A direct-current fan self-adaptive air pressure and air volume control method for a gas water heater

Abstract

The application discloses a kind of gas water heater direct current fan self-adapting air pressure and air volume control method, corresponding fan air pressure data is quantified under different heat load state by direct current fan when gas water heater normal combustion, and this data characteristic is referenced to carry out self-adapting air pressure and air volume control on software algorithm, the fan air pressure data corresponding to load under the normal combustion state of water heater is calculated, when exhaust pipe air pressure changes and air pressure data do not match, can quickly respond to carry out self-adapting air pressure and air volume adjustment.

Description

TECHNICAL FIELD

[0001] The application relates to a direct-current fan adaptive wind pressure and wind volume control method for a gas water heater. BACKGROUND

[0002] Due to influences of different working environments, wind pressure changes, exhaust hole blockage and the like, exhaust pipes of market constant-temperature gas water heaters appear in different conditions such as backdraft and wind blockage, so that wind pressure and wind volume of the current water heater do not match combustion load, combustion is insufficient, exhaust CO and NO components exceed the standard, and human body is easily uncomfortable or even poisoned, and the existing constant-temperature gas water heater identifies wind pressure difference by setting a wind pressure sensor to increase wind volume, but setting the wind pressure sensor increases the cost of the constant-temperature gas water heater, and the sensor fails to increase the wind pressure. SUMMARY

[0003] The application overcomes the shortcomings of the prior art and provides a direct-current fan adaptive wind pressure and wind volume control method for a gas water heater.

[0004] To achieve the above-mentioned purpose, the application adopts the following technical scheme:

[0005] A direct-current fan adaptive wind pressure and wind volume control method for a gas water heater, steps of which are as follows:

[0006] S1, setting a fan drive duty cycle adapted by a gas water heater device in a normal constant-temperature water outlet state and a fan current corresponding to a current duty cycle and a wind speed , and a reference fan wind pressure of the current duty cycle ; testing the gas water heater, dividing a fan drive signal duty cycle working range into equal parts, thereby obtaining and recording drive duty cycles , fan currents , wind speeds and reference wind pressures of each corresponding equal part;

[0007] S2, stably combusting the gas water heater to obtain a real-time fan drive duty cycle , a real-time fan current and a real-time fan wind speed ;

[0008] S3, calculating a real-time fan wind pressure , a real-time fan drive duty cycle reference wind pressure value , thereby obtaining a real-time fan current and a real-time reference fan current , and judging the real-time fan current And real-time reference fan current Size relationship

[0009] S4, when the real-time fan current is less than the real-time reference fan current , PID automatic control is adopted as the target value to adjust the fan drive duty cycle, and jump to S6;

[0010] S5, when the real-time fan current is greater than the real-time reference fan current , after the air supply treatment is performed, the fan drive duty cycle wind speed of the current load default is returned, and jump to S6;

[0011] S6, when the user adjusts the temperature or the flow rate changes the combustion load, jump to S2, otherwise keep the current fan drive duty cycle working.

[0012] The direct-current fan adaptive wind pressure and air volume control method of the gas water heater as described above, characterized in that: the fan drive signal duty cycle working range in S1 is between the hot water set minimum wind speed fan drive signal duty cycle and the hot water set maximum wind speed fan drive signal duty cycle .

[0013] The direct-current fan adaptive wind pressure and air volume control method of the gas water heater as described above, characterized in that: the value range of N in S1 is 8-10.

[0014] The direct-current fan adaptive wind pressure and air volume control method of the gas water heater as described above, characterized in that: the fan wind pressure of the blocked exhaust hole in S1 is set to , and satisfies .

[0015] The direct-current fan adaptive wind pressure and air volume control method of the gas water heater as described above, characterized in that: the fan wind pressure of the blocked exhaust hole in S1 is set to , and satisfies .

[0016] The beneficial effects of the present application are:

[0017] The present application quantifies the corresponding fan wind pressure data under different heat load states of the direct-current fan during normal combustion of the gas water heater, and performs adaptive wind pressure air supply control on the software algorithm by referring to the data characteristics, calculates the fan wind pressure data corresponding to the load under the normal combustion state of the water heater, and when the exhaust pipe wind pressure changes and the wind pressure data do not match, can quickly respond to adaptive wind pressure and air volume adjustment, saves the cost of the wind pressure sensor, and avoids the situation that the sensor fails to increase the wind pressure. BRIEF DESCRIPTION OF DRAWINGS​

[0018] Figure 1 This is a schematic diagram of the invention;

[0019] Figure 2 This is a schematic diagram illustrating the quantification of corresponding fan pressure data under different heat load conditions during normal combustion of the gas water heater of the present invention. Detailed Implementation

[0020] The technical solutions in the embodiments of the present invention will now be clearly and completely described in conjunction with the accompanying drawings.

[0021] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly. Furthermore, descriptions involving "preferred," "second-best," etc., in this invention are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "preferred" or "second-best" may explicitly or implicitly include at least one of those features.

[0022] In water heater equipment, DC fans are commonly controlled by constant current. The air volume can be controlled by adjusting the fan speed through a voltage signal with a variable duty cycle.

[0023] like Figure 1 As shown, an adaptive air pressure and air volume control method for a gas water heater's DC fan includes the following steps:

[0024] S1. The fan drive duty cycle adapted to the gas water heater equipment under normal constant temperature water output conditions. and the fan current corresponding to the current duty cycle and wind speed Identify and quantify the reference fan pressure at the current duty cycle. Furthermore, based on the sampled fan pressure data (collecting fan current and wind speed data for simulated combustion under normal conditions and with blocked exhaust vents), the established relationship is satisfied. And with the same drive duty cycle As shown below Figure 2 ;

[0025] Test the gas water heater and, based on the above relationship, determine the duty cycle operating range of the fan drive signal. , Internal The baseline wind during normal combustion was obtained by sampling data from equal portions. Under the same gas reference stable condition, the gas water heater was measured in N equal parts The load corresponding to the value of the normal combustion, and the fan current when reaching stable and the wind speed , and the reference wind pressure of the current heating section is calculated by the relationship , and the measured data table is obtained and recorded. The value of N is in the range of 8-10, which is set according to the linearity of the wind pressure data, and The minimum wind speed fan drive signal duty cycle is set for hot water, The maximum wind speed fan drive signal duty cycle is set for hot water.

[0026] S2, when the gas water heater is working and the combustion is stable, the fan drive duty cycle corresponds to the real-time fan drive value , the real-time current of the fan , the real-time wind speed of the fan ;

[0027] S3, the real-time wind pressure of the fan is calculated , and the corresponding fan drive duty cycle reference wind pressure value at this time can be calculated in real time from the measured wind pressure data table by Figure 2 linear relationship:

[0028]

[0029] , so as to obtain the real-time fan current and the real-time reference fan current , and only need to compare the size relationship between and to determine whether the current wind pressure changes and further adjust to obtain the wind increase process, so as to determine the size relationship between the real-time fan current and the real-time reference fan current ;

[0030] S4, when the real-time fan current is less than the real-time reference fan current , it is considered that the current pressure changes and the wind volume needs to be increased to increase the wind, and because there is , the traditional PID adjustment method is used to approach the target value , the fan drive duty cycle is adjusted, and jumps to S6;

[0031] S5, when the real-time fan current is greater than the real-time reference fan current , after the wind increase process, the current load default fan drive duty cycle wind speed​​ jump to S6;

[0032] S6, when the user adjusts the temperature or the water flow rate changes the combustion load, jump to S2, otherwise keep the value of the fan drive duty cycle work.

[0033] The present application quantifies the corresponding fan pressure data under different heat load states of the direct current fan during normal combustion of the water heater, and performs adaptive fan pressure and air volume control on the software algorithm by referring to the data characteristics. The fan pressure data corresponding to the load under the normal combustion state of the water heater is calculated. When the exhaust pipe pressure change and the fan pressure data do not match, adaptive fan pressure and air volume adjustment can be quickly responded.

[0034] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application. Any equivalent structural transformation, direct or indirect application in other related technical fields within the inventive concept of the present application and the content of the specification and drawings are included in the patent protection range of the present application.

Claims

1. A direct-current fan adaptive wind pressure and air volume control method for a gas water heater, comprising the following steps: S1, set the fan drive duty cycle adapted by the gas water heater device in the normal constant temperature water outlet state And the current duty cycle corresponding fan current And wind speed And the reference fan pressure of the current duty cycle Test the gas water heater, divide the fan drive signal duty cycle working range into Equal parts, so as to obtain and record each corresponding equal part of the drive duty cycle Fan current Wind speed And reference pressure ; S2, the gas water heater stabilizes combustion, to obtain a fan real-time driving duty cycle , fan real-time current , and fan real-time wind speed ; S3, calculate the real-time fan pressure At this time, the real-time fan drive duty cycle reference fan pressure value , so as to obtain the real-time fan current And the real-time reference fan current , and determine the size relationship between the real-time fan current And the real-time reference fan current ; S4, when real-time fan current is less than real-time reference fan current , take PID automatic control to adjust fan drive duty cycle with as target value, jump to S6; S5, when real-time fan current is greater than real-time reference fan current , after the air adding process is performed, return to the fan drive duty ratio wind speed of the current load default , jump to S6; S6. When the user adjusts the temperature or the water flow rate changes the combustion load, jump to S2, otherwise keep the current fan drive duty cycle working.

2. The method according to claim 1, characterized in that: S1 fan drive signal duty cycle operating range for hot water set minimum fan speed and hot water set maximum fan speed fan drive signal duty cycle .

3. The method according to claim 1, characterized in that: The value of N in S1 is in the range of 8-10.

4. The method according to claim 1, characterized in that: S1 fan pressure of the fan provided with the smoke exhaust hole and satisfies .

5. The method of claim 1, wherein the method further comprises: determining a current wind pressure of the gas water heater; and determining a current wind volume of the gas water heater. S1 fan pressure of the fan provided with the smoke exhaust hole and satisfies .

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