A silent duct exhaust fan

Abstract

The present invention provides a silent duct exhaust fan, which belongs to the technical field of exhaust fans. The silent duct exhaust fan comprises an exhaust tube, wherein a stator and a rotor are arranged inside the exhaust tube, and two stators are arranged on the exhaust tube. The rotor rotates between the two stators and rotates relative to the stators. A cavity is provided inside the rotor, and a fan component is provided inside the cavity, so that the fan component can be driven to rotate when the rotor rotates; the rotor is rotated by the cooperation between the stator and the rotor, and the fan component can be driven to rotate by the rotation of the rotor, so that air can be sucked into the interior of the exhaust tube and discharged from the outlet, thereby achieving the purpose of exhaust. Since the installation of driving components such as a motor is avoided inside the exhaust tube, the noise generated by the direct impact of air on the motor can be avoided, which is beneficial to the noise reduction of the fan.

Description

Technical Field

[0001] The invention belongs to the technical field of exhaust fans, and in particular relates to a silent duct exhaust fan. Background Art

[0002] Exhaust fans, also known as negative pressure fans, negative pressure fans, etc., use air convection to keep the room in a negative pressure state, forming a suction force, continuously inhaling outdoor air and expelling the stuffy air in the room, thereby achieving the effect of ventilation and cooling.

[0003] like Figure 1 As shown, the existing exhaust fan is usually composed of a mounting frame, a motor and a fan. The motor is installed in the middle of the frame to drive the fan to rotate. The rotation of the fan can suck air into the interior of the frame. Since the motor is installed in the middle of the frame, the sucked air will directly hit the tail of the motor, causing the exhaust fan to generate some noise, which is not conducive to the noise reduction of the exhaust fan. Summary of the Invention

[0004] The purpose of the present invention is to provide a silent duct exhaust fan, which aims to solve the problem in the prior art that the exhaust fan has a motor installed in the middle of the frame, and the inhaled air directly hits the tail of the motor, causing the exhaust fan to generate some noise, which is not conducive to noise reduction of the exhaust fan.

[0005] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: A silent duct exhaust fan, comprising: an exhaust tube, a stator and a rotor are arranged inside the exhaust tube, two stators are arranged on the exhaust tube, the rotor rotates between the two stators and rotates relative to the stators, a cavity is provided inside the rotor, a fan component is provided inside the cavity, so that the fan component can be driven to rotate when the rotor rotates, and silencers for eliminating noise are provided on both sides of the exhaust tube, and the silencers can be used to position the rotation axis of the rotor.

[0006] A further technical solution of the present invention is that the fan component includes a rotating drum, which is connected to the inner wall of the cavity. No less than two fan blades are arranged inside the rotating drum, and no less than two ends of the fan blades close to each other are connected by a rotating shaft. Reinforcement columns for improving the stability of the fan blades are provided at both ends of the rotating shaft.

[0007] A further technical solution of the present invention is that both ends of the rotating drum extend to the interior of the silencer seat and are provided with bearings, and the outer ring of the bearing is provided on the silencer seat.

[0008] A further technical solution of the present invention is that the silencer seat includes a connecting end, which can be connected to the end face of the exhaust cylinder, a frustum is provided on the side of the connecting end away from the exhaust cylinder, the end of the frustum with a smaller diameter is connected to the frustum, and the end of the frustum away from the connecting end is provided with a connecting cylinder for installing a pipe, a ventilation hole communicating with the interior of the rotating cylinder is provided on the connecting cylinder, a silencer hole for suppressing noise is provided on the frustum, and an installation groove for installing a bearing is provided on the end of the silencer seat close to the exhaust cylinder.

[0009] A further technical solution of the present invention is that the bearing is provided with an oil inlet hole and an oil inlet bin communicated with the inside of the oil inlet hole, a swinging groove is provided on the mounting groove, the oil inlet bin can move in the swinging groove, a first elastic member is provided in the swinging groove to center the oil inlet bin, two oil filling holes are provided on both sides of the oil inlet bin on the frustum, a one-way valve is provided at one end of the oil filling hole close to the bearing, and when the oil inlet bin moves to the one-way valve, the one-way valve can be opened to allow the lubricating oil to enter the interior of the oil inlet bin.

[0010] A further technical solution of the present invention is that the one-way valve includes a second elastic member and a steel ball arranged inside the oil filling hole, the steel ball is located at the oil filling hole close to the first end of the bearing, and a part of the steel ball is exposed to the outside of the oil filling hole through a limiting flange, and the second elastic member can be close to the limiting flange through the steel ball.

[0011] A further technical solution of the present invention is that a counter-part is provided on the oil inlet bin, and the counter-part is higher than the side wall of the oil inlet bin. When the counter-part is located at the one-way valve, the steel ball can be pushed into the inside of the oil filling hole.

[0012] A further technical solution of the present invention is that an oil storage tank is provided on the exhaust tube, and an oil filling pipe is provided on the oil storage tank. The oil filling pipe is connected to the oil filling hole so that the oil filling hole and the interior of the oil storage tank are communicated. The oil storage tank is also provided with an oil pump for drawing lubricating oil into the oil filling pipe.

[0013] A further technical solution of the present invention is that there is a notch on the connecting tube, a mounting bracket is provided in the notch, a sound-absorbing sponge is provided in the mounting bracket, and a vent hole for allowing air to pass through is provided on the mounting bracket.

[0014] A further technical solution of the present invention is that the silencer seat is provided with a connector located at the oil filling hole, and the oil filling pipe can be inserted into the connector.

[0015] Compared with the prior art, the present invention has the following beneficial effects:

[0016] 1. This silent duct exhaust fan rotates the rotor through the cooperation between the stator and the rotor. The rotation of the rotor can drive the fan components to rotate, and the air can be sucked into the interior of the exhaust tube and discharged from the outlet, thereby achieving the purpose of exhaust. Since the interior of the exhaust tube avoids the installation of driving components such as the motor, the noise generated by the air directly hitting the motor can be avoided, which is beneficial to the noise reduction of the fan.

[0017] 2. This silent duct exhaust fan has an oil inlet hole set on the bearing. When the friction of the bearing becomes larger, the friction can drive the oil inlet hole to move to the one-way valve, so that the one-way valve opens and lubricating oil is injected into the oil inlet hole, thereby lubricating the bearing and avoiding the noise caused by excessive bearing friction. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0019] Figure 1 It is a structural diagram of the prior art;

[0020] Figure 2 It is a structural schematic diagram of a specific embodiment of the present invention;

[0021] Figure 3 It is a schematic diagram of the explosion structure of a specific embodiment of the present invention;

[0022] Figure 4 Schematic diagram of the installation structure of the exhaust cylinder, stator and rotor in a specific embodiment of the present invention;

[0023] Figure 5 It is an axonometric cross-sectional view of a specific embodiment of the present invention;

[0024] Figure 6 A schematic structural diagram of a muffler seat in a specific embodiment of the present invention;

[0025] Figure 7 A schematic diagram of the installation structure of a one-way valve in a specific embodiment of the present invention;

[0026] Figure 8 Schematic diagram of the structure of a bearing in a specific embodiment of the present invention.

[0027] In the figure: 1. exhaust tube; 2. stator; 3. rotor; 4. cavity; 5. fan components; 501. rotating drum; 502. fan blades; 503. rotating shaft; 504. reinforcing column; 6. silencer seat; 601. connecting end; 602. cone; 603. connecting cylinder; 604. ventilation hole; 605. silencer hole; 6051. swing groove; 606. oil filling hole; 607. mounting groove; 7. pipeline; 8. bearing; 801. oil inlet hole; 802. oil inlet tank; 803. first elastic member; 804. offset member; 9. one-way valve; 901. second elastic member; 902. steel ball; 903. limit flange; 904. limit member; 10. oil storage tank; 11. oil filling pipe; 12. connector; 13. notch; 14. mounting bracket; 15. silencer sponge; 16. ventilation hole. DETAILED DESCRIPTION

[0028] The purpose of the invention is to provide a silent duct exhaust fan, which aims to solve the problem in the prior art that the exhaust fan motor is installed in the middle of the frame, and the inhaled air directly hits the tail of the motor, causing the exhaust fan to generate some noise, which is not conducive to noise reduction of the exhaust fan. Therefore, the following solution is proposed to solve this problem:

[0029] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0030] See also Figure 2-4 The present invention provides the following technical solutions: a silent duct exhaust fan, comprising an exhaust tube 1, which is circular and made of metal material. A stator 2 and a rotor 3 are provided inside the exhaust tube 1. There are two stators 2 fixed inside the exhaust tube 1, and the rotor can rotate between the two stators 2. A cavity 4 is provided in the middle of the rotor 3, and a fan component 5 is provided inside the cavity 4. The fan component 5 is fixed inside the cavity 4, so that when the rotor 3 rotates, the fan component 5 can be driven to rotate. The rotation principle of the rotor 3 can refer to the working principle of a brush motor, which will not be repeated here.

[0031] The stator 2 is a semicircular permanent magnet that can be connected to the inner wall of the exhaust tube 1 by adhesive. There is a gap between the two stators 2. The inner wall of the exhaust tube 1 is integrally formed with a protrusion located inside the gap, which can be used to further limit and fix the stator 2.

[0032] The rotor 3 is circular, with an even number of T-shaped protrusions arranged in a uniform annular pattern on its outer surface. The protrusions are integrally formed with the rotor 3 and can be used for winding coils. The cavity 4 is circular, runs through the middle of the rotor 3 along the axis of the rotor 3, and is coaxially arranged with the rotor 3.

[0033] Of course, two brushes (not shown in the figure) are also installed on the exhaust tube 1, and the brushes are connected to the external power supply through a power line (not shown in the figure);

[0034] The fan component 5 has a rotating drum 501, which can be fixed to the inside of the cavity 4 by an adhesive, so that the rotor 3 can drive the rotating drum 501 to rotate. The inner wall of the rotating drum 501 is integrally formed with four fan blades 502. The number of fan blades 502 can be three, five or six. In this embodiment, the number of fan blades 502 is not limited. The four fan blades 502 are evenly arrayed in an annular manner on the rotating drum 501, and the ends of the four fan blades 502 away from the rotating drum 501 are fixed to the rotating shaft 503 (see FIG. 2 ). Figure 5 ) are interconnected, the rotating shaft 503 and the fan blades 502 are formed in one piece, and reinforcing columns 504 are formed in one piece at both ends of the rotating shaft 503. The reinforcing columns 504 are perpendicular to the axis of the rotating shaft 503, so that the rotating shaft 503 is connected to the rotating drum 501 through the reinforcing columns 504, thereby improving the rotation stability of the fan blades 502, reducing the vibration generated when the fan blades 502 rotate, and thus reducing noise.

[0035] Since the rotor 3 rotates inside the stator 2, there is a small gap between the rotor 3 and the stator 2 to reduce the friction and noise between the rotor 3 and the stator 2. Therefore, the rotor 3 will shake when it rotates. In order to solve the shaking problem, Figure 5 and Figure 7 As shown, silencer seats 6 can be installed at both ends of the exhaust tube 1 by screws, and the silencer seats 6 can be connected to the pipe 7. The two ends of the rotating drum 501 extend outward to the inside of the silencer seat 6, and are connected to the silencer seat 6 on the surface through bearings 8, so that the rotating drum 501 can be positioned, and then the rotor 3 on the rotating drum 501 can be positioned, avoiding the rotor 3 from shaking inside the stator 2, and improving the rotation stability of the rotor 3. By providing the bearings 8, the friction between the rotating drum 501 and the silencer seat 6 can be reduced, thereby reducing noise. The bearings 8 are roller bearings.

[0036] like Figure 6As shown, the silencer seat 6 has a connecting end 601 connected to the exhaust tube 1, and the connecting end face is disc-shaped and fixed to the end face of the exhaust tube 1 by six bolts. The number of bolts can also be eight or one. The number of bolts is not limited here. Of course, the connection method of the silencer seat 6 is not limited to bolt connection, but can also be a snap connection. The silencer seat 6 also has a frustum 602. The end with a larger diameter of the frustum 602 is arranged on the connecting end 601 and is integrally formed with the connecting end 601. The end with a smaller diameter of the frustum 602 is integrally formed. A connecting tube 603 is formed and can be used to sleeve the pipe 7. Ventilation holes 604 are coaxially arranged on the cone 602, the connecting tube 603 and the connecting end 601. The ventilation holes 604 are circular and communicate with the interior of the rotating drum 501. The internal array of the cone 602 has several silencer holes 605, which can be used to reduce noise. One end of the silencer hole 605 is communicated with the interior of the ventilation hole 604, and the other end passes through the outside of the cone 602. A mounting groove 605 is provided on the end of the silencer seat 6 close to the exhaust tube 1. The mounting groove 605 can be used to install the bearing 8.

[0037] Since the bearing 8 rotates for a long time, the friction of the bearing 8 will increase. Figure 3 、 Figure 7 and Figure 8 As shown, an oil inlet hole 801 is provided on the outer ring of the bearing 8, and an oil inlet bin 802 is provided on the top of the oil inlet hole 801. The oil inlet bin 802 is surrounded by side walls. The oil inlet hole 801 and the interior of the oil inlet bin 802 are communicated. An arc-shaped swinging groove 6051 is provided on the mounting groove 605. The oil inlet bin 802 can move inside the swinging groove 6051, and two first elastic members 803 that can push the oil inlet bin 802 to the center are provided in the swinging groove 6051. Two oil filling holes 606 are provided on the cone 602. The two oil filling holes 606 are mirror-imaged and arranged on both sides of the oil inlet bin 802, and a one-way valve 9 is provided at the end of the oil filling hole 606 close to the bearing 8. When the oil inlet bin 802 moves to the one-way When the valve 9 is at the position, the oil inlet bin 802 can open the one-way valve 9, so that the lubricant in the oil filling hole 606 can enter the interior of the oil inlet bin 802. During use, when the friction of the bearing 8 becomes greater, the rotation of the inner ring of the bearing 8 will drive the outer ring of the bearing 8 to rotate on the mounting groove 605. The outer ring of the bearing drives the oil inlet bin 802 to contact the one-way valve 9, so that the one-way valve 9 opens, thereby injecting the lubricating oil in the oil filling hole 606 into the interior of the oil inlet bin 802, and can enter the interior of the bearing 8 through the oil inlet hole 801 to lubricate the bearing 8, thereby reducing friction. When the friction becomes smaller, the first elastic member 803 can cause the oil inlet bin 802 and the one-way valve 9 to be misaligned, so that the one-way valve 9 can be closed.

[0038] The first elastic member 803 is a compression spring, one end of which is fixed to the oil inlet bin 802 and the other end is fixed to one end of the swing slot 6051. When the oil inlet bin 802 moves inside the swing slot 6051, the first elastic member 803 is compressed, causing the first elastic member 803 to store energy. When the oil inlet bin 802 does not move, the elastic member 803 releases the energy, causing the oil inlet bin 802 to return to its original position.

[0039] like Figure 7 As shown, the one-way valve 9 is composed of a second elastic member 901 and a steel ball 902. The second elastic member 901 and the steel ball 902 are both arranged inside the oil filling hole 606. The steel ball 902 is arranged at one end of the oil filling hole 606 located at the bearing 8, and the steel ball 902 is limited by the limiting flange 903 to prevent the steel ball 902 from falling off from the oil filling hole 606. A part of the steel ball 902 is located outside the oil filling hole 606, so that when the oil inlet bin 802 moves, the steel ball 902 can be pushed into the oil filling hole 606. When the steel ball 902 is pushed into the oil filling hole 606, the lubricant can fall into the interior of the oil inlet bin 802 through the oil filling hole 606. When the steel ball and the limiting flange 903 come into contact, one end of the oil filling hole 606 can be sealed, so that the one-way valve 9 is in a closed state.

[0040] The second elastic member 901 is a compression spring, one end of which abuts against the steel ball 902 and the other end of which abuts against a stopper 904 disposed inside the oil filling hole 606. The stopper 904 is located at the end of the oil filling hole 606 away from the stopper flange 903 and allows the lubricating oil to pass through.

[0041] like Figure 8 As shown, the top of the oil inlet bin 802 is open, so that lubricant can enter the interior of the oil inlet bin 802 from the top. A counter-part 804 is integrally provided above the oil inlet bin 802. The counter-part 804 is slightly higher than the side wall of the oil inlet bin 802. When the oil inlet bin 802 slides inside the swing groove 6051, the counter-part 804 can push the steel ball 902 into the interior of the oil filling hole 606, thereby opening the one-way valve 9.

[0042] See also Figure 2 and Figure 5 , an oil storage tank 10 is installed on the exhaust cylinder 1, and the oil storage tank 10 can be fixed to the exhaust cylinder 1 by screws. The oil storage tank 10 is in the shape of a box, which can be square or running. In this embodiment, the shape of the oil storage tank 10 is not limited. An oil filling pipe 11 is provided on the oil storage tank 10, and the oil filling pipe 11 is communicated with the interior of the oil storage tank 10, and a small oil pump is provided inside the oil storage tank 10 to fill oil into the oil filling pipe 11. The end of the oil filling pipe 11 away from the oil storage tank 10 is connected to a branch pipe and an oil filling hole 606 through a tee joint. A connecting head 12 is provided on the oil filling hole 606, and the branch pipe can be inserted into the connecting head 12, so that the lubricating oil can enter the oil filling hole 606 through the oil filling pipe 11 and the branch pipe.

[0043] like Figure 6 and Figure 7 As shown, a notch 13 is provided on the connecting tube 603, and a mounting bracket 14 can be inserted into the notch 13. The mounting bracket 14 can be disassembled in the notch 13. A plurality of vents 16 are provided on the mounting bracket 14, and a mounting groove is provided inside. A silencer sponge 15 is provided inside the mounting groove. The silencer sponge 15 can be used to eliminate the noise of the exhaust fan and filter the air at the same time.

Claims

1. A silent duct exhaust fan, characterized in that: include: An exhaust tube (1), wherein a stator (2) and a rotor (3) are provided inside the exhaust tube (1), two stators (2) are provided on the exhaust tube (1), the rotor (3) rotates between the two stators (2) and rotates relative to the stator (2), a cavity (4) is provided inside the rotor (3), a fan component (5) is provided inside the cavity (4), so that when the rotor (3) rotates, the fan component (5) can be driven to rotate, and silencer seats (6) for eliminating noise are provided on both sides of the exhaust tube (1), and the silencer seats (6) can be used to position the rotation axis of the rotor (3); The fan component (5) comprises a rotating drum (501), the rotating drum (501) being connected to the inner wall of the cavity (4), and at least two fan blades (502) being arranged inside the rotating drum (501), and at least two of the fan blades (502) being connected at one end close to each other via a rotating shaft (503), and reinforcing columns (504) for improving the stability of the fan blades (502) being arranged at both ends of the rotating shaft (503); Both ends of the rotating drum (501) extend to the interior of the silencer seat (6) and are provided with bearings (8), and the outer ring of the bearing (8) is provided on the silencer seat (6); The muffler seat (6) includes a connecting end (601), the connecting end (601) can be connected to the end surface of the exhaust cylinder (1), a frustum (602) is provided on the side of the connecting end (601) away from the exhaust cylinder (1), the end of the frustum (602) with a smaller diameter is connected to the frustum (602), the end of the frustum (602) away from the connecting end (601) is provided with a connecting cylinder (603) for installing a pipe (7), a ventilation hole (604) communicating with the interior of the rotating cylinder (501) is provided on the connecting cylinder (603), a muffler hole (605) for suppressing noise is provided on the frustum (602), and a mounting groove (607) for installing a bearing (8) is provided on the end of the muffler seat (6) close to the exhaust cylinder (1); The bearing (8) is provided with an oil inlet hole (801) and an oil inlet bin (802) communicating with the interior of the oil inlet hole (801). The mounting groove (607) is provided with a swinging groove (6051). The oil inlet bin (802) is movable in the swinging groove (6051). A first elastic member (803) is provided in the swinging groove (6051) for centering the oil inlet bin (802). The cone (602) is provided with two oil filling holes (606) located on both sides of the oil inlet bin (802). A one-way valve (9) is provided at one end of the oil filling hole (606) close to the bearing (8). When the oil inlet bin (802) moves to the one-way valve (9), the one-way valve (9) can be opened to allow lubricating oil to enter the interior of the oil inlet bin (802).

2. A silent duct exhaust fan according to claim 1, characterized in that: The one-way valve (9) comprises a second elastic member (901) and a steel ball (902) arranged inside the oil filling hole (606); the steel ball (902) is located near the first end of the bearing (8) at the oil filling hole (606); a portion of the steel ball (902) is exposed outside the oil filling hole (606) through a limiting flange (903); and the second elastic member (901) can approach the limiting flange (903) through the steel ball (902).

3. A silent duct exhaust fan according to claim 2, characterized in that: The oil inlet bin (802) is provided with a counter-piece (804), which is higher than the side wall of the oil inlet bin (802). When the counter-piece (804) is located at the one-way valve (9), the steel ball (902) can be pressed against the inside of the oil filling hole (606).

4. The silent duct exhaust fan according to claim 1, characterized in that: An oil storage tank (10) is provided on the exhaust cylinder (1), and an oil filling pipe (11) is provided on the oil storage tank (10). The oil filling pipe (11) is connected to the oil filling hole (606) so that the oil filling hole (606) and the interior of the oil storage tank (10) are in communication. The oil storage tank (10) is also provided with an oil pump for pumping lubricating oil into the oil filling pipe (11).

5. The silent duct exhaust fan according to claim 1, characterized in that: The connecting tube (603) has a notch (13), a mounting frame (14) is provided in the notch (13), a sound-absorbing sponge (15) is provided in the mounting frame (14), and a vent (16) for air to pass through is provided on the mounting frame (14).

6. The silent duct exhaust fan according to claim 4, characterized in that: The silencer seat (6) is provided with a connector (12) located at the oil filling hole (606), and the oil filling pipe (11) can be inserted into the connector (12).

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