JP2007071042A - Submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a submerged pump for effectively preventing erroneous operation by a conductive sticking object. <P>SOLUTION: A starting water level detecting electrode 11 and a guard electrode 21 are installed in an upper part of an installation rod 9 supported by a pump body 1a of the submerged pump 1 and extending in the vertical direction, and a stopping water level detecting electrode 12 and a guard electrode 22 are installed in a lower part of the installation rod 9. A motor casing part 2 is formed as a submerged electrode. The guard electrodes 21 and 22 are connected to reference electric potential in a detecting circuit of a driving control device 25, and the submerged pump 1 is controlled in driving by detecting a mutual electrically continuing state of the starting water level detecting electrode 11, the stopping water level detecting electrode 12 and the motor casing part 2 by the detecting circuit. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a submersible pump that is installed in a storage tank such as a wastewater treatment tank and drains water in the tank.

  Conventionally, as this kind of submersible pump, a lower float switch for detecting a stop water level is mounted on the outer lower part of the pump body, and an upper float for detecting the starting water level via a mounting rod on the outer upper part of the pump body. If the switch is installed and the upper float switch is activated by detecting the rising water level and the starting water level is detected, the submersible pump is activated to drain the water, and then the lower float switch is restored due to the lowering of the water level accompanying drainage. There is a structure in which the submersible pump is controlled to stop if the stop water level is detected.

  There are also submersible pumps that perform drive control by attaching a plurality of float switches such as a lower float switch and an upper float switch to a mounting rod supported by the pump body (see, for example, Patent Document 1 and Patent Document 2). .

  However, in the submersible pump of the type using such a float switch, there is a problem that the water level detection component is increased in size because the switch unit is operated by ups and downs of the float switch.

  On the other hand, there is an electrode type that includes a lower electrode for detecting a stopped water level and an upper electrode for detecting a starting water level, and drives and controls the submersible pump by detecting the conduction state of the upper electrode and the lower electrode due to fluctuations in the water level. (For example, refer to Patent Document 3).

JP 2003-286888 A JP-A-6-241191 Japanese Utility Model Publication No. 48-904

  However, according to the conventional submersible pump of the electrode type that controls the drive by detecting the conduction state of the upper electrode and the lower electrode as described above, there is an advantage that it can be configured compactly without requiring ups and downs like the float switch. However, if a conductive foreign object such as a wet cloth as a contaminant in the stored water hangs down on the upper electrode, the conductive state is established through the conductive foreign object even if the starting water level is not reached. If the submersible pump is activated and entangled with the lower electrode when it is detected, the submersible pump will not stop because the conductive state is detected through the conductive foreign object even if the water level drops below the stop water level. There was a risk of malfunctioning.

  In view of these problems, an object of the present invention is to provide a submersible pump that effectively prevents malfunction due to conductive deposits.

  The technical means for solving the above-described problem includes an underwater electrode disposed in water and a water level detection electrode disposed at a desired height position, and the mutual between the underwater electrode and the water level detection electrode. In the submersible pump that is driven and controlled by detecting the continuity state by the detection circuit, a guard electrode connected to a predetermined potential in the detection circuit is provided in the vicinity of the water level detection electrode.

  Moreover, it is good also as a structure where the said water level detection electrode and the said guard electrode are attached to the attachment rod extended in the up-down direction supported by the pump main body of a submersible pump.

  Further, an insulating clamp body is attached to the mounting rod, the water level detection electrode is provided on the inner surface of the lower surface of the clamp body, and the guard electrode is provided so as to cover the outer side of the water level detection electrode. It is good also as a structure with which the lower surface outer periphery side of the clamp body is equipped.

  In addition, a clamp body made of a high-resistance conductive resin as the guard electrode is attached to the mounting rod, and the water level detection electrode made of a low-resistance conductive resin is disposed in an embedded state on the lower surface of the clamp body. It is good also as the structure currently made.

  Furthermore, it is good also as a structure where the insulating cap body is mounted | worn so that the upper surface side of the said water level detection electrode may be covered.

  As described above, according to the submersible pump of the present invention, the guard electrode connected to the predetermined potential in the detection circuit is provided in the vicinity of the water level detection electrode, and the conduction state is detected on the water level detection electrode side. Therefore, it is possible to easily identify whether it is due to the arrival of the water level or due to conductive deposits, so that malfunction due to conductive deposits can be effectively prevented.

  Further, if the mounting rod extending in the vertical direction supported by the pump body of the submersible pump is provided with the water level detection electrode and the guard electrode, the structure becomes simple and can be easily provided.

  Further, an insulating clamp body is attached to the mounting rod, a water level detection electrode is provided on the inner surface of the lower surface of the clamp body, and the guard body is provided so that the outer side of the water level detection electrode is separated and covered. If the structure is provided on the outer peripheral side of the lower surface, contact of the conductive deposits to the water level detection electrode can be more effectively prevented by the clamp body and the guard electrode, so that malfunction can be prevented from this point.

  In addition, a clamp body made of a high-resistance conductive resin as a guard electrode is attached to the mounting rod, and a water level detection electrode made of a low-resistance conductive resin is disposed in an embedded state on the lower surface of the clamp body. If it is set as a structure, while being able to manufacture easily the clamp body provided with the water level detection electrode and the guard electrode, the contact of the conductive deposit with respect to a water level detection electrode can also be prevented effectively.

  Furthermore, if the insulating cap body is attached so as to cover the upper surface side of the water level detection electrode, the cap body can effectively prevent the conductive deposits from contacting the water level detection electrode. Prevents malfunctions.

  DESCRIPTION OF EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to the drawings. As shown in FIGS. 1 to 4, a pump body 1a in a submersible pump 1 is, for example, a metal motor casing portion that houses a motor portion. 2 and a motor cover 3 made of, for example, resin or metal that covers the upper part of the motor casing 2, and a pump casing made of, for example, resin or metal that is arranged at the lower part of the motor casing 2 and houses the impeller Part 4.

  In addition, a cylindrical suction port cover body 5 having a plurality of communication openings 5a formed on the peripheral surface is disposed below the pump casing portion 4 so as to surround the suction port of the pump casing portion 4. A drain pipe 6 is connected to the discharge part on one side of the pump casing part 4.

  Then, an attachment rod 9 made of an insulating resin pipe or the like having an appropriate length is attached and fixed to a side portion of the motor cover portion 3 in the pump body 1a with an axial center in the vertical direction. Has been. As a mounting structure using the support bracket 8, a known structure such as a structure in which the periphery of the mounting rod 9 is held and tightened loosely may be adopted as appropriate.

  And the starting water level detection electrode 11 and the stop water level detection electrode 12 as a water level detection electrode for detecting a starting water level and a stop water level are attached to the upper part and the lower part of the attachment rod 9 so that height adjustment is possible respectively in an up-down direction. It has been.

  The activation water level detection electrode 11 is formed by appropriately forming a conductive material, for example, a stainless steel plate, into a shape, and as shown in FIGS. A C-shaped holding portion 14 and fastening pieces 15 extending from both ends of the holding portion 14 so as to face each other are provided. Then, one end of the electric wire 18 is connected and fixed to the starting water level detection electrode 11 by fastening the fixing screw 16 and the connecting nut 17, and the starting water level detection electrode 11 is attached to the mounting rod by fastening the fixing screw 16 and the fastening nut 19. It is set as the structure attached and fixed to the desired height position of 9 upper part.

  The stop water level detection electrode 12 is also made of a conductive material, for example, a stainless steel plate, like the activation water level detection electrode 11, and includes a holding portion 14 and a pair of clamping pieces 15 opposed to each other. Then, one end of the electric wire 20 is connected and fixed to the stop water level detection electrode 12 by the fixing screw 16 and the connection nut 17, and the stop water level detection electrode 12 is connected to a desired height below the mounting rod 9 by the fixing screw 16 and the fastening nut 19. It is structured to be fixed in position.

  Further, in the present embodiment, guard electrodes 21 and 22 are attached to positions in the vicinity immediately below the start water level detection electrode 11 and the stop water level detection electrode 12 so that the height can be adjusted in the vertical direction. Each of the guard electrodes 21 and 22 is made of a conductive material such as a stainless steel plate, like the water level detection electrodes 11 and 12, and includes a holding portion 14 and a pair of fastening pieces 15 facing each other. Then, one ends of the electric wires 23 and 24 are connected and fixed to the guard electrodes 21 and 22 by the fixing screw 16 and the connecting nut 17, respectively, and the mounting rod 9 is brought to a desired height position by the fixing screw 16 and the fastening nut 19. The structure is fixed and fixed. The guard electrodes 21 and 22 are preferably arranged as close to the water level detection electrodes 11 and 12 as possible.

  Further, the other ends of the electric wires 18, 20, 23, 24 connected to the water level detection electrodes 11, 12, and the guard electrodes 21, 22, are built in the motor cover 3 as shown in FIG. And connected to a detection circuit 26 of a drive control device 25 for driving and controlling the submersible pump 1.

  Furthermore, the motor casing part 2 which is a metal part in the pump main body 1a is also connected to the detection circuit 26, and the motor casing part 2 is configured as an underwater electrode 27 which is located in water. The underwater electrode 27 may be separately provided outside the pump body 1a.

  For example, as shown in FIG. 6, the start water level detection electrode 11 and the stop water level detection electrode 12 are connected to a reference potential as a predetermined potential of the detection circuit 26 via a predetermined resistance R, and each guard electrode 21. , 22 are connected to the reference potential of the detection circuit 26, and the underwater electrode 27 is connected to a predetermined power source. And the water level H is made into a starting water level and a stop water level by the detection of the conduction state through the water between the starting water level detection electrode 11 and the underwater electrode 27 and between the stopping water level detection electrode 12 and the underwater electrode 27. The submersible pump 1 is driven and controlled through the pump drive circuit 28 in accordance with the determination signal.

  The present embodiment is configured as described above. When the submersible pump 1 is installed in the waste water treatment tank, the water level H in the waste water treatment tank is higher than the activation water level detection electrode 11 as shown in FIG. If it is below, the stop water level detection electrode 12 is detected to be immersed in water, but since the activation water level detection electrode 11 is not immersed in water, the detection circuit 26 of the drive control device 25 is activated. It is determined that the water level has not been reached, and the submersible pump 1 is controlled to be stopped by the pump drive circuit 28.

  Thereafter, when the water level H rises and reaches the position of the activation water level detection electrode 11 due to the inflow of water from an inflow pipe or the like, the water between the underwater electrode 27 and the activation water level detection electrode 11 passes through the water. The conduction state is detected by the detection circuit 26, and it is determined that the water level H has reached the starting water level based on the detected voltage value, and the determination signal is output to the pump drive circuit 28. The pump drive circuit 28 receives this determination signal and activates the submersible pump 1.

  When the submersible pump 1 is started, the stored water in the waste water treatment tank is sucked through each communication opening 5 a of the suction port cover body 5, and the stored water is drained outside the tank through the drain pipe 6.

  Thereafter, due to the decrease in the water level H accompanying the drainage by the submersible pump 1, the drainage continues even if the water level H falls below the position of the startup water level detection electrode 11, and finally the water level falls below the position of the stop water level detection electrode 12. When H falls, the conduction state between the underwater electrode 27 and the stop water level detection electrode 12 is cut off, and the detection of the conduction state cut by the detection circuit 26 determines that the water level H has reached the stop water level. The determination signal is output to the pump drive circuit 28. The pump drive circuit 28 receives this determination signal and stops the submersible pump 1.

  Thereafter, the water level H is stopped again until the water level H reaches the height of the startup water level detection electrode 11.

  On the other hand, in such drive control of the submersible pump 1, as shown in FIG. 6, a conductive deposit 30 as a conductive foreign matter such as a foreign substance such as a wet cloth or paper is contained in the stored water. However, when the water level H does not reach the starting water level when the conductive water deposit 30 is in contact with the water surface when the starting water level detection electrode 11 hangs down, Between the underwater electrode 27 and the starting water level detection electrode 11 via the deposit 30, a circuit-connected state is obtained and a conduction state is obtained.

  At this time, in the present embodiment, since the guard electrode 21 is disposed in the vicinity of the activation water level detection electrode 11, even between the underwater electrode 27 and the guard electrode 21 via the water and the conductive deposit 30. A conduction state is obtained. Since the resistance R is interposed on the startup water level detection electrode 11 side and the guard electrode 21 is directly connected to the reference potential, most of the current from the underwater electrode 27 flows through the guard electrode 21, and the startup water level detection electrode Almost no flow on the 11 side.

  Therefore, the detection circuit 26 does not detect the voltage value corresponding to the predetermined conduction state with respect to the activation water level detection electrode 11, determines that the water level H has not reached the activation water level, and the submersible pump 1 is not activated. Then, when the water level H rises and reaches the position of the startup water level detection electrode 11, as described above, a conduction state directly via water is obtained between the underwater electrode 27 and the startup water level detection electrode 11. The voltage value corresponding to the predetermined conduction state is detected by the detection circuit 26, and it is determined that the water level H has reached the starting water level, and the submersible pump 1 is started.

  Similarly, when the conductive deposit 30 is tangled in a hanging manner with respect to the stop water level detection electrode 12, if the water level H becomes equal to or lower than the stop water level detection electrode 12, the current from the underwater electrode 27 is almost all. It flows through the guard electrode 22 and hardly flows to the stop water level detection electrode 12 side.

  Therefore, the detection circuit 26 does not detect the voltage value corresponding to the predetermined conduction state with respect to the stop water level detection electrode 12, determines that the water level H has reached the stop water level, and stops the submersible pump 1.

  As described above, according to the present embodiment, the detection circuit detects whether the detection of the conduction state at the starting water level detection electrode 11 or the stop water level detection electrode 12 is due to the arrival of the water level H or due to the conductive deposit 30. Therefore, it is possible to effectively prevent a start error at the start water level H and a stop error at the stop water level H, and to effectively prevent malfunction of the submersible pump 1 due to the conductive deposit 30.

  Further, the mounting rod 9 that is supported by the pump body 1a of the submersible pump 1 and that extends in the vertical direction has a simple structure in which the start water level detection electrode 11, the stop water level detection electrode 12, and the guard electrodes 21 and 22 are mounted. There are benefits that can be offered.

  Further, since the so-called electrode system is used to detect the water level H with the start water level detection electrode 11 and the stop water level detection electrode 12, there is an advantage that ups and downs like a float switch are not required and a compact configuration can be achieved.

  7 to 10 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.

  In other words, in the present embodiment, the cap body 32 formed of an insulating resin is provided so as to cover the upper surface side of the start water level detection electrode 11 and the stop water level detection electrode 12 attached to the attachment rod 9. ing.

  The cap body 32 has a cylindrical fitting cylinder part 32a having an inner diameter that is the same as or slightly larger than the outer diameter of the mounting rod 9, and the fitting cylinder part 32a so as to cover the upper surface side of the water level detection electrodes 11 and 12. In order to cover the upper surface cover portion 32b that is formed so as to protrude in the shape of an ellipse radially outward from the lower end of the upper surface, and the side surface side of the water level detection electrodes 11 and 12, it extends downward from the outer peripheral edge portion of the upper surface cover portion 32b. And a side cover portion 32c.

  In addition, a pair of engaging pieces 32d are provided on the lower surface side of the upper surface cover portion 32b so as to extend downward with a predetermined distance from each other, and the cap body 32 is mounted from above the water level detection electrodes 11 and 12. In this case, both the tightening pieces 15 of the water level detection electrodes 11 and 12 are engaged from both sides, and the rotation around the axis of the mounting rod 9 is restricted. A recess 32e having an appropriate size for avoiding interference with the fixing screw 16 and the fastening nut 19 is formed in a notch shape at the lower edge of each engagement piece 32d.

  Accordingly, the cap body 32 is slid downward along the attachment rod 9 from the upper side of the water level detection electrodes 11 and 12 fixedly attached to the attachment rod 9 and attached to the upper surface side of the water level detection electrodes 11 and 12. That's fine.

  Further, in the present embodiment, the guard electrodes 21 and 22 are made of a stainless material and have a flat structure, and cylindrical mounting tube portions 21a and 22a that are externally fitted to the mounting rod 9 so as to be slidable relative to each other. The upper surface cover portion 32b and the electrode portions 21b and 22b which are formed to have substantially the same shape and the same size are provided. The mounting cylinder portions 21a and 22a are positioned and fixed to the mounting rod 9 by fixing screws or the like, and the electrode portions 21b and 22b. The one ends of the electric wires 23 and 24 are connected and fixed at appropriate positions by fixing screws or the like. Other structures are the same as those in the first embodiment.

  Therefore, in the present embodiment, the same effect as that of the first embodiment is achieved, and the upper surface side of the start water level detection electrode 11 and the stop water level detection electrode 12 is covered with the cap body 32. The cap body 32 can effectively prevent adhesion and contact of the conductive deposit 30 contained in the water level detection electrodes 11 and 12 by the cap body 32, and also from this point, malfunction of the submersible pump 1 can be effectively prevented.

  FIG. 11 and FIG. 12 show 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.

  In other words, in the present embodiment, the clamp body 34 formed of an insulating resin is detachably mounted on the mounting rod 9. The clamp body 34 is configured in a substantially C shape in plan view with the mounting rod 9 being held, and the mounting rod 9 is fastened and loosened by fastening screws 35 and nuts 36 at both ends thereof. It can be mounted and fixed at a desired height position.

  Further, the water level detection electrodes 11 and 12 made of a stainless steel material are provided in a downward projecting manner in an arc shape on the inner side of the lower surface of the clamp body 34, and the outer sides of the water level detection electrodes 11 and 12 are separated and covered. Further, guard electrodes 21 and 22 made of stainless steel in an arc shape are provided on the outer peripheral side of the lower surface of the clamp body 34 so as to protrude downward. At this time, the downward protruding length of the water level detection electrodes 11 and 12 is the same as or shorter than the downward protruding length of the outer guard electrodes 21 and 22.

  Further, on the lower surface side of the clamp body 34, electric wires 18, 20, 23, and 24 connected to the water level detection electrodes 11 and 12 and the guard electrodes 21 and 22 are provided in a drawn shape. In the present embodiment, the clamp body 34 has a structure in which the electric wires 18, 20, 23, and 24 are connected to the water level detection electrodes 11 and 12 and the guard electrodes 21 and 22, and is integrally formed of resin.

  And it is set as the structure which attaches and fixes the clamp body 34 to the upper part and lower part of the attachment rod 9, respectively corresponding to the height position of a starting water level and a stop water level. Other structures are the same as those in the first embodiment.

  Therefore, in the present embodiment, the same effect as in the first embodiment is achieved, and the upper surface side and the outer surface side of the water level detection electrodes 11 and 12 are covered with the clamp body 34 and the guard electrodes 21 and 22. Since adhesion and contact of the conductive deposit 30 to the water level detection electrodes 11 and 12 can be more effectively prevented, malfunction of the submersible pump 1 can also be effectively prevented from this point.

  Moreover, since the connection part of the water level detection electrodes 11 and 12 and the guard electrodes 21 and 22 and the electric wires 18, 20, 23, and 24 is embedded in the clamp body 34, a waterproof effect on the connection part can be exhibited. .

  FIG. 13 to FIG. 15 show a fourth embodiment, and the same components as those in the third embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the present embodiment, the water level detection electrodes 11 and 12 are embedded in the lower surface side of the clamp body 34, and the guard electrodes 21 and 22 are disposed along the outer peripheral edge of the upper surface side of the clamp body 34. The structure is made. And it is set as the structure which attaches and fixes the clamp body 34 to the upper part and lower part of the attachment rod 9, respectively corresponding to the height position of a starting water level and a stop water level. Other structures are the same as those in the third embodiment. In this embodiment, a two-core electric wire is used as the electric wires 18, 20, 23, 24 connected to the water level detection electrodes 11, 12 and the guard electrodes 21, 22.

  Therefore, the present embodiment has the same effect as the third embodiment.

  16 to 18 show a fifth embodiment, and the same components as those in the fourth embodiment are denoted by the same reference numerals, and the description thereof is omitted.

  That is, in the present embodiment, the clamp body 34 is formed of a high-resistance conductive resin, and the clamp body 34 itself functions as the guard electrodes 21 and 22. And it is set as the structure by which the water level detection electrodes 11 and 12 formed with the low resistance conductive resin were arrange | positioned at the lower surface side of the clamp body 34 by the embedding form. Other structures are the same as those in the fourth embodiment.

  Therefore, in this embodiment, the same effect as that of the fourth embodiment is obtained, and the water level detection electrodes 11 and 12 and the guard electrodes 21 and 22 have a structure formed of a conductive resin. Although inferior to other embodiments, there is an advantage that it can be easily produced by adjusting the amount of conductive material such as carbon black.

  In addition, the shape etc. of the water level detection electrodes 11 and 12 and the guard electrodes 21 and 22 in each said embodiment are not limited at all, What is necessary is just to comprise in a shape etc. suitably.

  Moreover, in each said embodiment, although the structure which attached the water level detection electrodes 11 and 12 and the guard electrodes 21 and 22 to the two upper and lower positions of the attachment rod 9 is shown, 3 separated in the up-down direction of the attachment rod 9 is shown. It is good also as a structure which attaches them to a location. Two submersible pumps with water level detection electrodes and guard electrodes attached at two locations and two submersible pumps with water level detection electrodes and guard electrodes attached at three locations are installed in the wastewater treatment tank. It is also possible to control the drive so that it is operated.

  Furthermore, although the structure which attaches the starting water level detection electrode 11, the stop water level detection electrode 12, and each guard electrode 21 and 22 to the attachment rod 9 is shown, the structure directly attached to the pump main body 1a side, etc. may be sufficient.

  Moreover, although the structure provided with the drive control apparatus 25 in the pump main body 1a is shown, it is good also as a structure installed in the control panel installed on the ground.

It is a side view which shows the submersible pump concerning the 1st Embodiment of this invention. It is the same part enlarged view. FIG. 3 is a plan view of FIG. 2. It is the IV-IV arrow line view of FIG. It is the same control block diagram. It is the same detection operation explanatory drawing. It is a principal part side view concerning 2nd Embodiment. It is a side view of the cap body. It is a bottom view of FIG. It is a bottom view of a guard electrode. It is a principal part side view concerning 3rd Embodiment. It is a bottom view of the cap body. It is a top view of the clamp body concerning a 4th embodiment. It is a side view of the cap body. It is a bottom view of the cap body. It is a top view of the clamp body concerning a 5th embodiment. It is a side view of the cap body. It is a bottom view of the cap body.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Submersible pump 1a Pump main body 2 Motor casing part 9 Mounting rod 11 Starting water level detection electrode 12 Stop water level detection electrode 21 Guard electrode 22 Guard electrode 25 Drive control device 26 Detection circuit 32 Cap body 34 Clamp body

Claims (5)

Driven by detecting the conduction state between the underwater electrode and the water level detection electrode by a detection circuit, which includes an underwater electrode located in the water and a water level detection electrode arranged at a desired height. In controlled submersible pumps,
A submersible pump, wherein a guard electrode connected to a predetermined potential in the detection circuit is provided in the vicinity of the water level detection electrode. The submersible pump according to claim 1,
A submersible pump, wherein the water level detection electrode and the guard electrode are mounted on a mounting rod extending in a vertical direction supported by a pump body of the submersible pump. The submersible pump according to claim 2,
An insulating clamp body is attached to the mounting rod, the water level detection electrode is provided on the inner side of the lower surface of the clamp body, and the guard electrode is clamped so as to cover and cover the outer side of the water level detection electrode. A submersible pump characterized by being provided on the outer peripheral side of the lower surface of the body. The submersible pump according to claim 2,
A clamp body made of a high-resistance conductive resin as the guard electrode is attached to the mounting rod, and the water level detection electrode made of a low-resistance conductive resin is disposed in an embedded state on the lower surface of the clamp body. A submersible pump characterized by In the submersible pump according to claim 1 or 2,
A submersible pump, wherein an insulating cap body is attached to cover the upper surface side of the water level detection electrode.

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