Red and ultraviolet composite flame detector

Abstract

The utility model relates to the technical field of fire detection, in particular to a red and ultraviolet composite flame detector, which comprises a power supply module, a high-voltage generation circuit, an ultraviolet detection circuit, an infrared detection circuit, a main control unit and an alarm output module, the power supply module is respectively connected with the high-voltage generation circuit, the ultraviolet detection circuit, the infrared detection circuit, the main control unit and the alarm output module; the main control unit is respectively connected with the infrared detection circuit and the alarm output module; the high-voltage generation circuit is connected with the ultraviolet detection circuit; the main control unit is connected with the ultraviolet detection circuit, the ultraviolet detection circuit transmits a high-voltage pulse signal to the main control unit, and the main control unit sends an instruction according to the received high-voltage pulse signal to control high-voltage pressure relief of the ultraviolet detection circuit. According to the utility model, the technical problem that the ultraviolet sensor generates continuous discharge after ultraviolet triggers a gas multiplication effect in a high-voltage environment is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fire detection, in particular to an infrared and ultraviolet composite flame detector. Background Art

[0002] The infrared-ultraviolet (IR-UV) composite flame detector is an advanced flame detection device. Its dual detection mechanism, combining ultraviolet and infrared technologies, significantly improves flame detection sensitivity and accuracy. With the continuous advancement of technology, the IR-UV composite flame detector utilizes more advanced sensors and algorithms, significantly reducing false alarm rates and further optimizing detection performance, making it an indispensable core component in modern industrial safety systems. This detector plays a vital role in preventing fire risks and ensuring production process safety. It is widely used in a variety of industries, including the chemical industry, power generation, printing, and aerospace, providing reliable safety protection for flammable and explosive environments.

[0003] The Chinese invention patent, entitled "A High-Speed, High-Precision Flame Detection Device and Method," with publication number CN117636559B, has been published. The patent includes a photoelectric detection assembly, an infrared detection assembly, an ultraviolet detection assembly, a central processing unit, and an alarm output unit. The data signals collected by the photoelectric, infrared, and ultraviolet detection assemblies are transmitted to the central processing unit, which processes the received signals and sends a signal to the alarm output unit based on the processing results. In this patent, the various detection assemblies work together to achieve fast response speeds and low false alarm rates. However, in the ultraviolet detection assembly of this patent, when ultraviolet light is incident on the ultraviolet sensor in a high-voltage environment, photoelectrons are generated and trigger a gas multiplication effect. Once this effect is activated, even after the ultraviolet light weakens or disappears, the electrons and ions already filled in the sensor may remain in a discharge state, generating a continuous current. This not only damages the sensor but also interferes with normal ultraviolet signal detection. Furthermore, the continuous discharge can cause safety hazards such as electric sparks or high temperatures, increasing the risk of fire. Therefore, it is extremely important to solve the problem of UV sensors in high-pressure environments causing continuous discharge due to the gas multiplication effect triggered by ultraviolet rays, which leads to sensor damage, signal interference and potential safety hazards. Utility Model Content

[0004] The purpose of this application is to provide a red-ultraviolet composite flame detector, which solves the technical problem that in a high-voltage environment, the ultraviolet sensor generates continuous discharge after the ultraviolet light triggers the gas multiplication effect.

[0005] In order to solve the above technical problems, the solution adopted by this application is as follows:

[0006] The utility model provides a red-ultraviolet composite flame detector, comprising a power supply module, a high-voltage generating circuit, an ultraviolet detection circuit, an infrared detection circuit, a main control unit, and an alarm output module, wherein the power supply module is respectively connected to the high-voltage generating circuit, the ultraviolet detection circuit, the infrared detection circuit, the main control unit, and the alarm output module; the main control unit is respectively connected to the infrared detection circuit and the alarm output module; the high-voltage generating circuit is connected to the ultraviolet detection circuit; the input end of the main control unit is connected to the output end of the ultraviolet detection circuit, and the ultraviolet detection circuit transmits a high-voltage pulse signal to the main control unit; and the utility model is characterized in that the output end of the main control unit is connected to the input end of the ultraviolet detection circuit, and the main control unit sends an instruction to control the high-voltage pressure relief of the ultraviolet detection circuit according to the received high-voltage pulse signal.

[0007] In some embodiments, the power supply module includes a protection circuit and a conversion circuit. The protection circuit and the input end of the conversion circuit are connected, and the output end of the conversion circuit is respectively connected to the high-voltage generating circuit, ultraviolet detection circuit, infrared detection circuit, main control unit, and alarm output module.

[0008] In some embodiments, the protection circuit includes an input surge protection circuit, a reverse connection protection circuit, and an EMI filter circuit, and the input surge protection circuit, the reverse connection protection circuit, and the EMI filter circuit are connected in sequence; the conversion circuit includes a primary conversion circuit, a secondary conversion circuit, and a tertiary conversion circuit, and the voltage signal output by the EMI filter circuit is converted in voltage through the primary conversion circuit, the secondary conversion circuit, and the tertiary conversion circuit in sequence.

[0009] In some embodiments, an onboard temperature detection circuit is further included, and the onboard temperature detection circuit is connected to the main control unit and the power module respectively.

[0010] In some embodiments, the alarm output module includes a fault indication output circuit and a flame signal output circuit, and the fault indication output circuit and the flame signal output circuit both include a relay, a transistor, and an interface terminal. The main control unit drives the relay through the transistor, and the output end of the relay outputs a signal through the interface terminal.

[0011] In some embodiments, an RTC module is further included, and the RTC module is connected to the main control unit and the power supply module respectively.

[0012] In some embodiments, an RS485 communication circuit is further included, and the RS485 communication circuit is connected to the main control unit and the power module respectively.

[0013] In some embodiments, an alarm indicator light is further included, and the alarm indicator light is connected to the main control unit and the power module respectively.

[0014] In some embodiments, a parameter storage module is further included, and the parameter storage module is connected to the main control unit and the power supply module respectively.

[0015] The technical solution of this application has at least the following advantages and beneficial effects:

[0016] Compared with the traditional high-pressure pressure relief scheme, that is, a quenching circuit constructed based on resistors and capacitors is set in the ultraviolet detection circuit for high-pressure pressure relief, in the utility model, the main control unit sends instructions according to the high-voltage pulse signal transmitted by the ultraviolet detection circuit to control the ultraviolet detection circuit to perform high-pressure pressure relief operation, avoiding the deviation that may occur in the traditional method, and the main control unit directly and accurately controls the quenching time to ensure the accuracy and stability of the operation; in addition, this control method also significantly improves the overall stability of the system, and effectively solves the problem of continuous discharge of the ultraviolet sensor caused by the gas multiplication effect triggered by ultraviolet rays under high-pressure environment, thereby avoiding sensor damage, signal interference and potential safety risks, and providing a guarantee for the long-term stable operation of the ultraviolet detection circuit and even the entire system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic diagram of the overall structure of the utility model. DETAILED DESCRIPTION

[0018] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] It should be noted that similar reference numerals and letters denote similar items in the following figures. Therefore, once an item is defined in one figure, it does not require further definition or explanation in subsequent figures. Terms such as "center," "upper," "lower," "inner," and "outer" indicate positions or locations based on the positions or locations shown in the figures, or the positions or locations in which the product is typically placed when in use. These terms are used solely for ease of description and simplification of the present application. They do not indicate or imply that the device or component referred to must have a specific position, be constructed, or operate in a specific orientation, and are not to be construed as limiting the present application. It should also be noted that, unless otherwise expressly specified or limited, the terms "disposed," "mounted," and "connected" should be interpreted broadly. For example, they can refer to fixed, removable, or integral connections; mechanical or electrical connections; direct connections or indirect connections through an intermediary; or internal connections between two components. Those skilled in the art will understand the specific meanings of these terms in this application in specific contexts.

[0020] Example 1

[0021] Please refer to Figure 1 The utility model provides a red-ultraviolet composite flame detector, which is the same as the existing technology and includes a power supply module, a high-voltage generating circuit, an ultraviolet detection circuit, an infrared detection circuit, a main control unit, and an alarm output module. The power supply module is respectively connected to the high-voltage generating circuit, the ultraviolet detection circuit, the infrared detection circuit, the main control unit, and the alarm output module; the main control unit is respectively connected to the infrared detection circuit and the alarm output module; the high-voltage generating circuit is connected to the ultraviolet detection circuit; the input end of the main control unit is connected to the output end of the ultraviolet detection circuit, and the ultraviolet detection circuit transmits a high-voltage pulse signal to the main control unit.

[0022] The high-voltage generating circuit is used to convert the low-voltage direct current into a constant high-voltage direct current, and transmit the high-voltage direct current to the ultraviolet detection circuit to provide a stable operating voltage for the ultraviolet detection circuit;

[0023] The ultraviolet detection circuit is used to monitor the ultraviolet rays in the flame and output a high-voltage pulse signal to the main control unit based on the monitoring results;

[0024] The infrared detection circuit is used to monitor the infrared rays in the flame, amplify the collected infrared data, and transmit it to the main control unit;

[0025] Alarm output module, used to output alarm signals, the main control unit sends control instructions to external devices through the alarm output module;

[0026] The power module is used to provide power to the high voltage generating circuit, ultraviolet detection circuit, infrared detection circuit, main control unit, and alarm output module;

[0027] The main control unit, the main control circuit is used to process and analyze the received high-voltage pulse signal and infrared data, and output control instructions to the alarm output module according to the analysis results; the main control unit includes a single-chip microcomputer and peripheral circuits, and the single-chip microcomputer and peripheral circuits are connected;

[0028] It should be noted that the peripheral circuit includes a single-chip minimum system and a component module. The single-chip minimum system includes but is not limited to a reset circuit and a clock circuit; the component module includes but is not limited to a firmware debugging interface, a serial port debugging interface, and an external reference voltage source;

[0029] It should be explained that the external reference voltage source provides a reference voltage for the ADC inside the microcontroller, which can achieve high-precision acquisition of infrared data; in the present utility model, the external reference voltage source includes an IC chip, whose model is ADR5043ARTZ;

[0030] It should be noted that the microcontroller uses ST's M4 core L4 series main controller, and its model is STM32L431CCT6.

[0031] Different from the prior art, the output end of the main control unit is connected to the input end of the ultraviolet detection circuit, and the main control unit sends instructions to control the high-voltage pressure relief of the ultraviolet detection circuit according to the received high-voltage pulse signal;

[0032] For ease of understanding, the high-pressure relief process is now explained:

[0033] The high-voltage generating circuit transmits high-voltage direct current to the ultraviolet detection circuit. The ultraviolet sensor in the ultraviolet detection circuit detects whether there is specific ultraviolet light in the environment, thereby determining whether there is a flame in the environment;

[0034] When the UV sensor detects the presence of specific UV light in the environment, photoelectrons are generated inside the UV sensor and trigger the gas multiplication effect. The UV sensor begins to discharge, and the UV detection circuit outputs a high-voltage pulse signal to the main control unit.

[0035] The main control unit processes the high-voltage pulse signal received and outputs instructions to the ultraviolet detection circuit. After receiving the signal, the ultraviolet detection circuit performs a high-voltage pressure relief operation, so that the ultraviolet sensor returns to its initial state.

[0036] It is worth noting that each time after receiving a high-voltage pulse signal, the main control unit will output a control instruction to the ultraviolet detection circuit to control the ultraviolet sensor to perform a high-voltage pressure relief operation.

[0037] The utility model is also provided with an onboard temperature detection circuit, which is connected to the main control unit and the power module respectively. The onboard temperature detection circuit is used not only to monitor the internal temperature of the detector in real time, but also to monitor whether there is frost or condensation on the optical window of the detector, so as to determine whether the window heating needs to be turned on.

[0038] It should be noted that the onboard temperature detection circuit in this embodiment uses an NTC circuit to collect the ambient temperature;

[0039] It needs to be explained that the optical window is the channel for external light to enter the flame detector. It allows specific wavelengths of light generated by the flame (such as ultraviolet light or infrared light) to penetrate and illuminate the detection circuit inside the detector. At the same time, the optical window can also protect the internal circuit and prevent dust, water vapor, etc. in the external environment from damaging the internal circuit.

[0040] The present invention also has an RTC module, which is connected to the main control unit and the power module respectively, and is used to provide the detector with a time information function so as to facilitate log information recording and communication for other modules; the RTC module includes but is not limited to a clock chip, a quartz crystal oscillator, and an RTC battery;

[0041] It should be explained that the RTC module circuit uses the I2C interface to connect to the main controller.

[0042] The utility model also includes an RS485 communication circuit, which is connected to the main control unit and power module respectively. This circuit is used to connect and communicate with an external PC or other control terminal to enable internal detector data export, firmware upgrades, parameter configuration, etc. The RS485 communication circuit includes an RS485 level conversion chip and an interface protection circuit, and the RS485 level conversion chip and the interface protection circuit are connected.

[0043] The utility model also has an alarm indicator light, which is connected to the main control unit and the power module respectively, and is used to indicate the status of the detector. When the detector monitors and identifies a flame signal or detects a detector failure, the alarm indicator light is in the on state after receiving the signal from the single-chip microcomputer.

[0044] The utility model also has a parameter storage module, which is connected to the main control unit and the power module respectively, and is used to store red and ultraviolet trigger signals, event log data, etc.; the parameter storage module includes a ferroelectric memory, whose model is MB85RS256BPNF-G-JNERE1; the single-chip microcomputer is connected to the ferroelectric memory through the SPI interface.

[0045] In the utility model, the alarm output module includes a fault indication output circuit and a flame signal output circuit. The fault indication output circuit and the flame signal output circuit both include relays, transistors, and interface terminals. The main control unit drives the relay through the transistor, and the output end of the relay outputs a signal through the interface terminal.

[0046] It should be explained that the fault indication output circuit is used to detect the detector fault signal output; the flame signal output circuit is used to output the flame detection alarm signal.

[0047] The power supply module includes a protection circuit and a conversion circuit. The protection circuit is connected to the input end of the conversion circuit, and the output end of the conversion circuit is respectively connected to the high-voltage generating circuit, the ultraviolet detection circuit, the infrared detection circuit, the main control unit, and the alarm output module.

[0048] It should be noted that the protection circuit includes an input surge protection circuit, a reverse polarity protection circuit, and an EMI filter circuit, which are connected in sequence; the external voltage is transmitted to the conversion circuit through the input surge protection circuit, the reverse polarity protection circuit, and the EMI filter circuit in sequence;

[0049] Input surge protection circuit, used to protect subsequent circuits from external voltage shocks;

[0050] Reverse connection protection circuit, used to prevent damage to subsequent circuits when the power or ground wires are connected in reverse;

[0051] EMI filter circuit is used to filter out the interference of high-frequency pulses of external voltage on subsequent circuits.

[0052] It should be noted that the conversion circuit steps down the received voltage and transmits the stepped-down voltage to the remaining modules or circuits. The conversion circuit includes a primary conversion circuit, a secondary conversion circuit, and a tertiary conversion circuit. The voltage signal output by the EMI filter circuit is converted in voltage by the primary conversion circuit, the secondary conversion circuit, and the tertiary conversion circuit in sequence.

[0053] It should be explained that in this embodiment, the voltage converted by the first-level conversion circuit is transmitted to the ultraviolet detection circuit and the high-voltage generating circuit; the voltage converted by the second-level conversion circuit is transmitted to the infrared detection circuit; the voltage converted by the third-level conversion circuit is transmitted to the main control unit, the ultraviolet detection circuit, the on-board temperature module, the alarm output module, the RTC module, the RS485 module, the alarm indicator light, and the parameter storage module.

[0054] It should be noted that each module in the present invention can be purchased in domestic and foreign markets.

[0055] Thus far, various embodiments of the present invention have been described in detail. To avoid obscuring the concept of the present invention, some details known in the art have been omitted. Based on the above description, those skilled in the art will fully understand how to implement the technical solutions of the present invention. The scope of the present invention is defined by the appended claims.

Claims

1. A red and ultraviolet composite flame detector, characterized in that: It includes a power supply module, a high-voltage generating circuit, an ultraviolet detection circuit, an infrared detection circuit, a main control unit, and an alarm output module. The power supply module is respectively connected to the high-voltage generating circuit, the ultraviolet detection circuit, the infrared detection circuit, the main control unit, and the alarm output module; the main control unit is respectively connected to the infrared detection circuit and the alarm output module; the high-voltage generating circuit is connected to the ultraviolet detection circuit; the input end of the main control unit is connected to the output end of the ultraviolet detection circuit, and the ultraviolet detection circuit transmits a high-voltage pulse signal to the main control unit; the output end of the main control unit is connected to the input end of the ultraviolet detection circuit, and the main control unit sends instructions to control the high-voltage pressure relief of the ultraviolet detection circuit according to the received high-voltage pulse signal.

2. The red-ultraviolet composite flame detector according to claim 1, characterized in that: The power supply module includes a protection circuit and a conversion circuit. The protection circuit is connected to the input end of the conversion circuit, and the output end of the conversion circuit is respectively connected to the high-voltage generating circuit, ultraviolet detection circuit, infrared detection circuit, main control unit, and alarm output module.

3. The red-ultraviolet composite flame detector according to claim 2, characterized in that: The protection circuit includes an input surge protection circuit, a reverse connection protection circuit, and an EMI filter circuit, which are connected in sequence; the conversion circuit includes a primary conversion circuit, a secondary conversion circuit, and a tertiary conversion circuit, and the voltage signal output by the EMI filter circuit is converted in voltage through the primary conversion circuit, the secondary conversion circuit, and the tertiary conversion circuit in sequence.

4. The red-ultraviolet composite flame detector according to claim 1, characterized in that: It also includes an onboard temperature detection circuit, which is connected to the main control unit and the power module respectively.

5. The red-ultraviolet composite flame detector according to claim 1, characterized in that: The alarm output module includes a fault indication output circuit and a flame signal output circuit. Both the fault indication output circuit and the flame signal output circuit include a relay, a transistor, and an interface terminal. The main control unit drives the relay through the transistor, and the output end of the relay outputs a signal through the interface terminal.

6. The red-ultraviolet composite flame detector according to claim 1, characterized in that: It also includes an RTC module, which is connected to the main control unit and the power supply module respectively.

7. The red-ultraviolet composite flame detector according to claim 1, characterized in that: It also includes an RS485 communication circuit, which is connected to the main control unit and the power supply module respectively.

8. The red-ultraviolet composite flame detector according to claim 1, characterized in that: It also includes an alarm indicator light, which is connected to the main control unit and the power module respectively.

9. The red-ultraviolet composite flame detector according to claim 1, characterized in that: It also includes a parameter storage module, which is connected to the main control unit and the power supply module respectively.

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