JPH0792429B2 - Environmental test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to various electric and electronic devices, parts thereof, various materials, etc., for reliability testing under various temperatures or under temperature and humidity, screening, etc. The present invention relates to an environmental test device for carrying out, and particularly to an environmental test device equipped with an air-cooled refrigerator.

[Conventional technology]

The environmental testing device is generally equipped with a refrigerator for controlling the temperature in the test tank, which is usually an air-cooled refrigerator, and its condenser is cooled by a condenser cooling blower. .

[Problems to be Solved by the Invention]

 However, this type of environmental testing device has the following problems.

The exhaust air that has passed through the condenser is discharged to the environment test apparatus installation space by the condenser cooling blower as it is, and the work environment of the space is deteriorated by exhaust dust, exhaust heat, and ambient dust rising due to the exhaust air.

When the environment test device installation space is a clean room, dust generated from the rotating part of the blower or the like is scattered in the room as it is, and the room is contaminated.

The temperature of the environment test device installation space rises due to the exhaust heat from the condenser and the blower, and there is a risk that the cooling of the condenser will be insufficient in the summer or the like, or the air conditioning load of the space will increase.

The motor for driving the gas agitating member (usually a fan) in the test tank is generally exposed on the outer wall of the environmental test device, and therefore heat and dust generated from the motor are scattered around and the surrounding environment is kept. It deteriorates, and when the environment test equipment installation space is a clean room, it is contaminated.

As a means for solving the above problem, for example, a condenser cooling blower or a machine room including the same is connected to an exhaust facility so that exhaust gas passing through the condenser is discharged to the outside, and heat generated from a stirring member drive motor, If necessary, dust may be discharged to the outside by the exhaust equipment together with the exhaust gas passing through the condenser, but this has the following problems.

That is, when the exhaust volume (exhaust capacity) of the exhaust equipment is constant, the number of connected environmental test devices may change,
Because the exhaust amount of the condenser cooling blower in each connected environmental testing device is different, the exhaust equipment has an amount of air passing through the condenser in each environmental testing device (hereinafter,
If the amount of condensed air cannot be exhausted as an appropriate amount for normal operation of the refrigerator, then there is an excessive amount of condensed air, in other words, if the exhaust amount of the blower for cooling the condenser is less than the exhaust amount of the exhaust equipment. , Insufficient amount of condensed air, in other words,
If the exhaust amount of the blower for cooling the condenser> the exhaust amount of the exhaust equipment occurs, and the amount of condensed air is excessive, the refrigerant pressure on the high-pressure side of the refrigeration circuit becomes low and the refrigeration capacity decreases when the ambient temperature is low. When the amount of condensed air is insufficient, the refrigerant pressure on the high pressure side of the refrigeration circuit becomes high when the ambient temperature is high, which causes trouble. Further, when the amount of condensed air is insufficient, that is, as described above, when the exhaust amount of the condenser cooling blower is larger than the exhaust amount of the exhaust equipment, the pressure in the exhaust duct in the exhaust equipment becomes high, Dust may leak into the environment test apparatus installation space from the space between the ducts and the like, and when the space is a clean room, the room is contaminated.

In addition, if the amount of condensed air becomes unstable because the exhaust volume of the exhaust equipment becomes unstable, etc., the refrigerant pressure on the high-pressure side of the refrigeration circuit becomes unstable, and the refrigeration capacity also becomes unstable. There is also a problem that the temperature in the test tank is not stable and the reliability of the test is lowered, and if the pressure in the duct of the exhaust equipment rises too much, dust leaks to the surroundings as described above.

In order to stabilize the amount of condensed air at an appropriate level, it is possible to measure the wind speed in the exhaust duct and adjust the exhaust amount. A straight pipe part with a certain size is required on the up and downwind side,
A commutator is also needed. As described above, since the wind speed measurement requires a special structure and is generally difficult to measure, it is not practical to constantly control the exhaust capacity of the exhaust equipment.

Therefore, the present invention is, first, an environmental test apparatus equipped with an air-cooled refrigerator, wherein exhaust gas passing through the condenser by a blower for cooling the condenser is installed outside the apparatus installation space by an exhaust facility separately provided at the environmental test apparatus installation location. Can be discharged to
In that case, for example, when the exhaust volume (exhaust capacity) of the exhaust equipment is constant, the number of connected environmental test devices may vary, or the connected exhaust volume of the cooling fan of the environmental test device may differ. The amount of condensed air passing through the condenser can be either normal operation of the refrigerator or normal operation of the refrigerator even when the exhaust amount of the exhaust equipment fluctuates. It is a first object of the present invention to provide an environmental test device capable of monitoring and controlling an appropriate amount capable of suppressing the generation of dust or heat from the peripheral portion of the device or the peripheral portion thereof into the space around the device.

Further, the present invention is an environmental test device equipped with an air-cooled refrigerator, wherein exhaust gas passing through the condenser by a condenser cooling blower is provided outside the device installation space by an exhaust facility separately provided at the environmental test device installation location. It can be discharged, and in that case, for example, when the exhaust volume (exhaust capacity) of the exhaust equipment is constant, the number of connected environmental test devices fluctuates, or the condenser in each connected environmental test device Even if the exhaust volume of the cooling blower is different or the exhaust volume of the exhaust equipment fluctuates, the condensed air volume passing through the condenser can achieve normal operation of the refrigerator and the blower and its surroundings. The amount of dust and heat generated from the part can be monitored and controlled to an appropriate amount that can be prevented from leaking to the space around the device.
Further, it is a second object of the present invention to provide an environmental test device capable of discharging dust and heat generated from a motor for driving a member for agitating the gas in the device test tank to the outside of the device installation space together with the exhaust gas passing through the condenser. And

[Means for Solving the Problems]

The first object of the present invention is, in an environmental test device equipped with an air-cooled refrigerator, exhausting exhaust gas that has passed through a condenser by a blower for cooling the condenser of the refrigerator, from the environmental test device installation location to the outside. An exhaust box for guiding to an exhaust facility, an exhaust amount adjusting means connected between the exhaust box and the exhaust facility, and a difference between an internal pressure of the box and an atmospheric pressure outside the box, which is attached to the exhaust box. And an exhaust gas adjusting means for controlling the exhaust amount adjusting means so as to maintain the differential pressure value indicated by the differential pressure gauge at a predetermined value. .

Further, the second object of the present invention is, in the environmental test apparatus for achieving the first object, enclosing a drive motor of a member for agitating air in a test tank of the environmental test apparatus and connected to the exhaust box, This is accomplished by providing a motor dust scattering prevention box for guiding air around the motor to the exhaust box.

The blower for cooling the condenser is, of course, a blower which is arranged near the condenser and directly acts on the condenser, and when a blower for guiding exhaust gas from the blower to the exhaust box is provided, Such a blower is also included.

The exhaust amount adjusting means may be an air amount adjusting damper or the like provided for each environmental test device.

[Action]

In the environmental testing device of the present invention, the exhaust box is connected to the exhaust equipment separately provided at the environmental testing device installation location through the exhaust amount adjusting means.

The exhaust gas that has passed through the condenser due to the operation of the blower for cooling the condenser is guided to an exhaust box, and is further guided to the exhaust equipment through the exhaust volume adjusting means by the box, and the exhaust equipment is installed in the environment test equipment installation space. It is discharged to the outside.

At this time, the difference between the internal pressure of the box and the external atmospheric pressure is monitored by a differential pressure gauge attached to the exhaust box, and the exhaust air volume is manipulated and adjusted by the exhaust volume adjusting means so that the differential pressure value maintains a predetermined value. Thereby, the amount of condensed air passing through the refrigerator condenser can achieve normal operation of the refrigerator, or can achieve normal operation of the refrigerator and generate dust from the condenser cooling blower or its peripheral portion. It is maintained at an appropriate amount that can suppress heat generation from leaking to the space around the device.

When the motor dust scattering prevention box is provided, it is possible to discharge dust and heat generated from the stirring member drive motor to the outside together with the exhaust gas that has passed through the condenser.

In order to more reliably discharge the dust generation and heat generation to the outside, it is desirable to set the predetermined value of the differential pressure gauge so that the internal pressure of the exhaust box is slightly lower than the external atmospheric pressure.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows the front of the environment test apparatus 1 which is an embodiment, and FIG. 2 shows a schematic cross section taken along the line 2-2 of FIG.

This apparatus 1 is equipped with a test tank 11 that can be opened and closed by a door 11a, and a machine room 12 (see FIG. 2) is located below the test tank 11, and the machine room is an air-cooled type for controlling the temperature inside the test tank. A condenser 13 of the refrigerator, a propeller fan 14 and a compressor 15 that directly act on the condenser 13 are arranged, and a fan 14 is provided at the machine chamber outlet.
A blower (in this example, a multi-blade fan) 16 that guides the exhaust gas from the exhaust gas to an exhaust box 17 that also serves as a differential pressure measurement box described later is arranged. The evaporator and the like of the refrigerator are arranged in the air conditioning unit in the test tank 11. Although not shown in the drawing, a heater for temperature control, a humidifying device, and the like are also arranged in the air conditioning unit.

Motors 18 and 19 are arranged on the ceiling of the test tank 11, and the motor drives a fan for air agitation (not shown) arranged in the test tank 1.

An apparatus control unit 20 is provided on the front side surface of the test tank 11, and an exhaust box 17 is provided on the rear side surface of the test tank (rear of the control unit) so as to surround the blower 16, and the box serves as a differential pressure gauge. Manometer 21 is connected in series. In addition, some or all of the water supply means to the humidifier is also arranged in this box.

As shown in FIG. 3, the upper end of the box 17 is connected to a single exhaust facility 3 common to a plurality of environmental test devices 1. The exhaust equipment 3 has an exhaust blower 31 at the end, and a branch duct 33 extends from a main duct 32 extending from the blower, and each branch duct 33 is attached to the upper end of the box 17 via an exhaust volume adjusting device 34. It is connected. The exhaust amount adjusting device 34 includes a rotatable air amount adjusting damper 34a.

When each environmental test device 1 is operated and the propeller fan 14 and the blower 16 are turned, ambient air passes so as to cool the condenser 13 and is discharged from the blower 16 into the box 17. The exhaust gas discharged into the box 17 after passing through the condenser is discharged to the outside through the branch duct 33 and the main duct 32 by the operation of the exhaust blower 31 common to each environmental test device 1.
During this time, the difference between the internal pressure of the box 17 and the atmospheric pressure outside the box can be observed by the manometer 21, and the exhaust is performed so that the differential pressure value becomes a predetermined value (for example, a value within a range of ± 0.3 mmAq). The opening degree of the damper 34a in the amount adjusting device 34 is adjusted.

By adjusting the opening degree of the damper, the amount of condensed air passing through the condenser 13 becomes appropriate, the refrigerant in the condenser 13 is condensed in a desired state, and the refrigerator operation is stably and normally performed. As a result, the temperature inside the test tank 11 is accurately controlled and stabilized, and the reliability of the test apparatus 1 is improved.

In addition, the exhaust gas discharged from the blower 16 does not scatter around the test device 1, and the box 17 and the exhaust amount adjusting device 3
4, exhaust duct blower 3 through branch duct 33 and main duct 32
Since it is released to the outside by 1, the dust generated from the machine room 12, the blower 16 and the like is directly scattered around the test apparatus 1 along with the exhaust from the blower 17, and the exhaust heat is directly exhausted. There is no fear that the surrounding environment will deteriorate due to dust from the surrounding being soared by the exhaust air.

When the device installation space is a clean room or the like that needs to prevent dust contamination, in order to reliably prevent ambient leakage of dust from the machine room 12, the blower 16, etc., the predetermined differential pressure value is, for example, -0.3 ~ It should be about -0.5 mmAq and keep the inside of the box 17 at negative pressure.

FIG. 4 shows another embodiment.
Then, a slightly taller exhaust box 41 is provided in place of the box 17 in the apparatus of the embodiment shown in FIG. 1, and a motor for driving an air agitation fan in the test tank 11 is further provided.
18 and 19 are covered with a dust scattering prevention box 42, and the box 42 is connected to the box 41. Further, a branch duct 35 is used instead of the exhaust branch duct 33 in the embodiment of FIG.
The branch duct is connected to a main duct 32 connected to an exhaust blower 31, and an exhaust amount adjusting device is used.
It is connected to the upper end side surface of the box 41 via 36.
The displacement control device 36 includes a damper 36a whose opening can be adjusted. Further, the box 42 surrounding the motors 18, 19 has an outside air suction hole 42a at a position above each motor.
Except for the points described above, the environment test apparatus 1 shown in FIG.

According to this environmental test device 4, the exhaust gas discharged from the blower 16 after passing through the condenser is sucked into the branch duct 35 via the box 41 and the exhaust amount adjusting device 36, and then from the main duct 32.
Through a common exhaust blower 31 to the outside.
Along with this, the air in the box 42 surrounding the motors 18, 19 is also sucked into the branch duct 35 and discharged to the outside.

While operating the environmental test apparatus 4, observe the manometers 21 connected to the box 41 so that the internal pressure of the box 41 is slightly lower than the external atmospheric pressure (the differential pressure is, for example, −0.3 to −0.5 mm).
By adjusting the opening degree of the damper 36a (to be approximately Aq), the amount of condensed air passing through the condenser 13 is maintained at an appropriate amount for normal operation of the refrigerator, and the box 41
Maintaining a negative pressure inside, through the branch duct 35 and the main duct 32 without leaking dust from the machine room 12, the blower 16, etc., heat generation and dust from the motors 18, 19 to the surroundings. It can be discharged to the outside by the exhaust blower 31, as a result, the reliability of the device is improved, the working environment around the environmental test device is deteriorated, and when the surrounding is a clean room, the room is contaminated. The risk of being reduced is that much.

In the case of the environmental test device 4, since the dust and heat generated from the motors 18 and 19 can be discharged to the outside together with the exhaust from the blower 16, the motors 18 and 19 can be discharged.
There is also an advantage that the entire configuration including the exhaust means is extremely simplified, as compared with the case of separately providing a means for discharging dust from the outside.

If the exhaust boxes 17 and 41, which also serve as the differential pressure measurement boxes in the environmental test devices 1 and 4, are formed so that the wind speeds in these boxes are sufficiently low, the influence on the static pressure is reduced, so the internal pressure of the boxes is reduced. The reference value for determining whether or not the difference between the external atmospheric pressure and the external atmospheric pressure is within the allowable range may be set to "0". If the wind speed cannot be sufficiently reduced, the reference value may be slightly shifted to correct this. .

In any of the environment testing devices 1 and 4 described above,
For example, when the exhaust amount (exhaust capacity) of the exhaust blower 31 in the exhaust equipment 3 is constant, the number of connected environmental test devices may change, or the fan 14 or the blower for cooling the condenser in each connected environmental test device. Even if the exhaust volume of 16 is different or the exhaust volume of the exhaust blower 31 fluctuates, the exhaust volume is adjusted so that the differential pressure value indicated by the differential pressure gauge 21 attached to the exhaust boxes 17 and 41 is maintained at a predetermined value. By adjusting the opening degree of the dampers 34a and 36a of the devices 34 and 36, the condensed air amount can achieve the normal operation of the refrigerator, or the normal operation of the refrigerator and the machine room 12 or the blower 16 It is possible to easily control to an appropriate amount that can suppress the generation of dust and heat generated from the like to the space around the device.

Note that the present invention can be implemented in various modes other than the above-described embodiment. For example, in the devices 1 and 4, when exhaust gas from the propeller fan 14 of the refrigerator is directly sent to the rear of the device, a differential pressure measurement box is provided there. An exhaust box that doubles as the
It is also possible to omit the blower 16. Also in the above embodiment, the blower 16 can be omitted. However, when the exhaust air from the propeller fan 14 is redirected and the air passing through the condenser from the machine chamber 12 to the boxes 17 and 41 is directed to the boxes 17 and 41 as in the above-mentioned embodiment, the blower 16 is used.
It is desirable to reduce the load on the exhaust equipment 3 by providing the above to facilitate the design.

〔The invention's effect〕

As described above, according to the present invention, an environmental test device provided with an air-cooled refrigerator, the exhaust gas passing through the condenser by the blower for cooling the condenser, if it is directly discharged to the surroundings of the environmental test device. In order to prevent the deterioration of the work environment due to direct dust emission to the surroundings of the equipment, dust rise due to exhaust heat or exhaust, etc., separately from the location where the environmental test equipment is installed via the exhaust box and exhaust volume adjustment means. It is possible to discharge to the outside of the equipment installation space by the provided exhaust equipment,
Moreover, in that case, for example, when the exhaust amount (exhaust capacity) of the exhaust equipment is constant, the number of connected environmental test devices varies, or the exhaust amount of the condenser cooling blower in each connected environmental test device. Even when the exhaust amount is different or the exhaust amount of the exhaust equipment changes, the condenser is controlled by controlling the exhaust amount adjusting means so that the differential pressure value indicated by the differential pressure gauge attached to the exhaust box is maintained at a predetermined value. The amount of condensed air that should pass through the refrigerator can achieve normal operation of the refrigerator, or normal operation of the refrigerator can be achieved, and dust and heat generated from the blower and its surroundings can be exhausted from the exhaust box etc. It is possible to provide an environmental test device capable of monitoring and controlling to an appropriate amount that can suppress leakage to the environment.

Further, according to the present invention, in an environmental test device provided with an air-cooled refrigerator, the exhaust gas passing through the condenser by the blower for cooling the condenser is exhausted by the exhaust equipment at the environmental test device installation place, like the environmental test device. It can be discharged to the outside of the device installation space, and in that case, as in the case of the environmental test device, the amount of condensed air that should pass through the condenser can be achieved while normal operation of the refrigerator and The amount of dust and heat generated from the surrounding area can be monitored and controlled to an appropriate amount that can suppress leakage from the exhaust box etc. to the space around the equipment, and further, from the motor that drives the member that agitates the gas in the equipment test tank. It is possible to provide an environmental test device capable of discharging dust and heat from the outside of the device installation space together with the exhaust gas that has passed through the condenser.

[Brief description of drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a front view of one embodiment, FIG. 2 is a schematic sectional view taken along line 2-2 of FIG. 1, and FIG. 3 is shown in FIG. FIG. 4 is a schematic front view when a plurality of environmental test devices are connected to an exhaust facility, and FIG. 4 is a front view of another embodiment of the present invention. 1 …… Environmental test equipment 11 …… Test tank 12 …… Machine room 13 …… Condenser 14 …… Propeller fan 15 …… Compressor 16 …… Blower 17 …… Exhaust box 18, 19 …… Motor 20 …… Device Control unit 21 …… Manometer (differential pressure gauge) 3 …… Exhaust equipment 31 …… Exhaust blower 32 …… Main duct 33 …… Branch duct 34 …… Exhaust volume adjusting device (exhaust volume adjusting means) 34a …… Damper 4 …… Environmental test equipment 41 …… Exhaust box 42 …… Motor dust scattering prevention box 42a …… Air intake hole 35 …… Branch duct 36 …… Exhaust volume adjusting device (exhaust volume adjusting means) 36a …… Damper

Claims (2)

[Claims] 1. In an environmental test device equipped with an air-cooled refrigerator, for guiding exhaust gas passing through a condenser by a condenser cooling blower of the refrigerator to an exhaust facility for discharging the environmental test device installation site to the outside. Exhaust box, an exhaust amount adjusting means connected between the exhaust box and the exhaust equipment, attached to the exhaust box, for measuring the difference between the internal pressure of the box and the atmospheric pressure outside the box An environmental test apparatus comprising: a differential pressure gauge, wherein the exhaust gas amount adjusting means can be controlled to maintain a differential pressure value indicated by the differential pressure gauge at a predetermined value. 2. A motor dust-scattering prevention box for enclosing a drive motor of a member for agitating air in a test tank of an environmental testing device and connected to the exhaust box for guiding air around the motor to the exhaust box. The environmental test device according to claim 1.