Air compressor unit

Abstract

The invention provides an air compressor unit which comprises a unit shell, an air compressor and a refrigerant refrigeration assembly, a containing space is formed 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, the driving motor part is provided with a motor sealing shell, and the motor sealing shell is provided with a sealing cavity; the refrigerant refrigeration 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, a refrigerant flowing out of the throttling element is introduced into the sealing cavity through the refrigerant inlet, and the refrigerant outlet is communicated with the refrigerant compressor. 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. A cooling flow channel does not need to be arranged in the motor shell, the design difficulty can be remarkably reduced, the motor shell does not need to be manufactured through mold opening, and therefore the manufacturing cost is reduced, and higher refrigeration performance is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of air compression equipment, and in particular relates to an air compressor unit. Background Art

[0002] The speed of the magnetic levitation centrifugal air compressor is high, generally reaching more than 30,000 RPM, and the heat generated by the stator and rotor is extremely high, which places high demands on the heat dissipation design of the air compressor. At present, the mainstream heat dissipation method basically adopts the form of water cooling and air cooling. Among them, water cooling mainly dissipates heat for the stator core, and air cooling dissipates heat for the stator coil (that is, the stator winding) and rotor inside the compressor. Some existing technologies also adopt a pure air cooling solution, using a large-flow fan to cool the stator and rotor inside the motor.

[0003] For example, the patent with publication number CN113833682A discloses a magnetic levitation air compressor, which discloses the heat dissipation mode of the magnetic levitation motor in the whole machine system. A motor air inlet connected to the air outlet of the centrifugal fan is arranged on one side of the magnetic levitation motor, and a motor air outlet connected to the heat dissipation bellows is arranged on the upper end of the magnetic levitation motor. The heat dissipation bellows is provided with an air outlet connected to the outside of the chassis. The invention has the effect of effectively reducing the internal heat of the magnetic levitation motor; however, the solution only uses air cooling for heat dissipation, which has extremely high requirements for the heat dissipation inside the motor, and it is difficult to effectively dissipate the heat inside the stator winding;

[0004] The patent with publication number CN116317302A discloses a cooling structure of a magnetic levitation centrifugal compressor motor. In the patent, the magnetic levitation centrifugal compressor adopts air cooling and water cooling. Heat dissipation areas connected to the heat dissipation gap are provided at both ends of the stator, and air inlets and air outlets connected to the heat dissipation areas are fixedly provided on the outer shell. A water cooling channel is provided inside the outer shell, and a water inlet and a water outlet connected to the water cooling channel are fixedly provided on the outer shell. The advantage of this invention is that the air cooling and water cooling methods are combined to dissipate heat together, which can improve the cooling efficiency of the magnetic levitation motor to a certain extent. Based on the above advantages, this solution is the current mainstream heat dissipation solution for magnetic levitation air compressors, but this solution is complex in design, and a cooling channel needs to be provided on the motor housing, which is difficult to design and has high mold opening costs. Summary of the invention

[0005] Therefore, the present invention provides an air compressor unit that can overcome the technical problems in the related art that the air compressor unit, especially the high-speed magnetic levitation air compressor unit, has poor heat dissipation effect or the heat dissipation structure requires a cooling channel to be set in the motor housing, which results in great design difficulty and high mold opening cost.

[0006] In order to solve the above problems, the present invention provides an air compressor unit, including a unit casing, an air compressor and a refrigerant refrigeration component. The unit casing has an accommodating space, and the air compressor and the refrigerant refrigeration component are both located in the accommodating space. The air compressor includes an air compression part and a driving motor part for driving the air compression part to compress air. The driving motor part has a motor sealed housing, and the motor sealed housing has a sealed cavity for assembling a motor stator and a motor rotor. The refrigerant refrigeration component includes a refrigerant compressor, a condenser and a throttling element. The condenser is connected between the exhaust port of the refrigerant compressor and the inlet of the throttling element. A refrigerant inlet and a refrigerant outlet are constructed on the motor sealed housing. The refrigerant flowing out of the throttling element can be introduced into the sealed cavity through the refrigerant inlet, and the refrigerant entering the sealed cavity can be sucked into the refrigerant compressor through the refrigerant outlet after heat exchange with the components in the sealed cavity.

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

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

[0009] In some embodiments, the evaporator has a back plate with a cooling channel formed therein, and the inverter and the main control components of the unit are assembled on the back plate.

[0010] In some embodiments, the evaporator is equipped with a first fan, and the first fan can drive air to flow into the accommodating space through the evaporator.

[0011] In some embodiments, the condenser is equipped with a second fan, and the second fan can drive the airflow in the accommodating space to be discharged outside the unit casing.

[0012] In some embodiments, an electrical cabinet is formed on the unit casing and is separated from the accommodating space, and the inverter and the unit main control components are assembled in the electrical cabinet.

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

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

[0015] In some embodiments, the condenser is disposed in a top area of ​​the accommodating space, and the air outlet direction of the condenser is from bottom to top.

[0016] The air compressor unit provided by the present invention has the following beneficial effects:

[0017] By arranging a refrigerant refrigeration component in the air compressor unit, and then introducing a low-temperature and low-pressure gaseous refrigerant into the motor sealed housing of the motor drive part of the air compressor, it is possible to achieve efficient cooling of various related components in the motor drive part. It is only necessary to arrange a refrigerant inlet and a refrigerant outlet on the motor sealed housing on the premise of ensuring the sealing of the motor sealed housing. There is no need to arrange a cooling flow channel in the motor housing, which can significantly reduce the design difficulty and does not require mold manufacturing of the motor housing, thereby reducing the manufacturing cost; at the same time, since a gaseous refrigerant is used to cool the internal components of the motor sealed housing, the refrigerant has a higher refrigeration performance than airflow (wind) and coolant (such as water), which can significantly improve the cooling effect on the motor drive part, and is particularly suitable for high-speed working conditions of magnetic levitation air compressors;

[0018] By arranging a refrigerant storage tank between the refrigerant outlet and the air intake of the refrigerant compressor, the liquid phase of the refrigerant flowing out after heat exchange with the components inside the motor sealed housing can be stored, while the gas phase is sucked into the refrigerant compressor, that is, the liquid hammer phenomenon caused by the suction of the refrigerant compressor with liquid can be prevented;

[0019] By setting an evaporator between the throttling element and the refrigerant inlet, the cooling capacity of the evaporator is used to efficiently dissipate heat for the inverter and the main control components of the unit, effectively preventing the temperature of the heating components in the inverter and the main control components of the unit from being too high;

[0020] A first fan is configured for the evaporator, and the airflow after heat exchange with the evaporator is driven into the accommodating space by the rotating first fan, so that various components in the accommodating space, such as the entire air compressor and the refrigerant compressor, can be efficiently cooled;

[0021] The technical solution of the present invention adopts a global refrigerant circulation heat dissipation design, and utilizes the gas-liquid phase change of the refrigerant. The refrigerant in different states is used for the heat dissipation of the air compressor, the inverter and the main control components of the unit, and at the same time, the effect of optimizing the internal heat dissipation of the whole machine can be achieved; in the circulating phase change refrigerant, the low-temperature and low-pressure liquid refrigerant is used to dissipate the heat of the electrical cabinet, and at the same time, air cooling is used to perform low-temperature air cooling on the compressor room, and the low-temperature and low-pressure gaseous refrigerant is used to dissipate the heat of the air compressor. A condenser is used on the top of the unit to dissipate the high-temperature and high-pressure refrigerant, thereby achieving the purpose of refrigerant circulation heat dissipation of the whole unit. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the implementation methods of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the implementation methods or the description of the prior art. The drawings described below are only exemplary, and for ordinary technicians in this field, other implementation drawings can be derived from the provided drawings without creative work.

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

[0024] Figure 2 yes Figure 1 A schematic diagram of the three-dimensional structure of the air compressor unit in another perspective;

[0025] Figure 3 yes Figure 2 A partial enlarged view of the middle A;

[0026] Figure 4 yes Figure 1 A schematic diagram of the three-dimensional structure of the air compressor unit in another perspective;

[0027] Figure 5 yes Figure 1 The left side view of the air compressor unit in FIG. 1 (showing the front view of the electrical cabinet, with the electrical cabinet sealing door omitted in the figure);

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

[0029] The accompanying drawings are marked as follows:

[0030] 1. Unit casing; 10. Unit main control components; 11. Ventilation port; 2. Air compressor; 20. Frequency converter; 21. Motor sealed housing; 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 following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

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

[0034] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0035] See also Figures 1 to 6As shown, according to an embodiment of the present invention, an air compressor unit is provided, including a unit casing 1, an air compressor 2 and a refrigerant refrigeration component (not labeled in the figure), the unit casing 1 has a accommodating space (not labeled in the figure), the air compressor 2 and the refrigerant refrigeration component are both in the accommodating space, the air compressor 2 includes an air compression part (not labeled in the figure) and a driving motor part (not labeled in the figure) for driving the air compression part to compress air, the driving motor part has a motor sealing housing 21, the motor sealing housing 21 has a sealed cavity for assembling a motor stator (not labeled in the figure) and a motor rotor (not labeled in the figure), it can be understood that the stator coil of the motor stator will generate a magnetic field after current is passed through, thereby driving the motor rotor to rotate, and the motor rotor drives the impeller assembled at its end in the air compression part to compress air, when the aforementioned air compressor 2 is a magnetic suspension air compressor, the rotating shaft of the motor rotor is supported by a magnetic suspension bearing (not labeled in the figure) Not shown, it generally includes a magnetic suspension radial bearing and an axial bearing, and of course it can also be a magnetic suspension composite bearing) supported in the motor sealed housing 21, the refrigerant refrigeration component includes a refrigerant compressor 31, a condenser 32 and a throttling element 33 (specifically, for example, an electronic expansion valve), the condenser 32 is connected between the exhaust port of the refrigerant compressor 31 and the inlet of the throttling element 33, 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, the components in the aforementioned sealed cavity specifically include the aforementioned motor rotor, motor stator, magnetic suspension bearing and other components, and in some cases, also include motor encoders, brakes and other related components built into the sealed cavity.

[0036] In this technical solution, by arranging a refrigerant refrigeration component in the air compressor unit, and then by introducing a low-temperature and low-pressure gaseous refrigerant into the motor sealed housing 21 of the motor drive part of the air compressor, efficient cooling of the relevant components in the motor drive part can be achieved. It is only necessary to arrange a refrigerant inlet 211 and a refrigerant outlet 212 on the motor sealed housing 21 under the premise of ensuring the sealing of the motor sealed housing 21. There is no need to arrange a cooling flow channel in the motor housing, which can significantly reduce the design difficulty and eliminate the need to open a mold to manufacture the motor housing, thereby reducing the manufacturing cost. At the same time, since a gaseous refrigerant is used to cool the internal components of the motor sealed housing 21, the refrigerant has a higher refrigeration performance than airflow (wind) and coolant (such as water), which can significantly improve the cooling effect on the motor drive part, and is particularly suitable for high-speed working conditions of magnetic levitation air compressors.

[0037] The aforementioned motor sealed housing 21 is specifically designed as a fully sealed housing structure, wherein the non-extended end of the motor rotor's shaft is pivotally connected to the inner wall surface of the rear end cover, and the extended end of the motor rotor's shaft extends into the volute of the air compression part, and a leak-proof design is implemented at the connection position between the volute and the motor sealed housing 21 by setting a labyrinth seal or the like.

[0038] In some embodiments, a refrigerant storage tank 34 is disposed between the refrigerant outlet 212 and the air intake of the refrigerant compressor 31 .

[0039] In this technical solution, a refrigerant storage tank 34 is provided between the refrigerant outlet 212 and the air intake port of the refrigerant compressor 31, so that the liquid phase of the refrigerant flowing out after heat exchange with the components inside the motor sealed housing 21 can be stored, while the gas phase is sucked into the refrigerant compressor 31, thereby preventing the liquid hammer phenomenon caused by the liquid in the air intake of the refrigerant compressor 31.

[0040] In some embodiments, 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.

[0041] In this technical solution, an 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 efficiently dissipate heat for the inverter 20 and the main control component 10 of the unit, thereby effectively preventing the temperature of the heat-generating components in the inverter 20 and the 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 labeled) with a cooling channel formed inside, and the inverter 20 and the unit main control component 10 are assembled on the back plate.

[0043] In this technical solution, by providing a cooling channel in the back plate and assembling the inverter 20 and the unit main control component 10 on the back plate, targeted cooling of the inverter 20 and the unit main control component 10 can be further achieved. The cooling channel can be specifically connected to the heat exchange pipe in the evaporator 35, for example.

[0044] In some embodiments, the evaporator 35 is equipped with a first fan 351, and the first fan 351 can drive the air to flow into the accommodating space through the evaporator 35. The first fan 351 can specifically be an axial flow fan.

[0045] In this technical solution, a first fan 351 is configured for the evaporator 35, and the airflow after heat exchange and cooling with the evaporator 35 is driven into the accommodating space by the rotating first fan 351, thereby being able to efficiently cool various components in the accommodating space, such as the aforementioned air compressor 2 as a whole, the refrigerant compressor 31 and other components.

[0046] See Figure 4 As shown, in some embodiments, the condenser 32 is configured with a second fan 321, and the second fan 321 can drive the airflow in the accommodating space to be discharged outside the unit casing 1.

[0047] In this technical solution, the second fan 321 is provided to 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 provision of the aforementioned evaporator 35, it ensures that the temperature of the airflow in the accommodation space is relatively low, so this part of the airflow can achieve more efficient cooling of the condenser 32.

[0048] In some embodiments, the unit housing 1 is formed with an electrical cabinet separated from the accommodating space, and the inverter 20 and the unit main control component 10 are assembled in the electrical cabinet (not marked in the figure, such as Figure 5 shown).

[0049] In this technical solution, an electrical cabinet separated from the accommodating space is formed on the unit casing 1, and the inverter 20 and the unit main control component 10 are arranged in the electrical cabinet, which is beneficial to ensure the protection of the electrical components in the inverter 20 and the unit main control component 10.

[0050] In a preferred embodiment, see Figure 5 As shown, the aforementioned electrical cabinet is divided into two relatively independent electrical chambers, one on the left and one on the right, wherein the unit main control component 10 (weak current) is located in the electrical chamber on the left, and the inverter 20 (strong current) is located in the electrical chamber on the right, so as to realize the independent arrangement of strong and weak currents. Since the heat dissipation of the inverter 20 is relatively large, a vent 11 is provided between the electrical chamber of the electrical cabinet accommodating the inverter 20 and the accommodating space, and a corresponding air inlet is also provided on the corresponding sealed door (a filter element needs to be provided).

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

[0052] In this technical solution, a gas-liquid separator 36 is arranged before the refrigerant inlet 211 to perform gas-liquid separation before the refrigerant enters the motor sealed housing 21, which can ensure that the refrigerant entering the motor sealed housing 21 is a gas-phase refrigerant, thereby ensuring efficient cooling of various components in the motor sealed housing 21.

[0053] In some embodiments, the condenser 32 is disposed in the top area of ​​the accommodating space (eg Figure 1 The upper part of the orientation shown), and the air outlet direction of the condenser 32 is from bottom to top.

[0054] In this technical solution, the condenser 32 is arranged in the top area of ​​the accommodating space and its air outlet direction is from bottom to top. The characteristic of the low density of the hot air flow can be utilized to make the exhausted air flow stay away from the area where the air compressor unit is located, preventing the hot air flow from being sucked into the accommodating space again.

[0055] See Figure 6 As shown, the technical solution of the present invention adopts a global refrigerant circulation heat dissipation design, and utilizes the gas-liquid phase change of the refrigerant to respectively use the refrigerant in different states for the heat dissipation of the air compressor 2, the inverter 20 and the main control component 10 of the unit, thereby achieving the effect of optimizing the heat dissipation inside the entire machine (that is, the aforementioned accommodating space); in the circulating phase-changing refrigerant, the low-temperature and low-pressure liquid refrigerant is utilized to dissipate the heat of the electrical cabinet, while air cooling is used to perform low-temperature air cooling on the compressor room (that is, the aforementioned accommodating space), and the low-temperature and low-pressure gaseous refrigerant is utilized to dissipate the heat of the air compressor 2, and the condenser 32 is used on the top of the unit to dissipate the high-temperature and high-pressure refrigerant, thereby achieving the purpose of refrigerant circulation heat dissipation of the entire unit.

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

[0057] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principle of the present invention shall be included in the protection scope of the present invention. The above description is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present invention. These improvements and variations should also be regarded as the protection scope of the present invention.

Claims

1. An air compressor unit, characterized in that: The invention comprises a machine unit housing (1), an air compressor (2) and a refrigerant refrigeration component. The machine 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 comprises a motor sealed housing (21), the motor sealed housing (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), 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 magnetically suspended 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), and 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 inside, 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 provided 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 casing (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 also 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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