CN104296386B - Control method, control system and the gas heater of gas heater - Google Patents
Control method, control system and the gas heater of gas heater Download PDFInfo
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- CN104296386B CN104296386B CN201310301582.2A CN201310301582A CN104296386B CN 104296386 B CN104296386 B CN 104296386B CN 201310301582 A CN201310301582 A CN 201310301582A CN 104296386 B CN104296386 B CN 104296386B
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Abstract
The invention discloses a kind of control method of gas heater, control system and gas heaters.The control method includes the following steps: during water heater working, monitors water heater current gas ratio valve opening, calculates currently practical calory burning；Judge whether the current gas ratio valve opening and the currently practical calory burning meet preset standard functional relation；When the current gas ratio valve opening and the currently practical calory burning do not meet the preset standard functional relation, determine that gaseous-pressure is insufficient, low voltage control process is executed according to current low pressure maximum heating load；When the current gas ratio valve opening and the currently practical calory burning meet the preset standard functional relation, normal control process is executed.Using the gas heater of method and system of the invention, be able to solve stop working because of gaseous-pressure deficiency, the problem of jump fire and leaving water temperature are unable to reach set temperature.
Description
Technical field
The invention belongs to fluid technical field of heating, specifically, being the control method for being related to gas heater, control system
System and gas heater.
Background technique
The control system of existing blowing type gas water heater includes controller, blower, gas ratio valve, igniter, water outlet
Temperature sensor, inflow temperature sensor and water flow monitor sensor, the output end and blower of controller, gas ratio valve with
And the input terminal electrical connection of igniter, the input terminal and leaving water temperature sensors, inflow temperature sensor and water flow of controller
The output end electrical connection of sensor is monitored, the burner in igniter control water heater enters combustion state, blower and combustion gas ratio
Air and combustion gas are sent into burner are mixed and burned respectively by example valve, and burner is by the heat transfer of generation to changing in water heater
Hot device, cold water becomes hot water after heat exchanger carries out heat exchange, to export hot water.
Currently, blowing type gas water heater is to realize constant-temperature effluent, usually first calculates and reach setting leaving water temperature institute
The calory burning needed, is then opened according to the functional relation between calory burning and the aperture of gas ratio valve to control proportioning valve
Degree, it is final to realize effluent temperature constancy in setting leaving water temperature.During controlling gas proportion valve opening, gas quantity and wind
The air quantity that machine is sent into needs according to a certain percentage to match, to guarantee that combustion gas work in optimal combustion operating condition, improves combustion gas
Utilization rate.Since present combustion gas generallys use central gas supply, benefit from compression ring border and pipe technology and restrict, combustion gas barometric fluctuation compared with
Greatly, especially in user peak period, combustion gas air pressure is lower.In the insufficient situation of combustion gas air pressure, although increasing gas proportion
The aperture of valve, but practical gas quantity does not increase, but fan delivery still will increase, and reaches a certain level in fan delivery
When, flame will be blown out or jump fire, influences user's normal use.
For this purpose, existing Some gases water heater has air pressure monitoring device, the combustion gas in pipeline is monitored, in combustion gas
Alarm is issued when hypotony, and is shut down and stopped working.But it is still unable to satisfy demand of the user to hot water after shutdown,
And increase the cost that air pressure monitoring device also adds water heater.
The Chinese patent of Publication No. CN101839552A discloses a kind of blowing type gas water heater constant temperature control method
And its control system, in disclosed control method, when gas heater is for unsaturated vapor, current thermic load is calculated, so
Air blower air-supply is controlled according to the corresponding relationship of current thermic load and the blow rate required afterwards, is guaranteed fiery in the insufficient situation of gaseous-pressure
Flame is not blown out.But if current thermic load is higher, supply gas pressure is extremely low, and flame is it is possible to be blown out.Moreover, even if
Flame is not blown out, in regulating gas proportional valve control leaving water temperature, it is possible to still in the case where adjusting to maximum opening
Current thermic load cannot be reached, so that leaving water temperature is unable to reach set temperature, influence use of the user to hot water.
Summary of the invention
An object of the present invention is to provide a kind of control method of gas heater, to solve the heat of combustion gas in the prior art
The problem of hydrophone stops working because of gaseous-pressure deficiency, jump fire and leaving water temperature are unable to reach set temperature.
In order to solve the above technical problems, control method provided by the invention is adopted the following technical solutions and is achieved:
A kind of control method of gas heater, the method includes the following steps:
A, during water heater working, monitoring water heater current gas ratio valve opening, currently goes out current inflow temperature
Coolant-temperature gage and current water flow are calculated according to the current inflow temperature, the current leaving water temperature and the current water flow
Currently practical calory burning；
B, judge whether the current gas ratio valve opening and the currently practical calory burning meet preset standard letter
Number relationship selects to execute step c or step d according to judging result；
C, the preset standard letter is not met in the current gas ratio valve opening and the currently practical calory burning
When number relationship, determines that gaseous-pressure is insufficient, determine current low pressure maximum heating load, and according to current low pressure maximum heating load, institute
It states current inflow temperature and currently the setting leaving water temperature adjusting current water flow, then will be described current to required water flow
Low pressure maximum heating load is as current maximum combustion heat, according to current maximum combustion heat and the preset standard functional relation
Regulating gas ratio valve opening and fan delivery control water heater with the current setting leaving water temperature constant-temperature effluent；
D, meet the preset standard function in the current gas ratio valve opening and the currently practical calory burning
When relationship, determine that gaseous-pressure is sufficient, execute normal control process, water heater is controlled with described according to current desired calory burning
Current setting leaving water temperature constant-temperature effluent；
Wherein, the current low pressure maximum heating load is the currently practical combustion curve of water heater and the default intersection point for determining line
Corresponding thermic load.
Control method as described above, for avoid because gaseous-pressure is disturbed, of short duration generation insufficient pressure due to frequent progress
Judgement and control conversion, in the step c, the current gas ratio valve opening and the currently practical calory burning not
When meeting the preset standard functional relation, it is maximum first to judge whether the currently practical calory burning is less than the current low pressure
Thermic load, it is maximum further according to the low pressure when the currently practical calory burning is less than the current low pressure maximum heating load
Current water flow described in heat load adjustment.
Control method as described above, the normal control process include the following steps:
D1, calculated according to the current inflow temperature, the current water flow and current setting leaving water temperature it is current desired
Calory burning；
D2, according to current desired calory burning and the preset standard functional relation regulating gas ratio valve opening and blower
Air quantity controls water heater with the current setting leaving water temperature constant-temperature effluent.
Control method as described above, to improve precise control, after setting time reaches or water heater restarts,
It is intended to execute the process of the step a to d.
Control method as described above, the water flow is the flow of inlet water of water heater, in the inlet pipeline of water heater
It is provided with water servomechanism, controls the water servomechanism to adjust the flow of inlet water.
The second object of the present invention is to provide a kind of control system of gas heater, using the system it is possible to prevente effectively from
Because gas heater stops working because of gaseous-pressure deficiency, jump fire and leaving water temperature are unable to reach set temperature the problem of.
For achieving the above object, control system provided by the invention adopts the following technical solutions to realize:
A kind of control system of gas heater, including be arranged on heater inleting pipe road inflow temperature sensor,
Leaving water temperature sensors, the water flow monitoring sensor of monitoring water flow of water heater amount, control combustion gas on outlet pipeline are set
Gas ratio valve, control air inlet amount blower and controller, which is characterized in that the system also includes with the control
Device is connected, the water flow for adjusting water flow of water heater amount adjusts unit, and the controller includes:
Currently practical calory burning computing unit works as advancing water temperature for what is monitored according to the inflow temperature sensor
The current water that the current leaving water temperature and water flow monitoring sensor that degree, the leaving water temperature sensors are monitored are monitored
Flow calculates currently practical calory burning；
Gaseous-pressure judging unit is connected with the currently practical calory burning computing unit, for judging described work as
Whether the aperture of preceding Actual combustion heat and the gas ratio valve meets preset standard functional relation, and then determines gaseous-pressure
It is whether sufficient；
Current low pressure maximum heating load computing unit, is connected with the currently practical calory burning computing unit, is used for
According to currently practical combustion curve and the default judgement current low pressure maximum heating load of line computation；
Water flow calculates output unit, is connected with the current low pressure maximum heating load computing unit, works as basis
Water flow needed for preceding low pressure maximum heating load and the current inflow temperature are calculated with current setting leaving water temperature, and described in output
Required water flow to the water flow adjusts unit；
Current desired calory burning computing unit, for according to the current inflow temperature, the current water flow and institute
It states current setting leaving water temperature and calculates current desired calory burning；
Temperature control unit is connected with the gaseous-pressure judging unit and the current desired calory burning computing unit
It connects, is selected to use the current low pressure maximum heating load or the current desired calory burning tune according to gaseous-pressure judging result
Gas fuel saving ratio valve opening and fan delivery control water heater currently to set leaving water temperature constant-temperature effluent.
Control system as described above, to avoid frequently judging because of interference, the gaseous-pressure judging unit determines institute
It states current gas ratio valve opening and when the currently practical calory burning is unsatisfactory for the preset standard functional relation, then judges
The size relation of the currently practical calory burning and the low pressure maximum heating load, and then determine whether gaseous-pressure is sufficient.
Preferably, it is water servomechanism that the water flow, which adjusts unit, and water heater is arranged in the water servomechanism
On the inlet pipeline.
Preferably, the temperature control unit is PID control unit.
In addition, the present invention also provides a kind of gas heaters with above-mentioned control system.
Compared with prior art, the advantages and positive effects of the present invention are: the present invention passes through the currently practical combustion of real-time monitoring
Whether the amount of heating and current gas ratio valve opening, judge gaseous-pressure according to the judgement to the functional relation between the two
Abundance, and water heater is limited in current low pressure maximum heating load relevant to currently practical combustion curve in gaseous-pressure deficiency
Lower work guarantees that water heater works under the optimal proportion of combustion gas and air, avoids and cause hot water because air air quantity is excessive
The problem of device is flame-out, jump fire.In addition, the water flow of water heater is adjusted in gaseous-pressure deficiency, disappeared with reducing heat
Consumption, guarantees that the leaving water temperature of water heater can reach setting leaving water temperature, meets user to the use demand of hot water.
After a specific embodiment of the invention is read in conjunction with the figure, the other features and advantages of the invention will become more clear
Chu.
Detailed description of the invention
Fig. 1 is the structural block diagram of control system one embodiment of gas heater of the present invention；
Fig. 2 is the flow chart of control method one embodiment of gas heater of the present invention；
Fig. 3 is the flow chart of another embodiment of the control method of gas heater of the present invention.
Specific embodiment
The technical scheme of the present invention will be explained in further detail with reference to the accompanying drawings and detailed description.
Referring to FIG. 1, the Fig. 1 show the structural block diagram of control system one embodiment of gas heater of the present invention.
As shown in Figure 1, the function and phase of each structure member, each structure member included by the control system of the embodiment
Connection relationship between mutually is as follows:
Inflow temperature sensor 2, is arranged on the inlet pipeline of water heater, for detecting the inflow temperature of water heater.
Leaving water temperature sensors 3, are arranged on the outlet pipeline of water heater, for detecting the leaving water temperature of water heater.
Water flow monitors sensor 4, is arranged on the inlet pipeline or outlet pipeline of water heater, for detecting water heater
Water flow.
Water flow adjusts unit 5, is arranged on the inlet pipeline or outlet pipeline of water heater, for adjusting the water of water heater
Flow.In this embodiment, water flow adjust unit 5 be preferably provided on inlet pipeline, and preferably using water servomechanism come
It realizes.
Gas ratio valve 6, is arranged on the air inlet pipeline of water heater, for controlling the gas quantity entered in water heater.
Blower 7, is arranged in below the gas burner of water heater, for controlling the air inlet amount entered in burner.
Above-mentioned each structure member is connected with the controller 1 in control system, and controller 1 as control system and
The control core of water heater includes following each structure members:
Currently practical calory burning computing unit 11, respectively with inflow temperature sensor 2, leaving water temperature sensors 3 and water
Flow monitoring sensor 4 is connected, and the current inflow temperature, leaving water temperature for being monitored according to inflow temperature sensor 2 pass
The current water flow that current leaving water temperature and water flow the monitoring sensor 4 that sensor 3 is monitored are monitored is currently practical to calculate
Calory burning.
Gaseous-pressure judging unit 12 is connected, for judging current reality with currently practical calory burning computing unit 11
Whether the current aperture of border calory burning and gas ratio valve 6 meets preset standard functional relation, and then determines that gaseous-pressure is
No abundance.Wherein, since the aperture of gas ratio valve 6 is controlled in itself by controller 1, gaseous-pressure judgement is single
Member 12 can easily read the aperture of current gas proportioning valve inside controller 1.
Current low pressure maximum heating load computing unit 13, with gaseous-pressure judging unit 12 and currently practical combustion heat meter
Unit 11 is calculated to be connected, it, will be according to by the currently practical combustion heat when gaseous-pressure judging unit 12 judges gaseous-pressure deficiency
Measure the currently practical combustion curve obtained and the default judgement current low pressure maximum heating load of line computation.
Water flow calculates output unit 14, input terminal and inflow temperature sensor 2 and current low pressure maximum heating load meter
It calculates unit 13 to be connected, output end adjusts unit 5 with water flow and is connected, will be according to current low pressure maximum heating load, water inlet
Water flow needed for the current inflow temperature and current setting leaving water temperature that temperature sensor 2 is monitored calculate, then exports institute
Water flow to water flow is needed to adjust unit 5.
Current desired calory burning computing unit 16 monitors 4 phase of sensor with inflow temperature sensor 2 and water flow respectively
Connection, for calculating current desired calory burning according to current inflow temperature, current water flow and current setting leaving water temperature.
Temperature control unit 15, as the control core of controller 1, respectively with water flow quantity detection sensor 4, leaving water temperature
Sensor 3, gas ratio valve 6, the current low pressure maximum heating load computing unit 13 of gaseous-pressure judging unit 12 and current desired
Calory burning computing unit 16 is connected, according to the selection of gaseous-pressure judging result using current low pressure maximum heating load or currently
The aperture of required calory burning regulating gas proportioning valve 6 and the air quantity of blower 7, and then control water heater and set out water temperature with current
Spend constant-temperature effluent.It specifically, is the current water flow monitored according to water flow quantity detection sensor 4, leaving water temperature sensors 3
The current leaving water temperature and setting leaving water temperature monitored is adjusted and controls, it is ensured that stable water outlet is in setting leaving water temperature.
Temperature control unit 15 can and preferably be realized using PID control unit.
The control system of the embodiment in gas heater, can be improved gas heater anti-stall ability and
Constant-temperature effluent performance.
The specific control process of the control system of above structure can referring to figs. 2 and 3 shown in flow chart and below it is right
The description of the two processes.
Referring to FIG. 2, being somebody's turn to do, Fig. 2 shows the flow charts of control method one embodiment of gas heater of the present invention.It should
The process of embodiment controls gas heater based on control system shown in FIG. 1.
As shown in Fig. 2, the embodiment controls gas heater, detailed process is as follows:
Step 201: process starts.
Step 202: water heater booting.
Step 203: whether the flow of inlet water for monitoring water heater is greater than starting flow.If so, executing step 204；Otherwise, after
Continuous monitoring, until flow of inlet water is greater than starting flow.
The purpose that the step is arranged is first to judge whether there is water flow and water flow is before Water heater igniting work
It is no to be greater than starting flow, the safety accidents such as dry combustion method occur to avoid because anhydrous or water flow is too small.
Step 204: when flow of inlet water is greater than starting flow, control Water heater igniting work.
Step 205: calculating currently practical calory burning.
After water heater working, the gas proportion valve opening of real-time monitoring water heater, current inflow temperature, current water outlet
Temperature and current water flow, water flow here can be water flow, be also possible to flow of inlet water, and two flow values are equal.
It is then possible to current real according to provided by current inflow temperature, current leaving water temperature and current water ga(u)ge calculating water heater
Border calory burning.For example, it is assumed that current inflow temperature is t1, current leaving water temperature is t2, current flow of inlet water is M, it is hot at this time
Water heat Q=M*(t2-t1 obtained) be water heater currently practical calory burning.
Wherein, current inflow temperature can be monitored by the temperature sensor being arranged on inlet pipeline, current to be discharged
Temperature can be monitored by the temperature sensor being arranged on outlet pipeline, and current water flow can intake by setting
Water flow on pipeline or outlet pipeline monitors sensor to monitor.
Step 206: judging whether currently practical calory burning and current gas ratio valve opening meet preset standard function
Relationship.If so, executing step 207；If it has not, executing step 208.
For gas heater, in regular combustion process, burn between generated heat and gas proportion valve opening
Meet specific functional relation, typically, it is directly proportional, which is defined as preset standard functional relation.For
A certain specific gas heater, which is determining.During water heater working, the control of water heater
Device processed is to carry out regulating gas ratio valve opening according to preset standard functional relation.And gas proportion valve opening and fan delivery it
Between there is also an optimal proportion relationships, therefore, adjust fan delivery while regulating gas ratio valve opening so that combustion
Gas burns under optimal combustion ratio, provides temperature constant hot water for user.If gaseous-pressure is insufficient, with gas ratio valve
The increase of aperture, gas quantity may not change.Correspondingly, gas proportion valve opening will deviate from currently practical calory burning it is pre-
It is marked with quasi-function relationship, namely does not meet the preset standard functional relation, so that calory burning caused by reality under the aperture
It will be less than according to the calculated heat of preset standard functional relation institute.It therefore, can be according to current combustion heat and current gas
Whether ratio valve opening meets preset standard functional relation to judge whether gaseous-pressure is insufficient.
Step 207: if currently practical calory burning and current gas ratio valve opening meet preset standard functional relation,
Determine that gaseous-pressure is sufficient, executes normal control process.Then, step 210 is gone to.
Normal control process mentioned here refers to the conventional control process for not considering gaseous-pressure problem.The process
Control method are as follows: calculated according to the current setting leaving water temperature of current inflow temperature, current water flow and user currently to set
Current desired calory burning required for leaving water temperature is discharged；Then, according to current desired calory burning and preset standard function
Relationship regulating gas ratio valve opening and fan delivery control water heater with the current setting leaving water temperature constant-temperature effluent.It is whole
A control process can be realized using pid algorithm in the prior art.
Step 208: if currently practical calory burning and current gas ratio valve opening do not meet preset standard function pass
System determines that gaseous-pressure is insufficient, according to current low pressure maximum heating load regulating water flow.Then, step 209 is executed.
If Actual combustion heat and current gas ratio valve opening do not meet preset standard functional relation, as described above,
Illustrate gaseous-pressure deficiency, and at this point, Actual combustion heat will be than according to the calculated combustion heat of preset standard functional relation institute
Amount wants small.It, can be because of blower if coming regulating gas ratio valve opening and fan delivery still according to preset standard functional relation
Provided air capacity is excessive and causes flame-out or jump fire.The embodiment is to avoid the generation of this problem, will determine one it is current
Low pressure maximum heating load is as lower attainable maximum heating load of current gas pressure, and as current maximum combustion heat
Amount, according to this current maximum combustion heat come regulating water flow.Here the selection principle of current low pressure maximum heating load is
Guarantee to make under the Low Pressure Gas Network allowed by water heater the calory burning and gas ratio valve within the scope of the thermic load as far as possible
Aperture still conforms to preset standard functional relation.Specifically, current low pressure maximum heating load is relevant to current gas pressure
One thermic load value, can be obtained by following methods: setting one default judgement line, the judgement line and preset standard function close
It is that shape is identical, but calory burning corresponding to same ratio valve opening is than the calory burning in preset standard functional relation
It is low.In gaseous-pressure deficiency, is fitted and worked as with corresponding currently practical calory burning according to current gas ratio valve opening
Preceding Actual combustion curve, currently practical combustion curve determines that line will intersect with default, by heat corresponding to cusp
Load is as current low pressure maximum heating load.It is right according to current gas ratio valve opening and institute if current gas pressure is different
Currently practical combustion curve that the currently practical calory burning answered is fitted is different, different currently practical combustion curve and pre-
If determine line intersection intersection point corresponding to thermic load can be not exactly the same, therefore, current low pressure maximum heating load be with currently
The relevant value of gaseous-pressure.
Select current low pressure maximum heating load as current maximum combustion heat after, for guarantee water heater go out water temperature
Degree can reach setting leaving water temperature, need that water flow is adjusted.Specific adjusting method are as follows: according to current low pressure maximum heat
Load, current inflow temperature and current setting leaving water temperature calculate required water flow, and then control is arranged in water outlet of water heater
Water flow adjusts unit to adjust current water flow to required water flow on pipeline or inlet pipeline.In this embodiment, water flow
Amount adjusts the preferred water servomechanism of unit, and is arranged on the inlet pipeline of water heater, to improve the accuracy of water control.
Step 209: executing low voltage control process.
Low voltage control process method particularly includes: using current low pressure maximum heating load as current desired calory burning, so
Afterwards according to current desired calory burning, i.e. the low pressure maximum heating load and preset standard functional relation regulating gas ratio valve opening
And fan delivery, water heater is controlled currently to set leaving water temperature constant-temperature effluent.Likewise, this control process can also use
Pid algorithm in the prior art is realized.
Step 210: normal control process or low voltage control process are executed by selecting water heater, so that constant temperature of water heater
Water outlet.
Step 211: judging whether setting time reaches or whether water heater restarts.If so, going to step 205；It is no
Then, step 212 is executed.
In the case of gaseous-pressure is low caused by changing because of pipeline pressure, gaseous-pressure can generally be continued for some time.
In order to avoid frequent progress calculate and multilevel iudge spent by the time, which holds using at interval of certain setting time
The process of row low pressure judgement.Therefore, preset a setting time, when setting time reaches, then go to step 205, again into
The monitoring of row Low Pressure Gas Network.In this embodiment, if water heater restarts, it is also desirable to re-execute the monitoring of Low Pressure Gas Network
Treatment process.
Step 212: in constant temperature of water heater water outlet and when setting time does not reach and water heater does not restart, sentencing
Whether the water flow or inflow temperature or setting leaving water temperature of disconnected water heater change.If do not changed, step is gone to
210, continue to carry out work with current ratio valve opening and fan delivery, control constant temperature of water heater water outlet；If these parameters exist
Variation, thens follow the steps 213.
Step 213: if the current flow of inlet water or inflow temperature of water heater or setting leaving water temperature are changed, after
The continuous control process executed before variation.
Specifically, if what is executed before Parameters variation is normal control process, according to current inflow temperature, currently
The current setting leaving water temperature of water flow and user are calculated currently to set current desired burning required for leaving water temperature is discharged
Heat；Then, according to current desired calory burning and preset standard functional relation regulating gas ratio valve opening and fan delivery,
Water heater is controlled with the current setting leaving water temperature constant-temperature effluent.And if what is executed before variation is low voltage control process,
It is then maximum according to current desired calory burning, the i.e. low pressure then using low pressure maximum heating load as current desired calory burning
Thermic load and preset standard functional relation regulating gas ratio valve opening and fan delivery, control water heater are discharged with current setting
Thermostatic water outlet.
The embodiment passes through the currently practical calory burning of real-time monitoring and current gas ratio during water heater working
Valve opening judges whether gaseous-pressure is sufficient according to the judgement to the functional relation between the two, additional without adding
Hardware gaseous-pressure monitoring device, reduces gaseous-pressure monitoring cost.And control water heater in gaseous-pressure deficiency it is not
It shuts down, but limits water heater and come work, comparative example valve, wind under current low pressure maximum heating load, according to canonical function relationship
Machine and water flow regulating device etc. carry out linkage control, can guarantee that water heater works under the optimal proportion of combustion gas and air, keep away
Exempt to cause the failure of water heater extinguishing, jump fire because air air quantity is excessive, it is ensured that the leaving water temperature of water heater can reach
Set leaving water temperature, meet user to the use demand of hot water, thus for user provide it is safer, comfortably with water side
Case.
Referring to FIG. 3, the Fig. 3 show the flow chart of control method one embodiment of gas heater of the present invention.It should
The process of embodiment controls gas heater also based on control system shown in FIG. 1.
As shown in figure 3, the embodiment controls gas heater, detailed process is as follows:
Step 301: process starts.
Step 302: water heater booting.
Step 303: whether the flow of inlet water for monitoring water heater is greater than starting flow.If so, executing step 304；Otherwise, after
Continuous monitoring, until flow of inlet water is greater than starting flow.
Step 304: when flow of inlet water is greater than starting flow, control Water heater igniting work.
Step 305: calculating currently practical calory burning.
Step 306: judging whether currently practical calory burning and current gas ratio valve opening meet preset standard function
Relationship.If so, executing step 307；If it has not, executing step 308.
Step 307: if currently practical calory burning and current gas ratio valve opening meet preset standard functional relation,
Determine that gaseous-pressure is sufficient, executes normal control process.Then, step 310 is gone to.
Above steps is identical as Fig. 2 embodiment, and specific method and function can retouch Fig. 2 corresponding steps with reference to above-mentioned
It states.
Step 308: if currently practical calory burning and current gas ratio valve opening do not meet preset standard function pass
System, then judge whether currently practical calory burning is less than current low pressure maximum heating load.If so, executing step 309；Otherwise, turn
To step 307.
In view of gaseous-pressure may generate of short duration insufficient pressure because of various interference, but can restore quickly normal
Pressure, to reduce the complexity and time consuming nature, the reality that are continually judged and controlled conversion because of this temporary interference
It applies example and is additionally arranged double Rule of judgment.Preset standard letter is not met in currently practical calory burning and current gas ratio valve opening
When number relationship, first judge whether currently practical calory burning is less than current low pressure maximum heating load.If it is not, thinking combustion gas
Pressure is only of short duration deficiency, still executes the normal control process of step 307.Only it is less than in currently practical calory burning current
When low pressure maximum heating load, gaseous-pressure deficiency is just thought, and execute subsequent low voltage control process.Current low pressure maximum heat is negative
The acquisition of lotus can be with reference to described in Fig. 2 embodiment.
Step 309: if currently practical calory burning is less than current low pressure maximum heating load, determine that gaseous-pressure is insufficient,
According to current low pressure maximum heating load regulating water flow.
Step 310: executing low voltage control process.
Step 311: normal control process or low voltage control process are executed by selecting water heater, so that constant temperature of water heater
Water outlet.
Step 312: judging whether setting time reaches or whether water heater restarts.If so, going to step 305；It is no
Then, step 313 is executed.
Step 313: in constant temperature of water heater water outlet and when setting time does not reach and water heater does not restart, sentencing
Whether the water flow or inflow temperature or setting leaving water temperature of disconnected water heater change.If do not changed, step is gone to
311, continue to carry out work with current ratio valve opening and fan delivery, control constant temperature of water heater water outlet；If these parameters exist
Variation, thens follow the steps 314.
Step 314: if the current flow of inlet water or inflow temperature of water heater or setting leaving water temperature are changed, after
The continuous control process executed before variation.
The concrete methods of realizing and function of above-mentioned steps 309 to step 314 can be with reference to the descriptions of corresponding steps in Fig. 2.
The above embodiments are merely illustrative of the technical solutions of the present invention, rather than is limited；Although referring to aforementioned reality
Applying example, invention is explained in detail, for those of ordinary skill in the art, still can be to aforementioned implementation
Technical solution documented by example is modified or equivalent replacement of some of the technical features；And these are modified or replace
It changes, the spirit and scope for claimed technical solution of the invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of control method of gas heater, which is characterized in that the method includes the following steps:
A, during water heater working, monitoring water heater current gas ratio valve opening, currently goes out water temperature at current inflow temperature
Degree and current water flow calculate current according to the current inflow temperature, the current leaving water temperature and the current water flow
Actual combustion heat；
B, judge whether the current gas ratio valve opening and the currently practical calory burning meet preset standard function pass
System selects to execute step c or step d according to judging result；
C, the preset standard function is not met in the current gas ratio valve opening and the currently practical calory burning to close
When being, determine that gaseous-pressure is insufficient, determine current low pressure maximum heating load, and according to current low pressure maximum heating load, described work as
Advance coolant-temperature gage and current setting leaving water temperature adjust the current water flow to required water flow, then by the current low pressure
Maximum heating load is adjusted as current maximum combustion heat according to current maximum combustion heat and the preset standard functional relation
Gas proportion valve opening and fan delivery control water heater with the current setting leaving water temperature constant-temperature effluent；
D, meet the preset standard functional relation in the current gas ratio valve opening and the currently practical calory burning
When, determine that gaseous-pressure is sufficient, execute normal control process, water heater is controlled with described current according to current desired calory burning
Set leaving water temperature constant-temperature effluent；
Wherein, the current low pressure maximum heating load is right for the currently practical combustion curve of water heater and the default intersection point for determining line
The thermic load answered.
2. control method according to claim 1, which is characterized in that in the step c, in the current gas ratio
When valve opening and the currently practical calory burning do not meet the preset standard functional relation, the currently practical combustion is first judged
Whether the amount of heating is less than the current low pressure maximum heating load, is less than the current low pressure most in the currently practical calory burning
When big thermic load, the current water flow is adjusted further according to the current low pressure maximum heating load.
3. control method according to claim 1, which is characterized in that the normal control process includes the following steps:
D1, current desired burning is calculated according to the current inflow temperature, the current water flow and current setting leaving water temperature
Heat；
D2, according to current desired calory burning and the preset standard functional relation regulating gas ratio valve opening and blower wind
Amount controls water heater with the current setting leaving water temperature constant-temperature effluent.
4. control method according to any one of claim 1 to 3, which is characterized in that in setting time arrival or hot water
After device restarting, the process of the step a to d is executed.
5. control method according to claim 1, which is characterized in that the current water flow is the feed water flow of water heater
Amount, water servomechanism is provided in the inlet pipeline of water heater, controls the water servomechanism to adjust the flow of inlet water.
6. a kind of control system of gas heater, including be arranged on heater inleting pipe road inflow temperature sensor, set
It sets the leaving water temperature sensors on outlet pipeline, the water flow monitoring sensor for monitoring water flow of water heater amount, control combustion gas
Gas ratio valve, control air inlet amount blower and controller, which is characterized in that the system also includes with the controller
It is connected, the water flow adjusting unit for adjusting water flow of water heater amount, the controller includes:
Currently practical calory burning computing unit, current inflow temperature for being monitored according to the inflow temperature sensor,
The current water flow that the current leaving water temperature and water flow monitoring sensor that the leaving water temperature sensors are monitored are monitored
Amount is to calculate currently practical calory burning；
Gaseous-pressure judging unit is connected, for judging the current reality with the currently practical calory burning computing unit
Whether the aperture of border calory burning and current gas proportioning valve meets preset standard functional relation, and then whether determines gaseous-pressure
It is sufficient；
Current low pressure maximum heating load computing unit, sentences with the currently practical calory burning computing unit and the gaseous-pressure
Disconnected unit is connected, for according to currently practical combustion curve and the default judgement current low pressure maximum heating load of line computation；
Water flow calculates output unit, is connected with the current low pressure maximum heating load computing unit, for according to current low
Water flow needed for pressing maximum heating load and the current inflow temperature to calculate with current setting leaving water temperature, and export described required
Water flow to the water flow adjusts unit；
Current desired calory burning computing unit, for according to the current inflow temperature, the current water flow and described working as
Preceding setting leaving water temperature calculates current desired calory burning；
Temperature control unit is connected with the gaseous-pressure judging unit and the current desired calory burning computing unit,
It selects to adjust using the current low pressure maximum heating load or the current desired calory burning according to gaseous-pressure judging result
Gas proportion valve opening and fan delivery control water heater currently to set leaving water temperature constant-temperature effluent.
7. control system according to claim 6, which is characterized in that the gaseous-pressure judging unit determines described current
When gas proportion valve opening and the currently practical calory burning are unsatisfactory for the preset standard functional relation, then judge described work as
The size relation of preceding Actual combustion heat and the current low pressure maximum heating load, and then determine whether gaseous-pressure is sufficient.
8. control system according to claim 6 or 7, which is characterized in that it is water servo that the water flow, which adjusts unit,
Device, and the water servomechanism is arranged on the inlet pipeline of water heater.
9. control system according to claim 6 or 7, which is characterized in that the temperature control unit is PID control list
Member.
10. a kind of gas heater, which is characterized in that the water heater has described in any one of the claims 6 to 9
Control system.
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| CN201310301582.2A CN104296386B (en) | 2013-07-18 | 2013-07-18 | Control method, control system and the gas heater of gas heater |
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| CN201310301582.2A CN104296386B (en) | 2013-07-18 | 2013-07-18 | Control method, control system and the gas heater of gas heater |
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| CN104296386A CN104296386A (en) | 2015-01-21 |
| CN104296386B true CN104296386B (en) | 2019-01-08 |
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