JPH02227585A - Scroll compressor - Google Patents

Abstract

PURPOSE:To simplify an oil supplying mechanism by immersing a compression mechanism and a supporting frame in lubricant in an oil sump situated in the lower part of enclosure case, and providing this supporting frame with a suction hole to suck in the lubricant in oil sump to a bearing part. CONSTITUTION:In a scroll type compressor, the scroll type compression mechanism 3 is driven by a motor arranged in the upper part of an enclosure case 1 through a rotary shaft 13, which is borne by a bearing part 12 formed in a single piece with a supporting frame 8 of this compression mechanism 3. These compression mechanism 3 and supporting frame 8 are immersed in lubricant in an oil sump 24 situated in the lower part of the enclosure case 1. A horizontal lubricant suction hole 25 to suck in the lubricant in sump 24 to the bearing part 12 of the supporting frame 8, and an oil supply groove 26 for the lubricant sucked from the suction hole 25 is provided between the sliding surfaces of this bearing part 12 and the main part 14 of rotary shaft 13.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Application Field) This invention has a scroll type compression mechanism section at the bottom of a sealed case, and a drive motor at the top of this scroll type compression mechanism section. Related to scroll compressors.

(Prior art) Generally, as a scroll compressor, for example,
Japanese Patent No. 134890 discloses a structure in which a drive motor is disposed above the closed case, and a scroll compression mechanism is disposed below the drive motor. In this case, the scroll compression mechanism is disposed above the oil reservoir formed at the inner bottom of the sealed case. Further, an oil pump is disposed at the shaft end of the orbiting scroll of the scroll type compression mechanism. Furthermore, this scroll type compression mechanism has oil supply holes formed in the orbiting scroll and the fixed scroll, respectively.
An oil suction pipe is connected to the oil supply hole of the fixed scroll. The oil suction port of this oil suction pipe is arranged in an oil reservoir at the inner bottom of the sealed case. When the scroll compressor is driven, as the oil pump is driven, the lubricating oil in the oil reservoir at the inner bottom of the sealed case is sequentially passed through the oil suction pipe, the oil supply hole in the fixed scroll, and the oil supply hole in the orbiting scroll. The suction is taken in through the suction port of the pump and supplied to each sliding surface such as the bearing between the shaft end of the orbiting scroll and the drive shaft, the bearing between the drive shaft and the frame, etc.

However, in the conventional structure described above, it is necessary to form oil supply holes in the orbiting scroll and the fixed scroll of the scroll compression mechanism, which makes manufacturing the orbiting scroll and the fixed scroll complicated. There was a □.

Furthermore, during the operation of the scroll compression mechanism, a configuration is required to maintain constant communication between the oil supply hole of the orbiting scroll and the oil supply hole of the fixed scroll, making the configuration of the oil supply mechanism complex and costly. Along with the high cost, there were also problems with reliability.

(Problems to be Solved by the Invention) In the conventional structure, there is a problem that manufacturing the scroll type compression mechanism is troublesome, and the structure of the oil supply mechanism is complicated, resulting in lower cost and reliability. There was a problem with the surface.

This invention was made in view of the above circumstances, and it is possible to simplify the manufacture of the scroll type compression mechanism, and also to simplify the configuration of the oil supply mechanism, thereby reducing costs and improving reliability. It is an object of the present invention to provide a scroll compressor that can achieve the following objectives.

[Structure of the Invention] (Means for Solving the Problems) The present invention immerses a scroll compression mechanism and a support frame in lubricating oil in an oil reservoir formed at the bottom of a sealed case, and A lubricating oil suction hole is formed in the oil reservoir to suck the lubricating oil in the oil reservoir, and a lubricating oil supply groove for sucking the lubricating oil from the lubricating oil suction hole is provided between the sliding surfaces of the bearing and the rotating shaft.

(Function) When the scroll compression mechanism operates, the lubricating oil in the oil reservoir at the bottom of the sealed case is sucked into the inner side of the bearing through the lubricating oil suction hole in the bearing of the support frame, and the sucked lubricating oil is transferred to the bearing. By guiding the oil to each sliding surface through the oil groove between the sliding surface and the rotating shaft, the oil supply hole of each scroll member of the scroll compression mechanism can be omitted, making it easier to manufacture the scroll compression mechanism. At the same time, the configuration of the oil supply mechanism is simplified to reduce costs and improve reliability.

(Example) An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows the main part structure of the scroll compressor shown in the second factor. 1 is a closed case, and 2 is a main body of the scroll compressor housed in the closed case 1. FIG. The scroll compressor main body 2 is provided with a scroll compression mechanism 3 disposed at the bottom of the closed case 1 and a drive motor 4 disposed at the top of the scroll compression mechanism 3. Furthermore, the scroll type compression mechanism section 3
A fixed scroll 5 and an orbiting scroll 6 are provided. The fixed scroll 5 and the orbiting scroll 6 are each provided with substantially disc-shaped end plates 5a and 6a, and each end plate 5a.

Wraps 5b and 6b each having a spiral shape such as an involute are provided protruding from 6a. The wrap 5b of the fixed scroll 5 and the wrap 6b of the orbiting scroll 6 are engaged with each other, and a crescent-shaped compression chamber 7 is formed between the wraps 5b and 6b.

Further, 8 is a support frame of the scroll type compression mechanism section 3. This support frame 8 is fixed by fixing bolts 10 to a fixing plate 9 which is fixed to the inner wall surface of the sealed case 1 by means such as press-fitting or burning out. Further, the fixed scroll 5 is attached to the fixed port 11 on this support frame 8.
Fixed by Further, a bearing portion 12 is integrally formed in the center of the support frame 8. A main shaft portion 14 of a rotating shaft 13 of the drive motor 4 is supported by the bearing portion 12 . Further, a crank pin portion 15 is formed at the lower end portion of this main shaft portion 14 . An engagement hole 17 for a boss portion 16 projecting from the center of the upper surface of the end plate 6a of the orbiting scroll 6 is formed in the crank bin portion 15. In this case, the engagement hole 17 of the crank bin part 15
The axial center position of the main shaft portion 14 is offset from the axial center position of the main shaft portion 14 by a certain distance in the horizontal direction.

Further, a ring-shaped thrust receiver 18 is disposed on the upper surface of the end plate 6a of the orbiting scroll 6, and an Oldham ring 19 for preventing rotation of the orbiting scroll 6 is disposed on the outer periphery of the thrust receiver 18. ing.

Furthermore, the rotor 20 of the drive motor 4 is fixed to the upper end of the rotating shaft 13 by means such as press fitting or shrink fitting. The stator 21 of the drive motor 4 is fixed to the inner wall surface of the sealed case 1 by means such as press fitting or shrink fitting.

Further, a balance weight 22 is fixed to the outer peripheral surface of the crank bin portion 15 of the rotating shaft 13 by means such as press fitting or shrink fitting. Furthermore, a ring-shaped balance weight storage chamber 23 is formed in the support frame 8 to accommodate this balance weight 22.

On the other hand, an oil reservoir 24 is formed in the lower part of the sealed case 1 to store lubricating oil. The scroll compression mechanism 3 and the support frame 8 are immersed in the lubricating oil in the oil reservoir 24. Further, the bearing portion 12 of the support frame 8 is formed with a horizontal lubricating oil suction hole 25 for sucking the lubricating oil in the reservoir portion 24 . In this case, the lubricating oil suction hole 25 is located at the lower end of the bearing portion 12 . Furthermore, the oil level L of the lubricating oil in the oil reservoir 24 is set to be maintained at a position slightly above the vertical center position of the bearing 12, and the position of the lubricating oil suction hole 25 is maintained under any conditions. Cycle matched to maintain a higher level.

Further, between the sliding surfaces of the bearing portion 12 and the main shaft portion 14 of the rotating shaft 13, an oil supply groove 26 for lubricating oil sucked from the lubricating oil suction hole 25 is formed. This oil supply groove 26 is located in the bearing portion 1.
an annular groove 27 formed on the inner circumferential surface of the bearing section 2 in communication with the lubricating oil suction hole 25;
The first . Second. 28, 29, and 30. In this case, 1. The second oil grooves 28 and 29 are formed, for example, in the inner peripheral surface of the bearing portion 12, and the oil groove 30 of jfi3 is formed in the outer peripheral surface of the main shaft portion 14 of the rotating shaft 13, respectively. Furthermore, the first. One end of each of the second oil grooves 28, 29 is communicated with the annular groove 27, and the other end of the first oil groove 28 extends to the upper end of the bearing part 12, and the second oil groove 28, 29 is connected to the annular groove 27. 29
The other end portion extends to the lower end portion of the bearing portion 12 . The first oil groove 28 is formed by an upward spiral groove that guides the lubricating oil in the annular groove 27 of the bearing part 12 above the bearing part 12 by the centrifugal force that acts when the rotating shaft 13 rotates. Further, the second oil groove 29 is formed by a downward spiral groove cut in the opposite direction to the first oil groove 28, and the annular groove of the bearing portion 12 is formed by the centrifugal force acting when the rotating shaft 13 rotates. The lubricating oil in 27 is guided below the bearing part 12. Further, the third oil groove 30 is connected to the rotating shaft 1.
It is formed by an upward spiral groove that guides the lubricating oil at the lower end of the bearing part 12 to the upper side of the bearing part 12 by the centrifugal force that acts when the bearing part 3 rotates.

Further, a triangular oil groove 31 having a substantially triangular cross-sectional shape is formed in an annular shape on the inner circumferential surface of the lower end portion of the bearing portion 12 . This triangular oil groove 31 communicates with the lower end of the second oil groove 29 . Furthermore, an oil introduction hole 32 whose upper end communicates with a triangular oil groove 31 is formed in the crank bottle portion 15 of the rotating shaft 13 . The lower end of this oil introduction hole 32 communicates with the engagement hole 17 of the crank bottle portion 15. In this case, a ring-shaped gasket 33 is provided at the center between the joint surface of the inner bottom of the engagement hole 17 of the crank bin portion 15 and the end surface of the boss portion 16 of the orbiting scroll 6 to partition the oil supply passage and the gas passage described later. It is fitted.

A gasket 3 is provided between the inner bottom of the engagement hole 17 of the crank bin portion 15 and the end surface of the boss portion 16 of the orbiting scroll 6.
An oil reservoir chamber 34 is formed on the outside of 3. Further, a spiral fourth oil groove 35 is formed on the inner circumferential surface of the engagement hole 17 of the crank bottle portion 15, and the lubricating oil in the oil reservoir chamber 34 flows into this fourth oil groove 35. After being guided to the lower end side of the engagement hole 17 along the line, it is introduced into the balance weight storage chamber 23. Furthermore, an oil hole 36 is formed in the peripheral wall surface of the balance weight storage chamber 23 to return lubricating oil in the balance weight storage chamber 23 into the oil reservoir 24 .

In addition, a suction pipe 3 is provided on the inner peripheral surface of the lower end of the sealed case 1.
7. Discharge pipes 38 are connected to the upper end of the sealed case 1, respectively, as shown in FIG. in this case,
The tip of the suction vibrator 37 is connected to a suction port 39 formed on the outer peripheral surface of the wrap 5b of the fixed scroll 5. Further, a compressed gas discharge hole 40 is formed in the boss portion 16 of the center shaft of the orbiting scroll 6 . This discharge hole 40
A gas passage 41 is formed at the axial center of the rotating shaft 13 via a gas passage inside the packing 33 between the inner bottom of the engagement hole 17 of the crank bottle part 15 and the end face of the boss part 16 of the orbiting scroll 6. is communicated with. When the scroll compression mechanism section 3 is in operation, the suction gas introduced into the compression chamber 7 of the scroll compression mechanism section 3 from the suction pipe 37 through the suction port 39 of the fixed scroll 5 is compressed in the compression chamber 7. After that, the gas is introduced into the upper chamber 42 above the drive motor 4 from the discharge hole 40 of the boss portion 16 of the center shaft of the orbiting scroll 6 through the gas passage 41 in the axial center portion of the rotating shaft 13, and is introduced into the upper chamber 42 above the drive motor 4. The liquid is discharged from the discharge vibrator 38 to the outside.

Next, the operation of the above configuration will be explained.

First, when the scroll compression mechanism section 3 operates, the rotating shaft 1
3 rotates, the orbiting scroll 6 rotates eccentrically.

As the orbiting scroll 6 eccentrically rotates, the suction gas introduced from the suction vibe 37 into the compression chamber 7 of the scroll compression mechanism section 3 is compressed in the compression chamber 7, and then the suction gas is compressed in the compression chamber 7. Discharge hole 4 of section 16
Discharged from 0. Furthermore, this discharged gas is
The gas is introduced into the pressure chamber 42 at the upper part of the drive motor 4 through the gas passage 41 at the axial center of the cylinder, and is discharged to the outside from the discharge vibrator 38 at the upper end of the sealed case 1 .

Also, when the rotating shaft 13 rotates, the annular groove 27 of the bearing portion 12
The lubricating oil inside the first oil groove 28 and the second oil groove 28 is caused by centrifugal force.
- The oil is introduced into the oil groove 29 of the bearing part 12 and guided above the bearing part 12 along the first oil groove 28 between the sliding surfaces of the bearing part 12 and the rotating shaft 13, and at the same time is introduced into the second oil groove 29. It is guided below the bearing part 12 along. Therefore, as the rotating shaft 13 rotates, the lubricating oil sucked into the annular groove 27 from the lubricating oil suction hole 25 of the bearing 12 is transferred to the bearing 12 and the rotating shaft 13.
It is possible to supply oil between the sliding surfaces. And the first
The lubricating oil guided above the bearing part 12 along the oil groove 28 is returned into the oil reservoir part 24.

Further, a part of the lubricating oil guided below the bearing section 12 along the second oil groove 29 is subsequently guided above the bearing section 12 along the third oil groove 30, and then is sent to the oil sump. It is returned to the section 24. Furthermore, the remainder of the lubricating oil introduced to the lower end of the bearing section 12 is introduced into the triangular oil groove 31 on the inner peripheral surface of the lower end of the bearing section 12, and then passes through the oil introduction hole 32 of the crank bottle section 15. The oil is guided into the engagement hole 17 of the crank bottle portion 15 and introduced into the oil sump chamber 34 outside the gasket 33. The lubricating oil in this oil reservoir chamber 34 is transferred to the crank bottle portion 15.
between the sliding surface of the engagement hole 17 and the boss portion 16 of the orbiting scroll 6 along the fourth oil groove 35 on the inner peripheral surface of the engagement hole 17 of the crank bottle portion 15 to the lower end side of the engagement hole 17 After being guided into the balance weight storage chamber 23. Therefore, the lubricating oil flowing along the fourth oil groove 35 on the inner peripheral surface of the engagement hole 17 of the crank bottle part 15 causes the crank bottle part to
The sliding surface between the engagement hole 17 of No. 5 and the boss portion 16 of the orbiting scroll 6 can be lubricated.

Further, the lubricating oil introduced into the balance weight storage chamber 23 is returned into the oil reservoir 24 through the oil hole 36.

Therefore, in the above structure, when the scroll type compression mechanism section 3 is operated, the oil reservoir section 24 at the bottom of the sealed case 1 is
The lubricating oil inside is sucked into the inner side of the bearing part 12 from the lubricating oil suction hole 25 of the bearing part 12 of the support frame 8, and the sucked lubricating oil is sucked into the oil supply groove between the sliding surfaces of the bearing part 12 and the rotating shaft 14. 26 to each sliding surface, it is possible to omit the oil supply holes formed in each scroll member (fixed scroll 5 and orbiting scroll 6) of the conventional scroll type compression mechanism section 3. The scroll type compression mechanism section 3 can be manufactured easily.

Furthermore, since the configuration of the oil supply mechanism of the scroll type compression mechanism section 3 can be simplified compared to the conventional one, it is possible to reduce costs and improve reliability, and also to reduce the size and weight of the entire compressor. Can be done. Further, since the scroll compression mechanism 3 and the support frame 8 are immersed in the lubricating oil in the oil reservoir 24 in the sealed case 1, the operating noise of the scroll compression mechanism 3 can be significantly reduced.

Note that this invention is not limited to the above embodiments. For example, in the above embodiment, the present invention is applied to a scroll compressor equipped with a scroll compression mechanism section 3 formed by a fixed scroll 5 and an orbiting scroll 6, but the scroll compression mechanism section 3 is The present invention may be applied to a scroll compressor having a configuration in which a pair of scroll members are respectively rotated. Furthermore, it goes without saying that various other modifications can be made without departing from the gist of the invention.

[Effects of the Invention] According to the present invention, the scroll compression mechanism and the support frame are immersed in the lubricating oil in the oil sump formed at the lower part of the sealed case, and the lubricating oil in the oil sump is immersed in the bearing of the support frame. In addition to forming a lubricating oil suction hole to suck in the lubricating oil, a groove for lubricating oil sucked from the lubricating oil suction hole is also provided between the sliding surfaces of the bearing and the rotating shaft, making it easy to manufacture the scroll type compression mechanism. In addition, the structure of the oil supply mechanism can be simplified, and costs can be reduced and reliability improved.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIG. 1 is a vertical cross-sectional view of the main parts, and FIG. 2 is a vertical cross-sectional view showing a schematic configuration of the entire scroll compressor. DESCRIPTION OF SYMBOLS 1... Airtight case, 3... Scroll type compression mechanism part, 4... Drive motor, 8... Support frame, 12...
...Bearing part, 13...Rotating shaft, 24...Oil sump part,
25... Lubricating oil suction hole, 26... Oil supply groove. Applicant's agent Patent attorney Takehiko Suzue No. 2rlA

Claims (1)

[Claims] A scroll compression mechanism is disposed at the bottom of the sealed case, and a drive motor is disposed at the top of the scroll compression mechanism. In a scroll compressor integrally formed with a support frame, the scroll compression mechanism and the support frame are immersed in lubricating oil in an oil reservoir formed at the bottom of the sealed case, and the bearings of the support frame are immersed. A lubricating oil suction hole for sucking the lubricating oil in the oil reservoir is formed in the part, and a lubricating oil groove for sucking the lubricating oil sucked from the lubricating oil suction hole is provided between the sliding surfaces of the bearing part and the rotating shaft. A scroll compressor characterized by: