WO2022201574A1 - 冷凍回路 - Google Patents
冷凍回路 Download PDFInfo
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- WO2022201574A1 WO2022201574A1 PCT/JP2021/028510 JP2021028510W WO2022201574A1 WO 2022201574 A1 WO2022201574 A1 WO 2022201574A1 JP 2021028510 W JP2021028510 W JP 2021028510W WO 2022201574 A1 WO2022201574 A1 WO 2022201574A1
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- coil
- refrigerant
- magnetic field
- refrigerating circuit
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Images
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
- 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
-
- 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
- F25B13/00—Compression machines, plants or systems, with reversible cycle
-
- 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
- F25B21/00—Machines, plants or systems, using electric or magnetic effects
-
- 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
- F25B39/00—Evaporators; Condensers
- F25B39/02—Evaporators
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B41/00—Fluid-circulation arrangements
- F25B41/40—Fluid line arrangements
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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
- F25B2339/00—Details of evaporators; Details of condensers
- F25B2339/02—Details of evaporators
Definitions
- the present invention relates to a refrigerating circuit, and more particularly to a refrigerating circuit that can stably generate a magnetic field for a long time.
- alternating magnetic field therapy that kills tumor cells using heating by alternating magnetic fields is known (for example, Patent Document 1).
- a coil that uses the principle of induction heating, such as the Induction Heater generates heat by itself when a large current is passed through it. Therefore, cooling by flowing cooling water inside the coil is known.
- FIG. 11 is a diagram showing a prior art cooling system 501 .
- cooling system 501 is configured to cool conventional coil 502 with cooling water.
- a high-frequency current generator 503 is connected to the coil 502 .
- a cooling system 501 is configured with a path 504 for flowing cooling water to the coil 502 .
- the path 504 is provided with a tank 505 that stores cooling water, a pump 506 that sends the cooling water from the tank 505 to circulate through the path 504, and a radiator 507 that cools the cooling water circulating through the path 504. .
- Cooling water flowing through path 504 flows inside the pipe of coil 502 . This cools the coil 502 .
- 10 (kW) 4.18 (J / kg ⁇ ° C.) ⁇ 10 (° C.) ⁇ mass flow rate M (kg /s) must be satisfied. That is, if the mass flow rate M that satisfies this condition is converted into volumetric flow rate, it is necessary to feed circulating water of 14 (L/min).
- the coil pitch for generating a strong magnetic field needs to be extremely narrow. Therefore, as described above, the pressure loss due to the circulation of water becomes enormous, and the water pump for cooling becomes large-scale.
- An object of the present invention is to provide a refrigerating circuit of a magnetic field generator capable of efficiently cooling a coil by a useful cooling method and generating a strong magnetic field stably for a long period of time.
- a refrigerating circuit of the present invention comprises a compressor, a condenser, an expansion valve, and an evaporator which are connected via refrigerant pipes. It is formed from a solenoid-wound coil, which is characterized in that it generates a magnetic field.
- the refrigeration circuit of the present invention comprises a compressor, a condenser, an expansion valve and an evaporator which are connected via refrigerant pipes.
- the evaporator is formed of a coil in which a coil base having a plurality of through-holes through which a refrigerant flows is wound in a solenoidal shape. With such a configuration, the coil can be efficiently cooled with the refrigerant as an evaporator of the refrigeration circuit. Then, the refrigerating circuit of the present invention generates a magnetic field from the coil. Therefore, a strong magnetic field can be stably generated from the cooled coil for a long time.
- the through holes may be arranged in the winding diameter direction of the coil in the cross section of the coil base material.
- the length of the coil in the direction of the winding axis can be shortened, and a compact coil can generate a strong magnetic field with high performance.
- the coil base may have a rectangular cross section and may be wound so that the long side of the cross section faces the winding diameter direction of the coil.
- the coil may be covered with an insulating material. As a result, the coil can be efficiently cooled with the evaporating refrigerant.
- a high-frequency current generator connected to the inlet side and the outlet side of the coil and supplying an alternating current may be provided.
- Such a configuration realizes highly efficient magnetic field generation from the cooled coil.
- joints on the inlet side and the outlet side of the coil may be connected to the refrigerant pipe via an insulating material. This can prevent electric leakage from the coil to the refrigerant pipe. Therefore, a high current can be safely passed through the cooled coil, and a high-performance magnetic field can be safely generated.
- hydrofluorocarbon, hydrofluoroolefin, carbon dioxide, or a mixed refrigerant thereof may be used as the refrigerant.
- the evaporation of the refrigerant can be used to efficiently cool the coil, and a strong magnetic field can be stably generated for a long period of time.
- FIG. 1 is a diagram showing a refrigerating circuit according to an embodiment of the invention.
- FIG. 2 is a diagram showing coils of a refrigeration circuit according to an embodiment of the present invention.
- FIG. 3 is a ph diagram showing the state of cooling the coil in the refrigerating circuit according to the embodiment of the present invention.
- FIG. 4 is a diagram showing the configuration near the ends of the coils in the refrigerating circuit according to the embodiment of the present invention.
- FIG. 5 is (A) a plan view and (B) a cross-sectional view showing the coil of the refrigerating circuit according to the embodiment of the present invention.
- FIG. 6 is a cross-sectional view of the coil base material of the refrigerating circuit according to the embodiment of the present invention.
- FIG. 7 is a cross-sectional view of a coil base material of a refrigeration circuit according to another embodiment of the present invention.
- FIG. 8 is a cross-sectional view of a coil base material of a refrigeration circuit according to another embodiment of the present invention.
- FIG. 9 is a cross-sectional view of a coil base material of a refrigeration circuit according to another embodiment of the present invention.
- FIG. 10 is a cross-sectional view of a coil base material of a refrigeration circuit according to another embodiment of the invention.
- FIG. 11 is a diagram showing the circuit configuration of a conventional cooling system.
- FIG. 1 is a diagram showing a schematic configuration of a refrigerating circuit 1 according to an embodiment of the present invention.
- a refrigerating circuit 1 has a coil 14 that generates a magnetic field and has a basic circuit configuration for cooling the coil 14 with a refrigerant.
- the refrigerating circuit 1 constitutes a magnetic field generator capable of stably generating a strong magnetic field from the coil 14 for a long period of time.
- the coil 14 has a compact size, for example, about the size of the human head.
- the refrigerating circuit 1 is particularly useful when it is desired to apply a large current to the coil 14 to generate a strong magnetic field.
- the refrigeration circuit 1 is suitable, for example, for treating brain tumors, breast cancer, etc. where conventional surgery is difficult or impossible.
- the refrigerating circuit 1 includes a compressor 11, a condenser 12, an expansion valve 13, and a coil 14 as an evaporator, which are connected via a refrigerant pipe 10.
- the coil 14 is cooled by evaporation of the refrigerant. Configures a vapor compression refrigeration cycle circuit.
- the compressor 11 is a device that compresses the refrigerant and sends it to the condenser 12 .
- rotary type, scroll type, reciprocating type, screw type and other various types of compression devices can be employed.
- the rotary compressor 11 is suitable for constructing a compact refrigeration circuit 1 with a small cooling capacity.
- the compressor 11 may be of a two-stage compression type.
- Employing a two-stage compression type as the compressor 11 is suitable for compressing a high-pressure carbon dioxide refrigerant.
- the condenser 12 is, for example, an air-cooled heat exchanger in which air that exchanges heat with refrigerant is sent by a fan.
- the condenser 12 may be a fin-and-tube heat exchanger. That is, the condenser 12 has a plurality of tubes such as copper pipes through which a refrigerant flows, and a plurality of aluminum fins provided in parallel, and the tubes are inserted into holes formed in the fins.
- the condenser 12 may be a water-cooled heat exchanger.
- a plate type, shell and tube type, double tube type, and other various types of heat exchangers can be employed.
- a plate-type heat exchanger is particularly preferable because it has high heat exchange efficiency and the condenser 12 can be made compact.
- the expansion valve 13 reduces the pressure of the refrigerant liquid that has passed through the condenser 12 .
- the expansion valve 13 also has a function of adjusting the flow of refrigerant.
- an electronic expansion valve, a temperature automatic expansion valve, a capillary tube, and other various types can be adopted as the expansion valve 13, the cooling of the coil 14 can be controlled with high performance, and the magnetic field generation performance can be improved.
- the coil 14 is, for example, a member for generating an alternating magnetic field as indicated by arrow B, and also functions as an evaporator of the refrigeration cycle. Coil 14 is cooled by the refrigerant by being an evaporator. As a result, the coil 14 does not reach a high temperature even when a high current flows, and can stably generate a strong magnetic field for a long period of time. Details of the coil 14 will be described later.
- the refrigerating circuit 1 has an electric circuit for operating the coil 14.
- a high-frequency current generator 35 is provided in the electrical circuit.
- a high-frequency current generator 35 is connected to the inlet side 22 of the coil 14 via a wire 38 and is connected to the outlet side 23 of the coil 14 via a wire 39 to apply an alternating current to the coil 14 .
- a magnetic field can be generated from the cooled coil 14 with high efficiency.
- FIG. 1 shows a refrigerant path of a refrigeration cycle circuit formed by refrigerant pipes 10, that is, a refrigerant circulation path.
- the coolant flows in the direction A in the coolant pipe 10 and circulates through the coolant path.
- the refrigerant compressed by the compressor 11 is sent to the condenser 12 via the refrigerant pipe 10 and cooled by the condenser 12 .
- the refrigerant cooled by the condenser 12 flows through the refrigerant pipe 10 to the expansion valve 13 and is decompressed by the expansion valve 13 .
- the refrigerant is then decompressed by the expansion valve 13 to become a low-temperature gas-liquid mixed fluid, which is introduced into the coil 14 via the refrigerant pipe 10 .
- the refrigerant sent to the coil 14 is vaporized using the heat generated by the current in the coil 14 as latent heat of vaporization. That is, the refrigerant evaporates inside the coil 14 and removes heat from the coil 14 .
- the refrigerant evaporated in the coil 14 then returns to the compressor 11 via the refrigerant pipe 10 and is compressed again. The above steps are then repeated. That is, a circulating flow of refrigerant for cooling the coil 14 is formed through the compressor 11, the condenser 12, the expansion valve 13, and the coil 14 as an evaporator in sequence.
- the refrigerant used in the refrigeration circuit 1 is, for example, hydrofluorocarbon, hydrofluoroolefin, carbon dioxide, or a mixed refrigerant thereof.
- the latent heat of evaporation of the refrigerant can be used to cool the coil 14 with high efficiency, and a strong magnetic field can be stably generated for a long period of time.
- the condenser 12 may be a gas cooler in which the refrigerant is not clearly condensed. That is, representative refrigerants HFC-32, HFC-404A, and other fluorocarbon-based refrigerants have condensability at temperatures of about -20 (° C.) to 42 (° C.), which is the operating environment of the normal condenser 12. .
- the condenser 12 is called a gas cooler because it operates in the supercritical region. Even if the condenser 12 is a gas cooler, it is a mechanism for cooling the refrigerant.
- FIG. 2 is a diagram showing a schematic configuration of the coil 14 of the refrigeration circuit 1.
- coil 14 is a member that generates a magnetic field by current flow, and is wound like a solenoid. Moreover, as described above, the coil 14 constitutes an evaporator of the refrigeration cycle.
- the coil 14 is formed by winding a long flat plate or the like made of a good conductor such as silver, aluminum, copper, or copper alloy in a coil shape.
- the coil 14 has a substantially rectangular cross section of a flat plate as a material thereof, and the long side direction of the cross section is the winding diameter direction of the coil 14, and the short side direction is the winding axial direction of the coil 14. It is wound in a substantially spiral shape. In other words, the coil 14 is wound so that the short side of the substantially rectangular cross section follows the substantially cylindrical shape.
- the coil 14 has a structure in which a plurality of fine through-holes 21, that is, microchannels, penetrate through the through-holes 21, and the coolant can flow through the through-holes 21.
- a plurality of fine through-holes 21 extending through the flat plate in the longitudinal direction are formed in the flat plate that is the material of the coil 14 . That is, the coil 14 is formed with a plurality of through holes 21 that serve as flow paths for the coolant.
- the coil 14 may be an induction coil.
- the voltage of the drive power source for the coil 14 is, for example, preferably 12 (V) to 440 (V), more preferably 12 (V) to 100 (V). This makes it possible to generate a suitable magnetic field according to the treatment site. For example, when an effective voltage of 50 (V) is applied to the coil 14 and a current of 100 (A) is applied, the DC resistance component of the coil 14 is 0.5 ( ⁇ ), and 5 ( kW).
- FIG. 3 is a ph diagram (pressure-specific enthalpy diagram) showing the state of cooling the coil 14 in the refrigeration circuit 1.
- FIG. 1 and 3 the refrigerant is compressed by the compressor 11 in the compression process S1 to a high pressure, and cooled by the condenser 12 in the heat release process S2. Next, the refrigerant is decompressed by the expansion valve 13 in the expansion process S3 and evaporated in the coil 14 to cool the coil 14 in the evaporation process S4.
- the hydrofluorocarbon refrigerant HFC-32 which is commonly used in air conditioners, evaporates at a temperature of 15 (° C.) inside the coil 14, and condenses at a temperature of 35 (° C.) inside the condenser 12.
- a refrigeration cycle is configured. That is, a refrigerating cycle is configured in which the evaporation temperature T1 of the refrigerant in the evaporation process S4 is 15 (°C) and the condensation temperature T2 of the refrigerant in the heat dissipation step S2 is 35 (°C).
- the coil 14 is supplied with a coolant and an electric current at the same time.
- electrodes 36 and 37 are provided near two ends of the coil 14 , ie, the inlet side 22 and the outlet side 23 , in order to pass current through the coil 14 .
- High-frequency current generator 35 has one output terminal connected to electrode 36 on inlet side 22 of coil 14 via wiring 38 and the other output terminal connected to electrode 37 on outlet side 23 of coil 14 via wiring 39 . It is connected.
- the refrigerant pipe 10, which constitutes the refrigerant path through which the refrigerant flows, is made of, for example, a copper pipe or a steel pipe. Since the refrigerant pipe 10 is made of a highly conductive material such as copper or iron, there is a risk that the current in the coil 14 may flow through the refrigerant path formed by the refrigerant pipe 10 . In that case, electric leakage to the driving devices such as the compressor 11 and the expansion valve 13 and to the outside of the refrigeration circuit 1 becomes a problem.
- FIG. 4 is a diagram showing the configuration near the end of the coil 14 in the refrigerating circuit 1. As shown in FIG. In order to solve the above-described problem of electric leakage, in the refrigeration circuit 1, the connecting portion 25 between the coil 14 and the refrigerant pipe 10 is connected via an insulating material 31, as shown in FIG.
- an insulating material 31 is provided between the coil side flange 27 that is the flange portion of the coil side joint 26 and the pipe side flange 29 that is the flange portion of the pipe side joint 28 . That is, the coil-side flange 27 and the pipe-side flange 29 are connected via the insulating material 31 .
- the insulating material 31 is made of, for example, a synthetic resin such as polytetrafluoroethylene (PTFE) having excellent insulating properties.
- the insulating material 31 may include a base material such as paper, cloth, and various synthetic fibers. Also, the insulating material 31 may be an insulating paint.
- the coil side joint 26 and the pipe side joint 28 are fixed by support members 33 such as bolts and nuts. Therefore, it is necessary to prevent current from flowing from the coil 14 to the refrigerant pipe 10 through the support member 33 .
- a coil-side insulating material 30 is provided between the coil-side flange 27 and the support member 33
- a pipe-side insulating material 32 is provided between the pipe-side flange 29 and the support member 33 .
- the coil-side insulating material 30 and the pipe-side insulating material 32 are made of synthetic resin or the like with excellent insulating properties. Also, the coil-side insulating material 30 and the pipe-side insulating material 32 may include base materials such as paper and cloth. By providing the coil-side insulating material 30 and the pipe-side insulating material 32 in this way, it is possible to prevent electric leakage via the support member 33 .
- the refrigeration circuit 1 can prevent current from flowing out of the coil 14 through the refrigerant pipe 10 to the outside. Therefore, a high current can be safely passed through the cooled coil 14, and a high-performance magnetic field can be safely generated.
- hydrofluorocarbons, hydrofluoroolefins, and carbon dioxide used as refrigerants have good insulating properties.
- carbon dioxide is a non-polar molecule, so it is a very useful refrigerant for this application.
- FIG. 5 is a diagram showing a schematic configuration of the coil 14 of the refrigerating circuit 1. As shown in FIG. 5(A) is a plan view, and FIG. 5(B) is a sectional view taken along line CC shown in FIG. 5(A). As shown in FIG. 5, the coil 14 is covered with an insulating material 24 over substantially the entire coil substrate 20 portion.
- the insulating material 24 is molded from a synthetic resin material such as ABS (acrylonitrile butadiene styrene), PP (polypropylene), or the like. Also, as the material of the insulating material 24, a ceramic material or the like may be used. Alternatively, the insulating material 24 may be formed by coating with an insulating paint. Since substantially the entire coil 14 is covered with the insulating material 24 in this way, it is possible to prevent the current from leaking from the coil 14 to the human body or surrounding structures.
- the coil 14 has a role as an evaporator of the refrigeration cycle. That is, the coolant evaporates while flowing through the coil 14 , thereby cooling the coil 14 .
- a typical prior art evaporator is a structure responsible for producing cold. In other words, a typical evaporator exists to create cold air, for example, like an air conditioner, or to make ice, like a refrigerator. Therefore, the conventional evaporator cannot play its role if the entire surface is covered like the coil 14 according to the present embodiment.
- the heat generated by the coil 14 itself should be removed by the refrigerant, and there is no need to cool the outside. Therefore, even if almost the entire surface of the coil 14 is covered with the insulating material 24, there is no problem. . As a result, the coil 14 can be efficiently cooled by the evaporating refrigerant, and magnetic force can be stably generated.
- FIG. 6 is a cross-sectional view showing the coil 14 of the refrigeration circuit 1.
- FIG. 6 shows a cross section of the coil substrate 20 of the coil 14 .
- the cross section of the coil 14, that is, the cross section of the coil base 20 is substantially rectangular.
- the coil 14 is formed from a plate-shaped coil base 20 .
- the short side of the cross section of the coil 14 may be formed in a curved shape such as, for example, a substantially circular arc shape.
- the coil 14 is formed by winding the short sides of a rectangular cross section along a substantially cylindrical shape. This constitutes a solenoid that generates a magnetic field. A large number of turns per unit length is desirable in order to generate a strong magnetic field in a substantially helically wound structure such as a solenoid.
- the coil 14 has a substantially rectangular cross section, and the length of the short side of the cross section, that is, the thickness t1 of the coil base 20 is formed small.
- the thickness t1 of the coil base material 20 is approximately 1 to 10 (mm), preferably approximately 3 (mm).
- the flow path of the coolant formed in the coil 14 having such a thin belt-like rectangular cross section, that is, the through hole 21 is a substantially circular fine hole having an inner diameter d1 of about 1 (mm).
- a compactly formed coil 14 that generates a strong magnetic field has fine through-holes 21 and cannot be conventionally cooled with water.
- the refrigerant has a much lower viscosity than water, and can generally easily flow through holes with an inner diameter d1 of about 1 (mm). Therefore, the coil 14 functions as an evaporator of the refrigeration cycle and utilizes the latent heat of vaporization of the refrigerant. As a result, high-performance magnetic field generation capability is obtained.
- the coil 14 is made of a good conductor such as silver, aluminum, copper, or copper alloy.
- the most preferable material for the coil 14 is copper or a copper alloy.
- coil bases 120, 220, 320, and 420 in which the form of the coil base 20 is changed will be described in detail with reference to FIGS. 7 to 10.
- FIG. 7 to 10 components other than the coil bases 120, 220, 320, and 420 showing the modified examples are the same as or similar to the already described embodiments, and thus the description thereof will be omitted.
- FIG. 7 is a cross-sectional view showing a coil base material 120 of a coil 14 according to another embodiment of the present invention, showing a cross section of the coil base material 20. As shown in FIG. As shown in FIG. 7, the through hole 121 may be formed to have a substantially rectangular cross section.
- the through hole 121 may be a substantially rectangular fine hole with a long side length, that is, a height h1 of about 1 (mm). Such a configuration also provides the same effect as the coil 14 formed from the coil base material 20 shown in FIG. In addition, a large heat transfer area of the evaporator can be ensured, and even better cooling performance can be obtained. As a result, excellent magnetic field generation capability is obtained.
- the through-hole 121 is not limited to the above-described shape, and may be, for example, another polygonal shape.
- FIG. 8 is a cross-sectional view showing a coil base material 220 of the coil 14 according to another embodiment of the invention. That is, FIG. 8 shows a cross section of the coil base 220. As shown in FIG. As shown in FIG. 8, through holes 221 are formed in a plurality of rows in the coil base 220 substantially along the long side of the cross section.
- the coil base material 220 has a configuration in which another coolant flow path, that is, the through hole 221 is formed between the through hole 221 serving as the coolant flow path and the outer wall surface of the coil base material 220. be. Even with such a configuration, the same effect as that of the coil base 20 shown in FIG. 6 can be obtained.
- the coil base 220 can have a larger surface area than the coil base 20 and the coil base 120 shown in FIG. That is, since the through-holes 221 of the coil base 220 are provided in a plurality of rows, the through-holes 21 of the coil base 20 (see FIG. 6) and the through-holes 121 of the coil base 120 (see FIG. 7) The total peripheral area is large.
- the coil base 220 is a member for passing a high-frequency current for generating a magnetic field.
- the current that generates the magnetic field tends to flow over the surface of the coil base 220 due to the skin effect of the high-frequency current. Therefore, a structure in which fine holes, that is, the through holes 221 are formed so as to increase the surface area is useful for improving the flow of high-frequency current and generating a strong electric field.
- the surface area is increased by forming the through-holes 221 as fine holes in multiple layers. There is an advantage that it can be suppressed to .
- the configuration in which the through holes 221 were formed in a plurality of rows would be disadvantageous from the viewpoint of heat transfer.
- the through-holes 221, which serve as coolant flow paths there is a gap between the through-holes 221, which serve as coolant flow paths, and the outer wall surface of the coil base 220, which serves as the surface to be cooled.
- a configuration in which the through-hole 221 is present cannot be adopted. This is because another through hole 221 existing between the through hole 221 and the outer wall surface of the coil base 220 inhibits heat transfer.
- the refrigerating circuit 1 is not intended to cool the outside, but cools the coil 14 that generates heat by generating a magnetic field. Therefore, as described above, the configuration of the coil base 220 in which the through holes 221 are formed in a plurality of rows can be adopted, thereby obtaining excellent magnetic field generation performance. That is, it is possible to obtain a compact refrigerating circuit 1 capable of stably generating a strong magnetic field for a long time. Although the arrangement of the through-holes 221 is substantially zigzag, it is also possible to employ other arrangements.
- FIG. 9 is a cross-sectional view showing a coil substrate 320 according to another embodiment of the invention.
- FIG. 9 shows a cross section of the coil substrate 320 of the coil 14.
- a coil base 320 has a plurality of rows of substantially triangular through holes 321 .
- a large number of substantially triangular through-holes 321 are arranged so that their sides are substantially parallel to each other.
- the coil base 320 may be arranged in such a manner that another through hole 321 exists between the through hole 321 and the outer wall surface of the coil base 320 .
- the through hole 321 of the coil base 320 can have a larger area than the through hole 221 of the coil base 220 . Therefore, a high-performance refrigerating circuit 1 capable of generating a magnetic field more efficiently can be obtained.
- the through-holes 321 have a substantially triangular cross-sectional shape, but the cross-sectional shape and arrangement of the through-holes 321 are not limited to this.
- the cross-sectional shape of the through-hole 321 may be square, rectangular, trapezoidal or other quadrangular, pentagonal, hexagonal, elliptical or any other shape. Also, various configurations can be adopted for the number of through-holes 321 arranged and the arrangement format.
- FIG. 10 is a cross-sectional view showing a coil base material 420 of the coil 14 according to another embodiment of the invention.
- FIG. 10 shows a cross section of the coil substrate 420.
- a coil base 420 has a configuration in which a plurality of circular tube portions 419 are joined.
- the circular pipe portions 419 have a substantially circular pipe shape, and each circular pipe portion 419 is formed with a through hole 421 having a substantially circular cross section.
- the coil base 420 has a form in which a plurality of circular tube portions 419 are joined in parallel. That is, the through holes 421 are arranged in the winding radial direction of the coil 14 in the cross section of the coil base 420 .
- a high-performance coil 14 is obtained that can generate a strong magnetic field at . Since the through-hole 421 has a substantially circular cross section, it can withstand high pressure when carbon dioxide is used as a coolant.
- circular pipe portions 419 may be joined together by brazing or the like after each is processed into a circular pipe shape. This facilitates the processing of the coil 14 and improves the productivity of the refrigerating circuit 1 .
- the through holes 421, that is, the circular tube portions 419 may be arranged in a line as shown in FIG. 10, or may be arranged in a plurality of lines (not shown). A total area of the through-holes 421 can be increased by providing the circular tube portions 419 in a plurality of rows. Therefore, the coil 14 can generate a magnetic field more efficiently.
- the cross section of the circular tube portion 419 may be circular, oval, elliptical, rectangular tube, or any other shape.
- this embodiment has the following features.
- cooling liquid of (1) is a hydrofluorocarbon or hydrofluoroolefin refrigerant, a single carbon dioxide refrigerant, or a mixture thereof.
- the coil 14 may be wound in a conical shape. As a result, the magnetic field generated inside the conical shape becomes larger than the current flowing through the coil 14 . Therefore, the current flowing through the coil 14 can be made relatively small, and the configuration of the refrigerating circuit 1 that cools the coil 14 can be simplified.
- the refrigeration circuit 1 has a structure and circuit configuration that can directly cool the coil 14 with the refrigerant. Therefore, even if a large current is passed through the coil 14, cooling suitable for generating a magnetic field can be efficiently performed, and a magnetic field generator capable of stably generating a predetermined magnetic field is realized.
- Refrigeration circuit 10 Refrigerant pipe 11
- Compressor 12 Condenser 13
- Expansion valve 14 Coils 20, 120, 220, 320, 420 Coil base material 21, 121, 221, 321, 421 Through hole 22
- Inlet side 23 Outlet side 24
- Insulating material 25 Connection portion 26
- Coil-side joint 27 Coil-side flange 28
- Pipe-side joint 29 Pipe-side flange 30
- Coil-side insulating material 31 Insulating material
- Support member 35 High-frequency current generator 36
- Electrode 38 Electrode 38
- Wiring 39 Wiring 419 Circular pipe Part d1 Inner Diameter t1 Thickness h1 Height T1 Evaporation Temperature T2 Condensation Temperature S1 Compression Process S2 Heat Dissipation Process S3 Expansion Process S4 Evaporation Process
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- Mechanical Engineering (AREA)
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- General Induction Heating (AREA)
Abstract
Description
このようにコイル14の略全体が絶縁材料24で覆われることにより、人体や周囲の構造物にコイル14から電流が漏れることを防止することができる。
なお、貫通孔121は、上記の形態に限定されるものではなく、例えば、その他の多角形状でも良い。
なお、貫通孔221の配列は、略千鳥状であるが、その他の配列形式を採用することも可能である。
なお、円管部419の断面は、円形の他、長円形、楕円形、角管状等その他の形状でも良い。
(1)狭い領域に冷却液を循環させることができる複数の微細孔としての貫通孔21、121、221、321、421が形成された断面形状のコイル14に電流と冷却液を流す構造。
10 冷媒配管
11 圧縮機
12 凝縮器
13 膨張弁
14 コイル
20、120、220、320、420 コイル基材
21、121、221、321、421 貫通孔
22 入口側
23 出口側
24 絶縁材料
25 接続部
26 コイル側継手
27 コイル側フランジ
28 配管側継手
29 配管側フランジ
30 コイル側絶縁材
31 絶縁材
32 配管側絶縁材
33 支持部材
35 高周波電流発生器
36 電極
37 電極
38 配線
39 配線
419 円管部
d1 内径
t1 厚み
h1 高さ
T1 蒸発温度
T2 凝縮温度
S1 圧縮過程
S2 放熱過程
S3 膨張過程
S4 蒸発過程
Claims (7)
- 冷媒配管を介して接続された圧縮機、凝縮器、膨張弁及び蒸発器を具備し、
前記蒸発器は、冷媒を流す複数の貫通孔が形成されたコイル基材がソレノイド状に巻かれたコイルから形成されており、
前記コイルは、磁界を発生することを特徴とする冷凍回路。 - 前記貫通孔は、前記コイル基材の断面において前記コイルの巻き径方向に並んでいることを特徴とする請求項1に記載の冷凍回路。
- 前記コイル基材は、断面が矩形状であり前記断面の長辺が前記コイルの巻き径方向を向くよう巻かれていることを特徴とする請求項1に記載の冷凍回路。
- 前記コイルは、絶縁材料で被覆されていることを特徴とする請求項1ないし請求項3の何れか1項に記載の冷凍回路。
- 前記コイルの入口側及び出口側に接続され交番電流を流す高周波電流発生器を具備することを特徴とする請求項1ないし請求項4の何れか1項に記載の冷凍回路。
- 前記コイルの入口側及び出口側の継手は、絶縁材を介して前記冷媒配管に接続されていることを特徴とする請求項1ないし請求項5の何れか1項に記載の冷凍回路。
- 前記冷媒としてハイドロフルオロカーボン、ハイドロフルオロオレフィン、二酸化炭素またはこれらの混合冷媒が用いられることを特徴とする請求項1ないし請求項6の何れか1項に記載の冷凍回路。
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US18/281,821 US20240151439A1 (en) | 2021-03-22 | 2021-07-30 | Freezing circuit |
JP2023508433A JPWO2022201574A1 (ja) | 2021-03-22 | 2021-07-30 |
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PCT/JP2021/028510 WO2022201574A1 (ja) | 2021-03-22 | 2021-07-30 | 冷凍回路 |
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US (1) | US20240151439A1 (ja) |
JP (1) | JPWO2022201574A1 (ja) |
WO (1) | WO2022201574A1 (ja) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0955322A (ja) * | 1995-08-11 | 1997-02-25 | Toshiba Corp | 変圧器 |
CN110975152A (zh) * | 2019-12-17 | 2020-04-10 | 华中科技大学 | 一种可连续工作的磁刺激装置及方法 |
-
2021
- 2021-07-30 JP JP2023508433A patent/JPWO2022201574A1/ja active Pending
- 2021-07-30 WO PCT/JP2021/028510 patent/WO2022201574A1/ja active Application Filing
- 2021-07-30 US US18/281,821 patent/US20240151439A1/en active Pending
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0955322A (ja) * | 1995-08-11 | 1997-02-25 | Toshiba Corp | 変圧器 |
CN110975152A (zh) * | 2019-12-17 | 2020-04-10 | 华中科技大学 | 一种可连续工作的磁刺激装置及方法 |
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