JP2002340783A - Apparatus for thermal shock or thermal cycle test - Google Patents

Abstract

PROBLEM TO BE SOLVED: To widen a thermal shock controllable range in a thermal shock test and a thermal cycle test, and enable less energy-consuming and more economical tests than conventionally. SOLUTION: Heat insulating walls which are movable or can be fitted to various positions are set in a testing tank. Gates are set to the heat insulating walls and an inner wall of the tank. A duct for sending a gas is set to the gates. When the duct is connected, the gas having temperature differences can be sent from a heat exchanger → the inner wall → the movable heat insulating walls to a testing region. Moreover, the gas can be mixed with a supplied gas while an amount of the exhaust is regulated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a test apparatus for giving a temperature change such as any thermal shock test.

[0002]

2. Description of the Related Art Conventionally, various tests have been carried out in a thermal shock test apparatus, a thermal cycle test apparatus, and an environmental apparatus having a gas phase test tank having a fixed volume. Since the tank has a constant volume regardless of the size of the target test object, even when performing a test on a test object of a small size, the atmosphere in the entire tank is adjusted to the target temperature, or It was necessary to give the target thermal shock.

Conventionally, a temperature profile is obtained for a gas phase in a tank, and a test is managed based on the temperature.

[0004]

Conventionally, each test was conducted in a thermal shock test apparatus, a thermal cycle test apparatus, and an environmental apparatus having a gas phase test tank of a fixed volume, so that the size was small and the heat capacity was small. Even when a test is performed on a test object, the entire volume of the tank needs to be in the same environment, so that the thermal efficiency is poor and it is difficult to give a high thermal shock.

Conventionally, a temperature profile is obtained for a gas phase in a tank, and a test is managed based on the temperature. However, in practice, the temperature of the test object is reduced to the temperature of the atmosphere. I can't say I'm following exactly.
An example is a case where a test is performed on an object having a large heat capacity and a relatively small size. In that case,
It cannot be said that the intended thermal shock and temperature are accurately applied to the test object.

[0006]

SUMMARY OF THE INVENTION Using a movable or removable insulating partition, the volume of the part to be tested in the test chamber is made as small as possible in accordance with the test object. An air duct that connects the side of the partition and the outlet on the side of the inner wall of the test tank is used to feed or suck the atmosphere into the local part. By doing so, the heat capacity of the test object volume or the amount of gas required for replacement is reduced, so that a high thermal shock test and an economical test can be performed.

Using a thermometer such as a thermocouple, the exhaust gas or the outside air is mixed with the intake gas while adjusting the amount based on the temperature of the test object. This makes it possible to apply a subtle temperature shock economically and accurately to the test object.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is an external view of a thermal shock test apparatus. Here, the upper part is the test tank, and the lower part is to make a temperature difference between the gases to change the temperature of the test object. From there, the gas with a temperature difference is carried to the upper part.

FIG. 2 shows the inside of the test tank. 2 in FIG.
Is a test object, and a test space is constituted by a movable heat insulating wall indicated by reference numeral 2 and a built-in heat insulating wall indicated by reference numeral 3. At the corner of the heat insulating wall indicated by reference numeral 2 in FIG. 2, the inside of the test tank indicated by reference numeral 4 is a rail, and is fitted so as to be movable. Further, as shown in FIG. 3, the movable heat insulating wall 2 has a structure such that the heat insulating wall 3 having the structure as shown in FIG. Can be adjusted. The sealability of the portion to be tested is maintained to a certain extent in a portion where the heat insulating wall 3 is not interposed, because the reference numeral 9 is made of a superelastic material such as rubber.

The heat insulating wall 3 shown in FIG. 2 has a structure as shown in FIG. 4, and the movable heat insulating wall 2 shown in FIG. As shown in FIG. 5, the sealability of the part that is not fitted is 2 in FIG.
The movable insulating wall 2 is sandwiched between the movable insulating wall 2 and the portion where the movable insulating wall 2 is sandwiched by the elastic body 11 being disposed in the deep gap. Parts that are not closed are secured by closing them. Reference numeral 12 in FIG. 4 is fixed in the state shown in FIG. 4 when the heat insulating wall 3 is fitted, and is released to the left when the movable heat insulating wall 2 is set therebetween. In order to fix the heat insulating walls 2 and 3 at the intended positions, the heat insulating walls 2 and 3 are fixed to the holes indicated by reference numeral 5 in FIG. 2 with the screw-type stoppers shown in FIG. If it fixes in the part of the code | symbol 13 of FIG. 7, in the case of the board | plates like the heat insulation walls 2 and 3 of FIG. The size of the plate indicated by reference numeral 14 in FIG. 6 also contributes to stability.

After setting the movable and fitted heat insulating walls 2 and 3 at intended positions in accordance with the size of the test object, an air duct indicated by reference numeral 6 in FIG. 2 is attached to the side surface of the heat insulating wall 2 in FIG. 2 and the gate on the inner wall side of the test tank 4 in FIG. One is a duct for feeding gas and the other is a duct for exhausting. A plate for changing the outflow direction of gas is provided as indicated by reference numeral 15 in FIG. 2 so that the gas circulates sufficiently. The gate on the inner wall side of the test tank 4 in FIG. 2 is directly connected to the air passage to the heat exchanger. Further, depending on the height of the test tank, this duct is provided with reference numeral 17 in FIG. 2 or reference numeral 1 in FIG.
As shown by 8, a plurality of duct connection gates are present, and various combinations of gas paths can be provided as needed.

As shown in FIG. 8, the gas having the temperature difference is connected to a thermometer for measuring the temperature of the test object indicated by reference numeral 19 and a valve indicated by reference numeral 20 in FIG. The control unit indicated by reference numeral 21 in FIG. 8 for controlling the fan / heat exchanger is linked in real time and sent in accordance with the thermal shock set before the start of the test.

With the above setting (FIG. 2), the temperature range was adjusted from 20 ° C. to 125 ° C., and the partition was adjusted so that the test space became 1/6 of the volume of the test tank, and the heat was applied to eight BGA samples. When a test for applying an impact was performed, the test object reached 125 ° C. about four times faster than a conventional apparatus having a similar heating capacity and a similar setting.
In addition, when a test was performed with the same setting and the thermal shock was set at 20 ° C./min from 20 ° C. to 125 ° C., the power consumption was reduced to の of the conventional power consumption.

[0015]

The heat capacity of the entire test space is low by using a movable or removable partition to reduce the volume of the portion to be tested to the size of the test object as much as possible. Is extremely reduced as compared with the related art, and the temperature of the test space and the test object can be efficiently changed. In addition, despite the test using a gas phase, it is possible to easily apply a higher thermal shock than before.

The temperature of the intake air is determined by mixing the exhaust gas or room temperature gas into the intake gas based on the temperature of the test object using a thermometer such as a thermocouple or a radiation thermometer. In addition, the thermal shock to be applied to the test object can be accurately controlled.

[Brief description of the drawings]

FIG. 1 is an external view of an apparatus of the present invention.

FIG. 2 is a diagram viewed from the front inside a test chamber.

FIG. 3 is a diagram showing a vertically movable heat insulating wall.

FIG. 4 is a view showing a heat-insulating wall of a lateral insertion type.

FIG. 5 is an enlarged view showing a portion denoted by reference numeral 10 in FIG. 4;

FIG. 6 is an enlarged view showing a portion denoted by reference numeral 7 in FIG. 2;

FIG. 7 is a view showing a fixed portion of the heat insulating walls 2 and 3 of FIG. 2;

FIG. 8 is a diagram showing a gas flow and a control mechanism of a portion other than the test tank.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Test object 2 Movable heat insulation wall 3 Embedded heat insulation wall 4 Test tank 6 Air duct 9 Superelastic body 17, 18 Duct connection gate 19 Thermometer 20 Valve / fan / heat exchanger 21 Control unit

Claims (4)

[Claims] 1. A test apparatus for applying a thermal cycle or thermal shock, wherein the inside of a test tank can be partitioned by a movable or removable partition so as to have a minimum necessary volume. 2. The heat cycle or thermal shock according to claim 1, wherein there is a gate for installing an air duct for feeding or discharging a gas for giving a temperature change to various parts of the partition wall or the test chamber wall. Giving test equipment. 3. The method according to claim 1, wherein the temperature of the gas sent into the test vessel is mixed with air before inhalation or air before heat treatment to control the thermal shock applied to the test object. A test device that gives a thermal cycle or thermal shock. 4. When a thermal shock is applied to a test object by the method according to claim 3, a thermometer such as a thermocouple or a radiation thermometer is used to measure not the temperature of the gas phase but the temperature of the test object itself. The thermal cycle or thermal shock test apparatus according to claim 1, wherein the thermal shock or thermal shock is controlled by controlling the thermal shock to be applied and measured and fed back to the method according to claim 3.