JPS63309796A - Exhaust gas recirculating blower - Google Patents

Abstract

PURPOSE:To cool a motor by means of air by providing an introduction port, which is exclusively used for exhaust, in addition to an air introduction port to a revolving blade part, and providing an air introduction port to a motor room, and further providing an air hole to the middle part of a partition wall. CONSTITUTION:An air introduction port 21 is provided to an end of a motor casing 9 on its motor room 14 side, while an air hole 26, which makes the air from the air introduction port 21 pass into a revolving blade part 1, is provided at the middle part of a partition wall 15. An exhaust introduction port 18 is formed at the middle part of a side-and-end part of a revolving blade chamber 10, while an air outlet 27 is formed at the outer circumferential part of the chamber 10. The air is introduced from the air introduction port 21 into the motor room 14 and is sucked from an introduction port 22 via the air hole 26 into the revolving blade part 1. The exhaust gas is mixed with the air, which is sucked from a revolving-blade-air-introduction-port 12 via both introduction ports 18 and 19, and is discharged from outlets 13 and 27. As a result, the motor can be cooled only by air, thereby prolonging the life of the motor.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] This invention relates to a blower for recirculating exhaust gas.

[Conventional technology]

Generally, a blower rotates rotary blades using a motor etc.
This allows air to be introduced from the outside and supplied to a desired device, and is used, for example, to supply combustion air for an external combustion engine.

As a conventional device of this type, there is a device as shown in FIG. The device shown in FIG. 2 is a blower exclusively for air as shown in the Mechanical Engineering Handbook (B5. Fluid Machinery, Journal of the Japan Society of Mechanical Engineers). In this blower, reference numeral 9 denotes a case for storing a motor and the like, which is divided into a rotating blade chamber 10 and a motor chamber 14 by a partition I5. In the center of this case, a shaft 2 is supported by a bearing 8, and a rotating blade 1 is fixed to the tip of the shaft 2, and a commutator motor 3 is fixed to the center of the shaft 2. 1!1 is housed in a rotating blade chamber 10 of the case 9, and the commutator motor 3 is housed in a motor chamber 14. The commutator motor 3 is
Rotor electromagnet attached to shaft 2 4. A stator electromagnet 5 provided around this rotor electromagnet 4. It is comprised of a brush 6 and electrodes 7 that supply electricity to the rotor electromagnet 4.

Further, an air inlet 11 is formed in the rotary blade chamber 10 on the central axis of the shaft 2, a rotary blade air inlet 12 is formed on the central axis of the shaft 2 of the rotary blade 1, and a rotary blade air inlet 12 is formed on the central axis of the shaft 2 of the rotary blade 1. A rotary vane air outlet 13 which serves as an air outlet is formed in the rotary vane air outlet 13 . A ventilation hole 16 is formed in the partition wall 15 so that air can flow between the rotary blade chamber 10 and the motor chamber 14, and an air outlet 17 is also formed in the motor case 9.

Next, the operation will be explained.

When a voltage is applied to the brush 6, the commutator motor 3 rotates, and the shaft 2 and rotating blade 1 rotate.

As a result, air passes through the air inlet 11 of the rotary blade chamber 10 and the air inlet 12 of the rotary blade 1, and is discharged from the rotary blade air outlet 13 due to centrifugal force. This air outlet 1
3 is introduced into the commutator motor chamber 14 through a ventilation hole 16 formed in the partition wall 15 of the case 9 and cools the commutator motor 3. The air is discharged from the air outlet 17, passes through a pipe (not shown), and is used as combustion air or the like.

[Problem that the invention seeks to solve]

By the way, in a combustion engine, NO in the exhaust gas
As a countermeasure against x, an exhaust gas recirculation method is adopted in which the exhaust gas is circulated back into the intake system. When using the above-mentioned blower in such a system, exhaust gas is introduced into the blower together with air from the air inlet 11, but when the exhaust gas is recirculated in this way, water vapor components in the exhaust gas, etc. There was a problem in that the commutator motor 3, especially the brushes 6 and electrodes 7, were corroded.

This invention was made in order to eliminate the above-mentioned drawbacks of the conventional exhaust gas, and even if exhaust gas is recirculated, the commutator motor can be cooled only with air, and the life of the motor can be extended. The purpose is to obtain a blower for recirculation.

[Means for solving problems]

In the exhaust gas recirculation blower according to the present invention, in addition to the air inlet, the rotary blade has an inlet exclusively for exhaust air, and furthermore, an air inlet is provided in the motor chamber so as to change the flow in the commutator motor chamber. A ventilation hole is provided in the center of the partition wall.

[Effect]

In this invention, the blower separately introduces air and exhaust gas into the rotating blades from two gas inlet ports in the center of the rotating blades, and only air flows into the motor to cool the motor. .

〔Example〕

Hereinafter, embodiments of the present invention will be described with reference to the drawings.

FIG. 1 is a sectional view of an exhaust gas recirculation blower according to an embodiment of the present invention, and in the figure, the same reference numerals as in FIG. 2 indicate the same or corresponding parts. In this embodiment, rotating blades 1. Although the arrangement of the components such as the commutator motor 3 and the structure of the commutator motor 3 are the same as in the conventional example, the gas flow path is significantly different.

That is, the motor case 9 has an air inlet 21 at its end on the motor chamber 14 side, and a vent hole 26 in the center of the partition wall 15 that allows air from the air inlet 21 to pass through to the rotating blades.
A rotating blade chamber exhaust inlet 18 is formed at the center of the end on the side of the rotating blade chamber 10, and an air outlet 27 (air blowing port) is formed at the outer periphery of the rotating blade chamber 10. The rotary vane 1 also has a rotary vane exhaust inlet 19 in its center.
and a rotating blade air inlet 22 are formed separately, and an air and exhaust outlet 13 is formed on the outer periphery of the rotating blade 1.
is formed.

Note that a description of the manifold piping system downstream of the air outlet 27 will be omitted.

Next, the effects will be explained.

The rotation of the commutator motor 3 causes the shaft 2 and the rotary blade 1 to rotate. As a result, air is supplied to the commutator motor chamber 1 from the air inlet 21 provided in the commutator motor case 9.
4 to cool the commutator motor 3. After cooling the commutator motor 3, the air passes through the ventilation hole 26 and is sucked into a portion of the rotating blade 1 through the rotating blade air inlet 22.

On the other hand, the exhaust gas passes through the rotary vane chamber exhaust inlet 18 and the rotary vane exhaust inlet 19, and then passes through the rotary vane air inlet 19.
The air passes through the rotating blade 1 part while being mixed with the air sucked in from the rotating blade air outlet 13 and the air outlet 27.

As described above, in this embodiment, the exhaust and air introduction paths are separate, and the only gas flowing through the commutator motor 3 is air, so that the brushes of the motor 3 are not corroded by the water vapor components of the exhaust gas. There is no problem, and the life of the motor can be extended.

Although not shown, an air throttle is provided at the air inlet 21 and an exhaust throttle is provided at the rotary blade chamber exhaust inlet 18, so even if the motor rotation speed changes, the air is The exhaust/air ratio of the mixed gas of air and exhaust gas sent out from the outlet 27 is kept constant, and the ratio can be easily changed by replacing the throttle.

〔Effect of the invention〕

As described above, according to the present invention, the air inlet and the exhaust inlet are separately provided in the rotary blade portion of the blower, and the motor portion of the blower is cooled only with air instead of a mixed gas of exhaust gas and air. Therefore, corrosion of the commutator motor can be prevented and the life of the motor can be extended.

Also, since the air inlet and exhaust inlet are provided separately,
A restriction for flow rate adjustment can be provided at each of these inlets, etc., which allows the ratio of exhaust/air to be kept constant even if the fan speed changes, and the ratio can be easily adjusted as necessary. There are effects that can be changed.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional side view showing an exhaust gas recirculation blower according to an embodiment of the present invention, and FIG. 2 is a cross-sectional side view showing a conventional blower. DESCRIPTION OF SYMBOLS 1... Rotating vane, 2... Shaft, 3... Commutator motor, 9... Commutator motor case, 10... Rotating vane chamber, 13... Rotating vane air outlet, 14... - Commutator motor chamber, 15... Partition wall, 18... Rotating vane chamber exhaust inlet, 19... Rotating vane exhaust inlet, 21...
Air inlet, 22... Rotating vane air inlet, 26...
・Vent hole, 27...Air outlet. Note that the same reference numerals in the figures indicate the same or equivalent parts.

Claims (2)

[Claims] (1) A drive motor, a rotary vane that rotates together with the rotation shaft of the drive motor, and which circulates gas from the center to the outer circumference by the rotation, a rotary vane chamber that accommodates the rotary vane, and a partition wall that rotates the rotary vane. In a centrifugal blower comprising a blade chamber and a case having a separated motor chamber for accommodating the drive motor, an air inlet for introducing air from the outside into the motor chamber of the case is provided, and an air inlet is provided at the center of the partition wall. A ventilation hole for introducing air from the air inlet into the rotary vane is provided in the rotary vane, an exhaust inlet for introducing exhaust gas for recirculation is provided in the center of the rotary vane, and the rotary vane A blower for recirculating exhaust gas, characterized in that an air outlet for discharging the air and exhaust gas is provided on the outer periphery of the room. (2) The exhaust gas recirculation blower according to claim 1, characterized in that a flow rate regulating throttle valve is provided in either the exhaust gas inlet or the air inlet, or a flow path leading thereto.