KR20200043815A - Motor operated compressor - Google Patents

Abstract

The present invention relates to a motor-operated compressor. According to the present invention, the motor-operated compressor may comprise: a casing having a motor chamber; a driving motor accommodated in the motor chamber; a frame fixed on the casing on one side of the driving motor; a first scroll supported by the frame; a second scroll placed between the frame and the first scroll to make a turning motion by being engaged with a wrap of the first scroll such that a compression chamber is formed between the second scroll and the first scroll; a back pressure chamber groove formed in a ring shape to have a preset area on one side surface of the second scroll facing the frame; a back pressure hole placed on the second scroll to make the compression chamber communicate with the back pressure chamber groove; and a sealing member slidably inserted into the back pressure chamber groove to form a back pressure chamber together with the back pressure chamber groove. Accordingly, the present invention can secure a necessary pressure for the pressure of the back pressure chamber.

Description

Electric compressor {MOTOR OPERATED COMPRESSOR}

The present invention relates to a scroll-type electric compressor.

2. Description of the Related Art In general, compressors that play a role of compressing refrigerant in a vehicle air conditioning system have been developed in various forms, and in recent years, development of an electric compressor that is electrically driven using a motor has been actively performed in accordance with the trend of electric components of automobile parts.

Scroll compression method suitable for high-compression ratio operation is mainly applied to the electric compressor. In this scroll type electric compressor (hereinafter abbreviated as an electric compressor), an electric part made of a rotating motor is installed inside the sealed casing, and a compression part composed of a fixed scroll and a turning scroll is installed on one side of the electric part, and the electric part is installed. And the compression unit are connected to the rotating shaft so that the rotational force of the transmission unit is transmitted to the compression unit.

As disclosed in the patent document [Japanese Patent Laid-Open No. 2014-125957], the inside of a conventional electric compressor forms a motor chamber and accommodates a suction space in which refrigerant and oil sucked in, and a refrigerant and oil discharged in a compression chamber are accommodated. A discharge space forming a kind of oil separation space and a back pressure space for receiving the mist oil (hereinafter, gas oil) separated from the refrigerant in the discharge space and pressing the orbiting scroll toward the fixed scroll by the pressure of the gas oil are formed. It is done. The suction space is formed inside the main housing constituting the casing, the discharge space is formed in the rear housing constituting the casing together with the main housing, and the back pressure space is formed in the main frame coupled to the main housing to support the orbiting scroll in the axial direction.

In the conventional electric compressor as described above, a back pressure flow path is formed on the fixed scroll (or / and the main frame) so that gas oil is supplied from the discharge space to the back pressure space. At this time, a pressure reducing device is installed in the back pressure passage to reduce the pressure of the gas oil supplied to the back pressure space to adjust the pressure in the back pressure space.

However, in the conventional electric compressor as described above, as the back pressure space communicates with the discharge space through the back pressure passage, the back pressure of the back pressure space is affected by the pressure of the discharge space rather than the pressure of the compression chamber. Accordingly, even if the pressure of the compression chamber changes during operation, the back pressure is generally formed to be a constant pressure. When the back pressure is greater than the required back pressure, friction loss increases while both scrolls are in close contact with each other. If it is smaller than the required back pressure, compression loss may occur as both scrolls are separated from each other excessively.

In addition, in the conventional electric compressor, as the back pressure space is formed in the back pressure space portion where the balance weight is accommodated, the volume of the back pressure space increases, making it difficult to quickly secure the back pressure at the beginning of operation.

In addition, in the conventional electric compressor, the main bearing is provided in the back pressure space, but the life of the main bearing may be reduced while an excessive load is applied to the main bearing by the pressure in the back pressure space.

In addition, in the conventional electric compressor, the sealing member forming the back pressure space is inserted into the orbiting scroll or the main frame, but it may be difficult to secure the necessary sealing force when the pressure in the back pressure space rises excessively. In particular, even in the case of a high pressure refrigerant having a back pressure rising to 60 to 70 bar, such as a CO ₂ refrigerant, the back pressure space may not be effectively sealed, and the behavior of the turning scroll may become unstable.

Japanese Patent Publication No. 2014-125957 (published July 7, 2014)

An object of the present invention is to provide an electric compressor that allows the back pressure of the back pressure space to secure and maintain the required back pressure.

Furthermore, it is intended to provide an electric compressor capable of allowing the back pressure of the back pressure space to be interlocked with the pressure of the compression chamber.

In addition, another object of the present invention is to provide an electric compressor that allows the interior of the back pressure space to quickly form the required back pressure.

Furthermore, it is intended to provide an electric compressor capable of smoothly supporting the orbiting scroll while reducing the volume of the back pressure space.

In addition, another object of the present invention is to provide an electric compressor capable of increasing the life of the main bearing by reducing the load on the main bearing accommodated in the back pressure space portion.

In addition, another object of the present invention is to provide a motor-driven compressor that not only simplifies the structure of the pressure reducing device but also reduces the number of components constituting the pressure reducing device, thereby reducing manufacturing cost.

In order to achieve the object of the present invention, the compression chamber formed by the first scroll and the second scroll; An annular groove formed on a side opposite to the side on which the compression chamber is formed, on both sides in the axial direction of the second scroll; A back pressure hole communicating between the compression chamber and the annular groove; And slidingly axially inserted inside the annular groove to form the annular groove and the back pressure chamber, and the second scroll is caused by the pressure of the refrigerant in the compression chamber flowing into the back pressure chamber through the back pressure hole. It may be provided with an electric compressor comprising a; sealing member for moving in the axial direction with respect to the scroll.

Here, the back pressure hole may be in communication with the intermediate pressure chamber forming a pressure defined as the intermediate pressure between the suction pressure and the discharge pressure in the compression chamber.

In addition, in order to achieve the object of the present invention, a casing provided with a motor chamber; A drive motor accommodated inside the motor chamber; A frame fixed to the casing at one side of the drive motor; A first scroll supported on the frame; A second scroll provided between the frame and the first scroll, and engaged with the wrap of the first scroll to form a compression chamber between the first scroll and pivoting; A back pressure chamber groove formed in an annular shape to have a predetermined area on one side of the second scroll facing the frame; A back pressure hole provided in the second scroll and communicating between the compression chamber and the back pressure chamber groove; And a sealing member that is slidably inserted in the back pressure chamber groove to form a back pressure chamber together with the back pressure chamber groove.

Here, the sealing member is composed of a first sealing member and a second sealing member spaced a predetermined distance in the radial direction, the first sealing member is provided to face the inner wall surface of the back pressure chamber groove, the second sealing The member may be provided to face the outer wall surface of the back pressure chamber groove.

Further, a first pressing surface is formed on the outer surface of the first sealing member so that the first sealing member is pressed in the direction toward the inner wall surface and the frame of the back pressure seal groove, and the inner surface of the second sealing member is A second pressing surface may be formed such that the second sealing member is pressed in the direction toward the outer wall surface and the frame of the back pressure chamber groove.

In addition, the first pressing surface and the second pressing surface may be formed to be inclined to be symmetrical to each other at corners facing each other.

And, the back pressure chamber groove is made of a plurality of annular grooves, the back pressure hole is in communication with at least one of the plurality of annular grooves, the communication between the plurality of annular grooves between the plurality of annular grooves A flow path may be formed.

In addition, the back pressure chamber groove may be formed as one annular groove, and the back pressure hole may be formed to communicate between the first sealing member and the second sealing member.

Here, on one side in the axial direction of the back pressure chamber groove, an interval surface is formed such that a negative pressure surface opposite to the surface facing the frame among both sides in the axial direction of the sealing member is spaced apart from the back pressure chamber groove, and the spacing surface is the sealing surface. It may be formed smaller than the radial width of the member.

Here, the sealing member is made of a single annular member, the inner circumferential surface and the outer circumferential surface of the sealing member may be provided with a first sealing portion and a second sealing portion respectively contacting the inner wall surface and the outer wall surface of the back pressure seal groove.

In addition, the first sealing portion and the second sealing portion are formed to extend in the axial direction from the inner circumferential side and the outer circumferential side of the sealing member, and the first sealing portion and the second sealing portion are connected to the pressure of the refrigerant flowing into the back pressure chamber groove. Thereby, it is possible to contact the inner wall surface and the outer wall surface of the back pressure chamber groove.

In addition, the first sealing portion and the second sealing portion may be inserted into and coupled to the inner and outer circumferential surfaces of the sealing member, respectively.

In addition, the sealing member may be formed with a friction avoidance portion recessed or protruded by a predetermined area on a surface facing the frame.

Here, the back pressure hole may communicate with the compression chamber in which the pressure in the compression chamber forms an intermediate pressure between the suction pressure and the discharge pressure.

In addition, in order to achieve the object of the present invention, the first scroll; A second scroll in which a compression chamber is formed between the first scroll and engaged with the first scroll, and an annular groove is formed to form a back pressure chamber; And slidingly inserted into the groove to form the back pressure chamber, and moving the second scroll toward the first scroll while moving in the direction toward the first scroll or moving in the opposite direction according to the pressure of the back pressure chamber. An electric compressor may be provided, including; a back pressure plate that moves or moves in a spaced apart direction.

Here, a back pressure hole communicating between the compression chamber and the back pressure chamber is formed in the second scroll, and the back pressure hole may be formed through both sides of the axial direction of the second scroll.

In addition, the second scroll is axially supported by a frame, and an anti-rotation mechanism is provided between the second scroll and the frame to prevent rotation of the second scroll, and the back pressure chamber is more radial than the anti-rotation mechanism. It can be formed on the outside.

In the electric compressor according to the present invention, as the pressure in the back pressure space is formed to be interlocked with the pressure in the compression chamber, the pressure in the back pressure space can be changed according to the pressure change in the compression chamber, thereby maintaining the required back pressure. It is possible to suppress friction loss that may occur when the pressure is higher than the required back pressure, while suppressing compression loss that may occur when the pressure is lower than the required back pressure.

In addition, in the electric compressor according to the present invention, as the back pressure space is formed on the second scroll, the volume of the back pressure space is reduced, and through this, the required back pressure can be quickly formed to improve compressor efficiency. In addition, as the back pressure hole communicates with the intermediate pressure chamber immediately before the discharge chamber, the required back pressure can be secured more quickly even if the volume of the back pressure space is reduced. Furthermore, the radial area of the back pressure space is wider than the radial area of the compression chamber communicating with the back pressure space, so that the orbiting scroll can be stably supported.

In addition, in the electric compressor according to the present invention, as the main bearing supporting the rotating shaft is installed outside the back pressure space, the main bearing is not directly subjected to a load due to high pressure in the back pressure space, and through this, the life of the main bearing Can be extended.

In addition, in the electric compressor according to the present invention, as the sealing member forming the back pressure space is supported in the axial direction and the radial direction by the back pressure hole communicating with the compression chamber, the sealing force of the sealing member can be improved. Through this, even when a high pressure refrigerant such as CO ₂ refrigerant is applied, the back pressure space can be effectively sealed, so that the required back pressure can be smoothly secured.

1 and 2 are a perspective view and an assembled cross-sectional view of the electric compressor according to the present invention,
Figure 3 is a perspective view showing a separating orbiting scroll and a sealing member forming a back pressure chamber in the electric compressor according to the present invention,
Figure 4 is a cross-sectional view showing the compression unit including the orbiting scroll and the sealing member of Figure 3,
5 is an enlarged cross-sectional view of a part of FIG. 4,
6 and 7 are a perspective view and a plan view showing a sealing member according to the embodiment according to the type,
8 is an enlarged cross-sectional view illustrating the operation of the first sealing member and the second sealing member according to the present embodiment,
9A and 9B are cross-sectional views shown to explain a state in which a back pressure chamber is formed before and when starting in the electric compressor according to the present embodiment,
10 is a cross-sectional view showing another embodiment of the back pressure chamber groove according to the present embodiment,
11 to 13 are cross-sectional views showing other embodiments of the sealing member in the electric compressor according to the present embodiment.

Hereinafter, an electric compressor according to the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

The electric compressor according to the present invention is a scroll compressor configured to compress refrigerant by engaging two scrolls as a part of a refrigeration cycle device that sucks and compresses refrigerant. The scroll compressor of this embodiment uses a carbon dioxide (CO ₂ ) refrigerant to describe a high-temperature, high-pressure electric scroll compressor having a discharge pressure of 100 bar, more precisely, about 130 bar, and a discharge temperature of about 170 ° C. 1 and 2 are a perspective view showing an exploded view of an electric compressor according to the present invention and a cross-sectional view of the assembled view.

1 and 2, the electric compressor according to the present embodiment may include a casing 101, a main frame 102, a driving unit 103 and a compression unit 104. In addition, an inverter unit 200 for controlling the operation of the compressor may be installed outside the front cover 112 to be described later. Accordingly, the inverter unit 200 may be located on the opposite side of the compression unit 104 based on the driving unit 103. Hereinafter, a description will be given with the inverter unit side forward and the compression unit side opposite.

The casing 101 may be formed of a main housing 111, a front cover 112 and a rear cover 113.

The main housing 111 is made of a cylindrical shape with an open front end and a rear end, a front cover 112 at the front end, and a rear cover 113 at the rear end, respectively. And inside the main housing 111, a suction space (S1) constituting a motor chamber, and inside the rear cover (113), a first scroll (140) to be described later and a discharge space (S2) may be formed, respectively.

A drive unit 103, a frame and a compression unit 104 are accommodated in the suction space S1, and an oil separation unit 116 for separating oil from refrigerant discharged to the discharge space S2 is provided in the discharge space S2. Can be installed.

In addition, on the sidewall of the main housing 111, an intake port 111a communicating with the suction space S1 and an exhaust port 113a communicating with the discharge space S2 are formed on the sidewall of the rear cover 113, respectively. The oil separation unit 116 described above may be installed in the exhaust port 113a.

In addition, a first oil recovery hole 113b for recovering oil separated from the oil separation unit 116 is formed in the lower half of the rear cover 113, and a first oil recovery hole 113b is provided in the first scroll 140. ) May be formed a second oil recovery hole (142a) for guiding the gas oil recovered through the suction chamber (V1). An orifice 117 for depressurizing the gas oil guided to the suction chamber V1 may be installed in the first oil recovery hole 113b or the second oil recovery hole 142a. Accordingly, since the discharge space communicates with the suction chamber V1 through the first oil recovery hole 113b and the second oil recovery hole 142a, the oil separated by the oil separation unit 116 mixes with the gas, and the suction chamber The series of processes recovered with (V1) is repeated. This will be described later.

On the other hand, the main frame 102, the body portion 121 is formed in a circular disk shape, the edge of the body portion 121 is the front surface and the main housing of the scroll side wall portion 142 of the first scroll 140 ( It may be supported and coupled between the inner stepped surface 111b of 111).

In addition, a balance weight accommodating space part (hereinafter, accommodating space part) 122 accommodating the balance weight 136 to be described later is formed at the center of the main frame 102, and a rotating shaft ( 135), the balance weight 136 compensating for the imbalance due to the eccentric turning movement of the second scroll 150 may be rotatably received.

In addition, in the center of the back pressure space portion 122, the shaft portion 123 protrudes toward the front side, and in the center of the shaft portion 123, a shaft hole 124 through which the rotating shaft 135 is rotatably inserted is formed. do. The main bearing 161 described above is fixedly coupled to the inner circumferential surface of the shaft portion 123, and the inner circumferential surface of the shaft hole 124 is spaced apart from the outer circumferential surface of the rotating shaft 135. Accordingly, the rear side of the receiving space portion 122 to the first sealing member 191 Sealed by, but the front side of the receiving space portion 122 is opened to communicate with the suction space (S1).

On the other hand, the driving unit 103 includes a stator 131 and a rotor 132, and generates rotational force to drive the rotating shaft 135. In this embodiment, the stator 131 is fixed to the inner circumferential surface of the main housing 111 and may be formed in an annular shape to form a cylindrical space therein. In the inner space of the stator 131, the rotor 132 may be arranged to be spaced apart from the stator 131. The rotor 132 may be formed in a substantially cylindrical shape, and a rotation shaft 135 may be coupled to the center thereof. When power is supplied to the driving unit 103, the rotor 132 and the rotating shaft 135 may rotate together by the interaction of the stator 131 and the rotor 132.

The rotating shaft 135 may be accommodated inside the main housing 111 and may be rotatably supported on the main frame 102. The rear side of the rotating shaft 135 may be supported in the radial direction by the main bearing 161 mounted on the main frame 102. The inner ring of the main bearing 161 is composed of a deep groove ball bearing (Deep Groove Ball Bearing) that is coupled to the rotating shaft 135, the outer ring is respectively the main frame 102 may be press-fit into the main frame (102).

In addition, the front end of the rotating shaft 135 may be supported in the radial direction by the sub bearing 162 provided on the front cover 112. The sub bearing 162 may be mounted to the shaft support protrusion 114 formed on the inner surface of the front cover 112. Accordingly, a portion of the outer circumferential surface of the rotating shaft 135 is coupled to the rotor 132 to receive the rotational force generated by the driving unit 103.

Meanwhile, the compression unit 104 may include a first scroll 140 that is a fixed scroll and a second scroll 150 that is a orbiting scroll. The second scroll 150 is eccentrically coupled to the rotating shaft 135 coupled to the rotor 132 of the drive unit 103 and suctioned together with the first scroll 140 while pivoting with respect to the first scroll 140 Two pairs of compression chambers V are formed: a seal V1, an intermediate pressure chamber V2, and a discharge chamber V3.

The first scroll 140 is provided with a fixed side plate part 141 in a disc shape, and a scroll sidewall portion 142 protruding toward the main frame 102 is formed on one side of the fixed side plate part 141. You can. A second oil suction hole 142a, which will be described later, may be formed in the scroll sidewall part 142 through an axial direction.

In the central portion of the fixed side hard plate portion 141, a fixed wrap 143, which is engaged with the orbiting wrap 152 to be described later to form two pairs of compression chambers V, is formed to protrude, and the fixed side hard plate portion 141 At the edge, a suction port (not shown) communicating with the suction space S1 of the casing 101 is formed, and a discharge port 144 communicating with the discharge space S2 in the final compression chamber at the center of the fixed side hard plate part 141. Can be formed.

The second scroll 150 is formed in a disk shape, and the orbiting side plate part 151 is formed, and the first side of the orbiting side plate part 151 protrudes toward the fixed side plate part 141, and the fixed wrap 143 and An engaging orbiting wrap 152 is formed, and a boss groove 153 is formed on the second side surface of the orbiting side hard plate part 151 such that an eccentric bearing 163 supporting the rotating shaft 135 is inserted and fixed. Accordingly, the second scroll 150 may be coupled to the rotation shaft 135 with the eccentric bearing 163 and the balance weight 136 therebetween to receive rotational force.

Meanwhile, a support plate 170 for elastically supporting the second scroll 150 and preventing friction between the rear surface 121a of the frame 102 and the front surface 151a of the second scroll 150 facing the same ) May be provided.

The support plate 170 is formed of a thin steel plate material, and the anti-rotation pin 181 that is pressed into the frame 102 is penetrated and coupled. The anti-rotation pin 181 is pivotally coupled to the anti-rotation ring 182 coupled to the front surface 151a of the second scroll 150 to prevent rotation of the second scroll 150.

In addition, the sealing member 190 is coupled to the outside of the front surface edge of the second scroll 150, that is, the anti-rotation ring 182. The sealing member 190 forms a back pressure chamber (S3), which will be described later, which will be described later.

The electric compressor according to the present invention as described above is operated as follows.

That is, when power is applied to the driving unit 103, the rotating shaft 135 rotates with the rotor 132 of the driving unit 103 to transmit rotational force to the second scroll 150. Then, the second scroll 150 eccentrically connected to the rotating shaft 135 rotates by an eccentric distance by the anti-rotation member 180, and the compression chamber V is a radial center side of the rotating shaft 135 The volume decreases as it moves continuously toward the.

Accordingly, the refrigerant flows into the suction space (S1) constituting the motor chamber through the intake port (111a) is sucked into the compression chamber (V). At this time, the refrigerant may cool the stator 131 and the rotor 132 while passing through the driving unit 103.

Thereafter, the refrigerant sucked into the compression chamber V is compressed while moving toward the center along the movement path of the compression chamber V, and is formed between the first scroll 140 and the rear cover 113 through the discharge port 144. It is discharged to the discharge space (S2).

The refrigerant discharged into the discharge space S2 is separated from the oil in the discharge space S2 or oil components are separated while passing through the oil separation unit 116, and the refrigerant is discharged through a refrigeration cycle through the exhaust port 113a. On the other hand, the separated oil remains in the discharge space S2 as a gas oil in a mist state mixed with a trace amount of refrigerant, and the gas oil is introduced into the suction chamber through the first oil recovery hole and the second oil recovery hole described above ( V1) is recovered and then sucked into the intermediate pressure chamber (V2) and compressed together with the refrigerant to be sucked, and a series of processes discharged through the discharge chamber (V3) is repeated.

On the other hand, the pressure of the back pressure space, that is, the back pressure must be maintained at an appropriate pressure so that the behavior of the second scroll, orbiting scroll, can be stably maintained. If the back pressure is small, the supporting force with respect to the second scroll is weakened, and the adhesive force with the first scroll, which is a fixed scroll, decreases, thereby causing leakage in the compression chamber and increasing compression loss. On the other hand, if the back pressure is too large, the second scroll may make a pivoting movement in an excessively close contact with the first scroll, thereby increasing friction loss.

In particular, when the CO ₂ refrigerant is applied, the pressure in the back pressure space becomes approximately 60 to 70 bar, thereby forming a higher back pressure than when other refrigerants (134a, 410a, etc.) are applied. However, since the sealing force of the sealing member sealing the back pressure space is not uniform, the back pressure space may not be formed smoothly, and the load on the main bearing accommodated inside the back pressure space is increased to shorten the life of the main bearing. I was able to do it.

Accordingly, in the present invention, the pressure of the back pressure space is interlocked with the pressure of the compression chamber to suppress frictional loss or compression loss, and the sealing member forming the back pressure space is supported by the pressure of the compression chamber to increase the sealing force against the back pressure space. , By separating the space where the main bearing is installed and the back pressure space, the life of the main bearing can be extended.

FIG. 3 is a perspective view showing a turning scroll and a sealing member separately forming a back pressure chamber in an electric compressor according to the present invention, and FIG. 4 is a cross-sectional view showing a compression unit including a turning scroll and a sealing member of FIG. 3, 5 is a sectional view showing an enlarged portion of FIG. 4.

Referring to these drawings, the electric compressor according to the present exemplary embodiment is the second facing the frame (more precisely, the support plate) 102 in the turning side hard plate part 151 of the second scroll 150, which is a turning scroll. On the front surface 151a of the scroll 150, a back pressure chamber groove 155 forming a back pressure chamber S3 is formed, and in the back pressure chamber groove 155, a sealing member or back pressure plate forming a back pressure chamber together with the back pressure chamber groove 155 (Hereinafter abbreviated as a sealing member) is inserted into the sliding, the back pressure hole (156) so that the back pressure chamber (155) and the back pressure chamber (S3) formed by the sealing member (190) communicate with the compression chamber (V) Is formed. Accordingly, a portion of the refrigerant and oil compressed in the compression chamber V flows into the back pressure chamber S3 through the back pressure hole 156 to support the second scroll 150 toward the first scroll (! 40). This creates pressure.

For example, as shown in FIGS. 3 and 4, the second side surface of the turning side hard plate part 151, that is, the front surface 151a facing the support plate 170, has an annular shape to have a predetermined width and depth. The back pressure chamber groove 155 may be formed.

Although only one back pressure chamber groove 155 may be formed, a plurality of back pressure chamber grooves 155 may be formed at predetermined intervals in a radial direction. When there is one back pressure chamber groove 155, the first sealing member 191 and the second sealing member 192, which will be described later, are spaced apart at predetermined intervals in the radial direction, to the inner and outer wall surfaces of the back pressure chamber groove 155. Each can be inserted slidably. This will be described later.

However, when a plurality of back pressure chamber grooves 155 are formed as illustrated in FIG. 3, the first back pressure chamber groove 1551 into which the first sealing member 191 is inserted is inserted, and the second sealing member 192 is inserted therein. 2 back pressure chamber grooves 1552 may be respectively formed on the outside.

The first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 communicate with the compression chamber V through the back pressure hole 156. The compression chamber V may be in communication with the intermediate pressure chamber V2 forming an intermediate pressure between the suction pressure and the discharge pressure. However, in some cases, it may be in communication with the discharge chamber (V3) forming the discharge pressure.

The first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 may be respectively communicated with a compression chamber having different pressures, but may be communicated with a compression chamber having the same pressure. However, it may be advantageous in terms of the behavior of the first sealing member 191 and the second sealing member 192 that the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 communicate with the compression chamber having the same pressure. . That is, when the pressure of the back pressure chamber (S31) formed by the first back pressure chamber groove (1551) and the pressure of the back pressure chamber (S32) formed by the second back pressure chamber groove (1552) are different, the first sealing member 191 and the second sealing member The back pressure to 192 is different. Then, due to a pressure difference between the back pressure chambers S31 and S32, the behavior of the second scroll 150 may become somewhat unstable or leakage between the back pressure chambers may occur.

Accordingly, as shown in FIGS. 4 and 5, a partition wall 157 is formed between the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552, and the back pressure hole 156 communicates with the first back pressure chamber groove 1551. , A communication passage 158 communicating the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 may be formed in the partition wall 157. Accordingly, the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 may communicate with the compression chamber having the same pressure.

The first back pressure chamber groove 1551 is formed outside of the anti-rotation rings 182 provided on the front surface 151a of the second scroll 150. Accordingly, the second back pressure chamber groove 1552 positioned outside the first back pressure chamber groove 1551 is also located outside of the anti-rotation rings 182. As the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 are located outside the rotation preventing rings 182, the area of the back pressure chamber S3 is formed to be wide. This allows the second scroll 150 to be stably supported because the area where the back pressure acts can be secured even when the pressure per unit area of the back pressure is low. In addition, since the back pressure chamber groove 155 is able to secure sufficient back pressure while communicating with the intermediate pressure chamber V2 having a relatively low pressure, the pressure change in the back pressure chamber S3 is not large so that the back pressure can be uniformly maintained. . Through this, the second scroll 150 can be stably supported.

In addition, the first back pressure chamber groove 1551 or the second back pressure chamber groove 1552 is formed in a substantially rectangular cross-sectional shape when projecting in the circumferential direction, and the rear surface of each back pressure chamber groove 1551 (1552) forming a side surface of the first scroll side. Stepped gap surface (1551a) (1552a) may be formed on. The radial width of the spacing surfaces 1551a and 1552a is smaller than the radial width of the first sealing member 191 or the second sealing member 192. Accordingly, at least a portion of the rear surfaces 191a and 192a of the first sealing member 191 and the second sealing member 192 are exposed outside the spacing surfaces 1551a and 1552a. Then, the refrigerant flowing into each of the back pressure chamber grooves 1551 and 1552 moves toward the rear surfaces 191a and 192a of the first sealing member 191 and the second sealing member 192, and thus the direction of the support plate 170 It becomes possible to pressurize. Then, the first sealing member 191 and the second sealing member 192 can quickly move to the lower side so that the second scroll 150 can be moved upward.

The first sealing member 191 and the second sealing member 192 may each be formed in an annular shape using a material having lubricity, such as Teflon. Both the first sealing member 191 and the second sealing member 192 may be formed of a single sealing member. However, at least one of the first sealing member 191 and the second sealing member 192 may be formed as an overlapping sealing member in which the middle of the circumferential direction is cut and overlapped in the circumferential direction.

6 and 7 are a perspective view and a plan view showing a sealing member according to this embodiment by type.

For example, as shown in FIG. 6, when the first sealing member 191 and the second sealing member 192 are formed as a single-type sealing member, depending on the difference in processing accuracy or thermal expansion coefficient, the first sealing member 191 The inner circumferential surface does not seal the inner wall surface 1551b of the first back pressure seal groove 1551 closely, or the outer circumferential surface of the second sealing member 192 does not seal the outer wall surface 1552b of the second back pressure seal groove 1552 closely. It may not be possible.

On the other hand, as shown in FIG. 7, when the first sealing member 191 and the second sealing member 192 are formed as overlapping sealing members, the first sealing member 191 is retracted according to the pressure of the back pressure chamber S3. For example, it may be in close contact with the inner wall surface 1551b of the first back pressure chamber groove 1551 or may be in close contact with the outer wall surface 1552b of the second back pressure chamber groove 1552 as the second sealing member 192 opens. Then, the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 are tightly sealed to effectively seal the entire back pressure chamber.

In addition, even if the pressing surfaces are formed on the first sealing member 191 and the second sealing member 192, the sealing force of the first sealing member 191 and the second sealing member 192 may be increased.

8 is an enlarged cross-sectional view illustrating the operation of the first sealing member and the second sealing member according to the present embodiment.

For example, as shown in FIG. 8, the top edge of the outer circumferential side of the rear face 191a of the first sealing member 191 and the top edge of the inner circumferential side of the rear face 192a of the second sealing member 192 are respectively inclined. By chamfering, the first pressing surface 191b and the second pressing surface 192b may be respectively formed. The first pressing surface 191b and the second pressing surface 192b may be symmetrically formed to face each other. Accordingly, the first sealing member 191 is pressurized toward the inner wall surface 1551b and the support plate 170 of the first back pressure chamber groove 1551 while the second sealing member 192 is the second back pressure chamber groove 1552 ) May be pressured toward the outer wall surface 1552b and the support plate 170.

The electric compressor according to the present invention as described above has the following operational effects. 9A and 9B are cross-sectional views illustrating a state in which a back pressure chamber is formed before and when starting in the electric compressor according to the present embodiment.

As shown in FIG. 9A, the second scroll 150 is lowered toward the frame 102 (ie, moved toward the rear side of the drawing) before the compressor starts. At this time, the first sealing member 191 is inserted into the inside of the first back pressure chamber groove 1551, and the second sealing member 192 is inserted into the inside of the second back pressure chamber groove 1552, respectively. And, the cross section of the fixed wrap 143 is spaced apart from the inner side (or rear surface), which is the first side of the swivel side hard plate part 151, and the cross section of the swivel wrap 152 is made of the fixed side hard plate part 141. It is in a state spaced from the inner side (or front side) which is one side.

As shown in Figure 9b, when the compressor is started, the refrigerant is sucked into the suction space (S1) through the intake port (111a), this refrigerant is sucked into the suction chamber (V1) by the suction force generated by the compression unit (104) It is sucked into the first compression chamber and the second compression chamber, respectively. The refrigerant sucked into both compression chambers (V) is compressed by reducing the volume while each compression chamber (V) moves in the center direction. At this time, a part of the refrigerant and oil compressed in the compression chamber flows into the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 through the back pressure hole 156 and the communication passage 158. At this time, as the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 communicate with each other through the communication passage 158, the pressures of both back pressure chamber grooves 1551 and 1552 form the same pressure.

Then, the first sealing member 191 receiving the pressure of the first back pressure chamber groove 1551 descends while being in close contact with the inner wall surface 1551b of the first back pressure chamber groove 1551, while the pressure of the second back pressure chamber groove 1552 The second sealing member 192 receiving the pressure is lowered while being in close contact with the outer wall surface 1552b of the second back pressure chamber groove 1552.

Then, while the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 are tightly sealed, the pressures of the first back pressure chamber groove 1551 and the second back pressure chamber groove 1552 are further increased, and the second scroll 150 is increased. Is pushed in the direction from the frame 102 toward the first scroll 140 by the pressure of the first back pressure chamber groove 1551 and the pressure of the second back pressure chamber groove 1552.

Then, the second scroll 150 is floated toward the first scroll 140, so that the end face of the fixed wrap 143 is fixed to the inner surface of the turning side hard plate part 151, and the end face of the orbiting wrap 152 is fixed. Each of the side plates 141 is brought into contact with the inner surface, and accordingly, the compression chamber V is tightly sealed to compress the refrigerant.

Meanwhile, the refrigerant compressed in the compression chamber moves to the discharge chamber V3 and is discharged to the discharge space S2 through the discharge port 144. At this time, the refrigerant discharged from the compression chamber (V) to the discharge space (S2) is separated from the oil in the discharge space (S2) or the oil separation unit 116, the refrigerant is discharged to the refrigeration cycle device through the exhaust port (113a) On the other hand, the gas oil separated from the refrigerant remains in the discharge space S2 in a mist state. The gas oil is moved to the suction chamber V1 through the first oil recovery hole 113b, the orifice 117, and the second oil recovery hole 142a due to the pressure difference, and is sucked into the suction chamber V1. The refrigerant is sucked into the compression chamber (V).

In this way, according to the present invention, as the pressure in the back pressure space is interlocked with the pressure in the compression chamber, the pressure in the back pressure space is changed in response to the pressure change in the compression chamber, thereby maintaining the required back pressure. Through this, friction loss that may occur when the pressure in the back pressure space is higher than the required back pressure can be suppressed, while compression loss that can occur when the pressure in the back pressure space is lower than the required back pressure can be suppressed.

In addition, in the present invention, a back pressure space is formed inside the second scroll, and a back pressure hole is formed in the second scroll so that the back pressure space and the compression chamber communicate. Accordingly, the length of the back pressure hole is shortened so that the pressure in the back pressure space can quickly form the required back pressure. Furthermore, as the back pressure space is provided on the outside of the anti-rotation mechanism to form the back pressure, the area of the back pressure space is widened, so that the required back pressure can be quickly secured even at an intermediate pressure. Furthermore, as the main bearing supporting the rotating shaft is installed outside the back pressure space, the load on the main bearing can be reduced. Through this, the life of the main bearing can be extended.

In addition, according to the present invention, as the sealing member forming the back pressure space is supported in the axial direction and the radial direction by the back pressure hole communicating with the compression chamber, the sealing force of the sealing member can be improved. Through this, even when a high pressure refrigerant such as CO ₂ refrigerant is applied, it is possible to effectively seal the back pressure space to secure the required back pressure.

Meanwhile, although not illustrated in the drawings, two or more back pressure chamber grooves and sealing members according to the present embodiment may be provided. For example, three back pressure seal grooves and sealing members may be provided, and each back pressure seal groove and sealing members may be formed to be spaced apart at predetermined intervals along the radial direction.

When there is another embodiment of the sealing member in the electric compressor according to the present invention is as follows.

That is, in the above-described embodiment, a plurality of back pressure chamber grooves are provided, and the respective sealing members are slidably inserted into each of the back pressure chamber grooves, but in this embodiment, the plurality of sealing members are spaced apart from each other by a predetermined interval. It is provided.

10 is a cross-sectional view showing another embodiment of the back pressure chamber groove according to the present embodiment.

As shown in the figure, one back pressure chamber groove 155 according to the present embodiment is provided, and the first sealing member 191 and the second sealing member 192 are spaced apart at predetermined intervals in the radial direction, thereby back pressure chamber groove Each of the inner wall surface and the outer wall surface of 155 may be slidably inserted.

Even if a plurality of sealing members 191 and 192 are provided in one back pressure chamber groove 155 as described above, the basic configuration of the back pressure chamber groove 155 and the sealing members 191 and 192 and the effect of the action are the same. It may be the same as one embodiment. However, in the present embodiment, since only one back pressure chamber groove 155 is provided, a kind of partition wall 157 provided in the middle of the back pressure chamber groove 155 may be removed as in the above-described embodiment. Accordingly, there is no need to form a communication hole provided in the partition wall 157, which is relatively easy to process, and the back pressure can be improved while the area of the back pressure chamber groove is widened by the partition wall.

When there is another embodiment of the sealing member in the electric compressor according to the present invention is as follows.

That is, in the above-described embodiment, the sealing member inserted in the back pressure chamber groove is pushed in the radial and axial directions by the pressure of the refrigerant and oil flowing into the back pressure chamber groove through the back pressure hole in the compression chamber, thereby sealing each back pressure chamber groove. However, in the present embodiment, the sealing member is provided in the sealing member (or the back pressure plate) slidingly inserted into the back pressure chamber groove so that the sealing portion seals the inner wall surface and the outer wall surface of the back pressure chamber groove.

11 to 13 are cross-sectional views showing other embodiments of the sealing member in the electric compressor according to the present embodiment.

Referring to FIG. 11, the back pressure chamber groove 155 according to the present embodiment is formed in an annular shape on one side of the turning side hard plate part 151 facing the frame (support plate) as in the above-described embodiment. A plurality of back pressure chamber grooves 155 may be formed at predetermined intervals in the radial direction, but only one may be formed in consideration of the radial width of the sealing member 195. In the following embodiments, a case in which there is one back pressure chamber groove will be described as an example.

Inside the back pressure chamber groove (155), the sealing member (195) is inserted to slide axially from the back pressure chamber groove (155), and the inner wall surface or the rear surface of the back pressure chamber groove (155) facing the upper surface of the sealing member (195). The back pressure hole 157 communicating with the compression chamber (for example, the intermediate pressure chamber) V is formed.

The back pressure chamber groove 155 is formed in a rectangular cross-sectional shape when projecting in the circumferential direction, but an interval surface 155a for limiting the movement of the sealing member 195 may be stepped or inclined on the rear surface side.

The sealing member 195 may have a shape similar to a cross-section of the back pressure chamber groove 155, that is, an annular shape having a rectangular cross-sectional shape when projecting in the circumferential direction. The sealing member 195 may be formed in a single annular shape. The sealing member 195 may be preferably formed of a Teflon material or the like having lubricity.

In addition, when the sealing member 195 is formed in one piece to cover the opening surface of the back pressure seal groove 155, the area of the sealing member 195 increases and friction loss with the frame 102 or the support plate 170 occurs. You can. However, when the friction avoiding portion 195a is formed on the bottom surface of the sealing member 195 as in this embodiment, the frictional area between the sealing member 195 and the frame 102 or the support plate 170 is reduced to reduce friction loss. I can do it.

The friction avoiding portion 195a may be formed as an annular groove or may be formed as an annular projection.

Since the configuration of the sealing member 195 according to the present embodiment and the effect of the effect are the same as those of the above-described embodiment, a detailed description thereof will be omitted. However, in the present embodiment, as the back pressure chamber S3 is formed using one sealing member 195, the movement of the sealing member 195 is uniformly maintained compared to the above-described embodiment in which a plurality of sealing members are applied. It can be advantageous to secure a constant back pressure.

On the other hand, the above-described embodiment is provided so that the inner circumferential surface of the sealing member is in contact with the inner wall surface of the back pressure chamber groove, and the outer circumferential surface of the sealing member is respectively in contact with the outer wall surface of the back pressure chamber groove. It can be disadvantageous for the wide sealing member to move quickly.

Accordingly, as shown in FIG. 12, the inner circumferential surface and the outer circumferential surface of the sealing member 196 according to this embodiment are spaced apart from the inner wall surface and the outer wall surface of the back pressure chamber groove 155 by a predetermined distance, respectively, and the inner circumferential surface of the sealing member 1995 A first sealing portion 1961 and a second sealing portion 1962 may be provided on the outer circumferential surface, respectively, to seal between the inner wall surface and the outer wall surface of the back pressure chamber groove 155, respectively.

The first sealing portion 1961 and the second sealing portion 1962 may be formed to extend from the inner circumferential rear surface and the outer circumferential rear surface of the sealing member 196 or extend from the outer circumferential surface, respectively. In this case, it is preferable that the first sealing portion 1961 and the second sealing portion 1962 are formed to have a smaller thickness of the sealing portion from each connecting end contacting the sealing member 196 toward the opposite free end.

At this time, the first sealing portion 1961 and the second sealing portion 1962, as the respective sealing portions are opened in opposite directions by the pressure of the back pressure chamber groove 155 toward the inner wall surface and the outer wall surface of the back pressure chamber groove 155 It may be desirable to be formed to bend.

For example, the inner surface of the first sealing portion 1961 may be formed in an axial direction, while the outer surface may be formed to be inclined such that the thickness becomes thinner from the connection end to the free end. The second sealing portion 1962 may be formed in a shape opposite to that of the first sealing portion 1961. However, the first sealing portion 1961 and the second sealing portion 9152 of this embodiment are as short as possible in consideration of being caught on both sides of the sealing member 196 when excessively bent when applying a high pressure refrigerant such as CO ₂ refrigerant. It may be desirable to be thick. For example, the lengths of the first sealing portion 1961 and the second sealing portion 1962 may be formed to be two times or less compared to the width.

In this embodiment, the sealing member 196 may be formed in a square cross-sectional shape like the back pressure seal groove 155, but the friction avoidance part 196a for reducing friction loss on the bottom surface contacting the frame 102 or the support plate 170 ) May be formed as a projection or a groove.

As described above, when the first sealing portion 1961 and the second sealing portion 1962 are formed integrally on both sides of the sealing member 196, the pressure of the refrigerant and oil flowing into the back pressure chamber groove 155 may be applied. As the first sealing portion 1961 and the second sealing portion 1962 are opened, the first sealing portion 1961 is on the inner wall surface of the back pressure chamber groove 155, and the second sealing portion 1962 is the back pressure chamber groove 155. It is in close contact with the outer wall surfaces, respectively.

Then, a back pressure chamber (S3) is formed on the rear surface of the back pressure chamber groove (155) and the rear surface of the sealing member (196), the outer circumferential surface of the first sealing portion (1961), and the inner circumferential surface of the second sealing portion (1962). As the pressure of the intermediate pressure chamber V2 in communication with the back pressure chamber S3 increases by the hole 156, the pressure of the back pressure chamber S3 also increases and the sealing member 196 descends.

Then, when the bottom surface of the sealing member is in close contact with the frame 102 or the support plate 170, the second scroll 150 is raised toward the first scroll 140, and thus the first scroll 140 and the second scroll 150 ) To seal the compression chamber.

Since the configuration of the sealing member according to the present embodiment and the effect of the effect are the same as those of the above-described embodiment, a detailed description thereof will be omitted. However, in this embodiment, as the inner circumferential surface and the outer circumferential surface of the sealing member 196 are spaced apart from the inner wall surface and the outer wall surface of the back pressure chamber groove 155, the sealing member 196 can quickly respond to the pressure of the back pressure chamber S3. It can slide and move.

On the other hand, in the above-described embodiment, the first sealing portion and the second sealing portion are formed to extend from the inner and outer portions of the sealing member, respectively, but the first sealing portion and the second sealing portion may be formed by being inserted into the inner and outer circumferential surfaces of the sealing member. have.

For example, as shown in FIG. 13, the first sealing portion insertion groove 197a and the second sealing portion insertion groove 197b are formed on the inner circumferential surface and the outer circumferential surface of the sealing member 197, respectively, and the first sealing portion insertion groove ( 197a) and the second sealing portion insertion groove 197b may be coupled by inserting the first sealing portion 1971 and the second sealing portion 1972 in an annular shape.

The first sealing portion 1971 and the second sealing portion 1972 may be formed of O-rings made of a rubber material having a square cross-sectional shape or a circular cross-sectional shape, or may be formed of a material having Teflon or other lubricity. However, the first sealing portion 1971 and the second sealing portion 1972 may be formed in a plurality of each in the axial direction in consideration of the sealing force.

Also, in this case, a friction avoiding portion 197c may be formed on the bottom surface of the sealing member 197 to be recessed or protruded.

Since the effect on the sealing member of the electric compressor according to the present embodiment as described above is similar to the above-described embodiment, detailed description thereof will be omitted. However, in this embodiment, as the sealing portions 1971 and 1972 are inserted into the inner circumferential surface and outer circumferential surface of the sealing member 197, sufficient sealing force is obtained even if the gap between the sealing member 197 and the back pressure seal groove 155 is widened. Can be secured.

On the other hand, in the above-described embodiment, the electric compressor to which the CO2 refrigerant is applied was examined, but is not limited thereto.

What has been described above is only an embodiment for implementing the electric compressor according to the present invention, and the present invention is not limited to the above embodiments, and is within the scope not departing from the gist of the present invention as claimed in the following claims. Anyone who has ordinary knowledge in the field to which the present invention pertains will have the technical spirit of the present invention to the extent that various changes can be implemented.

111: main housing 112: front cover
113: rear cover 113a: the first oil recovery hole
116: oil separator 102: main frame
121: body portion 122: accommodation space portion
123: shaft part 124: shaft hole
131: stator 132: rotor
135: rotation axis 140: first scroll
141: fixed side plate portion 142: scroll side wall portion
143: fixed wrap 144: outlet
150: second scroll 151: turning side hard plate part
152: Turn Wrap 153: Boss Home
155: back pressure chamber groove 155a, 1551a, 1552a: spacing surface
1551,1552: first and second back pressure chamber groove 156: back pressure hole
157: bulkhead 158: communication hole
191,192: first and second sealing members 195,196,197: sealing members
195a, 196a, 197a: friction avoidance part 1951,1952: first and second sealing parts
S1: suction space (motor room) S2: discharge space
S3: Back pressure chamber

Claims (15)

A casing provided with a motor chamber;
A drive motor accommodated inside the motor chamber;
A frame fixed to the casing at one side of the drive motor;
A first scroll supported on the frame;
A second scroll provided between the frame and the first scroll, and engaged with the wrap of the first scroll to form a compression chamber between the first scroll and pivoting;
A back pressure chamber groove formed in an annular shape to have a predetermined area on one side of the second scroll facing the frame;
A back pressure hole provided in the second scroll and communicating between the compression chamber and the back pressure chamber groove; And
And a sealing member slidingly inserted in the back pressure chamber groove to form a back pressure chamber together with the back pressure chamber groove. According to claim 1,
The sealing member is made of a first sealing member and a second sealing member spaced apart by a predetermined distance in the radial direction,
The first sealing member is provided so as to face the inner wall surface of the back pressure chamber groove, and the second sealing member is provided to face the outer wall surface of the back pressure chamber groove. According to claim 2,
A first pressing surface is formed on the outer surface of the first sealing member so that the first sealing member is pressed in the direction toward the inner wall surface and the frame of the back pressure seal groove,
An electric compressor, characterized in that a second pressing surface is formed on the inner surface of the second sealing member so that the second sealing member is pressed in the direction toward the outer wall surface and the frame of the back pressure chamber groove. According to claim 3,
The first pressing surface and the second pressing surface is an electric compressor characterized in that it is formed to be inclined with respect to each other at opposite edges. According to claim 2,
The back pressure chamber groove is made of a plurality of annular grooves, and at least one of the plurality of annular grooves communicates with the back pressure hole, and between the plurality of annular grooves, there is a communication passage communicating the plurality of annular grooves. The electric compressor, characterized in that formed. According to claim 2,
The back pressure chamber groove is formed of a single annular groove, the back pressure hole is an electric compressor, characterized in that formed to communicate between the first sealing member and the second sealing member. The method according to any one of claims 1 to 6,
On one side in the axial direction of the back pressure chamber groove, an interval surface is formed so that a negative pressure surface opposite to the surface facing the frame among both sides in the axial direction of the sealing member is spaced apart from the back pressure chamber groove,
The spacing surface is an electric compressor, characterized in that formed smaller than the radial width of the sealing member. According to claim 1,
The sealing member is composed of a single annular member, the inner circumferential surface and the outer circumferential surface of the sealing member is provided with a first sealing portion and a second sealing portion for contacting the inner wall surface and the outer wall surface of the back pressure seal groove, respectively sealing compressor. The method of claim 8,
The first sealing portion and the second sealing portion are formed to extend axially from the inner circumferential side and the outer circumferential side of the sealing member, and the first sealing portion and the second sealing portion are formed by the pressure of the refrigerant flowing into the back pressure chamber groove. An electric compressor, characterized in that it is in contact with the inner wall surface and the outer wall surface of the back pressure chamber groove. The method of claim 8,
The first sealing portion and the second sealing portion is an electric compressor, characterized in that inserted into the inner peripheral surface and the outer peripheral surface of the sealing member, respectively. The method according to any one of claims 8 to 10,
The sealing member is a motor-driven compressor, characterized in that a friction avoidance portion is formed that is recessed or protruded by a predetermined area on the surface facing the frame. According to claim 1,
The back pressure hole is an electric compressor, characterized in that the pressure in the compression chamber communicates with the compression chamber forming an intermediate pressure between the suction pressure and the discharge pressure. A first scroll;
A second scroll in which a compression chamber is formed between the first scroll and engaged with the first scroll, and an annular groove is formed to form a back pressure chamber; And
It slides into the groove to form the back pressure chamber, and moves the second scroll in the direction toward the first scroll while moving in the direction toward the first scroll or moving in the opposite direction according to the pressure of the back pressure chamber. Electric compressor comprising a; back pressure plate to move in a direction to be spaced apart. The method of claim 13,
A back pressure hole communicating between the compression chamber and the back pressure chamber is formed in the second scroll,
The back pressure hole is formed by passing through both side surfaces of the second scroll in the axial direction. The method of claim 14,
The second scroll is axially supported by a frame, and an anti-rotation mechanism is provided between the second scroll and the frame to prevent rotation of the second scroll,
The back pressure chamber is an electric compressor, characterized in that formed in the radial direction outside than the rotation prevention mechanism.

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