JP2010210443A - Thermo-hygrostat - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a thermo-hygrostat acquiring accurate humidity distributions. <P>SOLUTION: The thermo-hygrostat comprises: an inner tank covered with a heat insulating material and provided with a temperature and humidity measuring means for measuring the temperature and humidity of one spot inside; a heater; a cooler; a humidifier; and an air blower which change the temperature and humidity of the inside of the inner tank and is used for high temperature and high humidity condition test. A plurality of temperature sensors are provided for the inner surface of the inner tank, and an aerometer is provided at a prescribed interval from the inner surface of the inner tank. The thermo-hygrostat is provided with a control unit for computing a humidity distribution inside the inner tank on the basis of: the temperature and humidity of the one spot inside the inner tank measured by the temperature and humidity measuring means; temperatures measured by the temperature sensors; and wind velocity measure by the aerometer. The control unit computes the humidity distribution by regarding the temperatures measured by the temperature sensors as the wet bulb temperatures, and the temperature measured by the temperature and humidity measuring means as the dry bulb temperature. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

The present invention relates to a thermo-hygrostat which is one of environmental test apparatuses, and more particularly, to a thermo-hygrostat for performing a test in a high temperature and high humidity state.

An environmental test is used as a method for testing the durability of equipment, components, and the like. Such an environmental test is performed using an environmental test apparatus. Various tests are performed as environmental tests, and various environmental test apparatuses are used according to the tests. Constant temperature and humidity as one of the environmental test equipment to perform burn-in processing for reliability evaluation and screening of various semiconductor elements, electronic circuits, etc., and to test the heat resistance and moisture resistance of various articles and materials. A vessel is used.

The constant temperature and humidity chamber is provided with a heater, a cooling device, and a humidifying device, and creates a desired environment in the cabinet. For example, a temperature and humidity environment such as a temperature of 60 ° C. and a humidity of 80% is artificially created (patented) Reference 1).

In the conventional temperature and humidity chamber, when measuring the humidity distribution in a narrow space, a large number of humidity sensors cannot be used in order not to change the temperature in the measurement environment. Only one central point of the thermo-hygrostat was measured using a humidity sensor. The humidity distribution is obtained by calculating based on the humidity at one point and the temperatures measured at a plurality of points by a plurality of dry bulb thermometers.

JP 2000-11127 A

However, the humidity distribution obtained by such calculation and the actual humidity distribution do not completely coincide with each other, and there is a problem that deviation occurs.

Therefore, in view of the above-described problems of the prior art, the present invention has an object to provide a constant temperature and humidity chamber capable of obtaining an accurate humidity distribution and further capable of obtaining a humidity distribution necessary for a test. And

The constant temperature and humidity chamber of the present invention is covered with a heat insulating material, and has an inner tank provided with temperature and humidity measuring means for measuring the temperature and humidity of one point inside, and changes the temperature and humidity inside the inner tank. A constant temperature and humidity chamber provided with a heater, a cooler, a humidifier, and a blower, and used for testing in a high temperature and high humidity state, wherein a plurality of temperature sensors are provided on the inner surface of the inner tank, and the inner tank An anemometer is provided at a predetermined interval from the inner surface of the inside, and the temperature and humidity at one point inside the inner tank measured by the temperature and humidity measuring means, the temperature measured by the temperature sensor, and the anemometer A control device that calculates the humidity distribution inside the inner tub from the measured wind speed is provided, the control device regards the temperature measured by the temperature sensor as the wet bulb temperature, and the temperature measured by the temperature and humidity measuring means is a dry bulb. Humidity by considering temperature Calculation, characterized in that.

The temperature sensor is provided at a place where condensation occurs inside the inner tank, or condensation is generated at a place where the temperature sensor is provided. Further, the control device allows the temperature sensor to select from the temperature measured by a plurality of temperature sensors. Then, the measurement temperature determined to be in the dew condensation state is extracted, and the humidity is calculated considering the wet bulb temperature.

Furthermore, the humidity distribution obtained by the control device is compared with the set humidity at the time of the test, and the control device allows the heater, humidifier, cooler, Control the operation of the blower.

Comparing the humidity distribution calculated in the absence of a sample in advance with the control device and the humidity distribution obtained at the time of testing, an alarm may be provided to notify the abnormality when it is determined that the humidity distribution at the time of testing is abnormal. Is possible.

Further, as the temperature and humidity measuring means, one humidity sensor, or a dry bulb thermometer and a wet bulb thermometer are used.

The constant temperature and humidity chamber of the present invention is covered with a heat insulating material, and has an inner tank provided with temperature and humidity measuring means for measuring the temperature and humidity of one point inside, and changes the temperature and humidity inside the inner tank. A constant temperature and humidity chamber comprising a heater, a cooler, a humidifier, and a blower, wherein a plurality of temperature sensors are provided on the inner surface of the inner tub, and a predetermined interval is provided from the inner surface of the inner tub. An anemometer is provided separately from the humidity at one point inside the inner tank measured by the temperature and humidity measuring means, the temperature measured by the temperature sensor, and the wind speed measured by the anemometer. By providing a control device for calculating the internal humidity distribution, it is possible to obtain an accurate humidity distribution inside the inner tank.

The temperature sensor is provided in a place where condensation occurs, or condensation is generated in the place where the temperature sensor is provided. Further, the controller is in a dew condensation state from among the temperature measured by a plurality of temperature sensors. It is possible to obtain a more accurate humidity distribution by extracting the determined measurement temperature and calculating the humidity by considering it as the wet bulb temperature.

Furthermore, the humidity distribution obtained by the control device is compared with the set humidity at the time of the test, and the control device allows the heater, humidifier, cooler, By controlling the operation of the blower, it is possible to approach an ideal humidity distribution necessary for the test, and it is possible to perform a more accurate environmental test.

In addition, the control device compares the humidity distribution calculated in the sample-free state in advance with the humidity distribution obtained during the test, and has an alarm that notifies the abnormality when it is determined that the humidity distribution during the test is abnormal. As a result, it is possible to automatically stop the test when a defect occurs in the test, or to quickly return the test to a normal state.

It is a schematic sectional drawing of the thermo-hygrostat of this invention. It is sectional drawing of the temperature sensor vicinity at the time of using a hollow and an axial-flow fan as a means to generate | occur | produce dew condensation. It is sectional drawing of the temperature sensor vicinity at the time of using a heat pipe as a means to generate dew condensation.

Mode for carrying out the present invention

Hereinafter, the constant temperature and humidity chamber 1 of the present invention will be described in detail with reference to the drawings. FIG. 1 is a schematic cross-sectional view of a constant temperature and humidity chamber 1.

The thermo-hygrostat 1 of the present invention is for performing a test in a high-temperature and high-humidity state, and changes the temperature and humidity inside the inner tank 2 into which a sample to be tested is placed, and the inner tank 2; A blower 3, a heater 4, a cooler 5, and a humidifier 6 are provided. The inner tub 2 is covered with a heat insulating material 9, and the inner tub 2 and a space in which the heater 4, the humidifier 6, the cooler 5, and the blower 3 are arranged are partitioned by a partition wall 18.

The inner tank 2 is provided with temperature and humidity measuring means 8 for measuring the temperature and humidity at one point inside the inner tank 2. In the present embodiment, as the temperature / humidity measuring means 8, a temperature / humidity sensor having a single temperature sensor and humidity sensor is used. However, the temperature / humidity measuring means 8 is not limited to a temperature / humidity sensor, and a dry bulb thermometer and a wet bulb thermometer may be used. When a dry bulb thermometer and a wet bulb thermometer are used, one point of dry bulb temperature and one point of wet bulb temperature are measured, and one point of humidity can be calculated from these temperatures.

Such temperature / humidity measuring means 8 has been used in a conventional constant temperature and humidity chamber. However, in the constant temperature and humidity chamber 1 of the present invention, a plurality of temperature sensors 10 are further provided on the inner surface of the inner tank 2. ing. The temperature sensor 10 can be embedded in a predetermined portion of the inner surface of the inner tub 2, for example, as shown in FIG. 1, in addition to being embedded in the inner wall, the inner surface of the door 17 or the bottom surface of the inner tub 2. Or it can be embedded in the ceiling.

The number of the temperature sensors 10 to be arranged is not particularly limited, and can be set according to the size of the inner tank 2, the number of samples, and the arrangement state. As the temperature sensor 10, a thermocouple is used, and it is preferable to use one having the same heat capacity as the material of the inner surface of the inner tank 2. Moreover, it is preferable to use the shape and attachment method which do not interfere with the semi-sealing property and heat insulation of the inner tank 2.

Furthermore, an anemometer 19 is provided in the inner tub 2 at a predetermined distance from the inner surface thereof. As the anemometer 19, a hot wire anemometer or the like is used. In accordance with the wind speed obtained by the anemometer 19, an expression necessary for determining the humidity is determined.

The temperature / humidity measuring means 8, the temperature sensor 10 and the anemometer 19 are connected to a control device 11, and the temperature / humidity inside the inner tub 2 measured by the temperature / humidity measuring means 8, and the temperature sensor The temperature distribution of the inner surface of the inner tub 2 measured by 10 and the wind speed measured by the anemometer 19 are sent to the control device 11. And based on these data, the humidity calculation part 12 of the said control apparatus 11 calculates | requires the humidity of the place in which the said temperature sensor 10 was provided. The controller 11 calculates the humidity distribution by regarding the temperature measured by the temperature sensor 10 as the wet bulb temperature and the temperature measured by the temperature / humidity measuring means 8 as the dry bulb temperature. Thereby, the humidity distribution inside the inner tank 2 is obtained. The humidity calculation unit 12 stores an equation for calculating the humidity according to the wind speed, and the humidity calculation unit 12 determines an expression necessary for obtaining the humidity according to the wind speed obtained by the anemometer 19. To do.

In the present invention, as described above, the temperature measured by the temperature sensor 10 is regarded as the wet bulb temperature and used for measuring the humidity distribution. This is because the vaporized water vapor in the inner tank 2 is liquefied and dew condensation occurs when the temperature drops to the dew point temperature. In a state where condensation occurs, condensation does not proceed as it is, but a state where condensed water evaporates occurs. In such a state, when the temperature is measured by the temperature sensor 10 in the dewed portion, the same state as when the wet bulb temperature is measured is obtained. Therefore, in the present invention, the temperature measured by the temperature sensor 10 is regarded as the wet bulb temperature.

As described above, when the temperature is measured by the temperature sensor 10, it is preferable that the dew condensation state is evaporated as described above, and such a state is likely to occur in a test in a high temperature and high humidity state. Therefore, there are several methods for measuring an appropriate temperature when setting a place where the temperature sensor 10 is provided. The first is a method in which the temperature sensor 10 is disposed in a place where condensation inside the inner tank 2 is likely to occur. This is because, for example, when a method of keeping the temperature and humidity inside the inner tub 2 by heating and vaporizing water in the back of the inner tub 2 is used, the door on the inner surface of the inner tub 2 is used. On the side 17 side, water vapor is likely to fall to the dew point temperature and condensate, so that the position of the door 17 can be selected as the inner surface of the inner tank 2 to arrange a plurality of temperature sensors 10. Thus, when dew condensation occurs at a specific position depending on the test state or the constant temperature and humidity chamber, the temperature sensor 10 may be disposed at that location.

The second is a method of intentionally generating condensation at a place where the temperature sensor 10 is disposed. For example, as shown in FIG. 2, the heat insulating material 9 on the outer surface of the inner tub 2 where the temperature sensor 10 and the anemometer 19 are provided is partially thinned to provide a dent 21. Heat is applied to the heat insulating material 9 where the axial flow fan 22 is provided and the wind is locally applied to generate condensation, or the temperature sensor 10 and the anemometer 19 of the inner tub 2 are provided as shown in FIG. There is a method in which the pipe 23 is embedded to generate condensation. The method of generating condensation is not limited to these, and it is possible to use various methods such as a method of providing only one of the above-described depression or axial fan, or a method of embedding means other than the heat pipe. It is conceivable to generate

In the two methods described above, depending on the state of the test and the arrangement state of the sample, there is a possibility that the temperature sensor 10 measures a temperature completely different from the wet bulb temperature without causing condensation. Therefore, as a third method, the control device 11 determines whether the temperature measured by the plurality of temperature sensors 10 is the wet bulb temperature, and the temperature sensor determined to be usable as the wet bulb temperature. In this method, only 10 measurement results are extracted and used for calculating the humidity distribution. If such a method is used, not only the arrangement of the temperature sensor 10 as shown in the first and second cases, but also a large number of temperature sensors 10 are arranged regardless of the occurrence of condensation, and condensation has actually occurred. Only the local temperature sensor 10 can be used, and the temperature sensor 10 can be arranged more freely.

The blower 3, the heater 4, the cooler 5 and the humidifier 6 are controlled by a temperature / humidity control unit 13 of the control device 11. The humidity of the place where each temperature sensor 10 obtained by the humidity calculation unit 12 is compared with the set humidity of the test. At this time, when there is a place having a humidity different from the set humidity, the temperature / humidity control unit 13 operates the blower 3, the heater 4, the cooler 5, and the humidifier 6 so that the set humidity is obtained. The humidity distribution in the inner tub 2 is changed.

The usage method of the constant temperature and humidity chamber 1 of this invention is demonstrated. First, the thermo-hygrostat 1 is operated in a sample-free state. At this time, based on the data obtained in advance, the temperature / humidity controller 13 controls the blower 3, the heater 4, the cooler 5, and the humidifier 6 so that the inside of the inner tank 2 has a set humidity. Operate to change the humidity and temperature of the inner tub 2.

When the predetermined time has elapsed and the set humidity / temperature state is reached, the temperature / humidity measuring means 8 measures one point of temperature / humidity in accordance with the IEC or JTM standard. At the same time, the temperature of the inner surface of the inner tank 2 is measured using the temperature sensor 10, and the wind speed is further measured by the anemometer 19. In accordance with the wind speed obtained by the anemometer 19, an equation necessary for obtaining the humidity is determined, and the temperature measured by the temperature sensor 10 is used as the wet bulb temperature in the humidity calculation unit 12 of the control device 11. Calculate the humidity from the sphere temperature calculation. Thereby, the humidity of the location in which the said temperature sensor 10 was provided is obtained.

Next, the constant temperature and humidity chamber 1 is operated in a sampled state, and the temperature / humidity control unit 13 causes the blower 3, the heater 4, the cooler 5, and the humidification so as to have the same set humidity as in the sampleless state. The vessel 6 is operated to change the humidity and temperature of the inner tank 2.

When the predetermined time has elapsed, the temperature and humidity are measured by the temperature and humidity measuring means 8 according to the IEC or JTM standard, and the temperature sensor 10 is used to measure the inner surface of the inner tub 2 in the same manner as in the sample-free state. The temperature is measured, and further the wind speed is measured by the anemometer 19. In accordance with the wind speed obtained by the anemometer 19, an equation necessary for obtaining the humidity is determined, and the temperature measured by the temperature sensor 10 is used as the wet bulb temperature in the humidity calculation unit 12 of the control device 11. Calculate the humidity from the sphere temperature calculation. Thereby, the humidity of the location in which the said temperature sensor 10 was provided is obtained.

The control device 11 compares the obtained humidity distribution with the humidity distribution in the unsampled state. As a result of the comparison, there is no problem if the humidity distribution is the same as that in the non-sample state, but if a different humidity distribution is obtained, it is determined that a staying portion exists in the inner tank 2.

If the residence location is found from the humidity distribution, it is necessary to take measures to eliminate the residence. There are several methods for eliminating the stay. First, it is a method of changing the arrangement state of the sample. Retention is eliminated by changing the orientation and location of the sample. Alternatively, when a plurality of samples are arranged, it is conceivable to change the number of samples. Thereby, it is also possible to know an appropriate number of samples.

Further, as a method using the control device 11, there is a method of changing the wind speed by operating the blower 3 to eliminate the stay. Further, a method of newly installing an auxiliary blower or a method of previously installing the auxiliary blower and controlling the operation of the auxiliary blower by the control device 11 as necessary is used. Furthermore, a wind direction varying device may be provided in the blowout part of the blower 3 to change the wind direction as appropriate. When such a method is used, it is preferable that the temperature / humidity control unit 13 performs appropriate control.

By eliminating the staying location using such a method, the thermo-hygrostat 1 of the present invention can make the inner tank 2 have a humidity distribution close to the set humidity necessary for the test, and a more accurate test. It can be performed. Further, if the procedure for measuring the humidity distribution is performed in time series according to the change in temperature, it is also possible to obtain the change state of the humidity distribution in time series.

Moreover, when the humidity distribution at the time of the test obtained by the control device 11 is compared with the humidity distribution in the no sample state, the humidity distribution at the time of the test shows a clearly abnormal humidity distribution as compared with the no sample state. It is also possible to notify the abnormality by the alarm 20 connected to the control device 11. The alarm 20 can use various means such as light, sound, or displaying an error on the display. It is also possible for the user to deal with the abnormality notified by the alarm 20 manually, or to automatically stop the test.

In the present invention, as described above, the temperature measured by the temperature sensor 10 is the wet bulb temperature, but an experiment is performed to confirm that this is appropriate. An Espec constant temperature and humidity chamber SH241 (No. 92002706, manufactured in 2004) was used for the experiment. Attach T-type thermocouples to four locations on the inner surface of the inner tank door of the thermo-hygrostat where condensation is likely to occur, and connect the T-type thermocouple to a recorder (DR hybrid recorder manufactured by Yokogawa Electric) Record the temperature inside the inner tank.

The constant temperature and humidity chamber is set to a set temperature of 85 ° C. and a set humidity of 85%, and the temperatures of four locations where T-type thermocouples are attached are measured. Then, the temperature of four places will be 81.0 degreeC, 80.6 degreeC, 80.2 degreeC, and 81.3 degreeC, and the average of four places will be 80.8 degreeC. If this is compared with the theoretical wet bulb temperature, the theoretical wet bulb temperature is 81 ° C., which is substantially the same. Thereby, it can be confirmed that the temperature measured by the T-type thermocouple can be the wet bulb temperature.

In this experiment, when two places where condensation does not occur and the temperature is recorded by the same T-type thermocouple, the temperatures at the two places are 84.9 ° C. and 84.7 ° C. It was found that the temperature was the same as the set temperature. This result indicates that the control device 11 can determine whether the temperature measured by the plurality of temperature sensors 10 is the wet bulb temperature. Therefore, the difference between the temperature measured by the temperature sensor 10 and the set temperature can be used as one reference when determining whether or not the temperature measured by the control device 11 is the wet bulb temperature.

Using the same apparatus, measurement was performed under two conditions: a set temperature of 60 ° C. and a set humidity of 90%, and a set temperature of 60 ° C. and a set humidity of 80%. As a result, when the set temperature is 60 ° C. and the set humidity is 90%, the temperatures at the four locations are 57.5 ° C., 56.9 ° C., 56.6 ° C., and 57.5 ° C. The average of the four locations is 57.1. It becomes ℃. On the other hand, the theoretical wet bulb temperature was 57.9 ° C., which was almost the same. When the set temperature is 60 ° C. and the set humidity is 80%, the temperatures at the four locations are 56.9 ° C., 55.6 ° C., 54.9 ° C., and 57.0 ° C., and the average of the four locations is 56.1 ° C. . On the other hand, the theoretical wet bulb temperature was 55.6 ° C., which was almost the same. However, it can be seen that when the set temperature is lowered from 85 ° C. to 60 ° C., the accuracy is slightly lowered.

In addition, when the same experiment was measured under two conditions of a set temperature of 60 ° C. and a set humidity of 70% and a set temperature of 60 ° C. and a set humidity of 60%, the result was that the set temperature was 60 ° C. and the set humidity was 70%. The average of the four locations is 55.1 ° C., whereas the theoretical wet bulb temperature is 53.1 ° C. In addition, when the set temperature is 60 ° C. and the set humidity is 60%, the average of the four locations is 56.1 ° C., whereas the theoretical wet bulb temperature is 50.4 ° C. When the set humidity decreases, It can be seen that the error of is large.

From such experiments, it is confirmed that when the constant temperature and humidity chamber 1 of the present invention is used for a test in a high temperature and high humidity state, it is correct to obtain the humidity distribution using the temperature measured by the temperature sensor 10 as the wet bulb temperature. Obviously, it is possible to ensure the required accuracy. Also from this, as described at the beginning, the constant temperature and humidity chamber of the present invention is preferably used in a test in a high temperature and high humidity state.

DESCRIPTION OF SYMBOLS 1 Constant temperature / humidity machine 2 Inner tank 3 Blower 4 Heater 5 Cooler 6 Humidifier 8 Temperature / humidity measuring means 9 Insulation material 10 Temperature sensor 11 Controller 12 Humidity calculation part 13 Temperature / humidity control part 17 Door 18 Bulkhead 19 Anemometer 20 Alarm 21 Dimple 22 Axial fan 23 Heat pipe

Claims (7)

An inner tub covered with a heat insulating material and provided with a temperature and humidity measuring means for measuring the temperature and humidity at one point inside, and a heater, a cooler, and a humidifier that change the temperature and humidity inside the inner tub And a constant temperature and humidity chamber equipped with a blower and used for testing in a high temperature and high humidity state,
A plurality of temperature sensors are provided on the inner surface of the inner tank, and an anemometer is provided at a predetermined interval from the inner surface of the inner tank.
Control for calculating the humidity distribution inside the inner tub from the temperature and humidity inside the inner tub measured by the temperature and humidity measuring means, the temperature measured by the temperature sensor, and the wind speed measured by the anemometer Equipped with equipment,
The said control apparatus considers temperature measured by the said temperature sensor as wet-bulb temperature, and calculates humidity distribution by considering the temperature measured by the said temperature / humidity measurement means as dry-bulb temperature, The thermo-hygrostat characterized by the above-mentioned. The thermo-hygrostat according to claim 1, wherein the temperature sensor is provided in a place where condensation occurs in the inner tank. The thermo-hygrostat according to claim 1, wherein condensation occurs at a place where the temperature sensor is provided. The control device extracts the measurement temperature determined to be in a dew condensation state from the measurement temperatures obtained by a plurality of temperature sensors, and calculates the humidity by considering it as the wet bulb temperature. The constant temperature and humidity chamber according to any one of the above. The humidity distribution obtained by the control device is compared with the set humidity at the time of testing, and the control device controls the heater, humidifier, cooler, and blower so that the humidity distribution approaches the set humidity. The operation is controlled, and the constant temperature and humidity chamber according to any one of claims 1 to 4. Comparing the humidity distribution previously calculated in the sample-free state with the humidity distribution obtained at the time of the test by the control device, and providing an alarm that notifies the abnormality when it is determined that the humidity distribution at the time of the test is abnormal. The thermo-hygrostat according to any one of claims 1 to 5, characterized in that The thermo-hygrostat according to any one of claims 1 to 6, wherein one humidity sensor, or a dry bulb thermometer and a wet bulb thermometer are used as the temperature and humidity measuring means.

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