Environmental test device

Abstract

To enhance an electromagnetic shielding effect in an environmental test device.SOLUTION: The environmental test device includes an insulation chamber 12 including a test chamber 12a and formed using electrically conductive insulation panels 23. The insulation chamber 12 has a chamber body 20 having an entrance / exit and a door body 21 that opens and closes the entrance / exit. The insulation panels 23 forming the chamber body 20 have an outer panel 23a and an inner panel 23b. A radio wave absorber 24 is arranged between the outer panel 23a and the inner panel 23b. The insulation panel 23 forming the chamber body 20 and the insulation panel 23 forming the door body 21 are connected to be electrically conductive.SELECTED DRAWING: Figure 2

Description

[Technical field]

[0001] The present invention relates to an environmental testing device. [Background technology]

[0002] Conventionally, as disclosed in Patent Document 1 below, an environmental test apparatus for performing an environmental test on a specimen has been known. The environmental test apparatus is configured, for example, as a thermostatic chamber, a thermo-hygrostatic chamber, a thermal cycle test apparatus, or the like. In the environmental test apparatus, a test chamber in which a specimen is placed is configured as a space surrounded by a chamber body and a door body that opens and closes a front opening of the chamber body. Both the chamber body and the door body are configured as thermally insulated walls. The thermally insulated walls are made up of a metal plate that forms an inner wall, a metal plate that forms an outer wall, and a thermal insulator disposed in the space between the two metal plates. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 7-270303 Summary of the Invention [Problem to be solved by the invention]

[0004] The environmental testing device disclosed in Patent Document 1 does not have an electromagnetic shielding effect. That is, both the insulating walls constituting the chamber body and the insulating walls constituting the door body are made of metal plates, but the electromagnetic shielding effect cannot be obtained by using metal plates alone. For this reason, the test specimen may be affected by electromagnetic waves from the outside, or electromagnetic waves emitted from the test specimen may leak to the outside.

[0005] An object of the present invention is to improve the electromagnetic shielding effect in an environmental testing device. [Means for solving the problem]

[0006] The environmental testing device according to the present invention includes a test chamber, and is provided with an insulated chamber formed using electrically conductive insulating panels, an air conditioner, and a blower that generates an airflow that causes air conditioned by the air conditioner to flow into the test chamber. The insulated chamber has a chamber body having an entrance and a door body that opens and closes the entrance. The insulating panel that forms the chamber body has an outer panel and an inner panel arranged inside the outer panel. A radio wave absorber is arranged between the outer panel and the inner panel. The insulating panel that forms the chamber body and the insulating panel that forms the door body are electrically connected to each other so that they can be electrically conductive.

[0007] In the present invention, the insulating panel forming the chamber body and the insulating panel forming the door body are electrically connected to each other so that they can be electrically conductive. Therefore, the insulating chamber as a whole becomes conductive, and an electromagnetic shielding effect is obtained. Moreover, since a radio wave absorber is disposed between the outer panel and the inner panel forming the chamber body, radio waves repeatedly reflected between the outer panel and the inner panel are absorbed by the radio wave absorber. Therefore, radio waves can be attenuated within the insulating panel. Thus, the electromagnetic shielding effect can be improved in the environmental testing device. Moreover, since the radio wave absorber is disposed between the outer panel and the inner panel, it is not affected by the air condition (temperature, humidity) in the test chamber. Therefore, even if a high temperature test or a high humidity test is performed, deterioration of the radio wave absorber can be suppressed.

[0008] The insulation panel forming the chamber body may have an opening through which a shaft of the fan is inserted. In this case, a shielding box may be attached to the insulation panel having the opening so as to cover the opening and to be electrically conductive with the insulation panel.

[0009] In this embodiment, not only can the axis of the blower be arranged to pass through the insulating panel, but also it is possible to prevent electromagnetic waves from leaking out through the opening or from entering the insulating room.

[0010] The insulating panel forming the chamber body may have an opening formed therein for drawing out a pipe connected to an evaporator included in the air conditioner from the insulating chamber. In this case, a shielding box may be attached to the insulating panel having the opening formed therein so as to cover the opening and at least a part of the pipe and to be electrically conductive with the insulating panel.

[0011] In this embodiment, not only is it possible to arrange the piping connected to the evaporator so that it passes through the insulation panel, but it is also possible to prevent electromagnetic waves from leaking out through the openings for passing the piping or from entering the insulation room.

[0012] The environmental testing device according to the present invention includes a test chamber, and is provided with an insulated chamber formed using electrically conductive insulating panels, an air conditioner, and a blower that generates an airflow that causes air conditioned by the air conditioner to flow into the test chamber. The insulated chamber has a chamber body having an entrance and a door body that opens and closes the entrance. The insulating panel that forms the chamber body has an outer panel and an inner panel arranged inside the outer panel. The insulating panel that forms the chamber body and the insulating panel that forms the door body are connected to each other so that they can be electrically conductive to each other. An opening is formed in the insulating panel that forms the chamber body, through which the shaft of the blower is inserted. A shielding box is attached to the insulating panel in which the opening is formed so as to cover the opening and to be electrically conductive to the insulating panel.

[0013] In the present invention, the insulating panel forming the chamber body and the insulating panel forming the door body are connected to each other so as to be electrically conductive. Therefore, the insulating chamber as a whole is electrically conductive, and an electromagnetic shielding effect is obtained. Moreover, a shielding box is attached to the insulating panel having an opening through which the shaft of the blower is inserted, so as to cover the opening and to be electrically conductive with the insulating panel. Therefore, not only can the shaft of the blower be positioned to pass through the insulating panel, but also it is possible to prevent electromagnetic waves from leaking out through the opening or from entering the insulating chamber. Therefore, it is possible to improve the electromagnetic shielding effect in the environmental testing device.

[0014] The environmental test device according to the present invention includes a test chamber, an insulated chamber formed using an electrically conductive insulating panel, an air conditioner including an evaporator that evaporates a refrigerant by heat exchange between a refrigerant and air, and a blower that generates an air flow that causes the air conditioned by the air conditioner to flow into the test chamber. The insulated chamber has a chamber body having an entrance and a door body that opens and closes the entrance. The insulating panel that forms the chamber body has an outer panel and an inner panel arranged inside the outer panel. The insulating panel that forms the chamber body and the insulating panel that forms the door body are electrically connected to each other. An opening is formed in the insulating panel that forms the chamber body to pull out a pipe connected to the evaporator from inside the insulating chamber. A shielding box is attached to the insulating panel in which the opening is formed so as to be electrically conductive to the insulating panel and to cover the opening and at least a part of the pipe.

[0015] In the present invention, the insulation panel forming the chamber body and the insulation panel forming the door body are connected to each other so as to be electrically conductive. Therefore, the insulation chamber as a whole is electrically conductive, and an electromagnetic shielding effect is obtained. Moreover, a shielding box is attached to the insulation panel having an opening through which a pipe connected to an evaporator passes, so as to cover the opening and to be electrically conductive with the insulation panel. Therefore, not only can the pipe connected to the evaporator be arranged to pass through the insulation panel, but also it is possible to prevent electromagnetic waves from leaking out through the opening or from entering the insulation chamber. Therefore, it is possible to improve the electromagnetic shielding effect in the environmental testing device.

[0016] A radio wave absorber may be disposed in a space partitioned by the shielding box and the heat insulating panel having the opening.

[0017] In this embodiment, the radio waves that are repeatedly reflected between the shielding box and the heat insulating panel are absorbed by the radio wave absorber, thereby attenuating the radio waves within the space defined by the shielding box and the heat insulating panel.

[0018] The insulation panel forming the chamber body may have an opening through which at least one of a water supply pipe and a drainage pipe passes. In this case, a shielding box may be attached to the insulation panel having the opening so as to cover the opening and to be electrically conductive with the insulation panel.

[0019] In this embodiment, not only is it possible to arrange at least one of the water supply pipe and the drainage pipe to pass through the insulation panel, but it is also possible to prevent electromagnetic waves from leaking out through the opening or from entering the insulation room.

[0020] The chamber body may include a conductive connection part that electrically connects the insulation panel forming the chamber body and the insulation panel forming the door body to each other, the conductive connection part including a conductive frame member arranged to contact the insulation panel forming the chamber body, and a conductive contact member arranged to contact the insulation panel forming the door body and to contact the frame member at a position where the door body closes the entrance. In this case, the frame member may have a shielding gasket, a frame-shaped main body part that presses the shielding gasket against the insulation panel forming the chamber body, and a connection part that is fixed to the main body part and can be contacted by the contact member.

[0021] In this embodiment, the frame-shaped main body of the frame member presses the shield gasket against the insulating panel that forms the chamber body. This ensures electrical conduction between the frame member and the insulating panel of the chamber body. The contact member that contacts the insulating panel of the door body contacts the connection portion of the frame member. Therefore, the frame member is electrically conductive to the insulating panel that forms the door body via the contact member.

[0022] The conductive connection portion may form an adjacent space adjacent to the gap between the chamber body and the door body in a state where the contact member is in contact with the connection portion in the test chamber. In this case, the adjacent space may be isolated from a main space that is a space other than the adjacent space in the test chamber.

[0023] In this embodiment, the adjacent space adjacent to the gap between the chamber body and the door body is isolated from the main space other than the adjacent space in the test chamber, so that heat transfer from the main space to the gap between the chamber body and the door body is suppressed. Therefore, the conductive connection part not only ensures electrical conduction between the chamber body and the door body, but also contributes to suppressing heat transfer from the main space to the gap between the chamber body and the door body. Effect of the Invention

[0024] As described above, according to the present invention, it is possible to improve the electromagnetic shielding effect in an environmental testing device. [Brief description of the drawings]

[0025] [Figure 1] FIG. 1 is a diagram illustrating an environmental testing device according to a first embodiment. [Diagram 2] 4 is an enlarged view showing the vicinity of a hinge of a chamber body and a door body in a heat-insulating chamber of the environmental testing device. FIG. [Diagram 3] 4 is a perspective view of a frame member that constitutes a conductive connection portion provided in the heat-insulating chamber. FIG. [Figure 4] FIG. 13(a) is a diagram showing a conductive connection part according to a modified example, showing a state before the holding part is displaced, and FIG. 13(b) shows a state after the holding part has been displaced. [Diagram 5] 13A and 13B are diagrams showing further modified examples of the conductive connection portion. [Figure 6] FIG. 13 is a diagram illustrating an environmental testing device according to a second embodiment. [Figure 7] FIG. 2A is a perspective view of a shielding box on the motor side provided in the environmental testing device, and FIG. 2B is a perspective view of a radio wave absorber disposed in the shielding box. [Figure 8]FIG. 2A is a perspective view of a shielding box on the bottom side provided in the environmental testing device, and FIG. 2B is a perspective view of a radio wave absorber disposed in the shielding box. [Figure 9] FIG. 13 is a diagram illustrating an environmental testing device according to a third embodiment. [Figure 10] FIG. 2A is a perspective view of a shielding box on the rear side provided in the environmental testing device, and FIG. 2B is a perspective view of a radio wave absorber disposed in the shielding box. [Figure 11] FIG. 13 is a diagram illustrating an environmental testing device according to another embodiment. [Figure 12] FIG. 2 is a schematic diagram showing the environmental testing device as viewed from the front-rear direction. [Figure 13] FIG. 13 is a diagram illustrating an environmental testing device according to another embodiment. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0026] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings.

[0027] (First embodiment) The environmental test apparatus 10 according to the first embodiment includes a heat-insulated room 12 including a test room 12a and an air-conditioning room 12b, and a machine room 16 in which devices connected to an air conditioner 14 for conditioning the test room 12a are arranged. In the environmental test apparatus 10, the temperature and humidity of the air in the test room 12a are controlled to be maintained at set values ​​for a set time. This allows a predetermined thermal load to be applied to a specimen placed in the test room 12a. The environmental test apparatus 10 is not limited to being configured as a thermo-hygrostat chamber in which temperature and humidity are adjusted, and may be configured as a thermostatic chamber in which only temperature is adjusted, for example. The environmental test apparatus 10 may also be configured to be capable of carrying out a thermal shock test.

[0028] In the environmental testing device 10 according to the first embodiment, the heat-insulating chamber 12 is configured to suppress the transmission of electromagnetic waves. Therefore, even if the specimen generates electromagnetic waves, the electromagnetic waves are suppressed from leaking outside the heat-insulating chamber 12. Alternatively, the influence of external electromagnetic waves on the specimen in the heat-insulating chamber 12 is suppressed.

[0029] The heat-insulating chamber 12 has a chamber body 20 having an entrance 20a, and a door body 21 for opening and closing the entrance 20a. The entrance 20a may be large enough for a person to enter and exit, or may be smaller and be large enough to be used for taking in and out a test specimen. The entrance 20a is formed at the front end of the chamber body 20. Note that the "front end" here means the end on the entrance 20a side, and when the entrance 20a is formed on the front, it is the end on the front side, and when the entrance 20a is formed on the side, it is the end on the side side.

[0030] The chamber body 20 has a bottom surface portion 20b, a top surface portion 20c disposed above the bottom surface portion 20b, and a side wall portion 20d that closes three sides except the entrance / exit 20a, and is formed in a hexahedral shape with the entrance / exit 20a open. The entrance / exit 20a is located, for example, at the front of the heat-insulated chamber 12, and the side wall portion 20d forms the left side, rear side, and right side of the heat-insulated chamber 12. Note that the entrance / exit 20a is not limited to being located at the front, and may be located on a side surface.

[0031] The chamber body 20 is formed using insulating panels 23 made of an electrically conductive material, and the door body 21 is also formed using insulating panels 23 made of an electrically conductive material. The insulating panels 23 of the chamber body 20 include an insulating panel 23 constituting the bottom surface 20b, an insulating panel 23 constituting the top surface 20c, an insulating panel 23 constituting the rear side wall 20d, an insulating panel 23 constituting the left side wall 20d, and an insulating panel 23 constituting the right side wall 20d.

[0032] As shown in FIG. 2, the heat insulating panel 23 includes an outer panel 23a, an inner panel 23b disposed inside the outer panel 23a and facing the heat insulating chamber 12, and a heat insulating material 23c disposed between the outer panel 23a and the inner panel 23b. Both the outer panel 23a and the inner panel 23b are made of electrically conductive metal plates, and the outer panel 23a and the inner panel 23b are grounded. The heat insulating material 23c is made of glass wool or a foamed material of urethane resin. The outer panel 23a and the inner panel 23b are made of conductive metal plates to form a Faraday cage, but if at least one of the outer panel 23a and the inner panel 23b is made of a conductive metal plate, it is possible to form a Faraday cage. The outer panel 23a and the inner panel 23b do not need to be grounded.

[0033] Between the outer panel 23a and the inner panel 23b, in addition to the heat insulating material 23c, a radio wave absorber 24 is disposed. The radio wave absorber 24 is, for example, a mixture of urethane resin foam material and carbon powder, and is configured to absorb radio waves by dielectric loss (dielectric radio wave absorber). That is, the radio wave absorber 24 has conductivity. Note that the heat insulating material 23c does not function as the radio wave absorber 24. Since the radio wave absorber 24 is disposed in the space between the outer panel 23a and the inner panel 23b, it is not affected by the humidity of the air in the test room 12a. Therefore, even if a high humidity test is performed, the radio wave absorber 24 is unlikely to deteriorate.

[0034] The radio wave absorber 24 is not limited to a dielectric radio wave absorber, but may be, for example, a conductive radio wave absorber made of conductive fibers and absorbing radio waves due to the resistance inside the material, or a magnetic radio wave absorber that absorbs radio waves due to magnetic loss in a ferrite core or the like.

[0035] The radio wave absorber 24 is formed in a flat plate shape and is disposed along the inner panel 23b. That is, the radio wave absorber 24 is disposed closer to the inner panel 23b than the heat insulating material 23c. Therefore, when the test piece is configured to emit radio waves, the radio waves can be absorbed at a closer position. However, the radio wave absorber 24 is not limited to being disposed along the inner panel 23b, and may be disposed along the outer panel 23a instead, or may be disposed at a position sandwiched between the heat insulating materials 23c.

[0036] The radio wave absorber 24 is provided on the heat insulating panel 23 constituting the top surface 20c of the heat insulating chamber 12, the heat insulating panel 23 constituting the bottom surface 20b, the heat insulating panel 23 constituting the side wall 20d, and the heat insulating panel 23 constituting the door body 21. That is, the radio wave absorber 24 is provided on each surface of the hexahedral heat insulating chamber 12. The radio wave absorber 24 is provided over the entire top surface 20c, but it does not have to be provided over the entire top surface 20c, as long as it is provided over at least half of the top surface 20c. If the radio wave absorber 24 is provided over at least half of the top surface 20c, it can absorb radio waves repeatedly reflected between the inner panel 23b and the outer panel 23a and gradually attenuate them. The same is true for the bottom surface 20b, the side wall 20d, and the door body 21. It is sufficient that the radio wave absorber 24 is provided on any one of the top surface 20c, the bottom surface 20b, and the side wall 20d, and it is not necessary to provide the radio wave absorber 24 on all of them. Moreover, in the door body 21, the radio wave absorber 24 may be omitted.

[0037] 1, a partition plate 26 is placed inside the heat-insulating chamber 12, and the space inside the heat-insulating chamber 12 is divided into a test chamber 12a and an air-conditioned chamber 12b by this partition plate 26. The test chamber 12a is a room for placing a test specimen.

[0038] The air-conditioned room 12b is a room for accommodating the air conditioner 14 and the blower 27, and is connected to the test room 12a through a plurality of communication holes 29. The air conditioner 14 arranged in the air-conditioned room 12b includes a humidifier 14a for humidifying the air, a dehumidifier 14b for dehumidifying the air, a cooler 14c for cooling the air, and a heater 14d for heating the air.

[0039] The humidifier 14a is provided on the bottom surface 20b in the air-conditioning room 12b, and is formed in a dish shape so as to store water. A heater (not shown) is provided in the humidifier 14a. The dehumidifier 14b and the cooler 14c are configured by a heat exchanger (evaporator 14e) provided in a refrigerator having a vapor compression type refrigerant circuit. The heater 14d is configured by, for example, an electric heater. When the environmental test device 10 is configured as a constant temperature bath, the humidifier 14a and the dehumidifier 14b are omitted.

[0040] The blower 27 is configured to generate an air current that causes the air conditioned by the air conditioner 14 to flow into the test chamber 12a. That is, the blower 27 is disposed downstream of the air conditioner 14 in the air flow direction, and is configured to blow air toward the test chamber 12a through the communication holes 29. The conditioned air blown out from the blower 27 flows into the test chamber 12a through some of the communication holes 29. The air in the test chamber 12a flows into the air-conditioned chamber 12b through other communication holes 29.

[0041] The machine chamber 16 is formed from the rear side of the insulated chamber 12 to the lower side of the insulated chamber 12. For example, a heat exchanger (condenser 30) of a refrigerator is disposed on the lower side of the insulated chamber 12, and the condenser 30 is connected to an evaporator 14e in the air-conditioning chamber 12b through a refrigerant piping (not shown) so that a refrigerant can flow therethrough.

[0042] As shown in FIG. 2, a resin portion (first resin portion 33) is formed at the front end 20e (the end portion on the door body 21 side) of the chamber body 20, and a resin portion (second resin portion 34) is also formed at the peripheral portion of the door body 21. In addition, a gap 35 is formed between the first resin portion 33 and the second resin portion 34 when the door body 21 is in the closed position. Therefore, heat transfer between the heat insulating panel 23 constituting the chamber body 20 and the heat insulating panel 23 constituting the door body 21 is suppressed. However, since a Faraday cage is formed by the conductive connection portion 38 described later, an electromagnetic shielding effect can be obtained even if the gap 35 is formed between the chamber body 20 and the door body 21. FIG. 2 shows the hinge 36 side that rotatably supports the door body 21, but other portions of the door body 21 have the same configuration over the entire circumference of the door body 21. For example, a gap 35 is also formed between the first resin portion 33 and the second resin portion 34 at the tip side of the door body 21 opposite to the hinge 36.

[0043] The first resin portion 33 is provided with a first gasket 33a extending toward the second resin portion 34 and in contact with the second resin portion 34, and the second resin portion 34 is provided with a second gasket 34a extending toward the first resin portion 33 and in contact with the first resin portion 33. This prevents air in the test chamber 12a from leaking out of the test chamber 12a through the gap 35.

[0044] The environmental testing device 10 includes a conductive connection 38 that electrically connects the insulating panel 23 forming the chamber body 20 and the insulating panel 23 forming the door body 21 to each other when the door body 21 is in a position that closes the entrance / exit 20a (closed position). By providing the conductive connection 38, the insulating chamber 12 with the door body 21 in the closed position can form a Faraday cage, thereby obtaining an electromagnetic wave shielding structure for the insulating chamber 12.

[0045] The conductive connection part 38 is provided at a position where the chamber body 20 and the door body 21 are adjacent to each other in the test chamber 12a. The conductive connection part 38 includes a frame member 39 arranged so as to contact the insulation panel 23 forming the chamber body 20, and a contact member 40 arranged so as to contact the insulation panel 23 forming the door body 21. The frame member 39 is attached to the front end 20e of the chamber body 20 so as to be located within the test chamber 12a. The contact member 40 is attached to the peripheral portion of the door body 21 so as to be located within the test chamber 12a.

[0046] Both the frame member 39 and the contact member 40 are conductive, and the contact member 40 comes into contact with the frame member 39 when the door body 21 is in a position where it closes the entrance 20a (closed position). Therefore, when the door body 21 is in the closed position, a closed conductor circuit is formed by the room main body 20, the door body 21, and the conductive connection part 38.

[0047] As also shown in Figure 3, the frame member 39 has a shield gasket 39a, a frame-shaped main body portion 39b that presses the shield gasket 39a against the insulation panel 23 that forms the chamber body 20, and a connection portion 39c that is fixed to the main body portion 39b and can come into contact with the contact member 40.

[0048] The shield gasket 39a is made of a flexible and conductive metal member (metal mesh) and is disposed so as to extend along the periphery of the entrance / exit 20a. The shield gasket 39a is pressed by the main body 39b against the inner panel 23b of the insulation panel 23 forming the chamber body 20, thereby ensuring conductivity between the main body 39b and the insulation panel 23 forming the chamber body 20. The shield gasket 39a may not be made of a metal member but may be a conductive rubber-based packing (for example, a configuration in which conductive particles are dispersed in silicone rubber).

[0049] The main body 39b includes a fixing portion 39f fixed to the heat insulating panel 23, and a holding portion 39e that holds the shield gasket 39a while being held by the fixing portion 39f. The holding portion 39e is formed in a frame shape by bending a metal plate into a hollow shape and combining four members extending in one direction. The main body 39b is disposed so as to extend along the periphery of the entrance 20a. The fixing portion 39f is provided on the outer periphery of the holding portion 39e and is fixed to the inner panel 23b of the heat insulating panel 23 that constitutes the door body 21. The shield gasket 39a is sandwiched between the main body 39b and the inner panel 23b with the fixing portion 39f fixed to the inner panel 23b. When the fixing portion 39f is fixed to the inner panel 23b, a fastening method using screws, fixing by welding, or other fixing methods can be used. When the fixing portion 39f is fastened to the heat insulating panel 23, the shield gasket 39a held by the holding portion 39e is pressed against the inner panel 23b.

[0050] The connecting portion 39c is a portion that protrudes from the main body portion 39b toward the door body 21, and has a shield finger 39d attached thereto. The shield finger 39d is configured so that a contact member 40 on the door body 21 side fits into the shield finger 39d when the door body 21 moves to the closed position.

[0051] The contact member 40 is disposed in a frame shape along the peripheral edge of the door body 21 and is fixed to the door body 21 so as to come into contact with the inner panel 23b of the heat insulating panel 23.

[0052] When the contact member 40 is in contact with the connection portion 39c of the frame member 39, the space in the test chamber 12a is divided into a main space S1 and an adjacent space S2. The adjacent space S2 is a space adjacent to the gap 35 between the chamber body 20 and the door body 21, and the main space S1 is a space located on the opposite side of the adjacent space S2 with respect to the conductive connection portion 38. That is, when the contact member 40 is in contact with the connection portion 39c, the conductive connection portion 38 forms an adjacent space S2 in the test chamber 12a, which is a space adjacent to the gap 35 between the chamber body 20 and the door body 21. This adjacent space S2 is isolated from the main space S1. Therefore, an air layer is formed between the gap 35 between the chamber body 20 and the door body 21 and the conductive connection portion 38, and heat transfer from the main space S1 to the gap 35 can be suppressed.

[0053] As described above, in this embodiment, the conductive connection portion 38 is provided to electrically connect the insulating panel 23 forming the chamber body 20 and the insulating panel 23 forming the door body 21 to each other. Therefore, the insulating chamber 12 as a whole becomes conductive, and an electromagnetic shielding effect is obtained. Moreover, since the radio wave absorber 24 is disposed between the outer panel 23a and the inner panel 23b of the insulating panel 23, radio waves repeatedly reflected between the outer panel 23a and the inner panel 23b are absorbed by the radio wave absorber 24. Therefore, radio waves can be attenuated in the insulating panel 23. Therefore, the electromagnetic shielding effect can be improved in the environmental test device 10. Moreover, since the radio wave absorber 24 is disposed between the outer panel 23a and the inner panel 23b, it is not affected by the state of the air (temperature, humidity) in the test chamber 12a. Therefore, even if a high temperature test or a high humidity test is performed, deterioration of the radio wave absorber 24 can be suppressed.

[0054] In this embodiment, the frame-shaped main body portion 39b of the frame member 39 of the conductive connection portion 38 presses the shield gasket 39a against the insulation panel 23 that forms the chamber body 20. This ensures electrical conduction between the frame member 39 and the insulation panel 23 of the chamber body 20. A contact member 40 that contacts the insulation panel 23 of the door body 21 contacts the connection portion 39c of the frame member 39. Therefore, the frame member 39 is in a state in which it can be electrically connected to the insulation panel 23 that forms the door body 21 via the contact member 40.

[0055] Furthermore, since the adjacent space S2 adjacent to the gap 35 between the chamber body 20 and the door body 21 is isolated from the main space S1 other than the adjacent space S2 in the test chamber 12a by the conductive connection part 38, heat transfer from the gap 35 between the chamber body 20 and the door body 21 to the main space S1 is suppressed. Therefore, the conductive connection part 38 not only ensures electrical conduction between the chamber body 20 and the door body 21, but also contributes to suppressing heat transfer from the main space S1 to the gap 35 between the chamber body 20 and the door body 21.

[0056] Furthermore, the radio wave absorber 24 is disposed inside the heat insulating panel 23, and the conductive connection part 38 that electrically connects the heat insulating panel 23 constituting the chamber main body 20 and the heat insulating panel 23 constituting the door body 21 is disposed inside the test chamber 12a. Therefore, it is possible to obtain an electromagnetic shielding effect by simply adding the radio wave absorber 24 and the conductive connection part 38, without having to perform major processing on a conventional environmental test device.

[0057] The configuration of the frame member 39 of the conductive connection portion 38 is not limited to the configuration shown in FIG. 2. The holding portion 39e of the frame member 39 may be displaced relative to the fixing portion 39f to press the shield gasket 39a. Specifically, as shown in FIGS. 4(a) and 4(b), the fixing portion 39f of the frame member 39 integrally includes an outer end portion 39f1 disposed along the inner surface of the inner panel 23b, an extension portion 39f2 extending from the outer end portion 39f1 in a direction away from the inner panel 23b, and an inner end portion 39f3 extending from the inner end of the extension portion 39f2. The inner end portion 39f3 protrudes from the extension portion 39f2 in a direction intersecting with the extension portion 39f2. On the other hand, the holding portion 39e integrally includes an inner end 39e1 located inside (away from the inner panel 23b) of the inner end 39f3 of the fixing portion 39f, an extension portion 39e2 extending from the inner end 39e1 toward the inner panel 23b, and a pressing portion 39e3 extending from the outer end of the extension portion 39e2 in a direction along the inner panel 23b. The inner end 39e1 of the holding portion 39e is formed with an insertion hole through which a screw 41, which is a fastening member fastened to the inner end 39f3 of the fixing portion 39f, is inserted. The screw 41 connects the holding portion 39e to the fixing portion 39f. Note that a clamp or the like may be used as the fastening member instead of the screw 41.

[0058] The aforementioned connecting portion 39c is fixed to the holding portion 39e. A pressing portion 39g that presses the shield gasket 39a held by the holding portion 39e from the side is integrally provided to the connecting portion 39c. An insertion hole is formed in the pressing portion 39g to insert a screw 42 that is fastened to the extension portion 39e2 of the holding portion 39e. The pressing portion 39g is fixed to the holding portion 39e of the main body portion 39b via the screw 42, so that the connecting portion 39c is also fixed to the holding portion 39e. In other words, the connecting portion 39c is fixed to the main body portion 39b via the pressing portion 39g.

[0059] In addition, while FIG. 4(b) shows an example in which the pressing portion 39g is formed integrally with the connecting portion 39c, alternatively, as shown in FIG. 5, the pressing portion 39g may be formed separately from the connecting portion 39c. In this case, the pressing portion 39g can be displaced with respect to the holding portion 39e by fastening a screw 42, which is a fastening member. In addition, a clamp or the like may be used as the fastening member instead of the screw 42. Meanwhile, the connecting portion 39c is fixed to the holding portion 39e by a screw (not shown) or by another method. It is also possible to omit the pressing portion 39g.

[0060] In the state shown in FIG. 4(a), the inner end 39e1 of the holding portion 39e and the inner end 39f3 of the fixing portion 39f are separated from each other, and in this state, the pressing portion 39e3 of the holding portion 39e does not press the shield gasket 39a yet. In other words, the shield gasket 39a is not yet completely fixed, and is only temporarily fixed so that it does not fall off the holding portion 39e. Then, when the screw 41 is tightened from this state, the holding portion 39e is displaced in a direction in which the inner end 39e1 of the holding portion 39e approaches the inner end 39f3 of the fixing portion 39f, as shown in FIG. 4(b). Accordingly, the pressing portion 39e3 of the holding portion 39e approaches the inner panel 23b, and the shield gasket 39a is pressed against the inner panel 23b by the holding portion 39e and deformed. Furthermore, when the screw 42 is tightened, the pressing portion 39g presses laterally the shield gasket 39a that has been pressed by the pressing portion 39e3 of the holding portion 39e and protrudes from the holding portion 39e. In this way, the shield gasket 39a is pressed in two stages, so that the adhesion to the insulation panel 23 can be strengthened.

[0061] If the chamber body 20 and the door body 21 can be electrically connected directly to each other, the conductive connection portion 38 can be omitted.

[0062] Second embodiment 6 shows a second embodiment of the present invention. Note that the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

[0063] In the second embodiment, an opening through which the shaft 27b of the blower 27 is inserted is formed in the heat insulating panel 23 that forms the chamber main body 20, and shielding boxes 47, 52 are provided so as to cover this opening.

[0064] Specifically, blower 27 is configured by a cross-flow fan, and has impeller 27a and shaft 27b supporting impeller 27a. Shaft 27b extends from both ends of impeller 27a. Note that air conditioner 14 (other than humidifier 14a) arranged in air-conditioned room 12b is not shown in FIG. 6.

[0065] One end of the shaft 27b is inserted into an opening (motor-side opening 20f) formed in a side wall portion 20d constituting the left side surface (or right side surface) of the chamber body 20. A motor 44 for driving the blower 27 is attached to one end of the shaft 27b. The motor-side opening 20f penetrates the insulation panel 23.

[0066] The other end of the shaft 27b is inserted into an opening (bearing side opening 20g) formed in a side wall portion 20d constituting the right side surface (or left side surface) of the chamber body 20. A bearing 45 that rotatably supports the shaft 27b is provided at the other end of the shaft 27b. The bearing side opening 20g penetrates the insulation panel 23.

[0067] The motor-side opening 20f is covered by a shielding box 47. As shown in FIG. 7(a), the shielding box 47 has a bottom surface portion 47a and a peripheral surface portion 47b extending along the periphery of the bottom surface portion 47a, and is open in one direction. The shielding box 47 is attached to the insulation panel 23 in which the motor-side opening 20f is formed, so that the open side faces the motor-side opening 20f (insulation panel 23). In other words, the shielding box 47 is disposed so that the bottom surface portion 47a faces the insulation panel 23.

[0068] The shielding box 47 is made of a conductive material such as metal, and is electrically conductive to the outer panel 23a of the heat insulating panel 23. Therefore, even if a motor-side opening 20f is formed in the heat insulating panel 23, electromagnetic waves are prevented from leaking out through this motor-side opening 20f and from entering the heat insulating chamber 12. Moreover, it is sufficient to simply attach the shielding box 47 to the heat insulating panel 23.

[0069] A radio wave absorber 48 is disposed inside the shielding box 47. The radio wave absorber 48 is flat as shown in Fig. 7(b) and disposed along the bottom surface 47a of the shielding box 47. The radio wave absorber 48 absorbs and attenuates radio waves that are repeatedly reflected between the outer panel 23a of the heat insulation panel 23 and the bottom surface 47a of the shielding box 47.

[0070] A cooling opening 47c is formed in the shielding box 47. This opening 47c is extremely small and is not so large as to reduce the shielding effect.

[0071] The shielding box 47 that covers the motor-side opening 20f and the motor 44 is housed in a control box 50 arranged on the side of the heat-insulating chamber 12, as shown in Fig. 6. Therefore, this shielding box 47 cannot be recognized from the outside. The control box 50 has an operation unit (not shown) on the front and houses control devices (not shown).

[0072] The bearing side opening 20g is covered by a shielding box 52. This shielding box 52 is formed in the same shape as the shielding box 47 that covers the motor side opening 20f. The shielding box 52 is attached to the insulation panel 23 in which the bearing side opening 20g is formed, so that the open side faces the bearing side opening 20g (insulation panel 23). Note that the shielding box 52 may also be formed with a cooling opening (not shown) like the shielding box 47.

[0073] A radio wave absorber 53 is disposed inside the shielding box 52 that covers the bearing side opening 20g. This radio wave absorber 53 has a similar configuration to the radio wave absorber 48 disposed inside the shielding box 47 on the motor 44 side.

[0074] A water supply pipe 55 is connected to the humidifier 14a, and this water supply pipe 55 is inserted into an opening (bottom opening 20h) formed in the heat insulating panel 23 that forms the bottom portion 20b of the room main body 20. The bottom opening 20h penetrates the heat insulating panel 23.

[0075] The bottom opening 20h is covered by a shielding box 56. As shown in FIG. 8(a), the shielding box 56 has a bottom portion 56a and a peripheral portion 56b connected to the periphery of the bottom portion 56a, and is open on one side. The shielding box 56 is attached to the insulation panel 23 in which the bottom opening 20h is formed, so that the open side faces the bottom portion 20b of the insulation chamber 12. In other words, the shielding box 56 is disposed so that the bottom portion 56a faces the insulation panel 23.

[0076] The peripheral surface portion 56b is provided with a notch 56c for passing the water supply pipe 55. A drain pipe (not shown) may be connected to the humidifier 14a together with the water supply pipe 55 or instead of the water supply pipe 55, and the shielding box 56 may cover the drain pipe.

[0077] A radio wave absorber 57 is disposed inside the shielding box 56. The radio wave absorber 57 is flat-plate shaped as shown in Fig. 8(b) and is disposed along a bottom surface 56a of the shielding box 56. The radio wave absorber 57 absorbs and attenuates radio waves that are repeatedly reflected between the outer panel 23a of the heat insulation panel 23 and the bottom surface 56a of the shielding box 56.

[0078] In this embodiment, a conductive connection portion 38 is provided to electrically connect the insulating panel 23 forming the chamber body 20 and the insulating panel 23 forming the door body 21 to each other. Therefore, the insulating chamber 12 as a whole is conductive, and an electromagnetic shielding effect is obtained. Moreover, the insulating panel 23 having the openings 20f, 20g through which the shaft 27b of the blower 27 is inserted is provided with the shield boxes 47, 52 attached to the insulating panel 23 so as to cover the openings 20f, 20g and to be electrically conductive with the insulating panel 23. Therefore, not only can the shaft 27b of the blower 27 be disposed to penetrate the insulating panel 23, but also it is possible to prevent electromagnetic waves from leaking out through the openings 20f, 20g or from entering the insulating chamber 12. Therefore, it is possible to improve the electromagnetic shielding effect in the environmental testing device 10.

[0079] Moreover, since the radio wave absorbers 48, 53 are disposed in the space defined by the shielding boxes 47, 52 and the outer panel 23a, radio waves repeatedly reflected between the shielding boxes 47, 52 and the outer panel 23a are absorbed by the radio wave absorbers 48, 53. Therefore, radio waves can be attenuated within the space defined by the shielding boxes 47, 52 and the outer panel 23a.

[0080] In addition, by forming a bottom opening 20h in the insulating panel 23 constituting the bottom portion 20b of the insulating chamber 12, it is possible to arrange the water supply pipe 55 (or the drainage pipe) so as to pass through the insulating panel 23, and the bottom opening 20h is covered by the shielding box 56. Therefore, it is possible to suppress the electromagnetic waves from leaking out through the bottom opening 20h or from entering the insulating chamber 12.

[0081] It should be noted that the description of the other configurations, operations and effects will be omitted, but the description of the first embodiment can be applied to the second embodiment.

[0082] Third embodiment 9 shows a third embodiment of the present invention. Note that the same components as those in the first embodiment are given the same reference numerals, and detailed description thereof will be omitted.

[0083] In the third embodiment, an opening (piping opening 20i) is formed in the insulation panel 23 forming the side wall portion 20d on the rear side, through which the refrigerant piping 60 connected to the evaporator 14e is drawn out from inside the insulation chamber 12. The refrigerant piping 60 extends downward through the rear side portion of the insulation chamber 12 in the machine chamber 16, and also extends to the condenser 30 arranged below the insulation chamber 12.

[0084] A shielding box 62 is attached to the insulation panel 23 in which the piping opening 20i is formed. The shielding box 62 is electrically conductive with the outer panel 23a of the insulation panel 23, and covers the piping opening 20i and a part of the refrigerant piping 60. Even if the piping opening 20i is formed in the insulation panel 23, the shielding box 62 prevents electromagnetic waves from leaking out through the piping opening 20i and from entering the insulation chamber 12. Moreover, it is sufficient to simply attach the shielding box 62 to the insulation panel 23. Note that the shielding box 62 is disposed in the machine chamber 16 and cannot be recognized from the outside.

[0085] 10(a), the shielding box 62 has a bottom surface portion 62a and a peripheral surface portion 62b extending along the periphery of the bottom surface portion 62a, and is open in one direction. The shielding box 62 is attached to the insulation panel 23 in which the piping opening 20i is formed, so that the open side faces the insulation chamber 12. In other words, the shielding box 62 is disposed so that the bottom surface portion 62a faces the insulation panel 23. The peripheral surface portion 62b is provided with a notch 62c for passing the refrigerant piping 60 therethrough.

[0086] A radio wave absorber 63 is disposed inside the shielding box 62. The radio wave absorber 63 is flat as shown in Fig. 10(b) and disposed along the bottom surface 62a of the shielding box 62. The radio wave absorber 63 absorbs and attenuates radio waves that are repeatedly reflected between the outer panel 23a of the heat insulation panel 23 and the bottom surface 62a of the shielding box 62.

[0087] A storage section 65 for storing water overflowing from the humidifier 14a and condensation water generated in the air-conditioning chamber 12b is formed in the bottom surface section 20b of the heat-insulating chamber 12, and a discharge pipe 66 for discharging the condensation water to the outside is connected to this storage section 65. This discharge pipe 66 is connected to a drainage pipe connected to the humidifier 14a, or is drawn out to the outside of the shielding box 56 together with the drainage pipe through a notch 56c (FIG. 8(a)) of the shielding box 56. An opening (discharge pipe opening) 20j for drawing out the discharge pipe 66 from the storage section 65 is formed in the bottom surface section 20b.

[0088] In this embodiment, a conductive connection portion 38 is provided to electrically connect the insulating panel 23 forming the chamber body 20 and the insulating panel 23 forming the door body 21 to each other. Therefore, the insulating chamber 12 as a whole is conductive, and an electromagnetic shielding effect is obtained. Moreover, a shielding box 62 is attached to the insulating panel 23, in which a piping opening 20i is formed to pass the refrigerant piping 60 connected to the evaporator 14e, so as to cover the piping opening 20i and to be electrically conductive with the insulating panel 23. Therefore, not only can the refrigerant piping 60 connected to the evaporator 14e be arranged to pass through the insulating panel 23, but also it is possible to suppress electromagnetic waves from leaking out through the piping opening 20i or from entering the insulating chamber 12. Therefore, the electromagnetic shielding effect can be improved in the environmental testing device 10.

[0089] It should be noted that the explanation of the other configurations, operations and effects will be omitted, but the explanations of the first and second embodiments can be applied to the third embodiment.

[0090] (Other embodiments) It should be noted that the embodiments disclosed herein are illustrative and not restrictive in all respects. The present invention is not limited to the above-described embodiments, and various modifications and improvements are possible without departing from the spirit of the present invention. For example, in the above-described embodiments, the blower 27 is configured as a cross-flow fan, and the shaft 27b of the blower 27 penetrates the side wall portion 20d of the heat-insulated chamber 12. In contrast, in the embodiment shown in FIG. 11, the shaft 27b of the blower 27 penetrates the top surface portion 20c of the heat-insulated chamber 12, and the motor 44 is disposed above the top surface portion 20c. The blower 27 is configured as, for example, a sirocco fan. In this case, two blowers 27 may be provided as shown in FIG. 12.

[0091] The shielding box 47 is attached to the heat insulating panel 23 so as to cover an opening provided in the heat insulating panel 23 forming the top surface portion 20c. In this case, the shielding box 47 can be recognized from the outside. As shown in Fig. 12, the shielding box 47 is disposed so as to cover the two motors 44. Even in this case, it is preferable that a radio wave absorber 48 is provided inside the shielding box 47. Note that in the embodiment of Fig. 12, a cooling opening (not shown) may be formed in the shielding box 47.

[0092] As shown in Fig. 13, shaft 27b of blower 27 may pass through side wall 20d on the rear side of heat-insulated chamber 12, and motor 44 may be disposed on the rear side of side wall 20d. Blower 27 may be formed of, for example, a sirocco fan. In this case, shielding box 47 is housed in machine chamber 16 and cannot be recognized from the outside. Even in this case, it is preferable that radio wave absorber 48 is provided in shielding box 47. In the embodiment of Fig. 13, shielding box 47 may be formed with an opening for cooling (not shown).

[0093] In the second and third embodiments, the radio wave absorber 24 arranged in the heat insulating panel 23 may be omitted. Also, the radio wave absorbers 48, 53, 57, 63 in the shielding boxes 47, 52, 56, 62 may be omitted. Also, in the second and third embodiments, the radio wave absorbers 48, 53, 57, 63 in the shielding boxes 47, 52, 56, 62 are provided on the entire surfaces of the bottom surfaces 47a, 56a, 62a facing the heat insulating panel 23, but this is not limited thereto. The radio wave absorbers 48, 53, 57, 63 may be provided on at least a part (e.g., half or more) of the bottom surfaces 47a, 56a, 62a. Also, the radio wave absorbers 48, 53, 57, 63 may not be limited to being provided on the bottom surfaces 47a, 56a, 62a, but may be provided on a portion forming at least one surface forming the shielding boxes 47, 52, 56, 62.

[0094] In the second and third embodiments, when the humidifier 14a and the storage section 65 are not provided, the shield box 56 and the radio wave absorber 57 are omitted.

[0095] In each of the above-described embodiments, the conductive connection part 38 is provided inside the test chamber 12a, but the present invention is not limited to this. If the thermal insulation chamber 12 with the door 21 in the closed position can form a Faraday cage, the conductive connection part 38 may be disposed outside the test chamber 12a.

[0096] In each of the above-described embodiments, the heat insulating panel 23 has the outer panel 23a, the inner panel 23b, and the heat insulating material 23c, and the radio wave absorber 24 is disposed inside the heat insulating panel 23, but the present invention is not limited to this configuration. For example, the heat insulating material 23c may be omitted, and the radio wave absorber 24 disposed between the outer panel 23a and the inner panel 23b may have a heat insulating function. When the heat insulating material 23c is provided, the radio wave absorber 24 may or may not have a heat insulating function. [Explanation of symbols]

[0097] 10: Environmental test equipment 12: Insulated room 12a: Examination room 14:Air conditioner 14e: Evaporator 20: Room body 20a: Entrance / exit 20f: Motor side opening 20g: Bearing side opening 20h: Bottom opening 20i: Piping opening 21: Door body 23: Insulation panel 23a: Outer panel 23b: Inner panel 23c: Insulation 24: Radio wave absorber 27: Blower 27b: Axis 35: Gap 38: Conductive connection part 39: Frame member 39a: Shield gasket 39b: Main body 39c: Connection 40: Contact member 47: Shield box 48: Radio wave absorber 52: Shield box 53: Radio wave absorber 55: Water supply piping 56: Shield box 57: Radio wave absorber 60: Refrigerant piping 62: Shield box 63: Radio wave absorber S1: Main space S2: Adjacent space

Claims

1. an insulating chamber including a test chamber and formed using an electrically conductive insulating panel; Air conditioners and a blower that generates an airflow that causes the air conditioned by the air conditioner to flow into the test chamber; The heat-insulating chamber has a chamber body having an entrance and a door body for opening and closing the entrance, The heat insulating panel forming the chamber body has an outer panel and an inner panel arranged inside the outer panel, a radio wave absorber is disposed in a space in the heat insulating panel between the outer panel and the inner panel; An environmental testing apparatus, wherein the insulating panel forming the chamber body and the insulating panel forming the door body are electrically connected to each other so as to be electrically conductive.

2. The heat insulating panel forming the chamber body has an opening through which the shaft of the blower is inserted, 2. The environmental testing device according to claim 1, wherein a shielding box is attached to the insulating panel having the opening so as to cover the opening and to be electrically conductive with the insulating panel.

3. The heat-insulating panel forming the chamber body has an opening through which a pipe connected to an evaporator included in the air conditioner is drawn out from the heat-insulating chamber, The environmental testing device of claim 1 or 2, wherein a shielding box is attached to the insulating panel in which the opening is formed, so as to cover the opening and at least a portion of the piping and to be electrically conductive with the insulating panel.

4. 4. The environmental testing device according to claim 2, wherein a radio wave absorber is disposed in a space partitioned by said shielding box and said heat insulating panel having said opening.

5. The heat insulating panel forming the chamber body has an opening through which at least one of a water supply pipe and a drainage pipe passes, The environmental testing device according to claim 1 , wherein the insulating panel having the opening is provided with a shielding box attached thereto so as to cover the opening and to be electrically conductive to the insulating panel.

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