JP2005133570A - Multiblade fan - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a multiblade fan manufactured by manufacturing blades one by one and fixing them to upper and lower plates (power transmission plates) and capable of connecting blades firmly and mutually by utilizing bonding strength of the upper plate and the lower plate for a cylindrical body effectively. <P>SOLUTION: A connection part 61a for bringing upper and lower end plate parts 21, 21, 21, 21 of adjacent blade constituent plates 1 close to a required interval and connecting them mutually rises to form a rising end 61, and the upper plate 3 and the lower plate are tightened and fixed to the rising end 61 to double connection strength of the connection part 61a. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a multi-blade fan, and more particularly to a multi-blade fan manufactured by manufacturing blades one by one and fixing them to an upper plate and a lower plate.

Conventionally, as a fan used for a blower or the like, a multi-blade fan is frequently used in order to obtain a small size, a high pressure, and a large air volume.
A multiblade fan is made by winding a substrate with a necessary number of blades cut and raised from a single plate in a ring shape, caulking and fixing the upper plate and lower plate, or by narrowing the flat plate into a cylindrical shape, In addition to the type in which the blades are cut out (hereinafter referred to as the former), the fan blades are manufactured one by one, and both ends of the blades are connected to each other to form a cylindrical body. There is a type (hereinafter referred to as the latter) that is fixed by crimping to an upper plate or a disk-like lower plate (power transmission plate) (for example, Patent Document 1).

Since the number of blades and the length of the patent document (the latter) 1 can be designed freely, the performance is improved as compared with the former in which the length of the substrate is naturally determined from the outer diameter of the fan and the number of blades is limited. It is possible to make a fan to do.
Then, between the adjacent blades, a latching portion (latching protrusion) provided on one of the upper and lower end plate portions is hooked on a latching portion (holding groove) provided on the other to form a cylindrical body After that, the rising plate portion raised from the end portions of the upper and lower end plate portions is crimped and fixed to the upper and lower plates.
The caulking and fixing is performed by using a conventionally known caulking machine called a double seamer. However, there is a case where the joining strength due to caulking may vary over the entire circumference, and the lower plate (power) The cylinder is displaced from the transmission plate) and the upper plate is displaced from the cylinder, or the idler cannot rotate to maintain the specified air blowing performance. Is a factor that reduces durability.
Further, strength is required for the connection between the blades, and in the case of mere latching between the latching portion (latching projection) and the latched portion (latching groove), it takes a long time. In addition, there is a possibility that stable connection strength cannot be maintained. In addition, there is a problem in that the engaging portion between the latching portion (the latching projection) and the latched portion (the latching groove) is exposed and gets injured during cleaning.
JP-A-8-28494

The present invention has been made in view of the above-described conventional circumstances, and a technical problem thereof is that in a multiblade fan in which blades are manufactured one by one and fixed to upper and lower plates, the upper plate and lower plate of a cylindrical body are manufactured. The blade is firmly connected to each other by effectively utilizing the bonding strength with the plate (power transmission plate).
Still another technical problem is to increase the bonding strength to the upper plate and lower plate (power transmission plate) of the cylindrical body by effectively using the connecting portion between the blades.

The technical means taken to solve the above-mentioned problem is that the upper and lower end plate portions of a desired length are provided at both ends in the blade blade width direction curved to a predetermined curvature to form a necessary number of blade constituent plates. The upper and lower end plate portions of the blade constituting plate to be connected are brought close to each other at a required distance to form a cylindrical body, and the rising ends formed upright at the end portions of the upper and lower end plate portions of the cylindrical body are used as upper and lower plates. In the multiblade fan for caulking and fixing, the connecting portion is provided at the rising end, and upper and lower plates are caulked and fixed to the rising end (claim 1).
As an example of the specific example, each of the blade constituent plates is provided with an upright plate portion and an insertion locking piece arranged in a row from the middle portion of the blade width direction of the upper and lower end plate portions to the blade blade length direction. The insertion hole is formed in the rising boundary part of the rising plate part or in the vicinity of the boundary part, and the cylindrical body is formed into an insertion hole between adjacent blade constituent plates. The rising plate portion is locked and fixed to an insertion locking piece to be inserted and locked to form a rising end also serving as a connecting portion, and the upper and lower plates are crimped and fixed to the rising end of the cylindrical body. A configuration can be given (claim 2).

According to the above-described means, the upper and lower end plate portions of the adjacent blade constituent plates are connected to each other while being brought close to the required distance, and the connection strength between the blade constituent plates is enhanced by the caulking fixing force of the upper and lower plates. ).
In the second aspect, the upper plate and the lower plate are inserted by winding the rising end formed by locking and fixing the rising plate portion to the insertion locking piece inserted and locked in the insertion hole. A step structure formed by a rising end composed of an insertion locking piece and a rising plate portion located behind the insertion locking piece when the caulking is fixed to enhance the connection strength between the blade constituent plates. The biting part that bites into the upper plate and the lower plate is formed.

Since the present invention is configured as described above, it has the following advantages.
(Claim 1) Since the connecting portion between the blade constituent plates is provided at the rising end and the rising end is crimped and fixed to the upper and lower plates, the connecting strength of the connecting portion is doubled and stable for a long time. The connection strength between the blade component plates can be exhibited, and the predetermined blower performance can be maintained permanently without loosening the connection and changing the angle of the blade component plates.
In addition, since the connecting portion is not exposed, there is no fear that the connecting portion may interfere with cleaning or be injured as a protrusion.
(Claim 2) In addition, the step structure of the connecting portion (the step structure composed of the insertion locking piece and the rising plate portion locked and fixed to the insertion locking piece) is fixed to the cylindrical body when fixed by caulking. The upper plate and lower plate are formed with biting parts that prevent relative displacement of the cylinder, and there is no risk that the upper plate will shift with respect to the lower plate (power transmission plate) with respect to the lower plate (power transmission plate). , Durability and reliability can be improved.
In addition, since the biting portion has a rib function, there is no fear that the upper plate and the lower plate are distorted by long-term use.

  Embodiments of the multiblade fan of the present invention are shown in FIGS.

  1 to 9, a multiblade fan A includes a necessary blade component plate 1 having blades 11, a cylindrical member 2 formed by connecting adjacent blade component plates 1, and the cylindrical member 2. Are provided with an upper plate 3 and a lower plate 4 that are fixed by crimping.

  As shown in FIG. 2 and the like, the blade component plate 1 has a desired length dimension that faces the blade length L direction of the blade 11 via the narrow portion 71 at the upper and lower ends of the blade width W direction of the blade 11 that curves to a predetermined curvature. The upper and lower end plate portions 21 and 21 are continuously provided, and the rising plate portion 31 and the insertion locking piece 41 can be raised from the middle of the upper and lower end plate portions 21 and 21 in the blade length L direction. The necessary pieces are prepared by forming.

  As shown in FIG. 2 or the like, an insertion hole 51 is opened in the rising boundary portion of the rising plate portion 31 or in the vicinity of the boundary portion.

  The insertion hole 51 is formed in a long hole shape so that the adjacent insertion locking piece 41 can be inserted and locked between the adjacent blade constituent plates 1.

  As shown in FIG. 3, the cylindrical body 2 is an insertion lock formed by raising the adjacent blade constituent plates 1... Close to the required interval and standing up at the upper end plate portions 21, 21 and between the lower end plate portions 21, 21. The piece 41 is inserted and locked in the insertion hole 51, and the rising plate portion 31 is formed upright so as to be locked and fixed to the insertion locking piece 41 from the outside as shown in FIGS. Thus, the rising end 61 also serving as the connecting portion 61a is formed and connected in a rectangular shape, and then wound in a circular shape.

  As shown in FIGS. 6 and 7, the cylindrical body 2 includes the upper rising end 61... Group and the ring-shaped upper plate 3, and the lower rising end 61. The multi-blade fan A is assembled and formed by caulking and fixing the lower plate 4 provided with a boss portion in order to attach the rotating shaft of the motor.

As shown in FIG. 9, the assembled multi-blade fan A has a rising end composed of a blade component plate 1... And a connecting portion 61 a including an insertion locking piece 41 and a rising plate portion 31 positioned behind it. The step structure 5 formed by 61 is formed, and the upper plate 3 and the lower plate 4 are crimped and fixed as shown in FIG. In a state where the plate 4 is covered without being exposed, the connection strength is doubled by caulking and fixing.
Further, the upper plate 3 and the lower plate 4 at the time of caulking and fixing bite into the undulations of the step structure 5 so as to form a biting portion 6 having a rib-like function as shown in FIG. While preventing the relative displacement of the plate 3 and the lower plate 4, it is possible to prevent deterioration of the durability of the upper plate 3 and the lower plate 4 during long-term use.

The disassembled perspective view of the multiblade fan of this Embodiment. The top view of a blade | wing component board. The perspective view which shows the state before connecting blade | wing component plates. The perspective view which shows the connection state of blade | wing component plates. The partial expanded sectional view of FIG. The fragmentary sectional view which shows the state before the caulking fixation which set the upper board to the cylindrical body. The fragmentary sectional view which shows the state which crimped and fixed the upper board to the cylindrical body. 7 is partially cut away in the plan view of FIG. 7 is partially cut away in the side view of FIG.

Explanation of symbols

A: Multi-blade fan 11: Blade 1: Blade component plate 21: Upper and lower end plate portion 31: Rising plate portion 41: Insertion locking piece 51: Insertion hole 61: Rising end 61a: Connecting portion 3: Upper plate 4: Lower plate 2: Cylindrical body

Claims (2)

  The upper and lower end plate portions of a desired length are provided at both ends in the blade blade width direction curved to a predetermined curvature to form a necessary number of blade constituent plates, and the upper and lower end plate portions of the adjacent blade constituent plates are arranged at a required interval. In a multiblade fan in which a cylindrical body is formed by connecting them close to each other, and a rising end formed upright at the end of the upper and lower end plate portion of the cylindrical body is fixed to the upper and lower plates by crimping, A multiblade fan characterized in that the connecting portion is provided, and upper and lower plates are crimped and fixed to the rising end.   The upper and lower end plate portions of a desired length are provided at both ends in the blade blade width direction curved to a predetermined curvature to form a necessary number of blade constituent plates, and the upper and lower end plate portions of the adjacent blade constituent plates are arranged at a required interval. In the multi-blade fan in which a cylindrical body is configured by being brought close to each other, and a rising end formed upright at the end of the upper and lower end plate portion of the cylindrical body is fixed by crimping to the upper and lower plates, each blade component plate Is capable of rising up the rising plate portion and the insertion locking piece from the middle of the blade blade width direction of the upper and lower end plate portions in the blade blade length direction, and the rising boundary portion of the rising plate portion Alternatively, an insertion hole is opened in the vicinity of the boundary, and the cylindrical body engages the rising plate portion with an insertion locking piece that is inserted and locked into the insertion hole between adjacent blade constituent plates. A multiblade fan characterized in that it is fixed to form a rising end that also serves as a connecting portion, and the upper and lower plates are crimped and fixed to the rising end.

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