JPH05231759A - Method of cooling heat generating load in thermo-hygrostat and thermo-hygrostat - Google Patents

Abstract

PURPOSE:To perform an efficient cooling of a heat generating load with an already existing freezing power even in the case that the heat generating load having a high heat generating amount is placed within a thermo-hygrostat. CONSTITUTION:The temperature within a thermo-hygrostat 8 having a heat generating load with a high heat generating amount is detected by a temperature sensor 5, a solenoid valve 3 is kept at its opened state together with a cooling operation performed by a freezer until a sufficient cooling is attained in the case that a micro-computer 4 judges it difficult that the heat generating load is cooled by an existing freezer in response to a variation in the sensing temperature. With such an arrangement, dry air from a compressor 1 is fed into the thermo-hygrostat 8 through a water separator 2, a valve 3 and a dry air supplying pipe 9 as the cooling medium.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for cooling a heat generation load in a constant temperature and humidity apparatus, which can efficiently cool the heat generation load even when a heat generation load having a large heat generation amount is placed in the constant temperature and humidity chamber. Relates to a constant temperature and humidity device capable of efficiently cooling a heat generation load having a large heat generation amount by using an existing refrigeration capacity.

[0002]

2. Description of the Related Art Generally, in a constant temperature and constant humidity apparatus, the ambient atmosphere condition is controlled as desired with respect to an object to be tested (various electric devices, semiconductor elements, etc.) placed inside the constant temperature and constant humidity tank. Various tests are performed in this state, but when placing the test object from the high temperature atmosphere state to the low temperature atmosphere state, if the internal heat generation of the test object itself is small, use a constant temperature and humidity device. In terms of the refrigerating capacity of, there is no particular problem. However, depending on the object to be tested, if the internal heat generation is large and the refrigerating capacity cannot be ignored, it is necessary to equip a refrigerator having a large refrigerating capacity. In this way, even if a refrigerator with a large refrigerating capacity is provided in advance to deal with the case where the internal heat generation in the test object is large, the inside of the constant temperature and humidity chamber is limited to the refrigerator. Since the temperature of the refrigerant gas is cooled and therefore the refrigerant gas suctioned into the refrigerator is unavoidably increased, it is actually considered to equip the refrigerator with a suction cooler in order to suppress the temperature increase of the refrigerant gas. In addition, as a literature regarding a refrigeration cycle equipped with a suction cooler,
For example, Japanese Patent Laid-Open No. 1-23061 can be cited.

[0003]

As described above, the constant temperature and humidity apparatus has hitherto been an object to be tested (hereinafter,
A refrigerator with a large refrigerating capacity is provided in advance in order to deal with the case where the internal heat generation (called heat generation load) is large. As a result, a constant temperature and humidity device is provided. Not only is it unavoidable to become larger, but in terms of power consumption
The reality is that running costs cannot be ignored.

A first object of the present invention is to efficiently use the existing refrigerating capacity even if a large heat generating load is placed in the constant temperature and humidity chamber without increasing the refrigerating capacity. The present invention provides a method for cooling a heat generation load in a constant temperature and constant humidity apparatus that can be effectively cooled. The second object of the present invention is to
It is intended to provide a constant temperature and humidity apparatus having a configuration suitable for carrying out such a heat load cooling method.

[0005]

The first purpose is to sufficiently cool the heat generation load placed inside the constant temperature and humidity chamber in the atmosphere of the set low temperature state rather than the high temperature state by using the existing refrigerating capacity. This is accomplished by introducing pressurized dry air from the outside as an auxiliary cooling medium into the constant temperature and constant humidity chamber until it is obtained. The second object is also to provide a pressurized dry air generating and supplying means provided outside.
A dry air supply pipe for introducing the pressurized dry air from the pressurized dry air generating and supplying means into the constant temperature and humidity chamber, and an open / closed state provided under the control of the overall collective control means, provided on the outside of the dry air supply pipe. This is achieved by equipping an existing constant temperature and humidity device with a controlled solenoid valve or a flow rate control valve.

[0006]

[Function] In a constant temperature and humidity apparatus, in general, the temperature and humidity inside the constant temperature and humidity chamber are directly and indirectly measured while the internal pressure of the constant temperature and humidity chamber made of a heat insulating material is made equal to the external atmospheric pressure by the pressure equalizing pipe. However, it is possible to control the temperature and humidity to be the set temperature and humidity evenly under the control of the overall collective control means based on the temperature and humidity. When the heating load is placed in an atmosphere of a set low temperature state from a high temperature state, dry air pressurized from the outside is controlled by the overall batch control means until the existing cooling capacity is sufficient to cool the auxiliary cooling medium. If it is supplied as, the heat generation load can be cooled to a sufficiently set low temperature state by the existing refrigerating capacity.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to FIG. First, the constitution of the thermo-hygrostat according to the present invention will be explained. FIG. 1 shows the constitution of the main part in one example thereof. In this case, regarding the temperature and humidity inside the constant temperature and humidity chamber 8, the sensor signals from the temperature sensor (dry-bulb temperature sensor and wet-bulb temperature sensor) 5 provided inside the constant-temperature and humidity chamber 8 are used as a micro controller as a whole collective control means. Although it is possible to detect directly and indirectly by processing by the computer 4, the microcomputer 4 controls the temperature based on the detected temperature and humidity.
By executing the humidity control program and controlling the temperature controller 7 and the humidifier (not shown), the temperature and humidity inside the constant temperature and humidity chamber 8 are controlled to be the set temperature and the set humidity. Is becoming At that time, the inside of the constant temperature and humidity chamber 8 is circulated so as to be agitated by the blower 6, so that the temperature and humidity atmosphere inside the constant temperature and humidity chamber 8 does not become uneven. is there.

Now, the constant temperature and constant humidity tank 8 constructed as described above
On the other hand, in order to carry out the method for cooling the heat load according to the present invention, the pressurized dry air supply means is provided outside. The pressurized dry air supply means in this example is
As shown in the figure, it is composed of a compressor 1 and a water separator (having a pressure reducing function) 2. The pressurized air from the compressor 1 is water-removed by the water separator 2 and can be supplied to the inside of the constant temperature and humidity chamber 8 via the dry air supply pipe 9, but the supply / stop of the supply is dry air supply. It depends on the open / close state of the solenoid valve 3 provided in the middle of the pipe 9. When the microcomputer 4 determines that the heat load inside the constant temperature and humidity chamber 8 is larger than the above, the solenoid valve 3 is controlled to be opened for a necessary period. The solenoid valve 3 can also be replaced with a flow control valve having a pressure reducing function in some cases.

Here, apart from humidity control, a heating load having a large amount of heat generated by itself is placed inside the constant temperature and humidity chamber 8, and the heating load is cooled from a high temperature state to a set low temperature state. In that case, the temperature control operation in the example will be described below. That is, while the preset temperature is set to the microcomputer 4 from outside, the heat load is cooled by the existing refrigerating capacity of the constant temperature and constant humidity device. The change in temperature is monitored by the microcomputer 4. With this monitoring, if the heat load is large and the existing refrigerating capacity cannot be used to cool at a sufficient rate
When it is determined that the refrigerator is in the overloaded state, the solenoid valve 3 is opened in parallel with the cooling by the refrigerator until it can be sufficiently cooled with the existing refrigerating capacity. It is intended to introduce pressurized dry air as an auxiliary cooling medium into the constant temperature and humidity chamber. As a result, the internal temperature of the constant temperature and humidity chamber 8 is gradually lowered, but when the temperature nears the set low temperature, the solenoid valve 3 is closed and only the cooling by the refrigerator reaches the set low temperature. It will be done until it is reached. When the dry air is introduced, since the dry air is supplied to the front side of the temperature controller 7, the fine temperature can be controlled, while the moisture is removed from the dry air itself, so the temperature controller The deterioration of the cooling capacity due to the frost on 7 is prevented.

[0010]

As described above, according to the first aspect of the present invention, the existing refrigeration system can be used even if a large heat generation load is placed in the constant temperature and humidity chamber without increasing the refrigeration capacity. A heat generation load cooling method capable of efficiently cooling the heat generation load with capability, and in the case of claim 2, a constant temperature and humidity device having a configuration suitable for implementing such a heat generation load cooling method. Is obtained.

[Brief description of drawings]

FIG. 1 is a diagram showing a main configuration of an example of a constant temperature and constant humidity apparatus according to the present invention.

[Explanation of symbols]

1 ... Compressor, 2 ... Water separator, 3 ... Solenoid valve, 4 ... Microcomputer, 5 ... Temperature sensor, 6 ... Blower, 7 ... Temperature controller, 8 ... Constant temperature and humidity chamber, 9 ... Dry air supply pipe

Claims (2)

[Claims] 1. The temperature and humidity inside the constant temperature and humidity chamber are directly and indirectly detected while the internal pressure of the constant temperature and humidity chamber made of a heat insulating material is made equal to the external atmospheric pressure by a pressure equalizing tube. A method for cooling a heat generation load in a constant temperature and constant humidity apparatus, which is capable of controlling an internal atmosphere state to be a set temperature and humidity evenly under the control of the overall collective control means based on the temperature and humidity. When placing the heat generation load placed inside the tank in the atmosphere of the set low temperature state from the high temperature state, until the sufficient cooling can be achieved with the existing refrigeration capacity, the dry air pressurized from the outside serves as the auxiliary cooling medium. A heating load cooling method for a constant temperature and humidity device, which is adapted to be introduced into a constant temperature and humidity chamber. 2. The temperature and humidity inside the constant temperature and humidity chamber are directly and indirectly detected while the internal pressure of the constant temperature and humidity chamber made of a heat insulating material is made equal to the external atmospheric pressure by a pressure equalizing tube. A constant temperature and humidity device capable of controlling the internal atmosphere condition to a set temperature and humidity evenly under the control of the overall collective control means based on the temperature and humidity, and pressurizing dry air provided outside. Generating and supplying means,
A dry air supply pipe for introducing pressurized dry air from the pressurized dry air supply means into the constant temperature and humidity chamber, and an open / closed state provided under the control of the overall collective control means, provided on the outside of the dry air supply pipe A constant temperature and humidity device equipped with a solenoid valve or a flow control valve.