CN114652985A

CN114652985A - Backpack fire extinguisher

Info

Publication number: CN114652985A
Application number: CN202210334762.XA
Authority: CN
Inventors: 原玉玺; 姜波
Original assignee: Individual
Current assignee: Individual
Priority date: 2022-03-31
Filing date: 2022-03-31
Publication date: 2022-06-24

Abstract

The application provides a backpack fire extinguisher, which comprises a backpack frame and a fire extinguisher body which can be arranged on the backpack frame in a picking and placing way, wherein the backpack frame comprises an inflatable back plate with a chute, straps respectively arranged at two sides of the inflatable back plate, a mounting seat and an alarm device; the mounting seat is used for fixing the fire extinguisher body and is provided with a sliding block which can be matched with the sliding groove; the inflatable back plate comprises an elastic part and a detection part connected with the alarm device, and the elastic part is arranged at the bottom of the sliding groove; along with the change of fire extinguisher body weight, the elastic component can switch between compression state and release state to drive the mount pad and move about relative to the spout. By arranging the inflatable back plate with the inflatable cavity, discomfort of the back of a fireman in the using process can be relieved; secondly, along with the change of fire extinguisher body weight, the elastic component loosens gradually for the slider can contact or separate with the detection piece, triggers alarm device with this, reaches the effect of monitoring the internal capacity of fire extinguisher.

Description

Backpack fire extinguisher

Technical Field

The application relates to the technical field of fire-fighting equipment, in particular to a backpack fire extinguisher.

Background

In daily life, a fire frequently occurs, and when a fire occurs, a fire extinguisher is the most common and basic fire-fighting equipment, and can play a good role in coping with the fire.

At present, most of the fire extinguishers in the market mainly adopt portable fire extinguishers, and the fire extinguishers are heavy in weight, inconvenient to carry and complex to operate; therefore, backpack fire extinguishers begin to appear in the market, but the backrest of the traditional backpack fire extinguishers is hard, and the waist and the back of a user are uncomfortable after wearing the backpack fire extinguishers for a long time; secondly, traditional backpack fire extinguisher is in the use, and the user can not timely know the surplus of dry powder, foam or gas in the fire extinguisher, can not carry out timely change to the fire extinguisher, influences the efficiency of fire fighting, still can threaten user's safety when serious.

Therefore, the prior art is yet to be further improved.

Disclosure of Invention

The invention provides a backpack fire extinguisher, which aims to solve at least one technical problem in the technical problems.

The technical scheme adopted by the invention is as follows:

the application provides a backpack fire extinguisher, which comprises a backpack frame and a fire extinguisher body which can be arranged on the backpack frame in a picking and placing way, wherein the backpack frame comprises an inflatable back plate with a chute, straps and mounting seats which are respectively arranged at two sides of the inflatable back plate, and an alarm device; the mounting seat is used for fixing the fire extinguisher body and is provided with a sliding block which can be matched with the sliding groove; the inflatable back plate comprises an elastic part and a detection part connected with the alarm device, and the elastic part is arranged at the bottom of the sliding groove and can be abutted against the sliding block; along with the change of the weight of the fire extinguisher body, the elastic piece can be switched between a compression state and a release state so as to drive the mounting seat to move up and down relative to the sliding groove, and the alarm device sends out an alarm signal through the triggering action between the sliding block and the detection piece.

As a preferred embodiment of this application, the mount pad includes the holder that has arc bayonet socket, and the holder has unblock state and locking state, and through the switching between unblock state and the locking state to realize dismantling the connection between fire extinguisher body and the mount pad.

As a preferred embodiment of this application, the arc bayonet socket of holder is provided with first adjusting part to through adjusting first adjusting part, enlarge and reduce the area of holding with of holder to adapt to the fire extinguisher body of different diameter sizes.

As a preferred embodiment of the application, the detection piece is a touch switch arranged on the side wall of the sliding groove, and the sliding block can be contacted with or separated from the touch switch in the process of moving the fire extinguisher body up and down relative to the inflatable back plate.

As a preferred embodiment of this application, the detection piece is the photosensitive switch who sets up in the spout lateral wall, and in the in-process of fire extinguisher body for aerifing the backplate up-and-down motion, the slider can shelter from photosensitive switch to make the detection piece trigger.

As a preferred embodiment of the present application, the side wall of the chute is provided with an adjusting window, and a second adjusting member extends outward; the detection piece is arranged in the adjusting window and is connected with the second adjusting piece so as to drive the detection piece to move up and down in the adjusting window by changing the position of the second adjusting piece.

As an optimal implementation mode of the application, the backpack frame further comprises a mounting plate and a spray gun, the mounting plate is arranged below the inflatable back plate and is provided with an interface, and the spray gun is communicated with an outlet of the fire extinguisher body through the interface.

As a preferred embodiment of this application, the side of aerifing the backplate is provided with the mounting, and the mounting can with the spray gun bayonet connection to fix the spray gun.

As a preferred embodiment of the present application, the side edges of the inflatable back panel are extended outwardly with a waist-protecting panel.

As a preferred embodiment of the present application, the alarm device includes a flashing light and a buzzer to emit light and sound when the alarm device is triggered.

Due to the adoption of the technical scheme, the technical effects obtained by the application are as follows:

1. according to the backpack frame, the inflatable back plate with the inflatable cavity is arranged, so that the whole weight of the backpack frame can be reduced by the internal inflatable structure, the flexibility of the back plate is ensured, the back plate is attached to the back of a fireman, the discomfort of the back of the fireman in the using process can be relieved, and the comfort of the fireman in the using process is improved; secondly, through spout and slider sliding connection between mount pad and the aerify backplate, can play certain cushioning effect to fire extinguisher body, and, aerify the backplate and be provided with the detection piece, after the fire extinguisher used a period, fire extinguisher body's weight alleviates, the elastic component relaxs gradually, promote slider rebound, make the slider can contact or separate with the detection piece, trigger alarm device with this, reach the effect of monitoring the weight of fire extinguisher, and remind the fire fighter in time to change fire extinguisher body.

2. As a preferred embodiment of the application, the mounting seat further comprises a clamping piece with an arc-shaped bayonet, the arc-shaped bayonet can be matched with the shape of the cross section of the fire extinguisher, and meanwhile, the clamping piece has an unlocking state and a locking state, so that the fire extinguisher body is detachably connected with the back carrying frame, and the fire extinguisher body is convenient to replace; in addition, the clamping piece can be freely adjusted by adjusting the first adjusting piece to correspond to fire extinguisher bodies with different diameters, so that the backpack fire extinguisher can be used for replacing different fire extinguisher bodies under different conditions.

3. As a preferred embodiment of the present application, the side wall of the chute is provided with an adjusting window, and a second adjusting member extends outward; the detection piece is arranged in the adjusting window and is connected with the second adjusting piece, so that the position of the second adjusting piece is changed to drive the detection piece to move up and down in the adjusting window, the position of the detection piece can be adjusted according to fire extinguisher bodies with different weights, the alarm error is reduced, and the service environment of the expansion equipment is improved.

4. As a preferred embodiment of this application, the side of aerifing the backplate is provided with the mounting to bayonet joint between the spray gun for the spray gun can be when the fire fighter does not put out a fire the work, fixes the spray gun on aerifing the backplate, the action of the fire fighter of being convenient for.

5. As a preferred embodiment of this application, aerify backplate side edge and be provided with waist protection board, can wrap up fire fighter's waist, further improve the comfort level of fire fighter in the use to can play certain guard action to fire fighter's waist.

6. As an preferred embodiment of this application, alarm device includes flashing light and bee calling organ, be backpack fire extinguisher when reporting to the police, send scintillation and sound simultaneously, when making fire fighter itself can know alarm information more easily, sound and light also can discover alarm information to fire fighter teammate around and stranded personnel in the conflagration, can make teammate and stranded personnel know user's position, increase user's security, and simultaneously, make stranded personnel can discover the fire fighter, and in time send out the SOS.

Drawings

FIG. 1 is a schematic structural view of a backpack fire extinguisher according to an embodiment of the present application;

FIG. 2 is a schematic structural view of a backpack frame according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural view of another backpack frame provided by the embodiment of the present application;

FIG. 4 is a schematic view of another backpack frame according to an embodiment of the present disclosure;

fig. 5 is a schematic structural view of another backpack fire extinguisher provided by the embodiment of the application.

Reference numerals are as follows:

100 backpack frames, 200 fire extinguisher bodies, 101 inflatable back plates, 1011 chutes, 1012 alarm devices, 102 straps, 103 sliders, 104 clamping pieces, 105 detection pieces, 106 elastic pieces, 107 first adjusting pieces, 108 adjusting windows, 109 second adjusting pieces, 110 mounting plates, 1101 quick-release devices, 111 interfaces, 112 spray guns, 1121 spray heads, 113 fixing pieces and 114 waist protection plates.

Detailed Description

In order to more clearly explain the overall concept of the present application, the following detailed description is given by way of example in conjunction with the accompanying drawings.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present application, however, the present application may be practiced in other ways than those described herein, and therefore the scope of the present application is not limited by the specific embodiments disclosed below.

In addition, in the description of the present application, it is to be understood that the terms "top," "bottom," "inner," "outer," "axial," "radial," "circumferential," and the like refer to orientations or positional relationships based on those illustrated in the drawings, merely to facilitate description of the application and to simplify description, and do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be considered limiting of the present application.

In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; the connection can be mechanical connection, electrical connection or communication; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.

In this application, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may be directly contacting the first and second features or indirectly contacting the first and second features through intervening media. In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above are not necessarily intended to refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

As shown in figures 1-2, a backpack fire extinguisher comprises a backpack 100 and a fire extinguisher body 200 which is arranged on the backpack 100 in a pick-and-place way, the backpack 100 comprises an inflatable back plate 101 with a chute 1011, straps 102 and mounting seats (not marked in the figures) which are respectively arranged on both sides of the inflatable back plate 101, and an alarm device 1012.

The mounting seat is used for fixing the fire extinguisher body 200 and is provided with a sliding block 103 which can be matched with the sliding groove 1011; the inflatable backboard 101 comprises an elastic member 106 and a detecting member 105 connected with the alarm device 1012, wherein the elastic member 106 is arranged at the bottom of the sliding groove 1011 and can be abutted against the sliding block 103.

Specifically, along with the change of the weight of the fire extinguisher body 200, the elastic member 106 can be switched between a compressed state and a released state to drive the mounting seat to move up and down relative to the sliding groove 1011, and the alarm device 1012 sends out an alarm signal through the triggering action between the sliding block 103 and the detecting member 105.

The inflatable back plate further comprises an inflatable layer (not shown in the figure) and a mounting layer (not shown in the figure), wherein the mounting layer is attached to the inflatable layer and is provided with the sliding groove 1011, so that the fire extinguisher body 200 can be mounted conveniently, and the strength of the inflatable back plate is improved; aerify the inside on layer and be provided with composite fiber (not shown in the figure), composite fiber can improve aerify the holistic intensity of backplate 101 to through inside aerifing, alleviate its total weight, make it keeps certain structure to aerify backplate 101, makes its back that can laminate the firefighter, can alleviate the discomfort on firefighter's back in the use, improves the travelling comfort of firefighter in the use.

Further, the mounting seat comprises a clamping piece 104 with an arc-shaped bayonet, the clamping piece 104 is provided with an unlocking state and a locking state, and the detachable connection between the fire extinguisher body 200 and the mounting seat is realized through switching between the unlocking state and the locking state.

In addition, the clamping member 104 can be provided with a first adjusting member 107, and the clamping area of the clamping member 104 can be enlarged and reduced by adjusting the first adjusting member 107 so as to adapt to fire extinguisher bodies 200 with different diameters.

As an optional embodiment of the present application, the first adjusting member 107 may be selected from an adjusting bolt, the clamping member 104 includes a first clamping jaw (not shown in the figure) and a second clamping jaw (not shown in the figure) hinged to each other, and the top ends of the first clamping jaw and the second clamping jaw are connected through the adjusting bolt, so that the distance between the top end of the first clamping jaw and the top end of the second clamping jaw is enlarged and reduced by rotating the adjusting bolt, and further the clamping area of the clamping member 104 is changed to adapt to fire extinguisher bodies 200 with different diameters.

As shown in fig. 2 to 4, as an embodiment of the present application, the detecting element 105 is a trigger switch disposed on an inner wall of the sliding groove 1011, and the sliding block 103 can contact or separate from the trigger switch during the up-and-down movement of the fire extinguisher body 200 relative to the gas-filled back plate 101.

The touch switch may be a push switch, and specifically, the weight of the fire extinguisher body 200 is reduced, so that the elastic member 106 pushes the slider 103 to move upward and press the push switch, and the alarm device 1012 is triggered to alarm, thereby monitoring the weight of the fire extinguisher body 200.

As another specific embodiment of the present application, the detecting element 105 is a light-sensitive switch disposed on the inner wall of the sliding groove 1011, and in the process that the fire extinguisher body 200 moves up and down relative to the gas-filled back plate 101, the slider 103 can shield the light-sensitive switch, so that the detecting element 105 is triggered.

It should be noted that the specific triggering alarm mode of the photosensitive switch is the same as the triggering alarm mode of the trigger switch, and both are realized by the contact and separation of the slider 103 and the photosensitive switch; therefore, the description is not repeated herein; in addition, the above embodiments are only two optional embodiments, and any switch that can cooperate with the slider 103 to achieve the alarm triggering effect may be used.

As shown in fig. 1-2, preferably, the side wall of the sliding groove 1011 is opened with an adjusting window 108, and a second adjusting member 109 extends outwards; the detecting element 105 is disposed in the adjusting window 108 and connected to the second adjusting element 109, so that the position of the second adjusting element 109 is changed to drive the detecting element 105 to move up and down in the adjusting window 108.

The lateral wall of adjusting window 108 can be provided with the graduation apparatus, adjusting bolt can be chooseed for use to the second regulating part, through the rotation adjusting bolt makes adjusting bolt with fastening or separation between the adjusting window 108, and adjusting bolt with during the adjusting window 108 separation, adjusting bolt can reciprocate in the adjusting window, and drive detecting part 105 removes extremely the different scales department of graduation apparatus, screws up adjusting bolt again, makes the bolt with adjusting window 108 closely laminates, in order to fix detecting part 105's position, with this adjusts fire extinguisher body 200 to different weight detecting part 105's position, reduces the error that weight detected, can avoid alarm device 1012 misreport.

The specific setting position of the detecting element 105 can be set according to the difference between the slider 103 and the trigger type:

for example, when the two blocks 103 are connected to each other by a connecting rod, the position of the detecting member 105 may be set at the middle position of the sliding groove 1011; alternatively, when the slider 103 is a whole, the detecting member 105 may be disposed on the upper portion or the lower portion of the sliding groove 1011.

Specifically, as shown in fig. 2, when the detecting member 105 is triggered by contact and the sliding block 103 is a whole, the detecting member 105 can be disposed on the upper portion of the sliding groove 1011, the fire extinguisher body 200 gradually loses its weight during use, the elastic member 106 gradually loosens and pushes the sliding block 103 upwards until the fire extinguishing agent or fire extinguishing gas in the fire extinguisher body 200 is exhausted, and at this time, the sliding block 103 contacts the detecting member 105 and triggers the detecting member 105, so that the alarm device 1012 gives an alarm.

As shown in fig. 3, when the detecting member 105 is separately triggered and the sliding block 103 is a whole, the detecting member 105 can be disposed at the lower part of the sliding slot 1011, and the sliding block 103 presses the detecting member 105, when the fire extinguisher body 200 is lightened, the elastic member 106 also pushes the sliding block 103 to move upwards and gradually move away from the detecting member 105, and when the fire extinguishing agent or the fire extinguishing gas in the fire extinguisher body 200 is used up, the sliding block 103 is completely separated from the detecting member 105 and triggers the detecting member 105, so that the alarm device 1012 gives an alarm.

It should be noted that, as shown in fig. 3, the two sliders 103 are connected to each other through a connecting rod (not labeled in the figure), the position of the detecting element 105 may be set at the middle position of the sliding slot 1011, or may be set at the upper portion or the lower portion of the sliding slot 1011, and the triggering manner is the same as that when the sliders 103 are integrated, so that redundant description is not repeated herein.

As a preferred embodiment of the present application, the backpack frame 100 further includes a mounting plate 110 and a spray gun 112, the mounting plate 110 is disposed below the inflatable back plate 101 and is opened with a connector 111, and the spray gun 112 is communicated with an outlet of the fire extinguisher body 200 through the connector 111.

As shown in fig. 1, a quick release device 1101 connected to the detecting element 105 may be optionally disposed on the mounting plate 110, and the quick release device 1101 may receive a signal sent by the detecting element, process and respond to the received signal, so as to enable the detecting element to open and close automatically. The quick release device 1101 includes a first clamping member (not shown) and a second clamping member (not shown), and both the first clamping member and the second clamping member are hinged to the mounting plate 110. The connecting surface of the first clamping piece and the second clamping piece can be further provided with an electromagnet (not shown in the figure), so that the first clamping piece and the second clamping piece can be separated and combined through the on-off of the electromagnet.

In a particular example, when the extinguisher body 200 is depleted, the detecting member 105 is activated and is able to send a detection signal to the alarm 1012, causing the alarm 1012 to emit an alarm signal. Meanwhile, the quick release device 1101 can also receive a detection signal sent by the detection piece 105, and control the opening and closing of the electromagnet according to the obtained detection signal, so that the first clamping piece and the second clamping piece are separated.

In addition, in this embodiment, the quick release device 1101 may be configured to be triggered in a delayed manner, specifically, for example, after the quick release device 1101 receives the detection signal of the detection piece 105, the quick release device 1101 may enable the electromagnet to be powered on and powered off after a preset time (for example, 5s, 10s, etc.) based on the obtained detection signal, and adjust the polarities of the two oppositely disposed electromagnets, so that the first clamping piece and the second clamping piece are sprung away from each other under the action of the repulsive force generated by the electromagnet.

Furthermore, in the present embodiment, the inner walls of the first clamping member and the second clamping member may be respectively provided with a gasket (not shown in the figure). On one hand, the fire extinguisher body can be more tightly fixed during installation by arranging the sealing gasket, so that the stability and the safety of the backpack fire extinguisher are improved; on the other hand, the arrangement mode can seal the outlet of the fire extinguisher body 200 and the interface 111 arranged on the mounting plate, so that the backpack fire extinguisher has better sealing performance.

The arrangement mode of the quick release device 1101 can facilitate the fire fighter to quickly replace the fire extinguisher body 200, and the rescue efficiency is improved. In actual operation, the fire fighter can replace the fire extinguisher body 200 by simply pulling the old fire extinguisher body 200 out of the interface 111 and then inserting the new fire extinguisher body 200 into the interface 111. In addition, the quick-release device 1101 can be opened and closed based on the weight change of the fire extinguisher body 200, so that the backpack fire extinguisher provided by the application is more intelligent and humanized, the operation of rescue workers can be simplified, the rescue time can be greatly saved, the precious time and energy of the rescue workers can be released from trivial things of replacing rescue appliances, more energy can be put into the nervous rescue work by the rescue workers, and the personal and property safety of the masses can be protected.

As shown in fig. 2 to 4, the spray gun 112 may optionally include a spray head 1121, the spray head 1121 has a holding portion (not shown) that is convenient for a fire fighter to hold the spray gun 112 for fire extinguishing work, and an adjusting switch (not shown) that is capable of adjusting the spraying amount of the spray gun 112 for different fires, so as to save resources in the fire extinguisher body 200 and improve work efficiency.

In addition, the nozzle 1121 may be a replaceable nozzle, and may also be replaced according to different fire conditions to adapt to different working environments.

Further, a fixing member 113 is disposed on a side surface of the inflatable backing plate 101, and the fixing member 113 is in bayonet connection with the spray gun 112 to fix the spray gun 112. Wherein, the fixing member 113 can be rotatably connected with the side of the inflatable backboard 101 to adjust the fixing direction of the spray gun 112 according to the habit and working state of the fireman.

As shown in fig. 5, a waist support plate 114 preferably extends outwardly from the side edge of the inflatable back panel 101, and the waist support plate 114 can wrap the waist of the firefighter, so as to further improve the comfort of the firefighter during use and protect the waist of the firefighter.

As an optional implementation manner of the present application, the alarm device 1012 includes a flashing light and a buzzer, so that the alarm device 1012 emits light and sound when triggered, and when making the firefighter himself able to know the alarm information more easily, the sound and the light also enable surrounding firefighters teammates and stranded personnel in a fire to find the alarm information, so that the teammates and the stranded personnel can know the position of the user, increasing the safety of the user, and at the same time, the stranded personnel can find the firefighter and send out a help in time.

Further, the backpack frame 100 may further include a main control chip (not shown), and the main control chip includes a positioning unit, an information processing unit, and an information transmission unit, and is connected to the detecting element 105 and the alarm device 1012 respectively.

The positioning unit can position the position of a fireman in real time, and when the fireman does not move for a long time, the information transmission unit can transmit signals to the fire center so as to contact the fireman and reinforce the fireman in time; secondly, the information processing unit can record and analyze the alarm condition of the alarm device 1012 and the triggering condition of the detection piece 105 in real time, when the detection piece 105 is triggered but the alarm device 1012 does not alarm, the information transmission unit also transmits a signal to a fire center and the fire center contacts fire fighters so as to reduce the occurrence of accidents caused by damage of the alarm device 1012 or the detection piece 105.

Optionally, a small tool bag (not shown) may be disposed on the mounting plate 110 for placing small tools such as an emergency oxygen bag, a folding fire axe, a laser flashlight, etc. to deal with different situations and perform rescue.

Where not mentioned in this application, can be accomplished using or referencing existing technology.

The embodiments in the present specification are described in a progressive manner, and the same and similar parts among the embodiments are referred to each other, and each embodiment focuses on the differences from the other embodiments.

The above description is only an example of the present application and is not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.

Claims

1. A backpack fire extinguisher comprises a backpack frame and a fire extinguisher body which is arranged on the backpack frame in a pick-and-place way, and is characterized in that the backpack frame comprises an inflatable back plate with a chute, straps and a mounting seat which are respectively arranged on two sides of the inflatable back plate, and an alarm device;

the mounting seat is used for fixing the fire extinguisher body and is provided with a sliding block which can be matched with the sliding groove;

the inflatable back plate comprises an elastic part and a detection part connected with the alarm device, and the elastic part is arranged at the bottom of the sliding groove and can be abutted against the sliding block;

along with the change of the weight of the fire extinguisher body, the elastic piece can be switched between a compression state and a release state so as to drive the mounting seat to move up and down relative to the chute, and the alarm device sends out an alarm signal through the triggering action between the sliding block and the detection piece.

2. The backpack fire extinguisher of claim 1, wherein the mounting base includes a clamping member having an arc-shaped bayonet, the clamping member having an unlocked state and a locked state, and the detachable connection between the extinguisher body and the mounting base is achieved by switching between the unlocked state and the locked state.

3. The backpack type fire extinguisher as claimed in claim 2, wherein the arc-shaped bayonet of the clamping member is provided with a first adjusting member, and the holding area of the clamping member is enlarged and reduced by adjusting the first adjusting member to be adapted to fire extinguisher bodies having different diameters.

4. The backpack fire extinguisher of claim 3, wherein the sensing member is a trigger switch disposed on a side wall of the chute, and the slider is capable of contacting or separating with the trigger switch during the up and down movement of the fire extinguisher body with respect to the gas-filled back plate.

5. The backpack fire extinguisher according to claim 3, wherein the detecting member is a light sensitive switch disposed on a side wall of the chute, and the slider blocks the light sensitive switch to trigger the detecting member during the up and down movement of the fire extinguisher body with respect to the back plate.

6. The backpack fire extinguisher as claimed in any one of claims 4 to 5, wherein the side wall of the chute is provided with an adjusting window, and a second adjusting member is extended outwards; the detection piece is arranged in the adjusting window and connected with the second adjusting piece so as to drive the detection piece to move up and down in the adjusting window by changing the position of the second adjusting piece.

7. The backpack fire extinguisher of claim 1, wherein the backpack frame further comprises a mounting plate and a spray gun, the mounting plate is disposed below the inflatable back plate and is provided with an interface, and the spray gun is communicated with the outlet of the fire extinguisher body through the interface.

8. The backpack fire extinguisher of claim 7, wherein a fixing member is provided to a side of the gas-filled back plate, the fixing member being capable of bayonet coupling with the spray gun to fix the spray gun.

9. The backpack fire extinguisher of claim 1, wherein side edges of the inflatable back plate extend outward with a waist guard.

10. A backpack fire extinguisher as claimed in claim 9, wherein said alarm means includes a flashing light and a buzzer to emit light and sound when said alarm means is activated.