JP2006097645A - Immersion detecting device for underwater rotating machine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an immersion detecting device for an underwater rotating machine, capable of stably detecting immersion quantity regardless of it is during operation or stop time. <P>SOLUTION: A submersible pump 1 is provided with an oil chamber 4, a mechanical seal 10 disposed through the oil chamber 4 to a drive shaft 3a, and an electrode type immersion detector 14 to detect water penetrating into the oil chamber. In a lower part of the oil chamber 4, below a coil spring 10e of the mechanical seal 10, a partition wall 12 is provided to part an agitation range 4b on the upper side from a hard-to-agitate range 4c. In the partition wall 12, a communication hole 12a is formed to communicate the agitation range 4b with the hard-to-agitate range 4c. In the hard-to-agitate range 4c, the electrode type immersion detector 14 is provided. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an inundation detection device in an underwater rotating device such as an underwater pump or a stirrer used for preventing sludge settling in a sewage treatment process, destruction of floating scum, sewage treatment in the food industry, stagnation of pond lake water, etc. is there.

  For example, a submersible pump includes a pump unit and a motor unit that drives the pump unit. In order to prevent water from entering the motor chamber in which the rotor and the stator in the motor unit are arranged, the motor chamber and the pump unit are mutually connected. The oil chamber in which a mechanical seal is disposed is interposed therebetween.

  In addition, the intrusion detector detects water ingress into the oil chamber in advance and contributes to the judgment of maintenance time such as oil replacement time and seal inspection time. There has been a structure that prevents any damage (for example, see Patent Document 1).

  That is, a sleeve is provided that surrounds the periphery of the rotating shaft arranged in a penetrating manner with a radial interval, and an inner chamber configured around the rotating shaft by the sleeve and the sleeve The inner chamber and the outer chamber are configured to communicate with each other through a communication path formed in the sleeve.

  In addition, the oil case constituting the oil chamber is used as one ground electrode, and the wiring electrode arranged in the outer chamber is used as the other electrode. An inundation detection device is configured to detect the amount of infiltration that has entered the oil by detecting a leakage current flowing between them.

  When water enters the inner chamber from the mechanical seal portion during the pump operation, the intruded water is stirred together with the oil in the oil chamber as the rotating shaft and the mechanical seal rotate. Water particles are moved to the outer sleeve side by the centrifugal force accompanying the stirring, and are guided to the outer chamber through the communication passage formed in the sleeve.

  At this time, since the outer chamber is separated from the inner chamber by the sleeve, the outer chamber is hardly affected by the stirring of the inner chamber and is almost stationary. Accordingly, the water particles that have entered the outer chamber move downward due to the difference in specific gravity with the oil, and the oil and water are separated vertically in the outer chamber.

  Then, when the amount of infiltrated water reaches a predetermined level or more, the insulation resistance between the oil case and the wiring electrode is lowered, and a leakage current is detected to notify the maintenance time.

Japanese Utility Model Publication No. 57-43115

  However, according to the inundation detection device disclosed in the above-mentioned patent document, the water in the inner chamber moves to the outer chamber by the stirring action during operation of the submersible pump, but the water that has moved to the outer chamber forms in the sleeve when the submersible pump is stopped. Since the interface between the oil and water is different between when the submersible pump is in operation and when it is stopped, there is an error in the amount of water detected and the operation and stop are irregular. There is a problem that it is not suitable for a usage mode of a submersible rotating device such as a submersible pump.

  Then, in view of such a problem, the present invention is to provide an inundation detection device in an underwater rotating device that can stably detect the amount of inundation, not only during operation or when stopped.

  The technical means for solving the above-described problem is that a mechanical seal is disposed between an oil chamber provided in the underwater rotating device and a rotating shaft disposed so as to penetrate the oil chamber. In an inundation detection device in an underwater rotating device equipped with an inundation detector for detecting water intruding into the oil chamber, the oil chamber is placed under the oil chamber in an upper stirring area and a lower difficult stirring area. A partition wall for partitioning is provided, and a communication hole is formed in the partition wall for communicating the upper stirred region and the lower difficult stirring region, and the inundation detector is provided in the lower difficult stirring region. In the point.

  Moreover, it is good also as a structure where the said partition wall is provided in the lower side rather than the position of the coil spring with which the said mechanical seal was equipped.

  Further, the partition wall is provided at a lower side of a coil spring provided in the mechanical seal, and a structure in which a hanging peripheral wall portion extending downward is provided at an inner peripheral edge portion of the partition wall. Also good.

  Moreover, it is good also as a structure by which the said difficulty stirring area | region below the said partition wall is equipped with several inundation detectors spaced apart in the height direction.

  Furthermore, the said water immersion detector is good also as a structure used as the electrode-type water immersion detector provided with the electrode which detects the electrical conductivity change of the oil accommodated in the said oil chamber by a leakage current.

  According to the inundation detecting device in the underwater rotating device according to claim 1, a partition wall that partitions the oil chamber into an upper stirred region and a lower difficult stirring region is provided at a lower portion of the oil chamber, The partition wall is formed with a communication hole that communicates the upper stirring area and the lower difficult stirring area, and the lower difficult stirring area is provided with a water immersion detector. The water that has entered the oil chamber diffuses into the oil that is being stirred, but if the oil flows into the lower hard-to-stir area where it is difficult to stir through the communication hole, the flow in that area will be slow, so the difference in specific gravity Water separates downward from the oil. Accordingly, it is possible to effectively detect the flooding by the flooding detector. In addition, at the time of stoppage, there is no oil agitation, so moisture is separated due to the difference in specific gravity and accumulated in the difficult to agitate area on the lower side. Similarly, infiltration can be detected effectively by the infiltration detector. . Therefore, it is possible to stably detect the amount of water immersion not only during operation or when stopped.

  According to the inundation detecting device for the underwater rotating device according to claim 2, in the inundation detecting device for the underwater rotating device according to claim 1, the partition wall is lower than the position of the coil spring provided in the mechanical seal. If the structure is located on the side, the agitation region below the partition wall is not affected by the agitation associated with the rotation of the coil spring. The function of separating water from moisture can be more effectively exhibited.

  Further, according to the inundation detection device for the underwater rotating device according to claim 3, in the inundation detection device for the underwater rotating device according to claim 1, the partition wall is located on a lower side of the coil spring provided in the mechanical seal. In the hard-to-stirred region below the partition wall, the inner peripheral edge of the partition wall is provided at a position and is provided with a hanging peripheral wall extending downward on the inner peripheral edge of the partition wall. The drooping peripheral wall portion provided in is less susceptible to stirring due to the rotation of the coil spring, can more effectively prevent stirring in the difficult stirring region, and can more effectively exhibit the function of separating oil and moisture.

  Moreover, according to the inundation detection apparatus in the underwater rotating apparatus according to claim 4, in the inundation detection apparatus in the underwater rotating apparatus according to any one of claims 1 to 3, in the difficult stirring region below the partition wall. If the structure is provided with a plurality of inundation detectors separated in the height direction, there is an advantage that detection according to the amount of inundation is possible and the usability is excellent.

  Furthermore, according to the inundation detecting device for the underwater rotating device according to claim 5, in the inundation detecting device for the underwater rotating device according to any one of claims 1 to 4, the inundation detector is accommodated in the oil chamber. If it is set as the electrode-type water immersion detector provided with the electrode which detects the electrical conductivity change of the made oil with a leakage current, there exists an advantage which can be provided cheaply.

  Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 and 2, reference numeral 1 denotes a submersible pump as an example of a submersible rotating device installed in a sewage treatment tank. A pump unit 2 is provided, and a motor unit 3 having a rotor and a stator for driving the pump unit 2 is provided above the pump unit 2.

  Further, a drive shaft 3a as a rotation shaft of the motor unit 3 is supported so as to be rotatable about a vertical axis, that is, an axis in the vertical direction via a bearing, and between the pump unit 2 and the motor unit 3. The oil chamber 4 provided is formed in a penetrating manner so as to protrude into the pump casing 2a in the lower pump portion 2.

  An impeller 6 is detachably attached to a lower end portion of the drive shaft 3a protruding into the pump casing 2a. Further, a suction port portion 7 is provided below the impeller 6 in the pump casing 2a, and a discharge port portion 8 is provided on a side portion of the pump casing 2a.

  And the motor casing 3b in the motor part 3, the oil chamber casing 4a of the oil chamber 4, and the pump casing 2a are comprised in this embodiment from electrically conductive materials, for example, metal materials, such as cast iron.

  A mechanical seal 10 is mounted to seal between the drive shaft 3a of the oil chamber 4 through which the drive shaft 3a passes and the upper and lower portions of the oil chamber casing 4a. A desired amount of lubricating oil 11 is contained.

  The mechanical seal 10 includes an upper mating ring 10a and a lower mating ring 10b mounted on the upper and lower portions of the oil chamber casing 4a via gaskets, and an upper seal ring 10c and a lower seal ring 10d mounted on the drive shaft 3a. And a coil spring 10e that is mounted between the upper seal ring 10c and the lower seal ring 10d and presses and urges the seal rings 10c and 10d against the upper mating ring 10a and the lower mating ring 10b, respectively. When the drive shaft 3a rotates, the upper mating ring 10a and the upper seal ring 10c, and the lower mating ring 10b and the lower seal ring 10d rotate relative to each other while sliding under the elastic biasing force of the coil spring 10e. It is configured as follows. For example, as disclosed in JP-A-2004-205010.

  Moreover, in this embodiment, the bottom center part of the oil chamber casing 4a to which the lower mating ring 10b is mounted is bulged upward, and the outer peripheral part is formed in a circumferential annular groove shape. .

  At the lower part of the oil chamber 4, that is, at the height position where the lower mating ring 10b is mounted, a substantially disc-shaped partition wall 12 for partitioning the interior of the oil chamber 4 up and down is provided. The region is divided into a region 4b and a lower difficult stirring region 4c. For example, the partition wall 12 may be configured to be detachably fixed to the mounting boss 4d protruding from the bottom by bolting or the like, as indicated by a virtual line in FIG. Here, the partition wall 12 has a structure provided below the height position of the coil spring 10e.

  The partition wall 12 is formed with an appropriate number of communication holes 12a having an opening area of an appropriate size for communicating the upper stirring area 4b and the lower difficult stirring area 4c.

  An electrode-type water immersion detector 14 provided with an electrode is arranged to constitute one electrode as a water immersion detector at a desired height in the lower difficult stirring region 4c, and the oil chamber casing. 4a is the other earth electrode, and an inundation detecting device is configured to detect the amount of infiltration that has entered the oil 11 by detecting a leakage current flowing between the electrode-type infiltration detector 14 and the oil chamber casing 4a. . In addition, what is necessary is just to employ | adopt suitably the conventional structure as disclosed in patent document 1 etc. for the fall of the insulation resistance of the oil 11 by water immersion, ie, the circuit structure for detecting the leakage current by a conductive change.

  This embodiment is configured as described above. When the water depth in the sewage treatment tank reaches the starting water level of the submersible pump 1, the submersible pump 1 is driven, and the drive shaft 3 a is rotationally driven by the driving of the submersible pump 1. Then, the impeller 6 is driven to rotate, and water in the sewage treatment tank sucked from the suction port 7 is drained from the discharge port 8 through a discharge pipe (not shown).

  Further, the oil 11 is agitated in the oil chamber 4 with the rotation of the drive shaft 3a. The agitation of the oil 11 includes not only the agitation effect due to the rotation of the drive shaft 3a but also the agitation effect due to the rotation of the coil spring 10e accompanying the rotation of the drive shaft 3a. In particular, the agitation effect due to the coil spring 10e is a spiral structure. Therefore, the stirring effect seems to be greater than the stirring action by the drive shaft 3a.

  When water enters the oil chamber 4 from the mechanical seal 10 portion, it diffuses into the oil 11 as the oil 11 is agitated, causing the oil 11 to become cloudy. At this time, the oil chamber 4 is partitioned by the partition wall 12 into an upper stirring area 4 b and a lower difficult stirring area 4 c, and the stirring area 4 b is positioned on the outer periphery of the mechanical seal 10. On the other hand, the hard stirring region 4c has a structure provided below the position of the mechanical seal 10, and the hard stirring region 4c has a stirring action by the rotation of the drive shaft 3a or the mechanical seal 10. It is placed in a position that is difficult to receive.

  Therefore, when the oil 11 that has been agitated by the agitating action in the stirred region 4b and flows into the lower difficult stirring region 4c through the communication hole 12a, there is almost no flow in the difficult stirring region 4c or it becomes cloudy. Water is separated from the oil 11 and stored due to the difference in specific gravity. In the difficult stirring region 4c from which the water has been separated, the water concentration is sufficiently high, so that the water leakage can be detected more reliably by detecting the leakage current by the electrode-type water immersion detector 14. At this time, in the agitated region 4b, there is no problem even if the oil 11 is in a cloudy state, and it is possible to effectively detect the water immersion even if the total water immersion amount is small.

  In addition, when the submersible pump 1 is stopped when the water depth in the sewage treatment tank is lowered to the stop water level or when the start water level is not reached, the oil 11 is not stirred, so that the water is separated due to the difference in specific gravity. In the same manner, the water stays in the difficult stirring region 4c on the side and does not move to the stirred region 4b side, and can be effectively detected by the electrode-type water immersion detector 14. Therefore, it is possible to stably detect the amount of water immersion not only during operation or when stopped.

  Furthermore, since the electrode-type water immersion detector 14 that detects a leakage current with an electrode is used as the water immersion detector, there is an advantage that it can be provided at low cost.

  And if the attachment height position of the electrode-type infiltration detector 14 and the attachment height position of the partition wall 12 are appropriately changed, there is an advantage that the amount of inundation at the time of detecting infiltration can be freely set.

  In FIG. 2, P indicates the liquid level of the oil 11, and Q indicates the interface of water separated from the oil 11.

  4 to 6 show a second embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the first embodiment, the structure is shown applied to the submersible pump 1 in which the drive shaft 3a is driven to rotate about the vertical axis. However, in this embodiment, the rotary shaft is driven to rotate about the horizontal axis. It is set as the structure applied to the agitator 21 made.

  The stirrer 21 is installed in water such as a pond or a lake, and includes a motor unit 23 having a rotor and a stator, and an oil chamber 24 provided on one side of the motor unit 23. The drive shaft 23a is supported so as to be rotatable about a horizontal axis, that is, a horizontal axis through a bearing. The drive shaft 23a is disposed in a protruding manner on one side of the oil chamber 24 with the oil chamber 24 penetrating. A stirring blade 25 is detachably attached to the protruding end of the drive shaft 23a.

  And the motor casing 23b in the motor part 23 and the oil chamber casing 24a of the oil chamber 24 are comprised in this embodiment from electrically conductive materials, for example, metal materials, such as cast iron.

  In the same manner as described above, the oil chamber 24 is attached to both side walls of the oil chamber casing 24a in order to seal the space between the drive shaft 23a through which the drive shaft 23a penetrates and the side walls of the oil chamber casing 24a. The sealing rings 10c and 10d mounted on the mating rings 10a and 10b and the drive shaft 23a, and the seal rings 10c and 10d are mounted on the drive shaft 23a and positioned between the seal rings 10c and 10d. A mechanical seal 10 including a coil spring 10e that presses and biases the ting rings 10a and 10b is mounted, and a desired amount of lubricating oil 11 is accommodated in the oil chamber 24.

  A flat partition wall 27 is provided below the oil chamber 24, that is, below the drive shaft 23 a and the mechanical seal 10. The plate-shaped partition wall 27 that partitions the interior of the oil chamber 24 up and down is provided. And the lower difficult stirring region 24c. For example, the partition wall 12 may be configured to be detachably fixed to the mounting boss portion 24d projecting from the bottom, a mounting seat, or the like by bolting or the like, as indicated by a virtual line in FIG.

  The partition wall 27 is formed with an appropriate number of communication holes 27a each having an opening area of an appropriate size for communicating the upper stirred region 24b and the lower difficult stirring region 24c.

  And it is set as the structure where the lower side difficult stirring area 24c was equipped with the several electrode-type water immersion detector 29 of the said same structure spaced apart in the height direction. In addition, the oil chamber casing 24a is the other ground electrode, and the inundation detection detects the amount of infiltration that has entered the oil 11 by detecting the leakage current flowing between each electrode-type infiltration detector 29 and the oil chamber casing 24a. The device is configured.

  The present embodiment is configured as described above. When the stirrer 21 is driven during periodic or irregular stirring such as in a pond or a lake, the drive shaft 23a is driven to rotate, and the drive shaft 23a is rotated. When driven, the oil 11 in the oil chamber 24 is agitated as in the first embodiment. When water enters the oil chamber 24 from the mechanical seal 10 portion, it diffuses into the oil 11 as the oil 11 is agitated, causing the oil 11 to become cloudy. At this time, the oil chamber 24 is partitioned by the partition wall 27 into the upper stirred region 24 b and the lower difficult stirring region 24 c, and the oil 11 is stirred in the stirred region 24 b above the partition wall 27. .

  Then, when the oil 11 that has been agitated by the agitating action in the agitated region 24b and flows into the lower difficult agitation region 24c through the communication hole 27a, there is little or no flow in the difficult agitation region 24c, so Water is separated from the oil 11 and stored due to the difference in specific gravity. In the difficult stirring region 24c from which the water has been separated, the water concentration is sufficiently high, so that the water leakage can be detected more reliably by detecting the leakage current by the electrode type water immersion detector 29. At this time, in the agitated region 24b, there is no problem even if the oil 11 is in a cloudy state, and it is possible to effectively detect the water immersion even if the total water immersion amount is small.

  Further, when the stirrer 21 is stopped, since the oil 11 is not stirred, the water is separated due to the difference in specific gravity and remains in the lower difficult stirring region 24c. The inundation detector 29 can effectively detect inundation. Therefore, it is possible to stably detect the amount of water immersion not only during operation or when stopped.

  Furthermore, if a structure is provided with a plurality of electrode-type inundation detectors 29 at different height positions, detection according to the amount of inundation can be made in accordance with the inundation amount. It is possible to cope with the amount of flooding, and there is an advantage that it is easy to use.

  Moreover, since the electrode-type water immersion detector 29 is used as the water immersion detector, there is an advantage that it can be provided at low cost.

  FIG. 7 shows a third embodiment, and the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the first embodiment, the partition wall 12 is arranged to be positioned below the coil spring 10e in the mechanical seal 10, but in this embodiment, the partition wall 12 is formed of the coil spring 10e. It is set as the structure provided corresponding to the height position of the lower part side. The inner peripheral edge of the partition wall 12 is provided with a downward peripheral wall 12b extending in a bent shape so as to partition the central coil spring 10e side from the difficult stirring region 4c. .

  Therefore, in this embodiment, the influence of the agitation accompanying the rotation of the coil spring 10e and the like on the difficult agitation region 4c below the partition wall 12 is regulated by the hanging peripheral wall portion 12b provided at the inner peripheral edge of the partition wall 12. Here, the hard-to-stir zone 4c is hardly affected by stirring due to the rotation of the coil spring 10e and the like, and similarly to the first embodiment, stirring in the hard-to-stir zone 4c can be effectively prevented. Has the same effect as.

  In addition, in each said embodiment, although the structure using the electrode-type water immersion detectors 14 and 29 is shown as a water immersion detector, the capacitance type water immersion detector which detects the change of an electrostatic capacitance may be sufficient. The electrode-type water immersion detectors 14 and 29 are not limited at all.

  Moreover, what is necessary is just to determine suitably the magnitude | size and number of each communicating hole 12a, 27a in the partition walls 12 and 27 as needed.

  Furthermore, although the structure applied to the submersible pump 1 and the stirrer 21 is shown, it is applicable not only to the submersible pump 1 and the stirrer 21 but also to other submersible rotating devices.

It is a partial cross section front view of the submersible pump concerning a 1st embodiment of the present invention. It is the principal part enlarged view. It is the III-III sectional view taken on the line of FIG. It is a partial cross section front view of the stirrer concerning 2nd Embodiment. FIG. 5 is a cross-sectional view taken along line VV in FIG. 4. FIG. 6 is a cross-sectional view taken along line VI-VI in FIG. 5. It is principal part sectional drawing of the submersible pump concerning 3rd Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submersible pump 2 Pump part 3 Motor part 4 Oil chamber 4a Oil chamber casing 4b Stirred area | region 4c Difficult agitation area | region 10 Mechanical seal 10e Coil spring 11 Oil 12 Partition wall 12a Communication hole 12b Falling peripheral wall part 14 Electrode-type water immersion detector 21 Stirrer DESCRIPTION OF SYMBOLS 23 Motor part 24 Oil chamber 24a Oil chamber casing 24b Stirring area | region 24c Difficult stirring area 27 Partition wall 27a Communication hole 29 Electrode type water immersion detector

Claims (5)

A mechanical seal is disposed between an oil chamber provided in the underwater rotating device and a rotating shaft disposed so as to penetrate the oil chamber, and a water intrusion detector for detecting water that has entered the oil chamber. In the inundation detection device in the underwater rotating equipment equipped with
A partition wall that divides the oil chamber into an upper stirred region and a lower difficult stirring region is provided at a lower portion of the oil chamber, and an upper stirred region and a lower difficult stirring region are provided on the partition wall. A submergence detecting device in an underwater rotating device, wherein a communication hole is formed, and the submergence detector is provided in a lower difficult stirring region. In the inundation detection apparatus in the underwater rotating device according to claim 1,
The inundation detecting device in an underwater rotating device, wherein the partition wall is provided below a position of a coil spring provided in the mechanical seal. In the inundation detection apparatus in the underwater rotating device according to claim 1,
The partition wall is provided at a lower side of a coil spring provided in the mechanical seal, and a hanging peripheral wall portion extending downward to an inner peripheral edge portion of the partition wall is provided. Inundation detection device for underwater rotating equipment. In the inundation detection apparatus in the underwater rotating device according to any one of claims 1 to 3,
An inundation detecting device for an underwater rotating device, wherein a plurality of inundation detectors are provided in the difficult stirring region below the partition wall and separated in a height direction. In the inundation detection apparatus in the underwater rotating device according to any one of claims 1 to 4,
The inundation detector in an underwater rotating device, wherein the inundation detector is an electrode-type infiltration detector having an electrode for detecting a change in conductivity of oil stored in the oil chamber by a leakage current.

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