CN110617627A - Gas water heater - Google Patents
Gas water heater Download PDFInfo
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- CN110617627A CN110617627A CN201810630772.1A CN201810630772A CN110617627A CN 110617627 A CN110617627 A CN 110617627A CN 201810630772 A CN201810630772 A CN 201810630772A CN 110617627 A CN110617627 A CN 110617627A
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- Prior art keywords
- light
- light intensity
- gas
- water heater
- control system
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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
- F24H9/00—Details
- F24H9/20—Arrangement or mounting of control or safety devices
- 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 gas water heater. The gas water heater includes a housing, a catalytic burner, and a control system. A combustion chamber is formed in the shell; the catalytic combustor is arranged in the combustion chamber; the control system is installed on the shell and comprises a first light sensor and a second light sensor, the first light sensor is arranged on the first side of the catalytic combustor and used for detecting first light intensity, the second light sensor is arranged on the second side of the catalytic combustor and used for detecting second light intensity, the first side and the second side are respectively two sides, back to back, of the catalytic combustor along a gas flow path, and the control system is used for detecting the combustion state of the catalytic combustor according to the first light intensity and the second light intensity. The gas water heater detects the combustion state of the catalytic combustor according to the first light intensity and the second light intensity, so that the combustion state of the catalytic combustor is detected in real time, safety measures are taken when the catalytic combustor is abnormal in combustion, and the safety of using the gas water heater is improved.
Description
Technical Field
The invention relates to the technical field of gas heat exchange, in particular to a gas water heater.
Background
Usually gas heater includes catalytic combustor and preheating burner, and the preheating burner is used for preheating so that catalytic combustor reaches operating temperature for catalytic combustor, but catalytic combustor and preheating burner all set up the inside at the casing, and the combustion temperature of in during operation inside is higher, can't judge catalytic combustor's combustion state, appear burning when unusual when catalytic combustor, the user still does not learn, leads to gas heater's use to have great potential safety hazard.
Disclosure of Invention
The embodiment of the invention provides a gas water heater.
The gas water heater of the embodiment of the invention comprises:
a housing having a combustion chamber formed therein;
a catalytic burner disposed within the combustion chamber; and
control system, control system installs on the casing, control system includes first light sense ware and second light sense ware, first light sense ware sets up the first side of catalytic combustor is in order to be used for detecting first light intensity, the second light sense ware sets up the second side of catalytic combustor is in order to be used for detecting the second light intensity, first side with the second side is respectively the catalytic combustor is along the both sides that carry on the back mutually of gas flow path, control system is used for the basis first light intensity with the second light intensity detects the combustion state of catalytic combustor.
In some embodiments, the side wall of the housing defines a first through hole and a second through hole in communication with the combustion chamber, the first through hole is located on the first side, the second through hole is located on the second side, the first light sensor and the second light sensor are located outside the housing, the first light sensor is aligned with the first through hole, and the second light sensor is aligned with the second through hole.
In some embodiments, the number of the side walls of the housing is multiple, and the first through hole and the second through hole are formed in the same side wall or different side walls.
In some embodiments, the control system further comprises a circuit board on which the first and second light sensors are disposed and a light shield disposed on the circuit board and surrounding the first and second light sensors.
In some embodiments, the light shield has a light hole aligned with the first through hole and the second through hole, and the light passing through the light hole is received by the first light sensor and the second light sensor.
In some embodiments, the material of the light shield is any one or more of copper, or aluminum alloy, or stainless steel.
In certain embodiments, the gas water heater further comprises a fan assembly for providing gas into the combustion chamber, the first side being upstream of the gas flow path of the second side, the control system being for:
judging whether the first light intensity is in a preset first range or not and whether the second light intensity is in a preset second range or not;
if yes, judging whether the first light intensity is smaller than the second light intensity; and
and if so, controlling the fan assembly to reduce the wind speed.
In certain embodiments, the control system is further configured to:
if the first light intensity is judged to be not less than the second light intensity, judging whether the difference value between the first light intensity and the second light intensity is less than a preset difference value or not; and
and if not, controlling the fan assembly to increase the wind speed.
In some embodiments, the gas water heater further comprises a fan assembly, a preheating burner and a temperature sensor, the fan assembly is used for providing gas into the combustion chamber, the preheating burner is installed in the combustion chamber and used for heating the catalytic burner during combustion, the temperature sensor is arranged on the catalytic burner and used for detecting the temperature of the catalytic burner, and the control system is used for controlling the fan assembly to increase the wind speed to extinguish the preheating burner when the temperature of the catalytic burner is greater than a preset temperature threshold value.
In certain embodiments, the gas water heater further comprises a fan assembly for providing gas into the combustion chamber, a preheat burner mounted in the combustion chamber for heating the catalytic burner during combustion, and an igniter for igniting the preheat burner, the control system being configured to, prior to the igniter igniting the preheat burner:
judging whether the first light intensity or the second light intensity is larger than a preset intensity threshold value; and
and if so, controlling the fan assembly to increase the wind speed.
In some embodiments, the gas water heater further comprises a gas inlet pipe for inputting gas into the combustion chamber, and the control system is configured to:
if the first light intensity or the second light intensity is judged to be smaller than a preset intensity threshold value, the igniter ignites the preheating burner;
judging whether the first light intensity is smaller than a preset first threshold value or not and whether the second light intensity is smaller than a preset second threshold value or not; and
if not, controlling to close the valve of the gas inlet pipe and controlling the fan assembly to increase the wind speed.
According to the gas water heater provided by the embodiment of the invention, the control system is arranged, the first light sensor of the control system is used for detecting the first light intensity of the first side of the catalytic combustor, the second light sensor is used for detecting the second light intensity of the second side of the catalytic combustor, and the combustion state of the catalytic combustor is detected according to the first light intensity and the second light intensity, so that the combustion state of the catalytic combustor is detected in real time, safety measures are taken when the catalytic combustor is abnormally combusted, and the safety of using the gas water heater is improved.
Additional aspects and advantages of embodiments 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 embodiments of the invention.
Drawings
The above and/or additional aspects and advantages of the present invention will become apparent and readily appreciated from the following description of the embodiments, taken in conjunction with the accompanying drawings of which:
FIG. 1 is a schematic structural view of a gas water heater according to an embodiment of the present invention;
FIG. 2 is a partial schematic block diagram of the gas water heater of FIG. 1 in a view taken in the direction II;
FIG. 3 is a schematic circuit diagram of a first optical sensor and a first optical sensor according to an embodiment of the present invention;
FIG. 4 is a schematic view of a portion of a gas water heater according to an embodiment of the present invention;
FIG. 5 is a schematic cross-sectional view taken along line V-V of the gas water heater of FIG. 4;
FIG. 6 is a schematic block diagram of a gas water heater according to an embodiment of the present invention;
fig. 7 to 11 are schematic control flow diagrams of a gas water heater according to an embodiment of the present invention.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. The same or similar reference numbers in the drawings identify the same or similar elements or elements having the same or similar functionality throughout.
In addition, the embodiments of the present invention described below with reference to the accompanying drawings are exemplary only for the purpose of explaining the embodiments of the present invention, and are not to be construed as limiting the present invention.
In the present invention, unless otherwise expressly stated or limited, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through an intermediate. Also, a first feature "on," "over," and "above" a second feature may be directly or diagonally above the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature may be directly under or obliquely under the first feature, or may simply mean that the first feature is at a lesser elevation than the second feature.
Referring to fig. 1, a gas water heater 100 is provided according to an embodiment of the present invention. The gas water heater 100 uses gas as fuel and heats water entering the gas water heater 100 by combustion. The gas water heater 100 may be a wall-mounted water heater. In one example, the gas water heater 100 includes a housing 101, and the housing 101 is provided with mounting structures, such as screw holes, bolts, etc., to facilitate mounting of the gas water heater 100 to a wall. The gas water heater 100 further includes a water inlet pipe 102 for introducing water into the gas water heater 100, a heat exchanger 103 disposed above the combustion chamber 11, and a water outlet pipe 104 for supplying hot water to the outside. The water inlet pipe 102 and the water outlet pipe 104 both pass through the heat exchanger 103, and the water outlet pipe 104 is communicated with the outside of the gas water heater 100. When the gas is combusted in the combustion chamber 11 to generate heat energy, the water entering from the water inlet pipe 102 absorbs the heat energy in the heat exchanger 103, the temperature is increased to form hot water, and the hot water flows out through the water outlet pipe 104. The gas water heater 100 further includes a fume collecting hood 105 disposed above the heat exchanger 103, and the fume collecting hood 105 is used to collect the heat-exchanged flue gas and discharge it to the outside.
Referring to fig. 1 and 4, in the embodiment of the present invention, a gas water heater 100 includes a housing 10, a catalytic burner 20, and a control system 30. The housing 10, the catalytic burner 20 and the control system 30 are all disposed within a casing 101.
A combustion chamber 11 is formed in the housing 10. When the gas water heater 100 is operated, gas is burned in the combustion chamber 11. The housing 10 provides a closed environment for combustion of the gas to avoid toxic gases such as NOx (nitrogen oxides such as NO, NO) generated by the gas during combustion2) And CO is directly released in the atmosphere and harms human bodies. The housing 10 may be made of a material having high temperature resistance, such as metal, alloy, ceramic, etc.
A catalytic burner 20 is disposed within the combustion chamber 11. The surface on the catalytic burner 20 is coated with a catalyst. Under the action of the catalyst, the ignition temperature of the fuel gas is reduced, the oxidation degree of the fuel gas is deepened, and the fire hole temperature of the catalytic combustor 20 is effectively reducedAnd thereby suppress the generation of NOx during combustion. Meanwhile, the catalyst enables the fuel gas to be flameless combusted under the condition of lower ignition temperature, and CO generated in the combustion process is oxidized into CO2Thereby achieving the purpose of reducing the emission of harmful gases. Furthermore, the catalyst makes the reactant molecule (e.g. CH)4And O2) Enriches on the surface of the catalyst to improve the reaction rate and the fuel utilization rate. In one example, the catalyst is preferably a noble metal, such as platinum, palladium, and the like.
Referring to fig. 4, the control system 30 is mounted on the housing 10. The control system 30 includes a first light sensor 31 disposed on the first side 21 of the catalytic burner 20 for detecting a first light intensity and a second light sensor 32 disposed on the second side 22 of the catalytic burner 20 for detecting a second light intensity. The first side 21 and the second side 22 are opposite sides of the catalytic burner 20 along the fuel gas flow path (in the Z direction in fig. 1). The control system 30 is adapted to detect the combustion state of the catalytic burner 20 in dependence on the first light intensity and the second light intensity.
Referring to fig. 3, the photosensors (31, 32) include a photosensitive material disposed on the surface and a chip disposed therein. Under the irradiation of light, the photosensitive material can generate electronic motion inside, so that the resistance value of the light sensor changes, and photo-generated current is output. By providing a filter on the light sensor, for example, a visible light pass filter (pass visible light, filter non-visible light), the photosensitive material only absorbs visible light and does not absorb non-visible light. Therefore, under the irradiation of visible light, the photosensitive material generates electron movement, the resistance of the photosensor changes, and photo-generated current is output. Under the irradiation of non-visible light, such as infrared light, the photosensitive material does not generate electronic motion, and the resistance value of the light sensor does not change, so that the photo-generated current cannot be output. Therefore, according to the photosensitive characteristic of the light sensor, the light sensor is connected into the circuit, and the light sensor can be used for collecting visible light and measuring the intensity of the visible light. In one example, a DC voltage is applied across the photo-sensor to measure the magnitude of the photo-generated current, thereby determining the intensity of the measured visible light. In the present embodiment, the first light sensor 31 and the second light sensor 32 are both used for collecting visible light and measuring the intensity of the visible light.
The catalytic burner 20 turns red when the combustion temperature is higher than the catalytic temperature, forming visible light that is visible to the human eye. In addition, the catalytic combustor 20 has different visible light intensities when the combustion temperatures are different. In the direction of the gas flow path, the first side 21 and the second side 22 of the catalytic burner 20 have different gas concentrations, so that the temperature of the first side 21 is different from the temperature of the second side 22 when the catalytic burner 20 is burning. According to the combustion characteristics of the catalytic combustor 20, the first light intensity detected by the first light sensor 31 is not equal to the second light intensity detected by the second light sensor 32, so that the control system 30 determines the combustion state of the catalytic combustor 20.
It should be noted that the first side 21 is located upstream of the second side 22 in the gas flow path, and that the first side 21 and the second side 22 may be any opposite sides of the catalytic burner 20 along the gas flow path. For example, referring to fig. 1, the first side 21 and the second side 22 are the upper left side and the lower left side, or the upper left side and the lower right side, or the upper right side and the lower left side, or the upper right side and the lower right side, etc. of the catalytic combustor 20, respectively. Further, when the number of the first photo sensors 31 and the second photo sensors 32 is one, the first photo sensors 31 may be located on the upper left side or the upper right side, and the second photo sensors 32 may be located on the lower left side or the lower right side. When the number of the first photo sensors 31 and the second photo sensors 32 is plural, for example, two, one of the first photo sensors 31 is located at the upper left side, the other one of the first photo sensors 31 is located at the upper right side, one of the second photo sensors 32 is located at the lower left side, and the other one of the second photo sensors 32 is located at the lower right side. The number and positions of the first and second light sensors 31 and 32 may be set according to the installation position of the catalytic burner 20 in the housing 10, and are not limited to the above examples. Of course, the first side 21 and the second side 22 may be located inside the combustion chamber 11 or outside the combustion chamber 11.
In the gas water heater 100 according to the embodiment of the invention, the control system 30 is provided, the first light sensor 31 of the control system 30 is used for detecting the first light intensity of the first side 21 of the catalytic combustor 20, the second light sensor 32 is used for detecting the second light intensity of the second side 22 of the catalytic combustor 20, and the combustion state of the catalytic combustor 20 is detected according to the first light intensity and the second light intensity, so that the gas water heater 10 can detect the combustion state of the catalytic combustor 20 in real time, and when the catalytic combustor 20 has abnormal combustion, a safety measure, such as closing a valve of the gas inlet pipe 106, is taken in time, thereby improving the safety of using the gas water heater 100.
Referring to fig. 2 and 4, in some embodiments, the sidewall 12 of the housing 10 is formed with a first through hole 13 and a second through hole 14, the first through hole 13 is located on the first side 21, and the second through hole 14 is located on the second side 22. The first and second light sensors 31 and 32 are disposed outside the housing 10, the first light sensor 31 is aligned with the first through hole 13, and the second light sensor 32 is aligned with the second through hole 14. Specifically, when the catalytic combustor 20 is burning, the light of the first side 21 is transmitted through the first through hole 13 and received by the first light sensor 31. The light from the second side 22 passes through the second through hole 14 and is received by the second light sensor 32. Since the temperature in the combustion chamber 11 is high at the time of combustion by the catalytic combustor 20, the performance of the first and second photoreceptors 31 and 32 is easily affected. Therefore, the first light sensor 31 and the second light sensor 32 are disposed outside the housing 10 with a lower temperature, so that the influence of a high temperature on the first light sensor 31 and the second light sensor 32 can be reduced, the service lives of the first light sensor 31 and the second light sensor 32 are prolonged, and the measured first light intensity and the measured second light intensity are more accurate.
Referring to fig. 1 and 2, in some embodiments, the number of the side walls 12 of the housing 10 is multiple, and the first through hole 13 and the second through hole 14 may be formed on the same side wall 12 or different side walls 12.
Specifically, the combustion chamber 11 may be collectively enclosed by a plurality of side walls 12 of the casing 10. As shown in fig. 1, the first through hole 13 and the second through hole 14 are opened on the same side wall 12, for example, the first through hole 13 and the second through hole 14 are respectively located on the upper left side and the lower left side, or the upper right side and the lower right side of the catalytic combustor 20. Of course, the first through holes 13 and the second through holes 14 may be opened on different side walls 12, for example, the first through holes 13 and the second through holes 14 are respectively located on the upper left side and the lower right side, or the upper right side and the lower left side of the catalytic combustor 20. The number, position, and hole diameter of the first through holes 13 and the second through holes 14 correspond to the number, position, and shape of the first photo sensors 31 and the second photo sensors 32, and may be set according to the actual situation, and are not limited to the above examples.
Referring to fig. 4 and 5, in some embodiments, the control system 30 further includes a circuit board 33 and a light shield 34, the first light sensor 31 and the second light sensor 32 are disposed on the circuit board 33, and the light shield 34 is disposed on the circuit board 33 and surrounds the first light sensor 31 and the second light sensor 32.
The circuit board 33 may be one or both of a hard board and a flexible-rigid board. The circuit board 33 is disposed outside the housing 10 and spaced apart from the side wall 12 of the housing 10. The circuit board 33 is used to fix the first and second photo sensors 31 and 32, and can control the first and second photo sensors 31 and 32 to detect the first and second light intensities. The connection between the circuit board 33 and the first and second photo sensors 31 and 32 includes soldering, engaging, and screwing.
A light shield 34 is also provided on the circuit board 33. The light shield 34 is disposed around the first and second light sensors 31 and 32 for shielding light entering the first and second light sensors 31 and 32 from outside the combustion chamber 11. In this way, under the shielding of the light shield 34, the first light sensor 31 only receives the light from the first through hole 13, and the second light sensor 32 only receives the light from the second through hole 14, so that the measured first and second light intensities are more accurate. Specifically, the number of the light shields 34 corresponds to the number of the first light sensors 31 and the second light sensors 32, for example, the number of the first light sensors 31 and the second light sensors 32 is one, the number of the light shields 34 is two, the number of the first light sensors 31 and the second light sensors 32 is two, and the number of the light shields 34 is four. In the embodiment of the present invention, the light shield 34 includes only one light shielding sidewall 341, and one light shielding sidewall 341 is enclosed to form a cylinder shape. In another embodiment, the light shield 34 may further include a plurality of light shielding sidewalls 341, and the plurality of light shielding sidewalls 341 may be enclosed in a shape of a quadrangular prism, a pentagonal prism, a hexagonal prism, or the like. In the embodiment of the present invention, the light shielding cover 34 is made of any one or more of copper, aluminum alloy, or stainless steel, for example, the light shielding cover 34 is made of copper pipe, and the copper pipe covers the first light sensor 31 and the second light sensor 32. Thus, the light shield 34 can rapidly release the heat radiation from the first through hole 13 and the second through hole 14 to the outside air of the light shield 34 by using the material with high temperature resistance and good heat radiation performance, so as to reduce the influence of the heat radiation on the first light sensor 31 and the second light sensor 32.
Referring to fig. 5, in some embodiments, the light shield 34 is formed with a light hole 342, the light hole 342 is aligned with the first through hole 13 and the second through hole 14, and the light passing through the light hole 342 is received by the first light sensor 31 and the second light sensor 32. In other embodiments, the light shielding sidewall 341 of the light shield 34 is made of a material with better heat dissipation, such as copper, aluminum alloy, or stainless steel, and the top wall 343 of the light shield 34 is made of a material with high temperature resistance and light transmittance, such as glass, so that the light shield 34 does not need to be provided with the light transmitting hole 342, and the light from the first through hole 13 and the second through hole 14 can be received by the first light sensor 31 and the second light sensor 32 after passing through the top wall 343.
Referring to FIG. 1, in certain embodiments, the gas water heater 100 further includes a fan assembly 40, a preheat burner 50, and an igniter 60.
The fan assembly 40 is used to supply fuel gas into the combustion chamber 11. Specifically, the fan assembly 40 includes a fan 41 and a gas distributor 42 that interface. The blower 41 serves to suck air outside the casing 10 and to input high-speed air to the air distributor 42. Specifically, the blower 41 includes a blower inlet and a blower outlet (both not shown), the blower inlet is communicated with the outside of the gas water heater 100, and the blower outlet is communicated with the inlet of the gas distributor 42. The outlet (not shown) of the gas distributor 42 communicates with the combustion chamber 11. The gas water heater 100 also includes a gas inlet pipe 106. The gas inlet pipe 106 is used to supply gas into the combustion chamber 11. The gas inlet conduit 106 communicates with the gas distributor 42. The gas is fed from the gas inlet pipe 106, mixed with the high-speed air from the fan 41 in the gas distributor 42, and enters the combustion chamber 11 from the outlet of the gas distributor 42.
The preheating burner 50 is installed in the combustion chamber 11 and serves to heat the catalytic burner 20 at the time of combustion. Specifically, the preheating burner 50 is installed at the bottom of the casing 10 near the inlet of the combustion chamber 11. The preheating burner 50 is disposed side by side with the catalytic burner 20, and the preheating burner 50 is disposed above the catalytic burner 20 in a direction along the fuel gas flow path. The gas water heater 100 also includes an igniter 60 and a control panel 70. The igniter 60 is provided on the control plate 70 and serves to ignite the preheating burner 50. Specifically, when the gas water heater 100 is operated, the valve of the gas inlet pipe 106 is opened, the igniter 60 ignites the preheating burner 50, the preheating burner 50 starts to burn the gas, and the heat generated by the combustion preheats the catalytic burner 20. In one example, the control board 70 is part of the control system 30.
Referring to fig. 4, in some embodiments, the gas water heater 100 further includes a temperature sensor 80, and the temperature sensor 80 is disposed on the catalytic burner 20 and is used for detecting the temperature of the catalytic burner 20. The control system 30 is configured to control the fan assembly 40 to increase the wind speed to extinguish the preheat burner 50 when the temperature of the catalytic burner 20 is greater than a preset temperature threshold T.
Specifically, the side wall 12 of the casing 10 is further opened with a through hole (not shown), and the temperature sensor 80 is extended from the through hole into the combustion chamber 11 and is disposed on the catalytic combustor 20, and the temperature sensor 80 may be a thermocouple. When the temperature sensor 80 detects that the temperature of the catalytic combustor 20 reaches the preset temperature threshold T, the catalytic combustor 20 starts to burn, and at this time, the gas water heater 100 controls the fan 41 to extinguish the fire of the catalytic combustor 50. Specifically, the gas water heater 100 controls the fan 41 to increase the intake amount of the mixed gas formed by mixing the air and the gas in a unit time so as to extinguish the preheating burner 50, that is, the flame on the preheating burner 50 can be quickly extinguished by controlling the intake speed of the mixed gas to reach the de-firing line speed of the preheating burner 50, so as to switch to the catalytic combustion by the catalytic burner 20. In one example, the control system 30 determines whether the temperature sensor 80 detects that the temperature change of the catalytic combustor 20 falls within a normal range within a preset time, and controls the valve body control module 600 (as shown in fig. 6) to close the valve of the gas inlet pipe 106 and increase the wind speed of the fan 41 to extinguish the flame of the preheating combustor 50 when the temperature change does not fall within the normal range. Specifically, a preset time, for example, 10 seconds, is set, and when the temperature change of the catalytic combustor 20 is abnormal, it indicates that the preheating combustor 50 is not normally heating the catalytic combustor 20 or that the performance of the temperature sensor 80 is abnormal. At this time, it cannot be determined whether the temperature of the catalytic combustor 20 reaches the preset temperature threshold T, and the control system 30 cannot determine the timing for closing the preheating combustor 50, so that the preheating combustor 50 heats the catalytic combustor 20 all the time, and a great potential safety hazard exists. Therefore, the combustion state of the gas water heater 100 is determined in time by determining whether the temperature change detected by the temperature sensor 80 is within the normal range, thereby improving the safety of using the gas water heater 100.
Referring to fig. 6, in some embodiments, the gas water heater 100 further includes an ambient light measuring module 200, an outlet water temperature module 300, a fan wind speed measuring module 400, a fan control module 500, a valve body control module 600, a water flow detecting module 700, an ignition module 800, and an ion flame detecting module 900. The control system 30 is used for controlling the ambient light measuring module 200 to detect the combustion state of the catalytic combustor 20, collecting data of the above-mentioned peripheral measuring modules, running PID (proportional), integral (integral), derivative (derivative) algorithms, and controlling the output of peripheral loads (such as the fan 41). Specifically, the control system 30 is configured to control the outlet water temperature module 300 to measure the water temperature, and calculate the current heat load according to the opening degree of the gas proportional valve 107 (as shown in fig. 1); also for detecting the wind speed of the fan 41 by controlling the fan wind speed measuring module 400; and is also used to control the blower control module 500 to control the air volume of combustion; the valve body control module 600 is also used for controlling the flow of the fuel gas in the fuel gas inlet pipe 106; and is further configured to control the water flow detection module 700 to detect a current water flow; and is also used to control the ignition module 800 and the ion flame detection module 900 to achieve ignition and detection of flame ions. In one example, the control system 30 includes an MCU microprocessor.
The gas water heater 100 of the embodiment of the invention detects the combustion state of the catalytic combustor 20 in real time through the first light sensor 31 and the second light sensor 32 of the control system 30, and takes safety measures in time when the catalytic combustor 20 is abnormal in combustion, for example, a valve of the gas inlet pipe 106 on the gas inlet pipe 106 is closed, so that the safety of using the gas water heater 100 is improved. Hereinafter, the safety measures taken when the catalytic burner 20 has combustion abnormality in the gas water heater 100 will be described in detail with reference to the specific control flow of the gas water heater 100.
Referring to fig. 6 and 7, in some embodiments, prior to the ignition of the preheat burner 50 by the igniter 60, the control system 30 is configured to perform the steps of:
s10, judging whether the first light intensity or the second light intensity is larger than a preset intensity threshold value; and
and S20, if yes, controlling the fan assembly 40 to increase the wind speed.
After the gas water heater 100 is started, when the water inlet pipe 102 is not filled with water, the gas water heater 100 is in a standby state, the valve of the gas inlet pipe 106 is not opened, and the igniter 60 does not ignite the preheating burner 50. Normally, no gas is burned in the combustion chamber 11, and the light intensity in the combustion chamber 11 is weak. The first and second light intensities detected by the first and second light sensors 31 and 32 are weak. For example, the preset intensity threshold is 50cd, and when the first light intensity and the second light intensity are both smaller than 50cd, for example, any one of 5cd, 15cd, 20cd, and 45cd, it can be determined that the current first light intensity and the current second light intensity are normal light intensities, and it is determined that no gas is burning in the combustion chamber 11, and the gas water heater 100 is in a normal state. When the first light intensity or the second light intensity is greater than 50cd, that is, the first light intensity is greater than 50cd, the second light intensity is greater than 50cd, and the first light intensity and the second light intensity are both greater than 50cd, the situation that gas combustion exists in the combustion chamber 11 can be judged, and the control system 30 judges that the gas water heater 100 belongs to an abnormal state and has a large potential safety hazard. At this time, the control system 30 immediately controls the valve body control module 600 to close the valve of the gas inlet pipe 106 and increase the wind speed of the fan 41 to extinguish the flame in the combustion chamber 11.
Referring to fig. 6 and 8, in some embodiments, the control system 30 is further configured to perform the steps of:
s30, if the first light intensity or the second light intensity is smaller than the preset intensity threshold, the igniter 60 ignites the preheating burner 50;
s40, judging whether the first light intensity is smaller than a preset first threshold value and whether the second light intensity is smaller than a preset second threshold value; and
and S50, if the air speed is not increased, controlling to close the valve of the fuel gas inlet pipe 106 and controlling the fan assembly 40 to increase the air speed.
After the gas water heater 100 is started, the water inlet pipe 102 is filled with water, and the control system 30 controls the fan 41 to be started to clean the interior of the combustion chamber 11, so that residual gas and slight leakage gas accumulated for a long time in the combustion chamber 11 are removed, normal ignition of the gas water heater 100 is ensured, and deflagration is avoided. During the pre-purge, the gas water heater 100 is in a standby state, the valve of the gas inlet pipe 106 is not opened, and the igniter 60 does not ignite the preheating burner 50. After the front cleaning is completed, when it is judged that both the first light intensity and the second light intensity are smaller than the preset intensity threshold, the igniter 60 ignites the preheating burner 50 to perform combustion in a full premix manner. At this time, the control system 30 is also used to control the ion flame detection module 900 to detect ions in the flame. When the catalytic burner 20 reaches the preset temperature threshold T, the catalytic burner 20 starts to burn, and when the ion flame detection module 900 detects that the number of flame ions is reduced, it indicates that the catalytic burner 20 enters the catalytic combustion mode. The temperature of the catalytic burner 20 continues to rise and emits visible light, illuminating the upper combustion chamber.
When the catalytic burner 20 burns for a period of time, for example, 20 seconds, the first light sensor 31 detects the first light intensity and the second light sensor 32 detects the second light intensity. Whether the first light intensity is smaller than a preset first threshold value is judged, for example, the first threshold value is 500cd, and when the first light intensity is 520cd, 600cd, 720cd or 800cd, the first light intensity can be judged to be larger than the first threshold value. Meanwhile, it is also required to determine whether the second light intensity is smaller than a preset second threshold, for example, the second threshold is 200cd, and when the second light intensity is 220cd, 300cd, 420cd, or 500cd, it can be determined that the second light intensity is larger than the second threshold. When the first light intensity is greater than the preset first threshold and the second light intensity is greater than the preset second threshold, it indicates that the preheating burner 50 is burning normally.
When the first light intensity is smaller than the preset first threshold or the second light intensity is smaller than the preset second threshold, for example, the first light intensity is 300cd, 350cd, 400cd, 480cd, and the second light intensity is 80cd, 120cd, 140cd, 180cd, indicating that the combustion of the preheating burner 50 is abnormal. The reasons for the abnormality include that the gas inlet pipe 106 or the fan 41 has a problem, and the amount of gas entering the combustion chamber 11 is small, the preheating burner 50 is not sufficiently combusted, and toxic gases such as NOx and CO are generated. At this time, the control system 30 controls the valve body control module 600 to close the valve of the gas inlet pipe 106 and controls the fan assembly 40 to increase the wind speed to strongly purge the gas in the combustion chamber 11.
Referring to fig. 6 and 9, in some embodiments, the control system 30 is further configured to perform the steps of:
s60, judging whether the first light intensity is in a preset first range and whether the second light intensity is in a preset second range;
s70, if yes, judging whether the first light intensity is smaller than the second light intensity; and
and S80, if yes, controlling the fan assembly 40 to reduce the wind speed.
In step S60, after the catalytic burner 20 starts to operate, the first light sensor 31 detects the first light intensity of the first side 21 when the catalytic burner 20 is burning, and the second light sensor 32 detects the second light intensity of the second side 22 when the catalytic burner 20 is burning. When the first light intensity is within a preset first range, it is determined that the gas on the first side 21 of the catalytic combustor 20 is normally combusted, for example, when the preset first range is [800cd, 1500cd ], and the first light intensity is any one of 850m, 1250cd, 1320cd, and 1480m, it is determined that the gas on the first side 21 of the catalytic combustor 20 is normally combusted. When the first light intensity is not within the preset first range, it is judged that the gas on the first side 21 of the catalytic burner 20 is abnormally combusted. In particular, when the first light intensity is less than 800cd, for example any one of 50cd, 400cd, 600cd, 780cd, it may be judged that the first side 21 of the catalytic burner 20 is in the warm-up phase, i.e. the preheating burner 50 is still heating the catalytic burner 20. When the first light intensity is greater than 1500cd, for example, any one of 1550cd, 1600cd, 1800cd and 2000cd, it can be determined that the first side 21 of the catalytic burner 20 is in an over-burning stage, i.e. the first side 21 of the catalytic burner 20 has a high gas concentration, which is likely to cause ignition, explosion and the like. At this time, the control system 30 judges that there is a great potential safety hazard in the combustion of the catalytic combustor 20, and the control system 30 immediately controls the valve body control module 600 to close the valve of the gas inlet pipe 106 and increase the air speed of the fan 41, so as to extinguish the flame on the catalytic combustor 20.
Similarly, when the second light intensity is within the preset second range, it is determined that the gas on the second side 22 of the catalytic combustor 20 is normally combusted, for example, when the preset second range is [500cd, 1200cd ], and the second light intensity is any one of 550m, 650cd, 720cd, and 1180m, it may be determined that the gas on the second side 22 of the catalytic combustor 20 is normally combusted. When the second light intensity is not within the preset second range, it is judged that the gas on the second side 22 of the catalytic combustor 20 is abnormally combusted. In particular, when the second light intensity is less than 500cd, for example, any one of 50cd, 200cd, 300cd, 480cd, it may be judged that the second side 22 of the catalytic burner 20 is in the warm-up phase, i.e. the preheating burner 50 is still heating the catalytic burner 20. When the second light intensity is greater than 1200cd, for example, any one of 1250cd, 1400cd, 1450cd, and 1500cd, it can be determined that the second side 22 of the catalytic combustor 20 is in an excessive combustion stage, that is, the concentration of the gas on the second side 22 of the catalytic combustor 20 is relatively high, which is likely to cause ignition, explosion, and the like, at this time, the control system 30 determines that there is a relatively high potential safety hazard in the combustion of the catalytic combustor 20, and the control system 30 immediately controls the valve body control module 600 to close the valve of the gas inlet pipe 106 and increase the wind speed of the fan 41, so as to extinguish the flame on the catalytic combustor 20.
During normal combustion of the catalytic burner 20, the first light intensity is greater than the second light intensity because the gas concentration on the first side 21 is greater than the gas concentration on the second side 22. Therefore, in steps S70 and S80, when it is judged that the first light intensity is in the preset first range and the second light intensity is in the preset second range, and it is judged that the first light intensity is less than the second light intensity, the control system 30 judges that the combustion of the catalytic combustor 20 is abnormal. For example, the first light intensity is 850cd and the second light intensity is 1050cd, indicating that the combustion on the first side 21 of the catalytic burner 20 is weaker and the combustion on the second side 22 is too strong. At this point, the control system 30 controls the fan assembly 40 to reduce the wind speed to reduce the de-firing line speed of the first side 21, thereby allowing for more complete combustion of the gas at the first side 21. In one example, the control system 30 may also increase the intake of gas to enable combustion on the first side 21 to be more efficient.
Referring to fig. 9 and 10, in some embodiments, the control system 30 is further configured to perform the steps of:
s71, if the first light intensity is not less than the second light intensity, judging whether the difference value between the first light intensity and the second light intensity is less than a preset difference value; and
and S81, if not, controlling the fan assembly 40 to increase the wind speed.
In step S60, when the first light intensity is within the first predetermined range and the second light intensity is within the second predetermined range, and the first light intensity is not less than the second light intensity, the control system 30 determines whether the difference between the first light intensity and the second light intensity is less than the predetermined difference. For example, the predetermined difference is 500cd, and when the difference between the first light intensity and the second light intensity is 550cd, 600cd, 800cd, 1000cd, the combustion on the first side 21 of the catalytic combustor 20 is determined to be too strong, and the combustion on the second side 22 is determined to be weak. At this point, the control system 30 controls the fan assembly 40 to increase the wind speed to increase the de-ignition line speed of the first side 21, thereby causing the combustion of the gas on the first side 21 to be reduced. In one example, the control system 30 may also attenuate combustion on the first side 21 by reducing the amount of intake air of the gas.
Referring to fig. 6 and 11, in some embodiments, after the pilot burner 50 is ignited by the igniter 60, the control system 30 is further configured to perform the steps of:
s90, detecting the water inlet temperature and the water inlet flow of the gas water heater 100;
s100, calculating the current heat load according to the inflow, the set temperature and the outflow temperature;
s110, judging whether the current heat load is in a preset gas heat load range or not; and
and S120, if not, adjusting the load curve.
After the pilot burner 50 is ignited by the igniter 60 to perform combustion in a fully premixed manner, the control system 30 controls the ion flame detection module 900 to detect ions in the flame. When the decrease in the number of flame ions is detected, the control system 30 judges that the ignition is successful. When it is detected that the number of flame ions is not reduced, the control system 30 determines that the ignition is not successful, and signals a flame failure while closing the valve of the gas inlet pipe 106.
After successful ignition, the catalytic burner 20 has not yet reached the preset temperature threshold T. At this time, the control system 30 also needs to select the preheating load. The load curve is a climbing curve of the gas proportional valve 107 and the fan 41 set when the gas water heater 100 leaves a factory, and the gas water heater 100 adjusts the gas amount entering the combustion chamber 11 and the wind speed of the fan according to the load curve. When the control system 30 determines that the current heat load is not in the preset gas heat load range, the control system 30 adjusts the load curve, specifically including the following two ways:
(1) during operation of the fan assembly 40, the fan speed measurement module 400 monitors fan speed and fan current according to a standard curve. When the wind speed of the fan 41 is high and the current of the fan 41 decreases, the fan wind speed measuring module 400 determines that there is reverse flow wind outside or the exhaust passage of the fume collecting hood 105 is blocked. At this time, the control system 30 controls the fan 41 to increase the wind speed so that the current of the fan 41 reaches a predetermined value.
(2) When the wind speed and the current of the fan 41 are both within the standard range, the current heat load is still low, and the control system 30 determines that the heat value of the fuel gas is insufficient or the pressure of the primary air supply is insufficient. At this time, the control system 30 automatically corrects the current of the gas proportional valve 107 according to the difference of the current thermal load being low, and increases the gas outlet amount of the gas inlet pipe 106 to ensure the thermal efficiency of the gas water heater 100.
In the description of the specification, reference to the terms "certain embodiments," "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" 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, schematic representations of the above terms 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.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, unless specifically limited otherwise.
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 those skilled in the art can make changes, modifications, substitutions and alterations to the above embodiments within the scope of the present invention, which is defined by the claims and their equivalents.
Claims (11)
1. A gas water heater, comprising:
a housing having a combustion chamber formed therein;
a catalytic burner disposed within the combustion chamber; and
control system, control system installs on the casing, control system includes first light sense ware and second light sense ware, first light sense ware sets up the first side of catalytic combustor is in order to be used for detecting first light intensity, the second light sense ware sets up the second side of catalytic combustor is in order to be used for detecting the second light intensity, first side with the second side is respectively the catalytic combustor is along the both sides that carry on the back mutually of gas flow path, control system is used for the basis first light intensity with the second light intensity detects the combustion state of catalytic combustor.
2. The gas water heater of claim 1, wherein the side wall of the housing defines a first through hole and a second through hole in communication with the combustion chamber, the first through hole being located on the first side, the second through hole being located on the second side, the first light sensor and the second light sensor being located outside the housing, the first light sensor being aligned with the first through hole, the second light sensor being aligned with the second through hole.
3. The gas water heater of claim 2, wherein the number of the side walls of the housing is plural, and the first through hole and the second through hole are provided on the same side wall or different side walls.
4. The gas water heater of claim 2, wherein the control system further comprises a circuit board on which the first and second light sensors are disposed and a light shield disposed on the circuit board and surrounding the first and second light sensors.
5. The gas water heater of claim 4, wherein the light shield defines a light hole aligned with the first and second through holes, and light passing through the light hole is received by the first and second light sensors.
6. The gas water heater of claim 4, wherein the material of the light shield is any one or more of copper, or aluminum alloy, or stainless steel.
7. The gas water heater of any one of claims 1-6, further comprising a fan assembly for providing gas into the combustion chamber, the first side being upstream of the gas flow path of the second side, the control system being configured to:
judging whether the first light intensity is in a preset first range or not and whether the second light intensity is in a preset second range or not;
if yes, judging whether the first light intensity is smaller than the second light intensity; and
and if so, controlling the fan assembly to reduce the wind speed.
8. The gas water heater of claim 7, wherein the control system is further configured to:
if the first light intensity is judged to be not less than the second light intensity, judging whether the difference value between the first light intensity and the second light intensity is less than a preset difference value or not; and
and if not, controlling the fan assembly to increase the wind speed.
9. The gas water heater of any one of claims 1-6, further comprising a fan assembly, a preheating burner and a temperature sensor, wherein the fan assembly is used for providing gas into the combustion chamber, the preheating burner is installed in the combustion chamber and used for heating the catalytic burner during combustion, the temperature sensor is arranged on the catalytic burner and used for detecting the temperature of the catalytic burner, and the control system is used for controlling the fan assembly to increase the wind speed to extinguish the preheating burner when the temperature of the catalytic burner is greater than a preset temperature threshold value.
10. The gas water heater of any one of claims 1-6, further comprising a fan assembly for providing gas into the combustion chamber, a preheating burner mounted in the combustion chamber for heating the catalytic burner during combustion, and an igniter for igniting the preheating burner, the control system being configured to, prior to the igniter igniting the preheating burner:
judging whether the first light intensity or the second light intensity is larger than a preset intensity threshold value; and
and if so, controlling the fan assembly to increase the wind speed.
11. The gas water heater of claim 10, further comprising a gas inlet pipe for inputting gas into the combustion chamber, the control system for:
if the first light intensity or the second light intensity is judged to be smaller than a preset intensity threshold value, the igniter ignites the preheating burner;
judging whether the first light intensity is smaller than a preset first threshold value or not and whether the second light intensity is smaller than a preset second threshold value or not; and
if not, controlling to close the valve of the gas inlet pipe and controlling the fan assembly to increase the wind speed.
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| CN201810630772.1A CN110617627B (en) | 2018-06-19 | 2018-06-19 | Gas water heater |
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| CN201810630772.1A CN110617627B (en) | 2018-06-19 | 2018-06-19 | Gas water heater |
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| CN110617627B CN110617627B (en) | 2022-03-18 |
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| CN113432308A (en) * | 2021-07-30 | 2021-09-24 | 广东万和新电气股份有限公司 | Gas water heater and control method and control device thereof |
| CN114151979A (en) * | 2021-11-29 | 2022-03-08 | 广东万和新电气股份有限公司 | Control method and device of gas water heater, control equipment and gas water heater |
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Effective date of registration: 20230316 Address after: 241000 west side of 3 / F, No.5 office building, new energy and new materials gathering area, Fuzhou Road, Jiangbei District, Wuhu City, Anhui Province Patentee after: Wuhu Midea intelligent kitchen electricity Manufacturing Co.,Ltd. Address before: 241009 Wan Chun East Road, East District, Wuhu economic and Technological Development Zone, Anhui Patentee before: WUHU MIDEA KITCHEN AND BATH APPLIANCES MFG. Co.,Ltd. |