A stand-alone photoelectric smoke detector and alarm

Abstract

This utility model discloses an independent photoelectric smoke detector and alarm, comprising: a front shell, a bottom shell adapted to the front shell, a Fresnel lens disposed on the front shell, a PCB board with a maze disposed between the front shell and the bottom shell, a buzzer module, an EVE ring disposed on the maze, a mounting plate connected to the bottom shell by a snap-fit ​​mechanism, a positive electrode and a negative electrode disposed in the battery compartment at the bottom of the bottom shell, a leak-proof cartridge pin and a leak-proof switch, and a battery disposed on the positive electrode and the negative electrode; the PCB board is provided with a main control module, a smoke detection module, a human infrared detection module, an infrared signal receiving module, a temperature detection module, an infrared emitting module, a CAT1 communication module, a SIM card module, a CAT1 module boost power supply module, a program programming port module, an AT serial port circuit between the MCU and the CAT1 module, and a module firmware download circuit.

Description

Technical Field

[0001] This utility model relates to the field of alarm technology, and in particular to a stand-alone photoelectric smoke detector alarm. Background Technology

[0002] With rapid urbanization and industrialization, the number of high-rise buildings, commercial complexes, and factories has increased, leading to a rise in fire risks. Once a fire breaks out, it not only threatens people's lives but can also cause enormous property damage and social impact. Therefore, establishing an efficient and reliable fire prevention and alarm system is of paramount importance.

[0003] Traditional fire alarm systems primarily rely on fixed smoke detectors. These systems typically require complex wiring and professional installation and maintenance, and their functionality is relatively limited, mainly confined to on-site alarms. With the development of IoT technology and the popularization of smart homes, the market has placed new demands on fire alarm systems: ease of installation, intelligence, remote monitoring, and multi-mode alarms.

[0004] While existing stand-alone photoelectric smoke detectors meet market demand to some extent, they still have limitations. For example, some detectors lack sufficient smoke detection sensitivity and are easily affected by environmental factors such as dust and steam, leading to false alarms or missed alarms. Furthermore, these detectors often lack intelligent features, such as infrared human detection and temperature monitoring, failing to provide more accurate fire assessment. The lack of remote communication capabilities also limits the practicality and reliability of these detectors. Utility Model Content

[0005] To address the problems existing in the prior art, this utility model provides a stand-alone photoelectric smoke detector and alarm.

[0006] To achieve the above objectives, the technical solution of this utility model is as follows:

[0007] This utility model provides an independent photoelectric smoke detector and alarm, including: a front shell, a bottom shell adapted to the front shell, a Fresnel lens disposed on the front shell, a PCB board with a maze disposed between the front shell and the bottom shell, a buzzer module, an EVE ring disposed on the maze, a mounting plate connected to the bottom shell by a snap-fit ​​method, a positive electrode and a negative electrode disposed in the battery compartment at the bottom of the bottom shell, a leak-proof cartridge pin and a leak-proof switch, and a battery disposed on the positive electrode and the negative electrode.

[0008] The PCB board is equipped with a main control module, a smoke detection module, a human infrared detection module, an infrared signal receiving module, a temperature detection module, an infrared transmitting module, a CAT1 communication module, a SIM card module, a CAT1 module boost power supply module, a program burning port module, an AT serial port circuit for MCU and CAT1 communication module, and a module firmware download circuit.

[0009] The main control module is electrically connected to the smoke detection module, human infrared detection module, infrared signal receiving module, temperature detection module, infrared emitting module, CAT1 communication module, CAT1 module boost power supply module, program burning port module, AT serial port circuit, buzzer module, and battery corresponding terminals, respectively.

[0010] The corresponding terminals of the CAT1 communication module are electrically connected to the corresponding terminals of the SIM card module, the AT serial port circuit, and the module firmware download circuit, respectively.

[0011] Preferably, the faceplate has an opening in the middle, one end of the maze passes through the opening, and the EVE ring is placed at the opening; the bottom of the mounting plate has four buckles, and correspondingly, the faceplate has four slots that are adapted to the four buckles.

[0012] Preferably, the main control module includes an MCU and its peripheral circuits, and an LED alarm indicator that is electrically connected to the corresponding end of the MCU. The model of the MCU is PY32L020F15P.

[0013] Preferably, the smoke detection module includes a smoke detection circuit, which includes a voltage regulator circuit and an operational amplifier circuit electrically connected to the corresponding terminal of the voltage regulator circuit; the corresponding terminals of the voltage regulator circuit and the operational amplifier circuit are both electrically connected to the corresponding terminals of the MCU.

[0014] Preferably, the human infrared detection module includes an infrared receiver PY1, resistors R32 and R40, capacitors C26 and C27, and diode D4; the first pin of the infrared receiver PY1 is electrically connected to the first terminal of capacitor C26, the first terminal of capacitor C27, and the corresponding terminal of the MCU; the second terminals of capacitors C26 and C27 are both grounded; the second pin of the infrared receiver PY1 is electrically connected to the first terminal of resistor R32 and the first terminal of diode D4; and the third pin of the infrared receiver PY1 is electrically connected to the second terminal of resistor R32 and the second terminal of diode D4.

[0015] Preferably, the temperature detection module includes a temperature detection circuit, which includes a resistor R2 and a thermistor; the resistor R2 is electrically connected to the MCU and the first terminal of the thermistor, and the second terminal of the thermistor is grounded.

[0016] Preferably, the CAT1 communication module includes a CAT1 communication circuit, which includes an ML307A chip and its peripheral circuits.

[0017] Preferably, the CAT1 module boost power supply circuit includes a boost chip AH6910 and its peripheral circuits, and the corresponding terminal of the boost chip AH6910 is electrically connected to the corresponding terminal of the MCU.

[0018] Preferably, the AT serial port circuit includes an AT serial port circuit one and an AT serial port circuit two electrically connected to the corresponding terminals of the AT serial port circuit one;

[0019] The first AT serial port circuit includes a transistor Q5, a resistor R21, and a resistor R27. The base of transistor Q5 is electrically connected to the first terminal of resistor R21, the emitter of transistor Q5 is electrically connected to the corresponding terminal of the MCU, and the collector of transistor Q5 is electrically connected to the ML307A chip and the first terminal of resistor R27. The second terminal of resistor R27 is electrically connected to the second terminal of resistor R21 and the corresponding terminal of the second AT serial port circuit.

[0020] The second AT serial port circuit includes a transistor Q6, a resistor R31, and a resistor R35. The base of the transistor Q6 is electrically connected to the second terminal of the resistor R27 via the resistor R31, the emitter is electrically connected to the corresponding terminal of the ML307A chip, and the collector is electrically connected to the corresponding terminal of the MCU and the first terminal of the resistor R35. The second terminal of the resistor R35 is electrically connected to the corresponding terminal of the MCU.

[0021] The technical solution of this utility model has the following beneficial effects:

[0022] This novel fire alarm not only possesses highly sensitive smoke detection capabilities but also integrates multiple functions such as human infrared detection, temperature monitoring, and remote communication, enabling early fire detection, intelligent assessment, and remote alarm activation. The alarm effectively improves the accuracy and response speed of fire alarms, providing users with a safer, more convenient, and intelligent fire prevention solution.

[0023] High-sensitivity smoke detection: This alarm can quickly and accurately detect changes in smoke concentration in the environment, enabling early fire warning.

[0024] Intelligent fire detection: Combining human infrared detection module and temperature detection module, this alarm can intelligently determine whether there are people present and changes in ambient temperature, thereby reducing false alarms and improving alarm accuracy.

[0025] Remote monitoring and alarm: By integrating a CAT1 communication circuit, this alarm can achieve remote communication, sending fire alarm information to the monitoring center or user's mobile phone in real time, enabling remote monitoring and rapid response.

[0026] Easy to install and use: This alarm features a stand-alone design, requiring no complex wiring and is easy to install, making it suitable for various locations such as homes, offices, and shopping malls.

[0027] Enhanced safety: Through timely and accurate fire alarms and remote notifications, this alarm system can effectively improve the efficiency of personnel evacuation and fire fighting, and reduce casualties and property losses caused by fires. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ;

[0029] Figure 2 This is a schematic diagram of the structure of the present utility model. Figure 2 ;

[0030] Figure 3 This is a schematic diagram of the structure of the present utility model. Figure 3 ;

[0031] Figure 4 This is an exploded view of the structure of this utility model;

[0032] Figure 5 This is a schematic diagram of the control module of this utility model;

[0033] Figure 6 This is the circuit schematic diagram of the main control module of this utility model;

[0034] Figure 7 This is the circuit diagram of the smoke detection module of this utility model;

[0035] Figure 8 This is the circuit schematic diagram of the buzzer module of this utility model;

[0036] Figure 9 This is a circuit diagram of the temperature detection module of this utility model;

[0037] Figure 10 This is a circuit diagram of the infrared signal receiving module of this utility model;

[0038] Figure 11 This is a circuit diagram of the infrared emitting module of this utility model;

[0039] Figure 12 This is the circuit schematic diagram of the program programming port module of this utility model;

[0040] Figure 13 This is the circuit schematic diagram of the AT serial port circuit of this utility model;

[0041] Figure 14 This is the circuit diagram of the human infrared detection module of this utility model;

[0042] Figure 15 This is the circuit schematic diagram of the CAT1 communication module of this utility model;

[0043] Figure 16 This is the circuit schematic diagram of the CAT1 module boost power supply module of this utility model. Detailed Implementation

[0044] The embodiments of this utility model are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0045] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0046] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying 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 this utility model, "a plurality of" means two or more, unless otherwise explicitly specified.

[0047] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0048] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can include direct contact between the first and second features, or contact between the first and second features through another feature between them. Furthermore, "above," "over," and "on top" of the second feature includes the first feature directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature includes the first feature directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0049] Reference Figures 1 to 16 This utility model provides an independent photoelectric smoke detector and alarm, comprising: a front shell 1, a bottom shell 6 adapted to the front shell 1, a Fresnel lens 2 disposed on the front shell 1, a PCB board 5 with a maze disposed between the front shell 1 and the bottom shell 6, a buzzer module 3, an EVE ring 4 disposed on the maze, a mounting plate 16 connected to the bottom shell 6 by a snap-fit, positive electrode plates (8, 11) and negative electrode plates (9, 10) disposed in the battery compartment at the bottom of the bottom shell 6, a leak-proof cartridge pin 12 and a leak-proof switch 13, and a battery 15 disposed on the positive electrode plates (8, 11) and the negative electrode plates (9, 10); the Fresnel lens 2 is used to focus and scatter light, enhance the detection sensitivity of the photoelectric smoke sensor to smoke particles, and improve the accuracy and response speed of smoke detection.

[0050] The PCB board 5 is equipped with a main control module 20, a smoke detection module 21, a human infrared detection module 220, an infrared signal receiving module 22, a temperature detection module 25, an infrared emitting module 23, a CAT1 communication module 26, a SIM card module 29, a CAT1 module boost power supply module 27, a program burning port module 24, an AT serial port circuit for MCU and CAT1 communication module 28, and a module firmware download circuit.

[0051] The main control module 20 is electrically connected to the smoke detection module 21, the human infrared detection module 220, the infrared signal receiving module 22, the temperature detection module 25, the infrared emitting module 23, the CAT1 communication module 26, the CAT1 module boost power supply module 27, the program burning port module 24, the AT serial port circuit 28, the buzzer module 3, and the battery 15 respectively.

[0052] The corresponding terminals of the CAT1 communication module 26 are electrically connected to the corresponding terminals of the SIM card module 29, the AT serial port circuit 28, and the module firmware download circuit, respectively.

[0053] Furthermore, the faceplate 1 has an opening in the middle, one end of the maze passes through the opening, and the EVE ring 4 is placed at the opening; the bottom of the mounting plate 16 is provided with four buckles 160, and correspondingly, the faceplate 1 is provided with four slots that are adapted to the four buckles 160.

[0054] Furthermore, the faceplate 1 has an opening in the middle, one end of the maze passes through the opening, and the EVE ring 4 is placed at the opening; the bottom of the mounting plate 16 has four clips 160, and correspondingly, the faceplate 1 has four slots adapted to the four clips 160. The maze increases the length of the airflow path, allowing the smoke to fully diffuse and mix before reaching the sensor, thus improving the sensitivity of smoke detection. The EVE ring 4 is placed at the opening of the faceplate, serving a sealing function to prevent dust and foreign objects from entering the alarm through the opening.

[0055] Furthermore, the main control module 20 includes an MCU and its peripheral circuits, and an LED alarm indicator that is electrically connected to the corresponding end of the MCU. The model of the MCU is PY32L020F15P.

[0056] Furthermore, the smoke detection module 21 includes a smoke detection circuit, which includes a voltage regulator circuit and an operational amplifier circuit electrically connected to the corresponding terminal of the voltage regulator circuit; the corresponding terminals of the voltage regulator circuit and the operational amplifier circuit are both electrically connected to the corresponding terminals of the MCU.

[0057] The voltage regulator circuit includes a voltage regulator chip SD5121-2.1V-SOT23 and its peripheral circuitry; the corresponding terminals of the voltage regulator chip SD5121-2.1V-SOT23 are electrically connected to the corresponding terminals of the operational amplifier circuit. The operational amplifier circuit includes resistors R12, R13, R14, R20, R15, R16, R17, R18, R19, R22, R25, R29, RT2, amplifiers U1B and U1A, capacitors C4, C2, C5, C6, C7, C8, C9, C15, C33, an LED PD, and an LED D3; pin 2 of the voltage regulator chip SD5121-2.1V-SOT23 is connected via resistor R13. The first terminal of resistor R17 and the first terminal of resistor R20 are electrically connected. The second terminal of resistor R17 is electrically connected to the first terminals of capacitor C33, capacitor C6, LED PD, and the non-inverting input terminal of amplifier U1A. The second terminal of LED PD is electrically connected to the first terminals of capacitor C8, capacitor C6, and resistor R29. The second terminal of resistor R29 is electrically connected to the first terminal of capacitor C9. The second terminals of capacitor C8, capacitor C9, and resistor R20 are all grounded. The second terminal of capacitor C33... The first terminal of resistor R15 is electrically connected to the inverting input terminal of amplifier U1A, the first terminal of resistor R12, the first terminal of resistor R15, the first terminal of resistor R12, the first terminal of resistor R14, and the first terminal of capacitor C2, respectively. The second terminal of resistor R15 is electrically connected to the second terminal of resistor R12 and the first terminal of capacitor C5, respectively. The second terminal of capacitor C5 is grounded. The second terminal of capacitor C2 is electrically connected to the second terminal of resistor R12, the output terminal of amplifier U1A, the first terminal of resistor R19, and the non-inverting input terminal of amplifier U1B, respectively. The second terminal of resistor R14 is electrically connected to the inverting input terminal of resistor R14 and the first terminal of capacitor C2, respectively. The first terminal of resistor R16, the first terminal of capacitor C4, the first terminal of diode D3, and the output terminal of amplifier U1B are electrically connected; the second terminal of resistor R16 is electrically connected to the second terminal of capacitor C4, the inverting input terminal of U1B, and the first terminal of resistor R18; the second terminal of resistor R18 is grounded through capacitor C7, and the second terminals of resistor R19 are all grounded; the second terminal of diode D3 is electrically connected to the first terminal of capacitor C15 and the first terminal of resistor R22; the second terminal of capacitor C15 is electrically connected to the second terminal of resistor R22 and the corresponding terminal of MCU through resistor R25.

[0058] In this embodiment, the smoke detection module 21 is a key functional module of the smoke detection alarm, used to detect the smoke concentration in the environment. It converts the smoke signal into an electrical signal through the smoke detection circuit and transmits it to the main control module for processing. The smoke detection circuit includes a voltage regulator circuit and an operational amplifier circuit. The voltage regulator circuit provides a stable voltage to the detection circuit, and the operational amplifier circuit amplifies the smoke signal to ensure that the signal can be accurately identified by the main control module. The smoke detection module 21 can quickly and accurately detect the smoke concentration in the environment. When the smoke concentration exceeds a preset threshold, it promptly sends a signal to the main control module 20, triggering an alarm. Its high sensitivity and high accuracy enable the alarm to issue a timely warning in the early stages of a fire, ensuring the safety of people and property.

[0059] Furthermore, the human infrared detection module 220 includes an infrared receiver PY1, resistors R32 and R40, capacitors C26 and C27, and diode D4. The first pin of the infrared receiver PY1 is electrically connected to the first terminals of capacitors C26 and C27, and the corresponding terminal of the MCU. The second terminals of capacitors C26 and C27 are both grounded. The second pin of the infrared receiver PY1 is electrically connected to the first terminals of resistors R32 and D4, and the third pin of the infrared receiver PY1 is electrically connected to the second terminals of resistors R32 and D4. By detecting human activity, the human infrared detection module 220 can determine whether there are people in a dangerous area during a fire, thereby improving the targeting and effectiveness of the alarm.

[0060] Furthermore, the temperature detection module 25 includes a temperature detection circuit, which includes a resistor R2 and a thermistor; the resistor R2 is electrically connected to the MCU and the first terminal of the thermistor, and the second terminal of the thermistor is grounded.

[0061] In this embodiment, the temperature detection module 25 is used to detect the ambient temperature. It converts the temperature signal into an electrical signal through a temperature detection circuit and transmits it to the main control module 20 for processing. The temperature detection circuit includes a resistor and a thermistor. The resistance of the thermistor changes with temperature, thereby achieving temperature detection. The inclusion of the temperature detection module 25 allows the smoke detector to simultaneously monitor the ambient temperature. When the temperature rises abnormally, it can help determine the possibility of a fire, improving the accuracy and reliability of the alarm.

[0062] Furthermore, the CAT1 communication module 26 includes a CAT1 communication circuit, which comprises an ML307A chip and its peripheral circuitry. The CAT1 communication module 26 enables remote communication: through the integrated ML307A chip, the alarm can access a cellular network to achieve remote data transmission, including real-time transmission of fire alarm information. This enhances the reliability of the alarm system: the wide coverage and stability of the cellular network make alarm information transmission more reliable, allowing it to function normally even without Wi-Fi or other local area networks. Fast network connectivity enables alarm information to be quickly transmitted to the monitoring center or relevant personnel, improving fire response speed. The CAT1 module boost power supply circuit 27 includes a boost chip AH6910 and its peripheral circuitry, with the corresponding terminal of the AH6910 electrically connected to the corresponding terminal of the MCU.

[0063] Furthermore, the AT serial port circuit 28 includes an AT serial port circuit one and an AT serial port circuit two electrically connected to the corresponding terminals of the AT serial port circuit one. The AT serial port circuit one includes a transistor Q5, a resistor R21, and a resistor R27. The base of the transistor Q5 is electrically connected to the first terminal of the resistor R21, the emitter of the transistor Q5 is electrically connected to the corresponding terminal of the MCU, and the collector of the transistor Q5 is electrically connected to the ML307A chip and the first terminal of the resistor R27. The second terminal of the resistor R27 is electrically connected to the second terminal of the resistor R21 and the corresponding terminal of the AT serial port circuit two. The AT serial port circuit two includes a transistor Q6, a resistor R31, and a resistor R35. The base of the transistor Q6 is electrically connected to the second terminal of the resistor R27 via the resistor R31, the emitter is electrically connected to the corresponding terminal of the ML307A chip, and the collector is electrically connected to the corresponding terminal of the MCU and the first terminal of the resistor R35. The second terminal of the resistor R35 is electrically connected to the corresponding terminal of the MCU. In this embodiment, the AT serial port circuit 28 serves to enable serial communication between the main control module (MCU) and the CAT1 module (ML307A chip). It provides a reliable physical interface for data transmission and command control.

[0064] Through serial communication, the MCU can configure the network parameters of the ML307A chip, send and receive data, ensure stable data transmission between the MCU and the ML307A chip, and reduce data loss and errors.

[0065] Furthermore, the buzzer module 3 includes a buzzer circuit comprising resistors R10 and R11, transistor Q2, diode D1, inductor L1, and buzzer BZ1. The first terminal of resistor R10 is electrically connected to the corresponding terminal of the MCU. The second terminal of resistor R10 is electrically connected to the first terminal of resistor R11 and the base of transistor Q2. The emitter of transistor Q2 is electrically connected via diode D1 to the first terminal of inductor L1, the collector of transistor Q2, and the first pin of buzzer BZ1. The second terminal of inductor L1 is electrically connected to the second pin of buzzer BZ1. In this embodiment, the buzzer module 3 is used to emit an alarm sound. When the main control module 20 receives a smoke detection module 25, the buzzer module 3 will emit a high-decibel alarm sound to alert the user of a fire or other dangerous situation. By emitting a high-decibel alarm sound, the buzzer module 3 can promptly remind the user to take measures to prevent the fire from escalating and to ensure the safety of personnel and property.

[0066] Working principle of this utility model:

[0067] Smoke detection:

[0068] The smoke detection module 21 continuously monitors the concentration of smoke particles in the environment. When the smoke concentration exceeds a preset threshold, it outputs a signal to the main control module 20. The main control module 20 processes the signal and determines whether an alarm needs to be triggered.

[0069] Human body infrared detection:

[0070] The infrared receiver PY1 in the human body infrared detection module 220 detects changes in infrared radiation in the environment.

[0071] When human activity is detected, PY1 outputs a signal to the main control module 20. The main control module 20 determines whether there are people present based on the received signal and decides whether to send a notification or adjust the alarm strategy.

[0072] Temperature monitoring:

[0073] The temperature detection module 25 monitors the ambient temperature. If the temperature rises abnormally, it sends a signal to the main control module 20. The main control module 20 analyzes the temperature change to help determine the possibility of a fire and decides whether to trigger an alarm.

[0074] Infrared communication:

[0075] The infrared signal receiving module 22 receives signals from the remote control or other infrared devices.

[0076] The received signal is sent to the main control module 20, and the main control module 20 executes the corresponding control command.

[0077] Internet of Things (IoT) communication:

[0078] The ML307A chip in the CAT1 communication module 26 operates with a stable power supply provided by the CAT1 module boost power supply circuit (27). The ML307A chip communicates with the main control module through the AT serial port circuit 28 to send and receive data. When the main control module 20 receives a fire alarm signal, it sends a command to the ML307A chip through the AT serial port circuit, and sends the alarm information to the monitoring center or user's mobile phone through the cellular network.

[0079] Alarm triggered:

[0080] When the main control module 20 confirms that a fire has occurred (based on smoke, temperature and / or human infrared signals), it activates the buzzer module 3 to issue an audible and visual alarm.

[0081] Meanwhile, the main control module 20 sends alarm information to the remote monitoring system through the CAT1 communication module 26.

[0082] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A stand-alone photoelectric smoke detector and alarm, characterized in that, include: The package includes a front shell, a bottom shell that fits the front shell, a Fresnel lens on the front shell, a PCB board with a maze between the front and bottom shells, a buzzer module, an EVE ring on the maze, a mounting plate that is connected to the bottom shell by a snap-fit ​​mechanism, positive and negative electrode plates in the battery compartment at the bottom of the bottom shell, a leak-proof cartridge pin and a leak-proof switch, and a battery placed on the positive and negative electrode plates. The PCB board is equipped with a main control module, a smoke detection module, a human infrared detection module, an infrared signal receiving module, a temperature detection module, an infrared transmitting module, a CAT1 communication module, a SIM card module, a CAT1 module boost power supply module, a program burning port module, an AT serial port circuit for MCU and CAT1 communication module, and a module firmware download circuit. The main control module is electrically connected to the smoke detection module, human infrared detection module, infrared signal receiving module, temperature detection module, infrared emitting module, CAT1 communication module, CAT1 module boost power supply module, program burning port module, AT serial port circuit, buzzer module, and battery corresponding terminals, respectively. The corresponding terminals of the CAT1 communication module are electrically connected to the corresponding terminals of the SIM card module, the AT serial port circuit, and the module firmware download circuit, respectively.

2. The stand-alone photoelectric smoke detector and alarm according to claim 1, characterized in that, The faceplate has an opening in the middle, one end of the maze passes through the opening, and the EVE ring is placed at the opening; the bottom of the mounting plate has four buckles, and correspondingly, the faceplate has four slots that fit the four buckles.

3. The stand-alone photoelectric smoke detector and alarm according to claim 1, characterized in that, The main control module includes an MCU and its peripheral circuits, and an LED alarm indicator that is electrically connected to the corresponding end of the MCU. The model of the MCU is PY32L020F15P.

4. The stand-alone photoelectric smoke detector and alarm according to claim 3, characterized in that, The smoke detection module includes a smoke detection circuit, which includes a voltage regulator circuit and an operational amplifier circuit electrically connected to the corresponding terminal of the voltage regulator circuit; the corresponding terminals of the voltage regulator circuit and the operational amplifier circuit are both electrically connected to the corresponding terminals of the MCU.

5. The stand-alone photoelectric smoke detector and alarm according to claim 4, characterized in that, The human infrared detection module includes an infrared receiver PY1, resistors R32 and R40, capacitors C26 and C27, and diode D4. The first pin of the infrared receiver PY1 is electrically connected to the first terminal of capacitor C26, the first terminal of capacitor C27, and the corresponding terminal of the MCU. The second terminals of capacitors C26 and C27 are both grounded. The second pin of the infrared receiver PY1 is electrically connected to the first terminal of resistor R32 and the first terminal of diode D4. The third pin of the infrared receiver PY1 is electrically connected to the second terminal of resistor R32 and the second terminal of diode D4.

6. The stand-alone photoelectric smoke detector and alarm according to claim 5, characterized in that, The temperature detection module includes a temperature detection circuit, which includes a resistor R2 and a thermistor. The resistor R2 is electrically connected to the MCU and the first terminal of the thermistor, and the second terminal of the thermistor is grounded.

7. The stand-alone photoelectric smoke detector and alarm according to claim 1, characterized in that, The CAT1 communication module includes a CAT1 communication circuit, which includes an ML307A chip and its peripheral circuits.

8. The stand-alone photoelectric smoke detector and alarm according to claim 6, characterized in that, The CAT1 module boost power supply circuit includes a boost chip AH6910 and its peripheral circuits. The corresponding terminal of the boost chip AH6910 is electrically connected to the corresponding terminal of the MCU.

9. The stand-alone photoelectric smoke detector and alarm according to claim 8, characterized in that, The AT serial port circuit includes AT serial port circuit one and AT serial port circuit two, which are electrically connected to the corresponding terminals of AT serial port circuit one. The first AT serial port circuit includes a transistor Q5, a resistor R21, and a resistor R27. The base of transistor Q5 is electrically connected to the first terminal of resistor R21, the emitter of transistor Q5 is electrically connected to the corresponding terminal of the MCU, and the collector of transistor Q5 is electrically connected to the ML307A chip and the first terminal of resistor R27. The second terminal of resistor R27 is electrically connected to the second terminal of resistor R21 and the corresponding terminal of the second AT serial port circuit. The second AT serial port circuit includes a transistor Q6, a resistor R31, and a resistor R35. The base of the transistor Q6 is electrically connected to the second terminal of the resistor R27 via the resistor R31, the emitter is electrically connected to the corresponding terminal of the ML307A chip, and the collector is electrically connected to the corresponding terminal of the MCU and the first terminal of the resistor R35. The second terminal of the resistor R35 is electrically connected to the corresponding terminal of the MCU.

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