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rotary compressor

A technology of rotary compressors and compression chambers, which is applied in the direction of rotary piston machines, rotary piston pumps, rotary piston/swing piston pump components, etc. It can solve the problems that the piston cannot be installed on the eccentric part, etc., and achieve suppression Reliability drop, effect of suppressing drop in load capacity

Active Publication Date: 2022-06-17
DAIKIN IND LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

With such a structure, when the piston is assembled to the eccentric portion while moving the piston in the axial direction of the drive shaft from the main shaft portion and the counter shaft portion, the piston abuts against the axial end surface of the eccentric portion and cannot move further along the shaft. to move, so that the piston cannot be installed on the eccentric part

Method used

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no. 1 approach 》

[0070] A first embodiment of the present invention will be described.

[0071] - The overall structure of the compressor -

[0072] like figure 1 As shown, the compressor of the present embodiment is a hermetic rotary compressor 1 . In the rotary compressor 1 , the compression mechanism 15 and the electric motor 10 are accommodated in the casing 2 . The rotary compressor 1 is installed in a refrigerant circuit that performs a vapor compression refrigeration cycle, and compresses the refrigerant after sucking in the refrigerant evaporated by the evaporator.

[0073] The casing 2 is a cylindrical airtight container in an upright state. The casing 2 includes a cylindrical trunk portion 3 and a pair of end plates 4 and 5 that block the ends of the trunk portion 3 . A suction pipe (not shown) is attached to the lower part of the trunk portion 3 . A discharge pipe 6 is attached to the upper end plate 4 .

[0074] The electric motor 10 is arranged in the upper part of the inner...

no. 1 approach

[0196] In addition, in the first embodiment, the drive shaft 70 is configured such that the distance r, which is the minimum value of the distances from the rotation center axis 70 a of the drive shaft 70 to the outer peripheral surface of the upper eccentric portion 75 , 8 Radius R at the main shaft portion 72 M above (r 8 =R eU -e U ≥R M ). That is, the drive shaft 70 is configured such that the outer surface of the drive shaft 70 is not recessed toward the eccentric side at the upper eccentric portion 75 . Therefore, when the lower piston 45 and the upper piston 40 are assembled to the lower eccentric portion 76 and the upper eccentric portion 75 , the drive shaft 70 can be inserted into the lower piston 45 from the counter shaft portion 74 side, and can be inserted from the main shaft portion 72 side from the main shaft portion 72 side. The upper piston 40 is inserted for assembly. Accordingly, instead of assembling the upper piston 40 to the upper eccentric portion ...

other Embodiment approach

[0198] The above-mentioned embodiment may adopt the following structures.

[0199] In the above-described first embodiment, the first connection portion is formed between the secondary shaft portion 74 and the lower eccentric portion 76 so that the drive shaft 70 satisfies R eL -e L S , however, the first connection portion according to the present invention may be formed between the main shaft portion 72 and the upper eccentric portion 75 so that the drive shaft 70 satisfies R eU -e U M .

[0200] Specifically, in the above-described first embodiment, the lower cylinder 35 constitutes the first cylinder, the lower piston 45 constitutes the first piston, the lower eccentric portion 76 constitutes the first eccentric portion, and the counter shaft portion 74 constitutes the first eccentric portion. For the shaft portion, the upper cylinder 30 constitutes the second cylinder, the upper piston 40 constitutes the second piston, the upper eccentric portion 75 constitutes the sec...

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Abstract

In the rotary compressor (1), a lower connecting portion (90) is provided between the lower eccentric portion (76) of the drive shaft (70) and the countershaft portion (74), and the lower eccentric portion (76) The radius R eL Subtract the eccentricity e of the lower eccentric part (76) from L The resulting distance is less than the radius R of the secondary shaft (74) S , the lower connecting portion (90) is configured such that the outer surface does not protrude from the outer surface of the lower eccentric portion (76), and the height H CL Less than the height H of the lower piston (45) PL . An inner peripheral groove (48) extending in the circumferential direction is formed at the end of the lower connecting portion (90) side of the inner peripheral surface of the lower piston (45), and the lower piston (45) is located at the lower connecting portion (90). ) and the inner peripheral surface is outside the outer peripheral surface of the lower eccentric part (76), the inner peripheral groove (48) is used to avoid the inner peripheral surface of the lower piston (45) Abut.

Description

technical field [0001] The present invention relates to a rotary compressor that compresses fluid after suction. Background technique [0002] Heretofore, there has been known a rotary compressor that eccentrically rotates a piston in a cylinder to compress a refrigerant. In such a rotary compressor, by not increasing the diameter of the eccentric portion of the drive shaft and the height of the cylinder, only the amount of eccentricity is increased, so that the sliding loss of the cylinder and the piston is not increased. An increase in capacity is sought (for example, refer to the following Patent Document 1). [0003] However, in the above-described rotary compressor, when the eccentric amount is increased while keeping the diameter of the eccentric portion of the drive shaft constant, the outer surface of the eccentric portion on the opposite side to the eccentric side, that is, the outer surface of the reverse eccentric side is located more than the outer surface of th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04C18/356F04C18/32F04C23/00F04C29/00
CPCF04C18/32F04C18/356F04C29/0057F04C23/001F04C29/0071F04C2240/60
Inventor 外岛隆造西村公佑东洋文
Owner DAIKIN IND LTD
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