JPH04364440A - Thermal-shock testing apparatus - Google Patents

Abstract

PURPOSE:To omit the introduction of outer air which is the cause of frosting and to eliminate the interruption time of a test due to frost removal by providing an independent dry-air storing chamber, and circulating the air in a test chamber. CONSTITUTION:The air in a high temperature chamber 2 is returned to heater 3 by way of the heater 3, a blower 4 and a heat accumulator 5. Heating is performed to a specified temperature. The air in a low temperature chamber 10 is also returned to a cooler 11 by way of the cooler 11, a blower 13 and a cool-air accumulator 24. Cooling is performed to a specified temperature. The temperature is kept constant with a heater 12. After the high-temperature air and the low-temperature air are prepared in this way, high-temperature dampers 7 and 9 are opened, and the high- temperature air is made to flow into a test chamber through a hot air diffusing port 6 and circulated in the chamber. The air is returned into the high-temperature chamber through a hot-air sucking port 8. Temperature stress at the high temperature is imparted by the circulation of the hot air. By the same way, temperature stress at the low temperature is imparted with the constitution of low-temperature dampers 15 and 17, a cool-air diffusing port 16 and a cool-air sucking port 16. Frosting is eliminated by omitting the introduction of outer air in this way.

Description

[Detailed description of the invention]

0001

[Industrial Application Field] The present invention is a thermal shock test for testing the thermal stress characteristics, durability, etc. of the above-mentioned materials by exposing various materials and parts of various equipment to alternately high and low temperature atmospheres. Regarding equipment.

0002

[Prior art] Thermal shock test equipment is disclosed in Japanese Patent Application Laid-Open No. 58-4295.
As described in Publication No. 2, a test chamber and a low-temperature gas supply chamber,
It consisted of three insulated chambers with a hot gas supply chamber. In this case, since outside air is introduced during the normal temperature test, if outside air with outside humidity is introduced, operation will become impossible due to frost formation.

[0003] For this reason, the test was interrupted and the low temperature gas supply chamber was defrosted.

0004

[Problems to be Solved by the Invention] In the above-mentioned conventional technology, when the cooling capacity in the low-temperature chamber decreases due to frost formation, the test is temporarily interrupted, the inside of the low-temperature chamber is defrosted, and the inside of the low-temperature chamber is cooled down to a predetermined temperature again. There was a need. For this reason, there was a problem in that thermal shock tests could not be carried out continuously and the test period increased.

An object of the present invention is to eliminate the introduction of outside air, which causes frost formation, and to eliminate the interruption time of the test due to defrosting.

[0006]

[Means for Solving the Problems] The above object is achieved by equipping the test chamber with an independent dry air storage chamber and circulating this air into the test chamber during normal temperature tests.

[0007]

[Operation] In a thermal shock test device that has a cold room, a high temperature room, and a dry air storage room independent of the test chamber, room temperature tests are carried out during the transition from a low temperature test to a high temperature test, or from a high temperature test to a low temperature test. At this time, air from the dry air storage room is flowed into the test room to return the test room to room temperature. This prevents outside air from entering the test chamber, low temperature room, and high temperature room, and prevents frost from forming on the cooling equipment in the low temperature room, making it possible to conduct long-term thermal shock tests.

[0008]

[Embodiment] An embodiment of the present invention will be described below with reference to FIGS. 1 and 2.

[0009] In FIG. 1, test chamber 1 is an insulated chamber,
In the upper part of the test chamber 1, there is a high temperature chamber 5 which is also insulated. A heater 3, a blower 4, and a heat storage material 5 are arranged in the high temperature chamber 2, and a hot air outlet 6, a high temperature damper 7 that opens and closes the outlet 6, and A hot air inlet 8 and a high temperature damper 9 for opening and closing the inlet 8 are provided.

[0010] Also, in the lower part of the test chamber 1, there is a cold room 10 which is insulated similarly to the test chamber 1. A cooler 11, a heater 12, a blower 13, and a cold storage material 24 are arranged in the cold room 10, and in the opposing heat insulating part of the cold room 10 and the test chamber 1, there is a cold air outlet 14 and a cold air outlet 14 that opens and closes the outlet 14. A damper 15, a cold air inlet 16, and a low-temperature damper 1 that opens and closes the inlet 16.
7 is provided.

[0011] Also, in the upper part of the high temperature chamber 2, there is a dry air storage chamber 1 which is insulated similarly to the test chamber 1, the high temperature chamber 2, and the low temperature chamber 10.
There are 8. The dry air storage chamber 18 stores dry air (not shown) necessary to return the inside of the test chamber 1 to room temperature, and a dry air outlet is provided in the insulating section facing the dry air storage chamber 18 and the test chamber 1. 19 and a normal temperature damper 2 that opens and closes the air outlet 19.
0, a dry air suction port 21, a room temperature damper 22 for opening and closing the dry air suction port 21, and a blower 23.

Next, the operation of the present invention will be explained.

First, prior to the cooling shock test, the air in the high temperature chamber 2 is heated to a predetermined temperature by a circulation path that passes through the heater 3, the blower 4, the heat storage material 5, and returns to the heater 3.

On the other hand, the air in the cold room 10 is also cooled to a predetermined temperature by a circulation path that passes through the cooler 11, the blower 13, the cold storage material 24, and returns to the cooler 11. Note that the air cooled to a predetermined temperature is kept constant at this temperature by the heater 12. When the air in the high temperature chamber 2 and the air in the low temperature chamber 10 are prepared for preheating and precooling in this way, the high temperature dampers 7 and 9 are opened for the first time, and the heated air in the high temperature chamber 2 becomes hot air and the hot air outlet is opened. Air flows into the test chamber 1 through 6, circulates within the test chamber 1, and returns to the high temperature chamber 2 through the hot air inlet 8. This circulation of hot air applies high temperature stress to a sample (not shown) placed in the test chamber 1. After a predetermined test time has elapsed, the high temperature dampers 7 and 9 are closed to complete the high temperature test.

[0015] Also, in the low temperature test, the low temperature damper 15.1
7 is opened, and the cooled air in the cold room 10 becomes cold air and flows into the test chamber 1 from the cold air suction port 14, circulates within the test chamber 1, and returns to the cold room 10 from the cold air suction port 16. This circulation of cold air applies low-temperature stress to a sample (not shown) placed in the test chamber 1. After a predetermined test time has elapsed, the low temperature dampers 15 and 17 are closed to complete the low temperature test.

FIG. 2 also shows the results of a general thermal shock test.
It shows the temperature change inside the test chamber 1.

As mentioned above, a thermal shock test is carried out by alternately introducing hot air and cold air into the test chamber 1, but in the generally established test method, as shown in FIG. When switching to a low temperature test, a room temperature test shall be conducted.

Therefore, in the room temperature test, the room temperature damper 20
22 is opened, the sealed and dried normal temperature air in the dry air storage chamber 18 flows into the test chamber 1 from the dry air outlet 19, circulates in the test chamber 1 as shown by the solid arrow, and the dry air The air returns to the dry air storage chamber 18 from the suction port 21. This circulation of room temperature air returns the inside of the test chamber 1 to room temperature. After a predetermined test time has passed, the room temperature dampers 20 and 22
is closed to complete the room temperature test.

[0019] As described above, since the test is carried out by inflowing and circulating air into the test chamber 1 from the sealed high temperature chamber 2, low temperature chamber 10, and dry air storage chamber 18, the introduction of outside air is eliminated. Frost in the cold room 10 and the test chamber 1 is eliminated. Therefore, there is no need to temporarily suspend the test and defrost the inside of the cold room 10 and the test chamber 1.

[0020]

Effects of the Invention According to the present invention, a low temperature chamber, a high temperature chamber, and a dry air storage chamber are installed side by side to prevent humid outside air from entering the test chamber in each test. Frost is no longer necessary. This makes it possible to conduct thermal shock tests continuously over a long period of time, shorten the test period, and discover defective parts of samples at an early stage.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view showing a normal room temperature test condition of a thermal shock test apparatus according to an embodiment of the present invention.

FIG. 2 is a diagram showing temperature changes in a test chamber in a general thermal shock test.

[Explanation of symbols]

1...Testing room, 2...High temperature chamber, 3...Heater, 4...Blower, 5
...Heat storage material, 6...Hot air outlet, 7, 9...High temperature damper, 8...
Hot air inlet, 10...Cold room, 11...Cooler, 12...Heater, 13...Blower, 14...Cold air outlet, 15, 17...Low temperature damper, 16...Cold air inlet, 18...Dry air storage room,
19... Dry air outlet, 20, 22... Room temperature damper, 21
...Dry air suction port, 23...Blower, 24...Cold storage material.

Claims (1)

[Claims] 1. A thermal shock test apparatus comprising a low temperature chamber and a high temperature chamber independent of the test chamber, the apparatus comprising a dry air storage chamber.