JPH0921385A - Enclosed electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To allow to install an internal protector with a large outer size, by providing a recess observed from the inner side in the position corresponding to the setting position of the internal protector on the outer peripheral wall of an enclosed housing. SOLUTION: The figure (b) shows the A-A cross section of the figure (a). To the outer peripheral surface Mb12 of the upper end coil Mb1 of the stator Mb of an electric motor M, an internal protector 33 with the outer size larger than the conventional one is fixed. At the position on the outer periphery of an enclosed housing 8 corregponding to the internal protector 33, a recess is provided. As a result, a space to house the internal protector 33 can be formed between the inner surface of the recess 81 and the outer peripheral surface Mb12 of the end coil Mb1 , and the internal protector 33 with a large outer size can be installed. Consequently, the selecting scope of the protector is expanded, and the protective scope of a motor is also expanded.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hermetic electric compressor.

[0002]

2. Description of the Related Art FIG. 3 is a vertical sectional view of a conventional hermetic electric compressor. In the figure, the inside of the closed housing 8 is provided with a discharge cover 31 so that a high pressure side 44 and a low pressure side 45 are formed.
And is divided into. Inside the low voltage side 45, a scroll type compression mechanism C is arranged at an upper part thereof, and an electric motor M is arranged at a lower part thereof, which are interlockingly coupled to each other via a rotary shaft 5. The electric motor M includes a rotor Ma and a stator Mb. The rotor Ma is fixed to the rotary shaft 5, and the stator Mb is fixed by being press-fitted into the hermetic housing 8.

The scroll type compression mechanism C allows the orbiting orbiting motion of the fixed scroll 1, the orbiting scroll 2 and the orbiting scroll 2, but the rotation preventing mechanism 3 such as an Oldham link for preventing its rotation and the fixed scroll 1 are fastened. The frame 6 includes an upper bearing 71, a lower bearing 72, and the like that pivotally support the rotating shaft 5.

The fixed scroll 1 is provided with an end plate 11 and a spiral wrap 12 provided upright on the inner surface of the end plate 11.
A discharge port 13 is provided in the central portion of the. The orbiting scroll 2 includes an end plate 21 and a spiral wrap 22 provided upright on the inner surface of the end plate 21, and a drive bush 54 is freely rotatable in a boss 23 provided on the outer surface of the end plate 21 via an orbiting bearing 73. An eccentric pin 53 protruding from the upper end of the rotary shaft 5 is slidably fitted into a slide hole 55 formed in the drive bush 54.

The fixed scroll 1 and the orbiting scroll 2 are eccentric with respect to each other by a predetermined distance, and are meshed with each other at an angle of 180 degrees so that the side surfaces of the spiral wraps 12 and 22 are lined at several points. A plurality of sealed spaces 24 that are in contact with each other and are symmetrical in the radial direction are formed. A fixed scroll 1 is provided at the center of the discharge cover 31.
Discharge port 14 provided in the end plate 11 of the valve, and a reed valve type discharge valve 17 that opens and closes the discharge hole 14.
Is provided. An oil pump 51 is installed at the lower end of the rotary shaft 5, and an intake port 56 of the oil pump 51 is installed.
Is open at the bottom of the closed housing 8 and the discharge port 5
7 communicates with an oil supply hole 52 formed in the rotary shaft 5.

In this compressor, the orbiting scroll 2 is driven by the orbiting mechanism composed of the rotating shaft 5, the eccentric pin 53, the drive bush 54, the boss 23, etc. by driving the electric motor M, and the orbiting scroll 2 is a rotation preventing mechanism. While being prevented from rotating by 3, it makes a revolution revolution motion on a circular orbit having a radius of revolution revolution. Then
Gas enters the low pressure side 45 through the suction pipe 82, and the passage 61
Through the low pressure chamber 43 and is sucked into the closed space 24. Then, this gas reaches the central portion while being compressed as the volume of the closed space 24 decreases due to the orbiting movement of the orbiting scroll 2, and when the closed space 24 communicates with the discharge port 13, the gas is discharged from the discharge port 13. The discharge valve 17 is pushed open through the hole 14, enters the high pressure side 44, and is discharged from there through the discharge pipe 83.

At the same time, the lubricating oil stored at the bottom of the hermetic housing 8 is sucked up by the oil pump 51 from the suction port 56, passes through the oil supply hole 52 from the discharge port 57, the lower bearing 72, the upper bearing 71, the eccentric pin 53, It is supplied to the sliding parts such as the slewing bearing 73 and lubricates them. Reference numeral 18 denotes a valve retainer, which is fastened to the discharge cover 31 by a bolt 19 together with the discharge valve. This regulates the valve opening height of the discharge valve 17, and causes, for example, a liquid compression phenomenon to cause a discharge valve 17
Is to prevent the discharge valve 17 from being plastically deformed so as not to close and to prevent the discharge valve 17 from being damaged by fatigue failure.

On the upper end surface Mb ₁₁ of the upper end coil Mb ₁ of the stator Mb of the electric motor M, an internal protector 32 for cutting the circuit of the electric motor M due to the rise of current and temperature to prevent the electric motor from being damaged is attached. It is fixed with tape or tape.

[0009]

In the above conventional hermetic electric compressor, when the internal protector 32 is attached to the electric motor M to protect the electric motor M,
The upper end surface M of the upper end coil Mb ₁ of the stator Mb
It had to be fixed to b ₁₁ . When the internal protector 32 is mounted due to such restrictions of the mounting position, in order to prevent it from coming into contact with the lower surface of the compression mechanism C, the balance weight 58 mounted on the rotor Ma, and the inner surface of the hermetically sealed housing 8, the external dimensions are large. Null protector 3
There was a problem that 2 could not be installed. Further, due to such restrictions on the external dimensions, the selection range of the internal protector 32 cannot be expanded.

The present invention solves the above-mentioned drawbacks of the prior art and makes it possible to mount an internal protector having a large external size.

[0011]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, in which a compression mechanism and an electric motor connected via a rotary shaft are housed and installed in a hermetically sealed housing, and the electric motor is The present invention relates to a hermetic electric compressor having an internal protector fixedly installed on a stator winding and having the following characteristics. (1) A recessed portion viewed from the inside is provided at a position corresponding to the installation position of the internal protector on the outer peripheral wall of the hermetically sealed housing, and a storage space for the internal protector is formed or expanded in the outer peripheral direction of the hermetically sealed housing to obtain external dimensions. It is possible to install a large internal protector. (2) In the hermetic electric compressor according to the above (1), an internal protector is fixed to an outer peripheral surface of an upper end coil of a stator winding of an electric motor, and a hermetic housing corresponding to the internal protector. A recess was seen from the inside. (3) In the hermetic electric compressor according to the above item (1), an internal protector is fixed to an upper end surface of an upper end coil of a stator winding of an electric motor, and a hermetic housing corresponding to the internal protector. A recess was seen from the inside.

[0012]

1 is a two-sided view of a hermetic electric compressor according to a first embodiment of the present invention, in which (a) is a longitudinal sectional view and (b) is a partial transverse sectional view ((a 3 is a sectional view taken along line AA of FIG. In the figure, an internal protector 33 having a larger outer dimension than the conventional one is fixed to the outer peripheral surface Mb ₁₂ of the upper end coil Mb ₁ of the stator Mb of the electric motor M, and the inner protector 33 on the outer periphery of the hermetic housing 8 is fixed to the inner protector 33. Recesses 81 are provided at corresponding positions.
With this, a space for accommodating the internal protector 33 can be formed between the inner surface of the recess 81 and the outer peripheral surface Mb ₁₂ of the end coil Mb ₁ , so that the internal protector 33 having a large external dimension can be mounted, and the internal protector 33 can be attached. The selection range of the null protector 33 is expanded, and the protection range can be expanded with respect to motor protection. Other components and operations are similar to those of the conventional one shown in FIG. 3, and corresponding members are designated by the same reference numerals.

FIG. 2 is a two-sided view of a hermetic electric compressor according to a second embodiment of the present invention, where (a) is a vertical sectional view and (b) is a sectional view.
FIG. 3 is a partial transverse sectional view (BB sectional view of (a)). As shown in the drawing, when the height of the internal protector 33 is not so large, this is set to the stator M of the electric motor M.
It can also be fixed to the upper end surface Mb ₁₁ of the upper end coil Mb ₁ of b. A concave portion 82 is provided on the outer periphery of the hermetically sealed housing 8 at a position corresponding to the internal protector 33, and the accommodation space of the internal protector 33 above the upper end coil Mb ₁ is enlarged in the outer peripheral direction. Since the recess 82 can be shallower in depth than the recess 81 of the first embodiment, it is easy to process and is suitable for application when the height of the internal protector is small.

[0014]

According to the hermetic electric compressor of the present invention,
Since a recess seen from the inside is provided at a position corresponding to the installation position of the internal protector on the outer peripheral wall of the hermetically sealed housing, and an accommodation space for the internal protector is formed or expanded in the outer peripheral direction of the hermetically sealed housing, the external shape is larger than the conventional one. An internal protector with a large size can be attached, and the selection range of the protector is expanded, and the motor protection range can be expanded.

[Brief description of drawings]

FIG. 1 is a two-sided view of a hermetic electric compressor according to a first embodiment of the present invention, in which (a) is a vertical sectional view and (b) is a partial lateral sectional view.

FIG. 2 is a two-sided view of a hermetic electric compressor according to a second embodiment of the present invention, in which (a) is a longitudinal sectional view and (b) is a partial lateral sectional view.

FIG. 3 is a vertical sectional view of a conventional hermetic electric compressor.

[Explanation of symbols]

5 Rotating shaft 8 Sealed housing 32 Internal protector 33 Internal protector (large size) 81 Recessed portion 82 Recessed portion C Compression mechanism M Electric motor Ma Rotor Mb Stator Mb ₁ Upper end coil Mb ₁₁ Upper end surface Mb ₁₂ Outer peripheral surface

Claims (3)

[Claims] 1. A compression mechanism and an electric motor, which are connected via a rotary shaft, are housed and installed in a hermetic housing, and an internal protector for protecting the stator winding of the electric motor is fixedly installed. In the hermetic electric compressor according to the above, a recess viewed from the inside is provided at a position corresponding to the installation position of the internal protector on the outer peripheral wall of the hermetic housing, and a storage space for the internal protector is formed in the outer peripheral direction of the hermetic housing. A hermetic electric compressor that has been expanded. 2. An internal protector is fixed to an outer peripheral surface of an upper end coil of a stator winding of an electric motor, and a recess seen from the inside is provided in a hermetically sealed housing corresponding to the internal protector. The hermetic electric compressor according to claim 1. 3. An internal protector is fixed to an upper end surface of an upper end coil of a stator winding of an electric motor, and a recess seen from the inside is provided in a hermetically sealed housing corresponding to the internal protector. The hermetic electric compressor according to claim 1.