JPH0547463U - Scroll compressor - Google Patents

Abstract

(57) [Summary] [Objective] To obtain a scroll compressor that can accurately fix the frame and subframe to the shell so that the eccentricity and inclination of the main bearing of the frame and the subbearing of the subframe are reduced. [Structure] Shell 8 of frame 5 and subframe 6
The positions of the shrink fitting portions 5b and 6b are closer to the motor / stator 7a side than the bearing portions 5a and 6a.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a scroll compressor of a hermetically sealed type used for refrigerators and air conditioners.

[0002]

[Prior Art]

 FIG. 3 is a sectional view showing a conventional scroll compressor disclosed in the specification of Japanese Patent Application No. 2-186181 filed by the applicant earlier. In the figure, 1 is a fixed scroll composed of a base plate and a spiral portion, Reference numeral 2 is an orbiting scroll composed of a base plate, a spiral portion, and a shaft portion, 3 is a main shaft, 3a is an oil pump provided at the lower end of the main shaft 3, and 4 is provided between the orbiting scroll 2 and the frame 5. The Oldham coupling prevents the orbiting scroll 2 from rotating. Reference numeral 5 is a frame that supports the fixed scroll 1 and the orbiting scroll 2, 5b is a frame shrink-fitting portion of the frame 5 and the shell 8, and 6 is a subframe that supports the lower end portion of the main shaft 3, the main bearing 5a and the sub bearing 6a. In order to reduce the eccentricity and inclination of the frame 5, the frame 5 is welded and fixed to the shell 8 by highly accurate positioning. 6b is a sub-frame shrink-fitting portion of the sub-frame 6 and the shell 8, 7 is a motor, 7a is a motor / stator fixed by shrink-fitting in the shell 8, 8 is a shell, 8a is an inner space of the motor side shell, and 8b is fixed. Scroll-side shell inner space, 11 is a discharge port, 12 is a sealed terminal, 13 is a suction pipe, 14 is a discharge pipe, and 15 is lubricating oil accumulated at the bottom of the shell 8.

Next, the operation will be described. When the sealed terminal 12 is energized, the motor 7 produces torque and the spindle 3 rotates. As a result, the orbiting scroll 2 starts to rotate and, in combination with the fixed scroll 1, the fluid gas is compressed by the well-known compression principle of the scroll compressor. At this time, the fluid gas is sucked from the outside of the shell 8 through the suction pipe 14, flows into the shell inner spaces 8a and 8b, and then is sucked into the compression mechanism portion combined by the fixed scroll 2 and compressed by the compression principle. Then, it is discharged to the outside of the shell 8 through the discharge port 11 and the discharge pipe 13.

[0004]

[Problems to be solved by the device]

 Since the conventional scroll compressor is configured as described above, when fixing the frame and subframe to the shell with high accuracy so that the eccentricity and inclination of the main bearing of the frame and the sub bearing of the subframe are reduced, The concentric assembly mounting surface 5c on the inner peripheral surface of the frame provides the concentricity and parallelism with respect to the main bearing with a predetermined accuracy, and the concentric assembly mounting surface 6c of the subframe has the concentricity and parallelism with respect to the sub bearing with the predetermined accuracy. By using a concentric assembly jig that has a certain degree of accuracy in the alignment, concentricity, and parallelism, the concentric assembly jig is mounted on the concentric assembly mounting surface of the frame and subframe, and the subframe is referenced based on the frame. It is necessary to weld and fix it to the shell, and there is a problem that the assemblability deteriorates.

The present invention has been made in order to solve the above-mentioned problems, and the frame and the subframe are accurately arranged so that the eccentricity and inclination of the main bearing of the frame and the sub bearing of the subframe are reduced. The purpose is to obtain a scroll compressor that can be fixed to the shell.

[0006]

[Means for Solving the Problems]

 In the scroll compressor according to the present invention, the position of the shrink fitting portion with the shell of the frame and the subframe is closer to the motor / stator side than the bearing portion.

[0007]

[Action]

 In the scroll compressor according to this invention, the eccentricity and inclination of the main bearing of the frame and the sub-bearing of the subframe are adjusted by making the position of the shrink fit portion of the frame and the shell of the subframe closer to the motor / stator side than the bearing portion. Is small, and the frame and subframe can be fixed to the shell with high precision.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, the position of the shrink-fitting portion of the frame 5 and the sub-frame 6 with the shell 8 is closer to the motor / stator 7a side than the bearing portion.

Next, the assembly of the scroll compressor will be described. First, the motor / stator 7a is shrink-fitted and fixed to the shell 8. Next, the frame 5 is shrink-fitted and fixed to the inner wall of the shell 8, and one end face of the main shaft 3 to which the motor 7 is already fixed is inserted into the main shaft bearing 5a of the frame, and then the sub frame 6 is attached to the motor / stator 7a. It is shrink-fitted and fixed to the inner wall of the shell 8 on the opposite side of the frame 5.

Generally, when the frame 5 and the subframe 6 are shrink-fitted and fixed to the shell 8, the accuracy of the frame shrink-fitted portion 5b between the frame 5 and the shell 8 and the subframe shrink-fitted portion 6b between the subframe 6 and the shell 8 is accurate. Are the same, the eccentricity and inclination of the main bearing 5a and the sub bearing 6a become smaller as the distance between the frame shrink fit portion 5b and the sub frame 6b becomes smaller (L2 <L1 as shown in FIG. 2). . In this embodiment, the frame shrink fit portion 5b is closer to the motor / stator 7a side than the frame main bearing 5a, and the subframe shrink fit portion 6b is closer to the motor / stator 7a side than the sub frame auxiliary bearing 6a. Since the frame shrink-fitting portion 5b and the sub-frame shrink-fitting portion 6b are close to each other, the subframe is not fixed to the shell 8 by highly accurate positioning with respect to the frame 5, unlike the conventional case. Since the eccentricity and inclination of the main bearing 5a and the sub-bearing 6a of the sub-frame are small, the frame 5 and the sub-frame 6 can be accurately fixed to the shell 8.

Further, the frame 5 and the frame 8 shrink-fitting portion 5b of the shell 8 and the sub-frame 6 and the shell 8 sub-frame shrinking fitting portion 6b should be previously subjected to high-precision cutting such as circularity and coaxiality. For example, the eccentricity and inclination of the main bearing 5a of the frame and the sub bearing 6a of the subframe are further reduced.

[0012]

[Effect of the device]

 As described above, according to the present invention, the position of the shrink fitting portion of the shell of the frame and the subframe is closer to the motor / stator side than the bearing portion, so that it is easy to assemble the scroll compressor. With this method, the eccentricity and inclination of the main bearing of the frame and the sub-bearing of the subframe are small, and there is an effect that the frame and subframe can be fixed to the shell with high accuracy.

[Brief description of drawings]

FIG. 1 is a sectional view showing a scroll compressor according to an embodiment of the present invention.

FIG. 2 is an explanatory view showing the effect of this invention.

FIG. 3 is a cross-sectional view showing a conventional scroll compressor.

[Explanation of symbols]

 1 Fixed Scroll 2 Oscillating Scroll 3 Main Spindle 5 Frame 5a Main Bearing 5b Frame Shrink Fit 6 Subframe 6a Secondary Bearing 6b Subframe Shrink Fit 7 Motor 7a Motor Stator 8 Shell

Claims (1)

[Scope of utility model registration request] 1. A scroll-type compression mechanism in which a fixed scroll and an orbiting scroll are combined in a shell,
A main shaft that transmits a driving force to the orbiting scroll, a frame that axially supports the fixed scroll and the orbiting scroll, a motor and a motor-stator that drive the main shaft,
In a scroll compressor provided with a sub-frame supporting an end of the main shaft on the side opposite to the frame, the position of the shrink fitting portion of the frame and the shell of the sub-frame is closer to the motor / stator side than the bearing portion. And scroll compressor.