JPH0932777A - Closed electric compressor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To restrain generation of abnormal sound from a lubricating oil pump, to prevent abrasion and failures of the lubricating oil pump, so as to improve performance and reliability, by decreasing the effect of error of whirling of a crank shaft end part in a closed electric compressor. SOLUTION: In the structure of a lubricating oil pump 50 attached to the end of a crank shaft 2, a pump case 51 is thinned by arranging a strainer 57 and an oil sump part 55 in the positions facing a displacement gear pair 52 across a pump case cover 53, and a distance between the displacement gear pair 52 and a sub bearing member 4 of the electric compressor is shortened. In a case where the structure of the electric compressor is the lateral type or the vertical type, the type is coped with by change of the pump cover 54.

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 such as a scroll compressor or a rotary compressor used in an air conditioner or a refrigerator.

[0002]

2. Description of the Related Art Conventionally, hermetic electric compressors such as scroll compressors and rotary compressors have been used for cooling devices such as cooling and heating devices and refrigerators.

As a conventional technique of this type of compressor, a scroll compressor will be described as an example with reference to the drawings.

As shown in FIG. 5, inside the sealed container 10, the rotational force of the rotor 6 and the stator 5 which constitute the compression mechanism portion 1, the electric motor portion 7, and the electric motor portion 7 is transmitted to the compression mechanism portion 1. A crankshaft 2, a bearing member 3 supporting the crankshaft 2 and an auxiliary bearing member 4 are installed, and a container 11 for temporarily collecting the oil used for lubricating the bearing portion is arranged on the bearing member 3. . Further, the closed container 10 is provided with a suction pipe 8 for sucking the low-pressure refrigerant gas, and a discharge pipe 9 for discharging the high-pressure refrigerant gas compressed by the compression mechanism unit 1 to the outside of the closed container. A lubricating oil pump 150 is provided at the end of 2.

In the above structure, the rotor 6 of the electric motor section 7
When this rotates, this torque is transmitted to the compression mechanism 1 by the crankshaft 2. When the rotational force is transmitted to the compression mechanism 1, a compression action is generated in the refrigerant gas. As a result, the low-pressure refrigerant gas sucked through the suction pipe 8 is compressed into the high-pressure refrigerant gas by the compression mechanism portion 1 and once discharged into the discharge port side space 14 of the internal space of the hermetic container 10, and then the bearing member 3 Through the communication port 12 provided in the electric motor side space 17. After that, the main flow of the high-pressure refrigerant gas passes through the cutout portion 13 provided in the stator 5, and is finally discharged from the discharge pipe 9 into a refrigeration cycle (not shown).

On the other hand, the lubricating oil pump 150 is arranged at the end of the crankshaft 2 and is fitted and inserted into the auxiliary bearing member 4 to be attached. The end portion of the crankshaft 2 has a D-cut shape and is inserted into the D-cut hole of the positive displacement internal gear 52b. The drive force of the crankshaft 2 is transmitted to the positive displacement internal gear 52b via the crankshaft 2 and the D-cut shape portion of the positive displacement internal gear 52b, and the positive displacement internal gear 52b is transmitted.
b and a positive displacement external gear 52a
The lubricating oil pump 150 is operated by the pumping action generated by the meshing rotational movement of the. When the electric compressor is operating,
After the lubricating oil in the lubricating oil sump 15 in the lower portion of the closed container 10 is pumped from the oil suction port 158 of the lubricating oil pump 150 through the oil pumping nozzle 156 to the oil sump portion 155 provided inside the lubricating oil pump 150. , Pair of positive displacement gears 52 through strainer 157 to capture foreign matter in oil
Is supplied to. After that, oil is sent out to the oil passage 153b provided in the pump case cover 153 by the pumping action of the positive displacement gear pair 52, passes through the communication passage 16 provided in the crankshaft 2 from the oil passage 153b, and passes through the compression mechanism portion. 1
Supplied to Most of the lubricating oil lubricates the sliding surface between the bearing member 3 and the crankshaft 2 and the like, and then the bearing member 3
After being collected in the oil recovery container 11 disposed in the oil recovery container 11, it is discharged from the communication port 11a disposed in the oil recovery container 11 and falls by the action of gravity, and the lubricating oil sump 1 under the closed container 10
Return to 5. Further, the remaining lubricating oil is discharged from the compression mechanism portion 1 into the closed container 10 together with the high pressure refrigerant gas, and is separated from the high pressure refrigerant gas while moving inside the compressor, and likewise falls due to the action of gravity to close the closed container 10 Return to the lubricating oil sump 15 at the bottom of the.

[0007]

However, in the prior art, in addition to the positive displacement gear pair in the pump case of the lubricating oil pump, the strainer and the oil sump are provided side by side, so that the pump case in the axial direction of the compressor is The size is restricted by the size of the strainer attached and the size required for the oil sump when the pump case is made thin. Therefore, the distance between the positive displacement gear pair and the sub-bearing member is also set to be larger than the originally required dimension.Therefore, when the lubricating oil pump attached to the end of the crankshaft is driven, the tip of the crankshaft Due to the whirling error of the section, the positive displacement gear pair rotates in a twisted state with respect to the pump case or the crankshaft, or the positive displacement internal gear and the positive displacement gear engage with each other in a meshing motion. Therefore, there is a problem that abnormal noise is generated from the lubricating oil pump portion, wear of the positive displacement gear pair or the pump case progresses in the lubricating oil pump, and performance and reliability of the electric compressor are deteriorated. In order to avoid this problem by using the conventional technique, it becomes necessary to strictly set the design tolerance of each component of the crankshaft, the auxiliary bearing member and the lubricating oil pump.
For this reason, there has been a problem that high precision machining of parts and precision inspection and management after machining are required.

Further, since the position where the lubricating oil sump is arranged is different in the case where the electric compressor is of the horizontal type and the vertical type, the position where the lubricating oil sump is arranged is different from that of the lubricating oil sump. In order to pump the oil to the lubricating oil pump, it has been necessary to prepare a lubricating oil pump having specifications in which the oil pumping nozzles of the lubricating oil pump are arranged at different positions.

The present invention solves the above-mentioned problems of the conventional example, and constitutes a lubricating oil pump which can be applied regardless of whether the electric compressor is a horizontal type or a vertical type, and a whirling error at the tip of the crankshaft. It is an object of the present invention to provide an electric compressor with reduced performance and high performance and reliability.

[0010]

In order to solve the above problems, as a first means, a compression mechanism part is provided in a closed container,
An electric motor for driving the compression mechanism section and a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section are arranged below the compression mechanism section, and the end of the crankshaft is lubricated. In an electric compressor provided with an oil pump, the oil sump portion of the lubricating oil pump is arranged at a position facing the pump gear pair of the lubricating oil pump with the pump case cover of the lubricating oil pump interposed therebetween.

As a second means, a compression mechanism portion is provided in a closed container, an electric motor for driving the compression mechanism portion is provided below the compression mechanism portion, and a rotational force of the electric motor is transmitted to the compression mechanism portion. In the electric compressor in which a crankshaft for the above is arranged and a lubricating oil pump is arranged at the end portion of the crankshaft, the pump case cover of the lubricating oil pump is provided with a recess which is an oil passage and a communication port. ing.

[0012] As a third means, a compression mechanism portion in a closed container, an electric motor for driving the compression mechanism portion below the compression mechanism portion, and a rotational force of the electric motor are transmitted to the compression mechanism portion. In a pump case of the lubricating oil pump in an electric compressor in which a lubricating oil pump is arranged at an end of the crankshaft. It is arranged at a position facing the pump gear pair of the lubricating oil pump with the cover in between.

As a fourth means, a compression mechanism portion in a closed container, an electric motor for driving the compression mechanism portion below the compression mechanism portion, and a rotational force of the electric motor are transmitted to the compression mechanism portion. In the electric compressor in which a crankshaft for the above is provided and a lubricating oil pump is provided at an end portion of the crankshaft, an oil pumping nozzle is provided at a pump cover of the lubricating oil pump.

As a fifth means, a compression mechanism portion in a closed container, an electric motor for driving the compression mechanism portion below the compression mechanism portion, and a rotational force of the electric motor are transmitted to the compression mechanism portion. In the electric compressor in which a crankshaft for the above is disposed and a lubricating oil pump is disposed at the end of the crankshaft, a resin oil pumping nozzle is attached to the pump cover of the lubricating oil pump to cause plastic deformation due to heating. It is attached by processing using.

As a sixth means, in order to transmit a compression mechanism portion inside the closed container, an electric motor below the compression mechanism portion for driving the compression mechanism portion, and a rotational force of the electric motor to the compression mechanism portion. In the electric compressor in which the crankshaft is arranged and a lubricating oil pump is arranged at the end of the crankshaft, a slope is provided on the head of the pump cover of the lubricating oil pump, and an oil pumping nozzle is provided on this slope. It is constructed integrally with the pump cover.

As a seventh means, a compression mechanism portion inside a closed container, an electric motor for driving the compression mechanism portion below the compression mechanism portion, and a rotational force of the electric motor are transmitted to the compression mechanism portion. In the electric compressor in which a crankshaft for the above is provided and a lubricating oil pump is provided at the end of the crankshaft, the pump cover of the lubricating oil pump is made of resin.

As an eighth means, a compression mechanism portion in a closed container, an electric motor for driving the compression mechanism portion below the compression mechanism portion, and a rotational force of the electric motor are transmitted to the compression mechanism portion. In the electric compressor in which a crankshaft for the above is provided, and a lubricating oil pump is provided at the end of the crankshaft, the frame portion of the strainer of the lubricating oil pump is made of resin and formed into a thin circular shape. ing.

As a ninth means, a compression mechanism portion is provided in the closed container, an electric motor for driving the compression mechanism portion is provided below the compression mechanism portion, and a rotational force of the electric motor is transmitted to the compression mechanism portion. In the electric compressor in which a crankshaft for the above is provided and a lubricating oil pump is provided at the end of the crankshaft, the end surface portion of the strainer of the lubricating oil pump is provided at the end surface portion of the pump cover of the lubricating oil pump. It is arranged in a slightly protruding position.

[0019]

According to the first means, since the oil sump portion of the lubricating oil pump is arranged at a position facing the positive gear pair with the pump case cover interposed therebetween, the pump case can be made thin and the positive gear Since the distance between the pair and the sub-bearing member can be shortened, the whirling error of the tip end portion of the crankshaft can be reduced and the twisting movement of the positive displacement gear pair can be suppressed.

According to the second means, in addition to the concave oil passage in the pump case cover, the communication hole for the pump gear pair is provided, so that the oil sump of the lubricating oil pump is sandwiched by the pump case cover. Since it can be installed at a position facing the pump gear pair, the distance between the positive displacement gear pair and the sub-bearing member can be shortened, and whirling motion of the positive displacement gear pair can be suppressed by suppressing the whirling error of the crankshaft tip. Can be suppressed.

According to the third means, since the strainer is arranged at a position facing the positive displacement gear pair with the pump case cover interposed therebetween, the pump case is made thin and the positive displacement gear pair and the auxiliary bearing member are provided. Since the distance can be shortened,
It is possible to suppress the whirling error of the tip end portion of the crankshaft and suppress the twisting movement of the positive displacement gear pair.

According to the fourth means, since the oil pumping nozzle is arranged on the pump cover of the lubricating oil pump, only the pump cover can be used in correspondence with the structure of the electric compressor of the horizontal type or the vertical type. Since the lubricating oil pump can be configured by replacing the above, the whirling error at the tip of the crankshaft is small, and the lubricating oil pump that suppresses the twisting movement of the positive gear pair can be shared.

According to the fifth means, since the oil pumping nozzle made of resin is attached to the pump cover constituting the oil reservoir of the lubricating oil pump by processing utilizing the property of plastic deformation due to heating, the oil pumping is performed. The nozzle can be attached to the pump cover by simple processing.

According to the sixth means, the head of the pump cover forming the oil reservoir of the lubricating oil pump is provided with an inclined surface, and the oil pumping nozzle is integrally formed with the pump cover on this inclined surface. Since there is no joint surface between the pump cover and the oil pumping nozzle, there is no oil leakage from the pump cover, and it is possible to provide a highly reliable pump cover with stable lubrication capacity of the lubricating oil pump.

According to the seventh means, since the pump cover is made of resin, the pump cover and the oil pumping nozzle can be integrally constructed and manufactured, and can be provided at low cost.

According to the eighth means, since the frame portion of the strainer is made of resin and has a thin circular shape,
Since the strainer can be provided at a low cost and the lubricating oil pump can be made smaller and thinner, the distance between the positive displacement gear pair and the auxiliary bearing member can be shortened, and the whirling error at the tip of the crankshaft can be kept small. The twisting motion of the gear pair can be suppressed.

According to the ninth means, since the end surface portion of the strainer constituting the lubricating oil pump is arranged so as to slightly project from the end surface portion of the pump cover, oil leakage at the end surface of the strainer is prevented. On the other hand, since the seal surface is formed and oil leakage from the pump cover can be prevented, it is possible to provide a highly reliable pump cover with a stable oil supply capacity of the lubricating oil pump.

[0028]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A closed electric compressor according to one embodiment of the present invention will be described below with reference to the drawings, taking a closed electric scroll compressor as an example.

In FIG. 1, the pump case 51 is fitted and attached to the sub bearing member 4. The pump case 51 includes a positive displacement external gear 52a and a positive displacement internal gear 52.
The pump gear pair 52 constituted by b is mounted, and the positive displacement gear pair 52 is enclosed in the pump case 51 by attaching the pump case cover 53 to the pump case 51. Further, a D-cut shaped hole is provided in the center of the positive displacement internal gear 52b, and the D-cut shaped end portion of the crankshaft 2 is fitted and inserted into this hole so that the driving force by the crankshaft 2 is increased. The lubricating oil pump 50 is actuated by the pumping action transmitted to the internal mold gear 52b and caused by the meshing rotational movement of the positive displacement gear pair 52 constituted by the positive internal gear 52b and the positive external gear 52a.

On the other hand, the pump cover 54 is attached so as to face the positive gear pair 52 with the pump case cover 53 interposed therebetween, and the pump cover 54 and the pump case cover 5 are attached.
The oil sump portion 55 is constituted by 3. Further, the pump cover 54 is provided with a stepped portion, and a strainer 57 having a circular thin shape and a stainless steel mesh attached to a resin frame is fitted and inserted into the stepped portion.
The end surface of the resin frame slightly projects in the axial direction of the compressor with respect to the end surface of the pump cover 54. Therefore, when the pump cover 54 is fastened to the auxiliary bearing member 4 together with the pump case cover 53 and the pump case 51 with screws, both end surfaces of the strainer 57 are sandwiched between the stepped portion of the pump cover 54 and the pump case cover 53 and are in close contact with each other. Therefore, the oil does not leak from the oil sump 55 to the outside of the lubricating oil pump 50. Further, the head of the pump cover 54 has a pipe shape protruding inward, and an oil pumping nozzle 56 made of a resin tube such as Teflon is inserted into this pipe-shaped portion, and the pipe protruding inward. The tube is attached by being folded along the shape using the property of plastic deformation due to heating.
The oil suction port 58 at the tip of the oil pumping nozzle is arranged in the lubricating oil sump 15 in the closed container 10.

With the above construction, the driving force of the crankshaft 2 is transmitted to the positive displacement gear pair 52 during operation of the electric compressor. At this time, according to the configuration of the lubricating oil pump 50 of the present invention,
Since the distance between the auxiliary bearing member 4 and the positive displacement gear pair 52 can be set shorter than that of the configuration of the lubricating oil pump 50 according to the related art, the whirling error at the tip end portion of the crankshaft 2 can be suppressed to a small value. The rotational movement of the crankshaft 2 is transmitted to the positive displacement gear pair 52 disposed at the end of the positive displacement gear 52a and the positive displacement internal gear 52b without twisting. Further, the positive displacement gear pair 52 and the pump case 5 are caused by the whirling error of the tip portion of the crankshaft 2.
Since the twisting movement with respect to No. 1 is eliminated, the wear of the positive displacement gear pair 52 or the pump case 51 does not progress, but the abnormal noise due to the driving of the positive displacement gear pair 52 does not occur.

The flow of oil when the lubricating oil pump is driven in this embodiment is as described below. When the lubricating oil pump 50 operates, the oil in the lubricating oil sump 15 of the compressor is pulled up through the oil suction nozzle 58 from the oil suction port 58 by the pumping action of the positive displacement gear pair 52, and the oil sump portion 5
It is led to 5. Further, since the pump case cover 53 is provided with the communication port 53a, the oil in the oil sump portion 55 is supplied to the positive gear pair 52 through the communication port 53a. At this time, the strainer 57 fitted and inserted into the pump cover 54 is arranged so as to cover the communication port 53a. Therefore, when foreign matter is contained in the oil in the oil sump 55, the strainer 57 is To be captured. Positive gear pair 5
The oil supplied to No. 2 is guided by the pump action through the oil passage 53b provided in the pump case cover 53 to the communication port 16 provided in the crankshaft, and finally supplied to the compression mechanism unit 1.

In addition to this embodiment, as shown in FIG. 2, an inclined surface may be provided on the head of the pump cover 54a, and the oil pumping nozzle 56a may be machined and formed integrally with the pump cover 54a from this inclined surface. .

Further, as shown in FIG. 3, the pump cover 54
b may be integrally formed with resin by the oil pumping nozzle 56b.

Further, by replacing the pump cover 54 shown in FIG. 1 with a pump cover 54c having a shape as shown in FIG. 4, the lubricating oil pump 50 according to the present invention is constructed even in a vertically installed electric compressor. it can.

Although the embodiments of FIGS. 1 to 4 have described the example of the hermetic electric scroll compressor, the present invention is not limited to the scroll compressor, and other hermetic electric compressors, for example, hermetic type. It goes without saying that it is applied to a rotary compressor.

[0037]

According to the present invention, as is apparent from the above description,
The distance between the positive displacement gear pair of the lubricating oil pump attached to the end of the crankshaft and the auxiliary bearing member is shortened, and the effect of whirling error at the end of the crankshaft is suppressed to a sufficiently small level. It prevents the generation of abnormal noise and wear failure of the lubricating oil pump, and downsizes the lubricating oil pump.
It is possible to provide a lubricating oil pump which is configured to be thin and has a stable oil supply capacity. Further, the lubricating oil pump according to the present invention has an effect that it can be commonly used when the configuration of the electric compressor is a horizontal type and a vertical type, and provides a wide range of compressors with high performance and reliability at low cost. can do.

[Brief description of drawings]

FIG. 1 is a partial cross-sectional view of a hermetic electric scroll compressor according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view of a hermetically-sealed electric scroll compressor according to a second embodiment of the present invention.

FIG. 3 is a partial sectional view of a hermetic electric scroll compressor according to a third embodiment of the present invention.

FIG. 4 is a vertical sectional view of a hermetically-sealed electric scroll compressor according to a fourth embodiment of the present invention.

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

[Explanation of symbols]

 1 Compression Mechanism 2 Crankshaft 3 Bearing Member 4 Sub Bearing Member 5 Stator 6 Rotor 10 Sealed Container 15 Lubricating Oil Reservoir 16 Communication Port 50 Lubricating Oil Pump 51 Pump Case 52 Positive Gear 52a Positive External Gear 52b Positive Internal gear 53 Pump case cover 53a Communication port 53b Oil passage 54 Pump cover 55 Oil sump 56 Oil pumping nozzle 57 Strainer 58 Oil suction port

 ─────────────────────────────────────────────────── ─── Continued front page (72) Inventor Toshiharu Yasu 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. (72) Seiji Aburaya, 1006 Kadoma, Kadoma City, Osaka Matsushita Electric Industrial Co. 72) Inventor Shoji Aoka 1006 Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd.

Claims (9)

[Claims] 1. A compression mechanism portion in a closed container, and an electric motor below the compression mechanism portion for driving the compression mechanism portion.
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section is arranged, and a lubricating oil pump is arranged at an end of the crankshaft. Is disposed at a position facing the positive displacement gear pair of the lubricating oil pump with the pump case cover of the lubricating oil pump interposed therebetween. 2. A compression mechanism part in a closed container, and an electric motor for driving the compression mechanism part below the compression mechanism part,
A pump case cover of the lubricating oil pump, wherein a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism portion is provided, and a lubricating oil pump is provided at an end portion of the crankshaft. A hermetically-sealed electric compressor characterized in that a recess, which is an oil passage, and a communication port are provided together. 3. A compression mechanism section in a closed container, and an electric motor for driving the compression mechanism section below the compression mechanism section,
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section is arranged, and a lubricating oil pump is arranged at an end of the crankshaft. A hermetic electric compressor characterized in that a strainer for capturing foreign matter is arranged at a position facing a positive displacement gear pair of the lubricating oil pump with a pump case cover of the lubricating oil pump interposed therebetween. 4. A compression mechanism section in a closed container, and an electric motor for driving the compression mechanism section below the compression mechanism section,
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism portion is arranged, and a lubricating oil pump is arranged at an end portion of the crankshaft, in a pump cover of the lubricating oil pump. An enclosed electric compressor having an oil pumping nozzle. 5. A compression mechanism section in a closed container, and an electric motor below the compression mechanism section for driving the compression mechanism section.
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism portion is arranged, and a lubricating oil pump is arranged at an end portion of the crankshaft, in a pump cover of the lubricating oil pump. A hermetic electric compressor characterized in that a resin oil pumping nozzle is attached by processing utilizing the property of plastic deformation due to heating. 6. A compression mechanism section in a closed container, and an electric motor for driving the compression mechanism section below the compression mechanism section,
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section is arranged, and a lubricating oil pump is arranged at an end of the crankshaft. A hermetic electric compressor characterized in that an inclined surface is provided on the head, and an oil pumping nozzle is integrally formed with the pump cover on this inclined surface. 7. A compression mechanism section in a closed container, and an electric motor for driving the compression mechanism section below the compression mechanism section,
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism section is arranged, and a lubricating oil pump is arranged at an end of the crankshaft. A hermetic electric compressor that is made of resin. 8. A compression mechanism portion in a closed container, and an electric motor for driving the compression mechanism portion below the compression mechanism portion,
A strainer frame of the lubricating oil pump, wherein a crankshaft for transmitting the rotational force of the electric motor to the compression mechanism portion is provided, and a lubricating oil pump is provided at an end portion of the crankshaft. A hermetically-type electric compressor characterized in that the part is made of resin and configured into a thin circular shape. 9. A compression mechanism section in a closed container, and an electric motor for driving the compression mechanism section below the compression mechanism section,
A crankshaft for transmitting the rotational force of the electric motor to the compression mechanism portion is arranged, and a lubricating oil pump is arranged at an end portion of the crankshaft, wherein an end surface of a strainer of the lubricating oil pump is provided. A hermetically sealed electric compressor characterized in that the portion is arranged to slightly project from the end surface portion of the pump cover of the lubricating oil pump.