KR20190131839A - Compressor with refrigerant injection function - Google Patents

Abstract

The present invention relates to a compressor which has a refrigerant injection function to secure refrigerant circulation rates, and actively responds to outdoor air temperature changes to enhance cold area performance. According to the present invention, the compressor comprises a plurality of inflow units for injecting refrigerants into a compression chamber after suction of the refrigerants is completed. Moreover, the refrigerants having different pressure can be injected into the compression chamber. The inflow units are divided into at least two inflow units to be connected to at least two injection holes formed in different positions of the compression chamber.

Description

Compressor with refrigerant injection function

The present invention relates to a compressor including a refrigerant injection function to ensure a sufficient amount of refrigerant circulation in a compressor.

An air conditioner is a home appliance for maintaining indoor air in a state most suitable for use and purpose. An air conditioner circulates a refrigerant and performs compression, condensation, expansion and evaporation processes.

The air conditioner may be classified into a separate air conditioner that separates the indoor unit and the outdoor unit, and an integrated air conditioner that combines the indoor unit and the outdoor unit into one device, depending on whether the indoor unit and the outdoor unit are separated.

The outdoor unit includes an outdoor heat exchanger that exchanges heat with the outside, and the indoor unit includes an indoor heat exchanger that exchanges heat with indoor air. The air conditioner may have a structure switchable to a cooling mode or a heating mode.

If the outside conditions are not good, the cooling or heating performance of the air conditioner may be limited. For example, even if the outside air temperature in the air conditioner is very high or very low, sufficient refrigerant circulation must be ensured to ensure the desired sufficient cooling and heating performance.

As a method for securing the refrigerant circulation amount, there is a method of increasing the capacity of the compressor. However, when the compressor having a large capacity is applied, there is a problem in that the manufacturing cost of the air conditioner is increased.

The compressor may be classified into a reciprocating compressor, a rotary compressor, a scroll compressor, and the like according to a method of compressing a refrigerant.

Among these, the scroll compressor has a structure in which the swinging scroll is engaged with the fixed scroll fixed to the inner space of the hermetic container. In the scroll compressor, a compression chamber is formed between the fixed wrap of the fixed scroll and the swing wrap of the swing scroll.

Scroll compressors have an advantage of obtaining a relatively high compression ratio compared to other types of compressors. In addition, the scroll compressor has an advantage in that the suction, compression, and discharge strokes of the refrigerant are smoothly performed to obtain stable torque. Due to these advantages, scroll compressors are widely used for refrigerant compression in air conditioners.

Republic of Korea Patent Publication No. 10-2016-0086639 (published July 20, 2016)

An object of the present invention is to provide a compressor that can reduce the deterioration of the heating capacity of the air conditioner when the temperature of the outside air is low.

When the temperature of the outside air in which the outdoor unit of the air conditioner is installed is excessively low, the density of the refrigerant sucked by the evaporation temperature decreases. When the density of the refrigerant decreases, the refrigerant circulation amount decreases. The present invention is to provide a compressor including a refrigerant injection function for ensuring a sufficient circulation flow rate of the refrigerant even when the outside air temperature is lowered.

The present invention is to provide a compressor that can be injected in four or more stages in the interior of the compressor, to more actively respond to changes in the outside temperature to enhance cold performance and improve efficiency.

Another object of the present invention is to provide a compressor that increases the degree of freedom of the refrigerant circulation amount control by optimizing the injection position of the compressor injected in the fourth or fifth stage.

The present invention provides a compressor including a refrigerant injection function for ensuring a sufficient circulation flow rate of the refrigerant even when the outside air temperature is lowered. The compressor according to the present invention includes a plurality of inlets for injecting the refrigerant into the compression chamber after the suction of the refrigerant is completed, and provides a structure in which refrigerants of different pressures can be injected into the compression chamber. The inlet may be branched into two or more and connected to two or more injection holes formed in different positions of the compression chamber.

At this time, the compressor according to the present invention may be provided with an opening and closing means for preventing the back flow of the refrigerant flowing in connected to the plurality of inlet.

The present invention provides a compressor that can perform injection in the fourth stage or more inside the compressor, thereby more actively responding to the change in the outside air temperature, thereby enhancing cold weather performance and improving efficiency. To this end, the present invention provides an optimum position of the injection hole for the compressor having an injection function to perform the four-stage injection.

The first injection hole of the compressor according to the present invention is disposed at a position in which a reference line connecting the center of the fixed scroll and the suction part is rotated by 61 to 101 in a direction opposite to the rotation direction of the compression chamber, and the second injection hole is The third injection hole is disposed at a position rotated by 75 to 115 in the rotation direction of the compression chamber at the position of the first injection hole, and the third injection hole is disposed at a position rotated by 60 to 90 in the rotation direction of the compression chamber at the position of the second injection hole. The fourth injection hole may be disposed at a position rotated by 60 to 100 in the rotation direction of the compression chamber at the position of the third injection hole.

In addition, the present invention provides an optimum position of the injection hole for the compressor having an injection function to perform the five-stage injection. The first injection hole of the compressor according to the present invention is disposed at a position in which a reference line connecting the center of the fixed scroll and the center of the suction part is rotated by 61 to 101 in a direction opposite to the rotation direction of the compression chamber, and the second injection hole is made of The third injection hole is disposed at a position rotated by 50 to 80 in the rotation direction of the compression chamber at the position of the first injection hole, the third injection hole is disposed at a position rotated by 60 to 80 in the rotation direction of the compression chamber at the position of the second injection hole, The fourth injection hole is disposed at a position rotated by 60 to 80 in the rotation direction of the compression chamber at the position of the third injection hole, and the fifth injection hole is 55 to 75 in the rotation direction of the compression chamber at the position of the fourth injection hole. It can be placed in a rotated position.

The compressor according to the present invention can increase the refrigerant circulation in the system by injecting the refrigerant into different positions of the compression chamber. In addition, the compressor according to the present invention has the effect of improving the cooling and heating performance by increasing the refrigerant circulation amount.

The compressor according to the invention has four or more injection inlets. The compressor according to the present invention has an effect of increasing the amount of refrigerant circulation through the structure in which the refrigerant injection is performed four or more times until the refrigerant is discharged after the suction is completed.

In the compressor according to the present invention, since the refrigerant forming the intermediate pressure can be injected into the compressor, there is an effect that can reduce the power required to compress the refrigerant in the compressor.

The compressor according to the present invention can optimize the injection timing by adjusting the injection time of the refrigerant through the injection inlet by the on-off valve, thereby preventing the refrigerant inside the compressor from flowing back to the injection inlet, and improve the reliability of the compressor operation There is an effect that can be improved.

The compressor according to the present invention provides a structure in which one injection inlet is connected to a plurality of injection holes, thereby simplifying the configuration of the air conditioner and securing an injection flow rate.

1 is a system diagram showing a configuration of an air conditioner to which a compressor according to a first embodiment of the present invention is applied.
2 is a PH diagram showing a change in refrigerant properties according to the operation of the air conditioner to which the compressor according to the first embodiment of the present invention is applied.
3 is a view showing the structure of a compressor according to a first embodiment of the present invention.
4 is a view showing the arrangement of the injection inlet of the compressor according to the first embodiment of the present invention.
5 is a system diagram showing a configuration of an air conditioner to which a compressor according to a second embodiment of the present invention is applied.
FIG. 6 is a PH diagram illustrating a change in refrigerant properties according to operation of an air conditioner to which a compressor according to a second embodiment of the present invention is applied.
7 is a view showing the arrangement of the injection hole of the compressor according to the second embodiment of the present invention.
8 is a view showing the arrangement of the injection hole of the compressor according to the third embodiment of the present invention.

DETAILED DESCRIPTION Hereinafter, specific embodiments of the present invention will be described with reference to the accompanying drawings. However, the spirit of the present invention is not limited to the embodiments presented, and those skilled in the art who understand the spirit of the present invention may have other embodiments within the scope of the same idea. Will be able to easily suggest

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to indicate the same or similar components.

1 is a system diagram showing the configuration of an air conditioner to which a compressor according to a first embodiment of the present invention is applied, and FIG. 2 is a coolant properties according to the operation of an air conditioner to which a compressor is applied according to a first embodiment of the present invention. PH diagram showing change.

1 and 2, an air conditioner 1 according to an embodiment of the present invention includes a compressor 10, a condenser 20, a first expansion device 30, and a second expansion device 35. ), An evaporator 25, and a refrigerant pipe 15.

The compressor 10 performs a function of compressing the refrigerant. The condenser 20 performs a function of condensing the refrigerant compressed by the compressor 10. The first expansion device 30 and the second expansion device 35 serve to selectively expand the refrigerant condensed in the condenser 20. The coolant pipe 15 functions to guide the flow of the coolant.

In the air conditioner 10 according to the embodiment of the present invention, cooling or heating operation may be performed according to the circulation direction of the refrigerant.

The compressor 10 may be configured to be multistage compressible. The compressor 10 may be a scroll compressor for compressing the refrigerant by a relative phase difference between the fixed scroll and the swing scroll.

The air conditioner 1 includes a plurality of subcooling devices 40, 50, 60, and 70 for supercooling the refrigerant passing through the condenser 20.

The plurality of subcooling devices 40, 50, 60, 70 may include a first subcooling device 70, a second subcooling device 60, a third subcooling device 50, and a fourth subcooling device 40. It is composed.

The first supercooling device 70 performs a function of supercooling the refrigerant passing through the first expansion device 30. The second supercooling device 60 performs a function of supercooling the refrigerant having passed through the first supercooling device 70. The third supercooling device 50 performs a function of supercooling the refrigerant having passed through the second supercooling device 60. The fourth supercooling device 40 performs a function of supercooling the refrigerant having passed through the third supercooling device 50.

The air conditioner 1 includes a first injection passage 72 and a first injection expansion part 75. The first injection passage 72 serves to bypass at least some of the refrigerant passing through the first expansion device 30. The first injection expansion unit 75 serves to adjust the amount of refrigerant bypassed through the first injection passage 72. The first injection expansion portion 75 is disposed in the flow path of the first injection passage 72. The refrigerant may be expanded in the process of passing through the first injection expansion portion 75.

The bypassed refrigerant among the refrigerants that have passed through the first expansion device 30 is referred to as a "first branched refrigerant", and the remaining refrigerants other than the branched refrigerant are referred to as "main refrigerants".

The first supercooling device 70 performs heat exchange between the main refrigerant and the first branched refrigerant.

The first branched refrigerant changes to low temperature and low pressure while passing through the first injection expansion portion 75. The first branched refrigerant absorbs heat through heat exchange with the main refrigerant. The main refrigerant radiates heat through heat exchange with the first branched refrigerant. Thus, the main refrigerant may be subcooled. The first branched refrigerant is injected into the compressor 10 through the first injection passage 72 after passing through the first supercooling device 70.

The first injection passage 72 includes a first injection inlet 71. The first injection inlet 71 is connected to the first position of the compressor 10. A more detailed description of the first position will be given later.

The air conditioner 1 includes a second injection passage 62 and a second injection expansion part 65. The second injection passage 62 serves to bypass at least some of the main refrigerant passing through the first supercooling device 70. The second injection expansion part 65 serves to adjust the amount of refrigerant bypassed through the second injection passage 62. The second injection expansion portion 65 is disposed in the flow path of the second injection passage 62. The refrigerant may be expanded in the process of passing through the second injection expansion portion 65.

The refrigerant bypassed to the second injection passage 62 is referred to as a "second branched refrigerant". The second supercooling device 60 serves to exchange heat between the main refrigerant and the second branched refrigerant.

The second branched refrigerant changes to low temperature and low pressure while passing through the second injection expansion portion 65. The second branched refrigerant is endothermic in the process of heat exchange with the main refrigerant. The main refrigerant dissipates heat during the heat exchange with the second branched refrigerant. Thus, the main refrigerant may be subcooled. The second branched refrigerant is injected into the compressor 10 through the second injection passage 62 after passing through the second supercooling device 60.

The second injection passage 62 includes a second injection inlet 61. The second injection inlet 61 is connected to the second position of the compressor 10. Here, the second position means a position different from the above-described second position. The second injection inlet 61 and the first injection inlet 71 are connected to different positions of the compressor 10.

The air conditioner 1 includes a third injection passage 52 and a third injection expansion part 55. The third injection passage 52 serves to bypass at least some of the main refrigerant passing through the second supercooling device 60. The third injection expansion unit 55 serves to adjust the amount of refrigerant bypassed through the third injection passage 52. The third injection expansion part 55 is disposed in the flow path of the third injection passage 52. The refrigerant may be expanded in the process of passing through the third injection expansion part 55.

The refrigerant bypassed to the third injection passage 52 is referred to as "third branched refrigerant". The third supercooling device 50 serves to exchange heat between the main refrigerant and the third branched refrigerant. The third branched refrigerant changes to low temperature and low pressure while passing through the third injection expansion part 55. The third branched refrigerant absorbs heat in the process of heat exchange with the main refrigerant. The main refrigerant radiates heat during the heat exchange process with the third branched refrigerant. Accordingly, the main refrigerant may be subcooled, and the third branched refrigerant is injected into the compressor 10 through the third injection passage 52 after passing through the third subcooling apparatus 50.

The third injection passage 52 includes a third injection inlet portion 51.

The third injection inlet 51 is connected to a third position of the compressor 10. The third position means a position different from the above-described first position and second position.

The air conditioner 1 includes a fourth injection passage 42 and a fourth injection expansion part 45. The fourth injection passage 42 serves to bypass at least some of the main refrigerant passing through the third supercooling device 50. The fourth injection expansion part 45 serves to adjust the amount of refrigerant bypassed to the fourth injection passage 42. The fourth injection expansion part 45 is disposed in the flow path of the fourth injection passage 42. The refrigerant may be expanded in the process of passing through the fourth injection expansion part 45.

The refrigerant bypassed to the fourth injection passage 42 is referred to as "fourth branched refrigerant". The fourth supercooling device 40 serves to exchange heat between the main refrigerant and the fourth branched refrigerant. The fourth branched refrigerant changes to low temperature and low pressure while passing through the fourth injection expansion part 45. The fourth branched refrigerant absorbs heat in the process of heat exchange with the main refrigerant. The main refrigerant is radiated in the process of being exchanged with the fourth branched refrigerant. Accordingly, the main refrigerant may be subcooled, and the fourth branched refrigerant is injected into the compressor 10 through the fourth injection passage 42 after passing through the fourth subcooler 40.

The fourth injection passage 42 includes a fourth injection inlet portion 41. The fourth injection inlet portion 41 is connected to the fourth position of the compressor 10. The fourth position means a position different from the above-described first position, second position, and third position.

The refrigerant passing through the fourth supercooling device 40 expands while passing through the second expansion device 35, and then flows into the evaporator 25. The refrigerant introduced into the evaporator 25 is sucked into the compressor through the suction part of the compressor 10 after being evaporated in the evaporator 25.

1 and 2 together, a P-H (pressure-enthalpy) diagram of a refrigerant system circulating an air conditioner will be described.

The refrigerant (A state) sucked into the compressor 10 is compressed by the compressor 10 and injected into the compressor 10 through a fourth injection inlet 41 connected to the fourth injection passage 42. Mixed with refrigerant. The mixed refrigerant represents the state of B.

The process in which the refrigerant is compressed from the A state to the B state is referred to as "single stage compression".

The refrigerant in the B state is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the third injection inlet 51 connected to the third injection passage 52. The mixed refrigerant shows the state of C.

The process by which the refrigerant is compressed from the B state to the C state is referred to as "two stage compression".

The refrigerant in the C state is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the second injection inlet 61 connected to the second injection passage 62. The mixed refrigerant is D It becomes the state of.

The process by which the refrigerant is compressed from the C state to the D state is referred to as "three stage compression".

The refrigerant in the state D is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the first injection inlet 71 connected to the first injection passage 72. It becomes the state of.

The process by which the refrigerant is compressed from the D state to the E state is referred to as "four stage compression".

The refrigerant in the E state is compressed again, and the compressed refrigerant represents the F state.

The process by which the refrigerant is compressed from the E state to the F state is referred to as "five stage compression".

Then, the refrigerant is introduced into the condenser 20 in the state of F. When the refrigerant is discharged from the condenser 20, the state of G is shown.

Some of the main refrigerants in the G state (first branched refrigerant) passing through the condenser 20 are bypassed and flow into the first injection expansion part 75. The first branched refrigerant passes through the first injection expansion part 75 and expands into a P state. The first branched refrigerant in the P state is heat-exchanged with the main refrigerant in the G state and the first supercooling device 70. Through the heat exchange, the main refrigerant in the G state is supercooled to the H state. The first branched refrigerant in the P state is injected into the compressor 10 and mixed with the refrigerant in the compressor 10 to be in the E state.

Some of the H state main refrigerants (the second branched refrigerants) passing through the first supercooling device 70 are bypassed and flow into the second injection expansion part 65. The second branched refrigerant passes through the second injection expansion part 65 and expands into an O state. The second branched refrigerant in the O state exchanges heat with the main refrigerant in the H state and the second supercooling device 60. Through the heat exchange, the main refrigerant in the H state is supercooled to the I state. The second branched refrigerant in the O state is injected into the compressor 10 and mixed with the refrigerant in the compressor 10 to be in the D state.

Some of the main refrigerants in the I state (third branched refrigerant) passing through the second supercooling device 60 are bypassed and flow into the third injection expansion part 55. The third branched refrigerant passes through the third injection expansion part 55 and expands to N state. The third branched refrigerant in the N state is exchanged with the main refrigerant in the I state with the third supercooler 50. Through the heat exchange, the main refrigerant in the I state is supercooled to the J state. The third branched refrigerant in the N state is injected into the compressor 10 and then mixed with the refrigerant in the compressor 10 to be in the C state.

Some of the main refrigerants in the J state (the fourth branched refrigerant) passing through the third supercooling device 50 are bypassed and flow into the fourth injection expansion part 45. The fourth branched refrigerant passes through the fourth injection expansion part 45 and expands into the M state. The fourth branched refrigerant in the M state exchanges heat with the main refrigerant in the J state and the fourth supercooler 40. Through heat exchange, the main refrigerant in the J state is supercooled to the K state. The fourth branched refrigerant in the M state is injected into the compressor 10 and then mixed with the refrigerant in the compressor 10 to be in the B state.

The main refrigerant having a K state passing through the fourth supercooling device 40 is expanded by the second expansion device 35 to be in an L state. The refrigerant expanded in the L state flows into the evaporator 25. The refrigerant heat exchanged in the evaporator 25 is in an A state. The refrigerant in the state A flows into the compressor 10.

Hereinafter, the pressure of the diagram connecting F-K is called "high pressure." The pressure of the lead connecting the E-Ps (ie, the pressure in the first injection passage 72) is referred to as "first intermediate pressure". The pressure of the lead connecting the D-O (the pressure in the second injection passage 62) is referred to as the "second intermediate pressure". The pressure of the lead connecting the C-Ns (the pressure in the third injection passage 52) is referred to as "third intermediate pressure". The pressure of the lead connecting the B-M (the pressure in the fourth injection passage 42) is referred to as "fourth intermediate pressure". The pressure in the diagram connecting A-L is referred to as "low pressure".

The magnitude of the pressure becomes a relationship of 'high pressure> first intermediate pressure> second intermediate pressure> third intermediate pressure> fourth intermediate pressure> low pressure'.

The flow rate Q1 injected through the first injection passage 72 may be proportional to the difference between the high pressure and the first intermediate pressure. The flow rate Q2 injected through the second injection passage 62 may be proportional to the difference pressure between the high pressure and the second intermediate pressure. The flow rate Q3 injected through the third injection passage 52 may be proportional to the difference pressure between the high pressure and the third intermediate pressure. The flow rate Q4 injected through the fourth injection passage 42 may be proportional to the difference pressure between the high pressure and the third intermediate pressure.

Therefore, in order to increase the injected flow rate, it is preferable to form the first intermediate pressure, the second intermediate pressure, the third intermediate pressure, or the fourth intermediate pressure close to the low pressure side.

3 is a cross-sectional view showing a compressor according to a first embodiment of the present invention.

The scroll compressor according to the embodiment of the present invention includes a casing 210, a drive motor 220, a compression unit 200, and a rotation shaft 226.

The casing 210 has an inner space. The drive motor 220 is disposed above the inner space. The compression unit 200 is disposed below the drive motor 220. The rotary shaft 226 serves to transfer the driving force of the drive motor 220 to the compression unit 200.

The inner space of the casing 210 is disposed in the first space V1, which is the upper side of the drive motor 220, the second space V2, which is between the drive motor 220 and the compression unit 200, and the discharge cover 270. It is divided into a third space (V3) partitioned by the oil storage space (V4) of the lower side of the compression unit 200.

Casing 210 may include an upper shell 212, a cylindrical shell 211 and a lower shell 214. An upper shell 212 may be installed at an upper portion of the cylindrical shell 211, and a lower shell 214 may be installed at a lower portion of the cylindrical shell 211.

The upper shell 212 may be provided with a refrigerant discharge pipe 216. The refrigerant discharge pipe 216 provides a path for discharging the refrigerant in the first space V1 to the outside of the compressor.

The lower shell 214 may form a low oil space V4 through which oil can be stored. The oil storage space V4 performs the function of an oil chamber for supplying oil.

The refrigerant suction pipe 218 may be installed at the side of the cylindrical shell 211. The refrigerant suction pipe 218 provides a path through which the refrigerant to be compressed is introduced. The refrigerant suction pipe 218 is connected to the suction part 256 of the compression unit 200.

The drive motor 220 may be disposed above the inner space of the casing 210. The drive motor 220 includes a stator 222 and a rotor 224. The stator 222 may be fixed to the casing 210. The stator 222 may include a wound coil 222a. The coolant flow path groove 212a may be formed on an outer circumferential surface of the stator 222. The refrigerant passage groove 212a provides a path through which the refrigerant (or refrigerant mixed with oil) discharged from the compression unit 200 passes.

The rotor 224 is coupled to the inside of the stator 222 to generate rotational power. The rotating shaft 226 is coupled to the center of the rotor 224. The rotating shaft 226 rotates with the rotor 224. The rotating shaft 226 transmits the rotating power of the rotor 224 to the compression unit 200.

The compression unit 200 may include an old dam ring 150, a main frame 230, a fixed scroll 250, a swing scroll 240, and a discharge cover 270.

The old dam ring 150 may be installed between the main frame 230 and the swing scroll 240. The old dam ring 150 is coupled to the main frame 230 and the pivoting scroll 240 to prevent rotation of the pivoting scroll 240.

The main frame 230 is disposed below the drive motor 220. The main frame 230 forms an upper portion of the compression unit 200. The main frame 230 includes a frame hard plate portion 232, a frame bearing portion 232a (hereinafter referred to as a first bearing portion), and a frame sidewall portion (hereinafter referred to as a first sidewall portion) 231.

The frame plate portion 232 has a substantially disc shape. The first bearing part 232a is provided at the center of the frame plate part 232. The first side wall portion 231 has a shape protruding downward from the outer circumferential portion of the frame plate portion 232 (direction toward the fixed scroll).

The outer circumferential portion of the first sidewall portion 231 may face the inner circumferential surface of the cylindrical shell 211. The first sidewall part 231 may face an upper end of the fixed scroll sidewall part 255, which will be described below.

The first sidewall part 231 may include a frame discharge hole (hereinafter, referred to as a first discharge hole) 231a. The first discharge hole 231a is formed to penetrate the inside of the first sidewall portion 231 in the axial direction. It serves to provide a passage through which the first discharge hole (231a) moves. An inlet of the first discharge hole 231a is connected to an outlet of the fixed scroll discharge hole 256b to be described later. The outlet of the first discharge hole 231a is connected to the second space V2.

The first bearing part 232a may protrude from the upper surface of the frame plate 232 to the driving motor 220. The first bearing portion 232a may include a bearing portion that supports the main bearing portion 226c of the rotation shaft 226.

The back pressure chamber S2 is formed between the turning scroll 240 and the main frame 230. The back pressure chamber S2 may be an intermediate pressure region (ie, an intermediate pressure chamber). The oil supply passage 226a described later provided on the rotating shaft 226 may be in a high pressure state in which the pressure is higher than that of the back pressure chamber S2.

The fixed scroll 250 may be coupled to the bottom of the main frame 230. The fixed scroll 250 includes a fixed scroll hard plate portion 254, a fixed scroll side wall portion 255, a fixed wrap 251, and a fixed scroll bearing portion 252.

The fixed scroll plate portion 254 has a substantially disc shape. The fixed scroll side wall portion 255 has a shape protruding upward from the outer circumferential portion of the fixed scroll hardboard portion 254 (direction toward the main frame).

The fixed wrap 251 is formed to protrude from the upper surface of the fixed scroll hard plate portion 254. The fixed wrap 251 is engaged with the swing wrap 241 of the swing scroll 240 to be described later to form a compression chamber S1. The fixed scroll bearing 252 serves to support the rotating shaft 226 through.

The fixed scroll plate 254 may have a discharge port 253. The discharge port 253 provides a path through which the compressed refrigerant moves from the compression chamber S1 to the internal space V3 of the discharge cover 270.

The discharge cover 270 may be sealingly coupled to the bottom of the fixed scroll 250. The discharge cover 270 separates the discharge flow path of the refrigerant and the storage space V4. The discharge cover 270 may include a through hole 276 penetrating the oil feeder 271. The oil feeder 271 is arranged to be immersed in the oil storage space V4 in the oil storage space V4.

The fixed scroll side wall portion 255 has an outer circumferential portion in contact with the inner circumferential surface of the cylindrical shell 211. The fixed scroll sidewall portion 255 has an upper end in contact with a lower end of the main frame sidewall 231.

The fixed scroll side wall portion 255 may include a fixed scroll discharge hole 256b. The fixed scroll discharge hole 256b is formed to penetrate the inside of the fixed scroll side wall portion 255 in the axial direction. The fixed scroll discharge hole 256b provides a passage through which the refrigerant moves together with the main frame discharge hole 231a.

The fixed scroll discharge hole 256b communicates with the main frame discharge hole 231a. The inlet of the fixed scroll discharge hole 256b is connected to the internal space V3 of the discharge cover 270. The fixed scroll discharge hole 256b and the main frame discharge hole 231a provide a path through which the refrigerant in the third space V3 moves to the second space V2.

The second bearing portion 252 may protrude from the lower surface of the fixed scroll plate 254 toward the storage space V4. The second bearing portion 252 may have a bearing for supporting the rotating shaft 226 to be penetrated.

The pivoting scroll 240 is disposed between the main frame 230 and the fixed scroll 250. The swinging scroll 240 may be coupled to the rotating shaft 226 to form a plurality of compression chambers S1 with the fixed scroll 250 while pivoting.

The swing scroll 240 may include a swing scroll hard plate portion 245, a swing wrap 241, and a rotation shaft coupling portion 242.

The swing scroll hard plate portion 245 has a substantially disc shape. The swing wrap 241 is formed to protrude from the lower surface of the swing scroll plate 245. The pivot wrap 241 is engaged with the fixed wrap 251 to form a compression chamber. The rotating shaft coupling portion 242 is disposed at the center of the turning scroll plate 245. The rotary shaft coupling portion 242 is coupled to the eccentric portion 226f to be described later of the rotary shaft 226.

The outer circumferential portion of the swinging scroll hard plate portion 245 is supported at the upper end of the fixed scroll side wall portion 255. The lower end of the turning wrap 241 is in close contact with the upper surface of the fixed scroll hard plate portion 254 is supported.

The outer circumferential portion of the rotating shaft coupling portion 242 is connected to the turning wrap 241 to form a compression chamber S1 together with the fixed wrap 251 in the compression process. The fixed wrap 251 and the swing wrap 241 may be formed in an involute curve shape. The fixed wrap 251 and the swing wrap 241 may be formed in various other shapes. Here, the involute curve shape means a curve corresponding to the trajectory that the end of the yarn draws when unwinding the yarn wound around the base circle having an arbitrary radius.

The rotary shaft 226 may include an oil supply passage 226a for guiding oil contained in the oil storage space V4 of the casing 210 to the top.

The rotating shaft 226 includes a main bearing portion 226c, a sub bearing portion 226g, and an eccentric portion 226f. The main bearing part 226c passes through the first bearing part 232a of the main frame 230 and is supported by the first bearing part 232a. The sub bearing portion 226g penetrates through the second bearing portion 252 of the fixed scroll 250 and is supported by the second bearing portion 252. The eccentric portion 226f is rotatably coupled to the rotational shaft coupling portion 242 of the swinging scroll 240.

The main bearing portion 226c and the sub bearing portion 226g are formed on the coaxial line so as to have the same axis center. The eccentric part 226f may be formed to be radially eccentric with respect to the main bearing part 226c (or the sub bearing part 226g).

An oil supply passage 226a may be formed in the rotation shaft 226 to supply oil in the oil storage space V4 to the outer circumferential surface of each bearing portion 226c and 226g and the outer circumferential surface of the eccentric portion 226f. In addition, an oil hole penetrating from the oil supply passage 226a to the outer circumferential surface may be formed in the bearing portion and the eccentric portions 226c, 226g, and 226f of the rotation shaft 226. The oil guided upward through the oil supply passage 226a may be discharged through the oil hole and supplied to the bearing surface.

An oil feeder 271 for pumping oil filled in the oil storage space V4 may be coupled to a lower end of the sub bearing part 226g. The oil feeder 271 may include an oil supply pipe 273 and an oil suction member 274. The oil supply pipe 273 is coupled to the oil supply passage 226a of the rotation shaft 226. The oil supply pipe 273 may be disposed to pass through the through hole 276 of the discharge cover 270 to be immersed in the oil storage space V4. The oil suction member 274 is inserted into the oil supply pipe 273. The oil suction member 274 operates like a propeller and serves to suck oil.

The balance weight 227 may be coupled to the rotor 224 or the rotating shaft 226. The balance weight 227 serves to reduce noise and vibration generated during rotation.

Operation of the scroll compressor according to an embodiment of the present invention is as follows.

The drive motor 220 rotates the rotor 224. The rotating shaft 226 rotates together with the rotor 224. At this time, the swinging scroll 240 coupled to the rotating shaft 226 makes a pivoting movement with respect to the fixed scroll 250. Due to the change in the relative position of the swing scroll 240 and the fixed scroll 250, the compression chamber S1 formed between the swing wrap 241 and the fixed wrap 251 narrows the volume and compresses the refrigerant.

Meanwhile, the coolant may directly flow into the compression chamber S1 supplied through the coolant suction pipe 218 from the outside of the casing 210. The refrigerant is compressed in the compression chamber S1 by the swinging motion of the swinging scroll 240 and then discharged to the third space V3 through the discharge port 253 of the fixed scroll 250. The refrigerant discharged into the third space V3 moves to the second space V2 through the second discharge hole 256b and the first discharge hole 231a. The refrigerant in the second space V2 is discharged to the outside of the casing 210 through the refrigerant discharge pipe 216.

On the other hand, the compressor according to the first embodiment of the present invention has a structure in which the injection inlet portion is coupled to the fixed scroll hard plate portion 254 through the casing (210). In FIG. 3, the first injection inlet 71 and the suction unit 256 are shown as side-by-side arrangement in order to show both the first injection inlet 71 and the suction unit 256. However, this is for convenience of illustration and the first injection inlet 71 is disposed at a position having a predetermined angle from the suction unit 256.

The first injection inlet 71 passes through the fixed scroll plate 254 and is connected to an injection hole (H4 in FIG. 4) formed in the fixed scroll plate 254. The injection hole is connected to the compression chamber and can be opened and closed according to the movement of the turning wrap 241.

Although not shown in the cross-sectional view, the second injection inlet 61, the third injection inlet 51, and the fourth injection inlet 41 also pass through the casing 210 to fix the scroll plate of the fixed scroll 250. Connected to the unit 254. Each injection inlet is connected to an injection hole connected to the compression chamber.

The compressor according to the first embodiment of the present invention includes a first injection inlet 71, a second injection inlet 61, a third injection inlet 51 and a fourth injection inlet 41. Include.

The first injection inlet 71 serves to inject the refrigerant flowing through the first injection passage 72 into the compressor. The second injection inlet 61 serves to inject the refrigerant flowing through the second injection passage 62 into the compressor. The third injection inlet 51 serves to inject the refrigerant flowing through the third injection passage 52 into the compressor. The fourth injection inlet 41 serves to inject the refrigerant flowing through the fourth injection passage 42 into the compressor. The first to fourth injection inlets 71, 61, 51, and 41 may be spaced apart from each other to be coupled to the casing 210, respectively.

The first injection inlet 71 may pass through the casing 210 at one side of the casing 210 and may be coupled into the fixed scroll 250. The second injection inlet 61 may pass through the casing 210 at the other side of the casing 210 and may be coupled to the inside of the fixed scroll 250. The third injection inlet 51 and the fourth injection inlet 41 may also be coupled to the inside of the fixed scroll 250 through the casing 210 at another side of the casing 210, respectively. .

The first to fourth injection inlets 71, 61, 51, and 41 may be spaced apart from each other by an angle set based on the compression direction (or opposite compression direction) of the refrigerant. The fixed scroll 250 includes a plurality of injection holes H1, H2, H3, and H4 for injecting refrigerant into the plurality of compression chambers.

The plurality of injection holes H1, H2, H3, and H4 may include a first injection hole H1, a second injection hole H2, a third injection hole H3, and a fourth injection hole H1. Include.

The first injection hole H1 communicates with the fourth injection inlet portion 41. The second injection hole H2 communicates with the third injection inlet 51. The third injection hole H3 communicates with the second injection inlet 61. The fourth injection hole H4 communicates with the first injection inlet 71.

When the pivoting scroll 240 is turned, the pivoting scroll pivoting wrap 241 has the first injection hole H1, the second injection hole H2, the third injection hole H3, and the fourth injection The hole H4 is selectively opened and closed.

In the compression process of the refrigerant, the refrigerant of the first to fourth injection passages (72, 62, 52, 42) is the first injection inlet 71, the second injection inlet 61, the third injection inlet ( 51) or through the fourth injection inlet portion 41 is selectively injected into the plurality of compression chambers.

In the process of turning the turning scroll 240, the turning wrap 241 is the first injection hole (H1), the second injection hole (H2), the third injection hole (H3) or the fourth injection hole (H4) Move to selectively open (or close).

When the first injection hole H1, the second injection hole H2, the third injection hole H3, or the fourth injection hole H4 is opened, the refrigerant may be injected into the compression chamber.

The refrigerant injected through the fourth injection inlet 41 forms a fourth intermediate pressure. The refrigerant forming the fourth intermediate pressure may be injected into the compression chamber before the refrigerant is compressed much in the compression chamber.

The refrigerant injected through the third injection inlet 51 forms a third intermediate pressure (greater than the fourth intermediate pressure). The refrigerant forming the third intermediate pressure may be injected into the compression chamber in which the refrigerant is compressed more than the compression chamber when the third intermediate pressure is injected through the fourth injection inlet 41.

The refrigerant injected through the second injection inlet 61 forms a second intermediate pressure (greater than the third intermediate pressure). The refrigerant forming the second intermediate pressure may be injected into the compression chamber in which the refrigerant is compressed more than the compression chamber when the second intermediate pressure is injected through the third injection inlet 51.

The refrigerant injected through the first injection inlet 71 forms a first intermediate pressure (greater than the second intermediate pressure). The refrigerant forming the first intermediate pressure may be injected into the compression chamber in which the refrigerant is compressed more than the compression chamber when the refrigerant is injected through the second injection inlet 61.

The first injection hole H1 is disposed at a position relatively farthest from the discharge port 253 in the radial direction. The second injection hole H2 is disposed at a position closer than the first injection hole H1 in the radial direction from the discharge port 253. The third injection hole H3 is disposed at a position closer than the second injection hole H2 in the radial direction from the discharge port 253. The fourth injection hole H4 is disposed at a position closer than the third injection hole H3 in the radial direction from the discharge port 253.

Depending on the positions of the first to fourth injection holes H1, H2, H3 and H4, opening and closing of the first to fourth injection holes H1, H2, H3 and H4 when the refrigerant is injected into the compression chamber varies. Can be. In other words, changing the position of the injection hole changes the opening and closing time of the injection hole.

The embodiment of the present invention specifies the arrangement position of each injection hole on the basis of the time point at which the suction of the refrigerant through the refrigerant suction unit 256 is completed (crank angle 0 °).

4 is a view showing the arrangement of the injection hole of the compressor according to the first embodiment of the present invention.

The illustrated compressor has a structure in which the compression chamber is compressed while rotating in a counterclockwise direction. The fourth injection inlet 41, the third injection inlet 51, the second injection inlet 61, and the first injection inlet 71 may be sequentially disposed along the movement path of the compression chamber.

The injection hole is referred to as a first injection hole H1, a second injection hole H2, a third injection hole H3, and a fourth injection hole H4 along the movement path of the compression chamber. Accordingly, the first injection hole H1 is connected to the fourth injection inlet 41, the second injection hole H2 is connected to the third injection inlet 51, and the third injection hole H3 is It is connected to the second injection inlet 61, the fourth injection hole (H4) is connected to the first injection inlet (71).

The first injection hole H1 may be disposed at a position in which the reference line L1 is rotated by a first predetermined angle θ1 in the clockwise direction with respect to the center of the rotation axis. The illustrated compressor has a structure in which a compression chamber is compressed while rotating in a counterclockwise direction. The clockwise direction is the direction opposite to the compression chamber rotation direction based on the rotation direction of the compression chamber.

The first set angle θ1 is formed in a range of 61 ° to 101 °. When the first injection hole H1 is at the position of the first set angle θ1, the opening of the first injection hole H1 starts after the suction of the refrigerant is completed.

When the intake of the coolant through the coolant suction unit 256 is completed, the rotation angle of the rotation shaft is 0 °, the opening of the first injection hole H1 is from -101 ° to the rotation angle of the rotation shaft. It starts at -61 °.

The range of the first set angle θ1 corresponds to a range of -101 ° to -61 ° based on the rotation angle of the rotation shaft. The suction of the refrigerant is completed when the rotation angle of the rotation shaft 226 is 0 °. As the rotation angles increase to 10 ° and 20 °, the opening degree of the first injection hole H1 gradually increases, so that injection may be further performed, and compression of the refrigerant may be continuously performed. The compression of the refrigerant corresponds to the "single stage compression" described above.

The opening of the injection hole means that the injection hole is exposed to the inside of the compression chamber while the injection hole is released from the turning wrap.

The injection hole is slowly opened over a predetermined time and the refrigerant is compressed together in the compression chamber at the moment of injection.

The second injection hole H2 may be formed at a position rotated by a second set angle θ2 in a counterclockwise direction from the position of the first injection hole H1. The second set angle θ2 may be in a range of 75 ° to 115 °.

When the first injection hole H1 and the second injection hole H2 have a 180 ° retardation with each other, a compression chamber through which the refrigerant is injected through the first injection hole H1 and the second injection hole H2 Compression chambers through which refrigerant is injected may be separated from each other.

When the first injection hole H1 and the second injection hole H2 have a 180 ° phase difference from each other, when the second injection hole H2 is opened, the first injection hole H1 is the turning scroll wrap. It can be shielded by. When the first injection hole H1 and the second injection hole H2 are disposed to have a phase of more than 180 ° from each other, the injection hole overlapping phenomenon in which injection of refrigerants having different intermediate pressures is simultaneously performed in the same compression chamber is prevented. can do.

When the injection of the refrigerant is to be made four or more times before the discharge after the suction of the refrigerant as in the present embodiment, the first injection hole H1 and the second injection hole H2 have a phase difference of 180 ° or more from each other. It is difficult to arrange so that.

When the first injection hole H1 and the second injection hole H2 are disposed with a phase difference of 180 ° or more from each other, the last injection hole (fourth injection hole H4 in the present embodiment) and the second embodiment described later This is because the position of the 5 injection hole H5 is disposed too close to the discharge port 253 side. If the last injection hole is disposed too close to the discharge port 253, a problem may occur in which the refrigerant in the compression chamber may flow back to the last injection hole.

The present embodiment is to minimize the deterioration of the compressor by reducing the degree of overlap even if the injection hole overlapping phenomenon occurs, it is preferable to limit the rotation angle of the rotating shaft during the overlap of the injection hole to a maximum of 50 °.

When the second injection hole H2 starts to open, when the first injection hole H1 is in an open state and the rotation axis is further rotated by a predetermined angle after the second injection hole H2 is opened. The first injection hole H1 may be closed. That is, overlapping of the first injection hole H1 and the second injection hole H2 may occur.

The present invention may further include a check valve or an opening / closing valve in the injection inlet connected to the injection hole in order to suppress the refrigerant backflow due to the overlap of the injection hole.

By arranging the check valve at the injection inlet, it is possible to prevent the backflow of the refrigerant during the injection hole overlap.

In addition, when the on-off valve is arranged at the injection inlet, the on-off valve can be interrupted at an appropriate time. Even when the injection hole is opened from the turning wrap by interrupting the on / off valve, the on / off valve can be closed to prevent backflow of the refrigerant. At this time, the interruption of the on-off valve may be made according to the rotation angle of the rotary shaft. In addition, by setting the opening time of the on-off valve, it is possible to more precisely control the flow rate of the refrigerant flowing into the compression chamber.

In the process of injecting the refrigerant through the second injection hole H2, the compression of the compression chamber is continuously performed. At this time, the compression of the refrigerant corresponds to "two stage compression".

The third injection hole H3 may be disposed at a position rotated counterclockwise by a third set angle θ3 from the position of the second injection hole H2. The third set angle θ3 may be set in a range of 60 ° to 90 °. The range of the third set angle θ3 may be understood as a value determined in consideration of the injection hole overlapping phenomenon described above. Meanwhile, in the process of injecting the refrigerant through the third injection hole H3, the compression of the compression chamber is continuously performed. At this time, the compression of the refrigerant corresponds to "three-stage compression".

The fourth injection hole H4 may be disposed at a position rotated counterclockwise by a third set angle θ4 from the position of the third injection hole H3. The fourth set angle θ4 may be set in a range of 60 ° to 100 °. The range of the third set angle θ3 may be understood as a value determined in consideration of the injection hole overlapping phenomenon described above. Meanwhile, in the process of injecting the refrigerant through the fourth injection hole H4, the compression of the compression chamber is continuously performed. At this time, the compression of the refrigerant corresponds to "four-stage compression".

After the injection of the refrigerant through the fourth injection hole H4 is completed (that is, after the fourth injection hole H4 is closed), the compression chamber may be further compressed while rotating counterclockwise. At this time, the compression of the refrigerant corresponds to "five stage compression".

The refrigerant in which 5-stage compression is completed may be discharged to the outside of the fixed scroll through the discharge port 253.

The location of the injection hole is as follows. When the line connecting the center of the rotation axis and the center of the suction unit is viewed as the reference line L1, the position of the first injection hole H1 is disposed at a position rotated 61 ° to 101 ° clockwise from the reference line L1. Can be. The second injection hole H2 may be disposed at a position rotated 75 ° to 115 ° counterclockwise from the first injection hole H1. The third injection hole H3 may be disposed at a position rotated by 60 ° to 90 ° counterclockwise from the second injection hole H2. The fourth injection hole H4 may be disposed at a position of 60 ° to 100 ° in the counterclockwise direction from the third injection hole H3.

5 is a system diagram showing the configuration of an air conditioner to which a compressor according to a second embodiment of the present invention is applied, and FIG. 6 is a refrigerant property value according to the operation of the air conditioner to which the compressor is applied according to a second embodiment of the present invention. FIG. 7 is a diagram showing the change, and FIG. 7 is a view showing the arrangement of injection holes of the compressor according to the second embodiment of the present invention.

The compressor according to the second embodiment of the present invention has a structure in which six stage compression is performed by providing five injection inlets.

Referring to FIG. 5, the fifth supercooling device 80 and the fifth injection expansion unit 85 are arranged between the fourth supercooling device 40 and the second expansion device 35 in the configuration of the air conditioner of FIG. 1. The fifth injection passage 82 and the fifth injection inlet 81 are further included.

5 and 6, the P-H (pressure-enthalpy) diagram of the refrigerant system circulating through the air conditioner 2 to which the compressor according to the second embodiment of the present invention is applied will be described.

The refrigerant (A state) sucked into the compressor 10 is compressed by the compressor 10 and injected into the compressor 10 through a fifth injection inlet 81 connected to the fifth injection passage 82. Mixed with refrigerant. The mixed refrigerant shows the state of Q.

The process of compressing the refrigerant from the A state to the Q state may be referred to as "single stage compression".

The refrigerant in the Q state is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the fourth injection inlet 41 connected to the fourth injection passage 42. The mixed refrigerant represents the state of B.

The process of compressing the refrigerant from the Q state to the B state may be referred to as "two stage compression".

The refrigerant in the B state is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the third injection inlet 51 connected to the third injection passage 52. The mixed refrigerant shows the state of C.

The process in which the refrigerant is compressed from the B state to the C state may be referred to as "three stage compression".

The refrigerant in the C state is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the second injection inlet 61 connected to the second injection passage 62. The mixed refrigerant is D It becomes the state of.

The process in which the refrigerant is compressed from the C state to the D state may be referred to as "four-stage compression".

The refrigerant in the state D is compressed again, and the compressed refrigerant is mixed with the refrigerant injected into the compressor 10 through the first injection inlet 71 connected to the first injection passage 72. It becomes the state of.

The process in which the refrigerant is compressed from the D state to the E state may be referred to as "five stage compression."

The refrigerant in the E state is compressed again, and the compressed refrigerant represents the F state.

The process of compressing the refrigerant from the E state to the F state may be referred to as "six stage compression". The coolant flows into the condenser 20 in the state of F, and when discharged from the condenser 20, the state of G is represented.

The refrigerant (first branched refrigerant), which has been bypassed among the refrigerant passing through the condenser 20 and has passed through the first injection expansion portion 75, is expanded (P state) and is heat-exchanged with the main refrigerant in the G state.

In this process, the main refrigerant in the G state is supercooled to the H state, and the first branched refrigerant in the P state is injected into the compressor 10, and then mixed with the refrigerant in the compressor 10 to be in the E state.

Among the main refrigerants (H state) passing through the first supercooling device 70, the refrigerants (by the second branched refrigerant) that have passed through the second injection expansion part 65 are expanded to an O state, and It is heat exchanged.

In this process, the main refrigerant in the H state is supercooled to the I state, and the second branched refrigerant in the O state is injected into the compressor 10, and then mixed with the refrigerant in the compressor 10 to be in the D state.

The refrigerant (third branched refrigerant) which has passed through the second supercooling device 60 and has been bypassed among the main refrigerants supercooled in the I state and has passed through the third injection expansion portion 55 is expanded to the N state, and the main refrigerant Heat exchange with

In this process, the main refrigerant of the I state is supercooled to the J state, and the third branched refrigerant of the N state is injected into the compressor 10, and then mixed with the refrigerant in the compressor 10 to be in the C state.

The refrigerant (the fourth branched refrigerant) which has passed through the third supercooling device 50 and has been bypassed among the main refrigerants supercooled in the J state and passed through the fourth injection expansion part 45 is expanded to the M state, and the main refrigerant Heat exchange with

In this process, the main refrigerant in the J state passes through the fourth supercooler 40 and is subcooled to the K state, and the fourth branched refrigerant in the M state is injected into the compressor 10, and then the refrigerant of the compressor 10 is cooled. Mixed with and the B state.

The refrigerant (the fifth branched refrigerant) that has passed through the fourth supercooling device 40 and has been bypassed among the main refrigerants supercooled in the K state and passed through the fifth injection expansion part 85 is expanded to the L state, and the main refrigerant Heat exchange with

In this process, the main refrigerant in the K state passes through the fifth supercooling device 80 and is subcooled to the R state, and the fifth branched refrigerant in the L state is injected into the compressor 10, and then the refrigerant of the compressor 10. It is mixed with and becomes Q state.

 The main refrigerant in the R state is expanded in the second expansion device 35 to represent the S state and flows into the evaporator 25. The refrigerant heat-exchanged in the evaporator 25 represents the state A, and flows into the compressor 10.

On the other hand, the pressure of the lead connecting FR is called "high pressure", and the pressure of the lead connecting EP (the pressure in the first injection passage 72) is called "first intermediate pressure" and the lead connecting DO. The pressure (pressure in the second injection passage 62) is "second medium pressure", and the leading pressure (pressure in the third injection passage 52) connecting CN is "third intermediate pressure", and BM The pressure of the lead connecting (the pressure in the fourth injection passage 42) is "fourth medium pressure", and the pressure of the lead connecting the QL (pressure in the fifth injection passage 82) is "the fifth intermediate pressure". It is called.

The pressure in the diagram connecting A-S is referred to as "low pressure". The magnitude of the pressure becomes a relationship of 'high pressure> first intermediate pressure> second intermediate pressure> third intermediate pressure> fourth intermediate pressure> fifth intermediate pressure> low pressure.

The flow rate Q1 injected through the first injection passage 72 may be proportional to the difference pressure between the high pressure and the first intermediate pressure. The flow rate Q2 injected through the second injection passage 62 may be proportional to the difference pressure between the high pressure and the second intermediate pressure. The flow rate Q3 injected through the third injection passage 52 may be proportional to the difference pressure between the high pressure and the third intermediate pressure. The flow rate Q4 injected through the fourth injection passage 42 may be proportional to the difference pressure between the high pressure and the fourth intermediate pressure. The flow rate Q5 injected through the fifth injection passage 82 may be proportional to the difference pressure between the high pressure and the fourth intermediate pressure.

Referring to FIG. 7, the illustrated compressor has a structure in which the compression chamber is rotated in a counterclockwise direction and compressed. Moving along the path of the compression chamber, the fifth injection inlet 81, the fourth injection inlet 41, the third injection inlet 51, the second injection inlet 61, and the first injection inlet ( 71) may be arranged in order.

Each injection inlet is connected to an injection hole connected to the compression chamber. The order of the injection holes is the first injection hole H5, the second injection hole H6, the third injection hole H7, the fourth injection hole H8, and the fifth injection hole H9 along the path of the compression chamber. It is called.

The first injection hole H5 is connected to the fifth injection inlet 81, the second injection hole H6 is connected to the fourth injection inlet 41, and the third injection hole H7 is connected to the third injection hole H7. It is connected to the injection inlet 51, the fourth injection hole (H8) is connected to the second injection inlet (61), the fifth injection hole (H9) is connected to the first injection inlet (71).

The first injection hole H5 may be disposed at a position in which the reference line L1 is rotated by the first set angle θ5 in the clockwise direction with respect to the center of the rotation axis. The first set angle θ1 is formed in a range of 61 ° to 101 °, and the first injection hole H5 connected to the fifth injection inlet 81 is positioned at the first set angle θ5. If in, the opening of the first injection hole (H5) begins after the suction of the refrigerant is completed.

The range of the first set angle θ1 corresponds to a range of −101 ° to −61 ° based on the rotation angle of the rotation shaft. Compression of the compression chamber is continuously performed in the process of injecting the refrigerant through the first injection hole (H5). At this time, the compression of the refrigerant corresponds to the "single stage compression" described above.

The second injection hole H6 may be disposed at a position rotated by a second set angle θ6 in a counterclockwise direction from the position of the first injection hole H5. The second set angle θ6 may be set in a range of 50 ° to 80 °.

Compression of the compression chamber is continuously performed in the process of injection of the refrigerant through the second injection hole (H6). At this time, the compression of the refrigerant corresponds to "two stage compression".

The third injection hole H7 may be disposed at a position rotated by a third set angle θ7 in the counterclockwise direction from the position of the second injection hole H6. The third set angle θ7 may be set in a range of 60 ° to 80 °. The range of the third set angle θ3 may be understood as a value determined in consideration of the injection hole overlapping phenomenon. Compression of the compression chamber is continuously performed in the process of injecting the refrigerant through the third injection hole H7. At this time, the compression of the refrigerant corresponds to "three-stage compression".

The fourth injection hole H8 may be disposed at a position rotated by the fourth set angle θ8 in the counterclockwise direction from the position of the third injection hole H7. The fourth set angle θ8 may be set in a range of 60 ° to 80 °. Compression of the compression chamber is continuously performed in the process of injecting the refrigerant through the fourth injection hole (H8). At this time, the compression of the refrigerant corresponds to "four-stage compression".

The fifth injection hole H9 may be disposed at a position rotated by the fifth set angle θ9 in the counterclockwise direction from the position of the fourth injection hole H8. The fifth set angle θ9 may be set in a range of 55 ° to 75 °. Compression of the compression chamber is continuously performed in the process of injecting the refrigerant through the fourth injection hole (H8). At this time, the compression of the refrigerant corresponds to "five stage compression".

After the injection of the refrigerant through the fifth injection hole H9 is completed (after the fifth injection hole H9 is closed), the compression chamber may be further compressed while rotating in a counterclockwise direction. Corresponds to "six-stage compression". The six-stage compression may be discharged to the outside of the fixed scroll through the discharge port 253.

The location of the injection hole is as follows. When the line connecting the center of the rotation axis and the center of the suction unit is viewed as the reference line L1, the position of the first injection hole H5 may be disposed at a position of 61 ° to 101 ° in a clockwise direction from the reference line. The second injection hole H6 may be disposed at a position rotated 50 ° to 80 ° in the counterclockwise direction from the first injection hole H5. The third injection hole H7 may be disposed at a position rotated by 60 ° to 80 ° counterclockwise from the second injection hole H6. The fourth injection hole H8 may be disposed at a position rotated by 60 ° to 80 ° counterclockwise from the third injection hole H7. The fifth injection hole H9 may be disposed at a position rotated 55 ° to 75 ° counterclockwise from the fourth injection hole H8.

8 is a view showing the arrangement of the injection hole of the compressor according to the third embodiment of the present invention.

The compressor according to the third embodiment of the present invention includes three injection inlets (41, 61, 51), each injection inlet (41, 61, 51) has three injection holes (H11, H12, It is connected to H13, H21, H22, H23, H31, H32 and H33.

In other words, it is possible to increase the injection flow rate by allowing one injection inlet to branch into a plurality of injection holes to be connected to the plurality of injection holes.

In this case, the same refrigerant is supplied to the injection holes at different positions, and the injection holes connected to one injection inlet are disposed at positions close to each other. In this case, the backflow of the refrigerant may occur due to the overlap of the injection holes, so each branched passage 41a, 41b, 41c, 61a, 61b, 61c, 51a, 51b, 51c and the injection holes H11, H12, H13, It is preferable to provide opening / closing means 43a, 43b, 43c, 63a, 63b, 63c, 53a, 53b, 53c between H21, H22, H23, H31, H32, H33.

As the opening and closing means, a check valve for suppressing the backflow of the refrigerant may be applied.

Opening and closing valves for active opening and closing of the injection passage may be applied. At this time, the operation of the on-off valve is preferably made by the rotation angle of the rotation shaft.

In the illustrated embodiment, each injection inlet is branched into three and connected to three injection holes, but one injection inlet may be divided into two or four or more, and a plurality of injection inlets may be different from each other. May be branched to.

The compressor according to the third embodiment of the present invention has the effect of increasing the injection flow rate while reducing the number of the injection expansion unit and the supercooling device disposed in the air conditioner.

The present invention described above is capable of various substitutions, modifications, and changes without departing from the spirit of the present invention for those skilled in the art to which the present invention pertains. It is not limited by.

10: compressor 20: condenser
25: evaporator 30: first expansion device
35: second expansion device 40: fourth supercooling device
41: fourth injection inlet 42: fourth injection euro
45: fourth injection expansion unit 50: third cooling unit
51: third injection inlet 52: third injection euro
55: third injection expansion unit 60: second supercooling device
61: second injection inlet 62: second injection euro
65: second injection expansion portion 70: first supercooling device
71: first injection inlet 72: first injection euro
75: first injection expansion portion 80: fifth cooling device
81: fifth injection inlet 82: fifth injection euro
85: 5th injection expansion part
150: Oldhamling 200: compression unit
210: casing 216: refrigerant discharge pipe
218: refrigerant suction pipe 220: drive motor
222: stator 224: rotor
226c: main bearing part 226g: sub bearing part
226a: oil supply flow path 226f: eccentric portion
226: axis of rotation 227: balance weight
230: main frame 240: turning scroll
241: Swivel Lab 250: Fixed Scroll
251: fixed wrap 253: discharge port
254: fixed scroll plate part

Claims (13)

A motor for generating a driving force;
A rotating shaft rotating through the motor;
A main frame supporting an upper portion of the rotating shaft;
A fixed scroll coupled to the main frame and having a fixed wrap;
A pivoting scroll arranged to pivot about said fixed scroll, said pivoting scroll having a pivoting wrap defining a rotatable compression chamber with said first wrap;
A suction part for allowing refrigerant to be sucked into the compression chamber; And
And a plurality of inlets provided in the fixed scroll and configured to inject the refrigerant into the compression chamber after the suction of the refrigerant through the suction unit is completed.
The method of claim 1,
And the plurality of inlets are individually formed to inject refrigerant of different pressure into the compression chamber.
The method of claim 2,
And a check valve connected to the plurality of inlets to prevent a backflow of the refrigerant flowing therein.
The method of claim 2,
At least one inlet of the inlet is divided into two or more, the compressor connected to two or more injection holes formed in different positions of the compression chamber.
The method of claim 3, wherein
Compressor further comprises an on-off valve for individually controlling the opening and closing of the two or more injection holes.
The method of claim 1,
Four inlets are formed and connected to four injection holes, respectively.
The first injection hole is disposed at a position in which an extension line connecting the center of the fixed scroll and the center of the suction unit is rotated by 61 ° to 101 ° in a direction opposite to the rotation direction of the compression chamber.
The second injection hole is disposed at a position rotated by 75 ° to 115 ° in the rotation direction of the compression chamber from the position of the first injection hole,
The third injection hole is disposed at a position rotated by 60 ° to 90 ° in the rotation direction of the compression chamber at the position of the second injection hole,
And the fourth injection hole is disposed at a position rotated by 60 ° to 100 ° in the rotation direction of the compression chamber at the position of the third injection hole.
The method of claim 6,
And an on / off valve for individually controlling opening and closing of each injection hole.
The method of claim 1,
The inlet is formed of five are connected to each of the five injection holes,
The first injection hole is disposed at a position in which an extension line connecting the center of the fixed scroll and the center of the suction part is rotated by 61 ° to 101 ° in a direction opposite to the rotation direction of the compression chamber.
The second injection hole is disposed at a position rotated by 50 ° ~ 80 ° in the rotation direction of the compression chamber from the position of the first injection hole,
The third injection hole is disposed at a position rotated by 60 ° to 80 ° in the rotation direction of the compression chamber at the position of the second injection hole,
The fourth injection hole is disposed at a position rotated by 60 ° ~ 80 ° in the rotation direction of the compression chamber at the position of the third injection hole,
And the fifth injection hole is disposed at a position rotated 55 ° to 75 ° in the rotation direction of the compression chamber at the position of the fourth injection hole.
The method of claim 8,
And an on / off valve for individually controlling opening and closing of each injection hole.
The method of claim 1,
The inlet is
A first inlet, a second inlet through which a refrigerant having a pressure relatively smaller than that injected into the first inlet is injected, and a third by which a refrigerant with a pressure relatively smaller than a refrigerant injected into the second inlet is injected; An inlet part and a fourth inlet part into which a refrigerant having a pressure relatively smaller than that of the refrigerant injected into the third inlet part is injected;
The injection hole connected to the fourth inlet part is disposed at a position in which an extension line connecting the center of the fixed scroll and the suction part is rotated by 61 ° to 101 ° in a direction opposite to the rotation direction of the compression chamber.
The injection hole connected to the third inlet is disposed at a position rotated by 75 ° to 115 ° in the rotation direction of the compression chamber at the position of the injection hole connected to the fourth inlet.
The injection hole connected to the second inlet is disposed at a position rotated by 60 ° to 90 ° in the rotation direction of the compression chamber at the position of the injection hole connected to the third inlet.
And the injection hole connected to the first inlet is rotated by 60 ° to 100 ° in the rotation direction of the compression chamber at the position of the injection hole connected to the second inlet.
The method of claim 1,
The inlet is
A first inlet, a second inlet through which a refrigerant having a pressure relatively smaller than that injected into the first inlet is injected, and a third by which a refrigerant with a pressure relatively smaller than a refrigerant injected into the second inlet is injected; An inlet, a fourth inlet through which a refrigerant having a pressure relatively lower than the refrigerant injected into the third inlet is injected, and a fifth inlet through which a refrigerant with a pressure relatively smaller than the refrigerant injected into the fourth inlet is injected; Including,
The injection hole connected to the fifth inlet part is disposed at a position in which an extension line connecting the center of the fixed scroll and the suction part is rotated by 61 ° to 101 ° in a direction opposite to the rotation direction of the compression chamber.
The injection hole connected to the fourth inlet part is disposed at a position in which an extension line connecting the center of the fixed scroll and the suction part is rotated by 50 ° to 80 ° in a direction opposite to the rotation direction of the compression chamber.
The injection hole connected to the third inlet is disposed at a position rotated by 60 ° to 80 ° in the rotation direction of the compression chamber at the position of the injection hole connected to the fourth inlet.
The injection hole connected to the second inlet is disposed at a position rotated by 60 ° to 80 ° in the rotation direction of the compression chamber at the position of the injection hole connected to the third inlet.
And the injection hole connected to the first inlet is rotated by 55 ° to 75 ° in the rotation direction of the compression chamber at the position of the injection hole connected to the second inlet.
The method of claim 10 or 11,
At least one inlet of the inlet is divided into two or more, the compressor connected to the two or more injection holes.
The method of claim 12,
And an on / off valve for individually controlling opening and closing of each injection hole.

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