CN118224103A - Method for identifying and/or classifying blockages of a discharge pump - Google Patents
Method for identifying and/or classifying blockages of a discharge pump Download PDFInfo
- Publication number
- CN118224103A CN118224103A CN202311705487.9A CN202311705487A CN118224103A CN 118224103 A CN118224103 A CN 118224103A CN 202311705487 A CN202311705487 A CN 202311705487A CN 118224103 A CN118224103 A CN 118224103A
- Authority
- CN
- China
- Prior art keywords
- slope
- curvature
- motor
- value
- time curve
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 238000000034 method Methods 0.000 title claims abstract description 81
- 239000002351 wastewater Substances 0.000 claims abstract description 79
- 239000010865 sewage Substances 0.000 claims abstract description 64
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 28
- 230000001133 acceleration Effects 0.000 claims description 17
- 239000013505 freshwater Substances 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims 1
- 239000012530 fluid Substances 0.000 description 10
- 230000006870 function Effects 0.000 description 9
- 238000011161 development Methods 0.000 description 7
- 238000010586 diagram Methods 0.000 description 4
- 239000007787 solid Substances 0.000 description 4
- 230000008859 change Effects 0.000 description 3
- 239000007788 liquid Substances 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000006399 behavior Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 239000002023 wood Substances 0.000 description 2
- 238000012935 Averaging Methods 0.000 description 1
- 229910001018 Cast iron Inorganic materials 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 239000000356 contaminant Substances 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 210000003608 fece Anatomy 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000009499 grossing Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 230000007257 malfunction Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000013049 sediment Substances 0.000 description 1
- 239000010802 sludge Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000008399 tap water Substances 0.000 description 1
- 235000020679 tap water Nutrition 0.000 description 1
- 239000004753 textile Substances 0.000 description 1
- 230000001960 triggered effect Effects 0.000 description 1
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
- F04D7/00—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts
- F04D7/02—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type
- F04D7/04—Pumps adapted for handling specific fluids, e.g. by selection of specific materials for pumps or pump parts of centrifugal type the fluids being viscous or non-homogenous
-
- E—FIXED CONSTRUCTIONS
- E03—WATER SUPPLY; SEWERAGE
- E03F—SEWERS; CESSPOOLS
- E03F5/00—Sewerage structures
- E03F5/22—Adaptations of pumping plants for lifting sewage
-
- 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
-
- 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
- F04D15/0245—Stopping of pumps, or operating valves, on occurrence of unwanted conditions responsive to a condition of the pump
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04D—NON-POSITIVE-DISPLACEMENT PUMPS
- F04D29/00—Details, component parts, or accessories
- F04D29/70—Suction grids; Strainers; Dust separation; Cleaning
- F04D29/708—Suction grids; Strainers; Dust separation; Cleaning specially for liquid pumps
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Control Of Non-Positive-Displacement Pumps (AREA)
Abstract
The subject of the invention is a method for identifying and/or classifying blockages of a sewage pump (1) having: a pump housing (2), a shaft (4) arranged in the pump housing (2), an impeller (6) located at the shaft (4); and a motor (5) driving the shaft (4), the method having the steps of: during the transport of waste water by means of the sewage pump (1) by operating the motor (5) in a first rotational direction, at least the slope and/or curvature of a time curve representing the electrical waste water operating value of the rotating motor (5) is acquired; and releasing the obstruction by operating the motor (5) at least in a second direction of rotation opposite to the first direction of rotation when the slope and/or curvature of the time profile of the electric waste water operating value exceeds the obstruction threshold.
Description
Technical Field
The invention relates to a method for identifying and/or classifying blockages of a sewage pump, comprising: a pump housing having a shaft disposed therein, an impeller located at the shaft; and a motor driving the shaft, the method utilizing the step of releasing the obstruction by operating the motor in at least a second direction opposite the first direction. The invention also relates to a sewage pump having: a pump housing having a shaft disposed therein, an impeller located at the shaft; a motor of the drive shaft and a control device, wherein the control device is configured to release the obstruction by operating the motor at least in a second direction opposite to the first direction.
Background
Sewage pumps are known from the prior art and are used for transporting fluids by means of the movement of the impeller rotation. The fluid to be conveyed enters the pump chamber of the sewage pump via the suction opening, is captured by the rotating impeller and is thus conveyed into the pressure sleeve.
Solids contained in the fluid may settle in the impeller area and inside the pump housing and thus adversely affect the hydraulic and/or mechanical efficiency of the sewage pump, leading to clogging and malfunction of the sewage pump.
While various methods for releasing a blockage of a sewage pump are known from the prior art, current practice suggests that these known methods do not desirably protect the sewage pump from damage due to such a blockage, which may not be timely identifiable.
Disclosure of Invention
Starting from this situation, the object of the present invention is to provide a method for releasing a blockage of a sewage pump and a corresponding sewage pump, which allows a faster detection of the blockage and a correspondingly faster action to be taken for the release of the blockage than is possible with the solutions known from the prior art.
The object of the invention is achieved by the features of a method of the invention. In particular, advantageous embodiments are provided.
Accordingly, this object is achieved by a method for identifying and/or classifying blockages of a sewage pump having a pump housing, in particular having an inlet (preferably a suction opening), a shaft arranged in the pump housing; an impeller at the shaft and especially towards the inlet, and a motor driving the shaft, the method having the steps of:
during the delivery of wastewater by means of the wastewater pump by operating the motor in a first rotational direction, obtaining a slope and/or curvature of a time curve characterizing an electric wastewater operating value of the rotating motor; and
When the slope and/or curvature of the time profile of the electric waste water operating value exceeds a particularly predefined blockage threshold value, the blockage is released by operating the motor at least in a second rotational direction opposite to the first rotational direction.
The key point of the proposed teaching, with respect to solutions known from the prior art which attempt to determine a blockage from the time signal of the motor power or torque, is to use the slope and/or curvature of the time curve characterizing the running value of the electric waste water of the rotating motor to determine the blockage. By using these gradient information and/or curvature of the running value of the electric waste water characterizing the rotating motor, a near-term estimate can be obtained to some extent.
In other words, it is possible to estimate how the slope and/or curvature of the time curve of the running value of the electrical waste water will change in the near future (e.g. in the next few milliseconds). In other words, the proposed teachings provide a trend analysis of the running value of the electric waste water representative of the rotating motor, so that a tendency of clogging can be identified within a few milliseconds with respect to the solutions known from the prior art. In this way, a trend is identified, it is possible to react in advance to an impending blockage, thereby reducing or avoiding damage to the sewage pump by the soil. If the mechanical resistance increases and the impeller is not actually clogged, the impeller may become "sluggish" over time. According to the methods known from the prior art, in such a case a blockage can be detected erroneously and a corresponding dredging procedure triggered. The proposed method prevents such "false positive" recognition.
Sewage pumps generally refer to fluid machines that utilize rotational motion and dynamic forces to deliver a fluid that is primarily liquid. Preferably, the sewage pump is designed as a rotary pump. In rotary pumps, centrifugal forces generated in radial flow are used for transport in addition to tangential acceleration of the fluid, and such pumps are also referred to as centrifugal pumps. Preferably, the sewage pump may be used in a hydraulic installation of a building or other application.
During normal operation of the sewage pump, the housing of the motor of the sewage pump may be arranged above a pump housing in which an impeller driven by the motor via a motor shaft is arranged to convey fluid, wherein the motor housing is fixedly connected to the pump housing and/or may be designed as one piece. Likewise, the sewage pump and the motor may each have their own shafts, wherein these shafts may be connected to each other by means of a coupling device. Preferably, the motor shaft extends from the motor housing into the pump housing on the drive side and/or is fixedly connected to the motor shaft on the drive side in terms of position. Correspondingly, the inlet is preferably arranged below or at the bottom of the pump housing.
The fluid preferably comprises water or other liquid medium, such as sewage. The liquid may comprise solids, such as any kind of dirt or refuse, in particular faeces, sediment, sludge, sand, or even smaller wood pieces, wood chips, textiles, rags or the like. Preferably, the motor housing and/or the pump housing are made of metal, in particular cast iron or stainless steel, and/or of plastic.
The expression "during the transport of waste water" especially refers to the normal operation of the sewage pump, i.e. when the sewage pump is transporting a fluid, the fluid may be doped with the above-mentioned contaminants. Correspondingly, the impeller is driven positively and/or negatively by operating the motor in the first rotational direction and/or in the second rotational direction, in particular for conveying waste water or clean water as described below.
The slope is understood in particular to be the first time derivative of the time curve representing the electrical waste water operating value of the rotating motor, for example the current consumed by the motor during the transport of waste water and/or the electrical power, rotational speed or torque consumed by the motor during the transport of waste water, in particular the rate of change of the time curve representing the electrical waste water operating value of the rotating motor. The first derivative is generally described as df/dt.
The slope is understood in particular as the time derivative of the slope of the time curve representing the electrical waste water operating value of the rotating motor over time or the second derivative of the time curve representing the electrical waste water operating value of the rotating motor, for example the current consumed by the motor during the transport of waste water and/or the electrical power or torque consumed by the motor during the transport of waste water.
Within the scope of the invention, a time curve is understood to mean, in particular, a time sequence, in particular a time sequence, of operating values (for example power, torque, rotational speed or current) of the motor. The time profile may be averaged (in particular quadratic averaged) and/or smoothed. The time profile may comprise a continuous and/or discrete sequence of running values. It is particularly preferred that the slope and/or curvature of the time curve comprises an approximate derivative of the discrete-time signal obtained by a first and/or second order difference quotient of the running values.
The plug threshold may be predefined or dynamically dependent on the wastewater type and/or the plug type, as described below. The occlusion threshold may include two values for slope and curvature. In principle, so-called dredging programs known from the prior art can be used for releasing the plugs, which generally comprise a time-limited and/or repeated, in particular repeated and/or alternating operation of the motor in the first direction and/or the second rotational direction (in particular in the forward direction and/or the reverse direction), in particular at regular intervals.
According to a preferred refinement, the method comprises the following steps:
classifying the plugs based on the slope and/or curvature of the time profile of the electrical wastewater run value; and
Plugs are released according to the classification of plugs.
In comparison with the prior art, the release of plugs can be achieved in a significantly more efficient manner according to this embodiment, since the release of plugs (in particular the dredging procedure initiated for this purpose) is selected as a function of the previously determined plug classification. Because the type of presence of the blockage can be identified based on the slope and/or curvature of the time curve of the running value of the electrical waste water, as demonstrated by the experiment. For example, in one case the slope and/or curvature of the current consumption of the motor is greater and in the other case the slope and/or curvature of the current consumption of the motor is smaller, which means that in one case there is a greater or harder dirt stuck in the impeller than in the other case. The position of the obstruction can also be determined based on the slope and/or curvature of the time curve of the electrical wastewater operating value. The corresponding dredging procedure may be selected for release, one for larger or harder soils and another for smaller and softer soils, or for the location of blockages. Such a dredging procedure is characterized by a lower/faster rotational speed, a lower/higher acceleration and/or a smaller/larger interval.
According to a further preferred development, the method comprises the following steps when the slope and/or curvature of the time profile of the electrical waste water operating value exceeds the blockage threshold value:
stopping the motor; in particular
Acquiring a slope and/or curvature of a time curve characterizing an electrical obstruction running value of the rotating motor during a motor stop; and also especially
Classifying the plugs based on a slope and/or curvature of a time curve of electrical plug run values during the stop; and
Plugs are released according to the classification of plugs.
Stopping the motor may be achieved by different measures known from the prior art, for example by switching off the power supplied to the motor or by shorting the motor. Preferably after identifying the obstruction, the motor is stopped. With the proposed improvement, i.e. the slope and/or curvature of the time curve of the electrical obstruction running value of the rotating motor is acquired during the stopping of the motor, the inertial movement characteristics of the motor from the previous running speed to the stationary state can be evaluated, wherein the slope and/or curvature of the inertial movement (e.g. motor speed as a function of time) is used for classification.
According to a further preferred development, the method comprises the following steps when the slope and/or curvature of the time profile of the running value of the electrical waste water exceeds the blockage threshold value:
acquiring at least a slope and/or a curvature of a time curve characterizing an electrical obstruction running value of the rotating motor during acceleration of the motor in the first rotational direction and/or the second rotational direction; in particular
Classifying the plugs based on a slope and/or curvature of a time curve of the electrical plug run value; and
Plugs are released according to the classification of plugs.
By means of such measures, the type of blockage can be detected in a particularly reliable manner, so that, depending on the detected motor blockage behavior, a suitable unblocking program is then selected for the release of the blockage and applied accordingly. The motor may be accelerated one or more times, such as intermittently. To this end, the acceleration may include a linear, polynomial, or exponential increase and/or decrease in motor speed and/or torque. Classifying plugs based on the slope and/or curvature of the time profile of the electrical plug operational values may more accurately classify plug types than by the slope and/or curvature of the time profile of the electrical wastewater operational values.
According to a further preferred development, the method comprises the following steps:
during the transport of fresh water, in particular a plurality of times, by means of a sewage pump by accelerating the motor in a first rotational direction and/or in a second rotational direction, in particular at least the slope and/or curvature of a time curve representing the running value of the fresh water of the rotating motor is detected, wherein
The occlusion threshold is defined by the slope and/or curvature of the time curve of the running value of the fresh water increased by a factor.
By means of the repeated delivery of fresh water in particular, a basic state of the sewage pump can be determined, which is characterized by the slope and/or curvature of the time profile of the running value of the fresh water, in which state the sewage pump is not clogged. In particular, by accelerating in both directions of rotation, the basic state of the pump can be reliably acquired, so that a knowledge database is created. As previously mentioned, the pump is preferably accelerated and in particular braked a plurality of times in a spaced or repeated manner. In this connection, clear water refers to waste water without dirt, such as tap water. The coefficient may depend on the type of wastewater and be, for example, 1.1, 1.2, 1.5, 2, 3, 5, or other values. The blockage threshold is preferably defined by the maximum value of the slope and/or curvature (in particular within a defined time) of the time curve of the running value of the fresh water.
According to a further preferred development, the slope and/or curvature of the time profile of the running value of the electric water characterizing the rotating motor is determined by means of a particularly predefined speed-time function, and the determination comprises measuring the slope and/or curvature of the time profile of the running value of the electric water characterizing the rotating motor over time. Such a function can be predefined in the control device of the pump, so that the basic state of the pump during the delivery of fresh water is detected. The function may comprise a plurality of different rotational speeds and/or accelerations, which run successively.
According to another preferred refinement, the method comprises the following steps:
comparing the slope and/or curvature of the time curve of the electric wastewater operational value and/or the slope and/or curvature of the time curve of the electric plug operational value with the slope and/or curvature of the time curve of the electric clear water operational value to classify the plug; and
Plugs are released according to the classification of plugs.
By means of the proposed measures, a knowledge database can be established, which is known about the behavior of the sewage pump in its basic state. This basic state can be compared with the transport waste water during normal operation of the sewage pump in order to be able to determine blockages. By comparing the slope and/or curvature of the time profile of the electric waste water run value and/or the slope and/or curvature of the time profile of the electric plug run value with the slope and/or curvature of the time profile of the electric clear water run value, the plug type can be classified significantly more accurately during acceleration than by the slope and/or curvature of the time profile of the electric waste water run value and/or than by the slope and/or curvature of the time profile of the electric plug run value.
According to a further preferred development, the acquisition of the slope and/or curvature of the time curve of the running value of the fresh water characterizing the rotating motor comprises the acquisition of at least the resistance curve at particularly different rotational speeds, accelerations and/or directions of rotation during the running of the fresh water. The acquisition of such a resistance curve or curves can be compared in the event of a blockage with the pump basic state recorded by the resistance curve, in order to be able to select, in particular, the type of blockage and the corresponding dredging program, preferably the dredging program for the type of blockage, as a function of the comparison result. The resistance curve is preferably plotted and stored in the memory of the control device before the sewage pump is operated. Furthermore, the resistance curve may be updated periodically (e.g. once per year) in order to be able to identify wear on the sewage pump due to the operation of the impeller, e.g. due to high friction in the bearings and seals of the sewage pump, and/or to take this into account when identifying a blockage.
According to another preferred refinement, the method comprises the following steps:
comparing the slope and/or curvature of the time profile of the electrical wastewater operational value and/or the slope and/or curvature of the time profile of the electrical plug operational value with the resistance profile to classify the plug; and
Plugs are released according to the classification of plugs.
Experiments have shown that this measure is particularly effective for releasing plugs, since by comparison with the resistance curve determined for clear water, a dredging procedure can be selected which matches the determined type or classification of plug. Thus, the plugs can be released significantly faster and more effectively than the measures known from the prior art.
According to yet another preferred refinement, releasing the plug comprises the steps of:
The selection and/or execution of the dredging program is based on the slope and/or curvature of the time profile of the electrical waste water operating value, in particular based on the classification of blockages, in particular a torque-controlled dredging program, a rotational speed-controlled dredging program, in particular with a torque threshold value, and/or a dynamic dredging program.
Furthermore, further dredging procedures are conceivable, i.e. these generally comprise varying the motor rotational speed, in particular by accelerating the motor in the first rotational direction and/or in the second rotational direction (in particular in the forward and/or reverse direction). For example, such a dredging procedure may monitor the torque, in particular by a control device controlling the motor, in order to avoid damage to the sewage pump. It is contemplated that if the torque threshold is exceeded (e.g., the impeller is stuck or is not rotated or is only slightly rotated due to large dirt despite the use of a pull-up procedure), the pull-up procedure may shut down the motor.
According to a further preferred development, the method comprises the following steps:
During execution of the dredging program or during the additional transport of the waste water by running the motor in the first rotational direction, at least the slope and/or curvature of a time curve characterizing the additional electrical plug running value of the rotating motor is acquired; and
During acceleration of the motor in the first rotational direction and/or in the second rotational direction, it is checked whether the slope and/or curvature of the time profile of the further electrical plug operating value is below a particularly predefined plug threshold value, in order to recognize whether the plug is released or to release the plug again in such a way that the motor is operated at least in the second rotational direction.
After or during the step of releasing the plugs, it is convenient to check whether the plugs are released, especially by a dredging procedure. If the plugs are released, the sewage pump can be used again normally to deliver waste water. If, however, the blockage is not released, in particular because the slope and/or curvature of the time profile of the further electrical blockage operating value is still greater than a particularly predetermined blockage threshold during acceleration of the motor in the first rotational direction and/or in the second rotational direction, the preceding steps can be applied again to release the blockage (in particular partially) or the sewage pump can be switched off. In the latter case, the maintenance technician or the control center may be notified that the work of automatically releasing the plugs is unsuccessful, and thus may release the plugs, particularly manually, by disassembling the pump and/or impeller, etc. Since it is possible to check whether the plug is released during the execution of the dredging process, this means that the normal operation is resumed much faster than in the prior art method.
According to yet another preferred refinement, the release of the obstruction comprises operating the motor in the second rotational direction and after a certain period of time from the start of the transport in the opposite rotational direction comprises operating the motor in the first rotational direction. The rotational speeds of the different rotational directions may be the same or different. For example, the rotational speed in the second rotational direction may be greater than the rotational speed in the first rotational direction. The change of direction of rotation can be performed after 1,2 or 5 minutes, wherein other times are also conceivable. It is also conceivable that several of the sequences in this sequence will run at higher rotational speeds. Instead of or in addition to this rotational speed, the acceleration can also be changed or increased.
According to a further preferred development, the slope and/or curvature of the time profile of the electric waste water operating value, also of the electric clear water operating value, and/or of the electric plug operating value, comprises the physical variables of the power ratio of the rotating motor, i.e. the current, torque and/or power consumed by the rotating motor. The electric waste water operation value, the electric clear water operation value and/or the electric plug operation value, and/or the slope and/or curvature of the electric waste water operation value, the electric clear water operation value and/or the electric plug operation value time curve can also comprise smoothing of the values, averaging of the values and/or filtering of the values. The term "value" is also understood as a series of values, in particular values within a time interval.
The object of the invention is also achieved by a sewage pump having: a pump housing, which has in particular an inlet (preferably a suction opening), a shaft arranged in the pump housing, an impeller located at the shaft and in particular facing the inlet; motor for driving shaft and control device, wherein
The control device is configured for acquiring at least a slope and/or a curvature of a time curve characterizing an electric wastewater operation value of the rotating motor during the transportation of wastewater by the wastewater pump by operating the motor in the first rotational direction; and
The control device is configured to operate the motor at least in a second rotational direction opposite to the first rotational direction for releasing the blockage if the slope and/or curvature of the time profile of the electrical waste water operating value exceeds a particularly predefined blockage threshold value.
The control device preferably has a microprocessor or the like, by means of which it is possible to determine a first and/or second time derivative, to check whether the slope and/or curvature of the time profile of the running value of the electric waste water exceeds a particularly predefined blockage threshold value, and/or to operate the motor in order to release a blockage. For detecting the slope and/or curvature of the time profile of the running electrical waste water value, a sensor, for example a current sensor, can be provided, which is connected to the motor and/or monitors the motor.
Other designs and advantages of the sewage pump will occur to those skilled in the art in a similar manner to the method described above.
Drawings
Hereinafter, the present invention will be described in more detail by means of preferred embodiments with reference to the accompanying drawings.
In the drawings:
Figure 1 shows a schematic view of a sewage pump for implementing the proposed method according to a preferred embodiment of the present invention,
Figure 2 shows a flow chart for implementing the proposed method according to a preferred embodiment of the invention,
FIG. 3 shows a part of a power/time diagram when implementing the proposed method according to a preferred embodiment of the invention, and
Fig. 4 shows a power/rotational speed diagram when implementing the proposed method according to a preferred embodiment of the invention.
Detailed Description
Fig. 1 shows a schematic view of a sewage pump 1 for carrying out the method according to a preferred embodiment of the invention described below for releasing a blockage of a sewage pump 1.
The sewage pump 1 has a conventional pump housing 2 with a suction opening 3 as an inlet, which is arranged at the bottom of the pump housing 2 in the drawing. In the pump housing 2, a shaft 4 is provided, which extends vertically in the drawing. The shaft 4 is driven by a motor 5 (only shown approximately) which is arranged in the opposite direction to the suction opening 3. An impeller 6 is arranged towards the suction opening 3, which impeller is driven by means of a motor 5 via a shaft 4. Furthermore, the sewage pump 1 has a microprocessor-based control device 7, which is only schematically shown in fig. 1.
Fig. 2 shows a flow chart for implementing the proposed method according to a preferred embodiment of the invention. In an optional preparation step for carrying out the described method for releasing a blockage of the sewage pump 1, the sewage pump 1 is first operated with clean water. Specifically, the motor 5 is operated a plurality of times during the transportation of the fresh water in the forward direction and/or the reverse direction (i.e., in the first rotational direction and/or in the second rotational direction opposite to the first rotational direction) and is accelerated in the forward direction and/or the reverse direction. During operation of the motor 5, a plurality of discrete values of the running water of the rotating motor, which are characteristic of the rotation over time, are detected by means of a schematically represented sensor 8 by means of a speed-time function predefined by the control device 7. The sensor 8 is designed as a current sensor and a voltage sensor, and thus obtains the power consumed by the sewage pump 1 in addition to the current. In addition, other physical variables of the power ratio of the rotating motor 5 can also be detected as running values of the electric water, for example torque.
The slope and/or curvature of the time curve of the thus obtained running value of the electric fresh water, i.e. the first and second time derivatives of the thus obtained running value of the electric fresh water, is then determined by means of the control device 7. Since the motor 5 is operated at different rotational speeds, accelerations and rotational directions, the characteristic resistance curve of the sewage pump 1 when operating with fresh water can be determined in this way and stored in the memory of the control device 7. These resistance curves represent the operational characteristics of the sewage pump 1 when operating with clean water that is not loaded with sewage.
When wastewater (i.e. water containing different kinds of sewage) is transported using the sewage pump 1, the sewage pump 1 generally requires more electric energy than when transporting clean water. Correspondingly, the slope and/or curvature 100 of the time curve of the electrical waste water operating value, which is characteristic of the rotating motor, obtained during the transport of waste water is higher than the corresponding slope and/or curvature of the time curve of the current running electrical waste water operating value. The running value of the electric waste water can then be detected by means of the sensor 8.
If the sewage pump 1 is now clogged, for example if the dirt reduces the rotational speed or torque of the impeller 6 or if the impeller 6 is even jammed and stopped, the electric waste water operating value, i.e. the slope and/or curvature of the time profile of the electric waste water operating value, changes. If the slope and/or curvature of the time profile of the electric waste water operating value exceeds a predefined blockage threshold value, the control device 7 recognizes that the sewage pump 1 is blocked. The blockage threshold is conveniently formed by a maximum value of the slope and/or curvature of the time curve of the running value of the electric water being increased by a factor, for example 1.3 times the slope and/or curvature of the time curve of the running value of the electric water. For example, if the sewage pump 1 consumes 1000W when delivering clean water, the conventional output power when delivering wastewater is 10000W. However, once the sewage pump 1 consumes 30000W, the control unit determines that a blockage has occurred, first stops the motor 5 200, and then releases the blockage by operating the motor 5 in the forward and/or reverse direction.
Fig. 3 shows a part of a power/time diagram when implementing the proposed method according to a preferred embodiment of the invention, while fig. 4 shows a power/rotational speed diagram when implementing the proposed method according to a preferred embodiment of the invention. Fig. 3 illustrates how efficiency is obtained from the power-time function and/or the power-speed function as an electric wastewater operation value. The control means 7 can then recognize, based on the slope, that a blockage of the sewage pump 1 has occurred when the blockage threshold is exceeded. Fig. 4 shows different power/rotational speed curves. The flatter solid power/rotation speed curve represents the acceleration performance of the sewage pump 1 without clogging when the clean water is conveyed, and the lower limit value and the upper limit value of the clogging threshold value are respectively represented by dashed lines. The steeper solid power/speed curve represents the operating characteristics of the sewage pump 1 in the event of a blockage.
The release of the plugs includes first accelerating the motor 5 in the forward and reverse directions from a stationary state in order to classify the plugs and then releasing the plugs according to the classification of the plugs. For this purpose, the sensor 8 acquires the slope and/or curvature 300 of a time curve representing the electrical obstruction running value of the motor. The slope and/or curvature of the time profile of the thus acquired electrical obstruction run value is compared to the previously acquired resistance profile to identify the type or classification 400 of obstruction.
Based on the comparison, a selection 500 is then carried out by the control device 7 and a unblocking program adapted to the type of blockage is then applied, in particular based on the classification of the blockage. Such a dredging procedure may be a torque-controlled, rotational speed controlled (in particular with a torque threshold) dredging procedure, may be a dynamic dredging procedure or a mixture of the above-mentioned dredging procedures. Furthermore, a dredging procedure known from the prior art can be envisaged, however such a dredging procedure is selected according to the type of obstruction.
In principle, such a dredging procedure involves running the motor 5 in the opposite rotational direction with respect to the conveying waste water and, after a certain period of time from the start of the conveying in the opposite rotational direction (for example after 1,2 or 5 minutes), running the motor 5 in the rotational direction for conveying waste water. The dredging procedure may comprise a plurality of such intervals, which are separated from each other, for example by pauses. These intervals may also contain increasing rotational speed or acceleration of the motor 5.
After the execution of the dredging procedure it is checked in a further step whether the plug is in fact released. For this purpose, the slope and/or curvature 600 of the time curve characterizing the further electrical obstruction operating value of the rotating motor is acquired by the sensor 8 by operating the motor in the forward and reverse direction during the further transport of the waste water, in particular by accelerating from a standstill state.
The control means 7 then check if the obstruction is released 700. If the slope and/or curvature of the time profile of the further electrical plug operating value during acceleration of the motor 5 in the first rotational direction and/or in the second rotational direction is below a predefined plug threshold value, it follows that the plug has been released. Otherwise the control means 7 perform the previously described steps again, thus effecting the release of the obstruction. For example, the control device 7 can likewise switch off the sewage pump 1 when the slope and/or curvature of the time profile of the further electrical plug operating value is, from now on, higher than the previously determined slope and/or curvature of the time profile of the electrical plug operating value or the electrical waste water operating value.
The described embodiments are examples only, which can be modified and/or supplemented in a number of ways within the scope of the claims. Each feature used to describe a certain embodiment can be used in any other embodiment either alone or in combination with other features. Each feature of the embodiments for illustrating a certain class can also be applied in a corresponding manner in another class of embodiments.
List of reference numerals
The sewage pump 1,
The pump housing 2 is provided with a pump housing,
The suction opening 3 is provided with a suction opening,
The shaft (4) is provided with a pair of grooves,
The motor (5) is provided with a motor,
The impeller (6) is provided with a plurality of blades,
The control means 7 are arranged to control the control means,
The sensor(s) 8 are (are) arranged,
At least one of a first time derivative and/or a first time derivative of an electrical waste water operating value characterizing a rotary motor
The second time derivative 100 is taken to be,
The motor is stopped 200 and the motor is stopped,
Obtaining at least a first-order time guide characterizing an electric obstruction running value of a rotary motor
The digital and/or second time derivative 300,
Plugs are classified based on the electrical plug run value 400,
The dredging process 500 is selected according to the running value of the electric wastewater,
At least a first order time is taken to characterize the rotational motor's additional electric obstruction operating value
The derivative and/or the second time derivative 600,
It is checked whether the further electrical plug operating value is below a predefined plug threshold 700.
Claims (18)
1. Method for identifying and/or classifying a blockage for releasing a sewage pump (1), the sewage pump having: -a pump housing (2) having a shaft (4) arranged in the pump housing (2), -an impeller (6) located at the shaft (4); and a motor (5) driving the shaft (4), the method having the steps of:
-acquiring a slope and/or curvature (100) of a time curve characterizing an electric wastewater operation value of the rotating motor (5) during the transportation of wastewater by means of the wastewater pump (1) by operating the motor (5) in a first rotational direction; and
When the slope and/or curvature of the time curve of the electric waste water operation value exceeds a blockage threshold value, a blockage is released by operating the motor (5) at least in a second rotational direction opposite to the first rotational direction.
2. The method according to claim 1, having the steps of:
Classifying the plugs based on a slope and/or curvature of a time curve of the electrical wastewater run value; and
The plugs are released according to the classification of the plugs.
3. The method according to claim 1, wherein when the slope and/or curvature of the time curve of the electrical wastewater operational value exceeds the blockage threshold, the method has the steps of:
Stopping (200) the motor (5); and
Acquiring a slope and/or a curvature of a time curve characterizing an electrical obstruction running value of the rotating motor (5) during a stop of the motor (5); and
Classifying the plugs based on a slope and/or curvature of a time curve of the electrical plug run values during the stop; and
The plugs are released according to the classification of the plugs.
4. The method according to claim 2, wherein when the slope and/or curvature of the time curve of the electrical wastewater operational value exceeds the blockage threshold, the method has the steps of:
-acquiring a slope and/or curvature (300) of a time curve characterizing an electrical obstruction running value of the rotating motor (5) during acceleration of the motor (5) in the first and/or second rotational direction; and
Classifying (400) the plugs based on a slope and/or curvature of a time curve of the electrical plug run value; and
The plugs are released according to the classification of the plugs.
5. The method of claim 4, having the steps of:
During the multiple delivery of fresh water by means of the sewage pump (1) by accelerating the motor (5) in the first and/or second direction of rotation, at least the slope and/or curvature of a time curve representing the running value of the electric fresh water of the rotating motor (5) is acquired, wherein
The occlusion threshold is defined by the slope and/or curvature of the time curve of the running value of the electro-water increased by a factor.
6. Method according to claim 5, wherein at least the slope and/or curvature of the time curve characterizing the running value of the electric water of the rotating motor (5) is obtained by means of a speed-time function, and the obtaining comprises the slope and/or curvature of the time curve characterizing the running value of the electric water of the rotating motor (5) from a time measurement.
7. The method according to claim 5 or 6, having the steps of:
Comparing the slope and/or curvature of the time curve of the electric wastewater operational value and/or the slope and/or curvature of the time curve of the electric plug operational value according to the preceding claim 4 with the slope and/or curvature of the time curve of the electric clear water operational value to classify the plug; and
The plugs are released according to the classification of the plugs.
8. The method of claim 5, wherein
The at least acquisition of the slope and/or curvature of the time curve of the running value of the electric water of the motor (5) characterizing the rotation comprises the acquisition of at least a resistance curve with different rotational speeds, accelerations and/or directions of rotation during running of the water.
9. The method of claim 8, having the steps of:
Comparing the slope and/or curvature of the time profile of the electrical wastewater operational value and/or the slope and/or curvature of the time profile of the electrical plug operational value according to claim 4 with the resistance profile to classify the plug; and
The plugs are released according to the classification of the plugs.
10. The method of claim 9, wherein the release of the obstruction comprises the steps of:
A dredging procedure (500) is selected and/or performed in dependence on the slope and/or curvature of the time profile of the electrical wastewater operational value.
11. Method according to claim 10, wherein the selection and/or execution of the unblocking procedure is performed according to the classification of the blockage according to claim 2, 4, 5 or 9.
12. The method of claim 10, wherein the pull-through procedure is a torque-controlled pull-through procedure, a rotational speed controlled pull-through procedure, and/or a dynamic pull-through procedure.
13. The method of claim 12, wherein the speed controlled pull through procedure has a torque threshold.
14. The method according to claim 10, having the steps of:
-acquiring at least the slope and/or curvature (600) of a time curve characterizing the further electrical blockage operating value of the rotating motor (5) during the execution of the dredging procedure according to claim 10 or during the further transport of waste water by operating the motor (5) in the first rotational direction; and
During acceleration of the motor (5) in the first and/or second rotational direction, checking whether the slope and/or curvature of the time curve of the further electrical obstruction running value is below the obstruction threshold (700) to identify whether the obstruction is released or to release the obstruction again in such a way that it is run by the motor (5) at least in the second rotational direction.
15. The method according to any one of claims 1 to 6, wherein the releasing of the obstruction comprises operating the motor (5) in the second rotational direction and, after a certain period of time from starting the transport in the second rotational direction, comprises operating the motor (5) in the first rotational direction.
16. The method according to claim 5, wherein the slope and/or curvature of the time curve of the electric waste water operation value, also the electric clear water operation value according to claim 5, and/or also the electric plug operation value according to claim 4, comprises a power ratio physical variable of the rotating motor (5).
17. The method according to claim 16, wherein the power ratio physical variable of the motor (5) is the current, torque, rotational speed and/or power consumed by the rotating motor (5).
18. A sewage pump (1), the sewage pump having: -a pump housing (2) having a shaft (4) arranged in the pump housing (2), -an impeller (6) located at the shaft (4); a motor (5) driving the shaft (4) and a control device (7), wherein
The control device (7) is configured for acquiring at least a slope and/or a curvature of a time curve characterizing an electric wastewater operation value of the rotating motor (5) during the transportation of wastewater by the wastewater pump (1) by operating the motor (5) in a first rotational direction; and
The control device (7) is configured for operating the motor (5) at least in a second rotational direction opposite to the first rotational direction for releasing the obstruction when the slope and/or curvature of the time profile of the electric waste water operating value exceeds a obstruction threshold.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| BE202206046 | 2022-12-20 | ||
| BE2022/6046 | 2022-12-20 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN118224103A true CN118224103A (en) | 2024-06-21 |
Family
ID=86095995
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311705487.9A Pending CN118224103A (en) | 2022-12-20 | 2023-12-13 | Method for identifying and/or classifying blockages of a discharge pump |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP4390141A1 (en) |
| CN (1) | CN118224103A (en) |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US7080508B2 (en) * | 2004-05-13 | 2006-07-25 | Itt Manufacturing Enterprises, Inc. | Torque controlled pump protection with mechanical loss compensation |
| GB2447867B (en) * | 2007-03-29 | 2010-01-27 | Byzak Ltd | Sewage pump blockage detection |
| GB201108171D0 (en) * | 2011-05-17 | 2011-06-29 | Ids Maintenance Ltd | Deragging pump controller |
| CN113357166B (en) * | 2021-06-23 | 2022-12-30 | 中海油能源发展股份有限公司 | Real-time early warning method for pump sticking of electric submersible pump based on production data and high-frequency data |
-
2023
- 2023-11-30 EP EP23213302.5A patent/EP4390141A1/en active Pending
- 2023-12-13 CN CN202311705487.9A patent/CN118224103A/en active Pending
Also Published As
| Publication number | Publication date |
|---|---|
| EP4390141A1 (en) | 2024-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JP5017665B2 (en) | Pump control system | |
| CN110332102B (en) | Control method and device of automatic emptying water pump, corresponding equipment and storage medium | |
| EP2025943A2 (en) | Pump system | |
| JP6404367B2 (en) | Method for controlling a pumping device | |
| KR20080096551A (en) | Air conditioner | |
| CN104011396B (en) | Controlled including the cleaning process according to motor load or the pump of stopping | |
| AU2017213444A1 (en) | Centrifugal pump | |
| CN118224103A (en) | Method for identifying and/or classifying blockages of a discharge pump | |
| KR102353707B1 (en) | How to check snoring | |
| CN111989494B (en) | Drain pump assembly and method for controlling drain pump | |
| DE102016216737B4 (en) | Laundry care device with a controller | |
| JP2016099022A (en) | Indoor unit for air conditioner | |
| CN115523137A (en) | Oil pump device | |
| JP2008253900A (en) | Operation device of disposer | |
| CN218861690U (en) | Garbage processor | |
| EP4160023B1 (en) | Method for performing priming of a submersible pump | |
| KR100583901B1 (en) | Turbo driving method and device of paper shredder | |
| KR102319911B1 (en) | Foreign object removal apparatus for electric oil pump and method thereof | |
| EP4390137A1 (en) | Method for releasing a blockage of a waste water pump | |
| CN116601389A (en) | Method for operating a conveyor device with an eccentric screw pump for conveying viscous building materials | |
| CN205153032U (en) | Water supply | |
| CN113614381A (en) | Method for detecting the occurrence of suction during the operation of a machine for delivering liquids | |
| JP2006305460A (en) | Garbage disposer | |
| JPH0491392A (en) | Blockage-preventing control device for shredding pump | |
| CN102869833A (en) | Arrangement for degassing control |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination |