CN108980888B - Gas heating equipment and control method thereof - Google Patents
Gas heating equipment and control method thereof Download PDFInfo
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- CN108980888B CN108980888B CN201810728660.XA CN201810728660A CN108980888B CN 108980888 B CN108980888 B CN 108980888B CN 201810728660 A CN201810728660 A CN 201810728660A CN 108980888 B CN108980888 B CN 108980888B
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- gas
- pressure
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- smoke exhaust
- channel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N1/00—Regulating fuel supply
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2225/00—Measuring
- F23N2225/04—Measuring pressure
- F23N2225/06—Measuring pressure for determining flow
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2239/00—Fuels
- F23N2239/04—Gaseous fuels
Abstract
The invention discloses a gas heating device and a control method thereof. The control method comprises the following steps: when the gas heating equipment is in a working state, the gas inlet flow of the gas inlet channel is adjusted by combining the pressure in the smoke exhaust channel. According to the control method of the gas heating equipment, the gas inlet flow of the gas inlet channel is adjusted by combining the pressure in the smoke exhaust channel, so that complete combustion of gas can be guaranteed, further, when the smoke exhaust channel is blocked to a certain degree, the equipment is closed when the pressure in the smoke exhaust channel is continuously reduced to the minimum pressure value, the condition of false alarm of the equipment can be effectively avoided, and the use comfort of a user is improved.
Description
Technical Field
The invention relates to the technical field of gas equipment, in particular to gas heating equipment and a control method thereof.
Background
Gas heating equipment such as gas water heaters, gas heating water heaters and the like is more and more widely applied to the life of people due to the advantages of convenience in heat taking, energy conservation and the like, the gas inlet flow of the existing equipment is adjusted only according to the required heating temperature, so that incomplete combustion of gas can be caused when a smoke exhaust pipe of the gas heating equipment is blocked, and harmful gas is easily discharged.
In addition, in order to ensure the safety of the gas heating device, when the smoke exhaust pipe of the gas heating device is blocked, the gas heating device needs to be controlled to stop. The existing control method is that a wind pressure switch or a wind pressure sensor is used for detecting the pressure change of a fan port detected by a venturi tube to judge whether a smoke exhaust pipe is blocked, and when the wind pressure switch acts or the pressure detected by the wind pressure sensor is at a preset pressure value, the equipment is controlled to be closed. During the use process, the control method is very easy to cause fault misjudgment, thereby influencing the normal use of the equipment.
Disclosure of Invention
In view of the above, an object of the present invention is to provide a control method for a gas heating apparatus and a gas heating apparatus, which can ensure complete combustion of gas.
In order to achieve the above purpose, on one hand, the invention adopts the following technical scheme:
a control method of a gas heating apparatus, the apparatus including a smoke exhaust passage and a gas intake passage, the control method comprising:
when the gas heating equipment is in a working state, regulating the gas inlet flow of the gas inlet channel by combining the pressure in the smoke exhaust channel;
an adjusting valve for adjusting the air inlet flow is arranged in the gas inlet channel, and the air inlet flow is adjusted by controlling the opening degree of the adjusting valve;
and different pressure intervals correspond to different opening upper limits, the corresponding opening upper limit is obtained according to the pressure interval to which the current pressure in the smoke exhaust channel belongs, whether the current opening of the regulating valve is larger than the corresponding opening upper limit is judged, if yes, the current opening of the regulating valve is regulated to the corresponding opening upper limit, and if not, the current opening is kept unchanged.
Preferably, adjusting the intake air flow rate of the gas intake passage in conjunction with the pressure in the smoke evacuation passage comprises:
and determining the upper flow limit of the intake air flow according to the pressure in the smoke exhaust channel, and controlling the intake air flow of the gas intake channel not to exceed the upper flow limit.
Preferably, said different pressure interval has the lowest pressure value,
controlling the apparatus to shut down when the pressure within the flue gas channel is equal to or lower than the minimum pressure value; alternatively, the first and second electrodes may be,
and when the pressure in the smoke exhaust channel is equal to or equal to the minimum pressure value, the corresponding opening degree of the regulating valve is a preset opening degree, and when the opening degree of the regulating valve is judged to be the preset opening degree, the equipment is controlled to be closed.
Preferably, said minimum pressure value is between 40 and 60 Pa; and/or the presence of a gas in the gas,
the predetermined opening is 80% to 90%.
Preferably, the duty ratio of the regulating valve is regulated by controlling the input signal voltage or the input signal current of the regulating valve, thereby regulating the opening degree of the regulating valve, wherein different upper opening degree limits correspond to different input signal voltage values or different input signal current values.
Preferably, the device further includes an airflow driving device for driving airflow in the smoke exhaust channel to flow and a combustion component for combusting gas to supply heat, after the device is started, the airflow driving device is started first, current pressure in the smoke exhaust channel is detected, if the current pressure is equal to or lower than the minimum pressure value, or an opening upper limit of the regulating valve obtained according to the current pressure is a preset opening, the combustion component is not started, otherwise, the combustion component is started.
On the other hand, the invention adopts the following technical scheme:
a gas heating apparatus controlled using the control method of the gas heating apparatus as described above, the apparatus comprising:
a combustion part for combusting gas to supply heat;
a smoke exhaust channel for exhausting smoke;
a gas inlet passage for supplying gas to the combustion part;
the flow regulating device is used for regulating the air inlet flow of the gas inlet channel;
the pressure detection device is used for detecting the pressure in the smoke exhaust channel;
and the control device is used for controlling the flow regulating device according to the target heating temperature of the gas heating equipment and the pressure detected by the pressure detection device.
Preferably, the apparatus further comprises an airflow driving device for driving airflow in the smoke evacuation channel, and the control device is further configured to control opening and closing of the airflow driving device and the combustion part according to the pressure detected by the pressure detection device.
Preferably, the gas heating apparatus includes a gas water heater or a gas heating water heater.
Has the advantages that:
according to the control method of the gas heating equipment, the gas inlet flow of the gas inlet channel is adjusted by combining the pressure in the smoke exhaust channel, so that complete combustion of gas can be guaranteed, further, when the smoke exhaust channel is blocked to a certain degree, the equipment is closed when the pressure in the smoke exhaust channel is continuously reduced to the minimum pressure value, the condition of false alarm of the equipment can be effectively avoided, and the use comfort of a user is improved.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following description of the embodiments of the present invention with reference to the accompanying drawings, in which:
fig. 1 shows a corresponding relationship diagram of a wind pressure signal P and an upper limit of an input signal voltage U provided by the embodiment of the present application.
Fig. 2 shows a flowchart of a control method of a gas heating apparatus according to an embodiment of the present application.
Detailed Description
The present invention will be described below based on examples, but the present invention is not limited to only these examples. Well-known methods, procedures, and components have not been described in detail so as not to obscure the present invention.
Further, those of ordinary skill in the art will appreciate that the drawings provided herein are for illustrative purposes and are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, what is meant is "including, but not limited to".
In the description of the present invention, it is to be understood that the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. In addition, in the description of the present invention, "a plurality" means two or more unless otherwise specified.
The application provides a control method of gas heating equipment, wherein the gas heating equipment comprises a combustion part, a smoke exhaust channel for exhausting smoke and a gas channel for supplying gas to the combustion part, a pressure detection device is arranged in the smoke exhaust channel and used for detecting the pressure in the smoke exhaust channel (namely the wind pressure in the smoke exhaust channel) and reflecting the blocking degree of the smoke exhaust channel, and a flow regulation device is arranged in the gas inlet channel and used for regulating the gas inlet flow of the gas inlet channel. The control method comprises the following steps:
when the gas heating equipment is in a working state, the air inlet flow of the gas inlet channel is adjusted by combining the pressure in the smoke exhaust channel.
So, can make gas inlet channel's inlet flow and the exhaust flue gas flow phase-match of smoke exhaust channel, guarantee that the gas can burn completely to avoid harmful gas's discharge amount.
The adjusting of the intake flow of the gas intake channel in combination with the pressure in the smoke exhaust channel includes adjusting the intake flow of the gas intake channel according to the target temperature and the pressure in the smoke exhaust channel when the heating temperature of the gas heating device needs to be adjusted, and adjusting the intake flow of the gas intake channel according to the pressure in the smoke exhaust channel when the gas heating device is heated at a constant temperature.
The above control process may be performed by a control device of the gas heating apparatus, that is, the control device controls the flow rate adjusting device according to the pressure detected by the pressure detecting device to adjust the intake air flow rate of the gas intake passage.
Specifically, the upper flow limit of the intake air flow is determined according to the pressure in the smoke exhaust channel, that is, under the condition of the pressure, if the maximum value which can be reached by the intake air flow is ensured and the combustion of the gas is fully ensured, the intake air flow of the gas intake channel is controlled not to exceed the upper flow limit, that is, if the current intake air flow is lower than or equal to the upper flow limit, the upper flow limit is maintained, and if the current intake air flow is higher than the upper flow limit, the current flow is reduced to the upper flow limit.
Further, the flow regulating device is a regulating valve, the regulating valve is preferably an electromagnetic proportional valve, and the regulation of the intake air flow can be realized by controlling the opening degree of the regulating valve, the control method is further specifically that different pressure intervals correspond to different opening degree upper limits, when the gas heating equipment is in an operating state, the current pressure in the smoke exhaust channel is obtained once at intervals of a preset time or when the pressure in the smoke exhaust channel is monitored to be changed, the corresponding opening degree upper limit is obtained according to the pressure interval to which the current pressure in the smoke exhaust channel belongs, whether the current opening degree of the regulating valve is greater than the corresponding opening degree upper limit is judged, if yes, the current opening degree of the regulating valve is regulated to the corresponding opening degree upper limit, and if not, the current opening degree is kept unchanged.
Further, normally, the duty ratio of the regulating valve is regulated by controlling the input signal voltage or the input signal current of the regulating valve, and the opening degree of the regulating valve is further regulated, so that a database of different pressure sections and different input signal voltage upper limits can be established, and the corresponding input signal voltage upper limit can be obtained according to the pressure section to which the current pressure in the smoke exhaust channel belongs, or a database of different pressure sections and different input signal current upper limits can also be established.
The applicant finds that the wind pressure closing value corresponding to the existing unit is fixed, and meanwhile, the value of the wind pressure closing value is required to meet the safety closing of the unit under full load, so that the value is large, the unit is easily subjected to error protection in the operation process, in addition, when a smoke exhaust pipe is lengthened or devices such as a pressure switch and the like are used for a period of time, pressure deviation or pressure detection deviation can be caused, and therefore fault false alarm is very easily caused to cause error protection. Based on this, in the present application, the different pressure sections have the lowest pressure value, that is, when the pressure in the smoke exhaust channel is higher than the lowest pressure value, the flow rate of the intake air is adjusted according to the method described above, and when the pressure in the smoke exhaust channel is equal to or lower than the lowest pressure value, it indicates that the smoke exhaust channel is blocked seriously, and at this time, the control closes the device, or when the pressure in the smoke exhaust channel is equal to or lower than the opening degree of the regulating valve corresponding to the lowest pressure value, the opening degree of the regulating valve is a predetermined opening degree, and when the opening degree of the regulating valve is determined to be the predetermined opening degree. Namely, when the degree of pressure reduction is less, the operation of turning down the air intake flow is carried out first to guarantee that the combustion is complete, and when the degree of pressure reduction is great, the equipment is closed again, so that the equipment can be effectively prevented from being closed at the initial stage of pressure reduction, and the use comfort of a user is improved.
Among them, the minimum pressure value is 40 to 60Pa, more preferably 50Pa, and the predetermined opening degree is 80% to 90%, more preferably 85%.
In a specific embodiment, the correspondence between the different pressure ranges and the pressure values of the input signal is shown in the following table, with reference to fig. 1.
Thus, when the detected pressure is in the range of the serial number 1, the control device is shut down for protection, when the detected pressure is in other ranges, whether the input signal voltage is higher than the corresponding voltage given in the list is judged, if yes, the input signal voltage is reduced to the corresponding voltage in the list, and if not, the voltage is maintained unchanged. Specifically, as shown in fig. 2, when the pressure in the smoke exhaust channel changes, the database is queried, the corresponding upper limit of the input signal voltage is obtained according to the pressure interval to which the current pressure belongs, the current input signal voltage is compared with the upper limit of the input signal voltage, the input signal voltage is adjusted according to the comparison result, and whether the adjusted input signal voltage is U or not is determined00If so, judging that the equipment is in fault, and closing the equipment, otherwise, controlling the unit to normally operate, and naturally, understanding that if the obtained corresponding input signal voltage upper limit is U00In this case, the input signal voltage may not be modified, but the device may be directly determined to be a device failure and shut down.
Furthermore, the gas heating equipment also comprises an airflow driving device for driving airflow in the smoke exhaust channel to flow, and after the equipment is started,firstly, starting the air flow driving device, detecting the current pressure in the smoke exhaust channel, and if the current pressure is equal to or lower than the minimum pressure value, or the opening upper limit of the regulating valve obtained according to the current pressure is a preset opening, namely the corresponding input signal pressure is U00When the gas heating device is started, the combustion part is not started, but shutdown protection is directly carried out, and an alarm is given, otherwise, the combustion part is normally started, and the gas heating device is controlled to normally work. Therefore, when the smoke exhaust channel is seriously blocked, the combustion part can not be opened, thereby prolonging the service life of the combustion part. The control of the opening and closing of the gas flow driving means and the combustion section is also effected by the control means.
The application provides a gas firing equipment can be for utilizing the gas burning to carry out the equipment of heat supply such as gas water heater, gas heating water heater.
Those skilled in the art will readily appreciate that the above-described preferred embodiments may be freely combined, superimposed, without conflict.
It will be understood that the embodiments described above are illustrative only and not restrictive, and that various obvious and equivalent modifications and substitutions for details described herein may be made by those skilled in the art without departing from the basic principles of the invention.
Claims (8)
1. A control method of a gas heating apparatus, characterized in that the apparatus includes a smoke exhaust passage and a gas intake passage, the control method comprising:
when the gas heating equipment is in a working state, regulating the gas inlet flow of the gas inlet channel by combining the pressure in the smoke exhaust channel;
an adjusting valve for adjusting the air inlet flow is arranged in the gas inlet channel, and the air inlet flow is adjusted by controlling the opening degree of the adjusting valve;
different pressure intervals correspond to different opening upper limits, the corresponding opening upper limit is obtained according to the pressure interval to which the current pressure in the smoke exhaust channel belongs, whether the current opening of the regulating valve is larger than the corresponding opening upper limit is judged, if yes, the current opening of the regulating valve is regulated to the corresponding opening upper limit, and if not, the current opening is kept unchanged;
the different pressure interval has the lowest pressure value,
controlling the apparatus to shut down when the pressure within the flue gas channel is equal to or lower than the minimum pressure value; alternatively, the first and second electrodes may be,
and when the pressure in the smoke exhaust channel is equal to or lower than the minimum pressure value, the corresponding opening degree of the regulating valve is a preset opening degree, and when the opening degree of the regulating valve is judged to be the preset opening degree, the equipment is controlled to be closed.
2. The control method according to claim 1, wherein adjusting the intake air flow rate of the gas intake passage in conjunction with the pressure in the smoke exhaust passage comprises:
and determining the upper flow limit of the intake air flow according to the pressure in the smoke exhaust channel, and controlling the intake air flow of the gas intake channel not to exceed the upper flow limit.
3. The control method according to claim 1, characterized in that the minimum pressure value is 40 to 60 Pa; and/or the presence of a gas in the gas,
the predetermined opening is 80% to 90%.
4. The control method according to one of claims 1 to 3, characterized in that the duty ratio of the regulating valve is adjusted by controlling the input signal voltage or the input signal current of the regulating valve, thereby adjusting the opening degree of the regulating valve, different upper opening degree limits corresponding to different input signal voltage values or input signal current values.
5. The control method according to claim 1 or 3, wherein the apparatus further comprises an airflow driving device for driving airflow in the smoke evacuation channel to flow and a combustion component for combusting gas to supply heat, after the apparatus is started, the airflow driving device is firstly started, the current pressure in the smoke evacuation channel is detected, if the current pressure is equal to or lower than the minimum pressure value, or the upper limit of the opening of the regulating valve obtained according to the current pressure is a preset opening, the combustion component is not started, otherwise, the combustion component is started.
6. A gas heating apparatus controlled using the control method of the gas heating apparatus according to any one of claims 1 to 5, characterized by comprising:
a combustion part for combusting gas to supply heat;
a smoke exhaust channel for exhausting smoke;
a gas inlet passage for supplying gas to the combustion part;
the flow regulating device is used for regulating the air inlet flow of the gas inlet channel;
the pressure detection device is used for detecting the pressure in the smoke exhaust channel;
and the control device is used for controlling the flow regulating device according to the target heating temperature of the gas heating equipment and the pressure detected by the pressure detection device.
7. The gas heating apparatus according to claim 6, further comprising a gas flow driving device for driving a gas flow in said smoke evacuation passage, said control device further controlling opening and closing of said gas flow driving device and said combustion part based on a pressure detected by said pressure detecting device.
8. The gas heating apparatus according to claim 6 or 7, wherein the gas heating apparatus comprises a gas water heater or a gas heating water heater.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201810728660.XA CN108980888B (en) | 2018-07-05 | 2018-07-05 | Gas heating equipment and control method thereof |
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| CN201810728660.XA CN108980888B (en) | 2018-07-05 | 2018-07-05 | Gas heating equipment and control method thereof |
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| CN108980888B true CN108980888B (en) | 2020-03-27 |
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| CN111397214A (en) * | 2019-01-03 | 2020-07-10 | 芜湖美的厨卫电器制造有限公司 | Gas water heater and control method thereof |
| CN113701354B (en) * | 2021-08-11 | 2023-02-21 | 广东万和新电气股份有限公司 | Gas water heater and control method and device thereof |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CA1138299A (en) * | 1978-08-22 | 1982-12-28 | Jan H. Van Der Zee | Gas valve assembly |
| US4188972A (en) * | 1978-08-31 | 1980-02-19 | Honeywell Inc. | Gas valve assembly |
| CN1847731A (en) * | 2005-04-14 | 2006-10-18 | 依玛公司 | Electronic device and method for controlling combustion waste gas discharge especially in boiler |
| CN102080878B (en) * | 2009-11-27 | 2013-05-08 | 海尔集团公司 | Draught fan control method and device of gas equipment |
| CN105465822A (en) * | 2015-12-09 | 2016-04-06 | 深圳粤通新能源环保技术有限公司 | Boiler automatic control system and method |
| CN106524219A (en) * | 2016-12-19 | 2017-03-22 | 大连圣鼎工业装备有限公司 | Environment-friendly automatic control low-index emission gas boiler unit |
| CN106765064A (en) * | 2017-01-09 | 2017-05-31 | 泉州恒兴能源节能技术有限公司 | A kind of reduction pollutant discharge of flame heating furnace |
| CN206904977U (en) * | 2017-06-06 | 2018-01-19 | 佛山市顺德区奇林电气有限公司 | The combustion gas of regulation stability of flow and precision passes through adjusting means |
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