Flame detector

Abstract

The invention relates to a flame detector, which comprises a shell, a flame sensor, a circuit board and a power supply assembly, and is characterized in that the shell is used for being connected with a boiler; the flame sensor is located in the shell and used for generating an electric signal according to the flame condition in the boiler. The circuit board is installed at the end, away from the flame sensor, in the shell and electrically connected with the flame sensor. The power supply assembly comprises a photovoltaic cell panel, the photovoltaic cell panel is installed at the end, away from the flame sensor, in the shell, the circuit board and the flame sensor are both electrically connected with the photovoltaic cell panel, and a light inlet is formed in the side, close to the flame sensor, of the shell. The detector has the advantages that when external power failure occurs or an external power supply breaks down, the photovoltaic cell panel supplies power to the flame sensor and the circuit board, so that the detector can still work normally when the external power supply breaks down, and the reliability of the detector is improved.

Description

Technical Field

[0001] The present application relates to the field of flame combustion detection, and in particular to a flame detector. Background Art

[0002] A flame detector is a device used to monitor the combustion status of a flame. It can detect the presence, intensity, stability, and abnormal conditions of a flame, such as flame interruption or abnormal combustion, and can be used to monitor the flame conditions in the boiler combustion chamber.

[0003] There is an integrated flame detector in the prior art, which includes a housing, a flame sensor and a circuit board. The flame sensor and the circuit board are installed inside the housing. The flame sensor is used to generate an electrical signal according to the flame condition. The circuit board and the flame detector are connected to an external power supply.

[0004] With respect to the above-mentioned related technologies, during the operation of the flame detector, if the external power supply connected to the circuit board and the flame detector fails, the flame sensor and the circuit board may not work properly, thereby reducing the reliability of the detector. Summary of the invention

[0005] In order to improve the reliability of the detector, the present application provides a flame detector.

[0006] The flame detector provided in this application adopts the following technical solution: A flame detector, comprising: A shell, the shell being used to be connected to a boiler; A flame sensor, the flame sensor is located inside the housing and is used to generate an electrical signal according to the flame condition in the boiler; A circuit board, the circuit board is installed in the housing at one end away from the flame sensor, and the circuit board is electrically connected to the flame sensor; The power supply component includes a photovoltaic cell panel, which is installed inside the shell at one end away from the flame sensor. The circuit board and the flame sensor are electrically connected to the photovoltaic cell panel. A light inlet is provided on one side of the shell close to the flame sensor.

[0007] By adopting the above technical solution, when the flame detector is working, the flame detector is connected to the boiler through the shell, so that the flame sensor faces the inside of the boiler to monitor the flame combustion state in the boiler. When the flame intensity changes, the flame sensor transmits the signal to the circuit board. After the circuit board receives the signal from the flame sensor, it processes and analyzes the signal. During the flame combustion process in the boiler, visible light enters the shell through the light inlet and is absorbed by the photovoltaic panel and converted into electrical energy. When the external power supply fails, the photovoltaic panel supplies power to the flame sensor and the circuit board, so that the detector can still work normally when the external power supply fails, thereby improving the reliability of the detector.

[0008] Optionally, the shell includes an inner shell, the circuit board and the photovoltaic panel are both located inside the inner shell, the outer shell is disposed outside the inner shell, a cooling chamber is formed between the inner shell and the outer shell, and a cooling component for cooling the interior of the shell is provided in the cooling chamber.

[0009] By adopting the above technical solution, when the flame detector is working, the cooling component cools down the shell, thereby reducing the risk of overheating inside the flame detector, which in turn causes the circuit board or flame sensor inside the flame detector to accelerate aging and thermal failure, thereby reducing its performance or even completely failing, affecting the normal operation of the flame detector.

[0010] Optionally, the cooling component includes an air guide and a sensor, the air guide is electrically connected to the sensor, the sensor is used to monitor the shell temperature, and the air guide allows external air to continuously flow through the cooling chamber.

[0011] By adopting the above technical solution, when the temperature inside the shell reaches a certain predetermined value, the induction component controls the air guide component to start, so that the external air continuously flows through the cooling chamber, thereby cooling the inside of the shell.

[0012] Optionally, the sensing element includes a bellows expansion tube located in the cooling chamber, one end of the bellows expansion tube is connected to the inner wall of the shell, the other end of the bellows expansion tube is provided with a sensing switch connected to the inner wall of the shell, the sensing switch is electrically connected to the air guide member, there is a gap between the bellows expansion tube and the sensing switch, and a phase change material is provided in the bellows expansion tube.

[0013] By adopting the above technical solution, when the temperature inside the shell increases, the phase change material in the bellows expands, and the gap between the bellows and the inductive switch gradually decreases until the bellows contacts the inductive switch, and the inductive switch then controls the air guide to start, thereby cooling the inside of the shell.

[0014] Optionally, the outer wall of the shell is provided with an air inlet and an air outlet connected to the cooling chamber, and the air guide member includes an air guide fan, which is located at the air inlet and is used to transport the gas outside the shell into the cooling chamber, and the air guide fan is electrically connected to the induction member and the power supply assembly.

[0015] By adopting the above technical solution, after the air guide is started, the air guide fan transports external gas to the cooling chamber through the air inlet. After the gas passes through the cooling chamber, it leaves the cooling chamber through the air outlet, thereby allowing the external gas to continuously flow through the cooling chamber to cool the inside of the shell.

[0016] Optionally, an air guide duct is provided in the cooling chamber, and the air guide duct is spirally coiled around the outer circumference of the inner shell, one end of the air guide duct is connected to the air inlet and the other end of the air guide duct is connected to the air outlet.

[0017] By adopting the above technical solution, the design of the spiral air inlet duct increases the air flow path in the duct, making the contact between the air and the inner wall of the shell more complete, improving the heat exchange efficiency, and thus improving the cooling efficiency to a certain extent.

[0018] Optionally, a quartz lens is further provided in the housing, and the quartz lens is located on a side of the flame sensor away from the photovoltaic panel, and the side of the quartz lens away from the flame sensor protrudes toward a side away from the flame sensor.

[0019] By adopting the above technical solution, when the flame detector is working, since one side of the quartz lens is convex, the quartz lens can focus the light emitted by the flame onto the sensor, thereby enhancing the intensity and clarity of the flame signal. Through the focusing effect of the quartz lens, the flame sensor can more effectively capture the light signal of the flame, thereby improving the sensitivity and response speed of the flame detector; at the same time, the quartz lens can also focus visible light onto the surface of the photovoltaic panel, thereby increasing the incident intensity and coverage area of ​​the light, and improving the photoelectric conversion efficiency of the photovoltaic panel through the optical focusing effect of the quartz lens.

[0020] Optionally, a quartz glass cover is provided on a side of the housing close to the quartz lens.

[0021] By adopting the above technical solution, quartz glass has high high temperature resistance and can withstand flames and thermal radiation in high temperature environments, so that the quartz glass cover can better protect the flame sensor; at the same time, quartz glass has excellent light transmittance, so that the flame sensor can still effectively capture flame signals under the coverage of the quartz glass cover, thereby reducing the risk of reduced detection performance of the flame sensor.

[0022] Optionally, the phase change material is a hydrate.

[0023] By adopting the above technical solution, hydrates generally have higher chemical stability than some other phase change materials, can maintain structural stability during the phase change process, and are not easy to decompose or fail, thereby ensuring their long-term stability and reliability.

[0024] Optionally, the power supply assembly further includes a backup battery, the backup battery is electrically connected to the photovoltaic panel, and the circuit board and the flame sensor are both electrically connected to the backup battery.

[0025] By adopting the above technical solution, after the photovoltaic panels are irradiated by the visible light in the boiler, the light energy is converted into electrical energy. Secondly, the photovoltaic panels transmit the electricity to the backup battery, and the backup battery provides a stable output current to the circuit board and the flame sensor, thereby reducing the risk of voltage and current fluctuations caused by unstable visible light intensity in the boiler when the external power supply fails, and further improving the reliability of the detector.

[0026] In summary, the present application includes at least one of the following beneficial technical effects: 1. When the flame detector is working, the flame detector is connected to the boiler through the shell, so that the flame sensor faces the inside of the boiler to monitor the flame combustion state in the boiler. When the flame intensity changes, the flame sensor transmits the signal to the circuit board. After receiving the signal from the flame sensor, the circuit board processes and analyzes the signal. During the flame combustion process in the boiler, visible light enters the shell through the light inlet hole and is absorbed by the photovoltaic panel and converted into electrical energy. When the external power supply fails, the photovoltaic panel supplies power to the flame sensor and the circuit board, so that the detector can still work normally when the external power supply fails, thereby improving the reliability of the detector; 2. When the flame detector is working, since one side of the quartz lens is convex, the quartz lens can focus the light emitted by the flame onto the sensor, enhancing the intensity and clarity of the flame signal. Through the focusing effect of the quartz lens, the flame sensor can more effectively capture the light signal of the flame, improving the sensitivity and response speed of the flame detector; at the same time, the quartz lens can also focus visible light onto the surface of the photovoltaic panel, increasing the incident intensity and coverage area of ​​the light, and improving the photoelectric conversion efficiency of the photovoltaic panel through the optical focusing effect of the quartz lens; 3. When the flame detector is working, the cooling component cools down the shell, thereby reducing the risk of overheating inside the flame detector, which in turn causes the circuit board or flame sensor inside the flame detector to accelerate aging and thermal failure, causing its performance to degrade or even fail completely, affecting the normal operation of the flame detector. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of an embodiment of the present application; Figure 2is a top view of an embodiment of the present application; Figure 3 yes Figure 2 Schematic diagram of the cross-sectional structure at AA in the middle; Figure 4 yes Figure 3 A partial enlarged schematic diagram of part B; In the figure: 1. shell; 11. light inlet; 12. inner shell; 13. outer shell; 131. air inlet; 132. air outlet; 14. cooling chamber; 2. flame sensor; 3. circuit board; 4. power supply assembly; 41. photovoltaic panel; 42. backup battery; 5. quartz lens; 6. quartz glass cover; 7. cooling assembly; 71. air guide; 711. air guide fan; 712. air guide duct; 72. induction member; 721. corrugated expansion tube; 722. induction switch. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-4 This application is described in further detail.

[0029] The present application embodiment discloses a flame detector. Figure 1 and Figure 2 , a flame detector comprises a housing 1 for connecting with a boiler.

[0030] Reference Figure 3 and Figure 4 A flame sensor 2 is provided in the shell 1. The flame sensor 2 is used to generate an electrical signal according to the flame condition in the boiler. A light inlet 11 connected to the interior of the shell 1 is opened on the outer wall of the shell 1. A quartz glass cover 6 is provided at the light inlet 11. When the flame detector is connected to the boiler, the light generated in the boiler passes through the quartz glass cover 6 and is received by the flame sensor 2; a circuit board 3 is also provided in the shell 1. The circuit board 3 is installed at one end of the shell 1 away from the quartz glass cover 6, and the circuit board 3 is electrically connected to the flame sensor 2; a power supply component 4 is also provided at one end of the shell 1 away from the quartz glass cover 6, and the power supply component 4 includes a photovoltaic panel 41. The circuit board and the flame sensor 2 are both electrically connected to the photovoltaic panel 41; a cooling component 7 is connected to the shell 1, and the cooling component 7 is used to cool the inside of the shell 1 when the temperature inside the shell 1 reaches a predetermined value.

[0031] When the flame detector is working, the flame detector is connected to the boiler through the shell 1, so that the flame sensor 2 faces the inside of the boiler, and the light inside the boiler passes through the quartz glass cover 6 and is received by the flame sensor 2. Since quartz glass has excellent light transmittance, the flame sensor 2 can still effectively capture the flame signal under the cover of the quartz glass cover 6, thereby reducing the risk of reduced detection performance of the flame sensor 2; at the same time, quartz glass has high high temperature resistance and can withstand flames and thermal radiation in a high temperature environment, so that the quartz glass cover 6 can better protect the flame sensor 2 and reduce the risk of failure of the flame sensor 2.

[0032] During the process of the flame sensor 2 monitoring the flame combustion state in the boiler, when the flame intensity changes, the flame sensor 2 transmits a signal to the circuit board 3. After receiving the signal from the flame sensor 2, the circuit board 3 processes and analyzes the signal; during the flame combustion in the boiler, visible light enters the shell 1 through the light inlet and is absorbed by the photovoltaic panel 41 and converted into electrical energy. When the external power outage or the external power supply fails, the electrical energy converted by the photovoltaic panel 41 powers the flame sensor 2 and the circuit board 3, so that the detector can still work normally when the external power supply fails, thereby improving the reliability of the detector.

[0033] Reference Figure 3 and Figure 4 The power supply assembly 4 also includes a backup battery 42, which is electrically connected to the photovoltaic panel 41, and the circuit board 3 and the flame sensor 2 are both electrically connected to the backup battery 42; during the combustion of fuel in the boiler, there is a risk of instability in the visible light in the furnace. When the circuit board 3 and the flame sensor 2 do not need to be powered by the photovoltaic panel 41, the photovoltaic panel 41 is irradiated by the visible light in the boiler and converts the light energy into electrical energy. The photovoltaic panel 41 transmits the electricity to the backup battery 42 for storage. When an external power outage or an external power supply fails, the backup battery 42 preferentially provides a stable output current to the circuit board 3 and the flame sensor 2, thereby reducing the risk of voltage and current fluctuations caused by the unstable visible light intensity in the boiler when the external power supply fails, and further improving the reliability of the detector.

[0034] Reference Figure 3 and Figure 4A quartz lens 5 is also provided in the shell 1. The quartz lens 5 is located on the side of the flame sensor 2 away from the photovoltaic panel 41, and the side of the quartz lens 5 away from the flame sensor 2 is convex toward the side away from the flame sensor 2; when the flame detector is working, since one side of the quartz lens 5 is convex, the quartz lens 5 can focus the light emitted by the flame onto the sensor, thereby enhancing the intensity and clarity of the flame signal. Through the focusing effect of the quartz lens 5, the flame sensor 2 can more effectively capture the light signal of the flame, thereby improving the sensitivity and response speed of the flame detector; at the same time, the quartz lens 5 can also focus visible light onto the surface of the photovoltaic panel 41, thereby increasing the incident intensity and coverage area of ​​the light, and through the optical focusing effect of the quartz lens 5, the photoelectric conversion efficiency of the photovoltaic panel 41 is improved.

[0035] Reference Figure 3 and Figure 4 The housing 1 includes an inner housing 12, the circuit board 3 and the photovoltaic cell panel 41 are all located in the inner housing 12, the outer housing 13 is provided with an outer housing 13 outside the inner housing 12, a cooling chamber 14 is formed between the inner housing 12 and the outer housing 13, and the cooling component 7 is located in the cooling chamber 14; the cooling component 7 includes an air guide 71 and a sensing component 72, an outer wall of the outer housing 13 is provided with an air inlet 131 and an air outlet 132 connected to the cooling chamber 14, the air guide 71 includes an air guide fan 711, the air guide fan 711 is located at the air inlet 131 and the air guide fan 711 is used to cool the outer wall of the housing 1 The gas from the outside is transported to the cooling chamber 14, the air guide fan 711 is electrically connected to the sensing element 72 and the power supply assembly 4, and the sensing element 72 is used to monitor the temperature of the shell 1; when the internal temperature of the shell 1 reaches a predetermined value, the sensing element 72 controls the air guide element 71 to start, so that the external gas continuously flows through the cooling chamber 14 to cool the inside of the shell 1, thereby reducing the risk of overheating inside the flame detector, which in turn causes the circuit board 3 or the flame sensor 2 inside the flame detector to accelerate aging and thermal failure, thereby reducing its performance and affecting the normal operation of the flame detector.

[0036] Reference Figure 3 and Figure 4 An air guide duct 712 is also provided in the cooling chamber 14. The air guide duct 712 is spirally coiled around the outer periphery of the inner shell 12. One end of the air guide duct 712 is connected to the air inlet 131 and the other end of the air guide duct is connected to the air outlet 132. The design of the spiral air inlet duct increases the air flow path in the duct, making the contact between the air and the inner wall of the shell 1 more complete, improving the heat exchange efficiency, and thus improving the cooling efficiency to a certain extent. In addition, compared with the traditional straight pipe, the spiral air inlet duct can reduce the noise generated during air flow, help reduce turbulent noise and vibration during air flow, thereby reducing the overall noise level.

[0037] Reference Figure 3 and Figure 4The sensing element 72 includes a bellows expansion tube 721 located in the cooling chamber 14, one end of the bellows expansion tube 721 is connected to the inner wall of the shell 1, and the other end of the bellows expansion tube 721 is provided with a sensing switch 722 connected to the inner wall of the shell 1. The sensing switch 722 in the embodiment of the present application is a microcontroller (not shown in the figure) and a pressure sensor. The pressure sensor and the air guide fan 711 are both electrically connected to the microcontroller. There is a gap between the bellows expansion tube 721 and the pressure sensor. A phase change material is provided in the bellows expansion tube 721. The phase change material in the embodiment of the present application is a hydrate.

[0038] Compared with some other phase change materials, hydrates generally have higher chemical stability, can maintain structural stability during the phase change process, and are not easy to decompose or fail, thereby ensuring their long-term stability and reliability; when the temperature inside the shell 1 rises, the hydrate undergoes phase change due to heat, and this process is accompanied by heat absorption and expansion. During the heat absorption process of the hydrate, the temperature inside the shell 1 is reduced, thereby reducing the risk of excessive temperature inside the shell 1 to a certain extent; at the same time, during the gradual extension of the bellows 721, the gap between the bellows 721 and the inductive switch 722 gradually becomes smaller until the bellows 721 contacts the pressure sensor, and the pressure sensor transmits a signal to the microcontroller, and then the microcontroller controls the air guide fan 711 to start, thereby cooling the inside of the shell 1; when the temperature drops, the hydrate in the bellows 721 shrinks in volume, and the bellows 721 gradually shortens. After the bellows 721 is separated from the inductive switch 722, the pressure sensor transmits a signal to the microcontroller, and then the microcontroller controls the air guide member 71 to stop running.

[0039] The implementation principle of a flame detector in an embodiment of the present application is as follows: when the flame detector is working, the flame sensor 2 faces the inside of the boiler to monitor the flame combustion state in the boiler. When the flame intensity changes, the flame sensor 2 transmits the signal to the circuit board 3. After receiving the signal from the flame sensor 2, the circuit board 3 processes and analyzes the signal. During the flame combustion process in the boiler, visible light enters the shell 1 through the light inlet and is absorbed by the photovoltaic panel 41 and converted into electrical energy. When the external power supply fails, the photovoltaic panel 41 supplies power to the flame sensor 2 and the circuit board 3, so that the detector can still work normally when the external power supply fails, thereby improving the reliability of the detector.

[0040] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A flame detector, characterized in that: include: A shell (1), wherein the shell (1) is used to be connected to a boiler; A flame sensor (2), the flame sensor (2) being located inside the housing (1), and the flame sensor (2) being used to generate an electrical signal according to a flame condition in the boiler; A circuit board (3), the circuit board (3) being mounted inside the housing (1) at one end facing away from the flame sensor (2), the circuit board (3) being electrically connected to the flame sensor (2); A power supply assembly (4), the power supply assembly (4) comprising a photovoltaic cell panel (41), the photovoltaic cell panel (41) being located between a circuit board (3) and a flame sensor (2), the circuit board (3) and the flame sensor (2) being electrically connected to the photovoltaic cell panel (41), and a light inlet (11) being provided on a side of the housing (1) close to the flame sensor (2).

2. A flame detector according to claim 1, characterized in that: The housing (1) comprises an inner housing (12), the circuit board (3) and the photovoltaic cell panel (41) are both located inside the inner housing (12), an outer housing (13) is disposed outside the inner housing (12), a cooling chamber (14) is formed between the inner housing (12) and the outer housing (13), and a cooling component (7) for cooling the interior of the housing (1) is disposed inside the cooling chamber (14).

3. A flame detector according to claim 2, characterized in that: The cooling component (7) comprises an air guide (71) and a sensing component (72), wherein the air guide (71) and the sensing component (72) are electrically connected, the sensing component (72) is used to monitor the temperature of the housing (1), and the air guide (71) is used to allow external air to continuously flow through the cooling chamber (14).

4. A flame detector according to claim 3, characterized in that: The sensing component (72) comprises a bellows expansion tube (721) located in the cooling chamber (14); one end of the bellows expansion tube (721) is connected to the inner wall of the shell (1); the other end of the bellows expansion tube (721) is provided with a sensing switch (722) connected to the inner wall of the shell (1); the sensing switch (722) is electrically connected to the air guide component (71); a gap is provided between the bellows expansion tube (721) and the sensing switch (722); and a phase change material is provided in the bellows expansion tube (721).

5. A flame detector according to claim 3, characterized in that: An air inlet (131) and an air outlet (132) connected to the cooling chamber (14) are formed on the outer wall of the outer shell (13); the air guide member (71) comprises an air guide fan (711); the air guide fan (711) is located at the air inlet (131) and is used to transport gas outside the shell (1) into the cooling chamber (14); the air guide fan (711) is electrically connected to the induction member (72) and the power supply assembly (4).

6. A flame detector according to claim 5, characterized in that: An air guide duct (712) is provided in the cooling chamber (14), the air guide duct (712) being spirally wound around the outer circumference of the inner shell (12), one end of the air guide duct (712) being connected to the air inlet (131) and the other end of the air guide duct being connected to the air outlet (132).

7. A flame detector according to claim 1, characterized in that: A quartz lens (5) is also provided in the housing (1); the quartz lens (5) is located on a side of the flame sensor (2) facing away from the photovoltaic cell panel (41); and the side of the quartz lens (5) facing away from the flame sensor (2) protrudes toward a side away from the flame sensor (2).

8. A flame detector according to claim 7, characterized in that: A quartz glass cover (6) is provided on one side of the housing (1) close to the quartz lens (5).

9. A flame detector according to claim 4, characterized in that: The phase change material is a hydrate.

10. A flame detector according to claim 1, characterized in that: The power supply assembly (4) further comprises a backup battery (42), wherein the backup battery (42) is electrically connected to the photovoltaic panel (41), and the circuit board (3) and the flame sensor (2) are both electrically connected to the backup battery (42).

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