Single-motor double-fan-blade pipeline ventilating fan

Abstract

A single-motor double-fan-blade pipeline ventilating fan comprises an air duct, a motor base is coaxially installed on an inner hole of the air duct through a plurality of air guide wings, a driving motor is installed in the motor base, the front end and the rear end of the driving motor extend to form a front shaft and a rear shaft respectively, the front shaft and the rear shaft are connected with a front wind wheel and a rear wind wheel respectively, and when the driving motor rotates, the front wind wheel and the rear wind wheel rotate. The front wind wheel and the rear wind wheel are driven to rotate synchronously; the front air guide ring is mounted at the air inlet end of the air duct, and the rear air guide ring is mounted at the air outlet end of the air duct. The ventilating fan has the advantages that the ventilating fan is simple in design structure, the front wind wheel and the rear wind wheel are coaxially installed in the wind barrel, the front wind guide ring and the rear wind guide ring are installed at the wind inlet end and the wind outlet end of the wind barrel respectively, and complex functions are simplified. Due to the coaxial design of the motor and the wind wheel, the structure is simplified, the manufacturing and assembling difficulty is reduced, and the production cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of ventilation equipment, in particular to a single-motor double-blade duct ventilator. Background Art

[0002] In the field of ventilators, air volume and air pressure are two important parameters for measuring the ventilation capacity of ventilators. The air volume represents the amount of air passing through the ventilator per unit time, while the air pressure reflects the pressure exerted by the ventilator to push the air. In practical applications, the magnitudes of the air volume and air pressure directly determine the ventilation efficiency and effect of the ventilator. Therefore, improving the air volume and air pressure is an important goal in the design of ventilators. However, when the air volume and air pressure are the same, power and noise are the key indicators for measuring the energy consumption and comfort of ventilators. The lower the power, the smaller the energy consumption; the lower the noise, the better the user experience. Therefore, how to reduce power and noise while ensuring the ventilation capacity is an important issue in the design and manufacturing of ventilators.

[0003] In the actual manufacturing process, in order to obtain a larger air volume and air pressure on the premise that the diameter and the aerodynamic parameters of the fan blades have been optimized, the commonly used method is to increase the motor speed. By increasing the motor speed, the air volume and air pressure of the ventilator can be improved to a certain extent. However, the increase in the motor speed must be proportional to the increase in the air volume and air pressure, which means that the power of the motor needs to be significantly increased, thereby resulting in a significant increase in noise. Although this method is simple and direct, it has obvious defects and limitations.

[0004] First of all, the significant increase in the motor speed will lead to a significant rise in power, directly increasing the energy consumption, which does not meet the requirements of energy conservation and environmental protection. With the global emphasis on energy conservation and emission reduction, the market demand for low-power household appliances is increasing continuously, and high-energy-consuming products are gradually losing their competitiveness. Secondly, the significant increase in noise will seriously affect the comfort of users. Modern users' requirements for household appliances are not only powerful functions, but more importantly, the use experience, including low-noise operation. A ventilator with excessive noise will cause discomfort during use, especially in occasions where a quiet environment is required, such as bedrooms, studies, etc. Therefore, the method of significantly increasing the air volume and air pressure by increasing the motor speed is not feasible in practical applications.

[0005] In addition, too high a motor speed will also cause problems such as mechanical wear and shortened service life. When the motor operates at a high speed, the wear speed of its internal components accelerates, the failure rate increases, and the maintenance cost and repair frequency will also increase accordingly. This not only increases the user's usage cost, but also reduces the reliability of the product and user satisfaction. Therefore, it is necessary to make further improvements to it. Summary of the Utility Model

[0006] The object of the present utility model is to overcome the drawbacks of the existing technologies, and to provide a single-motor double-blade duct ventilator which is simple in structure, convenient to use, and can achieve a large air volume and air pressure without significantly increasing power and noise.

[0007] The object of the present utility model is achieved in the following way: A single-motor double-blade duct ventilator, which comprises a wind cylinder. An inner hole of the wind cylinder is coaxially provided with a motor seat through a plurality of air guide wings. A driving motor is installed in the motor seat. Front and rear shafts respectively extend from both ends of the driving motor, and are respectively connected to a front wind wheel and a rear wind wheel. When the driving motor rotates, it drives the front wind wheel and the rear wind wheel to rotate synchronously.

[0008] It further comprises a front air guide ring installed at the air inlet end of the wind cylinder, and a rear air guide ring installed at the air outlet end of the wind cylinder.

[0009] Furthermore: A plurality of the air guide wings are provided, which are distributed in a circumferential array and are connected to the inner wall of the wind cylinder and the outer wall of the motor seat.

[0010] Furthermore: The air guide wings extend in a circular arc shape along the axial direction, and their thickness gradually decreases from the windward end to the air outlet end.

[0011] Furthermore: A circular arc-shaped air guide arc surface protruding forward is provided at the windward end of the air guide wing.

[0012] Furthermore: The front air guide ring comprises a first air guide ring, a second air guide ring and a third air guide ring extending in the air outlet direction. The diameter of the second air guide ring is smaller than that of the first air guide ring and the third air guide ring. The inner surfaces of the first air guide ring, the second air guide ring and the third air guide ring are connected by an arc transition, forming an airfoil section protruding towards the inner direction of the hole.

[0013] Furthermore: An arc-shaped trumpet-shaped air inlet area with a large outer and a small inner is formed between the first air guide ring and the second air guide ring, and an arc-shaped trumpet-shaped air outlet area with a large outer and a small inner is formed between the second air guide ring and the third air guide ring.

[0014] Furthermore: Both the front wind wheel and the rear wind wheel comprise a diversion cover protruding in a circular arc shape, and a plurality of fan blades are distributed on the surface of the diversion cover. The cross section of the fan blade is set as an airfoil shape.

[0015] Furthermore: The thickness of the fan blade gradually decreases from the windward end to the air outlet end.

[0016] Furthermore: The rear air guide ring comprises an inner ring and an outer ring, and the inner ring and the outer ring are connected by a plurality of rear wings.

[0017] Furthermore: A plurality of the rear wings are provided, which are distributed in an annular array, and the cross section of the rear wing is set as a circular arc shape.

[0018] The beneficial effects of the present utility model are as follows: 1. The structure is simple, the production cost is low, and the market competitiveness is improved.

[0019] 2. The ventilation fan of the present utility model has a simple design structure. By coaxially installing two wind wheels, one in the front and the other in the back, inside the air duct, and respectively installing a front air guide ring and a rear air guide ring at the air inlet end and the air outlet end of the air duct, the realization of complex functions is simplified. The coaxial design of the motor and the wind wheel not only simplifies the structure, but also reduces the manufacturing and assembly difficulties and lowers the production cost.

[0020] 3. Through the design of synchronous rotation of the double fan blades, the present utility model can significantly increase the air volume and air pressure of the ventilation fan under the condition of similar power. The reasonable layout of the front and rear wind wheels and the auxiliary function of the front and rear air guide rings make the air flow smoother, reduce the air resistance, and thus improve the overall ventilation efficiency. Compared with the traditional single wind wheel design, the double fan blade structure of the present utility model can provide stronger air power to meet the actual needs of efficient ventilation.

[0021] 4. Without significantly increasing the motor speed, the ventilation fan of the present utility model realizes the improvement of air volume and air pressure through structural optimization. Since the motor speeds are similar, the noise will not increase significantly, maintaining a relatively low operating noise level. The design of the air guide wings not only improves the air dynamic performance, but also plays a role in noise reduction to a certain extent, enhancing the user's comfort.

[0022] 5. In terms of design, the present utility model fully considers the rationality of power and volume. While increasing the air volume and air pressure, the double fan blade structure does not significantly increase the power requirement of the motor, meeting the requirements of energy conservation and environmental protection. In addition, the overall size of the ventilation fan does not increase, making it suitable for various installation environments, not occupying too much space, and facilitating user installation and use.

[0023] 6. By optimizing the structure and air flow management, the ventilation fan of the present utility model solves the problem that traditional ventilation fans need to significantly increase the motor speed to improve the air volume and air pressure. While maintaining a low noise and power level, it significantly improves the ventilation performance, meeting the actual needs of users for high-efficiency, low-noise, and energy-saving ventilation fans, and having a broad market application prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 、 2 is the overall assembly effect diagram of the structure of the present utility model.

[0025] Figure 3 、 4 is the exploded view of the structure of the present utility model.

[0026] Figure 5 is the sectional view of the structure of the present utility model.

[0027] Figure 6 This is a cross-sectional view of the air duct structure in the present utility model.

[0028] Figure 7 This is a cross-sectional view of the air guiding wing structure in the present utility model.

[0029] Figure 8 This is a schematic diagram of the front air guiding ring structure in the present utility model.

[0030] Figure 9 This is a cross-sectional view of the front air guiding ring structure in the present utility model.

[0031] Figure 10 、 11 This is a schematic diagram of the front air wheel structure in the present utility model.

[0032] Figure 12 This is a schematic diagram of the rear air guiding ring structure in the present utility model.

[0033] Figure 13 This is a cross-sectional view of the rear wing structure in the present utility model.

[0034] Explanation of reference numerals in the drawings: 1 - air duct; 2 - air guiding wing; 21 - air guiding arc surface; 3 - motor base; 4 - driving motor; 41 - front shaft; 42 - rear shaft; 5 - front air wheel; 51 - air guide cover; 52 - fan blade; 6 - rear air wheel; 7 - front air guiding ring; 71 - first air guiding ring; 72 - second air guiding ring; 73 - third air guiding ring; 74 - air inlet area; 75 - air outlet area; 8 - rear air guiding ring; 81 - inner ring; 83 - rear wing. Detailed implementation manners

[0035] The following further specifically describes the present utility model with reference to the drawings. A single-motor double-fan blade duct ventilation fan includes an air duct 1. An inner hole of the air duct 1 coaxially mounts a motor base 3 through a plurality of air guiding wings 2. A driving motor 4 is installed in the motor base 3. The front and rear ends of the driving motor 4 respectively extend out a front shaft 41 and a rear shaft 42, which are respectively connected to a front air wheel 5 and a rear air wheel 6. When the driving motor 4 rotates, it drives the front air wheel 5 and the rear air wheel 6 to rotate synchronously;

[0036] It further includes a front air guiding ring 7 installed at the air inlet end of the air duct 1, and a rear air guiding ring 8 installed at the air outlet end of the air duct 1.

[0037] In one embodiment: A plurality of the air guiding wings 2 are provided, which are distributed in a circumferential array and are connected to the inner wall of the air duct 1 and the outer wall of the motor base 3.

[0038] In one embodiment: The air guiding wing 2 extends in a circular arc shape along the axial direction, and its thickness gradually decreases from the windward end to the air outlet end.

[0039] In one embodiment: The windward end of the air guiding wing 2 is provided with an air guiding arc surface 21 that protrudes forward in an arc shape.

[0040] In one embodiment: The front air guiding ring 7 includes a first air guiding ring 71, a second air guiding ring 72, and a third air guiding ring 73 that extend in the air outlet direction. The diameter of the second air guiding ring 72 is set smaller than that of the first air guiding ring 71 and the third air guiding ring 73. The inner surfaces of the first air guiding ring 71, the second air guiding ring 72, and the third air guiding ring 73 are connected in an arc transition, forming an airfoil section that protrudes in the direction of the hole.

[0041] In one embodiment: An arc-shaped trumpet-shaped air inlet area 74 with a large outer and small inner shape is formed between the first air guiding ring 71 and the second air guiding ring 72, and an arc-shaped trumpet-shaped air outlet area 75 with a large outer and small inner shape is formed between the second air guiding ring 72 and the third air guiding ring 73.

[0042] In one embodiment: Both the front wind wheel 5 and the rear wind wheel 6 include a guide cover 51 that protrudes in an arc shape, and a plurality of fan blades 52 are distributed on the surface of the guide cover 51. The cross-section of the fan blade 52 is set in an airfoil shape.

[0043] In one embodiment: The thickness of the fan blade 52 is gradually reduced from the windward end to the air outlet end.

[0044] In one embodiment: The rear air guiding ring 8 includes an inner ring 81 and an outer ring 82, and the inner ring 81 and the outer ring 82 are connected by a plurality of rear wings 83.

[0045] In one embodiment: A plurality of the rear wings 83 are provided and are distributed in an annular array. The cross-section of the rear wing 83 is set in an arc shape.

[0046] Working principle: The exhaust fan of the present utility model mainly includes an air duct 1, an air guiding wing 2, a motor base 3, a driving motor 4, a front shaft 41, a rear shaft 42, a front wind wheel 5, a rear wind wheel 6, a front air guiding ring 7, and a rear air guiding ring 8.

[0047] Among them, as Figure 6 shown, a motor base 3 is coaxially installed on the inner hole of the air duct through a plurality of air guiding wings 2. While the air guiding wings play a role in connecting the motor base, they also play a role in forming an air duct between the motor base and the inner hole of the air duct, reducing the cross-sectional area of the ventilation section formed in the space between the front wind wheel and the rear wind wheel, increasing the air flow velocity relative to the air flow velocity at the air inlet end, reducing the fluid pressure, and making the air discharged by the front wind wheel flow into the rear wind wheel more smoothly. Among them, the air guiding wings also play a role in guiding the air flow to form an orderly flow in the air duct, reducing turbulence and resistance. The windward end of the air guiding wing is provided with an air guiding arc surface that protrudes forward in an arc shape, further optimizing the air flow guidance, reducing the air flow resistance, and improving the ventilation efficiency.

[0048] When the drive motor is powered on and starts, the front axle 41 and the rear axle 42 rotate simultaneously, driving the front wind wheel 5 and the rear wind wheel 6 to rotate synchronously. The synchronous propulsion of the air flow is achieved. The front wind wheel is located at the air inlet end of the air duct, and the rear wind wheel is located at the air outlet end. The two work together to form an efficient air flow channel. The rear wind wheel can further increase the air flow velocity, thereby increasing the air volume, and the air pressure will be further increased.

[0049] Under the condition of the same ventilation diameter, the same front mixed-flow fan blades are used, and the same type of motor with the same energy efficiency ratio (shaded-pole motor) is used. Compared with the original, the air pressure is increased by 22.99 Pa (46.64%), the air volume is increased by 5.2 m³ (5.59%), the motor temperature rise is reduced by 7.6 K (-14.59%), the input power is increased by 1.7 W, and the noise is only increased by 2.8 Db. The increased air pressure can make the air better discharged outdoors. When it is applied to a long pipeline or when there is air backflow at the outdoor exhaust end, the greater air pressure can ensure that it continues to maintain a good exhaust effect. According to the principle of conservation of energy, the input electrical energy is converted into kinetic energy (air volume), potential energy (air pressure), and temperature rise (heat energy). This solution can greatly increase the potential energy of the air, increase the kinetic energy, reduce the heat energy loss, and achieve energy conservation and efficiency improvement.

[0050] Furthermore, as Figure 8 、 9 shown, the leading air guide ring 7 in this case is installed at the air inlet end of the air duct, and includes a first air guide ring 71, a second air guide ring 72, and a third air guide ring 73. These air guide rings extend sequentially in the air outlet direction. The diameter of the second air guide ring is smaller than that of the first and third air guide rings, forming multiple arc transitions. According to Bernoulli's principle formula: p + 1 / 2ρv² + ρgh = C, where p is the pressure at a certain point in the fluid, v is the vector flow velocity of the fluid at that point, ρ is the fluid density, g is the acceleration due to gravity, h is the height of that point, and C is a constant. As Figure 9 shown, according to Bernoulli's principle, when air flows through the airfoil-shaped air guide ring, the air flow velocity V increases, ρ remains unchanged, and H remains unchanged, so P decreases, generating a pressure difference between the air inlet area and the air outlet area of the leading air guide ring. This helps to optimize the air flow path and allows the air to enter the fan body flow channel more smoothly. And the cross-section of the leading air guide ring in this case is airfoil-shaped. According to Bernoulli's principle, when the air flow passes through the airfoil-shaped cross-section, the air flow rate will increase, and the air can enter the fan body flow channel more smoothly and the air volume will increase.

[0051] As Figure 10 、 11 shown, both the front wind wheel and the rear wind wheel include a guide cover, on the surface of which there are several fan blades 52. The cross-section of the fan blade is airfoil-shaped and the thickness gradually decreases from the windward end to the leeward end, which can reduce the adverse factors of turbulent flow and eddy current. Such a design can enable the fan blade to obtain greater thrust, making the fan blade more efficiently push the air during rotation, forming a stable air flow, and improving the overall performance of the exhaust fan.

[0052] Furthermore, the fan blades extend in an arc shape along the axial direction, forming a mixed-flow air supply structure. Compared with a pure axial-flow structure, the mixed-flow structure can generate centrifugal force and have a greater wind pressure while ensuring the performance of a similar large axial-flow air volume.

[0053] Furthermore, as Figure 12 described, in this case, a rear air guide ring 8 is also installed at the air outlet end of the air duct. It includes an inner ring 81 and an outer ring 82, which are connected by a number of rear wings 83. The rear wings are distributed in a circular array, and their cross-sections are arc-shaped, which helps to optimize the air outlet path. In addition, air fluid is viscous. When flowing through an object with a certain cross-sectional shape, the flow direction of the fluid will change. Therefore, when air passes through the rear air guide ring, under the guiding action of the rear wings: 1. The discharged air is parallel to the axis, reducing pipe loss, making the discharged air blow farther, and enhancing the effective ventilation capacity. 2. The rear air guide vanes with airfoil design can increase the air volume and wind pressure, and the effective ventilation capacity is enhanced again.

[0054] In summary, through reasonable structural design and air flow optimization, the present utility model realizes a significant improvement in the air volume and wind pressure of the exhaust fan while the power is close and the motor speed is similar, and at the same time maintains a low noise level. This design not only improves the performance of the exhaust fan, but also meets the actual needs of modern users for high efficiency, low noise, energy conservation and environmental protection, so it can be widely promoted and used.

[0055] Obviously, the above embodiments are only examples for clear illustration and not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the claims of the present utility model.

Claims

1. A single-motor double-blade duct ventilation fan, characterized in that: It comprises a wind tube (1), a motor seat (3) is coaxially mounted on the inner hole of the wind tube (1) via a plurality of wind guide wings (2), a driving motor (4) is mounted in the motor seat (3), a front shaft (41) and a rear shaft (42) are respectively extended from the front and rear ends of the driving motor (4), and are respectively connected to the front wind wheel (5) and the rear wind wheel (6), and when the driving motor (4) rotates, the front wind wheel (5) and the rear wind wheel (6) are driven to rotate synchronously; It also includes a front air guide ring (7) installed at the air inlet end of the air duct (1), and a rear air guide ring (8) installed at the air outlet end of the air duct (1).

2. A single-motor double-blade duct ventilation fan according to claim 1, characterized in that: The wind guide wings (2) are provided with a plurality of pieces, which are distributed in a circular array and are connected to the inner wall of the wind tube (1) and the outer wall of the motor base (3).

3. A single-motor double-blade duct ventilation fan according to claim 2, characterized in that: The wind guide wing (2) extends in an arc shape along the axial direction, and its thickness gradually decreases from the windward end to the wind outlet end.

4. A single-motor double-blade duct ventilation fan according to claim 3, characterized in that: The windward end of the wind guide wing (2) is provided with a circular arc-shaped wind guide arc surface (21) protruding forward.

5. The single-motor double-blade duct ventilation fan according to claim 1, characterized in that: The front air guide ring (7) comprises a first air guide ring (71), a second air guide ring (72) and a third air guide ring (73) extending in the air outlet direction, the diameter of the second air guide ring (72) being smaller than the diameters of the first air guide ring (71) and the second air guide ring (72), and the inner surfaces of the first air guide ring (71), the second air guide ring (72) and the third air guide ring (73) are connected in a circular arc transition to form an airfoil-shaped cross section protruding in the direction of the hole.

6. A single-motor double-blade duct ventilation fan according to claim 5, characterized in that: A circular-arc trumpet-shaped air inlet area (74) with a larger outside and a smaller inside is formed between the first air guide ring (71) and the second air guide ring (72), and a circular-arc trumpet-shaped air outlet area (75) with a larger outside and a smaller inside is formed between the second air guide ring (72) and the third air guide ring (73).

7. A single-motor double-blade duct ventilation fan according to claim 1, characterized in that: The front wind wheel (5) and the rear wind wheel (6) both comprise a guide cover (51) with a circular arc protrusion, and a plurality of fan blades (52) are distributed on the surface of the guide cover (51). The cross section of the fan blades (52) is wing-shaped.

8. A single-motor double-blade duct ventilation fan according to claim 7, characterized in that: The thickness of the fan blade (52) is gradually reduced from the windward end to the wind outlet end.

9. The single-motor double-blade duct ventilation fan according to claim 1, characterized in that: The rear air guide ring (8) comprises an inner ring (81) and an outer ring (82), and the inner ring (81) and the outer ring (82) are connected via a plurality of rear wings (83).

10. A single-motor double-blade duct ventilation fan according to claim 9, characterized in that: The rear wing (83) is provided with a plurality of pieces distributed in a ring array, and the cross section of the rear wing (83) is arranged in an arc shape.

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