JPH04112983A - Entirely-closed motor-driven compressor - Google Patents

Abstract

PURPOSE:To obtain simple assembling work and fixed strength by putting a compressor mainframe supporting, mounted on part of a compressor mechanism, in contact with one end of the body of a closed container and putting an auxiliary bearing support, on which an auxiliary bearing formed, in contact with the other end of the closed container. CONSTITUTION:A scroll compressor consists of a closed container 14 in which an electric motor 9 and a scroll compressor driven by the shaft 4 thereof are housed. The shaft 4 is supported by a main bearing 3 and an auxiliary bearing 12. In this case, a compressor mainframe 1 has a compressor mainframe supporting plate 15 mounted at the upper part thereof and put in contact with the upper 14d of a case 14a, welded fixed, and the electric motor 9 has a stator 11 shrink-fitted to the case 14a and fixed. As a result, problems such as the manufacturing cost and the reliability of conventional compressors in assembly and construction can be dissolved to obtain simple assembling work and firm fixed strength.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a completely hermetic electric compressor used in refrigeration and air-conditioning equipment for ships, and in particular, to reduce the sliding load on the rotating shaft. The present invention relates to a completely hermetic electric compressor having two main and auxiliary bearings, which is suitable for improving the reliability of the compressor.

[Prior Art] An example of a conventional totally hermetic electric compressor will be described using a scroll compressor with reference to FIGS. 4 to 6.

FIG. 4 is a vertical cross-sectional view of a conventional scroll compressor, FIG. FIG. 3 is a schematic partial sectional view showing an example of a welded state of the airtight container and the frame of the compressor main body.

Figure 4 shows the overall structure of a scroll compressor, which is particularly used as a low-vibration type among various compressors.
is the compressor main body, 22 is the frame, 23 is the main bearing, 24 is the rotating shaft, 25 is the orbiting scroll, 26 is the fixed scroll, 27 is the scroll wrap portion, 28 is the Oridum ring,
29 is an electric motor, 30 is a rotor, 31 is a stator, 32 is a sub-bearing, 33 is a support leg of the sub-bearing, 34 is a sealed container, and 35 is lubricating oil.

That is, the scroll compressor shown in FIG.
A main bearing 23 is formed on the frame 22 of the compressor part, and a sub bearing 32 is formed on a support leg 33 located on the side opposite to the electric motor with respect to the main bearing. These main bearings 23. Secondary bearing 3
2 to support the rotating shaft 24.

The details are as follows.

The compressor main body 21 is constructed by inserting the main shaft portion 24a of the rotating shaft 24 into the inner diameter of the main bearing 23 of the frame 22, and fitting the upper eccentric portion 24b and the inner diameter 25a of the orbiting scroll 25 via the Oldham ring 28. Furthermore, a fixed scroll 26 combined with a scroll wrap part 27 with appropriate gaps in the radial direction and height direction is placed on top of the fixed scroll 26, and the fixed scroll 26 and the frame 22 are fastened and fixed with bolts or the like. ing.

The electric motor 29 has a rotor 30. The rotor 3o is made up of a stator 31, and the rotor 3o is supported by press fit or shrink fit into the rotor fixing part 24d of the rotating shaft 24, and is disposed together with the stator 31 at the lower part of the closed container 34.
1 are housed in the upper part of the closed container 24 as shown in FIG. 4, respectively.

This conventional scroll compressor basically transfers the pressure applied to the scroll wrap section 27 due to the movement of the compression mechanism and the penetrating force generated by the weight of the drive section to the frame 27.
The bearing structure is such that the electric motor 29 is supported in a well-balanced manner by the two main bearings 23 and the T-shaped sub-bearing 32 of the electric motor 29. Secondary bearing 32
is arranged so that the sub-shaft portion 24c of the rotating shaft 24 is slidably fitted into its inner diameter.

The main components of such conventional scroll compressors are:
The compressor main body 21 is attached to the sealed container 34 by a plurality of arc spot welding, the stator 31 of the electric motor 29 is shrink-fitted to the sealed container 34, and the outer shape of the support leg 33 of the auxiliary bearing 32 is attached to the sealed container 34.
After being press-fitted into the inner diameter, they are each fixed by multiple arc spot welds.

The lubricating oil 35 is stored at the bottom of the sealed container 34, and the lubricating oil 35 is
4, and is supplied to each bearing part, contributing to smooth operation.

FIG. 5 is a longitudinal cross-sectional view showing the assembly procedure of the sub-bearing 32 and its support legs 33 used in the conventional scroll compressor. However, a screw hole 33a is formed in the support leg 33.

First, the supporting legs 33 and the case 34a of the closed container 34 are firmly attached to each other from the outside of the case 34a by multiple arc spot welding. After that, the sub-bearing 32 is fitted to the sub-shaft part 24c of the rotating shaft 24, and the bolt 36 is used to adjust the centering of the sub-bearing 32 and the sub-shaft part 24c of the rotating shaft 24, while tightening is a process of fixing. .

Further, FIG. 6 shows an example of a method of fixing the compressor main body 21 and the closed container 34. As shown in FIG. Considering the manufacturing accuracy of the sealed container 34 formed by welding, especially the fact that the straightness of the inner diameter is difficult to obtain, a slight gap 36 is maintained between the inner diameter of the sealed container 34 and the outer diameter of the frame 22, and the electric motor 29 is Rotor 30
．． With the gap gauge 37 auxiliary inserted between the stators 31, the compressor main body 21. Both of the closed containers 34 are firmly connected.

As a compressor with such an assembly structure.

One example is the one described in JP-A-1-170774, and this type of scroll compressor equipped with main and sub bearings has a bearing in each bearing that is generated by the inertia force due to the compressed gas pressure and the weight of the orbiting scroll. The purpose is to distribute the load in a well-balanced manner, prevent seizure of the bearing sliding surface, and achieve high reliability.

[Problems to be Solved by the Invention] Such conventional scroll compressors have the following problems.

Regarding the installation of the secondary bearing 32 shown in FIG.
3. In order to manufacture the sealed container 34 with precision and to absorb the deformation caused by press-fitting the two, the main body of the sub-bearing 32 is separated from its supporting legs 33, and the supporting legs 33 are welded to the case 34a of the sealed container 34. Thereafter, the bolt 36 is tightened while making delicate centering adjustments within the gap between the bolt through hole 32a of the sub-bearing 32 and the bolt 36, resulting in a complicated assembly process.

Further, the joint surface between the secondary bearing 32 and its support leg 33 is a horizontal surface, and when a transport impact force is applied in the horizontal direction, the joint surface becomes misaligned, making smooth operation impossible.

Furthermore, the secondary bearing 32, which is the cause of the complexity of the assembly process mentioned above. Divided structure of support legs 33 and multiple bolts 36
Because of the use of , the number of parts increases, leading to a rise in parts cost, and in addition, there is a problem in that the cost of associated processing such as machining of screw holes rises.

In addition, since multiple electrode consumable arc spot welding is required to fix the supporting legs 33 and the sealed container 34, droplets during welding may enter the sealed container 34, causing the droplets to slide. There was a problem that they could invade the parts of the building and cause locking accidents.

On the other hand, the compressor main body 21 side is also fixed using a closed container 34.
In order to ensure an appropriate air gap for the electric motor 29, an arc spot is placed between the airtight container 34, which has a gap, and the outer diameter of the frame 21. They are joined together by welding, so that droplets from welding can damage the support legs 33, which have a press-fit structure.
There is a problem in that the droplets are more likely to fall into the sealed container 34 than the other way around, and the droplets also enter the sliding parts, causing a jamming accident and impairing the reliability of operation.

The purpose of the present invention is to solve the manufacturing cost and reliability problems associated with the assembly structure of conventional compressors, and to realize a completely sealed compressor that enables simple assembly work and strong fixing strength. Our purpose is to provide electric compressors.

[Means for Solving the Problems] In order to achieve the above object, a completely hermetic electric compressor according to the present invention has a configuration including an electric motor section and a compressor driven by a rotating shaft in the electric motor section in a closed container. It houses the mechanical part and
The compression mechanism has a main bearing formed on a fixed frame constituting the compression mechanism section, and a sub-bearing formed on a sub-bearing support located on the opposite side of the main bearing, and these main bearings and sub-bearings In the fully hermetic electric compressor that supports the rotating shaft, a compressor main body support plate attached to a part of the compression mechanism part is brought into contact with one end surface of the body part of the closed container to form a sub bearing. The support body is in contact with the other end surface of the body of the hermetic container, and the compressor main body support plate and the sub-bearing support are welded to both end surfaces of the body of the hermetic container. .

It should be noted that after assembling the sub-bearing and the support leg together in advance and aligning the rotating shaft of the compressor and the sub-bearing, one end face of the body of the closed container and the support leg are placed on a horizontal plane. Welding is performed using a non-consumable electrode while the parts are in contact with each other. Similarly, a support plate made of a steel plate is provided on a part of the compressor body side, and this support plate and the other end surface of the body of the closed container are brought into contact with each other on a horizontal plane, and a non-consumable electrode is used to share the information. The problems of the prior art can be solved by welding.

[Action Co. The working of the above technical means is as follows.

The auxiliary bearing support leg is formed into a drawn steel plate shape with a simple flange, and a burring hole is provided in the center thereof into which the outer diameter of the auxiliary bearing can be fitted to form the auxiliary bearing.

In addition, on the compressor main body side, for example, a steel plate support plate having a flange on the outer periphery is fixed with bolts to the upper part of the fixed scroll that constitutes the compression mechanism, and the outer diameter dimensions of these support legs and support plate are fixed. , Weld the end face of the case related to the body part and the flange face of the support leg and support plate on a horizontal plane using a non-consumable electrode welding device, suitably matching the inner and outer diameter dimensions of the sealed container. By doing so, you can achieve that purpose.

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 to 3.

FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of a compressor main body support plate and sub-bearing support legs used in the compressor of FIG. The figure is an enlarged cross-sectional view showing an example of a welded state of the support member of FIG. 2 and the closed container.

In FIG. 1, 1 is a compressor main body related to a compression mechanism section;
2 is a frame related to a fixed frame constituting the compression mechanism, 3 is a main bearing formed in the frame 2, 4 is a rotating shaft, 5 is an orbiting scroll, 6 is a fixed scroll, 7 is an orbiting scroll 5, Spiral-shaped scroll wrap portions that stand upright on each end plate of the fixed scroll 6 and mesh with each other, 8 is an Oldham ring related to the rotation prevention means of the orbiting scroll 5, 9 is an electric motor, IC) is a rotor, and 11 is a stator. , 12 is a sub-bearing, 13 is a sub-bearing support leg related to a sub-bearing support body, 14 is an airtight container, 15 is a compressor main body support plate, 16
is a bolt, and 17 is lubricating oil.

That is, the scroll compressor shown in FIG. 1, like the five conventional scroll compressors shown in FIG.
4 houses an electric motor 9 and a scroll compressor section driven by the rotary shaft 4 in the electric motor 9, and a main bearing 3 formed on the frame 2 of the compressor section and a scroll compressor section driven by the rotating shaft 4. A sub-bearing 12 formed on a sub-bearing support leg 13 located on the side of the mold machine, and these main bearings 3. The rotary shaft 4 is supported by a sub-bearing 12.

The details are as follows.

The compressor main body 1 is constructed by inserting the main shaft portion 4a of the rotating shaft 4 into the inner diameter of the main bearing 3 of the frame 2, and fitting the upper eccentric portion 4b and the inner diameter 5a of the orbiting scroll 5 via the Oldham ring 8. , furthermore, a fixed scroll 6 combined with the scroll wrap part 7 with appropriate gaps in the radial direction and height direction is placed on the upper part of the scroll wrap part 7, and the fixed scroll 6 is
and the frame 2 are fastened and fixed with bolts 16. At this time, the compressor main body support plate 15 is attached and fixed to the upper part of the fixed scroll 6 using a plurality of bolts 16 that fasten the fixed scroll 6, as shown in FIG.

The electric motor 9 has a rotor 10. The rotor 10 is composed of a stator 11, and is supported by a rotor fixing portion 4d of the rotating shaft 4 by press fitting or shrink fitting, and is disposed together with the stator 11 at the lower part of the closed container 14. Further, the compressor main body 1 is housed in the upper part of the airtight container 14 as shown in FIG. 1, respectively.

Further, a sub-bearing 12 is disposed at the lower part of the electric motor 9, with the sub-bearing portion 4c of the rotary shaft 4 slidably fitted to the inner diameter of the sub-bearing 12.

The lubricating oil 17 stored in the lower part of the closed container 14 ascends through an oil passage (not shown) inside the rotary shaft 4 and is supplied to each bearing part, contributing to smooth operation.

As shown in FIG. 1, the airtight container 14 includes a cylindrical case 14a related to the body, an upper case 14b fitted and welded to cover the upper part of the case 14a, and a lower part of the case 14a fitted together. and a lower case 14c welded together.

The compressor body 1 is fixed by welding a compressor body support plate 15 attached to the upper part of the compressor body 15 in contact with the upper end surface 14d of the case 14a, and the stator 11 of the electric motor 9 is fixed to the case 14a by shrink fitting. However, the sub-bearing support leg 13 is connected to the case 14.
It is fixed by welding in contact with the lower end surface 14e of a.

FIG. 2 shows an example of the shapes of the compressor main body support plate 15 and the sub-bearing support legs 13 in the scroll compressor shown in FIG. 1.

The compressor main body support plate 15 shown in FIG. 2(a) is formed by plastic working of a steel plate, and has a flat part 15a in contact with the upper surface of the fixed scroll 6, and this flat part 15a has bolt through holes 15b. is perforated. Further, a raised portion 15c is formed outwardly from the flat portion 15a by plastic molding, and a flange portion 15d is further bent to form a flange portion 15d parallel to the flat portion 15a.

The sub-bearing support leg 13 shown in FIG. 2(b) is similarly formed by plastic working of a steel plate, and has a burring portion 13a in the center of which the sub-bearing 2 is joined by press-fitting or the like.
is formed, and passes through the raised portion 13b to the flange portion 13c.
is formed. The outer diameter of the flange of both parts is 15
The dimensions e and 13d are set to appropriate dimensions within the range of the inner diameter and outer dimensions of the upper and lower end surfaces 14d and 14e of the case 14a of the closed container 14.

Next, referring to FIG. 3, welding of the compressor main body support plate 15° sub-bearing support leg 13 will be explained.

The compressor body support plate 15 is positioned so that an appropriate gap can be secured between the rotor 10 of the electric motor 9 and the stator 1 at the bottom of the compressor body 1 (not shown), and the case is The upper end surface 14d of the compressor main body support plate 15 is brought into contact with the surface of the flange 15d of the compressor main body support plate 15 on a horizontal plane, and the case 14
Apply the outer diameter flange portion 15e perpendicularly to the upper end surface 14d of a, and use a welding torch 18 to, for example,
From the upper part of the end surface of the outer diameter flange portion 15e indicated by the broken line,
This is heated and melted to form a bead 19 in the shape shown by the solid line, and the compressor support plate main body 15 and case 14a are welded together.

Further, the sub-bearing support leg 13 supporting the sub-bearing 12 has a surface of its flange 13d and a surface of the case 14 in a state where the sub-shaft portion 4c of the rotating shaft 4 and the inner diameter of the sub-bearing 12 are slidably fitted.
a, and apply the outer diameter flange portion 13e perpendicularly to the lower end surface 14e of the case 14a, and use a welding torch 18 to
This is heated and melted and welded from the lower part of the end surface of the outer diameter flange portion 13e indicated by the broken line 3.

In this case, the welding device used does not use a consumable electrode type welding device that applies electricity directly to the welding line and welds while melting the welding line, but uses a non-consumable electrode such as TIG or plasma.

In addition, although Fig. 3 illustrates and explains that joint attachment is performed by welding, if joint attachment is not possible due to constraints such as the thickness of the steel plate to be welded, and you want to weld more firmly, welding is performed using the third method. It is also possible to build up the welding wire by feeding the welding wire into the molten pool obtained by the heating method shown in the figure.

According to this embodiment, the drawbacks of the conventional compressor assembly structure based on arc spot welding, the increase in the number of parts,
Problems such as complicated assembly processes, component costs such as machining of bolt tightening holes, and rising assembly costs can be solved.

In addition, in conventional compressors that assume that the supporting legs and sub-bearings are bolted together on a horizontal plane, the air gap may become distorted due to displacement of the sub-bearings due to the horizontal impact force received during transportation, resulting in performance problems such as inoperability. The problem is solved by firmly welding the support legs and the case.

Furthermore, in the conventional technology, each component was fixed by arc spot welding using a consumable electrode that melts and welds the sealed container and the welding wire by applying current to the welding wire, but in this example, the steel plates are bonded together using TIG or plasma welding. By adopting assembly and fixing using welding equipment using non-consumable electrodes such as, it is possible to prevent the scattering of fine droplets that previously invaded the sliding parts of the compressor and reduced reliability. It can prevent jamming of sliding parts and locking accidents caused by droplets.

Therefore, the fully hermetic electric compressor that adopts the assembly structure of this embodiment can reduce manufacturing costs and improve operational reliability, and is suitable for use in refrigeration.

The effect of application to cooling equipment is extremely large.

In addition, although the above embodiment describes an example of a scroll compressor, the assembly structure of the present invention is also applicable to other types of compressors.

[Effects of the Invention] As explained in detail above, according to the present invention, problems in manufacturing cost and reliability associated with the assembly structure of conventional compressors can be solved, simple assembly work can be realized, and a strong structure can be achieved. It is possible to provide a completely hermetic electric compressor that makes it possible to obtain a fixed strength.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of a scroll compressor according to an embodiment of the present invention, FIG. 2 is a sectional view of a compressor main body support plate and sub-bearing support legs used in the compressor of FIG. The figure is an enlarged cross-sectional view showing an example of the welded state of the support member in FIG. 2 and the closed container, and FIG. 4 is a longitudinal cross-sectional view of a conventional scroll compressor.
FIG. 5 is a longitudinal cross-sectional view showing an example of the assembly procedure of the sub-bearing and support leg of the compressor shown in FIG. 4. FIG. It is a schematic partial sectional view showing an example. DESCRIPTION OF SYMBOLS 1... Compressor body, 2... Frame, 3... Main bearing, 4... Rotating shaft, 9... Electric motor, 12... Sub-bearing, 13... Sub-bearing support leg, 14...Airtight container, 1
4a...Case, 14d...Top end surface, 14e...
Lower end surface, 15... Compressor main body support plate.

Claims (1)

[Claims] 1. An electric motor section and a compression mechanism section driven by a rotation shaft of the electric motor are housed in an airtight container, and a main bearing formed on a fixed frame constituting the compression mechanism section, and a counter electric motor for the main bearing are housed. In a completely hermetic electric compressor that has a sub bearing formed on a sub bearing support located on the side, and supports the rotating shaft by these main bearings and sub bearings, a compressor mounted on a part of the compression mechanism section is used. A machine body support plate is brought into contact with one end surface of the body part of the airtight container, and a sub-bearing support body forming a sub-bearing is brought into contact with the other end face of the body part of the airtight container, and these compressor body support plates and a sub-bearing support body are welded to both end surfaces of the body portion of the hermetic container.