JP2004286020A - Lift station and its method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To make a liquid flow cross over the end 48 of a weir placed much higher than an open channel flow. <P>SOLUTION: A reverse rotation device actively prevents the reverse rotation of a wheel 22, which prevents a blade 40 from being damaged. A motor 58 drives the wheel 22. The motor 58 provided in a housing tray 16 attached to a sidewall 38 drives a driving shaft 66 penetrating the sidewall 38. The housing tray 16 collects arbitrary liquid leaking through the shaft. The housing tray 16 comprises an inclined bottom wall 76 for directing the liquid to a drain hole 78 in the housing sidewall 38. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  As described in Patent Document 1, the present inventor has heretofore provided a device and method for efficiently pumping a liquid from a shallow open channel flow to a higher height. Has been invented.

  The device comprises a rotating wheel (bladed wheel) with flexible blades having straight edges. The rotating wheel rotates in the flow in the same direction as the flow. The rotating wheel sweeps up the liquid from the flow path along the walls of the housing that bends upwards and backwards, and further lifts the liquid over the end of the elevated weir.

European Patent Application Publication No. 11222024

  It is an object of the present invention to ensure improvements to improve the performance of the above-described device.

The improvement includes a steeply descending entryway into the housing that increases the flow rate of the liquid flowing immediately before it collides with the wheel blades (blades). Including adding. This increase in flow velocity, which is large enough, prevents the flow in the flow path from being obstructed. Without such improvements, the flow is likely to decelerate locally and momentarily when it first collides with the wheel blades, resulting in settling of debris (such as chips) and obstruction of the flow. It is.
The housing also includes an upwardly directed flow guide partition (guide partition) that mates with the weir end. The flow guide partition receives the liquid pumped from the blade and guides the liquid over the weir end. This maximizes the percentage of liquid that is scraped up by the wheel blades and exceeds the weir end.

  The improved bearing structure for the wheel support shaft (axle shaft) guarantees a long maintenance-free period even if it is located in the housing, where it comes in contact with liquids and debris.

  An antireverse arrangement provided on a drive shaft connected to the wheel axle (axle shaft) actively prevents unintended reverse rotation of the wheel. If this were not done, the hole blade could be broken or destroyed.

  Wheel blades are composed of two layers of thin metal sheets whose outer edges are sufficiently flexible to flex when impacting large objects in the liquid, while their roots Is hard enough not to deflect too much when pushing the liquid through the housing.

The present invention according to claim 1 is a lift station for pumping a liquid from a flow of a liquid open flow path, wherein the lift station includes:
A housing having an inlet, the inlet being aligned on a bottom wall of the housing to receive the flow of the liquid open channel such that the flow of the open channel continues into the housing. ,
A bladed wheel provided in the housing for rotation about an axis disposed above the inlet, and a drive motor for rotating the bladed wheel, coupled to the bladed wheel by a drive element. Prepare
The bladed wheel has a plurality of outwardly extending blades attached to a hub structure, and the blades have a cross-sectional shape substantially equal to an internal space in the housing that receives the flow of the liquid in the open flow path. The blades fit and rotate in the same direction of the flow, the blades pass through the bottom wall during rotation of the bladed wheel and flow the liquid flow through the open flow path from the inlet. Each having an outer edge scraping in the same direction as the direction of flow of the liquid in the open flow path,
The interior space of the housing is defined by a rear wall that bends upward from the inflow port along a path along which the outer edge of each blade moves, whereby liquid is scraped along by rotation of the bladed wheel. Liquid can be lifted up its path,
The upwardly curved surface extends to a discharge chute that extends rearward and upward, the discharge chute has a weir end defined by an upper region of the discharge chute, and the liquid that is pumped to the weir end is: The lower part of the weir end descends to a collection space located at a place passing the weir end, and the drive motor causes the bladed wheel to scrape the liquid upward while the bladed wheel scrapes the liquid upward. The blade rotates at a blade speed sufficient to throw over the discharge chute and over the weir end, after which the liquid falls into the collection space, and further the open flow due to collision with the blade. In order to prevent a substantial obstruction of the flow of liquid in the channel, a steep inflow channel is provided which is inclined downward with respect to the inlet of the housing bottom wall in the direction of movement of the blade. It is a thing.

  The invention according to claim 2 is characterized in that the housing bottom wall is configured to descend about 3 inches to a point where the flow impinges on the rotating wheel blades. .

  According to a third aspect of the present invention, the housing further extends into the housing from behind the weir end for guiding the liquid thrown up by the wheel blade onto the weir end. It is provided with a guide partition inclined upward.

  According to a fourth aspect of the present invention, the hub structure includes a drum, and the blades extending in a tangential direction are attached around the drum, and the hub structure is fixed to the drum and the drum is mounted on the drum. An axle shaft extending inwardly, and respective bearings provided inside respective side walls formed in the housing for receiving rotation of the bladed wheel in the housing internal space and receiving one end of the axle shaft. It is provided with.

  According to a fifth aspect of the present invention, each of the bearings includes a roller bearing filled with a solid lubricant.

  The invention according to claim 6 is characterized in that the lift station further comprises a counter-rotating device associated with the bladed wheel for power transmission, whereby the direction of flow of the open flow path into the housing is reversed. It is configured to prevent rotation in the direction.

  According to a seventh aspect of the present invention, the reverse rotation device is connected to a one-way sprag clutch driven by a drive shaft driven by the drive motor and a fixed-side structure, and the bladed wheel is reversely rotated. And a reaction arm for reducing the reaction force of the sprag clutch.

  The present invention according to claim 8, wherein each blade is formed of two thin metal plates fastened together, and one blade plate is configured to extend in the radial direction longer than the other blade plate. It is.

According to a ninth aspect of the present invention, in the flow of the open flow path that flows down the inclined bottom collecting gutter extending below the machine tool device, the height of the liquid is raised, whereby the discharged cutting fluid and the mixed chips are removed. Collecting an open channel liquid flow in the collection trough,
Guiding the open channel liquid flow in the collection trough to a housing having a bottom surface configured to receive the liquid flow;
Each of the plurality of blades continuously scrapes the liquid flow, thereby scraping the liquid and chips along the bottom surface of the housing, raising an upwardly curved wall surface, and further reversing the flow of the liquid. Throwing into the discharge chute extending backward in the direction, and at this time over the weir end located at the discharge chute,
A step of dropping the open flow path into a region into which the blade enters, through a vertical head, wherein the vertical head is located upstream of the region where the blade enters the flow. Steps that are sufficient to prevent substantial resistance in the flow.

  The invention according to claim 10 is such that the vertical head has a distance of about 3 inches so as to sufficiently enhance the flow and prevent the upstream resistance.

The present invention according to claim 11 is a lift station for pumping a liquid from a flow of a liquid open flow path, wherein the lift station comprises:
A housing having an inlet, the inlet being aligned on a bottom wall of the housing to receive the flow of the liquid open channel such that the flow of the open channel continues into the housing. ,
A bladed wheel provided in the housing for rotation about an axis disposed above the inlet, and a drive motor for rotating the bladed wheel, coupled to the bladed wheel by a drive element. Prepare
The bladed wheel has a plurality of outwardly extending blades attached to a hub structure, and the blades have a cross-sectional shape substantially equal to an internal space in the housing that receives the flow of the liquid in the open flow path. The blades fit and rotate in the same direction of the flow, the blades pass through the bottom wall during rotation of the bladed wheel and flow the liquid flow through the open flow path from the inlet. Each having an outer edge scraping in the same direction as the direction of flow of the liquid in the open flow path,
The interior space of the housing is defined by a rear wall that bends upward from the inflow port along a path along which the outer edge of each blade moves, whereby liquid is scraped along by rotation of the bladed wheel. Liquid can be lifted up its path,
The upwardly curved surface extends to a rearwardly and upwardly extending discharge chute, the discharge chute having a weir end defined by an upper region of the discharge chute, and the liquid being pumped to the weir end is: The lower part of the weir end descends to a collection space located at a location passing the weir end, and the drive motor drives the bladed wheel so that the bladed wheel scrapes the liquid upward and the liquid The blade is rotated to a blade speed sufficient to throw over the discharge chute and over the weir end, after which the liquid falls into the collection space and further flows into the inlet through the open channel. And a reverse rotation device associated with the power transmission with the bladed wheel for preventing rotation in a direction opposite to the direction of rotation.

The present invention according to claim 12 is a lift station for pumping a liquid from a flow of a liquid open flow path, wherein the lift station comprises:
A housing having an inlet, the inlet being aligned on a bottom wall of the housing to receive the flow of the liquid open channel such that the flow of the open channel continues into the housing. ,
A bladed wheel provided in the housing for rotation about an axis disposed above the inlet, and a drive motor for rotating the bladed wheel, coupled to the bladed wheel by a drive element. Prepare
The bladed wheel has a plurality of outwardly extending blades attached to a hub structure, and the blades have a cross-sectional shape substantially equal to an internal space in the housing that receives the flow of the liquid in the open flow path. The blades fit and rotate in the same direction of the flow, the blades pass through the bottom wall during rotation of the bladed wheel and flow the liquid flow through the open flow path from the inlet. Each having an outer edge scraping in the same direction as the direction of flow of the liquid in the open flow path,
The interior space of the housing is defined by a rear wall that bends upward from the inflow port along a path along which the outer edge of each blade moves, whereby liquid is scraped along by rotation of the bladed wheel. Liquid can be lifted up its path,
The upwardly curved surface extends to a rearwardly and upwardly extending discharge chute, the discharge chute having a weir end defined by an upper region of the discharge chute, and the liquid being pumped to the weir end is: The lower part of the weir end descends to a collection space located at a location passing the weir end, and the drive motor drives the bladed wheel so that the bladed wheel scrapes the liquid upward and the liquid Rotate to a blade speed sufficient to throw over the discharge chute and over the weir end, after which the liquid falls into the collection space and further into a housing tray provided on the side wall of the housing Wherein, within the housing tray, the drive motor couples the bladed wheel to the drive motor to effect the rotation of the wheel. It is provided together with the driving element to be used.

  According to a thirteenth aspect of the present invention, the motor is provided vertically in the housing tray.

  According to a fourteenth aspect of the present invention, the driving element includes a driving shaft penetrating the side wall of the housing.

  According to a fifteenth aspect of the present invention, the housing tray includes an inclined bottom wall inclined toward the housing side wall, and a drain hole in the side wall for returning leaking liquid into the housing tray. is there.

  ADVANTAGE OF THE INVENTION According to this invention, the outstanding effect of improving the performance of a lift station is exhibited.

  In the following detailed description, certain terms are used for clarity and certain embodiments are described. However, it should be understood that they are not intended to be limited to the same and should not be so construed. The invention may take many forms and modifications within the spirit of the claims.

  Referring to FIG. 1, a lift station 10 according to the present invention includes a housing 12 made from a steel plate weldment. The housing 12 includes a wheel housing 14 and a drive element tray housing (housing tray) 16 disposed on one side of the wheel housing 14 at an intermediate height of the wheel housing 14. The housing 12 is supported on a series of leveling legs 18.

  A trough or trench 20 carrying the flow of the open flow channel being pumped is aligned with the inlet end of the housing 12.

  As shown in FIG. 3, a wheel assembly (wheel with blades) 22 is rotatable within a housing section (wheel housing) 14 concentrically with a curved rear wall segment 24.

  The wheel assembly 22 includes a hexagonal drum 26 formed of a series of plates 28 secured to a hub component 30. Wheel assembly 22 is welded to an axle shaft 32. The axle shaft 32 is supported on two bearings 34, 36 provided inside each housing side plate 38 (see FIG. 7). The drum 26, the bearings 34 and 36, the axle shaft 32, and the like form a hub structure.

  A series of six, longitudinally extending, blades 40 having straight edges are provided around the drum 26. Blade 40 extends rearward with respect to rotation of wheel assembly 22 (clockwise as shown in FIG. 3). The blades 40 are fastened to bars 41 that are fixed to angles that are coupled to the plate 28.

  The outer edge of the blade 40 scrapes very closely over the radiused rear wall 24. The blade 40 is formed to have some flexibility so that it can flex in the event of a collision with a large object entrained in the liquid flow. On the other hand, it is hard enough not to bend even if an excessive load due to the weight of the liquid is imposed.

  Two laminated, thin, “blue steel” (about 1.52 cm (0.62 inch) thick) sheets 42, 44 constitute a suitable structure. The longer blade 44 projects radially well beyond the shorter blade 42. As a result, the stiffness near the root of the blade is increased, and excessive bending that adversely affects the performance of the lift station is prevented.

  A rearwardly sloping top wall 46 of the housing guides the liquid swept up by the blades 40 and redirects the liquid back toward a weir end 48 defined at the top of the rear housing wall 52.

  An upwardly sloping partition (guide partition) 50 receives the flushed liquid and facilitates the upwards of the liquid expelled from the wheel blades 40 beyond the weir end 48. Thus, the percentage of liquid that will be scooped up by the blade 40 and will exceed the weir end 48 is increased.

  The bottom deflector 51 redirects the leaked liquid downward and backward so as to return the leaked liquid to the wheel 22 side.

  A downwardly inclined chute plate (discharge chute) 54 opposite the weir end 48 directs the captured liquid to a receiving space (collection space) 56, such as a reservoir or tank of a filtration device. (Represented by phantom lines in FIG. 2).

  Details of operation are set forth in the permitted co-pending application, U.S. patent application Ser. No. 09 / 498,178, filed Feb. 4, 2000, and US Pat. These applications are incorporated herein by reference.

  According to one aspect of the invention, a downwardly sloping inflow channel 56 is provided immediately upstream of where the flow of the liquid open flow channel collides with the rotating wheel blades 40.

  This collision often tends to create an obstruction where the flow of the open channel enters, creating a backwave upstream, and momentarily slows the flow in localized areas. It has been found that as a result, debris settles and creates obstructions in the trenches or chutes along which the flow of the open channel travels. By increasing the flow velocity at the time of inflow by dropping the liquid in the flow path into the inflow path 56, it is possible to compensate for the effect of deceleration caused by collision with the blade, and thereby to be able to avoid the above-mentioned obstacles. I know it.

  A drop of about 3 inches over the entire length of the inflow passage 56 is sufficient to prevent any momentary deceleration upstream of the flow in the open flow path. It is determined.

  The drive system for the bladed wheel 22 includes an electric drive motor 58 having a right-angle gear reducer 60. The drive motor 58 is mounted vertically into the housing tray 16 that is welded to one side of the housing. The right-angle gear reducer / speed reducer 60 is supported on an adjustable mounting 62 in the housing tray 16. The adjustable mount allows the joint 64 and the drive unit output shaft (drive shaft) 66 to be aligned with the wheel axle shaft (axle shaft) (FIG. 4).

  The drive unit output shaft 66 passes through an anti-reverse sprag clutch (one-way sprag clutch) 68. The anti-reverse sprag clutch 68 allows the shaft (drive shaft) 66 to freely rotate in the appropriate direction, but would attempt to rotate in the opposite direction, for example, as a result of the motor 58 being inadvertently wired backwards. Then, it is possible to lock immediately. A reaction arm 70 is coupled to one side of the side plate 38 by a machine screw 72 and a base 74 for reducing a reaction force when locked. The platform 74 is welded to the side plate 38. The anti-reverse sprag clutch 68 and the reaction arm 70 constitute a reverse rotation device.

  This prevents breakage of the wheel blades 40, which would occur if the bladed wheel 22 was rotated in the reverse direction.

  All drive elements are housed in a housing tray section (housing tray) 16. The portion of the shaft (drive shaft) 66 that passes through the side wall 38 is trapped so that any spills passing through the bearing 36 and the shaft (drive shaft) 66 are collected and redirected into the housing section 14. The collection and re-directing is performed by a sloping bottom 76 of the housing tray and a drain hole 78 at the bottom.

  Bearings 34 and 36 are provided within the split bearing housing to prevent leakage. Each split bearing housing includes lower halves 80, 82 that are welded inside each of the side plates 38 of the housing. Top caps 84,86 are secured to each of the housing lower halves 80,82 by cap screws 88.

  As shown at 90 in FIG. 4, the drive unit output shaft 66 is received within the wheel axle shaft and keyed to the wheel axle shaft.

  The bearings 34, 36 are designed to resist the effects of exposure to liquids and machining debris inside the housing.

  McGill Sphere Rol® bearings are preferred. This is because it has a crowning roller for eliminating a minute misalignment between both ends of the shaft 32.

  A solid lubricant, commercially available from Fimet Inc., Springboro, Ohio, under the MICROPOLY trademark, blocks liquids and debris and promotes long bearing life. I know there is.

  The present invention can be applied to, for example, a machine tool device.

FIG. 1 is a side view of the improved lift station apparatus of the present invention, showing a cross section of the flow paths connected by phantom lines. FIG. 2 is a front view of the apparatus shown in FIG. FIG. 3 is a partial sectional view showing details inside the lift station housing. FIG. 4 is a partially enlarged sectional view of the apparatus shown in FIG. FIG. 5 is a plan view of the components shown in FIG. FIG. 6 is a 6-6 sectional view obtained from FIG. FIG. 7 is a front view of the wheel with blades and the support shaft, and additionally shows a pair of shaft bearings provided in the side wall of the housing, partially broken away.

Explanation of reference numerals

12 Housing 16 Housing tray 20 Gutter (collection gutter)
22 Wheel with blade 24 Rear wall 26 Drum 32 Axle shaft 34, 36 Bearing 38 Side wall 40 Blade 48 Weir end 50 Flow guide partition (guide partition)
54 Chute plate (discharge chute)
58 drive motor 66 drive unit output shaft (drive shaft)
68 Anti-reverse sprag clutch (one-way sprag clutch)
70 Reaction arm 76 Inclined bottom wall 78 Drain hole

Claims (15)

A lift station for pumping liquid from the flow of the liquid open flow path, wherein the lift station includes:
A housing having an inlet, the inlet being aligned on a bottom wall of the housing to receive the flow of the liquid open channel such that the flow of the open channel continues into the housing;
A bladed wheel provided in the housing for rotation about an axis disposed above the inlet, and a drive motor for rotating the bladed wheel, coupled to the bladed wheel by a drive element. Prepare
The bladed wheel has a plurality of outwardly extending blades attached to a hub structure, and the blades have a cross-sectional shape substantially equal to an internal space in the housing that receives the flow of the liquid in the open flow path. The blades fit and rotate in the same direction of the flow, the blades pass through the bottom wall during rotation of the bladed wheel and flow the liquid flow through the open flow path from the inlet. Each having an outer edge scraping in the same direction as the direction of flow of the liquid in the open flow path,
The interior space of the housing is defined by a rear wall that bends upward from the inflow port along a path along which the outer edge of each blade moves, whereby liquid is scraped along by rotation of the bladed wheel. Liquid can be lifted up its path,
The upwardly curved surface extends to a rearwardly and upwardly extending discharge chute, the discharge chute having a weir end defined by an upper region of the discharge chute, and the liquid being pumped to the weir end is: The lower part of the weir end descends to a collection space located at a location passing the weir end, and the drive motor drives the bladed wheel so that the bladed wheel scrapes the liquid upward and the liquid The blade rotates at a blade speed sufficient to throw over the discharge chute and over the weir end, after which the liquid falls into the collection space, and further the open flow due to collision with the blade. In order to prevent a substantial obstruction of the flow of liquid in the channel, a steep inflow channel is provided which is inclined downward with respect to the inlet of the housing bottom wall in the direction of movement of the blade. Lift station characterized by the following.   The lift station of claim 1, wherein the housing bottom wall is configured to descend about 3 inches to a point where the flow impinges on the rotating wheel blades.   The housing further comprises an upwardly sloping guide partition extending into the housing from behind the weir end for guiding the liquid pumped by the wheel blades over the weir end. The lift station according to claim 1.   The hub structure includes a drum, and the tangentially extending blade is attached to a periphery of the drum. The hub structure further includes an axle shaft fixed to the drum and extending into the drum; 2. A bearing according to claim 1, further comprising bearings provided inside respective side walls formed in said housing and for receiving one end of said axle shaft, for supporting rotation of said wheel in said housing internal space. Lift station.   5. The lift station according to claim 4, wherein each of said bearings comprises a roller bearing filled with a solid lubricant.   The lift station further comprises a counter-rotating device associated with the bladed wheel in terms of power transmission, thereby preventing rotation of the open flow path into the housing in a direction opposite to the direction of flow. The lift station of claim 1, wherein the lift station is configured.   The reverse rotation device is connected to a one-way sprag clutch driven by a drive shaft driven by the drive motor, and is connected to a fixed-side structure. The lift station according to claim 6, further comprising a reaction arm for reducing a reaction force.   2. The lift station of claim 1, wherein each blade is comprised of two thin metal plates fastened together, one blade plate configured to extend radially longer than the other blade plate. In the flow of the open channel that flows down the inclined bottom collecting gutter extending below the machine tool device, the height of the liquid is raised, thereby collecting the discharged cutting fluid and mixed chips and opening the collecting gutter. A method of forming a flow channel liquid flow, comprising:
Guiding the open channel liquid flow in the collection trough to a housing having a bottom surface configured to receive the liquid flow;
Each of the plurality of blades continuously scrapes the liquid flow, thereby scraping the liquid and chips along the bottom surface of the housing, raising an upwardly curved wall surface, and further reversing the flow of the liquid. Throwing into the discharge chute extending backward in the direction, and at this time over the weir end located at the discharge chute,
A step of dropping the open flow path into a region into which the blade enters, through a vertical head, wherein the vertical head is located upstream of the region where the blade enters the flow. The steps being sufficient to prevent substantial resistance in flow.   10. The method of claim 9, wherein said vertical head comprises a distance of about 3 inches to sufficiently enhance flow and prevent said upstream resistance. A lift station for pumping liquid from the flow of the liquid open flow path, wherein the lift station includes:
A housing having an inlet, the inlet being aligned on a bottom wall of the housing to receive the flow of the liquid open channel such that the flow of the open channel continues into the housing. ,
A bladed wheel provided in the housing for rotation about an axis disposed above the inlet, and a drive motor for rotating the bladed wheel, coupled to the bladed wheel by a drive element. Prepare
The bladed wheel has a plurality of outwardly extending blades attached to a hub structure, and the blades have a cross-sectional shape substantially equal to an internal space in the housing that receives the flow of the liquid in the open flow path. The blades fit and rotate in the same direction of the flow, the blades pass through the bottom wall during rotation of the bladed wheel and flow the liquid flow through the open flow path from the inlet. Each having an outer edge scraping in the same direction as the direction of flow of the liquid in the open flow path,
The interior space of the housing is defined by a rear wall that bends upward from the inflow port along a path along which the outer edge of each blade moves, whereby liquid is scraped along by rotation of the bladed wheel. Liquid can be lifted up its path,
The upwardly curved surface extends to a rearwardly and upwardly extending discharge chute, the discharge chute having a weir end defined by an upper region of the discharge chute, and the liquid being pumped to the weir end is: The lower part of the weir end descends to a collection space located at a location passing the weir end, and the drive motor drives the bladed wheel so that the bladed wheel scrapes the liquid upward and the liquid The blade is rotated to a blade speed sufficient to throw over the discharge chute and over the weir end, after which the liquid falls into the collection space and further flows into the inlet through the open channel. A lift station comprising a counter-rotating device associated with the bladed wheel for power transmission to prevent rotation in a direction opposite to the direction of rotation. A lift station for pumping liquid from the flow of the liquid open flow path, wherein the lift station includes:
A housing having an inlet, the inlet being aligned on a bottom wall of the housing to receive the flow of the liquid open channel such that the flow of the open channel continues into the housing. ,
A bladed wheel provided in the housing for rotation about an axis disposed above the inlet, and a drive motor for rotating the bladed wheel, coupled to the bladed wheel by a drive element. Prepare
The bladed wheel has a plurality of outwardly extending blades attached to a hub structure, and the blades have a cross-sectional shape substantially equal to an internal space in the housing that receives the flow of the liquid in the open flow path. The blades fit and rotate in the same direction of the flow, the blades pass through the bottom wall during rotation of the bladed wheel and flow the liquid flow through the open flow path from the inlet. Each having an outer edge scraping in the same direction as the direction of flow of the liquid in the open flow path,
The interior space of the housing is defined by a rear wall that bends upward from the inflow port along a path along which the outer edge of each blade moves, whereby liquid is scraped along by rotation of the bladed wheel. Liquid can be lifted up its path,
The upwardly curved surface extends to a rearwardly and upwardly extending discharge chute, the discharge chute having a weir end defined by an upper region of the discharge chute, and the liquid being pumped to the weir end is: The lower part of the weir end descends to a collection space located at a location passing the weir end, and the drive motor drives the bladed wheel so that the bladed wheel scrapes the liquid upward and the liquid Rotate to a blade speed sufficient to throw over the discharge chute and over the weir end, after which the liquid falls into the collection space and further into a housing tray provided on the side wall of the housing Wherein, within the housing tray, the drive motor couples the bladed wheel to the drive motor to effect the rotation of the wheel. A lift station provided with a driving element to be driven.   13. The lift station of claim 12, wherein said motor is mounted vertically within said housing tray.   The lift station of claim 12, wherein the drive element comprises a drive shaft extending through the side wall of the housing. 15. The lift station of claim 14, wherein the housing tray includes a sloped bottom wall inclined toward the housing side wall and a drain hole in the side wall for returning leaking liquid into the housing tray.

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