JP2015076376A - Multi-point water level detection float, and automatic operation type submerged pump using the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an automatic operation type submerged pump capable of detecting a plurality of water levels by one float switch without providing a plurality of float switches.SOLUTION: In an automatic operation type submerged pump using a motor 3 as a prime mover, a magnetic body 11 configured to be movable to the inside of a straight-shaped tube 10 having a projection part 13 therein is encapsulated in one float 6 moored to the automatic operation type submerged pump so that a floating inclined attitude is changed with increase and decrease of a liquid level. First and second lead switches 9A and 9B are attached at both ends of the tube 10. The motor 3 is activated at an operation water level h3, is stopped at a stop water level h2, and deals with an operation at emergency at an abnormal water level h5, depending on a detection signal corresponding to respective water levels obtained by making the magnetic body 11 approach or be separated from the first and second lead switches 9A and 9B, with change in the floating inclined attitude of the float 6.

Description

  The present invention relates to an automatically operated submersible pump in which a motor level is detected by a change in the attitude of a float switch that accompanies a change in the water level, whereby the motor is started and stopped.

  The three float switches corresponding to the abnormal water level, operating water level (upper limit water level), and stop water level (lower limit water level) are tethered to the outside of the pump, and the water level in the tank is detected by the posture change of the three float switches, and the pump device An automatic operation submersible pump configured to be switched between starting and stopping is known (for example, see Patent Document 1).

  The reed switch built in the float switch is built in a straight tube (sliding guide shaft), and the inclination of the tube changes due to fluctuations in the water level. The structure of a float switch of an automatically operated submersible pump that detects the water level by closing or opening the contact of the reed switch by the magnetizing action of the sliding annular magnet is known (see, for example, Patent Document 2). .)

JP 2003-269359 A JP 2006-244751 A

  However, the automatic operation submersible pump configured as in Patent Document 1 requires a plurality of float switches according to the water level, which increases the cost and complicates the structure of the pump due to the wiring of the float switch. In addition, since the float switches are entangled with each other or the floats interfere with each other, there is a problem that the position adjustment of each float switch is difficult.

  In addition, the reed switch built in the float switch as in Patent Document 2 is built in a straight pipe body (sliding guide shaft), and the inclination posture of the pipe body changes due to fluctuations in the water level. In the configuration in which the contact of the reed switch is closed or opened depending on the presence or absence of the magnetizing action of the annular magnet that slides on the outer periphery of the tubular body, in order to temporarily hold the annular magnet at an intermediate position of the tubular body When a protrusion is provided on the outer periphery of the tube body, the annular magnet must have a large inner diameter in order to securely switch over the protrusion while sliding. Since the inclination posture of the annular magnet is unstable, there is a problem that the magnetization action of the annular magnet cannot be applied to the reed switch stably and effectively.

  Therefore, the present invention is a single float switch equipped with a simple straight pipe body equipped with a reed switch without providing a plurality of float switches, giving a stable magnetization action to the reed switch, abnormal water level, operating water level, An object of the present invention is to provide an automatically operated submersible pump configured to detect three water levels of a stop water level.

  In the automatic operation type submersible pump according to the first aspect of the present invention, in the automatic operation type submersible pump using the motor as a prime mover, the automatic operation type submersible pump is tethered to the automatic operation type submersible pump so that the floating inclination posture changes as the liquid level increases or decreases. In one float, a straight tube having a protrusion is provided, and a movable magnetic material is sealed in the tube, and the first and second ends are disposed at both ends of the tube. The magnetic body enclosed in the tubular body is attached to the end of the tubular body on the hanging lower end side by hanging one or the other of the tubular body ends. By approaching the second reed switch, the reed switch is magnetized and the contact is closed, and as the liquid level increases, the tube end on the drooping end side tilts upward, and the magnetic body moves, The first and second leads are temporarily held and held by the protrusion. Since the magnetization of both switches is released and the contact opens, and the liquid level increases further, the magnetic body overcomes the protrusion and closes the contact close to the other reed switch on the hanging end side, The most important feature is that the motor is started or stopped in accordance with the detection signal of the first or second reed switch corresponding to each water level accompanying the change in the floating inclination posture of the float. To do.

  The automatic operation submersible pump according to claim 2 according to the present invention is the automatic operation submersible pump according to claim 1, wherein the distance from the wall surface of the tubular body in contact with the magnetic material to the center of gravity of the magnetic material is The height from the inner wall surface of the tubular body where the projection is installed to the top end of the projection is configured.

  The automatic operation submersible pump according to claim 3 according to the present invention is the automatic operation submersible pump according to any one of claims 1 or 2, wherein the top end of the protrusion and the inner wall surface of the tubular body are provided. The opposing space distance is configured to be larger than the total height of the magnetic body.

  The automatic operation submersible pump according to claim 4 according to the present invention is the automatic operation submersible pump according to any one of claims 1 to 3, wherein the magnetic body is formed of a sphere.

  The automatic operation type submersible pump according to claim 5 according to the present invention is the automatic operation type submersible pump according to any one of claims 1 to 4, wherein a vertical cross-sectional shape of the protrusion is a triangle, a rectangle, or a trapezoid. It is composed of any one of semicircular shapes.

  The automatic operation type submersible pump according to claim 6 according to the present invention is the automatic operation type submersible pump according to any one of claims 1 to 5, wherein the protrusion is formed by bending a part of the tubular body. It is integrally formed.

  The automatic operation submersible pump according to claim 7 according to the present invention is the automatic operation submersible pump according to any one of claims 1 to 6, wherein a cross-sectional shape of the protrusion is a crescent, rectangular, or half-moon shape. Consists of either.

  According to the self-operated submersible pump of the present invention, a straight tube body having a protruding portion inside is provided in one float tethered to the outside of the pump so that the floating inclination posture changes as the water level increases or decreases. A magnetic body movable in the tubular body is enclosed, and first and second reed switches are provided at both ends of the tubular body, and the magnetic body has the straight shape as the floating inclination of the float changes. The distance (height) from the inner wall surface of the tubular body in contact with the magnetic body to the position of the center of gravity of the magnetic body is determined by the inside of the tubular body of the protrusion. Since the height is slightly higher than the height from the wall surface to the top of the protrusion, the change in the floating inclination of the float accompanying the increase in the water level makes the tube steep and the magnetic material moves through the tube. Is securely held once by the protrusion. By further increasing the water level from the locked holding state, the inclination of the pipe body becomes steeper and the posture changes in the vertical direction, and the magnetic body moves so that the center of gravity of the magnetic body exceeds the limit of the top of the protrusion. Therefore, the magnetic body is configured to smoothly get over the protrusions, and gives stable magnetization to the first and second reed switches without causing the tilting posture of the magnetic body to become unstable during sliding. Therefore, the magnetic body is temporarily held by the protrusions, the water level at which the contacts of both the first and second reed switches are opened is the operating water level, and the magnetic body is the first or second reed switch. Simple straight shape with two reed switches because it detects the water level close to either one and the contact point of either the first or second reed switch as the abnormal water level or the stop water level Abnormal water level in one of the float switch to interior of the tubular body, driving the water level can be configured such that it is possible to reliably perform the detection of the three-point stop level.

  The protrusion has a configuration in which one side of the protrusion is brought close to a right angle in another form except for a rectangular shape in the vertical cross section, so that the magnetic body can be more securely held once. .

  Furthermore, by providing a plurality of the projecting portions, the magnetic body can be temporarily locked and held by the projecting portions more reliably than in the case of one projecting portion.

It is a mimetic diagram showing one embodiment of the automatic operation type submersible pump concerning the present invention. It is a timing chart which shows the change of the water level in a tank about operation | movement of the automatic operation type submersible pump shown in FIG. It is a longitudinal cross-sectional view which shows the state of the float switch in each water level of Example 1, (A) shows the state of the stop water level h2, (B) shows the state of the operating water level h3, (C) shows the abnormal water level h5. Shows the state. FIG. 4 is an enlarged vertical cross-sectional view of a main part for explaining a state in which a magnetic body is held and held by a protrusion in FIG. 3B and a state in which the magnetic body gets over the protrusion. It is a principal part expanded longitudinal cross-sectional view which shows the modification which made the cross section of the projection part of FIG. 4 the rectangle. It is a principal part expanded longitudinal cross-sectional view which shows the modification which made the cross section of the projection part of FIG. 4 trapezoid. FIG. 5 is an enlarged vertical sectional view of a main part showing a modification in which a cross section of a protrusion in FIG. 4 is curved and deformed into a semicircular shape. FIG. 5 is an enlarged longitudinal sectional view of a main part showing a modification in which a protrusion of FIG. 4 has a triangular cross section and a plurality of protrusions having different sizes are arranged side by side. FIG. 5 is an enlarged vertical cross-sectional view of a main part showing a modified example in which the cross-sectional shape of the protrusion in FIG. It is the cross-sectional view which formed the protrusion part side surface form in the AA line of FIG. 4 in the shape of a crescent. It is the cross-sectional view which formed the protrusion part side surface form in the AA line of FIG. 4 in the rectangle. It is the cross-sectional view which formed the protrusion part side surface form in the AA line of FIG. 4 in the half-moon shape.

  Embodiments of an automatically operated submersible pump according to the present invention will be described below in detail with reference to the drawings. Note that the present invention is not limited to the embodiment.

  As shown in FIG. 1, the automatic operation submersible pump of the main pump A of the present invention is tethered to the outside of the pump casing 1 and the automatic operation submersible pump, and the floating inclination posture changes as the water level increases and decreases. One float switch 2a that detects the water level, a motor 3 that is located above the pump casing 1 and rotates the impeller, and a control unit 4 that controls the operation of the motor 3 in accordance with a detection signal from the float switch 2a, The head cover 5 accommodates the control unit 4.

  And the automatic operation type submersible pump of the main pump A of the present invention generally uses a separate sub pump B for the automatic alternate operation, and the water in the liquid tank is alternately operated by the main pump A and the sub pump B. In this embodiment, the main pump A is set to switch between the operation mode and the stop mode every time it is operated once so that the main pump A starts operation at a rate of once every two times.

  The main pump A includes one float switch 2a, the sub pump B includes two float switches 2b and 2c, and the float switch 2a of the main pump A includes the abnormal water level h5 and the operating water level h3 of the main pump A. The stop water level h2 is detected, the float switch 2b of the sub pump B detects the operating water level h4 of the sub pump B, and the float switch 2c is configured to detect the stop water level h1 of the sub pump B. As for the positional relationship of the water levels, the stop water level h2 of the main pump A is set to a position higher than the stop water level h1 of the sub pump B, and the operation water level h4 of the sub pump B is higher than the operation water level h3 of the main pump A. In addition, the abnormal water level h5 is set to a position higher than the operating water level h4 of the sub pump B.

  In the arrangement relationship of the detected water levels of the float switches 2a, 2b, and 2c, the operation mode of the operation of the main pump A and the sub pump B during normal inflow into the tank will be described with reference to FIGS. 1 and 2. When the pump A is in the operation mode, the water level gradually increases, the water level increases in the order of the stop water level h1 of the sub pump B and the stop water level h2 of the main pump A, and when the main pump A reaches the operating water level h3 of the main pump A, It starts (P1), starts to drain, drops from the operating water level h3 of the main pump A, falls below the stop water level h2 of the main pump A, and stops the main pump A (P2) and the stop mode Wait at.

  Then, the water level gradually increases and reaches the operating water level h3 of the main pump A. Since the main pump A is in the stop mode, the main pump A continues to be stopped without being started (P3). When the water level further rises and reaches the operating water level h4 of the sub pump B, the sub pump B is activated (P4), the water level is lowered by the start of drainage, and the water level sequentially does not reach the abnormal water level h5. The main pump A is switched to the operation mode and waits while continuing the stop state by further lowering from the operation water level h3 of the main pump A and lowering the stop water level h2 of the main pump A. The sub pump B stops when it falls below the stop water level h1 of the pump B (P5).

  When the water level gradually increases again and reaches the operating water level h3 of the main pump A, the main pump A waiting for the operation mode is started (P6), and the drainage is started to decrease from the operating water level h3 of the main pump A. The main pump A stops when it falls below the stop water level h2 of the main pump A (P2) and waits in the stop mode. As described above, the main pump A and the sub pump B are automatically operated and stopped alternately. The alternate operation is repeated.

  Next, in the case of abnormal inflow into the tank, when the main pump A stands by in the stop mode, the water level in the liquid tank gradually increases, and the stop water level h1 of the sub pump B and the stop water level h2 of the main pump A are increased. The water level increases in sequence and reaches the operating water level h3 of the main pump A, but the main pump A continues to be stopped without starting (P3), so the water level rises and reaches the operating water level h4 of the sub pump B. Then, the sub pump B is activated (P4), and drainage is started. However, when the amount of inflow into the liquid tank exceeds the amount of drainage of the sub pump B, the water level in the liquid tank will continue to rise. When the water level in the liquid tank reaches the abnormal water level h5, the main pump A is also started (P7), and drainage by both the main pump A and the sub pump B is performed, so that the water level in the liquid tank decreases. Until the stop water level h2 of main pump A falls below main pump A, Both pumps of the pump B continue to operate, and when the water level falls below the stop water level h2, the main pump A stops operating (P8) and waits in the operation mode. However, the sub pump B is operated as it is and the water level is h1. If it falls below, the operation of the sub pump B stops (P9).

  When the main pump A stands by in the operation mode, the water level in the liquid tank gradually increases, the water level increases in the order of the stop water level h1 of the sub pump B and the stop water level h2 of the main pump A, and the operation of the main pump A When the water level h3 is reached, the main pump A is activated (P1 or P6) and drainage is started. However, when the amount of inflow into the liquid tank exceeds the amount of drainage from the main pump A, the water level in the liquid tank rises. When the water level in the liquid tank reaches the operating water level h4 of the sub pump B, the sub pump B is also started (P4), and drainage by both the main pump A and the sub pump B is performed. Both the main pump A and the sub pump B continue to operate until the water level in the liquid tank decreases and falls below the stop water level h2 of the main pump A. When the water level falls below the stop water level h2, the operation of the main pump A continues. Stop (P8) and wait in stop mode , The secondary pump B is operated as it is, further water level operation of the secondary pump B below h1 is stopped (P9).

  Furthermore, even if drainage is performed by both the main pump A and the sub pump B, the water level in the liquid tank further increases, and another example when the abnormal water level h5 is reached is, for example, liquid It is also possible to perform control such as issuing an alarm that the amount of inflow into the tank is abnormal, stopping inflow into the liquid tank, and operating another pump.

  An embodiment of the float switch 2a applied to the main pump A of the present invention based on the automatic operation submersible pump configured as described above will be described below.

  3 (A) to 3 (C), the float switch 2a of the main pump A in the embodiment 1 is anchored by the inserted electric wire 8 from the electric wire insertion port 7 so that the floating inclination posture changes as the water level increases or decreases. The hollow sealed float 6, the first reed switch 9A and the second reed switch 9B whose contacts are opened and closed in accordance with the change of the floating inclination posture of the float switch 2a, both ends of the tube body 10 formed in a straight shape, For example, the tubular body 10 in which the first reed switch 9A and the second reed switch 9B are provided on the outer end surface of the stopper 12 for sealing the both end portions or the outer peripheral surfaces of the both ends of the tubular body 10, and the inside of the tubular body 10 The magnetic body 11 that is enclosed in the float switch 2a and moves in the tubular body 10 in accordance with the change of the floating inclination posture, the stopper 12 that seals both ends of the tubular body 10, and the tubular body 10 The protrusion 13 is provided with a protrusion 13 that restricts the movement of the magnetic body 11, and the protrusion 13 can be formed as a separate part from the tube 10, but can preferably be formed integrally with the tube 10. It is.

  As shown in FIG. 4, when the inclination of the float switch 2a is increased due to the increase in the water level in the tank, the magnetic body 11 is once held and held by the protrusion 13, and the inclination of the float is further tilted upward. The distance H2 from the inner wall surface of the tube body 10 to the center of gravity of the magnetic body 11 is a high distance from the inner wall surface of the tube body 10 to the top end of the protrusion portion 13 so that the protrusion 11 can smoothly and easily get over the protrusion portion 13. It is preferably configured to be slightly higher than the height H1, and the opposed spatial distance H3 from the top end of the protrusion 13 to the inner wall surface of the tubular body 10 is preferably slightly larger than the total height (diameter) φ1 of the magnetic body 11. It is configured.

  Further, the protruding portion 13 is configured to have, for example, a rectangular shape shown in FIG. 5 or a trapezoidal cross-sectional shape shown in FIG. 6, or a semicircular shape in which the tubular wall surface is curved and deformed as shown in FIG. Alternatively, as shown in FIG. 8, it is possible to arrange the upper protruding portion 13u and the lower protruding portion 13d so as to face each other in the tubular body 10, but preferably for the stop signal of the main pump A as shown in FIG. The side of the second reed switch 9B side is configured to approach a right angle, and when the magnetic body 11 moves from the second reed switch 9B side to the first reed switch 9A side, the magnetic body 11 has a protrusion 13. And when the magnetic body 11 moves from the first reed switch 9A side to the second reed switch 9B side, the magnetic body 11 moves the protruding portion 13 along the inclined surface of the protruding portion 13. Configuration to get over smoothly That.

  Furthermore, as compared with the configuration of FIG. 4, for example, as shown in FIG. 9, the first projecting portion 13 a having a different size and the second projecting portion 13 are made easier to temporarily hold and hold the magnetic body 11. It is also possible to adopt a configuration in which the protruding portions 13b are arranged side by side at an interval or shape in which the magnetic body 11 is once securely locked and held.

  Further, the cross-sectional shape of the protrusion 13 along the line AA in FIG. 4 is, for example, a substantially crescent shape shown in FIG. 10, a rectangle shown in FIG. 11, or an arc portion as shown in FIG. It is also possible to form a half-moon shape along the wall surface, and it is most desirable to adopt the substantially crescent shape of FIG. 10 in which the passage space portion of the magnetic body 11 is narrow, and these configurations are any of FIGS. 4 to 9. The present invention can also be applied to the protruding portion 13 having a shape.

  For example, the magnetic body 11 can be formed in a spherical shape or a rugby ball shape, and it is desirable that the magnetic body 11 has a spherical shape so that the tube 10 can move smoothly.

  The first reed switch 9A and the second reed switch 9B are each configured to be magnetized to close the contact, to be demagnetized and to open the contact, and at each water level of the float switch 2a in FIGS. Table 1 shows the open / close states of the contacts of the first reed switch 9A and the second reed switch 9B.

  Therefore, when the water level in the liquid tank is at the stop water level h2 of the main pump A, for example, as shown in FIG. 3 (A), the float switch 2a hangs down, and the tube body 10 is connected to the first reed switch 9A. Since the second lead switch 9B side is erected, the magnetic body 11 moves away from the first reed switch 9A due to gravity and moves closer to the second reed switch 9B. The contact of the first reed switch 9A is open (OFF), but the contact of the second reed switch 9B is closed (ON). Thus, when only the contact of the second reed switch 9B is in the closed state (ON), the float switch 2a detects that the water level in the liquid tank is the stop water level h2 of the main pump A. That.

  However, when the water level in the liquid tank gradually increases and reaches the operation water level h3 of the main pump A, for example, as shown in FIG. Since the reed switch 9B side is tilted up and the reed switch 9A side of the tube body 10 is tilted down, the magnetic body 11 moves downward due to gravity and is stopped by being temporarily held by the protrusion 13, Since the magnetic body 11 is separated from the first reed switch 9A and the second reed switch 9B, the contact of the first reed switch 9A is kept open (OFF) and the second reed switch 9B When the contact is also open (OFF), and when the contact of the first reed switch 9A and the contact of the second reed switch 9B are both open (OFF), the float switch That the water level in the liquid tank reaches the operation level h3 the switch 2a is detected, the main pump A starts, waste water is started.

  When the water level further increases and reaches the abnormal water level h5, for example, as shown in FIG. 3C, the float switch 2a changes from the state of FIG. Since the second reed switch 9B side hangs down and the first reed switch 9A side is erected, the magnetic body 11 gets over the protrusion 13 by gravity and is separated from the second reed switch 9B. Since the first lead switch 9A is moved to approach the lead switch 9A and stops at the stopper 12 on the first lead switch 9A side, the contact of the first lead switch 9A is closed (ON). When the contact of the switch 9B is kept open (OFF) and only the contact of the first reed switch 9A is closed (ON) in this way, the water level in the liquid tank is mainly changed by the float switch 2a. It reaches the abnormality level h5 is detected in amplifier, as the paragraph numbers 0021 to 0023, wherein the main pump A and the sub-pump B is properly perform emergency operation corresponding.

3 Motor 6 Float 9A First Reed Switch 9B Second Reed Switch 10 Tube 11 Magnetic Body 13 Protrusion

Claims (7)

  In a self-operated submersible pump that uses a motor as a prime mover, a straight shape with protrusions inside a single float that is tethered to the self-operated submersible pump so that the floating inclination posture changes as the liquid level increases and decreases A tubular body, a movable magnetic body is enclosed in the tubular body, first and second reed switches are provided at both ends of the tubular body, and one or the other end of the tubular body When the magnetic body enclosed in the tube is in close proximity to the first or second reed switch mounted on the tube end on the bottom end side, the reed switch is magnetized. As the liquid level increases, the tube end on the drooping end side tilts upward as the liquid level increases, so that the magnetic body moves and is temporarily held and held by the protrusions. The reed switch on both sides is demagnetized to open the contact point, and the liquid level By increasing, the magnetic body overcomes the protrusion and closes the contact close to the other reed switch on the hanging end side, so that it corresponds to each water level accompanying the change of the floating inclination posture of the float The automatic operation type submersible pump is configured to switch the start or stop of the motor in response to the detection signal of the first or second reed switch.   The distance from the inner wall surface of the tubular body in contact with the magnetic body to the center of gravity of the magnetic body is configured to be higher than the height from the inner wall surface of the tubular body where the protrusion is installed to the top end of the protrusion. The automatically operated submersible pump according to claim 1.   The automatically operated submersible pump according to claim 1 or 2, wherein a facing space distance between the top end of the protruding portion and the inner wall surface of the tubular body is larger than the total height of the magnetic body.   The automatic operation submersible pump according to any one of claims 1 to 3, wherein the magnetic body is formed of a spherical body.   The automatic operation submersible pump according to any one of claims 1 to 4, wherein a vertical cross-sectional shape of the protruding portion is formed of any one of a triangle, a rectangle, a trapezoid, and a semicircular shape.   The automatic operation submersible pump according to any one of claims 1 to 5, wherein the protrusion is integrally formed by bending a part of the pipe body.   The automatic operation type submersible pump according to any one of claims 1 to 6, wherein a cross-sectional shape of the protruding portion is a crescent moon, a rectangle, or a half moon.

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