JP4512343B2 - Multi-wing fan - Google Patents

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), 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 formed by crimping and fixing 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 multi-blade fan for caulking fixed, pre SL each vane arrangement plate, upper and lower ends startup plate portion arranged in the blade spanwise from the blade Tsubasahaba direction middle portion of the plate portion and the insertion engaging piece and each standing 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 startup plate portion in the insertion locking pieces bayonet locking and locked and fixed to form a start-up end of the connecting portion also serves, rising of the connecting combined To form a biting portion by said top and bottom plate ends to caulking fixed (claim 1).

According to the above means, the upper plate, a lower plate caulking fixed involving the commissioning ends the rising plate section formed by engaging fixed in the insertion locking pieces for insertion locking the difference Komiana To increase the connection strength between the blade component plates, and when they are clamped and fixed, they bite into the step structure formed by the rising end composed of the insertion locking piece and the rising plate portion located behind it. The recessed portion is formed on the upper plate and the lower plate.

Since the present invention is configured as described above, it has the following advantages.
Since the connecting parts of the blade constituent plates are provided at the rising ends and the rising ends are crimped and fixed to the upper and lower plates, the connecting strength of the connecting parts is doubled and stable between the blade constituent plates. Demonstrating the connection strength, the connection does not loosen and the angle of the blade component plate does not change, and the predetermined blowing performance can be maintained permanently. 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. More specifically, 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 during caulking and fixing. The upper and lower plates have a biting part that prevents relative displacement, and there is no risk of the upper plate shifting from the cylindrical body to the lower body (power transmission plate) and the cylindrical body after long-term use. 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. The relative displacement of the plate 3 and the lower plate 4 is prevented, and the deterioration of durability in the long-term use of the upper plate 3 and the lower plate 4 is prevented.

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 (1)

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 has the rising plate portion on the insertion locking piece that is inserted and locked into the insertion hole between adjacent blade constituent plates. and locked and fixed to form a start-up end of the connecting portion also serves, 喰込by the fact that the upper and lower plates to caulking fixed to startup edge of the connecting portion also serves Multiblade fan, characterized in that part was formed.

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