JPH0469545A - Environmental testing device - Google Patents

Abstract

PURPOSE:To put a refrigerating machine in normal operation by guiding condensed air which is discharged from an air blower for condenser cooling into a box for differential pressure measurement and discharging the condensed air to the outside by an air discharging facility provided to the box. CONSTITUTION:Each environmental testing device 1 is put in operation and a propeller fan 14 and a blower 16 are rotated. Then circumferential air passes through the condenser 13 while cooling it and is discharged into the box 17 from the blower 16. The condensed air discharged into the box 17 is discharged to the outside through a branch duct 33 and a main duct 32 through the operation of an air discharging blower 31 which is common to the device 1. During this period, the difference between the internal pressure in the box 17 and the atmospheric pressure can be observed through a manometer 21 and the opening extent of a dumper 34a in an air capacity adjusting device 34 is so adjusted that the difference pressure is within a predetermined permissible range. Thus, the opening extent of the dumper is adjusted to pass the condensed air through the condenser 13 by a proper amount and the refrigerant in the condenser 13 is condensed into a desired state, thereby putting the refrigerator in stable and normal operation.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is applicable to testing and screening the reliability of various electrical and electronic devices, their parts, and various materials under various temperature and humidity conditions. The present invention relates to an environmental test device for carrying out such tests, and particularly to an environmental test device equipped with an air-cooled refrigerator.

[Prior Art] An environmental test device is generally equipped with a refrigerator to control the temperature inside the test chamber, and the refrigerator is usually an air-cooled refrigerator, and the condenser is used for cooling the condenser. Cooled by a blower.

[Problem to be solved by the invention] However, this type of environmental test device has the following problems.

- Exhaust air from the condenser cooling blower is directly discharged into the space where the environmental test equipment is installed, and the working environment in the space is deteriorated due to the exhaust heat and the rising of surrounding dust.

- When the environment test equipment installation space is a clean room, dust generated from the rotating parts of the blower, etc. is directly scattered into the room, contaminating the room.

(2) The temperature of the space in which the environmental test equipment is installed rises due to exhaust heat from the condenser and blower, and there is a risk that cooling of the condenser will be insufficient in summer or the like, or the air conditioning load on the space will increase.

■ The motor that drives the gas agitation member (usually a fan) in the test chamber is generally exposed on the outer wall of the environmental test equipment, and therefore the heat and dust generated by the motor are scattered around and pollute the surrounding environment. Moreover, if the space where the environmental test equipment is installed is a clean room, it will be contaminated.

As a means to solve the above problem, for example, the condenser cooling blower or the machine room containing the blower is connected to exhaust equipment to exhaust condensed air to the outside, thereby eliminating heat generation and dust generation from the stirring member drive motor. If necessary, it may be possible to release the condensed air to the outside using the exhaust equipment, but
This has the following problem.

In other words, because there are multiple environmental test devices, the exhaust equipment must control the amount of air that passes through the condenser (hereinafter referred to as "condensed air amount") in each environmental test device to ensure normal operation of the refrigerator. If the amount of condensed air cannot be properly exhausted, in other words, the amount of condensed air is too high. If the amount of condensed air is too high due to the exhaust volume of the equipment, there is a problem that when the ambient temperature is low, the refrigerant pressure on the high pressure side of the refrigeration circuit will be low, reducing the refrigeration capacity, and the amount of condensed air will be insufficient. In this case, when the ambient temperature is high, the refrigerant pressure on the high-pressure side of the refrigeration circuit increases, causing trouble. In addition, when the amount of condensed air is insufficient, that is, as mentioned above, when the exhaust volume of the condenser cooling blower is larger than the exhaust volume of the exhaust equipment, the pressure in the exhaust duct in the exhaust equipment increases, and the pressure inside the duct increases. Dust may leak into the environment test equipment installation space through gaps in ducts, and if the space is a clean room, the room becomes contaminated.

In addition, if the amount of condensed air becomes unstable due to unstable exhaust volume of exhaust equipment, the refrigerant pressure on the high pressure side of the refrigeration circuit becomes unstable, and the refrigeration capacity also becomes unstable. There is a problem that the temperature inside the test chamber is not stable, which reduces the reliability of the test, and if the pressure inside the duct of the exhaust equipment increases too much, there is also the problem that dust leaks into the surrounding area as mentioned 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 volume, but in order to accurately measure the wind speed, it is necessary to Straight pipe sections of specified dimensions are required at the top and downwind.
A commutator is also required.

In this way, wind speed measurement requires a special structure, and
Since its measurement is generally difficult, it is not practical to constantly manage the exhaust capacity of exhaust equipment using this method.

Therefore, first of all, the present invention is an environmental test device equipped with an air-cooled refrigerator, in which condensed air from a condenser cooling blower can be discharged through a separately provided exhaust facility,
Moreover, in that case, the amount of condensed air is such that normal operation of the refrigerator can be expected, and at the same time, if dust generated from the blower and its surroundings must be prevented from leaking into the surrounding space, It is an object of the present invention to provide an environmental test device that allows easy monitoring of whether or not the amount is an appropriate amount.

Second, an environmental test device equipped with an air-cooled refrigerator,
The condensed air from the condenser cooling blower can be discharged to the outside of the equipment installation space, and the amount of condensed air can be expected to maintain normal operation of the refrigerator. It is an object of the present invention to provide an environmental test device that can control and discharge an appropriate amount of dust when it is necessary to prevent leakage of dust into the surrounding space.

Thirdly, an environmental test device equipped with an air-cooled refrigerator,
It is possible to discharge condensed air from the condenser cooling blower to the outside of the equipment installation space, and furthermore, the amount of condensed air can be expected to ensure normal operation of the refrigerator and reduce dust generation from the blower and its surrounding areas. It is possible to monitor whether the amount of gas is at an appropriate level to prevent it from leaking into the surrounding space, and in addition, dust generated from the motor that drives the member that stirs the gas in the equipment test chamber is discharged to the outside along with the condensed air. The purpose is to provide an environmental test device with a configuration that allows for

[Means for Solving the Problems] The first object of the present invention is to provide an environmental testing apparatus equipped with an air-cooled refrigerator, in which exhaust air by a blower for cooling a condenser of the refrigerator can be guided in a fixed direction. This is achieved by an environmental testing device characterized by comprising a box for measuring differential pressure, and a differential pressure gauge attached to the box and capable of measuring the difference between the internal pressure of the box and the atmospheric pressure.

Further, the second object of the present invention is achieved by connecting the box to exhaust equipment having an exhaust volume adjusting means.

The third object of the present invention is achieved by including a motor dust scattering prevention box that surrounds a motor that drives a member that stirs the gas in a test tank of an environmental test device and is connected to the differential pressure measurement box. be done.

The condenser cooling blower includes not only a blower placed near the condenser and acting directly on the condenser, but also a blower that guides exhaust air from the blower to the differential pressure measuring box. Sometimes such blowers are also included.

If there are multiple environmental test devices, the exhaust volume adjustment means in the exhaust equipment may be an air volume adjustment damper installed for each environmental test device, and if there is only one environmental test device, the exhaust volume adjustment means for the device may be In addition to an air volume adjustment damper provided for the exhaust system, other means such as changing the rotational speed of the exhaust blower drive motor in the exhaust equipment may also be considered.

[Function] According to the environmental test device of the present invention, condensed air discharged from the condenser cooling blower can be guided into the differential pressure measurement box, and if exhaust equipment is connected to the box, the condensed air can be guided into the differential pressure measurement box. can be discharged to the outside. In that case, it is possible to monitor whether the amount of condensed air is appropriate using the differential pressure gauge.

When exhaust equipment having a displacement adjustment means is connected to the box, the differential pressure gauge is observed and the displacement adjustment means is operated so that the difference between the box internal pressure and the atmospheric pressure is within a predetermined tolerance range. The amount of condensed air can be controlled to an appropriate level and discharged to the outside.

When the motor dust scattering prevention box is provided, not only condensed air but also dust and heat generated from the stirring member drive motor can be discharged to the outside. In this case, by slightly lowering the internal pressure of the box for differential pressure measurement, it is possible to prevent dust from leaking from the box.

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

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

This device 1 includes a test tank 11 that can be opened and closed by a door 11a, and a machine room 12 is located below the test tank 11, and the machine room has a condenser 13 of an air-cooled refrigerator for controlling the temperature inside the test tank. , a propeller fan 14 and a compressor] 5 which act directly on the propeller fan 14 are arranged, and the fan 1 is located at the outlet of the machine room.
A blower (in this example, a multi-blade fan) 16 is arranged to guide the exhaust gas from the air pump 4 to a differential pressure measuring box 17, which will be described later.

The evaporator of the refrigerator and the like are arranged in the air conditioning section within the test tank 11. Although not shown in the drawings, the air conditioning unit is also provided with a heater for temperature control, a humidifier, and the like.

Motors 18 and 19 are arranged on the ceiling of the test chamber 11, and the motors drive air stirring fans (not shown) arranged in the test chamber 1.

A device control unit 20 is provided on the front side of the test chamber 11,
A differential pressure measuring box 17 is provided on the rear side of the test tank (behind the control section) so as to surround the blower 16, and a manometer 21 as a differential pressure gauge is connected to the box. Note that part or all of the water supply means to the humidifier is also arranged in this box.

The upper end of the box 17 is connected to one exhaust facility 3 common to a plurality of environmental test apparatuses 1, as shown in FIG. The exhaust equipment 3 has an exhaust blower 31 at the end,
A branch duct 33 extends from the main duct 32 extending from the blower.
The branch ducts 33 are connected to the upper end of the box 17 via an exhaust volume adjusting device 34. The exhaust volume adjustment device 34 includes a rotatable air volume adjustment damper 34a.

When each environmental test device 1 is operated and the propeller fan 14 and blower 16 are turned, ambient air passes through the condenser 13 to cool it and is discharged from the blower 16 into the box 17. The condensed air discharged into the box 17 is discharged to the outside through the technical duct 33 and the main duct 32 by operation of the exhaust blower 31 common to each environmental test apparatus 1 .

During this time, the difference between the internal pressure of the box 17 and the atmospheric pressure can be observed by the manometer 2I, and the air volume adjustment device 34 is adjusted so that the differential pressure is within a predetermined tolerance range (for example, within ±0.3 mmAq). The opening degree of the damper 34a 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 to a desired state, and the refrigerator is operated stably and normally. As a result, the temperature inside the test chamber 11 is more accurately controlled and stabilized, and the reliability of the test apparatus 1 is improved.

In addition, the condensed air discharged from the blower 16 is
The condensed air around the test device I is discharged to the outside by the exhaust blower 31 through the box 17, the branch duct 33, and the main duct 32 without being scattered around the test device I. There is no fear that the heat from the room will be directly exhausted or that surrounding dust will be raised and the surrounding environment will be deteriorated.

When the equipment installation space is a clean room or the like where it is necessary to prevent dust contamination, the differential pressure is set to, for example, -0.3 to - to prevent dust from leaking from the machine room 12, blower 6, etc. Approximately 0.5 mmAq, box 1
7. Maintain the pressure inside.

FIG. 4 shows another embodiment, and this environmental test device 4
In this case, a slightly taller box 41 is provided in place of the box 17 in the embodiment shown in FIG. It is covered with a shatterproof box 42, which is connected to box 4I. Furthermore, a branch duct 35 is used in place of the exhaust duct 33 in the embodiment of FIG. It is connected to the side surface of the upper end of the box 41 via. The displacement adjustment device 36 has an opening degree g
m* possible damper 36a is included. Also, motor 1
A box 42 surrounding 8.19 is provided with an outside air intake hole 42a at a position above each motor. Except for the points explained above, the configuration is the same as the environmental test apparatus 1 shown in FIG. 1.

According to this environmental test device 4, condensed air discharged from the blower 16 is sucked into the branch pipe 35 through the box 41, and from there passes through the main duct 32 and is discharged to the outside by the common exhaust blower 31. Additionally, along with this, air within the box 42 surrounding the motors 18, 19 is also sucked into the branch pipe 35 and discharged to the outside.

During operation of the environmental test device 4, the manometer 21 connected to the box 41 is observed, and the internal pressure of the box 41 is slightly lower than the atmospheric pressure (if the differential pressure is, for example, -0.3 to -).
By adjusting the opening degree of the damper 36a (approximately 0.5 mmAq), the amount of condensed air passing through the condenser 13 is maintained at an appropriate amount for normal operation of the refrigerator. The machine room 12 is maintained at a depressurized state.
Dust generated from the blower 16, etc. and the dust generated from the motor 18, 19 can be discharged to the outside by the exhaust blower 31 via the branch pipe 35 and the main duct 32 without leaking to the surroundings. Reliability is improved, and if the working environment around the environmental test equipment deteriorates or the surroundings are a clean room, the risk of contamination of the room is reduced accordingly.

In addition, in the case of the environmental test device 4, since the structure allows the dust generated from the motor 18.19 to be discharged to the outside together with the condensed air, the dust generated from the motor 18.19 is separately discharged to the outside. There is also the advantage that the overall configuration including the exhaust means is extremely simplified compared to the case where a means for exhausting is provided.

Box 17 for differential pressure measurement in environmental test apparatus 1.4.
If 41 is formed so that the wind speed inside these boxes is sufficiently small, the influence on static pressure will be reduced, so the reference value for determining whether the difference between the air pressure inside the box and the atmospheric pressure is within the permissible range. may be set to "0", and if the wind speed cannot be made sufficiently small, the reference value may be slightly shifted to correct this.

It should be noted that the present invention can be implemented in various modes other than the above-mentioned embodiments. For example, in the device 1.4, when exhaust air from the propeller fan 14 of the refrigerator is directly directed to the back of the device,
A differential pressure measurement box is provided there, and the blower 1
It is also possible to omit 6. Even in the embodiment described above, the blower 16 can be omitted. However, as in the previous embodiment, the direction of the exhaust air from the propeller fan 14 is changed and the condensed air is sent from the machine room 12 to the box 17.
41, it is desirable to provide the blower 16 to lighten the burden on the exhaust equipment 3 and facilitate its design.

〔Effect of the invention〕

According to the present invention, it is possible to provide an environmental test apparatus equipped with an air-cooled refrigerator having the following advantages.

■ The condensed air from the refrigerator condenser cooling blower is discharged outside the equipment installation space using exhaust equipment to prevent direct waste heat to the surrounding area and the raising of surrounding dust due to condensed air discharged from the condenser cooling blower of the refrigerator. In that case, the amount of condensed air can be expected to allow normal operation of the refrigerator, and at the same time, the leakage of dust from the blower and its surroundings into the surrounding space can be prevented. If necessary, it can be easily monitored to see if it is an appropriate amount.

■ When the differential pressure measurement box is connected to exhaust equipment that has a displacement adjustment means, the condensed air from the condenser cooling blower is exhausted to the outside by the exhaust equipment, and the condensed air is discharged to the surrounding area. It can prevent direct exhaust heat and dust from rising, and also reduce the amount of condensed air.
If normal operation of the refrigerator can be expected, and at the same time dust from the blower and its surroundings must be prevented from leaking into the surrounding space, the amount should be controlled to an appropriate level. Can be discharged.

■ When a motor dust scattering prevention box is installed, the amount of condensed air can be expected to operate the refrigerator normally, and also drive the condenser cooling blower, its surrounding areas, and the parts that stir the gas in the equipment test chamber. It is possible to monitor whether the amount of dust emitted from the motor is adequate to prevent it from leaking into the surrounding space, and the dust emitted from the motor can also be discharged to the outside along with the condensed air, so that the surrounding space is in a clean room, etc. In the case of a space that requires prevention of contamination by dust, contamination of the space can be prevented to that extent.

[BRIEF DESCRIPTION OF THE DRAWINGS] The drawings show an embodiment of the present invention, and FIG. 1 is a front view of one embodiment, FIG. 2 is a schematic sectional view taken along line 2-2 in FIG. 1, and FIG. 1 is a schematic front view of a case in which a plurality of the environmental test apparatuses shown in FIG. 1 are connected to exhaust equipment, and FIG. 4 is a front view of another embodiment of the present invention. 1...Environmental test device 11...Test tank 12...Machine room 13...Condenser 14...Propeller fan 15...Compressor 16...Blower 17...For differential pressure measurement Boxes 18, 19...Motor 20...Device control unit 21...Manometer 3...Exhaust equipment 31...Exhaust blower 32...Main duct 33...Technical duct 34...Displacement amount Adjustment device 4a...Damper...Environmental test device 1...Differential pressure measurement box 2...Motor dust scattering prevention box 2a...Air intake hole 5...Branch duct 6...Exhaust Quantity adjusting device 6a...Damper Applicant Tabai Espec Co., Ltd. Figure 12...Machine room 13...Condenser 14...Propeller fan 15...Compressor 34a...Damba

Claims (3)

[Claims] (1) In an environmental test device equipped with an air-cooled refrigerator, there is provided a box for measuring differential pressure that can guide exhaust gas from a condenser cooling blower of the refrigerator in a fixed direction, and a box for measuring differential pressure that is attached to the box; An environmental test device characterized by being equipped with a differential pressure gauge that can measure the difference between internal pressure and atmospheric pressure. (2) The environmental test apparatus according to claim 1, wherein the box is connected to exhaust equipment having an exhaust volume adjusting means. (3) The environmental test according to claim 1 or 2, further comprising a motor dust scattering prevention box that surrounds a motor that drives a member that stirs the gas in the test chamber of the environmental test device and is connected to the differential pressure measurement box. Device.