JPS5844288A - Rotary type compressor - Google Patents

Abstract

PURPOSE:To improve the assembly means and reliability as well as to reduce working cost by forming an abutting part between upper and lower portions of a sealed vessel into a convexed shape toward the outside diameter direction of the vessel, by fitting the cylindrical outside brim of a fixing plate into a recessed part formed inside the vessel, and by welding these three members. CONSTITUTION:Abutting parts 17a and 16a of upper and lower portions 17 and 16 of a sealed vessel are formed into convexed shape radially toward the outside of the vessel so that thus constituted recess part inside the vessel can be fitted to the cylindrical outside brim of a frame fixing plate 12, and these three members are welded simultaneously as shown by 18. With these contrivances, the assembling of a compressor can be completed by one periphery weldings. Thus, the reliablity against leakage is increased while the assembling efficiency is improved so that the manufacturing cost can be reduced. In addition, the inside of the sealed vessel is constituted in such a manner that it can contain high pressure gas. The vessel is subjected to axial force F1 and radial force F2, but since, simultaneous welding of the frame fixing plate 12 provides the function of a strength mamber against the radial force F2, the radial deformation of the sealed vessel can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a rotary compressor (hereinafter referred to as a compressor) that is incorporated into a nine-air conditioner, a refrigerator, etc.

FIG. 1 shows the structure and assembly method of a conventionally known compressor. Here, the explanation will be given with reference to Patent Publication No. 54-10723. The airtight container consists of a bottom plate part 1, a body part 2, and an upper lid part 3, and a compression element 4 is fixed to the inner wall of the bottom plate part 1 by press fitting or bath welding. , a stator 5a of an electric element is mounted on the inner wall of the body part 2.
is press-fitted and fixed. These assembly methods are as follows: gap gauge 6tl-rotor 5b outer diameter stator 5 shown in FIG.
The bottom plate part 1 is attached and welded to the body part 2 while fitting it into the gap of the inner diameter of a, and then the gap gauge 6 is pulled out,
The upper lid body part 2 is capped and welded to the body part 2. The method of assembling the tomo-kari had the following drawbacks.

That is, since both the compression element 4 and the stator 5a are fixed to the inner wall of the closed container by press-fitting or the like, the outer diameter dimensions of these members must be finished to exact tolerances. Furthermore, even in an assembly in which the gap gauge 6 is fitted, the deviation of the gap size is basically fixed due to the inner diameter accuracy of the body part 2 and the bottom plate l, the eccentric deviation of the outer diameter with respect to the axis of the compression element 4, etc. In order to be
These parts also had to be finished to strict tolerances using the 1 method.

Furthermore, since the sealed container is constructed from the three members mentioned above, there are two welding points, which has the disadvantage of increasing work costs and increasing the risk of leakage.The purpose of the present invention is to enable increased processing accuracy of parts. The aim is to provide the market with highly reliable and inexpensive compressors by adopting a new assembly method and streamlining the assembly method.

That is, the electric element and the compression element are tightened and fixed to the frame fixing plate with bolts, and at the same time the gap between the stator inner diameter and the rotor outer diameter is adjusted. By abutting the lower container butt part as a backing metal and welding these three members at the same time,
There is only one sealed container welding point. This greatly streamlines assembly and reduces the risk of leakage from the container.

An embodiment of the present invention will be described below with reference to FIGS. 3 to 5. FIG. 3 shows an example of a method of fixing the electric element of the frame fixing plate 12 and the compression element. The compression element has a cylinder 13 and a bearing 14 assembled in the frame 11, and a rotor 5b fixed to a rotating shaft (not shown). Then, the stator 5a is stacked on the frame fixing plate 12, and the gap gauge 6 is stacked on the stator 5a.
While fitting the bolt 1 into the gap between the inner diameter and the outer diameter of the rotor 5b,
It is tightened and fixed in step 5. Here, the frame fixing plate 12 has a cylindrical outer end 12a and has a substantially donut shape. FIG. 4 shows an example of the structure of a closed container according to the present invention. The metal is brought into contact with the abutting portion from the inside as a backing metal, so that the three members can be welded together at the same time. FIG. 5 is a detailed view of section B shown in FIG. 4. That is, the abutting portions 17 a s 16 a of the upper and lower parts 17 and 16 of the closed container are each formed into a convex shape in the outer radial direction, and the frame fixing plate 12 is formed in the inner concave portion.
The cylindrical outer end portions of the two members are configured so that they can be fitted together, and the three members are welded 18 at the same time. As a result, not only can assembly be completed with only one bath contact, but the following effects can be expected. That is, the inside of the closed container of this type of compressor is configured to store high-pressure gas, and an axial force F1 and a radial (circumferential) force Ft act on the container. In the opposite direction, the force F increases considerably. Here, as in the present invention, if the frame fixing plate 12 is brought into contact at the same time, it can be expected to function as a strength member against radial force, so that deformation of the closed container in the radial direction can be reduced.

Furthermore, since only one welding point is required, reliability against leakage is clearly improved.

As described above, the frame fixing plate incorporating the electric element and the compression element, and the upper and lower three parts of the closed container are not in accordance with the present invention.
Since the components are welded at the same time, only one welding location is required, which improves assembly efficiency and reduces processing costs for the compressor. In addition, it is expected that reliability will be improved by reducing leakage devices, so the practical young fruits of the present invention are large and smooth.

[Brief explanation of the drawing]

Fig. 1 shows an example of a conventionally known compressor assembly method, and is a side view fR, and Fig. 2 shows an oblique fl! Figure 3 shows an embodiment of the assembly method of the present invention, and is a cross-sectional view from the int+ plane, Figure 4 is a view from the entry direction of the proboscis view, and Figure 5 is a closed container of the present invention. Figure 6 is a detailed cross-sectional view of the mouth in Figure 45. 10. Bottom plate part, 2... Body part, 3... Top lid body part,
4... Compression element, 5a... Stator, 5b... Rotor, 6... Gear, pump gauge, 11... Frame,
12... Frame fixing plate, 12a... Cylindrical outer end, 12b... Two nuts, 13... Cylinder,
14... Bearing, 15... Bolt, 16... Lower part of container, 15 a... Butt part, 17... Upper part of container,
17. ... Butt part, 18... Welding part.

Claims (1)

[Scope of Claims] 1. A rotary compressor comprising a substantially donut-shaped frame fixing plate with a cylindrical outer end in a closed container, and a compression element fixed to the fixing plate with bolts or the like. , the upper and lower parts of the airtight container are butt-butted and fixed together, and the cylindrical outer end of the fixing plate is used as a backing metal during the connection,
A rotary compressor characterized in that the three members are simultaneously welded by contacting the abutting portion from inside the container. 2. The abutment part of the sealed container is formed in a convex shape in the direction of the container outer casing, the cylindrical outer end of the fixing plate is aligned with the recessed part of the container inner casing, and these three members are simultaneously welded. A low-load compressor according to claim 1.