JP2008274888A - Compressor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To maintain friction between a bearing and a crankshaft still in a small state. <P>SOLUTION: This compressor has a crankshaft 17 and a rolling bearing 321, and is provided with a passage 72 for flowing a lubricant. The vertically extending crankshaft 17 is provided with a through-hole 171 for pumping up the lubricant up to the upper end 172. The passage 72 makes the lubricant pumped up to the upper end 171 flow up to the lower side of the compressor. The rolling bearing 321 slidingly supports a main shaft 17a of the crankshaft 17. The passage 72 has first and second parts 721 and 722. The first part 721 extends up to the lower end 321b from the upper end 321a of the rolling bearing 321 via the rolling bearing 321. The second part 722 extends upward from the lower end 321b of the rolling bearing 32 on the opposite side of the main shaft 17a of the rolling bearing 321. The upper end 722a of the second part 722 is positioned on the upper side more than the lower end 321b of the rolling bearing 321. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to a compressor, and more particularly to a passage through which a lubricant flows.

  Conventionally, in a compressor, friction between the crankshaft and the bearing is reduced by introducing oil between the crankshaft and the bearing.

  Specifically, the compressor is provided with a saucer for storing oil, and once pumps up the oil in the saucer. And the pumped-up oil is guide | induced to oil between a crankshaft and a bearing through the channel | path provided in the compressor. The oil then returns to the saucer again.

  Of the passage, the portion from the lower end of the bearing to the tray was constituted only by a portion extending in the horizontal direction and a portion extending downward, or only by a portion extending downward. Therefore, most of the oil that passed between the crankshaft and the bearings immediately returned to the saucer due to its gravity.

In addition, the technique relevant to this invention is shown below.
JP 2004-293531 A

  When the compressor is driven, the oil in the tray may be temporarily depleted depending on the operating conditions. When the oil in the tray is depleted, oil cannot be supplied between the crankshaft and the bearing.

  In addition, oil that has passed between the crankshaft and the bearing immediately before depletion immediately returns to the tray.

  Therefore, the friction between the crankshaft and the bearing is increased, and the crankshaft and the bearing may possibly be damaged.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to maintain the friction between the bearing and the crankshaft as small as possible.

  A compressor according to a first invention is a compressor provided with a passage through which a lubricant flows, and includes a rotating shaft and a bearing. The rotating shaft extends vertically. The bearing slidably supports the rotating shaft. The passage has first and second portions. The first portion extends from the upper end of the bearing to the lower end of the bearing through the bearing. The second part extends upward from the lower end of the bearing on the side opposite to the rotating shaft of the bearing. The upper end of the second part is located above the lower end of the bearing.

  The compressor concerning 2nd invention is a compressor concerning 1st invention, Comprising: The upper end of a 2nd part is the same position as the upper end of a bearing, or is located above the upper end of a bearing .

  The compressor concerning 3rd invention is a compressor concerning 1st or 2nd invention, Comprising: A bearing is a rolling bearing.

  A compressor according to a fourth aspect of the present invention is the compressor according to any one of the first to third aspects of the present invention, and is further provided with a tray and a pumping mechanism, which are located below the bearing. The saucer accumulates lubricant. The pumping mechanism pumps up the lubricant on the tray to the upper side of the bearing. The passage returns the lubricant pumped up to the upper side of the bearing to the receiving pan.

  A compressor according to a fifth invention is a compressor according to any one of the first to fourth inventions, and compresses a refrigerant containing carbon dioxide as a main component.

  According to the compressor according to the first aspect of the present invention, the second portion of the passage extends upward from the lower end of the bearing, and therefore, the lubricant tends to accumulate in the second portion. Therefore, the lubricant is likely to remain between the bearing and the crankshaft at least up to the same position as the upper end of the second portion, thereby keeping the friction between the bearing and the crankshaft small. Easy to maintain.

  According to the compressor of the second invention, since the entire bearing is immersed in the lubricant, the friction between the crankshaft and the bearing remains small.

  According to the compressor of the third aspect of the invention, the rolling bearing is more likely to flow to the lower side of the bearing than the sliding bearing. Moreover, since the rolling bearing is immersed in the lubricant, noise when the bearing rolls is reduced.

  According to the compressor concerning the 4th invention, a lubricant can be circulated. Moreover, even when there is no lubricant in the tray, the lubricant remains in the second portion, so that the lubricant tends to remain between the bearing and the crankshaft.

  According to the compressor concerning the 5th invention, even when carbon dioxide is adopted as a refrigerant, the technology concerning the 1st thru / or the 4th invention is applicable.

First embodiment.
1. Structure of Scroll Compressor FIG. 1 is a diagram conceptually showing a scroll compressor 1A according to the present embodiment. In FIG. 1, a direction 91 is shown. In the following, the tip of the arrow in the direction 91 is referred to as the “upper” side, and the opposite side is referred to as the “lower” side.

  The scroll compressor 1 </ b> A includes a case 11, a fixing member 12, a compression mechanism 15, a motor 16, and a crankshaft 17. The case 11 is cylindrical and extends along the direction 91. The fixed member 12, the compression mechanism 15, the motor 16, and the crankshaft 17 are all housed in the case 11.

  The compression mechanism 15 includes a fixed scroll 24 and a movable scroll 26 and compresses the refrigerant. As the refrigerant, for example, a refrigerant containing carbon dioxide as a main component can be adopted.

  The fixed scroll 24 includes an end plate 24a and a compression member 24b. The end plate 24a is fixed to the inner wall 11a of the case 11, and the compression member 24b is connected to the lower side of the end plate 24a. The compression member 24b extends in a spiral shape, and a groove 24c is formed between the spiral members.

  The movable scroll 26 includes an end plate 26a and a compression member 26b. The compression member 26b is connected to the upper side of the end plate 26a and extends in a spiral shape. The compression member 26 b fits in the groove 24 c of the fixed scroll 24.

  In the compression mechanism 15, the space 40 between the compression member 24b and the compression member 26b is used as a compression chamber by being sealed with the end plates 24a and 26a.

  The motor 16 has a stator 51 and a rotor 52. The stator 51 is annular and is fixed to the inner wall 11 a of the case 11. The rotor 52 is provided on the inner peripheral side of the stator 51 and faces the stator 51 through an air gap.

  The crankshaft 17 extends along the direction 91 and includes a main shaft 17a and an eccentric portion 17b. The main shaft 17 a is a portion that rotates about the central shaft 90 and is connected to the rotor 52. The main shaft 17a can be grasped as a rotating shaft extending vertically.

  The eccentric portion 17b is a portion that is offset from the central shaft 90 and is connected to the upper side of the main shaft 17a. The lower part of the crankshaft 17 is slidably supported by a bearing 60.

  The fixing member 12 is specifically a housing in FIG. 1 and is fitted to the inner wall 11 a of the case 11. For example, the fixing member 12 is fitted to the inner wall 11a by a method such as press fitting or shrink fitting. The fixing member 12 may be fitted to the inner wall 11a via a seal.

  The fixing member 12 is provided with a recess 31 that opens upward in the vicinity of the central axis 90. The eccentric portion 17 b of the crankshaft 17 is accommodated in the recess 31. The fixed member 12 has a slide bearing 32. The slide bearing 32 slidably supports the main shaft 17 a that penetrates the fixing member 12 from the lower side to the recess 31.

2. Lubricant Flow The scroll compressor 1A further includes a tray 18 for storing the lubricant. The tray 18 is located below the slide bearing 32.

  The crankshaft 17 is provided with a through hole 171. The through hole 171 passes through the crankshaft 17 from the lower end 173 to the upper end 172 along a predetermined direction 91.

  As the crankshaft 17 rotates, the through hole 171 functions as a centrifugal pump. That is, when the scroll compressor 1 </ b> A is driven, the lubricant stored in the tray 18 is pumped from the lower end 173 to the upper end 172 of the crankshaft 17 through the through hole 171. From this content, the through hole 171 provided in the crankshaft 17 can be understood as a pumping mechanism.

  As described above, the eccentric portion 17b is connected to the upper side of the main shaft 17a, and the slide bearing 32 supports the main shaft 17a. Therefore, the upper end 172 of the crankshaft 17, that is, the upper end of the eccentric portion 17b is Located in. Therefore, the through-hole 171 that is a pumping mechanism can be grasped when the lubricant in the tray 18 is pumped up to the upper side of the slide bearing 32.

  The scroll compressor 1 </ b> A is provided with a passage 71, and the lubricant pumped up to the upper end 172 of the crankshaft 17 returns to the tray 18 through the passage 71. And it circulates through the through-hole 171 and the channel | path 71 again in this order. Note that the flow of the lubricant in the passage 71 is indicated by a solid line arrow in FIG.

  The pumped lubricant may be guided between the fixed scroll 24 and the movable scroll 26 and then returned to the tray 18 through the passage 71. According to this aspect, the friction between the fixed scroll 24 and the movable scroll 26 that rub against each other can be reduced.

  For example, oil can be used as the lubricant. Oil is easy to flow and reduces friction.

3. FIG. 2 is an enlarged view of the region II shown in FIG. 1 in order to clarify the shape of the passage 71.

  The passage 71 has first and second portions 711 and 712. The first portion 711 extends from the upper end 32a to the lower end 32b of the slide bearing 32 via the space between the slide bearing 32 and the main shaft 17a.

  The second portion 712 extends upward from the lower end 32 b of the slide bearing 32 on the side opposite to the main shaft 17 a of the slide bearing 32. In FIG. 2, the second portion 712 is provided on the fixing member 12.

  The upper end 712 a of the second portion 712 is located above the lower end 32 b of the slide bearing 32.

  According to the shape of the passage 71, since the second portion 712 of the passage 71 extends upward from the lower end 32 b of the slide bearing 32, the lubricant tends to accumulate in the second portion 712. Therefore, the lubricant is likely to remain between the sliding bearing 32 and the main shaft 17a at least up to the same position as the upper end 712a of the second portion 712. Thereby, even if the lubricant in the tray 18 is temporarily depleted, the friction between the slide bearing 32 and the main shaft 17a can be kept small.

  In FIG. 2, the upper end 712 a of the second portion 712 is at substantially the same position as the upper end 32 a of the plain bearing 32. For example, the position of the upper end 712a may be above the position of the upper end 32a.

  According to such a shape, since the entire slide bearing 32 is immersed in the lubricant, the friction between the main shaft 17a and the slide bearing 32 remains small.

Second embodiment.
1. Structure of Scroll Compressor FIG. 3 is a diagram conceptually showing the scroll compressor 1B according to the present embodiment. The scroll compressor 1B is provided with a rolling bearing 321 instead of the slide bearing 32 of the fixed member 12 in the scroll compressor 1A shown in FIG.

  Similar to the sliding bearing 32, the rolling bearing 321 supports the main shaft 17 a of the crankshaft 17 so as to be slidable. The rolling bearing 321 has a plurality of cylindrical rolling members 3211 that roll in the circumferential direction on the side surface of the main shaft 17a. Since the rolling member 3211 rolls around the main shaft 17a, friction with the main shaft 17a is small.

  Since the other components of the scroll compressor 1B are the same as those of the scroll compressor 1A, description thereof is omitted.

2. Lubricant Flow The scroll compressor 1B is provided with a passage 72, and the lubricant pumped up to the upper end 172 of the crankshaft 17 returns to the tray 18 through the passage 72. The flow of the lubricant in the passage 72 is indicated by a solid line arrow in FIG.

3. FIG. 4 is an enlarged view of the region IV shown in FIG. 3 in order to clarify the shape of the passage 72.

  The passage 72 has first and second portions 721 and 722. The first portion 721 extends from the upper end 321a to the lower end 321b of the rolling bearing 321 between the rolling member 3211 and the main shaft 17a and between the rolling members 321 adjacent to each other in the circumferential direction.

  The second portion 722 extends from the lower end 321 b of the rolling bearing 32 upward on the side opposite to the main shaft 17 a of the rolling bearing 321. In FIG. 2, the second portion 722 is provided on the fixing member 12.

  The upper end 722 a of the second portion 722 is located above the lower end 321 b of the rolling bearing 321.

  According to the shape of the passage 72, the second portion 722 of the passage 72 extends upward from the lower end 321 b of the rolling bearing 321, so that the second portion 722 easily collects lubricant. Therefore, the lubricant tends to remain between at least the same position as the upper end 722a of the second portion 722 between the rolling bearing 321 and the main shaft 17a. Thereby, even if the lubricant in the tray 18 is temporarily depleted, the friction between the rolling bearing 321 and the main shaft 17a can be kept small.

  In FIG. 2, the upper end 722 a of the second portion 722 is substantially at the same position as the upper end 321 a of the rolling bearing 321. For example, the position of the upper end 712a may be above the position of the upper end 321a.

  According to such a shape, since the entire rolling bearing 321 is immersed in the lubricant, the friction between the main shaft 17a and the sliding bearing 32 remains small. In addition, noise when the rolling member 3211 rolls is reduced.

  The rolling bearing 321 of the present embodiment is more likely to flow the lubricant to the lower side of the bearing than the plain bearing 32 of the first embodiment.

  In both of the first and second embodiments described above, the scroll compressors 1A and 1B have been described. However, these techniques may be applied to other compressors such as a swinging rotary compressor. it can.

It is a figure which shows notionally the scroll compressor demonstrated by 1st Embodiment. It is the figure which expanded and showed the area | region II shown by FIG. It is a figure which shows notionally the scroll compressor demonstrated by 2nd Embodiment. It is the figure which expanded and showed the area | region IV shown by FIG.

Explanation of symbols

17 Spindle (Rotating shaft)
18 Trays 32 Sliding bearings 71, 72 Passage 171 Through hole (pumping mechanism)
321 Rolling bearings 32a, 321a, 712a, 722a Upper end 32b, 321b Lower end 711, 721 First part 712, 722 Second part

Claims (5)

A compressor provided with a passage (71; 72) through which a lubricant flows,
A rotating shaft (17) extending vertically;
A bearing (32; 321) that slidably supports the rotating shaft;
The passage is
A first portion (711; 721) extending from the upper end (32a; 321a) of the bearing to the lower end (32b; 321b) of the bearing via the bearing;
A second portion (712; 722) extending upward from the lower end of the bearing on a side opposite to the rotating shaft of the bearing;
The upper end (712a; 722a) of the second portion is a compressor located above the lower end of the bearing.   The upper end (712a; 722a) of the second part (712; 722) is at the same position as the upper end (32a; 321a) of the bearing (32; 321) or more than the upper end of the bearing. The compressor according to claim 1, which is located on an upper side.   The compressor according to claim 1 or 2, wherein the bearing (321) is a rolling bearing. A tray (18) located below the bearing (32; 321) for storing the lubricant;
A pumping mechanism (171) for pumping the lubricant of the tray to the upper side of the bearing;
The compressor according to any one of claims 1 to 3, wherein the passage (71; 72) returns the lubricant pumped up to the upper side of the bearing to the tray.   The compressor according to any one of claims 1 to 4, which compresses a refrigerant containing carbon dioxide as a main component.

Images