CN113654246B - Strong pumping gas water heater and air blockage identification method, device and storage medium thereof - Google Patents
Strong pumping gas water heater and air blockage identification method, device and storage medium thereof Download PDFInfo
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- CN113654246B CN113654246B CN202111121182.4A CN202111121182A CN113654246B CN 113654246 B CN113654246 B CN 113654246B CN 202111121182 A CN202111121182 A CN 202111121182A CN 113654246 B CN113654246 B CN 113654246B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
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- F24H9/2007—Arrangement or mounting of control or safety devices for water heaters
- F24H9/2035—Arrangement or mounting of control or safety devices for water heaters using fluid fuel
Abstract
The invention discloses a forced-draft gas water heater, a method and a device for identifying a wind blockage of the gas water heater and a storage medium, wherein the gas water heater comprises a fan and a frequency converter for driving the fan to operate, and the method for identifying the wind blockage comprises the following steps: when a fan is in a running state, if the direct current bus voltage of the frequency converter is determined to be in a stable state, acquiring a first fan current, a second fan current, a first fan rotating speed and a second fan rotating speed, wherein the first fan current is the fan current after filtering, the second fan current is the fan current without filtering, the first fan rotating speed is the fan rotating speed after filtering, and the second fan rotating speed is the fan rotating speed without filtering; according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed, the air blockage state of the gas water heater is determined, therefore, the air blockage state can be effectively identified, and the reliability is high.
Description
Technical Field
The invention relates to the technical field of water heaters, in particular to a strong pumping gas water heater, a method and a device for identifying a wind blockage of the strong pumping gas water heater and a storage medium.
Background
At present, alternating current fans are adopted in a plurality of low-end models of gas water heaters, and for a strong pumping gas water heater adopting the alternating current fans, most of the alternating current fans are used for identifying air blockage by installing a wind pressure switch or a wind pressure sensor at a pressure taking nozzle or identifying the air blockage according to the rotating speed of the alternating current fans, however, the two air blockage identification methods are easy to lose effectiveness and low in reliability.
Disclosure of Invention
The present invention is directed to solving, at least in part, one of the technical problems in the related art. Therefore, the first objective of the present invention is to provide a method for identifying a wind blockage of a strong pumping gas water heater, which can effectively identify the wind blockage state and has high reliability.
A second object of the invention is to propose a computer-readable storage medium.
The third purpose of the invention is to provide a strong pumping gas water heater.
The fourth purpose of the invention is to provide a wind blockage recognition device of the strong pumping gas water heater.
In order to achieve the above object, an embodiment of a first aspect of the present invention provides a method for identifying a wind blockage of a strong pumping gas water heater, where the gas water heater includes a fan and a frequency converter for driving the fan to operate, and the method for identifying a wind blockage includes: when a fan is in a running state, if the direct current bus voltage of the frequency converter is determined to be in a stable state, acquiring a first fan current, a second fan current, a first fan rotating speed and a second fan rotating speed, wherein the first fan current is the fan current after filtering, the second fan current is the fan current without filtering, the first fan rotating speed is the fan rotating speed after filtering, and the second fan rotating speed is the fan rotating speed without filtering; and determining the air blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed.
According to the method for identifying the wind blockage of the strong pumping gas water heater, when the fan is in the running state, if the direct current bus voltage of the frequency converter is determined to be in the stable state, the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed are obtained, the first fan current is the fan current which is subjected to filtering processing, the second fan current is the fan current which is not subjected to filtering processing, the first fan rotating speed is the fan rotating speed which is subjected to filtering processing, the second fan rotating speed is the fan rotating speed which is not subjected to filtering processing, and the wind blockage state of the gas water heater is determined according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed. Therefore, the wind blockage state can be effectively identified, and the reliability is high.
According to one embodiment of the invention, determining the wind blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed comprises the following steps: if the first fan current is smaller than a first current threshold value and lasts for a first preset time, or the first fan rotating speed is larger than a first rotating speed threshold value and lasts for a first preset time, determining that the wind blockage state is a slow blockage state; if the descending amount of the current of the second fan in the second preset time is smaller than a second current threshold value, or the ascending amount of the rotating speed of the second fan in the second preset time is larger than a second rotating speed threshold value, determining that the wind blockage state is a fast blockage state; and if the descending amount of the second fan current in the second preset time is greater than or equal to a second current threshold value, and the ascending amount of the second fan rotating speed in the second preset time is less than or equal to a second rotating speed threshold value, determining that the air blocking state is a quick blocking state when the second fan current is less than a third current threshold value and lasts for a third preset time, or the second fan rotating speed is greater than a third rotating speed threshold value and lasts for a third preset time.
According to one embodiment of the invention, when a fan is in an operating state, a first direct current bus voltage and a second direct current bus voltage of a frequency converter are obtained, wherein the first direct current bus voltage is the direct current bus voltage subjected to filtering processing for a first preset time length, the second direct current bus voltage is the direct current bus voltage subjected to filtering processing for a second preset time length, and the first preset time length is longer than the second preset time length; and determining the current state of the direct-current bus voltage of the frequency converter according to the first direct-current bus voltage and the second direct-current bus voltage.
According to one embodiment of the invention, determining the current state of the direct current bus voltage of the frequency converter according to the first direct current bus voltage and the second direct current bus voltage comprises the following steps: if the first direct current bus voltage is smaller than the first voltage threshold and the second direct current bus voltage is smaller than the second voltage threshold, determining that the direct current bus voltage is in a stable state; and if the first direct current bus voltage is greater than or equal to the first voltage threshold value or the second direct current bus voltage is greater than or equal to the second voltage threshold value, determining that the direct current bus voltage is in an unstable state.
According to an embodiment of the present invention, when it is determined that the dc bus voltage is in an unstable state, the method for identifying a wind blockage further includes: and if the current of the first fan is smaller than the fourth current threshold value or the rotating speed of the first fan is larger than the fourth rotating speed threshold value, determining that the wind blockage state is a slow blockage state.
According to an embodiment of the present invention, the method for identifying a wind blockage further comprises: acquiring the heat load of the gas water heater; acquiring the pressure-frequency ratio of the fan according to the heat load; and controlling the fan to operate according to the voltage-frequency ratio, and acquiring a first current threshold, a first rotating speed threshold, a second current threshold, a second rotating speed threshold, a third current threshold and a third rotating speed threshold corresponding to the voltage-frequency ratio.
According to an embodiment of the present invention, the method for identifying a wind blockage further comprises: when the fan is in a standby state, acquiring a first fan current; and if the first fan current is greater than or equal to the fifth current threshold and lasts for a fourth preset time, determining that the fan is in fault.
In order to achieve the above object, a second embodiment of the present invention provides a computer-readable storage medium, on which a computer program is stored, where the computer program, when executed by a processor, implements the method for identifying a wind blockage of a strong pumping gas water heater.
According to the computer-readable storage medium of the embodiment of the invention, the wind blockage identification method of the strong extraction gas water heater is realized by storing the computer program on the computer-readable storage medium, when the computer program is executed by the processor, the wind blockage state can be effectively identified, and the reliability is high.
In order to achieve the above object, a third aspect of the present invention provides a strong extraction gas water heater, which includes a memory, a processor, and a computer program stored in the memory and executable on the processor, and when the processor executes the computer program, the method for identifying a wind blockage of the strong extraction gas water heater is implemented.
According to the strong pumping gas water heater provided by the embodiment of the invention, the processor executes the program by comprising the memory, the processor and the computer program which is stored on the memory and can run on the processor, so that the wind blockage identification method of the strong pumping gas water heater is realized, the wind blockage state can be effectively identified, and the reliability is high.
In order to achieve the above object, a fourth aspect of the present invention provides a wind blockage recognition device for a strong pumping gas water heater, where the gas water heater includes a fan and a frequency converter for driving the fan to operate, and the wind blockage recognition device includes: the acquisition module is used for acquiring a first fan current, a second fan current, a first fan rotating speed and a second fan rotating speed if the direct-current bus voltage of the frequency converter is in a stable state when the fan is in a running state, wherein the first fan current is the filtered fan current, the second fan current is the unfiltered fan current, the first fan rotating speed is the filtered fan rotating speed, and the second fan rotating speed is the unfiltered fan rotating speed; and the identification module is used for determining the air blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed.
According to the wind blockage recognition device of the strong pumping gas water heater, when the fan is in an operating state, if the direct current bus voltage of the frequency converter is in a stable state, the obtaining module is used for obtaining the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed, wherein the first fan current is the fan current subjected to filtering processing, the second fan current is the fan current not subjected to filtering processing, the first fan rotating speed is the fan rotating speed subjected to filtering processing, the second fan rotating speed is the fan rotating speed not subjected to filtering processing, and the recognition module is used for determining the wind blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed. Therefore, the wind blockage state can be effectively identified, and the reliability is high.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a flow chart of a method for identifying a wind blockage of a strong draft gas water heater according to an embodiment of the invention;
FIG. 2 is a schematic diagram of a high intensity extraction gas water heater according to one embodiment of the present invention;
FIG. 3 is a flow chart of a method of identifying a windage blockage in a strong extraction gas water heater according to another embodiment of the invention;
FIG. 4 is a block diagram of a strong extraction gas water heater according to one embodiment of the present invention;
fig. 5 is a block diagram of a wind blockage recognition device of a strong draft gas water heater according to an embodiment of the invention.
Detailed Description
The invention is described in detail below by way of embodiments, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar elements or elements having the same or similar function throughout.
The following describes a strong pumping gas water heater, a method and a device for identifying a wind blockage thereof, and a storage medium, which are provided by the embodiment of the invention, with reference to the accompanying drawings.
It should be noted that, the current gas water heater mostly adopts a constant speed fan or a double speed fan, and in order to identify the wind blockage state, two measures are usually taken: one method is to identify wind blockage through a wind pressure sensor or a wind pressure switch, but in the long-term corrosion and oxidation process, the wind pressure sensor or the wind pressure switch is easy to lose effectiveness and affect the reliability, thereby directly causing the increase of after-sale service cost and further affecting the public praise and user experience of products; the other method is to detect the rotating speed of the fan through a Hall sensor so as to identify the state of the wind blockage, however, when the scheme is adopted, the rotating speed of the fan before and after the wind blockage is not changed greatly, so that misjudgment is easily caused, the reliability is influenced, and the safety detection standard of some countries cannot be met.
Based on the method, the method for identifying the air blockage of the forced draft gas water heater can effectively identify the air blockage state of the forced draft gas water heater, and is high in reliability.
Fig. 1 is a flowchart of a method for identifying a wind blockage according to an embodiment of the present invention, in which a gas water heater includes a fan and a frequency converter, the fan is driven by the frequency converter to operate, and referring to fig. 1, the method for identifying a wind blockage of a strong pumping gas water heater may include the following steps:
step S101: when the fan is in a running state and the direct current bus voltage of the frequency converter is in a stable state, the current of the first fan and the current of the second fan and the rotating speed of the first fan and the rotating speed of the second fan are obtained. After filtering processing, acquiring a relatively stable fan current in real time as a first fan current, and acquiring a relatively stable fan rotating speed in real time as a first fan rotating speed; and when the filtering processing is not performed, the fan current acquired in real time is the second fan current, and the fan rotating speed acquired in real time is the second fan rotating speed.
Specifically, the operating state of the wind turbine may include an operating state and a standby state, and the state of the dc bus voltage includes a steady state and an unsteady state. When the wind blockage occurs, the fan rotating speed and the motor current can change, the fan rotating speed and the motor current are parameters related to the wind blockage state, and certain influence is given to the two parameters by considering the filtering processing, so that when the direct-current bus voltage is in a stable state and the fan is in a running state, the fan currents after the filtering processing and without the filtering processing, namely the first fan current and the second fan current, are respectively obtained, the fan rotating speeds after the filtering processing and without the filtering processing, namely the first fan rotating speed and the second fan rotating speed, are obtained, and a wind blockage identification strategy is formulated through the parameters.
It should be noted that, in the present application, an amplitude-adjustable frequency-adjustable control mode may be adopted to adjust the speed of the ac fan, fig. 2 is a schematic structural diagram of the strong pumping gas water heater according to an embodiment of the present invention, and as shown in fig. 2, the strong pumping gas water heater may include a frequency converter, a fan unit 210, a main control unit 220, an ignition module 230, a flame induction module 240, an air valve module 250, and a zero-cold-water pump 260.
The frequency converter comprises an alternating current frequency conversion control unit 201, a rectification module 202 and a power module 203, wherein the alternating current frequency conversion control unit 201 is in serial communication connection with a main control unit 220, the alternating current frequency conversion control unit 201 receives voltage and frequency instructions sent by the main control unit 220 through serial communication, the rotating speed of the fan can be adjusted in a stepless mode within a wider range by adjusting a voltage-frequency ratio (the ratio of the voltage to the frequency), the rectification module 202 is used for converting alternating current into direct current, and a power switch in the power module 203 can convert the direct current into alternating current voltage. Specifically, the ac frequency conversion control unit 201 includes a bus voltage acquisition module 2011 and a fan current acquisition module 2012, wherein the bus voltage acquisition module 2011 is electrically connected to the rectifier module 202, and is configured to acquire a dc bus voltage, and output an acquisition signal to the ac frequency conversion control unit 201, and then transmit the acquisition signal to the main control unit 220, and determine whether it is in a stable state according to a magnitude of the dc bus voltage, and the fan current acquisition module 2012 is electrically connected to the power module 203, and is configured to acquire a fan current, and output the acquisition signal to the ac frequency conversion control unit 201, and then transmit the acquisition signal to the main control unit 220, so as to identify a wind blockage state through the fan current. The fan part 210 comprises an alternating current motor fan M and a hall detection module 2101, wherein the hall detection module 2101 is used for detecting the rotating speed of the fan and outputting a signal to the main control unit 220 so as to identify the wind blockage state according to the rotating speed of the fan.
In addition, the ignition module 230, the flame sensing module 240, the zero-cold-water pump 260 and the air valve module 250 in the strong pumping gas water heater are respectively electrically connected with the main control module 220 (the main control module may include a proportional valve) to respectively realize the corresponding functions of ignition, flame sensing, zero-cold-water delivery and air valve opening and closing under the control of the main control module 220, and details are not repeated here.
Step S102: and determining the air blockage state of the gas water heater according to the currents of the first fan and the second fan and the rotating speeds of the first fan and the second fan.
Particularly, because the strong pumping gas water heater of this application adopts the converter to carry out fan rotational speed control, consequently utilize the characteristic that frequency conversion control's anti-wind pressure is high, when the fan takes place the wind blockage phenomenon, the fan rotational speed after the wind blockage can differ great with the fan rotational speed before the wind blockage, the fan current after the wind blockage also can differ great with the fan current before the wind blockage, consequently both can discern the wind blockage according to the fan rotational speed before and after the wind blockage, also can discern the wind blockage according to the fan current before and after the wind blockage. Table 1 shows the test results of the strong pumping gas water heater according to an embodiment of the present invention when the fan operates at a corresponding pressure-frequency ratio under a certain thermal load.
TABLE 1
As can be seen from Table 1, when different supply voltages (195V, 205V, 220V, 230V, 245V and 265V) are adopted, the fan rotating speed is basically stabilized at 1450 +/-30 RPM in a wind blockage-free state, and the fan rotating speed is increased to 2185 +/-30 RPM in a wind blockage state, and meanwhile, the reduction amplitude of the fan current is higher than 1mA. That is to say, to different supply voltage, the stifled state of wind can direct influence fan rotational speed and fan current, consequently can effectively discern the stifled state of strong induced draft through fan rotational speed and fan current. And this application judges the wind of fan stifled condition through fan electric current and fan rotational speed two jointly, realizes dual guarantee, can effectively improve the reliability of wind stifled discernment.
In addition, because the filtering has certain influence on the fan current and the fan rotating speed, namely the fan current is different under the two conditions of being filtered and not being filtered, and the fan rotating speed is different, the wind blockage state is determined according to the fan current and the fan rotating speed which are not filtered and are filtered, and the reliability of wind blockage identification can be further improved.
The utility model has the advantages of it is obvious that on the one hand because compare before the wind blockage with, the fan rotational speed behind the wind blockage risees rapidly, and motor current reduces, on the other hand considers the influence of filtering to fan current and fan rotational speed, but this application adopts amplitude modulation frequency modulation's speed governing control mode to the alternating current fan, under the fan is in running state and the stable condition of direct current busbar voltage, acquire fan current and fan rotational speed behind the filtering processing respectively not, and according to fan current and the fan rotational speed before and after the filtering, judge the wind blockage state, can effectively discern the wind blockage state, and the reliability is high.
In one embodiment, if the first fan current is continuously smaller than the first current threshold value or the first fan rotating speed is continuously larger than the first rotating speed threshold value within a first preset time, the state is judged to be a slow blockage state; if the descending amount of the current of the second fan is smaller than a second current threshold value or the ascending amount of the rotating speed of the second fan is larger than a second rotating speed threshold value within second preset time, judging that the state is a fast blocking state; if the descending amount of the second fan current in the second preset time is greater than or equal to the second current threshold value, and the ascending amount of the second fan rotating speed in the second preset time is less than or equal to the second rotating speed threshold value, when the second fan current is continuously less than the third current threshold value in the third preset time, or the second fan rotating speed is continuously greater than the third rotating speed threshold value in the third preset time, it is determined that the state is a fast plugging state.
Specifically, the wind blockage state can be divided into a slow wind blockage state (slow blockage state for short) and a fast wind blockage state (fast blockage state for short). The identification of the slow blocking state can adopt the following two modes: in a first preset time, if the filtered fan current is continuously smaller than a first current threshold, judging that the fan current is in a slow blocking state; and if the rotating speed of the filtered fan is continuously greater than the first rotating speed threshold value, the state is also judged to be a slow blockage state.
The identification of the fast blocking state can adopt the following modes: firstly, in a second preset time, if the reduction of the unfiltered fan current is smaller than a second current threshold, judging that the fan current is in a fast plugging state; and if the rising amount of the rotating speed of the unfiltered fan is larger than the second rotating speed threshold value, the state of quick blockage is also judged. Secondly, in a second preset time, under the condition that the descending amount of the unfiltered fan current is larger than or equal to a second current threshold value and the ascending amount of the unfiltered fan rotating speed is smaller than or equal to a second rotating speed threshold value, in a third preset time, if the unfiltered fan current is continuously smaller than a third current threshold value, the wind blockage state is judged to be a fast blockage state, and if the unfiltered fan rotating speed is continuously larger than the third rotating speed threshold value, the wind blockage state is also judged to be the fast blockage state.
It should be noted that, in the related art, for the strong pumping gas water heater using the constant-speed or double-speed fan, no matter the wind blockage identification scheme using the wind pressure sensor or the wind pressure switch or the wind blockage identification scheme using the hall detection is adopted, in the fast blockage state, the situation of flame overflow occurs, which makes it an industrial difficult problem of the alternating current fan strong pumping type. In contrast, if a variable frequency control mode is adopted for the alternating-current fan forced-draft fan type and the air blockage identification method in the embodiment is adopted, not only can slow air blockage and fast air blockage be effectively identified, but also the problem of flame overflow during fast air blockage can be solved.
Further, the method for identifying the wind blockage further comprises the following steps: acquiring the heat load of the gas water heater; acquiring a pressure-frequency ratio of the fan according to the heat load; and controlling the fan to operate according to the voltage-frequency ratio, and acquiring a first current threshold, a first rotating speed threshold, a second current threshold, a second rotating speed threshold, a third current threshold and a third rotating speed threshold corresponding to the voltage-frequency ratio.
That is to say, before the wind blockage identification in the above embodiment is performed, the heat load (i.e. the product of the fuel consumption of the gas water heater and the low fuel heat value) may be obtained, then the pressure-frequency ratio is obtained according to the heat load, so as to control the fan to start and operate according to the pressure-frequency ratio, and the corresponding first current threshold, first rotation speed threshold, second current threshold, second rotation speed threshold, third current threshold and third rotation speed threshold are obtained according to the pressure-frequency ratio, so as to determine whether the wind blockage state is the slow blockage state or the fast blockage state according to the series of thresholds, so as to further improve the accuracy of the determination.
In one embodiment, when the fan operates, a first direct current bus voltage and a second direct current bus voltage of the frequency converter are obtained, wherein the first direct current bus voltage and the second direct current bus voltage are direct current bus voltages filtered by a first preset time length and a second preset time length respectively, and the first preset time length is longer than the second preset time length; and determining the state of the direct current bus voltage according to the first direct current bus voltage and the second direct current bus voltage.
Particularly, the stability of the direct current bus voltage can influence the current and the rotating speed of the fan, so that the identification of the wind blockage state can be influenced. In a specific example, when the fan runs, the direct current bus voltage after the filtering processing of the frequency converter for the first preset time duration, namely the first direct current bus voltage, and the direct current bus voltage after the filtering processing of the second preset time duration (the second preset time duration is less than the first preset time duration), namely the second direct current bus voltage after the filtering processing of the shorter time duration, are obtained, then the current state of the direct current bus voltage is determined according to the direct current bus voltages after the filtering processing of the longer time duration and the filtering processing of the shorter time duration respectively, so that different air blockage identification strategies are adopted according to different states, and therefore the reliability of air blockage identification is further improved.
Optionally, if the second dc bus voltage is less than the second voltage threshold and the first dc bus voltage is less than the first voltage threshold, determining that the dc bus voltage is in a stable state; and if the first direct current bus voltage is greater than or equal to the first voltage threshold value, or the second direct current bus voltage is greater than or equal to the second voltage threshold value, judging that the direct current bus voltage is in an unstable state.
That is to say, the stable state of the dc bus voltage may include a stable state and an unstable state, and when the dc bus voltage after the longer filtering (i.e. the first dc bus voltage) is smaller than the first voltage threshold and the dc bus voltage after the shorter filtering (i.e. the second dc bus voltage) is smaller than the second voltage threshold, it is determined that the dc bus voltage is in the stable state. On the contrary, when the first direct current bus voltage is larger than or equal to the first voltage threshold, the direct current bus voltage is judged to be in an unstable state; and when the second direct current bus voltage is greater than or equal to the second voltage threshold value, judging that the direct current bus voltage is in an unstable state.
Further, when it is determined that the dc bus voltage is in an unstable state, if the first fan current is less than a fourth current threshold, or the first fan rotation speed is greater than a fourth rotation speed threshold, it is determined that the state is a slow blocking state.
Specifically, when the dc bus voltage is in an unstable state, if the filtered fan current is smaller than a fourth current threshold, the slow blocking state is determined, and if the filtered fan speed is greater than the fourth speed threshold, the slow blocking state is also determined. In a specific example, the fourth current threshold is smaller than the first current threshold (in a specific example, the fourth current threshold may be 5mA smaller than the first current threshold), and the fourth rotation speed threshold is greater than the first rotation speed threshold (in a specific example, the fourth rotation speed threshold may be 50RPM greater than the first rotation speed threshold), so that a more reasonable strategy is adopted for a situation where the dc bus voltage is unstable, and thus the reliability of the wind blockage identification method can be further improved.
In one embodiment, the method for identifying a wind blockage further includes: when the fan is in a standby state, acquiring first fan current; if the first fan current is continuously greater than or equal to the fifth current threshold value within the fourth preset time, the fan fault is judged.
That is to say, when the fan is not in the operating state but in the standby state, the filtered fan current is obtained, and if the fan current is continuously greater than or equal to the fifth current threshold value within the fourth preset time, it is determined that the fan has a fault. It is to be understood that the above fault checking step may be fixedly disposed before the plug identification step as a check, or may be disposed during the plug identification step or after the plug identification step, which is not limited herein.
The invention is further illustrated and described below by means of a specific example. Fig. 3 is a flowchart of a method for identifying a wind blockage according to the embodiment, and referring to fig. 3, the method for identifying a wind blockage may include the following steps:
step S301: when the fan is in standby, acquiring a first fan current I 1 Then judging the first fan current I 1 Whether the current value is continuously greater than or equal to a fifth current threshold value I within a fourth preset time d seconds 50 If yes, determining that the fan is in fault, otherwise, executing the step S302.
Step S302: and (4) whether the fan is required to be started or not, if so, executing the step S303, and if not, keeping the standby state.
Step S303: and acquiring a pressure-frequency ratio according to the heat load, and starting the fan to operate according to the pressure-frequency ratio.
Step S304: real-time detection of DC bus voltage V and first fan current I 1 First fan speed S 1 Second fan current I 2 And a second fan speed S 2 Storing in corresponding array, collecting data once every 100 ms, adopting first-in first-out mode, continuously collecting for 5 s to form first-in first-out array I [50 ]]、S[50]And V [50 ]]。
Step S305: judging whether the first DC bus voltage V is within 1-5 seconds 1 Less than a first voltage threshold V 10 And the second DC bus voltage V is within < 1 second 2 Less than a second voltage threshold V 20 If yes, the direct current bus voltage is determined to be in a stable state, and if not, the direct current bus voltage is determined to be in an unstable state. When the voltage of the direct current bus is in a stable state, the current I of the first fan is judged 1 Whether the current value is continuously less than the first current threshold value I within the first preset time a seconds 10 Or first fan speed S 1 Whether the speed is continuously greater than a first rotating speed threshold value S within a first preset time a seconds 10 If yes, the slow blocking state is determined, and if not, the step S306 is executed. When the voltage of the direct current bus is in an unstable state, the current I of the first fan is judged 1 Whether or not it is less than the fourth current threshold I 40 (in the specific example, the fourth current threshold I 40 May be greater than the first current threshold I 10 Small 5 mA), or the first fan speed S 1 Whether it is greater than a fourth speed threshold S 40 (in the specific example, the fourth rotational speed threshold S 40 May be greater than a first speed threshold S 10 50RPM greater), if yes, the slow blocking state is determined, and if no, the process returns to step S303.
Step S306: judging whether the current I of the second fan is met 2 The descending amount within the second preset time b seconds is smaller than the second current threshold I 20 Or a second fan speed S 2 During a second predetermined time bThe rising amount is larger than a second rotating speed threshold value S 20 If yes, the fast blockage state is judged, and if not, whether the second fan current I is met or not is judged 2 Continuously less than a third current threshold I within a third preset time of c seconds 30 Or a second fan speed S 2 Continuously greater than a third rotating speed threshold value S within a third preset time c seconds 30 If yes, the fast plugging state is determined, otherwise, step S307 is executed.
Step S307: and judging whether the fan stops running, if so, controlling the fan to be in a standby state, otherwise, returning to the step S303.
It should be understood that although the various steps in the flowcharts of fig. 1 and 3 are shown in order as indicated by the arrows, the steps are not necessarily performed in order as indicated by the arrows. The steps are not limited to being performed in the exact order illustrated and, unless explicitly stated herein, may be performed in other orders. Moreover, at least some of the steps in fig. 1 and 3 may include multiple sub-steps or multiple stages that are not necessarily performed at the same time, but may be performed at different times, and the order of performing the sub-steps or stages is not necessarily sequential, but may be performed in turn or alternately with other steps or at least some of the sub-steps or stages of other steps.
In summary, according to the wind blockage identification method provided by the embodiment of the invention, if the fan is in the operating state and the dc bus voltage is in the stable state, the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed are obtained, and the wind blockage state of the gas water heater is determined according to the four parameters, so that the wind blockage state can be effectively identified, and the reliability is high.
In one embodiment, a computer-readable storage medium is provided, on which a computer program is stored, which when executed by a processor implements the above-described method for recognizing a wind blockage of a strong extraction gas water heater.
According to the computer-readable storage medium of the embodiment of the invention, the wind blockage identification method of the strong pumping gas water heater is realized when the processor executes the computer program stored on the storage medium, the wind blockage state can be effectively identified, and the reliability is high.
Fig. 4 is a block diagram of a strong extraction gas water heater according to an embodiment of the present invention. Referring to fig. 4, the strong gas water heater 400 includes a memory 401, a processor 402 and a computer program, the computer program is stored in the memory 401 and can be executed by the processor 402, and when the processor 402 executes the program, the method for identifying the wind blockage of the strong gas water heater is implemented.
According to the forced-draft gas water heater provided by the embodiment of the invention, the air blockage identification method is realized when the processor executes the program, the air blockage state can be effectively identified, and the reliability is high.
Fig. 5 is a block diagram of a wind blockage recognition device of a strong draft gas water heater according to an embodiment of the invention. Wherein the gas heater includes fan and the converter that is used for driving the fan operation, and wind blockage recognition device 500 includes: an acquisition module 501 and an identification module 502.
The acquiring module 501 is configured to acquire first and second fan currents and first and second fan rotation speeds if the dc bus voltage is in a stable state when the fan is in an operating state, where the first fan current and the first fan rotation speed are respectively the filtered fan current and the filtered fan rotation speed, and the second fan current and the second fan rotation speed are respectively the unfiltered fan current and the unfiltered fan rotation speed; the identification module 502 is used for determining the wind blockage state of the gas water heater according to the four parameters.
In one embodiment, the identifying module 502 is specifically configured to: if the rotating speed of the first fan is continuously greater than a first rotating speed threshold value or the current of the first fan is continuously less than a first current threshold value within a first preset time, judging that the slow blockage state exists; if the rising amount of the rotating speed of the second fan is larger than a second rotating speed threshold value or the falling amount of the current of the second fan is smaller than a second current threshold value within a second preset time, judging that the state is a quick blocking state; if the descending amount of the second fan current in the second preset time is greater than or equal to the second current threshold value, and the ascending amount of the second fan rotating speed in the second preset time is less than or equal to the second rotating speed threshold value, when the second fan current is less than the third current threshold value and lasts for a third preset time, or the second fan rotating speed is greater than the third rotating speed threshold value and lasts for a third preset time, the fast plugging state is determined.
Further, the identification module 502 is further configured to: acquiring a heat load; acquiring a pressure-frequency ratio through thermal load; and controlling the fan to operate according to the voltage-frequency ratio, and acquiring a first current threshold, a first rotating speed threshold, a second current threshold, a second rotating speed threshold, a third current threshold and a third rotating speed threshold corresponding to the voltage-frequency ratio.
In one embodiment, the wind blockage recognition device further includes a voltage status recognition module (not shown), and the voltage status recognition module is configured to: when the fan runs, acquiring first and second direct current bus voltages of the frequency converter, wherein the first direct current bus voltage is the direct current bus voltage subjected to filtering processing with a first preset time length, the second direct current bus voltage is the direct current bus voltage subjected to filtering processing with a second preset time length, and the first preset time length is longer than the second preset time length; and determining the current state of the direct-current bus voltage according to the two direct-current bus voltages.
Optionally, the voltage state identification module is specifically configured to: if the second direct-current bus voltage is smaller than the second voltage threshold and the first direct-current bus voltage is smaller than the first voltage threshold, determining that the direct-current bus voltage is in a stable state; and if the first direct current bus voltage is greater than or equal to the first voltage threshold value or the second direct current bus voltage is greater than or equal to the second voltage threshold value, determining that the direct current bus voltage is in an unstable state.
Further, the identification module 502 is further configured to: and if the first fan current is smaller than the fourth current threshold or the first fan rotating speed is greater than the fourth rotating speed threshold, determining that the air blockage state is a slow blockage state.
In one embodiment, the obtaining module 501 is further configured to: when the fan is in standby, acquiring first fan current; and if the first fan current is continuously greater than or equal to the fifth current threshold value within the fourth preset time, determining that the fan is in fault.
According to the wind blockage recognition device provided by the embodiment of the invention, when the fan runs and the direct-current bus voltage is in a stable state, the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed are obtained through the obtaining module, wherein the first fan current and the first fan rotating speed are respectively the filtered fan current and the filtered fan rotating speed, the second fan current and the second fan rotating speed are respectively the unfiltered fan current and the unfiltered fan rotating speed, and the wind blockage state is determined through the recognition module according to the four parameters, so that the wind blockage state can be effectively recognized, and the reliability is high.
It should be noted that the logic and/or steps represented in the flowcharts or otherwise described herein, such as an ordered listing of executable instructions that can be considered to implement logical functions, can be embodied in any computer-readable medium for use by or in connection with an instruction execution system, apparatus, or device, such as a computer-based system, processor-containing system, or other system that can fetch the instructions from the instruction execution system, apparatus, or device and execute the instructions. For the purposes of this description, a "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transport the program for use by or in connection with the instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of the computer-readable medium would include the following: an electrical connection (electronic device) having one or more wires, a portable computer diskette (magnetic device), a Random Access Memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disc read-only memory (CDROM). Additionally, the computer-readable medium could even be paper or another suitable medium upon which the program is printed, as the program can be electronically captured, via for instance optical scanning of the paper or other medium, then compiled, interpreted or otherwise processed in a suitable manner if necessary, and then stored in a computer memory.
It should be understood that portions of the present invention may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. If implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are well known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
In the description of the specification, reference to the description of "one embodiment," "some embodiments," "an example," "a specific example," or "some examples" or the like means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present invention have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention, and that variations, modifications, substitutions and alterations can be made to the above embodiments by those of ordinary skill in the art within the scope of the present invention.
Claims (9)
1. A method for identifying a wind blockage of a strong pumping gas water heater is characterized in that the gas water heater comprises a fan and a frequency converter for driving the fan to operate, and the method comprises the following steps:
when the fan is in a running state, if the direct current bus voltage of the frequency converter is determined to be in a stable state, acquiring a first fan current, a second fan current, a first fan rotating speed and a second fan rotating speed, wherein the first fan current is the fan current after filtering, the second fan current is the fan current without filtering, the first fan rotating speed is the fan rotating speed after filtering, and the second fan rotating speed is the fan rotating speed without filtering;
determining the air blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed;
the determining the air blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed comprises the following steps:
if the first fan current is smaller than a first current threshold value and lasts for a first preset time, or the first fan rotating speed is larger than a first rotating speed threshold value and lasts for the first preset time, determining that the air blockage state is a slow blockage state;
if the descending amount of the second fan current in a second preset time is smaller than a second current threshold value, or the ascending amount of the second fan rotating speed in the second preset time is larger than a second rotating speed threshold value, determining that the wind blockage state is a fast blockage state;
if the descending amount of the second fan current in the second preset time is greater than or equal to the second current threshold value, and the ascending amount of the second fan rotating speed in the second preset time is less than or equal to the second rotating speed threshold value, when the second fan current is less than a third current threshold value and lasts for a third preset time, or the second fan rotating speed is greater than a third rotating speed threshold value and lasts for a third preset time, the air blocking state is determined to be a quick blocking state.
2. The method of claim 1, further comprising:
when the fan is in an operating state, acquiring a first direct current bus voltage and a second direct current bus voltage of the frequency converter, wherein the first direct current bus voltage is the direct current bus voltage subjected to filtering processing for a first preset time length, the second direct current bus voltage is the direct current bus voltage subjected to filtering processing for a second preset time length, and the first preset time length is longer than the second preset time length;
and determining the current state of the direct-current bus voltage of the frequency converter according to the first direct-current bus voltage and the second direct-current bus voltage.
3. The method of claim 2, wherein determining the current state of the dc bus voltage of the frequency converter based on the first dc bus voltage and the second dc bus voltage comprises:
if the first direct-current bus voltage is smaller than a first voltage threshold value and the second direct-current bus voltage is smaller than a second voltage threshold value, determining that the direct-current bus voltage is in a stable state;
and if the first direct current bus voltage is greater than or equal to the first voltage threshold value or the second direct current bus voltage is greater than or equal to the second voltage threshold value, determining that the direct current bus voltage is in an unstable state.
4. The method of claim 3, wherein upon determining that the DC bus voltage is in an unstable state, the method further comprises:
and if the first fan current is smaller than a fourth current threshold value or the first fan rotating speed is larger than a fourth rotating speed threshold value, determining that the wind blockage state is a slow blockage state.
5. The method of claim 1, further comprising:
acquiring the heat load of the gas water heater;
acquiring the pressure-frequency ratio of the fan according to the heat load;
and controlling the fan to operate according to the pressure-frequency ratio, and acquiring a first current threshold, a first rotating speed threshold, a second current threshold, a second rotating speed threshold, a third current threshold and a third rotating speed threshold corresponding to the pressure-frequency ratio.
6. The method according to any one of claims 1-5, further comprising:
when the fan is in a standby state, acquiring the first fan current;
and if the first fan current is greater than or equal to a fifth current threshold and lasts for a fourth preset time, determining that the fan fails.
7. A computer-readable storage medium, characterized in that it has stored thereon a computer program which, when being executed by a processor, carries out a method of identifying a wind blockage of a hard extraction gas water heater according to any one of claims 1 to 6.
8. A strong pumping gas water heater is characterized by comprising: a memory, a processor and a computer program stored on the memory and operable on the processor, when executing the program, implementing the method of identifying a wind blockage in a gas fired booster water heater according to any of claims 1 to 6.
9. The utility model provides a stifled recognition device of forced draft gas heater which characterized in that, gas heater includes the fan and is used for driving the fan moving converter, the device includes:
the acquisition module is used for acquiring a first fan current, a second fan current, a first fan rotating speed and a second fan rotating speed if the direct-current bus voltage of the frequency converter is in a stable state when the fan is in a running state, wherein the first fan current is the filtered fan current, the second fan current is the unfiltered fan current, the first fan rotating speed is the filtered fan rotating speed, and the second fan rotating speed is the unfiltered fan rotating speed;
the identification module is used for determining the air blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed;
the determining the air blockage state of the gas water heater according to the first fan current, the second fan current, the first fan rotating speed and the second fan rotating speed comprises the following steps:
if the first fan current is smaller than a first current threshold value and lasts for a first preset time, or the first fan rotating speed is larger than a first rotating speed threshold value and lasts for the first preset time, determining that the air blockage state is a slow blockage state;
if the descending amount of the second fan current in a second preset time is smaller than a second current threshold value, or the ascending amount of the second fan rotating speed in the second preset time is larger than a second rotating speed threshold value, determining that the air blockage state is a quick blockage state;
if the descending amount of the second fan current in the second preset time is greater than or equal to the second current threshold value, and the ascending amount of the second fan rotating speed in the second preset time is less than or equal to the second rotating speed threshold value, when the second fan current is less than a third current threshold value and lasts for a third preset time, or the second fan rotating speed is greater than a third rotating speed threshold value and lasts for a third preset time, the air blocking state is determined to be a quick blocking state.
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| CN103090548A (en) * | 2013-02-01 | 2013-05-08 | 广东万和新电气股份有限公司 | Protection device of gas water heater flue blockage and detecting method thereof |
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