JPS62142899A - Fan for combustion - Google Patents

Abstract

PURPOSE:To lower the temperature of a bearing part by providing a heat insulating board on the casing side of a cooling vane, while providing a cooling duct having an opening on the cooling vane side and an inlet part on the opposite side to said cooling vane. CONSTITUTION:A cooling vane 12 is fixed to a motor shaft 4 positioned in between a casing 14 and a motor 18, and a heat insulating board 13 is provided on the casing side of the cooling vane 12. A cooling duct 7 has an opening part 9 on the casing 14 side while having an inlet part 10 on the motor 18 side. And, radiant heat to the motor 18 is shut off by the heat insulating board 13, while air is sucked in from the inlet part 10 to the opening part 9 to cool the motor 18, and discharged out of the opening part 9. Thereby, the temperature at the bearing part can be greatly lowered.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to the prevention of overheating of a combustion fan motor bearing of a water heater or the like.

BACKGROUND OF THE INVENTION Conventionally, the bearing of a combustion fan is held by guides 26 fixed to both ends of a case 21 of a motor 33, as shown in FIG. Inside the bearing 25, there is a blade 3 at one end.
21, and the motor shaft 2 fixed to the rotor 23 at the end of the pond.
4 is rotatably held. During operation, the combustion fan sucks the combustion exhaust gas from the water heater through the suction port 30, and the air outlet 31, the shing 29, and the blades 32 are also heated, so a cooling blade 28 is provided in the middle of the motor shaft 24. It is being However, since there is a gap in the circumferential direction of the cooling vanes 28, the radiation heat from the casing 29 cannot be sufficiently blocked, so that the bearing 25 becomes hot. Furthermore, if the ambient temperature around the motor 33 is too high, even if the motor 33 is cooled by the cooling blades 28, the morph Tamano cooling effect will not be sufficient and the bearing 25 will become hot.

Problems to be Solved by the Invention However, in the above configuration, the bearing 25 of the motor 33 becomes stagnate, so that the lubricant such as oil or grease inside the bearing 25 hardens at high temperatures of about 90° C. or higher. This caused serious problems such as the deterioration of the bearings progressing to granulation, the lubricating effect of the bearings became insufficient, abnormal noises were generated, and eventually the bearings seize up and stop rotating.

In view of the above-mentioned problems, the present invention provides a combustion fan whose rotational life is significantly extended by lowering the bearing temperature of the combustion fan.

Means for Solving the Problems In order to solve the above problems, the combustion fan of the present invention includes a motor shaft having blades fixed to one end thereof, a casing that rotatably accommodates the blades, and the motor shaft. a stay that fixes the motor and the casing; a cooling blade that is fixed to the motor shaft between the casing and the motor and holds a heat shield on the casing side; and a stay that includes the motor and holds the cooling blade side. A cooling duct is provided with an opening in the cooling duct and an inlet on the opposite side of the cooling vane.

Function The wood-fired F3A has the above-mentioned configuration, and the heat insulating plate of the cooling vane prevents abrasive heat from being transferred from the casing to the motor, and the cooling duct sucks in low-temperature air, which cools the internal motor. bearing temperature decreases.

EXAMPLE Hereinafter, a combustion fan according to an example of the present invention will be described with reference to the drawings.

FIG. 1 shows a sectional view of a combustion fan in an embodiment of the present invention. In FIG. 1, the bearing 5 is held by guides 6 fixed to both sides of the case 1 of the motor 18, and the stake 2 is held inside the case 1. Inside the stator 2, a rotor 3 fixed to a motor shaft 4 is rotatably held by the bearing 5. A blade 17 fixed to a motor shaft 4 is rotatably housed inside a casing 14 held by a stay 11 fixed to a side surface of the case 1. A suction port 15 is provided at the center portion of the casing 14, and an outlet port 16 is provided at the outer peripheral portion. Casing 14 and motor 18
A cooling blade 12 is fixed to the motor shaft 4 located between the
A heat shield plate 13 is located on the casing side of the cooling vane 12 and is provided on the motor shaft 4 .

The motor 18 is enclosed in the casing 1 via the spacer ya.
It has an opening 9 on the 4 side, and the inlet gIK10 is connected to the motor 18 (
A cooling duct 7 included in IIJ is provided.

The aj operation of the combustion fan configured as described above will be explained below with reference to FIG.

When the motor 18 rotates, the blades 17 rotate within the casing 14, sucking in the exhaust gas of about 250° C. from the water heater through the suction port 15 of the casing 14, and exhausting it into the atmosphere through the outlet 16. At this time, the connection from the casing 14 to the motor 18
Is radiation heat directed to heat shield plate 13? This reduces the temperature rise on the side of the motor. Also, the cooling vanes 12 fixed to the motor shaft 4 rotate together with the heat shield plate 13 (!), sucking air through the opening 9 and discharging it toward the outer circumference of the cooling vane 12.

Therefore, the air in the opening 9 is transferred to the inlet 10 of the cooling duct 7.
The motor 17 is cooled and then taken out from the opening 9. The inlet section 10 is provided in a low temperature section of the water heater to enhance the cooling effect of the motor 17. Therefore, motor 1
8 decreases, and the temperature of the bearing 5 decreases to 1 large.

Effects of the Invention As described above, the present invention provides a heat shield on the casing side of the cooling vane to prevent heat from being radiated to the casing, and also sucks low temperature air through the cooling vane and the cooling duct. In order to cool the motor contained in the bearing, the temperature of the bearing part drops significantly. Therefore, the life of iM sliders such as bearing oil and grease is greatly extended, and the reliability of the combustion fan is significantly improved.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a combustion fan according to an embodiment of the present invention, and FIG. 2 is a sectional view of a conventional combustion fan. 1... Case, 4... Motor shaft, 5...
...Bearing, 7...Cooling duct, 9...
...Opening, 10...Entrance, 12...
...Cooling vane, 13... Heat shield, 18...
··motor.

Claims (1)

[Claims] A motor shaft with a blade fixed to one end, a casing rotatably housing the blade, a motor driving the motor shaft, a stay fixing the motor and the casing, and a motor shaft between the casing and the motor. A cooling fan which is fixed and holds a heat shield plate on the casing side, and further includes a cooling duct that encloses the motor, has an opening on the cooling blade side, and has an inlet on the opposite side of the cooling blade. fan.