JPH0579473A - Scroll type fluid machine - Google Patents

Abstract

PURPOSE:To facilitate formation of a proper gap in a thrust direction between a fixed scroll and revolving scroll. CONSTITUTION:After a fixed scroll 25 is mounted on a revolving scroll 5, a support plate 21 is temporarily locked to a casing 1 by means of mounting bolts 9. By pressing a press seat 26 by means of a press bolt 27, the fixed scroll 25 is pressed toward the revolving scroll 5 side until the addenda of lap parts 5B and 25B are brought into contact with the bottoms of end plates 25A and 5A. With this state, after the fixed scroll 25 is fixed to the support plate 21 by means of a fixing bolt 28, a support plate 21 is removed from the casing 1 once, and a shim 29 is engaged between a flange part ID and a mounting flange 24. Finally, the mounting flange 24 is fastened against the flange part ID through the shim 29 by means of mounting bolts 9. A gap delta in a thrust direction approximately equal to a thickness (t) is formed between the end plates 5A, 25A and the lap parts 25B, 5B, respectively.

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 machine suitable for use in, for example, an air compressor for compressing air.

[0002]

2. Description of the Related Art FIG. 3 shows an example of an oil-free scroll type air compressor as a scroll type fluid machine according to the prior art.

In the figure, reference numeral 1 denotes a stepped cylindrical casing, which is formed by a disc-shaped bottom portion 1A located at one axial end and projecting inward from the inner peripheral side of the bottom portion 1A. Bearing portion 1B and a cylindrical portion 1C as a cylindrical portion extending from the outer peripheral side of the bottom portion 1A toward the other end side in the axial direction.
And a stepped tubular flange portion 1D integrally formed on the tip side of the cylindrical portion 1C. The inner peripheral side of the flange portion 1D slides on the rear surface of the orbiting scroll 5 described later. Thrust receiving part 1E that contacts and receives the load in the thrust direction
Are formed integrally so as to project inward in the radial direction. Also,
The bottom portion 1A of the casing 1 has a plurality of communication holes 1F, 1
F, ... (Only two are shown) are bored in the axial direction, and each communication hole 1F introduces outside air into the casing 1,
The orbiting scroll 5 and the like are cooled.

Reference numeral 2 denotes a bearing 3 in a bearing portion 1B of the casing 1.
4 shows a drive shaft that is rotatably supported via a crankshaft 2, and the tip end side of the drive shaft 2 extends into the casing 1 and the crank 2
A, and the axis O'-O 'of the crank 2A is the drive shaft 2
It is eccentric by a predetermined dimension d with respect to the axis O-O. The base end side of the drive shaft 2 is connected to an electric motor (not shown) outside the casing 1 and is rotationally driven by the electric motor.

Reference numeral 5 denotes an orbiting scroll which is located inside the casing 1 and is provided on the crank 2A of the drive shaft 2 so as to be able to orbit. The orbiting scroll 5 is a disk-shaped end plate 5A and the end plate 5A. A spirally wrapped wrap portion 5 that is provided upright with the center side as the winding start end and the outer peripheral side as the winding end end.
B and a boss portion 5C provided at the center of the rear surface of the end plate 5A, and a crank 2A is mounted in the boss portion 5C via a swivel bearing 6. Also, the wrap portion 5
A thrust direction gap δ is defined between the tip end side of B (the tip of the tooth) and the front side of the end plate 7A (the bottom of the tooth) of the fixed scroll 7 described later.

Here, the end plate 5A of the orbiting scroll 5
A plurality of key grooves are formed on the outer peripheral side of the back surface at predetermined intervals in the circumferential direction, and an Oldham coupling (not shown) as a rotation preventing mechanism is arranged in each of the key grooves.
When the drive shaft 2 is rotationally driven, the orbiting scroll 5 is given a circular motion having a orbiting radius of the dimension d by the crank 2A, and the Oldham coupling prevents rotation, so that the axis O-O of the drive shaft 2 is prevented. It keeps turning (orbiting) around.

Reference numeral 7 denotes a fixed scroll which is provided on the other axial side of the casing 1 so as to face the orbiting scroll 5, and the center of the fixed scroll 7 is located on the axis O--O of the drive shaft 2. And the end plate 7A arranged as
A spiral winding wrap portion 7B that is erected in the same manner as the wrap portion 5B of the orbiting scroll 5 and a large-diameter tubular portion 7C that is integrally provided to surround the outer peripheral side of the end plate 7A. A mounting flange 7D that abuts the flange portion 1D of the casing 1 is integrally formed on the tip end side of the cylindrical portion 7C. Also, the wrap portion 7B of the fixed scroll 7
A thrust direction gap δ is formed between the tip end side (tooth tip) and the end face 5A front surface (root bottom) of the orbiting scroll 5, and the orbiting scroll 5 is provided on the inner peripheral side of the mounting flange 7D of the fixed scroll 7. A thrust receiving portion 7E that is in sliding contact with the other end surface and receives the load in the thrust direction is integrally formed. The fixed scroll 7 has a mounting flange 7D.
Is abutted against the flange portion 1D of the casing 1 and is fastened to the casing 1 via mounting bolts 9, 9 ,.

Reference numerals 8 and 8 denote a plurality of compression chambers defined between the wrap portion 5B of the orbiting scroll 5 and the wrap portion 7B of the fixed scroll 7, and each compression chamber 8 is a wrap of the fixed scroll 7. The wrap portion 5B of the orbiting scroll 5 is shifted by a predetermined angle from the portion 7B and is overlapped with the wrap portion 5B.

[0009] Reference numerals 9, 9, ... Show a plurality of mounting bolts (only two are shown) provided on the mounting flange 7D of the fixed scroll 7 so as to be spaced apart from each other in the circumferential direction. Is fastened to the casing 1.

Reference numeral 10 denotes a suction port formed in the cylindrical portion 7C of the fixed scroll 7, and 11 denotes a discharge port formed in the end plate 7A of the fixed scroll 7. The suction port 10 is the outermost peripheral side (the lowest pressure side). ), The discharge port 11 communicates with the most central side (highest pressure side) compression chamber 8. Also, 1
Reference numeral 2 denotes a counterweight fixed to the drive shaft 2, and the counterweight 12 balances the rotation of the drive shaft 2.

The scroll air compressor according to the prior art has the above-mentioned structure, and when the drive shaft 2 is rotationally driven by the electric motor, this rotation is transmitted from the crank 2A to the orbiting scroll 5 via the orbiting bearing 6. Therefore, the orbiting scroll 5 orbits about the axis O-O of the drive shaft 2 with an orbiting radius of dimension d. Then, the compression chambers 8, 8, ... Defined between the wrap portions 5B, 7B are continuously reduced by the swiveling motion, and the air sucked from the suction port 10 is sequentially compressed in the compression chambers 8. While being compressed, this compressed air is discharged from the discharge port 11 to an external air tank or the like to perform a compression action.

[0012]

By the way, in the scroll type air compressor according to the above-mentioned prior art, each end plate 5 is used.
The gap between the compression chambers 8 is sealed by ensuring a proper thrust direction gap δ between the tooth bottoms of A and 7A and the tooth tips of the lap portions 7B and 5B facing each other, and the compressed air is compressed on the low pressure side. It has been prevented from leaking to 8. However, in the fixed scroll 7, the end plate 7A is integrally provided on the inner peripheral side of the cylindrical portion 7C and the overall size is large, and the thrust gap δ is extremely small as compared with the axial size of the fixed scroll 7. Because of the dimensions, when assembling the air compressor,
In order to form a proper thrust direction gap δ between each end plate 5A, 7A and each lap portion 7B, 5B, the fixed scroll 7 and the like must be formed with high processing accuracy, and in particular, the fixed scroll It is necessary to reduce the tolerance of the axial dimension of the scroll 7.

Therefore, according to the above-mentioned conventional technique, it takes a great deal of time to form the fixed scroll 7 with high processing accuracy, and the working efficiency and workability of the working of the fixed scroll 7 are significantly reduced, and the production is reduced. There is a problem that it is low in sex. If the machining accuracy of each fixed scroll 7 varies, the thrust gap δ
Is different from an appropriate value, it is not possible to seal between the compression chambers 8, compressed air leaks, compression efficiency is greatly reduced, and there is a variation in performance among the air compressors. There is a problem that reliability is significantly reduced.

Furthermore, in recent years, scroll type air compressors are widely used in various fields such as home electric appliances and medical machines. For example, when the thrust direction gap δ is changed according to the performance required in each field, the scroll type air compressor is fixed. Since the entire scroll 7 must be newly formed, there is a problem that it is difficult to promptly meet market demands.

The present invention has been made in view of the above-mentioned problems of the prior art. When a fixed scroll is assembled, a proper thrust direction gap can be easily formed between the fixed scroll and the orbiting scroll. An object of the present invention is to provide a scroll type fluid machine capable of improving the work efficiency of a fixed scroll machining operation.

[0016]

The structure adopted by the present invention to solve the above-mentioned problems is a cylindrical casing,
A drive shaft that is rotatably supported on one end side of the tubular portion of the casing and has a tip end side extending into the casing to form a crank, and a crank shaft of the drive shaft that is located inside the casing and is rotatable. And an orbiting scroll in which a spiral wrap portion is erected on the end plate, a support plate disposed on the other end side of the cylindrical portion of the casing, and an inner surface of the support plate facing the orbiting scroll. , A fixed scroll having a spiral wrap portion standing on the end plate, a pressing bolt for pressing the fixed scroll to the orbiting scroll side provided on the support plate, and the fixed scroll turning by the pressing bolt. A fixing bolt that fixes the fixed scroll to the support plate in a state of being pressed to the scroll side, and is provided between the casing and the support plate, and is fixed to the orbiting scroll. A gap adjusting member forming a predetermined thrust direction gap between the scroll, and a mounting bolt for mounting the support plate on the casing through the gap adjusting member.

[0017]

When the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll are combined, when the fixed scroll is pressed toward the orbiting scroll side by the pressing bolt, the tooth tips of the respective wrap portions come to the bottom of the facing end plate. Abutment and the thrust gap between each scroll is substantially zero.
Then, in this state, the fixed scroll is fixed to the supporting plate by the fixing bolt, and the gap adjusting member is fitted between the casing and the supporting plate, and the fixed scroll has the thickness dimension of the gap adjusting member. Away from. Next, when the support plate is attached to the casing by the attachment bolts via the gap adjusting member, a thrust direction gap corresponding to the thickness dimension of the gap adjusting member is formed between the orbiting scroll and the fixed scroll.

[0018]

Embodiments of the present invention will be described below with reference to FIGS. In the embodiment, the same components as those of the conventional technique shown in FIG. 3 described above are designated by the same reference numerals, and the description thereof will be omitted.

In the figure, reference numeral 21 denotes a stepped cylindrical support plate fixed to the other end of the casing 1 in the axial direction, the support plate 21 is formed in a disc shape, and is fixed to the inner surface side thereof to be described later. A bottom portion 22 to which the scroll 25 is detachably arranged, a tubular portion 23 extending from the outer peripheral side of the bottom portion 22 toward the casing 1, and a distal end side of the tubular portion 23 are integrally formed with each mounting bolt. And a cylindrical mounting flange 24 having a stepped shape which is mounted on the flange portion 1D of the casing 1 via the orbiting scroll 9 on the inner peripheral side of the mounting flange 24.
A thrust receiving portion 24A that is in sliding contact with and receives the load in the thrust direction is integrally formed.

Here, the bottom portion 22 of the support plate 21 has
Large diameter communication hole 2 located at the center and communicating with the discharge port 11
2A and a pressing bolt insertion hole 22 which is located radially outside of the communication hole 22A and into which a pressing bolt 27 described later is inserted.
B and a plurality of fixing bolt insertion holes 22C, 22C, ... (One shown in the figure, which are located radially outside of the communication hole 22A and are circumferentially separated from each other and into which fixing bolts 28, 28 ,. ) And are formed.

Reference numeral 25 denotes a fixed scroll according to the present embodiment, which is arranged on the inner surface side of the bottom portion 22 of the support plate 21 so as to face the orbiting scroll 5, and the fixed scroll 25 corresponds to the fixed scroll 7 described in the prior art. Substantially similarly, the end plate 25A provided on the axis O-O of the drive shaft 2 and the end plate 25A
Is roughly composed of a wrap portion 5B of the orbiting scroll 5 and a spiral wrap portion 25B that is erected almost in the same manner, and a discharge port 11 is formed at the center of the end plate 25A. However, the fixed scroll 25 is fastened to the inner surface side of the bottom portion 22 by the respective fixing bolts 28, and is fixed to the casing 1 via the support plate 21. Further, on the back side of the end plate 25A of the fixed scroll 25, a pressing seat 26 formed of a hard material such as a metal material in a disc shape is provided.
It is provided by being embedded in a position corresponding to the pressing bolt insertion hole 22B of the bottom portion 22. Then, the pressing seat 26 is
A load in the thrust direction at the time of pressing by the pressing bolt 27 is received, and the end plate 25A of the fixed scroll 25 is prevented from being deformed and worn at the tip end side of the pressing bolt 27.

Reference numeral 27 denotes a pressing bolt insertion hole 22 in the bottom portion 22.
2 shows a short pressing bolt inserted in B, and the pressing bolt 27 presses the pressing seat 26 in the direction of the arrow A shown in FIG. The fixed scroll 25 is pressed toward the orbiting scroll 5 side.

Reference numerals 28, 28, ... Show a plurality of fixing bolts (only one is shown) inserted into the respective fixing bolt insertion holes 22C of the bottom portion 22, and each of the fixing bolts 28 is, when the fixed scroll 25 is assembled, The fixed scroll 25 is firmly fastened to the inner surface side of the bottom portion 22.

Reference numeral 29 denotes an annular shim as a gap adjusting member which is sandwiched between the flange portion 1D of the casing 1 and the mounting flange 24, and the shim has a predetermined thickness t.
Is formed with. The shim 29 is fixed between the casing 1 and the support plate 21 via the mounting bolts 9 so that the thrust direction gap δ is substantially equal to the thickness dimension t, and the casing 1 and the support plate 21. It is to seal the gap with 21.

The scroll air compressor according to this embodiment has the above-mentioned structure, and its basic operation is not different from that of the prior art. Therefore, next, the assembling method will be described.

First, the drive shaft 2 and the like are mounted in the casing 1, the orbiting scroll 5 is assembled to the crank 2A of the drive shaft 2, and then the fixed scroll 25 and the wrap portion 25 thereof are attached.
B is displaced by a predetermined angle with respect to the wrap portion 5B of the orbiting scroll 5 and engaged with the wrap portion 5B, and then attached to the orbiting scroll 5. Next, after mounting the support plate 21 so as to cover the outer side of the fixed scroll 25, the mounting flange 24 is mounted on the flange portion 1D of the casing 1 by the mounting bolts 9 to fix the support plate 21 to the casing 1. And temporarily stop.

Then, the pressing seat 26 is pressed in the direction of arrow A by the pressing bolt 27 until the tooth tips of the lap portions 5B and 25B come into contact with the tooth bottoms of the facing end plates 25A and 5A as shown in FIG. , The fixed scroll 25 is axially pressed toward the orbiting scroll 5 side, and the fixed scroll 25 is pressed by the respective fixing bolts 28 in this pressed state.
Is firmly fixed to the inner surface side of the bottom portion 22. As a result, the thrust direction gap δ between the tooth bottom of each end plate 5A, 25A and the tooth top of each lap portion 25B, 5B becomes substantially zero.

Next, the mounting bolts 9 are removed, the support plate 21 is once removed from the casing 1, and the casing 1 is removed.
Shim 29 between the flange portion 1D of the
Fit in. Finally, the mounting flange 24 is fastened again to the flange portion 1D of the casing 1 via the shims 29 by the mounting bolts 9 to firmly fix the support plate 21 to the casing 1. As a result, the support plate 21 is axially separated from the casing 1 by the thickness dimension t of the shim 29, and each end plate 5A, 25A and each lap portion 25B, as shown in FIG.
5B, thrust direction gaps δ that are substantially equal to the thickness dimension t are formed.

Thus, according to this embodiment, the support plate 21
Even if the axial length of the scroll slightly varies, by pressing the fixed scroll 25 against the orbiting scroll 5 with the pressing bolt 27, the variation can be easily absorbed and adjusted. It is possible to easily and reliably form an appropriate thrust gap δ between the two portions 25 that is approximately equal to the thickness dimension t of the shim 29. As a result, the support plate 21 and the fixed scroll 25 can be formed with lower processing accuracy than the fixed scroll 7 according to the conventional technique, and the work efficiency of the processing work of the support plate 21 and the like can be effectively increased, Workability and productivity can be greatly improved. Further, even if there is a variation in processing accuracy among the individual support plates 21 and the like, it is possible to easily form a proper thrust direction gap δ in each air compressor, so that a difference occurs in the thrust direction gap δ between each air compressor. Can be effectively prevented, variation in performance between products can be suppressed, and reliability can be significantly improved.

Further, the thrust direction gap δ can be easily changed in accordance with the thickness t by only changing the thickness t of the shim 29. As a result, the scroll type air compressor having the thrust gap δ according to the market demand can be promptly produced without newly forming the support plate 21 and the like, and the support plate 21 and the fixed scroll 2 are provided.
5 can be standardized, and it is possible to effectively cope with product type changes and the like.

In the above embodiment, the shim 29 as the gap adjusting member is formed in an annular shape, but instead of this, a plurality of fan-shaped shims such as two-division and three-division may be used. .. In this case, a sealing member such as an O-ring is provided between the flange portion 1D of the casing 1 and the mounting flange 24, and the casing 1 is sealed by the sealing member.
A configuration may be adopted in which a space between the support plate 21 and the support plate 21 is sealed.

In the above embodiment, the mounting flange 24 is integrally formed on the tip side of the cylindrical portion 23 of the support plate 21, but instead of this, the cylindrical portion 23 and the mounting flange 24 are separated. Alternatively, the two may be integrated by using a fixing means such as welding or adhesion.

Furthermore, in the above-mentioned embodiment, the oil-free scroll type air compressor has been described as an example of the scroll type fluid machine, but the present invention is not limited to this and, for example, an oil cooling type scroll type fluid machine. It can also be applied to machines,
It can also be used as a vacuum pump.

Furthermore, the scroll type fluid machine of the present invention can be widely applied to the compression of refrigerants such as CFC gas and industrial gases such as nitrogen gas as compressed gas.

[0035]

As described above in detail, according to the present invention, the wrap portion of the fixed scroll and the wrap portion of the orbiting scroll are combined, and the fixed scroll is pressed toward the orbiting scroll side by the pressing bolt, and each scroll is scrolled. In the state where the gap in the thrust direction between the two is substantially zero, the fixed scroll is fixed to the supporting plate by the fixing bolt, and the gap adjusting member is fitted between the casing and the supporting plate,
By mounting the support plate to the casing with the mounting bolts via the gap adjusting member, a thrust direction gap corresponding to the thickness dimension of the gap adjusting member can be easily formed between the orbiting scroll and the fixed scroll. it can.

As a result, the support plate and the fixed scroll can be formed with a low processing accuracy, the work efficiency of the processing work of these support plates and the like can be effectively increased, and the workability and the productivity can be improved. .. Further, even if there is variation in processing accuracy among individual support plates, etc., an appropriate thrust direction gap can be formed in each scroll fluid machine, so it is effective to create a difference in thrust direction gap between individual products. Therefore, it is possible to prevent variations in performance among products, and improve reliability. Furthermore, since the thrust direction gap can be easily changed only by changing the thickness dimension of the gap adjusting member, a scroll type air gap having a thrust direction gap that meets market demands can be obtained without newly forming a support plate or the like. The compressor can be quickly produced, and it is possible to effectively cope with product type changes.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing a completed state of a scroll air compressor according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a scroll air compressor showing a state in which a fixed scroll is pressed against the orbiting scroll side.

FIG. 3 is a vertical cross-sectional view of a scroll air compressor according to the related art.

[Explanation of symbols]

 1 Casing 1C Cylindrical part (cylindrical part) 2 Drive shaft 2A Crank 5 Orbiting scroll 5A, 25A End plate 5B, 25B Lap part 9 Mounting bolt 21 Support plate 25 Fixed scroll 27 Pressing bolt 28 Fixing bolt 29 Shim (gap adjusting member)

Claims (1)

[Claims] 1. A tubular casing, a drive shaft rotatably supported at one end side of a tubular portion of the casing, and a tip end side extending into the casing to form a crank, and located in the casing. And a supporting plate disposed on the other end side of the cylindrical portion of the casing, and the supporting plate is rotatably provided on the crank of the drive shaft, and a spiral wrap portion is erected on the end plate. A fixed scroll, which is disposed on the inner surface side of the so as to face the orbiting scroll, and in which a spiral wrap portion is erected on the end plate, and a pressing bolt which is provided on the support plate and presses the fixed scroll to the orbiting scroll side. A fixing bolt for fixing the fixed scroll to a supporting plate in a state where the fixed scroll is pressed to the orbiting scroll side by the pressing bolt, and the casing and the supporting plate. A scroll including a gap adjusting member that is provided between the orbiting scroll and the fixed scroll and forms a predetermined thrust direction gap, and a mounting bolt that attaches a support plate to the casing via the gap adjusting member. Fluid machine.