CN106843337B - Temperature rise and humidification control system of constant temperature and humidity test box and control method thereof - Google Patents
Temperature rise and humidification control system of constant temperature and humidity test box and control method thereof Download PDFInfo
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- CN106843337B CN106843337B CN201710173125.8A CN201710173125A CN106843337B CN 106843337 B CN106843337 B CN 106843337B CN 201710173125 A CN201710173125 A CN 201710173125A CN 106843337 B CN106843337 B CN 106843337B
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- G05—CONTROLLING; REGULATING
- G05D—SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES
- G05D27/00—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00
- G05D27/02—Simultaneous control of variables covered by two or more of main groups G05D1/00 - G05D25/00 characterised by the use of electric means
Abstract
The invention discloses a temperature rise and humidification control system of a constant temperature and humidity test box and a control method thereof. The invention can solve the problems of delay of humidification response, large overshoot deviation of humidity in the stage of starting humidification and unstable humidity control in the stage of low temperature humidity, and ensures the reliability of test data.
Description
Technical Field
The invention relates to the technical field of test chamber equipment, in particular to a temperature rise and humidification control system of a constant temperature and humidity test chamber and a control method thereof.
Background
The constant temperature and humidity test box is a device for detecting the performance of a product under a certain constant temperature and humidity state so as to detect whether the performance of the product meets the requirements of relevant standards.
In the test process, in order to reach the preset temperature and humidity, the constant temperature and humidity test box needs to be provided with a corresponding temperature adjusting device and a corresponding humidity adjusting device to adjust the temperature and the humidity. However, the existing constant temperature and humidity test box has the following defects: 1. when the humidity is increased from the low-temperature humidity stage to the high-temperature humidity stage, if the humidification operation is suddenly started, the humidification response is delayed, and the humidity in the constant-temperature and constant-humidity test box cannot quickly and stably reach the preset test requirement; 2. in the low-temperature humidity stage, the required humidification amount of the set humidity is small, and in the normal adjustment state of the humidifier, the moisture conveying amount is large, so that the control is not fine, and the control is unstable. 3. At the initial stage of raising the humidity, because the equipment design is unreasonable, a large amount of steam enters the constant temperature and humidity test box, so that the humidity in the box is greatly fluctuated, the problem of large humidity overshoot deviation is generated, and the reliability of test data is influenced.
Disclosure of Invention
The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and provides a temperature-rise and humidity-rise control system of a constant temperature and humidity test chamber and a control method thereof, which can solve the problems of a delay in humidity response, a large overshoot deviation of humidity at the beginning of humidity rise, and an unstable humidity control at the low-temperature humidity stage.
In order to achieve the above object, a first aspect of the present invention provides a temperature-rise and humidification control system for a constant temperature and humidity test chamber, including a constant temperature and humidity test chamber for product testing, a humidification water tank disposed outside the constant temperature and humidity test chamber, and a controller for controlling the actions of each component in the constant temperature and humidity test chamber and the humidification water tank, wherein a stirring fan, a test chamber heater, a humidity sensor, a temperature sensor, and a test chamber evaporator for refrigeration and dehumidification are disposed inside the constant temperature and humidity test chamber, the stirring fan, the test chamber heater, the humidity sensor, the temperature sensor, and the test chamber evaporator are electrically connected to the controller, a water temperature heater and a water temperature sensor are disposed inside the humidification water tank, the water temperature heater and the water temperature sensor are electrically connected to the controller, and the humidification water tank is communicated to the.
Preferably, a temperature reducing device electrically connected with the controller is further arranged inside the humidification water tank.
Preferably, the water temperature reducing device comprises a water temperature reducing evaporator, a radiator or an electronic refrigerator.
Preferably, the periphery of the constant temperature and humidity test box is provided with a heat insulation layer.
Preferably, the steam outlet end of the main steam pipeline extending into the constant temperature and humidity test box is connected with a steam uniform distribution pipe for ensuring the uniformity of the humidity in the constant temperature and humidity test box.
Preferably, a first switch valve electrically connected with the controller is connected to the main steam pipeline.
Preferably, the humidifying water tank is further provided with an auxiliary steam pipeline, the pipe diameter of the auxiliary steam pipeline is smaller than that of the main steam pipeline, one end of the auxiliary steam pipeline is communicated with the interior of the humidifying water tank, the other end of the auxiliary steam pipeline is connected to the steam outlet end of the main steam pipeline or directly connected to the constant-temperature and constant-humidity test box and communicated with the interior of the constant-temperature and constant-humidity test box, and the auxiliary steam pipeline is connected with a second switch valve which is electrically connected with the controller.
The second aspect of the present invention provides a temperature-rise and humidification control method for a constant-temperature and constant-humidity test chamber, which is applied to the temperature-rise and humidification control system for a constant-temperature and constant-humidity test chamber in the above technical solution, and includes the following steps:
when a constant temperature and humidity test box performs a low temperature and humidity test on a test product, controlling the temperature in the constant temperature and humidity test box to be stabilized at a first preset temperature value, controlling the water temperature of a humidifying water tank to be in a lower temperature range of 20-80 ℃, and controlling the opening and closing of a second switch valve on an auxiliary steam pipeline to stabilize the humidity in the constant temperature and humidity test box;
step two, in the process that the constant temperature and humidity test box is increased from a first preset temperature value to a second preset temperature value, controlling the water temperature of the humidifying water tank to be gradually increased, and controlling the opening and closing of a second switch valve and/or a first switch valve to enable the humidity in the constant temperature and humidity test box to be stable;
step three, before the constant temperature and humidity test chamber needs large humidification capacity, the water temperature in the humidification water tank is controlled in advance, so that the water temperature gradually rises from a lower temperature to a state close to boiling, and advanced preparation of a large amount of humidification operations is completed;
and step four, when the constant temperature and humidity test chamber needs large humidification amount, opening the first switch valve or simultaneously opening the first switch valve and the second switch valve to enable steam in the humidification water tank to quickly enter the constant temperature and humidity test chamber through the corresponding steam pipeline, and controlling the water temperature heater to act by the controller to realize automatic control of humidification amount.
Preferably, the near boiling state has a water temperature value of 80 ℃ or higher and less than the boiling point.
Preferably, in the whole control process, the controller calculates the collected temperature and humidity in the constant temperature and humidity test chamber and the water temperature of the humidification water tank with respective corresponding set values in a PID control mode, outputs a control heating amount, a humidification amount and a refrigeration amount, and converts the control heating amount, the humidification amount and the refrigeration amount obtained by PID calculation to execute corresponding control operation.
Compared with the prior art, the invention has the beneficial effects that:
in the invention, before the constant temperature and humidity test chamber rises from the low temperature and humidity stage to the high temperature and humidity stage and needs large humidification amount, the controller can control the water temperature in the humidification water tank to gradually rise to a state close to boiling in advance so as to finish the advance preparation of humidification operation, when a high-temperature humidity test stage is carried out, steam in the humidifying water tank can quickly enter the constant-temperature constant-humidity test chamber through the steam pipeline, so that the humidity in the constant-temperature constant-humidity test chamber can quickly rise to a humidity value meeting the test requirement, the problem of delayed humidifying response is solved, meanwhile, at the beginning stage of humidity rising, water in the humidifying water tank is not boiled, a large amount of steam cannot enter the constant-temperature and constant-humidity test box when the switch valve is opened, the humidity in the box is prevented from being greatly fluctuated, the problem that the humidity overshoots and deviates greatly at the beginning stage of humidity rising is solved, and the reliability of test data is ensured.
In addition, in the low-temperature humidity stage, an auxiliary steam pipeline with a small pipe diameter can be selected for conveying steam, so that the conveying amount of moisture can be easily controlled when the required humidification amount is small, and the humidity control is stable.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a schematic structural diagram of a temperature rise and humidification control system of a constant temperature and humidity test chamber provided by the invention;
fig. 2 is a control circuit diagram of a temperature-rise and humidification control system of the constant temperature and humidity test chamber provided by the invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, an embodiment of the present invention provides a temperature-rise and humidity-rise control system for a constant temperature and humidity test chamber, which includes a constant temperature and humidity test chamber 1 for product testing, a humidity water tank 2 disposed outside the constant temperature and humidity test chamber 1, and a controller 3 for controlling the actions of each component in the constant temperature and humidity test chamber 1 and the humidity water tank 2, and the following will describe each component of this embodiment in detail with reference to the accompanying drawings.
The inside of constant temperature and humidity test case 1 is equipped with stirring fan 4, test case heater 5, humidity transducer 6, temperature sensor 7 and is used for the test case evaporimeter 8 of refrigeration and dehumidification, and the periphery of constant temperature and humidity test case 1 is equipped with heat preservation 15.
The inside of humidification water tank 2 is equipped with water temperature heater 9 and water temperature sensor 10, and the inside of humidification water tank 2 can be linked together through main steam pipe 11 and the inside of constant temperature and humidity proof box 1, is connected with first ooff valve 12 on the main steam pipe 11.
In order to adjust the water temperature of the humidifying water tank, a water temperature reducing device 13 can be arranged inside the humidifying water tank 2. In the present embodiment, the temperature reducing device 13 may preferably adopt a temperature reducing evaporator, a radiator or an electronic refrigerator.
Preferably, a steam outlet end of the main steam pipeline 11 extending into the constant temperature and humidity test chamber 1 is connected with a steam distribution pipe 14 for ensuring the uniformity of the humidity in the constant temperature and humidity test chamber 1.
As shown in fig. 2, the controller 3 may be electrically connected to the stirrer fan 4, the test chamber heater 5, the humidity sensor 6, the temperature sensor 7, the test chamber evaporator 8, the water temperature heater 9, the water temperature sensor 10, the first switching valve 12, and the precipitation temperature device 13, respectively.
In addition, the system can also be provided with an auxiliary steam pipeline 16 and a second switch valve 17 electrically connected with the controller 3, the pipe diameter of the auxiliary steam pipeline 16 is smaller than that of the main steam pipeline 11, one end of the auxiliary steam pipeline 16 is communicated with the inside of the humidifying water tank 2, the other end of the auxiliary steam pipeline 16 is connected to the steam outlet end of the main steam pipeline 11 or directly connected to the constant temperature and humidity test box 1 and communicated with the inside of the constant temperature and humidity test box, and the second switch valve 17 is connected to the auxiliary steam pipeline 16. In actual operation, the main steam pipeline 11 may be used for steam circulation in a high temperature and humidity test stage, and the auxiliary steam pipeline 16 may be used for steam circulation in a low temperature and humidity test stage, or may be used for steam circulation in a high temperature and humidity test stage together with the main steam pipeline 11.
When the constant temperature and humidity test box works, the controller 3 can control the test box evaporator 8 to refrigerate and dehumidify and control the test box heater 5 to dynamically heat so that the constant temperature and humidity test box 1 reaches the required temperature and control the water temperature heater 9 in the humidification water tank 2 to dynamically heat so that steam is generated and enters the constant temperature and humidity test box 1, and the humidity in the constant temperature and humidity test box 1 reaches the required humidity; meanwhile, the controller 3 can also control the size of the steam entering the constant temperature and humidity test box 1 through a switch valve.
The embodiment of the invention also provides a temperature-rise and humidification control method of the constant-temperature and constant-humidity test chamber, which is applied to a temperature-rise and humidification control system of the constant-temperature and constant-humidity test chamber and comprises the following steps:
when the constant temperature and humidity test box 1 performs a low temperature and humidity test on a test product, controlling the temperature in the constant temperature and humidity test box 1 to be stabilized at a first preset temperature value, controlling the water temperature of the humidification water tank 2 to be in a lower temperature range of 20-80 ℃, and controlling the opening and closing of a second switch valve 17 on the auxiliary steam pipeline 16 to stabilize the humidity in the constant temperature and humidity test box 1;
step two, in the process that the constant temperature and humidity test box 1 is increased from a first preset temperature value to a second preset temperature value, controlling the water temperature of the humidifying water tank 2 to be gradually increased, and controlling the opening and closing of the second switch valve 17 and/or the first switch valve 12 to enable the humidity in the constant temperature and humidity test box 1 to be stable; wherein, the process of gradually rising the water temperature is also the humidification preparation process of the next stage;
step three, before the constant temperature and humidity test box 1 needs large humidification quantity, the water temperature in the humidification water tank 2 is controlled in advance, so that the water temperature gradually rises from a lower temperature to a state close to boiling, and advanced preparation of a large amount of humidification operations is completed;
and step four, when the constant temperature and humidity test box 1 needs large humidification amount, opening the first switch valve 12 or simultaneously opening the first switch valve 12 and the second switch valve 17 to enable steam in the humidification water box 2 to quickly enter the constant temperature and humidity test box 1 through the corresponding steam pipeline, and at the moment, the controller 3 controls the water temperature heater 9 to act to realize automatic control of humidification amount.
In this embodiment, the value of the water temperature near boiling may be greater than or equal to 80 ℃ and less than the boiling point.
In the whole control process, the controller 3 can calculate the collected temperature and humidity in the constant temperature and humidity test chamber 1 and the water temperature in the humidification water tank 2 with respective corresponding set values in a PID control mode, output control heating quantity, humidification quantity and refrigeration quantity, and convert the control heating quantity, humidification quantity and refrigeration quantity obtained by PID calculation to execute corresponding control operation.
A detailed description will be given below of a practical example.
When the constant temperature and humidity test box performs a low temperature and humidity test of-35 ℃ on a test product, controlling the humidity in the constant temperature and humidity test box to keep 30 Rh% unchanged;
in the process that the temperature in the constant temperature and humidity test box is gradually increased from-35 ℃ to 50 ℃, the temperature of water in the humidifying water tank is controlled to be gradually increased in advance, so that the temperature of water is gradually increased to 95 ℃ to finish the advanced preparation of a large amount of humidifying operations;
when the temperature in the constant temperature and humidity test box is just 50 ℃ and large humidification is needed, the first switch valve is opened, steam in the humidification water tank can enter the constant temperature and humidity test box through the first steam pipeline quickly, and therefore the humidity in the constant temperature and humidity test box can rise to 80 Rh% from 30 Rh% quickly.
In conclusion, the controller can control the temperature of the water in the humidifying water tank to gradually rise to a state close to boiling in advance before the constant temperature and humidity test chamber rises from a low temperature humidity stage to a high temperature humidity stage and needs large humidifying amount, so as to complete the advance preparation of the humidifying operation, when a high-temperature humidity test stage is carried out, steam in the humidifying water tank can quickly enter the constant-temperature constant-humidity test chamber through the steam pipeline, so that the humidity in the constant-temperature constant-humidity test chamber can quickly rise to a humidity value meeting the test requirement, the problem of delayed humidifying response is solved, meanwhile, at the beginning stage of humidity rising, water in the humidifying water tank is not boiled, a large amount of steam cannot enter the constant-temperature and constant-humidity test box when the switch valve is opened, the humidity in the box is prevented from being greatly fluctuated, the problem that the humidity overshoots and deviates greatly at the beginning stage of humidity rising is solved, and the reliability of test data is ensured. In addition, in the low-temperature humidity stage, an auxiliary steam pipeline with a small pipe diameter can be selected for conveying steam, so that the conveying amount of moisture can be easily controlled when the required humidification amount is small, and the humidity control is stable.
The above embodiments are preferred embodiments of the present invention, but the present invention is not limited to the above embodiments, and any other changes, modifications, substitutions, combinations, and simplifications which do not depart from the spirit and principle of the present invention should be construed as equivalents thereof, and all such changes, modifications, substitutions, combinations, and simplifications are intended to be included in the scope of the present invention.
Claims (7)
1. A temperature rise and humidification control system of a constant temperature and humidity test box is characterized by comprising a constant temperature and humidity test box (1) for product testing, a humidification water tank (2) arranged outside the constant temperature and humidity test box (1) and a controller (3) for controlling the actions of all components in the constant temperature and humidity test box (1) and the humidification water tank (2), the interior of the constant temperature and humidity test box (1) is provided with a stirring fan (4), a test box heater (5), a humidity sensor (6), a temperature sensor (7) and a test box evaporator (8) for refrigeration and dehumidification which are respectively and electrically connected with the controller (3), a water temperature heater (9) and a water temperature sensor (10) which are respectively and electrically connected with the controller (3) are arranged in the humidifying water tank (2), the interior of the humidifying water tank (2) is communicated with the interior of the constant-temperature and constant-humidity test box (1) through a main steam pipeline (11);
the main steam pipeline (11) is connected with a first switch valve (12) which is electrically connected with the controller (3);
an auxiliary steam pipeline (16) is further arranged on the humidification water tank (2), the pipe diameter of the auxiliary steam pipeline (16) is smaller than that of the main steam pipeline (11), one end of the auxiliary steam pipeline (16) is communicated with the interior of the humidification water tank (2), the other end of the auxiliary steam pipeline (16) is connected to the steam outlet end of the main steam pipeline (11) or directly connected to the constant temperature and humidity test box (1) and communicated with the interior of the constant temperature and humidity test box, and a second switch valve (17) electrically connected with the controller (3) is connected to the auxiliary steam pipeline (16);
the controller (3) is used for controlling the temperature in the constant temperature and humidity test chamber (1) to be stabilized at a first preset temperature value in a low temperature and humidity stage, controlling the water temperature of the humidifying water tank (2) to be in a lower temperature range of 20-80 ℃, and controlling the opening and closing of a second switch valve (17) on the auxiliary steam pipeline (16) to stabilize the humidity in the constant temperature and humidity test chamber (1); the constant temperature and humidity control device is used for controlling the water temperature of the humidifying water tank (2) to gradually rise in the process that the constant temperature and humidity test box (1) rises from a first preset temperature value to a second preset temperature value, and controlling the second switch valve (17) and/or the first switch valve (12) to be switched on and off to enable the humidity in the constant temperature and humidity test box (1) to be stable; and the device is used for controlling the water temperature in the humidifying water tank (3) to gradually rise to a state close to boiling in advance before the constant temperature and humidity test box (1) rises from a low temperature and humidity stage to a high temperature and humidity stage and needs large humidification amount, so as to complete the advanced preparation of humidifying operation, and thus when the high temperature and humidity test stage is carried out and the large humidification amount is needed, the first switch valve (12) or the first switch valve (12) and the second switch valve (17) are controlled to be opened, and steam in the humidifying water tank (2) can quickly enter the constant temperature and humidity test box (1) through the main steam pipeline (11) or the main steam pipeline (11) and the auxiliary steam pipeline (16).
2. The temperature-rise and humidification control system of the constant temperature and humidity test chamber as claimed in claim 1, wherein a temperature-reduction device (13) electrically connected with the controller (3) is further arranged inside the humidification water tank (2).
3. The temperature-rise and humidification control system of the constant temperature and humidity test chamber as claimed in claim 2, wherein the water temperature reduction device (13) comprises a water temperature reduction evaporator, a radiator or an electronic refrigerator.
4. The temperature-rising and humidifying control system of the constant-temperature and constant-humidity test chamber according to claim 1, wherein a steam outlet end of the main steam pipeline (11) extending into the constant-temperature and constant-humidity test chamber (1) is connected with a steam distribution pipe (14) for ensuring the uniformity of the humidity in the constant-temperature and constant-humidity test chamber (1).
5. A temperature-rise and humidification control method of a constant-temperature and constant-humidity test chamber is applied to the temperature-rise and humidification control system of the constant-temperature and constant-humidity test chamber in claim 1, and comprises the following steps:
when a constant temperature and humidity test box (1) performs a low temperature and humidity test on a test product, controlling the temperature in the constant temperature and humidity test box (1) to be stabilized at a first preset temperature value, controlling the water temperature of a humidifying water tank (2) to be in a lower temperature range of 20-80 ℃, and controlling the opening and closing of a second switch valve (17) on an auxiliary steam pipeline (16) to stabilize the humidity in the constant temperature and humidity test box (1);
step two, in the process that the constant temperature and humidity test box (1) is increased from a first preset temperature value to a second preset temperature value, the water temperature of the humidifying water tank (2) is controlled to be gradually increased, and the humidity in the constant temperature and humidity test box (1) is stable by controlling the opening and closing of the second switch valve (17) and/or the first switch valve (12);
step three, before the constant temperature and humidity test box (1) needs large humidification amount, the water temperature in the humidification water tank (2) is controlled in advance, so that the water temperature gradually rises from a lower temperature to a state close to boiling, and a large amount of advance preparation of humidification operation is completed;
and fourthly, when the constant temperature and humidity test box (1) needs large humidification amount, opening the first switch valve (12) or simultaneously opening the first switch valve (12) and the second switch valve (17) to enable steam in the humidification water tank (2) to quickly enter the constant temperature and humidity test box (1) through the corresponding steam pipeline, and controlling the water temperature heater (9) to act by the controller (3) at the moment so as to realize automatic control of humidification amount.
6. The temperature-rise and humidification control method of the constant temperature and humidity test chamber according to claim 5, wherein the water temperature value in the near-boiling state is 80 ℃ or higher and less than the boiling point.
7. The temperature rise and humidification control method of the constant temperature and humidity test chamber according to claim 5, wherein in the whole control process, the controller (3) calculates the collected temperature and humidity in the constant temperature and humidity test chamber (1) and the water temperature of the humidification water tank (2) with respective corresponding set values in a PID control mode, outputs control heating quantity, humidification quantity and refrigeration quantity, and converts the control heating quantity, humidification quantity and refrigeration quantity obtained by PID calculation to execute corresponding control operation.
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| JP6592073B2 (en) * | 2017-12-27 | 2019-10-16 | ファナック株式会社 | Equipment control device |
| CN112240865B (en) * | 2019-07-19 | 2024-01-23 | 上海沃尔沃汽车研发有限公司 | Corrosion test equipment and method for large system-level parts of vehicle |
| CN111765917A (en) * | 2020-07-08 | 2020-10-13 | 重庆盖博试验设备有限公司 | Long-range air supply temperature humidity experimental box |
| CN117074286A (en) * | 2023-09-11 | 2023-11-17 | 广东科明环境仪器工业有限公司 | Method for achieving humidity-heat balance of test box by adopting low-temperature steam and environment test box |
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