JP5618622B2 - Dust collector - Google Patents

Description

  Embodiments described herein relate generally to a dust collector having a temperature control function.

  For a pump installed in a water purification plant or the like, for example, a large rotating electric machine such as a winding induction motor or a DC motor is used. In these winding type induction motors and DC machines, a slip ring is provided on the rotor side, and a brush is arranged so as to always contact the slip ring. For this reason, the brush that comes into contact with the slip ring rotating together with the rotor wears due to rotational friction caused by the rotation of the slip ring, and a large amount of wear powder is generated as dust, which is scattered in the atmosphere. This may have a great adverse effect on the surroundings.

  Therefore, conventionally, in order to prevent dust from the brush from scattering into the atmosphere, the slip ring and the brush are stored in a sealed collector chamber, and the pressure inside the collector chamber is kept at a negative pressure and the dust is discharged to the outside. A dust collecting device is provided.

Japanese Patent Laid-Open No. 3-40735

  However, the temperature inside the collector chamber that houses the slip ring and the brush is always high due to heat generated by the electric circuit resistance between the slip ring and the brush, and the brush temperature is high for a brush mainly composed of carbon. When the temperature exceeds a predetermined value, the wear coefficient increases, brush wear increases, wear progresses faster, and brush maintenance frequency (replacement frequency) increases.

  Embodiments according to the present invention have been made in view of the above circumstances, and an object thereof is to provide a dust collector having a good temperature control function as well as a dust collection function.

To solve the above problem,
According to the first aspect of the present invention, a dust collector main body that collects the dust by wind generated by taking outside air into a space where dust is generated and holding the inside of the space at a negative pressure, and detecting a temperature inside the space First temperature detecting means for controlling the temperature inside the space by automatically controlling the amount of outside air taken into the space in accordance with the temperature detected by the first temperature detecting means. It is characterized by having.
Further, the invention of claim 1 is characterized in that a brush of a rotating electrical machine is housed in the space, and the dust collector main body collects dust generated from the brush inside the space, and the air volume of the air passage. An air volume adjusting means for adjusting, and the temperature control means adjusts the air volume of the ventilation path by the air volume adjusting means according to the temperature detected by the first temperature detecting means, and takes the outside air into the space. It is characterized by controlling the amount.

  A second aspect of the present invention is the method according to the first aspect, wherein a brush of a rotating electric machine is accommodated in the space, and the dust collector main body is a ventilation path for collecting dust generated from the brush in the space. And an air volume adjusting means for adjusting the air volume of the ventilation path, wherein the temperature control means adjusts the air volume of the ventilation path by the air volume adjusting means according to the temperature detected by the first temperature detecting means, and the space. It is characterized by controlling the amount of outside air taken into the interior.

  According to a third aspect of the present invention, in the second aspect, the air volume adjusting means comprises an air volume adjusting damper provided in the ventilation path, and the temperature control means is set to a temperature detected by the first temperature detecting means. Accordingly, the air volume adjustment by the air volume adjusting damper is controlled.

  According to a fourth aspect of the invention, there is provided the second aspect of the invention according to the second aspect, further comprising second temperature detecting means for detecting the temperature of the outside air, wherein the temperature control means is in accordance with the detected temperature of the first temperature detecting means. The air volume of the ventilation path by the adjusted air volume adjusting means can be corrected by the temperature detected by the second temperature detecting means.

  According to a fifth aspect of the present invention, in the second aspect of the invention, the air volume adjusting means includes air blowing means capable of adjusting the air volume of the ventilation path, and the air flow adjusting means is in accordance with the detected temperature of the first temperature detecting means. It is characterized by controlling the amount of air blown by the means.

The figure which shows schematic structure of the dust collector of the 1st Embodiment of this invention. The figure which shows schematic structure of the dust collector of the 2nd Embodiment of this invention. The figure which shows schematic structure of the dust collector of the 3rd Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described in detail.

(First embodiment)
FIG. 1 shows a schematic configuration when the dust collector according to the first embodiment of the present invention is applied to a winding induction motor as a rotating electric machine.

  In FIG. 1, reference numeral 1 denotes a winding induction motor. The winding induction motor 1 has a housing 2 having a substantially cylindrical shape. The housing 2 includes a stator 3 having a stator winding 3a provided on the inner peripheral surface of the hollow portion, and the rotor 4 provided with the rotor winding 4a is rotatably disposed in the hollow portion of the stator 3. Has been. In this case, the rotor 4 has a rotation shaft 5, and the rotation shaft 5 is held by end brackets 2 a and 2 b provided at both ends of the housing 2 via bearings 6 a and 6 b so as to be rotatable.

  A slip ring 7 is provided on the rotary shaft 5. The slip ring 7 is electrically connected to the rotor winding 4 a of the rotor 4. A brush 8 is disposed corresponding to the slip ring 7. The brush 8 is brought into contact with the slip ring 7 with a predetermined pressing force by an unillustrated elastic member, and an electric circuit for the slip ring 7 is formed. Further, the brush 8 is electrically connected to a terminal (not shown) disposed outside the housing 2.

  The interior of the housing 2 is partitioned by a partition plate 91, and a space in which the slip ring 7 and the brush 8 are disposed is formed as a collector chamber 9. The partition plate 91 is also for preventing the dust B generated from the brush 8 from going to the space side where the stator 3 and the rotor 4 are arranged.

  The housing 2 is formed with a plurality of openings 10 penetrating into the collector chamber 9. These openings 10 are for taking outside air into the collector chamber 9. The housing 2 has a discharge port 11 formed therein. A wind tunnel 12 communicates with the discharge port 11 as a ventilation path, and a dust collector main body 13 is connected through the wind tunnel 12. The wind tunnel 12 sends dust B generated from the brush 8 inside the collector chamber 9 to the dust collector main body 13 side by blowing air through the discharge port 11. The wind tunnel 12 here constitutes a part of the dust collector main body 13.

  The dust collector main body 13 collects the dust B by holding the inside of the collector chamber 9 at a negative pressure by taking outside air through the opening 10 into the collector chamber 9 where the dust B is generated. It has a damper 17 as air volume adjusting means and a temperature control unit 18 as temperature control means.

  The dust collection unit 14 includes a dust collection chamber 15 and a dust collection fan 16 as a blowing unit, and the dust collection chamber 15 is connected to the wind tunnel 12 via a damper 17. The dust collecting fan 16 rotates at a constant speed to generate a wind in the direction indicated by the arrow A in the wind tunnel 12, takes outside air into the collector chamber 9 through the opening 10, and always maintains the inside of the collector chamber 9 at a negative pressure. Let The dust collection chamber 15 has a filter 15a, and the dust B in the collector chamber 9 is taken together with air by the wind in the direction of the arrow A shown in the wind tunnel 12, and only the air is discharged outside through the filter 15a. To collect dust B. The damper 17 is driven by the damper driving unit 17a and can change the cross-sectional area of the wind tunnel 12. The air volume in the wind tunnel 12 can be adjusted by changing the cross-sectional area at this time. The temperature control unit 18 controls the temperature inside the collector chamber 9, and the temperature inside the collector chamber 9 detected by the preset temperature T 0 set in advance as a predetermined temperature and the temperature sensor 19 as the first temperature detecting means. T1 is given, and a control signal for the damper drive unit 17a is generated according to the comparison result between the set temperature T0 and the temperature T1, and the air volume in the wind tunnel 12 is adjusted by the damper 17 to allow the outside air to enter the collector chamber 9 The intake amount is controlled so that the internal temperature of the collector chamber 9 always becomes the set temperature T0. In this case, the set temperature T0 is set to a temperature at which the optimum friction coefficient can be maintained for the brush 8 in the collector chamber 9 to suppress the progress of wear. As the set temperature T0, an optimum value that differs depending on the type of the brush 8 or the like is prepared.

  Next, the operation of the embodiment configured as described above will be described.

  Now, in the state where the rotor 4 is rotating with respect to the stator 3 of the winding induction motor 1, the brush 8 that contacts the slip ring 7 provided on the rotating shaft 5 is accompanied by the rotation of the slip ring 7. Sliding wear occurs due to rotational friction, and wear powder is generated. The wear powder fills the collector chamber 9 as dust B.

  In the dust collector main body 13, the dust collecting fan 16 of the dust collecting unit 14 is rotated at a constant speed, and wind in the direction indicated by the arrow A is generated in the wind tunnel 12. As a result, outside air is taken into the collector chamber 9 through the opening 10 and the inside of the collector chamber 9 is always kept at a negative pressure. In this state, the dust B in the collector chamber 9 is discharged from the discharge port 11 by the wind generated in the wind tunnel 12 into the dust collecting chamber 15 and is taken in along with the air through the wind tunnel 12, and only air is filtered. Dust B is collected by being discharged outside through 15a.

  A temperature T 1 inside the collector chamber 9 detected by the temperature sensor 19 is input to the temperature control unit 18. The temperature control unit 18 compares the temperature T1 inside the collector chamber 9 detected by the temperature sensor 19 with a preset set temperature T0, and outputs the comparison result to the damper drive unit 17a of the damper 17 as a control signal. . The damper 17 is driven by a damper driving unit 17 a in accordance with a control signal from the temperature control unit 18, and changes the cross-sectional area of the wind tunnel 12 to adjust the air volume in the wind tunnel 12. Thereby, the amount of outside air taken into the collector chamber 9 is adjusted according to the air volume in the wind tunnel 12 at this time, and the internal temperature of the collector chamber 9 is controlled.

  Here, when the temperature T1 inside the collector chamber 9 is high, the temperature control unit 18 controls the damper 17 so as to increase the air volume in the wind tunnel 12 to increase the amount of outside air taken into the collector chamber 9. Control is performed so as to lower the temperature T1 inside the collector chamber 9, and conversely, when the temperature T1 inside the collector chamber 9 is low, the damper 17 is controlled so as to reduce the air volume inside the wind tunnel 12, and the collector chamber 9 is moved into the interior. The amount of outside air taken in is controlled so as to increase the temperature T1 inside the collector chamber 9. Thereby, the temperature in the collector chamber 9 is always adjusted to the set temperature T0, that is, the predetermined temperature at which the optimum friction coefficient for suppressing the progress of wear can be maintained for the brush 8.

  Therefore, according to such an embodiment, the dust collecting section 14 having the dust collecting chamber 15 and the dust collecting fan 16 in the collector chamber 9 that houses the slip ring 7 and the brush 8 of the winding induction motor 1 through the wind tunnel 12. Are connected, and wind is generated in the wind tunnel 12 by the dust collecting fan 16 and the outside air is taken into the collector chamber 9 to keep the inside of the collector chamber 9 at a negative pressure. In this state, the dust B generated from the brush 8 is removed. In the dust collecting chamber 15 through the wind tunnel 12, a damper 17 is provided in the wind tunnel 12, and a collector that is detected by the temperature sensor 19 from a preset temperature T 0 that is preset by the temperature control unit 18. The temperature T1 inside the chamber 9 is compared, and the amount of outside air taken into the collector chamber 9 is controlled by adjusting the amount of air inside the wind tunnel 12 by the damper 17 according to the comparison result. Temperature, here was so controlled to be the set temperature T0. Thereby, the dust B generated from the brush 8 in the collector chamber 9 can be collected in the dust collecting chamber 15 of the dust collecting section 14, and the internal temperature of the collector chamber 9 is always set to the set temperature T0, that is, in the collector chamber 9. Since the optimum friction coefficient that can suppress the progress of sliding wear can be adjusted to a temperature that can be maintained, the life of the brush 8 can be extended, and the maintenance frequency (replacement frequency) can be kept low.

(Second Embodiment)
FIG. 2 shows a schematic configuration when the dust collector according to the second embodiment of the present invention is applied to a wound induction motor. Here, in FIG. 2, the same parts as those in FIG.

  In the second embodiment, a temperature sensor 20 is provided as second temperature detection means for detecting the outside air temperature outside the collector chamber 9 of the wound-type induction motor 1. This temperature sensor 20 is preferably arranged in the vicinity of the opening 10 of the collector chamber 9 in order to detect the temperature of the outside air taken into the collector chamber 9 as accurately as possible.

  The temperature T2 detected by the temperature sensor 20 is given to the temperature control unit 18. The temperature control unit 18 corrects the comparison result between the preset temperature T0 set in advance to a predetermined temperature and the temperature T1 inside the collector chamber 9 detected by the temperature sensor 19 by using the temperature T2 detected by the temperature sensor 20 to provide a damper. 17 control signals are generated. For example, when the outside air temperature is high and the temperature T1 inside the collector chamber 9 is high, correction is performed so as to suppress the amount of outside air taken into the collector chamber 9 by adjusting the air volume inside the wind tunnel 12 by the damper 17, When the temperature T1 inside the collector chamber 9 is low, correction is made so as to increase the amount of outside air taken into the collector chamber 9 by adjusting the air volume in the wind tunnel 12 by the damper 17. Further, when the outside air temperature is low and the temperature T1 inside the collector chamber 9 is high, the amount of outside air taken into the collector chamber 9 is corrected by adjusting the air volume inside the wind tunnel 12 by the damper 17, and conversely When the temperature T1 in the collector chamber 9 is low, correction is performed so as to suppress the amount of outside air taken into the collector chamber 9 by adjusting the air volume in the wind tunnel 12 by the damper 17.

  Even in this case, the same effect as in the first embodiment can be obtained, and the amount of outside air taken into the collector chamber 9 can be further adjusted by the outside air temperature, that is, the outside air temperature T2 detected by the temperature sensor 20. Since the temperature inside the collector chamber 9 can be precisely and precisely controlled, the temperature inside the collector chamber 9 can always be adjusted to a temperature at which the optimum coefficient of friction for the brush 8 can be maintained. it can.

(Third embodiment)
FIG. 3 shows a schematic configuration when the dust collector according to the third embodiment of the present invention is applied to a winding induction motor. Here, in FIG. 3, the same parts as those in FIG.

  In this case, in the third embodiment, the damper 17 shown in FIG. 2 is deleted. The temperature control unit 18 is connected with an inverter 21 and a dust collecting fan 22 as air volume adjusting means. In this case, the inverter 21 controls the rotational speed of the dust collecting fan 22 based on the control signal of the temperature control unit 18. For example, when the temperature T1 inside the collector chamber 9 is high, the inverter 21 increases the rotational speed of the dust collecting fan 22 to increase the amount of air in the wind tunnel 12 and increase the amount of outside air taken into the collector chamber 9 to increase the collector volume. When the temperature T1 inside the collector chamber 9 is low, conversely, when the temperature T1 inside the collector chamber 9 is low, the rotational speed of the dust collecting fan 22 is lowered by the inverter 21 to reduce the air volume in the wind tunnel 12, Control is performed such that the amount of outside air taken into the collector chamber 9 is reduced and the temperature T1 inside the collector chamber 9 is raised.

  Also in this case, as described in the second embodiment, the temperature control unit 18 obtains a comparison result between the preset temperature T0 set in advance to a predetermined temperature and the temperature T1 inside the collector chamber 9 detected by the temperature sensor 19. The control signal for the inverter 21 is generated by correcting the temperature T2 detected by the temperature sensor 20.

  Even if it does in this way, since the effect similar to 1st Embodiment can be acquired, Furthermore, since an air volume adjustment means can be comprised by the inverter 21 and the dust collecting fan 22, it is simple and can be comprised as an air volume adjustment means, and the apparatus is small. Can be realized.

  Needless to say, the third embodiment can also be applied to a device not provided with the temperature sensor 20 for detecting the temperature of the outside air.

  In addition, this invention is not limited to the said embodiment, In an implementation stage, it can change variously in the range which does not change the summary. In the embodiment described above, the winding induction motor is described as the rotating electrical machine, but the present invention can also be applied to a DC motor having a brush. In addition, the dust collector of the present invention is not limited to the rotating electrical machine, and it is necessary to control the temperature inside the space to a predetermined temperature at the same time that the dust inside the space that generates dust is collected by the dust collector. Of course, it can be applied to devices other than the rotating electrical machine.

  Furthermore, the above embodiments include inventions at various stages, and various inventions can be extracted by appropriately combining a plurality of disclosed constituent elements. For example, even if some constituent requirements are deleted from all the constituent requirements shown in the embodiment, the problem described in the column of the problem to be solved by the invention can be solved, and is described in the column of the effect of the invention. If the above effect is obtained, a configuration from which this configuration requirement is deleted can be extracted as an invention.

DESCRIPTION OF SYMBOLS 1 ... Winding type induction motor, 2 ... Housing 3 ... Stator, 4 ... Rotor, 5 ... Rotating shaft 7 ... Slip ring, 8 ... Brush 9 ... Collector chamber, 10 ... Opening part, 11 ... Discharge port 12 ... Wind tunnel, DESCRIPTION OF SYMBOLS 13 ... Dust collector main body, 14 ... Dust collecting part 15 ... Dust collecting chamber, 15a ... Filter 16 ... Dust collecting fan, 17 ... Damper, 18 ... Temperature control part 19 ... Temperature sensor, 20 ... Temperature sensor, 21 ... Inverter 22 ... Dust collector fan

Claims (4)

A dust collector main body that collects the dust by wind generated by taking outside air into a space where dust is generated and holding the inside of the space at a negative pressure;
First temperature detecting means for detecting the temperature inside the space;
Temperature control means for automatically controlling the amount of outside air taken into the space and controlling the temperature inside the space according to the detected temperature of the first temperature detecting means;
Equipped with,
The space contains a brush of a rotating electrical machine, and the dust collector body has a ventilation path for collecting dust generated from the brush inside the space, and an air volume adjusting means for adjusting the air volume of the ventilation path. And
The temperature control means controls the amount of outside air taken into the space by adjusting the air volume of the ventilation path by the air volume adjusting means in accordance with the temperature detected by the first temperature detecting means. Dust collector. The air volume adjusting means is composed of an air volume adjusting damper provided in the ventilation path,
2. The dust collecting apparatus according to claim 1, wherein the temperature control unit controls air volume adjustment by the air volume adjusting damper according to a temperature detected by the first temperature detecting unit . Furthermore, it has the 2nd temperature detection means which detects the temperature of external air,
The temperature control means is configured to be able to correct the air volume of the ventilation path by the air volume adjusting means adjusted according to the temperature detected by the first temperature detecting means by the temperature detected by the second temperature detecting means. The dust collector according to claim 1, wherein The air volume adjusting means, claims, characterized in that the air volume of the ventilation passage has an adjustable blowing means, for controlling the air volume by the air blowing means according to the detected temperature of the first temperature sensing means The dust collector according to 1 .

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