JP7428838B2 - environmental test equipment - Google Patents

Description

The present invention relates to an environmental test device that can perform environmental tests in a ventilated test area.

Aircraft, vehicles, trains, etc. are exposed to wind when they fly or drive. Therefore, in order to reproduce the environment such as when an aircraft or vehicle is running and evaluate the influence of driving wind, etc., the test area may be made into a ventilation environment and the test object is exposed in that environment to perform the desired test. (hereinafter referred to as ventilation test).
Additionally, there is a demand for conducting ventilation tests in a state where the temperature and humidity of the air being applied to the specimen are controlled.
An example of an apparatus that can perform such a ventilation test is a wind tunnel test apparatus as disclosed in Patent Document 1, for example.

Japanese Patent Application Publication No. 2012-173245

The wind tunnel test apparatus disclosed in Patent Document 1 is for conducting a ventilation test by installing the entire automobile in a test area. Although the wind tunnel testing device disclosed in Patent Document 1 has high performance, there is a problem in that the device itself is very large-scale.
Therefore, it is not suitable for use in conducting ventilation tests on parts of automobiles or aircraft, for example.
The present invention focuses on the above-mentioned problems of the prior art, and aims to develop an environmental testing device suitable for conducting ventilation tests on relatively small objects such as individual parts. be.

An aspect of the related invention for solving the above problems includes an air-conditioned chamber and a ventilation means, and a cylindrical ventilation duct is installed in the chamber, and the ventilation duct has openings at both ends. is provided, one of the openings is opened into the chamber, and a detour flow path that detours around the ventilation duct is provided in the chamber and around the ventilation duct, and the ventilation duct is connected to the ventilation duct. It has an airflow adjustment means that changes the ratio of the amount of air that is passed through and the amount of air that flows through the detour flow path, and it is possible to install the specimen in the ventilation duct and expose the specimen to an air-conditioned ventilation environment. This is an environmental test device characterized by:
In the above aspect, it is preferable that the one opening is a discharge side opening configured such that the end of the ventilation duct is entirely open.
Another aspect (related invention) for solving the above-mentioned problems includes an air-conditioned chamber and a ventilation means, a ventilation duct is installed in the chamber, and the ventilation duct is installed in the chamber. a bypass flow path that bypasses the ventilation duct, a ventilation adjustment means that changes the ratio of the amount of air that passes through the ventilation duct and the amount of air that bypasses the ventilation duct, and a specimen is installed in the ventilation duct. The environmental test device is characterized in that it is possible to expose the specimen to an air-conditioned ventilation environment.

The environmental test device of this embodiment has a ventilation duct installed in an air-conditioned chamber. Additionally, there is a detour flow path in the chamber that detours around the ventilation duct. Then, the ratio of the amount of air that passes through the ventilation duct and the amount of air that bypasses the ventilation duct can be changed by the air amount adjustment means.
The environmental test device of this embodiment can have a much smaller overall shape and test area than the device disclosed in Patent Document 1, and is suitable for use in conducting ventilation tests on relatively small specimens. Are suitable.

In the above aspect, it is preferable that the blowing means includes an air conditioning blowing means and a blowing means for generating a blowing load, and the blowing means for generating a blowing load is installed outside the chamber.

According to this aspect, the specimen can be exposed to a relatively high-speed ventilation environment by keeping the amount of air blown by the air-conditioning blowing means constant, and by also installing a relatively large blowing means for generating a blowing load.

In the aspect described above, it is preferable that the blowing means for generating a blowing load sucks air in the chamber and sends the air to the ventilation duct and the detour flow path.

According to this aspect, the overall shape and the test area can be further miniaturized. In addition, stable temperature or temperature/humidity control can be achieved regardless of the amount of air blown through the ventilation duct.

In the above aspect, the chamber has a door that opens and closes the chamber, and the ventilation duct is arranged in a position that allows air to pass in a horizontal direction when viewed from the open state of the door, and the ventilation duct has at least a part of the ventilation duct. Preferably, it is possible to take the specimen into and out of the ventilation duct by removing or opening it.

According to this aspect, it is easy to take the specimen into and out of the ventilation duct.

In the above aspect, the chamber has a door that opens and closes the chamber, and the ventilation duct is arranged in such a manner that air passes from the rear direction to the front direction when viewed from the open state, and the ventilation duct is disposed within the ventilation duct. It is also recommended to have a configuration that allows the specimen to be taken in and taken out.

According to this aspect, it is easy to take the specimen into and out of the ventilation duct.

The environmental test device of the present invention can reduce the overall shape and test area, and is suitable as an environmental test device for conducting ventilation tests on relatively small objects.

1 is a system diagram of an environmental test device according to an embodiment of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view which shows the external appearance of the environmental test apparatus of embodiment of this invention. FIG. 3 is a conceptual diagram of the AA cross section of the chamber portion of the environmental test device in FIG. 2; FIG. 3 is a conceptual diagram of the BB cross section of the chamber section of the environmental test device in FIG. 2; It is an explanatory view conceptually explaining the flow of air in a chamber part. It is an exploded perspective view of a ventilation duct. FIG. 3 is a system diagram of an environmental test device according to another embodiment of the present invention. FIG. 7 is a conceptual diagram of a cross section of an environmental test device according to another embodiment of the present invention.

Embodiments of the present invention will be further described below. The environmental test apparatus 1 of this embodiment is an apparatus that uses a specimen 300 as a component of an aircraft, a vehicle, a train, etc., and can test performance and durability by exposing the specimen 300 to a ventilation environment.
As shown in FIG. 1, the environmental test device 1 includes a main body 100 and a running wind generating section 200.
The main body 100 has a heat insulating tank 3 defined by a heat insulating wall 2, as shown in FIG. A partition member 5 is provided inside the heat insulating tank 3, and the inside of the heat insulating tank 3 is divided into an air conditioning section 6 and a chamber section 7.

Inside the air conditioning unit 6, an air conditioning device 8 and a blower 10 are arranged. The air conditioner 8 includes a cooling device 11 and a heater (heating device) 12. Note that in addition to this, a humidifying device may be built-in.
The air conditioning unit 6 has an air conditioning ventilation passage 15 that communicates with the chamber portion 7 in an annular manner, and the air conditioning equipment 8 and the blower 10 described above are built into the air conditioning ventilation passage 15. Hereinafter, the blower 10 of the air conditioning unit 6 will be referred to as an air conditioning blower 10. The air conditioning blower 10 is controlled by an inverter, and its rotation speed can be changed.

The air conditioning ventilation passage 15 is formed in a part of the heat insulating tank 3 and communicates with the chamber part 7 at two places, an air blowing part 16 and an air introducing part 17.
When the air conditioning blower 10 is started, air in the chamber section 7 is introduced into the air conditioning ventilation path 15 from the air introduction section 17. As a result, the air conditioning ventilation path 15 becomes ventilated, and air comes into contact with the air conditioner 8 to perform heat exchange. The temperature-adjusted air is then blown out from the air blowing section 16 into the chamber section 7 . In this way, the chamber section 7 is a space that is air-conditioned by air introduced from the air conditioning section 6.

In the environmental test apparatus 1 of this embodiment, a ventilation duct 20 is disposed within the chamber section 7. The ventilation duct 20 is cylindrical and can be said to be a small wind tunnel. The ventilation duct 20 has openings at both ends. One opening is the air introduction side opening 26, and only a part of the cylindrical cross section is open. The other opening is an air discharge side opening 27, and the entire cylindrical cross section is open.
The air introduction side opening 26 is provided with a louver (wind direction adjustment member) 47 for adjusting the wind direction.
The ventilation duct 20 occupies a part of the area within the chamber section 7 . Conversely, there is a space around the ventilation duct 20. In this embodiment, the space within the chamber portion 7 and around the ventilation duct 20 functions as the detour flow path 21 .
The ventilation duct 20 is provided with a small hole 18 for measuring wind speed.
A specimen 300 is placed inside the ventilation duct 20.

A main passage opening 22, a secondary passage opening 23, and an intake opening 25 are provided on the wall surface of the chamber portion 7.
The main passage opening 22 opens at a position facing the air introduction side opening 26 on one end side of the ventilation duct 20. The main passage opening 22 and the air introduction side opening 26 of the ventilation duct 20 are connected by a short connecting member 45.
The auxiliary channel opening 23 opens at a position facing the detour flow path 21, away from the air introduction side opening 26 of the ventilation duct 20. The intake opening 25 opens at a position away from the main passage opening 22 and the secondary passage opening 23 described above.

The traveling wind generating section 200 has a blower 30. Hereinafter, the blower 30 will be referred to as a running air blower (air blower for generating air blowing load) 30.
The traveling wind generating section 200 has an air path that connects the aforementioned traveling wind blower 30 and the chamber section 7 . All air passages are composed of ducts.
As one of the air passages, there is a suction passage 31 that connects the intake opening 25 of the chamber section 7 and the intake part of the traveling wind blower 30.
Further, the discharge side of the running air blower 30 branches into a main supply path 35 and a sub-supply path 36, each of which is connected to the chamber section 7. The main supply path 35 is a flow path that connects the discharge side of the traveling air blower 30 and the main path opening 22 of the chamber section 7 . The sub-supply path 36 is a flow path that connects the discharge side of the traveling air blower 30 and the sub-path opening 23 of the chamber section 7 .

Further, dampers 37 and 38 are provided in the main supply path 35 and the sub supply path 36. In order to distinguish between the two, the damper 37 attached to the main supply passage 35 is referred to as a main passage damper 37, and the damper 38 attached to the sub supply passage 36 is referred to as an auxiliary passage damper 38.
The opening degree of both the main path damper 37 and the secondary path damper 38 can be adjusted by a motor (not shown). In the present embodiment, the main path damper 37 and the secondary path damper 38 function as an air blow adjustment means that changes the ratio of the amount of air that passes through the ventilation duct 20 and the amount of air that bypasses the ventilation duct 20.
Further, an air flow meter 50 is attached to the main supply path 35.

A first temperature sensor 40 and a second temperature sensor 41 are provided within the chamber section 7 . The first temperature sensor 40 is provided near the air blowing section 16 of the chamber section 7.
The second temperature sensor 41 is installed within the connection member 45.
The environmental test device 1 includes a temperature regulator 42 and a flow rate regulator 43.
Detection signals from the first temperature sensor 40 and the second temperature sensor 41 described above are input to the temperature regulator 42 . Furthermore, the air conditioner 8 is controlled by the output of the temperature regulator 42 . In this embodiment, the air conditioning unit 6 is mainly controlled by the temperature of the air blowing from the air conditioning unit 6 detected by the first temperature sensor 40, and the air conditioning unit 6 is controlled by the temperature inside the connecting member 45 detected by the second temperature sensor 41. Corrected. Note that the temperature inside the connecting member 45 is substantially the same as the temperature of the air supplied into the ventilation duct 20.

Furthermore, a detection signal from the airflow meter 50 is input to the flow rate regulator 43 . Then, the opening degrees of the main passage damper 37 and the secondary passage damper 38 are adjusted by the output signal of the flow rate regulator 43.

Next, the functions of the main body section 100 and the running wind generating section 200 will be explained.
The main body part 100 can create a desired temperature environment in the chamber part 7 by itself. That is, the chamber section 7 is an air-conditioned chamber.
The air conditioning blower 10 of the main body 100 is driven to ventilate the air conditioning ventilation path 15, and the air conditioning equipment 8 is controlled so that the detected value of the first temperature sensor 40 approaches the temperature of the set environment.

By operating the air conditioning blower 10, the air in the chamber section 7 is introduced from the air introduction section 17 into the air conditioning ventilation path 15, passes through the air conditioning equipment 8 in the air conditioning ventilation path 15, and the temperature is adjusted. The temperature-adjusted air is then returned to the chamber section 7 from the air blowing section 16, and a desired temperature environment is created within the chamber section 7.

By driving the traveling wind generator 200 in this state, the inside of the ventilation duct 20 becomes a ventilation environment, and the specimen 300 inside the ventilation duct 20 is exposed to the ventilation environment at a desired temperature and a desired wind speed.
That is, when the running wind blower 30 of the running wind generating section 200 is driven, air in the chamber section 7 is sucked into the running wind blower 30 through the suction path 31 from the intake opening 25 of the chamber section 7 . Then, the sucked air is discharged from the discharge section of the running air blower 30 and enters the chamber section 7 via the main supply path 35 and the sub supply path 36.

In this embodiment, the traveling wind generating section 200 constitutes an air conditioning flow path that communicates with the chamber section 7 in an annular manner, and sucks air in the chamber section 7 and returns it to the chamber section 7 .
Here, the inside of the chamber section 7 is air-conditioned by the air conditioning section 6 and maintained at a desired temperature. In this embodiment, since the running wind generating section 200 sucks the air in the chamber section 7 and returns it to the chamber section 7, the air blown from the running wind generating section 200 into the chamber section 7 is temperature-controlled in the first place. It's a nice atmosphere.

In this embodiment, air passing through the main supply path 35 of the traveling wind generating section 200 is introduced into the chamber section 7 from the main path opening 22. The main passage opening 22 opens at a position facing the air introduction side opening 26 of the ventilation duct 20. The main passage opening 22 and the ventilation duct 20 are connected by a connecting member 45. Therefore, substantially the entire amount of air discharged from the main passage opening 22 is introduced into the ventilation duct 20.

In this embodiment, the air flowing through the main supply path 35 is directly introduced into the ventilation duct 20, and the wind speed within the ventilation duct 20 increases to generate wind. That is, the inside of the ventilation duct 20 becomes a ventilation environment. As described above, the air flowing through the main supply path 35 is air sucked from inside the chamber section 7 and is temperature-controlled air, so the ventilation duct 20 contains air that has been adjusted to a predetermined temperature. It will pass.
The air that has passed through the ventilation duct 20 is exhausted into the chamber section 7 through the air discharge side opening 27.

On the other hand, the air passing through the sub-supply passage 36 is introduced into the chamber part 7 from the sub-passage opening 23, but the sub-passage opening 23 is opened at a position away from the air introduction side opening 26 of the ventilation duct 20. There is.
Therefore, the air flowing through the sub-supply passage 36 does not enter the ventilation duct 20 but flows through the detour passage 21 around the ventilation duct 20.

Air flowing through any of the flow paths is sucked into the intake opening 25 and returns to the traveling wind generating section 200.
Further, in this embodiment, the main supply channel 35 is provided with a main channel damper 37, and the sub supply channel 36 is provided with a sub channel damper 38, and the opening degrees of both are adjusted by the flow rate regulator 43. Therefore, the ratio of the amount of air that passes through the ventilation duct 20 and the amount of air that bypasses the ventilation duct 20 and flows through the detour channel 21 in the chamber portion 7 can be adjusted. As a result, the wind speed within the ventilation duct 20 can be adjusted to a desired wind speed.
In this manner, in this embodiment, air adjusted to a desired temperature passes through the ventilation duct 20 at a desired wind speed. Therefore, air at a desired temperature is blown onto the specimen 300.

The outline of the environmental test device 1 has been described above with reference to the system diagram. Next, the configuration of the environmental test device 1 will be explained in more detail. Note that the same members as those explained in the system diagram of FIG. 1 are given the same numbers, and redundant explanation will be omitted.

The environmental test device 1 shown in FIG. 2 has a flow path configuration similar to that shown in the system diagram of FIG.
As shown in FIG. 2, the environmental test device 1 includes a main body 100 and a running wind generating section 200. A door 60 is provided on the front of the main body 100, as shown in FIGS. 2 and 3.
The main body 100 has a heat insulating tank 3 defined by a heat insulating wall 2, as shown in FIG.
The heat insulating tank 3 is a casing formed of a heat insulating wall 2, and has an opening 61 on the front surface, and a door 60 is provided in the opening 61. A partition member 5 is provided inside the heat insulating tank 3 to divide it into an air conditioning section 6 and a chamber section 7.

Inside the air conditioning unit 6, an air conditioning device 8 and an air conditioning blower 10 are arranged.
In this embodiment, the air blowing part 16 is provided at the upper part of the partition member 5, and the air introduction part 17 is provided at the lower part of the partition member 5.
The air conditioning unit 6 has an air conditioning ventilation passage 15 that communicates with the chamber portion 7 in an annular manner, and the air conditioning equipment 8 and the air conditioning blower 10 described above are built into the air conditioning ventilation passage 15.
The air conditioning ventilation passage 15 communicates with the chamber section 7 at two locations: an air blowing section 16 and an air introducing section 17.

A ventilation duct 20 is arranged within the chamber section 7. The ventilation duct 20 occupies a part of the area within the chamber section 7 . There is a space around the ventilation duct 20 that functions as a detour flow path 21.
The ventilation duct 20 is a tube with a rectangular cross-sectional shape, as shown in FIGS. 5 and 6. The ventilation duct 20 has a top wall 63, a bottom wall 65, and a front side wall 66 and a back side wall 67 that connect the two. Openings are provided at both ends of the ventilation duct 20.
In this embodiment, at least one surface of the ventilation duct 20 is removable. In this embodiment, as shown in FIG. 6, the front side wall 66 is removable. Further, part or all of one side wall of the ventilation duct 20 may be opened.

The ventilation duct 20 is arranged with its opening facing the left and right side walls 70 and 71 of the chamber section 7 with the door 60 open as a reference (see FIG. 4). That is, the ventilation duct 20 is arranged in such a manner that air passes laterally when viewed from the open state of the door 60. Then, the front side wall 66 of the ventilation duct 20 facing the door 60 can be removed.
In this embodiment, by opening the door 60, the front side wall 66 of the ventilation duct 20 faces the operator. Therefore, the operator can open the door 60, remove the front side wall 66, and take the specimen 300 in and out of the ventilation duct 20.

In this embodiment, a main passage opening 22, a secondary passage opening 23, and an intake opening 25 are provided in the side wall 71 on the right side of the drawing (see FIG. 4).
The main passage opening 22 opens at a position facing the air introduction side opening 26 on one end side of the ventilation duct 20. The auxiliary channel opening 23 opens at a position facing the detour flow path 21, away from the air introduction side opening 26 of the ventilation duct 20. The intake opening 25 opens at a position away from the main passage opening 22 and the secondary passage opening 23 described above.

The traveling wind generating section 200 has a traveling wind blower 30. Further, the traveling wind generating section 200 has a suction path 31, a main supply path 35, and a sub supply path 36.
The main body part 100 can create a desired temperature environment in the chamber part 7 by itself.
The air conditioning blower 10 of the main body 100 is operated to ventilate the air conditioning ventilation passage 15, and the air conditioning equipment 8 is controlled so that the detected value of the first temperature sensor 40 approaches the temperature of the set environment.

In this embodiment, the air in the chamber part 7 is introduced into the air conditioning ventilation passage 15 from the air introduction part 17 provided at the lower part of the partition member 5, passes through the air conditioning equipment 8 in the air conditioning ventilation passage 15, and then changes the temperature and humidity. will be arranged. Then, the air whose temperature and humidity have been adjusted is returned to the chamber section 7 from the upper air blowing section 16, and a desired temperature environment is created within the chamber section 7.

By driving the traveling wind generator 200 in this state, the inside of the ventilation duct 20 becomes a ventilation environment, and the specimen 300 inside the ventilation duct 20 is exposed to the ventilation environment at a desired temperature and a desired wind speed.
That is, when the running wind blower 30 of the running wind generating section 200 is driven, air in the chamber section 7 is sucked into the running wind blower 30 through the suction path 31 from the intake opening 25 of the chamber section 7 . Then, the sucked air is discharged from the running air blower 30 and enters the chamber section 7 via the main supply path 35 and the sub supply path 36.
Air passing through the main supply path 35 is introduced into the chamber part 7 from the main path opening 22, but as shown in FIGS. It opens at a position facing the side opening 26.

Therefore, the air flowing through the main supply path 35 is directly introduced into the ventilation duct 20, and the wind speed within the ventilation duct 20 increases. The air introduced into the ventilation duct 20 passes around the specimen 300 and is discharged from the air discharge side opening 27.
The air passing through the sub-supply passage 36 is introduced into the chamber part 7 from the sub-channel opening 23, and as shown in FIGS. The opening is located away from the
Therefore, the air flowing through the sub-supply passage 36 does not enter the ventilation duct 20 but flows through the detour passage 21 around the ventilation duct 20.

Air flowing through any of the flow paths is sucked into the intake opening 25 and returns to the traveling wind generating section 200.
Further, in this embodiment, the main supply passage 35 is provided with a main passage damper 37, and the sub supply passage 36 is provided with a sub passage damper 38, and the opening degrees of both are adjusted by the flow rate regulator 43. Therefore, the ratio of the amount of air that passes through the ventilation duct 20 and the amount of air that bypasses the ventilation duct 20 and flows through the detour channel 21 in the chamber portion 7 is adjusted. As a result, the wind speed within the ventilation duct 20 can be adjusted to a desired wind speed.
Further, according to this embodiment, stable temperature or temperature/humidity control can be performed regardless of the amount of air blown by the ventilation duct 20.

In the embodiment described above, the ventilation duct 20 is arranged with its opening facing the left and right side walls 70 and 71 of the chamber section 7 with the door 60 open as a reference (see FIG. 4).
However, the present invention is not limited to this layout, and as in an environmental test apparatus 400 shown in FIG. It may be placed in a position where

The environmental test device 1 described above is composed of a main body section 100 and a running wind generating section 200, as shown in FIGS. 1 and 2.
In the above-described environmental test device 1, the air conditioning blower 10 is provided in the main body 100, and the traveling wind generating section 200 has the traveling wind blower 30.
According to this aspect, strong wind can be generated in the ventilation duct 20.
However, the present invention is not limited to this configuration, and either one of the blowers can be omitted.

For example, as in an environmental test apparatus 80 shown in FIG. 7, a pressure equalizing space 81 is provided within the chamber section 7 and downstream of the air blowing section 16. The environmental test device 80 has an intra-chamber main supply path 82 that communicates between the pressure equalization space 81 and the ventilation duct 20, and an intra-chamber sub-supply path 83 that communicates between the pressure equalization space 81 and the periphery of the ventilation duct 20.
Furthermore, dampers 85 and 86 are provided in the chamber main supply path 82 and the chamber sub-supply path 83.

In the environmental test device 80 of this embodiment, the dampers 85 and 86 function as an air blow adjustment means that changes the ratio of the amount of air that passes through the ventilation duct 20 and the amount of air that bypasses the ventilation duct 20.
Also in the environmental test device 80 of this embodiment, a desired temperature environment is created in the chamber section 7 by operating the air conditioning blower 10.

In addition, by adjusting the opening degree of the dampers 85 and 86, the amount of air to be blown through the ventilation duct 20 via the main supply path 82 in the chamber and the detour flow in the chamber section 7 via the auxiliary supply path 83 in the chamber can be changed. The rate of air flow through channel 21 is adjusted. As a result, the inside of the ventilation duct 20 can be adjusted to a desired wind speed.

In the embodiment described above, the air conditioning section 6 and the chamber section 7 are combined to form the main body section 100, but the air conditioning section 6 and the chamber section 7 may be separate bodies.

In the embodiment described above, a set of two dampers 37, 38, 85, and 86 whose opening degrees can be changed are employed as the air blow adjustment means. Although this configuration is recommended, the member that adjusts the opening degree is not limited to a damper, but may be a valve. Alternatively, one valve may be used to adjust the opening degrees of two channels, such as a three-way switching valve.
Alternatively, only one of the main channel damper 37 and the sub-channel damper 38 may be provided, and the ratio of the amount of air blown to each flow channel may be changed. The same applies to the dampers 85 and 86, and only one of them may be provided.

In this embodiment, since the dampers 37, 38, 85, and 86 are employed as the ventilation adjustment means, the ratio of the amount of air passing through the ventilation duct 20 to the amount of air passing around the ventilation duct 20 varies widely. Moreover, the air blowing rate can also be changed rapidly.
Therefore, for example, it is possible to simulate driving wind conditions such as idling, acceleration, constant speed cruising, and deceleration of a car.

In the embodiment described above, the ventilation duct 20 is a tube with a rectangular cross-sectional shape, but the cross-sectional shape of the ventilation duct 20 is not limited, and may be circular or semicylindrical.

1, 80, 400 Environmental test device 6 Air conditioning section 7 Chamber section 10 Air conditioning blower 20 Ventilation duct 21 Detour channel 22 Main passage opening 23 Side passage opening 25 Intake opening 30 Traveling wind blower (air blower for generating air blowing load) )
37 Main path damper (ventilation adjustment means)
38 Sideway damper (ventilation adjustment means)
80 Environmental test equipment 85, 86 Damper (ventilation adjustment means)
100 Main body part 200 Traveling wind generating part 300 Specimen

Claims (1)

It has an air-conditioned chamber and a ventilation means,
A cylindrical ventilation duct is installed in the chamber, the ventilation duct is provided with openings at both ends, and one of the openings is opened into the chamber,
There is a detour flow path that detours around the ventilation duct in the chamber and around the ventilation duct,
It has a ventilation adjustment means that changes the ratio of the amount of air passing through the ventilation duct and the amount of air flowing through the bypass flow path,
It is possible to install the specimen in the ventilation duct and expose the specimen to an air-conditioned ventilation environment,
The environmental testing device is characterized in that the one opening is a discharge side opening configured such that an end of the ventilation duct is entirely open.

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