JPS5945936B2 - Cold and heat cycle equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention involves testing and processing of thermal stress characteristics and durability by exposing samples such as materials, parts, and equipment alternately to high and low temperature atmospheres, such as JISC5030 electronic components. A cooling/thermal cycle device for carrying out tests such as those specified in the temperature cycle test of Regarding equipment.

The specimen and the exposure tank are kept stationary and the specimen is exposed to high temperature.
Unlike the case where the test specimen is moved from a high-temperature exposure tank to a low-temperature exposure tank or vice versa, a cold-heat cycle test that involves low-temperature exposure is a test in which mechanical stress is added to thermal stress. The test is not complex, and the test can be performed with high reliability.
Also, unlike a method in which the specimen is kept stationary and the exposure tank is moved, the structure for maintaining the airtightness of the exposure tank does not become complicated. Conventionally, there is a known refrigeration cycle device that exposes the sample to high temperature and low temperature while keeping the sample and exposure tank stationary. A bus configuration in which a test area and a high temperature chamber are connected in a closed loop and a test area and a low temperature chamber are connected in a closed loop are connected in parallel. The bath for exposure (closed loop of test area and high temperature chamber) and the bath for cold exposure (closed loop of test area and low temperature bath) will be in the form of dedicated independent circuits, and the There is a disadvantage that the size of the entire device (space factor) cannot be reduced.

Furthermore, with conventional equipment, the direction of air circulation within the test area differs between high-temperature and low-temperature exposures, which makes it impossible to apply thermal stress to the specimen under the same conditions during high-temperature and low-temperature exposures. However, it is not always possible to perform highly reliable cold and thermal shock tests. Furthermore, in conventional devices of this kind, the interior walls are made of metal plates with a large heat reserve, such as stainless steel, so when the specimen is set in the device, the temperature inside the room is rapidly lowered to a predetermined temperature. (or the temperature rises), the heat capacity of the metal plate becomes a large heat load, which not only takes time to return to temperature but also increases the consumption of electricity for cooling (or heating), causing the equipment to run. The disadvantage was that the cost was high.

The main objectives of the present invention are to eliminate the drawbacks of the prior art described above, to considerably reduce the space factor, and to apply thermal stress to the specimen under the same conditions in high depth exposure and low mud exposure. Our goal is to provide cooling and heating cycle equipment that guarantees

Still another object of the present invention is to provide a refrigeration cycle device in which the time required for temperature recovery is short and the cost of lining the device can be reduced.

The cooling/thermal cycle device of the present invention has a single sealed tank whose interior walls are made of metal plates such as stainless steel, and has a test area for cold and thermal shock tests, and a primary side ventilation of the test area. The high-temperature air-conditioning path and the low-temperature air-conditioning path are connected in parallel, and the secondary ventilation path of the test area is connected in series to form a closed loop, and a high-temperature air conditioner is installed in the high-temperature air conditioning path, and a low-temperature air conditioner is installed in the low-temperature air conditioning path. A damper is provided in the tank to alternately open and shut off the high-temperature air conditioning path and the low-temperature air conditioning path, a circulation blower is placed in the primary ventilation path or the secondary passage path, and The present invention relates to a cooling/thermal cycle device characterized in that a heat insulating coating is applied to an indoor wall surface using a heat insulating material having a small heat capacity.

According to the present invention, by alternately switching the high-temperature air conditioning path and the low-temperature air conditioning path to open and shut them using the damper, and using the high-temperature air conditioner and the low-temperature air conditioner separately, the test area that is in a single sealed tank can be cooled. , serves as a low-temperature exposure tank and a high-temperature exposure tank for thermal shock testing.

In this way, cold and thermal shocks can be applied to the test specimen while the test area, which is an exposure bath, and the test specimen placed there remain stationary. In the present invention, the inside of a single sealed tank includes a test area, a primary ventilation path in the test area, a parallel body of low-temperature air-conditioning paths such as high-temperature air-conditioning paths that are alternately opened and shut off by a damper, and a test area. Since the secondary ventilation path of the area is considered to be a series connection closed loop, not only does the test area double as a high-temperature exposure tank and a low-temperature exposure tank, but the primary and secondary ventilation paths of the test area are highly congested. Useful for common ventilation during exposure and low-temperature exposure, i.e., four-way series connection of the test area, the primary ventilation path of the test area, the parallel combination of the high-temperature air conditioning path and the low-temperature air conditioning bus, and the secondary ventilation path of the test area. The test area, primary ventilation path, and secondary ventilation path, which are the majority of the closed-loop paths, serve as a common circuit for low and high temperature exposure, thus making it possible to make the entire device compact. In particular, the size of the entire device (space factor) relative to the test area capacity can be made as small as possible, and the conventional image that a device with a large effective capacity is large will no longer exist.

Moreover, according to the bus configuration of the present invention, the circulation of air during high-temperature exposure and low-temperature exposure to the test area is performed in the same flow in a one-way manner through the same ventilation path, so that the test area is not exposed to high temperatures. It is ensured that heat stress is applied under the same conditions as with cold exposure.

Furthermore, since the interior walls made of metal plates such as stainless steel were coated with a heat insulating material with a low heat capacity, the metal plates with a high heat capacity that made up the interior walls were coated with the above heat insulation coating. It is thermally isolated from indoors.

Therefore, if we limit ourselves to the short period from the start of cooling (or heating) to the return of the muddy level, the apparent heat capacity of the indoor wall surface is the heat capacity of the heat insulating material that makes up the heat insulation coating, and this heat capacity is equal to that of the metal plate. Since it is much smaller in comparison, it is possible to reduce the apparent heat load on the wall surface of the interior, thereby shortening the time for returning to the depth and further reducing the running cost of the apparatus. An embodiment of the present invention will be described below with reference to the drawings.

In the figure, 1 is a single sealed tank with a cooling inside, a test area 2 for thermal shock tests, and a primary ventilation path 6 for the test area.
, a parallel body of high temperature air conditioning path 3 and low temperature air conditioning path 4, and a series connection closed loop of secondary side ventilation path 5 of test area 2.

A high temperature air conditioner 8 is provided in the high temperature air conditioning path 3, a low temperature air conditioner 9 is provided in the low temperature air conditioning bus 4, and a circulation blower 12 is provided in the ventilation path 6.
will be established. A damper 11 that opens and closes the entrances of the high temperature air conditioning path 3 and the low mud air conditioning path 4, and a damper 10 that opens and closes the exits of the high temperature air conditioning bus 3 and the low temperature air conditioning path 4 are arranged at fixed positions.

The dampers 10 and 11 can be moved to two positions: a position where the high temperature air conditioning path 3 is opened and the low temperature air conditioning path 4 is blocked, and a position where the high temperature air conditioning path 3 is blocked and the low temperature air conditioning path 4 is opened. The displacement of the dampers 10 and 11 may be either a single action method or an interlocking method. When the dampers 10 and 11 are in the position shown by the chain line in FIG. 1, the low-temperature air conditioning path 4 is open and the high-temperature air conditioning path 3 is closed. When the dampers 10 and 11 are in the position shown by the solid line, the high-vortex air conditioning path 3 is open and the low temperature is closed. Air conditioning path 4 is in a blocked state.

When path 4 is opened and path 3 is shut off, that is, when exposed to low temperature, the high temperature air conditioner 8 is not energized and is at rest.
At the same time as path 4 is switched off, ie, switched to high mixing exposure, the current is turned on and controlled at the test mixing level of high exposure.

A metal plate 13 made of stainless steel or the like constituting the interior wall surface of the tank 1 is thermally coated with a heat insulating material 14 having a small heat capacity.

Such a thermal insulation coating can also be applied to the inner surfaces of passes 3, 4, 5 and 6. Metal plate 13! Insulation material 1 for /C
Details of the attachment means 4 are shown in FIGS. 2, 3, and 4. FIG. 2 shows the attachment means using adhesive 15, and FIG. FIG. 4 shows an attachment means using a fastener 16, and FIG. 4 shows an attachment means using a wire mesh 17 (made of inorganic fiber cone), and these attachment means may be used alone or in a suitable combination. Vertical partition 18
Generally, it is only a metal plate, and a heat-insulating coating can be applied to this as well. In Figures 2 to 4, 19
There is no difference at all from the conventional structure, including the heat insulating material, the metal plate 13 as the exterior, and the metal plate 13 as the interior. In the present invention, various types of heat insulating materials can be used as the heat insulating material 14 used for the heat insulating coating.
Among these, materials with extremely low thermal conductivity, excellent heat resistance and cold resistance, and no moisture absorption can be used advantageously.As such insulation materials, for example, silica sponge, foam gas, etc. Among these, silica-based sponges are especially heat resistant vorticity 500℃ cold resistant.
-196℃ Thermal conductivity 0.031Kcat/Mll'C (At
2CfC) Hygroscopicity None Specific gravity 10kg/M
3, which is suitable.

By adhering or covering this surface with glass cloth, it is possible to prevent damage to the silica sponge and further enhance the heat insulation effect.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing an example of the embodiment of the present invention, and FIGS. 2 to 4 are explanatory views showing means for attaching a heat insulating material. In the figure, 1 is a single closed tank, 2 is a test area, 3 is a high temperature air conditioning path, 4 is a low mud air conditioning path, 5 is a secondary ventilation path, 6 is a primary ventilation bath, and 8 is a high vortex. Air conditioner, 9 is a low vortex air conditioner, 10 and 11 are dampers for switching between high and low temperature exposure,
12 is a blower, 13 is a metal plate, and 14 is a heat insulating material.

Claims (1)

[Claims] 1 The interior of a single sealed tank whose interior walls are made of metal plates such as stainless steel is divided into a test area for cold and thermal shock tests, a primary ventilation path in the test area, a high-temperature air conditioning path, and a low-temperature air-conditioning path. Parallel air conditioning paths and secondary ventilation paths in the test area are connected in series to create a closed loop path, and a high temperature air conditioner is installed in the high temperature air conditioning path and a low temperature air conditioner is installed in the low temperature air conditioning path. A damper is provided in the tank to alternately open and shut off the paths, a circulation blower is placed in the primary ventilation path or the secondary passage path, and insulation with a small heat capacity is installed on the indoor wall of the closed tank. A cooling/thermal cycle device characterized by having a heat insulating coating made of wood.