JPH09158857A - Hermetic type motor-driven scroll compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a scroll compressor with high efficiency at low cost in which an adequate amount of lubricating oil required for the sealing of a compression work is supplied space without increasing the number of parts. SOLUTION: A sealing member 21 is arranged in a clearance between an end plate 24 of a swivel scroll 8 and a bearing member 17, the lubricating oil reserved inside a closed container 1 is acted in an inner area to be partitioned by means of the sealing member 21, an outer area 22 of the sealing member 21 communicates with a suction port 12 of a compression mechanism part 2, a axial direction hole 19 and a diameter direction hole 20 are opened at an axial part 9 of the swivel scroll 8 and at the end plate 24, respectively, both these holes communicate with a thin hole 18, and through this thin hole 18 the lubricating oil required for the sealing of a compression work space 13 is supplied from the inner area of the sealing member 21 to the outer area 22.

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 that boosts the pressure of air or refrigerant gas.

[0002]

2. Description of the Related Art A conventional hermetic electric scroll compressor is
As shown in FIG. 5, an electric motor 102 and a compression mechanism portion 105 for transmitting and driving the rotational force of the electric motor by a crankshaft 104 supported by a bearing member 103 are arranged inside the closed casing 101. ing. The compression mechanism section 1
Reference numeral 05 designates a fixed scroll 106 having fixed spiral blades.
And the orbiting scroll 107 arranged so as to form a plurality of compression work spaces 109 by meshing with the fixed scroll 106.
Since 07 has its rotation restrained by the Oldham ring 108, it makes a turning motion. As a result, the orbiting scroll 1
The volume of the compression work space 109 formed by the spiral blade of No. 07 and the spiral blade of the fixed scroll 106 sequentially decreases, and as a result, the gas is compressed. The compression efficiency in this type of scroll compressor depends on how much the leakage of the refrigerant gas from the contact surfaces of the blades of both scrolls forming the compression space is reduced. In order to reduce this leakage, a technique is known in which the lubricating oil stored in the closed container 101 is introduced into the compression work space 109 and sealed by the oil film.

In the conventional scroll compressor, the lubricating oil pumped up by the pump device passes through the inside of the crankshaft 104, lubricates the bearing portion 110 and the eccentric bearing 111, and branches a part thereof to form the orbiting scroll 107. Through the communication hole 112 provided in the shaft portion and the end plate of the compressor, and an appropriate amount is compressed by the throttle valve 113 installed in the end plate.
Refueled.

[0004]

In the scroll compressor described above, it is necessary to incorporate a separate component such as a throttle valve into the orbiting scroll, which increases the manufacturing cost of the throttle valve and the number of man-hours for incorporating the throttle valve. In addition, there is a problem in that the compression efficiency decreases because more than an appropriate amount of lubricating oil flows into the compression work space due to the difference in the coefficient of thermal expansion from the orbiting scroll due to the installation status during assembly and the temperature rise during operation. It was

The key portion of the Oldham ring and the key groove portion of the orbiting scroll into which the key portion is slidably fitted are in a boundary lubrication state, and when the amount of oil supplied to the key portion is insufficient, the Oldham ring key However, there have been problems such as abnormal wear of the portion or the orbiting scroll key groove, and an increase in input due to a decrease in mechanical efficiency.

Further, since the communication holes are provided in one direction, the lubricating oil is unbalancedly supplied, and sufficient sealing performance cannot be obtained.

The present invention solves the problems of the above-mentioned conventional example, and it is possible to eliminate the need for installing a separate component such as a throttle valve.
It is an object of the present invention to provide a low-cost, highly reliable, and highly efficient scroll compressor capable of uniformly supplying a lubricating oil required for a seal to a compression work space.

[0008]

[Means for Solving the Problems] Means for solving the above problems are as follows.

A first means is to dispose a seal member in a gap between the end plate of the orbiting scroll and the bearing member, and the lubricating oil accumulated inside the hermetically sealed container is provided in an inner region defined by the seal member. The outer region of the seal member is made to communicate with the suction port of the compression mechanism portion, and an axial hole is formed in the shaft portion of the orbiting scroll and a radial hole is formed in the end plate, and both holes are narrow holes. And to supply the lubricating oil from the inner region of the seal member to the outer region through the narrow hole.

In addition to the first means, the second means has a communication hole having a small hole in the shaft portion and end plate of the orbiting scroll, and a plurality of communication holes on the end plate side are provided. .

In addition to the first or second means, the third means has a communication hole in the shaft portion of the orbiting scroll, and communicates with this communication hole and the key groove portion provided on the end plate. The end plate is provided with a communication hole that is a small hole.

[0012]

The operation of the above means is as follows.

The operation of the first means is that an axial hole is formed in the shaft portion of the orbiting scroll and a radial hole is formed in the end plate, these holes are communicated with each other by a small hole, and a seal is made through this small hole. Since the lubricating oil is supplied from the inner area to the outer area of the member, the lubricating oil flows into the outer area communicating with the suction port of the compression mechanism portion and is taken into the compression work space together with the low pressure refrigerant gas.
The oil film forms a seal in the compression process.

The function of the second means is, in addition to the function of the first means, the shaft portion of the orbiting scroll and the end plate have a communication hole, a part of which is a fine hole. Since the lubricating oil is supplied from the inner area of the seal member to the outer area through the communication hole and the narrow hole,
Evenly, the lubricating oil flows into the outer area communicating with the suction port of the compression mechanism, is taken into the compression work space together with the low-pressure refrigerant gas, and the oil film seals in the compression process and the end plate of the orbiting scroll. A sufficient amount of lubricating oil can be evenly supplied to the upper surface of the fixed scroll, which slides against.

The operation of the third means is, in addition to the operation of the first or second means, a communication hole is provided in the shaft portion of the orbiting scroll, and the communication hole is further communicated with the key groove portion provided on the end plate. The end plate is provided with a communication hole, a part of which is a thin hole.Lubricant is supplied from the inner region of the seal member to the outer region through this thin hole, so that it communicates with the suction port of the compression mechanism. Lubricating oil flows into the outer region where it is present, is taken into the compression work space together with the low-pressure refrigerant gas, and the oil film can perform sealing in the compression process and supply sufficient lubricating oil to the key groove portion.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a compression mechanism portion 2, an electric motor portion 3, and a crankshaft 4 for transmitting the rotational force of the electric motor portion 3 to the compression mechanism portion 2 are arranged inside the closed casing 1.
Further, the closed container 1 is provided with a suction pipe 5 for sucking the low-pressure refrigerant gas, and a discharge pipe 6 for discharging the high-pressure refrigerant gas compressed by the compression mechanism section 2 to the outside of the closed container 1.

In the above structure, when the electric motor section 3 is driven, the rotational force generated thereby is transmitted to the compression mechanism section 2 by the crankshaft 4. At this time, the rotational force is transmitted from the eccentric bearing 7 provided on the crankshaft 4 through the shaft portion 9 of the orbiting scroll 8. Also, the orbiting scroll 8 is
Since the rotation is restricted by the Oldham ring 10,
As a result, the orbiting motion is performed in a state of meshing with the fixed scroll 11. Therefore, after passing through the suction pipe 5, the compression mechanism 2
The low-pressure refrigerant gas sucked from the suction port 12 is continuously compressed from the outer peripheral portion toward the central portion in the compression work space 13 formed by the orbiting scroll 8 and the fixed scroll 11. Then, the high-pressure refrigerant gas is discharged from the discharge port 14 of the compression mechanism portion 2 into the closed container 1, and thereafter,
It is discharged from the discharge pipe 6 to the outside of the closed container 1. on the other hand,
The lubricating oil pumped up from the lubricating oil sump 16 by the pump mechanism 15 provided at the end portion of the crankshaft 4 passes through the inside of the crankshaft 4, and a part of the lubricating oil branches to make the orbiting scroll 8
The shaft portion 9 and the bearing portion 26 that supports the crankshaft 4 are sequentially lubricated and then returned to the lubricating oil sump 16.

For the other lubricating oil, an axial hole 19 is bored in the shaft portion 9 of the orbiting scroll 8 and a radial hole 20 is bored in the end plate 24. As described above, oil is supplied to the outer area 22 defined by the seal member 21. The lubricating oil supplied from the outer region 22 is compressed by the communication groove 23 provided in the fixed scroll 11 into the compression work space 1
Enter 3 and seal.

In the second embodiment, in addition to the first embodiment,
As shown in FIG. 3, the end plate 24 of the orbiting scroll 8 is provided with a plurality of radial holes 20, some of which are the small holes 18, and the lubricating oil that has passed through the axial holes 19 has a plurality of radial holes 20. Since the oil is supplied to the outer region 22 of the seal member 21 through the small holes 18, the oil is evenly taken into the compression work space 13, and the oil film of the oil film seals the compression process. It is possible to evenly and sufficiently supply the lubricating oil to the upper surface of the fixed scroll 11 that slides with.

In the third embodiment, in addition to the first or second embodiment, the end plate 24 is provided with a radial hole 20 in which a part of the end plate 24 of the orbiting scroll 8 becomes a fine hole 18. It communicates with the key groove 25, and through this small hole 18,
Since the lubricating oil is supplied to the outer region 22 of the seal member 21, the lubricating oil is taken into the compression work space 13 and the oil film thereof seals in the compression process, and at the same time, the sufficient lubricating oil can be supplied to the key groove portion 25.

[0022]

The effects of the present invention are as follows.

The effect of the first invention is that a proper amount of lubricating oil is compressed by forming an axial hole in the shaft portion of the orbiting scroll and a radial hole in the end plate and connecting both holes with a fine hole. Since it is taken into the work space and the oil film seals it, leakage of the refrigerant gas during the compression process is reduced, and high compression efficiency can be obtained.

Further, since the amount of the lubricating oil can be easily set by the diameter or the length of the fine hole, it is not necessary to use a separate component such as a throttle valve as in the conventional case, and the manufacturing cost and the assembly process are reduced. In addition, it is possible to eliminate the variation in the amount of oil depending on the mounting condition.

In addition to the effect of the first aspect of the invention, the effect of the second aspect of the invention is such that the end plate of the orbiting scroll is provided with a plurality of communication holes, some of which are small holes, so that an appropriate amount of lubricating oil can be uniformly compressed. It is possible to take in the work space, perform sealing in the compression process by the oil film, and evenly supply sufficient lubricating oil to the upper surface of the fixed scroll that slides with the end plate of the orbiting scroll. This makes it possible to obtain high reliability.

The effect of the third invention is that, in addition to the first or second effect, the communicating hole provided in the end plate of the orbiting scroll, which is a small hole, is made to communicate with the key groove portion provided in the end plate. As a result, it is possible to take in the compression work space, perform the sealing in the compression process by the oil film, and supply sufficient lubricating oil to the key groove portion. As a result, the key portion of the Oldham ring or the key groove portion of the orbiting scroll does not cause abnormal wear, and the sliding loss in the key groove portion does not cause a decrease in mechanical efficiency.

As described above, according to the present invention, it is not necessary to use a separate component such as a throttle valve, and the lubricating oil required for sealing can be supplied to the compression work space at a low cost with high efficiency and high reliability. A scroll compressor of the nature can be provided.

[Brief description of the drawings]

FIG. 1 is a sectional view of a hermetic electric scroll compressor according to a first embodiment of the present invention.

FIG. 2A is an external view of an orbiting scroll according to the first embodiment of the present invention, and FIG. 2B is a sectional view of the orbiting scroll according to the first embodiment of the present invention.

FIG. 3A is an external view of an orbiting scroll according to a second embodiment of the present invention, and FIG. 3B is a sectional view of an orbiting scroll according to a second embodiment of the present invention.

FIG. 4 is an external view of an orbiting scroll according to a third embodiment of the present invention.

FIG. 5 is a partial sectional view of a conventional hermetic electric scroll compressor.

FIG. 6 is a sectional view of a throttle valve in a conventional hermetic electric scroll compressor.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 airtight container 2 compression mechanism part 3 electric motor part 4 crankshaft 5 suction pipe 6 discharge pipe 7 eccentric bearing 8 orbiting scroll 9 shaft part 10 Oldham ring 11 fixed scroll 12 suction port 13 compression work space 14 discharge port 15 pomp mechanism 16 lubricating oil Reservoir 17 Bearing member 18 Small hole 19 Axial hole 20 Radial hole 21 Seal member 22 Outer area 23 Communication groove 24 End plate 25 Key groove part 26 Bearing part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Seiji Aburaya 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Shoji Aoka, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co., Ltd. 72) Inventor Nara Tera Nara, 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (3)

[Claims] 1. A hermetically-sealed container is provided with a compressor and a compression mechanism for transmitting and driving a rotating force of the motor by a crank shaft supported by a bearing member. The compression mechanism comprises:
It is formed of a fixed scroll having a fixed scroll blade, an orbiting scroll arranged so as to mesh with the fixed scroll to form a plurality of compression work spaces, and an Oldham ring for restraining the rotation of the orbiting scroll. This orbiting scroll is formed by a shaft portion that transmits an orbiting motion from an eccentric bearing provided on the crankshaft and an end plate that serves as a base of the spiral blade, and a seal member is provided in a gap between the end plate and the bearing member. , The lubricating oil accumulated in the closed container is applied to the inner area defined by the seal member, and the outer area of the seal member is communicated with the suction port of the compression mechanism portion, and the shaft of the orbiting scroll is A hole in the axial direction and a hole in the radial direction are provided in the end plate, the both holes are communicated with each other through a narrow hole, and the outer region from the inner region of the seal member is connected through the narrow hole. Hermetic electric scroll compressor and supplying the lubricating oil to. 2. The hermetic scroll compressor according to claim 1, wherein the shaft portion and the end plate of the orbiting scroll have a communication hole, a part of which is a fine hole, and a plurality of the communication holes on the end plate side are provided. 3. A shaft hole of the orbiting scroll has a communication hole, and the communication hole is communicated with a key groove portion provided on the end plate.
The hermetic electric scroll compressor according to claim 1 or 2, wherein the end plate has a communication hole, a part of which is a small hole.