JP2002180977A - Scroll fluid machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent axial displacement or deformation of a turning scroll in a scroll fluid machine fitting fixed laps in fixed scrolls and a turning lap in a turning scroll into engaging states and providing a pin-ring groove type turning scroll self-rotation preventing mechanism. SOLUTION: At least, either one of ring grooves 26 and 36, where lock pins 46 and 47 provided either one of the fixed scrolls 20 and 30 or the turning scroll 40 can be engaged with the tips of the lock pins 46 or 47 provided in the other, is set to elastically and axially movable and deformable.

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 such as a scroll compressor, a scroll vacuum pump, a scroll expander, a scroll blower, and the like. The present invention relates to a device provided via a rotation prevention mechanism of a type.

[0002]

2. Description of the Related Art A rotation preventing mechanism in a scroll fluid machine includes a pin crank type and a pin / ring groove type.

[0003] The present invention relates to a scroll fluid machine having a pin / ring groove type rotation preventing mechanism,
Such a scroll fluid machine itself is known to those skilled in the art.
This will be described with reference to Japanese Patent Publication No. 203801. In the following description, the reference numerals assigned to the respective elements are those obtained by adding 0 before those given in the above publication.

A shaft (02) provided at the center of the orbiting scroll (01) in an eccentric cylinder integral with the drive shaft (013).
The movable scroll (01) is pivotally supported via a needle bearing (015) and is provided in a plurality of ring-shaped grooves (09) provided near the outer periphery of a side plate (end plate) (08a) of the fixed scroll (08). Of the substrate (end plate) (01a) pivotally supported via a bearing (04),
The tip of a locking pin (010) parallel to the drive shaft (013) is slidably fitted.

[0005] The radius of the ring groove (09) depends on the drive shaft.
It is equal to the amount of eccentricity (e) between the central axis of (013) and the central axis of the shaft (02).

When the drive shaft (013) is rotated, the shaft (02) of the orbiting scroll (01) swings in a orbital circle having the radius of the eccentricity (e). The pivot pin (010) is a fixed scroll (08)
The movable scroll (01) revolves on the orbit circle having the radius of the eccentricity (e) without rotating, because it can move only in the ring-shaped groove (09) provided in the side plate (08a).

[0007] Such a pin-ring groove type rotation preventing mechanism requires less number of bearings and locking pins than the pin-crank type, so that the turning weight can be reduced and the driving force can be reduced. Since the force can be reduced, the structure is simplified, and the number of parts is small, so that there is an advantage that it can be manufactured at low cost.

[0008]

However, a scroll fluid machine having a pin / ring groove type rotation preventing mechanism has the following problems.

(A) In a single wrap type scroll fluid machine provided with one fixed scroll and orbiting scroll, the pressure in the closed chamber formed by the fixed wrap in the fixed scroll and the orbiting wrap in the orbiting scroll is: When the pressure rises above a certain limit for some reason and abnormal pressure in the axial direction acts on the orbiting scroll, the outer peripheral portion of the end plate of the orbiting scroll is bent or inclined, and comes into contact with the fixed wrap of the fixed scroll. Therefore, an abnormal sound is generated or galling occurs, and the driving efficiency is reduced. Further, the whole orbiting scroll moves in the axial direction, and the load of the bearing on the orbiting scroll becomes large, the temperature rises, the supplied lubricating grease and the like deteriorate, and finally this bearing is damaged. May be reached.

(B) In a double-wrap type scroll fluid machine in which an orbiting scroll is provided between two opposing fixed scrolls, a sealing error on both sides of the orbiting scroll due to processing errors and assembly errors of related members and respective parts. Due to a slight pressure difference in the chamber, the orbiting scrolls
The fixed scrolls may be slightly displaced from the axial center. For this reason, the turning wrap comes into contact with the fixed wrap, the bearings of each part are abnormally worn or overheated, and the operation is not smooth or the power loss is large.

(C) Similarly, in a double wrap type, for example, when one closed chamber is a low pressure chamber and the other closed chamber is a high pressure chamber, a large axial thrust normally acts on the orbiting scroll. Therefore, the above-mentioned problem becomes more remarkable.

(D) In a scroll fluid machine in which a tip seal is mounted on the tip surface of a fixed wrap and / or a revolving wrap, the tip seal of the tip of the wrap of one of the scrolls is opposed by the thrust in the axial direction of the revolving scroll. The pressing force against the end plate of the scroll may be excessively large or small. If the pressing force is excessive, the sliding resistance increases, driving force is wasted, and the tip seal is overheated to accelerate its wear, thereby impairing the sealing function. If so, a stable sealing effect cannot be obtained, and it goes without saying that the performance as a scroll fluid machine is reduced.

[0013]

SUMMARY OF THE INVENTION An object of the present invention is to solve the above-mentioned problems in a scroll fluid machine having a pin / ring groove type rotation preventing mechanism. It is on the street. (1) A closed chamber is formed between the two wraps by engaging the orbiting wrap of the orbiting scroll pivotally supported by the eccentric portion of the main shaft with the fixed wrap of the fixed scroll, and the orbiting scroll rotates on its own axis. In order to prevent this, a locking pin protruding from one of the orbiting scroll and the fixed scroll toward the other is also provided on the other, to a ring groove having a radius equal to the amount of eccentricity of the eccentric portion with respect to the main shaft. In a scroll fluid machine provided with a pin / ring groove type anti-rotation mechanism provided by locking, at least one of the ring groove or the locking pin,
It can be elastically moved or deformed in the axial direction of the main shaft.

(2) In the above item (1), a part which is elastically movable or deformable in the axial direction of the main shaft is provided in a part of any of the scrolls, and a ring groove is formed in this part.

(3) In the above item (1) or (2), a part of one of the scrolls is provided with a portion which can be elastically moved or deformed in the axial direction of the main shaft, and a locking pin is provided on this portion. Is provided.

(4) In any one of the above items (1) to (3), the ring groove is fitted into a holding hole provided in any of the scrolls so that the ring groove can be elastically moved or deformed in the axial direction. It is formed on the surface of the combined guide plug.

(5) In the above item (4), by providing a cushioning elastic body behind the guide plug, the guide plug can be elastically moved in the axial direction.

(6) In the above item (4) or (5), the whole or a part of the guide plug is made of a material which can be elastically deformed in the axial direction.

(7) In any one of the above items (4) to (6), an adjusting means for changing the axial position of the guide plug is provided.

(8) In any one of the above items (1) to (7), by providing a cushioning elastic body behind the locking pin,
The locking pin can be elastically moved in the axial direction.

(9) In any one of the above items (1) to (8), the whole or a part of the locking pin is elastically deformable in the axial direction.

(10) In any one of the above items (1) to (9), the mutual contact portion between the locking pin and the ring groove is made of a self-lubricating resin.

(11) In any one of the above (1) to (10),
In the double wrap type, the elastic force in one axial direction of one set of the locking pin and the ring groove engaged with the locking pin is different from that of the other set.

[0024]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, an example in which the present invention is applied to a scroll compressor which is an example of a double wrap type scroll fluid machine will be described with reference to FIG. It will be apparent to those skilled in the art that the present invention is equally applicable to any type of pin-ring groove type scroll fluid machine including the single wrap type.

A main shaft (5) having an eccentric part (4) in the center is inserted through the housing cover plate (2) and the housing (3) opposed to each other and fastened with bolts (1). Spindle
The left end of (5) is pivotally supported by a housing cover plate (2) via a needle bearing (6), and the right end of the main shaft (5) is connected to the housing (3) via a ball bearing (7). It is pivoted.

The amount of eccentricity of the eccentric portion (4) with respect to the main shaft (5) is (e). The housing cover plate (2) is integral with the fixed end plate (21) of the left fixed scroll (20),
(3) is integral with the fixed end plate (31) of the fixed scroll (30) on the right side, and the opposing surfaces of both fixed end plates (21) and (31) are each provided with a circular or involute-shaped fixed wrap ( 22) (3
2) protrudes toward the axial direction.

The fixing wraps (22) and (32) have fitting grooves
(23) and (33) are provided, and chip seals (24) and (34) are fitted and fixed in the respective fitting grooves (23) and (33).

Each fixed wrap including tip seals (24) and (34)
The heights in the axial direction of (22) and (32) are determined so as to be able to slide properly on the later-described orbiting end plate of the orbiting scroll.

On the outer peripheral portion of the facing surface of each of the fixed end plates (21) and (31), three bottomed holding holes (25) and (35) oriented in the axial direction are provided at equal angular intervals. In the holding holes (25) (35),
A circular guide plug (2) in which ring grooves (26) (36) having a radius equal to the eccentric amount (e) of the eccentric portion (4) are engraved on the opposing surface.
7) (37) is an annular leaf spring, disc spring, coil spring, rubber lump,
They are fitted so as to be slidable in the axial direction via cushioning elastic bodies (28) and (38) made of plastic lump or sealed air or the like.

The holding holes (25) (35) and the guide plugs (27) (3
The number of 8) and the like is not limited to three and may be two or more.

An eccentric portion (4) of the main shaft (5) is provided with a revolving end plate (41) of a revolving scroll (40) which is correctly positioned between the left and right fixed scrolls (20) and (30).
It is inserted through (8).

On both surfaces of the swivel end plate (41), a circular or involute swivel wrap (42) is protruded in the axial direction, and a fitting groove (43) engraved on the end face thereof is provided. The tip seal (44) is fitted and fixed.

The fixed wraps (22) and (32) and the swivel wrap (42)
Are closed to each other in such a manner that they are engaged with each other so as to gradually decrease in the centripetal direction. In this case, it is needless to say that the tip seal (44) of the orbiting scroll (40) is appropriately slidably in contact with the fixed end plates (21) and (31) of the fixed scrolls (20) and (30).

Three support rods (45) projecting radially at equal angular intervals are integrally formed on the outer peripheral end of the orbiting end plate (41) of the orbiting scroll (40). The boss (48) which is provided with locking pins (46) (47) on the both sides which are oriented in the axial direction and whose ends can be slidably fitted into the ring grooves (26) (36).
Are fitted and fixed.

The guide plugs (27) and (37) and the pins (46) and (47) fitted in the ring grooves (26) and (36) form a rotation preventing mechanism.

When the orbiting scroll (40) is displaced or deformed to the side due to any cause, the above-described anti-rotation mechanism is provided with the locking pin (46) attached to the orbiting scroll (40) or ( The ring groove (26) or (36) is formed and is pushed back by the guide plug (27) or (37) provided with elastic force.

In other words, the basic technical idea of the present invention is that when the orbiting scroll is displaced or deformed in the axial direction, the orbiting scroll is elastically pushed back. In order to achieve
The present invention can be modified as follows.

(A) The locking pin is provided on the fixed scroll side, and the ring groove is provided on the orbiting scroll side. More specifically, as shown in FIG. 2, for example, a plurality of holding holes (25) provided at appropriate positions on the opposing surfaces of the fixed end plates (21) (31) of the fixed scrolls (20) (30).
In (35), guide plugs (27) and (37) each having locking pins (46) and (47) on the inner surface are slid in the axial direction via cushioning elastic bodies (28) and (38). Ring groove (26) having the same radius as the eccentric chamber of the amount of eccentricity of the main shaft provided on both sides of the corresponding portion of the outer peripheral portion of the revolving end plate (41) of the revolving scroll (40). At 36), the tips of the locking pins (46) and (47) are fitted and locked, respectively.

(B) The whole or a part of the guide plug is made of a material which can be elastically deformed in the axial direction. With this, the buffer elastic body provided between the bottom of the holding hole and the guide plug has a small degree of expansion or contraction,
Or it can be omitted altogether.

(C) A portion made of a material that can be elastically deformed in the axial direction is provided in a part of one of the scrolls.
A ring groove is provided in this portion. For example, as shown in FIG. 3, a holding hole (35) provided at a key point of a fixed end plate (31) of a fixed scroll is made of a hard synthetic resin or the like which can be elastically deformed in the axial direction, and a ring is formed on the inner surface. Plug with engraved groove (50)
(51) is firmly fitted.

(D) A part of one of the scrolls is provided with a portion which can be elastically deformed in the axial direction, and a locking pin is provided in this portion. For example, as shown in FIG. 4, a support rod (45) provided at a key point on the outer periphery of the orbiting end plate (41) of the orbiting scroll is covered and fixed with a socket (52) made of an elastically deformable hard synthetic resin or the like. A lock pin that points in the axial direction
Secure the base of (53).

(E) The position of the guide plug can be changed in the axial direction by adjusting bolts or the like.

FIG. 5 shows this example, in which, for example, a pressing plate (54) is provided at the bottom of the holding hole (35) in FIG.
An adjusting bolt (56) is screwed into an axial screw hole (55) drilled from the outer surface of (30) toward the center of the bottom of the holding hole (35).

(F) A cushioning elastic body is provided behind the locking pin. FIG. 6 shows this example, in which an annular groove (57) is provided on the outer surface of a support rod (45) provided at a key point on the outer periphery of the revolving end plate (41), and an annular groove (58) coinciding with the annular groove (57). ) On the inner surface and the annular groove (5
From the point of 8), a supporting hole (59) with a smaller diameter than the width is drilled, and a slightly larger locking flange (60) is provided at the base end of the supporting hole (59). Inserting a locking pin (61) having from the inside, the locking flange (60) is locked in the annular groove (58) at the inner end of the support hole (59), and further, in the annular groove (58), The cylinder (63) in which the cushioning elastic body (62) whose inner peripheral portion projects inward is fitted to the support rod (45).
So that the cushioning elastic body (62) is filled over the inner and outer annular grooves (57) and (58) that match each other.

(G) The locking pin itself can be elastically deformed in the axial direction. FIG. 7 shows an example in which a locking pin (64) is connected to a socket (65) via a compression spring or other appropriate cushioning elastic body (66).
(67).

(H) The mutual contact portion between the locking pin and the ring groove is made of a self-lubricating resin. It may be covered with a self-lubricating resin.

(I) In the double-wrap type, one of the combinations of the locking pin and the ring groove has a different axial elastic force from the other. For this,
I will elaborate later.

A suction hole (9) is provided in the side body of the housing (3).
However, the fixed end plate (31) is also provided with a radial discharge hole (10) for communicating the center of the closed chamber with the outside air.

[0049] Housing cover plate (2) and housing (3)
Cooling fans (11) and (12) are attached to the main shaft (5) so as to be able to rotate integrally with the main shaft (5) in the vicinity of the outside of the main shaft (5) to achieve cooling.

When the main shaft (5) is rotated by an appropriate driving means (not shown), the turning of the orbiting scroll (40) causes
The gas is sucked through the suction hole (9), and moves toward the center while being compressed in the closed chamber formed by the fixed wraps (22) and (32) and the revolving wrap (42) meshing with each other.
Is discharged in the same manner as a normal scroll compressor.

Next, the operation will be described. If a force that tries to displace or deform in the axial direction acts on the orbiting scroll due to poor pressure balance in the closed chamber on the left and right sides of the orbiting scroll, or uneven frictional force of each part, this force is applied to the locking pin and the ring. The orbiting scroll is received and pushed back by the bottom of the groove, and the orbiting scroll is always held at a normal position.

As mentioned above, it is clear that the present invention is equally applicable to any kind of scroll fluid machine of the pin-ring groove type, but some examples are shown in the figures just in case. I'll give it.

FIG. 8 shows an example in which the present invention is applied to a single wrap type scroll compressor.

The fixed wrap (2) of one fixed scroll (20)
2) and the orbiting wrap (42) of one orbiting scroll (40),
Suction fittings (9) near the outer periphery
Thus, the fact that the closed chambers having the smaller capacity are formed sequentially toward the discharge hole (10) at the center does not differ from the normal one.

On the opposite side of the orbiting wrap (42), near the outer periphery of the orbiting scroll (40), there are provided a plurality (usually three) of cylindrical holes (70) oriented in the axial direction of the main shaft (5). In the hole (70), the enlarged head (7) integrated with the locking pin (46) facing in the axial direction
1) is fixed.

The housing (3) covering the orbiting scroll (40)
An axial holding hole (25) is provided at a position corresponding to the cylindrical hole (70) in the vicinity of the outer circumference of the ring hole, and a ring groove (26) is formed in the inner surface thereof through a cushioning elastic body (28). Guide plug with (27)
Are slidably fitted in the axial direction.

Also in this case, the orbiting scroll (40)
It is clear that the shock or the like accompanying the axial displacement or deformation of the above is absorbed by the elastically sliding guide plug (27).

FIG. 9 shows an example in which the present invention is applied to a double wrap type scroll compressor in which the pressures on both sides of the orbiting scroll are inevitably different with the operation.

The basic structure is basically the same as that shown in FIG. 1, but in the case shown in FIG. 9, suction is performed through a suction hole (80) provided near the outer periphery of the left fixed scroll (20). The compressed gas is guided to the center while being compressed on the left side of the orbiting end plate (41) of the orbiting scroll (40), passes through a communication hole (81) formed in the orbiting end plate (41), and passes through the orbiting end plate ( After being guided to the vicinity of the outer periphery of the compression chamber on the right side of 41), and guided to the center thereof while being compressed again, a radially oriented discharge hole (drilled in the fixed end plate (31) of the fixed scroll (30) on the right side ( 82), the ink is discharged from the inner end toward the outer periphery.

In this case, since the pressure on the right side of the orbiting scroll (40) is larger than that on the left side, a thrust force constantly pointing leftward acts on the orbiting scroll (40).

For this reason, the left one of the guide plugs (27) and (37) with which the locking pins (46) and (47) provided on the left and right of the outer peripheral portion of the orbiting scroll (40) are engaged, respectively. Since a large load is applied to the guide plug (27), the elasticity of the cushioning elastic body (28) for elastically supporting the guide plug (27) is set to be larger than that of the right one (38).

As described above, by providing an appropriate difference between the strengths of the left and right cushioning elastic bodies (28) and (38), the orbiting scroll can move in one direction due to the left and right pressure difference accompanying the operation. Deflection is prevented, and smooth and light operation can be performed.

[0063]

According to the first aspect of the present invention, when the orbiting scroll attempts to displace in the axial direction, an elastic resistance is applied as a reaction, so that the orbiting scroll is prevented from being displaced.

According to the second and third aspects of the present invention, the structure for applying the elastic force in the axial direction to the ring groove or the locking pin is simplified.

According to the fourth aspect of the present invention, by selecting the material and the like of the guide plug, it is possible to prevent the ring groove from being worn or deformed unnecessarily, and to be worn or deformed by any chance. In such a case, the guide plug can be easily replaced.

According to the fifth aspect of the present invention, even if the guide plug is made of a hard material having wear resistance, it is possible to appropriately receive the thrust in the axial direction.

The invention according to claim 6: It is not necessary to provide a cushioning elastic body behind the guide plug, and the structure is simplified.

According to a seventh aspect of the present invention, the elastic receiving force of the ring groove can be adjusted as desired.

According to the eighth aspect of the present invention, it is not necessary to give special consideration to a member or a portion provided with a ring groove, so that the structure is simplified.

According to the ninth aspect of the present invention, since the ring groove can be fixed in the axial direction, the structure is simplified.

The tenth aspect of the invention: The operation is light and smooth, and the wear resistance is increased.

According to the eleventh aspect of the present invention, in the scroll fluid machine of the double wrap type, a pressure difference is generated on each side of the orbiting scroll, and a thrust in a constant direction acts on the orbiting scroll in a normal state, so that the operating resistance is reduced. May be increased and the operation may be not smooth, but such a fear is eliminated.

[Brief description of the drawings]

FIG. 1 is a vertical sectional side view showing an example in which a scroll compressor of the present invention is embodied as a double wrap type scroll compressor having orbiting wraps provided on both sides of an orbiting scroll.

FIG. 2 is an enlarged vertical sectional side view of a main part showing an example in which a locking pin is provided on a fixed scroll side and a ring groove is provided on a revolving scroll side.

FIG. 3 is an enlarged vertical sectional side view of an essential part showing an example in which a portion made of a material that can be elastically deformed in the axial direction is provided on a fixed scroll and a ring groove is provided in this portion.

FIG. 4 is an enlarged vertical cross-sectional side view of a main part showing an example in which an orbiting scroll is provided with an elastically deformable portion in the axial direction and a locking pin is provided in this portion.

FIG. 5 is an enlarged vertical sectional side view of a main part showing an example in which the position of the guide plug in the axial direction is changed by an adjustment bolt.

FIG. 6 is an enlarged vertical sectional side view of a main part showing an example in which a cushioning elastic body is provided behind a locking pin.

FIG. 7 is an enlarged vertical sectional side view of a main part showing an example in which the locking pin itself is deformable in the axial direction.

FIG. 8 is a vertical sectional side view showing an example in which the present invention is applied to a single wrap type scroll compressor.

FIG. 9 is a vertical sectional side view showing an example in which the present invention is applied to a double wrap type scroll compressor of a type in which a pressure difference is generated on both surfaces of an orbiting scroll with operation.

[Explanation of symbols]

 (1) Bolt (2) Housing cover plate (3) Housing (4) Eccentric part (5) Main shaft (6) Needle bearing (7) Ball bearing (8) Needle bearing (9) Suction hole (10) Discharge hole (11) ) (12) Cooling fan (20) Fixed scroll (21) Fixed end plate (22) Fixed wrap (23) Fitting groove (24) Tip seal (25) Holding hole (26) Ring groove (27) Guide plug (28) (30) Fixed scroll (31) Fixed end plate (32) Fixed wrap (33) Fitting groove (34) Tip seal (35) Holding hole (36) Ring groove (37) Guide plug (38) Buffer elastic (40) Orbiting scroll (41) Orbiting end plate (42) Orbiting wrap (43) Fitting groove (44) Tip seal (45) Support rod (46) (47) Locking pin (48) Boss (50) Ring groove ( 51) Plug (52) Socket (53) Locking pin (54) Press plate (55) Screw hole (56) Adjusting bolt (57) (58) Ring groove (59) Support hole (60) Locking flange (61) Locking pin (62) Elastic locking body (63) Support tube (64) Locking pin (65) Socket (66) Shock absorber (67) Sliding pin (70) Cylinder hole (71) Expanding head (80) Suction hole (81) Communication hole (82) Discharge hole

Claims (11)

[Claims] An orbiting wrap of a revolving scroll pivotally supported on an eccentric portion of a main shaft and a fixed wrap of a fixed scroll are engaged with each other to form a sealed chamber between the two wraps, and the orbiting scroll is formed. A ring having a radius equal to the amount of eccentricity of the eccentric portion with respect to the main shaft is provided on the other of the locking pins projecting toward the other from one of the orbiting scroll and the fixed scroll in order to prevent the rotation of the eccentric portion. In a scroll fluid machine provided with a pin / ring groove type anti-rotation mechanism locked in a groove, at least one of the ring groove and the locking pin can be elastically moved or deformed in the axial direction of the main shaft. A scroll fluid machine characterized by the following. 2. The scroll according to claim 1, wherein a part of any one of the scrolls is provided with a part that can be elastically moved or deformed in the axial direction of the main shaft, and a ring groove is formed in this part. Fluid machinery. 3. A part of one of the scrolls is provided with a part which can be elastically moved or deformed in the axial direction of the main shaft, and a locking pin is provided in this part. The scroll fluid machine of any of the preceding claims. 4. The guide plug according to claim 1, wherein the ring groove is formed on a surface of a guide plug fitted into one of the holding holes provided in one of the scrolls so as to be elastically movable or deformable in the axial direction. Item 4. A scroll fluid machine according to any one of Items 1 to 3. 5. The scroll fluid machine according to claim 4, wherein a buffer elastic body is provided behind the guide plug so that the guide plug can be elastically moved in the axial direction. 6. The scroll fluid machine according to claim 4, wherein a whole or a part of the guide plug is made of a material that can be elastically deformed in an axial direction. 7. An adjusting means for changing the position of the guide plug in the axial direction is provided.
7. The scroll fluid machine according to any one of claims 6 to 6. 8. The locking pin according to claim 1, wherein a cushioning elastic body is provided behind the locking pin so that the locking pin can be elastically moved in the axial direction. The scroll fluid machine of any of the preceding claims. 9. The scroll fluid machine according to claim 1, wherein the whole or a part of the locking pin is elastically deformable in the axial direction. 10. The scroll fluid machine according to claim 1, wherein a mutual contact portion between the locking pin and the ring groove is made of a self-lubricating resin. 11. In a double wrap type,
The elastic force in one axial direction of a set of a locking pin and a ring groove engaged with the locking pin is different from that of the other set. Scroll fluid machinery.