JP2005114377A - Shielding structure for environmental testing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an environmental testing device, provided with a shielding function capable of shielding an electromagnetic wave to measure an accurate temperature/humidity. <P>SOLUTION: In this environmental testing device formed integrally with a testing chamber provided with a door for carry in and carry out of a sample, and comprising a testing area for testing the sample, and a blowing area for blowing prescribed temperature or humidity of atmosphere to the testing area by a fan, a machine room connected to the testing chamber and provided with a refrigerator, and a control room for setting and controlling the temperature or the humidity, an inner face for coating the door and an inside of the testing chamber is formed of a metal having electrical conductivity, such as stainless steel, and a metallic shielding packing formed substantially endlessly along an opening of the testing chamber, coming into contact with the opening side inner face of the testing chamber when closing the door, and having electrical conductivity is provided in the interior wall of the testing chamber. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to an environmental tester having an electric field shielding function capable of accurately measuring temperature and humidity by shielding radio waves.

2. Description of the Related Art Conventionally, an environmental test apparatus capable of setting an interior to a desired atmosphere is known for performing an environmental test for measuring operation characteristics of various devices and parts under various environments.
For example, as shown in Patent Document 1, there is an environmental test apparatus that can set an internal test chamber to a desired temperature and humidity.
In addition, it is necessary to conduct environmental tests to measure the operating characteristics of various devices and parts using radio waves in various environments.
Thus, a conventional shield room or shield box is known in which most of the outer wall surface and the inner wall surface are made of a metal plate having electrical conductivity to block radio wave transmission.
However, in shielded rooms and shield boxes, precise temperature and humidity control over a wide range from low to high temperatures is difficult or impossible due to structural difficulties. When conducting a temperature / humidity characteristic test, it was necessary to bring a temperature / humidity environment tester into a large shield room.
In addition, in the temperature and humidity environment tester, in the case of a member that is mounted through the wall surface such as the output shaft of the fan motor mounted outside or the sensors, the gap between the through hole was sealed with silicon packing, It was difficult to sufficiently shield radio waves.
JP 2001-255349 A JP-A-11-134039

The present invention was devised in view of the above circumstances, and its main problem is to add electric field shielding to the structure of the temperature and humidity environment tester itself and to use a large-scale and expensive shield room. It is another object of the present invention to provide an electric field shield temperature and humidity environment tester capable of easily performing a highly accurate temperature and humidity environment test in an electric field shielding environment.
Another problem of the present invention is that it shields radio waves between the door and the test chamber or the mounting portion of the member that is mounted through the wall surface, and at the same time against moisture and water vapor accompanying temperature and humidity operation in the tank. It is an object of the present invention to provide an environmental test apparatus that can maintain the sealing performance and can appropriately perform an environmental test.

In order to achieve the above object, the present invention provides a first aspect of the present invention.
A test chamber having a door for entering and exiting the sample, a test area for testing the sample, and a ventilation area for blowing an atmosphere of a predetermined temperature or humidity with a fan in the test area; and connected to the test room An environmental tester in which a machine room provided with a refrigerator and a control room for setting and controlling the temperature or humidity are integrally formed,
The interior surface that covers the interior of the door and the test chamber is made of an electrically conductive metal such as stainless steel, and is formed on the inner wall of the test chamber door in an almost endless manner along the test chamber opening. Technical measures are taken to provide a metal shield packing that can be in electrical contact with the interior surface on the open side of the test chamber when closed.
Moreover, in invention of Claim 2, it is the said environmental test device, Comprising: The shielding function is,
Supporting the bowl-shaped member that penetrates the heat insulating wall of the test chamber, and forming an attachment member that can make electrical contact with the interior surface of the test chamber,
A technical means is provided in which a sealing means is provided so as not to generate a gap between the constituent members of the mounting member.
Furthermore, in invention of Claim 3, it is the said environmental test device, Comprising: The shielding function is,
The fan shaft that penetrates the heat insulation wall of the test chamber is supported, and an attachment member that can make electrical contact with the interior surface of the test chamber is formed, and a gap that leads to the outside does not occur between the constituent members of the attachment member. Is provided with a sealing means,
A technical means is provided in which the shaft of the fan is divided at an intermediate position, and a joint of an insulating member for connecting the divided shaft is provided.
In the invention of claim 4,
The technical means is that the shaft is composed of a shaft connecting a rotating shaft of a fan provided in a test chamber and an output shaft of a fan motor provided outside.
In the invention of claim 5, the environmental tester is provided with a technical means that the shield function has all the constituent elements of claims 1 to 3.
In the invention of claim 6,
An airtight elastic seal member formed substantially endlessly along the opening of the test chamber on the inner wall of the door, and a test chamber formed when the door is closed by being formed substantially endless outside or inside the elastic seal member The technical means of providing a metal shield packing capable of electrical contact with the interior surface on the opening side is taken.
In the invention of claim 7,
The bowl-shaped member is all or part of a heater for heating, a heater for humidification, a wick pan for humidification, a conduit for a cooling coil, a temperature sensor or a humidity sensor,
The mounting member into which the hook-shaped member is inserted is composed of a support base portion that is fixed to the interior surface and protrudes inward, and a plug portion that is screwed to the support base portion.
The sealing means includes a wedge portion formed at the tip of the plug portion, an inclined surface portion having a tapered cross section formed on the support base portion into which the tip of the plug portion can be inserted, and a plug portion formed at an acute angle from the inclined surface portion. The technical means that it consists of the wedge part formed in the front-end | tip of this is taken.
Furthermore, in the invention of claim 8,
An attachment member into which the fan shaft is inserted is an inner support piece fixed to the interior surface, a bearing cylinder main body that is built in the heat insulating wall and has a tip coupling portion fitted into the inner support piece and protrudes inward. A heat insulating base fixed to the rear of the main body of the bearing cylinder and having a radio wave blocking property; and an outer flange fixed to the heat insulating base and abutted against the exterior surface of the heat insulating wall and fixed to the fan motor. And
The sealing means comprises an inclined surface portion having a tapered cross section formed on the rear end side of the inner support piece, and a curved surface portion formed at a position in contact with the inclined surface portion of the bearing cylinder body, and the tip of the connecting portion A technical means is adopted in which a nut is fastened to a screw formed in the above and a curved surface portion is pressed against the inclined surface portion and sealed.
In the invention of claim 9,
A through hole in the interior surface has a hole that penetrates the center, and a front end flange that is hooked to the opening of the through hole in the interior surface at the tip, and a stainless steel cap receiving part that is built in midway through the heat insulating wall is fitted. Together,
It has a hole that communicates with the hole of the cap receiving part and penetrates the center, and has a rear end flange that engages with the opening of the exterior surface of the through hole at the rear end, and is fitted to the extended end of the cap receiving part. A glass woven cloth epoxy resin cylinder to be fixed together is provided,
A stainless steel cap is screwed onto the cap receiving portion to close the front opening,
A technical means is provided in which an outer cap is detachably fixed to the rear end flange and has a measurement port that closes the rear opening.

  The environmental tester equipped with the electric field shielding function of the present invention shields radio waves without using a shield room or a shield box, and covers a wide range of temperatures and temperatures that were previously impossible for various communication devices and component samples. Characteristic tests and reliability evaluation in a humidity environment are possible.

  In the following, a preferred embodiment of the shield structure of the environmental test of the present invention will be described with reference to the drawings.

The environmental tester 1 shown in FIG. 1 and FIG. 2 as an example includes a test area 4 for testing a sample and an air blowing area 5 for blowing an atmosphere of a predetermined temperature or humidity to the test area 4 with a fan F. A test chamber 3 provided with a door 6 that opens and closes the test area 4 to enter and exit the sample and is covered with a heat insulating wall 7, a machine room 2 provided with an intake / exhaust port and a refrigerator below the test chamber 3, and the test chamber 3 has a control panel on the side and a control chamber 8 for controlling the temperature and humidity.
And in the ventilation area 5, the temperature control sensor 5a and the humidity control sensor 5b, the fan F for circulating air, the heater 5c, the cooling coil 5d connected to the refrigerator, the humidifier heater 5e, and the humid wick pan 5e. Humidifiers such as' can be provided to send a temperature and humidity controlled atmosphere to the test area 4.

The test chamber 3 is surrounded by a heat insulating wall 7. In this embodiment, the inner surface 7 a of the heat insulating wall 7 is made of a stainless steel plate, and the outer surface 7 b is made of a painted steel plate. .
For example, the following through holes are formed in the heat insulating wall 7 of the test chamber 3.
(1) A through-hole for attaching a shaft S that connects the fan F provided in the blowing area 5 and the fan motor M provided outside (back surface) of the test chamber 3.
(2) A bowl-shaped end of the temperature control sensor 5a and the humidity control sensor 5b, a bowl-shaped end of the heater 5c, a conduit 5d ′ of the cooling coil 5d, a bowl-shaped end of the humidifying heater 5e and the humidifying wick pan 5e ′ Small-diameter through-holes that allow parts to pass through.

[Fan motor shaft mounting structure]
A large-diameter through hole H1 is opened in the heat insulating wall 7 provided in the air blowing area 5 of the test chamber 3 shown in FIG.
The through-hole H1 is fitted with a sleeve-like metal pipe 10 that extends to the midway position along the peripheral wall to form an inner peripheral wall surface of the through-hole H1.
A bearing portion 11 for the fan motor M, which serves as an attachment member, is fitted into the through hole H1, shielded by a sealing means, and the shaft is also positioned.
The bearing portion 11 is a bearing that supports a shaft S that connects the inner support piece 12 fixed to the opening portion of the through hole H1 on the interior surface 7a side of the heat insulating wall 7, the fan F (not shown), and the motor M. A cylinder main body 13, a heat insulating base 14 fitted and fixed to the rear of the bearing cylinder main body 13, and an outer flange 15 fixed to the heat insulating base 14 and hooked to an opening on the exterior surface side of the heat insulating wall; It is made up of.
In this embodiment, the shaft S can be positioned so as to be arranged on the same axis as the bearing cylinder main body 13 at the time of mounting, and the gap between the inner diameter and the outer diameter of the shaft S and the bearing cylinder main body 13 is set narrow. The shield effect is further improved by increasing the length of the portion.

The inner support piece 12 has a circular flange 12b at the tip of the cylindrical body 12a.
The inner support piece 12 is hooked to the opening edge of the through hole of the interior surface 7a at a midway position on the back surface of the flange 12b and fixed by welding or the like.
The rear end portion of the cylindrical body 12a is formed in an annular shape with an inclined surface portion 22 that has the same outer diameter and is gradually cut outward in a tapered shape (see FIG. 3B). .

The bearing cylinder body 13 is fitted in the hollow of the inner support piece 12 and has a connecting portion 13a in which a male screw portion 23 that can be screwed into a female screw portion 21 of a nut 16 described later is formed, and is concentric with the connecting portion 13a. It consists of a large-diameter trunk portion 13b and leg portions 13c that have a small diameter from the trunk portion 13b and are fitted and fixed to the heat insulating base 14.
And the connection part of the trunk | drum 13b and the connection part 13a is formed in the curved surface part 24 (refer FIG.3 (b)).
Since it consists of the said structure, the connection part 13a is plunged into the hollow of the inner side support piece 12 fixed to the interior surface from back, and the front-end | tip part which protruded ahead from the inner side support piece 12 is substantially the same as the said collar part 12b. An outer diameter donut disk-shaped nut 16 is screwed and screwed with a female screw portion 21.
When the nut 16 is tightened, the connecting portion 13a is screwed and the curved surface portion 24 is brought into line contact with the inclined surface portion 22 to be tightened, so that the inner support piece 12 and the bearing cylinder main body 13 are sealed without gaps, Will not pass.

Further, the heat insulating base 14 is provided with a step portion 14a having a slightly small diameter at the upper part of the outer peripheral surface thereof, and the rear end of the metal pipe 10 is fitted and locked without any gap.
A guide pin 25 passes through the heat insulating base 14 and can be fitted into a hole 26 a formed in a flange 26 for mounting the motor 27.
A mounting bolt B1 is screwed to the heat insulating wall 7 from the outside via the outer flange 15 to the flange 26 of the motor M, and is guided by the guide pin 25 via the outer flange 15. The heat insulating base 14 and the bearing cylinder main body 13 are fixed at the rear so that they can be centered.

The shaft S of the motor M is fitted into the central hole of the bearing portion 11 attached in this way.
In the present embodiment, the shaft S is divided and connected to the coaxial line by a joint portion 28 made of an electrically insulating material, in the present embodiment, for example, a glass woven epoxy resin (Garaepo).
In this way, a metal shaft such as the shaft S or a large-diameter brazing material is divided, and a resin joint member having no electrical conductivity is interposed and connected coaxially, thereby shielding radio waves. It is possible to further improve the properties.
The structure of the mounting member of the present invention can be applied not only to the shaft of a fan for blowing air but also to other shafts.

[Mounting structure for bowl-shaped members]
Next, the bowl-shaped ends of the temperature control sensor 5a and the humidity control sensor 5b, the bowl-shaped end of the heater 5c, the conduit 5d 'of the cooling coil 5d, the humidifier heater 5e and the humid wick pan 5e' When the end portion or the like is passed through the small-diameter through hole H2, a shield structure using an attachment member and a sealing means as shown in FIG. 4 is adopted.
This shield structure includes a cylindrical support base portion 31 and a plug portion 33 having a hole through which a saddle member is passed in the center.
That is, the base end of the support base 31 that protrudes inward and has a hole in the center is fitted into the through hole H2 that penetrates the heat insulating wall 7 of the test chamber 3 and opens to the interior surface 7a, and is fixed by being hooked. The
The hole formed in the support base 31 has a first hole portion 32a for plug insertion, which is formed to have a slightly larger diameter on the distal end side, and an internal thread is engraved on the inner peripheral surface, and a cross section that gradually decreases in diameter at an intermediate position. It consists of a tapered second inclined hole 32b and a small-diameter third hole 32c through which the brazing material is passed on the base end side.

On the other hand, the plug portion 33 includes a large-diameter base portion 33a formed at the base end, a main body portion 33b having a small diameter and engraved male threads that are fitted into the first hole portion 31a and screwed, and a main body portion 33b. It has the wedge part 34 which becomes a small diameter gradually toward the front-end | tip.
The wedge portion 34 is set to an angle (acute angle) smaller than the inclination angle of the second inclined hole portion 32b.
Since it consists of the said structure, the said brazing material is penetrated through the heat insulation wall 7 through the hole 33 'of the center of the plug part 33, and the hole 32 of the center of the support stand part 31. FIG.
When the plug portion 33 is turned and screwed with the screw, the wedge portion 34 at the tip is inserted into the second inclined hole portion 32b and tightened, so that the space between the support base portion 31 and the plug portion 33 is sealed. In addition, it is possible to seal between the saddle member penetrating the heat insulating material 7 and the wedge portion 34.
Here, the wedge part 34 may be configured integrally with the plug part 33 or separated from the plug part 33.
That is, in the case of a separate body, the stainless steel plug portion may be configured to exclude the wedge portion, and a single wedge portion made of copper may be pressed and tightened by screwing the plug portion.
In this way, even if various types of saddles that penetrate the heat insulating wall 7 are attached, radio waves can be effectively shielded.

[Door shield packing structure]
Next, as shown in FIG. 5, the door 6 provided in the test chamber protrudes slightly from the elastic seal member 36 together with the elastic seal members 36 and 36 'such as silicon rubber, and the door 6 is closed. In addition, a shield packing 37 made of a reticulated nickel copper alloy (monel) that abuts the interior surface of the test chamber is annularly mounted.
In the illustrated example, a shield packing 37 is disposed along the outside of the inner elastic seal member 36.

Here, the material of the shield packing 37 is not limited to monel, and may be any material having electrical conductivity that blocks radio waves such as steel wool, rubber containing conductive material, and leaf spring, and preferably has elasticity.
This shield packing 37 is formed by forming a fibrous monel in a mesh shape and folding it to a uniform height. In the illustrated example, the shield packing 37 is doubled in parallel and mounted inside the door 6. Yes.

As a result, when the door 6 is closed, the shield packing 37 reliably comes into contact with the interior surface 7a made of stainless steel in the test chamber. The elastic seal members 36 and 36 'are in contact with the interior surface 7a.
Thereby, when the door 6 is closed, the atmosphere of the temperature and humidity in the test chamber is sealed by the seal member 36, and between the test chamber and the door is shielded by the shield packing 37 on the outer side, so that the entrance and exit of radio waves can be blocked. .

[Measurement port structure]
Next, FIG. 6 shows an example of the measurement port 40.
The measurement port 40 includes a cap receiving portion 41 into which the inner cap 45 is screwed, a glass body 46 made of glass epoxy built in the heat insulating wall 7, and an outer cap 48 that closes the cylinder 46.
The cap receiving portion 41 is made of stainless steel, and has a front end flange 42 that is fixed to the opening of the through hole H3 of the interior surface 7a at the front end. The cylindrical body 43 is built in to the middle position of the heat insulating wall 7.

On the other hand, the cylindrical body 46 is made of glass epoxy having heat insulating properties and insulating properties, has a hole communicating with the hole of the cap receiving portion 41 and penetrating through the center, and an exterior surface of the through hole H3 at the rear end. The rear end flange 47 is hooked on the opening 7b, and is fixed to the exterior surface 7b side by screws.
And the front-end | tip of this cylinder 46 is fitted to the rear end of the said cap receiving part 41, is coated 49 with a silicon coating agent etc., and is fixed.

Since it consists of the said structure, the inner opening 45 made from stainless steel can be screwed to the said cap receiving part 41, and the front opening can be closed so that opening and closing is possible.
Further, an outer cap 48 made of glass epoxy is detachably screwed to the rear end flange 47 of the cylindrical body 46 so that the rear opening can be opened and closed.
Since the measurement port 40 is formed in this way, a stainless steel inner cap 45 and a cap receiving portion 41 which are connected to the interior surface 7a and have electrical conductivity are provided, and a cylindrical tube made of glass epoxy which has heat insulation and insulation properties. Since the cap receiver 41 is connected within the heat insulating wall 7 by the body 46, the measurement port 40 can be shielded and shielded as much as possible.
A stainless steel inner cap 45 and a cap receiving portion 41, which are connected to the interior surface 7a and have conductivity, are provided, a distance between the thread surfaces of the male screw and the female screw, and a contact surface between the cap receiving portion 41 and the inner cap 45. It is also possible to improve the shielding property between the contact surfaces by sandwiching a fine wire mesh A. Similarly, the structure in which the shielding property between the contact surfaces is improved with the metal mesh A interposed between the contact surfaces of the inner support piece 12 and the nut 16 shown in FIG.

  The present invention is not limited to the above-described embodiment, and it is needless to say that various design changes can be made according to the application.

It is a front view of an environmental tester. It is a reference figure showing a test room typically. It is sectional drawing which shows the attachment member and sealing means of a shaft of a fan. It is sectional drawing which shows the attachment member and sealing means of a bowl-shaped member. It is a figure explaining the shield packing of a door. It is sectional drawing which shows the structure of a measurement port.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Environment tester 2 Machine room 3 Test room 4 Test area 5 Air blowing area 6 Door 8 Control room 7 Heat insulation wall 7a Interior surface 7b Exterior surface 10 Metal pipe 11 Bearing part 12 Inner support piece 13 Bearing cylinder main body 14 Heat insulation base 15 Outer １６ part 16 Nut 21 Female thread part 22 Inclined surface part 23 Male thread part 24 Curved surface part 25 Guide pin 26 Flange 27 Motor 28 Joint part 31 Support base part 32 Hole 33 Plug part 36 Elastic seal member 37 Shield packing 40 Measuring port 41 Cap receiving part 42 Front end flange 43 Receiving cylinder 45 Inner cap 46 Cylindrical body 48 Outer cap 47 Rear end flanges H1, H2, H3 Through hole A Wire mesh F Circulating fan M Fan motor S Shaft

Claims (9)

A test chamber having a door for entering and exiting the sample, a test area for testing the sample, and a ventilation area for blowing an atmosphere of a predetermined temperature or humidity with a fan in the test area; and connected to the test room An environmental tester in which a machine room provided with a refrigerator and a control room for setting and controlling the temperature or humidity are integrally formed,
The interior surface that covers the interior of the door and the test chamber is made of an electrically conductive metal such as stainless steel, and is formed on the inner wall of the test chamber door in an almost endless manner along the test chamber opening. An environmental tester having an electric field shielding function, characterized in that a metal shield packing capable of electrical contact with the interior surface on the opening side of the test chamber when the is closed is provided. A test chamber having a door for entering and exiting the sample, a test area for testing the sample, and a ventilation area for blowing an atmosphere of a predetermined temperature or humidity with a fan in the test area; and connected to the test room An environmental tester in which a machine room provided with a refrigerator and a control room for setting and controlling the temperature or humidity are integrally formed,
Supports a bowl-shaped member that penetrates the heat insulation wall of the test chamber, forms an attachment member that can be in electrical contact with the interior surface of the test chamber, and does not cause a gap between the components of the attachment member to communicate with the outside Is provided with a sealing means,
An environmental tester having an electric field shielding function, characterized in that a sealing means is provided so that a gap communicating with the outside does not occur between constituent members of the mounting member. A test chamber having a door for entering and exiting the sample, a test area for testing the sample, and a ventilation area for blowing an atmosphere of a predetermined temperature or humidity with a fan in the test area; and connected to the test room An environmental tester in which a machine room provided with a refrigerator and a control room for setting and controlling the temperature or humidity are integrally formed,
Supports the shaft that penetrates the heat insulation wall of the test chamber, forms a mounting member that can be in electrical contact with the interior surface of the test chamber, and seals so that there is no gap between the components of the mounting member. Providing means,
An environmental tester having an electric field shielding function, wherein the shaft is divided at an intermediate position, and a joint of an electrically insulating member for connecting the divided shafts is provided.   4. The electric field shielding function according to claim 3, wherein the shaft comprises a shaft that connects a rotating shaft of a fan provided in the test chamber and an output shaft of a fan motor provided outside. Environmental tester. A test chamber having a door for entering and exiting the sample, a test area for testing the sample, and a ventilation area for blowing an atmosphere of a predetermined temperature or humidity with a fan in the test area; and connected to the test room An environmental tester in which a machine room provided with a refrigerator and a control room for setting and controlling the temperature or humidity are integrally formed,
The interior surface that covers the interior of the door and the test chamber is made of an electrically conductive metal such as stainless steel, and is formed on the inner wall of the test chamber door in an almost endless manner along the test chamber opening. Provided with a metal shield packing that can make electrical contact with the interior surface of the test chamber opening when the
Supports the fan shaft or bowl-shaped member that penetrates the heat insulation wall of the test chamber, forms an attachment member that can be in electrical contact with the interior surface of the test chamber, and provides a gap between the component members of the attachment member to the outside Provide sealing means to prevent
An environmental tester having an electric field shielding function, wherein the shaft of the fan is divided at an intermediate position, and a joint of an insulating member for connecting the divided shafts is provided.   An airtight elastic seal member formed substantially endlessly along the opening of the test chamber on the inner wall of the door, and a test chamber formed when the door is closed by being formed substantially endless outside or inside the elastic seal member 5. An environmental tester having an electric field shielding function according to claim 1, wherein a metal shield packing capable of electrical contact with the interior surface on the opening side is provided. The bowl-shaped member is all or part of a heater for heating, a heater for humidification, a wick pan for humidification, a conduit for a cooling coil, a temperature sensor or a humidity sensor,
The mounting member into which the hook-shaped member is inserted is composed of a support base portion that is fixed to the interior surface and protrudes inward, and a plug portion that is screwed to the support base portion.
The sealing means includes a wedge portion formed at the tip of the plug portion, an inclined surface portion having a tapered cross section formed on the support base portion into which the tip of the plug portion can be inserted, and a plug portion formed at an acute angle from the inclined surface portion. The environmental tester having an electric field shielding function according to claim 2, wherein the environmental tester has a wedge portion formed at a tip of the electric field shield. An attachment member into which the fan shaft is inserted is an inner support piece fixed to the interior surface, a bearing cylinder main body that is built in the heat insulating wall and has a tip coupling portion fitted into the inner support piece and protrudes inward. A heat insulating base fixed to the rear of the main body of the bearing cylinder and having a radio wave blocking property; and an outer flange fixed to the heat insulating base and abutted against the exterior surface of the heat insulating wall and fixed to the fan motor. And
The sealing means comprises an inclined surface portion having a tapered cross section formed on the rear end side of the inner support piece, and a curved surface portion formed at a position in contact with the inclined surface portion of the bearing cylinder body, and the tip of the connecting portion 6. The environmental tester having an electric field shielding function according to claim 3, wherein a nut is fastened to a screw formed in the step and a curved surface portion is pressed against the inclined surface portion and sealed. A through hole in the interior surface has a hole that penetrates the center, and a front end flange that is hooked to the opening of the through hole in the interior surface at the tip, and a stainless steel cap receiving part that is built in midway through the heat insulating wall is fitted. Together,
It has a hole that communicates with the hole of the cap receiving part and penetrates the center, and has a rear end flange that engages with the opening of the exterior surface of the through hole at the rear end, and is fitted to the extended end of the cap receiving part. A glass woven cloth epoxy resin cylinder to be fixed together is provided,
Screw the inner cap made of stainless steel to the cap receiving part to close the front opening,
The environmental tester with an electric field shielding function according to claim 1, further comprising a measurement port that detachably fixes an outer cap to the rear end flange and closes a rear opening.

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