JP2002048705A - Internal pressure regulating mechanism for environmental testing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an internal pressure regulating mechanism with excellent internal pressure regulating function capable of disposing dew condensate. SOLUTION: This internal pressure regulating mechanism is composed of an opening 1 opened in a wall 12 comprising a heat insulating wall of a laboratory 11 of a constant temperature tank part 10 of a complex testing machine; a bag 2 provided at the opening 1 so as to be able to shut off air between the inside and outside of the laboratory 11; an inclined plate 3; and an end member 4 for covering the open end face of the wall 12 and fitting the bag 2. Since the bag is expanded/contracted without resistance, internal pressure regulating performance is excellent, and even if the dew condensate is produced inside and outside of the bag, the dew condensate can be positively drained by the inclined plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an internal pressure adjusting mechanism provided in an environmental test apparatus having a test chamber capable of applying at least a temperature environment to a test object. It is conveniently used for adjusting the internal pressure of a vibration environment composite test device that performs a composite test of conditions.

[0002]

2. Description of the Related Art In an environmental test apparatus, the pressure in a test chamber fluctuates due to a change in environmental test conditions including temperature and humidity. In addition, in the vibration environment combined test device, the vibration of the vibration table inserted into the test chamber so as to mount the sample to perform the vibration test and the vibration of the sample moving therewith cause a rapid cycle internal pressure fluctuation, and the vibration is tested. The entire room may be vibrated, causing various adverse effects.
Therefore, an internal pressure adjusting mechanism as shown in FIG. 7 is usually provided to prevent such internal pressure fluctuation.

[0003] Among them, (a) and (b) show a structure in which a bellows 5 having a closed end is provided in a through hole 6 in a ceiling 13 of a test chamber 11 and a similar bellows 5 in a through hole 1 in a wall 12. This shows the structure provided.

[0004] However, in the structure of (a),
When the inside of the test chamber 11 is set to a high temperature and high humidity condition of, for example, a temperature of 85 ° C. and a relative humidity of 85%, there is a problem that the bellows 5 is cooled by the outside air to cause dew condensation inside the bellows 5, and the bellows 5 falls on the test object. In the case of (b), in the same test, condensed water accumulates in the groove of the bellows 5 and cannot be discharged. Therefore, germs may propagate in the water, and the water accumulated during the low-temperature test freezes, and However, there is a problem that the stretching function is reduced. Further, in the bellows type, since the bellows 5 has a fixed shape, the amount of expansion and contraction at the time of pressure fluctuation is limited, and the pressure fluctuation at the time of vibration cannot be eliminated smoothly. There is also a problem that large pressure fluctuations cannot be handled.

(C) and (d) show a structure in which a sealing film 7 having a radial cut 7a is provided in the through hole 1. In the case of this structure as well, during the same high-temperature and high-humidity operation, since the water vapor leaks from the test chamber 11 to the outside through the gap 7a of the sealing film, the water consumption is greatly increased and the power for humidification is increased. Becomes extra. Also, at the time of the low-temperature test, water vapor, which is the humidity of the outside air, enters the test chamber from the gap 7a and freezes in the evaporator of the refrigerator to form frost. There is a problem that the continuity of the low-temperature test is lost.

[0006]

SUMMARY OF THE INVENTION The present invention solves the above-mentioned problems in the prior art, and does not cause problems such as dew condensation on the test object, germs germinating in the dew condensation water, and consumption of water. It is another object of the present invention to provide an internal pressure adjusting mechanism of an environmental test apparatus which has a good internal pressure adjusting function and can cope with a large pressure fluctuation.

[0007]

According to the present invention, in order to solve the above-mentioned problems, the invention according to claim 1 is provided in an environmental test apparatus having a test chamber capable of providing a test object with at least a temperature environment. In the internal pressure adjusting mechanism, a bag-shaped sealing member made of a deformable and flexible material, which is provided in the opening so as to cut off gas conduction between the inside and outside of the testing chamber, and an opening formed in a wall of the testing chamber. And a receiving member projecting from the wall to the opposite side of the test chamber at an upward slope and provided to be able to support the sealing member when the sealing member expands to the opposite side. And

According to a second aspect of the present invention, there is provided an internal pressure adjusting mechanism provided in an environmental test apparatus having a test chamber capable of applying at least a temperature environment to a test object, wherein an opening formed in a wall of the test chamber; An intermediate member formed so that one end side is electrically connected to the opening and the other end side is opened upward and can be drained in the direction of the opening, and is connected to the other end side so as to shut off gas conduction between the inside and outside of the test chamber. And a bag-shaped sealing member made of a flexible material that is attached and deformable and formed to swell upward.

According to a third aspect of the present invention, in addition to the above, an internal support member provided in the seal member so as to hold the seal member at the upper position is provided.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows the structure of a part including an internal pressure adjusting mechanism of a vibration environment combined test apparatus (hereinafter referred to as a "combined test machine") which is an example of an environmental test apparatus to which the present invention is applied.

The internal pressure adjusting mechanism has an opening 1 formed in a wall 12 formed of a heat insulating wall of a test chamber 11 of a thermostatic chamber portion 10 of the multi-functional tester, and can cut off the conduction of air as a gas between the inside and outside of the test chamber 11. In this way, it is composed of a bag 2 as a bag-shaped sealing member provided in the opening 1, an inclined plate 3 as a receiving member, and the like. Reference numeral 4 is an end member for covering the opening end surface of the wall 12 in which the heat insulating material 12a is put and for attaching the bag 2, and the bag 2 is attached to a tip portion thereof by a hose band 2a.

The bag 2 is made of a deformable and flexible material such as polyethylene or silicone. As this material, a material suitable for the intended use is selected in consideration of heat resistance and the like. The inclined plate 3 protrudes from the wall 12 to the opposite side of the test chamber 11 with an upward slope, and is provided so as to be able to support the bag 2 when the bag 2 is inflated to the same opposite side.

The composite testing machine includes a thermostat section 10 and a vibrator section 20. The thermostat section 10 is not shown in detail, but has an air-conditioning chamber partitioned from the test chamber 11 and surrounded by the same heat-insulating wall 12, in which a heater, a humidifier, and a refrigerator are provided. The apparatus is provided with an evaporator to which a refrigerant is supplied, a blower for circulating air between the test chamber and the like. This device can provide an environment up to a low temperature condition of -70 ° C.

Although not shown in detail, the vibrator portion 20 has a built-in electromagnetic coil and the like, and is configured to vibrate the vibration table 22 in the main body 21. Sign 2
Reference numeral 3 denotes an intermediate table mounted on the vibration table 22 for mounting the sample W thereon.

The above internal pressure adjusting mechanism operates as follows. When the composite testing machine is not in use, the bag 2
Usually, as shown in FIG. 2 (a), it slightly protrudes to either the test chamber 11 side or the outside world 30 side (the outside world side in the figure), and is brought into such a state during the test. When a temperature change occurs, the air in the test chamber 11 expands and contracts. Here, since the bag 2 is made of a deformable and flexible material, the bag 2 changes from a contracted state to a swollen state as shown by a solid line in FIG. By further expanding from the state swelled to some extent to the state shown by the solid line, or swelling to the test chamber 11 side as shown in FIG. 3 (c), it is possible to prevent the internal pressure fluctuation from occurring or to keep it in a very small fluctuation range.

When the sample W vibrates, the internal airflow pulsates even if the volume of the air held in the test chamber 11 hardly changes, but the bag 2 expands and contracts without any resistance. It does not lead to fluctuations. As described above, the internal pressure adjusting mechanism of the present invention has very good characteristics.

On the other hand, when the bag 2 swells outward under high-temperature and high-humidity conditions, the internal air is cooled by the outside air and dew water is generated in the bag 2, but the bag 2 is received by the inclined plate 3. Therefore, the condensed water can be discharged into the test chamber 11 along the slope without dripping outward due to the weight of the condensed water.
In this case, since the bag 2 is attached to the side wall 12,
Condensation water falling into the test chamber 11 flows down along the wall,
It does not hang on the sample W.

When the test is shifted from the high-temperature test to the low-temperature test, the air in the test chamber 11 contracts, and the bag 2 is brought into the state shown in FIG. Further, even if water droplets p that have condensed remain as shown in FIG.
It is discharged when the state of (c) is reached. Further, at the time of the low-temperature test, the outside air is cooled and dew condensation water droplets p are generated outside the bag 2, but these also fall on the inclined plate 3 and flow out therefrom.

When the door of the test chamber 11 is opened and closed when the sample W is taken in and out, the internal pressure fluctuates greatly on the negative pressure side or the positive pressure side. When the dew water has accumulated inside and outside, it is completely discharged.

According to the operation of the internal pressure adjusting mechanism as described above, the internal pressure can be adjusted without causing the air in the test chamber 11 to leak out. Therefore, waste of water and electric power is prevented. Furthermore, since outside air does not enter the test chamber 11,
There is no extra frost on the evaporator, which prevents interruption of the test due to defrosting.

FIG. 3 shows another configuration example of the internal pressure adjusting mechanism to which the present invention is applied. The internal pressure adjusting mechanism of this example is different from that of FIG. 1 in that one end 81 is connected to the opening 1 and the other end 82 is upward Z.
And a bag 2 which is a sealing member similar to that shown in FIG. In the direction shown in FIG. Hereinafter, the structure and the operation and effect will be described with respect to such differences, and the description of the same parts as those in FIG. 1 will be omitted.

As shown in FIG. 2B, in the present embodiment, the end member 4 forming the opening 1 is extended from the opening 1 so as to protrude from the opening 1, and an intermediate ring 41 is placed over the portion. A right-angled elbow-shaped circular pipe piece inserted therein and attached to the end member 4 in abutting manner. However, it is a matter of course that the pipe joint 8 may have another appropriate structure such as being directly attached to the heat insulating wall 12. In this example, one end 81
Is formed at the same level as the lower part of the end member 4 of the opening 1 so that when condensed water falls from the bag 2 to the fitting 8, drainage can be performed in the direction of the opening 1. In addition, you may make it the mobility of water improve by making the pipe joint 8 a little upward gradient outward.

In this embodiment, the bag 2 is attached to the other end 82 of the pipe joint 8 by a hose band 2a. The bag 2 has a shape extending in the upward Z direction from the mounting position, and is formed so as to bulge upward instead of in the lateral direction. Reference numeral 14 denotes a case attached to the heat insulating wall 12 so as to surround the bag 2. The case 14 has a drain outlet 14
a is provided. Also, at the bottom of the case 14,
Insulation material 14b to prevent freezing of water drops falling inside
Is attached.

The internal pressure adjusting mechanism of the present embodiment operates as follows to exhibit its operation and effect. FIG. 4 is a diagram corresponding to FIG.
The state of the bag 2 when the internal pressure fluctuates is shown.

According to the internal pressure adjusting mechanism shown in FIG. 1, the dew water generated in the bag 2 as shown in FIG. 2 swells to the test chamber 11 side due to the fluctuation of the internal pressure, as shown in FIG. As shown in FIG. 4 (e), in an apparatus having operating conditions in which the internal pressure fluctuation is small or the internal pressure of the test chamber 11 is small on the negative pressure side, as shown in FIG. There is a possibility that the dew condensation water P remains in the bag 2 on the inclined plate 3 and stays without being discharged. In the internal pressure adjusting mechanism of the present example, it is possible to reliably drain the water even if the device has the above operating conditions. It should be noted that the mechanism of this example exerts a sufficient internal pressure adjusting function as in the mechanism of FIG.

In the internal pressure adjusting mechanism of this embodiment, when the test chamber 11 is at a normal pressure and there is no fluctuation in the internal pressure, the bag 2 is in a neutral state as shown in FIG. From this state, even if the inside of the test chamber 11 becomes hot and humid, etc., the bag 2 expands, and the air inside the bag 2 is cooled by the outside air due to the temperature and humidity, and dew condensation occurs therein, As shown in FIG. 4 (b), since the bag 2 is swollen upward by the internal pressure,
The condensed water droplets p fall directly into the pipe joint 8 or fall along the pipe joint 8 after traveling inside the bag 2, and fall into the test chamber 11 from the bottom through the end member 4 of the opening 1. It will run down and be processed. Therefore, there is no problem that dew condensation water accumulates in the bag 2 or the pipe joint 8 to cause germs to multiply or to affect the sample in the test chamber 11.

When the test shifts from the high temperature test to the low temperature test, the air in the test chamber 11 contracts to bring the bag 2 into the state shown in FIG. 4 (c), and the outside air is cooled and the outer surface of the bag 2 is cooled. However, if the outside air does not become excessively high in humidity, the amount of water drops p condensed on the outer surface of the bag 2 as dew condensation water P does not increase. In particular, since the environmental test device is usually placed in an air-conditioned room, it is not exposed to an extremely high humidity environment, and the amount of dew condensation water P is small, if any. When the operating conditions change and the bag 2 swells upward, as shown in FIG.
Drops along the outer surface of the bag to the bottom of the case 14, and is discharged from the drain outlet 14a. That is, even when dew condensation water is generated on the outer surface side of the bag 2, a problem such as accumulation of the dew water does not occur. Since the inside of the test chamber 11 is usually set to a pressure higher than the atmospheric pressure to some extent, the bag 2 frequently swells to the outside.

FIG. 5 shows another example of the internal pressure adjusting mechanism to which the present invention is applied. The internal pressure adjusting mechanism of this example has a structure in which a gate-shaped bag supporting rod 9 as an internal supporting member is additionally provided to the mechanism of FIG. In this example, the bag support rod 9 is a hose band 2a.
Are arranged in the bag 2 by being fixed to the portion (2), and hold the bag 2 at a position in the upward Z direction. Note that the bag 2 and the bag support rod 9 may be manufactured in advance integrally. Further, the bag supporting rod 9 may be formed as a single rod so as to support the central portion of the bag 2 without forming the gate as in the present embodiment.

FIGS. 6A to 6C show the state of the bag 2 of this embodiment when the internal pressure fluctuates. According to the internal pressure adjusting mechanism of the present embodiment, the bag 2 is held in the upward Z direction by the bag support rod 9, so that when the test chamber 11 is at a normal pressure and there is no internal pressure fluctuation, (a) of FIG. When the internal pressure becomes high due to a high temperature and high humidity condition or the like and the internal pressure becomes high as shown in (b), on the other hand, when the internal pressure becomes low due to a low temperature condition or the like and the internal pressure decreases, the air constricts as shown in (c). That is, the upper end position is held at a substantially constant height, and when the internal pressure fluctuates, the dimension in the width X direction, which is a direction perpendicular to the upper portion of the bag supporting rod 9, expands and contracts, and the internal volume changes. Will be done.

As a result, even if dew condensation occurs on the inner and outer surfaces of the bag 2 when the bag 2 expands or contracts due to the temperature and humidity conditions of the test chamber 11, as shown in FIG. A problem such as falling along the outer surface, being discharged through the pipe joint 8 or the case 14 and accumulating on the inner and outer surfaces of the bag 2 does not occur.

In the internal pressure adjusting mechanism of this embodiment, since the bag 2 is held at the upper external side opposite to the test chamber 11, the bag 2 expands and contracts only on the upper side.
With a bag of the same size, the change in volume for adjusting the internal pressure is almost halved as compared with those in FIGS. Therefore, in the mechanism of the present example, the size of the bag 2 is increased as needed. The description of the same structural parts as those of the internal pressure adjusting mechanism of FIGS. 1 and 3 and the functions and effects produced thereby will be omitted.

[0032]

As described above, according to the present invention, in the first aspect of the present invention, the seal member is provided in the opening formed in the wall of the test chamber.
This does not fall on the DUT. Further, since the seal member is provided so as to block conduction between the inside and the outside of the gas, the internal gas does not leak to the outside. as a result,
There is no heat loss and no power consumption. When a humidifier is provided, there is no waste of humidification power. or,
Frost of the evaporator due to invasion of outside air is also eliminated, and continuity of the test can be ensured.

Further, since the sealing member is formed in a bag shape made of a deformable and flexible material, the sealing member contracts or swells without any resistance, so that the internal pressure adjusting function is extremely good. As a result, internal pressure fluctuations can be almost completely prevented with respect to temperature changes and vibration of the DUT. Further, since a bag receiving portion having a predetermined configuration is provided, when condensed water is generated inside and outside the bag under a specific temperature and humidity condition, the dew water is discharged into or out of the test chamber due to the inclination of the receiving member. Can be.
Therefore, there is no problem that the dew condensation water accumulates and germs multiply there, and the internal pressure adjusting function is lowered.

Further, if the bag is sized appropriately,
Large fluctuations in internal pressure, such as when the door is opened and closed, can be absorbed to a considerable extent.

As described above, the internal pressure adjusting mechanism of the present invention eliminates all the disadvantages of the conventional mechanism under an extremely simple and inexpensive configuration in which the bag-shaped sealing member is received by the inclined receiving member. This makes it possible to reliably treat the dew condensation water and has an excellent internal pressure adjusting mechanism.

According to the second aspect of the present invention, an intermediate member is formed such that one end is connected to the opening and the other end is opened upward so as to be drainable in the direction of the opening. Since the member is attached to the other end of the intermediate member and formed so as to swell upward, when the test chamber is in a high-temperature and high-humidity environment or the like, the bag-shaped seal member is located above the other end on the outside. When the condensed water is generated inside by being cooled by the outside air while being swelled, the condensed water falls downward directly or through the seal member and is directed toward the opening through the intermediate member because the seal member is swelled upward. Will be discharged.

On the other hand, when dew condensation occurs on the outer surface of the seal member due to low temperature conditions in the test chamber, the condensed water is small and the seal member frequently swells outward. When dropped along its outer surface. As a result, it is possible to more reliably prevent the problem that dew water accumulates on the inner and outer surfaces of the seal member.

The internal pressure adjusting mechanism according to the second aspect of the present invention has a simple structure in which an intermediate member is provided and a bag-shaped sealing member is attached to the other end, and is inexpensive. And it has the same components as those of the first aspect of the present invention, thereby having the same functions and effects as the first aspect of the invention.

According to the third aspect of the present invention, in addition to the above, since the internal support member is provided in the seal member so as to hold the seal member at an upper position, dew condensation formed on the inner and outer surfaces of the seal member is provided. Water can be surely dropped down along the surface. As a result, dew water can be more reliably treated.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a structural example of a part including an internal pressure adjusting mechanism of a vibration environment combined test apparatus which is an example of an environmental test apparatus to which the present invention is applied.

FIGS. 2A to 2C are explanatory diagrams of the operation of the internal pressure adjusting mechanism.

3A and 3B are cross-sectional views showing another example of the internal pressure adjusting mechanism to which the present invention is applied, wherein FIG. 3A shows the entire structure, and FIG. 3B shows the structure of the fitting portion of the pipe joint and the bag.

FIGS. 4A to 4E are diagrams illustrating the operation of the internal pressure adjusting mechanism.

5A and 5B are sectional views of still another example of the internal pressure adjusting mechanism to which the present invention is applied, wherein FIGS. 5A and 5B show the entire structure of the front and side surfaces, and FIG. 2 shows the structure of the mounting part.

FIGS. 6A to 6C are explanatory diagrams of the operation of the internal pressure adjusting mechanism.

7 (a) to 7 (c) are explanatory views of a conventional internal pressure adjusting mechanism, and FIG. 7 (d) is a plan view of the sealing film of FIG. 7 (c).

[Explanation of symbols]

 Reference Signs List 1 opening 2 bag (seal member) 3 inclined plate (receiving member) 8 pipe joint (intermediate member) 9 bag support rod (internal support member) 10 constant temperature bath part (environmental test device) 11 test chamber 12 wall 20 vibrator part ( Environmental test equipment) 81 One end side 82 Other end side W Sample (DUT) Z Above

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Hiroshi Adachi 3-5-6 Tenjinbashi, Kita-ku, Osaka-shi, Osaka Prefecture Within TA-B-ESPEC Co., Ltd. (72) Takahiro Yamada 3--5 Tenjinbashi, Kita-ku, Osaka-shi, Osaka No. 6 TA Bayespec Co., Ltd. F term (reference) 2G050 BA10 BA11 BA20 CA01 DA02 EA01 EA02 EA04 EC01 5H316 AA15 BB02 CC06 DD06 DD12 EE33 GG01 GG11 GG12 GG15 JJ11

Claims (3)

[Claims] 1. An internal pressure adjusting mechanism provided in an environmental test apparatus having a test chamber capable of imparting at least a temperature environment to a DUT, wherein: an opening formed in a wall of the test chamber; A bag-shaped sealing member made of a flexible material that is deformable and provided in the opening so as to block gas flow between the opening and a sealing member that projects upward from the wall to the opposite side of the test chamber with an upward slope. A receiving member provided to support the seal member when swelled to the opposite side. 2. An internal pressure adjusting mechanism provided in an environmental test device provided with a test chamber capable of imparting at least a temperature environment to a DUT, wherein: an opening formed in a wall of the test chamber; An intermediate member formed so as to be conductive and open at the other end side so as to be able to drain in the direction of the opening, and is attached to the other end side so as to be disconnected and deformable so as to shut off gas conduction between the inside and outside of the test chamber. A bag-shaped sealing member made of a flexible material and formed to swell upward. 3. The internal pressure adjusting mechanism according to claim 2, further comprising an internal support member provided in said seal member so as to hold said seal member at said upper position.