JPH09126159A - Scroll type fluid device and manufacturing method thereof - Google Patents

Abstract

(57) 【Abstract】 PROBLEM TO BE SOLVED:
The processing accuracy of each wrap of the inner scroll is improved, and the efficiency of the compressor is improved. SOLUTION: An end plate (10a, 11a) having a center hole in the center
Between the pair of fixed scrolls (10,11) with the wraps (10b, 11b) standing on the front of the, there is a central hole (12c) in the center,
A pair of wraps (13b, 14) that mesh with the wraps (10b, 11b) of each fixed scroll (10, 11) to form working chambers (15, 16).
For the shaft penetration type double-toothed scroll compressor in which the orbiting scroll (12) with b) is arranged, the orbiting scroll (12)
Is divided into upper and lower parts, between the upper fixed scroll (10) and the upper orbiting scroll (13) and the lower fixed scroll (11).
And the orbiting scroll (14) on the lower side, respectively.
6) is formed. Each orbiting scroll (13, 14) was made individually, and the center hole (12c) and lap (13b, 14b) were made at the time of making each
And are processed at the same time.

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, and more particularly, to an inner scroll in which wraps are erected on both sides of an end plate between a pair of outer scrolls in which wraps are erected on the front surface of the end plate. The present invention relates to a measure for improving the processing accuracy of the inner scroll in a so-called double-toothed scroll type fluid device in which the working chamber is formed by the meshing of the wraps.

[0002]

2. Description of the Related Art Conventionally, as one type of scroll type fluid device, as disclosed in, for example, Japanese Patent Application Laid-Open No. 7-133770, the load in the thrust direction due to the fluid pressure in the working chamber is canceled out to stabilize. There is known a so-called double-tooth type that is capable of achieving the above compression operation. In this type of scroll type fluid device, a wrap is erected on the front surface of an end plate, and the front surfaces are arranged between a pair of outer scrolls which are arranged to face each other with a predetermined gap therebetween and each outer scroll. And an inner scroll having wraps formed on both sides of the end plate so as to mesh with the wraps of the outer scrolls to form working chambers. Then, by revolving one of the outer scroll and the inner scroll, the working chamber is contracted and the fluid is compressed.

[0003]

By the way, the above-mentioned inner scroll is generally manufactured by cutting with a machining center. Hereafter, the manufacturing process of this inner scroll will be described. As shown in FIG. 5, an inner scroll having a through hole (b) for inserting a drive shaft in the center of an end plate (a) is formed (a so-called shaft-through type scroll type). An orbiting scroll in a fluid device will be described as an example. First, a state where one side (lower side) of the substantially cylindrical material (c) before processing, which is indicated by an imaginary line, is chucked ((d) of FIG. 5 shows a chuck)
Then, wrap (e1) from the side opposite the chucking side (upper side).
And the through hole (b) is cut. At this time, the through hole (b) is formed so as to penetrate from the upper surface to the lower surface of the material (c). Then, this chucking is released, and the wrap (e2) on the opposite side (lower side) is processed by chucking from the side (upper side) on which the lap (e1) is formed.

Due to such a machining operation, the through hole (b) is simultaneously machined during machining of the upper lap (e1) which is previously machined, so that the coordinates initially set in the machining center are deviated. Therefore, the center of the base circle of the wrap (e1) coincides with the center of the through hole (b) without shifting. That is, this lap (e1) is processed with the center of the through hole (b) as a reference point.

However, the lower wrap (e2) that is later processed
When processing, the chucking point for the material (c) is changed, so the center of the base circle of this wrap (e2) and the through hole
It is difficult to match the center of (b). Therefore, it is difficult to set the position of the lower wrap (e2) to the optimum position with the center of the through hole (b) as the reference point. In other words, in this type of inner scroll, each lap (e1, e2) is usually processed with the center of the through hole (b) as the center of the involute base circle, but the lower wrap (e2) is
Since it is not processed at the same time as the through hole (b), it is difficult to perform processing with the center of this through hole (b) as the center of the basic circle, and in the state where the holding accuracy by chucking is not obtained accurately. A processing error will occur in the lower lap (e2). That is, this lower wrap (e2) is replaced with the upper wrap (e1)
It cannot be formed in a position symmetrical with.

In order to perform an efficient compressing operation in this type of scroll type fluid apparatus, each member constituting the apparatus is required to have a high processing accuracy, but as described above, one of the laps is optimal. If it is not formed in the position, the sliding contact state between the wrap of the inner scroll and the wrap of the outer scroll cannot be obtained well, and a gap may occur between these wraps, causing fluid leakage,
The wraps may collide with each other to generate noise, and in some cases, the wraps may be damaged, resulting in a problem.

The present invention has been made in view of this point, and is to improve the machining accuracy of each wrap of the inner scroll and improve the efficiency of the compressor for a double-toothed scroll type fluid device. With the goal.

[0008]

In order to achieve the above object, the present invention makes it possible to process each wrap into an optimum shape by dividing the inner scroll and making each one individually.

Specifically, the invention according to claim 1 is, as shown in FIG. 1, a spiral wrap (10b, 1a) on the front surface of an end plate (10a, 11a).
1b) is erected, and a pair of outer scrolls (10, 1) are arranged with their front faces facing each other with a predetermined gap.
1) and the outer scrolls (10, 11),
An inner scroll (12) having a pair of spiral wraps (13b, 14b) that mesh with the wraps (10b, 11b) of each outer scroll (10, 11) to form working chambers (15, 16), respectively. Equipped with
A scroll type fluid device in which the outer scroll (10, 11) and the inner scroll (12) revolve relative to each other to change the internal volume of the working chamber (15, 16) to compress the fluid. It is assumed. The front side of the end plate (13a) is attached to the outer scroll (1) of the inner scroll (12).
The wrap (13b), which is placed facing the front panel of the end plate (13a), faces the wrap (10) of the outer scroll (10).
The first inner scroll (13) that forms the working chamber (15) with the b) and the front surface of the end plate (14a) are arranged so as to face the other outer scroll (11). The wrap (14b) erected on the front is the wrap of the other outer scroll (11)
A second inner scroll (14) forming the working chamber (16) with the inner scroll (1b).
3, 14), the rear surfaces of the respective end plates (13a, 14a) are arranged so as to overlap each other.

With such a structure, the inner scroll (1
Since it is possible to separately produce the first inner scroll (13) and the second inner scroll (14) that compose 2), the center of the base circle of these wraps (13b, 14b) is specified. The laps (13b, 14b) can be processed with high accuracy by using the reference point (for example, the center of the bearing) as a reference.

According to a second aspect of the present invention, in the scroll type fluid device according to the first aspect, each outer scroll is a fixed scroll (10, 11) and each inner scroll is an orbiting scroll (13, 14). Also, each scroll (10,1
Center holes (10c, 11c), (13c, 14c) are formed in the center of (1), (13, 14), and the orbiting scroll (13) is formed in these center holes (10c, 11c), (13c, 14c). , 14) through which a drive shaft (8) having an eccentric portion (8b) located in a central hole (13c, 14c) is inserted. Then, as the drive shaft (8) rotates, each orbiting scroll (13, 14)
Revolves around each fixed scroll (10, 11).

With this construction, the inner scroll (12) is provided with the first inner scroll (13) and the second inner scroll, especially for a so-called shaft-through type scroll type fluid device in which each scroll is provided with a central hole. By doing with the scroll (14), it is possible to process while setting the center of the basic circle of the wrap (13b, 14b) of each scroll (13, 14) to the center of the center hole (13c, 14c). The processing accuracy of each lap (13b, 14b) is good.

According to a third aspect of the invention, in the scroll type fluid device according to the second aspect, each orbiting scroll (1
3, 14) are arranged between the fixed scrolls (10, 11) in a state where the rotation prevention mechanism (18) prevents rotation.

With this configuration, each orbiting scroll (13, 1
4) revolves while the rotation is prevented by the rotation prevention mechanism (18). That is, the positional deviation of the orbiting scrolls (13, 14) in the circumferential direction is restricted by the rotation preventing mechanism (18). Further, since the internal pressure of each working chamber (15, 16) acts in the direction of pressing the end plates of each orbiting scroll (13, 14) against each other, these orbiting scrolls (13, 14) revolve integrally. As a result, stable compression operation is performed.

According to a fourth aspect of the invention, the central hole (1
(0c, 11c) with a spiral wrap (10b, 11b) standing on the front surface of the end plate (10a, 11a) having a fixed pair of front surfaces facing each other with a predetermined gap It is arranged between the scrolls (10, 11) and the fixed scrolls (10, 11), has a central hole (12c) in the center, and wraps (10b, 11b) of the fixed scrolls (10, 11). ) And a pair of spiral wraps (13) that form respective working chambers (15, 16).
b, 14b) and the orbiting scroll (12), and the center holes (10c, 11c, 12c) of the scrolls (10, 11, 12) are inserted, and the eccentric part (8b) is the center of the orbiting scroll (12). A drive shaft (8) positioned in the hole (12c), and the orbiting scroll (12) revolves with respect to the fixed scroll (10, 11) by the rotation of the drive shaft (8), and thereby the working chamber It is premised on a method of manufacturing a scroll type fluid device in which the internal volume of (15,16) is changed to compress the fluid. And the end plate (1
The front of (3a) is arranged opposite to one fixed scroll (10), and the wrap (13b) standing on the front of this end plate (13a) is between the wrap (10b) of one fixed scroll (10). A first orbiting scroll (13) forming a working chamber (15) and an end plate (1
The front surface of (4a) is arranged to face the other fixed scroll (11), and the wrap (14b) standing on the front surface of this end plate (14a) is placed between the wrap (11b) of the other fixed scroll (11). In producing the orbiting scroll (12) by combining with the second orbiting scroll (14) forming the working chamber (16), the first orbiting scroll (13) and the second orbiting scroll (14) are Separately, the center of the base circle of the lap (13b, 14b) and the center hole (13c, 1b)
Simultaneously processed to make it coincide with the center of 4c),
The back surface of the end plate (13a) of the first orbiting scroll (13) and the back surface of the end plate (14a) of the second orbiting scroll (14) are overlapped with each other to produce the orbiting scroll (12). There is.

Since the orbiting scrolls (13, 14) are individually manufactured for such a so-called shaft-through type scroll type fluid device, the operation according to the above-mentioned claim 2 is achieved. Similarly, it is possible to machine while setting the center of the base circle of the lap (13b, 14b) of each orbiting scroll (13, 14) to the center of the center hole (13c, 14c), and the machining accuracy of each lap (13b, 14b) is improved. It is good.

[0017]

Next, embodiments of the present invention will be described with reference to the drawings. The scroll type fluid device according to the present embodiment is used as a compressor or a vacuum pump for a refrigerator, and compresses and discharges a refrigerant gas.

As shown in FIG. 1, this scroll type fluid device (1) has a closed casing (2), and an upper part inside thereof has a compression mechanism for sucking and compressing and discharging a refrigerant gas. The scroll mechanism (3) and the drive mechanism (4) at the bottom for driving the scroll mechanism (3).
Are housed respectively. In addition, a suction pipe (5) for sucking the refrigerant gas is provided on a side wall of the casing (2) at a position corresponding to the scroll mechanism (3) so as to project laterally. Side wall scroll mechanism (3)
A discharge pipe (6) for discharging the compressed refrigerant gas to the outside is projectingly provided at the lower position.

The drive mechanism (4) comprises an electric motor (7) and a crankshaft (8) connected thereto. The electric motor (7) is composed of a stator (7a) fixed to the inner wall surface of the casing (2) and a rotor (7b) inserted in the stator (7a). The lower part of the crankshaft (8) is inserted in the rotor (7b), and the fuel pump (8a) is installed at the lower end of the crankshaft (8).
Is provided, and the oil supply pump (8a) is immersed in the lubricating oil (O) stored in the oil sump (2a) below the casing (2). The upper part of the crankshaft (8) has a scroll mechanism.
It penetrates through (3) and extends to the vicinity of the upper end of the casing (2). Further, an unillustrated oil supply passage for supplying the lubricating oil pumped up by the oil supply pump (8a) to the scroll mechanism (3) is formed through the crankshaft (8).

The scroll mechanism (3) is provided with a pair of upper and lower fixed scrolls (10, 11) as outer scrolls. Each of the fixed scrolls (10, 11) is integrally fixed to the casing (2), and a part of the outer peripheral surface of the fixed scroll (10, 11) forms a gap with the inner surface of the casing (2), whereby the scroll mechanism ( Spaces (A, B) on the upper and lower sides of 3) communicate with each other. The fixed scroll (10) on the upper side has a spiral shape (involute shape) on the lower surface of the disk-shaped end plate (10a).
The wrap (10b) formed on the bottom is erected. Further, a central hole (10c) for inserting the crankshaft (8) is formed in the center of the end plate (10a) of the upper fixed scroll (10).

The lower fixed scroll (11) is substantially symmetrical to the upper fixed scroll (10) described above. In other words, the wrap (11b) formed in a spiral shape (involute shape) is erected on the upper surface of the disk-shaped end plate (11a). In addition, the end plate (11
A central hole (11c) for inserting the crankshaft (8) is also formed in the center of a). The fixed scrolls (10, 11) formed in this way are arranged so that the wraps (10b, 11b) face each other with a predetermined interval.

The upper and lower fixed scrolls (10, 1
An orbiting scroll (12) as an inner scroll, which is a feature of the present embodiment, is arranged between 1). The orbiting scroll (12) has a pair of upper and lower orbiting scrolls (13, 14) superimposed on each other. Each orbiting scroll (13,
14), the upper orbiting scroll (13) as the first inner scroll is, as shown in FIG. 3, an upper surface of a disk-shaped end plate (13a) (a surface facing the upper fixed scroll (10)). ), A wrap (13b) formed in a spiral shape (involute shape) is provided upright.
wrap (10b) of the upper fixed scroll (10) opposite b)
It is arranged so as to mesh with. Thereby, between the upper fixed scroll (10) and the upper orbiting scroll (13), as shown in FIG. 2, the inner and outer wall surfaces of the wrap (13b) of the upper orbiting scroll (13) are The wrap (10b) of the upper fixed scroll (10) is in contact with the outer and inner wall surfaces of the wrap (10b) at a plurality of locations in the spiral direction, and a working chamber (15) for compressing the refrigerant gas between these contact portions. Are formed.

On the other hand, the lower orbiting scroll (14) as the second inner scroll has a spiral shape (involute) on the lower surface (the surface facing the lower fixed scroll (11)) of the disk-shaped end plate (14a). The wrap (14b) formed in a vertical shape is provided upright, and the wrap (14b) is arranged so as to mesh with the wrap (11b) of the opposed lower fixed scroll (11). As a result, the action chamber (16) for compressing the refrigerant gas is formed between the lower fixed scroll (11) and the lower orbiting scroll (14) in the same manner as described above. In addition, the crankshaft is located at the center of each orbiting scroll (13, 14).
Center holes (12c) for inserting the eccentric parts (8b) of (8) are formed respectively.

The eccentric part (8b) of the crankshaft (8) is
Its axis (P) is slightly eccentric with respect to the axis (Q) of the crankshaft (8). Therefore, when the crankshaft (8) is rotated by the drive of the drive mechanism (4), each orbiting scroll (13, 1
4) revolves around the axis (Q) of the crankshaft (8) to contract the working chambers (15, 16).

Further, each fixed scroll (10, 11) has a discharge passage (10d, 11d) for communicating the working chamber (15, 16) with the internal space (A, B) of the closed casing (2), respectively. Has been formed. Specifically, the discharge passage (10d) formed in the upper fixed scroll (10) has one end in the center of the upper working chamber (15) and the other end inside the casing above the upper fixed scroll (10). Each has an opening in the space (A), and the upper working chamber (1
The refrigerant gas compressed in 5) is discharged into the upper casing inner space (A). The discharge passage (11d) formed in the lower fixed scroll (11) has one end in the center of the lower working chamber (16) and the other end on the lower side of the lower fixed scroll (11). Are opened in the casing inner space (B), and the refrigerant gas compressed in the lower working chamber (16) is discharged to the lower casing inner space (B). In addition, the crankshaft (8) and each scroll (1
0,11,13,14) is supplied with lubricating oil from the oil supply passage.

Further, as shown in FIG. 1, at the upper position of the upper fixed scroll (10) and the lower position of the lower fixed scroll (11) of the crankshaft (8), the crankshaft (when rotating the drive mechanism (4) ( Balance weights (17a, 17b) are provided for canceling the centrifugal force generated by the eccentric part (8b) of 8) and keeping balance.

Further, at a position near the outer peripheral edge of each orbiting scroll (13, 14), an orbital joint composed of an Oldham coupling or the like for preventing the orbiting scroll (13, 14) from rotating and performing a predetermined revolving motion. A prevention member (18) is provided.

Next, the shape of the winding start end portion (center portion of the scroll) of each wrap (10b, 11b, 13b, 14b) of the fixed scroll (10, 11) and the orbiting scroll (13, 14) is shown in FIG. It will be explained based on. Here, the upper fixed scroll (1
0) wrap (10b) and upper orbiting scroll (13) wrap (1
3b), the lower fixed scroll (11) wrap (11b) and the lower orbiting scroll (14) wrap (14b).
Has a similar shape.

At a position displaced by about 320 ° from the winding start end (10f) of the wrap (10b) of the fixed scroll (10) to the outer side in the circumferential direction, it is continuous with the inner peripheral surface of the wrap (10b) and has a substantially semicircular shape. A sliding contact surface (19) is formed by recessing in an arc shape. Further, in the wrap (10b) of the fixed scroll (10), a discharge opening (20) is opened at an inner portion of the sliding contact surface (19) as one end of the discharge passage (10d). The sliding contact surface (19) of the discharge opening (20)
The opening position with respect to is set at the end of the sliding contact surface (19) located on the scroll center side. That is, the discharge opening (20) is opened at the arc end portion of the sliding contact surface (19).

Then, the wrap (13) of the orbiting scroll (13) is
In b), the winding start end (13f) is extended to a position where it is substantially in contact with the sliding contact surface (19). ), The working chamber (15) is prevented from communicating with the discharge opening (20), and the winding start end is accompanied by the orbiting scroll (13).
When (13f) reaches the end of the sliding contact surface (19), the working chamber (15) communicates with the discharge opening (20), and the refrigerant gas in the working chamber (15) discharges the discharge opening (20) and discharge passage. Casing internal space through (10d)
It is designed to be discharged to (A).

Further, the central hole (1
A cylindrical boss (12e) is formed around (3c), and the eccentric part of the crankshaft (8) is inside the boss (12e).
(8b) is inserted. The boss (12e) and the wrap (13b) are connected by a connecting portion (12f) extending in the radial direction of the orbiting scroll (13). The connecting portion (12f) is also formed with a sliding contact surface (21) which is recessed into a substantially semi-circular shape similar to the fixed scroll (10), and the sliding contact surface (21) has a fixed scroll surface. The winding start end (10f) of the wrap (10b) of (10) can contact. Therefore, as the orbiting scroll (13) revolves, the fixed scroll (1
When the tip portion (10f) of the wrap (10b) of (0) is substantially in contact with the sliding contact surface (21), the working chamber (15 ') is prevented from communicating with the discharge opening (20), and the scroll (13' ) Turning chamber
When (15 ') communicates with the discharge opening (20), the refrigerant gas in the working chamber (15') is discharged into the casing internal space (A) through the discharge opening (20) and the discharge passage (10d). It has become. In this manner, the orbiting scroll (13) orbits the action chamber (15, 15 ') to the discharge opening (20) so that the action chamber (15, 15') is divided and opened at two positions. Has become.

Next, the compression operation of the scroll type fluid device (1) constructed as described above will be explained. Electric motor
When (7) is driven, the crank shaft (8) rotates around the shaft center (Q). At this time, the eccentric part (8b) is
It revolves around the axis (Q) of (8). Along with this, the orbiting scrolls (13, 14) through which the eccentric part (8b) is inserted revolve around the fixed scrolls (10, 11). Also,
The rotation preventing member (18) prevents the orbiting scrolls (13, 14) from rotating. This allows the upper orbiting scroll (13)
End plate (13a) and bottom orbiting scroll (14) end plate (14a)
On the lower side, the contact points of the opposing laps (10b, 13b) and (11b, 14b) move toward the center. With this movement, each working chamber (15, 16) is contracted while moving in a spiral shape toward the center. By this series of operations, low-pressure refrigerant gas flows from the suction pipe (5) into the working chamber (15, 16),
It is compressed into high pressure and reaches the center of the working chamber (15,16). At the center of the working chamber (15, 16), the winding start end (13) of the orbiting scroll (13, 14) wrap (13b, 14b) is
f) is turning so as to draw an arcuate trajectory, and this turning action causes the winding start end (13f) of the lap (13b) to slide along the sliding contact surface (19) of the fixed scroll (10). Operation,
The operation of separating from the sliding contact surface (19) is repeated. This allows
When the winding start end (13f) of the wrap (13b) is substantially in contact with the sliding contact surface (19), the working chamber (15) is compressed without communicating with the discharge opening (20), and the scroll ( When the winding start end (13f) of the lap (13b) reaches the end of the sliding contact surface (19) with the turning of (13), the working chamber (15) and the discharge opening (20) communicate with each other and the working chamber (15 Refrigerant gas in 15) is discharged through the discharge opening (20) and discharge passage.
It is discharged into the casing internal space (A) via (10d). In addition, the same operation as this is performed for the sliding contact surface of the orbiting scroll (13).
It is also performed between (21) and the winding start end (10f) of the fixed scroll (10). Such compression and discharge operations are
The high-pressure refrigerant gas discharged into the casing inner space (A, B) at (15, 16) is discharged from the discharge pipe (6) to the outside of the casing.

Next, the manufacturing work of the orbiting scroll (12) and the assembling work of the orbiting scroll (12) to the fixed scrolls (10, 11) will be described. As described above, since the orbiting scroll (12) is composed of the pair of upper and lower orbiting scrolls (13, 14), these are individually manufactured. This fabrication is performed by cutting with a machining center, and is a substantially cylindrical material shown in phantom in FIG.
(C) With one side (lower side of Fig. 4) chucked,
The wrap (13b) and the center hole (13c) are cut from the side opposite the chucking side (upper side). On the other hand, the wrap (14b) and the central hole (14c) are similarly cut on the other orbiting scroll (14). At this time, the wrap shapes of the orbiting scrolls (13, 14) combined with each other are formed symmetrically. And, the orbiting scrolls (13, 14) produced in this way are wrapped (13b, 14b)
Is machined at the same time as the center hole (13c, 14c), the origin set before machining is set as the center of the lap (13b, 14b) (center of the involute base circle) and the center of the center hole (13c, 14c). , The center of the base circle of the laps (13b, 14b) is the center hole (13c, 1b
It coincides with the center of 4c). That is, this lap (13b, 14b)
Will be machined with the center of the center hole (13c, 14c) as the reference point.

Then, as a work for incorporating the orbiting scrolls (13, 14) thus produced between the fixed scrolls (10, 11), first, the upper fixed scroll (10)
Before assembling the lower fixed scroll (11) into the center hole (11
Lower fixed scroll with crankshaft (8) inserted through c)
The lower orbiting scroll (14) and the upper orbiting scroll (13) are placed in order on (11). At this time, the lower orbiting scroll (14) faces the front of the end plate (14a) downward so that the wrap (14b) meshes with the wrap (11b) of the lower fixed scroll (11), while the upper orbiting scroll (14b) faces downward. (13) is an end plate
Turn the front of (13a) upward. In addition, when placing these orbiting scrolls (13, 14), they are rotated by the rotation prevention mechanism (18).
I will link to. After this, the wrap (13b) of the upper orbiting scroll (13) and the wrap (10b) of the upper fixed scroll (10)
The upper fixed scroll (10) is placed from the upper side of the upper orbiting scroll (13) so as to mesh with, and each orbiting scroll is placed between the upper fixed scroll (10) and the lower fixed scroll (11). These fixed scrolls (10, 11) are assembled together with the (13, 14) accommodated. In other words, when these scrolls (10, 11, 13, 14) are assembled, the orbiting scrolls (13, 14) only contact the back surfaces of the end plates (13a, 14a). However, they are not joined together by means such as welding, but their positions are individually regulated only by the rotation preventing mechanism (18). Then, during the compression operation of the device (1), the pressure inside each working chamber (15, 16) becomes high, and this pressure causes the end plates (13a, 14a) of the orbiting scrolls (13, 14) to move.
a) The two orbiting scrolls (13, 14) will not be displaced relative to each other and no gaps will be formed between the end plates (13a, 14a) because they will be pressed against each other. In addition, the orbital movement will be carried out integrally. Therefore, in particular, even if a means for integrally assembling the orbiting scrolls (13, 14) is not required, the revolving motion is the same as that of the conventional orbiting scroll (not divided). In other words, even if the orbiting scroll (12) is divided into upper and lower parts, there is almost no adverse effect on the orbital motion.

As described above, in the present embodiment, the orbiting scrolls (13, 14) are divided into upper and lower halves, each of which is individually manufactured. At the time of this manufacturing, the wraps (13b, 14b) and the central hole (13c) are formed. , 14c) are processed at the same time, so that this lap (13b, 14b) can be processed with the center of the center hole (13c, 14c) as a reference point. That is, each lap (13b, 14
The shape of b) can be processed into an optimum shape with the center of the center hole (13c, 14c) as a reference point. Therefore, when the orbiting scrolls (13, 14) are assembled to the eccentric part (8b) of the crankshaft (8) and positioned by the rotation prevention mechanism (18), the center of each orbiting scroll (13, 14) is The center positions of the holes (13c, 14c) coincide with each other, and the wraps (13b, 14c)
The centers of the basic circles in b) will also coincide with each other. That is, the wraps (13b, 14b) of the upper and lower orbiting scrolls (13, 14)
Are set in an involute shape with the center of the center hole (13c, 14c) as the center of the basic circle, and are assembled so as to be symmetrical to each other.

Therefore, when the orbiting scrolls (13, 14) revolve, the wraps (13, 14) of the orbiting scrolls (13, 14) are rotated.
b, 14b) and each fixed scroll (10, 11) wrap (10b, 11b)
Good sliding contact with the wrap (13b, 10
b), (14b, 11b) creates a gap between them and causes fluid leakage, or laps (13b, 10b), (14b, 11b) collide with each other to generate noise or wrap (13b, 10b, It is possible to improve the efficiency of the compressor, reduce the operating noise, and improve the reliability without damaging 14b, 11b).

In this embodiment, each orbiting scroll (13, 1
4) Although it is assumed that they are not joined to each other, as shown by phantom lines in Fig. 3, each orbiting scroll (13, 14) is pin (2
They may be integrally connected by 2). In other words, by forming pin holes in the orbiting scrolls (13, 14) at the positions where the respective laps (13b, 14b) overlap with each other and inserting the pins (22) into these holes, Are integrally connected.

Further, although each scroll of the present embodiment has an asymmetrical shape in which the outer peripheral ends of the respective wraps are set to substantially coincide with each other, the respective outer peripheral end positions are shifted by 180 ° in the circumferential direction. It is also applicable to some symmetrical scrolls.

Further, in the present embodiment, the shaft penetrating type device in which the eccentric portion of the drive shaft is positioned in the center hole of the orbiting scroll to cause the orbiting scroll to revolve is described, but the present invention is not limited to this. Instead, it may be applied to a device using other mechanism for revolving the orbiting scroll.

Further, in the present embodiment, the inner scroll is the orbiting scroll and the outer scroll is the fixed scroll. On the contrary, the inner scroll is the fixed scroll, and the outer scroll is the orbiting scroll. It may be applied to a scroll type.

[0041]

As described above, according to the present invention, the following effects can be obtained. According to the invention described in claim 1, in the so-called double-tooth type scroll fluid device, the inner scroll is configured such that the back surfaces of the end plates of the first and second inner scrolls are overlapped with each other. Since it is possible to make each inner scroll individually, the center of the basic circle of the wrap of each inner scroll can be made with a predetermined reference point (for example, the center point of the bearing) as a reference, and each wrap is high. It can be processed with precision. Therefore, the slidable contact state between the inner scroll wrap and each outer scroll wrap can be favorably obtained. Therefore, unlike the conventional case, there is no gap between the wraps and fluid leakage occurs, and the laps do not collide with each other to generate noise or damage the wraps, improving the compressor efficiency and operating noise. Can be reduced and reliability can be improved.

According to the second aspect of the invention, in the so-called shaft-through type scroll type fluid device, the inner scroll is formed by the first and second inner scrolls, and therefore the center of the wrapping circle of each scroll is centered. Can be processed individually while setting the center of the center hole of the end plate. Therefore, it is possible to obtain high processing accuracy for each wrap, and it is possible to obtain an inner scroll provided with each wrap having symmetrical shapes without any dimensional error by simply mounting each scroll on the drive shaft.

According to the third aspect of the present invention, since the rotation of each orbiting scroll is prevented by the rotation preventing mechanism,
The positional deviation of each orbiting scroll in the circumferential direction is restricted. Further, the end plates of the orbiting scrolls are pressed against each other by the internal pressure of the working chambers, and the orbiting scrolls revolve integrally. Therefore, a stable revolution movement is performed, and the compressor efficiency can be improved also by this.

According to the invention described in claim 4, since the method for producing each orbiting scroll individually for the so-called shaft-through type scroll fluid device, the effect according to the invention described in claim 2 is provided. Similar to the above, it is possible to process while setting the center circle of the wrap of each scroll to the center of the center hole, and it is possible to ensure good processing accuracy of each lap, which improves compressor efficiency, reduces operating noise, and improves reliability. It is possible to improve the sex.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a shaft penetration type double-tooth scroll compressor according to an embodiment.

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

FIG. 3 is a sectional view showing an orbiting scroll.

FIG. 4 is a cross-sectional view for explaining a working operation of the orbiting scroll.

FIG. 5 is a view corresponding to FIG. 5 showing a conventional orbiting scroll.

[Explanation of symbols]

 (1) Scroll type fluid device (8) Crankshaft (drive shaft) (8b) Eccentric part (10,11) Fixed scroll (outer scroll) (12,13,14) Orbiting scroll (inner scroll) (10a, 11a, 13a, 14a) End plate (10b, 11b, 13b, 14b) Wrap (10c, 11c, 12c, 13c, 14c) Center hole (15, 16) Working chamber (18) Anti-rotation mechanism

Claims (4)

[Claims] 1. A spiral wrap on the front surface of an end plate (10a, 11a).
(10b, 11b) are erected, and a pair of outer scrolls are arranged with their front faces facing each other with a predetermined gap.
(10, 11) and each of the outer scrolls (10, 11) are arranged between the outer scrolls (10, 11) and mesh with the wraps (10b, 11b) of the respective outer scrolls (10, 11), respectively, so that the working chamber (15, 16) To form a pair of spiral wraps (13
b, 14b) and an inner scroll (12) having an inner scroll (12), and the outer scroll (10, 11) and the inner scroll (12) relatively orbit the inner volume of the working chamber (15, 16). In the scroll type fluid device which is changed to compress the fluid, in the inner scroll (12), the front surface of the end plate (13a) is arranged to face one outer scroll (10), and the front surface of the end plate (13a) is arranged. Wrap (13
b) a first inner scroll (13) forming the working chamber (15) with the wrap (10b) of one outer scroll (10)
And the front surface of the end plate (14a) faces the other outer scroll (11), and the wrap (14
b) with a second inner scroll (14) forming the working chamber (16) with the wrap (11b) of the other outer scroll (11), each of these inner scrolls (13, 14) , Each end plate (13a, 1
A scroll type fluid device in which the back surfaces of 4a) are arranged so as to overlap each other. 2. Each outer scroll is a fixed scroll (10,
11) and each inner scroll is an orbiting scroll (13,1
4), the central holes (10c, 11c), (13c, 14c) are formed at the center of each scroll (10, 11), (13, 14), and these central holes (10c, 11c) , (13c, 14c) is the orbiting scroll (13,1
A drive shaft (8) having an eccentric portion (8b) located in the center hole (13c, 14c) of (4) is inserted, and each orbiting scroll (13, 14)
2. The scroll type fluid device according to claim 1, wherein the orbit is adapted to revolve around each fixed scroll (10, 11). 3. The orbiting scrolls (13, 14) are arranged between the fixed scrolls (10, 11) while being prevented from rotating by a rotation preventing mechanism (18). 2. The scroll type fluid device according to 2. 4. An end plate having a central hole (10c, 11c) at the center thereof.
A spiral wrap (10b, 11b) is erected on the front surface of (10a, 11a), and a pair of fixed scrolls (10, 11) arranged such that the front surfaces face each other with a predetermined gap. The fixed scroll (1) is arranged between the fixed scrolls (10, 11) and has a central hole (12c) at the center.
0,11) wraps (10b, 11b) with the working chambers (15,1)
6) The orbiting scroll (12) having a pair of spiral wraps (13b, 14b) and the center holes (10c, 11c, 12c) of the above scrolls (10, 11, 12) are inserted and eccentric. Part (8b) is the center hole (1) of the orbiting scroll (12).
2c) and the drive shaft (8), and the rotation of the drive shaft (8) causes the orbiting scroll (12) to revolve with respect to the fixed scrolls (10, 11) so that the working chamber (15 , 16) is a method of manufacturing a scroll type fluid device in which the fluid is compressed by changing the internal volume, and the front face of the end plate (13a) is arranged facing one fixed scroll (10). The wrap (13a) standing on the front of (13a)
b) forms a working chamber (15) with the wrap (10b) of one fixed scroll (10), and the front face of the end plate (14a) has the other fixed scroll (11). ), And a wrap (14b) standing upright on the front of the end plate (14a).
When the orbiting scroll (12) is produced by combining the second orbiting scroll (14) forming the working chamber (16) with the wrap (11b) of the other fixed scroll (11), The orbiting scroll (13) and the second orbiting scroll (14) of the wrap (13b, 14b) are individually and individually attached to the center of the base circle and the center hole (13).
c, 14c) and the center of (c, 14c) are processed at the same time, and the back surface of the end plate (13a) of the first orbiting scroll (13) and the end plate (14a) of the second orbiting scroll (14) are A method for manufacturing a scroll type fluid device, characterized in that an orbiting scroll (12) is produced by superimposing the back surface on each other.