JPS5891395A - Double suction type multi-blade fan - Google Patents

Abstract

PURPOSE:To reduce the number of component parts of a double suction type multi-blade fan, by disposing a partition member in the plane of a center plate of the fan, and making it function like two fans. CONSTITUTION:In a casing B, there is provided a partition member 5 in the plane of a center plate 1, in the manner that independent air passages are formed on both sides of the partition member 5. When the shaft of a motor C is set into rotation, an impeller A is also set into rotation, so that air is drawn from a right and a left suction openings of the casing B, and passing through the impeller A and individual air passages, is discharged to the outside from respective discharge openings of the casing B at different air-flow rates. Thus, since the fan is provided with two independent air passages, it functions like two fans and the number of component parts required for constructing the fan can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to improvements in the left and right impellers and ventilation circuit of a well-known dual-suction type multi-blade blower.

Since the oblique cross-sectional view of a conventional well-known dual-suction type multi-blade blower is shown in FIG. The intake air is mixed and blown out when it goes to the outlet . However, since there are only one ventilation path, if the multi-blade blower is used in a mechanism involved in air blowing that requires two independent ventilation paths, an additional blower is required. As a result, the blower system may become more complex.

Since two blowers are required, the number of man-hours required to manufacture the blower system of the mechanism increases, and the cost of the mechanism increases.

Furthermore, it had various disadvantages in that the mechanism required a dog.

The present invention eliminates the above-mentioned conventional drawbacks.

The purpose is to make the performance of the two ventilation systems different so that they can meet different performance requirements.

In order to achieve this object, the present invention provides a dual-suction type multi-blade blower with a casing partition member that forms independent and sufficiently airtight air passages at the front and rear sides of the core plate. The performance of each impeller differs depending on the left and right impellers.

With this configuration, there are two independent ventilation paths, which serve as two blowers. Therefore,
By using the blower in a mechanism involved in air blowing that requires two independent ventilation paths, the number of parts of the blower can be reduced and the ventilation path can be simplified. Furthermore, the number of man-hours required for manufacturing the ventilation system can be reduced, and the mechanism can be made more compact. moreover,
By differentiating various design values for manufacturing the left and right impellers, it is possible to meet the performance requirements of the blower for two sets of mechanisms.

An embodiment of the present invention will be described below with reference to FIG.

FIG. 1 is a perspective cross-sectional view of a double-suction type multi-blade blower according to the present invention. Between stone plate 1 and side plate 2.

This is a double-suction type multi-blade blower consisting of a vane wheel made of blades 3 arranged in the circumferential direction and a spiral casing B. Among them, 1 part of the stone tablet is the boundary.

Partition 9 whose front and rear form independent ventilation passages
A member 6 is provided within the casing B.

In this case, the shape of the partition member 5 is appropriately configured so that each ventilation passage maintains a sufficient degree of airtightness. As an example of this, the uneven shapes shown in FIG. Also.

The uneven shape of the tip of the partition member 5 may be reversed from the structure shown in FIG. In addition, the number of blades on the left and right sides bordering on the stone plate 1 of one impeller arm and the inner diameter (9 blades) are different (the ratio of the inner and outer diameters is the same). Further, the motor C rotates the impeller.

Next, to explain the operation, when the shaft of motor C rotates, the impeller rotates, and air flows in from the left and right suction ports of casing B, passes through the impeller, and enters casing B through independent ventilation channels. Air is blown out from the air outlet with different performance (static pressure, air volume, efficiency, etc.).

In this way, there are two independent ventilation passages, which serve as two blowers.

Therefore, when the double suction type multi-blade blower of the present invention is used in a mechanism involved in air blowing that requires two independent ventilation passages,
The number of parts of the blower can be reduced and one ventilation circuit can be simplified. Furthermore, the man-hours required for manufacturing the blower system can be reduced. Additionally, the mechanism is more compact and costs are reduced. Furthermore, even if the required performance of the mechanisms for the two sets of air blowing systems is different, the corresponding performance can be achieved.

In order to make the performance of the two sets of blowers different depending on the left and right impellers, as mentioned above, the outer diameter of the impellers must be adjusted.

Not only the number of inner diameter 9 blades differs, but also the inner and outer diameter ratio.

Impeller width, blade shape (blade curve shape, wall thickness).

(shape of both ends of the blade, etc.), chord length of the blade, installation of the blade, various impeller design specifications such as the inlet angle and outlet angle of the square nine blades, the shape of the boss part, etc.
The sizes may be different.

The present invention relates to a single-car suction type multi-blade blower, which is provided with a partition member that forms independent ventilation passages at the front and rear with a stone plate as a boundary, and furthermore, the design specifications of the impellers located on the left and right sides of the partition member. Therefore, when the blower of the present invention is used in a mechanism involved in air blowing that requires two independent ventilation passages, it acts as two blowers with the partition member as a boundary, and the The number of parts is reduced and one ventilation can be easily constructed. Furthermore, the number of man-hours required for manufacturing the blower system is reduced.

The mechanism can be made compact and costs can be reduced.

In addition, even if the required performance of the ventilation system of the mechanism differs between the two sets, it has various effects such as being able to respond to each of them.

[Brief explanation of the drawing]

FIG. 1 is a cross-sectional view of a double-suction type multi-blade blower according to an embodiment of the present invention, and FIG. 2 is a cross-sectional view of a conventional double-suction type multi-blade blower. M... Impeller, B... Casing, 1
...Stone plate, 2...Side board, 3...
・Blade, 6...Partition member.

Claims (1)

[Claims] It is equipped with a left and right impeller consisting of a stone plate, a side plate, and blades arranged in a circumferential direction between the six plates and the side plate, and a spiral casing. A dual-suction type multi-blade blower in which a partition member is provided in the casing to form an independent and sufficiently airtight ventilation passage, and the left and right impellers have different performances.