JPH06241177A - Scroll type fluid machinery - Google Patents

Abstract

PURPOSE:To reduce manufacturing cost, and to facilitate assembly by fixing support springs to the under surface of a flange formed on the outer periphery of a fixed scroll, and to the upper surface of a leg protruded to the upper part of the outer periphery of a frame. CONSTITUTION:A discharge cover 31 dividing a sealed housing 8 into a high pressure side and a low pressure side, is provided, while a fixed scroll 1 and a revolving scroll 2 are stored in the low pressure side in such a manner that both of the scrolls bite with one another. The fixed scroll 1 is supported so that it can be freely floated, on the frame 6 fixed in the sealed housing 8, through a support spring 32. The support springs 32 are fixed to the under surface of a flange 14' formed on the outer periphery of the fixed scroll 1, and to the upper surface of a leg 6' protruded to the upper part of the outer periphery of the frame 6. The length of the leg 6b' can be shortened, while the working accuracy for the thickness and the like of the flange 14' cannot be improved in terms of maintenance of the horizontal fitting position of the supporting spring 32.

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 used as a compressor or an expander.

[0002]

2. Description of the Related Art FIG. 2 is a vertical cross-sectional view of a conventional scroll compressor, and FIG. 3 is an exploded perspective view of main parts of the upper part of the compressor.
FIG. 4 is an exploded perspective view of the main parts of the middle part and the lower part of the compressor. In the figure, the inside of the closed housing 8 is provided with a discharge cover 31 so that a high pressure side 44 and a low pressure side 45 are formed.
It is divided into Inside the low voltage side 45, a scroll type compression mechanism C is arranged at the upper part thereof, and an electric motor M is arranged at the lower part thereof, which are interlockingly connected to each other via a rotary shaft 5.

The scroll compression mechanism C comprises a fixed scroll 1 and an orbiting scroll 2. The fixed scroll 1 includes an end plate 11 and a spiral wrap 1 standing on the inner surface of the end plate 11.
2 and a discharge port 13 is provided at the center of the end plate 11.
Is provided. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21, and a drive bush 54 is freely rotatable in a boss 23 provided on the outer surface of the end plate 21 via an orbiting bearing 73. An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is slidably fitted into a slide hole 55 formed in the drive bush 54.

The orbiting scroll 2 is slidably supported on a frame 6 fixed in a closed housing 8,
Between the orbiting scroll 2 and the frame 6, a rotation preventing mechanism 3 such as an Oldham link which allows the orbiting motion of the orbiting scroll 2 but prevents its rotation is disposed.

The fixed scroll 1 and the orbiting scroll 2 are eccentric with respect to each other by a predetermined distance, and are engaged with each other by shifting them by an angle of 180 degrees so that a plurality of closed spaces 2 are formed.
4 are formed.

Between the flange 14 formed on the outer circumference of the fixed scroll 1 and the leg 6b protruding from the upper end of the frame 6, a thin plate-shaped support spring is provided on the same surface as the inner surface of the end plate 11 of the fixed scroll 1. The support spring 32 is fastened and fixed to the flange 14 by a bolt 36 and to the leg 6b by a bolt 37, respectively. In this way, the fixed scroll 1 is supported by the frame 6 so as to be able to float via the support spring 32, can be displaced in the vertical direction within a predetermined range, and can be displaced within a predetermined angle range with reference to the mounting surface of the support spring 32. It can be tilted.

Further, the overhanging portion 1 is provided on the outer circumference of the fixed scroll 1.
6 is formed, and the projecting portion 16 is provided with a pin hole 16a for fixing the fixed scroll 1 when the fixed scroll 1 is processed.

An intermediate pressure chamber 40 is formed between the rear surface of the end plate 11 of the fixed scroll 1 and the lower surface of the discharge cover 31. The intermediate pressure chamber 40 has a closed space 2 in the middle of gas compression through a pressure guiding hole 41 formed in the end plate 11.
It communicates with 4. A high pressure chamber 42 is formed on the inner peripheral side of the intermediate pressure chamber 40, and a low pressure chamber 43 is formed on the outer peripheral side. The upper end of the rotating shaft 5 is supported by an upper bearing 71 provided on the frame 6, and the lower end thereof is a lower bearing 72.
It is supported by.

By driving the electric motor M, the orbiting scroll 2 is driven by a revolving orbiting mechanism including a rotating shaft 5, an eccentric pin 53, a drive bush 54, a boss 23, etc., and the orbiting scroll 2 is rotated by a rotation preventing mechanism 3. While being blocked, it makes an orbital revolving motion on a circular orbit whose radius is the revolution radius. Then, the gas becomes the suction pipe 8
2 into the low pressure side 45, and is sucked into the closed space 24 from the low pressure chamber 43 through the passage 85. Then, as the volume of the closed space 24 decreases due to the orbiting motion of the orbiting scroll 2, the airtight space 24 is compressed and reaches the central portion, and enters the high pressure side 44 from the discharge port 13 through the high pressure chamber 42, and from there, the discharge pipe 83. Is discharged to the outside. On this occasion,
A back pressure load based on the gas pressures in the high pressure chamber 42 and the intermediate pressure chamber 40 acts on the fixed scroll 1, and the fixed scroll 1 is pressed against the orbiting scroll 2 so that the closed space 24
Prevents gas from leaking from inside. When the liquid is sucked into the closed space 24, the fixed scroll 1 supports the support spring 3
The scroll type compression mechanism C is prevented from being damaged by floating through 2 and letting out the liquid.

[0010]

In the conventional scroll type fluid machine described above, the support spring 32 is provided on the upper surface of the flange 14 formed on the outer periphery of the fixed scroll 1 and the frame 6.
Since they are respectively fixed to the legs 6b projecting from the upper end of the frame, the legs 6b become long, the amount of material of the frame 6 increases, the number of processing steps increases, and the support spring 32 is installed horizontally. In order to maintain the above, it is necessary to increase the processing accuracy such as the thickness of the flange 14 and the cost is increased, or the overhanging portion 16 is formed by the legs 6b and 6b during assembly.
Since it has to be installed in a narrow space between and, there was a problem such as deterioration of assembly.

The present invention eliminates the above-mentioned drawbacks of the prior art and eliminates the need to shorten the leg length to reduce the number of processing steps and increase the processing accuracy of the flange for keeping the posture of the support spring horizontal. Therefore, it is intended to reduce the manufacturing cost and facilitate the assembly by these.

[0012]

DISCLOSURE OF THE INVENTION The present invention is to solve the above-mentioned problems and provides a discharge cover for partitioning the closed housing into a high pressure side and a low pressure side, and a fixed scroll and an orbiting scroll on the low pressure side. The fixed scroll is supported by a frame fixedly installed in the hermetically sealed housing via a support spring so that the fixed scroll is floated between them, and an intermediate pressure chamber is provided between the back surface of the fixed scroll and the discharge cover. In the scroll type fluid machine which is formed and presses the fixed scroll toward the orbiting scroll by the fluid pressure in the middle of compression, which is introduced into the intermediate pressure chamber, the support spring is formed on the outer periphery of the fixed scroll. Fixed to the lower surface of the flange and the upper surface of the leg protruding above the outer periphery of the frame. It relates scroll fluid machine according to claim.

[0013]

Since the present invention has the above-mentioned structure, it has the following functions. That is, by fixing the supporting springs to the lower surface of the flange formed on the outer circumference of the fixed scroll and the upper surface of the leg protruding from the upper outer circumference of the frame, the length of the leg can be shortened and the arrangement of the supporting spring can be reduced. In order to keep the installation posture horizontal, it is not necessary to increase the processing accuracy such as the thickness of the flange.

[0014]

1 is a partial vertical sectional view showing a main part of a scroll type compressor according to an embodiment of the present invention. In the figure, 14 'is a flange formed on the outer periphery of the fixed scroll 1. The flange 14 'is provided near the lower end surface of the fixed scroll in the posture shown. In this example, the flange 14 'is set such that the lower surface thereof is flush with the tip of the spiral wrap 12 of the fixed scroll 1.

Reference numeral 6 is a frame, 6b 'is a leg which is provided to project upward from the outer peripheral portion of the frame and which is shorter than before, and 32 is provided between the lower surface of the flange 14' and the upper surface of the leg 6b '. It is a thin plate-shaped support spring arranged.
That is, the support spring 32 is used in the bolt 3 in the opposite direction to the conventional one.
6'is fastened and fixed to the lower surface of the flange 14 'and to the upper surface of the leg 6b' by bolts 37 in the same direction as the conventional one, and the fixed scroll 1 is supported by the frame 6 via the support spring 32 so as to be able to float. ing.

The structure of this embodiment is different from the conventional structure in that the flange 14 'is provided near the lower end surface of the fixed scroll 1,
The legs 6b 'are shortened and the support springs 32 are attached to the flanges 14'.
Is attached to the lower surface of the leg by a bolt 36 'screwed in the opposite direction to the conventional one, and is attached to the upper surface of the shortened leg 6b' by a bolt 37 in the same direction as the conventional one. The structure and operation of the parts other than the above are similar to those of the conventional one shown in FIGS. 2 to 4, and corresponding members are designated by the same reference numerals.

Since the length of the leg 6b 'can be shortened by arranging one of the fixing points of the support spring 32 on the lower surface of the flange 14', the amount of material of the frame 6 can be reduced and the number of processing steps can be reduced. In addition, as the length of the leg 6b 'is shortened, the overhanging portion 16 is located above the leg 6b', and as a result, the overhanging portion 16 is moved to the legs 6b 'and 6b' during assembly. It doesn't have to be installed in the narrow space with. Furthermore, it is not necessary to increase the processing accuracy such as the thickness dimension and the parallelism of the flange 14 'in order to keep the mounting posture of the support spring 32 horizontal. The lower the forming position of the flange 14 'is, the shorter the length of the leg 6b' described above and the thinner the flange 14 'can be.

[0018]

In the scroll type fluid machine of the present invention, since the supporting springs are fixed to the lower surface of the flange formed on the outer circumference of the fixed scroll and the upper surface of the leg projecting above the outer circumference of the frame, the manufacturing cost is reduced. Can be reduced and the assembling can be facilitated.

[Brief description of drawings]

FIG. 1 is a partial vertical cross-sectional view of a scroll compressor according to an embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view of a conventional scroll compressor.

FIG. 3 is an exploded perspective view of main parts of an upper portion of the conventional scroll compressor.

FIG. 4 is an exploded perspective view of main parts of a middle part and a lower part of the conventional scroll type compressor.

[Explanation of symbols]

 1 Fixed Scroll 2 Orbiting Scroll 6 Frame 6b, 6b 'Leg 8 Sealed Housing 14, 14' Flange 16 Overhang 24 Sealed Space 31 Discharge Cover 32 Support Spring 40 Intermediate Pressure Chamber 41 Pressure Guide Hole

Front Page Continuation (72) Inventor Tetsuro Eida 3-1, Asahi-cho, Nishibiwajima-cho, Nishikasugai-gun, Aichi Prefecture 3-1-3 Mitsubishi Heavy Industries, Ltd. Air-conditioner factory (72) Inventor Nao Mizuno 3 Asahi-cho, Nishibashijima-cho, Nishikasugai-gun, Aichi Prefecture 1-chome, Mitsubishi Heavy Industries, Ltd. Air Conditioning Factory

Claims (1)

[Claims] 1. A discharge cover for partitioning a sealed housing into a high pressure side and a low pressure side is provided, and a fixed scroll and an orbiting scroll are engaged with each other and housed on the low pressure side, and the fixed scroll is fixed in the sealed housing. The installed frame is supported by a support spring so that it can float freely, and an intermediate pressure chamber is formed between the back surface of the fixed scroll and the discharge cover, and the fluid pressure in the middle of compression introduced into the intermediate pressure chamber. In the scroll type fluid machine in which the fixed scroll is pressed toward the orbiting scroll by the above, the lower surface of the flange in which the support spring is formed on the outer circumference of the fixed scroll and the upper surface of the leg projecting above the outer circumference of the frame are provided. A scroll type fluid machine characterized by being fixed to each.