JPH03157144A - Thermostatic device - Google Patents

Abstract

PURPOSE:To improve the reliability of a cooler, to stabilize its cooling capacity and to save energy by providing a looped thermosyphon obtained by connecting a heat exchanger part inside a thermostatic bath and a heat exchanger part outside the bath in the form of a loop to the bath. CONSTITUTION:The inside of the thermostatic bath 1 is separated into a constant-temp. chamber 2 and a temp. controlling chamber 3, and temp.-humidity environment forming devices such as a cooler 4, a heater 5, a humidifier 35 and a blower 6 are provided in the temp. controlling chamber 3. The looped thermosyphon 9 obtained by connecting the heat exchanger part 10 inside the bath and the heat exchanger part 11 outside the bath in the form of a loop is provided to the bath 1. Consequently, the reliability of the cooler is improved, the cooling capacity is stabilized, and energy is saved.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a constant temperature device, and particularly to a constant temperature device suitable for durability testing of electronic components and the like.

[Conventional technology]

As described in Japanese Unexamined Patent Application Publication No. 13435/1983, a conventional constant temperature device has a constant temperature chamber and a constant temperature and constant humidity air supply chamber within a constant temperature chamber via a partition plate, and the air temperature and humidity within the constant temperature chamber are maintained at a constant temperature. The air is adjusted to the desired state using a cooler (refrigeration cycle evaporator), electric heater, and humidifier installed in the constant-humidity air supply room, and then supplied to the constant-humidity room by a blower.

Also, as described in JP-A-60-78331.

There are constant temperature chambers that introduce outside air into a constant temperature chamber in order to obtain a desired temperature inside the constant temperature chamber.

[Problem to be solved by the invention]

In the conventional constant temperature apparatus, the cooler is one of the components of the refrigeration cycle, and the refrigerant flowing out from the cooler is sucked into the compressor. In this case, if the temperature of the air inside the constant temperature chamber is high, the refrigerant flowing out from the cooler will be heated considerably and will be drawn into the compressor in a constant temperature state. As a result, the compressor discharge gas temperature and the compressor motor winding temperature rise, which may cause bearing burnout and motor winding burnout due to deterioration of the compressor lubricating oil. .

Additionally, in order to set the air temperature inside the thermostatic chamber to around normal temperature, some people introduce outside air into the thermostatic chamber.

In this case, if the moisture in the air introduced into the thermostatic chamber causes the surface temperature of the cooler to be below the zero point and lower than 0° C., frost will form on the surface of the cooler.

This caused a decrease in cooling capacity.

As described above, in the conventional technology, consideration has not been given to the reliability of the cooling device, the stabilization of the cooling capacity, and the like.

An object of the present invention is to provide a constant temperature device that can improve the reliability of the cooling device, stabilize the cooling capacity, and save energy.

[Means to solve the problem]

The above object is achieved by providing the thermostatic chamber with a loop-type thermosiphon in which the thermostatic chamber internal heat exchange section and the thermostatic chamber external heat exchange section are connected in a loop.

[Effect]

In the present invention, a loop-type thermosiphon is provided in which a heat exchange section inside the thermostatic oven and a heat exchange section outside the thermostatic oven are connected in a loop.

As a result, for example, when cooling from a state where the internal temperature of the constant temperature chamber is relatively high, the working medium sealed in the loop thermosiphon is cooled by outside air in the external heat exchange section of the constant temperature chamber and condenses. liquefy. The condensate is
It flows into the heat exchange section inside the constant temperature chamber by utilizing the height difference of the heat exchange section inside the constant temperature chamber. Next, the condensate is heated by high-temperature air in the constant temperature chamber (the air in the constant temperature chamber is cooled), evaporates, and flows into the external heat exchange section of the constant temperature chamber.

Since the loop thermosiphon operates in this manner, it is possible to lower the temperature inside the thermostatic chamber without operating a refrigeration cycle or introducing outside air into the thermostatic chamber. When the temperature inside the thermostatic chamber has fallen to a level where operating the refrigeration cycle does not cause any problems, switching from the loop thermosiphon to the refrigeration cycle, or using both at the same time, will improve the reliability of the cooling system. Cooling performance is also becoming more stable. Furthermore, since the operating temperature range of the refrigeration cycle becomes narrower, it is advantageous in terms of energy saving.

〔Example〕

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a longitudinal sectional view showing a first embodiment of the present invention.

The constant temperature device of this first embodiment is a constant temperature bath 1.

The inside of this constant temperature chamber 1 is divided by a partition wall 7 and formed into a constant temperature chamber 2 and a temperature control chamber 3, and this temperature control chamber 3.
The cooling device 8 includes a cooler 4, a heater 5, a humidifier 35, and a blower 6 arranged in the cooler 4, a cooling device 8 connected to the cooler 4, and a loop thermosiphon 9.

A cooler 4, a heater 5, a humidifier 35, and a cooling device 8 connected to the cooler 4 are arranged in the temperature control room 3 to adjust the temperature and humidity of the air. is sent into the thermostatic chamber 2 by a blower 6 to create a temperature and humidity environment within the thermostatic chamber 2.

The loop type thermosiphon 9 has a thermostatic chamber heat exchange section 10.
and a thermostatic chamber external heat exchange section 11 are connected in a loop through piping, and the piping is provided with an on-off valve 12.

A constant temperature device configured in this way is used for durability tests of electronic components, etc., but it is sometimes used by setting a test temperature pattern in which the temperature inside the constant temperature chamber ranges from +100°C to -70°C. , cooling and heating operations are required during the test. The temperature inside the constant temperature chamber 2 is determined by circulating the air in the constant temperature chamber 1 between the constant temperature chamber 2 and the temperature control chamber 3 using a blower 6, and then passing the air through a cooler 4, a heater 5, and so on. The temperature is adjusted by heating and cooling in the heat exchange section 10 in the thermostatic chamber.

The temperature inside thermostatic chamber 2 is now at a level significantly higher than room temperature (
For example, when cooling from +100° C., the on-off valve 12 of the loop thermosiphon 9 is first opened. The working medium in the loop type thermosiphon is the heat exchanger section 10 in the constant temperature chamber.
After being heated in the thermostatic oven external heat exchange section 11, the condensed liquid is condensed and liquefied by being cooled in the thermostatic oven external heat exchange section 10. Flows into section 10. In this way, the working medium circulates within the loop thermosiphon 9 and the thermostatic chamber heat exchange section 1
When evaporating at 0, heat is removed from the air in the thermostatic oven 1 and the air within the thermostatic oven 1 is cooled.

After the temperature in the thermostatic chamber 1 has fallen to a level that does not affect the reliability of the compressor that constitutes the cooling device 8 even if the cooling device 8 is operated, if the temperature is to be further lowered, the loop The on-off valve 12 of the thermosiphon 9 is closed,
The cooling device 8 is operated.

The cooling device 8 uses a refrigeration cycle composed of elements such as a compressor, a condenser, an expansion valve, and an evaporator (cooler 4). In this refrigeration cycle, after leaving the evaporator,
If the temperature of the refrigerant gas sucked into the compressor is high, compressor cooling will be insufficient. Furthermore, the temperature of the discharged gas increases. Therefore, if the cooling device 8 is operated when the air temperature in the thermostatic chamber 1 is high, the lubricating oil sealed in the compressor will deteriorate.

In some cases, this may lead to bearing burnout. It is also conceivable that the compressor motor windings may be burnt out.

However, as described above, in the constant temperature apparatus of this embodiment, when the temperature inside the constant temperature chamber 1 is high, the loop type thermosiphon 9 first lowers the temperature sufficiently and then the cooling cycle starts with the refrigeration cycle. Improves compressor reliability. Also,
Since the operating temperature range of the refrigeration cycle becomes narrower, power is saved.

Next, FIG. 2 is a longitudinal sectional view showing a second embodiment of the present invention.

In this second embodiment, the thermostatic chamber heat exchange section 1o of the loop thermosiphon 9 is arranged on the air inlet side of the cooler 4 in the temperature control chamber 3.

In addition, the heat exchanger section 11 outside the thermostatic chamber of the loop type thermosiphon 9
A blower fan 13 is provided.

The other configuration of this second embodiment is the same as that of the first embodiment.

In this second embodiment, the thermostatic chamber heat exchange section 10 of the loop thermosiphon 9 is arranged on the air inlet side of the cooler 4 in the temperature control chamber 3 through which most of the circulating air passes. This has the effect of increasing cooling capacity.

Next, FIG. 3 is a longitudinal sectional view showing a third embodiment of the present invention.

In this third embodiment, partition walls 7a, 7 are provided in the constant temperature bath 1.
A high temperature chamber 14, a constant temperature chamber 2, a low temperature chamber 5, and a normal temperature chamber 16 are partitioned and formed by b and 7c.

The high temperature chamber 14 and the thermostatic chamber 2 are configured to be able to communicate with each other or to be shut off by dampers 22a and 22b provided on the partition wall 7a. The constant temperature room 2 and the low temperature room 15 are configured to be able to communicate with each other or to be shut off by dampers 22c and 22d provided on the partition wall 7b. In addition, the constant temperature room 2
The room temperature room 16 is a damper 2 installed on the partition wall 7C.
2e.

22f so that communication or interruption is possible.

In the high temperature room 14, a blower 17 for the high temperature room and a humidifier 18 are arranged. Furthermore, a blower 19 for the cold room, a cooler 20, and a heater 21 are arranged in the cold room 15. Further, in the room temperature room 16, a thermostatic oven heat exchange section 10 and a fan 23 for the room temperature room are arranged.

a thermostatic chamber heat exchange section 10 disposed in the room temperature room 16;
A loop-shaped thermosiphon 9 is formed by connecting the thermostatic chamber external heat exchange section 11 in a loop shape through piping. The piping is provided with an on-off valve 12, and 5 the thermostatic chamber external heat exchange section 11
A blower fan 13 is provided.

This third embodiment is used to set electronic parts and the like in a constant temperature room 2 and to apply cold and heat to the electronic parts and the like in an impact manner.

When creating a high temperature environment in the constant temperature room 2, the damper 22
a, 22b, and the other damper 22c.

22d; 22e and 22f are closed, and high temperature air is circulated between the high temperature chamber 14 and the thermostatic chamber 2.

Also, when creating a low temperature environment in the constant temperature room 2, the damper 22c
, 22d, and the other damper 22a.

22b; 22e, 22f are closed, cold room 15 and thermostatic room 2
Circulate low-temperature air between them.

Furthermore, when creating a normal temperature environment in the constant temperature room 2, the dampers 22e and 22f are opened, and the other damper 22a is opened.

22b; 22c, 22d are closed, room temperature room 16 and temperature room 2
Circulate air between them. The air circulating between the normal temperature room 16 and the constant temperature room 2 is cooled or heated in the thermostatic chamber heat exchange section 10 of the loop thermosiphon 9 placed in the room temperature 16, and becomes room temperature air. It circulates between the chamber 16 and the thermostatic chamber 2. The action of the loop thermosiphon 9 here is:
This is the same as the first embodiment.

According to this third embodiment, since outside air is not actively introduced, the low temperature operation mode in which air is circulated between the cold room 15 and the constant temperature room 2 is also used. Frost formation on the cooler 20 does not occur much. As a result, a stable low temperature can be obtained without the need for long-term defrosting operation.

Next, FIG. 4 is a longitudinal sectional view showing a fourth embodiment of the present invention.

In this fourth embodiment, two thermostatic chamber external heat exchange sections 1 are connected in parallel to the constant temperature chamber internal heat exchange section 10 of the loop type thermosiphon 9.
1a and llb are provided.

Of the two thermostatic chamber external heat exchange parts 11a and llb,
One thermostatic oven external heat exchange section 11a is arranged at a higher position than the thermostatic oven internal heat exchange section 10, and the other thermostatic oven external heat exchange section 11
b is arranged at a position lower than 1° of the heat exchange section in the constant temperature oven.

The thermostatic oven internal heat exchange section O and the two thermostatic oven external heat exchange sections 11
An on-off valve 12 is provided in the piping connecting the thermostatic chamber a and The external heat exchange parts 11a and 11b can be switched depending on whether the air circulating inside the thermostat 1 is heated or cooled.

Further, blower fans 13a and 13b are provided in the thermostatic oven external heat exchange parts 11a and llb.

Note that the other configurations of this fourth embodiment are the same as those of the second embodiment.

In this fourth embodiment, when heating the air circulating in the thermostatic chamber 1, the on-off valves 12, 24, and 25 are all opened. In this driving mode.

The working medium in the thermostatic chamber heat exchange section 10 is cooled and condensed. Then, the condensed working medium, the heat exchange part 1 in the thermostatic chamber
The thermostatic chamber external heat exchange section 1 is located at a position lower than 0.
Flows down to 1b. Here, the working medium in the loop thermosiphon 9 is heated by the outside air, evaporates, becomes a gas, and flows into the thermostatic chamber heat exchange section 10 again.

In addition, when cooling the air circulating in the thermostatic chamber 1,
The on-off valve 12 is opened and the other on-off valves 24 and 25 are closed.

In this operation mode, the working medium is circulated between the thermostatic oven internal heat exchange section 10 and the thermostatic oven external heat exchange section 11a, and in the thermostatic oven internal heat exchange section 10, the working medium flows down from the thermostatic oven external heat exchange section ILa. When the medium evaporates, heat is taken away from the air circulating in the thermostatic chamber 1. As a result, the air circulating within the constant temperature bath 1 is cooled.

In a loop-type thermosiphon, the amount of heat transported can be increased by creating an appropriate height difference so that the evaporating part of the working medium is located at a lower position and the condensing part is located at a higher position, thereby making it easier for the condensate to flow. Therefore, as described above, the thermostatic chamber external heat exchange section 11a.

11b has the effect of increasing the amount of heat exchange during cooling and heating of the air circulating in the thermostatic chamber 1.

Note that the same effect can be obtained by arranging two heat exchange parts inside the thermostatic oven and one heat exchange part outside the thermostatic oven.

5 is a longitudinal sectional view showing a fifth embodiment of the present invention.

In this fifth embodiment, a constant temperature chamber external heat exchange section support mechanism 27 is provided outside the constant temperature chamber 1.

The thermostatic chamber external heat exchange section 11 of the loop thermosiphon 9 is supported by the constant temperature chamber external heat exchange section support mechanism 27 so that its position can be changed in the height direction.

On the other hand, flexible tubes 26a and 26b are installed in a part of the piping connecting the inside of the thermostatic chamber and the external heat exchange section 10.11.

Therefore, in this fifth embodiment, the thermostatic oven external heat exchange section 11 can be selectively arranged at a higher position and a lower position than the thermostatic oven internal heat exchange section 10. As a result, one thermostatic oven external heat exchange section 11 can be used as the two thermostatic oven external heat exchange sections 11a of the fourth embodiment.

The same effect as 11b can be obtained.

Furthermore, FIGS. 6 and 7 are enlarged views showing various embodiments of the thermostatic chamber external heat exchanger support mechanism in the fifth embodiment.

In the constant temperature oven external heat exchange part support mechanism 27 shown in FIG.
A column 28 having a slit 29 long in the height direction is fixed vertically.

On the other hand, one ends of arms 30a and 30b are fixed to the constant temperature oven external heat exchange section 11 at intervals in the height direction.
The other end of each arm 30a, 30b extends to the position of the slit 29.

The other ends of the arms 30a and 30b are fastened to the support 28 by bolts inserted into slits 29 of the support 28 and nuts screwed into the bolts, and the bolts and nuts are designated by 30a' and 30b. show.

As a result, in the embodiment shown in FIG.
, 30b, and bolts and nuts 30a' and 30b', it is possible to arbitrarily change the height of the constant temperature oven external heat exchange section 11 along the slit 29 of the support column 28.

In addition, in the thermostatic oven external heat exchange part support mechanism 27 shown in FIG. One end of the arm 32 is fixed.

On the other hand, an arc-shaped support 33 is fixed to the outside of the constant temperature oven external heat exchange section 11. This support 33 has the shaft 31
An arcuate slit 34 is formed with the center at , and the radius is the span from the shaft 31 to the other end of the arm 32 .

The other end of the arm 32 is fastened to the support 33 by a bolt inserted into a slit 34 of the support 33 and a nut screwed into the bolt, and these bolts and nuts are designated by reference numeral 32'.

Due to the above configuration, in the embodiment shown in FIG.
By rotating the thermostatic chamber external heat exchange part 11 around the constant temperature chamber 1 and fixing the other end of the arm 32 with a bolt or nut 32' at an arbitrary position of the arcuate slit 34, the external heat exchanger 11 is substantially transferred to the constant temperature chamber external heat exchange section 11. The height position of the exchange part 11 can be changed.

In addition, the above-mentioned 4. The technique of the fifth embodiment may be incorporated into the third embodiment.

Note that in both the first to fifth embodiments, air inside and outside the constant temperature layer 1 is used as a heat source for driving the loop thermosiphon, so running costs can be significantly reduced.

〔Effect of the invention〕

According to the present invention as described above, the thermostatic oven is equipped with a loop-type thermosiphon in which the thermostatic oven internal heat exchange section and the thermostatic oven external heat exchange section are connected in a loop, thereby cooling the air inside the thermostatic oven. When using a thermostatic chamber, the loop thermosiphon can lower the temperature inside the thermostatic chamber without operating the refrigeration cycle or introducing outside air into the thermostatic chamber. Switching from the loop type thermosiphon to the refrigeration cycle, or using both at the same time, will have the effect of improving the reliability of the cooling system and improving the cooling performance. This has a stabilizing effect, and furthermore, since the operating temperature range of the refrigeration cycle is narrowed, it also has the effect of saving energy.

[Brief explanation of the drawing]

FIGS. 1, 2, 3, 4, and 5 illustrate the first embodiment of the present invention. Second. Third. Vertical cross-sectional views showing the fourth and fifth embodiments, and FIGS. 6 and 7 are enlarged views showing various embodiments of the thermostatic chamber external heat exchange part support mechanism in the fifth embodiment, respectively. 1... Constant temperature chamber, 2... Constant temperature room, 3... Temperature control room, 4... Cooler, 5... Heater, 6... Air blower,
7. Partition wall, 8. Cooling device, 9. Loop type thermosiphon, 10. Heat exchange section inside thermostatic chamber, 11. Heat exchange section outside thermostatic chamber, 12. Opening/closing valve, 14.・High temperature chamber,
15...Cold room. 16...Normal temperature room, 17...Blower for high temperature room, 18
...Same heater, 19...Blower for cold room, 20.
・The same cooler, 21...The same heater, 22a to 22f...
Damper, 23...Blower for room temperature room, lla, llb
... Constant temperature chamber external heat exchange section, 24.25 ... Opening/closing valve, 2
6a. 26b...Flexible tube, 27...Outside the constant temperature chamber ■ 1 Figure 1, No. 21, (L, 26ee) "Sible Tube".

Claims (1)

[Claims] 1. In a constant temperature device in which a constant temperature chamber and a temperature/humidity control room are divided and formed in a constant temperature chamber, and equipment for creating a temperature/humidity environment such as a cooler, a heater, a humidifier, and a blower are arranged in the temperature/humidity control room. . A thermostatic apparatus, characterized in that the thermostatic oven is equipped with a loop-type thermosiphon in which an internal heat exchange part of the thermostatic oven and an external heat exchange part of the thermostatic oven are connected in a loop.