JP2002155874A - Scroll type compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate problems in a scroll type compressor comprising two pairs of fixed scrolls and movable scrolls disposed in such a way that end plates of the fixed scrolls face each other, and a main shaft actuation-engaged with the movable scrolls disposed to make revolution movement of the movable scrolls. SOLUTION: A main shaft 17 to which two movable scrolls 2 and 32 are integrally connected to be actuation-engaged to make revolution movement of them is disposed to penetrate the pair of movable scrolls on the outer side of spiral bodies 1b and 31b of the fixed scrolls 1 and 31 and spiral bodies 2b and 32b of the movable scrolls. Auxiliary shafts 20 and 23 having crank pins 20b and 23b to be engaged wit the movable scrolls to regulate rotation of the movable scrolls while allowing their revolution are disposed close to the center of gravity of the movable scrolls on the back surface side of the end plates of the movable scrolls, and a delivery route is disposed between the end plates 1a and 31a of the fixed scrolls.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor.

[0002]

2. Description of the Related Art Japanese Unexamined Patent Publication No. 59-65586 discloses that a fixed scroll having a spiral body provided on an end plate and a movable scroll having a spiral body provided on an end plate are engaged with each other, and a plurality of working spaces are provided therebetween. A scroll type compressor for orbiting the movable scroll with respect to the fixed scroll to compress the gas in the working space, wherein two pairs of the fixed scroll and the movable scroll couple the end plates of the fixed scroll to each other. A main shaft, which is disposed facing each other and operatively engages with the movable scroll to orbit the movable scroll, is disposed through the two sets of the fixed scroll and the movable scroll, and a discharge path is provided between end plates of the two fixed scrolls. Is disclosed. JP-A-59-6558
In the scroll compressor of No. 6, since both ends of the main shaft are supported by the housing, the scroll compressor is composed of a pair of fixed scroll and movable scroll, and the movable scroll is engaged with one end of the cantilevered main shaft. The whirling of the main shaft, which has occurred in the scroll type compressor, is suppressed, and the vibration and noise caused by the whirling of the main shaft are suppressed.

[0003]

Problems to be Solved by the Invention
The scroll compressor of No. 6 had the following problems. (1) Since the two movable scrolls are separated and independent from each other, a rotation preventing mechanism provided between an end plate of the movable scroll and a housing facing the end plate is accompanied by compression of gas in the working space. It wears under the thrust load, and the life of the compressor is shortened. Further, since it is difficult to reduce the size of the rotation preventing mechanism that receives a thrust load, it is difficult to reduce the size of the compressor. (2) Since the two movable scrolls are separated and independent from each other, it is necessary to individually adjust the axial gap in each of the two fixed scroll and movable scroll pairs. (3) Since the operation engaging portion between the main shaft and the movable scroll is disposed at the center of the spiral body of the movable scroll, the heat generated in the bearing of the operation engaging portion is not easily released to the outside, and the temperature of the bearing is high. And the bearing life is shortened. (4) There is no partition between the bearing at both ends of the main shaft, the bearing at the operation engaging portion of the main shaft and the orbiting scroll, and the suction chamber, and the bearing lubricating oil is mixed into the fluid sucked into the working space, and the discharge fluid is discharged. It cannot be used to compress clean fluids because it is contaminated. (5) Since there is no partition between the bearing at both ends of the main shaft, the bearing at the operation engagement portion between the main shaft and the orbiting scroll, and the suction chamber, the gas heated by the heat generated by the bearing and having an increased specific volume is used as the working space. And the actual compressor discharge flow rate decreases. (6) Since the bearings at both ends of the main shaft and the bearings of the operation engagement portion between the main shaft and the orbiting scroll are arranged in the substantially closed space,
The heat generated in the bearing is hardly released to the outside, the temperature of the bearing rises, and the life of the bearing is shortened. The present invention has been made in view of the above-mentioned problems, and a fixed scroll having a spiral body provided on an end plate and a movable scroll having a spiral body provided on an end plate are engaged with each other, and a plurality of actuations are provided therebetween. A scroll type compressor that forms a space, and orbits a movable scroll with respect to a fixed scroll to compress gas in an operating space, wherein two sets of fixed scrolls and a movable scroll move end plates of the fixed scroll to each other. In a scroll compressor in which a main shaft arranged to face each other, operatively engaged with the movable scroll and orbiting the movable scroll is arranged, and a discharge path is arranged between end plates of the two fixed scrolls, An object of the present invention is to provide a scroll compressor in which the problem is solved.

[0004]

In order to solve the above-mentioned problems, in the present invention, a fixed scroll having a spiral body provided on an end plate and a movable scroll having a spiral body provided on an end plate are engaged with each other. A scroll compressor in which a plurality of working spaces are formed between these, and a movable scroll is swirled with respect to a fixed scroll to compress gas in the working space. Are arranged with the back surfaces of the end plates of the fixed scroll facing each other, the two movable scrolls are integrally connected, and the main shaft for operatively engaging with the movable scroll and orbiting the movable scroll is a spiral body of the fixed scroll and A crank pin is provided outside the spiral of the movable scroll and penetrates the pair of movable scrolls and engages with the movable scroll. An auxiliary shaft that allows the swinging motion is provided near the center of gravity of each movable scroll, on the back side of the end plate of the movable scroll, and a discharge path is provided between the end plates of the two fixed scrolls. Is provided. In the scroll compressor according to the present invention, since both ends of the main shaft are supported by the housing accommodating the fixed scroll and the movable scroll, the whirling of the main shaft is suppressed, and the vibration and noise caused by the whirling of the main shaft are suppressed. Is suppressed. In the scroll compressor according to the present invention, the two movable scrolls integrally connected receive the thrust load accompanying the compression of the gas in the working space, and therefore, the rotation preventing mechanism formed by the auxiliary shaft reduces the thrust load. I do not receive. As a result, wear of the rotation prevention mechanism is suppressed, and a reduction in the life of the compressor is suppressed. Further, since the rotation preventing mechanism that does not receive the thrust load can be downsized, the compressor can be downsized. In the scroll compressor according to the present invention, the main shaft is disposed outside the fixed scroll spiral and the movable scroll spiral, so that the main shaft is disposed inside the fixed scroll spiral and the movable scroll spiral. The structure of the scroll can be simplified as compared with the case of disposing the scroll. In the scroll compressor according to the present invention, since the two movable scrolls are integrally connected, it is possible to adjust the axial gap between the two sets of the fixed scroll and the movable scroll in a single operation. it can.

In a preferred embodiment of the present invention, the auxiliary shafts are arranged offset from each other. The auxiliary axis is
If they are arranged offset from each other, the two sets of parallel crank mechanisms constituted by the main shaft and the auxiliary shaft cannot be at the same time as a conceivable point, so that there is no possibility that the compressor cannot be started.

In a preferred aspect of the present invention, an operation engagement portion between the main shaft and the movable scroll is provided on a back surface of an end plate of the movable scroll. If the operation engagement portion between the main shaft and the movable scroll is disposed on the back surface of the end plate of the movable scroll, the operation engagement portion comes close to the casing accommodating the fixed scroll and the movable scroll. In addition, heat generated in the bearing of the operation engagement portion is easily released to the outside of the compressor. As a result, the temperature of the bearing is suppressed from being raised, and the reduction in the bearing life is suppressed.

In a preferred aspect of the present invention, a cylindrical body surrounding the spiral body of the fixed scroll and the spiral body of the movable scroll is erected on the end plate of the fixed scroll, and the end face of the cylindrical body is movable via a seal member. It is in sliding contact with the scroll end plate. Between the rear surface of the end plate of the movable scroll and the housing facing the rear surface, a rotation preventing mechanism for the movable scroll, a bearing of a main shaft, a bearing of an operation engaging portion between the main shaft and the movable scroll, and the like are provided. If a cylinder surrounding the scroll of the fixed scroll and the scroll of the movable scroll is erected on the end plate of the fixed scroll, and the end surface of the cylinder slides on the end plate of the movable school via a seal member. Since a partition is formed between the rotation preventing mechanism of the movable scroll, the bearing of the main shaft, the bearing of the operation engaging portion of the main shaft and the movable scroll, and the compressor suction passage formed on the spiral body side of the movable scroll, The abrasion powder and grease of the bearing are prevented from entering the working space, and contamination of the compressor discharge fluid by the abrasion powder and grease of the bearing is prevented. Therefore, the scroll compressor according to the present invention can be used for compressing a clean fluid.

In a preferred embodiment of the present invention, a ventilation hole is formed in the housing facing the rear surface of the end plate of the movable scroll. Since the space formed by the rear surface of the end plate of the orbiting scroll and the housing facing the rear surface is opened to the atmosphere through a ventilation hole formed in the housing, a rotation preventing mechanism disposed in the space, Heat generated at an operation engagement portion between the main shaft and the movable scroll is discharged to the atmosphere through the ventilation holes. As a result, a decrease in compression efficiency due to thermal deformation of the orbiting scroll is suppressed, and a reduction in the life of the rotation preventing mechanism and the bearing due to elution of grease and thermal deformation is suppressed. In a preferred aspect of the present invention, cooling fins are provided upright on the back surface of the end plate of the movable scroll. By erecting the cooling fins on the back surface of the end plate of the movable scroll, the cooling efficiency of the movable scroll, the rotation preventing mechanism, and the bearing provided at the operation engagement portion of the main shaft with the movable scroll is improved.

In a preferred aspect of the present invention, a balance weight is attached to the auxiliary shaft, and an axial fan is attached to the balance weight. In a preferred aspect of the present invention, a balance weight is attached to the auxiliary shaft, and a centrifugal fan is attached to the balance weight. In order to cancel the centrifugal force generated by the orbiting motion of the movable scroll, a balance weight is attached to the auxiliary shaft. By attaching the axial flow fan or the centrifugal fan to the balance weight, the cooling efficiency of the movable scroll, the anti-rotation mechanism, and the bearing disposed at the operation engagement portion of the main shaft with the movable scroll is improved. In a preferred aspect of the present invention, the centrifugal fan is provided with a deflecting plate for directing the fan discharge air to the end plate of the movable scroll.
By attaching a deflecting plate for directing the fan discharge air to the end plate of the movable scroll to the centrifugal fan, the flow rate of air hitting the end plate of the movable scroll increases, and the cooling efficiency of the movable scroll improves.

In a preferred embodiment of the present invention, a cooling fluid path is provided between the end plates of the two fixed scrolls. The end plate of the fixed scroll is cooled by the cooling fluid flowing through the cooling fluid path, thermal deformation of the fixed scroll is suppressed, and a decrease in compression efficiency due to thermal deformation of the fixed scroll is suppressed. As a result, high-speed and high-efficiency operation of the compressor becomes possible.

In a preferred embodiment of the present invention, a turning radius r determined by a rotation preventing mechanism of the movable scroll is provided.
And a turning radius r 'determined by the scroll of the fixed scroll and the scroll of the movable scroll, r'>r>
(R'-0.3 mm). By setting r ′> r, contact between the scroll of the fixed scroll and the scroll of the movable scroll can be avoided, and generation of wear powder due to the contact can be prevented. By setting r>(r'-0.3 mm), it is possible to prevent a decrease in compression performance.

In a preferred embodiment of the present invention, a plurality of spindles are provided. By arranging the plurality of main shafts, it is possible to suppress bending deformation of the main shafts when orbiting the movable scroll, stabilize the posture of the movable scroll during operation, and prevent contact with the fixed scroll.

In a preferred embodiment of the present invention, a motor is connected to the main shaft. Even when a plurality of spindles are provided, a plurality of spindles can be synchronously rotated without using a complicated mechanism by connecting a motor to each spindle and rotating each motor synchronously.

In a preferred embodiment of the present invention, two fixed scrolls are integrally formed. By integrally forming the two fixed scrolls, the number of components is reduced.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A scroll compressor according to an embodiment of the present invention will be described with reference to FIGS. As shown in FIGS. 3 and 4, the scroll type compressor according to the present embodiment includes a fixed scroll 1 having a disk-shaped end plate 1a and a spiral body 1b erected on the end plate 1a. End plate 2a and end plate 2a
And a movable scroll 2 which has a spiral body 2b provided upright and engages with the fixed scroll 1 to form a plurality of working spaces 3A. End plate 1
a and the spiral body 1b are integrally formed, and the end plate 2a and the spiral body 2
b is integrally formed. The scroll type compressor according to the present embodiment includes a fixed scroll 31 having a disk-shaped end plate 31a and a spiral body 31b erected on the end plate 31a, and a disk-shaped end plate 32a and an end plate 32a. Upright spiral body 32
b) and a movable scroll 32 that engages with the fixed scroll 31 to form a plurality of working spaces 33A. End plate 31a and spiral body 3
1b is integrally formed, and the end plate 32a and the spiral body 32b are integrally formed. The scroll assembly α and the scroll assembly β are disposed so that the back surface of the end plate 1a of the fixed scroll 1 and the back surface of the end plate 31a of the fixed scroll 31 face each other at a predetermined distance.

A discharge hole 1c is formed at the center of the end plate 1a of the fixed scroll 1, and an end plate 31a of the fixed scroll 31 is formed.
A discharge hole 31c is formed at the center of the. Spiral body 1
A cylindrical body 1d surrounding b, 2b is erected on the end plate 1a of the fixed scroll 1, and a cylindrical body 31d surrounding the spiral bodies 31b, 32b is erected on the end plate 31a of the fixed scroll 31. The end plate 1a and the cylindrical body 1d are integrally formed, and the end plate 31a and the cylindrical body 31d are integrally formed. The fixed scroll 1 and the fixed scroll 31 are formed integrally. Accordingly, the end plate 1a and the end plate 31a are integrally connected to form the thick disk 3, and the cylindrical body 1d and the cylindrical body 31d are formed.
And are integrally connected to form a cylindrical body 4. As shown in FIGS. 1, 4, 6, and 7, a part of the cylindrical body 4 is radially outwardly thickened over a predetermined circumferential length and over the entire length in the axial direction. A bulge 4a is formed. A pair of bulging portions 4 sandwiching the central axis of the cylindrical body 4 therebetween.
a are arranged facing each other.

As shown in FIG. 7, the thick disk 3 has a bottom wall at the center of the thick disk 3, extends radially outward, and extends on the outer peripheral surface of one bulging portion 4a. An opening 3a is formed. Holes 3b and 3c having a bottom wall formed by the cylindrical body 4 and extending in parallel with the hole 3a and opening to the outer peripheral surface of one bulging portion 4a are formed in the thick disk 3. Holes 3b, 3
The entrance of c is united. Holes 3d, 3e having a bottom wall formed by the cylindrical body 4 in the thick disk 3 and extending parallel to the hole 3a and opening to the outer peripheral surface of the other bulging portion 4a.
Are formed. The entrances of the holes 3d and 3e are united. A communication hole 3f between the hole 3c and the hole 3d is formed in the thick disk 3. The other bulging portion 4a is formed with a hole 4b whose one end opens to the outer peripheral surface of the bulging portion 4a.
The holes 3a, 3b, 3c, 3d, 3e, and 4b are formed in the thick-walled disk 3 and the bulging portion 4 when the fixed scroll 1 and the fixed scroll 31 are integrally cast. Communication hole 3f
Is formed by machining after forming the holes 3a, 3b, 3c, 3d, 3e, 4b.

As shown in FIGS. 1, 4, and 6, a partition member 5 having a curved plate-shaped lid 5a and a partition plate 5b extending from the inner surface of the lid 5a is provided. Discharge port 5c on lid 5a
And a cooling fluid inlet 5d. The partition member 5 is screwed to the one bulging portion 4a with the inner surface of the lid 5a abutting on the outer peripheral surface of the one bulging portion 4a and the partition plate 5b having entered the hole 3b. A curved plate-shaped lid 6a;
The partition member 6 having the partition plates 6b and 6c extending from the inner surface of FIG. A cooling fluid outlet 6d in the lid 6a;
A suction port 6e is formed. The inner surface of the lid 6a comes into contact with the outer peripheral surface of the other bulging portion 4a, and the partition plate 6b has a hole 3d.
With the partition plate 6c entering the hole 3e,
The partition member 6 is screwed to the other bulging portion 4a.

As can be seen from FIGS. 4 and 6, the hole 3a is provided with an end plate 1a of the fixed scroll 1 and an end plate 31a of the fixed scroll 31 for connecting the discharge path 7 communicating with the discharge holes 1c, 31c and the discharge port 5c. And formed between. 3 and 6, the holes 3b, 3c, 3d, 3e, the communication holes 3
f is a cooling fluid path 8 communicating with the cooling fluid inlet 5d and the cooling fluid outlet 6d in cooperation with the partition plates 5b, 6b, 6c.
Are connected to the end plate 1a of the fixed scroll 1 and the fixed scroll 3
It is formed between the first end plate 31a. As can be seen from FIGS. 4 and 6, the hole 4b communicates with the suction port 6e, and communicates with the cylindrical body 4 through an opening 4c formed in the cylindrical body 4 that forms a part of the other bulging portion 4a. The cylinder 4 communicates with the suction chamber 9 formed between the scroll body 1b of the fixed scroll 1 and the cylindrical body 4 through an opening 4d formed in the cylindrical body 4 that forms a part of the other bulging portion 4a. The fixed scroll 31 communicates with the suction chamber 10 formed between the scroll 31 and the spiral body 31b.

As shown in FIGS. 1, 3, 8, and 9, a boss 2c is formed at the center of the rear surface of the end plate 2a of the movable scroll 2. A radially outward bulging portion 2d is formed on the peripheral edge of the end plate 2a of the orbiting scroll 2, and a through hole 2e is formed in the bulging portion. A boss 2f is formed on the back surface of the bulging portion 2d so as to surround the through hole 2e. A pair of bulging portions 2d, through holes 2e, and bosses 2f are arranged facing each other with the boss 2c interposed therebetween. A plurality of radial fins 2g are end plates 2a.
It is erected on the back of. Radial fin 2g is end plate 2a
And are formed integrally. End plate 32 of movable scroll 32
A boss 32c is formed at the center of the back surface of a. A radially outwardly bulging portion 32d is formed on the peripheral edge of the end plate 32a of the orbiting scroll 32, and a through hole 32e is formed in the bulging portion. A boss 32f is formed on the back surface of the bulging portion 32d so as to surround the through hole 32e. A pair of bulges 32d, through holes 32e, and bosses 32f are arranged facing each other with the boss 32c interposed therebetween. A plurality of radial fins 32g are provided upright on the back surface of the end plate 32a. Radial fin 32
g is formed integrally with the end plate 32a. The bulging portion 2d faces the bulging portion 32d. As can be seen from FIG. 1, the bulging portions 2d and 32d are substantially 9
They are arranged at 0 degrees. As shown in FIGS. 1 and 3, between the swelling portion 2 d and the swelling portion 32 d, the swelling portions 2 d, 32 d having a curved portion having substantially the same shape as the bosses 2 f, 32 f and the connection pillar 11 having substantially the same shape as the swelling portion. 12 are provided. The movable scroll 2 and the movable scroll 32 include a pair of connecting columns 11,
The shim 12 and the two bolts 13 that are inserted into the bulging portions 2d, the connecting pillars 11, and the shim 12 and are screwed to the bulging portions 32d are integrally connected.

As shown in FIGS. 1 to 4, a bottomed cylindrical housing 14 for accommodating the scroll assembly α and a bottomed cylindrical housing 15 for accommodating the scroll assembly β are provided. Part of the end surface of the cylindrical body of the housing 14 is in contact with part of the end surface of the cylindrical body of the housing 15. The other part of the end surface of the cylindrical body of the housing 14 and the other part of the end surface of the cylindrical body of the housing 15 are in contact with the end surface of the bulging portion 4a of the fixed scroll. As can be seen from FIGS. 1 and 4, the housings 14 and 15 and the fixed scrolls 1 and 31 are inserted into the housing 14 and the bulging portion 4 a of the fixed scroll and are bolted by four bolts 16 screwed to the housing 15. , Are integrally connected. A ventilation hole 14a is formed in the housing 14 so as to face the rear surface of the end plate 2a of the movable scroll 2, and the end plate 32a of the movable scroll 32 is formed.
A ventilation hole 15a is formed in the housing 15 so as to face the rear surface of the housing 15. A boss 14b is formed on the housing 14 so as to face the boss 2c of the movable scroll 2, and a boss 15 is formed on the housing 15 so as to face the boss 32c of the movable scroll 32.
b is formed.

As shown in FIGS. 1 and 3, a pair of main shafts 17 are disposed facing each other with the bosses 2c and 32c of the orbiting scrolls 2 and 32 interposed therebetween. The main shaft 17 is disposed radially outside the scrolls 1b and 31b of the fixed scrolls 1 and 31 and the scrolls 2b and 32b of the movable scrolls 2 and 32. The main shaft 17 has small diameter portions 17a, 17 at both ends.
b and a central large-diameter portion 17c. Small diameter part 17
a and 17b extend concentrically, and the large-diameter portion 17c is
a, 17b extend eccentrically. The small diameter portion 17a is inserted into the housing 14 and is supported by the housing 14 via a bearing 18a. The small diameter portion 17b is inserted into the housing 15 and is supported by the housing 15 via a bearing 18b. The large diameter portion 17c has a through hole 2e of the movable scroll 2 and a through hole 32e of the movable scroll 32.
And has been inserted. The central portion of the large diameter portion 17c is cut out in a semi-cylindrical shape to reduce the weight. Large diameter part 17c
Is supported by a boss 2f of the orbiting scroll 2 via a bearing 19a, and the other end of the large-diameter portion 17c is
It is supported by the boss 32f of the movable scroll 32 via b. The main shaft 17 is operatively engaged with the movable scroll 2 via the bearing 19a and the boss 2f, and is operatively engaged with the movable scroll 32 via the bearing 19b and the boss 32f.

As shown in FIG. 3 and FIG.
and an auxiliary shaft 20 having a large-diameter crankpin 20b formed eccentrically at one end of the shaft main body 20a is disposed between the housing 14 and the orbiting scroll 2. The shaft body 20a is supported by a boss 14b of the housing 14 via a bearing 21a, and the crank pin 20b is
a is supported by the boss 2c of the orbiting scroll 2 via a. An auxiliary shaft 23 having a small-diameter shaft main body 23a and a large-diameter crankpin 23b formed eccentrically at one end of the shaft main body 23a is provided with a housing 15 and a movable scroll 32.
It is arranged between and. The shaft main body 23a is supported by a boss 15b of the housing 15 via a bearing 21b, and the crank pin 23b is supported by a boss 32c of the movable scroll 32 via a bearing 22b. As can be seen from FIG. 8, the shaft main body 20a of the auxiliary shaft 20 and the shaft main body 23a of the auxiliary shaft 23 extend so as to be offset from each other. Auxiliary shafts 20, 23, bearings 21a, 21b, 22a,
22b constitutes a rotation preventing mechanism of the movable scrolls 2 and 32. The turning radii r of the orbiting scrolls 2 and 32 determined by the rotation preventing mechanism constituted by the auxiliary shafts 20 and 23, the scrolls 1b and 31b of the fixed scrolls 1 and 31, and the scrolls 2b and 32b of the movable scrolls 2 and 32. And r ′>r> (r′−0.
3mm) is set.

As shown in FIGS. 1 and 3, a semi-circular balance weight 24a is fixed to the shaft body 20a of the auxiliary shaft 20. A semicircular centrifugal fan 25a is attached to the balance weight 24a. In the centrifugal fan 25a,
A deflecting plate 25 a ′ for flowing the discharged air toward the end plate 2 a of the movable scroll 2 is attached. Auxiliary shaft 23
A semi-circular balance weight 24b is fixed to the shaft body 23a. A semicircular centrifugal fan 25b is attached to the balance weight 24b. Centrifugal fan 25
b, a deflecting plate 25 b ′ for flowing the discharged air toward the end plate 32 a of the movable scroll 32 is attached.

As shown in FIGS.
The annular seal member 26a embedded in the end face of the cylindrical body 1d is in sliding contact with the end plate 2a of the movable scroll 2, and the annular seal member 26b embedded in the end face of the cylindrical body 31d of the fixed scroll 31 is movable. 32 end plates 32
a in sliding contact.

The operation of the scroll compressor according to this embodiment will be described. The small diameter portions 17a of the pair of main shafts 17 are rotationally driven synchronously by a drive source (not shown). Small diameter part 17a
Large diameter part 1 eccentric to the small diameter part 17a with the rotation of
7c revolves around the central axis X1 of the small diameter portion 17a. The turning motion includes the bosses 2f and 32f, the bearing 19a,
The light is transmitted to the movable scrolls 2 and 32 operatively engaged with the large-diameter portion 17c through 19b, and the movable scrolls 2 and 32 integrally assembled with each other orbit around the axis X1. As the orbiting scrolls 2 and 32 orbit around the axis X1, the crank pins 20 of the auxiliary shafts 20 and 23 are moved.
b, 23b are central axes X2 of the shaft main bodies 20a, 23a,
It turns around X3. The movable scrolls 2, 32 are provided by a rotation preventing mechanism constituted by the auxiliary shafts 20, 23 and the like.
Is allowed and rotation is prevented. As shown by the white arrows in FIGS. 4 and 6, the gas flowing into the compressor from the suction port 6e flows through the holes 4b, the openings 4c and 4d, and the suction chambers 9 and 10.
Through the working space 3A, 33A, the working space 3A, 33A is reduced in volume while the fixed scroll 1,
It moves toward the center of 31, and the gas in the working spaces 3A and 33A is compressed. The compressed gas is supplied to discharge ports 1c formed in the end plates 1a, 31a of the fixed scrolls 1, 31,
It discharges to discharge path 7 via 31c, flows through discharge path 7, and flows out of the compressor via discharge port 5c.

In the scroll type compressor according to the present embodiment, since both ends of the main shaft 17 are supported by the housings 14 and 15, whirling of the main shaft 17 is suppressed, and vibration caused by whirling of the main shaft 17 is reduced. Noise is suppressed.
In the scroll compressor according to the present embodiment, the two movable scrolls 2, 32 integrally connected receive the thrust load accompanying the compression of the gas in the working spaces 3A, 33A. Auxiliary shaft 20 disposed between the housing 2a and the housing 14 facing the end plate 2a.
Anti-rotation mechanism, movable scroll 32
The anti-rotation mechanism constituted by the auxiliary shaft 23 and the like disposed between the end plate 32a and the housing 15 facing the end plate 32a does not receive a thrust load. As a result, wear of the rotation prevention mechanism is suppressed, and a reduction in the life of the compressor is suppressed. Further, since the rotation preventing mechanism that does not receive the thrust load can be downsized, the compressor can be downsized. In the scroll compressor according to the present embodiment, the main shaft 17 is provided outside the scrolls 1b and 31b of the fixed scrolls 1 and 31, and the scrolls 2b and 32b of the movable scrolls 2 and 32. When the main shaft 17 is disposed inside the spirals 1b, 2b, 31b, 32b, the main shaft 17 and the spirals 1b, 2b, 31
b, 32b and the working space 3A, 33
A main shaft insertion passage for preventing the gas in A from leaking through the through portion of the main shaft 17 must be formed in the scroll assemblies α and β, and the structure of the scroll assemblies α and β is complicated. Become The main shaft 17 is connected to the spiral bodies 1b, 2b, 31b,
By disposing the scroll assemblies 32b outside, the structure of the scroll assemblies α and β can be prevented from becoming complicated. In the scroll compressor according to the present embodiment, the two fixed scrolls 1 and 31 are integrally formed and the two movable scrolls 2 and 32 are integrally connected, so that the two movable scrolls 2 and 32 are integrated. The fixed scroll 1 and the movable scroll can be moved in a single operation by adjusting the length of the connecting pillar 11 to be connected to the movable scroll 32 or adjusting the thickness of the shim 12 sandwiched between the end face of the connecting pillar 11 and the movable scroll 32. The axial gap between the scroll 2 and the axial gap between the fixed scroll 31 and the movable scroll 32 can be adjusted.

In the scroll type compressor according to the present embodiment, the main shafts 17 and the auxiliary shafts 20 are formed so as to be offset from each other. And the parallel crank mechanism formed by the main shaft 17 and the auxiliary shaft 23 cannot be considered at the same time. Accordingly, there is no possibility that the scroll compressor according to the present embodiment cannot be started.

In the scroll compressor according to the present embodiment, the large diameter portion 17c of the main shaft 17 and the movable scrolls 2, 3
Since the bearings 19a and 19b and the bosses 2f and 32f which form the operation engagement portion with the movable scroll 2 are disposed on the back surfaces of the end plates 2a and 32a of the movable scroll, these members are connected to the housing 1.
Close to 4 and 15. As a result, the heat generated in the bearings 19a and 19b of the working engagement portion is easily released to the outside of the compressor via the housings 14 and 15, and the bearings 19a and 19b are released.
b is suppressed, and the life of the bearings 19a and 19b is prevented from being shortened.

In the scroll type compressor according to the present embodiment, the annular seal member 26a embedded in the end face of the cylindrical body 1d of the fixed scroll 1 is provided with the end plate 2 of the movable scroll 2.
a, and the annular seal member 26b embedded in the end surface of the cylindrical body 31d of the fixed scroll 31 is in sliding contact with the end plate 32a of the movable scroll 32, so that the movable scrolls 2, 32 have the spiral bodies 2b, 32b side. , Hole 4b, opening 4
c, 4d, a partition is formed between a compressor suction path formed by the suction chambers 9, 10 and a rotation preventing mechanism formed by the auxiliary shafts 20, 23, and the bearings 18a, 18b, 19a, 19b. . As a result, the anti-rotation mechanism formed by the auxiliary shafts 20, 23, etc., the bearings 18a, 18b, 19
a, working space 3A, 33A for 19b wear powder and grease
Of the compressor discharge gas due to the abrasion powder and grease is prevented. Therefore, the scroll compressor according to the present embodiment can be used for compressing a clean fluid. A rotation prevention mechanism formed by a compressor suction passage, auxiliary shafts 20, 23, etc., bearings 18a, 18b, 19a, 19
b, a partition is formed between the auxiliary shafts 20 and 23.
Anti-rotation mechanism, bearings 18a, 18
The suction of the gas heated by the heat generated in b, 19a, 19b and having an increased specific volume into the working spaces 3A, 33A is prevented, and a substantial decrease in the compressor discharge flow rate is prevented. In the scroll-type compressor according to the present embodiment, since there is no bearing or sliding portion on the way of the discharge path 7, there is no possibility that the compressor discharge gas is contaminated by grease or wear powder.

In the scroll compressor according to the present embodiment, the space formed by the back surfaces of the end plates 2a and 32a of the orbiting scrolls 2 and 32 and the housings 14 and 15 facing the back surface is formed by ventilation holes 14a and 14b. Since the air is released to the atmosphere via 15a, the auxiliary shaft 20 disposed in the space,
And the bearings 18a, 18
b, 19a, 19b generate heat at the ventilation holes 14a, 15b.
It is discharged to the atmosphere via a. As a result, a decrease in compression efficiency due to thermal deformation of the orbiting scrolls 2 and 32 is suppressed, and a rotation preventing mechanism and bearings 18a, 18b, and 19 formed by the auxiliary shafts 20, 23 and the like due to grease elution and thermal deformation.
a, 19b is suppressed from being shortened.

In the scroll compressor according to the present embodiment, since the cooling fins 2g and 32g are formed on the back surfaces of the end plates 2a and 32a of the orbiting scrolls 2 and 32,
A rotation preventing mechanism formed by the orbiting scrolls 2, 32, the auxiliary shafts 20, 23, etc., bearings 18a, 18b, 19a, 19b.
Cooling efficiency is improved.

In the scroll compressor according to the present embodiment, the centrifugal force generated by the orbiting motion of the orbiting scrolls 2 and 32 is canceled by the balance weights 24a and 24b, and the whirling of the main shaft 17 is suppressed. Vibration and noise caused by the whirling of the object are suppressed. Centrifugal fan 25 attached to balance weights 24a, 24b
Since the outside air is sucked into the housings 14 and 15 through the ventilation holes 14a and 15a by the a and 25b, the anti-rotation mechanism formed by the orbiting scrolls 2 and 32 and the auxiliary shafts 20 and 23, the bearings 18a and 18b, The cooling efficiency of 19a and 19b is improved. The centrifugal fans 25a, 25b 'are mounted on the centrifugal fans 25a, 25b.
Since the discharge air of the movable scrolls 2 and 32 is directed toward the end plates 2a and 32a of the movable scrolls 2 and 32, the flow rate of the air impinging on the end plates 2a and 32a of the movable scrolls 2 and 32 increases. Cooling efficiency is improved.

In the scroll compressor according to the present embodiment, the cooling fluid path 8 from the inlet 5d to the outlet 6d is provided between the end plates 1a, 31a of the fixed scrolls 1, 31. As shown by black arrows in FIG. 6, the cooling fluid such as air and water flowing through the cooling fluid path 8
The end plates 1a and 31a of the fixed scrolls 1 and 31 are cooled, thermal deformation of the fixed scrolls 1 and 31 is suppressed, and reduction in compression efficiency due to thermal deformation of the fixed scrolls 1 and 31 is suppressed.

In the scroll type compressor according to the present embodiment, the orbiting scrolls 2 and 32 determined by the rotation preventing mechanism formed by the auxiliary shafts 20 and 23 and the turning radius r of the scrolls 1 and the scroll 1b of the fixed scrolls 1 and 31 are used. , 31b and the orbital radii r 'determined by the scrolls 2b, 32b of the movable scrolls 2, 32, r'> r, so that the scrolls 1b, 31b of the fixed scrolls 1, 31 and the scroll It is possible to avoid contact of the scrolls 2 and 32 with the scrolls 2b and 32b and to prevent generation of wear powder due to the contact. Also, since r>(r'-0.3 mm), it is possible to prevent a decrease in compression performance.

In the scroll compressor according to the present embodiment, since the plurality of main shafts 17 are provided, the bending deformation of the main shafts 17 when the movable scrolls 2 and 32 are driven to rotate is suppressed, and the movable shafts during operation are movable. The postures of the spirals 2b and 32b can be stabilized, and contact with the fixed spirals 1b and 31b can be prevented.

In the scroll compressor according to the present embodiment, since the fixed scroll 1 and the fixed scroll 31 are integrally formed, the number of components is reduced as compared with the case where both are formed separately. .

Although the embodiment of the present invention has been described above, the present invention is not limited to the above embodiment. Fixed scroll 1, 31
Spiral bodies 1b and 31b may be formed with a phase shift of 180 degrees from each other. Pulsation of gas discharged from a scroll assembly α composed of a fixed scroll 1 and a movable scroll 2;
A 180-degree phase shift occurs between the pulsation of the discharge gas of the scroll assembly β composed of the fixed scroll 31 and the movable scroll 32, and the pulsations of the two discharge gases cancel each other out in the discharge path 7, and the discharge is performed. Generation of noise due to gas pulsation is prevented. Further, a 180-degree phase shift occurs between the pulsation of the suction gas to the scroll assembly α and the pulsation of the suction gas to the scroll assembly β.
The pulsations of the two suction gases in b cancel each other, and the generation of noise due to the pulsation of the suction gas is prevented. The balance weight 24a and the centrifugal fan 25a may be separate or integrated. Balance weight 24b and centrifugal fan 25
It may be separate from or integral with b. Centrifugal fan 25a,
Instead of 25b, an axial fan may be attached to balance weights 24a and 24b. The number of the main shafts 17 is one.
However, it may be three or more. The main shaft 17 may be driven via an appropriate power transmission mechanism, or a motor may be connected to the main shaft 17 to drive the main shaft 17 directly. Even when a plurality of spindles 17 are provided, by rotating the respective motors synchronously, a plurality of spindles 1 can be used without using a complicated mechanism.
7 can be rotated synchronously. The separate fixed scroll 1 and the fixed scroll 31 may be integrally connected.

[0039]

As described above, in the scroll type compressor according to the present invention, since both ends of the main shaft are supported by the housing for accommodating the fixed scroll and the movable scroll, whirling of the main shaft is suppressed, Vibration and noise caused by whirling of the main shaft are suppressed. In the scroll compressor according to the present invention, the two movable scrolls integrally connected receive the thrust load accompanying the compression of the gas in the working space, and therefore, the rotation preventing mechanism formed by the auxiliary shaft reduces the thrust load. I do not receive. As a result,
Wear of the anti-rotation mechanism is suppressed, and a decrease in the life of the compressor is suppressed. Further, since the rotation preventing mechanism that does not receive the thrust load can be downsized, the compressor can be downsized. In the scroll compressor according to the present invention, the main shaft is disposed outside the fixed scroll spiral and the movable scroll spiral, so that the main shaft is disposed inside the fixed scroll spiral and the movable scroll spiral. Compared to the case of arranging,
The structure of the scroll can be simplified. In the scroll compressor according to the present invention, since the two movable scrolls are integrally connected, it is possible to adjust the axial gap between the two sets of the fixed scroll and the movable scroll in a single operation. it can.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a side view of the scroll compressor according to the embodiment of the present invention.

FIG. 3 is a side sectional view of the scroll compressor according to the embodiment of the present invention, and is a view as viewed in the direction of arrows YY in FIG. 2;

FIG. 4 is a side sectional view of the scroll compressor according to the embodiment of the present invention, and is a view as viewed in the direction of arrows XX in FIG. 2;

FIG. 5 is a cross-sectional view of the scroll compressor according to the embodiment of the present invention, and is a view taken along the line AA of FIG. 3;

FIG. 6 is a transverse sectional view of the scroll compressor according to the embodiment of the present invention, and is a view as viewed in the direction of arrows BB in FIG.

FIG. 7 shows a scroll type compressor according to an embodiment of the present invention.
FIG. 4 is a cross-sectional view in a state where some members have been removed, and is a view taken in the direction of arrows BB in FIG. 3 in a state where some members have been removed.

FIG. 8 is a rear view of a movable scroll of the scroll compressor according to the embodiment of the present invention.

FIG. 9 is a front view of a movable scroll of the scroll compressor according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1, 31 Fixed scroll 2, 32 Movable scroll 3 Thick disk 3A, 33A Working space 4 Cylindrical body 5, 6 Partition member 7 Discharge path 8 Cooling fluid path 9, 10 Suction chamber 11 Connecting column 12 Shim 13, 16 Bolt 17 Main shaft 20, 23 Auxiliary shaft

Claims (15)

[Claims] 1. A fixed scroll having a spiral body provided on an end plate and a movable scroll having a spiral body provided on an end plate are engaged with each other to form a plurality of working spaces therebetween. A scroll type compressor that makes a revolving motion to compress the gas in the working space, wherein two pairs of a fixed scroll and a movable scroll are disposed with the back surfaces of the end plates of the fixed scroll facing each other,
Two movable scrolls are integrally connected, and a main shaft operatively engaged with the movable scroll and orbiting the movable scroll is arranged so as to penetrate a pair of the movable scroll outside the fixed scroll scroll and the movable scroll scroll. An auxiliary shaft having a crank pin that engages with the orbiting scroll and that restricts the rotation of the orbiting scroll and allows a revolving motion is disposed on the back side of the end plate of the orbiting scroll near the center of gravity of each orbiting scroll, A scroll compressor wherein a discharge path is provided between end plates of two fixed scrolls. 2. The scroll compressor according to claim 1, wherein the auxiliary shafts are arranged offset from each other. 3. The scroll compressor according to claim 1, wherein an operation engagement portion between the main shaft and the movable scroll is disposed on a rear side of an end plate of the movable scroll. 4. An end plate of the fixed scroll is provided with a tubular body surrounding the spiral body of the fixed scroll and the spiral body of the movable scroll, and an end face of the tubular body slides on the end plate of the movable scroll via a seal member. 2. The device according to claim 1, wherein
The scroll compressor according to any one of claims 1 to 3. 5. The scroll type compressor according to claim 1, wherein a ventilation hole is formed in a housing facing a back surface of an end plate of the movable scroll. 6. A cooling fin is provided upright on a back surface of an end plate of a movable scroll.
The scroll compressor according to any one of claims 1 to 4. 7. The scroll type compressor according to claim 1, wherein a balance weight is attached to the auxiliary shaft, and an axial fan is attached to the balance weight. 8. The scroll type compressor according to claim 1, wherein a balance weight is attached to the auxiliary shaft, and a centrifugal fan is attached to the balance weight. 9. The scroll compressor according to claim 8, wherein a deflection plate for directing fan discharge air to an end plate of the movable scroll is attached to the centrifugal fan. 10. The scroll type compressor according to claim 1, wherein a cooling fluid path is provided between end plates of the two fixed scrolls. 11. A turning radius r determined by a rotation preventing mechanism of a movable scroll, and a turning radius r ′ determined by a scroll of a fixed scroll and a scroll of a movable scroll.
The scroll compressor according to any one of claims 1 to 10, wherein there is a relationship of r '>r>(r'-0.3mm). 12. The scroll compressor according to claim 1, wherein a plurality of spindles are provided. 13. The scroll compressor according to claim 1, wherein a motor is connected to the main shaft. 14. The scroll compressor according to claim 1, wherein two fixed scrolls are formed integrally. 15. The scroll compressor according to claim 1, wherein the spirals of the two fixed scrolls are 180 degrees out of phase with each other.