JPS6385339A - Constant-temperature sustaining apparatus for measuring temperature of disposable body warmer - Google Patents

Abstract

PURPOSE:To perform a temp. characteristic test in a windless state according to a natural convection system, by arranging a cooling jacket to the upper inner surface part of a tank while arranging an electric heater to the bottom surface part thereof. CONSTITUTION:A body warmer 12 is suspended in opposed relation to the front surface of a JIS warmer 10. When a thermostatic tank (a) is operated to set the temp. thereof to 20+ or -1 deg. and the warmer 10 is operated to set the temp. to 30 deg.C, the hot water in a constant-temp. water bath C is recirculated through a pump 14 to hold the surface temp. of the heating part of the warmer 10 to 30 deg.C. Then, a temp. sensor 8 is operated and, when the temp. in the thermostatic tank (a) rises to temp. of more than 20 deg.C, a temp. regulator 9 is operated to drive a motor 4 and a freezer 3 and cold air is discharged from a cooling jacket 1. When the temp. in the thermostatic tank (a) lowers to less than 20 deg.C, an electric heater 7 is turned ON and heat is radiated from the bottom surface part of the tank (a). The heat generating temp. detected by the temp. sensor 13 mounted to the back surface of the body warmer 12 and the atmospheric temp. in the tank (a) detected by the temp. sensor 8 are recorded on a temp. recorder (b).

Description

Detailed Description of the Invention (Field of Industrial Application) The present invention provides a test heater part for testing the temperature characteristics of disposable pots, which has become a designated item in the 1st Wood Industry Standard (JIS 54100). (1) Ambient temperature 5±i"c or room temperature 20±i"c, (2) Ambient humidity 55-70%, (3)
This relates to the field of constant temperature sustaining devices for temperature measurements such as disposable thermometers, which must be placed under conditions of no wind (0.5 m/s or less).

(Prior technology) Conventionally, as a device for measuring the temperature of disposable thermometers, a large constant temperature room was constructed and a fan (@Kanki) was used to reduce the temperature deviation in each part of the room. When the fan rotates, the air in the room becomes turbulent and the wind speed is high, which adversely affects indoor measurements and does not meet the temperature characteristics test standards. Furthermore, as people come in and out of large rooms, their body heat radiates out and changes the indoor temperature distribution, which has the disadvantage of not meeting the above-mentioned temperature characteristic test standards. Problems to be Solved) The present invention provides a simple constant temperature bath for temperature measurement that has enough space to accommodate only the heating device that constitutes the JIS heating device, without using any circulator such as a fan. ,
In order to maintain the temperature distribution accuracy of each part within the constant temperature chamber within ±1°C, a cooling jacket connected to the refrigerator is installed on the top of the constant temperature chamber, and an electric heater is installed on the bottom. A temperature sensor is installed inside the tank to maintain a constant temperature condition by lowering the temperature inside the tank via a cooling jacket, and raising the temperature inside the tank using an electric heater if the temperature drops too low. This led to the development of a constant temperature chamber that is controlled through a container and that meets the standards for temperature characteristic tests set by the Japanese Industrial Standards for the heating section of disposable heating pads.

(Means for Solving the Problems) The present invention provides a cooling jacket connected to a refrigerator on the top surface of a sealed thermostatic chamber, and an electric heater on the bottom surface of the thermostatic chamber. This is a constant temperature sustaining device for measuring the temperature of disposable thermometers, etc., which is characterized by a motor and electric heater that are the driving source of the machine, and a temperature sensor installed in a constant temperature bath connected to a temperature controller.

(Example) Next, an example of implementing the present invention will be described below. 1 is a refrigerator a disposed on the upper surface 2 in a closed thermostatic chamber a.
This is a cooling jacket with fins 1' connected to 3.

A motor 4 is driven to the refrigerator 3 via a belt. 5
Reference numeral 7 indicates a wire mesh section laid horizontally on the lower surface 6 of the thermostatic oven a, and 7 indicates an electric heater disposed below the wire mesh section 5. Reference numeral 8 denotes a temperature sensor installed in the thermostatic oven a, and 9 a temperature TA controller that connects the above-mentioned motor 4, electric heater 5, and temperature sensor 8, and the regulator 9, electric heater 5, and motor 4. For example, if the temperature in the thermostatic oven a is set to 20°C via the temperature controller 9 via the temperature sensor 8, then when the temperature rises above the set temperature, the 9 turns off the electric heater 5, and when the temperature drops below the set temperature, the heater 5 is turned on. When the temperature rises above the set temperature, the motor 4 is driven at the same time as the above-mentioned operation, the refrigerator 3 is rotated, and cold air is released from the cooling jacket 1, causing natural convection of the cold air inside the thermostatic chamber a. and when the temperature drops below the set temperature, motor 4 and refrigeration 4M! 3 is stopped, the release of cold air from the cooling jacket l is reduced, and the temperature of the thermostatic chamber a stops decreasing. lO is a heating device (hereinafter referred to as JIS heating device) that constitutes a JIS heating device set in a constant temperature bath a, and this JIS heating base 10
Usually two sets are set. In the present invention, a sliding glass door 11 is fitted in the front of the thermostatic oven a. 12
is a disposable thermometer hung on the front of each JIS heater lO for temperature characteristic testing. Reference numeral 13 denotes a temperature sensor attached to the thermostat 12, and the sensor 13 is connected to a temperature recorder installed above the outside of the thermostatic chamber a. C is a circulation type constant temperature water tank installed above the outside of constant temperature tank a, and a circulation pump 14 is built in inside the constant temperature bath 46C.
In addition, a flow meter 15 attached to the outer surface is connected to the constant temperature water tank C and the circulation pump 14. 16 is a temperature regulator for adjusting the temperature of hot water in the constant temperature water tank C, and 17 is a JIS hot water heater l installed in the constant temperature tank a to circulate hot water in the constant temperature water tank C via the circulation pump 14. This is a pipe that sends the hot water within the ward and then sends the hot water again into the constant temperature water tank C.The hot water circulates as above, and the temperature of the surface of the heating part of the JIS heater IO is measured at 30℃. can be held at all times. Reference numeral 18 is a line graph showing the heat generation temperature of the disposable thermometer 12 that was subjected to the temperature characteristic test, 19 is a line graph showing the hot water temperature, and 20 is a line graph showing the room temperature.

(Function) Next, to explain the present invention in detail, a disposable test tube 12 is suspended from the front of the JIS heater 10 in accordance with the JIS standards.

Then, when the temperature distribution accuracy in the thermostatic chamber a is set to within 20±1"0, and the temperature of the JIS warmer lO is set at 30° C., and the apparatus of the present invention is operated, the following results. In order to maintain the set temperature of 20°C in the thermostatic oven a, the temperature sensor 8 operates, and if the temperature in the thermostatic oven a rises above 20°C, the temperature regulator 9 operates and the electric heater 5
On the other hand, the motor 4 and the refrigerator 3 are driven to release cold air from the cooling jacket 1, and the released cold air is averaged to every corner of the tank A by natural convection, so that the cold air inside the tank C is turned off. Average the temperature distribution in each part of the area. Furthermore, in the present invention, when the temperature in the thermostatic chamber a drops below the set temperature of 20°C, the temperature sensor 8 detects this and the temperature regulator 9
The electric heater 7 is turned on to radiate heat from the bottom. At the same time, the drive of the motor 4 and refrigeration Ia3 is cut off to weaken the cooling power of the cooling jacket (1a) and stop the release of cold air.As mentioned above, the heat dissipation by the electric heater 7 is not by the action of a fan, but by the natural convection method. The temperature distribution in each part of tank a is raised on average without causing any difference. Therefore, in the present invention, in order to reduce deviations in the temperature distribution of each part in the thermostatic chamber a, a forced circulation system using a fan is not adopted, so that the wind speed can be maintained at a calm state. As shown in Fig. 4, a room temperature of 2o±1°C was obtained. This result means that the ambient temperature of the JIS thermal rA10 has passed the JIS standard temperature characteristic method test of room temperature 20±1"O.The thermostatic chamber a of the present invention is a constant temperature test thermostat that conforms to the JIS standard. It is significantly different from the conventional method, which requires a lot of space and cost for a building, such as a room, because it only requires enough space to store a JIS heater that meets JIS standards, so it does not take up much space. This is a simple constant temperature bath a that requires very little manufacturing cost.Furthermore, the constant temperature bath a of the present invention described above is a small one that cannot be entered by a person. There is no deviation in the temperature distribution in each part of the tank.Incidentally, when testing Kairo 12 in a conventional constant temperature room, the room temperature shown in Figure 5 was determined by the influence of the body temperature of the person entering the room. As shown in line graph 20, the result was that the set temperature condition of 20±1° C. could not be maintained.

The above is the description of the device that is the gist of the present invention.

Further, the relationship between the device and each connected device, which is the gist of the present invention, will be explained as follows. That is, test color 1
By the four temperature sensors 13 attached to the back of 2,
The heat generation temperature of each coil 12 and the room temperature inside l1aa measured by the temperature sensor 8 installed in the room are recorded by a temperature recorder, and the results are announced using a memory graph. Furthermore, the hot water sent out by the circulating pump 14 from the circulating constant temperature water 460 that constitutes the JIS standard heating device is heated to a predetermined temperature by the temperature controller 16.
Water is passed into the S temperature fi 310. This hot water is sent into a circulating constant temperature water tank C. The hot water sent in is circulated again following the above-mentioned path to maintain the temperature of the surface of the heating section of the heater at 30±1°C.

Note that the installation location of the device of the present invention is indoors at room temperature (5°C to 30'0), but temperature recorder b,
To maintain the accuracy of the temperature controller 9, do not place it in a dusty place,
Avoid locations where corrosive gases are generated, strong magnetic fields, or sources of radio waves.

(Effect) (!) The present invention is as described above, and is particularly compatible with JIS
A cooling jacket is installed in the upper part of the miniaturized constant temperature chamber that has space to store only the AI heater, and an electric heater is installed in the lower bottom part, and one cooling jacket is used to control the temperature of the motor and refrigerator. The other heater was connected to the temperature controller, and the temperature sensor installed inside the tank was connected to the temperature controller.We adopted a system that does not use a forced circulation fan inside the tank. In addition to being able to reliably maintain the temperature at 20 ± 1°C, which is the measured temperature according to the JIS standard, a windless state can be achieved using the so-called natural convection method that does not use a fan. It has an extremely excellent advantage of being able to maintain the conditions reliably.

(2) Furthermore, since the present invention can be made much more miniaturized than conventional constant temperature chambers, it also has the advantage of having a smaller space occupation rate and being able to significantly reduce manufacturing costs.

[Brief explanation of the drawing]

Fig. 1 is a front view showing the assembled state of the thermostatic sustaining device for temperature measurement of disposable thermometers, etc. of the present invention, Fig. 2 is a perspective view of the main parts of the same in the assembled state, and Fig. 3 is the assembled state of the same device. FIG. 4 is a graph showing the results of a test using the same device, and FIG. 5 is a graph showing the results of a test using a conventional thermostatic chamber. a...-Thermostat, 1.Fist ψ cooling jacket, 1'...-
Fin, 2...Top part, 3...Freezer, 4...Motor, 5...Wire mesh part. 6... Bottom part, 7Φ... Electric heater, 8... Temperature sensor, 9... Temperature 3iIm device, 101411...
Circulation pump, 15... IIFt meter, 16... Temperature regulator, b... Temperature recorder, C... Constant temperature water tank, No. 17... Pipe.

Claims (2)

[Claims] (1) A cooling jacket connected to the refrigerator is installed on the top of the sealed thermostatic oven, and an electric heater is installed on the bottom of the thermostatic oven. A constant temperature sustaining device for measuring the temperature of disposable thermostats, etc., characterized in that a temperature sensor installed in a constant temperature bath is connected to a temperature controller. (2) A constant temperature sustaining device for measuring the temperature of disposable pots and the like as set forth in claim 1, which incorporates a JIS standard circulation type heating device measuring section in a constant temperature bath.