EP2489797A1 - Waste water hoisting facility - Google Patents

Abstract

The system has a reservoir (2), a pump (4), and a vertically movable float arranged in the reservoir. The vertically movable float cooperates with a switch for switching on and off the pump, and is coupled with the switch by telescoping actuating units along a vertical direction. A blocking unit i.e. sleeve, selectively blocks telescopic ability of the actuating units. The switch is arranged inside a sensor housing and actuated by the actuating units over magnetic couplings that are operated through a wall of the sensor housing.

Description

The invention relates to a wastewater lifting plant according to the preamble of claim 1.

Wastewater lifting plants are used to raise sewage, which is at a level below a sewer, to the level of the sewer system. In this case, sewage lifting systems are known, which have a container on or in which a pump is arranged, which pumps the inflowing into the container wastewater from this out to the higher level. To turn the pump on and off a level switch, for example in the form of a float switch is arranged in the container, which turns on the pump when a certain water level in the container and turns off when a second predetermined, lower water level. Depending on the size of the wastewater lifting plant, it is also possible to provide a plurality of pumps which are switched on and off either together or one after the other as a function of different predetermined water levels.

When using mechanical float switches, it is difficult to adjust the water level at which a switching operation is to take place. In particular, it is difficult to realize two switch-on points and a common switch-off point while keeping the setting as simple as possible.

It is therefore an object of the invention to provide a wastewater lifting plant with a container and a vertically movable float, in which can be easily set the water level at which a switching operation to take place.

This object is achieved by a sewage lifting plant having the features specified in claim 1. Preferred embodiments will become apparent from the subclaims, the following description and the accompanying figures.

The wastewater lifting plant according to the invention has, as known wastewater lifting plants on a container which has at least one inlet opening through which wastewater can flow into the container. At least one pump is arranged on or in the container in order to pump the waste water out of the container to a higher level. For switching on and off the pump, a vertically movable float is arranged in the container, which floats on or at the water surface of the water in the container and moves vertically up and down with the water level. This float is coupled to a switch for switching the pump on and off, i. H. For example, mechanically or magnetically connected, so that the pump can be turned on at a predetermined level of water and can be turned off again at a lower water level. As the float floats on the water surface, it moves up and down with the water level and can thus cause the switch to be switched on and off.

In order to achieve an adjustability of the water level at which the pump is turned on, the float is coupled via a vertically telescoping actuating means with the switch for its operation and there is a blocking means for selectively blocking the telescoping of the actuating means. This configuration causes, in the case that the blocking means is not used, in a vertical movement of the float first the actuating means is telescoped, ie telescopically pushed together so that it shortens. In this change in length of the actuating means, the switch remains initially unconfirmed. The switch is then actuated only when the actuating means is fully telescoped, that is completely pushed together to its shortest length. In this way, an upper adjustable water level for switching on the pump can be achieved. With the help of the blocking agent, the telescoping can now be completely or partially blocked, so that the actuating means can no longer collapse or shorten to the full extent in the vertical direction when the float moves vertically upwards with the water surface. Ie. In this case, the actuating means now shortens to a lesser extent, until it can not be further shortened and then actuates the switch. In this way, a lower water level is defined at which the switch is actuated. Thus, by using the blocking means, at least two different levels of water can be defined as switching thresholds for the switch, namely a lower one in which the blocking means is attached to the actuating means and a higher one in which the blocking means is removed. It is also conceivable that different blocking means are provided or the blocking means can be mounted in different positions on the actuating means, so that not the telescoping is completely blocked, but a limited degree of telescoping, but not the full extent is allowed. In this way, further switching thresholds between the complete telescoping and the nonexistent telescoping of the actuating means can be defined. In this way it is basically very easy to define the switching threshold, ie the water level at which the pump is to be switched on.

The switch is preferably located inside a senosor housing and from the actuating means through a wall the sensor housing acting through magnetic coupling actuated. In this embodiment, a direct mechanical coupling between the actuating means and the switch is thus dispensed with. This has the advantage that the sensor housing, in which the electrical and electronic components, as well as the electrical switch are arranged, can be completely sealed at least to the interior of the container, so that water from the interior of the container can not penetrate into the sensor housing. The movement of the float is transmitted via the actuating means by means of a magnetic coupling through a closed wall of the sensor housing on the switch. Thus, for example, the actuating means outside the sensor housing may be connected to a first magnet, which is arranged in the vicinity of the wall of the sensor housing and inside the sensor housing, a second magnet may be arranged so that it is moved when moving the first magnet through this. This second magnet can then be connected to the switch or act on the electrical switch. Alternatively, it is also possible to arrange directly in the sensor housing a magnetic sensor, which is influenced by a magnet on the outside of the sensor. For example, inside the sensor housing, a reed switch could be arranged, which is actuated when the magnet is moved outside the sensor housing by the actuating means in its vicinity.

Preferably, however, it is provided that the actuating means has at least one arranged outside the sensor housing movable first magnet and inside the sensor housing a magnetically coupled to the first magnet second movable magnet is arranged, which cooperates with the switch for its actuation. Ie. Here the second magnet is moved over the first magnet and the second magnet then actuates the switch to turn the pump on and off. The second magnet is relative arranged to the first magnet at least in a switching position so that the magnetic fields of both magnets interact with each other.

More preferably, the float is arranged vertically movable on an actuating rod. Thus, the float with the water level can move vertically up and down while sliding along the actuating rod. The actuating rod ensures that the float can move substantially only in the vertical direction and not transverse to this direction of movement.

According to a further preferred embodiment, a stopper is provided on the actuating rod, against which the float strikes upward during its vertical movement and thus moves the actuating rod in the vertical direction. The actuating rod can then actuate the switch directly or indirectly, for example via the magnetic coupling, by its movement. The relative mobility of the float in the vertical direction to the actuating rod causes the telescoping of the actuating means. The actuating means is formed by the actuating rod, which is telescopic in such a way that the float can move relative to the actuating rod by a certain amount before it abuts against the stop and the actuating rod moves in the vertical direction.

The stopper is further preferably arranged such that the float in its vertically lower position, ie when the water level in the container has a low level, does not abut the stop and is spaced from the stop. This ensures that when a rise in the water level, when the float moves up with this, the float on the operating rod first by a certain degree free can move before it hits the stop. In this way, the above-described telescoping of the actuating means is achieved, float and actuating rod can move first by a certain amount relative to each other before the actuating rod is then moved by the float and operated by their movement the switch.

More preferably, the blocking means is designed in such a way that it can fix the float in its position spaced from the stop on the actuating rod. For this purpose, the blocking agent can be non-positively and / or positively connected to the float and / or the actuating rod. For example, the blocking means may be formed as a clamping means which clamps the float to the operating rod. Also, the fixing could be designed as a locking means or other kind of positive locking element which fixes the float positively on the actuating rod. The fixation of the float on the actuating rod ensures that the float, when lifting vertically with the water level, at the same time moves the actuating rod, since the relative movement between the float and the actuating rod, as described above, is prevented by the blocking means. The fact that the actuating rod is moved directly, this also actuates the switch directly. In this way, then a lower switching threshold is defined at a lower water level, since the switch is actuated earlier in vertical movement of the float with increase of the water level.

The blocking means can preferably be designed as a sleeve surrounding the actuating rod at least partially surrounding it. Thus, the sleeve between the float and the abovementioned stop can be attached to the actuating rod, so that when vertical movement of the float up the movement directly on transmits the stop and the actuating rod is moved over the stop with in the vertical direction. The sleeve may be formed in this arrangement so that it has a length which corresponds to the distance between the float and stop at the lowest water level. Then, the sleeve can be positively placed between the float and stop so that it moves directly on the rise of the water level, the actuating rod on the stop, and thus causes a switch of the switch. However, the sleeve can also be made shorter than the distance between the stop and float at the lowest water level. Then, a certain relative movement between the float and the actuating rod is initially allowed to rise with the water until the float then touches the one axial end of the sleeve and then transmits on further movement this via the sleeve to the stop, so that then moves the actuating rod. Ie. by selecting the sleeve length, the water level can be set at which the switch is to be activated. Characterized in that the sleeve surrounds the actuating rod only part of the circumference, it is possible to put the sleeve in the radial direction on the actuating rod. In this way, a mounting and dismounting of the sleeve is possible without having to remove the float from the operating rod. Thus, the switching level or the switching threshold can be easily adapted to the desired water level by installing and removing the sleeve.

In the embodiment described above, it is provided that the float is vertically movable on the actuating rod. For this purpose, the float may have in its interior a hole or an opening into which the actuating rod engages. Instead of an actuating rod, however, a plurality of actuating rods may be provided, which then engage correspondingly in a plurality of holes or openings of the float. Alternatively, it is also possible that the actuating rod outside the float, ie is arranged laterally thereof, so that the float moves vertically upward along the actuating rod. The float is also preferably guided on the actuating rod. For this purpose, guide elements may be provided on the float. It is also possible to arrange a plurality of actuating rods parallel and spaced from one another so that a cage is formed, in the interior of which the float is movably arranged.

According to a further preferred embodiment, the float, the actuating means and the switch are formed as an assembly inserted into an opening of the container. This assembly thus represents a level or float switch, which can be used as a preassembled unit through an opening in the container and can be preferably fixed in the region of the opening to a container wall. In this way, on the one hand, the assembly of the sewage lifting plant is simplified. On the other hand, it is easily possible for maintenance and repair purposes, the entire assembly, which forms the float switch as a whole to remove from the container and replace or repair. In addition, upon removal of the level switch an opening in a container conversion can be released, which can be used for other maintenance purposes inside the container.

The float and the actuating rod are further preferably arranged within a vertically extending protective sleeve, wherein the protective sleeve is tubular and in each case has at least one opening in the region of its upper and its lower end. These openings may be formed in the axial end faces of the sleeve or else in the peripheral walls in a region adjacent to the axial ends. Particularly simple is the design of the protective sleeve, if at least one, preferably both axial ends are open, so that the protective sleeve as a whole tubular is designed. The protective sleeve surrounds the float and the other elements of the float switch circumferentially and protects it from soiling. In the wastewater entrained dirt could otherwise pollute the float switch and in particular block a possible relative movement between the float and actuator rod. Through the protective sleeve, these contaminants are kept away from the float and the actuating rod and also from the switch.

More preferably, the at least one opening in the region of the upper end of the protective sleeve from the upper end vertically spaced down and formed the upper end of the protective sleeve otherwise closed. In this way, at the upper end of the protective sleeve in the interior of which only a downwardly open volume is formed. This causes, as the water inside the protective sleeve rises, when the water level reaches the top of the opening, an air volume is trapped inside the protective sleeve in the upper end. This prevents the water inside the protective sleeve from coming into direct contact with the upper end. At the upper end of the switch can be arranged for example in a sensor housing. The described air cushion or trapped air volume prevents this switch and / or mechanical components interacting with the switch from coming into direct contact with the wastewater. Thus, on the one hand electrical errors can be prevented by moisture and on the other hand, the switch blocking dirt can be prevented. This is especially true if the container, for example due to malfunction of the pump, should inadvertently completely run completely. Even then are protected by the trapped air volume at the upper end of the protective sleeve of the switch and / or cooperating with the switch components from direct contact with the wastewater.

The opening in the region of the lower end of the protective sleeve is expediently arranged in such a way that it is located below the minimum water level in the container during operation of the sewage lifting unit. This ensures that the lower end of the protective sleeve is always immersed in the water. The inlet opening in the container, through which the waste water flows into the container, is arranged outside the protective sleeve, so that the waste water flows into a region of the container which surrounds the protective sleeve on the outer circumference. By dipping the protective sleeve is thereby ensured that light soiling, which float on the water surface, such as grease, oil and foams, are held in the protective sleeve surrounding area and can not enter the interior of the protective sleeve. Thus, by the protective sleeve arranged in the interior of the protective sleeve float and the other components of the float switch thus formed protected from these floating on the water surface impurities. In this way, these contaminants can not affect the function of the float switch, for example, do not block the movement of the float relative to the actuating rod. In addition, turbulence in the water, for example by incoming water, kept away from the float.

The switch and possibly a magnet for actuating the switch are, as described above, preferably located above the at least one opening in the region of the upper end of the protective sleeve. Thus, the movement of the float on the switch transmitting components and the switch itself are protected by the enclosed air cushion from direct contact with the wastewater. In this way, a high reliability is achieved because impurities in the wastewater can not affect these elements in their function.

Fig. 1

eine Schnittansicht durch eine erfindungsgemäße Abwasserhebeanlage,

Fig. 2

eine Detailansicht des Niveauschalters,

Fig. 3

eine Schnittansicht des Niveauschalters gemäß Fig. 2,

Fig. 4

eine Ansicht des Niveauschalters gemäß Fig. 2 mit abgenommenem Schutzrohr,

Fig. 5

eine Schnittansicht des oberen Endes des Niveauschalters in einer ersten Schaltposition des Niveauschalters und

Fig. 6

eine Schnittansicht gemäß Fig. 5 in einer zweiten Schaltposition und

Fig. 7

eine Draufsicht auf den Niveauschalter mit geöffnetem Sensorgehäuse.

The invention will now be described by way of example with reference to the accompanying drawings. In these shows:

Fig. 1

a sectional view through a wastewater lifting plant according to the invention,

Fig. 2

a detailed view of the level switch,

Fig. 3

a sectional view of the level switch according to Fig. 2 .

Fig. 4

a view of the level switch according to Fig. 2 with removed protective tube,

Fig. 5

a sectional view of the upper end of the level switch in a first switching position of the level switch and

Fig. 6

a sectional view according to Fig. 5 in a second switching position and

Fig. 7

a plan view of the level switch with open sensor housing.

The wastewater lifting plant according to the invention has a container 2 with at least one inlet opening, not shown here. Through the inlet opening to be lifted or pumped wastewater can flow into the container 2. In the container 2, a pump unit 4 is arranged, which serves to pump the wastewater from the container 2 out in a higher-lying sewer or sewer. For this purpose, the pump unit 4 is connected at its discharge connection to an outlet line 6, which leads to an outlet connection 8 in the interior of the container 2. In the example shown here are two outlet ports 8 provided, which serve for alternative connection of a pressure or sewer line. In the container 2, a level sensor or level switch 10 is also arranged. About the level switch 10, the height of the water level is detected in the container 2 and the pump 4 on and off depending on the water level. For example, there is an upper water level, in which the pump unit 4 is turned on and a lower lower water level at which the pump unit is switched off again. The water level for switching on and off can also be the same water level. Ie. the pump unit 4 is turned on when this water level is exceeded and turned off when falling below.

The level switch 10 is, as shown by the FIGS. 2 to 7 will be explained in detail, designed as a float switch. The level switch 10 has on the outside a tubular protective sleeve 12, which surrounds a float 14. The float 14 is movable in the interior of the protective sleeve 12 in the vertical direction X. The protective sleeve 12 is tubular and has an open lower end 16. At its upper end, the protective sleeve 12 is connected to a sensor housing 18. The sensor housing 18 closes the upper end of the protective sleeve 12. Vertically spaced from the adjacent to the sensor housing 18 upper end of the protective sleeve 12 openings 20 are formed in the peripheral wall. The openings 20 serve for venting, so that air can escape from the protective sleeve 12 when water enters the protective sleeve 12 from the lower end 16. The protective sleeve 12 is defined by its length so that its lower end 16 is located in the container preferably below the minimal water level 22 occurring during operation of the sewage lifting unit. This ensures that the opening at the lower end 16 of the protective sleeve 12 is always under water. Now, when waste water flows into the container 2, so that impurities, which on the Float water surface, such as oil and foam, can enter from below into the protective sleeve 12. In this way, the interior of the protective sleeve 12 is protected from contamination, which could affect the movement of the float 14.

The openings 20 are spaced from the upper end of the protective sleeve 12 by a measure a. This has the advantage that, if the water in the container 2 should rise above the level of the openings 20, for example because the pump unit 4 is defective or is not turned on due to a sensor error, the water in the interior of the protective sleeve 12 substantially no further than may rise above the top edge of the openings 20. The space located above the openings 20 in the interior of the protective sleeve 12 is completely closed at the top and peripherally, so that the air volume present there is trapped as the water rises up to the upper edge of the openings 20. This trapped air volume then prevents the water inside the protective sleeve 12 from rising even higher. In this way, the wastewater is prevented from coming into contact with the sensor housing 18 inside the protective sleeve 12. Thus, the essential components of the level switch, namely the actual switch on and in the sensor housing 8 are reliably protected against contact with the waste water, even in the event of malfunction, so that contamination of these more sensitive components can be prevented.

The protective sleeve 12 moreover has the advantage that it keeps away turbulences from the float 14 when the water flows into the container 2. For example, when flowing in the water a kind of shaft 24 may form, which could then lead to a sudden short-term floating of the float 14 and thus to an unintentional switching on of the pump assembly 14. By the protective sleeve 12, the liquid is calmed in the interior and kept free of such turbulence, so that malfunction of the level switch 10 due to such turbulence can be prevented.

The float 14 is designed as a closed hollow body so that it experiences buoyancy in the water and floats on the water surface. The float 14 is traversed by a vertical through hole 26. This through-hole 26 is formed by a tubular wall which, together with the outer walls of the float 14, encloses an annular air volume 28. For example, instead of having an enclosed air volume 28, the float 14 could be formed of a foam material that is buoyant and buoyant enough.

Through the through hole 26, an actuating rod 30 extends therethrough. The float 14 is movably guided on this actuating rod 30 in the vertical direction X. At its lower end, the actuating rod 30 radially projecting resilient tongues 32, which prevent the float 14 can slide down from the operating rod 30. The tongues 32 are arranged so that a kind of barbs form and the float 14 can be pushed onto the actuating rod 30 from below and the tongues 32 move radially inwards and rest on the actuating rod 30. After sliding the float 14, the tongues 32 move outwardly again due to their spring force and thus prevent the float 14 from being removed again by the actuating rod. At its upper end, the actuating rod 30 is guided in a vertically extending sleeve 34 in the sensor housing 8. The sleeve 34 is completely closed and forms part of a wall of the sensor housing 8, so that the interior of the sleeve 34 is sealed by the wall of the sleeve relative to the interior 36 of the sensor housing 8. The sleeve 34 is in this Example integrally formed with the wall 38 of the sensor housing 8, which forms the underside of the sensor housing 8, which closes the end face of the protective sleeve 12. In this way it is ensured that the interior 36 of the sensor housing 8 is completely sealed with respect to the interior of the protective sleeve 12, so that moisture from the interior of the container 2 and in particular from the interior of the protective sleeve 12 can not penetrate into the interior of the sensor housing 8.

The sensor housing 8 is preferably inserted into an opening in a wall of the container 2, wherein the circumferentially applied to the sensor housing 8 seal 40 comes sealingly against the wall of the container 2 to the plant. Thus, the opening in the wall is completely sealed when the level switch 10 is inserted.

The actuating rod 30 carries at its upper end, which hineinerstreckt into the sleeve 34, a permanent magnet 42. The permanent magnet 42 is movable with the actuating rod 30 in the vertical direction in the sleeve 34.

Inside the sensor housing 8, the electrical switch 44 is arranged. The electric switch 44 can be actuated via a fork-shaped arm 46, which can be pivoted about a pivot axis 48 in the horizontal plane. The two legs 50 of the fork-shaped arm do not extend parallel but at an acute angle to each other. The two legs 50 each carry a permanent magnet, one leg 50 the permanent magnet 52 and the other leg 50, the permanent magnet 54. The arm 46 with the legs 50 is configured and pivotable about the pivot axis 48 that in the in Fig. 7 shown rest position of the permanent magnet 52 is located on the outer wall of the sleeve 34. In the second pivot position, this permanent magnet 52 is removed from the sleeve 34 and the second permanent magnet 54 is located on the opposite outer side of the sleeve 34th

The actuating rod 30 is so movable with its permanent magnet in the sleeve 34 that, when the actuating rod 30 moves vertically upward, its permanent magnet 42 is moved between the permanent magnets 52 and 54. In this case, the permanent magnet 54 is arranged such that its magnetic south pole or its magnetic negative pole faces the magnetic north pole or positive pole of the permanent magnet 42. The permanent magnet 52 is arranged exactly the opposite way, so that its magnetic south or negative pole faces the south or negative pole of the permanent magnet 42. This causes that, when the permanent magnet 42 is displaced vertically by moving the operating rod 30 between the permanent magnets 52 and 54, the permanent magnet 54 is attracted to the permanent magnet 42, while the permanent magnet 52 is repelled by the permanent magnet 42. This leads to a pivoting of the fork-shaped arm 46 about the pivot axis 48 and thus to an actuation of the electrical switch 44. When the permanent magnet 42 is again moved out of the gap between the permanent magnet 52 and 54 in the vertical direction, the arm moves 46, for example, by the restoring force of a spring, not shown here in the in Fig. 7 shown initial position, whereby the switch 44 is moved back to its first switching position. The operation of the switch 44 can be used to turn on and off the pump unit 4. It is advantageous that all electrical components of the electrical switch 44 are arranged in the interior of the sensor housing 8 and the sensor housing 8 can be formed completely closed, since no moving components have to be led out of this. The Motion transmission takes place magnetically through the wall of the sensor housing 8, ie through the wall of the sleeve 34 therethrough.

The movement of the operating rod 30 in the vertical direction is caused by the float 14. It is provided according to the invention that two different switching thresholds for the actuation of the switch 44 can be optionally defined. A first higher switching threshold, ie at a higher water level in the container 2 by the in Fig. 4 achieved constellation reached. The float 14 is initially freely movable in the vertical direction on the actuating rod 30, so that it initially moves on the actuating rod 30 in the vertical direction when the water level rises. Only when the float 14 abuts with its upper side against the stop 56, the actuating rod 30 is moved by the float 14 in the vertical direction upwards and the permanent magnet 42 is moved between the permanent magnets 52 and 54 in the manner described above. The stop 56 projects in the radial direction from the actuating rod 30, so that the float 14 with its end face surrounded by the through hole 26 can abut against this stop 56. Ie. the stop 56 has an extension in the radial direction which is greater than the diameter of the through hole 26.

In order to define a lower switching threshold, ie to realize an actuation of the switch 44 already at a lower water level in the container 2, can on the actuating rod 30 as in Fig. 4 shown, a blocking agent in the form of a sleeve 58 are attached. The sleeve 58 has a vertical length such that it can be inserted between the top of the float 14 and the stop 56. In this case, the sleeve 58 surrounds the actuating rod 30 part of the circumference and is preferably fixed in a form-fitting manner, for example by a latching connection. The sleeve 58 has such a radial extent on that it comes to the surrounding the through hole 26 end face of the float 14 and the stop 56 to the plant. By the sleeve 58 thus the relative movement of the float 14 is blocked to the actuating rod 30, so that the float 14, the actuating rod 30 moves earlier in its vertical movement or moved along. By the vertical length of the sleeve 58, the level of the water level can be defined, in which the float 14, the actuating rod 30 in vertical upward movement. Thus, it is possible to form the sleeve 58 so long that the float 14 is fixed in its lowermost position on the operating rod 30, as in the sectional view in FIG Fig. 3 shown. In this position, the float 14 then abuts the tongues 32 at its lower end. Alternatively, it is conceivable to use a shorter sleeve 58, which still allows a certain amount of relative movement of the float 14 to the actuating rod 30 in the vertical direction X, before the float 14 to the lower end of the sleeve 58, which with its upper end to the stop 56 abuts, abuts and then the actuating rod 30 moves vertically upwards.

By attaching or clipping the blocking agent in the form of the sleeve 58 to the actuating rod 30, it is therefore possible to adjust the switching threshold or the water level at which the switch 44 is actuated.

If the sleeve 58 is not placed on the actuating rod 30, forms the actuating rod 30 together with the through hole 26 in the interior of the float 14 a telescopic actuating means, which initially collapses vertically when floating the float 14, ie the actuating rod penetrates further into the interior of the Float 14, before the switch 44 is actuated.

LIST OF REFERENCE NUMBERS

2

container

4

pump unit

6

outlet pipe

8th

outlet

10

Nivauschalter

12

protective sleeve

14

swimmer

16

lower end

18

sensor housing

20

openings

22

minimal stand

24

wave

26

Through Hole

28

air volume

30

actuating rod

32

tongues

34

shell

36

inner space

38

wall

40

poetry

42

permanent magnet

44

electrical switch

46

poor

48

swivel axis

50

leg

52, 54

permanent magnets

56

attack

58

shell

a

distance

X

vertical direction

Claims (14)

Waste water lifting system comprising a container (2), at least one pump (4) and in the container (2) arranged vertically movable float (14) connected to a switch (44) for switching on and off of the pump (4) cooperates, characterized marked that
the float (14) is coupled to the switch (44) via a vertically telescoping actuating means (26, 30) and blocking means (58) for selectively blocking telescoping of the actuating means (26, 30) are provided. Wastewater lifting plant according to claim 1, characterized in that the switch (44) is arranged inside a sensor housing (18) and is actuated by the actuating means (30) via a magnetic coupling (42, 42) acting through a wall (34) of the sensor housing (18). 52, 54) is actuated. Wastewater lifting plant according to claim 2, characterized in that the actuating means (30) at least one outside the sensor housing (18) arranged movable first magnet (42) and in the interior of the sensor housing (18) with the first magnet (42) magnetically coupled second movable Magnet (52, 54) is arranged, which cooperates with the switch (44) for its actuation. Wastewater lifting plant according to one of the preceding claims, characterized in that the float (14) is arranged to be vertically movable on an actuating rod (36). Wastewater lifting plant according to claim 4, characterized in that on the actuating rod (30) there is a stop (36) on which the float (14) strikes upwards in its vertical movement and thus the actuating rod (30) in the vertical direction (X) moved. Wastewater lifting plant according to claim 5, characterized in that the stop (56) is arranged such that the float (14) in its vertically lower position does not abut against the stop (56) and is attacked by the stop (56). Sewage lifting plant according to claim 6, characterized in that the blocking means (58) is adapted to fix the float (14) in its spaced from the stop (56) position on the actuating rod (30). Wastewater lifting plant according to claim 7, characterized in that the blocking means (58) as a the actuating rod (30) at least partially surrounding sleeve (58) are formed. Wastewater lifting plant according to claim 7 or 8, characterized in that the blocking means (58) is positively and / or non-positively fixed to the actuating rod (30) and / or the float (14). Sewage lifting plant according to one of the preceding claims, characterized in that the float (14), the actuating means (30) and the switch (44) form a structural unit inserted into an opening of the container (2). Wastewater lifting plant according to one of the preceding claims, characterized in that the float (14) and the actuating rod (30) within a vertically extending protective sleeve (12) are arranged, wherein the protective sleeve (12) is tubular and in the region of its upper and lower end (16) each having at least one opening. Wastewater lifting plant according to claim 11, characterized in that the at least one opening (29) in the region of the upper end from the upper end is vertically downwardly spaced and the upper end of the protective sleeve (12) is formed closed. Wastewater lifting plant according to claim 11 or 12, characterized in that the opening in the region of the lower end (16) of the protective sleeve (12) is arranged such that it is located in the operation of wastewater lifting system below the minimum water level (22) in the container (2) is. Wastewater lifting plant according to claim 12 or 13, characterized in that the switch (44) and optionally at least one magnet (42) for actuating the switch (44) located above the at least one opening (20) in the region of the upper end of the protective sleeve (12) are.

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