CN112443876A - Multifunctional range hood capable of automatically washing oil smoke - Google Patents

Abstract

The invention discloses a multifunctional smoke exhaust ventilator capable of automatically washing oil smoke, which comprises a machine body, wherein a main motor is arranged in the machine body, the lower end of the main motor is communicated with a motor belt cavity, the lower side of the motor belt cavity is provided with a main cavity, the lower side of the main cavity is communicated with an oil smoke inlet cavity with a downward opening, and a motor connecting frame is fixedly connected to the top wall of the main cavity. The practicability of the device is improved.

Description

Multifunctional range hood capable of automatically washing oil smoke

Technical Field

The invention relates to the field of range hoods, in particular to a multifunctional range hood capable of automatically washing oil smoke.

Background

Often can produce a large amount of oil fumes when doing the dish, need timely clearance oil smoke, otherwise harmful to the human body, but current range hood is fan at fixed position mostly, leads to the oil smoke to pile up in same position easily, influences the life of equipment to can not self-cleaning filter, lead to equipment just need to go artifical the washing very fast, give people the use and brought very big inconvenience, this problem has effectively been solved to this equipment.

Disclosure of Invention

The invention aims to provide a multifunctional range hood capable of automatically washing oil smoke, which is used for overcoming the defects in the prior art.

The technical scheme adopted by the invention for solving the technical problems is as follows: the multifunctional range hood capable of automatically washing and brushing oil smoke comprises a machine body, wherein a main motor is arranged in the machine body, the lower end of the main motor is communicated with a motor belt cavity, a main cavity is arranged on the lower side of the motor belt cavity, an oil smoke inlet cavity with a downward opening is communicated with the lower side of the main cavity, a motor connecting frame is fixedly connected to the top wall of the main cavity, a motor connecting cavity is arranged in the motor connecting frame, the lower end of the main motor is in power connection with a motor shaft which penetrates through the motor belt cavity and is rotatably connected to the bottom wall of the motor connecting cavity, a movable threaded sleeve is slidably connected to the top wall of the main cavity, a fan motor is arranged in the movable threaded sleeve, the lower end of the fan motor is in power connection with a fan motor shaft extending out of the movable threaded sleeve, the lower end of the fan motor shaft is fixedly connected with a fan for absorbing the oil smoke, and, the oil smoke pipeline lower extreme fixedly connected with is used for filtering the filter of oil and cigarette, and the cigarette can pass through the filter filters and passes through the oil smoke pipeline is discharged, thereby oil then by the filter filters and stays the owner intracavity, motor hookup intracavity is equipped with and is used for making remove the mobile device that the thread bush removed about, the mobile device right side is equipped with and is used for giving the filter lower extreme carries out abluent belt cleaning device, the belt cleaning device right side is equipped with and is used for detecting whether the filter blocks up detection device, the detection device rear side is equipped with and is used for working as alarm device who carries out alarm processing when the filter blocks up.

Further, the moving device comprises a motor spline housing which is positioned in the motor connecting cavity and is connected with the motor shaft through a spline, a motor spline plate which is connected with the motor connecting cavity in a sliding manner is connected on the motor spline housing in a rotating manner, motor connecting wheels which are symmetrical in vertical position are fixedly connected on the motor spline housing, electromagnetic trigger blocks which are symmetrical in horizontal position are fixedly connected on the top wall of the main cavity, a moving fixing frame is fixedly connected on the top wall of the main cavity, electromagnets which can control the movement of the motor spline plate and are controlled by the electromagnetic trigger blocks are fixedly connected on the top wall of the motor connecting cavity, a moving bevel gear can be meshed and connected at the right end of the motor connecting wheel, a moving threaded shaft which penetrates through the right end of the motor connecting frame and the moving threaded housing and is connected to the left end of the moving, and the movable threaded shaft and the movable threaded sleeve are in threaded connection, namely, when the movable threaded shaft rotates, the movable threaded sleeve can move left and right.

Furthermore, the cleaning device comprises motor belt pulleys which are arranged at the left and right positions and fixedly connected to the motor shaft in the motor belt cavity, a motor belt is connected between the motor belt pulleys in a chain manner, a cleaning bevel wheel cavity is arranged at the lower side of the motor belt cavity, the middle part of the motor belt pulley is fixedly connected with a cleaning bevel wheel shaft, the upper end of the cleaning bevel wheel shaft is rotatably connected to the top wall of the motor belt cavity, the lower end of the cleaning bevel wheel shaft penetrates through the bottom wall of the motor belt cavity, the lower end of the cleaning bevel wheel shaft is fixedly connected with a first cleaning wheel, the front end of the first cleaning wheel is engaged and connected with a second cleaning wheel, the front end of the second cleaning wheel is fixedly connected with a cleaning shaft, the cleaning shaft penetrates through the front wall of the cleaning bevel wheel cavity and extends into the main cavity, the front end of the cleaning shaft is slidably connected with a cleaning frame, and, be equipped with the washing chamber in the wash rack, the washing rack of position symmetry about fixedly connected with on the upper and lower wall of washing chamber, wash a right-hand member fixedly connected with washing wheel, wash on the wheel fixedly connected with can mesh connect in wash the washing teeth of a cogwheel of rack, work as when wasing the axle and rotating the wash rack can remove, wash rack upper end fixedly connected with washing pole, wash pole upper end fixedly connected with washing board, wash board upper end fixedly connected with and be used for wasing the brush that washes of the left and right positions range of filter, it is equipped with sliding connection in the frame is collected to the oil smoke that is used for holding the filtration oil smoke in the main cavity right wall to wash the mount downside.

Further, the detection device comprises a pressure cavity arranged on the right side of the main cavity, a pressure piston is slidably connected in the pressure cavity, a pressure spring is fixedly connected between the left end of the pressure piston and the left wall of the pressure cavity, the left end of the pressure piston is fixedly connected with a pressure rod which penetrates through the left wall of the pressure cavity and extends into the main cavity, the left end of the pressure rod is fixedly connected with a pressure plate which can detect the pressure in the main cavity, when the filter plate is blocked, the main cavity becomes larger, so that the pressure plate moves to the right, the upper side of the pressure cavity is communicated with a pressure air cavity, the lower side of the motor belt cavity is provided with an alarm cone pulley cavity, the upper end of the right side of the motor belt pulley is fixedly connected with an alarm cone pulley shaft, the upper end of the alarm cone pulley shaft is rotatably connected to the top wall of the motor, the lower end of the alarm cone pulley shaft is fixedly connected with a first alarm wheel, the front end of the first alarm wheel can be meshed with a second alarm wheel, an alarm cavity is arranged at the front side of the alarm cone pulley cavity, an alarm spline housing is fixedly connected at the front end of the second alarm pulley, an alarm spline shaft which penetrates through the front wall of the alarm cone pulley cavity and is rotationally connected to the front wall of the alarm cavity is connected with an inner spline of the alarm spline housing, the alarm spline housing is rotationally connected with an alarm spline plate which is connected in the alarm cone pulley cavity in a sliding way, a detection spring is fixedly connected between the front end of the alarm spline plate and the front wall of the alarm cone pulley cavity, an alarm piston cavity communicated with the pressure air cavity is arranged at the front side of the alarm cone pulley cavity, an alarm piston rod penetrating through the front wall of the alarm cone pulley cavity and extending into the alarm piston cavity is fixedly connected at the front end of the alarm spline plate, and an alarm plug spring is fixedly connected between the rear end of the alarm piston and the rear wall of the alarm piston cavity.

Furthermore, the alarm device comprises an alarm wheel which is positioned in the alarm cavity and fixedly connected to the alarm spline shaft, the alarm wheel is fixedly connected with an alarm rod which is symmetrical in vertical position, the upper wall and the lower wall of the alarm cavity are fixedly connected with alarm frames which are symmetrical in vertical position, the alarm frames are connected with alarm blocks which are symmetrical in vertical position and can be impacted by the alarm rod to send signals in a sliding mode, and alarm springs which are symmetrical in vertical position are fixedly connected between the lower end of each alarm block and the bottom wall of the alarm cavity.

The invention has the beneficial effects that: the multifunctional range hood capable of automatically washing the oil smoke provided by the invention can realize the left and right movement of the fan, so that the oil smoke accumulation caused by the oil smoke absorption at one position is avoided, the filter plate can be automatically cleaned by the multifunctional range hood, the problem that the filter plate is easy to block is avoided, when the filter plate is blocked or the filtering effect is poor, the multifunctional range hood can timely send a prompt to a user, the multifunctional range hood is simple in structure and convenient to operate, the full-automatic operation is realized, the working procedures are mutually matched and do not influence each other, and the practicability of the device is improved.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings without creative efforts.

FIG. 1 is a schematic view of the overall structure of a multifunctional range hood of the present invention capable of automatically washing oil smoke;

FIG. 2 is a schematic view of the structure in the direction A-A in FIG. 1;

FIG. 3 is a schematic view of the structure in the direction B-B in FIG. 1;

fig. 4 is a schematic view of the structure in the direction C-C in fig. 2.

Detailed Description

The invention will now be described in detail with reference to fig. 1-4, for convenience of description, the following orientations will now be defined: the up, down, left, right, and front-back directions described below correspond to the up, down, left, right, and front-back directions in the projection relationship of fig. 1 itself.

Referring to the accompanying drawings 1-4, a multifunctional range hood capable of automatically washing and brushing oil smoke comprises a body 11, a main motor 12 is arranged in the body 11, the lower end of the main motor 12 is communicated with a motor belt cavity 13, a main cavity 17 is arranged on the lower side of the motor belt cavity 13, the lower side of the main cavity 17 is communicated with an oil smoke inlet cavity 18 with a downward opening, a motor connecting frame 19 is fixedly connected to the top wall of the main cavity 17, a motor connecting cavity 20 is arranged in the motor connecting frame 19, the lower end of the main motor 12 is in power connection with a motor shaft 16 which penetrates through the motor belt cavity 13 and is rotatably connected to the bottom wall of the motor connecting cavity 20, a movable threaded sleeve 26 is slidably connected to the top wall of the main cavity 17, a fan motor 27 is arranged in the movable threaded sleeve 26, and the lower end of the fan motor 27 is in power connection with a fan motor, the lower end of the fan motor shaft 28 is fixedly connected with a fan 29 for absorbing oil smoke, the top wall of the main cavity 17 is fixedly connected with an oil smoke pipeline 33 for discharging the oil smoke, the lower end of the oil smoke pipeline 33 is fixedly connected with a filter plate 35 for filtering oil and smoke, the smoke can be filtered by the filter plate 35 and discharged through the oil smoke pipeline 33, the oil is filtered by the filter plate 35 and is remained in the main cavity 17, a moving device 102 for enabling the moving threaded sleeve 26 to move left and right is arranged in the motor connecting cavity 20, a cleaning device 101 for cleaning the lower end of the filter plate 35 is provided at the right side of the moving device 102, a detection device 103 for detecting whether the filter plate 35 is blocked is arranged at the right side of the cleaning device 101, and an alarm device 104 for performing alarm processing when the filter plate 35 is blocked is arranged at the rear side of the detection device 103.

Advantageously, the moving device 102 includes a motor spline housing 23 splined on the motor shaft 16 inside the motor coupling cavity 20, a motor spline plate 21 slidably connected inside the motor coupling cavity 20 is rotatably connected to the motor spline housing 23, a motor coupling wheel 22 vertically symmetrical is fixedly connected to the motor spline housing 23, an electromagnetic trigger block 31 horizontally symmetrical is fixedly connected to the top wall of the main cavity 17, a moving fixed frame 30 is fixedly connected to the top wall of the main cavity 17, an electromagnet 32 capable of controlling the movement of the motor spline plate 21 and controlled by the electromagnetic trigger block 31 is fixedly connected to the top wall of the motor coupling cavity 20, a moving bevel gear 24 is capable of being engaged and connected to the right end of the motor coupling wheel 22, a moving threaded shaft 25 penetrating through the right end of the motor coupling frame 19 and the moving threaded housing 26 and rotatably connected to the left end of the moving fixed frame 30 is fixedly connected to the right end of the moving bevel gear 24, and the movable threaded shaft 25 and the movable threaded sleeve 26 are in threaded connection, namely when the movable threaded shaft 25 rotates, the movable threaded sleeve 26 can move left and right.

Beneficially, the cleaning device 101 includes motor belt pulleys 15 arranged at left and right positions and fixedly connected to the motor shaft 16 in the motor belt cavity 13, a motor belt 14 is connected between the motor belt pulleys 15 in a chain manner, a cleaning bevel wheel cavity 48 is arranged at the lower side of the motor belt cavity 13, a cleaning bevel wheel shaft 47 is fixedly connected to the middle motor belt pulley 15, the upper end of the cleaning bevel wheel shaft 47 is rotatably connected to the top wall of the motor belt cavity 13, the lower end of the cleaning bevel wheel shaft 47 penetrates through the bottom wall of the motor belt cavity 13 and extends into the cleaning bevel wheel cavity 48, a first cleaning wheel 49 is fixedly connected to the lower end of the cleaning bevel wheel shaft 47, a second cleaning wheel 50 is connected to the front end of the first cleaning wheel 49 in a meshing manner, a cleaning shaft 51 penetrates through the front wall of the cleaning bevel wheel cavity 48 and extends into the main cavity 17, a cleaning frame 56 is slidably connected to the front end of the cleaning shaft, a cleaning fixing frame 39 which is connected with the lower end of the cleaning frame 56 in a sliding way is fixedly connected on the right wall of the main cavity 17, a cleaning cavity 53 is arranged in the cleaning frame 56, the upper wall and the lower wall of the cleaning cavity 53 are fixedly connected with cleaning racks 54 which are symmetrical up and down, a cleaning wheel 52 is fixedly connected at the right end of the cleaning shaft 51, a cleaning wheel tooth 55 capable of being meshed and connected with the cleaning rack 54 is fixedly connected on the cleaning wheel 52, when the cleaning shaft 51 rotates, the cleaning frame 56 can move left and right, the upper end of the cleaning frame 56 is fixedly connected with the cleaning rod 38, the upper end of the washing rod 38 is fixedly connected with a washing plate 36, the upper end of the washing plate 36 is fixedly connected with washing brushes 37 which are used for washing the left and right positions of the filter plate 35, the lower side of the cleaning fixing frame 39 is provided with an oil smoke collecting frame 40 which is connected with the right wall of the main cavity 17 in a sliding manner and is used for containing and filtering oil smoke.

Advantageously, the detecting device 103 includes a pressure chamber 43 disposed on the right side of the main chamber 17, a pressure piston 45 is slidably connected in the pressure chamber 43, a pressure spring 44 is fixedly connected between the left end of the pressure piston 45 and the left wall of the pressure chamber 43, the left end of the pressure piston 45 is fixedly connected with a pressure rod 42 penetrating through the left wall of the pressure chamber 43 and extending into the main chamber 17, the left end of the pressure rod 42 is fixedly connected with a pressure plate 41 capable of detecting the pressure in the main chamber 17, when the filter plate 35 is blocked, the main chamber 17 becomes larger, so that the pressure plate 41 moves to the right, the upper side of the pressure chamber 43 is communicated with a pressure air chamber 46, the lower side of the motor belt chamber 13 is provided with an alarm cone chamber 58, the right side of the motor pulley 15 is fixedly connected with an alarm cone shaft 57 having an upper end rotatably connected to the top wall of the motor belt chamber 13 and a lower end penetrating through the bottom wall of the motor belt chamber 13 and extending, the lower end of the alarm cone wheel shaft 57 is fixedly connected with a first alarm wheel 59, the front end of the first alarm wheel 59 can be engaged and connected with a second alarm wheel 60, the front side of the alarm cone wheel cavity 58 is provided with an alarm cavity 70, the front end of the second alarm wheel 60 is fixedly connected with an alarm spline housing 61, the inner spline of the alarm spline housing 61 is connected with an alarm spline shaft 62 which penetrates through the front wall of the alarm cone wheel cavity 58 and is rotatably connected to the front wall of the alarm cavity 70, the alarm spline housing 61 is rotatably connected with an alarm spline plate 63 which is slidably connected in the alarm cone wheel cavity 58, a detection spring 68 is fixedly connected between the front end of the alarm spline plate 63 and the front wall of the alarm cone wheel cavity 58, the front side of the alarm cone wheel cavity 58 is provided with an alarm piston cavity 65 which is communicated with the pressure air cavity 46, the front end of the alarm spline plate 63 is fixedly connected with an alarm piston rod 64 which penetrates through the alarm cone wheel cavity 58 and extends into the alarm piston cavity 65, an alarm plug spring 67 is fixedly connected between the rear end of the alarm piston 66 and the rear wall of the alarm piston cavity 65.

Beneficially, the alarm device 104 includes an alarm wheel 69 located in the alarm cavity 70 and fixedly connected to the alarm spline shaft 62, an alarm rod 71 with symmetrical up and down positions is fixedly connected to the alarm wheel 69, an alarm frame 73 with symmetrical up and down positions is fixedly connected to the upper and lower walls of the alarm cavity 70, an alarm block 72 with symmetrical up and down positions and capable of being impacted by the alarm rod 71 to send a signal is slidably connected to the alarm frame 73, and an alarm spring 74 with symmetrical up and down positions is fixedly connected between the lower end of the alarm block 72 and the bottom wall of the alarm cavity 70.

Sequence of mechanical actions of the whole device: when the device is operated, the main motor 12 is started, so that the main motor 12 drives the motor shaft 16 to rotate, so that the motor shaft 16 drives the motor spline housing 23 to rotate, the left electromagnetic trigger block 31 is started to control the electromagnet 32 to move the motor spline plate 21 upwards, namely, the lower motor coupling wheel 22 is meshed with the movable bevel gear 24, so that the motor coupling wheel 22 drives the movable bevel gear 24 to rotate, so that the movable threaded shaft 25 rotates to drive the movable threaded housing 26 to move right, when the right electromagnetic trigger block 31 is triggered by the movable threaded housing 26, the electromagnet 32 moves the motor spline plate 21 downwards to be meshed with the movable bevel gear 24 and the upper motor coupling wheel 22, so that the movable threaded shaft 25 rotates to drive the movable threaded housing 26 to move left, so that the movable threaded housing 26 reciprocates left and right, the oil smoke is efficiently sucked in the oil smoke inlet cavity 18, meanwhile, the motor belt pulley 15 in the middle part drives the cleaning bevel wheel shaft 47 to rotate, so that the first cleaning wheel 49 drives the second cleaning wheel 50 to rotate, so that the cleaning shaft 51 drives the cleaning wheel 52 to rotate, so that the cleaning wheel teeth 55 and the cleaning rack 54 are intermittently meshed and connected, so that the cleaning frame 56 moves leftwards and rightwards, the cleaning rod 38 drives the cleaning plate 36 to move leftwards and rightwards, so that the cleaning brush 37 cleans the lower end of the filter plate 35 leftwards and rightwards, so that the smoke can enter the oil smoke pipeline 33 through the filter plate 35 to be discharged, the oil smoke falls into the oil smoke collecting frame 40, and after the filter plate 35 is blocked, the oil smoke in the main cavity 17 cannot be discharged, and the pressure in the main cavity 17 is increased, the pressure plate 41 moves to the right so that the gas in the pressure chamber 43 is pressed into the alarm piston chamber 65 through the pressure gas chamber 46, so that the alarm piston 66 moves backward, so that the alarm piston rod 64 drives the alarm spline plate 63 to move backward, so that the second alarm wheel 60 and the first alarm wheel 59 are engaged, so that the first alarm wheel 59 drives the second alarm wheel 60 to rotate, so that the alarm spline housing 61 drives the alarm spline shaft 62 to rotate, so that the alarm wheel 69 drives the alarm rod 71 to rotate, so that the alarm rod 71 hits the alarm block 72 to generate an alarm sound, thereby alerting the user to perform the operation of the apparatus.

The above-mentioned embodiments are merely illustrative of the technical concept and features of the present invention, and the purpose thereof is to enable those skilled in the art to understand the present invention and implement the present invention, and not to limit the scope of the present invention, and all equivalent changes or modifications made according to the spirit of the present invention should be covered by the scope of the present invention.

Claims (5)

1. The utility model provides a can scrub multi-functional smoke ventilator of oil smoke automatically, includes the fuselage, its characterized in that: the kitchen ventilator is characterized in that a main motor is arranged in the ventilator body, the lower end of the main motor is communicated with a motor belt cavity, a main cavity is arranged on the lower side of the motor belt cavity, the lower side of the main cavity is communicated with a lampblack inlet cavity with a downward opening, a motor connecting frame is fixedly connected to the top wall of the main cavity, a motor connecting cavity is arranged in the motor connecting frame, the lower end of the main motor is in power connection with a motor shaft which penetrates through the motor belt cavity and is rotatably connected to the bottom wall of the motor connecting cavity, a movable threaded sleeve is slidably connected to the top wall of the main cavity, a fan motor is arranged in the movable threaded sleeve, the lower end of the fan motor is in power connection with a fan motor shaft extending out of the movable threaded sleeve, the lower end of the fan motor shaft is fixedly connected with a fan for absorbing lampblack, an lampblack discharging oil smoke pipeline is fixedly connected to, the cigarette can pass through the filter filters and passes through the oil smoke pipeline is discharged, thereby oil then by the filter filters and stays main intracavity, motor hookup intracavity is equipped with and is used for making remove the mobile device that the thread bush removed, the mobile device right side is equipped with and is used for giving the filter lower extreme carries out abluent belt cleaning device, the belt cleaning device right side is equipped with and is used for detecting whether the filter blocks up detection device, the detection device rear side is equipped with and is used for working as carry out alarm device that the warning was handled when the filter blockked up.

2. The multifunctional range hood capable of automatically brushing oil smoke according to claim 1, is characterized in that: the moving device comprises a motor spline sleeve which is positioned in the motor connecting cavity and is in spline connection with the motor shaft, a motor spline plate which is in sliding connection with the motor connecting cavity is rotationally connected on the motor spline sleeve, a motor connecting wheel which is symmetrical in vertical position is fixedly connected on the motor spline sleeve, an electromagnetic trigger block which is symmetrical in horizontal position is fixedly connected on the top wall of the main cavity, a moving fixing frame is fixedly connected on the top wall of the main cavity, an electromagnet which can control the movement of the motor spline plate and is controlled by the electromagnetic trigger block is fixedly connected on the top wall of the motor connecting cavity, a moving bevel gear can be meshed and connected at the right end of the motor connecting wheel, and a moving threaded shaft which penetrates through the right end of the motor connecting frame and the moving threaded sleeve and is rotationally connected at the left end of the, and the movable threaded shaft and the movable threaded sleeve are in threaded connection, namely, when the movable threaded shaft rotates, the movable threaded sleeve can move left and right.

3. The multifunctional range hood capable of automatically brushing oil smoke according to claim 1, is characterized in that: the cleaning device comprises motor belt pulleys which are arranged at the left and right positions and are fixedly connected to the motor shaft in the motor belt cavity, a motor belt is connected between the motor belt pulleys in a chain manner, a cleaning cone pulley cavity is arranged at the lower side of the motor belt cavity, the middle part of the motor belt pulley is fixedly connected with a cleaning cone pulley shaft, the upper end of the cleaning cone pulley shaft is rotatably connected to the top wall of the motor belt cavity, the lower end of the cleaning cone pulley shaft penetrates through the bottom wall of the motor belt cavity and extends into the cleaning cone pulley cavity, the lower end of the cleaning cone pulley shaft is fixedly connected with a first cleaning wheel, the front end of the first cleaning wheel is connected with a second cleaning wheel in a meshing manner, the front end of the second cleaning wheel is fixedly connected with a cleaning shaft, the cleaning shaft penetrates through the front wall of the cleaning cone pulley cavity and extends into the main cavity, the front end, be equipped with the washing chamber in the wash rack, the washing rack of position symmetry about fixedly connected with on the upper and lower wall of washing chamber, wash a right-hand member fixedly connected with washing wheel, wash on the wheel fixedly connected with can mesh connect in wash the washing teeth of a cogwheel of rack, work as when wasing the axle and rotating the wash rack can remove, wash rack upper end fixedly connected with washing pole, wash pole upper end fixedly connected with washing board, wash board upper end fixedly connected with and be used for wasing the brush that washes of the left and right positions range of filter, it is equipped with sliding connection in the frame is collected to the oil smoke that is used for holding the filtration oil smoke in the main cavity right wall to wash the mount downside.

4. The multifunctional range hood capable of automatically brushing oil smoke according to claim 1, is characterized in that: the detection device comprises a pressure cavity arranged on the right side of the main cavity, a pressure piston is connected in the pressure cavity in a sliding manner, a pressure spring is fixedly connected between the left end of the pressure piston and the left wall of the pressure cavity, the left end of the pressure piston is fixedly connected with a pressure rod which penetrates through the left wall of the pressure cavity and extends into the main cavity, the left end of the pressure rod is fixedly connected with a pressure plate which can detect the air pressure in the main cavity, when the pressure plate is blocked, the main cavity becomes larger, so that the pressure plate moves to the right, the upper side of the pressure cavity is communicated with a pressure air cavity, the lower side of the motor belt cavity is provided with an alarm cone wheel cavity, the upper end of the motor belt wheel is fixedly connected to the top wall of the motor belt cavity, the lower end of the motor belt wheel penetrates through the bottom wall of the motor belt cavity and extends into the alarm cone wheel cavity, and, the front end of the first alarm wheel can be engaged and connected with a second alarm wheel, the front side of the alarm cone wheel cavity is provided with an alarm cavity, the front end of the second warning wheel is fixedly connected with a warning spline housing, the inner spline of the warning spline housing is connected with a warning spline shaft which penetrates through the front wall of the warning cone pulley cavity and is rotationally connected to the front wall of the warning cavity, the alarm spline housing is rotationally connected with an alarm spline plate which is connected in the alarm cone pulley cavity in a sliding way, a detection spring is fixedly connected between the front end of the alarm spline plate and the front wall of the alarm cone pulley cavity, an alarm piston cavity communicated with the pressure air cavity is arranged at the front side of the alarm cone pulley cavity, an alarm piston rod penetrating through the front wall of the alarm cone pulley cavity and extending into the alarm piston cavity is fixedly connected at the front end of the alarm spline plate, and an alarm plug spring is fixedly connected between the rear end of the alarm piston and the rear wall of the alarm piston cavity.

5. The multifunctional range hood capable of automatically brushing oil smoke according to claim 1, is characterized in that: the alarm device comprises an alarm wheel which is positioned in the alarm cavity and fixedly connected to the alarm spline shaft, the alarm wheel is fixedly connected with an alarm rod which is symmetrical in vertical position, the upper wall and the lower wall of the alarm cavity are fixedly connected with alarm frames which are symmetrical in vertical position, the alarm frames are connected with alarm blocks which are symmetrical in vertical position and can be impacted by the alarm rod to send signals, and the lower end of each alarm block and an alarm spring which is symmetrical in vertical position and is fixedly connected between the bottom walls of the alarm cavities are connected in a sliding mode.

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