WO2019234823A1

WO2019234823A1 - Scroll compressor

Info

Publication number: WO2019234823A1
Application number: PCT/JP2018/021536
Authority: WO
Inventors: 哲仁 ▲高▼井; 友寿松井; 祐司 ▲高▼村
Original assignee: 三菱電機株式会社
Priority date: 2018-06-05
Filing date: 2018-06-05
Publication date: 2019-12-12
Also published as: JP6921321B2; JPWO2019234823A1

Abstract

This scroll compressor has a compression section provided with: a stationary scroll having a stationary spiral body raised from a stationary base plate; and an orbiting scroll having an orbiting spiral body raised from an orbiting base plate, and fluid is compressed in a compression chamber within a spiral structure formed by combining the stationary spiral body and the orbiting spiral body. In the scroll compressor, a suction pressure space into which fluid is sucked from the outside is formed outside the spiral structure, and the scroll compressor has an injection port for injecting injection fluid into the suction pressure space, the injection port being formed in the stationary base plate outside the spiral structure.

Description

Scroll compressor

The present invention relates to a scroll compressor used for an air conditioner, a refrigerator, and the like.

The scroll compressor has a configuration including a compression unit that compresses the refrigerant in a compression chamber formed by combining a fixed scroll and an orbiting scroll, and a container that houses the compression unit. Each of the fixed scroll and the swing scroll has a configuration in which a spiral body is formed on a base plate, and a compression chamber is formed in a spiral structure configured by meshing the spiral bodies.

In this type of scroll compressor, the inside of the spiral structure becomes hot under a high compression ratio condition in which the discharge temperature tends to be high. For this reason, each of the fixed scroll and the orbiting scroll is thermally expanded, and the gap between the spiral end of each of the fixed scroll and the orbiting scroll and the opposite scroll base plate is reduced. There is a problem that the compressor is damaged due to contact.

Conventionally, in order to solve this problem, the temperature of the spiral structure is reduced by flowing a liquid refrigerant or a two-phase refrigerant having a lower temperature and a lower pressure than the refrigerant being compressed in the compression chamber into the compression chamber of the intermediate pressure. There is a scroll compressor (see, for example, Patent Document 1).

International Publication No. 2016/019921

In the configuration of Patent Document 1, refrigerant is injected into an intermediate pressure portion in the compression chamber. For this reason, the refrigerant | coolant from which pressure differs mixes in a compression chamber, the mixing loss arises, and the subject that the performance of a compressor fell occurred.

The present invention has been made in view of these points, and an object of the present invention is to provide a scroll compressor capable of improving performance by eliminating mixing loss in the compression chamber.

A scroll compressor according to the present invention has a compression section that includes a fixed scroll having a fixed spiral body standing on a fixed base plate, and a swing scroll having a swing spiral body standing on a swing base plate. In a scroll compressor that compresses fluid in a compression chamber in a spiral structure formed by combining a fixed spiral body and an oscillating spiral body, the outside of the spiral structure body is sucked in from outside. A pressure space is formed, and the fixed base plate has an injection port for injecting an injection fluid into the suction pressure space outside the spiral structure.

According to this invention, since the injection fluid is injected from the injection port into the suction pressure space outside the spiral structure, fluids having different pressures are not mixed in the compression chamber. Therefore, the performance of the scroll compressor can be improved.

It is a longitudinal cross-sectional schematic diagram of the scroll compressor which concerns on Embodiment 1 of this invention. It is a schematic longitudinal cross-sectional view of the fixed scroll of the scroll compressor which concerns on Embodiment 1 of this invention. It is sectional drawing which cut | disconnected the scroll compressor which concerns on Embodiment 1 of this invention in the spiral structure part. It is a top view of the fixed scroll of the scroll compressor which concerns on Embodiment 1 of this invention. It is sectional drawing which cut | disconnected the scroll compressor which concerns on Embodiment 2 of this invention in the spiral structure part.

Hereinafter, a scroll compressor according to an embodiment of the present invention will be described with reference to the drawings. Here, what is denoted by the same reference numeral in the following drawings including FIG. 1 is the same or equivalent, and is common to the whole text of the embodiments described below. And the form of the component represented by the whole specification is an illustration to the last, Comprising: It does not limit to the form described in the specification.

Embodiment 1 FIG.
1 is a schematic longitudinal sectional view of a scroll compressor according to Embodiment 1 of the present invention.
The scroll compressor 100 sucks the fluid circulating in the refrigeration cycle, compresses it, and discharges it as a high-temperature and high-pressure state. The scroll compressor 100 accommodates a compression unit 10 that compresses fluid, an electric motor unit 30 that drives the compression unit 10 via a main shaft 33, and other components in an airtight container 40 that forms an outer shell. It has the structure. As the fluid circulating in the refrigeration cycle, for example, a refrigerant such as R32 or carbon dioxide is used. Below, it demonstrates as what uses a refrigerant | coolant as a fluid.

The sealed container 40 has a configuration in which an upper container 41 and a lower container 43 are provided on the upper and lower parts of the intermediate container 42. The lower container 43 is an oil sump for storing lubricating oil. A suction pipe 44 for sucking refrigerant gas is connected to the intermediate container 42. A discharge pipe 45 for discharging refrigerant gas is connected to the upper container 41. An injection pipe 49 is connected above the upper container 41. An end of the upper container 41 inside the injection pipe 49 is inserted into an injection pipe insertion port 28 (see FIG. 2 described later) formed in the fixed scroll 21. The injection pipe 49 is for injecting a refrigerant introduced from the outside into a second space 71 described later. In this example, the injection refrigerant injected into the second space 71 is a low-temperature and low-pressure liquid refrigerant or a two-phase refrigerant including a low-temperature and low-pressure liquid refrigerant.

In the sealed container 40, a frame 46 and a sub-frame 47 are further arranged in the axial direction of the main shaft 33 so as to face each other with the electric motor unit 30 interposed therebetween. The frame 46 is located between the electric motor unit 30 and the compression unit 10. The sub frame 47 is located below the electric motor unit 30. The frame 46 and the sub frame 47 are fixed to the inner peripheral surface of the sealed container 40 by shrink fitting or welding.

In the first embodiment, the space in the sealed container 40 is defined as follows. A space in the sealed container 40 that is closer to the motor unit 30 than the frame 46 and into which the refrigerant sucked from the suction pipe 44 flows is referred to as a first space 70. An annular space outside the spiral structure 10 a described later and inside the inner wall of the frame 46 is defined as a second space 71. The second space 71 communicates with the first space 70 via a suction port 36 a and a suction port 36 b formed in the frame 46, and becomes a suction pressure space together with the first space 70. A space closer to the discharge pipe 45 than the compression unit 10 is a third space 72. The third space 72 is a discharge pressure space because the refrigerant compressed in the compression chamber 11 is discharged.

The compression unit 10 includes a fixed scroll 21 and a swing scroll 22.

The fixed scroll 21 is fixed to the frame 46 by bolts or the like not shown. The orbiting scroll 22 is accommodated in a cylindrical space inside the frame 46 below the fixed scroll 21 and is supported by an eccentric shaft portion 33a of the main shaft 33, which will be described later.

The fixed scroll 21 has a fixed base plate 23 and a fixed spiral body 24 that is a spiral projection standing on one surface of the fixed base plate 23. The orbiting scroll 22 includes an orbiting base plate 25 and an orbiting spiral body 26 that is a spiral projection standing on one surface of the orbiting base plate 25. The fixed scroll 21 and the swing scroll 22 are accommodated in the sealed container 40 in a state where the fixed spiral body 24 and the swing scroll body 26 are combined with each other.

In a state where the fixed spiral body 24 and the swing spiral body 26 are combined with each other, the winding directions of the fixed spiral body 24 and the swing spiral body 26 are opposite to each other. A plurality of compression chambers 11 whose volumes change relatively are formed between the fixed spiral body 24 and the swing spiral body 26. The plurality of compression chambers 11 are formed in pairs symmetrically across a central axis O of the main shaft 33 (see FIG. 3 described later). Of the plurality of pairs of compression chambers 11 thus formed, the outermost pair of compression chambers 11 is the suction chamber 12 (see FIG. 3 described later), and the innermost is the discharge chamber 13 (see FIG. 3 described later). . Hereinafter, in the compression unit 10 constituted by the orbiting scroll 22 and the fixed scroll 21, the symmetrical spiral structure portion that combines the fixed spiral body 24 and the orbiting spiral body 26 is referred to as a spiral structure body 10 a.

A discharge port 3 is formed at the center of the fixed base plate 23 of the fixed scroll 21 to discharge the compressed refrigerant gas. Around the discharge port 3, a discharge valve 5 that opens and closes the discharge port 3 and a valve presser 6 that restricts the movable range of the discharge valve 5 are fixed. And the discharge muffler 7 is being fixed to the fixed base plate 23 with the fixing member 7a so that the discharge port 3 may be covered.

The oscillating scroll 22 performs an oscillating motion without rotating with respect to the fixed scroll 21 by an Oldham ring (not shown) for preventing the rotating motion. A hollow cylindrical boss portion 27 is formed at a substantially central portion of the surface of the swing base plate 25 opposite to the surface on which the swing spiral body 26 is formed, and a swing bearing 27a is formed inside the boss portion 27. Is arranged. An eccentric shaft portion 33 a formed on the upper portion of the main shaft 33 is inserted into the swing bearing 27 a. And the inner peripheral part of the rocking | swiveling bearing 27a and the outer peripheral part of the eccentric shaft part 33a closely_contact | adhere via lubricating oil, and comprise a rocking | fluctuating bearing part.

The electric motor unit 30 is fixed to the inner peripheral surface of the sealed container 40 by shrink fitting, a rotor 32 that is rotatably accommodated on the inner peripheral side of the stator 31, and fixed to the rotor 32 by shrink fitting. The main shaft 33 is provided. The rotor 32 is rotationally driven when a voltage is applied to the stator 31, and transmits a driving force to the orbiting scroll 22 via the main shaft 33.

The main shaft 33 has an eccentric shaft portion 33a, a main shaft portion 33b, and a sub shaft portion 33c in order from the top. The eccentric shaft portion 33a is provided eccentrically with respect to the shaft center of the main shaft 33, and is rotatably engaged with the swing bearing 27a. The main shaft portion 33 b is supported by a main bearing (not shown) provided on the frame 46. A sleeve 34 is provided between the main bearing (not shown) and the main shaft portion 33b in order to smoothly rotate the main shaft portion 33b. The auxiliary shaft portion 33 c is rotatably supported by a ball bearing 48. The ball bearing 48 is press-fitted and fixed to the central portion of the sub-frame 47 provided at the lower part of the sealed container 40.

FIG. 2 is a schematic longitudinal sectional view of the fixed scroll of the scroll compressor according to Embodiment 1 of the present invention.
The fixed base plate 23 of the fixed scroll 21 is formed with an injection pipe insertion port 28 that opens to a surface opposite to the surface on which the fixed spiral body 24 is formed. Connected. Further, the fixed base plate 23 is formed with an injection port 29a and an injection port 29b that open to the surface on which the fixed spiral body 24 is formed. The formation positions of the injection port 29a and the injection port 29b on the fixed base plate 23 are the features of the first embodiment, and will be described in detail later. The guide 35a and guide 35b in FIG. 2 will also be described later.

The fixed base plate 23 is further formed with an injection path 29 that branches the injection refrigerant flowing in from the injection tube insertion port 28 into two and leads to the injection port 29a and the injection port 29b. The injection path 29 is composed of a lateral hole that penetrates the fixed base plate 23 in the surface direction.

The injection path 29 is formed by making a hole from the outside of the fixed base plate 23 with a drill or the like. If this hole is left open, the injection path 29 is connected to the high-pressure space outside the fixed base plate 23 of the fixed scroll 21. Therefore, for the purpose of preventing the high-temperature and high-pressure refrigerant in the high-pressure space from flowing into the injection path 29, leakage preventing members 51 such as bolts are inserted at both ends of the injection path 29, for example. Thereby, the injection path 29 and the high-pressure space outside the fixed base plate 23 of the fixed scroll 21 are blocked.

Subsequently, the operation of the scroll compressor 100 will be described. When a voltage is applied to the stator 31 of the electric motor unit 30, a current flows through the electric wire part of the stator 31 and a magnetic field is generated. This magnetic field works to rotate the rotor 32, and the main shaft 33 is rotationally driven together with the rotor 32. When the main shaft 33 is driven to rotate, the eccentric shaft portion 33a also rotates within the rocking bearing 27a. Then, the orbiting scroll 22 whose rotation is suppressed by an Oldham ring (not shown) performs an orbiting motion. As a result, the refrigerant is sucked into the sealed container 40 from the external refrigeration cycle via the suction pipe 44.

A part of the sucked refrigerant gas flows into the second space 71 inside the frame 46 through the suction port 36a and the suction port 36b of the frame 46. Then, the refrigerant gas is sucked from the second space 71 into the suction chamber which is the outermost chamber among the plurality of compression chambers 11, and the suction process is started. On the other hand, the remaining part of the refrigerant gas that has not been sucked into the suction chamber passes through a notch (not shown) formed in the steel plate of the stator 31 to cool the motor unit 30 and the lubricating oil.

The refrigerant sucked into the suction chamber gradually moves toward the center of the rocking scroll 22 by the rocking motion of the rocking scroll 22, and is compressed by reducing the volume. The compressed refrigerant is discharged from the discharge chamber that is the innermost chamber among the plurality of compression chambers 11, passes through the discharge port 3 of the fixed scroll 21, and is discharged from the discharge valve 5. The refrigerant discharged from the discharge valve 5 passes through the space in the discharge muffler 7, flows into the third space 72 above the compression unit 10, and is discharged outside the sealed container 40 through the discharge pipe 45.

Next, with reference to FIG. 3 and FIG. 4, the positions of the injection port 29a and the injection port 29b on the fixed base plate 23, which are features of the first embodiment, will be described.

FIG. 3 is a cross-sectional view of the scroll compressor according to Embodiment 1 of the present invention cut at the spiral structure portion. FIG. 4 is a plan view of the fixed scroll of the scroll compressor according to Embodiment 1 of the present invention.
As shown in FIG. 3, the injection port 29 a and the injection port 29 b are provided outside the spiral structure 10 a in the fixed base plate 23. By providing the injection port 29 a and the injection port 29 b at this position, the injection refrigerant is injected not into the compression chamber 11 but into the second space 71.

In the conventional method in which the injection refrigerant is injected into the compression chamber of the intermediate pressure, since refrigerants having different pressures flow into the compression chamber, mixing of refrigerants having different pressures in the compression chamber causes mixing loss, and the performance of the compressor is reduced. descend. On the other hand, in the first embodiment, the injection port 29a and the injection port 29b are provided outside the spiral structure 10a, so that the second space 71 before being sucked into the compression chamber 11 (suction chamber 12) is provided. Injection refrigerant can be injected. For this reason, refrigerants having different pressures are not mixed in the compression chamber 11 and no mixing loss occurs.

Further, in the conventional method in which the injection refrigerant is injected into the compression chamber of the intermediate pressure, the injection port communicates with the compression chamber, so that it becomes a dead volume under the operation condition where it is not necessary to perform the injection. That is, the compressed refrigerant gas is leaked to the low pressure side, causing loss due to re-expansion, and the performance of the compressor is lowered. However, in the first embodiment, since the injection port 29a, the injection port 29b, and the injection path 29 communicate with the second space 71, that is, the suction pressure space, inconvenience due to the conventional method can be solved.

Further, the fixed base plate 23 of the fixed scroll 21 is provided with a guide 35a and a guide 35b for guiding the refrigerant injected into the second space 71 from the injection port 29a and the injection port 29b into the spiral structure 10a.

Next, [the positional relationship between the injection port 29a and the injection port 29b, the guide 35a and the guide 35b, and the suction port 36a and the suction port 36b] and [the shape of the guide 35a and the guide 35b] will be described. In the configuration of this example, the set of the injection port 29a, the guide 35a and the suction port 36a and the set of the injection port 29b, the guide 35b and the suction port 36b are arranged at positions that are symmetric with respect to the central axis O. ing. Therefore, in the following description, a set of the injection port 29a, the guide 35a, and the suction port 36a is taken as an example, but the set of the injection port 29b, the guide 35b, and the suction port 36b is the same.

The guide 35a is a protrusion erected on the fixed base plate 23, and is disposed between the injection port 29a and the suction port 36a in the circumferential direction. The height of the guide 35 a is preferably the same as the height of the fixed spiral body 24 of the fixed scroll 21. The guide 35a is formed in a convex arc shape on the side opposite to the injection port 29a when seen in a plan view. Therefore, in the guide 37a, the end surface 35aa on the injection port 29a side is a circular arc surface that is convex on the opposite side to the injection port 29a. Thereby, the injection refrigerant that has flowed into the second space 71 from the injection port 29a can be efficiently guided into the spiral structure 10a.

The end surfaces 35aa and 35ba of the guide 35a and the guide 35b are not limited to arcuate surfaces, and may be flat surfaces. Further, either one of the injection port 29a and the injection port 29b may be used. In that case, one guide may be sufficient.

Next, the flow of the injection refrigerant flowing into the scroll compressor 100 will be described. The injection refrigerant that has flowed from the injection pipe 49 flows into the second space 71 from the injection port 29a and the injection port 29b via the injection path 29. The injection refrigerant flowing into the second space 71 is mixed with the low-pressure refrigerant in the second space 71, and the temperature of the refrigerant in the second space 71 is lowered. And since the refrigerant | coolant with which temperature fell is suck | inhaled in the spiral structure 10a, the temperature in the spiral structure 10a can be reduced.

Further, the injection refrigerant that has flowed into the second space 71 is guided into the spiral structure 10a by the guide 35a and the guide 35b. Two suction chambers are formed on the outermost periphery of the spiral structure 10a, and the injection refrigerant flows into each of the two suction chambers. Since the guide 35a and the guide 35b are provided in this way, the ratio of the injection refrigerant sucked into the spiral structure 10a increases, and the effect of lowering the temperature in the spiral structure 10a can be enhanced.

As described above, according to the first embodiment, the injection port 29a and the injection port 29b are provided on the fixed base plate 23 outside the spiral structure 10a. As a result, the injection refrigerant can flow into the spiral structure 10 a after flowing into the second space 71 before being sucked into the compression chamber 11 instead of into the compression chamber 11. Therefore, the temperature in the spiral structure 10a can be reduced without causing a mixing loss due to mixing of refrigerants having different pressures as in the conventional case where the injection refrigerant is injected into the compression chamber in the spiral structure. Therefore, the performance of the scroll compressor 100 can be improved.

Further, a guide 35 a and a guide 35 b are provided on the fixed base plate 23 of the fixed scroll 21. As a result, the injection refrigerant flowing into the second space 71 is guided into the spiral structure 10a by the guide 35a and the guide 35b. For this reason, the ratio of the injection refrigerant | coolant suck | inhaled in the spiral structure 10a increases, and the effect of reducing the temperature in the spiral structure 10a increases.

Since the temperature in the spiral structure 10a can be lowered in this way, the following effects can be obtained. That is, the clearance between the respective distal end portions of the fixed spiral body 24 and the swing spiral body 26 and the swing base plate 25 and fixed base plate 23 of the opposing scroll is reduced and contacted by thermal expansion. However, it is difficult for the compressor to be damaged. This effect is particularly effective when a refrigerant such as R32 that tends to increase the discharge temperature is used. When a refrigerant whose discharge temperature is likely to rise is used, the inside of the spiral structure 10a becomes high temperature under a high compression ratio condition where the discharge temperature tends to be high, the degree of reduction of the tooth tip gap is large, and the possibility of breakage of the compressor is high. Because.

Further, the following effects can be obtained by increasing the ratio of the injection refrigerant sucked into the spiral structure 10a by the guide 35a and the guide 35b. In other words, the injection refrigerant that has flowed into the second space 71 can be prevented from flowing into the first space 70 through the suction port 36a and the suction port 36b of the frame 46. Therefore, the refrigerant flowing into the first space 70 from the second space 71 is not mixed with the oil accumulated in the lower container 43 of the compressor and the oil concentration is not lowered.

In addition, the injection refrigerant passes through the injection port 29a, the injection port 29b and the injection path 29 formed on the fixed base plate 23 of the fixed scroll 21, and does not pass through the frame 46. For this reason, the frame 46 is not cooled by the injection refrigerant. Therefore, the axial dimension of the frame 46 is reduced, so that the fixed spiral body 24 and the swinging spiral body 26 are respectively connected to the respective leading ends of the opposed scroll body 25 and the stationary base plate 23 of the opposing scroll. It is possible to prevent the inconvenience that the gap is reduced and contacts and the compressor is damaged.

Embodiment 2. FIG.
In the first embodiment, the guide is provided only on the fixed scroll 21, but in the second embodiment, the guide is provided on both the fixed scroll 21 and the swing scroll 22. The following description will focus on the differences of the second embodiment from the first embodiment. Configurations not described in the second embodiment are the same as those in the first embodiment.

FIG. 5 is a cross-sectional view of the scroll compressor according to Embodiment 2 of the present invention cut at the spiral structure portion. FIG. 5 is a cross-sectional view of the spiral structure portion as viewed from the swing scroll 22 side toward the fixed scroll 21 side.
In the second embodiment, each of the fixed scroll 21 and the swing scroll 22 is configured such that a guide 37 a and a guide 37 b are provided on the swing spiral body 26 and the fixed spiral body 24.

Next, [the positional relationship between the injection port 29a and the injection port 29b, the guide 37a and the guide 37b, and the suction port 36a and the suction port 36b] and [the shape of the guide 37a and the guide 37b] will be described. In the configuration of this example, the set of the injection port 29a, the guide 37a and the suction port 36a and the set of the injection port 29b, the guide 37b and the suction port 36b are arranged at positions that are point-symmetric about the central axis O. ing. For this reason, in the following description, a set of the injection port 29a, the guide 37a, and the suction port 36a is taken as an example, but the set of the injection port 29b, the guide 37b, and the suction port 36b is the same.

The guide 37a is a protrusion that protrudes from the outer peripheral surface of the oscillating spiral body 26 toward the second space 71, and is disposed between the injection port 29a and the suction port 36a in the circumferential direction. In the guide 37a, the end surface 37aa on the injection port 29a side is a convex arc surface on the opposite side to the injection port 29a, and has the same function as the arc surface of the first embodiment. That is, the circular arc surface has a function of efficiently guiding the injection refrigerant flowing into the second space 71 from the injection port 29a into the spiral structure 10a. The end surface 37ba on the guide 37b side has a similar function.

According to the second embodiment, the same effect as in the first embodiment can be obtained. In the second embodiment, the example of the shape of FIG. 5 is shown as the configuration in which the guide is provided in both the fixed scroll 21 and the swing scroll 22, but in the configuration in which the guide is provided only in the fixed scroll 21, FIG. A shape may be applied.

Further, the end surfaces 37aa and 37ba of the guide 37a and the guide 37b are not limited to the arc surfaces as in the first embodiment, and may be flat surfaces. Further, either one of the injection port 29a and the injection port 29b may be used. In that case, one guide may be sufficient.

In each of the above embodiments, the number of suction ports of the frame 46 is two, but the number is not limited to two. Also, the number of injection ports is not limited to two.

3 discharge port, 5 discharge valve, 6 valve presser, 7 discharge muffler, 7a fixing member, 10 compression part, 10a spiral structure, 11 compression chamber, 12 suction chamber, 13 discharge chamber, 21 fixed scroll, 21a inward surface, 22 Oscillating scroll, 23 fixed base plate, 24 fixed spiral body, 25 rocking base plate, 26 rocking spiral body, 27 boss, 27a rocking bearing, 28 injection tube insertion port, 29 injection path, 29a injection port, 29b Injection port, 30 motor section, 31 stator, 32 rotor, 33 main shaft, 33a eccentric shaft section, 33b main shaft section, 33c sub shaft section, 34 sleeve, 35a guide, 35aa end face, 35b guide, 35ba end face, 36a suction port, 36b Inhalation port, 3 a guide, 37aa end face, 37b guide, 37ba end face, 40 sealed container, 41 upper container, 42 middle container, 43 lower container, 44 suction pipe, 45 discharge pipe, 46 frame, 47 subframe, 48 ball bearing, 49 injection Pipe, 51 prevention member, 70 1st space, 71 2nd space, 72 3rd space, 100 scroll compressor, O central axis.

Claims

A compression unit including a fixed scroll having a fixed spiral plate standing on a fixed base plate and a swing scroll having a swing spiral member standing on a swing base plate; In a scroll compressor that compresses fluid in a compression chamber in a spiral structure formed by combining with a dynamic spiral body,
A suction pressure space into which fluid is sucked from the outside is formed outside the spiral structure,
A scroll compressor having an injection port for injecting an injection fluid into the suction pressure space outside the spiral structure in the fixed base plate.
A frame for supporting the compression section;
The fixed scroll includes a guide that guides an injection fluid that flows into the suction pressure space from the injection port into the spiral structure between the injection port and a suction port formed in the frame in a circumferential direction. Item 2. The scroll compressor according to Item 1.
The scroll compressor according to claim 2, wherein the guide is a protrusion standing on the fixed base plate.
The scroll compressor according to claim 2, wherein the guide is a protrusion provided to protrude from an outer peripheral surface of the fixed spiral body toward the suction pressure space.
3. The scroll compressor according to claim 2, wherein the guide is a protrusion provided on each of the fixed spiral body and the oscillating spiral body and projecting from each outer peripheral surface toward the suction pressure space.
The scroll compressor according to any one of claims 2 to 5, wherein an end surface on the injection port side of the guide is a circular arc surface convex on the opposite side to the injection port.