Classifications

• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D15/00—Control, e.g. regulation, of pumps, pumping installations or systems
  • F04D15/02—Stopping of pumps, or operating valves, on occurrence of unwanted conditions
  • F04D15/0209—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid
  • F04D15/0218—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the working fluid the condition being a liquid level or a lack of liquid supply
• • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
  • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
  • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
  • F04D13/00—Pumping installations or systems
  • F04D13/02—Units comprising pumps and their driving means
  • F04D13/06—Units comprising pumps and their driving means the pump being electrically driven
  • F04D13/08—Units comprising pumps and their driving means the pump being electrically driven for submerged use
  • F04D13/086—Units comprising pumps and their driving means the pump being electrically driven for submerged use the pump and drive motor are both submerged

Definitions

• the invention relates to a Schuimmerscha Iter, as is required in particular for submersible pump units with an electric motor and a coupled, immersed in the pumped pump and a level-dependent motor that can be switched on and off.
• a Schuimmerscha Iter as is required in particular for submersible pump units with an electric motor and a coupled, immersed in the pumped pump and a level-dependent motor that can be switched on and off.
• Pump units of the type mentioned are generally provided with switching devices which are controlled by a float which can be raised and lowered on the outside of the pump housing.
• the float can be connected to the pump housing via a swivel arm or can sit at the end of a flexible cable that is firmly connected to the housing. In both cases the swimmer needs to move
• the invention is based on the object of providing a float switch which, in the first place, allows the switching accuracy and switching reliability of conventional float switches to be increased and can easily be attached to pumps or pump units at the same time without significantly increasing the bulk of such devices.
• the invention provides for solving this problem in a float switch of the type mentioned, which can be used in particular for pump units of the type mentioned above and has a buoyancy body or float controlling an electrical switch, that the buoyancy body or float relates to one on the Auftri ebsricht comparatively large-volume lower part of short length and an attached upper part with small cross-sectional dimensions compared to its length.
• Such a float can be formed from two preferably coaxial cylindrical bodies, one of which has a large diameter compared to its length, while the other has a length that exceeds the diameter many times over.
• the elongated float part can be in direct contact with the actuating element of an electrical switch that can be controlled by pressure, such as the switching lever of a microswitch, and can control it directly by itself serving as a control key.
• the float is therefore not only a buoyancy element but also a control element for the switch of the switch.
• the main buoyancy is applied by the large-volume lower part and the elongated upper part allows an increased switching accuracy to be achieved.
• Such training favors an exact position of the switching points.
• An exact setting of the switching points for the switching on and off device of the connected device can also be influenced by giving the elongated part of the float body with the small cross-sectional dimensions sections with different cross-sectional dimensions adapted to the respective requirements, which are distributed over its length.
• a rod-like part which serves as an actuating key for the electrical switch of the device, which is preferably designed as a hollow body, and on this rod-shaped part On additional drive body slidably and preferably arrange clampable.
• the buoyancy body or float should expediently be accommodated in a float switch chamber which is prepared for easy attachment to the housing of a pump unit and has an elongated prismatic shape with small cross-sectional dimensions transverse to the direction of buoyancy of the
• a float switch as described above is also particularly suitable for being integrated into the pump housing in order to keep the accommodation space as small as possible and to avoid any bulkiness.
• Fig. 2 shows the embodiment shown in Fig. 1 in plan
• Fig. 3 shows a modified floor plan.
• a sieve 14 is arranged on the underside of the housing which passes through the pumped medium into the suction chamber 15 upstream of the suction opening 121 of the pump.
• a chamber 16 is arranged laterally next to the chamber accommodating the motor 13 and extends from the suction chamber 15 upwards to the upper end of the pump unit 11.
• a float 17 is arranged, which extends from the suction chamber 15 into the upper part 111 of the pump housing 11.
• this float In relation to the direction of buoyancy, this float has a short, large-volume part 171 with large cross-sectional dimensions, which is located in the suction chamber of the pump, and an elongated part 172 with small cross-sectional dimensions, which serves as an actuating key for a switching device 19.
• This switching device 19 is housed in the upper part 111 of the pump housing 11 and has a release lever 191, against which the part 172 of the float serving as an actuating plunger bears.
• a float is assumed which is composed of cylindrical parts 171 and 172.
• the float can, as can be seen from the modified plan according to FIG. 3, a shape 37 which deviates from the cylindrical shape in its lower part if the dimensions of the pump unit are to be kept as small as possible.
• the large-volume lower part 171 of the float 17 brings the main lift, while the elongated upper part determines the exact switching point due to its dimensions.
• the switching point can be influenced by making the cross-sectional dimensions of the elongated part 172 different over the length of this part.
• a particularly good and easily adjustable influencing of the switching point can be achieved by means of an additional drive body 173 which is displaceable and clampable on the elongated part 172.
• a further chamber 20 is provided in addition to the float chamber 16 in order to connect the pump outlet to the connection of the delivery line 201.
• This chamber 20 receives a check valve 202 (FIG. 2) or 303 (FIG. 3).

Landscapes

• Engineering & Computer Science (AREA)
• Mechanical Engineering (AREA)
• General Engineering & Computer Science (AREA)
• Control Of Non-Positive-Displacement Pumps (AREA)
• Structures Of Non-Positive Displacement Pumps (AREA)
• Details Of Reciprocating Pumps (AREA)
• Reciprocating Pumps (AREA)

Applications Claiming Priority (2)

Publications (1)

Family

ID=6208324

Family Applications (1)

Country Status (3)

Families Citing this family (5)

Family Cites Families (14)

• 1983
  • 1983-09-06 DE DE19833332050 patent/DE3332050A1/de active Granted
• 1984
  • 1984-09-05 WO PCT/DE1984/000182 patent/WO1985001087A1/de unknown
  • 1984-09-05 EP EP19840903341 patent/EP0153951A1/de not_active Withdrawn

Non-Patent Citations (1)

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