KR102437971B1 - Integrated Actuator for Active Purge Control - Google Patents

Abstract

The integrated actuator (1) for active purge control of the present invention has a pump inlet nipple (14A) that sucks in the fuel boil-off gas by the differential pressure of the internal space by the rotation of the impeller (17), and a pump outlet nipple (14B) that discharges the fuel boil-off gas The active purge pump 10 is coupled to the provided active purge pump 10 and the pump inlet nipple 14A to open and close the inlet passage of the fuel evaporation gas, or is coupled to the pump outlet nipple 14B to open and close the discharge passage of the fuel evaporation gas. Since the control valve 20 is configured as an integrated structure, the overall system layout of the actuator is simplified and cost is reduced by reducing the line configuration, product material cost, manufacturing man-hours, etc. for connecting the valve and the pump, especially the screw fastening structure for the pump. Since the separation distance of the valve made in the final process stage can be adjusted using the

Description

Integrated Actuator for Active Purge Control

The present invention relates to a purge control actuator, and more particularly, to an integrated actuator for active purge control in which an active purge pump and an active purge control valve are integrally formed.

In general, a vehicle is equipped with a fuel boil-off gas control system, through which the fuel tank and the engine are connected to collect the boil-off gas generated from the fuel tank, and then to the combustion chamber of the engine instead of emitting gasoline boil-off gas generated from the fuel system to the atmosphere. It satisfies environmental regulations on hydrocarbons evaporated from fuels by supplying and burning them.

To this end, the fuel boil-off gas control system applies a purge control actuator, and the purge control actuator includes a purge control valve and a purge pump.

From this, when the purge control actuator needs to consume the boil-off gas collected in the canister, the passage is opened through the ECU (Electronic Control Unit), and the boil-off gas line is connected to the intake manifold that supplies the mixture to the fuel tank and the engine. It sends the boil-off gas to burn it in the engine.

Domestic registered patent KR 10-1882600 (July 20, 2018)

However, when the purge control actuator comprises the purge control valve and the purge pump in a separate structure, the following problems are inevitable.

For example, in the separation structure of the purge control valve and the purge pump, a purge control valve is mounted at the rear end of the canister compared to the purge pump mounted on the canister to perform boil-off gas purge in the fuel line system.

From this, the purge control valve and the purge pump have a problem in that a lot of line configuration, product material cost, and manufacturing man-hours for connecting the valve and the pump are inevitably input.

Accordingly, the present invention in consideration of the above points reduces the overall system layout of the actuator and the cost by reducing the line configuration for connecting the valve and the pump, product material cost, manufacturing man-hours, etc. by configuring the active purge pump and the active purge control valve in an integrated structure. In particular, by using the screw fastening structure for the pump, the separation distance of the valve can be adjusted in the final process stage, so the stroke control of the valve can be easily adjusted by controlling the movement distance of the armature Provide an integrated actuator for active purge control has a purpose

The integrated actuator of the present invention for achieving the above object is coupled to the pump inlet nipple of the active purge pump that forms a differential pressure in the inner space by the rotation of the impeller to open and close the fuel evaporation gas inlet passage or is coupled to the pump outlet nipple It characterized in that it includes an active purge control valve for opening and closing the fuel evaporation gas discharge passage.

In a preferred embodiment, the active purge control valve is divided into an inlet sharing type active purge control valve for opening and closing the fuel evaporation gas inlet passage and an outlet sharing type active purge control valve for opening and closing the fuel evaporation gas discharge passage.

As a preferred embodiment, the inlet sharing type active purge control valve is a valve housing provided with a valve armature for opening the fuel boil-off gas inlet passage away from the pump inlet nipple by position movement by magnetic force, and a valve for introducing fuel boil-off gas. It consists of a valve cover provided with a pump inlet connection port defining an interior space communicating with the inlet nipple.

In a preferred embodiment, the valve inlet nipple and the pump inlet connecting port are formed in a straight line, and the pump inlet connecting port engages the valve housing with an upper portion and couples the pump inlet nipple with a lower portion.

In a preferred embodiment, the pump inlet connection port positions the pump inlet nipple and the valve armature to face each other in the inner space, and the valve armature forms a valve stroke at a spacing with respect to the pump inlet nipple to form the valve stroke Open and close the fuel evaporation gas inlet passage.

In a preferred embodiment, the valve housing is located between the electromagnet for generating the magnetic force for position movement of the valve armature, a valve spring for elastically supporting the electromagnet and the valve armature, and the electromagnet and the valve armature to provide the valve armature. an armature damper for absorbing and buffering the lifting force of the armature, and a packing coupled to the valve armature and contacting the pump inlet nipple.

In a preferred embodiment, the electromagnet is provided with a screw fastening part on a core, and the separation distance with respect to the valve armature is adjusted by the screw fastening part of the core. The armature damper is made of rubber or plastic, and the packing is made of rubber.

In a preferred embodiment, the outlet sharing type active purge control valve includes a valve housing having a valve armature for opening the fuel boil-off gas discharge passage communicating with the pump outlet nipple by position movement by magnetic force, and communicating with the pump outlet nipple a valve outlet nipple for discharging fuel evaporative gas from the internal space to the outside, a pump outlet connection port connected to the pump outlet nipple to send the evaporative fuel gas to the internal space, and opening and closing the fuel evaporative gas discharge passage It consists of a pump gerber equipped with a nipple boss located in the inner space.

In a preferred embodiment, the valve outlet nipple and the pump outlet connecting port form a right angle to each other, and the nipple boss protrudes from the pump outlet connecting port to face the valve armature.

In a preferred embodiment, the valve housing is located between the electromagnet for generating the magnetic force for position movement of the valve armature, a valve spring for elastically supporting the electromagnet and the valve armature, and the electromagnet and the valve armature to provide the valve armature. (24) an armature damper for absorbing and buffering the lifting force, and a packing coupled to the valve armature and contacting the nipple boss.

In a preferred embodiment, the electromagnet is provided with a screw fastening part on the core, and the separation distance with respect to the valve armature is adjusted by the screw fastening part of the core).

In a preferred embodiment, the armature damper and the packing are made of rubber.

In a preferred embodiment, the pump housing includes the impeller, the pump housing defining the inner space in which the differential pressure is formed, and the pump coupled to the pump housing, the pump having the pump inlet nipple and the pump outlet nipple Includes cover.

In a preferred embodiment, the pump inlet nipple and the pump outlet nipple are at right angles to each other.

In a preferred embodiment, the pump housing includes a motor driven by a purge command signal output from a controller, and an impeller that is rotated by a motor impeller shaft connected to the motor to form the differential pressure.

The integrated actuator of the present invention implements the following actions and effects for active purge control.

First, by integrating the active purge pump/purge control valve, the active purge control actuator implements an integrated structure, thereby simplifying the overall system layout and reducing cost. Second, with the integrated structure of the pump and the valve, problems such as the addition of a line configuration of the existing separate structure required for product connection/high product material cost, etc. can be resolved. Third, the integrated structure of the pump and valve is implemented as an integrated nipple sharing method of the pump inlet nipple (INLET NIPPLE) and the valve outlet nipple (OUTLET NIPPLE). / The problem of increased air transportation costs can also be resolved. Fourth, a design structure that determines the valve stroke as an integrated nipple structure is possible by applying the integrated nipple sharing method. Fifth, the stroke control of the valve can be easily adjusted to the movement distance control of the armature by applying the valve separation distance control at the final process stage as a screw fastening structure for the pump.

1 is a block diagram of an integrated actuator for active purge control according to the present invention, FIG. 2 is a block diagram of an active purge pump constituting the integrated actuator according to the present invention, and FIG. 3 is an inlet constituting the integrated actuator according to the present invention A configuration diagram of a /outlet shared type active purge control valve, FIG. 4 is a valve stroke formation state of an inlet/outlet shared type active purge control valve according to the present invention, and FIG. 5 is an active purge of the inlet shared type active purge control valve according to the present invention The operating state of the integrated actuator for active purge control in connection with the pump, and FIG. 6 is the operating state of the integrated actuator for active purge control in connection with the active purge control valve of the shared outlet type active purge control valve according to the present invention.

Hereinafter, an embodiment of the present invention will be described in detail with reference to the accompanying illustrative drawings, and since such an embodiment may be implemented in various different forms by those of ordinary skill in the art to which the present invention pertains, it will be described herein It is not limited to the embodiment.

Referring to FIG. 1 , the integrated actuator 1 includes an active purge pump 10 and an active purge control valve 20 . The integrated actuator 1 is therefore characterized as an integrated actuator for active purge control.

Specifically, the active purge pump 10 includes a pump housing 11 , a pump cover 14 , a motor 15 , an impeller 17 , and a controller 19 .

For example, the pump housing 11 forms the external shape of the pump, and forms an airtight inner space in which the motor 15 , the impeller 17 , and the controller 19 are built. The pump cover 14 is assembled on the upper part of the pump housing 11 and has a pump inlet nipple 14A and a pump outlet nipple 14B communicating with the inner space of the pump housing 11 .

In particular, the pump inlet nipple 14A is formed vertically in the longitudinal section of the pump housing 11, while the pump outlet nipple 14B is formed horizontally in the transverse section of the pump housing 11, so that the layout is perpendicular to each other. is formed In this case, the pump inlet nipple 14A is a passage for sucking the fuel boil-off gas collected in the canister (not shown), and the pump outlet nipple 14B is a passage for sending the fuel boil-off gas to the boil-off gas line connected to the intake manifold. to be.

For example, the motor 15 includes a motor magnet, a motor coil, a rotor back yoke, a motor stator core, a motor carbon fiber, and a motor insulator, and generates rotational power. The impeller 17 receives the rotational power of the motor 15 through the rotor impeller shaft 17A (refer to FIG. 2), and forms a vacuum in the inner space of the pump housing 11 with the impeller rotational force to generate fuel evaporation gas. inhale

For example, the controller 19 drives the motor 15 with a motor drive signal output matched to an external signal (eg, a switch signal for fuel purging or an engine ECU output).

Specifically, the active purge control valve 20 includes a valve housing 21 , a valve cover 22 , an electromagnet 23 , a valve armature 24 , a valve spring 25 , an armature damper 26 and a packing 27 . includes

For example, the valve housing 21 forms a valve external shape, and forms an airtight inner space in which the electromagnet 23 , the valve armature 24 , the valve spring 25 and the armature damper 26 are built. In particular, the valve housing 21 is electrically connected to the outside through the valve terminal 21A to supply power to the electromagnet 23 , and a valve damper 21B is provided on one side to relieve vibration caused by valve driving. do it The valve cover 22 forms a passage through which the evaporated fuel gas is sucked from the canister, is coupled to the lower portion of the valve housing 21 , and is assembled with the pump inlet nipple 14A of the pump cover 14 .

For example, the electromagnet 23 generates a magnetic force by magnetization by the supplied power. The valve armature 24 is switched from valve closed (ie, valve Off) to valve open (ie, valve On) to communicate the pump inlet nipple 14A and the valve inlet nipple 22A of the pump cover 14 . The valve spring 25 forms a spring reaction force. The armature damper 26 is made of rubber or plastic to relieve and absorb the shock caused by the elevation of the valve armature 24 . The packing 27 is made of rubber and is in close contact with the pump inlet nipple 14A, thereby blocking the pump inlet nipple 14A.

Therefore, the active purge control valve 20 is divided into an inlet shared type active purge control valve 20 - 1 and an outlet shared type active purge control valve 20 - 2 by different configurations of the valve cover 22 .

Specifically, the valve cover 22 including the valve inlet nipple 22A and the pump inlet connection port 22B is applied to the inlet sharing type active purge control valve 20-1.

For example, the valve inlet nipple 22A constitutes a passage through which the fuel evaporation gas is sucked from the canister, and the pump inlet connection port 22B is assembled to the lower part of the valve housing 21 as its upper part and to its lower part. It is assembled with the pump inlet nipple 14A of the pump cover 14 .

In particular, the pump inlet connection port 22B forms an inner space in which the valve armature 24 and the pump inlet nipple 14A face each other, and the upper and lower portions of the valve armature 24 according to the magnetization of the electromagnet 23 . As it moves, the packing 27 associated with the valve armature 24 contacts the pump inlet nipple 14A to close the valve (i.e., valve Off) while away from the pump inlet nipple 14A to open the valve (i.e., the valve On). ) to form

On the other hand, the valve cover 22 composed of a valve outlet nipple 22C, a pump outlet connection port 22D and a nipple boss 22E is applied to the outlet sharing type active purge control valve 20-2.

For example, the valve outlet nipple 22C forms a passage through which the fuel boil-off gas from the pump outlet nipple 14B of the active purge pump 10 is discharged, and the pump outlet connection port 22D is an active purge pump 10 is assembled with the pump outlet nipple (14B) of In particular, the valve outlet nipple 22C and the pump outlet connection port 22D have a right angle structure to form an inner space of the valve cover 22 .

For example, the nipple boss 22E protrudes to occupy the inner space of the valve cover 22, communicates the discharge hole of the valve outlet nipple 22C with the inner space, and in the inner space of the valve cover 22 Contact with packing 27 forms valve closure (ie, valve off) while away from packing 27 forms valve open (ie valve on).

In this way, the active purge control valve 20 is a common inlet type active purge control valve 20-1 or a pump using the pump inlet nipple 14A of the active purge pump 10 as a common component for suction of the fuel boil-off gas. It is composed of an outlet common type active purge control valve 20-2, which uses the outlet nipple 14B as a common component for discharging fuel boil-off gas.

Therefore, the integrated actuator 1 forms a structure in which the active purge pump 10 and the active purge control valve 20 are integrated, and a line configuration, product material cost, and manufacturing for connecting the product from this pump/valve integrated structure. It is characterized as an integrated actuator for active purge control that eliminates all the disadvantages of the existing pump/valve separation structure, which requires a lot of man-hours.

Meanwhile, FIG. 2 shows a detailed configuration of the active purge pump 10 .

As shown, the active purge pump 10 pumps into a pump lower housing 11A, a pump middle housing 11B, a controller cover 11C, a pump terminal 11A-1 and a pump damper 11A-2. constituting the housing 11, assembling the pump housing 11 and the pump cover 14 with the fastening member 12, the impeller bush 13, the rotor impeller shaft 17A, the bearing 18 and the bearing container ( 18A) Assemble the motor 15 and the impeller 17.

For example, the pump lower housing 11A forms the inner space of the pump housing 11 and has a pump terminal 11A-1 on one side to supply power to the motor 15 and the controller 19 while supplying power to the controller. It transmits an external signal to (19) and has a damper part wrapped around the motor 15 and the pump damper 11A-2 that absorbs/buffers vibrations caused by the driving of the motor 15 on the opposite side.

In particular, the pump lower housing 11A facilitates the power line connection by exposing the motor pin 15A of the motor 15 to the lower bottom surface thereof.

For example, the pump middle housing 11B is fitted to the upper part of the pump lower housing 11A to separate the inner space of the pump middle housing 11B from the pump cover 14, and the bearing container 18A is assembled. provide space. The controller cover 11C is fitted to the lower portion of the pump lower housing 11A to block external exposure of the controller 19 located on the lower surface of the pump lower housing 11A.

For example, the fastening member 12 assembles the pump cover 14 to the pump lower housing 11A using bolt bosses protruding from each of the pump lower housing 11A and the pump cover 14 . In particular, the fastening member 12 is composed of six at intervals of 60 degrees, but less or more is possible. To this end, the fastening member 12 applies screws, but bolts/nuts or fasteners may be applied.

For example, the impeller bush 13 is positioned below the impeller 17 and is coupled to the rotor impeller shaft 17A. The rotor impeller shaft 17A continues from the rotor of the motor 15 and is connected to the impeller 17, and the impeller bush 13 is coupled to the shaft end. The bearing 18 supports the middle section of the rotor impeller shaft 17A, and is composed of a plurality of bearings. The bearing container 18A accommodates the bearing 18 and is coupled with the pump middle housing 11B.

Meanwhile, FIGS. 3 to 4 show an electromagnet 23, a core 23A, a valve armature 24, and a valve spring 25, which are commonly configured in the inlet/outlet shared type active purge control valves 20-1 and 20-2. ), the armature damper 26, the packing 27, and the detailed structure for the screw fastening part 29 are shown.

As shown, the electromagnet 23 generates a magnetic force by magnetization by the power supplied with the core 23A as a component together with the bobbin and the coil, and the valve armature 24 is the magnetic force of the electromagnet 23 . is pulled upward, and the valve spring 25 provides a spring reaction force to the return of the valve armature 24 while elastically supporting the core 23A and the valve armature 24, and the armature damper 26 is the core ( 23A) and the inner space of the valve armature 24 to the core 23A side. The packing 27 wraps around the end portion of the valve armature 24 and is coupled to move together with the valve armature 24 .

In particular, the screw fastening part 29 is composed of a male screw 29A of a protruding boss formed at the upper end of the core 23A and a female screw 29B of a boss hole drilled in the electromagnet case, through which the separation distance of the core 23A is increased. By being adjustable, the valve stroke S (see FIG. 4 ) is adjusted.

Meanwhile, FIG. 5 shows the operation of the inlet sharing type active purge control valve 20-1.

As shown, when the electromagnet 23 forms a magnetic force, the valve armature 24 is pulled upward by magnetic force, and the valve spring 25 is compressed by the rise of the valve armature 24, and the packing ( 27) goes up with the valve armature 24.

Then, the valve stroke S is formed by the distance between the valve armature 24 (or packing 27) and the pump inlet nipple 14A, and the formation of the valve stroke S is the closing of the valve (ie, the valve Off). ) to open the valve (i.e., valve On), so that the valve inlet nipple 22A of the valve cover 22 and the pump inlet connection port 22B and the pump inlet nipple 14A of the pump cover 14 communicate with each other .

Then, the rotational force of the motor 15 driven by application of a control signal to the controller 19 of the active purge pump 10 rotates the impeller 17 connected to the motor impeller shaft 17A at high speed, and the pump housing ( 11), the internal space of the impeller 17 forms a differential pressure due to high-speed rotation so that the pump flow rate (ie, fuel boil-off gas flow rate) flows from the valve inlet nipple 22A of the valve cover 22 to the pump inlet connection port 22B. After flowing into the pump inlet nipple (14A) through the flow to the pump outlet nipple (14B).

As a result, the evaporated fuel gas collected in the canister forms a path flowing into the engine side through the active purge control valve 20 and the active purge pump 10 .

On the other hand, Figure 6 shows the operation of the outlet shared type active purge control valve (20-2).

As shown, when the electromagnet 23 forms a magnetic force, the valve armature 24 is pulled upward by magnetic force, and the valve spring 25 is compressed by the rise of the valve armature 24, and the packing ( 27) goes up with the valve armature 24.

Then, the valve stroke S is formed by the distance between the valve armature 24 (or the packing 27) and the nipple boss 22E, and the formation of the valve stroke S is the valve closing (ie, the valve Off). By making the valve open (ie, valve On), the pump outlet connection port 22D of the valve cover 22 and the valve outlet nipple 22C and the outlet inlet nipple 14B of the pump cover 14 communicate with each other.

Then, the rotational force of the motor 15 driven by application of a control signal to the controller 19 of the active purge pump 10 rotates the impeller 17 connected to the motor impeller shaft 17A at high speed, and the pump housing ( 11), the pump flow rate (ie, fuel boil-off gas flow rate) flows into the pump inlet nipple 14A and then flows into the pump outlet nipple 14B by forming a differential pressure due to the high-speed rotation of the impeller 17 .

Then, the pump flow rate (ie, fuel boil-off gas flow rate) exiting the pump outlet nipple 14B passes through the pump outlet connection port 22D of the valve cover 22 to the valve outlet nipple 22C.

As a result, the evaporated fuel gas collected in the canister forms a path flowing into the engine side through the active purge control valve 20 and the active purge pump 10 .

As described above, the integrated actuator 1 for active purge control according to the present embodiment discharges the pump inlet nipple 14A for sucking the fuel boil-off gas by the differential pressure of the internal space due to the rotation of the impeller 17 and the fuel boil-off gas. The active purge pump 10 provided with a pump outlet nipple 14B to The active purge control valve 20 that opens and closes the discharge passage is configured in an integrated structure, thereby reducing the line configuration for connecting the valve and the pump, product material cost, manufacturing man-hours, etc., thereby simplifying the overall system layout of the actuator and reducing the cost, especially Since the separation distance of the valve made in the final process stage can be adjusted using the screw fastening structure for the pump, the stroke control of the valve can be easily adjusted by controlling the movement distance of the armature.

1: Integrated actuator
10: active purge pump
11: pump housing 11A: pump lower housing
11B: pump middle housing 11C: controller cover
11A-1 : Pump Terminal 11A-2 : Pump Damper
12: fastening member 13: impeller bush
14: pump cover 14A: pump inlet nipple
14B: pump outlet nipple 15: motor
15A: motor pin 17: impeller
17A: rotor impeller shaft 18: bearing
18A: bearing container 19: controller
20: active purge control valve
20-1, 20-2 : inlet/outlet shared type active purge control valve
21: valve housing 21A: valve terminal
21B: valve damper 22: valve cover
22A: valve inlet nipple 22B: pump inlet connection port
22C : Valve Outlet Nipple 22D : Pump Outlet Connection Port
22E: nipple boss 23: electromagnet
23A: core 24: valve armature
25: valve spring 26: armature damper
27: packing 29: screw fastening part
29A: male thread 29B: female thread

Claims (18)

It is coupled to the pump inlet nipple of the active purge pump that creates a differential pressure in the internal space by the rotation of the impeller to open and close the fuel evaporative gas inlet passage. an active purge control valve classified as an outlet shared type active purge control valve is included;
The inlet sharing type active purge control valve is separated from the pump inlet nipple by position movement by magnetic force and communicates with a valve housing having a valve armature for opening the fuel boil-off gas inlet passage, and a valve inlet nipple for introducing fuel boil-off gas Consists of a valve cover with a pump inlet connection port defining an inner space;
The valve housing is positioned between the electromagnet for generating the magnetic force for position movement of the valve armature, a valve spring for elastically supporting the electromagnet and the valve armature, and the electromagnet and the valve armature to absorb the lifting force of the valve armature and an armature damper for buffering, and a packing coupled to the valve armature and in contact with the pump inlet nipple;
The electromagnet includes a screw fastening part on a core, and the core is an integrated actuator, characterized in that the separation distance with respect to the valve armature is adjusted by the screw fastening part.
delete delete The integrated actuator according to claim 1, wherein the valve inlet nipple and the pump inlet connection port are formed in a straight line.
The integrated actuator according to claim 1, wherein the pump inlet connection port couples the valve housing to an upper portion and the pump inlet nipple to a lower portion.
The method according to claim 1, wherein the pump inlet connection port positions the pump inlet nipple and the valve armature to face each other in the inner space, and the valve armature forms a valve stroke at a spacing with respect to the pump inlet nipple to form a valve stroke, An integrated actuator that opens and closes the fuel evaporation gas inlet passage.
delete delete The integrated actuator according to claim 1, wherein the armature damper is made of rubber or plastic, and the packing is made of rubber.
The method according to claim 1, wherein the outlet shared type active purge control valve is
A valve housing provided with a valve armature for opening the fuel boil-off gas discharge passage communicating with the pump outlet nipple by position movement by magnetic force, and
A valve outlet nipple for discharging fuel boil-off gas to the outside from the internal space communicating with the pump outlet nipple, a pump outlet connection port connected to the pump outlet nipple to send the fuel boil-off gas to the inner space, and the fuel boil-off gas Pump cover provided with a nipple boss positioned in the inner space to open and close the discharge passage
Integrated actuator, characterized in that consisting of.
The integrated actuator of claim 10 , wherein the valve outlet nipple and the pump outlet connection port form a right angle to each other.
The integrated actuator according to claim 10, wherein the nipple boss protrudes from the pump outlet connection port to face the valve armature.
The valve armature according to claim 10, wherein the valve housing is positioned between an electromagnet generating the magnetic force for position movement of the valve armature, a valve spring elastically supporting the electromagnet and the valve armature, and the electromagnet and the valve armature. An integrated actuator comprising an armature damper for absorbing and buffering the lifting force of the armature, and a packing coupled to the valve armature and contacting the nipple boss.
The integrated actuator according to claim 13, wherein the electromagnet has a screw fastening part on a core, and the distance between the core and the valve armature is adjusted by the screw fastening part.
The integrated actuator according to claim 13, wherein the armature damper and the packing are made of rubber.
The method according to claim 1, It includes a pump housing having the impeller and forming the inner space in which the differential pressure is formed, and a pump cover coupled to the pump housing and provided with the pump inlet nipple and the pump outlet nipple Integrated actuator, characterized in that.
The integrated actuator of claim 16 , wherein the pump inlet nipple and the pump outlet nipple form a right angle with respect to each other.
The integrated actuator according to claim 16, wherein the pump housing includes a motor driven by a purge command signal output of a controller, and the motor rotates the impeller with a motor impeller shaft.

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