CN107093307B

CN107093307B - Miniature smoke alarm

Info

Publication number: CN107093307B
Application number: CN201710448935.XA
Authority: CN
Inventors: 刘允彪
Original assignee: Suzhou Primetech Electronics Co ltd
Current assignee: Suzhou Primetech Electronics Co ltd
Priority date: 2017-06-14
Filing date: 2017-06-14
Publication date: 2020-10-09
Anticipated expiration: 2037-06-14
Also published as: CN107093307A; EP3640904A1; WO2018227897A1; EP3640904A4; EP3640904B1

Abstract

The invention provides a miniature smoke alarm, which comprises a base and a cover body moving along the axial direction of the base, wherein a smoke inlet hole for smoke to enter a detection part is formed in the side wall of the cover body, an elastic part for driving the cover body to be far away from the base through elastic action is arranged between the cover body and the base, a limiting part for limiting the cover body to be separated from the base through abutting action is arranged between the cover body and the base, a first button which is triggered through the movement of the cover body towards the base is arranged on one surface of a control circuit board, which faces towards the base, the first button controls the test and stop of the smoke alarm, and the detection part and a sound generation part are electrically connected with a power supply in the base. The user accessible this kind of mode stops smoke alarm to cry and test smoke alarm, and the smoke alarm that this kind of mode set up is less, and adopts the mode that the lid triggered, and the area of lid has accounted for more than 90% of base orthographic projection area, and the person of facilitating the use stops smoke alarm to cry and test smoke alarm.

Description

Miniature smoke alarm

Technical Field

The invention relates to a smoke alarm, in particular to a miniature smoke alarm.

Background

The smoke alarm is based on the principle that when smoke is detected through an alarm unit in the smoke alarm, a buzzing sheet in the smoke detector can make a sound, so that a user is warned.

One of the major problems with smoke detectors in this field is the bulkiness of the smoke alarm. In order to obtain a reliable and inexpensive construction, the smoke detection chamber in the prior art smoke alarms is made larger. Therefore, known smoke alarms are undesirable in most homes due to their relatively bulky size, and their design is therefore seldom added to home furnishing solutions.

In the prior art, the invention patent with application publication number "CN 102754136A" discloses a smoke alarm, which is designed into a small-sized smoke alarm by changing the wing structure of a detection device to adjust the size of a smoke detection chamber, but the button (see the reference numeral 21 in fig. 6 in the invention patent) of the smoke alarm is arranged on the side surface of a shell, the small-sized smoke alarm is arranged on a ceiling 3 meters away from the ground, and the small button needs to be pressed from the side surface when the smoke alarm is stopped or tested, which is very inconvenient to use.

Disclosure of Invention

The invention aims to provide a miniature smoke alarm which is convenient for a user to stop the sounding of the smoke alarm and test the smoke alarm.

The technical purpose of the invention is realized by the following technical scheme: the utility model provides a miniature smoke alarm, includes base and the lid along base axial displacement, be provided with the detection part that is used for detecting smog concentration in the lid, be used for producing the control circuit board of the portion of making a sound, control detection portion and the portion of making a sound of sound wave, the lateral wall of lid is provided with the cigarette inlet hole that supplies the smog to get into the detection part, be provided with the elastic component who keeps away from the base through elastic action drive lid between lid and the base, be provided with the spacing portion that breaks away from the base through butt effect restriction lid between lid and the base, control circuit board is provided with the first button that is triggered through the lid to the removal of base direction in the one side of base, the test and the stopping of first button control smoke alarm, detection portion and the portion of making a sound are connected with the power electricity in the base.

By adopting the technical scheme, when the miniature smoke alarm is installed at the top of the interior of a house, a user presses the cover body at the top, the cover body moves towards the base, the first button on the control circuit board is triggered by the base, and the user can stop the smoke alarm from sounding and test the smoke alarm in the mode; after being pressed, the cover body is far away from the position triggering the first button through the elastic part between the base and the cover body.

Preferably, the base comprises a mounting plate and a tubular part connected to the mounting plate, a partition plate is arranged at the bottom of the tubular part, a battery cavity for placing a battery is formed in the partition plate in a concave mode along the axial direction of the tubular part, and an opening for moving the cover body is formed in the top of the tubular part.

By adopting the technical scheme, the battery is arranged in the base through the battery cavity formed by the partition plate, so that the occupied space is saved; the tubular part serves two functions: firstly, the height of the tubular part is a position for placing a battery, and the battery is larger because the service life of the smoke alarm needs to be met for 5-10 years, so that the size of the miniature smoke alarm is limited to a certain extent; secondly, the cover body is installed on the tubular part through the opening, and the height of the tubular part needs to meet the downward stroke of the cover body at the same time.

Preferably, the elastic portion includes a molding hole provided on an outer side wall of the battery cavity and an elastic piece extending in a direction inclined to the opening along a side wall of the molding hole.

Through adopting above-mentioned technical scheme, the flexure strip that the slope set up to the opening direction through the elastic restoring force of self, has played the effect that resets the lid, and the flexure strip is formed by the lateral wall in shaping hole simultaneously, has reduced the stress concentration problem between flexure strip and the battery chamber lateral wall, and the shaping hole makes things convenient for the flexure strip to carry out the drawing die simultaneously, has also reduced the degree of difficulty of moulding plastics.

Preferably, the at least two forming holes are arranged in the radial direction of the tubular part, and the projections of the adjacent elastic sheets in the vertical direction are staggered.

Through adopting above-mentioned technical scheme, the elastic sheet of crisscross setting has played balanced outside effect of supporting and pushing to control circuit board through elastic deformation, avoids single-point atress too big on the control circuit board.

Preferably, the limiting part comprises a first limiting block arranged on the cover body and a second limiting block arranged on the inner wall of the tubular part and positioned in the moving direction of the first limiting block.

By adopting the technical scheme, in the installation process, the first limiting block and the second limiting block enable the cover body to be connected with the tubular part together through the deformation in the horizontal direction; in the use, when the lid outwards removed because the effect of elasticity portion, first stopper and second stopper took place the butt in the axial of lid, prevent that lid and tubular portion from taking place to break away from.

Preferably, a switch button for controlling the power supply to be turned on and off is arranged between the base and the tubular part.

Through adopting above-mentioned technical scheme, shift knob control power starts, avoids smoke alarm in the transportation or stores the in-process, and extravagant electric energy reduces smoke alarm's life-span then, avoids smoke alarm to produce the mistake simultaneously and rings.

As preferred, the baffle is sunken to the opening direction along the axial and is formed the recess, the recess extends along the circumference of tubulose and forms the limiting plate, form between the bottom surface of limiting plate and the bottom surface of recess and keep off the position groove, be provided with the stopper that can slide in and keep off the position inslot on the mounting panel, the lateral wall of recess is provided with first locating piece, the lateral wall of stopper be provided with first locating piece cooperation restriction baffle pivoted first locating groove.

By adopting the technical scheme, the mounting plate and the tubular part of the miniature smoke alarm are fixed, the separation of the tubular part and the mounting plate is limited by the abutting action after the limiting block is rotated into the blocking groove in the axial direction of the tubular part, and the separation of the tubular part and the mounting plate can be generated when the limiting block is rotated out; in the rotation direction of tubulose portion, after mounting panel and tubulose portion take place relative rotation, first locating block card goes into first constant head tank, and the relative rotation of mounting panel and tubulose portion has been restricted to the deformation power between first locating block and the first constant head tank.

Preferably, a second positioning block axially extends from the bottom of the mounting plate, and a second positioning groove which extends in the circumferential direction and is used for the second positioning block to rotate is formed in the partition plate.

Through adopting above-mentioned technical scheme, single second locating piece and second constant head tank, only after second locating piece embedding second constant head tank, the mounting panel just can rotate the installation with tubular part, has stipulated the positive and negative installation order of mounting panel, avoids mounting panel and tubular part to adorn reversely.

Preferably, the switch button comprises a lifting column, a button seat arranged on one side, facing the opening, of the partition plate, a channel for the lifting column to slide and a second button arranged on the control circuit board are arranged in the button seat, the lifting column triggers the second button to move through relative movement of the mounting plate and the tubular portion, an elastic piece for driving the lifting column to be away from the second button through elastic action is arranged between the top of the lifting column and the second button, a through hole penetrates through the channel and faces the groove, a starting block penetrating through the through hole is arranged at the bottom of the lifting column, and a guide inclined surface which is in contact with the second button through contact with the lifting column when the starting block rotates is arranged on the starting block.

By adopting the technical scheme, for the irreplaceable battery, the battery is arranged in the battery cavity in the production process, and the battery cannot be taken out, so that the battery needs to be started by a switch button; when the mounting plate is not mounted on the base, the lifting column is far away from the second button under the action of the elastic piece; after the mounting panel was installed to the base on, stopper and direction inclined plane contact, the elastic force of elastic component was overcome to the drive lift post, moves to the second button, triggers the second button, and the power starts.

Preferably, the side wall of the battery cavity is provided with a sliding hole, the stop groove penetrates through the partition plate and is provided with a stop groove, the tubular part is connected with a sliding block in a sliding manner, the sliding block comprises a trigger block which is connected to the sliding hole in a sliding manner and extends into the battery cavity, the sliding block comprises a stop block which is connected to the stop groove in a sliding manner and extends into the stop groove, a torsion spring is arranged in the tubular part, one end of the torsion spring is connected or contacted with the tubular part, and the other end of the torsion spring is connected with the trigger block; when the battery is not installed, the torsional spring drives the trigger block to move towards the battery cavity under the elastic action, and the stop block is positioned in the stop groove and limits the limiting block to rotate; after the battery is installed, the trigger block leaves the battery cavity and drives the torsion spring to deform, and the stop block is far away from the stop groove and is used for the limiting block to rotate.

By adopting the technical scheme, when the battery is not installed in the battery cavity, the torsion spring drives the stop block to move into the stop groove, namely the stop block is positioned in the rotation range of the limiting block, so that the installation of the installation plate on the tubular part is prevented; when the in-process of installation battery in the battery chamber, the lateral wall and the trigger block butt of battery promote the sliding block along the radial outside removal of tubulose portion, and the drive torsional spring warp, and the dog moves outwards simultaneously, and the stopper can realize the fixed of mounting panel and tubulose portion at keeping off the position inslot rotation.

In conclusion, the invention has the following beneficial effects: when the miniature smoke alarm is installed at the top of the interior of a house, a user presses the cover body at the top, the cover body moves towards the base, the first button on the control circuit board is triggered by the base, and the user can stop the sounding of the smoke alarm and test the smoke alarm in the mode; and after the first button is pressed, the cover body is far away from the position for triggering the first button through the elastic part between the base and the cover body.

Drawings

FIG. 1 is a schematic structural view of embodiment 1 for embodying the structure of a miniature smoke alarm;

FIG. 2 is an exploded view of embodiment 1, showing the positional relationship among the mounting plate, the tubular portion, and the top cover;

FIG. 3 is a schematic structural view of the top cover of embodiment 1;

FIG. 4 is a schematic sectional view of example 1, which is used to show the positional relationship among the support rods, the guide plates, and the arc-shaped partition plates;

FIG. 5 is a schematic view of the structure of a detecting part in embodiment 1;

FIG. 6 is a schematic structural view of the top surface of the tubular portion of example 1;

FIG. 7 is a schematic sectional view showing the connection position of the lid body and the side wall of the tubular body in example 1;

FIG. 8 is a schematic longitudinal sectional view of embodiment 1 for embodying the positions of the first button and the second button;

FIG. 9 is a schematic view of the structure of the bottom surface of the tubular portion of embodiment 1;

FIG. 10 is a schematic structural view of a mounting plate of embodiment 1;

FIG. 11 is a schematic view of the structure of the bottom surface of the tubular portion of embodiment 2;

FIG. 12 is a schematic structural view of the top surface of the tubular portion of embodiment 2;

FIG. 13 is a schematic structural view of a tubular part according to embodiment 4;

FIG. 14 is a schematic sectional view of the elastic part according to example 4;

fig. 15 is a schematic sectional view of embodiment 5 for embodying the structure of the switch knob.

In the figure, 1, a base; 11. mounting a plate; 12. a tubular portion; 13. a cover body; 14. an embedding block is clamped; 15. an opening; 16. a connecting structure; 17. a sound emitting hole; 18. a partition plate; 19. a battery cavity; 2. a detection unit; 21. a sound emitting portion; 22. a support bar; 23. a baffle; 24. an arc-shaped partition plate; 25. a light emitting diode; 26. a through groove; 3. a sliding hole; 31. a baffle groove; 32. a slider; 33. a trigger block; 34. a stopper; 35. a torsion spring; 36. a circular groove; 4. a control circuit board; 41. a first button; 42. a second button; 43. salient points; 5. a smoke inlet hole; 6. an elastic portion; 61. forming holes; 62. an elastic sheet; 63. a spring seat; 64. a spring hole; 65. a compression spring; 66. a trigger switch; 67. a trigger piece; 7. a limiting part; 71. a first stopper; 72. a second limiting block; 8. a switch button; 81. a lifting column; 82. a button seat; 83. a channel; 84. an elastic member; 85. a through hole; 86. a start block; 87. a guide slope; 88. a fixed seat; 9. a groove; 91. a limiting plate; 92. a stop groove; 93. a limiting block; 94. a first positioning block; 95. a first positioning groove; 96. a second positioning block; 97. a second positioning groove; 98. bolt holes; 99. and (7) a cover plate.

Detailed Description

The present invention will be described in further detail with reference to the accompanying drawings.

The present embodiment is only for explaining the present invention, and it is not limited to the present invention, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present invention.

The gist of the present invention is: the problems encountered in miniaturization and microminiaturization of the smoke alarm are overcome on the whole structure; meanwhile, the installation form of the battery has two structures, and the structure of the miniature smoke alarm powered by the cable is provided.

Example 1:

a miniature smoke alarm comprises three parts from bottom to top as shown in figures 1 and 2, namely a mounting plate 11, a tubular part 12 and a cover body 13, wherein the mounting plate 11, the tubular part 12 and the cover body 13 are all formed by injection molding; as shown in fig. 10, the mounting plate 11 is provided with bolt holes 98, and the mounting plate 11 is fixed to a wall surface or a ceiling by passing screws through the bolt holes 98.

As shown in fig. 2 and 6, the tubular portion 12 is in a round tube shape, a partition 18 is integrally formed at the bottom of the tubular portion 12, an opening 15 is formed at the top of the tubular portion 12, the tubular portion 12 plays a role of connecting the cover 13 and the mounting plate 11, a connecting structure 16 is arranged between the bottom of the tubular portion 12 and the mounting plate 11, and a limiting portion 7 for limiting the cover 13 to be separated from the tubular portion 12 through abutting action is arranged between the top of the tubular portion 12 and the cover 13; the cover 13 is provided with a detection part 2 for detecting the smoke concentration, a sound generating part 21 for generating sound waves, the detection part 2 and a control circuit board 4 of the sound generating part 21 from top to bottom, and an elastic part 6 (as shown in fig. 6) for driving the cover 13 to move away from the base 1 along the axial direction of the base 1 is arranged between the cover 13 and the tubular part 12.

As shown in fig. 3, the external structure of the cover 13 is: lid 13 is the pipe structure, and the top of lid 13 is provided with phonate hole 17, and the circumference lateral wall of lid 13 is provided with the cigarette inlet 5 that supplies the smog to get into, and cigarette inlet 5 supplies the smog to enter into in the detection part 2 at the lateral wall evenly distributed of lid 13.

As shown in fig. 3, the smaller the size of the smoke alarm, the smaller the unit amount of air input into the smoke inlet 5, and for the miniature smoke alarm, the position and shape of the smoke inlet 5 greatly affect the sensitivity of the miniature smoke alarm, and in order to overcome the above problems, as shown in fig. 3 and 4, the smoke inlet 5 is formed by support rods 22 extending axially along the cover 13, a flow guide plate 23 disposed between the adjacent support rods 22, and an arc-shaped partition plate 24 extending in the circumferential direction, and the flow guide plate 23 is disposed obliquely.

As shown in fig. 2, the sound emitting portion 21 is a buzzer, and the buzzer is disposed below the sound emitting hole 17 (fig. 3).

As shown in fig. 5, the detecting part 2 is a photoelectric smoke alarm structure, and the specific structure thereof is disclosed in the invention patent with application publication number "CN 102754136A"; two opposite light emitting diodes 25 are arranged at the bottom of the detection part 2, the space inside the cover body 13 is small, the space for the reaction of the detection part 2 is small, the sensitivity of smoke alarm is influenced to a certain extent, and the control circuit board 4 is arranged below the detection part 2, so that two through grooves 26 for embedding the light emitting diodes 25 are arranged on the control circuit board 4, the height of the detection part 2 and the control circuit board 4 is reduced, the height of the detection part 2 can be increased within the same height, and the detection sensitivity is improved.

As shown in fig. 5, a first button 41 is disposed at a central position of the bottom of the control circuit board 4, and a pulse is sent to the control circuit in the control circuit board 4 by pressing the first button 41, so as to trigger the control circuit in the control circuit board 4 to drive the detecting part 2 and the sound-emitting part 21 in fig. 2 to operate; meanwhile, the first button 41 belongs to a button which can automatically rebound after being triggered.

As shown in fig. 6, the specific structure of the tubular portion 12 includes: the battery cavity 19 is positioned on the back side of the partition plate 18 in fig. 6, a battery is arranged in the battery cavity 19, the battery and the battery cavity 19 are packaged into a whole, namely the battery belongs to a non-detachable battery, the positive and negative two stages of the battery are connected with the control circuit board 4 in fig. 2 through a lead, and the lead penetrates through the side wall of the battery cavity 19 and extends towards the cover body 13; the end of the tubular portion 12 axially opposite the partition 18 is an opening 15 for entry of cables in the cover 13 to the battery chamber 19.

As shown in fig. 6, the elastic portion 6 is a molding hole 61 and an elastic sheet 62 disposed on the outer side wall of the battery cavity 19, one molding hole 61 corresponds to one elastic sheet 62, the number of the molding holes 61 is two, the molding holes 61 extend in the width direction of the battery cavity 19, the two molding holes 61 are symmetrically disposed about the center of the upper surface of the battery cavity 19, one end of the elastic sheet 62 is connected to the end of the molding hole 61 in the length direction, and the other end of the elastic sheet 62 extends in the direction of the opening 15 in an inclined manner; the two elastic pieces 62 are arranged in a staggered manner in the vertical projection, and as shown in fig. 8, the inclined end of the elastic piece 62 abuts against the bottom of the control circuit board 4, so that the downward deformation force is converted into the elastic force for driving the cover 13 to move upward.

As shown in fig. 6 and 8, a protrusion 43 is provided at a central position outside the battery cavity 19, the protrusion 43 corresponds to the first button 41 after the cover 13 is covered on the tubular portion 12, and when the cover 13 moves toward the tubular portion 12, the protrusion 43 contacts the first button 41 and presses the first button 41, and in this process, the protrusion 43 reduces the moving stroke of the cover 13.

As shown in fig. 7 and 8, the limiting portion 7 includes a clamping block 14 extending downward along the lower surface of the cover 13, the clamping block 14 is annular, the outer surface of the annular clamping block 14 is attached to the inner wall of the tubular portion 12 at the position of the opening 15, and the clamping block 14 makes the outer surface of the cover 13 flush with the outer surface of the tubular portion 12.

As shown in fig. 7 and 8, the limiting portion 7 further includes a first limiting block 71 disposed on an outer surface of the cover 13 (i.e., an outer surface of the engaging block 14), and a second limiting block 72 disposed on an inner wall of the tubular portion 12 and located in a moving direction of the first limiting block 71, the first limiting block 71 corresponds to the second limiting block 72, and two first limiting blocks 71 are disposed in a circumferential direction of the tubular portion 12; when the cap is mounted, the first stopper 71 and the second stopper 72 move back to back in the horizontal direction to deform, so that the cap 13 is inserted into the tubular portion 12, and in the use process, the first stopper 71 and the second stopper 72 abut against each other in the height direction to limit the cap 13 from being separated from the tubular portion 12; the stopper 7 serves to connect the cover 13 and the tubular portion 12 in this process.

As shown in fig. 8, a switch button 8 for controlling the start and the stop of the battery is arranged on the partition plate 18, and the switch button 8 is suitable for the condition that the battery is not detachable, so that the false triggering of the miniature smoke alarm is avoided; if a removable battery is used, the battery is not enclosed in the battery cavity 19 until the smoke alarm is shipped and not in use.

As shown in fig. 8, the switch button 8 includes a button seat 82 disposed on one side of the partition 18 facing the cover 13, the button seat 82 is axially provided with a channel 83 in a penetrating manner, a lifting column 81 is slidably connected in the channel 83, a second button 42 disposed on the control circuit board 4 is activated and deactivated, the second button 42 controls the power on and off of the battery, the second button 42 has the same structure as the first button 41, the button seat 82 is disposed directly below the second button 42, a starting block 86 is disposed at a lower end of the lifting column 81 in the length direction, a through hole 85 for the starting block 86 to pass through is disposed below the channel 83 of the partition 18, an elastic member 84 is disposed at an upper end of the lifting column 81 in the length direction (i.e., the elastic member 84 is disposed between the control circuit board 4 and the lifting column 81), the elastic member 84 is a spring, and an inner space of the spring is larger than the second button 42, so as to prevent the spring from triggering the second button 42. During use, the lifting column 81 is driven to move by pressing the actuating block 86 on the battery cavity 19 side of the partition 18, triggering the second button 42 to act, and then the elastic member 84 drives the lifting column 81 away from the second button 42.

As shown in fig. 10, the diameter of the mounting plate 11 is larger than the diameter of the tubular portion 12; the connection 16 between the mounting plate 11 and the tubular part 12 comprises a circular groove 36 provided on the mounting plate 11 in which the tubular part 12 is inserted.

As shown in fig. 9 and 10, the partition 18 of the tubular portion 12 is recessed along its axial direction toward the opening 15 to form a groove 9, an outward portion of the groove 9 extends along the circumferential direction of the tubular portion 12 to form a limit plate 91, a stop groove 92 is formed between the bottom surface of the limit plate 91 and the bottom surface of the groove 9, and a stop block 93 capable of sliding into the stop groove 92 is disposed in the circular groove 36 of the mounting plate 11; the two limiting blocks 93 are arranged in the circumferential direction of the circular groove 36 and are symmetrically distributed, and the bolt hole 98 is arranged on each limiting block 93.

As shown in fig. 8, in the using process, the mounting plate 11 and the tubular portion 12 are rotated, the limit block 93 is embedded into the blocking groove 92, and the mounting plate 11 is prevented from being separated from the tubular portion 12 by the abutting action of the limit block 93 and the blocking groove 92.

As shown in fig. 9 and 10, after the limiting block 93 and the blocking groove 92 are fixed at a proper position, in order to avoid the mounting plate 11 and the tubular portion 12 from loosening in the circumferential direction, a first positioning block 94 is arranged on the side wall of the groove 9, as shown in fig. 10, a first positioning groove 95 is arranged on the side wall of the limiting block 93, the cross-sectional shapes of the first positioning block 94 and the first positioning groove 95 are semicircular, in the process that the mounting plate 11 and the tubular portion 12 rotate, the first positioning block 94 rotates along with the mounting plate 11, and the first positioning block 94 deforms to enter the first positioning groove 95, so that the mounting plate 11 and the tubular portion 12 are clamped and fixed.

As shown in fig. 9 and 10, in order to avoid the reverse installation of the mounting plate 11 and the tubular portion 12, a second positioning block 96 extends axially from the bottom of the mounting plate 11, a second positioning groove 97 extending circumferentially and allowing the second positioning block 96 to rotate is provided on the partition plate 18, after the limiting block 93 on the mounting plate 11 is installed to a wrong position, the second positioning block 96 cannot enter the second positioning groove 97, that is, the limiting block 93 and the blocking position groove 92 are staggered in the height direction and cannot be mutually clamped, so that the reverse installation of the mounting plate 11 and the tubular portion 12 is avoided.

As shown in fig. 9 and 10, in order to automatically start the power supply during the installation of the mounting plate 11 and the tubular portion 12, the start block 86 is provided with a guide slope 87 capable of contacting with the surface of the stopper 93, and the guide slope 87 gradually contacts with the stopper 93 and the lifting column 81 gradually moves upward to press the second button 42 while the stopper 93 slides into the stopper groove 92.

Installation procedure of example 1: the mounting plate 11 is fixed on a wall surface or a ceiling through a screw, the battery is fixed in the battery cavity 19 of the tubular body, the limit block 93 is clamped in the groove 9, then the mounting plate 11 is rotated, the limit block 93 enters the position blocking groove 92, and meanwhile, the lifting column 81 is shifted to move upwards to trigger the second button 42 to electrify the control circuit board 4; when the first positioning block 94 is moved to the position where it is engaged with the first positioning groove 95, the mounting plate 11 is fixed to the tubular portion 12.

Procedure for use of example 1: by pressing the cover 13, the bump 43 triggers the first button 41 (without the bump 43, the outer side wall of the battery cavity 19 can also trigger the first button 41), and the control circuit board 4 controls the sound-emitting part 21 to emit sound for a short time or stops emitting sound; when smoke enters the cover body 13 from the smoke inlet 5, the detection part 2 sends an electric signal to the control circuit board 4, and the control circuit board 4 drives the sound-producing part 21 to produce sound to remind a user of firing.

Example 2:

a miniature smoke alarm is disclosed, wherein embodiment 2 is different from embodiment 1 in that the structure of a tubular part 12 is different in embodiment 2, and a structure capable of replacing a battery is adopted in the tubular part 12.

Because the battery is only installed in the using process, the switch button 8 is not needed to be arranged on the miniature smoke alarm; the problem is solved, therefore, by confirming that the installed miniature smoke alarm has a battery therein.

As shown in fig. 11 and 12, a sliding hole 3 is formed on one side of the inside of the tubular part 12, a blocking groove 31 is formed on the blocking groove 92 penetrating through the partition plate 18, a sliding block 32 is connected in the blocking groove 31 in a sliding manner, and a trigger block 33 is formed at one end of the sliding block 32 facing the battery cavity 19; during the sliding process of the sliding block 32, the trigger block 33 can move into the battery cavity 19; the sliding block 32 further comprises a stop block 34 connected to the blocking groove 31 in a sliding manner and extending into the blocking groove 92, a torsion spring 35 is arranged in the tubular part 12, one end of the torsion spring 35 is abutted against the tubular part 12, the other end of the torsion spring 35 is connected with the trigger block 33, and the torsion spring 35 can drive the sliding block 32 to reset; the partition 18 is connected with a fixed seat 88 through a bolt, the fixed seat 88 limits the sliding direction of the sliding block 32, and limits the sliding block 32 to be separated from the sliding hole 3.

Meanwhile, in order to prevent the replaceable battery from falling off, a cover plate 99 (see fig. 2) is embedded on the battery cavity 19, and the cover plate 99 prevents the battery from being detached.

The installation procedure of example 2 was: the installation process of the embodiment 2 is the same as that of the embodiment 1, and the installation steps of the batteries are added, when the batteries are not installed, the torsion spring 35 drives the trigger block 33 to move towards the battery cavity 19 through the elastic action, and the stop block 34 is positioned in the stop groove 92 and limits the limiting block 93 to rotate; when the battery is loaded, the trigger block 33 leaves the battery cavity 19 and drives the torsion spring 35 to deform, and the stopper 34 leaves the stop groove 92 and allows the stopper 93 to rotate, so that the mounting plate 11 and the tubular part 12 are fixed.

Example 3:

the embodiment 3 is different from the embodiment 1 in that the embodiment 2 adopts a cable power supply mode, in the embodiment 3, as shown in figures 1 and 2, a tubular part 12 and a mounting plate 11 do not need to rotate, namely, the tubular part 12 and the mounting plate 11 are integrally formed to form a base 1, and a detection part 2, a sound generating part 21 and a control circuit board 4 in the base 1 are connected with cables in the house.

Example 3 installation procedure: embodiment 3 is less costly and has a longer service life, requiring only the connection of the cable to the terminals on the base 1.

The application process of embodiment 3 is the same as that of embodiment 1, and is not described herein.

Example 4:

as shown in fig. 13 and 14, the miniature smoke alarm of embodiment 4 is different from that of embodiment 1 in that in embodiment 4, in order to prolong the service life of the miniature smoke alarm, the elastic part 6 does not adopt the form of an elastic sheet, the elastic part 6 in embodiment 4 comprises a spring seat 63 arranged on the partition plate 18, and two spring seats 63 are respectively arranged on two sides of the battery cavity 19.

As shown in fig. 13 and 14, a spring hole 64 is provided in the spring seat 63, the spring hole 64 extending in the height direction of the spring seat 63, and a compression spring 65 is provided in the spring hole 64; when the cover 13 (not shown) is closed to the tubular portion 12, the compression spring 65 abuts against the bottom of the control circuit board 4, and the compression spring 65 is in a compressed state.

Embodiment 4 plays a role of springing up the lid body 13 (not shown in the figure) by the elastic action of the compression spring 65 during use, and the compression spring 65 made of metal has a longer life as compared with the elastic piece 62.

Example 5:

as shown in fig. 15, a miniature smoke alarm, embodiment 5 differs from embodiment 1 in that in embodiment 4, in order to simplify the production process, simplification is made on the switch knob 8, the switch knob 8 of embodiment 5 takes the form of a trigger switch 66, the trigger switch 66 includes a trigger piece 67 disposed obliquely downward, the end of the trigger piece 67 is semicircular, a through hole 85 is provided for the semicircular end of the trigger piece 67 to pass through, and the semicircular end of the trigger piece 67 protrudes from the lower surface of the through hole 85.

Embodiment 5 is the same as embodiment 1 in the using process and the action process, except that the second button 42 (not shown in the figure) and the lifting column 81 (not shown in the figure) are replaced by the trigger switch 66, when the mounting plate 11 is rotated, the limit block 93 contacts with the semicircular end part of the trigger sheet 67 to jack the trigger sheet 67 upwards, and the trigger switch 66 transmits the model number to the control circuit board 4 (not shown in the figure) to control the power supply to start.

Claims

1. A miniature smoke alarm which is characterized in that: comprises a base (1) and a cover body (13) axially moving along the base (1), wherein a detection part (2) for detecting smoke concentration, a sounding part (21) for generating sound waves, a control circuit board (4) for controlling the detection part (2) and the sounding part (21) are arranged in the cover body (13), a smoke inlet (5) for smoke to enter the detection part (2) is arranged on the side wall of the cover body (13), an elastic part (6) for driving the cover body (13) to be far away from the base (1) through elastic action is arranged between the cover body (13) and the base (1), a limiting part (7) for limiting the separation of the cover body (13) from the base (1) through abutting action is arranged between the cover body (13) and the base (1), and a first button (41) triggered by the movement of the cover body (13) towards the base (1) is arranged on one surface of the control circuit board (4) facing the base (1), the first button (41) controls the testing and stopping of the smoke alarm, and the detection part (2) and the sounding part (21) are electrically connected with a power supply in the base (1); the base (1) comprises a mounting plate (11) and a tubular part (12) connected to the mounting plate (11), a partition plate (18) is arranged at the bottom of the tubular part (12), a battery cavity (19) for placing a battery is formed in the partition plate (18) along the axial direction of the tubular part (12) in a concave mode, and an opening (15) for moving a cover body (13) is formed in the top of the tubular part (12); the elastic part (6) comprises a forming hole (61) arranged on the outer side wall of the battery cavity (19) and an elastic sheet (62) which extends to the opening (15) along the inclination of the side wall of the forming hole (61), a switch button (8) for controlling the power supply to start and close is arranged between the base (1) and the tubular part (12), the partition plate (18) is recessed towards the opening (15) along the axial direction to form a groove (9), the groove (9) extends along the circumferential direction of the tubular object to form a limiting plate (91), a retaining groove (92) is formed between the bottom surface of the limiting plate (91) and the bottom surface of the groove (9), a limiting block (93) capable of sliding into the retaining groove (92) is arranged on the mounting plate (11), a first positioning block (94) is arranged on the side wall of the groove (9), a first positioning groove (95) matched with the first positioning block (94) to limit the rotation of the partition plate (18) is arranged on the side wall of the limiting block, the bottom of the mounting plate (11) extends along the axial direction to form a second positioning block (96), the partition plate (18) is provided with a second positioning groove (97) which extends along the circumferential direction and is used for rotating the second positioning block (96), the switch button (8) comprises a lifting column (81), a button seat (82) which is arranged on one side, facing the opening (15), of the partition plate (18), a channel (83) which is used for the lifting column (81) to slide and a second button (42) which is arranged on the control circuit board (4) are arranged in the button seat (82), the lifting column (81) triggers the second button (42) to move through the relative movement of the mounting plate (11) and the tubular part (12), an elastic piece (84) which drives the lifting column (81) to be far away from the second button (42) through the elastic action is arranged between the top of the lifting column (81) and the second button (42), and a through hole (85) penetrates through the channel (83) towards the groove (9), the bottom of the lifting column (81) is provided with a starting block (86) penetrating through the through hole (85), and a guide inclined plane (87) which is contacted with the second button (42) through the contact driving of the lifting column (81) when the lifting column rotates with the limiting block (93) is arranged on the starting block (86).

2. The miniature smoke alarm of claim 1, wherein: the number of the forming holes (61) is at least two in the radial direction of the tubular part (12), and the projections of the adjacent elastic sheets (62) in the vertical direction are arranged in a staggered mode.

3. The miniature smoke alarm of claim 1, wherein: the limiting part (7) comprises a first limiting block (71) arranged on the cover body (13) and a second limiting block (72) arranged on the inner wall of the tubular part (12) and positioned in the moving direction of the first limiting block (71).