TWI558960B - Adjustment method of air exhaust rate of water heater - Google Patents

Description

Method for adjusting the exhaust air volume of a water heater

The invention relates to a method for adjusting the exhaust air volume of a water heater, in particular to a method for adjusting the air exhaust volume of a water heater according to the length of the exhaust pipe and the operating power to adjust the fan speed.

For the convenience of life, almost every household in today's society is equipped with water heaters, among which gas water heaters are the most popular. The basic working principle of the gas water heater is to make the water flow into the water heater, push the water tray and touch the relevant mechanism to ignite, at the same time open the valve to burn the gas to heat the water flow, and finally output the water flow with the desired temperature. Although the gas water heater allows the user to conveniently use the hot water, since the gas water heater heats the water flow by burning the fuel, the gas water heater needs a perfect exhaust mechanism to maintain the combustion efficiency and prevent the carbon monoxide generated by the combustion process from harming the user. .

However, as the location of the water heater is different, the environment in which the water heater is located will affect the length of the exhaust pipe and affect the amount of exhaust air. However, current water heaters are not able to adjust the amount of exhaust air as the environment changes, thereby causing carbon monoxide to harm the user or may affect the combustion efficiency of the water heater.

In view of the above, the present invention aims to disclose a method for adjusting the exhaust air volume of a water heater to overcome the safety problem of the water heater affected by the installation environment mentioned above, or to consider its combustion efficiency.

The method for adjusting the exhaust air volume of the water heater disclosed by the invention comprises the first operation of the water heater exhaust fan. Then, the exhaust fan of the water heater is driven to rotate by a preset voltage. After the preset time has elapsed, measure the actual speed value of the exhaust fan. Then, according to the relative magnitude of the actual speed value and the standard speed value, the tube length setting value is determined correspondingly. Finally, when the water heater performs the heating operation, the rotation speed of the exhaust fan is controlled according to the set value of the pipe length and the operating power value of the water heater.

In summary, the present invention discloses a method for adjusting the exhaust air volume of a water heater, wherein the method for adjusting the exhaust air volume of the water heater adjusts the fan speed in the water heater according to the environment, thereby adjusting the exhaust air volume. Thereby, the water heater can be adapted to various environments so that the user can safely use the water heater, or the combustion efficiency can be balanced.

The above description of the present invention and the following description of the embodiments are intended to illustrate and clarify the spirit and principles of the invention, and to provide further explanation of the scope of the invention.

S101~S109‧‧‧ Method flow

G _{1, config1} , G _{2, config1} , G _{1, config2} , G _{2, config2 ‧ ‧ watt} output

V _{1_default} , V _{2_default} ‧‧‧ rpm

V _{1_config1} , V _{2_config1} , V _{1_config2} , V _{2_config2} ‧‧‧

W ₁ , W ₂ ‧‧‧ power

1 is a schematic flow chart of a method for adjusting an air discharge amount of a water heater according to an embodiment of the present invention.

Figure 2 is a diagram showing the steps of adjusting the air discharge amount of the water heater according to an embodiment of the present invention. Schematic diagram of the detailed method flow of S107.

The detailed features of the present invention are described in the following description, which is sufficient for any skilled person to understand the technical contents of the present invention and to implement it, and according to the contents disclosed in the specification, the patent application scope and the drawings, any familiarity The related objects and advantages of the present invention will be readily understood by those skilled in the art. The following examples are intended to further illustrate the invention, but are not intended to limit the scope of the invention.

It should be noted that the drawings of the embodiments of the present invention are simplified schematic diagrams, and only the basic structure of the present invention is illustrated in a schematic manner. Therefore, the components shown are not drawn in the actual number, shape, size ratio, etc., and the actual size of the implementation is a selective design, and the component layout may be more complicated. Bright.

In practice, in order to facilitate the process, the water heater is usually set with the preset pipe length to simulate the fan speed before leaving the factory. However, the actual length of the exhaust pipe of the water heater will vary depending on the actual installation location of the water heater. Due to the difference between the actual tube length and the preset tube length, the setting of the rotational speed of the fan is not optimal for the actual situation, thus causing problems as in the prior art.

Further, ideally, when the water heater drives the exhaust fan at one end of the exhaust pipe of a preset length with a fixed standard voltage, the exhaust fan is configured to have an exhaust pipe corresponding to the standard voltage and the preset length And a standard turn Rotate at a speed. However, according to the well-known fluid mechanics, when the length of the exhaust pipe is different, the exhaust fan will affect the actual output speed due to the difference in fluid resistance.

More precisely, when the actual length of the exhaust duct is longer than the preset length, the actual speed will be faster than the standard speed; conversely, when the actual length of the exhaust duct is shorter than the preset length, the actual speed is Will be slower than the standard speed.

Therefore, the present invention discloses a method for adjusting the exhaust air volume of a water heater, which is suitable for a water heater having an exhaust pipe. Please refer to FIG. 1 for assistance in explanation. FIG. 1 is a schematic flow chart of a method for adjusting the exhaust air volume of a water heater according to an embodiment of the present invention. The method for adjusting the exhaust air volume of the water heater comprises: first operating the water heater exhaust fan (step S101). The exhaust fan of the water heater is then driven to rotate by a predetermined voltage (step S103). After a predetermined period of time has elapsed, the actual rotational speed value of the exhaust fan is measured (step S105). Then, based on the relative magnitude of the actual rotational speed value and the standard rotational speed value, the tube length set value is determined (step S107). Finally, when the water heater performs the heating operation, the rotation speed of the exhaust fan and the gas output of the water heater are controlled according to the pipe length setting value and the operating power value of the water heater (step S109).

Continuing the foregoing and still further, in step S101, when the water heater stops heating operation, the inside of the water heater stops burning the gas, and the gas product generated by the combustion is stopped to be exhausted into the exhaust pipe for subsequent calibration test. Can be more accurate. The gaseous product is, for example, carbon monoxide or carbon dioxide.

In step S103, the preset voltage can be, for example, 10 to 30 volts. The purpose of this step is to measure the true rotational speed of the fan when it is driven by a preset voltage.

In step S105, the preset time may be 5 to 20 seconds, and the purpose is In order to ensure the measured actual fan speed, it is obtained under the condition that the fan is in steady state operation to avoid too much measurement error.

In step S107, ideally, the exhaust pipe of the water heater has a preset pipe length value and drives the exhaust fan with the preset voltage, and the exhaust fan rotates at a standard rotation speed, and the preset pipe length value is, for example, 2.5 to 3.5 meters and the standard rotation speed. For example, it is 1000~3000 revolutions per minute (1000~3000 revolution per minute, 1000~3000rpm). However, when the actual pipe length of the exhaust pipe is different from the preset pipe length, the actual speed of the exhaust fan may deviate from the standard speed due to the actual pipe length of the exhaust pipe. Compared to the standard speed value corresponding to the preset tube length value, the actual speed at this time will correspond to the actual tube length value. The purpose of step S107 is to compensate the preset tube length value by a tube length compensation value according to the difference between the actual speed and the standard speed according to the corresponding relationship between the respective speed values and the length values of the tubes, so as to obtain the length of the tube that is close to the actual length of the tube. The set value, the tube length compensation value is, for example, 1 to 3 meters. The method of obtaining the pipe length setting value in detail is as follows.

Referring to FIG. 2, FIG. 2 is a schematic flow chart showing the detailed method of step S107 of the method for adjusting the air discharge amount of the water heater according to an embodiment of the present invention. In one embodiment, the standard speed value corresponds to a preset tube length value, and step S107 further includes determining whether the actual speed value is greater than a standard speed value of the first error rate (step S1071). When the actual rotational speed value is greater than the standard rotational speed value of the first error magnification, the pipe length setting value is set to the preset pipe length value plus the pipe length compensation value (step S1073). If not, it is judged whether or not the actual rotational speed value is smaller than the standard rotational speed value of the second error magnification (step S1075). When the actual rotational speed value is less than the standard rotational speed value of the second error magnification, the pipe length setting value is the preset pipe length value minus the pipe length compensation value (step S1077). If again No, that is, when the actual rotational speed value is less than the standard rotational speed value of the first error magnification and greater than the standard rotational speed value of the second error magnification, the pipe length set value is equal to the preset pipe length value (step S1079). The first error magnification may be, for example, 1 to 1.1 times, and the second error magnification may be, for example, 1 to 0.9 times.

Here, a practical example will be described in detail in step S107 how to determine the pipe length setting value. In this example, the preset length of the water heater exhaust pipe is 3 meters, and the pipe length compensation value is 2 meters. The standard speed corresponding to the exhaust fan driven by a voltage of 20 volts should be 2,000 rpm, and the first error rate is set to be positive five percent, and the second error magnification is set to negative five percent. Therefore, the standard rotational speed of the first error magnification is 2100 rpm, and the standard rotational speed of the second error magnification is 1900 rpm.

Continuing the previous example, in step S107, the water heater equivalently sets the pipe length setting value based on the relative relationship between the measured rotational speed value and the standard rotational speed range. When the water heater measures that the exhaust fan speed is greater than the standard speed value of the first error rate (ie, 2100 rpm), the set pipe length setting value is 5 meters, that is, the preset pipe length value (ie, 3 meters) plus the pipe length. Compensation value (ie 2 meters). When the water heater measures that the exhaust fan speed is less than the standard speed value of the second error rate (ie, 1900 rpm), the set pipe length setting value is 1 meter, that is, the preset pipe length value (3 meters) minus the pipe length. Compensation value (2 meters). When the water heater measures that the exhaust fan speed is less than the standard speed value of the first error rate (ie, 2100 rpm) and is greater than the standard speed value of the second error rate (ie, 1900 rpm), the pipe length setting value is set. It is 3 meters, that is, the set pipe length setting value is equal to the preset pipe length value (3 meters).

Next, in step S109, the rotational speed and the gas output of the exhaust fan are mainly controlled according to the set value of the tube length determined in step S107, so as to avoid environmental factors affecting the safety of the water heater, and at the same time taking into account the combustion efficiency of the water heater. The operating power value mentioned in the step S109 is obtained, for example, by the displacement of the water heater and the heating range. In other words, the operating power value is related to the displacement and heating range of the water heater. The details are freely designed by those having ordinary skill in the art, and are not limited thereto.

For example, different pipe length settings will correspond to a set of power-speed lookup tables. If the water heater determines in step S107 that the pipe length setting value is the preset pipe length value (3 meters), the preset power-speed search table corresponding to the operating power set by the user and the pipe length setting value of 3 meters is The preset power-gas output lookup table is used to find the corresponding exhaust fan speed and gas output. In terms of the exhaust fan speed, when the user sets the water heater to be heated by the power W ₁ , the water heater rotates the exhaust fan at the speed V _{1_default} according to the preset power-speed search table; when the user sets the water heater to heat with the power W ₂ , the water heater is also the same According to the preset power-speed search table, the exhaust fan is rotated at the speed V _{2_default} , and the rest can be _deduced . Wherein, the power W _{1 is} greater than the power W ₂ , so the speed V _{1_default is} faster than the speed V _{2_default} . In terms of gas output, when the user sets the water heater to be heated by the power W ₁ , the water heater sets the output gas output G _{1 default} according to the preset power-gas output amount lookup table; when the user sets the water heater to the power W _{2 When} heating, the water heater also sets the output gas output G _{2, default} according to the preset power-gas output amount lookup table _, and the rest can be deduced by analogy.

In the same embodiment, when the water heater setting pipe length setting value is the preset pipe length value (3 meters) minus the pipe length compensation value (2 meters), the operating power and the pipe length setting value according to the user are 1 public. The first power-speed lookup table corresponding to the ruler and the first power-gas output amount lookup table are used to find the corresponding exhaust fan speed and gas output. In terms of the exhaust fan speed, when the user sets the water heater to be heated by the power W ₁ , the water heater rotates the exhaust fan at the speed V _{1, config1} according to the first power-speed search table; when the user sets the water heater to heat with the power W ₂ , The water heater also rotates the exhaust fan at the speed V _{2, config1} according to the first power-speed search table, and the rest can be deduced. Wherein, the power W _{1 is} greater than the power W ₂ , so the speed V _{1, config1 is} faster than the speed V _{2, config1} . In terms of gas output, when the user sets the water heater to be heated by the power W ₁ , the water heater sets the output gas output G _{1, config1} according to the first power-gas output lookup table; when the user sets the water heater to the power W _{2 When} heating, the water heater also sets the output gas output G _{2 , config1} according to the first power-gas output amount lookup table _, and the rest can be deduced by analogy.

In the same embodiment, when the water heater setting pipe length setting value is a preset pipe length value (3 meters) plus a pipe length compensation value (2 meters), the operating power and the pipe length setting value according to the user are 5 The second power-speed lookup table and the second power-gas output lookup table corresponding to the ruler are used to find the corresponding exhaust fan speed and gas output. In terms of the exhaust fan speed, when the user sets the water heater to be heated by the power W ₁ , the water heater rotates the exhaust fan at the speed V _{1, config2} according to the second power-speed search table; when the user sets the water heater to be heated by the power W ₂ , The water heater also rotates the exhaust fan at the speed V _{2, config2} according to the second power-speed search table, and the rest can be _deduced . Wherein, the power W _{1 is} greater than the power W ₂ , so the speed V _{1, config2 is} faster than the speed V _{2, config2} . In terms of gas output, when the user sets the water heater to be heated by the power W ₁ , the water heater sets the output gas output G _{1, config2} according to the second power-gas output lookup table; when the user sets the water heater to the power W _{2 When} heating, the water heater also sets the output gas output G _{2, config2} according to the second power-gas output amount lookup table _, and the rest can be _deduced by analogy.

In this embodiment, a lookup table (LUT) is taken as an example, and the lookup table method can also be implemented by a micro control unit (MCU), but not limited thereto. . The embodiment is not intended to limit the method for adjusting the exhaust air volume of the water heater of the present invention, but only one of them is exemplified. That is, it is within the scope of the present invention to control the rotation speed of the water heater fan and the method of adjusting the gas output according to the set value of the pipe length and the operating power of the water heater. It is to be understood by those skilled in the art that the values of the parameters used in the foregoing embodiments are merely exemplary and not limited thereto.

In summary, the present invention discloses a method for adjusting the air volume of a water heater. The method for adjusting the air volume of the water heater is to determine a pipe length setting value by detecting the actual speed value of the fan, and setting the value according to the pipe length and the water heater. The operating power adjusts the fan speed in the water heater to adjust the exhaust air volume. Adjusting the exhaust air volume can improve the safety of the water heater and the combustion efficiency. The combustion efficiency is not only affected by the exhaust air volume, but also related to the gas output. Therefore, the present invention can adjust the gas output according to the pipe length setting value and the operating power of the water heater. By doing fine tuning to improve combustion efficiency. By the above method, the invention enables the water heater to adapt to various environments The user can safely use the water heater, but also the combustion efficiency.

Although the present invention has been disclosed above in the foregoing embodiments, it is not intended to limit the invention. It is within the scope of the invention to be modified and modified without departing from the spirit and scope of the invention.

Claims (10)

The invention relates to a water heater air volume adjusting method, which is suitable for a water heater having an exhaust pipe, wherein the water heater exhaust air volume adjustment method comprises: causing the water heater exhaust fan to operate; driving a row of fans of the water heater to rotate by a preset voltage; After setting the time, measuring an actual speed value of the exhaust fan; determining a length setting value according to the relative magnitude of the actual speed value and a standard speed value; and setting the value according to the tube length when the water heater performs heating operation The operating power value of the water heater controls the speed of the exhaust fan. The method for adjusting the air discharge amount of the water heater according to claim 1, wherein the one gas output of the water heater is further adjusted according to the pipe length setting value and the operating power value of the water heater. The method for adjusting the exhaust air volume of the water heater according to claim 1, wherein the operating power value is obtained by a displacement of the water heater and a heating range. The method for adjusting the exhaust air volume of the water heater according to claim 1, wherein the step of determining a length of the pipe length corresponding to the relative magnitude of the actual speed value and a standard speed value further comprises: the standard speed value corresponding to a preset The tube length value, when the actual speed value is greater than the standard speed value of the first error rate, the tube length setting value is the preset tube length value plus a tube length compensation value; when the actual speed value is less than a second error rate The standard speed value and When the actual rotational speed value is less than the standard rotational speed value of the first error magnification, the pipe length setting value is the preset pipe length value minus the pipe length compensation value, the second error magnification is less than the first error magnification; and when the actual When the speed value is less than the standard speed value of the first error rate and greater than the standard speed value of the second error rate, the tube length setting value is equal to the preset tube length value. The method for adjusting the air discharge amount of the water heater according to claim 4, wherein the first error magnification is 1 to 1.1 times, and the second error magnification is 1 to 0.9 times. The method for adjusting the air discharge amount of the water heater according to claim 4, wherein the preset pipe length value is 2.5 to 3.5 meters. The method for adjusting the air discharge amount of the water heater according to claim 4, wherein the pipe length compensation value is 1 to 3 meters. The method for adjusting the exhaust air volume of the water heater according to claim 1, wherein the standard speed value is 1000 to 3000 revolutions per minute. The method for adjusting the air discharge amount of the water heater according to claim 1, wherein the preset voltage is 10 to 30 volts. The method for adjusting the air discharge amount of the water heater according to claim 1, wherein the preset time is 5 to 20 seconds.