JPH11325794A - Fan stack for axial flow fan - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a fan stack for an axial flow fan of a low cost with a high roundness, a light weight, easy handleability, and a high strength by molding the stack in a cylindrical state with a fiber-reinforced resin, and embedding the members in a suitable number of stages. SOLUTION: In the case of manufacturing the fan stuck, reinforcing members made of an angle steel or the like obtained by sandwiching a glass fiber between upper and lower surfaces are arranged, for example, in three stages at a suitable angle in a predetermined shape mold. Then, after a thermoplastic resin or the like is cast in the mold, a molded fan stack piece is removed from the mold when a predetermined time is elapsed. Then, the stack 12 in which three reinforcing members 13a to 13c made of a fiber-reinforced resin (FRP) by coupling six fan stack pieces are, for example, embedded in an overall length in a circumferential direction is manufactured. Thus, a product having a light weight, easy handleability, a high roundness and strength can be manufactured at a low cost.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a fan stack for an axial fan, and more particularly to a fan stack suitable for an axial fan of a cooling tower.

[0002]

2. Description of the Related Art Axial fans are used in various fields for cooling, blowing or ventilating various facilities. For example, an axial fan is used in a cooling tower used to cool and circulate hot water discharged from an air conditioner of a factory facility or a building. Therefore, a cooling tower will be described for understanding the present invention. This cooling tower has a so-called "cross-flow method" in which hot water and cooling air flow intersect at right angles in terms of the cooling method of hot water, and a so-called "counter flow method" in which hot water and cooling air flow face each other. The present invention is applicable to any cooling system. Therefore, as an example, FIG. 1 shows a schematic configuration of a cross-flow cooling tower.

In FIG. 1, filler blocks 2 are provided on both sides of a ventilation space 1, an axial fan 3 is mounted above the ventilation space 1, and a hot water distribution tank is provided above each of the filler blocks 2. 4 is provided, and the hot water distribution tank 4 is supplied with hot water from a hot water supply pipe 5 via a water spray box 6. A number of nozzles 7 are provided on the bottom surface of each hot water distribution tank 4, and hot water is supplied to the filler block 2 via the nozzles 7, and the supplied hot water flows down in the filler block 2. On the other hand, the axial fan 3 generates a flow F of air from the louver 8 on the side of the filler block 2 to the ventilation space 1 via the filler block 2, and the airflow F cools hot water flowing down in the filler block 2. Is done. Then, the air after the heat exchange with the hot water is released to the outside after water droplets are separated by the eliminator 9. Thus, in the cross-flow type cooling tower, the hot water flowing down is cooled by the airflow supplied from the lateral direction. Thus, the hot water that has passed through the filler block 2 becomes cold water and is stored in the cold water tank 10 as a water receiving mechanism.

By the way, a fan stack installed outside the cooling fan is surrounded by a fiber reinforced resin (FR).
When manufacturing in P), in order to secure the strength,
As shown in (1), it is general to apply an uneven pattern to the surface of the fan stack 11. The actual method of manufacturing a fan stack having this uneven pattern is to form a predetermined uneven pattern on a mold such as a mold or a resin mold corresponding to a size obtained by dividing a cylindrical fan stack into several pieces in the vertical direction. Applying the net-shaped glass fiber to this mold, pouring the resin from above, moistening it, and laying the net-shaped glass fiber on the resin and pouring the resin from above ensure the strength This is a method in which the operation is repeated several times to complete the operation when a predetermined thickness is reached, and one fan stack piece is obtained. By joining several pieces of the fan stack thus manufactured, a fan stack as shown in FIG. 2 can be obtained (hereinafter, referred to as an FRP fan stack).

A steel fan stack for an axial fan is also provided. In the case of this steel fan stack, there is no uneven pattern as shown in FIG.
A so-called bell-mouth type shape with an expanded skirt portion or a shape in which a cylinder is placed on a truncated cone is often used (hereinafter referred to as a steel fan stack). In the case of this steel fan stack, a fan stack having a predetermined size is manufactured by joining several fan stack pieces manufactured by a can-making operation or forging.

As described above, one fan stack is manufactured by combining several fan stack pieces.
In the case of an FRP fan stack obtained by joining several fan stack pieces having a concavo-convex pattern on the surface, the roundness of a completed fan stack is often low. If the roundness is low, the axial fan may come into contact with the fan stack.There is a margin between the axial fan and the fan stack to prevent such contact trouble. The fan stack has been manufactured such that a certain gap or more exists. As a result, the gap between the axial fan and the fan stack becomes unnecessarily large, and the performance of the axial fan cannot be maximized.

Further, as described above, each fan stack piece made of FRP is produced by repeating the work of laying glass fiber and pouring resin several times, so that the thickness becomes thick, and each fan stack piece becomes thicker. In many cases, portions having different thicknesses often occur. Therefore, the fan stack may vibrate during operation.

On the other hand, the steel fan stack has a larger overall weight than that made of FRP, and is inconvenient to handle. Further, the steel fan stack has a disadvantage that the manufacturing cost is higher than that of the FRP fan stack. When a steel fan stack is used for the cooling tower, especially in the case of a large cooling tower, a large steel fan stack must be provided at the top of the cooling tower, so that the cooling can withstand the weight of the steel fan stack. There is a drawback that the tower body needs to be strong and the manufacturing cost of the cooling tower body is also high. In addition, large cooling towers are often installed outdoors,
Steel fan stacks need to increase corrosion resistance.

The present invention has been made in view of the above-mentioned problems of the prior art, and has as its object the purpose of having high roundness, light weight, easy handling, high strength and low cost. An object of the present invention is to provide a fan stack for an axial fan which is less likely to cause trouble.

[0010]

SUMMARY OF THE INVENTION In order to achieve the above object, the gist of the present invention is to form a fan stack into a cylindrical shape made of FRP and to attach a reinforcing member along the circumferential direction of the cylindrical fan stack. It is characterized by being buried in multiple steps or multiple steps. As described above, since the fan stack of the present invention is made of FRP, it is lightweight and easy to handle, and it is possible to secure a predetermined strength by embedding the necessary number of reinforcing members in the circumferential direction. Since there is no such uneven pattern, it is possible to manufacture a product with high roundness.

[0011]

The gist of the present invention is to provide a fan stack for an axial fan, wherein the fan stack is formed in a cylindrical shape made of a fiber-reinforced resin, and is formed in a circumferential direction of the cylindrical fan stack. A first invention is a fan stack for an axial fan, in which a reinforcing member is buried in one or more stages along the same, comprising a hot water distribution device for supplying hot water above the filler block, and an axial fan. An axial fan fan stack of a cooling tower having a water receiving mechanism below the block and cooling the hot water flowing down in the filler block by the airflow sucked by the axial fan and flowing into the filler block. The fan stack is formed in a cylindrical shape made of fiber reinforced resin, and reinforcing members are embedded in one or more stages along the circumferential direction of the cylindrical fan stack. The axial fan fan stack characterized by comprising a second invention.

The fan stack for an axial fan according to the present invention comprises:
Since it is made of FRP, the overall weight is light and easy to handle.
Also, since the strength is given by embedding the reinforcing member without forming an uneven pattern over the entire fan stack, the predetermined strength is provided by adjusting the number of reinforcing members while providing high roundness. It can be easily secured. Because of the high roundness, the gap between the axial fan and the fan stack can be minimized, and the performance of the axial fan can be maximized. Also,
Since the required number of reinforcing members can be manufactured simply by laying them in a manufacturing device (eg, a mold) and pouring the resin therein, the manufacturing cost is low, and the thickness of the fan stack is thinner (lighter) than that of the conventional uneven pattern. 2) It can be made uniform, and operation troubles such as vibration hardly occur.

This fan stack can be used as a fan stack for an axial fan of various facilities.
When used as a fan stack for an axial fan of a cooling tower in which a large-diameter axial fan having a diameter of 2 to 10 m is often used, the above advantages can be more reliably enjoyed.

[0014]

Embodiments of the present invention will be described below. FIG.
FIG. 4 is a plan view of a fan stack for an axial fan according to the present invention, and FIG. 4 is a side view thereof. Next, a method of manufacturing the fan stack will be described. First, a glass fiber is laid in a mold having a predetermined shape, and a reinforcing member made of angle iron having an angled cross section is placed thereon (reference numeral 13 in FIG. 5). Were arranged in three steps at appropriate intervals, and glass fiber was further spread on the top. Then, a thermoplastic resin was injected into the mold, and the fan stack piece was taken out of the mold after a certain period of time. According to the above-described manufacturing method, six fan stack pieces having the same shape are manufactured, and these six fan stack pieces are connected to form an FRP fan stack 12 for an axial flow fan having a shape as shown in FIGS. I got FIG. 5 (a)
FIG. 4 is a sectional view taken along the line AA in FIG. 3. In the fan stack shown in FIG. 4, a reinforcing member 13 having a shape as shown in FIG. 5B is embedded over the entire length in the circumferential direction of portions 13a, 13b, and 13c. It can be adjusted as needed.

As the reinforcing member embedded in the resin, the angle iron is used in the above embodiment, but the present invention is not limited to this, and other members may be used.

In this embodiment, the diameter of the fan stack on the air intake side (the lower side in FIG. 4) is increased.
The shape is not limited to this, and may have the same diameter as a whole, or may have a larger diameter on the air discharge side (upper side in FIG. 4).

[0017]

Since the present invention is configured as described above, the following effects can be obtained. Since it is made of FRP, in addition to being lightweight and easy to handle, unlike a conventional FRP fan stack, a predetermined strength can be imparted without forming an uneven pattern, so that a fan stack having high roundness Can be manufactured. Due to the high roundness, the gap between the axial fan and the fan stack can be made constant and as narrow as possible. As a result, it is possible to maximize the performance of the axial fan.

Since the resin can be manufactured only by pouring the resin into the manufacturing apparatus (die) once, the manufacturing cost is low, the thickness of the fan stack can be made thin (light weight) and uniform, and there is no possibility of vibration during operation.

In order to impart a predetermined strength to the fan stack, it can be easily performed only by increasing or decreasing the number of reinforcing members.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a cross-flow type cooling tower.

FIG. 2 is a perspective view of a conventional cooling tower in which a part of a fan stack for an axial fan is cut away.

FIG. 3 is a plan view of a fan stack for an axial fan according to the present invention.

FIG. 4 is a side view of the fan stack for an axial fan of FIG. 3;

5A is a sectional view taken along the line AA in FIG. 3, FIG.
(B) is a perspective view of a reinforcing member.

[Explanation of symbols]

 2 Filler block 3 Axial fan 4 Hot water distribution tank 10 Cold water tank 11 and 12 Fan stack 13 Reinforcing member

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Takeo Kimura 3-1-8-701 Naka, Koyocho, Higashinada-ku, Kobe City, Hyogo Prefecture

Claims (2)

[Claims] 1. A fan stack for an axial fan, comprising:
An axial fan fan stack in which the fan stack is formed in a cylindrical shape made of fiber reinforced resin, and reinforcing members are embedded in one or more stages along the circumferential direction of the cylindrical fan stack. 2. A hot water distribution device for supplying hot water above the filler block and an axial fan, a water receiving mechanism below the filler block, and hot water flowing down the filler block is supplied to the axial fan. It is a fan stack for an axial fan of a cooling tower of a type that is cooled by an airflow that is sucked in and flows into a filler block, wherein the fan stack is formed into a cylindrical shape made of fiber-reinforced resin, and the cylindrical fan stack is formed. A fan stack for an axial fan, wherein a reinforcing member is embedded in one or more stages along a circumferential direction.