JPH04103202U - scroll type fluid machine - Google Patents

Abstract

(57) [Summary] [Purpose] To accurately regulate the flying height of the fixed scroll 1. [Structure] A through hole 91 is bored in the flange 14 of the fixed scroll 1, and a stopper bolt 92 passing through the through hole 91 is screwed onto the fixed scroll 6, so that the lower surface of the stopper bolt 92 and the upper surface of the fixed case 6 are connected to each other. A predetermined gap is formed between them.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

The present invention relates to a scroll type fluid machine used as a compressor or an expander.

0002

[Conventional technology]

An example of a conventional scroll-type fluid machine is shown in FIGS. 3 and 4. 8 is a sealed housing, which includes a cylindrical housing 8a and an upper part that closes the upper part of the housing. Consists of Uzing 8b. The inside of this sealed housing 8 is a discharge cover 31. It is partitioned into a high pressure side 44 and a low pressure side 45 by. The upper edge of the cylindrical housing 8a is This discharge cover is butt welded to the bottom surface of the discharge cover 31. The lower edge of the upper housing 8b is butt welded to the upper surface of the upper housing 8b. Inside the low pressure side 45, there is a scroll type compression mechanism C at the top and an electric motor at the bottom. M are arranged, and these are interlocked and connected to each other via a rotating shaft 5. The electric motor M consists of a rotor Ma and a stator Mb, and the rotor Ma is connected to a rotating shaft 5. The stator Mb is fixed by being press-fitted into the cylindrical housing 8a. There is.

0003 The scroll type compression mechanism C includes a fixed scroll 1 and an orbiting scroll 2. Ru. The fixed scroll 1 includes an end plate 11 and a spiral wrap 12 erected on the inner surface of the end plate 11. A discharge port 13 is provided in the center of this end plate 11. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 erected on the inner surface of the end plate 21. , a drive bush 54 has a swing bearing 73 in a boss 23 erected on the outer surface of this end plate 21. A slide hole 55 drilled in this drive bush 54 is rotatably fitted through the drive bush 54. An eccentric pin 53 protruding from the upper end of the rotating shaft 5 is slidably fitted inside. There is.

0004 The fixed scroll 1 and the orbiting scroll 2 are eccentric from each other by a predetermined distance, and A plurality of sealed spaces 24 are formed by interlocking with each other with angles shifted by 180°. ing. The orbiting scroll 2 slides automatically onto a casing 6 fixed in a closed housing 8. The orbiting scroll 2 is supported between the orbiting scroll 2 and the casing 6. Rotation barrier consisting of Oldham link etc. that allows rotational movement but prevents rotation. A stop mechanism 3 is provided.

[0005] A flange 14 formed on the outer periphery of the fixed scroll 1 and protruding from the upper end of the casing 6 A support spring 32 in the form of a thin plate is disposed between the legs 6b, and both ends of the support spring 32 are connected to the bolts. The central part is fastened to the flange 14 by a bolt 36, and the center part is fastened to the leg 6b by a bolt 37. It is. In this way, the fixed scroll 1 can float freely via the support spring 32. It is supported by the casing 6. On the back side of the end plate 11 of the fixed scroll 1, there is a concentric cylindrical flap centered at its center. screws 15 and 16 are provided to protrude upward, and the discharge cover 31 is placed between them. A cylindrical flange 39 protruding downward from the lower surface is fitted in a sealed and slidable manner. As a result, an intermediate pressure chamber 40 surrounded by these is formed, and this intermediate pressure chamber 40 communicates the gas with the closed space 24 in the process of being compressed through the pressure guiding hole 41 drilled in the end plate 11. ing. A high pressure chamber 42 is formed on the inner circumferential side of this intermediate pressure chamber 40, and A low pressure chamber 43 is formed on the circumferential side.

[0006] The upper end of the rotating shaft 5 is supported by an upper bearing 71 provided in the casing 6, and the lower end The lower end is supported by a lower bearing 72 provided on the stay 33, and the lower end is supported by a slug fixed to the stay 33. It is supported by a top plate 75. And in the middle part of this rotating shaft 5 The balance weight 34 is fixed. Casing 6 and stay 33 are fixed pins 35 to the cylindrical housing 8a.

[0007] By driving the electric motor M, the rotating shaft 5, the eccentric pin 53, and the drive The orbiting scroll 2 is driven by an orbiting drive mechanism consisting of a bush 54, a boss 23, etc. The orbiting scroll 2 revolves while being prevented from rotating by the rotation prevention mechanism 3. It revolves around a circular orbit with the radius as its radius. Then, the gas enters the low pressure chamber 45 through the suction pipe 82 and is sealed via a path not shown. is drawn into the space 24. Then, due to the orbiting movement of the orbiting scroll 2, the airtight air is opened. As the volume of the space 24 decreases, it is compressed and reaches the center, and from the discharge port 13. It enters the high pressure side 44 via the high pressure chamber 42 and from here the discharge pipe 83 and the non-return check built in therein. The valve 84 is pushed open and the water is discharged to the outside. At this time, the gas in the high pressure chamber 42 and intermediate pressure chamber 40 is The fixed scroll 1 is pressed against the orbiting scroll 2 by the pressure of the gas, and the closed space is closed. 24 to suppress gas leakage from inside. When liquid is sucked into the sealed space 24, the fixed scroll 1 floats up and absorbs the liquid. This prevents the scroll type compression mechanism C from being damaged.

[0008] At the same time, the lubricating oil stored in the oil reservoir 81 at the bottom of the sealed housing 8 is released from the rotating shaft. It is sucked up from the lower end of the shaft 5 using centrifugal force, and is drilled into the rotating shaft 5. The eccentric pin 53, upper bearing 71, rotation prevention mechanism 3, slewing bearing 73, etc. After lubricating the sliding parts, the oil returns to the oil reservoir 81 via the pipe 61 and is stored there. In the figure, 85 is a temperature sensor for detecting the temperature of the discharged gas, and 86 is this temperature sensor. A cover 87 covering this is a glass-sealed terminal for supplying power to the electric motor M.

[0009]

[Problem that the idea aims to solve]

In the above conventional scroll type fluid machine, the upper end surface of the cylindrical flange 15 is The floating height of the fixed scroll 1 is controlled by bringing it into contact with the lower surface of the charge cover 31. However, this floating height is determined by the addition of fixed scroll 1 and discharge cover 31. Because it is affected by machining accuracy and assembly accuracy, there is large variation, so it is necessary to improve its reliability. In order to achieve this, high processing and assembly precision is required, which raises the problem of increased costs. there were.

0010

[Means to solve the problem]

This invention was proposed to solve the above problems, and its gist is as follows: However, each fixed scroll is made up of a spiral wrap on the inner surface of the end plate. and an orbiting scroll are interlocked with each other, and the fixed scroll is provided on the outer periphery of the fixed scroll. The support spring installed between the flange and the casing supports the casing so that it can float freely. At the same time, it is introduced into the back pressure chamber formed on the back side of the end plate of this fixed scroll. The scroll is pressed toward the orbiting scroll by fluid pressure. In a le-type fluid machine, the flange of the fixed scroll is attached to the center of the end plate. Through-holes are provided in at least two symmetrical locations, and the above-mentioned A stopper part that is attached to the casing and has a predetermined gap between it and the above flange. A scroll-type fluid machine characterized by being provided with a material.

[0011]

[Effect]

In this invention, since the above structure is provided, the flange becomes the stopper member. The flying height of the fixed scroll is regulated by this contact.

0012

【Example】

One embodiment of the invention is shown in FIGS. 1 and 2. The flange 14 provided on the outer periphery of the fixed scroll 1 has a flange 14 symmetrical with respect to the center of the end plate 11. Through holes 91 are provided in at least two locations. On the other hand, it protrudes upward from the outer circumference of the upper end of the casing 6 fixed to the cylindrical housing 8a. A stopper member 92 such as a bolt is screwed into the leg 6a through each of the through holes 91. ing. This stopper member 92 is located between the lower surface of the stopper member 92 and the upper surface of the flange 14. The amount of screwing is adjusted so that a predetermined gap δ is formed. Therefore, when liquid is sucked into the sealed space 24, that is, when liquid is compressed, the fixed The crawl 1 floats up, but at that time, the upper surface of the flange 14 becomes the lower surface of the stopper member 92. The flying height is regulated by contacting with. The other configurations are similar to the conventional ones shown in FIGS. 3 and 4.

[0013]

[Effect of the idea]

In this invention, a through hole is provided in the flange of the fixed scroll, and this A stopper member that passes through the through hole is attached to the casing, so the fixed scroll The floating height can be set by the gap between the stopper member and the flange. Therefore, the flying height can be regulated easily, inexpensively, and with high precision.

[Submission date] April 22, 1991

[Procedural amendment 1]

[Name of document to be amended] Specification

[Correction target item name] 0006

[Correction method] Change

[Correction details]

The upper end of the rotating shaft 5 is supported by an upper bearing 71 provided on the casing 6, the lower end is supported by a lower bearing 72 provided on the stay 33, and the lower end is supported by a thrust plate 75 fixed to the stay 33. ing. A balance weight 34 is fixed to the rotor Ma of the electric motor . The casing 6 and the stay 33 are fixed to the cylindrical housing 8a by a fixing pin 35.

[Brief explanation of drawings]

FIG. 1 is a partial vertical sectional view taken along line BB in FIG. 2, showing one embodiment of the present invention.

FIG. 2 is a sectional view corresponding to FIG. 4 showing one embodiment of the present invention.

FIG. 3 is a longitudinal sectional view of a conventional scroll-type fluid machine.

FIG. 4 is a sectional view taken along line AA in FIG. 3;

[Explanation of symbols]

14 Flange 91 Through hole 92 Stopper member 6 Casing δ gap

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[Procedural amendment]

[Submission date] April 22, 1991

[Procedural amendment 2]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 3

[Correction method] Change

[Correction details]

[Figure 3]

Claims (1)

[Scope of utility model registration request] [Claim 1] A fixed scroll and an orbiting scroll each having a spiral wrap erected on the inner surface of an end plate are engaged with each other, and the fixed scroll is disposed between a flange provided on the outer periphery of the fixed scroll and a casing. In a scroll-type fluid machine, the fixed scroll is supported so as to float freely by a supporting spring and is pressed toward the orbiting scroll by fluid pressure introduced into a back pressure chamber formed on the back side of the end plate of the fixed scroll. , through holes are provided in the flange of the fixed scroll at at least two locations symmetrical with respect to the center of the end plate, and a predetermined gap is set between the through hole and the flange. A scroll-type fluid machine characterized by being provided with a stopper member.