Electric compressor

Abstract

One embodiment of the present invention provides an electric compressor comprising: a housing; a compression unit for compressing refrigerant; a motor unit provided in the housing and configured to drive the compression unit; and an inverter unit disposed on one side of the housing and configured to control the motor unit. The inverter unit includes: a printed circuit board which is arranged in an open side portion of the housing; and an inverter cover coupled to the housing so as to cover the printed circuit board. The inverter cover includes a first rib portion and a second rib portion which are recessed at different depths relative to the inner surface of the inverter cover and protrude from the outer surface of the inverter cover.

Description

electric compressor

[0001] The present invention relates to an electric compressor, and more particularly, to an electric compressor in which an inverter cover can be manufactured by a stamping method, thereby reducing costs, while the rigidity of the inverter cover can be increased and NVH can be improved by a rib portion.

[0002] Automobiles are typically equipped with an air conditioning system to cool and heat the interior. This system includes a compressor that compresses low-temperature, low-pressure gaseous refrigerant drawn from the evaporator into high-temperature, high-pressure gaseous refrigerant and sends it to the condenser.

[0003] Compressors used in these automobiles include mechanical compressors that are driven by the driving force of the engine and electric compressors that use motors driven by electricity. Recently, as electrification in automobiles has accelerated, the use of electric compressors has been increasing.

[0004] Meanwhile, compressors can be divided into reciprocating compressors, which compress the refrigerant through the reciprocating motion of a piston, and rotary compressors, which compress the refrigerant through a rotary motion. Reciprocating compressors include crank compressors, which use a crank to transmit the refrigerant to multiple pistons, and swash plate compressors, which transmit the refrigerant through a rotating shaft equipped with a swash plate. Rotary compressors include vane rotary compressors, which use a rotating rotary shaft and vanes, and scroll compressors, which use an orbiting scroll and a fixed scroll.

[0005] Additionally, active development is underway in electric compressors featuring inverter-type compressors capable of variable motor speed. An example of a conventional inverter-type electric compressor is disclosed in Republic of Korea Patent Publication No. 2015-0081782.

[0006] Referring to the attached drawing 1, a conventional electric compressor is provided with a compressor housing (1) and an inverter housing (20), and a compression unit that compresses refrigerant and an electric motor that transmits power to the compression unit are built into the compressor housing (1).

[0007] The above inverter housing (20) is coupled to the compressor housing (1), and an inverter (4) that controls the operation of an electric motor is built into the inverter housing (20). The inverter (4) includes a printed circuit board (4b) installed in the inverter housing (20) and an electronic component (4a) mounted on the printed circuit board (4b). The inverter (4) in the inverter housing (20) is electrically connected to the electric motor in the compressor housing (1) by a connector.

[0008] The above inverter housing (20) has an open form on one side, and an inverter cover (3) is fastened to the inverter housing (20). The inverter cover (3) is configured to seal the opening (23) of the inverter housing (20), and functions to physically protect the inverter (4) and prevent moisture and foreign substances from entering the interior of the inverter housing (20).

[0009] The above inverter cover (3) is detachably fastened to the inverter housing (20) and can be separated from the inverter housing (20) when repairing or replacing parts of the inverter (4).

[0010] The above inverter cover (3) is generally fastened to the inverter housing (20) by a plurality of fastening bolts (51). The plurality of fastening bolts (51) pass through fastening holes (3a) formed in the inverter cover (3) and are fastened to screw holes formed in the inverter housing (20), so that the inverter cover (3) is fixed to the inverter housing (20).

[0011] According to this conventional structure, vibration generated during the operation of the electric compressor is transmitted to the inverter cover (3) through the space, thereby generating vibration due to shaking. This vibration generates radiated noise in the inverter cover (3), causing a phenomenon in which noise of a specific frequency band is converted, and thus a countermeasure for this has become necessary.

[0012]

[0013] As an example of a conventional electric compressor to solve this problem, an electric compressor that can simultaneously achieve increased rigidity of the inverter cover, reduced vibration and noise, and suppressed weight increase is disclosed in Korean Patent Publication No. 2023-0057143.

[0014] Here, the inverter cover (100) includes a plate-shaped plate (110) and an annular side plate (120) that protrudes from the outer periphery of the plate (110) toward the front housing (not shown) and extends along the outer periphery of the plate (110).

[0015] At this time, the plate (110) is formed to be curved so as to increase the rigidity of the plate (110). Specifically, the plate (110) includes a first plate portion (112) and a second plate portion (114) that extends from the first plate portion (112) and protrudes more than the first plate portion (112) on the inner side where the inverter (not shown) is built in, and is formed to be recessed more than the first plate portion (112) on the outer side.

[0016] Meanwhile, the plate (110) further includes a rib portion (R) protruding from at least one of the first inner surface (112a) and the first outer surface (112b) of the first plate portion (112) so as to further increase the rigidity of the plate (110). Specifically, the rib portion (R) may include a first rib portion (R1) protruding from the first inner surface (112a), a second rib portion (R2) protruding from the first outer surface (112b), and a fastening rib portion (R3) surrounding a fastening hole (122) to be described later.

[0017] However, since the shape of the rib portion (R) is complex in the past and, unlike the second plate portion (114), the rib portion (R) is formed to protrude from the first inner surface (112a) and the first outer surface (112b), the inverter cover (100) must be manufactured through additional machining after die casting. This has the problem that the cost increases due to the expensive die casting cost and additional machining.

[0018] The purpose of the present invention is to provide an electric compressor in which the inverter cover can be manufactured by a stamping method, thereby reducing the cost, while the rigidity of the inverter cover can be increased and NVH can be improved by a rib portion.

[0019] The technical problems to be solved by the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned can be clearly understood by a person having ordinary skill in the technical field to which the present invention belongs from the description below.

[0020] In order to solve the above problem, one embodiment of the present invention provides an electric compressor including a housing, a compression unit for compressing a refrigerant, a motor unit provided in the housing and driving the compression unit, and an inverter unit disposed on one side of the housing and controlling the motor unit, wherein the inverter unit includes a printed circuit board disposed in an open side of the housing, and an inverter cover coupled to the housing to cover the printed circuit board, wherein the inverter cover is provided with a first rib portion and a second rib portion formed to be engraved on an inner surface of the inverter cover and to protrude on an outer surface of the inverter cover at different depths.

[0021] According to an embodiment, the first rib portion may be formed to be engraved on the inner surface of the inverter cover with a first depth in an area facing the printed circuit board and to be protruded on the outer surface of the inverter cover.

[0022] According to an embodiment, the second rib portion may be formed to be at least partially disposed within an area of ​​the first rib portion, and to be engraved with respect to an inner surface of the inverter cover and protruded with respect to an outer surface of the inverter cover with a second depth greater than the first depth.

[0023] According to an embodiment, the second rib portion may include a second-first rib disposed within an area of ​​the first rib portion and including one or more bends.

[0024] According to an embodiment, the second rib portion may further include a second-second rib that is spaced apart from the second-first rib within the area of ​​the first rib portion and has at least a portion of an edge having a constant curvature.

[0025] According to an embodiment, the second-second rib may face pins that electrically connect the printed circuit board and the motor unit.

[0026] In some embodiments, a portion of the perimeter of the second-second rib may be angled radially outward.

[0027] According to an embodiment, the second rib portion may further include a high-voltage facing rib that faces the connection portion of the high-voltage connector and extends from the second-first rib to an outside of the area of ​​the first rib portion.

[0028] In an embodiment, the first rib portion may include a low-voltage facing rib that faces the connection portion of the low-voltage connector and extends radially outward from an area facing the printed circuit board.

[0029] According to an embodiment, the low-voltage facing rib may be arranged parallel to the high-voltage facing rib on the opposite side with respect to the vertical center line of the inverter cover.

[0030] According to an embodiment, the inverter cover may be formed from a single plate.

[0031] According to an embodiment, the first rib portion and the second rib portion may be formed by a stamping method.

[0032] According to an embodiment, the first rib portion may be provided with an avoidance portion to avoid interference with a fastening member for fastening the inverter cover to the housing.

[0033] According to an embodiment, the motor unit may further include a vibration prevention member coupled from the outside of the inverter cover toward the printed circuit board to prevent radiated noise generated from the inverter cover when the motor unit is operated.

[0034] According to an embodiment, the vibration prevention member may include a fixing member and a spacer, and the fixing member may be formed to penetrate the spacer and the spacer may be formed to surround the circumference of the fixing member.

[0035] According to an embodiment, the anti-vibration member may include a first anti-vibration member positioned at an arbitrary position of the inverter cover facing the motor unit; and a second anti-vibration member positioned spaced apart from the first anti-vibration member.

[0036] According to an embodiment, the first vibration prevention member may include a first spacer that is press-fitted into a gap between the inverter cover and the printed circuit board; and a first fixing member that is inserted into the first spacer from an outside of the inverter cover and coupled to the housing; and the second vibration prevention member may include a second spacer that is press-fitted into a gap between the inverter cover and the printed circuit board; and a second fixing member that is inserted into the second spacer from an outside of the inverter cover and coupled to the housing.

[0037] In some embodiments, the first spacer and the second spacer may extend to different lengths.

[0038] In some embodiments, the first spacer may extend longer than the second spacer.

[0039] According to an embodiment, the inverter cover may be formed with a first mounting groove in which the first spacer is mounted on the inside and a second mounting groove in which the second spacer is mounted.

[0040] According to an embodiment, the first and second spacers may be made of a metal material.

[0041] According to an embodiment, the printed circuit board may be formed with a first fixing member insertion hole for inserting the first fixing member and two fixing member insertion holes for inserting the second fixing member.

[0042] According to an embodiment, the printed circuit board may have a first contact portion formed around the first fixing member insertion hole, and a second contact portion formed around the second fixing member insertion hole.

[0043] According to an embodiment, the first contact portion may be electrically grounded by contacting the first spacer, and the second contact portion may be electrically grounded by contacting the second spacer.

[0044] According to an embodiment, the first vibration-preventing member may be disposed within the area of ​​the second-second rib.

[0045] According to an embodiment, the second vibration-preventing member may be disposed within an area of ​​the first rib portion between the second-first ribs.

[0046] According to the present invention, since the inverter cover is provided with a first rib portion and a second rib portion which are formed to be engraved on the inner surface of the inverter cover and protruded on the outer surface of the inverter cover at different depths, the inverter cover can be manufactured by a stamping method and additional machining is not required, so that the cost can be reduced. In other words, the shape of the rib portion is designed to be simplified and optimized so that the stamping method can be applied.

[0047] In addition, the rigidity of the inverter cover can be increased by the rib portion, and NVH can be improved due to the separation of natural frequencies. Specifically, the insulation distance from the printed circuit board can be maintained through the first rib portion, and the insulation distance from the pin can be maintained through the 2-2 rib of the second rib portion, and radiated noise can be reduced. Furthermore, the rigidity of the inverter cover can be increased through the 2-1 rib of the second rib portion.

[0048] Additionally, as the electric compressor further includes a vibration-prevention member, the radiated noise generated from the inverter cover during the operation of the electric compressor is reduced, and noise in a specific frequency band is reduced. The present embodiments further include a configuration capable of directly preventing vibration from the inverter cover, thereby stably reducing vibration of the inverter cover while maintaining coupling stability.

[0049] Additionally, vibration noise generation can be minimized for electric compressors of various specifications by optimizing the position of the vibration-preventing member.

[0050] The effects of the present invention are not limited to the effects described above, and should be understood to include all effects that can be inferred from the detailed description of the present invention or the composition of the invention described in the claims.

[0051] Figure 1 is a perspective view showing the inverter cover removed from a conventional electric compressor.

[0052] FIG. 2 is a cross-sectional view illustrating an electric compressor according to one embodiment of the present invention.

[0053] Fig. 3 is an exploded perspective view showing some components of the electric compressor of Fig. 2 in an exploded manner.

[0054] Fig. 4 is a front view of the electric compressor of Fig. 2.

[0055] Figure 5 is a front view showing the inverter cover separated from Figure 4.

[0056] Figure 6 is a back view of Figure 5.

[0057] Figures 7 and 8 are partial cross-sectional perspective views of different positions of the electric compressor of Figure 4.

[0058] FIG. 9 is a partial cross-sectional view illustrating an electric compressor according to another embodiment of the present invention.

[0059] Fig. 10 is a rear view and an enlarged cross-sectional view showing the inverter cover with the vibration prevention member combined in Fig. 9 separated.

[0060] Fig. 11 is an exploded perspective view showing the first and second spacers arranged on the printed circuit board of Fig. 9.

[0061] The advantages and features of the present disclosure, and methods for achieving them, will become clearer with reference to the embodiments described below in detail with the accompanying drawings. However, the present disclosure is not limited to the embodiments disclosed below, but may be implemented in various different forms. These embodiments are provided solely to ensure that the disclosure is complete and to fully inform those skilled in the art of the scope of the disclosure, and the present disclosure is defined solely by the scope of the claims. Like reference numerals designate like elements throughout the specification.

[0062] When one component is referred to as being "connected to" or "coupled to" another component, it includes both cases where it is directly connected or coupled to the other component, or where there is another component intervening therebetween. Conversely, when one component is referred to as being "directly connected to" or "directly coupled to" another component, it indicates that there is no other component intervening therebetween. "And / or" includes each and any combination of one or more of the mentioned items.

[0063] The terminology used herein is for the purpose of describing embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular includes the plural unless the context clearly dictates otherwise. As used herein, the terms "comprises" and / or "comprising" do not exclude the presence or addition of one or more other components, steps, operations, and / or elements.

[0064] Although terms like "first," "second," etc. are used to describe various components, these components are not limited by these terms. These terms are used only to distinguish one component from another.

[0065]

[0066] First, an electric compressor according to an embodiment of the present invention will be described with reference to FIGS. 2 to 8.

[0067] Referring to Figures 2 and 3, the configuration of the electric compressor is briefly examined. The electric compressor includes a housing (10), a compression unit (3) that compresses refrigerant, a motor unit (2) that is provided in the housing (10) and drives the compression unit (3), and an inverter unit (100).

[0068] The housing (10) formed to a predetermined size forms the overall appearance of the electric compressor, and in this embodiment, is composed of a center housing (12), a motor housing (11), and a rear housing (14).

[0069] The motor unit (2) is provided within a space formed by the motor housing (11) and the center housing (12), and provides power for the compression unit (3) to compress the refrigerant. The motor unit (2) includes a rotor (2b) coupled to a rotation shaft (2a) rotatably installed at the center of the motor housing (11), and a stator (2c) fixed to the motor housing (11) and arranged radially outside the rotor (2b). The stator (2c) includes a stator core (2c1) and a coil (2c2) wound around the stator core (2c1).

[0070] The compression unit (3) is provided inside the rear housing (14) and includes a rotary scroll (3a) coupled to a rotary shaft (2a) through an eccentric bush, and a fixed scroll (3b) fixed between the center housing (12) and the rear housing (14) to form a compression chamber in which compression of the refrigerant is performed together with the rotary scroll (3a).

[0071] In this way, since the compression unit (3) is connected to the motor unit (2) through the rotation shaft (2a), the rotational force generated in the motor unit (2) can be transmitted to the rotary scroll (3a) of the compression unit through the rotation shaft (2a). However, this is not limited to this, and it goes without saying that a compression unit of another type can be used.

[0072] The inverter unit (100) is placed on one side of the housing (10), but is placed on the opposite side of the compression unit (3) with respect to the motor unit (2). The inverter unit (100) is electrically connected to the motor unit (2), and supplies power to the motor unit (2) and controls its operation through power and control signals transmitted from the outside.

[0073] More specifically, the stator (2c) forms an electromagnetic field by the power applied from the inverter unit (100), and as the rotor (2b) rotates by the electromagnetic field formed by the stator (2c), a rotational force for driving the compression unit (3) is generated.

[0074] At this time, as illustrated in Fig. 1, the motor unit (2) and the inverter unit (100) can be electrically connected by pins (5). In this embodiment, since a three-phase motor is used, three pins (5) each connected to the three phases can be provided to supply three-phase power from the inverter unit (100) to the motor unit (2). The three pins (5) are electrically connected to the three-phase coils of the stator (2c), extend through the motor housing (11), and electrically connect to the printed circuit board (101) of the inverter unit (100) by penetrating the printed circuit board (101) to be described later.

[0075] Specifically, the inverter unit (100) may include a printed circuit board (PCB) (101) placed within an open side of the housing (10) and an inverter cover (120) coupled to the housing (10) to cover the printed circuit board (101).

[0076] In this embodiment, one side of the motor housing (11) is open and is extended radially outward from the portion where the motor section (2) is arranged so that a printed circuit board (101) to which switching elements are connected can be installed inside.

[0077] The inverter cover (120) is coupled to the motor housing (11) so that the printed circuit board (101) can be stored therein.

[0078] A sealing member may be provided between one side of the motor housing (11) and the inverter cover (120) as needed. Since a printed circuit board (101) is mounted inside one side of the motor housing (11), a sealing member is formed along the edge of one side of the motor housing (11) to ensure stable sealing, thereby preventing the inflow of moisture and foreign substances.

[0079] The inverter unit (100) according to the present embodiment may further include a CM choke (not shown), a high voltage connector (40), and a low voltage connector (50) in addition to the printed circuit board (101) and the inverter cover (120).

[0080] A high voltage connector (40) is provided to supply high voltage on the vehicle side to an inverter, for example, and a low voltage connector (50) is provided to supply low voltage or transmit a signal to an electrical component that operates at low voltage among electrical components provided in the vehicle.

[0081]

[0082] Below, the structure of the inverter cover (120) will be examined in detail with reference to FIGS. 4 to 8.

[0083] In the present invention, the inverter cover (120) is provided with a first rib portion (310) and a second rib portion (320) which are formed to be engraved on the inner surface (120a) of the inverter cover and protruded on the outer surface (120b) of the inverter cover at different depths. The inner surface (120a) of the inverter cover corresponds to a surface facing the printed circuit board (101), and the outer surface (120b) of the inverter cover corresponds to a surface facing the outside of the inverter unit (100).

[0084] The first rib portion (310) is formed to be engraved with respect to the inner surface (120a) of the inverter cover and protruded with respect to the outer surface (120b) of the inverter cover in an area facing the printed circuit board (101) with a first depth (d1). It is preferable that the first rib portion (310) be formed in all areas facing the printed circuit board (101) in accordance with the shape of the printed circuit board (101), thereby maintaining an insulating distance from the printed circuit board (101).

[0085] The second rib (320) is at least partially positioned within the area of ​​the first rib (310), and is formed to be engraved on the inner surface (120a) of the inverter cover and protruding on the outer surface (120b) of the inverter cover with a second depth (d2) greater than the first depth (d1).

[0086] In the present embodiment, the second rib portion (320) includes a second-first rib (321) that is positioned within the area of ​​the first rib portion (310) and includes one or more bent portions, and a second-second rib (322) that is positioned spaced apart from the second-first rib (321) within the area of ​​the first rib portion (310) and has at least a portion of the edge having a constant curvature.

[0087] The 2-1 rib (321) is provided to increase the rigidity of the inverter cover (120) and includes one or more bends (321a) to maximize the length. In the present embodiment, the 2-1 rib (321) is designed in an S shape, including two bends (321a). The 2-1 rib (321) is positioned above the 2-2 rib (322).

[0088] At this time, the radius (R) of the bend portion (321a) of the 2-1 rib (321) can be appropriately selected as a radius (R) for productivity considering the stamping process characteristics. If the radius (R) of the bend portion (321a) of the 2-1 rib (321) is too large, the size of the 2-1 rib (321) becomes too large and occupies too much area in the inverter cover (120), and if it is too small, pressing cannot be performed.

[0089] The 2nd-2 rib (322) is formed in an area facing the three pins (5) that electrically connect the printed circuit board (101) and the motor unit (2) so that an insulating distance can be maintained without interfering with the three pins (5). (See Fig. 1) In addition, the 2nd-2 rib (322) reduces radiated noise.

[0090] The perimeter of the 2-2 rib (322) is basically formed as a circle with a constant curvature, but for the productivity of the stamping process, a part of the perimeter of the 2-2 rib (322) may be angled toward the radially outer side. In the present embodiment, a part of the perimeter of the 2-2 rib (322) on the side facing the 2-1 rib (321) is angled at approximately 90° toward the radially outer side, which makes it easy to adjust the depth of the 2-2 rib (322).

[0091] In some cases, the second rib (320) may further include a high-voltage facing rib (323) facing the connection portion (42) of the high-voltage connector and extending from the second-first rib (321) to the outside of the area of ​​the first rib (310) to avoid contact with the connection portion (42) of the high-voltage connector that connects the high-voltage connector (40) to the printed circuit board (101) (see FIG. 7).

[0092] Additionally, in some cases, the first rib (310) may include a low-voltage facing rib (311) that faces the connection portion (52) of the low-voltage connector and extends radially outward from the area facing the printed circuit board (101) to avoid contact with the connection portion (52) of the low-voltage connector that connects the low-voltage connector (50) to the printed circuit board (101) (see FIG. 8).

[0093] In this embodiment, since the connection part (42) of the high-voltage connector includes bolting, the high-voltage facing rib (323) is formed to be engraved more deeply into the inner surface (120a) of the inverter cover than the low-voltage facing rib (311), and the low-voltage facing rib (311) is arranged parallel to the high-voltage facing rib (323) on the opposite side with respect to the vertical center line (C) of the inverter cover (120).

[0094] In addition, the first rib portion (310) may further be provided with an avoidance portion (312) to avoid interference with the fastening member (400) for fastening the inverter cover (120) to the housing (10). In the present embodiment, there is a possibility that the first rib portion (310) may interfere with the fastening member (400) fastened to the lowermost side of the inverter cover (120), so one avoidance portion (312) is provided on the lower side of the first rib portion (310). However, the position and number of avoidance portions (312) may be changed depending on the position and number of interference between the first rib portion (310) and the fastening member (400).

[0095] In the present embodiment, the inverter cover (120) is plate-type and is formed from a single plate. In addition, the first rib portion (310) and the second rib portion (320) are designed to have simplified and optimized shapes, and are formed to be engraved on the inner surface (120a) of the inverter cover and protruded on the outer surface (120b) of the inverter cover, so that they can be formed by a stamping method. In this way, by pressing the plate-type inverter cover (120) by a stamping method to form the first rib portion (310) and the second rib portion (320), the inverter cover (120) can be easily produced, and the cost can be reduced because an expensive die-casting process is not used and additional machining is not required.

[0096] Moreover, despite the change in the manufacturing process and the simplification of the shape of the rib portion, the rib portion (310, 320) of the present invention has an equivalent natural frequency compared to the conventional rib portion. That is, it can be seen that the electric compressor of the present invention can improve NVH due to the increased rigidity of the inverter cover (120) by the rib portion (310, 320) and the separation of natural frequencies, and in particular, can be maintained at an equivalent level to the conventional one.

[0097]

[0098] Next, an electric compressor according to another embodiment of the present invention will be described with reference to FIGS. 10 to 13.

[0099] Referring to Fig. 10, a brief look at the configuration of an electric compressor includes a housing (10), a compression unit (3) that compresses refrigerant, a motor unit (2) that is provided in the housing (10) and drives the compression unit (3), an inverter unit (100), and a vibration-prevention member (200). That is, the electric compressor illustrated in Fig. 10 differs from the electric compressor illustrated in Fig. 2 only in that it further includes a vibration-prevention member (200). Below, the vibration-prevention member (200) will be described with emphasis.

[0100] The electric compressor of the present embodiment includes a vibration prevention member (200) coupled from the outside of the inverter cover (120) toward the printed circuit board (101) to prevent radiated noise generated from the inverter cover (120) when the motor unit (2) is operated.

[0101] The vibration prevention member (200) according to the present embodiment is installed to reduce the radiated noise generated in the high frequency range due to vibration transmitted to the inverter cover (120) arranged facing the axial direction of the electric compressor while the motor unit (2) is in operation and to minimize the generation of unnecessary vibration.

[0102] The vibration-preventing member (200) is a type of vibration-proof member and can eliminate noise generated in the high-frequency band among the radiated noise generated when the inverter cover (120) vibrates, thereby enabling quiet operation of the electric compressor.

[0103] The vibration prevention member (200) includes a fixing member (first and second fixing members) and a spacer (first and second spacer), and the fixing member is formed to penetrate the spacer and the spacer is formed to surround the circumference of the fixing member.

[0104] To this end, the vibration prevention member (200) includes a first vibration prevention member (210) positioned at an arbitrary position of the inverter cover (120) facing the motor unit (2), and a second vibration prevention member (220) positioned spaced apart from the first vibration prevention member (210). The second vibration prevention member (220) can be positioned at an arbitrary position of the inverter cover (120) not facing the motor unit (2).

[0105] The vibration-prevention member (200) is installed to reduce and improve noise in the high-frequency range, among which the radiated noise generated by vibration is measured in various frequency bands. While the present embodiment is described as advantageous in reducing high-frequency noise, it should be noted that noise reduction in other frequency bands is also possible.

[0106] In particular, in this embodiment, since the radiated noise from the inverter cover (120) is generated not only at a specific location but also throughout the entire body, vibration can be reduced more efficiently when the first and second vibration prevention members (210, 220) are installed at different locations.

[0107] A first insertion hole (120c) into which a first vibration prevention member (120) is inserted is formed in the inverter cover (120), and a second insertion hole (120d) into which a second vibration prevention member (120) is inserted is formed.

[0108] At this time, it is preferable that the first vibration prevention member (210) be placed within the area of ​​the 2-2 rib (322) described above. Since the radiated noise due to vibration in the inverter cover (120) is generated overall, but is particularly generated mainly in the area of ​​the 2-2 rib (322), the first vibration prevention member (210) is installed within the area of ​​the 2-2 rib (322).

[0109] In this embodiment, the first vibration prevention member (210) is coupled at a position that is spaced apart radially from the center of the area of ​​the second-second rib (322). The position at which the first vibration prevention member (210) is installed is positioned at the aforementioned position in consideration of the position at which maximum vibration occurs in the area of ​​the second-second rib (322) and the layout with the printed circuit board (101), but it should be noted that it may be changed to another position.

[0110] In addition, it is preferable that the second vibration prevention member (220) be placed within the area of ​​the first rib portion (310) between the second-first ribs (321). Since radiated noise is also generated in the area above the second-second ribs (322), the second vibration prevention member (220) is installed to reduce radiated noise generated from the inverter cover (120) together with the first vibration prevention member (210).

[0111] In particular, since the second vibration prevention member (220) is placed within the area of ​​the first rib portion (310) but between the second-first ribs (321), the second-first ribs (321) protruding from the outer surface (120b) of the inverter cover are placed on the upper and lower sides, respectively, based on the position where the second vibration prevention member (220) is installed.

[0112] The reason why the second vibration prevention member (220) is coupled to the area of ​​the first rib portion (310) between the second-first ribs (321) is to attenuate the shaking and vibration transmitted to the inverter cover (120) by making maximum use of the structural form of the adjacent second-first rib (321).

[0113] For example, if some of the vibration transmitted to the second vibration prevention member (220) is transmitted to the second-first rib (321), noise in the diffusion and high-frequency ranges can be reduced, thereby reducing noise generated from the inverter cover (120) at the location shown in the drawing.

[0114] In one embodiment, the first vibration prevention member (210) includes a first spacer (212) that is pressed into a gap between the inverter cover (120) and the printed circuit board (101), and a first fixing member (214) that is inserted into the first spacer (212) from the outside of the inverter cover (120) and coupled to the housing (10).

[0115] The second vibration prevention member (220) includes a second spacer (222) that is pressed into the gap between the inverter cover (120) and the printed circuit board (101), and a second fixing member (224) that is inserted into the second spacer (222) from the outside of the inverter cover (120) and coupled to the housing (10).

[0116] The first and second spacers (212, 222) are installed in surface contact with the upper surface of the printed circuit board (101), and serve as grounding when in contact with the printed circuit board (101).

[0117] In particular, the first and second spacers (212, 222) serve to fix the printed circuit board (101) and the inverter cover (120), thereby preventing the inverter cover (120) from shaking outward and inward in the axial direction, thereby minimizing the generation of high-frequency noise.

[0118] The first and second spacers (212, 222) are made of a metal material and maintain electrical conductivity.

[0119] A first fixing member insertion hole (101a) is formed in the printed circuit board (101) for inserting a first fixing member (214), and a second fixing member insertion hole (101b) is formed for inserting a second fixing member (224).

[0120] In the printed circuit board (101), a first contact portion (101c) is formed around the first fixing member insertion hole (101a), and a second contact portion (101d) is formed around the second fixing member insertion hole (101b). Copper with high thermal conductivity is used for the first and second contact portions (101c, 101d), but other materials may also be used.

[0121] As a result, the first contact portion (101c) comes into contact with the first spacer (212) and is electrically grounded, and the second contact portion (101d) comes into contact with the second spacer (222) and is electrically grounded.

[0122] The first and second contact portions (101c, 101d) are formed so that hatching is performed in a size corresponding to the outer diameter of the first and second spacers (212, 222) when the printed circuit board (101) is manufactured. In addition, the first and second contact portions (101c, 101d) may be formed with a predetermined thickness on the upper surface of the printed circuit board (101).

[0123] When the first spacer (212) is grounded with the first contact portion (101c), the normal grounding function can be implemented together, so that even if an unexpected leakage current occurs, the phenomenon of it being applied to the electronic element mounted on the printed circuit board (101) can be prevented, so that the operational safety of the electric compressor can be maintained at a constant level.

[0124] In this embodiment, the first spacer (212) and the second spacer (222) extend to different lengths, and in particular, the first spacer (212) disposed in the area of ​​the second rib (320) (area of ​​the second-2 rib (322)) extends longer than the second spacer (222) disposed in the area of ​​the first rib (310).

[0125] The reason why the first spacer (212) is extended longer than the second spacer (222) is to reduce high-frequency noise generated from the inverter cover (120), and because the first vibration prevention member (210) equipped with the first spacer (212) corresponds to an area where the radiated noise increases more significantly than the second vibration prevention member (220) equipped with the second spacer (222).

[0126] The first and second spacers (212, 222) are formed in a cylindrical shape so that the first and second fixing members (214, 224) are inserted in the axial direction, respectively, and the first and second fixing members (214, 224) are inserted into the opened center, respectively.

[0127] The first and second spacers (212, 222) are illustrated as bolts, for example, but may be changed into various other forms.

[0128] The first and second fixing members (214, 224) are connected to the printed circuit board (101) and the housing (10) via the first and second spacers (212, 222) on the outside of the inverter cover (120), thereby maintaining a stable assembly state.

[0129] In this case, the electric compressor can prevent vibration of individual parts by assembling the housing (10), printed circuit board (101), and inverter cover (120) as individual parts, thereby preventing radiated noise due to vibration.

[0130] In the inverter cover (120), a first mounting groove (121) in which a first spacer (212) is mounted on the inside and a second mounting groove (122) in which a second spacer (222) is mounted are formed, respectively.

[0131] The first and second settling grooves (121, 122) allow one side of the first and second spacers (212, 222) to be partially settling, thereby improving stability during assembly, and after the first and second fixing members (214, 222) are installed, the first and second spacers (212, 222) are always kept in close contact with the first and second settling grooves (121, 122), thereby increasing the bonding strength.

[0132] Above, one embodiment of the present invention has been described, but a person having ordinary skill in the art will be able to modify and change the present invention in various ways by adding, changing, deleting or adding components, etc., within the scope that does not depart from the spirit of the present invention described in the claims, and this will also be considered to be included within the scope of the rights of the present invention.

[0133] The present invention relates to an electric compressor in which the inverter cover can be manufactured by a stamping method, thereby reducing the cost, while the rigidity of the inverter cover can be increased and NVH can be improved by a rib portion.

Claims

1. Housing; A compression unit that compresses the refrigerant; A motor unit provided within the housing and driving the compression unit; and An inverter unit is disposed on one side of the housing and controls the motor unit; The above inverter part, A printed circuit board disposed within an open side of the housing; and Including an inverter cover coupled to the housing to cover the printed circuit board; An electric compressor, characterized in that the inverter cover is provided with a first rib portion and a second rib portion which are formed to be engraved on the inner surface of the inverter cover and protruded on the outer surface of the inverter cover at different depths.

2. In paragraph 1, An electric compressor, characterized in that the first rib portion is formed to be engraved with respect to the inner surface of the inverter cover and protruded with respect to the outer surface of the inverter cover in an area facing the printed circuit board with a first depth.

3. In paragraph 2, An electric compressor, characterized in that the second rib portion is disposed at least partially within an area of the first rib portion, and is formed to be engraved with respect to an inner surface of the inverter cover and protruded with respect to an outer surface of the inverter cover with a second depth greater than the first depth.

4. In paragraph 3, An electric compressor, wherein the second rib portion comprises a second-first rib disposed within an area of the first rib portion and including one or more bent portions.

5. In paragraph 4, An electric compressor, wherein the second rib portion further includes a second-2 rib, which is spaced apart from the second-1 rib within an area of the first rib portion and has at least a portion of an edge having a constant curvature.

6. In paragraph 5, An electric compressor, characterized in that the second rib faces the pins that electrically connect the printed circuit board and the motor unit.

7. In paragraph 5, An electric compressor, characterized in that a portion of the circumference of the second-second rib is angled toward the radial outer side.

8. In paragraph 4, An electric compressor, wherein the second rib portion further includes a high-voltage opposing rib that faces the connection portion of the high-voltage connector and extends from the second-first rib to an outside of the area of the first rib portion.

9. In paragraph 8, An electric compressor, wherein the first rib portion includes a low-voltage facing rib that faces a connection portion of the low-voltage connector and extends radially outward from an area facing the printed circuit board.

10. In paragraph 9, An electric compressor, characterized in that the low-voltage opposing rib is arranged parallel to the high-voltage opposing rib on the opposite side with respect to the vertical center line of the inverter cover.

11. In paragraph 1, An electric compressor, characterized in that the inverter cover is formed from a single plate.

12. In paragraph 1, An electric compressor, characterized in that the first rib portion and the second rib portion are formed by a stamping method.

13. In paragraph 2, An electric compressor, characterized in that the first rib portion is provided with an avoidance portion for avoiding interference with a fastening member for fastening the inverter cover to the housing.

14. In paragraph 5, An electric compressor further comprising a vibration-preventing member coupled from the outside of the inverter cover toward the printed circuit board to prevent radiated noise generated from the inverter cover when the motor unit operates.

15. In paragraph 14, An electric compressor, characterized in that the vibration-preventing member includes a fixed member and a spacer, the fixed member penetrating the spacer and the spacer being formed to surround the circumference of the fixed member.

16. In paragraph 15, The above vibration prevention member is a first vibration prevention member positioned at an arbitrary position of the inverter cover facing the motor unit; and An electric compressor, comprising a second vibration-preventing member positioned spaced apart from the first vibration-preventing member.

17. In paragraph 16, The first vibration prevention member includes a first spacer that is pressed into a gap between the inverter cover and the printed circuit board; and a first fixing member that is inserted into the first spacer from the outside of the inverter cover and is coupled to the housing; An electric compressor, wherein the second vibration-preventing member includes: a second spacer that is pressed into a gap between the inverter cover and the printed circuit board; and a second fixing member that is inserted into the second spacer on the outside of the inverter cover and coupled to the housing.

18. In paragraph 17, An electric compressor, characterized in that the first spacer and the second spacer extend to different lengths.

19. In Article 17, An electric compressor, characterized in that the first spacer is extended longer than the second spacer.

20. In paragraph 18, An electric compressor, characterized in that the inverter cover has a first mounting groove formed on the inside into which the first spacer is mounted, and a second mounting groove formed into which the second spacer is mounted.

21. In paragraph 20, An electric compressor, characterized in that the first and second spacers are made of a metal material.

22. In paragraph 17, An electric compressor, characterized in that the printed circuit board has a first fixing member insertion hole formed into which the first fixing member is inserted, and two fixing member insertion holes formed into which the second fixing member is inserted.

23. In paragraph 22, An electric compressor, characterized in that the printed circuit board has a first contact portion formed around the first fixing member insertion hole, and a second contact portion formed around the second fixing member insertion hole.

24. In paragraph 23, An electric compressor, characterized in that the first contact portion is electrically grounded by contacting the first spacer, and the second contact portion is electrically grounded by contacting the second spacer.

25. In paragraph 16, An electric compressor, characterized in that the first vibration-preventing member is arranged within an area of the second-second rib.

26. In paragraph 16, An electric compressor, characterized in that the second vibration-preventing member is arranged within an area of the first rib portion between the second-first ribs.

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