JP4997168B2 - 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 due to the intrusion of outside air into 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, since the outside air is sucked into the test chamber, condensation can occur 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 airbag attached to a test chamber. The airbag relaxes an increase in the internal pressure of the test chamber by inflating by injecting high temperature air in the test chamber switched from the low temperature atmosphere to the high temperature atmosphere. Further, the airbag relaxes the decrease in the internal pressure of the test chamber by causing the air in the airbag to flow out into the test chamber switched from the high temperature atmosphere to the low temperature atmosphere and contract. As described above, the airbag is used as a pressure adjusting unit capable of relieving fluctuations in the internal pressure of the test chamber. By this air bag, the internal pressure of the test chamber does not decrease greatly 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

  However, in the dew condensation suppression device, the air bag may not shrink to such an extent that the internal pressure can be reduced due to the fact that the air in the air bag does not flow into the test chamber quickly. In this case, since outside air is sucked into the test chamber, it is not possible to suppress the occurrence of condensation in the test apparatus.

  Then, in view of the said subject, this invention aims at providing the dew condensation suppression apparatus which can improve the suppression function of dew condensation generation | occurrence | production, and an environmental test apparatus provided with the same.

In order to solve the above problems, a dew condensation suppression device according to the present invention is a dew condensation suppression device that suppresses the occurrence of dew condensation due to the entry of outside air into a closed space where the internal pressure can rise and fall. With the increase in the internal pressure, the air expands due to the air flowing in from the closed space, while the internal pressure decreases, the air flows out into the closed space and contracts, thereby reducing the internal space of the closed space. A pressure adjusting unit having an airbag that relieves fluctuations in pressure, and a deformation forcing unit capable of forcibly contracting the airbag , wherein the pressure adjusting unit is provided on the airbag by the deformation forcing unit. An air flow securing means capable of restricting the contraction and securing the air flow from the inside of the airbag to the closed space, and the air flow securing means includes the closed space from the airbag. Air flow to Is formed with a plurality of openings for causing the air bag is provided so as to cover the portion where the plurality of openings are formed out of the air circulation ensuring means.

  According to the dew condensation suppression device according to the present invention, since the fluctuation of the internal pressure of the closed space is alleviated by the airbag, it is difficult for outside air to enter the closed space, and as a result, the occurrence of dew condensation can be suppressed. is there. Specifically, even if the internal pressure in the closed space decreases, air flows from the airbag into the closed space, so that the decrease in 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. Even if the internal pressure in the closed space increases, the air in the closed space flows into the airbag, so that the increase in the internal pressure in the closed space is mitigated.

Furthermore, in the dew condensation suppression device of the present invention, the deformation forcing part forcibly shrinks the airbag, so that the air in the airbag can be actively introduced into the closed space. As a result, even when the internal pressure of the closed space is rapidly reduced, the outside air is less likely to be sucked into the closed space. Thus, the dew condensation suppressing device of the present invention has a high dew condensation suppressing function. Further, when the airbag is unilaterally contracted by the deformation forcing portion, the airbag may obstruct air flow from the inside of the airbag to the closed space depending on how it is contracted. By the distribution ensuring means, it is possible to regulate how the airbag is contracted by the deformation forcing part, so that the airbag can be prevented from obstructing the circulation of the air from the inside of the airbag to the closed space. Air flow from inside to closed space can be secured. Further, in this configuration, since the air flow ensuring means has a plurality of openings, it is possible to smoothly flow the air between the closed space and the airbag.

In another preferred embodiment of the present invention, the air flow securing means, the closed space and has a disposed a plate member between said airbag, said plurality of openings, the shape formed in the plate member Has been. The plurality of openings are preferably formed over the entire surface of the plate member.

  In this configuration, the plate member regulates how the airbag is contracted by the deformation forcing portion. In addition, since a plurality of openings are formed in the plate member, it is possible to smoothly distribute air from the airbag to the closed space.

In still another preferred embodiment of the present invention, the air flow securing means is a cylindrical member disposed so as to extend into the airbag, and the plurality of openings are peripheral walls of the cylindrical member . Is formed .

  In this configuration, the tubular member regulates how the airbag is contracted by the deformation forcing portion. In addition, since a plurality of openings are formed in the peripheral wall of the cylindrical member, it is possible to smoothly distribute air between the closed space and the airbag.

  In still another preferred embodiment of the present invention, the pressure adjusting unit further includes a box body that accommodates the airbag, and the deformation forcing portion is communicated with the box body, and the box body and the The air bag is forcibly contracted by supplying air into a space formed between the air bag and the air bag.

  In this configuration, the air bag can be forcibly contracted by using air pressure only by supplying air to the space between the car body and the air bag by using the air bag housing the air bag. Therefore, the configuration of the dew condensation suppression device can be simplified.

  In still another preferred embodiment of the present invention, the deformation forcing portion forcibly inflates the airbag by sucking air in the space formed between the box and the airbag. It has a function.

  According to this configuration, the deformation forcing part forcibly inflates the airbag, so that air can be positively stored in the airbag. Thereby, air can be stored in the airbag in advance before the internal pressure of the closed space decreases.

  In still another preferred embodiment of the present invention, the deformation forcing portion includes a movable member that presses the airbag and forcibly contracts the airbag, and a drive portion that drives the movable member. In this configuration, the airbag is forcibly contracted by pressing the airbag with the movable member.

  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.

  According to the dew condensation suppressing device according to the present invention, it is possible to improve the dew condensation suppressing function.

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

(Embodiment 1)
FIG. 1 is a cross-sectional view schematically showing a configuration of a dew condensation suppression device according to a first embodiment of the present invention and a test device including the same. 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. The environmental test apparatus 1 is a thermal shock test apparatus that alternately exposes a sample to a low temperature and a high temperature to apply a heat load to the sample, or a thermostatic chamber or a thermostatic chamber that continuously exposes the sample to an atmosphere of a predetermined condition and applies the heat load to the sample. It is configured as a wet 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. Further, a pressure sensor 58 for measuring the internal pressure of the test chamber 5 is disposed in the test chamber 5. The test apparatus main body 2 further includes a control unit 56 that controls the deformation forcing unit 50 described later based on the measurement value obtained by the pressure sensor 58.

  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.

  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. 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. Thereby, for example, the heat intensity, the heat stress characteristic, and the durability of the sample W are tested. 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 includes an airbag 18 that suppresses fluctuations in pressure in the test chamber 5, a box 22 that houses the airbag 18, and a net-like plate member 26 that is disposed in the box 22. And a deformation forcing unit 50 that can be deformed so that the airbag 18 is forcibly contracted and inflated in response to an instruction from the control unit 56. The airbag 18 is a deformable member, and expands when high-temperature air flows from the test chamber 5, and contracts when the air in the airbag 18 flows into the test chamber 5. In FIG. 1, a state where the airbag 18 is inflated in the housing cover 23 is indicated by a solid line L1, and a state where the airbag 18 is contracted is indicated by a one-dot chain line L2. Examples of a general material for the airbag 18 include polyethylene, vinyl resin, silicon, polyimide, and PTFE.

  The box 22 includes a storage cover 23 that stores the airbag 18 and a bottom member 24 to which the storage cover 23 is assembled. A reticulated plate member 26 is disposed between the bottom member 24 and the housing cover 23. Connecting flanges 24 a and 23 a projecting outward are formed at the opening edge of each opening of the bottom member 24 and the housing cover 23. The airbag 18 is arranged in such a manner that its edge is overlapped between the connecting flanges 23a and 24a, and then the connecting flanges 23a and 24a are connected to each other with connecting members such as bolts and nuts (not shown). 22 is supported. Thus, the airbag 18 supported by the box 22 also functions as a seal member that hermetically seals between the connecting flanges 23a and 24a. The box 22 has a rectangular cross section when the housing cover 23 is assembled to the bottom member 24, but the shape of the box 22 is not limited thereto.

  The box body 22 and the test chamber 5 are communicated with each other by a connecting pipe 28 which is a cylindrical member made of, for example, stainless steel. Specifically, a through hole 30 penetrating the heat insulating panel wall 11 is formed on one side surface of the test chamber 5, and a through hole 31 is formed at a substantially central portion of the bottom member 24. Has been. One end 32 of the connection pipe 28 is fitted in the through hole 30 of the test chamber 5 in an airtight manner, while the other end 33 of the connection pipe 28 is fitted in the through hole 31 in the bottom member 24 in an airtight manner. In this way, the box body 22 and the test chamber 5 communicate with each other through the connection pipe 28, so that high-temperature air in the test chamber 5 can flow into the airbag 18 through the connection pipe 28 as will be described later. In addition, the air in the airbag 18 can flow into the test chamber 5 through the connection pipe 28. The box body 22 and the test chamber 5 are communicated with each other through the connection pipe 28. However, the box body 22 and the test chamber 5 may be directly connected to each other without using the connection pipe 28.

  The mesh plate member 26 disposed between the bottom member 24 and the housing cover 23 is a member in which a large number of meshes are uniformly formed over the entire surface, and the air in the airbag 18 is circulated through the meshes. . As shown by the alternate long and short dash line L <b> 2, the airbag 18 is prevented from contracting by the mesh plate member 26, and the manner of contraction is restricted. In particular, even when the airbag 18 is forcibly contracted by a deformation forcing unit 50 described later, the manner of contraction is regulated by the mesh plate member 26. Accordingly, the airbag 18 can be prevented from being unilaterally contracted by the deformation forcing portion 50 and sucked into the through hole 31 of the bottom member 24, so that air circulation from the airbag 18 to the test chamber 5 is ensured. be able to. As described above, the mesh plate member 26 constitutes an air flow securing means that regulates the manner in which the airbag 18 contracts and ensures the flow of air from the airbag 18 to the test chamber 5. Note that the number of meshes of the mesh plate member 26 and the size of each mesh are set within a range in which the communication between the test chamber 5 and the airbag 18 can be kept good.

  The deformation forcing unit 50 of the dew condensation suppression device 3 is supplied via the introduction pipe 53 by the air supply unit 52 that supplies air to the space G formed between the airbag 18 and the housing cover 23, and the air supply unit 52. And an air pressure adjusting unit 51 that adjusts the pressure of the air. The air pressure adjusting unit 51 is communicated with the inside of the housing cover 23, that is, the space G by the lead-out pipe 54. The space G is a space in which communication with the test chamber 5 is blocked by the airbag 18, and the air supplied to the space G and the air in the test chamber 5 are not mixed with each other via the connection pipe 28. Absent. The air supply unit 52 includes, for example, an air compressor (not shown) that supplies air and a drive unit (not shown) that receives an instruction from the control unit 56 and drives the air compressor.

  FIG. 2 is an explanatory diagram illustrating an example of the configuration of the air pressure adjusting unit 51. The air pressure adjusting unit 51 includes, for example, a first filter 62, an air pressure adjusting valve 63, an air pressure gauge 64, a second filter 65, and an opening / closing valve 66 from the upstream side. The first filter 62 removes oil contained in the air supplied from the air supply unit 52 via the introduction pipe 53. The air pressure adjustment valve 63 is, for example, a butterfly valve, and adjusts the pressure (that is, the flow rate) of air. The air pressure gauge 64 measures the air pressure adjusted by the air pressure adjusting valve 63. The second filter 65 removes dust in the air. When the opening / closing valve 65 receives an opening operation instruction from the control unit 56, the opening / closing valve 65 guides air to the outlet pipe 54, and when receiving the closing operation instruction, blocks the air flow.

  When the control unit 56 determines that the internal pressure of the test chamber 5 is a negative pressure lower than the pressure around the test apparatus 1 (external pressure) based on the measurement value obtained by the pressure sensor 58 of the test chamber 5. The drive unit of the air supply unit 52 of the deformation forcing unit 50 is operated, and air is led out from the air compressor toward the air pressure adjustment unit 51. The air supplied from the air supply unit 52 is adjusted in pressure by the air pressure adjustment unit 51, and then passes through the opening / closing valve 66 opened in response to an instruction from the control unit 56. As shown in FIG. 1), it is led into the space G through the lead-out pipe 54. As shown by the arrow F, the air derived into the space G pressurizes the airbag 18 from the outside to forcibly contract it. As the airbag 18 is forcibly contracted, the air in the airbag 18 passes through the mesh of the mesh plate member 26 and flows into the test chamber 5 through the connection pipe 28. In this manner, the deformation forcing unit 50 is for forcibly contracting the airbag 18 and causing the air in the airbag 18 to actively flow into the test chamber 5. When the airbag 18 contracts, the control unit 56 issues an instruction to stop the drive of the air compressor to the drive unit of the air supply unit 52, and closes the open / close valve 66 of the pneumatic pressure adjustment unit 51 to the closed state. Give instructions to become.

  The housing cover 23 is provided with an exhaust unit 80 that discharges the air introduced into the space G by the deformation forcing unit 50 to the outside. As shown in FIG. 3, the exhaust unit 80 is slidably overlapped with the first slit plate 82 fixed so as to cover the through hole 74 formed in the housing cover 23 from the outside, and the first slit plate 82. The second slit plate 83 and a drive unit 84 that reciprocates the second slit plate 83 are included. The drive part 84 is comprised with the air cylinder in FIG. In each of the first slit plate 82 and the second slit plate 83, a plurality of slits 86 and 88 are formed at predetermined intervals. When the slit 86 of the first slit plate 82 is opened by the sliding of the second slit plate 83, the air introduced into the space G by the deformation forcing part 50 is released to the outside through the slits 86 and 88. .

  The exhaust unit 80 closes the slit 86 of the first slit plate 82 when air is introduced into the space G by the deformation forcing unit 50 and the airbag 18 is forcibly contracted. For this reason, the internal pressure of the space G rises. Next, when the test chamber 5 is switched from the low temperature atmosphere to the high temperature atmosphere, the high temperature air H starts to flow from the test chamber 5 into the shrinking airbag 18. At this time, the control unit 56 causes the driving unit 84 to slide the second slit plate 83 to open the slit 86 of the first slit plate 82. Thereby, the air introduced into the space G by the deformation forcing part 50 is discharged to the outside through the slits 86 and 88 as indicated by an arrow T. The exhaust pressure lowers the internal pressure of the space G and returns to the same pressure as the external air pressure, so that the airbag 18 can be inflated as the hot air H flows in. As a result, the increase in the internal pressure of the test chamber 5 can be alleviated without hindrance. The air introduced into the space G can be discharged in advance before the test chamber 5 is switched from the low temperature atmosphere to the high temperature atmosphere. Further, instead of the first slit plate 82 and the second slit plate 83, an open / close damper may be used. In this case, the air in the space G can be discharged to the outside by opening the open / close damper with the drive unit 84.

  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. At this time, the air in the test chamber 5 becomes high temperature and expands, and the internal pressure of the test chamber 5 increases, so that it passes through the connecting pipe 28 and then the mesh of the mesh plate member 26 as indicated by an arrow E. It flows into the airbag 18. The airbag 18 inflates as shown by the solid line L1 due to the inflow of high-temperature air. In this way, the airbag 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 air in the test chamber 5 contracts and the internal pressure of the test chamber 5 decreases, so that outside air is sucked into the test chamber 5 and tries to enter. However, at this time, as shown by the arrow S, the air existing in the airbag 18 flows into the test chamber 5 through the mesh of the mesh plate member 26 and then through the connection pipe 28, and the airbag 18 is 2 Shrink as shown by the dotted line L2. In this way, the airbag 18 relieves a decrease in the internal pressure of the test chamber 5.

  As described above, the air bag 18 can mitigate fluctuations in the internal pressure of the test chamber 5, particularly a decrease in the internal pressure, so that 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, in the conventional dew condensation suppression device, when the test chamber is switched from a high temperature atmosphere to a low temperature atmosphere, the air bag reduces the internal pressure drop due to the fact that the air in the air bag does not flow into the test chamber quickly. In such a case, the outside air is sucked into the test chamber, so that it is not possible to suppress the occurrence of condensation in the environmental test apparatus. However, in the dew condensation suppression device 3 of this embodiment, when the control unit 56 determines that the internal pressure of the test chamber 5 is a negative pressure lower than the atmospheric pressure based on the measurement value obtained by the pressure sensor 58, the forced deformation is performed. Since the airbag 18 is forcibly contracted by controlling the portion 50, the air in the airbag 18 can be actively flowed into the test chamber 5. As a result, it is possible to suppress the outside air from being sucked into the test chamber 5 even when the internal pressure of the test chamber 5 is rapidly reduced. Thus, the dew condensation suppression device of this embodiment has a high dew condensation suppression function.

  As mentioned above, although the dew condensation suppression apparatus 3 which concerns on 1st Embodiment of this invention has been demonstrated about the case where it uses in order to suppress dew condensation generating in the environmental test apparatus 1, a dew condensation suppression apparatus 3 is an environmental test. You may use in order to suppress that dew condensation generate | occur | produces in the heat insulation panel wall 11 of the apparatus 1. FIG. This example is shown in FIG. 4 as a second embodiment of the present invention.

(Second Embodiment)
The dew condensation suppressing device 3 shown in FIG. 4 is attached to the heat insulating panel wall 11 of the test chamber 5 and suppresses the occurrence of dew condensation in the heat insulating 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. Thus, the heat insulating layer 60 is formed. The heat insulating material is, for example, glass wool or rock wool. A through-hole is formed in the outer wall 11a, and one end of the connection pipe 48 is fitted in the through-hole in an airtight manner. The other end of the connection pipe 48 is fitted in the through hole 31 of the bottom member 24 of the box 22 in an airtight manner. Thereby, the airbag 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 hot air flows into the airbag 18 through the connecting pipe 48 as indicated by an arrow E, and the airbag 18 is inflated. Thereby, it is relieved that the internal pressure of the heat insulation panel wall 11 rises.

  When the inside of the test chamber 5 is switched 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 airbag 18 flows into the heat insulating layer 60 through the connecting pipe 48 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 air bag 18 can mitigate fluctuations in the internal pressure of the heat insulation panel wall 11, particularly a decrease in internal pressure, it is difficult for outside air to be drawn into the heat insulation panel wall 11. As a result, it is possible to suppress dew condensation that may occur when the invading outside air is cooled.

  As described above, the first embodiment and the second embodiment of the present invention have been described with reference to FIGS. 1 to 4. The components of the first embodiment and the second embodiment are as follows. Various modifications are possible.

  For example, in the first and second embodiments, the deformation forcing unit 50 presses the airbag 18 with air pressure, but the airbag 18 may be mechanically pressed with a movable member. Specifically, as shown in FIG. 5, the deformation forcing part 50 is arranged in a space G between the housing cover 23 of the box 22 and the airbag 18 and is movable so as to press the airbag 18. A drive unit 72 that reciprocates the movable member 70 in the housing cover 23 as indicated by an arrow R, and a connection that connects the movable member 70 and the drive unit 72 to transmit the driving force of the drive unit 72 to the movable member 70. Rod 71. The movable member 70 is a flat plate member in this modification. The drive unit 72 connected to the connecting rod 71 may be constituted by, for example, a motor, or may be configured to drive the movable member 70 with fluid pressure such as air pressure or hydraulic pressure.

  In this modified example, when the control unit 56 determines that the internal pressure of the test chamber 5 is a negative pressure based on the measurement value obtained by the pressure sensor 58, the control unit 56 operates the drive unit 72. The movable member 70 is driven by the driving unit 72 so as to press the airbag 18. Accordingly, the airbag 18 is forcibly contracted by the movable member 70 as indicated by an arrow F, and the air in the airbag 18 flows into the test chamber 5. The movable member 70 is not fixed to the airbag 18, and after the airbag 18 is forcibly contracted, the movable member 70 is driven so as to be separated from the airbag 18 by the driving unit 72. Returns to its original position before the inflow. Thereby, the movable member 70 does not hinder the inflation operation of the airbag 18. The movable member 70 may be fixed to the airbag 18.

  Moreover, the deformation | transformation forcing part 50 may be comprised with the suction pressurization pump which can attract | suck and discharge air. If such a pump is used, not only can the airbag 18 be forcibly contracted, but the airbag 18 can be forcibly inflated by sucking the air in the space G. The air can be collected positively. Thereby, air can be stored in the airbag 18 in advance before the internal pressure of the test chamber 5 decreases.

  Further, the deformation forcing unit 50 is replaced with a configuration having the air pressure adjusting unit 51 and the air supply unit 52, and a pipe that can be connected to a high-pressure air source provided as factory equipment, and the pipe is provided in the pipe. You may comprise with the pressure adjustment mechanism which adjusts the pressure of the air from a high pressure air source.

  Furthermore, the air pressure adjusting unit 51 of the deformation forcing unit 50 may be configured by a slide damper capable of adjusting the opening area. In this case, the pressure of air from the air supply unit 52 is adjusted by adjusting the opening area.

  Further, in FIG. 1, the air flow securing means is constituted by the mesh plate member 26, but as shown in FIG. 6A, the connection pipe (tubular member) 28 extended into the box body 22. The other end portion 33 may constitute air flow ensuring means. Specifically, the connecting pipe 28 is arranged so that the other end 33 extends in the box 22 by a predetermined distance. As shown in FIG. 6B, the other end 33 has a peripheral wall 33a in which a plurality of wall holes 35 are formed uniformly. The end surface 33b of the other end 33 is closed in FIG. 6B, but a wall hole may be formed similarly to the peripheral wall 33a. The airbag 18 is airtightly attached to the peripheral wall 33a of the other end portion 33 by a fastening member (not shown), for example, a hose band, at a position where all the wall holes 35 can be opened in the airbag 18. . A solid line L1 indicates a state where the airbag 18 is inflated, and an alternate long and short dash line L2 indicates a state where the airbag 18 is contracted.

  Also in this modified example, it is possible to ensure the air flow from the airbag 18 to the test chamber 5. Specifically, even if the airbag 18 is forcibly contracted by the deformation forcing unit 50, the way in which the airbag 18 is contracted is regulated by the other end portion 33. Accordingly, the airbag 18 can be prevented from being unilaterally contracted by the deformation forcing portion 50 and sucked into the through hole 31 of the box body 22, so that air circulation from the airbag 18 to the test chamber 5 is ensured. be able to. Moreover, since the wall hole 35 of the other end part 33 is formed uniformly in the peripheral wall 33a, the airbag 18 is shrunk so as to uniformly wrap the other end part 33 without deviation. Thereby, the air in the airbag 18 can be made to flow into the test chamber 5 without deviation.

  In addition, in the modification shown in FIG. 6B, the case where a large number of wall holes 35 are formed in the peripheral wall 33a of the other end portion 33 has been described. However, the present invention is not limited to this. As shown in FIG. 6C, a plurality of slit-like openings 34 extending from the end face 33b along the longitudinal direction of the other end 33 (connecting pipe 28) may be formed, and in the circumferential direction of the peripheral wall 33a. A plurality of extending arc-shaped openings may be formed. Moreover, you may comprise the other end part 33 by deform | transforming the mesh-shaped board member which has many meshes into a cylindrical shape.

It is sectional drawing which shows schematically the structure of the dew condensation suppression apparatus which concerns on 1st Embodiment of this invention, and a test apparatus provided with the same. It is explanatory drawing which shows an example of a structure of the deformation | transformation forced part of a dew condensation suppression apparatus. It is sectional drawing which shows schematically the structure of the exhaust unit attached to the box of a dew condensation suppression apparatus. 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. It is sectional drawing which shows the modification of the deformation | transformation forced part of a dew condensation suppression apparatus. (A) is sectional drawing which shows the modification of the air flow ensuring means of a dew condensation suppression apparatus, (B) is a perspective view of an air flow ensuring means, (C) is other of the air flow ensuring means It is a perspective view which shows a modification.

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 Heat insulation panel wall 18 Bag body 22 Box body 23 Cover 24 Bottom member 26 Net-like board member (air distribution ensuring means)
28 Connecting pipe 50 Deformation forcing part 51 Pneumatic pressure adjustment part 52 Air supply part 56 Control part G Space W Sample

Claims (9)

A dew condensation suppression device that suppresses the occurrence of dew condensation due to the intrusion of outside air into a closed space where the internal pressure can rise and fall,
As the internal pressure increases, the air expands due to the air flowing in from the closed space, and as the internal pressure decreases, the air flows out into the closed space and contracts, thereby reducing the internal pressure of the closed space. A pressure adjusting unit having an airbag for mitigating fluctuations;
A deformation forcing portion capable of forcibly shrinking the airbag ,
The pressure adjusting unit includes an air flow securing means that regulates how the airbag is contracted by the deformation forcing unit and can secure the air flow from the inside of the airbag to the closed space,
The air flow securing means is formed with a plurality of openings for circulating air from inside the airbag to the closed space,
The said airbag is a dew condensation suppression apparatus provided so that the part in which the said some opening was formed among the said air distribution ensuring means was covered . The dew condensation suppressing device according to claim 1 , wherein the air flow ensuring means includes a plate member disposed between the closed space and the airbag.
Wherein the plurality of openings, dew condensation suppression devices that are made form the plate member. The dew condensation suppressing device according to claim 2 , wherein the plurality of openings are formed over the entire surface of the plate member. The dew condensation suppressing device according to claim 1 , wherein the air flow securing means is a cylindrical member disposed so as to extend into the airbag,
The said several opening is a dew condensation suppression apparatus currently formed in the surrounding wall of the said cylindrical member. The dew condensation suppressing device according to any one of claims 1 to 4 , wherein the pressure adjusting unit further includes a box that houses the airbag,
The said deformation | transformation forced part is connected in the said box, and the condensation suppression which forcibly shrinks the said airbag by supplying air in the space formed between the said box and the said airbag apparatus. 6. The dew condensation suppressing device according to claim 5 , wherein the deformation forcing part forcibly inflates the airbag by sucking air in the space formed between the box and the airbag. Condensation suppression device with a function to The dew condensation suppressing device according to any one of claims 1 to 4 , wherein the deformation forcing unit drives the movable member and a movable member that presses the airbag and forcibly contracts the airbag. A dew condensation suppression device including a drive unit. 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 closed space of the test chamber.
Environmental test equipment with A test chamber that is surrounded by an insulating panel wall in which a closed space is formed between the inner and outer walls, and that applies a thermal load to the sample by changing the ambient temperature;
The dew condensation suppressing device according to any one of claims 1 to 7 , wherein the dew condensation suppressing device is attached to the closed space of the heat insulation panel wall and suppresses the occurrence of dew condensation in the closed space.
Environmental test equipment with

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