air compressor

Abstract

The present invention relates to an air compressor that improves space utilization of a filter unit and reduces the number of components constituting the filter unit, thereby improving assemblability, reducing manufacturing costs, and minimizing the size of the air compressor itself. The air compressor includes: a housing; a rotating shaft extending longitudinally within the housing; a compression unit disposed in front of the rotating shaft and rotating on the rotating shaft to compress and discharge incoming air; a motor unit that rotates the rotating shaft; a control board that controls the motor unit; a filter unit that supplies external power to the control board and filters noise from the power; and a busbar assembly that transmits power from the control board to the motor unit.

Description

Technical Field

[0001] The present invention relates to an air compressor, and more particularly, to an air compressor including a control board for controlling and driving a motor. Background Art

[0002] Generally, a fuel cell vehicle refers to a vehicle in which hydrogen and oxygen are supplied to a humidifier and electric energy generated by an electrochemical reaction (which is a reverse reaction of the electrolysis of water) is supplied as a driving force of the vehicle, and a typical fuel cell vehicle is disclosed in Korean Patent Registration No. 0962903.

[0003] Typically, an 80kW fuel cell stack is installed in a passenger fuel cell vehicle, and when the fuel cell stack operates under pressurized conditions, air at a high pressure of 1.2 to 3.0 bar is supplied to the fuel cell stack, and for this purpose, an air compressor with a rotation number of 5,000 to 100,000 rpm should be used.

[0004] A fuel cell vehicle typically includes a fuel cell stack that generates electricity, a humidifier that humidifies fuel and air and supplies the humidified fuel and air to the fuel cell stack, a fuel supply unit that supplies hydrogen to the humidifier, an air supply unit that supplies oxygen-containing air to the humidifier, a cooling module for cooling the fuel cell stack, and the like.

[0005] The air supply unit includes an air purifier that filters foreign matter contained in the air, an air compressor that compresses and supplies the air filtered by the air purifier, and a control box that controls the air compressor.

[0006] The above-mentioned air compressor uses an impeller to compress air drawn from the outside and then discharges the compressed air to the fuel cell stack through a discharge port. In this case, the impeller and shaft constituting the compression unit are driven by the rotational force of the motor.

[0007] The inverter supplies power to the 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.

[0008] However, conventional air compressors have a problem in that when the motor and inverter are integrated, space utilization is reduced, resulting in an increase in the size of the air compressor. Furthermore, when installing a noise filter unit that removes noise from externally supplied power, there is a problem in that the number of components and the number of assembly steps increase, thereby increasing manufacturing costs.

[0009] Related Art (Patent Document 1) Korean Patent No. 0962903 (registered on June 1, 2010) Summary of the Invention

[0010] Technical issues

[0011] The present invention is intended to solve the above-mentioned problems and to provide an air compressor in which space utilization between a motor and a filter unit that removes noise of power supplied to the motor is improved and an assembling process of the filter unit is simplified.

[0012] The objectives to be solved by the present invention are not limited to the above objectives, and those skilled in the art can clearly understand the above other objectives through the following description.

[0013] Technical Solution

[0014] One aspect of the present invention provides an air compressor, which includes: a housing; a rotating shaft extending in a longitudinal direction in the housing; a compression unit, which is arranged in front of the rotating shaft and rotates by the rotating shaft to compress and discharge introduced air; a motor unit, which rotates the rotating shaft; a control board, which controls the motor unit; a filter unit, which supplies external power to the control board and filters noise of the power; and a bus bar assembly, which transmits power from the control board to the motor unit.

[0015] The filter unit may be disposed outside the motor unit in a radial direction.

[0016] The bus bar assembly may include: a plurality of bus bars electrically connected to the motor unit; and a bus bar fixing member fixing the plurality of bus bars to the case in a state in which the plurality of bus bars are insulated.

[0017] The plurality of bus bars may extend outward from the motor unit in the radial direction, and each end portion of the plurality of bus bars may be bent in at least two directions.

[0018] The ends of the plurality of bus bars may be exposed from the bus bar fixing member in a state in which the ends of the plurality of bus bars are spaced apart from each other.

[0019] The filter unit may include: a transistor connected to the control board; a capacitor assembly connected to one side of the transistor; and a current sensor assembly connected to the other side of the transistor, wherein the capacitor assembly and the current sensor assembly may be arranged at both sides relative to the bus bar assembly.

[0020] The multiple bus bars may include: a U-phase bus bar, the upper end of which is bent toward the capacitor assembly; and a V-phase bus bar and a W-phase bus bar, the ends of which are bent toward the current sensor assembly, wherein the U-phase bus bar can be electrically connected to the capacitor assembly, and the V-phase bus bar and the W-phase bus bar can be electrically connected to the current sensor assembly.

[0021] The capacitor assembly may include: a case; a capacitor module embedded in the case; and a power transmission bus bar connected to the U-phase bus bar.

[0022] The power transmission bus bar may be integrally formed with the housing by an injection molding method.

[0023] The power transmission bus bar may be assembled with the housing.

[0024] The housing may include a filter accommodation unit accommodating the filter unit.

[0025] The filter accommodating unit may include at least one mounting surface on which the filter unit is mounted, and at least one weight-saving recessed portion may be formed in the mounting surface in which the filter unit is disposed.

[0026] A plurality of coupling areas may be provided on the mounting surface, the capacitor assembly, the current sensor assembly, and the bus bar assembly being coupled therein, and all of the plurality of coupling areas may be positioned coplanar with one another.

[0027] The air compressor may further include a plurality of cooling paths provided between the motor unit and the filter unit, wherein the plurality of cooling paths may be provided to be spaced apart from each other in a circumferential direction of the motor unit to surround at least one side of the motor unit.

[0028] The bus bar assembly may be disposed to pass between the plurality of cooling paths spaced apart from each other.

[0029] The air compressor may include a connector unit through which a high-voltage direct current (DC) current is applied to the filter unit and a signal detected by the filter unit is transmitted to the control board.

[0030] The connector unit may include: a first connector electrically connecting the control board and the current sensor assembly; and a second connector electrically connecting an external power supply and the capacitor assembly, and through which a high-voltage DC current is applied to the capacitor assembly.

[0031] The first connector may include an interlock wire electrically connected to the second connector and checking whether the capacitor assembly and the second connector are connected.

[0032] The transistor may be an insulated gate bipolar transistor (IGBT).

[0033] The air compressor may include a cooling cover provided to cover at least one surface of the transistor and absorb heat of the transistor.

[0034] The cooling cover may include a connector fixing portion to fix one side of the connector unit.

[0035] The housing may include a second accommodation unit in which the control board is disposed, and the first accommodation unit and the second accommodation unit may be disposed to be orthogonal to each other.

[0036] Beneficial effects

[0037] In the air compressor according to the present invention, by improving space utilization of the filter unit and reducing the number of components constituting the filter unit, assemblability can be improved, manufacturing costs can be reduced, and the size of the air compressor can be minimized.

[0038] According to the present invention, it is possible to improve the assembly convenience of an air compressor by implementing each end of a bus bar to which three-phase current is applied as a structure branched in two directions to ensure sufficient assembly space for a filter unit and the bus bar.

[0039] Various useful advantages and effects of the present invention are not limited to the above and can be more easily understood although specific embodiments of the present invention are described. BRIEF DESCRIPTION OF THE DRAWINGS

[0040] Figure 1 is a cross-sectional view showing an air compressor according to one embodiment of the present invention.

[0041] Figure 2and Figure 3 is a plan view showing an air compressor according to one embodiment of the present invention.

[0042] Figure 4 is a plan view illustrating a housing included in an air compressor according to one embodiment of the present invention.

[0043] Figure 5 is a partial cross-sectional view showing an air compressor according to one embodiment of the present invention.

[0044] Figure 6 and Figure 7 is a perspective view illustrating a first example of a capacitor assembly included in an air compressor according to one embodiment of the present invention.

[0045] Figure 8 is a perspective view illustrating a second example of a capacitor assembly included in an air compressor according to one embodiment of the present invention.

[0046] Figure 9 is a plan view showing a connector unit and a cooling cover mounted on an air compressor according to one embodiment of the present invention.

[0047] Figure 10 It shows Figure 9 A perspective view of the connector unit is shown.

[0048] Figure 11 It shows Figure 9 A perspective view of the cooling cover is shown.

[0049] Figure 12 2 is a diagram showing a second example of the cooling cover. DETAILED DESCRIPTION

[0050] Hereinafter, exemplary embodiments of the present specification will be described in detail with reference to the accompanying drawings.

[0051] However, the technical spirit of the present invention is not limited to some embodiments to be described and can be implemented using various other embodiments, and one or more components of the embodiments can be selectively connected, replaced, and used within the scope of the technical spirit of the present invention.

[0052] In addition, unless otherwise clearly defined and specifically limited by the context, all terms (including technical terms and scientific terms) used in this document may be interpreted as having the meanings commonly understood by those skilled in the art, and the meanings of commonly used terms (such as terms defined in commonly used dictionaries) will be interpreted as taking into account the contextual meanings of the relevant technology.

[0053] Furthermore, the terms used in the embodiments of the present invention are to be considered as descriptive only and not limiting of the present invention.

[0054] In this specification, unless the context clearly indicates otherwise, the singular includes the plural, and in the case of describing "at least one (or one or more) of A, B and C", this may include at least one combination of all possible combinations of A, B and C.

[0055] Furthermore, in the description of components of the present invention, terms such as “first,” “second,” “A,” “B,” “(a),” and “(b)” may be used.

[0056] The terms are used only to distinguish one element from another element, and the nature, order, etc. of the elements are not limited to the terms.

[0057] In addition, when an element is referred to as being “connected,” “coupled” or “linked” to another element, such description may include the case where the element is directly connected or coupled to another element as well as the case where the element is connected, coupled or linked to another element with another element disposed therebetween.

[0058] Furthermore, when any element is described as being formed or disposed “on” or “under” another element, such description includes both a case where the two elements are formed or disposed in direct contact with each other and a case where one or more other elements are interposed between the two elements. Furthermore, when an element is described as being formed “on or under” another element, such description includes a case where one element is formed on the upper side or the lower side relative to the other element.

[0059] Hereinafter, the embodiments will be described in detail with reference to the accompanying drawings, and components that are the same or correspond to each other will be denoted by the same reference numerals throughout the drawings, and redundant descriptions will be omitted.

[0060] exist Figures 1 to 12 In the drawings, only main parts are clearly shown for a clear understanding of the present invention conceptually, and therefore, various variations of the drawings are expected, and the scope of the present invention is not necessarily limited by the specific shapes shown in the drawings.

[0061] Figure 1 is a cross-sectional view showing an air compressor according to one embodiment of the present invention, Figure 2 and Figure 3 is a plan view showing an air compressor according to one embodiment of the present invention, Figure 4 is a plan view illustrating a housing included in an air compressor according to one embodiment of the present invention.

[0062] Reference Figures 1 to 4The air compressor may include a housing 100 , a compression unit 200 , a motor unit 300 , a control board 400 , a filter unit 500 , and a bus bar assembly 600 .

[0063] The housing 100 constitutes an exterior, and the rotating shaft 110 , the compression unit 200 , and the motor unit 300 are disposed in the housing 100 .

[0064] The compression unit 200 is provided at the front side in the housing 100. In this case, the front side is provided in a direction from the motor unit 300 toward the compression unit 200, and the rear side is provided in a direction opposite to the direction toward the front side.

[0065] The motor unit 300 is used to rotationally drive the rotating shaft 110 to supply driving force to the compression unit 200. In this case, the motor unit 300 includes a rotor 310 and a stator 320. The stator 320 includes a drive coil, and when power is supplied from the outside, the drive coil generates an electromagnetic force. Therefore, the rotor 310 can rotate due to the electromagnetic interaction between the rotor 310 and the stator 320. At the same time, one side of the rotor 310 is connected to the compression unit 200 to drive the compression unit 200. In this case, the drive coil can be operated by receiving three-phase alternating current (AC) power.

[0066] Circuits and elements for controlling the motor unit 300 are mounted on the control board 400. In this case, the control board 400 may be a printed circuit board (PCB).

[0067] As an embodiment, the housing 100 may include a second accommodation unit 420 , and the control board 400 is disposed in the second accommodation unit 420 .

[0068] The control board 400 may be disposed in the second accommodation unit 420, which is positioned behind the rotating shaft 110 and the motor unit 300 and may be spaced apart from the rear end of the rotating shaft 110. In this case, the control board 400 may be formed in a substrate shape and disposed so that the thickness direction is directed in the axial direction of the rotating shaft 110.

[0069] The filter unit 500 receives external power and supplies the external power to the control board 400 in a state of removing noise of the power. In this case, the filter unit 500 may be provided outside the motor unit 300 in a radial direction.

[0070] The bus bar assembly 600 transmits power from the control board 400 to the motor unit 300. In this case, 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.

[0071] The housing 100 includes a first accommodation unit 120 accommodating the filter unit 500 at one side. In this case, the first accommodation unit 120 may be disposed outside the motor unit 300 in a radial direction.

[0072] In addition, the housing 100 may include at least one mounting surface 121 provided in the first accommodation unit 120 and on which the filter unit 500 is mounted. According to the present embodiment, the filter unit 500 may be mounted on one mounting surface 121 .

[0073] In addition, the first receiving unit 120 and the second receiving unit 420 may be disposed orthogonally to each other to minimize interference between the receiving units and improve ease of packaging due to efficient space utilization.

[0074] At least one weight-saving recess 121G may be formed on the mounting surface 121. In this case, at least one of the capacitor assembly 520 and the current sensor assembly 530 may be disposed in the weight-saving recess 121G. Furthermore, a through-hole 120H through which the bus bar assembly 600 passes may be formed in the mounting surface 121. In this case, one end of the bus bar assembly 600 is electrically connected to the motor unit 300, and the other end may be electrically connected to the filter unit 500, relative to the through-hole 120H.

[0075] Therefore, the size of the air compressor may be reduced by minimizing the thickness of the case between the motor unit 300 and the filter unit 500 and compactly arranging components of the filter unit 500 in the first accommodation unit 120 .

[0076] The filter unit 500 may include a transistor 510 , a capacitor component 520 , and a current sensor component 530 .

[0077] 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 behind the first receiving unit 120 and is connected to the control board 400. In this case, the transistor 510 may be an insulated gate bipolar transistor (IGBT).

[0078] Transistor 510 includes six IGBTs, each of which includes a first phase (Phase U) high switching element, a first phase (Phase U) low switching element, a second phase (Phase V) high switching element, a second phase (Phase V) low switching element, a third phase (Phase W) high switching element, and a third phase (Phase W) low switching element. Transistor 510 is connected to capacitor assembly 520 and current sensor assembly 530.

[0079] The capacitor assembly 520 is electrically connected to an external power source and receives and stores a high voltage DC current. In addition, the capacitor assembly 520 is electrically connected to the transistor 510 and the bus bar assembly 600 .

[0080] The current sensor assembly 530 detects the 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. In this case, the bus bar assembly 600 and the transistor 510 may be provided with the capacitor assembly 520 and the current sensor assembly 530 interposed therebetween.

[0081] The transistor 510, the capacitor assembly 520, and the current sensor assembly 530 may be coupled to the mounting surface 121. In this case, a plurality of coupling regions 120A for coupling the transistor 510, the capacitor assembly 520, and the current sensor assembly 530 may be provided on the mounting surface 121. In addition, coupling holes for bolt coupling may be formed in the plurality of coupling regions 120A.

[0082] The plurality of coupling regions 120A may be positioned coplanar with each other. Therefore, in the process of coupling the transistor 510 , the capacitor assembly 520 , and the current sensor assembly 530 to the mounting surface 121 , size management may be easy and working time may be reduced.

[0083] Figure 5 is a partial cross-sectional view showing an air compressor according to one embodiment of the present invention.

[0084] refer to Figure 3 and Figure 5 , the bus bar assembly 600 may include a bus bar 610 and a bus bar fixing member 620 .

[0085] 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 that transmits AC power of a first phase (phase U), a V-phase bus bar 612 that transmits AC power of a second phase (phase V), and a W-phase bus bar 613 that transmits AC power of a third phase (phase W).

[0086] The plurality of busbars 610 may extend radially outward from the motor unit 300. Furthermore, the busbars 610 may pass through the through-holes 120H and may be bent in at least two directions. In this case, the U-phase busbar 611 may be bent toward the capacitor assembly 520, and the remaining V-phase and W-phase busbars 612 and 613 may be bent toward the current sensor assembly 530.

[0087] Each end portion 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 portion 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.

[0088] According to the present embodiment, since the end portion of the bus bar 610 is 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 , thereby improving assembly convenience.

[0089] The bus bar fixing member 620 fixes the bus bar 610 to the case 100 in a state in which 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.

[0090] The grommet 621 is provided in the through hole 120H and fixes the plurality of bus bars 610 passing through the through hole 120H. In this case, the grommet 621 may have elasticity and may be formed of an insulating material. Preferably, the grommet 621 may be formed of a rubber material.

[0091] 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 can 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 can be formed of an insulating material. Preferably, the guide member 622 can be formed of a plastic material.

[0092] According to this embodiment, the air compressor according to the present invention includes a plurality of cooling paths 700 that cool the motor unit 300 .

[0093] The plurality of cooling paths 700 may be embedded in the housing 100 and provided between the motor unit 300 and the filter unit 500. In this case, the plurality of cooling paths 700 may be provided to be spaced apart from each other in the circumferential direction of the motor unit 300 so as to surround at least one side of the motor unit 300 and absorb heat generated by the motor unit 300.

[0094] The bus bar assembly 600 may be provided to pass through a plurality of cooling paths 700 spaced apart from each other. In this case, the plurality of cooling paths 700 may also absorb heat generated by the bus bar 610 to prevent the bus bar 610 from being overheated.

[0095] Figure 6 and Figure 7is a perspective view illustrating a first example of a capacitor assembly included in an air compressor according to one embodiment of the present invention.

[0096] Reference Figure 6 and Figure 7 , the capacitor assembly 520 may include a housing 521 , a capacitor module (not shown), a power transmission bus bar 522C, and a plurality of connection terminals 522 .

[0097] The housing 521 forms a space therein, and a capacitor module (not shown) is embedded in the housing 521. The housing 521 may be formed of an insulating material. Preferably, the housing 521 may be formed of a plastic material.

[0098] The capacitor module (not shown) may be a multilayer ceramic capacitor or a thin film capacitor.

[0099] The power transmission bus bar 522C is electrically connected to the bus bar assembly 600. In this case, the power transmission bus bar 522C may be integrally formed with the housing 521. In this case, the power transmission bus bar 522C and the housing 521 may be integrally formed in an insert injection molding method, but are not limited thereto.

[0100] The plurality of connection terminals 522 may include input terminals 522P1 and 522N1 connected to a connector unit 800 (which will be described below), output terminals 522P2 and 522N2 connected to the transistor 510, and a ground terminal 522G grounded to the housing 100. In this case, the plurality of connection terminals 522 may be integrally formed with the housing 521.

[0101] According to this embodiment, in the capacitor assembly 520 , the power transmission bus bar 522C may be formed integrally with the housing 521 to ensure insulation of the power transmission bus bar 522C, reduce the number of components, and improve assemblability.

[0102] Figure 8 is a perspective view illustrating a second example of a capacitor assembly included in an air compressor according to one embodiment of the present invention.

[0103] Reference Figure 8 The capacitor assembly 540 may include a housing 541 , a capacitor module (not shown), a power transmission bus bar 542C, and a plurality of connection terminals 542 .

[0104] The housing 541 supports a capacitor module (not shown), a power transmission bus bar 542C, and a plurality of connection terminals 542. In this case, the power transmission bus bar 542C may be assembled with the housing 541. The power transmission bus bar 542C and the housing 541 may be separately provided and detachably coupled to each other.

[0105] Figure 9 is a plan view showing a connector unit and a cooling cover mounted on an air compressor according to one embodiment of the present invention, Figure 10 It shows Figure 9 A perspective view of the connector unit is shown, and Figure 11 It shows Figure 9 A perspective view of the cooling cover is shown.

[0106] Reference Figure 9 and Figure 10 According to one embodiment of the present invention, the air compressor may further include a connector unit 800 through which external power is applied to the filter unit 500 and a signal detected by the filter unit 500 is transmitted to the control board 400 .

[0107] The connector unit 800 includes a first connector 810 , a second connector 820 , and a fixing clip 830 .

[0108] The first connector 810 electrically connects the control board 400 and the current sensor assembly 530. In addition, a portion of the first connector 810 is connected to the second connector 820 to check whether the second connector 820 and the capacitor assembly 520 are connected. To this end, the first connector 810 may include a first terminal 811, a second terminal 812, a first wire 813, and an interlock wire 814.

[0109] The first terminal 811 is connected to the current sensor assembly 530, and the second terminal 812 is separated from the first terminal 811 and connected to the control board 400. In this case, the first wire 813 is provided as six first wires 813 and can be electrically connected to the first terminal 811 and the second terminal 812.

[0110] In this case, the plurality of first wires 813 may be bound using a tape B. In addition, the plurality of first wires 813 may be provided to pass over the transistor 510 . In this case, a fixing clip 830 is mounted on the transistor 510 to fix movement of the plurality of first wires 813 .

[0111] The interlock wire 814 may be electrically connected to the second terminal 812 and the second connector 820. In this case, the interlock wire 814 may be connected to an interlock pin (not shown) to be described below.

[0112] Second connector 820 electrically connects an external power source and capacitor assembly 520 to apply a high voltage DC current to capacitor assembly 520. To this end, second connector 820 may include a shielding member 821, a second cable 822, high voltage electrodes 823N1 and 823P1, and an interlocking pin (not shown).

[0113] The shielding member 821 may be installed at one side of the housing 100. In this case, the shielding member 821 may be formed of an insulating material. The shielding member 821 may be coupled to the second cable 822 to fix the second cable 822 to the housing 100.

[0114] The second cables 822 may extend from the shielding member 821 toward the capacitor assembly 520. In this case, the second cables 822 may be provided as two second cables 822.

[0115] High voltage electrodes 823N1 and 823P1 may be provided on ends of the two second cables 822. In this case, the high voltage electrodes 823N1 and 823P1 may be connected to the input terminals 522P1 and 522N1 of the capacitor assembly 520.

[0116] An interlocking pin (not shown) may be embedded in the shielding member 821. In this case, the interlocking pin (not shown) may be connected to an interlocking cable.

[0117] Reference Figure 11 According to one embodiment of the present invention, the air compressor may further include a cooling cover 900 for cooling the transistor 510 .

[0118] The cooling cover 900 is fixedly mounted on the mounting surface 121 in a state where the cooling cover 900 covers at least one surface of the transistor 510. To this end, the cooling cover 900 may include a body 910 and a plurality of fixing portions 920.

[0119] The body 910 may be provided on the transistor 510 and may cover at least a portion of the side surface and the upper surface of the transistor 510. In this case, the body 910 may absorb heat generated by the transistor 510 and prevent the transistor 510 from overheating. The body 910 may include at least one of aluminum, a synthetic resin material, and steel.

[0120] The plurality of fixing portions 920 may extend from the edge of the body 910. The plurality of fixing portions 920 may be integrally formed with the body 910 and formed of the same material as the body 910. In this case, the plurality of fixing portions 920 may be coupled to the mounting surface 121 by coupling bolts, but is not limited thereto.

[0121] Figure 12 10 is a diagram showing a second example of the cooling cover 1000 .

[0122] Reference Figure 12The cooling cover 1000 may include a main body 1010, a plurality of fixing portions 1020, and a connector fixing portion 1030. In this case, the main body 1010 may be disposed on the transistor 510 and may cover at least a portion of the side surface and the upper surface of the transistor 510. In this case, the main body 1010 may absorb heat generated by the transistor 510 and prevent the transistor 510 from overheating. The main body 1010 may include at least one of aluminum, a synthetic resin material, and steel.

[0123] The plurality of fixing portions 1020 may extend from the edge of the body 1010. The plurality of fixing portions 1020 may be integrally formed with the body 1010 and formed of the same material as the body 1010. In this case, the plurality of fixing portions 1020 may be coupled to the mounting surface 121 by coupling bolts, but is not limited thereto.

[0124] The connector fixing portion 1030 may be provided on the upper surface of the main body 1010. The connector fixing portion 1030 may fix the connector unit 800 passing over the cooling cover 1000. The connector fixing portion 1030 may protrude upward from the upper surface of the main body 1010, and a fixing hole 1031 into which the fixing clip 830 is inserted may be formed in the connector fixing portion 1030. In this case, the end of the fixing clip 830 may be inserted into the fixing hole 1031, thereby preventing the fixing clip 830 from moving.

[0125] In the air compressor according to the embodiment of the present invention, by improving space utilization of the filter unit and reducing the number of components constituting the filter unit, assemblability may be improved, cost may be reduced, and size may be minimized.

[0126] As described above, the embodiments of the present invention have been described in detail with reference to the accompanying drawings.

[0127] The above description is merely an example of describing the technical scope of the present invention. Without departing from the spirit and scope of the present invention, those skilled in the art may make various changes, modifications and substitutions. Therefore, the embodiments and drawings disclosed above should be considered as illustrative only and not limiting the technical scope. The technical scope of the present invention is not limited by the embodiments and drawings. The scope of the present invention should be interpreted by the appended claims and encompasses all equivalents that fall within the scope of the appended claims.

[0128] Reference numerals

[0129] 100: Shell

[0130] 110: Rotation axis

[0131] 120: First accommodation unit

[0132] 200: Compression unit

[0133] 300: Motor unit

[0134] 400: Control Panel

[0135] 420: Second accommodation unit

[0136] 500: Filter unit

[0137] 600: Busbar assembly

[0138] 610: Busbar

[0139] 620: Fixed components

[0140] 700: Cooling path

[0141] 800: Connector unit

[0142] 900, 1000: Cooling cover

Claims

1. An air compressor, comprising: case; a rotating shaft extending in a longitudinal direction in the housing; a compression unit provided at a front portion of the rotating shaft and rotated by the rotating shaft to compress and discharge introduced air; a motor unit that rotates the rotating shaft; a control board, the control board controlling the motor unit; a filter unit that supplies external power to the control board and filters noise of the power; as well as a bus bar assembly that transmits power from the control board to the motor unit, Wherein, the filter unit includes: a transistor connected to the control board; a capacitor component connected to one side of the transistor; and a current sensor assembly connected to the other side of the transistor, wherein the capacitor assembly and the current sensor assembly are arranged at both sides of the bus bar assembly, Wherein, the busbar assembly comprises: a plurality of bus bars electrically connected to the motor unit; and a bus bar fixing member that fixes the plurality of bus bars to the housing in a state where the plurality of bus bars are insulated, An end portion of at least one of the plurality of bus bars is connected to the capacitor assembly, and ends of the remaining bus bars extend in an opposite direction of the end portion of the at least one bus bar connected to the capacitor assembly to be connected to the current sensor assembly.

2. The air compressor according to claim 1, wherein The filter unit is disposed outside the motor unit in a radial direction.

3. The air compressor according to claim 1, wherein: The plurality of bus bars extend outwardly from the motor unit in a radial direction; and Each end portion of the plurality of bus bars is bent in at least two directions.

4. The air compressor according to claim 3, wherein: The end portions of the plurality of bus bars are exposed from the bus bar fixing member in a state in which the end portions of the plurality of bus bars are spaced apart from each other.

5. The air compressor according to claim 1, wherein The plurality of bus bars include: a U-phase bus bar extending toward the capacitor assembly; and a V-phase bus bar and a W-phase bus bar, the V-phase bus bar and the W-phase bus bar extending toward the current sensor assembly, wherein the U-phase busbar is electrically connected to the capacitor assembly, and The V-phase bus bar and the W-phase bus bar are electrically connected to the current sensor assembly.

6. The air compressor according to claim 5, wherein The capacitor assembly comprises: shell; a capacitor module embedded in the housing; and A power transmission bus bar is connected to the U-phase bus bar.

7. The air compressor according to claim 6, wherein: The power transmission bus bar is integrally formed with the housing by an injection molding method.

8. The air compressor according to claim 6, wherein The power transmission bus bar is assembled with the housing.

9. The air compressor according to claim 1, wherein The housing includes a first accommodation unit that accommodates the filter unit.

10. The air compressor according to claim 9, wherein: The first accommodation unit includes at least one mounting surface, and the filter unit is mounted on the at least one mounting surface; and At least one weight-saving recessed portion is formed in the mounting surface, and a portion of the filter unit is disposed in the weight-saving recessed portion.

11. The air compressor according to claim 10, wherein: A plurality of coupling areas are provided on the mounting surface, wherein the capacitor assembly, the current sensor assembly, and the bus bar assembly are coupled to the plurality of coupling areas; and All of the plurality of coupling regions are positioned coplanar with each other.

12. The air compressor according to claim 1, further comprising a plurality of cooling paths provided between the motor unit and the filter unit, in, The plurality of cooling paths are provided to be spaced apart from each other in a circumferential direction of the motor unit to surround at least one side of the motor unit.

13. The air compressor according to claim 12, wherein: The bus bar assembly is disposed to pass between the plurality of cooling paths spaced apart from each other. 14 . The air compressor according to claim 1 , further comprising a connector unit through which a high voltage current is applied to the filter unit and a signal detected by the filter unit is transmitted to the control board.

15. The air compressor according to claim 14, wherein The connector unit comprises: a first connector electrically connecting the control board and the current sensor assembly; and A second connector electrically connects an external power source and the capacitor assembly, and a high-voltage direct current (DC) is applied to the capacitor assembly through the second connector.

16. The air compressor according to claim 15, wherein The first connector includes an interlock wire that is electrically connected to the second connector and checks whether the capacitor assembly and the second connector are connected. 17 . The air compressor according to claim 16 , further comprising a cooling cover configured to cover at least one surface of the transistor and absorb heat of the transistor.

18. The air compressor according to claim 17, wherein The cooling cover includes a connector fixing portion to fix one side of the connector unit.

19. The air compressor according to claim 9, wherein: The housing includes a second accommodation unit, and the control board is disposed in the second accommodation unit; and The first accommodation unit and the second accommodation unit are arranged to be orthogonal to each other.

Images