CN111013671B - Dynamic heat balance constant temperature and humidity control device and control method - Google Patents
Dynamic heat balance constant temperature and humidity control device and control method Download PDFInfo
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- 238000000034 method Methods 0.000 title claims abstract description 20
- 239000007788 liquid Substances 0.000 claims abstract description 25
- 230000001105 regulatory effect Effects 0.000 claims abstract description 22
- 238000005485 electric heating Methods 0.000 claims abstract description 11
- 238000001704 evaporation Methods 0.000 claims abstract description 11
- 230000008020 evaporation Effects 0.000 claims abstract description 7
- 238000010438 heat treatment Methods 0.000 claims description 18
- 230000001276 controlling effect Effects 0.000 claims description 6
- 229920000049 Carbon (fiber) Polymers 0.000 claims description 3
- 239000004917 carbon fiber Substances 0.000 claims description 3
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 3
- 238000007789 sealing Methods 0.000 claims description 3
- 229910001220 stainless steel Inorganic materials 0.000 claims description 3
- 239000010935 stainless steel Substances 0.000 claims description 3
- 238000000889 atomisation Methods 0.000 claims description 2
- 238000009690 centrifugal atomisation Methods 0.000 claims description 2
- 238000007791 dehumidification Methods 0.000 description 7
- 238000005057 refrigeration Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 238000009833 condensation Methods 0.000 description 2
- 230000005494 condensation Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000149 penetrating effect Effects 0.000 description 2
- 239000013589 supplement Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000012986 modification Methods 0.000 description 1
- 230000010355 oscillation Effects 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L1/00—Enclosures; Chambers
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- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01L—CHEMICAL OR PHYSICAL LABORATORY APPARATUS FOR GENERAL USE
- B01L7/00—Heating or cooling apparatus; Heat insulating devices
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Abstract
The invention discloses a dynamic heat balance constant temperature and humidity control device and a control method, comprising a compressor, an electronic three-way reversing proportional valve, a condenser, a condensing fan, an evaporation pressure regulating valve, a differential pressure valve, a liquid storage device, a liquid supply electromagnetic valve, an electric heater, an evaporator, a circulating fan, a temperature sensor, a humidity sensor, a humidifier, a gas-liquid separator, a crankcase pressure regulating valve, a controller and a test box body, in the invention, the electric heater is used for forcing the temperature in the refrigerator to rise slowly, the system controls the hot airflow according to calculation to force the refrigerating system to increase the refrigerating capacity so as to balance the heat output by electric heating, while realizing constant temperature, the air in the box is guided to the evaporator through the circulating fan, and the humidity is reduced by condensing the moisture in the air, when the relative humidity in the tank reaches the set point, the electric heating output and the humidification output will be at a constant output.
Description
Technical Field
The invention relates to the technical field of test devices, in particular to a dynamic heat balance constant temperature and humidity control device and a control method.
Background
At present, most constant temperature and humidity boxes at home and abroad still use a mode of mutual balance of compressor refrigeration and electric heating to control the temperature, and the high-temperature hot gas resources of a refrigeration system are not effectively utilized.
Most of constant temperature and humidity box manufacturers still adopt an independent refrigeration evaporator to perform refrigeration and dehumidification and an independent humidifier to perform humidification, namely, a refrigeration and dehumidification channel is opened when the system needs dehumidification, the dehumidification is stopped when the set humidity is reached, and the humidifier is opened when the system needs humidification, and the humidification is stopped when the set humidity is reached. The humidity control mode enables the humidity in the box to fluctuate continuously, and the temperature is greatly influenced.
In addition, in some constant temperature and humidity boxes, a mode of combined action of PID dehumidification amount regulation and PID humidification amount regulation is adopted in humidity control, a system calculates the humidification output amount and the dehumidification output amount, the system and the dehumidification output amount are always in a dead cycle of alternating oscillation, and balance cannot be achieved all the time. Therefore, it is necessary to design a dynamic heat balance constant temperature and humidity control device and a control method.
Disclosure of Invention
The invention aims to provide a dynamic heat balance constant temperature and humidity control device and a control method, which realize accurate temperature control of +/-0.5 ℃ fluctuation and accurate humidity control of +/-1% RH fluctuation so as to solve the problems in the background technology.
In order to solve the technical problems, the invention provides the following technical scheme: the dynamic heat balance constant temperature and humidity control device comprises a compressor, an electronic three-way reversing proportional valve, a condenser, a condensing fan, an evaporation pressure regulating valve, a differential pressure valve, a liquid storage device, a liquid supply electromagnetic valve, an electric heater, an evaporator, a circulating fan, a temperature sensor, a humidity sensor, a humidifier, a gas-liquid separator, a crankcase pressure regulating valve, a controller and a test box body, wherein the electric heater, the evaporator, the circulating fan, the temperature sensor, the humidity sensor and the humidifier are sequentially arranged in the test box body from top to bottom, the output end of the evaporator is sequentially connected with the gas-liquid separator, the crankcase pressure regulating valve, the compressor and the electronic three-way reversing proportional valve in a penetrating mode through pipelines, the output end of the electronic three-way reversing proportional valve is connected with the input end of the evaporator, the electronic three-way reversing proportional valve is connected with the condenser, the condenser and the electronic three-way reversing proportional valve, Evaporating pressure regulating valve, reservoir and supply liquid solenoid valve parallel connection, and condenser, evaporating pressure regulating valve and differential pressure valve parallel connection, one side of condenser is provided with the condensation fan, the controller includes PLC or singlechip to and the drive plate, and the input of controller and temperature sensor and humidity transducer's output electric connection, the output of controller and the input electric connection of compressor, electronic tee bend switching-over proportional valve, condenser, condensation fan, supply liquid solenoid valve, electric heater, evaporimeter, circulating fan and humidifier.
A control method of a dynamic heat balance constant temperature and humidity control device comprises the following steps:
step one, calculating the output quantity of a hot gas bypass valve of a refrigerating unit according to the difference value PID of a set temperature TSV and a current temperature TPV;
step two, judging according to the difference value of the set relative humidity HSV and the current relative humidity HPV, assigning the controller to output the heating quantity and regulating the humidification quantity by PID;
step three, controlling heating:
1) loading:
firstly, when the output of the humidifier is continuously less than or equal to A percent and the current humidity HPV-set humidity HSV is more than or equal to 1 percent, the heating power step value is +1 percent;
secondly, after waiting for the working step length of the electric heater to be N seconds, returning to the step 1 of loading, and judging again by system software;
… … until the heating power is 100% output;
2) load shedding:
firstly, when the output of the humidifier is continuously more than or equal to B percent and the set humidity HSV-the current humidity HPV is more than or equal to 1 percent, the heating power step value is-1 percent;
secondly, after waiting for the working step length of the electric heating to be N seconds, returning to the step 1 of load shedding for judging again;
… … until the heating power is 0% output;
step four, controlling humidification:
1) working when the temperature TSV is set to be between 10 and 40 ℃; when the temperature of TSV is less than 10 ℃ or the temperature of TSV is more than 40 ℃, the humidifier loses power;
2) when the set humidity HSV-the current humidity HPV is more than or equal to 1%, the humidifier is powered on, and the humidifier outputs PID regulation.
According to the technical scheme, the electronic three-way reversing proportional valve can be replaced by an electronic hot gas bypass valve or a high-temperature electronic expansion valve.
According to the technical scheme, the condenser is an air-cooled condenser or a water-cooled condenser.
According to the technical scheme, the electric heater is any one of a stainless steel fin electric heater, a far infrared electric heater and a carbon fiber electric heating pipe.
According to the technical scheme, the circulating fan is an axial flow fan or a centrifugal fan.
According to the technical scheme, the humidifier is any one of an ultrasonic humidifier, a steam humidifier, a booster-type atomization humidifier and a centrifugal atomization humidifier.
According to the technical scheme, one side of the test box body is provided with the box door through the hinge, and the connecting part is fixedly provided with the sealing gasket.
Compared with the prior art, the invention has the following beneficial effects: the dynamic heat balance constant temperature and humidity control device utilizes a hot gas bypass technology, and the system realizes temperature control by adjusting the proportion of a high-temperature working medium and a low-temperature working medium flowing through an evaporator; the temperature in the box is forced to slowly rise by using the electric heater, the system controls the hot airflow to force the refrigerating system to increase the refrigerating capacity according to calculation so as to balance the heat output by electric heating, the air in the box is guided to the evaporator through the circulating fan while the constant temperature is realized, the humidity is reduced by condensing the moisture in the air, in order to maintain a stable relative humidity, the system needs to continuously supplement a certain humidifying capacity so as to balance the continuously reduced humidity, and when the relative humidity in the box reaches a set point, the electric heating output and the humidifying capacity are in a constant output state.
Drawings
The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this specification, illustrate embodiments of the invention and together with the description serve to explain the principles of the invention and not to limit the invention. In the drawings:
FIG. 1 is a schematic diagram of the overall system architecture of the present invention;
FIG. 2 is a schematic diagram of the control method of the present invention;
in fig. 1: 1. a compressor; 2. an electronic three-way reversing proportional valve; 3. a condenser; 4. a condensing fan; 5. an evaporation pressure regulating valve; 6. a differential pressure valve; 7. a reservoir; 8. a liquid supply solenoid valve; 9. an electric heater; 10. an evaporator; 11. a circulating fan; 12. a temperature sensor; 13. a humidity sensor; 14. a humidifier; 15. a gas-liquid separator; 16. a crankcase pressure regulating valve; 17. a controller; 18. a test box body;
in fig. 2: TPV, current temperature; TSV and setting temperature; HPV, current humidity; HSV and set humidity; A. continuously humidifying the upper limit value; B. the lower humidification limit is maintained.
Detailed Description
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 only a part of the embodiments of the present invention, and not all of the embodiments. 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, the present invention provides a technical solution: a dynamic heat balance constant temperature and humidity control device comprises a compressor 1, an electronic three-way reversing proportional valve 2, a condenser 3, a condensing fan 4, an evaporation pressure regulating valve 5, a pressure difference valve 6, a liquid storage device 7, a liquid supply electromagnetic valve 8, an electric heater 9, an evaporator 10, a circulating fan 11, a temperature sensor 12, a humidity sensor 13, a humidifier 14, a gas-liquid separator 15, a crankcase pressure regulating valve 16, a controller 17 and a test box 18, wherein one side of the test box 18 is provided with a box door through a hinge, the joints of the box door are fixedly provided with sealing gaskets, the electric heater 9, the evaporator 10, the circulating fan 11, the temperature sensor 12, the humidity sensor 13 and the humidifier 14 are sequentially arranged in the test box 18 from top to bottom, the output end of the evaporator 10 is sequentially connected with the gas-liquid separator 15, the crankcase pressure regulating valve 16, the compressor 1 and the electronic three-way reversing proportional valve 2 in a penetrating manner through pipelines, the output end of the electronic three-way reversing proportional valve 2 is connected with the input end of the evaporator 10, the electronic three-way reversing proportional valve 2 is connected with the condenser 3, the evaporating pressure regulating valve 5, the liquid storage device 7 and the liquid supply electromagnetic valve 8 in parallel, the condenser 3, the evaporating pressure regulating valve 5 and the differential pressure valve 6 are connected in parallel, one side of the condenser 3 is provided with the condensing fan 4, the controller 17 comprises a PLC (programmable logic controller) or a single chip microcomputer) and a driving plate, the input end of the controller 17 is electrically connected with the output ends of the temperature sensor 12 and the humidity sensor 13, and the output end of the controller 17 is electrically connected with the input ends of the compressor 1, the electronic three-way reversing proportional valve 2, the condenser 3, the condensing fan 4, the liquid supply electromagnetic valve 8, the electric heater 9, the evaporator 10, the circulating fan 11 and the humidifier 14.
A control method of a dynamic heat balance constant temperature and humidity control device comprises the following steps:
step one, calculating the output quantity of a hot gas bypass valve of a refrigerating unit according to the difference value PID of a set temperature TSV and a current temperature TPV;
step two, judging according to the difference value of the set relative humidity HSV and the current relative humidity HPV, assigning the controller to output the heating quantity and regulating the humidification quantity by PID;
step three, controlling heating:
1) loading:
firstly, when the output of the humidifier 14 is continuously less than or equal to A% A value, the value can be set, and the current humidity HPV-set humidity
When HSV is more than or equal to 1%, the heating power step value is + 1%;
secondly, after waiting for N seconds of the working step length of the electric heater 9, setting the value of N, returning to the step 1 of loading, and judging again by system software;
… … until the heating power is 100% output;
2) load shedding:
firstly, when the output of the humidifier 14 is continuously equal to or more than the B% B value, the value can be set, and the set humidity HSV-the current humidity
When the HPV is more than or equal to 1 percent, the heating power step value is-1 percent;
secondly, after waiting for N seconds of the working step length of the electric heater 9, the N value can be set, and then returning to the step 1 of load shedding for judging again;
… … until the heating power is 0% output;
step four, controlling humidification:
1) working when the temperature TSV is set to be between 10 and 40 ℃; when the temperature of TSV is less than 10 ℃ or the temperature of TSV is more than 40 ℃, the humidifier loses power;
2) when the set humidity HSV-the current humidity HPV is more than or equal to 1%, the humidifier 14 is powered on, and the output of the humidifier
And (4) PID regulation.
Wherein, the electronic three-way reversing proportional valve 2 can also be replaced by an electronic hot gas bypass valve or a high-temperature electronic expansion valve; the condenser 3 is an air-cooled condenser or a water-cooled condenser; the electric heater 9 is any one of a stainless steel fin electric heater, a far infrared electric heater and a carbon fiber electric heating pipe; the circulating fan 11 is an axial flow fan or a centrifugal fan; the humidifier 14 is any one of an ultrasonic humidifier, a steam humidifier, a pressurized atomizing humidifier, and a centrifugal atomizing humidifier.
Based on the above, the invention utilizes the hot gas bypass technology, and the system realizes the temperature control by adjusting the proportion of the high-temperature working medium and the low-temperature working medium flowing through the evaporator 10; the temperature in the test box 18 is forced to rise slowly by using the electric heater 9, the system controls the hot airflow to force the refrigerating system to increase the refrigerating capacity according to calculation so as to balance the heat output by electric heating, the air in the test box 18 is guided to the evaporator 10 through the circulating fan 11 while realizing constant temperature, the humidity is reduced by condensing the moisture in the air, in order to maintain a stable relative humidity, the system needs to continuously supplement a certain humidifying capacity so as to balance the continuously reduced humidity, and when the relative humidity in the test box 18 reaches a set point, the electric heating output quantity and the humidifying output quantity are in a constant output state.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Finally, it should be noted that: although the present invention has been described in detail with reference to the foregoing embodiments, it will be apparent to those skilled in the art that changes may be made in the embodiments and/or equivalents thereof without departing from the spirit and scope of the invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (7)
1. A control method of a dynamic heat balance constant temperature and humidity control device comprises a compressor (1), an electronic three-way reversing proportional valve (2), a condenser (3), a condensing fan (4), an evaporation pressure regulating valve (5), a differential pressure valve (6), a liquid storage device (7), a liquid supply electromagnetic valve (8), an electric heater (9), an evaporator (10), a circulating fan (11), a temperature sensor (12), a humidity sensor (13), a humidifier (14), a gas-liquid separator (15), a crankcase pressure regulating valve (16), a controller (17) and a test box body (18); an electric heater (9), an evaporator (10), a circulating fan (11), a temperature sensor (12), a humidity sensor (13) and a humidifier (14) are sequentially arranged in the test box body (18) from top to bottom, the output end of the evaporator (10) is sequentially connected with a gas-liquid separator (15), a crankcase pressure regulating valve (16), a compressor (1) and an electronic three-way reversing proportional valve (2) in series through pipelines, the output end of the electronic three-way reversing proportional valve (2) is connected with the input end of the evaporator (10), the electronic three-way reversing proportional valve (2) is connected with a condenser (3), an evaporation pressure regulating valve (5), a liquid storage device (7) and a liquid supply electromagnetic valve (8) in parallel, the condenser (3) and the evaporation pressure regulating valve (5) are connected with a differential pressure valve (6) in parallel, a condensing fan (4) is arranged on one side of the condenser (3), the controller (17) comprises a PLC or a single chip microcomputer and a driving board, the input end of the controller (17) is electrically connected with the output ends of the temperature sensor (12) and the humidity sensor (13), and the output end of the controller (17) is electrically connected with the input ends of the compressor (1), the electronic three-way reversing proportional valve (2), the condenser (3), the condensing fan (4), the liquid supply electromagnetic valve (8), the electric heater (9), the evaporator (10), the circulating fan (11) and the humidifier (14);
also comprises the following steps, which is characterized in that:
step one, calculating the output quantity of a hot gas bypass valve of a refrigerating unit according to the difference value PID of a set temperature TSV and a current temperature TPV;
step two, judging according to the difference value of the set relative humidity HSV and the current relative humidity HPV, assigning the controller to output the heating quantity and regulating the humidification quantity by PID;
step three, controlling heating:
1) loading:
firstly, when the output of the humidifier (14) is continuously less than or equal to A%, the value of A can be set, and the current humidity HPV-set humidity HSV is more than or equal to 1%, the heating power step value is + 1%;
after waiting for the working step length of the electric heater (9) for N seconds, setting the value of N, returning to the step 1 of loading, and judging again by system software;
… … until the heating power is 100% output;
2) load shedding:
firstly, when the output of the humidifier (14) is continuously more than or equal to B%, the B value can be set, and the set humidity HSV-the current humidity HPV is more than or equal to 1%, the heating power step value is-1%;
after waiting for the working step length of the electric heater (9) to be N seconds, setting the value of N, and returning to the step 1 of load shedding for judging again;
… … until the heating power is 0% output;
step four, controlling humidification:
1) working when the temperature TSV is set to be between 10 and 40 ℃; when the temperature of TSV is less than 10 ℃ or the temperature of TSV is more than 40 ℃, the humidifier loses power;
2) when the set humidity HSV-the current humidity HPV is more than or equal to 1%, the humidifier (14) is powered on, and the humidifier outputs PID regulation.
2. The control method of the dynamic heat balance constant temperature and humidity control device according to claim 1, characterized in that: the electronic three-way reversing proportional valve (2) can also be replaced by an electronic hot gas bypass valve or a high-temperature electronic expansion valve.
3. The control method of the dynamic heat balance constant temperature and humidity control device according to claim 1, characterized in that: the condenser (3) is an air-cooled condenser or a water-cooled condenser.
4. The control method of the dynamic heat balance constant temperature and humidity control device according to claim 1, characterized in that: the electric heater (9) is any one of a stainless steel fin electric heater, a far infrared electric heater and a carbon fiber electric heating tube.
5. The control method of the dynamic heat balance constant temperature and humidity control device according to claim 1, characterized in that: the circulating fan (11) is an axial flow fan or a centrifugal fan.
6. The control method of the dynamic heat balance constant temperature and humidity control device according to claim 1, characterized in that: the humidifier (14) is any one of an ultrasonic humidifier, a steam humidifier, a pressurized atomization humidifier and a centrifugal atomization humidifier.
7. The control method of the dynamic heat balance constant temperature and humidity control device according to claim 1, characterized in that: a box door is installed on one side of the test box body (18) through a hinge, and sealing gaskets are fixedly installed at the joints.
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