CN1193200C

CN1193200C - Rotor compression-expansion machine for refrigerating system

Info

Publication number: CN1193200C
Application number: CNB021455244A
Authority: CN
Inventors: 顾兆林; 郁永章; 高秀峰; 冯诗愚; 张旭东
Original assignee: Xian Jiaotong University
Current assignee: Xian Jiaotong University
Priority date: 2002-12-16
Filing date: 2002-12-16
Publication date: 2005-03-16
Anticipated expiration: 2022-12-16
Also published as: KR20050034725A; CN1417478A; US20060123838A1; WO2004055451A1; AU2003222502A1; KR100677513B1

Abstract

The present invention relates to a rotor compressing-expanding machine for a refrigerating system. A working chamber is composed of an inner rotor and an outer rotor, wherein the inner rotor is used for driving the outer rotor to move; the outer rotor is arranged in a barrel-shaped casing. The inner rotor of a compressor and the inner rotor of an expander are arranged on the same shaft, and an air inlet and exhaust hole is arranged on a barrel body or an end cover. The radial dimension of the inner rotors and the outer rotors of the compressor and the expander are the same, and the axial dimension is determined by the capacity property or the optimum design of the compressor and the expander. The compressor can be designed into single-stage compression or two-stage compression according to requirements. The present invention has the advantages of simple processing, installation and technology of the structure, and compact structure. Simultaneously, the structure has good force balance performance, the structure can bear high pressure, the requirements of the two-stage compression and the single-stage expansion of carbon dioxide of the refrigerating system are satisfied, and the thermal performance of the trans-critical refrigeration cycle of the carbon dioxide is improved.

Description

A kind of refrigeration system rotor compression-decompressor

One, technical field

The present invention relates to a kind of high-efficiency air-condition and refrigeration system, particularly a kind of refrigeration system rotor compression-decompressor.

Two, background technique

Carbon dioxide had more than 100 year as the history that refrigeration agent uses, and once was used for refrigerating plant peculiar to vessel, ice making and other food product freezing units, also comprised air-conditioning system.The 1980s, the Lorentzen of Norway and Pettersen etc. have developed and have utilized the motorcar air conditioner model machine of carbon dioxide for working medium, and have carried out a series of researchs, cause that once more people are to the interest of carbon dioxide as refrigeration working medium.

Carbon dioxide is as its advantage of refrigeration agent, once used the long period as refrigeration agent, nontoxic, there is not combustibility (in fact being the extinguishing agent of function admirable), low price, source are enriched, need not be reclaimed, can mix with plain oil, volume refrigerating capacity compressor is 5 times of chlorodifluoromethane approximately, therefore, and during identical refrigerating capacity, the cylinder of compressor volume reduces a lot, and compression ratio is little.Carbon dioxide is the working pressure height of system as the shortcoming of refrigeration agent, and maximum pressure reaches 10Mpa (100bar), even higher.Because the critical temperature of carbon dioxide is low, therefore, refrigeration cycle adopts strides critical refrigeration cycle (trans-critical cycle).Research about carbon dioxide coolant at present mainly concentrates on the automotive air-conditioning system (Gu Zhaolin, the environmental effect of the new development-refrigeration working medium of compression-type refrigeration technology and characteristics thereof, fluid machinery, Vol.29 (10), 2001) that critical refrigeration cycle is striden in employing.

Because the pressure difference in the CO 2 cross-critical refrigeration system between cooler and the vaporizer is very big, can utilize a decompressor to reclaim its pressure energy, further improve refrigeration performance, under for example identical evaporating temperature, its performance COP of system that two stage compression, one-level expand reaches 3.97, the COP (3.88) that is higher than existing chlorodifluoromethane, and its performance COP of the system of two stage compression direct expansion has only 2.89 (M.S.Zhu, L.Shi, Researches on the CO2 transcritical R/AC/HP systems inChina, Proceedings of the 5 ^ThIIR-Gustav Lorentzen conference on naturalworking fluids at Guangzhou, China, September 17-20,2002)

The system that carbon dioxide two stage compression, one-level are expanded pushes practicality to, key is the structure problem of compressor and decompressor, general scheme can be reciprocal compressor and reciprocating expansion engine, the scroll compressor of employing and scroll expansion machine also can be arranged, but above-mentioned two kinds of organization plan overall structures and the equal more complicated of technical requirements, it is very big that engineering is used difficulty, the new compressor and the integral structure of decompressor must be arranged, could solve the key issue of present carbon dioxide two stage compression, one-level swell refrigeration system

Three, summary of the invention

The objective of the invention is to overcome the deficiency of the integral structure of compressor and decompressor, proposed a kind of carbon dioxide two stage compression, one-level swell refrigeration system with rotor compression-decompressor.

For achieving the above object, the technical solution used in the present invention is: comprise the running shaft that is connected with motor, on running shaft, be disposed with left end cap, left clapboard, right clapboard and right end cap, be characterized in, left end cap on running shaft, left clapboard, also be provided with petal internal rotor and external rotor between right clapboard and the right end cap, left end cap and internal rotor, external rotor, left clapboard and I level cylindrical shell have been formed a stage compressor jointly, left clapboard and internal rotor, external rotor, right clapboard and II level cylindrical shell have constituted two stage compressor jointly, right clapboard, internal rotor, external rotor, right end cap and decompressor cylindrical shell have constituted decompressor jointly, internal rotor and external rotor engagement and constituted air-breathing district and exhaust area, air-breathing district and exhaust area respectively with a stage compressor, the suction port and the exhaust port of two stage compressor and decompressor are connected, and on left end cap, offer the suction port and the exhaust port of a stage compressor, the suction port of one stage compressor is connected with the outlet of vaporizer through pipeline, the exhaust port of one stage compressor is connected with the inlet end of interstage cooler through pipeline, the exhaust end of interstage cooler is connected with the suction port of two stage compressor through pipeline, the exhaust port of two stage compressor is connected with the inlet end of cooler through pipeline, the exhaust end of cooler is connected with the inlet hole of decompressor through pipeline, the tap hole of decompressor is connected through another inlet end of pipeline and interstage cooler, and another exhaust end of interstage cooler is connected with the suction port of vaporizer through pipeline.

Another characteristics of the present invention are: the internal rotor molded lines is made of the equal space line of curtate epicycloid, and external rotor is made of three sections circular arcs; The radial dimension of one stage compressor, two stage compressor and decompressor is identical, axial dimension is different; The suction port of one stage compressor, exhaust port are separately positioned on the left end cap; The suction port of two stage compressor, exhaust port are separately positioned on left clapboard and the right clapboard; The inlet hole of decompressor and tap hole are separately positioned on end cap right clapboard and the end cap right end cap.

Because the present invention adopts the coaxial installation of compressor and decompressor, the radial dimension unanimity, main parts size is identical, therefore, whole compressor-decompressor structure processing, simple, the compact structure of mounting process, this structural capacity balance quality is good simultaneously, can bear high pressure, has satisfied the requirement of the refrigeration system that carbon dioxide two stage compression, one-level expand well.

Four, description of drawings

Fig. 1 is the process principle figure of refrigeration system of the present invention;

Fig. 2 is the structure principle chart that two stage compression of the present invention, one-level expand;

Fig. 3 is the structural representation of the active chamber that forms of inner and outer rotors of the present invention engagement and air inlet area, exhaust area.

Five, embodiment

Below in conjunction with accompanying drawing structural principle of the present invention and working principle are described in further detail.

Referring to Fig. 1,2, the present invention includes the running shaft 15 that is connected with motor 1, on running shaft 15, be disposed with left end cap 18, left clapboard 17, right clapboard 19 and right end cap 20, left end cap 18 on running shaft 15, left clapboard 17, also be provided with petal internal rotor 11 and external rotor 12 between right clapboard 19 and the right end cap 20, left end cap 18 and internal rotor 11, external rotor 12, left clapboard 17 and I level cylindrical shell 16 have been formed a stage compressor 21 jointly, left clapboard 17 and internal rotor 11, external rotor 12, right clapboard 19 and II level cylindrical shell 24 have constituted two stage compressor 22 jointly, right clapboard 19, internal rotor 11, external rotor 12, right end cap 20 and decompressor cylindrical shell 25 have constituted decompressor 23 jointly, internal rotor 11 is with external rotor 12 engagements and constituted air-breathing district 13 and exhaust area 14, air-breathing district 13 and exhaust area 14 respectively with a stage compressor 21, the suction port of two stage compressor 22 and decompressor 23 and exhaust port are communicated with, the suction port 2 of one stage compressor 21 is connected through the outlet of pipeline with vaporizer 10, the exhaust port 3 of one stage compressor 21 is connected with interstage cooler 4 one inlet ends through pipeline, interstage cooler 4 one exhaust ends are connected through the suction port 5 of 22 grades of pipeline and two stage compressors, the exhaust port 6 of two stage compressor 22 is connected with cooler 7 inlet ends through pipeline, cooler 7 exhaust ends are connected with the inlet hole 8 of decompressor 23 through pipeline, the tap hole 9 of decompressor 23 is connected with interstage cooler 4 another imports through pipeline, and interstage cooler 4 another exhaust ports are connected through the suction port of pipeline with vaporizer 10.

Referring to Fig. 2, radial dimension of the present invention is identical, one stage compressor 21 of different axial dimensions, two stage compressor 22 and decompressor 23, their internal rotor 11 is installed on the running shaft 15 jointly, running shaft 15 is connected with motor 1, and external rotor 12 is encapsulated in I level cylindrical shell 16 respectively, in II level cylindrical shell 21 and the decompressor cylindrical shell 22, there is left end cap 18 end, the suction port 2 of one stage compressor 21, exhaust port 3 is separately positioned on the left end cap 18, the suction port 5 of two stage compressor 22, exhaust port 6 is separately positioned on left clapboard 17 and the right clapboard 19, and the inlet hole 8 of decompressor 23 and tap hole 9 are separately positioned on right clapboard 19 and the right end cap 20.

Referring to Fig. 3, internal rotor 11 of the present invention is petal, and internal rotor 11 and external rotor 12 engagements constitute active chamber and air-breathing district 13 and exhaust area 14, and internal rotor 11 molded lines are made of the equal space line of curtate epicycloid, and external rotor 12 is made of three sections circular arcs.

Working principle of the present invention is as follows: internal rotor 11 and external rotor 12 engagements, be contained in I level cylindrical shell 16, II level cylindrical shell 24 and the decompressor cylindrical shell 25 and with left clapboard 17, right clapboard 19, right end cap 20 and left end cap 18 be mutually permanently connected common constitute a stage compressor 21, two stage compressor 22 and decompressor 24, internal rotor 11 links to each other with running shaft 15 and motor 1, motor 1 drives internal rotor 11 and rotates, internal rotor 11 drives external rotor 12 and rotates, and finishes the continuous process of the air-breathing-compression-exhaust of a stage compressor 21 and two stage compressor 22; The work done of decompressor 23 passes to a stage compressor 21 and two stage compressor 22 by running shaft 15, reduces motor 1 driving power.

One stage compressor 21, two stage compressor 22 and decompressor 23 are combined, and control flowing of whole refrigeration system working medium, realize the refrigeration purpose.Concrete working medium flow process is as follows: the low temperature and low pressure steam of vaporizer 10, sucked by a stage compressor 21 through pipeline and suction port 2, through overcompression, temperature and pressure raise, exhaust port 3 by a stage compressor 21 enters interstage cooler 4 coolings through pipeline, cooled gas is sucked by two stage compressor 22 through the suction port 5 of pipeline and two stage compressor 22, once more through overcompression, become pressurized gas, exhaust port 6 by two stage compressor 22 enters cooler 7 coolings through pipeline, become highly pressurised liquid, highly pressurised liquid is linked to each other with the inlet hole 8 of decompressor 23 through pipeline by cooler 7 exhaust ends and enters decompressor 23 expansion workings, become medium temperature, the gas-fluid two-phase mixture of pressure enters interstage cooler 4 by the tap hole 9 of decompressor 23 through another inlet end of pipeline and interstage cooler 4, and the exhaust of cooling off a stage compressor 21, the liquid phase of gas-fluid two-phase mixture enters vaporizer 10 through pipeline after further reducing pressure, absorbing heat becomes low temperature and low pressure steam.

The power part that one stage compressor 21 and two stage compressor 22 compressions need is from the expansion work of decompressor 23, and all the other are by motor 1 input.

Claims

1, a kind of refrigeration system rotor compression-decompressor, comprise the running shaft [15] that is connected with motor [1], on running shaft [15], be disposed with left end cap [18], left clapboard [17], right clapboard [19] and right end cap [20], it is characterized in that: the left end cap [18] on running shaft [15], left clapboard [17], also be provided with petal internal rotor [11] and external rotor [12] between right clapboard [19] and the right end cap [20], left end cap [18] and internal rotor [11], external rotor [12], left clapboard [17] and I level cylindrical shell [16] have been formed a stage compressor [21] jointly, left clapboard [17] and internal rotor [11], external rotor [12], right clapboard [19] and II level cylindrical shell [24] have constituted two stage compressor [22] jointly, right clapboard [19], internal rotor [11], external rotor [12], right end cap [20] and decompressor cylindrical shell [25] have constituted decompressor [23] jointly, internal rotor [11] and external rotor [12] mesh and have constituted air-breathing district [13] and exhaust area [14], air-breathing district [13] and exhaust area [14] respectively with a stage compressor [21], the suction port and the exhaust port of two stage compressor [22] and decompressor [23] are connected, and on left end cap [18], offer the suction port [2] and the exhaust port [3] of a stage compressor [21], the suction port [2] of one stage compressor [21] is connected through the outlet of pipeline with vaporizer [10], the exhaust port [3] of one stage compressor [21] is connected through the inlet end of pipeline with interstage cooler [4], the exhaust end of interstage cooler [4] is connected with the suction port [5] of two stage compressor [22] through pipeline, the exhaust port [6] of two stage compressor [22] is connected through the inlet end of pipeline with cooler [7], the exhaust end of cooler [7] is connected with the inlet hole [8] of decompressor [23] through pipeline, the tap hole [9] of decompressor [23] is connected with another inlet end of interstage cooler [4] through pipeline, and another exhaust end of interstage cooler [4] is connected through the suction port of pipeline with vaporizer [10].

2, refrigeration system according to claim 1 rotor compression-decompressor, it is characterized in that: said internal rotor [11] molded lines is made of the equal space line of curtate epicycloid, and external rotor [12] is made of three sections circular arcs.

3, refrigeration system according to claim 1 rotor compression-decompressor, it is characterized in that: the radial dimension of a said stage compressor [21], two stage compressor [22] and decompressor [23] is identical, axial dimension is different.

4, refrigeration system according to claim 1 rotor compression-decompressor, it is characterized in that: suction port [2], the exhaust port [3] of a said stage compressor [21] are separately positioned on the left end cap [18].

5, refrigeration system according to claim 1 rotor compression-decompressor, it is characterized in that: the suction port [5] of said two stage compressor [22], exhaust port [6] are separately positioned on left clapboard [17] and the right clapboard [19].

6, refrigeration system according to claim 1 rotor compression-decompressor, it is characterized in that: the inlet hole [8] of said decompressor [23] and tap hole [9] are separately positioned on end cap right clapboard [19] and the end cap right end cap [20].