JP4635893B2 - Horizontal scroll compressor - Google Patents

Description

  The present invention relates to a horizontal scroll compressor in which the orbiting axis of the orbiting scroll body is horizontal.

A conventional horizontal scroll compressor has a fixed scroll body having a fixed substrate fixed in a housing and a fixed spiral wall erected on the front surface of the fixed substrate.
A movable scroll wall meshing with the fixed spiral wall has a movable scroll body standing on the front surface of the movable substrate, and a compression chamber partitioned between the fixed spiral wall and the movable spiral wall.
Further, in this type of scroll compressor, a front fixed wall that is in sliding contact with the front surface of the movable scroll body is provided on the fixed substrate in the housing.
In addition, a shaft support member that is in sliding contact with the back surface of the movable scroll body is provided, and a back pressure region is defined on the back surface of the movable scroll body.
The scroll compressor compresses refrigerant, which is a compressible fluid, by reducing and moving the volume in the compression chamber due to the turning motion of the movable scroll body.

By the way, in this type of scroll compressor, the movable scroll body is subjected to a thrust force (positive pressure) according to the pressure in the compression chamber.
As the pressure in the compression chamber increases, the positive pressure also increases. When the positive pressure increases, the load on the sliding portion of the movable scroll body becomes large, which is a factor that impairs the reliability of the scroll compressor.

Therefore, conventionally, like the scroll compressor disclosed in Patent Document 1, an introduction passage that connects the discharge pressure region and the back pressure region is provided, and this introduction passage slides between the movable scroll body and the front fixed wall. The configuration that goes through the part is adopted.
Then, the clearance (gap) of the sliding portion changes according to the displacement of the movable scroll body in the contact / separation direction with respect to the front fixed wall, thereby changing the gas cross-sectional area in the clearance and the pressure in the back pressure region. Is adjusted.

For example, when the pressure in the compression chamber becomes low and the positive pressure acting on the movable scroll body falls below the thrust force (back pressure) caused by the pressure in the back pressure area, the movable scroll body approaches the front fixed wall due to the back pressure. It is displaced in the direction to do.
That is, the clearance of the sliding portion between the movable scroll body and the front fixed wall is minimized, the introduction of gas from the discharge pressure region in the clearance is prevented, and the pressure in the back pressure region tends to decrease.

Conversely, when the pressure in the compression chamber increases and the positive pressure acting on the movable scroll body exceeds the back pressure, the movable scroll body is displaced in a direction away from the front fixed wall by the positive pressure.
For this reason, the gap (clearance) between the movable scroll body and the front fixed wall is maximized, the introduction of the refrigerant is promoted to the clearance with the maximum opening, and the pressure in the back pressure region tends to increase.

Another conventional technique is the scroll compressor disclosed in Patent Document 2.
This scroll compressor is of a vertical type and is provided with a seal member that divides a back pressure region in the housing into two spaces.
The seal member has a groove for supplying lubricating oil to a sliding portion between the fixed scroll body and the movable scroll body.
The supply amount of the lubricating oil can be controlled by adjusting the number, width, and depth of the groove of the seal member.
JP 2005-180345 A JP-A-8-121366

However, in the horizontal scroll compressor disclosed in Patent Document 1, the atmosphere in the back pressure region and the suction pressure region may be liquid, or may be in a mist or gas state.
This is due to the fact that in the horizontal scroll compressor, the atmosphere in the back pressure region and the suction pressure region is not uniform in the vertical direction.
Usually, the atmosphere in the upper part of the back pressure region and the suction pressure region tends to become gas, and tends to become liquid or mist in the lower part with respect to the upper part.
If the atmosphere in the back pressure area and the suction pressure area is not uniform, the back pressure corresponding to the discharge pressure cannot be realized in the back pressure area, and excessive back pressure may occur or the back pressure may be insufficient. .
If excessive back pressure occurs in the back pressure region, the frictional force at the sliding part increases, which increases the power loss, and if the back pressure is insufficient, the medium leaks from the compression chamber. It causes a compression failure, and the performance as a compressor is lowered.
In particular, even if the back pressure is controlled by providing passages in the back pressure area and the suction area, if the passage exists only at a position corresponding to the lower part, the oil is slid due to clogging of lubricating oil or refrigerant liquid in the passage. There is a high possibility that the frictional force of the moving part will increase and compression failure will occur.
As described above, the conventional horizontal scroll compressor has a problem that the intended back pressure may not be set in the back pressure region when the atmosphere in the back pressure region and the suction pressure region is not uniform.

On the other hand, in the scroll compressor described in Patent Document 2, a groove is provided in the sealing material. However, this type of scroll compressor is a vertical type, and a back pressure region in the horizontal type scroll compressor. And there is no problem regarding the atmosphere in the suction pressure region.
Furthermore, the groove of the sealing material in this technique is not a groove communicating the suction pressure region and the back pressure region, and the idea of controlling the back pressure in the back pressure region via the groove of the sealing material is not disclosed.

  The present invention has been made in view of the above problems, and an object of the present invention is to set an intended back pressure in the back pressure region even when the atmosphere in the back pressure region and the suction region is not uniform. Accordingly, it is an object of the present invention to provide a horizontal scroll compressor that can reduce the risk of being not.

In order to achieve the above object, the present invention provides a fixed scroll body having a fixed substrate fixed in a housing, a fixed spiral wall standing on the front surface of the fixed substrate, and a movable spiral wall meshing with the fixed spiral wall. A movable scroll body standing on the front surface of the movable substrate, a compression chamber partitioned between the fixed spiral wall and the movable spiral wall, and a back side sliding contact body that is in sliding contact with the rear surface of the movable substrate are provided. A back pressure region is defined on the back surface of the movable substrate, the back pressure region and the discharge pressure region are communicated via an introduction passage, and a suction pressure region is defined separately from the back pressure region, The compressive fluid is compressed by reducing and moving the volume in the compression chamber due to the turning motion, and the back pressure is generated by the displacement of the movable scroll body in the contact / separation direction between the fixed substrate and the back side sliding contact body. Area pressure In the horizontal scroll compressor that adjusts, an annular seal member that interrupts the back pressure region and the suction pressure region is interposed between the movable substrate and the back side sliding contact body, and the annular seal member is The movable scroll body is mounted in a mounting groove carved in the movable scroll body, and has a plurality of groove sections, and the groove section is a narrow groove formed in a radial direction on an end surface of the annular seal member, and the movable scroll body Is displaced in a direction away from the back side sliding contact body, and when a gap is obtained between the movable substrate and the back side sliding contact body, the back pressure region and the suction pressure region are communicated with each other and are farthest from each other. For the groove, the shortest circumferential distance between the grooves on the circumference of the annular seal member is set to one third or more of the circumferential length of the annular seal member, and the introduction passage is connected to the fixed substrate and the movable Between the board When the movable scroll body is displaced in a direction to separate the movable substrate from the fixed substrate and a gap is generated between the movable substrate and the fixed substrate, the back pressure region and the discharge pressure are provided. It is characterized by communicating with an area .

According to the present invention, the movable substrate of the movable scroll body and the fixed substrate of the fixed scroll body are utilized by utilizing the fact that the pressure of the discharge pressure region and the pressure of the back pressure region act in opposite directions with respect to the movable scroll body. By forming a part of the introduction passage in the sliding contact portion and a plurality of groove portions made of an annular seal member in the sliding contact portion between the movable substrate of the movable scroll body and the back side sliding contact body, The movable scroll body only moves in any one of the axial directions, communicates the discharge pressure region and the back pressure region, blocks the back pressure region and the suction pressure region, or conversely discharges the pressure region and the back pressure region. The action of blocking the pressure area and communicating the back pressure area and the suction pressure area can be performed simultaneously. For this reason, the pressure in the back pressure region can be adjusted appropriately.
Moreover, a narrow groove having a groove iris function of the annular sealing member, by flowing the medium back pressure region to the low pressure of the suction pressure region than the back pressure region, the back pressure of the back pressure region is adjusted. Further, the atmosphere in the back pressure region and the suction pressure region is not uniform because the shortest circumferential distance between the furthest grooves on the circumferential length of the annular seal member is set to one third or more. Thus, even if the annular seal member moves in the circumferential direction along with the revolving motion of the movable scroll body, one of the grooves functions as a diaphragm. For example, if the atmosphere in the back pressure region and the suction pressure region is liquid at the lower part and gas at the upper part, even if the groove part corresponding to the lower part is clogged with liquid or the like, the back of the back pressure area is restricted by the restriction of the upper groove part corresponding to the gas. The pressure is properly controlled.
On the other hand, when the introduction passage communicates, the medium in the discharge pressure region is introduced into the back pressure region through the introduction passage. As a result, the pressure in the back pressure region increases and the back pressure that presses the movable scroll body against the fixed scroll body increases, and the contact pressure between the movable substrate of the movable scroll body and the back side sliding contact body is reduced, and the movable substrate is reduced. The frictional force on the back side of the is reduced. Power loss can be reduced by reducing the frictional force, which contributes to the improvement of the performance of the horizontal scroll compressor. Moreover, the adhesion of the movable scroll body to the fixed scroll body is improved by increasing the pressure in the back pressure region. By improving the degree of adhesion between the movable scroll body and the fixed scroll body, leakage of the compressible fluid from the compression chamber is prevented. The prevention of leakage improves the compression efficiency, and the improvement of the compression efficiency contributes to the improvement of the performance of the horizontal scroll compressor.

In the horizontal scroll compressor, the groove portion may be composed of a plurality of narrow grooves arranged at minute intervals.
In this case, the plurality of narrow grooves arranged at minute intervals constitute the groove portion of the seal member, thereby suppressing the strength reduction in the groove portion of the seal member and setting the width of the groove portion substantially freely. There are advantages that can be achieved.

In the horizontal scroll compressor, a second annular seal member having a diameter smaller than that of the annular seal member is interposed between the movable substrate and the back side sliding contact body, and the second annular seal is provided. The member may have a plurality of second grooves that communicate the back pressure region and the suction pressure region.
In this case, since the groove portions are provided in the annular seal member and the second annular seal member, the back pressure in the back pressure region is controlled through the respective groove portions, and the risk that the intended back pressure is not set in the back pressure region is more reliably reduced. can do.

In the horizontal scroll compressor, an oil separator may be provided in the discharge pressure region, and the introduction passage may allow passage of oil collected in the oil separator.
In this case, since the lubricating oil separated by the oil separator is stored in the discharge pressure region, the atmosphere in the back pressure region and the suction pressure region is less likely to be uniform. The effect of further reducing the possibility of not being set becomes more prominent.

  According to the present invention, there is provided a horizontal scroll compressor that can reduce the possibility that the intended back pressure is not set in the back pressure region even when the atmosphere in the back pressure region and the suction region is not uniform. Can be provided.

(First embodiment)
Hereinafter, a horizontal scroll compressor according to a first embodiment of the present invention will be described.
The horizontal scroll compressor (hereinafter simply referred to as “compressor”) of this embodiment is a compressor that constitutes a part of a refrigeration circuit of an in-vehicle air conditioner.
Carbon dioxide is used as a refrigerant as a compressive fluid used in the refrigeration circuit.
1 is a longitudinal sectional view of a compressor according to a first embodiment, FIG. 2 is an enlarged longitudinal sectional view showing an essential part of the compressor, and FIG. 3 is a perspective view showing an annular seal member. FIG. 4 is a view taken along line AA in FIG.

As shown in FIG. 1, the housing 11 of the compressor 10 of the first embodiment is formed by joining and fixing a first housing body 12 and a second housing body 13.
The first housing body 12 has a bottomed cylindrical shape, and the bottom portion 12a of the first housing body 12 is disposed on the left side in FIG.
The second housing body 13 is a lid-like body having a plurality of spaces partitioned by the partition wall 13 a and covers the opening side end of the first housing body 12.

An annular bearing rib 12b is formed at the center of the inner wall of the bottom 12a of the first housing body 12 toward the opening side.
Near the end of the first housing body 12 on the opening side, a shaft support member 14 is accommodated and fixed.
The shaft support member 14 includes a cylindrical portion 15 having an insertion hole 15a and a bearing accommodating portion 15b, and a flange portion 16 formed by expanding the diameter from the opening side of the first housing body 12 of the cylindrical portion 15.
The outer peripheral portion of the flange portion 16 is closely fitted to the inner peripheral wall of the first housing body 12.
For this reason, the space part in the first housing body 12 is divided into two by the shaft support member 14 into a space part on the bottom 12a side and a space part on the opening side.

A rotating shaft 17 is accommodated in the first housing body 12.
One shaft end of the rotating shaft 17 is rotatably supported by a bearing 18 mounted in the bearing rib 12b, and the other end portion is another bearing housed in the bearing housing portion of the shaft support member 14. 19 is rotatably supported.
The space on the bottom 12 a side of the first housing body 12 constitutes the motor chamber 20, and the stator 21 is fixed along the inner peripheral wall of the motor chamber 20.
A rotor 22 accommodated in the stator 21 is fixed to the rotating shaft 17 in the motor chamber 20.
As described above, the stator 21 and the rotor 22 constitute an electric motor in the compressor 10, and the stator 21 and the rotating shaft 17 are integrally rotated by supplying power to the stator 21.

By the way, the fixed scroll body 25 is accommodated in the space portion on the opening side of the first housing body 12, and the fixed scroll body 25 is positioned closer to the opening end side of the first housing body 12 than the shaft support member 14. It is fixed to the first housing body 12.
Between the fixed scroll body 25 and the shaft support member 14, a movable scroll body 35 that is turned by the rotation of the rotary shaft 17 is disposed.
The fixed scroll body 25 will be described. The fixed scroll body 25 includes a disk-shaped fixed substrate 26, an outer peripheral wall 27 erected near the outer peripheral edge in front of the fixed substrate 26, and a fixed substrate on the inner diameter side of the outer peripheral wall 27. 26 is composed of a fixed spiral wall 28 erected on 26.
In the present invention, the surface of the fixed substrate 26 that faces the movable scroll body 35 is the front surface of the fixed substrate 26 or the fixed scroll body 25.
Therefore, as shown in FIG. 1, the outer peripheral wall 27 and the fixed spiral wall 28 are erected on the front surface of the fixed substrate 26.
A seal member 29 is attached to the tip of the fixed spiral wall 28.
The distal end of the outer peripheral wall 27 is joined to the vicinity of the outer periphery of the flange portion 16 of the shaft support member 14.

Meanwhile, an eccentric shaft 30 having an axis Q that is eccentric with respect to the axis P of the rotating shaft 17 is provided at the end of the rotating shaft 17 on the opening side.
A cylindrical bush 31 is fitted on the eccentric shaft 30, and an inner ring of an eccentric bearing 32 is mounted on the outer periphery of the bush 31.
A movable scroll body 35 is supported on the outer ring of the eccentric bearing 32.
The bush 31 is provided with a balancer 33, and the balancer 33 is a member for reducing the unevenness of the rotating shaft 17 due to the uneven distribution of the movable scroll body 35 around the axis.

The movable scroll body 35 includes a disk-shaped movable substrate 36, an outer peripheral wall 37 erected in the vicinity of the outer peripheral edge of the back surface of the movable substrate 36, and a movable spiral erected on the inner diameter side of the outer peripheral wall 37 in front of the movable substrate 36. A wall 38 and a bearing accommodating portion 39 that accommodates the outer ring of the eccentric bearing 32 are provided.
In the present invention, one surface of the movable substrate 36 facing the fixed scroll body 25 is the front surface of the movable substrate 36 or the movable scroll body 35.
Therefore, as shown in FIG. 1, the movable spiral wall 38 is erected on the front surface of the movable substrate 35.
A seal member 40 is attached to the tip of the movable spiral wall 38.
In this embodiment, an annular outer peripheral wall 37 standing from the outermost periphery of the back surface of the movable substrate 36 is provided, and the tip of the outer peripheral wall 37 is slidably in contact with the flange portion 16 of the shaft support member 14. .
Accordingly, the shaft support member 14 corresponds to a back side sliding contact body with respect to the movable scroll body 35.
An annular seal member 34 is attached to the distal end portion of the outer peripheral wall 37 of the movable scroll body 35.
The annular seal member 34 will be described in detail later.

The movable spiral wall 38 in the movable scroll body 35 and the fixed spiral wall 28 in the fixed scroll body 25 are engaged with each other.
The tip of the movable spiral wall 38 abuts against the fixed substrate 26 and is slidable with respect to the fixed substrate 26.
On the other hand, the tip of the fixed spiral wall 28 is slidably in contact with the movable substrate 36 in the same manner.
Therefore, a compression chamber 41 is defined between the fixed scroll body 25 and the movable scroll body 35 by the fixed substrate 26, the movable substrate 36, the fixed spiral wall 28 and the movable spiral wall 38.
A plurality of pins 42 as rotation avoidance means for the movable scroll body 35 are provided between the back surface of the movable substrate 36 and the flange portion 16 of the shaft support member 14.

A suction chamber 43 that is a suction pressure region is defined by the outer peripheral wall 27 of the fixed scroll body 25, the outer peripheral wall 37 of the movable scroll body 35, and the flange portion 16 of the shaft support member.
A suction passage 44 that communicates the suction chamber 43 and the motor chamber 20 is provided in the flange portion 16 of the shaft support member 14.
The first housing body 12 is formed with a suction port 45 communicating with the motor chamber 20, and the suction port 45 is connected to the low pressure side of the external refrigerant circuit.
Therefore, when the compressor 10 is operated, the low-pressure refrigerant is introduced into the suction chamber 43 through the suction port 45, the motor chamber 20, and the suction passage 44.
Therefore, in this embodiment, the motor chamber 20 and the suction chamber 43 correspond to a suction pressure region.

On the other hand, a discharge chamber 48, an oil separation chamber 49, and an oil recovery chamber 50 are defined in the second housing body 13 in the housing 11.
A discharge hole 26 a is formed in the center of the fixed scroll body 25, and a reed check valve 46 is provided on the outlet side of the discharge hole 26 a facing the discharge chamber 48.
In this embodiment, a partition member 47 is interposed between the second housing body 13 and the fixed scroll body 25, and the partition member 47 together with the partition wall 13 a of the second housing body 13, the discharge chamber 48 and the oil recovery chamber 50. Means for partitioning.
The discharge chamber 48 and the oil separation chamber 49 are partitioned by the partition wall 13a, and the oil separation chamber 49 and the oil recovery chamber 50 are also partitioned by the partition wall 13a.
The partition wall 13 a includes a passage 51 that communicates the discharge chamber 48 and the oil separation chamber 49, and a passage 52 that communicates the oil separation chamber 49 and the oil recovery chamber 50.

The oil separation chamber 49 is provided with an oil separator 53 so that the lubricating oil contained in the refrigerant having the discharge pressure can be recovered.
The oil separator 53 is connected to the high pressure side of the external refrigerant circuit.
The lubricating oil separated by the oil separator 53 can supply the lubricating oil in the oil separation chamber 49 to the oil recovery chamber 50 through the passage 52.
For this reason, when the compressor 10 is operated, the compressed high-pressure refrigerant is led to the external refrigerant circuit through the discharge hole 26a, the discharge chamber 48, the oil separation chamber 49, and the oil separator 53.
The discharge chamber 48, the oil separation chamber 49, and the oil recovery chamber 50 correspond to a discharge pressure region.

Next, adjustment of the back pressure applied to the movable scroll body 35 will be described.
The partition member 47 has a partition-side through hole 55 penetrating from the oil recovery chamber 50 to the vicinity of the outer periphery of the back surface of the fixed substrate 26.
The oil recovery chamber 50 side of the through hole 55 is covered with a filter 56, and is for separating foreign matter in the lubricating oil flowing from the oil recovery chamber 50 to the through hole 55.
On the other hand, a fixed side through hole 57 connected to the partition side through hole 55 is formed near the outer periphery of the fixed scroll body 25, and the fixed side through hole 57 penetrates from the back surface of the fixed substrate 26 to the front.
A front fixed wall 26b is formed in the vicinity of the outer periphery (the inner diameter side of the outer peripheral wall 27) on the front surface of the fixed substrate 26, and the fixed side through hole 57 reaches the front fixed wall 26b.

The opening in the front fixed wall 26 b of the fixed side through hole 57 faces the vicinity of the front outer periphery of the movable substrate 36 in the movable scroll body 35.
The vicinity of the front periphery of the movable substrate 36 is in sliding contact with the front fixed wall 26 b that is near the front periphery of the fixed substrate 26.
A minute gap (clearance) is set between the movable substrate 36 and the front fixed wall 26 b of the fixed substrate 26.
This gap constitutes a gap that realizes a slight movement of the orbiting movable scroll body 35 in the direction of the axis P.
As shown in FIG. 2, a tip seal 58 that blocks the opening of the fixed side through hole 57 and the suction chamber 43 in the fixed substrate 26, and another chip seal 59 that blocks the opening of the fixed side through hole 57 and the compression chamber 41. Is provided.

Near the outer periphery of the front surface of the movable substrate 36 facing the front fixed wall 26b, a movable side through hole 60 penetrating from the gap (clearance) to the back surface of the movable substrate 36 is formed.
The opening of the movable side through hole 60 facing the back surface of the movable substrate 36 is located inside the outer peripheral wall 37.
The space inside the outer peripheral wall 37 of the movable substrate 36 constitutes a back pressure chamber 61 as a back pressure region defined by the back surface of the movable substrate 36 and the inner wall surface of the shaft support member 14.
A shaft seal member 62 that separates the back pressure chamber 61 and the motor chamber 20 is held by a retaining ring 63 attached to the inner wall surface of the shaft support member 14.

Thus, in the compressor of this embodiment, an introduction passage communicating from the oil recovery chamber 50 to the back pressure chamber 61 is formed.
The introduction passage is a passage for adjusting the back pressure using the discharge pressure, and is a minute space between the partition side through hole 55, the fixed side through hole 57, and the front fixed wall 26b and the movable substrate 36 in the fixed substrate 26. It is comprised from the clearance gap (clearance) and the movable side through-hole 60. FIG.

By the way, it has already been mentioned that the tip of the outer peripheral wall 37 of the movable scroll body 35 is in sliding contact with the flange portion 16 of the shaft support member 14 and the annular annular seal member 34 is attached to the tip of the outer peripheral wall 37.
The annular seal member 34 is mounted in a mounting groove 37 a carved on the distal end surface of the outer peripheral wall 37.
The annular seal member 34 of this embodiment is formed of an elastic rubber-based material. As shown in FIG. 3, the annular seal member 34 is equally spaced along the circumference of the annular seal member 34 (the circumferential length of the annular seal member 34 is 1). / 4) (interval divided by / 4), and four grooves 34a, 34b, 34c, 34d.
Incidentally, the condition for setting this groove portion is that the number of groove portions is two or more and the groove portions furthest away from each other (in FIG. 3, for example, the groove portion furthest away from the groove portion 34a is 34c, The most distant groove portion is 34d), the shortest circumferential distance between the groove portions on the circumference of the annular seal member 34 is set to one third or more of the circumferential length of the annular seal member 34, and the longest circumference The upper distance only needs to be set within two-thirds of the circumferential length of the annular seal member 34.
The groove portions 34 a, 34 b, 34 c, 34 d are narrow grooves that traverse in the radial direction, and these narrow grooves communicate the back pressure chamber 61 and the suction chamber 43.
The depth of the grooves 34 a, 34 b, 34 c, 34 d is set to a depth corresponding to the gap set between the front fixed wall 26 b of the fixed substrate 26 and the movable substrate 36.
The groove widths of the groove portions 34 a, 34 b, 34 c, 34 d are set so as to maintain the function of the throttle in the relationship between the back pressure chamber 61 and the suction chamber 43.

When the seal member 34 configured in this manner is mounted on the movable scroll body 35, any one of the grooves 34a to 34d faces the upper and lower portions of the back pressure chamber 61 and the suction chamber 43.
That is, there are a narrow groove that communicates between the back pressure chamber 61 and the upper portion of the suction chamber 43 and a narrow groove that communicates near the lower portion of both chambers.
Even when the atmospheres of the back pressure chamber 61 and the suction chamber 43 are not uniform, for example, in the case shown in FIG. 3, liquid clogging hardly occurs due to the presence of the groove portions 34 a and 34 c located at the upper and lower portions. The back pressure is adjusted via the upper groove portion 34a and the groove portions 34b and 34d existing in the intermediate portion, and the possibility that the intended back pressure is not set in the back pressure chamber 61 is reduced.
In addition, the movable scroll body 35 to which the annular seal member 34 is attached turns while being in sliding contact with the shaft support member 14, and the annular seal member 34 is provided with four groove portions 34 a to 34 d at equal intervals, so that the annular seal member is provided. Even when 34 moves along the mounting groove 37a, at least one of the groove portions 34a to 34d communicating with the vicinity of the upper portion of the back pressure chamber 61 and the suction chamber 43 and at least one of the groove portions 34a to 34d communicating with the vicinity of the lower portion of both chambers. There is one.

In addition, as shown in FIG. 4, the upper part of the back pressure chamber 61 and the suction chamber 43 in this embodiment is about 4 downward from the top of the compressor 10 in the height direction of the horizontally placed compressor 10. The lower part means an area of about a quarter upward from the bottom of the compressor 10.
The upper portions of the back pressure chamber 61 and the suction chamber 43 are regions in which the refrigerant is in a gas state and the grooves 34a to 34d of the annular seal member 34 are unlikely to be clogged.
In the lower part of the back pressure chamber 61 and the suction chamber 43, there is a high possibility that the refrigerant exists as mist or liquid, lubricating oil is likely to accumulate, and the grooves 34 a to 34 d of the annular seal member 34 are liable to cause clogging or the like. It is.

Next, the operation of the compressor 10 will be described.
When electric power is supplied to the electric motor in the compressor 10, the rotor 22 and the rotating shaft 17 are integrally rotated.
With the rotation of the rotating shaft 17, the movable scroll body 35 turns while avoiding rotation and sucks and compresses the refrigerant into the compression chamber 41.
In the suction stroke, the low-pressure refrigerant is introduced from the external refrigerant circuit into the suction chamber 43 through the suction port 45, the motor chamber 20, and the suction passage 44.
In the compression stroke, the refrigerant is compressed by reducing the volume in the compression chamber 41, and the compressed high-pressure refrigerant opens the check valve 46, and discharge holes 26a, discharge chambers 48, oil separation chambers 49, oil separators. 53 to the external refrigerant circuit.
In the oil separator 53, the lubricating oil in the refrigerant is separated and recovered in the oil recovery chamber 50.

The oil recovery chamber 50 is a part of the discharge pressure region, and the refrigerant in the oil recovery chamber 50 is introduced into the back pressure chamber 61 through the introduction passage.
The refrigerant in the back pressure chamber 61 is led out to the suction chamber 43 through the groove portion of the annular seal member 34.
The pressure in the back pressure chamber 61 is determined by the balance between the amount of refrigerant introduced from the oil recovery chamber 50 through the introduction passage and the amount of refrigerant led out through the grooves 34 a to 34 d of the annular seal member 34.

The movable scroll body 35 receives a biasing force in the thrust direction that is pressed against the fixed scroll body 25 according to the back pressure of the back pressure chamber 61, and is pressed against the shaft support member 14 according to the refrigerant pressure in the compression chamber 41. Receive thrust force in the thrust direction.
The urging force (back pressure) due to the back pressure and the urging force (compression force) due to the refrigerant pressure are forces acting in opposite directions.
For this reason, the relative position in the axial direction of the movable scroll body 35 with respect to the fixed scroll body 25 is determined according to the balance between the back pressure and the positive pressure.

For example, when the pressure in the compression chamber 41 decreases and the compressive force falls below the back pressure, the movable scroll body 35 is displaced by the back pressure in a direction in which the movable substrate 36 is separated from the shaft support member 14.
When the movable scroll body 35 is separated from the shaft support member 14, the gap between the front fixed wall 26b and the movable board 36 in the fixed board 26 is minimized (no gap).
As shown in FIG. 5A, when the gap between the front fixed wall 26b and the movable substrate 36 is minimized, the passage of the refrigerant with the discharge pressure is prevented in the gap constituting a part of the introduction passage.
Thereby, the refrigerant having the discharge pressure is not introduced into the back pressure chamber 61.
On the contrary, a gap is obtained between the outer peripheral wall 37 of the movable substrate 36 and the shaft support member 14 by moving the movable substrate 36 away from the shaft support member 14.
This gap is a gap generated by minimizing the gap between the fixed substrate 26 and the movable substrate 36 before the movable substrate 36 is displaced.

Since the annular seal member 34 is provided between the outer peripheral wall 37 of the movable substrate 36 and the shaft support member 14, the back pressure chamber 61 and the suction chamber 43 communicate with each other only in the grooves 34 a to 34 d even if a gap is generated. It becomes a state.
Since the pressure in the suction chamber 43 is lower than that in the back pressure chamber 61, the refrigerant in the back pressure chamber 61 escapes to the suction chamber 43 while being throttled by the grooves 34a to 34d.
For this reason, a back pressure falls and the back pressure which pushes the movable scroll body 35 to the fixed scroll body 25 also falls.
At this time, when the atmospheres of the upper and lower portions of the back pressure chamber 61 and the suction chamber 43 are not uniform, for example, the upper atmosphere may be a gas and the lower atmosphere may be a liquid.
In this case, even if any of the grooves 34a to 34d located in the lower part does not function as a throttle due to clogging with the refrigerant liquid, etc., any of the grooves 34a to 34d located in the upper part fulfills the throttle function. The pressure in the pressure chamber 61 is adjusted.

On the other hand, when the pressure in the compression chamber 41 rises and the compression force exceeds the back pressure, the movable scroll body 35 is displaced in a direction in which the movable substrate 36 is separated from the fixed substrate 26 by the action of the compression force.
As a result, as shown in FIG. 5B, the outer peripheral wall 37 of the movable substrate 36 and the shaft support member 14 are in contact with each other without a gap, and the refrigerant is interposed between the outer peripheral wall 37 of the movable substrate 36 and the shaft support member 14. It becomes impossible to pass.

On the other hand, a gap is generated between the front surface of the movable scroll body 35 and the front fixed wall 26 b of the fixed scroll body 25.
The space defined by the tip seals 58 and 59 when a gap is generated between the front surfaces of the scroll bodies 25 and 35 is a part of the introduction passage, and the refrigerant of the discharge pressure is introduced into the back pressure chamber 61 through the introduction passage. The
As a result, the pressure in the back pressure chamber 61 increases and the back pressure that presses the movable scroll body 35 against the fixed scroll body 25 increases.
As the back pressure increases, the contact pressure between the outer peripheral wall 37 of the movable substrate 36 and the shaft support member 14 is reduced, and the frictional force on the back side of the movable substrate 36 is reduced.
The power loss can be reduced by reducing the frictional force, and the reduction of the power loss contributes to the improvement of the performance of the compressor 10.

Further, the increase in the back pressure improves the degree of adhesion of the movable scroll body 35 to the fixed scroll body 25.
By improving the degree of adhesion between the movable scroll body 35 and the fixed scroll body 25, refrigerant leakage from the compression chamber 41 is prevented.
Prevention of refrigerant leakage improves the compression efficiency, and the improvement of the compression efficiency contributes to the improvement of the performance of the compressor 10.

As described above, the movable scroll body 35 is arranged so that the back pressure based on the pressure in the back pressure chamber 61 has a suitable magnitude corresponding to the compressive force based on the pressure in the compression chamber 41 and the axis of the movable substrate 36. The pressure in the back pressure chamber 61 is controlled by changing the gap with the support member 14.
By controlling the pressure in the back pressure chamber 61, it is possible to reduce the sliding resistance accompanying the turning motion of the movable scroll body 35 and to improve the compression efficiency by improving the sealing degree of the compression chamber 41.

The compressor 10 according to this embodiment has the following effects.
(1) While the annular seal member 34 blocks the back pressure chamber 61 and the suction chamber 43, the back pressure chamber 61 and the suction chamber 43 are communicated with each other by a plurality of grooves 34a to 34d provided in the annular seal member. The grooves 34a to 34d have a throttling function, and adjust the back pressure of the back pressure chamber 61 according to the discharge pressure by flowing the medium of the back pressure chamber into the suction chamber having a pressure lower than that of the back pressure region. Since the annular seal member 34 is provided with a plurality of grooves 34a to 34d, any of the grooves 34a to 34d is appropriately used as a throttle even when the atmosphere in the back pressure chamber 61 and the suction chamber 43 is not uniform. Function. For example, when the atmosphere of the back pressure chamber 61 and the suction chamber 43 is liquid at the lower portion and gas at the upper portion, even if any of the groove portions 34a to 34d corresponding to the lower portion is clogged with liquid or the like, the upper groove portion 34a corresponding to the gas. The back pressure of the back pressure chamber 61 is appropriately controlled by any one of the throttling to 34d.

(2) Since the lubricating oil separated by the oil separator 53 is stored in the discharge pressure region, the atmosphere in the back pressure chamber 61 and the suction chamber 43 is less likely to be uniform. The effect of reducing the fact that the back pressure is not set becomes more prominent.
(3) There is a convenience that the back pressure of the back pressure chamber 61 can be controlled only by using the annular seal member 34. Further, the annular seal member 34 only needs to be provided with grooves 34a to 34d, and the structure of the annular seal member 34 is simple and easy to manufacture.

(Second Embodiment)
Next, a compressor according to a second embodiment will be described with reference to FIG.
The compressor of this embodiment is a horizontal scroll compressor similar to the first embodiment.
The compressor of this embodiment is a compressor in which a back pressure chamber is set only between the movable scroll body and the shaft support member.
FIG. 6 is an enlarged longitudinal sectional view showing a main part of the compressor according to the second embodiment.

Since the basic structure of the compressor 70 of this embodiment is the same as that of the first embodiment, the description of the configuration common to the compressor 70 uses the description of the first embodiment.
As shown in FIG. 6, the bottomed cylindrical first housing body 72 is joined to the lid-shaped second housing body 73.
A space portion in the first housing body 72 is partitioned by a shaft support member 74, and a space portion on the bottom side of the first housing body 72 is a motor chamber 75.

A fixed scroll body 76 is accommodated and fixed in the vicinity of the opening side end of the first housing body 72, and the fixed scroll body 76 has a fixed substrate 77 and a fixed spiral wall 78 erected on the front surface of the fixed substrate 77. And an outer peripheral wall 79 erected in the vicinity of the outermost periphery in front of the fixed substrate 77.
A discharge chamber 80 serving as a discharge pressure region is formed in the space in the second housing body 73 on the back side of the fixed substrate 77.
A movable scroll body 81 is disposed between the fixed scroll body 76 and the shaft support member 74.
Incidentally, the shaft support member 74 corresponds to a back side sliding contact body with respect to the movable scroll body 81.

The movable scroll body 81 is rotatably supported on an eccentric shaft (not shown) of a rotating shaft (not shown).
The movable scroll body 81 has a movable substrate 82 and a movable spiral wall 83 erected on the front surface of the movable substrate 82.
A compression chamber 85 is formed by the engagement of the movable scroll body 81 and the fixed scroll body 76.
A suction chamber 86 serving as a suction pressure region is formed between the outer peripheral wall 79 of the fixed substrate 77 and the outer peripheral surface of the movable substrate 82.
The suction chamber 86 is connected to an external refrigerant circuit through a suction port 96 that penetrates both the outer peripheral wall 79 and the first housing body 72.

  The tip of the movable spiral wall 83 is in sliding contact with the front surface of the fixed substrate 77, and a tip seal 87 is attached to the tip of the movable spiral wall 83. Is installed.

In the front surface of the movable substrate 82, the vicinity of the outer periphery which is the radially outer side of the compression chamber 85 is in sliding contact with the front wall 77 a on the front surface of the fixed substrate 77.
A recess 77b is formed in the front wall 77a of the fixed substrate 77, and two chip seals 89 are mounted on the inner diameter side and the outer front wall 77a of the recess 77b.

On the back surface of the movable substrate 82, the vicinity of the outer periphery which is the inner side in the radial direction of the suction chamber 86 is in sliding contact with the shaft support member 74.
An annular recess 82a is formed on the back surface of the movable substrate 82 that is in sliding contact with the shaft support member 74, and the recess 82a constitutes a back pressure chamber.
The inner diameter side and the outer diameter side of the back pressure chamber formed by the recess 82 a are in sliding contact with the back surface of the movable substrate 82 and the shaft support member 74, respectively, but the outer diameter side annular seal member 90 is disposed on the outer diameter side of the recess 82 a in the movable substrate 82. Is installed.

The outer diameter side annular seal member 90 has a plurality of groove portions 90a formed of narrow grooves that communicate the recess 82a, which is a back pressure chamber, and the suction chamber 86 (for convenience of explanation, the individual groove portions are not distinguished in this embodiment). .
Further, an inner diameter side annular seal member 91 is mounted on the inner diameter side of the shaft support member 74 corresponding to the recess 82a.
The inner diameter side annular seal member 91 corresponds to a second annular seal member with respect to the outer diameter side annular seal member 90, and a plurality of groove portions 91a formed of narrow grooves (for convenience of explanation, individual groove portions are not distinguished in this embodiment. ), And the inner diameter side annular seal member 91 enables the recess 82a and the motor chamber 75 to communicate with each other by a groove portion 91a as a second groove portion.
Both annular seal members 90 and 91 have the same configuration as the annular seal member 34 of the first embodiment except that there is a difference in diameter.

By the way, the fixed substrate 77 has a fixed-side through hole 92 that allows the discharge chamber 80 and the recess 77b to communicate with each other.
The opening on the discharge chamber 80 side of the fixed side through hole 92 is covered with a filter 94.
The movable substrate 82 in the movable scroll body 81 has a movable side through-hole 95 communicating with the concave portion 77 b of the fixed substrate 77 and the concave portion 82 a of the movable substrate 82.
In other words, a refrigerant introduction passage that communicates from the discharge chamber 80 to the recess 82 a is formed. In other words, the introduction passage includes the fixed side through hole 92 and the recess 77 b of the fixed substrate 77 and the movable side passage of the movable substrate 82. It is constituted by the hole 95.

When the compressor 70 of this embodiment is operated, the movable scroll body 81 turns while avoiding rotation and sucks and compresses the refrigerant into the compression chamber 85.
The movable scroll body 81 receives an urging force (back pressure) in the thrust direction pressed against the fixed scroll body 76 according to the back pressure of the back pressure chamber, and also supports the shaft support member according to the refrigerant pressure in the compression chamber 85. The thrust force (compression force) in the thrust direction that is pressed against 74 is received.

For example, when the pressure in the compression chamber 85 decreases and the compression force falls below the back pressure, the movable scroll body 81 is displaced by the back pressure in a direction in which the movable substrate 82 is separated from the shaft support member 74.
When the movable scroll body 81 moves away from the shaft support member 74, the gap between the fixed substrate 77 and the movable substrate 82 is minimized (no gap).
When the gap between the fixed substrate 77 and the movable substrate 82 is minimized, passage of the discharge pressure refrigerant in the introduction passage is hindered, and the discharge pressure refrigerant is not introduced into the recess 82a, which is the back pressure chamber.
On the other hand, a gap corresponding to the gap between the fixed substrate 77 and the movable substrate 82 before the displacement of the movable substrate 82 is obtained between the movable substrate 82 and the shaft support member 74.

Since the outer diameter side annular seal member 90 is provided on the outer diameter side of the concave portion 82 a between the movable substrate 82 and the shaft support member 74, only the narrow groove 90 a has only the concave portion 82 a and the suction chamber 86 even if a gap occurs. It will be in the state which communicates.
On the inner diameter side, the groove portion 91 a of the inner diameter side annular seal member 91 communicates the space 82 communicating with the motor chamber 75 and the recess 82 a.
Since the pressure in the suction chamber 86 and the motor chamber 75 is lower than that in the recess 82a, the refrigerant in the recess 82a is released through the grooves 90a and 91a while being throttled, and the back pressure is lowered to move the movable scroll body 81 to the fixed scroll body. The back pressure applied to 76 also decreases.
At this time, when the atmosphere in the upper portion of the recess 82a is gas and the atmosphere in the lower portion is liquid, the groove portions 90a and 91a located in the lower portions of the annular seal members 90 and 91 are clogged with liquid. Even if not done, the grooves 90a and 91a located at the upper part adjust the pressure of the back pressure chamber while performing the throttling function.

On the other hand, when the pressure in the compression chamber 85 rises and the positive pressure exceeds the back pressure, the movable scroll body 81 is displaced in the direction of separating the movable substrate 82 from the fixed substrate 77 by the positive pressure.
As a result, the movable substrate 82 and the shaft support member 74 are in contact with each other without a gap, and the refrigerant cannot pass between the outer peripheral wall of the movable substrate 82 and the shaft support member 74.
On the other hand, a gap is generated between the front surface of the movable scroll body 81 and the front surface of the fixed scroll body 76.
In the recess 77b between the front surfaces of the scroll bodies 76 and 81, the gap defined by the tip seal 89 is a part of the introduction passage, and the refrigerant having the discharge pressure is introduced into the recess 82a through the introduction passage.
Thereby, the pressure of the recessed part 82a rises and the back pressure which presses the movable scroll body 76 against the fixed scroll body 81 rises.

As the concave portion 82a rises, the contact pressure between the outer peripheral wall of the movable substrate 82 and the shaft support member 74 is reduced, and the frictional force on the back side of the movable substrate 82 is reduced.
Further, the back pressure increases, so that the degree of adhesion of the movable scroll body 81 with respect to the fixed scroll body 76 is improved, and refrigerant leakage from the compression chamber 85 is prevented.

According to the compressor of this embodiment, there exists an operation effect (1) which a compressor of a 1st embodiment has.
Furthermore, in this case, the recess 82a as the back pressure region is formed by the outer diameter annular seal member 90 and the inner diameter annular seal member 91, and the groove portions 90a, 91a are provided in the respective seal members 90, 91. The possibility that the intended back pressure is not set in the region can be more reliably reduced.

(Another example of annular seal member)
Next, another example of the annular seal member will be described.
In the first embodiment, the four grooves 34 a, 34 b, 34 c, 34 d are provided so that the narrow grooves, which are the grooves of the annular seal member 34, are equally spaced on the circumference of the seal member 40.
An annular seal member 101 shown in FIG. 7A is an example in which groove portions 101a, 101b, and 101c, which are narrow grooves, are provided.
The three groove portions 101 a to 101 c are arranged at equal intervals on the circumference of the annular seal member 101.
The circumferential distance between the adjacent groove portions 101 a to 101 c is one third of the circumferential length of the annular seal member 101.
According to the arrangement of the three groove portions 101a to 101c, for example, when one groove portion 101a faces the upper portion of the back pressure chamber and the suction chamber, the remaining two groove portions 101b and 101c face the lower portions of both chambers. It will be.
In this case, the presence of the groove portion 101a in the upper portion of the back pressure chamber and the suction chamber and the groove portions 101b and 101c in the lower portion reduce the adverse effect of the back pressure control due to the non-uniform atmosphere in the back pressure chamber and the suction chamber. be able to.

FIG. 7B is an example of the annular seal member 102 provided with five groove portions 102a, 102b, 102c, 102d, and 102e as groove portions. In particular, the distance between the groove portions 102a to 102e is not evenly spaced. Absent.
However, for example, the shortest circumferential distance with respect to the groove 102d farthest from the arbitrary groove 102a is set to one third or more of the circumferential length of the annular seal member 102, and the longest distance between the grooves 102a and 102d. Another groove 102e is disposed on the circumference.
For this reason, according to arrangement | positioning of the groove parts 102a-102e of this example, any one of the groove parts 102a-102e exists in the upper part and the lower part of a back pressure chamber and a suction chamber.

FIG. 7C shows an example of the annular seal member 103 provided with two groove portions 103a and 103b as groove portions. The shortest distance between the groove portions 103a and 103b on the circumference and the longest distance are both circular. It is set to 1/3 or more of the circumference.
For this reason, when one groove part 103a faces the lower part of a back pressure chamber and a suction chamber, the other groove part 103b will be located in the upper part.
In addition, the case where both the groove parts 103a and 103b are located in the substantially same height, ie, the height near the center of a compressor, can be considered.
However, since at least the narrow grooves 103a and 103b do not exist in the lower part, there is almost no possibility of liquid or mist clogging the narrow grooves 103a, and the back pressure control due to the non-uniform atmosphere in the back pressure chamber and the suction chamber. Very unlikely to be adversely affected.

As shown in FIGS. 7A to 7C, the groove portions 101a to 101c, 102a to 102e, 103a, and 103b, which are the groove portions in the annular seal members 101 to 103, are plural and from any groove portion. The shortest distance on the circumference with the furthest groove part and the longest distance only have to be set to one third or more of the circumferential length.
Further, preferably, three or more groove portions are provided so that the shortest distance on the circumference with the groove portion furthest away from any groove portion is at least one third of the circumferential length, and the longest distance between the groove portions. What is necessary is just to make it provide another groove part on the circumference where is set.

(Another example of groove)
Next, another example of the groove portion of the annular seal member will be described.
In the first embodiment, the single narrow groove in the annular seal member 34 substantially constitutes the groove portions 34a to 34d.
The groove portion shown in FIG. 8 is an example of the annular seal member 105 in which three narrow grooves 105a cut in the radial direction are arranged in parallel to each other.
By forming the groove contact surface 105b that contacts the shaft support member between the narrow grooves 105a, the rigidity in the vicinity of the narrow groove 105a is maintained, and deformation of the groove portion can be prevented.
In addition, the cross-sectional form of a groove part will not be specifically limited if it is a cross section which can function as a groove | channel not only a square groove | channel but arc grooves, an inverted triangular groove, etc.

The present invention is not limited to the first and second embodiments and modifications described above, and various modifications are possible within the scope of the invention as follows, for example.
In the first and second embodiments described above, the four groove portions of the annular seal member are arranged at equal intervals on the circumference of the annular seal member. For example, FIG. 7 (a) to FIG. You may employ | adopt the cyclic | annular sealing member of (c).
In the second embodiment, the inner diameter side annular seal member is used, but a chip seal without a groove may be used. In this case, the back pressure is controlled by the groove portion of the outer diameter side sealing member that communicates the suction chamber and the back pressure chamber.
Further, the configuration of the groove portion of the inner diameter side annular seal member and the configuration of the outer diameter side annular seal member may be different from each other. For example, the number of groove portions and the number of fine grooves constituting the groove portion may be different.
○ In the first embodiment, the shaft seal member separating the back pressure chamber and the motor chamber is provided and the motor chamber is used as the suction pressure region. However, the motor chamber is used as the back pressure region without providing the shaft seal member. May be. In this case, it is necessary to provide a suction passage without connecting the suction port to the motor chamber.
In the first embodiment, an oil separator is provided to separate and collect the lubricating oil in the refrigerant, and the collected lubricating oil is passed only through the introduction passage, and the groove of the annular seal member is passed through the lubricating oil. However, you may provide the channel | path which lets lubricating oil different from an introduction channel | path. Thereby, liquid clogging in the groove portion of the annular seal member can be made difficult to occur.

It is a longitudinal cross-sectional view of the horizontal type scroll compressor which concerns on 1st Embodiment. It is an expanded vertical sectional view which shows the principal part of a horizontal installation type scroll compressor. It is a perspective view which shows an annular seal member. 4 is a view taken along the line AA in FIG. It is an expanded vertical sectional view explaining an effect | action of a horizontal installation type scroll compressor. It is an expanded vertical sectional view which shows the principal part of the horizontal type scroll compressor which concerns on 1st Embodiment. It is a front view of the cyclic | annular seal member which shows another example of arrangement | positioning of the groove part in a cyclic | annular seal member. It is a principal part perspective view of the cyclic | annular sealing member which shows another example of a groove part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10, 70 Horizontal type scroll compressor 14 Axis support member 25, 76 Fixed scroll body 26, 77 Fixed substrate 26b Front fixed wall 27, 79 Outer peripheral wall 28, 78 Fixed spiral wall 34, 101-103 Annular seal members 34a, 34b , 34c, 34d, 90a, 91a, 101a, 101b, 101c, 102a, 102b, 102c, 102d, 102e, 103a, 103b Groove 35, 81 Movable scroll body 36, 82 Movable substrate 37 Outer peripheral wall 37a Mounting groove 38, 83 Movable Swirl wall 41 Compression chamber 43, 86 Suction chamber 48, 80 Discharge chamber 50 Oil recovery chamber 53 Oil separator 55 Partition side through hole 57 Fixed side through hole 60 Movable side through hole 61 Back pressure chamber 82a Recess 90 Outer annular seal member 91 Inner ring seal member P, Q

Claims (4)

A fixed scroll body having a fixed substrate fixed in the housing and a fixed spiral wall standing upright in front of the fixed substrate, and a movable scroll in which a movable spiral wall meshing with the fixed spiral wall is set up in front of the movable substrate And a back side sliding contact body that has a compression chamber defined between the fixed spiral wall and the movable spiral wall and that is in sliding contact with the rear surface of the movable substrate, and a back pressure region is provided on the rear surface of the movable substrate. The back pressure region and the discharge pressure region are communicated with each other via an introduction passage, and a suction pressure region is defined separately from the back pressure region, and the volume of the compression chamber is reduced due to the orbiting motion of the movable scroll body and Horizontal scroll compression that compresses compressible fluid by movement and adjusts the pressure in the back pressure region by displacement of the movable scroll body in the contact / separation direction between the fixed substrate and the back side sliding contact body. In,
An annular seal member that interrupts the back pressure region and the suction pressure region is interposed between the movable substrate and the back side sliding contact body,
The annular seal member is mounted in a mounting groove carved in the movable scroll body, and has a plurality of groove portions,
The groove is a narrow groove formed in the radial direction on the end surface of the annular seal member, and the movable scroll body is displaced in a direction away from the back side sliding contact body, and the movable substrate and the back side sliding contact body are When a gap is obtained between the back pressure region and the suction pressure region,
For the groove portions that are farthest from each other, the shortest circumferential distance between the groove portions on the circumference of the annular seal member is set to one third or more of the circumferential length of the annular seal member,
The introduction passage has a minute gap set between the fixed substrate and the movable substrate, and the movable scroll body is displaced in a direction to separate the movable substrate from the fixed substrate. A horizontal scroll compressor characterized in that the back pressure region and the discharge pressure region communicate with each other when a gap is generated between them .   2. The horizontal scroll compressor according to claim 1, wherein the groove portion is composed of a plurality of narrow grooves arranged at minute intervals.   A second annular seal member having a diameter smaller than that of the annular seal member is interposed between the movable substrate and the back side sliding contact body, and the second annular seal member includes the back pressure region and the suction pressure region. The horizontal scroll compressor according to claim 1, further comprising a plurality of second groove portions communicating with each other.   The horizontal scroll compression according to any one of claims 1 to 3, wherein an oil separator is provided in the discharge pressure region, and the introduction passage allows passage of oil collected in the oil separator. Machine.

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