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
  • F04D15/0066—Control, e.g. regulation, of pumps, pumping installations or systems by changing the speed, e.g. of the driving engine
• • 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
  • F04D15/0088—Testing machines
• • 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
  • F04D29/66—Combating cavitation, whirls, noise, vibration or the like; Balancing
  • F04D29/669—Combating cavitation, whirls, noise, vibration or the like; Balancing especially adapted for liquid pumps
• • 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

Definitions

• the present invention relates to a method for operating a circulating pump, in particular a heating circulation pump, which is characterized by a variable-speed pump drive.
• operating noise of the pump can be transmitted through the piping system into the living space, which residents usually feel annoying. For this reason, the lowest possible noise emission of the pump during operation is desirable.
• the noise emission of the pump is variable and depends on the current operating point of the pump.
• the operating point represents the point of intersection between the control characteristic and the system characteristic.
• the pump delivers a certain flow with a certain delivery head.
• the pump operating point can be varied by adjusting the engine speed.
• the resulting noise emission does not necessarily increase as the speed increases, since natural oscillations of the pump in conjunction with vibrations in the line system contribute to the development of noise. For this reason, it may happen that the pump operates comparatively quietly at certain operating points, while other operating points, possibly also at low speed, can lead to disturbing noise emissions.
• the search is therefore for a solution that reduces the resulting noise of the pump at least when needed, so that disturbing noise in the living space are suppressed as much as possible.
• a method for operating a circulation pump in which the pump controller modifies the currently set operating point of the pump control in order to reduce the noise emission of the pump.
• the circulating pump is typically a centrifugal pump.
• the pump control first determines the necessary control variable for the engine speed as a function of the required nominal head. Subsequently, the initially defined operating point is checked by the pump controller for the resulting noise emission of the pump and, if necessary, an adjustment of the operating point is carried out in order to reduce the noise emission of the pump. As a result, there is a slight shift in the pump operating point.
• the pump controller modifies the rotational speed for the specific operating point of the pump in order to reduce the noise emission.
• the rotational speed is increased. This is particularly preferably increased until the desired noise emission occurs or a sufficient reduction of the operating volume results.
• An increase in the rotational speed is expedient, as this continues to ensure a sufficient nominal delivery height.
• the higher energy consumption due to the speed increase is accepted with regard to a reduced noise emission.
• the pump control has access to at least one acoustic reference characteristic map which comprises an assignment of the noise emission of the pump to a multiplicity of different operating points. Consequently, the pump control can take the theoretical noise emission for the respective operating point from the characteristic map.
• the acoustic reference field should preferably be stored within a local memory of the pump control. Also conceivable is the access to an external memory by means of a suitable communication interface.
• the pump controller can estimate the resulting noise emission of the pump and - if this is classified as too high, for example. Above a definable limit - improve the noise emission by increasing the speed. Particularly preferably, the rotational speed of the pump is raised until an operating point of the acoustic reference characteristic field is achieved with less or sufficiently low noise emission.
• the acoustic reference map contains exclusively or predominantly operating points with unfavorable noise emission.
• the pump control will only modify the speed if the originally set operating point coincides with an operating point included in the reference map.
• the required acoustic reference characteristic field is determined, for example, by the manufacturer of the pump by means of a reference pump and stored in a local memory of the pump control before delivery of the pumps. Since in practice often too Manufacturing tolerances and thus may lead to deviations of the performance between individual pumps of the same series, reflects the acoustic reference map used, the actual acoustic behavior of the pump under certain circumstances, only inadequate. The present installation conditions at the place of use of the pump can also influence the accuracy of the reference characteristic field.
• the pump control has access to a so-called comparison reference map, which for a plurality of operating points of the pump from the operating point represents dependent and measurable pump operating variable.
• This pump operating variable can be exactly measured during the pump operation. Deviations of the measured pump operating variable to the pump operating variable contained in the comparison reference characteristic map at the respective operating point serve as an indicator for a possible deviation or displacement of the acoustic reference characteristic field from the real acoustic behavior of the pump.
• a suitable operating variable is the measurement of the acceleration of the conveyed medium and / or the driven pump impeller and / or the pump housing.
• the acceleration can be derived by means of a suitable sensor of the pump metrologically either directly or indirectly on the basis of other measures. If the acceleration of the pump housing is measured, it should be recorded as close as possible to the pump impeller.
• the height of the difference value between measured acceleration and reference acceleration is an indication of a shift of the acoustic reference characteristic from the real acoustic characteristic of the pump in the current pump operation.
• the degree of displacement is taken into account by the pump control during the modification of the operating point, ie the increase in the pump speed.
• optimization of the noise emission is achieved by the method execution, but due to the speed increase at the expense of a higher energy consumption.
• the process execution can be manually activated or deactivated by means of an input element by the consumer. It is also conceivable to couple the process execution to certain external circumstances, for example, to the time of day or to another automatic system control of a heating system.
• the present object is also achieved by a circulation pump, in particular a heating circulation pump, with a corresponding pump control for carrying out the method according to the present invention. Accordingly, the same advantages and properties as described above with respect to the method according to the invention result for the circulating pump. A repetitive description is omitted for this reason.
• the circulating pump is typically a centrifugal pump.
• the circulation pump according to the invention preferably comprises a suitable sensor for detecting the pump operating variable of the comparison reference characteristic map, in particular an acceleration sensor which is mounted at a suitable position on the pump housing and detects the experienced acceleration of the pumped medium and / or the impeller during pump operation. If the acceleration of the pump housing is measured, it should be detected as close as possible to the pump impeller, i. the sensor should be located in close proximity to the impeller on the pump housing.
• FIG. 1 shows: an exemplary acoustic reference characteristic of the circulation pump according to the invention with different operating points and Figure 2: a sketch to illustrate the principle of creep operation of the circulation pump according to the invention.
• the present invention proposes the implementation of a creep operation for a heating circulation pump. This function can be activated by the end user via an accessible rotary knob of the pump if required.
• the acoustic emission at different operating points is recorded on a suitable test bench during the development phase of the circulation pump. It makes sense to use a reference pump for generating the reference maps. Many operating points are approached on the test bench and the operating volume of the reference pump is recorded in the respective operating points.
• the association between operating points and loudness values is stored as a matrix and referred to below as the acoustic reference characteristic field.
• FIG. 1 shows an exemplary example of the generated acoustic reference map.
• Each operating point of the pump is defined by the flow Q and the associated head H of the pump.
• the exemplary measured operating points are indicated in the diagram representation by the drawn-in circular points.
• the noise emission of the pump recorded in these operating points is indicated by different gray coloration of the dots according to the gray scale scale indicated on the right in the illustration.
• the pump Using the recorded acoustic behavior of the pump particularly unfavorable operating points are detected and stored in the pump control. If creep mode is activated during pump operation, the pump will not start the stored critical operating points. This is done by increasing the speed until an acoustically more favorable operating point is reached.
• the effects of the method according to the invention will be explained below with reference to two exemplary operating points of FIG. If, for example, the pump is located at the operating point BP1a, which is an acoustically unfavorable operating point, as shown by the gray level of the operating point, the speed of the pump is increased until the operating point BP1b has been reached, which is opposite to the operating point BP1a lower noise emission of the pump distinguishes. Although this slightly increases the energy consumption of the circulation pump, this is accepted in view of the reduced noise emission. Similarly, the inventive modification of the operating point BP2a can be considered in the direction of the new operating point BP2b.
• the commercial pump can then compare the data of its acceleration sensor with the reference acceleration map. From the shift between measured acceleration and the acceleration of the reference acceleration map, it is also possible to conclude a shift between the acoustic reference characteristic map and the real (not measurable) acoustic characteristic diagram.
• FIG. 2 shows an example of this procedure.
• the reference numeral 10 indicates the reference pump.
• an acoustic reference map 11 is recorded by test drives.
• a reference map acceleration 12 is determined, wherein subsequently possible correlations between the two different reference maps 1 1, 12 are determined. This information is then held in the local memory of the commercial pumps 20, so that the respective pump control of the commercial pumps 20 can use it to carry out the process.
• the real acceleration map 13 is determined and compared with its reference map 12.
• the findings that can be obtained therefrom are also used to determine deviations of the acoustic reference characteristic map 1 1 from the characteristic map 14 of the pump 20 actually present in practice.
• the output noise emission of the pump can be determined with sufficient accuracy for the respective commercial pump 20 in pump operation, and an adaptation of the control accordingly takes place.
• the creep operation i. the process execution is disabled by default, but can be enabled by appropriate user input when needed.

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

Priority Applications (3)

Applications Claiming Priority (2)

Publications (1)

Family

ID=61628302

Family Applications (1)

Country Status (5)

Cited By (1)

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Citations (4)

Family Cites Families (6)

• 2017
  • 2017-03-10 DE DE102017203960.4A patent/DE102017203960A1/de not_active Withdrawn
• 2018
  • 2018-02-28 CN CN201880016820.6A patent/CN110382872B/zh active Active
  • 2018-02-28 RU RU2019131527A patent/RU2766499C2/ru active
  • 2018-02-28 WO PCT/EP2018/054888 patent/WO2018162291A1/de active Application Filing
  • 2018-02-28 EP EP18711027.5A patent/EP3592980B1/de active Active

Patent Citations (4)

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