JPH04135648A - Pressure regulator for thermo-hygrostat device - Google Patents

Abstract

PURPOSE:To prevent the discharge of the high-temp. steam to the outside of a test chamber by mounting a rubber plate and heat radiating cover into the pressure regulating hole of the pressure regulator of the thermo-hygrostat device which supplies the air controlled in temp. and humidity by a refrigerator, heater and humidifier into the test chamber. CONSTITUTION:The pressure regulating hole 9 discharges the air in the test chamber 1 and sucks the outdoor air in order to adjust the difference between the air pressure in the test chamber 1 and external outside air pressure. The rubber plate 23 is mounted by a press plate 24 to the out-of-the chamber side of a resin pipe 22 and the heat radiating cover 25 is provided on the out-of-the chamber side of the pressure regulating hole 9. The high-temp. steam in the test chamber 1 passes the resin pipe 22 and pushes the rubber plate 23 to open so as to be discharged to the outside of the chamber when the pressure in the test chamber 1 rises at the time of a high temp. and high humidity. The discharged high-temp. steam rises to the upper part of the heat radiating cover 25 and condenses by making heat exchange with the heat radiating cover 25. The condensed steam is drained from a drain hole 27 in the lower part of the heat radiating cover 25. The outdoor is sucked from a small-diameter hole 28 in the central part of the rubber plate 23 and regulates the pressure in the test chamber 1 when the pressure in the test chamber 1 drops at the time of a low temp. The rubber plate 23 comes into tight contact with a heat insulating panel 21 to prevent the more than required introduction of the outdoor air at the time of a low temp.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a pressure regulating device for a test chamber of a constant temperature and humidity device.

[Conventional technology]

Conventional devices of this type are intended for pressure adjustment in conditions where the indoor temperature is low, such as in freezers and refrigerators.When a pressure adjustment device with a pressure adjustment mechanism is installed in a constant temperature and humidity device, Under conditions of high temperature and humidity, high-temperature steam generated by the humidifier was discharged outside the test room from the pressure regulator when the indoor pressure became positive.

[Problem to be solved by the invention]

Conventional pressure regulating devices such as freezers and refrigerators made of prefabricated panels are limited to use in low-temperature ranges, so when the indoor temperature is high and humid, high-temperature steam is discharged, making it unsafe. was not considered.

The present invention aims to prevent the discharge of high-temperature steam under high-temperature conditions.

[Means to solve the problem]

In order to achieve the above objective, a rubber plate and a heat radiation cover are attached to the pressure adjustment hole, and the high temperature steam discharged from the test chamber is cooled and condensed by natural heat radiation, water cooling, air cooling, etc. within the heat radiation cover, and the heat is radiated. The drain hole provided at the bottom of the cover drains water into the machine room water receiver to prevent high-temperature steam from being discharged outside the test room.

Furthermore, in order to reduce frost formation on the evaporator due to outside air entering through the pressure adjustment hole at low temperatures in the test room, a small diameter hole is provided in the rubber plate, and when the room is under negative pressure at low temperatures, the pressure is regulated through this small diameter hole to minimize the outside air as much as possible. The aim is to reduce the amount of ice that enters the evaporator and reduce frost formation on the evaporator.

[Effect]

When the test room is hot and humid, the pressure inside the room becomes positive.

The rubber plate is pushed open and high temperature steam is discharged into the heat dissipation cover. The high temperature steam inside the heat dissipation cover is cooled by the outside air on the wall or top surface of the heat dissipation cover, or by circulating water if it is a water-cooled type, or by circulating air if it is air-cooled, and it becomes possible to condense when the temperature falls below the dew point temperature.

When the temperature in the test room is low, the pressure inside the test room becomes negative, and by tightly adhering the rubber plate to the heat insulating panel, it is possible to prevent more outside air from entering than necessary.

〔Example〕

An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

FIG. 1 shows a schematic cross-sectional view of a constant temperature and humidity device. A constant temperature and humidity device is mainly a blower5. Heater 6° Evaporator 7. Humidifier8. and compressor 3. It consists of a refrigeration cycle consisting of a condenser 4, and air whose temperature and humidity are controlled by the condenser 4 is supplied and circulated by a blower 4 to a test chamber 1, which is an air-conditioned area surrounded by a heat insulating material.

A pressure adjustment hole 9 is provided at the bottom of the heat insulating panel of the indoor unit 10 in order to adjust the pressure fluctuation due to changes in temperature and humidity in the test room and the pressure fluctuation when the door 2 is opened and closed. This prevents deformation and damage of the insulation panel and breakage of the insulation panel seal.

FIG. 2 shows a detailed cross-sectional view of the pressure adjustment hole 9 portion.

The pressure adjustment hole 9 of the present invention has a resin pipe 22 in the heat insulation panel 21.
is embedded, and the hole formed by the resin pipe 22 is used to exhaust the air in the test room and take in the outside air in order to adjust the difference between the pressure inside the test room and the outside air pressure.

In the constant temperature and humidity device, in order to conduct an environmental test under high temperature and high humidity conditions, the pure water supplied by the humidifier 8 in Fig. 1 is heated and evaporated by a humidifying heater (not shown), and the generated high temperature is The steam creates high temperature and high humidity conditions such as 80° C./95% RH.

The volume increases as high-temperature steam is generated. Therefore, the atmospheric pressure in the test chamber increases, and the pressure is adjusted by exhausting room air and high-temperature steam through the pressure adjustment hole 9.

The pressure adjustment hole 9 in the present invention is provided by attaching a rubber plate 23 to the holding plate 24 on the outdoor side of the resin pipe 22 shown in FIG. Furthermore, a heat radiation cover 25 is provided on the outside of the pressure adjustment hole 9.

When the pressure in the test room increases during high temperature and high humidity, the high temperature steam in the test room passes through the resin pipe 22, pushes open the rubber plate 23 due to the pressure increase, and is exhausted to the outside through the gap between the rubber plate 23 and the insulation panel 21. . The exhausted high-temperature steam is transferred to the heat radiation cover 2.
5 rises to the top of the heat dissipation cover 25, exchanges heat with the heat dissipation cover 25, and is cooled below the dew point temperature to form dew condensation.
The water is drained from the drain hole 27 at the bottom of the machine room to the machine room water receiver 26.

When the pressure in the test chamber drops at low temperatures, outside air is taken in through the small diameter hole 28 in the center of the rubber plate 23 to adjust the pressure in the test chamber. At low temperatures, the rubber plate 23 is in close contact with the heat insulating panel 21, and by preventing more than necessary outside air from being introduced, an increase in the amount of frost on the steamer is prevented.

When the pressure suddenly increases when closing the test room door, close the rubber plate 23.
By arranging the drain hole 27 of the heat radiation cover 25 in a straight line, the discharged indoor air can be easily exhausted.

In FIG. 3, the pressure adjustment hole 9 in FIG. 2 is configured so that steam is condensed by water cooling or forced air cooling using a water-cooled heat exchanger 29 or a blower 30. This allows the heat dissipation cover to be made smaller.

〔Effect of the invention〕

According to the present invention, it is possible to prevent high-temperature steam from being discharged outside the test room, thereby preventing disturbances in the air temperature at the test room installation location.
This is effective in preventing dew condensation from occurring near the pressure adjustment hole.

Furthermore, when the temperature in the test room is low, it is possible to reduce the amount of outside air entering through the pressure adjustment hole, thereby reducing frost formation on the evaporator and extending the defrosting cycle.

[Brief explanation of the drawing]

FIG. 1 is a diagram showing an outline of the constant temperature and humidity device of the present invention, FIG. 2 is a diagram showing details of the pressure adjustment hole portion according to the invention, and FIG. 3 is a diagram showing another example of the pressure adjustment hole portion. be. 1...Testing room, 2...Door, 3...Compressor, 4...
・Condenser, 5...Blower, 6...Heater, 7...
Evaporator, 8... Humidifier, 9... Pressure adjustment hole, 10.
...Indoor unit, 23...Rubber plate, 25...Radiation cover

Claims (1)

[Scope of Claims] 1. The test chamber is equipped with a refrigerator consisting of a refrigeration cycle in which a compressor, a condenser, a pressure reduction mechanism, and an evaporator are sequentially connected, and a blower that supplies air whose temperature and humidity are controlled by a heater and a humidifier. In the constant temperature and humidity equipment supplied to the test chamber, a rubber plate and a heat radiation cover are attached to the pressure adjustment hole provided to adjust the atmospheric pressure in the test chamber, and a rubber plate and a heat dissipation cover are attached to the pressure adjustment hole to adjust the air pressure inside the test chamber. High-temperature steam is cooled with a heat dissipation cover, condensed, and drained to prevent high-temperature steam from being discharged outside the test room.When the test room is low in temperature, a rubber plate prevents outside air from entering and reduces frost formation on the evaporator. A pressure regulating device for a constant temperature and humidity device. 2. A pressure regulating device for a constant temperature and humidity apparatus according to claim 1, wherein the heat dissipation cover attached to the pressure regulation hole is a water-cooled heat exchanger or a forced air-cooled heat dissipation cover to which a heat dissipation fan is attached.