JPH0953636A - Heat insulating device for bearing of hoisting motor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heat insulating device of the bearing for a hoisting motor capable of preventing the grease in the bearing of a hoisting motor in a cold district from hardening. SOLUTION: A heat insulating device for a bearing is provided with a heating section 10 which encloses the tip of a motor shaft 3 therein with the heat insulating device fixed to a hoisting motor, and one end of the heating wire of the heating section 10 is connected to a temperature controlling section 9 for setting the temperature range of the heating section 10. The temperature controlling section 9 is connected to a temperature detector 8. The temperature detector 8 indirectly detects the temperature of a bearing by detecting the surface temperature of the hoisting motor, and the temperature controller 9 controls the voltage application to the heating section 10 based on this detected temperature according to the preset temperature. Therefore, the temperature of the bearing can be kept constant, allowing the prevention of the grease hardened in the bearing caused by the lowering of the outside air temperature when it is colt. This prevent the bearing from generating abnormal sound and heating.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a bearing heat insulation device for a hoisting motor, and more particularly to a bearing heat insulation device for a hoisting electric motor that protects the bearings of the hoisting motor in cold regions, for example, prevents hardening of grease inside the bearing.

[0002]

2. Description of the Related Art A hoisting electric motor is generally installed in a machine room on the uppermost floor of an elevator, and is a power source for hoisting or rewinding a rope attached to an upper part of an elevator car to raise or lower the elevator car. . Usually, the hoisting motor has a structure as shown in FIG. That is, the hoisting electric motor 1 has a hoisting electric motor shaft 3 (hereinafter abbreviated as “electric motor shaft 3”) for hoisting or rewinding a rope, and one end of the electric motor shaft 3 is supported by a bearing 2 An electromagnetic brake 4 is attached to the other end of the shaft 3. The electromagnetic brake 4 includes a brake lining 5 and a brake wheel 6.

The hoisting motor 1 rotates an electric motor shaft 3 in response to an elevator drive command from a control panel installed in a machine room. Then, the rotation of the electric motor shaft 3 causes the rope for suspending the car to be hoisted or rewound, and the car of the elevator is moved up and down. On the other hand, when the operation of the elevator is stopped, the brake lining 5 is pressed against the brake wheel 6 by stopping the excitation of the electromagnetic brake 4 of the hoisting electric motor 1, and the rotation of the electric motor shaft 3 is stopped. This stops the operation of the elevator.

Normally, grease is supplied to the inside of the bearing 2. As a result, the motor shaft 3 of the hoisting motor 1
Rotates smoothly.

[0005]

However, the grease inside the bearing 2 gradually becomes cold due to the cold weather at cold spots, such as condominiums, restaurant buildings, and office buildings where elevators are rarely used during the year-end and New Year holidays. It hardens to.
For this reason, since the grease is not lubricated inside the bearing 2, for example, when the motor shaft 3 rotates, abnormal bearing noise may be generated from the bearing 2, heat may be generated, and the bearing may be damaged.

Conventionally, when an abnormal noise is generated from the bearing 2 of the hoisting electric motor 1, the bearing 2 is silenced by replenishing the bearing 2 with grease. However, when the supplied grease is cooled and hardened by the outside air, the grease is not lubricated inside the bearing 2, and thus the grease hardening is similarly repeated.

The present invention has been made in view of the above problems, and an object thereof is to protect a bearing of a hoisting electric motor in cold regions and prevent hardening of grease in the bearing of the hoisting electric motor. The present invention is to provide a bearing heat insulating device.

[0008]

In order to solve the above problems, the bearing heat retaining device for a hoisting electric motor according to the present invention has the following features.

(1) A bearing heat retaining device mounted at a position close to the tip of an electric motor shaft protruding from the surface of the hoisting electric motor, wherein the temperature detecting portion detects the temperature of the bearing of the hoisting electric motor, and the bearing. A heating unit that heats the bearing via the electric motor shaft in accordance with the temperature.

Since the bearing temperature of the hoisting electric motor is detected and the bearing is heated via the electric motor shaft according to the bearing temperature to keep the bearing at a constant temperature, the grease inside the bearing is not hardened. . Therefore, since the motor shaft rotates smoothly, generation of abnormal noise and heat generation can be prevented.

(2) In the bearing heat retention device described in (1) above, there is further provided a temperature adjusting section for setting the temperature region of the heating section.

Since the bearing is appropriately heated and kept warm by the temperature adjusting portion, the lubricity of the grease can be kept suitable. Therefore, since the motor shaft rotates smoothly,
It is possible to prevent generation of abnormal sound and heat generation.

(3) In the bearing heat retention device according to (1) or (2) above, there is further provided a fixing portion for fixing the bearing heat retention device to the hoisting electric motor, and the fixing portion is the bearing heat retention device. It is composed of two or more fixed arms extending from the main body to the hoisting electric motor with their backs facing each other.

Since the bearing heat retaining device can be attached to and detached from the hoisting motor by the fixing portion, the bearing heat retaining device may be installed only in cold regions, and when it is not necessary to heat the bearing in the summer, the bearing heat retaining device is not required. The device can be removed.

(4) In the bearing heat retention device according to (1) or (2) above, a bearing magnet is further provided in the bearing heat retention device for joining the bearing heat retention device to the bearing.

Since the bearing heat retaining device can be joined to the bearing by the magnet for joining, the bearing heat retaining device can be easily mounted and the workability is improved.

[0017]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a preferred embodiment of the present invention will be described.

Embodiment 1. FIG. 1 is a diagram showing an internal configuration of a first embodiment of the bearing heat retention device according to the present invention. FIG.
FIG. 1 is a front view of a first embodiment of a bearing heat retention device according to the present invention. Further, FIG. 3 is a diagram showing an overall configuration when the bearing heat retention device according to the first embodiment of the present invention is set on a hoisting motor. The same components as those of the conventional hoisting motor are designated by the same reference numerals and the description thereof will be omitted.

The shape of the bearing heat retaining device of this embodiment is shown in FIG.
As shown in FIG. 5, it has the same shape as the conventional hoisting motor bearing cover, and is mounted at a position close to the tip of the motor shaft 3 protruding from the surface of the hoisting motor 1. As shown in FIGS. 2 and 3, the bearing heat retaining device is diagonally screwed to the hoisting motor 1 by using, for example, four mounting bolts. Therefore, the bearing heat insulation device of the present embodiment has a function of protecting the hoisting motor shaft itself, like the conventional hoisting motor bearing cover.

Further, as shown in FIG. 1, inside the bearing heat retaining device of this embodiment, a heating wire is provided so as to surround the tip of the motor shaft 3 when the bearing heat retaining device is mounted on the hoisting motor. A heating unit 10 is provided. A conducting wire extending from one end of the heating wire of the heating unit 10 is connected to one terminal of the switch unit of the temperature adjusting unit 9 that sets the temperature region of the heating unit 10. The conducting wire extending from the other terminal of the switch unit of the temperature adjusting unit 9 is put together with the other end of the heating wire of the heating unit 10 in the power supply unit 7, and passes through the power supply unit 7 to AC1.
It is connected to an outlet for 00V. In addition, the temperature detector 8
Is joined to the inner wall of the bearing heat retention device of the present embodiment and is electrically connected to the thermometal which is a bimetal of the switch part of the temperature adjusting part 9. Therefore, according to the temperature detected by the temperature detecting unit 8, the thermometal in the temperature adjusting unit 9 contacts both terminals, and the temperature adjusting unit 9 is turned ON / OF.
F As a result, the temperature adjusting unit 9 controls the voltage application to the heating unit 10.

Next, the operation of the bearing heat insulation device of this embodiment will be described.

Assuming that the temperature adjusting section 9 has a heating section 10
It is assumed that the temperature region of is set to 5 ° C to 30 ° C.
Here, the temperature detection unit 8 determines that the surface temperature of the hoisting motor 1 is 5
When it is detected that the temperature of the bearing 2 is lower than 5 ° C, that is, the temperature of the bearing 2 is lower than 5 ° C, the thermometal in the temperature adjusting unit 9 contacts both terminals, a voltage is applied to the heating unit 10 through the power supply 7, and the heating wire is heated. Heats up. This heat is transmitted to the motor shaft 3 and further to the bearing 2 via the motor shaft 3. This prevents the grease inside the bearing 2 from hardening. On the other hand, when the temperature of the bearing 2 rises by heating and exceeds 30 ° C, the surface temperature of the hoisting motor 1 near the bearing 2 also exceeds 30 ° C. When the temperature detecting unit 8 detects that the temperature exceeds 30 ° C., the thermometal in the temperature adjusting unit 9 separates from both terminals, the voltage application from the power source 7 to the heating unit 10 is stopped, and the heating of the heating wire is stopped. As a result, heat conduction from the motor shaft 3 to the bearing 2 is stopped.

As shown in FIG. 3, the bearing heat retaining device of this embodiment is fixed to the hoisting motor 1. Therefore, the bearing heat retention device of the present embodiment has the same temperature as the surface temperature of the hoisting motor 1 due to heat conduction from the surface of the hoisting motor 1.
As a result, the inner wall of the bearing heat retaining device is also at the same temperature as the surface temperature of the hoisting electric motor 1. Therefore, as shown in FIG. The surface temperature of 1 can be detected. on the other hand,
Since the temperature of the bearing 2 is substantially equal to the surface temperature of the hoisting motor 1, the temperature detection unit 8 indirectly detects the temperature of the bearing 2.

Through the series of operations described above, the bearing 2 can be maintained at a constant temperature, and the grease inside the bearing 2 can be prevented from hardening due to the decrease in the outside temperature during cold weather. Therefore, generation of abnormal sound from the bearing 2 and heat generation of the bearing 2 can be prevented, and further damage to the bearing 2 can be prevented, so that the life of the bearing can be extended.

Embodiment 2. FIG. 4 (a) is a side view of the second embodiment of the bearing heat retention device according to the present invention.
(B) is a front view of a second embodiment of the bearing heat retention device according to the present invention. Further, FIG. 5 is a diagram showing an overall configuration when the bearing heat retention device according to the second embodiment of the present invention is set on a hoisting motor. Further, FIG. 9 is a diagram showing the overall configuration of a hoisting electric motor with a flywheel. Incidentally, the same constituent requirements as those of the conventional hoisting motor and the first embodiment described above,
The same reference numerals are given and the description thereof is omitted.

In the case of a hoisting electric motor with a flywheel as shown in FIG. 9, since the flywheel 11 is attached to the tip of the electric motor shaft 3 of the hoisting electric motor 1, the above first motor is used.
The bearing heat retention device described in the embodiment cannot be mounted on the motor shaft 3.

Therefore, the bearing heat retention device of this embodiment has a structure that can be mounted in a position close to the motor shaft 3 exposed in the gap between the hoisting motor 1 and the flywheel 11. That is, the bearing heat retention device of the present embodiment has the structure shown in FIG.
As shown in (b), two fixed arms 12 are provided, which extend from the bearing heat retention device main body toward the hoisting electric motor with their backs facing each other. Therefore, when mounting the bearing heat retaining device on the hoisting motor, loosen the diagonal mounting bolts of the conventional hoisting motor bearing cover, bring the bearing heat retaining device close to the side surface of the motor shaft 3, and then install the bearing heat retaining device on both sides. Fixed arm 1
The bearing heat retaining device can be attached to the hoisting motor by inserting the tip of 2 and tightening the bolt. Further, in the bearing heat insulating device of the present embodiment, when the bearing heat insulating device is mounted on the electric motor shaft 3, the heating portion formed of a heating wire is arranged so as to substantially cover the entire side surface circumference of the electric motor shaft 3. In addition, as shown in FIG. 4 (a), after the bearing heat retaining device is mounted on the hoisting motor, the temperature adjusting unit sets the temperature region of the heating unit by the temperature adjusting unit. It is provided.

Therefore, the bearing is appropriately heated and kept warm, so that the lubricity of the grease can be kept suitable. Therefore, since the motor shaft rotates smoothly, generation of abnormal noise and heat generation can be prevented. Furthermore, since the bearing insulation device can be attached to and detached from the hoisting motor, it is sufficient to install the bearing insulation device only in cold regions.If it is not necessary to retain the bearing insulation in the summer, the bearing insulation device can be removed. it can.

Embodiment 3. FIG. 6A is a front view of the bearing heat retention device according to the third embodiment of the present invention.
(B) is a side view of a third embodiment of the bearing heat retention device according to the present invention. Further, FIG. 7 is a diagram showing the overall configuration when the bearing heat retention device of the third embodiment according to the present invention is set on a hoisting motor. Further, FIG. 9 is a diagram showing the overall configuration of a hoisting electric motor with a flywheel. The same components as those of the conventional hoisting motor and the above-described first and second embodiments are designated by the same reference numerals, and the description thereof will be omitted.

As described above, in the case of a hoisting electric motor with a flywheel as shown in FIG. 9, since the flywheel 11 is attached to the tip of the electric motor shaft 3 of the hoisting electric motor 1, the first embodiment described above is adopted. The bearing heat retention device described in 1. cannot be mounted on the motor shaft 3.

Therefore, the bearing heat insulation device of this embodiment is mounted at a position close to the motor shaft 3 exposed between the hoisting motor 1 and the flywheel 11. Therefore, in the bearing heat retention device of the present embodiment, as shown in FIGS. 6 (a) and 7, in order to bond the bearing heat retention device to the bearing 2, the joining magnets 13 have four corners of the joint surface of the bearing heat retention device. It is located in.

This makes it possible to provide a bearing heat retaining device which can be easily attached and detached, and facilitates work such as mounting the bearing heat retaining device.

[0033]

As described above, according to the bearing heat insulation device of the present invention, the temperature of the bearing of the hoisting electric motor is detected, and the bearing is heated via the electric motor shaft in accordance with the bearing temperature to keep the temperature constant. Since the bearing is kept at the temperature, the grease inside the bearing will not harden. Therefore, since the motor shaft rotates smoothly, it is possible to prevent abnormal noise and heat generation from the bearing.

Further, since the bearing is appropriately heated and kept warm by the temperature adjusting portion, the lubricity of the grease can be kept suitable. Therefore, since the motor shaft rotates smoothly, generation of abnormal noise and heat generation from the bearing can be prevented.

Further, since the bearing heat retaining device can be attached to and detached from the hoisting motor by the fixing portion, it is sufficient to mount the bearing heat retaining device only in a cold region, and when it is not necessary to heat the bearing in the summer, The bearing insulation can be removed.

Further, since the bearing heat retaining device is joined to the bearing by the joining magnet, the bearing heat retaining device can be easily mounted and the workability is improved.

[Brief description of drawings]

FIG. 1 is a diagram showing an internal configuration of a first embodiment of a bearing heat retention device according to the present invention.

FIG. 2 is a front view of the first embodiment of the bearing heat retention device according to the present invention.

FIG. 3 is a diagram showing an overall configuration when the bearing heat retention device according to the first embodiment of the present invention is set on a hoisting motor.

FIG. 4 is a side view and a front view of a second embodiment of the bearing heat retention device according to the present invention.

FIG. 5 is a diagram showing an overall configuration when a bearing heat retention device according to a second exemplary embodiment of the present invention is set on a hoisting motor.

FIG. 6 is a front view and a side view of a third embodiment of the bearing heat retention device according to the present invention.

FIG. 7 is a diagram showing an overall configuration when a bearing heat retention device according to a third embodiment of the present invention is set on a hoisting motor.

FIG. 8 is a diagram showing an overall configuration of a conventional hoisting motor.

FIG. 9 is a diagram showing an overall configuration of a hoisting electric motor with a flywheel.

[Explanation of symbols]

1 hoisting motor, 2 bearings, 3 hoisting motor shaft, 4 electromagnetic brake, 5 brake lining, 6 brake wheel, 7 power supply section, 8 temperature detecting section, 9 temperature adjusting section,
10 heating part, 11 flywheel.

Claims (4)

[Claims] 1. A bearing heat retaining device mounted at a position close to a tip of an electric motor shaft protruding from a surface of a hoisting electric motor, the temperature detecting unit detecting a temperature of a bearing of the hoisting electric motor; A bearing heat retaining device for a hoisting electric motor, comprising: a heating unit that heats the bearing via the electric motor shaft according to temperature. 2. The bearing heat retaining device according to claim 1, further comprising a temperature adjusting unit that sets a temperature region of the heating unit. 3. The bearing heat retaining device according to claim 1, further comprising a fixing portion for fixing the bearing heat retaining device to the hoisting electric motor, wherein the fixing portion includes a bearing heat retaining device main body. A bearing heat insulation device for a hoisting electric motor, comprising two or more fixed arms extending back to each other toward the hoisting electric motor. 4. The bearing heat retaining device according to claim 1, further comprising a joining magnet provided in the bearing heat retaining device for joining the bearing heat retaining device to the bearing. Bearing heat insulation device for hoisting motor.