EP2626567B1 - Pump casing - Google Patents

Pump casing Download PDF

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Publication number
EP2626567B1
EP2626567B1 EP12154493.6A EP12154493A EP2626567B1 EP 2626567 B1 EP2626567 B1 EP 2626567B1 EP 12154493 A EP12154493 A EP 12154493A EP 2626567 B1 EP2626567 B1 EP 2626567B1
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EP
European Patent Office
Prior art keywords
pump housing
sensor
channel
bore
housing according
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.)
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Application number
EP12154493.6A
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German (de)
French (fr)
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EP2626567A1 (en
EP2626567B2 (en
Inventor
Casper Pedersen
Nicholas Pedersen
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Grundfos Holdings AS
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Grundfos Holdings AS
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Application filed by Grundfos Holdings AS filed Critical Grundfos Holdings AS
Priority to EP12154493.6A priority Critical patent/EP2626567B2/en
Priority to PCT/EP2013/050861 priority patent/WO2013117402A1/en
Priority to CN201380008576.6A priority patent/CN104114873B/en
Priority to US14/377,282 priority patent/US9863436B2/en
Publication of EP2626567A1 publication Critical patent/EP2626567A1/en
Publication of EP2626567B1 publication Critical patent/EP2626567B1/en
Application granted granted Critical
Publication of EP2626567B2 publication Critical patent/EP2626567B2/en
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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
    • F04D29/00—Details, component parts, or accessories
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps
    • F04D29/428—Discharge tongues
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D1/00—Radial-flow pumps, e.g. centrifugal pumps; Helico-centrifugal 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
    • 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
    • F04D29/40—Casings; Connections of working fluid
    • F04D29/42—Casings; Connections of working fluid for radial or helico-centrifugal pumps
    • F04D29/426—Casings; Connections of working fluid for radial or helico-centrifugal pumps especially adapted for liquid pumps

Definitions

  • the invention relates to a pump housing or a Nbianlaufnikelpumpe with a pump housing with the features specified in the preamble of claim 1.
  • Pump housing of the spiral housing type in question here are widely used in the art.
  • Such pump housings are used for example for heating circulation pumps, which are nowadays often equipped with electronic speed controllers, which open a wide range of applications.
  • a differential pressure measurement is regularly required for integration into a control system, which measures at least the pressure difference between the suction side and the pressure side of the pump.
  • a differential pressure transducer mounts such a differential pressure transducer on the pump housing itself.
  • a disadvantage of this known arrangement is that the channels are molded in the pump housing, which is typically made of cast iron must be, which is technically complex and requires in particular the use of lost cores, which means considerable costs, especially in mass production.
  • the present invention seeks to provide a generic pump housing with a receptacle for a differential pressure sensor so that this manufacturing technology is cheaper to manufacture.
  • the pressure measurement should be done on the pressure side as far as possible at a point in the one hand, the pressure of the actual output side of the pump prevailing line pressure largely corresponds, but on the other hand allows the most unambiguous quantity assignment in the QH diagram.
  • the pump housing according to the invention is a housing of the spiral housing type and has a suction channel, which opens into a space which is arranged to dispose a rotatable about a rotational axis impeller and which has a spirally encircling and open to this space channel, namely surrounding the impeller Spiral channel, which opens into a pressure channel.
  • the pump housing has a receptacle for a differential pressure sensor and is provided with a first sensor channel which connects the receptacle with the suction-side interior of the pump housing, and with a second sensor channel which connects the receptacle with the pressure-side interior of the pump housing.
  • the receptacle for the differential pressure sensor is arranged in the region between the spirally encircling channel and the suction channel.
  • Such an arrangement is particularly advantageous since both in casting technology Forming as well as machined channels can be formed rectilinear channels, which are relatively easy to manufacture manufacturing technology.
  • the arrangement according to the invention allows a pressure-side pressure measurement in a region which is particularly advantageous, as will be explained in more detail below.
  • the basic idea of the solution according to the invention is to provide a receptacle for a differential pressure sensor in the pump housing, which is arranged such that it can be guided with rectilinear channels into the interior of the pump housing, namely to the suction side on the one hand and to the pressure side on the other hand.
  • the receptacle may be located either within the pump housing or outside the pump housing, be it only as a mounting base or even with outside of the pump housing opening channels.
  • the receptacle according to the invention is particularly advantageously located inside the pump housing, as will be explained in more detail below.
  • the sensor channels are formed by bores in the housing.
  • Such holes can be made inexpensively, especially since such typically consisting of cast pump housing must be reworked usually span anyway.
  • the receptacle is formed by a bore in the housing.
  • the second sensor channel can advantageously lead through a transverse to the bore forming the receptacle, whereas the first sensor channel according to an advantageous embodiment of the invention in continuation of the recording forming hole is arranged, preferably in alignment with it, so is formed with the receptacle as a stepped bore.
  • the first sensor channel so the sensor channel which connects the suction side within the pump housing with the receptacle, is arranged substantially perpendicular to the axis of rotation of the impeller.
  • the second sensor channel which connects the receptacle with the pressure side within the pump housing, arranged substantially parallel to the axis of rotation of the impeller.
  • the second sensor channel opens in the pressure-side peripheral region of the centrifugal wheel, specifically there near the end of the spirally encircling channel which opens into the pressure channel. It has surprisingly been found that especially in this area the pressure-side pressure detection is particularly advantageous, since on the one hand a clear assignment to the flow rate is usually possible and on the other hand, the pressure measured there comes very close to the pressure actually prevailing at the outlet of the pump static pressure.
  • the second sensor channel forming bore is made through a preferably central housing opening, with which the pump housing connects to a motor housing and through which the impeller is inserted into the pump housing.
  • This already existing opening which is usually also machined, allows a parallel to the axis of rotation of the impeller arranged bore, which transverse to the recording forming Hole can open. It can thus be created a hole in which no end must be closed, as would have to be done, for example, if this hole would be introduced from the outside through the housing.
  • the bore forming the second sensor channel is guided by a wall covering the rotor wheel towards the housing opening. It is in this case opening to the above, through which the impeller is inserted into the pump housing.
  • the bore forming the second sensor channel can advantageously also be drilled from the outside into the pump housing.
  • the receptacle is formed by a bore in the pump housing, it is advantageous if at the outer end of this bore a transverse plane extending transversely to the bore axis is provided, which can serve as a contact surface for a sensor housing. Parallel to the bore axis, a threaded bore can be provided in this plane surface, in order to fasten a sensor housing to the plane surface with a screw.
  • the fastening could be provided via a second threaded bore, so that a sensor housing can be fastened on both sides of the bore on the plane surface.
  • the other end by means of a screw in the threaded bore can be fastened.
  • a second threaded hole can be saved by the headband, on the one hand supported in the groove and on the other hand held by the screw positive and non-positively on the flat surface is, the integrated underneath sensor housing is securely held positively and positively.
  • the differential pressure sensor itself is advantageously used by incorporating a sealing hat into the bore forming the receptacle so that it does not come into direct contact with the liquid via the sensor bores, but only indirectly. At the same time, the sealing hat ensures that no liquid can get into the bore forming the receptacle.
  • the differential pressure sensor is arranged in a projecting cylindrical portion of the sensor housing, which sits on the flat surface and protrudes with the projecting cylindrical portion in the receiving bore forming. This sensor housing is advantageously secured by means of the retaining clip on the flat surface on the housing.
  • centrifugal pump assembly consists of a centrifugal pump 1 with an electric motor 2 connected thereto, which drives via a shaft 3 in the pump housing 4 rotatably mounted about a rotation axis 5 gyro 6.
  • the electric motor 2 is shown for clarity purposes without terminal box and the engine electronics therein including the electronic speed controller.
  • the electric motor 2 has a motor housing 7, which is provided to the pump 1 at the periphery with a flange 8 and engages via a centering projection in a central housing opening 9 of the pump housing 4, which in this area circumferentially the opening 9 also provided with a flange 10 is.
  • Motor housing 7 and pump housing 4 are connected via the flanges 8, 10, which are encompassed by a clamping ring 11, positively and non-positively connected.
  • the pump housing 4 is an inline housing, ie suction port 12 and pressure port 13 are aligned.
  • the pump housing 4 is formed as a spiral housing and has an outgoing from the suction port 12 suction channel 14, which opens into a space 15 in which the impeller 6 is arranged, as shown in FIG Fig. 2 is shown.
  • This space 15 for the impeller is surrounded by a spirally widening and circumferential, open to the space 15 spiral channel 16 which opens into a pressure channel 17, which ends at the suction port 12.
  • the housing structure thus corresponds to the basic housing structure of an inline pump of the spiral housing type.
  • a receptacle 20 For receiving a differential pressure sensor, which is arranged in a projecting portion 18 of a sensor housing 19, a receptacle 20 is provided in the form of a bore within the pump housing 4.
  • the bore 20 is provided for receiving this projecting portion 18 incorporating a sealing cap 21.
  • the section 18 of the sensor housing 19 is designed such that pressure forces can be detected via the end-side end face on the one hand and a side face on the other hand through the sealing and elastic hat 21.
  • the receptacle 20 is formed as a stepped bore, d. H. at the end of the receptacle 20, the bore continues with a smaller diameter and forms there a first sensor channel 22, which opens into the suction channel 14.
  • This first sensor channel 22 thus connects the suction channel 14 with the receptacle 20 for the differential pressure sensor.
  • the receptacle forming bore 20 and the adjoining first sensor channel 22 lie in a plane transverse to the axis of rotation 5 of the impeller 6. In the present embodiment, the longitudinal center axis of the first sensor channel 22 and the axis of rotation 5 intersect.
  • a second sensor channel 23, which connects the receptacle 20 for the differential pressure sensor with the pressure-side interior of the pump housing, in particular the space 15, is formed by a bore which is arranged parallel to the axis of rotation 5 of the impeller 6. This bore is introduced through the central housing opening 9 and opens into the space 15, in particular the Fig. 2 it can be seen in addition to the impeller 6 within the area surrounded by the spiral channel 16 space 15, and with respect to the axis of rotation 5 and the flow direction about 45 ° before the point at which the spiral channel 16 opens into the pressure channel 17.
  • the receptacle 20 for the differential pressure sensor is arranged between the spirally encircling channel 16 and the suction channel 14, so that the required line connections within the pump housing 4 can be created by simple bores, namely the first sensor channel 22 and the second sensor channel 23 , It has surprisingly been found that the mouth of the second sensor channel 23 between the impeller 6 and the spiral channel 16 is metrologically particularly advantageous, as measured in this area the pressure values approached quite close to the static pressure at the pressure port 13, on the other hand, however, a unique Assignment to the flow rate values is possible.
  • the receptacle 20 is arranged for the differential pressure sensor within the pump housing 4, but this can also be outside of the pump housing.
  • the term "between spirally encircling channel 16 and the suction channel 14" is therefore to be understood broadly and includes an area which makes it possible to reach the suction-side and pressure-side space of the pump housing 4 from a location in or on the pump housing 4 with straight bores.
  • a perpendicular thereto arranged plane surface 24 provided on the outside of the pump housing, in which a arranged adjacent to the receptacle 20 threaded bore 25 is provided. Furthermore, one is Plane surface 26 arranged perpendicular to the plane surface 24 is provided on the outside of the pump housing 4 at the level of the spiral channel 16, in which a groove 27 is milled.
  • the flat surfaces 24 and 26 serve to abut the sensor housing 19, which is fastened by means of a holding bracket 28 on the pump housing 4, which is supported with one end in the groove 27 and is fastened at its other end by means of a screw 29 on the pump housing, in the Threaded hole 25 engages.
  • the mouth of the sensor channel 23 is arranged at an angle a of 90 °.
  • the angle a is determined by the longitudinal central axis 30 of the pump housing and the axis of rotation 5 of the gyro wheel 6 and in representation according to FIG. 8 , ie turning in the direction of the axis of rotation 5 to the left motor.
  • the invention is not limited to this angle a equal to 90 °, but can be arranged clockwise in angular ranges a between 0 ° and 120 ° anti-clockwise and in angular ranges ⁇ from 0 ° to 120 ° and this on the basis of FIG. 8 is shown.
  • the mouth is advantageously located between the spirally encircling channel 16 and the impeller, that is, a flow region influenced by the spiral channel.

Description

Die Erfindung betrifft ein Pumpengehäuse bzw. eine Naßlaufkreiselpumpe mit einem Pumpengehäuse mit den im Oberbegriff des Anspruchs 1 angegebenen Merkmalen.The invention relates to a pump housing or a Naßlaufkreiselpumpe with a pump housing with the features specified in the preamble of claim 1.

Pumpengehäuse der hier in Rede stehenden Spiralgehäusebauart werden mannigfaltig in der Technik eingesetzt. Derartige Pumpengehäuse werden beispielsweise für Heizungsumwälzpumpen verwendet, die heutzutage vielfach mit elektronischen Drehzahlstellern ausgestattet sind, welche einen weiten Anwendungsbereich eröffnen. Auch wenn die Betriebszustände der Pumpe über die elektrischen Daten des Motors erfasst werden, so ist doch für die Einbindung in eine Regelung regelmäßig eine Differenzdruckmessung erforderlich, welche zumindest die Druckdifferenz zwischen Saugseite und Druckseite der Pumpe erfasst. Um eine externe Verrohrung und lange Leitungsverbindungen zu vermeiden, zählt es zum Stand der Technik, einen solchen Differenzdruckaufnehmer am Pumpengehäuse selbst anzubringen.Pump housing of the spiral housing type in question here are widely used in the art. Such pump housings are used for example for heating circulation pumps, which are nowadays often equipped with electronic speed controllers, which open a wide range of applications. Even if the operating states of the pump are detected by the electrical data of the engine, a differential pressure measurement is regularly required for integration into a control system, which measures at least the pressure difference between the suction side and the pressure side of the pump. In order to avoid external piping and long line connections, it is state of the art to mount such a differential pressure transducer on the pump housing itself.

Aus DE 196 47 967 A1 ist es bekannt, innerhalb des Pumpengehäuses eine Aufnahme für einen Differenzdrucksensor anzuordnen, der über Kanäle innerhalb des Pumpengehäuses mit der Saugseite der Pumpe einerseits sowie der Druckseite andererseits verbunden ist. Die Aufnahme liegt innerhalb des Pumpengehäuses neben dem Saugstutzen und ist von der Seite zugänglich, an welcher der Motor an das Pumpengehäuse anschließt.Out DE 196 47 967 A1 It is known to arrange a receptacle for a differential pressure sensor within the pump housing, which is connected via channels within the pump housing with the suction side of the pump on the one hand and the pressure side on the other. The receptacle is located within the pump housing next to the suction nozzle and is accessible from the side at which the motor connects to the pump housing.

Aus EP 0 774 583 A1 ist es bekannt, neben dem Druckstutzen und Anschlussflansch an einer Rippe des Pumpengehäuses eine Montagebasis vorzusehen, welche eine in die Rippe ragende Bohrung als Aufnahme für den Differenzdrucksensor aufweist. Diese Bohrung ist über Kanäle mit dem Saugmund der Pumpe einerseits und mit dem Druckkanal im Bereich des Anschlussflansches andererseits verbunden.Out EP 0 774 583 A1 It is known to provide, in addition to the discharge nozzle and the connection flange on a rib of the pump housing, a mounting base, which has a projecting into the rib bore as a receptacle for the differential pressure sensor. This bore is connected via channels with the suction port of the pump on the one hand and with the pressure channel in the region of the connecting flange on the other.

Ein Nachteil dieser bekannten Anordnung ist, dass die Kanäle in dem typischerweise aus Guss bestehenden Pumpengehäuse mit eingeformt sein müssen, was werkzeugtechnisch aufwändig ist und insbesondere den Einsatz verlorener Kerne bedingt, was insbesondere in der Großserienfertigung erhebliche Kosten bedeutet.A disadvantage of this known arrangement is that the channels are molded in the pump housing, which is typically made of cast iron must be, which is technically complex and requires in particular the use of lost cores, which means considerable costs, especially in mass production.

Vor diesem Stand der Technik liegt der Erfindung die Aufgabe zugrunde, ein gattungsgemäßes Pumpengehäuse mit einer Aufnahme für einen Differenzdrucksensor so auszubilden, dass dieses fertigungstechnisch günstiger herzustellen ist. Darüber hinaus soll die Druckmessung druckseitig nach Möglichkeit an einer Stelle erfolgen, in der einerseits der Druck dem tatsächlich ausgangsseitig der Pumpe herrschenden Leitungsdruck weitgehend entspricht, die jedoch andererseits eine möglichst eindeutige Mengenzuordnung im QH-Diagramm erlaubt.Before this prior art, the present invention seeks to provide a generic pump housing with a receptacle for a differential pressure sensor so that this manufacturing technology is cheaper to manufacture. In addition, the pressure measurement should be done on the pressure side as far as possible at a point in the one hand, the pressure of the actual output side of the pump prevailing line pressure largely corresponds, but on the other hand allows the most unambiguous quantity assignment in the QH diagram.

Diese Aufgabe wird gemäß der Erfindung durch ein Pumpengehäuse mit den in Anspruch 1 angegebenen Merkmalen gelöst. Vorteilhafte Ausgestaltungen der Erfindung sind in den Unteransprüchen, der nachfolgenden Beschreibung und der Zeichnung angegeben.This object is achieved according to the invention by a pump housing having the features specified in claim 1. Advantageous embodiments of the invention are specified in the subclaims, the following description and the drawing.

Das erfindungsgemäße Pumpengehäuse ist ein Gehäuse der Spiralgehäusebauart und weist einen Saugkanal auf, der in einem Raum mündet, der zur Anordnung eines um eine Drehachse drehbaren Kreiselrades ausgebildet ist und der einen spiralförmig umlaufenden und zu diesem Raum hin offenen Kanal aufweist, nämlich den das Kreiselrad umgebenden Spiralkanal, der in einen Druckkanal mündet. Das Pumpengehäuse weist eine Aufnahme für einen Differenzdrucksensor auf und ist mit einem ersten Sensorkanal versehen, welcher die Aufnahme mit dem saugseitigen Inneren des Pumpengehäuses verbindet, sowie mit einem zweiten Sensorkanal, welcher die Aufnahme mit dem druckseitigen Inneren des Pumpengehäuses verbindet. Gemäß der Erfindung ist die Aufnahme für den Differenzdrucksensor im Bereich zwischen dem spiralförmig umlaufenden Kanal und dem Saugkanal angeordnet. Eine solche Anordnung ist besonders vorteilhaft, da sowohl bei gießtechnischer Formgebung als auch bei spanabhebender Formgebung geradlinig verlaufende Kanäle gebildet werden können, welche fertigungstechnisch vergleichsweise einfach herstellbar sind. Darüber hinaus ermöglicht die erfindungsgemäße Anordnung eine druckseitige Druckmessung in einem Bereich, welcher besonders vorteilhaft ist, wie weiter unten noch im Einzelnen ausgeführt ist.The pump housing according to the invention is a housing of the spiral housing type and has a suction channel, which opens into a space which is arranged to dispose a rotatable about a rotational axis impeller and which has a spirally encircling and open to this space channel, namely surrounding the impeller Spiral channel, which opens into a pressure channel. The pump housing has a receptacle for a differential pressure sensor and is provided with a first sensor channel which connects the receptacle with the suction-side interior of the pump housing, and with a second sensor channel which connects the receptacle with the pressure-side interior of the pump housing. According to the invention, the receptacle for the differential pressure sensor is arranged in the region between the spirally encircling channel and the suction channel. Such an arrangement is particularly advantageous since both in casting technology Forming as well as machined channels can be formed rectilinear channels, which are relatively easy to manufacture manufacturing technology. In addition, the arrangement according to the invention allows a pressure-side pressure measurement in a region which is particularly advantageous, as will be explained in more detail below.

Grundgedanke der erfindungsgemäßen Lösung ist es, im Pumpengehäuse eine Aufnahme für einen Differenzdrucksensor vorzusehen, die so angeordnet ist, dass sie mit geradlinigen Kanälen in das Innere des Pumpengehäuses, nämlich zur Saugseite einerseits und zur Druckseite andererseits hin geführt werden kann. Dabei kann bei der erfindungsgemäßen Anordnung die Aufnahme wahlweise innerhalb des Pumpengehäuses liegen oder auch außen am Pumpengehäuse, sei es nur als Montagebasis oder auch mit außen am Pumpengehäuse mündenden Kanälen. Besonders vorteilhaft liegt die erfindungsgemäße Aufnahme allerdings innerhalb des Pumpengehäuses, wie dies weiter unten noch im Einzelnen ausgeführt ist.The basic idea of the solution according to the invention is to provide a receptacle for a differential pressure sensor in the pump housing, which is arranged such that it can be guided with rectilinear channels into the interior of the pump housing, namely to the suction side on the one hand and to the pressure side on the other hand. In this case, in the arrangement according to the invention, the receptacle may be located either within the pump housing or outside the pump housing, be it only as a mounting base or even with outside of the pump housing opening channels. However, the receptacle according to the invention is particularly advantageously located inside the pump housing, as will be explained in more detail below.

Fertigungstechnisch besonders günstig ist es, wenn gemäß einer Weiterbildung der Erfindung die Sensorkanäle durch Bohrungen im Gehäuse gebildet sind. Derartige Bohrungen können kostengünstig gefertigt werden, insbesondere da derartige typischerweise aus Guss bestehenden Pumpengehäuse ohnehin in der Regel spanend nachbearbeitet werden müssen.From a manufacturing point of view, it is particularly favorable if, according to a development of the invention, the sensor channels are formed by bores in the housing. Such holes can be made inexpensively, especially since such typically consisting of cast pump housing must be reworked usually span anyway.

Vorteilhaft sind nicht nur die Sensorkanäle sondern ist auch die Aufnahme durch eine Bohrung im Gehäuse gebildet. Dabei kann der zweite Sensorkanal vorteilhaft durch eine quer zu der die Aufnahme bildenden Bohrung münden, wohingegen der erste Sensorkanal gemäß einer vorteilhaften Weiterbildung der Erfindung in Fortsetzung der die Aufnahme bildende Bohrung angeordnet ist, vorzugsweise in Flucht dazu, also mit der Aufnahme als Stufenbohrung ausgebildet ist.Not only the sensor channels are advantageous but also the receptacle is formed by a bore in the housing. In this case, the second sensor channel can advantageously lead through a transverse to the bore forming the receptacle, whereas the first sensor channel according to an advantageous embodiment of the invention in continuation of the recording forming hole is arranged, preferably in alignment with it, so is formed with the receptacle as a stepped bore.

Dabei ist es besonders günstig, wenn der erste Sensorkanal, also der Sensorkanal, welcher die Saugseite innerhalb des Pumpengehäuses mit der Aufnahme verbindet, im Wesentlichen senkrecht zur Drehachse des Kreiselrades angeordnet ist. Vorteilhaft ist der zweite Sensorkanal, welcher die Aufnahme mit der Druckseite innerhalb des Pumpengehäuses verbindet, im Wesentlichen parallel zur Drehachse des Kreiselrades angeordnet. In Kombination ergibt sich daraus, dass die Sensorkanäle senkrecht aufeinandertreffen und mit ihren Achsen so angeordnet sind, dass sie dort liegen, wo ohnehin Flächen spanabhebend zu bearbeiten sind.It is particularly advantageous if the first sensor channel, so the sensor channel which connects the suction side within the pump housing with the receptacle, is arranged substantially perpendicular to the axis of rotation of the impeller. Advantageously, the second sensor channel, which connects the receptacle with the pressure side within the pump housing, arranged substantially parallel to the axis of rotation of the impeller. In combination, the result is that the sensor channels meet vertically and are arranged with their axes so that they are located where surfaces are to be machined anyway.

Besonders vorteilhaft ist es, wenn der zweite Sensorkanal im druckseitigen Umfangsbereich des Kreiselrades mündet, und zwar dort speziell nahe dem in den Druckkanal mündenden Ende des spiralförmig umlaufenden Kanals. Es hat sich erstaunlicherweise gezeigt, dass gerade in diesem Bereich die druckseitige Druckerfassung besonders vorteilhaft ist, da einerseits eine eindeutige Zuordnung zur Durchflussmenge in der Regel möglich ist und andererseits der dort gemessene Druck recht nah an dem tatsächlich am Ausgang der Pumpe herrschenden statischen Druck heranreicht.It is particularly advantageous if the second sensor channel opens in the pressure-side peripheral region of the centrifugal wheel, specifically there near the end of the spirally encircling channel which opens into the pressure channel. It has surprisingly been found that especially in this area the pressure-side pressure detection is particularly advantageous, since on the one hand a clear assignment to the flow rate is usually possible and on the other hand, the pressure measured there comes very close to the pressure actually prevailing at the outlet of the pump static pressure.

Dabei ist es besonders vorteilhaft, wenn gemäß einer Weiterbildung der Erfindung die den zweiten Sensorkanal bildende Bohrung durch eine vorzugsweise zentrale Gehäuseöffnung hindurch gefertigt ist, mit welcher das Pumpengehäuse an ein Motorgehäuse anschließt und durch welche das Kreiselrad in das Pumpengehäuse eingeführt wird. Diese ohnehin vorhandene Öffnung, die in der Regel ebenfalls spanend zu bearbeiten ist, gestattet eine parallel zur Drehachse des Kreiselrades angeordnete Bohrung, welche quer zu der die Aufnahme bildende Bohrung münden kann. Es kann somit eine Bohrung geschaffen werden, bei der kein Ende verschlossen werden muss, wie dies beispielsweise erfolgen müsste, wenn diese Bohrung von außen durch die Gehäusewandung eingebracht würde.It is particularly advantageous if, according to an embodiment of the invention, the second sensor channel forming bore is made through a preferably central housing opening, with which the pump housing connects to a motor housing and through which the impeller is inserted into the pump housing. This already existing opening, which is usually also machined, allows a parallel to the axis of rotation of the impeller arranged bore, which transverse to the recording forming Hole can open. It can thus be created a hole in which no end must be closed, as would have to be done, for example, if this hole would be introduced from the outside through the housing.

Vorteilhaft ist die den zweiten Sensorkanal bildende Bohrung durch eine das Kreiselrad zur Gehäuseöffnung hin abdeckende Wand geführt. Es handelt sich bei dieser Gehäuseöffnung um die Vorbeschriebene, durch welche das Kreiselrad in das Pumpengehäuse eingeführt wird.Advantageously, the bore forming the second sensor channel is guided by a wall covering the rotor wheel towards the housing opening. It is in this case opening to the above, through which the impeller is inserted into the pump housing.

Die den zweiten Sensorkanal bildende Bohrung kann vorteilhaft auch von außen in das Pumpengehäuse gebohrt werden.The bore forming the second sensor channel can advantageously also be drilled from the outside into the pump housing.

Wenn die Aufnahme durch eine Bohrung im Pumpengehäuse gebildet ist, ist es vorteilhaft, wenn am äußeren Ende dieser Bohrung eine sich quer zur Bohrungsachse erstreckende Planfläche vorgesehen ist, die als Anlagefläche für ein Sensorgehäuse dienen kann. Parallel zur Bohrungsachse kann eine Gewindebohrung in dieser Planfläche vorgesehen sein, um ein Sensorgehäuse an der Planfläche mit einer Schraube zu befestigen.If the receptacle is formed by a bore in the pump housing, it is advantageous if at the outer end of this bore a transverse plane extending transversely to the bore axis is provided, which can serve as a contact surface for a sensor housing. Parallel to the bore axis, a threaded bore can be provided in this plane surface, in order to fasten a sensor housing to the plane surface with a screw.

Grundsätzlich könnte die Befestigung über eine zweite Gewindebohrung vorgesehen sein, so dass ein Sensorgehäuse zu beiden Seiten der Bohrung auf der Planfläche befestigbar ist. Gemäß einer vorteilhaften Weiterbildung der Erfindung ist jedoch neben der Planfläche und senkrecht dazu eine vorzugsweise durch eine Nut gebildete Abstützung für ein Ende eines Haltbügels für ein den Differenzdrucksensor aufnehmendes Sensorgehäuse gebildet, dessen anderes Ende mittels einer Schraube in der Gewindebohrung befestigbar ist. Auf diese Weise kann eine zweite Gewindebohrung eingespart werden, durch den Haltebügel, der einerseits in der Nut abgestützt und andererseits durch die Schraube formschlüssig und kraftschlüssig an der Planfläche gehalten ist, wird das darunter eingegliederte Sensorgehäuse sicher kraft- und formschlüssig gehalten.In principle, the fastening could be provided via a second threaded bore, so that a sensor housing can be fastened on both sides of the bore on the plane surface. According to an advantageous embodiment of the invention, however, in addition to the plane surface and perpendicular to a preferably formed by a groove support for one end of a retaining bracket for the differential pressure sensor receiving sensor housing is formed, the other end by means of a screw in the threaded bore can be fastened. In this way, a second threaded hole can be saved by the headband, on the one hand supported in the groove and on the other hand held by the screw positive and non-positively on the flat surface is, the integrated underneath sensor housing is securely held positively and positively.

Der Differenzdrucksensor selbst ist vorteilhaft unter Eingliederung einer abdichtenden Hutes in die die Aufnahme bildende Bohrung eingesetzt, sodass er mit der Flüssigkeit über die Sensorbohrungen nicht direkt sonder nur indirekt in Kontakt kommt. Der abdichtende Hut sorgt zugleich dafür, dass keine Flüssigkeit in die die Aufnahme bildende Bohrung gelangen kann. Bei dieser Konstruktion ist es vorteilhaft, wenn der Differenzdrucksensor in einem vorspringenden zylindrischen Abschnitt des Sensorgehäuses angeordnet ist, welches auf der Planfläche sitzt und mit dem vorspringenden zylindrischen Abschnitt in die die Aufnahme bildende Bohrung ragt. Dieses Sensorgehäuse ist vorteilhaft mittels des Haltebügels auf der Planfläche am Gehäuse befestigt.The differential pressure sensor itself is advantageously used by incorporating a sealing hat into the bore forming the receptacle so that it does not come into direct contact with the liquid via the sensor bores, but only indirectly. At the same time, the sealing hat ensures that no liquid can get into the bore forming the receptacle. In this construction, it is advantageous if the differential pressure sensor is arranged in a projecting cylindrical portion of the sensor housing, which sits on the flat surface and protrudes with the projecting cylindrical portion in the receiving bore forming. This sensor housing is advantageously secured by means of the retaining clip on the flat surface on the housing.

Die Erfindung ist nachfolgend anhand eines Ausführungsbeispiels näher erläutert. Es zeigen:

Fig. 1
in stark vereinfachter schematischer Seitenansicht eine Kreiselpumpe mit angeschlossenem Elektromotor,
Fig. 2
einen Schnitt längs der Schnittlinie II-II in Fig. 1,
Fig. 3
in perspektivischer Darstellung das Pumpengehäuse der Kreiselpumpe gemäß 1,
Fig. 4
eine Seitenansicht des Pumpengehäuses entsprechend der Darstellung nach Fig. 1 ohne Motor und Laufrad,
Fig. 5
einen Schnitt längs der Schnittlinie V-V in Fig. 4,
Fig. 6
in perspektivischer Explosionsdarstellung das Pumpengehäuse gemäß den vorherigen Figuren mit Differenzdrucksensor und zugehörigen Bauteilen,
Fig. 7
eine perspektivische Darstellung des Pumpengehäuses mit eingebautem Differenzdrucksensor und
Fig. 8
eine Ansicht des Pumpengehäuses von der motorabgewandten Seite.
The invention is explained in more detail with reference to an embodiment. Show it:
Fig. 1
in a highly simplified schematic side view of a centrifugal pump with connected electric motor,
Fig. 2
a section along the section line II-II in Fig. 1 .
Fig. 3
1 is a perspective view of the pump housing of the centrifugal pump according to FIG. 1,
Fig. 4
a side view of the pump housing as shown by Fig. 1 without motor and impeller,
Fig. 5
a section along the section line VV in Fig. 4 .
Fig. 6
in a perspective exploded view of the pump housing according to the previous figures with differential pressure sensor and associated components,
Fig. 7
a perspective view of the pump housing with built-in differential pressure sensor and
Fig. 8
a view of the pump housing from the motor side facing away.

Das in den Fig. 1 und 2 dargestellte Kreiselpumpenaggregat besteht aus einer Kreiselpumpe 1 mit einem daran angeschlossenen Elektromotor 2, der über eine Welle 3 ein im Pumpengehäuse 4 drehbar um eine Drehachse 5 angeordnetes Kreiselrad 6 antreibt. Der Elektromotor 2 ist zu Übersichtszwecken ohne Klemmenkasten und der darin befindlichen Motorelektronik einschließlich des elektronischen Drehzahlstellers dargestellt.That in the Fig. 1 and 2 illustrated centrifugal pump assembly consists of a centrifugal pump 1 with an electric motor 2 connected thereto, which drives via a shaft 3 in the pump housing 4 rotatably mounted about a rotation axis 5 gyro 6. The electric motor 2 is shown for clarity purposes without terminal box and the engine electronics therein including the electronic speed controller.

Der Elektromotor 2 weist ein Motorgehäuse 7 auf, welches zur Pumpe 1 hin am Umfang mit einem Flansch 8 versehen ist und über einen Zentriervorsprung in eine zentrale Gehäuseöffnung 9 des Pumpengehäuses 4 eingreift, das in diesem Bereich umfänglich der Öffnung 9 ebenfalls mit einem Flansch 10 versehen ist. Motorgehäuse 7 und Pumpengehäuse 4 sind über die Flansche 8, 10, die von einem Spannring 11 umgriffen sind, form- und kraftschlüssig miteinander verbunden.The electric motor 2 has a motor housing 7, which is provided to the pump 1 at the periphery with a flange 8 and engages via a centering projection in a central housing opening 9 of the pump housing 4, which in this area circumferentially the opening 9 also provided with a flange 10 is. Motor housing 7 and pump housing 4 are connected via the flanges 8, 10, which are encompassed by a clamping ring 11, positively and non-positively connected.

Bei dem Pumpengehäuse 4 handelt es sich um ein Inlinegehäuse, d. h. Sauganschluss 12 und Druckanschluss 13 fluchten zueinander. Das Pumpengehäuse 4 ist als Spiralgehäuse ausgebildet und weist einen vom Sauganschluss 12 ausgehenden Saugkanal 14 auf, welcher in einem Raum 15 mündet, in welchem das Kreiselrad 6 angeordnet ist, wie dies anhand von Fig. 2 dargestellt ist. Dieser Raum 15 für das Kreiselrad wird von einem spiralförmig aufweitend und umlaufenden, zum Raum 15 hin offenen Spiralkanal 16 umgeben, der in einen Druckkanal 17 mündet, welcher am Sauganschluss 12 endet. Der Gehäuseaufbau entspricht also dem grundsätzlichen Gehäuseaufbau einer Inlinepumpe der Spiralgehäusebauart.In the pump housing 4 is an inline housing, ie suction port 12 and pressure port 13 are aligned. The pump housing 4 is formed as a spiral housing and has an outgoing from the suction port 12 suction channel 14, which opens into a space 15 in which the impeller 6 is arranged, as shown in FIG Fig. 2 is shown. This space 15 for the impeller is surrounded by a spirally widening and circumferential, open to the space 15 spiral channel 16 which opens into a pressure channel 17, which ends at the suction port 12. The housing structure thus corresponds to the basic housing structure of an inline pump of the spiral housing type.

Zur Aufnahme eines Differenzdrucksensors, der in einen vorspringenden Abschnitt 18 eines Sensorgehäuses 19 angeordnet ist, ist innerhalb des Pumpengehäuses 4 eine Aufnahme 20 in Form einer Bohrung vorgesehen. Die Bohrung 20 ist zur Aufnahme dieses vorspringenden Abschnitts 18 unter Eingliederung eines abdichtenden Hutes 21 vorgesehen. Der Abschnitt 18 des Sensorgehäuses 19 ist so ausgebildet, dass über die endseitige Stirnfläche einerseits sowie eine Seitenfläche andererseits durch den abdichtenden und elastischen Hut 21 hindurch Druckkräfte erfasst werden können.For receiving a differential pressure sensor, which is arranged in a projecting portion 18 of a sensor housing 19, a receptacle 20 is provided in the form of a bore within the pump housing 4. The bore 20 is provided for receiving this projecting portion 18 incorporating a sealing cap 21. The section 18 of the sensor housing 19 is designed such that pressure forces can be detected via the end-side end face on the one hand and a side face on the other hand through the sealing and elastic hat 21.

Die Aufnahme 20 ist als Stufenbohrung ausgebildet, d. h. am Ende der Aufnahme 20 setzt sich die Bohrung mit geringerem Durchmesser fort und bildet dort einen ersten Sensorkanal 22, welcher im Saugkanal 14 mündet. Dieser erste Sensorkanal 22 verbindet somit den Saugkanal 14 mit der Aufnahme 20 für den Differenzdrucksensor. Die die Aufnahme bildende Bohrung 20 sowie der daran anschließende erste Sensorkanal 22 liegen in einer Ebene quer zur Drehachse 5 des Kreiselrades 6. Im vorliegenden Ausführungsbeispiel schneiden sich die Längsmittelachse des ersten Sensorkanals 22 und die Drehachse 5.The receptacle 20 is formed as a stepped bore, d. H. at the end of the receptacle 20, the bore continues with a smaller diameter and forms there a first sensor channel 22, which opens into the suction channel 14. This first sensor channel 22 thus connects the suction channel 14 with the receptacle 20 for the differential pressure sensor. The receptacle forming bore 20 and the adjoining first sensor channel 22 lie in a plane transverse to the axis of rotation 5 of the impeller 6. In the present embodiment, the longitudinal center axis of the first sensor channel 22 and the axis of rotation 5 intersect.

Ein zweiter Sensorkanal 23, welcher die Aufnahme 20 für den Differenzdrucksensor mit dem druckseitigen Inneren des Pumpengehäuses, insbesondere dem Raum 15 verbindet, ist durch eine Bohrung gebildet, welche parallel zur Drehachse 5 des Kreiselrades 6 angeordnet ist. Diese Bohrung ist durch die zentrale Gehäuseöffnung 9 hindurch eingebracht und mündet im Raum 15, wie insbesondere der Fig. 2 zu entnehmen ist, neben dem Kreiselrad 6 innerhalb des durch den Spiralkanal 16 umgebenen Raumes 15, und zwar bezogen auf die Drehachse 5 und die Fließrichtung etwa 45° vor der Stelle, an welcher der Spiralkanal 16 in den Druckkanal 17 mündet.A second sensor channel 23, which connects the receptacle 20 for the differential pressure sensor with the pressure-side interior of the pump housing, in particular the space 15, is formed by a bore which is arranged parallel to the axis of rotation 5 of the impeller 6. This bore is introduced through the central housing opening 9 and opens into the space 15, in particular the Fig. 2 it can be seen in addition to the impeller 6 within the area surrounded by the spiral channel 16 space 15, and with respect to the axis of rotation 5 and the flow direction about 45 ° before the point at which the spiral channel 16 opens into the pressure channel 17.

Wie die vorstehenden Ausführungen zeigen, ist die Aufnahme 20 für den Differenzdrucksensor zwischen dem spiralförmig umlaufenden Kanal 16 und dem Saugkanal 14 angeordnet, sodass durch einfache Bohrungen, nämlich den ersten Sensorkanal 22 und den zweiten Sensorkanal 23 die erforderlichen Leitungsverbindungen innerhalb des Pumpengehäuses 4 geschaffen werden können. Dabei hat sich erstaunlicherweise gezeigt, dass die Mündung des zweiten Sensorkanals 23 zwischen dem Kreiselrad 6 und dem Spiralkanal 16 messtechnisch besonders vorteilhaft ist, da bei Messung in diesem Bereich die ermittelten Druckwerte recht nah an den statischen Druck am Druckanschluss 13 herankommen, andererseits jedoch eine eindeutige Zuordnung zu den Durchflussmengenwerten möglich ist.As the above explanations show, the receptacle 20 for the differential pressure sensor is arranged between the spirally encircling channel 16 and the suction channel 14, so that the required line connections within the pump housing 4 can be created by simple bores, namely the first sensor channel 22 and the second sensor channel 23 , It has surprisingly been found that the mouth of the second sensor channel 23 between the impeller 6 and the spiral channel 16 is metrologically particularly advantageous, as measured in this area the pressure values approached quite close to the static pressure at the pressure port 13, on the other hand, however, a unique Assignment to the flow rate values is possible.

In dem vorstehend beschriebenen Ausführungsbeispiel ist die Aufnahme 20 für den Differenzdrucksensor innerhalb des Pumpengehäuses 4 angeordnet, diese kann jedoch auch außerhalb des Pumpengehäuses liegen. Der Begriff "zwischen spiralförmig umlaufenden Kanal 16 und dem Saugkanal 14" ist daher weit zu fassen und umfasst ein Gebiet, welches es ermöglicht, von einem Ort im oder am Pumpengehäuse 4 mit gradlinigen Bohrungen den saugseitigen und den druckseitigen Raum des Pumpengehäuses 4 zu erreichen.In the embodiment described above, the receptacle 20 is arranged for the differential pressure sensor within the pump housing 4, but this can also be outside of the pump housing. The term "between spirally encircling channel 16 and the suction channel 14" is therefore to be understood broadly and includes an area which makes it possible to reach the suction-side and pressure-side space of the pump housing 4 from a location in or on the pump housing 4 with straight bores.

Bei der vorstehend beschrieben Ausführungsform ist, wie insbesondere der Fig. 6 zu entnehmen ist, am äußeren Ende der Aufnahme 20 eine senkrecht dazu angeordnete Planfläche 24 an der Außenseite des Pumpengehäuses vorgesehen, in welcher eine neben der Aufnahme 20 angeordnete Gewindebohrung 25 vorgesehen ist. Weiterhin ist eine senkrecht zur Planfläche 24 angeordnete Planfläche 26 an der Außenseite des Pumpengehäuses 4 in Höhe des Spiralkanals 16 vorgesehen, in welche eine Nut 27 eingefräst ist. Die Planflächen 24 und 26 dienen zur Anlage des Sensorgehäuses 19, welches mittels eines Haltebügels 28 am Pumpengehäuse 4 befestigt ist, der sich mit einem Ende in der Nut 27 abstützt und mit seinem anderen Ende mittels einer Schraube 29 am Pumpengehäuse befestigt ist, die in der Gewindebohrung 25 eingreift.In the embodiment described above, in particular the Fig. 6 it can be seen at the outer end of the receptacle 20 a perpendicular thereto arranged plane surface 24 provided on the outside of the pump housing, in which a arranged adjacent to the receptacle 20 threaded bore 25 is provided. Furthermore, one is Plane surface 26 arranged perpendicular to the plane surface 24 is provided on the outside of the pump housing 4 at the level of the spiral channel 16, in which a groove 27 is milled. The flat surfaces 24 and 26 serve to abut the sensor housing 19, which is fastened by means of a holding bracket 28 on the pump housing 4, which is supported with one end in the groove 27 and is fastened at its other end by means of a screw 29 on the pump housing, in the Threaded hole 25 engages.

In dem anhand der Figuren 1 bis 7 dargestellten Ausführungsbeispiel ist die Mündung des Sensorkanals 23 in einem Winkel a von 90° angeordnet. Der Winkel a ist durch die Längsmittelachse 30 des Pumpengehäuses und die Drehachse 5 des Kreiselrades 6 bestimmt und in Darstellung gemäß Figur 8, also in Richtung der Drehachse 5 zum Motor hin links drehend.In the basis of the FIGS. 1 to 7 illustrated embodiment, the mouth of the sensor channel 23 is arranged at an angle a of 90 °. The angle a is determined by the longitudinal central axis 30 of the pump housing and the axis of rotation 5 of the gyro wheel 6 and in representation according to FIG. 8 , ie turning in the direction of the axis of rotation 5 to the left motor.

Die Erfindung ist nicht auf diesen Winkel a gleich 90° beschränkt, sondern kann in Winkelbereichen a zwischen 0° und 120° linksdrehend sowie in Winkelbereichen β von 0° bis 120° rechtsdrehend angeordnet sein sowie dies anhand von Figur 8 dargestellt ist. Die Mündung liegt dabei vorteilhaft zwischen dem spiralförmig umlaufenden Kanal 16 und dem Laufrad, also einem durch den Spiralkanal beeinflussten Strömungsbereich. Dabei hat sich gezeigt, dass wenn die Öffnung für den Kanal 23 im Bereich β zwischen 0° und 120° angeordnet ist, dass sich bei der Messung Q/H-Kurven ergeben, die die Q/H-Kurve, wie sie zwischen den Anschlüssen 12 und 13 der Pumpe gemessen wird, im unteren Bereich schneidet, wohingegen im Winkelbereich a zwischen 0° und 120° sich Q/H-Kurven ergeben, die nahezu vollständig unterhalb der Q/H-Kurve liegen, wie sie zwischen den Anschlüssen 12 und 13 gemessen, wird.The invention is not limited to this angle a equal to 90 °, but can be arranged clockwise in angular ranges a between 0 ° and 120 ° anti-clockwise and in angular ranges β from 0 ° to 120 ° and this on the basis of FIG. 8 is shown. The mouth is advantageously located between the spirally encircling channel 16 and the impeller, that is, a flow region influenced by the spiral channel. It has been shown that when the opening for the channel 23 is arranged in the range β between 0 ° and 120 ° that result in the measurement Q / H curves, the Q / H curve as they are between the terminals 12 and 13 of the pump is in the lower region intersects, whereas in the angular range a between 0 ° and 120 ° Q / H curves arise that are almost completely below the Q / H curve as they are between the terminals 12 and 13 is measured.

BezugszeichenlisteLIST OF REFERENCE NUMBERS

11
Kreiselpumperotary pump
22
Elektromotorelectric motor
33
Wellewave
44
Pumpengehäusepump housing
55
Drehachseaxis of rotation
66
Kreiselradimpeller
77
Motorgehäusemotor housing
88th
Flansch von 7Flange of 7
99
Gehäuseöffnunghousing opening
1010
Flansch von 4Flange of 4
1111
Spannringclamping ring
1212
Sauganschlusssuction
1313
Druckanschlusspressure connection
1414
Saugkanalsuction
1515
Raumroom
1616
Spiralkanalspiral channel
1717
Druckkanalpressure channel
1818
Vorspringender AbschnittProjecting section
1919
Sensorgehäusesensor housing
2020
Aufnahme, BohrungRecording, drilling
2121
abdichtender Hutsealing hat
2222
Erster SensorkanalFirst sensor channel
2323
Zweiter SensorkanalSecond sensor channel
2424
Planfläche quer zur Bohrung 20Plane across the bore 20
2525
Gewindebohrungthreaded hole
126126
Planfläche parallel zur Bohrung 20Plane parallel to the bore 20
2727
Nut in 26Groove in 26th
2828
Haltebügelheadband
2929
Schraubescrew

Claims (18)

  1. A pump housing of the spiral housing construction type with a suction channel (14) running out into a space (15) which is designed for arranging an impeller (6) rotatable about a rotation axis (5) and comprises a spirally peripheral channel (16) open to the space and running out into a pressure channel (17), with a receiver (20) for a differential pressure sensor and with a first sensor channel (22) which connects the receiver (20) to the suction-side interior of the pump housing (4), and with a second sensor channel (23) which connects the receiver (20) to the pressure-side interior of the pump housing (4), characterised in that the receiver (20) for the differential pressure sensor is arranged between the spirally peripheral channel (16) and the suction channel (14).
  2. A pump housing according to claim 1, characterised in that the sensor channels (22, 23) are formed in each case by bores in the housing (4).
  3. A pump housing according to claim 1 or 2, characterised in that the receiver (20) is formed by a bore in the housing (4).
  4. A pump housing according to one of the preceding claims, characterised in that the second sensor channel (23) runs out transversely to the bore forming the receiver (20).
  5. A pump housing according to one of the preceding claims, characterised in that the bore forming the first sensor channel (22) is arranged in the continuation of the bore forming the receiver (20).
  6. A pump housing according to one of the preceding claims, characterised in that the first sensor channel (22) is arranged essentially perpendicularly to the rotation axis (5) of the impeller (6).
  7. A pump housing according to one of the preceding claims, characterised in that the second sensor channel (23) is arranged essentially parallel to the rotation axis (5) of the impeller (6).
  8. A pump housing according to one of the preceding claims, characterised in that the second sensor channel (23) runs out in the pressure-side peripheral region of the impeller (6).
  9. A pump housing according to one of the preceding claims, characterised in that the bore forming the second sensor channel (23) is manufactured through a housing opening (9), with which housing opening the pump housing (4) connects to a motor housing (7) and through which housing opening the impeller (6) is introduced into the pump housing (4).
  10. A pump housing according to one of the preceding claims, characterised in that the bore forming the second sensor channel is led through a wall covering the impeller to the housing opening.
  11. A pump housing according to one of the preceding claims, characterised in that the bore forming the second sensor channel is drilled into the pump housing from the outside.
  12. A pump housing according to one of the preceding claims, characterised in that a plane surface (24) extending transversely to the bore axis is provided on the outer end of the bore forming the receiver (20).
  13. A pump housing according to claim 12, characterised in that a threaded bore (25) is provided in the plane surface (24), parallel to the bore axis.
  14. A pump housing according to claim 13, characterised in that a support for one end of a holding bracket (28) for a sensor housing (19) receiving the differential pressure sensor, is formed next to the plane surface (24) and perpendicularly thereto, and the other end of said holding bracket can be fastened in the threaded bore (25) by way of a screw (29).
  15. A pump housing according to claim 14, characterised in that the support for the one end of the holding bracket (28) is formed by a groove (27).
  16. A pump housing according to one of the preceding claims, characterised in that the differential pressure sensor is inserted into the bore forming the receiver (20) amid the integration of a sealing cap (21).
  17. A pump housing according to claim 14, characterised in that the differential pressure sensor is arranged in a projecting section (18) of the sensor housing (19) which is seated on the plane surface (24), projects with the projecting section (18) into the bore forming the receiver (20) and is fastened on the plane surface (24) on the housing by way of the holding bracket (28).
  18. A wet-running centrifugal pump (1) with a pump housing (4) according to one of the preceding claims, with an impeller rotatably mounted therein.
EP12154493.6A 2012-02-08 2012-02-08 Pump casing Active EP2626567B2 (en)

Priority Applications (4)

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EP12154493.6A EP2626567B2 (en) 2012-02-08 2012-02-08 Pump casing
PCT/EP2013/050861 WO2013117402A1 (en) 2012-02-08 2013-01-17 Pump housing
CN201380008576.6A CN104114873B (en) 2012-02-08 2013-01-17 Pump case
US14/377,282 US9863436B2 (en) 2012-02-08 2013-01-17 Pump housing

Applications Claiming Priority (1)

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EP2626567B1 true EP2626567B1 (en) 2016-07-13
EP2626567B2 EP2626567B2 (en) 2019-10-16

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EP0774583A1 (en) 1995-11-14 1997-05-21 Grundfos A/S Casing for a centrifugal pump
DE19647967A1 (en) 1996-11-20 1998-05-28 Wilo Gmbh Pump esp. motor driven centrifugal pump with sensor determining pressure differences
DE29717937U1 (en) 1997-10-09 1997-11-27 Grundfos As Arrangement for pressure measurement
EP1413769A1 (en) 2002-10-22 2004-04-28 Wilo Ag Pump with connection line to measuring points
EP1698877A1 (en) 2005-03-05 2006-09-06 Grundfos Management A/S Differential pressure sensor assembly and associated differential pressure sensor

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
RU2739933C2 (en) * 2016-10-27 2020-12-29 Зульцер Мэнэджмент Аг Method and design for centrifugal pump spiral casing condition monitoring

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WO2013117402A1 (en) 2013-08-15
US20150016980A1 (en) 2015-01-15
EP2626567A1 (en) 2013-08-14
US9863436B2 (en) 2018-01-09
EP2626567B2 (en) 2019-10-16
CN104114873B (en) 2016-08-17
CN104114873A (en) 2014-10-22

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