Point-type photoelectric smoke-sensing fire detector for fire alarm

Abstract

The utility model relates to the technical field of fire-fighting alarm, in particular to a point-type photoelectric smoke-sensing fire detector for fire-fighting alarm, which comprises an outer shell, an induction mechanism is fixedly mounted in the middle of the lower end of the outer shell in a penetrating manner, and a mounting mechanism is fixedly connected to the upper part of the outer surface of the outer shell. An adjusting mechanism is jointly inserted and mounted on the periphery of the lower shell wall of the mounting mechanism; the adjusting mechanism comprises a sealing plate, the outer surface of the adjusting cabin is fixedly connected with a plurality of heat dissipation fins in a penetrating mode, and the sealing plate is installed on the upper portion of the inner shell wall of the outer shell in an inserted mode. The smoke detector adapts to complex temperature and humidity environments, reduces false alarms, realizes efficient and accurate detection of smoke by means of a semi-arc-shaped induction groove, an insect-proof net and the like of the induction mechanism, is flexible and convenient to install by means of a slidable installation lug plate in the installation mechanism, can meet diversified scene requirements, and expands the application range.

Description

Technical Field

[0001] This utility model relates to the field of fire alarm technology, and in particular to a point-type photoelectric smoke detector for fire alarms. Background Technology

[0002] In the field of fire alarm, point-type photoelectric smoke detectors play a key role. For example, the patent document with announcement number CN205354261U discloses a point-type photoelectric smoke detector. Although the point-type photoelectric smoke detector disclosed there are some improvements in the design of the smoke chamber and the connection method with the fire alarm controller, such as increasing the diameter and height of the smoke chamber to increase the amount of smoke and dust stored, and using conductive columns and conductive elastic components to improve stability, there are still many technical defects.

[0003] The existing technology is inadequate in dealing with complex environments. It has poor adaptability to changes in ambient temperature and humidity. When the ambient temperature and humidity exceed the normal range, the optical and electronic components inside the detector are easily affected, leading to a decrease in detection accuracy or even false alarms. For example, in the humid plum rain season in the south, excessive humidity may cause water vapor to condense on the surface of optical components, interfering with light propagation and affecting the detection of smoke particles. From a structural design perspective, the existing technology lacks flexibility and has a relatively simple installation method. Its mounting ears are usually fixed in a specific position, and it is impossible to flexibly adjust the installation angle and position according to the actual installation scenario, which limits the application of the detector in different building structures and spatial layouts. Therefore, we have introduced a point-type photoelectric smoke detector for fire alarms. Utility Model Content

[0004] The main objective of this invention is to provide a point-type photoelectric smoke detector for fire alarms, which can effectively solve the problems in the background technology.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0006] A point-type photoelectric smoke detector for fire alarm includes an outer shell, a sensing mechanism is fixedly installed in the middle of the lower end of the outer shell, an installation mechanism is fixedly connected to the upper part of the outer surface of the outer shell, and an adjustment mechanism is inserted and installed around the lower shell wall of the installation mechanism.

[0007] The adjustment mechanism includes a sealing plate, five insert rods are fixedly connected to the four corners of the lower end of the sealing plate, an adjustment chamber is fixedly installed in the middle of the lower end of the sealing plate, a thermally conductive silicone pad is fixedly connected to the bottom of the adjustment chamber, several heating wires are wound around the outer surface of the adjustment chamber, several heat dissipation fins are inserted and fixedly connected to the outer surface of the adjustment chamber, and the sealing plate is inserted and installed on the upper part of the inner shell wall of the outer shell.

[0008] Preferably, the sensing mechanism includes a bottom shell, with several sensing slots around the lower end of the bottom shell, a channel shell fixedly connected to the upper center of the bottom shell, an insect-proof net provided on the lower part of the outer surface of the channel shell, an indicator light provided on one side of the bottom of the bottom shell, a circuit board snapped onto the inner shell wall of the channel shell, three clips fixedly connected to the outer surface of the circuit board, multiple sensor modules provided at the lower end of the circuit board, and the bottom shell located directly below the outer shell.

[0009] Preferably, the mounting mechanism includes a housing ring rail, three mounting lugs are slidably mounted on the outer surface of the housing ring rail, each of the three mounting lugs has an adjustment groove on its inner side, and each mounting lug has a mounting hole at its lower end. The housing ring rail is fixedly connected to the upper part of the outer surface of the housing.

[0010] Preferably, several connecting pieces are fixedly installed around the lower end of the outer shell and around the outer side of the bottom shell. Several heat-conducting metal fins are interlaced on the upper surface of the outer shell. Five insertion holes are opened around the lower shell wall of the outer shell. A connecting groove is opened in the middle of the bottom of the outer shell.

[0011] Preferably, the positional dimensions of the five insertion rods correspond one-to-one with the positional dimensions of the five insertion holes, and the plurality of heat dissipation fins are arranged in a ring array with the adjustment chamber as the center.

[0012] Preferably, each of the induction slots has a semi-arc structure, the channel shell is fixedly installed on the inner wall of the connecting slot, the insect-proof net covers the lower part of the outer surface of the channel shell, and the edge of the insect-proof net is tightly fixed to the outer surface of the channel shell, the light emission direction of the indicator light is towards the radial outer side of the bottom shell, and the probes of the multiple sensor modules are coaxial with the opening direction of the induction slot.

[0013] Preferably, the extension direction of the heat dissipation fins is parallel to the radial direction of the outer shell, and the distance between the end of the outermost heat dissipation fin and the inner wall of the outer shell is 3mm. The winding density of the heating wire coil increases from top to bottom along the axial direction of the adjustment chamber.

[0014] Preferably, when the mounting ear plate slides on the outer shell ring rail, the adjusting groove always remains in contact with the outer surface of the outer shell ring rail, and the axial direction of the mounting hole is perpendicular to the plane where the mounting ear plate is located.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. In this utility model, to address the problem of poor adaptability of existing technologies to changes in environmental temperature and humidity, an adjustment mechanism is designed. The heating wire coil wound around the outside of the adjustment chamber has an increasing winding density along the axial direction from top to bottom, which can efficiently increase the temperature in low-temperature environments. The heat dissipation fins are arranged in a ring array and extend in a direction parallel to the radial direction of the outer shell. The outermost fin ends maintain a 3mm gap with the inner wall, which can quickly dissipate heat at high temperatures. The thermally conductive silicone pad at the bottom is in close contact with the internal components to transfer heat. Together with the thermally conductive metal fins on the upper part of the outer surface of the outer shell, the appropriate working temperature inside the detector is maintained in all directions, effectively preventing the optical and electronic components from being affected by changes in temperature and humidity, greatly improving detection accuracy, reducing false alarms, and ensuring stable operation in complex environments.

[0017] 2. In this utility model, the sensing mechanism of the detector has significant advantages in smoke detection. The sensing groove with a semi-circular structure around the lower end of the bottom shell increases the area and probability of smoke entering, improving the capture efficiency. The lower part of the outer surface of the channel shell is covered with a tightly fixed insect-proof net, which effectively avoids mosquitoes interfering with the internal components and ensures the stability of operation. The circuit board is stably installed in the channel shell by three clips. The sensor module probe at its lower end is coaxial with the opening of the sensing groove, which can accurately detect the scattering or blocking of light by smoke particles, accurately perceive the smoke concentration, and achieve efficient and accurate smoke detection, providing a solid guarantee for fire early warning.

[0018] 3. In this utility model, the installation mechanism of the detector is ingeniously designed. The outer ring rail is fixed to the upper part of the outer surface of the outer shell, and the three mounting ears can slide flexibly on its outer surface. During sliding, the adjustment groove is always in contact with the outer ring rail to ensure stability. The axis of the mounting hole at the lower end of the mounting ears is perpendicular to the plane. Users can use the connector to install the detector in different positions through the mounting hole, and can flexibly adjust the installation angle according to the actual scene requirements. For example, the best installation position can be found in irregular ceiling corners or near walls with obstacles, meeting the needs of diverse installation scenarios, greatly improving the flexibility and convenience of installation, and effectively expanding the application range of the detector. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the overall structure of a point-type photoelectric smoke detector for fire alarm according to this utility model;

[0020] Figure 2 This is a schematic diagram of the overall small explosion structure of a point-type photoelectric smoke detector for fire alarm according to this utility model;

[0021] Figure 3 This is a partial structural schematic diagram of a point-type photoelectric smoke detector for fire alarm according to this utility model;

[0022] Figure 4This is a schematic diagram showing the disassembled structure of the sensing mechanism of a point-type photoelectric smoke detector for fire alarm according to this utility model.

[0023] Figure 5 This is a schematic diagram of the adjustment mechanism of a point-type photoelectric smoke detector for fire alarm according to this utility model;

[0024] Figure 6 This is a schematic diagram of the installation mechanism of a point-type photoelectric smoke detector for fire alarms according to this utility model.

[0025] In the diagram: 1. Connecting piece; 2. Mounting mechanism; 3. Outer shell; 4. Sensing mechanism; 5. Thermally conductive metal fins; 6. Adjustment mechanism; 7. Insertion hole; 8. Connecting groove; 41. Bottom shell; 42. Sensing groove; 43. Channel shell; 44. Insect screen; 45. Indicator light; 46. Circuit board; 47. Locking block; 48. Sensor module; 61. Sealing plate; 62. Insert rod; 63. Adjustment chamber; 64. Heating coil; 65. Heat dissipation fins; 66. Thermally conductive silicone pad; 21. Outer shell rail; 22. Adjustment groove; 23. Mounting ear plate; 24. Mounting hole. Detailed Implementation

[0026] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0027] In the description of this utility model, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In addition, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0028] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," and "connected," etc., should be interpreted broadly. For example, "connected" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0029] Please see Figure 1-6 This utility model provides a technical solution:

[0030] A point-type photoelectric smoke detector for fire alarm includes an outer shell 3, a sensing mechanism 4 is fixedly installed in the middle of the lower end of the outer shell 3, an installation mechanism 2 is fixedly connected to the upper part of the outer surface of the outer shell 3, and an adjustment mechanism 6 is inserted and installed around the lower shell wall of the installation mechanism 2.

[0031] Several connecting pieces 1 are fixedly installed around the lower end of the outer shell 3 and around the outer side of the bottom shell 41. Several heat-conducting metal fins 5 are interlaced on the upper surface of the outer shell 3. Five insertion holes 7 are opened around the lower shell wall of the outer shell 3. A connecting groove 8 is opened in the middle of the bottom of the outer shell 3.

[0032] In this embodiment, the adjustment mechanism 6 includes a sealing plate 61. Five insert rods 62 are fixedly connected to the four corners of the lower end of the sealing plate 61. An adjustment chamber 63 is fixedly installed in the middle of the lower end of the sealing plate 61. A thermally conductive silicone pad 66 is fixedly connected to the bottom of the adjustment chamber 63. Several heating coils 64 are wound around the outer surface of the adjustment chamber 63. Several heat dissipation fins 65 are inserted and fixedly connected to the outer surface of the adjustment chamber 63. The sealing plate 61 is inserted and installed in the upper part of the inner wall of the outer shell 3. The position dimensions of the five insert rods 62 correspond one-to-one with the position dimensions of the five insertion holes 7. Several heat dissipation fins 65 are arranged in a ring array with the adjustment chamber 63 as the center. The extension direction of the heat dissipation fins 65 is parallel to the radial direction of the outer shell 3. The distance between the end of the outermost heat dissipation fin 65 and the inner wall of the outer shell 3 is 3mm. The winding density of the heating coils 64 increases from top to bottom along the axial direction of the adjustment chamber 63.

[0033] Through the above scheme: when changes in ambient temperature and humidity affect the operation of the detector, the sealing plate 61, with its five fixedly connected plugs 62 at the four corners of its lower end, is stably installed on the upper part of the inner shell wall of the outer shell 3 by correspondingly inserting into the five plug holes 7 on the four sides of the lower shell wall. The adjustment chamber 63 installed in the middle of the lower end of the sealing plate 61 has a thermally conductive silicone pad 66 fixed at its bottom that can closely contact the internal components of the detector and efficiently transfer heat. The heating wire coils 64 wound on the outer surface of the adjustment chamber 63 have a winding density that increases from top to bottom along the axial direction of the adjustment chamber 63. When the ambient temperature is too low, they can generate heat of different intensities after being powered on, which can more effectively improve the temperature. The temperature adjustment mechanism 6 has several heat dissipation fins 65 fixedly inserted on the outer surface of the adjustment chamber 63, arranged in a ring array with the adjustment chamber 63 as the center, and the extension direction is parallel to the radial direction of the outer shell 3. The end of the outermost heat dissipation fin 65 maintains a 3mm gap with the inner wall of the outer shell 3. When the ambient temperature is too high, it can quickly dissipate heat. This adjustment mechanism 6 can accurately regulate the internal temperature of the detector, ensuring that the internal optical and electronic components of the detector work normally in complex temperature and humidity environments, effectively improving the detector's adaptability to the environment, reducing false alarms and missed alarms caused by environmental factors, ensuring the stable and reliable operation of the detector, and providing more accurate monitoring for fire alarms.

[0034] In this embodiment, the sensing mechanism 4 includes a bottom shell 41. Several sensing slots 42 are formed around the lower end of the bottom shell 41. A channel shell 43 is fixedly connected to the middle of the upper end of the bottom shell 41. An insect-proof net 44 is provided on the lower part of the outer surface of the channel shell 43. An indicator light 45 is provided on one side of the bottom of the bottom shell 41. A circuit board 46 is snapped onto the inner shell wall of the channel shell 43. Three clips 47 are fixedly connected to the outer surface of the circuit board 46. Multiple sensor modules 48 are provided at the lower end of the circuit board 46. The bottom shell 41 is located directly below the outer shell 3. The several sensing slots 42 are all semi-arc-shaped. The channel shell 43 is fixedly installed on the inner wall of the connecting slot 8. The insect-proof net 44 covers the lower part of the outer surface of the channel shell 43, and the edge of the insect-proof net 44 is tightly fixed to the outer surface of the channel shell 43. The light emission direction of the indicator light 45 is towards the radial outer side of the bottom shell 41. The probes of the multiple sensor modules 48 are coaxial with the opening direction of the sensing slots 42.

[0035] Through the above scheme: when smoke appears in the environment, smoke particles can smoothly enter the detector through the semi-circular sensing groove 42 at the lower end of the bottom shell 41. The semi-circular sensing groove 42 design increases the area and probability of smoke entering, which is conducive to improving the smoke capture efficiency. The channel shell 43 is fixedly installed on the inner wall of the connecting groove 8 in the middle of the bottom of the outer shell 3. The insect-proof net 44 set on the lower part of its outer surface covers the circumference, and the edge is tightly fixed to the outer surface of the channel shell 43, effectively preventing mosquitoes from entering the interior of the channel shell 43, avoiding interference with the internal components, and ensuring the stability of the detector's operation. The circuit board 46 located on the inner shell wall of the channel shell 43 is tightly engaged by three evenly distributed clips 47 on the outer surface, and is stably installed inside the channel shell 43. Multiple sensor modules 48 are installed at the lower end of the circuit board 46. Their probes are coaxial with the opening of the sensing slot 42, which can accurately detect the scattering or obstruction of light by the incoming smoke particles, and thus accurately sense the smoke concentration. When the sensor module 48 detects that the smoke concentration reaches the alarm threshold, the indicator light 45 installed on one side of the bottom of the bottom shell 41 and facing the radially outward side of the bottom shell 41 will light up, clearly alerting the surrounding environment to the fire hazard, so that people can notice it in time. The design of this sensing mechanism 4 realizes efficient and accurate detection and alarm of smoke. The insect net 44 ensures the stable operation of the internal components, greatly improving the reliability and effectiveness of the detector in fire monitoring and providing a solid guarantee for fire early warning.

[0036] In this embodiment, the mounting mechanism 2 includes a housing ring rail 21. Three mounting ear plates 23 are slidably mounted on the outer surface of the housing ring rail 21. Each of the three mounting ear plates 23 has an adjustment groove 22 on its inner side and a mounting hole 24 at its lower end. The housing ring rail 21 is fixedly connected to the upper part of the outer surface of the housing 3. When the mounting ear plates 23 slide on the housing ring rail 21, the adjustment groove 22 always remains in contact with the outer surface of the housing ring rail 21, and the axial direction of the mounting hole 24 is perpendicular to the plane where the mounting ear plates 23 are located.

[0037] Through the above scheme: During the detector installation process, the outer shell ring rail 21, which is fixedly connected to the upper part of the outer surface of the outer shell 3, plays a key supporting role. The three mounting ears 23 can slide flexibly on the outer surface of the outer shell ring rail 21. When sliding, the adjustment groove 22 opened on the inner side of the mounting ears 23 always keeps in close contact with the outer surface of the outer shell ring rail 21. This design ensures the stability of the mounting ears 23 during the sliding process. The mounting hole 24 opened at the lower end of the mounting ears 23 has its axis direction perpendicular to the plane where the mounting ears 23 are located. This design allows users to conveniently install the detector in different positions through the mounting hole 24 with the help of bolts and other connecting parts. Since the mounting ears 23 can slide, the installation angle of the detector can be flexibly adjusted according to the needs of the actual installation scenario. For example, in special environments such as irregular ceiling corners or near walls with obstacles, the optimal installation position can be found and the angle adjusted by sliding the mounting ears 23 to meet the needs of diverse installation scenarios. This greatly improves the flexibility and convenience of detector installation, enabling the detector to better adapt to various building structures and spatial layouts, and effectively expands its application range.

[0038] It should be noted that this utility model is a point-type photoelectric smoke detector for fire alarms. When smoke appears in the environment, smoke particles enter the detector through the semi-circular sensing groove 42 at the lower end of the bottom shell 41. Multiple sensor modules 48 located in the channel shell 43 have their detection heads coaxial with the opening of the sensing groove 42, which can accurately detect the scattering or blocking of light by smoke particles. The insect-proof net 44 set on the lower part of the outer surface of the channel shell 43 has its edges tightly fixed to the outer surface of the channel shell 43, which can prevent mosquitoes from entering and interfering with the operation of the sensor modules 48. The circuit board 46 is evenly distributed on the outer surface. The three locking blocks 47 are tightly engaged with the inner wall of the channel shell 43 and stably installed inside the channel shell 43. They are responsible for processing the data transmitted by the sensor module 48. If the smoke concentration reaches the alarm threshold, the indicator light 45 installed on one side of the bottom of the bottom shell 41 will light up to indicate the fire hazard. Its light-emitting surface is flush with the bottom surface of the bottom shell 41 and the light-emitting direction is radially outward of the bottom shell 41. In terms of environmental adaptability, when changes in ambient temperature and humidity affect the operation of the detector, the adjustment mechanism 6 will start to function. The sealing plate 61 is installed on the upper part of the inner wall of the outer shell 3 by inserting five rods 62 at the four corners of the lower end into five holes 7 around the lower shell wall of the outer shell 3. The adjustment chamber is installed in the middle of the lower end of the sealing plate 61. The bottom of the 63 has a fixed thermally conductive silicone pad 66 that can make close contact with the internal components of the detector to transfer heat. The heating wire coil 64 wound around the outer surface of the adjustment chamber 63 has a winding density that increases from top to bottom along the axial direction of the adjustment chamber 63. When the ambient temperature is too low, it generates heat when energized to raise the temperature. The heat dissipation fins 65 fixed to the outer surface of the adjustment chamber 63 extend in a direction parallel to the radial direction of the outer shell 3, and the distance between the end of the outermost heat dissipation fin 65 and the inner wall of the outer shell 3 is 3mm. When the ambient temperature is too high, it can dissipate heat. At the same time, several thermally conductive metal fins 5 installed on the upper part of the outer surface of the outer shell 3 are arranged in a ring array, which also helps to dissipate internal heat and maintain the internal temperature of the detector. With a suitable operating temperature, the detector is installed via the mounting mechanism 2. The outer ring rail 21 is fixed to the upper part of the outer surface of the outer shell 3. The three mounting lugs 23 can slide on the outer surface of the outer ring rail 21. During the sliding process, the adjustment groove 22 is always in contact with the outer surface of the outer ring rail 21. The mounting holes 24 at the lower end of the mounting lugs 23 have an axis direction perpendicular to the plane where the mounting lugs 23 are located. The detector can be installed in different positions by bolts and other connecting parts, and the installation angle can be flexibly adjusted according to actual needs to meet diverse installation scenario requirements. The lower perimeter of the outer shell 3 and the outer perimeter of the bottom shell 41 are connected by evenly distributed connecting pieces 1 to ensure the overall structural integrity of the detector.

[0039] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claims. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A point-type photoelectric smoke fire detector for fire alarm, comprising a housing (3), characterized in that: The lower middle part of the outer shell (3) is fixedly installed with an induction mechanism (4), the upper part of the outer surface of the outer shell (3) is fixedly connected with a mounting mechanism (2), and the lower shell wall of the mounting mechanism (2) is jointly inserted and installed with an adjusting mechanism (6). The adjusting mechanism (6) comprises a sealing plate (61), the lower corners of the sealing plate (61) are fixedly connected with five insertion rods (62), the lower middle part of the sealing plate (61) is fixedly installed with an adjusting cabin (63), the bottom of the adjusting cabin (63) is fixedly connected with a heat-conducting silica gel pad (66), the outer surface of the adjusting cabin (63) is wrapped with a plurality of heating wire coils (64), the outer surface of the adjusting cabin (63) is fixedly connected with a plurality of heat dissipation fins (65), and the sealing plate (61) is inserted and installed on the upper part of the inner shell wall of the outer shell (3).

2. A point type photoelectric smoke fire detector for fire alarm according to claim 1, characterized in that: The induction mechanism (4) comprises a bottom shell (41), a plurality of induction grooves (42) are formed in the lower part of the bottom shell (41), the upper middle part of the bottom shell (41) is fixedly connected with a channel shell (43), the lower part of the outer surface of the channel shell (43) is provided with an insect screen (44), one side of the bottom of the bottom shell (41) is provided with an indicator light (45), the inner shell wall of the channel shell (43) is clampedly installed with a circuit board (46), the outer surface of the circuit board (46) is fixedly connected with three clamping blocks (47), the lower end of the circuit board (46) is provided with a plurality of sensor modules (48), and the bottom shell (41) is located directly below the outer shell (3).

3. The point-type photoelectric smoke fire detector for fire alarm according to claim 1, characterized in that: The mounting mechanism (2) comprises an outer shell ring rail (21), the outer surface of the outer shell ring rail (21) is slidably installed with three mounting ear plates (23), the inner sides of the three mounting ear plates (23) are all provided with adjusting grooves (22), the lower ends of the mounting ear plates (23) are all provided with mounting holes (24), and the outer shell ring rail (21) is fixedly connected to the upper part of the outer surface of the outer shell (3).

4. The point-type photoelectric smoke fire detector for fire alarm according to claim 1, characterized in that: The lower part of the outer shell (3) is fixedly installed with a plurality of connecting plates (1) around the outer side of the bottom shell (41), the upper part of the outer surface of the outer shell (3) is insertedly installed with a plurality of heat-conducting metal fins (5), the lower shell wall of the outer shell (3) is provided with five insertion holes (7), and the middle part of the bottom of the outer shell (3) is provided with a connecting groove (8).

5. The point-type photoelectric smoke fire detector for fire alarm according to claim 1, characterized in that: The positions and sizes of the five insertion rods (62) correspond to those of the five insertion holes (7) one by one, and a plurality of the heat dissipation fins (65) are arranged in a ring array around the adjusting cabin (63).

6. A point type photoelectric smoke fire detector for fire alarm according to claim 2, characterized in that: A plurality of the induction grooves (42) are all in a semicircular structure, the channel shell (43) is fixedly installed on the inner wall of the connecting groove (8), the insect screen (44) covers the lower part of the outer surface of the channel shell (43), the edge of the insect screen (44) is fixedly connected with the outer surface of the channel shell (43), the light emitting direction of the indicator light (45) is towards the radial outer side of the bottom shell (41), and the detection heads of a plurality of the sensor modules (48) are coaxial with the opening direction of the induction grooves (42).

7. The point-type photoelectric smoke fire detector for fire alarm according to claim 1, characterized in that: The extending direction of the heat dissipation fins (65) is parallel to the radial direction of the outer shell (3), and the distance between the end of the outermost heat dissipation fin (65) and the inner wall of the outer shell (3) is 3 mm, and the winding density of the heating wire coil (64) increases from top to bottom along the axial direction of the adjusting cabin (63).

8. A point type photoelectric smoke fire detector for fire alarm according to claim 3, characterized in that: When the mounting lug plate (23) slides on the outer shell ring rail (21), the adjusting groove (22) always keeps in close contact with the outer surface of the outer shell ring rail (21), and the axis direction of the mounting hole (24) is perpendicular to the plane where the mounting lug plate (23) is located.

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