CN109724237B - Secondary pressure adjusting method for gas water heater and gas water heater - Google Patents
Secondary pressure adjusting method for gas water heater and gas water heater Download PDFInfo
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Abstract
The invention relates to the field of gas water heaters, and particularly discloses a secondary pressure adjusting method of a gas water heater and the gas water heaterPreset ofRecording the corresponding maximum current ImaxAnd minimum current Imin(ii) a According to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening max(ii) a According to the current IOpening minAnd IOpening maxAnd acquiring a secondary pressure interval of the corresponding gas water heater. According to the invention, during the production process or after-sale debugging of the secondary pressure, the surface shell of the gas water heater does not need to be disassembled, the external micro-pressure device does not need to detect the secondary pressure of the gas water heater in real time, and the secondary pressure is adjusted through the controller of the gas water heater, so that the secondary pressure adjusting efficiency is improved.
Description
Technical Field
The invention relates to the field of gas water heaters, in particular to a secondary pressure adjusting method of a gas water heater and the gas water heater.
Background
In order to achieve better combustion efficiency, the gas in the gas pipeline needs to be adjusted by a proportional valve inside the gas water heater, and the pressure adjusted by the proportional valve is the secondary pressure of the gas, namely the pressure behind the proportional valve. The secondary pressure of the gas water heater is an important index influencing the performance of the gas water heater, and the combustion interval of the gas water heater is determined by setting the secondary pressure interval of the gas water heater before leaving a factory.
The existing secondary pressure adjusting method is to reserve a pressure measuring port on a proportional valve and connect a micro-pressure device to the pressure measuring port by adopting a hose; the current of the proportional valve is changed by manually adjusting the resistance value of the potentiometer, and then the opening degree of the proportional valve is adjusted, so that the secondary pressure interval of the gas water heater is determined.
The method for adjusting the secondary pressure of the gas water heater has the following problems:
1) the adjusting method is too complicated, and the proportional valve is arranged in the gas water heater and can be adjusted only by opening the surface shell of the gas water heater;
2) the resistance of the manual adjustment potentiometer is poor in consistency and low in accuracy, so that parameters of all gas water heaters of the same type are inconsistent;
3) the size of the secondary pressure in the gas water heater can not be known in real time, and whether the secondary pressure is normal or not can not be monitored.
Disclosure of Invention
The invention aims to provide a secondary pressure adjusting method for a gas water heater, and aims to solve the technical problem of the existing secondary pressure adjusting method for the gas water heater.
In order to achieve the purpose, the invention adopts the following technical scheme:
a secondary pressure adjusting method of a gas water heater, the gas water heater is provided with a proportional valve,
adjusting the PWM value to enable the pressure behind the proportional valve to reach the preset secondary pressure PPreset ofRecording the corresponding maximum current ImaxAnd minimum current Imin；
According to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening max；
According to the current IOpening minAnd IOpening maxAnd acquiring a secondary pressure interval of the corresponding gas water heater.
Further, the PWM value is adjusted to enable the corresponding pressure to reach the preset secondary pressure PPreset ofRecording the corresponding maximum current ImaxAnd minimum current IminComprises that
Increasing the PWM value from small to large in sequence, and recording that the preset secondary voltage P is reachedPreset ofMinimum current I ofmin；
Increasing the PWM value from large to small in sequence, and recording that the preset secondary voltage P is reachedPreset ofMaximum current I ofmax。
Further, according to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening maxComprises that
Obtaining the maximum current ImaxAnd minimum current IminWeighted average value of I0＝(a*Imax+b*Imin)/2；
Calculating the current I corresponding to the minimum opening of the proportional valveOpening degree min ═＝K*I0A, and the current I corresponding to the maximum opening of the proportional valveOpening max＝K*I0+B，
Wherein, K, A, B, a and b are characteristic parameters of the proportional valve.
Further, according to the current IOpening minAnd IOpening maxObtaining a secondary pressure interval of a corresponding gas water heater, comprising
Obtaining said current IOpening minAnd IOpening maxAnd obtaining a corresponding secondary voltage interval according to the range of the PWM value.
Further, the obtaining of the current IOpening minAnd IOpening maxObtaining corresponding PWM values, including
Obtaining a current range Δ I ═ IOpening max-IOpening min；
Dividing the current range Delta I into N equal parts, and calculating each current Ii＝IOpening min+N*(IOpening max-IOpening min) N is 0, 1, 2,.. N, N is a natural number;
calculating each of said currents IiThe corresponding PWM value.
Further, the obtaining of the corresponding secondary nip according to the range of the PWM value includes
And acquiring the range of the corresponding proportional valve opening according to the range of the PWM value, and acquiring the corresponding secondary nip through the range of the proportional valve opening.
Further, the PWM value and the secondary pressure are in positive linear correlation with the opening degree of the proportional valve.
In order to achieve the purpose, the invention also provides a gas water heater, which comprises a controller and a secondary pressure detection device connected with the controller, wherein the secondary pressure of the gas water heater is adjusted by adopting the secondary pressure adjusting method of the gas water heater.
Further, this gas heater still includes the display module, the display module electricity is connected in the controller, the display module includes display and adjustment button.
The invention has the beneficial effects that: the invention can obtain the whole secondary pressure interval of the gas water heater by selecting the current corresponding to the secondary pressure of one point, namely, the PWM value is adjusted to ensure that the pressure behind the proportional valve reaches the preset secondary pressure PPreset ofAnd recording the corresponding maximum current ImaxAnd minimum current IminPassing through the maximum current ImaxAnd minimum current IminTo preset secondary pressure PPreset ofThe corresponding actual current is compensated and calculated to obtain the ideal current, and then the maximum current I is passedmaxAnd minimum current IminAnd a predetermined secondary pressure PPreset ofObtaining the current I corresponding to the maximum opening of the proportional valve according to the function relation between the corresponding currentsOpening maxAnd the current I corresponding to the minimum opening of the proportional valveOpening minThen through IOpening maxAnd IOpening minAnd acquiring a secondary pressure interval of the corresponding gas water heater.
The secondary pressure adjusting method of the gas water heater is simple, the surface shell of the gas water heater does not need to be disassembled during production or after-sale secondary pressure adjusting, a manual external micro-pressure device does not need to detect the secondary pressure of the gas water heater in real time, a potentiometer is not needed, the secondary pressure is adjusted through a controller of the gas water heater, and the secondary pressure adjusting efficiency is improved.
Drawings
FIG. 1 is a graph of secondary voltage as a function of current for a gas water heater;
FIG. 2 is a flow chart of a method for adjusting the secondary pressure of a gas water heater according to the present invention.
Detailed Description
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
The embodiment provides a secondary pressure adjusting method for a gas water heater, wherein the gas water heater is provided with a proportional valve, and the method comprises the following steps: adjusting the PWM value to enable the pressure behind the proportional valve to reach the preset secondary pressure PPreset ofRecording the corresponding maximum current ImaxAnd minimum current Imin(ii) a According to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening max(ii) a According to the current IOpening minAnd IOpening maxAnd acquiring a secondary pressure interval of the corresponding gas water heater.
In this embodiment, as shown in fig. 1, which is a functional relationship diagram between the secondary pressure and the current of the gas water heater, when the proportional valve is in operation, a relationship curve formed by each opening and the corresponding current in the adjustment process from the maximum opening to the minimum opening, and a relationship curve formed by each opening and the corresponding current in the adjustment process from the minimum opening to the maximum opening are not a complete linear relationship, and the higher the precision of the proportional valve is, the smaller the difference between the two relationship curves is, the closer the relationship is to the linear relationship, but the price of the corresponding proportional valve is higher. Ideally, the secondary voltage and the current of the gas water heater satisfy a positive correlation linear relationship. In actual operation, the secondary pressure and the current of the proportional valve need to satisfy the ideal linear relationship, so that when the gas water heater is actually assembled, the corresponding relationship between the secondary pressure and the current needs to be adjusted to satisfy the one-to-one positive correlation function relationship, so as to improve the combustion efficiency of the gas water heater.
The PWM value and the secondary pressure are in positive linear correlation with the opening degree of the proportional valve. Therefore, the secondary voltage can be adjusted by adjusting the PWM value.
In the embodiment, the whole secondary pressure interval of the gas water heater can be obtained by selecting the current corresponding to the secondary pressure of one point, namely, the PWM value is adjusted to enable the pressure behind the proportional valve to reach the preset secondary pressure PPreset ofAnd recording the corresponding maximum current ImaxAnd minimum current IminPassing through the maximum current ImaxAnd minimum current IminTo preset secondary pressure PPreset ofThe corresponding actual current is compensated and calculated to obtain the ideal current, and then the maximum current I is passedmaxAnd minimum current IminAnd a predetermined secondary pressure PPreset ofThe current I corresponding to the minimum opening of the proportional valve is obtained according to the functional relation between the corresponding currentsOpening minAnd the current I corresponding to the maximum opening of the proportional valveOpening maxThen through IOpening minAnd IOpening maxAnd acquiring a secondary pressure interval of the corresponding gas water heater.
The secondary pressure adjusting method for the gas water heater is simple, the shell of the gas water heater does not need to be detached in the production process or after-sale secondary pressure adjusting, the manual external micro-pressure device does not need to detect the secondary pressure of the gas water heater in real time, a potentiometer does not need to be arranged, the secondary pressure is adjusted through the controller of the gas water heater, and the secondary pressure adjusting efficiency is improved.
Fig. 2 is a flowchart of a secondary pressure adjustment method for a gas water heater in this embodiment, which specifically includes the following steps:
step one, adjusting a PWM value to enable the pressure behind the proportional valve to reach a preset secondary pressure PPreset ofRecording the corresponding maximum current ImaxAnd minimum current Imin。
The preset secondary pressure PPreset ofThe pressure after the valve of the proportional valve is the pressure after the water heater operates according to the preset power, wherein the preset power is any power gear in the power gears of the water heater.
Specifically, the PWM values are increased from small to large in sequence, and the preset secondary voltage P is recordedPreset ofMinimum current I ofmin(ii) a Reducing the PWM value from large to small in sequence, and recording that the preset secondary pressure P is reachedPreset ofMaximum current I ofmax。
The preset secondary pressure PPreset ofOther pressures can be selected, and the corresponding preset secondary pressure P is determined according to the power gear of the water heaterPreset ofNamely, in carrying outDuring the related calculation, the characteristic parameters of the proportional valve are changed correspondingly.
Step two, according to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening max。
The specific calculation process is as follows, obtaining the maximum current ImaxAnd minimum current IminWeighted average value of I0＝(a*Imax+b*Imin) 2; calculating the current I corresponding to the minimum opening of the proportional valveOpening degree min ═＝K*I0A, and the current I corresponding to the maximum opening of the proportional valveOpening max＝K*I0+ B, wherein K, A, B, a and B are characteristic parameters of the proportional valve. Each proportional valve is provided with a corresponding characteristic parameter table, and the corresponding characteristic parameter can be found from the corresponding proportional valve characteristic parameter table.
Step three, obtaining the current IOpening minAnd IOpening maxCorresponding ranges of PWM values.
Since the PWM value controls the magnitude of the current and the PWM value are in a linear positive correlation, the current is controlled according to the current IOpening minCan obtain corresponding PWMminAccording to the current IOpening maxCan obtain corresponding PWMmaxAnd then determines the range of PWM values.
The specific calculation process is as follows, obtaining the current range delta I ═ IOpening max-IOpening min(ii) a Dividing the current range Delta I into N equal parts, and calculating each current Ii＝IOpening min+N*(IOpening max-IOpening min) N is 0, 1, 2,.. N, N is a natural number; calculating each of said currents IiThe corresponding PWM value.
And step four, acquiring a corresponding secondary voltage interval according to the range of the PWM value.
Since the PWM value is linearly and positively correlated with the secondary voltage, a corresponding secondary voltage interval can be obtained according to the range of the PWM value.
For the gas water heaters of the same model, if the proportional valves of the same model are installed, the secondary pressure is adjusted by adopting the secondary pressure adjusting method for the gas water heaters, so that the consistency of the secondary pressure of the gas water heaters of the same model can be realized, and the problem of poor consistency of secondary pressure parameters of the gas water heaters of the same model is solved.
The embodiment also provides a gas water heater, which comprises a controller and a secondary pressure detection device connected to the controller, wherein the secondary pressure of the gas water heater is adjusted by adopting the secondary pressure adjusting method of the gas water heater, so that the secondary pressure adjusting method of the gas water heater can be simplified, and the secondary pressure adjusting efficiency is improved.
The gas water heater also comprises a display module, wherein the display module is electrically connected with the controller and comprises a display and an adjusting button.
When the secondary pressure interval of the gas water heater needs to be adjusted, the secondary pressure of the gas water heater can be adjusted according to the secondary pressure adjusting method of the embodiment by pressing the adjusting button, and meanwhile, the size of the secondary pressure can be displayed in real time through the display.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (7)
1. A secondary pressure adjusting method for a gas water heater is characterized in that the gas water heater is provided with a proportional valve,
adjusting the PWM value to enable the pressure behind the proportional valve to reach the preset secondary pressure PPreset ofRecording the corresponding maximum current ImaxAnd minimum current Imin；
According to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening max；
According to the current IOpening minAnd IOpening maxAcquiring a secondary pressure interval of the corresponding gas water heater;
adjusting the PWM value to enable the pressure behind the proportional valve to reach the preset secondary pressure PPreset ofRecording the corresponding maximum current ImaxAnd minimum current IminComprises that
Increasing the PWM value from small to large in sequence, and recording that the preset secondary voltage P is reachedPreset ofMinimum current I ofmin；
Reducing the PWM value from large to small in sequence, and recording that the preset secondary pressure P is reachedPreset ofMaximum current I ofmax；
According to the maximum current ImaxMinimum current IminAnd calculating the current I corresponding to the minimum opening and the maximum opening of the proportional valve by compensating the characteristic parameters of the proportional valveOpening minAnd IOpening maxComprises that
Obtaining the maximum current ImaxAnd minimum current IminWeighted average value of I0=（a*Imax+b*Imin）/2；
Calculating the current I corresponding to the minimum opening of the proportional valveOpening min ==K*I0A, and the current I corresponding to the maximum opening of the proportional valveOpening max=K*I0+B，
Wherein, K, A, B, a and b are characteristic parameters of the proportional valve;
the preset secondary pressure PPreset ofThe pressure after the valve of the proportional valve is the pressure after the water heater operates according to the preset power, wherein the preset power is any power gear in the power gears of the water heater; determining corresponding preset secondary pressure P according to power gear of water heaterPreset of。
2. The method of claim 1 wherein said adjusting is based on said current IOpening minAnd IOpening maxObtaining a secondary pressure interval of a corresponding gas water heater, comprising
Obtaining said current IOpening minAnd IOpening maxAnd obtaining a corresponding secondary voltage interval according to the range of the PWM value.
3. The method of claim 2, wherein said obtaining said current I is performed by a method of adjusting a secondary pressure of a gas water heaterOpening minAnd IOpening maxObtaining a corresponding range of PWM values, including
Obtaining a current range Δ I = IOpening max-IOpening min；
Dividing the current range Delta I into N equal parts, and calculating each current Ii=IOpening min + N*（IOpening max-IOpening min) N =0, 1, 2, ·, N is a natural number;
calculating each of said currents IiThe corresponding PWM value.
4. The method of claim 2, wherein said obtaining a corresponding secondary pressure interval according to the range of the PWM value comprises
And acquiring the range of the corresponding proportional valve opening according to the range of the PWM value, and acquiring the corresponding secondary nip through the range of the proportional valve opening.
5. The secondary pressure adjustment method for the gas water heater according to claim 1, wherein the PWM value is linearly and positively correlated with the secondary pressure and the opening degree of the proportional valve.
6. A gas water heater, including the controller, and connect to the secondary pressure checkout gear of the controller, characterized by, adopt the secondary pressure of the gas water heater to adjust the secondary pressure of the gas water heater of any one of the adjusting method of the secondary pressure of the gas water heater of claim 1 to 5.
7. The gas water heater of claim 6, further comprising a display module electrically connected to the controller, the display module including a display and an adjustment button.
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