JPS61182487A - Enclosed type compressor - Google Patents

Abstract

PURPOSE:To prevent improper starting of a compressor and the generation of its abnormal noise, by forming an external shape of a cylinder, fixed to an enclosed vessel, agreeing almost with the external shape of a stator and ensuring a necessary clearance between both the cylinder and the vessel so as to surely fix the cylinder when it is welded and fixed to the enclosed vessel. CONSTITUTION:A cylinder 9, providing an escape part 9a agreeing almost with a notch 3a of a stator 3, is constituted so that the notch 3a and the escape part 9a almost coincide in the axial direction when a compressor is assembled. Consequently, the cylinder 9, when it is fixed to an enclosed vessel 1 by welding or the like, can be surely fixed to the enclosed vessel 1 increasing also the rigidity by placing the periphery of the cylinder 9 almost along the internal periphery of the enclosed vessel 1. Accordingly, the cylinder adequately holds also an air gap, and the compressor can prevent its coefficient of performance from worsening due to improper starting and the generation of an abnormal noise from a contact of a rotor 2 with the stator 3 by magnetic force of an electric driving element 4 in operation further due to a decrease of efficiency of the electric driving element 4 in accordance with unevenness of the air gap.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a cylinder fixed to a closed container.

Structure of the conventional example and its problems A conventional rotary compressor has a structure as shown in FIGS. 4 to 7.

That is, an electric element 4 consisting of a rotor 2 and a stator 3 and a compression element 5 for compressing refrigerant are arranged in the closed container 1. It is fixed to the airtight container 1 by means such as shrink fitting between the surrounding surface and
The rotor 2 is fixed to a crankshaft 6 that connects the electric element 4 and the compression element 5 by means such as shrink fitting. In addition, the compression element 5
is a component thereof, and is a gap between the rotor 2 and the stator 3 (hereinafter referred to as the air gap) between the circular outer peripheral surface of the cylinder 7, which has a compression space inside, and the inner peripheral surface of the closed container 1.
It is adjusted to keep it constant and fixed by means such as welding. Furthermore, several notches 3a are provided on the outer periphery of the stator 3 between the inner periphery of the hermetic container 1 and the refrigerant compressed by the compression element 5 and discharged into the hermetic container 1. The refrigerant that has passed through the notch 3a is discharged outward from the compressor through a discharge pipe 8 provided in the closed container 1.

However, in the above conventional example, the stator 3 is connected to the closed container 1.
When fixed to the stator 3, the airtight container 1 is fixed to the stator 3 as shown in FIG.
deforms along the external shape. This deformation also affects the fixed portion of the cylinder 7, resulting in poor roundness. Therefore, as shown in FIG. 6, unless the outer diameter of the cylinder 7 is made small, it cannot be inserted into the closed container 1, and the contact area between the cylinder 7 and the closed container 1 is reduced.

As a result, welding, etc. (thus, the rigidity when fixed is weakened, the necessary air gap is not maintained, and the compressor starts poorly or abnormal noise occurs when operating the compressor. Furthermore, the efficiency of the electric element 4 decreases, causing the compressor to This had the disadvantage of causing a decline in the coefficient of performance.

Purpose of the Invention The present invention has been made in view of the above-mentioned conventional drawbacks, and it is an object of the present invention to provide a cylinder structure that prevents startup failures and abnormal noises during compressor operation, and prevents a decrease in the coefficient of performance of the compressor. .

Structure of the Invention In order to achieve the above object, the present invention is such that the outer shape of a cylinder fixed to a closed container is made to almost match the outer shape of a stator. One embodiment will be described in detail.

1 to 3 are diagrams each showing the configuration of an embodiment of the present invention, and parts having the same functions as those in FIGS. 4 to 6 are given the same reference numerals.

The cylinder 9 is provided with a relief portion 9a that substantially coincides with the notch 3a of the stator 3, and is configured such that the notch 3a and the relief portion 9a substantially coincide in the axial direction when the compressor is assembled. Therefore, when the cylinder 9 is fixed to the closed container 1 by welding or the like, the outer circumference of the cylinder 9 substantially follows the inner circumference of the closed container 1, so that the cylinder 9 can be securely fixed to the closed container 1, and its rigidity is high.

Therefore, by maintaining an appropriate air gap,
The coefficient of performance of the compressor is caused by poor startup and abnormal noise caused by contact between the rotor 2 and stator 3 due to the magnetic force of the electric element 4 during compressor operation, and by a decrease in efficiency of the electric element 4 due to uneven air gaps. It is possible to prevent a decrease in

DETAILED DESCRIPTION OF THE INVENTION As described above, the present invention provides an electric element consisting of a rotor and a stator, and a compression element for compressing a refrigerant, disposed in a sealed container, and the electric element is connected to the outer peripheral surface of the stator and the hermetically sealed container. The compression element has a notch that serves as a refrigerant passage between the inner peripheral surface of the container and is fixed to the sealed container by means such as shrink fitting, and the compression element is connected to the outer peripheral surface of the cylinder having a compression space inside. It is fixed to the container by means such as welding, and the outer circumference l of the cylinder is fixed to the container by means such as welding.
This is provided with a relief part that almost matches the shape of the notch in the stator, and is constructed so that the notch in the stator and the relief part in the cylinder almost coincide in the axial direction when assembling the compressor. Due to the air gap, during compressor operation, the electric element is fixed with the rotor due to the magnetic force, which causes startup failures and abnormal noises caused by contact, and the efficiency of the electric element decreases due to the uneven air gap, resulting in poor performance of the compressor. This has many advantages such as being able to prevent the coefficient from decreasing.

[Brief explanation of drawings]

FIG. 1 is a vertical cross-sectional view of a hermetic compressor according to an embodiment of the present invention, FIG. 2 is a cross-sectional view taken along line A-A in FIG. 1, and FIG. 3 is a perspective view of a cylinder according to an embodiment of the present invention. , Fig. 4 is a vertical cross-sectional view of a conventional hermetic compressor, and Fig. 5 is taken along the line B-B in Fig. 4.
6 is a cross-sectional view taken along line CC in FIG. 4, and FIG. 7 is a perspective view of the stator. 1... airtight container, 2... rotor, 3.
...Stator, 4...Electric element, 5...
...Compression element, 9...Cylinder, 9a...
... Escape part. Name of agent: Patent attorney Toshio Nakao and 1 other person 2nd
Figure 3 Figure 4 Figure 5 (21 Figure 6! Figure 7

Claims (1)

[Claims] An electric element consisting of a rotor and a stator and a compression element for compressing a refrigerant are disposed in a sealed container, and the electric element has a refrigerant passage between an outer circumferential surface of the stator and an inner circumferential surface of the sealed container. The compression element has a notch and is fixed to the closed container by means such as shrink fitting, and the compression element is fixed to the closed container by means such as welding on the outer peripheral surface of a cylinder having a compression space inside,
Further, a relief portion is provided on the outer periphery of the cylinder, the shape of which substantially matches the notch shape of the stator, and the notch of the stator and the relief portion of the cylinder are configured to substantially match in the axial direction when assembling the compressor. Hermetic compressor.