JPS586080B2 - Blower - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention provides a blower that sucks a high-temperature gas.
The purpose is to prevent a temperature rise in the bearing and winding of the motor of a blower in which the impeller and the shaft of the motor are directly connected, and to eliminate leakage of gas from the shaft penetrating portion of the blower casing.

Conventionally, in a blower in which an impeller of this type is directly connected to the shaft of an electric motor, as shown in FIG. 2 is fixed with a bolt or the like, and the impeller 5 is fixed to the shaft 17 of the electric motor with a set screw or the like.

FIG. 2 shows a conventional example of a forced intake/exhaust type combustion apparatus that uses such a blower to draw in a high-temperature gas.

In FIG. 2, reference numeral 1 designates the blower described in FIG. 15
It mixes with the gas sucked in and reaches the burner 11, where it is combusted.Then, the combustion gas passes from the heat exchanger 9 through the exhaust chamber 7, is discharged by the impeller 5 through the exhaust passage 8, and is discharged from the shaft. It leaks to the outside from the through hole 18.

Note that 10 is a pilot burner.

In such a conventional device, the temperature of the combustion gas 19 in the exhaust chamber 7 reaches approximately 200°C, so the shaft through-hole 1
The temperature of the bearing 3 and winding 12 of the electric motor reaches 100° C. or more due to combustion gas leaking from the motor 8 and heat transfer from the shaft.

Furthermore, the combustion gas leaking from the shaft through hole 18 has the disadvantage of contaminating the indoor air.

Due to these drawbacks, it has been difficult to realize a forced intake/exhaust combustion device that creates a negative pressure in the combustion chamber.

The present invention improves upon such conventional blowers.

As a configuration for that purpose, the present invention provides a rotating heat dissipation plate between the impeller in the blower casing and the blower casing, and between the blower casing and the electric motor, so as to dissipate the rotational heat between the blower casing and the impeller. A protrusion is provided on the blower casing to face the outer periphery of the plate, and the outer diameter of the rotary heat sink is made larger than the outer diameter of the motor bearing.

Hereinafter, the present invention will be explained with reference to FIGS. 3 and 4 showing one embodiment thereof.

What is shown in FIGS. 3 and 4 is an embodiment in which rotating heat sinks are provided between the bearing and the casing and between the bearing and the impeller and applied to a forced intake/exhaust type combustion device.

In Figures 3 and 4, 20' is the blower casing 4.
This rotary heat sink 20' is located between the rotary heat sink 20' and the impeller 5 and is fixed to the shaft, and maintains the airtightness of the shaft through hole 18 by rotating this rotary heat sink 20'.

20 is located between the blower casing 4 and the bearing 3,
This is a rotating heat sink provided to dissipate the radiant heat of the blower casing 4 and the heat of the shaft 17, and is larger than the outer diameter of the bearing 3.

21 is a protrusion provided on the blower casing 4 to reduce the gap between the rotary heat sink 20 and the blower casing 4 and increase fluid friction in the gap; 22 is a protrusion for fixing the electric motor 2; The intake case forms a ventilation passage and forms part of the air passage 16.

23 fixes the impeller 5 and transfers heat to the shaft 17 and
7 is a protective cover for preventing corrosion caused by combustion gas, and 24 is a heat insulating plate made of asbestos material or the like for preventing radiant heat from the blower casing 4.

The blower of the present invention configured in this way has a rotary heat sink 20.
, 20', the leakage of high temperature gas from the shaft through hole 18 is eliminated and the temperature rise of the bearing 3 is eliminated.

That is, when the rotary heat sinks 20 and 20' rotate, the gas between the rotary heat sinks 20 and the blower casing 4 moves around the rotary heat sinks 20 and 20 at about half the speed of the rotary heat sinks 20 and 20' due to disk friction. It rotates together with .20'.

Therefore, the high temperature combustion gas 1 sucked from the exhaust chamber 7
9 is prevented from leaking into the shaft through hole 18 and is discharged from the exhaust path 8.

Therefore, a decrease in the flow rate due to leakage of the gas body and heating of the bearing 3 due to the leaked gas body are prevented.

As a result, when using a conventional blower, the bearing temperature was 100°C or higher, but with the blower of the present invention,
The temperature decreased to below 50°C, achieving a temperature reduction of 50°C.

(However, this is when the temperature of the combustion gas is approximately 220°C.

) However, when the outer diameter of the rotary heat sink 20 is smaller than the outer diameter of the bearing 3, the effect is reduced by about 20%.

Furthermore, if the gap between the rotating heat sink 20, 20' and the blower casing 4 becomes too large, the rotation of the gas body in the gap will cause the rotating heat sink 20. 20', and its effect is halved.

The optimal value for this gap varies depending on the rotation speed, but is approximately 1.5
mm, and can be applied to gaps up to 3 mm.

As is clear from the above embodiments, the blower of the present invention prevents leakage from the shaft through hole of the blower casing by providing a rotating heat sink between the impeller and the bearing of the electric motor, thereby preventing high temperatures. The temperature of the bearing can be prevented from rising when the gas of The exhaust chamber 7 is closed by a wall 4' having
Intake case 2 in which electric motor 2 is located in a part of air passage 16
By providing the combustion chamber 2, it is possible to create a completely sealed forced intake/exhaust combustion device with a negative pressure in the combustion chamber, and it is possible to realize a safe combustion device without gas leakage or leakage of combustion gas.

According to the present invention, it is possible to prevent leakage from the shaft through-hole of the blower casing and prevent the temperature rise of the bearing when a high-temperature gas is sucked with a simple configuration. A fully enclosed forced intake/exhaust combustion device that prevents combustion gas from leaking into the room can be realized.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a conventional blower, and Fig. 2 is a partially cutaway sectional view of a forced intake/exhaust combustion device using a conventional blower.
FIG. 3 is a sectional view of a blower showing one embodiment of the present invention;
The figure is an enlarged sectional view of the main parts of the blower. 1... Blower, 2... Electric motor, 3... Bearing, 4... Blower casing, 5... Impeller, 18... Shaft through hole, 20
．． 20'...Rotating heat sink.

Claims (1)

[Scope of Claims] 1. A rotary heat sink is provided between the blade storage in the blower casing and the blower casing, and between the blower casing and the electric motor, and the rotary heat sink between the blower casing and the impeller is A blower in which a protrusion is provided on the blower casing facing the outer periphery, and the outer diameter of the rotating heat sink is larger than the outer diameter of the motor bearing. 2 The gap between the rotating heat sink and the blower casing is 3 mm.
An air blower according to claim 1 having the following configuration.