JP2010085365A - Environmental testing apparatus and coldness storage device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an environmental testing apparatus having a coldness storage device with high cold reserving ability, and to provide a coldness storage device. <P>SOLUTION: The temperature of a low-temperature tank 6 is lowered to a pre-cooling temperature of -75°C. At this time, an ethanol aqueous solution whose freezing point is -70°C in a coldness storage device 20 freezes. Thereafter, the apparatus shifts the step to a low-temperature exposure step of controlling the air in a test area 7 and the air in the low-temperature tank 6 to a low-temperature exposure temperature of -65°C. When the temperature becomes higher than -70°C in the process of changing the temperature of the low-temperature tank 6 from the pre-cooling temperature to the low-temperature exposure temperature, the ethanol aqueous solution starts to melt. Therefore, the calorie absorbed by the ethanol aqueous solution is increased because the melting heat is available in addition to the stored heat of heat capacity. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an environmental test apparatus that performs a durability test by repeatedly heating and cooling a device under test.

In order to evaluate the durability against temperature changes of electronic parts and electronic devices, an environmental test apparatus as disclosed in Patent Document 1 is provided. The environmental test apparatus disclosed in Patent Document 1 includes a first test environment in which the test environment is adjusted to a high temperature and a second test environment in which the temperature is lower than that of the first test environment. It is possible to switch to multiple test environments including
JP 2007-333559 A

  The low temperature test tank of the environmental test apparatus is provided with a regenerator for increasing the heat capacity of the evaporator and the low temperature test tank in order to adjust the ambient temperature to a low temperature. Such a regenerator usually has a structure in which a plurality of plate-like aluminums are connected with a spacer interposed therebetween, and performs heat exchange with air. However, such a regenerator has a problem that the regenerator capacity is not high although the environmental test apparatus is enlarged by providing the regenerator.

  An object of the present invention is to provide an environmental test apparatus and a regenerator equipped with a regenerator having a high regenerative power.

  An environmental test apparatus according to the present invention communicates a low temperature bath internally provided with a cooling mechanism for cooling air and a regenerator, a test area for containing a test sample for environmental testing, and the low temperature bath and the test area. A damper that can be opened and closed so as to be in a communicating state and a non-communicating state, and the air in the test area and the low-temperature tank is circulated when the damper is in the communicating state. And a control means for controlling the low-temperature tank, the blower, and the damper, wherein the control means is configured such that when the regenerator is in the communication state, The damper is set so that the air in the test area and in the low-temperature tank has a low-temperature exposure temperature that is an equilibrium temperature, and when the damper is in the non-communication state, the pre-cooling temperature is lower than the low-temperature exposure temperature. The low-temperature tank and the blower are controlled, and the regenerator includes a tube and a regenerator material enclosed in the tube, and the regenerator material includes the low-temperature exposure temperature and the pre-cooling temperature. It is characterized by having a freezing point between.

  According to said structure, since the said cool storage material has a freezing point between the said low temperature exposure temperature and the said precooling temperature, when the said cool storage device changes from the said precooling temperature to the said low temperature exposure temperature, the said cool storage material is When the regenerator is at the precooling temperature, it is solidified, but begins to melt in the process of changing the regenerator to the low temperature exposure temperature. Therefore, the cold storage material can use the heat of fusion in addition to the heat storage amount corresponding to the heat capacity, and the amount of heat absorbed is increased. Therefore, an environmental test apparatus including a regenerator having a high regenerative power is provided.

  In addition, the environmental test apparatus of the present invention further includes a high-temperature tank provided with a heater for increasing the temperature of air, and the low-temperature tank further includes a heater for increasing the temperature of air. It is desirable. According to this, the temperature in the test area can be rapidly changed by the high temperature tank and the low temperature tank. Therefore, it is possible to perform a test in an environment where the temperature changes more drastically.

  The cold storage material is preferably an ethanol aqueous solution, a methanol aqueous solution, or an ethylene glycol aqueous solution. According to this, since the ethanol aqueous solution, the methanol aqueous solution, or the ethylene glycol aqueous solution has a freezing point between the low temperature exposure temperature and the precooling temperature, the regenerator changes from the precooling temperature to the low temperature exposure temperature. Thus, the aqueous solution is solidified when the regenerator is at the precooling temperature, but starts to melt in the process of changing the regenerator to the low temperature exposure temperature. Therefore, the aqueous solution can use the heat of fusion in addition to the heat storage amount corresponding to the heat capacity, and the amount of heat absorbed is increased. Therefore, an environmental test apparatus including a regenerator having a high regenerative power is provided.

  Moreover, as for the said cool storage material, it is desirable that the alcohol concentration in aqueous solution is 70 to 85 wt%, or the ethylene glycol concentration is 60 to 75 wt%.

  The regenerator preferably further includes fins provided around the tube. According to this, the outer surface area of the regenerator is increased, and the heat exchange performance with air can be improved.

  A preferred embodiment of the present invention will be described below with reference to FIGS.

  FIG. 1 is a cross-sectional view showing the overall configuration of an environmental test apparatus 1 according to an embodiment of the present invention, in which a high-temperature tank damper 52 described later is in a non-communication state and a low-temperature tank damper 62 is in a non-communication state. It is a figure when it becomes. FIG. 2 is a diagram of the environmental test apparatus 1 when the high-temperature tank damper 52 is in a non-communication state and the low-temperature tank damper 62 is in a communication state. FIG. 3 is a diagram of the environmental test apparatus 1 when the high-temperature tank damper 52 is in communication and the low-temperature tank damper 62 is in non-communication.

  As shown in FIG. 1, the environmental test apparatus 1 is provided in the main area 3, a subarea 2 located on the right side in FIG. 1, a main area 3 located on the left side in FIG. 1 and adjacent to the subarea 2. And a high-temperature tank blower 11 and a low-temperature tank blower 12 arranged so as to extend from the sub area 2 to the main area 3 through the holes, and a controller 50 for controlling the operation of the apparatus 1. The high-temperature tank blower 11 includes a motor 11b, a fan 11a driven by the motor 11b, and a shaft portion 11c connecting the motor 11b and the fan 11a. The low-temperature tank blower 12 includes a motor 12b, a fan 12a driven by the motor 12b, and a shaft portion 12c connecting the motor 12b and the fan 12a.

  A motor 11b of the high-temperature tank blower 11 is disposed above the subarea 2, and a motor 12b of the low-temperature tank blower 12 is disposed below the subarea 2. A controller 50 is disposed at the bottom of the sub-area 2.

  The main area 3 is provided with a heat insulating wall 4 so as to be a frame of the main area 3. That is, the main area 3 is defined by the heat insulating wall 4. In the heat insulating wall 4, in order from the top, a high-temperature tank 5 for increasing the temperature inside, a test area 7 for storing a test sample for environmental testing, and a low-temperature tank 6 for decreasing the temperature inside are in the vertical direction. It is arranged to be stacked. A heat insulating plate 8 is provided at the boundary between the high temperature bath 5 and the test area 7, and the heat insulating plate 8 penetrates in the thickness direction between the heat insulating plate 8 and the heat insulating wall 4 in the left-right direction in FIG. Each of the elongated holes 3a is formed. That is, the heat insulating plate 8 is isolated from the heat insulating wall 4 in the left-right direction in FIG. 1, and the high temperature bath 5 and the test area 7 are in communication with each other through the long hole 3a. Similarly, a heat insulating plate 9 is provided at the boundary between the low temperature bath 6 and the test area 7, and the heat insulating plate 9 is formed between the heat insulating plate 9 and the heat insulating wall 4 in the left-right direction in FIG. Long holes 3b penetrating in the vertical direction are formed. That is, the heat insulating plate 9 is isolated from the heat insulating wall 4 in the left-right direction in FIG. 1, and the low-temperature tank 6 and the test area 7 are in communication with each other through the long hole 3b.

  The heat insulating wall 4 has a protruding portion 4a that slightly protrudes in each long hole 3a at a height at which the heat insulating plate 8 is positioned, and slightly in each long hole 3b at a height at which the heat insulating plate 9 is positioned. It has the protrusion part 4b which protrudes.

  Furthermore, the high-temperature tank damper 52 is arrange | positioned so that the long hole 3a between the heat insulation board 8 and the protrusion part 4a may each be covered. The high-temperature tank damper 52 can be opened and closed so as to close and open the long hole 3a, and has a role of insulating the high-temperature tank 5 and the test area 7 by closing the long hole 3a. The high-temperature tank damper 52 is in a communication state (see FIG. 3) in which the long hole 3a is opened to allow the high-temperature tank 5 and the test area 7 to communicate with each other, and the long hole 3a is closed. And a non-communication state (see FIGS. 1 and 2). Moreover, the low temperature tank damper 62 is each arrange | positioned so that the long hole 3b between the heat insulation board 9 and the protrusion part 4b may each be covered. Similarly, the low temperature tank damper 62 can be opened and closed so as to close and open the long hole 3b, and has a role of insulating the low temperature tank 6 and the test area 7 by closing the long hole 3b. The low-temperature tank damper 62 is in a communication state (see FIG. 2) in which the long hole 3b is opened to allow the low-temperature tank 6 and the test area 7 to communicate with each other, and the long hole 3b is closed and the low-temperature tank 6 and the test area 7 are closed. And a non-communication state (see FIGS. 1 and 3).

  In the test area 7, room temperature exposure dampers 72 are provided near both ends in the left-right direction in FIG. 1. The room temperature exposure damper 72 is provided on the heat insulating wall 4 on the back side of the paper surface in the test area 7 and closes and opens the intake port and the exhaust port (not shown) that allow the test area 7 and the outside of the environmental test apparatus 1 to communicate with each other. It can be opened and closed. That is, the normal temperature exposure damper 72 is in a communication state in which the test area 7 and the outside of the environmental test apparatus 1 are in communication with each other via the intake port and the exhaust port, and in a non-communication state in which the test area 7 is not in communication. be able to. Further, a non-illustrated normal temperature exposure blower is provided outside the environmental test apparatus 1 and has a role of mixing outside air and air in the test area 7 when the normal temperature exposure damper 72 is in communication.

  The high-temperature tank 5 is provided with two heaters 51 for increasing the temperature in the tank. Further, in the high-temperature tank 5, a fan 11a of the high-temperature tank blower 11 is disposed in the vicinity of the right heat insulating wall 4 in FIG. The fan 11a is connected to the motor 11b in the sub area 2 through a shaft portion 11c inserted in a hole provided in the right heat insulating wall 4 in FIG. The fan 11a circulates the air in the high-temperature tank 5 when the high-temperature tank damper 52 is in a non-communication state as shown in FIGS. 1 and 2, and when the high-temperature tank damper 52 is in a communication state as shown in FIG. Moreover, it has a role which mixes the air in the high-temperature tank 5 and the air in the test area 7. In addition, a ventilation intake port 53 and an exhaust port 54 are arranged on the heat insulation wall 4 on the back side of the paper in the high-temperature tank 5, and the air in the high-temperature tank 5 and the outside air can be exchanged by opening and closing a damper (not shown). It has become.

  The low-temperature tank 6 includes an evaporator 63, a regenerator 20, and three heaters 61. The evaporator 63 is connected to a refrigerator (not shown) arranged outside, and the temperature of the low-temperature tank 6 can be lowered by using heat of vaporization when a refrigerant (not shown) is evaporated. In this embodiment, which will be described later, when the low-temperature tank damper 62 is in communication, the temperature of the low-temperature tank 6 is the temperature of the cold air to which the test object is exposed in the test area 7, and the inside of the test area 7 and the low-temperature tank 6. The inside air is at a low temperature, which is the equilibrium temperature. Further, in order to change the air in the test area 7 to the low temperature exposure temperature in a short time, the precooling temperature lower than the low temperature exposure temperature is set when the low temperature tank damper 62 is not in communication. The heater 61 is for increasing the temperature in the tank, and can be adjusted by the heater 61 so that the temperature of the low temperature tank 6 does not become lower than the low temperature exposure temperature or the precooling temperature. Details of the regenerator 20 will be described later.

  Further, in the low-temperature tank 6, a fan 12a of a low-temperature tank blower 12 is disposed in the vicinity of the right heat insulating wall 4 in FIG. The fan 12a is connected to a motor 12b in the sub area 2 via a shaft portion 12c inserted into a hole provided in the right heat insulating wall 4 in FIG. 1 and 3, the fan 12a circulates the air in the low-temperature tank 6 when the low-temperature tank damper 62 is in a non-communication state, and when the low-temperature tank damper 62 is in a communication state as shown in FIG. In addition, it has a role of mixing the air in the low temperature bath 6 and the air in the test area 7.

  Next, the details of the regenerator 20 will be described with reference to FIG. The regenerator 20 is configured to meander and has an inner hollow hollow fin 21, a fin 22 spirally wound around the tube 21, and an aqueous ethanol solution sealed in the tube 21. And have. Accordingly, it can be said that the outer fin fin 21 is finned. The fin 22 is made of aluminum having a large specific heat or the like, and is stored by the cooled air in the low-temperature tank 6. The structure of the fin 22 is to increase the outer surface area in order to improve the heat exchange performance with air. The ethanol aqueous solution is enclosed as a cold storage material for storing cold heat. Therefore, the ethanol aqueous solution is stored cold by the air in the cooled low temperature tank 6 like the fins 22.

また、図５は、エタノール水溶液の濃度と凍結温度（凝固点）との関係を示したグラフである。本実施形態におけるエタノール水溶液は、濃度が８２ｗｔ％のものであって、その凝固点は−７０℃である。 As described above, when the air in the low-temperature tank 6 is cooled to the low temperature by the evaporator 63, the regenerator 20 also has the low temperature. Moreover, when the air in the low temperature tank 6 is cooled to the precooling temperature, the regenerator 20 also becomes the precooling temperature. The aqueous ethanol solution is adjusted to have a freezing point between the low temperature exposure temperature and the precooling temperature. The relationship between the concentration of the aqueous ethanol solution and the freezing temperature (freezing point) is shown in Table 1 below.

FIG. 5 is a graph showing the relationship between the concentration of the aqueous ethanol solution and the freezing temperature (freezing point). The ethanol aqueous solution in this embodiment has a concentration of 82 wt%, and its freezing point is −70 ° C.

  Accordingly, when the air in the low-temperature tank 6 is cooled to the precooling temperature and then the low temperature exposure temperature is changed, the regenerator 20 also changes from the precooling temperature to the low temperature exposure temperature, and the aqueous ethanol solution is solidified when the regenerator 20 is at the precooling temperature. However, the regenerator 20 starts to melt in the process of changing to a low temperature exposure temperature. Accordingly, the ethanol aqueous solution can use the heat of fusion in addition to the heat storage amount corresponding to the heat capacity, and thus the amount of heat absorbed is increased.

The environmental test apparatus 1 is controlled by the controller 50. That is,
High temperature tank damper 52, low temperature tank damper 62, room temperature exposure damper 72, high temperature tank blower 11, low temperature tank blower 12, room temperature exposure blower, heater 51, regenerator 20, evaporator 63, and heater 61 Are all controlled by the controller 50.

  Next, an operation example of the environmental test apparatus 1 will be described with reference to FIG. FIG. 6 is a graph showing the temperature changes of the high-temperature tank 5, the test area 7, and the low-temperature tank 6 over time according to the present embodiment. In this embodiment, the precooling temperature is -75 ° C and the low temperature exposure temperature is -65 ° C. As described above, the freezing point of the aqueous ethanol solution is -70 ° C.

  First, in order to set the temperature of the test area 7 to approximately room temperature, the high-temperature tank damper 52 is set in a non-communication state and the low-temperature tank damper 62 is set in a non-connection state as shown in FIG. To do. And the fan 11 for high temperature tanks, the fan 12 for low temperature tanks, and the fan for normal temperature exposure which is not shown in figure are started.

  Further, the temperature of the high-temperature tank 5 is raised by the heater 51 in the high-temperature tank 5, and the temperature of the low-temperature tank 6 is lowered to the precooling temperature of −75 ° C. by the evaporator 63 in the low-temperature tank 6. At this time, since the high-temperature tank damper 52 is not in communication, the air in the high-temperature tank 5 circulates in the direction of the arrow in the high-temperature tank 5 in FIG. Similarly, since the low-temperature tank damper 62 is not in communication, the air in the low-temperature tank 6 circulates in the direction of the arrow in the low-temperature tank 6 in FIG. Further, since the room temperature exposure damper 72 is in communication, the outside air and the air in the test area 7 are mixed. As described above, the temperature of the test area 7 is approximately room temperature.

  In the process of changing the temperature of the low-temperature tank 6 to the precooling temperature, when the temperature becomes −70 ° C. or lower, the ethanol aqueous solution having a freezing point of −70 ° C. is solidified. That is, when the temperature of the low temperature tank 6 is the precooling temperature, the ethanol aqueous solution is solidified.

  When the temperature of the high temperature tank 5 reaches a predetermined temperature and the temperature of the low temperature tank 6 reaches the precooling temperature, the process proceeds to a low temperature exposure stage. That is, as shown in FIG. 2, the normal temperature exposure damper 72 is brought into a non-communication state and the low temperature bath damper 62 is brought into a communication state, whereby the air in the test area 7 and the air in the low temperature bath 6 are brought to an equilibrium temperature. To. As described above, in this embodiment, the low-temperature exposure temperature, which is the equilibrium temperature, is set to −65 ° C.

  More specifically, air is circulated in the direction indicated by the arrows in the test area 7 and the low-temperature tank 6 by setting the room temperature exposure damper 72 in a non-communication state and setting the low-temperature tank damper 62 in a communication state. The air in the test area 7 and the air in the low temperature tank 6 are mixed. As a result, the temperature of the test area 7 which is normal temperature is drastically lowered, and the temperature of the low temperature tank 6 which is the precooling temperature is increased to become the low temperature exposure temperature which is the equilibrium temperature.

  In the process where the temperature of the low-temperature tank 6 changes from the pre-cooling temperature to the low-temperature exposure temperature, when the temperature becomes higher than -70 ° C, the aqueous ethanol solution starts to melt. Accordingly, the ethanol aqueous solution can use the heat of fusion in addition to the heat storage amount corresponding to the heat capacity, and thus the amount of heat absorbed is increased. As an example, when the temperature of the regenerator changes from a precooling temperature of −75 ° C. to a low temperature exposure temperature of −65 ° C., the conventional regenerator absorbs 350 kJ of heat, whereas the regenerator 20 according to the present invention has 1350 kJ. It is known to absorb the amount of heat.

  Then, when the air in the test area 7 and the air in the low-temperature tank 6 reach a low temperature, the heater 61 is controlled so as not to fall below the low temperature, and the low temperature is maintained for a predetermined time.

  Thereafter, the process proceeds to a high temperature exposure stage. That is, as shown in FIG. 3, the temperature of the test area 7 is raised by setting the high-temperature tank damper 52 in a communication state and setting the low-temperature tank damper 62 in a non-communication state. More specifically, the high-temperature tank damper 52 is brought into a communication state, and the low-temperature tank damper 62 is brought into a non-communication state, whereby air is circulated in the direction indicated by the arrows in the test area 7 and the high-temperature tank 5 to perform the test. The air in the area 7 and the air in the high temperature tank 5 are mixed. As a result, the temperature of the test area 7 that has been the low temperature exposure temperature rapidly increases and the temperature of the high temperature tank 5 decreases, and the air in the test area 7 and the air in the high temperature tank 5 become the equilibrium temperature.

  At this time, the temperature of the low temperature tank 6 is again lowered to the precooling temperature of −75 ° C. by the evaporator 63. Therefore, the ethanol aqueous solution is solidified again.

  Thereafter, the process proceeds to the low temperature exposure stage again. Thus, the temperature of the test area 7 can be raised and lowered by repeating the low temperature exposure stage and the high temperature exposure stage. Therefore, it is possible to perform a durability test by placing a test object in the test area 7.

  According to this embodiment described above, the following effects can be obtained.

  Since the aqueous ethanol solution has a freezing point between the low-temperature exposure temperature and the pre-cooling temperature, the regenerator 20 changes from the pre-cooling temperature to the low-temperature exposure temperature, so that the aqueous ethanol solution is solidified when the regenerator 20 is at the pre-cooling temperature. However, the regenerator 20 starts to melt in the process of changing to a low temperature exposure temperature. Accordingly, the ethanol aqueous solution can use the heat of fusion in addition to the heat storage amount corresponding to the heat capacity, and the amount of heat absorbed is increased. Therefore, the environmental test apparatus 1 provided with the cool storage 20 with high cool storage power is provided.

  Next, with reference to FIG. 7, a modified embodiment in which the above embodiment is modified will be described. However, components having the same configuration as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate. FIG. 7 is a diagram showing an environmental test apparatus 101 according to the present modification.

  The environmental test apparatus 101 includes a main area 103 for performing an environmental test, a low-temperature tank blower 12 disposed so as to extend from the outside of the apparatus 101 to the low-temperature tank 6 in the main area 103, and the apparatus 101. And a controller 150 for controlling the operation.

  In the main area 103, a heat insulating wall 104 is provided so as to be the frame. That is, the main area 103 is defined by the heat insulating wall 104. In the heat insulating wall 104, a test area 7 for placing an environmental test specimen is arranged on the left side in FIG. 7, and a low temperature bath 6 for lowering the inside is arranged on the right side. Further, similarly to the environmental test apparatus 1, a heat insulating plate 9 is provided at a boundary portion between the low temperature bath 6 and the test area 7, and between the heat insulating plate 9 and the heat insulating wall 104 in the vertical direction in FIG. 7. Long holes 3b are formed through the heat insulating plate 9 in the thickness direction. That is, the heat insulating plate 9 is isolated from the heat insulating wall 104 in the vertical direction in FIG. 7, and the low temperature tank 6 and the test area 7 are in communication with each other through the long hole 3b.

  In addition, as with the environmental test apparatus 1, the heat insulating wall 104 has a protruding portion 4b that slightly protrudes into each of the long holes 3b at the height at which the heat insulating plate 9 is located, and the heat insulating plate 9 and the protruding portion 4b. The low temperature tank dampers 62 are respectively arranged so as to cover the long holes 3b between them. The low-temperature tank damper 62 can be opened and closed so as to close and open the long hole 3b. The low-temperature tank damper 62 opens the long hole 3b and allows the low-temperature tank 6 and the test area 7 to communicate with each other. It can be in a non-communication state in which the hole 3b is closed and the low-temperature tank 6 and the test area 7 are made non-communication.

  A shelf 107 is provided in the center of the test area 7 to accommodate a test article for environmental testing. The test object can be put into the shelf 107 from the outside of the apparatus 101 through a door (not shown).

  The other elements in the test area 7 and the low temperature chamber 6 of the environmental test apparatus 101 are the same as those in the environmental test apparatus 1.

  As described above, the high-temperature tank 5, the test area 7, and the low-temperature tank 6 are provided in the main area 3 of the environmental test apparatus 1, whereas the environmental test apparatus 101 includes the test area 7 and A cryogenic bath 6 is provided. In this case, the controller 150 controls the environmental test apparatus 101 so that the temperature in the test area 7 suddenly changes from the normal temperature to the low temperature test temperature by changing the low temperature bath damper 62 from the non-communication state to the communication state at the start of the test. Is possible. Therefore, it is possible to evaluate the durability of the test object by shortening the time for changing the temperature of the test area from room temperature to low temperature.

  Next, with reference to FIG.8 and FIG.9, the modification of a regenerator is demonstrated easily. However, components having the same configuration as those of the above-described embodiment are denoted by the same reference numerals and description thereof is omitted as appropriate.

  In the above-described embodiment, the regenerator 20 has the erotic fin tube 21, but may have the tube 31 instead. The tube 31 is configured to meander and has a hollow inside, and the overall shape is the same as that of the tube 21. FIG. 8 is a partial cross-sectional view of the tube 31, and is a cross-sectional view along a horizontal direction of a portion of the tube 21 corresponding to the broken line portion of FIG. 4. That is, the tube 31 is different from the tube 21 in that the inner wall surface meanders with the outer wall surface in the same phase.

  The regenerator 20 may have a tube 41 instead of the erotic fin tube 21. The tube 41 is configured to meander and has a hollow inside, and the overall shape is the same as that of the tube 21. FIG. 9A is a partial plan view of the tube 41, and shows a portion corresponding to the broken line portion of FIG. FIG. 9B is a cross-sectional view taken along line VIIIB-VIIIB in FIG. That is, the tube 41 is different from the tube 21 in that the peripheral surface has irregularities so that the cross section along the line has a star shape as shown in FIG.

  According to these two modifications, it is possible to prevent the tube from being ruptured easily due to the solidification and expansion of the ethanol aqueous solution.

  The embodiment described above, its modified form, and the modification of the regenerator are examples of the embodiment of the present invention, and the present invention is not limited to such a configuration.

  For example, in this embodiment, the low temperature exposure temperature is set to -65 ° C and the precooling temperature is set to -75 ° C, but these can be changed as appropriate. Furthermore, in this embodiment, the freezing point of the ethanol aqueous solution is set to −70 ° C., but the freezing point of the ethanol aqueous solution is not limited to this. That is, the aqueous ethanol solution only needs to have a freezing point between the low temperature exposure temperature and the precooling temperature.

  Furthermore, in this embodiment, although ethanol aqueous solution was used as a cool storage material, a cool storage material is not restricted to this. For example, an aqueous methanol solution or an aqueous ethylene glycol solution may be used. When the cold storage material is an ethylene glycol aqueous solution, the ethylene glycol concentration in the aqueous solution is desirably 60 to 75 wt%.

  The environmental test apparatus 1 according to the present embodiment operates to repeat the low temperature exposure stage and the high temperature exposure stage, and is referred to as normal temperature exposure between the low temperature exposure stage and the high temperature exposure stage. You may operate | move so that a process may be performed temporarily. That is, after the low temperature exposure stage, the low temperature tank damper 62 is disconnected, the high temperature tank damper 52 is disconnected, and the normal temperature exposure damper 72 is connected, so that the outside air and the test area 7 can be communicated. The step of mixing the air and raising the temperature in the test area 7 may be performed.

It is sectional drawing of the environmental test apparatus which concerns on one Embodiment of this invention, Comprising: It is a figure when a high temperature tank damper is a non-communication state and a low temperature tank damper is a non-communication state. It is sectional drawing of the environmental test apparatus which concerns on one Embodiment of this invention, Comprising: It is a figure when a high temperature tank damper is a non-communication state and a low temperature tank damper is a communication state. It is sectional drawing of the environmental test apparatus which concerns on one Embodiment of this invention, Comprising: It is a figure when a high temperature tank damper is a communication state and a low temperature tank damper is a non-communication state. It is a perspective view of the regenerator of the environmental test apparatus which concerns on one Embodiment of this invention. It is the graph which showed the relationship between ethanol aqueous solution and freezing temperature (freezing point). It is the graph which showed the temperature change of a high temperature tank, a test area, and a low temperature tank with progress of time according to this embodiment. It is sectional drawing of the environmental test apparatus which concerns on the modification of this invention. It is a fragmentary sectional view of the tube concerning the modification of the regenerator of the present invention. It is the fragmentary top view of the tube which concerns on another modification of the regenerator of this invention, and sectional drawing along the VIIIB-VIIIB line | wire of the said partial top view.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Environmental test apparatus 2 Subarea 3 Main area 5 High temperature tank 6 Low temperature tank 7 Test area 20 Regenerator 52 High temperature tank damper 62 Low temperature tank damper 72 Damper for normal temperature exposure

Claims (5)

A low-temperature tank internally equipped with a cooling mechanism for cooling air and a regenerator;
A test area for placing environmental test specimens;
A damper that can be opened and closed so as to be in a communication state in which the low-temperature bath and the test area are in communication with each other, and a non-communication state in which the low-temperature tank is not in communication;
When the damper is in the communication state, a blower capable of circulating the air in the test area and the low temperature bath,
A control means for controlling the low-temperature tank, the blower, and the damper;
The control means is configured such that when the regenerator is in the communication state, the air in the test area and the low-temperature tank has a low-temperature exposure temperature that is an equilibrium temperature, and the damper is in the non-communication state. In addition, the damper, the low-temperature tank, and the blower are controlled so that the pre-cooling temperature is lower than the low-temperature exposure temperature,
The regenerator includes a tube and a regenerator material enclosed in the tube,
The environmental test apparatus, wherein the cold storage material has a freezing point between the low temperature exposure temperature and the precooling temperature. It further comprises a high-temperature tank equipped with a heater for raising the temperature of the air,
The environmental test apparatus according to claim 1, wherein the low-temperature tank further includes a heater for increasing the temperature of the air.   The environmental test apparatus according to claim 1, wherein the cold storage material is an ethanol aqueous solution, a methanol aqueous solution, or an ethylene glycol aqueous solution.   The environmental test apparatus according to claim 3, wherein the cold storage material has an alcohol concentration of 70 to 85 wt% or an ethylene glycol concentration of 60 to 75 wt% in an aqueous solution.   The environmental test apparatus according to claim 1, wherein the regenerator further includes fins provided around the tube.

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