JPH09329091A - Scroll type fluid device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate requirement on the flange part of a drive shaft and that on limitation of inserting direction in relation to the bearing hole of the drive shaft by providing a thrust support part for supporting a slide bush in the axial direction on a mounting structure having a bearing hole. SOLUTION: A thrust supporting part 43 is provided on a mounting structure 13 and a slide bush 14 is supported in an axial direction so as to make the flange part of a drive shaft 31 unnecessary and the drive shaft 31 can be inserted in either direction through the bearing hole 14 of the mounting structure 13. In addition, after applying shrinkage fit of the rotor 39 of a motor 37 to the drive shaft 31 so as to realize integration of above both components, the drive shaft 31 is inserted in the bearing hole 14 and the boss part 25 of a movable scroll 23 can be fitted to a drive pin 32 on its tip end and no thermal influence may be exerted on the bearing part at the time of shrinkage fit. Consequently, the drive shaft 31 is improved in its assembling property so as to reduce a material expense and working expense for aiming at cost down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll type fluid device provided with a scroll compression mechanism, and more particularly, a movable bush is slid in a radial direction by interposing a slide bush between the movable scroll and a drive pin of its drive shaft. It belongs to the technical field of what made possible.

[0002]

2. Description of the Related Art Generally, in a scroll type fluid device of this type, as a sealing structure for hermetically sealing a compression chamber between a fixed scroll and a movable scroll, a boss portion of the movable scroll is provided in an eccentric drive pin at a tip of a drive shaft. Instead of being rotatably fitted, the movable scroll is supported by the drive pin so as to move in the radial direction, and a gap is formed between the scrolls of the fixed and movable scrolls, and the gap is hermetically sealed by oil mixed with gas. The movable sheave is fitted to the drive pin so as to be slidable in the radial direction so that the eccentricity of the movable sheave is variable, and the scroll body of the movable scroll is pressed against the scroll body of the fixed scroll. It is roughly divided into the one in which the compression chamber is hermetically sealed.

In the latter case, a cylindrical slide bush is inserted between the inner peripheral surface of the boss portion of the movable sheave and the outer peripheral surface of the drive pin so as to be movable in the radial direction with a gap from the outer peripheral surface of the drive pin. By the movement of the slide bush, the movable scroll can be slid in the radial direction.

By the way, since a centrifugal force acts on the orbiting scroll during its revolution, the action of the centrifugal force causes the orbiting scroll to slide in the radial direction, and the scroll body is pressed against the scroll body of the fixed scroll, whereby both scrolls are swirled. The compression chamber between the bodies can be hermetically sealed.

At this time, the centrifugal force of the movable scroll increases or decreases according to the rotation speed of the drive shaft (revolution speed of the movable scroll), and the pressing force between the spiral bodies increases as the rotation speed increases. However, a large amount of gas leaks from the compression chamber between the scrolls occurs at low speed rotation, and the centrifugal force at this time is small, so in the case of sliding the movable scroll by the centrifugal force as described above, The requirements for the characteristics of preventing gas leakage cannot be met accurately.

[0006] Therefore, in the past, for example, the actual exploitation Sho 62-823.
As disclosed in Japanese Patent Publication No. 92, etc., a counterweight portion is integrally formed on the slide bush, and the centrifugal force of the movable scroll is offset by the centrifugal force generated in the counterweight portion, thereby substantially reducing the centrifugal force of the movable scroll. It has been proposed to eliminate it. In this structure, the movable scroll is slid by the pressure of the gas compressed in the compression chamber, and the scroll is pressed against the scroll of the fixed scroll to seal the scroll.

[0007]

However, in the above-mentioned proposal, the drive shaft is integrally formed with a collar, and the flange receives the axial load of the slide bush with the counter weight. Therefore, the amount of material of the drive shaft is increased by the amount of the flange portion, and a process for processing the flange portion is required, which is disadvantageous in terms of cost.

Although the drive shaft is inserted into and supported by the bearing hole of the frame, the inserting direction of the drive shaft into the bearing hole is limited. That is, the drive shaft is connected to the motor for driving the movable scroll, and the drive shaft and the rotor (rotor) of the motor are fixedly integrated by shrink fitting. In this case, if there is the above-mentioned collar portion, when the rotor of the motor is shrink-fitted in advance to the drive shaft to be integrated and sub-assembled, then the drive shaft is inserted from the motor side into the bearing hole of the frame for supporting the drive shaft. It is impossible due to the interference of the brim. Therefore, it is necessary to first insert the drive shaft into the bearing hole from the side opposite to the motor, and then to shrink-fit the rotor on the drive shaft. Then, the shrink fitting causes a problem that the bearing portion is thermally affected.

The present invention has been made in view of the above points, and an object thereof is to improve the support structure of the slide bush described above to eliminate the need for a flange portion on the drive shaft and to insert the drive shaft into the bearing hole. The purpose is to eliminate the restriction on the direction and reduce the material cost and processing cost of the drive shaft to reduce the cost.

[0010]

In order to achieve the above object, according to the present invention, a thrust support portion for receiving a load in the axial direction of the slide bush is formed on a frame for supporting the drive shaft. I tried to support thrust on the frame.

Specifically, in the invention of claim 1, as shown in FIGS. 1 and 3, a frame (1) having a bearing hole (14) is provided.
3), a fixed scroll (17) having an end plate (18) and a scroll (20) protruding from the end plate (18), and an end plate (24) having a boss portion (25) formed in the center thereof; The fixed scroll (1) is projectingly provided on the end plate (24).
7) A scroll (23) having a spiral body (26) that meshes with the spiral body (20) so as to define a compression chamber (28). The movable scroll (23) is revolved to revolve the compression chamber (23). A scroll compression mechanism (16) for compressing gas at (28) and a bearing hole (14) of the frame (13) are rotatably supported, and the tip end thereof is provided in a boss portion (25) of the movable scroll (23). A drive shaft (31) that is rotatably fitted and has a drive pin (32) that is eccentric to the axis of rotation, and that drives the orbiting scroll (23) to revolve, and the boss of the orbiting scroll (23). It is movably fitted in a radial direction between the inner surface of the portion (25) and the outer surface of the drive pin (32), and generates a centrifugal force in a direction that cancels the centrifugal force of the movable scroll (23) when it orbits. Coun Scroll fluid device that includes a slide bush (41) having weighting section (41c) is premised.

The frame (13) is provided with a thrust support portion (43) for axially supporting the slide bush (41).

With this structure, the frame (13) is provided with the thrust supporting portion (43), and the thrust supporting portion (4) is provided.
Since the slide bush (41) is axially supported by 3), it is not necessary to provide the drive shaft (31) with a collar portion as in the conventional case. Therefore, the material cost and the processing cost of the drive shaft (31) can be reduced by the amount of the flange portion to reduce the cost.

Further, since the drive shaft (31) has no rib portion, the drive shaft (31) can be inserted into the bearing hole (14) of the frame (13) from any direction, and the drive shaft (31) It is possible to improve the assembling property of 31). Further, after the rotor (39) of the motor (37) is shrink-fitted and integrated with the drive shaft (31) in advance, the drive shaft (31) is inserted into the bearing hole (14) and the drive pin at the tip thereof is inserted. (32)
The boss portion (25) of the orbiting scroll (23) can be fitted to the bearing, and the bearing portion is not affected by heat during shrink fitting.

According to the second aspect of the present invention, as shown in FIG. 2, the scroll body (26) of the movable scroll (23) in which the gas pressure of the compression chamber (28) is fixed is fixed to the outer periphery of the drive pin (32). 17) is provided with a pin side slide surface (45) extending in the pressing direction to press against the spiral body (20),
A bush-side slide surface (46) which is in sliding contact with the pin-side slide surface (45) is provided on the inner circumference of the slide bush (41).

Further, due to the difference between the outer diameter (d2) of the drive pin (32) and the inner diameter (d1) of the slide bush (41), a predetermined distance is provided between the outer surface of the drive pin (32) and the inner surface of the slide bush (41). The gap (42) is formed, and the slide amount of the movable scroll (23) in the pressing direction is regulated by the gap (42).

In this way, the slide bush (41) of the drive pin (32) is slidably brought into sliding contact with the slide surface (46) of the bush (41) of the slide bush (41) to slide the slide bush (41). The movable scroll (23) keeps its spiral body (2) until the rear side of the inner peripheral surface of the slide direction in contact with the outer peripheral surface of the drive pin (32).
It is moved and guided in the pressing direction of 6). Therefore, while performing the slide guide of the movable scroll (23), the drive pin (32) and the slide bush (41) itself can restrict the movement of the movable scroll (23) in the same direction, and the movable scroll (23). It is not necessary to separately provide a member for restricting the amount of sliding, and the number of parts can be reduced.

Moreover, as described above, the drive pin (3
The sliding amount in the pressing direction of the movable scroll (23) is restricted by the gap (42) between the outer diameter (d2) of 2) and the inner diameter (d1) of the slide bush (41), so that the compression chamber is compressed. Even when the gas pressure in (28) is not high, the relative positions of the scrolls (20), (26) of the fixed and movable scrolls (17), (23) are properly maintained, and the assembly of the device is well performed. In order to check whether or not the compression is performed, it is possible to easily check the compression torque for sucking and compressing the air in the compression chamber (28) by the drive revolution of the orbiting scroll (23).

When the slide bush (41) is fitted to the drive pin (32), the drive pin (3
It suffices to assemble so that the bush side slide surface (46) of the slide bush (41) matches the pin side slide surface (45) of 2), and the assembly can be performed easily.

In the invention of claim 3, the above-mentioned claim 1 or 2
In the scroll type fluid device of the invention, a stop ring (48) for restricting the axial movement of the slide bush (41) is attached to the outer periphery of the drive pin (32). As a result, the axial movement of the slide bush (41) can be restricted by the retaining ring (48) having a simple structure.

[0021]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 3 shows a scroll compressor (C) for a refrigeration system as a scroll type fluid device according to an embodiment of the present invention, in which (1) is a vertically extending hermetically cylindrical housing. A partition plate (2) is arranged on the upper side of the inside of the partition plate (2) so that the space inside the housing (1) is divided by the partition plate (2) into a high pressure chamber (6) on the upper side of the partition plate (2) and a low pressure on the lower side. It is divided into a room (7). A recess (3) is formed at the center of the lower surface of the partition plate (2), and a discharge hole (4) penetrating to the high pressure chamber (6) is formed at the bottom of the recess (3). A discharge valve (9) for opening and closing the discharge hole (4) is provided at the center of the upper surface of the partition plate (2).
Is attached and fixed by a ring-shaped valve retainer (10), and the discharge valve (9) has a high pressure chamber (6) when the pressure in the recess (3) (the discharge port (19) of the compression mechanism (16) described later) is high. )
It is composed of a check valve that opens the discharge hole (4) when the temperature is higher than the above, and closes it when the temperature is lower than the above. (11) is a bolt for attaching the valve retainer (10) to the partition plate (2).

In the low pressure chamber (7), a frame (13) is arranged below the partition plate (2) with a predetermined distance from the partition plate (2). This frame (13) includes a main body (13a) having a substantially bottomed cylindrical shape that is open upward, and the main body (13a).
A flange portion (13b) protruding radially outward from the upper end outer peripheral portion of the main body and a cylindrical portion (13c) extending downward from the center portion of the bottom wall of the main body (13a).
The frame (13) is fixed to the inner surface of the housing (1) at the outer peripheral edge of b). Further, a bearing hole (14), which is a through hole penetrating through the bottom wall of the main body (13a) in the vertical direction, is opened in the cylindrical portion (13c).

A scroll compression mechanism (16) is arranged in the low pressure chamber (7) between the partition plate (2) and the frame (13). The scroll compression mechanism (16) includes an upper fixed scroll (17) fixed to the housing (1) so that it cannot rotate, and a lower movable scroll that revolves (rotates) in combination with the fixed scroll (17). (2
3). The fixed scroll (17) includes a disk-shaped end plate (18) and a spiral (involute) spiral body (20) protruding from the lower surface of the end plate (18). A cylindrical portion (18a) extending downward is integrally formed on an outer peripheral edge portion of the fixed scroll (17), and the fixed scroll (17a) has a fastening bolt (2).
It is fixed to the frame (13), that is, the housing (1) by 1).

Further, the end plate (1) of the fixed scroll (17) is
8) At the central portion of the upper surface, a protruding portion (18) fitted in the recessed portion (3) on the lower surface of the partition plate (2) in an airtight sealed state.
b) is integrally formed, and the discharge port (1) penetrates from the upper surface of the protruding portion (18b) to the central portion of the lower surface of the end plate (18).
9) is formed.

On the other hand, the movable scroll (23) has the same structure as that of the fixed scroll (17), and has a disk-shaped end plate (24) whose lower surface is slidably supported on the upper end surface of the frame (13). ) And a spiral spiral body (26) projectingly provided on the upper surface of the end plate (24), the spiral body (26)
Is the compression chamber (2) that communicates with the discharge port (19) between the scroll (20) of the fixed scroll (17).
8) is meshed so as to form a partition. The end plate (24) is supported on the frame (13) via an Oldham's joint (30). The Oldham's joint (30) causes the movable scroll (23) to revolve while restricting its rotation to move the movable scroll (23). Due to the revolution of the scroll (23), the compression chamber (28) between the scrolls (17) and (23) moves from the outer peripheral edges of the spirals (20) and (26) to the low pressure chamber (7).
After sucking the refrigerant gas inside, the gas is compressed in the compression chamber (28) and discharged from the discharge port (19) at the center of the end plate (18) of the fixed scroll (17).

The bearing hole (1) at the center of the frame (13)
An upper end portion of a crank shaft (31) as a drive shaft is rotatably inserted in 4), and a lower end portion of the crank shaft (31) is a bearing member (34) fixedly attached to an inner lower end portion of the housing (1). The central bearing portion (35) is rotatably supported while being subjected to an axial thrust load. The upper end (tip) of the crankshaft (31) is connected to the frame (13).
The drive pin (32) projects from the bearing hole (14) into the body (13a) and is eccentric by a predetermined amount with respect to the rotation axis of the crankshaft (31). In addition, at the center of the lower surface of the end plate (24) of the movable scroll (23), there is integrally formed a bottomed cylindrical boss portion (25) located inside the main body (13a) of the frame (13). The drive pin (32) at the upper end (tip) of the crankshaft (31) is rotatably fitted to the boss (25).

Further, an electric motor (3) for driving the movable scroll (23) is provided below the low pressure chamber (7).
7) is provided. The motor (37) includes a substantially cylindrical stator (3) fixed to the inner surface of the housing (1).
8) and a cylindrical rotor (39) rotatably arranged in the stator (38).
The crankshaft (31) is fixed to the center hole of the crankshaft (31) by shrink fitting so as to rotate integrally with the crankshaft (3).
By the rotation of 1), the movable scroll (23) is revolved while the rotation of the Oldum coupling (30) is restricted.

The boss (2) of the movable scroll (23)
5) A slide bush (41) is fitted between the inner surface and the outer surface of the drive pin (32) so as to be movable in the radial direction. The slide bush (41) has an inner diameter (d1) of the drive pin (3) as shown in enlarged detail in FIGS.
2) A substantially cylindrical bush body (41) having a larger diameter than the outer diameter (d2) and fitted outside with a predetermined gap (42) around the drive pin (32).
a) and one predetermined side portion of the outer periphery of the lower end of the bush body (41a) are integrally connected via a connecting portion (41b),
The counterweight portion (41c) is located outside the boss portion (25) and has a predetermined weight corresponding to the scroll body (26) of the movable scroll (23). And
With the rotation of the slide bush (41), the movable scroll (2) is moved by its counterweight portion (41c).
The centrifugal force in the direction (3), which cancels out the centrifugal force at the time of revolution, is generated (leftward in FIGS. 1 and 2).

The frame (13) is provided with a thrust support portion (43) formed by projecting the peripheral portion of the bearing hole (14) upward on the inner bottom surface of the body (13a). The slide bush (41) is axially supported on the upper end of the support portion (43) with its lower surface in contact.

Further, as shown in FIG. 2, the outer periphery of the drive pin (32) is covered with the both scrolls (1
The gas pressure of the compression chamber (28) between the scrolls (20) and (26) of (7) and (23) changes the scroll (26) of the movable scroll (23) to the scroll (20) of the fixed scroll (17). A pin side slide surface (45) is formed by notching in a flat shape so as to extend in the pressing direction (A) to be pressed against. On the other hand, on the inner circumference of the slide bush (41), there is provided a bush side slide surface (46) formed by bulging the inner circumference in a plane so as to be in sliding contact with the pin side slide surface (45). Then, due to the difference between the outer diameter (d2) of the drive pin (32) and the inner diameter (d1) of the slide bush (41), a predetermined gap () between the outer surface of the drive pin (32) and the inner surface of the slide bush (41) ( 42)
The amount of sliding of the movable scroll (23) in the pressing direction (A) is regulated.

Further, a substantially C-shaped C-shaped stop ring (48) is attached to the upper end of the outer periphery of the drive pin (32), and the C-shaped stop ring (48) causes the slide bush (41) to move. It is designed to restrict movement in the axially upper direction.

In FIG. 3, (50) is the housing (1).
A suction pipe fixed to the side wall of the housing so as to communicate with the low pressure chamber (7), and a suction pipe (51) penetrates the upper wall of the housing (1) and communicates with the high pressure chamber (6). The discharge pipe fixedly attached in this manner, (52) is an oil sump provided in the lower part of the housing (1) for accumulating lubricating oil. Also,
Reference numeral (53) is an oil pump provided at the lower end of the crankshaft (31), which sucks and discharges the lubricating oil in the oil sump (52), and then extends in the crankshaft (31) in the axial direction. A bearing hole (14) of a predetermined portion of the scroll compression mechanism (16) or a frame (13) through an oil passage (not shown)
Etc.

Therefore, in the scroll compressor (C) of the above embodiment, the electric motor (3
The crankshaft (31) is rotated by 7) and the end plate (2) is attached to the drive pin (32) at the upper end of the crankshaft (31).
4) The movable scroll (23) connected by the boss portion (25) on the lower surface is driven and revolves while its rotation is restricted by the Oldham coupling (30). With the revolution of the orbiting scroll (23), the volume of the compression chamber (28) formed between the scroll (26) and the scroll (20) of the fixed scroll (17) decreases and changes. As a result, the refrigerant gas in the low pressure chamber (7) in the housing (1) is transferred to the compression chamber (28) between the fixed and movable scrolls (17) and (23) in both spiral bodies (20) and (26). The compressed gas is sucked in from the outer peripheral portion and compressed due to the reduction of the volume of the compression chamber (28), and the compressed gas is converted into the end plate (1) of the fixed scroll (17).
8) After reaching the discharge hole (4) of the partition plate (2) through the central discharge port (19) and being supplied from the discharge hole (4) to the high pressure chamber (6) by opening the discharge valve (9). , Is discharged from the high pressure chamber (6) to the discharge pipe (51).

At this time, the movable scroll (2
The slide bush (41) arranged between the boss portion (25) and the drive pin (32) of 3) also rotates around the axis of the crankshaft (31) and is centrifuged by the counterweight portion (41c). A force is generated, and this centrifugal force cancels the centrifugal force of the orbiting scroll (23) to substantially eliminate the centrifugal force of the orbiting scroll (23), and the scroll body (26) of the orbiting scroll (23) is compressed into the compression chamber. The compression chamber (28) is hermetically sealed by being pressed against the scroll body (20) of the fixed scroll (17) by the gas pressure of (28).

Then, the slide bush (41)
Is a thrust support portion (4) projecting around the bearing hole (14) on the inner bottom surface of the main body (13a) of the frame (13).
It rotates while being supported in the axial direction by 3). Therefore, it is not necessary to provide a flange portion for supporting the slide bush (41) on the crankshaft (31) as in the conventional case,
The material cost and the processing cost of the crankshaft (31) can be reduced by the amount of the flange portion to reduce the cost.

Further, since the crankshaft (31) is not provided with the flange portion as described above, when the crankshaft (31) is assembled, the crankshaft (31) is fitted with the bearing hole (14) of the frame (13). Can be inserted from below the frame (13),
The assemblability of the crankshaft (31) can be improved. Moreover, in this way, the crankshaft (31) is connected to the bearing hole (1
When the rotor (39) of the motor (37) is attached to the crankshaft (31), the motor (37) can be inserted into the crankshaft (31) first.
After the rotor (39) of the above is shrink-fitted and integrated, the crankshaft (31) is inserted into the bearing hole (14) from the lower side of the frame (13), and the drive bush (32) at the upper end thereof is fitted with the slide bush. The boss portion (25) of the orbiting scroll (23) may be fitted through the (41), and conversely, the crankshaft (31) is inserted into the bearing hole (14) of the frame (13). The bearing portion of the crankshaft (31) is not affected by heat during shrink fitting, as in the case of shrink fitting with the rotor (39) of the motor (37).

The gas pressure in the compression chamber (28) is movable around the outer periphery of the drive pin (32) in the movable scroll (23).
In the slide bush (41), the pin side slide surface (45) is formed so as to extend in the pressing direction (A) for pressing the spiral body (26) of the fixed scroll (17) against the spiral body (20) of the fixed scroll (17). A bush side slide surface (46) slidably contacting the pin side slide surface (45) is provided on the circumference, and the difference between the outer diameter (d2) of the drive pin (32) and the inner diameter (d1) of the slide bush (41). This forms a predetermined gap (42) between the outer surface of the drive pin (32) and the inner surface of the slide bush (41).
Since the slide amount of the movable scroll (23) in the pressing direction (A) is regulated by 2), the slide bush (41) is revolved when the movable scroll (23) revolves (when the slide bush (41) rotates). The bush side slide surface (46) is slidably brought into contact with the pin side slide surface (45) of the drive pin (32) to slide, and the rear side in the sliding direction of the inner peripheral surface of the slide bush (41) is the drive pin (32) outer periphery. Movable scroll (2
3) is moved and guided in the pressing direction (A) of the spiral body (26). Therefore, while the slide guide of the movable scroll (23) is being performed, the movement of the movable scroll (23) in the same direction (A) can be restricted by the drive pin (32) and the slide bush (41) itself. A pin or the like for regulating the slide amount of (23) is not required separately, and the number of parts can be reduced.

Moreover, as described above, the drive pin (3
The sliding amount of the movable scroll (23) in the pressing direction (A) is restricted by the gap (42) between the outer diameter (d2) of 2) and the inner diameter (d1) of the slide bush (41). Even when the pressure in the compression chamber (28) is not high, the relative positions of the scrolls (20) and (26) of the fixed and movable scrolls (17) and (23) are properly maintained. Therefore, after assembling the compressor (C), in order to inspect whether or not the assembling is performed well, the drive revolution of the orbiting scroll (23) sucks air instead of refrigerant gas into the compression chamber (28). When checking the compression torque to be compressed, the check can be easily performed.

When the slide bush (41) is fitted to the drive pin (32) during the assembly of the compressor (C), the slide bush (41) is attached to the pin side slide surface (45) of the drive pin (32). It suffices to assemble so that the bush-side slide surface (46) of the above-mentioned item matches, and the assembly can be easily performed.

Further, a C-shaped stop ring (48) is attached to the upper end of the outer periphery of the drive pin (32), and the stop ring (48) restricts the movement of the slide bush (41) in the axial direction. Therefore, the stop ring (48) having a simple structure can regulate the axial movement of the slide bush (41).

Although the above embodiment is applied to the scroll compressor (C) for a refrigeration system, the present invention is
It can also be applied to other scroll type fluid devices.

[0042]

As described above, according to the invention of claim 1, the eccentric drive pin of the drive shaft inserted into the bearing hole of the frame is fitted into the boss portion of the movable scroll of the scroll compression mechanism, and the movable scroll is moved. In a scroll type fluid device, a slide bush having a counter weight portion that generates a centrifugal force that cancels the centrifugal force at the time of revolution of the movable scroll is inserted between the inner surface of the boss portion and the outer surface of the drive pin so as to be radially movable. By providing the frame with a thrust support portion for axially supporting the slide bush, it is not necessary to provide a flange portion for axially supporting the slide bush on the drive shaft as in the conventional case. The material cost and processing cost of the drive shaft can be reduced by the amount of the above, and the cost can be reduced, and the drive shaft can be inserted into the bearing hole of the frame. Eliminating the restrictions, it is possible to improve the like of the assemblability.

According to the second aspect of the present invention, the pin side slide extending on the outer periphery of the drive pin in the pressing direction in which the gas pressure of the compression chamber between the fixed and movable scrolls presses the scroll of the movable scroll against the scroll of the fixed scroll. The surface is notched, and the bush side slide surface that slides in contact with the above-mentioned pin side slide surface is provided on the inner circumference of the slide bush.By utilizing the predetermined gap between the drive pin outer surface and the slide bush inner surface, By controlling the slide amount, the drive pin and slide bush itself regulate the movement of the movable scroll in the same direction while guiding the movement of the scroll of the movable scroll in the pressing direction, reducing the number of parts. Etc., and maintain the relative position between the scrolls of the fixed and movable scrolls properly to ensure empty space. Ease of compression torque check by compression, and it is possible to facilitate the assembly of the drive pin of the slide bush, according to the invention of claim 3,
By attaching the stop ring for restricting the axial movement of the slide bush to the outer periphery of the drive pin, the axial movement of the slide bush can be restricted by the stop ring having a simple structure.

[Brief description of drawings]

FIG. 1 is an enlarged cross-sectional view showing a main part of an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a cross-sectional view showing the overall configuration of a scroll compressor according to the embodiment of the present invention.

[Explanation of symbols] (C) Scroll compressor (1) Housing (13) Frame (14) Bearing hole (16) Scroll compression mechanism (17) Fixed scroll (18) End plate (20) Spiral body (23) Movable scroll ( 24) End plate (25) Boss (26) Spiral body (28) Compression chamber (31) Crankshaft (drive shaft) (32) Drive pin (d2) Drive pin outer diameter (37) Motor (39) Rotor (41) Slide bush (41c) Counter weight (d1) Slide bush inner diameter (42) Gap (43) Thrust support (44) Pin side slide surface (45) Bush side slide surface (48) C-shaped retaining ring

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshitaka Shibamoto, 3-12 Tsukiko Shinmachi, Sakai City, Osaka Prefecture Daikin Industries, Ltd. Sakai Plant Co., Ltd. Inside the seaside factory (72) Inventor Shusaku Ueda 3-12, Chikko Shinmachi, Sakai City, Osaka Prefecture Address Daikin Industrial Co., Ltd. Sakai Plant inside the seaside factory

Claims (3)

[Claims] 1. A frame (13) having a bearing hole (14)
A fixed scroll (17) having an end plate (18) and a scroll (20) projecting from the end plate (18), an end plate (24) having a boss portion (25) formed at the center, and the end plate (24). Two
4) A movable scroll (23) having a spiral body (26) protruding from the fixed scroll (17) and meshing with the spiral body (20) of the fixed scroll (17) so as to define a compression chamber (28).
The scroll compression mechanism (16) for compressing gas in the compression chamber (28) by the orbital movement of the movable scroll (23) and the bearing (14) rotatably supported in the bearing hole (14) of the frame (13), At the tip of the boss (2) of the movable scroll (23)
5) has a drive pin (32) rotatably fitted in it and is eccentric to the axis of rotation, and has a movable scroll (2).
3) is inserted between the drive shaft (31) that drives the revolving shaft 3) and the inner surface of the boss (25) of the movable scroll (23) and the outer surface of the drive pin (32) so as to be movable in the radial direction, A slide bush (4) having a counterweight portion (41c) that generates a centrifugal force that cancels the centrifugal force when the orbiting movable scroll (23) revolves with the rotation.
1) A scroll type fluid device comprising the frame (13) and a thrust support portion (43) for axially supporting the slide bush (41). 2. The scroll type fluid device according to claim 1, wherein the scroll body (26) of the movable scroll (23) having a gas pressure of the compression chamber (28) is fixed to the outer periphery of the drive pin (32). ) Is provided with a pin side slide surface (45) extending in the pressing direction to press against the spiral body (20), and a bush side slide surface (46) slidably contacting the pin side slide surface (45) on the inner circumference of the slide bush (41). ) Is provided, and the difference between the outer diameter (d2) of the drive pin (32) and the inner diameter (d1) of the slide bush (41) causes a predetermined distance between the outer surface of the drive pin (32) and the inner surface of the slide bush (41). A scroll type flow, characterized in that a gap (42) is formed, and the gap (42) regulates the amount of sliding of the movable scroll (23) in the pressing direction. Apparatus. 3. The scroll type fluid device according to claim 1 or 2, wherein a slide bush (4) is provided on an outer periphery of the drive pin (32).
1) Stop ring (4) that restricts axial movement of
8) A scroll type fluid device having the above-mentioned 8 attached.