Smoke alarm and alarm method thereof

Abstract

The invention belongs to the technical field of fire fighting equipment, and particularly relates to a smoke alarm which comprises an alarm main body, a buckling groove is formed in the top of the alarm main body, and a mounting cavity is formed in the alarm main body; the bottom cover is arranged at the bottom of the alarm main body, and a smoke inlet hole is formed in the side wall of the bottom cover; the alarm mechanism comprises a control unit, a power supply and an alarm buzzer which are arranged in the mounting cavity; the smoke channel is arranged at the bottom of the alarm main body and is used for communicating the bottom cover and the mounting cavity; the sensing mechanism comprises a smoke sensor arranged in the mounting cavity and an infrared temperature sensor arranged at the bottom of the alarm main body; the protection mechanism is arranged on the smoke channel; wherein the smoke sensor and the infrared temperature sensor are both electrically connected with the control unit, compared with the prior art, the valve has the advantages that the situation of false alarm of the smoke alarm can be effectively reduced, and meanwhile, the service life of the smoke alarm is prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of fire fighting equipment, and in particular relates to a smoke alarm and an alarm method thereof. Background Art

[0002] A smoke alarm is a fire-fighting device that prevents fires by monitoring the concentration of smoke. It usually has a smoke sensor inside and is widely used in various fire alarm systems and important fire-fighting places such as homes, factories, office buildings, hospitals, schools, and museums. For example, a smoke alarm disclosed in patent application number CN201510502246.3 includes a base plate and a shell, the shell is fixedly arranged on the base plate, at least one first through hole is opened on the side wall of the shell, a control panel is arranged in the shell, the side edge of the control panel is fixedly arranged on the inner side of the shell, a second through hole is opened in the middle of the control panel, a control device, a wireless transmitter and an exhaust fan are fixedly arranged on the lower surface of the control panel, and a power supply, a transmission device, a smoke sensor and a cover are arranged in the upper chamber; This existing smoke alarm is easily invaded by dust during use, resulting in false alarms, and the internal structure is also easily contaminated by dust or insects, resulting in damage, so it is necessary to make improvements. Summary of the invention

[0003] The purpose of the present invention is to provide a smoke alarm and an alarm method thereof to reduce the occurrence of false alarms of the smoke alarm and to increase the service life of the smoke alarm. In view of this, the present invention provides a smoke alarm, comprising: An alarm body, wherein a buckling groove is arranged on the top of the alarm body, and a mounting cavity is arranged inside the alarm body; A bottom cover, the bottom cover is arranged at the bottom of the alarm body, and a smoke inlet hole is arranged on the side wall of the bottom cover; An alarm mechanism, the alarm mechanism comprising a control unit, a power supply and an alarm buzzer arranged in the mounting cavity; A smoke channel, which is arranged at the bottom of the alarm body and is used to connect the bottom cover and the installation cavity; Also includes: A sensing mechanism, the sensing mechanism comprising a smoke sensor disposed in the mounting cavity and an infrared temperature sensor disposed at the bottom of the alarm body; A protection mechanism, wherein the protection mechanism is arranged on the smoke passage; Wherein, the smoke sensor and the infrared temperature sensor are both electrically connected to the control unit.

[0004] In the present technical solution, through the joint action of the smoke sensor and the infrared temperature sensor, during the process of smoke alarm detecting smoke, the smoke alarm can effectively distinguish between the high-temperature smoke generated during a fire and the smoke generated by dust in the normal environment, thereby effectively reducing the false alarms of the smoke alarm. At the same time, through the setting of the protective mechanism, the components in the alarm body, such as the sensor mechanism, can be effectively protected, reducing the phenomenon of damage caused by dust or insect contamination of the internal structure of the alarm body, thereby increasing the service life of the smoke alarm.

[0005] In the above technical solution, further, the protection mechanism also includes: A protective shell, wherein a component cavity is disposed in the protective shell, vents are disposed on the bottom and top surfaces of the protective shell, and a baffle extending toward the interior of the protective shell is disposed on the vent; A plurality of longitudinal protection lines are evenly spaced and distributed in a lateral direction of the protection shell; A transverse protection line, wherein the transverse protection box has a plurality of transverse protection lines and is evenly spaced along the longitudinal direction of the protection shell; Among them, the plurality of transverse protection lines cooperate with the plurality of longitudinal protection lines to form a protection net.

[0006] In the above technical solution, further, the protection mechanism also includes: a partition plate, the partition plate being arranged in the component cavity and being located on the right side of the vent; An adjusting member, wherein the adjusting member has two members and is symmetrically distributed on both sides of the component cavity along the transverse direction of the protective shell; Among them, the two ends of the transverse protective line are respectively connected to the inner walls on both sides of the component cavity through a tensioning and winding piece, one end of the longitudinal protective line is connected to the side wall of the partition, and the other end is connected to the inner wall of the component cavity, and the adjusting piece can drive the transverse protective line to move longitudinally along the protective shell.

[0007] In the above technical solution, further, the adjusting member also includes: An adjusting motor, which is arranged in the component cavity and located on a side of the partition away from the longitudinal protection line; A rotating rod, the rotating rod comprising a first rotating rod and a second rotating rod, the first rotating rod and the second rotating rod are distributed at intervals along the transverse direction of the protective shell at the end of the transverse protection line, and the first rotating rod and the second rotating rod are both provided with a plurality of thread segments evenly distributed along the axial direction of the rotating rod; Moving blocks, the moving blocks comprising a plurality of first moving blocks arranged on the first rotating rod and a plurality of second moving blocks arranged on the second rotating rod, the top ends of the moving blocks being provided with wire holes for the lateral protection wires to pass through; A transmission gear set, the transmission gear set comprising a driving gear and a driven gear rotatably arranged on the side wall of the partition; Among them, the pitches of several thread segments increase in sequence, and the several thread segments on the first rotating rod and the several thread segments on the second rotating rod are staggered. The moving block is movably connected to the bottom surface of the component cavity, the first moving block is threadedly connected to the thread segment on the first rotating rod, and the second moving block is movably connected to the thread segment on the second rotating rod. The driving gear is transmission-connected to the driving end of the adjusting motor, and the driven gear is transmission-connected to the driving gear. The driving gear and the driven gear are transmission-connected to the first rotating rod and the second rotating rod respectively, and the adjusting motor is controlled by a control unit.

[0008] In the above technical solution, further, it also includes: A striking cleaning piece is arranged in the component cavity and is used for cleaning dust attached to the longitudinal protection line and the transverse protection line by striking.

[0009] In the above technical solution, further, the striking and cleaning member also includes: A half gear set, the half gear set comprising a driving half gear and a driven half gear rotatably arranged on a side wall of the partition away from the regulating motor; A connecting arm, the connecting arm being arranged on the toothless side of the driven half gear, and a striking rod being arranged at one end of the connecting arm away from the driven half gear; A one-way transmission gear, which is rotatably arranged on a side wall of the partition away from the half gear set and is transmission-connected to the driving half gear; The axial direction of the striking rod is parallel to the longitudinal direction of the protective shell, the one-way transmission gear is connected to the driven gear through a plurality of intermediate gears, the top circle of the first meshing tooth of the driving half gear and the driven half gear is larger than the top circle of the other meshing teeth of the driving half gear, and the top circle of the second meshing tooth of the driven half gear and the driving half gear is larger than the top circle of the other meshing teeth of the driven half gear.

[0010] In the above technical solution, further, the tensioning and winding member also includes: An outer shell, wherein an elastic tensioning wheel is rotatably arranged inside the outer shell, and a protective wire outlet is arranged on a side wall of the outer shell; A braking part, which is arranged on the top of the outer shell and is transmission-connected to the elastic tensioning wheel; Wherein, the braking part can limit the rotation of the elastic tensioning wheel when the transverse protection line is hit.

[0011] In the above technical solution, further, the braking part also includes: A brake housing, wherein the brake housing is arranged on the top of the outer shell, and a brake friction layer is arranged on the inner wall of the brake housing; A connecting shaft, the connecting shaft is rotatably arranged in the brake housing, and the connecting shaft is transmission-connected to the elastic tensioning wheel; The arm shafts have four arms and are symmetrically arranged in pairs on both sides of the connecting shaft, and the arm shafts are radially distributed along the connecting shaft; A movable block, wherein the movable block has two movable blocks and is symmetrically distributed on both sides of the connecting shaft, and the movable block is movably connected to the two arm shafts on one side of the connecting shaft and can move along the axial direction of the arm shaft; A preload spring, wherein the preload spring is sleeved on the arm shaft, one end of the preload spring is connected to the connecting shaft, and the other end is connected to the movable block; Wherein, the outer surface of the movable block is provided with a friction surface which cooperates with the braking friction layer.

[0012] In the above technical solution, further, the present invention also discloses a method for using the above smoke alarm, comprising the following steps: S1 Smoke detection: When smoke appears in the environment where the smoke alarm is installed, the smoke spreads to the bottom cover and eventually enters the alarm body through the smoke channel. The smoke sensor senses the smoke and sends a signal to the control unit. At the same time, the infrared temperature sensor detects the temperature of the smoke. S2 Smoke judgment: when the smoke sensor detects smoke and the infrared temperature sensor detects that the smoke is high-temperature smoke, the control unit controls the alarm buzzer to sound an alarm; when the smoke sensor detects smoke and the infrared temperature sensor detects that the smoke is normal-temperature smoke, the control unit does not control the alarm buzzer; S3 protection: when the smoke sensor detects smoke and the infrared temperature sensor detects that the smoke is at room temperature, the control unit controls the protection mechanism to work, the spacing between the horizontal protection lines is reduced, and the protection density of the protection net is increased, preventing dust and smoke from entering the alarm body; S4 reset: after a period of time after the protection is started in S3, the control unit controls the protection mechanism to reset to reduce the protection density of the protection net.

[0013] In the present technical solution, the smoke alarm adopts the above method to effectively distinguish the high-temperature smoke generated by fire and the smoke generated by dust in the normal environment, thereby effectively reducing the false alarm of the smoke alarm. At the same time, it can effectively protect the inside of the alarm body when dust and smoke spread. At the same time, it can also effectively prevent insects from entering the inside of the alarm body in daily use, effectively increasing the service life of the smoke alarm.

[0014] The beneficial effects of the present invention are: 1. Through the combined action of smoke sensors and infrared temperature sensors, smoke alarms can effectively distinguish between high-temperature smoke generated during fires and smoke generated by dust in normal environments, thereby effectively reducing false alarms of smoke alarms; 2. The protection mechanism can effectively protect the interior of the alarm body, and can also effectively prevent insects from entering the alarm body in daily use, effectively extending the service life of the smoke alarm; 3. The setting of the striking cleaning part and the braking part can effectively clean the dust attached to the horizontal protection line and the longitudinal protection line, ensuring the cleaning of the protection net, thereby ensuring that the smoke generated by the fire can smoothly spread to the alarm body. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.

[0016] Figure 1 It is a schematic structural diagram of a specific implementation method of the present invention.

[0017] Figure 2 It is a schematic diagram of the main view structure of the present invention.

[0018] Figure 3 It is a schematic diagram of the cross-sectional structure of the present invention.

[0019] Figure 4 It is a bottom view structural schematic diagram of the protection mechanism of the present invention.

[0020] Figure 5 It is a schematic diagram of the internal structure of the component cavity of the present invention.

[0021] Figure 6 It is a schematic diagram of the structure of the protection mechanism of the present invention.

[0022] Figure 7 It is a schematic diagram of the structure of the striking cleaning piece of the present invention.

[0023] Figure 8 It is a schematic diagram of the structure of the tensioning and winding member of the present invention.

[0024] Fig. 9 It is a schematic diagram of the structure of the movable block of the present invention.

[0025] The symbols in the figure are: 1. Alarm body; 1000, snap-fit ​​groove; 1001, installation cavity; 2, bottom cover; 200, smoke inlet; 3, alarm mechanism; 30, control unit; 31, power supply; 32, alarm buzzer; 4, smoke channel; 5, smoke sensor; 6, infrared temperature sensor; 7, protection mechanism; 70, protection shell; 71, component cavity; 72, vent; 73, enclosure; 74, longitudinal protection line; 75, transverse protection line; 76, partition; 8, adjustment member; 80, adjustment motor; 81, first rotating rod; 82, second rotating rod; 83, first shift Moving block; 84, second moving block; 85, wire hole; 86, driving gear; 87, driven gear; 9, tensioning and winding member; 90, outer shell; 91, elastic tensioning wheel; 92, protective wire outlet; 93, braking part; 930, braking shell; 931, braking friction layer; 932, connecting shaft; 933, arm shaft; 934, movable block; 935, preload spring; 10, striking cleaning member; 100, driving half gear; 101, driven half gear; 102, connecting arm; 103, striking rod; 104, one-way transmission gear; 105, intermediate gear. DETAILED DESCRIPTION

[0026] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] In the description of the present application, it should be noted that the terms used herein are only for describing specific embodiments, and are not intended to limit the exemplary embodiments according to the present application. For ease of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship. The technology, methods and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, methods and equipment should be regarded as part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as merely exemplary, rather than as a limitation. Therefore, other examples of the exemplary embodiments may have different values. It should be noted that similar numbers and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further discussed in subsequent drawings.

[0028] The embodiment of the present application provides a smoke alarm, comprising: an alarm body 1, a buckle groove 1000 is provided on the top of the alarm body 1, and a mounting cavity 1001 is provided in the alarm body 1; a bottom cover 2, the bottom cover 2 is provided at the bottom of the alarm body 1, and a smoke inlet 200 is provided on the side wall of the bottom cover 2; an alarm mechanism 3, the alarm mechanism 3 includes a control unit 30, a power supply 31 and an alarm buzzer 32 provided in the mounting cavity 1001; a smoke channel 4, the smoke channel 4 is provided at the bottom of the alarm body 1 for connecting the bottom cover 2 with the mounting cavity 1001; The device further comprises: a sensing mechanism, the sensing mechanism comprising a smoke sensor 5 arranged in the installation cavity 1001 and an infrared temperature sensor 6 arranged at the bottom of the alarm body 1; a protection mechanism 7, the protection mechanism 7 is arranged on the smoke channel 4; The smoke sensor 5 and the infrared temperature sensor 6 are both electrically connected to the control unit 30 .

[0029] Moreover, the alarm body 1 and the bottom cover 2 are both conventional structures, there are a plurality of smoke inlet holes 200 and they are evenly spaced along the circumference of the bottom cover 2, the smoke channel 4 runs through the installation cavity 1001 to the bottom cover 2, and the alarm mechanism 3 is a conventional structure.

[0030] In the present technical solution, through the joint action of the smoke sensor 5 and the infrared temperature sensor 6, during the process of smoke detection by the smoke alarm, the smoke alarm can effectively distinguish between the high-temperature smoke generated during a fire and the smoke generated by dust in the normal environment, thereby effectively reducing the false alarms of the smoke alarm. At the same time, through the provision of the protective mechanism 7, the components in the alarm body 1, such as the sensor mechanism, can be effectively protected, reducing the phenomenon of damage to the internal structure of the alarm body 1 due to contamination by dust or insects, thereby increasing the service life of the smoke alarm.

[0031] This embodiment provides a smoke alarm, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the protection mechanism 7 also includes: a protection shell 70, a component cavity 71 is provided in the protection shell 70, a vent 72 is provided on the bottom and top surfaces of the protection shell 70, and a fence 73 extending to the inside of the protection shell 70 is provided on the vent 72; a longitudinal protection line 74, the longitudinal protection line 74 has a plurality of longitudinal protection lines and is evenly spaced along the transverse direction of the protection shell 70; a transverse protection line 75, the transverse protection box has a plurality of transverse protection lines and is evenly spaced along the longitudinal direction of the protection shell 70; Among them, a plurality of transverse protection lines 75 and a plurality of longitudinal protection lines 74 cooperate to form a protection net.

[0032] The protection mechanism 7 further includes: a partition 76, which is disposed in the component cavity 71 and is located on the right side of the vent 72; an adjustment member 8, which has two adjustment members and is symmetrically distributed on both sides of the component cavity 71 along the protective housing 70; Among them, the two ends of the transverse protective line 75 are respectively connected to the inner walls on both sides of the component cavity 71 through the tensioning and winding member 9, one end of the longitudinal protective line 74 is connected to the side wall of the partition 76, and the other end is connected to the inner wall of the component cavity 71, and the adjusting member 8 can drive the transverse protective line 75 to move longitudinally along the protective shell 70.

[0033] The adjusting member 8 further includes: an adjusting motor 80, which is arranged in the component cavity 71 and is located on the side of the partition 76 away from the longitudinal protection line 74; a rotating rod, which includes a first rotating rod 81 and a second rotating rod 82, which are distributed at the end of the transverse protection line 75 at intervals along the transverse direction of the protection shell 70, and the first rotating rod 81 and the second rotating rod 82 are both provided with a plurality of threaded sections evenly spaced along the axial direction of the rotating rod; a moving block, which includes a plurality of first moving blocks 83 arranged on the first rotating rod 81 and a plurality of second moving blocks 84 arranged on the second rotating rod 82, and a wire hole 85 for the transverse protection line 75 to pass through is provided at the top of the moving block; a transmission gear set, which includes a driving gear 86 and a driven gear 87 rotatably arranged on the side wall of the partition 76; Among them, the pitches of several thread segments increase successively, several thread segments on the first rotating rod 81 and several thread segments on the second rotating rod 82 are staggered, the moving block is movably connected to the bottom surface of the component cavity 71, the first moving block 83 is threadedly connected to the thread segment on the first rotating rod 81, the second moving block 84 is movably connected to the thread segment on the second rotating rod 82, the driving gear 86 is transmission-connected to the driving end of the adjusting motor 80, the driven gear 87 is transmission-connected to the driving gear 86, the driving gear 86 and the driven gear 87 are transmission-connected to the first rotating rod 81 and the second rotating rod 82 respectively, and the adjusting motor 80 is controlled by the control unit 30.

[0034] Moreover, the vent 72 passes through the component cavity 71, the enclosure 73 is a conventional enclosure 73, and the enclosure 73 can extend to the plane where the longitudinal protective line 74 and the transverse protective line 75 are located. The adjustment motor 80 is a conventional micro motor, and the transverse protective line 75 can be woven with the longitudinal protective line 74, or placed above the longitudinal protective line 74. The moving block is movably connected to the bottom surface of the component cavity 71 in a conventional manner, such as through a guide rail slider or a slide groove slider. The thread rotation direction of the threaded segments on the first rotating rod 81 and the second rotating rod 82 can be selected according to the structure of the transmission gear set, such as selecting opposite rotation directions or the same rotation directions.

[0035] In this embodiment, when the protection mechanism 7 is in use, the protection net formed by the horizontal protection line 75 and the longitudinal protection line 74 under normal conditions can effectively prevent insects from entering the alarm body 1, and can block large impurities floating in the air, effectively protecting the components in the alarm body 1. When dust and smoke pollution occurs, the control unit 30 controls the adjustment motor 80 to operate, and the adjustment motor 80 rotates to drive the driving gear 86 to rotate, and the driven gear 87 rotates accordingly. The first rotating rod 81 and the second rotating rod 82 rotate with the rotation of the driving gear 86 and the driven gear 87 respectively. During the rotation of the first rotating rod 81 and the second rotating rod 82, the first moving block 83 and the second moving block 83 rotate. Under the action of the threaded segment, block 84 converts rotational motion into linear motion, so that the first moving block 83 and the second moving block 84 move axially along the first rotating rod 81 and the second rotating rod 82 respectively, and because the pitch of the threaded segment increases successively, as the first moving block 83 and the second moving block 84 move, the wire hole 85 will drive the transverse protective wire 75 to approach each other, thereby making the aperture of the protective net smaller and improving the protective density of the protective net. After the protective density of the protective net is improved, it can effectively prevent dust in the dust and smoke from entering the alarm body 1, reduce the phenomenon of damage caused by dust pollution to the internal structure of the alarm body 1, and improve the service life of the smoke alarm.

[0036] This embodiment provides a smoke alarm, which, in addition to the technical solutions of the above-mentioned embodiments, also has the following technical features, including: a striking cleaning piece 10, which is arranged in the component cavity 71 and is used to clean dust attached to the longitudinal protective line 74 and the transverse protective line 75 by striking.

[0037] The striking cleaning member 10 further includes: a half gear set, the half gear set includes a driving half gear 100 and a driven half gear 101 rotatably arranged on the side wall of the partition 76 away from the regulating motor 80; a connecting arm 102, the connecting arm 102 is arranged on the toothless side of the driven half gear 101, and a striking rod 103 is arranged on the end of the connecting arm 102 away from the driven half gear 101; a one-way transmission gear 104, the one-way transmission gear 104 is rotatably arranged on the side wall of the partition 76 away from the half gear set and is transmission-connected to the driving half gear 100; Among them, the axial direction of the striking rod 103 is parallel to the longitudinal direction of the protective shell 70, the one-way transmission gear 104 is connected to the driven gear 87 through a plurality of intermediate gears 105, the tooth top circle of the first meshing tooth of the driving half gear 100 and the driven half gear 101 is larger than the tooth top circle of the other meshing teeth of the driving half gear 100, and the tooth top circle of the second meshing tooth of the driven half gear 101 and the driving half gear 100 is larger than the tooth top circle of the other meshing teeth of the driven half gear 101.

[0038] Furthermore, a conventional torsion spring may be installed on the driven half gear 101 to improve the resetting effect of the driven half gear 101 .

[0039] In this embodiment, during the resetting process of the protection mechanism 7, the control unit 30 controls the adjustment motor 80 to operate, the adjustment motor 80 rotates to drive the driving gear 86 to rotate, and the driven gear 87 rotates accordingly, and the first rotating rod 81 and the second rotating rod 82 rotate with the rotation of the driving gear 86 and the driven gear 87 respectively. During the rotation of the first rotating rod 81 and the second rotating rod 82, the first moving block 83 and the second moving block 84 convert the rotational motion into a linear motion under the action of the threaded segment, so that the first moving block 83 and the second moving block 84 respectively move along the first rotating rod 81 and the second rotating rod 82. Axial movement, with the movement of the first moving block 83 and the second moving block 84, the transverse protection line 75 is gradually reset. At the same time, with the rotation of the driven gear 87, the one-way transmission gear 104 is driven by a plurality of intermediate gears 105 to rotate, thereby driving the driving half gear 100 to rotate, and the driving half gear 100 rotates to drive the driven half gear 101 to rotate. During the rotation of the driven half gear 101, the connecting arm 102 is lifted upward, thereby lifting the striking rod 103. When the driving half gear 100 rotates to the half portion without meshing teeth, the driving half gear 100 and the driven half gear 101 are engaged with each other. The engagement is released, and the connecting arm 102 falls downward under the action of gravity, thereby driving the striking rod 103 to strike the transverse protection line 75. After the transverse protection line 75 is struck, it drives the longitudinal protection line 74 to vibrate together. The setting of the torsion spring can further increase the striking force of the striking rod 103 on the transverse protection line 75 through elastic force. As the transverse protection line 75 is continuously reset, the striking rod 103 repeatedly strikes the transverse protection line 75, thereby effectively cleaning the dust attached to the transverse protection line 75 and the longitudinal protection line 74, so that after the protection mechanism 7 is reset, the protection net will not be horizontally The dust attached to the protective line 75 and the longitudinal protective line 74 is blocked to ensure that the smoke can spread normally to the alarm body 1. At the same time, the top circle of the first meshing tooth that meshes with the driving half gear 100 and the driven half gear 101 is larger than the top circle of the other meshing teeth of the driving half gear 100, and the top circle of the second meshing tooth that meshes with the driven half gear 101 and the driving half gear 100 is larger than the top circle of the other meshing teeth of the driven half gear 101, so that the driving half gear 100 and the driven half gear 101 will not get stuck when they start to mesh, thereby improving the working stability of the striking cleaning piece 10.

[0040] This embodiment provides a smoke alarm, which, in addition to the technical solutions of the above embodiments, also has the following technical features: the tensioning and winding member 9 also includes: an outer shell 90, in which an elastic tensioning wheel 91 is rotatably arranged, and a protective wire outlet 92 is arranged on the side wall of the outer shell 90; a braking part 93, which is arranged on the top of the outer shell 90 and is transmission-connected to the elastic tensioning wheel 91; The braking portion 93 can limit the rotation of the elastic tensioning wheel 91 when the transverse protection line 75 is hit.

[0041] The brake part 93 also includes: a brake housing 930, which is arranged on the top of the outer shell 90, and a brake friction layer 931 is arranged on the inner wall of the brake housing 930; a connecting shaft 932, which is rotatably arranged in the brake housing 930, and the connecting shaft 932 is transmission-connected with the elastic tensioning wheel 91; an arm shaft 933, which has four arm shafts 933 and is symmetrically arranged on both sides of the connecting shaft 932 in pairs, and the arm shafts 933 are radially distributed along the connecting shaft 932; a movable block 934, which has two and is symmetrically distributed on both sides of the connecting shaft 932, and the movable block 934 is movably connected to the two arm shafts 933 on one side of the connecting shaft 932 and can move axially along the arm shaft 933; a pre-tightening spring 935, which is sleeved on the arm shaft 933, and one end of the pre-tightening spring 935 is connected to the connecting shaft 932, and the other end is connected to the movable block 934; The outer surface of the movable block 934 is provided with a friction surface that cooperates with the braking friction layer 931 .

[0042] In this embodiment, when the striking rod 103 strikes the transverse protection line 75, the transverse protection line 75 is subjected to a great force in an instant and drives the elastic tensioning wheel 91 to rotate rapidly, the connecting shaft 932 rotates rapidly along with the elastic tensioning wheel 91, and the arm shaft 933 rotates along with the rotation of the connecting shaft 932. At this time, the movable block 934 on the arm shaft 933 is subjected to centrifugal force, and the movable block 934 overcomes the elastic force of the preload spring 935 and moves to the outside of the arm shaft 933. Finally, the friction surface on the movable block 934 and the friction surface on the movable block 934 are The friction layer abuts against each other, and the friction surface and the friction layer cooperate to brake the elastic tensioning wheel 91 through friction force, thereby tightening the transverse protective line 75, improving the striking effect of the striking rod 103 on the protective net, thereby improving the cleaning effect of the striking cleaning mechanism on the dust attached to the protective net. When adjusting the transverse protective line 75, due to the slow rotation speed of the elastic tensioning wheel 91, the centrifugal force exerted on the movable block 934 cannot overcome the elastic force of the pre-tightening spring 935, thereby ensuring that the transverse protective line 75 can be pulled out smoothly.

[0043] This embodiment provides a method for using a smoke alarm, which, in addition to the technical solutions of the above embodiments, also has the following technical features, including the following steps: S1 Smoke detection: when smoke appears in the environment where the smoke alarm is installed, the smoke spreads to the bottom cover 2 and finally enters the alarm body 1 through the smoke channel 4. The smoke sensor 5 senses the smoke and sends a signal to the control unit 30. At the same time, the infrared temperature sensor 6 detects the temperature of the smoke. S2 smoke judgment, when the smoke sensor 5 detects smoke and the infrared temperature sensor 6 detects that the smoke is high temperature smoke, the control unit 30 controls the alarm buzzer 32 to sound an alarm, when the smoke sensor 5 detects smoke and the infrared temperature sensor 6 detects that the smoke is normal temperature smoke, the control unit 30 does not control the alarm buzzer 32; S3 protection, when the smoke sensor 5 detects smoke and the infrared temperature sensor 6 detects that the smoke is at room temperature, the control unit 30 controls the protection mechanism 7 to work, the spacing between the transverse protection lines 75 is reduced, so that the protection density of the protection net is increased, and dust and smoke are blocked from entering the alarm body 1; S4 Reset: After a period of time after the protection is started in S3, the control unit 30 controls the protection mechanism 7 to reset to reduce the protection density of the protection net.

[0044] In this embodiment, the smoke alarm uses the above method to effectively distinguish the high-temperature smoke generated during a fire and the smoke generated by dust in the normal environment, thereby effectively reducing the false alarms of the smoke alarm. At the same time, when dust and smoke spread, the inside of the alarm body 1 can be effectively protected. At the same time, in daily use, it can also effectively prevent insects from entering the inside of the alarm body 1, effectively improving the service life of the smoke alarm.

[0045] The embodiments of the present application are described above in conjunction with the accompanying drawings. In the absence of conflict, the embodiments in the present application and the features in the embodiments can be combined with each other. The present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A smoke alarm, comprising: An alarm body (1), wherein a buckling groove (1000) is provided at the top of the alarm body (1), and a mounting cavity (1001) is provided inside the alarm body (1); A bottom cover (2), the bottom cover (2) being arranged at the bottom of the alarm body (1), and a smoke inlet hole (200) being arranged on a side wall of the bottom cover (2); An alarm mechanism (3), the alarm mechanism (3) comprising a control unit (30), a power source (31), and an alarm buzzer (32) arranged in the mounting cavity (1001); A smoke passage (4), the smoke passage (4) being arranged at the bottom of the alarm body (1) and being used for connecting the bottom cover (2) and the installation cavity (1001); It is characterized by further comprising: A sensing mechanism, the sensing mechanism comprising a smoke sensor (5) arranged in the mounting cavity (1001) and an infrared temperature sensor (6) arranged at the bottom of the alarm body (1); A protection mechanism (7), wherein the protection mechanism (7) is arranged on the smoke passage (4); Wherein, the smoke sensor (5) and the infrared temperature sensor (6) are both electrically connected to the control unit (30).

2. A smoke alarm according to claim 1, characterized in that: The protection mechanism (7) further comprises: A protective shell (70), wherein a component cavity (71) is provided in the protective shell (70), a vent (72) is provided on the bottom surface and the top surface of the protective shell (70), and a baffle (73) extending toward the inside of the protective shell (70) is provided on the vent (72); A plurality of longitudinal protective lines (74) are provided and are evenly spaced apart in the transverse direction of the protective shell (70); A transverse protection line (75), the transverse protection box having a plurality of transverse protection lines and being evenly spaced and distributed along the longitudinal direction of the protection shell (70); The plurality of transverse protection lines (75) cooperate with the plurality of longitudinal protection lines (74) to form a protection net.

3. A smoke alarm according to claim 2, characterized in that: The protection mechanism (7) further comprises: a partition plate (76), the partition plate (76) being arranged in the component cavity (71) and located on the right side of the vent (72); An adjusting member (8), wherein the adjusting members (8) have two and are symmetrically distributed on both sides of the component cavity (71) along the transverse direction of the protective shell (70); The two ends of the transverse protection line (75) are respectively connected to the inner walls on both sides of the component cavity (71) through a tensioning and winding member (9); one end of the longitudinal protection line (74) is connected to the side wall of the partition (76) and the other end is connected to the inner wall of the component cavity (71); and the adjusting member (8) can drive the transverse protection line (75) to move longitudinally along the protective housing (70).

4. A smoke alarm according to claim 3, characterized in that: The adjusting member (8) further comprises: An adjusting motor (80), the adjusting motor (80) being arranged in the component cavity (71) and located on a side of the partition (76) away from the longitudinal protection line (74); A rotating rod, the rotating rod comprising a first rotating rod (81) and a second rotating rod (82), the first rotating rod (81) and the second rotating rod (82) being distributed at intervals along the transverse direction of the protective shell (70) at the end of the transverse protective line (75), and the first rotating rod (81) and the second rotating rod (82) being provided with a plurality of threaded sections evenly distributed along the axial direction of the rotating rod; Moving blocks, the moving blocks comprising a plurality of first moving blocks (83) arranged on the first rotating rod (81) and a plurality of second moving blocks (84) arranged on the second rotating rod (82), the top ends of the moving blocks being provided with wire holes (85) for the transverse protection wires (75) to pass through; A transmission gear set, the transmission gear set comprising a driving gear (86) and a driven gear (87) rotatably disposed on a side wall of the partition plate (76); The pitches of the plurality of thread segments are increased in sequence, the plurality of thread segments on the first rotating rod (81) and the plurality of thread segments on the second rotating rod (82) are arranged alternately, the moving block is movably connected to the bottom surface of the component cavity (71), the first moving block (83) is threadedly connected to the thread segment on the first rotating rod (81), the second moving block (84) is movably connected to the thread segment on the second rotating rod (82), the driving gear (86) is drivingly connected to the driving end of the adjustment motor (80), the driven gear (87) is drivingly connected to the driving gear (86), the driving gear (86) and the driven gear (87) are drivingly connected to the first rotating rod (81) and the second rotating rod (82) respectively, and the adjustment motor (80) is controlled by a control unit (30).

5. A smoke alarm according to claim 4, characterized in that: Also includes: A striking cleaning piece (10) is arranged in the component cavity (71) and is used for cleaning dust attached to the longitudinal protection line (74) and the transverse protection line (75) by striking.

6. A smoke alarm according to claim 5, characterized in that: The striking and cleaning member (10) further comprises: A half gear set, the half gear set comprising a driving half gear (100) and a driven half gear (101) rotatably arranged on a side wall of the partition (76) away from the regulating motor (80); A connecting arm (102), the connecting arm (102) being arranged on the toothless side of the driven half gear (101), and a striking rod (103) being arranged at one end of the connecting arm (102) away from the driven half gear (101); a one-way transmission gear (104), the one-way transmission gear (104) being rotatably disposed on a side wall of the partition (76) away from the half gear set and being transmission-connected to the driving half gear (100); The axial direction of the striking rod (103) is parallel to the longitudinal direction of the protective shell (70); the one-way transmission gear (104) is transmission-connected to the driven gear (87) via a plurality of intermediate gears (105); the tooth top circle of the first meshing tooth of the driving half gear (100) and the driven half gear (101) is larger than the tooth top circles of the other meshing teeth of the driving half gear (100); and the tooth top circle of the second meshing tooth of the driven half gear (101) and the driving half gear (100) is larger than the tooth top circles of the other meshing teeth of the driven half gear (101).

7. A smoke alarm according to claim 6, characterized in that: The tensioning and winding member (9) further comprises: An outer shell (90), wherein an elastic tensioning wheel (91) is rotatably arranged inside the outer shell (90), and a protective wire guide outlet (92) is arranged on a side wall of the outer shell (90); A braking portion (93), the braking portion (93) being arranged on the top of the outer shell (90) and being transmission-connected to the elastic tensioning wheel (91); The braking portion (93) can limit the rotation of the elastic tensioning wheel (91) when the transverse protection line (75) is hit.

8. A smoke alarm according to claim 7, characterized in that: The braking portion (93) further comprises: A brake housing (930), the brake housing (930) being arranged on the top of the outer shell (90), and a brake friction layer (931) being arranged on the inner wall of the brake housing (930); A connecting shaft (932), the connecting shaft (932) being rotatably disposed in the brake housing (930), the connecting shaft (932) being transmission-connected to the elastic tensioning wheel (91); Arm shafts (933), the arm shafts (933) having four arms and symmetrically arranged in pairs on both sides of the connecting shaft (932), the arm shafts (933) being radially distributed along the connecting shaft (932); A movable block (934), the movable block (934) having two portions symmetrically distributed on both sides of the connecting shaft (932), the movable block (934) being movably connected to two arm shafts (933) on one side of the connecting shaft (932) and being movable along the axial direction of the arm shaft (933); A preload spring (935), wherein the preload spring (935) is sleeved on the arm shaft (933), one end of the preload spring (935) is connected to the connecting shaft (932), and the other end is connected to the movable block (934); The outer surface of the movable block (934) is provided with a friction surface that cooperates with the braking friction layer (931).

9. An alarm method applicable to the smoke alarm according to claim 8, characterized in that: The following steps are involved: S1 smoke detection, when smoke appears in the environment where the smoke alarm is installed, the smoke spreads to the bottom cover (2) and eventually enters the alarm body (1) through the smoke passage (4), the smoke sensor (5) senses the smoke and sends a signal to the control unit (30), while the infrared temperature sensor (6) detects the temperature of the smoke; S2 smoke judgment, when the smoke sensor (5) detects smoke and the infrared temperature sensor (6) detects that the smoke is high-temperature smoke, the control unit (30) controls the alarm buzzer (32) to sound an alarm, and when the smoke sensor (5) detects smoke and the infrared temperature sensor (6) detects that the smoke is normal-temperature smoke, the control unit (30) does not control the alarm buzzer (32); S3 protection, when the smoke sensor (5) detects smoke and the infrared temperature sensor (6) detects that the smoke is normal temperature smoke, the control unit (30) controls the protection mechanism (7) to work, the spacing between the horizontal protection lines (75) is reduced, so that the protection density of the protection net is increased, and dust and smoke are blocked from entering the alarm body (1); S4: Reset. After a period of time after the protection is started in S3, the control unit (30) controls the protection mechanism (7) to reset so as to reduce the protection density of the protection net.

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