KR101548964B1

KR101548964B1 - Blades for Large Axial Flow Fans

Info

Publication number: KR101548964B1
Application number: KR1020150048644A
Authority: KR
Inventors: 최인석
Original assignee: 주식회사 써모시스
Priority date: 2015-04-06
Filing date: 2015-04-06
Publication date: 2015-09-01

Abstract

The present invention relates to a blade for a large axial air blower to separate and manufacture a portion of a blade and assembling a portion of the blade on an installation site to reduce a transfer volume and, more specifically, forming a lightweight perforating mesh and coating carbon fiber on the blade when the blade is manufactured to increase durability and reduce weight. According to the present invention, a plurality of blades is radially coupled with an external circumference of a rotor in the blade for a large axial air blower. A center of each blade is divided into a first wing member and a second wing member; the first wing member is formed by bending a first perforating mesh to be shaped in a blade, heating and compressing a plurality of carbon sheets on a surface of the first wing member; and the second wing member is formed by bending a second perforating mesh to be shaped in the blade, heating and compressing a plurality of carbon sheets on a surface of the second wing member. Moreover, the first wing member includes a wing axis coupled with an external circumference of the rotor.

Description

{Blades for Large Axial Flow Fans}

More particularly, the present invention relates to a blade for a large axial flow blower, and more particularly, to a method of manufacturing a blade for a large axial flow blower, The present invention relates to a blade for a large-sized axial flow blower, which is coated with carbon fibers in multiple layers to improve durability and light weight.

In general, the blower has a wide range of applications, such as general manufacturing processes, power generation facilities and boiler air supply, mine and tunnel air supply and exhaust, and air conditioning of buildings. It is a machine. These axial flow fans are divided into propeller type, tube type, and vane type using the lift of the rotor (axial fan) when the gas flowing in the axial direction flows out. have. The blades of the axial flow blower are disclosed in Korean Patent Publication No. 10-525481 and Korean Patent Laid-Open Publication No. 10-2005-67872.

Conventionally, blades of conventional blowers are mostly manufactured by injection molding or metal casting. However, these methods have a disadvantage in that the manufacturing cost is increased since the mold frame must be manufactured first, and the weight of the blade is increased as the mold is made thicker. In the case of a large-sized blower, the length of one blade is more than 1000 mm, which makes the blower bulky as a whole, making it difficult to store and transport.

In view of this, Japanese Patent Application Laid-Open No. 2014-0061302 has proposed a rotor structure for an axial flow turbine having a plurality of separately installable rotor blades. This is configured such that the rotor blades are divided and assembled to the rotor.

However, since the conventional patent publication No. 2014-0061302 is manufactured by a metal casting method, it takes much time to assemble the divided rotors in the field because the weight is large and the rotors are divided. Especially, It is difficult to precisely control the assembly tolerance since vibration occurs in the blower due to eccentricity with the rotary shaft.

SUMMARY OF THE INVENTION The present invention has been developed in consideration of the conventional problems, and it is an object of the present invention to provide a method of manufacturing a blade by separating a part of a blade and assembling it at an installation site, Which is covered with carbon fiber to improve the durability and light weight of the blades.

Another object of the present invention is to provide a blade for a large axial flow blower which is easy to install since the separately manufactured blades are assembled together by a simple fitting method so that one blade shape is formed when they are assembled together by a pin-fitting method.

To this end, according to the present invention, there is provided a blade for a large axial flow fan having a plurality of blades radially coupled to an outer circumferential surface of a rotor, wherein each of the blades is composed of a first wing member and a second wing member, Wherein the first wing member is formed by bending a first perforated network in the form of a blade and heating and pressing a carbon sheet in multiple layers on a surface thereof, the second wing member bending the second perforated network in the form of a blade, A sheet is heated and pressed; The first wing member is provided with a wing shaft coupled to an outer circumferential surface of the rotor.

According to the present invention, since a large blade of 1000 mm or more is divided into two parts, it is convenient for storage and transportation. In addition, the diced blade is made of a lightweight perforated mesh and bonded to the surface of the sheet with a special adhesive such as a multi-layered epoxy. In addition, since the carbon sheet is adhered and hot-pressed at a high temperature to bond the carbon sheet firmly without being peeled off, the dual-divided blade has light weight and durability.

Particularly, the divided blades are provided with fins and pinholes on the opposing surfaces to be assembled with each other. When the fins are inserted into the pinholes, the divided blades are assembled into one. Since the fins and pinholes constitute a pair of at least two, So that it is not necessary to precisely control the assembly tolerance, so that there is an advantage that the assemblability is improved.

1 is a conceptual diagram of a blower of an embodiment of the present invention;
Fig. 2 is a perspective view of the manufacturing process of the blade of the embodiment of the present invention
3 is an exploded perspective view of the blade of the embodiment of the present invention.
4 is an assembled cross-sectional view of the blade of the embodiment of the present invention
5 is a partially enlarged cross-sectional view of the blade of the embodiment of the present invention
6 is an exploded perspective view of a blade according to another embodiment of the present invention.
7 is a partially enlarged cross-sectional view of the blade of another embodiment of the present invention

1 to 5, the blower of the embodiment of the present invention is provided with a rotor 40 in the center at the center thereof and is coupled to the rotation axis of the motor. And a plurality of blades are radially coupled to the outer periphery of the rotor (40).

The blade of the embodiment of the present invention is divided into a first wing member 10 and a second wing member 20 which are approximately centered. The first wing member 10 is formed by bending a plate-shaped first perforation net 11 in the form of a blade to form a frame, and a plurality of carbon sheets 30 are adhered to the surface thereof with epoxy or the like. Layered carbon sheet 30 is firmly bonded to the surface of the first perforation netting 11 by curing the epoxy by heating and pressing at a high temperature.

The first wing member 10 is provided with a wing shaft 13 which is coupled to the outer circumferential surface of the rotor 40 on one side. The wing shaft 13 is integrally formed with the wing shaft 12. When the first piercing net 11 is bent in the form of a blade, the piercing pin 12 is inserted into the first piercing net 11 and is coupled to the first piercing net 11 by welding or the like. A first connection port 14 is formed on the opposite side of the first wing member 10 so as to be coupled with the second wing member 20. And is coupled to the first perforation network 11 by means of a back welding or the like built in the first perforation network 11.

The second wing member 20 is formed by bending a plate-shaped second perforated network 21 in the form of a blade to form a frame, and a plurality of carbon sheets 30 are adhered to the surface thereof with an epoxy or the like. Layered carbon sheet 30 is firmly bonded to the surface of the second perforated net 21 by hot-pressing at a high temperature to cure the epoxy.

The second wing member 20 is provided with a second connection port 22 coupled to a first connection port 14 formed at an end of the first wing member 10. The second connection hole 22 is formed inside the second connecting hole 22 when the second perforated network 21 is bent in the form of a blade and is coupled to the second perforated network 21 by means of welding or the like. The second connection port 22 is provided with a pair of pins 23 at both sides thereof and the first connection port 14 is provided with a pair of pinholes 15 through which the pin 23 is connected.

A bolt hole 16 is formed in the upper portion of the first connection hole 14 so as to penetrate the pinhole 15 through the carbon sheet 30. The bolt hole 16 is formed in each pin 23, The nut portion 24 is formed. When the bolt hole 16 is inserted into the bolt hole 25 and is fastened to the nut 24, the first wing member 10 and the second wing member 20 are combined into a single blade.

The blade of the embodiment of the present invention thus configured is a large size of 1000 mm or more in length, and the diameter of the rotor 40 is only 700 mm or more. Therefore, when the blades are coupled to both sides of the rotor 40, a large blower having a diameter of 3000 mm or more is obtained. Therefore, when these large blowers are produced in the factory and assembled and then sent to the field, they are bulky and difficult to transport. Therefore, most blades and rotors are separated and assembled in the field.

However, the blades and the rotor 40 need to precisely adjust the angle of the blades in the process of assembling, so that the desired air volume is obtained. The blower installation site is different from the factory where the blades are manufactured and the assembling tolerance It is difficult to assemble it because it is not equipped with various tools.

Since the blade is divided into the two portions of the first wing member 10 and the second wing member 20, even if the first wing member 10 is coupled to the outer peripheral surface of the rotor 40 in the manufacturing factory, Since the two wing members 20 are separated from the first wing member 10, the volume of the blower as a whole is not increased and there is no difficulty in carrying. Therefore, since the assembling angle of the first wing member 10 and the rotor 40 can be precisely adjusted, it is not difficult to install the blower at the blower installation site.

The present invention is also characterized in that the first wing member 10 and the second wing member 20 are composed of a lightweight first perforation network 11 and a second perforation network 21 and a plurality of carbon sheets 30 And is fixed in a state of being heated and pressed to ensure durability and light weight. Therefore, there is an advantage that the load of the motor for rotating the blower is reduced and the fatigue of the operator is reduced when the blower is installed in the field.

The second wing member 20 is brought into contact with the first wing member 10 and the pin 23 is inserted into the pin hole 15 in a state where a plurality of the first wing members 10 are radially coupled to the rotor 40, The first wing member 10 and the second wing member 20 are engaged with each other. At this time, since the pin 23 and the pinhole 15 are separated from each other by a pair, the first wing member 10 and the second wing member 20 are precisely matched with each other, Do not. A nut portion 24 formed in the pin 23 through the bolt portion 25 with a bolt hole 16 formed in the upper portion of the first connector 14 in a state where the pin 23 is coupled to the pin hole 15 , The first wing member 10 and the second wing member 20 are not separated and are completed as one blade.

6 to 7 illustrate another embodiment of the present invention. The first wing member 10 and the second wing member 20 of the embodiment of the present invention are manufactured in the same manner. As a means for fastening these wing members only, a first connection port 14a is provided on one side of the first wing member 10 and is embedded in the first perforation network 11. The first connection port 14a The triangular grooves 14b are horizontally extended continuously and the middle of the triangular grooves 14b is constituted by a cutout portion 14c cut in the longitudinal direction so that the upper and lower ends of the divided triangular grooves 14b are elastically do.

The second wing member 20 is provided with a second connecting hole 22a corresponding to the first connecting hole 14a of the first wing member 10 and the second connecting hole 22a is provided with the triangular groove 14b Is provided with a triangular protrusion 22b which is fitted in the longitudinal direction. A fastening bolt 14d for tightening the niped triangular groove 14b is fastened to the first connecting hole 14a at both sides.

In another embodiment of the present invention constructed as described above, the first wing member 10 and the second wing member 20, which are separated from each other, are joined by the triangular grooves 14b and the triangular projections 22b formed in the longitudinal direction to strengthen the binding force. When the centrifugal force is applied to the second wing member 20, a force to drop from the first wing member 10 is applied. At this time, if the area of the connection portion is small, the second wing member 20 may be broken due to the breakage of the connection portion. In consideration of this, the connecting area of the first wing member 10 and the second wing member 20 is increased by the triangular grooves 14b and the triangular protrusions 22b in the longitudinal direction, so that the centrifugal force holding force is increased. When the fastening bolt 14d is fastened to the first connection port 14a of the first wing member 10, the cutout 14c is tightened and the triangular protrusion 14b strongly restricts the triangular protrusion 22b. The member 10 and the second wing member 20 are coupled to each other in an integrated manner.

10: first wing member 11: first perforated mesh
12: shaft region 13: wing axis
14,14a: first connecting hole 14b: triangular groove
14c: cutout portion 14d: tightening bolt
15: pin hole 16: bolt hole
20: second wing member 21: second perforated mesh
22, 22a: second connection port 22b: triangular projection
23: pin 24: nut part
30: carbon sheet 40: rotor

Claims

1. A blade for a large axial flow fan having a plurality of blades radially joined to an outer circumferential surface of a rotor,
Wherein each of the blades is composed of a first wing member and a second wing member, the center being divided into two;
Wherein the first wing member is formed by bending a first perforated network in the form of a blade and heating and pressing a carbon sheet in multiple layers on a surface thereof, the second wing member bending the second perforated network in the form of a blade, A sheet is heated and pressed; And
Wherein the first wing member is provided with a blade shaft coupled to an outer circumferential surface of the rotor.

The method according to claim 1,
The first wing member is provided with a pivot shaft having a wing shaft formed on one side thereof and a first connector having a pair of pin holes on the opposite side thereof. Lt; / RTI >
Wherein the second wing member is provided with a second connecting hole having a pair of pins fitted to the pin hole and the second connecting hole is embedded in an inner space of the second perforated network bent in a blade shape, blade.

3. The method of claim 2,
A bolt hole penetrating through each of the pin holes through the carbon sheet is formed in an upper portion of the first connector,
Wherein a nut portion corresponding to the bolt hole is formed in each of the pins, and a bolt portion is inserted into the bolt hole and is fastened to the nut portion.

The method according to claim 1,
Wherein the first wing member is provided with a shaft end portion having the wing shaft on one side thereof and a first connecting port formed on the opposite side with a long triangle groove in the rotational direction, Is embedded in the inner space of the first perforation network;
Wherein the second wing member is provided with a second connector having a triangular protrusion inserted in the triangular groove formed in a long direction in the rotating direction and the second connector is housed in an inner space of the second perforated network bent in a blade shape;
And the triangular protrusion is constrained by the fastening bolt formed at the center of the triangular groove to cut the triangular protrusion.