JPH08159993A - Distillation testing thermostat - Google Patents

Abstract

PURPOSE: To easily and accurately control the temperature with excellent temperature response with a small-sized light-weight apparatus by integrally surrounding a metal pipe for passing sample fluid with a metal block and controlling the heating or cooling of the block. CONSTITUTION: The central part of a condensing tube 10 made of a brass tube, etc., of a sample passing route is integrally surrounded by a metal block 11 made of aluminum. A temperature control circuit 14 controls the heating or cooling of a plurality of electronic cooling elements 12 adhered to a plurality of positions of the block 11 based on the detected temperature of a temperature sensor 13 embedded in the block 11, and controls the block 11 to a predetermined temperature. The heated and vaporized sample is fed to the tube 10 in the block 11 cooled to the predetermined temperature, cooled to be liquefied in the tube 10, and dropped from an outlet 10b . Either the distillation temperature to a specified distillation amount or the distillation amount to a specified distillation temp. is read and recorded from the initial boiling point of starting to drop at this time to the end of the distillation.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a distilling test thermostat suitable for use in place of a thermostat for temperature control of a sample fluid in a distilling test.

[0002]

2. Description of the Related Art Conventionally, the distillation test method of JISK2254 fuel oil has been used for the distillation test of gasoline, turbine oil, kerosene, light oil, etc., and FIG. 2 shows the type 2 distillation test described in this distillation test method. Figure 3 shows a sectional view of the condensation bath of the vessel. A heat carrier 2 such as water is filled in a condensation bath 1 made of a corrosion resistant metal having a cold insulation wall. A condensing tube 3 made of a brass tube is introduced from the outside to the condensing bath 1, and an inlet portion 3a and an outlet portion 3b are provided outside the condensing bath 1. The condensing pipe 3 in the condensing bath 1 has a smooth curved shape, and the heat medium 2
The sample passing through the condenser tube 3 can be sufficiently cooled.

A lid 4 made of the same corrosion-resistant metal is provided on the upper side of the condensation bath 1, and a lid 5 is provided with a temperature detecting end 5 for detecting the temperature of the heat medium 2 and a heater 6 for heating the heat medium 2. ing. A refrigerator 7 is provided outside the condensing bath 1 so that the heat medium 2 circulates between the condensing bath 1 and the refrigerator 7. Therefore, the heating medium 2 is controlled to a temperature of 0 to 60 ° C. by the heater 6 and the refrigerator 7.

[0004]

However, in the above-mentioned conventional example, the temperature of the heat medium 2 such as 9 liters of water is controlled by heating and cooling it by the heater 6 and the refrigerator 7. It takes a considerable amount of time for 2 to reach a predetermined temperature, and the thermal response is poor, and it is difficult to perform accurate temperature control. Further, since the condensing bath 1 is large, the entire apparatus becomes large, and further, due to environmental problems, the use of CFCs is restricted, and there is a problem that the conventional refrigerator cannot be used.

The object of the present invention is to solve the above problems,
(EN) It is an object to provide a small and lightweight thermostatic device for a distillation test, which has a good thermal response and is easy to handle.

[0006]

In order to achieve the above object, a constant temperature apparatus for distilling test according to the present invention comprises a pipe made of a good heat conductive metal through which a sample passes, and a pipe surrounding the pipe. A metal block, a temperature sensor for detecting the temperature of the metal block, a heating / cooling unit for heating or cooling the metal block, and an output to the heating / cooling unit controlled by the output of the temperature sensor to control the metal block. And a temperature control means for holding the temperature at a predetermined temperature.

[0007]

In the thermostatic device for distillation test having the above-mentioned structure, the metal pipe through which the sample fluid is passed is integrally surrounded by the metal block, and the metal block is heated and cooled by the heating / cooling means. Is maintained at a predetermined temperature.

[0008]

The present invention will be described in detail with reference to the embodiment shown in FIG. FIG. 1 is a perspective view showing the configuration of this embodiment, in which the condensation bath and heat medium of the conventional example are replaced by a metal block made of, for example, aluminum. The condensing tube 10 formed of a brass tube or the like, which is a sample passage, is formed in, for example, a substantially U shape, and the central portion thereof is integrally surrounded by the metal block 11. The condensing tube 10 is preferably closely attached to the metal block 11 without any gap in order to improve heat transfer. For example, a predetermined portion of the condensing tube 10 is formed by casting in aluminum.

In order to change the temperature of the metal block 11, a plurality of electronic cooling elements 12 utilizing the Peltier effect are attached. Also, the metal block 1
A temperature sensor 13 is embedded in the inside of the condenser tube 1,
The temperature is being detected in the vicinity of. This temperature sensor 1
The output of 3 is connected to the temperature control circuit 14, the output of the temperature control circuit 14 is connected to each electronic cooling element 12, and the temperature control circuit 14 switches the direction of the current flowing through the electronic cooling element 12 to change the magnitude of the current. Heating or cooling can be performed by controlling.

The heating and cooling of the electronic cooling element 12 are controlled by the temperature sensor 13, the temperature control circuit 14, and the feedback loop of the electronic cooling element 12, and the condensing pipe 1
The metal block 11 surrounding 0 is controlled to a predetermined temperature.

For example, in a distillation test, a sample in a flask (not shown) is heated by an electric heater or the like to raise its temperature, and the sample is vaporized and cooled to a predetermined temperature from the upper part of the flask through the inlet 10a of the condensing pipe 10. The metal block 11 flows into the condensing pipe 10. Sample gas is condensed tube 10
The sample is cooled and condensed to be liquefied, and the sample flows through the condensing pipe 10 and is dropped from the outlet 10b. At this time, from the initial distillation point at the start of dropping to the end of distillation, either the distillation temperature for the specified distillation amount or the distillation amount for the specified distillation temperature is read and recorded.

In this embodiment, since the heating and cooling can be freely controlled by switching the direction of the electric current flowing through the electronic cooling element 12, it is not necessary to provide both a heating heater and a refrigerator, and maintenance of the apparatus can be performed. It also facilitates maintenance and inspection work. Further, since a conventional refrigerator using CFC or the like is not used, it is possible to provide an inexpensive and environmentally safe device.

The heating / cooling means is not limited to the electronic cooling element 12 of the embodiment, and it is of course possible to use other means.

[0014]

As described above, the constant temperature apparatus for distillation test according to the present invention can heat or cool the sample fluid by heating or cooling the metal block, so that the temperature response is fast and the temperature control is easy and accurate. Can be implemented. In addition, since the device is small and lightweight, it is easy to handle.

[Brief description of drawings]

FIG. 1 is a configuration diagram of an embodiment.

FIG. 2 is a configuration diagram of a conventional example.

[Explanation of symbols]

 10 Condensing Tube 11 Metal Block 12 Thermoelectric Cooling Element 13 Temperature Sensor 14 Temperature Control Circuit

Claims (3)

[Claims] 1. A pipe made of a metal having a good thermal conductivity through which a sample passes, a metal block integrally surrounding the pipe, a temperature sensor for detecting the temperature of the metal block, and heating the metal block. Or a heating / cooling means for cooling, and a temperature control means for controlling the output to the heating / cooling means by the output of the temperature sensor to maintain the temperature of the metal block at a predetermined temperature. Thermostatic device. 2. The thermostatic device for distillation test according to claim 1, wherein the metal block is made of aluminum. 3. The thermostatic device for distillation test according to claim 1, wherein the heating and cooling means is an electronic cooling element.