KR102403949B1 - Scroll compressor - Google Patents

Abstract

A scroll compressor according to the present invention includes: a casing having a suction pipe and a discharge pipe; a driving unit having a stator and a rotor, and a rotating shaft connected to the rotor; a first scroll positioned to be fixed inside the casing; a second scroll connected to the rotation shaft and rotating while being engaged with the first scroll, the second scroll forming first and second compression chambers in which the suction refrigerant introduced into the suction port is respectively sucked at positions spaced apart from each other with the rotation shaft interposed therebetween; and first and second injection passages formed through the first scroll to respectively inject injection refrigerant having a higher pressure than that of the suction refrigerant into the first and second compression chambers. Accordingly, it is possible to inject a refrigerant of a constant intermediate pressure into the symmetrical scroll compressor, so that the state of the refrigerant discharged can be accurately changed.

Description

Scroll Compressor {SCROLL COMPRESSOR}

The present invention relates to a scroll compressor configured to change the capacity of the compressor by bypassing a refrigerant circulating in a refrigeration cycle to an intermediate compression chamber.

In general, a hermetic compressor is provided with a driving motor for generating a driving force in the inner space of a sealed casing, and a compression unit for compressing a fluid by receiving the driving force of the driving motor.

In a scroll compressor, which is a type of hermetic compressor, a non-orbiting scroll is installed in the inner space of a casing, and the orbiting scroll engages with the non-orbiting scroll to perform a orbiting motion, and suction is performed between the non-orbiting wrap of the non-orbiting scroll and the orbiting wrap of the orbiting scroll. It is a compressor that forms two pairs of compression chambers consisting of a chamber, an intermediate pressure chamber, and a discharge chamber.

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

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

Meanwhile, the scroll compressor may be divided into a fixed capacity type and a variable capacity type according to a refrigerant circulation method. The fixed capacity type is a method in which the entire refrigerant discharged from the compressor circulates through a refrigeration cycle composed of a condenser, an expander, and an evaporator, and is sucked into the suction side of the compressor. In contrast, the variable capacity type is a method in which a portion of the refrigerant discharged from the compressor is bypassed in the middle of the refrigeration cycle, flows back into the intermediate compression chamber of the compressor, and the remainder is sucked into the suction side of the compressor through the refrigeration cycle in turn.

Variable displacement scroll compressor branches an injection tube at the outlet of the condenser, communicates the injection tube with the intermediate compression chamber of the compressor, and controls the circulation path of the refrigerant in the middle of the injection tube or at a point where the injection tube is branched. The valve is installed. Representatively, in the prior art such as Patent Document 1, one injection passage for injecting the refrigerant into the intermediate compression chamber is formed in the fixed scroll.

Meanwhile, FIGS. 1A and 1B are plan conceptual views respectively illustrating an asymmetric scroll arrangement and a symmetric scroll arrangement in a scroll compressor. In the asymmetric scroll arrangement shown in FIG. 1A , the refrigerant is alternately introduced into the two compression chambers through the same suction chamber point and compressed. At this time, as shown in FIG. 1A , the refrigerant may be injected into each intermediate compression chamber point by one injection port.

However, in the symmetrical scroll arrangement shown in FIG. 1B , the refrigerant flows into the two compression chambers at two different suction chamber points, respectively, and is compressed. In this case, an injection passage through which the refrigerant can be injected into each compression chamber is required, and in particular, it is preferable that the refrigerant is injected into the intermediate compression chamber at the same pressure in each compression chamber.

Therefore, in the variable displacement scroll compressor having a symmetrical scroll arrangement, it is necessary to specify an injection passage for uniformly injecting the refrigerant into the two intermediate compression chambers.

And at this time, it is preferable to provide a method for reducing manufacturing cost and power loss by simplifying the configuration of the injection passage for injecting the refrigerant into the two compression chambers, and also to increase the compression efficiency of the refrigerant.

Patent Publication No. KR10-2010-0096791 A (published on Sept. 2, 2010)

SUMMARY OF THE INVENTION It is a first object of the present invention to provide a scroll compressor having injection flow paths configured to respectively inject refrigerant into two compression chambers formed by a symmetrical scroll arrangement.

A second object of the present invention is to provide a scroll compressor in which injection passages for supplying refrigerant to each compression chamber are connected to each other to have a simple piping configuration.

A third object of the present invention is to provide a scroll compressor in which an injection flow path is formed to heat a refrigerant injected through heat exchange in an enclosed space.

In order to achieve the first object of the present invention, a scroll compressor according to the present invention includes: a casing having a suction pipe and a discharge pipe; a driving unit having a stator and a rotor, and a rotating shaft connected to the rotor; a first scroll positioned to be fixed inside the casing; a second scroll connected to the rotation shaft and rotating while being engaged with the first scroll, the second scroll forming first and second compression chambers in which the suction refrigerant introduced into the suction pipe is respectively sucked at positions spaced apart from each other with the rotation shaft interposed therebetween; and first and second injection passages formed through the first scroll to respectively inject injection refrigerant having a higher pressure than that of the suction refrigerant into the first and second compression chambers.

The first injection flow path includes a first injection port communicating with the first compression chamber, and the second injection flow path is located on the opposite side of the first injection port with respect to the rotational center of the rotation shaft, the second compression chamber and A second injection port that communicates with each other may be provided, so that refrigerant may be injected into both compression chambers at the same intermediate pressure point.

In addition, the first and second injection ports may be positioned to open and close at the same time according to the rotation of the second scroll, so that refrigerant may be injected into both compression chambers at the same time.

Each of the first and second injection passages includes an inner passage portion formed to pass through the first scroll; and an external flow passage having one end communicating with the inner flow passage through the casing, and the other end communicating with a condenser in which the injection refrigerant is accommodated.

The inner flow passage may include: a radial flow passage passing through the first scroll in a radial direction of the rotation shaft; and an axial flow passage formed to pass through the first scroll in the axial direction of the rotation shaft, one end communicating with the radial flow passage and the other end communicating with the first or second compression chamber.

In order to achieve the second object of the present invention, a scroll compressor according to the present invention includes: a casing having a suction pipe and a discharge pipe; a driving unit having a stator and a rotor, and a rotating shaft connected to the rotor; a first scroll positioned to be fixed inside the casing; a second scroll connected to the rotation shaft and rotating while being engaged with the first scroll, the second scroll forming first and second compression chambers in which the suction refrigerant introduced into the suction pipe is respectively sucked at positions spaced apart from each other with the rotation shaft interposed therebetween; and first and second injection passages formed to pass through the first scroll, wherein the first injection passage includes: a first internal passage portion formed to pass through the first scroll and communicate with the first compression chamber; and an external flow path having one end communicating with the first internal flow path through the casing, and the other end communicating with a condenser in which the injection refrigerant is accommodated, wherein the second injection flow path has one end of the first It communicates with the first internal flow path part and the other end includes a second internal flow path part formed to communicate with the second compression chamber.

At least a portion of the second internal flow path part may be formed to pass through the first scroll in parallel with the first internal flow path part.

The second internal flow passage may include: a first through passage formed through the first scroll and communicating with the first internal passage; a second through passage formed through the first scroll to communicate with the second compression chamber; and a tube passage formed outside the first scroll to communicate the first and second through passages with each other.

In order to achieve the third object of the present invention, the casing includes a separation plate dividing the inner space into a high-pressure part and a low-pressure part, and the tube flow path is located in the high-pressure part, so that heat exchange can be made between the high-pressure part and the tube flow path.

According to the present invention constituted by the solution described above, the following effects are obtained.

First, the scroll compressor of the present invention includes first and second injection passages through which injection refrigerant is sucked into first and second compression chambers formed by a symmetrical scroll, respectively, so that the discharge pressure of the symmetrically arranged scroll compressor is variable. This can be reliably implemented.

In particular, since the first and second injection ports are disposed at an angle of approximately 180 degrees with respect to the center of rotation, the injection refrigerant may be injected into the same intermediate pressure point of the first and second compression chambers, respectively. Accordingly, a pressure difference between refrigerants discharged from both compression chambers may be minimized, and operational reliability and stability of the scroll compressor may be improved.

Second, in the scroll compressor of the present invention, the second injection passage is configured to receive the injection refrigerant from the first injection passage inside the casing, so that a cycle piping configuration for supplying the injection refrigerant to the two compression chambers can be simply implemented. .

In this case, since the second injection flow path is formed to pass through the fixed scroll in parallel with the first injection flow path, at least a part of the second injection flow path may be simplified in the configuration of the injection refrigerant flow path inside the casing.

Alternatively, the second injection flow path includes first and second through passages penetrating the first scroll, respectively, and a tube flow path connecting the first and second through passages, so that processing through the first scroll can be easily performed. In addition, it is possible to minimize the decrease in strength of the first scroll.

Third, since the tube flow path is disposed in a space through which the high-temperature discharged refrigerant flows, the injection refrigerant may be preheated before being sucked into the first and second compression chambers. Accordingly, the discharge pressure of the refrigerant may be further increased, and the compression efficiency may be improved.

1A is a conceptual diagram illustrating a planar arrangement of an asymmetric scroll in a scroll compressor.
1B is a conceptual diagram illustrating a planar arrangement of a symmetric scroll in a scroll compressor;
2 is a longitudinal cross-sectional view showing a scroll compressor according to an embodiment of the present invention;
3 is a conceptual diagram illustrating a plane positional relationship between the fixed scroll and the orbiting scroll shown in FIG. 2 .
4 is a schematic diagram illustrating a refrigeration cycle equipped with the scroll compressor shown in FIG. 2;
Fig. 5 is a bottom view of the fixed scroll taken along line AA' shown in Fig. 2;
6A is a longitudinal cross-sectional view showing a part of a scroll compressor according to another embodiment of the present invention;
Fig. 6b is a bottom view of the fixed scroll taken along line BB' shown in Fig. 6a;
7A is a longitudinal cross-sectional view showing a part of a scroll compressor according to another embodiment of the present invention;
Fig. 7B is a bottom view of the fixed scroll taken along line CC' shown in Fig. 7A;

Hereinafter, a scroll compressor according to the present invention will be described in more detail with reference to the drawings.

Even in different embodiments, the same or similar reference numerals are assigned to the same or similar components as in the previous embodiment, and overlapping descriptions thereof will be omitted.

In describing the embodiments disclosed in the present specification, if it is determined that a detailed description of a related known technology may obscure the gist of the embodiment disclosed in the present specification, the detailed description thereof will be omitted.

The accompanying drawings are only for easy understanding of the embodiments disclosed in the present specification, and the technical spirit disclosed herein is not limited by the accompanying drawings, and all changes and equivalents included in the spirit and scope of the present invention It should be understood to include water or substitutes.

The singular expression includes the plural expression unless the context clearly dictates otherwise.

2 is a longitudinal cross-sectional view showing the scroll compressor 100 according to an embodiment of the present invention. The scroll compressor according to the present invention may be implemented as both a high-pressure type and a low-pressure type, but in this embodiment, the low-pressure type scroll compressor shown in FIG. 2 will be described as an example.

According to FIG. 2 , the scroll compressor 100 of the present invention includes a casing 110 that forms a sealed internal space. The inner space of the casing 110 may be separated into a low-pressure part 112 which is a suction space and a high-pressure part 113 which is a discharge space by a separator 111 installed on the upper side of the fixed scroll 150 to be described later. . Here, the low-pressure part 112 may correspond to the space below the separator 111 , and the high-pressure part 113 may correspond to the space above the separator 111 .

In addition, the suction pipe 114 communicating with the low-pressure part 112 and the discharge pipe 115 communicating with the high-pressure part 113 are fixed to the casing 110 , respectively, so that the refrigerant is sucked into the inner space of the casing 110 or the casing (110) to be discharged to the outside.

A driving unit 120 including a stator 121 , a rotor 122 and a rotating shaft 125 is provided in the low pressure part 112 of the casing 110 . The stator 121 may be fixed to the inner wall surface of the casing 110 in a shrink fit method, and the rotating shaft 125 may be inserted and coupled to the central portion of the rotor 122 .

An upper portion of the rotation shaft 125 is rotatably supported by the main frame 130 . The main frame 130 is fixedly installed on the inner wall surface of the casing 110 , the main bearing part 131 protruding downward is formed on the bottom surface, and the rotating shaft 125 is inserted into the main bearing part 131 . . The inner wall surface of the main bearing part 131 acts as a bearing surface and supports the rotation shaft 125 to rotate smoothly together with oil.

A lower portion of the rotating shaft 125 is rotatably supported by an auxiliary bearing 117 installed at a lower portion of the casing 110 . The auxiliary bearing 117 is supported by the lower frame 118 fixed to the inner surface of the casing 110 to stably support the rotating shaft 125 . The lower frame 118 may be welded to the inner wall surface of the casing 110 , and the bottom surface of the casing 110 may be used as an oil storage space. The oil stored in the oil storage space is transferred upward by the rotating shaft 125 or the like, so that the oil can be evenly supplied into the casing 110 .

In the scroll compressor 100 of the present invention, the refrigerant is compressed while the second scroll is rotated with respect to the first scroll. Hereinafter, the first scroll means the fixed scroll 150 positioned to be fixed to the casing 110 , and the second scroll means the orbiting scroll 140 that is rotated by being engaged with the fixed scroll 150 by the rotation shaft 125 . do.

The orbiting scroll 140 is disposed on the upper surface of the main frame 130 . The orbiting scroll 140 includes a head plate part 141 having a substantially disk shape and a turning wrap 142 spirally formed on one side of the head plate part 141 . The orbiting wrap 142 forms a compression chamber together with the fixed wrap 152 of the fixed scroll 150 to be described later.

The end plate 141 of the orbiting scroll 140 is driven to turn while being supported by the upper surface of the main frame 130 . In this case, the Oldham ring 136 is installed between the head plate 141 and the main frame 130 to prevent the orbiting scroll 140 from rotating.

In addition, a boss 143 into which the rotating shaft 125 is inserted is formed on the bottom surface of the head plate 141 of the orbiting scroll 140 , and through this, the rotational force of the rotating shaft 125 drives the orbiting scroll 140 to orbit. .

The fixed scroll 150 engaged with the orbiting scroll 140 is disposed above the orbiting scroll 140 . Here, the fixed scroll 150 is installed to be movable in the vertical direction with respect to the orbiting scroll 140 . Specifically, a plurality of guide pins (not shown) fitted to the main frame 130 are provided to the fixed scroll 150 . It rests on the upper surface of the main frame 130 in a state of being inserted into a plurality of guide holes (not shown) formed on the outer periphery.

On the other hand, the fixed scroll 150 may include a disk-shaped end plate portion 151 and a spiral fixed wrap 152 engaged with the orbiting wrap 142 of the orbiting scroll 140 at the lower portion of the end plate portion 151 . can

A suction port 153 through which the refrigerant present in the low pressure unit 112 is sucked is formed on a side surface of the fixed scroll 150 , and a discharge port 154 through which the compressed refrigerant is discharged is formed at an approximately central portion of the end plate unit 151 . do.

Meanwhile, FIG. 3 is a conceptual diagram illustrating a plane positional relationship between the fixed scroll 150 and the orbiting scroll 140 shown in FIG. 2 . According to FIG. 3 , the scroll compressor 100 according to the present invention has a symmetrical scroll arrangement. Specifically, the orbiting wrap 142 and the fixed wrap 152 form first and second compression chambers P1 and P2 in which the refrigerant is divided and sucked from opposite sides based on the rotation center of the rotation shaft 125 . The volume of the first and second compression chambers P1 and P2 is reduced while pivoting toward the discharge port 154, respectively, to compress the refrigerant. Accordingly, the pressure is the minimum at the periphery adjacent to the suction port 153, the pressure is maximum at the center communicating with the discharge port 154, and the pressure in the helical space therebetween is the suction pressure of the suction port 153 and the discharge port ( 154) to achieve an intermediate pressure with a value between the discharge pressures.

The scroll compressor 100 according to the present embodiment as described above operates as follows.

First, when electric power is applied to the stator 121 side, the rotor 122 and the rotating shaft 125 are rotated thereby. Then, the orbiting scroll 140 coupled to the upper portion of the rotating shaft 125 rotates with respect to the fixed scroll 150 as the rotating shaft 125 rotates, and as a result, the fixed wrap 152 and the orbiting wrap 142 ), respectively, a plurality of first and second compression chambers (P1, P2) formed between are continuously moved toward the discharge port (154).

The process of moving while the volume of the first and second compression chambers P1 and P2 is changed may be performed, for example, in the order of (a) to (d) shown in FIG. 3 . 3 (a) to (d), the center of the fixed wrap 152 can be seen as a reference point (152a) positioned to coincide with the center of the rotation shaft (125). In addition, the orbital wrap 142 may have an eccentric point 142a spaced apart from the reference point 152a. As shown in FIG. 3 , the rotation of the orbiting wrap 142 may appear as the eccentric point 142a rotates clockwise while maintaining a predetermined distance around the reference point 152a.

At this time, the suction refrigerant may be introduced into the low pressure part 112 of the casing 110 through the suction pipe 114 . And the refrigerant introduced into the low-pressure unit 112 is introduced into the first and second compression chambers P1 and P2 through the suction port 153, respectively, and is compressed while moving inside each compression chamber. The compressed refrigerant flows out from the center of the first and second compression chambers P1 and P2 to the discharge port 154, stays in the high-pressure unit 113, and is discharged to the outside of the casing 110 through the discharge pipe 115. can

Meanwhile, FIG. 4 is a schematic diagram showing the refrigeration cycle 10 provided with the scroll compressor 100 shown in FIG. 2 . When the scroll compressor 100 of the present invention is configured in a variable capacity type, the scroll compressor 100 is located in the middle of the refrigeration cycle 10 including the scroll compressor 100 of the present invention, that is, at the outlet side of the condenser 11 . ) may be reintroduced into the first and second compression chambers P1 and P2 having an intermediate pressure to increase the amount of compressed refrigerant.

For example, referring to FIG. 4 , the injection pipe 14 is located in the middle of the refrigerant pipe 13 connecting the condenser 11 and the expander 12 of the refrigeration cycle 10 , that is, at the outlet side of the condenser 11 . ) is branched, and the injection pipe 14 is connected to the scroll compressor 100 . A bypass valve 15 for controlling the flow of the refrigerant may be installed in the middle of the injection pipe 14 or at a point where the injection pipe 14 is branched.

With this configuration, when the capacity of the scroll compressor 100 of the present invention is insufficient, the injection refrigerant that has passed through the condenser 11 of the refrigeration cycle 10 can be injected into the compression chamber. At this time, the injection refrigerant passing through the condenser 11 has a higher pressure than the suction refrigerant flowing into the suction pipe 114 . By introducing the injection refrigerant during the expansion or condensation process of the refrigeration cycle into the compression chamber in the middle of the compression process, the overall capacity of the scroll compressor 100 according to the present invention can be improved.

The scroll compressor 100 of the present invention provided in the configuration of the refrigeration cycle 10 as described above has a configuration capable of injecting injection refrigerant into each of the first and second compression chambers P1 and P2, respectively. Hereinafter, with reference to FIGS. 2 and 3 and FIG. 5 , which is a bottom view of the fixed scroll 150 taken along the line AA′ shown in FIG. 2 , injection of the scroll compressor 100 according to an embodiment of the present invention Structural features and functions related to the flow path will be described.

2, 3 and 5 , the scroll compressor 100 according to the present embodiment includes first and second injection passages 160 and 170 . The first injection passage 160 communicates with the first compression chamber P1, and the second injection passage 170 communicates with the second compression chamber P2. Accordingly, the first and second injection passages 160 and 170 inject the injection refrigerant into the first and second compression chambers P1 and P2, respectively, and, in particular, are fixed positioned to be fixed with the casing 110 . It is formed through the scroll 150 .

Specifically, the fixed scroll 150 may be formed to pass through the end plate 151 . In addition, the first and second injection passages 160 and 170 are positioned to communicate with the inside of the first and second compression chambers P1 and P2 that are moved while changing their volume, respectively, and at points where the refrigerant has an intermediate pressure. can be

As described above, the first and second compression chambers P1 and P2 formed by the fixed scroll 150 and the orbiting scroll 140 are spirally rotated in a space separated from each other from the outside close to the suction port 153 . volume is reduced. In addition, the first and second compression chambers P1 and P2 may communicate with each other at a point moved to the center close to the discharge port 154 .

When the suction refrigerant is compressed in the first and second compression chambers (P1, P2) separated from each other, when the injection refrigerant is additionally injected into only one of the compression chambers, as a result, the discharge port 154 in each compression chamber A deviation occurs in the pressure of the refrigerant discharged to the In this case, since it is difficult for the final pressure of the discharged refrigerant to have a constant value, stable operation may be difficult.

As in the scroll compressor 100 of the present invention, when the first and second injection passages 160 and 170 are formed in each of the first and second compression chambers P1 and P2 having a symmetrical shape, the pressure deviation of the discharged refrigerant is reduced. It becomes possible to operate the compressor in which the reduced and variable capacity is stably secured.

In addition, in order to further reduce the discharge pressure deviation between the refrigerant compressed by the first and second compression chambers P1 and P2 , the first injection flow path 160 supplies the injection refrigerant to the first compression chamber P1 . The intermediate pressure of , and the intermediate pressure of the position where the second injection passage 170 supplies the injection refrigerant to the second compression chamber P2 need to be formed to be the same.

To this end, the first and second injection passages 160 and 170 may be configured to communicate with the first and second compression chambers P1 and P2 at points rotated by the same crank angle from the suction pressure point, respectively. Specifically, when the first injection passage 160 includes the first injection port 161 communicating with the first compression chamber P1, the second injection passage 170 is the rotation center (reference point) of the rotation shaft 125 . , 152a) may be provided with a second injection port 171 positioned on the opposite side of the first injection port 161 to communicate with the second compression chamber (P2).

In this case, as shown in FIG. 3 , the first and second injection ports 161 and 171 and the reference point 152a may be positioned to be connected in a straight line. In addition, the first and second injection ports 161 and 171 may be points rotated at the same angle from each of the suction pressure points on the inlet side of the first and second compression chambers P1 and P2, and as shown in FIG. The angle may be 180°.

Meanwhile, distances from the reference point 152a to the first and second injection ports 161 and 171 in the radial direction of the fixed wrap 152 and the orbiting wrap 142 may be different from each other. However, the first and second injection ports 161 and 171 may be respectively located at a distance that can be opened and closed at the same time by the rotation of the orbital wrap 142 . Referring to FIG. 3 , as shown in FIG. 3C , the first and second turning wraps 142 close the inlets of the first and second compression chambers P1 and P2 to start compression at a point where they are positioned. The injection ports 161 and 171 are closed at the same time, and the turning wrap 142 at the positions of (a), (b) and (d) of FIG. 3 opens the first and second injection ports 161 and 171 can be done

As such, the first and second injection ports 161 and 171 are arranged in a line together with the reference point 152a and open and close at the same time, so that the injection refrigerant is at the same intermediate pressure point of the first and second compression chambers P1 and P2. can be injected into each. Accordingly, the pressure difference between the refrigerants discharged from both compression chambers may be minimized, and the operation reliability and stability of the scroll compressor 100 may be improved.

Meanwhile, in the present embodiment, the first and second injection passages 160 and 170 may be independently formed inside the scroll compressor 100 of the present invention. Referring to FIGS. 2 and 5 , taking the first injection flow path 160 as an example, the first injection flow path 160 may include an internal flow path part 162 formed through the inside of the fixed scroll 150 first. can

In consideration of processing convenience, the inner flow passage 162 may include a radial flow passage 162a formed in the radial direction of the rotation shaft 125 and an axial flow passage 162b formed in the axial direction of the rotation shaft 125 . can The axial flow path 162b formed in the axial direction of the rotation shaft 125 may be formed so that one end communicates with the radial flow path 162a and the other end communicates with the first compression chamber P1, thereby 1 The location of the injection port 161 may be determined.

In addition, the first injection flow path 160 has one end passing through the casing 110 to communicate with the internal flow path part 162 and the other end of the first injection flow path part 163 communicating with the condenser 11 in which the injection refrigerant is accommodated. ) may be included.

Just as the first injection flow path 160 includes the internal flow path part 162 and the external flow path part 163 , the second injection flow path 170 also includes the internal flow path part 172 and the external flow path part 173 . can do. At this time, the external flow path part 163 of the first injection flow path 160 and the external flow path part 173 of the second injection flow path 170 may be respectively connected to the condenser 11, but in consideration of the simplification of the piping structure, They may be joined to each other at a point and connected to the condenser 11 .

As shown in FIG. 4 , the external flow passages 163 and 173 of the first and second injection passages 160 and 170 are joined to each other, and the injection refrigerant is simultaneously controlled by a control means such as one bypass valve 15 . may be regulated. However, separate flow control means are provided in the external flow passages 163 and 173 of the first and second injection passages 160 and 170, respectively, so that the injection of the injection refrigerant may be controlled as needed.

Meanwhile, FIG. 6A is a longitudinal cross-sectional view showing a part of the scroll compressor 200 according to another embodiment of the present invention, and FIG. 6B is a bottom view of the fixed scroll 250 taken along the line BB' shown in FIG. 6A. Hereinafter, the structure and effect of branching the injection flow path in the scroll compressor 100 of the present invention to minimize the complexity of the pipe structure of the injection pipe 14 will be described.

In this embodiment, the first injection flow path 260 may include the first internal flow path part 262 and the external flow path part 263 , and the second injection flow path may include the second internal flow path part 272 . have.

That is, the first injection flow path 260 for injecting the injection refrigerant into the first compression chamber P1 passes through the fixed scroll 250 and communicates with the first compression chamber P1 through the first internal flow path part 262 . may include As in the previous embodiment, the first inner flow passage 262 may be formed of a combination of the radial flow passage 262a and the axial flow passage 262b, and may form the first injection port 261 . In addition, the first injection flow path 260 includes an external flow path part 263 at one end passing through the casing 110 to communicate with the first internal flow path part 262 and the other end communicating with the condenser 11 . can do.

Unlike the first injection flow path 260 , the second injection flow path has one end communicating with the first internal flow path part 262 and the other end communicating with the second compression chamber P2 to connect the second injection port 271 . It may include a second internal flow path portion 272 to form. That is, the second injection flow path does not have a flow path mounted on the outside of the casing 110 so as to be separately connected to the condenser 11 , but shares the external flow path part 263 of the first injection flow path 260 to supply the injection refrigerant. can receive

In this way, when the injection refrigerant is introduced from the outside of the casing 110 by the one external flow path part 263, the refrigerant piping configuration for supplying the injection refrigerant to the first and second compression chambers P1 and P2, respectively This can be simplified. In addition, since the penetration structure of the casing 110 forming the sealed space may be reduced, the stability of the sealed structure of the scroll compressor 200 of the present invention in which the refrigerant is compressed to a high pressure may be improved.

Meanwhile, as shown in FIGS. 6A and 6B , at least a portion of the second internal flow path part 272 may be formed in parallel with the first internal flow path part 262 . That is, a part of the first internal flow path part and a part of the second internal flow path part 272 may be formed to pass through the fixed scroll 250 in a straight line in a radial direction of the rotation shaft 125 . At this time, as shown in FIG. 6B , the second internal flow path part 272 may be formed to pass through to avoid a space through which the rotation shaft 125 passes.

As described above, since the first and second internal flow passages 262 and 272 are formed to pass through the fixed scroll 150 , the configuration of the injection passage of the scroll compressor 100 according to the present invention can be simply implemented. Furthermore, since the first and second internal flow passages 262 and 272 can be simultaneously machined, machining of the fixed scroll 150, which is important for maintaining structural strength, can be minimized.

7A is a longitudinal cross-sectional view of a portion of the scroll compressor 300 according to another embodiment of the present invention, and FIG. 7B is a bottom view of the fixed scroll 350 taken along the line CC' shown in FIG. 7A. With reference to FIGS. 7A and 7B , another embodiment of the present invention that can accurately form the first and second injection ports 361 and 371 at symmetrical positions and can contribute to improvement of compression efficiency will be described.

The first injection flow path 360 may include a first internal flow path part 362 and an external flow path part 363 similarly to the other exemplary embodiments. In addition, the second injection flow path may include a second internal flow path part 372 communicating with the first internal flow path part 362 . However, the second internal flow path part 372 according to the present embodiment may include first and second through flow paths 372a and 372b and a tube flow path 372c.

The first and second through passages 372a and 372b are formed to pass through the fixed scroll 350 . In particular, as shown in FIG. 7A , the first and second injection ports 361 and 371 may be formed to pass through the fixed scroll 350 in the axial direction of the rotation shaft 125 , respectively. In this case, the first through passage 372a may be positioned to communicate with the first internal passage portion 362 , and the second through passage 372b may communicate with the second compression chamber P2 .

The tube flow path is formed outside the fixed scroll 150 to communicate the first and second through flow paths 372a and 372b with each other. As shown in FIG. 7A , when each end of the first and second through passages 372b is positioned on the upper surface of the fixed scroll 150, the tube passage 372c forms the first and second through passages 372a, 372b) may be formed to connect to each other. The tube flow path 372c may be formed of a separate pipe structure.

By the structure of the second internal flow path part 372 of this embodiment, as shown in FIG. 7B , the first and second injection ports 361 and 371 are easily arranged on opposite sides with respect to the rotation shaft 125 . do. Therefore, there is an advantage in that it is easy to supply the injection refrigerant to the same intermediate pressure point of the first and second compression chambers P1 and P2. In addition, since the structure penetrating the fixed scroll 350 in the radial direction of the rotation shaft 125 is reduced, there is an effect that the risk of a decrease in strength of the fixed scroll 350 is reduced.

Meanwhile, as shown in FIG. 7A , the tube flow path 372c may be located in the space of the high-pressure part 113 of the scroll compressor 300 of the present invention. Since the refrigerant of the high-pressure part 113 is in a high-temperature state where compression is completed, when the tube flow path 372c passes through the high-pressure part 113 , the injection refrigerant may be heated by heat exchange with the high-pressure part 113 .

By heat-exchanging the injection refrigerant with the discharged refrigerant at high temperature, it may be heated in advance before being sucked into the second compression chamber P2. Accordingly, the discharge pressure of the refrigerant compressed in the compression chamber may be further increased, and thus the compression efficiency of the scroll compressor 300 of the present invention may be improved.

What has been described above is merely exemplary embodiments for implementing the scroll compressor according to the present invention, and the present invention is not limited to the above embodiments, and as claimed in the following claims, the scope of the present invention does not deviate from the scope of the present invention. It will be said that the technical idea of the present invention exists to the extent that various modifications can be made by anyone with ordinary knowledge in the field to which the invention pertains within.

10: refrigeration cycle 11: condenser
12: expander 13: refrigerant pipe
14: injection pipe 15: bypass valve
100, 200, 300: scroll compressor 110: casing
111: separator 112: low pressure part
113: high pressure part 114: suction pipe
115: discharge pipe 117: auxiliary bearing
118: lower frame 120: drive unit
121: stator 122: rotor
125: axis of rotation 130: main frame
131: main bearing part 136: Oldham ring
140: orbiting scroll (second scroll) 141: end plate portion
142: turning wrap 142a: eccentric point
143: boss 150: fixed scroll (first scroll)
151: end plate 152: fixed wrap
152a: reference point 153: inlet
154: outlet 160, 260, 360: first injection flow path
161, 261, 361: first injection port 162, 172: internal flow passage
162a, 262a: radial flow passages 162b, 262b: axial flow passages
163, 173, 263, 363: external flow path 170: second injection flow path
171, 271, 371: second injection port 262, 362: first internal flow path part
272, 372: second internal flow passage 372a: first through passage
372b: second through passage 372c: tube passage

Claims (9)

a casing having a suction pipe and a discharge pipe;
a driving unit having a stator and a rotor and a rotating shaft connected to the rotor;
a first scroll positioned to be fixed inside the casing;
a second scroll connected to the rotation shaft and rotating while being engaged with the first scroll, the second scroll forming first and second compression chambers in which the suction refrigerant introduced into the suction pipe is respectively sucked at positions spaced apart from each other with the rotation shaft interposed therebetween; and
and first and second injection passages formed through the first scroll to respectively inject injection refrigerant at a higher pressure than the suction refrigerant into the first and second compression chambers,
The first injection flow path,
a first internal flow passage formed to pass through the first scroll and communicate with the first compression chamber; and
One end passes through the casing and communicates with the first internal flow path part, and the other end includes an external flow path part configured to communicate with the condenser in which the injection refrigerant is accommodated,
The second injection flow path includes a second internal flow path formed such that one end communicates with the first internal flow path and the other end communicates with the second compression chamber,
The second internal flow path portion,
a first through passage formed through the first scroll and communicating with the first internal passage portion;
a second through passage formed through the first scroll to communicate with the second compression chamber; and
and a tube passage formed outside the first scroll to communicate the first and second through passages with each other. According to claim 1,
The first injection passage includes a first injection port communicating with the first compression chamber,
and a second injection port positioned opposite to the first injection port with respect to the rotation center of the rotation shaft and communicating with the second compression chamber. 3. The method of claim 2,
The scroll compressor according to claim 1, wherein the first and second injection ports are positioned such that they can be simultaneously opened and closed according to rotation of the second scroll. delete delete delete According to claim 1,
The scroll compressor of claim 1, wherein at least a portion of the second internal flow path part passes through the first scroll in parallel with the first internal flow path part. delete According to claim 1,
The casing includes a separating plate that divides the inner space into a high-pressure part and a low-pressure part,
The tube flow path is a scroll compressor, characterized in that located in the high-pressure part.

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