JPH0278785A - Closed type scroll compressor - Google Patents

Abstract

PURPOSE:To prevent the bubbling of the oil stored in an oil reservoir by mounting a lower cap on the body lower end of a sealed vessel through a dashboard having recessed and protruded parts on the rising part of its outer circumferential part and having notches accorded with the recessed parts on its collar part. CONSTITUTION:A lower cap 16 is welded to the lower end of a closed vessel having a scroll type compressor part 2 disposed in the upper part and an electric motor 3 in the lower part through the collar 18a of a dashboard 18. The dashboard 18 is formed by integrally providing a flat plate part 18b, a rising part 18c having recessed and protruded parts, and the collar 18a nearly accorded with the rising part, and has such a constitution as forming a plurality of passages by the recessed parts and the inner wall of the closed vessel 1 by press-fitting the protruded parts to the inner wall of the closed vessel 1. When a part of the oil contained in a refrigerant gas introduced to the upper part of the electric motor 3 through a passage 1a is separated from the refrigerant gas, this oil is fallen into the electric motor 3 lower part and stored in an oil reservoir through the outer circumferential passages of the dashboard 18.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a hermetic scroll compressor, and in particular to a compressor O.
The present invention relates to an oil supply structure that supplies oil with less air bubbles to moving parts of a battery case.

[Conventional technology]

In the conventional device, as described in Japanese Patent Application Laid-Open No. 59-160089, a rising wall surrounding the coil end of the motor is provided at the bottom of the closed container.

A plurality of discharge holes are provided at the bottom of the rising wall to drain oil from inside the rising wall to an oil sump. Further, the rising wall is formed to surround the tL motive core, has a gap in the entire circumferential direction between it and the closed container, and is supported by a stay on the lower -+f knob.

[Problem that the invention seeks to solve]

Since the above-mentioned conventional technology is attached using a stay, it is necessary to attach by welding or the like, resulting in poor workability. In addition, the core was not sufficiently cooled by the rounded discharged gas which had a shape that wrapped around the electric lIh41i & core portion, resulting in an increase in the temperature of the motor. Furthermore, it is necessary to provide a stay, which has the disadvantage of increasing the number of parts.

The object of the present invention has been achieved based on the above-mentioned matters,
To provide a support plate for preventing oil agitation, which prevents oil mixed with air bubbles from being sucked into an oil supply pipe, sufficiently cools the lower part of an electric motor, and is easily installed.

[Means for layered solutions]

The purpose of this is to allow the lower end of the body of the airtight container to enter the lower cap, have a hole in the center of the lower part of the motor through which the oil supply pipe communicates, and provide unevenness on the rising part of the outer periphery.
The brim has a split plate with a notch that matches the recess.
By press-fitting the convex portion on the outer circumference into the body and simultaneously holding the rib portion between the end face of the body and the lower cap, installation is facilitated, and the raised recess on the outer circumference and the inner wall of the airtight container are By using the plurality of passages formed by the above as oil discharge holes, the kinetic energy of the refrigerant gas that cooled the outer periphery of the motor is reduced and transmitted to the oil reservoir, thereby preventing the oil from bubbling.

[Effect]

The discharged refrigerant gas is guided to the top of the electric J311 aircraft B. Here, a portion of the oil contained in the refrigerant gas is separated from the refrigerant gas. Further, a part of the refrigerant gas is guided to the lower part of the electric motor 8. Oil also falls to the bottom of the electric machine. The falling oil passes through the passage on the outer periphery of the dividing plate and is collected in the oil reservoir. This passage has a narrow gap so that it is difficult to transmit the kinetic energy of the refrigerant gas to the separating plate 1.
8, air bubbles generated in the upper part of the oil supply device 14 are prevented from reaching the surrounding parts of the oil supply device 14, and oil mixed with air bubbles is not sucked into the oil supply device, thereby providing good oil supply to the moving parts of each part of the compressor. conduct.

(Embodiment) An embodiment of the present invention will be described below with reference to Fig. 1 and the second factor. Fig. 1 shows a sectional view of the entire structure of a hermetic scroll compressor in which the present invention is implemented.

In FIG. 1, a compressor section 2 is disposed above a hermetic container 1, and an electric motor 8 is disposed below it, and an oil reservoir 4 for lubrication is formed at the bottom of the hermetic container 1. The compressor section 2 includes a fixed scroll 5 having two spiral-shaped knobs 5a on a base plate, and a spiral wrap 6 on the base plate.
The rotating scroll 6 has a frame 7 that is integrated with the fixed scroll 5 and supports the orbiting scroll 6, and has a structure in which the wraps of the fixed scroll 5 and the orbiting scroll 6 are engaged with each other.

Also, between the orbiting scroll 6 and the frame 7, there is an Oldham mechanism 8 for preventing rotation of the orbiting scroll 6. is provided. The electric motor 8 is press-fitted into the closed container 1, and
The orbiting scroll 6 is caused to orbit through the crankshaft 9.

The crankshaft 9 is mounted on the frame 7 and supported by a main bearing 10 and a lower bearing 11, and the crankshaft is fitted into an orbiting bearing 12 provided on the back surface of the orbiting scroll 6.

An oil supply passage 18° is provided in the crankshaft 9 to guide lubricating oil to the main bearing 10, lower bearing 11, and slewing bearing 12.
An oil supply device 14 is provided at the shaft end of the electric wh machine 8 to suck up lubricating oil from the oil reservoir 4 and feed it into the oil supply passage 18.

Further, a lower cap 16 is welded to the lower end of the airtight container l across the brim 18a of the divider plate 18. FIG. 2 is a perspective view of the divider plate 18.

The dividing plate 188 is integrally formed with a flat plate portion 18b1, a rising portion 18 having irregularities, and a collar 18a that substantially coincides with the rising portion C1. The convex portion is press-fitted into the inner wall of the closed container 10, and the recessed portion and the inner wall of the closed container 1 form a plurality of passages. Returning to FIG. 1, in the compressor section 2, when the orbiting scroll 6 is driven by the electric motor 8 or made to orbit through the shaft 9, the orbiting scroll also moves into the space formed by the fixed scroll 5. As the compression chamber moves toward the center of the scroll, its volume decreases to compress the sucked refrigerant gas. The compressed refrigerant gas is discharged from the discharge port 16 provided at the center of the base plate of the fixed scroll to the upper space 17 in the closed container. is discharged to.

Furthermore, an intermediate pressure chamber 15 is formed on the back surface of the orbiting scroll to which gas for the compression stroke is guided.

The pressure in the intermediate pressure chamber 15 is an intermediate pressure between the suction pressure and the discharge pressure of the refrigerant gas, and oil supply to the sliding portion of the scroll is performed using the differential pressure between the discharge pressure and the intermediate chamber pressure.

The upper end surface of the lower bearing 11 is at the pressure of the intermediate pressure chamber 15, and the pressure at the lower end is at the discharge pressure.

Further, an axial groove 19 is provided on the surface of the crankshaft 9 that slides on the lower bearing 11. An oil supply hole 20 is provided at the lower end of the axial groove 19 so as to communicate with the oil supply passage 18 . The f4 oil flows from the oil supply device 14 through the oil supply passage 18 and flows into the intermediate pressure chamber 15 via the oil supply hole 20 and the axial groove 19 on the one hand and the intermediate pressure chamber 15 after lubricating the swing bearing 12 on the other hand. The lubricating oil that has flowed into the intermediate pressure chamber 15 flows into the compression chamber through the intermediate hole 6b, and is mixed with the refrigerant gas and then flows into the upper space 17 of the closed container 117'i through the discharge port 16 provided at the center of the fixed scroll 5. Discharge to.

The discharged refrigerant gas is guided to the upper part of the electric motor 8 through the passage la. Here, a portion of the oil contained in the refrigerant gas is separated from the refrigerant gas. Also, some refrigerant gas is in the passage 3a.
It is guided to the lower part of the electric motor 8 through the electric motor 8. Also, oil and electric motor 8
Fall to the bottom. The fallen oil passes through the outer peripheral passage of the support plate 18 and is collected in the oil reservoir 4. This passage is a very narrow gap that makes it difficult to transmit the kinetic energy of the refrigerant gas to the oil reservoir. As described above, the passage of the partition plate 18 is structured so that the separated oil passes to the oil reservoir 4, but the refrigerant gas hardly passes therethrough.

Therefore, in the scroll compressor according to the present invention, the air bubbles generated at the upper part of the supporting plate 18 are prevented from reaching the surrounding area of the oil supply device 14, and the oil mixed with air bubbles is prevented from reaching the oil supply device 14. Since the oil will not be sucked in, the sliding parts of the pressurized J machine can be well supplied with oil.

[Invention p effect]

As explained above, according to the present invention, air bubbles generated in the upper part of the oil are prevented from reaching the surrounding area of the oil supply device, thereby preventing oil mixed with air bubbles from being sucked into the oil supply device. , the lubricating parts can be well supplied. In addition, the dividing plate is made of a single piece of drawn material, making it easier to attach it to the sealed container, improving work efficiency, and the structure in which the brim is sandwiched between the sealed container and the lower gap ensures that it will not shift due to vibrations, etc. is maintained.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal cross-sectional view showing the structure of a hermetic scroll compressor according to an embodiment of the present invention, and FIG. 2 is a perspective view of the support plate shown in FIG. 1. 1... Airtight container 2... Compressor section 5... Fixed scroll 6... Orbiting scroll 7... Frame 9... Crankshaft 10... Main bearing
11...Lower bearing 12...Swivel bearing 18.
...Oil supply passage 15...Intermediate pressure chamber 18...9 supporting plates. '< l Figure 1

Claims (1)

[Claims] 1. The compression mechanism is comprised of a pair of scrolls that rotate relative to each other, an electric motor that drives the compression mechanism, and an airtight container that houses them. In a scroll compressor that sucks oil from an oil sump at the bottom through an oil supply pipe connected to the lower end of the electric motor and supplies oil to each sliding part, the lower end of the body of the airtight container is inserted into the lower cap. Along with
The lower part of the electric motor in the body has a hole in the center part through which the oil supply pipe communicates, and a support plate with a rising part having a plurality of unevenness and a plurality of notches in the collar part is attached to the outer periphery. The convex portion is in close contact with the body, and at the same time, the collar is attached so as to be held between the end face of the body and the lower cap, and the portion formed by the concave portion and the inner wall of the body serves as a return passage. Hermetic scroll compressor.