JPH02186243A - Thermal shock tester - Google Patents

Abstract

PURPOSE:To eliminate waste of energy during a preparatory operation and during a cycle operation by calculating required time of a preparatory heating operation and a preparatory cooling operation based on a target high temperature, a target low temperature and the current temperature to determine a starting time of the preparatory heating operation and the preparatory cooling operation. CONSTITUTION:A preparatory operation time calculating means 6 calculates time required for a preparatory heating operation and time required for preparatory cooling operation from a target high temperature, a target low temperature and the current temperature. A preference operation judging means 7A compares a preparatory cooling operation time with a preparatory heating operation time and a high temperature exposure time and outputs a heating preference signal or a cooling preference signal depending on the results. On the other hand, an operation control means 8A works to perform the preparatory heating operation by the heating preference signal and to perform the preparatory cooling operation by the cooling preference signal.

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention tests the degree of resistance of various parts to thermal shock in an environment where there is a large temperature difference between high and low temperatures. The present invention relates to improvements in thermal shock testing equipment used for testing.

(Prior Art) This type of testing device is known from Japanese Patent Application Laid-Open No. 73752/1984, and is widely used for performance testing of electrical and electronic components.

As can be seen in the above-mentioned known example, the thermal shock test device is equipped with three tanks: a test tank, a high temperature tank, and a low temperature tank. A repeated operation (hereinafter referred to as cycle operation) in which the cycle operation is reversed is carried out, but before the start of this cycle operation, a preparatory operation is carried out in which both the high-temperature bath and the low-temperature bath are heat-treated to the target temperature. It goes without saying that management of this preparatory operation is also an important element in order to improve test operation efficiency.

(Problem to be Solved by the Invention) By the way, in order to perform a cycle operation after the completion of the preparatory operation, the preparatory heating operation time (t□) until the high temperature tank reaches the target high temperature (TH), and the Depending on the relationship between the preparatory cooling operation time (tL, ) to reach the temperature (TL), the unit time of exposing the test chamber to high temperature during cycle operation ((□), and the unit time of exposing it to low temperature (tLP - tL), the preparatory operation may be delayed. The energy consumed for heat treatment during medium or cycle operation is wasted, and the time for preparatory operation is wasted.

For example, specifically, cycle operation is preceded by high temperature exposure operation, and tHP≦tLP, and 1L≦t
In cases where the NP + tH condition is met, high-temperature exposure operation can be started when the high-temperature bath reaches the target high temperature (T), but when the low-temperature bath reaches the target low temperature (T)
Since it is common practice to continue the preparatory operation until the preparatory operation reaches t, as shown in Fig. 6, there is a waste of time for tcp-tNP during the preparatory operation. There is a waste of thermal energy consumed in the high temperature bath after the high temperature bath reaches the target high temperature (1,), and a part of the thermal energy consumed in the low temperature bath during high temperature exposure operation is also wasted. The overall problem was that the operating time was long, and the economical efficiency of operation was reduced due to the loss of thermal energy.

In addition, maintaining the temperature of the high temperature bath during low temperature exposure operation when it is sufficiently long compared to TL7><hp leads to waste of energy, and furthermore, when t8 is sufficiently long compared to tLF, high temperature exposure operation Some of the energy spent on maintaining the temperature of the cryostat will be wasted.

In view of these problems, the present invention has established an operation system that can eliminate waste of preparatory time and waste of energy during preparatory operation and cycle operation, and improve operational efficiency. The objective is to improve the performance and operating economy of the vehicle.

(Means for Solving the Problems) In order to achieve the above object, the present invention, as is clear from the embodiments shown in the accompanying drawings, provides a test chamber (1), a test M A high-temperature tank (2) and a low-temperature tank [3] are respectively arranged so as to be able to communicate with and shut off the tank (1), and a heating device for heating the high-temperature tank (2) (
4), a cooling device (5) for cooling the low temperature tank (3), and the high temperature tank (2) and the low temperature tank (3) are heated to a target high temperature (TH).
) and a preparatory cooling operation in which heat treatment is performed in advance to a target low temperature (TL), and then a high temperature tank (2) and a low temperature tank (3) are heated to a target high temperature (TH) and a target low temperature (Tt).
), and the high temperature bath (2) and low temperature bath (3) are alternately applied to the test chamber (1) using the high temperature exposure time (t+r) and low temperature exposure time (tL) as unit time. In a thermal shock test apparatus that performs a cycle operation consisting of a high-temperature exposure operation and a low-temperature exposure operation that are connected to each other, and a cycle operation that is preceded by the high-temperature exposure operation, the time required for each of the preparatory heating operation and the preparatory cooling operation (
(tLP) based on the target high temperature (TH), target low temperature (TL), and current temperature (T); and the preparatory cooling operation time (tLP). compared with the preparatory heating operation time (tHP) and high temperature exposure time (tH),
LLP≧tMP and ttp≦tllF+ t, l
or if tLF < tllF, a heating priority signal is output, and if tLP≧tllF and LP>t
If Hr + L, I, a priority operation determining means (7A) outputs a cooling priority signal, and when the heating priority signal is output, a preparatory heating operation is performed immediately, and a preparatory cooling operation is performed by comparing the difference time (△tt = hr
+ t++ -ttr), and furthermore, the cycle operation is performed as the preparatory heating operation time (tHP) elapses, while the preparatory cooling operation is performed immediately when the cooling priority signal is output. The preparatory heating operation is performed as the comparison difference time (ΔtH=ttp tHrLM) elapses, and the cycle operation is performed according to the difference between the preparatory cooling operation time (tLP) and the high temperature exposure time (t, l). Operation control means (8A
).

Next, the invention of claim 2 is distinguished from the invention of claim 1 in that the low-temperature exposure operation is preceded in the cycle operation, and the preferential operation determination means (78) is configured such that the heating operation time (
t□) with the preparatory cooling operation time (tLr) and low temperature exposure time (tL).
．． If ≦tLP+tL or t□<tcp, a cooling priority signal is output, and if tHP≧ttr and L
If sP > ttp +LL, the configuration is such that a heating priority signal is output, and further, when the cooling priority signal is output, the operation control means (8B) immediately performs the preparatory cooling operation, and performs the preparatory heating operation with a comparative time difference. (△tH=tLr+k
Further, the cycle operation is performed as the preparatory cooling operation time (tLP) elapses, while the preparatory heating operation is performed immediately when the heating priority signal is output. , the preparatory cooling operation is performed with the passage of the comparison difference time (ΔLL = t□-tt, p-tt), and the cycle operation is further performed with the preparatory heating operation time (tHP) and the low temperature exposure time (tL). The feature that distinguishes this from the invention of claim 1 is that the process is performed as time passes corresponding to the difference in .

(Function) Claim 1 is based on the length relationship between the preparatory heating operation time (to) and the preparatory cooling operation time (tt, p), and further from the respective values of the high temperature exposure time (LH) and the low temperature exposure time (t, ). It is possible to set the starting points of the preparatory heating operation and the preparatory cooling operation so that appropriate conditions can be met by the operation of the priority operation determining means (7A) and the operation control means (8A). Therefore, the high temperature tank (2) reaches the target high temperature CTs
), the cycle operation from the high temperature exposure operation is started, and the low temperature chamber (3) reaches the target low temperature (TL) at the same time as the high temperature exposure operation ends, which is too early. Alternatively, it is possible to switch to low-temperature exposure operation without too much delay.

On the other hand, as for claim 2, the only difference from claim 1 is that the order of the cycle operation is that the low temperature exposure operation is preceded, and similarly, the timing of the preparatory cooling operation and the preparatory heating operation can be taken appropriately, so that the cycle You can smoothly transition to driving.

In this way, the preparation time is reduced to a minimum, and
It is possible to minimize energy loss.

(Example) Hereinafter, an example of the present invention will be described based on the accompanying drawings.

In FIG. 1, +1) is a test tank whose peripheral wall is made of a heat insulating material, and various parts to be subjected to a thermal shock test are housed in the tank through a door (9).

(2) and (3) are a high temperature tank and a low temperature tank that are disposed close to each other on both sides of the test tank +1), and their peripheral walls are formed of a heat insulating material.

The test chamber (1) and the high temperature chamber (2) have two air flow passages.
Groan.

The test chamber (1) and the cryostat (3) are connected through two air flow passages 03.
Q3), and each of the flow passages OI~α is provided with a damper 0~ having heat insulating properties.
0η are interposed so that the flow passages can be opened and closed.

Note that (22) and (23) are an air supply damper and an exhaust damper provided in the supply and exhaust passages, respectively.

In the high temperature tank (2), a heating device (4) such as an electric heater and a hot air fan 12 are housed, while in the low temperature tank (3), a freezing unit 7) α The evaporator O1 of the cooling device (5) formed by the evaporator and the evaporator OI
and a cold air fan (21), and a high temperature tank (
2), for example, 17 by heating operation of the electric heater (4).
A 0°C atmosphere is created, and the low temperature chamber (3) is equipped with a cooling device (5
) A cooling operation of, for example, creates an atmosphere of -60°C.

The gas phase thermal shock test apparatus having the structure described above first operates the heating device (4) and the cooling device (5), and connects the high temperature chamber (2) and the low temperature chamber (3) to the test chamber ( Target high temperature (TH = 170℃) under thermally isolated conditions for 1)
and the target low temperature (TL=-60°C).
Allow to cool.

This heating and cooling operation is called a preparatory heating operation and a preparatory cooling operation.

After the above operation is completed, the temperature of the high temperature tank (2) is 170℃, and the temperature of the low temperature tank (
When 3) reaches -60°C, it shifts to cycle operation, but
This cycle operation is performed by opening the dampers ae and as, and by operating a hot air fan (2 fans) to connect the test tank (11 and the high temperature tank (2)). High-temperature exposure operation to raise the temperature to ℃, open damper α1.Qη, and cool air fan (21)
This consists of a low-temperature exposure operation in which the inside of the test chamber (1) is brought into communication with the low-temperature chamber (3) to lower the temperature to a low temperature, for example, -40°C.

In this case, the cycle operation is such that either the high-temperature exposure operation or the low-temperature exposure operation is preceded as necessary, and the high-temperature exposure time (1*) and the low-temperature exposure time (t,) are alternately repeated as a unit time. This is done several times.

The thermal shock test operation described above was performed using the central processing unit (CPU).
) is automatically performed after the operation command is given manually by the control system that includes the elements (6) and (7). , ) or (7,) and the operation control means (8A) or (
86) to form a control system.

First, the preparation operation time calculation means (6) is configured to take in external data, exchange data with the memory, perform necessary arithmetic processing, and then output the processed data. , the time required for the preparatory heating operation (tllF) and the time required for the preparatory cooling operation (kr) are calculated from the target high temperature (Tll), the target low temperature (TL), and the current temperature (T).

In this case, the preparatory heating operation time (txr) is the heating device (
4) consists of an electric heater, the target high temperature (TL
) If the temperature is up to about 200℃, tHp=
aT,, + b...(A) However, a and b are constants, and can be determined by the -order formula.

On the other hand, in the case where the cooling device (5) is composed of a compression refrigeration device, the preparatory cooling operation time (by) is -C, TL tLp= e +C□・ ・ ・ ・ ・(
B) However, C, and CZ are constants, and can be determined by an exponential function of.

Therefore, by storing in the memory a graph representing the formula (A) (see Figure 4) and the formula (B) (see Figure 5), the operating time (thp), (
tLP) can be calculated.

Next, the preferential operation determination means (7A) is an arithmetic circuit comprising a summation element and a comparison element, and is applied to those in which cycle operation precedes high-temperature exposure operation, and preparatory cooling The operating time (tLP) is compared with the preparatory heating operating time (to) and the high temperature exposure time (t8), and a heating priority signal or a cooling priority signal is output based on the results.

Comparison calculations in this case are performed in three different ways: First, the length of the preparatory cooling operation time (tt, r) and the preparatory heating operation time (to) is compared, and LL is calculated.

If < tNr, a heating priority signal is output to advance the preparatory heating operation, while if LLP≧t)IF, the preparatory cooling operating time (tLP) is further set to the preparatory heating operating time (t□) and the high temperature. Compared with the sum of the exposure time (tH), if tLr≦tNF+tit, the heating priority signal for preceding the preparatory heating operation is output, and tLp
> ttp + h, preparatory cooling operation is preceded,
Outputs a cooling priority signal to

On the other hand, the operation control means (8A) is an output circuit formed from an electronic timer element and an output transistor, and by outputting the heating priority signal, the heating value W
(4) and 7179 hours for hot air are activated, a preparatory heating operation is performed immediately, a delayed cooling device (5) and a cooling fan (21) are activated, a preparatory cooling operation is performed, and a further delay is performed for high temperature exposure. The device is configured to perform a cycle operation that precedes the operation, and is configured to operate in the order of preparatory cooling operation, preparatory heating operation, and cycle operation by outputting the cooling priority signal. It is.

Therefore, the timing of sequential operation is performed at the capacity described below.

That is, when the heating priority signal is output, the preparatory heating operation is started immediately, and then the time from the start point to the end of the high temperature exposure operation (111, + 1□)
When the comparative difference time (△1.=1Hde+1.-1LP), which is obtained by subtracting the preparatory cooling operation time (tLP), has elapsed, the preparatory cooling operation is started, while the preparatory heating operation time (tNP) has elapsed from the start point. When the high temperature tank (2) reaches the target high temperature (T1F 0℃), damper Q4), Q
! 9 is opened to start high temperature exposure operation.

After that, damper 04J, α~ is exposed to high temperature for a time (t).

) When opened, damper 00. αη is the low temperature exposure time (
tL) and then repeat this process to continue the cycle operation. Thus, the high temperature tank (2) and the low temperature tank ( 3) will reach a predetermined target temperature.

On the other hand, if the cooling operation signal is output, the preparatory cooling operation is started immediately, and then the preparatory cooling operation time (
Comparison difference time (△tH=
When tLp tHp tH) elapses, the preparatory heating operation is started, and on the other hand, the cycle operation is started when the time obtained by subtracting the high temperature exposure time (tH) from the preparatory cooling operation time (tLP) has elapsed.

The mode of operation described above is as shown as a time course diagram in FIG.

By the way, regarding the invention of claim 2 which is applied to the case where the cycle operation is executed by preceding the low temperature exposure operation, the operation of the priority operation determination means (7,) and the operation control means (8,) is performed in the low temperature exposure operation and the high temperature exposure operation. The basic form of control remains the same, only that it is different according to the difference in the order of.

That is, the priority operation determination means (7m) converts between the heating priority signal and the cooling priority signal, and determines the preparation cooling operation time (tt, r) and the preparation heating operation time (t
Hp), high temperature exposure time (tN) and low temperature exposure time (
Appropriate priority operation can be determined by replacing the preparatory heating operation time (tNr), preparatory cooling operation time (tLr), low temperature exposure time (11), and high temperature exposure time (tH) with respect to tL). be.

On the other hand, the operation control means (8m) is also changed in the same manner as the priority operation determination means (7□), and is also read as preparatory heating operation and preparatory cooling operation in the same manner. This enables effective operation control.

An example of operation in this case is shown in Figure 3. In this example, the high temperature exposure time (to) is 1 hour, the temperature of the test chamber +1) is 150°C, and the low temperature exposure time (tL 'J) is 2 hours. The temperature of the test chamber (11) was 140℃, and it took 0.5 hours to raise the temperature of the high temperature chamber (2) from room temperature to the target high temperature (T1F 0℃). (3) This is the case of an apparatus that requires one hour to lower the temperature from room temperature to the target low temperature (↑L=60°C).

As mentioned above, each example has been explained, but in the cycle operation, the low temperature exposure time (11) is the preparatory heating operation time (to
r) or when the high temperature exposure time (tH) is sufficiently long compared to the cooling operation time (tLP), the temperature of the high temperature tank (2) or low temperature tank (3) is maintained. Of course, there is no problem even if the operation is temporarily interrupted and heating or cooling is restarted at an appropriate point.
It is also possible to have the control system determine which of the high-temperature exposure operation and the low-temperature exposure operation should be carried out first.

(Effects of the Invention) In both claims 1 and 2 of the present invention, at the time when the first high temperature exposure operation and low temperature exposure operation in the cycle operation are performed, the high temperature bath (2) and the low temperature bath (3) are operated at this point. Target high temperature to match timing (Ding Yi)
Since the preparatory heating operation and the preparatory cooling operation are performed to reach the target low temperature (TL), heating and cooling are neither too slow nor too early, and therefore, wasted preparation operation time is eliminated. At the same time, it becomes possible to maintain the test temperature accurately as designed, making it possible to optimize preparatory operations and effectively utilize heat energy by eliminating waste throughout the entire operation period.

[Brief explanation of the drawing]

FIG. 1 is a schematic structural diagram according to an embodiment of the present invention, FIG. 2 is an operation time chart according to the example of claim 1, and FIG. 3 is an explanatory diagram of the operating state according to the example of claim 2. 4 and 5 are a preparatory heating temperature-time relation diagram of the high temperature tank and a preparatory cooling temperature-time relation diagram of the low temperature tank, and FIG. 6 is an operation time chart of the conventional apparatus. (11...Test tank, (2)...High temperature tank, (3)...
...Cold temperature tank, (4)...Heating device, (5)...Cooling device, (6)...Preparation operation time calculation means, (7A
), (71)...priority operation determination means, (8A), (
8m'')...Operation control means, (D)...Current temperature, (TH)...Target high temperature, (TL)...Target low temperature, (tH)...High temperature exposure time, ( 11)...Low temperature exposure time, (tHp)...Preparation heating operation time, (tLP)...Preparation cooling operation time, Fig. 1

Claims (1)

[Scope of Claims] 1. A test tank (1), a high temperature tank (2) and a low temperature tank (3) which are respectively arranged so as to be able to communicate with and shut off the test tank (1), the high temperature tank ( 2) a heating device (4) for heating the
A preparatory heating operation that includes a cooling device (5) that cools the low temperature tank (3) and heat-treats the high temperature tank (2) and the low temperature tank (3) to a target high temperature (T_H) and a target low temperature (T_L) in advance; A preparatory cooling operation is performed, and then the high temperature tank (2) and the low temperature tank (3) are heated to the target high temperature (T_H) and the target low temperature (T_H).
A heating operation and a cooling operation are performed in which the test chamber (1) is alternately operated in the high temperature chamber (2) and the low temperature chamber (3) using the high temperature exposure time (t_H) and the low temperature exposure time (t_L) as unit times. In a thermal shock test apparatus that performs a cycle operation consisting of a high-temperature exposure operation and a low-temperature exposure operation that are connected to a high-temperature exposure operation, and a cycle operation that is preceded by a high-temperature exposure operation, the time required for each of the preparatory heating operation and the preparatory cooling operation (
t_H_P), (t_L_P) as the target high temperature (T_H)
and a preparation operation time calculation means (6) that calculates the preparation operation time based on the target low temperature (T_L) and the current temperature (T), and the preparation cooling operation time (t_L_P) is calculated based on the preparation heating operation time (t_H_P) and the high temperature exposure time. (L_H), t_L_P≧t_H_P and t_L_
P≦t_H_P+t_H or t_L_P<t
If _H_P, a heating priority signal is output, and t_L_P≧
t_H_P, and t_L_P>T_H_P+t_N
If so, the priority operation determining means (7) outputs a cooling priority signal.
_A) When the heating priority signal is output, the preparatory heating operation is performed immediately, and the preparatory cooling operation is performed for a comparison difference time (Δt_L=t_H
_P+t_H-t_L_P), and furthermore, the cycle operation is performed as the preparatory heating operation time (t_H_
P), while when the cooling priority signal is output, the preparatory cooling operation is performed immediately, and the preparatory heating operation is performed for the comparative difference time (Δt_N=t_L_P−t_H_P−
an operation control means (8_A) for causing the cycle operation to be performed as time elapses over time (t_H), and further causing the cycle operation to be performed as time elapses corresponding to the difference between the preparatory cooling operation time (t_L_P) and the high temperature exposure time (t_N); A thermal shock test device characterized by being provided with. 2. A test tank (1), a high temperature tank (2) and a low temperature tank (3) which are respectively arranged so as to be able to communicate and cut off the test tank (1), and heating for heating the high temperature tank (2). device (4),
A preparatory heating operation that includes a cooling device (5) that cools the low temperature tank (3) and heat-treats the high temperature tank (2) and the low temperature tank (3) to a target high temperature (T_H) and a target low temperature (T_L) in advance; A preparatory cooling operation is performed, and then the high temperature tank (2) and the low temperature tank (3) are heated to the target high temperature (T_H) and the target low temperature (T_H).
A heating operation and a cooling operation are performed in which the test chamber (1) is alternately operated in the high temperature chamber (2) and the low temperature chamber (3) using the high temperature exposure time (t_H) and the low temperature exposure time (t_L) as unit times. In a thermal shock test apparatus that performs a cycle operation consisting of a high temperature exposure operation and a low temperature exposure operation that are connected to each other, and a cycle operation that is preceded by a low temperature exposure operation,
t_H_P), (t_L_P) as the target high temperature (T_H)
and a preparation operation time calculation means (6) that calculates the preparation operation time based on the target low temperature (T_L) and the current temperature (T), and the preparation heating operation time (t_H_P) is calculated based on the preparation cooling operation time (t_L_P) and the low temperature exposure time. (t_L), t_H_P≧t_L_P, and t_H_
P≦t_L_P+t_L or t_H_P<t
If _L_P, a cooling priority signal is output, and t_H_P≧
t_L_P, and t_H_P>t_L_P+t_L
If so, the priority operation determining means (7) outputs a heating priority signal.
_B) When the cooling priority signal is output, the preparatory cooling operation is performed immediately, and the preparatory heating operation is performed for a comparison difference time (ΔT_H=t_L
_P+t_L-t_H_P), and furthermore, the cycle operation is performed as the pre-cooling operation time (t_L_
P), while when the heating priority signal is output, the preparatory heating operation is performed immediately, and the preparatory cooling operation is performed for the comparison difference time (Δt_L=t_H_P−t_L_P−
an operation control means (8_B) for causing the cycle operation to be performed as time elapses over time (t_L), and further causing the cycle operation to be performed as time elapses corresponding to the difference between the preparatory heating operation time (t_H_P) and the low temperature exposure time (t_L); A thermal shock test device characterized by being provided with.