TW201816269A - Rotary scroll type compressor wherein both the sealability and compression ratio can be improved, and the structural design can be optimized by changing the geometrical profile and rotation mode of the first scroll sheet and the second scroll sheet - Google Patents

Abstract

A rotary scroll type compressor includes a first scroll unit and a second scroll unit. The first scroll unit can be driven to rotate about a first centerline and includes a first scroll sheet, and two opposite sides of the first scroll sheet have a plurality of angularly spaced first convex teeth. The second scroll unit is rotatable about a second centerline parallel to the first centerline and includes a second scroll sheet inserted opposite to the first scroll sheet. Two opposite sides of the second scroll sheet have a plurality of angularly spaced second convex teeth. When driving, a partial portion of the first convex teeth is in close contact and engagement with the corresponding second convex teeth, so that the first scroll sheet can drive the second scroll sheet to rotate synchronously in the same direction with a tangential force. Therefore, by changing the geometrical profile and rotation mode of the first scroll sheet and the second scroll sheet, the sealability and the compression ratio can be improved, and the structural design can be optimized.

Description

Transformer scroll compressor

The invention relates to a compressor, in particular to a rotary scroll compressor.

Scroll Type Compressor has the advantages of high reliability, low vibration, low noise, and energy saving, so it is widely used in refrigeration, heat pump, vacuum pump, and air compressor. It can be generally divided into two types: male and female. The male scroll compressor mainly includes a fixed scroll, an orbiting scroll, an anti-rotation mechanism, and an eccentric drive shaft. It also has the disadvantages of being difficult to assemble and expensive due to the precision of the parts. In this rotary scroll compressor, two scroll blades are respectively installed on two relatively spaced-apart rotating shafts, one of which is directly driven by a motor, and the other scroll blade is indirectly via a synchronization The mechanism is driven to rotate, but its structure is complicated, the mechanical wear rate is high, and the phase difference generated by the synchronization mechanism will cause tangential leakage between the scrolls, which often results in poor compression efficiency. If you want to To increase the compression ratio, only the size of the scroll blade can be increased. However, this is not conducive to miniaturization of the mechanism and cost considerations. Therefore, the above existing scroll compressor has room for improvement and is necessary.

It is therefore an object of the present invention to provide a rotary scroll compressor capable of overcoming at least one of the disadvantages of the prior art.

Therefore, the rotary scroll compressor of the present invention includes a first scroll unit and a second scroll unit.

The first scroll unit can be driven to rotate around a first center line, and includes a first scroll plate having a vortex shape. The first scroll plate has two first sides opposite to each other inside and outside. The first side surface has a plurality of first convex tooth portions which are angularly spaced and connected adjacently in a continuous wave.

The second scroll unit is eccentrically disposed relative to the first scroll unit, and can be driven by the first scroll unit to rotate synchronously in the same direction around a second centerline parallel to the first centerline. The second scroll unit includes a second scroll plate that is vortex-shaped and is inserted opposite to the first scroll plate. The second scroll plate has two second sides opposite to each other inside and outside. The side surface has a plurality of second convex tooth portions which are angularly spaced and connected adjacently in a continuous wave.

The first scroll piece and the second scroll piece rotate through a plurality of spaced-apart sealing areas, and each of a plurality of the first convex tooth portions of each seal area and a plurality of adjacent second convex teeth are respectively passed through. The corresponding parts are tightly engaged, so that the first scroll piece can drive the second scroll piece to rotate in the same direction with a tangential force; the first scroll piece and the second scroll piece cooperate to define two The spiral inlets located at the periphery, a spiral outlet at the center, and a plurality of compression spaces spaced apart from each other and located between the spiral inlets and the spiral outlets are sequentially spaced from the outside to the inside.

1, 2 and 3, an embodiment of a rotary scroll compressor according to the present invention includes a casing unit 1, a driving unit 2, a first scroll unit 3, and a second scroll unit. 4, and a shaft seat unit 5.

The casing unit 1 includes a hollow first casing 11, a hollow second casing 12 connected to one side of the first casing 11, and a hollow casing connected to the first casing 11 away from the first casing 11. An input housing 13 on one side of the two housings 12, a first bearing 14 installed in the center of the input housing 13, and a hollow and connected to the second housing 12 away from one side of the first housing 11的 应用 壳 15。 The output housing 15.

The first casing 11 has a first surrounding wall 111 having a circular ring shape, and an inner protruding wall 112 protruding radially inward from the first surrounding wall 111. The first surrounding wall 111 has a plurality of first flow guiding surfaces 113 adjacent to each other and surroundingly formed on an inner wall surface adjacent to the second casing 12. The inner protruding wall 112 has a turbine cover surface 114 facing the first guide surfaces 113. The turbine cover surface 114 gradually bends from the outside to the direction of the first bearing 14.

The second casing 12 has a second surrounding wall 121 having a circular shape. The second surrounding wall 121 has a plurality of second guiding surfaces 122 adjacent to each other and surroundingly formed on an inner wall surface adjacent to the first casing 11. The second guiding surfaces 122 respectively correspond to the first guiding surfaces. Stream surface 113.

The input housing 13 has a third surrounding wall 131 having a circular ring shape, a shaft seat 132 which is hollow and located at the center of the third surrounding wall 131, and a shaft body 132 and the third surrounding wall 131 which are connected in the same body.的 连接 墙 133。 The connecting wall 133. The third surrounding wall 131, the shaft seat 132 and the connection wall 133 cooperate to define an accommodation space 134 adjacent to the second housing 12, and a penetration space 134 passing through the third surrounding wall 131 and defined by the accommodation space 134. An input port 135 communicating outward for the working fluid to enter. The shaft seat 132 is used for the first bearing 14 to be embedded therein. The output casing 15 has an eccentrically disposed bearing space 151.

The driving unit 2 includes a motor 21 mounted on the input housing 13. The motor 21 has a driving shaft 211 passing through the first bearing 14 and protruding into the inner protruding wall 112 of the first housing 11. . The driving unit 2 further includes a shaft sleeve 22 connected to the periphery of the driving shaft 211 and protruding toward the first housing 11, and a shaft seat 132 located on the periphery of the shaft sleeve 22 and connected to the input housing 13. A bearing cover 23 and a first sealing ring 24 interposed between the shaft sleeve 22 and the bearing cover 23 to prevent the working fluid from leaking.

The first scroll unit 3 can be driven by the driving unit 2 to rotate around a first centerline 30, and includes a first scroll piece 31 installed in the second casing 12 and having a spiral shape, a A first substrate 32 formed in the same body as the first scroll sheet 31 adjacent to one side of the first casing 11 and located in the first casing 11, one along the first center line 30 and formed by the first The first shaft tube 33 which protrudes in the same direction from the center of the base plate 32 toward the direction away from the first scroll piece 31, and a plurality of pieces are angularly spaced around the first center line 30 and connected by an arc of the periphery of the first shaft tube 33 To the turbine blade 34 of the first substrate 32.

The first scroll sheet 31 has a first end surface 311 away from the first substrate 32. The first shaft tube 33 is adjacent to the shaft sleeve 22 and is used for the driving shaft 211 to be inserted and linked. The first base plate 32, the turbine blades 34 and the turbine cover surface 114 cooperate to define a plurality of angularly spaced vortex channels 35. Each vortex channel 35 spirally extends from the inside to the direction of the second casing 12. The width of the vortex channel 35 communicates with the accommodating space 134 inside.

The second scroll unit 4 is eccentrically disposed with respect to the first scroll unit 3, and can be driven by the first scroll unit 3 to rotate synchronously about a second center line 40 in the same direction. The center line 40 is parallel to the first center line 30. The second scroll unit 4 includes a second scroll piece 41 installed in the second casing 12 and having a spiral shape, and a second scroll piece 41 formed in the same body adjacent to the output casing 15. A second substrate 42 located on the side and located in the output casing 15, and a first protrusion protruding along the second center line 40 and protruding from the center of the second substrate 42 in a direction away from the second scroll 41. Two-axis tube 43. The second scroll sheet 41 and the first scroll sheet 31 have similar geometric shapes and are 180 degrees out of phase with each other, and are inserted opposite to the first scroll sheet 31.

The second scroll sheet 41 has a second end surface 411 that is far from the second substrate 42 and abuts the first substrate 32. The second substrate 42 is adjacent to the first end surface 311 of the first scroll piece 31 and has a through hole 421 located on the second center line 40. The second shaft tube 43 surrounds and communicates with the through hole 421. An outer peripheral surface of the second scroll unit 4, an outer peripheral surface of the first scroll unit 3, the first diversion surfaces 113 and the second diversion surfaces 122 cooperate to define a communication with the The guide channel 61 on the outer side of the vortex channel 35.

The bearing block unit 5 includes a bearing block 51 installed in the bearing space 151 of the output housing 15 and supporting the second base plate 42 and surrounding the periphery of the second shaft tube 43. A bearing block 51 is installed in the bearing block 51. A second bearing 52 between the second shaft tube 43 and a shaft seat cover 53 connected to the bearing housing 51 away from the second base plate 42 and protruding into the second shaft tube 43 is provided. A second seal ring 54 between the second shaft tube 43 and the shaft seat cover 53 to prevent the working fluid from leaking. The shaft seat cover 53 has an output port 531 communicating with the through hole 421 and discharging the working fluid. The shaft seat unit 5 further includes a check valve 56 installed in the shaft seat cover 53 and correspondingly located between the perforation 421 and the output port 531, so that the working fluid can flow into the output port 531 through the perforation 421. Flowing back from the output port 531 to the perforation 421 can be used to prevent the discharged working fluid from flowing backward.

The shaft seat unit 5 further includes an adjusting member 55 that is screwed radially between the output housing 15 and the bearing seat 51. By rotating the adjusting member 55, the bearing seat 51 and the second scroll unit can be driven 4 moves relative to the output casing 15 together to adjust the radial meshing degree between the second scroll piece 41 and the first scroll piece 31.

Referring to FIG. 1, FIG. 3, and FIG. 4, the relative structures of the first scroll sheet 31 and the second scroll sheet 41 are further examined. The first scroll sheet 31 and the second scroll sheet 41 cooperate to define There are two spiral inlets 62 spaced apart from each other at the periphery, a central outlet 63 and a plurality of compression spaces 64 spaced apart from each other and located between the spiral inlets 62 and the outlet 63. The rotary inlets 62 communicate with the flow guide 61, and the rotary outlets 63 communicate with the perforations 421 of the second substrate 42. The compression spaces 64 spiral around the rotary outlets 63 and shrink in sequence from the outside to the inside.

In addition, the first scroll sheet 31 also has two first side surfaces 312 opposite to each other inside and outside, and each of the first side surfaces 312 has a plurality of first convex tooth portions 313 that are spaced apart at an angle and are adjacently connected to form a continuous wave. The second scroll piece 41 also has two second side surfaces 412 opposite to each other inside and outside, and each second side surface 412 has a plurality of second convex tooth portions 413 that are spaced apart at an angle and connected adjacently to form a continuous wave. The second convex tooth portions 413 correspond to the first convex tooth portions 313. The first side surface 312 of the first scroll sheet 31 on the inner side and the second side surface 412 of the second scroll sheet 41 on the outer side are meshed and sealed with each other. The first side surface 312 of the first scroll sheet 31 on the outer side and the first The second side surface 412 on the inner side of the two scroll pieces 41 meshes and seals with each other, and the first side surface 312 of the first scroll piece 31 and the second side surface 412 of the second scroll piece 41 have different curvature regions, so they are formed The compression space is 64.

In use, the first scroll unit 3 is driven to rotate by the drive shaft 211 of the motor 21, because the first end surface 311 of the first scroll sheet 31 and the second substrate 42 and the first substrate 32 A sliding friction force is generated between the second scroll surface 41 and the second end surface 411 of the second scroll plate 41. Therefore, the first scroll plate 31 can frictionally drive the second scroll plate 41 to rotate. At the same time, the first scroll plate 41 The sheet 31 and the second scroll sheet 41 will rotate through two spaced apart sealing areas 65 (separated by imaginary lines in FIG. 4), and pass through the first convex tooth portions 313 of each of the sealing areas 65. Will be in close contact with the adjacent second convex tooth portions 413 respectively, so that the first scroll piece 31 will drive the second scroll piece 41 to rotate in the same direction with a tangential force, so the The second scroll unit 4 is driven to rotate by the first scroll unit 3. It should be noted that the first convex tooth portions 313 and the second convex tooth portions 413 located between every two adjacent sealing areas 65 will be separated from each other without meshing, and a pair will be defined by cooperation. The compressed space is 64.

Therefore, when the working fluid enters the accommodating space 134 from the input port 135 of the input casing 13, the working fluid is preliminarily compressed through the vortex passages of the turbine blades 34, and then the work is performed. The fluid will be guided to the diversion channel 61, and then enter the spiral inlets 62 to start the scroll compression process.

Referring to FIG. 5, as the first scroll blade 31 and the second scroll blade 41 rotate counterclockwise, the compression spaces 64 will cyclically change position and size, and the working fluid entering the compression spaces 64 , Will also be squeezed and sequentially pass through the low compression state, medium compression state, and high compression state, and then complete the compression action. In Fig. 5, four states of 0 degrees, 90 degrees, 180 degrees, and 270 degrees are sequentially rotated. The following is explained in order: at 0 degrees, as shown in the first flowchart in the upper left corner, etc. The screw inlet 62 is opened for the working fluid to enter the two outermost compression spaces 64. When rotated 90 degrees, as shown in the second flowchart in the upper right corner, the space of the compression spaces 64 located at the outermost periphery becomes larger, and the spiral inlets 62 are about to close. Then rotate 90 degrees again, as shown in the third flowchart in the lower right corner, the rotary inlets 62 are completely closed, and the compression spaces 64 located at the outermost are closed. Finally, if you rotate it 90 degrees, as shown in the fourth flowchart in the lower left corner, the working fluid in the compression spaces 64 located at the outermost periphery will be drawn in, and the space of the compression spaces 64 will be The compression becomes smaller, and the spiral inlet 62 will gradually open at this time. According to the above process cycle, the working fluid will be gradually compressed and drawn in until it is compressed by the scroll to the spinning outlet 63, and the working fluid will pass through the perforation 421 of the second substrate 42 as shown in FIG. Is discharged from the output port 531 of the shaft seat cover 53.

As can be seen from the above description, the rotary scroll compressor of the present invention is designed to have the side surfaces 312 and 412 of the first scroll blade 31 and the second scroll blade 41 in scroll contact with each other, and is designed to have continuous The corrugated vortex-shaped surface allows the relative relationship of the phases to be maintained when the scrolls 31 and 41 are engaged, so the conventional setting of the anti-rotation mechanism can be omitted, and the first convex tooth portions 313 and the The self-adjustment between the second convex tooth portions 413 and the curvature of the meshing area between the first side surface 312 of the first scroll piece 31 and the second side surface 412 of the second scroll piece 41 are different. A gap air film is formed in the meshing area, which can form a good tangential seal, and the first convex tooth portions 313 and the second convex tooth portions 413 can produce a large-area contact meshing relationship. Knowing the linear contact relationship of the smooth arc surface of the scroll structure, in addition to the directional effect of the present invention, the sealing effect is also quite good. Therefore, the present invention can effectively improve the sealing and compression effects.

Furthermore, the first scroll unit 3 of the present invention is connected to the drive shaft 211, provides an active scroll function, and uses the cutting generated by the first convex tooth portions 313 and the second convex tooth portions 413 to engage with each other. The directional force and the sliding frictional force generated between the first end surface 311 and the second substrate 42 and between the first substrate 32 and the second end surface 411 transmit torque to the second scroll unit 4 to Drive the second scroll unit 4 to rotate in the same direction synchronously, so that the second scroll unit 4 has a driven scroll function, so the second scroll unit 4 of the present invention is directly driven by the first scroll unit 3 It is not driven by a synchronization mechanism as it is known, and because the scroll units 3 and 4 rotate around their own centerlines 30 and 40, respectively, no centrifugal force is generated, so there is no need to set a known balance mechanism, and There is no need to provide a conventional compliance mechanism such as an eccentric shaft, an eccentric sleeve, etc. Therefore, the invention has a simple structure and is easy to assemble, which can greatly reduce costs and improve market competitiveness.

To sum up, the rotary scroll compressor of the present invention only needs to change the geometrical contour and rotation mode of the first scroll blade 31 and the second scroll blade 41, so that the conventional compressors must be omitted. Anti-rotation mechanism, balance mechanism, eccentric shaft, and compliance mechanism and other complex structures. At the same time, it can effectively improve the compression ratio and optimize the structure, improve the tangential seal of the existing scroll compressor, and the precision of the parts of the anti-rotation mechanism and balance mechanism. Restrictions and shortcomings that are not easy to assemble can make the performance of scroll compressors more perfect, ideal and practical, so it can indeed achieve the purpose of cost invention.

It is worth mentioning that the first scroll unit 3 of the present invention is provided with the turbine blades 34 so that the working fluid can be subjected to preliminary compression before entering the scroll compression process, and then passed through the guide channel 61, It is then rolled into the compression spaces 64 from the outside to the inside, and passes through compression processes such as low pressure, medium pressure, and high pressure, that is, a series of power types provided by combining the turbine blades 34 and the scroll blades 31 and 41. Compression, which can greatly increase the compression ratio and optimize compression performance. In addition, the working fluid will flow through the first scroll sheet 31 and the second scroll sheet 41, and can take away the heat generated by the first scroll sheet 31 and the second scroll sheet 41 due to contact friction, With cooling effect, it can extend the service life.

However, the above are only examples of the present invention. When the scope of implementation of the present invention cannot be limited in this way, any simple equivalent changes and modifications made in accordance with the scope of the patent application and the content of the patent specification of the present invention are still Within the scope of the invention patent.

1‧‧‧chassis unit

11‧‧‧First case

111‧‧‧ the first surrounding wall

112‧‧‧ inner wall

113‧‧‧first diversion surface

114‧‧‧Turbine cover

12‧‧‧Second shell

121‧‧‧ Second surrounding wall

122‧‧‧Second diversion surface

13‧‧‧input housing

131‧‧‧ Third surrounding wall

132‧‧‧Shaft

133‧‧‧ connecting wall

134‧‧‧accommodation space

135‧‧‧input port

14‧‧‧The first bearing

15‧‧‧output housing

151‧‧‧bearing space

2‧‧‧Drive unit

21‧‧‧Motor

211‧‧‧Drive shaft

22‧‧‧ shaft sleeve

23‧‧‧bearing cap

24‧‧‧First Ring

3‧‧‧First scroll unit

30‧‧‧First Centerline

31‧‧‧First scroll

311‧‧‧first end face

312‧‧‧first side

313‧‧‧first convex tooth

32‧‧‧first substrate

33‧‧‧First shaft tube

34‧‧‧ Turbine Blade

35‧‧‧vortex channel

4‧‧‧Second scroll unit

40‧‧‧Second Center Line

41‧‧‧Second scroll

411‧‧‧Second end face

412‧‧‧ second side

413‧‧‧Second convex tooth

42‧‧‧second substrate

421‧‧‧perforation

43‧‧‧Second shaft tube

5‧‧‧ Shaft Block Unit

51‧‧‧bearing

52‧‧‧Second bearing

53‧‧‧shaft cover

531‧‧‧output

54‧‧‧Second Seal

55‧‧‧Adjustment

56‧‧‧Check valve

61‧‧‧Diversion channel

62‧‧‧Turn entrance

63‧‧‧ Rotary Exit

64‧‧‧ compressed space

65‧‧‧sealed area

Other features and effects of the present invention will be clearly presented in the embodiment with reference to the drawings, in which: FIG. 1 is an exploded perspective view of an embodiment of the rotary scroll compressor of the present invention; FIG. 2 is the Another perspective exploded view of the embodiment; FIG. 3 is an incomplete longitudinal sectional view of one of the embodiments; FIG. 4 is a transverse sectional view of one of the embodiments; and FIG. 5 is a schematic diagram of a flow of use of one of the embodiments to explain A state in which a first scroll sheet and a second scroll sheet are relatively rotated.

Claims (10)

A rotary scroll compressor includes: a first scroll unit, which can be driven to rotate around a first center line, and includes a first scroll plate having a vortex shape, and the first scroll plate It has two first sides with opposite inner and outer sides, each of which has a plurality of first convex tooth portions spaced apart at an angular interval and adjacently connected in a continuous wave; and a second scroll unit, which is opposite to the first scroll unit The first scroll unit is eccentric and can be driven by the first scroll unit to rotate synchronously in the same direction around a second center line parallel to the first center line. The second scroll unit includes a spiral and The first scroll sheet is inserted into the second scroll sheet facing each other, and the second scroll sheet has two inner and outer opposite second sides, each of which has several angular intervals and is adjacently connected to form a continuous wave. A second convex tooth portion; the first scroll piece and the second scroll piece rotate through a plurality of spaced-apart sealing areas, and pass through a plurality of the first convex tooth portions of each seal area with adjacent numbers Each of the second convex tooth portions is in close contact with each other, It is obtained that the first scroll sheet can drive the second scroll sheet to rotate synchronously in the same direction with a tangential force; the first scroll sheet and the second scroll sheet cooperate to define two spirals which are spaced apart from each other on the periphery. The inlet, a central rotary outlet, and several compression spaces spaced from each other and located between the rotary inlets and the rotary outlets, and the compression spaces are sequentially reduced from the outside to the inside. The rotary scroll compressor according to claim 1, wherein the first scroll unit further includes a first substrate formed on one side of the first scroll plate away from the second scroll unit. The second scroll unit further includes a second substrate formed on one side of the second scroll plate away from the first scroll unit, and the first scroll plate further has a distance away from the first substrate and Adjacent to the first end surface of the second substrate, the second scroll sheet also has a second end surface that is far from the second substrate and abuts the first substrate. When the first scroll unit is driven to rotate, Sliding friction will be generated between the first end surface of the first scroll sheet and the second substrate, and between the first substrate and the second end surface of the second scroll sheet, so that the first scroll sheet can Friction drives the second scroll to rotate. The rotary scroll compressor according to claim 2, wherein the first scroll unit further includes a plurality of angularly spaced intervals around the first center line, and the same is disposed on the first substrate away from the first Turbine blades on one side of the scroll. The orbiting scroll compressor according to claim 3, wherein the orbiting scroll compressor further comprises a casing unit including a first casing surrounding and covering the periphery of the turbine blades. A casing, and a second casing connected to the first casing and surrounding the periphery of the first scroll blade and the second scroll blade, the first casing has a radially inwardly extending arc and is located at The turbine blades are away from the turbine cover surface on one side of the first substrate. The turbine cover surface, the turbine blades, and the first substrate cooperate to define a plurality of angularly spaced vortex channels, and each vortex channel is turned inward Connected outside and wide inside and narrow outside. The rotary scroll compressor according to claim 4, wherein the first casing further has a plurality of first guide surfaces formed adjacent to each other and formed on a side adjacent to the second casing. The second casing has a plurality of second diversion surfaces adjacent to the first casing and corresponding to the first diversion surfaces. The first diversion surfaces, the second diversion surfaces, the first vortex. An outer peripheral surface of the coil unit and an outer peripheral surface of the second scroll unit cooperate to define a guide channel connecting the outer side of the vortex channels and the spiral inlets. The rotary scroll compressor according to claim 5, wherein the casing unit further includes an input casing connected to one side of the first casing away from the second casing, and the input casing has an input casing An accommodating space communicating with the inside of the vortex channels, and an input port communicating from the accommodating space to the outside and allowing the working fluid to enter. The rotary scroll compressor according to claim 6, wherein the casing unit further includes a first bearing installed in the center of the input casing, and the first scroll unit further includes a first base plate The first shaft tube protruding from the same body toward the center of the turbine blades. The rotary scroll compressor further includes a driving unit for driving the rotation of the first scroll unit. The driving unit includes a driving unit installed on the input. The motor of the casing has a driving shaft passing through the first bearing and inserted into the first shaft tube. The rotary scroll compressor according to claim 7, wherein the driving unit further includes a connecting sleeve provided on the periphery of the driving shaft and located between the first bearing and the first shaft tube, and a connecting sleeve A bearing cover connected to the input housing at the periphery of the shaft sleeve and a first sealing ring interposed between the shaft sleeve and the bearing cover. The rotary scroll compressor according to claim 7 or 8, wherein the second substrate has a perforation provided on the second center line and communicating with the spiral outlet, and the second scroll unit further includes a communication The second shaft tube that is perforated and protrudes from the second substrate in a direction away from the second scroll, and the casing unit further includes an output that connects the second casing away from one side of the first casing. A housing, the rotary scroll compressor further includes a shaft seat unit, the shaft seat unit comprising a bearing seat installed in the output housing and supporting the second base plate and surrounding the periphery of the second shaft tube, A second bearing installed between the bearing seat and the second shaft tube, a shaft seat cover connected to one side of the bearing seat away from the second base plate, and a second shaft tube and the shaft seat A second seal ring between the covers, the shaft seat cover has an output port that communicates with the perforation and allows the working fluid to be discharged. The rotary scroll compressor according to claim 9, wherein the shaft seat unit further includes an adjusting member that is radially screwed between the output housing and the bearing seat, and can be driven by rotating the adjusting member. The bearing seat is moved relative to the output casing together with the second scroll unit to adjust the degree of engagement between the second scroll piece and the first scroll piece.