CN103592974B - Temperature control method and system for automatic brazing of air conditioner heat exchanger - Google Patents
Temperature control method and system for automatic brazing of air conditioner heat exchanger Download PDFInfo
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- CN103592974B CN103592974B CN201310462328.0A CN201310462328A CN103592974B CN 103592974 B CN103592974 B CN 103592974B CN 201310462328 A CN201310462328 A CN 201310462328A CN 103592974 B CN103592974 B CN 103592974B
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- 238000005219 brazing Methods 0.000 title claims abstract description 31
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000004378 air conditioning Methods 0.000 claims abstract description 60
- 238000005476 soldering Methods 0.000 claims description 26
- 238000006243 chemical reaction Methods 0.000 claims description 18
- 230000033228 biological regulation Effects 0.000 claims description 10
- 239000007789 gas Substances 0.000 claims description 9
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- 239000002184 metal Substances 0.000 description 8
- 229910052751 metal Inorganic materials 0.000 description 8
- 238000010438 heat treatment Methods 0.000 description 5
- 238000003466 welding Methods 0.000 description 5
- 238000001816 cooling Methods 0.000 description 4
- 238000001764 infiltration Methods 0.000 description 4
- 230000008595 infiltration Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000003467 diminishing effect Effects 0.000 description 2
- 238000010304 firing Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 239000011148 porous material Substances 0.000 description 2
- 238000002791 soaking Methods 0.000 description 2
- 229910000679 solder Inorganic materials 0.000 description 2
- 239000007921 spray Substances 0.000 description 2
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 239000000567 combustion gas Substances 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000000465 moulding Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
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Abstract
The invention discloses a temperature control method for automatic brazing of an air conditioner heat exchanger, which comprises the following steps: collecting the temperature of the brazing part of the air-conditioning heat exchanger in real time; comparing and calculating the temperature deviation value between the temperature of the brazed part of the air-conditioning heat exchanger collected in real time and the standard temperature; judging whether the temperature deviation value is larger than a preset threshold value, if so, controlling the temperature by adopting a PFC (Power factor correction) control mode, and outputting a control quantity; otherwise, the PID control mode is adopted to control the temperature and output the control quantity. The invention also discloses a temperature control system for the automatic brazing of the air conditioner heat exchanger. The invention combines the PFC control mode and the PID control mode, improves the precision of temperature control, and thus improves the quality of the air-conditioning heat exchanger.
Description
Technical field
The present invention relates to air-conditioning heat exchanger automatic brazing technical field, more particularly, it relates to a kind of air-conditioning
The temperature-controlled process of heat exchanger automatic brazing and system.
Background technology
At present, along with the raising of people's living standard, on market, the demand to air-conditioning is growing.Air-conditioning
Enterprise strengthens yield one after another to meet needs, and will in the face of the fierce market competition, yield increase same
Time, quality is had higher requirement.Wherein, the heat exchanger of air-conditioning is that air-conditioning passes through heat exchange thus reality
The major part of existing temperature humidity regulation.Heat exchanger relies on copper pipe soldering to form sealed circuit, in welding
During if it occur that welding reveal, the use of air-conditioning will be had a strong impact on.
At present, the method that the soldering of air-conditioning heat exchanger is generally taked is: manual according to traditional artificial experience
The electromagnetic valve that regulation is relevant, it is achieved the control of gas flow, and then indirectly realize the control of brazing temperature.
It can thus be seen that the temperature-controlled process of existing air-conditioning heat exchanger soldering is affected relatively by artificial experience
Greatly, and during actual control, the pressure of combustion gas and combustion-supporting gas is in the state of fluctuation, therefore
Need frequently the flow of gas to be controlled, easily cause gas losses, and temperature control precision is low
Problem, and then have impact on the quality of air-conditioning heat exchanger.
Summary of the invention
In view of this, the present invention provides temperature-controlled process and the system of a kind of air-conditioning heat exchanger automatic brazing,
To realize improving the control accuracy of temperature in brazing process, thus improve the quality of air-conditioning heat exchanger.
For solving above-mentioned technical problem, the technical solution used in the present invention is: 1, a kind of air-conditioning heat exchanger is certainly
The temperature-controlled process of dynamic soldering, including:
Temperature at Real-time Collection air-conditioning heat exchanger soldering；
Relatively and calculate the temperature of temperature at the air-conditioning heat exchanger soldering of described Real-time Collection and standard temperature
Deviation value；
Judge that described temperature deviation value whether more than predetermined threshold value, the most then uses PFC control model pair
Temperature is controlled, and exports controlled quentity controlled variable；Otherwise, then use PID control model that temperature is controlled,
Output controlled quentity controlled variable.
Preferably, described predetermined threshold value is 20 DEG C.
Preferably, when described temperature deviation value is more than described predetermined threshold value, PFC control model pair is used
Temperature is controlled, output controlled quentity controlled variable particularly as follows:
Judge that temperature deviation value e (n) of current time with the product of temperature deviation value e (n-1) in a upper moment was
No it is less than zero, the most then controls scale parameter Kp and Kd by regulation, make controlled quentity controlled variable and flame temperature
Meet temperature regression equation；Otherwise, then:
Positive and negative according to temperature deviation value e (n), reversely regulation controls scale parameter Kp and Kd, makes control
Amount and flame temperature meet temperature regression equation.
Preferably, described temperature regression equation is: T=0.8X2-72.8X+2233.7;
Wherein: X is the ratio of the oxygen supply with liquefied gas, i.e. controlled quentity controlled variable；T is flame temperature.
A kind of temperature control system of air-conditioning heat exchanger automatic brazing, including: temperature sensor, transmitter,
A/D change-over circuit, comparator, mode selector, PID controller, pfc controller, D/A change electricity
Road, actuator and air-conditioning heat exchanger；Wherein:
Described temperature sensor is connected with described air-conditioning heat exchanger, air-conditioning heat exchanger soldering described in Real-time Collection
The temperature at place, and the temperature of collection is sent to the described transmitter being connected with described temperature sensor；
After the described temperature received is changed by described transmitter, the temperature after conversion is sent
To the described A/D change-over circuit being connected with described transmitter；
Described A/D change-over circuit receives described temperature after conversion, and the described temperature that will receive
After carrying out A/D conversion, send to the described comparator being connected with described A/D change-over circuit；
The described temperature received is compared by described comparator with standard temperature, calculates temperature deviation value,
And the described temperature deviation value calculated is sent to the described mode selection being connected with described comparator
Device；
Described mode selector judge described temperature deviation value whether more than preset value, the most then trigger with
Described mode selector connect described pfc controller use PFC control model output controlled quentity controlled variable to institute
State the described D/A change-over circuit that pfc controller connects；Otherwise, then trigger with described mode selector even
The described PID controller connect uses PID control model output controlled quentity controlled variable to being connected with described PID controller
Described D/A change-over circuit；
Described D/A change-over circuit will receive after described controlled quentity controlled variable carries out D/A conversion and export to described
The described actuator that D/A change-over circuit connects；
Described actuator according to the described controlled quentity controlled variable received to the temperature at described air-conditioning heat exchanger soldering
It is controlled.
Preferably, described predetermined threshold value is 20 DEG C.
From above-mentioned technical scheme it can be seen that a kind of air-conditioning heat exchanger automatic brazing disclosed by the invention
Temperature-controlled process, by the temperature at Real-time Collection air-conditioning heat exchanger soldering, and by the sky of Real-time Collection
The temperature at heat exchanger soldering is adjusted to compare with standard temperature, output temperature deviation value, work as temperature deviation
When value is more than preset value, use PFC control model that temperature is controlled, when temperature deviation value is less than pre-
If during value, use PID control model that temperature is controlled.When deviation value is more than preset value, pass through
Use PFC control model can accelerate response efficiency, when deviation value is less than preset value, by using PID
Control model can control static difference value and improve reconciliation precision.It can thus be seen that the present invention is by PFC control
Pattern and PID control model combine, it is possible to increase temperature controlled precision such that it is able to improve air-conditioning
The quality of heat exchanger.
Accompanying drawing explanation
In order to be illustrated more clearly that the embodiment of the present invention or technical scheme of the prior art, below will be to reality
Execute the required accompanying drawing used in example or description of the prior art to be briefly described, it should be apparent that below,
Accompanying drawing in description is only some embodiments of the present invention, for those of ordinary skill in the art,
On the premise of not paying creative work, it is also possible to obtain other accompanying drawing according to these accompanying drawings.
Fig. 1 is the temperature-controlled process of a kind of air-conditioning heat exchanger automatic brazing disclosed in the embodiment of the present invention
Flow chart；
Fig. 2 is the temperature control system of a kind of air-conditioning heat exchanger automatic brazing disclosed in the embodiment of the present invention
Structural representation；
Fig. 3 is heat exchanger automatic brazing temperature control curve disclosed by the invention.
Detailed description of the invention
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is carried out
Clearly and completely describe, it is clear that described embodiment is only a part of embodiment of the present invention,
Rather than whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art are not having
Make the every other embodiment obtained under creative work premise, broadly fall into the scope of protection of the invention.
The embodiment of the invention discloses temperature-controlled process and the system of a kind of air-conditioning heat exchanger automatic brazing,
To realize improving the control accuracy of temperature in brazing process, thus improve the quality of air-conditioning heat exchanger.
As it is shown in figure 1, the temperature-controlled process of a kind of air-conditioning heat exchanger automatic brazing, including:
Temperature at S101, Real-time Collection air-conditioning heat exchanger soldering；
S102, relatively and calculate the temperature at the air-conditioning Welding of Heat-exchanger of described Real-time Collection and standard temperature
Temperature deviation value；
S103, judge that described temperature deviation value whether more than predetermined threshold value, the most then enters step S104:
Temperature is controlled by S104, employing PFC control model, exports controlled quentity controlled variable；Otherwise, then enter
Step S105:
S105: use PID control model that temperature is controlled, export controlled quentity controlled variable.
Concrete, described predetermined threshold value is 20 DEG C.
Concrete, step S104 particularly as follows:
Judge that temperature deviation value e (n) of current time with the product of temperature deviation value e (n-1) in a upper moment was
No it is less than zero, the most then controls scale parameter Kp and Kd by regulation, make controlled quentity controlled variable and flame temperature
Meet temperature regression equation；Otherwise, then:
Positive and negative according to temperature deviation value e (n), reversely regulation controls scale parameter Kp and Kd, makes control
Amount and flame temperature meet temperature regression equation.
Concrete, described temperature regression equation is: T=0.8X2-72.8X+2233.7;
Wherein: X is the ratio of the oxygen supply with liquefied gas, i.e. controlled quentity controlled variable；T is flame temperature.
Below in conjunction with Fig. 1 and Fig. 3, the operation principle of above-described embodiment is described in detail.
As it is shown on figure 3, be the automatic brazing temperature control curve of air-conditioning heat exchanger disclosed by the invention.As
Shown in Fig. 3, the beginning temperature of soldering is that room temperature (Room temperature) actual temp value is the strictest
Control, and require, with speed faster, workpiece brazing area temperature to be increased to 350 ± 50 DEG C of temperature models
Enclose；Now need suitably to control firing rate, to ensure temperature homogeneous heating, it is to avoid bigger thermograde,
I.e. prevent the bigger temperature difference of workpiece diverse location, be slowly heated within 15 ± 5 second time so that workpiece welds
Connect district's temperature and be increased to 500 ± 50 DEG C.Can relatively rapid heat afterwards, but to control to be heated to 720 ±
10 DEG C of temperature spots, with the time of up to 800 ± 10 DEG C of temperature ranges, the longest must not exceed 5 seconds, otherwise can
Occur overheated causing mother metal burning embrittlement i.e. mother metal mechanical properties decrease, solder corrode mother metal i.e. to make mother metal
The abnormal conditions such as effective thickness is thinning.Carrying out workpiece cooling section afterwards, time period notices that rate of cooling is not
Can be too fast, otherwise can produce soldering pore cannot effectively escape, the situation such as bigger welding stress, control
Be characterized by guarantee from 720 ± 10 DEG C to 800 ± 10 DEG C temperature ranges be cooled to 350 ± 50 DEG C of temperature spots time
Between more than 8 seconds, as equipment cannot ensure this time, special attemperator can be increased but need control
Temperature is 720 ± 10 DEG C to 350 ± 50 DEG C temperature ranges, and this temperature range is that effective holding temperature is interval.
It it is more than the temperature control song of desired " preheating ", " heating ", " infiltration ", " insulation "
The most how line, reach the temperature control of each section, and the temperature by bringing-up section illustrates as a example by controlling below.
In the bringing-up section to air-conditioning heat exchanger automatic brazing, it is desirable to optimum temperature be 745 DEG C, i.e. bringing-up section
Required standard temperature is 745 DEG C.During heating air-conditioning heat exchanger automatic brazing, real-time adopts
Temperature at collection air-conditioning heat exchanger soldering, i.e. the temperature of flame at Spray gun nozzle.By the temperature of Real-time Collection with
Standard temperature compares, and calculates temperature deviation value e (n).If within a cycle, temperature deviation value
E (n) is less than or equal to 20 DEG C, then use PID control model to be controlled temperature, and enter the next one
The Time-sharing control cycle.If in next cycle, temperature deviation value e (n) still less than or equal to 20 DEG C,
Then continue to PID control model, and enter the next Time-sharing control cycle.If at next cycle
In, temperature deviation value e (n) is more than 20 DEG C, then use PFC control model to be controlled temperature.Use
When temperature is controlled by PFC control model, first determine whether temperature deviation value e (n) and upper of current time
The product of temperature deviation value e (n-1) in moment whether less than zero, the most then proves that temperature trend is becoming
Change, i.e. prove that temperature deviation is diminishing, the most only need to regulate control scale parameter Kp and Kd, make control
Amount and flame temperature meet temperature regression equation, and enter the next Time-sharing control cycle.Wherein: temperature
Regression equation is: T=0.8X2-72.8X+2233.7, wherein: X is the supply of oxygen and liquefied gas
Ratio, i.e. controlled quentity controlled variable；T is flame temperature.If in next cycle, temperature deviation value e (n) is the biggest
In 20 DEG C, then continue to use PFC control model that temperature is controlled.Use PFC control model to temperature
When degree is controlled, first determined whether temperature deviation e (n) of current time and the temperature deviation value in a upper moment
The product of e (n-1), whether less than zero, if it is not, then prove that temperature trend does not changes, i.e. proves that temperature is inclined
Difference is becoming big, now positive and negative according to temperature deviation value e (n), reversely regulation control scale parameter Kp and
Kd, makes controlled quentity controlled variable and flame temperature meet temperature regression equation.
The control mode of the preheating section of air-conditioning heat exchanger automatic brazing, infiltration section and soaking zone and bringing-up section
Control mode principle is identical, does not repeats them here.
As in figure 2 it is shown, the temperature control of a kind of air-conditioning heat exchanger automatic brazing disclosed in the embodiment of the present invention
System processed, including: temperature sensor 201, transmitter 202, A/D change-over circuit 203, comparator 204,
Mode selector 205, PID controller 206, pfc controller 207, D/A change-over circuit 208, execution
Mechanism 209 and air-conditioning heat exchanger 210；Wherein:
Temperature sensor 201 is connected with air-conditioning heat exchanger 210, Real-time Collection air-conditioning heat exchanger 210 soldering
The temperature at place, and the temperature of collection is sent to the transmitter 202 being connected with temperature sensor 201；
After the described temperature received is changed by transmitter 202, the temperature after conversion is sent
To the A/D change-over circuit 203 being connected with transmitter 202；
A/D change-over circuit 203 receives described temperature after conversion, and the described temperature that will receive
After carrying out A/D conversion, send to the comparator 204 being connected with A/D change-over circuit 203；
The described temperature received is compared by comparator 204 with standard temperature, calculates temperature deviation value,
And the described temperature deviation value calculated is sent to the mode selector 205 being connected with comparator 204；
Mode selector 205 judges that described temperature deviation value whether more than predetermined threshold value, the most then triggers
The pfc controller 207 being connected with mode selector 205 use PFC control model output controlled quentity controlled variable to
The described D/A change-over circuit 208 that pfc controller 207 connects；Otherwise, then trigger and mode selector
205 connect PID controller 206 use PID control model output controlled quentity controlled variable to PID controller 206
The D/A change-over circuit 208 connected；
D/A change-over circuit 208 will receive output after described controlled quentity controlled variable carries out D/A conversion and extremely turn with D/A
Change the actuator 209 that circuit 208 connects；
Actuator 209 according to the described controlled quentity controlled variable received to the temperature at air-conditioning heat exchanger 210 soldering
It is controlled.
Concrete, described predetermined threshold value is 20 DEG C.
Below in conjunction with Fig. 2 and Fig. 3, the operation principle of above-described embodiment is described in detail.
As it is shown on figure 3, be the automatic brazing temperature control curve of air-conditioning heat exchanger disclosed by the invention.As
Shown in Fig. 3, the beginning temperature of soldering is that room temperature (Room temperature) actual temp value is the strictest
Control, and require, with speed faster, workpiece brazing area temperature to be increased to 350 ± 50 DEG C of temperature models
Enclose；Now need suitably to control firing rate, to ensure temperature homogeneous heating, it is to avoid bigger thermograde,
I.e. prevent the bigger temperature difference of workpiece diverse location, be slowly heated within 15 ± 5 second time so that workpiece welds
Connect district's temperature and be increased to 500 ± 50 DEG C.Can relatively rapid heat afterwards, but to control to be heated to 720 ±
10 DEG C of temperature spots, with the time of up to 800 ± 10 DEG C of temperature ranges, the longest must not exceed 5 seconds, otherwise can
Occur overheated causing mother metal burning embrittlement i.e. mother metal mechanical properties decrease, solder corrode mother metal i.e. to make mother metal
The abnormal conditions such as effective thickness is thinning.Carrying out workpiece cooling section afterwards, time period notices that rate of cooling is not
Can be too fast, otherwise can produce soldering pore cannot effectively escape, the situation such as bigger welding stress, control
Be characterized by guarantee from 720 ± 10 DEG C to 800 ± 10 DEG C temperature ranges be cooled to 350 ± 50 DEG C of temperature spots time
Between more than 8 seconds, as equipment cannot ensure this time, special attemperator can be increased but need control
Temperature is 720 ± 10 DEG C to 350 ± 50 DEG C temperature ranges, and this temperature range is that effective holding temperature is interval.
It it is more than the temperature control song of desired " preheating ", " heating ", " infiltration ", " insulation "
The most how line, reach the temperature control of each section, and the temperature by bringing-up section illustrates as a example by controlling below.
In the bringing-up section to air-conditioning heat exchanger automatic brazing, it is desirable to optimum temperature be 745 DEG C, i.e. bringing-up section
Required standard temperature is 745 DEG C.During air-conditioning heat exchanger automatic brazing is heated, pass through temperature
What sensor 201 was real-time gathers the temperature at air-conditioning heat exchanger 210 soldering, the i.e. temperature of flame at Spray gun nozzle
Degree.The temperature gathered sends to transmitter 202 by temperature sensor 201, and transmitter 202 will receive
Described temperature is changed, and sends the temperature after conversion to A/D change-over circuit 203, A/D
After the temperature after conversion received is carried out A/D conversion by change-over circuit 203, send extremely and A/D
The comparator 204 that change-over circuit 203 connects, comparator 204 is by the described temperature received and standard temperature
Compare, calculate temperature deviation value e (n), and described temperature deviation value e (n) calculated is sent
To mode selector 205.The temperature deviation value received is compared by mode selector 205 with predetermined threshold value
Relatively, if within a cycle, temperature deviation value e (n) is less than or equal to 20 DEG C, i.e. temperature deviation value e (n)
Less than or equal to preset value, then mode selector 205 triggers PID controller 206 and uses PID control mould
Temperature is controlled by formula, output controlled quentity controlled variable to D/A change-over circuit 208, and D/A change-over circuit 208 will
The described controlled quentity controlled variable received exports after carrying out D/A conversion to actuator 209, actuator 209
According to the described controlled quentity controlled variable received, the temperature at air-conditioning heat exchanger 210 soldering is controlled, simultaneously enters
The next Time-sharing control cycle.If in next cycle, temperature deviation value e (n) still less than or be equal to
20 DEG C, then continue to PID control model, and enter the next Time-sharing control cycle.If at next
In the individual cycle, temperature deviation value e (n) is more than 20 DEG C, then mode selector 205 triggers pfc controller 207
Use PFC control model that temperature is controlled, when using PFC control model that temperature is controlled,
First determine whether that temperature deviation value e (n) of current time with the product of temperature deviation value e (n-1) in a upper moment was
No it is less than zero, the most then proves that temperature trend is changing, i.e. prove that temperature deviation is diminishing, this
Time only need to regulate control scale parameter Kp and Kd, make controlled quentity controlled variable and flame temperature meet temperature regression equation,
Output controlled quentity controlled variable is to D/A change-over circuit 208, the described controlled quentity controlled variable that D/A change-over circuit 208 will receive
Exporting after carrying out D/A conversion to actuator 209, actuator 209 is according to the described control received
Temperature at air-conditioning heat exchanger 210 soldering is controlled by amount, and enters the next Time-sharing control cycle.
Wherein: temperature regression equation is: T=0.8X2-72.8X+2233.7, wherein: X is oxygen and liquefaction
The ratio of the supply of gas, i.e. controlled quentity controlled variable；T is flame temperature.If in next cycle, temperature deviation
Value e (n) still greater than 20 DEG C, then continues to use PFC control model to be controlled temperature.Use PFC control
When temperature is controlled by molding formula, first determined whether temperature deviation e (n) of current time and the temperature in a upper moment
Whether the product spending inclined difference e (n-1) is less than zero, if it is not, then prove that temperature trend does not changes, and i.e. demonstrate,proves
Bright temperature deviation is becoming big, now positive and negative according to temperature deviation value e (n), and reversely regulation controls scale parameter
Kp and Kd, makes controlled quentity controlled variable and flame temperature meet temperature regression equation, and output controlled quentity controlled variable is changed to D/A
Circuit 208, D/A change-over circuit 208 export after the described controlled quentity controlled variable received is carried out D/A conversion to
Actuator 209, actuator 209 according to the described controlled quentity controlled variable received to air-conditioning heat exchanger 210 soldering
The temperature at place is controlled.
The control mode of the preheating section of air-conditioning heat exchanger automatic brazing, infiltration section and soaking zone and bringing-up section
Control mode principle is identical, does not repeats them here.
In this specification, each embodiment uses the mode gone forward one by one to describe, and each embodiment stresses
Being the difference with other embodiments, between each embodiment, identical similar portion sees mutually.
Described above to the disclosed embodiments, makes professional and technical personnel in the field be capable of or uses
The present invention.Multiple amendment to these embodiments will be aobvious and easy for those skilled in the art
See, generic principles defined herein can without departing from the spirit or scope of the present invention,
Realize in other embodiments.Therefore, the present invention is not intended to be limited to the embodiments shown herein,
And it is to fit to the widest scope consistent with principles disclosed herein and features of novelty.
Claims (6)
1. the temperature-controlled process of an air-conditioning heat exchanger automatic brazing, it is characterised in that described temperature control
Method processed is applied to temperature controlled every section, including:
Temperature at Real-time Collection air-conditioning heat exchanger soldering；
Relatively and calculate temperature at the air-conditioning heat exchanger soldering of described Real-time Collection and this section of required standard
The temperature deviation value of temperature；
Within a cycle, it is judged that whether described temperature deviation value more than predetermined threshold value, the most then uses
Temperature is controlled by PFC control model, exports controlled quentity controlled variable；Otherwise, then PID control model pair is used
Temperature is controlled, and exports controlled quentity controlled variable.
Method the most according to claim 1, it is characterised in that described predetermined threshold value is 20 DEG C.
Method the most according to claim 2, it is characterised in that when described temperature deviation value is more than institute
When stating predetermined threshold value, use PFC control model temperature is controlled, output controlled quentity controlled variable particularly as follows:
Judge that temperature deviation value e (n) of current time with the product of temperature deviation value e (n-1) in a upper moment was
No it is less than zero, the most then controls scale parameter Kp and Kd by regulation, make controlled quentity controlled variable and flame temperature
Meet temperature regression equation；Otherwise, then:
Positive and negative according to temperature deviation value e (n), reversely regulation controls scale parameter Kp and Kd, makes control
Amount and flame temperature meet temperature regression equation.
Method the most according to claim 3, it is characterised in that described temperature regression equation is:
T=0.8X2-72.8X+2233.7；
Wherein: X is the ratio of the oxygen supply with liquefied gas, i.e. controlled quentity controlled variable；T is flame temperature.
5. the temperature control system of an air-conditioning heat exchanger automatic brazing, it is characterised in that be applied to temperature
Every section controlled, including: temperature sensor, transmitter, A/D change-over circuit, comparator, mode choosing
Select device, PID controller, pfc controller, D/A change-over circuit, actuator and air-conditioning heat exchanger；Its
In:
Described temperature sensor is connected with described air-conditioning heat exchanger, air-conditioning heat exchanger soldering described in Real-time Collection
The temperature at place, and the temperature of collection is sent to the described transmitter being connected with described temperature sensor；
After the described temperature received is changed by described transmitter, the temperature after conversion is sent
To the described A/D change-over circuit being connected with described transmitter；
Described A/D change-over circuit receives described temperature after conversion, and the described temperature that will receive
After carrying out A/D conversion, send to the described comparator being connected with described A/D change-over circuit；
Standard temperature required with this section for the described temperature received is compared by described comparator, calculates
Temperature deviation value, and the described temperature deviation value calculated is sent to the institute being connected with described comparator
State mode selector；
Within a cycle, described mode selector judges whether described temperature deviation value is more than predetermined threshold value,
The most then triggering the described pfc controller being connected with described mode selector uses PFC control model defeated
Go out controlled quentity controlled variable to the described D/A change-over circuit being connected with described pfc controller；Otherwise, then trigger and institute
The described PID controller stating the connection of mode selector uses PID control model output controlled quentity controlled variable to described
The described D/A change-over circuit that PID controller connects；
Described D/A change-over circuit will receive after described controlled quentity controlled variable carries out D/A conversion and export to described
The described actuator that D/A change-over circuit connects；
Described actuator according to the described controlled quentity controlled variable received to the temperature at described air-conditioning heat exchanger soldering
It is controlled.
System the most according to claim 5, it is characterised in that described predetermined threshold value is 20 DEG C.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN201310462328.0A CN103592974B (en) | 2013-09-30 | 2013-09-30 | Temperature control method and system for automatic brazing of air conditioner heat exchanger |
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|---|---|---|---|
| CN201310462328.0A CN103592974B (en) | 2013-09-30 | 2013-09-30 | Temperature control method and system for automatic brazing of air conditioner heat exchanger |
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| CN103592974B true CN103592974B (en) | 2016-08-24 |
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| CN109588782A (en) * | 2018-12-18 | 2019-04-09 | 绿烟实业（深圳）有限公司 | Temperature control equipment, temprature control method and the non-burning smoking set of heating |
| CN110262592A (en) * | 2019-06-27 | 2019-09-20 | 中国铁建重工集团股份有限公司 | Elastic strip heating method, system and equipment and computer readable storage medium |
| CN114589426A (en) * | 2022-04-21 | 2022-06-07 | 珠海格力电器股份有限公司 | Welding method of two air conditioners |
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| US4344565A (en) * | 1979-08-01 | 1982-08-17 | Nippondenso Co., Ltd. | Control method and apparatus for air conditioners |
| US4345714A (en) * | 1979-08-01 | 1982-08-24 | Nippondenso Co., Ltd. | Control method and apparatus for air conditioners |
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| US4344565A (en) * | 1979-08-01 | 1982-08-17 | Nippondenso Co., Ltd. | Control method and apparatus for air conditioners |
| US4345714A (en) * | 1979-08-01 | 1982-08-24 | Nippondenso Co., Ltd. | Control method and apparatus for air conditioners |
| CN1926393A (en) * | 2004-03-04 | 2007-03-07 | 开利公司 | Non-linear control algorithm in vapor compression systems |
| CN101389953A (en) * | 2006-02-28 | 2009-03-18 | 丰田自动车株式会社 | Temperature control apparatus for heater-equipped sensor |
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| 真空钎焊温度的建模与解耦控制;李晓斌等;《真空科学与技术学报》;20090430;第29卷(第2期);第150-154页 * |
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| CN103592974A (en) | 2014-02-19 |
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