Multi-cylinder rotary compressor

A technology for a rotary compressor and a compression mechanism, applied in the field of compressors, can solve problems such as oil shortage, crankshaft and bearing wear failures of the rotary compressor, and achieve the effects of reducing sliding wear and reducing compressor vibration

Inactive Publication Date: 2015-12-02
GUANGDONG MEIZHI COMPRESSOR +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] On the other hand, the more market failure of rotary compressors is the wear failure of the crankshaft and bearings
Most of the reasons are due to the increase of bearing load during high-speed and high-load operation, and the lack of oil during high-speed operation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0067] figure 1 In the illustrated multi-cylinder rotary compressor 1 , the outer periphery of the stator 4 a constituting the motor 4 and the outer periphery of the intermediate partition plate 50 provided at the center of the compression mechanism unit 5 are fixed to the inner diameter of the hermetic casing 2 . The casing 2 is composed of three parts: a cylindrical casing 2a, an upper end plate 2b and a lower end plate 2c welded to the upper and lower ends thereof. Usually, the cylindrical shell 2a and the stator 4a are fixed by shrink fit, and the middle partition plate 50 and the shell 2 are fixed by spot welding at 3 to 5 points. In addition, oil 8 is stored at the bottom of the housing 2 .

[0068] The compression mechanism part 5 is composed of the first cylinder 11 and the second cylinder 21, the first seal plate 45 and the second seal plate 40 connected to these opening surfaces, and the seal between the first cylinder 11 and the second cylinder 21 and connected to ...

Embodiment 2

[0090] The rotary compressor has a small internal volume of the casing relative to the displacement. Due to the high-speed rotation of the rotor 4b, a large amount of gas discharged from the two compression chambers agitates the oil 8 of the cylindrical case 2a, together with the discharged gas, and is ejected to the upper space of the motor through the motor 4. The problem is that due to high-speed operation, the oil cannot return to the lower part of the cylindrical case 2a, and a large amount of oil may be discharged from the exhaust pipe into the refrigeration cycle system.

[0091] Embodiment 2 is a means of improving this problem, and the effect of the main shaft outer peripheral hole 35c adopted in Embodiment 1 can be greatly improved. exist Figure 4 Among them, the outer periphery of the cylindrical plate 66 fixed to the upper end of the rotor 4b by the bushing screw 67 has several outer peripheral holes 66a. Due to the centrifugal separation effect of the high-spee...

Embodiment 3

[0095] Figure 6 The first ball bearing 25 is provided in the middle partition plate 50, and the second ball bearing 27 is provided in the end plate bearing 70. As a substitute for the needle bearing, a ball bearing can be used. in addition, Figure 6 The arrangement of the first slide piece 63 and the second slide piece 64 is shown.

[0096] Compared with needle roller bearings and ball bearings, the outer diameter is larger and the thickness is smaller. Therefore, it is difficult to use the outer diameter of the ball bearing as the inner diameter of the intermediate bearing 52 . Because the inner diameter of the intermediate bearing 52 is very large to the center of the compression chamber, the sliding surface of the piston is limited, and the amount of eccentricity of the piston becomes smaller. In order to solve this problem, Figure 6 It shows how the outer diameter portion of the first ball bearing 25 can be housed in the upper and lower middle partition plate 50 whi...

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Abstract

The invention discloses a multi-cylinder rotary compressor. The multi-cylinder rotary compressor comprises a sealing shell, wherein the sealing shell comprises a cylindrical shell and an upper end plate; a motor and a compression mechanism part are accommodated in the sealing shell; and the motor has a stator and a rotor. The compression mechanism part comprises a first compression cavity and a second compression cavity, a middle separation plate having a middle bearing, a first piston and a second piston, a first slide piece and a second slide piece, a crankshaft, and a first sealing plate and a second sealing plate, wherein the crankshaft comprises a first eccentric shaft and a second eccentric shaft, a middle shaft for connecting the eccentric shafts, a secondary shaft connected with the first eccentric shaft and a main shaft connected with the second eccentric shaft and fixed with the rotor; at least one of the first eccentric shaft and the second eccentric shaft and the crankshaft are in a separate combination type; at least the middle shaft slidingly fits a middle bearing; and the main shaft slidingly fits an end plate bearing in the upper end plate. The multi-cylinder rotary compressor improves the reliability of the crankshaft operating with high speed and high load.

Description

technical field [0001] The invention relates to the field of compressors, in particular to a multi-cylinder rotary compressor. Background technique [0002] Rotary compressors used and popularized in air conditioners, which consume the most power among home appliances, need to improve APF and improve noise and vibration. In addition, the small and light weight of the rotary compressor and the high-speed operation brought by the inverter motor increase the heating capacity of the air conditioner and improve the APF. To meet these requirements, the design of multi-cylinder rotary compressors needs to be optimized. [0003] On the other hand, the most common market failure of rotary compressors is the wear failure of the crankshaft and bearings. Most of the reasons are due to the increase of bearing load during high-speed and high-load operation, and the lack of oil during high-speed operation. Therefore, these operating conditions require improved crankshaft and bearing rel...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04C23/02F04C29/00F04C18/356
Inventor 小津政雄赖化鸿王玲
Owner GUANGDONG MEIZHI COMPRESSOR
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