JP2006336560A - Automatic alternate operation device for submerged pump - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To facilitate assembly and wiring work, simplify a control circuit, and reduce cost of a device for operating two submerged pumps automatically and alternately. <P>SOLUTION: Two submerged pumps including the No. 1 pump P1 and the No. 2 pump P2 are alternately and automatically operated and controlled. These submerged pumps have a second float switch S2 for detecting a start water level H2 and a stop water level L2 of the No. 2 pump P2. These submerged pumps have a first float switch S1 for detecting a higher water level than the second float switch and detecting a start water level H1 and a stop water level L1 of the No. 1 pump P1. These submerged pumps have a third float switch S3 for detecting an abnormal water level H3 being a further higher water level than the first float switch. These submerged pumps have an automatic alternate operation controller for controlling alternate operation by switching operation mode and operation halt mode of the No. 2 pump P2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to an automatic alternating operation apparatus for a submersible pump that drains water using two submersible pumps.

  When drainage work is performed using a submersible pump, a system in which two submersible pumps are alternately switched and intermittently operated is generally popular in order to extend the life of the submersible pump and save energy. A typical example of this type of system is an alternating automatic operation control system for an electric pump disclosed in Japanese Patent Laid-Open No. 6-241191.

  The system disclosed in Japanese Patent Laid-Open No. 6-241191 uses an electric No. 1 pump and No. 2 pump, and a No. 1 pump stop lower limit water level detector and No. 2 pump stop that regulate the lowest water level. A lower limit water level detector, a No. 2 pump start upper limit water level detector that detects a higher water level than both of these detectors, and a No. 1 pump start upper limit water level detector that detects a higher water level than the detector, An abnormally increased water level detector that detects a higher water level than the detector, and an automatic alternating operation circuit, and the operation of the No. 2 pump by the water level detection signal of the No. 2 pump start upper limit water level detector. It was configured to control the alternate operation by switching between the mode and the operation stop mode. The five detectors are usually constituted by float switches. However, there are the following problems.

  That is, since many float switches are required for the alternate automatic operation control of the electric pump, there is a problem in that not only the assembly work and wiring work of the apparatus are required, but also the cost of the apparatus is increased. In addition, the electric wires connected to each float switch are entangled with each other, causing malfunctions, and there is a problem that the failure frequency is high such that the float switch comes into contact with the submersible pump or the tank wall and breaks. Furthermore, there is a problem that the circuit configuration for controlling many float switches is complicated.

Japanese Patent Application Laid-Open No. 6-2141191 (page 2-5, FIG. 1)

  The present invention has been developed in view of the above-mentioned conventional problems, and facilitates assembly and wiring work of a device that automatically operates two submersible pumps by reducing the number of float switches used. In addition, simplification of the control circuit can be achieved to reduce the cost of the device. In addition, malfunction due to entanglement of the wire of the float switch can be prevented, and the failure frequency of the device due to damage of the float switch can be suppressed. An object of the present invention is to provide an automatic alternating operation device for a submersible pump to be obtained.

In order to solve the above problems, the present invention employs the following means.
That is, the automatic alternating operation apparatus for submersible pumps according to the present invention is an automatic alternating operation apparatus for submersible pumps in which two submersible pumps, an electric No. 1 pump and No. 2 pump, are alternately controlled automatically. A second float switch that detects both the starting water level and the stopping water level of the No. 2 pump, and a higher water level than the second float switch, and both the starting water level and the stopping water level of the No. 1 pump. Including a first float switch capable of detecting a single float, a third float switch capable of detecting an abnormal water level higher than the first float switch, and an automatic alternating operation control circuit. The alternate operation can be controlled by switching between the operation mode and the operation suspension mode of the No. 2 pump by the start water level detection signal of the second float switch of the pump. Both the first float switch and the second float switch have the same configuration, and the sliding magnet is slid by the tilt of the float as the water level rises and falls, and the contact of the reed switch is made by the sliding. Open and close. A housing space is provided in the float while ensuring watertightness, and a sliding guide shaft that houses the reed switch is placed in the housing space, and the sliding guide shaft of the housing space is provided. The outer space portion is a sliding chamber, the sliding guide shaft is inserted into the insertion hole of the sliding magnet, and the sliding magnet is moved in the sliding chamber in the axial direction of the sliding guide by tilting the float. It can slide on. In addition, magnetic parts are provided at both ends of the sliding chamber, and when the float tilts upward, the magnetic part and the sliding magnet located above until the float tilts upward to a set angle. And become adsorbed. Then, when the attracting state is released by the action of gravity by tilting upward above the set angle, the sliding magnet moves downward along the sliding guide shaft in a direction approaching the reed switch. The starting water level can be detected by sliding and closing the contact of the reed switch. On the other hand, when the float tilts downward, the magnetic part located above and the sliding magnet are attracted to each other until the float tilts downward to a set angle. Then, when the float is tilted downward beyond the set angle and the attracted state is released by the action of gravity, the sliding magnet moves downward along the sliding guide shaft in a direction away from the reed switch. It slides in the direction, and the contact of the reed switch is opened so that the stop water level can be detected.

  In the first float switch and the second float switch, an inner peripheral edge portion of the insertion hole of the sliding magnet in an attracted state with the magnetic portion on both side portions in the length direction of the sliding guide shaft It is preferable to provide an engaging circumferential groove that is continuous in the circumferential direction, and that both end edges of the insertion hole are formed as arc-shaped protruding edges.

  In this case, the groove width of the engagement circumferential groove is set to be slightly larger than the thickness of the sliding magnet, and the magnetic part and the sliding magnet are in a state where the float is tilted upward or downward. When the attracting state of the engagement circumferential groove is temporarily released, the sliding magnet is supported at the lower end of the engagement circumferential groove, and the clearance width of the engagement circumferential groove is the magnetic It is preferable to set so that the portion and the sliding magnet can be in the attracted state again.

The present invention has the following excellent effects.
(1) The automatic alternating operation apparatus for submersible pumps according to the present invention includes a float switch in which magnetic parts are provided on both ends of a sliding guide shaft for sliding a sliding magnet, Therefore, the number of float switches used can be reduced as compared with the conventional apparatus in which the submersible pump is automatically operated alternately. As a result, it is possible to facilitate the assembly and wiring work of a device that automatically operates two submersible pumps alternately, and to achieve simplification of the control circuit, thereby reducing the cost of the device. In addition, since the number of float switches used is small, it is possible to prevent malfunctions due to entanglement of the float switch wires, and it is also possible to suppress the frequency of failure of the apparatus accompanying damage to the float switch. In addition, the failure frequency of the device due to damage to the float switch can be suppressed.

  (2) In particular, when a configuration in which engagement circumferential grooves are provided on both side portions in the length direction of the sliding guide shaft is adopted, the magnetic part and the sliding magnet are attracted by the occurrence of a sudden wave in the water tank or the like. It is preferable because it is possible to more reliably prevent a malfunction that the state is released and the contact of the reed switch is inadvertently opened and closed.

  In FIG. 1, an automatic alternating operation device (hereinafter referred to as “device”) 1 for a submersible pump according to the present invention is such that two submersible pumps, an electric No. 1 pump P1 and a No. 2 pump P2, are automatically and automatically controlled. Yes, the second float switch S2 that detects both the start water level H2 and the stop water level L2 of the No. 2 pump P2, and can detect a higher water level than the second float switch S2 and the No. 1 pump A first float switch S1 that can detect both the start water level H1 and the stop water level L1 of P1, and a third float that can detect an abnormal water level H3 that is higher than the second float switch S2. A switch S3 and an automatic alternating operation control circuit are provided, and the operation mode and the operation stop mode of the No. 2 pump P2 are switched by the start water level detection signal of the second float switch S2. It is composed as to control each other operation. In FIG. 1, a first float switch S1 and a second float switch S2 indicated by broken lines indicate a state in which the activation water level H1 and the activation water level H2 are detected, respectively, and a third float indicated by the broken line. The switch S3 indicates a state where it hangs down due to a drop in water level.

  Both the first float switch S1 and the second float switch S2 have the same configuration of contact a. This will be described in more detail with reference to FIGS. 1 and 2. The first float switch S1 and the second float switch S2 are accommodated in the float 2 due to the tilt of the float 2 accompanying the change in the water level. A sliding magnet (magnet) 6 is made slidable by being guided by a sliding guide shaft 5 housed in the space 3, and the contact 8 of the reed switch 7 is opened and closed by the sliding. Yes. Magnetic parts 9 and 10 are provided on the front and rear end sides of the sliding guide shaft 5 so as to be in an attracted state with the sliding magnet 6 until the float 2 tilts at a predetermined angle. As the magnetic parts 9 and 10, all materials having magnetism such as magnets and steel materials (those that are attracted to the magnets) can be used. In this embodiment, the magnets and holding magnets 9 a are held. A magnet 10a is used.

  The float 2 is set to have a total length of, for example, about 90 mm. As shown in FIGS. 3 to 4, the float 2 tapers toward the front end, and the front and rear ends have openings 11 and 12 (the front end opening 11 has a later-described electric wire 13. Is formed on the outer peripheral surface of the joint portion 20 (FIG. 2). The float core body 22 is provided in the rear side portion of the float body 21 that is fitted so as not to be fitted.

  The diameter of the rear float portion 17 having a hemispherical shape is set to about 62 mm, for example, and the front float portion 15 and the rear float portion 17 are made of a hard synthetic resin such as an ABS resin. The float core 22 is made of, for example, foamed polyethylene and has a bottomed cylindrical shape in which a blind insertion hole 23 with a front end opening is provided in the axial direction. A rear outer surface 25 is an inner surface 26 of the rear float portion 17. It is formed in a spherical surface that can be in close contact with.

  As shown in FIGS. 3 to 5, the housing space 3 is configured by using a resin housing cylinder 27 having a bottomed cylindrical shape with an open front end, as shown in FIGS. A concave portion 31 (FIGS. 2 and 5) is provided at the center of the front surface 30 of the front surface, and a truncated cone portion 28 is provided at the center of the rear surface 32 of the bottom portion 29 at a portion facing the concave portion 31 at the rear. Has been. Further, as shown in FIG. 5, support protrusions 33 project in the radial direction at an angular pitch of 90 degrees at the peripheral portion of the recess 31. The support protrusion 33 is formed in, for example, a triangular shape with a sharp tip. The front end portion 35 of the housing cylinder 27 is provided with a rectangular notch 36 at an angular pitch of 90 degrees, and a rectangular protrusion 37 is formed between the rectangular notches 36 and 36. Further, the bottom 29 side of the inner peripheral surface 46 of the accommodating cylinder 27 is slightly contracted through a step 34.

  The sliding guide shaft 5 is integrally formed of, for example, a resin such as polyacetal. As shown in FIGS. 3 to 4 and FIG. 6, the sliding guide shaft 5 is long in the front-rear direction and the middle portion has a maximum diameter of, for example, about 6.9 mm. While being formed as a circular intermediate shaft portion 39 having an outer diameter of an engaging projection 50 (to be described later), the rear end shaft portion 40 is tapered. A blind accommodation hole 41 opening 38 at the front end is provided so as to extend to the rear end side along the axis of the sliding guide shaft 5. The sliding guide shaft 5 having such a configuration is accommodated in the housing cylinder 27 along the axis thereof, and the rear end shaft portion 40 is fitted into the recess 31.

  In addition, a flange portion 42 that is cut in parallel with the opposite side of the disk portion is integrally provided at a portion near the front end of the sliding guide shaft 5, and the rear surface of the flange portion 42 is 90 degrees. For example, a support protrusion 43 having a sharp tip and a triangular section is provided at an angular pitch of 5 mm. The flange portion 42 can be in close contact with the circular inner peripheral surface 46 of the housing cylinder 27 by the arcuate surfaces 45 and 45 facing each other.

  Further, as shown in FIG. 6, a first engagement circumferential groove (front engagement circumference) having a groove depth of about 7.2 mm and a groove depth of about 0.2 mm is formed in the front and rear portions of the intermediate shaft portion 39. Groove) 47 and a second engagement circumferential groove (rear engagement circumferential groove) 49 are provided continuously in the circumferential direction, and between the first and second engagement circumferential grooves 47, 49. An engaging protrusion 50 that is continuous in the circumferential direction is interposed. In the present embodiment, the first groove lower end 51 and the second groove lower end 52 on the opposite side of the first and second engaging circumferential grooves 47 and 49 are formed on a right angle surface. Further, a fixed circumferential groove 53 having a groove depth of, for example, about 0.2 mm is provided on the rear side of the second engagement circumferential groove 49.

  As shown in FIG. 2, the reed switch 7 is accommodated at the front side of the accommodation hole 41, and the exposed core wires 59, 60 of the electric wire 13 are soldered to the electrodes 56, 57. Has been. In this state, the reed switch 7 is fixed in position by the epoxy resin 61 filled in the accommodation hole 41.

  Also, as shown in FIGS. 3 to 4 and 6, the sliding magnet 6 having an annular shape provided with an insertion hole 62 in the axial direction is attached by inserting the intermediate shaft portion 39 into the insertion hole 62. It is done. The diameter of the insertion hole 62 of the sliding magnet 6 is slightly larger (about 0.5 mm larger) than the maximum diameter of the intermediate shaft portion 39 (the outer diameter of the engaging protrusion 50 is the maximum diameter). As shown in an enlarged view in FIG. 6, both end edges of the insertion hole 62 are a first arc-shaped projecting edge (front arc-shaped projecting edge) 65 and a second arc-shaped projecting edge (rear arc-shaped projecting edge). It is formed as a protruding edge 66. The groove widths of the first and second engaging circumferential grooves 47 and 49 are set to be much larger than the thickness (length in the axial direction) of the sliding magnet 6. The margin is, for example, about 0.2 mm. Accordingly, as shown in FIGS. 7 to 8, 14, and 16, the sliding magnet 6 slides on the intermediate shaft portion 39, and the inner peripheral edge portion 67 of the insertion hole 62 has the first and second portions. The engagement circumferential grooves 47 and 49 can be engaged with each other, and in this state, a play of movement of about 0.2 mm occurs in the axial direction of the intermediate shaft portion 39. This play absorbs an error in manufacturing the sliding guide shaft 5 and the sliding magnet 6 so that the inner peripheral edge portion 67 of the insertion hole 62 does not fit into the first and second engaging circumferential grooves 47 and 49. It is provided to prevent the situation.

  7 to 8 are enlarged views showing the main configuration of the float switch 1 together with the action, and are plan sectional views when the float switch 1 is viewed in a horizontal state. A state in which the inner peripheral edge portion 67 of the insertion hole 62 is fitted in the first and second engaging circumferential grooves 47 and 49 is not shown. Further, an inner peripheral edge portion 71 of a circular hole portion 70 of a C-shaped fixing piece 69 as shown in FIGS. 3 to 4 and 6 is fitted into the fixed circumferential groove 53 as shown in FIGS. Thereby, the fixed piece 69 is fixed to the sliding guide shaft 5. The front and rear side surfaces 68 and 72 (FIGS. 3 to 4) of the fixed piece 69 are provided with support projections 73 and 75 having a sharp tip and a triangular section at an angular pitch of 90 degrees.

  As shown in FIGS. 3 to 4, the holding magnets 9 a and 10 a have an annular shape in which mounting holes 79 and 80 through which the front and rear end portions 76 and 77 of the sliding guide shaft 5 are inserted are provided concentrically. For convenience, the holding magnet 9a positioned in front is referred to as a first holding magnet, and the holding magnet 10a positioned in the rear is referred to as a second holding magnet. FIG. 2 shows a state in which the first and second holding magnets 9a and 10a are fixed. When fixed in this way, the rear magnetic pole of the first holding magnet 9a is connected to the sliding magnet 6 as shown in FIG. The front magnetic pole of the second holding magnet 10 a is different from the rear magnetic pole of the sliding magnet 6.

  Next, the step of assembling the sliding magnet 6 having such a configuration, the front and rear holding magnets 9a, 10a, and the C-shaped fixing piece 69 to the sliding guide shaft 5 in the housing cylinder 27 is shown in FIG. This will be described with reference to FIG.

  First, the rear end side of the sliding guide shaft 5 is inserted into the insertion hole 62 of the sliding magnet 6, and the sliding magnet 6 is positioned on the intermediate shaft portion 39. Thereafter, the fixed piece 69 is fitted into the fixed circumferential groove 53 as described above, and the first and second holding magnets are disposed at the front and rear ends 76 and 77 of the sliding guide shaft 5 as described above. Wear 9a, 10a. Thereafter, the rear end shaft portion 40 of the sliding guide shaft 5 is fitted into the concave portion 31 of the housing cylinder 27, and the arcuate surfaces 45, 45 of the flange 42 are opposed to the housing cylinder 27. The inner peripheral surface 46 is in a close contact state. Thereby, the sliding guide shaft 5 is accommodated concentrically in the accommodating cylinder 27. Thus, by inserting the rear end shaft portion 40 into the recess 31, the rear surface 83 of the outer peripheral edge portion 81 of the fixed piece 69 comes into contact with the step 34 as shown in FIG. The holding magnet 10a is clamped by the tip 85 of the support projection 75 projecting from the rear side of the fixed piece 69 and the tip 86 of the support projection 33 projecting from the bottom 29. The second holding magnet 10a is provided in a fixed state on the rear end side of the slide guide shaft 5 (the rear end side of a slide chamber 84 described later). The sliding guide shaft 5 has a gap between the outer portion of the intermediate shaft portion 39 between the flange portion 42 and the fixed piece 69 and the inner peripheral surface 46 of the housing cylinder 27. The sliding chamber 84 of the moving magnet 6 is used.

  Thereafter, the first holding magnet 9a is moved to the front end side of the sliding guide shaft 5 by inserting the annular case 87 holding the front end portion 35 of the housing cylinder 27 into the front float portion 15. (A front end side of the sliding chamber 84) is provided in a fixed state.

  As shown in FIGS. 3 to 4, the annular case 87 has a cylindrical shape in which the rear end is open and the front end is provided with a wire insertion hole 89, and the outer peripheral surface 90 is a cone of the front float portion 15. When the front float portion 15 and the rear float portion 17 are fitted as shown in FIG. 2, the rear end peripheral surface 92 of the annular case 87 is the float core body. The float core body 22 is fixed in position in the float main body 21 by pressing the front surface 93 of 22. In this state, the rear ends 96, 96, 96, 96 (FIG. 4) of the projecting pieces 95, 95, 95, 95 projecting at an angular pitch of 90 degrees in the circumferential direction inside the annular case 87 The front surface 97 of the first holding magnet 9a is pressed toward the flange portion 42 (FIG. 2), so that the first holding magnet 9a is moved toward the front end side of the sliding guide shaft 5 (as described above). It is provided in a fixed state on the front end side of the sliding chamber 84.

  In this state, the rectangular cutouts 36, 36, 36, 36 formed at the front end of the housing cylinder 27 are arranged at an angular pitch of 90 degrees on the inner peripheral edge on the front side inside the annular case 87. The protruding partition pieces 99, 99, 99, 99 (FIG. 4) are fitted. The front end portions 37a, 37a, 37a, 37a of the four rectangular protrusions 37, 37, 37, 37 are formed between the adjacent partition pieces 99, 99 in the front end portion inside the annular case 87. A state in which the state in which the housing cylinder 27 is inserted into the insertion hole 23 of the float core body 22 is prevented from rotating through the annular case 87 by being fitted into the arcuate groove 100 (FIG. 4). Held in. Then, after mounting the annular case 87 in this way, in order to perform water-tight processing on the portion of the electric wire 13 in the annular case 87, as shown in FIG. And so on.

  In this way, the first and second holding magnets 9a and 10b are fixedly provided on the front and rear end sides of the sliding guide shaft 5 (front and rear end sides of the sliding chamber 84). The second holding magnets 9a and 10a can hold the sliding magnet 6 by suction as shown in FIGS. That is, as shown in FIG. 9, when the float 2 tilts upward, the second holding magnet (the holding magnet positioned above) until the float 2 tilts upward to a set angle (for example, an angle close to 90 degrees). 10a can attract and hold the sliding magnet 6 through the fixed piece 69. Then, as shown by a solid line in FIG. 1 and as shown in FIG. 10, when the float 2 is tilted upward beyond the set angle (for example, tilted upward by about 90 degrees), the suction holding is It is set to be released by the action of gravity. As shown in FIG. 11, when the float 2 tilts downward, the first holding magnet (located above) is tilted until the float 2 tilts downward to a set angle (for example, an angle close to 90 degrees). The holding magnet) 9a can hold the sliding magnet 6 by suction through the flange 42. Then, as shown in FIG. 12, when the float 2 is tilted downward by more than the set angle (for example, when tilted downward by about 90 degrees), the suction holding is released by the action of gravity. Is set.

  As shown in FIG. 10, the attracting state between the second holding magnet 10a and the sliding magnet 6 is released in a state where the float 2 is tilted upward by approximately 90 degrees. The sliding magnet 6 slides (drops) along the intermediate shaft portion 39 in a direction approaching the reed switch 7 (downward). Then, the contact 8 of the reed switch 7 is closed in a state where the sliding magnet 6 is supported by the support protrusion 43 of the flange 42 (FIGS. 7 and 10). On the contrary, as shown in FIG. 12, the attracted state between the first holding magnet 9a and the sliding magnet 6 is released in a state where the float 2 is inclined downward by about 90 degrees. When the sliding magnet 6 slides (drops) along the intermediate shaft portion 39 in the direction away from the reed switch 7 (downward), the contact 8 of the reed switch 7 is opened (FIG. 8). , FIG. 12).

  In the present embodiment, as described above, since the first engagement circumferential groove 47 and the second engagement circumferential groove 49 are provided before and after the intermediate shaft portion 39, the first and second engagements are provided. Next, the operation of the circumferential grooves 47 and 49 will be described.

  As shown in FIG. 12, when the water level in the water tank is at the lower limit water level (the stop water levels L1, L2) of the set water level width, the sliding magnet 6 is positioned in the second engagement circumferential groove 49. The sliding magnet 6 and the second holding magnet (lower holding magnet) 10a are in the attracted state. At this time, the contact 8 of the reed switch 7 is in an open state. When the water level in the water tank rises from this state, the float 2 tilts upward. The second holding magnet 10a and the sliding magnet 6 are required to continue to be attracted until the set angle is inclined upward. FIG. 9 shows the adsorption state.

  However, as in the case of a septic tank, for example, a sudden undulation may occur on the liquid surface due to fluctuations in the inflow of the liquid, and the second holding magnet 10a and the sliding magnet 6 are affected by the undulation. In some cases, the adsorbed state is temporarily released. Even when the attracted state is released in this way, as shown in FIG. 13, the second groove lower end (the end located on the engagement protrusion 50) 52 of the second engagement circumferential groove 49. However, since the first arcuate protruding edge 65 of the insertion hole 62 of the sliding magnet 6 is supported, there is no possibility that the sliding magnet 6 slides (falls) further downward. Then, in this supported state, about 0.2 mm is provided between the upper surface 102 of the sliding magnet 6 and the lower surface 103 (the tip of the support protrusion 75) 103 of the fixed piece 69. However, since the gap G is very small, the second holding magnet 10a and the sliding magnet 6 can be attracted again as shown in FIG. If the second engagement circumferential groove 49 is not provided, the sliding magnet 6 will inadvertently slide (drop) in the direction approaching the reed switch 7 before reaching the set angle. As a result, the contact 8 of the reed switch 7 is closed, which is not preferable.

  Then, as shown in FIG. 10, when the water level in the water tank reaches the upper limit water level (the startup water levels H1, H2) of the set water level width, the float 2 is tilted more than a set angle and the second holding is performed. The attracting state of the magnet 10a is released by the action of gravity, and the engagement (FIG. 13B) between the second groove lower end 52 and the first arcuate protruding edge 65 is also released. As described above, the disengagement is formed such that the diameter of the insertion hole 62 of the sliding magnet 6 is slightly larger than the maximum diameter of the intermediate shaft portion 39 (the outer diameter of the engaging protrusion 50). However, since both end edges of the insertion hole 62 are formed as arc-shaped projecting edges 65 and 66, it is easily performed by the action of gravity. . As a result, as shown in FIG. 10, the sliding magnet 6 slides in the direction approaching the reed switch 7, and the sliding magnet 6 is positioned in the first engagement circumferential groove 47. Then, the sliding magnet 6 is supported by the support protrusion 43 of the flange 42, and the first holding magnet 9a and the sliding magnet 6 are in an attracted state via the flange 42. Become. In this state, the contact 8 of the reed switch 7 is closed as described above (FIGS. 7 and 10).

  On the contrary, when the float 2 is tilted downward by the lowering of the water level in the water tank or the like from the state in which the sliding magnet 6 and the first holding magnet 9a are attracted in this way, the float 2 is directed downward to the set angle. The first holding magnet 9a must hold the sliding magnet 6 by suction until it is tilted. However, the attracting state between the first holding magnet 9a and the sliding magnet 6 may be temporarily released due to the influence of the wave generated in the water tank or the like. Even if the suction state is released in this way, as shown in FIG. 15, the first groove lower end of the first engagement circumferential groove 47 (the end located above the engagement protrusion 50). Since 51 supports the second arc-shaped protruding edge 66 of the insertion hole 62 of the sliding magnet 6, there is no possibility that the sliding magnet 6 slides (falls) further downward. In the state of being supported in this manner, a gap of about 0.2 mm is provided between the surface 103 positioned on the sliding magnet 6 and the lower surface of the flange portion 42 (the tip of the support projection 43). Although G is generated, the gap G is very small, so that the first holding magnet 9a and the sliding magnet 6 can be attracted again as shown in FIG. If the first engaging circumferential groove 47 is not provided, the sliding magnet 6 will inadvertently slide (drop) in a direction away from the reed switch 7 before reaching the set angle. This is not preferable because the contact 8 of the reed switch 7 opens.

  When the float 2 is tilted downward by a set angle or more and the attracting state between the first holding magnet 9a and the sliding magnet 6 is released by the action of gravity, the engagement protrusion 50 and the second The engagement with the arcuate protruding edge 66 (FIG. 15B) is also released. As described above, the disengagement is formed such that the diameter of the insertion hole 62 of the sliding magnet 6 is slightly larger than the maximum diameter of the intermediate shaft portion 39 (the outer diameter of the engaging protrusion 50). However, since both end edges of the insertion hole 62 are formed as arc-shaped protruding edges, it is easily performed by the action of gravity. As a result, as shown in FIG. 12, the sliding magnet 6 slides away from the reed switch 7, and the sliding magnet 6 is positioned in the second engagement circumferential groove 49. Then, the sliding magnet 6 is supported by the support projection 43 of the fixed piece 69, and the second holding magnet 10 a and the sliding magnet 6 are attracted via the fixed piece 69. It becomes. In this state, the contact 8 of the reed switch 7 is opened as described above (FIGS. 8 and 12).

  Further, the third float switch S3 for detecting the abnormal water level H3 is also constituted by a contact. This will be described in more detail with reference to FIGS. 17 to 18. As shown in FIG. 17, as shown in FIG. 17, a cylindrical switch in which a sliding guide cylinder 107 is vertically provided in a float 2 and the reed switch 7 is accommodated. A case 106 is concentrically held in the sliding guide cylinder 107, a sliding chamber 109 is formed by a gap between the two, and a sliding magnet 6 is further provided in the sliding chamber 109. 106 was slidably disposed in a state of being externally fitted to 106. When the third float switch S3 is used, as shown in FIGS. 17 to 18, the float 2 tilts as the water level changes, and the sliding magnet 6 slides the cylindrical switch case 106 in the axial direction thereof. Then, the reed switch 7 is opened and closed. The reed switch 7 is located on the base end side of the cylindrical switch case 106. When the water level rises, the float 2 tilts upward as shown in FIG. Sliding in the approaching direction, the contact 8 of the reed switch 7 is closed. On the other hand, when the water level is lowered, as shown in FIG. 18, the float 2 tilts downward, the sliding magnet 6 slides away from the reed switch 7, and the contact 8 of the reed switch 7 opens.

  Next, the first pump P1 and the second pump installed in the water tank 110 by the first float switch S1, the second float switch S2, the third float switch S3, and the automatic alternate operation control circuit. The operation of P2 will be described with reference to FIG.

  The operation of the No. 1 pump P1 is controlled by the first float switch S1 detecting the start water level H1 and the stop water level L1, and if the water in the water tank increases to reach the start water level H1. The operation is started and the drainage operation is performed, and the operation is stopped when the water in the water tank is reduced and reaches the stop water level L1.

  In the No. 2 pump P2, the second float switch S2 has a start water level H2 (a lower water level than the start water level H1 of the No. 1 pump) and a stop water level L2 (a stop water level L1 of the No. 1 pump). The operation is controlled by detecting the water level), and the operation is performed between the starting water level H2 and the stop water level L2, and one drainage operation is performed by the signal processing of the automatic alternating operation control circuit. If it stops by going, even if the inside of a water tank increases next and reaches the said starting water level H2, the stop state is hold | maintained once (it pauses).

  FIG. 19 showing the operation of the No. 1 pump P1 and No. 2 pump P2 and the relationship between the water level change and the operation switching of the No. 1 pump and No. 2 pump (the broken lines in the figure are No. 1 pump and No. 2 pump) 26, 28 showing the contact open / closed state of the first float switch S1, and FIGS. 23, 29 showing the contact open / closed state of the second float switch S2. A contact opening / closing state of the third float switch S3, FIG. 21 showing an electric circuit of the No. 2 pump P2, and FIG. 27 showing an electric circuit of the No. 1 pump P1 will be described.

  In the electric circuit diagram shown in FIG. 21, the resistance R1, the resistance R2, the capacitor C1, and the abnormal water level H3 of the input unit E1 of the automatic alternating operation control circuit that processes the water level detection signal of the second float switch S2 are set. The resistor R4, the resistor R5, and the capacitor C2 of the input unit E2 that processes the water level detection signal from the third float switch S3 to be detected constitute a chattering prevention circuit including a delay circuit.

[Pump operation state 1]
Now, as shown in FIG. 20, it is assumed that the water level in the water tank 110 is lower than the stop water level L2, and both the first float switch S1 and the third float switch S3 are in the OFF state. In this state (state a1 shown in FIG. 19), when power is turned on by the power breaker, in the electric circuit diagram of FIG. 21, the circuit control voltage is connected to the NAND Schmitt trigger IC via the capacitor C2 and the resistor R6. The pulse voltage of H level is applied to the input terminal of (IC1-4) as the pulse voltage of H level, and the pulse voltage of L level is applied to the output terminal of the NAND Schmitt trigger IC (IC1-4), that is, the set input terminal PR of the D type flip-flop IC2. Therefore, the output terminal Q of the D-type flip-flop IC2 becomes H level and the output terminal Q ′ becomes L level. Here, since the data input terminal D of the D type flip-flop IC2 is connected to the output terminal Q ', it is held at the L level.

  Next, the circuit control voltage is applied to the input terminal of the NAND Schmitt trigger IC (IC1-1) through the capacitor C1 and the resistor R3, and further through the resistor R1, the resistor R2, and the resistor R3. The output terminal of the IC (IC1-1), that is, the clock input terminal CK of the D-type flip-flop IC2 and one input terminal of the NAND Schmitt trigger IC (IC1-2) are at the L level. Since the other input terminal of the NAND Schmitt trigger IC (IC1-2) is connected to the output terminal Q of the D-type flip-flop IC2, it is at the H level. Therefore, the output terminal of the NAND Schmitt trigger IC (IC1-2) and the input terminal of the NAND Schmitt trigger IC (IC1-3) are at the H level, and the output terminal of the NAND Schmitt trigger IC (IC1-3) is at the L level. The relay Ry2 is turned off, and the No. 2 pump P2 that is activated by being supplied with electric power through the a contact Ry2-1a of the relay Ry2 is in a stopped state.

[Pump operation state 2]
Thereafter, when the inside of the water tank increases and the water level reaches the starting water level H2 as shown in FIG. 22 (state a2 shown in FIG. 19), the second float switch S2 detects the starting water level H2. The number pump P2 is maintained in a stopped state. Since the automatic alternating operation control circuit processes the detection signal of the starting water level H2 of the second float switch S2 and the No. 2 pump P2 maintains (stops) even when the starting water level H2 is reached. is there.

  The detection of the activation water level H2 by the second float switch S2 will be described. The float 2 tilts upward to a set angle at the activation water level H2 as shown in FIG. 23, whereby the second holding magnet 10a. As a result, the sliding magnet 6 slides (drops) along the intermediate shaft portion 39 in a direction approaching the reed switch 7 (downward). ) As a result, the contact 8 of the reed switch 7 is closed, and the second float switch S2 detects the starting water level H2.

  Further explanation will be made based on the electric circuit diagram of FIG. 21. When the water level in the water tank rises and reaches the activation water level H2, the second float switch S2 is turned on, and the NAND Schmitt trigger IC (IC1-1). The input terminal of the NAND Schmitt trigger IC (IC1-1) is at the H level via the resistors R2 and R3. This H level voltage is applied to the clock input terminal CK of the D-type flip-flop IC (IC2). When the H level voltage applied to the clock input terminal CK of the D type flip-flop IC (IC2) rises from the L level to the H level, the data input terminal of the D type flip flop IC (IC2) has already been used as data. The L level signal applied to D is output to the output terminal Q of the D type flip-flop IC (IC2) and applied to one input terminal of the NAND Schmitt trigger IC (IC1-2). The other input terminal of the NAND Schmitt trigger IC (IC1-2) is connected to the output terminal of the NAND Schmitt trigger IC (IC1-1) and becomes H level. Accordingly, since the output terminal of the NAND Schmitt trigger IC (IC1-2) and the input terminal of the NAND Schmitt trigger IC (IC1-3) are at the H level, the output terminal of the NAND Schmitt trigger IC (IC1-3) is at the L level. Then, the transistor Tr and the relay Ry2 are turned off, and the No. 2 pump P2 that is in the operating state by being supplied with electric power through the a contact Ry2-1a of the relay Ry2 maintains the stopped state.

[Pump operation state 3]
Since the No. 2 pump P2 maintains the stopped state (pauses), the inside of the water tank further increases. When the water level in the aquarium reaches the starting water level H1 as shown in FIG. 24 (state a3 shown in FIG. 19), the first float switch S1 detects the starting water level H1, thereby the No. 1 pump. P1 enters the operating state. At this time, the No. 2 pump P2 maintains a stopped state.

  After that, when the water in the tank is reduced and the water level becomes the stop water level L1 as shown in FIG. 25 (state of a4 shown in FIG. 19), the first float switch S1 detects the stop water level L1, The No. 1 pump P1 stops.

  The detection of the activation water level H1 by the first float switch S1 will be described. As shown in FIG. 26, when the float 1 is inclined upward to a set angle at the activation water level H1, the second holding magnet 10a and The attracted state between the sliding magnet 6 and 6 is released. As a result, the sliding magnet 6 slides (drops) along the intermediate shaft portion 39 in the direction approaching the reed switch 7 (downward). To do. As a result, the contact 8 of the reed switch 7 is closed, the first float switch S1 is in the ON state in which the activation water level H1 is detected, and the relay Ry1 is in the ON state in the electric circuit diagram shown in FIG. Therefore, electric power is supplied through the a contact Ry1-1a of the relay Ry1, and the No. 1 pump P1 is in an operating state to drain the water tank.

  The detection of the stop water level L1 by the first float switch S1 will be described. The float 2 tilts downward to a set angle at the stop water level L1 as shown in FIG. The attracted state with the sliding magnet 6 is released, and as a result, the sliding magnet 6 slides (drops) along the intermediate shaft portion 39 in a direction away from the reed switch 7 (downward). As a result, the contact 8 of the reed switch 7 is opened, the first float switch S1 is in the OFF state where the stop water level L1 is detected, and the relay Ry1 is in the OFF state in the electric circuit diagram shown in FIG. Therefore, the No. 1 pump P1 to which electric power has been supplied via the a contact Ry1-1a of the relay Ry1 stops.

[Pump operation state 4]
Next, when the water in the water tank increases and the water level in the water tank reaches the activation water level H2 (state a5 shown in FIG. 19), which is the same as that shown in FIG. 22, the second float switch S2 is changed to FIG. In the same manner as shown in FIG. 5, the activation level H2 is detected and the NAND Schmitt trigger IC (IC1-1) has an input terminal at the L level via the resistors R2 and R3, and the NAND Schmitt trigger IC (IC1-1). ) Is at the H level. This H level voltage is applied to the clock input terminal CK of the D-type flip-flop IC (IC2). When the H level voltage applied to the clock input terminal CK of the D type flip-flop IC (IC2) rises from the L level to the H level, the data input terminal of the D type flip flop IC (IC2) has already been used as data. The H level signal applied to D is output to the output terminal Q of the D type flip-flop IC (IC2), and the L level is output to the output terminal Q ′. The output level of the output terminal Q and output terminal Q ′ of the D type flip-flop IC (IC2) is such that the H level voltage applied to the clock input terminal CK of the D type flip flop IC (IC2) is from the L level. It changes alternately every time it rises to H level.

  Here, the H level voltage output to the output terminal Q of the D-type flip-flop IC (IC2) is applied to one input terminal of the NAND Schmitt trigger IC (IC1-2). The other input terminal of the NAND Schmitt trigger IC (IC1-2) is connected to the output terminal of the NAND Schmitt trigger IC (IC1-1) and becomes H level. Accordingly, since the output terminal of the NAND Schmitt trigger IC (IC1-2) and the input terminal of the NAND Schmitt trigger IC (IC1-3) are at L level, the output terminal of the NAND Schmitt trigger IC (IC1-3) is at H level. Since the base current flows to the transistor Tr via the resistor R7 and the transistor Tr is turned ON, the relay Ry2 is turned ON, and the second pump P2 to which power is supplied via the a contact Ry2-1a of the relay Ry2, Start driving.

  In this way, when the water level in the water tank rises to the water level of H2, drainage is performed by starting the No. 2 pump P2. When the water level drops to the stop water level L2 due to this drainage (state a6 shown in FIG. 19), the second float switch S2 is turned OFF, and in the electric circuit diagram of FIG. 21, the circuit control voltage is the capacitor C1 and the resistance. The voltage is applied as an H level voltage to the input terminal of the NAND Schmitt trigger IC (IC1-1) through R3, and further through the resistor R1, the resistor R2, and the resistor R3, that is, the output terminal of the NAND Schmitt trigger IC (IC1-1), that is, The clock input terminal CK of the D-type flip-flop IC (IC2) and one input terminal of the NAND Schmitt trigger IC (IC1-2) are at the L level. The other input terminal of the NAND Schmitt trigger IC (IC1-2) is connected to the output terminal Q of the D-type flip-flop IC (IC2) and maintains the H level state. Accordingly, since the output terminal of the NAND Schmitt trigger IC (IC1-2) and the input terminal of the NAND Schmitt trigger IC (IC1-3) are at the H level, the output terminal of the NAND Schmitt trigger IC (IC1-3) is at the L level. Then, the transistor Tr and the relay Ry2 are turned OFF, and the No. 2 pump P2 to which power is supplied via the a contact Ry2-1a of the relay Ry2 is stopped.

[Pump operation state 5]
While the No. 2 pump P2 is maintained in a stopped state (rested) as described above, the inside of the water tank further increases, and the water level in the water tank is the same as that shown in FIG. (The state of a7 shown in FIG. 19), the first float switch S1 becomes the ON state in which the starting water level H1 is detected as shown in FIG. 26, and the No. 1 pump P1 is started. The water in the tank will be drained. In this way, the water in the water tank is drained by the intermittent intermittent operation of the No. 1 pump P1 and the No. 2 pump P2.

  Drainage in the water tank is performed by such intermittent intermittent operation. When the water inside the water tank abnormally increases and the water level in the water tank reaches the abnormal water level H3 as shown in FIG. 30 (a8 shown in FIG. 19). ), When the third float switch S3 detects the abnormal water level H3, the No. 2 pump P2 is also started. The detection of the activation water level H3 by the third float switch S3 will be described. When the float 2 is tilted upward to the set angle at the abnormal water level H3 as shown in FIG. Slide (drop) in a direction approaching the reed switch 7 (downward). As a result, the contact 8 of the reed switch 7 is closed and the third float switch S3 is in an ON state in which the abnormal water level H3 is detected. As a result, the No. 2 pump P2 that has been stopped is also started. Rapid drainage is performed by two submersible pumps, No. 1 pump P1 and No. 2 pump P2. Then, when the water level in the water tank reaches the stop water level L2 (state a9 shown in FIG. 19), as shown in FIG. 25, the second float switch S2 moves to the stop water level as shown in FIG. The L2 is detected and the No. 2 pump P2 stops. Next, when the water level in the water tank reaches the stop water level L1 shown in FIG. 1 (state a10 shown in FIG. 19), the first float switch S1 detects the stop water level L1 as shown in FIG. The first pump P1 is also stopped.

  If this is explained based on the electric circuit diagram of FIG. 21, as described above, drainage in the water tank is performed by alternate intermittent operation of the No. 1 pump P1 and the No. 2 pump P2, but the inside of the water tank is abnormal. When the water level increases to the abnormal water level H3, the third float switch S3 for detecting the abnormal water increase is turned on regardless of the operation of the two submersible pumps No. 1 pump P1 and No. 2 pump P2. The circuit control voltage is applied as an H level voltage to the input terminal of the NAND Schmitt trigger IC (IC1-4) via the resistor R5 and the resistor R6, and the output terminal of the NAND Schmitt trigger IC (IC1-4), that is, the D type. An L level pulse voltage is applied to the set input terminal PR of the flip-flop IC (IC2). When an L-level pulse voltage is applied to the set input terminal PR of the D-type flip-flop IC (IC2), the clock input terminal CK of the D-type flip-flop IC (IC2) and the data of the D-type flip-flop IC (IC2) Regardless of the input voltage at the input terminal D, the output terminal Q of the D-type flip-flop IC (IC2) is preferentially at the H level, and the output terminal Q ′ and the data input terminal D are at the L level.

  Here, since one input terminal of the NAND Schmitt trigger IC (IC1-2) is connected to the output terminal Q, it is applied as an H level voltage, and the second float switch S2 is turned on at the abnormal water level H3. Thus, the input terminal of the NAND Schmitt trigger IC (IC1-1) becomes L level via the resistors R2 and R3, and the output of the NAND Schmitt trigger IC (IC1-1) becomes H level. This H level voltage is applied to the clock input terminal CK of the D-type flip-flop IC (IC2) and the other input terminal of the NAND Schmitt trigger IC (IC1-2). Accordingly, the output terminal of the NAND Schmitt trigger IC (IC1-2) and the input terminal of the NAND Schmitt trigger IC (IC1-3) are at L level, so that the output terminal of the NAND Schmitt trigger IC (IC1-3) is at H level, and the resistance Since the base current flows to the transistor Tr via R7 and the transistor Tr is turned ON, the relay Ry2 is turned ON, and the No. 2 pump P2 to which power is supplied via the a contact Ry2-1a of the relay Ry2 starts operation. To do.

  Therefore, for example, when the water tank abnormally increases during the drainage by the No. 1 pump P1 and reaches the starting water level H3 (state a8 shown in FIG. 19), as shown in FIG. 31, the third float switch S3 Becomes the ON state where the activation water level H3 is detected, and the No. 2 pump P2 is also activated. As a result, rapid drainage is performed by two submersible pumps, No. 1 pump P1 and No. 2 pump P2. When the water level in the water tank reaches the stop water level L2 (state a9 shown in FIG. 19), the second float switch S2 enters the OFF state in which the stop water level L2 is detected, as shown in FIG. The No. 2 pump P2 stops. Next, when the water level in the water tank reaches the stop water level L1 shown in FIG. 1 (state a10 shown in FIG. 19), the first float switch S1 detects the stop water level L1 as shown in FIG. The first pump P1 is also stopped.

  Further, when the water tank abnormally increases during drainage by the No. 2 pump P2 and reaches the starting water level H1, the No. 1 pump P1 is also started, and rapid drainage by two submersible pumps is performed. When the water level in the water tank reaches the stop water level L2, the No. 2 pump P2 is stopped in the same manner as described above, and then when the water level in the water tank reaches the stop water level L1, the same as above. No. 1 pump P1 also stops.

  When either one of the submersible pumps breaks down, the other pump performs automatic operation independently in the range from the start water level to the stop water level. Now, in the case of failure of the No. 2 pump P2, when the water in the water tank increases and the water level in the water tank reaches the starting water level H1, the first float switch S1 is The ON water level H1 is detected and the No. 1 pump P1 is started. When the water level in the water tank reaches the stop water level L1, as shown in FIG. 28, the first float switch S1 enters the OFF state in which the stop water level L1 is detected, and the No. 1 pump P1 stops. . Then, when the inside of the water tank increases and the water level in the water tank becomes the water level of the activation water level H1, the No. 1 pump P1 is activated again and the drainage work is performed. The No. 1 pump P1 repeats this operation.

  On the other hand, when the No. 1 pump P1 breaks down, while the No. 2 pump P2 is in the stopped state (rested) as described above, the water in the water tank increases and the water level in the water tank When the water level reaches the abnormal water level H3, the third float switch S3 is turned on when the abnormal water level H3 is detected, whereby the No. 2 pump P2 is activated and the drainage operation is performed. Then, when the water level in the water tank reaches the stop water level L2, as shown in FIG. 29, the second float switch S2 enters the OFF state in which the stop water level L2 is detected, and the No. 2 pump P2 stops. . After that, the No. 2 pump P2 maintains the stopped state (pauses) as described above. However, when the water level in the water tank increases and the water level in the water tank reaches the water level of the abnormal water level H3, The pump P2 is activated and the drainage work is performed. The No. 2 pump P2 repeats this operation.

[Example 2]
The present invention is by no means limited to those shown in the above-described embodiments, and it goes without saying that various design changes can be made within the scope of the claims. One example is as follows.

  (1) The third float switch S3 is not limited to the float switch having the above-described configuration, and various types of float switches that are conventionally used can be used.

  (2) FIG. 32 shows that a first engagement is made before and after the engagement protrusion 115 by projecting an engagement protrusion in the circumferential direction at an intermediate portion in the longitudinal direction of the sliding guide shaft 5. The case where the circumferential groove 47 and the second engagement circumferential groove 49 are formed is shown, and the inner circumferential edge portion 67 of the insertion hole 62 of the sliding magnet 6 is fitted into the engagement circumferential grooves 47 and 49. . The hole diameter of the insertion hole 62 is slightly larger than the outer diameter of the engaging protrusion 115. When the float 2 is smaller than the set angle, the second diameter of the engaging protrusion 115 is set as both ends. The first and second groove lower ends 51 and 52 can support the arc-shaped projecting edges 65 and 66 of the end of the insertion hole 62, and when the float 2 is inclined upward or downward beyond a set angle, As shown in FIGS. 32B and 32C, the engagement protrusion 110 and the arcuate protrusions 65 and 66 are disengaged so that the sliding magnet 6 slides downward (drops). Has been made. FIG. 32B shows a state in which the float 2 is tilted upward by a set angle or more, and the contact 8 of the reed switch 7 is closed. FIG. 19C shows a state in which the float 2 is tilted downward beyond the set angle, and the contact 8 of the reed switch 7 is open.

(3) When the engagement circumferential grooves 47 and 49 are provided in the sliding guide shaft 5, the margin provided in the engagement circumferential grooves 47 and 49 is an error in manufacturing the sliding guide shaft 5 and the sliding magnet 6. It is set in consideration of the range, and is usually about 0.1 to 1 mm.
The groove depths of the engagement circumferential grooves 47 and 49 are set as follows. That is, in the state where the float 2 is inclined at an angle smaller than the set angle, the sliding magnet 6 is supported by the first magnet when the holding and holding by the holding magnets 9a and 10a is released by the undulation of the liquid surface. In the state in which the second groove lower end 51, 52 can be surely performed and the float 2 is inclined more than the set angle, the arcuate protrusion of the edge of the insertion hole 62 of the holding magnets 9a, 10a. The engagement between the edges 65 and 66 and the first and second groove lower ends 51 and 52 is released so that the sliding magnet 6 can slide (drop) the intermediate shaft 39. Usually, it is set to 0.2 to 1 mm.

  (4) The engagement protrusion formed between the first and second engagement circumferential grooves 47 and 49 may be formed in a state where it is interrupted in the circumferential direction.

  (5) In FIG. 33, the first and second groove lower ends 51 and 52 on the opposite sides of the first and second engaging circumferential grooves 47 and 49 are not slightly perpendicular surfaces as shown in FIG. The case where it forms in the inclined surface is shown. When the groove depths of the engagement circumferential grooves 47 and 49 are formed to be relatively large, for example, about 1 mm, they may be formed on such inclined surfaces.

  (6) When the magnetic portions 9 and 10 provided at both ends of the sliding chamber 84 are configured as holding magnets 9a and 10a, means for providing the holding magnets 9a and 10a in a fixed state are the same as those shown in the above embodiment. The holding magnets 9a and 10a may be provided by adhesion. Further, the holding state of the holding magnets 9a, 10a and the sliding magnet 6 may be configured such that the magnets are directly adsorbed. The magnetic portions 9 and 10 can be formed of an annular metal piece such as a steel material that is attracted to the magnet, but in this case, the magnetic portions 9 and 10 can be similarly configured.

  (7) The sliding guide shaft 5 is subjected to a slip facilitating treatment with a fluororesin dispersion or a boron nitride fine particle dispersion on the outer surface of the sliding portion of the sliding magnet 6 or the surface of the sliding magnet 6. It is preferable that the sliding magnet 6 slide more smoothly.

  (8) The accommodation space 3 for receiving the sliding guide shaft 5 may be provided in the float 2 while ensuring water tightness, and is configured using the cylindrical accommodation cylinder 27 described above. It is not specified in what is done.

  (9) In the above-described embodiment, the attracting state between the magnetic portions 9 and 10 and the sliding magnet 6 is released by a sudden wave, and the sliding magnet 6 slides inadvertently downward (drops). In order to surely prevent this, the structure in which the engagement guide grooves 47 and 49 are provided in the sliding guide shaft 5 is employed. However, such a sudden ripple does not occur or the influence of such a ripple is generated. In a float switch that is used in a state where it is difficult to receive, as shown in FIG. 34, such an engagement circumferential groove may be omitted.

  (10) The side surface of the fixed piece 69 and the rear surface of the flange 42 may be formed as a smooth surface that does not include the support protrusion.

It is explanatory drawing explaining operation | movement of the float switch which comprises the apparatus based on this invention. It is sectional drawing explaining the structure of a 1st float switch and a 2nd float switch. It is a disassembled perspective view of the float switch. It is a disassembled perspective view of the float switch. It is a partially cutaway perspective view showing an accommodation cylinder. It is a perspective view which shows a sliding guide shaft, a sliding magnet, and a fixed piece. It is sectional drawing which shows the state which the contact of the reed switch closed. It is sectional drawing which shows the state which the contact of the reed switch opened. It is sectional drawing which shows the state which the float rotated upwards in the state which the 2nd holding magnet and the sliding magnet adsorb | sucked. It is sectional drawing which shows the state which the float inclined to the upward setting angle and the sliding magnet fell. It is sectional drawing which shows the state which the float inclined downward in the state which the 1st holding magnet and the sliding magnet adsorb | sucked. It is sectional drawing which shows the state which the float tilted to the downward setting angle and the sliding magnet fell. It is sectional drawing which shows the state in which the sliding magnet was supported by the groove lower end of the 2nd engagement surrounding groove. It is sectional drawing which shows the state which the 2nd holding magnet and the sliding magnet adsorb | sucked. It is sectional drawing which shows the state in which the sliding magnet was supported by the groove lower end of the 1st engagement surrounding groove. It is sectional drawing which shows the state which the 1st holding magnet and the sliding magnet adsorb | sucked. It is sectional drawing which shows the structure of a 3rd float switch in the state which the contact of the reed switch closed. It is sectional drawing which shows a 3rd float switch in the state which the contact opened. It is explanatory drawing which shows the relationship of the water level change of a water tank, and operation switching of No. 1 pump and No. 2 pump. It is explanatory drawing which shows the state of the 1st, 2nd, 3rd float switch when the water level in a water tank is lower than the stop water level L2. It is an electric circuit diagram of No. 2 pump. It is explanatory drawing which shows the state of the 1st, 2nd, 3rd float switch when the water level in a water tank exists in the starting water level H2. It is sectional drawing which shows the closed state of the contact of the 2nd float switch when the water level in a water tank exists in the starting water level H2. It is explanatory drawing which shows the state of the 1st, 2nd, 3rd float switch when the water level in a water tank exists in the starting water level H1. It is explanatory drawing which shows the state of the 1st, 2nd, 3rd float switch when the water level in a water tank exists in the stop water level L1. It is sectional drawing which shows the closed state of the contact of the 1st float switch when the water level in a water tank exists in the starting water level H1. It is an electric circuit diagram of No. 1 pump. It is sectional drawing which shows the open state of the contact of a 1st float switch when the water level in a water tank exists in the stop water level L1. It is sectional drawing which shows the open state of the contact of the 2nd float switch when the water level in a water tank exists in the stop water level L2. It is explanatory drawing which shows the state of the 1st, 2nd, 3rd float switch when the water level in a water tank exists in the abnormal water level H3. It is sectional drawing which shows the closed state of the contact of the 3rd float switch when the water level in a water tank exists in H3. The part which shows the float switch which formed the 1st engagement circumferential groove and the 2nd engagement circumferential groove by projecting the engagement protrusion in the intermediate part of a sliding guide shaft with the opening and closing action of the contact of a reed switch It is sectional drawing. It is a fragmentary sectional view which shows the float switch which formed the groove lower end which the 1st engagement circumferential groove and the 2nd engagement circumferential groove oppose in the inclined surface. It is a fragmentary sectional view which shows the float switch which provides the sliding guide shaft by which the 1st, 2nd engagement circumferential groove was abbreviate | omitted.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Apparatus 2 Float 3 Accommodating space 5 Sliding guide shaft 6 Sliding magnet 7 Reed switch 8 Contact 9 Magnetic part 10 Magnetic part 27 Accommodating cylinder 39 Intermediate shaft part 47 First engagement circumferential groove 49 Second engagement Circumferential groove 51 First groove lower end 52 Second groove lower end 62 Insertion hole 65 Arc-shaped projecting edge 66 Arc-shaped projecting edge 84 Sliding chamber P1 No. 1 pump P2 No. 2 pump H1 No. 1 pump starting water level H2 No. 2 pump Start water level H3 Abnormal water level L1 Stop water level of No. 1 pump L2 Stop water level of No. 2 pump S1 First float switch S2 Second float switch S3 Third float switch

Claims (3)

A submersible pump automatic alternating operation device in which two submersible pumps, an electric No. 1 pump and No. 2 pump, are automatically controlled alternately.
A second float switch that detects both the starting water level and the stopping water level of the No. 2 pump, a higher water level than the second float switch, and the starting water level and the stopping water level of the No. 1 pump; A first float switch capable of detecting both of them alone, a third float switch capable of detecting an abnormal water level higher than the first float switch, an automatic alternating operation control circuit, and By the start water level detection signal of the second float switch of the No. 2 pump, the operation mode and the operation stop mode of the No. 2 pump can be switched to control the alternate operation,
Both the first float switch and the second float switch have the same configuration, and the sliding magnet is slid by the tilt of the float as the water level rises and falls, and the contact of the reed switch is made by the sliding. The storage space is provided in the float while ensuring watertightness, and a sliding guide shaft that stores the reed switch is placed in the storage space, and the sliding space of the storage space is provided. An outer space portion of the moving guide shaft is used as a sliding chamber, the sliding guide shaft is inserted into the insertion hole of the sliding magnet, and the sliding magnet is moved in the sliding chamber by the tilting of the float. It can be slid in the axial direction of the shaft, and magnetic parts are provided at both ends of the sliding chamber, and when the float tilts upward, it is positioned upward until the float tilts upward to a set angle. To do And the sliding magnet is in an attracting state, tilted upward by more than the set angle, and the attracting state is released by the action of gravity, so that the sliding magnet approaches the reed switch. While sliding downward along the sliding guide shaft, the contact point of the reed switch is closed and the starting water level can be detected, while when the float tilts downward, the float tilts downward to a set angle. The magnetic part located above and the sliding magnet are in an attracted state, the float is inclined downward by more than the set angle, and the attracted state is released by the action of gravity, whereby the sliding magnet However, it slides downward along the sliding guide shaft in a direction away from the reed switch, and the contact point of the reed switch opens to detect the stop water level. Automatic alternate operation device in the water pump, characterized by that as done obtained.   In the first float switch and the second float switch, an inner peripheral edge portion of the insertion hole of the sliding magnet in an attracted state with the magnetic portion on both side portions in the length direction of the sliding guide shaft An automatic alternating operation apparatus for a submersible pump according to claim 1, wherein engaging circumferential grooves continuous in the circumferential direction are provided, and both end edges of the insertion hole are formed in arcuate protruding edges. The groove width of the engagement circumferential groove is set to be slightly larger than the thickness of the sliding magnet, and the attracting state between the magnetic part and the sliding magnet is temporarily in a state where the float is tilted upward or downward. When released, the sliding magnet is supported at the lower end of the engagement circumferential groove, and the margin of the engagement circumferential groove is sufficient for the magnetic part and the sliding groove. The automatic alternating operation apparatus for submersible pumps according to claim 2, wherein the magnet is set so as to be in an attracted state again.

Images