WO2005061970A1 - 冷蔵庫 - Google Patents
冷蔵庫 Download PDFInfo
- Publication number
- WO2005061970A1 WO2005061970A1 PCT/JP2004/017761 JP2004017761W WO2005061970A1 WO 2005061970 A1 WO2005061970 A1 WO 2005061970A1 JP 2004017761 W JP2004017761 W JP 2004017761W WO 2005061970 A1 WO2005061970 A1 WO 2005061970A1
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- WO
- WIPO (PCT)
- Prior art keywords
- refrigeration
- compressor
- temperature
- cooler
- freezing
- 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.)
- Ceased
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Classifications
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D29/00—Arrangement or mounting of control or safety devices
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
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- 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
- F25B1/00—Compression machines, plants or systems with non-reversible cycle
- F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
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- 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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/02—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in parallel
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D11/00—Self-contained movable devices, e.g. domestic refrigerators
- F25D11/02—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures
- F25D11/022—Self-contained movable devices, e.g. domestic refrigerators with cooling compartments at different temperatures with two or more evaporators
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
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- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/13—Economisers
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- 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
- F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
- F25B2400/23—Separators
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- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/021—Inverters therefor
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- 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
- F25B2600/00—Control issues
- F25B2600/02—Compressor control
- F25B2600/025—Compressor control by controlling speed
- F25B2600/0253—Compressor control by controlling speed with variable speed
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- 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
- F25B2600/00—Control issues
- F25B2600/11—Fan speed control
- F25B2600/112—Fan speed control of evaporator fans
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- 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
- F25B2600/00—Control issues
- F25B2600/25—Control of valves
- F25B2600/2511—Evaporator distribution valves
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- 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
- F25B2700/00—Sensing or detecting of parameters; Sensors therefor
- F25B2700/17—Speeds
- F25B2700/173—Speeds of the evaporator fan
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- 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
- F25B5/00—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity
- F25B5/04—Compression machines, plants or systems, with several evaporator circuits, e.g. for varying refrigerating capacity arranged in series
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D17/00—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces
- F25D17/04—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection
- F25D17/06—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation
- F25D17/062—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators
- F25D17/065—Arrangements for circulating cooling fluids; Arrangements for circulating gas, e.g. air, within refrigerated spaces for circulating air, e.g. by convection by forced circulation in household refrigerators with compartments at different temperatures
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2317/00—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass
- F25D2317/06—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation
- F25D2317/068—Details or arrangements for circulating cooling fluids; Details or arrangements for circulating gas, e.g. air, within refrigerated spaces, not provided for in other groups of this subclass with forced air circulation characterised by the fans
- F25D2317/0682—Two or more fans
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2400/00—General features of, or devices for refrigerators, cold rooms, ice-boxes, or for cooling or freezing apparatus not covered by any other subclass
- F25D2400/04—Refrigerators with a horizontal mullion
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- 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
- F25D—REFRIGERATORS; COLD ROOMS; ICE-BOXES; COOLING OR FREEZING APPARATUS NOT OTHERWISE PROVIDED FOR
- F25D2700/00—Means for sensing or measuring; Sensors therefor
- F25D2700/12—Sensors measuring the inside temperature
- F25D2700/122—Sensors measuring the inside temperature of freezer compartments
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/70—Efficient control or regulation technologies, e.g. for control of refrigerant flow, motor or heating
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B40/00—Technologies aiming at improving the efficiency of home appliances, e.g. induction cooking or efficient technologies for refrigerators, freezers or dish washers
Definitions
- the present invention relates to a refrigerator using a two-stage compression type variable capacity compressor, and more particularly to a refrigerator that determines the number of revolutions of the compressor based on a storage space temperature.
- the force is reduced.
- Refrigerators that are widespread for home use include a freezing space that is cooled to about -18 to 20 ° C,
- the flow of the refrigerant to the coolers arranged in each of the cooling spaces is controlled by switching the flow path of the refrigerant, and the entire cooling space is controlled.
- the compressor is controlled according to the load such as the temperature and the temperature difference.
- the compressor used in refrigerators currently on the market is a so-called single-stage compression system in which a single compression section exists in a compressor case.
- a two-stage compressor (39) equipped with a motor, a low-stage compression element (39a) and a high-stage compression element (39b) is installed in
- An intermediate pressure expansion device (43) is connected to the outlet side of the condenser (40) connected to the discharge pipe (46), and the discharge side of the low-stage compression element (39a) and suction of the high-stage compression element (39b) Side and an intermediate pressure suction pipe (47), and an intermediate pressure evaporator (35) is connected between the intermediate pressure suction pipe (47) and the intermediate pressure expansion device (43).
- Patent Document 1 JP 2001-74325 A
- the cycle efficiency is improved by making the evaporation temperature of (35) higher than that of the low-pressure evaporator (34), which is a freezing cooler.
- the suction pipe of the refrigerating cooler (34) in the two-stage compression cycle is directly connected to the low-stage compression part (39a) of the compressor, and the suction pipe (47) of the refrigerating cooler (35) is Since it is connected to the intermediate pressure section of the compressor (39), the refrigeration capacity of the refrigeration space is less affected by the refrigerant flowing to the chiller (35).
- the rotation of the compressor (39) is controlled. As a result, the number of turns was reduced, and as a result, there was a problem that the cooling of the freezing space was insufficient.
- the present invention has been made in view of the above points, and by controlling a variable capacity refrigerating cycle having a two-stage compression type having a refrigerating and refrigerating cooler based on freezing space temperature information,
- An object of the present invention is to provide a refrigerator in which a freezing space and a refrigerated space can be appropriately controlled at respective storage temperatures.
- a refrigerator of the present invention includes a compressor having a variable compression capacity driven by an inverter, in which a compression element is configured by a low-stage compression section and a high-stage compression section; A switching valve that controls the flow rate together with the refrigerant flow path provided on the outlet side of the condenser that receives the discharged gas, and a refrigerating cooler and a refrigerating cooler that are connected to the switching valve via decompression devices, respectively.
- the number of rotations of the compressor is determined based on a freezing space temperature and a target value thereof.
- the refrigerator according to the second aspect of the present invention provides a compressor of variable capacity driven by an inverter in which a compression element is constituted by a low-stage compression section and a high-stage compression section, and discharge gas from the compressor.
- a refrigeration cycle is formed by a switching valve that controls the flow rate together with the refrigerant flow path provided on the outlet side of the receiving condenser, and a refrigeration cooler and a refrigeration cooler that are connected from the switching valve via decompression devices, respectively.
- the refrigerator determines the number of revolutions of the compressor based on the refrigeration space temperature and the target value together with the refrigeration space temperature and its target value. The feature is to increase the feedback amount of the feedback.
- both the refrigerating and refrigerating coolers are set to the evaporating temperature corresponding to the cooling of each storage space, and the efficiency of the refrigerating cycle is improved, and the flow of the refrigerant such as the flow switching to the respective coolers and the flow rate is controlled.
- Simultaneously cooling the freezing space and the refrigerated space which not only makes it possible to control, can suppress temperature fluctuations in each space and appropriately control the temperature of each space.
- the refrigerator main body (1) whose longitudinal section is shown in Fig. 2 forms a storage space inside the heat-insulating box, and the partition walls separate the freezing space in the freezing room and ice making room (2), and the refrigeration room and the vegetable room. It is divided into multiple storage rooms such as space (3).
- Each storage room is brought to a predetermined set temperature by a refrigerating cooler (4), a refrigerating cooler (5), and a cooling air circulation fan (6) (7) arranged for each freezing space or refrigerating space.
- Each of the coolers (4) and (5) is cooled by a refrigerant supplied from a compressor (9) installed in a machine room (8) at a lower rear portion of the main body.
- FIG. 1 shows a refrigeration cycle in the refrigerator of the present invention, wherein the compressor is
- the condenser (10) is formed in a flat plate shape and is disposed in the outer bottom space of the refrigerator body (1) in front of the machine room (8). (11) through the capillary tube ( 12) It is supplied to the refrigeration cooler (4) or the refrigeration cooler (5) via (13), and the evaporator cools the cooler by evaporating and stores it by circulation with the cool air fans (6) (7). The room is cooled to a predetermined air temperature, and the evaporated refrigerant is returned to the compressor (9) again through the accumulator (14).
- the compression element includes a low-stage compression unit (
- the reciprocating two-stage compressor is driven by the rotation of the rotating shaft (9e) of the electric mechanism (9d) housed in the sealed case (9c).
- the connecting rod (9g) is reciprocated by the eccentric shaft (9f) that rotates eccentrically.
- a piston (9i) is fitted and fixed to the tip of the connecting rod (9g) by a ball joint (9h), and the reciprocating motion of the piston (9i) in the cylinder (9j) causes the low-stage side compression section (9a) to move. ) And the high-stage side compression section (9b) alternately sucks, compresses, and discharges the refrigerant.
- the use of a ball joint (9h) in the compression section improves volumetric efficiency. The expansion of the external space of the two-stage compressor (9) that requires the compression units (9a) and (9b) is suppressed.
- a discharge port (9m) for discharging compressed refrigerant gas is opened in the case (9c), and a discharge port (9n) of the high-stage compression section (9b) is discharged to the condenser (10).
- tube (16) Connected to tube (16).
- the accumulator (14) separates gas-liquid, stores the liquid refrigerant that has not been completely evaporated in the cooler (4), and sends out only the gaseous refrigerant, and the cylinder (9j) of the compressor (9). In this embodiment, it is provided only in the subsequent stage of the refrigerating cooler (4).
- the suction pipe (17) from the refrigerator cooler (5) is connected so as to be introduced into a space at an intermediate pressure in the closed case (9c). Therefore, since the suction refrigerant from the refrigerator (5) does not flow directly into the cylinder of the compressor, it is not necessary to provide an accumulator at the subsequent stage of the refrigerator (5). It is good.
- the refrigerant gas sucked and drawn in from the suction pipe (17) on the side of the refrigerator cooler communicates with the refrigerant gas discharged from the discharge port (9m) of the low-stage compression section (9a).
- the suction port (9p) of the high-stage compression section (9b) is configured to be sucked, inserted, and compressed.
- the capacity of the compressor (9) is variable by inverter control.
- the compressor (9) is operated at a temperature of 30 to 70 Hz based on a difference between a detected temperature of the freezing and refrigerated space, a target set temperature, a temperature change rate, and the like. Determines the rotation frequency, and is driven by a control device such as a microcomputer.
- the switching valve (11) is provided on the outlet side of the condenser (10) that receives the gas discharged from the compressor (9), and switches the refrigerant flow path to the coolers (4) and (5).
- the valve port A (19a) to the refrigerating cooler (4) and the valve to the refrigerating cooler (5) are installed.
- This is a three-way valve in which a valve seat (19) having a port B (19b) is provided, and a valve element (20) is arranged above the valve seat (19).
- the valve element (20) extends in an arc shape over a predetermined length so as to correspond to the valve ports A (19a) and B (19b) on the rotation trajectory, respectively.
- V-shaped concave groove A (20a) and concave groove B (20b) are formed on the lower surface of the thick step (20d), which is formed into a predetermined edge shape, at two locations with different rotational movement radii from the center.
- the upper surface of the valve seat (19) and the valve body (20) are closely overlapped with each other, and are rotationally driven in 0-85 pulse steps by a stepping motor (not shown) provided on the upper side.
- the switching valve (11) rotates the valve element (20) with a pulse signal according to a refrigeration cycle control signal, and at a predetermined pulse position, engages the concave groove A (20a) outside the rotation radius of the valve element with the valve.
- the port A (19a) and the port A (19a) overlap and communicate with each other, the refrigerant flowing into the valve case (18) from the inlet valve port (21) flows into the thick step (20d) of the concave groove A (20a).
- Open edge force enters the V-shaped groove A (20a), flows out from the valve port A (19a) communicating with the groove A, is introduced into the freezing capillary (12), and is frozen. It evaporates and evaporates in the cooler (4).
- the concave groove B (20b) on the refrigeration side has a V-shaped groove such that its cross-sectional area is enlarged as needed according to the directional force from the rotation end to the open end of the thick step (20d).
- the valve element (20) rotates, it has a minimum to maximum flow opening area and communicates with the valve port B (19b). Because it can be controlled, the pulse , The flow rate of the refrigerant can be efficiently and linearly changed.
- the opening of the valves is controlled by fully opening or completely closing the valves (19a) and (19b) to the refrigerating cooler (4) and the refrigerating-side cooler (5).
- a variety of patterns can be selected, such as squeezing the refrigeration side valve opening to fully open the refrigeration side, or squeezing the refrigeration side valve opening to fully open the refrigeration side.
- (4) and the refrigerator cooler (5) are connected in parallel, and there are two types of cooling control: simultaneous cooling on the freezing side and cooling only on the freezing side.
- the refrigerant flowing out of the freezing-side valve port A (19a) passes through a capillary tube (12) set to have an evaporation temperature corresponding to the cooling temperature in the freezing space (2), and is decompressed and cooled. In 4), it evaporates at about -25 ° C, and the evaporation temperature from the refrigeration valve B (19b) becomes about 15 ° C, which is similar to the cooling temperature in the refrigerated space (3).
- the refrigerant is sent to the refrigerator for cooling (5) through the capillary for cooling (13) set as described above, and evaporates.
- the capillaries for refrigeration and refrigeration (12) and (13) in the refrigeration cycle have a difference in refrigerant evaporation temperature between the refrigeration cooler (4) and the refrigeration cooler (5).
- the capillary on the freezing side (12) when the refrigerant flows to both the freezing and refrigeration as described above, it tends to flow easily to the refrigerated side, which has low resistance, and tends to be less likely to flow to the freezing side. In extreme cases, a situation occurs in which the refrigerant does not flow to the freezing side.
- the switching valve (11) controls the refrigerant flow for each cooling of the freezing and refrigerating spaces (2) and (3), and prevents the so-called one-sided flow of the refrigerant. In addition, control is added to slightly reduce the flow rate of refrigerant to the refrigeration side.
- the freezing side cooler (4) is hardly affected by the refrigerant flow state on the refrigerated side.
- the refrigerating capacity on the refrigeration side also changes from the closed state to the open state due to the communication between the concave groove B (20b) of the switching valve (11) and the valve port (19b).
- the number of rotations of the compressor (9) can be varied to control the power.
- the evaporation temperature of the refrigerator (5) can be increased by increasing the temperature difference from the freezing side, and the refrigerated room temperature can be cooled to 11 to 2 ° C. Power Increase the heat transfer surface area of the refrigeration cooler (5) to increase the amount of heat exchange for refrigeration space cooling. In this case, the evaporation temperature can be further increased. In this case, the temperature difference between the cooling temperature of the refrigeration space (3) and the chiller temperature becomes smaller, and the frost adhering to the refrigeration cooler (5) becomes smaller. The effect is to keep the humidity inside the refrigerator high by preventing drying in the space.
- the heat transfer surface area of the refrigerating cooler (5) is determined by the refrigerating cooler. By making it equal to or larger than (4), each cooling space can be cooled efficiently.
- the compressor (9) When the compressor (9) is driven by turning on the power, the compressed and high-temperature and high-pressure refrigerant gas is discharged from the discharge pipe (16) to the condenser (10) and reaches the switching valve (11).
- the switching valve (11) can be set in various patterns as described above. However, when the power is turned on, the freezing and refrigerating spaces (2) and (3) are in an uncooled state. A (19a) and B (19b) are fully opened, and the refrigerant flows into the freezing and chilling capillaries (12) (13) and is decompressed and sent to the freezing and chilling coolers (4) and (5) respectively. It flows in and evaporates at each evaporation temperature, and cools each cooler to a predetermined temperature.
- the refrigerant from the refrigerating cooler (4) flows into the accumulator (14), and if liquid refrigerant that could not be evaporated in the cooler remains, it is stored inside the accumulator (14). Only gas refrigerant is sucked into the low-stage compression section (9a) of the suction pipe (15) force compressor (9). The refrigerant evaporated in the refrigerating cooler (5) is introduced into a closed case (9c) having an intermediate pressure of the compressor (9) via a suction pipe (17).
- the refrigerant gas is drawn from the refrigerating cooler (4) into the low-stage side compression section (9a), compressed, discharged and discharged (9m), and discharged into the force case (9c).
- Refrigerant gas flowing into the intermediate pressure section of the sealed case (9c) from the vessel (5) merges with the refrigerant gas, is sucked into the high-stage compression section (9b) from the suction port (9p), is compressed, and is discharged through the discharge port (9n)
- a refrigeration cycle that is discharged to the discharge pipe (16) and guided to the condenser (10).
- the capillaries (12) and (13) are provided so that the evaporation temperature matches the set temperature of the refrigeration space (2) and the refrigeration space (3).
- Refrigeration coolers (4) and (5) are installed, and the refrigerant gas evaporated in the refrigeration cooler (5) is directly transferred to the intermediate pressure in the compressor case (9c) at an intermediate pressure higher than the freezing side.
- the pressure section By sucking in, the evaporating temperature of the refrigeration cooler (5) can be set higher than that of the refrigeration cooler (4) in accordance with the indoor cooling temperature. And power consumption can be reduced.
- the refrigeration cycle includes the compressor (9), the condenser (10), and the refrigerant flow switching valve (11).
- the refrigeration cooler (4) and the refrigeration cooler (5) are connected in series, and the switching valve (11) bypasses the refrigeration capillary (13) and the refrigeration cooler (5).
- the conduit (22) is connected from the freezing capillary (12) to the freezing cooler (4) via the gas-liquid separator (23), and the upper part of the gas-liquid separator (23) and the compressor (9) are connected.
- the refrigerant flows to the refrigeration cooler (5) and the refrigeration cooler (4) simultaneously or selectively by the switching valve (11) controlled in the same manner as described above.
- the refrigerant from the bypass pipe (22) or the refrigeration cooler (5) is separated into a gaseous refrigerant and a liquid refrigerant in the gas-liquid separator (23), and the liquid refrigerant is cooled by the refrigeration cooler (4).
- the gaseous refrigerant flows to the side, and returns to the intermediate pressure section of the compressor (9) through the refrigeration-side suction pipe (24), and the liquid refrigerant evaporates again at a low temperature in the refrigeration cooler (4) and is compressed. It returns to the lower stage side of the machine (9), and has the effect of cooling each storage room to a predetermined temperature according to the cycle efficiency as in the above-described embodiment.
- FIG. 6 shows a state where the evaporation temperature of the refrigerating cooler (4) and the refrigerating cooler (5) and the condensing temperature of the condenser (10) are constant values, and the compressor (9 ) Shows the refrigerating capacity between the freezing side and the refrigerating side during operation, with the vertical axis representing the refrigerating capacity on the refrigerating side and the horizontal axis representing the refrigerating capacity on the freezing side.
- point a shows the case where the refrigerant flows only through the refrigeration side cooler (5) by the switching valve
- point b when the refrigerant flows only through the freezing side cooler (4)
- point c This shows a case where the refrigerant flows into both of the cooling units (4) and (5) with the valve openings (19a) and (19b) fully opened.
- the mass or volume of the refrigerant directly drawn into the low-stage compression section (9a) of the compressor (9) from the refrigerating cooler (4) is determined by the cylinder displacement of the low-stage compression section.
- the corresponding refrigeration power is 69 W for the freezing side only flow, and 64 W for the freezing and refrigeration simultaneous flow, and the refrigeration cooler (5) to the compressor (9) It is almost constant without being affected by the refrigerant returning to the intermediate pressure section.
- the refrigeration power corresponding to the amount of refrigerant sucked into the compressor (9) from the refrigeration cooler (5) is 155 W when the refrigeration side alone is used.
- the refrigeration capacity on the refrigeration side is reduced by about 75 W, and the refrigerant capacity is limited by the presence or absence of the refrigerant drawn from the refrigeration cooler (4), that is, only the refrigerant from the refrigeration cooler (5). Or the combined flow rate with the refrigerant sucked from the refrigerating cooler (4).
- the indoor temperature of the refrigerated space is + 3-5 ° C, while the temperature of the refrigerated space is 18-1-20 ° C.
- the refrigeration capacity required for cooling the space is larger than the value required for the refrigerated space.
- the cooling control of the refrigerating space depends on the rotational speed of the compressor (9).
- insufficient cooling that can be controlled, increase the refrigerating power by increasing the number of revolutions of the compressor (9), as indicated by the arrow, and in the case of excessive cooling, reduce or stop the number of revolutions to cool.
- the temperature can be properly maintained.
- the cooling temperature is controlled by adjusting the flow rate of the refrigerant by controlling the opening and closing of the valve opening of the switching valve (11), which is different from the rotation speed of the compressor (9).
- FIG. 8 is a control block diagram.
- the freezing space detected by the cold temperature sensor for example, the indoor temperature (Fa) of the freezing room (4) is compared with a predetermined target value (Fr), and the deviation is used as a PID controller (Fr) for determining the frequency of the compressor. Entered in 25).
- the PID calculation value increases due to the deviation, and the rotation speed of the compressor (9) is increased by a predetermined amount, whereby the freezing space (2) is increased.
- the operation is controlled so as to promote cooling and bring the temperature to a predetermined level.
- the rotation speed is reduced or stopped to lower the refrigerating power.
- the rotation speed of the compressor (9) is controlled by the temperature information of the freezing space (2).
- the refrigerated space (3) may be different from the freezing space (2). It is also assumed that the refrigeration capacity of these will be insufficient.
- the rotation speed of the compressor (9) is determined based on the refrigeration side based on the temperature information fed back to the refrigeration space (2), which is a deviation value considered larger than the actual value.
- the flow of refrigerant to the chiller (5) by the switching valve (11) can be controlled without increasing the rotation speed of the compressor (9).
- the refrigeration side is increased or decreased to control the refrigeration side to an appropriate temperature without causing overcooling on the refrigeration side.
- the case where the rotation speed of the compressor (9) is determined in consideration of the temperature information of the refrigerated space (3) has been described. 3) If the temperature drops below the target value (Rr), the feedback signal decreases the number of rotations of the compressor (9), and as a result, the refrigeration capacity of the refrigeration space (2) decreases. Problems occur.
- FIG. 10 is a block diagram corresponding to such an emergency, and a function (Fx) for feeding back temperature information only when the temperature of the refrigerated space (3) is higher than the target value (Rr). If the difference between the refrigerated space temperature (Ra) and the target value (Rr) is small, the value is input. If the value is negative, a zero signal is input to the PID controller (25). To do.
- the refrigerated space (2) uses the refrigeration power based on the temperature information to obtain the target value. (Fr), and can prevent the temperature of the refrigeration space (2) from becoming higher than the target value (Fr) due to a decrease in refrigeration power.
- Figure 11 shows the refrigerating cycle and the refrigerating cycle when the compressor (9) is driven at a certain rotation speed and the temperature of the refrigerating cooler (5) is changed under the condition that the condensing temperature is constant. It shows the change of ability (QF1) (QR1).
- the refrigerating cooler (5) is capable of reducing its refrigerating capacity (Q R1) by lowering its surface temperature and increasing its capacity by raising it.
- the refrigerating capacity (QF1) is constant at a cooler temperature of, for example, -23.5 ° C, and it is found that the refrigerating capacity is not significantly affected by the fluctuation of the refrigerating capacity on the refrigeration side.
- the number of heat exchanges in the chiller (5) decreases when the number of revolutions of the chiller fan (7) is changed, for example, when the number of revolutions is reduced.
- the refrigeration capacity (QR1) of the refrigeration cycle decreases as a result of the decrease in the surface temperature of the cooler (5).
- increasing the rotation speed of the fan (7) increases the heat exchange rate.
- the surface temperature of the cooler (5) rises, and the refrigeration capacity (QR1) of the cycle increases.
- the space temperature can be controlled by increasing or decreasing the rotation speed of the refrigeration fan (7), and the refrigerated space temperature (Ra) is the target. If it is higher than the value (Rr), it can be cooled by increasing the rotation speed of the refrigeration side cooling fan (7), If it is supercooled below the target value (Rr), the refrigerating power can be reduced by lowering the fan speed to control it to a predetermined appropriate temperature.
- FIG. 12 shows the change in the refrigerating capacity (QF2) (QR2) of the refrigerating cycle and the refrigerating cycle when the temperature of the refrigerating cooler (4) is changed.
- QF2 refrigerating capacity
- the refrigeration side cooling fan Reducing the number of rotations of (6), reducing the amount of heat exchange in the refrigerating cooler (4), and lowering the surface temperature of the cooler (4), thereby increasing the refrigeration cycle capacity (QR2)
- the cooling capacity of the refrigeration side (QF2) can be reduced to control each cooling space to an appropriate temperature.
- the refrigerant flows to the refrigeration cooler (5) at the same time as the refrigerant flows to the refrigeration cooler (4) to raise the evaporation temperature. Because of this, it is possible to efficiently cool the cooling space, and to distribute the amount of refrigerant accurately by the refrigerant flow control switching valve (11), which is a three-way valve, even if the temperature load is applied to each storage space as needed. In addition, it is possible to appropriately control the temperature of each space by suppressing the temperature fluctuation of the refrigerated space.
- the refrigerant flow to the refrigeration and refrigeration coolers (4) and (5) can be controlled at the same time. Therefore, the amount of the refrigerant required for the refrigeration cycle in which the refrigerant is not biased to one of the coolers does not increase more than necessary. Therefore, even when a flammable refrigerant such as a hydrocarbon-based refrigerant is employed, the amount of refrigerant to be charged can be reduced, thereby improving safety.
- the two-stage compressor (9) in the above embodiment has been described by using the pressure in the compressor case (9c) as an intermediate pressure.
- the present invention is not limited to this.
- the suction pipe of the cooler power is connected to the space inside the compressor case, and the suction pipe of the cooler power is connected to the connection between the discharge port of the lower compression section and the suction port of the higher compression section. You can do it.
- the suction pipe from the refrigeration cooler is connected to the suction port of the low-stage compression section, and the suction pipe from the refrigeration cooler is connected to the discharge port of the low-stage compression section and the high-stage compression section. It may be connected to the connection part of the side compression part to the suction port, and discharge the discharge gas of the high-stage side compression part to the discharge pipe to the condenser inside the high-pressure case.
- a two-stage compression refrigeration cycle configuration can be used for a refrigerator with improved cycle efficiency.
- FIG. 1 is a refrigeration cycle diagram of a refrigerator showing one embodiment of the present invention.
- FIG. 2 is a schematic longitudinal sectional view of a refrigerator equipped with the refrigeration cycle of FIG. 1.
- FIG. 3 is a longitudinal sectional view showing details of a two-stage compressor in FIG. 1.
- FIG. 4 is a plan view showing details of a main part of a three-way valve in FIG. 1.
- FIG. 5 is a configuration diagram showing another embodiment of a refrigeration cycle.
- FIG. 6 is a graph showing the relationship between refrigeration and refrigeration side refrigeration capacity and refrigerant flow.
- FIG. 7 is a schematic diagram of FIG. 6.
- FIG. 8 is a block diagram of compressor speed control.
- FIG. 9 is a rotation speed control block diagram obtained by adding refrigeration temperature information to the control of FIG. 8.
- FIG. 10 is a rotation speed control block diagram obtained by further improving the control of FIG. 9.
- FIG. 11 is an explanatory diagram showing changes in refrigeration and refrigeration capacity when the temperature of the refrigerator for cooling according to the present invention is changed.
- FIG. 12 is an explanatory diagram showing changes in refrigeration and refrigerating refrigeration capacity when the temperature of the freezing cooler of the present invention is changed.
- FIG. 13 is a refrigeration cycle diagram of a conventional refrigerator.
- Switching valve 12 Capillary tube for refrigeration 13 Capillary tube for refrigeration Accumulator 15 Refrigeration-side suction pipe 16 Discharge pipe, 24 Refrigeration-side suction pipe 18 Valve case 19 Valve seat a Refrigeration-side valve port A 19b Refrigeration-side valve port B 20 Valve body
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- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Mechanical Engineering (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Devices That Are Associated With Refrigeration Equipment (AREA)
Abstract
Description
Claims
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US10/584,205 US20070144190A1 (en) | 2003-12-24 | 2004-11-30 | Refrigerator |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2003427845A JP2005188783A (ja) | 2003-12-24 | 2003-12-24 | 冷蔵庫 |
| JP2003-427845 | 2003-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2005061970A1 true WO2005061970A1 (ja) | 2005-07-07 |
Family
ID=34708912
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/JP2004/017761 Ceased WO2005061970A1 (ja) | 2003-12-24 | 2004-11-30 | 冷蔵庫 |
Country Status (6)
| Country | Link |
|---|---|
| US (1) | US20070144190A1 (ja) |
| JP (1) | JP2005188783A (ja) |
| KR (1) | KR20060132869A (ja) |
| CN (1) | CN100417876C (ja) |
| TW (1) | TWI257472B (ja) |
| WO (1) | WO2005061970A1 (ja) |
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- 2004-11-30 CN CNB2004800387606A patent/CN100417876C/zh not_active Expired - Fee Related
- 2004-11-30 KR KR1020067014363A patent/KR20060132869A/ko not_active Withdrawn
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Also Published As
| Publication number | Publication date |
|---|---|
| TW200526912A (en) | 2005-08-16 |
| CN100417876C (zh) | 2008-09-10 |
| US20070144190A1 (en) | 2007-06-28 |
| JP2005188783A (ja) | 2005-07-14 |
| KR20060132869A (ko) | 2006-12-22 |
| CN1898505A (zh) | 2007-01-17 |
| TWI257472B (en) | 2006-07-01 |
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