WO2016061747A1

WO2016061747A1 - Diagonal flow fan

Info

Publication number: WO2016061747A1
Application number: PCT/CN2014/089118
Authority: WO
Inventors: 何曙华; 陈卫东
Original assignee: 广东泛仕达机电有限公司
Priority date: 2014-10-22
Filing date: 2014-10-22
Publication date: 2016-04-28
Also published as: EP3211247A4; EP3211247A1; CN106471259A; EP3211247B1; US20170045060A1

Abstract

A diagonal flow fan, comprising an airflow duct (8), a motor (6), an impeller (2), a blade (4), an airflow guide ring (1) and a hub (3); one end of the airflow guide ring (1) is connected to the airflow duct (8); the blade (4) and the hub (3) are located inside the impeller (2); one end of the blade (4) is connected to the hub (3), and the other end is connected to the impeller (2); the motor (6) is located inside and connected to the hub (3); the other end of the airflow guide ring (1) is located at an inner side of the impeller (2), and a gap exists between the airflow guide ring (1) and the impeller (2); a motor shaft matches the impeller (2), employing a concentric positioning configuration; and a balance component (9) is fixedly installed at a peripheral surface of the impeller (2), thereby achieving dynamic balancing. The diagonal flow fan has a compact structure and a dramatically improved overall efficiency.

Description

Diagonal flow fan

Technical field

The invention relates to a ventilation device, in particular to a diagonal flow fan.

Background technique

As shown in FIG. 1 and FIG. 2, the prior art diagonal flow fan includes a motor 6, a wind wheel 2, a blade 4, a balance member 9, and a balance member 9 for maintaining the balance of the diagonal flow fan is fixedly mounted on the blade 4. Poor dynamic balance results in low-efficiency, high noise, and difficult to adjust the dynamic balance. At the same time, there is no air guiding ring on the air inlet cover of the prior art diagonal flow fan, which results in large air loss at the air inlet of the air inlet cover and low energy efficiency of the fan.

In addition, due to the European Union's energy-related product design standard requirements (ErP Directive) was released in 2009, it aims to require energy-consumption products to meet the design requirements of 20-20-20 for environmental protection, that is, to reduce energy consumption by 20% by 2020. And 20% of the materials used are from renewable sources.

The European Union has set minimum energy efficiency standards for different types of wind turbines ranging from 0.125 kW to 500 kW. The basis for these standards is the type of fan, the measuring device and the electrical power consumed. The standard requires two steps to be implemented in 2013 and 2015. The new standard ERP2015 requires full implementation of the ErP directive in 2015, and the energy efficiency requirements of the wind turbine will be more stringent.

According to the European Union, the standard energy efficiency calculation formula for a diagonal flow fan with a power range of 0.125 KW to 10 kW is:

Minimum energy efficiency η _min =4.56×Ln(P)-10.5+N](%)

among them:

P is the input power in kilowatts.

N is a constant, EU regulations: N in the energy efficiency indicator for 2013 is 47, and N in the 2015 energy efficiency indicator is 50.

Based on this calculation, the energy efficiency limit of the European Union's ErP directive is quite demanding. Even in the first phase, 30% of all current wind turbines will not meet the new regulations. With the implementation of the second phase starting in 2015, 20% of current products will not meet energy efficiency requirements.

Summary of the invention

The technical problem to be solved by the present invention is to provide a compact and efficient diagonal flow fan.

In order to solve the above technical problem, the technical solution of the present invention is:

A diagonal flow fan includes a air cylinder, a motor, a wind wheel, a blade, a wind guide ring, and a hub, wherein one end of the air guiding ring is connected to the air cylinder; the blade and the hub are located inside the wind wheel, One end of the blade is connected to the hub, the other end is connected to the wind wheel; the motor is located inside the hub, the motor is connected to the hub; the other end of the air guiding ring is located inside the wind wheel There is a gap between the air guiding ring and the wind wheel.

Optionally, the air guiding ring has a trumpet shape, and one end of the air guiding ring connected to the air cylinder is externally expanded.

Optionally, the dimension S of the gap is: 0 < S ≤ 10 mm.

Optionally, the outer peripheral surface of the wind wheel is fixedly mounted with a balance member for maintaining the dynamic balance of the fan.

Optionally, the balance member is a balance stud.

Optionally, the blade is integral with the hub.

Optionally, the blade is provided with a protrusion that is caught in the slot of the wind wheel, and the protrusion and the wind wheel are welded by an ultrasonic process.

Optionally, the motor is an outer rotor motor, and an outer rotor shaft of the motor is sleeved in the central hole of the hub.

Optionally, a steel ring is further included, the steel ring being fixedly coupled to the motor and the hub, respectively.

Optionally, the steel ring is fixedly connected to the hub by screws, and the steel ring is fixedly connected to the motor by riveting and/or welding.

As can be seen from the above technical solutions, the present invention has the following advantages:

An embodiment of the present invention provides a diagonal flow fan, including a air cylinder, a motor, a wind wheel, a blade, a wind guide ring, and a hub. wherein a gap exists between the wind wheel and the air guide ring, and the air flow is guided through the gap. The airflow of the ring controls the size of the gap to reduce the return loss of the airflow and improve the working efficiency of the fan. The smaller the gap, the higher the efficiency.

Further, the balance member is fixedly mounted on the outer peripheral surface of the wind wheel to realize the dynamic balance of the diagonal flow fan, and the problem of low balance efficiency and poor dynamic balance of the diagonal flow fan in the prior art is solved.

Further, the use of ultrasonic welding of the blade and the wind wheel solves the current poor appearance of the hot-melt welding. The problem is to avoid the sol from flying out during welding and causing debris to fall into the fan.

Further, the outer rotor and the steel ring of the motor are riveted and/or welded, the steel ring is not easy to fall off, and the motor shaft and the wind wheel are matched with a concentric positioning design, which solves the excessive dynamic imbalance caused by the poor concentricity of the wind wheel and the steel ring assembly. The problem.

DRAWINGS

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

Figure 1 is a structural view of a prior art diagonal flow fan;

2 is a structural view of a blade and a balance piece in a prior art diagonal flow fan;

Figure 3 is an exploded view of an embodiment of the diagonal flow fan of the present invention;

Figure 4 is a structural view of the diagonal flow fan of Figure 3 after assembly;

Figure 5 is a cross-sectional view showing the structure of the diagonal flow fan of Figure 3 after assembly;

Figure 6 is a schematic view showing the cooperation of the wind turbine of the oblique flow fan and the air guiding ring of Figure 3;

Figure 7 is a schematic view showing the position of the balance member of the diagonal flow fan of Figure 3.

The reference numerals are as follows:

1—wind guide ring; 2—wind wheel; 3—wheel hub; 4—blade; 5-steel ring; 6—motor; 7—back guide vane; 8—air duct;

detailed description

The basic idea of the present invention is to provide a diagonal flow fan for solving the technical problem of low efficiency of the prior art diagonal flow fan. The diagonal flow fan of the present invention includes a air cylinder, a motor, a wind wheel, a blade, and an air guide. One end of the ring, the hub and the air guiding ring are connected with the air cylinder; the blade and the hub are located inside the wind wheel, one end of the blade is connected with the hub, and the other end is connected with the wind wheel; the motor is located inside the hub, the motor is connected with the hub; the other end of the air guiding ring is located Inside the wind wheel, there is a gap between the air guiding ring and the wind wheel.

In order to make the object, the features and the advantages of the present invention more obvious and easy to understand, the technical solutions in the embodiments of the present invention will be clearly described below with reference to the accompanying drawings in the embodiments of the present invention. Throughout the description, it is apparent that the described embodiments are only a part of the embodiments of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 3 to FIG. 7 , a diagonal flow fan provided by the present invention, one of the embodiments includes:

The air cylinder 8, the motor 6, the wind wheel 2, the blade 4, the air guiding ring 1, the hub 3, one end of the air guiding ring 1 is connected with the air cylinder 8; the blade 4 and the hub 3 are located inside the wind wheel 2, one end of the blade 4 and the hub 3 The other end is connected to the wind wheel 2; the motor 6 is located inside the hub 3, the motor 6 is connected to the hub 3; the other end of the air guiding ring 1 is located inside the wind wheel 2, and there is a gap between the air guiding ring 1 and the wind wheel 2. It should be noted that, in this embodiment, the air guiding ring 1 and the air cylinder 8 are electrically welded. In other embodiments, the air guiding ring 1 and the air cylinder 8 may be fixedly connected by other connection methods.

As shown in FIG. 5 and FIG. 6, the air guiding ring 1 of the oblique flow fan has a trumpet-like structure, the bell mouth is outward, and one end of the air guiding ring 1 is outwardly expanded, and the end is formed with an everted curling edge, and the other end is located at the wind wheel. On the inner side of the second side, the outer turn of the outer side of the air guiding ring 1 is connected to the air cylinder 8, and the air guiding ring 1 can be increased to reduce the air loss, thereby increasing the air volume and improving the efficiency of the diagonal flow fan; The expansion of the ring 1 to the outside makes the air guiding effect better, thereby improving the overall performance of the diagonal flow fan.

As shown in FIG. 6, the other end of the air guiding ring 1 is located inside the wind wheel 2, and there is a gap between the wind wheel 2, and the gap size S is: 0 < S ≤ 10 mm. Controlling the gap size can reduce the backflow of the air flow. Loss, thereby improving the energy efficiency of the fan; the smaller the gap, the higher the efficiency of the fan. After repeated tests, the optimal gap size of the air guide ring 1 and the wind wheel 2 is 2.5 mm, and the energy efficiency is 6-8 percentage points higher than the ERP2015 requirement.

It should be noted that in the present embodiment, the blade 4 and the hub 3 adopt an integral structure, which is mainly formed by injection molding to prevent looseness between the blade 4 and the hub 3.

As shown in FIG. 4, in the present embodiment, the blade 4 and the hub 3 are disposed inside the wind wheel 2, and the blade 4 is provided with a protrusion, and the wind wheel 2 is provided with a card slot engaged with the protrusion of the blade 4, the blade The protrusion of 4 can be inserted into the slot of the wind wheel 2, and the blade 4 is fixedly connected with the wind wheel 2. The protrusion is inserted into the slot of the wind wheel 2, and then ultrasonic welding is used to weld the part of the wind wheel near the periphery of the card slot. The fixing of the two is more secure; the number of the blades 4 is two or more, and the plurality of blades 4 are twisted in the same direction, and the twisting direction is almost the same as the direction of rotation of the wind wheel.

As shown in FIG. 7, the balance member 9 is disposed within 360 degrees of the outer circumferential surface of the rotor 2 to achieve dynamic balance. In the present embodiment, the balance is achieved by installing the balance nails 9 in the range of 360 degrees on the upper and lower sides of the outer circumferential surface of the wind wheel 2, and the balance nails 9 can be provided in plurality according to the need for dynamic balance. In the embodiment, the balancing nail is used to realize the dynamic balance, which solves the problem that the prior art oblique flow adopts the balance clip and has low efficiency and poor dynamic balance. The prior art diagonal flow fan has a dynamic balance efficiency of 10-20 minutes/set, and the balance piece needs 8-12 pieces. In the diagonal flow fan of this embodiment, the efficiency is 3 to 5 minutes/set, and the balance nails need 4 to 6.

In this embodiment, the balance nail is used as the balance component. It can be understood that in other embodiments, other balance components such as a balance clamp and a balance pin may be used to realize the dynamic balance of the diagonal flow fan.

As shown in FIG. 4 and FIG. 5, the top end of the hub 3 is provided with five holes, one of which is located at the center of the hub 3, and the outer rotor shaft of the motor is sleeved in the central hole of the hub to realize the concentric positioning design of the motor shaft and the wind wheel. . The steel ring 5 is fixed on the hub 3, and the inner wall of the hub 3 is provided with reinforcing ribs for supporting the steel ring 5 and the motor 6; the fixing manner of the hub 3 and the steel ring 5 is screw connection; the rotor of the steel ring 5 and the motor 6 is adopted Riveted and / or welded to avoid the steel ring off. In addition, due to the concentric positioning design of the motor shaft and the wind wheel, the problem of excessive dynamic imbalance caused by poor concentricity of the wind wheel and the steel ring assembly is solved. The rotor of the motor 6 adopts an electrophoretic spraying process to prevent the rotor from rusting and reduce the service life of the motor.

As shown in FIG. 5, the motor 6 is designed with an outer rotor motor, and the outer rotor motor 6 is mounted inside the hub 3. The outer rotor shaft of the motor 6 is mounted in the central hole of the hub 3, and the motor shaft and the wind wheel 2 are coordinated with each other. The positioning design avoids the problem of excessive dynamic balance caused by the poor concentricity of the wind wheel 2 and the steel ring 5 assembly. In the prior art oblique flow fan, the initial imbalance of the wind turbine is 5-10 g, and the initial unbalance of the wind turbine of the diagonal flow fan in this embodiment is 2 to 4 grams.

As shown in FIG. 5, the shape of the hub 3 is changed from a cylindrical shape to a conical shape from a direction away from the air guiding ring 1 to a direction close to the air guiding ring 1. The middle portion of the rear vane 7 is fixedly coupled to the motor 6, and the rear end portion of the rear vane 7 is connected to the air cylinder 8, and the rear vane 7 is concentrically nested with the air cylinder 8 and both are fastened by screws.

According to the European Union, the standard energy efficiency formula for a diagonal flow fan with a power range of 0.125 KW to 10 kW is: minimum energy efficiency η _min = 4.56 × Ln (P) - 10.5 + N (%)

Where P is the input power in kilowatts and N is a constant. The N in the 2013 energy efficiency indicator is 47; the N in the 2015 energy efficiency indicator is 50.

The actual energy efficiency is based on the efficiency at static pressure. The calculation formula of actual energy efficiency is:

Actual energy efficiency η _{static pressure} = static pressure (Pa) × flow rate (m ³ / s) / power (W) X100%

Since the flow rate of the general test fan air volume is: m ³ / hour (m ³ /h), when calculating the actual energy efficiency at static pressure, the flow unit needs to be converted into: m ³ / s (m ³ / s).

The energy efficiency index test and calculation are respectively carried out for the prior art diagonal flow fan with a diameter of 10 inches and 12 inches and a diagonal flow fan using the above structure. The test results are as follows:

Table 1 Comparison of actual energy efficiency values of existing diagonal flow fans with minimum energy efficiency requirements of EU standards

Table 2 Comparison of the actual energy efficiency value of the diagonal flow fan of the present invention with the minimum energy efficiency requirement of the EU standard

Table 3 Comparison of actual energy efficiency values of the diagonal flow fan of the present invention and the existing diagonal flow fan

It can be seen from the above test and calculation results that the improved diagonal flow fan provided by the present invention has significantly improved energy efficiency compared with the prior art oblique flow fan, and meets the EU energy efficiency standard (Data in According to ErP Directive 327/2011 of the European Parliament).

The oblique flow fan provided by the present invention has been described in detail above. The principles and embodiments of the present invention are described in detail by using specific examples. The description of the above embodiments is only for helping to understand the method of the present invention and its core idea. It should be noted that those skilled in the art can make various modifications and changes to the present invention without departing from the spirit and scope of the invention.

Claims

A diagonal flow fan includes a air cylinder, a motor, a wind wheel, a blade, a wind guide ring, and a hub, wherein one end of the air guiding ring is connected to the air cylinder; the blade and the hub are located inside the wind wheel, One end of the blade is connected to the hub, and the other end is connected to the wind wheel; wherein the motor is located inside the hub, the motor is connected to the hub; and the other end of the air guiding ring is located at the Inside the wind wheel, there is a gap between the air guiding ring and the wind wheel.
The diagonal flow fan according to claim 1, wherein the air guiding ring has a flared shape, and one end of the air guiding ring connected to the air cylinder is expanded outward.
The diagonal flow fan according to claim 1, wherein the size S of the gap is: 0 < S ≤ 10 mm.
The diagonal flow fan according to any one of claims 1 to 3, characterized in that the outer peripheral surface of the wind wheel is fixedly mounted with a balance member for maintaining the dynamic balance of the fan.
A diagonal flow fan according to claim 4, wherein said balancing member is a balance nail.
The diagonal flow fan of claim 1 wherein said vane is integral with said hub.
The diagonal flow fan according to claim 1, wherein the blade is provided with a protrusion, the protrusion is caught in a slot of the wind wheel, and the protrusion is welded to the wind wheel by an ultrasonic process.
The diagonal flow fan of claim 1 wherein said motor is an outer rotor motor and an outer rotor shaft of said motor is nested within a central bore of said hub.
A diagonal flow fan according to claim 1, further comprising a steel ring, said steel ring being fixedly coupled to said motor and said hub, respectively.
The diagonal flow fan according to claim 9, wherein the steel ring and the hub are fixedly connected by screws, and the steel ring is fixedly connected to the motor by riveting and/or welding.