JPH07144138A - Environment testing device with auxiliary humidifier control - Google Patents

Abstract

PURPOSE:To surely and automatically operate an auxiliary humidifier by providing control parts corresponding to the control state of a heater and a humidifier and control parts corresponding to the change state in temp. and humidity for the control of the heater and the humidifier and controlling the auxiliary humidifier corresponding to the operating conditions. CONSTITUTION:An auxiliary humidifier control part 34 is provided with control parts 35-40. Each of the control parts 35-38 controls an auxiliary humidifier 3 so that it may be on/off by a heating output signal, on/off by a humidifying output signal, on by the rate of change in temp., and off by the rate of change in humidity. The control part 39 controls the auxiliary humidifier 3 so that it may maintain the present condition when the range of change in temp. and humidity is small. The control part 40 controls the auxiliary humidifier 3 corresponding to the operation of an operating part 31 so that the auxiliary humidifier 3 may be once off and the control parts 35-38 be selected. In this way, the auxiliary humidifier 3 is surely operated, not manually if necessary. Humidity conditions in a testing room is maintained with good precision, and moreover, heat generation from a material to be tested is treated by a little consumption energy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a heater, a humidifier, an auxiliary humidifier for discharging minute water droplets, a cooler, a setting means for setting operating conditions, a blowing means for circulating gas in a test chamber, and the circulating means. A heater controller for detecting the temperature of the gas and controlling the temperature to be a set temperature, and a humidifier controller for detecting the humidity of the gas and controlling the humidity to be the set humidity are provided. The present invention relates to an environmental test device, and more particularly to an automatic operation technology of an auxiliary humidifier.

[0002]

2. Description of the Related Art An environment tester is equipped with an auxiliary humidifier because cooling by a refrigerator is not effective when a heat load is generated in a high humidity environment. This auxiliary humidifier is normally operated by a person operating a manual switch. However, whether or not the auxiliary humidifier needs to be operated is determined by the three factors of "temperature", "humidity" and "heat load" in the environmental test room, so it is necessary to clarify the operating conditions from the past. Was difficult. For this reason, even the instruction manual for the environmental testing device could not be adequately addressed, and a switch selection table depending on the temperature and humidity at no load and at the maximum load in the specifications was attached. As a result, the operation of the auxiliary humidifier is substantially left to the empirical intuition of the user.

However, in such an operating method of the auxiliary humidifier, when the user of the apparatus is changed or the sample entering the room is changed, the switch must be selected each time, and the burden on the user is large. At the same time, the number of operating auxiliary humidifiers became insufficient due to incorrect selection, and the temperature and humidity in the environmental test room could not be maintained, and excessive humidification caused excessive humidity.

On the other hand, as a method of solving such a problem, temperature sensors are provided at the blowout part and the suction part of the air conditioner, and the heat generation load in the room is calculated from the temperature difference and the air volume of the blower, and if necessary. A control method for automatically turning on / off the auxiliary humidifier has been proposed (see Japanese Patent Publication No. 4-72135). However, in this method, the temperature of the suction port is affected by the shape and installation position of the sample, and when the sample is nearby, it is also affected by the radiant heat from it, so it is unstable and cannot be detected accurately, so There is a problem that it is difficult to accurately calculate the indoor load. In addition, the operation of the auxiliary humidifier may not always be properly controlled for various operating conditions only by using the indoor load as a guide.

[0005]

SUMMARY OF THE INVENTION The present invention solves the above problems in the prior art, and provides an environmental test device in which the auxiliary humidifier can be reliably operated when necessary without human operation. This is an issue.

[0006]

In order to solve the above problems, the present invention provides a heater, a humidifier, an auxiliary humidifier for discharging minute water droplets, a cooler, a setting means for setting operating conditions, and a gas in a test chamber. And a heater control unit that detects the temperature of the circulating gas and controls the temperature to be a set temperature, and detects the humidity of the gas and controls the humidity to be the set humidity. In the environment test apparatus having a humidifier control unit for controlling the auxiliary humidifier corresponding to the operating condition set by the setting unit, the heating output signal of the heater control unit is a predetermined value. When the time reaches a predetermined value or less, the auxiliary humidifier is operated, and when the time exceeds a predetermined time, the auxiliary humidifier is controlled to stop the auxiliary humidifier, and the humidification output signal of the humidifier control unit is a predetermined time. Above a certain value Then, the auxiliary humidifier is operated and the auxiliary humidifier is controlled to stop the auxiliary humidifier for a predetermined time or less, and the heating output signal is 0 and the detected temperature is the set temperature for a predetermined time. A temperature change rate corresponding control unit for controlling the auxiliary humidifier to operate when the predetermined temperature becomes higher, and the auxiliary humidifier when the humidification output signal is 0 and the detected humidity is higher than the set humidity for a predetermined time by a predetermined humidity. It is characterized by having a control means provided with a humidity change rate corresponding control unit for controlling so as to stop.

[0007]

The auxiliary humidifier of the environmental test device is operated properly at a necessary time by controlling it according to the temperature, humidity and heat load of the test chamber to be controlled. According to the present invention, the control means for controlling the auxiliary humidifier has a control unit corresponding to the control states of the heater and the humidifier, and the control corresponding to the change state of the temperature and humidity for the control of the heater and the humidifier. Since the auxiliary humidifier corresponding to the operating conditions is controlled, the temperature and humidity of the test room are stable,
It is possible to appropriately control the operation of the auxiliary humidifier in response to the changing state and the magnitude of the heat load generated from the test object. According to the control means for such an auxiliary humidifier, it is not necessary to include in the control element the amount of heat generated in the test chamber, which cannot be accurately detected. Never be.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS FIG. 1 shows a schematic structure of a thermo-hygrostat with an auxiliary humidifier, which is an example of an environmental test device, and FIG. 2 shows a control device part thereof. The thermo-hygrostat is a heater 1, a humidifier 2, an auxiliary humidifier 3 that discharges minute water droplets, a refrigerant evaporator 4 that serves as a cooler, and a fan 6 that serves as an air blower that circulates the gas in the test chamber 5 and its A motor 7 and dry-bulb and wet-bulb temperature sensors 8 and 9 for detecting the temperature and humidity of the circulating gas are provided, and these are air-conditioned in a main body 12 surrounded by a heat insulating wall 11 whose one surface is a door 10. It is arranged in the chamber 13. Body 1
Below 2 is a machine room 14, in which a refrigeration circuit (not shown) including a compressor, a condenser and the like is provided. A control panel 20 on which operation / control equipment is arranged is provided on the side of the main body 12.

Electric heaters are used for the heater 1 and the humidifier 2, and power is supplied from a power distribution device (not shown) in the control panel 20. Normally, a plurality of auxiliary humidifiers 3 are provided, and they are, for example, ultrasonic humidifiers, and ultrasonic waves generated from an ultrasonic generator (not shown) in the control panel 20 are introduced into the air conditioning chamber 13 by a bellows tube or the like. Dry-bulb and wet-bulb temperature sensors 8, 9
The installation position of is provided near the air outlet from which the conditioned air is blown from the air conditioning chamber 13 side in the test chamber 5 so as not to be affected by the shape and installation position of the sample, radiant heat, and the like.

The control panel 20 is provided with a control device 30 as shown in FIG. The control device 30 includes a setting switch for setting temperature and humidity and an operation unit 31 as setting means for setting operating conditions including an operation pattern switch for changing these in a step shape or a lamp shape, a dry bulb and a wet bulb. The heater controller 32 and the humidifier controller 33 that control the supply voltage to the heater and the humidifier so that the temperature and humidity detected by the temperature sensors 7 and 8 are set values, and the operation set by the operation unit 31. The auxiliary humidifier controller 34 is provided as a control means for controlling the auxiliary humidifier 3 according to the conditions.

The auxiliary humidifier control unit 34 includes a heater corresponding control unit 35, a humidifier corresponding control unit 36, a temperature change rate corresponding control unit 37, a humidity change rate corresponding control unit 38, and in the present embodiment. It has a reset control unit 39 and an overall control unit 40 that totally controls the control operations of these control units in accordance with the set operating conditions. The auxiliary humidifier control unit 34 including such control units is configured integrally with, for example, a microcomputer.

FIG. 3 is a moist air diagram for explaining the function of the auxiliary humidifier 3. This figure is a diagram for explaining that the auxiliary humidifier 3 works effectively when there is a heat load in high-humidity operation. The solid line shows the case where the auxiliary humidifier 3 is operated, and the chain line is stopped. Indicate the case. At the outlet A point from the air-conditioning chamber 13, air-conditioned moist air having a temperature of 60 ° C. and a relative humidity of 95% is blown out, and this moist air absorbs a heat generation load from the sample in the test chamber 5, When the temperature rises at a constant absolute humidity and reaches the suction port B of the air-conditioning room 13 and the auxiliary humidifier 3 is not used, the humidifier 1 humidifies a large amount in order to obtain the temperature / humidity condition of the blowout port A. After being cooled to the point C, the evaporator 4 cooled in the refrigeration circuit significantly cools and dehumidifies it to the point D, blows it out by the blower 6 and heats it by its power and then absorbs the heat of the point A again. It becomes a state.

When only the humidifier 1 is used in this way, the amount of dehumidification in the evaporator 4 becomes very large, a large refrigerating capacity is required, and the amount of humidification also becomes large. Therefore, as shown by the solid line in the figure, the humidifier 1 humidifies the E point to a certain degree, and the evaporator 4 cools and dehumidifies to the F point to such an extent that the D point can be obtained by the auxiliary humidifier. After that, an auxiliary humidifier such as an ultrasonic humidifier or a spray humidifier releases minute water droplets, evaporates the minute water droplets, and the latent heat thereof cools and humidifies the humid air to a point F at a substantially constant enthalpy. By using the auxiliary humidifier in this way, it is possible to effectively handle the heat generation load at high humidity, which is difficult to cool with a refrigerator, and reduce the energy consumption of the refrigerator.

The auxiliary humidifier control unit 34 performs control utilizing the characteristics of the auxiliary humidifier 3 as described above. In the heating device corresponding control part 35, the heating output signal of the heating device control part 32 is set to a predetermined value, for example, 1 minute
When it becomes the following, the auxiliary humidifier 3 is sequentially turned on, and during the same time, for example, when the predetermined value becomes 80% or more, the auxiliary humidifier 3 is sequentially turned off. When the low heating output signal continues for a long time, it is possible to determine that the heat carried in by the load has not been fully removed by the refrigerator, so the ON control in this is effective when the auxiliary humidifier 3 is turned on. This is because of latent heat cooling. On the other hand, if the high output continues for a long time, there is no heat generation from the load and it is judged that cooling by the auxiliary humidifier is unnecessary, so this is turned off.

The humidifier-corresponding control unit 36 is a humidifier control unit 3.
When the humidification output signal of 3 reaches a predetermined value of, for example, 1 minute and reaches a predetermined value of, for example, 95% or more, the auxiliary humidifier 3 is sequentially turned on, and when the predetermined value of the same time becomes, for example, 5% or less, the auxiliary humidifier 3 is sequentially turned off. Control to. This is because in such a state, the humidifying control can be performed quickly and accurately by using or stopping the use of the auxiliary humidifier.

The temperature change rate control unit 37 turns on the auxiliary humidifier 3 sequentially when the heating output signal is 0 and the detected temperature becomes higher than the set temperature by 0.1 ° C. as the predetermined temperature, for example, 5 minutes. To control. For example, when the temperature suddenly drops in a stepwise manner, the heating output signal is set to 0 even if there is no heating load.
It is not preferable to control by 4. However, if there is a heat load, the temperature will not easily drop only by cooling with the refrigerator, so if the difference from the set value does not decrease, it is determined that the heat load is large and the auxiliary humidifier is used. To drive.

The humidity change rate correspondence control unit 38 sequentially turns off the auxiliary humidifier 3 when the humidification output signal is 0 and the detected humidity becomes a predetermined time, for example, 5 minutes, and the detected humidity becomes higher than the set humidity by a predetermined humidity, for example, 1% relative humidity. To control. For example, when the humidity is suddenly dropped in steps, the humidification output signal is set to 0 even when there is a heat load and the auxiliary humidifier needs to be used. Therefore, it is not preferable to control the humidifier-corresponding control unit 34. Therefore, with this control, the case where the auxiliary humidifier is unnecessary is detected and turned off.

When the temperature and humidity are suddenly changed by the operation unit 31, for example, when the temperature change width is 5 ° C. or less or the humidity change width is 10% or less, the reset control unit 39 maintains the state before the change. To control. In order to reduce the control disturbance, it is desirable to provide such a control unit.

The overall control unit 40 turns off the auxiliary humidifier 3 or selects and controls each of the control units 35 to 39 in response to the operation of the operation unit 31. The auxiliary humidifier control unit 34 as described above controls as follows in response to the operation of the operation unit 31.

1. When the temperature and humidity are stable The auxiliary humidifier 3 is sequentially turned on / off by the heater-compatible controller 35.
It is turned off, and the auxiliary humidifier 3 is sequentially turned off by the humidifier-corresponding control unit 36.

2. During temperature / humidity step transition In step transition, the temperature or humidity is rapidly changed in a stepwise manner. 1) When the temperature rises Turn off the auxiliary humidifier 3. This is because the follow-up of the temperature rise of the sample with respect to the temperature rise of the test chamber is delayed and a temperature difference occurs during that time, and the temperature of the sample becomes relatively low, so that dew condensation on the sample is prevented. 2) At the time of temperature drop Controlled by the reset control unit 39, and when the temperature is out of the control range, the auxiliary humidifier 3 is turned off once. Then, control is performed by the temperature change rate correspondence control unit 37 or the humidity change rate correspondence control unit 38. 3) When the temperature is stable and only the humidity is increased or decreased, it is controlled by the reset control unit 39, and when it is out of the control range, the auxiliary humidifier 3 is turned off once. Further, it is turned on / off by the heater corresponding control unit 35, and further turned off by the humidity change rate corresponding control unit 38.

3. During temperature / humidity lamp transfer During lamp transfer, the temperature or humidity changes gradually over time. At this time, since the change is not abrupt, the present condition is maintained and the control by the reset control unit 39 is not performed, the auxiliary humidifier 3 is sequentially turned on / off by the heater corresponding control unit 35, and the humidifier corresponding control unit 36. The auxiliary humidifier 3 is sequentially turned off or turned on. However, since the temperature and humidity are changing at this time, in order to avoid repeated on / off, once all the auxiliary humidifiers 3 are turned off, the state is maintained until the next step. By the above control,
The ON / OFF control of the auxiliary humidifier 3 can be performed automatically and accurately for all operation patterns.

FIG. 4 shows a processing flow of the above three types of operation patterns when the temperature and humidity are stable, that is, after the set temperature and humidity are once reached. It is determined whether the output signal for heating control is the specified value A, for example, 2% or less (S-1), and when it is below, it is determined whether the timer is counting (S-2) and counting is in progress. If there is, continue counting and 2
% Or less to determine if the time is up (S-3, 4), and if the time is up, determine whether all auxiliary humidifiers are on (S-5). If not, one unit is turned on (S-6), the timer is reset (S-7), the same process is repeated from (S-1), and the auxiliary humidifiers are sequentially turned on.

If the heating output is not below the specified value A, the timer is reset and the heating output is set to the specified value B, for example, 8
It is judged whether it is 0% or more (S-8, 9), and as in the case of the specified value A, when 80% or more continues for a certain time, the auxiliary humidifiers are sequentially turned off one by one by the timer (S- 1
0-14, 7 etc.). If the heating output is not less than the specified value B, the timer is reset and it is determined whether the humidification output is 5% or less as the specified value C (S-15, 16).
As with the case of the specified value A, if 5% or less continues for a certain time, the auxiliary humidifier is turned off sequentially by the timer (S-1
7-19, S-13, 14, 7, etc.).

FIG. 5 shows a processing flow at the time of shifting to the temperature / humidity step among the three types of operation patterns. Whether the temperature has risen or not is judged, and if the temperature rises, all the auxiliary humidifiers are turned off (S-1, 2). If the temperature is not increased, it is determined whether the temperature is decreased (S-3). If the temperature is decreased, it is determined whether the step width D of the decrease is 5 ° C. or more (S-4), and the step width D is If it is largely 5 ° C or more, it is judged whether the heating output is 0% by turning off all the auxiliary humidifiers (S-5, 6). If the heating output is 0%, it is judged by the timer whether the time is up (S-7 ~
9) If the time is up, it is judged whether or not the detected temperature is higher than the set value and the difference, for example, 0.1 ° C is not reduced (S-10), and if not, the heat generation load is effectively processed. Therefore, the auxiliary humidifiers are sequentially turned on one by one (S-11 to 13, 1 to 10).

If the heating output is not 0%, the timer is reset to judge whether the humidification output is 0% (S-1
4, 15), if this is 0%, it is judged whether or not the time is up by a timer (S-16 to 18), and if the time is up, the detected humidity is higher than the set value and, for example, the relative humidity is 1 It is judged whether the% does not shrink (S-19), and when it does not shrink, the auxiliary humidifiers are sequentially turned off one by one (S-20, 21, 13, 1-).
5, 14-19).

When the temperature is not rising / falling, it is judged whether the humidity is constant (S-22), and when the humidity changes, it is judged whether the change width E is, for example, 10% or more relative humidity (S). -23) When 10% or more and there is a large change, turn off all auxiliary humidifiers (S-2
4) When the change width is 10% or less and small, the auxiliary humidifier is not turned off in order to prevent control disturbance, and the heater corresponding control flow shown in FIG. 4 is executed (S-1 in FIG. 5).
4) The following flow of humidity change rate control is executed (S-25, 26).

FIG. 6 shows a processing flow at the time of shifting to the temperature / humidity lamp. Since the change in temperature and humidity is gradual at the time of transition to the lamp, the process is basically the same as the process at the time of stable temperature and humidity shown in FIG. It is determined whether all the auxiliary humidifiers are off (S-1), and if all are off, that state is maintained to avoid repeated on / off (EN
D). If not all off, the processing flow of FIG. 4 is executed (S-2 to 9). If the humidification output is not below the specified value C, the timer is reset (S-10),
It is judged whether or not the humidification output is, for example, a relative humidity of 100% or more as a specified value F (S-11), and if it is 100% or more, the auxiliary humidifiers are sequentially turned on by the timer (S-11).
-12-17).

[0029]

As described above, according to the present invention, by providing the auxiliary humidifier control means utilizing the control signals of the heater and the humidifier, it is possible to surely perform the operation when the person does not need the operation. It is possible to operate the auxiliary humidifier, maintain the humidity condition in the test chamber with high accuracy, and process heat generated from the material under test with low energy consumption.

[Brief description of drawings]

FIG. 1 is an explanatory view showing a schematic structure of a high temperature constant temperature oven with an auxiliary humidifier.

FIG. 2 is a block diagram showing a configuration of a control device for the high temperature constant temperature bath.

FIG. 3 is a part of a moist air diagram for explaining the effect of the auxiliary humidifier.

FIG. 4 is a flowchart when the temperature and humidity of the auxiliary humidifier control unit are stable.

FIG. 5 is a flowchart when the temperature / humidity step of the control unit is changed.

FIG. 6 is a flow chart when the control unit shifts to a temperature / humidity lamp.

[Explanation of symbols]

 1 Heater 2 Humidifier 3 Auxiliary Humidifier 4 Refrigerant Evaporator (Cooler) 5 Test Room 6 Fan (Blower) 31 Operation Unit 32 Heater Control Unit 33 Humidifier Control Unit 34 Auxiliary Humidifier Control Unit (Control Unit) 35 Heater Corresponding Control Unit 36 Humidifier Corresponding Control Unit 37 Temperature Change Rate Corresponding Control Unit 38 Humidity Change Rate Corresponding Control Unit 39 Reset Control Unit 40 Overall Control Unit (Control Unit)

Claims (1)

[Claims] 1. A heater, a humidifier, an auxiliary humidifier for releasing minute water droplets, a cooler, a setting means for setting operating conditions, a blowing means for circulating gas in a test chamber, and a temperature of the circulating gas are detected. In the environmental test device, comprising: a heater control unit that controls the temperature to a set temperature; and a humidifier control unit that detects the humidity of the gas and controls the humidity to the set humidity. Control means for controlling the auxiliary humidifier in accordance with the operating conditions set by the setting means, wherein the auxiliary humidifier is operated for a predetermined time when the heating output signal of the heater control unit falls below a predetermined value for a predetermined time. A heater-corresponding control unit that controls to stop the auxiliary humidifier when the temperature exceeds a predetermined value,
A humidifier-corresponding control unit that controls the auxiliary humidifier to operate when the humidification output signal of the humidifier control unit is equal to or greater than a predetermined value for a predetermined time and to stop the auxiliary humidifier when the signal is equal to or less than a predetermined value for a predetermined time, When the heating output signal is 0 and the detection temperature is higher than the set temperature by a predetermined temperature for a predetermined time, a temperature change rate corresponding control unit that controls the auxiliary humidifier to operate, and the humidification output signal is 0 and the detection is performed for a predetermined time. An environmental test apparatus comprising: a control unit including: a humidity change rate corresponding control unit that controls the auxiliary humidifier to stop when the humidity becomes higher than the set humidity by a predetermined humidity.