JPH05336706A - Ventilating filter for rotary electric machine - Google Patents

Abstract

PURPOSE:To reduce the frequency of overhaul and cleaning work of a rotary electric machine by making easier the removal of dust stuck to an air filter attached to a ventilating filter. CONSTITUTION:A nozzle 7 discharging compressed air is installed inside a ventilating filter 5 attached to a suction port 1a of a stator frame 1 of the rotary electric machine. An air pressure rubber hose 12 is connected to a connecting pipe 7a of this nozzle 7, and this air pressure rubber hose 12 is connected to an exhaust outlet of an air pressure cylinder for brake of a motor vehicle as a compressed air source.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ventilation filter for a rotary electric machine mounted on, for example, a main motor of a vehicle.

[0002]

2. Description of the Related Art An example of an induction motor used as a conventional main motor for railway vehicles is shown in a vertical sectional view of FIG. Figure 3
, An annular stator core 13 made of a laminated iron core is inserted and attached from the left side to the inner periphery of the stator frame 1 having a U-shaped cross section, and is formed in the inner periphery of the stator core 13 in the axial direction. The stator coil 13b is inserted in each of the formed grooves 13a. Iron core retainers 13c are inserted on both sides of the stator core 13, and a fitting portion formed on the right side of the outer periphery of the annular bearing frame 3A is inserted at the left end of the stator frame 1, and the stator frame is fixed by bolts 3a. It is fixed at 1.

A roller bearing 14A is inserted into the inner periphery of the bearing frame 3A from the left side, and the left side surface of the outer ring of the roller bearing 14A is
Bearing retainer 16 whose inner outer periphery is inserted into the inner periphery of the bearing frame 3A
The right side of A is pressed. The fitting portion formed on the right outer circumference of the bearing frame 17 is inserted from the inside into the inner circumference of the right side plate 3B of the stator frame 1, and the ball bearing 14B is inserted into the inner circumference of the bearing frame 17. The outer ring of this ball bearing 14B has a bearing frame 17
It is pressed by the left side surface of the bearing retainer 16B in which the fitting portion of the left outer periphery is inserted into the inner periphery of.

Between the inner circumference of the roller bearing 14A and the ball bearing 14B,
The shaft 6 is pre-pressed. An annular rotor core 2 made of a laminated core is press-fitted in advance in an intermediate portion of the shaft 6, and iron core retainers 2a are pre-press-fitted in both sides of the rotor core 2. In these rotor cores 2, a plurality of ventilation holes 18 are formed at equal intervals in the axial direction near the inner circumference. The fin 4 is press-fitted on the left side of the left iron core retainer.

An intake port 1a with a flange is formed on the upper right end of the outer periphery of the stator frame 1, and a flange portion at the lower end of the draft filter 15 shown in the perspective view of FIG. 4 is formed on the upper part of the intake port 1a. 15a is placed and fixed with bolts 15b. An air filter 19 is attached to the side surface of the ventilation filter 15. A plurality of exhaust ports 1b are provided at the left end of the outer periphery of the stator frame 1.
Are provided at equal intervals. At the left end of the shaft 6, a joint 8 omitted in detail is inserted.

In the induction motor for a railway vehicle constructed as described above, the external cooling air is circulated by the fan 4 rotating with the rotor core 2 on the side surface of the draft filter 15 as shown by the arrow F1. The dust is removed through the filter 19 and flows into the inside of the stator frame 1 from the intake port 1a as shown by an arrow F2. Then, part of this cooling air
As shown by the arrow F3, pass through each ventilation hole 18 to the left, and click the arrow F4
It is sucked by the fan 4 as shown by and is discharged to the outside from the exhaust port 1b as shown by arrow F7. Also, the intake port 1a
A part of the cooling air flowing in from the inside passes through the narrow gap formed between the stator core 13 and the rotor core 2 to the left as shown by the arrow F5, and is blown by the fan 4 as shown by the arrow F6. It is sucked and similarly discharged to the outside.

[0007]

However, in the induction motor configured as described above, when the vehicle is suspended by a vehicle on a dusty line, such as a subway train, dust attached to the air filter 19 causes In addition, the pressure loss of the sucked cooling air due to the air filter 19 may increase, the air volume of the cooling air may decrease, and the coils of the rotor and the stator may be overheated. For this reason, the air filter 19 must be frequently cleaned to remove the attached dust.

Further, during running for a long time, dust adhering to the inside of the ventilation hole 18 accumulates, and the volume of the cooling air decreases due to the reduction of the cross section of the ventilation hole 18. Therefore, the induction motor is removed from the vehicle, It must be disassembled to remove dust adhering to the inside.

Therefore, a method of increasing the density of the fibers of the filter medium used in the air filter 19 to increase the dust collection efficiency can be considered, but then the pressure loss due to the dust adhering to the air filter 19 is added, There is also a drawback that the frequency of cleaning the air filter 19 must be increased because the air volume of the cooling air rapidly decreases. A method of removing the ventilation filter 15 and replacing it with a spare one is also conceivable. However, since this induction motor is installed in a narrow space inside the trolley, it is difficult to carry out the work and rather takes time.

Therefore, in recent vehicles, a traction motor equipped with a centrifugal separation or gravity type ventilation filter is also used. Centrifugal separation or gravity ventilation provided in such a narrow space is also used. The filter cannot be expected to have sufficient dust separation performance. Currently, even the highest-performance draft filters have a maximum collection efficiency of about 80%, and the remaining 20% of dust remains inside the rotating electric machine. Adhere and deposit. Therefore, periodical cleaning by disassembling the rotating electric machine cannot be omitted. Then, the objective of this invention is to obtain the ventilation filter of the rotary electric machine which can remove easily the dust adhering to an air filter.

[0011]

According to a first aspect of the present invention, there is provided a ventilation filter for a rotating electric machine, which is provided at a cooling air suction port of the rotating electric machine and has an air filter attached to an outer periphery thereof. It is characterized in that a nozzle for discharging the compressed air to the inner surface of the air filter is provided inside.

[0012] According to a second aspect of the present invention, there is provided a ventilation filter for a rotary electric machine, which is provided at a cooling air suction port of the rotary electric machine and has an air filter attached to an outer periphery thereof. A ventilation filter for a rotary electric machine, characterized in that a nozzle for discharging the compressed air discharged when the vehicle is stopped is provided on the inner surface of the air filter.

Further, the invention according to claim 3 is a ventilation filter for a rotary electric machine, which is provided at a cooling air suction port of a rotary electric machine and has an air filter attached to the outer periphery thereof. Nozzle connected to the air pressure source connection portion provided on the side surface of the air filter for discharging the compressed air to the inner side surface of the air filter.

[0014]

According to the first aspect of the present invention, the dust collected by the air filter is blown outward by the compressed air discharged from the nozzle, and the initial amount of the cooling air for the rotary electric machine is secured. It

In the invention described in claim 2,
The dust collected in the air filter is blown outside by the compressed air discharged from the nozzle that is supplied from the surplus air pressure source discharged from the stopped vehicle, and the cooling air volume of the rotating electric machine is set to the initial value. Secured.

Further, in the invention as set forth in claim 3, the dust collected in the air filter is supplied all at once from the air pressure source connected to the air pressure source connecting portion, and outside by the compressed air discharged from the nozzle. The air flow rate of the cooling air for the rotating electric machine is maintained at the initial value.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a ventilation filter for a rotary electric machine according to the present invention will be described below with reference to the drawings. However, the part which overlaps with FIG. 3 is omitted. FIG. 1 is a perspective view showing a ventilation filter of a rotary electric machine according to the present invention, and FIG. 2A is a sectional view taken along line AA of FIG.

1 and 2A, a flange portion 1c formed at an upper end of an intake port 1a formed at one side of an upper end of a stator frame 1 of an induction motor has a lower end of a draft filter 5 at a lower end thereof. The formed flange 5a is fixed with a bolt 5b. A rectangular opening 5c is formed on the left side surface of the cover 10 of the ventilation filter 5 in FIG.
Similarly, a rectangular air filter 9 is attached to c by a bolt (not shown).

At the center of the right side surface of the cover 10, the connecting pipe 7
a is pierced, and the central portion of a tubular nozzle 7 whose both ends are sealed is connected to the tip of the connecting pipe 7a.
The tip of the pneumatic rubber hose 12 is inserted into the rear end. On the left side surface of the nozzle 7, a plurality of ejection ports 7b are provided at equal intervals. A right end (not shown) of the pneumatic rubber hose 12 is connected to a pneumatic tank (not shown) of a brake cylinder mounted on the vehicle.

In the ventilation filter for the rotary electric machine constructed as described above, the outside air indicated by the arrow B in FIG. 2A is filtered by the intake fan 4 shown in FIG. The air is sucked into the draft filter 5 through the air blower 9, and is sucked into the stator frame 1 from the intake port 1a as shown by an arrow D in FIG. At this time, most of the dust 11 sucked as shown by the arrow C together with the outside air shown by the arrow B, as shown in FIG.
Of the filter material of the air filter 9 from the middle of the filter medium to the inside of the outside.

Next, when the vehicle stops at the station and the compressed air inside the brake cylinder is discharged before the departure, this compressed air passes through the pneumatic rubber hose 12 to the nozzle 7 inside the draft filter 5. As shown in FIG. 2B, the spout 7 is sent.
It is discharged from b to the inside of the air filter 9. Then,
As shown in FIG. 2A, the dust 11 collected on the outer surface of the filter medium of the air filter 9 or on the outer side of the inside thereof is
The air filter 9 is blown away as shown by the arrow E in FIG.

As a result, in the ventilation filter of the rotary electric machine constructed as described above, the dust adhering to the air filter 9 can be removed and cleaned every time the vehicle is stopped. Not only is it possible to prevent the reduction of cooling air and the overheating of the rotating electric machine due to the adhesion of dust, but it is also possible to secure the air volume of the cooling air even if the density of the fibers of the filter medium used for the air filter 9 is increased. ,
Since the collection efficiency of the filter medium can be maintained at the initial value, it is possible to reduce dust entering the inside of the rotating electric machine and reduce the frequency of disassembling and cleaning the rotating electric machine.

In the ventilation filter 5, as shown in FIG. 4 of the related art, an air filter is provided on the entire outer periphery of the side surface to seal the left and right sides of the nozzle 7 and both ends of the nozzle 7 shown in FIG. A spout may be provided in the central part of the part. In this case, since the area of the air filter is increased, even if the density of the fibers of the filter medium is further increased, the increase of the pressure loss of the air filter can be suppressed. Therefore, the frequency of disassembling / cleaning the rotating electric machine should be further reduced. There is an advantage that

Further, in the above embodiment, the pneumatic rubber hose 12
Was explained with the example of connecting to the pneumatic tank of the brake cylinder, but it may be connected to the pneumatic cylinder that opens and closes the door of the vehicle, or it can be connected to another pneumatic tank and put into the garage every day. The pneumatic valve may be opened.

Further, the pneumatic rubber hoses 12 of each rotating electric machine are collectively arranged up to the side surface of the vehicle, a blind plug is always attached, and a pneumatic rubber hose of a pneumatic pressure source provided in the garage is connected every time the vehicle is loaded. Then, a third invention in which compressed air is ejected from the nozzle 7 may be adopted. In this case, there is an advantage that the ventilation filters of rotating electric machines of all vehicles can be cleaned at once.

As described above, in the ventilation filter of the rotating electric machine of the present invention, before the pressure loss of the air filter increases due to the dust adhering to the air filter, compression is performed from the pneumatic nozzle provided inside the ventilation filter. Blowing air,
The dust collected in the air filter can be blown off to the outside of the air filter to remove it easily, and the dust can be easily removed, reducing the cooling air volume and overheating of the rotating electric machine due to the pressure loss of the air filter. It can be prevented. In the invention according to claim 2, the compressed air to be blown to the air filter is an air pressure source that is no longer needed in the vehicle, so that a ventilation filter for a rotary electric machine for a vehicle that is energy-saving is provided. You can also do it. Further, in the invention according to claim 3, the compressed air source connecting portion to be blown to the air filter is provided on the vehicle side where connection work is easy, so that the air filters of all vehicles are collectively cleaned in a garage or the like. be able to.

As described above, according to the present invention, since dust adhering to the air filter can be easily removed, it is not necessary to perform cleaning including disassembling the rotating electric machine, and a ventilation filter for the rotating electric machine can be easily maintained. Can be obtained.

In the above embodiment, the rotary electric machine to which the ventilation filter is attached is explained as an induction motor.
The same applies to a synchronous electric machine and a DC electric machine as long as it is a rotary electric machine provided with an intake port.

[0029]

As described above, according to the invention described in claim 1,
In a ventilation filter of a rotating electric machine, which is provided at the cooling air intake port of the rotating electric machine and has an air filter attached to the outer periphery, a nozzle that discharges compressed air to the inner surface of the air filter is provided inside the ventilation filter. The dust collected on the air filter is blown outward by the compressed air discharged from the nozzle, and the air volume of the cooling air of the rotating electric machine is secured at the initial value, so the dust adhering to the air filter can be easily removed. It is possible to obtain a ventilation filter for a rotating electric machine.

According to the second aspect of the present invention, there is provided a ventilation filter for a rotary electric machine, which is provided at a cooling air suction port of the rotary electric machine and has an air filter attached to an outer periphery thereof.
By providing a nozzle that discharges the compressed air discharged when the vehicle is stopped to the inner surface of the air filter inside the ventilation filter, the dust collected in the air filter is discharged from the stopped vehicle. Since the compressed air supplied from the air pressure source and discharged from the nozzle is blown to the outside and the air volume of the cooling air of the rotating electric machine is secured to the initial value, the rotating electric machine that can easily remove the dust adhering to the air filter You can get a draft filter.

Further, according to the invention described in claim 3,
A ventilation filter for a rotary electric machine, which is provided at the cooling air intake port of the rotary electric machine and has an air filter attached to the outer periphery thereof.In this ventilation filter, the air pressure source connection part provided on the side surface of the vehicle is connected. By providing a nozzle that discharges compressed air to the inner surface of the air filter, the dust trapped in the air filter is collectively supplied from the air pressure source connected to the air pressure source connection part and discharged from the nozzle. Since it is blown out to the outside by the air and the air volume of the cooling air of the rotating electric machine is secured to the initial value, it is possible to obtain the ventilation filter of the rotating electric machine that can easily remove the dust adhering to the air filter.

[Brief description of drawings]

FIG. 1 is a perspective view showing an embodiment of a ventilation filter for a rotary electric machine according to the present invention.

2A is a cross-sectional view taken along the line AA of FIG. 1, and FIG. 2B is a cross-sectional view showing the action of the ventilation filter of the rotating electric machine of the present invention.

FIG. 3 is a vertical cross-sectional view showing a rotary electric machine to which a ventilation filter of a conventional rotary electric machine is attached.

4 is a partially enlarged perspective view of FIG.

[Explanation of symbols]

1 ... Stator frame, 1a ... Intake port, 2 ... Rotor core, 3A ...
Bearing frame, 3B ... side plate, 4 ... fan, 5 ... draft filter, 6
… Shaft, 7… Nozzle, 9… Air filter, 10… Cover,
11 ... Dust, 12 ... Pneumatic rubber hose, 18 ... Ventilation hole.

Claims (3)

[Claims] 1. A ventilation filter for a rotating electric machine, which is provided at an inlet of cooling air for a rotating electric machine and has an air filter attached to an outer periphery thereof, wherein compressed air is supplied to the inside of the ventilation filter to the inner surface of the air filter. A ventilation filter for a rotating electric machine, which is provided with a discharge nozzle. 2. A ventilation filter for a rotary electric machine, which is provided at a cooling air intake port of the rotary electric machine and has an air filter attached to an outer periphery thereof, wherein compressed air released when a vehicle is stopped is placed inside the ventilation filter. A ventilation filter for a rotating electric machine, characterized in that a nozzle for discharging the air is provided on an inner surface of the air filter. 3. A ventilation filter for a rotary electric machine, which is provided at a cooling air suction port of the rotary electric machine and has an air filter attached to an outer periphery thereof, wherein an air pressure source provided on a side surface of a vehicle inside the ventilation filter. A ventilation filter for a rotating electric machine, comprising a nozzle connected to a connection portion and discharging compressed air to an inner surface of the air filter.