Air compressor unit

Abstract

The utility model provides an air compressor unit which comprises a unit shell, an air compressor and a refrigerant refrigeration assembly, a containing space is arranged in the unit shell, the air compressor and the refrigerant refrigeration assembly are both located in the containing space, the air compressor comprises a driving motor part, and the driving motor part is provided with a motor sealing shell. The motor sealing shell is provided with a sealing cavity, the refrigerant refrigerating assembly comprises a refrigerant compressor, a condenser and a throttling element, the condenser is communicated between an exhaust port of the refrigerant compressor and the throttling element, a refrigerant inlet and a refrigerant outlet are formed in the motor sealing shell, and a refrigerant flowing out of the throttling element is introduced into the sealing cavity through the refrigerant inlet. And the refrigerant entering the sealing cavity exchanges heat with components in the sealing cavity and then is sucked into the refrigerant compressor through the refrigerant outlet. According to the utility model, a cooling flow channel does not need to be arranged in the motor shell, the design difficulty can be obviously reduced, and the motor shell does not need to be manufactured through mold opening, so that the manufacturing cost is reduced, and the refrigeration performance is higher.

Description

TECHNICAL FIELD

[0001] The utility model belongs to air compression equipment technical field, concretely relates to a kind of air compressor unit. BACKGROUND

[0002] Magnetic suspension centrifugal air compressor is high in rotational speed, generally above 30000RPM, and the heat generation of stator and rotor is extremely high, so there is a high requirement for the heat dissipation design of air compressor. At present, the mainstream heat dissipation mode basically adopts the form of water cooling plus air cooling. Among them, water cooling is mainly for heat dissipation of stator core, and air cooling is for heat dissipation of stator coil (i.e. stator winding) and rotor inside the compressor. Some existing technologies also use pure air cooling heat dissipation scheme, using high-flow fan to air cool and dissipate heat for stator and rotor inside the motor.

[0003] For example, the patent with publication number CN113833682A discloses a magnetic suspension air compressor, which discloses the heat dissipation mode of magnetic suspension motor in the whole machine system. The motor has a motor air inlet connected with the air outlet of the centrifugal fan on one side, and a motor air outlet connected with the heat dissipation air tank on the upper end. The heat dissipation air tank is provided with an air outlet connected with the outside of the machine box. The utility model has the effect of effectively reducing the heat inside the magnetic suspension motor. However, this scheme uses air cooling for heat dissipation only, which has a very high requirement for heat dissipation inside the motor, and it is difficult to effectively dissipate heat inside the stator winding.

[0004] The patent with publication number CN116317302A discloses a cooling structure of magnetic suspension centrifugal compressor motor. In this patent, the magnetic suspension centrifugal compressor adopts air cooling plus water cooling. The stator is provided with a heat dissipation area connected with the heat dissipation gap at both ends. The shell is fixedly provided with an air inlet and an air outlet connected with the heat dissipation area. The shell is internally provided with a water cooling flow channel. The shell is fixedly provided with a water inlet and a water outlet connected with the water cooling flow channel. The utility model has the advantages of air cooling and water cooling combined for heat dissipation, which can improve the cooling efficiency of the magnetic suspension motor to a certain extent. Based on the foregoing advantages, this scheme is the mainstream heat dissipation scheme for magnetic suspension air compressor at present. However, this scheme is complex in design, and the motor shell needs to be provided with a cooling flow channel, which is difficult to design and has high mold opening cost. UTILITY MODEL CONTENTS

[0005] Therefore, the utility model provides an air compressor unit, which can overcome the technical problems of poor heat dissipation effect of air compressor unit, especially high-speed magnetic suspension air compressor unit, or the need for cooling flow channel in the motor shell, which is difficult to design and has high mold opening cost in the related art.

[0006] In order to solve the above problems, the utility model provides a kind of air compressor unit, including unit shell, air compressor and refrigerant refrigeration component, the unit shell has accommodating space inside, the air compressor and the refrigerant refrigeration component are all in the accommodating space, the air compressor includes air compression part and the drive motor part for driving the air compression part compressed air, the drive motor part has motor sealing shell, the motor sealing shell has the sealing cavity of assembly motor stator and motor rotor, the refrigerant refrigeration component includes refrigerant compressor, condenser and throttling element, the condenser is communicated between the air outlet of the refrigerant compressor and the inlet of the throttling element, refrigerant inlet and refrigerant outlet are structured on the motor sealing shell, the refrigerant that the throttling element flows out can be introduced into the sealing cavity via the refrigerant inlet, the refrigerant in the sealing cavity can be sucked into the refrigerant compressor via the refrigerant outlet after heat exchange with the components in the sealing cavity.

[0007] In some embodiments, a refrigerant storage tank is provided between the refrigerant outlet and the suction port of the refrigerant compressor; or the air compressor is a magnetic levitation air compressor.

[0008] In some embodiments, the refrigerant refrigeration component further includes an evaporator, which is communicated between the outlet of the throttling element and the refrigerant inlet, and the evaporator can cool the frequency converter of the air compressor and / or the unit main control component of the air compressor unit.

[0009] In some embodiments, the evaporator has a back plate with a cooling flow channel formed inside, and the frequency converter and the unit main control component are assembled on the back plate.

[0010] In some embodiments, the evaporator is configured with a first fan, which can drive air to flow into the accommodating space via the evaporator.

[0011] In some embodiments, the condenser is configured with a second fan, which can drive the air flow in the accommodating space to be discharged outside the unit shell.

[0012] In some embodiments, the unit shell is formed with an electrical cabinet separated from the accommodating space, and the frequency converter and the unit main control component are both assembled in the electrical cabinet.

[0013] In some embodiments, a ventilation opening is provided between the electrical cabinet and the accommodating space.

[0014] In some embodiments, the refrigerant refrigeration component further includes a gas-liquid separator, which is communicated between the refrigerant outlet of the evaporator and the refrigerant inlet.

[0015] In some embodiments, the condenser is arranged at a top region of the accommodating space, and an air outlet direction of the condenser is from bottom to top.

[0016] The air compressor unit has the following beneficial effects:

[0017] By arranging the refrigerant cooling assembly in the air compressor unit, the low-temperature and low-pressure gaseous refrigerant is introduced into the motor sealing shell of the motor driving part of the air compression air, thereby achieving efficient cooling of each related component in the motor driving part, and only the refrigerant inlet and the refrigerant outlet need to be arranged on the motor sealing shell under the premise of ensuring the sealing property of the motor sealing shell, without the need of arranging a cooling flow channel in the motor shell, thereby significantly reducing the design difficulty and the need of opening the mold to manufacture the motor shell, and thus reducing the manufacturing cost.

[0018] By arranging the refrigerant storage tank between the refrigerant outlet and the suction port of the refrigerant compressor, the liquid phase part of the refrigerant flowing out after heat exchange with the components in the motor sealing shell can be stored, and the gas phase part is sucked into the refrigerant compressor, that is, the liquid strike phenomenon caused by liquid suction of the refrigerant compressor is prevented.

[0019] By arranging the evaporator between the throttling element and the refrigerant inlet, the evaporator is used to form efficient heat dissipation of the frequency converter and the main control components of the unit, thereby effectively preventing the temperature of the heating components in the frequency converter and the main control components of the unit from being too high.

[0020] The first fan is arranged for the evaporator, and the airflow cooled by the evaporator is driven into the accommodating space by the rotating first fan, thereby achieving efficient cooling of each component in the accommodating space, such as the air compressor, the refrigerant compressor and the like.

[0021] The technical scheme of the utility model adopts the global refrigerant circulation cooling design, uses the gas-liquid phase change of the refrigerant, and uses the refrigerant in different states for heat dissipation of the air compressor, the frequency converter and the main control components of the unit, and the effect of optimizing the internal heat dissipation of the whole machine can be achieved. BRIEF DESCRIPTION OF DRAWINGS

[0022] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or prior art description. The drawings in the following description are only exemplary, and for those skilled in the art, other drawings can be derived from the provided drawings without creative labor.

[0023] Figure 1 is a schematic diagram of the three-dimensional structure of the air compressor unit in the embodiment of the present application (the hidden part is the unit shell, such as the chamber sealing door);

[0024] Figure 2 is Figure 1 a schematic diagram of the three-dimensional structure of the air compressor unit in another view in the embodiment of the present application;

[0025] Figure 3 is Figure 2 a partial enlarged view of A in the embodiment of the present application;

[0026] Figure 4 is Figure 1 a schematic diagram of the three-dimensional structure of the air compressor unit in another view in the embodiment of the present application;

[0027] Figure 5 is Figure 1 a left view of the air compressor unit in the embodiment of the present application (the front view of the electrical cabinet is shown, and the sealing door of the electrical cabinet is omitted in the figure);

[0028] Figure 6 is a schematic diagram of the refrigerant phase change process of the refrigerant refrigeration assembly in the embodiment of the present application.

[0029] The reference signs are:

[0030] 1, unit shell; 10, unit main control component; 11, air vent; 2, air compressor; 20, frequency converter; 21, motor sealing shell; 211, refrigerant inlet; 212, refrigerant outlet; 31, refrigerant compressor; 32, condenser; 321, second fan; 33, throttling element; 34, refrigerant storage tank; 35, evaporator; 351, first fan; 36, gas-liquid separator. DETAILED DESCRIPTION

[0031] The technical solutions in the embodiments of the present application will be clearly and completely described with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. The description of the at least one exemplary embodiment is merely illustrative in nature and by no means as any limitation to the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the present application.

[0032] In the description of the present application, it should be understood that the orientation words such as "front, back, up, down, left, right", "horizontal, vertical, perpendicular, horizontal" and "top, bottom" and the like indicate the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and in the absence of the opposite description, these orientation words do not indicate and imply that the indicated device or element must have a specific orientation or be constructed and operated in a specific orientation, therefore it cannot be understood as a limitation to the protection scope of the present application; the orientation words "inner, outer" refer to the inner and outer of the contour of each component itself.

[0033] For the convenience of description, spatial relative terms such as "on", "above", "upper surface", "upper" and the like can be used to describe the spatial positional relationship of one device or feature with other devices or features as shown in the drawings. It should be understood that the spatial relative terms are intended to include different orientations in use or operation in addition to the orientation of the device described in the drawings. For example, if the device in the drawings is inverted, the device described as "above" or "on" other devices or structures will be positioned "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below" orientations. The device can also be positioned in other different ways (rotated 90° or in other orientations), and the spatial relative descriptions used herein are interpreted accordingly.

[0034] In addition, it should be noted that the use of "first", "second" and the like to define parts is only for the convenience of distinguishing the corresponding parts, and the above words have no special meaning unless otherwise stated, therefore it cannot be understood as a limitation to the protection scope of the present application.

[0035] Referring to Figures 1 to 6As shown, according to the embodiment of the utility model, provide a kind of air compressor unit, including unit shell 1, air compressor 2 and refrigerant refrigeration component (not marked in drawing), the unit shell 1 there is accommodating space (not marked in drawing) inside, the air compressor 2 and the refrigerant refrigeration component are all in the accommodating space, the air compressor 2 includes air compression part (not marked in drawing) and the drive motor part (not marked in drawing) for driving the air compression part compressed air, the drive motor part has motor sealed shell 21, the motor sealed shell 21 has the sealing cavity of assembly motor stator (not marked in drawing) and motor rotor (not marked in drawing), it can be understood that the stator coil of motor stator will generate magnetic field after current is passed and further drive motor rotor rotates, motor rotor drives the impeller in air compression part assembled in its end compressed air, when the air compressor 2 is magnetic levitation air compressor, the rotating shaft of motor rotor is supported in motor sealed shell 21 by magnetic levitation bearing (not shown in drawing, generally includes magnetic levitation radial bearing and axial bearing, of course, can also be magnetic levitation composite bearing), the refrigerant refrigeration component includes refrigerant compressor 31, condenser 32 and throttling element 33 (specific example such as electronic expansion valve), the condenser 32 is communicated between the exhaust port of refrigerant compressor 31 and the inlet of throttling element 33, the motor sealed shell 21 is structured with refrigerant inlet 211 and refrigerant outlet 212, the refrigerant that the throttling element 33 flows out can be introduced into the sealing cavity via the refrigerant inlet 211, the refrigerant in the sealing cavity can be sucked into the refrigerant compressor 31 via the refrigerant outlet 212 after heat exchange with the components in the sealing cavity, the components in the sealing cavity are specific, such as the motor rotor, motor stator, magnetic levitation bearing and other components mentioned above, in some cases, also include motor encoder, brake and other related components built in the sealing cavity.

[0036] In the technical solution, by setting the refrigerant refrigeration component in the air compressor unit, and then by introducing the low-temperature and low-pressure gaseous refrigerant into the motor sealed shell 21 of the motor driving part of the air compression, the high-efficiency cooling of the related components in the motor driving part can be realized, and only the refrigerant inlet 211 and the refrigerant outlet 212 need to be set on the motor sealed shell 21 under the premise of ensuring the sealing of the motor sealed shell 21, without the need to set a cooling channel in the motor shell, which can significantly reduce the design difficulty and does not need to open the mold to manufacture the motor shell, thereby reducing the manufacturing cost. At the same time, since the gaseous refrigerant is used to cool the internal components of the motor sealed shell 21, the refrigerant has higher refrigeration performance compared with air flow (wind) and cooling liquid (such as water), which can significantly improve the cooling effect of the motor driving part, especially suitable for high-speed operation of magnetic levitation air compressor.

[0037] The aforementioned motor sealing shell 21 is specifically designed as a fully sealed shell structure, wherein the non-axial extension end of the rotating shaft of the motor rotor is pivotally connected to the inner side wall surface of the rear end cover, and the axial extension end of the rotating shaft of the motor rotor extends into the volute of the air compression part, and a labyrinth seal or the like is arranged at the connecting position of the volute and the motor sealing shell 21 to achieve a leak-proof design at the position.

[0038] In some embodiments, a refrigerant storage tank 34 is arranged between the refrigerant outlet 212 and the suction port of the refrigerant compressor 31.

[0039] In the technical solution, the refrigerant storage tank 34 arranged between the refrigerant outlet 212 and the suction port of the refrigerant compressor 31 can store the liquid phase part of the refrigerant flowing out after heat exchange with the components inside the motor sealing shell 21, and the gas phase part is sucked into the refrigerant compressor 31, that is, the liquid carrying phenomenon caused by the suction of the refrigerant compressor 31 is prevented.

[0040] In some embodiments, the refrigerant refrigeration assembly further comprises an evaporator 35, which is connected between the outlet of the throttling element 33 and the refrigerant inlet 211, and the evaporator 35 can cool the frequency converter 20 of the air compressor 2 and / or the unit main control component 10 of the air compressor unit.

[0041] In the technical solution, the evaporator 35 is arranged between the throttling element 33 and the refrigerant inlet 211, and the cooling capacity of the evaporator 35 is used to form efficient heat dissipation for the frequency converter 20 and the unit main control component 10, effectively preventing the temperature of the heating components in the frequency converter 20 and the unit main control component 10 from being too high.

[0042] In a specific embodiment, the evaporator 35 has a back plate (not shown in the figure, not referenced) with a cooling flow channel formed inside, and the frequency converter 20 and the unit main control component 10 are assembled on the back plate.

[0043] In the technical solution, the cooling flow channel is arranged in the back plate, and the frequency converter 20 and the unit main control component 10 are assembled on the back plate, which can further realize targeted cooling of the frequency converter 20 and the unit main control component 10. The aforementioned cooling flow channel is specifically communicated with the heat exchange pipe in the evaporator 35, for example.

[0044] In some embodiments, the evaporator 35 is provided with a first fan 351, which can drive air to flow into the accommodation space through the evaporator 35. The aforementioned first fan 351 can be an axial flow fan.

[0045] In the technical solution, the first fan 351 is arranged for the evaporator 35, and then the airflow cooled by the evaporator 35 is driven into the accommodation space by the rotating first fan 351, thereby efficiently cooling the components in the accommodation space, such as the overall air compressor 2, the refrigerant compressor 31 and the like.

[0046] Specifically referring to Figure 4 As shown in some embodiments, the condenser 32 is arranged with a second fan 321, which can drive the airflow in the accommodation space to be discharged outside the unit shell 1.

[0047] In the technical solution, the second fan 321 can drive the airflow in the accommodation space to flow through the condenser 32, thereby achieving heat dissipation and cooling of the condenser 32. It should be noted that, due to the arrangement of the aforementioned evaporator 35, the temperature of the airflow in the accommodation space is relatively low, and therefore this part of the airflow can achieve more efficient cooling of the condenser 32.

[0048] In some embodiments, the unit shell 1 is formed with an electrical cabinet arranged separately from the accommodation space, and the frequency converter 20 and the unit main control component 10 are assembled in the electrical cabinet (not labeled in the figure, such as Figure 5 As shown in some embodiments, the unit shell 1 is formed with an electrical cabinet arranged separately from the accommodation space, and the frequency converter 20 and the unit main control component 10 are assembled in the electrical cabinet (not labeled in the figure, such as

[0049] In the technical solution, the electrical cabinet is arranged separately from the accommodation space on the unit shell 1, and the frequency converter 20 and the unit main control component 10 are arranged in the electrical cabinet, which is beneficial to the protection of the electrical elements in the frequency converter 20 and the unit main control component 10.

[0050] In a preferred embodiment, referring to Figure 5 As shown in some embodiments, the electrical cabinet is divided into two relatively independent electrical chambers, one on the left and one on the right. The unit main control component 10 (weak current) is arranged in the left electrical chamber, and the frequency converter 20 (strong current) is arranged in the right electrical chamber, thereby achieving independent arrangement of strong and weak currents. Since the frequency converter 20 has a large amount of heat dissipation, a ventilation opening 11 is provided between the electrical chamber of the electrical cabinet accommodating the frequency converter 20 and the accommodation space, and a corresponding air inlet (a filter is required) is also provided on the sealing door.

[0051] In some embodiments, the refrigerant refrigeration assembly further comprises a gas-liquid separator 36, which is connected between the refrigerant outlet of the evaporator 35 and the refrigerant inlet 211.

[0052] The technical scheme has the following beneficial effects: the gas-liquid separator 36 is arranged before the refrigerant inlet 211, so that the gas-liquid separation is performed before the refrigerant enters the motor sealed shell 21, the refrigerant entering the motor sealed shell 21 is in gas phase, and the high-efficiency cooling of the components in the motor sealed shell 21 is ensured.

[0053] In some embodiments, the condenser 32 is arranged at the top region of the accommodating space (e.g., the upper part of the accommodating space in the orientation shown), and the air outlet direction of the condenser 32 is from bottom to top. Figure 1

[0054] The technical scheme has the following beneficial effects: the condenser 32 is arranged at the top region of the accommodating space and the air outlet direction of the condenser 32 is from bottom to top, so that the exhaust air flow can be away from the area where the air compressor unit is located by using the characteristic that the hot air flow has a small density, and the hot air flow is prevented from being sucked into the accommodating space again.

[0055] Specifically referring to Figure 6 The technical scheme of the utility model adopts the global refrigerant circulation cooling design, uses the gas-liquid phase change of refrigerant, and uses the refrigerant in different states for the heat dissipation of the air compressor 2, the frequency converter 20 and the unit main control component 10 respectively, and meanwhile, the effect of optimizing the heat dissipation of the whole machine (i.e., the aforementioned accommodating space) can be achieved; in the circulating phase change refrigerant, the low-temperature and low-pressure liquid refrigerant is used for the heat dissipation of the electrical cabinet, the air-cooled cooling is used for the low-temperature air-cooled heat dissipation of the compressor chamber (i.e., the aforementioned accommodating space), the low-temperature and low-pressure gas refrigerant is used for the heat dissipation of the air compressor 2, the condenser 32 is used at the top of the unit for the heat dissipation of the high-temperature and high-pressure refrigerant, and the refrigerant circulation cooling purpose of the whole machine is achieved.

[0056] It is easy for those skilled in the art to understand that the advantageous technical features of the above-mentioned modes can be freely combined and superimposed without conflict.

[0057] The above description is merely preferred embodiments of the utility model, and is not intended to limit the utility model, and any modification, equivalent replacement and improvement made within the spirit and principle of the utility model shall be included in the protection scope of the utility model. The above description is merely preferred embodiments of the utility model, and it should be pointed out that, for ordinary skilled in the art, without departing from the technical principle of the utility model, a plurality of improvements and modifications can be made, and these improvements and modifications shall be regarded as the protection scope of the utility model.​

Claims

1. An air compressor unit, characterized in that: The invention comprises a unit housing (1), an air compressor (2) and a refrigerant refrigeration component. The unit housing (1) has a storage space, the air compressor (2) and the refrigerant refrigeration component are both located in the storage space, the air compressor (2) comprises an air compression part and a drive motor part for driving the air compression part to compress air, the drive motor part has a motor sealing shell (21), the motor sealing shell (21) has a sealed cavity for assembling a motor stator and a motor rotor, the refrigerant refrigeration component comprises a refrigerant compressor (31), a condenser (32 ) and a throttling element (33), the condenser (32) is connected between the exhaust port of the refrigerant compressor (31) and the inlet of the throttling element (33), and the motor sealed housing (21) is constructed with a refrigerant inlet (211) and a refrigerant outlet (212), the refrigerant flowing out of the throttling element (33) can be introduced into the sealed cavity through the refrigerant inlet (211), and the refrigerant entering the sealed cavity can be sucked into the refrigerant compressor (31) through the refrigerant outlet (212) after heat exchange with the components in the sealed cavity.

2. The air compressor unit according to claim 1, characterized in that: A refrigerant storage tank (34) is provided between the refrigerant outlet (212) and the air intake of the refrigerant compressor (31); or, the air compressor (2) is a magnetic levitation air compressor.

3. The air compressor unit according to claim 1, characterized in that: The refrigerant refrigeration component also includes an evaporator (35), which is connected between the outlet of the throttling element (33) and the refrigerant inlet (211). The evaporator (35) can cool the inverter (20) of the air compressor (2) and / or the main control component (10) of the air compressor unit.

4. The air compressor unit according to claim 3, characterized in that: The evaporator (35) has a back plate with a cooling channel formed therein, and the frequency converter (20) and the unit main control component (10) are assembled on the back plate.

5. The air compressor unit according to claim 3, characterized in that: The evaporator (35) is equipped with a first fan (351), and the first fan (351) is capable of driving air to flow into the accommodating space through the evaporator (35).

6. The air compressor unit according to claim 5, characterized in that: The condenser (32) is equipped with a second fan (321), and the second fan (321) is capable of driving the airflow in the accommodating space to be discharged outside the unit casing (1).

7. The air compressor unit according to claim 4, characterized in that: An electrical cabinet is formed on the unit housing (1) and is separated from the accommodating space. The frequency converter (20) and the unit main control component (10) are both assembled in the electrical cabinet.

8. The air compressor unit according to claim 7, characterized in that: A ventilation opening (11) is provided between the electrical cabinet and the accommodating space.

9. The air compressor unit according to claim 3, characterized in that: The refrigerant refrigeration component further includes a gas-liquid separator (36), and the gas-liquid separator (36) is connected between the refrigerant outflow port of the evaporator (35) and the refrigerant inlet (211).

10. The air compressor unit according to claim 1, characterized in that: The condenser (32) is arranged in the top area of ​​the accommodating space, and the air outlet direction of the condenser (32) is from bottom to top.

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