JP2016135968A - Attaching/detaching device and drainage system - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an attaching/detaching device for a drainage submersible pump and a drainage system that can prevent generation of a clearance between a connection straight pipe and a connection pipe.SOLUTION: A attaching/detaching device 13 for detachably installing a drainage submersible pump 12 in a sewage tank 11 embedded in the ground, includes: a connection pipe 51 connected to discharge piping 25 provided in the sewage tank 11; a connection straight pipe 71 fastened to the drainage submersible pump 12 and water-tightly and detachably connected to the connection pipe 51; a guide pipe 52 extended toward the sewage tank 11; a fixation portion 64 provided on the upper side of an outer peripheral surface of the connection pipe 51 to fix the guide pipe 52; an engagement portion 62 that is provided on the outer peripheral surface of an end of the connection pipe 51 abutting on the connection straight pipe 71 and has a truncated cone-shaped sliding surface 62b inclined to the extending direction of the guide pipe on the side opposite to the abutting end; and an engagement claw 73c that is provided at an end opposing to the connection pipe 51 of the connection straight pipe 71, includes an edge 73e abutting on the sliding surface 62b, having an arcuate shape with 180° or less of a center angle and located on a lower surface 73d and engages with the engagement portion 62.SELECTED DRAWING: Figure 1

Description

  The present invention relates to an attachment / detachment device and a drainage device for attaching / detaching a drainage submersible pump for draining water in a wastewater tank to / from the wastewater tank.

  As one of sewage treatment and the like, a technology is known in which a drainage device is provided as a relay facility for storing and pumping sewage at a relay point of a treatment facility that sends sewage to a treatment facility (see, for example, Patent Document 1). The drainage device includes a sewage tank that stores sewage to a predetermined water level, a drainage submersible pump that pumps the sewage stored in the sewage tank to the secondary side, and an attachment / detachment device that attaches and detaches the drainage submersible pump to the sewage tank. It is equipped with.

  The sewage tank is formed of fiber reinforced resin (FRP) or the like in consideration of, for example, corrosion resistance to sewage, productivity, and strength, and is installed in the ground. The attachment / detachment device attaches / detaches the wastewater pump to / from the connection pipe so that the connection pipe connected to the secondary side of the sewage tank and the discharge pipe of the wastewater pump can be connected. Such a detachable device includes a guide pipe that guides the movement of the drainage pump, a connecting straight pipe that is connected to the discharge pipe and is attached to and detached from the connecting pipe, and an elevating guide part that moves along the guide pipe; It has.

  The raising / lowering guide part is integrally provided in the discharge pipe of the drainage pump. Such a drainage apparatus provides a wire, a chain, etc. to the eyebolt provided in the motor of the drainage submersible pump, and raises / lowers the drainage submersible pump via the wire. Thereby, the raising / lowering guide part moves along a guide pipe, the moving direction of a drainage submersible pump is guided, and a drainage submersible pump is attached or detached with a connection pipe.

  However, the eyebolt provided for raising and lowering the drainage submersible pump is provided substantially at the center of the upper surface of the motor. Moreover, since a discharge pipe is a shape which a discharge pipe protrudes from the outer peripheral surface, it has an asymmetrical shape. For this reason, there is a problem that when the drainage submersible pump is suspended, the drainage submersible pump is inclined and suspended.

  For this reason, the raising / lowering guide part is inclined with respect to the guide pipe, the drainage water pump is moved, and the connecting straight pipe and the connecting pipe are engaged with each other while the connecting straight pipe and the locking fulcrum of the connecting pipe are inclined. There is a possibility that the drainage pump is installed with a gap between the contact surfaces of the pipe and the connecting pipe. When the gap is generated, there arises a problem that sewage discharged by driving the drainage water pump leaks from the gap.

  The leaked water not only causes a decrease in pump efficiency, but also has a risk of dropping the drainage water pump and increasing vibration due to the pressure at the time of leakage. Therefore, a technology (for example, refer to Patent Document 1) in which a connecting straight pipe and a connecting protrusion are provided on the connecting pipe, and a protrusion serving as a locking fulcrum of the connecting straight pipe and the connecting pipe are arranged from the central axis of the connecting pipe. There is also known a technique (see, for example, Patent Document 2) that is arranged below.

Japanese Patent No. 3694140 Japanese Patent No. 3772923

  The drainage apparatus described above has the following problems. That is, when manufacturing a drainage pump or connecting pipe by casting in order to reduce the manufacturing cost, it is difficult to manufacture the protrusion with high dimensional accuracy. As a result, the connection between the connecting straight pipe and the connecting pipe is difficult. There is a possibility that the connecting straight pipe and the connecting pipe are connected in a state where the stop fulcrum is inclined.

  Further, in order to dispose the protrusions serving as locking fulcrums below the central axis of the connecting pipe, it is necessary to provide a pair of the protruding parts in the left-right direction of the connecting pipe. However, since the pair of protrusions are provided apart from each other, it is difficult to provide the height positions and angles of the left and right protrusions with high accuracy. Further, when the drainage pump is lifted, if the drainage pump rotates and tilts around the protrusion, the discharge water pump may be engaged with the discharge pipe, and the movement of the drainage pump may be restricted by the protrusion.

  Then, an object of this invention is to provide the attachment / detachment apparatus and drainage apparatus of the drainage submersible pump which can prevent that a clearance gap produces between a connection straight pipe and a connection pipe.

  In order to solve the above-described problems and achieve the object, the attachment / detachment device and the drainage device of the present invention are configured as follows.

  As one aspect of the present invention, in a detachable apparatus in which a drainage submersible pump is detachably installed in a sewage tank buried in the ground, a connecting pipe connected to a discharge pipe provided in the sewage tank, and the drainage submersible pump A connection straight pipe that is fastened to the connection pipe in a watertight and detachable manner, a guide pipe that extends toward the sewage tank, and an upper portion of the outer peripheral surface of the connection pipe. And a truncated cone that is provided on an outer peripheral surface of an end of the connecting pipe that contacts the connecting straight pipe, and is inclined with respect to the extending direction of the guide pipe on the opposite side of the contacting end. An engaging portion having a sliding surface having a shape and an end portion on an arc having a central angle of 180 ° or less that contacts with the sliding surface are provided on an end portion of the connecting straight tube that contacts the connecting tube. An engaging claw that engages with the engaging portion That.

  As one aspect of the present invention, the drainage device includes a sewage tank buried in the ground, a discharge pipe for discharging the sewage in the sewage tank to the secondary side, a connecting pipe connected to the discharge pipe, and the sewage Guide pipe extended toward the tank, provided on the outer peripheral surface of the connecting pipe, provided on the outer peripheral surface of the fixing part for fixing the guide pipe, and the end of the connecting pipe contacting the connecting straight pipe And an abutting portion having a frustoconical sliding surface inclined with respect to the extending direction of the guide pipe on the opposite side to the abutting end portion, and abutting with the connecting pipe of the connecting straight pipe An attachment / detachment device provided with an engaging claw that engages with the engaging portion that is provided at an end portion and has an edge on a circular arc with a central angle of 180 ° or less contacting the sliding surface on the lower surface, and the connecting pipe A casing in which a connecting straight pipe is connected to be watertight and detachable A pump having an impeller housed in a casing, a rotating shaft for rotating the impeller, a motor frame, a stator provided in the motor frame, and the rotating shaft are fixed and rotated by the stator And a motor having a rotor.

  ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the attachment / detachment device and drainage device of the drainage pump which can prevent that a gap | interval arises between a connection straight pipe and a connection pipe.

The side view which shows the structure of the drainage apparatus which concerns on one Embodiment of this invention in a partial cross section. The side view which shows in part a cross section the structure of the drainage submersible pump and attachment / detachment apparatus which are used for the drainage apparatus. The top view which shows the structure of the drain water pump and attachment / detachment apparatus in a partial cross section. The bottom view which shows the structure of the additional body used for the drainage water pump. Sectional drawing which shows the structure of the connecting pipe used for the attachment / detachment apparatus. The top view which shows the structure of the raising / lowering guide part used for the same attachment / detachment apparatus. Sectional drawing which shows the structure of the raising / lowering guide part. The side view which shows the structure of the raising / lowering guide part. The side view which shows the principal part structure of the wastewater pump which concerns on the modification of this invention in a partial cross section. The bottom view which shows the structure of the additional body of the same wastewater pump.

Hereinafter, the configuration of the drainage device 1 according to an embodiment of the present invention will be described with reference to FIGS. 1 to 8.
FIG. 1 is a side view showing a configuration of a drainage device 1 according to an embodiment of the present invention in a partial cross section, and FIG. 2 is a partial cross section showing configurations of a drainage submersible pump 12 and an attachment / detachment device 13 used in the drainage device 1. FIG. 3 is a top view showing the construction of the wastewater pump 12 and the attachment / detachment device 13 in partial cross section, FIG. 4 is a bottom view showing the construction of the additional body 43 used in the wastewater pump 12, and FIG. 6 is a cross-sectional view showing the structure of the connecting pipe 51 used in FIG. 13, FIG. 6 is a top view showing the structure of the elevating guide part 53 used in the attaching / detaching device 13, and FIG. These are side views which show the structure of the raising / lowering guide part 53. FIG.

  As shown in FIG. 1, the drainage device 1 is installed under the ground 100. The drainage device 1 is provided at a relay point of a drainage facility that sends sewage to a treatment facility. The drainage device 1 includes a sewage tank 11, a drainage water pump 12, and an attachment / detachment device 13. The drainage device 1 is formed so that the sewage in the sewage tank 11 can be supplied to the secondary side by a drainage water pump 12. Here, the ground 100 may be soil, or may be formed of concrete or the like.

  The sewage tank 11 includes a lower sewage tank 21, an upper sewage tank 22, and a lid member 23. The sewage tank 11 includes a suction pipe 24 that draws sewage into the interior thereof from the primary side, and a discharge pipe 25 that is connected to the attachment / detachment device 13 and discharges sewage to the secondary side.

  The sewage tank 11 is configured by, for example, a lower sewage tank 21 and an upper sewage tank 22 being integrally fixed by a fastening member such as a bolt. The lower sewage tank 21 constitutes a bottom surface 21 a and a lower side surface of the sewage tank 11. The lower sewage tank 21 is formed of fiber reinforced resin (FRP). The upper sewage tank 22 constitutes an upper side surface of the sewage tank 11 and an opening 22 a of the sewage tank 11. The upper sewage tank 22 is made of fiber reinforced resin (FRP).

  The lid member 23 is formed so as to be able to close the opening 22 a of the upper sewage tank 22. In such a sewage tank 11, a lower sewage tank 21 and an upper sewage tank 22 are embedded under the ground 100 (under the ground), and an opening 22 a is opened from the ground 100. The sewage tank 11 closes the opening 22a so that the lid member 23 can be attached and detached from the ground 100 (the ground).

  The drainage water pump 12 is formed, for example, so as to be able to supply sewage containing foreign matter to the secondary side. The drainage water pump 12 includes a pump 31, a motor 32, and a rotating shaft 33 provided on the motor 32. Further, the drainage submersible pump 12 includes a float switch that drives and stops the motor 32. The drainage submersible pump 12 has a motor 32 fixed above the pump 31.

  The pump 31 is a so-called sewage pump, and is configured to be able to supply sewage containing foreign matter. The pump 31 includes a casing 41 and an impeller 42 that rotates by driving of the motor 32.

  The casing 41 houses the impeller 42. In the casing 41, a storage chamber 41a for storing the impeller 42 is formed in a volute shape. The casing 41 includes a suction port 41b formed below the discharge port 41b and a discharge pipe 41c that protrudes laterally and forms a discharge port 41d. The discharge pipe 41c includes a flange portion 41e at an end portion constituting the discharge port 41d. In the casing 41, a connecting straight pipe 71 is fastened to an end of the discharge pipe 41c via a flange 41e, and the connecting straight pipe 71 is detachably connected to the attaching / detaching device 13. Moreover, the casing 41 is provided with the additional body 43 provided in the lower surface.

  The impeller 42 is connected to the rotation shaft 33.

  The additional body 43 is a so-called weight. The additional body 43 is fixed to the lower surface of the casing 41 by a fastening member 43a such as a bolt. The additional body 43 is formed so as to be able to correct mass imbalance due to the volute shape of the casing 41 and due to the lifting guide portion 53 fixed to the casing 41. As shown in FIG. 4, when the additional body 43 is attached to the casing 41, the additional body 43 is on the winding start side of the volute shape with respect to the center of the casing 41, and the side on which the lifting guide portion 53 of the casing 41 is provided. Is formed in a disc shape eccentric in the opposite direction. The additional body 43 has an opening 43b that communicates with the suction port 41b. Such an additional body 43 is formed of a material having a large specific gravity such as a metal material.

  The motor 32 includes a motor frame 45, a stator 46 provided in the motor frame 45, and a rotor 47 provided on the stator 46. The motor 32 includes an eyebolt 48 provided at the center of the upper surface of the motor frame 45 and a wire 49 provided on the eyebolt 48.

  The stator 46 is formed so that the rotor 47 can rotate. A rotating shaft 33 is fixed to the rotor 47. The wire 49 extends from the eyebolt 48 to at least the opening 22 a of the sewage tank 11. The wire 49 is formed with such a strength that the drainage submersible pump 12 can be pulled up. The wire 49 may be a chain or the like.

  A plurality of float switches are provided at different heights, and the water level in the sewage tank 11 can be detected by turning the float switch at each position on and off.

  The detachable device 13 includes a connecting pipe 51 to which the discharge pipe 25 is connected, a guide pipe 52 provided on the connecting pipe 51, and a fixing portion 64 that fixes the guide pipe 52. The connecting straight pipe 71 fastened to the discharge pipe 41c of the casing 41 includes an elevating guide portion 53 that is connected to the connecting pipe 51 in a watertight and detachable manner. The attaching / detaching device 13 connects the connecting straight pipe 71 and the discharge pipe 25 in a watertight manner by the connecting pipe 51 and the lifting guide part 53.

  The connecting pipe 51 is a vent pipe that bends 90 degrees from one end side to the other end side. The connecting pipe 51 has a flange portion 61 connected to the discharge pipe 25 at one end portion, with one end portion opening upward.

  The connecting pipe 51 includes an engaging portion 62 that opens in the horizontal direction at the other end and is connected to the lifting guide portion 53 at the end. The connecting pipe 51 includes a leg portion 63 fixed to the bottom surface 21 a of the sewage tank 11 at a lower portion thereof. The connecting pipe 51 includes a fixing portion 64 that fixes the guide pipe 52 on the upper surface adjacent to the engaging portion 62.

  The engaging portion 62 is formed in a shape in which the outer peripheral surface of the connecting pipe 51 protrudes in an annular shape and the ridges between the outer peripheral surface and both side surfaces are inclined. In other words, the engaging portion 62 protrudes in an annular shape, and both side surfaces thereof are formed in a truncated cone shape. Specifically, the engaging portion 62 is provided on the opening end side to which the elevating guide portion 53 is connected, and is provided on the guide surface 62a that is inclined with respect to the vertical direction and on the fixed portion 64 side. And a sliding surface 62b inclined.

  The guide surface 62 a is an annular inclined surface that is inclined with respect to the extending direction of the guide pipe 52. The guide surface 62 a is a relief that avoids interference with the lifting guide portion 53 when the engaging portion 62 engages with the lifting guide portion 53.

  The sliding surface 62 b is an annular inclined surface that is inclined with respect to the extending direction of the guide pipe 52. The sliding surface 62 b is a contact surface on which a part of the lifting guide portion 53 slides when the engaging portion 62 engages with the lifting guide portion 53.

  The fixing portion 64 is formed so that the two guide pipes 52 extend upward and can be fixed. Specifically, the fixed portion 64 includes a support portion 64a formed on the upper portion of the outer peripheral surface of the connecting pipe 51, and a pair of cylindrical members 64b fixed to the support portion 64a. The support part 64a constitutes a flat surface whose upper surface extends in the horizontal direction. The cylindrical member 64b is fixed to the support portion 64a by a fastening member 64c such as a bolt. The cylindrical member 64 b is formed so that a part of the outer diameter thereof is substantially the same as the inner diameter of the guide pipe 52 and can be fitted to the guide pipe 52.

  Two guide pipes 52 are fixed to the fixing portion 64 in parallel. For example, one end of the guide pipe 52 is fixed to the cylindrical member 64 b of the fixing portion 64, and the other end is fixed to a part of the upper sewage tank 22. As the guide pipe 52, for example, a commercially available steel pipe is used.

  The raising / lowering guide part 53 is the connection straight pipe 71 fixed to the discharge pipe 41c, the flange part 72 provided in the one end side of the connection straight pipe 71, and the to-be-engaged provided in the other end side of the connection straight pipe 71. And a pair of guide rollers 74 provided on the engaged portion 73.

  The connecting straight pipe 71 connects the discharge pipe 41c and the connecting pipe 51 in a watertight and detachable manner. The flange portion 72 is positioned at a predetermined position, for example, by a guide pin 75 on the flange portion 41e of the discharge pipe 41c, and is fixed to the flange portion 72 of the discharge pipe 41c by a fastening member. The end face on the other end side of the connecting straight pipe 71 is formed at a slight angle θ, specifically 1 ° with respect to the vertical direction so that the upper part protrudes in the axial direction from the lower part.

  The engaged portion 73 is formed in a bag shape whose inner peripheral surface has a curvature radius substantially the same as the radius of the outer peripheral surface of the engaging portion 62, and is formed so as to be engageable with the engaging portion 62. Specifically, the engaged portion 73 is separated from the first side wall 73a extending upward from the connecting straight pipe 71 by a distance substantially the same as the length of the engaging portion 62 in the axial direction. A second side wall 73b that faces the side wall 73a and a peripheral wall 73c that continues the first side wall 73a and the second side wall 73b are provided.

  The engaged portion 73 is configured by integrally forming the first side wall 73a, the second side wall 73b, and the peripheral wall 73c by casting or the like. 73 has a shaft portion 76 to which a guide roller 74 can be attached on its outer surface.

  For example, the first side wall 73a extends from the upper part of the outer peripheral surface of the connecting straight pipe 71 in the vertical direction. Further, the first side wall 73a is disposed, for example, slightly offset to the flange portion 72 side from the upper end portion of the end surface of the inclined connecting straight pipe 71.

  The second side wall 73b extends in the vertical direction, and its lower surface 73d is formed in an arc shape. The lower surface 73d has an edge portion 73e that comes into contact with the sliding surface 62b when the engaged portion 73 is engaged with the engaging portion 62. The edge 73e is formed to have a radius of curvature that allows line contact with the sliding surface 62b.

  The lower surface 73d (edge 73e) is formed in an arc shape having a central angle of 180 ° or less. The lower surface 73d (edge 73e) is formed in, for example, an arc shape having a central angle of 120 °.

  The peripheral wall 73 c is formed such that the radius of curvature of the inner peripheral surface thereof is substantially the same as the radius of the outer peripheral surface of the engaging portion 62. For example, an eyebolt 77 is fixed to the peripheral wall 73c.

  The guide roller 74 is rotatably provided on a shaft portion 76 provided on the second side wall 73 b of the engaged portion 73. The outer peripheral surface of the guide roller 74 is in contact with the guide pipe 52 and is slidable. The guide roller 74 includes, for example, two frustoconical outer surfaces facing the small diameter side, and a cylindrical outer surface extending in the axial direction connecting the two frustoconical outer surfaces. The shaft portion 76 extends in the horizontal direction.

  A guide roller 74 is detachably attached to the shaft portion 76 and rotatably fixed. The shaft portion 76 extends horizontally from the outer surface of the engaged portion 73 so that when the elevating guide portion 53 is engaged with the connecting pipe 51, the pair of attached guide rollers 74 sandwich the pair of guide pipes 52 from both sides. It extends in the direction. In other words, the pair of guide rollers 74 are formed so as to be able to contact the outer peripheral surfaces of the pair of guide pipes 52 so as to sandwich the pair of guide pipes 52.

  Such an engaged portion 73 constitutes an engaging claw that engages with the engaging portion 62 using the second side wall 73b as a claw portion.

Next, a method for attaching and detaching the wastewater pump 12 configured as described above will be described.
The sewage tank 11 is embedded in the ground integrally with the suction pipe 24 and the discharge pipe 25 in advance, and the leg portion 63 of the connection pipe 51 is fixed to the bottom surface 21a of the sewage tank 11, and the connection pipe 51 is connected to the discharge pipe 25. To do. In addition, a pair of guide pipes 52 are fixed to the fixing part 64 of the connecting pipe 51 and a part of the upper sewage tank 22, and the lifting guide part 53 is fixed to the drain water pump 12.

  Next, the drain water pump 12 is installed in the sewage tank 11. Specifically, a wire 49 is connected to the eyebolt 48 of the motor 32 and the guide roller 74 is engaged with the guide pipe 52. In this state, the wastewater pump 12 is suspended and lowered via the wire 49. At this time, the guide roller 74 rotates to slide with the guide pipe 52, and the drainage pump 12 moves along the guide pipe 52.

  At this time, the wastewater pump 12 is suspended by the eyebolt 48 and the wire 49 of the motor 32. For this reason, the drainage submersible pump 12 moves along the guide pipe 52 in a forward tilt posture in which the elevation guide portion 53 side becomes the center of gravity with respect to the shaft center of the motor 32 and the elevation guide portion 53 side is downward.

  When the wastewater pump 12 is further lowered, the forwardly inclined drainage pump 12 first has both ends of the edge portion 73e of the lower surface 73d of the second side wall 73b of the engaged portion 73 at the sliding surface of the engaging portion 62. 62b abuts. When the wastewater pump 12 is further lowered, both ends of the edge 73e of the lower surface 73d of the engaged portion 73 slide on the sliding surface 62b of the engaging portion 62, and the wastewater pump 12 moves. Thereafter, as the drainage water pump 12 descends, the drainage water pump 12 slightly rotates with the two horizontal points orthogonal to the axial direction of the connection straight pipe 71 as locking fulcrums, and the connection straight pipe The end surface of 71 comes into contact with the end surface of the connecting pipe 51, and the engaged portion 73 engages with the engaging portion 62. Here, the two points of the locking fulcrum are the two points of the edge 73e of the lower surface 73d of the second side wall 73b that contacts the sliding surface 62b.

  Thereby, the drain water pump 12 is fixed to the connection pipe 51. At this time, in the drainage pump 12, the discharge pipe 41c is connected to the discharge pipe 25 in a watertight manner via the connection straight pipe 71 and the connection pipe 51. Further, the edge 73e of the lower surface 73d of the engaged portion 73 comes into contact with the sliding surface 62b by line contact.

  In this way, after the drainage water pump 12 is installed in the sewage tank 11, the wire 49 is fixed to the lid member 23 or the like so that the wire 49 does not fall into the sewage tank 11. Installation of the pump 12 ends.

  Next, removal of the drainage pump 12 during maintenance of the drainage pump 12 will be described.

  First, the drainage pump 12 is lifted through the wire 49 fixed to the lid member 23. At this time, the engagement between the engaging portion 62 and the engaged portion 73 is released. When the drainage water pump 12 is further raised, a rotational moment is applied to the drainage water pump 12 in a forward tilting direction, so that the edge 73e of the lower surface 73d of the second side wall 73b of the engaged portion 73 slides. It slides and rises with the moving surface 62b.

  When the drain water pump 12 is further lifted, the guide roller 74 rotates and slides on the guide pipe 52. As a result, the drain water pump 12 rises along the guide pipe 52. With the guide roller 74 positioned at the upper end of the guide pipe 52, the drain water pump 12 is further lifted so that the guide roller 74 is detached from the guide pipe 52 and the drain water pump 12 can be removed from the sewage tank 11. It becomes possible.

  According to the drainage device 1 configured in this way, the drainage submersible pump 12 can be suspended and installed at a predetermined position by moving the guide roller 74 along the guide pipe 52. Further, the engaged portion 73 of the drainage pump 12 is slid after the sliding surface 62b of the engaging portion 62 and the edge portion 73e of the lower surface 73d of the second side wall 73b are in point contact at two points. It is the structure which contacts.

  For this reason, the movement of the drainage pump 12 is guided by sliding on the sliding surface 62b by the two points that come into point contact with the edge 73e. Thereby, even if the drainage submersible pump 12 descends in the forward inclined posture, the drainage submersible pump 12 is guided by the engaged portion 73 so that the end face of the connecting straight pipe 71 contacts the end face of the connecting pipe 51. Moreover, even if the drainage submersible pump 12 is tilted by rotating to one side around the axial direction of the connecting straight pipe 71 in addition to the forward tilting posture, the drainage submersible pump 12 is similarly driven by the engaged portion 73. Will be guided. As a result, the drainage pump 12 is accurately guided to a predetermined position and fixed to the connecting pipe 51.

  Further, when the drainage water pump 12 is activated, a reaction torque of the rotation is generated by the rotation of the rotor 47 around the axis of the motor 32. However, the engaged portion 73 generates the reaction torque because the edge portion 73e is in line contact with the sliding surface 62b of the engaging portion 62 in a state where the drain water pump 12 is fixed to the connecting pipe 51. However, the edge 73e does not move on the sliding surface 62b. As a result, it is possible to prevent the engagement of the engaged portion 73 and the engaging portion 62 from being caused by driving the drainage submersible pump 12.

  Similarly, even if the drainage submersible pump 12 rotates around the axis of the connecting straight pipe 71, the sliding surface 62b of the engaging portion 62 is formed in an annular shape, and the second portion 73 of the engaged portion 73 is formed. Since the edge 73e of the side wall 73b has an arc shape, the drainage water pump 12 rotates in a state where the edge 73e maintains line contact with the sliding surface 62b. For this reason, the connection of the connection straight pipe 71 and the connection pipe 51 is maintained, and it can be prevented that the end faces of the connection straight pipe 71 and the connection pipe 51 are separated.

  Further, the water pressure when the drainage submersible pump 12 is driven is P, the opening area of the end face of the connecting straight pipe 71 is A, the reaction force due to the water pressure P is R, and the distance from the central axis of the connecting straight pipe 71 to the locking fulcrum is L. When the central angle of the lower surface 73d is 120 °, M is obtained from the following formulas (1) to (3) as a disengagement moment applied to the engaged portion 73 when the drainage pump 12 is driven. Here, the disengagement moment M is a moment applied in a direction in which the engaged portion 73 is disengaged from the engagement portion 62.

R = P × A (1)
sin 30 ° × L≈0.5 × L (2)
M = R (0.5 × L) (3)
Thus, as can be seen from the equation (3), the configuration of the engaged portion 73 makes it possible to reduce the separation moment M to 50%. As a result, it is possible to reduce the separation moment M of the drainage submersible pump 12 attached to the connecting pipe 51, and it is possible to improve the safety when the drainage submersible pump 12 is driven.

  Further, the drainage submersible pump 12 is configured such that the movement is guided by sliding the rotating guide roller 74 on the guide pipe 52. For this reason, dynamic friction when the guide roller 74 slides on the guide pipe 52 is reduced, and the drainage submersible pump 12 can be attached and detached smoothly.

  Further, even if foreign matter contained in the sewage in the sewage tank 11 adheres to the guide roller 74, the guide roller 74 rotates so that the foreign matter is caught between the guide roller 74 and the guide pipe 52. Can be prevented. Even if the biting occurs, the biting can be released by the rotation of the guide roller 74. In particular, since the conventional drainage pump is configured to guide the moving direction only by sliding, the drainage pump 12 of the present embodiment can suppress the occurrence of the biting compared to the conventional pump. .

  Further, even if the guide roller 74 is fixed to the shaft portion 76 due to foreign matter adhering to the guide roller 74, when the drainage water pump 12 is lifted, friction due to sliding between the fixed guide roller 74 and the guide pipe 52 Foreign matter is easily peeled off from the guide roller 74. The guide roller 74 is configured such that a part of the pair of frustoconical outer surfaces abuts the guide pipe 52, and a relatively wide gap is formed between the guide pipe 52 and the guide roller 74. For this reason, even if the foreign matter does not peel from the guide roller 74, it is possible to prevent the foreign matter from being caught between the guide roller 74 and the guide pipe 52 as much as possible. Further, the guide roller 74 adhered to the shaft portion 76 with foreign matter attached can be rotated again by removing the foreign matter during maintenance of the drainage pump 12 even if the foreign matter is not peeled off when the drainage pump 12 is moved. It becomes. Further, since the guide roller 74 is configured to be rotatably fixed to the shaft portion 76, the maintainability is good.

  Further, since a pair of guide rollers 74 is provided and each guide roller 74 is moved along the pair of guide pipes 52, a moment is generated in which the drainage pump 12 rotates around the axis of the connecting straight pipe 71. Even so, the pair of guide rollers 74 can restrict the rotation of the drain water pump 12.

  The fixing portion 64 for fixing the guide pipe 52 includes a support portion 64 a formed on a flat surface and a cylindrical member 64 b fitted to the guide pipe 52. For this reason, even if it is the structure which uses the commercially available steel pipe with comparatively large dimensional tolerance for the guide pipe 52, it becomes possible to extend the guide pipe 52 to a predetermined position in the orthogonal | vertical direction. As a result, the positional relationship between the guide roller 74 and the guide pipe 52 can be arranged with high accuracy, so that the guide roller 74 can be prevented from being detached from the guide pipe 52 when the drainage submersible pump 12 is moved.

  The flange 72 of the connecting straight pipe 71 is positioned at a predetermined position by the guide pin 75 on the flange 41e of the discharge pipe 41c, and is fixed by a fastening member. As a result, the connecting straight pipe 71 is positioned and fixed at a predetermined position of the discharge pipe 41c, so that the pair of guide rollers 74 are arranged in parallel in a direction orthogonal to the axis (vertical direction) of the motor 32. Be placed. As a result, the guide roller 74 can smoothly rotate and move along the guide pipe 52.

  Moreover, since the drainage submersible pump 12 attaches the additional body 43 to the casing 41 and increases the weight of the drainage submersible pump 12, the coupling moment for coupling the connecting straight pipe 71 and the connecting pipe 51 is increased. Is possible. The coupling moment is a moment directed downward of the drainage pump 12 around the locking fulcrum. For this reason, in order to increase the coupling moment, it is not necessary to extend the distance from the casing 41 of the drain water pump 12 to the locking fulcrum, and the drain water pump 12 can be downsized.

  Further, the additional body 43 is formed in a shape that is eccentric from the center of the casing 41 so as to be able to correct the imbalance of the mass of the casing 41 and is attached to the casing 41. For this reason, it is possible to reduce the imbalance of the mass of the pump 31 and approximate the position of the center of gravity of the pump 31 to the center of gravity of the motor 32. As a result, workability is improved when the wastewater pump 12 is suspended and lifted.

  As described above, according to the drainage device 1 according to the embodiment of the present invention, it is possible to prevent a gap from being generated between the connecting pipe 51 and the lifting guide portion 53 that are connected in a watertight and detachable manner. .

  The present invention is not limited to the above embodiment. In the above-described example, the additional body 43 has been described as being formed in a disk shape, but is not limited thereto. For example, as shown in the configuration of the drainage pump 12 using the additional body 43A according to the modification of the present invention shown in FIG. 9 and the configuration of the additional body 43A shown in FIG. If it is possible to reduce mass imbalance, it may be Y-shaped. For example, the additional body 43A is configured to be fixed to the casing 41 by a fastening member 43a such as a bolt and to have an opening 43b.

  Moreover, in the example mentioned above, although the sewage tank 11 was formed with the resin material and demonstrated the structure divided | segmented into the lower sewage tank 21 and the upper sewage tank 22, it is not limited to this. For example, the sewage tank 11 may be made of concrete or the like.

  In the above-described example, the configuration in which the connecting straight pipe 71 of the lifting guide portion 53 is fixed to the discharge pipe 41c of the pump 31 is described, but the present invention is not limited to this. For example, the discharge pipe 41c may not be provided, and the connection straight pipe 71 may be directly fixed to the casing 41 as the discharge pipe. Similarly, the structure which provides the to-be-engaged part 73 integrally in the discharge pipe 41c may be sufficient. In addition, various modifications can be made without departing from the scope of the present invention.

  DESCRIPTION OF SYMBOLS 1 ... Drainage device, 11 ... Sewage tank, 12 ... Drainage water pump, 13 ... Detachable device, 21 ... Lower sewage tank, 21a ... Bottom, 22 ... Upper sewage tank, 22 ... Opening, 23 ... Lid member, 24 ... Suction Pipe, 25 ... Discharge pipe, 31 ... Pump, 32 ... Motor, 33 ... Rotating shaft, 41 ... Casing, 41a ... Storage chamber, 41b ... Suction port, 41c ... Discharge pipe, 41d ... Discharge port, 41e ... Flange part, 42 ... impeller, 43 ... additional body, 43a ... fastening member, 43A ... additional body, 43b ... opening, 45 ... motor frame, 46 ... stator, 47 ... rotor, 48 ... eyebolt, 49 ... wire, 51 ... connecting pipe 52 ... Guide pipe, 53 ... Elevating guide part, 61 ... Flange part, 62 ... Engaging part, 62a ... Guide surface, 62b ... Sliding surface, 63 ... Leg part, 64 ... Fixed part, 64a ... Supporting part, 64b ... Cylinder member, 64c Fastening member, 71 ... Connection straight pipe, 72 ... Flange part, 73 ... Engaged part, 73a ... First side wall, 73b ... Second side wall, 73c ... Peripheral wall, 73d ... Lower surface, 73e ... Edge part, 74 ... Guide roller 75 ... Guide pins, 76 ... Shafts, 77 ... Eye bolts, 100 ... Ground.

Claims (10)

In the detachable device that detachably installs the drainage pump in the sewage tank buried in the ground,
A connecting pipe connected to a discharge pipe provided in the sewage tank;
A connecting straight pipe that is fastened to the drainage water pump and is connected to the connecting pipe in a watertight and detachable manner;
A guide pipe extending toward the sewage tank;
A fixing portion provided at an upper portion of the outer peripheral surface of the connecting pipe, and fixing the guide pipe;
A frustoconical sliding surface that is provided on an outer peripheral surface of an end portion of the connecting pipe that comes into contact with the connecting straight pipe and is inclined with respect to an extending direction of the guide pipe on the opposite side of the contacting end portion; An engaging portion;
Engagement that is provided at an end of the connecting straight pipe that comes into contact with the connecting pipe and that engages with the engaging part that has an edge on a circular arc with a center angle of 180 ° or less on the lower surface. Nails,
An attachment / detachment device comprising: A pair of the guide pipes are provided on the fixed part,
A pair of shaft portions provided on the engaging claws so as to be opposed to the guide pipe;
The attachment / detachment device according to claim 1, further comprising: a pair of guide rollers that are rotatably provided on the shaft portion and slide on the guide pipe.   The attachment / detachment apparatus according to claim 2, wherein the pair of guide rollers are sandwiched from both sides of the pair of guide pipes.   The attachment / detachment device according to claim 2, wherein the fixing portion includes a pair of cylindrical members into which the guide pipe is fitted. The drainage water pump has a casing formed in a volute shape,
The connecting straight pipe is provided in the casing;
The attachment / detachment device according to claim 1, further comprising an additional body that is provided on the casing and corrects an unbalance of the center of gravity of the casing. A sewage tank buried underground,
A discharge pipe for discharging the sewage in the sewage tank to the secondary side;
A pump having a casing to which a connecting straight pipe is fastened and an impeller stored in the casing;
Connected to the discharge pipe and connected to the connecting straight pipe in a watertight and detachable manner, a guide pipe extending toward the sewage tank, provided on the outer peripheral surface of the connecting pipe, A fixing portion for fixing the guide pipe, provided on an outer peripheral surface of an end portion of the connecting pipe that comes into contact with the connecting straight pipe, and inclined with respect to an extending direction of the guide pipe on a side opposite to the contacting end portion And an engaging portion having a frustoconical sliding surface and an end portion of the connecting straight tube that contacts the connecting tube, and a central angle that contacts the sliding surface is an arc of 180 ° or less. A detachable device comprising an engaging claw that engages with the engaging portion having an edge on the lower surface;
A rotating shaft for rotating the impeller;
A motor frame, a stator provided in the motor frame, and a motor having a rotor to which the rotating shaft is fixed and rotated by the stator;
A drainage device comprising: A pair of the guide pipes are provided on the fixed part,
A pair of shaft portions provided on the engaging claws so as to be opposed to the guide pipe;
The drainage device according to claim 6, further comprising: a pair of guide rollers that are rotatably provided on the shaft portion and slide on the guide pipe.   The drainage device according to claim 7, wherein the pair of guide rollers sandwich the pair of guide pipes from both sides.   The drainage device according to claim 7, wherein the fixing portion includes a pair of cylindrical members into which the guide pipe is fitted. The casing is formed in a volute shape,
The connecting straight pipe is provided in the casing;
The drainage device according to claim 6, further comprising an additional body that is provided in the casing and corrects an unbalance of the center of gravity of the casing.