JPH07275719A - Column thermostatic bath - Google Patents

Abstract

PURPOSE:To forcibly make a heater radiate heat, to improve heat efficiency, to reduce heater capacity, to prevent self-overheat and to lengthen service life by adhering a heater insulated by heat resistant rubber to a heat sink and also installing this heat sink in a tank. CONSTITUTION:An inner case 1 consisting of a metal thin plate forms the four planes of a rectangular parallelepiped, and these outer surfaces are covered with an insulating material 2, and also are decorated with an outer case 3 consisting of metal or the like. Two surfaces of a structure are formed by an upper surface door 7 and a side door so that they each can be opened and closed. In this case, a plate-like heater is arranged on one surface of the inner case 1. The plate-like heater is constituted by adhering a heater element 14 insulated by heat resistant rubber to a heat sink 15. Further, in the central part of the heat sink 15, an air agitating fan 4 and a fan cover surrounding it are arranged. In this way, air in a tank is made to pass the surface of the heat sink 15 by an air agitating fan 4 to heat the inside of the tank.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a column thermostat for a liquid chromatograph.

[0002]

2. Description of the Related Art A conventional heater for a column thermostatic chamber is a plate-shaped heater insulated with heat-resistant rubber attached to the outer surface of a thin metal plate in the chamber, and the wind of an air agitating fan in the chamber is applied to the thin plate to heat the heater. Has a structure that radiates heat. In this method, the heat dissipation efficiency of the heater is poor, and it is necessary to increase the area of the heater in order to prevent self-overheating and increase the heat dissipation efficiency, and the shape of the constant temperature bath is also restricted.

[0003]

In a constant temperature bath whose purpose is to efficiently and uniformly maintain the temperature inside the bath, if the heat dissipation efficiency of the heater itself is poor, the heater capacity will be increased more than necessary, and the power consumption will increase. It is a waste of money. It also causes self-heating of the heater and shortens its life. In addition, it takes a long time to raise the temperature in the tank.

The present invention aims to solve these problems.

[0005]

Since it is desired to make the apparatus itself small, it is necessary to make the heater area as small as possible, and it is necessary to improve the heat radiation efficiency of the heater in order to save power and prevent the heater from overheating.

Therefore, in the present invention, a plate-shaped heater insulated with a heat-resistant rubber is attached to the heat sink, and the plate-shaped heater is sandwiched between the metal plate surfaces in the tank to incorporate the heat sink into the tank. The problem was solved by using a method in which the air from a fan for agitating the internal air was used to discharge it into the tank.

[0007]

The present invention reduces the heater area and heater capacity by increasing the heat dissipation efficiency of the heater.
The self-heating of the heater can be reduced, and the life of the heater can be extended.

[0008]

[Examples] Four sides of a rectangular parallelepiped are formed by a thin metal plate case 1, the outer four sides are covered with a heat insulating material 2, and the outer sides are further covered by a soto case 3 made of metal or the like. The upper door 7 and the side door 8 have a structure that can be easily sealed and opened. The structure of each door is such that the heat insulating material is held by the inner metal plate and the outer decorative plate, and the rubber packing 6 is arranged on the surface in contact with the outer case 1 and the joint between the top door 7 and the side door 8, respectively. Is a closed structure. The case 1 of this structure
A plate-shaped heater 11 is installed on one surface of the heat sink 15.
It is attached to the case 1 with a plate heater sandwiched between them. The heat sink 15 has an air agitation fan 4 in the center thereof, and a fan cover 16 covers and hides them. The inside air passes through the surface of the heat sink 15 by the air agitation fan 4 and is sucked into the air agitation fan 4 as it warms the inside of the tank. There is a temperature sensing element 5 at this inlet, which senses the temperature and feeds it back to the control circuit. Then, the inside of the tank is controlled to a constant temperature.

[0009]

By adhering the plate-shaped heater to the heat sink and forcibly radiating the heat, the thermal efficiency is improved and the heater capacity can be reduced. In addition, the self-heating of the heater can be prevented and the life of the heater can be extended.

[Brief description of drawings]

FIG. 1 is a plan view of a column constant temperature bath.

FIG. 2 is a sectional view taken along line AA.

FIG. 3 is a diagram showing a front panel.

FIG. 4 is a sectional view taken along line BB.

FIG. 5 is a plan view around a heater.

FIG. 6 is a front view around a heater.

FIG. 7 is a left side view around the heater.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Pouch case, 2 ... Heat insulating material, 3 ... Soto case, 4 ... Air stirring fan, 5 ... Temperature sensitive element, 6 ... Rubber packing, 7 ...
Top door, 8 ... Side door, 9 ... Column, 10 ... Sample injector,
11, 14 ... Heater, 12, 13 ... Reinforcing bending, 15 ... Heat sink, 16 ... Fan cover.

Claims (2)

[Claims] 1. A rectangular parallelepiped box formed of a thin metal plate is covered with an insulating material, a heater, a temperature sensitive element and a fan for air agitation are installed inside, and a temperature control circuit keeps the internal temperature constant. In the constant temperature bath to be kept, a column constant temperature bath characterized in that a heat-resistant rubber-insulated plate-shaped heater is attached to a heat sink and the heat sink is installed in the bath. 2. A column thermostatic chamber according to claim 1, wherein a plate-shaped heater insulated with heat-resistant rubber is sandwiched between a thin metal plate in the bath and a heat sink.