JPS60145492A - Structure of centrifugal blower - Google Patents

Abstract

PURPOSE:To secure the balance of pressure by varying each dimension from the edge surface in the center to the both suction ports when the interval between the edge surface of a motor and the edge surface of the side plate of a casing on the opposite side to the motor is less than the diameter of a vane wheel, in a centrifugal blower for the both multiblade vane wheels for suction. CONSTITUTION:When the min. interval L between the side-plate edge surface 3 of a casing 1 covering the both multiblade vane wheels 6a and 6b for suction and the edge surface of a motor 8 is less than the outside diameter of the vane wheel, each dimension l1, l2 from the intermediate partitioning plates 10 of the both vane wheels 6a and 6b to the respective suction ports is varied and set to obtain the relation l1>l2. Therefore, the imbalance of the pressure inside the vane wheel is eliminated, and the stable flow is maintained, and the vibration of the vane wheel itself which is generated by the imbalance of the pressure and the noise generated by the above-described vibration can be suppressed, and the stable performance can be secured.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to improving the blowing performance of a double-suction type centrifugal blower used in air conditioners and the like and reducing vibration noise during operation.

Conventional structure and its problems Traditionally, a dual-suction type centrifugal blower has a dual-suction type centrifugal blower in which a motor for driving a double-suction multi-blade impeller (hereinafter simply referred to as an impeller) is installed near the cooshing of the double-suction type centrifugal blower. However, in order to simplify the structure of the double-suction type centrifugal blower, the impeller is fixed directly to the motor shaft.

However, when the impeller is directly fixed to the motor shaft in this way, the weight of the impeller needs to be cantilevered only by the motor shaft, which reduces the strength of the shaft.

From a cost standpoint, the shaft length must be designed to be as short as possible. As a result, the mounting position of the motor is
Because it is close to the suction port on one side of the impeller, it causes an imbalance in the resistance when drawing air into the impeller.
They had problems such as unstable air blowing performance and generation or increase of vibration and noise.

OBJECTS OF THE INVENTION The present invention solves these problems, and is aimed at solving problems such as when a motor for driving an impeller is installed very close to the suction port of the impeller, or when a part of the motor is installed close to the impeller's suction port. Even if it gets inside, stable air blowing performance is ensured, and vibration and noise are not generated during operation.

The purpose is to prevent this from increasing.

Structure of the Invention In order to achieve this object, the present invention has different dimensions from the end plate provided perpendicularly to the axial direction near the center of the impeller to the two suction ports.

With this configuration, when a double-suction type centrifugal blower is operated, the air sucked into the impeller through the nozzles provided on both sides of the casing is measured from the end plate of the impeller on the side where the motor is attached to the suction port By setting the dimension shorter than the other dimension, it eliminates the pressure imbalance inside the impeller, ensures a stable flow, and reduces the vibration of the impeller itself caused by the pressure imbalance inside the impeller. Noise caused by vibration can also be suppressed.

DESCRIPTION OF EMBODIMENTS The present invention will be described below with reference to FIGS. 1 to 4 showing one embodiment thereof.

In FIG. 1, 1 is a casing of a double suction type centrifugal blower, and 2 is a side plate A of the casing 1 of the double suction type centrifugal blower.
3 is the side plate B of the casing 1 of the double suction type centrifugal blower opposite to the side on which the motor is attached; 4 is the nozzle portion provided on the side plate 2; a nozzle portion B provided on the side plate B3;
6 is a multi-blade impeller for both suctions, 6a is one impeller of the multi-blade impeller 6 for both suctions, which is on the side of the side plate A2, and 6b is the other impeller of the multi-blade impeller 6 for both suctions. In the car, on the side of the side plate B3, 7 is the discharge port, and 8 is the multi-blade impeller 6 for both suctions.
A motor 9 for driving the motor 8 is a shaft of the motor 8 to which the impeller 6 is fixed. Also, Figure 2 shows Figure 1 from A-A.
Figure 3 shows a cross-sectional view along the line. FIG. 3 shows an enlarged view of the impeller 6, and in the figure, 1o is a partition plate for dividing the impeller 6 into two suction parts. FIG. 4 shows the impeller 6
In the figure, 11 is a suction port A112 provided on one side of the impeller 6a of the impeller 6, and the other 6 is a suction port A112.

The suction port B provided in the impeller 6b of the vehicle is shown.

1 to 4, L is the minimum distance between the side plate 3 and the end face of the motor 8, D is the outer diameter of the impeller, 1. is the length of one impeller 6a portion of the impeller 6, and 4□ is the length of the other impeller 6 of the impeller 6.
It shows the length of part b.

Air flow will be explained using FIGS. 1 to 4.

When the impeller 6 is rotated by the drive of the motor 8, air flows through the side plate 2 of the casing 1. Nozzle A4 installed on B3
, B5 to the suction rom 11. of the impeller 6. It is sucked into B12, given energy in impeller 6, and sent out through the discharge lower. In this case, if the distance between the side plate B3 and the motor 8 is narrow, or if the motor 8 is partially inside the impeller 6, the flow of air will be obstructed by the motor 8, so that the nozzle A4. The amount of air sucked into the suction port of the impeller 6 through B5 is larger from one impeller 6a portion of the impeller 6 than from the other impeller 6b portion, and this flowing air amount The difference between impeller 6
In the case of LD, the length in the axial direction of the impeller 6 is set as β1>7!2, and each blade part The speed of the air flowing through the impeller 6 is made the same, and the rotation of the impeller 6 is stabilized.

Effects of the Invention As is clear from the above embodiments, the lengths of the blades of the double-suction multi-blade impeller are made to vary depending on the resistance on the two air suction sides of the double-suction centrifugal blower according to the present invention. , it is possible to ensure a double-suction type centrifugal blower with stable performance.

[Brief explanation of the drawing]

Fig. 1 is a front view of a double-suction type centrifugal blower which is an embodiment of the present invention, Fig. 2 is a sectional view taken along the line A-A in Fig. 1, Fig. 3 is an enlarged sectional view of the same essential parts, and Fig. 4 Figure (a) is a side sectional view of the same impeller, and Figure 4 (b) is a front view of the same impeller. 1... Casing, 6... Multi-blade impeller for both suctions, ea, eb... Impeller, 8... Motor, 11. 12... Suction port, 11, 62... Axial length of impeller 6. Name of agent: Patent attorney Toshio Nakao and 1 other person
1 Figure Figure 2 Procedural amendment (method) April 20, 1980 l Indication of the case 1982 Patent Application No. 251258 2 Name of the invention Structure of centrifugal blower 3 Relationship with the person making the amendment Patent Issue Colonel Wan Address 1006 Kadoma, Kadoma City, Osaka Prefecture Name (
582) Matsushita Electric Industrial Co., Ltd. Representative Toshihiko Yamashita 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. 5 Date of the amendment order 7 Name of the invention in the statement of contents of the amendment Correct "Centrifugal blower" to "Centrifugal blower structure". Procedural amendment April 20, 1980 1. Indication of case 1988 Patent application No. 251258 2. Name of invention Centrifugal blower structure 3. Person making the amendment Relationship with the case Patent application Person in charge Location Kadoma, Osaka Prefecture City bold Kadoma 1006 name (
582) Matsushita Electric Industrial Co., Ltd. Representative Toshihiko Yamashita 4 Agent 571 Address 1006 Oaza Kadoma, Kadoma City, Osaka Prefecture Matsushita Electric Industrial Co., Ltd. Claims column 6 amendment of the specification subject to the 5 amendment We will make corrections as per the attached sheet. 2. Scope of Claims The minimum gap between the end face of the motor for driving the multi-blade impeller for both suctions and the end face of the side plate of the casing on the side facing the motor is such that the minimum gap between the end face of the motor for driving the multi-blade impeller for both suctions is If it is smaller than the external dimension, the dimension from the end plate provided perpendicularly to the axial direction of the multi-blade impeller for both suctions to the suction port of the multi-blade impeller for both suctions on the side facing the motor, The structure of a centrifugal blower is set smaller than the dimension between the suction port on the side facing the motor and the suction port on the opposite side.

Claims (1)

[Claims] When the minimum distance between the end face of the motor that drives both suction multiblade impellers and the end face of the side plate of the casing on the side facing the motor is smaller than the external dimensions of the both suction multiblade impellers, The dimension from the end plate provided perpendicularly to the axial direction of the dual suction multiblade impeller to the suction port of the dual suction multiblade impeller on the side opposite to the motor, A centrifugal blower that is set smaller than the distance between the suction port and the opposite suction port.