JPH02257036A - Cold/hot impact tester - Google Patents

Abstract

PURPOSE:To shorten the defrosting time of a cooler and to prevent melted drain from scattering to a test sample by circulating high-temp. air from a preheating chamber to a precooling chamber at the time of the defrosting of the cooler, and then executing the defrosting of the cooler. CONSTITUTION:An automatic defrosting operation mode is started when the operation of a refrigerator 6 stops upon ending cold/hot impacts cyclic operation and when a heater 3 and fans 4, 8 stop running. While an ordinary temp. damper 19 is closed by the control of a controller, a high-temp. damper 14 and a low- temp. damper 15 are opened. The heater 3 turns on, a high-temperature side compressor 25 turns off, a low-temperature side compressor 27 turns on, and a hot gas solenoid valve 40 turns on. The preheating chamber 5 and precooling chamber 9 are communicated via a test chamber 10 by opening dampers 14, 15 to circulate the high-temp. air from the preheating chamber 5 to the precooling chamber 9. The heater 3 is controlled by the temp. detection of a temp. sensor 47, by which the temp. in the chamber 5 is controlled to about 50 deg.C. The compressor 27 is operated and the defrosting ends when the detection temp. of a detecting sensor 48 attains >=30 deg.C.

Description

Detailed Description of the Invention (Industrial Application Field) The present invention relates to a thermal shock testing device, and more particularly, to a thermal shock testing device, which repeats a cycle of changing the temperature from a high temperature range to a low temperature range, and measures the heat of the test sample without moving the sample. The present invention relates to a thermal shock testing device capable of testing impact, temperature durability, etc.

(Prior art) In general, a thermal shock test device is
As shown in Japanese Patent Application No. 17 and schematically shown in FIG.
) is provided adjacent to a preheating chamber (C) and a precooling chamber (E) equipped with a cooler (D), and the test chamber (B) and the preheating chamber (C) are connected to each other by a high temperature damper (F). , the test chamber (B) and the precooling chamber (E) are separated by low-temperature dampers (G), and these dampers (F) and (G)
enable a thermal shock cycle in which the temperature of the test chamber (B) is raised or lowered by opening and closing;
It is possible to perform a thermal shock test on the sample in the test chamber (B). Further, by opening and closing the outside air intake part (A), outside air is taken into the test chamber (B) so that the test chamber (B) can be brought to room temperature, so that the temperature can be changed from a high temperature to a low temperature or from a low temperature to a high temperature. By once bringing the temperature to room temperature during the transition, the speed of the transition can be accelerated. Note that (H) is a fan.

(Problem to be Solved by the Invention) By the way, although the outside air taken into the test chamber (B) normally contains water vapor, when it is cooled in the precooling chamber (E), dew condensation occurs, and the Since (D) will be frosted and the capacity of the cooler (D) will be reduced, generally the refrigerant supplied to the cooler (D) is flowed in the opposite direction, or hot gas is supplied to the cooler (D). D) was defrosted, but there was a problem in that it took a considerable amount of time to defrost.

The present invention was invented in view of such conventional problems, and its purpose is to take note of the fact that high-temperature air exists in the preheating chamber, and to utilize the heat of this high-temperature air. Therefore, it is an object of the present invention to provide a thermal shock testing device that can shorten the defrost time of a cooler.

In addition, while the defrost time can be shortened by using high-temperature air, it is also possible to prevent melted condensate from splashing onto the sample in the test chamber.
Furthermore, it is an object of the present invention to provide a thermal shock testing apparatus that can eliminate the inconvenience of defrosting with high-temperature air in a pre-cooling chamber depending on the test conditions of the test sample in the test chamber.

(Means for Solving the Problems) As described above, in order to shorten the defrosting time, the first invention described in claim 1 provides an opening (18) that opens and closes an opening (18) communicating with outside air on one side. A test chamber (10) equipped with a room-temperature damper (19) for inserting a test sample, and a test chamber door (17) for opening and closing an insertion port (16) for inserting a test sample on the other side.
A heater (3) and a fan (
4), and a precooling chamber (9) where a cooler (7) and fan (8) connected to the refrigerator (6) are placed.
), and a high temperature damper (14) that opens and closes an opening (12) that communicates the test chamber (10) and the preheating chamber (5);
and a low temperature damper (15) that opens and closes an opening (13) communicating with the precooling chamber (9), when the cooler (7) is frosted, the high temperature and low temperature dampers (14) ) (15) and close the normal temperature damper (19) to communicate the preheating chamber (5) and the precooling chamber (9), so that the high temperature air in the preheating chamber (5) is transferred to the room temperature damper (19). circulate from the preheating chamber (5) to the precooling chamber (9),
The high temperature air is used as a heat source to defrost the cooler (7).

Further, the second invention as set forth in claim 2 provides that when defrosting is performed using high temperature air as a heat source as described above,
In order to prevent the condensate melted by defrosting from splashing onto the sample in the test chamber, the refrigerator (6) and the cooler (7) installed in the precooling chamber (9) during frosting are used. Hot gas valve that flows hot gas (40)
In addition to providing a hot gas bypass circuit (41) with A defrost detection sensor (48) detects the temperature of the air path circulating in the precooling chamber (9) and outputs the temperature at the time when condensate starts scattering due to defrost.
A defrost control controller (49) is provided which closes the dampers (14) and (15) based on the output of the defrost detection sensor (48) and switches to defrost operation using only hot gas bypass. In addition, the third invention described in claim 3 provides a hot gas flow system which, like the second invention, flows hot gas into the cooler (7) installed in the precooling chamber (9) when the refrigerator (6) is frosted. A hot gas bypass circuit (41) with a valve (40) is provided, and high and low temperature dampers (14) and (15) are opened to defrost the cooler (7) using the high temperature air in the preheating chamber (5) as a heat source. When performing this, a defrost detection sensor (48) detects the temperature of the air path circulating in the precooling chamber (9) and outputs the temperature at the time when condensate starts scattering due to defrosting.
At the same time, a fan (8) installed in the pre-cooling chamber (9) is provided.
) is linked to the variable speed motor (M), and the motor (M) is operated by the output of the defrost detection sensor (48).
It is preferable to provide a motor controller (81) that controls the speed to a low speed that makes it impossible for the drain to scatter.

Furthermore, the fourth invention described in claim 4 is:
In the defrosting operation using the high temperature air as the heat source, due to the test conditions of the test sample in the test chamber, there may be problems when performing defrost with the high temperature air in the precooling chamber, i.e., there may be problems with the temperature of the high temperature air in the test chamber (10). In order to solve the problem of defrosting with a test sample loaded, hot gas is sent to the cooler (7) installed in the precooling chamber (9) in the refrigerator (6) during frosting. A hot gas bypass circuit (41) is provided with a hot gas valve (40) to flow the hot gas, and the high temperature and low temperature dampers (14) and (15) are opened, and the hot air in the preheating chamber (5) is used as a heat source to cool the cooler (7). ) and the heater control temperature (T2) during high-temperature exposure control in the test chamber (10). When the temperature is lower than the heater control temperature (T1), the high and low temperature dampers (14) and (15) are closed and the preheating chamber (5
) is provided with a defrost control controller (4) that stops the defrost operation that uses high-temperature air as a heat source and controls the defrost operation using only hot gas bypass.

(Function) In the first invention, when defrosting the cooler (7), the preheating chamber (5) and the precooling chamber (9) are separated by opening the high temperature and low temperature dampers (14) and (15). The test chamber (10) communicates with the preheating chamber (
5) high temperature air is transferred from the preheating chamber (5) to the precooling chamber (9).
), and the heat of this high-temperature air can be given to the cooler (7) in the precooling chamber (9), reducing the time required for defrosting the cooler (7). .

In addition, in the second and third inventions, while the defrosting time can be shortened as in the first invention, when defrosting is performed using the heat of high-temperature air as a heat source, when the drain starts to scatter due to defrosting. In the second invention, the dampers (14) and (15) are closed based on the output of the defrost detection sensor (48), and the defrost operation is switched to only by hot gas bypass. The test chamber (10) is controlled by the output of the sensor (48) to control the variable speed motor (8a) linked to the fan (8) of the pre-cooling chamber (9) to a low speed that disables the splashing of condensate. This prevents drain water from splashing inside.

Furthermore, in the fourth invention, the heater control temperature (T, ) of the preheating chamber (5) during the defrost operation is compared with the heater control temperature (T2) under high temperature exposure control during the test.
When the heater control temperature (T2) during the test is lower than the heater control temperature (T1) during defrost, the high and low temperature dampers (14) and (15) are closed and the high temperature air in the preheating chamber (5) is used as the heat source. By canceling the defrost operation and performing the defrost operation using only the hot gas bypass, it is possible to prevent the test sample in the test chamber (10) from being exposed to high-temperature air higher than the control temperature during high-temperature exposure.

(Example) An embodiment of the present invention will be described based on FIGS. 1 to 4.

FIG. 1 shows an outline of the thermal shock test apparatus according to the present invention. Basically, the inside of a housing (1) is partitioned by a heat insulating partition wall (2), and a heater (3) and a fan ( 4), and a precooling chamber (9) in which a cooler (7) and a fan (8) connected to the cascade refrigerator (6) via a low-temperature side refrigerant circuit (28) are arranged. , a test chamber (1
0).

The preheating chamber (5) and the precooling chamber (9) are provided with a heat insulating partition wall (11
) adjacent to both sides of the test chamber (10), the test chamber (10), the preheating chamber (5), and the precooling chamber (9).
An opening (11) communicating the test chamber (10) and the preheating chamber (5) is provided in each heat insulating partition wall (11) (11) that partitions the test chamber (10) and the preheating chamber (5).
12) (12), and the test chamber (10) and the pre-cooling chamber (
9) are provided, and high temperature and low temperature dampers (1) provided in each opening (12) (13) are provided.
4) By opening and closing (15), the preheating chamber (5) or the precooling chamber (9) is selectively communicated with the test chamber (10), and cold air and hot air are selectively supplied to the test chamber (10). I am trying to introduce it.

Further, one side of the test chamber (10) is provided with a door (17) for opening and closing an opening (16) into which a test sample is inserted, and a pair of openings (18) (18) is provided on the other side. is provided, and outside air is introduced into the test chamber (10) by opening and closing the normal temperature damper (19). Furthermore, an outside air introduction duct (22) equipped with a dehumidifier (20) and a suction fan (21) is connected to one opening (18) of the pair of openings (18) (18). Test room (1
The other opening (18) is connected to an exhaust duct (24) equipped with an exhaust fan (23).

As shown in FIG. 2, the cascade type refrigerator (6) has a high temperature side refrigerant circuit (2) having a high temperature side compressor (25).
6), a low-temperature side refrigerant circuit (with a low-temperature side compressor (27)
28) and a cascade condenser (29) shared by both circuits (27) and (28), and the high temperature side refrigerant circuit (26) includes a condenser (30), an expansion valve (3
1) and an accumulator (32), and the low temperature side refrigerant circuit (28) is equipped with an expansion valve (33), the cooler (7) disposed in the precooling chamber (9), and an accumulator (34). I am intervening.

Further, the high temperature side refrigerant circuit (26) includes a solenoid valve (35).
and a reheater (36) and a cooler (3) constituting the dehumidifier (20) installed in the outside air introduction duct (22).
7) etc. are installed in series, and the reheater (36) is operated by operating the solenoid valve (35).
A refrigerant is supplied from the high temperature side compressor (25) to the cooler (37) so that the outside air introduced into the test chamber (10) can be dehumidified. Moreover, the low temperature side refrigerant circuit (
28) is provided with a hot gas bypass circuit (41) equipped with a hot gas solenoid valve (40), and the cooler (7) disposed in the precooling chamber (9) is operated by operating the hot gas solenoid valve (40). ) can also be defrosted using hot gas.

The white arrow shown in FIG. 2 indicates the direction in which the refrigerant flows in the low temperature side refrigerant circuit (28) when the hot gas solenoid valve (40) is activated to defrost the cooler (7). The black arrows indicate the flow of each refrigerant in the high temperature side refrigerant circuit (26) and the low temperature side refrigerant circuit (28) during the freezing operation of the refrigerator (6). Also, (42) is a hair dryer (43)
is an expansion tank that stores refrigerant in the low temperature side refrigerant circuit (28) when the low temperature side compressor (27) is not operated, and is provided with a discharge pressure regulating valve (44). Furthermore, (45
) is an oil separator installed on the discharge side of the low temperature side compressor (27), and (46) is a capillary.

Therefore, in the thermal shock test apparatus configured as above, when the cooler (7) is frosted, the high temperature and low temperature dampers (14) and (15) are opened, and the room temperature damper (19) is closed. , the preheating chamber (5) and the precooling chamber (9) are communicated with each other, the high temperature air in the preheating chamber (5) is circulated from the preheating chamber (5) to the precooling chamber (9), and the high temperature air is The cooler (7) was used as a heat source to defrost it.

Specifically, as shown in FIG. 3, a preheating chamber temperature sensor (47) is installed in the preheating chamber (5), and a preheating chamber temperature sensor (47) is installed in the
is equipped with a defrost detection sensor (48),
A defrost control controller (49) is provided, and the input side of the controller (49) is connected to the preheating chamber temperature sensor (47) and the defrost detection sensor (48), while the output side is connected to the preheating chamber temperature sensor (47) and the defrost detection sensor (48). Heater switch (50) that operates the heater (3) placed in (5)
), a high temperature damper opening/closing motor (51) that opens and closes the high temperature damper (14), a normal temperature damper opening/closing motor (52) that opens and closes the normal temperature damper (19), and a low temperature damper opening/closing motor (52) that opens and closes the low temperature damper (15). motor (53)
, a low temperature side compressor drive motor (54) that drives the low temperature side compressor (27), and the hot gas solenoid valve (40) interposed in the hot gas bypass circuit (41) of the low temperature side refrigerant circuit (28). ) are connected to each other. still,
(55) is a pre-cooling room temperature sensor.

Next, the cooler (7) placed in the precooling chamber (9)
Defrosting will be explained based on the flowchart shown in FIG.

At the end of the thermal shock test, that is, when the thermal shock cycle operation is completed and the refrigerator (6) stops operating, and the heater (3) and each fan (4) and (8) stop, the automatic defrost If the operation on/off switch (not shown) is operated by a human, the automatic defrost operation mode is entered. This automatic defrost operation mode is controlled by the controller (49).
Under this control, the normal temperature damper (19) is closed, while the high temperature damper (14) and low temperature damper (15) are opened. Next, the heater (3) is ON1, the high temperature side compressor (25) is 0FF1, the low temperature side compressor (27) is ON1
The hot gas solenoid valve (40) is turned on.

Then, by opening the high temperature and low temperature dampers (14) and (15), the preheating chamber (5) and the precooling chamber (9) are communicated via the test chamber (10), and the preheating chamber (5) is communicated with the precooling chamber (9) through the test chamber (10).
) from the preheating chamber (5) to the precooling chamber (9).
and the preheating chamber temperature sensor (47).
Based on the temperature detection, the heater (3) is controlled to control the temperature in the preheating chamber (5) to about 50°C, and the low temperature side compressor (27) is operated at +30Hz. When the temperature (T) detected by the defrost detection sensor (48) provided in the cooler (7) becomes 30°C or higher, or when the elapsed time (1) from the start of defrost exceeds 45 minutes, defrost starts. It ends. At the end of defrosting, the low temperature side compressor (27) and the hot gas solenoid valve (4o) are turned off, all dampers (14), (15), and (19) are closed, and the heater (3) is also turned off. It becomes OFF. In addition, when the preheating chamber (5) and the precooling chamber (θ) are communicated through the test chamber (10) by opening the high temperature and low temperature dampers (14) and (15) during defrosting, , a fan (4) disposed in the preheating chamber (5) and the precooling chamber (9).
) are all operated.

Therefore, as described above, by communicating the preheating chamber (5) and the precooling chamber (9), heat can be directly applied to the cooler (7) from the high temperature air from the preheating chamber (5). To shorten the time required for defrosting operation of the refrigerator (6) by operating the hot gas solenoid valve (40) installed in the hot gas bypass circuit (41) of the low temperature side refrigerant circuit (28). This is possible.

Moreover, since the air in the preheating chamber (5) can be heated by operating the heater (3) during defrosting,
Rapid defrosting is possible without providing a heat source for defrosting the cooler (7) other than the heater (3).

In this embodiment, the low temperature side compressor (27) is operated by the hot gas solenoid valve (41) provided in the hot gas bypass circuit (41) of the low temperature side refrigerant circuit (28).
By bypassing the refrigerant from the cascade condenser (29) and directly sending it to the cooler (7),
Although the defrosting operation of the refrigerator (6) for defrosting the cooler (7) can be used in combination, it is not necessary to use the defrosting operation in combination. In this case, during defrosting, each of the compressors (2
5) Defrosting can be performed without performing the operation in (27).

In addition, in the above embodiment, when defrosting is performed using high temperature air as a heat source, the low temperature damper (15) is opened, so as the defrost progresses, condensate melted by the defrost splashes into the test chamber (10). However, in order to prevent this water splash, it is preferable to configure as follows. That is, as shown in FIG. 5, the temperature of the tube plate (71) and, as a result, the temperature of the air circulating in the pre-cooling chamber (9) is shown on the side surface of the tube plate (71) of the cooler (7) in the pre-cooling chamber (9). A defrost detection sensor (48) is provided that detects the inlet side temperature and outputs an output based on the temperature at the time when condensate starts scattering due to defrost, and as shown in the flowchart of FIG. When the temperature on the outlet side of tube plate (7) is 0°C or more and the drain is about to scatter, that is,
) When the detected temperature (T) of the defrost detection sensor (48) provided in , said refrigerator (
Opening the hot gas solenoid valve (40) in 6),
The defrost operation is performed using only the hot gas bypass circuit (41).

In the flowchart of FIG. 6, the defrost operation by hot gas bypass is controlled as explained in the flowchart of FIG. For example, 2 to 3 hours until the melted condensate is completely drained.
The start of operation of the refrigerator (6) is delayed for one minute.

In the embodiment shown in FIGS. 1 and 2, the motor (M) of the fan (8) installed in the precooling chamber (9) is a variable speed motor, and as shown in FIG. A motor controller (81) for controlling the variable speed motor (M) is connected to the output side of the control controller (49), and the defrost detection sensor (48) is provided similarly to the embodiment described above. The defrost detection sensor (48) is connected to the input side of the controller (49), and as shown in the flowchart of FIG.
) when the detected temperature (T) of the motor (M) becomes 7°C or higher, the defrost controller (49) controls the variable speed motor (M,) to change the rotation speed of the motor (M) by pole change or frequency conversion. The fan (
8), and the hot gas solenoid valve (40) in the refrigerator (6) is opened, and the hot gas bypass circuit (41 ) may perform defrosting only by defrosting operation. Further, the defrost operation using the hot gas bypass in this embodiment is controlled in the same manner as in the above-described embodiment.

Further, in the embodiment, when defrosting the cooler (7) of the pre-cooling chamber (9) using the high-temperature air of the pre-heating chamber (5) as a heat source, the test conditions for the test sample in the test chamber (10) are Accordingly, it may be possible to select whether or not to perform defrosting using high-temperature air in the preheating chamber (5). That is, the heater control temperature during high temperature exposure control of the test chamber (10), that is, the preheating chamber temperature sensor (
The temperature in the test chamber (10), which is controlled based on the high temperature of the preheating chamber (5) which is controlled by turning on and off the heater (3), can be set to an arbitrary temperature according to the test sample. For samples that do not like high-temperature heating, the heater control temperature (e.g. 35°C to 40°C) when defrosting is performed using the high-temperature air in the preheating chamber (5) as a heat source
'C) may be set to a lower temperature (e.g. 30°C). Therefore, in this case, the defrost operation using the high temperature air in the preheating chamber (5) is stopped, and the defrost operation is switched to using only the hot gas bypass circuit (41). In this case, the defrost controller (49) is controlled by the heater control temperature (T1) and the preheating chamber temperature sensor (47) when defrosting is performed using the high temperature air in the preheating chamber (5) as a heat source. A comparator (not shown) is used to compare the heater control temperature (T2) during the high-temperature exposure control of the test chamber (10) with the heater control temperature (T2) during the defrosting. When the temperature is lower than (T1), the high temperature and low temperature dampers (14) and (15) are closed to output an output. Therefore, according to this embodiment, as shown in the flowchart of FIG. 9, the cooler (7) is defrosted using the high temperature air of the preheating chamber (5) controlled by the preheating chamber temperature sensor (47) as a heat source. and the heater control temperature (T2) of the test chamber (10) during the high temperature exposure control of the test sample controlled by the preheating chamber temperature sensor (47).
), and when the heater control temperature (T2) during the test is lower than the heater control temperature (T□) during the defrost,
The high-temperature and low-temperature dampers (14) and (15) are closed, the defrost operation using the high-temperature air in the preheating chamber (5) as a heat source is stopped, and the hot gas bypass circuit (
41), and thereafter the control is performed as explained in the flowchart of FIG. 4.

(Effects of the Invention) As explained above, in the thermal shock test apparatus of the first invention, when the cooler (7) is frosted, the high temperature and low temperature dampers (14) and (15) are opened, and the room temperature damper ( 19) is closed, and the preheating chamber (5) and the precooling chamber (
9) to communicate the high temperature air in the preheating chamber (5),
Since the preheating chamber (5) is circulated to the precooling chamber (9) and the high temperature air is used as a heat source to defrost the cooler (7), the heat of the high temperature air in the preheating chamber (5) is transferred to the precooling chamber. (9) can be directly supplied to the cooler (7), and the time required for defrosting the cooler (7) can be shortened.

Further, in the second and third inventions, while the defrosting time can be shortened as in the first invention, when defrosting operation is performed using high temperature air as a heat source, and when drain is about to scatter as the defrosting progresses, the second invention , the high temperature and low temperature dampers (14) and (15) are closed, and in the third invention, the air volume of the fan (8) installed in the precooling chamber (9) is reduced, so that melting due to defrosting is prevented. It is possible to prevent the drain from entering the test chamber (10), and as a result, it is possible to prevent frosting in the test chamber (10) and to eliminate any influence on the test sample.

Furthermore, in the fourth invention, the preheating chamber (5
) and the heater control temperature by high-temperature exposure control during the test, and when the heater control temperature during the test is lower than the heater control temperature during defrost, the high-temperature and low-temperature dampers (14) (15) was closed, the defrost operation using the high temperature air in the preheating chamber (5) as a heat source was stopped, and the defrost operation was controlled using only the hot gas bypass, so the test sample was left in the test chamber (10). Even when defrosting operation is performed and the sample does not like high temperatures, it is possible to prevent the sample from being exposed to high-temperature air in the preheating chamber (5) during defrosting. It is.

[Brief explanation of drawings]

Fig. 1 is a sectional view showing the overall structure of the thermal shock test device according to the present invention, Fig. 2 is a piping system diagram of the refrigerator, Fig. 3 and Fig. 7 are a defrost operation diagram, and Fig. 5. 1 is a perspective view of the cooler, FIGS. 4, 6, 8, and 9 are defrost operation flowcharts, and FIG. 10 is a schematic sectional view showing a conventional example. (3)...Heater (4)...Fan (40)...Hot gas valve (41)...Hot gas bypass circuit (48)...
... Defrost detection sensor (49) ... Defrost control controller (5) ... Preheating chamber (6) ... Refrigerator (7) ... ...Cooler (8) ...Fan (8a) ...Variable speed motor (81) ...Motor controller (9) ...Precooling chamber (10 )...Test chamber (14)...High temperature damper (15)...Low temperature damper (19)...Normal temperature damper

Claims (1)

[Claims] 1) A room temperature damper (19) that opens and closes an opening (18) communicating with outside air on one side, and a test chamber that opens and closes an insertion port (16) into which a test sample is inserted on the other side. A preheating chamber (5) in which a heater (3) and a fan (4) are arranged in a test chamber (10) equipped with a door (17) through a heat insulating partition (11)
Cooler (7) and fan (8) connected to refrigerator (6)
A high temperature damper (14) that opens and closes an opening (12) that communicates the test chamber (10) and the preheating chamber (5) with a precooling chamber (9) in which the test chamber (10) and the preheating chamber (5) are arranged;
In a thermal shock test apparatus comprising a low-temperature damper (15) that opens and closes an opening (13) communicating between the test chamber (10) and the pre-cooling chamber (9), when the cooler (7) is frosted, the Opening the high temperature and low temperature dampers (14) and (15) and closing the normal temperature damper (19),
The preheating chamber (5) and the precooling chamber (9) are communicated with each other, the high temperature air in the preheating chamber (5) is circulated from the preheating chamber (5) to the precooling chamber (9), and the high temperature air is used as a heat source. A thermal shock testing apparatus characterized in that the cooler (7) is defrosted. 2) A hot gas valve (4) that flows hot gas to the cooler (7) installed in the precooling chamber (9) when the refrigerator (6) is frosted.
At the same time, a hot gas bypass circuit (41) with a hot gas bypass circuit (41) is provided, and high-temperature and low-temperature dampers (14) (15) are opened, and the hot air in the preheating chamber (5) is used as a heat source to cool the cooler (41).
When defrosting in step 7), a defrost detection sensor (
48), and a defrost control controller (49) that closes the dampers (14) and (15) based on the output of the defrost detection sensor (48) and switches to defrost operation using only hot gas bypass.
Thermal shock test apparatus described. 3) A hot gas valve (4) that flows hot gas to the cooler (7) installed in the pre-cooling chamber (9) when the refrigerator (6) is frosted.
At the same time, a hot gas bypass circuit (41) with a hot gas bypass circuit (41) is provided, and high-temperature and low-temperature dampers (14) (15) are opened, and the hot air in the preheating chamber (5) is used as a heat source to cool the cooler (41).
When defrosting in step 7), a defrost detection sensor (
48), and a fan (8) installed in the pre-cooling chamber (9) is linked to a variable speed motor (M) so that the motor (M) is controlled by the output of the defrost detection sensor (48).
2. The thermal shock testing apparatus according to claim 1, further comprising a motor controller (81) for controlling the motor (81) to a low speed that makes it impossible for the drain to scatter. 4) The refrigerator (6) has a hot gas valve (
A hot gas bypass circuit (41) is provided with a hot gas bypass circuit (40), and the high temperature and low temperature dampers (14) and (15) are opened, and the high temperature air in the preheating chamber (5) is used as a heat source to cool the cooler (40).
The heater control temperature when defrosting in step 7) is compared with the heater control temperature during high temperature exposure control in the test chamber (10), and when the heater control temperature during the test is lower than the heater control temperature during defrosting, A defrost control controller (49) is provided that closes the high-temperature and low-temperature dampers (14) and (15), stops the defrost operation using the high-temperature air in the preheating chamber (5) as a heat source, and controls the defrost operation using only the hot gas bypass. The thermal shock testing device according to claim 1.