KR20220141238A - Air compressor - Google Patents

Abstract

The present invention relates to an air compressor which improves the arrangement structure between a filter unit and a discharge resistor to reduce interference between the filter unit and the discharge resistor and increase the space utilization of the filter unit to reduce the size of an air compressor. The air compressor comprises: a housing; a rotary shaft arranged in the housing; a compression unit connected to the rotary shaft to compress inflow air to discharge compressed air; a motor unit driving the rotary shaft; a control circuit board controlling the motor unit; and a filter unit filtering noise of external power to supply filtered power to the control circuit board. The filter unit includes: a capacitor assembly connected to an external power source; a transistor connected to the control circuit board; a current sensor assembly connected to the transistor; and a discharge resistor connected to the capacitor assembly to discharge charges remaining in the capacitor assembly.

Description

Air compressor

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

In general, a fuel cell vehicle refers to a vehicle in which hydrogen and oxygen are supplied to a humidifier, and electric energy generated through an electrochemical reaction, which is a reverse reaction of electrolysis of water, is supplied as a driving force of the vehicle. This is disclosed.

In general, passenger fuel cell vehicles are equipped with a fuel cell stack of 80 kW class, and when the fuel cell stack is operated under pressurized conditions, the air supplied to the fuel cell stack is supplied at a high pressure of 1.2 to 3.0 bar. An air compressor having a rotation speed of 5,000 to 100,000 rpm should be used.

A fuel cell vehicle typically includes a fuel cell stack that produces electricity, a humidifier that humidifies and supplies fuel and air to the fuel cell stack, a fuel supply that supplies hydrogen to the humidifier, and air that supplies air containing oxygen to the humidifier. It is composed of a supply unit and a cooling module for cooling the fuel cell stack.

The air supply unit consists of an air cleaner that filters foreign substances contained in the air, an air compressor that compresses and supplies the air filtered by the air cleaner, and a control box that controls the air compressor.

The above-mentioned air compressor compresses air sucked in from the outside using an impeller and then sends it out to the fuel cell stack through an exhaust port. At this time, the impeller and the shaft constituting the compression unit are driven by the rotational force of the motor.

The motor of this air compressor is powered through an inverter, and its operation is controlled. The inverter includes a printed circuit board (PCB) on which electric elements such as transistors, capacitors, inductors, and the like, fixed resistors, diodes, and drivers are mounted.

However, in the conventional air compressor, space utilization between parts is poor, and as a result, assembly of parts is deteriorated, and there is a limit to miniaturization of the air compressor.

In addition, as a high voltage current is applied, an internal overheating phenomenon occurs due to the heat generated by the constant current flowing.

Republic of Korea Patent No. 0962903 (registered on June 1, 2010)

The present invention has been devised to solve the above-described problems, and it is an object of the present invention to provide an air compressor that improves space utilization between parts and facilitates heat dissipation from the inside.

The problems to be solved by the present invention are not limited to the problems mentioned above, and other problems not mentioned here will be clearly understood by those skilled in the art from the following description.

An air compressor according to an aspect of the present invention includes a housing; a rotating shaft disposed inside the housing; a compression unit connected to the rotating shaft to compress and discharge the inlet air; a motor unit for driving the rotating shaft; a control board for controlling the motor unit; and a filter unit for filtering noise of external power and supplying it to the control board. including, wherein the filter unit includes: a capacitor assembly connected to an external power source; a transistor connected to the control board; a current sensor assembly connected to the transistor; and a discharge resistor connected to the capacitor assembly to discharge charges remaining in the capacitor assembly. includes

a transmission module for transmitting the power of the control board to the motor unit; It further includes, wherein the discharge resistor is disposed adjacent to the transmission module, the transmission module includes a transmission unit extending radially outward from the motor unit; may include

The capacitor assembly may include: a capacitor; a case supporting the capacitor; and a resistor connection terminal connected to the discharge resistor. Including, the resistance connection terminal may be disposed on the capacitor.

a first cover disposed to cover at least one side of the filter unit; and heat exchange means disposed between the first cover and the transistor. may include

The current sensor assembly and the capacitor assembly may be disposed in a first direction perpendicular to an axial direction, and the transistor may be disposed in a second direction perpendicular to the first direction with respect to the current sensor assembly and the capacitor assembly.

and at least one cooling passage disposed between the motor unit and the filter unit, and the discharge resistor may be disposed adjacent to the cooling passage.

The first cover may be disposed on an upper side of the transistor, and the discharge resistor may be disposed on an upper surface of the first cover.

a fixing member coupled to the discharge resistor and disposed on the upper surface of the first cover to fix the discharge resistor to the first cover; may include.

The discharge resistor may be disposed adjacent to the current sensor assembly.

The first cover may have a width in a first direction greater than a width in a second direction, and the discharge resistor may be arranged such that a width in the first direction is longer than a width in the second direction.

One surface of the first cover to which the discharge resistor is fixed may be disposed lower than the resistor connection terminal.

The inner space of the housing is divided into a first space in which the capacitor assembly is disposed and a second space in which the current sensor assembly is disposed based on an imaginary line extending in the axial direction, and the discharge resistor is disposed in the first space. can be placed.

The discharge resistor may be disposed under the case.

a second cover disposed inside the housing; and, the second cover may include a first support part supporting the current sensor assembly and a second support part supporting the transmission unit.

The second support portion may include a protrusion surrounding a portion of the transfer unit, and the housing may further include a through hole for accommodating the protrusion.

The housing further includes a groove spaced apart from the through hole, and a sealing disposed inside the groove. When the second cover is disposed inside the housing, the upper side of the groove and the sealing are It may be covered by a second cover.

The first cover may be made of at least one of aluminum, a synthetic resin material, and steel.

The first cover and the heat exchange means may be provided integrally.

According to the embodiment, by improving the arrangement structure between the filter part and the discharge resistor, interference between the filter part and the discharge resistor is reduced, and the space utilization of the filter part is increased to make the air compressor compact.

In addition, by arranging the discharge resistor on the upper surface of the cover or in a position where heat is easily discharged, overheating of the discharge resistor is prevented and the problem that the temperature around the filter unit rises can be solved.

1 is a cross-sectional view schematically illustrating an air compressor according to an embodiment of the present invention.
2 is a plan view of a housing and a filter unit according to an embodiment of the present invention.
3 is a partial cross-sectional view of an air compressor according to an embodiment of the present invention.
4 is a plan view of a capacitor assembly according to an embodiment of the present invention.
5 is a plan view of an air compressor according to an embodiment of the present invention.
6 is a perspective view of a connector part according to an embodiment of the present invention.
7 is a perspective view of a cover according to an embodiment of the present invention.
8 is a perspective view of a capacitor assembly and a discharge resistor according to an embodiment of the present invention.
9 is a circuit configuration diagram of a capacitor assembly and a discharge resistor according to an embodiment of the present invention.
10 is a diagram comparing a height difference in a third direction between a capacitor assembly and a discharge resistor according to an embodiment of the present invention.
11 is a view comparing the height difference in the third direction of the capacitor assembly, the discharge resistor, and the cover according to an embodiment of the present invention.
12 is a view illustrating a part of a filter unit according to an embodiment of the present invention.
13 is a plan view schematically illustrating an air compressor according to another embodiment of the present invention.
14 is a plan view of an air compressor according to another embodiment of the present invention.
15 is a perspective view of a cover according to another embodiment of the present invention.
16 is a partial cross-sectional view of an air compressor according to another embodiment of the present invention.
17 is a perspective view of a second housing according to another embodiment of the present invention.
18 is a cross-sectional view illustrating a portion in which a cover is coupled to a second housing according to another embodiment of the present invention.
19 is a perspective view illustrating a state in which a discharge resistor is coupled to a capacitor assembly according to another embodiment of the present invention.
20 is a front view illustrating a state in which a discharge resistor is coupled to a capacitor assembly according to another embodiment of the present invention.

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 described, but may be implemented in various different forms, and within the scope of the technical spirit of the present invention, one or more of the components may be selected between the embodiments. It can be combined and substituted for use.

In addition, terms (including technical and scientific terms) used in the embodiments of the present invention may be generally understood by those of ordinary skill in the art to which the present invention pertains, unless specifically defined and described explicitly. It may be interpreted as a meaning, and generally used terms such as terms defined in advance may be interpreted in consideration of the contextual meaning of the related art.

In addition, the terms used in the embodiments of the present invention are for describing the embodiments and are not intended to limit the present invention.

In this specification, the singular form may also include the plural form unless otherwise specified in the phrase, and when it is described as "at least one (or one or more) of A and (and) B, C", it is combined with A, B, C It may include one or more of all possible combinations.

In addition, in describing the components of the embodiment of the present invention, terms such as first, second, A, B, (a), (b), etc. may be used.

These terms are only for distinguishing the component from other components, and are not limited to the essence, order, or order of the component by the term.

And, when it is described that a component is 'connected', 'coupled' or 'connected' to another component, the component is not only directly connected, coupled or connected to the other component, but also with the component It may also include the case of 'connected', 'coupled' or 'connected' due to another element between the other elements.

In addition, when it is described as being formed or disposed on "above (above) or under (below)" of each component, the top (above) or bottom (below) is one as well as when two components are in direct contact with each other. Also includes a case in which another component as described above is formed or disposed between two components. In addition, when expressed as "upper (upper) or lower (lower)", the meaning of not only an upper direction but also a lower direction based on one component may be included.

1 is a cross-sectional view schematically illustrating 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 400 , a filter unit 500 , and a delivery module 600 .

The housing 100 may form an exterior. The housing 100 may include a first housing 110 and a second housing 120 . The first housing 110 may have a rotation shaft 101 , a compression unit 200 , and a motor unit 300 disposed therein. In addition, the second housing 120 may be provided with a receiving part in which the filter part 500 is disposed. The first housing 110 and the second housing 120 may be integrally formed, but is not limited thereto.

The compression part 200 is disposed in front of the inside of the housing 100 . Here, the front refers to a direction toward the compression unit 200 with respect to the motor unit 300 , and the rear refers to a direction opposite to the front.

The motor unit 300 rotates and drives the rotation shaft 101 to provide a 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 driving coil, and the driving coil generates electromagnetic force when power is supplied from the outside. Accordingly, the rotor 310 may rotate by 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 . Here, it is preferable that the driving coil operates by receiving three-phase AC power.

The control board 400 is equipped with circuits and elements for controlling the motor unit 300 . In this case, the control board 400 may be a printed circuit board (PCB) board. The control board 400 may be disposed on 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 . In this case, the control board 400 may be formed in the shape of a substrate and disposed so that a thickness direction of the rotation shaft 101 faces an axial direction.

The filter unit 500 receives external power and supplies it to the control board 400 , but in a state in which noise of the power is removed. In this case, the filter unit 500 may be disposed radially outside the motor unit 300 .

The transmission module 600 transmits the power of the control board 400 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 transmission module 600 . The transmission module 600 may transmit the three-phase AC voltage converted by the filter unit 500 to the motor unit 300 . The transmission module 600 may include a busbar or a wire, and may include any means capable of transmitting power to the motor unit 300 .

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 cross-sectional view of an air compressor according to an embodiment of the present invention.

2 and 3 , the filter unit 500 may include a transistor 510 , a capacitor assembly 520 , and a current sensor assembly 530 .

The transistor 510 converts a DC voltage into a driving voltage of the motor unit 300 through switching driving. The transistor 510 is disposed on the rear side of the second housing 120 and is connected to the control board 400 . In this case, the transistor 510 may be an insulated gate bipolar transistor (IGBT).

The transistor 510 includes six IGBTs, a first phase U high-side switching element, a first phase U low-side switching element, and a second phase (Phase V) upper side ( High) switching element, second phase (Phase V) lower side (Low) switching element, third phase (Phase W) upper side (High) switching element, third phase (Phase W) low side (Low) switching element have. The transistor 510 is connected to the capacitor assembly 520 and the current sensor assembly 530 .

The capacitor assembly 520 is electrically connected to an external power source to receive and store a high voltage DC current. In addition, the capacitor assembly 520 is electrically connected to the transistor 510 and the transfer module 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 transfer module 600 .

The transistor 510 , the capacitor assembly 520 , and the current sensor assembly 530 may be mounted in the second housing 120 . In this case, the capacitor assembly 520 and the current sensor assembly 530 may be disposed in a first direction (X-axis direction). In addition, 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, and the second direction (Y-axis direction) may be parallel to the axial direction.

The transmission module 600 connects the motor unit 300 and the filter unit 500 . The transmission module 600 transmits the power of the control board 400 to the motor unit 300 . In this case, the transmission module 600 may be electrically connected to the capacitor assembly 520 and the current sensor assembly 530 . The transfer module 600 may include a transfer unit, at least one of the transfer units may be connected to the capacitor assembly 520 , and at least one other of the transfer units may be connected to the current sensor assembly 530 .

The transfer module 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 transmission module 600 may pass through the second housing 120 and be connected to the motor unit 300 .

A through hole 120H in which the delivery module 600 is disposed may be formed in the second housing 120 . One end of the transmission module 600 may be connected to the motor unit 300 with respect to the through hole 120H, and the other end may be connected to the filter unit 500 .

The air compressor having this structure minimizes the thickness of the housing between the motor unit 300 and the filter unit 500 , and makes the components of the filter unit 500 compact in the second housing 120 . By disposing, the size of the air compressor can be reduced.

The delivery module 600 may include a delivery unit 610 and a fixing means 620 .

The transfer unit 610 is electrically connected to the motor unit 300 . At this time, the transfer unit 610 supplies the AC voltage converted by the transistor 510 to the motor unit 300 . The transfer unit 610 may be plural. The transfer unit 610 of this embodiment may be configured as a busbar. As a result, the transfer unit 610 includes a U-phase bus bar 611 that delivers AC power of a first phase (Phase U) and a V-phase bus bar that delivers AC power of a second phase (Phase V) ( 612 , and a W-phase bus bar 613 that transmits AC power of the third phase (Phase W) may be included.

The transfer unit 610 may extend radially outward from the motor unit 300 . In addition, the transfer unit 610 may pass through the through hole 120H and be bent toward the filter unit 500 . At this time, the U-phase bus bar 611 may be bent toward the capacitor assembly 520 side, and the V-phase and W phase bus bars 612 and 613 may be bent toward the current sensor assembly 530 side. .

Ends of the U-phase, V-phase, and W-phase bus bars 611 , 612 , and 613 may be exposed from the fixing means 620 while being spaced apart from each other. In this case, at least one end of the transfer unit 610 may be connected to the capacitor assembly 520 , and the rest of the transfer unit 610 may be connected to the current sensor assembly 530 .

According to the embodiment, the end of the transfer unit 610 is bidirectionally arranged so that an assembly space can be secured between the transfer unit 610 and the capacitor assembly 520 and the current sensor assembly 530 . And it is possible to increase the convenience of assembly.

The fixing means 620 fixes the transfer unit 610 to the housing 100 in an insulated state. To this end, the fixing means 620 may include a grommet 621 and a guide member 622 .

The grommet 621 is disposed in the through hole 120H, and fixes the transmission unit 610 passing through the through hole 120H. In this case, the grommet 621 may have elasticity and may be made of an insulating material. Preferably, the grommet 621 may be a rubber material.

The guide member 622 may guide each end of the transfer unit 610 to the capacitor assembly 520 or the current sensor assembly 530 . The guide member 622 may be made of an insulating material. Preferably, the guide member 622 may be a plastic material.

According to an embodiment, the air compressor according to the present invention includes a plurality of cooling passages 700 for cooling the motor unit 300 . The plurality of cooling passages 700 may extend in parallel with the axial direction of the rotation shaft ( 101 of FIG. 1 ). The plurality of cooling passages 700 may be embedded in the housing 100 and disposed between the motor unit 300 and the filter unit 500 .

The plurality of cooling passages 700 may 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 . In this case, the plurality of cooling passages 700 may be disposed between the filter unit 500 and the motor unit 300 to absorb heat generated in the filter unit 500 .

The delivery module 600 may be disposed to pass between the plurality of cooling passages 700 spaced apart from each other. At this time, the plurality of cooling passages 700 may also absorb heat generated in the transfer unit 610 , thereby preventing overheating of the transfer unit 610 .

4 is a plan view of a capacitor assembly according to an embodiment of the present invention.

Referring to FIG. 4 , the capacitor assembly 520 may include a capacitor 521 , a case 522 , a terminal part 523 , and a resistor connection terminal 524 .

The capacitor 521 may be a multilayer ceramic capacitor or a film capacitor.

The case 522 may support the capacitor 521 . The case 522 may be fixed to the receiving part of the second housing ( 120 in FIG. 2 ).

The terminal part 523 may be disposed on the case 522 . In this case, the terminal part 523 may be integrally formed with the case 522 by insert injection.

The terminal unit 523 may include a power output bus bar 523C. The power output bus bar 523C is electrically connected to the transmission module 600 . The power output bus bar 523C may be integrally formed with the case 522 to secure insulation, reduce the number of parts, and increase assembly.

In addition, the terminal unit 523 includes input terminals 523P1 and 523N1 connected to a connector unit 800 to be described later, output terminals 523P2 and 523N2 connected to the transistor 510 and a ground to the housing 100 . ) may include a ground terminal 523G to which it is connected.

The resistor connection terminal 524 may be electrically connected to the discharge resistor 1000 . The resistance connection terminal 524 may be connected to a terminal of the connection member 1200 to be described later. In addition, the resistor connection terminal 524 may be disposed on the capacitor 521 .

Although not shown in the drawing, the resistor connection terminal 524 may be disposed on the case 522 . Alternatively, the capacitor assembly 520 and the discharge resistor 1000 may be connected by a method of connecting the terminal part 523 and the terminal of the connection member 1200 , and the resistor connection terminal 524 may be omitted. .

5 is a plan view of an air compressor according to an embodiment of the present invention, FIG. 6 is a perspective view of a connector part according to an embodiment of the present invention, and FIG. 7 is a perspective view of a cover according to an embodiment of the present invention.

5 and 6 , the air compressor according to the present invention includes a connector part 800 , a first cover 900 , a discharge resistor 1000 , a first fixing member 1100 , and a connection member 1200 . can do.

The connector unit 800 may apply an external power to the filter unit 500 and transmit a signal detected by the filter unit 500 to the control board 400 . The connector part 800 may include a first connector 810 and a second connector 820 .

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 so that it can be checked 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 .

The first terminal 811 is connected to the current sensor assembly 530 , and the second terminal 812 is spaced apart from the first terminal 811 to be connected to the control board 400 . In this case, the first wire 813 may be provided in six pieces to be electrically connected to the first terminal 811 and the second terminal 812 .

At this time, the plurality of first wires 813 may be bundled by a band (B). In addition, the plurality of first wires 813 may be disposed to pass through the upper side of the transistor 510 . In this case, a fixing clip 830 is installed on the upper side of the transistor 510 to fix the movement of the plurality of first wires 813 .

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 later. The interlock wire 814 detects whether the second connector 820 is connected to an external power source.

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

The shield member 821 may be mounted on one side of the housing 100 . In this case, the shield member 821 may be made of an insulating material. The shield member 821 may be coupled to the second cable 822 to fix the second cable 822 to the housing 100 .

The second cable 822 may extend from the shield member 821 toward the capacitor assembly 520 . In this case, two second cables 822 may be provided.

High voltage electrodes 823N1 and 823P1 may be provided at ends of the two second cables 822 , respectively. In this case, the high voltage electrodes 823N1 and 823P1 may be connected to the input terminals 523P1 and 523N1 of the capacitor assembly 520 .

The interlock pin (not shown) may be embedded in the shield member 821 . In this case, the interlock pin (not shown) may be connected to the interlock cable.

The first cover 900 may be a cover for cooling the filter unit 500 . The first cover 900 may cover one side of the filter unit 500 to absorb heat generated in the filter unit 500 . Accordingly, the first cover 900 may be made of a material having excellent thermal conductivity. According to an embodiment, the first cover 900 may be formed of at least one of aluminum, a synthetic resin material, and steel.

The first cover 900 may be disposed above the filter unit 500 . In addition, the first cover 900 may cover at least one side of the filter unit 500 to absorb heat generated in the filter unit 500 . According to an embodiment, the first cover 900 may be fixedly installed to the second housing while covering at least an upper side of the transistor 510 . However, the present invention is not limited thereto, and the position of the first cover 900 may be disposed anywhere in the filter unit 500 .

The discharge resistor 1000 may be connected to the capacitor assembly 520 . The discharge resistor 1000 may discharge charges remaining in the capacitor assembly 520 when the capacitor assembly 520 is separated from the connector part 800 . That is, when the supply of power from the external power source is stopped, the discharge resistor 1000 may discharge residual charges of the capacitor assembly 520 to prevent an electric shock accident.

The discharge resistor 1000 may be separate from the capacitor assembly 520 . In addition, the discharge resistor 1000 may be spaced apart from the capacitor assembly 520 in the second direction (Y-axis direction).

The discharge resistor 1000 may be disposed on the first cover 900 . In this case, the discharge resistor 1000 may be overheated during operation for a long time because a high-voltage current constantly flows. The first cover 900 may absorb heat of the discharge resistor 1000 to prevent overheating.

The first fixing member 1100 may fix the discharge resistor 1000 to the first cover 900 . The first fixing member 1100 may be coupled to the discharge resistor 1000 and disposed on the upper surface of the first cover 900 .

The first fixing member 1100 may include a first fastening part 1110 and a first fixing part 1120 . The first coupling part 1110 may be in contact with the first cover 900 and be coupled to the resistance fixing part 940 extending from the upper surface of the first cover 900 . In addition, the first fixing part 1120 may extend from the first fastening part 1110 to clamp the discharge resistor 1000 . The first fastening part 1110 and the first fixing part 1120 are integrally formed, and may be a member having elasticity.

Referring to FIG. 7 , the first cover 900 may include a body 910 , a fixing part 920 , a connector fixing part 930 , and a resistance fixing part 940 .

The body 910 may be disposed above 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 by the transistor 510 to prevent overheating of the transistor 510 .

The fixing part 920 is plural, and each fixing part 920 may extend from the edge of the body 910 . The plurality of fixing parts 920 may be formed integrally with the body 910 and made of the same material as the body 910 . At this time, the plurality of fixing parts 920 may be coupled to the first housing ( 120 in FIG. 2 ) by fastening bolts.

The connector part fixing part 930 may be disposed on the upper surface 911 of the body 910 . In addition, the connector part fixing part 930 may fix the connector part 800 passing over the upper side of the first cover 900 . The connector fixing part 930 may protrude upward from the upper surface of the body 910 , and a fixing hole 931 for inserting the fixing clip 830 may be formed. At this time, the end of the fixing clip 830 may be inserted into the fixing hole 931 to be fixed in motion.

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

The plurality of resistance fixing units 940 may be provided, and the plurality of resistance fixing units 420 may be spaced apart from each other in a first direction (X-axis direction). In this case, the discharge resistor 1000 may be disposed between the plurality of resistor fixing units 940 spaced apart from each other. In this case, the separation distance D in the first direction (X-axis direction) between the plurality of resistor fixing parts 940 may be greater than the width of the discharge resistor 1000 .

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

8 is a perspective view of a capacitor assembly and a discharge resistor according to an embodiment of the present invention, FIG. 9 is a circuit configuration diagram of a capacitor assembly and a discharge resistor according to an embodiment of the present invention, and FIG. 10 is an embodiment of the present invention It is a view comparing the height difference in the third direction between the capacitor assembly and the discharge resistor according to the example, and FIG. 11 is a view comparing the height difference in the third direction between the capacitor assembly, the discharge resistor, and the cover according to an embodiment of the present invention.

8 to 11 , the air compressor according to the present invention may further include a connection member 1200 for electrically connecting the discharge resistor 1000 and the capacitor assembly 520 . In addition, the discharge resistor 1000 may be spaced apart from the capacitor assembly 520 . In this case, by separating the discharge resistor 1000 and the capacitor assembly 520 , the degree of design freedom can be increased and the space can be more compactly utilized.

8 and 9 , the third direction (Z-axis direction) height of the position where the discharge resistor 1000 is disposed may be lower than the third direction (Z-axis direction) height of the upper surface of the capacitor assembly 520 . have. Here, the height means a distance spaced apart from the lower surface of the capacitor assembly 520 in the third direction (Z direction).

The height H1 of the lower surface of the discharge resistor 1000 may be lower than the height H2 of the resistor connection terminal 524 . In addition, the height H1 of the lower surface of the discharge resistor 1000 may be lower than the height of the upper surface of the capacitor assembly 520 and higher than the height H3 of the lower surface of the capacitor assembly 520 .

Similarly, the height H4 of the lower end of the first cover 900 may be lower than the height H2 of the resistance connection terminal 524 . In addition, the height H4 of the lower end of the first cover 900 may be lower than the height of the upper surface of the capacitor assembly 520 and higher than the height H3 of the lower surface of the capacitor assembly 520 . A transistor 510 may be disposed under the first cover 900 .

As described above, in the air compressor according to the present invention, the discharge resistor is disposed lower than that of the capacitor assembly, so that a protruding portion is eliminated, interference between components can be reduced, and space utilization around the filter unit can be improved.

12 is a view illustrating a part of a filter unit according to an embodiment of the present invention.

Referring to FIG. 12 , the air compressor may further include a heat exchange means 1300 disposed between the first cover 900 and the transistor 510 to increase cooling efficiency.

The heat exchange means 1300 may be heat-exchangeably connected to the transistor 510 to be heated by heat generated by the transistor 510 or cooled together with the transistor 510 .

The heat exchange means 1300 may be in direct contact to exchange heat through conduction, but is not limited thereto. In addition, the first cover 900 may be disposed on the upper side of the heat exchange means 1300 . In addition, the discharge resistor 1000 may be disposed on the upper side of the first cover 900 .

As such, by further providing a heat exchange means 1300 between the first cover 900 and the transistor 510 , the transistor 510 can be more effectively cooled, and the first cover 900 is disposed above the transistor 510 . The cooling efficiency of the discharge resistor 1000 may also be increased.

Referring back to FIG. 12 , the heat exchange means 1300 may be provided integrally with the first cover 900 .

Since the first cover 900 is disposed on the upper side of the heat exchange means 1300, the first cover 900 and the heat exchange means 1300 are provided integrally with the first cover 900 is shaken even by vibration caused by an external force. This can be reduced. The first cover 900 and the heat exchange means 1300 may be integrally formed through an adhesive member such as an adhesive, or may be integrally formed through injection.

Hereinafter, an air compressor according to another embodiment will be described with reference to FIG. 13 .

13 is a plan view schematically illustrating an air compressor according to another embodiment of the present invention.

This embodiment is substantially the same as the air compressor shown in FIG. 5 except for the position of the discharge resistor. Accordingly, the same components as in FIG. 5 are given the same reference numerals, and repeated descriptions will be omitted.

Referring to FIG. 13 , the air compressor according to the present invention may include a discharge resistor 2000 electrically connected to the capacitor assembly 520 .

The discharge resistor 2000 is a rectangular member and may be disposed in a first direction (Y-axis direction). That is, the width WR1 in the first direction (X-axis direction) of the discharge resistor 2000 may be smaller than the width WR2 in the second direction (Y-axis direction). The discharge resistor 2000 disposed in this way can reduce interference with the filter unit, and is disposed parallel to the flow direction of the cooling flow path (700 in FIG. 3 ) to facilitate heat dissipation.

The inner space of the second housing 120 may be divided into a first space 120A and a second space 120B based on an arbitrary virtual line C extending in the second direction. At this time, the virtual line (C) may pass through the delivery module (600). A capacitor assembly 520 may be disposed in the first space 120A, and a current sensor assembly 530 may be disposed in the second space 120B. In this case, the discharge resistor 2000 may be disposed in the first space 120A.

In one embodiment, although not shown in the drawing, the discharge resistor 1000 may be disposed adjacent to the current sensor assembly 530 . The discharge resistor 1000 may be coupled to the current sensor assembly 530 .

In one embodiment, although not shown in the drawing, the discharge resistor 1000 may be disposed adjacent to the transfer module 600 . The discharge resistor 1000 may be coupled to the fixing means ( 620 in FIG. 3 ).

In one embodiment, although not shown in the drawing, the discharge resistor 1000 may be coupled to the second housing 120 . In this case, the second housing 120 may have a receiving unit in which the filter unit 500 is disposed, and the discharge resistor 1000 may be mounted in the receiving unit. In this case, the air compressor may further include a second fixing member for fixing the discharge resistor 1000 to the upper surface of the second housing 120 .

The air compressor according to the present invention as described above reduces the interference between the filter unit 500 and the discharge resistor 1000 by improving the arrangement structure between the filter unit 500 and the discharge resistor 1000, and The air compressor can be made compact by increasing space utilization.

In addition, by arranging the discharge resistor 1000 on the upper surface of the first cover 900 or at a position where heat is easily discharged, overheating of the discharge resistor 1000 is prevented and the temperature around the filter unit 500 is increased. can

Hereinafter, an air compressor according to another embodiment will be described with reference to FIGS. 14 to 20 .

14 is a plan view of an air compressor according to another embodiment of the present invention, FIG. 15 is a perspective view of a cover according to another embodiment of the present invention, and FIG. 16 is a view of an air compressor according to another embodiment of the present invention A partial cross-sectional view, FIG. 17 is a perspective view of a second housing according to another embodiment of the present invention, and FIG. 18 is a cross-sectional view showing a portion in which a cover according to another embodiment of the present invention is coupled to the second housing, 19 is a perspective view illustrating a state in which a discharge resistor is coupled to a capacitor assembly according to another embodiment of the present invention, and FIG. 20 is a state in which a discharge resistor is coupled to a capacitor assembly according to another embodiment of the present invention. It is a front view.

The air compressor of this embodiment shown in Figs. 14 to 20 is substantially the same as the air compressor shown in Fig. 5 . Accordingly, the same components as in FIG. 5 are given the same reference numerals, and repeated descriptions will be omitted.

14 to 18 , the air compressor according to another embodiment of the present invention may include a second cover 3000 .

The second cover 3000 may be disposed inside the second housing 120 . The second cover 3000 may be disposed on one side of the capacitor assembly 520 in the first direction (X-axis direction) inside the second housing 120 . Also, the second cover 3000 may be disposed on one side of the first cover 900 in the second direction (Y-axis direction) inside the second housing 120 . That is, the second cover 3000 may cover the inside of the second housing 120 that is not covered by the capacitor assembly 520 and the first cover 900 .

The second cover 3000 may include a first support part 3100 and a second support part 3200 .

The first support part 3100 may be disposed on one side of the second cover 3000 in the first direction (X-axis direction). The first support part 3100 may support the current sensor assembly 530 . The first support part 3100 may have a shape corresponding to the shape of the current sensor assembly 530 in order to support the current sensor assembly 530 , but is not limited thereto.

The second support part 3200 may support the delivery unit 610 . In more detail, the second support unit 3200 includes a U-phase bus bar 611 that delivers AC power of a first phase (Phase U) and a V-phase bus bar that delivers AC power of a second phase (Phase V). A W-phase bus bar 613 that transmits AC power of the 612 and the third phase (Phase W) may be supported, respectively. In this case, each of the bus bars 611 , 612 , and 613 may have a shape bent toward the current sensor assembly 530 as shown in FIG. 15 . Since each of the bus bars 611 , 612 , and 613 is bent in the same direction, the convenience of assembly is improved and the assembly time can be shortened.

The second support part 3200 may include a protrusion 3210 protruding in the third direction (Z-axis direction) along the shape of the delivery unit 610 . A portion of the delivery unit 610 may protrude to the outside of the second cover 3000 in a third direction (Z-axis direction) in a state supported by the second cover 3000 . The protrusion 3210 may surround a portion of the delivery unit 610 that protrudes outwardly of the second cover 3000 .

The protrusion 3210 may be accommodated in the through hole 120H of the second housing 120 illustrated in FIGS. 17 and 18 . The protrusion 3210 may have a thickness corresponding to a distance between one surface and one surface of the second housing 120 forming the through hole 120H. Thereby, the gap between the outer surface of the protrusion 3210 and the one surface of the second housing 120 forming the through hole 120H is suppressed, so that the transmission unit 610 is stably maintained in a state supported by the protrusion 3210. can

In addition, in the air compressor according to the present invention, since the second cover 3000 supports the U-phase, V-phase, and W-phase bus bars 611.612 and 613, the U-phase, V-phase and W-phase bus bars 611. 612, 613), the amount of fastening members used to support the bolts and the like is reduced, so that the cost and assembly time required for manufacturing the air compressor can be saved.

In addition, since the air compressor according to the present invention covers an area that the capacitor assembly 520 and the first cover 900 cannot cover in the second housing 120 by the second cover 3000, the It is possible to prevent a fastening member or the like from entering the inside of the second housing 120 .

In addition, in the air compressor according to the present invention, since the second cover 3000 supports the current sensor assembly 530 and the transmission unit 610 at the same time, the process of double injection of the cover for supporting each configuration can be omitted. have. Thereby, cost reduction, assembly cost, and consumption of assembly time can be saved.

Referring back to FIGS. 16 to 18 , the air compressor according to another embodiment of the present invention has a groove 4000 disposed inside the second housing 120 and a sealing ring disposed in the groove 4000 . (5000) may be included.

The groove 4000 may be disposed near the through hole 120H disposed inside the second housing 120 . The groove 4000 may be spaced apart from the through hole 120H. The groove 4000 may be formed in a rectangular ring shape along one surface of the second housing 120 forming the through hole 120H, but is not limited thereto. The groove 4000 may be formed along a third direction (Z-axis direction) on one surface of the second housing 120 . When the second cover 3000 is disposed inside the second housing 120 , the opened upper side of the groove 4000 may be covered by the second cover 3000 .

The sealing 5000 may be disposed in the groove 4000 . The sealing 5000 may be formed to have a circular cross-section. The sealing 5000 may be partially pressed by the second cover 3000 . When the second cover 3000 is disposed on the second housing 120 to cover the upper side of the groove 4000 , the sealing 5000 is airtight between the engagement surface of the second cover 3000 and the engagement surface of the groove 4000 . can be maintained. Accordingly, the inflow of foreign substances into the interior of the second housing 120 may be prevented.

Also, the sealing 5000 may prevent hot air generated from the air compressor from flowing into an inverter (not shown) that supplies power to the motor unit 300 . Accordingly, the performance of the inverter (not shown) may be maintained, and power may be stably supplied to the motor unit 300 through the inverter (not shown).

In this embodiment, although the shape of the sealing 5000 is illustrated as a circle, it is not limited thereto, and the shape of the sealing 5000 may be provided in a polygonal shape such as a square shape or a pentagonal shape.

14 and 19 to 20 , the discharge resistor 1000 and the first fixing member 1100 according to another embodiment of the present invention may be disposed below the case 522 of the capacitor assembly 520 . can

In more detail, the discharge resistor 1000 is coupled to the first fixing member 1100 , and may be fixed to the lower side of the case 522 by the first fixing member 1100 . In this case, the discharge resistor 1000 may be disposed on the lower side of the case 522 in the second direction (Y direction). The discharge resistor 1000 through which a high-pressure current flows may be cooled by cooling water flowing inside the second housing 120 .

The discharge resistor 1000 and the first fixing member 1100 according to the present embodiment may be integrally provided in the case 522 of the capacitor assembly 520 .

As the discharge resistor 1000 is disposed on the lower side of the case 522 , the connection member 1200 for electrically connecting the discharge resistor 1000 and the capacitor assembly 520 can be wound along the outer surface of the case 520 . have.

Although the above has been described with reference to preferred embodiments of the present invention, those skilled in the art can variously modify and change the present invention within the scope without departing from the spirit and scope of the present invention as set forth in the claims below. You will understand that it can be done.

100: housing
200: compression unit
300: motor unit
400: control panel
500: filter unit
600: transmission module
620: fixing means
700: cooling flow path
800: connector part
900: first cover
1000,2000: discharge resistance
1100: first fixing member
1200: connecting member

Claims (18)

housing;
a rotating shaft disposed inside the housing;
a compression unit connected to the rotating shaft to compress and discharge the inlet air;
a motor unit for driving the rotating shaft;
a control board for controlling the motor unit; and
a filter unit for filtering noise of external power and supplying it to the control board; including,
The filter unit,
a capacitor assembly connected to an external power source;
a transistor connected to the control board;
a current sensor assembly connected to the transistor; and
a discharge resistor connected to the capacitor assembly to discharge charges remaining in the capacitor assembly; An air compressor comprising a. According to claim 1,
a transmission module for transmitting the power of the control board to the motor unit; further comprising,
The discharge resistor is disposed adjacent to the delivery module,
The transmission module may include: a transmission unit extending radially outward from the motor unit; An air compressor comprising a. 3. The method of claim 2,
The capacitor assembly is
capacitor;
a case supporting the capacitor; and
a resistor connecting terminal connected to the discharge resistor; includes,
and the resistance connection terminal is disposed on the capacitor. 4. The method of claim 3,
a first cover disposed to cover at least one side of the filter unit; and
a heat exchange means disposed between the first cover and the transistor; An air compressor comprising a. 4. The method of claim 3,
The current sensor assembly and the capacitor assembly are disposed in a first direction perpendicular to the axial direction,
The transistor is disposed in a second direction perpendicular to the first direction with respect to the current sensor assembly and the capacitor assembly. 6. The method of claim 5,
and at least one cooling passage disposed between the motor unit and the filter unit,
The discharge resistor is disposed adjacent to the cooling passage. 5. The method of claim 4,
The first cover is disposed on the upper side of the transistor,
The discharge resistor is an air compressor disposed on an upper surface of the first cover. 8. The method of claim 7,
a fixing member coupled to the discharge resistor and disposed on the upper surface of the first cover to fix the discharge resistor to the first cover; An air compressor comprising a. 8. The method of claim 7,
wherein the discharge resistor is disposed adjacent to the current sensor assembly. 5. The method of claim 4,
The first cover is disposed such that the width in the first direction is longer than the width in the second direction,
The discharge resistor is disposed such that the width in the first direction is longer than the width in the second direction. 11. The method of claim 10,
One surface of the first cover to which the discharge resistor is fixed is disposed lower than the resistor connection terminal. 6. The method of claim 5,
The inner space of the housing is divided into a first space in which the capacitor assembly is disposed and a second space in which the current sensor assembly is disposed based on an imaginary line extending in the axial direction,
The discharge resistor is an air compressor disposed in the first space. 13. The method of claim 12,
The discharge resistor is an air compressor disposed on the lower side of the case. 4. The method of claim 3,
a second cover disposed inside the housing; including,
The second cover,
a first support part for supporting the current sensor assembly; and
An air compressor including a second support for supporting the delivery unit. 15. The method of claim 14,
The second support portion includes a protrusion surrounding a portion of the delivery unit,
The housing further includes a through hole for accommodating the protrusion. 16. The method of claim 15,
The housing further includes a groove spaced apart from the through hole,
a sealing disposed inside the groove;
When the second cover is disposed inside the housing, the upper side of the groove and the sealing are covered by the second cover. 5. The method of claim 4,
The first cover is an air compressor made of at least one of aluminum, a synthetic resin material, and steel. 5. The method of claim 4,
The first cover and the heat exchange means are provided integrally with the air compressor.

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