JPH06317267A - Scroll compressor - Google Patents

Abstract

PURPOSE:To provide a scroll compressor by which a thrust surface of a swinging scroll can be lubricated in an inexpensive structure. CONSTITUTION:A motor-driven element having a rotary shaft 5, a frame 4 to support the rotary shaft 5 pivotally in the center, a swinging scroll 8 which is supported movably slidingly with the frame 4 and is driven by the rotary shaft 5 and in which a spiral lap 15 is erected on an end plate 14 and a fixed scroll 7 in which a spiral lap 13 is erected on an end plate 11 meshing oppositely with the swinging scroll 8, are housed in a sealed container. The swinging scroll 8 is turned while revolving to the fixed scroll 7. An oil groove 27 formed extendedly in the radial direction is arranged on a surface on the side of the swinging scroll 8 of the frame 4. Lubricating oil is supplied to the oil groove 27 from the rotary shaft 5.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a scroll compressor used in refrigeration / air-conditioning equipment and the like, which performs compression by engaging a fixed scroll and an orbiting scroll.

[0002]

2. Description of the Related Art Conventional scroll compressors of this type are disclosed, for example, in Japanese Patent Application Laid-Open No. 3-246388 (F04C18 / 02).
As shown in Fig. 4, an electric element having a rotary shaft in a closed container, an orbiting scroll driven by the electric element and having a spiral wrap standing on the end plate, and facing the orbiting scroll. A fixed scroll in which a spiral wrap is erected on an interlocking end plate is housed, and the orbiting scroll is orbited while revolving so as not to rotate with respect to the fixed scroll, thereby forming the fixed scroll and the orbiting scroll. The plurality of compression spaces are gradually compressed from the outside to the inside to perform compression.

Further, since the orbiting scroll slides on the frame while drawing a circular orbit, lubricating oil is constantly supplied between the orbiting scroll and the frame so that the orbiting scroll or the frame is not worn. Need to do so. Therefore, in the above publication, the thrust bearing is sandwiched between the frame and the end plate of the orbiting scroll, and the thrust bearing receives the load in the thrust direction of the orbiting scroll. It was lubricated by forming an oil groove.

However, according to this structure, the addition of the thrust bearing increases the number of parts, complicates the internal structure of the closed container, deteriorates the assembling workability, and raises the cost. For this reason, in the structure without the thrust bearing, conventionally, lubrication between the end plate and the frame of the orbiting scroll is performed by the configuration as shown in FIG. 11 or 12, for example.

That is, in FIG. 11, reference numeral 100 denotes a rotary shaft of an electric element (not shown) housed in a closed container (not shown), and the rotary shaft 100 is pivotally supported by a frame 101 at a central portion. Reference numeral 102 denotes a scroll compression element housed in the closed container, which is a fixed scroll 1
03 and the orbiting scroll 104. The fixed scroll 103 is composed of a disk-shaped end plate 107 that divides the inside of the closed container into a high pressure chamber 105 and a low pressure chamber 106, and an involute shape that is erected on one surface of the end plate 107 or a curve that approximates this. Spiral wrap 108
And is provided with the protruding direction of the wrap 108 facing downward.

The orbiting scroll 104 is a disk-shaped end plate 11.
0, a spiral wrap 111 formed on one surface of the end plate 110 and formed of an involute shape or a curve similar thereto, and a pin portion 112 protruding from the center of the other surface of the end plate 110. It is configured. Then, the orbiting scroll 108 has the surface of the end plate 110 on the side without the wrap 108 (hereinafter referred to as a thrust surface) facing down, and the frame 1
01 is slidably supported on the upper surface of the fixed scroll 103.
Of the crescent-shaped compression spaces 11 inside the wraps 108, which are arranged so as to face each other and engage with each other.
3 is formed.

Reference numeral 114 denotes a drive portion provided at the tip of the rotary shaft 100 and inserted into the pin portion 112 of the orbiting scroll 104. The center of the drive portion 114 is provided eccentrically with the axis of the rotary shaft 100. There is. Further, 115 is an Oldham ring for revolving on a circular orbit so that the orbiting scroll 104 does not rotate with respect to the fixed scroll 103. A discharge port 116 is provided at the center of the end plate 107 of the fixed scroll 103. When the electric element rotates and the orbiting scroll 104 is driven by the drive unit 114, the orbiting scroll 104 is fixed.
It turns while revolving against. Thereby, the compression space 113 is gradually reduced from the outside to the inside,
The suctioned refrigerant is compressed and discharged to the central discharge port 116.
Discharge from.

An oil supply hole 118 is formed vertically inside the rotary shaft 100, and the lubricating oil stored at the lower end of the closed container is pumped up by an oil pump (not shown) at the lower end of the rotary shaft 100 and passes through the oil supply hole 118. And is blown out radially from the upper end of the rotating shaft 100. On the other hand, in the end plate 110 of the orbiting scroll 104, one end is the rotating shaft 100.
Is provided with an oil supply passage 119 that communicates with the upper end of the oil supply passage and the other end communicates with the thrust surface of the end plate 110.
The lubricating oil is supplied to the sliding surface by means of 19 to prevent the abrasion of the thrust surface of the end plate 110.

Further, in the structure shown in FIG. 12, one end has an oil supply hole 11
8, an oil supply passage 120, which communicates with the sliding surface of the frame 101 at the other end, is bored in the frame 101, and the lubricating oil is supplied to the sliding surface through the oil supply passage 120 so that the end plate 110 It prevented abrasion of the thrust surface.

[0010]

However, in such a lubricating structure, the end plate 110 of the orbiting scroll 104, or the minute and bent oil supply passage 119 in the frame 101,
Alternatively, 120 has to be bored, and precise processing is required, which causes a problem of high manufacturing cost.

The present invention has been made to solve the above-mentioned problems of the prior art, and an object thereof is to provide a scroll compressor which can lubricate the thrust surface of an orbiting scroll with an inexpensive structure. And

[0012]

A scroll compressor SC of the present invention is an electric element 3 having a rotary shaft 5 in a closed container 1.
And a frame 4 which rotatably supports the rotating shaft 5 at the center, and an orbiting scroll 8 which is slidably supported by the frame 4 and driven by the rotating shaft 5 and on which a spiral wrap 15 is erected on the end plate 14. And a fixed scroll 7 in which a spiral wrap 13 is erected on an end plate 11 which faces and engages with the orbiting scroll 8, and the fixed scroll 7
And a plurality of compression spaces 17 formed by the orbiting scroll 8
The orbiting scroll 8 is orbited while revolving with respect to the fixed scroll 7 so as to perform compression by gradually reducing from the outside to the inside. An oil groove 27 extending in the radial direction and an oil supply passage for supplying lubricating oil from the rotating shaft 5 to the oil groove 27 are provided.

[0013]

According to the scroll compressor SC of the present invention, the oil groove 27 extending in the radial direction is formed on the surface of the frame 4 slidably supporting the orbiting scroll 8 on the orbiting scroll 8 side. Since the lubricating oil is supplied to the oil groove 27 from the rotary shaft 5 through the oil supply passage, a simple oil supply passage is not required to be formed in the orbiting scroll 8 or the frame 4 unlike the conventional case. With the structure, the lubricating oil can be supplied between the frame 4 and the end plate 14 of the orbiting scroll 8. Therefore, the thrust surface 14A of the orbiting scroll 8 can be lubricated with an inexpensive structure.

[0014]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a closed container 1 of a scroll compressor SC of the present invention.
2 is a vertical side view of the scroll compressor SC of the present invention, FIG. 3 is a vertical side view of the orbiting scroll 8, FIG. 4 is a bottom view of the orbiting scroll 8, and FIG. 5 is a frame 4 And FIG. 6 are plan views of the orbiting scroll 8.

In FIG. 2, reference numeral 1 designates a closed container in which a scroll compression element 2 is housed on the upper side and an electric element 3 for driving the scroll compression element 2 is housed on the lower side. Reference numeral 4 denotes a frame, and the frame 4 pivotally supports a rotating shaft 5 of the electric element 3 at a central portion.

The scroll compression element 2 is composed of a fixed scroll 7 and an orbiting scroll 8. The fixed scroll 7 includes a disk-shaped end plate 11 that divides the closed container 1 into a high-pressure chamber 9 and a low-pressure chamber 10, an annular wall 12 projecting from one end of the end face of the end plate 11, and the annular wall 12. It is composed of an involute shape or a spiral wrap 13 formed of a curve similar to this, which is surrounded and erected on the end plate 11. The fixed scroll 7 is provided with the annular wall 12 and the wrap 13 protruding downward.

The orbiting scroll 8 has a disk-shaped end plate 14,
A spiral wrap 1 which is formed on one surface of the end plate 14 and which is formed of an involute shape or a curve similar thereto.
5 and the pin portion 1 protruding from the center of the other surface of the end plate 14.
6 and 6. The orbiting scroll 8 is slidably supported by the lower surface of the end plate 14 (hereinafter referred to as thrust surface 14A) on the upper surface of the frame 4 (hereinafter referred to as thrust surface 4A) with the protruding direction of the wrap 15 facing upward. The wrap 15 faces and engages with the wrap 13 of the fixed scroll 7 to form a plurality of crescent-shaped compression spaces 17 therein. Further, the compression space 17 is configured to be gradually reduced from the outside to the inside to compress the sucked refrigerant, as will be described later in detail.

Reference numeral 19 denotes a drive portion provided at the tip of the rotary shaft 5 and inserted into the pin portion 16 of the orbiting scroll 8. The center of the drive portion 19 is provided eccentrically with the axis of the rotary shaft 5. There is. Also, 20 is an Oldham ring, which is provided between the frame 4 and the orbiting scroll 8. The Oldham ring 20 functions to revolve the orbiting scroll 8 on a circular orbit so as not to rotate with respect to the fixed scroll 7.

On the other hand, a discharge port 18 which connects the compression space 17 and the high pressure chamber 9 is provided in the central portion of the end plate 11 of the fixed scroll 7, and a refrigerant is supplied to the scroll compression element 2 on the outer peripheral portion of the frame 4. A suction passage 21 for leading is provided. Further, 22 is a suction pipe attached to the closed container 1, and the suction pipe 22 communicates with the low pressure chamber 10 in the closed container 1 below the frame 4. Reference numeral 23 denotes a discharge pipe attached to the upper portion of the closed container 1, and the discharge pipe 23 communicates with the high pressure chamber 9 in the closed container 1.

An upper and lower oil supply passage 24 forming an oil supply passage is formed in the rotary shaft 5. The oil supply passage 2
The lower end of 4 communicates with an oil pump (not shown) provided at the lower end of the rotary shaft 5, and the upper end is open at the upper end of the drive unit 19. On the other hand, lubricating oil is stored in the lower end of the closed container 1, and the oil pump pumps up the lubricating oil and supplies it to the oil supply passage 24. Then, the lubricating oil that has risen in the oil supply passage 24 is blown out radially from the upper end of the drive unit 19.

A plurality of oil supply holes 26, which radially extend in the radial direction and constitute the oil supply passage, are formed in the base of the upper end of the pin portion 16 of the orbiting scroll 8, and the pin portion 16 is provided.
It communicates inside and outside. The inner end opening of the oil supply hole 26 communicates with the oil supply passage 24 at the upper end of the drive portion 19. On the other hand, on the thrust surface 4A of the frame 4, two oil grooves 27 extending in the radial direction are formed at opposite positions. The inner end 27A of the oil groove 27 is chamfered obliquely, and the outer end of the oil groove 27 is near the suction positions P, P of the wrap 15 of the orbiting scroll 8 and the wrap 13 of the fixed scroll 7, and the frame 4 and the Oldham ring 20. There is an opening in the space A between and. This space A is Oldham ring 20
And the orbiting scroll 8 are open in the gap. Also,
Due to the revolving movement of the orbiting scroll 8, the outer end opening of the oil supply hole 12 is configured to face the inner end 27A of the oil groove 27 at a position closest to each other with an interval of 0.5 mm to 1.5 mm.

Next, the operation of the scroll compressor SC of the present invention will be described with reference to FIGS. Electric element 3
When is driven, the orbiting scroll 8 is driven via the rotary shaft 5. That is, the orbiting scroll 8 has the pin portion 1
6 is driven by a drive unit 19 (which is eccentric with respect to the axis of the rotary shaft 5) and is rotated by the Oldham ring 20 while revolving on a circular orbit so as not to rotate with respect to the fixed scroll 7. . Here, FIGS. 7 and 8 show a state in which the orbiting scroll 8 is shifted to the left side, and FIG.
FIG. 10 shows a state in which the frame 4 is shifted to the right side (note that the frame 4 is seen through from below in FIGS. 8 and 10).

Due to the motion of the orbiting scroll 8, the fixed scroll 7 and the orbiting scroll 8 have their wraps 1.
The compression space 17 formed between 3 and 15 is gradually reduced from the outside to the inside. On the other hand, the refrigerant flowing from the suction pipe 22 into the low pressure chamber 10 in the closed container 1 is guided to the compression space 17 of the scroll compression element 2 from the suction positions P, P through the suction passages 21 ... ,
The refrigerant is gradually compressed from the outside to the inside by the orbiting of the orbiting scroll 8. This compressed refrigerant gas is discharged from the discharge port 18 at the center of the end plate 11 to the high pressure chamber 9 and discharged from the discharge pipe 23 to the outside of the closed container 1.

On the other hand, the lubricating oil stored at the lower end of the closed container 1 is pumped up by the oil pump at the lower end of the rotary shaft 5, and passes through the oil supply passage 24 as shown by the broken line arrow in the figure to drive the rotary shaft 5 drive unit 19. It is blown out in the radial direction from the upper end (a part of the lubricating oil is also discharged toward the pin portion 16 from the middle portion of the drive portion 19). The lubricating oil blown out from the oil supply passage 24 flows into the oil supply hole 26 in the orbiting scroll 8, passes through the oil supply hole 26, and is discharged in the radial direction from the outer end opening, so that the oil groove 2
It sprinkles on the inner end 27A of 7 and enters into the oil groove 27 from there.

Here, since the oil supply hole 26 can be formed by simply piercing the pin portion 16 of the orbiting scroll 8 from the side,
The processing is simple and the manufacturing cost can be reduced. Further, the positional relationship between the oil groove 27 and the oil supply hole 26 is set as described above (0.5 mm to 1.5 mm at the closest position), so that viscous lubricating oil can be reliably transferred to the oil groove 27. It can be reached and the inner end 2 of the oil groove 27
Since 7A has a chamfered shape as described above, the opening area thereof is enlarged, so that the lubricating oil discharged from the oil supply hole 26 is more likely to enter the oil groove 27.

In particular, since the oil groove 27 can be formed only by cutting the thrust surface 4A of the frame 4, the processing is simple as described above, and the manufacturing cost can be reduced.
The lubricating oil flowing into the oil groove 27 is supplied between the frame 4 and the end plate 14 of the orbiting scroll 8 to sufficiently lubricate the thrust surface 14A of the orbiting scroll 8. Therefore, the thrust surface 14A has a simple structure. Wear can be reliably prevented.

The lubricating oil that has passed through the oil groove 27 is discharged into the space A through the outer end opening thereof. Here, when the orbiting scroll 8 is shifted to the left as shown in FIG. 7, the oil supply hole 26 on the left side of the orbiting scroll 8 is close to the oil groove 27 of the frame 4, so that the lubricating oil reaches from the oil supply hole 26. It becomes easier and the Oldham ring 20 and the frame 4 are separated from each other.
On the contrary, the oil supply hole 26 on the right side is separated from the oil groove 27, and the Oldham ring 20 and the frame 4 are close to each other. Therefore, the space A on the left side of the frame 4 is expanded and the space A on the right side is contracted. This relationship is reversed in the left and right spaces A when the orbiting scroll 8 is moved to the right as shown in FIGS. 9 and 10.

Here, when the space A is expanded, the volume change thereof causes the lubricating oil to be drawn from the oil groove 27 into the space A as indicated by the broken line arrow in FIGS. It is sucked into the space A through the gap with the Oldham ring 20 as indicated by the solid arrow. Then, the lubricating oil and the refrigerant gas are mixed in this space A, and when the space A is contracted, it is discharged from the gap between the orbiting scroll 8 and the Oldham ring 20 as indicated by the solid line arrow in the figure due to the volume change. , Becomes a mist and is scattered.

At this time, since the outer end of the oil groove 27 opens near the suction positions P, P of the wrap 15 of the orbiting scroll 8 and the lap 13 of the fixed scroll 7, the lubrication scattered from the space A The oil is smoothly sucked into the compression space 17. The lubricating oil sucked into the compression space 17 causes contact between the end plate 11 and the wrap 15, and the end plate 14 and the wrap 13
Since the contact portion of the above and the contact portion of the laps 13 and 15 are sealed and each sliding portion is lubricated, highly efficient operation with less leakage loss can be realized. Here, the amount of lubricating oil necessary and sufficient for the lubrication of the seals and sliding parts of each contact part can be easily adjusted to an appropriate amount by the number of oil grooves 27 and the cross-sectional area.

[0030]

As described above in detail, according to the present invention, an oil groove extending in the radial direction is formed on the surface of the frame for slidably supporting the orbiting scroll on the orbiting scroll side. Since the lubricating oil is supplied from the rotating shaft to the oil supply passage, the structure of the frame and the oscillating scroll can be simplified with a simple structure without the need to pierce the swinging scroll or the fine oil supply passage in the frame as in the conventional case. Lubricating oil can be supplied between the end plates. Therefore, the thrust surface of the orbiting scroll can be reliably lubricated with an inexpensive structure.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional side view of an upper portion inside a closed container of a scroll compressor according to the present invention.

FIG. 2 is a vertical cross-sectional side view of the scroll compressor of the present invention.

FIG. 3 is a vertical sectional side view of an orbiting scroll.

FIG. 4 is a bottom view of the orbiting scroll.

FIG. 5 is a plan view of a frame.

FIG. 6 is a plan view of an orbiting scroll.

FIG. 7 is a vertical cross-sectional side view of the upper part in the closed container for explaining the operation of the scroll compressor of the present invention.

FIG. 8 is a plan sectional view of the scroll compressor for explaining the operation of the scroll compressor of the present invention.

FIG. 9 is another vertical cross-sectional side view of the upper part in the closed container for explaining the operation of the scroll compressor of the present invention.

FIG. 10 is another plan sectional view of the scroll compressor for explaining the operation of the scroll compressor of the present invention.

FIG. 11 is a vertical cross-sectional side view of an upper portion inside a closed container of a conventional scroll compressor.

FIG. 12 is a vertical cross-sectional side view of an upper portion in an airtight container of another conventional scroll compressor.

[Explanation of symbols]

 SC scroll compressor 1 airtight container 3 electric element 4 frame 5 rotating shaft 7 fixed scroll 8 swinging scroll 11 end plate 13 wrap 14 end plate 15 wrap 16 pin part 17 compression space 20 Oldham ring 24 oil supply passage 26 oil supply hole 27 oil groove

Claims (1)

[Claims] 1. An electric element having a rotary shaft in a hermetic container, a frame pivotally supporting the rotary shaft, a frame slidably supported by the frame and driven by the rotary shaft, and having a spiral shape on the end plate. The orbiting scroll with the wrap standing upright and the fixed scroll with the spiral wrap standing on the end plate facing the orbiting scroll are housed, and a plurality of the fixed scroll and the orbiting scroll are formed. In a scroll compressor that orbits the orbiting scroll while revolving with respect to the fixed scroll so as to perform compression by gradually reducing the compression space from the outside to the inside, in the orbiting scroll side of the frame, An oil groove formed on the surface to extend in the radial direction, and an oil supply passage for supplying lubricating oil from the rotary shaft to the oil groove. Scroll compressor.