Hybrid radial axial cutter

One or more techniques and/or systems are disclosed for a cutter/grinder system that can be engaged with a pump. The cutter/grinder system can comprise an axial cutting operation and a radial cutting operation, comprising a rotary cutter that has both radial and axial cutting edges. The rotating cutter can be operably engaged with a stationary cutter apparatus, non-movably engaged with a pump, where the stationary cutter apparatus comprises both an axial cutting operation and a radial cutting operation, comprising both radial and axial cutting edges. The system can facilitate reduction of a size of solids that may be entrained in a target fluid.

BACKGROUND

A cutter/grinder pump system is used as a wastewater conveyance system that has the ability to reduce the size of solid matter that may be entrained in the target fluid. Waste from water-using systems in commercial and household settings, such as appliances (e.g., toilets, bathtubs, washing machines, etc.) and other components, can be transported to a holding tank in which the grinder pump is disposed. Upon activation, the pump can be used to cut and/or grind the solids entrained fluid waste into a fine slurry, and pump it to a treatment system handling conduit (e.g., central processing or septic system). A grinder pump and cutter pump are different from a typical effluent pump in that a cutter or grinder assembly is installed that reduces solids prior to entry into the pump.

SUMMARY

As provided herein, cutter/grinder system that can be engaged with a pump to facilitate reduction of solids that may be entrained in a target fluid. An example cutter/grinder system may cut and/or grind solid matter such that the reduced sized matter can be converted in a more efficient and effective manner, for example, by using less energy to provide similar performance as a higher energy consuming system. For example, an exemplary cutter/grinder system may utilize both an axial cutting operation and a radial cutting operation, comprising a rotary cutter system that has both radial and axial cutting edges.

In one implementation, a cutter system for a pump can comprise a stationary cutter plate configured to operably couple with a pump in a stationary disposition at an intake area of the pump. The stationary cutter plate can comprise a plurality of intake ports respectively comprising a stationary cutting edge. Intake ports can comprise a first set of intake ports disposed around a perimeter portion of the stationary cutter plate; and a second set of intake ports disposed at an interior portion of the stationary cutter plate. Further, the cutter system can comprise a stationary cutter wall fixedly engaged with the stationary cutter plate in a substantially transverse direction from the perimeter of the intake side of the stationary cutter plate. The stationary cutter wall can comprise a wall cutting edge disposed in substantial alignment with the respective first set of intake ports. Additionally, the stationary cutter plate can comprise a rotating cutter configured to operably couple with a rotating shaft of the pump. The rotating cutter can comprise a plurality of cutting arms projecting radially from a central hub portion of the rotating cutter, an axial cutting edge disposed on respective cutting arms substantially parallel to the intake surface of the stationary cutter plate, and a radial cutting edge disposed on a distal end of respective cutting arms substantially parallel to an interior side of the stationary cutter wall.

DETAILED DESCRIPTION

A cutter/grinder system may be devised that can be operably coupled with a fluids pump to facilitate degradation of solids, in order to improve pumping of fluids that may comprise entrained solids. That is, for example, an example cutter/grinder system, described herein, may cut and/or grind solid matter mixed with the fluid to a smaller size, such that the reduced-sized matter can be effectively pumped with the fluid. Further, an example cutter/grinder system, described herein, may perform such cutting/grinding in a more efficient and effective manner than previously available systems, for example, by using less energy to provide similar performance as a higher energy consuming system. In one implementation, the exemplary cutter/grinder system may utilize an axial cutting operation and a radial cutting operation. As an example, the system can comprise a rotary cutter that has both radial and axial cutting edges, and a stationary cutting portion that has both radial and axial cutting edges. In this example, rotation of the rotary cutter allows its radial and axial cutting edges to operably engage with the corresponding radial and axial cutting edges of the stationary cutter. In this way, an improved solids size reduction may be obtained.

In one aspect, a radial portion of the hybrid cutter/grinder system can be used to grind solids found in typical wastewater into a fine slurry, which may be preferable to help with downstream pumping and flow, and to reduce equipment maintenance issues. Further, in this aspect, an axial portion of the hybrid cutter/grinder system can be used to cut stringy solids and other forms of non-human waste in to pieces small enough to pass through a small diameter discharge pipe, which may be smaller than those found in systems without a cutter/grinder pump, for example. As an example, it may be the small diameter (e.g., typically one and one quarter inches) of the downstream pipe that gives the grinder pump its up-front capital cost advantages over a typical gravity and large pump lift station. In this aspect, in one implementation, the combination of the radial and axial portions in the hybrid cutter/grinder system may provide for the preferred particle size to produce a desired slurry of solids, while reducing the size of stringy solids without the typical clogging issues that often accompany them.

FIGS. 1-4are component diagrams illustrating various views of an example implementation of a cutter/grinder system100, as described herein. In this implementation, the cutter/grinder system100can comprise a stationary cutter102and a movable cutter104. The stationary cutter102can comprise a perimeter wall106and a base plate108. In some implementations, the perimeter wall106and base plate108may be integral (e.g., integrally formed), may be fixedly engaged (e.g., fastened together), or may be selectably coupled (e.g., to each other, or separately to a pump). Further, the perimeter wall106can extend in a transverse direction from the base plate108, around the perimeter of the base plate108. In this implementation, the movable cutter104can comprise a plurality of radial arms110and a hub portion112, from which the radial arms110extend radially.

In one implementation, the movable cutter104can be configured to rotate within a space formed by the perimeter wall106and base plate108. In this implementation, the rotating movable cutter104can provide a cutting and/or grinding action in combination with a stationary cutter, for example, providing a radial cutting and/or grinding action where the perimeter wall106and radial end of the radial arms110interact; and an axial cutting and/or grinding action where the base plate108and leading edge of the radial arms110interact. That is, for example, the exemplary system100may provide both a radial and axial cutting/grinding action for solids entrained in a fluid.

With continued reference toFIGS. 1-4,FIGS. 5-7are component diagrams illustrating various views of a portion of the cutter/grinder system100, as described herein. In this implementation, the stationary cutter102can comprise a first set of intake ports114(e.g., perimeter intake ports) disposed around the perimeter of the stationary cutter's base plate108. Further, the stationary cutter102can comprise a second set of intake ports116(e.g., interior intake ports) disposed at an interior portion of the base plate108. In one implementation, the stationary cutter102can be disposed at an intake portion of a pump, such as a wastewater pump. In this implementation, the first set of intake ports114and/or the second set of intake ports116can be configured to be conduits for fluid (e.g., wastewater) pumped into the pumping system.

Further, at least a portion of the respective intake ports from the second set of intake ports116can comprise a base intake port cutting edge526that is configured to provide a stationary, axial cutting edge on the base102. For example, in combination with a rotating cutting arm (e.g.,110ofFIG. 1), the base intake port cutting edge526can provide a shearing, scissor-like cutting action on solid material that may be drawn to the intake port116. That is, for example, the pump may draw the fluid comprising the solid matter toward its intake area, and at least a portion of the solids may enter one or more of the interior intake ports116. In this example, the rotating cutting arm can create a shearing action with the base intake port cutting edge526to cut, chop, and/or grind the solid matter into a smaller size so that it can more easily enter the interior intake ports116, and be less likely to create clogging issues.

In one implementation, as illustrated inFIGS. 4 and 6, the respective interior intake ports116may comprise a frustoconical shape, for example, where the top of the frustum shape is disposed on the intake side of the base plate108, and the bottom of the frustum is disposed at the outlet side of the base plate108. As an example, having the top of the frustum disposed at the site of the intake port cutting edge526may provide a more acute cutting edge angle. In this way, for example, the intake port cutting edge526may provide an improved cutting edge, while the larger diameter of the outlet side of the frustum provides for improved fluid flow (e.g., comprising solids).

Additionally, a perimeter wall of the stationary cutter102can comprise an inside portion522(e.g., interior side of wall). In one implementation, the inside portion of the wall522can comprise a radial cutting edge524(e.g., cutting edge of perimeter intake port) at the respective first set of intake ports114. In this implementation, respective radial cutting edges524can be disposed orthogonally from the base plate108. For example, in this orientation (e.g., parallel to the wall, or transverse from the surface of the base plate108) they can create a radial cutting surface. In this example, in combination with a terminal end of a rotating cutting arm, the radial cutting edge524may provide a second shearing, scissor-like cutting action on solid material that is drawn to the intake port114, or may migrate to the inside portion of the wall522through centrifugal force provided by the rotating cutting arm. That is, for example, the pump may draw the fluid with solid matter toward its intake area, and at least a portion of the solids may enter one or more of the perimeter intake ports114. In this example, the terminal end of the rotating cutting arm can create a shearing action with the wall intake port cutting edge524to cut, chop, and/or grind the solid matter into a smaller size.

As illustrated inFIGS. 5-7, the example stationary cutter102can comprise one or more channels528, disposed on the intake side of the base plate108. In one implementation, a channel528can be configured to facilitate translation of fluid and/or solids from a central area (e.g., the hub portion112) toward the inside portion of the wall522. Further, in one implementation, a channel may be disposed between the hub portion112and the inside portion of the wall522, such as leading to respective perimeter intake ports114. Additionally, one or more interior intake ports116may be disposed along a channel528. In this implementation, a channel leading from an interior intake port116may facilitate movement of sheared solids toward inside portion of the wall522. In one implementation, one or more or the channels may terminate at a perimeter intake port114. In this way, for example, solids that are translated along a channel528toward the perimeter intake port114may be subjected to the radial shearing action of the radial cutting edge524combined with the terminal end of a rotating cutting arm. In one implementation, a direction, length and design of the respective channels528may be determined based on use conditions of the cutter/grinder system100, for example, a speed of the rotating arms, size of solids, expected head pressure, pipe diameters, fluid characteristics, and other conditions.

In one implementation, the example stationary cutter102can comprise one or more sub-planar cut-outs530, disposed on an intake side of the perimeter wall106. In this implementation, the respective sub-planar cut-outs530may be configured to mitigate clogging of the cutter/grinder system100, and/or to improve flow of a fluid comprising solids through the intake ports114,116. Further, in one implementation, the location and size of the sub-planar cut-outs530may provide improved solids shearing/grinding action results. As an example, a size, location, number and depth of a sub-planar cut-outs530may vary, depending on the expected application (amount and type of solids, type of fluid, pipe size, head pressure, etc.). In one implementation, as illustrated inFIGS. 5-7, a sub-planar cut-out530may be disposed at a location of one or more perimeter intake ports114, on the intake side of the perimeter wall.

With continued reference toFIGS. 1-7,FIGS. 8-12are component diagrams illustrating various views of a portion of the cutter/grinder system100, as described herein. In this implementation, the movable cutter104can comprise keyway832that is configured to selectably engage with a corresponding key coupled with the shaft of a pump. As an example, the shaft of a pump may comprise a key that is configured (e.g., in shape and size) to slidably engage with the keyway832at the cutter hub112. In this way, in this example, a rotation of the shaft may result in a rotation of the movable cutter, such as during pump operation.

In one implementation, the movable cutter104can comprise a first cutting edge834, comprising an axial cutter (e.g., a leading cutting edge), disposed on one or more of the cutter arms110. The first cutting edge834can be configured to engage with solid matter, for example, in combination with the base axial cutting edge526, in order to reduce the size of the solid matter. As an example, in combination with the base intake port cutting edge526, the first cutting edge834of the cutter arm110, can provide a shearing, scissor-like cutting action on solid material that may be drawn to the intake port116of the base plate108of the stationary cutter102. That is, for example, the pump may draw the fluid comprising the solid matter toward its intake area, and at least a portion of the solids may enter one or more of the interior intake ports116of the base plate108. In this example, the first cutting edge834can create a cutting or shearing action with the base intake port cutting edge526to cut, chop, and/or grind the solid matter into a smaller size so that it can more easily enter the interior intake ports116and be less likely to create clogging issues for the pump.

In one implementation, the first cutting edge834can comprise serrations838. As an example, a serrated cutting edge can comprise a plurality of smaller points of contact with the solid matter subjected to the shearing action. For example, having a smaller contact area at any one time, than a straight edge, allows the applied pressure at each point of contact to impart a greater force to the subject matter. Further, the curved nature of the serrated edges838can provide a sharper angle to the material being cut. This may result in an improved shearing action in conjunction with the curved shaped of the base intake port cutting edge526, for example, particularly as the cutter arm110rotates around the base plate108. That is, for example, as the cutter arm110rotates, a first portion of a serration838may contact a solid engaged with the base intake port116. In this example, as the cutter arm continues to rotate, the different portions of the serration838contact the solid at different angles. Additionally, as the cutter arm110rotates, the serration838can traverse the base intake port116, providing improved shearing action in conjunction with the base intake port cutting edge526. This type of action may improve cutting/grinding performance of the example grinder/cutter assembly100.

In one implementation, the movable cutter104can comprise a second cutting edge836, comprising a radial cutter, disposed on a distal end of one or more of the cutter arms110. The second cutting edge836can be configured to engage with solid matter, for example, in combination with the wall intake port cutting edge524(e.g., base radial cutting edge), in order to reduce the size of the solid matter. As an example, in combination with wall intake port cutting edge524, the second (e.g., radial) cutting edge836of the cutter arm110, can provide a shearing, scissor-like cutting action on solid material that may be drawn to the perimeter intake port114of the base plate108(e.g., and wall106) of the stationary cutter102. That is, for example, the pump may draw the fluid comprising the solid matter toward its intake area and at least a portion of the solids may enter one or more of the perimeter intake ports114of the base plate108, or be translated toward them by the rotating action of the cutter arms110. In this example, the second cutting edge836can create a shearing action with the wall intake port cutting edge524to cut, chop, and/or grind the solid matter into a smaller size so that it can more easily enter the perimeter intake ports114and be less likely to create clogging issues for the pump.

In one or more implementations, the second (e.g., radial) cutting edge836can comprise varying sizes, and/or shapes; and may be disposed on one or more of the cutting arms110. As an illustrative example, as illustrated inFIGS. 8-12, a second cutting edge836may comprise a first size and shape836a(e.g., long and narrow), a second size and shape836b(e.g., medium length and thick), and a size length and shape836c(e.g., short and medium width) (e.g., and a fourth, etc.). Further, in one implementation, the second cutting edge836can be disposed at various portions of the distal end of the cutter arm110, and/or at different cutting angles, as illustrated. For example, a radial cutting edge can comprise a first cutting angles, and a second, different cutting angle (e.g., and a third, and a fourth, etc.). In this way, in this example, engaged solids may be operated upon from different angles to provide a more effective cutting/shearing action.

As an illustrative example, as illustrated inFIG. 12, second cutting edge836ais disposed such that a top portion of the second cutting edge836acan interact with higher portions of the perimeter wall106(e.g., and therefore higher portions of a wall cutting edge524). In this example, a second cutting edge836cis disposed at a lower position on the distal end of the cutter arm110(e.g., and at a different cutting angle), which may allow it to interact with lower portions of the perimeter wall106(e.g., and therefore lower portions of a wall cutting edge524). Additionally, a second cutting edge836b, inFIG. 9, is disposed at a middle position on the distal end of the cutter arm110, which may allow it to interact with middle portions of the perimeter wall106. In this way, for example, having varied second cutting edge836positions may provide for a more effective cutting/grinding of solid matter, such as by impacting the matter at various locations (e.g., and at different cutting angles) during movable cutter104rotation.

As illustrated inFIGS. 8-12, in one implementation, a cutter arm110of the movable cutter104can comprise a trailing edge840and a relief portion of the trailing edge1046(e.g., inFIGS. 10 and 11). A shape, size and/or angle of disposition of the trailing edge840can be configured to mitigate a cavitation effect that may result from the movable cutter104rotating through a fluid. Further, in one implementation, the relief portion of the trailing edge1046may also be configured to mitigate a cavitation effect. That is, for example, a lower pressure may form behind the cutter arm110as it moves through the fluid (e.g., at the trailing side of the cutter arm). In this example, the lower pressure can allow fluid cavitation to occur, which may result in damage to the material (e.g., metal) forming the cutter arm110. In this implementation, a transition with a fillet, comprising a desired size, transition angle, and/or shape, can help mitigate separation of the fluid, thereby mitigating creation of a vacuum behind the cutter arm110. The size of the relief portion of the trailing edge1046may also facilitate in reducing the separation of fluid.

Additionally, the relief portion of the trailing edge1046can be configured to reduce potential contact area between the axial cutter edge834of the cutter arm110and the base plate108. As an example, clearances between the axial cutter edge834and the base plate108can be reduced to accommodate a desired solids reduction performance level. In this example, the relief portion of the trailing edge1046can facilitate in creating a reduced axial cutter edge834footprint, which may come into contact with the surface of the base plate108during operation. In this way, for example, a reduction in potential friction may result, allowing the cutter/grinder assembly100to perform more efficiently on a pump. Further, the relief portion of the trailing edge1046can be used to reduce the amount of material used to manufacture the movable cutter104, for example, making it easier to manufacture, lighter, and more efficient.

As illustrated inFIGS. 2, 8, 9 and 12, in one implementation, the movable cutter104can comprise a slinger component220. A slinger220can be disposed on one or more cutter arms110, at the distal portion. The slinger220can be configured to engage with larger solids, and/or flexible solids (e.g., cloth, cloth-like material, plastics, string, etc.) and transition them away from the path of the inlet. As an example, larger solids and flexible solids can cause clogs in the cutter assembly100and/or may wrap around the movable cutter104, reducing the ability of the cutter assembly100to perform appropriately. In one example, the slinger220can catch flexible solids and sling them away from the intake area of the pump, before they become entangled with the cutter assembly100. In this way, portions of these type of solids may be moved away from the cutter assembly continually, for example, until they have been reduced in size to a point where they may be drawn though the intake ports114,116.

As illustrated inFIGS. 9, 10 and 12, in one implementation, the movable cutter104can comprise a weighting component942. Further, in one implementation, as illustrated inFIGS. 10 and 11, the movable cutter104can comprise a cutout portion1044. The weighting component942and/or the cutout portion1044may be configured to facilitate weight distribution for the movable cutter104. As an example, a slinger220disposed at the distal end of a cutter arm110may result in weight displacement of the movable cutter104distributed outward from the hub area112toward the location of the slinger220. In this example, a weight distribution that extends out from the hub area112may result in an undesirable operation, such as wobbling during rotation, and/or additional forces causing stress on the portions of the cutter subjected to the additional weight (e.g., the cutter arm110comprising the slinger220). That is, for example, having the center of weight distribution as close the center of the hub area112as achievable can provide for smoother operation of the movable cutter104. In this example, this distribution can result in mitigated chances of damage to portions of the movable cutter104through additional stresses. Further, the distribution may provide for prolonged life for a bearing associated with the shaft of the pump, and can generally increase the mean time between repairs on the system, and/or pump.

In one implementation, the cutout portion1044can be disposed on a bottom portion of the distal portion of the cutter arm110on which the slinger220is disposed. As illustrated inFIGS. 10 and 11, the cutout portion1044may be sized and/or shaped in accordance with sound engineering practices to accommodate the desired weight distribution for the intended uses of the movable cutter104. That is, for example, an amount of material removed from the cutter arm110by the cutout portion1044may provide a reduction in weight on the cutter arm110on which the slinger220is disposed. Further, as illustrated inFIGS. 9, 10 and 12, the weighting component942can be disposed on a cutter arm110that is radially opposed to the cutter arm on which the slinger220is disposed. That is, for example, the additional material provided by the weighting component942may transition the center of weight distribution toward the hub area112, thereby counteracting the additional weight provided by the slinger220to the distal end of the cutter arm110.

FIGS. 13-15illustrate an example environment where one or more portion of one or more systems, described herein, may be implemented.FIGS. 13-15are illustrative examples of an alternate implementation of a cutter assembly1300(e.g., similar to cutter assembly100ofFIGS. 1-4) operably engaged with an exemplary pump1350. As described above, the exemplary pump1350may comprise a wastewater pump that is configured to pump wastewater from a first location to a second location, such as from a residential or commercial wastewater system to a municipal waste collection system. In this example, the exemplary pump1350can comprise an intake area1352that is configured to receive fluid to be pumped, and that may pass through the alternate cutter assembly1300. As an example, the intake area1352may comprise a cavity that facilitates creation of an area of lower pressure while the pump is in operation, which can cause fluids to be drawn toward the intake area1352. Further, the intake area may be sized such that a desired fluid head pressure can be maintained during pumping, in association with expected fluid line elevation change, length and size.

In this implementation, the alternate cutter assembly1300can be operably coupled with the pump1350in the intake area. The alternate cutter assembly1300can comprise an alternate stationary wall cutter1302(e.g., similar to perimeter wall106ofFIGS. 1-7), which may be sized in accordance with expected use conditions. That is, for example, the alternate stationary wall cutter1302can project transversely from the bottom wall of the pump1350into the intake area1352. The height of the alternate stationary wall cutter1302may be determined by the size of the intake area, and/or related to and expected head pressure versus flow curve for the pump's intended use. Further, the alternate cutter assembly1300can comprise an alternate stationary base cutter plate1306(e.g., similar to base plate108ofFIGS. 1, 5 and 7). Additionally, the alternate cutter assembly1300can comprise an alternate movable cutter1304(e.g., similar to104ofFIGS. 1-3 and 8-10).

FIGS. 16-21illustrate one or more portions of one or more components for an alternate cutter assembly1300. In this implementation, as illustrated inFIG. 16, the alternate cutter assembly1300can comprise the alternate stationary wall cutter1302, the alternate stationary base cutter plate1306, and the alternate movable cutter1304. For example, much like the cutter assembly100ofFIGS. 1-4, the alternate movable cutter1304can be operably coupled with a shaft of a pump, resulting in rotation of the alternate movable cutter1304within a stationary cutter formed by the alternate stationary wall cutter1302, the alternate stationary base cutter plate1306, which can be non-movably engaged with the pump (e.g., force fit, fastened, threaded, etc.).

As illustrated inFIGS. 17-21, the stationary cutter can comprise a separate alternate stationary wall cutter1302component and an alternate stationary base cutter plate1306component. In one implementation, these components can be non-movably engaged with each other, and/or with the pump, such as by a force fitting, fastening means, or other non-movable engagement. The alternate stationary wall cutter1302can comprise a plurality of alternate wall intake ports1714(e.g., similar to perimeter intake ports114ofFIGS. 1-7), which can respectively comprise an alternate wall cutting edge1724(e.g., similar to cutting edge of wall intake ports524ofFIGS. 5-7). Further, the alternate stationary wall cutter1302can comprise one or more alternate sub-planar depressions (e.g., similar to sub-planar cutouts530ofFIGS. 5 and 7).

The alternate stationary base cutter plate1306can comprise a plurality of alternate interior plate intake ports1716(e.g., similar to interior intake ports116ofFIGS. 1 and 3-7), which can respectively comprise an alternate base cutting edge1726(e.g., similar to cutting edge of base intake ports526ofFIGS. 5-7). In one implementation, as illustrated inFIG. 21, respective interior plate intake ports1716can comprise a frustoconical shape2138, for example, where the port opening forms a frustum. As described above, this shape may provide a sharper cutting angel for the alternate base cutting edge1726. In one implementation, the base cutter plate1306can comprise a base cutter extension (not pictured), which can be associated with the one or more alternate interior plate intake ports1716. The base cutter extension can be configured to provide an extended cutting channel that may collect and force solids into the associated interior plate intake port1716. For example, the base cutter extension can be sized and shaped to facilitate solids collection, and can provide a larger cutting edge (e.g., than the alternate base cutting edge1726alone) for the shearing action provided by an alternate cutter arm1734. Further, the base cutter plate1306can comprise a plurality of perimeter base ports that are respectively configured to align with a corresponding alternate wall intake port1714. Additionally, the base cutter plate1306can comprise one or more alternate channels1728(e.g., similar to channels528ofFIGS. 5-7).

As illustrated inFIGS. 16, 18 and 19, the alternate movable cutter1304can comprise the alternate hub area1712, which can be configured to receive (e.g., and engage with) at least a portion of the pump shaft. The alternate movable cutter1304can comprise one or more alternate cutter arms1710(e.g., similar to cutter arm110FIGS. 1, 3, 4, and 8), respectively comprising an alternate axial cutter edge (e.g., similar to the first cutting edge834FIGS. 8-12). Further, the alternate movable cutter1304can comprise an alternate radial cutter edge (e.g., similar to the second cutting edge836FIGS. 8-12). Additionally, the alternate movable cutter1304can comprise one or more alternate slinger components1620. In one implementation, an example, movable cutter1304can comprise at least two alternate slingers1620, respectively disposed on a distal portion of alternate cutter arms1710, where the respective cutter arms1710are disposed in a same axis passing through the hub area1712. In this way, for example, the weight distribution may not be substantially affected, as substantially a same amount of weight may be added to the respective cutter arms1710, on a same axis.

FIGS. 22A, 22B, 23A, 23B, 23C, 24A, 24B, and 24Care component diagrams illustrating an exemplary alternate cutter/grinder assembly2200that can be used in a fluids pump system. In this implementation, the example assembly2200comprises a stationary cutter base2202and a rotating cutter2204. The stationary cutter base2202comprises a stationary cutter plate2208and a stationary cutter wall2206. The stationary cutter plate2208is configured to operably couple with an intake area of a pump (e.g.,1352of pump1350inFIG. 13), such as by using a retaining ring (e.g.,1454ofFIG. 14) and fasteners (e.g.,1456ofFIG. 14), for example. In this implementation, the stationary cutter plate2208can comprise a plurality of intake ports, comprising a first set of plate intake ports2214and a second set of plate intake ports2216. In the implementation, the first set of plate intake ports2214may be disposed around a perimeter portion of the stationary cutter plate2208. Further, the second set of plate intake ports2216may be disposed in an interior portion of the stationary cutter plate2208.

In this implementation, in the example assembly2200, the stationary cutter wall2206can be fixedly engaged (e.g., fastened, welded, bonded, integrally formed, etc.) with the stationary cutter plate2208, where the wall2206is projecting in a substantially transverse direction from the perimeter of an intake side (e.g.,1352) of the stationary cutter plate2208. In this implementation, the stationary cutter wall2206can comprise a wall intake port (e.g., a radial intake port) disposed in substantial alignment with the respective first set of plate intake ports2214. Additionally, one or more of the respective wall intake ports can comprise a wall cutting edge2324(e.g., radial cutting edge).

In the example assembly2200, with reference toFIGS. 13-15, a rotating cutter2204can be configured to engage with a rotating shaft1358of the pump1350, for example, such that rotation of the shaft1358can result in rotation of the rotating cutter2204. In one implementation, the rotating cutter can comprise a cutter hub2212that is configured to selectably engage with the shaft of a pump, for example, for removal and replacement of the cutter2204in a pump (e.g.,1350). In one implementation, the movable cutter104can comprise keyway2432that is configured to selectably engage with a corresponding key coupled with the shaft1358of the pump1350. As an example, the shaft1358of a pump1350may comprise a key that is configured (e.g., in shape and size) to slidably engage with the keyway1358at the cutter hub2212. In this way, in this example, a rotation of the shaft may result in a rotation of the movable cutter, such as during pump operation.

The rotating cutter2204can comprises a plurality of cutting arms2210(e.g., two or more) that project radially from a central hub portion2212of the rotating cutter2204. The respective cutting arms2210can comprise an axial cutting edge2434(e.g., first cutting edge) and a radial cutting edge2436(e.g., second cutting edge). In one implementation, the axial cutting edge2434can be disposed at a leading edge of the cutting arm2210, and be configured to provide a cutting action in operation with a stationary plate cutting edge2326(e.g., stationary axial cutting edge) disposed on one or more of the respective second set of plate intake ports2216(e.g., axial intake port). Further, the radial cutting edge2436can be disposed on a distal end of the cutting arm2210, and be configured to provide a cutting action in operation with one or more of the wall cutting edges2324.

In one implementation, one or more of the second set of plate intake ports2216can respectively comprise an ellipse shape (e.g., circle or oval shaped), and/or an elongated ellipse shape (e.g., elongated circle and/or ellipse). In this way, for example, the elongated portion of the intake port2216can provide a longer cutting edge with the axial cutting edge2434of the cutting arm2210, thereby improving the cutting action acting on fluid entrained solids. Further, in one implementation, the second set of plate intake ports2216can be disposed on the stationary cutter plate2208in a pattern configured to provide efficient and effective solids cutting/shearing action. In another implementation, the second set of plate intake ports2216can be disposed on the stationary cutter plate2208substantially random alignment. For example, a random alignment may allow for multiple and varied interaction with fluids entrained solids between the axial cutting edge2434of the cutting arm2210and the second set of plate intake ports2216, such as with the stationary plate cutting edge2326.

In one implementation, the second set of plate intake ports2216can be disposed in a generally radial alignment on the stationary cutter plate2208between the hub portion2212and the perimeter2206. For example, an elongated intake port2216can be aligned radially in order to provide for a longer cutting action between the axial cutting edge2434of the cutting arm2210and the intake port2216while the cutting arm2210rotates around the stationary cutter plate2208. Further, a radially aligned intake port2216can allow for improved and more efficient fluid flow radially from the hub portion2212out to the wall2206. In this way, the first set of intake ports2214may receive a portion of the fluid intake.

In one implementation, the stationary cutter plate2208can comprise one or more channels2328that are respectively, fluidly coupled with at least one of the second set of plate intake ports2216. Further, the one or more channels2328can be respectively, fluidly coupled with at least one of the first set of plate intake ports2216. As an example, the channel2328can be configured to facilitate translation of fluid and/or solids from a central area (e.g., the hub portion2212) toward the inside portion of the wall2206. Further, in one implementation, a channel may be disposed between the hub portion2212and the inside portion of the wall2206, such as leading to respective perimeter intake ports2214. Additionally, one or more interior intake ports2216may be disposed along a channel2328. In this implementation, a channel leading from an interior intake port2216may facilitate movement of sheared solids toward inside portion of the wall2206. In one implementation, one or more or the channels may terminate at a perimeter intake port2214. In this way, for example, solids that are translated along a channel2328toward the perimeter intake port2214may be subjected to the radial shearing action of the radial cutting edge2434combined with the terminal end of a rotating cutting arm2210. In one implementation, a direction, length and design of the respective channels2328may be determined based on use conditions of the cutter/grinder system2200, for example, a speed of the rotating arms2210, size of solids, expected head pressure, pipe diameters, fluid characteristics, and other conditions.

In one implementation, the stationary cutter wall2206can comprise one or more sub-planar cut-outs2330that are disposed on the intake side of the stationary cutter wall2206. The one or more sub-planar cut-outs2330can be fluidly coupled with at least one wall intake port2214. As an example, the respective sub-planar cut-outs2330may be configured to mitigate clogging of the cutter/grinder system2200, and/or to improve flow of a fluid comprising solids through the intake ports2214,2216. As an example, a location and size of the sub-planar cut-outs2330can provide for improved solids shearing/grinding action results. For example, a size, location, number and depth of a sub-planar cut-outs2330may vary depending on an expected application of the assembly2200(e.g., amount and type of solids, type of fluid, pipe size, head pressure, etc.).

In one implementation, the one or more of the respective wall intake ports2214can comprise a major arc shape, where the wall cutting edge2324is disposed at a trailing point of the major arc shape. For example, as illustrated inFIG. 23A, the shape of the perimeter wall intake port2214comprises a major arc (e.g., where two points on a circle define two arcs, a major arc and a minor arc, when the points are not directly across from each other). That is, for example, a major arc comprises greater than a one-hundred and eighty degrees of a circle. In this implementation, the trailing point (e.g., the second point of the port2214addressed by the radial cutting edge2436when the rotating cutter2204is rotating) can comprise the wall cutting edge2324. In this way, for example, the major arc shape of the wall intake ports2214can provide a more acute cutting edge for the wall cutting edge2324than be provided by slits or half-circle shaped slots. For example, the acute shape provided by the major arc shape of the wall cutting edge2324can improve the cutting/shearing action between the wall cutting edge2324and the radial cutting edge2436.

In one implementation, one or more of the radial cutting edges2436can comprise a first cutting angle and a second cutting angle. For example, the radial cutting edge2436can comprise a different cutting angle (e.g., first, second, third, fourth, etc.). In this way, in this example, engaged solids entrained in a fluid may be operated upon from different angles to provide a more effective cutting/shearing action. In this way, for example, having varied cutting angles and/or positions may provide for a more effective cutting/grinding of solid matter, such as by impacting the matter at various locations (e.g., and at different cutting angles) during rotating cutter2204rotation.

In one implementation, the respective cutting arms2210can comprise a serrated surface2438disposed at the leading side, which can provide a serrated axial cutting edge2434. As an example, a serrated cutting edge can comprise a plurality of smaller points of contact with the solid matter, entrained in the fluid, subjected to the shearing action. For example, having a smaller contact area than a straight edge allows applied pressure at each point of contact to impart a greater force to the subject solids. Further, the curved nature of the serrated edges2438can provide a sharper angle to the material being acted upon. In this example, this may result in an improved cutting/shearing action in conjunction with the shape of the interior intake port cutting edge2326, for example, particularly as the cutter arm2210rotates around the base plate2208.

Additionally, the rotating cutter can comprise a relief portion2446that is disposed at a trailing edge of one or more of the cutting arms2210, and configured to mitigate a cavitation effect. For example, a shape, size and/or angle of disposition of the trailing edge2440can be configured to mitigate a cavitation effect that may result from the movable cutter2204rotating through a fluid. That is, for example, a lower pressure may form behind the cutter arm2210as it moves through the fluid (e.g., at the trailing side of the cutter arm). In this example, the lower pressure can allow fluid cavitation to occur, which may result in damage to the material (e.g., metal) forming the cutter arm2210. Altering the shape of the trailing edge2440, such as by using the relief portion2446, and/or a shape, size, and placement of an underside2444of the cutting arm2210, can help mitigate this lower pressure behind the cutter arm2210, thereby mitigating potential damage to the cutter arm2210.

In one aspect, a method for using a pump, comprising a solids cutting/shearing assembly/system, can be devised. In one implementation, in this aspect, a method can comprise installing a pump in a system for transporting a fluid that comprises a mixture of fluids and solids (e.g., a wastewater system). In this implementation, the pump can comprise a stationary cutter that is operably coupled with an intake end of the pump. In this implementation, the stationary cutter can comprise a perimeter wall projecting in a substantially transverse direction from the intake side of the pump, where the wall comprising a plurality of perimeter intake ports, respectively comprising a radial cutting edge. Further, the stationary cutter can comprise a plurality of interior intake ports disposed on a base of the stationary cutter, where the plurality of interior intake ports respectively comprising an axial cutting edge.

In this implementation of an exemplary method, the pump can additionally comprise a movable cutter engaged with a rotating shaft of the pump in operable engagement with the stationary cutter and can be configured to rotate to engage with the solids. The movable cutter can comprise two or more cutting arms that are projecting radially from a central hub of the rotating cutter. Further, the movable cutter can comprise a first cutting edge that is disposed on a leading side of respective cutting arms, and can be configured to provide a cutting action in combination with one or more of the axial cutting edges. The movable cutter can also comprise a second cutting edge that is disposed on respective cutting arms, and can be configured to provide a cutting action in combination with one or more of the radial cutting edges.

In this implementation, the example method may also include placing the pump in a condition that allows it to be activated in a manner that provides a reduction in a size of the solids in the fluid for pumping. For example, the pump, comprising the cutter assembly, can be placed in use at a wastewater system, and activated to provide cutting, grinding and or shearing of solids entrained in fluid disposed in the wastewater system.

Although the subject matter has been described in language specific to structural features and/or methodological acts, it is to be understood that the subject matter defined in the appended claims is not necessarily limited to the specific features or acts described above. Rather, the specific features and acts described above are disclosed as example forms of implementing the claims. Reference throughout this specification to “one embodiment” or “an embodiment” means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases “in one embodiment” or “in an embodiment” in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. Of course, those skilled in the art will recognize many modifications may be made to this configuration without departing from the scope or spirit of the claimed subject matter.

Also, although the disclosure has been shown and described with respect to one or more implementations, equivalent alterations and modifications will occur to others skilled in the art based upon a reading and understanding of this specification and the annexed drawings. The disclosure includes all such modifications and alterations and is limited only by the scope of the following claims. In particular regard to the various functions performed by the above described components (e.g., elements, resources, etc.), the terms used to describe such components are intended to correspond, unless otherwise indicated, to any component which performs the specified function of the described component (e.g., that is functionally equivalent), even though not structurally equivalent to the disclosed structure which performs the function in the herein illustrated exemplary implementations of the disclosure.

In addition, while a particular feature of the disclosure may have been disclosed with respect to only one of several implementations, such feature may be combined with one or more other features of the other implementations as may be desired and advantageous for any given or particular application. Furthermore, to the extent that the terms “includes,” “having,” “has,” “with,” or variants thereof are used in either the detailed description or the claims, such terms are intended to be inclusive in a manner similar to the term “comprising.”