JP2003202030A - Scroll fluid machinery - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide scroll fluid machinery with increased reliability by rigidly and easily holding the bearings of a drive crankshaft or a pin crankshaft as the self-rotation prevention mechanism of a swing scroll. <P>SOLUTION: Bearing storage parts 11m and 36a fitted to a swing scroll 11 side through a second rolling bearing 19 and having one side opening to at least one scroll side are installed at crank parts 22 of crankshafts 22 and 23 rotatably pivoted on a fixed scroll 3 through a rolling bearing 20. The rolling bearings are stored in the bearing storage parts, and screw parts 11b and 36b are formed on the peripheral faces of openings of the bearing storage parts. At least the outer rings of the rolling bearings are positionally held by bearing holding members screwed into the screw parts. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll fluid machine for compressing, expanding and pumping a fluid.

[0002]

2. Description of the Related Art Conventionally, in an oilless scroll compressor, as shown in FIG. 4, the rotational force transmitted from a motor (not shown) via a drive pulley 31 rotates a drive shaft 23 to drive the same. The eccentric portion (crank portion) 22 that is eccentric to the shaft 23 and forms a crank shaft is transmitted to the orbiting scroll 111 from the connecting portion of the orbiting crawl 111, which makes the orbiting scroll 111 move relative to the fixed scroll. Will perform a revolution movement.

Therefore, in the connecting portion of the orbiting scroll 111, the eccentric portion (crank portion) 22 of the drive shaft 23 is fitted to the inner ring of the bearing 19, and the outer ring is pressed by the bearing cover 126 and fixed to the connecting portion. To be done. The bearing cover 12
The fixing of 6 to the connecting portion is carried out by screwing the flange portion of the bearing cover 126 to the edge of the connecting portion of the orbiting scroll 111 with four setscrews as shown in FIG.

However, in the orbiting scroll 111, since the connecting portion rotates on the mirror surface of the fixed scroll with a predetermined radius of rotation and the amount of revolution is regulated, the connecting portion makes a circular motion parallel to the mirror surface. The bearing cover 126, which is covered with the connecting portion, receives a stress in the circular direction and generates vibration.

[0005]

That is, the eccentric part (crank part) 22 connected to the connecting part of the crankshaft and the axis of the drive shaft 23 are required to be parallel to each other.
If this parallelism is insufficient, the rotation of the crankshaft causes the crankshaft to cross in the direction intersecting the shaft center, and the inner rings of the rolling bearings 19 and 20 generate stress in the direction intersecting the shaft center and in the shaft center direction. The stress in the axial direction acts in the direction of separating the bearing covers 126 and 127 from the outer ring via the outer ring.

Particularly, in a large-capacity scroll compressor, the amount of air used, the pressure, the change in the number of revolutions by the inverter, the eccentric part (crank part) 22 and the drive shaft 23 connected to the above-mentioned connecting part are constituted. The shaft bears due to the machining accuracy of the crankshaft, and load stress is applied to the bearing due to the start and stop of the compressor. The load stress pushes up the bearing covers 126, 127 in the direction of the drive shaft axis through the bearings as described above, and the bearing covers 126, 127 are damaged along with the damage of the setscrew. Therefore, the scroll mechanism collides with the scroll mechanism. To be damaged.

In view of the above-mentioned circumstances, the present invention makes it possible to firmly and easily hold the bearings of the drive crankshaft or the pin crankshaft which is the rotation preventing mechanism of the orbiting scroll, thereby improving the reliability of the scroll fluid. The purpose is to provide a machine.

[0008]

SUMMARY OF THE INVENTION According to the present invention, a crank portion of a crankshaft rotatably supported on a fixed scroll side via a first rolling bearing, and a orbiting scroll side via a second rolling bearing. In a scroll fluid machine, which is fitted to a scroll fluid machine for imparting a swiveling force to the orbiting scroll side by rotation of the crankshaft, a bearing accommodating portion having one side opening on the at least one scroll side is provided, and a rolling bearing is provided in the bearing accommodating portion. And at least an outer ring of the rolling bearing can be held in position by a bearing holding member having a threaded portion threaded on an opening circumferential surface of the bearing housing portion and screwed into the threaded portion. And

According to the present invention, a crank portion of a crankshaft rotatably supported on a fixed scroll side via a first rolling bearing is fitted to a orbiting scroll side via a second rolling bearing, The present invention relates to a scroll fluid machine that applies a turning force to the orbiting scroll side by rotation of a crankshaft, and is applied not only to the present embodiment shown in FIG. 1 but also to a type that obtains a turning drive force from a central portion of a scroll plate. It is possible, and not only the double wrap type but also the single wrap type may be used.

Also, the at least one scroll side,
That is, on the scroll side, which may be the orbiting scroll side or the fixed scroll side, a bearing accommodating portion having an opening on one side is provided, and a screw portion is threaded on the opening peripheral surface of the bearing accommodating portion. Here, "screw the screw part on the peripheral surface of the opening"
The thread may be threaded on the inner circumference of the opening. Moreover, a screw thread may be threaded on the outer periphery of the opening. That is, this opening is provided at a certain portion on the scroll side, and when the opening is recessed at that portion, the periphery of the opening may be formed in a cylindrical shape. In that case, the outer circumference of the opening is formed. Threads are engraved on.

Since the rolling bearing is housed in the bearing housing having the U-shaped cross section, at least the outer ring of the rolling bearing can be held in position by the bearing holding member screwed into the threaded portion. The rolling bearing is fixed and held in the bearing accommodating part by adjusting the screwing of the bearing holding member, preventing the rolling bearing from swinging in the bearing accommodating part even if stress is applied to the rolling bearing in the axial direction. It is possible to reduce the generation of stress.

Therefore, a change in the number of rotations of the motor used in the scroll fluid machine, a shaft deviation due to the machining accuracy of the crankshaft,
Even if a load stress is applied to the bearing due to the start and stop of operation of the fluid machine, if the direction of the load stress is in the direction intersecting with the screwing direction of the bearing holding member, the outer circumference of the bearing holding member is Since they are fitted together, a strong holding force is provided to prevent the bearing holding member from floating in that direction, and the bearing holding member collides with other members, damaging the bearing holding member and damaging the scroll mechanism. Can be prevented.

According to the present invention, even in the case of the bearing of the drive crankshaft connected to the rotary drive force source, the drive force is transmitted from the rotary drive force source via the drive crankshaft. It is also applicable to a pin crankshaft bearing that prevents rotation.

It is desirable that the inner ring side of the rolling bearing is held by a stepped surface of the crankshaft or another fixing member. According to such a technical means, it is possible to prevent the inner ring of the rolling bearing from swinging in the bearing accommodating portion and reduce the generation of stress in the axial direction.

Further, the bearing holding member is provided with a flat plate or a tubular member facing the outer surface or the outer peripheral surface of the bearing accommodating portion, and the flat plate or the tubular member is provided with an elongated hole extending in the rotational direction, It is desirable to fix the screwing position so that the screwing position can be adjusted by a screw member screwed to the bearing housing portion side through the elongated hole. It is desirable that the position of the elongated hole is provided at a position concentric with the center of screwing of the bearing holding member.

According to this technical means, the bearing holding member can be prevented from being screwed back from the bearing screwing fixed position in the loosening direction by the screw tightening through the elongated hole. That is, according to such a technical means, not only the load stress in the direction intersecting with the screwing direction but also the loosening of the bearing holding member in the screwing direction can be prevented, and the space between the bearing holding member and the bearing can be prevented. Occurs, the bearing and the bearing holding member collide with each other to increase the size of the void, and finally the bearing holding member can be prevented from falling off.

Further, the crankshaft may be a driving crankshaft which is driven by receiving a rotational force from a motor, and the bearing holding member may be located on the outer surface of the fixed scroll side on the motor drive shaft side. It is an effective means of the present invention.

According to the above technical means, it is possible to prevent the inner ring of the rolling bearing from swinging in the bearing housing portion on the motor drive shaft side, and to reduce the generation of stress in the axial direction.

[0019]

BEST MODE FOR CARRYING OUT THE INVENTION The present invention will be described in detail below with reference to the embodiments shown in the drawings. However, the dimensions, materials, shapes, relative positions, etc., of the components described in this embodiment are not intended to limit the scope of the present invention thereto, but are merely illustrative examples unless otherwise specified. Not too much.

FIG. 1 is a sectional view of a scroll fluid machine according to an embodiment of the present invention. In FIG. 1, a double-wrap type scroll fluid machine body 1 is arranged between a fixed scroll housing 2 having a housing cover 4A attached thereto, a fixed scroll housing 3 having a housing cover 4B attached thereto, and both fixed scroll housings 2 and 3. The orbiting scroll 11 and the intermediate scroll housing 34 surrounding the outer peripheral side of the orbiting scroll 11, and the crankshaft having the drive shaft 23 and the eccentric portion (crank portion) 22 for restricting the orbiting range of the orbiting scroll 11 are housed. And a crank housing 36.

The orbiting scroll 11 is a double scroll orbiting wrap 10 and 40 which is planted on the mirror surfaces 11c and 11p of the end plates 11f and 11g driven by the eccentric part (crank part) 22 of the crankshaft. It is configured in a lap type.

The fixed scroll housing 2 is formed in the shape of a circular tray, and the distal end portion 23a of the drive shaft 23 is rotatably held by bearings 20 in crank housings 36, which will be described later, at three circumferential positions on the outer peripheral portion thereof. A holding portion 37 for rotatably holding is provided.

In FIG. 1, the fixed scroll housing 2 has a mirror surface 2c provided in a tray-shaped recess. On the mirror surface 2c, a wrap 9 is spirally planted from the vicinity of the discharge port 2d arranged in the center, and a lap groove is formed on the top thereof. The wrap groove is provided with a tip seal 14 that comes into pressure contact with and slides on the mirror surface 11c of the orbiting scroll 11. Further, the outermost lap groove communicates with the fluid suction passage communicating with the suction port 2a. Further, a groove is provided outside the outermost peripheral lap groove, and a dust seal 12 having a self-lubricating property such as a fluorine resin is provided in the groove.

On the back side of the mirror surface 2c of the fixed scroll housing 2, cooling fins 2b are planted.
A housing cover 4A is attached to the top of b to form a cooling passage 2h. Therefore, the fixed scroll housing 2 is driven by the cooling air flowing in the direction passing through the plane of FIG.
Is configured to be cooled.

As shown in FIG. 1, the orbiting scroll 11 has a mirror surface 11c, and the mirror surface 11c is placed in contact with a dust seal 12 provided on the reference surface of the fixed scroll housing 2 so as to face the mirror surface 11c. The orbiting scroll wrap 10 is planted in a spiral shape. A groove is provided at the upper end of these laps, and a chip seal 13 having a self-lubricating property such as a fluorine resin is fitted in the groove. The wall surface of the orbiting scroll wrap 10 and the wall surface of the fixed scroll wrap 9 are arranged to face each other.

On the back side of the mirror surface 11c, cooling fins 11a are planted to form cooling passages 11n. Therefore, by the cooling air flowing in the direction of penetrating the plane of FIG.
The orbiting scroll 11 can be cooled.

An end plate having a mirror surface 11p on which the orbiting scroll wrap 40 on the other side is planted is provided via the cooling fin 11a. Further, the fixed scroll housing 3 having the fixed scroll wrap 5 arranged so as to face the wall surface of the orbiting scroll wrap 40 on the other side is provided, but the orbiting scroll wrap 40 and the fixed scroll housing on the other side are provided. The relationship with 3 is
The combination and operation of members having the same relationship as the orbiting scroll wrap 10 on one side and the fixed scroll housing 2 and having the same functions as in FIG. 3 are performed.

That is, in the fixed scroll housing 3, the wrap 5 is planted on the mirror surface 3c, and the fluid compressed by the orbiting scroll wrap 40 and the fixed scroll wrap 5 is discharged from the discharge port 3d.

A cooling fin 3b is planted on the back side of the mirror surface 3c of the fixed scroll housing 3, and a housing cover 4B is attached to the top of the cooling fin 3b to form a cooling passage 3h. Therefore, the fixed scroll housing 3 can be cooled by the cooling air flowing in the direction passing through the paper surface of FIG.

In FIG. 2, the fixed scroll housing 2 is provided with a holding portion 37 for rotatably holding the tip portion 23a of the drive shaft 23 of the orbiting scroll 11 in a portion divided into three in the circumferential direction on the outer peripheral side. There is. The drive shaft 23 is rotatably held by a bearing 20 provided on the holding portion 37 and a crank housing 36 attached to the fixed scroll housing 2.

The bearing 20 is the crank housing 3
6, the outer ring is fitted in the cylindrical space 36a, and the right end side of the outer ring is brought into contact with the end portion 27d of the bearing cover 27 that is screwed in from the open end side of the cylindrical space 36a. It is fixed to. The bearing cover 27 is provided with a male screw groove 27a to be screwed with a screw groove 36b provided on the open end side of the cylindrical space 36a, and as shown in FIG. 3B, elongated holes 27c, 27c are formed in the flange portion. Is provided, and after the bearing cover 27 is screwed in until the end portion 27d contacts the outer ring of the bearing 20, it can be fixed to the crank housing 36 by the screw 39.

An opening 27b is formed in the bearing cover 27, and the drive shaft 23 is rotatably fitted in the opening 27b through an oil seal 17. Also, the drive shaft 23
An oil seal 16 is provided on the large-diameter portion 21.
Therefore, the oil seals 16 and 17 prevent grease from leaking from the bearing 20.

The eccentric portion 22 which is eccentric with respect to the drive shaft 23 is connected to the orbiting scroll 11 via a bearing 19 in a drive connecting portion 11d provided at a portion of the orbiting scroll 11 which is divided into three parts in the circumferential direction on the outer peripheral side. It is fitted so that a turning drive force can be applied.

The bearing 19 has an outer ring fitted in the three cylindrical cavities 11m of the orbiting scroll 11, and the right end side of the outer ring is screwed into the cylindrical cover 11m from the open end side of the bearing cover 26. 26d abuts on each other and is fixed between the bottom surfaces of the cylindrical cavities. The bearing cover 26 is provided with a male screw groove 26a to be screwed with a screw groove 11b provided on the open end side of the cylindrical cavity 11m, and as shown in FIG. 3A, elongated holes 26c, 26c are formed in the flange portion. Is provided, the bearing cover 26 is screwed in until the end portion 26d abuts on the outer ring of the bearing 19, and then the bearing cover 26 can be fixed to the orbiting scroll 11 by a screw 38.

Further, an opening 26b is opened in the bearing cover 26, and a large diameter portion 22b of the eccentric portion 22 of the drive shaft 23 is rotatably fitted in the opening 26b through the oil seal 7. An oil seal 6 is provided on the eccentric portion 22. Therefore, the oil seals 6 and 7 prevent the grease from leaking from the bearing 19.

As shown in FIG. 3, elongated holes 26c, 26
The number of c, 27c, and 27c is not limited to two, and may be one or three or more. Further, the bearing cover (bearing holding member) 26, 27 has an outer peripheral surface 36c of the crank housing (bearing accommodating portion) 36 or an outer peripheral surface 1 of the cylindrical space (bearing accommodating portion) 11m of the orbiting scroll 11.
A cylindrical member facing 1r may be provided, an elongated hole may be provided in the cylindrical member, and the bearing cover may be fixed to the outer peripheral surface of the bearing housing through the elongated hole.

Balance weights 28 and 29 are provided on both sides of the drive shaft 23 with the eccentric portion 22 of the crankshaft interposed therebetween.

Since the drive shaft 23 is constructed as described above, the drive shaft 23 applies a drive force to the orbiting scroll 11, and the eccentric portion 2 is eccentric from the rotation center axis of the drive shaft 23.
The function of 2 is to prevent the orbiting scroll from rotating.

The drive shaft 23 is the crank housing 3
6, the crankshaft pulley 30A and the drive pulley 31 are fixed side by side. A driving force is transmitted to the driving pulley 31 from a driving source motor (not shown) via a belt, and the driving force is transmitted by the timing belt 15 via the crankshaft pulley 30A to the other two crankshaft pulleys 30B and 30C (not shown). The driving force can be transmitted to the. Further, a tension adjusting pulley 33 (FIG. 1) for adjusting the tension of the towing belt 15 on the fixed scroll housing 3 is provided between the crankshaft pulleys 30B and 30C.
However, the mounting position is adjustable in the vertical direction.

Further, as shown in FIG. 1, in the intermediate scroll housing 34, a suction port fitting 35 having a suction port 32 for the fluid to be compressed is arranged on the upper surface of the scroll compressor body 1, and the suction fluid to be compressed is It is taken in in a direction intersecting with the extending direction of the cooling passage 11n.

Further, as shown in FIG. 1, a plurality of drive shafts 23 for orbiting the orbiting scroll and preventing rotation are provided on the outer peripheral side, and bearings 19 of the drive shaft 23 and the cooling fin 1 are provided.
A space 11e is provided between the cooling air 1a and 1a.

According to this structure, the orbiting scroll 1 is provided between the bearing 19 of the drive shaft and the cooling fin 11a.
In the bearing 19 portion of No. 1, the fin 11a and the end plates 11f, 11
The thickness is set so that the thickness does not change so much as g, sink marks and distortion due to die casting are prevented, and the yield is improved by facilitating manufacturing. Then, the weight of the orbiting scroll 11 can be reduced. Further, in order to improve the heat transfer performance by forming the cooling fins in a corrugated shape and further colliding with the cooling air, the orbiting scroll is divided into two members, manufactured, and then both are united. It can be manufactured.

Further, an adjusting pulley 33 for adjusting the tension of the timing belt 15 is arranged at the center of gravity between the two drive shafts of the crankshaft pulleys 30B, 30C, and further, a suction port for sucking the compressed fluid. The metal fitting 35 is provided on the upper surface of the scroll compressor body 1 at the center of gravity. And
Since the tension of the timing belt 15 can be adjusted by the adjusting pulley 33 for adjusting the tension of the timing belt 15, the manufacturing error of the members at the time of assembly is eliminated by the adjustment, and the maintenance is performed to make the durability of the timing belt 15. The property is improved.

Scroll body 1 configured in this way
As shown in FIG. 1, the rotation of the rotary drive shaft 23 causes
When the eccentric portion 22 of the crankshaft rotates about the drive shaft, the orbiting scroll 11 revolves, and the fluid sucked from the suction port 2a of the fixed scroll housing 2 is taken in by the wrap 10 of the orbiting scroll and fixed to this wrap. It is taken into the enclosed space formed by the scroll wrap 9. Then, this closed space is sequentially compressed and sent to the central portion, exits the discharge port 2d, and is discharged from the pipe 8.

The fluid sucked from the suction port 3a of the fixed scroll housing 3 is the wrap 4 of the orbiting scroll.
0, and is taken into the enclosed space formed by this wrap and the fixed scroll wrap 5.
Then, this closed space is sequentially compressed and sent to the central portion, exits the discharge port 3d and is discharged from the pipe 18.

As described above, in the present embodiment, at least the rolling bearing is accommodated in the bearing accommodating portion having the U-shaped cross section, and at least the rolling bearing is accommodated by the bearing holding member screwed into the screw portion. Since the outer ring can be held in position, the rolling bearing is fixed and held in the bearing housing by adjusting the screwing of the bearing holding member, and even if stress is applied to the rolling bearing in the axial direction, the rolling bearing in the bearing housing is Prevents rocking and reduces the generation of stress in the axial direction, even if load bearing stress is applied to the bearing due to changes in the number of rotations of the motor, shaft shake due to machining accuracy of the crankshaft, start and stop of operation of fluid machinery, etc. If the direction of the load stress intersects the threading direction of the bearing holding member, the outer periphery of the bearing holding member is fitted by the threaded portion, resulting in a strong holding force.
It is possible to prevent the bearing holding member from floating in that direction, and prevent the bearing holding member from colliding with another member to damage the bearing holding member and damage the scroll mechanism. Therefore, it is effective when used in a large-capacity scroll compressor.

In addition to the present embodiment shown in FIG. 1, for example, the fixed scroll plate has an opening at the center thereof, and the drive crankshaft is provided through the opening, and the drive crankshaft It is also applicable to the type in which the eccentric part is connected to the center part of the orbiting scroll plate and the orbital driving force is obtained from the center part of the scroll plate, and not only the double wrap type but also the single wrap type is applicable. is there.

[0048]

As described above, according to the present invention, since the outer periphery of the bearing holding member is fitted by the screw portion,
The rolling bearing is fixed and held in the bearing housing by adjusting the screwing of the bearing holding member, creating a strong holding force, and the rolling bearing swings in the bearing housing even if stress is applied to the rolling bearing in the axial direction. Therefore, the bearing holding member can be prevented from floating, and the bearing holding member can be prevented from colliding with other members to damage the bearing holding member and prevent the scroll mechanism from being damaged.

[Brief description of drawings]

FIG. 1 is a sectional view of a scroll fluid machine according to an embodiment of the present invention.

FIG. 2 is a partially enlarged view of portion B of FIG.

3 is a sectional view taken along line CC of FIG. 2 and a sectional view taken along line DD of FIG.

FIG. 4 is an explanatory diagram of an orbiting scroll drive shaft portion according to a conventional technique.

5 is a cross-sectional view taken along line EE of FIG.

[Explanation of symbols]

11 orbiting scroll 11b screw part 11m bearing storage 19, 20 Rolling bearing 22 Eccentric part (crank part) 26, 27 Bearing cover (bearing holding member) 36a Bearing housing 36a screw part

Front page continuation (51) Int.Cl. ⁷ Identification code FI theme code (reference) F16C 3/08 F16C 3/08 9/02 9/02 F term (reference) 3H029 AA02 AA17 BB32 BB44 CC17 3H039 AA02 BB05 BB08 CC17 CC19 3J017 AA01 AA03 AA05 CA01 CA07 DA01 DB01 3J033 AA02 AA05 FA01 GA08 GA12

Claims (4)

[Claims] 1. A crank portion of a crankshaft, which is rotatably supported on a fixed scroll side via a first rolling bearing, is fitted to the orbiting scroll side via a second rolling bearing, and the crankshaft is fitted. In a scroll fluid machine that imparts a swirling force to the orbiting scroll side by the rotation of, a bearing accommodating portion having one side opening is provided on the at least one scroll side, and a rolling bearing is accommodated in the bearing accommodating portion, and the bearing accommodating portion is accommodated. A threaded portion is threaded on the opening peripheral surface of the portion, and the bearing holding member screwed into the threaded portion
A scroll fluid machine characterized in that at least an outer ring of the rolling bearing can be held in position. 2. The scroll fluid machine according to claim 1, wherein an inner ring side of the rolling bearing is held by a stepped surface of a crankshaft or another fixing member. 3. The bearing holding member is provided with a flat plate or a cylindrical member facing the outer surface or the outer peripheral surface of the bearing accommodating portion, and the flat plate or the cylindrical member is provided with an elongated hole extending in the rotational direction, The scroll fluid machine according to claim 1, wherein the scroll fluid machine is fixed by a screw member screwed to the bearing housing portion side through an elongated hole so that a screwing position can be adjusted. 4. The drive crankshaft, wherein the crankshaft is driven by receiving a rotational force from a motor, and the bearing holding member is located on an outer surface of a fixed scroll side on the motor drive shaft side. Item 1. A scroll fluid machine according to Item 1.