JP2002148315A - Thermal test device for heater element - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve test workability, and to improve test accuracy, concerning a thermal test device for a heater element. SOLUTION: This thermal test device for the heater element for testing the heat-resistant characteristic of the heater element 1 has a formation having an evaluation board 2 capable of mounting the heater element 1 detachably, and evaluating the operation of the heater element 1 by a prescribed test program, a provided heat transfer plate 3 mounted detachably in contact with the radiating surface of the heater element 1, a temperature measuring means 4 of the heater element 1, a vortex tube 5 for jetting a low-temperature cooling wind to the heat transfer plate 3, and an adjustment part 6 for adjusting the compressed air quantity supplied to the vortex tube 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heat test device for a heating element.

[0002]

2. Description of the Related Art For example, a temperature limit is set for a heating element such as a CPU to ensure proper operation. However, since the temperature limit of an actual chip varies, the temperature limit is set at the time of mounting on an actual device. It is necessary to test whether it works properly within the range.

Conventionally, this temperature characteristic test is performed by detachably mounting a heating element as a device under test on an evaluation board, operating the heating element according to a predetermined test program, and judging the result. . A large heat sink is attached to the heat generating element so as not to exceed the limit temperature, and the heat sink is cooled by an appropriate cooling fan.

[0004]

However, in the above-described conventional example, the heat-generating element after the test needs to be flowed to the next step without the heat sink attached or returned, so that the heat sink generates heat. Workability is extremely poor due to the fact that the heat sink must be detachably attached to the element, the heat sink is large, and the temperature measuring means such as a thermocouple must be attached every time the heating element is replaced. There is a disadvantage that.

[0005] Further, since the heating value of the heating element varies, it is necessary to adjust the output of the cooling fan in order to maintain the temperature of the heating element at a predetermined limit temperature.
There is a limit in adjusting the cooling capacity by adjusting the power supplied to the cooling fan, and it is difficult to strictly manage the temperature conditions, so that there is a disadvantage that the test accuracy is poor.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned drawbacks, and has as its object to provide a thermal test apparatus for a heating element having good test workability and high test accuracy.

[0007]

According to the present invention, an object of the present invention is to provide an apparatus for testing the heat resistance of a heating element 1 for testing the heat resistance of the heating element 1, wherein the heating element 1 can be removably mounted. An evaluation board 2 capable of evaluating the operation of the heating element 1 by a test program, a heat transfer plate 3 provided to be detachably mounted in contact with a heat radiation surface of the heating element 1, and a temperature measuring means of the heating element 1 4, a vortex tube 5 for injecting a low-temperature cooling air to the heat transfer plate 3, and an adjusting unit 6 for adjusting the amount of compressed air supplied to the vortex tube 5. You.

In the present invention, the thermal test is performed on the evaluation substrate 2
After mounting the heating element 1 to be tested, a predetermined test program is run to evaluate whether or not the heating element 1 operates as specified without thermal runaway or the like. Vortex tube 5 for heat test
The test is performed while cooling the heating element 1 by the low-temperature cooling air jetted from the heater.
The temperature is adjusted by the adjusting unit 6 when the values do not match.

Therefore, in the present invention, since the vortex tube 5 has a large cooling capacity as compared with the cooling fan, the desired cooling capacity can be exhibited without increasing the size of the heat transfer plate 3. As a result, the test efficiency is improved because the work of attaching and detaching a large heat sink is not required for the test as in the related art.

Further, since the jet from the vortex tube 5 has a low temperature, the cooling capacity can be easily changed by changing the jet amount of the jet. For this reason, it is easy to maintain the temperature of the heating element 1 at a constant value by changing the amount of blown-out cold air according to the temperature of the heating element 1, and it is possible to improve the test accuracy.

In this case, the muffler 11 having the second expansion chamber 10 formed between the inner case 8 forming the first expansion chamber 7 and the outer case 9 surrounding the inner case 8 is provided in the vortex tube 5. When mounted, the noise from the rising tech tube can be reduced, and the working environment can be improved.

When the length of the low-temperature cooling air in the blowing direction of the muffler 11 is set to an integral multiple of the wavelength of the highest frequency of the noise generated by the vortex tube 5, the muffling performance of the muffler 11 is further improved. Can be.

Further, in the first expansion chamber 7, an impact sound reducer 12 composed of a cone whose top is directed to the inlet 11a of the low-temperature cooling air from the vortex tube 5, or Inside, a sub-expansion chamber 13 with a bottom for introducing the low-temperature cooling air from the vortex tube 5 first and having an exhaust hole 13a on the side wall is arranged,
The noise reduction effect can be further enhanced by arranging, on the bottom wall of the sub-expansion chamber 13, the impact sound reducer 12 composed of a cone whose top is directed to the inlet 11 a of the low-temperature cooling air from the vortex tube 5. .

[0014]

1 to 3 show an embodiment of the present invention. In the figure, 14 is a motherboard of a control unit not shown,
Reference numeral 2 denotes an evaluation board on which the heating element 1 as a device under test is mounted. A socket 2a is fixed to the evaluation board 2 so that the heating element 1 can be detachably mounted. As shown in FIG. 2, an auxiliary plate 15 is mounted on the evaluation substrate 2, and the heat transfer plate 3 can be mounted by a stud 15 a erected from the auxiliary plate 15.

As shown in FIG. 2 (b), the heat transfer plate 3 is a rectangular plate having four studs 15a formed with through holes 3a at four corners, and is formed of a material having good heat conductivity such as aluminum. You. A thermocouple (temperature measuring means 4) is fixed at the center of the heat transfer plate 3, more precisely, at a position corresponding to the heat generation center of the heating element 1, and is connected to a monitor (not shown).

Reference numeral 5 denotes a vortex tube which separates the calorie of the compressed air while forming a high-speed swirling flow by the compressed air supplied from a compressed air supply unit 16 such as a compressor or a high-pressure cylinder. To exhaust the hot exhaust stream from the other.
In order to adjust the exhaust flow rate, a flow control valve (adjustment section 6) is arranged between the compressed air supply section 15 and the vortex tube 5.

A silencer 11 is connected to a low-temperature exhaust port of the vortex tube 5 via a hose.
b, an outer case 9 fixed to the top plate 11 b, and an inner case 8. The inner case 8 causes the first expansion chamber 7 to move between the outer case 9 and the inner case 8. 10 are formed. In order to reduce the manufacturing cost, the inner case 8 and the outer case 9 can be manufactured by pressing a sheet metal, and an anti-vibration rubber 17 is interposed between the top plate and the inner and outer cases 9. In order to enhance the noise reduction effect,
The length (L) of the silencer 11 in the exhaust flow direction is set to an integral multiple of the wavelength of the most frequent component of the noise emitted from the vortex tube 5.

The low-temperature exhaust gas from the vortex tube 5 is introduced into the first expansion chamber 7 from a nozzle (introduction port 11b) formed in the top plate 11b, and rapidly flows when being introduced into the first expansion chamber 7. The cross-sectional area of the road is increased, and a part of the flow goes to the second expansion chamber 10 from the discharge port of the inner case 8, so that the pressure is reduced, so that the noise at the time of blowing the cool air from the cool air outlet is reduced. Exhaust port 9a of outer case 9
Is discharged from As shown in FIG. 3B, a curvature surface is formed near the exhaust ports 8a, 9a of the inner case 8 and the outer case 9 so as to reduce the discharge loss. Further, an opening 10 a for opening the second expansion chamber 10 to the outside air is provided at the upper part of the wall surface of the outer case 9, so that the outside air is supplied into the second expansion chamber 10. Further, a hygroscopic material such as silica gel is attached to the wall surfaces of the first expansion chamber 7 and the second expansion chamber 10 to prevent dew condensation on the heat transfer plate 3 or the surface of the evaluation substrate 2 due to a cool air jet. Is done.

FIG. 4 shows a modification of the muffler 11. In addition,
In the following description of the modified example, components that are substantially the same as those in the above-described embodiment are given the same reference numerals in the drawings, and description thereof is omitted. In this modification, in the first expansion chamber 7,
A bottomed cylindrical auxiliary expansion chamber 13 is provided. Sub expansion chamber 13
An exhaust hole 13a is opened in the side wall of the vortex tube 5, and the low-temperature exhaust gas from the vortex tube 5 is once introduced into the sub-expansion chamber 13 and expanded, then guided to the first expansion chamber 7, and further expanded.

In this case, the bottom wall of the sub-expansion chamber 13 is
As shown in (b), it is desirable to provide an impact sound reducing body 12. The impact sound reducing body 12 is a vortex tube 5
It is a cone or a pyramid whose top is directed to the inlet 11a from the bottom, and a concave curved surface 12a is formed below the hypotenuse.
By arranging the impact sound reducing body 12, since the collision of the low-temperature exhaust gas with the flat surface is prevented, the generation of noise due to the collision can be prevented.

Incidentally, the impact sound reducing body 12 shown in FIG.
As shown in (b), even when the sub-expansion chamber 13 is not provided, the generation of the impact sound can be reduced by holding the sub-expansion chamber 13 at an appropriate position.

Therefore, in this embodiment, when conducting a thermal test of the heating element 1, first, the heating element 1 is mounted on the socket 2 a of the evaluation board 2, and further, the bottom surface contacts the heat sink surface of the heating element 1. Thus, the heat transfer plate 3 is fixed with the nut 18.

After that, the control valve 6 is opened, compressed air is sent from the compressor 16 to the vortex tube 5, and the test program is run while cooling the heating element 1 by the low-temperature exhaust flow from the vortex tube 5, and the test program is run. Evaluate the response signal. The temperature of the heating element 1 is monitored by a monitor (not shown). When the temperature becomes higher than a predetermined experimental temperature, the regulating valve 6 is opened to increase the amount of low-temperature cold air blown out. To adjust the temperature.

The temperature can be adjusted by automatically adjusting the adjustment valve based on the output of the thermocouple.

[0025]

As is apparent from the above description, according to the present invention, a high-precision thermal test can be performed while improving the test workability and keeping the temperature condition constant.

[Brief description of the drawings]

FIG. 1 is a diagram showing the present invention.

FIG. 2 is a view showing a substrate for evaluation, (a) is a side view,
(B) is a plan view of the heat transfer plate.

3A and 3B are views showing a silencer, wherein FIG. 3A is a cross-sectional view, and FIG. 3B is an enlarged view of a main part of FIG.

FIG. 4 is a view showing a modification of the silencer, in which (a) is a sectional view,
(B) is a side view of the impact sound reducing body, (c) is a sectional view showing another modification.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Heating element 2 Evaluation board 3 Heat transfer plate 4 Temperature measuring means 5 Vortex tube 6 Adjustment part 7 First expansion chamber 8 Inner case 9 Outer case 10 Second expansion chamber 11 Silencer 11a Inlet 12 Impact sound reducer 13 Secondary Expansion chamber 13a Exhaust hole

Claims (5)

[Claims] An evaluation board for testing the heat resistance of a heating element, wherein the heating element can be removably mounted and the operation of the heating element can be evaluated by a predetermined test program. A heat transfer plate that is detachably mounted in contact with the heat dissipating surface of the heating element; a temperature measuring means for the heating element; a vortex tube for injecting low-temperature cooling air to the heat transfer plate; A thermal test device for a heating element having an adjusting unit for adjusting the amount of air. 2. The vortex tube according to claim 1, further comprising a muffler having a second expansion chamber formed between an inner case forming a first expansion chamber and an outer case surrounding the inner case. Heating device thermal test equipment. 3. The thermal testing device for a heating element according to claim 2, wherein the length of the low-temperature cooling air in the blowing direction of the muffler is an integral multiple of the wavelength of the highest frequency of the noise generated by the vortex tube. 4. The heat of the heating element according to claim 2, wherein an impact sound reducer comprising a cone whose top is directed to an inlet of the low-temperature cooling air from the vortex tube is disposed in the first expansion chamber. Testing equipment. 5. The bottom of the first expansion chamber, in which low-temperature cooling air from a vortex tube is first introduced, and
A sub-expansion chamber having an exhaust hole on the side wall is arranged, and an impact sound reducing body composed of a cone with the top directed to the inlet of the low-temperature cooling air from the vortex tube is arranged on the bottom wall of the sub-expansion chamber. 4. A thermal test apparatus for a heating element according to claim 2, wherein