WO2007132804A1 - 冷凍装置 - Google Patents
冷凍装置 Download PDFInfo
- Publication number
- WO2007132804A1 WO2007132804A1 PCT/JP2007/059845 JP2007059845W WO2007132804A1 WO 2007132804 A1 WO2007132804 A1 WO 2007132804A1 JP 2007059845 W JP2007059845 W JP 2007059845W WO 2007132804 A1 WO2007132804 A1 WO 2007132804A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- refrigerant
- heat exchanger
- heat insulating
- compressor
- refrigerant circuit
- Prior art date
Links
- 238000005057 refrigeration Methods 0.000 title claims abstract description 88
- 239000003507 refrigerant Substances 0.000 claims abstract description 255
- 238000009413 insulation Methods 0.000 claims abstract description 88
- 238000003860 storage Methods 0.000 claims abstract description 49
- 239000012774 insulation material Substances 0.000 claims abstract description 5
- 238000009835 boiling Methods 0.000 claims description 33
- 239000011810 insulating material Substances 0.000 claims description 31
- 238000001816 cooling Methods 0.000 claims description 23
- 230000006837 decompression Effects 0.000 claims description 20
- 238000002156 mixing Methods 0.000 claims description 5
- 239000002131 composite material Substances 0.000 claims description 3
- 239000006260 foam Substances 0.000 claims description 3
- 238000001704 evaporation Methods 0.000 abstract description 31
- 230000008020 evaporation Effects 0.000 abstract description 28
- 238000009833 condensation Methods 0.000 abstract description 5
- 230000005494 condensation Effects 0.000 abstract description 5
- 239000007788 liquid Substances 0.000 description 27
- 239000003921 oil Substances 0.000 description 22
- 239000012071 phase Substances 0.000 description 22
- 238000005259 measurement Methods 0.000 description 21
- 238000009434 installation Methods 0.000 description 14
- MSSNHSVIGIHOJA-UHFFFAOYSA-N pentafluoropropane Chemical compound FC(F)CC(F)(F)F MSSNHSVIGIHOJA-UHFFFAOYSA-N 0.000 description 14
- OFBQJSOFQDEBGM-UHFFFAOYSA-N Pentane Chemical compound CCCCC OFBQJSOFQDEBGM-UHFFFAOYSA-N 0.000 description 13
- 239000000203 mixture Substances 0.000 description 11
- 239000007791 liquid phase Substances 0.000 description 9
- 238000005192 partition Methods 0.000 description 7
- 230000000694 effects Effects 0.000 description 5
- 238000012423 maintenance Methods 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000004880 explosion Methods 0.000 description 3
- 238000005187 foaming Methods 0.000 description 3
- 239000007789 gas Substances 0.000 description 3
- 239000011491 glass wool Substances 0.000 description 3
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 2
- XPDWGBQVDMORPB-UHFFFAOYSA-N Fluoroform Chemical compound FC(F)F XPDWGBQVDMORPB-UHFFFAOYSA-N 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- RWRIWBAIICGTTQ-UHFFFAOYSA-N difluoromethane Chemical compound FCF RWRIWBAIICGTTQ-UHFFFAOYSA-N 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 239000010687 lubricating oil Substances 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- GTLACDSXYULKMZ-UHFFFAOYSA-N pentafluoroethane Chemical compound FC(F)C(F)(F)F GTLACDSXYULKMZ-UHFFFAOYSA-N 0.000 description 2
- 230000002093 peripheral effect Effects 0.000 description 2
- 229920005749 polyurethane resin Polymers 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 229920003002 synthetic resin Polymers 0.000 description 2
- 239000000057 synthetic resin Substances 0.000 description 2
- TXEYQDLBPFQVAA-UHFFFAOYSA-N tetrafluoromethane Chemical group FC(F)(F)F TXEYQDLBPFQVAA-UHFFFAOYSA-N 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000004308 accommodation Effects 0.000 description 1
- 239000002390 adhesive tape Substances 0.000 description 1
- 229910052786 argon Inorganic materials 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 239000001273 butane Substances 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 239000003638 chemical reducing agent Substances 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- WMIYKQLTONQJES-UHFFFAOYSA-N hexafluoroethane Chemical compound FC(F)(F)C(F)(F)F WMIYKQLTONQJES-UHFFFAOYSA-N 0.000 description 1
- 238000011065 in-situ storage Methods 0.000 description 1
- 239000000314 lubricant Substances 0.000 description 1
- 238000005461 lubrication Methods 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 244000005700 microbiome Species 0.000 description 1
- 239000003595 mist Substances 0.000 description 1
- IJDNQMDRQITEOD-UHFFFAOYSA-N n-butane Chemical compound CCCC IJDNQMDRQITEOD-UHFFFAOYSA-N 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 238000012856 packing Methods 0.000 description 1
- 239000004071 soot Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000009834 vaporization Methods 0.000 description 1
- 230000008016 vaporization Effects 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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
- F25D19/00—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors
-
- 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
- F25D19/02—Arrangement or mounting of refrigeration units with respect to devices or objects to be refrigerated, e.g. infrared detectors plug-in type
-
- 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
- F25B7/00—Compression machines, plants or systems, with cascade operation, i.e. with two or more circuits, the heat from the condenser of one circuit being absorbed by the evaporator of the next circuit
-
- 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
- F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
- F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
- F25B9/006—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant the refrigerant containing more than one component
Definitions
- the present invention includes a high-temperature side refrigerant circuit and a low-temperature side refrigerant circuit that constitute an independent refrigerant closed circuit that condenses and evaporates the refrigerant discharged from the compressor and thereby exhibits a cooling action.
- a cascade heat exchanger is composed of the evaporator of the low-temperature side refrigerant circuit and the condenser of the low-temperature side refrigerant circuit, and the storage chamber configured in the heat insulation box is cooled to ultra-low temperature by the evaporator of the low-temperature side refrigerant circuit.
- the present invention relates to a refrigeration apparatus.
- FIG. 10 shows a refrigerant circuit diagram of the refrigeration apparatus 135 using the binary refrigeration apparatus.
- the refrigerant circuit 100 includes a high temperature side refrigeration cycle 101 and a low temperature side refrigeration cycle 102.
- the discharge side pipe 103D of the compressor 103 constituting the high temperature side refrigeration cycle 101 is connected to the auxiliary condenser 105, and the auxiliary condenser 105 is connected to the frame pipe 104 (refer to the frame pipe 27 of this application for the frame pipe). After being connected, it is connected to the condenser 107 through the oil cooler 106 of the compressor 103.
- the condenser 107 is cooled by a condenser fan 116.
- the outlet-side refrigerant pipe of the condenser 107 is connected to an evaporator 110 as an evaporator part constituting the evaporator via a dryer 108 and a decompressor 109 in order.
- An accumulator 111 is connected to the outlet-side refrigerant pipe of the evaporator 110, and the refrigerant pipe exiting the accumulator 111 is connected to the suction-side pipe 103 S of the compressor 103.
- an oil separator 114 is connected to the discharge side pipe 113D of the compressor 113 constituting the low temperature side refrigeration cycle 102, and the refrigerant pipe connected to the outlet side of the oil separator 114 is It is connected to a condensing pipe 115 as a high temperature side pipe inserted into the evaporator 110.
- the condensing pipe 115 and the evaporator 110 constitute a cascade heat exchange 130.
- the discharge pipe connected to the outlet side of the condensing pipe 115 passes through the dryer 131.
- the gas-phase refrigerant that is connected to the gas-liquid separator 116 and separated by the gas-liquid separator 116 passes through the first intermediate heat exchanger 117 via the gas-phase piping, and passes through the second intermediate heat exchanger 117. It flows into the gas-liquid separator 11 8.
- the liquid-phase refrigerant separated by the gas-liquid separator 116 flows into the first intermediate heat exchanger 117 through the dryer 119 and the decompressor 120 via the liquid-phase piping, and evaporates the gas-phase refrigerant. It is cooling.
- the liquid-phase refrigerant separated by the second gas-liquid separator 118 passes through the dryer 121 through the liquid-phase piping and then flows into the second intermediate heat exchanger 123 via the decompressor 122.
- the gas-phase refrigerant separated by the second gas-liquid separator 1 18 passes through the second intermediate heat exchanger 123 through the gas-phase piping and passes through the third intermediate heat exchanger 124. Further, it flows into the decompressor 126 through the dryer 125.
- the pressure reducer 126 is connected to an evaporation nove 127 as an evaporator, which is exchanged on the inner wall of the heat insulation box 132 of the refrigeration apparatus, and the evaporation pipe 127 is connected to the third intermediate heat exchange. Connected to 124.
- the third intermediate heat exchanger 124 is connected to the second and first intermediate heat exchangers one after another, and is then connected to the suction-side piping 113S of the compressor 113.
- An expansion tank 128 that stores refrigerant when the compressor 113 is stopped is connected to the suction side pipe 113S via a decompressor 129.
- the cascade heat exchanger 130 is provided on the back surface of the heat insulation box 132 constituting the main body of the refrigeration apparatus 135.
- a storage recess 133 that opens to the outside secured in advance is formed and incorporated after foaming the heat insulating material of the heat insulating box 132 (see Patent Document 1).
- a heat insulating material is located on the peripheral surface of the cascade heat exchanger 130, and a gap between the storage recess 133 and the cascade heat exchange 130 is received, and a flat plate heat insulating material is provided. It is covered by 134 so as to block the whole opening!
- Patent Document 1 JP 2000-105047 A
- the heat insulating material covering the back surface of the cascade heat exchanger is covered with the inner cover, and the second heat insulating material and the second heat insulating material are covered outside the inner cover.
- An outer cover is provided, and the outer cover is detachably attached to the inner cover with a plurality of screws.
- the overhanging portion still exists on the back surface of the main body at the installation location. Even in such a case, the thickness of the overhanging portion is reduced over the entire main body. There was a problem that the storage capacity became narrow with respect to the depth as the external dimension by adopting the product design secured across. In addition, after installation, it is necessary to perform the work of attaching the outer cover, and there is a problem that the carrying-in work becomes complicated.
- the present invention has been made to solve the conventional technical problem, and is a refrigeration apparatus including a cascade heat exchanger, which is a heat insulation for covering the cascade heat exchanger.
- a refrigeration apparatus that can reduce the depth dimension of the apparatus itself without being affected by the thickness dimension of the material and can be easily carried in from a normal carry-in port.
- the refrigeration apparatus of the present invention condenses and evaporates the refrigerant discharged from the compressor, respectively.
- the storage chamber configured in the heat insulation box is cooled to an ultra-low temperature by the evaporator of the low temperature side refrigerant circuit, and the compressor is installed on the side of the heat insulation box. Characterized in that a heat insulating structure is provided on the side wall of the heat insulating box body on the machine room side.
- the refrigeration apparatus of the invention of claim 2 includes a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers connected in series so that a return cooling medium from the evaporator flows, and a plurality of pressure reducing apparatuses. Multiple types of non-azeotropic refrigerant mixture are enclosed, and the condensed refrigerant in the refrigerant that has passed through the condenser is joined to the intermediate heat exchanger via the decompression device, and the intermediate heat exchanger uses the intermediate heat exchanger to condense the uncondensed refrigerant.
- the lower-boiling point refrigerant By cooling the refrigerant, the lower-boiling point refrigerant is condensed sequentially, and the lowest-boiling point refrigerant flows into the evaporator via the final-stage decompression device.
- Insulated by a heat insulation box that has a machine room that is constructed on the side of the heat insulation box and is equipped with a compressor. The structure is arranged on the side wall on the machine room side of the heat insulating box.
- the refrigeration apparatus includes a high-temperature side refrigerant circuit and a low-temperature side refrigerant circuit that constitute an independent refrigerant closed circuit that condenses and evaporates the refrigerant discharged from the compressor force and exhibits a cooling action.
- the low-temperature side refrigerant circuit includes a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers connected in series so that a return refrigerant from the evaporator flows, and a plurality of decompression devices.
- a plurality of types of non-azeotropic refrigerant mixtures are enclosed, and the condensed refrigerant in the refrigerant that has passed through the condenser is joined to the intermediate heat exchanger via the decompression device, and the intermediate heat exchanger uses the uncondensed refrigerant in the refrigerant Then, the refrigerant having a lower boiling point is condensed sequentially, and the refrigerant having the lowest boiling point is introduced into the evaporator via the decompressor in the final stage, and the evaporator of the high-temperature side refrigerant circuit and the low-temperature side refrigerant circuit are connected.
- a cascade heat exchanger is configured with the condenser, and the low temperature side refrigerant
- a refrigeration system that cools a storage room configured in a heat insulation box with a circuit evaporator to an ultra-low temperature, is equipped with a machine room that is configured on the side of the heat insulation box and has a compressor installed. Insulation that surrounds the heat exchanger and each intermediate heat exchanger with heat insulating material The thermal structure is disposed on the side wall on the machine room side of the heat insulating box.
- the heat insulating box is formed by a composite structure of a vacuum heat insulating panel and a foam heat insulating material, and the vacuum heat insulating panel is attached to the heat insulating box. It is arranged in the side wall opposite to the front and rear walls and the machine room.
- the refrigeration apparatus of the invention of claim 5 is characterized in that, in each of the above inventions, the heat insulating structure can be inserted / removed from the rear, front, or top.
- the refrigeration apparatus of the invention of claim 6 is characterized in that, in the above invention, the piping of the heat insulating structure internal force faces the surface in the direction in which the heat insulating structure is inserted and removed.
- a high-temperature side refrigerant circuit and a low-temperature side refrigerant circuit that constitute an independent refrigerant closed circuit that exhibits a cooling action by condensing and evaporating the refrigerant discharged from the compressor
- a cascade heat exchanger is composed of the evaporator of the high-temperature side refrigerant circuit and the condenser of the low-temperature side refrigerant circuit, and the storage chamber configured in the heat insulation box is cooled to ultra-low temperature by the evaporator of the low-temperature side refrigerant circuit.
- the refrigeration system has a machine room that is configured on the side of the heat insulation box and is equipped with a compressor, etc., and has a heat insulation structure that surrounds the cascade heat exchanger with heat insulation. Because it is arranged on the side wall on the machine room side of the heat insulation box, it is possible to reduce the depth of the entire device compared to the case where a cascade heat exchanger is installed on the back of the heat insulation box as in the past. It becomes.
- a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers connected in series so that a return refrigerant from the evaporator flows, and a plurality of pressure reducing devices are provided.
- It is equipped with a machine room that is constructed on the side of the heat insulation box and is equipped with a compressor, etc., and insulates the heat insulation structure that surrounds each intermediate heat exchanger ⁇ with a heat insulating material. Since it is arranged on the side wall of the machine body side of the box body, it is compared with the case where a heat insulating structure that surrounds each intermediate heat exchanger with a heat insulating material is installed on the back of the heat insulating box body as in the past. Thus, it becomes possible to reduce the depth dimension of the entire apparatus.
- the high-temperature side refrigerant circuit and the low-temperature side refrigerant circuit that constitute independent refrigerant closed circuits that exhibit the cooling action by condensing and evaporating the refrigerant discharged from the compressor, respectively.
- the low-temperature-side refrigerant circuit has a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers connected in series so that a return refrigerant from the evaporator flows, and a plurality of decompression devices.
- a plurality of types of non-azeotropic refrigerant mixtures are enclosed, and condensed refrigerant in the refrigerant that has passed through the condenser is joined to the intermediate heat exchanger via the decompression device, and uncondensed refrigerant in the refrigerant is removed by the intermediate heat exchanger.
- the lower boiling point refrigerant is condensed sequentially, and the lowest boiling point refrigerant is allowed to flow into the evaporator via the final-stage depressurizer, and the evaporator of the high temperature side refrigerant circuit and the low temperature side refrigerant circuit are condensed.
- a cascade heat exchanger In the refrigeration system that cools the storage chamber configured in the heat insulation box to ultra-low temperature with an evaporator, the machine room is provided on the side of the heat insulation box and is equipped with a compressor etc. Since the heat insulating structure that surrounds the exchanger and each intermediate heat exchanger with a heat insulating material is arranged on the side wall of the heat insulating box on the machine room side, the cascade heat exchanger and each intermediate heat The depth of the entire device can be reduced compared to the case where a heat insulating structure formed by surrounding the exchanger with a heat insulating material is installed on the back surface of the heat insulating box.
- the heat insulating box is formed by a composite structure of a vacuum heat insulating panel and a foam heat insulating material.
- a heat insulating structure for surrounding the cascade heat exchanger and the surroundings of each intermediate heat exchanger is provided on the back of the heat insulating box as in the past. Since it is not provided, it becomes possible to arrange the vacuum heat insulation panel that is not affected by the heat insulation structure in the front and rear walls of the heat insulation box and the side wall opposite to the machine room. As a result, it is possible to reduce the amount of leakage of waste water and to suppress waste of cooling energy.
- the storage room is kept at, for example, -80 ° C or less. Even when the temperature is extremely low, the heat insulation performance of the heat insulation box itself can be improved, and the size can be reduced.
- the storage volume can be expanded. Or, even with the same accommodation volume as the conventional one, it is possible to reduce the outer dimensions, which also makes it possible to reduce the area required for installing the refrigeration apparatus.
- the heat insulating structure can be inserted / removed from the rear, the front, or the upper side, so that the cascade heat exchange and the intermediate heat exchanger are performed.
- Cascade heat exchange and intermediate heat exchange can be easily incorporated into the main body by inserting the heat insulation structure that is integrated with the heat insulation material from the rear, front, or top, making it easy to assemble. Can be improved.
- the integrated heat insulation structure can be removed from the main body by pulling it backward, forward, or upward, facilitating maintenance work for cascade heat exchange and intermediate heat exchange. thing Is possible.
- the piping from the heat insulating structure faces the surface in the direction in which the heat insulating structure is inserted and removed. After installing the compressor, etc., it is possible to connect the pipes from the machine room side or the heat insulation box side in that state and insert the heat insulation structure at the end. It is possible to improve the performance and assembly workability.
- FIG. 1 is a perspective view of a refrigeration apparatus 1 to which the present invention is applied
- FIG. 2 is a front view of the refrigeration apparatus 1
- FIG. 3 is a plan view of the refrigeration apparatus 1
- FIG. 4 is a perspective view of a storage chamber 4 of the refrigeration apparatus 1.
- FIG. 5 shows a perspective view of the refrigeration apparatus 1 with the top panel 5 opened.
- the refrigeration apparatus 1 of the present embodiment is suitable for ultra-low temperature storage of, for example, a living tissue or specimen that is stored at a low temperature for a long period of time, and includes a heat insulating box 2 that opens to the upper surface, and a side of the heat insulating box 2 And the machine room 3 in which the compressor 10 and the like are installed.
- This heat insulating box 2 is composed of a steel plate outer box 6 with an open upper surface, a metal inner box 7 such as aluminum having good thermal conductivity, and the upper ends of both boxes 6, 7. It is composed of a synthetic resin breaker 8 to be connected, and a polyurethane resin heat insulating material 9 filled in the space enclosed by these outer box 6, inner box 7 and breaker 8 by an on-site foaming method.
- the inside of the inner box 7 is a storage chamber 4 with an open top surface.
- the target temperature in the storage chamber 4 (hereinafter referred to as the internal temperature) is set to 150 ° C or less, for example, so that the heat insulating box 2 that partitions the inside of the storage chamber 4 from the outside air is used.
- the heat insulation capacity is required.
- the heat insulation capability only with the above-described heat insulating material 9 made of polyurethane resin, it must be formed extremely thick, and with a limited body size, the storage capacity in the storage chamber 4 is limited. There is a problem that it is not possible to secure enough.
- the heat insulating box 2 in the present embodiment is made of glass wool on each inner wall surface of the side wall 6C located on the side opposite to the side on which the front wall 6A, the rear wall 6B, and the machine room 3 of the outer box 6 are provided.
- the vacuum insulation panel 12 is placed and temporarily fixed with double-sided adhesive tape. Insulating material 9 is filled in-situ foaming method.
- the vacuum heat insulation panel 12 stores glass wool having heat insulation in a container formed of a multilayer film having aluminum or non-breathable aluminum or synthetic resin. After that, the air in the container is discharged by a predetermined evacuation means, and the opening of the container is joined by thermal welding. Therefore, the vacuum heat insulation panel 12 can obtain the same heat insulation effect while making the thickness of the heat insulating material 9 thinner than before due to the heat insulation performance.
- an evaporator (evaporation pipe) 62 constituting a refrigerant circuit of a cooling device R, which will be described later in detail, is attached to the peripheral surface of the inner box 7 on the heat insulating material 9 side in a heat exchange manner.
- the upper surface of the breaker 8 of the heat insulating box 2 configured as described above is formed in a stepped shape as shown in Fig. 2 and Fig. 4, and there is a heat insulating door through a packing (not shown). 13 is provided at one end, and in this embodiment, is pivotally provided by pivot members 14 and 14 around the rear end. Further, the upper opening of the storage chamber 4 is provided with an inner lid 15 made of a heat insulating material so as to be freely opened and closed. In addition, a pressing portion configured to protrude downward is formed on the lower surface of the heat insulating door 13, whereby the pressing portion of the heat insulating door 13 presses the inner lid 15, thereby the storage chamber 4. The upper surface opening is closed so as to be freely opened and closed. In addition, a handle portion 16 is provided at the other end of the heat insulating door 13, that is, the front end in the present embodiment, and the heat insulating door 13 is opened and closed by operating the handle portion 16.
- the machine room 3 is provided by a side panel 3B that constitutes a side surface opposite to the front panel 3A, a rear panel (not shown), and the side on which the heat insulation box 2 is provided. It is The machine room 3 in this embodiment is provided with a partition plate 17 that divides the interior vertically. Below the partition plate 17, the compressors 10, 20 and the like constituting the cooling device R as described above are accommodated and installed. The front panel 3A and the side panel 3B located below the partition plate 17 are provided with ventilation holes. A slit 3C is formed.
- an upper machine chamber 18 having an upper surface opened is provided above the partition plate 17, an upper machine chamber 18 having an upper surface opened is provided.
- a top panel 5 is provided at the top opening of the upper machine room 18 so as to be pivotable around the rear end in this embodiment, so that the upper machine room 18 can be opened and closed. Obstructed.
- the panel provided in front of the upper machine room 18 is used for operating the refrigeration apparatus 1.
- the operation panel 21 is used.
- a measurement hole 19 is formed on a side surface of the upper machine chamber 18 on the heat insulating box 2 side.
- the measurement hole 19 penetrates the outer box 6, the heat insulating material 9 and the inner box 7 constituting the heat insulating box 2 so as to communicate with the storage chamber 4 formed in the heat insulating box 2 provided adjacently. Formed.
- the measurement hole 19 can also insert a temperature sensor into the storage chamber 4 with an external force, and the wiring drawn from the temperature sensor is connected to the external recording apparatus main body through the measurement hole 19. Then, the measurement hole 19 is closed by a plug 19A made of a special material that can be deformed in a sponge-like manner and has a heat insulating property. When the temperature sensor is not attached, the measurement hole 19 is thermally blocked by the stopper 19A.
- the top panel 5 provided in the machine room 3 is opened, and the heat insulation located in the upper machine room 18 is opened.
- the measurement device can be inserted into the storage chamber 4 through the measurement hole 19 formed on the side surface of the box body 2 side. Therefore, it becomes easy to install the measuring device in the storage chamber 4 cooled to a predetermined ultra-low temperature.
- the measurement hole 19 in the present embodiment is formed on the side surface of the heat insulating box 2 on the machine room 18 side, so that the refrigeration apparatus 1 is Even when it is installed adjacent to a wall or other equipment in an installation environment such as a laboratory, it is not necessary to have a special interval for using the measurement hole 19. As a result, the area required for installing the refrigeration apparatus 1 can be reduced, which is suitable for layout in a laboratory or the like.
- the measurement hole 19 is formed in the wall surface of the heat insulating box 2 adjacent to the machine room 3, the measurement hole 19 is configured to face the side other than the machine room 3, that is, facing the outside. It is possible to dispose the vacuum insulation panel 12 as described above on the front and rear walls and side surfaces of the heat insulation box 2 without affecting the position where the measurement hole 19 is formed.
- the heat insulating performance of the heat insulating box 2 itself can be improved, and the heat insulating wall Therefore, even if the external dimensions are the same as the conventional size, the storage volume in the storage chamber 4 can be increased. Or, even with the same storage volume as before, it is possible to reduce the outer dimensions, which also makes it possible to reduce the area required for installing the refrigeration apparatus 1. .
- the measurement hole 19 in the present embodiment can be concealed by the top panel 5 that can open and close the upper surface opening of the upper machine room 18, the measurement hole 19 is not exposed to the appearance. It is possible to improve the appearance. Also, by opening the top panel 5, it becomes possible to easily operate the measurement hole 19, and workability can be improved. Further, by removing the partition plate 17, it becomes easy to operate the devices constituting the other cooling devices R installed below the partition plate 17, and it becomes possible to improve the maintenance work.
- the top panel 5 can be used as a work side stand by closing the inside of the machine room 18 except when the measurement hole 19 is operated. Thus, it is suitable for the delivery work of articles such as samples into the storage chamber 4.
- the measurement hole 19 is a force concealed by the top panel 5 that closes the upper surface opening of the upper machine room 18.
- a lid member for concealing the measurement hole 19 may be provided.
- the refrigerant circuit of the refrigeration apparatus 1 in this embodiment includes a high-temperature side refrigerant circuit 25 as a first refrigerant circuit and a low-temperature side refrigerant circuit 38 as a second refrigerant circuit as independent multi-stage multi-stage refrigerant circuits. It consists of a two-stage, two-stage refrigerant circuit.
- the compressor 10 constituting the high temperature side refrigerant circuit 25 is an electric compressor using a one-phase or three-phase AC power source, and the discharge side pipe 10D of the compressor 10 is connected to the auxiliary condenser 26. .
- This auxiliary condenser 26 is used to heat the opening edge of the storage chamber 4 to prevent dew condensation. It is connected to a refrigerant pipe 27 (hereinafter referred to as a frame pipe) arranged on the back side of the opening edge.
- the frame pipe 27 is connected to the condenser 28 after being connected to the oil cooler 29 of the compressor 10.
- the refrigerant pipe exiting the condenser 28 is connected to the oil cooler 30 of the compressor 20 constituting the low-temperature side refrigerant circuit 38, and then connected to the condenser 31.
- the refrigerant pipe exiting the condenser 31 Are connected to an evaporator 34 as an evaporator portion constituting the evaporator through a dryer 32 and a cavity tube 33 as a decompression device in order.
- An accumulator 35 serving as a refrigerant reservoir is connected to the outlet-side refrigerant pipe of the evaporator 34, and the refrigerant pipe exiting the accumulator 35 is connected to the suction-side pipe 10 S of the compressor 10.
- the auxiliary condenser 26 and the condensers 28 and 31 in this embodiment are configured as an integral condenser and are cooled by the condenser blower 36.
- the high temperature side refrigerant circuit 25 is filled with a refrigerant composed of R407D and n-pentane as a non-azeotropic refrigerant having different boiling points.
- R407D has R32 (difluoromethane: CH F) and R125 (
- Pentafluoroethane CHF CF
- R134a l, 1, 1, 2—tetrafluoroethane: C
- R32 is 15 weight 0/0
- R125 is 15 weight 0/0
- 4a is 70% by weight.
- the boiling points of each refrigerant are R32-51.8 ° C, R125 force-48.57 ° C, and R134a-26.16 ° C.
- the boiling point of n-pentane is + 36.1 ° C.
- the high-temperature gaseous refrigerant discharged from the compressor 10 is supplied to the auxiliary condenser 26, the frame pipe 27, the oil cooler 29, the condenser 28, the compressor 20 of the low-temperature side refrigerant circuit 38, the oil cooler 30 of the compressor 20, and the condenser 31.
- the water contained in the dryer 32 is removed after being condensed in the radiator 32, and the pressure is reduced in the capillary tube 33 and flows into the evaporator 34 one after another to evaporate the refrigerant R32, R1 25 and Rl 34a. Then, the evaporator 34 absorbs the heat of vaporization and cools the evaporator 34 and returns to the compressor 10 through the accumulator 35 as a refrigerant liquid reservoir.
- the capacity of the compressor 10 is, for example, 1.5 HP, and the final temperature reached by the evaporator 34 during operation is -27 ° C to -35 ° C.
- n-pentane in the refrigerant has a boiling point of +36. 1 ° C, so it does not evaporate in the evaporator 34 and remains in the liquid state. Due to the function of returning the lubricant to the compressor 10 in a state where water is dissolved in the lubricating oil of the machine 10 and the dryer 32, and the evaporation of the liquid refrigerant in the compressor 10, The function of reducing the temperature of the compressor 10 is achieved.
- the compressor 20 is an electric compressor that uses a one-phase or three-phase AC power supply like the compressor 10, and the discharge-side piping 20D of the compressor 20 includes
- the oil separator 40 is connected through a radiator 39 composed of a wire capacitor.
- the oil separator 40 is connected to an oil return pipe 41 that returns to the compressor 20.
- the refrigerant pipe connected to the outlet side of the oil separator 40 is connected to a condensing pipe 42 as a high-pressure side pipe inserted into the evaporator 34.
- This condensing pipe 42, together with the evaporator 34, constitutes a cascade heat exchange ⁇ 43.
- the discharge pipe connected to the outlet side of the condensing pipe 42 is connected to the first gas-liquid separator 46 via the dryer 44.
- the gas-phase refrigerant separated by the gas-liquid separator 46 passes through the first intermediate heat exchanger via the gas-phase pipe 47 and flows into the second gas-liquid separator 49.
- the liquid-phase refrigerant separated by the first gas-liquid separator 46 flows into the first intermediate heat exchanger via the liquid-phase pipe 50, the dryer 51, and the first tube 52 as a decompression device.
- the liquid refrigerant separated by the second gas-liquid separator 49 passes through the dryer 54 through the liquid phase pipe 53 and then the second tube 55 as a decompression device, and then the second intermediate heat exchanger 56. Flow into.
- the gas-phase refrigerant separated by the second gas-liquid separator 54 passes through the second intermediate heat exchanger 56 via the gas-phase pipe 57, and the third and fourth intermediate heat exchangers 58,
- the liquid is cooled and liquidified while passing through 59, and flows into a capillary tube 61 as a pressure reducing device via a pipe 68 through a dryer 60.
- the capillary tube 61 is connected to an evaporation pipe 62 as an evaporator, and the evaporation pipe 62 is further connected to a fourth intermediate heat exchanger 59 via a return pipe 69.
- the fourth intermediate heat exchanger 59 is connected to the third, second, and first intermediate heat exchangers 58, 56, and 48 one after another, and is then connected to the suction side pipe 20S of the compressor 20. .
- an expansion tank 65 for storing refrigerant when the compressor 20 is stopped is connected to the suction side pipe 20S via a capillary tube 66 as a decompression device.
- the expansion tube 65 is connected to the capillary tube 66.
- a check valve 67 with the direction as the forward direction is connected in parallel.
- the low-temperature refrigerant circuit 38 is filled with non-azeotropic refrigerant mixtures including R245fa, R600, R404A, R508, R14, R50, and R740 as seven types of mixed refrigerants having different boiling points.
- R245fa is 1, 1, 1, —3, 3 pentafluoropropane (CF CH CHF), R
- 600 is butane (CH 2 CH 2 CH 2).
- the boiling point of R245fa is + 15.3 ° C, R600
- the boiling point is -0.5 ° C. Therefore, by mixing these at a predetermined ratio, it can be used as an alternative to R21, which has a boiling point of + 8.9 ° C, which has been used in the past.
- R600 is a flammable substance, it is sealed in the refrigerant circuit 38 as nonflammable by mixing with R245fa which is nonflammable at a predetermined ratio, in this example R245faZR600: 70Z30. And In this embodiment, the force that makes R245fa 70% by weight relative to the total weight of R245fa and R600 is non-flammable, so it may be more than that.
- R404A is composed of R125 (pentafluoroethane: CHF CF) and R143a (l, 1, 1-trif
- R508 is R23 (trifluoromethane: CHF) and R116 (hexafluoroethane: CF C).
- the boiling point of the mixed refrigerant is -88.64 ° C.
- R14 is tetrafluoromethane (carbon tetrafluoride: CF), and R50 is methane (CH
- R740 is argon (Ar). These boiling points are R14 force of 127.9 ° C, R50 of -161.5 ° C, and R740 of 185.86 ° C. R50 has a danger of explosion when combined with oxygen, but mixing with R14 eliminates the danger of explosion. Therefore, even if a mixed refrigerant leakage accident occurs, no explosion should occur.
- these refrigerants described above are: and after pre-mixing R245fa and R600, and R14 and R50 to form a non-combustible soot state, a mixed refrigerant of R245fa and R600, R404A, and R508A
- the mixed refrigerant of R14 and R50 and R740 are mixed in advance and sealed in the refrigerant circuit.
- R245fa and R600, then R404A, R5080A, R14 and R50, and finally R740 are sealed in descending order.
- the composition of each refrigerant for example, mixed refrigerant force of R245fa and R600 10.
- it may be a 4% by weight of 11 pentane (range of 0.5 to 2 weight 0/0 for the total weight of the non-azeotropic refrigerant) in ⁇ Ka ⁇ in R404A Shall.
- the high-temperature and high-pressure gaseous mixed refrigerant discharged from the compressor 20 flows into the radiator 39 via the discharge-side pipe 20D, where it is radiated and oil having a high boiling point in the mixed refrigerant and high oil compatibility.
- a part of n-pentane or R600 as carrier refrigerant is condensed.
- the mixed refrigerant that has passed through the radiator 39 flows into the oil separator 40, and most of the lubricating oil of the compressor 20 mixed with the refrigerant and the refrigerant condensed in the radiator 39 are mixed.
- Part (n-pentane, part of R600) is returned to the compressor 20 through the oil return pipe 41.
- the low-boiling point refrigerant having higher purity flows through the refrigerant circuit 38 downstream from the cascade heat exchanger 43, and it is possible to efficiently obtain an ultra-low temperature.
- even the compressors 10 and 20 having the same capacity can cool the interior of the storage chamber 4 to be cooled to a predetermined ultra-low temperature, and the overall size of the refrigeration apparatus 1 is increased. It is possible to increase the storage capacity without doing so.
- the temperature of the refrigerant entering the cascade heat exchange can be lowered. It becomes. Specifically, in the present embodiment, the refrigerant temperature flowing into the cascade heat exchanger 43 in the past can be lowered to about + 45 ° C. in this embodiment.
- the cascade heat exchanger 43 it is possible to reduce the load applied to the compressor of the high temperature side refrigerant circuit 25 for cooling the refrigerant in the low temperature side refrigerant circuit 35.
- the load applied to the compressor 20 constituting the low temperature side refrigerant circuit 35 can be reduced. This makes it possible to improve the operation efficiency of the entire refrigeration apparatus 1.
- the other mixed refrigerant itself is cooled by the cascade heat exchanger 43 from the evaporator 34 to about ⁇ 40 ° C. to ⁇ 30 ° C., and a part of the refrigerant having a high boiling point in the mixed refrigerant (R245fa, R600, R404A and a part of R508) are condensed. And the condensation pipe 42 of the cascade heat exchange 43 The mixed refrigerant that has exited flows into the first gas-liquid separator 46 via the dryer 44.
- R14, R50, and R740 in the mixed refrigerant are still not condensed because they have very low boiling points, and only some of R245fa, R600, R404A, and R508 are condensed and liquefied.
- R14, R50, and R740 are separated into gas phase piping 47, and R245fa, R600, R404A, and R508A are separated into liquid phase piping 50.
- the refrigerant mixture flowing into the gas-phase pipe 47 is condensed by exchanging heat with the first intermediate heat exchanger 48, and then reaches the second gas-liquid separator 49.
- the low-temperature refrigerant returning from the evaporation pipe 62 flows into the first intermediate heat exchange, and the liquid refrigerant flowing into the liquid-phase pipe 50 is further depressurized by the capillary tube 52 through the dryer 51.
- a part of the uncondensed R14, R50, R740, and R508 is cooled, resulting in the first intermediate heat exchange.
- the intermediate temperature of vessel 48 is about -60 ° C.
- R508 in the mixed refrigerant that has passed through the gas-phase pipe 47 is completely condensed and liquefied, and is divided into the second gas-liquid separator 49.
- R14, R50, and R740 are still in a gas state because of their lower boiling points.
- the intermediate temperature of the second intermediate heat exchanger 56 is about -90 ° C.
- the gas-phase piping 57 passing through the second intermediate heat exchange passes through the third intermediate heat exchanger 58 and then passes through the fourth intermediate heat exchange.
- the refrigerant immediately after leaving the evaporator 62 is returned to the fourth intermediate heat exchanger, and according to experiments, the intermediate temperature of the fourth intermediate heat exchanger 59 is considerably low at about 130 ° C. Reach temperature.
- each intermediate heat exchanger 48, 56, 58, 59 condenses the refrigerant still in a gas phase state one after another,
- the evaporation pipe 62 is configured to be heat-exchanged along the heat insulating material 9 side of the inner box 6 so that the inside temperature of the storage room 4 of the refrigeration apparatus 1 is 152 ° C. or lower. It can be realized.
- the refrigerant that has left the evaporation pipe 62 passes through the fourth intermediate heat exchanger 59, the third intermediate heat exchanger 58, the second intermediate heat exchanger 56, and the first intermediate heat exchanger 48 one after another.
- the refrigerant flows in, merges with the refrigerant evaporated in each heat exchanger, and returns to the compressor 20 from the suction pipe 20S.
- the compressor 20 constituting the low-temperature side refrigerant circuit 38 as described above is subjected to ON / OFF control by a control device (not shown) based on the internal temperature in the storage chamber 4.
- a control device not shown
- the mixed refrigerant in the low-temperature side refrigerant circuit 38 enters the expansion tank 65 via the check valve 67 whose forward direction is the expansion tank 65 direction.
- the refrigerant circuit 3 8 has an extremely high speed through the check valve 67. This refrigerant can be recovered in the expansion tank 65.
- the refrigerant can be quickly collected into the expansion tank 65 when the compressor 20 is stopped.
- the pressure in the refrigerant circuit 38 can be quickly balanced, and when the compressor 20 is restarted, the compressor 20 can be restarted smoothly without applying a load to the compressor 20. Can do.
- This significantly improves the operating efficiency of the compressor 20 by significantly reducing the time required for the refrigerant circuit 38 to reach an equilibrium pressure when the compressor is started. For example, the time required for pull-down operation is reduced. It is possible to improve convenience.
- the evaporation pipe 62 of the low-temperature side refrigerant circuit 38 has an extremely low temperature of 166.3 ° C to 157.3 ° C, and even in the cascade heat exchanger 43- 40 ° C to -30 ° C. Furthermore, the first intermediate heat exchanger 48 is about 60 ° C, the second intermediate heat exchanger 56 is about 90 ° C, and the third and fourth intermediate heat exchangers 58 and 59 are 130 ° C. It becomes extremely low at around ° C. Therefore, it is necessary to sufficiently insulate other heat exchangers 43 and the like other than the evaporation pipe 62 disposed in the heat insulating box 2.
- the cascade heat exchanger 43 and the first, second, third, and fourth intermediate heat exchangers have a heat insulating structure 70 that is surrounded by a heat insulating material to form a rectangular body.
- FIG. 7 shows a perspective view of the heat insulating structure 70
- FIG. 8 shows a perspective view of the heat insulating structure 70 with the heat insulating material removed.
- the detailed structure of the heat insulating structure 70 will be described. 6, that is, in addition to the heat exchangers described above, in addition to the above heat exchangers, an accumulator 35 that constitutes the high-temperature side refrigerant circuit 25, a capillary tube 33, and a dryer that constitutes the low-temperature side refrigerant circuit 38.
- the gas-liquid separators 46 and 49, the dryers 51 and 54, and the capillary tubes 52 and 55 constitute the heat insulating structure 70.
- a cascade heat exchanger 43 is disposed at one end of the heat insulating structure 70, and the intermediate heat exchangers 48, 56, 5 8, 59 are layered on the side of the cascade heat exchanger 43. It is arranged.
- each of the intermediate heat exchangers 48, 56, 58, 59 a relatively large diameter outer pipe is spirally wound in a plurality of stages to superimpose flattened ones, and the insides are spaced apart.
- Each of the gas-phase pipes 47 and 5 7 has a spiral double pipe structure through which it passes as an inner pipe.
- the lower force is also arranged in the order of lower temperature, that is, the fourth and third intermediate heat exchangers 58 and 59 are arranged in the lowermost layer, and the second intermediate heat exchanger 56 is arranged thereon, First intermediate heat exchanger on top layer 48 Is placed.
- the gas-liquid separators 46 and 49 (the second gas-liquid separator 49 is not shown in Fig. 8) are dried inside the intermediate heat exchanger and around the cascade heat exchanger 43. 44, 51, 54 (not shown in Fig. 8), each non-illustrated cylindrical tube 33, 52, 55 and accumulator 35 are arranged to reduce dead space and reduce dimensions. Yes.
- the heat insulating structure 70 in the embodiment is configured such that the pipe connecting the device disposed in the heat insulating structure 70 and the device disposed outside the heat insulating structure 70 is the cascade.
- the heat exchanger 34 is disposed so as to face one end side surface opposite to the side on which the heat exchanger 34 is disposed.
- the discharge side pipe 10D after passing through the condenser 31 of the high temperature side refrigerant circuit 25 connected to the cascade heat exchanger 34, and the suction side pipe 10S connected to the compressor 10,
- the low-temperature side refrigerant circuit 38 connected to the heat exchanger 34 and the oil separator 40 of the low-temperature side refrigerant circuit 38
- the discharge-side pipe 20D, the suction-side pipe 20S connected to the suction side of the compressor 20 connected to the suction side of the compressor 20, the fourth intermediate heat exchanger Connection portion of each pipe of the pipe 68 connected to the evaporation pipe 62 from the gas-phase pipe 57 arranged in the 59 and the return pipe 69 connected to the fourth intermediate heat exchanger 59 from the evaporation pipe 62
- the portion is intensively disposed on one side surface of the heat insulating structure 70.
- the suction side pipes 10S, 20S and the discharge side pipe 20D through which the refrigerant having a relatively high temperature flows are converged to the outside, and in this embodiment, the heat insulation structure 70 is provided in the heat insulation box.
- the heat insulation structure 70 is attached to the heat insulation box 2 and is directed to the heat insulation box 2 side outside the 10S and the like.
- the dryer 60 and the capillary tube 61 connected to the pipe 68 are disposed outside the heat insulating structure 70.
- FIG. 9 shows a rear perspective view of the refrigeration apparatus 1.
- a rectangular opening 71 extending in the front-rear direction and opening rearward is formed on the side wall of the heat insulating box 2 located on the machine room 3 side.
- a notch 72 is also formed in the rear side of the side wall on the machine room 3 side.
- the heat insulating structure 70 as described above is inserted into the opening 71 from the back of the heat insulating box 2. At this time, the heat insulating structure 70 is connected to the cascade heat exchanger 3.
- each pipe 10S, 20S, 20D, 68, 69 which is disposed to extend to one side of the heat insulating structure 70, the high-temperature side refrigerant circuit
- the pipe 10D to which 25 capillary tubes 33 are connected faces the surface in the direction in which the heat insulating structure 70 is inserted and removed, that is, the back surface of the heat insulating box 2 in this embodiment.
- the heat insulating structure 70 is inserted into the opening 71, and in this state, the pipes 68 and 69 are connected to the heat insulating box 2 Connect piping to the evaporation pipe 62 provided on the side, and connect piping 10S, 10D, 20S, and 20D to equipment on the machine room 3 side. From this, the equipment constituting the heat insulation structure 70, the evaporation pipe 62 arranged in the heat insulation box 2, the compressors 10 and 20 arranged in the machine room 3, and the like, The rear surface force of the heat insulating box 2 can be easily connected to the piping, and the piping workability and the assembly workability can be improved. In addition, even if each device constituting the heat insulation structure 70 breaks down, the heat insulation structure 70 can be pulled out in the direction, not on the side where the heat insulation box 2 or the machine room 3 is formed. Therefore, it is possible to easily perform maintenance work.
- a back surface constituted by extending each pipe of the heat insulating structure 70 and a part of a side surface facing the machine room 3 side are closed by a cover member 73 bent in a substantially L-shaped cross section. Is done.
- a heat insulating plate (not shown) filled with glass wool or the like may be disposed in the gap formed between the heat insulating structure 70 and the side surface on the machine room 3 side.
- the cascade heat exchanger 43 and the intermediate heat exchangers 48, 56, 5 8, and 59 are in the state of the heat insulating structure 70 integrally formed of the heat insulating material in the heat insulating box. Since the heat insulation structure 70 is installed on the back surface of the heat insulation box 2 as in the conventional case, the entire depth of the refrigeration apparatus 1 is disposed on the side wall of the machine room 3 side of the body 2. Can be reduced.
- the presence of the overhang portion by the heat insulating structure 70 for enclosing the cascade heat exchanger 43 and the like can avoid the disadvantage that the overall depth dimension of the apparatus 1 becomes large.
- the overall depth dimension can be suppressed to about 765 mm while the internal depth dimension is secured to about 495 mm.
- the usual entrance generally about 800mm
- the heat insulation structure 70 can be delivered to and out of a general loading robot while attached to the apparatus 1, it is necessary to separate and connect the heat insulation structure 70 from the main body at the installation location. It becomes possible to avoid complicated work.
- the heat insulating box 2 and the heat insulating structure for enclosing the periphery of each intermediate heat exchanger are not provided on the back surface of the heat insulating box 2 as in the prior art, as described above, It is possible to dispose the vacuum heat insulation panel 12 in the front wall 6A rear wall 6B and the side wall 6C opposite to the machine room of the heat insulation box 2 configured to face the inside of the storage room 4. — It is possible to improve the heat insulation performance of the heat insulation box 2 itself even at an extremely low temperature of 150 ° C or less. Therefore, the size can be reduced, and the storage volume in the storage chamber 4 can be increased even with the same external dimensions as the conventional one. Alternatively, even with the same storage volume as in the conventional case, the outer dimensions can be reduced, and this also makes it possible to reduce the area required for installing the refrigeration apparatus 1.
- the heat insulation structure 70 can be inserted into and removed from the rear side of the refrigeration apparatus 1, that is, from the back side into the side wall of the heat insulation box 2.
- the heat insulation structure 70 is not limited to this. It may be possible to insert / remove an upper force from the front of the box 2.
- the cascade heat exchanger 43 and the intermediate heat exchangers 48 integrated as the heat insulating structure 70 can be easily incorporated into the main body of the apparatus 1 as in this embodiment, and the assembly workability is improved. Can be improved.
- the heat insulating structure 70 is a force that integrally constitutes the cascade heat exchange, each intermediate heat exchange, and the like that constitute the refrigeration apparatus 1.
- the cascade heat exchanger 43, or only the intermediate heat exchangers 48, etc. may be integrally configured as the heat insulating structure 70 and may be detachably disposed on the side wall of the heat insulating box 2 as in this embodiment. It shall be
- the refrigerant circuit constituting the refrigeration apparatus 1 condenses the refrigerant discharged from the compressor 10 or 20, respectively, and then evaporates and evaporates to provide an independent refrigerant closed circuit that exhibits a cooling action.
- the low-temperature side refrigerant circuit 38 is composed of the compressor 20, the condensing pipe 42, the evaporation pipe 62, and the return refrigerant from the evaporation pipe 62.
- the lowest boiling point refrigerant flows into the evaporation pipe 62 through the final stage capillary tube 61, and cascade heat exchange is performed between the evaporator 34 of the high temperature side refrigerant circuit 25 and the condensation noise 42 of the low temperature side refrigerant circuit 38.
- the force described as the two-stage multi-stage refrigeration apparatus 1 that constitutes 43 and obtains an ultra-low temperature with the evaporation pipe 42 of the low-temperature side refrigerant circuit 38 is not limited to this.
- each has a high-temperature side refrigerant circuit and a low-temperature side refrigerant circuit that constitute an independent refrigerant closed circuit that condenses and evaporates the refrigerant discharged from the compressor and exhibits a cooling action
- This is a simple multiple (two-way) type refrigeration system that forms a cascade heat exchanger with the evaporator of the high-temperature side refrigerant circuit and the condenser of the low-temperature side refrigerant circuit, and obtains ultra-low temperature with the evaporator of the low-temperature side refrigerant circuit.
- the cascade heat exchanger 43 in the heat insulating structure 70 as in this embodiment, and inserting the heat insulating structure 70 on the side surface of the heat insulating box 2 on the machine room 3 side, Similar effects can be obtained.
- a compressor, a condenser, an evaporator, a plurality of intermediate heat exchangers connected in series so that a return refrigerant from the evaporator circulates, and a plurality of decompression devices are provided, A non-azeotropic refrigerant mixture is enclosed, and the condensed refrigerant in the refrigerant that has passed through the condenser is joined to the intermediate heat exchanger via the decompression device, and the uncondensed refrigerant in the refrigerant is cooled by the intermediate heat exchanger.
- each intermediate heat exchanger By configuring the heat insulating structure 70 as in the present embodiment and allowing the heat insulating structure 70 to be inserted into and removed from the side surface of the heat insulating box 2 on the machine room 3 side, the same effect can be obtained.
- FIG. 1 is a perspective view of a refrigeration apparatus to which the present invention is applied.
- FIG. 2 is a front view of the refrigeration apparatus of FIG.
- FIG. 3 is a plan view of the refrigeration apparatus of FIG.
- FIG. 4 is a side view of the refrigeration apparatus shown in FIG.
- FIG. 5 is a perspective view of the refrigeration apparatus with the top panel opened.
- FIG. 6 is a refrigerant circuit diagram of the refrigeration apparatus of FIG.
- FIG. 7 is a perspective view of a heat insulating structure.
- FIG. 8 is a perspective view of the heat insulation structure with the heat insulating material removed.
- FIG. 9 is a rear perspective view of the refrigeration apparatus showing a state in which the heat insulating structure is attached.
- FIG. 10 is a refrigerant circuit diagram of a conventional refrigeration apparatus.
- FIG. 11 is a rear perspective view of a conventional refrigeration apparatus.
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Abstract
Description
Claims
Priority Applications (4)
Application Number | Priority Date | Filing Date | Title |
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EP07743280.5A EP2019270B1 (en) | 2006-05-15 | 2007-05-14 | Refrigeration system |
CN2007800177207A CN101443603B (zh) | 2006-05-15 | 2007-05-14 | 冷冻装置 |
KR1020087027846A KR101364381B1 (ko) | 2006-05-15 | 2007-05-14 | 냉동 장치 |
US12/300,700 US8826686B2 (en) | 2006-05-15 | 2007-05-14 | Refrigeration apparatus |
Applications Claiming Priority (2)
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JP2006-135287 | 2006-05-15 | ||
JP2006135287A JP5026736B2 (ja) | 2006-05-15 | 2006-05-15 | 冷凍装置 |
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WO2007132804A1 true WO2007132804A1 (ja) | 2007-11-22 |
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PCT/JP2007/059845 WO2007132804A1 (ja) | 2006-05-15 | 2007-05-14 | 冷凍装置 |
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US (1) | US8826686B2 (ja) |
EP (1) | EP2019270B1 (ja) |
JP (1) | JP5026736B2 (ja) |
KR (1) | KR101364381B1 (ja) |
CN (1) | CN101443603B (ja) |
WO (1) | WO2007132804A1 (ja) |
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JP2007303793A (ja) | 2007-11-22 |
US20090113917A1 (en) | 2009-05-07 |
CN101443603B (zh) | 2011-04-20 |
EP2019270B1 (en) | 2017-12-13 |
CN101443603A (zh) | 2009-05-27 |
EP2019270A4 (en) | 2014-01-01 |
KR20090008341A (ko) | 2009-01-21 |
JP5026736B2 (ja) | 2012-09-19 |
US8826686B2 (en) | 2014-09-09 |
KR101364381B1 (ko) | 2014-02-17 |
EP2019270A1 (en) | 2009-01-28 |
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