JPH03262940A - Constant temperature and humidity chamber - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] (Summary) Regarding a constant temperature and humidity tank that is set to a constant temperature and humidity state and includes a tank body in which an opening is formed, and a screen that closes the opening, the tank when the door is opened and closed. The purpose of preventing dew condensation on the inner wall surface of the main body is to provide a heat generating means on the inner wall of the tank main body in a constant temperature and humidity chamber as described above, and a heat generating control means for operating the heat generating means in accordance with the opening/closing operation of the groove. It is characterized by having the following.

(Industrial Application Field) The present invention relates to a constant temperature and humidity chamber, and particularly to a constant temperature and humidity chamber, which is set to a constant temperature and humidity state and includes a chamber body having an opening formed therein, and a door that closes the opening. Regarding constant temperature and humidity chambers.

(Prior Art) As a conventional constant temperature and humidity chamber, there is one shown in FIG. 3, for example. As shown in the figure, the constant temperature and humidity chamber contains the sample 2 inside the chamber body 12.
0 is placed, the door 13 is closed, and the inside of the tank body 12 is set to a desired temperature and humidity using a temperature control section (not shown) and a temperature control section (not shown), and a constant temperature and humidity state, that is, the temperature is maintained. This is to test the changes over time and fatigue of the sample while maintaining humidity at all times.

[Problem to be solved by the invention]

By the way, in conventional constant temperature and humidity chambers, when the inside of the chamber body 12 is set to high temperature and high humidity, the door is closed when a sample is put into the chamber body 12 or when a sample 20 placed in the chamber body 12 is taken out. Every time 13 is opened, the air inside the tank body 12 and the outside air come into contact with each other, and the air inside the tank body 12 and the outside air are exchanged.
The temperature of the inner wall surface drops rapidly. Then, even if the door 13 is closed again and the inside of the tank main body 12 is set to high temperature and high humidity, the tank main body 1
2. There will be a portion of the inner wall surface where the temperature does not return to the set temperature, and the air around that wall surface will be cooled and the humidity will reach a saturated state, causing dew condensation. In particular, there is a possibility that dew condensation generated on the upper wall of the tank body 12 becomes water droplets that fall onto the sample and adversely affect the sample.

For this reason, in the past, after opening and closing the folding screen 13 to prevent condensation, the humidity control section was manually controlled so that the inner wall of the tank body 12 did not humidify until the set temperature was reached, or until the set temperature and humidity were reached. It was necessary to wait for a long time (for example, 20 to 30 minutes) for the test, and the test operation was troublesome and time-consuming.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a constant temperature and humidity tank that can prevent dew condensation on the inner wall surface of the tank body when the operation door is opened and closed.

[Means to solve the problem]

Means for solving the above problems in the present invention is as shown in FIG. In a constant temperature and humidity chamber equipped with a door 3, a heat generation means 4 is provided on the inner wall of the tank body 2, and a heat generation control means 5 is provided that operates the heat generation means 4 in response to the opening/closing operation of the above 1'$3. That's true.

(Function) According to the present invention, the heat generation control means 5 operates the heat generation means 4 provided on the inner wall of the tank body 2 in response to the opening/closing operation of the door 3. For this reason, the heat generation control means 5 operates the heat generation means 4 when the door 3 is opened when the inside of the tank body 2 is in a high temperature and high humidity state.
If it is operated for a certain period of time after being closed or until the temperature of the inner wall of the tank body 2 reaches the initial set temperature, the temperature of the inner wall of the tank main body 2 will not drop even when the door 3 is opened or closed, and the temperature of the inner wall of the tank body 2 will increase. It is possible to prevent the occurrence of dew condensation.

(Example) Hereinafter, an example of a constant temperature and humidity chamber according to the present invention will be described based on the drawings. In the constant temperature and humidity chamber of this embodiment, the same components as those of the conventional one shown in FIG. 3 will be described with the same reference numerals.

In this embodiment, as shown in FIG. 2, nichrome wire sheathed heaters 31a to 31d covered with stainless steel tubes as heat generating means are embedded in the soil wall and both side walls of the tank body 12, and the door 13 is attached to the tank body 12. A heat generation control circuit 32 as a heat generation control means is provided at a hinge portion that is connected so as to be openable and closable. And nichrome wire sheathed heaters 31a to 31
d is connected so that current is supplied from a DC power source 35 via a heat generation control circuit 32. Heat generation control circuit 3
2 detects the open state and closed state of the door 13 in conjunction with the opening/closing operation, corresponding to the ON state and OFF state, respectively.
An on/off switch 33 that enables current to be supplied from the DC power supply 35 to the nichrome wire sheathed heaters 31a to 31d when the on/off switch 113 is open and on, and the on/off switch 33 is on.
A timer circuit 34 is configured to supply current from a DC power supply 35 to the nichrome wire sheathed heaters 31a to 31d for a preset period of time upon receiving a command when the state changes from the OFF state to the OFF state.

In such a constant temperature and humidity chamber, if a sample is placed in the chamber body 12 and the door 13 is closed, and the high temperature and humidity condition remains for a long time, the on/off switch 33 will switch between the nichrome wire sheathed heaters 31a and 31a. 31d is not working.

On the other hand, when J'l 13 is opened once to take out a sample, for example, the open/close switch 33 is turned on and current is supplied from the DC power supply 35 to the nichrome wire sheathed heaters 31a to 31d. While M% 13 is open, the open/close switch 33 is in the ON state, so current is supplied from the DC power supply 35 and the nichrome wire sheathed heaters 31a to 31d generate heat. When the door 13 is closed, the open/close switch 33 is turned off and no current is supplied through the open/close switch 33, but the timer circuit 34 is activated as the open/close switch 33 changes from the ON state to the OFF state. However, current is supplied from the DC power supply 35 to the nichrome wire sheathed heaters 31a to 31d for a certain period of time. For this reason, the inner wall surface of the tank body 12 is heated by the nichrome wire sheathed heaters 31a to 31d for a certain period of time when the fi 13 is opened and closed, so that the temperature of the inner wall surface of the tank body 12 does not drop and dew condensation occurs on the wall surface. There is no water droplet falling due to condensation on the upper wall.

Therefore, according to this embodiment, even if the door 13 is opened or closed when the inside of the tank body 12 is set to high temperature and high humidity, no condensation occurs on the inner wall surface of the tank body 12, and the inner wall of the tank body 12 reaches the set temperature. You can control it manually so that it does not humidify until it reaches
Further, there is no need to wait for a long time until the set temperature and humidity are reached, and the test operation can be performed easily and in a short time.

In this embodiment, the nichrome wire sheathed heaters 31a to 31d as heat generating means are embedded in the top and side surfaces of the inner wall of the tank body 12, but in the present invention, heat is generated only on the top surface of the inner wall where water droplets fall when condensation occurs. A means may be provided, or a portion where dew condensation is likely to occur may be appropriately selected and a heat generating means may be provided at that portion. Further, in this embodiment, a nichrome wire sheathed heater 31a is used as a heat generating means.
~31d, the heat is generated until a certain period of time has passed after the door is closed, but in the present invention, of course, other heat generating means may be used, and the heat generated after the door is closed is kept at the initial set temperature. Alternatively, the temperature may be controlled until the temperature reaches

(Effects of the Invention) As explained above, according to the present invention, even if the inside of the tank body is set to a high temperature and the folding screen is opened or closed, condensation does not occur on the wall surface inside the tank body, and the inner wall of the tank body There is no need to manually control the humidification so that the humidity does not reach the temperature, or to wait for a long time until the set temperature and humidity are reached, making the test operation simple and quick.

[Brief explanation of drawings]

FIG. 1 is a diagram showing the principle of the present invention, FIG. 2 is a diagram showing the main parts of an embodiment of a constant temperature and humidity chamber according to the present invention, and FIG. 3 is a diagram showing a conventional example. 1.11... Opening 2.12... Tank body 3.13... Door 4.31a-31d... Nichrome wire sheathed heater as heating means)

Claims (1)

[Claims] In a constant temperature and humidity tank that is set to a constant temperature and humidity state and includes a tank body (2) in which an opening (1) is formed, and a door (3) that closes the opening (1), the tank body (2) A heat generation means (4) is provided on the inner wall, and a heat generation control means (5) that operates the heat generation means (4) in accordance with the opening/closing operation of the door (3).
) A constant temperature and humidity chamber.