JPS6213518Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a constant temperature chamber that always maintains a constant temperature inside the constant temperature chamber, and more specifically, to a constant temperature chamber that can maintain a uniform temperature distribution within the constant temperature chamber. It is related to.

Conventionally, in a constant temperature chamber, when a temperature change occurs in the constant temperature chamber, the temperature is maintained at a set temperature by heating with a heater or cooling with a freezing device. In order to maintain a constant temperature within the thermostatic oven as described above, air is circulated into the thermostatic oven from a duct section in which a heater or an evaporator in a refrigeration system is installed. At this time, when the temperature difference between the temperature inside the thermostatic chamber and the evaporator is large, the heat exchange rate is good, and the air becomes locally low temperature near the inlet of the refrigerant to the evaporator.
There was a problem in that other parts were not cooled as much, causing uneven temperature distribution in the circulating air flow, resulting in uneven temperature distribution within the thermostatic chamber.

In order to solve the above problems, in the past, the cooling fins were removed from the vicinity of the inlet of the refrigerant piping in the evaporator to reduce the heat exchange rate of the part where the refrigerant flows into the evaporator, and the overall Although a method has been developed that attempts to make the temperature distribution uniform by making the heat exchange rate uniform, it has not been fully satisfactory for making the temperature inside the thermostatic oven uniform.

The present invention was devised in view of the above-mentioned conventional problems, and even when a part of the circulating air flow is kept at an extremely low temperature by the evaporator and the temperature distribution is uneven, When air flows into the thermostatic chamber, the temperature distribution of the air flow is made uniform to maintain a uniform temperature distribution inside the thermostatic chamber.

Hereinafter, one embodiment of the present invention will be described in detail using the drawings.

As shown in FIGS. 1 and 2, the thermostatic chamber 1 according to the present invention has its interior divided into a thermostatic chamber 5 and a duct section 7 by a partition section 3 such as a partition plate or a wall. The upper and lower parts of the tank 5 communicate with the upper and lower parts of the duct part 7. Therefore, air can be circulated from the constant temperature bath 5 to the duct section 7. An evaporator 9 in a refrigeration system (not shown) is disposed at the bottom of the duct part 7,
This evaporator 9 is provided with a refrigerant pipe 11 . Further, a heater 13 is arranged above the evaporator 9.

The evaporator 9 and the heater 13 are used to cool or heat the circulated air and constitute a kind of heat exchange device, and the control device controls the temperature based on the temperature detected by an appropriate temperature sensor installed in the thermostatic chamber 5. It is appropriately controlled by.

In the duct portion 7, above the heater 13, as shown in FIG. 1, rectifying plates 15a and 15b are arranged in a V-shape so that the center portion is narrow. Further, an appropriate number of fans 17 are arranged above the current plates 15a and 15b. This fan 17 functions to blow the air inside the duct section 7 into the thermostatic chamber 5. In this embodiment, an axial flow fan is used as an example, but the fan may be of any type, for example, a cross flow fan. Moreover, the number may be an appropriate number. A punching board 19 having a large number of small holes is disposed in a communication section between the upper part of the duct part 7 and the upper part of the thermostatic chamber 5 to uniformly disperse the air blown by the fan 17.

In the above configuration, when the fan 17 is rotated, the air inside the duct section 7 is blown into the thermostatic chamber 5, so that the inside of the duct section 7 becomes negative pressure, and from the lower part of the thermostatic chamber 5 to the lower section of the duct section 7. Air will flow into. The air flowing into the duct part 7 is
It is cooled by the evaporator 9 (the heater 13 is in a stopped state), and is sucked into the fan 17 and rises. Since the fan 17 blows air into the thermostatic chamber 5, the air circulates as shown by arrows in FIGS. 1 and 2.

As mentioned above, when the circulating air is cooled by the evaporator 9, the heat exchange rate is good and one part of the airflow becomes extremely low temperature, resulting in uneven temperature distribution of the airflow. Even if the current plate 15a,
15b concentrates the flow to the central opening, and at this opening, as shown in FIG.
The flows from the left and right will mix. and,
When the air is blown into the thermostatic oven 5, it is further stirred by the fan 17 and the punching board 19, so that the temperature distribution within the thermostatic oven 5 is made uniform.

According to experiments, it is desirable that the ratio of the width h of the openings of the rectifying plates 15a and 15b to the width H of the duct portion 7 is about 4:1. That is, if the opening width h is too small relative to the width H of the duct portion 7, the pressure loss will increase, and conversely, if the opening width h is too large, the mixing ratio of the circulating air flow will decrease and the temperature distribution will not be uniform. This will worsen the situation.

As can be understood from the above description of the embodiments, the gist of this invention is as stated in the claims for utility model registration. Even if the distribution is non-uniform, when the air is blown into the thermostatic oven, it is mixed and the temperature distribution of the air flow is made uniform, so that the temperature distribution inside the thermostatic oven can be maintained uniformly.

Note that this invention is not limited to the above-mentioned embodiments, but can be implemented in other forms by making appropriate design changes.

[Brief explanation of the drawing]

FIG. 1 is a front sectional view schematically showing the configuration of a thermostatic chamber according to the present invention, taken along the - line in FIG. 2. FIG. 2 is a sectional view taken along the - line in FIG. 1. Explanation of the symbols representing the main parts of the drawing, 3...
Division section, 5... Constant temperature chamber, 7... Duct section, 15
a, 15b... rectifier plate, 17... fan.

Claims (1)

[Scope of Claim for Utility Model Registration] (1) A thermostatic chamber and a duct section are separated by a partition section, and the upper and lower sections of the thermostatic chamber are connected to the upper and lower sections of the duct section, and the section is disposed within the duct section. 1. A thermostat characterized by comprising a rectifier plate arranged in a figure-eight shape above a heat exchanger, and a fan arranged above the rectifier plate. (2) The thermostat according to claim 1, wherein the width of the opening of the current plate is set to about 1/4 of the width of the duct.