KR20210101067A - Motor operated compressor - Google Patents

Abstract

According to the present invention, an electronic compressor comprises: a motor unit; a compression unit connected to the motor unit to be operated, forming a compression chamber compressing a refrigerant, and having an injection hole connected to the compression chamber; and a rear housing provided on one side of the compression unit and forming a discharge space from the compression unit. A pipe connection unit is formed in the rear housing, and the pipe connection unit comprises: a discharge pipe connection unit connecting the discharge space to a discharge pipe; and an injection pipe connection unit connecting the injection hole to an injection pipe. Therefore, installation of a refrigerant discharge passage and a refrigerant injection passage can be simplified. Thus, a compressor having the refrigerant discharge pipe and the refrigerant injection pipe can be minimized, has reduced weight, and reduces manufacturing cost.

Description

Electric Compressor {MOTOR OPERATED COMPRESSOR}

The present invention relates to a scroll type electric compressor driven by a motor.

A scroll compression method suitable for high compression ratio operation is mainly applied to electric compressors. Such a scroll-type electric compressor (hereinafter, referred to as an "electric compressor") is provided with a motor unit and a compression unit inside a housing, and is used in a refrigeration cycle device including a heat pump to compress a refrigerant.

Electric compressors are also provided in electric vehicles for the purpose of air conditioning and the like. In the case of a compressor provided in an electric vehicle, the size of the compression unit including the motor unit is limited due to the narrow installation space. Accordingly, techniques for improving the compression efficiency of the refrigerant without increasing the size of the compressor have been introduced.

As such a technique, a vapor injection method may be used. The vapor injection method is a technology of extracting a high-pressure vapor-state refrigerant from an outlet of a condenser constituting a refrigerant cycle and supplying it back to the compression chamber of the compressor.

As the refrigerant in the vapor state is re-supplied to the compression chamber, the amount of refrigerant compressed in the electric compressor is increased. Accordingly, the compression efficiency of the refrigerant may be improved, and the efficiency of the refrigerant cycle device including the heat pump may be improved. European Patent Publication EP0768464 A2 (Patent Document 1) and US Patent Publication No. US2015192124 A1 (Patent Document 2) disclose an example of a scroll compressor using a vapor injection method, respectively.

In Patent Document 1, one intermediate pressure chamber is formed between the fixed scroll and the rear housing, a plurality of injection holes communicating with the compression chamber are formed on both sides of the intermediate pressure chamber, and a check valve is installed in each of the injection holes. However, in Patent Document 1, the injection pipe constituting the injection passage passes through the housing in the axial direction to communicate with the intermediate pressure chamber.

Patent Document 2 discloses an example in which the injection passage is formed to communicate in the radial direction with respect to the housing. However, in Patent Document 2, an intermediate housing having an intermediate pressure chamber is provided between the fixed scroll and the rear housing, and an injection pipe is communicated through the outer circumferential surface of the intermediate housing, and the intermediate pressure chamber is communicated with an injection hole provided in the fixed scroll. have.

Further, in Patent Document 1 and Patent Document 2, the injection passage is provided separately from the intake port or the exhaust port, respectively, and is connected to the housing. Accordingly, the housing is separately provided with an injection connection part in addition to the intake connection part and the exhaust connection part which form the intake port and the exhaust port.

European Patent Publication EP0768464 A2 (published on: April 16, 1997) Japanese Patent Registration JP06-187266 B9 (Registration Date: 2017.08.10.)

An object of the present invention is to provide an electric compressor capable of simplifying the injection structure including the injection pipe.

Furthermore, an object of the present invention is to provide an electric compressor capable of achieving miniaturization and weight reduction by reducing the length of the compressor while simplifying the injection structure.

Furthermore, an object of the present invention is to provide an electric compressor capable of simplifying the installation of the discharge passage and the injection passage by integrating the injection passage into the refrigerant discharge passage.

Furthermore, an object of the present invention is to provide an electric compressor capable of reducing the body volume in the injection passage while reducing the length of the compressor including the injection pipe by radially connecting the injection pipe to the rear housing.

Furthermore, in the present invention, the oil is smoothly separated from the refrigerant discharged into the discharge chamber between the rear housing and the fixed scroll while radially connecting the injection pipe to the rear housing, and pressure pulsation due to the refrigerant discharged into the discharge chamber is prevented. An object of the present invention is to provide an electric compressor that can be lowered.

In order to achieve the object of the present invention, the main housing; a rear housing coupled to the main housing; a compression unit provided between the main housing and the rear housing to form a compression chamber including a suction pressure chamber, an intermediate pressure chamber, and a discharge pressure chamber, and a plurality of injection holes formed to communicate with the intermediate pressure chamber; a discharge space formed between the compression unit and the rear housing; an injection passage passing through the rear housing in a radial direction and injecting a refrigerant having an intermediate pressure between a suction pressure and a discharge pressure into the intermediate pressure chamber; and an exhaust port passing through the rear housing in a radial direction and communicating with the discharge space.

Here, a plurality of fastening holes are formed in the rear housing in a circumferential direction, and the injection passage and the exhaust port may be formed between two fastening holes adjacent to each other.

Here, the injection passage and the exhaust port may be arranged in an axial direction or a radial direction.

In addition, a single pipe connection protrusion protruding in a radial direction may be formed in the rear housing, and the injection passage and the exhaust port may be formed through the pipe connection protrusion in a radial direction.

In addition, a discharge pipe connection groove and an injection pipe connection groove are formed on the end surface of the pipe connection protrusion, a part of the discharge pipe is inserted into the discharge pipe connection groove, and a part of the injection pipe is inserted into the injection pipe connection groove to be coupled. can

In addition, a pipe connection block is coupled to the pipe connection protrusion, and the discharge pipe and the injection pipe are inserted and coupled to the pipe connection block, and the discharge pipe and the injection pipe protrude from the pipe connection block and the discharge pipe It may be inserted into the connection groove and the injection connection groove.

A sealing member may be provided between the discharge pipe and the discharge pipe connection groove, and between the injection pipe and the injection connection groove, respectively.

In addition, in order to achieve the object of the present invention, a motor unit: a compression unit connected to the motor unit and operated, forming a compression chamber for compressing a refrigerant, and having an injection hole communicating with the compression chamber; and a rear housing provided at one side of the compression unit and forming a discharge space between the compression unit and the compression unit, wherein a pipe connection part is formed in the rear housing, and the pipe connection part includes the discharge space to the discharge pipe. There may be provided an electric compressor in which a discharge pipe connecting part for connecting and an injection pipe connecting part for connecting the injection hole to the injection pipe are formed.

Here, the rear housing includes a housing rear portion facing the compression portion and a housing side portion protruding along the circumference from one side of the housing rear portion to form the discharge space, and the pipe connection portion is radial from the outer circumferential surface of the housing side portion can be extended to

In addition, a plurality of fastening holes are formed in the rear housing along a circumferential direction, and the pipe connection part may be formed between two fastening holes adjacent to each other.

Here, the discharge pipe connection part and the injection pipe connection part may be arranged in parallel.

In addition, the discharge pipe connection part and the injection pipe connection part may be arranged in an axial direction.

And, the discharge pipe connection part may be formed to be adjacent to the compression part than the injection pipe connection part.

In addition, the discharge pipe connection part and the injection pipe connection part may be arranged in a circumferential direction.

Here, a discharge pipe connection groove and an injection pipe connection groove are formed on the end surface of the pipe connection part, and an end of the discharge pipe and an end of the injection pipe are inserted into the discharge pipe connection groove and the injection pipe connection groove to be connected. have.

A pipe connection block may be coupled to the pipe connection part, and the discharge pipe and the injection pipe may be inserted into the pipe connection block to be coupled.

A sealing member may be provided between the discharge pipe and the discharge pipe connection groove and between the injection pipe and the injection pipe connection groove, respectively.

Here, an injection passage is formed between the injection pipe connection part and the injection hole, and the injection passage includes: an injection chamber that is opened toward an outer circumferential surface of the rear housing; and an injection port formed in a direction crossing the injection chamber and communicating the injection chamber with the injection hole.

And, one end of the injection chamber passes through the outer circumferential surface of the rear housing, the other end of the injection chamber is formed to be blocked inside the discharge space, and one end of the injection port is in the injection chamber inside the discharge space. communicated, and the other end of the injection port may be opened toward the compression part to communicate with the injection hole.

In addition, the injection hole and the injection port are each formed in plurality to correspond to each other, and at least one injection port among the plurality of injection ports is provided on one side with respect to the longitudinal centerline of the injection chamber, and the plurality of injections At least one injection port among the ports may be inclined.

In addition, a plurality of the injection holes and the injection ports may be formed to correspond to each other, and the injection chamber may be formed to overlap at least one injection port among the plurality of injection ports during axial projection.

In addition, the injection hole and the injection port may be formed in plurality to correspond to each other, the injection chamber may be formed in one, and the plurality of injection ports may be in communication with the one injection chamber, respectively.

In addition, a plurality of the injection holes and the injection ports may be formed to correspond to each other, a plurality of the injection chambers may be formed, and the plurality of injection ports may communicate with the plurality of injection chambers one-to-one, respectively.

Here, the injection passage may be provided with an injection valve for opening and closing the injection passage, and the injection valve may be provided on an upstream side of the injection port.

Here, the injection passage may be provided with an injection valve for opening and closing the injection passage, and the injection valve may be provided on a downstream side of the injection port.

In the electric compressor according to the present embodiment, the installation of the refrigerant discharge passage and the refrigerant injection passage can be simplified by integrating the injection passage into the coolant discharge passage. Through this, it is possible to reduce the size and weight of the compressor including the refrigerant discharge pipe and the refrigerant injection pipe, and it is possible to reduce the manufacturing cost.

In addition, in the electric compressor according to this embodiment, the discharge pipe and the injection pipe are connected to the pipe connection protrusion by connecting the discharge pipe and the injection pipe to the refrigerant discharge passage and the refrigerant injection passage, respectively. The injection pipe can be easily assembled, simplifying the pipe connection work.

In addition, in the electric compressor according to this embodiment, the refrigerant discharge passage communicating with the exhaust port and the injection passage communicating with the injection hole are formed through the rear housing in a radial direction, thereby reducing the length of the compressor including the injection structure of the electric compressor. Miniaturization and light weight can be realized. In addition, it is possible to increase the energy efficiency of a vehicle equipped with an electric compressor.

In addition, in the electric compressor according to the present embodiment, the inlet of the injection passage is formed as a single passage, but the outlet of the injection passage is formed to be inclined, thereby reducing the dead volume of the injection passage and increasing the compressor efficiency.

In addition, the electric compressor according to this embodiment forms the inlet of the injection passage in a plurality of passages, but by forming the inlet length of the injection passage to correspond to the outlet position of the injection passage, the dead volume of the injection passage is further reduced to further improve the compressor efficiency. can be raised

In addition, the electric compressor according to this embodiment installs a single injection valve at the inlet of the injection passage to control a plurality of injection ports, thereby reducing the number of parts for the injection valve and reducing assembly man-hours, thereby reducing manufacturing costs. have.

In addition, in the electric compressor according to the present embodiment, an injection valve is installed at the outlet of the injection passage to individually control a plurality of injection ports, thereby reducing the dead volume in the injection passage to increase compressor efficiency.

In addition, in the electric compressor according to the present embodiment, by forming the inlet and outlet of the injection passage to be perpendicular to each other, it is possible to facilitate processing of the injection passage.

In addition, in the electric compressor according to this embodiment, by forming the injection passage in an arc shape between the rear housing and the compression unit, the structure of the injection passage can be simplified and the refrigerant can be quickly discharged using the injection passage. have.

1 is a perspective view showing an electric compressor according to the present embodiment,
Figure 2 is a cross-sectional view showing the inside of the electric compressor according to Figure 1;
3 is a cross-sectional view showing a part of the electric compressor in FIG. 2;
4 is an enlarged cross-sectional view of part "A" of FIG. 3;
5a and 5b are "III-III" front sectional views of FIG. 4, and are cross-sectional views showing embodiments of the end surface of the pipe connection protrusion;
6 is an exploded perspective view of the fixed scroll and the rear housing in FIG. 1;
7 is a plan view showing the coupling state of the fixed scroll and the rear housing in FIG. 6;
8 is a plan view showing the exterior of the rear housing in FIG. 6;
9 is a plan view showing the inside of the rear housing in FIG. 8;
Fig. 10 is a cross-sectional view of Fig. 9;
11A and 11B are a sectional view "IV-IV" and a sectional view "V-V" of FIG. 10;
12 is a perspective view showing another embodiment of the rear housing;
13 is a plan view of FIG. 12;
14 is a cross-sectional view showing another example of the injection valve;
15 is a plan view of the rear housing showing another embodiment of the injection passage;
Fig. 16 is a cross-sectional view of Fig. 15;
17 is a plan view of the rear housing showing another embodiment of the injection passage;
18 is a cross-sectional view of FIG. 17 ;
19 is an enlarged cross-sectional view of part "B" of FIG. 18;
"VI-VI" front sectional view of FIG. 19 of FIG. 20,
21 is a cross-sectional view showing another example of the injection chamber in FIG. 19;
22 is a plan view showing another embodiment of the injection passage in FIG. 18;
23 is a plan view showing another embodiment of the injection passage in FIG. 18;
24 is a sectional view of "VII-VII" of FIG. 23;
25 is a plan view showing another embodiment of the injection passage in FIG. 18;
26 is a "VIII-VIII" front sectional view of FIG. 25;
27 is a perspective view of the rear housing showing another embodiment of the injection passage;
Fig. 28 is a plan view of Fig. 27;
Fig. 29 is a front sectional view of "IX-IX" of Fig. 28;

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

1 is a broken perspective view of the electric compressor according to the present embodiment, FIG. 2 is a cross-sectional view showing the inside of the electric compressor according to FIG. 1, and FIG. 3 is a cross-sectional view showing a part of the electric compressor in FIG. The motor-driven compressors shown in FIGS. 1 to 3 are illustrated by taking the motor-driven compressor using the refrigerant 134a as an example, but may be equally applied to the motor-driven compressor using the _{carbon dioxide (CO 2 ) refrigerant or the like.}

1 and 2 , the electric compressor according to the present embodiment includes a housing 10 , a compression unit 20 , a motor unit 30 , an inverter unit 40 , and an injection unit 50 .

The housing 10 forms the exterior of the electric compressor. The inner space of the housing 10 is sealed, and the compression unit 20 and the motor unit 30 are accommodated in the inner space of the housing 10 . The inverter unit 40 is installed outside the housing 10 and is electrically connected to the motor unit 30 by using the energizing unit 45 .

In addition, as the housing 10 is arranged in the transverse direction with respect to the ground, the compression unit 20 and the motor unit 30 are arranged in the transverse direction, and the compression unit 20 is located on the rear side, and the motor unit 30 are installed on the front side, respectively. For convenience, the right side of FIGS. 1 and 2 is defined as the front side, and the left side is defined as the rear side.

1 and 2 , the housing 10 according to the present embodiment is discharged together with the main housing 11 forming the motor chamber (or suction space) S1 and the fixed scroll 21 to be described later. and a rear housing 12 forming a seal (or discharge space) S2.

The main housing 11 has an open front end and a rear end, and a frame portion 111 is integrally formed between the front end and the rear end. However, the frame part 111 may be separately manufactured and fixedly coupled to the inner circumferential surface of the main housing 11 . Hereinafter, an example in which the frame part 111 extends radially from the inner circumferential surface of the main housing 11 will be mainly described.

In addition, an inverter housing 41 to be described later is coupled and sealed to the open front end of the main housing 11 , and the rear housing 12 is coupled to and sealed to the open rear end of the main housing 11 . Accordingly, the inner space of the housing 10 is sealed.

In addition, an intake port 112 to which a suction pipe (not shown) is connected is formed through the vicinity of the front end of the main housing 11 . The intake port 112 is formed to communicate with the motor chamber S1 of the main housing 11 opposite to the compression unit 20 with respect to the motor unit 30 . Accordingly, the refrigerant sucked into the motor chamber S1 through the intake port 112 passes through the motor unit 30 and is sucked into the compression unit 20 .

In addition, on the inner circumferential surface of the rear end of the main housing 11, the scroll fixing surface 113 is formed to be stepped, and the fixed head plate 211 of the fixed scroll 21, which will be described later, is placed on the scroll fixing surface 113 in the axial direction. is supported by The fixed scroll 21 is fixedly coupled by the force of bolting the main housing 11 and the rear housing 12 in a state where the fixed end plate 211 is sandwiched between the main housing 11 and the rear housing 12. do.

Further, as described above, the frame portion 111 of the main housing 11 extends radially from the inner circumferential surface of the main housing 11 and is formed in a hollow shape. A shaft portion 111a, which is rotatably supported through a rotation shaft 33, which will be described later, penetrates through the center of the frame portion 111 and is formed.

In addition, in the center of the rear surface of the frame part 111, a bearing fixing part 111b for accommodating the main bearing 151 is continuously formed from the bearing part 111a, and a balance weight ( 331) is accommodated, and an intermediate pressure space 111c constituting the back pressure chamber S3 is continuously formed, and on the outside of the intermediate pressure space 111c, a scroll support surface portion ( 111d) are formed one after the other.

Here, the main bearing 151 may be formed of a bush bearing, but may be formed of a ball bearing such as a deep groove ball bearing as shown in FIG. 1 or FIG. 2 . As the main bearing 151 is a ball bearing, the rotating shaft 33 passing through the bearing hole 212 of the frame part 111 is supported in radial and axial directions by the main bearing 151 .

In addition, the first back pressure sealing member 161 is inserted and coupled to the inner circumferential surface of the bearing portion 111a. The first back pressure sealing member 161 is formed in a U-shaped cross-sectional shape and is formed in an annular shape to surround the outer circumferential surface of the rotation shaft 33 . Accordingly, the first back pressure sealing member 161 seals the intermediate pressure space 111c forming the back pressure chamber S3 together with the second back pressure sealing member 162 to be described later.

In addition, a suction through hole 111e for guiding the refrigerant sucked into the motor chamber S1 of the main housing 11 to the compression unit 20 is formed at the edge of the frame portion 111 . The suction through hole 111e may be formed through the scroll support surface portion 111d.

In addition, one suction through-hole 111e may be formed, but a plurality of suction holes 111e may be formed at regular intervals along the circumferential direction from the edge of the frame portion 111 . Accordingly, the refrigerant sucked into the motor chamber S1 is sucked into the compression chamber V through the suction through-hole 111e.

In addition, an anti-rotation mechanism (not shown) for preventing rotation of the orbiting scroll 22 is provided between the bearing fixing part 111b and the suction through-hole 111e on the rear surface of the frame part 111 . Although the anti-rotation mechanism is not shown in the drawings, an Oldham ring or a pin and ring structure may be applied. Since this is known in the electric compressor, a detailed description thereof will be omitted.

Meanwhile, the rear housing 12 according to the present embodiment is coupled to the main housing 11 at the rear side of the fixed scroll 21 to be described later. A plurality of bolt fastening holes 122b that are bolted to the bolt fastening grooves 113a of the main housing 11 are formed in the housing side part 122 to be described later. The plurality of bolt fastening holes 122b are formed at predetermined intervals along the circumferential direction to correspond to the bolt fastening grooves 113a.

1 to 3 , the rear housing 12 includes a housing rear portion 121 and a housing side portion 122 .

The housing rear part 121 forms the rear surface of the electric compressor and is formed in a clogged plate shape. The housing side part 122 extends annularly along the circumference from the front side surface of the housing rear part 121 and is coupled to the rear end of the main housing 11 . Accordingly, the inner surface 121a of the housing rear portion 121 and the inner surface 122a of the housing side portion 122 form the discharge chamber S2 described above.

An injection passage 50a, which will be described later, is formed in a straight or arc shape on the inner surface 121a of the housing rear portion 121, and the injection passage 50a communicates with the intermediate pressure chamber V2. Accordingly, a portion of the refrigerant that has passed through the condenser (not shown) is re-supplied to the compression chamber V through the injection pipe IP, the injection passage 50a, and the injection hole 211d.

A discharge pipe DP is connected to the housing side part 122 and an exhaust port 123 for guiding the refrigerant discharged to the discharge chamber S2 to the condenser (not shown) of the refrigerating cycle is formed through radially. In addition, the inlet of the injection passage 50a is formed through the housing side portion 122 in the radial direction so that the above-described injection pipe (IP) is connected.

On the other hand, the housing side part 122 is formed with a pipe connection protrusion 124 constituting a pipe connection part, and a discharge pipe connection part (unsigned) and an injection pipe connection part (unsigned) are formed in the pipe connection protrusion 124 .

The discharge pipe connection part and the injection pipe connection part have the same inner diameter and may be formed in a radially penetrating hole shape. In this case, the discharge pipe and the injection pipe may be individually inserted and connected to the discharge pipe connection part and the injection pipe connection part, respectively, or may be connected collectively using a separate connection member (for example, a pipe connection block to be described later). . When the discharge pipe and the injection pipe are collectively connected using the pipe connection block, the pipe connection between the discharge pipe and the injection pipe can be simplified. Therefore, hereinafter, an example of collectively connecting the discharge pipe and the injection pipe using the pipe connection block will be mainly described.

A discharge pipe connection groove 124a constituting a discharge pipe connection part and an injection pipe connection groove 124b constituting an injection pipe connection part are formed on the end surface of the pipe connection protrusion 124 . The discharge pipe connection groove (124a) and the injection pipe connection groove (124b) are formed in parallel in the lateral direction (axial direction). The discharge pipe connection groove 124a is formed at the end of the outlet side of the exhaust port 123 to form a passage for communicating the exhaust port 123 with the discharge pipe DP, and the injection pipe connection groove 124b is the injection passage 50a. It is formed at the end of the inlet side of the injection passage (50a) to form a passage communicating with the injection pipe (IP).

The pipe connection protrusion 124 is formed to protrude from the outer circumferential surface of the housing side part 122 in the radial direction, and between the bolt fastening holes 122b so as not to interfere with the bolt fastening holes 122b of the rear housing 12 . is formed in Accordingly, the discharge pipe connection part including the exhaust port 123 and the injection pipe connection part including the injection passageway 50a are between two bolt fastening holes 122b adjacent to each other in the circumferential direction, that is, the same bolt fastening hole 122b. is formed between

In addition, the pipe connection protrusion 124 is formed in a substantially rectangular shape, depending on the relative position of the discharge pipe connection groove (124a) and the injection pipe connection groove (124b) is formed elongated in the axial direction or can be formed long in the circumferential direction. . This embodiment shows an example in which the pipe connection protrusion 124 is formed long in the axial direction, and the pipe connection protrusion will be described later together with the injection part.

Next, the compression unit will be described.

Referring to FIG. 2 , the compression unit 20 according to the present embodiment includes a fixed scroll 21 and an orbiting scroll 22 . The fixed scroll 21 and the orbiting scroll 22 are engaged with each other to form a compression chamber.

As described above, the fixed scroll 21 is fixed between the main housing 11 and the rear housing 12, and the orbiting scroll 22 is coupled to the rotating shaft 33 to form the frame portion 111 and the fixed scroll ( 21), a rotational movement is made between them. Accordingly, the fixed scroll 21 is fixedly coupled to the housing 10, and together with the orbiting scroll 22, a pair of compression chambers (V) composed of a suction pressure chamber (V1), an intermediate pressure chamber (V2), and a discharge pressure chamber (V3). ) is formed.

In addition, the fixed scroll 21 and the orbiting scroll 22 may be formed of the same aluminum material (aluminum, aluminum alloy). In this case, a wear-resistant coating layer may be formed on the surface of the fixed scroll 21 or the orbiting scroll 22 in consideration of wear due to the same type of material.

In addition, the fixed scroll 21 and the orbiting scroll 22 may be formed of different materials. In this case, the wear-resistant coating layer may not be formed on the surfaces of the fixed scroll 21 and the orbiting scroll 22 . In addition, when the fixed scroll 21 and the orbiting scroll 22 are formed of different materials, it is preferable in terms of motor efficiency to form the orbiting scroll 22 as hard. For example, the fixed scroll 21 may be formed of cast iron, and the orbiting scroll 22 may be formed of an aluminum material. Hereinafter, an example in which the fixed scroll 21 is made of cast iron and the orbiting scroll 22 is made of aluminum will be mainly described.

The fixed scroll 21 includes a fixed end plate 211 and a fixed wrap 212 .

The fixed head plate part 211 is formed in a disk shape. The fixed head plate part 211 may be formed in a simple disk shape, or a side brick part (not shown) may be formed by extending the edge of the fixed head plate part 211 .

In addition, when the fixed end plate 211 is formed in a simple disk shape, the front and rear surfaces of the fixed end plate 211 are supported and fixed to the main housing (frame unit) and the rear housing 12, respectively. On the other hand, when the side brick part is extended, the front surface of the side brick part is supported in the axial direction by the main housing (frame part) 11 , and the rear surface of the fixed end plate part 211 is supported by the rear housing 12 . and is fixed

The side brick portion may be formed in a cylindrical shape, or may be formed of a plurality of protrusions spaced apart in the circumferential direction. However, the weight of the fixed scroll 21 increases as the side brick portion extends from the fixed end plate 211 and is formed. In particular, when the fixed scroll 21 is formed of cast iron, the weight of the compressor may be greatly increased.

Accordingly, in consideration of the weight of the compressor, it is advantageous to apply the fixed scroll 21 in which the fixed head plate 211 has a disk shape. Then, even if the fixed scroll 21 is formed of cast iron, it is possible to reduce the weight of the compressor. This is also the case when the fixed scroll 21 is formed of an aluminum material. Hereinafter, an example in which the fixed head plate has a simple disk shape will be mainly described.

In addition, the front surface of the fixed end plate 211 is supported in the axial direction by being placed on the scroll fixed surface 113 provided in the main housing 11 , and the rear surface of the fixed end plate 211 is the rear surface of the rear housing 12 . It is supported in close contact with the open end.

In addition, a plurality of fastening protrusion receiving grooves 211a are formed on the outer circumferential surface of the fixed end plate 211 in the circumferential direction. Accordingly, as a fastening portion for fastening bolts is formed in the main housing 11 and the rear housing 12 in the housing 10 , the compressor can be further reduced in size and weight.

In addition, as the side bricks are not formed in the fixed end plate 211 , a separate suction port is not formed in the fixed scroll 21 . Therefore, since the suction end of the fixing wrap 212, which will be described later, faces the inner circumferential surface of the main housing 11, the suction end of the fixing wrap 212 serves as a kind of suction port.

In addition, a discharge port 211b is formed in the fixed head plate portion 211 , and a plurality of bypass holes 211c are formed around the discharge port 211b. The discharge port 211b is formed to communicate with the discharge pressure chamber V3 at approximately the center of the fixed head plate 211 , and the plurality of bypass holes 211c are formed to communicate with the intermediate pressure chamber V2 , respectively.

The plurality of bypass holes 211c may be formed at the same rotation angle with a phase difference of approximately 180° to communicate with the intermediate pressure chamber V2 having the same pressure. Accordingly, the discharge port 211b discharges the refrigerant from the discharge pressure chamber V3, which is the final compression chamber, to the discharge chamber S2, and the plurality of bypass holes 211c move from the intermediate pressure chamber V2 to the discharge chamber S2. refrigerant is discharged.

Here, a valve assembly 25 for opening and closing the discharge port 211b and the bypass hole 211c is provided on the rear surface of the fixed end plate 211 facing the rear housing 12 . The valve assembly 25 may include a discharge valve for opening and closing the discharge port 211b and a bypass valve for opening and closing the bypass hole 211c as a single body, or may be formed separately by separating the discharge valve and the bypass valve. have. This embodiment discloses an example in which the discharge valve and the bypass valve are integrated.

For example, the valve assembly 25 is provided on the rear side of the valve plate 251 for opening and closing the discharge port 211b and the bypass hole 211c, and the valve plate 251, the degree of opening of the valve plate 251. It may be made of a retainer 252 that limits the .

The valve plate 251 is formed of a thin steel plate, and a discharge valve part 251a for opening and closing the discharge port 211b is formed in the center, and a bypass hole 211c is opened and closed on both sides of the discharge valve part 251a, respectively. A plurality of bypass valve portions 251b are formed to extend from the discharge valve portion 251a.

The retainer 252 is formed of a metal plate thicker than the valve plate 251, and a discharge retainer portion 252a limiting the discharge valve portion 251a is formed in the center, and a bypass valve is formed on both sides of the discharge retainer portion 252a. Bypass retainer portions 252b for limiting the portions 251b, respectively, are formed extending from the discharge retainer portion 252a.

In addition, a plurality of injection holes 211d are formed at an intermediate position of the fixed end plate 211, for example, outside the bypass hole 211c. The plurality of injection holes 211d may be formed to communicate with the intermediate pressure chamber V2 having a lower pressure than the intermediate pressure chamber V2 through which the bypass hole 211c communicates.

Also, the plurality of injection holes 211d may be formed at the same rotation angle with a phase difference of approximately 180° to communicate with the intermediate pressure chamber V2 having the same pressure as the bypass hole 211c.

In addition, the plurality of injection holes 211d communicate with the injection passage 50a provided in the rear housing 12 so that the high-pressure refrigerant passing through the condenser (not shown) flows into the corresponding intermediate pressure chamber V2. . The injection passage will be described later together with the rear housing.

On the other hand, the fixed wrap 212 is formed integrally extending from the front surface of the fixed end plate (211). The fixed wrap 212 may be formed in various ways, such as an involute shape, a logarithmic spiral shape, or a non-involute shape like the orbiting wrap 222 to be described later. Since this is known in the electric compressor, a detailed description thereof will be omitted.

The orbiting scroll 22 includes a turning head plate part 221 and a turning wrap 222 .

The revolving mirror plate 221 is formed in a disk shape. The revolving mirror plate part 221 may be formed in the shape of a disc in which the compression chamber is separated from the back pressure chamber (or the intermediate pressure space part) S3 .

However, in some cases, a back pressure hole (not shown) may be formed so that the compression chamber V and the back pressure chamber S3 communicate with each other. In this case, the refrigerant and oil move between the back pressure chamber S3 and the compression chamber V through the back pressure hole according to the difference between the pressure in the back pressure chamber S3 and the pressure in the compression chamber V.

In addition, a back pressure sealing groove 221a is formed at the edge of the front surface of the revolving mirror plate 221 so that the second back pressure sealing member 162 is inserted. The second back pressure sealing member 162 seals the intermediate pressure space 111c forming the back pressure chamber S3 together with the first back pressure sealing member 161 . When the back pressure hole is formed in the revolving mirror plate part 221 , it is preferable that the back pressure hole is formed inside (center side) of the second back pressure sealing member 162 .

The revolving wrap 222 is formed on the rear surface of the revolving head plate 221 to engage the fixed wrap 212 . Accordingly, the rear surface of the revolving mirror plate 221 forms a compression chamber V together with the revolving wrap 222 . The compression chamber V is formed such that the suction pressure chamber V1, the intermediate pressure chamber V2, and the discharge pressure chamber V3 are continuously connected from the outside to the inside.

The revolving wrap 222 is integrally formed to extend from the rear surface of the revolving mirror plate 221 . Like the fixed wrap 212 described above, the orbiting wrap 222 may be formed in various ways depending on the shape of the compressor, such as an involute shape, a logarithmic spiral shape, or a non-involute shape. In this regard, as in the case of the fixed wrap, a detailed description thereof will be omitted.

In addition, a boss portion 223 is formed in the center of the front surface of the turning mirror plate portion 221 , and a turning bearing 153 is inserted into the boss portion 223 and coupled thereto. A balance weight 331 is coupled to the orbiting bearing 153 , and the rotation shaft 33 is eccentrically coupled to the balance weight 331 . Accordingly, the rotational force of the motor unit 30 is transmitted to the orbiting scroll 22 through the rotation shaft 33 . The slewing bearing 153 may be a ball bearing such as a main bearing.

Next, the motor part is demonstrated.

The motor unit 30 is accommodated together with the compression unit 20 in the motor chamber S1 of the main housing 11 , and the compression unit 20 provides power for compressing the refrigerant. The motor unit 30 may be operated by power applied from the inverter unit 40 and controlled by a control signal. The motor unit 30 is electrically connected to the inverter unit 40 by the energizing unit 45 .

1 and 2 , the motor unit 30 according to the present embodiment includes a stator 31 and a rotor 32 . The stator is fixed to the main housing 11 , and the rotor 32 is rotatably disposed inside the stator.

The stator 31 includes a stator core 311 , a winding coil 312 , and a coil insulating member 313 . The stator core 311 is fixed to the inner circumferential surface of the main housing 11 , the winding coil 312 is wound on the stator core 311 , and the coil insulating member 313 includes the stator core 311 and the winding coil 312 . provided between

The stator core 311 is formed in a cylindrical shape by stacking a plurality of thin electrical steel sheets in an axial direction. Accordingly, the stator core 311 is formed in a hollow shape, and the rotor accommodating part 311a is provided at the center. The rotor 32 is rotatably inserted into the rotor receiving portion 311a.

In addition, a plurality of teeth are formed on the inner circumferential surface of the stator core 311 in the circumferential direction, and slits are respectively formed between the teeth. A three-phase coil is wound on the teeth in a centralized winding or a distributed winding to form a winding coil 312 .

The rotor 32 includes a rotor core 321 and a permanent magnet 322 .

The rotor core 321 is formed by laminating a plurality of thin electrical steel sheets in an annular shape like the stator core 311 in the axial direction. The rotor core 321 is formed in a hollow shape, and the rotation shaft coupling part 321a is formed in the center.

A plurality of permanent magnets 322 are embedded and coupled around the rotation shaft coupling portion 321a, and a magnetic path barrier (not shown) is formed around the center of the permanent magnet 322 or around the end of the permanent magnet 322 . Accordingly, the rotor 32 is rotated by the electromagnetic field formed by the winding coil 312 of the stator 31 when power is applied from the inverter unit 40 .

The rotating shaft 33 mechanically connects between the compression unit 20 and the motor unit 30 , and transmits the rotational force generated by the motor unit 30 to the compression unit 20 .

The rotating shaft 33 is coupled to the rotating shaft coupling portion 321a of the rotor 32 by hot pressing. Depending on the shape of the compressor, both ends of the rotating shaft 33 may be supported with the motor unit 30 interposed therebetween, or one end of the rotating shaft 33 may be supported from one side of the motor unit 30 . The former may be referred to as a support structure at both ends, and the latter may be referred to as a one-step support structure. This embodiment will be mainly described with the support structure at both ends.

Referring to FIG. 2 , one end of the rotating shaft 33 is supported by the main bearing 151 provided in the frame part 111 , and the other end of the rotating shaft 33 is supported by a sub-bearing provided in the inverter housing 41 ( 152). The rotating shaft 33 is radially and axially supported by the main bearing 151 and radially supported by the sub bearing 152 .

Next, the inverter part will be described.

The inverter unit 40 controls the operation of the electric compressor 10 by applying or releasing power and a control signal to the motor unit 30 . The inverter unit 40 receives power and control signals from the outside and transmits them to the motor unit 30 . Accordingly, the inverter unit 40 is electrically connected to the motor unit 30 .

The inverter unit 40 may be installed on the front side of the main housing 11 . However, the inverter unit 40 is not necessarily installed only on the front side of the main housing 11 . For example, the inverter unit 40 may be installed on the side of the main housing 11 . However, in this embodiment, an example in which the inverter unit is installed on the front side of the main housing will be mainly described.

In addition, the inverter unit 40 may be formed of an insulating material. For example, a member constituting the exterior of the inverter unit 40 may be formed of synthetic resin or the like to prevent unnecessary energization with the outside and noise of the control signal.

However, when the front end of the main housing 11 to be described later is opened, the inverter housing 41 covers the front end of the main housing 11 to form a part of the housing 10 . Therefore, in this case, the inverter housing 41 is preferably formed of the same metal material as the main housing 11 in terms of heat dissipation and strength of the inverter unit.

The inverter unit 40 according to the present embodiment includes an inverter housing 41 , an inverter cover 42 , and a control unit 43 .

The inverter housing 41 is coupled to the inverter cover 42 to form an exterior of the inverter unit 40 . The inverter housing 41 is coupled to the front side of the main housing 11 . As the front side of the main housing 11 is opened, the inverter housing 41 covers the front side of the main housing 11 . Accordingly, the front surface of the inverter housing 41 forms the inverter chamber S4 , and the rear surface of the inverter housing 41 forms the motor chamber S1 .

In addition, a rotating shaft support part 411 is provided in the center of the rear surface of the inverter housing 41 facing the motor unit 30 , and the rotating shaft support part 411 has a sub bearing supporting the front end of the rotating shaft 33 in a radial direction. 152 is inserted and fixed. The sub bearing 152 is made of a ball bearing like the main bearing 151 , and may be coupled by slidingly inserted into the rotation shaft 33 in consideration of the assembly order of the compressor.

In other words, the main bearing 151 is press-fitted to the rotary shaft 33 and fixed to the rotary shaft 33 , while the sub bearing 152 is slidably inserted into the rotary shaft 33 and rotatably coupled to the rotary shaft 33 . . Accordingly, the main bearing 151 supports the rotation shaft 33 in the radial and axial directions, while the sub bearing 152 supports the rotation shaft 33 only in the radial direction.

The inverter cover 42 is coupled to the inverter housing 41 . Accordingly, the inverter cover 42 forms an inverter chamber between the inverter housing 41 and the control unit 43 is accommodated in the inverter chamber.

The control unit 43 is electrically connected to the communication connector 441 and the power connector 442 provided in the inverter housing 41 . Accordingly, the control unit 43 receives power and a control signal for driving the motor unit 30 , and this signal is transmitted to the motor unit 30 through the energizing unit 45 .

The control unit 43 according to the present embodiment is coupled to or supported by a printed circuit board (PCB) 431 , an electronic device 432 mounted on the printed circuit board 431 , and the inverter housing 41 , the printed circuit board and an electrical component 433 connected to 431 .

The electronic device 432 includes a fixed resistor, a diode, a driver, and the like, and the electrical component 433 includes a transistor (or a power semiconductor device, IGBT), a capacitor, an inductor, and the like. The electronic device 432 and the electrical component 433 may be collectively referred to as an inverter component for convenience. Of course, these electronic devices and electrical parts also include parts necessary for general control of the compressor in addition to inverter control, but for convenience of description, they are collectively referred to as inverter parts.

Next, the injection unit will be described.

The injection unit 50 may be described including a refrigeration cycle, and may be limited to a compressor. For example, when the injection unit 50 includes a refrigeration cycle (particularly, a heat pump refrigeration cycle), an injection pipe and an injection pipe branched from the condenser outlet and connected to the compressor are branched, or injection It may include a gas-liquid separator (not shown) provided in the middle of the tube to separate the gas refrigerant and the liquid refrigerant from the refrigerant. Since this is a technique known in a typical injection refrigeration cycle, a detailed description thereof will be omitted.

On the other hand, when the injection unit 50 is limited to the compressor, the injection tube 51 and the gas-liquid separator (not shown) may be excluded and limited to the internal structure of the compressor to which the injection tube is connected. Hereinafter, the injection unit will be described by limiting to the latter compressor.

4 is an enlarged cross-sectional view of part "A" of FIG. 3, and FIGS. 5A and 5B are cross-sectional views of "III-III" of FIG. 4, showing embodiments of the end surface of the pipe connection protrusion, 6 is an exploded perspective view of the fixed scroll and the rear housing in FIG. 1 , FIG. 7 is a plan view showing the coupling state of the fixed scroll and the rear housing in FIG. 6 , and FIG. 8 is a plan view showing the exterior of the rear housing in FIG. , FIG. 9 is a plan view showing the inside of the rear housing in FIG. 8, FIG. 10 is a cross-sectional view of FIG. .

1 to 3 again, the injection unit 50 according to this embodiment is connected to the injection passage 50a connected to the injection tube (unsigned) and the injection passage 50a connected to the compression chamber V. and a communicating injection hole 211d.

The injection passage 50a is formed in the rear housing 12 , and the injection hole 211d is formed in the fixed head plate 211 facing the rear housing 12 . Since the injection hole 211d has been previously described with the fixed head plate 211 in the fixed scroll 21, the following description will be focused on the injection passage 50a.

The injection passage 50a according to the present embodiment is formed in the housing rear portion 121 through the housing side portion 122 of the rear housing 12 . However, when the inner wall member (not shown) is coupled to the housing rear portion 121 of the rear housing 12 , the injection passage 50a is formed between the housing rear portion 121 of the rear housing 12 and the inner wall member (not shown). It may be formed in, it may be formed inside the inner wall member (not shown). Even in these cases, the structure of the injection passage 50a may be the same as or substantially similar to that of the case formed in the housing rear portion 121 of the rear housing 12 . Therefore, hereinafter, an example in which the injection passage 50a is formed in the housing rear portion 121 of the rear housing 12 will be mainly described.

3 to 5B, the above-described pipe connection protrusion 124 is formed on the housing side part 122 of the rear housing 12 according to the present embodiment, and a discharge pipe is formed on the end surface of the pipe connection protrusion 124. A connection groove (124a) and an injection pipe connection groove (124b) are formed. The discharge pipe connection groove 124a penetrates the housing side part 122 and communicates with the discharge space S2, and the injection pipe connection groove 124b penetrates the housing side part 122 and is connected to the injection passage 50a.

The pipe connection protrusion 124 is formed to extend radially from the outer circumferential surface of the housing side part 122 . Accordingly, the pipe connection protrusion 124 protrudes from the outer peripheral surfaces (or fastening protrusions) of the main housing 11 and the rear housing 12 to easily fasten the pipe assembly block 60 to be described later to the pipe connection protrusion 124 . can do.

In addition, as shown in FIGS. 5A and 5B , the pipe connection protrusion 124 is formed in a rectangular or elliptical cross-sectional shape, and the cross-sectional shape of the pipe connection protrusion 124 may be formed to extend long in the axial direction. Accordingly, while forming the discharge pipe connection groove 124a and the injection pipe connection groove 124b in the pipe connection protrusion 124 in parallel in the radial direction, the length in the circumferential direction with respect to the cross section of the pipe connection protrusion 124 is minimized. can

Through this, the distance between the bolt fastening hole 122b for fastening the main housing 11 and the rear housing 12 can be properly maintained. However, the cross-sectional shape of the pipe connection protrusion 124 is not necessarily formed to extend in the axial direction. As described above, the cross-sectional shape of the pipe connection protrusion 124 may be formed to extend in the circumferential direction or may be formed in an inclined direction between the axial direction and the circumferential direction. Hereinafter, an example in which the pipe connection protrusion is formed to extend long in the axial direction will be first described as a representative example.

The pipe connection protrusion 124 according to the present embodiment is formed long in the axial direction, and a discharge pipe connection groove 124a communicating with the exhaust port 123 is provided on the front side, and the injection communicating with the injection chamber 511a to be described later on the rear side. Pipe connection grooves (124b) are respectively formed.

In addition, a pipe connection fastening groove 124c is formed on the opposite side of the discharge pipe connection groove 124a around the injection pipe connection groove 124b. A fastening bolt 65 passing through a pipe connection fastening hole 63 of a pipe connection block 60 to be described later is fastened to the pipe connection fastening groove 124c, so that the pipe connecting block 60 is attached to the pipe connection protrusion 124. is concluded Accordingly, the discharge pipe DP and the injection pipe IP can be easily communicated with the exhaust port 123 and the injection passage 50a, respectively, so that the pipe connection work can be simplified.

In addition, the pipe connection fastening groove 124c may be formed only on one side of the pipe connection protrusion 124 . In this case, it may be advantageous for miniaturization of the compressor by minimizing the number of fastening bolts. However, in some cases, the pipe connection fastening grooves 124c may be respectively formed on both sides of the pipe connection protrusion 124 in the longitudinal direction or on both sides in the width direction. When the pipe connection fastening groove 124c is formed on both sides of the longitudinal direction or both sides of the width direction of the pipe connection protrusion 124, the discharge pipe DP and the injection pipe IP can be stably coupled.

On the other hand, the discharge pipe connection groove (124a) is formed to penetrate through the housing side portion 122 in a radial direction, and the injection tube connection groove (124b) is formed to penetrate through the housing side portion (122) in a radial direction. Accordingly, the discharge pipe connection groove (124a) and the injection pipe connection groove (124b) may be formed to be spaced apart in the axial direction and parallel to the radial direction.

In addition, the discharge pipe connection groove (124a) and the injection pipe connection groove (124b) may be formed independently, respectively, may be formed collectively. For example, as shown in FIG. 5A , a discharge pipe connection groove 124a may be formed at an end of the exhaust port 123 , and an injection pipe connection groove 124b may be formed at an end of the injection chamber 511a , respectively.

In this case, the discharge pipe connection groove (124a) and the injection pipe connection groove (124b) are each formed in an annular shape, the inner diameter of the discharge pipe connection groove (124a) is formed larger than the inner diameter of the exhaust port 123, the injection pipe connection groove The inner diameter of the 124b may be larger than the inner diameter of the injection chamber 511a.

An annular discharge pipe sealing member 125a is inserted into the discharge pipe connection groove 124a, and an annular injection pipe sealing member 125b is inserted into the injection pipe connection groove 124b. Accordingly, when the pipe connection block 60 is fastened to the pipe connection protrusion 124 , the end surface of the discharge pipe DP coupled to the pipe connection block 60 is in close contact with the discharge pipe sealing member 125a to the exhaust port It is sealed between (123) and the discharge pipe (DP).

In addition, when the pipe connection block 60 is fastened to the pipe connection protrusion 124 , the end surface of the injection pipe IP coupled to the pipe connection block 60 is in close contact with the injection pipe sealing member 125b to the injection chamber It is sealed between the (511a) and the injection pipe (IP).

At this time, when the respective sealing members 125a and 125b are inserted into the respective connection grooves 124a and 124b, between the discharge pipe DP and the exhaust port 123 and the injection pipe IP and the injection chamber ( 511a) can be more tightly sealed.

On the other hand, the discharge pipe (DP) and the injection pipe (IP) are inserted and coupled to the pipe connection block (60), the pipe connection block (60) is bolted to the pipe connection protrusion (124). For example, the pipe connection block 60 is formed long in the axial direction to correspond to the pipe connection protrusion 124 , and the pipe connection block 60 has a discharge pipe insertion hole 61 , an injection pipe insertion hole 62 , and a pipe connection. A fastening hole 63 is formed.

The discharge pipe insertion hole 61 corresponds to the discharge pipe connection groove 124a, the injection pipe insertion hole 62 corresponds to the injection pipe connection groove 124b, and the pipe connection fastening hole 63 is the pipe connection fastening groove 124c. ) is matched with Accordingly, the discharge pipe DP inserted into and coupled to the discharge pipe insertion hole 61 is inserted into the discharge pipe connection groove 124a to communicate with the exhaust port 123, and the injection pipe inserted and coupled to the injection insertion hole 124b (IP) is inserted into the injection connection groove (124b) is in communication with the injection passage (50a).

Then, the discharge space S2 of the rear housing 12 directly communicates with the condenser (not shown) of the refrigeration cycle through the exhaust port 123 and the discharge pipe DP, and the refrigerant discharged to the discharge space S2 is the After the oil is separated from the discharge space S2, it moves to the condenser of the refrigeration cycle through the exhaust port 123 and the discharge pipe DP.

In addition, the compression chamber (intermediate pressure chamber) V communicates with a gas-liquid separator (not shown) through the injection pipe IP and the injection passage 50a, and the medium pressure refrigerant separated from the gas-liquid separator, etc. is injected through the injection passage 50a. It can be supplied to the compression chamber (intermediate pressure chamber) (V) through the.

As described above, when the discharge pipe (DP) and the injection pipe (IP) are respectively connected to the exhaust port 123 and the injection passageway (50a) using a pair of pipe connection protrusions 124 and the pipe connection block 60, By reducing the number of parts and assembling man-hours for connecting the discharge pipe (DP) and the injection pipe (IP), it is possible to lighten the compressor and lower the manufacturing cost. In addition, it is possible to simplify the piping structure around the compressor by unifying the assembly of the discharge pipe and the injection pipe, thereby reducing the space occupied by the compressor including the pipe, thereby reducing the size of the compressor.

Meanwhile, the discharge pipe connection groove 124a and the injection pipe connection groove 124b may be collectively formed at the end of the exhaust port 123 and the end of the injection chamber 511a. For example, as shown in FIG. 5B , one pipe connection groove 124d is formed so that the end of the exhaust port 123 and the end of the injection chamber 511a communicate with each other, and one pipe sealing member is formed in the pipe connection groove 124d. (125c) may be inserted.

Accordingly, the exhaust port 123 and the injection chamber 511a communicate with the pipe connection groove 124d, and the exhaust hole (unsigned) communicates with the exhaust port 123 and the injection chamber 511a through the pipe sealing member 125c. And the injection hole (unsigned) is formed to penetrate so as to communicate with the exhaust port 123 and the injection chamber (511a), respectively. That is, the pipe connection groove 124d and the pipe sealing member 125c are formed to correspond to each other.

As described above, when one pipe sealing member 125c is inserted into one pipe connection groove 124d, one sealing member is used between the discharge pipe DP and the exhaust port 123 and the injection pipe IP ) and the injection chamber (511a) can each be sealed, so that it is possible to facilitate the processing of the pipe connection groove (124d) and the assembly of the pipe sealing member (125c).

Although not shown in the drawings, the discharge pipe and the injection pipe may be connected to each other. For example, the discharge pipe and the injection pipe may be formed as a single pipe, and a plurality of pipes may be formed therein. The plurality of conduits may include a discharge hole constituting the discharge pipe and an injection hole constituting the injection pipe.

On the other hand, the injection protrusion 51 is formed in the housing rear portion 121 of the rear housing 12 according to the present embodiment. The injection protrusion 51 is formed to protrude in a substantially circular cross-sectional shape from the inner surface or the outer surface of the housing rear surface portion 121 during side projection. However, considering that the discharge pipe connection groove 124a is formed on the front side of the injection passage (injection pipe connection groove) 50a, the injection protrusion 51 has a height that protrudes to the rear side rather than a height that projects forward as much as possible. It may be desirable to form high. Accordingly, while the discharge pipe connection groove 124a and the injection pipe connection groove 124b are arranged along the axial direction, it is possible to maintain an appropriate volume while suppressing an excessive increase in the volume of the discharge space S2.

In addition, since the injection protrusion 51 is formed in a range overlapping the discharge port 211b in the radial direction, it is formed to face the discharge valve assembly 25 in the axial direction. However, the injection protrusion 51 is formed at a height that does not interfere with the discharge valve assembly 25 in the axial direction.

In addition, the injection passage (50a) described above is formed through the inside of the injection protrusion (51). For example, the injection protrusion 51 is a plurality of main injection protrusions 511 in which an injection chamber 511a to be described later is formed, a first injection port 512a1 and a second injection port 512b1 to be described later are formed, respectively. It includes sub-injection protrusions 512a and 512b.

6 and 8 , the main injection protrusion 511 is formed to extend radially from the inner surface 122a of the housing side portion 122 . Accordingly, the injection protrusion 51 may improve the rigidity of the rear housing 12 while serving as a kind of rigid rib.

The main injection protrusion 511 may be formed at a position overlapping the axial center line of the discharge port 211b. Accordingly, the refrigerant discharged through the discharge port 211b collides with the main injection protrusion 511 as well as the retainer, so that the oil separation effect due to the collision can be improved. In particular, as the main injection protrusion 511 is formed to protrude, the gap between the discharge port 211b and the main injection protrusion 511 is narrowed. As a result, the refrigerant discharged through the discharge port 211b strongly collides with the main injection protrusion 511, thereby further improving the oil separation effect.

6 and 8 , the plurality of sub injection protrusions 512a and 512b extend in the axial direction from the outer circumferential surface of the main injection protrusions 511 , respectively. The plurality of sub-injection protrusions 512a and 512b are respectively formed at predetermined intervals on both sides along the longitudinal direction of the main injection protrusions 511 . Hereinafter, the sub-injection protrusion located close to the injection pipe connection groove 124b, which is the inlet of the injection chamber 511a, is referred to as the first sub-injection protrusion 512a, and the sub-injection protrusion located far away from the injection pipe connection groove 124b is referred to as the second sub-injection protrusion 512b. define.

In addition, referring to FIG. 3 , the first sub-injection protrusion 512a and the second sub-injection protrusion 512b are respectively closely attached to and coupled to the rear surface (rear surface) of the fixed end plate 211 . Accordingly, the first injection port 512a1 and the second injection port 512b1, which will be described later, communicate independently with the first injection hole 211da and the second injection hole 211d2, respectively. At this time, a sealing member such as an O-ring is inserted into the front end surface of each of the sub-injection protrusions 512a and 512b, and between the respective sub-injection protrusions 512a and 512b and the fixed head plate 211. can be tightly sealed. Accordingly, it is possible to suppress the refrigerant having the discharge pressure from flowing into the injection passage 50a.

9 and 10 , an injection chamber 511a is formed in the main injection protrusion 511, a first injection port 512a1 is provided in the first sub-injection protrusion 512a, and a second sub injection protrusion 512b. ), a second injection port 512b1 is formed, respectively. One end of the first injection port 512a1 and the second injection port 512b1 communicates with the injection chamber 511a, respectively. That is, the injection passage 50a according to the present embodiment communicates with the injection chamber 511a and the injection chamber 511a forming the inlet of the injection passage 50a, and a plurality of injection ports forming the outlet of the injection passage 50a. (512a1) (512b1).

The injection chamber 511a and the plurality of injection ports 512a1 and 512b1 are formed to be separated with respect to the discharge chamber S2 and the exhaust port 123, respectively, and the injection chamber 511a is located in the injection pipe (IP), the plurality of The injection ports 512a1 and 512b1 communicate with the plurality of injection holes 211d1 and 211d2, respectively. Accordingly, the refrigerant of the discharge pressure discharged to the discharge chamber S2 moves to the inlet side of the condenser through the exhaust port 123, and the refrigerant passing through the condenser forms an intermediate pressure between the suction pressure and the discharge pressure, and the outlet side of the condenser is injected into each intermediate pressure chamber (V2) through the injection pipe (IP).

Here, one end of the injection chamber 511a is formed as an open end to communicate with the injection pipe connection groove 124b provided in the housing side part 122 of the rear housing 12 , and the other end of the injection chamber 511a is a discharge chamber. (S2) is formed as a closed closed end inside of. As described above, the injection pipe connection groove 124b has an outer periphery opening to connect the injection pipe IP.

On the other hand, the injection chamber (511a) is made of a single passage from the open end to the closed end, and may be formed to be elongated in the radial direction with a phase difference of approximately 45° from the exhaust port 123 . In this case, the first injection port 512a1 and the second injection port 512b1 are respectively located on both sides of the injection chamber 511a in the longitudinal direction with respect to the longitudinal centerline of the injection chamber 511a. That is, the first injection port 512a1 and the second injection port 512b1 are formed to communicate with the injection chamber 511a at positions spaced apart by a predetermined distance in the diagonal direction of the injection chamber 511a.

Accordingly, the first injection port 512a1 and the second injection port 512b1 are formed with a phase difference of approximately 180° with the discharge port 211b as the center. This is the same for the first injection hole 211d1 and the second injection hole 211d2. Accordingly, the first injection port 512a1 and the second injection port 512b1 have different compression pockets (first compression chamber, second compression chamber) by the first injection hole 211d1 and the second injection hole 211d2. ) are connected to each.

Here, the first injection port 512a1 may be formed on the same axis as the first sub injection protrusion 512a, and the second injection port 512b1 may be formed on the same axis as the second sub injection protrusion 512b1. have. Then, the first injection port 512a1 and the second injection port 512b1 are formed in a direction perpendicular to the injection chamber 511a.

However, when the first injection port 512a1 and the second injection port 512b1 are formed in a direction orthogonal to the injection chamber 511a, the inner diameter (cross-sectional area) of the injection chamber 511a increases and the body size increases. will increase That is, the position of the first injection hole 211d1 and the position of the second injection hole 211d2 are determined, and accordingly, the position of the first injection port 512a1 and the position of the second injection port 512b1 are also determined. . When the position of the first injection port 512a1 and the position of the second injection port 512b1 are determined, the interval between the two injection ports 512a1 and 512b1 is determined.

At this time, when the injection chamber 511a is positioned across the first injection port 512a1 and the second injection port 512b1, the first injection port 512a1 and the second injection port 512b1 are connected to the injection chamber ( In order to communicate orthogonally to the 511a, the inner diameter of the injection chamber 511a must be at least greater than the interval between the first injection port 512a1 and the second injection port 512b1. However, when the injection valve 53 to be described later is located on the inlet side of the injection chamber 511a, the internal space of the injection chamber 511a formed on the downstream side than the injection valve 53 is a dead volume. becomes this Since this causes the efficiency of the compressor to decrease, it is desirable to minimize the inner diameter (volume) of the injection chamber 511a as much as possible. In addition, as the inner diameter of the injection chamber 511a decreases, the volume of the discharge chamber S2 increases accordingly, which is advantageous in reducing the pressure pulsation of the discharged refrigerant.

Accordingly, in the present embodiment, the first injection port 512a1 and the second injection port 512b1 are formed to be inclined with respect to the injection chamber 511a. Accordingly, the interval between the first injection port 512a1 and the second injection port 512b1 is formed to become narrower toward the injection chamber 511a, thereby minimizing the inner diameter of the injection chamber 511a.

That is, referring to FIGS. 11A and 11B , the inner diameter D1 of the injection chamber 511a is larger than the inner diameter D21 of the first injection port 512a1 and the inner diameter D22 of the second injection port 512b1. do.

However, the first injection port 512a1 and the second injection port 512b1 are formed to be inclined in a direction widening toward the exit. Accordingly, the inner diameter D1 of the injection chamber 511a is greater than the distance L1 between the inlet ends of the first injection port 512a1 and the second injection port 512b1, but the first injection port 512a1 and the second It is formed smaller than the interval L2 between the exit ends of the injection port (512b1).

Then, while minimizing the inner diameter of the injection chamber 511a, the first injection port 512a1 and the second injection port 512b1 can be communicated with the injection chamber 511a, respectively, and through this, the first injection port 512a1 and the second injection port 512b1 can be connected to the inlet of the injection chamber 511a. It is possible to suppress the increase of the dead volume by the injection chamber (511a) while installing the common injection valve (53).

In addition, as described above, the inner diameter D1 of the injection chamber 511a is larger than the inner diameter D21 of the first injection port 512a1 or the inner diameter D22 of the second injection port 512b1. For example, the inner diameter D1 of the injection chamber 511a may be greater than or equal to the inner diameter of a circular cross-sectional area obtained by adding the first injection port 512a1 and the second injection port 512b1.

Accordingly, even if a plurality of injection ports (512a1) (512b1) communicate with one injection chamber (511a), the refrigerant passing through the injection chamber (511a) each injection port (512a1) (512b1) and each injection hole It can be smoothly injected into each of the intermediate pressure chambers V2 and V2 through the 211d1 and 211d2.

Meanwhile, an injection valve 53 may be installed in the injection passage 50a according to the present embodiment. The injection valve 53 serves to block a reverse flow of the refrigerant injected into the compression chamber V or the refrigerant compressed in the compression chamber V into the injection pipe IP. Accordingly, the injection valve 53 may be a one-way check valve.

As shown in FIG. 10 , one injection valve 53 may be installed on the inlet side of the injection chamber 511a. As the injection valve 53 is installed on the upstream side of the first injection port 512a1 and the second injection port 512b1, while using one injection valve 53, the first injection port 512a1 and the second injection port It is possible to suppress a reverse flow of the refrigerant from the intermediate pressure chamber V2 to the discharge chamber S2 through the port 512b1.

On the other hand, as described above, the main injection protrusion 511 according to the present embodiment is formed to protrude as much as a predetermined height from the inner surface of the housing rear part 121, and the outer circumferential surface of the main injection protrusion 511 is the outlet ( 211b). Accordingly, the refrigerant discharged from the discharge port 211b strongly collides with the main injection protrusion 511 to enhance the oil separation effect in the discharge chamber S2.

Furthermore, a flow path guide for guiding the refrigerant discharged to the discharge chamber S2 toward the exhaust port 123 may be formed on the inner surface of the rear housing 12 according to the present embodiment. Through this, it is possible to guide the refrigerant in the discharge chamber S2 to be rapidly discharged to the exhaust port 123 , and to suppress remixing of the refrigerant and oil in the discharge chamber S2 . 12 is a perspective view showing another embodiment of the rear housing, and FIG. 13 is a plan view of FIG. 12 .

12 and 13 , a flow path guide 126 is formed on the outer peripheral surface of the main injection protrusion 511 according to the present embodiment. The flow guide 126 may be formed in a U-shape when projected in the axial direction.

For example, the flow path guide 126 is formed at a position in which the discharge valve part 251a for opening and closing the discharge port 211b and the discharge retainer part 252a are accommodated, and the opening side of the flow path guide 126 is the exhaust port. It may be formed to face (123). Accordingly, the discharge port 211b is blocked in the axial direction by the housing rear portion (precisely, including the outer peripheral surface of the main injection protrusion) 121 in the axial direction, and at the same time, the discharge port 211b is partially blocked in the radial direction by the flow path guide 126 .

Then, the refrigerant discharged from the compression chamber V to the discharge chamber S2 passes through the discharge port 211b and collides with the discharge retainer part 252a or the main injection protrusion 511, and the oil is separated from the refrigerant. The separated refrigerant moves rapidly toward the exhaust port 123 along the flow path guide 126, and the separated oil flows down along the inner surface of the rear housing 12 or the outer surface of the fixed scroll 21 to the discharge chamber ( S2) is moved to the lower side. Accordingly, it is possible to suppress the refrigerant from stagnation in the discharge chamber (S2) to suppress remixing of the refrigerant and oil in the discharge chamber (S2), through which the oil is discharged to the outside of the compressor together with the refrigerant. Oil spillage can be reduced. In addition, as the refrigerant in the discharge chamber S2 is rapidly discharged, the pressure pulsation in the discharge chamber S2 is reduced to lower the compressor vibration.

Meanwhile, in the discharge chamber S2 according to the present embodiment, the interior of the discharge chamber S2 is divided into a plurality of spaces to separate and store oil from the refrigerant, and the oil separated from the refrigerant is re-contacted with the refrigerant. It is possible to reduce the remixing rate between the refrigerant and the oil in the discharge chamber (S2) by suppressing it.

For example, referring to FIGS. 3 and 12 , a first partition protrusion 127 may be formed in the rear housing 12 to connect the inner surfaces 122a of the housing side portions 122 facing each other to each other. The first compartment protrusion 127 may be formed to transversely cross the discharge chamber S2 so that the first space S21 and the second space S22 can be vertically partitioned.

The first space S21 is a space in which the discharge port 211b is accommodated and forms an oil separation space, and the second space S22 forms an oil storage space to store the oil separated in the oil separation space. Even if the height of the first compartment protrusion 127 is formed lower than the height of the housing side portion 122 or the same as the height of the housing side unit 122, the oil passage groove (not shown) on the front end surface of the first compartment protrusion 127 ) can be formed.

Accordingly, an oil movement gap t is formed between the front end surface of the first partition protrusion 127 and the rear surface of the fixed head plate 211 facing it. Then, the oil separated from the refrigerant in the first space (S21), which is the oil separation space, can smoothly move to the second space (S22), which is the oil storage space, over the first partitioning protrusion (127).

Here, the second partition protrusion 215 may also be formed in the fixed end plate 211 in which the distal end surface of the first partition protrusion 127 faces. The second compartment protrusion 215 is formed at a height spaced apart by a predetermined distance from the inner surface of the housing rear portion 121 of the rear housing 12, and the front end surface thereof has a first compartment protrusion 127 and a second compartment protrusion ( 215 may be alternately formed along the radial direction so as to overlap in the axial direction.

Then, as shown in FIG. 11b , the first compartment protrusion 127 and the second compartment protrusion 215 form an oil movement gap t of a zigzag shape with the surfaces facing each other. Through this, it is possible to effectively suppress the reverse flow or reverse movement of the oil stored in the second space S22 to the first space S21.

In addition, the first compartment protrusion 127 may serve as a kind of reinforcing rib for reinforcing the rigidity of the rear housing 12 and the second compartment protrusion 215 may respectively reinforce the rigidity of the fixed scroll 21 .

Furthermore, the first partition protrusion 127 may be formed to be connected to the main injection protrusion 511 or the sub-injection protrusion 512a and 512b. In this case, the rigidity of the first compartment protrusion 127 is increased, and accordingly, the rigidity of the rear housing 12 may be further improved.

On the other hand, another embodiment of the injection valve for opening and closing the injection passage is as follows. That is, in the above embodiment, one injection valve is provided on the inlet side of the injection passage, but in this embodiment, the injection valve is installed on the outlet side of the injection passage, respectively.

14 is a cross-sectional view showing another example of the injection valve.

Referring to FIG. 14 , a first injection valve 531 is installed between the first injection port 512a1 and the first injection hole 211d1 , and the second injection port 512b1 and the second injection hole 211d2 are provided. A second injection valve 532 may be installed between the

For example, each of the first injection valve 531 and the second injection valve 532 may be a ball valve. In this case, the first injection valve 531 and the second injection valve 532 are installed as close as possible to the first injection hole 211d1 and the second injection hole 211d2 as much as possible, or the first injection hole 211d1 And it is preferable to install the second injection hole (211d2) in the interior of the injection passage (50a) to reduce the body volume.

As described above, when the first injection valve 531 and the second injection valve 532 are installed in the first injection port 512a1 and the second injection port 512b1, respectively, as in the above-described embodiment, the Compared to the inlet side where the injection valve is installed, the distance between the compression chamber V and the injection valve 53 is shortened, and the volume between the compression chamber V and the injection valve 53 is reduced by that much. Then, the amount of residual refrigerant in the injection passage 50a, which may be generated when the compressor is stopped, is reduced, and consequently, the dead volume is reduced, and the compression efficiency can be improved.

On the other hand, another embodiment of the injection passage is as follows.

That is, in the above embodiment, the first injection port and the second injection port are formed to be inclined to communicate with the injection chamber, but in this embodiment, the first injection port and the second injection port are formed in parallel in the axial direction to form the injection chamber will be connected to

15 is a plan view of the rear housing showing another embodiment of the injection passage, and FIG. 16 is a cross-sectional view of FIG. 15 .

15 and 16 , the injection chamber 511a according to the present embodiment is formed to overlap the first injection port 512a1 and the second injection port 512b1 in the axial direction. That is, the first injection port 512a1 and the second injection port 512b1 are formed to be positioned on the longitudinal centerline of the injection chamber 511a.

Accordingly, the first sub-injection protrusion 512a and the second sub-injection protrusion 512b are positioned on the longitudinal center line of the main injection protrusion 511 and extend in the axial direction, and the first injection port 512a1 and The second injection ports 512b1 may be respectively formed in the axial direction to communicate with the injection chamber 511a.

In this case, the main injection protrusion 511 provided with the injection chamber 511a may be formed to be slightly inclined with respect to the first partition protrusion 127 . However, this is only for illustrating and explaining the main injection protrusion 511 inclined with respect to the first partition protrusion 127 for comparison with the above-described embodiment, and in fact, the main injection protrusion 511 is the first compartment It may be formed to be perpendicular to the protrusion 127 .

In addition, the exhaust port 123 may be rotated by an angle at which the main injection protrusion 511 is inclined, and in some cases, as long as it does not interfere with the bolt fastening hole 122b, it may be formed at the same position as in the above-described embodiment. can This is described by taking as an example the case where the positions of the injection holes 211d1 and 211d2 are the same as in the above-described embodiments. Accordingly, when the positions of the injection holes 211d1 and 211d2 are changed, the main injection protrusion 511 may be formed perpendicular to or parallel to the first partition protrusion 127 .

As described above, when the first injection port (512a1) and the second injection port (512b1) are formed to overlap the injection chamber (511a) in the axial direction, the first injection port (512a1) and the second injection port (512b1) Since it can be machined vertically, it can be machined easily.

In addition, compared to that the first injection port 512a1 and the second injection port 512b1 are formed to be inclined, the inner diameter of the injection chamber 511a may be minimized. Accordingly, when the injection valve 53 is installed at the inlet of the injection passage 50a, the dead volume caused by the injection chamber 511a can be reduced.

In addition, as the first injection port 512a1 and the second injection port 512b1 are formed in the axial direction, the length of the injection port becomes shorter. Through this, when the injection valve 53 is installed at the inlet of the injection passage 50a, it is possible to reduce the body volume caused by the injection ports 512a1 and 512b1.

In addition, although not shown in the drawings, only one injection port among the first injection port 512a1 and the second injection port 512b1 is formed to communicate with the injection chamber in the axial direction, and the other injection port is connected to the injection chamber in the axial direction. It may be formed so as to be inclined to communicate.

On the other hand, another embodiment of the injection passage is as follows.

That is, in the above embodiment, only one injection chamber is formed, but in this embodiment, a plurality of injection chambers are formed to correspond to each injection port one-to-one.

17 is a plan view of the rear housing showing another embodiment of the injection passage, FIG. 18 is a cross-sectional view of FIG. 17, and FIG. 19 is an enlarged cross-sectional view of part "B" of FIG. VI-VI" is a front cross-sectional view, and FIG. 21 is a cross-sectional view showing another example of the injection chamber in FIG.

17 and 18 , in this embodiment, a first injection chamber 511a1 and a second injection chamber 511a2 are formed, and a first injection port 512a1 is provided in the first injection chamber 511a1, A second injection port 512b1 is formed to be connected to the second injection chamber 511a2, respectively.

The first injection chamber 511a1 and the second injection chamber 511a2 may be formed to have the same length. However, based on the injection pipe connection groove 124b, which is the inlet of the injection passage 50a, the first injection port 512a1 is located closer than the second injection port 512b1, so the first injection chamber 511a1 ) and the length of the second injection chamber 511a2 do not need to be formed to be the same.

In this case, from the perspective of the first injection port 512a1 , the first injection chamber 511a1 extending past the first injection port 512a1 becomes a corpse. On the other hand, from the perspective of the second injection port 512b1, the first injection chamber 511a1 extending past the first injection port 512a1 is not a corpse, but a necessary injection passage.

Accordingly, when the first injection chamber 511a1 and the second injection chamber 511a2 are formed to have different lengths, the injection chamber may be removed from an unnecessary portion, thereby reducing the body volume caused by the injection chamber. For example, as shown in FIG. 18 , the length L3 of the first injection chamber 511a1 may be shorter than the length L4 of the second injection chamber 511a2 . That is, the first injection chamber 511a1 may be formed only up to the first injection port 512a1 , and the second injection chamber 511a2 may be formed to extend to the second injection port 512b1 . Then, an unnecessary volume may be removed from the first injection chamber 511a1 , thereby reducing the dead volume due to the overall injection chamber 511a.

In addition, the inner diameter D11 of the first injection chamber 511a1 and the inner diameter D12 of the second injection chamber 511a2 are smaller than the inner diameter of the injection chamber 511a according to the embodiment of FIGS. 9 and 10 , respectively. can be formed. Accordingly, the dead volume due to the injection chamber 511a can be further reduced.

Also, as shown in FIGS. 19 and 20 , the inner diameter D11 of the first injection chamber 511a1 and the inner diameter D12 of the second injection chamber 511a2 may be formed to be the same as each other. In this case, processing of the first injection chamber 511a1 and the second injection chamber 511a2 may be facilitated.

Also, the inner diameter D11 of the first injection chamber 511a1 and the inner diameter D12 of the second injection chamber 511a2 may be formed to be different from each other. That is, as shown in FIG. 21 , the inner diameter D12 of the second injection chamber 511a2 may be larger than the inner diameter D11 of the first injection chamber 511a1 . In this case, the refrigerant flow amount of the second injection chamber 511b1 located relatively far from the injection pipe connection groove 124b, which is the inlet of the injection passage 50a, may be compensated.

For example, as the length L3 of the first injection chamber 511a1 is shorter than the length L4 of the second injection chamber 511a2, the flow resistance in the second injection chamber 511a2 is the first The flow resistance in the injection chamber 511a1 may be greater than the flow resistance. Then, the refrigerant injection amount in the second injection port (512b1) is relatively lower than the refrigerant injection amount of the first injection port (512a1), or the refrigerant injection time in the second injection port (512b1) is the first injection port (512a1) It may be delayed from the time of refrigerant injection. Then, a pressure difference in both compression chambers can be generated.

However, if the inner diameter D12 of the second injection chamber 511a2 is larger than the inner diameter D11 of the first injection chamber 511a1 as in this embodiment, flow resistance in both injection chambers 511a1 and 511a2 As this becomes similar, the amount of refrigerant injected into both injection ports 512a1 and 512b1 and the injection timing can be properly balanced. Through this, it is possible to suppress the pressure difference between the two compression chambers that may occur due to refrigerant injection.

Also, referring to FIG. 20 , the inner diameter D11 of the first injection chamber 511a1 is greater than or equal to the inner diameter D21 of the first injection port 512a1, and the inner diameter D11 of the second injection chamber 511a2 ( D12) may be formed to be greater than or equal to the inner diameter D22 of the second injection port 512b1. However, since the first injection chamber 511a1 and the second injection chamber 511a2 are the inlets on the movement path of the refrigerant, the inner diameters D11 and D12 of each injection chamber 511a1 and 511a2 are each injection port. (512a1) (512b1) may be preferably formed larger than the inner diameter (D21) (D22). Accordingly, the medium-pressure refrigerant may move to each of the injection ports 512a1 and 512b1 without being decompressed in the first injection chamber 511a1 and the second injection chamber 511a2 .

Meanwhile, in the above-described embodiment, the first injection port and the second injection port are formed to be inclined, but in some cases, the first injection port and the second injection port may be formed parallel to the axial direction.

22 is a plan view showing another embodiment of the injection passage in FIG. 18 .

Referring to FIG. 22 , the first injection chamber 511a1 and the second injection chamber 511a2 according to the present embodiment are formed along the transverse direction. A first injection port 512a1 may communicate with the first injection chamber 511a1 , and a second injection port 512b1 may communicate with the second injection chamber 511a2 .

Here, the first injection port 512a1 and the second injection port 512b1 may be formed in parallel in the axial direction. In this case, the first injection chamber 511a1 and the second injection chamber 511a2 may be formed to partially overlap as shown in FIG. 17 . However, considering the position of the first injection port 512a1 and the position of the second injection port 512b1, the first injection chamber 511a1 and the second injection chamber 511a2 are horizontally spaced apart as shown in FIG. may be formed.

In this case, the first sub-injection protrusion 512a and the second sub-injection protrusion 512b may be respectively formed on both sides of the main injection protrusion 511 in the lateral direction.

As described above, when the first injection port 512a1 and the second injection port 512b1 are formed parallel to the axial direction, the basic configuration and effects thereof are similar to those of the embodiment of FIG. 16 described above. However, in this embodiment, as the first injection chamber 511a1 and the second injection chamber 511a2 are arranged to be horizontally spaced apart, the first injection port 512a1 and the second injection port 512b1 are positioned in the axial direction. It is possible to reduce the body volume due to the first injection port 512a1 and the second injection port 512b1 while being formed parallel to each other.

Meanwhile, in the above-described embodiment, the first injection chamber and the second injection chamber are arranged in the transverse direction, but in some cases, the first injection chamber and the second injection chamber may be arranged in the longitudinal direction (axial direction).

23 is a plan view showing another embodiment of the injection passage in FIG. 18, FIG. 24 is a sectional view "VII-VII" of FIG. 23, and FIG. 25 is another embodiment of the injection passage in FIG. It is a plan view, and FIG. 26 is a front sectional view "VIII-VIII" of FIG.

23 and 25 , the first injection chamber 511a1 and the second injection chamber 511a2 according to the present embodiments are arranged along the axial direction. For example, the first injection chamber 511a1 may be located on the front side close to the compression unit 20 , and the second injection chamber 511a2 may be located on the rear side of the first injection chamber 511a1 , respectively.

In addition, the first injection port 512a1 and the second injection port 512b1 may be formed to be inclined, respectively, or may be formed in the axial direction. For example, as shown in FIG. 24 , the first sub-injection protrusion 512a and the second sub-injection protrusion 512b may be respectively formed on both sides of the main injection protrusion 511 . Then, the first injection port 512a1 may be formed to communicate obliquely toward the first injection chamber 511a1, and the second injection port 512b1 may be formed to communicate obliquely toward the second sub injection chamber 512b1. .

Alternatively, as shown in FIG. 26 , the first sub-injection protrusion 512a and the second sub-injection protrusion 512b overlap the main injection protrusion 511 , that is, the main injection protrusion 511 is located on the longitudinal center line. can be formed to Then, the first injection port 512a1 is formed to communicate in the axial direction toward the first injection chamber 511a1, and the second injection port 512b1 is formed to communicate in the axial direction toward the second injection chamber 511b1. can be

Here, the first injection chamber 511a1 and the second injection chamber 511a2 may be formed to partially overlap each other in the axial direction. However, in some cases, the first injection chamber 511a1 and the second injection chamber 511a2 may be formed to be spaced apart from each other in the axial direction.

As described above, even when the first injection chamber 511a1 and the second injection chamber 511a2 are arranged along the axial direction, the inner diameter D11 of the first injection chamber 511a1 and the second injection chamber 511a2 The inner diameter D12 may be formed to be the same as each other, or may be formed to be different from each other. The basic configuration and the effects thereof will be replaced with the description of the embodiment of FIG. 22 above. However, in this embodiment, as the first injection chamber 511a1 is arranged to be closer to the compression part than the second injection chamber 511a2, the length of the first injection port 512a1 may be shortened. Then, if there is one injection valve 53 at the inlet of the injection passage 50a, it is possible to reduce the dead volume due to the injection port. In addition, it is possible to increase the oil separation effect by bringing the injection protrusion 51 closer to the discharge port 211b.

Meanwhile, as described above, only one injection valve 53 may be installed on the inlet side of the injection passage 50a, or a plurality of injection valves 53 may be installed on the outlet side of the injection passage 50a. For example, when only one injection valve is installed at the inlet of the injection passage 50a, the valve receiving groove 53a in which the injection valve 53 is installed is successively formed in the injection pipe connection groove 124b. The first injection chamber 511a1 and the second injection chamber 511a2 are sequentially formed in the groove 53a to communicate with each other.

In addition, when the injection valve 53 is installed on the outlet side of the injection passage 50a, it is the same as the embodiment of FIG. 14 described above, and thus a description thereof will be omitted. In addition, the flow path guide 126 as in the embodiment of Fig. 12 may be formed on the outer peripheral surface of the main injection protrusion 511, the first compartment protrusion 127 and the first partition protrusion as in the embodiment of Figs. Two-compartment protrusions 215 may be respectively formed on the rear housing 12 and the fixed scroll 21 .

On the other hand, the case of another embodiment of the pipe connection part is as follows.

That is, in the above-described embodiments, the pipe connection protrusion may be extended along the axial direction, but the pipe connection protrusion may be formed to extend along the circumferential direction.

27 is a perspective view of the rear housing showing another embodiment of the pipe connection part, FIG. 28 is a plan view of FIG. 27, and FIG. 29 is a front sectional view of "IX-IX" of FIG.

In the above-described embodiments, the pipe connection part is described by taking the case where the injection path is straight as an example, but in this embodiment, the pipe connection part is described by taking the case where the injection path is curved as an example. However, even when the injection passage is formed in a straight line as in the above-described embodiments, the pipe connecting portion may be formed to extend in the circumferential direction as in the present embodiment.

27 to 29 , the injection passage 50a according to the present embodiment is an injection protrusion 51 extending to have a predetermined height on the inner surface 121a of the housing rear portion 121 of the rear housing 12 . is formed in an arc shape, and the arc-shaped injection chamber 511a is recessed by a predetermined depth in the front surface of the injection protrusion 51 may be formed.

Here, the front surface of the injection chamber 511a is opened, and the opening surface of the injection chamber 511a is in close contact with the rear surface of the fixed head plate part 211 to seal the injection chamber 511a.

An injection sealing groove 512c is formed in the front end surface of the injection protrusion 51 so that an injection sealing member 515 such as an O-ring or a gasket can be inserted along the circumference of the injection chamber 511a. Accordingly, it is possible to effectively suppress the refrigerant from the discharge chamber S2 forming the discharge pressure from flowing into the injection chamber 511a forming the intermediate pressure.

In addition, the depth (D3) of the injection chamber (511a) may be formed to be shallower than the height (H) of the injection protrusion (51). Accordingly, even if one injection valve 53 is installed on the inlet side of the injection chamber 511a (for example, between the injection pipe connection groove 124b and the injection chamber 511a to be described later), the injection chamber 511a body volume can be reduced by

However, the injection valve 53 may be separately installed in each injection hole. In this case, the dead volume generated in the injection chamber 511a can be further reduced by independently opening and closing both injection holes 211d using the plurality of injection valves 53 .

In addition, the pipe connection protrusion 124 described above is formed on the outer circumferential surface of the rear housing 12 . The pipe connection protrusion 124 is formed with a discharge pipe connection groove 124a and an injection pipe connection groove 124b. The discharge pipe connection groove 124a communicates between the discharge pipe DP and the discharge chamber S2, and the injection pipe connection groove 124b communicates between the injection pipe IP and the intermediate pressure chamber V2.

In addition, the pipe connection protrusion 124 extends so as to protrude from the outer peripheral surface of the housing side part 122 in the radial direction, and is formed to extend long in the circumferential direction. Accordingly, the discharge pipe connection groove (124a) and the injection pipe connection groove (124b) may be formed in parallel with a predetermined interval along the circumferential direction.

In addition, an exhaust port 123 communicating with the discharge pipe connection groove 124a is formed in the housing side portion 122 of the rear housing 12 in a radial direction. The exhaust port 123 may be formed to the inside of the inner peripheral surface of the injection protrusion 51 through the housing side portion 122. However, when the exhaust port 123 crosses both ends of the injection protrusion 51 and extends only to the inner circumferential surface of the injection protrusion 51, the distance between the discharge port 211b and the exhaust port 123 is short and in the discharge chamber (S2). Refrigerant and oil may not be sufficiently separated.

Accordingly, the exhaust port 123 may extend across one end of the injection protrusion 51 to pass through the inner peripheral surface of the injection protrusion 51 and then pass through the other end of the injection protrusion 51 . In addition, a plurality of communication holes 123a may be formed in the middle of the main wall surface of the exhaust port 123 , that is, the housing rear portion 121 belonging to the inner peripheral surface of the injection protrusion 51 . The communication hole 123a is a passage for communicating the inner space of the discharge chamber S2 with the inner space of the exhaust port 123 (that is, the oil separation space).

In this case, an oil separation space S21 is formed inside the exhaust port 123 , an oil separator 128 for centrifugal separation is installed in the oil separation space S21 , and an oil separation space is provided at the other end of the exhaust port 123 . An oil drain hole (123b) for guiding the oil separated in (S21) to the oil storage space (S22) may be formed. At the other end of the injection protrusion 51, a first partition protrusion 127 connecting the injection protrusion 51 and the housing side part 122 is extended, so that the oil storage space S22 is formed at the lower side of the discharge chamber S2. can do.

Meanwhile, the injection protrusion 51 may be formed in a semicircular arc shape to surround the discharge port 211b and the bypass hole 211c. Accordingly, the refrigerant in the compression chamber V is discharged to the discharge chamber S2 through the discharge port 211b and the bypass hole 211c, and the refrigerant flows along the inner circumferential surface of the injection protrusion 51 and the communication hole 123a ) may be guided to the oil separation space S21 of the exhaust port 123 .

Then, the refrigerant is separated from oil in the oil separation space S21 formed inside the exhaust port 123, and the refrigerant from which the oil is separated is the condenser of the refrigeration cycle device through the discharge pipe connection groove 124a and the discharge pipe DP. On the other hand, the gas oil separated from the refrigerant is recovered to the oil storage space S22 through the oil drain hole 123b.

The basic configuration of the pipe connection protrusion and the injection passage communicating with the pipe connection protrusion according to the present embodiment and the effect thereof are similar to those of the above-described embodiments. Therefore, a detailed description thereof will be omitted. However, in this embodiment, as the injection passage serves as a kind of flow guide as described above, there is no need to form a separate flow guide. Accordingly, the processing of the rear housing with respect to the flow guide may be facilitated.

In addition, as the discharge pipe connection groove 124a and the injection pipe connection groove 124b are formed in the circumferential direction in the pipe connection protrusion 124, the axial height of the pipe connection protrusion 124 is lower than that of the above-described embodiment. will lose Accordingly, while the discharge pipe connection groove 124a and the injection pipe connection groove 124b are formed in one pipe connection protrusion 124, the length of the compressor is suppressed from becoming longer, thereby ensuring compactness and weight reduction of the compressor.

Meanwhile, in the above embodiments, the description has been focused on an example in which the rotating shaft is coupled to one side of the orbiting scroll, but the same may be applied to a through-shaft scroll compressor in which the rotating shaft passes through the orbiting scroll.

10: housing 11: main housing
111: frame part 111a: bearing part
111b: bearing receiving portion 111c: intermediate pressure space portion
111d: scroll support surface portion 111e: suction through hole
112: intake port 113: scroll fixed surface
113a: bolted groove 12: rear housing
121: housing rear portion 121a: inner surface of the housing rear portion
122: housing side portion 122a: inner surface of the housing side portion
122b: bolt fastening hole 123: exhaust port
123a: communication hole 123b: drain hole
124: pipe connection protrusion 124a: discharge pipe connection groove
124b: injection pipe connection groove 124c: pipe connection fastening groove
124d: pipe connection groove 125a: discharge pipe sealing member
125b: injection pipe sealing member 125c: pipe sealing member
126: euro guide 127: first compartment protrusion
128: oil separator 151: main bearing
152: sub bearing 153: slewing bearing
161: first back pressure sealing member 162: second back pressure sealing member
20: compression unit 21: fixed scroll
211: fixed head plate 211b: outlet
211c: bypass hole 211d: injection hole
211d1: first injection hole 211d2: second injection hole
212: fixed wrap 215: second compartment protrusion
22: orbiting scroll 221: orbiting head plate portion
221a: back pressure sealing groove 222: swivel wrap
223: boss portion 25: valve assembly
251: valve plate 251a: discharge valve part
251b: bypass valve unit 252: retainer
252a: discharge retainer part 252b: bypass retainer part
30: motor 31: stator
311: stator core 311a: rotor receiving part
312: winding coil 313: coil insulation member
32: rotor 321: rotor core
321a: rotation shaft coupling portion 322: permanent magnet
33: axis of rotation 331: balance weight
40: inverter unit 41: inverter housing
411: rotation shaft support 42: inverter cover
43: control unit 431: printed circuit board
432: electronic device 433: electrical parts
45: energizing unit 50: injection unit
50a: injection passage 51: injection protrusion
511: main injection projection 511a: injection chamber
511a1: first injection chamber 511a2: second injection chamber
512a: first sub injection protrusion 512a1: first injection port
512b: second sub injection protrusion 512b1: second injection port
512c: injection sealing groove 515: injection sealing member
52: injection communication groove 53: injection valve
53a: valve receiving groove 531: first injection valve
532: second injection valve 60: pipe connection block
61: discharge pipe insertion port 62: injection pipe insertion port
63: block fastening hole 65: fastening bolt
DP: discharge pipe IP: injection pipe
D1: inner diameter of the first injection chamber D2: inner diameter of the second injection chamber
D21: inner diameter of the first injection port D22: inner diameter of the second injection port
D3: Depth of injection chamber H: Height of injection protrusion
L1: The distance between the outlet end of the injection port L2: The distance between the outlet end of the injection port
L3: Length of the first injection chamber L4: Length of the second injection chamber
S1: Motor room S2: Discharge chamber
S21: first space (oil separation space) S22: second space (oil storage space)
S3: back pressure chamber V: compression chamber
V1: Suction pressure chamber V2: Intermediate pressure chamber
V3: discharge pressure chamber

Claims (18)

Motor part:
a compression unit connected to the motor unit and operated, forming a compression chamber for compressing a refrigerant, and having an injection hole communicating with the compression chamber; and
a rear housing provided on one side of the compression unit and forming a discharge space between the compression unit and the compression unit;
A pipe connection part is formed in the rear housing,
In the pipe connection part,
An electric compressor in which a discharge pipe connection part for connecting the discharge space to the discharge pipe and an injection pipe connection part for connecting the injection hole to the injection pipe are formed. According to claim 1,
The rear housing is
a housing rear portion facing the compression portion and a housing side portion protruding along the circumference from one side of the housing rear portion to form the discharge space,
The pipe connecting portion extends radially from an outer peripheral surface of the housing side portion. 3. The method of claim 2,
A plurality of fastening holes are formed in the rear housing in a circumferential direction, and the pipe connection part is formed between two fastening holes adjacent to each other. According to claim 1,
The discharge pipe connection part and the injection pipe connection part are arranged parallel to each other. According to claim 1,
The discharge pipe connection part and the injection pipe connection part are arranged in an axial direction. 6. The method of claim 5,
The discharge pipe connection part is an electric compressor formed to be adjacent to the compression part than the injection pipe connection part. According to claim 1,
The discharge pipe connection part and the injection pipe connection part are arranged in a circumferential direction. According to claim 1,
A discharge pipe connection groove and an injection pipe connection groove are formed on an end surface of the pipe connection part, and an end of the discharge pipe and an end of the injection pipe are inserted into the discharge pipe connection groove and the injection pipe connection groove to be connected. . 9. The method of claim 8,
A pipe connection block is coupled to the pipe connection part, and the discharge pipe and the injection pipe are inserted and coupled to the pipe connection block. 10. The method of claim 9,
A sealing member is provided between the discharge pipe and the discharge pipe connection groove and between the injection pipe and the injection pipe connection groove, respectively. According to claim 1,
An injection passage is formed between the injection pipe connection part and the injection hole,
The injection passage is
an injection chamber opened toward an outer circumferential surface of the rear housing; and
and an injection port formed in a direction crossing the injection chamber and communicating the injection chamber with the injection hole. 12. The method of claim 11,
One end of the injection chamber passes through the outer circumferential surface of the rear housing, and the other end of the injection chamber is formed to be blocked inside the discharge space,
One end of the injection port communicates with the injection chamber inside the discharge space, and the other end of the injection port is opened toward the compression unit to communicate with the injection hole. 13. The method of claim 12,
A plurality of the injection holes and the injection ports are formed to correspond to each other,
At least one injection port among the plurality of injection ports is provided on one side with respect to the longitudinal centerline of the injection chamber,
At least one injection port from among the plurality of injection ports is formed to be inclined. 13. The method of claim 12,
A plurality of the injection holes and the injection ports are formed to correspond to each other,
The injection chamber is formed to overlap with at least one injection port among the plurality of injection ports when projected in an axial direction. 12. The method of claim 11,
A plurality of the injection holes and the injection ports are formed to correspond to each other,
One injection chamber is formed, and the plurality of injection ports are in communication with the one injection chamber, respectively. 12. The method of claim 11,
A plurality of the injection holes and the injection ports are formed to correspond to each other,
A plurality of injection chambers are formed, and the plurality of injection ports are in one-to-one communication with the plurality of injection chambers, respectively. 17. The method according to any one of claims 11 to 16,
The injection passage is provided with an injection valve for opening and closing the injection passage,
The injection valve is provided on an upstream side of the injection port. 17. The method according to any one of claims 11 to 16,
The injection passage is provided with an injection valve for opening and closing the injection passage,
The injection valve is provided on a downstream side of the injection port.

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