JP2005282544A - Scroll compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a scroll compressor capable of preventing lubricating oil from leaking out of a compressor, so called oil rise, and of effectively cooling a motor by suitably separating lubricating oil contained in delivery gas. <P>SOLUTION: In a scroll compressor having a compression part 2 and the motor 3 driving the compression part arranged at an upper and a lower part in a hermetic vessel 1, having a space in the hermetic vessel divided into an upper space 11 of an upper part of the compression part, a middle space 3c provided with a delivery pipe formed between the compression part and the motor, and a lower space 3d provided with an oil reservoir 14 of lubricating oil supplied to the compression part, a partition plate 16 partitioning the middle space into a opening part side of the delivery pipe 10 and an inner side of the middle space is provided, a passage making gas delivered from the compression part and excess lubricating oil supplied to the compression part pass through the motor from an inner side of the partition plate and leading the same to the lower space and a passage 21 making gas flow out of the compressor from the delivery pipe along an inner wall of the hermetic vessel from the lower space are provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  TECHNICAL FIELD The present invention relates to a scroll compressor, and more particularly, to satisfactorily separate lubricating oil contained in a discharge gas, to prevent so-called oil rising from flowing out of the compressor, and to drive an electric motor. The present invention relates to an improvement for effectively cooling the air.

  A conventional scroll compressor that prevents the separated lubricating oil in the refrigerant gas from going out of the compressor is shown in FIG. 6 (see, for example, Patent Document 1). ).

  A compression unit 2 ′ is disposed above the sealed container 1 ′, and a stator 3b ′ fixed inside the sealed container 1 ′ below, and a rotor 3a ′ driven and rotated by the stator 3b ′. Is provided.

  A discharge chamber 11 ′ in which compressed gas is discharged from a discharge port 4 c ′ provided in the fixed scroll 4 ′ and an electric motor chamber 3 c ′ in which the electric motor 3 ′ is accommodated are partitioned by the compression section 2 ′ in the sealed container 1 ′. At the same time, a plurality of oil return passages 12 ′ are provided along the inner wall surface of the sealed container 1 ′ to connect the discharge chamber 11 ′ and the motor chamber 3 c ′, while the discharge chamber 11 is provided inside the oil return passage 12 ′. A plurality of refrigerant gas passages 13 communicating with the motor chamber 3c are provided, the lubricating oil is separated from the discharge gas, the lubricating oil is stored in an oil reservoir at the bottom of the sealed container 1 ', and this lubricating oil is supplied from the oil pump. It is configured to be sucked up by an oil supply mechanism and supplied to each sliding part of the compression part 2 ′.

  In addition, a suction pipe 9 ′ for sucking refrigerant is connected to the suction chamber 2 a ′ of the compression section 2 ′, and a compression section is provided between the compression section 2 and the motor 3 of the motor chamber 3 c ′ that houses the motor 3 ′. A discharge pipe 10 ′ for discharging the refrigerant compressed at 2 ′ to the outside of the sealed container 1 ′ is connected.

  Further, in the electric motor chamber 3c ′ between the compression unit 2 ′ and the electric motor 3 ′, an annular partition member 16 ′ that isolates the lubricating oil flowing from the oil return passage 12 ′ and the discharge gas discharged from the refrigerant gas passage 13 ′. Is provided.

  And the structure provided so that the lower part of said partition member 16 'may enter between the coil end of stator 3b' of motor 3 ', and the inner wall face of airtight container 1', or the downward direction of partition member 16 spreads outside. With the formed configuration, the lubricating oil is hardly mixed and dissolved in the compressed gas discharged from the refrigerant gas passage 13, and the outflow of the lubricating oil from the discharge pipe 10 into the refrigeration cycle can be reduced.

However, in the case of the above configuration, the oil separation is performed by causing the discharge gas to collide with the inner wall of the sealed container 1 ′ in the discharge chamber 11 ′ and separating by gravity, so that the oil separation efficiency is not sufficient, and the oil chamber 3 c ′ Most of the gas discharged to the gas flows from the upper part of the electric motor 3 ′ to the discharge pipe 10 ′ and does not pass through the electric motor 3 ′. Therefore, there is a problem that the electric motor 3 ′ is not sufficiently cooled.
Japanese Patent Laid-Open No. 2003-3974

  In view of the above problems, the present invention provides a partition plate in a middle space where a discharge pipe formed between a compression unit and an electric motor is provided, and guides the discharge gas and drained oil to the lower part of the electric motor. A scroll compressor capable of effectively separating the lubricating oil contained in the compressor, preventing the so-called oil climbing out of the compressor, and effectively cooling the motor. With the goal.

In order to solve the above-mentioned problem, the present invention arranges a compression part and an electric motor for driving the compression part above and below in the sealed container, and defines the space in the sealed container as the upper space above the compression part, In a scroll compressor partitioned into a middle space provided with a discharge pipe formed between a compression section and the electric motor, and a lower space provided with an oil reservoir for lubricating oil supplied to the compression section below the electric motor ,
A passage for guiding the gas containing the lubricating oil discharged from the compression section and the lubricating oil supplied to the compression section to the lower space; and the gas from the lower space through the discharge pipe to the outside of the compressor It is the structure which forms the channel | path which leads to.

In addition, a compression unit and an electric motor that drives the compression unit are arranged above and below in the sealed container, and a space in the sealed container is formed between the upper space above the compression unit and between the compression unit and the motor. In a scroll compressor partitioned into a middle space provided with a discharge pipe and a lower space provided with an oil reservoir for lubricating oil to be supplied to the compression portion below the motor,
A passage for guiding the gas containing the lubricating oil discharged from the compression section and the lubricating oil supplied to the compression section to the lower space; and the gas from the lower space through the discharge pipe to the outside of the compressor It is the structure formed by partitioning the passage leading to

In addition, a compression unit and an electric motor that drives the compression unit are arranged above and below in the sealed container, and a space in the sealed container is formed between the upper space above the compression unit and between the compression unit and the motor. In a scroll compressor partitioned into a middle space provided with a discharge pipe and a lower space provided with an oil reservoir for lubricating oil to be supplied to the compression portion below the motor,
A partition plate that partitions the opening side of the discharge pipe and the inside of the middle space is provided in the middle space, and gas discharged from the compression portion and drainage of lubricating oil supplied to the compression portion are provided. A passage through which the electric motor is passed from the inside of the partition plate and led to the lower space, and a passage through which the gas flows from the lower space along the inner wall of the hermetic container to the outside of the compressor. It has a configuration.

  Moreover, it has the structure which uses an insulating material for the said partition plate.

  Further, the partition plate is configured to be fitted by press-fitting into a recess provided in a frame that supports the compression portion.

  According to the present invention, the partition plate is provided in the middle space provided with the discharge pipe formed between the compression unit and the electric motor, and the discharge gas and the oil are guided to the lower part of the electric motor to thereby provide lubrication contained in the discharge gas. The scroll compressor can perform oil separation satisfactorily, prevent the so-called oil rising from which the lubricating oil goes out of the compressor, and can effectively cool the electric motor.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail as examples based on the attached drawings.

    FIG. 1 is a longitudinal sectional view of a scroll compressor according to the present invention, FIG. 2 is an enlarged sectional view of an essential part thereof, FIG. 3 is an upper sectional view of a partition plate according to the present invention, and FIG. FIG. 5B is a detailed view thereof, and FIG. 5 is an explanatory view showing the flow of fluid.

  1 and 2, a compression unit 2 is disposed above the inside of the hermetic container 1, and a stator 3b fixed inside the hermetic container 1 below, and a rotor 3a that is driven and rotated by the stator 3b. And the compression unit 2 is driven by the electric motor 3.

  The compression section 2 forms a plurality of compression chambers 5 by meshing the fixed scroll 4 having a spiral wrap 4b standing on the inner surface of the end plate 4a and the fixed scroll 4 and the wrap 6b on the inner surface of the end plate 6a. The orbiting scroll 7 and the orbiting bearing 7c formed on the rear surface of the orbiting scroll 6 are inserted into an orbiting shaft 7a at the tip, and the rotational force of the electric motor 3 is transmitted to the orbiting scroll 6 and the compression. A shaft 7 provided with a lubricating oil feed path 7d for supplying lubricating oil to each sliding portion of the portion 2, and a main frame 8 that supports a main shaft 7c provided below the pivot shaft 7a of the shaft 7. It is configured.

  An upper space (discharge chamber) 11 above the compression unit 2 in which compressed gas is discharged from a discharge port 4 c provided in the approximate center of the fixed scroll 4 and the electric motor 3 are accommodated in the space in the sealed container 1. A middle space 3c provided with a discharge pipe 10 formed between the compression section 2 and the motor 3 in the motor chamber, and an oil reservoir 14 for lubricating oil to be supplied to the compression section 2 below the motor 3. The lower space 3d is partitioned.

  In addition, in order to guide the gas discharged from the discharge port 4c to the upper part of the electric motor 3, a plurality of discharge gas passages 13 communicating the upper space 11 and the middle space 3c are provided, A plurality of oil return passages 12 are provided in the main frame 8 so as to communicate the back space of the boss portion 6c and the middle space 3c in order to guide surplus oil that has lubricated the sliding portion to the upper portion of the motor 3. The rotor 3a of the electric motor 3 is provided with a gas passage 17 penetrating from the upper part to the lower part of the electric motor 3, and a fluid in which gas and oil in the upper part of the electric motor 3 are mixed is mainly used for the rotor 3a of the electric motor 3. From the gap 19 between the stator 3b and the gas passage 17, it is guided to the lower space 3d below the motor 3.

  A part of the fluid is guided to a lower portion of the electric motor 3 from a gap 20 of a stator winding described later.

  Further, a gas return for guiding the gas separated from the mixed fluid in the lower space 3d to the outside of the sealed container 1 from the discharge pipe 10 between the outer peripheral surface of the stator 3b and the inner wall surface of the sealed container 1 A passage 21 is provided.

  A partition plate 16 for partitioning the opening side of the discharge pipe 10 and the inside of the middle space 3c is provided in the middle space 3c that connects the outer periphery of the main frame 8 and the outermost winding edge of the stator 3b. The gas discharged from the compression unit 2 and the surplus oil of the lubricating oil supplied to the sliding portions of the compression unit 2 are passed through the electric motor 3 from the inside of the partition plate 16 and guided to the lower space 3d. Thus, gas and surplus oil are prevented from leaking directly from the middle space 3c to the discharge pipe 10.

  As shown in FIG. 3, the partition plate 16 and the main frame 8 are attached by providing a concave step portion on the outer peripheral portion of the main frame 8, and partitioning between the inner wall surface of the sealed container 1 and the concave step portion. The upper part of the plate 16 is press-fitted. Thereby, the partition plate 16 is reliably hold | maintained. As for the assembly method, after the rotor 3a is shrink-fitted onto the compression part assembly and the shaft 7, the partition plate 16 is covered and fitted from the shaft 7 side.

  The partition plate 16 is made of an insulating material such as a resin material and is relatively soft, and the partition plate 16 and the stator 3b are fixed as shown in FIGS. 4 (A) and 4 (B). An insulator 18 is disposed on the outer periphery of the winding on the upper surface of the child 3b, and the partition plate 16 is attached in close contact with the inside or outside of the insulator 18. At this time, the vertical length of the insulator 18 is set slightly longer than the length between the compression portion 2 and the stator 3b, so that the lower portion 16a of the partition plate 16 is compressed as shown in FIG. The insulator 18 and the partition plate 16 are more closely attached to prevent the gas and excess oil from leaking to the discharge pipe 10 side.

  Next, the flow of gas and excess oil will be described with reference to FIG. The compressed gas compressed by the compression unit 2 flows from the discharge port 4c through the discharge chamber 11 to the middle space 3c through the discharge gas passage 13. On the other hand, excess oil flows from the oil passage 12 to the middle space 3c. Then, the compressed gas and surplus oil are mixed in the middle space 3c, and flow from the gas passage 17, the gap 19 between the rotor 3a and the stator 3b, and the gap 20 between the stator windings to the lower space 3d. The lubricating oil is separated from the compressed gas and accumulated in an oil reservoir 14 at the bottom of the sealed container 1, and this lubricating oil is sucked up by an oil supply mechanism 15 including an oil pump and supplied to each sliding portion of the compression unit 2. On the other hand, the compressed gas flows from the gas return passage 21 to the outside of the sealed container 1 through the discharge pipe 10.

  When the lubricating oil flows through the gas passage 17, the gap 19 between the rotor 3 a and the stator 3 b and the gap 20 between the stator windings, the motor 3 is primarily cooled, and further when the compressed gas passes through the gas return passage 21. Secondary cooling and effective cooling.

  As described above, the partition plate 16 that partitions the opening side of the discharge pipe 10 and the inside of the middle space 3c is provided in the middle space 3c below the compression portion 2, and the gas discharged from the compression portion 2; The passage of the lubricating oil supplied to the compression section 2 through the electric motor 3 from the inside of the partition plate 16 to the lower space 3d and the gas from the lower space 3d along the inner wall of the sealed container 1 and the discharge pipe 10 By providing the gas return passage 21 that flows more out of the compressor, the lubricating oil contained in the discharged gas is separated well, and the lubricating oil flows out to the refrigeration cycle outside the compressor. Thus, the scroll compressor can prevent the so-called oil rising and can effectively cool the electric motor.

It is a longitudinal cross-sectional view of the scroll compressor by this invention. It is a principal part expanded sectional view by this invention. It is sectional drawing which shows the upper part attachment of the partition plate by this invention. (A) is lower part attachment sectional drawing of the partition plate by this invention.

(B) is a principal part detail drawing of (A).
It is explanatory drawing which shows the flow of the fluid by this invention. It is a principal part expanded sectional view of the scroll compressor by a prior art example.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Airtight container 2 Compression part 3 Electric motor
3a rotor
3b Stator
3c Central space
3d lower space 4 fixed scroll
4c Discharge port 5 Compression chamber 6 Orbiting scroll 7 Shaft
7d Lubricating oil feed path 8 Main frame 9 Suction pipe
10 Discharge pipe
11 Discharge chamber
12 Oil return passage
13 Discharge gas passage
14 Oil sump
15 Oil pump
16 Partition plate
17 Gas passage
18 Insulator
19, 20 Clearance
21 Gas return passage

Claims (5)

A compression unit and an electric motor that drives the compression unit are arranged above and below in the sealed container, and a space in the sealed container is formed between the upper space above the compression unit and between the compression unit and the motor. In a scroll compressor partitioned into a middle space provided with a discharge pipe and a lower space provided with an oil reservoir for lubricating oil supplied to the compression portion below the motor,
A passage for guiding the gas containing the lubricating oil discharged from the compression section and the lubricating oil supplied to the compression section to the lower space; and the gas from the lower space through the discharge pipe to the outside of the compressor A scroll compressor characterized by forming a passage leading to A compression unit and an electric motor that drives the compression unit are arranged above and below in the sealed container, and a space in the sealed container is formed between the upper space above the compression unit and between the compression unit and the motor. In a scroll compressor partitioned into a middle space provided with a discharge pipe and a lower space provided with an oil reservoir for lubricating oil supplied to the compression portion below the motor,
A passage for guiding the gas containing the lubricating oil discharged from the compression section and the lubricating oil supplied to the compression section to the lower space; and the gas from the lower space through the discharge pipe to the outside of the compressor A scroll compressor characterized in that a passage leading to a side is partitioned by a shielding means. A compression unit and an electric motor that drives the compression unit are arranged above and below in the sealed container, and a space in the sealed container is formed between the upper space above the compression unit and between the compression unit and the motor. In a scroll compressor partitioned into a middle space provided with a discharge pipe and a lower space provided with an oil reservoir for lubricating oil supplied to the compression portion below the motor,
A gas containing lubricating oil discharged from the compression section in the middle space, and a lubricating oil that has been supplied to the compression section and then flowed down into the middle space are at least a stator and a rotor of the motor. A passage that passes through the gap and leads to the lower space, and a passage that passes the gas from the lower space through the gap between the inner wall of the hermetic container and the electric motor and guides the gas from the discharge pipe to the outside of the compressor are formed. A scroll compressor comprising a partition plate. The scroll compressor according to claim 3, wherein an insulating material is used for the partition plate. The upper part of the partition plate is attached to a frame that supports the compression portion, and the lower part of the partition plate is in close contact with the inside or outside of the insulator disposed on the outer periphery of the winding on the upper surface of the stator. The scroll compressor according to claim 3.

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