JPH0640052B2 - Environmental test equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal shock device used to investigate the thermal characteristics of various electric and electronic devices, their related parts, assemblies, units, various materials, etc., and to conduct reliability tests. Environmental test equipment such as a constant temperature device, in particular, having at least a low temperature gas generation part and a test tank,
The present invention relates to an environmental testing device which is configured to be able to supply the low temperature gas generated in the low temperature gas generating section to the test tank and which is equipped with an auxiliary cooling device for the test tank.

[0002]

Auxiliary cooling in this type of environmental test equipment
The equipment is usually liquefied carbon dioxide (LCO ₂) Or liquefied nitrogen gas
Su (LN₂) Is directly supplied to the test tank. One example is shown in FIG.
The thermal shock device will be described. This device is a test
Tank 1, high temperature gas generator 2 connected to this, and low temperature gas
It has a generator 3. The high temperature gas generator 2 is a gas outlet
21 to communicate with the test tank 1 through the gas suction port 22
Inside the heater 23 and the outlet 21
It has a gas circulation fan 24 facing it. Fan 24 is
It is driven by the controller 241. Outlet 21 and suction
Insulation dampers 25 and 26 for opening and closing these are installed at the mouth 22.
The dampers are mounted on the transmission mechanism 27 of the drive unit 270.
It can be opened and closed simultaneously by the motor 28 via.

On the other hand, the low-temperature gas generating section 3 communicates with the test tank 1 through a gas outlet 31 and a gas inlet 32, and has a cooler 33 and a gas circulation fan 34 facing the outlet 31 inside. . The fan 34 is the motor 3
Driven at 41. Blow-out port 31 and suction port 3
2 is provided with heat insulating dampers 35 and 36 for opening and closing them, and these dampers can be simultaneously opened and closed by a motor 38 via a transmission mechanism 37 of a drive unit 370.

Although the drive units 270 and 370 are shown separately from the apparatus body in the figure, they are actually provided in the apparatus body. The auxiliary cooling device 4 of the test tank 1 includes a gas supply nozzle 41 provided in the tank and a solenoid valve 42 connected to the nozzle.
Further, the auxiliary cooling gas can be supplied by opening the valve 42 from the liquefied gas (LCO ₂ , LN ₂ etc.) cylinder 44 including the exhaust port 43 provided in the test tank 1 and connected to the electromagnetic valve 42.

According to this thermal shock device, during the high temperature exposure operation, the low temperature side dampers 35, 36 are closed and the electromagnetic valve 42 is closed, while the high temperature side damper 2 is closed.
5, 26 are opened, the high-temperature gas generated in the high-temperature gas generating section 2 is sent from the blow-out port 21 into the test tank 1 by the operation of the fan 24, and from there, through the suction port 22,
The sample A is circulated so as to return to the generation unit 2, and thus the inside of the test tank 1 is maintained at a predetermined high temperature, and the sample A is exposed to high temperature.

Further, during the low temperature exposure operation, the high temperature side dampers 25 and 26 are closed while the low temperature side damper 3 is used.
5, 36 are opened, the low-temperature gas generated in the low-temperature gas generation part 3 is sent from the blow-out port 31 into the test tank 1 by the operation of the fan 34, and from there, through the suction port 32,
The sample A is circulated so as to return to the generation unit 3, and thus the inside of the test tank 1 is maintained at a predetermined low temperature, and the sample A is exposed to the low temperature.

In order to rapidly cool the sample A at the start-up of the low temperature exposure operation and at the subsequent operation, the auxiliary cooling device 4 is used if necessary. According to this apparatus 4, when the electromagnetic valve 42 is opened, the liquefied gas for auxiliary cooling is supplied from the cylinder 44 into the test tank 1, and the gas absorbs heat from the sample A by its latent heat of vaporization to cool it. Excess gas in the tank 1 due to the introduction of this gas is exhausted from the exhaust port 4
3 is pushed out of the device.

The auxiliary cooling device in the environmental testing device is generally as described above.

[0009]

However, this type of auxiliary cooling device has the following problems. During the low temperature exposure operation, the temperature of the gas discharged from the exhaust port 43 of the test tank 1 is lower than the ambient temperature of the device, so that dew condensation occurs on the outer wall surface 430 of the device around the exhaust port 43, and this flows down to the floor surface of the device installation. There is an inconvenience such as soiling. For auxiliary cooling specifications,
Since the exhaust port 43 is still open, the outside air enters the test tank 1 from here, and the humidity thereof causes frost on the cooler 33 and the like in the low temperature gas generating portion, which in turn reduces the refrigerating capacity,
In addition, because of the defrosting work, there may occur a situation where the test time that can be continuously performed is shortened. When some trouble occurs in the solenoid valve 42 and the plunger of the solenoid valve does not operate and remains in the open state, the liquefied gas is released until the liquid in the cylinder 44 is exhausted, and as a result, in the test tank 1. In some cases, the temperature cannot be controlled and the sample is overcooled and damaged.

Therefore, the present invention has at least a low-temperature gas generating section and a test tank, and is configured so that the low-temperature gas generated in the low-temperature gas generating section can be supplied to the test tank and also assists the test tank. In an environmental testing device equipped with a cooling device, when the auxiliary cooling device is in operation, dew condensation on the outer wall surface of the device due to low temperature gas discharged from the test tank to the outside is suppressed, and the inconvenience such as dirt on the floor surface of the device It is intended to prevent the invasion of the outside air from the low temperature gas discharge portion and suppress the frost formation in the low temperature gas generation portion.

Further, the present invention can achieve such an object, and further, even if trouble occurs in the valve for controlling the supply and shutoff of the auxiliary cooling gas in the auxiliary cooling device, the article in the test tank is supercooled. The present invention is intended to provide an environmental test device that can prevent such a situation.

[0012]

In order to achieve the above-mentioned object, one of the objects of the present invention is to have at least a low-temperature gas generating section and a test tank, and to conduct a test on the low-temperature gas generated in the low-temperature gas generating section. An environment test device configured to be supplied to a tank and provided with an auxiliary cooling device for the test tank, wherein the auxiliary cooling device is an auxiliary cooling gas supply port and an exhaust provided in the low temperature gas generating section. Port, means for supplying auxiliary cooling gas to the gas supply port, valve box opening upward, exhaust valve provided at the bottom of the valve box, and exhaust path connecting the exhaust port and the exhaust valve, the exhaust valve Provides an environment test apparatus including a pressure-sensitive actuating valve body that opens when the atmospheric pressure in the exhaust passage is equal to or higher than a predetermined pressure.

According to the present invention, in addition to the above respective components, a gas supply abnormality from a damper for opening and closing a communication portion between the low temperature gas generating portion and a test tank, a drive portion of the damper, and the auxiliary cooling gas supply means. There is provided an environmental test device comprising: a means for detecting the above; and a control section for causing the drive section to close the damper based on the abnormality information from the abnormality detection means.

In any case, at least the side wall of the valve box is formed of double walls spaced apart from each other, and the exhaust valve is arranged in the inner wall of the double wall to the outer wall surface of the environmental test apparatus. You may make it possible to prevent dew condensation more reliably.

[0015]

According to the environment testing apparatus of the present invention, the low temperature gas generated in the low temperature gas generating section is supplied to the test tank and the article in the test tank is exposed to the low temperature. Further, the operation of the auxiliary cooling device is performed by supplying the auxiliary cooling gas from the auxiliary cooling gas supply means to the low temperature gas generating portion through the auxiliary cooling gas supply port.

The supplied cooling gas flows from the low temperature gas generating portion into the test tank and is used for cooling the articles in the test tank. The surplus gas in the test tank and the low-temperature gas generation part by the supply of the cooling gas goes out of the apparatus through the exhaust port of the low-temperature gas generation part through the exhaust passage and opening the exhaust valve at the atmospheric pressure.
Therefore, in this state, no outside air enters from the valve.

When the auxiliary cooling gas is not supplied, or when the internal pressure of the exhaust passage is still lower than the predetermined pressure even if it is supplied, the exhaust valve is closed, and outside air is prevented from entering through this valve. Since the exhaust valve is housed in the valve box, the dew condensation due to the exhaust mainly occurs inside the box, and the dew condensation on the outer wall surface of the environmental test apparatus is suppressed.

When the valve box has a double wall structure, the dew condensation mainly occurs on the inner wall surface of the double wall which is spaced apart from the outer wall, and the dew condensation on the outer wall surface of the environmental test apparatus is further increased. Suppressed. A damper that opens and closes a communication portion between the low-temperature gas generation unit and the test tank, a drive unit of the damper, a unit that detects a gas supply abnormality from the auxiliary cooling gas supply unit, and an abnormality information from the abnormality detection unit. When the drive unit is equipped with a control unit for closing the damper, when the gas supply abnormality occurs, the damper may be closed and the auxiliary cooling gas may be continuously supplied. Supercooling is prevented.

[0019]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic sectional view of a thermal shock device according to one embodiment.
FIG. 3 is a diagram showing a structure of an exhaust valve and its vicinity in an auxiliary cooling device in the device. This device has substantially the same structure as the conventional device shown in FIG. 3 except for the auxiliary cooling device 5. Therefore, the same parts as those in the apparatus shown in FIG. 3 are designated by the same reference numerals, and the detailed description of the structure will be omitted.

The auxiliary cooling device 5 includes an auxiliary cooling gas supply port 51 and an exhaust port 52 provided on the side wall of the low temperature gas generating section 3, and a gas injection nozzle 53 is attached to the supply port 51. A liquefied carbon dioxide cylinder 55 is connected to the nozzle 53 through a solenoid valve 54 by piping. On the other hand, an exhaust duct 56 is connected to the exhaust port 52, and its end portion reaches the apparatus ceiling portion 6. The ceiling portion 6 is provided with a valve box 57 that opens upward.

As shown in FIG. 2, the box has a double structure in which the side peripheral wall portion is composed of an outer wall 571 and an inner wall 572 arranged with a gap therebetween. Outer wall 571
The upper end portion 571a is bent outward to form a flange, which is screwed to the apparatus body. A mesh plate 574 is arranged at the upper end opening of the valve box 57 to prevent foreign matter from falling in. The upper end 572a of the inner wall 572 is bent inward to form a flange, and the mesh plate 574 is screwed and fixed thereto.

The bottom of the box 57, in other words, the outer wall 57
An exhaust valve 58 is arranged at the bottom of 1. This valve 58 is O
A valve seat 582 provided with a ring (O-ring) 581, and a flat valve body 583 arranged so as to be vertically movable so as to come into contact with the O-ring 581 in an airtight manner or to move upward and away from each other.
Is included. The valve seat 582 is made of resin and has a function of cutting off heat. The valve body 583 has a shaft 5 perpendicular to the center.
84, which is loosely fitted in the central hole 585a of the support plate 585 that covers the valve seat 582. The lower ends of the inner wall 572 and the support plate 585 are fixed and supported by the valve seat.

Further, in the auxiliary cooling device, when an abnormality occurs in the solenoid valve 54, the solenoid valve 54 is not closed and more than necessary gas is continuously supplied from the cylinder 55 to the low temperature gas generating portion 3, this is detected. The control unit 58 includes a detection unit (temperature sensor in this example) S and a control unit 58 that receives an abnormality detection signal from the detection unit. When the control unit 58 receives the abnormality detection signal from the detection unit S, the low temperature gas generation unit Open / close damper 3
The motor 38 for driving the motors 5, 36 is instructed to close the damper.

The detection unit S is a temperature sensor for detecting an abnormal temperature drop of the gas generation unit 3 due to an abnormal gas supply from the cylinder 55, but other detection means may be used. The cold shock device described above is the same as the conventional device shown in FIG. 3 in terms of the high temperature exposure operation by the high temperature gas generation unit 2 and the low temperature exposure operation by the low temperature gas generation unit 3, and therefore description thereof is omitted here. The auxiliary cooling device 5 is used for smoothing the initial temperature drop in the low temperature exposure operation, or for auxiliary cooling of the test tank article in the subsequent low temperature exposure operation.

To operate the apparatus 5, the solenoid valve 54 is opened and the liquefied carbon dioxide gas supplied from the cylinder 55 is supplied to the gas injection nozzle 5
It is carried out by supplying the low temperature gas generating section 3 to the low temperature gas generating section 3. The supplied carbon dioxide gas flows into the test tank 1 from the low temperature gas generating section 3 and is used for cooling the articles in the tank. Excess gas in the low temperature gas generation part 3 and the test tank 1 due to the supply of liquefied carbon dioxide is guided from the exhaust port 52 provided in the low temperature gas generation part 3 to the exhaust valve 58 via the exhaust duct 56, and the internal pressure of the duct is reduced. When the pressure exceeds a predetermined pressure, the valve body 583 is pushed up by the atmospheric pressure and flows upward from the ceiling portion. As described above, while the internal gas is being discharged from the valve body 58 to the outside, the atmospheric pressure from the inside prevents the outside air from entering the valve.

When the air pressure in the duct 56 is lower than a predetermined pressure, the valve body 583 is in airtight contact with the O-ring 581 of the valve seat 582 due to its own weight and atmospheric pressure, thereby preventing the outside air from entering. Needless to say, even when the auxiliary cooling device 5 is not used, the valve body 583 is in airtight contact with the O-ring 581 to close the valve 58. Therefore, in both low temperature exposure operation and high temperature exposure operation,
Regardless of whether or not the auxiliary cooling device 5 is used, the low-temperature gas generator 3
Ingress of moist outside air is prevented, and frost formation in the low temperature gas generation unit 3 is suppressed to that extent. Therefore, there is an advantage that the low temperature exposure operation can be continuously performed for a long time.

Further, since the exhaust valve 58 is housed in the valve box 57, when low temperature gas is discharged from this valve by the operation of the auxiliary cooling device 5, dew condensation due to the exhaust is mainly generated in this box. The occurrence of dew condensation on the outer wall surface 61 of the ceiling is suppressed, and the inconvenience caused when a large amount of dew condensation directly occurs on the outer wall surface 61 is avoided. In addition, in the above-described embodiment, since the side peripheral wall portion of the box 57 is formed as a double wall, dew condensation mainly occurs on the inner wall 572 of the double wall that is isolated from the outer wall 571. Dew condensation on the outer wall surface 61 of the ceiling is further suppressed.

The dew condensation that has occurred on this box is due to the outer wall 57.
1 and the inner wall 572 are collected in a gap, which evaporates spontaneously. Further, in the operation of the auxiliary cooling device 5, the solenoid valve 54
If a malfunction occurs in the cylinder 55 and liquefied carbon dioxide gas is supplied more than necessary from the cylinder 55, which may damage the articles in the test tank 1, the state is detected by the detection unit S, and the control unit 58. Receives the abnormality detection signal from the detector S, drives the motor 38, and closes the dampers 35, 36 of the low temperature gas generator 3. Therefore, even if the liquefied carbon dioxide gas is continuously supplied, there is an advantage that the supercooling of the article in the test tank is prevented.

[0029]

As described above, according to the present invention, at least a low temperature gas generating section and a test tank are provided, and the low temperature gas generated in the low temperature gas generating section can be supplied to the test tank. An environmental testing device equipped with an auxiliary cooling device for the test tank, wherein when the auxiliary cooling device is in operation, dew condensation is suppressed on the outer wall surface of the device by low temperature gas released from the test tank to the outside. It is possible to provide an environmental test device capable of avoiding inconveniences such as dirt on the floor surface of the device installation, and preventing the outside air from invading from the low temperature gas discharge part to suppress frost formation in the low temperature gas generating part and the like.

Further, it is possible to provide an environmental test device capable of preventing the supercooling of the articles in the test tank even if a trouble occurs in the valve for controlling the supply and shutoff of the auxiliary cooling gas in the auxiliary cooling device. .

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an embodiment of the present invention.

FIG. 2 is a schematic configuration diagram of a valve box and an exhaust valve housed therein.

FIG. 3 is an explanatory diagram of a conventional example.

[Explanation of symbols]

 1 Test Tank 2 High Temperature Gas Generating Part 3 Low Temperature Gas Generating Part 31 Gas Blowout Port 32 Gas Suction Ports 35, 36 Opening / Closing Damper 370 Drive Unit 37 Transmission Mechanism 38 Motor 5 Auxiliary Cooling Device 51 Auxiliary Cooling Gas Supply Port 52 Exhaust Port 53 Gas Injection Nozzle 54 Solenoid valve 55 Liquefied carbon dioxide cylinder 56 Exhaust duct 57 Valve box 571 Outer wall 572 Inner wall 58 Exhaust valve 581 O-ring 582 Valve seat 583 Pressure-sensitive valve body 58 Control section S Temperature sensor

Claims (3)

[Claims] 1. A low temperature gas generating section and a test tank are provided, and a low temperature gas generated in the low temperature gas generating section is configured to be supplied to the test tank, and an auxiliary cooling device for the test tank is provided. An environment testing device provided, wherein the auxiliary cooling device is provided with an auxiliary cooling gas supply port and an exhaust port provided in the low temperature gas generating section, a means for supplying an auxiliary cooling gas to the gas supply port, and an upward opening. Valve box,
An exhaust valve provided at the bottom of the valve box, and an exhaust path connecting the exhaust port and the exhaust valve are provided, and the exhaust valve is provided with a pressure-sensitive operating valve body that opens when the atmospheric pressure in the exhaust path is equal to or higher than a predetermined pressure. Environmental testing equipment characterized by 2. The environmental test apparatus according to claim 1, wherein at least the side wall portion of the valve box is formed of double walls spaced apart from each other, and the exhaust valve is installed in the inner wall thereof. 3. A damper that opens and closes a communication portion between the low temperature gas generation unit and the test tank, a drive unit of the damper, a unit that detects a gas supply abnormality from the auxiliary cooling gas supply unit, and the abnormality detection unit. 3. The environmental test device according to claim 1, further comprising a control unit that causes the drive unit to close the damper based on the abnormality information of 3.