JPH03101844A - Thermostatic bath - Google Patents

Abstract

PURPOSE:To use the thermostatic bath at high and low temps. by relatively moving a Peltier element block and a holding block and providing a moving mechanism. CONSTITUTION:A glass tube 1 contg. a sample is held by the holding block 2, and the lower surface of the block 2 is closely attached to the upper surface of a heat-transfer plate 5 by a lifting mechanism. The block 2 is then heated by an electric heater 7. At this time, the block 2 is separated by >= about 5mm from the Peltier element block consisting of the plate 5, Peltier element 4 and radiator 3 to prevent the transmission of the high temp. of the block 2 to Peltier element 4. Operation is facilitated in this way.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a constant temperature bath using a Bertier element, and particularly to a constant temperature bath that can be used from a low temperature range to a high temperature range. [Prior Art] A thermostatic chamber using a conventional Bertier element has a block of a Bertier element 4 with a radiation fin 3 and a sample holding block 2, as shown in a perspective view and a cross-sectional view in FIGS. 2(A) and (B). It was made up of a single body with the two in close contact with each other.

This is to improve heat conduction between the Peltier element block and the sample holding block 2, and to encapsulate the Vertier element 4 within these blocks to prevent damage to the Peltier element, which generally has low mechanical strength. , this integrated configuration has existed as a fixed concept when using Peltier elements. However, the Peltier element has the decisive property that it is destroyed at temperatures above 80°C, and conventional constant temperature chambers with this integrated structure have only been used for low-temperature applications. [Problems to be Solved by the Invention] Therefore, the present invention breaks the conventional fixed concept and proposes a constant temperature bath that is a Bertier element type constant temperature bath but can also be used at high temperatures of 80°C or higher. Trying to have it serve both low and high temperatures. [Means for Solving the Problems] According to the present invention, in a constant temperature bath that generally uses a Beltier element to cool and heat a sample, a Beltier element block in which the Beltier element is integrated with a heat dissipation block, and an electric heater are combined. It is characterized by comprising a holding block for holding a loaded sample, and a transfer #1 mechanism for moving the holding block and the Vertier element block relatively to bring them into close contact with each other or to separate them. Set up a constant temperature bath.

With this configuration, when used in a high temperature range of 80°C or higher, the electric heater is energized to heat it, drive the moving mechanism to separate the Peltier element block and the sample holding block, and the high heat is removed from the Peltier element block. Operate the thermostatic chamber so that it does not reach the element. When using in low temperature range, do not energize the electric heater mentioned above.
By energizing the Beltier element and placing the Beltier element block in close contact with the sample holding block, it can be used like a conventional Peltier element thermostat. [Example] Fig. 2 shows a conventional constant temperature bath similar to the present invention, with a perspective view (A) and a cross-sectional view (CB). 1 is a glass tube containing a liquid sample and removed from a centrifuge, for example. A plurality of these bodies are inserted and held in holes made in the holding block 2.

Attach a flat Vertier element 4 to the lower surface of the holding block,
The temperature of holding block 2 is controlled by energizing this. 3 is a heat radiator having heat radiating fins of a Bertier element 4.

In the conventional example, the holding block 2, the Bertier element 4, and the heat radiator 3 have an integral structure in which they are laminated in close contact with each other in order to improve heat conduction, and they cannot be disassembled again.

FIGS. 1(A) and 1(B) show a perspective view and a sectional view of a constant temperature bath according to the present invention.

Each reference numeral indicates the same member in Fig. 2, but in this Fig. 1, the top surface of the Beltier element 4 is covered with a heat conductive plate 5, and the stud bolt is raised up from the heat dissipation fin. It is fixed at 6.

The sample to be kept at constant temperature is a liquid contained in a glass tube l.

2 is a holding block made of a good thermal conductor that holds a large number of glass tubes 1 by heat welding, and pressurizes the heat conductive plate 5 to form a Peltier element 4.
Improves heat reception. This tube holding block 2 is provided with a vertical mechanism that moves it up and down so as to separate it from the heat conductive plate 5 by about 51 degrees. (Not shown) An electric heater 7 is fixed to the side surface of the sample holding block 2 so as to surround it, and is used for heating the sample holding block at a high temperature.

The heat conductive plate 5 is a conductive plate made of a material such as copper or aluminum, and its lower surface is brought into close contact with the Peltier element 4 to form a thermal bond with the Peltier element 4. It's well done.

A radiator 3 with fins is attached to the lower surface of the Beltier element 4, and the Beltier element 4 is interposed between the heat conductive plate 5 and the heat radiator 3, and these three members are closely laminated to form one body. It becomes a Beltier element block.

Next, the operation of the constant temperature bath having this configuration of the present invention will be explained.

A glass tube l containing a sample (for example, a centrifugal tube removed from a centrifuge) is held in a sample holding block 2, and the block is moved up and down by a heat conduction plate 5.
stick it to the top surface of the

In this way, the holding block 2 and thus the sample are maintained at a constant temperature by controlling the energization of the Peltier element 4. When the sample is kept at a constant temperature of 80° C. or lower, the same procedure as above is used, so the explanation will be omitted.

Next, when heating the sample at a constant temperature of 80° C. or higher, the sample holding block is heated by an electric heater 7 as is well known, but it should be noted that in this case, the holding block 2, the heat conductive plate 5, and the Peltier element 4 are heated. This is to prevent the heat from being transmitted through the belt consisting of the heat sink and the heat sink 3. Since the vertical and horizontal mechanisms are extremely simple, they are not particularly shown in the drawings, and are simply indicated by up and down arrows on the side walls of the holding block, but what is important in the present invention is not the structure of the vertical mechanism itself. This mechanism provides thermal conductive insulation between the holding book 2 and the Vertier element 4, and the Peltier element can be used in this type of constant temperature bath.

The heater 7 is an example in which a hollow heater is provided so as to surround the holding block 2, but it may also be a type in which a plurality of ball-shaped heaters are inserted into the holding block, or heaters made of powder are distributed within the block. It is a natural theory that it can be transformed in various ways.

[Effects] According to the present invention, a Bertier element type constant temperature bath can be used for both low and high temperatures, and its structure and operation are extremely simple.

[Brief explanation of drawings]

Figures 1 (A) and (B) are a perspective view and a sectional view of a thermostatic oven of the present invention using a Bertier element, and Figures 2 (A) and CB) are a perspective view and a sectional view of a conventional thermostatic oven. Sample tube Sample tube holding block Peltier element heat sink Peltier element heat conduction plate Stud bolt Electric heater Fig. 2 (B) 4 Pel handicraft #li 5: Guiding plate 6, stud bolt 7'' heater (B) 2: Tube holder 3: Heatsink 4: Beltier element

Claims (1)

[Claims] In a constant temperature bath that cools and heats a sample using a Peltier element, a Peltier element block in which the Peltier element is integrated with a heat dissipation block, a holding block for holding the sample incorporating an electric heater, and the holding block. A constant temperature bath characterized by comprising a moving mechanism that moves a Peltier element block relatively to the block and brings the blocks into close contact with each other or separates the blocks.