JPH04103201U - Closed scroll type fluid machine - Google Patents

Abstract

(57) [Summary] [Purpose] To reduce the number of welding steps for the cylindrical housing 8a, upper housing 8b, and discharge cover 31. [Structure] The outer flange portion 31a of the discharge cover 31 is fitted to the outer or inner periphery of the upper end of the cylindrical housing 8a, and the lower end of the upper housing 8b is fitted to the outer periphery or the inner periphery of the cylindrical housing 8a. Weld all at once in one weld.

Description

[Detailed explanation of the idea]

0001

[Industrial application field]

This invention relates to a closed scroll type fluid machine used as a compressor or an expander. do.

0002

[Conventional technology]

3 and 4 show an example of a conventional closed scroll type fluid machine. 8 is a sealed housing consisting of a cylindrical housing 8a and an upper housing that closes the upper part of the housing 8a. Consists of Zing 8b. The inside of this sealed housing 8 is a discharge cover 31. Therefore, it is partitioned into a high pressure side 44 and a low pressure side 45. 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 end edge of the upper housing 8b is butt welded to the upper surface of the upper housing 31. 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 33. 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 and absorbs the liquid. By letting it escape, damage to the scroll type compression mechanism C is prevented.

[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 top surface of the discharge cover 31 The lower edge of the upper housing 8b is butt-welded to the upper housing 8b, and a cylindrical housing is The upper edge of ring 8b is butt welded, which increases welding time and costs. There was a problem that it was bulky.

0010

[Means to solve the problem]

This invention was proposed to solve the above problems, and its gist is as follows: However, it is equipped with a cylindrical housing and an upper housing that closes the upper part. A discharge cover is provided to separate the inside of the sealed housing into high pressure side and low pressure side. A fixed scroll and an orbiting scroll are interlocked and housed on the low pressure side, and the upper The fixed scroll is levitated to a casing fixedly installed in the sealed housing. between the back of the end plate of this fixed scroll and the discharge cover. A high pressure chamber, an intermediate pressure chamber, and a low pressure chamber are formed in sequence from the center in the radial direction. is a closed type scroll that rotates the orbiting scroll while preventing its rotation. In the roll type fluid machine, the above-mentioned disc is attached to the outer periphery or inner periphery of the upper end of the cylindrical housing. Fit the outer flange of the charge cover, and then The lower end of the upper housing was fitted around the periphery and the three parts were welded together at once. This is a closed scroll type fluid machine.

[0011]

[Effect]

In the present invention, since the above structure is provided, the upper end of the cylindrical housing and the distal end of the cylindrical housing are The outer flange of the charge cover and the lower end of the upper housing are welded once. Welded all at once.

0012

【Example】

One embodiment of the invention is shown in FIG. The outer periphery flange 31a of the discharge cover 31 is attached to the outer periphery of the upper end of the cylindrical housing 8a. and fit the lower end of the upper housing 8b to the outer periphery of this outer flange portion 31a. These three parts are welded together by welding 50 from diagonally downward. As shown in FIG. 2, a discharge cover 31 is installed on the inner periphery of the upper end of the cylindrical housing 8a. The outer peripheral flange part 31a is fitted, and the upper housing is attached to the inner periphery of this outer peripheral flange part 31a. The lower ends of the rings 8b are fitted together and these three parts are welded together by welding 51 from diagonally above. Can also be done.

[0013]

[Effect of the idea]

In this invention, a discharge cover is provided on the outer or inner periphery of the upper end of the cylindrical housing. Fit the outer peripheral flange of the Because these three parts were welded together by fitting the lower ends of the housings, one welding from one direction was required. Because three parts can be welded at once, welding work is easier than with conventional methods. Both reduce welding man-hours and reduce costs.

[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 longitudinal sectional view showing a first embodiment of the present invention.

FIG. 2 is a partial vertical sectional view showing a second embodiment of the present invention.

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

FIG. 4 is a longitudinal sectional view of a conventional scroll-type fluid machine.

[Explanation of symbols]

8 Closed housing 8a cylindrical housing 8b upper housing 31 Discharge cover 44 High pressure side 45 Low pressure side 1 Fixed scroll 11 End plate 2 Orbital scroll 6 Casing 42 Hyperbaric chamber 40 Intermediate pressure chamber 43 Low pressure chamber 50 welding

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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 1

[Correction method] Change

[Correction details]

[Figure 1]

[Procedural amendment 3]

[Name of document to be corrected] Drawing

[Correction target item name] Figure 4

[Correction method] Change

[Correction details]

[Figure 4]

Claims (1)

[Scope of utility model registration request] Claim 1: A discharge cover is provided to partition the inside of a closed housing including a cylindrical housing and an upper housing that closes the upper part into a high pressure side and a low pressure side, and a fixed scroll and an orbiting scroll are engaged with each other on the low pressure side. The fixed scroll is supported so as to float freely on a casing fixedly installed in the sealed housing, and a high voltage is applied between the back of the end plate of the fixed scroll and the discharge cover in a radial direction from the center. In a closed scroll type fluid machine that forms a chamber, an intermediate pressure chamber, and a low pressure chamber and rotates the orbiting scroll while preventing its rotation, the outer periphery of the discharge cover is provided on the outer periphery or inner periphery of the upper end of the cylindrical housing. A closed scroll type fluid machine, characterized in that the flange portions are fitted, the lower end of the upper housing is fitted on the outer periphery or the inner periphery of the outer periphery flange portion, and the three parts are welded together at once.