JP2001286088A - Dust-proof motor and interior cleaning device and interior cleaning method therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust-proof motor which enables maintenance and inspection as well as interior cleaning even if its maintenance and inspection is difficult and it is used in a clean environment, and an interior cleaning device and an interior cleaning method for the duct-proof motor. SOLUTION: An introducing inlet and an exhaust outlet of purge gas are provided in an outer frame of a dust-proof motor. The purge gas is introduced into the motor through the purge gas introducing inlet provided in the outer frame of the motor and exhausted through the purge gas exhaust outlet of the motor to purge dust accumulated in the motor and, further, remove dust from the exhausted gas.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electric motor and its maintenance and inspection means, and more particularly to a dustproof electric motor whose inside can be easily cleaned, its internal cleaning device and its internal cleaning method.

[0002]

2. Description of the Related Art A so-called dustproof type motor is used as a motor used for applications which are relatively difficult to maintain and inspect, such as for hoists. In this type of electric motor, a rotor and a stator inside the electric motor are almost completely sealed by an outer frame so that dust and the like do not enter from the outside. In such an electric motor, its original life is determined by thermal deterioration of the insulating film due to a heat cycle and deterioration due to a chemical change due to an internal atmosphere.

[0003] However, even with this type of motor, dust or the like accumulates inside the motor before the life of the motor reaches its original life, causing insulation to be reduced, thereby causing an accident such as a short circuit or ground fault. May occur, and in the worst case, burnout of the electric motor, fire or the like may occur, leading to a situation where production activities cannot be performed for a long period of time. Therefore, it is necessary to perform maintenance and inspection work such as periodic disassembly and cleaning work even in such a dustproof type electric motor.

[0004] Maintenance and inspection work of such a dustproof type electric motor is performed by removing the electric motor from its driven equipment, for example, a hoist, and disassembling it completely, or by carrying out the operation on the driven equipment shown in FIG. Remove the inspection lid 12 provided on the outer frame 1 of the electric motor M shown in (1), perform internal cleaning using various means from the inspection lid 12, and confirm that the insulation state is good. There are many.

However, such maintenance and inspection work has the following problems. First, remove the motor,
Since disassembly, cleaning, and re-installation take a long time, the equipment to be driven cannot be operated during that time, which greatly impedes production activities. Further, when working on the equipment to be driven, only the periphery of the inspection lid 12 can be cleaned, so that the insulation resistance value of the motor cannot be sufficiently recovered. It is conceivable to use a motor cleaner for cleaning.However, the use of a volatile agent is effective in terms of the working environment, and the use of a non-volatile agent is advantageous in terms of drying time after cleaning. Therefore, it is disadvantageous and not practical. Instead of this, a method of purging dust accumulated by a gas such as air can be considered.
It cannot be used in places where a clean environment is required because dust scatters around. Therefore, the means proposed in, for example, Japanese Patent Application Laid-Open No. 5-227702, which is used for a main motor for a railway vehicle, cannot be used for maintenance and inspection work of a dustproof motor.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a dustproof type electric motor which can be easily maintained and inspected together with its internal cleaning even in a clean environment where such maintenance and inspection work is relatively difficult. It is an object to propose an internal cleaning device and an internal cleaning method.

[0007]

The present invention achieves the above object by providing an inlet and an outlet for purge gas in an outer frame of a dustproof motor. In addition, the purge gas is blown into the motor from a purge gas inlet provided in an outer frame of the dustproof type motor to purge dust accumulated in the motor, and the gas discharged from the discharge port is guided to the dust remover to remove dust. By doing so, it is possible to clean the inside of the dustproof motor without scattering harmful substances such as dust into the surrounding environment.

Further, as means for carrying out the above-mentioned cleaning method, a cleaning gas supply pipe for airtightly connecting the internal cleaning device of the dustproof motor to a purge gas inlet provided in an outer frame of the dustproof motor is provided. A purge gas discharge pipe hermetically connected to a purge gas discharge port provided on an outer frame of the dustproof motor, and a dust remover connected to the purge gas discharge pipe.

[0009]

FIG. 1 is a perspective view of a dustproof type electric motor according to the present invention. As shown here, in the present invention, a purge gas inlet 2 and a purge gas outlet 3 are provided in the outer frame 1 of the dustproof motor M.

[0010] The purge gas inlet is a high pressure, for example, 40
This is an opening for introducing compressed air having a pressure of about 0 kPa into the electric motor. As shown in FIG. 2, compressed air sent from a tank (not shown) through a purge gas supply hose 7 And the like, for injecting a purge gas, etc., through the nozzle 4 toward the dust accumulation portion in the electric motor.

The mounting position of the purge gas inlet 2 is not particularly limited, but is provided in a portion of the electric motor that is particularly susceptible to damage due to dust accumulation, for example, a portion where the purge gas can be blown onto the slip ring and its periphery. Is good. The number is not particularly limited, and may be provided as needed.

The attachment position and the number of attachment of the purge gas inlet 2 may be determined according to the actual condition of the cleaning operation by purging the gas. However, its structure requires some precautions. Must not leak from the surrounding area. If the purge gas leaks, the dust that has accumulated in the electric motor scatters around and contaminates a clean environment. Therefore, a tubular rubber attachment 8 is attached to the purge gas inlet 2 as shown in FIG. 3, for example.
It is preferable to take a means for sealing such as pushing the nozzle 4 into it and fixing it with the elasticity of rubber. Also, by using such a rubber attachment, the direction of the nozzle 4 can be freely changed, and the purge gas can be intensively applied to the dust accumulation portion.

The purge gas discharge port 3 is an opening for discharging the purge gas containing dust and the like introduced from the purge gas inlet and accumulating in the motor to the outside. In view of the relationship, dust may be reliably sent to the outside.

In this case, the same attention must be paid to the structure of the purge gas inlet 2 as in the case of the above structure. For example, a steel attachment 9 is fixed to the outer frame 1 as shown in FIG. To this, for example, O-ring seal 1
It is necessary to maintain airtightness, for example, by screwing the connection member 11 with the purge gas discharge pipe 6 with 0 or the like in between.

In order to clean the inside of the dustproof motor M configured as described above, the purge gas is supplied from the purge gas inlet 2 provided in the outer frame 1 of the dustproof motor M as shown in FIG. In addition to purging dust accumulated in the electric motor by blowing air into the motor, the gas discharged from the discharge port 3 is guided to the dust remover 5 to remove dust. By doing so, the dust containing the dust is removed from the gas containing the dust by the purge in the electric motor, and the gas is discharged to the outside as a clean gas, so that the surrounding environment is not polluted. Since the dust remover 5 is used for the above purpose, its dust removing ability may be selected according to a required environmental level.

The purge gas used in this cleaning operation may be any gas that can remove dust accumulated inside the electric motor and take it outside, and may use nitrogen gas or the like in addition to compressed air. About how to blow it,
This may be the same as a normal gas purge, but it is preferable to remove deposits such as dust while observing the inside of the motor as much as possible.

For this reason, for example, an inspection lid 12 provided for inspection of the electric motor is used, and this is replaced with, for example, an observation window 13 made of a transparent acrylic plate. Good to do. In using the observation window made of the acrylic plate, it is desirable to seal the attachment portion with, for example, rubber or felt so that the purge gas does not leak from the attachment portion. Further, a purge gas inlet 2 and a rubber attachment 8 can be provided in the observation window made of an acrylic plate. When the cleaning is not performed, the purge gas inlet and the outlet may be appropriately sealed with a lid or the like. Also, when using the acrylic plate observation window, if there is a concern about problems during operation of the electric motor, such as strength, the acrylic plate observation window is used only during the cleaning operation, and after the cleaning operation is completed, the inspection lid can be replaced. What should be done.

[0018]

EXAMPLE The present invention was applied to a 120-kW nominal dustproof motor mounted on a hoist to clean the inside. Both the purge gas inlet and the purge gas outlet were installed as having an opening of 20 mm in diameter using the inspection lid of the motor. At that time, the inside of the purge gas introduction port side during the cleaning process was facilitated by using the inspection lid as a transparent acrylic observation window. At the purge gas inlet, a thick rubber tube with an outer diameter of 20 mm, a thickness of 5 mm, and a length of 100 mm was attached. The direction of the outlet can be changed freely. On the other hand, a short steel pipe attachment having an outer diameter of 40 mm, a wall thickness of 10 mm, and a length of 30 mm was attached to the purge gas discharge port, and a purge gas discharge pipe of a rubber hose was attached therethrough. As the dust remover, a suction type conductive dust remover was used.

Using the dustproof type motor cleaning device configured as described above, compressed air at a pressure of 392 kPa is blown into the motor from the nozzle to perform a purging operation while directing the nozzle toward the dust accumulation, and to discharge the discharged gas. Dust was removed with a dust remover.

As a result, the motor insulation resistance value was 10 MΩ before cleaning, but recovered to 100 MΩ after cleaning. on the other hand,
No contamination of the purge gas discharged from the dust remover by dust was observed. The total work time required for cleaning including attachment and detachment of the internal cleaning device was 0.5 hours.

On the other hand, in the conventional maintenance / inspection method, that is, the method of removing the motor from the hoist and cleaning the inside from the inspection lid, the motor insulation resistance value is restored only to 20 MΩ, and the motor is removed from the hoist. With the removal method, the total working time was as long as 10 hours. From this, it was confirmed that the cleaning according to the present invention was extremely effective.

[0022]

According to the present invention, dust accumulated inside a dustproof type electric motor can be reliably removed without contaminating the surrounding environment, and an accident due to deterioration of insulation can be prevented. Further, according to the present invention, the above-mentioned maintenance and inspection can be performed in a state where the maintenance and inspection are installed in equipment such as a hoist. As a result, it is possible to greatly reduce the equipment downtime associated with the maintenance and inspection work of the electric motor, and to extend the maintenance and inspection work interval.

[Brief description of the drawings]

FIG. 1 is a perspective view of a dustproof motor according to the present invention.

FIG. 2 is a conceptual diagram illustrating a configuration of an internal cleaning device for a dustproof motor according to the present invention.

FIG. 3 is a sectional view showing details of a cleaning gas inlet provided in an outer frame of the dustproof electric motor according to the present invention.

FIG. 4 is a sectional view showing details of a cleaning gas outlet provided in an outer frame of the dustproof electric motor according to the present invention.

FIG. 5 is a perspective view when a cleaning gas introduction port is provided in an inspection lid of the dustproof motor.

FIG. 6 is a perspective view of a conventional dustproof motor.

[Explanation of symbols]

 1: Outer frame of dustproof type motor 2: Purge gas inlet 3: Purge gas outlet 4: Nozzle 5: Dust remover 6: Purge gas discharge pipe 7: Purge gas feed hose 8: Rubber attachment 9: Steel attachment 10: O-ring seal 11: Connecting member 12: Inspection lid M: Electric motor

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yutaka Sugiyama 1 Kawasaki-cho, Chuo-ku, Chiba-shi, Chiba F-term in Chiba Works, Chiba Works (reference) 3B116 AA47 AB51 BB22 BB72 BB75 BB90 5H605 AA03 BB05 CC01 CC02 DD38 5H615 AA05 AA07 BB01 PP28

Claims (3)

[Claims] 1. A dustproof motor having an outer frame provided with an inlet and an outlet for purge gas. 2. A purge gas supply pipe hermetically connected to an inlet of a purge gas provided in an outer frame of the dustproof motor, and a purge gas discharge hermetically connected to a purge gas outlet provided in an outer frame of the dustproof motor. An internal cleaning device for a dustproof motor, comprising: a pipe; and a dust remover connected to the purge gas discharge pipe. 3. A dust gas is blown into a motor from a purge gas inlet provided in an outer frame of the dustproof motor to purge dust accumulated in the motor, and the purge gas is provided on an outer frame of the dustproof motor. A method for cleaning the inside of a dustproof motor, wherein the dust is discharged from a discharge port and dust is further removed.