CN116888368A - Air compressor - Google Patents

Abstract

An air compressor according to an aspect of the present invention includes: a housing; a rotation shaft provided in the housing; a compression unit connected to the rotation shaft to compress and discharge inlet air; a motor unit driving the rotation shaft; a control board that controls the motor unit; and a filter unit that filters noise from external power and supplies the external power to the control board, wherein the housing includes a first cooling flow passage for cooling the motor unit and a second cooling flow passage for cooling the filter unit, and the first cooling flow passage communicates with the second cooling flow passage.

Description

Air compressor

Technical Field

The present invention relates to an air compressor, and more particularly, to an air compressor integrally provided with a control unit.

Background

In general, a fuel cell vehicle is a vehicle in which hydrogen and oxygen are supplied to a humidifier, and electric energy generated by an electrochemical reaction, which is an electrolytic reaction of water, is supplied as a driving force of the vehicle. A typical fuel cell vehicle is proposed in korean patent registration No. 0962903.

Typically, fuel cell cars are provided with 80kW fuel cell stacks. In the case where the fuel cell stack is operated under pressurized conditions, high-pressure air ranging from 1.2 bar to 3.0 bar is supplied to the fuel cell stack. For this purpose, it is necessary to use an air compressor that operates at a speed of 5,000rpm to 100,000 rpm.

A fuel cell vehicle generally includes a fuel cell stack configured to generate electric power, a humidifier configured to humidify fuel and air to be supplied to the fuel cell stack, a fuel supply unit configured to supply hydrogen to the humidifier, an air supply unit configured to supply air including oxygen to the humidifier, a cooling module configured to cool the fuel cell stack, and the like.

The air supply unit includes an air cleaner configured to filter out foreign matter contained in air, an air compressor configured to compress and supply the air filtered by the air cleaner, and a control box configured to control the air compressor.

The above-described air compressor compresses air sucked from the outside using an impeller, and then discharges the compressed air to the fuel cell stack through a discharge port. In this case, the impeller and the shaft constituting the compression unit are driven by the rotational force of the motor.

The inverter supplies power to a motor of such an air compressor and controls the operation of the motor. The inverter includes a Printed Circuit Board (PCB) on which transistors, capacitors, inductors, and electrical components such as constant resistors, diodes, and drivers are mounted.

However, the inside of the conventional air compressor is overheated due to heat generated by the motor and the inverter. Further, there are problems in that a separate space for disposing the cooling device is required and the size of the air compressor is increased.

Disclosure of Invention

Technical proposal

An air compressor according to an aspect of the present invention may include: a housing; a rotation shaft provided inside the housing; a compression unit connected to the rotation shaft and compressing and discharging introduced air; a motor unit driving the rotation shaft; a control board that controls the motor unit; and a filter unit that filters noise of external power and supplies the external power to the control board, wherein the housing includes a first cooling flow passage for cooling the motor unit and a second cooling flow passage for cooling the filter unit, and the first cooling flow passage communicates with the second cooling flow passage.

Preferably, the first cooling flow passage may be provided in an axial direction of the motor unit.

Preferably, the first cooling flow passage may be provided as a plurality of first cooling flow passages.

Preferably, the plurality of first cooling flow passages may be connected by a connection passage, and the connection passage may be disposed such that the heat exchange medium moving in the first cooling flow passages moves in a zigzag pattern.

Preferably, the second cooling flow passage may be provided along a radial direction of the motor unit.

Preferably, the second cooling flow passage may be in heat exchange relationship with the configuration of the filter unit.

Preferably, the second cooling flow passage may be provided inside the heat exchanger.

Preferably, heat exchange may be performed on at least one surface of the heat exchanger.

Preferably, the second cooling flow passage may be provided behind the motor unit.

Preferably, the first cooling flow passage and the second cooling flow passage may be connected in series.

Preferably, regions of the second cooling flow passage and the first cooling flow passage may be provided on upper and lower portions of the filter unit, respectively.

Preferably, the filter unit may include a transistor, and the heat exchanger may be in heat exchange with the transistor.

Preferably, the second cooling flow path may include a 2-1 cooling flow path and a 2-2 cooling flow path.

Preferably, the 2-1 th cooling flow passage may be provided on an upper portion of the filter unit, and the 2-2 nd cooling flow passage may be provided on a lower portion of the filter unit.

Preferably, one side of the heat exchanger may exchange heat with the filter unit, and the other side of the heat exchanger may exchange heat with the motor unit.

Preferably, the heat exchanger may include a first heat exchange passage and a second heat exchange passage, the 2-1 cooling flow passage being provided in the first heat exchange passage, and the 2-2 cooling flow passage being provided in the second heat exchange passage.

Preferably, the housing may include an impeller housing and a driving housing, the motor unit may be disposed in the driving housing, receiving units may be formed at both sides of an upper portion of the motor unit, and the filter unit may be disposed in the receiving units.

Preferably, at least one of the receiving units may be connected to the connector unit.

Preferably, the motor unit may include a rotor disposed outside the rotation shaft and a stator disposed on the outside of the rotation shaft, the stator may include teeth and a shoe disposed at an end of the teeth, and a groove may be disposed to be offset from a center line of the teeth at an end of the shoe facing the rotor.

Preferably, the air compressor may include a cooling cover provided on the heat exchanger, wherein the cooling cover and the heat exchanger may be integrally provided.

Advantageous effects

According to an embodiment, an arrangement relation between the cooling flow passage and the filter unit may be improved to increase internal heat exchange efficiency and reduce the size of the air compressor.

Various useful advantages and effects of the present invention are not limited to the foregoing, and may be more readily understood when describing the specific embodiments of the present invention.

Drawings

Fig. 1 is a schematic cross-sectional view of an air compressor according to an embodiment of the present invention.

Fig. 2 is a plan view of a housing and filter unit according to an embodiment of the invention.

Fig. 3 is a partial sectional view of an air compressor according to an embodiment of the present invention.

Fig. 4 is a partial sectional view of an air compressor according to an embodiment of the present invention.

Fig. 5 is a plan view of a housing according to an embodiment of the present invention.

Fig. 6 is a partial sectional view of a front portion of an air compressor according to an embodiment of the present invention.

Fig. 7 is a partial sectional view of a front portion of an air compressor according to an embodiment of the present invention.

Fig. 8 is a diagram showing positions of a first cooling flow passage and a second cooling flow passage in a housing according to an embodiment of the present invention.

Fig. 9 is a diagram showing the shape of the first cooling flow passage in fig. 8.

Fig. 10 is a view showing inflow and outflow structures of the heat exchange medium in fig. 1.

Fig. 11 is a diagram illustrating an internal structure of fig. 1.

Fig. 12 is a view showing a first embodiment of the cooling flow passage in fig. 1.

Fig. 13 is a diagram illustrating a flow of the heat exchange medium in fig. 12.

Fig. 14 is a diagram showing a second embodiment of the cooling flow passage in fig. 1.

Fig. 15 is a diagram illustrating a flow of the heat exchange medium in fig. 14.

Fig. 16 is a perspective view of a cover according to an embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings.

However, the technical spirit of the present invention is not limited to some embodiments to be described, and may be implemented using various other embodiments, and one or more components of the embodiments may be selectively coupled, replaced, and used within the technical spirit of the present invention.

Furthermore, unless the context clearly and specifically defined, terms used herein (including technical and scientific terms) may be interpreted to have meanings commonly understood by those skilled in the art, and the meanings of commonly used terms such as terms defined in dictionaries will be interpreted in view of the context of the relevant art.

Furthermore, the terminology used in the embodiments of the invention is for the purpose of description and not of limitation.

In this specification, unless the context clearly indicates otherwise, the singular form includes the plural form, and where "at least one (or one or more) of A, B and C" is described, this may include at least one of all possible combinations of A, B and C.

Further, in the description of the components of the present invention, terms such as "first", "second", "a", "B", "a", and "(B)" may be used.

These terms are only used to distinguish one element from another element, and the nature, order, etc. of the elements are not limited to these terms.

In addition, when an element is referred to as being "connected," "coupled," or "linked" to another element, it can be directly connected or coupled to the other element or be connected, coupled, or linked to the other element with the other element disposed therebetween.

In addition, when any one element is described as being formed or disposed "on (upper)" or "under (lower)" another element, such description includes both the case where two elements are formed or disposed in direct contact with each other and the case where one or more other elements are interposed between the two elements. In addition, when an element is described as being formed on "upper (upper) or lower (lower)" of another element, such description may include a case where the element is formed on an upper side or a lower side with respect to the other element.

Hereinafter, embodiments will be described in detail with reference to the drawings, and in all the drawings, components identical or corresponding to each other will be denoted by the same reference numerals, and redundant description will be omitted.

In fig. 1 to 16, only major parts are clearly shown for a conceptual clear understanding of the present invention, and thus, various changes to the drawings may be considered, and the scope of the present invention is not necessarily limited to the specific shapes shown in the drawings.

Fig. 1 is a schematic cross-sectional view of an air compressor according to an embodiment of the present invention.

Referring to fig. 1, the air compressor may include a housing 100, a compression unit 200, a motor unit 300, a control board 410, a filter unit 500, and a bus bar assembly 600.

The housing 100 constitutes the outside, and the rotation shaft 101, the compression unit 200, and the motor unit 300 are disposed in the housing 100. The housing 100 may include an impeller housing 110 and a drive housing 120.

The inlet aperture and the outlet may be provided in the impeller housing 110. Further, the compression unit 200 is disposed in the inner space of the impeller housing 110. In this case, the air introduced through the inlet hole is compressed by the compression unit 200 and discharged to the outside through the discharge port.

The drive housing 120 is connected to the rear end of the impeller housing 110. Here, the rear side is disposed in a direction from the compression unit 200 toward the motor unit 300, and the front side is disposed in a direction opposite to the direction toward the rear side. In this case, the motor unit 300 is disposed in the inner space of the driving housing 120. In addition, a cooling flow passage may be formed inside the driving housing 120.

The compression unit 200 is disposed at a front side in the housing 100.

The motor unit 300 is used to rotationally drive the rotation shaft 101 to supply driving force to the compression unit 200. In this case, the motor unit 300 may include a rotor 310 and a stator 320. The stator 320 may include a driving coil. When power is supplied from the outside, the driving coil generates electromagnetic force. Accordingly, the rotor 310 may rotate due to electromagnetic interaction between the rotor 310 and the stator 320. Meanwhile, one side of the rotor 310 is connected to the compression unit 200 to drive the compression unit 200. In this case, the driving coil may be operated by receiving three-phase alternating current.

Referring to fig. 1 and 6, a stator 320 of the motor unit 300 is disposed on an outer surface of the rotor 310. The driving coil 330 is provided to be wound on the outer surface of the teeth 321 provided on the stator 320. An insulator 340 may be provided between the teeth 321 and the driving coil 330.

In this case, the end of the tooth 321 is disposed in the circumferential direction to face the rotor 310. A shoe 322 is provided at an end of the tooth 321 facing the rotor 310.

In this case, the groove 322a may be formed at an end of the shoe 322. The grooves 322a may prevent magnetic flux from concentrating into the teeth 321 of the stator 320 when the rotor 310 rotates.

In one embodiment, the groove 322a may be arranged offset from the center line of the tooth 321.

The circuits and elements for controlling the motor unit 300 are mounted on the control board 410. In this case, the control board 410 may be a Printed Circuit Board (PCB). The control board 410 may be disposed at the rear side of the rotation shaft 101 and the motor unit 300, and may be spaced apart from the rear end of the rotation shaft 101. The control board 410 is formed in the shape of a plate. The thickness direction of the control plate 410 may be disposed to face the axial direction of the rotation shaft 101.

The filter unit 500 receives external power and supplies the external power to the control board 410. The filter unit 500 supplies external power to the control board 410 in a state where noise of the power is removed. In this case, the filter unit 500 may be disposed outside the motor unit 300 in the radial direction.

The bus bar assembly 600 transmits the power of the control board 410 to the motor unit 300. In this case, the power may be transmitted to the motor unit 300 through the filter unit 500 and the bus bar assembly 600. The bus bar assembly 600 may transmit the three-phase AC voltage converted by the filter unit 500 to the motor unit 300.

Fig. 2 is a plan view of a housing and a filter unit according to an embodiment of the present invention, and fig. 3 is a partial sectional view of an air compressor according to an embodiment of the present invention.

Referring to fig. 2 and 3, the driving housing 120 has a space in which the compression unit 200 and the motor unit 300 are disposed. Further, the driving housing 120 may form a filter accommodating unit 130 in which the filter unit 500 is disposed.

The filter unit 500 may include a transistor 510, a capacitor assembly 520, and a current sensor assembly 530.

The transistor 510 converts a Direct Current (DC) voltage into a driving voltage of the motor unit 300 through a switching operation. The transistor 510 is disposed at the rear of the filter housing unit 130 and is connected to the control board 410. In this case, the transistor 510 may be an Insulated Gate Bipolar Transistor (IGBT).

The transistor 510 includes six IGBTs including a first phase (U-phase) high switching element, a first phase (U-phase) low switching element, a second phase (V-phase) high switching element, a second phase (V-phase) low switching element, a third phase (W-phase) high switching element, and a third phase (W-phase) low switching element. The transistor 510 is connected to a capacitor assembly 520 and a current sensor assembly 530.

The capacitor assembly 520 is electrically connected to an external power source and receives and stores high voltage DC current. In addition, the capacitor assembly 520 is electrically connected to the transistor 510 and the bus bar assembly 600.

The current sensor assembly 530 detects a current transmitted to the motor unit 300. The current sensor assembly 530 is electrically connected to the transistor 510 and the bus bar assembly 600.

The transistor 510, the capacitor assembly 520, and the current sensor assembly 530 may be mounted on the filter housing unit 130. In this case, the capacitor assembly 520 and the current sensor assembly 530 may be disposed in a first direction (X-axis direction). Further, the transistor 510 may be disposed in a second direction (Y-axis direction) with respect to the capacitor assembly 520 and the current sensor assembly 530. In this case, the first direction (X-axis direction) and the second direction (Y-axis direction) may be perpendicular to each other, and the second direction (Y-axis direction) may be parallel to the axial direction.

The bus bar assembly 600 connects the motor unit 300 and the filter unit 500. The bus bar assembly 600 transmits power from the control board 410 to the motor unit 300. In this case, the bus bar assembly 600 may be electrically connected to the capacitor assembly 520 and the current sensor assembly 530. The bus bar assembly 600 includes a plurality of bus bars, at least one of which may be connected to the capacitor assembly 520, and at least one of which may be connected to the current sensor assembly 530.

The bus bar assembly 600 may be spaced apart from the transistor 510 in a second direction (Y-axis direction), with the capacitor assembly 520 and the current sensor assembly 530 interposed therebetween. In this case, the bus bar assembly 600 may be connected to the motor unit 300 by passing through the filter accommodating unit 130.

A through hole 120H in which the bus bar assembly 600 is disposed may be formed in the driving housing 120. The bus bar assembly 600 may have one end connected to the motor unit 300 and the other end connected to the filter unit 500 based on the through-hole 120H.

The air compressor having the above-described structure minimizes the thickness of the case between the motor unit 300 and the filter unit 500, and compactly arranges components of the filter unit 500 in the filter accommodating unit 130, thereby reducing the size of the air compressor.

The bus bar assembly 600 may include a bus bar 610 and a bus bar fixing member 620.

The bus bar 610 is electrically connected to the motor unit 300. In this case, the bus bar 610 supplies the AC voltage converted by the transistor 510 to the motor unit 300. The bus bar 610 may be provided as a plurality of bus bars 610. The plurality of bus bars 610 may include a U-phase bus bar 611 transmitting AC power of a first phase (U-phase), a V-phase bus bar 612 transmitting AC power of a second phase (V-phase), and a W-phase bus bar 613 transmitting AC power of a third phase (W-phase).

A plurality of bus bars 610 may extend outward from the motor unit 300 in a radial direction. Further, the bus bar 610 may pass through the through-hole 120H and may be bent toward the filter unit 500. In this case, the U-phase bus bar 611 may be bent toward the capacitor assembly 520, and the V-phase bus bar 612 and the W-phase bus bar 613 may be bent toward the current sensor assembly 530.

The ends of the U-phase bus bar 611, the V-phase bus bar 612, and the W-phase bus bar 613 may be exposed from the bus bar fixing member 620 in a state where the ends are spaced apart from each other. In this case, an end of at least one of the plurality of bus bars 610 may be connected to the capacitor assembly 520, and the remaining bus bars of the plurality of bus bars 610 may be connected to the current sensor assembly 530.

According to the embodiment, since the end portions of the bus bar 610 are provided to branch in two directions, an assembly space can be secured between the bus bar 610, the capacitor assembly 520, and the current sensor assembly 530, so that assembly convenience can be improved.

The bus bar fixing member 620 fixes the plurality of bus bars 610 to the case 100 in a state where the plurality of bus bars 610 are insulated. To this end, the bus bar fixing member 620 may include a grommet 621 and a guide member 622.

Grommet 621 is provided in through-hole 120H, and fixes a plurality of bus bars 610 passing through-hole 120H. In this case, the grommet 621 may have elasticity, and may be formed of an insulating material. Preferably, grommet 621 may be formed of a rubber material.

The guide member 622 fixes at least a portion of the plurality of bus bars 610 to the mounting surface 121. In this case, the guide member 622 may guide each end of the plurality of bus bars 610 to the capacitor assembly 520 or the current sensor assembly 530. The guide member 622 may be formed of an insulating material. Preferably, the guide member 622 may be formed of a plastic material.

According to an embodiment, the air compressor according to the present invention includes a plurality of cooling flow passages 700 that cool the motor unit 300. The plurality of cooling flow passages 700 may extend parallel to the axial direction of the rotation shaft (101 in fig. 1). A plurality of cooling flow passages 700 may be embedded in the housing 100 and disposed between the motor unit 300 and the filter unit 500. In this case, the plurality of cooling flow passages 700 may be disposed to be spaced apart from each other in the circumferential direction of the motor unit 300 to surround at least one side of the motor unit 300, and may absorb heat generated by the motor unit 300.

Referring to fig. 3, the air compressor according to the present invention may include a connector unit 800, a cooling cover 900, a discharge resistor 1000, a first fixing member 1100, and a connection member 1200.

The connector unit 800 may apply external power to the filter unit 500 and transmit a signal detected by the filter unit 500 to the control board 410. The connector unit 800 may include a first connector 810 and a second connector 820.

The first connector 810 electrically connects the control board 410 and the current sensor assembly 530. Further, a portion of the first connector 810 is connected to the second connector 820 to check whether the capacitor assembly 520 and the second connector 820 are connected.

Fig. 4 is a partial sectional view of an air compressor according to an embodiment of the present invention, fig. 5 is a plan view of a housing according to an embodiment of the present invention, fig. 6 is a partial sectional view of a front portion of an air compressor according to an embodiment of the present invention, fig. 7 is a partial sectional view of a front portion of an air compressor according to an embodiment of the present invention, fig. 8 is a view showing positions of first and second cooling flow passages in a housing according to an embodiment of the present invention, fig. 9 is a view showing a shape of the first cooling flow passage in fig. 8, fig. 10 is a view showing inflow and outflow structures of a heat exchange medium in fig. 1, fig. 11 is a view showing an internal structure of fig. 1, fig. 12 is a view showing a first embodiment of the cooling flow passage in fig. 1, fig. 13 is a view showing flow of a heat exchange medium in fig. 12, fig. 14 is a view showing a second embodiment of the cooling flow passage in fig. 1, and fig. 15 is a view showing flow of a heat exchange medium in fig. 14.

Referring to fig. 4 to 15, a cooling flow passage 700 passes between the motor unit (300 in fig. 1) and the filter unit (500 in fig. 1). The cooling flow passage 700 absorbs heat from the motor unit 300 and the filter unit 500.

Any one selected from among air, refrigerant, and cooling water may be circulated as a heat exchange medium in the cooling flow passage 700. There are a plurality of cooling flow channels 700, and the plurality of cooling flow channels 700 may be spaced apart from each other in the circumferential direction.

The cooling flow passage 700 may include a first cooling flow passage 710 and a second cooling flow passage 720. The first cooling flow passage 710 may cool the motor unit 300. The second cooling flow passage 720 may cool the filter unit 500.

The case 100 may include an inflow pipe 135 through which the heat exchange medium flows in, and an outflow pipe 140 through which the heat exchange medium having undergone heat exchange inside the case 100 flows out.

The heat exchange medium introduced through the inflow pipe 135 circulates in the first cooling flow passage 710 to cool the motor unit 300. The heat exchange medium moving through the first cooling flow passage 710 may be disposed outside the motor unit 300 to absorb heat generated from the motor unit 300.

The plurality of first cooling flow passages 710 may be arranged and provided in the axial direction of the motor unit 300. In this case, the first cooling flow passage 710 may be arranged such that the heat exchange medium moves along the tubes.

In one embodiment, the first cooling flow passage 710 may be disposed such that one end faces the compression unit 200 and the other end faces the control board 410.

A plurality of first cooling flow channels 710 may be provided along the outer circumferential surface of the motor unit 300, and the first cooling flow channels 710 may be connected by a connection flow channel 711. The connection flow paths 711 may alternately connect one side and the other side of the first cooling flow paths 710 to connect a plurality of first cooling flow paths 710 in series. In order to effectively cool the entire motor unit 300, the first cooling flow path 710 and the connection flow path 711 may be disposed such that the heat exchange medium moving along the first cooling flow path 710 moves in a zigzag pattern.

In one embodiment, the plurality of first cooling flow channels 710 may be arranged in parallel with the adjacent first cooling flow channels 710, and the connection flow channels 711 may be disposed perpendicular to the first cooling flow channels 710.

The second cooling flow passage 720 may cool the control unit 400. The heat exchanger 750 may be disposed in a moving line of the heat exchange medium moving through the second cooling flow passage 720. The heat exchanger 750 may exchange heat with the filter unit 500, which is a part of the control unit 400. The second cooling flow path 720 is disposed inside the heat exchanger 750 such that the heat exchange medium introduced from the first cooling flow path 710 moves inside the heat exchanger 750 and can absorb heat conducted due to contact with the heat exchanger 750.

In one embodiment, heat exchanger 750 may absorb heat from transistor 510, which heats up little.

The cooling cover 900 may be disposed on an upper portion of the heat exchanger 750. The heat exchanger 750 may absorb heat transferred through the cooling cover 900.

Referring back to fig. 11, the heat exchanger 750 may be integrally provided with the cooling cover 900.

Since the cooling cover 900 is provided on the heat exchanger 750, it is possible to reduce a phenomenon in which the cooling cover 900 vibrates due to an external force in a state in which the cooling cover 900 and the heat exchanger 750 are integrally provided. The cooling cover 900 and the heat exchanger 750 may also be integrally formed by injection molding. In addition, the cooling cover 900 and the heat exchanger 750 may be coupled by an adhesive member such as an adhesive.

The second cooling flow passage 720 may be disposed at the rear of the motor unit 300. With this arrangement, a space can be formed inside the drive housing 120, so that a space capable of accommodating components for the control unit can be ensured.

Further, the first cooling flow channel 710 and the second cooling flow channel 720 are connected in series, and the first cooling flow channel 710 and the second cooling flow channel 720 may have an overlap region.

The regions of the second cooling flow path 720 and the first cooling flow path 710 may be provided on the upper and lower portions of the filter unit 500, respectively.

The first cooling flow passage 710 may be disposed parallel to the axial direction of the motor unit 300. The plurality of first cooling flow passages 710 are provided outside the motor unit 300, and are connected through a connection flow passage 711. The second cooling flow path 720 is provided to intersect the first cooling flow path 710, and a connection flow path 711 connected to the first cooling flow path 710 may be provided with a region where the second cooling flow path 720 overlaps. The cooling efficiency can be improved by this overlap region.

The second cooling flow path 720 may include a 2-1 cooling flow path 721 and a 2-2 cooling flow path 722.

The 2-1 th cooling flow passage 721 may be provided on an upper portion of the filter unit 500, and the 2-2 nd cooling flow passage 722 may be provided on a lower portion of the filter unit 500.

The second cooling flow path 720 may have a branched structure inside the heat exchanger 750. In one embodiment, the heat exchanger 750 may include a first heat exchange channel 751 and a second heat exchange channel 752, with the 2-1 cooling flow path 721 disposed in the first heat exchange channel 751 and the 2-2 cooling flow path 722 disposed in the second heat exchange channel 752.

The heat exchange medium passing through the first cooling flow passage 710 flows into the heat exchanger 750. The heat exchange medium flowing into the heat exchanger 750 is branched from one side of the heat exchanger 750 and moves to the first heat exchange passage 751 provided in the 2-1 cooling flow path 721 and the second heat exchange passage 752 provided in the 2-2 cooling flow path 722.

In one embodiment, the transistor 510 may be disposed between the first heat exchange channel 751 and the second heat exchange channel 752. The 2-1 th cooling flow channel 721 and the 2-2 nd cooling flow channel 722 respectively provided on the upper and lower portions of the transistor 510 may absorb heat generated from the transistor 510 to improve cooling efficiency.

In addition, an upper side of the 2-2 cooling flow path 722 may contact the transistor 510 to cool the transistor 510, and a lower side of the 2-2 cooling flow path 722 may contact the motor unit 300 to absorb heat generated from the motor unit 300 and cool the motor unit 300, thereby improving cooling efficiency.

The plurality of second cooling flow passages 720 may reduce the overall temperature of the compression unit 200 by adjusting the differential pressure of the cooling flow passages of the entire compressor using the plurality of cooling flow passages through the transistor 510.

Referring to fig. 12 to 15, the cooling flow path of the entire air compressor passes through the compression unit 200 to the control unit 400 and becomes a contact surface with the filter unit 500 of the control unit 400 and the transistor 510 among the components of the filter unit 500. In this case, the first cooling flow passage 710 for cooling the compression unit 200 and the second cooling flow passage 720 for cooling the control unit 400 may be connected in series to form an integrated cooling flow passage.

In addition, durability of the transistor 510 against heat can be improved by direct contact with the transistor 510 generating a large amount of heat.

In the case where the heat exchanger 750 shown in fig. 12 and 13 is arranged to cool one side of the transistor 510, even if only one side is cooled, the overlapping region is provided to satisfy a guaranteed temperature for cooling the transistor, thereby reducing costs and improving assemblability.

In the case where the heat exchanger 750 shown in fig. 14 and 15 is arranged to cool both sides of the transistor 510, it can be seen that the cooling efficiency is further improved in the case where both sides are cooled, compared to the case where one side is cooled.

Fig. 16 is a perspective view of a cover according to an embodiment of the present invention.

Referring to fig. 16, the cooling cover 900 may include a main body 910, a fixing unit 920, a connector fixing unit 930, and a resistor fixing unit 940.

The body 910 may be disposed on an upper side of the transistor 510 to cover at least a portion of an upper surface and a side surface of the transistor 510. In this case, the body 910 may absorb heat generated from the transistor 510 to prevent the transistor 510 from overheating. The body 910 may include at least one of aluminum, synthetic resin, and steel.

The fixing units 920 are plural, and each fixing unit 920 may extend from an edge of the main body 910. The plurality of fixing units 920 may be integrally formed with the main body 910 and made of the same material as the main body 910. In this case, the plurality of fixing units 920 may be coupled to the first case (120 in fig. 2) by fastening bolts.

The connector fixing unit 930 may be disposed on the upper surface 911 of the main body 910. Further, the connector fixing unit 930 may fix the connector unit 800 passing through the upper side of the cooling cover 900. The connector fixing unit 930 protrudes upward from the upper surface of the main body 910, and may include a fixing hole 931 into which the fixing clip 830 is inserted. In this case, the end of the fixing clip 830 is inserted into the fixing hole 931 so that the movement can be fixed.

The resistor fixing unit 940 may be fastened to the discharge resistor 1000. More specifically, the resistor fixing unit 940 may be fastened to the first fixing member 1100 for fixing the discharge resistor 1000.

The resistor fixing units 940 are plural, and the plural resistor fixing units 940 may be spaced apart in the first direction (X-axis direction). In this case, the discharge resistor 1000 may be disposed between a plurality of resistor fixing units 940 spaced apart from each other. In this case, the separation distance D between the plurality of resistor fixing units 940 in the first direction (X-axis direction) may be greater than the width of the discharge resistor 1000.

The cooling cover 900 may be a rectangular member. The width WC1 of the cooling cover 900 in the first direction (X-axis direction) may be larger than the width WC2 in the second direction (Y-axis direction).

While the foregoing description has been with reference to the preferred embodiments of the present invention, it will be understood by those skilled in the art that various changes and modifications may be made therein without departing from the spirit and scope of the invention as described in the following claims.

< description of reference numerals >

100: housing, 101: rotation axis, 110: impeller housing, 120: drive housing, 135: inflow tube, 140: outflow tube, 200: compression unit, 300: motor unit, 310: rotor, 320: stator, 400: control unit, 410: control panel, 500: filter unit, 510: transistor, 600: bus bar assembly, 620: bus bar fixing member, 700: cooling flow passage, 710: first cooling flow passage, 711: connecting flow channel, 720: second cooling flow passage 721: 2-1 cooling flow passage, 722: 2 nd-2 cooling flow passage, 750: heat exchanger, 751: first heat exchange channel, 752: second heat exchange channel, 800: connector unit, 900: cooling cover

Claims (20)

1. An air compressor, the air compressor comprising:

a housing;

a rotation shaft provided inside the housing;

a compression unit connected to the rotation shaft and compressing and discharging introduced air;

a motor unit driving the rotation shaft;

a control board that controls the motor unit; and

a filter unit that filters noise of external power and supplies the external power to the control board,

wherein the housing includes a first cooling flow passage for cooling the motor unit and a second cooling flow passage for cooling the filter unit, and the first cooling flow passage communicates with the second cooling flow passage.

2. The air compressor of claim 1, wherein the first cooling flow passage is disposed in an axial direction of the motor unit.

3. The air compressor of claim 1, wherein the first cooling flow passage is provided as a plurality of first cooling flow passages.

4. The air compressor of claim 3, wherein the plurality of first cooling flow passages are connected by a connecting passage,

the connection channels are arranged such that the heat exchange medium moving in the first cooling flow passage moves in a zigzag pattern.

5. The air compressor of claim 1, wherein the second cooling flow passage is disposed along a radial direction of the motor unit.

6. The air compressor of claim 5, wherein the second cooling flow passage is in heat exchange relationship with the filter unit configuration.

7. The air compressor of claim 6, wherein the second cooling flow passage is disposed inside a heat exchanger.

8. The air compressor of claim 7, wherein heat exchange is performed on at least one surface of the heat exchanger.

9. The air compressor of claim 5, wherein the second cooling flow passage is disposed aft of the motor unit.

10. The air compressor of claim 1, wherein the first cooling flow passage and the second cooling flow passage are connected in series.

11. The air compressor of claim 10, wherein regions of the second cooling flow passage and the first cooling flow passage are provided on an upper portion and a lower portion of the filter unit, respectively.

12. The air compressor of claim 8, wherein the filter unit includes a transistor,

the heat exchanger exchanges heat with the transistor.

13. The air compressor of claim 8, wherein the second cooling flow passage includes a 2-1 cooling flow passage and a 2-2 cooling flow passage.

14. The air compressor of claim 13, wherein the 2-1 cooling flow passage is provided on an upper portion of the filter unit and the 2-2 cooling flow passage is provided on a lower portion of the filter unit.

15. The air compressor of claim 14, wherein one side of the heat exchanger is in heat exchange with the filter unit and the other side of the heat exchanger is in heat exchange with the motor unit.

16. The air compressor of claim 15, wherein the heat exchanger includes a first heat exchange channel and a second heat exchange channel, the 2-1 cooling flow passage being disposed in the first heat exchange channel, and the 2-2 cooling flow passage being disposed in the second heat exchange channel.

17. The air compressor of claim 1, wherein the housing includes an impeller housing and a drive housing,

the motor unit is disposed in the drive housing,

a receiving unit is formed at both sides of an upper portion of the motor unit, and the filter unit is disposed in the receiving unit.

18. The air compressor of claim 17, wherein at least one of the receiving units is connected to a connector unit.

19. The air compressor of claim 1, wherein the motor unit includes a rotor disposed outside the rotary shaft and a stator disposed on the outside of the rotary shaft,

the stator includes teeth and shoes disposed at ends of the teeth,

at the end of the shoe facing the rotor, a groove is provided offset from the centerline of the tooth.

20. The air compressor of claim 7, comprising a cooling cover disposed over the heat exchanger,

wherein the cooling cover and the heat exchanger are integrally provided.