KR102461067B1 - Scroll compressor and air conditioner having this - Google Patents

Abstract

In the scroll compressor and air conditioner having the same according to the present invention, an inner space is divided into a suction space and a discharge space, and the suction space is connected to a suction pipe connected to an evaporator outlet side of the refrigeration cycle device, and the discharge space is a casing to which a discharge pipe connected to the condenser inlet side of the refrigeration cycle device is connected; a main frame coupled to the inside of the casing; a non-orbiting scroll coupled to the main frame and having an inlet and an outlet; an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber; and one end is branched from the refrigerant pipe between the condenser and the evaporator, the other end is connected to the intermediate pressure chamber of the compression chamber through the casing, and at least a portion of a section connected to the intermediate pressure chamber through the casing is the discharge A scroll compressor and an air conditioner having the same may be provided.

Description

Scroll compressor and air conditioner having same

The present invention relates to a scroll compressor and an air conditioner having the same, and more particularly, to a low-pressure scroll compressor having an injection device and an air conditioner having the same.

An air conditioner is a home appliance for maintaining indoor air in an appropriate state according to use and purpose. In such an air conditioner, a refrigeration cycle for performing compression, condensation, expansion, and evaporation of the refrigerant is driven, and accordingly, a cooling or heating operation of an indoor space can be performed. Such an air conditioner may be classified into a separate type air conditioner in which an indoor unit and an outdoor unit are separated from each other, and an integrated air conditioner in which an indoor unit and an outdoor unit are combined into one device, depending on whether the indoor unit and the outdoor unit are separated.

The outdoor unit includes an outdoor heat exchanger exchanging heat with outdoor air, and the indoor unit includes an indoor heat exchanger exchanging heat with indoor air. The air conditioner may be switched to a cooling mode or a heating mode. When the air conditioner is operated in the cooling mode, the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator, respectively. On the other hand, when the air conditioner is operated in the heating mode, the outdoor heat exchanger functions as an evaporator and the indoor heat exchanger functions as a condenser, respectively.

In general, when the outdoor air condition is not good, the cooling or heating performance of the air conditioner may be limited. For example, when the outside temperature of the area where the air conditioner is installed is very high or very low, a sufficient amount of refrigerant circulation must be ensured in order for the air conditioner to obtain desired heating/cooling performance. To this end, when a compressor having a large capacity is provided, there is a problem in that the manufacturing and installation cost of the air conditioner is increased.

In consideration of this, a portion of the refrigerant discharged from the compressor may be bypassed in the middle of the refrigeration cycle and injected into the middle of the compression chamber without increasing the capacity of the compressor. This is called an injection cycle, and an air conditioner to which such an injection cycle is applied and a scroll compressor applied to an air conditioner of this injection cycle type are known.

As is known, in a scroll compressor, a non-orbiting scroll is installed in the inner space of a casing, and the orbiting scroll is engaged with the non-orbiting scroll to perform a orbiting motion, and a suction chamber, an intermediate It is a compressor that forms a pair of compression chambers consisting of a pressure chamber and a discharge chamber.

Scroll compressors are widely used for refrigerant compression in air conditioners, etc. because they can obtain a relatively high compression ratio compared to other types of compressors and achieve stable torque by smoothly connecting refrigerant suction, compression, and discharge strokes.

In addition, the scroll compressor may be classified into a low pressure type and a high pressure type according to the type of refrigerant supplied to the compression chamber. In the low-pressure scroll compressor, the refrigerant is indirectly sucked into the suction chamber through the inner space of the casing, and the inner space of the casing is divided into a suction space and a discharge space. On the other hand, in the high-pressure scroll compressor, refrigerant is directly sucked into the suction chamber without passing through the inner space of the casing and discharged through the inner space of the casing, and most of the inner space of the casing forms the discharge space.

In addition, the scroll compressor may be divided into a tip seal method and a back pressure method according to a sealing method of the compression chamber. The tip seal method is a method in which a tip seal is installed at the tip of the lap of each scroll so that the tip seal floats while the compressor is operating and is in close contact with the head plate of the opposite scroll. On the other hand, in the back pressure method, a back pressure chamber is formed on the rear surface of one scroll and oil or medium pressure refrigerant is induced in the back pressure chamber so that the scroll is pushed by the pressure of the back pressure chamber and closely adheres to the opposite scroll. In general, the tip seal method is applied to a low pressure scroll compressor, while the back pressure method is applied to a high pressure scroll compressor. However, recently, an example in which a back pressure method is applied to a low pressure scroll compressor has been introduced.

1 is a longitudinal cross-sectional view showing an example of a scroll compressor of a conventional injection type.

As shown in this figure, in the conventional injection scroll compressor, a driving motor 20 for generating rotational force is installed in the inner space 11 of the sealed casing 10, and the main frame ( 30) is installed.

A non-orbiting scroll 40 is fixedly installed on the upper surface of the main frame 30, and between the main frame 30 and the non-orbiting scroll 40, the orbiting scroll 50 is pivotable with respect to the non-orbiting scroll 40 installed. The orbiting scroll 50 is eccentrically coupled to a rotating shaft 25 coupled to the rotor 22 of the driving motor 20 .

The casing 10 includes a cylindrical shell 11 having both upper and lower ends open, an upper cap 12 covering the upper end of the cylindrical shell 11, and a lower shell 13 covering the lower end of the cylindrical shell 11. consist of.

A suction pipe 15 communicating with the suction space Vs is connected to the middle height of the cylindrical shell 11, and a discharge pipe 16 communicating with the discharge space Vd is connected to the side of the upper shell 12. .

An injection pipe 17 that is branched between the condenser and the evaporator of the refrigeration cycle is connected to one side of the suction pipe 15 . The injection tube 17 is connected to the inner injection tube 18 connecting the inner peripheral surface of the cylindrical shell 11 and the injection hole 46 to be described later.

The internal injection pipe 18 is disposed in the suction space Vs, which is a low pressure part, by a high and low pressure separating plate 14 in which the inner space of the casing 10 is described later.

In addition, one end of the inner injection tube 18 is connected to the injection tube 17 by welding to a connecting member 19a provided on the inner circumferential surface of the cylindrical shell 11, and the other end of the inner injection tube 18 is a ratio to be described later. It is connected to the injection hole 46 by fastening the gasket 19b to the outer circumferential surface of the orbiting scroll 40 .

The non-orbiting scroll 40 has a head plate 41 formed in a disk shape, a separate high and low pressure separator 14 is coupled to the upper surface of the head plate 41, and the high and low pressure separator 14 is a cylindrical shell. In close contact with the inner circumferential surface of (11), the inner space of the casing (10) is separated into a suction space (Vs) and a discharge space (Vd).

In addition, at the edge of the end plate 41, a side wall portion 42 that protrudes downwardly and is coupled to the main frame 30 is formed in an annular shape, and inside the side wall portion 42 is a revolving wrap of the orbiting scroll 50 ( A non-orbiting wrap 43 forming the compression chamber P together with 52 is formed.

A suction port 44 is formed on one side of the side wall portion 42 , a discharge port 45 is formed near the center of the end plate 41 , and a suction chamber Ps is formed between the suction port 44 and the discharge port 45 . , an intermediate pressure chamber Pm and a compression chamber Pd are formed.

The intermediate pressure chamber Pm has an injection hole 46 penetrating through the head plate 41 of the non-orbiting scroll 40, and the injection hole 46 is formed on the outer peripheral surface of the non-orbiting scroll 40 by the head plate part 41. It is formed to pass through and communicate with the intermediate pressure chamber Pm.

In the drawings, reference numeral 21, which is not described, denotes a stator, 26 denotes a sub-frame, 51 denotes a head plate of the orbiting scroll, 53 denotes a boss to which the rotating shaft is coupled, and 60 denotes an Oldham ring.

In the conventional scroll compressor as described above, when power is applied to the driving motor 20 to generate rotational force, the rotating shaft 25 transmits the rotational force of the driving motor 20 to the orbiting scroll 50 .

Then, while the orbiting scroll 50 orbits with respect to the non-orbiting scroll 40 by the Oldham ring 60, a pair of compression chambers P are formed between the orbiting scroll 40 and the orbiting scroll 50. The refrigerant is sucked, compressed, and discharged.

At this time, the refrigerant discharged from the compressor forms a refrigeration cycle in which the refrigerant is sucked back into the compressor through the condenser-expansion device-evaporator. In the case of the cycle (Vapor Injection cycle), a portion of the refrigerant expanded through the expansion device is branched into the injection pipe 17 before it flows into the evaporator and is injected into the intermediate pressure chamber Pm through the internal injection pipe 18 .

Then, the refrigerant injected into the intermediate pressure chamber Pm through the internal injection pipe 18 and the refrigerant sucked into the suction chamber Ps through the evaporator are combined to increase the circulation amount of the refrigerant.

However, in the scroll compressor applied to the conventional injection refrigeration cycle as described above, the internal injection pipe 18 connecting the injection pipe 17 to the intermediate pressure chamber Pm in the internal space of the casing 10 is a suction space ( Vs), there is a limit in increasing the degree of superheat of the refrigerant injected into the intermediate pressure chamber Pm through the internal injection tube 18. Accordingly, the liquid refrigerant that has not yet evaporated may remain in the injected refrigerant and may flow into the intermediate pressure chamber Pm, thereby reducing compression efficiency as well as damage to wraps constituting the compression chamber.

In addition, as the inner injection pipe 18 is connected between the casing 10 and the non-orbiting scroll 40, the non-orbiting scroll 40 moves in the axial direction, that is, in the case of the back pressure method, the internal injection pipe ( 18) and the internal injection pipe 18 may be welded to a fine crack may occur, which may cause refrigerant leakage.

In addition, the vibration noise of the compressor can be further increased because the vibration of the compressor is excited by the internal injection pipe 18 or transmitted to the casing 10 through the internal injection pipe 18 .

In addition, many parts are needed to connect the internal injection pipe 18, and this causes the assembly process to be difficult, thereby increasing the manufacturing cost.

An object of the present invention is to provide a scroll compressor capable of preventing the liquid refrigerant from being injected into the compression chamber in advance by increasing the degree of superheat of the refrigerant injected into the compression chamber through an injection tube, and an air conditioner having the same.

Another object of the present invention is to provide a scroll compressor capable of preventing leakage of refrigerant from an injection flow path including an injection pipe even when the non-orbiting scroll moves in the axial direction, and an air conditioner having the same.

Another object of the present invention is to provide a scroll compressor capable of preventing aggravation of compressor vibration due to an injection flow path in advance, and an air conditioner having the same.

Another object of the present invention is to provide a scroll compressor capable of reducing manufacturing cost by simplifying an injection flow path and an air conditioner having the same.

In order to achieve the object of the present invention, the inner space is divided into a suction space and a discharge space, the suction space is connected to a suction pipe connected to an evaporator outlet side of the refrigeration cycle device, and the discharge space is a condenser of the refrigeration cycle device a casing to which a discharge pipe connected to the inlet is connected; a main frame coupled to the inside of the casing; a non-orbiting scroll coupled to the main frame and having an inlet and an outlet; an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber; and one end is branched from the refrigerant pipe between the condenser and the evaporator, the other end is connected to the intermediate pressure chamber of the compression chamber through the casing, and at least a portion of a section connected to the intermediate pressure chamber through the casing is the discharge A scroll compressor comprising a; an injection unit that exchanges heat with the refrigerant in the space may be provided.

Here, the injection unit, one end is branched in the refrigerant pipe between the condenser and the evaporator, the other end is an injection pipe coupled through the casing; and an injection passage connected to the other end of the injection pipe and communicating with the intermediate pressure chamber through the inside of the main frame and the inside of the non-orbiting scroll.

In addition, the injection flow passage is formed through the main frame, the frame side flow passage to which the injection tube is connected to one end; and a scroll-side flow path formed through the non-orbiting scroll, one end communicating with the frame-side flow path and the other end communicating with the intermediate pressure chamber.

In addition, the injection flow passage is formed through the main frame, the frame side flow passage to which the injection tube is connected to one end; a scroll-side flow passage formed through the non-orbiting scroll and having one end communicating with the intermediate pressure chamber; and a connection pipe connected between the frame-side flow path and the scroll-side flow path and positioned inside the discharge space from the outside of the non-orbiting scroll.

Here, a sealing part may be provided at a position where the frame-side flow path and the scroll-side flow path meet.

And, on one side of the main frame and one side of the non-orbiting scroll opposite to the one side of the main frame, a frame side sealing groove and a scroll side sealing groove each having a predetermined depth are formed to face each other, and the frame A sealing tube communicating with the frame-side passage and the scroll-side passage is inserted into the side sealing groove and the scroll-side sealing groove, and the sealing tube may overlap a surface where the main frame and the non-orbiting scroll meet in the axial direction.

A sealing member may be provided between the outer circumferential surface of the sealing tube and the inner circumferential surface of each sealing groove.

In addition, the inner space of the casing may be separated into the suction space and the discharge space by the main frame or the non-orbiting scroll, and one end of the injection passage may be connected to the injection pipe through the outer circumferential surface of the main frame.

Here, the injection unit, one end is branched in the refrigerant pipe between the condenser and the evaporator, the other end is an injection pipe coupled through the casing; and an injection passage connected to the other end of the injection pipe, passing through the inside of the non-orbiting scroll, and communicating with the intermediate pressure chamber.

And, the outer circumferential surface of the non-orbiting scroll is in close contact with the inner circumferential surface of the casing, the inner space of the casing is separated into the suction space and the discharge space, and one end of the injection flow passage passes through the non-orbiting scroll to the suction space may be connected to the injection tube in the region.

Here, the injection unit may include: an external injection pipe having one end branched from the refrigerant pipe between the condenser and the evaporator and the other end coupled through the casing; and an internal injection pipe having one end connected to the other end of the external injection pipe and the other end communicating with the intermediate pressure chamber, wherein the internal injection pipe may be located outside the non-orbiting scroll and inside the discharge space have.

And, the casing is further provided with a high and low pressure separating plate separating the suction space and the discharge space, one end of the inner injection tube communicates with the external injection tube in the suction space region, and the other end of the inner injection tube is the It may be coupled to the non-orbiting scroll in the discharge space region through the high and low pressure separator.

In addition, in order to achieve the object of the present invention, the inner space is separated into a suction space and a discharge space, the suction space is connected to a suction pipe connected to the outlet side of the evaporator of the refrigerating cycle, the discharge space is the condenser of the refrigerating cycle a casing to which a discharge pipe connected to the inlet is connected; a main frame coupled to the inside of the casing; a non-orbiting scroll coupled to the main frame and having an inlet and an outlet; an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber; an injection pipe branched from the refrigerant pipe between the condenser and the evaporator; and an injection passage having one end connected to the injection pipe in the suction space area and the other end connected to the intermediate pressure chamber in the discharge space area.

Here, the injection flow path may be formed to continuously penetrate the main frame and the non-orbiting scroll.

Here, the injection flow path may be formed through the non-orbiting scroll.

Here, the injection flow path may be formed by forming a first flow path and a second flow path passing through the main frame and the non-orbiting scroll, respectively, and connecting the first flow path and the second flow path with a connecting pipe.

Here, the injection flow path further includes an internal injection pipe communicating with the injection pipe inside the casing and positioned in the discharge space area, and a flow path communicating with the internal injection pipe and communicating with the intermediate pressure chamber is divided into the ratio It can be formed on orbiting scrolls.

Meanwhile, an air conditioner including the above-described scroll compressor may be included.

In the scroll compressor and air conditioner having the same according to the present invention, at least a part of the injection flow path that communicates the injection pipe branched from the refrigeration cycle to the intermediate pressure chamber of the compression chamber is installed in a relatively high temperature discharge space among the inner space of the casing of the compressor Accordingly, it is possible to secure the degree of superheat of the injection refrigerant passing through the injection flow path, and through this, even if some liquid refrigerant remains in the injected refrigerant, the liquid refrigerant is vaporized by the refrigerant in the discharge space and the liquid refrigerant is prevented from flowing into the compression chamber. It is possible to improve the performance of the compressor by preventing it, and at the same time, it is possible to improve reliability by preventing damage to both wraps constituting the compression chamber.

In addition, as the injection pipe and the injection flow path are connected in the main frame, which is a fixed member, even if the non-orbiting scroll moves in the axial direction as in the case of the back pressure method, the entrance of the injection flow path does not move, so the injection pipe and the injection flow path are connected. It is possible to prevent cracks in the area in advance, and through this, the reliability of the air conditioner including the compressor can be increased.

In addition, since the injection flow path is formed inside the main frame and the non-orbiting scroll, or even if installed outside the non-orbiting scroll, the length of the injection flow path is formed to be minimally short. have.

In addition, by welding and connecting the injection pipe and the injection flow path, not only the connection structure of the injection pipe and the injection flow path is simplified, but also the structure of the injection flow path can be simplified to lower the manufacturing cost.

1 is a longitudinal sectional view showing an example of a scroll compressor of a conventional injection type;
2 is a system schematic diagram showing the configuration of an air conditioner according to an embodiment of the present invention;
3 is a cross-sectional view showing an embodiment of an internal heat exchanger in the air conditioner according to FIG. 2;
4 is a PH diagram showing a change in refrigerant physical properties according to the operation of the air conditioner according to an embodiment of the present invention;
5 is a longitudinal cross-sectional view showing an embodiment of an injection-type scroll compressor according to the present invention;
6 is a longitudinal cross-sectional view showing an injection flow path in the scroll compressor according to FIG. 5;
7 and 8 are longitudinal cross-sectional views illustrating embodiments of a sealing part between the frame side flow path and the scroll side flow path in the injection flow path of the scroll compressor according to FIG. 5;
9 to 11 are longitudinal cross-sectional views respectively showing other embodiments of the injection flow path in the injection type scroll compressor according to the present invention.

Hereinafter, an injection type scroll compressor and an air conditioner having the same according to the present invention will be described in detail based on an embodiment shown in the accompanying drawings.

2 is a system schematic diagram showing the configuration of an air conditioner according to an embodiment of the present invention, FIG. 3 is a cross-sectional view showing an embodiment of an internal heat exchanger in the air conditioner according to FIG. 2 , and FIG. 4 is a diagram of the present invention It is a P-H diagram showing the change of refrigerant physical properties according to the operation of the air conditioner according to the embodiment.

Referring to FIG. 2 , a refrigeration cycle in which a refrigerant circulates is driven in the air conditioner according to the embodiment of the present invention. The air conditioner according to the present embodiment may perform a cooling or heating operation according to a circulation direction of a refrigerant.

The air conditioner includes a compressor (1) for compressing the refrigerant, a condenser (2) for condensing the refrigerant compressed in the compressor (1), and a first expansion for selectively expanding the refrigerant condensed in the condenser (2) The device 3a and the second expansion device 3b, the evaporator 4 for allowing the refrigerant expanded in the first expansion device 3a and the second expansion device 3b to evaporate, and the first expansion device 3a and the injection expansion device 5 for re-expanding a part of the refrigerant expanded in the primary expansion device 3 by branching between the second expansion device 3b, and the refrigerant re-expanded in the injection expansion device 5 A refrigeration cycle including an injection heat exchanger 6 for exchanging heat with the refrigerant expanded in the first expansion device 3 is provided. The compressor 1, the condenser 2, the first expansion device 3a and the second expansion device 3b, the evaporator 4, the injection expansion device 5, and the injection heat exchanger 6 control the flow of the refrigerant. It is connected by a refrigerant pipe (L) to guide, and among them, the injection expansion device (5) and the injection heat exchanger (6) are connected to the injection pipe (117) to form an injection cycle.

When the air conditioner performs a cooling operation, the outdoor heat exchanger may function as a condenser and the indoor heat exchanger may function as an evaporator. On the other hand, when the air conditioner performs a heating operation, the indoor heat exchanger may function as a condenser and the outdoor heat exchanger may function as an evaporator.

The compressor 1 is configured to be capable of multi-stage compression, and may include a scroll compressor configured to compress the refrigerant by a relative phase difference between a non-orbiting scroll and an orbiting scroll, which will be described later. A description related to the compressor 1 will be described later. The condenser 2, the first expansion device 3a, the second expansion device 3b, and the evaporator 4 are commonly known components and a detailed description thereof will be omitted. However, the injection expansion device 5 is made of a valve that can adjust the opening degree to control the flow rate of the refrigerant, the injection heat exchanger 6 can be applied to a double tube heat exchanger.

3, in the injection heat exchanger 6, the inlet of the outer tube 6a is connected to the outlet of the first expansion device 3a, and the outlet of the outer tube 6a is the inlet of the second expansion device 3b. can be connected with In addition, the inlet of the inner tube 6b of the injection heat exchanger 6 is connected to the outlet of the injection expansion device 5, and the outlet of the inner tube 6b is connected to the injection passage Li of the compressor 1 to be described later. can

Accordingly, the liquid refrigerant that has been primarily expanded while passing through the first expansion device 3a flows into the outer tube 6a, and the refrigerant is branched while moving to the second expansion device (or evaporator) 3b. It is bypassed to the refrigerant pipe and passes through the injection expansion device (5). The refrigerant passing through the injection expansion device 5 is secondarily expanded in the injection expansion device 5, and the liquid refrigerant and the gas refrigerant are mixed.

The liquid refrigerant and gas refrigerant passing through the injection expansion device (5) flow into the inner tube (6b) of the injection heat exchanger (6), and the liquid refrigerant and gas refrigerant flowing into the inner tube (6b) are transferred to the outer tube (6a). ), absorbs heat from the refrigerant in the outer tube 6a through heat exchange with the primary expanded high-temperature refrigerant of lead to (Li).

A pressure-enthalpy diagram (P-H diagram) of the refrigerant system circulating in the air conditioner will be described with reference to FIGS. 2 and 4 .

That is, the refrigerant (state A) sucked into the compressor 1 is compressed in the compressor 1 and mixed with the refrigerant injected into the compressor 1 through the injection flow path Li. The mixed refrigerant shows the state of B. The process in which the refrigerant is compressed from the A state to the B state is called "one-stage compression".

The refrigerant in the B state is compressed again, and this refrigerant is in the C state. The process in which the refrigerant is compressed from the B state to the C state is called "two-stage compression". Then, the refrigerant is discharged in the state of C and flows into the condenser 2 , and when discharged from the condenser 2 , it represents the state of D.

The refrigerant that has passed through the condenser 2 is “primarily expanded” through the first expansion device 3a to become a D state, and this primary expanded refrigerant passes through the outer tube 6a of the injection heat exchanger 6 After cooling, most of the refrigerant (circulating refrigerant) moves in the direction of the second expansion device, while some refrigerant (injection refrigerant) is bypassed to the injection tube 117 . At this time, the circulating refrigerant is heat-exchanged with the injection refrigerant passing through the inner tube 6b of the injection heat exchanger 6 while passing through the outer tube 6a of the injection heat exchanger 6 to be recondensed to the E state. called "condensation". On the other hand, the injection refrigerant is "injection-expanded" through the injection expansion device 5 to become a G state, and then passes through the inner tube 6b of the injection heat exchanger 6 and "injection evaporates" to secure the superheat.

The circulating refrigerant passing through the second expansion device (3b) passes through the evaporator (4) and becomes a state A, and a series of processes of being sucked into the compressor (1) are repeated.

On the other hand, the compressor applied to the refrigeration cycle according to the present invention is as follows. 5 is a longitudinal cross-sectional view showing an embodiment of an injection-type scroll compressor according to the present invention, FIG. 6 is a longitudinal cross-sectional view showing an injection flow path in the scroll compressor according to FIG. 5, and FIGS. 7 and 8 are shown in FIG. It is a longitudinal cross-sectional view showing embodiments of the sealing part between the frame side flow path and the scroll side flow path in the injection flow path of the scroll compressor according to the present invention.

As shown in FIG. 5 , in the scroll compressor 1 according to the present embodiment, the inner space of the casing 110 is a suction space Vs that is a low pressure part and a discharge space Vd that is a high pressure part by the non-orbiting scroll 140 . ) can be distinguished. A suction pipe 115 connected to the evaporator outlet of the refrigerating cycle may be connected to the suction space Vs, and a discharge pipe 116 connected to the condenser inlet of the refrigerating cycle may be connected to the discharge space Vd to communicate with each other.

The casing 110 may include a cylindrical shell 111 having both ends open in the axial direction, and an upper shell 112 and a lower shell 113 covering both open ends of the cylindrical shell 111 .

A driving motor 120 for generating rotational force is installed inside the cylindrical shell 111 , and the main frame 130 may be fixedly installed above the driving motor 120 .

In addition, as the cylindrical shell 111 is supported by the support protrusion 131 of the main frame 120 placed on the upper end thereof, the upper end of the cylindrical shell 111 may be formed lower than the bottom height of the non-orbiting scroll 140 . have.

In addition, an injection tube connection hole 111a is formed around the upper end of the cylindrical shell 111 so that an injection tube 117 to be described later can be inserted and coupled, and the injection tube 117 is formed in the injection tube connection hole 111a. The intermediate member 111b may be coupled for welding between the cylindrical shell 111 and the cylindrical shell 111 . As a result, as the injection pipe 117 communicates with the suction space Vs at which the pressure sits relatively, it is possible to reduce the possibility that the refrigerant leaks due to the pressure difference.

The non-orbiting scroll 140 may be installed on the upper surface of the main frame 130 , and the orbiting scroll 150 may be pivotably installed between the main frame 130 and the non-orbiting scroll 140 .

The main frame 130 is formed with a support protrusion 131 supported by being placed on the upper end of the cylindrical shell 111 on its upper outer circumferential surface, and the side wall portion of the non-orbiting scroll 140 to be described later on the upper edge of the main frame 130 . A support surface 132 on which the 142 is supported is formed, and an Oldham ring seating groove 133 into which the Oldham ring 160 is inserted is formed inside the support surface 132 , and A thrust surface 134 on which the head plate 151 of the orbiting scroll 150, which will be described later, is supported in the axial direction, is formed inside the thrust surface 134, and a boss part 153 of the orbiting scroll 150, which will be described later, is formed inside the thrust surface 134. ) may be formed with a turning space portion 135 to make a turning motion. A shaft hole 136 for radially supporting the rotation shaft 125 may be formed in the center of the revolving space 135 .

In addition, the main frame 130 is formed with a plurality of support protrusions 137 that protrude in the radial direction along the circumferential direction and whose outer peripheral surface is in close contact with the inner peripheral surface of the cylindrical shell 111 , and any of the plurality of support protrusions 137 . An injection pipe 117 to be described later communicates with one of the support protrusions to form a frame-side flow path 138 constituting an injection flow path.

The frame-side flow path 138 may be formed to a predetermined depth in the radial direction and then be formed through the support surface 132 of the main frame 130 in the axial direction. As shown in FIG. 7 , a first sealing groove 138a having a predetermined depth may be formed at the exit end of the frame-side flow path 138 so that a sealing tube 170 to be described later can be inserted.

Meanwhile, in the non-orbiting scroll 140 , the head plate 141 may be formed in a disk shape. The end plate 141 of the non-orbiting scroll has an outer circumferential surface in close contact with the inner circumferential surface of the upper shell 112 to separate the inner space of the casing 110 into a suction space Vs and a discharge space Vd. Accordingly, with the non-orbiting scroll 140 interposed therebetween, the lower space of the non-orbiting scroll 140 , that is, the space in which the driving motor 120 is installed, is the suction space Vs, the non-orbiting scroll 140 . The upper space forms a discharge space Vd.

In addition, the non-orbiting scroll 140 has a side wall portion 142 that protrudes toward the main frame 130 on the edge of the bottom surface of the end plate portion 141 and is coupled to the main frame 130 is formed, and the side wall portion 142 is formed. The non-orbiting wrap 143 is engaged with the orbiting wrap 152 of the orbiting scroll 150 to be described later to form a compression chamber P composed of a suction chamber (Ps), an intermediate pressure chamber (Pm), and a discharge chamber (Pd) on the inside of the can be formed. A tip seal 144 is inserted along the non-orbiting wrap 143 at the upper end of the non-orbiting wrap 143 .

In addition, a suction groove (not shown) communicating between the suction space Vs and the suction chamber Ps is formed on one side of the sidewall 142 of the non-orbiting scroll 140 , and a discharge chamber is formed at the center of the head plate 141 . A discharge port 145 for communicating Pd and the discharge space Vd may be formed.

Meanwhile, in the non-orbiting scroll 140 , the scroll-side flow path 146 communicates with the frame side flow path 138 of the main frame 130 and guides the refrigerant bypassed through the injection pipe 117 to the intermediate pressure chamber Pm. ) can be formed.

The scroll-side flow path 146 includes a first flow path 147 formed on the side wall portion 142 and communicating with the outlet of the frame-side flow path 138 , and the first flow path 147 in a radial direction (or a direction close to the discharge port). ) formed at a predetermined interval and may include a second flow path 148 communicating with the intermediate pressure chamber Pm, and a third flow path 149 connecting between the first flow path 147 and the second flow path 148 . have.

The first flow path 147 may be formed to have a predetermined axial length such that one end (inlet) passes toward the frame side flow path 138 and the other end does not pass through the end plate portion 141 . In addition, the first flow path 147 may be formed in the axial direction to have the same inner diameter as the frame side flow path 138 so as to be concentric with the frame side flow path 138 . And, as shown in FIG. 7 , a second sealing groove 147a may be formed at one end of the first flow path 147 to correspond to the first sealing groove 138a of the frame side flow path 138 . The depth of the first sealing groove 138a and the second sealing groove 147a is formed to be less than half of the axial length of the sealing tube 170, respectively.

Accordingly, when the sealing tube 170 is inserted into the first sealing groove 138a and the second sealing groove 147a, the sealing tube 170 corresponds to the support surface 132 of the main frame 130 and corresponding thereto. The non-orbiting scroll 140 always overlaps with the space generated as the non-orbiting scroll 140 moves in the vertical direction between the bottom surface of the side wall portion 142 of the Even if it moves in the axial direction, the refrigerant passing through the injection flow path (Li) can be sealed by the sealing tube (170), which causes the refrigerant passing through the relatively high pressure injection flow path (Li) to flow through the relatively low pressure suction space ( Vs) to prevent leakage.

In addition, as shown in FIG. 7 , between the outer peripheral surface of the sealing tube 170 and the inner peripheral surface of the first sealing groove 138a, or between the outer peripheral surface of the sealing tube 170 and the inner peripheral surface of the second sealing groove 147a, an O-ring and The same sealing members 171 and 172 are inserted to further enhance the sealing effect.

However, as shown in FIG. 8 , when the non-orbiting scroll 140 is completely fixed to the main frame 130 in the axial direction, a separate sealing tube is not provided and the support surface 132 of the main frame 130 and By installing a sealing member 175 such as an O-ring between the bottom surface of the side wall 142 of the non-orbiting scroll 140, the refrigerant passing through the injection flow path Li leaks into the relatively low pressure suction space Vs. can also be prevented from happening.

In addition, although the first flow path 147 and the second flow path 148 are formed in the axial direction, the third flow path 149 moves upward from the end of the first flow path 147 toward the end of the second flow path 148 . It may be formed to be inclined. Accordingly, the refrigerant to be injected may smoothly flow in the injection passage Li.

In addition, when the stepped surface 141a is formed on the upper surface of the head plate 141 of the non-orbiting scroll 140 , the third flow path 149 is disposed as close to the discharge space Vd as possible, so that the discharge space Vd ) is quickly and efficiently transferred to the refrigerant passing through the third flow path 149 , thereby increasing the degree of superheat of the injected refrigerant.

On the other hand, in the orbiting scroll 150, the head plate part 151 supported by the main frame 130 is formed in a disk shape, and the top surface of the head plate part 151 is engaged with the non-orbiting wrap 143 to form a compression chamber P. A turning wrap 152 is formed, and a boss portion 153 coupled to the rotation shaft 125 may be formed on the bottom surface of the end plate portion 151 . A tip seal 154 may be installed at an upper end of the orbiting wrap 152 . As a result, the orbiting scroll 150 is engaged with the non-orbiting scroll 140 in a state of being eccentrically coupled to the rotation shaft 125 to perform a pivoting movement, leading to the suction chamber (Ps), the intermediate pressure chamber (Pm), and the discharge chamber (Pd). It is possible to form two pairs of compression chambers (P).

In the drawings, unexplained reference numeral 121 denotes a stator, and 122 denotes a rotor.

In the scroll compressor according to the present embodiment as described above, the refrigerant flows from the refrigeration cycle through the suction pipe 115 into the suction space Vs, which is the low-pressure part of the casing 110, and the low-pressure refrigerant introduced into the suction space Vs. flows into the intermediate pressure chamber Pm through the suction chamber Ps through the suction groove (not shown) of the non-orbiting scroll 140, and the orbiting scroll 150 and the non-orbiting It is compressed while moving to the center between the scrolls 140 and is discharged from the discharge chamber Pd to the discharge space Vd of the casing 110 through the discharge port 145 of the non-orbiting scroll 140, and this refrigerant is discharged A series of processes that are discharged into the refrigerating cycle through the tube 116 are repeated.

At this time, as shown in FIG. 2, the injection pipe 117 is branched from the middle of the refrigerant pipe L connecting the condenser 2 and the expander 3 of the refrigeration cycle, that is, at the outlet side of the condenser 2, and the injection The pipe 117 passes through the casing 110 of the scroll compressor 1 and is connected to an injection flow path Li provided in the scroll compressor.

Accordingly, the gas refrigerant discharged from the compressor (1) passes through the condenser (2), is converted into liquid refrigerant, passes through the first expansion device (3a), and the liquid that has passed through the first expansion device (3a) After the refrigerant passes through the injection heat exchanger (supercooler) 6, at least part of it is bypassed to the injection tube, and the injection refrigerant passes through the expansion device 5 and again passes through the injection heat exchanger 6 and passes through the injection tube ( 117) through the injection into the intermediate pressure chamber (Pm) of the compressor (1).

By the way, the injection refrigerant expands while passing through the injection expansion device 5 to become a state in which low-temperature and low-pressure liquid refrigerant and gas refrigerant are mixed, and this injection refrigerant passes through the inner tube 6b of the injection heat exchanger 6 while passing Heat is absorbed from the circulating refrigerant moving toward the evaporator through the outer tube 6a of the injection heat exchanger 6 . Accordingly, the injection refrigerant is converted into gas refrigerant and moves to the frame side passage 138 of the injection passage Li, while the circulating refrigerant moves to the evaporator 4 in a state of being supercooled to a lower temperature.

Here, the injection refrigerant flowing into the frame side flow path 138 of the main frame 130 flows into the scroll side flow path 146 provided in the non-orbiting scroll 140 along the frame side flow path 138, and the scroll The injection refrigerant flowing into the side flow path 146 moves along the first flow path 147 , the third flow path 149 , and the second flow path 148 constituting the scroll side flow path 146 to the intermediate pressure chamber Pm. is brought in

Then, the injection refrigerant flowing into the intermediate pressure chamber Pm is compressed through the suction chamber Ps and is combined with the refrigerant moving to the intermediate pressure chamber Pm. At this time, the injection refrigerant passes through the head plate 141 of the non-orbiting scroll 140 where the scroll side flow path 146 forms the discharge space Vd, and the high-temperature refrigerant filled in the discharge space Vd and the non-orbiting scroll ( 140) through heat conduction, and as a result, the injection refrigerant passes through the scroll-side flow path 146 and is heated by the refrigerant in the discharge space Vd. It is possible to reduce the risk of entering the compression chamber.

Meanwhile, another embodiment of the injection unit in the scroll compressor according to the present invention is as follows.

That is, in the above-described embodiment, the injection flow path is composed of the frame side flow path of the main frame and the scroll side flow path of the non-orbiting scroll, but in this embodiment, only the scroll side flow path of the non-orbiting scroll is formed.

That is, as in FIG. 9 , in this embodiment, as in the above-described embodiment, the outer peripheral surface of the end plate 141 of the non-orbiting scroll 140 is in close contact with the inner peripheral surface of the casing 110 to suck the inner space of the casing 110 . As the space Vs and the discharge space Vd are separated, the side wall 142 located below the head plate 141 of the non-orbiting scroll 140 radially penetrates through the injection flow path Li. An injection through hole 146a may be formed.

Here, the non-orbiting scroll 140 is formed to protrude by a predetermined height so that at least a portion of the side wall portion 142 is in close contact with the inner circumferential surface of the casing 110, and the side wall portion ( 142) may be formed with an injection through hole. Accordingly, the end of the injection pipe 117 passes through the casing 110 and is directly inserted into and communicates with the injection through hole 146a of the injection flow path, or the injection hole 112a of the casing 110 is formed to form the injection hole The injection pipe 117 may be connected to the outside of the 112a while the injection through hole 146a of the injection flow path Li may be communicated to the inside.

Since the scroll compressor according to the present embodiment as described above is substantially the same as the above-described embodiment in terms of basic configuration and effects, a detailed description thereof will be omitted. However, in this embodiment, as the injection flow path Li is formed only on the non-orbiting scroll 140, as in the above-described embodiment, the frame side flow path 138 and the frame side flow path 138 and the non-orbiting scroll 140, respectively. Compared to forming and communicating the scroll-side flow path 146 , this embodiment may be advantageous in terms of processing. In addition, in the above-described embodiment, a sealing portion such as the sealing tube 170 must be provided between the frame-side flow path 138 and the scroll-side flow path 146 . Compared to that, the number of parts and assembly man-hours can be reduced. Of course, in the present embodiment, since the injection tube 117 is directly connected to the injection flow path Li provided in the non-orbiting scroll 140 , the non-orbiting scroll 140 moves in the axial direction with respect to the main frame 130 . It can be applied to scroll compressors of the fixed type.

Another embodiment of the injection unit in the scroll compressor according to the present invention is as follows.

That is, in the above-described embodiments, the injection flow path is formed inside the main frame and the non-orbiting scroll, respectively, but in this embodiment, a part of the injection flow path is exposed to the outside of the main frame and the non-orbiting scroll.

For example, in this embodiment, as shown in FIG. 10 , the frame side flow path 138 is formed in the main frame 130 , and the non-orbiting scroll 140 communicates with the frame side flow path 138 , so that the outlet is an intermediate pressure chamber. A scroll-side flow path 146 communicating with Pm may be formed.

Here, the frame-side flow path 146 according to the present embodiment may be formed in the same manner as in the embodiment of FIG. 5 described above. However, in the scroll-side flow path 146 according to the present embodiment, the third flow path 149 is formed as a pipe, and passes through the outside of the non-orbiting scroll 140 to the first flow path, unlike the embodiment of FIG. 5 . 147 and the second flow path 148 may be connected.

In this case, the connecting pipe 149 constituting the third flow path is connected by welding or bolting one end to the outlet end of the first flow path 147 and the other end to the inlet end of the second flow path 148 , respectively, and discharge. It may be installed spaced apart from the top surface of the head plate 141 of the non-orbiting scroll 140 so as to be located inside the space Vd. Of course, the connection pipe 149 may be formed to be in close contact with the top surface of the end plate 141 of the non-orbiting scroll 140 .

In addition, the connection tube 149 may be formed of a material having good thermal conductivity, for example, a copper tube so that heat transfer from the discharge space Vd can be smoothly performed.

Since the injection unit according to the present embodiment as described above is substantially the same as the above-described embodiments in terms of basic configuration and effects, a detailed description thereof will be omitted. However, in this embodiment, as the connecting pipe 149 constituting the injection flow path is installed outside the non-orbiting scroll 140, the heat transfer area of the connecting pipe 149 is widened, so the heat transfer rate between the injected refrigerant and the discharged refrigerant. This can increase. In addition, the superheating degree of the injection refrigerant is further increased, so that it is possible to significantly reduce the room for the liquid refrigerant to flow.

Another embodiment of the injection unit in the scroll compressor according to the present invention is as follows.

That is, in the above-described embodiments, when the outer circumferential surface of the end plate portion of the non-orbiting scroll is in close contact with the inner circumferential surface of the casing to separate the inner space of the casing into a suction space and a discharge space, an injection flow path is formed in the main frame or the non-orbiting scroll. However, in this embodiment, when a separate high and low pressure separating plate is in close contact with the inner circumferential surface of the casing to separate the inner space of the casing into the suction space and the discharge space, the injection flow path is provided outside the main frame or the non-orbiting scroll.

For example, in the present embodiment, as shown in FIG. 11 , the high and low pressure separator 114 installed on the upper surface of the head plate 141 of the non-orbiting scroll 140 is fixedly coupled to the high and low pressure separator 114 . ) may be coupled to the outer peripheral surface of the cylindrical shell 111 and the inner peripheral surface of the upper shell 112 in close contact with each other. Accordingly, in the inner space of the casing 110 , with the high and low pressure separator 114 interposed therebetween, the lower space forms the suction space Vs, and the upper space forms the discharge space Vd, respectively.

In addition, as the non-orbiting scroll 140 has an outer diameter of the end plate 141 that is significantly smaller than the inner diameter of the cylindrical shell 111, the inner peripheral surface of the cylindrical shell 111 and the side wall of the non-orbiting scroll 140 are formed. (142) A wide space (S) forming a low pressure portion is formed between the outer peripheral surfaces. Therefore, one end of the inner injection tube 118 is connected to the external injection tube 117 that is through-coupled to the side wall of the cylindrical shell 111 so that the inner injection tube 118 is located in this space S, and the inner injection The other end of the tube 118 passes through the through hole 114a of the high and low pressure separation plate 114 to the injection hole (scroll side flow path) 146 that passes through the top surface of the head plate 141 of the non-orbiting scroll 140 . Connected.

As the suction space (Vs) and the discharge space (Vd) are separated by the high and low pressure separation plate (114), the inner injection pipe (118) is welded to the through hole (114a) through which the airtightness is maintained, and the inside It may be preferable to also weld between the other end of the injection tube 118 and the injection hole 146 of the non-orbiting scroll 140 to maintain airtightness. Accordingly, a part of the internal injection pipe 118 is located in the suction space Vs, but the other part is located in the discharge space Vd.

In addition, the internal injection tube 118 may be in close contact with the high and low pressure separator 114, but it is preferable to install it so that it is separated from the high and low pressure separator 114 in order to enlarge the heat exchange area with the discharge space Vd. can

In addition, it may be preferable that the internal injection tube 118 be formed of a material having a large thermal conductivity, such as a copper tube, as in the embodiment of FIG. 10 .

Since the injection unit according to the present embodiment as described above is substantially the same as the above-described embodiments in terms of basic configuration and effects, a detailed description thereof will be omitted. However, in this embodiment, as the internal injection pipe 118 constituting the injection oil is installed outside the non-orbiting scroll 140 like the connection pipe of FIG. 10 , the heat transfer area of the internal injection pipe 118 is widened, The heat transfer rate between the injection refrigerant and the discharge refrigerant may increase. In addition, the superheating degree of the injection refrigerant is further increased, so that it is possible to significantly reduce the room for the liquid refrigerant to flow.

In addition, in this embodiment, as the injection flow path is not formed through the main frame 130 or the non-orbiting scroll 140, but is formed using a separate internal injection pipe 118, the main frame 130 or the non-orbiting scroll Not only is it easy to manufacture the scroll 140 , but also it is possible to prevent deformation of the non-orbiting scroll 140 in advance, thereby stabilizing the behavior between the non-orbiting lap and the orbiting lap, thereby increasing reliability.

Claims (18)

The inner space is divided into a suction space and a discharge space, the suction space is connected to a suction pipe connected to an evaporator outlet side of the refrigeration cycle device, and the discharge space is connected to a discharge pipe connected to a condenser inlet side of the refrigeration cycle device being a casing;
a main frame coupled to the inside of the casing;
a non-orbiting scroll coupled to the main frame and having an inlet and an outlet;
an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber; and
One end is branched from the refrigerant pipe between the condenser and the evaporator, the other end is connected to the intermediate pressure chamber of the compression chamber through the casing, and at least a portion of a section connected to the intermediate pressure chamber through the casing is the discharge space Including an injection unit that exchanges heat with the refrigerant of
The injection unit,
an injection pipe having one end branched from the refrigerant pipe between the condenser and the evaporator and the other end coupled through the casing; and
and an injection flow path connected to the other end of the injection pipe and communicating with the intermediate pressure chamber through the inside of the main frame and the inside of the non-orbiting scroll,
The injection flow is
a frame side passage formed through the main frame and connected to one end of the injection tube; and
and a scroll-side flow path formed through the non-orbiting scroll, one end communicating with the frame side flow path and the other end communicating with the intermediate pressure chamber;
A frame side sealing groove and a scroll side sealing groove each having a predetermined depth are formed to face each other on one side of the main frame and one side of the non-orbiting scroll facing the side of the main frame,
A sealing tube communicating with the frame side flow path and the scroll side flow path is inserted into the frame side sealing groove and the scroll side sealing groove,
The sealing tube overlaps the surface where the main frame and the non-orbiting scroll meet in the axial direction,
The frame-side sealing groove extends from one end of the frame-side flow path to support one end of the sealing tube and is formed to be stepped, and the scroll-side sealing groove extends from one end of the scroll-side flow path to support the other end of the sealing tube. A scroll compressor, characterized in that it is formed to be stepped. delete According to claim 1,
The scroll side flow path,
One end communicates with the frame side flow path and the other end communicates with the intermediate pressure chamber. According to claim 1,
A connection pipe connected between the frame-side flow path and the scroll-side flow path is further included,
The connector is
The scroll compressor according to claim 1, wherein the non-orbiting scroll is located inside the discharge space outside the orbiting scroll. delete delete According to claim 1,
and a sealing member is provided between the outer circumferential surface of the sealing tube and the inner circumferential surface of each sealing groove. According to claim 1,
The inner space of the casing is separated into the suction space and the discharge space by the main frame or the non-orbiting scroll,
One end of the injection passage passes through an outer peripheral surface of the main frame and is connected to the injection tube. delete delete The inner space is divided into a suction space and a discharge space, the suction space is connected to a suction pipe connected to an evaporator outlet side of the refrigeration cycle device, and the discharge space is connected to a discharge pipe connected to a condenser inlet side of the refrigeration cycle device being a casing;
a high and low pressure separating plate provided in the casing to separate the suction space and the discharge space;
a main frame coupled to the inside of the casing;
a non-orbiting scroll coupled to the main frame and having an inlet and an outlet;
an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber; and
One end is branched from the refrigerant pipe between the condenser and the evaporator, the other end is connected to the intermediate pressure chamber of the compression chamber through the casing, and at least a portion of a section connected to the intermediate pressure chamber through the casing is the discharge space Including an injection unit that exchanges heat with the refrigerant of
The injection unit,
an external injection pipe having one end branched from the refrigerant pipe between the condenser and the evaporator and the other end coupled through the casing; and
One end is connected to the other end of the external injection tube, the other end includes an inner injection tube communicating with the intermediate pressure chamber,
The internal injection pipe is located inside the discharge space from the outside of the non-orbiting scroll,
One end of the internal injection pipe communicates with the external injection pipe in the suction space, and the other end of the internal injection pipe passes through the high and low pressure separation plate and is coupled to the non-orbiting scroll in the discharge space. compressor. delete The inner space is separated into a suction space and a discharge space, the suction space is connected to a suction pipe connected to an evaporator outlet side of the refrigerating cycle, and the discharge space is a casing to which a discharge pipe connected to the condenser inlet side of the refrigerating cycle is connected. ;
a main frame coupled to the inside of the casing;
a non-orbiting scroll coupled to the main frame and having an inlet and an outlet;
an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber;
an injection pipe branched from the refrigerant pipe between the condenser and the evaporator; and
One end is connected to the injection pipe in the suction space, the other end includes an injection flow path connected to the intermediate pressure chamber in the discharge space,
A scroll compressor characterized in that a first flow passage and a second flow passage passing through the main frame and the non-orbiting scroll are respectively formed, and the first flow passage and the second flow passage are connected by a connection pipe passing through the discharge space. . delete delete delete The inner space is separated into a suction space and a discharge space, the suction space is connected to a suction pipe connected to an evaporator outlet side of the refrigerating cycle, and the discharge space is a casing to which a discharge pipe connected to the condenser inlet side of the refrigerating cycle is connected. ;
a main frame coupled to the inside of the casing;
a non-orbiting scroll coupled to the main frame and having an inlet and an outlet;
an orbiting scroll in engagement with the non-orbiting scroll to form a compression chamber including a suction chamber, an intermediate pressure chamber, and a discharge chamber;
an injection pipe branched from the refrigerant pipe between the condenser and the evaporator; and
One end is connected to the injection pipe in the suction space, the other end includes an injection flow path connected to the intermediate pressure chamber in the discharge space,
The injection flow is
Further comprising an internal injection pipe communicating with the injection pipe and positioned in the discharge space inside the casing, and forming a flow path in the non-orbiting scroll that communicates with the internal injection pipe and communicates with the intermediate pressure chamber a scroll compressor. An air conditioner comprising the scroll compressor according to any one of claims 1, 3, 4, 7, 8, 11, 13, and 17.

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