CN218247043U

CN218247043U - Hand dryer capable of generating heat by utilizing work of components and parts to realize hot air

Info

Publication number: CN218247043U
Application number: CN202222403477.7U
Authority: CN
Inventors: 肖鲲
Original assignee: Guangdong Roman Technology Co Ltd
Current assignee: Guangdong Roman Technology Co Ltd
Priority date: 2022-09-09
Filing date: 2022-09-09
Publication date: 2023-01-10
Anticipated expiration: 2032-09-09

Abstract

The utility model relates to an utilize components and parts work production heat to realize hot-blast hand dryer, the load simulator comprises a case, machine case both sides be equipped with the hole of induced drafting, machine case front end be equipped with the wind cavity pipe, the wind cavity pipe is corresponding with the air outlet of shell, the machine case have a cavity, the cavity pass through the baffle and separate out and gather wind cavity and wind cavity, it is equipped with the air intake to gather between wind cavity and wind cavity, the front end in wind cavity is equipped with the air outlet, is equipped with centrifugal double-layer wall fan in the wind cavity, centrifugal double-layer wall fan locate brushless motor's rear end and be located air intake department, MOS pipe welding is in on the double-layer PCBA board, electric capacity locate motor one side and with double-layer PCBA board electric connection, double-layer PCBA board integration is at brushless motor front end and be located air outlet department, the high heat that quick components and parts produced effectively dispels the heat to the components and parts in the wind cavity and the air that forms because of dispelling the heat is utilized in hand portion drying once more.

Description

Hand dryer capable of generating heat by utilizing work of components and parts to realize hot air

Technical Field

The utility model relates to a hand dryer technical field indicates especially one kind and utilizes components and parts work to produce the hot-blast hand dryer of heat realization.

Background

The hand drier is an electric appliance used for drying hands in a bathroom and is commonly used in hotels, restaurants, hospitals, public entertainment places and the like. Hand dryers generally mainly include a heating type and a high-speed air drying type. Among them, in the prior art, the heating type hand dryer needs a separate heating element to realize the heating function, for example, the patent publication No. CN112914405A, the patent name is hand dryer, the patent publication No. CN106175547A, the patent name is hand dryer, all depend on the heating component to realize the heating function.

Because hand dryer can produce high heat at the operation in-process, especially MOS pipe and the heat that the electric capacity produced are great, and the MOS pipe is installed at the fin at present, and installs the fin at hand dryer's air inlet end to realize MOS pipe heat dissipation, because air inlet end department installation part is more, can lead to the wind speed of air inlet slow, drying efficiency is low.

SUMMERY OF THE UTILITY MODEL

In order to solve the problem, the utility model provides an utilize components and parts work to produce heat and realize hot-blast hand dryer, the heat that negative pressure inspiratory air produced to components and parts during operation is taken away, and this components and parts heat the inspiratory air heating of negative pressure as the heat source simultaneously, both can discharge the heat that components and parts produced in the hand dryer fast, realize the function of hand dryer hot air simultaneously.

In order to achieve the above object, the utility model adopts the following technical scheme: the utility model provides an utilize components and parts work production heat to realize hot-blast hand dryer, includes quick-witted case, machine case both sides be equipped with the hole of induced drafting, machine case front end be equipped with the wind cavity pipe, the wind cavity pipe is corresponding with the air outlet nozzle of shell, machine case the cavity have a cavity, the cavity pass through the baffle and separate out and gather wind cavity and wind cavity, it is equipped with the air intake to gather between wind cavity and the wind cavity, the front end in wind cavity is equipped with the air outlet with wind cavity pipe intercommunication, forms the route of circulation of air between air intake and air outlet, is equipped with centrifugal double-layer wall fan of folding fan in the wind cavity, centrifugal double-layer wall fan of folding fan including connecting gradually and being located centrifugal double-layer fan blade, brushless motor, MOS pipe, double-layer fan and locate brushless motor's rear end and be located air inlet department, MOS pipe welding is in on the double-layer PCBA board, the electric capacity locate brushless motor one side and be connected with double-layer PCBA board electric property, double-layer PCBA board integration is located brushless motor front end and is located air outlet department.

The double-layer PCBA board, the MOS tubes and the capacitor for driving the brushless motor can generate high-temperature heat when running, the high temperature can damage components on the double-layer PCBA board, so that the components in the hand dryer must be subjected to heat dissipation treatment, the double-layer PCBA board, the MOS tubes and the capacitor for driving the brushless motor are completely wrapped in the air cavity, the centrifugal double-layer fan blades are arranged at the air inlet and used for introducing air in the air collecting cavity into the air cavity, no excessive components are arranged at the air inlet, the air speed of the inlet air is high, the centrifugal double-layer fan blades are used for inducing the air, the speed of the inlet air is higher, the brushless motor runs, high negative pressure is formed in the air cavity, the air sucked from the outside is sprayed out by high-pressure high-speed wind power, the process completely covers the double-layer PCBA board, the MOS tubes and the capacitor, the heat dissipation effect is very good, the traditional MOS tubes are located at the air inlet end, heat dissipation of the air can be lost on the air circulation path of the air, and the heat energy generated by all electronic components on the circulation path of the air is sprayed out from the air outlet, and the heat nozzle is maximized.

Preferably, the double-layer PCBA board is provided with first heat dissipation holes.

Preferably, the axial direction of the capacitor coincides with the axial direction of the brushless motor.

Preferably, the cross-sectional area of the air inlet is smaller than that of the air cavity.

Preferably, the rear end of the centrifugal double-laminated-wall fan is provided with a motor damping washer.

Preferably, the case comprises a shell which is through from front to back, the shell is provided with a first opening and a second opening, the first opening is provided with a back cover, the second opening is provided with a front cover, the air gathering cavity is located in the back cover, the air outlet is located in the front cover, and the air outlet is connected with the air duct cavity.

Preferably, centrifugal double-folded-wall fan still include motor end cover and inner cup, the motor end cover on be equipped with the second louvre, double-deck PCBA board encapsulate in the motor end cover, the inner cup lid close at the second opening part and with the motor end cover spacing in the second opening part, be equipped with the sealing washer between inner cup and the second opening, the protecgulum locate the inner cup top.

Preferably, the motor end cover is provided with a positioning bulge, the inner cover is attached with a motor flat gasket, a positioning groove is formed in the surface of the motor flat gasket, and the motor end cover and the inner cover are matched and positioned through the positioning groove and the positioning bulge.

Preferably, a power supply main board is arranged on the side face of the case, and the power supply main board is electrically connected with the double-layer PCBA board.

Preferably, two sides of the case are respectively provided with a filtering component.

The beneficial effects of the utility model reside in that: the utility model discloses it is located the air intake to double-fold fan blade of centrifugal type, will be because of the during operation produces thermal components and parts sets up on the route of circulation of air, and concentrate on the air outlet, the heat that utilizes the components and parts during operation to produce heats the air of entering the wind cavity as the heat source, can need not use resistance wire or other components and parts that generate heat for the heating, through the overall arrangement of configuration optimization and part, in the time of can reaching better radiating effect, the high-speed heat that blows off of high pressure is approximately discharged from the wind cavity pipe harmlessly, it dries to provide hot-blast in other words automatically, thereby replaced the built-in heating element of traditional hand dryer, the overall structure of hand dryer has been simplified.

Drawings

Fig. 1 is a perspective view of the present invention.

Fig. 2 is a schematic diagram of the explosion structure of the present invention.

Fig. 3 is a schematic structural diagram of the arrangement of the middle brushless motor and the double-layer PCBA board in the air cavity.

Fig. 4 is a structural diagram of the case of the present invention.

Fig. 5 is another view of the casing structure of the present invention.

Fig. 6 is the utility model discloses a motor shock attenuation packing ring, brushless motor, MOS pipe, double-deck PCBA board, motor end cover assembly drawing.

Fig. 7 is a schematic perspective view of the motor end cover of the present invention.

Fig. 8 is a schematic perspective view of the motor flat gasket of the present invention.

Fig. 9 is a schematic perspective view of the wind chamber tube of the present invention.

Fig. 10 is a schematic perspective view of the housing of the present invention.

Fig. 11 is an enlarged view at a of fig. 10.

Fig. 12 is a schematic structural view of a centrifugal double-stacked-wall fan according to the present invention.

Fig. 13 is a sectional view of the centrifugal double-stacked-wall fan according to the present invention.

Description of reference numerals: 100 cases; 110 a first opening; 120 a second opening; 130 air chambers; 131 air inlet; 132 air outlet; 140 a cavity; 150 second air suction holes; 160 a separator plate; 200 centrifugal double-stacked-wall fan blades; 210 a brushless motor; 220 double-layer PCBA board; 221. a first heat dissipation hole; 230MOS tube; 240 motor end caps; 241 positioning projection; 242 second louvers; 250 motor damping washer; 260 power supply main board; 270 centrifugal double-stack fan blades; 280. a capacitor; 300 an inner cover; 310 motor flat gaskets; 311 a positioning groove; 320 a seal ring; 400 a front cover; 500 wind chamber pipes; 510 a fluid outlet; 600 rear cover; 610 air suction holes; 700 left filter element; 800 right filter element; 900 outer shell; 910 an air outlet nozzle; 911 air inlet.

Detailed Description

Referring to fig. 1-13, the present invention relates to a hand dryer capable of generating heat by using components, which includes a case 100, wherein an air cavity tube 500 is disposed at the front end of the case 100, a left filter assembly 700 and a right filter assembly 800 are disposed on two sides of the case 100, a housing 900 is disposed outside the case 100, the housing 900 is used for accommodating all components (the case 100 and the air cavity tube 500, etc.), air inlets 911 are designed on two sides of the housing 900, an air outlet 910 is disposed at the bottom end of the housing 900, and the air outlet 910 corresponds to the fluid outlet 510 of the air cavity tube 500. Air enters the case 100 through the air inlet 911 and is then ejected out through the air cavity pipe 500 and the air outlet 910 in sequence.

The case 100 is provided with a cavity 140 which is through from front to back, the rear end of the cavity 140 is provided with a first opening 110, the front end of the cavity 140 is provided with a second opening 120, the first opening 110 is sealed by a rear cover 600, the second opening 120 is sealed by a front cover 400, the cavity 140 is internally provided with a partition plate 160, the cavity 140 is divided into a wind gathering cavity (not shown) and a wind cavity 130 by the partition plate 160, the inner wall of the case 100 and the rear cover 600 enclose the wind gathering cavity, the partition plate 160, the inner wall of the case 100 and the front cover 400 enclose the wind gathering cavity 130, two side surfaces of the rear cover 600 are respectively provided with a plurality of air suction holes 610, the air suction holes 610 are used for sucking air outside the case 100 into the wind gathering cavity, the partition plate 160 is provided with an air inlet 131 of the wind cavity 130, so that two sides of the case 100 enter the wind gathering cavity and air is discharged from the top of the wind gathering cavity (the air inlet 131) to form airflow of double-side top-inlet air-outlet, the airflow enters the air cavity 130 through the air inlet 131, the air intake is large and the air speed is high through the structure, the air outlet 132 of the air cavity 130 is arranged on the front cover 400, the second opening 120 can be the air outlet 132 directly in the structural design, the air outlet 132 of the air cavity 130 in the embodiment is arranged at the top of the front cover 400, an air circulation path is formed between the air inlet 131 and the air outlet 132 of the air cavity 130, an air cavity pipe 500 communicated with the air outlet 132 is arranged at the air outlet 132, a centrifugal double-stacked-wall fan 200 integrated with a driving module is arranged in the air cavity 130, the centrifugal double-stacked-wall fan 200 comprises a centrifugal double-stacked fan blade 270, a brushless motor 210, a capacitor 280, a MOS (metal oxide semiconductor) pipe 230, a double-layer PCBA (printed circuit board) 220 and a motor end cover 240 from the air inlet 131 to the air outlet 132, and the centrifugal double-stacked fan blade 270, the brushless motor 210, the double-layer PCBA 220 and the motor end cover 240 are arranged on the centrifugal double-stacked fan blade 270, the brushless motor 210, the double-stacked PCBA 220, the motor end cover 240 is coaxially arranged in the air cavity 130, the capacitor 280 is axially overlapped with the brushless motor 210, namely the capacitor 280 is arranged on one side of the brushless motor 210 and longitudinally arranged, the centrifugal double-stack fan blade 270 is positioned at the air inlet 131 and can lead the air in the air gathering cavity into the air cavity 130, the double-layer PCBA board 220 is provided with a first heat dissipation hole 221, the first heat dissipation hole 221 increases the contact area of the double-layer PCBA board 220 and the air, the motor end cover 240 is provided with a second heat dissipation hole 242, the first heat dissipation hole 221 and the second heat dissipation hole 242 form an air flow path, the brushless motor 210 and the double-layer PCBA board 220 adopt an axial series structure, the double-layer PCBA board 220 comprises a PCB board and chips, the PCB board is arranged at the front end of the brushless motor 210 through a bracket, the chips are arranged on the PCB board, the MOS tubes 230 are annularly distributed between the PCB board and the bracket, and the integration of the brushless motor 210 and the double-layer PCBA board 220 is realized, that is, the double-layer PCBA board 220 for driving the brushless motor 210 and the brushless motor 210 realize an integrated structure, the motor damping washer 250 covers the rear end of the centrifugal double-laminated-wall fan 200 and is fixed at the air inlet 131 of the air cavity 130, the motor end cover 240 covers the double-layer PCBA board 220 and is also a clamping position for fixing the front end of the brushless motor 210, the inner cover 300 limits the front end of the brushless motor 210 behind the air outlet 132 of the air cavity by connecting with the motor end cover 240, the inner cover 300 is provided with a ventilation hole (not shown), the centrifugal double-laminated fan 270 is close to the air inlet 131, the MOS tube 230, the double-layer PCBA board 220 and the capacitor 280 are close to the air outlet 132, the air cavity 130 forms negative pressure during the operation of the brushless motor 210, external air is sucked into the air cavity 130 by the negative pressure and flows through the air cavity 130 at high speed and then is ejected from the air outlet 132, and the high-speed flowing wind energy quickly takes the double-layer PCBA board 220, the brushless motor 210, high heat generated by the operation of the MOS tube 230 and the capacitor 280, and meanwhile, since the heating element is closer to the air outlet 132, the taken heat is discharged from the air cavity tube 500 almost without loss, so as to provide a hot air effect, and no additional heating device is required to be arranged in the hand dryer, as a heating type hand dryer, no internal heating element is required, so that the manufacturing cost is reduced, the diameter of the air inlet 131 of the air cavity 130 is smaller than that of the air cavity 130, so as to form high-speed air, the centrifugal double-laminated-wall fan 200 can be installed from the second opening 120 of the chassis 100, the motor end cap 240 fixes the front end of the brushless motor 210, the motor end cap 240 is connected with the inner cover 300 in a positioning manner, the inner cover 300 is installed at the second opening 120 to limit the brushless motor 210 in the air cavity 130, the front cover 400 is installed on the front end face of the chassis 100 and connected with the inner cover 300, a positioning protrusion 241 is arranged on the contact face of the motor end cap 240 with the inner cover 300, the motor flat gasket 310 is attached with the motor flat gasket 310, the surface of the inner cover 310 is provided with the positioning protrusion 311, and the positioning protrusion 241 is used for matching with the motor end cap 120, and the positioning groove 320 is arranged on the inner cover 300, so as to match with the motor flat gasket 320, and the damping gasket 320. The mode that a traditional fan is installed from a first opening 110 of a case 100 is changed, by optimizing the layout of parts and the structure of the case, a centrifugal double-folded-wall fan 200 can be installed from a second opening 120 of the case 100, a double-layer PCBA board 220 and a MOS (metal oxide semiconductor) tube 230 are integrated at the front end of a brushless motor 210, a motor damping washer 250, the centrifugal double-folded-wall fan 200, a motor end cover 240 and an inner cover 300 are sequentially installed in a wind cavity 130 at the second opening 120, the inner cover 300 limits the position of the motor end cover 240, then the front cover 400 is connected with the inner cover 300, the alignment is visual and convenient, the assembly is convenient, the assembly efficiency is effectively improved, the motor damping washer 250 is mainly made of silica gel materials and is sleeved at the tail part of the centrifugal double-folded-wall fan 200 and abutted to a partition plate 160, the sealing effect is achieved except for a wind inlet 131 of the wind cavity 130, namely, air outside the wind cavity 130 can only enter the wind cavity 130 from the wind inlet 131, meanwhile, the motor damping gasket 250 can reduce the influence of vibration generated by the operation of the centrifugal double-overlapping-wall fan 200 on the whole hand dryer, the inner cover 300 is covered at the second opening 120, the sealing ring 320 is arranged between the inner cover 300 and the second opening 120, the sealing ring 320 plays a role of sealing the position except the air outlet 132 of the air cavity 130, so that the air outlet 132 of the front cover 400 forms the only air outlet 132, the positions near the air inlet 131 and the air outlet 132 of the case 100 are respectively sealed by the motor damping gasket 250 and the sealing ring 320, the air suction hole 610, the air inlet 131, the air cavity 130 and the air outlet 132 form a fluid path, the centrifugal double-overlapping-wall fan 200 operates at a high speed, so that negative pressure is formed in the air cavity 130, air outside the case 100 enters the air cavity 130 through the air inlet 131 after being sucked into the rear cover 600 (air gathering cavity) through the air suction hole 610 and then enters the air cavity 130 through the air inlet 131 and becomes a powerful high wind speed, the air is ejected from the air outlet 132 on the front cover 400, flows through the components in the air cavity 130 at a high speed and takes away heat dissipated by the components, that is, the air with a high temperature (about 45 ℃) generated by the air flows into the air cavity 500 from the air outlet 132, and is finally discharged from the fluid outlet 510 to dry the hands.

The utility model discloses a rational design in infrastructure, set up centrifugal double-layer fan blade 270 at air intake 131, the components and parts that generate heat because of work all arrange in wind chamber 130, electric capacity 280 locates brushless motor 210 one side and coincides with brushless motor 210 axial, double-deck PCBA board 220, MOS pipe 230 integration locates brushless motor 210 front end and locates air outlet 132 department, for double-deck PCBA board 220, MOS pipe 23, electric capacity 280 provides good radiating environment, the negative pressure induced drafts, form the high-speed wind in wind chamber 130, dispel the heat to the components and parts, the air after being heated simultaneously can reuse, the hot-blast temperature that the heating type hand drier produced is about 50 ℃, the about 45 ℃ that components and parts dispel the heat produced about, therefore the heat that components and parts produced is not too much with the hot-blast temperature difference that current hand drier produced, the hot-blast hand drier that can be used components and parts radiating and parts and forms, required electric energy is less, it sets up MOS pipe 230 in the radiating mode of air inlet end to change the tradition, air intake 131 does not have the barrier and is fast, thereby make hand drier air supply speed accelerate, dry effectual.

Further, a power supply main board 260 is disposed on a side surface of the case 100, the double-layer PCBA board 220 is electrically connected to the power supply main board 260, and the power supply main board 260 is electrically connected to an external power supply through a power line and a plug.

Furthermore, a plurality of second air suction holes 150 are formed in two side walls of the chassis 100, the two side walls are respectively connected to the left filter assembly 700 and the right filter assembly 800, a gap is formed between the outer surface of the air cavity 130 and the inner surface of the cavity 140 (the side wall surface of the chassis 100), an air inlet channel (not shown) is formed in the gap, the left filter assembly 700 and the right filter assembly 800 can filter large particle dust in the outside air, the filtered air flows through the air inlet channel from the second air suction holes 150 on the two sides of the chassis 100 and then enters the rear cover 600, meanwhile, the air suction holes 610 in the rear cover 600 also suck the filtered air into the rear cover 600, the second air suction holes 150 are distributed in the two side walls of the chassis 100, so that the intake air flow is increased, air flow entering from the two sides is formed, the air in the rear cover 600 flows into the air cavity 130 from the air inlet 131, and the air entering the chassis 100 is filtered by the left filter assembly 700 and the right filter assembly 800, thereby preventing the large particle dust from affecting the performance of the motor assembly 200.

Because the double-layer PCBA board 220, the MOS tube 230 and the capacitor 280 driving the brushless motor 210 generate heat at a very high temperature during operation, and the high temperature may damage components and MOS tubes 230 on the double-layer PCBA board 220, the double-layer PCBA board 220 must be subjected to heat dissipation treatment, the double-layer PCBA board 220, the MOS tubes 230 and the capacitor 280 are located on a path through which air circulates and at an air outlet 132 end, it can be known from bernoulli's equation (conservation of energy) that when kinetic energy increases, pressure energy decreases, the brushless motor 210 rotates to form negative pressure in the air cavity 130, air outside the case 100 is sucked into the back cover 600, the back cover 600 sucks air outside the case 100 through the air suction holes 610, and simultaneously air outside the case 100 enters the cavity 140 through the second air suction holes 150 and flows into the back cover 600 through the centrifugal air inlet channel, the double-folded 270 operates at the air inlet 131 to introduce air into the air cavity 130, as can be known from the venturi effect, when the fluid flows from the large-diameter channel to the small-diameter channel, the flow rate is increased, because the cross-sectional area of the air inlet 131 is smaller than that of the air cavity 130, air entering the rear cover 600 is sucked into the air cavity 130 from the air inlet 131, high-pressure and high-speed air is formed to pass through the air cavity 130 and is sprayed out from the air outlet 132, the process completely covers the double-layer PCBA 220, the MOS tube 230 and the capacitor 280, the heat dissipation effect is very good, because the heat generated by the double-layer PCBA 220, the MOS tube and the capacitor 280 of the driving motor is high, the sucked air flows through the surfaces of the double-layer PCBA 220 and the MOS tube 230 at high speed, the double-layer PCBA 220 and the MOS tube 230 are integrated at the front end of the brushless motor 210 and are positioned at the air outlet 132, the distance from the air cavity tube 500 and the air outlet 910 of the hand dryer is very close, the heat blown out at high speed and high pressure almost does not have loss and reaches the air outlet 910 of the hand dryer, and the heat energy band generated by all electronic components on the path through which the air flows is blown out from the air outlet 132 to the air outlet 910, the heat energy is utilized to the maximum extent, namely the air outlet of the hand dryer is heated, the built-in heating device of the traditional hand dryer is replaced, components in the hand dryer are effectively radiated, and the hot air formed due to radiation is reused for drying the hands.

The above embodiments are only for describing the preferred embodiments of the present invention, and are not intended to limit the scope of the present invention, and various modifications and improvements made by the technical solution of the present invention by those skilled in the art are all within the scope of the present invention as defined by the claims.

Claims

1. The utility model provides an utilize components and parts work to produce heat and realize hot-blast hand dryer, includes quick-witted case, quick-witted case both sides be equipped with the hole of induced drafting, machine case front end be equipped with the wind cavity pipe, the wind cavity pipe is corresponding with the air outlet nozzle of shell, quick-witted case the cavity have, the cavity pass through the baffle and separate and gather wind cavity and wind cavity, it is equipped with the air intake to gather between wind cavity and the wind cavity, the front end in wind cavity is equipped with the air outlet, forms the route of circulation of air between air intake and air outlet, its characterized in that: be equipped with centrifugal double-layer wall fan blade fan in the wind chamber, centrifugal double-layer wall fan blade fan including connecting gradually and being located centrifugal double-layer fan blade, brushless motor, MOS pipe, double-deck PCBA board and the electric capacity on the route of circulation of air, centrifugal double-layer fan blade locate brushless motor's rear end and be located air intake department, the MOS pipe welding is in on the double-deck PCBA board, electric capacity locate brushless motor one side and with double-deck PCBA board electric connection, double-deck PCBA board integration is at the brushless motor front end and is located air outlet department.

2. The hand dryer capable of generating heat to achieve hot air by using the work of components and parts as claimed in claim 1, wherein: the double-layer PCBA board is provided with first heat dissipation holes.

3. The hand dryer capable of generating heat to achieve hot air by using the work of components and parts as claimed in claim 1, wherein: the axial direction of the capacitor is coincided with the axial direction of the brushless motor.

4. The hand dryer capable of generating heat to achieve hot air by using the work of components and parts as claimed in claim 1, wherein: the sectional area of the air inlet is smaller than that of the air cavity.

5. The hand dryer capable of generating heat to achieve hot air by using the work of components and parts as claimed in claim 1, wherein: and a motor damping washer is arranged at the rear end of the centrifugal double-laminated-wall fan.

6. The hand dryer capable of generating heat to achieve hot air by using the work of components and parts as claimed in claim 1, wherein: the case comprises a shell which is communicated with the front and the back, the shell is provided with a first opening and a second opening, the first opening is provided with a back cover, the second opening is provided with a front cover, the air gathering cavity is positioned in the back cover, the air outlet is positioned in the front cover, and the air outlet is connected with the air duct cavity.

7. The hand dryer capable of generating heat to achieve hot air by using the work of components as claimed in claim 6, wherein: centrifugal double-laminated-wall fan further comprises a motor end cover and an inner cover, wherein a second heat dissipation hole is formed in the motor end cover, the double-layer PCBA board is packaged in the motor end cover, the inner cover covers the second opening and limits the motor end cover at the second opening, a sealing ring is arranged between the inner cover and the second opening, and the front cover is arranged above the inner cover.

8. The hand dryer capable of generating heat to achieve hot air by using the components as claimed in claim 7, wherein: the motor end cover is provided with a positioning bulge, the inner cover is attached with a motor flat gasket, a positioning groove is formed in the surface of the motor flat gasket, and the motor end cover and the inner cover are matched and positioned with the positioning bulge through the positioning groove.

9. The hand dryer capable of generating heat to achieve hot air by using the work of components and parts as claimed in claim 1, wherein: the side of the case is provided with a power supply main board, and the power supply main board is electrically connected with the double-layer PCBA board.

10. The hand dryer capable of generating heat through the work of components and parts to achieve hot air as claimed in claim 1, wherein: and two sides of the case are respectively provided with a filtering component.