JPH0914158A - Scroll compressor and manufacture thereof - Google Patents

Abstract

PURPOSE: To assemble a scroll compressor with high precision and to provide high reliable constitution to decrease the generation of noise by a method wherein a terminal having a connection terminal is molded outside the inside diameter of the drum part of a closed container. CONSTITUTION: During processing of the drum part of a closed container, a pipe drawn from a steel material is used in the elementary pipe 3-D of a closed container. Holes 18-A and 18-B to securely weld a compressor element and an auxiliary bearing member and holes 18-C and 18-D to braze a suction pipe and a delivery pipe are formed in the elementary pipe 3-D. To weld a terminal to the elementary pipe 3-D, a flat surface 17 is extruded to a drum part to form a hole 18-E. Consecutively, a suction pipe and a delivery pipe are fitted in the holes 18-C and 18-D and heated and molten together with a braze filler metal 19 for brazing. As noted above, by positioning the flat surface 17 outside the inside diameter of the drum part, the precision of the inside diameter of the drum part is produced by an expander. Thereafter, a terminal 6 is resistance-welded to the drum part.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used for refrigeration and air conditioning and a method for manufacturing the scroll compressor.

[0002]

2. Description of the Related Art FIG. 7 shows the basic structure of a scroll compressor.

In a scroll compressor used for refrigeration / air conditioning, a compressor element 1 for compressing a refrigerant and an electric motor element 2 for driving the compressor element 1 are housed in a closed container 3.

The closed container 3 has a cylindrical body portion 3-A.
And an upper end plate 3-B and a lower end plate 3-C, which drive the suction pipe 4 for sucking the refrigerant into the closed container 3, the discharge pipe 5 for discharging the compressed refrigerant out of the closed container 3 and the electric motor element 2. A terminal 6 for supplying an external power source is attached.

The compressor element 1 has a fixed scroll 7 and an orbiting scroll 8. The fixed scroll 7 has a fixed scroll 7-B attached to a fixed end plate 7-A and a discharge port 7-C provided at the center. And the swirl side spiral plate 8-B on the swirl side end plate 8-A.
And the orbiting scroll 8 provided with a central shaft 8-C,
A drive shaft 10 that fits and drives a central shaft 8-C of the orbiting scroll 8 into an eccentric bearing 9, a rotation preventing member 11 that prevents rotation of the orbiting scroll 8, and a main shaft 10-A of the drive shaft 10. Frame 13 with main bearing 12 for bearing
Consists of

In the compressor element 1, the fixed scroll 7 is used.
The closed container 3 is provided in the compression chamber formed by the fixed side spiral body 7-B of the orbiting scroll 8 and the orbiting side spiral body 8-B meshing with each other.
The refrigerant taken in is taken in, the refrigerant is compressed by the orbiting motion of the orbiting scroll 8, and is discharged as a high-pressure refrigerant from the discharge port 7-C of the fixed scroll 7.

The compressor element 1 includes a closed container 3
It is fixed by fitting or welding.

The stator 2-A of the electric motor element 2 is fitted in the closed container 3, the rotor 2-B is fitted in the drive shaft 10, and the stator 2-A is connected to the connection terminal of the terminal 6. ing.

The drive shaft 10 includes a main bearing 12 of a frame 13.
And a sub-bearing 14-A of the sub-bearing member 14 positioned with the electric motor element 2 interposed therebetween.

The sub-bearing member 14 for holding the sub-bearing 14-A is fixed to the closed container 3 by fitting or welding.

At the bottom of the closed container 3, there are main bearings 12,
The auxiliary bearing 14-A, the eccentric bearing 9, and the thrust bearing that supports the load in the thrust direction of the orbiting scroll 8 are lubricated, and there is an oil reservoir 15 that stores oil that seals the leakage of the refrigerant in the compression chamber. Attached oil pump 16
Is supplied to the bearing portion through the oil hole 10-B in the drive shaft 10.

The oil supplied to the bearing portion is the frame 13
The oil is returned from the oil return hole 13-A, and returns to the oil sump 15 from the space formed by the notch (not shown) of the closed container 3 and the stator 2-A of the electric motor element 2.

In the electric motor element 2, the rotor 2-B is fitted to the drive shaft 10, the stator 2-A is fitted to the body portion 3-A of the hermetically sealed container 3, and the terminal 6 is used. The compressor element 1 is driven by applying an external power supply to the winding 2-C of the stator 2-A.

When the compressor element 1 is driven, the refrigerant is sucked into the closed container 3 through the suction pipe 4, and the refrigerant compressed by the compressor element 1 is discharged through the discharge pipe 5.

Next, an example of the procedure for assembling the scroll compressor will be described with reference to FIG. In the compressor element 1, the respective members are selectively combined so that the gap between the fixed side spiral body 7-B and the swirling side spiral body 8-B shown in FIG. The frame 13 holding the is fixed to the fixed scroll 7 by bolts.

A terminal 6 is resistance-welded to the closed container 3, and a suction pipe 4 and a discharge pipe 5 are brazed to each other.

The stator 2-A of the motor element 2 is a closed container 3.
The stator 2 of the electric motor element 2 is shrink-fitted and fitted to the body portion 3-A of the electric motor element 2.
-Fix the compressor element 1 to the closed container 3 with a jig so that the center of A and the center of the compressor element 1 may coincide.
And the closed container 3 are attached by welding.

The rotor 2-B of the motor element 2 is connected to the drive shaft 10.
Then, it is fitted into the closed container 3 by attaching the stator 2-A of the compressor element 1 and the electric motor element 2 to the closed container 3.

The sub-bearing member 14 is fixed by a jig so that the center of the main bearing 12 of the compressor element 1 and the center of the sub-bearing 14-A coincide with each other, and the sub-bearing member 14 is attached to the sealed container 3 by welding.

An oil pump 16 is attached to the tip of the drive shaft 10, and an upper end plate 3-B and a lower end plate 3- are attached to both ends of the closed container 3.
Weld C.

After vacuum drying, oil is sealed in the closed container 3. The scroll compressor includes a discharge space, a compressor element 1, an electric motor element 2, an auxiliary bearing member 14, and an oil pump 1.
6, the oil sumps 15 are arranged in a line, and the compressor element 1, the electric motor element 2, and the auxiliary bearing member 14 are the body portion 3 of the closed container 3.
It is incorporated in A by welding or fitting.

[0022]

In the scroll compressor having such a structure, the shaft center of the compressor element 1 and the auxiliary bearing member 1 are provided.
4 is affected by the accuracy of the inner diameter of the body portion 3-A of the closed container 3, and if the accuracy of the body portion 3-A is poor, the stator 2-A and the rotor 2- of the electric motor element 2 will be described. It is difficult to make the gap with B uniform over the entire circumference.

Further, a thin steel pipe is used for the body portion 3-A of the hermetically sealed container 3 in order to reduce the weight and cost, and the height of the compressor is kept low and the terminal 6 is used for easy work. Since the suction pipe 4, the suction pipe 4, and the discharge pipe 5 are arranged on the side surface of the body portion 3-A of the closed container 3, it is difficult to secure the inner diameter of the body portion 3-A of the closed container 3 with high accuracy. .

When assembled and manufactured in a state where the inner diameter accuracy is poor, the gap between the electric motor element 2 and the compressor element 1 and the auxiliary bearing member 1 are poor.
The shaft misalignment of No. 4 occurs, and the reliability of the compressor is deteriorated, the noise is generated, and the bearing is damaged.

Therefore, the present invention intends to provide a structure and a manufacturing method for accurately finishing the inner diameter accuracy of the body portion of the closed container.

[0026]

According to a first aspect of the present invention, a compressor element supports an orbiting scroll engaged with a fixed scroll, a drive shaft for driving the orbiting scroll, and a main shaft of the drive shaft. A frame having a main bearing, and is assembled so that the gap between the fixed scroll and the orbiting scroll becomes uniform, and the electric motor element is provided with a rotor fitted to the drive shaft and a connection terminal. The compressed container is provided with a stator connected to an external power source, a suction pipe for sucking the refrigerant, a discharge pipe for discharging the refrigerant, a body having a terminal having the connection terminal, and a sealed container having two end plates. In a scroll compressor configured by welding or fitting a machine element, the electric motor element, and a sub-bearing member supporting the sub-shaft of the drive shaft, for resistance welding the terminal. Tanmen is what has a structure obtained by forming the outer side than the inner diameter of the body portion of the closed container.

According to a second aspect of the present invention, in the invention according to the first aspect, the flat surface for resistance welding the terminal is a strip-shaped flat surface parallel to the axis of the body of the closed container, and It is configured to be molded outside the inner diameter of the body of the closed container.

According to a third aspect of the invention, in the invention according to the second aspect, the band-shaped flat surface and the notch of the stator of the electric motor element face each other.

Further, in the invention according to claim 4, the compressor element comprises an orbiting scroll meshed with a fixed scroll, a drive shaft for driving the orbiting scroll, and a main bearing for supporting the main shaft of the drive shaft. A frame having the same, and assembled so that a gap between the fixed scroll and the orbiting scroll becomes uniform, and the electric motor element is connected to an external power source through a rotor fitted to the drive shaft and a connection terminal. A rotor provided with a fixed stator, the rotor is located at the center of the stator, and a body provided with a suction pipe for sucking the refrigerant, a discharge pipe for discharging the refrigerant, and a terminal having the connection terminal; In a closed container having an end plate, the compressor element,
In a method for manufacturing a scroll compressor configured by welding or fitting an auxiliary bearing member that supports an auxiliary shaft of the drive shaft in order to the electric motor element, in a method for manufacturing a scroll compressor, a flat surface for resistance-welding the terminal has a flat surface on which the body of the hermetic container is sealed. The body portion of the closed container formed outside the inner diameter of the portion is subjected to flat surface processing and hole processing, and then the inner diameter of the body portion of the closed container is finished.

According to a fifth aspect of the present invention, in the method for manufacturing a scroll compressor according to the fourth aspect, a flat surface for resistance welding the terminal is formed outside the inner diameter of the body portion of the closed container. Planar processing on the body of the closed container,
After making a hole and brazing the connection pipe for sucking and discharging the refrigerant, the inner diameter of the body of the closed container is finished.

[0031]

The action of the invention according to claim 1 occurs during the production of the closed container by forming the flat surface for resistance welding the terminal to the closed container to the outside of the inner diameter of the body of the closed container. The inner diameter strain of the formed body is corrected by performing plastic working or cutting.

Since the inner diameter of the body of the closed container is accurately finished, it is possible to assemble the compressor element, the motor element, and the auxiliary bearing member so that the shaft center of the compressor element coincides with the shaft center of the auxiliary bearing member.

In addition to the effect of the invention according to claim 1, the function of the invention according to claims 2 and 3 widens the route for returning the oil that lubricates the bearing portion to the oil sump.

Further, the effects of the inventions according to claims 4 and 5 are that the scroll compressor can be manufactured easily and reliably by the body portion of the closed container having excellent inner diameter accuracy.

[0035]

Embodiments of the present invention will be described below with reference to the drawings. The same parts as those in the conventional example are designated by the same reference numerals as those shown in FIG.

(Embodiment 1) FIG. 1 shows a cross section of a body of a closed container of a scroll compressor according to an embodiment of the present invention.

In FIG. 1, in order to reduce the weight and cost, the body portion 3-A of the closed container is subjected to piercing (burring) for attaching a connecting pipe to a thin steel pipe and burring, and the terminal 6 is resistance-welded. The flat surface 17 for punching is extruded, and punching is performed.

At this time, the body portion 3 of the closed container 3 is processed by the processing force.
Machining deformation (first machining strain) occurs in the inner diameter of −A.

Next, the body 3 of the closed container 3 which has been perforated
-A brazes the suction pipe 4 and the discharge pipe 5.

At this time, since local heating and rapid cooling are performed, thermal stress causes further working deformation (second working strain) in the inner diameter of the body portion 3-A of the closed container 3.

Conventionally, since the sum of the first and second processing strains remains in the closed container 3 until the final assembly step, the centers of the compressor element 1, the motor element 2, and the auxiliary bearing member 14 are aligned with a jig. Even when assembled in the closed container 3, the center was displaced due to the processing strain of the closed container 3.

In the embodiment of the present invention, in order to finish the inner diameter of the body portion 3-A of the closed container 3 by expander finishing by a press or inner diameter cutting after the first strain generation or the second strain generation, the terminal 6 is finished. The flat surface 17 of the resistance welded portion is formed outside the inner diameter of the closed container 3.
Then, as shown in FIG. 2, the terminal 6 and the suction pipe 4,
Since the discharge pipe 5 is provided in the body portion 3-A of the closed container 3 and is also arranged within 120 degrees in the circumferential direction, the height of the compressor becomes low and the workability at the time of mounting the refrigeration cycle unit is also good. Has become.

Next, FIG. 3 shows an example of a processing procedure for the body portion 3-A of the closed container 3. As the raw pipe 3-D of the closed container 3, a pipe drawn from a steel material or a steel plate is rolled and welded into a tubular shape.

Holes 18-A, 18 for welding and fixing the compressor element 1 and the auxiliary bearing member 14 to the raw pipe 3-D of the closed container 3.
-B, hole 18-C, 1 for brazing suction pipe 4 and discharge pipe 5
Open 8-D.

Next, in order to contact-weld the terminal 6 to the raw pipe 3-D of the closed container 3, the flat surface 17 is pushed out to the body portion 3-A to make a hole 18-E.

The strain generated by the press work such as the extrusion of the flat surface 17 or the punching has a constant strain position.

As a means for reducing this distortion, when a welded pipe is used, the welding is carried out on the flat surface 17 or the holes 18-C, 1
The position is set to be 180 degrees away from 8-D, the elastic body is attached to the mold so as to absorb the strain, and the mold is shaped in consideration of the strain in advance.

Next, the hole 18- of the body portion 3-A of the closed container 3
Fit the suction pipe 4 and the discharge pipe 5 into C, 18-D, and braze 1
Heat with 9 and melt and braze.

In the brazing, since it is rapidly cooled in a step of heating to a temperature of 500 ° C. or higher in a wide range and then the flux is removed, a large residual stress is generated and the body portion 3-A of the closed container 3 is largely distorted.

As described above, in the scroll compressor, since the compressor element 1, the electric motor element 2, and the auxiliary bearing member 14 are fixed to the body portion 3-A of the closed casing 3, a large strain is applied to the body portion 3-A. If so, the scroll compressor cannot be assembled accurately.

In the present invention, since the flat surface 17 is located outside the inner diameter of the body portion 3-A, the inner diameter of the body portion 3-A is accurately processed by the expander.

There is no problem in cutting the inner diameter with accuracy by cutting with a lathe. The terminal 6 is resistance-welded to the body portion 3-A of the closed container 3 having the inner diameter finished.

FIG. 4 shows the strain generated by the extrusion or punching of the flat surface 17 and the strain caused by brazing.

In the case of resistance welding of the terminal 6, since the applied pressure is small and the local heating is performed, the strain is very small compared with the strain generated by the extrusion or punching of the flat surface 17 and the strain caused by the brazing. .

If a large force is applied to the body portion 3-A after resistance welding of the terminal 6, cracks may occur in the glass portion of the terminal 6, so that the body portion 3 of the closed container 3 may be cracked.
-The precision of the inner diameter of A is performed after pressing or brazing.

(Embodiment 2) The closed container 3 is shown in FIG.

The band-shaped flat surface 20 of the body portion 3-A is formed by the blank tube 3.
It is configured to be parallel to the axis of the body portion 3-A and outside the inner diameter of the body portion 3-A when the -D is pulled out.

The band-shaped flat surface 20 is formed on the body 3 by pressing.
-When extruded to the outside of the inner diameter of A, the deformation may be large, resulting in partial constriction and thin wall thickness.
When the material is formed into a strip shape in the drawing step, the material is deformed only by the axial flow of the material, so that the thickness can be made uniform and the amount of strain can be reduced.

FIG. 6 shows a cross section of an example of assembling the body portion 3-A of the closed container 3 and the stator 2-A of the electric motor element 2 of the present invention.

As another effect, the body portion 3-A of the closed container 3
If the band-shaped flat surface 20 and the notch 21 of the stator 2-A are aligned, the space for returning the oil that lubricated the bearing portion to the oil sump 15 can be widened, so that the oil surface can be secured and the motor element 2 The cooling of the winding 2-C is also improved.

[0061]

As described above, the scroll compressor of the present invention has a closed container having a high inner diameter accuracy without increasing the plate thickness of the closed container, and therefore has a high accuracy as a whole and a small size. -Lightweight and highly reliable configuration.

Further, by forming the band-shaped flat surface on the body of the closed container, the oil return is improved and the oil surface can be secured, and the winding of the motor element is cooled well.

Further, the present invention provides an excellent method for manufacturing a scroll compressor, which can be easily manufactured by subjecting the body of the scroll compressor described above to various inner diameter processing.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a body of a closed container of a scroll compressor according to a first embodiment of the present invention.

FIG. 2 is a perspective view of the scroll compressor.

FIG. 3 is an explanatory view of a processing procedure of a body portion of an airtight container of the scroll compressor.

FIG. 4 is an explanatory diagram of distortion caused by the same processing.

FIG. 5 is a perspective view of a body of a closed container of a scroll compressor according to a second embodiment of the present invention.

FIG. 6 is a cross-sectional view of the closed container and the stator.

FIG. 7 is a vertical sectional view of a scroll compressor.

FIG. 8 is an explanatory diagram of an assembly procedure of the scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Compressor element 2 Electric motor element 2-A Stator 2-B Rotor 3 Airtight container 3-A Body part 3-D Element pipe 4 Suction pipe 5 Discharge pipe 6 Terminal 7 Fixed scroll 8 Orbiting scroll 10 Drive shaft 12 Main bearing 13 frame 14 auxiliary bearing member 14-A auxiliary bearing 15 oil sump 17 flat surface 20 strip-shaped flat surface 21 notch

Claims (5)

[Claims] 1. A compressor element comprises an orbiting scroll meshed with a fixed scroll, a drive shaft for driving the orbiting scroll, and a frame having a main bearing for supporting the main shaft of the drive shaft, The scroll and the orbiting scroll are assembled to have a uniform gap, and the electric motor element includes a rotor fitted to the drive shaft, and a stator connected to an external power source through a connection terminal. A compressor body, an electric motor element, and a sub-shaft of the drive shaft in a closed container having a body having a terminal having the connection terminal and a discharge pipe for discharging the refrigerant, and a discharge pipe for discharging the refrigerant. In a scroll compressor configured by welding or fitting a sub-bearing member for supporting the terminal, a flat surface for resistance welding the terminal is formed outside the inner diameter of the body of the closed container. A scroll compressor characterized by being shaped. 2. A flat surface for resistance-welding a terminal is a belt-shaped flat surface parallel to the axis of the body of the closed container, and is formed outside the inner diameter of the body of the closed container. The scroll compressor according to claim 1. 3. The scroll compressor according to claim 2, wherein the band-shaped flat surface and the notch of the stator of the electric motor element are opposed to each other. 4. The compressor element comprises an orbiting scroll meshed with a fixed scroll, a drive shaft for driving the orbiting scroll, and a frame having a main bearing for supporting the main shaft of the drive shaft. The scroll and the orbiting scroll are assembled to have a uniform gap, and the electric motor element includes a rotor fitted to the drive shaft, and a stator connected to an external power source through a connection terminal, The rotor is located at the center of the stator, and the compressed water is introduced into a closed container having a body having a suction pipe for sucking a refrigerant, a discharge pipe for discharging the refrigerant, and a terminal having the connection terminal, and two end plates. In a method of manufacturing a scroll compressor, in which a machine element, the electric motor element, and an auxiliary bearing member that supports the auxiliary shaft of the drive shaft are welded or fitted in this order, the terminal is resistance-welded. A flat surface is formed on the outside of the inner diameter of the body of the closed container. The body of the closed container is subjected to flat processing and hole processing, and then the inner diameter of the body of the closed container is finished. And a method for manufacturing a scroll compressor. 5. A connecting pipe for sucking and discharging a refrigerant, wherein a flat surface for resistance-welding a terminal is formed outside the inner diameter of the body of the closed container, and the body of the closed container is subjected to flat surface processing and hole processing to suck and discharge the refrigerant. The method for manufacturing a scroll compressor according to claim 4, wherein the inner diameter of the barrel portion of the closed container is finished after brazing.