CN217091699U

CN217091699U - Miniature fan

Info

Publication number: CN217091699U
Application number: CN202122907674.8U
Authority: CN
Inventors: 郭瑞; 张振建; 章律
Original assignee: Shenzhen Dedaxing Drive Technology Co ltd
Current assignee: Shenzhen Dedaxing Drive Technology Co ltd
Priority date: 2021-11-25
Filing date: 2021-11-25
Publication date: 2022-08-02
Anticipated expiration: 2031-11-25

Abstract

The utility model discloses a micro fan, including the shell body, be equipped with air intake and air outlet on this shell body, this internal wind cavity that has of shell, this wind cavity is through air intake and air outlet and external intercommunication, the wind intracavity is equipped with the fan blade, this fan blade is by motor drive, the motor includes the casing, stator and rotor of setting in the casing, wherein the rotor includes the pivot, installs the magnet steel in the pivot, is connected with the fan blade behind the casing is stretched out to the one end of pivot, and the stator includes the iron core, and footpath upwards, the magnet steel is apart from the distance more than or equal to 1.8mm of iron core, the utility model discloses the design of fan blade is small and exquisite, and drive fan blade pivoted motor rotation inertia is littleer, more does benefit to frequently opening and stops, and the reduction of fan blade size can promote the reduction of fan spiral case, has the damping design on the fan spiral case, and air outlet department has the design of making the noise reduction, makes whole fan vibration little, and the noise is low.

Description

Miniature fan

Technical Field

The utility model relates to a fan technical field, concretely relates to micro-fan.

Background

In modern clinical medicine, a ventilator has been widely used in respiratory failure due to various reasons, anesthesia and breathing management during major surgery, respiratory support therapy and emergency resuscitation as an effective means for manually replacing the function of spontaneous ventilation, and has a very important position in the modern medical field. The breathing machine is a vital medical device which can prevent and treat respiratory failure, reduce complications and save and prolong the life of a patient.

The ventilator is more and more common in household application due to the rapid development of modern medical technology, the blower for the ventilator comprises a volute, a fan blade and a motor for driving the fan blade to rotate, the rotational inertia of the motor of the existing blower is large, the high-frequency starting and stopping are not facilitated, and the cogging torque of a slotted iron core during operation fluctuates.

SUMMERY OF THE UTILITY MODEL

In view of this, the utility model provides a fan spiral case that noise is low.

The technical scheme is as follows: the utility model provides a micro fan, its key lies in: the fan blade type air conditioner comprises a shell body, wherein an air inlet and an air outlet are formed in the shell body, an air cavity is formed in the shell body, the air cavity is communicated with the outside through the air inlet and the air outlet, and fan blades are arranged in the air cavity and driven by a motor;

the motor includes the casing, sets up stator and the rotor in the casing, and wherein the rotor includes the pivot, installs the magnet steel in the pivot, the one end of pivot stretch out behind the casing with the fan blade is connected, the stator includes the iron core, and is footpath, the magnet steel is apart from the distance more than or equal to 1.8mm of iron core.

By adopting the technical scheme, after the distance between the magnetic steel and the iron core of the motor is enough, the rotational inertia is smaller, frequent start and stop are facilitated, and meanwhile, the cogging torque can be effectively reduced, so that the rotating speed of the motor is stable.

Preferably:

the iron core comprises a cylindrical iron core body, wherein M stator teeth are uniformly arranged on the inner wall of the iron core body, each stator tooth consists of a tooth root part and a tooth top part, the tooth root part is fixed on the inner wall of the iron core body, the tooth top part faces to the axial lead of the iron core body, and M is an integer greater than 2;

the magnetic steel is cylindrical, the rotating shaft is inserted into the center of the magnetic steel, and the distance between the outer wall of the magnetic steel and the top of the teeth of the stator teeth is larger than or equal to 1.8 mm.

By adopting the structure, the rotational inertia of the motor can be reduced only by arranging enough distance between the magnetic steel and the stator teeth.

The thickness of the shell body is B1, the shell body is provided with a vibration damping structure, the thickness of the shell body at the vibration damping structure is B2, and B2 is not equal to B1;

the air outlet is connected with a noise reduction cylinder, N noise reduction spacers are arranged in the noise reduction cylinder, N is a natural number, and the N noise reduction spacers are distributed along the flowing direction of fluid in the noise reduction cylinder.

By adopting the structure, the thickness of the shell body is changed from the traditional uniform thickness into the structure with the changed thickness, and the change of the thickness causes the resonance frequency of the shell body to be different at different positions, so that the resonance of the volute at a certain point can be eliminated or reduced, and the resonance noise is reduced; further, when wind flows out of the shell, sound waves can be offset in the pipeline due to the noise reduction barrel, wave crests collide with wave troughs, air flow is weakened when fluid flows out, generated vibration is reduced, and therefore noise is reduced.

The inner wall of the noise reduction barrel is provided with noise reduction grooves along the circumferential direction, and noise reduction spacers are formed between adjacent noise reduction grooves.

The casing body comprises an upper volute and a lower volute which are matched with each other, the vibration reduction structure comprises a first vibration reduction groove and a second vibration reduction groove, the first vibration reduction groove is formed in the upper volute, the second vibration reduction groove is formed in the lower volute, and B2 is smaller than B1. With this structure, resonance on both the upper and lower volutes can be eliminated or reduced.

The top of the upper volute is provided with the air inlet, the first vibration reduction groove is formed along the lower edge of the upper volute towards the air inlet, and the width of the first vibration reduction groove is reduced from the lower edge of the upper volute towards the air inlet;

the second vibration reduction groove is an arc-shaped groove and is formed in the height direction of the lower volute.

By adopting the structure, the vibration reduction effect is better.

The first vibration reduction grooves are uniformly distributed on the upper volute around the air inlet, the depth of each first vibration reduction groove is 1mm-3mm, and the width of each first vibration reduction groove is 1mm-5 mm. By adopting the structure, the vibration reduction effect is better.

One part of the shell body extends towards one side to form a tubular air outlet pipe, the air outlet pipe is connected with the noise reduction cylinder, and a noise reduction plate is arranged in the air outlet pipe;

the noise reduction plate is of an arc-shaped plate structure, the arc-shaped surface of the noise reduction plate is connected with the inner wall of the air outlet pipe, the circle center of the end surface of the noise reduction plate is overlapped with the circle center of the air outlet, and the thickness of the thickest part of the noise reduction plate is smaller than one third of the radius of the air outlet.

By adopting the structure, the noise reduction plate can change the air outlet path, thereby reducing the noise.

Compared with the prior art, the beneficial effects of the utility model are that: the fan blades are small in design, the rotational inertia of a motor driving the fan blades to rotate is smaller, frequent starting and stopping are facilitated, the size of the fan blades can be reduced, the fan volute is provided with a vibration reduction design, the air outlet is provided with a noise reduction design, and therefore the whole fan is small in vibration and low in noise.

Drawings

Fig. 1 is a schematic perspective view of a first viewing angle of the present invention;

fig. 2 is a schematic plan view of the first viewing angle of the present invention;

FIG. 3 is a cross-sectional view A-A of FIG. 2;

fig. 4 is a schematic plan view of the second viewing angle of the present invention;

fig. 5 is a schematic perspective view of a second viewing angle of the present invention;

FIG. 6 is a schematic view of the internal structure of the air outlet pipe;

fig. 7 is a schematic perspective view of a fan blade;

fig. 8 is a schematic plane structure diagram of a fan blade.

Detailed Description

The present invention will be further described with reference to the following examples and accompanying drawings.

As shown in fig. 1 and 4-6, a micro fan includes a casing 1, an air inlet 2 and an air outlet are provided on the casing 1, an air chamber is provided in the casing 1, the air chamber is communicated with the outside through the air inlet 2 and the air outlet, a fan blade 4 is provided in the air chamber, and the fan blade 4 is driven by a motor 5.

The thickness of the shell body 1 is B1, the shell body 1 is provided with a damping structure 6, the thickness of the shell body 1 at the damping structure 6 is B2, and B2 is not equal to B1.

B2 may be greater than B1 or less than B1. The utility model discloses in B2 < B1 specifically does, shell body 1 is including last spiral case 1a and lower spiral case 1B of mutually supporting, goes up the spiral case and adopts ultrasonic bonding with lower spiral case, damping structure 6 includes first damping recess 6a and second damping recess 6B, upward seted up on spiral case 1a first damping recess 6a, seted up on the spiral case 1B down second damping recess 4B, the thickness that leads to the spiral case because the existence of recess is become thickness by traditional unified thickness and has the change.

The top of the upper volute casing 1a is provided with an air inlet 2, the first vibration reduction groove 6a is formed along the lower edge of the upper volute casing 1a towards the direction of the air inlet 2, the width of the first vibration reduction groove 6a is reduced from the lower edge of the upper volute casing 1a towards the direction of the air inlet 2, preferably, the first vibration reduction grooves 6a are uniformly distributed on the upper volute casing 1a around the air inlet 2, the depth of the first vibration reduction groove 6a is 1mm-3mm, and the width of the first vibration reduction groove 6a is 1mm-5 mm.

The second vibration reduction grooves 6b are circular arc grooves, the second vibration reduction grooves 6b are formed in the height direction of the lower volute 1b, preferably, the second vibration reduction grooves 6b are uniformly formed in the lower volute 1b in the circumferential direction, the thickness of the upper volute and the thickness of the lower volute at the grooves are reduced, and due to the change, the resonance frequencies of different positions of the shell body are different, so that the volute resonance at a certain point is eliminated.

One part of the shell body 1 extends towards one side to form a tubular air outlet pipe 10, an outlet of the air outlet pipe 10 forms an air outlet, a noise reduction plate 1 is installed in the air outlet pipe 10, specifically, one part of the upper volute and one part of the lower volute extend towards one side respectively to form an approximately semicircular tubular structure, the upper volute and the lower volute are in butt joint to form the air outlet pipe 10, and the noise reduction plate 11 can be installed in the extending part of the upper volute and can also be installed in the extending part of the lower volute. The utility model discloses in, fall board 11 of making an uproar be convex platelike structure, its arc surface form face with go out the interior wall connection of tuber pipe 10, specifically, its arc surface form face with go up the extension of spiral case's inner wall fixed connection, fall the board 11 of making an uproar and spread the whole extension's of going up the spiral case inner wall, fall the terminal surface and the air outlet parallel and level of board 11 of making an uproar, fall the centre of a circle of the board 11 terminal surface of making an uproar with the centre of a circle coincidence of air outlet, fall the thickness of board 11 thickest department of making an uproar and be less than the radial third of air outlet, preferably, fall the thickness of board 11 thickest department of making an uproar and do between the radial fifth of air outlet to the third, its fifth of more than or equal to promptly, be less than the third.

The air outlet is connected with a noise reduction cylinder 7, N noise reduction spacers 8 are arranged in the noise reduction cylinder 7, N is a natural number, and the N noise reduction spacers 8 are distributed along the flowing direction of fluid in the noise reduction cylinder 7. Of course, the noise reduction drum 7 can also be arranged at the air inlet 2.

The utility model discloses in, N is 3, fall the spacer 8 of making an uproar and be the ring form, its outer lane with fall the interior wall connection of a section of thick bamboo 7 of making an uproar. The inner wall of the noise reduction barrel 7 is provided with noise reduction grooves 9 along the circumferential direction, and noise reduction spacers 8 are formed between the adjacent noise reduction grooves 9.

Fall the spacer 8 slope setting of making an uproar, in the utility model discloses, fall the spacer 8 court of making an uproar the air outlet direction slope sets up, certainly also can make fall the spacer of making an uproar and fall the setting of the export direction slope of a section of thick bamboo 7 of making an uproar, falls the spacer 8 can also be perpendicular to the hole center line setting of a section of thick bamboo 7 of making an uproar when necessary.

The section of thick bamboo 8 of making an uproar can set up with the shell body components of a whole that can function independently, in the utility model discloses in make an uproar section of thick bamboo 8 with 1 integrated into one piece of shell body, promptly make an uproar section of thick bamboo 8 and play tuber pipe 10 integrated into one piece fall, just make an uproar section of thick bamboo 8's inner wall with the butt joint of the inner wall parallel and level of the shell body 1 of air outlet department, the wall thickness of making an uproar section of thick bamboo 8 is greater than the wall thickness of air outlet department casing, and the orthographic projection of the casing of air outlet department on the groove 9 of making an uproar is located the tank bottom inboard of the groove of making an uproar.

As shown in fig. 2 and 3, the motor is installed in the lower volute 1b, the motor 5 includes a casing 501, a stator and a rotor that are arranged in the casing 501, the rotor includes a rotating shaft 502 that is inserted into the center of the casing 501, a magnetic steel 503 is installed on the rotating shaft 502, one end of the rotating shaft 502 extends out of the casing 501 and is connected with the fan blade 4, the stator includes an iron core 504, and a distance between the magnetic steel 503 and the iron core 504 is greater than or equal to 1.8mm in a radial direction.

The iron core 504 comprises a cylindrical iron core body 504a, the outer wall of the iron core body 504a is connected with the inner wall of the casing 501, M stator teeth 504b are uniformly installed on the inner wall of the iron core body 504a, the stator teeth 504b are used for winding a coil winding (not shown in the figure), the stator teeth 504b are composed of tooth roots and tooth tops, wherein the tooth roots are fixed on the inner wall of the iron core body 504a, the tooth tops face the axial lead of the iron core body 504a, and M is an integer greater than 2; the magnetic steel 503 is cylindrical and is formed by combining four tile-shaped blocks, the rotating shaft 502 is inserted into the center of the magnetic steel, the top of the tooth is of an approximate C-shaped structure, and the distance between the outer wall of the magnetic steel 503 and the top of the tooth of the stator tooth 504b is larger than or equal to 1.8 mm.

In the utility model discloses, the root of tooth installs the line frame, winds on this line frame and establishes coil winding.

The wind cavity is arranged between the upper portion of the lower volute and the upper volute, as shown in fig. 7 and 8, the fan blade 4 comprises a base plate 401, a power connection point is arranged on the base plate 401, Z blades 2 are arranged on the base plate 401 around the power connection point, Z is a natural number, the outer diameter of the outlet of each blade 402 is D1, D1 is 28-32mm, the blade angle β 1 at the inlet of each blade 2 and the blade angle β 2 at the outlet of each blade are 15-50 °, the inner diameter of the inlet of each blade 2 is D2, D2 is 4-10mm, and Z is a natural number of 6-13.

The width of the inlet between the adjacent blades 402 is B1, the width of the outlet is B2, B1 is 2-3mm, and B2 is 5-10 mm.

The power connection point is a connection hole 403, a fixed seat 404 is arranged on the chassis 401 around the connection hole 403, one end of the rotating shaft 502 penetrates through the connection hole 403 and then is connected with the fixed seat 404, and the height of the blade 402 is increased from the outlet of the blade to the power connection point, then is stabilized and then is decreased. The length of the section with the height increasing trend of the blade 3 is larger than that of the section with the height decreasing trend, and the length of the stable section of the height maintaining blade 402 is the shortest.

In practical applications, D1 may be 29, 30, 31mm, D2 may be 5, 6, 7mm, Z may be 7, 8, 9, 10, etc., in the present invention, Z ═ 11, B1 may be 2.1, 2.2, 2.3mm, etc., B2 may be 6, 7, 8, 9mm, etc., β 1, β 2 may be 20 °, 25 °, 30 °, 35 °, etc., which are not limited to these examples.

Finally, it should be noted that the above description is only a preferred embodiment of the present invention, and those skilled in the art can make various similar representations without departing from the spirit and the scope of the present invention.

Claims

1. The utility model provides a micro fan which characterized in that: the air-conditioning shell comprises a shell body (1), wherein an air inlet (2) and an air outlet are formed in the shell body (1), an air cavity is formed in the shell body (1), the air cavity is communicated with the outside through the air inlet (2) and the air outlet, a fan blade (4) is arranged in the air cavity, and the fan blade (4) is driven by a motor (5);

motor (5) include casing (501), set up stator and rotor in casing (501), and wherein the rotor includes pivot (502), installs magnet steel (503) on pivot (502), the one end of pivot (502) stretch out casing (501) after with fan blade (4) are connected, the stator includes iron core (504), and radially, magnet steel (503) are apart from the distance more than or equal to 1.8mm of iron core (504).

2. The micro fan according to claim 1, wherein: the iron core (504) comprises a cylindrical iron core body (504a), M stator teeth (504b) are uniformly arranged on the inner wall of the iron core body (504a), each stator tooth (504b) consists of a tooth root part and a tooth top part, the tooth root part is fixed on the inner wall of the iron core body (504a), the tooth top part faces to the axial lead of the iron core body (504a), and M is an integer greater than 2;

the magnetic steel (503) is cylindrical, the rotating shaft (502) is inserted into the center of the magnetic steel, and the distance between the outer wall of the magnetic steel (503) and the top of the stator teeth (504b) is larger than or equal to 1.8 mm.

3. A micro-fan according to claim 1 or 2, characterised in that: the thickness of the shell body (1) is B1, the shell body (1) is provided with a damping structure (6), the thickness of the shell body (1) at the damping structure (6) is B2, and B2 is not equal to B1;

the air outlet is connected with a noise reduction cylinder (7), N noise reduction spacers (8) are arranged in the noise reduction cylinder (7), N are natural numbers, and the N noise reduction spacers (8) are distributed along the flowing direction of fluid in the noise reduction cylinder (7).

4. A micro fan according to claim 3, wherein: the casing body (1) comprises an upper volute (1a) and a lower volute (1B) which are matched with each other, the vibration reduction structure (6) comprises a first vibration reduction groove (6a) and a second vibration reduction groove (6B), the first vibration reduction groove (6a) is formed in the upper volute (1a), the second vibration reduction groove (6B) is formed in the lower volute (1B), and B2 is less than B1.

5. The micro fan according to claim 4, wherein: the top of the upper volute (1a) is provided with the air inlet (2), the first vibration reduction groove (6a) is formed along the lower edge of the upper volute (1a) towards the direction of the air inlet (2), and the width of the first vibration reduction groove (6a) is reduced from the lower edge of the upper volute (1a) towards the direction of the air inlet (2);

the second vibration reduction groove (6b) is an arc-shaped groove, and the second vibration reduction groove (6b) is formed in the height direction of the lower volute (1 b).

6. The micro fan according to claim 5, wherein: the first vibration reduction grooves (6a) are uniformly distributed on the upper volute (1a) around the air inlet (2), the depth of each first vibration reduction groove (6a) is 1-3 mm, and the width of each first vibration reduction groove is 1-5 mm.

7. A micro fan according to claim 3, wherein: the inner wall of the noise reduction barrel (7) is provided with noise reduction grooves (9) along the circumferential direction, and noise reduction spacers (8) are formed between the adjacent noise reduction grooves (9).

8. A micro fan according to claim 3, wherein: a part of the shell body (1) extends towards one side to form a tubular air outlet pipe (10), an outlet of the air outlet pipe (10) forms the air outlet, and a noise reduction plate (11) is installed in the air outlet pipe (10);

the noise reduction plate (11) is of an arc-shaped plate structure, the arc-shaped surface of the noise reduction plate is connected with the inner wall of the air outlet pipe (10), the circle center of the end surface of the noise reduction plate (11) is coincided with the circle center of the air outlet, and the thickness of the thickest part of the noise reduction plate (11) is smaller than one third of the radius of the air outlet.

9. A micro fan according to claim 3, wherein: the fan blade (4) comprises a chassis (401), a power connection point is arranged on the chassis (401), the rotating shaft (502) is connected with the chassis (401) at the power connection point, the chassis (401) is provided with Z blades (402) around the power connection point, Z is a natural number, the outer diameter of the outlet of each blade (402) is D1, D1 is 28-32mm, the inner diameter of the inlet of each blade (402) is D2, D2 is 4-10mm, and the blade angle beta 1 of the inlet of each blade (402) and the blade angle beta 2 of the outlet of each blade are 15-50 degrees.

10. The micro air blower according to claim 9, wherein: the width of the inlet between the adjacent blades (402) is B1, the width of the outlet is B2, B1 is 2-3mm, and B2 is 5-10 mm.