JP2001090680A - Seal structure for scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To miniaturize a housing in the radial direction in the condition that the seal performance is secured in a scroll type compressor formed with a discharge port in a movable scroll thereof. SOLUTION: A center housing 12 is formed with an extension part 42 extended from the most outside inner peripheral surface 43 of a fixed scroll 11 to an axis thereof. A seal member 46 is assembled between the extension part 42 and the movable scroll 21. The seal member 46 is housed in an annular groove 45 formed in a surface of the extension part 42 opposite to the movable scroll 21, and energized by a pressure difference between both sides in the radial direction so as to be tightly brought in contact with a back surface of the movable scroll 21.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a seal structure for a scroll compressor.

[0002]

2. Description of the Related Art A conventional seal structure for a scroll compressor is disclosed in Japanese Patent Application Laid-Open No. 4-175483. According to the publication, as shown in FIG. 8, a groove 63 formed in a substrate 62 of a movable scroll 61 is filled with a filler 64 to seal a gap between the fixed scroll 65 and the movable scroll 61.

[0003]

However, in the publication,
Filler 6 is provided on the upper surface side (fixed scroll 65 side) of substrate 62.
In order to dispose 4, the contact surface between the fixed scroll 65 and the movable scroll 61 needs to be wide. Therefore, if a seal structure as described in the above publication is adopted in a compressor or the like in which a discharge port is formed in a movable scroll, for example, the radial length of the substrate 62 of the movable scroll 61 becomes relatively long. There is a problem that hinders the development.

In the case of a scroll compressor in which a discharge port is formed in a movable scroll, the structure is such that the discharge port communicates with a space formed on the back of the movable scroll. Therefore, a pressure load is applied to the back side of the movable scroll by the pressure of the refrigerant gas discharged from the discharge port.
If the pressure load is excessive, smooth rotation of the orbiting scroll is hindered, which causes a reduction in the reliability and durability of the orbiting scroll.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and a first object of the present invention is to provide a scroll type compressor in which a discharge port is formed in a movable scroll, in which a housing is secured in a state in which sealing properties are secured. An object of the present invention is to provide a seal structure of a scroll compressor that can be reduced in the radial direction.
A second object is to achieve the first object and to reduce an excessive pressure load applied to the back surface of the movable scroll.

[0006]

In order to solve the above-mentioned problems, the invention according to the first aspect is directed to a fixed scroll wall of a fixed scroll fixed to a housing, and a rotating shaft rotatably supported by the housing. And a movable scroll wall of a movable scroll attached at a boss portion via a bearing, and the movable scroll revolves based on the rotation of the rotating shaft, so that the movable scroll revolves through a discharge port formed in the movable scroll. In a scroll type compressor in which refrigerant gas is discharged to the rotating shaft side, the housing extends on a rear side of the movable scroll to a position radially inward of an outermost inner peripheral surface of the fixed scroll. According to this configuration, the first seal member for sealing the refrigerant gas is interposed between the extending portion and the back surface of the orbiting scroll. A first seal member is interposed between the extending portion and the movable scroll and extending from the housing to the arranged radially inward of the outermost inner peripheral surface of the scroll. Therefore, the outer diameter of the orbiting scroll can be reduced while ensuring the sealing property, and the scroll compressor is reduced in size.

According to a second aspect of the present invention, in the first aspect of the present invention, the first seal member is urged to a sealing position by a pressure difference between the chambers across the first seal member. With a mechanism.

According to this configuration, in addition to the operation of the first aspect of the present invention, since the first seal member is urged to the seal position by the pressure difference, the seal member is provided on the back side of the movable scroll. Also, the sealing property is ensured.

According to a third aspect of the present invention, in the first aspect of the invention, a second seal member is interposed at a position radially inside the first seal member, and the first seal member and the (2) an intermediate pressure between the low pressure on the outer peripheral side of the first seal member and the high pressure on the inner peripheral side of the second seal member in a region sandwiched between the second seal member and the rear surface of the movable scroll; Are formed.

According to this structure, in addition to the function of the first aspect of the present invention, an intermediate pressure chamber which is an intermediate pressure between a high pressure and a low pressure is provided on the back side of the movable scroll, so that a pressure load applied to the back of the movable scroll is provided. Is reduced.

According to a fourth aspect of the present invention, in the third aspect of the present invention, at least one of the first seal member and the second seal member that comes into contact with the back surface of the movable scroll has two sides sandwiching each other. And a seal mechanism that is urged to the sealing position by the pressure difference.

According to this configuration, in addition to the operation of the third aspect of the present invention, each seal member is urged to the sealing position by the pressure difference, so that the sealing property is ensured. According to a fifth aspect of the present invention, in the second or fourth aspect of the present invention, the seal mechanism includes an annular groove formed on a surface facing a back surface of the movable scroll. The mechanism is housed in a state in which it can be substantially in close contact with the radially outer inner peripheral surface of the annular groove and is movable in the axial direction of the rotation shaft.

According to this configuration, in addition to the operation of the second or fourth aspect of the present invention, when a pressure is applied, each seal member moves in the axial direction of the rotary shaft and is disposed at the seal position.

According to a sixth aspect of the present invention, in any one of the second to fifth aspects of the present invention, both of the seal mechanisms are annular, and at least the first seal member expands and contracts in a radial direction. It is possible.

According to this structure, in addition to the function of any one of the second to fifth aspects of the present invention, the radially expandable and contractable seal member expands in diameter in accordance with the pressure difference in each chamber. Therefore, it is located at the sealing position while absorbing dimensional errors and the like, and the sealing performance is further improved.

According to a seventh aspect of the present invention, in the first aspect of the present invention, the second sealing member is a bush formed integrally with an end of the rotary shaft. And the movable scroll.

According to this configuration, in addition to the function of the invention described in any one of the third to sixth aspects, since the second seal member seals at a position near the discharge port, a relatively wide range is provided. Intermediate pressure chamber. Therefore, the load applied to the back surface of the movable scroll is further reduced.

According to an eighth aspect of the present invention, in the seal structure of the scroll type compressor according to any one of the first to seventh aspects, a stator fixed inside the housing; An electric motor having a rotor supported by a rotating shaft is used as a drive source, and a motor chamber in which the stator and the rotor are housed serves as a passage for the refrigerant gas discharged from the discharge port.

According to this structure, in addition to the operation of the invention according to any one of claims 1 to 7, in the electric scroll compressor in which the driving source is an electric motor, the motor is a refrigerant. While being cooled by the gas, the size of the compressor can be reduced.

[0020]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS (First Embodiment) Hereinafter, a first embodiment of a scroll compressor embodying the present invention will be described with reference to FIGS.
This will be described with reference to FIG.

As shown in FIG. 1, a fixed scroll 11 is joined to a center housing 12 constituting a housing, and a motor housing 13 is joined to the center housing 12. The center housing 12 and the motor housing 13 have a shaft 1 as a rotating shaft.
4 is rotatably supported via radial bearings 15 and 16, and an eccentric shaft 17 is formed integrally with the shaft 14. The area surrounded by the inner peripheral surface of the motor housing 13 and the center housing 12 is the motor chamber 1.
It becomes 8.

A balance weight 19 and a bush 20 are supported on the eccentric shaft 17. The rotating shaft is constituted by the shaft 14, the eccentric shaft 17, and the bush 20. A movable scroll 21 is supported by the bush 20 via a needle bearing 22 as a bearing so as to be relatively rotatable so as to face the fixed scroll 11. A movable scroll wall 24 extends from a movable substrate 23 of the movable scroll 21, and a fixed spiral wall 26 that meshes with the movable scroll wall 24 extends from a fixed substrate 25 of the fixed scroll 11. The needle bearing 22 is housed in a boss 27 protruding from the rear side (left side in FIG. 1) of the movable substrate 23. Fixed substrate 25, fixed spiral wall 26, movable substrate 23
A region defined by the movable scroll wall 24 becomes a closed chamber 28 whose volume decreases in accordance with the rotation of the movable scroll 21.

On the end face of the center housing 12, a plurality (for example, four) of concave portions 29 are formed on substantially the same circumference. An annular ring 30 is accommodated in each recess 29 in a loose state. The fixed pin 31 fixed to the center housing 12 and the movable pin 32 fixed to the movable scroll 21 are fixedly inserted into the annular ring 30. The movable scroll 21 revolves with the rotation of the eccentric shaft 17, and its rotation is prevented by the annular ring 30, the fixed pin 31, and the movable pin 32.

A stator 33 as a stator is fixed to the inner peripheral surface of the motor housing 13.
A rotor 34 as a rotor is fixed at a position facing the stator 33 on the outer peripheral surface of the rotor. The stator 33 and the rotor 34 constitute an electric motor, and when the stator 33 is energized, the rotor 34 and the shaft 14 rotate integrally.

The movable scroll 21 has a discharge port 35 formed substantially at the center of the movable substrate 23. The movable scroll 21 is provided with a float valve 36 at a position facing the discharge port 35. The discharge port 35 communicates with a space (discharge chamber) 37 in the boss 27 via a float valve 36. A fluid passage 38 communicating the discharge chamber 37 and the motor chamber 18 is provided inside the shaft 14 near the bearing 15.
Is pierced. The bearing 1 of the shaft 14
A fluid passage 39 that communicates between the motor chamber 18 and the outside of the motor housing 13 is provided through the fluid passage 39 at an inner side of the motor housing 18. The refrigerant gas flowing into the closed chamber 28 from the entrance 40 of the fixed scroll 11 with the revolution of the movable scroll 21 is discharged to the discharge port 35, the fluid passage 38, the motor chamber 18, the fluid passage 39
Through the outlet of the motor housing 13 through the outlet 41.

As shown in FIG. 1, the center housing 1
2, an extension 42 is formed to extend inward along the back surface of the orbiting scroll 21. The extension portion 42 extends to a position closer to the axis than the outermost inner peripheral surface 43 of the fixed scroll 11. As shown in FIGS. 1 and 3, an annular annular groove 45 having a rectangular cross section is formed on a surface of the extension portion 42 facing the back surface of the movable scroll 21. A ring-shaped first seal member 46 shown in FIG.
Is housed. The outer diameter R of the first seal member 46 is very slightly smaller than the outer diameter of the annular groove 45. Also,
The groove width of the annular groove 45 is slightly larger than the width of the first seal member 46. Note that the groove depth of the annular groove 45 is slightly smaller than the thickness of the first seal member 46, and the first seal member 46 projects from the annular groove 45. The first seal member 46 is movable in the depth direction of the annular groove 45 (the axial direction of the shaft 14).

As shown in FIG. 3, the inside of the first seal member 46 is interposed between the discharge chambers 37 through the clearance of the bearing 22.
And the area becomes a high-pressure chamber 44 having a discharge pressure. Further, the low pressure chamber 47 having a low pressure value close to the suction pressure on the outside with the first seal member 46 interposed therebetween. Then, the first seal member 46 is urged to the seal position shown in FIG. 3 by the pressure difference between the high pressure and the low pressure. That is, the first
If the refrigerant gas leaks through the gap between the seal member 46 and the back surface of the movable scroll 21 to generate an airflow, the first seal member 46 causes the movable scroll 2
It is drawn to one side. Then, the high pressure of the discharged refrigerant gas acts as shown by the arrow in FIG. 3, and the first seal member 46 keeps the state in which the first seal member 46 is almost in close contact with the radially inner surface of the annular groove 45 in the movable scroll. 21 is urged to abut on the back surface of the hologram. In this manner, the first seal member 46 is urged to the seal position shown in FIG.

Therefore, in this embodiment, the following effects can be obtained. (1) Since the first seal member 46 is attached to the extension portion 42 of the center housing 12 extending radially inward from the outermost inner peripheral surface 43 of the fixed scroll 11, the movable scroll can be maintained in a state where the sealing property is secured. 21 can be made smaller. As a result, the scroll compressor can be reduced in size as the diameter of the movable scroll 21 decreases.

(2) The sealing member 4 is arranged so as to be in contact with the movable scroll due to the pressure difference between the high pressure chamber 44 and the low pressure chamber 47.
6 is urged to the sealing position, so that the sealing performance can be ensured. (3) An annular groove 45 for accommodating the first seal member 46
Is formed on the side of the center housing 12, the first seal member 46 comes into contact with the orbiting scroll 21 regardless of the revolving position of the orbiting scroll 21 and the extension 42
The surface to be secured for the side seal can be reduced.

(4) The scroll compressor according to the present embodiment can cool the motor in the motor housing 13 by sending the refrigerant gas into the motor chamber 18 and, furthermore, the sealing property is ensured. Gas in closed chamber 28
Or leak out of the housing.

(5) Since the fluid passages 38 and 39 through which the refrigerant gas flows are provided inside the shaft 14, the radial length of the compressor can be relatively shortened, which contributes to downsizing of the compressor. (6) Since the groove depth of the annular groove 45 is smaller than the thickness of the seal member 46, the seal member 46 acts as a cushioning material between the rear surface of the orbiting scroll 21 and the extending portion 42, and is resistant to seizure. Can be improved.

(Second Embodiment) Next, a second embodiment will be described with reference to FIG.
This will be described with reference to FIG. In the present embodiment, the point that the seal member is provided double on the back side of the movable scroll is the first aspect.
This is different from the embodiment, and the other configuration is the same. The same parts as those in the first embodiment are denoted by the same reference numerals, and detailed description is omitted.

As shown in FIG. 4 and FIG.
Is formed with an annular groove 49 on the surface facing the rear surface of the movable scroll 21. A ring-shaped second seal member 50 is accommodated in the annular groove 49 so as to be movable in the axial direction of the shaft 14. As shown in FIG.
Is slightly larger than the width of the second seal member 50. In addition, the groove depth of the annular groove 49 is the second seal member 5.
The thickness of the second seal member 50 is slightly smaller than the thickness of the annular seal 49. Further, the sealing performance of the second sealing member 50 is not so much pursued, and the refrigerant gas may leak to some extent. Also, due to its structure,
A small amount of refrigerant gas leaks out of the seal member 46 as well. A seal member 48 that seals the refrigerant gas in the motor chamber 18 is interposed between the shaft 14 and the inner peripheral surface of the center housing 12.

By providing the second seal member 50,
An intermediate pressure chamber 51 is provided between the high pressure chamber 44 and the low pressure chamber 47. The intermediate pressure chamber 51 has a pressure value between the high pressure chamber 44 and the low pressure chamber 47, and as shown in FIG.
By interposing the second seal member 50, the high-pressure chamber 44, the intermediate-pressure chamber 51, and the low-pressure chamber 47 in which the indoor pressure gradually decreases in order from the axis side. That is, the first seal member 46 and the second seal member 5 from which the refrigerant gas leaks slightly
0 both function as a kind of aperture, and the first seal member 4
An intermediate pressure chamber 51 is formed between the pressure chamber 6 and the second seal member 50.

By providing the intermediate pressure chamber 51 having a lower pressure than the high pressure chamber 44 communicating with the discharge port 35, the load applied to the movable scroll 21 by the pressure applied to the back surface of the movable scroll 21 to the axial fixed scroll 11 side can be reduced. This is reduced as compared with the case where the second seal member 50 is not provided. Therefore, a smooth revolution of the movable scroll 21 is obtained, and the mechanical loss of the movable scroll 21 is reduced.

Accordingly, in this embodiment, the following effects can be obtained in addition to the downsizing of the compressor and the sealing property, similarly to the effects (1) to (4) described in the first embodiment. . (5) Since the intermediate pressure chamber 51 having a lower indoor pressure than the high pressure chamber 44 is formed between the high pressure chamber 44 and the low pressure chamber 47, the load applied to the back side of the movable scroll 21 can be reduced. As a result, the orbit of the orbiting scroll 21 can be smoothly revolved, and the mechanical loss of the orbiting scroll 21 is reduced, so that the reliability and durability of the compressor can be improved.

(6) Since the second seal member 50 is provided to provide the intermediate pressure chamber 51 having a pressure value between the discharge pressure and the suction pressure, the seal accuracy is increased so as to have a high sealing property. There is no need to pursue this, and the manufacture of the second seal member 50 and the annular groove 49 can be simplified.

(7) Since a double sealing structure is provided by the first sealing member 46 and the second sealing member 50, a high sealing effect can be obtained. Note that the embodiment is not limited to the above, and for example, may be changed as follows.

In both embodiments, the seal member may be expandable and contractible in the radial direction. For example, as shown in FIG. 7A, a seal member 53 having a divided portion 52 formed by making a cut at an angle may be used. In this case, at the time of assembly, the pressure difference between the high pressure side and the low pressure side causes
As shown in FIG. As described above, since the diameter of the seal member 53 is increased so as to abut the outer peripheral walls of the annular grooves 45 and 49, the annular grooves 45 and
49 can be absorbed, and high sealing performance can be ensured.

The seal member may have another structure as long as it can be expanded and contracted. For example, the sliding surface may be a rubber material having a low friction surface treatment. In both embodiments, the annular grooves 45 and 49 may be formed on the back surface of the movable scroll 21 instead of the center housing 12 and the bush 20.

In the second embodiment, the intermediate pressure chamber 51
Is not limited to one, and two or more may be provided. In this case, the sealability is further improved by the multiple structure of the seal. In the second embodiment, the second seal member 50 is not limited to being interposed between the bush 20 and the movable scroll 21. For example, the diameter of the eccentric shaft 17 may be formed to be relatively large, and may be interposed between the eccentric shaft and the orbiting scroll 21.

In the second embodiment, the shaft 14
And a fluid passage communicating the discharge chamber 37 with the outside of the housing. In this case, the seal member 48 between the shaft 14 and the center housing 12 need not be interposed.

The first seal member 46 located at the extension portion 42 may be arranged at the same position in the axial direction as the outermost inner peripheral surface 43 of the fixed scroll 11. Even in this case, it is possible to reduce the size of the compressor while ensuring the sealing performance.

○ Shaft 14 and center housing 1
The seal between the inner peripheral surface of the second member and the inner peripheral surface of the second member may be performed by using, for example, a lip seal or a sealed bearing. ○ The scroll compressor is not limited to the one in the present embodiment. For example, the seal structure of the present embodiment may be adopted in another scroll compressor in which the driving source is an engine.

The technical ideas other than the claims that can be grasped from the embodiment and other examples will be described below together with their effects. (1) The fixed scroll wall of the fixed scroll fixed to the housing meshes with the movable scroll wall of the movable scroll attached to the rotary shaft rotatably supported by the housing via a bearing via a bearing. In a scroll compressor in which refrigerant gas is discharged to the rotation shaft side through a discharge port formed in the movable scroll by revolving the movable scroll based on rotation of a rotating shaft, the refrigerant gas is discharged from the discharge port. At least one sealing member for sealing a gas path through which the refrigerant gas passes from the outer peripheral sliding surface between the movable scroll and the fixed scroll through the back surface of the movable scroll to the interior where the two spiral walls mesh with each other. A plurality of ones are interposed on the gas path so as to be positioned on the back side of the orbiting scroll, and the at least two seal members Intermediate pressure chamber facing the rear of the movable scroll with the sealed compartment is formed.

(2) In claim 1, a back chamber communicating with the discharge port through the bearing is formed on the back side of the orbiting scroll, and the pressure applied to the back chamber by the first seal member is reduced. Separate the rear compartment differently.
In this case, the rear chamber is a high-pressure chamber (44), a low-pressure chamber (47).
Is a partitioned room.

(3) In claim 1, a flow passage (38, 39) for the refrigerant gas discharged from the discharge port is provided inside the rotary shaft. In this case, the length in the radial direction of the scroll compressor can be relatively shortened, which can contribute to downsizing of the compressor.

[0048]

As described above in detail, according to the first aspect of the present invention, the diameter of the movable scroll can be reduced while the sealing property is secured, and the scroll compressor can be reduced in size.

According to the invention described in claim 2, according to claim 1
In addition to the effects of the invention described in the above, the first seal member is urged to the seal position by the pressure difference between the respective chambers across the first seal member, so that the sealing performance can be ensured.

According to the third aspect of the present invention, the first aspect is provided.
In addition to the effects of the invention described in (1), the load from the rear side of the movable scroll is reduced, so that the reliability and durability of the scroll compressor can be improved.

According to the invention described in claim 4, according to claim 3,
In addition to the effects of the invention described in (1), the first seal member and the second seal member are urged to the seal position by the pressure difference in each chamber, so that the sealing performance can be ensured.

According to the invention described in claim 5, according to claim 2
Alternatively, in addition to the effect of the invention described in claim 4, since the seal mechanism is a mechanism that allows the seal member to move in the axial direction when pressure is applied, the seal member is moved in the axial direction to move to the seal position. Can be located.

According to the invention described in claim 6, claim 2 is provided.
In addition to the effects of the inventions described in the fifth to fifth aspects, the expandable and contractible seal member expands in diameter according to the pressure difference in each chamber, so that the sealability can be further improved.

According to the invention of claim 7, according to claim 3,
In addition to the effects of the invention according to any one of claims 6 to 6, the seal is sealed at a position close to the discharge port, so that the intermediate pressure chamber can be provided in a relatively wide range, and the intermediate pressure chamber can be provided on the back surface of the movable scroll. The pressure is reduced, and the pressure load can be further reduced.

According to the eighth aspect of the present invention, the first aspect is provided.
In addition to the effects described in any one of claims 7 to 7, in a case where the driving source is an electric scroll compressor having a motor, the motor can be cooled and the compressor can be cooled in a state where the sealing property is secured. Can be downsized.

[Brief description of the drawings]

FIG. 1 is a side sectional view of a scroll compressor according to a first embodiment.

FIG. 2 is a front view of the first sealing member.

FIG. 3 is an enlarged sectional side view of a state where a first seal member is located at a seal position.

FIG. 4 is a side sectional view of a scroll compressor according to a second embodiment.

FIG. 5 is an enlarged sectional side view of a state where the first and second seal members are located at a seal position.

FIG. 6 is a sectional view taken along line II-II of FIG. 4;

FIGS. 7A and 7B show another example of a seal member, in which FIG. 7A is a front view of the seal member, and FIG.

FIG. 8 is a partial sectional side view of a conventional scroll compressor.

[Explanation of symbols]

11: fixed scroll, 12: center housing constituting a housing, 14: shaft as a rotating shaft, 2
0: bush, 22: needle bearing as bearing, 23: movable board, 24: movable spiral wall, 25: fixed board, 26: fixed spiral wall, 27: boss, 33: stator as stator, 34: rotation Rotor as child, 35 ...
Discharge port, 42 ... extension part, 43 ... outermost inner peripheral surface, 45 ...
An annular groove constituting a seal mechanism, 46... A first seal member,
48: a sealing member as a second sealing member; 49, an annular groove constituting a sealing mechanism; 50: a second sealing member, 53
... Seal member.

 ──────────────────────────────────────────────────続 き Continued on the front page F term (reference) 3H029 AA02 AA16 AB03 BB01 BB16 CC03 CC05 CC07 CC09 CC19 CC22 3H039 AA02 AA12 BB15 CC02 CC03 CC09 CC27 CC31 CC32 CC33

Claims (8)

[Claims] 1. A fixed scroll wall of a fixed scroll fixed to a housing meshes with a movable scroll wall of a movable scroll mounted at a boss via a bearing on a rotating shaft rotatably supported by the housing. A scroll compressor in which refrigerant gas is discharged to the rotating shaft side through a discharge port formed in the movable scroll when the movable scroll revolves based on rotation of the rotating shaft; On the back side of the movable scroll, an extending portion extending to a position radially inward from the outermost inner peripheral surface of the fixed scroll is provided, and a refrigerant gas is sealed between the extending portion and the back surface of the movable scroll. Structure of a scroll-type compressor in which a first seal member is provided. 2. The seal according to claim 1, further comprising a seal mechanism for urging the first seal member to a sealing position by a pressure difference between the chambers sandwiching the first seal member. Construction. 3. A second seal member is interposed at a position radially inward of the first seal member, and a back surface of the movable scroll is provided in a region sandwiched between the first seal member and the second seal member. 2. The scroll according to claim 1, wherein an intermediate pressure chamber that faces and creates an intermediate pressure between a low pressure on an outer peripheral side of the first seal member and a high pressure on an inner peripheral side of the second seal member is formed. Type compressor seal structure. 4. A seal mechanism that is urged to a seal position by a pressure difference between both sides of at least one of the first seal member and the second seal member that abuts on the back surface of the movable scroll. The seal structure of the scroll compressor according to claim 3. 5. The seal mechanism is provided in such a manner that the seal member can be substantially in close contact with a radially outer inner peripheral surface of the annular groove formed in an annular groove formed on a surface of the movable scroll facing the back surface. The seal structure of a scroll compressor according to claim 2 or 4, wherein the mechanism is a mechanism housed in a state movable in the axial direction of the rotating shaft. 6. The two seal members are both annular,
The seal structure for a scroll compressor according to any one of claims 2 to 5, wherein at least the first seal member is expandable and contractable in a radial direction. 7. The movable seal according to claim 3, wherein the second seal member is interposed between the movable scroll and a bush formed integrally with an end of the rotary shaft. 3. The seal structure of a scroll compressor according to item 1. 8. An electric motor having a stator fixed inside the housing and a rotor supported on the rotating shaft as a drive source, and a motor chamber accommodating the stator and the rotor is provided. The seal structure for a scroll type compressor according to any one of claims 1 to 7, wherein the seal structure is a flow passage for the refrigerant gas discharged from the discharge port.