JPH0740720Y2 - Fan casing for range hood - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of use) The present invention relates to a fan casing for a range hood, and more specifically, the discharge portion of the casing has a quadrangular shape, and a circular duct joint is used for connection to the discharge portion. Regarding improvement of a fan casing.

(Prior Art) Generally, a multi-blade blower (sirocco fan) is used as an exhaust unit installed in a range hood installed above a gas stove and an electric stove in a kitchen. This multi-blade blower has a volute type. It is built into the fan casing.

By the way, in terms of performance and manufacturing, this fan casing has an upper plate and a lower plate punched from a metal flat plate in a predetermined shape, which are opposed to each other with a predetermined gap, and a body plate is placed between the upper plate and the lower plate. Is generally formed by mounting. Therefore, the shape of the discharge portion of the fan casing is substantially square.

On the other hand, in the round duct joint to which the discharge part of the fan casing is joined, a cylindrical part for connecting the circular duct is formed upright from the flat plate part, and the inner diameter of the cylindrical part is the same as that of the discharge part of the fan casing. It is an inscribed circle.
Therefore, the flat part of the round duct joint blocks each corner of the discharge part in a substantially triangular shape, and as a result, the blown air hits the flat part of the round duct joint to cause a collision loss and a collision noise. become. This collision loss leads to a reduction in exhaust performance.

Therefore, in order to reduce the above-mentioned collision loss, there is a conventional one in which the shape of the inlet of the flat plate portion of the round duct joint is made the same shape (quadrangle) as the shape of the discharge portion of the fan casing, and it is narrowed to a cylindrical shape.

(Problems to be Solved by the Invention) In the above-described conventional structure, a substantially square tube is squeezed into a cylindrical shape which is an inscribed circle of the square, and a range hood of this type is attached. The location is near the ceiling, and the gap between the outlet of the fan casing of the range hood and the ceiling or wall is not so wide, and since it is manufactured by drawing, it is necessary to connect the outlet of the fan casing and the duct. The length of the cylinder of a round duct joint is limited. Therefore, even if the diaphragm is changed from a square shape to a circular shape as described above, it is not possible to sufficiently secure the length of the transition portion from the corner formed by the diaphragm to the circular shape, and it is possible to reduce the collision loss. The reality is that you can't expect.

Further, it requires a high-level processing of squeezing from a quadrangle to a circle, which is also a problem in productivity.

The present invention has been made in view of the problems of the above-described conventional technology, and the purpose thereof is to attach a simple component to the discharge portion of the fan casing to form a flat plate portion of the round duct joint. To eliminate the occurrence of collision loss.

(Means for Solving the Problems) In order to achieve the above-mentioned object, a range hood fan casing according to the present invention is provided in at least an outer half portion of an inner surface of a rectangular discharge portion of a casing body in which a fan is incorporated. , An auxiliary member for partitioning a circular shape having substantially the same shape as the circular tubular portion of the round duct joint connected to the discharge portion is attached.

Since the above-mentioned auxiliary member has a circular discharge portion, the member may be one that partitions each corner portion of a square discharge portion into an arc, and each corner portion may be partitioned by an independent member, or The four corners may be separated by one member.

Further, the auxiliary member is to be attached at least at two places, that is, the outer half part from the center of the discharge part.

(Operation) According to the above means, by attaching the auxiliary member, the discharge portion of the fan casing has a semicircular shape at least at the outer side and conforms to the cylindrical shape of the round duct joint. The occurrence of collision loss at is eliminated.

(Effects of the Invention) Since the fan casing for the range hood of the present invention is configured as described above in detail, the outer flow in the casing having a high flow velocity due to the centrifugal force is rounded at least in the outer portion in the discharge part. Since it has a circular shape that substantially coincides with the cylindrical inner surface of the shaped duct joint, it is possible to eliminate the occurrence of collision loss. Since the flow inside the casing is slower than the outside, even if a collision of wind speed occurs without attaching an auxiliary member to the inside, the exhaust performance will not be affected much, so that even outside only The effect is sufficiently obtained.

Further, since the structure can be achieved only by fixing the auxiliary member to the inner surface of the discharge portion of the casing main body, it is easy to manufacture and can be easily implemented.

(Embodiment) An embodiment of the present invention will be described below with reference to the drawings. In the drawing, reference numeral 1 denotes a casing body, which is molded in a well-known volute shape, and a fan 8 is mounted on an upper plate 1a constituting the casing body 1. The opening 7 for attachment is opened, and the upper plate 1a
The discharge portion 2 defined by the lower plate 1b and the body plate 1c has a substantially square shape in a plane. A bell mouth is attached to the opening 7 to form a suction port.

A flange portion 3 horizontally protruding outward is formed on the discharge portion 2 of the casing body 1, and the flange portion 3
Is joined to the top plate 4 of the range hood body, and a round duct joint 5 is concentrically joined and fixed to the upper surface of the top plate 4.

An auxiliary member 6 made of a metal plate cut into a substantially triangular shape is provided at two outer corner portions on the inner surface of the discharge portion 2 of the casing body 1 from the ridge line a of the corner portion toward the opening end b of the discharge portion 2. Curved in an arc shape and the side edges are welded and fixed by spot welding or the like.

That is, by attaching the auxiliary members 6 to the two outer half portions of the discharge portion 2, the outlet shape of the outer half portion of the discharge portion 2 has a semicircular shape as shown in FIG. 2, and the semicircular shape is round. It will substantially coincide with the inner surface of the cylindrical portion 5a of the duct joint 5.

In the figure, 8 is a fan (multiblade fan) mounted in the casing body 1, 9 is a duct, and 10 is a tongue.

With the above configuration, the auxiliary member 6 is provided in the outer half portion of the discharge portion 2, so that the blown air collision is eliminated at the two outer diagonal portions c of the flat plate portion 5b of the round duct joint 5. .

Although the above embodiment is an example in which the auxiliary member is attached only to the outer portion of the discharge portion, it is of course possible to attach the auxiliary member to the two corner portions inside the discharge portion.

However, in that case, since the shape of the auxiliary member has the tongue portion 10, it is needless to say that the shape is different from that shown in the drawing.

[Brief description of drawings]

The drawings show an embodiment of the present invention. Fig. 1 is a partially cutaway front view, Fig. 2 is a plan view of a fan casing, Fig. 3 is a plan view of a round duct joint, and Fig. 4 is a partially cutaway view. FIG. In the figure, 1: Casing body, 2: Discharge part 5: Round duct joint, 6: Auxiliary member

Claims (1)

[Scope of utility model registration request] Claim: What is claimed is: 1. At least an outer half portion of an inner side surface of a rectangular discharge portion of a casing main body in which a fan is incorporated has a circular shape substantially the same as a circular tubular portion of a round duct joint connected to the discharge portion. Fan casing for a range hood with an auxiliary member attached.