Apparatus and method for carrying out a vapour refrigeration process
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
F25B-009/06
F25B-009/00
F25B-011/02
F25B-031/02
F25B-040/02
F25B-043/00
출원번호
US-0884595
(2018-01-31)
등록번호
US-10254018
(2019-04-09)
우선권정보
DE-10 2015 214 705 (2015-07-31)
발명자
/ 주소
Nickl, Joerg
출원인 / 주소
BITZER Kuehlmaschinenbau GmbH
대리인 / 주소
Reinhart Boerner Van Deuren P.C.
인용정보
피인용 횟수 :
0인용 특허 :
2
초록▼
The present invention relates to an apparatus and to a method for carrying out a vapour refrigeration process. The apparatus has a motor-operated main compressor which is equipped to suck-in a mass flow of a fluid serving as a refrigerant which is at evaporating pressure level and to compress this m
The present invention relates to an apparatus and to a method for carrying out a vapour refrigeration process. The apparatus has a motor-operated main compressor which is equipped to suck-in a mass flow of a fluid serving as a refrigerant which is at evaporating pressure level and to compress this mass flow to a high pressure level, and also a high-pressure heat exchanger which is equipped to cool the mass flow of the fluid at a high pressure level, to increase a density and to reduce a temperature of the fluid. Also provided is an expander which is equipped to expand the mass flow of the fluid coming from the high pressure heat exchanger to evaporating pressure level in work-performing manner, and an evaporator which is equipped to absorb heat such that the density of the fluid decreases as it passes through the evaporator and the temperature of the mass flow coming from the expander at evaporating pressure and the temperature of the fluid being fed through the evaporator increase. Finally, there is a sub-cooler which is connected downstream of the high-pressure heat exchanger and upstream of the expander, wherein, downstream of the sub-cooler and upstream of the expander, part of the fluid is divertible from the mass flow and expandable by means of a high-pressure regulating valve to an intermediate pressure level so that the fluid which is then at the intermediate pressure level absorbs heat in a counter-flow arrangement in the sub-cooler and thereby additionally sub-cools the mass flow at high pressure level, and also a high-pressure compressor which is mechanically directly connected to the expander and is equipped to compress, to the high-pressure level, only that part of the fluid that is diverted upstream of the expander and is being fed in counter-flow in the sub-cooler, and to mix this fluid, upstream of the high-pressure heat exchanger, with the mass flow coming from the motor-operated main compressor.
대표청구항▼
1. Apparatus for carrying out a vapour refrigeration process comprising a motor-operated main compressor which is equipped to suck in a mass flow of a fluid which serves as a refrigerant and is at evaporating pressure level and to compress this mass flow to a high pressure level, a high pressure hea
1. Apparatus for carrying out a vapour refrigeration process comprising a motor-operated main compressor which is equipped to suck in a mass flow of a fluid which serves as a refrigerant and is at evaporating pressure level and to compress this mass flow to a high pressure level, a high pressure heat exchanger which is equipped to cool the mass flow of the fluid that is at a high pressure level, to increase a density and to reduce a temperature of the fluid,an expander which is equipped to expand the mass flow of the fluid coming from the high pressure heat exchanger to the evaporating pressure level in work-performing manner,an evaporator which is equipped to absorb heat so that the density of the fluid when going through the evaporator decreases and the temperature of the mass flow coming from the expander at evaporating pressure level and the temperature of the fluid being fed through the evaporator increase,a sub-cooler which is connected downstream of the high pressure heat exchanger and upstream of the expander,wherein a part of the mass flow of the fluid which is at a high pressure level is arranged to be branched off after the sub-cooler and before the expander and to be expanded by means of a high pressure regulating valve to an intermediate pressure level so that the fluid which is then at intermediate pressure level absorbs heat in a counter-flow arrangement in the sub-cooler and thereby subcools the mass flow which is at high pressure level,a high pressure compressor which is mechanically connected directly to the expander and is equipped to compress exclusively the mass flow of the fluid at intermediate pressure level which was branched off before the expander and is flowing counter to the mass flow of the fluid at high pressure level which is being fed through the sub-cooler and to mix it before the high pressure heat exchanger (H) with the mass flow coming from the motor-operated main compressor. 2. An apparatus in accordance with claim 1, wherein, after the expander, there is arranged an accumulator which is equipped to separate a liquid phase of the fluid and a vapour phase of the fluid, wherein the liquid phase is storable, expandable to the pressure of evaporation by an injector valve and the vapour phase of the fluid is expandable by a pressure retaining valve, wherein the expanded liquid phase is arranged to be supplied to the evaporator and the expanded vapour phase is mixable after the evaporator into the mass flow of the fluid coming from the evaporator. 3. An apparatus in accordance with claim 1, wherein the expander and the high pressure compressor are arranged in a common housing. 4. An apparatus in accordance with claim 1, wherein a piston displacement ratio between the expander and the high pressure compressor is maintained between 0.5 and 0.75. 5. An apparatus in accordance with claim 1, wherein work spaces of the expander are controllable by a main slide valve and an auxiliary slide valve which are arranged centrally between the work spaces. 6. An apparatus in accordance with claim 5, wherein the main slide valve and/or the auxiliary slide valve is/are in the form of flat slide valves. 7. An apparatus in accordance with claim 5, wherein the auxiliary slide valve is movable by working pistons by means of at least two pins. 8. An apparatus in accordance with claim 7, wherein a piston rod is connected to the working pistons in releasable manner. 9. Method for carrying out a vapour refrigeration process, in which a mass flow of a fluid which is at evaporating pressure level and serves as a refrigerant is sucked in by a motor-operated main compressor and compressed to a high pressure level, the mass flow of the fluid which is at a high pressure level is cooled in a high pressure heat exchanger, whereby a density is increased and a temperature of the fluid is reduced,the fluid coming from the high pressure heat exchanger is expanded in an expander in work-performing manner to evaporating pressure level,wherein the expander is mechanically connected directly to a high pressure compressor,the fluid coming from the expander is fed to an evaporator and absorbs heat so that the density decreases and the temperature of the mass flow coming from the expander which is at evaporating pressure level increases,wherein, after the high pressure heat exchanger, the fluid is fed through a sub-cooler and a part of the fluid is branched off between the sub-cooler and before the expander from the mass flow which is at the high pressure level and is being fed through the sub-cooler and is expanded to an intermediate pressure level by means of a high pressure regulating valve,thereafter, in the sub-cooler is fed in counter-flow to the mass flow at high pressure level that is flowing therethrough, absorbs heat and the mass flow which is at high pressure level is thereby subcooled,and, after passing through the sub-cooler, passes through the high pressure compressor, whereby exclusively the fluid being fed in counter-flow is compressed by the high pressure compressor to high pressure level and, before the high pressure heat exchanger, is mixed with the mass flow coming from the motor-operated main compressor. 10. A method in accordance with claim 9, wherein, after the expander, the fluid is fed into an accumulator in which a liquid phase of the fluid is separated from a vapour phase of the fluid and the liquid phase is expanded to the pressure of evaporation by an injector valve and the vapour phase of the fluid is expanded by a pressure retaining valve and, after the evaporator, is mixed with the mass flow of the fluid coming from the evaporator. 11. A method in accordance with claim 9, wherein carbon dioxide is used as the fluid.
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