JP4253391B2 - Scroll type compressor - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a scroll compressor.
[0002]
[Prior art]
Scroll type compressors are widely used in refrigeration systems, and include a fixed scroll and a movable scroll paired therewith. The fixed scroll usually includes a fixed spiral wall and a fixed end plate fixed integrally to one end of the fixed scroll wall in the axial direction. The movable scroll usually includes a movable spiral wall and a movable end plate fixed integrally to one end of the movable scroll wall in the axial direction. The fixed end plate and the movable end plate face each other in a state where the fixed spiral wall and the movable spiral wall are engaged with each other, and several compression spaces are formed between them for compressing and transferring a gas such as a refrigerant. Yes.
[0003]
In order to prevent gas from leaking from the compression space during the compression process, in general, a tip seal groove extending along the spiral is provided on each axial end surface of the fixed spiral wall and the movable spiral wall, and the chip seal is disposed here. is doing. During operation of the scroll compressor, the tip seal is pressed against each of the fixed end plate and the movable end plate and the side wall of the tip seal groove by gas pressure, thereby sealing the compression space.
[0004]
There is also a scroll compressor that does not include the above-described tip seal groove and tip seal.
[0005]
By the way, in the refrigeration system, lubricating oil compatible with the circulating refrigerant is indispensable in order to maintain the performance and durability of the compressor. That is, lubricating oil is also enclosed with the refrigerant in the refrigeration circuit, and each sliding portion of the compressor is lubricated by this lubricating oil.
[0006]
[Problems to be solved by the invention]
However, during operation, the lubricating oil flows out of the compressor together with the refrigerant and circulates in the refrigeration circuit, so that it may adhere to the heat exchanger included in the refrigeration circuit and reduce the heat exchange efficiency. This leads to a decrease in the cooling capacity of the refrigeration system, an increase in power consumption, and a decrease in the service life of the equipment.
[0007]
Therefore, an object of the present invention is to provide a scroll compressor in which lubricating oil is circulated inside during operation to suppress outflow to the outside.
[0008]
Another object of the present invention is to provide a scroll compressor capable of improving the heat exchange efficiency of a refrigeration system.
[0009]
Still another object of the present invention is to provide a scroll compressor that ensures the lubrication of each mechanism of the compressor and has improved durability.
[0010]
Still another object of the present invention is to provide a scroll compressor that requires only a small amount of lubricating oil.
[0011]
[Means for Solving the Problems]
According to the present invention, in the scroll type compressor having a vortex Makikabe, wherein the axial end surface of the spiral wall, a groove having a suitable width and a depth to pass the lubricating oil, the spiral of the spiral wall A first communication notch from the inner wall surface to the groove is provided in the central portion, and a second communication notch from the outer wall surface to the groove is provided in the spiral outer periphery portion of the spiral wall, A scroll compressor is obtained in which the existing lubricating oil is returned to the low pressure portion through the groove by utilizing a gas pressure difference.
[0012]
In addition, it has a fixed scroll and the movable scroll which cooperates with this, You may provide the said 1st and 2nd communication notch only in the spiral wall of the said movable scroll.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
A scroll compressor according to a reference example will be described with reference to FIG.
[0014]
The illustrated scroll compressor is suitable for use in a vehicle air conditioner, and includes a fixed scroll 1, a movable scroll 2 paired with the fixed scroll 1, a casing 3 containing these, and an opening of the casing 3. And a front housing 4 which is fixed to the end and closed. The fixed scroll 1 includes a fixed spiral wall 1a and a fixed end plate 1b fixed integrally to one end thereof in the axial direction. The movable scroll 2 includes a movable spiral wall 2a and a movable end plate 2b fixed integrally to one end in the axial direction thereof. The fixed end plate 1b and the movable end plate 2b face each other in a state where the fixed spiral wall 1a and the movable spiral wall 2a are engaged with each other, and several compression spaces for transferring a fluid such as a refrigerant while compressing them between them. 5 is formed.
[0015]
The fixed end plate 1 b is fixed to the casing 3 with bolts or the like (not shown), and a discharge chamber 7 is formed between the fixed end plate 1 b and the casing 3. The fixed end plate 1b is formed with a discharge port 8 for discharging the fluid compressed in the compression space 5 into the discharge chamber 7.
[0016]
Between the movable end plate 2 b and the front housing 4, there is provided a rotation prevention mechanism 9 for preventing rotation of the movable scroll 2 but allowing revolution. Further, an annular protrusion 2c is integrally formed on the surface of the movable end plate 2b opposite to the movable spiral wall 2a. An eccentric bush 11 is rotatably disposed via a drive bearing 12 inside the annular protrusion 2c.
[0017]
A shaft 13 having a large diameter portion 13a passes through the center of the front housing 4. The shaft 13 is supported by a shaft bearing 14, and the large diameter portion 13 a is supported by a main bearing 15. The large-diameter portion 13 a of the shaft 13 includes an eccentric pin 16 engaged with the eccentric bush 11. The shaft 13 is provided with a counterweight 17 that opposes a moment during operation of the movable scroll 2.
[0018]
A rotor 21 is rotatably supported via a radial bearing 19 on the outer side of the cylindrical portion 4a of the front housing 4. The rotor 21 is rotationally driven by, for example, an automobile engine. The rotor 21 is connected to the shaft 13 via the electromagnetic clutch 22. Therefore, the shaft 13 rotates integrally with the rotor 21 when the electromagnetic clutch 22 is on, but the shaft 13 is disconnected from the rotor 21 when the electromagnetic clutch 22 is disconnected.
[0019]
When the shaft 13 rotates, the movable scroll 2 revolves on a circular orbit by the action of the eccentric pin 16 and the eccentric bush 11. At this time, the rotation of the movable scroll 2 is blocked by the rotation blocking mechanism 9. As a result, the compression space 5 is transferred to the center while compressing the fluid, and the fluid is discharged to the discharge chamber 7 through the discharge port 8. The fluid in the discharge chamber 7 flows out from the discharge port (not shown) into the refrigeration circuit, returns to the casing 3 from the inflow port (not shown), and is taken into the compression space 5. Here, the compression space 5 transferred to the center is referred to as a high pressure portion, and a portion having a lower pressure than the high pressure portion is referred to as a low pressure portion.
[0020]
In order to prevent gas from leaking from the compression space 5 during the compression process, a tip seal groove 24 extending along the spiral is provided on each axial end face of the fixed spiral wall 1a and the movable spiral wall 2a. Is arranged. During the operation of the scroll compressor, the tip seal 25 is pressed against each of the fixed end plate 1a and the movable end plate 2a and the side wall of the tip seal groove 24 by the gas pressure, thereby sealing the compression space 5.
[0021]
Further, the description will be continued with reference to FIGS.
[0022]
A first communication notch 27 extending from the inner wall surface 26 to the tip seal groove 24 is provided at the central portion of the spiral of the movable scroll wall 2 a of the movable scroll 2. Further, a second communication notch 29 extending from the outer wall surface 28 to the chip seal groove 24 is provided at the spiral outer peripheral portion of the movable spiral wall 2a. Therefore, the high-pressure part and the low-pressure part described above communicate with each other via the first communication cutout 27, the gap between the tip seal grooves 24, and the second communication cutout 29.
[0023]
During the operation of the scroll compressor, the lubricating oil present together with the refrigerant gas in the high pressure portion flows into the tip seal groove 24 from the first communication cutout 27 due to the gas pressure difference. Since the movable scroll 2 revolves on a circular orbit, centrifugal force acts on the lubricating oil in the tip seal groove 24. Due to this centrifugal force and the above-described gas pressure difference, the lubricating oil flows outward along the tip seal groove 24 and flows out from the second communication notch 29 to the low pressure portion. As a result, since the lubricating oil circulates inside the compressor, the outflow to the refrigeration circuit is suppressed. Therefore, the heat exchange efficiency of the refrigeration system can be improved and the amount of lubricating oil enclosed can be reduced.
[0024]
Referring to FIGS. 4-6, it will be described scroll type compressor according to the shape condition of the present invention. Components similar to those in FIGS. 1 and 2 are denoted by the same reference numerals and description thereof is omitted.
[0025]
The illustrated scroll compressor is of a type that does not include the above-described tip seal groove and tip seal. In this case, the spiral groove 31 extending along the spiral is provided on the axial end surface of the movable spiral wall 2a. It is assumed that the spiral groove 31 has a width and depth appropriate for passing lubricating oil. Furthermore, a first communication notch 32 extending from the inner wall surface 26 to the spiral groove 31 is provided at the spiral center portion of the movable spiral wall 2 a of the movable scroll 2. In addition, a second communication notch 33 extending from the outer wall surface 28 to the spiral groove 31 is provided at the spiral outer peripheral portion of the movable spiral wall 2a. Therefore, the high-pressure part and the low-pressure part described above communicate with each other via the first communication cutout 32, the spiral groove 31, and the second communication cutout 33.
[0026]
During the operation of the scroll compressor, the lubricating oil present together with the refrigerant gas in the high pressure portion flows into the spiral groove 31 from the first communication notch 32 due to the gas pressure difference. Since the movable scroll 2 revolves on a circular track, centrifugal force acts on the lubricating oil in the spiral groove 31. Due to the centrifugal force and the above-described gas pressure difference, the lubricating oil flows outward along the spiral groove 31 and flows out from the second communication notch 33 to the low pressure portion. As a result, since the lubricating oil circulates inside the compressor, the outflow to the refrigeration circuit is suppressed. Therefore, the heat exchange efficiency of the refrigeration system can be improved and the amount of lubricating oil enclosed can be reduced.
[0027]
In addition, you may comprise so that lubricating oil may be returned from a high voltage | pressure part to a low voltage | pressure part through the same groove | channel provided in the fixed spiral wall 1a of the fixed scroll 1. FIG. Further, the position for returning the lubricating oil is not limited to the compression space, but may be the space inside the casing 3 on the outer side.
[0028]
【The invention's effect】
As described above, in the scroll compressor according to the present invention, since the lubricating oil circulates inside the compressor, the outflow to the refrigeration circuit is suppressed. Therefore, the heat exchange efficiency of the refrigeration system can be improved and the amount of lubricating oil enclosed can be reduced.
[0029]
Further, since the lubricating oil is circulated inside the compressor, the lubricating oil is reliably supplied to each mechanism of the compressor, the lubrication is performed well, and the durability is improved. That is, the conventional disadvantage that the oil supply for the lubrication of the compressor is unstable due to the increase or decrease of the oil remaining in the system depending on the operation state is solved.
[Brief description of the drawings]
FIG. 1 is a longitudinal sectional view of a scroll compressor according to a reference example .
FIG. 2 is a front view of a movable scroll included in the scroll compressor of FIG.
FIG. 3 is an enlarged cross-sectional view taken along line III-III in FIG.
Longitudinal sectional view of a scroll-type compressor according to the shape condition of the embodiment of the present invention; FIG.
5 is a front view of a movable scroll included in the scroll compressor of FIG. 4. FIG.
6 is an enlarged cross-sectional view taken along line VI-VI in FIG.
[Explanation of symbols]
1 fixed scroll 1a fixed spiral wall 1b fixed end plate 2 movable scroll 2a movable spiral wall 2b movable end plate 3 casing 4 housing 5 compression space 7 discharge chamber 9 rotation prevention mechanism 11 eccentric bushing 12 drive bearing 13 shaft 21 rotor 22 electromagnetic clutch 24 Tip seal groove 25 Tip seal 26 Inner wall surface 27 First communication notch 28 Outer wall surface 29 Second communication notch 31 Spiral groove 32 First communication notch 33 Second communication notch

Claims (2)

  In the scroll compressor having a spiral wall, a groove having a width and a depth suitable for passing lubricating oil is formed in an axial end surface of the spiral wall, and an inner wall surface is formed at a central portion of the spiral wall. A first communication notch from the outer wall surface to the groove is provided at the outer peripheral portion of the spiral wall, and the lubricating oil existing in the high pressure portion is gas pressure difference. A scroll compressor characterized in that the compressor is returned to the low-pressure part through the groove. Fixed scroll and a movable scroll cooperating with this, a scroll type compressor according to claim 1, wherein the only provided-out the first and second communicating notch the spiral wall of the movable scroll.

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