KR20140017817A

KR20140017817A - A scroll compressor and an air conditioner including the same

Info

Publication number: KR20140017817A
Application number: KR1020120084425A
Authority: KR
Inventors: 김병수; 류병진
Original assignee: 엘지전자 주식회사
Priority date: 2012-08-01
Filing date: 2012-08-01
Publication date: 2014-02-12
Also published as: KR101382007B1

Abstract

The present invention relates to a scroll compressor and an air conditioner including the same. The scroll compressor according to the embodiment of the present invention comprises: a fixing scroll which has a first wrap; a turning scroll which is arranged to have a phase difference on the fixing scroll and has a second wrap forming a compression room in the interval with the first wrap; multiple absorbing parts which absorb refrigerants to the compression room; multiple first inlet parts which are equipped in one side of the fixing scroll and inject refrigerants to a first movement route of the refrigerants absorbed through a portion of the absorbing parts; multiple second inlet parts which are equipped in the other side of the fixing scroll and inject refrigerants to a second movement route of the refrigerants absorbed through the other part of the multiple absorbing parts; and a discharge hole which is equipped in the fixing scroll and discharges compressed refrigerants through the first movement route and second movement route.

Description

A scroll compressor and an air conditioner including the same {A scroll compressor and an air conditioner including the same}

The present invention relates to a scroll compressor and an air conditioner including the same.

The air conditioner is a device for keeping the air in a predetermined space in a most suitable condition according to the purpose of use and purpose. Generally, the air conditioner includes a compressor, a condenser, an expansion device, and an evaporator, and a refrigerant cycle for compressing, condensing, expanding, and evaporating the refrigerant is driven to cool or heat the predetermined space .

The predetermined space may be variously proposed depending on the place where the air conditioner is used. For example, when the air conditioner is installed in a home or an office, the predetermined space may be an indoor space of a house or a building. On the other hand, when the air conditioner is disposed in a car, the predetermined space may be a boarding space on which a person boarded.

On the other hand, the air conditioner may be operated to be switched to the cooling mode or the heating mode. When the air conditioner is operated in a cooling mode, the outdoor heat exchanger functions as a condenser and the indoor heat exchanger functions as an evaporator. 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. The air conditioner may be provided with a flow control valve for controlling the flow direction of the refrigerant to enable the switching of the cooling operation or the heating operation.

In Fig. 7, a conventional refrigerant cycle p-h diagram is shown. Referring to FIG. 6, the refrigerant is sucked into the compressor in state a, is compressed by the compressor, and is discharged into the state of b and flows into the condenser. The refrigerant in the b state may be formed in a liquid phase.

Then, the refrigerant is condensed in the condenser and discharged in the state of c, is throttled in the expansion device is changed to the state of d, that is, two-phase state. The refrigerant condensed in the expansion device flows into the evaporator, and heat-exchanges in the evaporator to change to a state. The refrigerant in state a is in the gas phase, and flows into the compressor in this state. This cycle of refrigerant is repeated.

According to this prior art, cooling or heating performance may be limited.

This refrigerant cycle is affected by the outdoor air condition of the place or region where the air conditioner is installed. For example, when the outside air condition of the place or area is not good, if the outside air temperature of the area where the air conditioner is installed is very high or very low, sufficient refrigerant circulation amount must be ensured to obtain the desired air conditioning performance.

In the related art, in order to secure a sufficient refrigerant circulation amount, it was intended to increase the capacity of the compressor. However, when increasing the capacity of the compressor, that is, the capacity, there is a problem that the manufacturing or installation cost of the compressor is increased.

In the system as shown in FIG. 7 when the state of the refrigerant discharged from the condenser is in a supercooled state, that is, when the degree of subcooling of the refrigerant is ensured, the evaporation capacity of the evaporator, that is, the lower area of the line connecting da may be increased. Since the supercooling degree of the refrigerant cannot be secured, there is a problem that such an improvement in performance cannot be expected.

The present invention has been proposed to solve this problem, and an object of the present invention is to provide a scroll compressor and an air conditioner including the same, which can increase the flow rate of refrigerant injected into the compressor.

A scroll compressor according to an embodiment of the present invention includes a fixed scroll having a first wrap; A pivoting scroll arranged to have a phase difference with respect to said fixed scroll, said pivoting scroll having a second wrap forming a compression chamber therebetween; A plurality of suction portions through which the refrigerant is sucked into the compression chamber; A plurality of first inlets provided on one side of the fixed scroll and injecting the refrigerant onto a first movement path of the refrigerant sucked through one of the plurality of suction units; A plurality of second inlets provided on the other side of the fixed scroll and injecting the refrigerant onto a second movement path of the refrigerant sucked through the other suction unit among the plurality of suction units; And a discharge hole provided in the fixed scroll and discharging the refrigerant compressed through the first and second movement paths.

An air conditioner according to an embodiment of the present invention includes a compressor for compressing a refrigerant; A condenser for condensing the refrigerant compressed by the compressor; A second injection flow path bypassing at least some of the refrigerant discharged from the condenser and injecting the refrigerant into the compressor; A first injection passage for injecting a refrigerant having a pressure lower than that of the second injection passage into the compressor; And an evaporator configured to evaporate the refrigerant condensed by the expansion device among the refrigerant discharged from the condenser, wherein the refrigerant is sucked through the evaporator, and a plurality of refrigerant suctions including a first suction part and a second suction part are provided. part; A first injection inlet unit guiding the refrigerant to be injected into the compression chamber in which the refrigerant sucked through the first suction unit is first compressed; A second injection inlet for guiding the refrigerant to be injected into the compression chamber in which the refrigerant sucked through the second suction unit is first compressed; And a turning scroll wrap that selectively opens the first injection inlet and the second injection inlet, and is moved to start opening of the first injection passage or the second injection passage at a point before the refrigerant inlet is shielded. do.

According to the present invention, it is possible to increase the refrigerant circulation amount of the system by making the injection of the refrigerant on the refrigerant path sucked through the plurality of suction unit, respectively, and there is an effect that the cooling and heating performance can be improved. In addition, since the injection of the refrigerant is performed two or more times along the compression path of the refrigerant, it is possible to increase the operating efficiency.

And, since the refrigerant forming the intermediate pressure can be injected into the compressor, it is possible to reduce the power required to compress the refrigerant in the compressor, there is an advantage that the heating and cooling efficiency can be increased accordingly.

In addition, since the first injection inlet may be opened before the refrigerant is completely sucked into the compressor through the refrigerant suction unit and injection may be performed when the refrigerant is compressed in one stage, the pressure (intermediate pressure) of the injected refrigerant may be lowered. Accordingly, there is an effect that the flow rate of the injected refrigerant can be increased.

In addition, since the first injection inlet and the second injection inlet are formed in the compressor with a predetermined phase difference, the opening and closing timings of the first injection inlet and the second injection inlet can be optimized, thereby effectively injecting and compressing the refrigerant. There is an advantage that it can.

1 is a system diagram showing the configuration of an air conditioner according to an embodiment of the present invention.
Figure 2 is a PH diagram showing a refrigerant system according to the operation of the air conditioner according to an embodiment of the present invention.
3 is a cross-sectional view showing the structure of a scroll compressor according to an embodiment of the present invention.
4 is a view showing some components of a scroll compressor according to an embodiment of the present invention.
5 is a view showing a state in which the refrigerant is sucked into the plurality of suction unit according to an embodiment of the present invention.
6 is a view showing a plurality of compression chambers are formed in the compression process of the scroll compressor according to an embodiment of the present invention.
7 is a PH diagram showing a refrigerant system according to the operation of the conventional air conditioner.

Hereinafter, specific embodiments of the present invention will be described with reference to the drawings. It is to be understood, however, that the spirit of the invention is not limited to the embodiments shown and that those skilled in the art, upon reading and understanding the spirit of the invention, may easily suggest other embodiments within the scope of the same concept.

1 is a system diagram showing the configuration of an air conditioner according to an embodiment of the present invention, Figure 2 is a P-H diagram showing a refrigerant system according to the operation of the air conditioner according to an embodiment of the present invention.

Referring to FIG. 1, a refrigeration cycle in which a refrigerant circulates is driven in an air conditioner 1 according to an embodiment of the present invention. The air conditioner 1 may be installed and operated in a home, an office, or a vehicle.

The air conditioner 1 includes a compressor 10 for compressing a refrigerant, a condenser 20 for condensing the refrigerant compressed by the compressor 10, and a refrigerant condensed in the condenser 20. The first and second expansion devices (30, 60) and the evaporator (70) for evaporating the refrigerant passing through the first and second expansion devices (30, 60) to expand the structure, and guides the flow of the refrigerant. Refrigerant pipe 15 is included. The condenser 20 may be one heat exchanger among an outdoor heat exchanger and an indoor heat exchanger, and the evaporator 70 may be another heat exchanger.

Although not separately shown in the drawings, the air conditioner 1 is provided with a flow switching valve and the refrigerant discharged from the compressor 10 flows into the outdoor heat exchanger or the indoor heat exchanger through the flow switching valve, thereby cooling or Heating operation can optionally be performed.

For example, when the air conditioner 1 is disposed in a home or an office, the compressor 10 may be provided in an outdoor unit and installed in an outdoor space. On the other hand, when the air conditioner 1 is disposed in the electric vehicle, the compressor 10 may be disposed in the vehicle body.

The compressor 10 may be a scroll compressor configured to be multistage compressible and configured to compress the refrigerant by a relative phase difference between the fixed scroll and the swing scroll. The related description will be described later.

The air conditioner 1 includes a plurality of subcooling devices 40 and 50 for supercooling the refrigerant passing through the condenser 20. The plurality of subcooling devices 40 and 50 may further include a second subcooling device 50 for supercooling the refrigerant having passed through the first expansion device 30 and a second supercooling device 50 for cooling the refrigerant having passed through the second subcooling device 50. One supercooling device 40 is included. The refrigerant discharged from the condenser 20 may not be expanded while passing through the first expansion device 30.

The air conditioner 1 is provided in the second injection passage 90 and the second injection passage 90 to bypass at least some of the refrigerant passing through the first expansion device 30. A second injection inflation portion 95 is provided for adjusting the amount of refrigerant bypassed. The refrigerant may be expanded in the process of passing through the second injection expansion unit 95.

The bypassed refrigerant among the refrigerant passing through the condenser 20 is called a "first branched refrigerant", and the remaining refrigerant except the branched refrigerant is called a "main refrigerant". In the second subcooling device 50, heat exchange is performed between the main refrigerant and the first branched refrigerant.

Since the first branched refrigerant changes to low temperature and low pressure while passing through the second injection expansion unit 95, the first branched refrigerant absorbs heat during heat exchange with the main refrigerant, and the main refrigerant radiates heat to the first branched refrigerant. Thus, the main refrigerant may be subcooled. In addition, the first branched refrigerant passing through the second subcooling device 50 is introduced (injected) into the compressor 10 through the second injection passage 90.

The second injection passage 90 includes a third injection inlet 91 and a fourth injection inlet 93 for injecting a refrigerant into the compressor 10. In addition, the second injection passage 90 further includes a second branch portion 92 which branches the refrigerant into the third injection inlet 91 and the fourth injection inlet 93.

The third injection inlet 91 and the fourth injection inlet 93 may be connected to different positions of the compressor 10. In detail, the third injection inlet 91 is connected to a third position (point) of the compressor 10, and the fourth injection inlet 93 is a fourth position (point) of the compressor 10. Can be connected to.

In summary, the refrigerant flowing through the second injection passage 90 is branched from the second branch 92 and injected into the compressor 10. At this time, the refrigerant flowing through the third and fourth injection inlets 91 and 93 is combined with the refrigerant compressed in the second stage in the compressor 10, and the combined refrigerant (C state, see FIG. 2) is 3. It can only be compressed.

The air conditioner 1 is provided in the first injection passage 80 and the first injection passage 80 to bypass at least some of the main refrigerant passing through the second subcooling device 50. And a first injection expansion part 85 for adjusting the amount of refrigerant bypassed. The refrigerant may be expanded in the process of passing through the first injection expansion unit 85.

The refrigerant bypassed to the first injection flow path 80 is called "second branched refrigerant". In the first subcooling device 40, heat exchange is performed between the main refrigerant and the second branched refrigerant.

Since the second branched refrigerant changes to low temperature and low pressure while passing through the first injection expansion unit 85, the second branched refrigerant absorbs heat during heat exchange with the main refrigerant, and the main refrigerant radiates heat to the second branched refrigerant. Thus, the main refrigerant may be subcooled. In addition, the second branched refrigerant passing through the first subcooling device 40 is introduced (injected) into the compressor 10 through the first injection passage 80.

The first injection flow path 80 includes a first injection inlet 81 and a second injection inlet 83 for injecting a refrigerant into the compressor 10. In addition, the first injection passage 90 further includes a first branch 82 which branches the refrigerant into the first injection inlet 81 and the second injection inlet 83.

The first injection inlet 81 and the second injection inlet 83 may be connected to different positions of the compressor 10. In detail, the first injection inlet 81 is connected to a first position (point) of the compressor 10, and the second injection inlet 83 is a second position (point) of the compressor 10. Can be connected to.

In summary, the refrigerant flowing through the first injection passage 80 is branched from the first branch 82 and injected into the compressor 10. At this time, the refrigerant injected through the first and second injection inlets 81 and 83 is combined with the refrigerant compressed in the first stage (or primary compression) in the compressor 10, and the combined refrigerant (B state, 2 may be two-stage compression (or secondary compression).

The refrigerant (main refrigerant) passing through the first subcooling device 40 is expanded while passing through the second expansion device 60 and then flows into the evaporator 70.

The refrigerant evaporated in the evaporator 70 flows into the compressor 10. In detail, the air conditioner 1 includes a branching portion 111c formed at the suction end of the compressor 10 to branch the refrigerant, and the refrigerant branched from the branching portion 111c to the compressor 10. The first suction part 111a and the second suction part 111b as the refrigerant suction part are included. In summary, the refrigerant evaporated in the evaporator 70 is sucked into the plurality of suction parts 111a and 111b via the branch part 111c. The first suction part 111a may be formed at one side of the compressor 10, and the second suction part 111b may be formed at the other side of the compressor 10. For example, the first and second suction parts 111a and 111b may be formed at positions facing each other.

With reference to FIG. 2, the P-H (pressure-enthalpy) diagram of the refrigerant system circulating the air conditioner will be described.

The refrigerant (A state) sucked into the compressor 10 is compressed (single stage compression) in the compressor 10 and mixed with the refrigerant injected into the compressor 10 through the first injection passage 80. At this time, the refrigerant flowing through the first injection passage 80 is branched from the first and second injection inlets 81 and 83 and introduced into the compressor 10, and the mixed refrigerant represents the state of B. .

The refrigerant (B state) is compressed again (two-stage compression), and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the second injection passage 90. At this time, the refrigerant flowing through the second injection passage 90 is branched from the third and fourth injection inlets 91 and 93 and introduced into the compressor 10, and the mixed refrigerant represents the state of C. .

Refrigerant (C state) is again compressed (three-stage compression) is introduced into the condenser 20 in the state of D, when discharged from the condenser 20 indicates the state of E.

The refrigerant (first branched refrigerant), which is bypassed among the refrigerant passing through the condenser 20 and passes through the second injection expansion unit 95, is expanded (K state) and is heat-exchanged with the main refrigerant of the E state. In this process, the main refrigerant of the E state is subcooled to the G state, and the first branched refrigerant of the K state is injected into the compressor 10 through the third and fourth injection inlets 91 and 93 and then the compressor ( It is mixed with the refrigerant in 10) to show the C state.

The refrigerant (the second branched refrigerant) which is bypassed among the main refrigerants (G state) passing through the second subcooling device 50 and passes through the first injection expansion unit 85 is expanded to the M state, and It is heat exchanged. In this process, the main refrigerant in the G state is subcooled to the H state, and the second branched refrigerant in the M state is injected into the compressor 10 through the first and second injection inlets 81 and 83 and then the compressor ( It is mixed with the refrigerant in 10) to show the B state.

The main refrigerant supercooled in the H state is expanded in the second expansion device 60 and then flows into the evaporator 70, and heat exchanges in the evaporator 70 to exchange the first and second suction parts 111a and 111b. Through the compressor 10 is introduced.

On the other hand, the pressure of the lead connecting the DH is "high pressure", the pressure of the lead connecting the CK, that is, the pressure in the second injection flow path 90 is the "second intermediate pressure", the pressure of the lead connecting the BM, ie The pressure in the first injection flow path 80 may be referred to as "first intermediate pressure", and the pressure in the diagram connecting AI may be referred to as "low pressure".

At this time, the flow rate Q1 injected into the compressor 10 through the first injection flow path 80 may be proportional to the differential pressure between the high pressure and the first intermediate pressure, and the second injection flow path 90 Flow rate (Q2) injected into the compressor 10 through the may be proportional to the difference pressure between the high pressure and the second intermediate pressure. That is, the greater the pressure difference between the high pressure and the intermediate pressure, the greater the flow rate of the injected refrigerant.

Therefore, as the first intermediate pressure and the second intermediate pressure are formed on the low pressure side, the flow rate injected into the compressor 10 may increase.

3 is a cross-sectional view showing the structure of a scroll compressor according to an embodiment of the present invention, Figure 4 is a view showing a part of the configuration of a scroll compressor according to an embodiment of the present invention.

3 and 4, a scroll compressor 10 according to an embodiment of the present invention includes a housing 110 forming an appearance, a discharge cover 112 shielding an upper side of the housing, and the housing 110. The base cover 116 is provided below the base and stores oil. At least a portion of the discharge cover 112 defines a plurality of suction portions 111a and 111b for allowing refrigerant to flow into the compressor 10.

The scroll compressor 10 includes a motor 160 accommodated in the housing 110 to generate rotational force, a drive shaft 150 rotating through a center of the motor 160, and the drive shaft 150. The main frame 140 supporting the upper portion of the) and the compression unit provided on the upper side of the main frame 140 to compress the refrigerant.

The motor 160 includes a stator 161 coupled to the inner circumferential surface of the housing 110 and a rotor 162 in which the stator 161 is rotated therein. The drive shaft 150 is disposed to pass through the center of the rotor 162.

In the center of the drive shaft 150, the oil supply passage 157 is formed to be eccentric to any one side, the oil flowing into the oil supply passage 157 is the centrifugal force generated by the rotation of the drive shaft 150 Rises.

The oil supply unit 155 is coupled to the lower side of the drive shaft 150, so that the oil stored in the base cover 116 may be moved to the oil supply passage 157 while being integrally rotated together with the drive shaft 150. do.

The main frame includes a fixed scroll 120 fixed to an upper surface of the main frame 140 and in communication with the refrigerant suction unit 111, and a compression chamber engaged with the fixed scroll 120 to form a compression chamber. The swinging scroll 130 which is rotatably supported on the upper surface of the 140 and an old dam ring installed between the turning scroll 130 and the main frame 140 to prevent the rotating scroll 130 from rotating. 131, Oldham's ring). The pivoting scroll 130 is coupled to the drive shaft 150, receives a rotational force from the drive shaft 150.

The fixed scroll 120 and the orbiting scroll 130 are disposed to have a phase difference of 180 degrees with each other. The fixed scroll 120 is provided with a spiral fixed scroll wrap 123, the pivoting scroll 130 is provided with a spiral scroll wrap 132. For convenience, the fixed scroll wrap 123 is referred to as a "first wrap" and the orbiting scroll wrap 132 is referred to as a "second wrap".

A plurality of compression chambers may be formed by engaging the fixed scroll wrap 123 and the swing scroll wrap 132. The refrigerant introduced into the plurality of compression chambers by the pivoting motion of the pivoting scroll 130 may be compressed at a high pressure. In addition, a discharge hole 121 through which the refrigerant and the oil fluid compressed at high pressure are discharged is formed at the substantially center of the upper portion of the fixed scroll 120.

Specifically, the plurality of compression chambers are moved in the center direction toward the discharge holes 121 by the orbiting motion of the orbiting scroll 130, the volume is reduced, the refrigerant is compressed in a reduced volume, 121 to the outside of the fixed scroll (120).

At one side of the fixed scroll 120, a discharge hole 122 for lowering the high pressure fluid discharged through the discharge hole 121 is formed. The fluid discharged through the discharge hole 122 is introduced into the housing 110 and then discharged through the discharge pipe 114.

Meanwhile, the first and second injection inlets 81 and 83 and the third and fourth injection inlets 91 and 93 pass through the discharge cover 112 and are coupled to the fixed scroll 120. The fixed scroll 120 is formed with a first injection hole 124a to which the first injection inlet 81 is coupled and a second injection hole 124b to which the second injection inlet 83 is coupled. . The first injection inlet 81 and the second injection inlet 91 may be inserted into the injection holes 124a and 124b, respectively.

The first injection hole 124a and the second injection hole 124b are provided with a sealing part 127 which prevents the injected refrigerant from leaking to the outside of the fixed scroll 120. The sealing unit 127 may be disposed to surround the outer circumferential surfaces of the first injection inlet 81 and the second injection inlet 91, respectively.

In addition, the fixed scroll 120 is formed with a third injection inlet hole 125a and a fourth injection inlet hole 125b to which the third injection inlet 91 and the fourth injection inlet 93 are respectively coupled. do. Sealing parts may be provided in the third and fourth injection inlet holes, respectively.

In the process of rotating the pivoting scroll 130, the pivoting scroll wrap 132 includes the plurality of suction parts 111a and 111b, the first and second injection holes 124a and 124b, and the third and fourth injection holes. The 125a and 125b can be selectively opened and closed.

In detail, when the orbiting scroll wrap 132 is in the first position or when the drive shaft 150 is at the first angle, the plurality of suction portions 111a and 111b are opened so that refrigerant is supplied to the compressor 10. Flows into. When the turning scroll 130 continues to turn, the turning scroll wrap 132 shields the plurality of suction parts 111a and 111b and the refrigerant in the compression chamber is compressed to close the discharge hole 121. Discharged through. As described above, by the swinging movement of the swinging scroll 130, the process of opening and shielding the refrigerant suction unit and compressing the refrigerant is repeatedly performed.

On the other hand, during the compression of the refrigerant, the refrigerant in the injection flow path (80,90) is the plurality of injection through the first and second injection inlet (81,83) or the third, fourth injection inlet (91,93) Is optionally injected into the compression chamber. As described above, the refrigerant injected through the first and second injection inlets 81 and 83 is combined with the first stage compressed refrigerant to be compressed into two stages, and the third and fourth injection inlets 91 and 93 are respectively compressed. The refrigerant injected through may be combined with the two-stage compressed refrigerant to be three-stage compressed.

The refrigerant cycle formed according to the positions of the first and second injection inlets 81 and 83 and the second injection inlets 91 and 93 may vary. In this case, the positions of the injection inlets 81, 83, 91, and 93 may be rotated to some extent from the time point at which the refrigerant suction through the plurality of suction units 111a and 111b is completed. Can be understood as a concept of whether the injection inlet can be opened. Here, the degree of rotation of the swing scroll 130 may correspond to the degree of rotation of the drive shaft 150.

In other words, the first and second injection inlets 81 and 83 may be compressed when a certain amount of compression is performed based on a time point at which the refrigerant is sucked through the refrigerant suction units 111a and 111b. Or it is specified whether the injection is made through the third and fourth injection inlet (91,93). Detailed description thereof will be described below with reference to the accompanying drawings.

5 is a view showing a state in which the refrigerant is sucked into the plurality of suction unit according to an embodiment of the present invention, Figure 6 shows a state in which a plurality of compression chamber is formed in the compression process of the scroll compressor according to an embodiment of the present invention. Drawing.

Referring to FIG. 5, the refrigerant is sucked into the compressor 10 via the plurality of suction parts 111a and 111b. In detail, at least some of the refrigerant to be sucked into the compressor 10 flows to one side of the compressor 10 through the first suction part 111a, and the other part of the refrigerant flows through the second suction part 111b. It flows to the other side of (10).

In addition, the refrigerant passing through the plurality of suction parts 111a and 111b may flow through a space formed by the fixed scroll wrap 123 and the swing scroll wrap 132.

In detail, some refrigerant is introduced into the scroll wraps 123 and 132 through a space S1 formed between one side of the swing scroll wrap 132 and one side of the fixed scroll wrap 123. Then, the remaining refrigerant flows inwardly of the scroll wraps 123 and 132 through a space S2 formed between the other side of the orbiting scroll wrap 132 and the other side of the fixed scroll wrap 123.

On the other hand, the discharge hole 121 is formed in the inner central portion of the scroll wrap (123,132) having a spiral shape, the refrigerant moved to the center portion during the compression process is discharged to the upper through the discharge hole 121.

The first injection inlet 81 and the second injection inlet 83 are formed at positions opposite to or facing each other with respect to the discharge hole 121. In other words, an imaginary line connecting the first and second injection inlets 81 and 83 may be formed to pass through the center of the discharge hole 121, that is, the fixed scroll 120.

In addition, the third injection inlet 91 and the fourth injection inlet 93 are formed at positions opposite to or facing each other with respect to the discharge hole 121. In other words, a virtual line connecting the third and fourth injection inlets 91 and 93 may be formed to pass through the center of the discharge hole 121 and the fixed scroll 120.

The refrigerant sucked into the compressor 10 converges and flows to the center portions of the scroll wraps 123 and 132 during the compression process. Therefore, the distance between the first injection inlet portion 81 or the second injection inlet portion 83 and the discharge hole 121 to which the refrigerant forming the first intermediate pressure is to be injected is injected by the refrigerant forming the second intermediate pressure. It is formed larger than the distance between the third injection inlet 91 or the fourth injection inlet 93 and the discharge hole 121 to be.

Referring to FIG. 6, when the suction of the refrigerant through the plurality of suction parts 111a and 111b is completed, the turning scroll wrap 132 turns to shield the plurality of suction parts 111a and 111b, and A plurality of compression chambers are formed between the first and second wraps 123 and 132. The plurality of compression chambers are reduced in volume while moving in the direction of the center of the fixed scroll 120.

In detail, in the plurality of compression chambers, the first compression chamber 210 in which the refrigerant introduced through the S1 space exists, the second compression chamber 310 in which the refrigerant introduced through the S2 space exists, and the The refrigerant in the third compression chamber 220 and the second compression chamber 310 formed when the refrigerant in the first compression chamber 210 is compressed while moving toward the center of the first and second wraps 123 and 132 is The fourth compression chamber 320 is formed when it is compressed while moving in the center direction of the first and second wraps 123 and 132.

That is, the first compression chamber 210 and the third compression chamber 220 are positioned on the movement path (first movement path) of the refrigerant flowing through the S1 space and discharged to the discharge hole 121. The second compression chamber 310 and the fourth compression chamber 320 may be positioned on a movement path (second movement path) of the refrigerant flowing through the S2 space and discharged to the discharge hole 121.

Meanwhile, the first injection inlet 81 may be positioned on a path through which the refrigerant in the second compression chamber 310 flows to the fourth compression chamber 320, that is, on the second movement path. The refrigerant injected through the first injection inlet 81 is joined with the refrigerant compressed in the second compression chamber 310 to form a fourth compression chamber 320, and in the fourth compression chamber 320. Can be compressed.

The third injection inlet 91 may be located on a path through which the refrigerant in the fourth compression chamber 320 flows to the discharge hole 121, that is, on the second movement path. The refrigerant injected through the third injection inlet 91 may be combined with the refrigerant compressed in the fourth compression chamber 310 to be compressed and then discharged to the discharge hole 121.

The second injection inlet 83 may be located on a path through which the refrigerant in the first compression chamber 210 flows to the third compression chamber 220, that is, on the first movement path. The refrigerant injected through the second injection inlet 83 is joined with the refrigerant compressed in the first compression chamber 210 to form a third compression chamber 220, and in the third compression chamber 320. Can be compressed.

In addition, the fourth injection inlet 93 may be located on a path through which the refrigerant in the third compression chamber 220 flows to the discharge hole 121, that is, on the first movement path. The refrigerant injected through the fourth injection inlet 93 may be combined with the refrigerant compressed in the third compression chamber 310 to be compressed and then discharged to the discharge hole 121.

In summary, the refrigerant of the third compression chamber 220 or the fourth compression chamber 320 is compressed while moving further toward the center of the fixed scroll 120, and finally the compressor is discharged through the discharge hole 121. It may be discharged to the outside of the (10).

The second injection inlet 83 and the fourth injection inlet 93 are disposed on a path (first movement path) through which the refrigerant sucked through the S1 space is discharged. And the first injection inlet 81 and the third injection inlet 91 are disposed on a path (second movement path) through which the refrigerant sucked through the S2 space is discharged. 2 inlet ".

Meanwhile, the first and second injection inlets 81 and 83 or the third and fourth injection inlets 91 and 93 may be selectively opened by the turning scroll wrap 132. For example, when the first and second injection inlets 81 and 83 are opened, the third and fourth injection inlets 91 and 93 may be shielded by the pivoting scroll wrap 132 and the first When the second injection inlets 81 and 83 are opened, the third and fourth injection inlets 91 and 93 may be shielded by the turning scroll wrap 132.

At this time, the first injection inlet 81 and the second injection inlet 83 are simultaneously opened and closed by the pivoting scroll wrap 132, and the third injection inlet 91 and the fourth injection inlet. 93 may be opened and closed at the same time by the orbiting scroll wrap 132.

The first injection inlet 81 and the second injection inlet 83 may be opened before the time point at which the refrigerant is suctioned through the plurality of suction units 111a and 111b, respectively. In addition, the first injection inlet 81 and the second injection inlet 83 may be gradually opened while the pivoting scroll wrap 132 moves. That is, the turning scroll wrap 132 opens the first injection inlet 81 and the second injection inlet 83 before the time point at which the refrigerant suction through the refrigerant intakes 111a and 111b is completed. Can be arranged to do so.

Therefore, even if the first injection inlet 81 and the second injection inlet 83 are opened to start the injection of the refrigerant before the suction of the refrigerant through the refrigerant intakes 111a and 111b is completed, the first injection of the refrigerant is started. When the first injection inlet 81 and the second injection inlet 83 are completely opened and the injection amount of the refrigerant is increased, the refrigerant is compressed at or after the refrigerant intakes 111a and 111b are shielded. It may be a time point.

For example, when the suction of the refrigerant through the refrigerant suction parts 111a and 111b is completed, that is, when the refrigerant suction parts 111a and 111b are shielded by the pivoting scroll wrap 132, the driving shaft 150 may be used. When the rotation angle of) is 0 °, the opening of the first injection inlet 81 and the second injection inlet 83 is performed when the rotation angle of the drive shaft 150 is -10 ° to -30 °. Can be started.

Here, it may be understood that the suction of the refrigerant is completed when the rotation angle of the drive shaft 150 is 0 °, and the compression of the refrigerant is gradually performed as the rotation angles increase to 10 ° and 20 °.

The first injection inlet 81 and the second injection inflow are near the time point at which the driving shaft 150 is further rotated so that the refrigerant suction parts 111a and 111b are shielded by the orbiting scroll wrap 132. Part 83 is fully open, allowing a lot of refrigerant to be injected.

As such, when the suction of the refrigerant into the compressor 10 is completed, when the injection of the refrigerant through the first injection inlet 81 and the second injection inlet 83 is performed, the first in the PH diagram may be used. Since the intermediate pressure is formed low, the effect that the injection amount of the refrigerant can be increased.

The refrigerant injected through the first injection inlet 81 and the second injection inlet 83 is mixed with the refrigerant in the compressor 10 and compressed in two stages.

On the other hand, the third injection inlet 91 and the fourth injection inlet 93 is the drive shaft (A) from the time when the first injection inlet 81 and the second injection inlet 83 starts to open. Based on the rotation angle of the rotation 150 (or the rotation angle of the turning scroll wrap 132), it may start to open at a time that passes by 180 to 190 °.

For example, if the first injection inlet 81 and the second injection inlet 83 starts to open at a rotation angle of −20 °, when the rotation angle of the drive shaft 150 is 160 to 170 °, The third injection inlet 91 and the fourth injection inlet 93 may begin to open.

By such a configuration, when the third injection inlet 91 and the fourth injection inlet 93 are opened, the first injection inlet 81 and the second injection inlet 83 are shielded. The opening of the first injection inlet 81 and the second injection inlet 83 and the third injection inlet 91 and the fourth injection inlet 93 may be prevented.

In this case, the injection inlets 81, 83, 91, and 93 are all open to prevent the refrigerant from occurring due to pressure differences in the plurality of compression chambers. At this time, the refrigerant outflow, it can be understood that the refrigerant flows from one compression chamber to another compression chamber.

In addition, when the third injection inlet 91 and the fourth injection inlet 93 begin to open, the first injection inlet 81 and the second injection inlet 83 may be pivoted. It may be shielded by the wrap 132.

In addition, during the section in which the driving shaft 150 is further rotated by 180 °, the compressor 10 performs the second stage compression, and the third injection inlet 91 and the fourth injection inlet 93 are formed. The time point at which is started to open may be a time point before the two-stage compression is completed.

When the driving shaft 150 is further rotated from the time when the third injection inlet 91 and the fourth injection inlet 93 start to open, the third injection inlet 91 and the fourth injection inlet ( 93 is fully open so that a larger amount of refrigerant can be injected, which may be near the point where the two stage compression is completed.

The refrigerant injected through the third injection inlet 91 and the fourth injection inlet 93 is mixed with the refrigerant in the compressor 10 and compressed in three stages. The three-stage compressed refrigerant may be discharged to the outside of the fixed scroll 120 through the discharge hole 121.

When the third injection inlet 91 and the fourth injection inlet 93 are rotated by 180 to 190 ° based on the rotation angle of the driving shaft 150 from the time when the first injection inlet 91 is opened, the first injection inlet ( 81 and the second injection inlet 83 can be opened. That is, when the rotation angle of the drive shaft 150 is 340 to 360 °, that is, when the rotation angle of the driving shaft 150 is -20 to 0 ° based on one rotation of 360 degrees, the first injection inlet 81 and the second injection inlet ( 83) can be opened.

As such, when the refrigerant suction in the compressor 10 is completed, injection of the refrigerant through the first injection passage 80 is performed in earnest, thereby lowering the first intermediate pressure. In response to the completion of the two-stage compression in the injection of the refrigerant through the second injection flow path 90 is made in earnest can reduce the second intermediate pressure, there is an effect that can increase the amount of refrigerant injected.

Other embodiments are suggested.

In FIG. 1, in order to inject a refrigerant forming an intermediate pressure, a plurality of subcooling devices are provided. Alternatively, at least one of the plurality of subcooling devices may be replaced by a phase separator. The phase separator may be understood as a device for separating at least a portion of the gaseous refrigerant of the refrigerant in a two-phase state and introducing the refrigerant into the compressor.

1: air conditioner 10: compressor
20 condenser 30 first expansion device
40: first supercooling device 50: second supercooling device
60: second expansion device 70: evaporator
80: first injection path 81: first injection inlet
83: second injection inlet 90: second injection flow
91: third injection inlet 93: fourth injection inlet
111a: first suction part 111b: second suction part
120: fixed scroll 121: discharge hole
123: fixed scroll wrap 130: orbiting scroll
132: turning scroll wrap 210: first compression chamber
310: second compression chamber 220: third compression chamber
320: fourth compression chamber

Claims

A fixed scroll having a first wrap;
A pivoting scroll arranged to have a phase difference with respect to said fixed scroll, said pivoting scroll having a second wrap forming a compression chamber therebetween;
A plurality of suction portions through which the refrigerant is sucked into the compression chamber;
A plurality of first inlets provided on one side of the fixed scroll and injecting the refrigerant onto a first movement path of the refrigerant sucked through one of the plurality of suction units;
A plurality of second inlets provided on the other side of the fixed scroll and injecting the refrigerant onto a second movement path of the refrigerant sucked through the other suction unit among the plurality of suction units; And
And a discharge hole provided in the fixed scroll and discharging the refrigerant compressed through the first and second movement paths.

The method of claim 1,
In the plurality of first inlets,
A second injection inlet for injecting the refrigerant into the compression chamber in which the refrigerant sucked through the one suction unit is first compressed; And
And a fourth injection inlet for injecting the refrigerant into the compression chamber in which the refrigerant injected through the second injection inlet is second compressed.

3. The method of claim 2,
In the plurality of second inflow portion,
A first injection inlet for injecting the refrigerant into the compression chamber in which the refrigerant sucked through the other suction unit is first compressed; And
And a third injection inlet for injecting the refrigerant into the compression chamber in which the refrigerant injected through the first injection inlet is second compressed.

The method of claim 3, wherein
The second wrap,
And in the turning of the turning scroll, the opening of the first injection inlet and the second injection inlet starts before the suction of the refrigerant through the suction unit is completed.

The method of claim 3, wherein
The first injection inlet and the second injection inlet are simultaneously opened and closed,
And the third injection inlet and the fourth injection inlet are opened and closed at the same time.

The method of claim 3, wherein
The distance from the first injection inlet to the discharge hole is greater than the distance from the third injection inlet to the discharge hole,
And the distance from the second injection inlet to the discharge hole is greater than the distance from the fourth injection inlet to the discharge hole.

The method of claim 3, wherein
Further comprising a drive shaft for transmitting a rotational force to the pivoting scroll,
When the drive shaft rotation angle is 0 ° when the suction of the coolant through the plurality of suction units is completed, opening of the first injection inlet and the second injection inlet may result in the rotation angle of the drive shaft being -10 ° to -30. Scroll compressor, characterized in that it is started at °.

The method of claim 7, wherein
The opening of the third injection inlet and the fourth injection inlet,
And after the opening of the first injection inlet and the second injection inlet is started, when the rotation angle is further increased by 180 to 190 °.

The method of claim 3, wherein
And a virtual line connecting the first injection inlet and the second injection inlet or a virtual line connecting the third injection inlet and the fourth injection inlet pass through the discharge hole.

The method of claim 1,
Further comprising a discharge cover for shielding the upper side of the fixed scroll and the swing scroll,
And the plurality of first inlets and the second inlets are coupled to the fixed scroll through the discharge cover.

A compressor for compressing the refrigerant;
A condenser for condensing the refrigerant compressed by the compressor;
A second injection flow path bypassing at least some of the refrigerant discharged from the condenser and injecting the refrigerant into the compressor;
A first injection passage for injecting a refrigerant having a pressure lower than that of the second injection passage into the compressor; And
Among the refrigerant discharged from the condenser includes an evaporator for evaporating the refrigerant condensed in the expansion device,
In the compressor,
A plurality of refrigerant suction parts through which the refrigerant passing through the evaporator is sucked and including a first suction part and a second suction part;
A first injection inlet unit guiding the refrigerant to be injected into the compression chamber in which the refrigerant sucked through the first suction unit is first compressed;
A second injection inlet for guiding the refrigerant to be injected into the compression chamber in which the refrigerant sucked through the second suction unit is first compressed; And
A turning scroll wrap which opens at least one of the first injection inlet and the second injection inlet, and which is moved to start to open the first injection passage or the second injection passage at a time before the refrigerant inlet is shielded; Air conditioner included.

The method of claim 11,
A third injection inlet unit guiding the refrigerant to be injected into the second compressed compression chamber by combining the refrigerant sucked through the first suction unit and the injection refrigerant through the first injection inlet unit; And
And a fourth injection inlet unit configured to guide the refrigerant to be injected into the second compressed compression chamber by combining the refrigerant sucked through the second suction unit and the injection refrigerant through the second injection inlet unit.

The method of claim 11,
The first injection flow path,
And the plurality of refrigerant intakes are fully open when shielded.

The method of claim 11,
The second injection passage,
And after the first injection flow path starts to open, when the turning scroll wrap is rotated 180 to 190 degrees, the air conditioner starts to open.

The method of claim 11,
The method of claim 9,
The compressor is disposed in the outdoor unit of the home or office air conditioner, or the air conditioner, characterized in that disposed in the body of the vehicle.