JPH0596490U - Centrifugal blower - Google Patents

Abstract

(57) [Summary] [Structure] A centrifugal blower (so-called double suction centrifugal blower) in which air intakes 3A, 3B are formed on both sides of the casing P in the axial direction of the shaft O. A centrifugal blower in which an impeller F is configured by attaching a plurality of impeller members 2 to each of two impeller main plates 1A and 1B arranged adjacent to each other in the axial direction of the axis O. [Effect] Since the part related to one impeller main plate can be used also as the impeller of the single-suction centrifugal fan,
A common impeller can be used for both the suction type centrifugal blower and the single suction type centrifugal blower, so that it is possible to provide a centrifugal blower that rationalizes production equipment and reduces production costs. it can.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a centrifugal blower in which an impeller is supported inside a casing by a shaft, and air inlets are formed on both sides of the casing in the axial direction of the shaft. (Hereinafter, a centrifugal blower having air inlets formed on both sides of the casing in the axial direction of the shaft is referred to as a "double suction centrifugal blower".)

[0002]

[Prior Art]

 Conventionally, in this type of double-suction type centrifugal blower, an impeller has a structure in which a plurality of impeller members 17 are provided on both plate surfaces of one impeller main plate 16 as shown in FIG. It had been.

[0003]

[Problems to be solved by the device]

 However, in the centrifugal type blower, a centrifugal type blower in which the air intake 3 is formed only on one side of the casing P as shown in FIG. 6 (hereinafter referred to as “single suction type centrifugal blower”) is also generally used. It is often used, and in order to rationalize production equipment and reduce production costs, it is possible to use a common impeller for both suction type centrifugal blowers and single suction type centrifugal blowers. However, according to the above-mentioned conventional technique, the impeller is configured such that the plurality of impeller members 17 are attached to both sides of one impeller main plate 16 on the plate surface, so that one-side suction When used in a fan-type eccentric fan, a plurality of impellers 17 attached to the half of the impeller, that is, the plate surface of the impeller main plate 16 opposite to the air intake port 3 is used as an impeller. Will not work, so Roots vehicles, can not be combined on one suction type centrifugal blower. The present invention is to eliminate the above-mentioned conventional drawbacks.

[0004]

A centrifugal blower according to the present invention is characterized in that an impeller has a plurality of blade members for each of two impeller main plates arranged adjacent to each other in the axial direction of the shaft. The point is that it is attached.

[0005]

[Action]

 According to a characteristic configuration of the present invention, the impeller is constituted by two impeller main plates that are arranged adjacent to each other in the axial direction of the shaft, and therefore, the plurality of impeller members are the main impeller of each impeller main plate. Since it is attached to the plate surface on one side, the part related to one impeller main plate can also be used as the impeller of a single-suction centrifugal fan.

[0006]

[Effect of the device]

 According to the characteristic configuration of the present invention, since the part related to one impeller main plate can be used as the impeller of the single-suction centrifugal fan, the double-suction centrifugal fan and the single-suction centrifugal fan can be used. It is possible to use a common impeller with the type blower, and thus it is possible to provide a centrifugal blower that rationalizes production equipment and reduces production costs.

[0007]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 and FIG. 2 show a double suction type centrifugal blower. The centrifugal blower is composed of a snail type casing P and an impeller F supported by a shaft O inside the casing P. The impeller F is a so-called multi-blade impeller composed of an impeller main plate 1 fixed to an axis O and a plurality of impeller members 2 attached on the plate surface of the impeller main plate 1. is there. Air inlets 3A and 3B are formed on both sides of the casing P in the axial center direction of the shaft O. An air outlet 4 is formed on the upper surface of the casing P.

Therefore, the air in the casing P is rotated in the casing P with the rotation of the impeller F, and flows out toward the centrifugal direction of the impeller F due to the centrifugal force of the impeller F. The air is blown in the rotating direction of the impeller F along the inner surface side of the portion of the wheel F located in the centrifugal direction, and is guided to the air outlet 4 and discharged. Then, along with this, air is taken into the casing P from the air intake ports 3A and 3B, so that air is blown.

The air inlets 3A and 3B are formed as circular openings on both sides of the casing P in the axial direction of the shaft O, and their diameters are the same as those of the impeller F 1 as a multi-blade impeller. It is wider than the diameter of the impeller. Further, each of the air intake ports 3A and 3B is provided with a suction cone 5 that guides the taken-in air inward of the impeller F. The suction cone 5 is detachably attached to the casing P by fastening the edge portion 5a to the casing P with a mounting screw 6. Further, the cone portion 5b is formed in a cylindrical shape which is tapered toward the inner side of the casing P, so that the air taken in from the air intake port 3A or 3B is directed toward the axis O side of the plurality of blade members 2. It is configured to lead to the internal space of the impeller F located.

Both ends of the shaft O are supported by bearings 7. The bearing 7 is fixed to a bearing support frame 8 in which a flat frame is assembled in a T shape. The bearing support frame 8 is fixed to a fixed frame 9 as a member attached to the casing P. The fixed frame 9 is located outside the air intake 3A or 3B (including the edge of the opening on the casing P side where the edge 5a of the suction cone 5 is fastened and fixed) in the casing P, and It is composed of an L-shaped steel 9a fixed vertically to the left and right positions of the opening, and an L-shaped steel 9b fixed laterally to the position below the opening. Therefore, the bearing support frame 8 is fixed to the fixed frame 9 by fixing the attachment portions 8a formed at the left and right ends and the lower end of the T-shaped frame to the fixed frame 9 with the attachment screws 10. It is provided to be removable.

Now, the impeller F will be described in detail. The impeller F is provided with two impeller main plates 1A and 1B arranged adjacent to each other in the axial direction of the axis O. The impeller main plate 1A is provided with a plurality of blade members 2 on its peripheral edge only on the plate surface facing the air intake 3A side. The impeller main plate 1B is provided with a plurality of blade members 2 on its peripheral edge only on the plate surface facing the air intake 3B side. That is, the portion of the impeller F related to the impeller main plate 1A is composed of the same components as the impeller F'of the single-suction centrifugal fan shown in FIG. The portion related to the impeller main plate 1B is configured by attaching the same constituent parts as the portion related to the impeller main plate 1A of the impeller F with the left and right sides reversed.

Both the impeller main plate 1A and the impeller main plate 1B are fixed to the flange portion 11a of the hub 11 provided on the shaft O by mounting screws 12 at four positions around the shaft O. .. A spacer 13 is interposed between the impeller main plate 1A and the impeller main plate 1B of the mounting screw 12, and the impeller main plate 1A and the impeller main plate 1B are fastened together by a mounting screw 12. The hub 11 is provided so as to be stopped around the axis O by the key 14.

[Other Embodiment] In the above-described embodiment, the impeller main plate 1A and the impeller main plate 1B are fixed to the common hub 11 through the spacer 13 by co-fastening, but shown in FIG. As described above, the hubs 15A and 15B may be attached to the hubs 15A and 15B, respectively.

Further, in the case of the above configuration, the shaft O and the impeller F may be supported by one bearing portion 7, as shown in FIG.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the configurations of the accompanying drawings by the entry.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the overall configuration of a double-suction centrifugal fan.

FIG. 2 is a front view showing the overall configuration of a double-suction centrifugal fan.

FIG. 3 is a vertical sectional view showing an impeller of another embodiment.

FIG. 4 is a vertical sectional view showing an impeller of another embodiment.

FIG. 5 is a vertical sectional view showing a conventional impeller.

FIG. 6 is a vertical cross-sectional view showing the overall configuration of a single-suction centrifugal fan.

[Explanation of symbols]

 F Impeller O Shaft P Casing 1A Impeller main plate 1B Impeller main plate 2 Impeller member 3A Air intake port 3B Air intake port

Claims (1)

[Scope of utility model registration request] 1. An impeller (F) is supported inside a casing (P) by a shaft (O), and the casing (P) is provided.
Is a centrifugal blower in which air intakes (3A), (3B) are formed on both sides of the shaft (O) in the axial center direction, and the impeller (F) is a shaft of the shaft (O). A centrifugal blower configured such that a plurality of blade members (2) are attached to each of two impeller main plates (1A) and (1B) arranged adjacent to each other in the axial direction.