CN206960989U - A kind of constant temperature and humidity control device - Google Patents
A kind of constant temperature and humidity control device Download PDFInfo
- Publication number
- CN206960989U CN206960989U CN201720797531.7U CN201720797531U CN206960989U CN 206960989 U CN206960989 U CN 206960989U CN 201720797531 U CN201720797531 U CN 201720797531U CN 206960989 U CN206960989 U CN 206960989U
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- Prior art keywords
- humidity control
- electrically operated
- humidity
- operated valve
- control module
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Abstract
The utility model discloses a kind of constant temperature and humidity control device, system occurs including dry air, pressure loading valve, insulating box, air pump, humidity sensor, humidity control module, the first electrically operated valve and first gas flowmeter are sequentially provided between pressure loading valve and insulating box, the second electrically operated valve and second gas flowmeter are sequentially provided between air pump and insulating box, first electrically operated valve, first gas flowmeter, second electrically operated valve, second gas flowmeter is connected with humidity control module, humidity sensor is connected with insulating box, humidity sensor is by relative humidity data transfer to humidity control module.The utility model improves the control accuracy and control range of relative humidity under low temperature, and the calibrating for humiture under low temperature provides experiment condition.
Description
Technical field
The utility model is specifically related to a kind of constant temperature and humidity control device.
Background technology
Constant temperature and humidity control device has been widely used in the fields such as scientific research, metrology and measurement at present.Traditional constant temperature and humidity
Control device includes humidification device, dehydrating unit, and humidification device is typically real using heated humidifier and PCU Power Conditioning Unit
It is existing.But traditional constant temperature and humidity control device is complicated, and general work is all more than 10 DEG C, and minimum operating temperature is also only
Can be more than 0 DEG C, only a few temperature and humidity control device can reach -10 DEG C, and relative humidity occurrence scope is narrower, control accuracy
It is relatively low, it is impossible to meet the requirement of high-precision humiture experimental situation under low temperature.
Utility model content
In view of the above-mentioned problems, the utility model proposes a kind of constant temperature and humidity control device, can improve relatively wet under low temperature
The control accuracy and control range of degree, experiment condition is provided for the calibrating of humiture.
System, pressure loading valve, insulating box, air pump, humidity sensor occur for a kind of constant temperature and humidity control device, including dry air
Device, humidity control module, the first electrically operated valve and first gas stream are sequentially provided between the pressure loading valve and the insulating box
Gauge, the second electrically operated valve and second gas flowmeter, first electricity are sequentially provided between the air pump and the insulating box
Movable valve, the first gas flowmeter, second electrically operated valve, the second gas flowmeter with the humid control
Module is connected, and the humidity sensor is connected with the insulating box, and the humidity sensor is by relative humidity data transfer to institute
State humidity control module.
Further, system, which occurs, for the dry air includes air compressor, air accumulator, combination type drying machines, the sky
Air compressor is connected with air accumulator, and the air accumulator is connected with combination type drying machines.
Further, the gas flowmeter is connected by RS485 communication interfaces with the humidity control module.
Further, the humidity control module includes single-chip microcomputer and power supply circuit.
Further, the humidity control module is controlled using PID approach.
Further, the humidity sensor is connected by RS232 communication interfaces with the humidity control module.
The beneficial effects of the utility model：
1. the utility model, which is provided with dry air, occurs system, air produces dew-point temperature after dry air generation system
For -60 DEG C of dry air, while air pump is provided with, air pump directly extracts outdoor air to provide metastable Trace Water Vapor
Source, both are engaged so as to form a certain proportion of dry and wet air, reach the generation of humidity under low temperature.
2. the utility model employs two electrically operated valves (the first electrically operated valve and the second electrically operated valve) mutual cooperation, and
Dry air pressure is reduced using pressure loading valve, so as to improve the control to gas flow, improves the control essence of relative humidity
Degree.
3. the insulating box that the utility model uses works independently with humidity control system, to realize the perseverance of whole utility model
Temperature control system.
4. the utility model gas flowmeter is connected to humidity control module by RS485 communication interfaces, so as to improve
Message transmission rate, and RS485 communications interface transmissions distance is remote, anti-noise jamming is believed.
Brief description of the drawings
Fig. 1 is the structural representation of the utility model constant temperature and humidity control device.
Embodiment
In order that the purpose of this utility model, technical scheme and advantage are more clearly understood, with reference to embodiments, to this
Utility model is further elaborated.It should be appreciated that specific embodiment described herein is only explaining this practicality
It is new, it is not used to limit the utility model.
Application principle of the present utility model is explained in detail below in conjunction with the accompanying drawings.
As shown in figure 1, a kind of constant temperature and humidity control device, including dry air generation system 1, pressure loading valve 2, first are electronic
Valve 3, first gas flowmeter 4, insulating box 5, air pump 6, the second electrically operated valve 7, second gas flowmeter 8, humidity sensor
9th, humidity control module 10, the first electrically operated valve 3 and first gas flowmeter are sequentially provided between pressure loading valve 2 and insulating box 5
4, the second electrically operated valve 7 and second gas flowmeter 8, the first electrically operated valve 3, first are sequentially provided between air pump 6 and insulating box 5
Gas flowmeter 4, the second electrically operated valve 7, second gas flowmeter 8 are connected with humidity control module 10, humidity sensor 9 with
Insulating box 5 is connected, it is preferable that first gas flowmeter 4 and second gas flowmeter 8 are connected to by RS485 communication interfaces
Humidity control module 10, so as to improve message transmission rate, long transmission distance, anti-noise jamming is believed, humidity sensor 9 passes through
RS232 communication interfaces are connected to humidity control module 10.
In a kind of embodiment of the present utility model, dry air occur system 1 include air compressor 11, air accumulator 12,
Combination type drying machines 13, air compressor 11 are connected with air accumulator 12, air accumulator 12 and combination type drying machines 13.Air is through dry sky
The dry air that dew-point temperature is -60 DEG C is produced after gas generating system 1, because outlet pressure reaches 6 to 7 atmospheric pressure, so
Dry air is sent into insulating box 5 after pressure loading valve 2 is down to 1 to 2 atmospheric pressure by the first electrically operated valve 3, and the other end is then
Outdoor air is directly extracted by air pump 6 to be sent into insulating box 5 through the second electrically operated valve 7.Humidity control module 10 receives humidity
To the first electrically operated valve 3 and the second electrically operated valve 7 after the gas flow numerical value of 9 relative humidity numerical value and gas flow meter of sensor 4
Aperture be controlled, and using pressure loading valve 2 reduce dry air pressure.Humidity control module is wet by controlling air pump to extract
Air and dry air occur system and are sent into the AIR Proportional of insulating box to realize the humidity precision control function of low-temperature zone.
In a kind of embodiment of the present utility model, temperature control modules 10 include single-chip microcomputer and power supply circuit, single-chip microcomputer
For STM32F103RTC6, can be controlled using existing PID approach, the electrically operated valve 3 of humidity control module 10 and first,
Second electrically operated valve 7 the two electrically operated valves are engaged, so as to realize relative humidity control.
In order to realize the scope and control accuracy of relative humidity control under larger increase low temperature, the utility model provides one
Kind constant temperature and humidity control method, comprises the following steps：
(1) aperture of electrically operated valve, increase aperture Δ k are adjusted according to target gas flowi=ki-ki-1, (kiFor the i moment
Electrically operated valve aperture), detection gas changes in flow rate Δ ui=ui-ui-1, (uiFor the gas flow at i moment), determine gas
Flow aperture ratio pi=Δ ui/Δki(i=0, i.e., when adjusting first, Δ kiIt is manually set) so as to target gas as needed
Body flow ud, increase electronic valve opening Δ ki=(ud-ui)*pi, it is repeated in dynamic adjustment proportionality coefficient pi(it is more than p13 times
When take p1), until error ud-uiDuring less than 0.1L/min, reach gas flow control and require, into step (2).To prevent from falling into
Enter endless loop, automatically into step (2) when number of repetition is more than 5 times；
(2) relative humidity is adjusted according to gas flow, relative humidity deviation value in n-th of detection cycle insulating box：en=
Rd-Rn, wherein, RdFor the target relative humidity value of setting, RnFor rh value in n-th of detection cycle insulating box.Flow control
The sampling period of system is arranged to 1 second, and the PID sampling times of relative humidity, because thermostatic box lags very big, desirable 120-
300 seconds (being determined according to actual control situation), judges enScope, as | en| ＞ 10%, into step (3)；When 2%≤| en|
When≤10%, into step (4)；When | en| when≤2%, into step (5)；
(3) such as en＞ 10%, the second electrically operated valve flow of humid air is controlled to be adjusted to maximum, the first electrically operated valve closes
Close, now the first electrically operated valve is referred to as auxiliary adjustment electrically operated valve, returns step (2) and continues to judge；
Such as en＜ -10%, the first electrically operated valve flow of dry air is controlled to be adjusted to maximum, the second electrically operated valve is closed,
Now the second electrically operated valve is referred to as auxiliary adjustment electrically operated valve, returns step (2) and continues to judge；
(4) PD control, as flow export it is too small, then suitably open auxiliary adjustment electrically operated valve；
Such as 2%≤en≤ 10%, start differential control D, it is determined that the second required electrically operated valve flow output valve, returns to step
Suddenly (1), to reduce the climbing speed of relative humidity, with steadily close to desired value；
Such as -2%≤en≤ -10%, start differential control D, it is determined that the first required electrically operated valve flow output valve, is returned
Step (1), to reduce the fall off rate of relative humidity, with steadily close to desired value；
(5) PI is controlled, and keeps auxiliary electric valve opening constant, master control electrically operated valve corresponding to regulation, by having taken
The ratio between relative humidity variations amount of flow volume change values and output is obtained, calculating obtains ratio controlling value P, introduces integration control item I, takes
Larger time of integration Ti, to improve the stability of output, return step (2) and continue to judge.
In a kind of embodiment of the present utility model, the constant temperature and humidity control device, including dry air generation system 1,
Pressure loading valve 2, the first electrically operated valve 3, first gas flowmeter 4, insulating box 5, air pump 6, the second electrically operated valve 7, second gas
Flowmeter 8, humidity sensor 10, humidity control module 9；The first electrically operated valve is sequentially provided between pressure loading valve 2 and insulating box 5
3 and first gas flowmeter 4, the second electrically operated valve 7 and second gas flowmeter 8 are sequentially provided between air pump 6 and insulating box 5,
First electrically operated valve 3, first gas flowmeter 4, the second electrically operated valve 7, second gas flowmeter 8 with humidity control module 9
Be connected, humidity sensor 10 is connected with insulating box 5, humidity sensor 10 by relative humidity data transfer to humidity control module 9,
Humidity control module realizes accurate moisture control function under low temperature by using following control method, including：
(1) aperture of electrically operated valve, increase aperture Δ k are adjusted according to target gas flowi=ki-ki-1, (kiFor the i moment
Electrically operated valve aperture), detection gas changes in flow rate Δ ui=ui-ui-1, (uiFor the gas flow at i moment), determine gas
Flow aperture ratio pi=Δ ui/Δki(i=0, i.e., when adjusting first, Δ kiIt is manually set), so as to target gas as needed
Body flow ud, increase electronic valve opening Δ ki=(ud-ui)*pi, it is repeated in dynamic adjustment proportionality coefficient pi(it is more than p13 times
When take p1), until error ud-uiDuring less than 0.1L/min, reach gas flow control and require, into step (2)；
(2) relative humidity is adjusted according to gas flow, relative humidity deviation value in n-th of detection cycle insulating box：en=
Rd-Rn, wherein, RdFor the target relative humidity value of setting, RnFor rh value in n-th of detection cycle insulating box.Flow control
The sampling period of system is arranged to 1 second, and the PID sampling times of relative humidity, because thermostatic box lags very big, desirable 120-
300S (is determined) according to actual control situation, judges enScope, as | en| ＞ 10%, into step (3)；When 2%≤| en|≤
When 10%, into step (4)；When | en| when≤2%, into step (5)；
(3) such as en＞ 10%, the second electrically operated valve flow of humid air is controlled to be adjusted to maximum, the first electrically operated valve closes
Close, now the first electrically operated valve is referred to as auxiliary adjustment electrically operated valve, returns step (2) and continues to judge；
Such as en＜ -10%, the first electrically operated valve flow of dry air is controlled to be adjusted to maximum, the second electrically operated valve is closed,
Now the second electrically operated valve is referred to as auxiliary adjustment electrically operated valve, returns step (2) and continues to judge；
(4) PD control, as flow export it is too small, then suitably open auxiliary adjustment electrically operated valve；
Such as 2%≤en≤ 10%, start differential control D, it is determined that the second required electrically operated valve flow output valve, returns to step
Suddenly (1), to reduce the climbing speed of relative humidity, with steadily close to desired value；
Such as -2%≤en≤ -10%, start differential control D, it is determined that the first required electrically operated valve flow output valve, is returned
Step (1), to reduce the fall off rate of relative humidity, with steadily close to desired value；
(5) PI is controlled, and keeps auxiliary electric valve opening constant, master control electrically operated valve corresponding to regulation, by having taken
The ratio between relative humidity variations amount of flow volume change values and output is obtained, calculating obtains ratio controlling value P, introduces integration control item I, takes
Larger time of integration Ti, to improve the stability of output, return step (2) and continue to judge.
In summary：
1. the utility model, which is provided with dry air, occurs system, air produces dew-point temperature after dry air generation system
For -60 DEG C of dry air, while air pump is provided with, air pump directly extracts outdoor air to provide metastable Trace Water Vapor
Source, both are engaged so as to form a certain proportion of dry and wet air, reach the generation of humidity under low temperature.
2. the utility model employs two electrically operated valves (the first electrically operated valve and the second electrically operated valve) mutual cooperation, and
Dry air pressure is reduced using pressure loading valve, so as to improve the control to gas flow, improves relative humidity control accuracy.
3. the insulating box that the utility model uses works independently with humidity control system, to realize the perseverance of whole utility model
Temperature control system.
4. the utility model gas flowmeter is connected to humidity control module by RS485 communication interfaces, so as to improve
Message transmission rate, and RS485 communications interface transmissions distance is remote, anti-noise jamming is believed.
The advantages of general principle and principal character of the present utility model and the utility model has been shown and described above.One's own profession
The technical staff of industry is it should be appreciated that the utility model is not restricted to the described embodiments, described in above-described embodiment and specification
Simply illustrate principle of the present utility model, on the premise of the spirit and scope of the utility model is not departed from, the utility model is also
Various changes and modifications are had, these changes and improvements are both fallen within claimed the scope of the utility model.The utility model
Claimed scope is by appended claims and its equivalent thereof.
Claims (6)
- A kind of 1. constant temperature and humidity control device, it is characterised in that：System, pressure loading valve, insulating box, gas occurs including dry air Pump, humidity sensor, humidity control module, be sequentially provided between the pressure loading valve and the insulating box the first electrically operated valve and First gas flowmeter, the second electrically operated valve and second gas flowmeter are sequentially provided between the air pump and the insulating box, First electrically operated valve, the first gas flowmeter, second electrically operated valve, the second gas flowmeter are and institute State humidity control module to be connected, the humidity sensor is connected with the insulating box, and the humidity sensor is by relative humidity number Value is transferred to the humidity control module.
- A kind of 2. constant temperature and humidity control device according to claim 1, it is characterised in that：System bag occurs for the dry air Air compressor, air accumulator, combination type drying machines are included, the air compressor is connected with air accumulator, and the air accumulator is with combining Formula drying machine is connected.
- A kind of 3. constant temperature and humidity control device according to claim 1, it is characterised in that：The gas flowmeter passes through RS485 communication interfaces are connected with the humidity control module.
- A kind of 4. constant temperature and humidity control device according to claim 1, it is characterised in that：The humidity control module includes Single-chip microcomputer and power supply circuit.
- A kind of 5. constant temperature and humidity control device according to claim 4, it is characterised in that：The humidity control module uses PID approach is controlled.
- A kind of 6. constant temperature and humidity control device according to claim 1, it is characterised in that：The humidity sensor passes through RS232 communication interfaces are connected with the humidity control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720797531.7U CN206960989U (en) | 2017-07-04 | 2017-07-04 | A kind of constant temperature and humidity control device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720797531.7U CN206960989U (en) | 2017-07-04 | 2017-07-04 | A kind of constant temperature and humidity control device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206960989U true CN206960989U (en) | 2018-02-02 |
Family
ID=61383093
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720797531.7U Expired - Fee Related CN206960989U (en) | 2017-07-04 | 2017-07-04 | A kind of constant temperature and humidity control device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206960989U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121996A (en) * | 2017-07-04 | 2017-09-01 | 南京信息工程大学 | A kind of constant temperature and humidity control device and control method |
-
2017
- 2017-07-04 CN CN201720797531.7U patent/CN206960989U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107121996A (en) * | 2017-07-04 | 2017-09-01 | 南京信息工程大学 | A kind of constant temperature and humidity control device and control method |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20180202 Termination date: 20200704 |