JP2004333015A - Cooling device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cooling device for very low temperature capable of reducing the manufacturing cost and performing the efficient cooling. <P>SOLUTION: This cooling device comprises a compressor 2a having the cylindrical outer shape, and an integrated radiator 3a for the compressor, having a cylindrical inner face same as the compressor. The integrated radiator 3a for the compressor has groups of fins composed of parallel fins of high concentration on a plurality of parts of its outer face, and has a clearance part for separating a part of the circumference, and a fastening part 34 for fixing, on its lower part. As a clearance of the clearance part can be adjusted on the basis of a screwing state of a screw 36 to the fastening part 34 for fixing, the radiator can be easily fitted to the compressor 2a, and can be easily and surely adhered and fixed to the compressor 2a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a refrigeration apparatus that cools various sensors, communication devices, and the like to extremely low temperatures using a small refrigerator.
[0002]
[Prior art]
When the infrared sensor or the magnetic sensor is cooled to an extremely low temperature such as the temperature of liquid nitrogen, the detection sensitivity is improved. Therefore, it is expected that the use of these sensors in combination with a small refrigerator for generating cryogenic temperature and the application of these sensors to night vision devices for disaster prevention and security, biomagnetic measurement devices, and the like will be expanded in the future. In addition, when the communication device is cooled to such a very low temperature, its noise-to-noise ratio is improved, so that the size and loss of the device can be reduced. Therefore, a cooling device using a small refrigerator having such a cooling performance is also effective for improving the performance of mobile communication and submillimeter wave and millimeter wave communication devices. For these reasons, in recent years, the development of a cooling device using a small refrigerator capable of cooling various sensors, communication devices, and the like to extremely low temperatures near the temperature of liquid nitrogen has been actively promoted.
[0003]
5 and 6 show the configuration of the upper portion of a conventional example of such a cooling device. FIG. 5 is a front view of the inside of the housing, and FIG. 6 is a side view of the inside of the housing.
The housing 1 has a rain-proof structure for outdoor installation, and the inside of the housing 1 is vertically divided by a partition plate 6. FIGS. 5 and 6 are views showing only a portion above the partition plate 6. The refrigerator for generating a cryogenic temperature is composed of the compressor 2, the expander 4, and a vacuum vessel (not shown) arranged below the expander 4, and a power supply unit for operating and controlling these, and Although not shown, the control section is housed in a space below the partition plate 6. A sensor or the like to be cooled is stored in a vacuum container.
[0004]
In particular, the compressor 2 and the expander 4, which generate a large amount of heat, are arranged in a space above the partition plate 6, and seven compressors are provided on the outer surface of the compressor 2 in order to suppress a rise in temperature due to the generated heat. The heat radiating unit 3 is mounted, and a pair of expander radiators 5 is mounted on the outer surface of the expander 4. In order to improve the transfer of heat to the compressor heat radiating unit 3, a polyhedron having a regular octagonal cross section perpendicular to the axial direction is provided at an axially central portion of the outer surface of the compressor 2 (a portion where the amount of heat dissipated is particularly large). A heat radiation unit 3 for a compressor having fins with high density is formed on each of the seven sides except the lower side of the polyhedral shape part 21 via a heat transfer material such as heat transfer grease. It is attached by a screw 31. A wind tunnel 7 is disposed over the heat radiating means so as to effectively circulate outside air for cooling to these heat radiating means. Is arranged. The lengths of the fins of the compressor radiator unit 3 and the expander radiator 5 are the same as the axial direction of the compressor 2, and the wind tunnel 7 has openings on both sides in this direction. The wind tunnel 7 also has a function of suppressing the heat from the housing 1 whose temperature rises due to direct sunlight or the like from further entering the inside.
[0005]
As described above, in this type of cooling device, as a device in which a compressor or the like having a large calorific value is separately arranged to forcibly cool them, for example, Japanese Patent Application Laid-Open No. 2001-304711 discloses One is known (see Patent Document 1).
[0006]
[Patent Document 1]
Prior Patent Document: Japanese Patent Application Laid-Open No. 2001-304711
[Problems to be solved by the invention]
Since the compressor of the cryogenic refrigerator is small and has a relatively large heat value, the density of the fins of the heat radiating means is maximized in order to effectively dissipate the heat value. In the above-described conventional cooling device, the external shape of the compressor is made into a polyhedral shape, and a heat radiating unit having parallel fins capable of increasing the fin density is attached to each surface with a screw. However, processing the external shape of the compressor into a polyhedral shape and drilling screw holes there requires a lot of processing man-hours, and often fixing each heat dissipation unit separately to the polyhedral shape portion with screws. Requires assembling man-hours.
[0008]
It is an object of the present invention to provide a cryogenic cooling device which does not require many processing steps and assembling steps as described above, has a low manufacturing cost, and can be efficiently cooled.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is configured such that a refrigerator including a compressor, an expander, and a vacuum container for storing a cooled body, and a power supply unit and a control unit for controlling the operation thereof are housed in the same housing. A cooling device comprising a compressor having a cylindrical outer shape as the compressor, and a radiator of the compressor having an inner surface having a diameter equivalent to the diameter of the cylindrical outer shape of the compressor. The outer surface thereof has a plurality of radiating fins parallel to the central axis of the cylindrical outer shape, and has a space portion parallel to the center axis at a lower portion thereof, and a space outside both ends sandwiching the space portion. An integrated compressor radiator made of a material having excellent thermal conductivity is provided with a fixing fastening portion for adjusting the width of the portion.
[0010]
Since the outer shape of the compressor is cylindrical, the outer shape processing of the compressor is a simple lathe processing, and the number of processing steps of the compressor is greatly reduced. In addition, the shape of the inner surface of the radiator is made cylindrical to match the outer shape of the compressor, and there is an interval parallel to the central axis at the lower part of the radiator, outside the both ends sandwiching this interval. Since the fixing fastening part for adjusting the width of the gap is provided, it is easy to mount the radiator on the compressor by widening the gap, and the width of the gap is narrowed. Thereby, the inner surface of the radiator can be pressed against and adhered to the outer surface of the compressor to fix the radiator in a state of good heat conduction, and the heat generated by the compressor can be efficiently transmitted to the fins. The width of the gap can be easily adjusted by, for example, adjusting the tightening degree of the screw of the fastening portion for fixing. Further, since the radiator is integrated, the number of steps for mounting the radiator can be reduced.
[0011]
The invention according to claim 2 is characterized in that the radiating fins are at least two sets of fin groups parallel to a horizontal plane arranged above and below the horizontal plane including the central axis, and the fin group includes the central axis and is arranged with respect to the horizontal plane. And four groups of fins parallel to two surfaces having a 45-degree inclination.
Since the heat radiation fins are configured by arranging a plurality of fin groups in a parallel arrangement that can be easily processed and can increase the fin density, a radiator for a compressor having fins with a high fin density can be obtained. . In addition, since the cross-sectional shape perpendicular to the axial direction of the space in which the compressor is disposed is a square or a rectangle, when fin groups composed of parallel fins are disposed The number of fins that can be formed can be increased by approximating the shape of the envelope at the tip of the as close as possible. However, considering the required flexibility of the radiator, it is most practical to make the envelope an octagon. Of the octagons, expanders are arranged on the lower surface of the compressor, so fin groups can not be arranged, and fins may not be arranged on the upper surface due to size restrictions, so at least both sides in the horizontal direction The fins are arranged at four positions in a direction inclined by 45 degrees from the horizontal.
[0012]
BEST MODE FOR CARRYING OUT THE INVENTION
The features of the cooling device according to the present invention are that the outer shape of the compressor is machined into a cylindrical shape, and that the radiator for the compressor has a cylindrical inner surface and is fitted to the outer surface of the compressor. That is, it is an integrated radiator that is tightly fixed to the compressor by tightening the gap.
Hereinafter, embodiments of the cooling device according to the present invention will be described in more detail using examples.
The parts having the same functions as those of the prior art are denoted by the same reference numerals.
[0013]
1 and 2 show an upper configuration of an embodiment of a cooling device according to the present invention. FIG. 1 is a front view of the inside of a housing, and FIG. 2 is a side view of the inside of the housing. 6 and FIG.
The housing 1 has a rain-proof structure for outdoor installation, and the inside of the housing 1 is vertically divided by a partition plate 6. FIGS. 1 and 2 are views showing only a portion above the partition plate 6. The refrigerator for generating a cryogenic temperature is composed of the compressor 2a, the expander 4, and a vacuum vessel (not shown) arranged below the expander 4, and a power supply unit for operating and controlling them, and Although not shown, the control section is housed in a space below the partition plate 6. A sensor or the like to be cooled is stored in a vacuum container.
[0014]
In particular, the compressor 2a and the expander 4, which generate a large amount of heat, are arranged in a space above the partition plate 6, and an outer surface of the compressor 2a is provided on the outer surface of the compressor 2a for suppressing an increase in temperature due to generated heat. A radiator 3 a is mounted, and a pair of expander radiators 5 is mounted on the outer surface of the expander 4. In order to allow the outside air for cooling to flow through these heat radiating means effectively, a wind tunnel 7 is arranged so as to cover the outside of the heat radiating means, and one end of the wind tunnel 7 is for sucking outside air for cooling into the wind tunnel 7. A fan 8 is provided. The length of the fins of the integrated compressor radiator 3a and the expander radiator 5 is the same as the axial direction of the compressor 2, and the wind tunnel 7 has openings on both sides in this direction. The wind tunnel 7 also has a function of suppressing the heat from the housing 1 whose temperature rises due to direct sunlight or the like from further entering the inside.
[0015]
3A and 3B show the structure of the radiator 3a for an integrated compressor of the embodiment, wherein FIG. 3A is a side view and FIG. 3B is a front view. FIGS. 4A and 4B show a method of mounting the integrated compressor radiator 3a on the compressor 2a. FIG. 4A is a front view showing a mounting direction, and FIG. 4B is a front view showing a mounted state.
As shown in FIG. 4A, the outer shape of the compressor 2a is a cylindrical shape that is most easily processed. The integrated-type compressor radiator 3a is made of aluminum or copper having high thermal conductivity, and is integrally formed by drawing with a mold. On its outer surface, there are two fin groups of 10 side fins which are parallel to the horizontal plane including the central axis of the cylinder and are arranged above and below it, and two surfaces which include the central axis of the cylinder and are inclined by 45 degrees from the horizontal plane. And four upper diagonally arranged fin groups which are parallel to the vertical plane including the center axis of the cylinder and are arranged on both sides thereof. The groups are integrated by a base 32. The inner surface of the base 32 has a cylindrical shape conforming to the outer shape of the compressor 2a. In FIG. 3A, the above-mentioned fin group is generally referred to as a fin portion 33. Further, the integrated compressor radiator 3a has, at the lower portion thereof, an interval portion 35 for separating a part of the circumference in the length direction, and connects the expanders 4 on both ends sandwiching the interval portion 35. Outside the portion, there is provided a fixing fastening portion 34 for adjusting the interval of the interval portion 35 to fit the inner surface of the integrated compressor radiator 3a to the cylindrical outer surface of the compressor 2a so as to closely adhere and fix it. ing. The distance between the opposed fixing fastening portions 34 is adjusted by screws 36.
[0016]
As shown in FIG. 4A, when the integrated compressor radiator 3a is fitted to the outside of the compressor 2a, the screw 36 is loosened to facilitate the fitting. After the fitting is completed as shown in FIG. 4 (b), the screw 36 is tightened, and the inner surface of the integrated compressor radiator 3a is brought into close contact with and fixed to the cylindrical outer surface of the compressor 2a. At the time of this fitting, a heat transfer material such as heat transfer grease is applied to the contact surface to reduce the thermal resistance as much as possible. As is apparent from this description, in the case of this embodiment, the operation of mounting the radiator on the compressor is extremely simple, and an excellent heat conduction state is obtained between the two.
[0017]
In the above embodiment, the fins are also arranged on the upper part of the radiator. However, when the size of the device is limited, the fins are eliminated and the upper surface of the radiator is brought into contact with the wind tunnel to radiate heat to the wind tunnel. It is also effective to have the function of the fin.
[0018]
【The invention's effect】
According to the first aspect of the present invention, since the outer shape of the compressor is a cylindrical shape, the outer shape processing of the compressor is simple lathe processing, and the number of processing steps of the compressor is greatly reduced. In addition, the shape of the inner surface of the radiator is made cylindrical to match the outer shape of the compressor, and there is an interval parallel to the central axis at the lower part of the radiator, outside the both ends sandwiching this interval. Since the fixing fastening part for adjusting the width of the gap is provided, it is easy to mount the radiator on the compressor by widening the gap, and the width of the gap is narrowed. Thereby, the inner surface of the radiator can be pressed against and adhered to the outer surface of the compressor to fix the radiator in a state of good heat conduction, and the heat generated by the compressor can be efficiently transmitted to the fins. Further, since the radiator is integrated, the number of steps for mounting the radiator can be reduced.
[0019]
Therefore, according to the present invention, since the number of processing steps and the number of assembling steps are reduced, it is possible to provide a cryogenic cooling device that can be efficiently cooled at a low manufacturing cost.
According to the second aspect of the present invention, since the heat radiation fins are formed by arranging a plurality of fin groups in a parallel arrangement that are easy to process, a radiator for a compressor having fins with a high fin density is obtained. be able to. In addition, since the cross-sectional shape perpendicular to the axial direction of the space in which the compressor is disposed is a square or a rectangle, when a fin group including parallel fins is disposed in this shape, By making the envelope as close as possible to its shape, the number of fins that can be formed can be increased. However, considering the required flexibility of the radiator, it is most practical to make the envelope an octagon. Of the octagons, a fin group cannot be arranged because an expander is arranged on the lower surface of the compressor, and fins may not be arranged on the upper surface due to size restrictions, so at least both sides in the horizontal direction The fin groups are arranged at four positions in a direction inclined by 45 degrees from the horizontal.
[0020]
Therefore, according to the present invention, it is possible to obtain a cooling device that can cool the most efficiently practically.
[Brief description of the drawings]
FIG. 1 is an internal front view of an upper portion of a cooling device according to an embodiment of the present invention. FIG. 2 is an internal side view of an upper portion of the cooling device showing an embodiment of a cooling device according to the present invention. (A) is a side view, (b) is a front view, and (a) shows a method of mounting the compressor radiator of the embodiment to the compressor. FIG. 5B is a front view showing a mounted state. FIG. 5 is a front view showing an example of a structure of a conventional cooling device. FIG. Internal side view of the upper part of the device showing an example structure [Explanation of reference numerals]
DESCRIPTION OF SYMBOLS 1 Housing 2, 2a Compressor 21 Polyhedral shape part 3 Radiator unit 31 for compressor Thread 3a Radiator for integrated compressor 32 Base part 33 Fin part 34 Fastening part for fixing 35 Interval part 36 Screw 4 Expander 5 Expander Radiator 6 Partition plate 7 Wind tunnel 8 Fan

Claims (2)

A refrigerator including a compressor, an expander, and a vacuum container that stores a body to be cooled, and a power supply unit and a control unit that control the operation of the refrigerator and a cooling device configured to be housed in the same housing,
With a compressor having a cylindrical outer shape as the compressor,
As a radiator of this compressor, the inner surface is a cylindrical shape having a diameter equivalent to the diameter of the cylindrical outer shape of the compressor, and a plurality of radiating fins parallel to the central axis of the cylindrical outer shape are formed on the outer surface thereof. It has an interval parallel to the central axis at its lower part, and has a fixing fastening portion for adjusting the width of the interval outside the both ends sandwiching the interval, and has excellent heat conductivity. Equipped with an integrated compressor radiator made of material,
A cooling device characterized by the above-mentioned. The radiating fins are at least two sets of fin groups parallel to a horizontal plane arranged above and below a horizontal plane including the central axis, and two fin groups including the central axis and having a 45 degree inclination with respect to the horizontal plane. And four sets of fins parallel to one surface,
The cooling device according to claim 1, wherein:

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