JP5054599B2 - Condensation suppression device and environmental test device equipped with the same - Google Patents

Description

  The present invention relates to a dew condensation suppression device that suppresses the occurrence of dew condensation in a closed space where the internal pressure can rise and fall, and an environmental test apparatus including the same.

  2. Description of the Related Art Conventionally, a test apparatus that generates a high temperature atmosphere and a low temperature atmosphere and applies a thermal load to the sample is known for the purpose of testing the thermal strength of the sample. In such a test apparatus, when the atmosphere of the test chamber is switched from the high temperature atmosphere to the low temperature atmosphere, the internal pressure of the test chamber is reduced. As a result, outside air is sucked into the test chamber, which may cause condensation in the test apparatus. When dew condensation occurs, there arises a problem that the refrigeration capacity of the refrigerator of the test apparatus is lowered or the test is interrupted due to defrosting.

As a test apparatus provided with a dew condensation suppression device capable of suppressing the occurrence of dew condensation, for example, one disclosed in Patent Document 1 is known. The dew condensation suppression device disclosed in Patent Document 1 has a deformable bag body and a pipe joint that communicates the bag body and the test chamber of the test apparatus. The bag body relaxes the increase in the internal pressure of the test chamber by flowing high temperature air in the test chamber switched from the low temperature atmosphere to the high temperature atmosphere through the pipe joint. Further, the bag body alleviates the decrease in the internal pressure of the test chamber by flowing the air in the bag body through the pipe joint into the test chamber switched from the high temperature atmosphere to the low temperature atmosphere. As described above, the bag body is used as a pressure adjusting unit capable of reducing fluctuations in the internal pressure of the test chamber. With this bag, the internal pressure of the test chamber does not drop significantly even when the high-temperature atmosphere is switched to the low-temperature atmosphere, so that the outside air can be prevented from being sucked into the test chamber. Thereby, generation | occurrence | production of dew condensation is suppressed.
JP 2002-48705 A

  In the dew condensation suppression device, the pipe joint that communicates the bag body and the test chamber cannot dissipate the high-temperature air flowing from the test chamber into the bag body so as to be lower than the heat resistance temperature of the bag body. Flows into the bag while maintaining the temperature. Therefore, the bag body is easily deteriorated by being exposed to high-temperature air. Moreover, when the number of cycles in the high temperature atmosphere and the low temperature atmosphere increases, the deterioration rate of the bag body increases, and in this case, the bag body may be damaged. Although the bag body can be made of a material having sufficient heat resistance, in such a case, the range of material selection becomes narrow.

  Therefore, in view of the above-described problems, the present invention is capable of avoiding damage to the pressure adjusting unit that adjusts the pressure in the closed space and can improve the life of the pressure adjusting unit, and an environment including the same An object is to provide a test apparatus.

  In order to achieve the above object, a dew condensation suppression device according to the present invention is a dew condensation suppression device that suppresses the occurrence of dew condensation in a closed space where the internal pressure can rise and fall. A pressure adjusting unit that relaxes fluctuations in the internal pressure in the closed space by flowing air from the closed space and outflowing air into the closed space as the internal pressure decreases. And a duct communicating the closed space and the pressure adjusting unit. The duct has a shape capable of dissipating heat so that the temperature of the air becomes lower than the heat-resistant temperature when air having a temperature exceeding the heat-resistant temperature of the material constituting the pressure adjusting unit flows from the closed space. is doing.

  In the closed space to which the dew condensation suppression device according to the present invention is attached, fluctuations in the internal pressure of the closed space are alleviated by the pressure adjustment unit of the dew condensation suppression device, so that outside air is difficult to enter, and as a result, condensation occurs. It is a space that can suppress this. Specifically, even if the internal pressure of the closed space decreases, air flows from the pressure adjusting unit into the closed space, so that the decrease of the internal pressure is alleviated and it is difficult for outside air to be sucked into the closed space. As a result, it is possible to suppress the occurrence of condensation in the closed space. Further, even if the internal pressure in the closed space increases, the air in the closed space flows into the pressure adjusting unit, so that the increase in the internal pressure in the closed space is alleviated.

  Moreover, the dew condensation suppression device can maintain the function of reducing internal pressure fluctuations by a duct that connects the closed space and the pressure adjusting unit. Specifically, the duct prevents air having a temperature exceeding the heat-resistant temperature of the material constituting the pressure adjusting unit from flowing into the pressure adjusting unit from the closed space, so that the pressure adjusting unit can be prevented from being damaged. The life of the pressure adjusting unit can be improved. In addition, since the temperature of the air is lowered before flowing into the pressure adjusting unit, the pressure adjusting unit can be made of a material having lower heat resistance than that of the prior art. As a result, the range of selection of the material constituting the pressure adjusting unit is widened, and the cost of the material can be reduced.

  In a preferred embodiment of the present invention, the pressure adjusting unit is a deformable bag, and the bag is inflated by inflowing air from the closed space as the internal pressure increases, and the internal pressure As the air travels down, air flows out into the closed space and contracts.

  According to this configuration, the bag body easily deforms following the pressure fluctuation in the closed space, so that even when the pressure fluctuation in the closed space is small, it is possible to cope.

  In another preferred embodiment of the present invention, the duct is formed in a bellows shape. A plurality of annular fins may be formed on the outer peripheral surface of the duct. With these configurations, the surface area of the duct is increased, so that the heat exchange area between the duct and the outside air can be increased. As a result, heat dissipation of the air flowing into the pressure adjusting unit from the closed space is promoted. Further, when the duct is formed in a bellows shape, the duct can be given flexibility and stretchability. Thereby, the freedom degree of installation of a duct becomes high.

  In still another preferred embodiment of the present invention, the dew condensation suppressing device further includes a blower capable of blowing air to the duct. According to this configuration, the heat dissipation of the air flowing into the duct from the closed space can be further promoted.

  In still another preferred embodiment of the present invention, the duct includes a first duct and a second duct, each one end of the first duct and the second duct is connected to the closed space, and each other The end is connected to the pressure adjusting unit. According to this structure, since the surface area of a duct becomes large compared with the structure using one duct, the heat exchange area of a duct and external air can be enlarged. This facilitates heat dissipation of the air flowing into the duct from the closed space.

  In still another preferred embodiment of the present invention, the pressure adjusting unit includes a first pressure adjusting chamber communicated with the first duct and a second pressure adjusting chamber communicated with the second duct.

  From the viewpoint of promoting the heat dissipation of the air flowing into the pressure adjusting unit from the closed space, a configuration in which the first duct and the second duct are connected to a single pressure adjusting unit may be adopted. However, in this configuration, since the air flows from two ducts into a single pressure adjustment unit, there is a possibility that a circulation flow that flows in the order of the first duct, the pressure adjustment unit, the second duct, and the closed space is generated. There is. When such a circulating flow occurs, the air that exceeds the heat resistance temperature of the material constituting the pressure adjusting unit may flow into the pressure adjusting unit, and in that case, avoiding damage to the pressure adjusting unit is not possible. difficult. Therefore, the circulation flow is prevented from occurring by connecting the first pressure adjusting unit to the first duct and the second pressure adjusting unit to the second duct.

  The closed space is, for example, a test chamber that applies a heat load to a sample placed in the closed space by changing the temperature in the closed space. You may attach the dew condensation suppression apparatus which concerns on this invention to this test chamber. Thereby, it is possible to suppress the occurrence of condensation in the test chamber.

Moreover, the said closed space is the heat insulation panel wall which comprises the test chamber which gives a thermal load to a sample, for example. If the dew condensation suppressing device according to the present invention is attached to this heat insulating panel, it is possible to suppress the occurrence of dew condensation in the heat insulating panel wall.
In the dew condensation suppressing device, wherein the duct includes the first duct and the second duct, a partition wall is disposed inside the pressure adjusting unit, and the first duct is disposed inside the pressure adjusting unit by the partition wall. It may be partitioned into a connected space and a space to which the second duct is connected.

  According to the dew condensation suppression device according to the present invention, it is possible to avoid damage to the pressure adjusting unit and to improve the life of the pressure adjusting unit.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  FIG. 1 is a cross-sectional view schematically showing a configuration of a test apparatus provided with a dew condensation suppression apparatus according to the first embodiment of the present invention. The test apparatus 1 includes a test apparatus main body 2 that tests the sample W, and a dew condensation suppression apparatus 3 that is attached to the test apparatus main body 2 and suppresses the occurrence of condensation in the test apparatus main body 2. The test apparatus 1 is, for example, an environmental test apparatus that applies a thermal load to the sample W to test the thermal strength and the like of the sample W. This environmental test device is a thermal shock test device that applies a thermal load to a sample by alternately exposing the sample to a low temperature and a high temperature, or a thermostatic chamber or a constant temperature and humidity chamber that continuously exposes the sample to an atmosphere of a predetermined condition and applies a thermal load to the sample. It is configured as a tank. Examples of the sample W include a printed board on which a semiconductor chip is mounted. In the present embodiment, the test apparatus 1 will be described as a thermal shock test apparatus.

  The test apparatus main body 2 includes a test chamber 5 in which a sample W to be tested is placed, a high temperature chamber 7 that heats air by a heating means (not shown) and sends hot air to the test chamber 5, and a figure not shown. And a low temperature chamber 9 for cooling the air with a freezer and sending cold air to the test chamber 5. Each of the test chamber 5, the high temperature chamber 7, and the low temperature chamber 9 is a closed space surrounded by a heat insulating panel wall 11 having a heat insulating material (heat insulating layer) inside, and is thermally shielded from each other. The test chamber 5 is provided with a test chamber door 6 for taking in and out the sample W.

  The heat insulation panel wall 11 between the high greenhouse 7 and the test chamber 5 has a hot air supply port 13 for supplying hot air from the high temperature chamber 7 to the test chamber 5, and for returning the hot air from the test chamber 5 to the high temperature chamber 7. A hot air outlet 14 is formed. Hot air flows into the test chamber 5 from the hot air supply port 13, circulates through the test chamber 5, and then returns to the high temperature chamber 7 through the hot air discharge port 14. Thereby, the inside of the test chamber 5 becomes a high temperature atmosphere. At this time, the temperature in the test chamber 5 is set to 150 ° C., for example.

  Further, in the heat insulation panel wall 11 between the low temperature chamber 9 and the test chamber 5, a cold air supply port 15 for supplying cold air from the low temperature chamber 9 to the test chamber 5, and the cold air is returned from the test chamber 5 to the low temperature chamber 9. For this purpose, a cold air outlet 16 is formed. The cold air flows into the test chamber 5 from the cold air supply port 15, circulates in the test chamber 5, and then returns to the low temperature chamber 9 through the cold air discharge port 16. Thereby, the inside of the test chamber 5 becomes a low temperature atmosphere. At this time, the temperature in the test chamber 5 is set to −60 ° C., for example. The hot air supply port 13 and the hot air discharge port 14 are provided with a hot air switching damper 17, and the cold air supply port 15 and the cold air discharge port 16 are provided with a cold air switching damper 19. FIG. 1 shows the hot air switching damper 17 in the open state and the cold air switching damper 19 in the closed state.

  While the test apparatus 1 is in operation, the sample W is alternately exposed to a high temperature atmosphere and a low temperature atmosphere, and is subjected to a thermal load. As a result, the sample W is tested for its thermal strength, thermal stress characteristics, durability, and the like. The number of cycles in the high temperature atmosphere and the low temperature atmosphere is arbitrary depending on the sample W.

  The dew condensation suppression device 3 is disposed outside the test apparatus main body 2 in a state exposed to the outside air, and the pressure adjustment unit 18 that reduces fluctuations in the pressure in the test chamber 5. And a duct 20 to be communicated. The pressure adjusting unit 18 is a deformable bag body in the first embodiment. Examples of the material of the bag 18 include polyethylene, vinyl resin, and silicon. The bag body 18 has a heat resistant temperature of, for example, 80 to 90 ° C. The bag 18 is accommodated in the box 22. An opening is formed in one of the surfaces of the box 22, and a connection pipe 24 made of, for example, stainless steel is fitted into the opening. One end portion 25 of the connection pipe 24 extends into the box body 22, while the other end portion 26 protrudes to the outside. The opening of the bag body 18 is attached to one end 25 of the connecting pipe 24 by a fastening member (not shown) such as a hose band.

  An opening penetrating the heat insulating panel wall 11 is formed on one side surface of the test chamber 5, and a connection pipe 29 made of, for example, stainless steel is fitted into the opening. One end 30 of the connecting pipe 29 is bent and fixed to the inner surface so as to contact the inner surface of the heat insulating panel wall 11, while the other end 31 protrudes from the heat insulating panel wall 11 to the outside. One end of the duct 20 is attached to the other end 31 of the connection pipe 29 on the test chamber 5 side by a fastening member, for example, a hose band, and the other end is connected to the connection pipe 24 on the bag body 18 side. The test chamber 5 and the bag body 18 are communicated with each other by being attached to the other end portion 26 by a fastening member such as a hose band.

  The duct 20 is a bellows-like member made of, for example, aluminum or an aluminum alloy and having a predetermined length. Since the duct 20 is formed in a bellows shape, the surface area of the duct 20 is large. Thereby, the heat exchange area of the duct 20 and outside air can be enlarged. As a result, as will be described later, when the high-temperature air in the test chamber 5 passes through the duct 20, it is possible to dissipate the high-temperature air so that the temperature of the high-temperature air is lower than the heat-resistant temperature of the bag body 18. is there. Further, by forming the duct 20 in a bellows shape, the duct 20 can be given flexibility and stretchability.

  Next, the operation of the dew condensation suppressing device 3 attached to the test apparatus main body 2 will be described. In applying a thermal load to the sample W placed in the test chamber 5 to test the thermal strength and the like of the sample W, first, the atmosphere in the test chamber 5 is changed to a high temperature atmosphere, for example. The high temperature atmosphere is generated by introducing hot air from the high temperature chamber 7 into the test chamber 5 and circulating it by opening the hot air switching damper 17 and closing the cold air switching damper 19. The hot air in the test chamber 5 flows into the bag 18 through the duct 20 through the opening of the test chamber 5 as indicated by an arrow E. The bag body 18 expands as shown by the solid line L1 due to the inflow of high-temperature air. In this way, the bag body 18 relieves an increase in the internal pressure of the test chamber 5.

  After exposing the sample W to the high temperature atmosphere for a predetermined time, the atmosphere in the test chamber 5 is switched from the high temperature atmosphere to the low temperature atmosphere. The low temperature atmosphere is generated by introducing the cold air from the low temperature chamber 9 into the test chamber 5 and circulating it by closing the hot air switching damper 17 and opening the cold air switching damper 19. When the low temperature atmosphere is generated, the internal pressure of the test chamber 5 decreases, so that external air is sucked into the test chamber 5 and tries to enter. However, at this time, the air existing in the bag 18 flows through the duct 20 into the test chamber 5 through the opening as indicated by the arrow S. The bag body 18 shrinks as shown by a two-dot chain line L2. In this way, the bag body 18 relieves a decrease in the internal pressure of the test chamber 5.

  As described above, since the bag body 18 can mitigate fluctuations in the internal pressure of the test chamber 5, particularly a decrease in the internal pressure, outside air is sucked into the test chamber 5 through the gap of the test chamber door 6. hard. As a result, it is possible to suppress dew condensation that can occur when the sucked outside air is cooled. Note that the number of cycles in the high-temperature atmosphere and the low-temperature atmosphere is arbitrarily set depending on the sample W.

  By the way, when the high temperature air in the test chamber 5 maintains its temperature, particularly when the high temperature air flows into the bag body 18 while maintaining a temperature exceeding the heat resistance temperature of the bag body 18, the bag body 18 deteriorates. It becomes easy. Moreover, when the number of cycles in the high temperature atmosphere and the low temperature atmosphere increases, the deterioration rate of the bag body 18 increases, so that the bag body 18 may be damaged.

  However, in the first embodiment, the duct 20 that passes before the high-temperature air flows into the bag body 18 is formed as a bellows-like member having a predetermined length, thereby increasing the heat exchange area between the duct 20 and the outside air. Therefore, the hot air is cooled by heat exchange with the outside air when passing through the duct 20, and the temperature thereof is lower than the heat-resistant temperature of the bag body 18. Thereby, it is possible to prevent high-temperature air having a temperature exceeding the heat resistance temperature of the bag body 18 from flowing into the bag body 18. As a result, since the deterioration and breakage of the bag 18 can be avoided, the life of the bag 18 can be improved. By improving the life of the bag 18, it is possible to cope with an increase in the number of cycles in a high temperature atmosphere and a low temperature atmosphere. Therefore, it is possible to improve the continuous operability of the environmental test apparatus 1.

  Further, since the temperature of the high-temperature air is lowered before flowing into the bag body 18, the bag body 18 can be made of a material having lower heat resistance than that of the prior art. Thereby, the range of selection of the material constituting the bag body 18 is widened, and the cost of the material can be reduced.

  In the embodiment shown in FIG. 1, the duct 20 is formed in a bellows shape. Instead, a plurality of annular fins (not shown) may be provided on the outer peripheral surface of the duct 20. Even with this configuration, the surface area of the duct 20 is increased. Thereby, since the heat exchange area between the duct 20 and the outside air can be increased, it is possible to dissipate the high-temperature air so that the temperature of the high-temperature air is lower than the heat resistance temperature of the bag body 18.

  As a means for promoting the heat radiation of the high-temperature air, as shown in FIG. 1, an air blower 35 may be disposed in the vicinity of the duct 20 to blow the outside air A to the duct 20. In addition, a cooler (not shown) that takes in outside air and cools outside air may be mounted on the blower 35, and cooling air may be blown into the duct 20. If the blower 35 or the blower 35 mounted with a cooler is combined with a configuration in which the duct 20 is formed in a bellows shape or a configuration in which fins are provided on the outer surface of the duct 20, it is possible to improve the heat dissipation efficiency of high-temperature air. is there.

  Furthermore, since the duct 20 has flexibility and stretchability, the degree of freedom of installation of the duct 20 is high. Thereby, the dew condensation suppressing device 3 according to the present embodiment can be installed avoiding the existing peripheral devices of the test apparatus main body 2 when being attached to the test apparatus main body 2, particularly the existing test apparatus main body 2. As shown in FIG. 2, the dew condensation suppression device 3 places the box body 22 containing the bag body 18 on, for example, the top portion (the upper portion of the high temperature chamber 7) 11 a of the test apparatus body 2, and the duct 20 You may attach to the test apparatus main body 2 by arrange | positioning so that it may extend over the top part 11a along the heat insulation panel wall 11 from the one side of the test chamber 5. FIG.

  In this case, since the duct 20 is arranged so as to extend linearly in the vertical direction along the heat insulating panel wall 11, the high temperature air passing through the duct 20 becomes an upward flow due to the chimney effect. Heat dissipation is promoted. A duct cover 21 that covers the duct 20 may be employed. When the duct 20 is heated by high-temperature air passing through the duct 20, there is a risk of burns if an operator touches the duct 20, but such a danger can be eliminated by the duct cover 21. . The duct cover 21 is attached to the heat insulation panel wall 11, for example. The duct cover 21 is preferably a punched plate that has been punched. Thereby, the air permeability of the duct cover 21 can be ensured. Furthermore, although illustration is omitted, if the blower 35 is attached to the duct cover 21, the heat radiation of the high-temperature air passing through the duct 20 can be further promoted.

  FIG. 3 is a cross-sectional view schematically showing a configuration of a test apparatus provided with the dew condensation suppression apparatus according to the second embodiment of the present invention. The second embodiment is different from the first embodiment of FIG. 1 in that the dew condensation suppression device 3 and the test device main body 2 are communicated with each other by two ducts 20. Specifically, the dew condensation suppression device 3 of the second embodiment includes a first duct 40 and a second duct 41 that are independent of each other, and a first bag body 43 (first pressure adjustment chamber) that communicates with the first duct 40. And a second bag body 44 (second pressure adjustment chamber) communicated with the second duct 41. The first bag body 43 and the second bag body 44 are accommodated in separate box bodies 46 and 47. Since each of the 1st bag body 43 and the 2nd bag body 44 has the structure same as the bag body 18 shown in FIG. 1, description is abbreviate | omitted.

  A first opening 50 and a second opening 51 penetrating the heat insulating panel wall 11 are formed on one side surface of the test chamber 5, and a first connection pipe 52 is connected to the second opening 51 in the first opening 50. The second connecting pipe 53 is fitted. The first duct 40 is attached to the first connection pipe 52 and communicates with the test chamber 5, and the second duct 41 is attached to the second connection pipe 53 and communicates with the test chamber 5. The 1st duct 40 and the 2nd duct 41 are arrange | positioned outside the test apparatus main body 2 in the state exposed to external air similarly to 1st Embodiment of FIG.

  In the second embodiment, when the atmosphere in the test chamber 5 is a high temperature atmosphere, the high temperature air in the test chamber 5 has two ducts, a first duct 40 and a second duct 41, as indicated by an arrow E in FIG. It passes through the first bag body 43 and the second bag body 44. According to this configuration, since the heat exchange area between the duct and the outside air can be increased as compared with the configuration employing one duct, the temperature of the high-temperature air is set to the first bag body 43 and the second bag. The temperature can be lowered more easily than the heat resistance temperature of the body 44.

  Moreover, in 2nd Embodiment, since the bag body is comprised by two, the 1st bag body 43 and the 2nd bag body 44, compared with 1st Embodiment, each bag body 43 and 44 is small-sized. Can be Thereby, the dew condensation suppressing device 3 of the second embodiment can be arranged avoiding the existing peripheral devices of the test device main body 2 when being attached to the test device main body 2, particularly the existing test device main body 2. is there. Thus, the dew condensation suppression device 3 of the second embodiment has a high degree of freedom in installation.

  In the second embodiment, as described above, the two ducts of the first duct 40 and the second duct 41 are used, and the first bag body 43 and the second duct 41 corresponding to the first duct 40 and the second duct 41 are used. Although the structure which connects to the bag body 44 is employ | adopted, instead, as shown in 3rd Embodiment of FIG. 4, in the single bag body 18, two of the 1st duct 40 and the 2nd duct 41 are used. You may employ | adopt the structure which connects a duct. Since this structure also uses the two ducts 40 and 41, the heat exchange area with the outside air can be increased. As a result, the temperature of the high-temperature air can be lowered more easily than the heat resistance temperature of the bag body 18. And since only the single bag 18 is employ | adopted as a bag, the structure of the dew condensation suppression apparatus 3 can be simplified compared with the structure of 2nd Embodiment of FIG.

  In the third embodiment, since the high temperature air flows into the single bag 18 from the two ducts of the first and second ducts 40 and 41, for example, the first duct 40, the bag 18, the second There is a possibility that a circulating flow in the order of the duct 41 and the test chamber 5 is generated. When such a circulating flow is generated, high-temperature air exceeding the heat resistance temperature of the material constituting the bag body 18 may flow into the bag body 18, and in that case, avoiding the bag body 18 from being damaged. Is difficult. In order to avoid breakage of the bag body 18, a partition wall 55 indicated by a two-dot chain line is arranged in the bag body 18, and the air flowing in from the first duct 40 and the air flowing in from the second duct 41 are It is only necessary to avoid contact. Thereby, generation | occurrence | production of the said circulating flow can be prevented.

  As mentioned above, although the dew condensation suppression apparatus 3 which concerns on 1st-3rd embodiment of this invention has been demonstrated about the case where it uses in order to suppress that dew condensation generate | occur | produces in the environmental test apparatus 1, the dew condensation suppression apparatus 3 is described. It may be used to suppress the occurrence of condensation in the heat insulation panel wall 11 of the environmental test apparatus 1. An example of this is shown in FIG.

  The dew condensation suppression device shown in FIG. 5 is attached to the heat insulation panel wall 11 of the test chamber 5 and suppresses the occurrence of dew condensation in the heat insulation panel wall 11. Specifically, the heat insulation panel wall 11 of the test chamber 5 has an outer wall 11a and an inner wall 11b formed of sheet metal, and a heat insulating material is disposed in a closed space C surrounded by the outer wall 11a and the inner wall 11b. The heat insulating layer 60 is formed. The heat insulating material is, for example, glass wool or rock wool of a cotton-like laminate. An opening is formed in the outer wall 11a, and a connecting pipe 62 is fitted into this opening. One end of the duct 20 of the dew condensation suppression device 3 is attached to the connection pipe 62 using a fastening member, for example, a hose band. Thereby, the bag body 18 of the dew condensation suppression apparatus 3 and the heat insulation layer 60 of the heat insulation panel wall 11 are connected. Since the configuration of the dew condensation suppression device 3 is the same as that shown in the first embodiment, the description thereof is omitted.

  When a high temperature atmosphere is generated in the test chamber 5 in order to give a thermal load to the sample W placed in the test chamber 5, the inner wall 11b of the heat insulating panel wall 11 is heated by the high temperature air. When the inner wall 11b is heated, the air in the heat insulating layer 60 is heated and expands. The expanded high-temperature air flows into the bag body 18 through the duct 20 of the dew condensation suppression device 3 as shown by the arrow E, and the bag body 18 expands. Thereby, it is relieved that the internal pressure of the heat insulation panel wall 11 rises.

  Further, when the inside of the test chamber 5 is shifted from the high temperature atmosphere to the low temperature atmosphere, the inner wall 11b of the heat insulating panel wall 11 is cooled by the low temperature air. When the inner wall 11b is cooled, the air in the heat insulating layer 60 is cooled and contracts. For this reason, since the internal pressure of the heat insulation panel wall 11 falls, external air will be sucked into the heat insulation layer 60 from the clearance of the sheet metal connection part of the outer wall 11a, etc., and will enter. However, at this time, the air existing in the bag body 18 flows into the heat insulating layer 60 through the duct 20 as indicated by an arrow S. Thereby, it reduces the internal pressure of the heat insulation panel wall 11 falling.

  As described above, since the bag body 18 can mitigate fluctuations in the internal pressure of the heat insulating panel wall 11, particularly a decrease in the internal pressure, it is difficult for outside air to be sucked into the heat insulating panel wall 11. As a result, it is possible to suppress dew condensation that may occur when the invading outside air is cooled. In particular, when a heat insulating material of a cotton-like laminate or a heat insulating material having open cells is used, such a heat insulating material easily allows gas and liquid to pass through. Therefore, the configuration of FIG. It is advantageous. In addition, the duct 20 may be formed in a bellows shape as in the first embodiment, or a plurality of annular fins may be formed on the outer peripheral surface. Further, a blower 35 may be disposed in the vicinity of the duct 20.

  As described above, the case where the dew condensation suppressing device 3 of the present invention is applied to the environmental test apparatus 1 has been described. However, the dew condensation suppressing device 3 includes a closed space in which dew condensation may occur due to inflow of outside air. Needless to say, the present invention can be applied to other test apparatuses.

It is sectional drawing which shows schematically the structure of the test apparatus provided with the dew condensation suppression apparatus which concerns on 1st Embodiment of this invention. It is sectional drawing which shows roughly the structure which has arrange | positioned the dew condensation suppression apparatus in the top part of the test apparatus main body. It is sectional drawing which shows roughly the structure of the dew condensation prevention apparatus which concerns on 2nd Embodiment of this invention. It is sectional drawing which shows schematically the structure of the dew condensation prevention apparatus which concerns on 3rd Embodiment of this invention. It is sectional drawing which shows roughly the structure which attached the dew condensation suppression apparatus of this invention to the heat insulation panel wall of the test apparatus main body of an environmental test apparatus.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Environmental test apparatus 2 Test apparatus main body 3 Condensation suppression apparatus 5 Test room 7 High greenhouse 9 Low greenhouse 11 Thermal insulation panel wall 18 Bag body 20 Duct 35 Blower W Sample

Claims (10)

A dew condensation suppression device that suppresses the occurrence of dew condensation in a closed space where the internal pressure can rise and fall,
Fluctuation of the internal pressure of the closed space by flowing air from the closed space as the internal pressure increases and by flowing air into the closed space as the internal pressure decreases. A pressure adjusting part for relaxing
A duct communicating the closed space and the pressure adjusting unit;
With
The duct has a shape capable of dissipating heat so that the temperature of the air becomes lower than the heat-resistant temperature when air having a temperature exceeding the heat-resistant temperature of the material constituting the pressure adjusting unit flows from the closed space. Condensation suppression device. The dew condensation suppressing device according to claim 1, wherein the pressure adjusting unit is a deformable bag,
The bag body is a dew condensation suppression device that expands when air flows in from the closed space as the internal pressure increases, and shrinks by flowing air into the closed space as the internal pressure decreases.   The dew condensation suppressing device according to claim 1 or 2, wherein the duct is formed in an accordion shape.   The dew condensation suppressing device according to claim 1 or 2, wherein a plurality of annular fins are formed on the outer peripheral surface of the duct.   The dew condensation suppressing device according to any one of claims 1 to 4, further comprising a blower capable of blowing air to the duct. The dew condensation suppressing device according to claim 1, wherein the duct includes a first duct and a second duct,
One end of each of the first duct and the second duct is connected to the closed space, and each other end is connected to the pressure adjusting unit.   The dew condensation suppressing device according to claim 6, wherein the pressure adjusting unit includes a first pressure adjusting chamber communicated with the first duct and a second pressure adjusting chamber communicated with the second duct. A test chamber that has a closed space surrounded by a predetermined wall, and applies a heat load to the sample placed in the closed space by changing the temperature in the closed space;
The dew condensation suppressing device according to any one of claims 1 to 7, which is attached to the test chamber and suppresses the occurrence of dew condensation in the test chamber.
Environmental test equipment with An insulating panel wall having a closed space inside,
A test chamber which is surrounded by the heat insulating panel wall and applies a thermal load to the sample by changing the ambient temperature;
The dew condensation suppressing device according to claim 1, wherein the dew condensation suppressing device is attached to the heat insulating panel wall to suppress dew condensation from occurring in the closed space.
Environmental test equipment with   7. The dew condensation suppression device according to claim 6, wherein a partition wall is disposed inside the pressure adjusting unit, and the partition wall connects the space where the first duct is connected to the second duct in the pressure adjusting unit. Condensation control device that is partitioned into open space.

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