JP5582665B2 - Thermal insulation box and environmental test equipment - Google Patents

Description

  The present invention relates to a heat insulation box capable of dehumidifying an internal space sandwiched between an inner tub and an exterior, and an environmental test apparatus including the heat insulation box.

  Environmental testing devices that can evaluate the performance and durability of various products and articles ranging from electronic devices such as mobile phones and industrial products to clothing are effectively used. Environmental test equipment is often composed of a double structure consisting of an inner tank (inner wall) and an outer wall (outer wall). By placing a heat insulating material such as glass wool in the inner space between the inner tank and the outer wall, The temperature distribution in the test chamber surrounded by the tank can be stabilized, and the intended environmental test can be performed.

  Further, as an environmental test apparatus, a constant temperature and humidity chamber (a constant temperature and humidity chamber) in which an inner tank (inner wall) is made of a durable material such as a stainless steel plate and can withstand severe environmental conditions is disclosed in Patent Document 1. Is disclosed.

JP-A-7-108182

  In a general constant temperature and humidity chamber, the settable temperature range is as wide as -40 degrees Celsius to 150 degrees Celsius, and the humidity range is 20% rh to 98% rh (Percent Relative Humidity; relative humidity). Testing under a wide variety of conditions is possible.

However, due to the effects of harsh environmental tests over many years and the effects of chemical substances discharged from various samples, the inner walls and welds that partition the test chambers of robust environmental test equipment corrode and pinholes are generated. Or the airtightness of the sealing material of the through-hole part of an inner tank (inner wall) may fall.
As a result, high-humidity gas in the test chamber surrounded by the inner tank (inner wall) may leak into the space between the inner tank and the exterior, and heat insulating material such as glass wool that is weak against water absorbs moisture and heat insulation. There is a risk of reducing the effect.

  Environmental test equipment with reduced heat insulation cannot maintain the temperature distribution in the test chamber surrounded by the inner tank (inner wall) uniformly, and the temperature distribution in the test chamber is biased, making it difficult to perform the desired environmental test. It becomes. However, it is extremely difficult to completely prevent high-humidity gases in the test chamber from entering the space between the inner tank and the exterior, and measures are required to ensure good environmental testing. It is.

  Therefore, an object of the present invention is to provide a heat insulating box capable of dehumidifying an internal space sandwiched between an inner tub and an exterior, and an environmental test apparatus including the heat insulating wall.

  The structure for solving the above-mentioned problem is that in the heat insulation box that performs the test on the DUT or the processing on the work inside, the heat insulation wall constituting the wall body has an inner wall and an outer wall, and the inner wall and the outer wall It is a heat insulating wall in which a heat insulating material is arranged in the sandwiched internal space, and it is possible to pressurize the internal space as compared with the inside of the heat insulating box, and communicate with the region in the internal space where the heat insulating material is arranged. And dehumidifying means for dehumidifying the dehumidifying space, and the air introduced to pressurize the internal space is dehumidified and then introduced into the region where the heat insulating material is disposed in the internal space. It is the heat insulation box characterized by that.

Further, the invention according to claim 1 for solving the above-described problem is a heat insulation box that internally performs a test on a test object or a process on a workpiece, and the heat insulation wall constituting the wall body includes an inner wall and an outer wall. A heat insulating wall in which an insulating material is disposed in an internal space sandwiched between the inner wall and the outer wall, and a communication pipe that communicates the inside and the outside of the internal space is provided, and dehumidification is provided in the internal space or the communication pipe A space is provided, has a dehumidifying means for dehumidifying the dehumidifying space, and has a cooling device for cooling the inside of the heat insulating box after air is dehumidified and introduced into the region where the heat insulating material is disposed in the internal space. The cooling device includes a compressor, a condenser, an expansion valve, and an evaporator, and a pipe is connected between them to form a series of refrigeration cycles. The piping or evaporation from the expansion valve to the evaporator Depending on the part of the piping from the compressor to the compressor, Configure the serial dehumidifier, the air introduced into the dehumidification space is introduced into the inner space from being dehumidified in contact with the dehumidifying means is a heat insulating box according to claim Rukoto.

  In the invention of claim 1, the dehumidifying space is provided in the internal space of the heat insulating wall or in the communication pipe described later. The dehumidifying space communicates with a region where the heat insulating material in the internal space is disposed, and has a dehumidifying means for dehumidifying the dehumidifying space, thereby preventing the heat insulating material from absorbing moisture and causing dew condensation. Thereby, the fall of the heat insulation effect of a heat insulating material can be prevented. Therefore, the performance of making the temperature distribution in the heat insulation box uniform can be kept normal.

  In addition, by being able to pressurize the internal space as compared to the inside of the heat insulation box, the internal space becomes hot and expands and the pressure increases when a test such as heating and cooling is repeated inside. In addition, the respiration of the internal space and the outside air, which is generated when the internal space becomes low temperature and contracts and the pressure is reduced, can be efficiently dehumidified by being aggregated through the dehumidification space.

In invention of Claim 1 , it has a cooling device which cools the inside of a heat insulation box, and comprises dehumidification means by a part of piping from an expansion valve to an evaporator or piping from an evaporator to a compressor, Installation of a new device such as a dehumidifier becomes unnecessary. That is, since it can dehumidify using the piping of the cooling device for an environmental test, generation | occurrence | production of a new expense can be suppressed and it can contribute significantly to cost reduction.

  Further, the air introduced into the dehumidifying space is dehumidified in contact with the dehumidifying means and then introduced into the internal space, thereby preventing entry of water vapor from the outside.

A second aspect of the present invention is the heat insulation box according to the first aspect , wherein the pipe constituting the dehumidifying means is provided in a position connected to the dehumidifying space or the dehumidifying space.

In the invention of claim 2 , the pipe constituting the dehumidifying means is provided in the dehumidifying space or at a position connected to the dehumidifying space. As a result, dehumidification is possible in the dehumidifying space or a position connected to the dehumidifying space, and it is possible to prevent condensation in the internal space and moisture absorption by the heat insulating material.

A third aspect of the present invention is the heat insulation box according to the first or second aspect, wherein the interior space can be pressurized via the communication pipe.

In the invention of claim 3 , it is possible to pressurize (positive pressure) the interior space. As a result, it is possible to prevent the gas in the test chamber from flowing into the internal space from a hole or the like generated in the inner tank (inner wall) due to corrosion or the like. That is, it is possible to prevent water vapor contained in the gas in the test chamber from flowing into the internal space.

According to a fourth aspect of the present invention, in any one of the first to third aspects, the condenser is an air-cooled heat exchanger and has a blower. It is a heat insulation box characterized by being pressurized.

In the invention of claim 4 , it is not necessary to install a new device (blower) by applying pressure (positive pressure) in the internal space by blowing air from the condenser fan. That is, since it can be pressurized (positive pressure) using the blower included in the condenser of the cooling device, the generation of new costs can be suppressed and the cost can be greatly reduced. Moreover, since the high-temperature air generated from the condenser can be introduced into the dehumidification space by blowing air from the blower, the dehumidification speed in the dehumidification space can be accelerated.

A fifth aspect of the present invention is the heat insulation box according to any one of the first to fourth aspects, wherein drainage in the internal space can be discharged through the dehumidifying space.

In the invention of claim 5 , the drain generated in the internal space can be discharged through the dehumidifying space. That is, by sequentially discharging the generated drain, the drain does not accumulate in the dehumidification space, and therefore, re-evaporation of the drain in the dehumidification space can be prevented.

A sixth aspect of the present invention is the heat insulation box according to any one of the first to fifth aspects, wherein a desiccant is disposed in the dehumidifying space.

In the invention of claim 6 , since the desiccant is arranged in the dehumidifying space, the dehumidifying capacity of the dehumidifying space can be enhanced.

A seventh aspect of the present invention is an environmental test apparatus comprising the heat insulation box according to any one of the first to sixth aspects.

In the invention of claim 7 , by providing the environmental test apparatus with the heat insulating box according to any one of claims 1 to 6 , the heat insulating material can be prevented from containing water vapor, the heat insulating function of the heat insulating material is maintained, and the heat insulating box The performance of making the temperature distribution in the inside uniform can be maintained. Therefore, the target environmental test can be performed.

  ADVANTAGE OF THE INVENTION According to this invention, the environmental test apparatus provided with the heat insulation box which can dehumidify the internal space pinched | interposed by the inner tank and the exterior, and the said heat insulation wall can be provided.

It is a schematic block diagram of the heat insulation box of embodiment of this invention, and an environmental test apparatus. It is an expanded block diagram of the dehumidification space of the environmental test apparatus of FIG. It is an expanded block diagram of the dehumidification space of an environmental test apparatus which shows the modification of embodiment of this invention.

  The configuration of the heat insulation box and the environmental test apparatus according to the embodiment of the present invention will be described with reference to the drawings. The description is intended to facilitate understanding of the embodiment, and the present invention should not be understood as being limited thereby.

  In FIG. 1, the environmental test apparatus 1 includes a constant temperature and humidity chamber 2. The constant temperature and humidity chamber 2 is a heat insulating box 4 surrounded by a heat insulating wall 3. The heat insulating wall 3 includes an inner wall 5 (inner tub 13) and an outer wall 6 (exterior 14), and a heat insulating material 8 disposed in an inner space 7 sandwiched between the inner wall 5 and the outer wall 6. That is, the heat insulating wall 3 includes the inner wall 5, the heat insulating material 8, and the outer wall 6. In addition, as the heat insulating material 8, it is desirable to arrange a heat insulating material such as glass wool.

The inner wall 5 and the outer wall 6 are wall bodies made of a durable material such as a stainless steel plate.
The heat insulating box 4 includes a test chamber 10 surrounded by an inner wall 5 and a casing 11 surrounded by an outer wall 6.

  The heat insulating wall 3 is provided with a pressure equalizing hole 12 that communicates the inside of the test chamber 10 and the outside of the housing 11. The pressure equalizing hole 12 can maintain the atmospheric pressure in the test chamber 10 at the same level as the atmospheric pressure outside the constant temperature and humidity chamber 2. Although the atmospheric pressure differs depending on the installation location of the thermo-hygrostat 2, it may be considered to be about 1 atmosphere (about 1013 hectopascals [hpa]) in a general place. The constant temperature and humidity chamber 2 includes a door 9 having the same structure as the heat insulating wall 3.

A dehumidifying chamber 15 is provided in the internal space 7. The dehumidifying chamber 15 is configured by a dehumidifying space 16 in which the heat insulating material 8 such as glass wool disposed in the internal space 7 is partially removed.
As shown in FIGS. 1 and 2, a communication pipe 20 that communicates the inside and outside of the internal space 7 is provided at the bottom 17 of the dehumidifying chamber 15. In the dehumidifying chamber 15, a refrigerant pipe 31 (a part of the refrigerant pipe 31 extending from the expansion valve 34 to the evaporator 35) of a refrigeration circuit 30 (FIG. 1) to be described later is disposed. (Dehumidifying means) is configured. Further, a desiccant 19 is provided in the dehumidifying chamber 15. Note that the end portion 21 of the communication pipe 20 is widened and opened in a trumpet shape, and a fan 38 described later is disposed at a position facing the end portion 21 of the communication pipe 20.

  As shown in FIG. 2, the refrigerant pipe 31 is preferably constituted by a metal pipe 40 such as a copper pipe having good heat conduction, and the metal pipe 40 is covered with a pipe heat insulating material 39. In the place which becomes the dehumidifier 18 (dehumidification means) provided in the inside, it does not coat | cover with the piping heat insulating material 39, but the metal piping 40 is exposed.

  The constant temperature and humidity chamber 2 includes a refrigeration circuit 30 (refrigeration cycle), a heater 25, and a humidifier 26 as devices for adjusting the temperature and humidity in the test chamber 10. In addition, illustration and description of the apparatus etc. which control each apparatus are abbreviate | omitted.

  The refrigeration circuit 30 is a device for adjusting the temperature and humidity in the test chamber 10 of the constant temperature and humidity chamber 2, and includes a compressor 32, a condenser 33, an expansion valve 34, and an evaporator 35. Each device from the compressor 32 to the evaporator 35 is connected by a refrigerant pipe 31 to constitute a refrigerator 36. A blower 37 is disposed in the vicinity of the evaporator 35, and a fan 38 is disposed in the vicinity of the condenser 33.

  It is desirable for the fan 38 to have a blowing capacity that does not cause the interior space 7 to expand. In the present embodiment, the fan 38 is set to about 20 hectopascals [hpa]. The fan 38 operates independently of the refrigeration circuit 30 and always operates while the constant temperature and humidity chamber 2 is operating. Since the refrigeration circuit 30 is a known refrigeration cycle, a detailed description is omitted.

  The heater 25 is installed to adjust the temperature in the test chamber 10 of the constant temperature and humidity chamber 2, and the humidifier 26 is installed to adjust the humidity in the test chamber 10 of the constant temperature and humidity chamber 2. ing. In addition, since the heater 25 and the humidifier 26 are well-known things, detailed description is abbreviate | omitted.

  Next, the operation of the dehumidifying device 18 provided inside the heat insulating material 8 in the environmental test apparatus 1 according to the embodiment of the present invention will be described with reference to the drawings.

  As shown in FIG. 2, when the refrigeration circuit 30 operates, a low-temperature refrigerant flows through the refrigerant pipe 31 extending from the expansion valve 34 to the evaporator 35. At this time, the low-temperature refrigerant also flows through the dehumidifying device 18 (the refrigerant pipe 31 provided in the dehumidifying chamber 15) provided in the dehumidifying chamber 15.

  Then, the water vapor contained in the air in the dehumidifying chamber 15 is cooled to the dew point temperature or less, so that it is condensed and liquefied on the surface of the exposed metal pipe 40 (dehumidifying device 18), and is drained as a dehumidifying chamber. 15 is discharged from the communication pipe 20 provided at the bottom 17. Thereby, the inside of the dehumidifying chamber 15 can be dehumidified. That is, the heat insulating material 8 disposed in the internal space 7 of the heat insulating wall 3 can be dehumidified. In addition, since the drain does not accumulate in the dehumidification chamber 15 by the communication pipe 20, it is possible to prevent drain re-evaporation in the dehumidification chamber 15.

  On the other hand, the fan 38 provided in the vicinity of the condenser 33 blows the high-temperature air discharged from the condenser 33 to the dehumidifying chamber 15 through the end 21 of the communication pipe 20. Further, the end portion 21 of the communication pipe 20 is opened in a trumpet shape, the inside space is adjusted to a pressure approximately equal to the atmospheric pressure, and the fan 38 has a blowing capacity of approximately 20 hectopascals (hpa). Therefore, the inside space 7 including the dehumidifying chamber 15 is pressurized to about 1033 hectopascals (hpa) obtained by adding 20 hectopascals (hpa) to 1 atmosphere (about 1013 hectopascals [hpa]) (positive pressure) ).

  The atmospheric pressure in the test chamber 10 is maintained at 1 atmospheric pressure (about 1013 hectopascals [hpa]) by the pressure equalizing hole 12 as much as the atmospheric pressure outside the environmental test apparatus 1 (constant temperature and humidity chamber 2). Yes. Therefore, the atmospheric pressure in the internal space 7 is higher than the atmospheric pressure in the test chamber 10. Thereby, it is possible to prevent the gas in the test chamber 10 from entering the internal space 7 from the holes generated in the inner wall 5 due to corrosion or the like. That is, it is possible to prevent water vapor contained in the gas in the test chamber 10 from entering the heat insulating material 8. Furthermore, when a test in which a high temperature and a low temperature are repeated in the test chamber 10, the internal space 7 becomes high temperature and expands to increase the pressure, or the internal space 7 becomes low temperature and contracts to decrease the pressure. The breathing of the inside space 7 and the outside air generated by the above is concentrated through the communication pipe 20 so that it can be dehumidified efficiently.

  Since high-temperature air is blown into the dehumidifying chamber 15 through the end 21 of the communication pipe 20 by the fan 38, the dehumidifying speed in the dehumidifying chamber 15 can be accelerated. Furthermore, air that has been dehumidified in contact with the dehumidifying device 18 is introduced into the internal space 7 via the communication pipe 20, thereby preventing air containing water vapor from the outside from entering the heat insulating material 8.

Since the refrigerant pipe 31 constituting the dehumidifying device 18 is provided in the dehumidifying chamber 15, dehumidification can be performed in the dehumidifying chamber 15. That is, it is possible to prevent the heat insulating material 8 from condensing.
In addition, since the desiccant 19 is provided in the dehumidifying chamber 15, the dehumidifying capacity of the dehumidifying chamber 15 can be increased, and the dehumidifying chamber 15 can be dehumidified when the refrigeration circuit 30 is not operated. .

  The fan 38 operates independently from the refrigeration circuit 30 and always operates while the thermo-hygrostat 2 is operating. From this, the inside space 7 is pressurized (positive pressure) when the constant temperature and humidity chamber 2 is operated. Therefore, when the constant temperature and humidity chamber 2 is operated, it is possible to prevent water vapor contained in the gas in the test chamber 10 from entering the heat insulating material 8 through the holes generated in the inner wall 5 due to corrosion or the like.

  Note that air or the like may enter the test chamber 10 from the holes generated in the inner wall 5 due to corrosion or the like, the inner wall 5 where the airtightness of the sealing material has decreased, the welded portion, the pressure equalizing hole 12, or the like. Since the refrigeration circuit 30 (refrigeration cycle), the heater 25, and the humidifier 26 are provided as devices for adjusting the temperature and humidity in the chamber 10, the temperature and humidity set for the environmental test are maintained.

  As described above, according to the present embodiment, it is possible to prevent the heat insulating material 8 from absorbing moisture and causing condensation. As a result, the heat insulation effect of the heat insulating material 8 can be prevented from being lowered, and the performance of maintaining the temperature distribution in the test chamber 10 uniformly can be kept normal. That is, in the environmental test apparatus 1, the temperature distribution and the like in the test chamber 10 of the constant temperature and humidity chamber 2 can be steadily stabilized, and the target environmental test can be performed satisfactorily.

  In the present embodiment, the constant temperature and humidity chamber 2 is shown as an example of the environmental test apparatus. However, the present invention is not limited to this, and various environmental tests other than the thermal shock test apparatus and the temperature cycle test apparatus are possible. You may employ | adopt the structure of this invention which can dehumidify the internal space 7 pinched | interposed into the apparatus between the inner wall 5 and the outer wall 6. FIG.

  Moreover, although the example which uses a part of refrigerant | coolant piping 31 from the expansion valve 34 to the evaporator 35 showed the dehumidification apparatus 18 (dehumidification means) as this embodiment, this invention is not limited to this, A part of the refrigerant pipe 31 extending from the evaporator 35 to the compressor 32 may be the dehumidifying device 18 (dehumidifying means), or both may be the dehumidifying device 18 (dehumidifying means).

  Further, as the dehumidifying means, only the refrigerant pipe 31 is used without using the desiccant 19, only the desiccant 19 is used without using the refrigerant pipe 31, or air is blown into the internal space 7 from the fan 38. It is also possible to use only dry air.

  In the present embodiment, the space from which the heat insulating material 8 in the internal space 7 is partially removed is the dehumidifying space 16, but the present invention is not limited to this, and the dehumidifying space 16 communicates with the internal space 7. You may provide in the vicinity which the pipe | tube 20 connects.

  In the present embodiment, an example in which pressurization (positive pressure) and drainage are performed with one communication pipe 20 is shown, but the present invention is not limited to this, and pressurization (positive pressure) It is good also as the communicating pipe 20 of the shape which drained and drained separately.

  As a modification of the present embodiment, as shown in FIG. 3, a configuration in which the desiccant 19 is disposed in the entire dehumidifying chamber 15 (dehumidifying space 16) may be employed.

DESCRIPTION OF SYMBOLS 1 Environmental test apparatus 2 Constant temperature / humidifier 3 Heat insulation wall 4 Heat insulation box 5 Inner wall 6 Outer wall 7 Inner space 8 Heat insulating material 10 Test chamber 11 Case 13 Inner tank 14 Exterior 15 Dehumidification chamber 16 Dehumidification space 18 Dehumidification device (dehumidification means)
20 communication pipe

Claims (7)

In the heat insulation box that performs the test on the DUT or the work on the workpiece inside, the heat insulation wall constituting the wall body has an inner wall and an outer wall, and the heat insulating material is in the inner space sandwiched between the inner wall and the outer wall. A heat insulating wall disposed, provided with a communication pipe that communicates the inside and outside of the internal space, provided with a dehumidification space in the internal space or in the communication pipe, and having dehumidifying means for dehumidifying the dehumidification space, and air After being dehumidified, it is introduced into the area where the heat insulating material is arranged in the internal space ,
It has a cooling device that cools the inside of the heat insulation box. The cooling device has a compressor, a condenser, an expansion valve, and an evaporator, and these are connected by piping to form a series of refrigeration cycles. Yes, the dehumidifying means is constituted by a part of piping from the expansion valve to the evaporator or from the evaporator to the compressor, and after the air introduced into the dehumidifying space is dehumidified in contact with the dehumidifying means heat insulating box, wherein Rukoto is introduced into the inner space. Insulating box of claim 1 pipe constituting the dehumidifying means, characterized that you have provided at a position that leads to dehumidifying space or dehumidifying space. Insulating box according to claim 1 or 2, characterized in can der Rukoto pressurizing the inner space through the communicating pipe. The condenser has a blower to a air-cooled heat exchanger, any one of claims 1 to 3 the internal space blower of the blower is introduced into the dehumidifying space, characterized in Rukoto pressurized Insulation box described in. Insulating box according to any one of claims 1 to 4, characterized in can der Rukoto discharge drain in the internal space through the dehumidifying space. Insulating box according to any one of claims 1 to 5, characterized in Rukoto desiccant is not disposed in the dehumidifying space. An environmental test apparatus comprising the heat insulation box according to claim 1.

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