CN211695357U

CN211695357U - Gas combustion equipment

Info

Publication number: CN211695357U
Application number: CN201921868389.6U
Authority: CN
Inventors: 大林利彦; 李茂照; 黄官贤; 梁国荣; 邓丽敏
Original assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Current assignee: Midea Group Co Ltd; Wuhu Midea Kitchen and Bath Appliances Manufacturing Co Ltd
Priority date: 2019-09-30
Filing date: 2019-10-31
Publication date: 2020-10-16
Anticipated expiration: 2029-10-31
Also published as: CN211601074U; CN112577199A; CN112577200A

Abstract

The utility model discloses a gas combustion equipment. This gas combustion apparatus includes: the air supply assembly is used for conveying combustion-supporting gas; the measuring unit is used for measuring the wind speed and at least comprises an actual measuring unit which is arranged at an air inlet or an air outlet of the air supply assembly; a control unit, the actual measurement unit in communication with the control unit. According to the utility model discloses a gas combustion equipment, through setting up the actual measurement unit, can in time, stably, accurately measure combustion-supporting gas's wind speed, improve gas combustion equipment's anti-wind performance to, when the air supply volume changes, can make combustion-supporting gas better with the gas ratio, thereby be favorable to improving gas combustion equipment's burning operating mode, reduce the emission of harmful gas in the gas combustion equipment tail gas.

Description

Gas combustion equipment

Cross Reference to Related Applications

The application claims priority of application date of 2019, 9 and 30, application number of 201921674133.1 and patent application name of "hot water equipment", and priority of application date of 2019, 9 and 30, application number of 201910943633.9 and patent application name of "hot water equipment".

Technical Field

The utility model relates to a gas heater field particularly, relates to a gas combustion equipment.

Background

When the gas combustion equipment (taking a gas water heater as an example) operates, the gas flow can be driven to move, when the external resistance changes, the moving states of the gas flow are different, and the gas flow and the air quantity are correspondingly regulated by monitoring the gas flow state, so that the use comfort, the safety and the wind resistance of the gas water heater can be improved, a good combustion working condition can be ensured, and the emission of harmful gas in tail gas of the gas water heater is reduced.

At present, the gas water heater generally detects the change of the wind speed of a fan through installing a wind pressure sensor or through the current value of a motor, but still has the installation position of the wind pressure sensor and great influence on a measured value due to angle deviation, and the problem that the wind speed precision is not enough is judged through the current value, so that the gas water heater cannot adjust the air supply quantity in real time, further the gas combustion is insufficient, the emission of harmful gas in tail gas is increased, and when the external wind pressure is too large, the problem of potential safety hazards such as tempering can be caused.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at solving one of the above-mentioned technical problem among the prior art to a certain extent at least. Therefore, the utility model provides a gas combustion equipment is favorable to the accurate wind speed of measuring to change to improve gas combustion equipment's anti-wind performance.

According to the utility model discloses gas combustion equipment includes: the air supply assembly is used for conveying combustion-supporting gas; the measuring unit is used for measuring the wind speed and at least comprises an actual measuring unit which is arranged at an air inlet or an air outlet of the air supply assembly; a control unit, the actual measurement unit in communication with the control unit.

According to the utility model discloses a gas combustion equipment, through setting up the actual measurement unit, can be timely, stable, accurately measure combustion-supporting gas's wind speed to be favorable to the size of the real-time air supply volume of adjusting of air supply subassembly, improve gas combustion equipment's anti-wind performance, and, when the air supply volume changes, can make combustion-supporting gas better with the gas ratio, thereby be favorable to improving gas combustion equipment's burning operating mode, reduce harmful gas's emission in the gas combustion equipment tail gas.

According to some embodiments of the present invention, the control unit is connected to the air supply assembly and is used for controlling the air supply volume of the air supply assembly.

Further, the measuring unit has a resistance element that changes with a change in temperature.

Still further, the measuring unit is a thermistor.

Further, the control unit determines the resistance value of the measurement unit based on the voltage value of the measurement unit at a constant current.

Further, the control unit determines a change in the wind speed of the air supply assembly based on a change in the voltage value of the actual measurement unit per unit time in a windy state as compared to a no-wind state.

Further, the control unit determines the wind speed change of the air supply assembly based on the speed of the voltage value change of the actual measurement unit in unit time.

Further, the measurement unit further includes: the comparison measuring unit is communicated with the control unit and used in cooperation with the actual measuring unit, and the comparison measuring unit is arranged at a windless position.

Further, the control unit determines the wind speed change of the air supply assembly based on the voltage value change of the actual measurement unit compared with the comparison measurement unit in unit time.

Further, the gas combustion equipment is a gas water heater or a wall-mounted furnace.

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 schematic view of a gas combustion device with an actual measurement unit at the air inlet and a comparative measurement unit;

FIG. 2 is a schematic view of a gas combustion device with an actual measurement unit at an air outlet and a comparison measurement unit;

FIG. 3 is a schematic view of the inlet or outlet being airless;

fig. 4 is a schematic view of wind in the air inlet or outlet.

Reference numerals:

the device comprises an air supply assembly 1, an actual measurement unit 2, a control unit 3, a comparison measurement unit 4 and a gas combustion device 10.

Detailed Description

Reference will now be made in detail to embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like reference numerals refer to the same or similar elements or elements having the same or similar function throughout. The embodiments described below with reference to the drawings are exemplary and intended to be used for explaining the present invention, and should not be construed as limiting the present invention.

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 one or more of that feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; can be mechanically connected, electrically connected or can communicate with each other; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

A gas combustion device 10 according to an embodiment of the present invention is described in detail below with reference to fig. 1 to 4.

Referring to fig. 1 to 4, the gas combustion apparatus 10 may include: air supply assembly 1, measuring unit, control unit 3.

The air supply assembly 1 is used for conveying combustion-supporting gas, and ensures that mixed gas of the combustion-supporting gas and fuel gas can be combusted in the combustor, so that water in the heat exchanger is heated. The air supply assembly 1 can be a fan, and the air supply quantity of air entering the gas combustion device 10 can be controlled by changing the power of the fan.

The measuring unit can be used for measuring the wind speed, the measuring unit at least comprises an actual measuring unit 2, the actual measuring unit 2 is arranged at an air inlet or an air outlet of the air supply assembly 1, and the actual measuring unit 2 is placed at the air inlet or the air outlet of the air supply assembly 1 or at a non-turbulent position such as an air suction inlet and is contacted with flowing gas to measure the wind speed. And the actual measurement unit 2 is arranged near the air inlet or the air outlet, namely near the air supply assembly 1, which is beneficial to improving the detection precision of the actual measurement unit 2 to the wind speed.

The actual measurement unit 2 communicates with the control unit 3, the actual measurement unit 2 can feed the wind speed measurement result back to the control unit 3, and the air supply assembly 1 takes corresponding measures according to the wind speed measurement result.

Specifically, under the same power of the fan, when the flue of the gas combustion device 10 is blocked or the external wind pressure is too large, the wind speed at the wind inlet is reduced, so that the wind output is reduced, further, the gas is not fully combusted, a large amount of harmful gas is generated after combustion, and dangerous situations such as tempering and the like can occur, the actual measurement unit 2 can detect that the wind speed of the air inlet or the air outlet is reduced and feed back to the control unit 3, the gas combustion equipment 10 can improve the power of the fan in real time and increase the wind speed of the air inlet or the air outlet until the wind speed is restored to a target wind speed value, so that the air supply component 1 can adjust the air supply quantity in real time according to the wind speed measurement result, further, the combustion condition of the gas combustion equipment 10 is improved, incomplete combustion of gas is reduced, the emission of harmful gas in tail gas of the gas combustion equipment 10 is reduced, and the wind resistance of the gas combustion equipment 10 is improved.

In addition, when the actual measurement unit 2 detects that the wind speed of the air inlet or the air outlet is increased, the wind speed increase signal can be fed back to the control unit 3, the gas combustion equipment 10 reduces the power of the fan in real time, and reduces the wind speed of the air inlet or the air outlet until the wind speed returns to the target wind speed value, so that the energy waste of the fan is avoided.

According to the utility model discloses a gas combustion equipment 10, through setting up actual measurement unit 2, can be timely, stable, accurately measure combustion-supporting gas's wind speed, improve gas combustion equipment 10's anti-wind performance to, when the air supply volume changes, can make combustion-supporting gas better with the gas ratio, thereby be favorable to improving the burning operating mode of gas combustion equipment 10, reduce harmful gas's emission in the gas combustion equipment 10 tail gas.

Further, the control unit 3 links to each other with air supply subassembly 1, and the control unit 3 is used for controlling the air supply volume of air supply subassembly 1, and the power of the steerable fan of control unit 3 to the air supply volume of control air supply subassembly 1 promotes the wind resistance of gas combustion equipment 10, and then improves the burning operating mode of gas combustion equipment 10, improves combustion efficiency.

The measuring unit has a resistance element that changes with temperature changes. When the wind speed changes, the resistance value of the resistance element changes, and the change of the resistance value is fed back to the control unit 3, so that the control unit 3 can adjust the air supply assembly 1 to change the air supply amount of the air supply assembly 1.

Alternatively, the resistance element may have a larger resistance value at a higher temperature, and the resistance element may have a smaller resistance value at a higher temperature.

Preferably, the measuring unit may be a thermistor. The thermistor may be a positive temperature coefficient thermistor or a negative temperature coefficient thermistor. For convenience of description, in the embodiments of the present invention, the actual measuring unit 2 is exemplified as a positive temperature coefficient thermistor. It should be noted that any sensor whose resistance value changes with temperature may be regarded as a "thermistor" according to the present invention.

The thermistor is simple and convenient to mount, the mounting directivity of the thermistor is not greatly limited, and no obvious measurement error is generated on the measurement result of the thermistor when the thermistor is parallel to or perpendicular to the wind direction. The thermistor has high sensitivity and high detection precision, and can judge the change of the wind speed in time and feed the change back to the control unit 3. And the thermistor has good stability and long service life. In addition, the thermistor has small volume and small occupied space, and can be flexibly installed.

In some embodiments, the control unit 3 determines the resistance value of the measurement unit based on the voltage value of the measurement unit at a constant current.

According to ohm's law, when the current value is constant, the voltage value at the two ends of the resistance element is in direct proportion to the resistance value, the control unit 3 outputs a constant current to the measuring unit, and the measuring unit feeds back a voltage signal to the control unit 3. When the temperature of the measuring unit changes, the voltage value fed back by the measuring unit also changes, and the change of the resistance value of the measuring unit can be known according to the change of the voltage value.

In other words, when the wind at the air inlet or the air outlet blows through the measuring unit, the wind blows to dissipate heat, the temperature of the measuring unit changes, the voltage signal fed back to the control unit 3 changes accordingly, and the voltage change degrees caused by different wind speeds are different.

Referring to fig. 3 to 4, the control unit 3 determines a change in the wind speed of the air supply assembly 1 based on a change in the voltage value of the wind state actual measurement unit 2 per unit time as compared to the no-wind state actual measurement unit 2.

When wind at the air inlet or the air outlet blows through the thermistor, the wind exchanges heat with the actual measuring unit 2, the temperature of the actual measuring unit 2 changes, and further the voltage of the actual measuring unit 2 changes, in other words, the control unit 3 can determine the change of the wind speed by measuring the voltage value change of the wind state and the no-wind state of the actual measuring unit 2.

For example, the voltage value of the actual measurement unit 2 in the windless state is U1, the voltage value of the actual measurement unit 2 after the wind blows in the unit time in the first wind speed state is U2, the voltage value of the actual measurement unit 2 after the wind blows in the unit time in the second wind speed state is U3, and if U1-U2 is less than U1-U3, that is, U2 > U3, it is indicated that the resistance value is greatly reduced in the second wind speed state, and the wind speed in the second wind speed state is greater than the wind speed in the first wind speed state.

In some alternative embodiments, the control unit 3 determines the wind speed variation of the air supply assembly 1 based on how fast the voltage value of the actual measurement unit 2 varies per unit time. For example, the initial voltage value of the actual measurement unit 2 is U4, the voltage value variation of the actual measurement unit 2 is Δ U5 after the wind blows in the unit time in the first wind speed state, the voltage value variation of the actual measurement unit 2 is Δ U6 after the wind blows in the unit time in the second wind speed state, and if Δ U6 > Δu5, it is described that the resistance value is greatly decreased in the second wind speed state, and the wind speed in the second wind speed state is higher than the wind speed in the first wind speed state.

Specifically, the higher the wind speed, the faster the heat exchange, the faster the thermistor temperature change speed, and the faster the voltage change of the actual measurement unit 2 per unit time; the lower the wind speed, the slower the heat exchange, the slower the thermistor temperature change speed, and the slower the voltage change of the actual measuring unit 2 per unit time, in other words, the control unit 3 can determine the amount of change of the wind speed by measuring the speed of the change of the voltage of the actual measuring unit 2.

Referring to fig. 1-2, in other embodiments of the present invention, the measurement unit further includes: and the comparison measuring unit 4 is communicated with the control unit 3, the comparison measuring unit 4 is matched with the actual measuring unit 2 for use, and the comparison measuring unit 4 is arranged at a windless position.

The comparison measuring unit 4 may be a thermistor of the same type as the actual measuring unit 2, and the comparison measuring unit 4 is placed in a windless area where air flows little and the air flow is stable. Because the comparison measuring unit 4 is not influenced by air inlet or air outlet, the temperature is stable, the resistance value is stable, and the voltage signal fed back to the control unit 3 is stable. The wind speed is judged by comparing the voltage signal difference of the actual measuring unit 2 and the voltage signal difference of the measuring unit 4.

Further, the control unit 3 determines the wind speed change of the blowing assembly 1 based on the voltage value change of the actual measuring unit 2 compared to the measuring unit 4 per unit time.

Specifically, the voltage difference of the actual measurement unit 2 compared with the measurement unit 4 is larger, which indicates that the wind speed at the air inlet or the air outlet is larger, and the voltage difference of the actual measurement unit 2 compared with the measurement unit 4 is smaller, which indicates that the wind speed at the air inlet or the air outlet is smaller.

For example, the voltage value of the comparison measurement unit 4 is U7, the voltage value of the actual measurement unit 2 is U8 after the wind blows in unit time in the first wind speed state, the voltage value of the actual measurement unit 2 is U9 after the wind blows in unit time in the second wind speed state, if U7-U8 is less than U7-U9, that is, U8 is greater than U9, it is indicated that the resistance value is greatly reduced in the second wind speed state, and the wind speed in the second wind speed state is greater than the wind speed in the first wind speed state.

In some embodiments, the gas combustion device 10 is a gas water heater or a wall-hanging stove.

In some embodiments, not shown, a component can be heated by current, and heat of the component is transferred to the thermistor through the heat-conducting medium, so that the temperature of the thermistor is always higher than the temperature of air outside the gas water heater or the wall-mounted boiler, and therefore the flowing air is used for carrying away heat to measure the temperature.

In the description herein, references to the description of the term "one embodiment," "some embodiments," "an example," "a specific example" or "some examples" or the like are intended to mean 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 are not necessarily intended to 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, various embodiments or examples described in this specification can be combined and combined by those skilled in the art.

Although embodiments of the present invention have been shown and described, 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 without departing from the scope of the present invention.

Claims

1. A gas combustion device, characterized by comprising:

the air supply assembly is used for conveying combustion-supporting gas;

the measuring unit is used for measuring the wind speed and at least comprises an actual measuring unit which is arranged at an air inlet or an air outlet of the air supply assembly;

a control unit, the actual measurement unit in communication with the control unit.

2. The gas combustion device as claimed in claim 1, wherein the control unit is connected to the air supply assembly and controls an air supply amount of the air supply assembly.

3. Gas combustion device according to claim 2, wherein said measuring unit has a resistance element that varies with temperature variations.

4. Gas combustion device according to claim 3, wherein said measuring unit is a thermistor.

5. Gas combustion device according to any of claims 1-4, wherein the control unit determines the resistance value of the measuring unit based on the voltage value of the measuring unit at constant current.

6. The gas combustion device as claimed in claim 5, wherein the control unit determines a change in the wind speed of the air supply assembly based on a change in a voltage value of the actual measurement unit per unit time in a windy state as compared to a windless state.

7. The gas combustion device as claimed in claim 5, wherein said control unit determines the change of the wind speed of said blowing assembly based on the speed of change of the voltage value of said actual measuring unit per unit time.

8. The gas combustion device according to claim 5, wherein said measuring unit further comprises: the comparison measuring unit is communicated with the control unit and used in cooperation with the actual measuring unit, and the comparison measuring unit is arranged at a windless position.

9. The gas combustion device according to claim 8, wherein the control unit determines a change in the wind speed of the air supply assembly based on a change in a voltage value of the actual measurement unit compared to the comparison measurement unit per unit time.

10. Gas combustion device according to claim 1, characterized in that it is a gas water heater or a wall-hanging stove.