JPS6213517Y2 - - Google Patents

Description

[Detailed description of the invention] This invention relates to a rectifier for a constant temperature chamber having a convection space layer.

For example, for culturing various bacteria on agar medium.
The temperature distribution accuracy in a thermostatic chamber that maintains a constant temperature such as 25℃ or 37℃ for a long period of time is JIS.
etc., etc. In order to meet such standard values, structures such as natural convection type, air jacket type, whole surface heating type, or forced stirring type are selected. Although the natural convection type is simple and inexpensive, it has the disadvantage that as the number of samples increases, the temperature difference between the upper and lower parts of the thermostatic chamber increases, resulting in poor temperature distribution accuracy.

In addition, the air jacket type provides a convection space layer between the outer case and the inner case, and by controlling the temperature within this layer, a constant temperature is obtained at the joint point. However, since the opening is on the door side, the temperature near the door tends to be low and the temperature at the back tends to be higher. This is because the flow path resistance of the convective space layer is stronger on the structurally more complex door side.
In addition, if the installation surface of the thermostat is tilted when installing it, the flow of the convective space layer will be biased, and abnormalities will occur not only in the depth direction but also in the temperature distribution from side to side. , sufficient care was required. Particularly, as a measure to improve the abnormal temperature distribution in the depth direction of the convective space layer, it is possible to provide a convective space layer inside the door, but this has the disadvantage that the structure becomes complicated. Another option is to use a fan to force the circulation of the entire convective space layer, but although this may alleviate the slope of the floor surface in the installation location, it may not be possible to maintain a constant temperature due to the heat generated by the motor, and it may also be necessary to use a fan for a long period of time. For this type of incubator that operates continuously, it is better not to have a drive unit that can easily become a failure element. There is also a water jacket type that circulates water in the convective space layer. This is because water has a large heat capacity, and although it has excellent constant temperature properties, it requires the use of a pump to circulate the water and the need for a structure that can withstand pressure, making the entire device complicated.

In addition, the fully heated type has 6 parts of the case that forms a thermostat.
Although a good temperature distribution can be obtained by controlling the temperature of the entire surface, the contact area between the heater and the case wall surface is large, so the insulation resistance tends to decrease and the cost increases.

Furthermore, although the forced stirring type is excellent in making the temperature distribution uniform within the thermostatic chamber, it is not necessarily the best when considering samples placed in the thermostatic chamber. This is because samples placed close to the fan are exposed to direct wind, which increases the drying rate for samples with moisture such as agar plates.
Therefore, the conditions will be different compared to samples placed in a place with weak winds, making it unsuitable for long-term culture.

In the first place, an ideal thermostatic chamber must satisfy the following conditions.

b) Temperature distribution accuracy must be within standard values.

(b) There should be no significant deviation in temperature distribution accuracy even when a sample is inserted.

C. Not subject to any restrictions regarding installation.

(d) The internal wind speed is low and the wind speed is almost the same throughout the constant temperature room.

E. Must have high electrical insulation and be safe.

(f) It has few moving parts and can be operated continuously for a long period of time.

G) There are few heat-generating elements other than the heater, and the temperature can be controlled from a low temperature.

This invention aims to improve the drawbacks of the conventional device and provide a constant temperature chamber that satisfies the above conditions.An embodiment of this invention will be described below with reference to the drawings.

That is, in the illustrated embodiment, an inner case 3 forming a sample chamber 2 is housed within an outer case 1;
A convection space layer 4 having a predetermined width is formed between the inner case and the outer case 1. Further, a door 5 is provided on the front surface of the outer case 1 to cover the front opening thereof together with the front opening of the inner case 3 in a freely openable and closable manner. At least two heaters 6, 6 are arranged in the lower part of the inner case 3 in the outer case 1, separated from each other on the left and right sides when viewed from the door 5 side. Furthermore, a flow dividing plate 7 having a V-shaped cross section is provided at the lower part of the inner case 3 to divert the heat generated by the heaters 6, 6. In addition, a pair of convection space layers 4a, 4 formed between both side walls of the outer case 1 and the inner case 3 in the convection space layer 4.
b is provided with rectifier plates 8, 8 which are inclined upwardly toward the door 5 from the rear thereof.

In the above configuration, the air heated by the heaters 6, 6 is divided into left and right halves by the flow divider plate 7 and ascends the convection space layer 4, but along the way, it passes along the flow rectifier plates 8, 8 toward the door 5. and then rises along each of the spatial layers 4a, 4b, thereby maintaining the thermostatic chamber 2 at a constant temperature.

As described above, this invention includes at least two heaters 6, 6 disposed in the lower part of the inner case 3 inside the outer case 1, separated from each other on the left and right sides of the inner case 3 when viewed from the door 5 side. A flow divider plate 7 having a V-shaped cross section is provided at the bottom to divide the heat generated by the heaters 6, 6, so that the air heated by the heaters 6, 6 flows through the pair of left and right convection space layers 4a, 4b. Therefore, the thermostatic chamber 2 can be heated uniformly, and the slope of the floor at the installation location can be significantly reduced.

Further, a rectifying plate 8 is provided on a pair of convection space layers 4a and 4b formed between both side walls of the outer case 1 and the inner case 3, and is inclined upwardly from behind toward the door 5.
8, the rising air is guided to the door side where the temperature tends to drop, which eliminates the temperature difference between the front and rear of the constant temperature room 2, and also allows for the front and back inclination of the installation location. There is.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a thermostat showing an embodiment of this invention, and FIG. 2 is a front sectional view. DESCRIPTION OF SYMBOLS 1...Outer case, 2...Thermostatic chamber, 3...Inner case, 4...Convection space layer, 4a, 4b...Pair of convection space layers, 5...Door, 6, 6...Heater, 7... ...Broadcast plate, 8,8...Broadcast plate.

Claims (1)

[Claims for Utility Model Registration] (1) By accommodating an inner case 3 forming a thermostatic chamber 2 within the outer case 1, a convective space layer 4 is formed between the inner case and the outer case 1; In addition, the outer case 1 has a door 5 that covers the case together with the inner case 3 so as to be openable and closable.
At least two heaters 6, 6 are provided in the lower part of the inner case 3 in the outer case 1 and arranged separately on the left and right sides of the inner case 3 when viewed from the door 5 side. is a rectifier for a thermostatic chamber, which is provided with a flow divider plate 7 having a V-shaped cross section that divides the heat generated by the heaters 6, 6. (2) A pair of convective space layers 4a and 4b formed between both side walls of the outer case 1 and the inner case 3.
The rectifying device for a thermostatic chamber according to claim 1, which is provided with rectifying plates 8, 8 that are inclined upwardly from the rear toward the door 5.