EP0147855B1 - Système frigorifique - Google Patents
Système frigorifique Download PDFInfo
- Publication number
- EP0147855B1 EP0147855B1 EP84116379A EP84116379A EP0147855B1 EP 0147855 B1 EP0147855 B1 EP 0147855B1 EP 84116379 A EP84116379 A EP 84116379A EP 84116379 A EP84116379 A EP 84116379A EP 0147855 B1 EP0147855 B1 EP 0147855B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- valve
- evaporator
- valve body
- chamber
- differential pressure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired
Links
Images
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/30—Expansion means; Dispositions thereof
- F25B41/31—Expansion valves
- F25B41/33—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant
- F25B41/335—Expansion valves with the valve member being actuated by the fluid pressure, e.g. by the pressure of the refrigerant via diaphragms
Definitions
- the present invention relates to a refrigerating system according to the precharacterizing portion of claim 1.
- Improvement in power efficiency of the refrigerator is achieved by balancing the cooling medium pressure before and after the compressor when the compressor is stopped and by blocking the flow of condensed medium into the evaporator while at the same time keeping the high pressure of the condensed medium in the condensor, in order to reduce the restarting load.
- the function of said differential pressure valve depends essentially from the reliability and the resilience of said foldable skin which, however, cannot be guaranteed.
- the differential pressure valve V1 as shown in Fig. 1, has a primary port 2 and a secondary port 3 formed in its body 1. Between these ports is formed a valve seat 4 with which a ball 5 comes into or out of contact. The ball 5 is provided on the secondary port side.
- a diaphragm 8 which is held at its periphery by upper and lower covers 6, 7.
- a pressure chamber is formed in the upper cover 6 and is communicated with the pressure introducing tube F.
- a valve rod 9 is abutted against the underside of the diaphragm 8 and a spring 10 is installed between the rod 9 and the lower cover 7.
- the primary port 2 is connected with a pipe E1 coming from the capillary tube C and the secondary port 3 with a pipe E2 leading to an evaporator D described below.
- the differential pressure valve is actuated by a small pressure difference between the pressure on the rotary compressor suction side and the relatively low pressure at the entrance of the evaporator. Therefore, once the operation starts, the pressure at the entrance of the evaporator becomes higher than the pressure on the suction side of the compressor whatever the external atmospheric condition may be. This enables the valve to be opened by a small spring load. That is, the differential pressure valve can be actuated by a slight pressure increase at the suction of the rotary compressor caused by the back flow of high pressure liquid. Thus, it is possible to prevent the back flow of high pressure liquid to the evaporator by rapidly actuating the differential pressure valve when the rotary compressor stops.
- a capillary tube is provided as a throttle before the differential pressure valve.
- the cooling medium after passing through the throttle is reduced in pressure and can absorb heat, and therefore there is an energy loss in the pipe section leading to the refrigerating box.
- the present invention has throttles before and after the differential pressure valve, with all these installed outside the refrigerating box, to perform the pressure reduction in two stages, thereby preventing energy loss while maintaining response speed of the differential pressure valve when the compressor operation stops.
- FIG. 2 shows an embodiment of the present invention.
- a rotary compressor A, a condenser B, a capillary tube C, a differential pressure valve V1, a second capillary tube C', an evaporator D, and a check V2 are provided. More specifically, said condenser B and said evaporator D are connected in series with each other.
- a first capillary tube C is provided in said series connection between said condenser B and evaporator D.
- Said rotary compressor A has a delivery side and a suction side. Said delivery side is connected to the condenser B whereas said suction side is connected to the evaporator D. Between said evaporator D and the suction side is provided the check valve V2.
- Said differential pressure valve V1 is provided between the first capillary tube C and the evaporator D and has a valve section Vs and the control section Cs.
- Said second capillary tube C' is provided between the differential pressure tube V1 and the evaporator D.
- Said valve section Vs of the differential pressure valve V1 includes a valve body 1 having a primary port 2 and a secondary port 3.
- Said primary port 2 communicates. with the first capillary tube C whereas said secondary port 3 communicates with the second capillary tube C'.
- said primary port 2 defines a valve seat 4 within the valve body 1.
- Said valve body 1 has a bore l' formed therein communicating with the first primary port 2 and the second primary port 3.
- a ball is housed within said bore 1' and adapted to rest on said valve seat 4.
- Said valve body 1 is formed with an annular groove 1" around said bore 1' at an axial end thereof.
- Said control section Cs includes a housing H, a diaphragm 8 provided within said housing H to divide the same into a first chamber R1 and a second chamber R2 and a valve rod 9 extending within said second chamber longitudinally movably.
- Said valve rod 9 has a ring member 9' attached to the first end thereof to abut against the diaphragm 8.
- said diaphragm 8 is held at its periphery by upper and lower covers 6 and 7.
- Said first chamber R1 of the control section Cs communicates with the pressure introducing tube F.
- Said lower cover 7 has an opening to communicate said second chamber with the secondary port 3.
- Said valve body 1 is attached to the lower cover 7 such that said annular groove 1" and said bore 1' communicates with the second chamber R2.
- valve rod 9 is allowed to extend out of the control section Cs into the bore 1' to actuate the ball 5 at a second end thereof for closure of the primary port 2.
- a coil spring 10 within said annular groove 1" between the body 1 and the ring member 9'.
- a star-shaped leaf spring 23 having radially extending portions is provided between the coil spring 10 and the ring member 9'. Said radially bent portions are bent to extend within said annular groove 1" and expand radially outward to contact the valve body 1 within the annular groove 1".
- the differential pressure valve can be quickly actuated. Also the capillary tube C' as a second stage throttle to achieve a desired pressure reduction can be installed inside the refrigerating box thus eliminating energy loss.
- the differential pressure valve can rapidly be actuated when the rotary compressor is stopped, thereby reducing the restarting load and eliminating energy loss during operation.
Landscapes
- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Fluid Mechanics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Safety Valves (AREA)
- Cold Air Circulating Systems And Constructional Details In Refrigerators (AREA)
Claims (6)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP245324/83 | 1983-12-28 | ||
JP58245324A JPS60140072A (ja) | 1983-12-28 | 1983-12-28 | 差圧開閉弁付冷凍装置 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0147855A2 EP0147855A2 (fr) | 1985-07-10 |
EP0147855A3 EP0147855A3 (en) | 1986-06-11 |
EP0147855B1 true EP0147855B1 (fr) | 1989-10-11 |
Family
ID=17131963
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP84116379A Expired EP0147855B1 (fr) | 1983-12-28 | 1984-12-27 | Système frigorifique |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP0147855B1 (fr) |
JP (1) | JPS60140072A (fr) |
DE (1) | DE3480113D1 (fr) |
Families Citing this family (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS6329165A (ja) * | 1986-07-23 | 1988-02-06 | サンデン株式会社 | 冷凍サイクルの冷媒制御装置 |
DK125395A (da) * | 1995-11-10 | 1997-05-11 | Danfoss As | Køleanlæg og menbranventil til brug i anlægget |
GB2325723B (en) * | 1997-05-27 | 1999-06-02 | Matthew James Harold Rawlings | Improvements in control valves |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB165455A (en) * | 1917-09-11 | 1921-07-07 | Harry Egerton Wimperis | Viewing or sighting devices for use on aircraft |
US3785554A (en) * | 1970-09-25 | 1974-01-15 | Evans Mfg Co Jackes | Temperature responsive throttling valve |
Family Cites Families (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CH188957A (de) * | 1936-01-21 | 1937-01-31 | Sulzer Ag | Kompressionskältemaschine. |
US2326093A (en) * | 1940-05-29 | 1943-08-03 | Detroit Lubricator Co | Refrigerating system |
DE873394C (de) * | 1944-06-22 | 1953-04-13 | Siemens Ag | Kaeltemaschine |
JPS5740423B2 (fr) * | 1973-01-24 | 1982-08-27 | ||
US4081971A (en) * | 1976-09-17 | 1978-04-04 | The Trane Company | Air cooled centrifugal refrigeration machine with provision to prevent evaporator freezing |
US4136528A (en) * | 1977-01-13 | 1979-01-30 | Mcquay-Perfex Inc. | Refrigeration system subcooling control |
JPS58162458U (ja) * | 1982-04-22 | 1983-10-28 | 株式会社東芝 | 冷凍サイクル |
JPS59215552A (ja) * | 1983-05-23 | 1984-12-05 | 三菱電機株式会社 | 冷凍装置 |
-
1983
- 1983-12-28 JP JP58245324A patent/JPS60140072A/ja active Pending
-
1984
- 1984-12-27 EP EP84116379A patent/EP0147855B1/fr not_active Expired
- 1984-12-27 DE DE8484116379T patent/DE3480113D1/de not_active Expired
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
GB165455A (en) * | 1917-09-11 | 1921-07-07 | Harry Egerton Wimperis | Viewing or sighting devices for use on aircraft |
US3785554A (en) * | 1970-09-25 | 1974-01-15 | Evans Mfg Co Jackes | Temperature responsive throttling valve |
Also Published As
Publication number | Publication date |
---|---|
EP0147855A3 (en) | 1986-06-11 |
EP0147855A2 (fr) | 1985-07-10 |
DE3480113D1 (en) | 1989-11-16 |
JPS60140072A (ja) | 1985-07-24 |
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