air-to-air cooling structure includes a casing, and a heat exchange space is formed between the casing and the stator. The casing is provided with an air inlet and an air outlet. The tuyere and the air inlet are communicated through a plurality of heat exchange tubes, and the plurality of heat exchange tubes pass through the heat exchange space. Through the organic combination of the first fan and the air-to-air cooling structure, heat transfer and heat dissipation are realized, which ensures that the temperature of the internal rotor and stator of the motor is within the allowable range, thereby ensuring the normal operation of the motor.

Description

A forced ventilation cooling structure for large motors with high power density

technical field

The invention belongs to the technical field of motors, and relates to motor cooling and ventilation technologies, in particular to a ventilation and heat dissipation structure for large motors with high power density.

Background technique

At present, the main trend of motor technology is to develop in the direction of large capacity and high power density. The main feature of large-capacity, high-power-density motors is high electromagnetic load, and the power generated per unit volume is 1.5 times that of ordinary motors. At the same time, it is accompanied by an increase in heat generation, which limits the development of high-power-density motor capacity. . Therefore, the ventilation and heat dissipation of high power density motors is one of the primary topics of research. According to the engineering practice of domestic large motor technology, the design of ventilation and heat dissipation of low-speed, large-capacity, high-power-density motors is difficult, which has always been one of the core problems that plague technicians.

In view of the high power density motor's concentrated heating area and large heat generation, the motor design must increase the air volume of the motor's internal air path, but affected by the low speed of the motor, the size and number of internal fans must be increased. The invention patent with the application number CN201320211541.X discloses a motor with an air-cooling mechanism, including a motor body, a cylindrical heat dissipation shell is fixed at one end of the motor body, and the inner end of the heat dissipation shell is located in the middle of the motor body , the outer end extends at least to the end of the motor body, and a heat dissipation channel is formed between the outside of the motor body and the inside of the heat dissipation housing. It is characterized in that a fan mounting seat is fixed at the outer end of the heat dissipation housing, and a For the fan, the heat dissipation housing is provided with a signal socket, a fan power socket and a motor power socket. Although the heat dissipation problem has been solved to a certain extent, there are still problems of increased motor length, low heat dissipation efficiency, and increased volume, and the external dimensions of the motor cannot meet the high power density and small size.

Contents of the invention

In view of the above problems, the present invention provides a forced ventilation cooler structure, which ensures good ventilation and heat dissipation effects of the motor, meets the ventilation and heat dissipation requirements of high power density motors, and is safe and reliable in operation.

In order to achieve the above object, the following technical solutions are adopted.

A forced ventilation cooling structure for a large motor with high power density, including a stator and a rotor, the stator and the rotor are both provided with air passages, and a first fan is coaxially arranged at the non-output end of the rotor, and the first fan is For a centrifugal fan, an air-to-air cooling structure is provided on the outside of the stator. The air-to-air cooling structure includes a casing that covers the outside of the stator. A cylindrical heat exchange space is formed between the casing and the stator. On the casing An air inlet and an air outlet are provided, the air inlet is provided with a second fan, the air outlet communicates with the air inlet through a heat exchange tube, and the air outlet and the air inlet pass through multiple A plurality of heat exchange tubes are arranged in an array and pass through the heat exchange space around the stator.

The second fan is fixed on the end of the casing close to the first fan, the second fan is a centrifugal fan, the air inlet is provided with a guide cover, and the second fan blade of the second fan is located at the guide entrance to the flow hood. This horizontal installation method makes the noise of the second fan low and the air volume is large, so that the air in the external air path flows through the heat exchange tubes smoothly, takes away the heat of the heat exchange tubes, and transfers the heat inside the motor; in addition, The second blower fan and the casing are firmly installed and fixed to reduce vibration.

Two partitions parallel to each other are arranged inside the casing, and the two partitions are located on both sides of the stator to divide the heat exchange space into three cavity spaces. The opening corresponding to the first fan blade, the heat exchange tube passes through the partition plate and is sealingly connected with the partition plate.

The shell of the air-to-air cooling structure is provided with a connecting flange near the output end of the rotor, and is fixed on the machine base of the motor through the connecting flange.

A deflector is arranged inside the deflector, and there is at least one deflector, which is evenly distributed in the deflector. The flow of outside air entering the shroud can be reasonably distributed and then flow to the cooling pipe, so that the maximum heat dissipation effect of the cooling pipe can be exerted.

Two diametrically opposite observation windows are arranged on the outer side of the air-to-air cooling structure. The operating status of the centrifugal fan can be monitored at any time to ensure the safe operation of the centrifugal fan.

The first fan and the second fan on the air-to-air cooling structure operate independently. The internal air path of the air-to-air cooling structure: under the action of the first fan, the air in the centrifugal fan is pressed into the heat exchange space, and the air flows downward along the ventilation cavity, passes through the heat exchange tube and then enters the other end of the rotor. Due to the negative pressure zone formed under the first fan, the hot air in the stator flows to the middle chamber of the heat exchange space, flows upward through the heat exchange tube, passes through the first fan, and flows into the two air chambers outside the heat exchange space respectively. During the air circulation process of the air circuit inside the air-to-air cooling structure, the hot air flowing out from the rotor and stator passes through the heat exchange tubes, and then the heat is transferred to the heat exchange tubes. Air is passed to the heat exchange tubes.

External air path of air-to-air cooling structure: under the action of the second fan, the air outside the motor enters the shroud axially, enters the heat exchange tube through the air inlet along the shroud, and flows out from the other end of the heat exchange tube. Because the temperature of the outside air is lower than that of the heat exchange tubes, the heat in the heat exchange space is transferred to the outside air flowing through the heat exchange tubes, and the heat from the heat exchange tubes is continuously taken out by the outside air.

Through the organic combination of the inner air path and the outer air path, the inner air path realizes heat transfer, and the outer air path realizes heat dissipation, which ensures that the temperature of the internal rotor and stator of the motor is within the allowable range, thereby ensuring the normal operation of the motor. When there is a problem with a component in the air-to-air cooling structure, the problematic component can be removed from the air-to-air cooling structure by simply removing the fastening bolts of each component, which is convenient for disassembly and maintenance.

Description of drawings

Fig. 1 is the structural representation of embodiment.

Detailed ways

The implementation of the present invention will be illustrated by specific specific examples below, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification.

See Figure 1. The structures, proportions, sizes, etc. shown in the drawings attached to this specification are only used to match the content disclosed in the specification for the understanding and reading of those who are familiar with this technology, and are not used to limit the conditions for the implementation of the present invention , so it has no technical substantive meaning, and any modification of structure, change of proportional relationship or adjustment of size shall still fall within the scope of the disclosure of the present invention without affecting the functions and objectives of the present invention. within the range covered by the technical content. 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 scope of the invention and the change or adjustment of its relative relationship shall also be regarded as the practicable scope of the present invention without any substantial change in the technical content.

As shown in Figure 1, a forced ventilation cooling structure of a large motor with high power density includes a stator 1 and a rotor 2, the stator 1 and the rotor 2 are provided with air ducts, and are coaxially arranged at the non-output end of the rotor 2 There is a first fan 4, the first fan 4 is a centrifugal fan, the outside of the stator 1 is provided with an air-to-air cooling structure 3, and the air-to-air cooling structure 3 includes a casing 31 sleeved on the outside of the stator 1, the casing 31 and the stator 1 form a cylindrical heat exchange space, the housing 31 is provided with an air inlet 32 and an air outlet 33, the air inlet 32 is provided with a second fan 5, and the air outlet 33 and The air inlets 32 communicate with each other through a plurality of heat exchange tubes 34 , and the plurality of heat exchange tubes 34 are arranged in an array to bypass the stator 1 and pass through the heat exchange space.

The second fan 5 is fixed on the end of the housing 31 close to the first fan 4, the second fan 5 is a centrifugal fan, the air inlet 32 is provided with a shroud 6, and the second fan 5 The second fan blade 51 is located at the inlet of the wind deflector 6 .

The housing 31 is provided with two partitions 35 parallel to each other. The two partitions 35 are located on both sides of the stator 1 to divide the heat exchange space into three cavity spaces. The partitions 35 are provided with The opening corresponding to the first fan blade 41 of the first fan 4 , the heat exchange tube 34 passes through the partition plate 35 and is sealingly connected with the partition plate 35 .

The casing 31 of the air-to-air cooling structure 3 is provided with a connecting flange 7 at the end close to the output end of the rotor 2 , and is fixed on the frame of the motor through the connecting flange 7 .

The deflector 61 is provided inside the deflector 6 , and the deflector 61 is provided in multiples and evenly distributed in the deflector 6 . The flow of outside air entering into the shroud 6 can be reasonably distributed and then flow to the cooling pipe, so that the maximum heat dissipation effect of the cooling pipe can be exerted.

Two diametrically opposite observation windows 8 are provided on the outer side of the air-to-air cooling structure 3 . The operating status of the centrifugal fan can be monitored at any time to ensure the safe operation of the centrifugal fan.

The first fan 4 and the second fan 5 on the air-to-air cooling structure 3 operate independently. The internal air path of the air-to-air cooling structure 3: under the action of the first fan 4, the air in the centrifugal fan is pressed into the heat exchange space, and the air flows downward along the ventilation cavity, and then enters the other part of the rotor 2 through the heat exchange tube 34 one end. Due to the negative pressure area formed under the centrifugal fan 7, the hot air in the stator 1 flows to the middle chamber of the heat exchange space, flows upward through the heat exchange tube 34, passes through the first fan 4, and flows into the two air chambers outside the heat exchange space respectively . During the air circulation process of the internal air passage of the air-to-air cooling structure 3, the hot air flowing out from the rotor 2 and the stator 1 passes through the heat exchange tube 34, and the heat is transferred to the heat exchange tube 34. The heat generated inside is transferred to the heat exchange tubes 34 by the air.

Air-to-air cooling structure 3 external air path: Under the action of the second fan 5, the air outside the motor axially enters the shroud 6, enters the heat exchange tube 34 through the air inlet 32 along the shroud 6, and flows from the heat exchange tube 34 flow out from the other end. Because the temperature of the outside air is lower than that of the heat exchange tubes 34, the heat in the heat exchange space is transferred to the outside air flowing through the heat exchange tubes 34, and the heat from the heat exchange tubes 34 is continuously taken out by the outside air.

Through the organic combination of the inner air path and the outer air path, the inner air path realizes heat transfer, and the outer air path realizes heat dissipation, which ensures that the temperature of the internal rotor 2 and stator 1 of the motor is within the allowable range, thereby ensuring the normal operation of the motor. When there is a problem with a part in the air-to-air cooling structure 3, the problematic part can be removed from the air-to-air cooling structure 3 by simply dismantling the fastening bolts of each part, which is convenient for disassembly and maintenance.

The above-mentioned embodiments only illustrate the principles and effects of the present invention, but are not intended to limit the present invention. Anyone skilled in the art 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 skilled in the art without departing from the spirit and technical ideas disclosed in the present invention should still be covered by the claims of the present invention.

Claims (6)

1. A large-scale motor with high power density forced ventilation cooling structure, comprising a stator and a rotor, the stator and the rotor are all provided with air ducts, and the non-output end of the rotor is coaxially provided with a first blower fan, characterized in that: The first fan is a centrifugal fan, and an air-to-air cooling structure is provided outside the stator. The air-to-air cooling structure includes a casing that covers the outside of the stator, and a cylindrical heat exchange is formed between the casing and the stator. space, the housing is provided with an air inlet and an air outlet, the air inlet is provided with a second fan, and the air outlet and the air inlet are communicated through a plurality of heat exchange tubes, and the plurality of heat exchange tubes Arranged in an array and pass through the heat exchange space. 2. The forced ventilation cooling structure for a large motor with high power density according to claim 1, characterized in that: the second fan is fixed on the end of the casing close to the first fan, and the second fan is a centrifugal fan, so A wind deflector is provided on the air inlet, and the second fan blade of the second fan is located at the entrance of the wind deflector. 3. According to claim 2, the forced ventilation cooling structure of a large motor with high power density is characterized in that: a deflector is arranged inside the deflector, and at least one deflector is evenly distributed on the deflector. flow hood. 4. According to claim 1, the forced ventilation cooling structure of a large-scale motor with high power density is characterized in that: two partitions parallel to each other are arranged inside the housing, and the two partitions are located on both sides of the stator to separate the The thermal space is divided into three cavities, the partition is provided with an opening corresponding to the first fan blade of the first fan, the heat exchange tube passes through the partition and is sealed with the partition connect. 5. According to claim 1, the forced ventilation cooling structure for large motors with high power density is characterized in that: the end of the housing of the air-to-air cooling structure close to the output end of the rotor is provided with a connecting flange, and is fixed on the on the motor frame. 6. According to any one of claims 1 to 5, the forced-air cooling structure for a large-scale motor with high power density is characterized in that two diametrically opposite observation windows are provided on the outer side of the air-to-air cooling structure.