WO2007115627A1

WO2007115627A1 - Immersion pump

Info

Publication number: WO2007115627A1
Application number: PCT/EP2007/002114
Authority: WO
Inventors: Bernhard Beck; Kerstin Kopka; Michael Meyer
Original assignee: Alfred Kärcher Gmbh & Co. Kg
Priority date: 2006-04-06
Filing date: 2007-03-10
Publication date: 2007-10-18
Also published as: EP2002124A1; CN101415949A; DE202007019595U1; DE102006016981A1

Abstract

The invention relates to an immersion pump having a housing which holds a motor and an impeller which is driven by said motor, and which housing has a suction opening for sucking in liquid and an outlet opening for dispensing the liquid. In order to further develop the immersion pump in such a way that it is cost-effective to assemble, it is proposed according to the invention that the housing has an upper part, a central part and a lower part which are embodied as separate housing parts, wherein the central part holds the motor and the upper part engages around the central part and can be detachably connected to the lower part.

Description

submersible pump

The invention relates to a submersible pump with a housing which receives a motor and an impeller driven by the latter and which has a suction opening for sucking liquid and an outlet opening for discharging the liquid.

With the help of such a submersible pump liquid can be pumped out of containers, shafts, rooms in buildings and the like. For this purpose, the submersible pump comprises a housing which can be immersed in the liquid to be pumped and which - preferably at the bottom of the housing - has a suction opening, so that the liquid sucked, set by the impeller under pressure and arranged on the preferably at the top of the housing Outlet can be discharged. A pressure line, for example a pressure hose, can be connected to the outlet opening. Such submersible pumps are known, for example, from International Publication WO 03/048584 A1 and from German Utility Model DE 295 08 802 U1.

Object of the present invention is to develop a submersible pump of the type mentioned in such a way that it is inexpensive to install.

This object is achieved in a submersible pump of the generic type according to the invention that the housing has an upper part, a central part and a lower part, which are designed as separate housing parts, wherein the middle part receives the engine and the upper part engages around the middle part and releasably connected to the lower part is connectable.

The construction of the invention allows easy installation of the submersible pump. It can be provided, for example, that in a first assembly step, the motor is inserted into the middle part of the housing. Subsequently, the middle part can be placed with the engine on the lower part and in a further assembly step, the upper part, the center part releasably connected to the lower part, for example, be screwed.

The embodiment of the invention not only allows easy installation of the submersible pump but also a cost-effective production of the housing, which may be configured for example as a three-piece plastic molding. The upper part may surround the middle part in the manner of a clamp. This gives the housing of the submersible pump a high mechanical stability.

It can be provided that the upper part braces the middle part with the lower part. For this purpose, the upper part can have contact surfaces acting on the middle part, preferably on a ceiling wall of the middle part, via which the middle part can be acted upon by a tensioning force in the direction of the lower part.

It is favorable if the lower part surrounds a lower edge of the central part in the circumferential direction. The lower part may for example have an inner shoulder on which the middle part is seated.

In a preferred embodiment, the lower part defines a pumping space, which has the suction opening and in which the impeller is arranged, and the middle part defines a pressure space, which surrounds the motor in the circumferential direction surrounds and which is in flow communication with the pump chamber and the outlet opening. About the suction can be sucked liquid to be pumped into the pump chamber. The rotating impeller conveys the liquid from the pump chamber via the pressure chamber to the outlet opening. Since the pressure chamber surrounds the motor in the circumferential direction, this is effectively cooled by the liquid and engine noise is greatly insulated.

It is expedient if the middle part has an outlet channel which defines the outlet opening and to which a pressure line can be connected. Such a configuration has the advantage that no liquid-carrying flow channels must be provided for the upper part, the liquid can rather be discharged directly from the outlet channel of the middle part. The outlet channel can be designed, for example, in the form of a preferably vertically aligned pressure nozzle. On the outside, the discharge nozzle can carry a thread for screwing on a connection fitting.

In order to mechanically support the outlet channel, it is advantageous if it passes through the upper part.

It can be provided that the upper part forms a retaining ring which engages around the outlet channel.

To ensure that the liquid is pumped correctly, it must be ensured that air in the pressure chamber can be soaked. If there are larger quantities of air in the pressure chamber, there is a risk that the delivery rate of the pump will drop so that even a small amount of Pressure at the outlet opening, as it arises for example by a liquid column in the pressure line or by built-in pressure line check valves can not be overcome. In a preferred embodiment, therefore, the middle part has a vent channel, which can be closed and opened to vent the submersible pump by means of a vent valve. The vent channel is in flow communication with the pressure chamber. It can be provided that the venting channel opens directly into the pressure chamber.

Preferably, the venting channel protrudes into the upper part of the housing, so that the upper part forms a mechanical protection for the venting channel.

The vent valve is in a preferred embodiment can be manually transferred from its closed position to its open position. This has the advantage that can be solved in a simple manner by manual operation encrustations, which can form in a promotion of very dirty liquid in the venting valve. This ensures that the vent valve can be reliably transferred to its open position for venting the submersible pump.

It is advantageous if the venting valve is associated with an actuating element which is preferably arranged on the upper part. The arrangement of the actuating element on the upper part has the advantage that the actuating element is accessible to the user in a simple manner, even if the submersible pump was immersed in a liquid to be pumped. By means of the Actuator, the vent valve can be opened manually by the user. It can be kept in its open position until virtually all the air has escaped from the submersible pump. As a result, a high delivery capacity of the submersible pump can be achieved.

It can be provided that the vent valve can be manually opened by the user and manually closed.

Alternatively it can be provided that the vent valve can be opened manually and that it automatically transitions from its open position to its closed position. For this purpose, the vent valve can be biased by means of a spring element in its closed position. This ensures that the vent valve closes automatically after the user releases the actuator.

Preferably, the actuating element is designed as a push button. This allows a particularly simple operation of the vent valve. The push button can be rigidly coupled to a valve body of the vent valve. Preferably, the pushbutton is integrally connected to the valve body. The valve body may for example be designed as a valve piston, which is arranged displaceably in the vent channel. On the outside, the valve body can carry a sealing ring for tight contact with a sealing surface of the venting channel.

In a particularly preferred embodiment of the submersible pump according to the invention, the middle part above the motor has a liquid-tight Control room for receiving control electronics. For this purpose, the middle part can form an inner wall in the form of a sleeve into which the motor dips, the sleeve defining the control space above the motor. Letzeer can record control electronics to control the motor.

It is advantageous if the inner wall of the middle part is surrounded by an outer wall, so that the middle part is designed double-walled in height of the control room.

The inner wall and the outer wall may protrude from a ceiling wall of the central part in the direction of the lower part. Preferably, the inner wall, the outer wall and the ceiling wall form a common plastic molded part.

In order to transport the submersible pump according to the invention in a simple manner, it is advantageous if the upper part at a distance from the central part has at least one carrying handle, which is encompassed by the user. The at least one carrying handle is arranged above the middle part and gives the user the opportunity to take the submersible pump in a simple manner, so that he can immerse it, for example, in a liquid to be pumped.

In a mechanically particularly resilient embodiment of the submersible pump according to the invention, the upper part has at least one retaining arm, which extends on the outside along the central part and is releasably connectable to the lower part. Preferably, a plurality of holding arms are used, which in particular special above the middle part on carrying handles are integrally connected to each other, because this gives the upper part a particularly high stability.

In a preferred embodiment of the submersible pump according to the invention, the housing is configured substantially triangular in plan view. This allows a particularly compact design of the submersible pump, wherein the middle part can accommodate the usually cylindrical motor which is surrounded by the pressure chamber, and wherein in the corner regions of the housing functional elements of the submersible pump can be arranged, for example flow channels, venting channels and / or level sensors. Such level sensors can be positioned on the outside of the housing and the level of the liquid to be pumped, in which the submersible pump was immersed detect. Depending on the state of the liquid, the submersible pump can be switched on and off by means of the at least one level sensor.

In an advantageous embodiment, the outlet opening is arranged on the upper side in a first corner area of the housing. The outlet opening may be in fluid communication with the pressure space of the central part via an outlet channel, for example a pressure connection, wherein the outlet channel may likewise be positioned in the first corner area of the housing.

In a second corner region of the housing, in a preferred embodiment, an actuating element is arranged on the upper side, which is coupled with a venting valve for venting the submersible pump. As already explained, can be ensured by means of the vent valve that air located in the pressure chamber can escape.

The upper part of the substantially triangular-shaped housing in the plan view preferably forms three retaining arms which each extend in a corner region of the housing along the central part and are releasably connectable to the lower part, for example, can be screwed to the lower part. The support arms each run in a corner region of the housing, which thus receives a particularly high load capacity and shock resistance.

For transporting the submersible pump, it is advantageous in the case of a triangular design of the housing when the upper part forms a substantially triangular support ring in plan view, with three carrying handles which each connect two holding arms to one another. The carrying handles can be arranged at a distance to the central part and, for example, be designed as supporting beams, which can be encompassed by the user in a simple manner.

In order to give the submersible pump according to the invention a high stability, it is advantageous if the lower part has a plurality of distributed over the circumference of the housing arranged feet for setting up the housing on a standing surface. In a triangular configuration of the housing, it is favorable if in each case a base is arranged in a corner region of the housing. This allows a three-point support of the submersible pump, which thus receives a particularly high stability. Between the feet, the lower part can have recesses for sucking the liquid. It is advantageous if the feet are height adjustable, because this gives the opportunity to operate the submersible pump in different modes. In a first mode of operation, the feet may be made relatively short, so that the distance between a suction opening arranged on the underside of the housing and the base is small. The distance may be, for example, less than 2 mm, preferably about 1 mm, in the first mode of operation. In this mode of operation, the base can be sucked dry wipe, that is, the base can be sucked so far that only a thin liquid film remains. In a second mode of operation, by means of the height-adjustable feet, the distance between the intake opening arranged on the underside and the base can be selected to be relatively large. This has the advantage that the flow resistance for sucking the liquid can be very low, so that the submersible pump has a high delivery capacity. In addition, due to an increased distance between the suction opening and the standing area, heavily soiled liquid can be pumped off reliably, since even larger dirt particles can reach the suction opening. The increased distance may be, for example, about 3 mm to about 8 mm.

It is advantageous if the feet have in each case a foot part which is pivotably mounted between a swung-out, the distance between the base and the suction opening position and a pivoted, the distance between the base surface and suction reducing position. The foot parts can be manually swiveled by the user without the need for additional tools got to. Even if, after use of the submersible pump in very dirty liquid form encrustations in the foot parts, they can be removed by manually pivoting the foot parts in a simple manner.

It can be provided that the foot part completely immersed in its pivoted position in a receiving space of the lower part. This has the advantage that the submersible pump can be greatly lowered by the foot is transferred to its pivoted position. In addition, the submersible pump receives by such a configuration an aesthetically pleasing shape, because in the pivoted position, the foot parts are not visible from the outside.

The following description of a preferred embodiment of the invention serves in conjunction with the drawings for further explanation. Show it:

Figure 1: a perspective view of a submersible pump according to the invention with foot parts in the swung-out position;

Figure 2 is an enlarged view of detail A of Figure 1;

Figure 3 is a perspective view of the submersible pump according to the invention with foot parts in the pivoted position;

FIG. 4 shows an enlarged view of detail B from FIG. 3;

Figure 5: a bottom view of the submersible pump with swung-foot parts;

Figure 6 is a bottom view of the submersible pump with pivoted foot parts;

Figure 7: a plan view of the submersible pump;

Figure 8 is a sectional view taken along the line 8-8 in Figure 7 and

Figure 9 is a sectional view of the housing of the submersible pump in the manner of an exploded view.

In the drawing, a submersible pump 10 according to the invention is shown schematically with a housing 12 which is formed as a three-part plastic molding with an upper part 13, a middle part 14 and a lower part 15. As is apparent in particular from Figure 7, the housing 12 in the plan view in Essentially triangular with convexly outwardly curved side surfaces 16, 17 and 18 and formed with substantially planar corner regions 19, 20 and 21. The upper part 13 comprises a support ring 23 which, in plan view, has a substantially triangular shape corresponding to the housing 12 and has three convexly outwardly curved carrying handles 24, 25, 26. The carrying handles 24, 25 and 26 can be gripped by the user and each extend along one side of the triangular shape. Starting from the support ring 23, in the corner regions 19, 20 and 21 of the housing 12 in the direction of the lower part three retaining arms 28, 29, 30 of the upper part 13. The retaining arms 28, 29, 30 extend along the middle part 14 on the outside and with the help of connecting screws 32 (see Figure 8) with the lower part 15 releasably connected. The holding arms 28, 29, 30 and the carrying handles 24, 25, 26 arranged between them form a one-piece plastic molded part.

The middle part 14 of the housing 12 is designed substantially cup-shaped and comprises a top wall 34 which is arranged at a distance from the support ring 23 and from which an outer wall 35 extends downward in the direction of the lower part 15. The outer wall 35 sits with the interposition of a sealing ring 36 on an inner shoulder 37 of the lower part 15. The lower edge of the outer wall 35 is annularly surrounded by the lower part 15. At a distance from the outer wall 35, the middle part 14 has an inner wall 38, which is also integrally connected to the ceiling wall 34 and forms a projecting from the top wall 34 circular cylindrical sleeve. In contrast to the outer wall 35, the inner wall 38 extends in the vertical direction only to an approximately central region of the central part 14th

The lower part 15 forms a retaining ring 40, which surrounds the lower edge of the central part 14. In addition, the lower part 15 has three each arranged in a corner region 19, 20 and 21 feet 41, 42, 43, with which the submersible pump 10 can be placed on a standing surface 44 shown in Figure 8. The stand 44 facing the free end portion of the feet 41, 42 and 43 is formed in each case by a pivotally mounted foot part 45, 46 and 47, which between a swung out, in the Figures 1, 2, 5 and 8 shown position and a pivoted, in the figures 3, 4 and 6 shown position can be manually pivoted back and forth. As can be seen in particular by comparing Figures 2 and 4, the length of the feet 441, 42 and 43 can be increased by swinging the foot parts 45, 46 and 47.

On the inside, the lower part 15 defines the feet 41, 42 and 43 immediately adjacent respectively a receiving space 48, 49 and 50, in which the respective foot part 45, 46 and 47 can be pivoted. The receiving spaces 48, 49 and 50 take the foot parts 45, 46 and 47 in their pivoted position completely, so that they are no longer recognizable from the outside. This becomes clear in particular from FIGS. 3 and 4.

The feet 41, 42 and 43 surround a suction trough 52 of the lower part 15, which has a suction opening 54 in a central region. The suction port 54 may be covered by a screen or a grid. If the foot parts 45, 46 and 47 assume their pivoted-in position, then the suction opening 54 is arranged at a very small distance from the standing surface 44, for example at a distance of approximately 1 mm. If the foot parts 45, 46, 47 assume their swung-out position, then there is an increased distance between the suction opening 54 and the standing surface 44, the distance can then be, for example, about 3 to 8 mm. This gives the possibility to reliably suck even heavily contaminated liquid with coarse dirt particles, whereas the base 44 can be sucked out to very small liquid residues when the foot parts 45, 46, 47 occupy their pivoted position.

Between the lower part 15 and the middle part 14, an intermediate wall 56 is arranged within the housing 12, which forms a support collar 57 on the upper side and which has a central passage opening 58. The intermediate wall 56 and the suction trough 52 surround a pumping space 59, in which an impeller 60 is arranged.

The central part 14 receives a motor 62, which is encapsulated in a motor housing 63. The motor housing 63 protrudes into an inner space of the central part 14 surrounded by the circular cylindrical inner wall 38, wherein the motor housing 63 is supported with the interposition of a sealing ring 64 on a support ring 65, which is fixed on the free edge of the inner wall 38. On the underside, the motor housing 63 is supported on the support collar 57 of the intermediate wall 56, and a motor shaft 67 passes through the passage opening 58 of the intermediate wall 56. On the motor shaft 67, the impeller 60 is held against rotation.

The motor housing 63 is surrounded within the middle part 14 by an annular pressure chamber 70, which communicates with the pumping space 59 via flow openings, not shown in the drawing. In the area of the ceiling wall 34, a pressure port 72 connects to the pressure chamber 70 in a first corner region 19 of the housing 12, which protrudes upward in the vertical direction via the support ring 23 and carries an external thread 73 in its projecting end region. The discharge nozzle 72 is integrally connected to the central part 14 and defines an outlet opening 75 of the submersible pump 10. In a second corner region 20 extends from the top wall 34 of the central part 14, a ventilation channel 77 which is integrally connected to the central part 14. Above the ventilation channel 77, the upper part 13 forms a guide shaft 79 into which an actuating element in the form of a pushbutton 80 dips. As can be seen in particular from FIG. 7, the pushbutton 80 is configured substantially triangular in plan view and arranged between two carrying handles 24, 25. It is designed in the manner of a cap and integrally connected on its underside with a valve body in the form of a hollow cylindrical valve piston 83. The valve piston 83 dips into the venting channel 67, which forms in its upper end region on the inside a sealing surface 84 with a reduced diameter. In the area of the sealing surface 84, the valve piston 83 carries on the outside a sealing ring 85, which is pressed under the action of a compression spring 87 sealingly against the sealing surface 84. The compression spring 87 is clamped between the pushbutton 80 and the end face of the venting channel 67. Elastic locking lugs 88, which are arranged on the underside of the push button 80 and cooperate with corresponding recesses of the upper part 13, ensure that the push button 80 under the action of the compression spring 87 can not be pushed out of the guide shaft 79.

The sealing surface 84 forms in cooperation with the valve piston 83 and the sealing ring 85 from a vent valve 90 which can be actuated by means of the push-button 80. Starting from the closed position shown in Figure 8, the vent valve 90 can be converted by pressing the push button 80 against the action of the compression spring 87 in its open position, so that air located in the pressure chamber 70 can escape from the housing 10 via the venting channel 77.

The installation of the submersible pump 10 is relatively simple. In a first assembly step, the encapsulated motor 62 can be inserted into the region of the middle part 14 surrounded by the inner wall 38. The motor together with the motor housing 63 can then be fixed by means of the support ring 65 on the central part 13, which is ensured by the sealing ring 64 that in the surrounded by the inner wall 38 interior of the central portion 14 above the motor housing 63 no liquid can penetrate. The area arranged above the motor housing 63, which is surrounded by the inner wall 38, forms a control chamber 92, which can accommodate a control electronics, not shown in the drawing, known per se. The control electronics is inserted into the control chamber 92 before the motor 62 with the motor housing 63 closes the control chamber 92 on the underside.

In a further assembly step, the intermediate wall 56 can be placed with the support collar 57 on the motor housing 63 and then the impeller 60 can be fixed to the end wall of the motor shaft 67 passing through the intermediate wall 56. The middle part 14 with the motor 62 held therein and the intermediate wall 56 can then be placed on the inner shoulder 37 of the lower part 15, and in a further assembly step, the upper part 13 can be placed on the central part 14 and screwed to the lower part 15. The upper part 13 braces the central part 14 with the lower part 15 and receives with a retaining ring 94 the discharge nozzle 72 of the middle part, wherein the free end region of the pressure nozzle 72 with the outer thread 73 projects above the retaining ring 94. When placing the upper part 13 of the ventilation channel 77 dives into a receptacle 96 of the upper part 13, which is formed by an annular wall 97, which is arranged in the second corner portion 20 of the housing 12. To the annular wall 97, the upper side of the guide shaft 79 connects, in which the push button 80 can be inserted from above, wherein it is locked by means of the locking lugs 88 with the upper part 13. The upper part 13 can then be placed on the middle part 14 with the interposition of the compression spring 87.

By means of the submersible pump 10, a container, such as a shaft, a building room or a garden pond, can be pumped out. For this purpose, the submersible pump 10 can be immersed in the liquid to be pumped. When the motor 62 is started, the impeller 60 is rotated and liquid is sucked into the pumping space 59 via the suction opening 54 and discharged therefrom via the pressure space 70 under pressure to the outlet opening 75. A pressure line, for example a pressure hose, can be connected to the outlet opening 75 in a customary manner by means of the external thread 73. If the submersible pump 10 is to be vented, the user can actuate the pushbutton 80 for this purpose so that the venting valve 90 changes into its open position. During operation of the submersible pump 10, the motor 62 is effectively cooled by the liquid present in the pressure chamber 70 and at the same time the liquid causes an effective insulation of the engine noise.

Due to the triangular shape, the housing 12 can be made very compact, since despite the usually cylindrical configuration of the motor 62 and the motor housing 63 functional elements of the submersible pump in the corner regions 19, 20 and 21 and in the control chamber 92 can be positioned without the housing must have outwardly projecting housing sections.

Claims

A submersible pump having a housing accommodating a motor and an impeller driven thereby and having a suction port for sucking liquid and an outlet port for discharging the liquid, characterized in that the housing (12) has an upper part (13) Central part (14) and a lower part (15) which are designed as separate housing parts, wherein the central part (14) receives the motor (62) and the upper part (13) surrounds the central part (14) and with the lower part (15). is detachably connectable.

2. submersible pump according to claim 1, characterized in that the lower part (15) defines a pumping space (59) having the suction opening (54) and in which the impeller (69) is arranged, and that the central part (14) has a pressure chamber (70) surrounding the motor (62) and in fluid communication with the pumping chamber (59) and the outlet port (54).

3. Submersible pump according to claim 1 or 2, characterized in that the central part (14) has an outlet channel (72) which defines the outlet opening (75) and to which a pressure line can be connected.

4. submersible pump according to claim 3, characterized in that the outlet channel (72) passes through the upper part (13).

5. submersible pump according to claim 3 or 4, characterized in that the upper part (13) has a retaining ring (94) which engages around the outlet channel (72).

6. Submersible pump according to one of the preceding claims, characterized in that the central part (14) has a vent channel (77) for venting the submersible pump (10) by means of a vent valve (90) is selectively closed and opened.

7. submersible pump according to claim 6, characterized in that the vent valve (90) is manually transferred from its closed position to its open position.

8. submersible pump according to claim 6 or 7, characterized in that the venting valve (90) is associated with an actuating element (80).

9. submersible pump according to claim 8, characterized in that the actuating element is designed as a push-button (80).

10. submersible pump according to one of the preceding claims, characterized in that the central part (14) above the motor (62) has a liquid-tight control chamber (92) for receiving control electronics.

11. submersible pump according to one of the preceding claims, characterized in that the upper part (13) at a distance from the central part (14) min-

at least one carrying handle (24, 25, 26) which can be grasped by the user.

12. Submersible pump according to one of the preceding claims, characterized in that the upper part (13) at least one holding arm (28, 29, 30) which extends on the outside of the central part (14) along and with the lower part (15) is releasably connectable ,

13. Submersible pump according to one of the preceding claims, characterized in that the housing (12) in the plan view is designed substantially triangular.

14. submersible pump according to claim 13, characterized in that in a first corner region (19) of the housing (12) on the upper side, the outlet opening (75) is arranged.

15. submersible pump according to claim 13 or 14, characterized in that in a second corner region (20) of the housing (12) on the upper side an actuating element (80) is arranged, which is coupled with a vent valve (90) for venting the submersible pump.

16. submersible pump according to claim 13, 14 or 15, characterized in that the upper part (13) has three retaining arms (28, 29, 30), each in a corner region (19, 20, 21) of the housing (12) on Extend central part (14) along and releasably connectable to the lower part (15).

17. submersible pump according to claim 16, characterized in that the upper part (13) in a plan view substantially triangular support ring (23) formed with three carrying handles (24, 25, 26), each having two retaining arms (28, 29, 30) connect with each other.

18. submersible pump according to one of the preceding claims, characterized in that the lower part (15) has a plurality of circumferentially of the housing (12) distributed arranged feet (41, 42, 43) for erecting the housing (12) on a standing surface (44 ).

19. submersible pump according to claim 18, characterized in that the feet (41, 42, 43) are height adjustable.

20. submersible pump according to claim 18 or 19, characterized in that the feet (41, 42, 43) each have a foot part (45, 46, 47) which, between a swung out, the distance between the base (44) and the suction port (54) increasing position and a pivoted, the distance between the base surface (44) and the suction port (54) reducing position back and forth is pivotally mounted.

21 submersible pump according to claim 20, characterized in that the foot part (45, 46, 47) in its pivoted position completely in a receiving space (48, 49, 50) of the lower part (15) is immersed.