A flue, a gas water heater and a control method thereof

Abstract

The application discloses a smoke exhaust pipe, a gas water heater and a control method thereof. The smoke exhaust pipe comprises a smoke exhaust pipeline and a wind direction and speed sensor. The wind direction and speed sensor is arranged in the smoke exhaust pipeline. The wind direction and speed sensor comprises a fan blade and a plurality of magnetic sensors. The plurality of magnetic sensors are sequentially distributed on the periphery of the fan blade in a circumferential direction. The fan blade comprises a plurality of blades which are distributed in a circumferential direction at intervals. At least one of the blades is made of magnetizable metal and is magnetized. The structure is simple, the installation is convenient, and the detection is accurate.

Description

Technical Field

[0001] This invention relates to the field of gas water heater technology, and in particular to a flue pipe, a gas water heater, and a control method thereof. Background Technology

[0002] In related technologies, gas water heaters produce a large amount of exhaust gas and harmful gases from incomplete combustion during operation, so an exhaust fan must be used to vent them outdoors through the flue. However, if the outdoor wind is too strong, the exhaust gas may not be able to escape outdoors, and there is even a possibility that outdoor wind may flow back into the room. Currently, most gas water heaters use a wind pressure sensor installed inside the heater to sense the pressure inside the flue and adjust the exhaust fan speed accordingly.

[0003] Wind pressure sensors have certain drawbacks. First, they are inconvenient to install, as they are installed inside gas water heaters and require a flow guide device to guide the air from the flue. Second, the wind pressure sensor readings are related to the installation location and the flow guide device, which can easily lead to misjudgments. Summary of the Invention

[0004] The present invention aims to at least partially solve one of the problems existing in the prior art. To this end, one objective of the present invention is to provide a smoke exhaust pipe that is simple in structure, easy to install, and accurate in detection.

[0005] The above objective is achieved through the following technical solution:

[0006] A smoke exhaust pipe includes a smoke exhaust duct and a wind direction and speed sensor, wherein the wind direction and speed sensor is disposed inside the smoke exhaust duct, the wind direction and speed sensor includes a fan blade and a plurality of magnetic sensors, the plurality of magnetic sensors being sequentially distributed around the fan blade in a circumferential direction, the fan blade including blades spaced apart in a circumferential direction, wherein at least one of the blades is made of a magnetizable metal and the blade is magnetized.

[0007] In some embodiments, the wind direction and speed sensor includes a ring-shaped frame, the wind blades are rotatably disposed within the frame, and a plurality of magnetic sensors are sequentially distributed on the frame in a circumferential direction.

[0008] In some embodiments, a support is provided within the frame, and the fan blades are rotatably mounted on the support.

[0009] In some embodiments, the blade surface is planar.

[0010] In some embodiments, the blades are arranged at an angle to the central axis of the wind turbine.

[0011] In some embodiments, the magnetic sensor comprises three.

[0012] In some embodiments, the wind direction and speed sensor is located at the outlet or middle section of the smoke exhaust duct.

[0013] In addition, another objective of this invention is to provide a gas water heater that can detect whether there is backdraft or poor exhaust in the gas water heater, thereby ensuring safe use of the gas water heater.

[0014] The above objective is achieved through the following technical solution:

[0015] A gas water heater includes a water heater body and a flue pipe as described above, wherein the inlet of the flue pipe is connected to the flue outlet of the water heater body.

[0016] Another objective of this invention is to provide a control method for a gas water heater that can detect whether the gas water heater has backdraft or poor exhaust, thereby ensuring the safe use of the gas water heater.

[0017] The above objective is achieved through the following technical solution:

[0018] A control method for a gas water heater, applied to the gas water heater as described above, the control method comprising the following steps:

[0019] S1, turn on the gas water heater and turn on the exhaust fan for ventilation;

[0020] S2, detect the direction of the wind vane of the wind direction and speed sensor. If the direction of the wind vane is the first preset direction, it is determined that the pressure of the exhaust fan is greater than the pressure on the outside side and proceeds to step S3. If the direction of the wind vane is the second preset direction, it is determined that the pressure on the outside side is greater than the pressure of the exhaust fan and proceeds to step S4.

[0021] S3, determine whether the fan speed of the wind direction and speed sensor is greater than the first preset speed. If yes, control the gas water heater to work normally. If no, proceed to step S5.

[0022] S4, increase the exhaust fan speed;

[0023] S5 increases the exhaust fan speed.

[0024] In some implementations, step S5 includes:

[0025] Determine whether the exhaust fan speed has reached the maximum speed. If not, proceed to step S3. If yes, determine whether the fan speed of the wind direction and speed sensor is less than the second preset speed. If yes, stop starting the machine. If not, start the gas water heater with low gas volume. The second preset speed is less than the first preset speed.

[0026] In some implementations, step S4 includes:

[0027] Determine if the exhaust fan speed has reached its maximum speed. If not, continue to increase the exhaust fan speed; if so, stop the machine.

[0028] Compared with the prior art, the present invention has at least the following beneficial effects:

[0029] 1. The exhaust pipe of the present invention has a simple structure, is easy to install, and is accurate in testing.

[0030] 2. The gas water heater of the present invention can detect whether there is backdraft or poor exhaust of the gas water heater, ensuring safe use of the gas water heater.

[0031] 3. The control method for the gas water heater of the present invention can detect whether there is backdraft or poor smoke exhaust in the gas water heater, so as to ensure safe use of the gas water heater. Attached Figure Description

[0032] Figure 1 This is a front view of the exhaust pipe in an embodiment of the present invention;

[0033] Figure 2 This is a side view of the exhaust pipe in an embodiment of the present invention;

[0034] Figure 3 This is a schematic diagram of the structure of the wind direction and wind speed sensor in an embodiment of the present invention;

[0035] Figure 4 This is a flowchart illustrating the control method in an embodiment of the present invention. Detailed Implementation

[0036] The following embodiments illustrate the present invention, but the present invention is not limited to these embodiments. Modifications to the specific embodiments of the present invention or equivalent substitutions for some technical features, without departing from the spirit of the present invention, should all be covered within the scope of the technical solutions claimed in the present invention.

[0037] Example 1: As Figure 1 , Figure 2 and Figure 3As shown, this embodiment provides a smoke exhaust pipe, including a smoke exhaust duct 1 and a wind direction and speed sensor 2. The wind direction and speed sensor 2 is disposed inside the smoke exhaust duct 1. Preferably, the wind direction and speed sensor 22 is disposed at the outlet or middle section of the smoke exhaust duct 1 by screws 3. The wind direction and speed sensor 2 includes a fan blade 21 and multiple magnetic sensors 22. The multiple magnetic sensors 22 are sequentially distributed around the fan blade 21 in a circumferential direction. The fan blade 21 includes blades 211 distributed at intervals in a circumferential direction, wherein at least one blade 211 is made of a magnetizable metal and is magnetized. By magnetizing one or more blades 211, the magnetic field reaches a certain strength. The magnetic sensors 22 are sequentially distributed around the blades 211, and the distance between them and the blades 211 meets the magnetic induction requirements. Each magnetic sensor 22 has a signal line led out to output a magnetic induction signal.

[0038] The exhaust pipe in this embodiment has a simple structure, is easy to install, and is accurate in testing.

[0039] Specifically, since at least one blade 211 is made of magnetizable metal and is magnetized, it generates a magnetic field of a certain strength. Multiple magnetic sensors 22 are installed on the periphery of the fan blade 21. When the outdoor air pressure is greater than the exhaust air pressure of the gas water heater, the fan blade 21 rotates clockwise, and the magnetic sensors 22 will sense the rotation of the fan blade 21 and output a clockwise sensing signal. When the exhaust air pressure is greater than the outdoor air pressure, the fan blade 21 rotates counterclockwise, and the magnetic sensors 22 will sense the rotation of the fan blade 21 and output a counterclockwise sensing signal. The higher the frequency of the output signal, the faster the rotation speed and the greater the air pressure difference. Combined with the main controller of the gas water heater, functions such as adjusting the exhaust fan speed, adjusting the firepower, or forced shutdown protection can be performed.

[0040] The exhaust pipe provided in this embodiment can detect whether the gas water heater has backdraft or poor exhaust, ensuring safe use of the gas water heater.

[0041] Furthermore, the wind direction and speed sensor 2 includes a ring-shaped frame 23, with the fan blades 21 rotatably mounted within the frame 23. Multiple magnetic sensors 22 are sequentially distributed circumferentially on the frame 23. Its structure is simple, rationally and ingeniously designed, facilitating the installation and fixation of the magnetic sensors 22. The frame 23 also allows for convenient fixation of the wind direction and speed sensor 2 within the exhaust duct 1. In this embodiment, the frame 23 is fixed to the exhaust duct 1 using screws 3.

[0042] Preferably, a bracket 24 is provided within the frame 23, and the fan blade 21 is rotatably mounted on the bracket 24. This design is simple, reasonable, and ingenious, and the bracket 24 facilitates the installation and fixation of the fan blade 21. In this embodiment, the fan blade 21 and the bracket 24 are connected by a bearing, thereby ensuring the smooth rotation of the fan blade 21.

[0043] In this embodiment, the surface of the blade 211 is planar, which allows the blade 211 to rotate easily and smoothly regardless of whether it is subjected to forward or reverse wind force, thereby improving the accuracy of detection.

[0044] Preferably, the blade 211 is inclined to the central axis of the wind turbine 21. Its structure is simple, reasonable and ingenious, so that the blade 211 can rotate easily and smoothly regardless of whether it is subjected to forward or reverse wind force, thereby improving the accuracy of detection.

[0045] In this embodiment, there are three magnetic sensors, such as magnetic sensors 22A, 22B, and 22C arranged in a clockwise order. When the gas water heater is working normally and the exhaust fan is turned on, when the outdoor wind pressure is less than the exhaust fan wind pressure, the air discharged by the indoor exhaust fan will push the blades 211 on the wind direction and speed sensor 2, causing the blades 211 to rotate clockwise. At this time, magnetic sensors 22A, 22B, and 22C respectively sense the magnetic field of the blades 211, and the output signal sequence is 22A, 22B, 22C, 22A, 22B...; the higher the signal frequency, the higher the rotation speed and the greater the wind pressure difference.

[0046] When strong winds occur outdoors, such as during a typhoon, the outdoor crosswind pressure is greater than the indoor exhaust fan pressure. At this time, the outdoor crosswind will push the blades 211 on the wind direction and speed sensor 2, causing the blades 211 to rotate counterclockwise. At this time, the magnetic sensors 22C, 22B, and 22A respectively sense the magnetic field of the blades 211, and the output signals are in the order of 22C, 22B, 22A, 22C, 22B... The higher the signal frequency, the higher the rotation speed and the greater the wind pressure difference.

[0047] When the indoor fan is damaged or the exhaust pipe is blocked, the blades will rotate at a very low speed or stop completely due to the lack of air pressure indoors. At this time, the water heater controller can be controlled to sound an alarm or stop working to ensure safety.

[0048] Example 2: Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a gas water heater, including a water heater body and a flue pipe as described in Embodiment 1, wherein the inlet of the flue pipe is connected to the flue outlet of the water heater body.

[0049] The gas water heater in this embodiment can detect whether there is backdraft or poor smoke exhaust, ensuring safe use of the gas water heater.

[0050] Example 3: Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, this embodiment provides a control method for a gas water heater, applied to the gas water heater described in Embodiment 2. The control method includes the following steps:

[0051] S1, turn on the gas water heater and turn on the exhaust fan for ventilation;

[0052] S2, detect the direction of the wind vane of the wind direction and speed sensor. If the direction of the wind vane is the first preset direction, it is determined that the pressure of the exhaust fan is greater than the pressure on the outside side and proceeds to step S3. If the direction of the wind vane is the second preset direction, it is determined that the pressure on the outside side is greater than the pressure of the exhaust fan and proceeds to step S4.

[0053] S3, determine whether the fan speed of the wind direction and speed sensor is greater than the first preset speed. If yes, control the gas water heater to work normally. If no, proceed to step S5.

[0054] S4, increase the exhaust fan speed and return to step S2;

[0055] S5 increases the exhaust fan speed.

[0056] The control method for a gas water heater of the present invention can detect whether there is backdraft or poor exhaust of the gas water heater, thus ensuring safe use of the gas water heater.

[0057] Specifically, step S5 includes:

[0058] Determine whether the exhaust fan speed has reached the maximum speed. If not, proceed to step S3. If yes, determine whether the fan speed of the wind direction and speed sensor is less than the second preset speed. If yes, stop starting the machine. If not, start the gas water heater with low gas volume. The second preset speed is less than the first preset speed. In this embodiment, the first preset speed is 500 rpm and the second preset speed is 300 rpm.

[0059] Furthermore, step S4 includes:

[0060] Determine if the exhaust fan speed has reached its maximum speed. If not, continue to increase the exhaust fan speed; if so, stop the machine.

[0061] In this embodiment, when the gas water heater starts working, the internal exhaust system is activated. If there is no wind pressure outside, the exhaust fan pressure is greater than the outdoor pressure. At this time, the blades 211 on the wind direction and speed sensor 2 are pushed by the indoor wind pressure, and the blades 211 will rotate clockwise. At this time, the pulse signals received by the MCU controller are 22A, 22B, 22C, 22A, 22B... The higher the signal frequency, the higher the rotation speed and the greater the wind pressure difference. In the whole machine test, when the rotation speed is greater than 500 rpm, it is considered that the internal exhaust system can completely exhaust the waste produced by combustion to the outdoor side, and the gas water heater can be safely started.

[0062] When the detection pulse is clockwise but the speed is less than 500 rpm, it is determined that the outdoor pressure is too high and the air pressure of the internal exhaust system is insufficient to completely exhaust the exhaust gas. At this time, the MCU controller controls the exhaust fan speed of the internal exhaust system to increase the internal exhaust pressure and continuously accelerate until the fan speed on the wind direction and wind speed sensor 2 is higher than 500 rpm before starting the gas valve and ignition of the water heater.

[0063] If the speed continues to increase until the set maximum speed limit of the exhaust fan, but the fan speed on the wind direction and speed sensor 2 still does not reach 500 rpm, but is greater than the set 300 rpm, it is considered to be in a risky state. The gas water heater can be used with reduced gas volume and reduced water temperature, but the display screen will issue an alarm to remind the user.

[0064] If the fan speed continues to increase until it reaches its maximum limit, but the fan speed on the wind direction and speed sensor 2 is still below 300 rpm, it is determined that the outdoor pressure is too high or the internal exhaust system is faulty. The MCU controller will not allow the water heater gas valve and ignition to start working and will issue an alarm on the display screen to remind the user not to use the water heater.

[0065] When the gas water heater starts working, the internal exhaust system is activated. The wind direction and speed sensor 2 outputs signals 22C, 22B, 22A, 22C, 22B... At this time, it is determined that there is a large wind pressure outside. The MCU controller will control the exhaust fan to accelerate. If the exhaust fan speed reaches the maximum speed limit, but the fan blade 21 on the wind direction and speed sensor 2 is still rotating counterclockwise, the MCU controller will cut off the gas valve and alarm on the display screen, reminding the user not to use the gas water heater.

[0066] The above descriptions are merely some embodiments of the present invention. Those skilled in the art can make various modifications and improvements without departing from the inventive concept of the present invention, and these all fall within the scope of protection of the present invention.

Claims

1. A smoke exhaust pipe, characterized in that, The system includes a smoke exhaust duct (1) and a wind direction and speed sensor (2), wherein the wind direction and speed sensor (2) is disposed inside the smoke exhaust duct (1). The wind direction and speed sensor (2) includes a fan blade (21) and a plurality of magnetic sensors (22). The plurality of magnetic sensors (22) are sequentially distributed circumferentially around the fan blade (21). The fan blade (21) includes blades (211) spaced circumferentially, wherein at least one blade (211) is made of a magnetizable metal and is magnetized. The magnetic sensors (22) are sequentially distributed around the fan blade. The periphery of the blade (211) and the distance between it and the blade (211) meet the magnetic induction requirements. Each of the magnetic sensors (22) leads out a signal line and outputs a magnetic induction signal. When the gas water heater is working normally and the exhaust fan is turned on, when the outdoor wind pressure is less than the wind pressure of the exhaust fan, the wind discharged by the exhaust fan will push the blade (211) on the wind speed sensor (2) to rotate the blade (211) clockwise. At this time, multiple magnetic sensors (22) respectively sense the magnetic field of the blade 211 and output magnetic field signals in the clockwise direction. When the outdoor wind pressure is greater than the exhaust fan wind pressure, the outdoor wind will push the blade (211) on the wind speed sensor (2) to rotate counterclockwise. At this time, multiple magnetic sensors (22) will sense the magnetic field of the blade (211) and output magnetic field signals in the counterclockwise direction.

2. A smoke exhaust pipe according to claim 1, characterized in that, The wind direction and speed sensor (2) includes a ring-shaped frame (23), the wind blade (21) is rotatably disposed within the frame (23), and a plurality of magnetic sensors (22) are sequentially distributed on the frame (23) along the circumference.

3. A smoke exhaust pipe according to claim 2, characterized in that, A bracket (24) is provided inside the frame (23), and the fan blade (21) is rotatably mounted on the bracket (24).

4. A smoke exhaust pipe according to claim 1, 2 or 3, characterized in that, The surface of the blade (211) is planar.

5. A smoke exhaust pipe according to claim 4, characterized in that, The blade (211) is inclined to the central axis of the wind vane (21).

6. A smoke exhaust pipe according to claim 1, 2 or 3, characterized in that, The wind direction and speed sensor (22) is located at the outlet or middle section of the smoke exhaust duct (1).

7. A gas water heater, characterized in that, It includes a water heater body and a flue pipe as described in any one of claims 1-6, wherein the inlet of the flue pipe is connected to the flue outlet of the water heater body.

8. A control method for a gas water heater, characterized in that, Applied to the gas water heater as described in claim 7, The control method includes the following steps: S1, turn on the gas water heater and turn on the exhaust fan for ventilation; S2, detect the direction of the wind vane of the wind direction and speed sensor. If the direction of the wind vane is the first preset direction, it is determined that the pressure of the exhaust fan is greater than the pressure on the outside side and proceeds to step S3. If the direction of the wind vane is the second preset direction, it is determined that the pressure on the outside side is greater than the pressure of the exhaust fan and proceeds to step S4. S3, determine whether the fan speed of the wind direction and speed sensor is greater than the first preset speed. If yes, control the gas water heater to work normally. If no, proceed to step S5. S4, increases the exhaust fan speed; S5 increases the exhaust fan speed.

9. The control method for a gas water heater according to claim 8, characterized in that, Step S5 includes: Determine whether the exhaust fan speed has reached the maximum speed. If not, proceed to step S3. If yes, determine whether the fan speed of the wind direction and speed sensor is less than the second preset speed. If yes, stop starting the machine. If not, start the gas water heater with low gas volume. The second preset speed is less than the first preset speed.

10. A control method for a gas water heater according to claim 8, characterized in that, Step S4 includes: Determine if the exhaust fan speed has reached its maximum speed. If not, continue to increase the exhaust fan speed; if so, stop the machine.

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