thermal alarm

Abstract

This utility model provides a thermal alarm, including: a detection box and a thermal sensing mechanism. The detection box has a detection hole, and the thermal sensing mechanism is installed inside the detection box. The thermal sensing mechanism includes: a sensing head, an alarm buzzer, and a signal processing component. The top of the alarm buzzer is connected to the sensing head, which is located at the center of the top surface of the alarm buzzer and is vertically aligned with the detection hole. This thermal alarm optimizes the reception and guidance of thermal signals through the design of the top sensing cover and partition block of the detection box, ensuring that the sensing head can accurately receive external thermal signals from all directions. The close cooperation between the thermal sensing mechanism and the signal processing component makes signal processing rapid and accurate, enabling timely judgment of whether the thermal signal is abnormal.

Description

Technical Field

[0001] This utility model relates to alarm devices, specifically to a thermal alarm. Background Technology

[0002] A thermal alarm is a device used to detect changes in ambient temperature and issue an alarm; it is widely used in fire early warning systems.

[0003] Existing thermal alarms typically consist of a sensing element (usually a thermistor), a signal processing component, a controller, and a buzzer alarm. The sensing element and the resistor form a detection circuit. When the power supply powers the detection circuit, a voltage is generated at the connection point between the sensing element and the resistor. The resistance of the sensing element changes with temperature, thus causing a change in the voltage at the connection point. The connection point between the sensing element and the resistor is connected to the input terminal of the signal processing component. The output terminal of the signal processing component is connected to the input terminal of the controller. The output terminal of the controller is connected to the control terminal of a controllable switch, which is connected to the power supply circuit of the buzzer alarm. When the sensing element detects that the temperature is too high, a voltage signal is output at the connection point between the sensing element and the resistor. The signal processing component processes the voltage signal, mainly by amplifying and converting it from analog to digital, to obtain a digital voltage signal. The controller can recognize this digital voltage signal to determine whether the temperature is too high. If the temperature is too high, the controller outputs a high level to control the controllable switch to close, and the buzzer alarm sounds.

[0004] Although it can achieve thermal alarm, the thermal alarm still has the following drawbacks: the sensing element (usually a thermistor), signal processing components, controller and buzzer alarm device are all built into the detection box. It only needs to open a hole on the detection box to connect with the external environment. Although it can sense the temperature of the external environment, the distance from the external environment to the sensing element is different in different directions. The sensing element cannot uniformly sense the heat from all directions, which cannot meet the requirements of the actual external environment. Utility Model Content

[0005] This invention aims to provide a thermal alarm device that solves the problem in the prior art where the sensing element cannot uniformly detect heat from all directions.

[0006] To achieve the above objectives, the present invention adopts the following technical solution: The present invention provides a thermal alarm, including: a detection box and a thermal sensing mechanism. A detection hole is provided at the center of the top of the detection box. The thermal sensing mechanism is installed inside the detection box. The thermal sensing mechanism includes: a sensing head, an alarm buzzer device, and a signal processing component. The signal processing component is electrically connected to the sensing head. The top of the alarm buzzer device is connected to the sensing head. The sensing head is located at the center of the top surface of the alarm buzzer device, and the sensing head protrudes from the detection box through the detection hole, and the sensing head is connected to the outside.

[0007] Preferably, the detection box includes: a top sensing cover, a positioning mechanism, and a base; the top sensing cover includes: a cover body surrounding the thermal sensing mechanism, a sensing area on the top of the cover body, a detection hole located within the sensing area, and the information receiving end of the thermal sensing mechanism extending into the detection hole; a signal processing component mounted on a circuit board is located below the thermal sensing mechanism; the positioning mechanism is located below the circuit board, and the positioning mechanism positions the circuit board through a support component to keep the sensing head within the sensing area; the top of the positioning mechanism is connected to the base, and the base can be fastened by the cover body to enclose the thermal sensing mechanism and the positioning mechanism within the cover body, and the bottom of the base is fixed to the external wall.

[0008] Preferably, the cover is a hollow structure, and a support block is provided on the top surface of the cover; the sensing area includes: a partition block and a top cover, a first sensing through hole is opened in the middle of the top cover, a number of partition blocks are provided, and the bottom of the partition blocks are evenly distributed on the support block, the top of the partition blocks are connected through the top cover, and a second sensing through hole is formed between two adjacent partition blocks and the top cover, and the first sensing through hole and the second sensing through hole are interconnected with the inside of the cover.

[0009] Preferably, the alarm buzzer device includes: a buzzer base plate, a buzzer top plate, and a buzzer ring body, wherein the buzzer base plate and the buzzer top plate are connected through the buzzer ring body, and the buzzer base plate, the buzzer top plate, and the buzzer ring body form a buzzer cavity.

[0010] Preferably, the buzzer top plate has a buzzer hole that communicates with the buzzer cavity. A connecting arm protrudes from the end of the buzzer top plate near the buzzer hole. The connecting arm is connected to a hook-shaped buckle, and the connecting arm passes through the circuit board and is then secured to the circuit board via the hook-shaped buckle.

[0011] Preferably, the connecting arm is equipped with two wire-clamping arms, each with an arc-shaped tip. The two tips slope towards the middle of the two wire-clamping arms, with a gap between them. The wire-clamping arms are used to position the signal transmission line between the sensor head and the signal processing component. Preferably, the positioning mechanism includes a positioning base, support arms, and a battery slot. The positioning base is located below the circuit board, and several support arms are connected to the positioning base. The upper end of each support arm supports the bottom of the circuit board, and a plug protrudes from the upper surface of the support arm. A positioning hole is provided along the outer edge of the circuit board for the plug to pass through. A plug is provided at the bottom of the support block, and the battery slot is used to install a battery, which provides power to the circuit board.

[0012] Preferably, the top surface of the base has a protruding positioning ring, the bottom of the positioning seat can be inserted into the positioning ring, the bottom of the base has an installation hole, and the base is fixed to the external wall surface by bolts through the installation hole.

[0013] Compared to existing technologies, this invention offers the following advantages: This thermal alarm uses a sensing head made of a thermistor or similar material to sense temperature changes, resulting in a voltage change at the end of the sensing head. The controller detects this voltage change to drive the alarm buzzer, achieving efficient and stable thermal signal monitoring and alarm functions. The detection hole in the detection box allows the sensing head to protrude from it, ensuring equal distances from the external environment to the sensing head in all directions. This allows the sensing head to detect temperatures from all directions outside the detection box, avoiding the inability to detect temperatures from only one direction, which could lead to insufficient environmental sensitivity. Since the external environment may have one side of the detection box that is hotter than another, the sensing head protrudes from the detection hole at the top center of the detection box. The sensing head is installed using the alarm buzzer, reducing the need for other components to support it at the center of the detection box, thus reducing the space occupied by other components and decreasing the overall size of the detection box.

[0014] Other advantages, objectives and features of this invention will be partly apparent from the following description, and partly understood by those skilled in the art through study and practice of this invention. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of a thermal alarm.

[0016] Figure 2 This is an exploded view of the thermal alarm device outside the enclosure.

[0017] Figure 3 This is a cross-sectional view of a thermal alarm.

[0018] Reference numerals: Detection box 1, Detection hole 11, Top sensor cover 12, Sensing area 121, Divider block 1211, Top cover 1212, Cover body 122, Support block 1221, Insert 1222, Positioning mechanism 13, Positioning seat 131, Support arm 132, Plug 1321, Battery slot 133, Base 14, Positioning ring 141, Thermal sensing mechanism 2, Sensor head 21, Alarm buzzer device 22, Buzzer base plate 221, Buzzer top plate 222, Buzzer ring body 223, Buzzer hole 224, Connecting arm 225, Hook buckle 226, Cable clamping arm 227, Buzzer cavity 228, Circuit board 231, First sensing through hole 31, Second sensing through hole 32. Detailed Implementation

[0019] To make the technical means, creative features, achieved objectives and functions of this utility model clearer and easier to understand, the utility model will be further described below with reference to the accompanying drawings and specific embodiments:

[0020] like Figure 1 and Figure 3As shown, this utility model proposes a thermal alarm, including: a detection box 1 and a thermal sensing mechanism 2. The detection box 1 is provided with a detection hole 11. The thermal sensing mechanism 2 is installed inside the detection box 1. The thermal sensing mechanism 2 includes: a sensing head 21, an alarm buzzer device 22 and a signal processing component. The top of the alarm buzzer device 22 is connected to the sensing head 21. The sensing head 21 is located at the center of the top surface of the alarm buzzer device 22, and the sensing head 21 is vertically aligned with the detection hole 11.

[0021] The sensing head 21 includes a positioning ring and a sensing element. The sensing element is installed inside the positioning ring and receives thermal signals (such as temperature changes or thermal radiation) from the external environment through a detection hole. The sensing element is typically a thermistor (such as a thermistor or thermopile) that can convert thermal signals into electrical signals.

[0022] The power supply circuit consists of batteries, etc. The first output terminal of the power supply circuit is connected to the first terminal of the inductive element, and the second terminal of the inductive element is grounded through a fixed resistor (the resistance value is constant). The second terminal of the inductive element is the output terminal of the sensing head 21.

[0023] The signal processing component may include an amplifier and an AD converter. The input of the amplifier is connected to the output of the sensor 21. The output of the sensor 21 outputs a voltage signal that changes with temperature. The amplifier amplifies the voltage signal. The output of the amplifier is connected to the input of the AD converter. The AD converter is used to convert the voltage signal from analog to digital form.

[0024] The output of the AD converter is the output of the signal processing component. The output of the signal processing component is connected to the input of the controller (which can be an STM32 series chip). The output of the controller is connected to the control terminal of the drive circuit. The first output of the power supply circuit is connected to the alarm buzzer 22 through the drive circuit. The drive circuit can be a switching transistor or a ULN2003D chip. This enables the controller to control whether the alarm buzzer 22 is connected to the first output of the power supply circuit through the switching drive circuit. This allows the controller to control the alarm buzzer 22 to sound an alarm only when the temperature is too high.

[0025] The signal processing component (circuit board 231) receives the electrical signal output by the sensor head 21, amplifies, filters and analyzes it, and determines whether the thermal signal is abnormal by a preset algorithm (this algorithm is not protected by this application, but is a known program) or a threshold.

[0026] The detection box 1 includes: a top sensing cover 12, a positioning mechanism 13, and a base 14; the top sensing cover 12 includes: a cover body 122, which surrounds the thermal sensing mechanism 2, and a sensing area 121 is provided on the top of the cover body 122. A detection hole 11 is located in the sensing area 121, and the information receiving end of the thermal sensing mechanism 2 extends into the detection hole 11; a signal processing component is provided below the thermal sensing mechanism 2, and the signal processing component is mounted on a circuit board 231; the positioning mechanism 13 is located below the circuit board 231, and the positioning mechanism 13 positions the circuit board 231 through a support component to keep the sensing head 21 located in the sensing area 121; the top of the positioning mechanism 13 is connected to the base 14, and the base 14 can be fastened by the cover body 122 to surround the thermal sensing mechanism 2 and the positioning mechanism 13 within the cover body 122, and the bottom of the base 14 is fixed to the external wall.

[0027] The top sensing cover 122 surrounds the thermal sensing mechanism 2, forming a relatively enclosed space to reduce external interference and guide the thermal signal through the detection hole 11. The detection hole 11 is located within the sensing area 121, and the sensing head 21 extends into the external environment through the detection hole 11 to directly receive the thermal signal. The sensing head 21 typically uses a thermistor, which can convert the thermal signal into an electrical signal. The structural design of the sensing area 121 allows the sensing head 21 to sense the temperature in all directions of the external environment and also protects the sensing head 21.

[0028] The cover 122 has a hollow structure, and a support block 1221 is provided on the top surface of the cover 122. The sensing area 121 includes: a partition block 1211 and a top cover 1212. A first sensing through hole 31 is opened in the middle of the top cover 1212. Several partition blocks 1211 are provided, and the bottom of the partition blocks 1211 is evenly distributed on the support block 1221. The top of the partition blocks 1211 is connected through the top cover 1212. A second sensing through hole 32 is formed between two adjacent partition blocks 1211 and the top cover 1212. The first sensing through hole 31 and the second sensing through hole 32 are interconnected with the inside of the cover 122.

[0029] The hollow structure of the cover 122 provides a relatively enclosed receiving environment for the thermal signal, reducing external interference; the first sensing through hole 31 and the second sensing through hole 32 form a thermal signal channel, ensuring that the thermal signal can enter the sensing area 121 evenly; the design of the separator block 1211 helps to guide the thermal signal, making it evenly distributed and improving the detection accuracy of the sensing head 21.

[0030] like Figure 2 As shown, the alarm buzzer device 22 includes: a buzzer base plate 221, a buzzer top plate 222, and a buzzer ring body 223. The buzzer base plate 221 and the buzzer top plate 222 are connected through the buzzer ring body 223, and the buzzer base plate 221, the buzzer top plate 222, and the buzzer ring body 223 form a buzzer cavity 228.

[0031] The buzzer top plate 222 receives electrical signals from the signal processing component through the signal transmission line; the electrical signals are usually AC signals, which are used to drive the vibrating element inside the buzzer device. The vibration generates sound waves in the buzzer cavity 228, and the sound waves are transmitted to the outside through the buzzer hole 224 on the buzzer top plate 222 and the first sensing through hole 31 and the second sensing through hole 32.

[0032] The buzzer top plate 222 has a buzzer hole 224, which is connected to the buzzer cavity 228. A connecting arm 225 protrudes from one end of the buzzer top plate 222 near the buzzer hole 224. The connecting arm 225 is connected to a hook-shaped buckle 226. The connecting arm passes through the circuit board and is then connected by the hook-shaped buckle 226.

[0033] The design of the connecting arm 225 and the signal transmission arm ensures a stable wire connection between the sensor head 21 and the signal processing component. The hook-shaped buckle 226 is movably connected to the circuit board 231, providing a flexible installation and maintenance method while ensuring the reliability of signal transmission. The design of the buzzer cavity 228 optimizes the propagation effect of sound waves, ensuring that the alarm sound is clearly audible.

[0034] The connecting arm 225 is provided with a wire clamping arm 227. There are two wire clamping arms 227. The top of the wire clamping arm 227 is an arc-shaped structure. The two tops are inclined towards the middle of the two wire clamping arms 227, and a gap is left between the two tops. The wire clamping arm 227 is used to position the signal transmission line between the sensing head 21 and the signal processing component.

[0035] The connecting arm 225 is equipped with two wire clamping arms 227. The top of the wire clamping arm 227 is arc-shaped and tilts towards the middle of the two wire clamping arms 227 to form a clamp-like structure. There is a gap between the tops of the two wire clamping arms 227 to allow the signal transmission line to pass through and be clamped and fixed. The design of the wire clamping arm 227 ensures that the signal transmission line is stably fixed on the connecting arm 225, preventing the signal transmission line from loosening or falling off due to external factors, vibration, or pulling. The arc-shaped structure and tilted design allow the wire clamping arm 227 to adapt to signal transmission lines of different diameters, providing a flexible fixing method.

[0036] The positioning mechanism 13 includes a positioning seat 131, a support arm 132, and a battery slot 133. The positioning seat 131 is located below the circuit board 231. Several support arms 132 are connected to the positioning seat 131. The upper end of the support arm 132 is used to support the bottom of the circuit board 231. A plug 1321 protrudes from the upper end face of the support arm 132. The outer edge of the circuit board 231 has a positioning hole for the plug 1321 to pass through. The bottom of the support block 1221 is provided with a plug tube 1222. The plug 1321 can be inserted into the plug tube 1222. The battery slot 133 is used to install a battery, which provides power to the circuit board 231.

[0037] Place the circuit board 231 above the positioning base 131, so that the plug 1321 at the upper end of the support arm 132 passes through the positioning hole on the outer edge of the circuit board 231, and insert the plug 1321 into the insert 1222 at the bottom of the support block 1221 to ensure that the circuit board 231 is firmly connected to the positioning base 131. Install the battery in the battery slot 133, and the battery provides power to the circuit board 231. After the circuit board 231 is powered on, it begins to work normally and processes the electrical signals output by the sensor head 21.

[0038] The top surface of the base 14 has a protruding positioning ring 141, and the bottom of the positioning seat 131 can be inserted into the positioning ring 141. The bottom of the base 14 has an installation hole, and the base 14 is fixed to the external wall surface by bolts through the installation hole.

[0039] Insert the bottom of the positioning seat 131 into the positioning ring 141 on the top surface of the base 14 to ensure a stable connection between the positioning seat 131 and the base 14. The design of the positioning ring 141 ensures that the positioning seat 131 is accurately aligned during installation, simplifying the installation steps. The base 14 is fixed to the wall with bolts, providing physical support for the entire device. The cooperation between the positioning ring 141 and the positioning seat 131 enhances the stability of the internal components of the thermal alarm.

[0040] In this application, the assembly steps of the thermal alarm are as follows: First, prepare the detection box 1, positioning mechanism 13, circuit board 231 (with signal processing components, drive circuit, etc. already soldered on), alarm buzzer 22, and sensor head 21; then, install the alarm buzzer 22 on the circuit board 231. The connecting arm 225 of the alarm buzzer 22 passes through the circuit board 231 and hooks the circuit board 231 with a hook-shaped buckle 226 to form a snap-fit ​​connection. In this way, the alarm buzzer 22 is stacked on the circuit board 231 and the relative position of the circuit board 231 and the alarm buzzer 22 is fixed. The buzzer top plate 222 of the alarm buzzer 22 is fixed to the positioning ring of the sensor head 21, and the buzzer top plate 222 is fixed to the positioning ring of the sensor head 21. The positioning ring is integrally molded during manufacturing. Then, the sensing element of the sensor head 21 is installed in the positioning ring fixed to the buzzer top plate 222 to achieve positioning of the sensing element. Next, the sensing element of the sensor head 21 is connected to the circuit on the circuit board through a signal transmission line, and the signal transmission line is placed in the wire clamp arm 227 to prevent the signal transmission line from moving or falling off at will. Then, the circuit board 231 is placed on the positioning mechanism 13. The plug 1321 in the positioning mechanism aligns the circuit board 231 with the positioning mechanism. Since the alarm buzzer device 22 and the positioning ring are already aligned with the circuit board 231, the positioning mechanism is used to align the positioning sensor head with the detection hole 11 of the detection box 1. This overlapping assembly positioning mechanism 13, circuit board 231 (with signal processing components, drive circuit, etc. already soldered), alarm buzzer device 22, and sensor head 21, allows the detection hole 11 to not only transmit the alarm sound emitted by the alarm buzzer device 22, but also to align the sensor head 21 with the detection hole 11. The positioning ring in the sensor head 21 is fixed to the buzzer top plate 222 in the alarm buzzer device 22. The buzzer top plate 222 is used to position the sensor head 21, so that the sensor head 21 will not deviate from the detection hole 11.

[0041] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit it. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the spirit and scope of the technical solutions of this utility model, and all such modifications or substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A heat alarm, characterised in that, include: The detection box (1) and the thermal sensing mechanism (2) are provided. The detection box (1) has a detection hole (11) at the center of its top. The thermal sensing mechanism (2) is installed inside the detection box (1). The thermal sensing mechanism (2) includes: a sensing head (21), an alarm buzzer (22) and a signal processing component. The signal processing component is electrically connected to the sensing head (21). The top of the alarm buzzer (22) is connected to the sensing head (21). The sensing head (21) is located at the center of the top surface of the alarm buzzer (22). The sensing head (21) protrudes from the detection box through the detection hole (11) and is connected to the outside.

2. The heat alarm of claim 1, wherein The detection box (1) includes: a top sensor cover (12), a positioning mechanism (13), and a base (14); The top sensing cover (12) includes: a cover body (122), the cover body (122) surrounds the heat sensing mechanism (2), a sensing area (121) is provided above the cover body (122), a detection hole (11) is located in the sensing area (121), and the information receiving end of the heat sensing mechanism (2) extends into the detection hole (11). A signal processing component is mounted on a circuit board (231) below the thermal sensing mechanism (2); The positioning mechanism (13) is located below the circuit board (231). The positioning mechanism (13) positions the circuit board (231) through the support component to keep the sensor head (21) within the sensing area (121). The top of the positioning mechanism (13) is connected to the base (14), and the base (14) can be fastened by the cover (122) to surround the heat sensing mechanism (2) and the positioning mechanism (13) inside the cover (122). The bottom of the base (14) is fixed to the external wall.

3. The heat alarm of claim 2, wherein, The cover (122) has a hollow structure, and a support block (1221) is provided on the top surface of the cover (122); The sensing area (121) includes: a partition block (1211) and a top cover (1212). The top cover (1212) has a first sensing through hole (31) in the middle. There are several partition blocks (1211), and the bottom of the partition blocks (1211) is evenly distributed on the support block (1221). The top of the partition blocks (1211) is connected through the top cover (1212). A second sensing through hole (32) is formed between two adjacent partition blocks (1211) and the top cover (1212). The first sensing through hole (31) and the second sensing through hole (32) are interconnected with the inside of the cover (122).

4. The heat alarm of claim 3, wherein The alarm buzzer device (22) includes: a buzzer base plate (221), a buzzer top plate (222), and a buzzer ring (223). The buzzer base plate (221) and the buzzer top plate (222) are connected through the buzzer ring (223). The buzzer base plate (221), the buzzer top plate (222), and the buzzer ring (223) form a buzzer cavity (228).

5. The heat alarm of claim 4, wherein, The buzzer top plate (222) has a buzzer hole (224) which is connected to the buzzer cavity (228). The buzzer top plate (222) has a protruding connecting arm (225) with a hook-shaped buckle (226) at the lower end. The circuit board (231) is snapped together with the circuit board (231) through the hook-shaped buckle (226).

6. The heat alarm of claim 5, wherein, The connecting arm (225) is provided with a wire clamping arm (227). There are two wire clamping arms (227). The top of the wire clamping arm (227) is an arc-shaped structure. The two top ends are inclined towards the middle of the two wire clamping arms (227). There is a gap between the two top ends. The wire clamping arm (227) is used to position the signal transmission line between the sensing head (21) and the signal processing component.

7. The heat alarm of claim 6 wherein, The positioning mechanism (13) includes: a positioning seat (131), a support arm (132) and a battery slot (133). The positioning seat (131) is located below the circuit board (231). Several support arms (132) are connected to the positioning seat (131). The upper end of the support arm (132) is used to support the bottom of the circuit board (231). A plug (1321) protrudes from the upper end face of the support arm (132). The outer edge of the circuit board (231) has a positioning hole for the plug (1321) to pass through. The bottom of the support block (1221) is provided with a tube (1222). The plug (1321) can be inserted into the tube (1222). The battery slot (133) is used to install a battery. The battery provides power to the circuit board (231).

8. The heat alarm of claim 7, wherein, The top surface of the base (14) has a protruding positioning ring (141), and the bottom of the positioning seat (131) can be inserted into the positioning ring (141). The bottom of the base (14) has an installation hole, and the base (14) is fixed to the external wall surface by bolts through the installation hole.

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