JPS6138181A - Securing of compressor pump assembly - Google Patents

Abstract

PURPOSE:To secure a pump assembly easily in a casing under non-deformed condition by integrating an annular frame having the outer diameter approximately same with the inner diameter of casing and lower rigidity than that of the pump assembly while centering with said assembly and securing in the casing. CONSTITUTION:An annular frame 10 having the outer diameter approximately same with the inner diameter of casing 1 and lower rigidity than that of a pump assembly 3 is fixed to said assembly 3 while centering thus to secure the annular frame 10 integrated with the pump assembly 3 in the casing 1. Here, the casing 1 is heated to shrinkage fit said frame 10 over the casing 1 and to weld the frame 10 to the innercircumference of casing 1 through arc spot or electron beam welding from the outside of casing 1. Since the rigidity of the frame 10 is lower than that of the pump assembly 3, welding stress is absorbed by the frame 10 to never deform the assembly 3. Consequently, the assembly 3 can be secured easily in the casing 1 without deformation.

Description

DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in a pump assembly fixing method for fixing a pump assembly of a compressor such as a rotary compressor or a scroll compressor to a casing.

[Technical background of the invention and its problems]

FIG. 2 shows an example of a conventional method for fixing a pump assembly, in which the pump assembly 3 connected to the motor 2 within the casing 1 has an outer diameter of its cylinder 4 equal to the inner diameter of the casing 1. The pump assembly 3 was fitted into the casing 1, and the casing 1 and cylinder 4 were fixed from the outside of the casing 1 by arc spot welding.

However, in this fixing method, the bomb assembly 3 is pulled in one direction of the casing due to the heat and stress generated during arc welding, and the blade slot (not shown) of the pump assembly 3 is greatly deformed. Furthermore, the accuracy of the bearing deteriorates, causing failures such as locking.

FIG. 3 shows a conventional method of fixing a pump assembly, in which an annular frame 5 is fixed in advance within the casing 1 by arc spot welding from the outside of the casing 1.
Attach the pump assembly 3 to this frame 5 with bolts 6.6...
・It was fixed by

However, in such a fixing method, when fixing the pump assembly 3 to the frame 5, the shaft 7 of the pump assembly 3 must be aligned with the stator 8 of the motor 2, and for this adjustment, the casing 1 must be composed of three parts: a body part 1A, both lid parts IB, and an IC. Further, when the frame 5 is welded to the casing 1, the frame 5 may be deformed due to heat and stress, and the inner circumference of the frame 5 may become out of roundness.

[Purpose of the invention]

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a method for fixing a pump assembly of a compressor, which allows the pump assembly to be easily fixed in a casing without deforming the pump assembly. shall be.

[Summary of the invention]

The present invention provides a pump assembly fixing method for a compressor in which a pump assembly consisting of a cylinder, a shaft, etc. is fixed in a casing. The pump assembly is characterized in that several parts are attached to the pump assembly so as to be aligned with the assembly, and an annular frame integrated with the pump assembly is fixed within the casing.

[Embodiments of the invention]

The present invention will be explained below with reference to embodiments shown in the drawings.

FIG. 1 shows a pump assembly 3 fixed in a casing 1 according to the present invention. According to the present invention, the casing 1 only needs to be composed of a main body 1o and an upper lid part 1B.

In FIG. 1, the pump assembly 3 is composed of a cylinder 4, upper and lower bearings 8, 9, a shaft 7 supported by these bearings 8, 9, blades (not shown), rollers, etc. 8 and 9 are bolts 6.
6... are connected. The outer diameter of the cylinder 4, which has a larger diameter than both the bearings 8 and 9, is smaller than the inner diameter of the casing 1, and the cylinder 4 and the casing 1 are spaced apart from each other.

On the other hand, the frame 10 attached to the pump assembly 3 is
It has an annular shape with an L-shaped cross section, and specifically consists of a vertical annular peripheral wall 11 and a horizontal annular support plate 12 connected to the inside of the lower end of the annular peripheral wall 11. . Further, in this annular support plate portion 12, a plurality of openings (not shown) for inserting bolts are formed at intervals in the circumferential direction. Furthermore, the outer diameter of the annular peripheral wall 11 is approximately equal to the inner diameter of the casing 1, and furthermore, the rigidity of the frame 10 is made much weaker than that of the pump assembly 3.

To fix the pump assembly 3 using such a frame 10, first, bolts 6.
6... Attach the frame 10 to the pump assembly 3. At this time, the outer periphery of the annular peripheral wall 11 of the frame 10 and the shaft 7 are aligned simultaneously. Note that the rotating shaft 13 and rotor 14 of the motor 2 are attached to the shaft 7 in advance.

Next, the pump assembly 3 is also installed outside the casing 1.
is set on a jig (not shown) together with the stator 15 of the motor 2, and the rotor 14 and stator 15 are aligned using a mandrel or a gap gauge.

Thereafter, the main body 1D of the casing 1 with the top lid 1B removed is heated, and the frame 10 integrated with the motor 2 and the pump assembly 3 is inserted into the main body 1D and shrink-fitted. Furthermore, the frame 10 is welded to the inner circumference of the casing 1 from the outside of the casing 1 by arc spot welding, laser irradiation, electron beam welding, or the like. The heat and stress generated during this welding pulls the frame 10 toward the casing 1, but since the rigidity of the frame 10 is much weaker than that of the pump assembly 3, the stress of welding is absorbed by the deformation of the frame 10. Ru. The amount of deformation of this frame 10 is several μT.
Although a variation of about rL~100 μm occurs, even in this case, the pump assembly 3 does not become deformed.

Among the welding methods described above, spot welding using laser irradiation is optimal. The reason for this is that in the case of laser irradiation, the spot is localized and the stress is overwhelmingly lower than that in arc spot welding.

Note that the jig is removed after welding is completed.

As described above, according to the method of this embodiment, the deformation (2) of the pump assembly 3 is small, and the pump assembly 3 and the frame 1 are
Alignment with zero is also easy. Further, the casing 1 can be assembled by simply dividing it into two parts, and the welding position of the upper cover 1B to the casing body 1D is far away from the frame 10, so that the influence of the heat of this welding on the frame 10 is small.

Note that by using the same type of steel plate as the casing 1 for the frame 10, the melt bonding force between the base metals becomes stronger, the two can be welded with a minimum input, and the stress on the frame 10 is reduced. Also, pump assembly 3 and frame 1
0 can also be made at the upper and lower bearings 8.9 of the pump assembly 3. Further, the entire outer circumference of the frame 10 does not necessarily have to be in contact with the inner circumference of the casing 1, so the frame 10 is not limited to an annular shape.

〔Effect of the invention〕

As explained above, the method for fixing a pump assembly for a compressor according to the present invention is a method for fixing a pump assembly for a compressor in which a pump assembly consisting of a cylinder, a shaft, etc. is fixed within a casing. An annular frame having the same outer diameter and less rigidity than the pump assembly is attached to the pump assembly so as to be aligned with the pump assembly, and the annular frame integrated with the pump assembly is fixed within the casing. Therefore, an excellent effect is achieved in that the pump assembly can be easily fixed within the casing without deforming it.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing an embodiment of the method for fixing a pump assembly for a compressor according to the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views showing conventional methods for fixing a pump assembly, respectively. DESCRIPTION OF SYMBOLS 1... Casing, 2... Motor, 3... Pump assembly, 4... Cylinder, 5, 10... Frame,
7... Shaft, 8, 9... Bearing, 11... Annular peripheral wall, 12... Annular support plate portion, 13... Rotor, 1
4...Stator. Applicant's agent Inomata Kiyomi 1st figure 2 Mitsu 3 embroidery

Claims (1)

[Claims] 1. In a method for fixing a pump assembly of a compressor in which a pump assembly consisting of a cylinder, a shaft, etc. is fixed in a casing, the pump assembly has an outer diameter approximately equal to the inner diameter of the casing and is less rigid than the pump assembly. Fixing a pump assembly of a compressor, characterized in that an annular frame is attached to the pump assembly so as to be aligned with the pump assembly, and the annular frame integrated with the pump assembly is fixed within a casing. Method. 2. The method of fixing a pump assembly for a compressor according to claim 1, wherein the annular frame is shrink-fitted to the casing by heating the casing, and the annular frame is welded to the casing. 3. A method for fixing a pump assembly for a compressor according to claim 1 or 2, wherein the annular frame is aligned with the shaft of the pump assembly.