JP2019015204A - Submersible pump device - Google Patents

Abstract

To provide a submersible pump that can prevent damage to a control unit and shortening of its life.SOLUTION: A submersible pump device comprises: an impeller 10; a casing 13 in which the impeller 10 is housed; a motor 20 for rotating the impeller 10 via a main shaft to which the impeller 10 is fixed; a motor casing 23 in which the motor 20 is housed, and connected to the pump casing 13; a control unit 50 for starting driving of the motor 20 at a predetermined operation start water level 46b, and stopping the driving of the motor 20 at a predetermined operation stop water level 46a lower than the predetermined operation start water level 46b; and a control box 60 in which the control unit 50 is housed. At least a portion of the control box 60 is arranged at a position lower than the operation stop water level 46a.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a submersible pump device.

  The submersible pump device includes a motor unit and a pump unit that transfers liquid by the motor unit. The motor unit includes a motor including a rotor that rotates integrally with a main shaft to which an impeller is fixed, and a stator that is disposed around the rotor.

  A cable for supplying electric power from the power source to the motor is disposed at the upper part of the motor unit. This cable is connected to a control unit for controlling the supply of power to the motor. As described above, since the cable is arranged at the upper part of the motor unit, the control unit is arranged above the motor.

JP-A-9-209971 Japanese Patent Laid-Open No. 10-201168 JP 2001-258196 A JP 2003-74489 A JP 2009-228629 A JP 2015-25367 A Japanese Unexamined Patent Publication No. 2016-48052 Japanese Utility Model Publication No. 61-101691

  However, in such an arrangement, the control unit arranged above the motor may overheat under the influence of heat generated from the motor. Furthermore, the control unit may overheat due to heat generation from itself. As a result, the life of the control unit may be shortened or the control unit may be damaged in a short time.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to provide a submersible pump device that can prevent the control unit from being damaged and shortening its life.

  One aspect includes an impeller, a pump casing in which the impeller is accommodated, a motor that rotates the impeller via a main shaft to which the impeller is fixed, and the motor is accommodated and connected to the pump casing. The motor casing, a control unit that starts driving the motor at a predetermined operation start water level and stops driving the motor at a predetermined operation stop water level lower than the operation start water level, and the control unit are housed. A submersible pump device, wherein at least a part of the control box is disposed at a position lower than the operation stop water level.

In a preferred aspect, the operation stop water level is at the same height as the suction port of the pump casing or at a position higher than the suction port.
In a preferred aspect, at least a part of the control unit is arranged at a position lower than a contact portion of the motor casing with the motor.
In a preferred aspect, the control box includes a box body attached to a side surface of the pump casing or a side surface of the motor casing, and a box cover that covers an opening formed in the box body. , It is fixed to the inner surface of the box body.
In a preferred aspect, the control box includes at least one radiating fin attached to an outer surface thereof.

  Since at least a part of the control box can always be immersed in the liquid, the control unit accommodated in the control box can be cooled. Therefore, overheating of the control unit can be prevented, and failure of the control unit and shortening of its life can be prevented.

It is a schematic sectional drawing which shows one Embodiment of a submersible pump apparatus. It is a figure which shows a control box. It is a figure which shows the cable connected to the upper surface of a box main body. It is drawing for demonstrating the positional relationship of an operation stop water level and a control box. It is drawing for demonstrating the positional relationship of an operation stop water level and a control box. It is drawing for demonstrating the positional relationship of an operation stop water level and a control box. It is drawing for demonstrating the positional relationship of an operation stop water level and a control box. It is drawing for demonstrating the positional relationship of an operation stop water level and a control box. It is drawing for demonstrating the positional relationship of an operation stop water level and a control box. It is a figure which shows other embodiment of a pump apparatus.

  Embodiments of the present invention will be described below with reference to the drawings. Note that, in the drawings described below, the same or corresponding components are denoted by the same reference numerals, and redundant description is omitted.

  FIG. 1 is a schematic sectional view showing an embodiment of the submersible pump device. Hereinafter, the submersible pump device may be simply referred to as a pump device. As shown in FIG. 1, the pump device includes a pump unit 1 and a motor unit 2 disposed adjacent to the pump unit 1. The pump unit 1 is disposed below the motor unit 2. In this embodiment, the pump device is a vertical shaft submersible pump device. The pump device may be used for the transfer (discharge) of sewage. The pump device may be a construction pump device.

  The pump unit 1 includes an impeller 10 and a pump casing 13 in which the impeller 10 is accommodated. The impeller 10 is fixed to a rotary shaft 11 extending in the vertical direction. The motor unit 2 includes a drive shaft 24 to which the rotary shaft 11 is connected, a motor 20 that rotates the impeller 10 via the drive shaft 24 and the rotary shaft 11, and a motor casing 23 in which the motor 20 is accommodated. Yes. The rotating shaft 11 and the drive shaft 24 may be collectively referred to as a main shaft without being distinguished from each other.

  The pump casing 13 includes a first casing (lower casing) 14 in which a suction port 13 a is formed, and a second casing (upper casing or intermediate casing) 15 in which a discharge port 13 b is formed and connected to the first casing 14. I have. A sealing member 16 such as a gasket is disposed between the casings 14 and 15.

  A pump chamber 5 is formed inside the pump casing 13, and the impeller 10 is disposed in the pump chamber 5. When the impeller 10 in the pump casing 13 rotates together with the main shaft, liquid such as water is sucked from the suction port 13a, the pressure of the liquid is increased by the action of the impeller 10 and the pump chamber 5, and the liquid is discharged from the discharge port 13b. Exhaled. In the present embodiment, the suction port 13 a is formed below the impeller 10, and the discharge port 13 b is formed on the side of the impeller 10.

  The motor 20 includes a rotor 26 to which the drive shaft 24 is fixed and a stator 27 that surrounds the rotor 26. The stator 27 includes a stator core 27a and a plurality of coils 27b wound around the stator core 27a. In the present embodiment, the motor 20 extends in parallel with the axial direction of the main shaft. In one embodiment, the motor 20 may be a single phase motor, and in other embodiments, the motor 20 may be a three phase motor.

  The motor casing 23 includes a cylindrical motor frame 30 surrounding the motor 20, a first bracket (lower bracket) 31 connected to one end of the motor frame 30, and a second bracket connected to the other end of the motor frame 30 ( (Upper bracket) 32 and a motor cover 33 disposed on the opposite side of the pump casing 13 with the motor frame 30 interposed therebetween.

  In the present embodiment, the motor frame 30 extends parallel to the axial direction of the main shaft. The stator core 27 a is in contact with the inner surface of the motor frame 30. These brackets 31 and 32 are arranged on both sides of the motor 20. The first bracket 31 is disposed between the pump casing 13 and the motor 20, and the second bracket 32 is disposed between the motor cover 33 and the motor 20. The motor cover 33 is disposed above the second bracket 32.

  A first bearing (lower bearing) 35 is disposed between the main shaft and the first bracket 31, and a second bearing (upper bearing) 36 is disposed between the main shaft and the second bracket 32. These bearings 35 and 36 rotatably support the main shaft.

  The motor casing 23 is liquid-tightly connected to the pump casing 13 via a seal member 39 such as an O-ring or a gasket. Therefore, even if the pump device is submerged in the liquid, the seal member 39 can prevent the liquid from entering between the pump casing 13 and the motor casing 23. A seal member 40 such as an O-ring or a gasket is disposed between the second bracket 32 and the motor cover 33. The seal member 40 can prevent liquid from entering the motor casing 23.

  The pump device according to the present embodiment includes a water level detector 45 that detects the water level in the tank in which the pump device is installed, and a control unit 50 that starts and stops driving of the motor 20 according to the water level signal of the water level detector 45. And.

  The water level detector 45 includes a float switch 46 that can move up and down according to the height of the water level in the tank, and a support 47 that supports the float switch 46 so as to be movable up and down. The float switch 46 includes a switch unit therein and is configured to operate based on the position of the float switch 46. The float switch 46 is connected to the control unit 50 through a switch cable 48. The support column 47 extends in the vertical direction and is connected to the pump unit 1. The support column 47 may be connected to the motor unit 2.

  The float switch 46 detects a predetermined operation stop water level 46a at which the drive of the motor 20 is stopped and a predetermined operation start water level 46b at which the drive of the motor 20 is started. The operation stop water level 46a is lower than the operation start water level 46b. Further, the float switch 46 detects a predetermined abnormal water level 46c. The abnormal water level 46c is higher than the operation start water level 46b.

  The control unit 50 is configured to start driving the motor 20 and stop driving the motor 20 based on the detection signal sent from the water level detector 45. In the present embodiment, the control unit 50 includes a power shut-off device 51 that shuts off the supply of power to the motor 20 based on a detection signal sent from the water level detector 45.

  The power shut-off device 51 may be a mechanical relay or a semiconductor relay. In one embodiment, the control unit 50 may be an inverter for controlling variable speed operation and stop of the motor 20. In other embodiments, the control unit 50 may include a capacitor used for a single-phase motor instead of an inverter. In addition, in FIG. 1, the control unit 50 provided with the power-supply-cutoff apparatus 51 is typically drawn.

  When the water level in the tank rises with the pump device installed in the tank, the float switch 46 rises, and when the water level in the tank reaches the operation start water level 46b, the float switch 46 is turned on. The control unit 50 that has received the ON signal of the float switch 46 starts driving the motor 20. More specifically, power is supplied from the power source to the motor 20 via the power shut-off device 51 of the control unit 50. As a result, the impeller 10 rotates with the main shaft to transfer (discharge) the water in the tank.

  When the water level in the tank is lowered, the float switch 46 is lowered, and when the water level in the tank reaches the operation stop water level 46a, the float switch 46 is turned off. The control unit 50 that has received the off signal of the float switch 46 stops driving the motor 20. More specifically, the power cut-off device 51 cuts off the supply of electric power to the motor 20 by its operation.

  The positions of the operation stop water level 46a, the operation start water level 46b, and the abnormal water level 46c are not limited to the embodiment shown in FIG. In particular, the shutdown water level 46a is determined based on factors such as the environment in which the pump device is installed and the performance of the pump device. The operation stop water level 46a is at the same height as the suction port 13a of the pump casing 13 or at a position higher than the suction port 13a. Details of the position of the shutdown water level 46a will be described later with reference to FIGS.

  In the present embodiment, the water level detector 45 is a float switch type water level detector, but is not particularly limited as long as the water level in the tank can be detected. In one embodiment, the water level detector 45 may be a contact type water level detector such as an electrode type water level detector or a pressure type water level detector. In other embodiments, the water level detector 45 may be a non-contact type water level detector. As an example of the non-contact type water level detector, a laser type water level detector using a laser or an ultrasonic type water level detector using an ultrasonic wave can be cited. When the water level detector 45 is a non-contact type water level detector, the water level detector 45 may be disposed on the ground. The water level detector 45 detects the water level in the tank from the ground and sends a detection signal to the control unit 50.

  The control box 60 that houses the control unit 50 will be described. FIG. 2 is a diagram showing the control box 60. As shown in FIG. 2, the control unit 50 is accommodated in the control box 60. The control box 60 is attached to the second casing 15 and is disposed on the side of the pump casing 13.

  The control box 60 includes a box body 61 attached to the side surface of the pump casing 13 and a box cover 64 that covers the access opening 61 a of the box body 61. The access opening 61a is an opening for allowing an operator to access the control unit 50, and opens in the radial direction of the main shaft, that is, in the horizontal direction. When the box cover 64 is removed, the operator can access the control unit 50 through the access opening 61a.

  The box cover 64 is attached to the box body 61 by a fastener 67 such as a screw. A seal member 68 such as a gasket is disposed between the box cover 64 and the box main body 61. With the seal member 68 disposed between the box cover 64 and the box main body 61, the fastener 67 is disposed. The box cover 64 is liquid-tightly attached to the box body 61 by tightening. The seal member 68 can prevent liquid from entering from between the box body 61 and the box cover 64.

  In the present embodiment, the fastener 67 extends in parallel with the access opening 61a, that is, in the radial direction of the main shaft (more specifically, in the horizontal direction). Therefore, the liquid does not accumulate in the groove formed in the head of the fastener 67, and as a result, corrosion of the fastener 67 due to the liquid can be prevented.

  In the present embodiment, the box body 61 is attached to the side surface 15 a of the second casing 15. More specifically, a part of the side surface 15a of the second casing 15 is provided with a protruding portion 15b that protrudes outward in the radial direction of the main shaft. The box body 61 is attached to the protruding portion 15 b of the second casing 15. A seal member 65 such as a gasket is disposed between the box body 61 and the protruding portion 15 b of the second casing 15. The seal member 65 can prevent liquid from entering from between the second casing 15 and the box body 61. In one embodiment, the box body 61 and the second casing 15 may be integrally formed members.

  A cable (power cable) 70 for supplying power from a power source (not shown) to the motor 20 is connected to the box body 61 via a lead wire 71. A cable opening 61b located above the access opening 61a is formed on the side surface of the box body 61. The cable opening 61b opens in the radial direction of the main shaft, that is, in the horizontal direction.

  The cable 70 is connected to the box body 61 through the cable opening 61b, and closes the cable opening 61b. The number of cables is not limited to this embodiment. In one embodiment, one cable may be connected for direct entry start, and in another embodiment, two cables may be connected for star delta start.

  A seal member 72 such as a gasket is disposed between the cable 70 and the box main body 61. With the seal member 72 disposed between the box main body 61 and the cable 70, a fastener 75 such as a screw. The cable 70 is liquid-tightly connected to the box body 61. The seal member 72 can prevent liquid from entering from between the box body 61 and the cable 70.

  In the present embodiment, the fastener 75 extends in parallel with the cable opening 61b, that is, in the radial direction of the main shaft (more specifically, in the horizontal direction). Therefore, the liquid does not collect in the groove formed in the head of the fastener 75. Therefore, the fastener 75 is not corroded by the liquid, and the cable 70 can be prevented from falling off from the control box 60.

  The box body 61 has a lead wire opening 61c through which the lead wire 71 passes. The lead wire opening 61c faces the cable opening 61b. A lead wire passage hole 80 through which the lead wire 71 passes is formed in the second casing 15. The lead wire passage hole 80 is bent in an L shape and opens at the side surface 15 a (more specifically, the protruding portion 15 b) of the second casing 15 and the upper surface of the second casing 15. In other words, the lead wire passage hole 80 has a side surface side opening of the second casing 15 and an upper surface side opening of the second casing 15.

  The opening on the side surface of the lead wire passage hole 80 is disposed at a position corresponding to the lead wire opening 61c, and the opening on the upper surface side of the lead wire passage hole 80 is located at a position corresponding to the opening 31a formed in the first bracket 31. Is arranged. The first bracket 31 is formed with a through hole through which the main shaft passes, and the opening 31a is disposed adjacent to the through hole.

  A sealing member 82 such as an O-ring is disposed between the upper surface of the second casing 15 and the lower surface of the first bracket 31. This seal member 82 can prevent liquid from entering the lead wire passage hole 80, and furthermore, lubricating oil present in the oil chamber 85 (described later) leaks into the lead wire passage hole 80. Can be prevented. The seal member 82 is disposed on the radially inner side of the seal member 39.

  The lead wire 71 is connected to the control unit 50 in the control box 60 through the cable opening 61b. The lead wire 71 in the control box 60 is further connected to the coil 27b of the motor 20 through the lead wire opening 61c, the lead wire passage hole 80, and the opening 31a of the first bracket 31. For simplification of the drawing, a part of the lead wire 71 is not shown.

  In one embodiment, the cable 70 and the coil 27b of the motor 20 may be connected via a connector. That is, a coil side connector may be provided on the lead wire 71 connected to the coil 27 b and a cable side connector may be provided on the lead wire 71 connected to the cable 70. By connecting these connectors, the cable 70 and the motor 20 can be easily connected, and the cable 70 can be easily detached. Therefore, replacement and maintenance of the motor 20 can be easily performed.

  In order to prevent malfunction or failure of the control unit 50 due to the humidity (moisture) of the air inside the control box 60, a resin such as rubber or plastic may be arranged inside the control box 60. At least some of the elements in the control box 60 are covered with resin. This element includes a control unit 50 and a lead 71.

  In one embodiment, the entire interior of the control box 60 may be filled with resin. In other embodiments, all or part of the lead wire 71 may be covered with resin. The lead wire passage hole 80 may be filled with resin. By covering the lead wire 71 with resin, it is possible to prevent the condensed water generated by the humidity in the control box 60 from contacting the control unit 50 through the lead wire 71. In still another embodiment, all or part of the control unit 50 may be covered with resin.

  Inside the second casing 15 is formed an oil chamber 85 in which lubricating oil is stored and through which the main shaft passes. The oil chamber 85 is disposed adjacent to the lead wire passage hole 80. The oil chamber 85 is provided with a shaft seal device 86 that prevents the liquid sucked into the pump casing 13 from entering the oil chamber 85 and prevents the lubricating oil in the oil chamber 85 from leaking to the outside. Has been. An example of the shaft seal device 86 is a mechanical seal. The illustration of the lubricating oil is omitted. The oil chamber 85 and the lead wire passage hole 80 are completely separated by the seal member 82, and the lubricating oil in the oil chamber 85 does not leak into the lead wire passage hole 80.

  The control box 60 extends from the second casing 15 and extends in a direction away from the motor 20, more specifically, downward. The lower end of the control box 60 is disposed at a position lower than the suction port 13 a of the pump casing 13. The control unit 50 is fixed to the inner surface of the box body 61 and is disposed at a position higher than the suction port 13 a of the pump casing 13.

  A support member 66 that supports the control box 60 may be disposed at the lower end of the control box 60. In one embodiment, the support member 66 is a member separate from the box body 61, and is made of an elastic member such as rubber, for example. In other embodiments, the support member 66 may be configured integrally with the box body 61. Note that the support member 66 is not an essential component and is not necessarily provided.

  FIG. 3 is a diagram showing the cable 70 connected to the upper surface of the box body 61. In the embodiment described above, the cable 70 is connected to the side surface of the box body 61, but in the present embodiment, the cable 70 is connected to the upper surface of the box body 61. In FIG. 3, the cable opening 61b opens in the axial direction of the main shaft, that is, in the vertical direction. According to this embodiment, space saving of a pump apparatus can be achieved.

  The arrangement of the control box 60 will be described. 4 to 9 are diagrams for explaining the positional relationship between the operation stop water level 46a and the control box 60. FIG. 4 to 9, the water level detector 45 is not shown. In the present embodiment, the control box 60 that houses the control unit 50 is not disposed above the motor 20 that is a heating element, but is disposed on the side of the pump casing 13 and at a position lower than the motor 20. Has been. Therefore, the control unit 50 is not affected by the heat generated from the motor 20. According to this embodiment, since the height of the pump device can be reduced, the position of the center of gravity of the pump device can be lowered. Therefore, it is possible to prevent the pump device from falling over more reliably.

  As described above, the control unit 50 may be overheated under the influence of heat generated from itself. Therefore, at least a part of the control box 60 is disposed at the operation stop water level 46a, that is, at a position lower than the position where the float switch 46 detects the operation stop water level 46a. When the water level in the tank drops to the operation stop water level 46a, the control unit 50 stops driving the motor 20 (that is, the power supply to the motor 20 is interrupted by the power shut-off device 51). At least a part of the control box 60 arranged at a position lower than 46a is always immersed in the liquid.

  With such an arrangement, since the control box 60 is cooled by the liquid, the control unit 50 can be indirectly cooled via the control box 60. As a result, overheating of the control unit 50 can be prevented, and failure of the control unit 50 and shortening of its life can be prevented. Not only the control box 60 but also at least a part of the control unit 50 may be arranged at a position lower than the shutdown water level 46a.

  In one embodiment, the control box 60 may include at least one radiating fin (not shown) formed on the outer surface thereof. The number of radiating fins can be arbitrarily determined. The radiating fin is formed on at least one of the box body 61 and the box cover 64. With such a configuration, since the surface area of the control box 60 can be increased, the control unit 50 can be more effectively cooled via the control box 60.

  As shown in FIG. 4, the operation stop water level 46 a may be located at the same height as the suction port 13 a of the pump casing 13. In this case, the support column 47 extends to the same height as the suction port 13a or a position lower than the suction port 13a so that the float switch 46 can be lowered to the shutdown water level 46a. In FIG. 4, a part of the control box 60 is arranged at a position lower than the operation stop water level 46a, and the entire control unit 50 is arranged at a position higher than the operation stop water level 46a.

  As shown in FIG. 5, the operation stop water level 46 a may be located at the same height as the discharge port 13 b of the pump casing 13. In this case, most of the control box 60 is disposed at a position lower than the operation stop water level 46a, and the entire control unit 50 is disposed at a position lower than the operation stop water level 46a.

  As shown in FIG. 6, the operation stop water level 46a may be located at the same height as the lower end of the motor 20 (that is, the first bracket side end of the coil 27b). As shown in FIG. 7, the operation stop water level 46a may be located at the same height as the lower end of the contact portion CS with the motor 20 of the motor casing 23 (more specifically, the motor frame 30). As shown in FIG. 8, the operation stop water level 46a may be located at the same height as the upper end of the contact part CS. In one embodiment, the shutdown water level 46a may be located between the upper end and the lower end of the contact part CS.

  As shown in FIG. 9, the operation stop water level 46a may be located at the same height as the upper end of the motor 20 (that is, the second bracket side end of the coil 27b). In the embodiments shown in FIGS. 6 to 9, the entire control unit 50 and the entire control box 60 are disposed at a position lower than the operation stop water level 46a.

  If the entire control box 60 is at a position higher than the shutdown water level 46a, the following problem may occur. That is, in this case, when the operation of the pump device is stopped, the entire control box 60 is located above the water level in the tank. When the operation of the pump device is started in this state, the control box 60 becomes high temperature due to heat generated by the control unit 50. When the hot control box 60 is immersed in the liquid in the tank, the control box 60 is rapidly cooled.

  As described above, when the temperature of the control box 60 suddenly rises and falls, when the control box 60 is made of metal, the control box 60 is thermally fatigued, and when the control box 60 is made of resin, The control box 60 will deteriorate. In the worst case, the control box 60 may be damaged. Further, due to such a rapid temperature change of the control box 60, condensed water is likely to be generated inside the control box 60, and the control unit 50 may malfunction or break down. In the present embodiment, since at least a part of the control box 60 is always immersed in the liquid, rapid increase and decrease of the temperature of the control box 60 is prevented. Therefore, according to the present embodiment, the above-described problem does not occur.

  The control box 60 may be made of a resin such as polypropylene (PP), or may be made of a metal such as stainless steel. In particular, by configuring the control box 60 from a material having high thermal conductivity such as stainless steel, the control unit 50 can be cooled more effectively. In one embodiment, the box body 61 and the box cover 64 may be made of different materials, and in other embodiments, the box body 61 and the box cover 64 may be made of the same material.

  FIG. 10 is a diagram showing another embodiment of the pump device. In the present embodiment, members that are the same as or correspond to those in the above-described embodiment are assigned the same reference numerals, and redundant descriptions are omitted. As shown in FIG. 10, the box body 61 of the control box 60 is attached to the side surface of the motor casing 23, more specifically, to the side surface 30 a of the motor frame 30. In the present embodiment, the lead wire passage hole 80 and the opening 31a of the first bracket 31 are not provided.

  A frame opening 30b that opens in the radial direction of the main shaft, that is, in the horizontal direction is formed on the side surface 30a of the motor frame 30. The frame opening 30 b is disposed at a position corresponding to the lead wire opening 61 c of the box body 61. In the present embodiment, the frame opening 30b is formed below the contact part CS of the motor frame 30, and the entire control unit 50 and the entire control box 60 are disposed at a position lower than the contact part CS. Yes. In one embodiment, the frame opening 30b may be formed above the contact portion CS of the motor frame 30. A part of the control box 60 may be disposed at a position lower than the contact part CS of the motor frame 30. At least a part of the control unit 50 may be disposed at a position lower than the contact part CS of the motor frame 30.

  The seal member 65 is disposed between the motor frame 30 and the box body 61 and can prevent liquid from entering from between the motor frame 30 and the box body 61. The motor frame 30 and the box body 61 may be integrally formed members.

  The control box 60 projects from the motor frame 30 and extends in a direction away from the motor 20, more specifically, downward. The lower end of the control box 60 is at a position lower than the suction port 13 a of the pump casing 13.

  In one embodiment, the pump device may be a resin pump device in which at least the pump casing 13 and the motor casing 23 are made of resin. In another embodiment, the pump device may be a casting pump device in which at least the pump casing 13 and the motor casing 23 are made of casting.

  In the above-described embodiment, the single pump device including the control box 60 that houses the control unit 50 has been described. However, the pump device may be a combination of a plurality of pump devices. In one embodiment, each of the plurality of pump devices includes a control box 60 that houses the control unit 50, and is an automatic alternating operation type pump device that is automatically operated alternately.

  Although the embodiment of the present invention has been described so far, the present invention is not limited to the above-described embodiment, and it is needless to say that the present invention may be implemented in various different forms within the scope of the technical idea.

DESCRIPTION OF SYMBOLS 1 Pump part 2 Motor part 5 Pump chamber 10 Impeller 11 Rotating shaft 13 Pump casing 13a Suction port 13b Discharge port 14 1st casing 15 2nd casing 15a Side surface 15b Protrusion part 16 Seal member 20 Motor 23 Motor casing 24 Drive shaft 26 Rotor 27 Stator 27a Stator core 27b Coil 30 Motor frame 30a Side surface 30b Frame opening 31 First bracket 31a Open 32 Second bracket 33 Motor cover 35 First bearing 36 Second bearing 39 Seal member 40 Seal member 45 Water level detector 46 Float switch 46a Operation stop water level 46b Operation start water level 46c Abnormal water level 47 Strut 48 Switch cable 50 Control unit 51 Power shut-off device 60 Control box 61 Box body 61a Access opening 61b Cable opening 61c Lead wire opening 64 Box cover 65 Seal member 66 Support member 67 Fastener 68 Seal member 70 Cable 71 Lead wire 72 Seal member 75 Fastener 80 Lead wire passage hole 82 Seal member 85 Oil chamber 86 Shaft seal device

Claims (5)

Impeller,
A pump casing containing the impeller,
A motor for rotating the impeller via a main shaft to which the impeller is fixed;
A motor casing in which the motor is housed and connected to the pump casing;
A control unit that starts driving the motor at a predetermined operation start water level and stops driving the motor at a predetermined operation stop water level lower than the operation start water level;
A control box containing the control unit;
At least a part of the control box is disposed at a position lower than the operation stop water level.   The submersible pump device according to claim 1, wherein the operation stop water level is at the same height as the suction port of the pump casing or at a position higher than the suction port.   3. The submersible pump device according to claim 1, wherein at least a part of the control unit is disposed at a position lower than a contact portion of the motor casing with the motor. The control box is
A box body attached to a side surface of the pump casing or a side surface of the motor casing;
A box cover covering an opening formed in the box body,
The submersible pump device according to any one of claims 1 to 3, wherein the control unit is fixed to an inner surface of the box body.   The submersible pump device according to any one of claims 1 to 4, wherein the control box includes at least one heat radiation fin attached to an outer surface thereof.

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