JP2010196910A - Cold box with refrigerator unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a cold box with a refrigerator unit, including a cool storage type refrigerator which compresses working gas by reciprocation of a piston for freezing, suppressing rapid temperature rise in the cold box even when the operation of the refrigerator is stopped, and having large energy saving effect. <P>SOLUTION: In the cold box 1 with the refrigerator unit cooled by a Stirling refrigerator 50, the Stirling refrigerator 50 brings a heat radiation fin 25, through which air sucked by a heat radiation fan 31 passes, into thermal contact with a heat radiation part 52 of the refrigerator 50, and circulates interior air, for cooling it, to a heat transfer member 20 provided in a cooling part 54 of the refrigerator 50 by a circulation fan 32 provided in a cold box body 10. When the operation of the Stirling refrigerator 50 is stopped, the operation of the Stirling refrigerator 50 and circulation fan 32 is stopped, while the operation of the heat radiation fan 31 is continued for a predetermined time. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a cold storage container with a refrigerator unit that cools the inside of a cold storage container using a regenerator type refrigerator such as a Stirling refrigerator or a Stirling pulse tube refrigerator.

  As a cold storage container with a refrigerator unit of the prior art, it is a refrigerator equipped with a Stirling refrigerator, and when the temperature Th of the Stirling refrigerator warm head exceeds the first reference temperature Th1, the heat dissipation fan is rotated. A refrigerator is disclosed in which the Stirling refrigerator is stopped when the output of the circulation pump is maximized and the temperature Th of the worm head still exceeds the second reference temperature Th2 (for example, see Patent Document 1). .)

  The cool box has a heat insulating container having an opening on the upper side, a Japanese-shaped frame having a first opening and a second opening in the opening, and a frame so as to cover the first opening. And a cooling unit including a sub lid on which a cooling subunit is attached so as to cover the second opening. The cooling subunit houses a Stirling refrigerator, a heat sink for exhaust heat that adheres to the exhaust heat section of the Stirling refrigerator and exhausts the heat of compression, a fan for air-cooling the heat sink for exhaust heat, and a Stirling refrigerator A casing that supports the fan and a Stirling refrigerator and a base portion that supports the casing and is provided on the sub lid. The endothermic part of the Stirling refrigerator protrudes from the base and is placed in the inside of the heat insulating container, and the heat sink for heat absorption is fixed, and the air in the room is forced to circulate through the heat sink for heat absorption by a fan provided in the heat sink for heat absorption. A cold storage for cooling the inside of the storage is disclosed. (For example, refer to Patent Document 2).

JP 2006-38384 A JP 2006-90665 A

  However, according to Patent Document 1, when the temperature Th of the worm head of the Stirling refrigerator exceeds the second reference temperature Th2, the Stirling refrigerator is stopped, and after the stop, the temperature of the worm head (heat radiating unit) increases. Is left without control. For this reason, when the refrigerator is stopped, the temperature of the worm head suddenly rises due to the remaining heat generated by the compression of the working gas during the operation of the refrigerator, and is transmitted from the worm head to the regenerator, expansion cylinder, displacer piston and working gas. Residual heat generated by compression enters the cold head (cooling section). Due to this intrusion heat, there is a problem that the temperature of the cold head rapidly rises and the internal temperature rises.

  According to Patent Document 2, when the Stirling refrigerator is in continuous operation, the heat of the compression section cools the exhaust heat sink provided in the exhaust heat section (heat radiating section) with air sucked by the fan. When the refrigerator is stopped, the fan is also stopped at the same time, so that there is a problem that the temperature of the heat absorption part (cooling part) rises rapidly and the internal temperature also rises as in Patent Document 1.

  Further, in Patent Documents 1 and 2, when the operation of the Stirling refrigerator is stopped, the temperature of the inside or the cold storage container rises rapidly, so that the temperature of the object to be cooled such as fish meat in the warehouse is a predetermined temperature in a short time. Since it becomes higher than the range, cooling by intermittent operation of the refrigerator cannot be performed. For this reason, even if the object to be cooled enters a supercooled state below a predetermined temperature range, the refrigerator must be operated continuously, and there is a problem that the energy saving effect is low.

  The present invention has been made in view of the above problems, and a cold storage container provided with a regenerative refrigerator such as a Stirling refrigerator or a Stirling pulse tube refrigerator that compresses a working gas by a reciprocating motion of a piston to generate refrigeration. Even if the operation of the refrigerator is stopped, the rapid temperature rise in the cold storage container can be suppressed, and the refrigerator is highly energy-saving by maintaining the interior stably in a predetermined temperature range while intermittently operating. The purpose is to provide a cold storage container.

  In order to solve the above-mentioned problem, the invention according to claim 1 radiates heat generated by the compression of the working gas, a cold insulation container main body having a cold insulation chamber, a compression part that compresses the working gas by the reciprocating motion of the piston. A heat storage unit, a cold storage unit that exchanges heat with the working gas, a cooling unit that cools the cold storage room, and an expansion unit that expands the working gas, and a heat storage unit that discharges heat from the heat dissipation unit And a heat means, and after a predetermined time has elapsed since the operation of the regenerative refrigerator is stopped, the operation of the heat exhaust means is stopped.

  In the invention according to claim 2, the regenerative refrigerator is configured such that the displacer piston inserted in the expansion side cylinder so as to be reciprocally movable or the expansion piston and the expansion cylinder form an expansion portion on the low temperature side of the expansion cylinder. A Stirling refrigerator or a Stirling-type pulse tube refrigerator that includes a pulse tube and a phase adjusting means that communicates with the high temperature side of the pulse tube and forms an expansion portion on the low temperature side of the pulse tube. .

  According to a third aspect of the present invention, the exhaust heat means is a fan that circulates air through a heat exchanger that is in thermal contact with the heat radiating portion.

  In addition, the invention according to claim 4 is a heat dissipating unit, a heat exchanger, air discharged from the heat exchanger, a compression unit, and at least one of the high temperature side higher than the ambient temperature of the regenerator. A temperature detecting means for measuring the temperature and a temperature detecting means for measuring the atmospheric temperature, the heat dissipating part, the heat exchanger, the air discharged from the heat exchanger, the compressing part, and the high temperature side of the regenerator. When the temperature difference between any one of the temperatures and the atmospheric temperature falls within a predetermined range, the fan operation is stopped.

  In the invention according to claim 5, the regenerative refrigerator is intermittently operated.

  In the first aspect of the present invention, the exhaust heat means is stopped after a lapse of a predetermined time since the operation of the regenerative refrigerator is stopped, so that the remaining heat generated by the compression of the working gas is exhaust heat. The heat is exhausted from the heat radiating part of the regenerative refrigerator. As a result, the temperature of the heat radiating portion gradually decreases without rapidly increasing, and the heat entering from the heat radiating portion to the cooling portion by heat conduction is reduced, so that the rapid temperature rise of the cooling portion is suppressed and the inside of the cold insulation container is also rapidly increased. Temperature rise is suppressed.

  Further, even if the operation of the cold storage type refrigerator is stopped, the rapid temperature rise is suppressed in the cold storage container, and the cold storage container can be intermittently operated to keep the cold storage container in a predetermined low temperature range for a long time. As a result, a cold storage container with a refrigerator unit having a large energy saving effect can be provided.

  In the invention according to claim 2, even if the Stirling refrigerator or Stirling pulse tube refrigerator, which is a regenerative refrigerator, is stopped, the remaining heat generated by the compression of the working gas is discharged. Heat is exhausted from the heat radiating portion by the heat means, and a rapid temperature rise is suppressed in the cold insulation container.

  In addition, even if the operation of the Stirling refrigerator or the Stirling type pulse tube refrigerator is stopped, a rapid temperature rise is suppressed in the cold container, so that sufficient operation stop time can be taken when the refrigerator is operated intermittently. Accordingly, the inside of the cold container can be maintained in a predetermined low temperature range for a long time, and the Stirling refrigerator and the Stirling type pulse tube refrigerator have high efficiency, so that the energy saving effect of the cold container with the refrigerator unit is improved.

  In the invention according to claim 3, the heat radiating portion is exhausted from heat exchange in which the remaining heat generated by the compression of the working gas is in thermal contact with the heat radiating portion due to the air sucked by the fan or the pressure-fed air. Be heated. As a result, the rapid rise in temperature of the heat radiating part is suppressed, and the heat entering from the heat radiating part to the cooling part by heat conduction is reduced, so that the rapid rise in temperature of the cooling part is suppressed and the inside of the cold insulation container also rises rapidly. Is suppressed. Further, the cold storage container can be operated intermittently to keep the inside of the cold storage container in a predetermined low temperature range for a long time, and a cold storage container with a refrigerator unit having a large energy saving effect can be provided. Furthermore, since a fan is used as the heat exhausting means, the configuration is simple and the cost is low.

  In the invention according to claim 4, the temperature at any one of the heat radiation part, the heat exchanger, the air discharged from the heat exchanger, the compression part, and the high temperature side higher than the atmospheric temperature of the regenerator. When the temperature difference from the atmosphere enters a predetermined range, the fan operation is stopped. Thereby, even if the temperature of the atmosphere changes, the fan can be stopped at an appropriate timing, and a rapid temperature rise in the cold insulation container is suppressed. Also, when the refrigerator is operated intermittently, the fan stop timing is appropriate, so that the energy saving effect of the cold container with the refrigerator unit is improved.

  Further, in the invention according to claim 5, the cold storage type refrigerator is intermittently operated and keeps the inside of the cold storage container and the object to be cooled (for example, fresh food such as fish meat) in a predetermined low temperature range for a long time. it can. As a result, a cold storage container with a refrigerator unit having a large energy saving effect can be provided.

It is a perspective view of the cold storage container with a refrigerator unit concerning Example 1 of the present invention. It is explanatory drawing of the cold storage container with a refrigerator unit in the AA cross section of FIG. It is explanatory drawing of the Stirling refrigerator of FIG. It is an operation pattern figure of the Stirling refrigerator of FIG. 1, the fan for heat dissipation, and the fan for circulation in a store | warehouse | chamber. It is a figure which shows the measured temperature of each part of the cold storage container with a refrigerator unit of a prior art. It is a figure which shows the estimated temperature of each part of the cold storage container with a refrigerator unit of this invention. It is explanatory drawing of the Stirling type pulse tube refrigerator with which the cold storage container with a refrigerator unit of this invention is equipped. It is the elements on larger scale of the cold storage container with a refrigerator unit concerning Example 2 of the present invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a perspective view of a cold storage container with a refrigerator unit according to Embodiment 1 of the present invention. FIG. 2 is an explanatory view of a cold storage container with a refrigerator unit in the AA cross section of FIG. As shown in FIG. 2, the cold storage container 1 with a refrigerator unit includes a cold storage container body 10, a Stirling refrigerator 50 (cold storage type refrigerator), a heat transfer member 20 having heat transfer fins 21, and heat radiation fins 25 ( A heat exchanger), a heat radiating fan 31 (exhaust heat means), a circulation fan 32 in the cabinet, and a control device 40.

The cold insulation container main body 10 is a rectangular parallelepiped box (FIG. 1), and houses a lid 12 that can be opened and closed on the upper surface, an interior 13 (cold insulation room) for storing an object to be cooled (not shown), and a Stirling refrigerator 50. A machine room 16 for carrying out the operation and an electric room 17 for housing the control device 40. The interior 13 is formed by being surrounded by a heat insulating wall 11 made of a heat insulating material having a high heat insulating property such as a vacuum heat insulating material and a lid 12 made of the same heat insulating material as the heat insulating wall 11. The heat insulating wall 11 is composed of wall members 11 a to 11 f and a part of the heat insulating wall 14. The machine room 16 is formed by being surrounded by the wall members 11c, 11d, 11e, and 11f of the heat insulating wall 11 and the heat insulating walls 14 and 15, and is adjacent to the interior 13 with the wall member 11d interposed therebetween.

  The Stirling refrigerator 50 is disposed in the machine room 16 by fixing the radiating fins 25 in thermal contact with the radiating unit 52 to the wall member 11 d and the heat insulating wall 14. And the cooling part 54 is arrange | positioned so that it may become downward with respect to the thermal radiation part 52 in the hollow part 13a of the store | chamber interior 13 on the boundary of the wall member 11c.

  The heat dissipating fan 31 is disposed in a hole 14 a provided in the heat insulating wall 14. Air sucked by the heat dissipating fan 31 is sucked from the air inlet 14b provided in the heat insulating wall 14, passes through the heat dissipating fins 25, and is discharged from the machine room 16 to the atmosphere by the heat dissipating fan 31 (FIG. 1). Thick solid arrows).

  The heat transfer member 20 is fixed to the cooling unit 54. The heat transfer member 20 includes a block 22 that extends horizontally from the lower portion of the cooling unit 54 toward the interior 13 and protrudes, and a plurality of heat transfer fins 21 that stand up from the extended tip side. A circulation fan 32 is provided in the cabinet 13 above the heat transfer fins 21. The circulation fan 32 circulates the air in the interior 13 as shown by the thick broken line arrows in FIG. 1 to improve the heat exchange between the heat transfer fins 21 and the object to be cooled (not shown).

  The control device 40 is disposed in the electric chamber 17 provided on the heat insulating wall 15, and the Stirling refrigerator 50, the heat radiation fan 31, the circulation fan 32, and the connector 45 are respectively connected to the wires 41, 42, 43, It is connected to the control device 40 via 44. The connector 45 is provided outside the cold storage container 1 with a refrigerator unit, and is connected to a power source (not shown).

  FIG. 3 is an explanatory diagram of the Stirling refrigerator of FIG. As shown in FIG. 3, the Stirling refrigerator 50 includes a compression unit 51, a heat radiation unit 52, a cold storage unit 53, a cooling unit 54, and an expansion unit 55 in communication with each other, and helium is used as a working gas. Filled. The compression part 51 is surrounded and formed by a compression piston 56 (piston), a displacer piston 57 (piston) and a rod 60, a compression cylinder 58, and a displacer cylinder 59. The compression piston 56 is connected to a linear motor (not shown) and the rod 60 penetrates, and the displacer piston 57 is connected via the rod 60 to a flexure bearing (not shown) having an elastic function and a support function. The expansion portion 55 is formed to be surrounded by a displacer piston 57, a displacer cylinder 59 (expansion side cylinder), and a head portion 61a of the case 61.

  The heat dissipating part 52 is configured by fixing a fin member 52a obtained by bending a thin corrugated sheet such as copper into a cylindrical shape on the inner peripheral surface of the upper cylindrical part 61b of the case 61. Similarly, the cooling unit 54 is also configured by fixing a fin member 54a obtained by bending a thin corrugated plate such as copper into a cylindrical shape on the inner peripheral surface of the lower cylindrical portion 61c of the case 61. As described above, the radiating fins 25 are fixed to the outer peripheral surface of the heat radiating portion 52, that is, the outer peripheral surface of the upper cylindrical portion 61b, and the heat transfer member is attached to the outer peripheral surface of the cooling portion 54, that is, the outer peripheral surface of the lower cylindrical portion 61c. 20 is fixed. The cold storage part 53 is configured by filling the cold storage element 53a inside the intermediate part 61d of the case 61 between the upper cylindrical part 61b and the lower cylindrical part 61c. Thereby, the reciprocating helium and the regenerator element 53a exchange heat.

  The Stirling refrigerator 50 includes a displacer piston 57. The displacer piston 57 is a displacer type Stirling refrigerator in which the front surface 57a side of the displacer piston 57 functions as an expansion piston and the back surface 57b side functions as a compression piston. An expansion piston type Stirling refrigerator instead of (not shown) may be used. In this case, the front side of the expansion piston functions as an expansion piston, a substantially constant working gas pressure acts on the back side, and the expansion piston is connected to driving means such as a linear motor.

  Next, the operation and effect of the cold insulating container 1 with a refrigerator unit according to the first embodiment of the present invention will be described. FIG. 4 is an operation pattern diagram of the Stirling refrigerator, the heat dissipating fan and the circulation fan in FIG. 1, and the operation pattern is programmed in the control device 40 in advance. In the figure, (a) shows the operating condition of the Stirling refrigerator 50, (b) shows the operating condition of the heat dissipating fan 31, and (c) shows the operating condition of the circulating fan 32. In addition, the air of the following description is the flow which passes the radiation fin 25 by the fan 31 for heat dissipation, and the air | atmosphere of the following description is the stagnation air around the cold storage container 1 with a refrigerator unit. As shown in FIG. 4, at the time t1, the Stirling refrigerator 50, the heat dissipation fan 31, and the circulation fan 32 are started to operate simultaneously. The compression piston 51 and the displacer piston 57 reciprocate to compress the helium in the compression section 51, thereby generating compression heat. This compression heat is transmitted from the heat radiating portion 52 to the air sucked from the air inlet 14b by the heat radiating fan 31 through the heat radiating fins 25, passes through the machine room 16 and is released to the atmosphere from the heat radiating fan 31. The On the other hand, the cooling unit 54 cools the heat transfer member 20 when helium that has expanded at the expansion unit 55 and has reached a low temperature (for example, approximately −25 ° C.) passes through the cooling unit 54. Then, the internal air is forcibly circulated by the circulation fan 32 so that the internal air passes through the heat transfer fins 21 (for example, approximately −22 ° C.) of the cooled heat transfer member 20. As a result, forced circulation air is cooled, and the interior 13 and the object to be cooled (not shown) in the interior 13 are cooled to a low temperature (for example, approximately −18 ° C.).

  When the time t2 (FIGS. 4A and 4C) is reached, the operation of the Stirling refrigerator 50 and the operation of the circulation fan 32 are stopped simultaneously, but the heat dissipation fan 31 continues to the time t3 ( The operation is continued until FIG. When the Stirling refrigerator 50 is shut down, the remaining heat generated by the compression of helium is exhausted by the air sucked by the heat dissipating fan 31 that passes through the heat dissipating fins 25 in the heat dissipating portion 52. Therefore, immediately after the operation of the Stirling refrigerator 50 is stopped, the temperature of the heat dissipating section 52 does not rapidly increase, and the temperature gradually decreases and the temperature reaches substantially the atmospheric temperature at time t3. Thereby, the rapid rise in the temperature of the heat radiating part 52 is suppressed, and the cold storage part 53 (the intermediate part 61d of the case 61 and the cold storage element 53a), the displacer cylinder 59, the displacer piston 57, and helium are interposed from the heat radiating part. Thus, the heat that enters the cooling unit 54 due to heat conduction decreases, and a rapid temperature rise of the cooling unit 54 is suppressed. As a result, heat transferred to the circulating air by the circulation fan 32 in the cabinet 13 passing through the heat transfer fins 21 through the blocks 22 and the heat transfer fins 21 of the heat transfer member 20 (residual generated by compression) Heat) is also suppressed. Therefore, the rapid increase in temperature of the inside 13 of the cold insulation container body 10 and the object to be cooled is also suppressed.

  In addition, by suppressing the rapid temperature rise of the cooling unit 54 described above, it is possible to maintain the temperature of the interior 13 in a predetermined low temperature range for a long time even when the Stirling refrigerator 50 is intermittently operated. . Thereby, the object to be cooled (for example, fresh food such as fish meat) in the cold insulation container main body 10 and the cold insulation container main body 10 can be maintained in a predetermined low temperature range for a long time while the Stirling refrigerator 50 is intermittently operated. As a result, the cold storage container 1 with a refrigerator unit having a large energy saving effect can be provided. Furthermore, since the Stirling refrigerator 50 has high efficiency, the energy saving effect of the cold container 1 with the refrigerator unit is improved. Note that the intermittent operation of the refrigerator and the resumption of the refrigerating operation are programmed in the control device in advance, and the intermittent operation is performed based on this program. Alternatively, a temperature sensor (not shown) is provided in the cold insulation container main body 10, and when the temperature in the refrigerator 13 becomes equal to or lower than the predetermined temperature, the operation of the Stirling refrigerator 50 and the circulation fan 32 is stopped, and the temperature becomes higher than the predetermined temperature. Then, an intermittent operation for resuming the operation of the Stirling refrigerator 50 and the circulation fan 32 is performed. Any intermittent operation may be used.

  Further, by using the heat radiating fan 31 as the heat exhausting means, the structure of the heat exhausting means is simple and the cost is reduced without adding a special device.

FIG. 5 is a diagram showing measured values of temperatures of respective parts of a conventional cold storage container with a refrigerator unit. FIG. 6 is a diagram showing the estimated temperature of each part of the cold storage container with a refrigerator unit according to the present embodiment. Table 1 is a comparison table of the temperature rise of each part of this example and the prior art when 173 minutes have elapsed after the Stirling refrigerator 50 is stopped (FIGS. 5 and 6).

  As shown in FIGS. 5 and 6, the Stirling refrigerator 50 is started, and the refrigerator is stopped at a time of about 307 minutes. At this time, the measured temperature value in the center of the chamber in the prior art is -20 ° C, and the expected temperature in the center of the chamber in this example is -18.7 ° C. In the prior art of FIG. 5, the heat dissipating fan 31 and the circulation fan 32 are stopped simultaneously with the stop of the refrigerator. In this embodiment of FIG. 6, the cooling fan 32 is stopped when the refrigerator is stopped, but the heat dissipating fan 31 continues to operate. Table 1 shows the present example and the prior art of the temperature rise of each part at the time when 173 minutes have elapsed after the refrigerator is stopped (time 480 minutes in FIGS. 5 and 6). As shown in Table 1, the temperature difference (ΔT1−ΔT2) between the rising portions of the conventional technology and the present embodiment is 6.3 ° C. for the cooling portion 54, 5.8 ° C. for the heat transfer fins 21, and for circulation. The outlet of the fan 32 is 7.4 ° C., and the center of the interior 13 is 2.6 ° C., both of which are lower than the prior art. Therefore, it can be seen that the Stirling refrigerator 50 and the circulation fan 32 are stopped and the heat radiation fins 25 are kept in operation, so that the temperature of each part of the cold insulation container body 10 can be kept at a low temperature for a long time.

  Note that the regenerator type refrigerator used in the cold storage container 1 with the refrigerator unit of the present embodiment is the Stirling refrigerator 50 including the displacer cylinder 59 and the displacer piston 57. The displacer cylinder 59 and the displacer piston 57 are Alternatively, a Stirling type pulse tube refrigerator using a pulse tube and phase adjusting means may be used. That is, as shown in FIG. 7, the Stirling type pulse tube refrigerator 70 (cold storage type refrigerator) sequentially includes a compression unit 81 of the compressor 80, a heat radiation unit 72, a cold storage unit 73, a cooling unit 74, The expansion part 91 formed in the low temperature side of the pulse tube 90 is connected and comprised.

  The compressor 80 includes a cylinder 82, a pair of opposingly arranged compression pistons 83 (pistons) inserted into the cylinder 82, a linear motor 84 that reciprocates the compression piston 83 (piston), a compression piston 83, and the linear motor 84. And a flexure bearing 86 provided on both ends of the rod 85 and having an elastic support function. A compression portion 81 is formed surrounded by the cylinder 82 and the pair of compression pistons 83.

  A gas piston 92 (represented by a two-dot chain line in FIG. 7) that reciprocates within the pulse tube 90 is formed in the pulse tube 90. An expansion portion 91 is formed on the low temperature side of the pulse tube 90 by the pulse tube 90 and the gas piston 92. A phase adjusting means 94 is connected to the high temperature end of the pulse tube 90 via a radiator 93. The phase adjusting means 94 includes a buffer tank 96 and an inertance tube 95 made of a long tube, and the phase adjusting means 94 acts so that the phase of the gas piston 92 is advanced by about 90 degrees from the compression piston 83. Thereby, the compression unit 81 and the expansion unit 91 act in the same manner as the compression unit 51 and the expansion unit 55 of the Stirling refrigerator 50 of FIG. 3, respectively, compress helium by the compression unit 81, and expand by the expansion unit 91. To cool. The compression heat generated by the compression unit 81 and the compression heat due to the expansion work of the expansion unit 91 by exhaust heat means such as a fan are respectively passed through heat radiation fins (not shown) that are in thermal contact with the heat radiation unit 72 and the heat radiator 93. Heat is dissipated. The cooling unit 74 cools the inside of the cold insulation container main body 10 (FIG. 1) by refrigeration generated in the expansion unit 91 through heat transfer fins of a heat transfer member that is in thermal contact with the cooling unit 74 (not shown). In addition, the Stirling pulse tube refrigerator 70 has high efficiency like the Stirling refrigerator 50. As described above, the cold storage container with the refrigerator unit using the Stirling type pulse tube refrigerator 70 has the same effect as the cold storage container 1 with the refrigerator unit using the Stirling refrigerator 50.

  The radiator 93 may be a radiator on the outer peripheral surface of the pulse tube 90 on the high temperature end side. In this case, the phase adjusting means 94 is connected to the high temperature end of the pulse tube 90.

  In the first embodiment, when the operation of the cold storage container 1 with the refrigerator unit is stopped, the operation of the Stirling refrigerator 50 and the operation of the circulation fan 32 are stopped simultaneously, and the heat dissipation fan 31 is continuously operated. The operation of the Stirling refrigerator 50 may be stopped and the operation of the circulation fan 32 and the heat dissipation fan 31 may be continued. In this case, the circulation fan 32 is stopped earlier than the operation stop of the heat dissipation fan 31. That is, immediately after the Stirling refrigerator 50 is stopped, the heat absorbing portion 54 and the heat transfer member 20 are lower than the internal temperature. At this time, air is forcibly circulated by a circulation fan 32 to improve heat transfer between the circulation air and the heat transfer fins 21 and between the circulation air and the cold insulation container body 10 and the object to be cooled. The air, the cold insulation container main body 10 and the object to be cooled are cooled. Thereby, the cold / heat generated in the expansion part 55 can be utilized effectively. Then, when the internal temperature becomes higher than the heat transfer member 20, the circulation fan 32 is stopped in order to reduce the heat transfer of the air in the internal space 13 and suppress the rapid increase in the internal temperature. When the circulation fan 32 is stopped, the heat generated by the compression still remains on the high temperature side of the compression unit 51, the heat radiation unit 52, the heat radiation fin 25, and the cold storage unit 53. Will continue driving.

  FIG. 8 is a partially enlarged explanatory view of the cold storage container with a refrigerator unit according to the second embodiment of the present invention. The same parts and the same parts as those of the cold storage container 1 with the refrigerator unit in FIG. As shown in FIG. 8, the cold storage container 2 with the refrigerator unit is provided with temperature sensors 46 and 47 (temperature detection means) on the heat radiation fin 25 and the outer surface of the cold storage container body 10, respectively, and the temperature sensors 46 and 47 are wired respectively. It connects to the control apparatus 40 via 48,49. The other configuration is the same as that of the cold container 1 with the refrigerator unit of FIG.

  A temperature sensor 46 provided on the radiation fin 25 measures the temperature of the radiation fin 25, and a temperature sensor 47 provided on the outer surface of the cold insulation container body 10 measures the temperature of the atmosphere. When the operation of the cold storage container 2 with the refrigerator unit is stopped, the operation of the Stirling refrigerator 50 and the operation of the circulation fan 32 are stopped at the same time as in the case of the cold storage container 1 with the refrigerator unit. The fan 31 is continuously operated. And even if atmospheric temperature changes, since the thermal radiation fan 31 will be stopped if the temperature difference of the thermal radiation fin 25 and air | atmosphere enters into the predetermined range, suppression of the rapid temperature rise of the inside 13 will improve. In addition, when the Stirling refrigerator 50 is intermittently operated, the energy saving effect of the cold storage container 2 with the refrigerator unit is improved because the operation stop timing of the cooling / dissipating fan 31 is appropriate. Other effects are the same as those of the cold storage container 1 with a refrigerator unit in FIG.

  In Example 2, the operation of the fan 31 is stopped when the temperature difference between the radiating fin 25 and the atmosphere enters a predetermined range, but the radiating portion 52, the air discharged from the radiating fin 25, the compression portion 51, The operation of the fan 31 may be stopped when the temperature difference between at least one temperature measurement value on the high temperature side higher than the atmospheric temperature of the high regenerator 53 and the measurement value of the atmospheric temperature falls within a predetermined range. Further, the temperature sensor 47 may measure the temperature of the air flowing into the heat radiating fins 25.

  The cold storage container with a refrigerator unit according to the present invention is used for a cooler box for storing fresh food and the like.

1, 2 Cold storage container with refrigerator unit 10 Cold storage container body 13 Inside (cold storage room)
25 Heat dissipation fin (heat exchanger)
31 Fan (heat exhaust means)
46, 47 Temperature sensor (temperature detection means)
50 Stirling refrigerator (cool storage type refrigerator)
51, 81 Compression unit 52, 72, 93 Heat radiation unit 53, 73 Cold storage unit 54, 74 Cooling unit 55, 91 Expansion unit 56, 83 Compression piston (piston)
57 Displacer Piston (Piston)
59 Displacer cylinder (expansion side cylinder)
70 Stirling type pulse tube refrigerator (cool storage type refrigerator)
90 Pulse tube 94 Phase adjustment means

Claims (5)

A cold container body having a cold room;
A compressor that compresses the working gas by reciprocating motion of the piston, a heat radiating part that dissipates heat generated by the compression of the working gas, a cold storage part that exchanges heat with the working gas, a cooling part that cools the cold insulation chamber, and an operation A regenerative refrigerator composed of an expansion section where gas expands;
An exhaust heat means for exhausting heat from the heat radiating part,
A cold storage container with a refrigerator unit, characterized in that the operation of the exhaust heat means is stopped after a predetermined time has elapsed since the operation of the cold storage type refrigerator was stopped. The regenerative refrigerator is a Stirling refrigerator that forms the expansion portion on the low temperature side of the expansion cylinder with a displacer piston or expansion piston inserted into the expansion cylinder so as to be able to reciprocate, and the expansion cylinder, or A Stirling-type pulse tube refrigerator that includes a pulse tube and a phase adjusting unit that communicates with a high temperature side of the pulse tube and that forms the expansion portion on a low temperature side of the pulse tube. The cold storage container with a refrigerator unit according to claim 1. The cold storage container with a refrigerator unit according to claim 1 or 2, wherein the exhaust heat means is a fan that circulates air through a heat exchanger in thermal contact with the heat radiating unit. Temperature detection that measures the temperature of at least one of the heat radiating section, the heat exchanger, the air discharged from the heat exchanger, the compression section, and the high temperature side higher than the ambient temperature of the regenerator. Means, and temperature detecting means for measuring the atmospheric temperature,
The temperature difference between the temperature of the heat radiating part, the heat exchanger, the air exhausted from the heat exchanger, the compression part, the high temperature side of the regenerator, and the atmospheric temperature 4. The cold storage container with a refrigerator unit according to claim 3, wherein the operation of the fan is stopped when the temperature enters a predetermined range. 5. The cold storage container with a refrigerator unit according to any one of claims 1 to 4, wherein the cold storage type refrigerator is operated intermittently.

Images