JP3102652B2 - Thermal shock test equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a thermal shock test apparatus, and more particularly to a thermal shock test apparatus suitable for repeatedly performing cooling and heating tests on an integrated circuit.

[0002]

2. Description of the Related Art A thermal shock test apparatus of this type is, for example, disclosed in Japanese Patent Application Laid-Open No. 62-125230, a binary refrigeration cycle, an evaporator and a re-evaporator constituting the binary refrigeration cycle. A cold room in which the heater is housed,
A high-temperature room in which the heater is housed, a test room connected to the low-temperature room and the high-temperature room, and a low-temperature room and a high-temperature room are arranged between them in order to selectively communicate with the test room. Means. In the test, the air temperature in the low-temperature room was pre-cooled to a temperature lower than the test temperature by a binary refrigeration cycle, and the air in the high-temperature room was pre-heated to a temperature higher than the test temperature by a heater. This is done by alternately sending hot air from the cold air and hot air into the test room, and exposing the sample in the test room to these cold air and hot air.

[0003]

In such a thermal shock test apparatus, generally, the refrigeration capacity of a binary refrigeration cycle is adjusted to the minimum test temperature required for a low-temperature impact test.
When performing a test at a low-temperature impact test temperature at a higher temperature, cooling by a binary refrigeration cycle and heating by a reheater are performed together to maintain the test temperature, so that a large amount of energy is consumed. Is wasting.

[0004] For example, a low-temperature impact test has a minimum test temperature of -1.
When the test is performed at 0 ° C. and the maximum test temperature of −65 ° C., the pre-cooling temperature of the low-temperature chamber when performing the low-temperature impact test at the minimum test temperature of −10 ° C.
Although it depends on the structure of the thermal shock test equipment, the temperature of the refrigerant flowing through the evaporator is -25 ° C or -20 ° C to -30 ° C.
To -30 ° C. In addition, the maximum test temperature -65 °
When the low-temperature impact test is performed at C, the pre-cooling temperature of the low-temperature chamber is -75 ° C to -80 ° C, and the refrigerant temperature in the evaporator is -80 ° C to -85 ° C. Conventionally, when a cold shock test device performs a low-temperature shock test at the maximum test temperature at this refrigerant temperature, the amount of circulating refrigerant becomes too large, and the refrigerating capacity becomes excessive. In addition to the operation, the cold air in the low-temperature chamber is heated by the reheater to maintain the above-mentioned pre-cooling temperature, thereby canceling out the excess refrigeration capacity.

[0005] It is an object of the present invention to provide an improved thermal shock test apparatus which not only saves energy but also can stably operate a binary refrigeration cycle.

[0006]

In order to achieve the above object, a thermal shock test apparatus according to the present invention provides a test for placing a sample.
A chamber, a heater, and the heat heated by the heater
A high-temperature chamber equipped with a heat storage material and a blower,
The heat exchanger on the low-temperature side of the cycle and cooled by this heat exchanger
Reheater that heats the heat storage material that stores heat and the cooled air
And a low-temperature chamber provided with a blower, the test chamber and the high-temperature chamber
And a plurality of passages connecting the test chamber and the cold room;
A plurality of dampers arranged in the test chamber for opening and closing the passage;
And a high temperature that constitutes the heater and the binary refrigeration cycle.
Refrigeration compressors for the side refrigeration cycle and the low-temperature side refrigeration cycle
Operation control for controlling each motor to be driven and the damper
Control means for controlling each of the motors independently.
In the thermal shock test apparatus adapted to perform
The control means starts the high-temperature side refrigeration cycle,
The low-temperature refrigeration cycle is started, and the high-temperature refrigeration cycle is started.
The motor of the refrigeration compressor of the
For the time to increase to the speed associated with the number,
The motor of the refrigeration compressor of the warm side refrigeration cycle is stopped.
To increase the number of revolutions related to the specific frequency from
I try to make it longer .

[0007]

[0008]

[Function] Binary refrigeration for cooling the low-temperature chamber of the thermal shock test equipment
When starting the cycle, start the high-temperature refrigeration cycle first.
And then start the low-temperature refrigeration cycle.
The rotation speed of the motor of the refrigeration compressor in the high-temperature side refrigeration cycle
From its standstill to the speed associated with the particular frequency
Rise time, the low-temperature side refrigeration cycle refrigeration compressor
The number of rotations of the motor is
By increasing the time to increase the rotation speed to
Eliminate sudden changes in load in the scade heat exchanger
Stable operation of refrigeration cycle and stable temperature drop
So that you can do it.

[0009]

[0010]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the thermal shock test apparatus of the present invention will be described below with reference to the drawings.

As shown in FIG. 1, the thermal shock test apparatus includes a test room 10, a high temperature room 11, a low temperature room 12, and a machine room 13.

The high temperature chamber 11 is arranged at the lower part of the test chamber 10, the low temperature chamber 12 is arranged at the upper part of the test chamber 10, and the machine room 13 is arranged at the side of the high temperature chamber and the low temperature chamber. These test rooms, hot and cold rooms are separated by walls and are independent of each other. However, two passages 14 and 15 are provided in a partition wall between the test room 10 and the high-temperature room 11, and two passages 16 and 17 are provided in a partition wall between the test room 10 and the low-temperature room 12. Of the passages, dampers 20 and 21 are disposed in the passages 14 and 15, respectively. Although not shown, these dampers are hinged at one end to a partition wall, are connected to a power source, and rotate the power source by activating the power source from outside the device. Only the passages 14 and 15 or only the passages 16 and 17 can be opened and closed.

A guide plate 22 is provided inside the high temperature chamber 11, and the high temperature chamber 11 is divided into two small chambers by the guide plate. The blower 23 places the impeller at the end connecting these chambers, and
It is installed on the partition wall between the upper and lower compartments, and the circulation in the high-temperature compartment is returned to the upper compartment through the upper compartment, the blower and the lower compartment. High temperature room 11
The dampers 18 and 18a are also arranged in the passage 14.
One end of each of these dampers is also attached to the partition wall by a hinge, and the dampers are connected to a power source, and can be rotated by operating the power source from outside the device. However, the rotation center axis of the damper 18a is
When the dampers 18 and 19 are opened, they open together to close the gap between the lower chamber and the blower 23, and the air from the blower 23 circulates through the test chamber 10, the passage 15, the upper chamber and the blower 23. I can do it. Heater 2
The heat storage material 4 and the heat storage material 25 are located on the air circulation path, are arranged in the upper small chamber, and are supported by the guide plate 22 and the partition wall.

A guide plate 26 is also arranged inside the low-temperature chamber 12, and divides the low-temperature chamber 12 into two small chambers. Blowers 27 are arranged at the ends of these small chambers, and circulate the air inside the low temperature chamber 12 as in the high temperature chamber 11. Then, the damper 20a is disposed in the passage 16,
When opened together with the dampers 20, 21, the space between the upper chamber and the blower 27 is closed, and the air discharged from the blower 27 can circulate through the test chamber 10, the passage 17, the upper chamber, and the blower 27. So that

Evaporator 28, heat storage material 29 and reheater 3
Numeral 0 is arranged in the lower small chamber, is located on these air circulation paths, and is supported by a wall member or the like constituting the low temperature chamber 12. The evaporator 28 forms a part of a binary refrigeration cycle, as described later. Devices such as a refrigerating compressor, a condenser, and an expansion valve, which constitute this binary refrigeration cycle, are housed in a machine room 13 (not shown).

The binary refrigeration cycle, as shown in FIG.
It is composed of a binary refrigeration cycle including a high temperature side refrigeration cycle A1 and a low temperature side refrigeration cycle B1.

The high temperature side refrigeration cycle A1 is a refrigeration compressor 3
1, condenser 32, solenoid valves 33 and 34, expansion valves 35 to 37
And the heat exchanger 38, the low-temperature side refrigeration cycle B1
Is a refrigerating compressor 41, an evaporator 28 incorporated in the low-temperature chamber 12, expansion valves 45 to 47 , solenoid valves 43 and 44, an oil separator 49, a relief valve 40 , an expansion tank 42 , a capillary tube 48, and a heat exchanger. 38. Of these, the heat exchanger 38 comprises a cascade heat exchanger. The relief valve 40 , the expansion tank 42, and the capillary tube 48 are for releasing the pressure to the low pressure side when the pressure of the low temperature side refrigeration cycle B1 increases. Although not shown,
The condenser 32 in the high-temperature side refrigeration cycle has an inlet and an outlet connected to a reheater 30 in a low-temperature room by a branch pipe .

The refrigerating compressors 31 and 41 constituting the high-temperature side refrigerating cycle A1 and the low-temperature side refrigerating cycle B1 have a scroll-type compressor body, and an electric motor for driving the compressor body is an inverter. The electromagnetic valves 33, 34, 43, and 44 are controlled and change the power frequency supplied to the electric motors of the respective compressor bodies.
Is selected to increase or decrease the number of solenoid valves 45 to 47 to be opened, thereby changing the refrigerating capacity.

The operation of the electric motors of the refrigerating compressors 31 and 41 and the opening and closing of the solenoid valves 43 and 44 are controlled by operation control means including a microprocessor together with the operation of the heater 24. The operation control means is shown in FIG. 3 as a whole by the reference numeral 50. The operation control means 51 has a microprocessor, a test temperature setting means 52, a power source driver 53 for opening and closing a damper, and a solenoid valve for opening and closing. The operation means 51 is incorporated in the test temperature setting means 52 and each of the test room 10 , the low temperature room 12, and the heat exchanger 38 according to a program. based of the signal from the temperature sensor 60 to 62 was, and a signal depending on the operating conditions of the device, controls the inverter 63 and 64, the driver 53 of the power source of the damper, the driver 54 and the driver 55 of the heater 24 of the solenoid valve Is output.

The impact test includes dampers 18 and 19 between the test room 10 and the low temperature room 12 and the test room 10 and the high temperature room 1.
1, the dampers 20, 21 are closed, the sample is placed in the test room 10, the binary refrigeration cycle is started, and the low-temperature room 12 is started.
Is started by pre-cooling the air of the high temperature chamber 11 and activating the heater 24. The starting is performed from the high-temperature side refrigeration cycle A1. When the high-temperature side refrigerating cycle A1 is activated, the refrigerant gas from the refrigeration compressor 31 is guided to the condenser 32, condensed by dissipating heat to the outside air or cooling water in the condenser 32. The condensate is supplied to the expansion valve 3
The pressure is reduced at 5-37, enters the heat exchanger 38 and evaporates there and returns to the refrigeration compressor 31. Next, the low-temperature side refrigeration cycle B1 is started by the operation control means 50. When started, the refrigerant gas discharged from the refrigeration compressor 41 is supplied to the heat exchanger 38 by the high-temperature refrigeration cycle A1.
It exchanges heat with the refrigerant and is cooled and condensed. This condensate is
After the pressure in the expansion valves 45 to 47 is reduced, the evaporator 2
8, where it exchanges heat with the circulating air in the low-temperature chamber 12, evaporates, and returns to the refrigeration compressor 41.

In this operation, the operation control means 50
By controlling the respective inverters 63 and 64, the refrigeration compressor 3
The number of rotations of the electric motors 1, 41 is increased or decreased, and the solenoid valves 33, 3
4, 43 and 44 are selected to open the expansion valves 35 to 3
7, 45 to 47 are determined, and the refrigerating capacity is adjusted. That is, when the motor rotation speed is N, the number of poles is P, and the frequency is f, N = (1
20 / p) × f, and the rotation speed of the motor is proportional to the frequency. Therefore, the operation control means 50 is supplied from the inverters 63 and 64 to the motors of the refrigeration compressors 31 and 41 according to the operation state. By changing the frequency of the electric power to increase or decrease the rotation speed of these electric motors, the refrigeration compressors 31, 4
1, the amount of refrigerant discharged changes, and the amount of refrigerant circulated in the high-temperature side refrigeration cycle A1 and the low-temperature side refrigeration cycle B1 is changed. Therefore, the solenoid valves 33, 34,
43 and 44 are selected, and the expansion valves 35 to 37 and 45 to 47 are selected.
By determining the number of refrigerations, the refrigerating capacity can be adjusted.

FIG. 4 shows the temperatures of the test chamber 10, the high-temperature chamber 11 and the low-temperature chamber 12, the frequencies supplied to the motors of the refrigeration compressors 31 and 41 in the high-temperature refrigeration cycle A1 and the low-temperature refrigeration cycle B1. Solenoid valves 33 to 35, 45 for determining the number of expansion valves in the binary refrigeration cycle
47 shows the relationship with the operations of.

The operation control means 50 controls the inverter 63 for the refrigerating compressor 31 in the high-temperature side refrigerating cycle A1 at the time of starting the dual refrigerating cycle, so that the rotational speed of the motor of the refrigerating compressor 31 is related to the frequency of 80 Hz. Raise to the frequency from standstill over about 5 minutes.
When the temperature of the heat exchanger 38 becomes -30 ° C., the operation control means 50 controls the inverter 64 for the refrigeration compressor 41 in the low-temperature side refrigeration cycle B1 according to a signal from the temperature sensor 60 in the heat exchanger 38. Then, the rotation speed of the electric motor of the refrigerating compressor 41 is increased from the stop state to the rotation speed related to the frequency of 80 Hz by about 7 minutes . Sand
Chi, the control of the inverter 63 relative to the refrigerating compressor 31 in the high-temperature side refrigerating cycle A1, the control of the inverter 64 for the refrigeration compressor 41 at a low temperature side refrigerating cycle B1, performed independently, is a two-way refrigeration cycle until the rotational speed of each motor is the rotational speed associated with the frequency 80 Hz, OPERATION is performed at different frequencies
You.

When the dual refrigerating cycle is started, the air in the low-temperature chamber 12 is circulated by the blower 27 inside the low-temperature chamber 12 while the dampers 20, 21, and 21a are closed. Cooled. At this time, the operation control means 50 controls the temperature sensor 61 of the low-temperature chamber 12.
The inverters 63 and 64 are controlled while referring to the signal from the above to increase the refrigerating capacity. When the temperature of the low-temperature chamber 12 becomes -80 ° C., which is lower than the test temperature, the signal from the temperature sensor 61 The hot gas from the refrigerating compressor 31 in the high-temperature side refrigerating cycle A1 is delivered to the reheater 30 to heat the circulating cold air and adjust the temperature of the cold air to a pre-cooling temperature.

On the other hand, when the temperature of the cold air reaches -80 ° C., the operation control means 50 outputs a signal to the driver 53, and the driver 53 operates the power source of the dampers 20, 21, 20a. The dampers 20 and 21 are opened, and the cold room 12 and the test room 10 are opened.
Are connected by the passages 16 and 17, and the damper 21a is opened to shut off the circulation of the cool air in the low temperature chamber 12. The cool air in the low-temperature chamber 12 is blown by the blower 27.
After being sent to the test chamber 10 through the passage 16 and cooling the sample, it returns to the low-temperature chamber 12 through the passage 17,
After the heat exchange in the evaporator 28, the sample is sent again to the test chamber 10, where the sample is cooled, and a low-temperature impact test is performed.

By the time the low-temperature impact test is completed, the air in the high-temperature chamber 11 is heated by the heater 24 to a preheating temperature of 180 ° C. and circulated through the high-temperature chamber 11 by the blower 23. I have. When the low-temperature impact test is completed, the control means 50 outputs a signal to the driver 53, closes the dampers 20, 21, 20a, disconnects the low-temperature chamber 12 from the test chamber 10, and outputs a signal to the driver 54 to output a signal to the high-temperature chamber 11 The power sources of the dampers 18, 19 and 18a are operated, the dampers 18 and 19 are opened, the high temperature chamber 11 and the test chamber 10 are communicated, and the damper 18a is opened to cut off the circulation of the hot air in the high temperature chamber 11. When the high-temperature chamber 11 is connected to the test chamber 10, the hot air in the high-temperature chamber 11 is blown by the blower 23.
The sample is sent from the passage 14 to the test chamber 10 through the passage 14, and after the sample is heated, returns to the high temperature chamber 11 via the passage 15 and is heated by the heater 24, and is sent again from the passage 14 to the test chamber 10; Circulate between the high temperature chamber 11 and the test chamber 10. At this time, the operation control means 50 controls the operation of the heater 24 so as to maintain the temperature of the test chamber 10 at 150 ° C. by a signal from the temperature sensor 62 of the test chamber 10.

During the high-temperature impact test, a pre-cooling operation is performed in the low-temperature chamber 12. Immediately after the low-temperature impact test, the air in the low-temperature chamber 12 has a low-temperature impact test temperature of -65.
It has risen to a temperature close to ° C. Operation control means 50
After the low-temperature impact test, the electromagnetic valves 33, 34, 43, and 44 are opened after the dampers 20, 21, and 20a are closed, and the inverter 63 is operated so that the refrigerating compressors 31, 41 operate at a frequency of 80 Hz. , 64 to rapidly reduce the air in the cold room 12 to a temperature of -80 ° C. Pre-cooling temperature 8
When the temperature reaches 0 ° C., the operation control means 50 inverts the motors of the refrigerating compressors 31 and 41 at a frequency of 30 Hz until the next low-temperature impact test is started.
And control the solenoid valves 33, 64,
By closing 43 and 44, the refrigeration capacity is reduced and energy saving operation is performed.

When the high-temperature impact test is completed, the operation control means 5
0 is the damper 1 between the test room 10 and the high temperature room 11
8, 19, 18a are closed, and the dampers 20, 21, 20a between the test room 10 and the low-temperature room 12 are opened, and the low-temperature room 1 is opened.
The cold air of No. 2 is introduced into the test room 10, and the low-temperature impact test is performed again on the sample, and then the high-temperature impact test is performed. These low-temperature impact test and high-temperature impact test
It is repeated up to the number of times specified for the purpose of the test.

As described above, this thermal shock test apparatus
Preparatory operation is performed on the high-temperature side refrigeration cycle A1 of the binary refrigeration cycle.
Is started, the low-temperature side refrigeration cycle B1 is started at a frequency different from the frequency at which the high-temperature side refrigeration cycle A1 is operating, so that extremely stable operation can be performed. That is, if the inverters 63 and 64 of the high-temperature refrigeration cycle A1 and the low-temperature refrigeration cycle B1 are completely controlled, when the low-temperature refrigeration cycle B1 is started, the refrigeration compressor 31 of the high-temperature refrigeration cycle A1 is already activated.
Because is work moving at a high frequency, low-temperature-side refrigeration cycle
Refrigeration compressor 41 of B1 is started at a high frequency it is operating refrigeration compressor 31 of the high-temperature side refrigerating cycle A1, the load of the heat <br/> exchanger 38 rises sharply, operation unstable However, in this thermal shock test apparatus, the low-temperature side refrigeration cycle B
Since then start the refrigeration compressor 41 1 and at a different frequency refrigeration compressor 31 of the high-temperature side refrigerating cycle A1, there is no abrupt change in the load in the heat exchanger 38, enabling the stable operation and stable temperature drop.

In the cold shock test apparatus of the present invention, not only the preparatory operation of the low-temperature chamber, but also the low-temperature shock test operation and the pre-cooling operation, the inverter for each refrigerating compressor is independently operated in accordance with the operation state. It can also be controlled. That is, as described above, after the operation control means operates each of the refrigeration compressors at different frequencies until the rotation speed reaches the frequency related to the frequency of 80 Hz, the operation control means responds to the operation temperature in the precooling operation and the low-temperature impact test operation. Each with a different frequency change, i.e., an output that differs only in frequency, or an output that has the same frequency but differs only in the time that this frequency is output, or the frequency and output time Different powers are supplied to the invertors for the refrigeration compressors in the low and high temperature refrigeration cycles.
Make it work.

Further, the operation control means controls the operation of the refrigeration compressor of the high-temperature side refrigeration cycle and the low-temperature side refrigeration cycle in each of the preparatory operation, the pre-cooling operation, and the low-temperature impact test operation according to the operation state. Not only do
By controlling the degree of opening of the expansion valve, the operation can be performed with less energy by finely adjusting the refrigerating capacity of the binary refrigeration cycle according to the operating state. FIG. 5 shows such a thermal shock test apparatus. This thermal shock test apparatus differs from the thermal shock test apparatus described with reference to FIGS. 1 to 4 only in the configuration and operation of the binary refrigeration cycle.

The binary refrigeration cycle is constituted by a refrigeration compressor 131, a condenser 132 and a cascade heat exchanger 138 in which an inverter is incorporated in the high-temperature side refrigeration cycle A2.
The low-temperature side refrigeration cycle B2 is constituted by a refrigeration compressor 141 incorporating an inverter, an evaporator 128 and a cascade heat exchanger 138 disposed in a low-temperature chamber. However, the expansion valves in the high-temperature refrigeration cycle A2 and the low-temperature refrigeration cycle B2 have well-known proportional electronic expansion valves 143 whose opening can be continuously adjusted from the outside.
144 and the high temperature side refrigeration cycle A
The condenser 132 in FIG. 2 is provided with a means for adjusting the cooling medium amount. For example, when the condenser 132 is formed of a water-cooled condenser, an electromagnetic valve for adjusting the cooling water amount is provided with an air-cooled condenser. In the case where the cooling fan is provided, a device for changing the rotation speed of the electric motor for driving the cooling fan is provided.

The operation control means 150 is, similarly to the above embodiment, an arithmetic means having a microprocessor, a means for setting a test temperature, a driver for a power source for opening and closing a damper, and a driver for a heater in a high temperature chamber. And a driver for adjusting the degree of opening of the proportional type electronic expansion valves 143 and 144 and a driver for driving the means for adjusting the amount of cooling medium in the condenser 132. In response to the signals from the temperature sensors incorporated in each of the means and the test chamber, the high temperature chamber and the low temperature chamber, and the signals from the sensors 165 to 168 incorporated in the binary refrigeration cycle,
Signals for controlling these drivers are output.

In the test, as in the case of the thermal shock test apparatus described with reference to FIGS. 1 to 4, after the binary refrigeration cycle and the heater are preliminarily operated, the pre-cooling operation and the pre-heating operation are performed. When the high temperature chamber reaches the predetermined pre-cooling temperature and pre-heating temperature, the sample is stored in the test room, the test room is connected to the low temperature room and the high temperature room alternately, and the sample is exposed to the cold air of the low temperature room and the hot air of the high temperature room. It is done by things.
However, in the preparation operation, the pre-cooling operation, and the low-temperature impact test operation of the binary refrigeration cycle, the operation control
1, 141 with different frequency changes, that is, outputs with different frequencies only, or outputs with the same frequency but different times during which this frequency is output, or The output is performed by causing the inverters 163 and 164 to output signals having different output times.

In the preparatory operation, the operation control means 150 activates the refrigeration compressor 131 and then activates the inverters 163, 1 so as to activate the refrigeration compressor 41 at different frequencies.
64 while controlling the expansion valves 143, 144
This is achieved by controlling the drivers of the expansion valves to maximize the opening of these expansion valves.

In the pre-cooling operation, the operation control means 150 monitors a signal from the sensor 166 at the inlet of the cascade heat exchanger 138, and the temperature of the refrigerant at the inlet of the cascade heat exchanger 138 becomes equal to the set temperature. To maintain the refrigeration compressor 141
In addition, the inverter 163 is controlled, and signals from the sensor 166 on the inlet side of the cascade heat exchanger 138 and the sensor 167 on the suction side of the refrigerating compressor 131 are monitored. A driver for adjusting the degree of opening of the expansion valve 143 is operated, and a signal from a sensor 168 at the outlet side of the condenser 132 is monitored.
2 controls the driver of the cooling medium amount adjusting means,
This is performed by maintaining the refrigeration capacity constant by making the outlet-side refrigerant temperature of 32 maintain a predetermined value.

When the low-temperature shock test operation is started, the operation control means 150 monitors signals from the temperature sensor in the low-temperature room and the temperature sensor in the test room, and compares the difference between these temperatures and the set temperature. If there is a temperature difference, the refrigeration compressor 14
1 is changed to change the number of revolutions of the refrigeration compressor 141, and the sensor 165 on the suction side of the refrigeration compressor 141 is compared with the signals from the temperature sensor in the low temperature chamber and the temperature sensor in the test chamber. If there is a temperature difference, a driver for adjusting the opening degree of the expansion valve 144 is operated to adjust the refrigeration capacity of the binary refrigeration cycle and maintain the test temperature in the test room.

As described above, this thermal shock test apparatus
In each of the preparatory operation, the pre-cooling operation, and the low-temperature impact test operation, the operation control means 150 controls the refrigeration compressor 13 according to the operation temperatures of the high-temperature refrigeration cycle and the low-temperature refrigeration cycle.
Since the inverters 163 and 164 for the first and 141 are controlled independently, and the openings of the expansion valves 134 and 143 are adjusted and the refrigerating capacity is adjusted more precisely, energy is wasted. It can be made even faster.

[0039]

As described above, the thermal shock test apparatus according to the present invention has a heater and a high temperature side constituting a binary refrigeration cycle.
Drive each refrigeration compressor of the refrigeration cycle and the low-temperature side refrigeration cycle.
Operation control means for controlling each of the electric motors and dampers to operate
And each of the motors is independently controlled.
In the thermal shock test apparatus, the operation control means
After starting the high-temperature refrigeration cycle,
Start the refrigeration cycle on the high-temperature side,
Starting the motor of the refrigeration compressor from the stop state,
With respect to the time required to increase the number of rotations,
Move the motor of the refrigerating compressor in the freezing cycle from its stopped state
The time required to increase the speed to the speed
The cascade of the binary refrigeration cycle
Eliminate sudden changes in load in heat exchanger
Stable operation and stable temperature drop
it can.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a configuration of an embodiment of a thermal shock test apparatus according to the present invention.

FIG. 2 is an explanatory diagram showing a configuration of a binary refrigeration cycle of the apparatus shown in FIG.

FIG. 3 is an explanatory diagram showing a configuration of operation control means included in the device shown in FIG.

FIG. 4 shows the temperatures of a test chamber, a high-temperature chamber and a low-temperature chamber in a thermal shock test, frequencies for driving electric motors of a high-temperature refrigeration cycle and a low-temperature refrigeration cycle, and electromagnetic waves for selecting an expansion valve in these binary refrigeration cycles. It is explanatory drawing which shows the relationship with operation | movement of a valve.

FIG. 5 is an explanatory view showing a configuration of a binary refrigeration cycle in another embodiment of the thermal shock test apparatus of the present invention.

[Explanation of symbols]

10: Test room, 11: High temperature room, 12: Low temperature room, 14-2
1, 18a, 19a ... communication means, 24 ... heater, 30 ...
Reheater, 38, 138 ... Cascade heat exchanger, 5
0, 150: operation control means, 31, 41, 131, 14
1. Refrigeration compressor, 63, 64, 163, 164 ... Inverter.

Continuation of the front page (56) References JP-A-3-154848 (JP, A) JP-A-2-192546 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01R 31 / 26 G01R 31/28

Claims (1)

(57) [Claims] 1. A test chamber for holding a sample, a heater, and a heater.
Storage material and blower for storing heat heated by heat
Heat exchange between the high-temperature chamber with
Heat exchanger and heat storage material for storing heat cooled by this heat exchanger.
Equipped with a reheater and a blower for heating the rejected air
Low temperature room, the test room and the high temperature room, and the test room
A plurality of passages connecting the greenhouse, and arranged in the test room,
A plurality of dampers for opening and closing the passage, the heater and the
High-temperature refrigeration cycle and low-temperature refrigeration cycle
Motors that drive each refrigeration compressor of the side refrigeration cycle and
And operation control means for controlling the damper and the damper,
Cold and heat impulse that controls each motor independently
In the hammering test apparatus, the operation control means may include the high-temperature side
After starting the refrigeration cycle, the low-temperature side refrigeration cycle
Is started, and the power of the refrigeration compressor of the high-temperature side refrigeration cycle is turned on.
The motive is changed from its stopped state to the rotation speed related to a specific frequency.
The cooling time of the low-temperature side refrigeration cycle
The electric motor of the frost compressor is changed from the stopped state to the specific frequency.
It is important to extend the time to increase to the relevant speed.
Thermal shock test equipment .