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EP1349997A1 - Electronic frequency converter comprising a cooling circuit - Google Patents

Electronic frequency converter comprising a cooling circuit

Info

Publication number
EP1349997A1
EP1349997A1 EP02719689A EP02719689A EP1349997A1 EP 1349997 A1 EP1349997 A1 EP 1349997A1 EP 02719689 A EP02719689 A EP 02719689A EP 02719689 A EP02719689 A EP 02719689A EP 1349997 A1 EP1349997 A1 EP 1349997A1
Authority
EP
European Patent Office
Prior art keywords
housing
converter
frequency converter
vibrator
frequency
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.)
Granted
Application number
EP02719689A
Other languages
German (de)
French (fr)
Other versions
EP1349997B1 (en
Inventor
Michael Steffen
Christian Glanz
Dirk Sibila
Thomas Müller
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Wacker Neuson SE
Original Assignee
Wacker Construction Equipment AG
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Wacker Construction Equipment AG filed Critical Wacker Construction Equipment AG
Publication of EP1349997A1 publication Critical patent/EP1349997A1/en
Application granted granted Critical
Publication of EP1349997B1 publication Critical patent/EP1349997B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E04—BUILDING
    • E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/06—Solidifying concrete, e.g. by application of vacuum before hardening
    • E04G21/08—Internal vibrators, e.g. needle vibrators

Definitions

  • the invention relates to an electronic frequency converter according to the preamble of claim 1, which is used with a high-frequency internal vibrator for compacting concrete.
  • vibrations in the form of high-frequency vibrations are introduced into the fresh concrete beds by vibrators.
  • the most frequently used vibrators on construction sites are the so-called internal vibrators or internal vibrators.
  • an internal vibrator for compacting concrete which is operated with a high-frequency electric motor.
  • a frequency converter is combined with an actuating switch of the electric motor to form a miniaturized unit and housed in a switch housing.
  • additional frequency converters can be dispensed with in comparison to conventional high-frequency internal vibrators, as a result of which the handling of this internal vibrator is considerably simplified for an operator.
  • the radius of use of the internal vibrator is improved as a result of the reduced dimensions of the switch housing and the associated decrease in weight.
  • the dimensions of the switch housing cannot always be completely small.
  • ner building electronic frequency converter can be adapted because a sufficiently large dissipation of heat, which is generated during operation of the frequency converter, must be ensured by means of convection over the surface of the switch housing.
  • a further downsizing of the switch housing would have the disadvantage that insufficient heat dissipation to the surroundings is guaranteed and the frequency converter can therefore fail as a result of thermal overload.
  • the invention is based on the object of specifying an electronic frequency converter which can be operated in a thermally stable manner and thus can be used without interference in practical operation.
  • An electronic frequency converter according to the invention for a high-frequency internal vibrator for compacting concrete is characterized by a cooling circuit with a cooling medium contained therein, and a first heat exchanger integrated into the cooling circuit for transmission heat generated in the converter housing to the cooling medium and by a second heat exchanger integrated in the cooling circuit for transferring heat absorbed by the cooling medium to the outside.
  • the cooling circuit and the first and second heat exchangers integrated therein bring about very good cooling of the frequency converter by efficiently dissipating heat from the converter housing to the outside, so that the frequency converter is protected against failure due to heat build-up in the converter housing.
  • Conventional heat dissipation via convection is superimposed by heat transfer to the cooling medium and a subsequent heat dissipation to the outside, so that, compared to known frequency converters without a cooling circuit, it is possible to reduce the size of a surface of the converter housing without impairing the operational reliability of the frequency converter.
  • a further downsizing of the converter housing and, associated therewith, improved handling of the frequency converter when used in practice can thus be achieved.
  • the first heat exchanger is arranged on or on the converter housing.
  • the first heat exchanger is assigned to heat-generating components of the frequency converter, which are accommodated in the converter housing, in such a way that heat generated by these components can be transferred to the cooling medium through the first heat exchanger.
  • the second heat exchanger is provided separately from the converter housing in order to transmit heat absorbed by the cooling medium to the outside.
  • a particularly advantageous embodiment of the invention is characterized in that the aforementioned part of the cooling circuit, the z. B. can be carried out in the form of pipes, is formed within the converter housing.
  • This part of the cooling circuit is therefore very well shielded from external influences, which can occur, for example, in the form of impacts.
  • it can also be accommodated in the converter housing. It is possible to either arrange the first heat exchanger in the vicinity of the heat-generating components, or alternatively to attach it directly to these heat-generating components.
  • the electronic frequency converter can be made very robust by integrating the first heat exchanger and part of the cooling circuit within the converter housing.
  • the cooling medium used together with the cooling circuit can consist of a cooling liquid or alternatively a cooling gas.
  • the cooling medium is circulated in the cooling circuit by a pump, a throughput of the pump being adapted accordingly to the dimensions of the first and second heat exchangers.
  • the converter housing is combined with the pump to form a structural unit. It is particularly advantageous that the pump is integrated in the converter housing in order to be protected from external influences.
  • a hand switch for actuating the electronic frequency converter is integrated in the converter housing.
  • the frequency converter can be switched on or off directly on the converter housing in a simple manner.
  • the electronic frequency converter can be operated with alternating current.
  • the frequency converter can be connected directly to the luminous flux network with, for example, 230 V and 50 Hz via a normal plug.
  • a particularly advantageous embodiment of the invention provides a high-frequency internal vibrator for compacting concrete, which has a vibrator housing, in which an unbalanced mass and an electric motor operating at a higher frequency than the mains for driving the unbalanced mass, a frequency converter accommodated in a converter housing for feeding of the electric motor and a protective tube connecting the vibrator housing and the converter housing and is characterized in that the frequency converter is an electronic frequency converter according to the invention.
  • a further part of the cooling circuit of the frequency converter is formed in the protective hose and in the vibrator housing, the second heat exchanger being arranged within the vibrator housing.
  • the cooling medium circulated by the pump flows through the second heat exchanger, as a result of which the heat absorbed by the cooling medium is transferred to the vibrator housing.
  • a further particularly advantageous embodiment of the high-frequency internal vibrator is characterized by a detection device, by means of which a change in a motor current supplied to the electric motor can be detected, and by a temperature protection switching device that can be controlled by the detection device, for switching the pump on and off.
  • the vibrator housing is not continuously immersed in the concrete to be compacted, but is optionally pulled out of the concrete briefly so that it can be immersed again at another point. If, during operation, the vibrator housing is not inside the concrete, but instead hangs freely in the air, very high temperatures develop immediately in the vibrator housing, whereby the motor current supplied to the electric motor decreases.
  • the pump can be switched off by the temperature protection switching device when the motor current is detected by the detection device.
  • the resulting interruption of the circulation of the cooling medium prevents the heat generated by the electric motor in the vibrator housing and in this case transferred to the cooling medium via the second heat exchanger as a result of the circulation of the cooling medium being transported back to the first heat exchanger, which is disadvantageous additional heating of the frequency converter, which at that time was not very stressed, would result.
  • the pump can be switched on by the temperature protection switching device in the event of an increase in the motor current detected by the detection device, so that an advantageous heat transfer from the vibrator housing to the cool concrete can take place.
  • FIG. 1 shows a basic structure of a high-frequency internal vibrator with an electronic frequency converter according to the invention.
  • the electronic frequency converter 1 shown in the figure has a converter housing 2 and a first heat exchanger 3, which is arranged inside the converter housing 2 in the vicinity of heat-generating components (not shown) of the frequency converter 1.
  • the first heat exchanger 3 can be attached to a wall of the converter housing 2, for example by means of a holder. Alternatively, the first heat exchanger 3 can be attached directly to the heat-generating components.
  • the arrangement in the interior of the converter housing 2 means that the first heat exchanger 3 is very well protected against damaging external influences, which cannot be excluded when used on a construction site.
  • the frequency converter 1 according to the invention also has a cooling circuit 4, in which the first heat exchanger 3 is integrated.
  • the cooling circuit 4 is a
  • Contain cooling medium (not shown), which is a cooling liquid or a cooling gas.
  • the heat-generating components th of the frequency converter 1 generated heat transferred to the cooling medium.
  • the frequency converter 1 also has a pump 5, which is combined with the converter housing 2 to form a structural unit.
  • the pump 5 is accommodated in the converter housing 2 in the same way as the first heat exchanger 3 for protection against external damage.
  • the above-mentioned cooling circuit 4 is formed by a pipe or hose system, a part of the cooling circuit 4 running inside the converter housing 2.
  • the pipes which are generally sensitive to impacts, are effectively protected against damage.
  • the pump 5 is connected to the cooling circuit 4 in such a way that the cooling medium can be circulated by it in the cooling circuit 4.
  • the frequency converter 1 is part of a high-frequency internal vibrator, which also has a vibrator housing 6 and a protective tube 7.
  • an unbalanced mass and an electric motor (not shown) for driving the unbalanced mass are arranged in a known manner.
  • the electric motor is supplied with a voltage by the frequency converter 1, the frequency of which is preferably in the range of 200 Hz and thus above the usual mains frequency of 50 Hz.
  • One end of the protective hose 7 is connected to the vibrator housing 6, while another end of the protective hose 7 is attached to the converter housing 2 via a coupling device 8.
  • the protective tube 7 is flexible in terms of ease of handling, and its outer diameter is dimensioned such that it can be easily gripped by an operator, so that it can also serve as an operating tube.
  • the protective tube 7 in a variant of the frequency converter 1 according to the invention can be removed in a simple manner from the vibrating housing 6 or via the coupling device 8 from the converter housing 2.
  • a power supply cable 9 with a plug 10 is led out on one side of the converter housing 2.
  • the electronic frequency converter 1 can be supplied with conventional mains alternating current via the power supply cable 9 and the plug 10. driven, increasing the normal AC frequency from 50 Hz to values of up to 200 Hz.
  • electrical lines (not shown) are received, which connect an output of the frequency converter 1 to the electric motor arranged in the vibrating housing 6. As a result, the electric motor can be supplied with a high-frequency voltage output by the frequency converter 1.
  • the frequency converter 1 also has a second heat exchanger 11 integrated in the cooling circuit 4, which is arranged inside the vibrator housing 6. A part of the cooling circuit 4 runs inside the protective tube 7 and leads from the converter housing 2 to the second heat exchanger 11.
  • the operation of the pump 5 ensures that the cooling medium contained in the cooling circuit 4 passes from the first heat exchanger 3 through the protective hose 7 to the second heat exchanger 11.
  • the heat transferred to the cooling medium by the first heat exchanger 3 is now released to the vibrator housing 6 via the second heat exchanger 11.
  • the cooling medium then circulates back through the protective tube 7 in the direction of the first heat exchanger 3.
  • the vibrator housing 6 is immersed in the still fresh concrete 12 to be processed during operation. Since the concrete generally has a relatively low temperature in relation to the frequency converter 1, the heat transferred from the second heat exchanger 11 to the vibrator housing 6 can then be efficiently conducted away to the cooling concrete 12.
  • the frequency converter 1 according to the invention explained above can be operated with great certainty in a thermally non-critical state over a long period of time.
  • the external dimensions of the converter housing 2 can be further reduced without the frequency converter 1 malfunctioning or failing as a result of insufficient convection cooling of the converter housing 2.

Landscapes

  • Engineering & Computer Science (AREA)
  • Architecture (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)

Abstract

The invention relates to an electronic frequency converter (1) which is used with a high frequency immersion vibrator in order to compact concrete. Said frequency converter comprises a cooling circuit (4) containing a cooling medium; a first heat exchanger (3) which is integrated into said cooling circuit (4) and is used to transmit heat generated in the housing (2) of the frequency converter to the cooling medium; and a second heat exchanger (11) which is integrated into the cooling circuit (4) and is used to outwardly transmit heat absorbed by the cooling medium. The second heat exchanger (11) is received in a vibrator housing (6) of the high frequency immersion vibrator. If the vibrator housing (6) is immersed in concrete (12), the heat produced in the converter housing (2) can be conducted away to the concrete (12).

Description

Elektronischer Frequenzumformer mit einem Kühlkreislauf Electronic frequency converter with a cooling circuit
Die Erfindung betrifft einen elektronischen Frequenzumformer gemäß dem Oberbegriff von Patentanspruch 1, der mit einem Hochfrequenz- Innenvibrator zum Ver- dichten von Beton eingesetzt wird.The invention relates to an electronic frequency converter according to the preamble of claim 1, which is used with a high-frequency internal vibrator for compacting concrete.
Bei der Verarbeitung von Frischbetonschüttungen ist es zur Erzielung von ausreichenden Betonfestigkeiten und -dichtigkeiten unverzichtbar, Gefügestörungen und Lufteinschlüsse, die beim Schütten des Betons entstehen, durch ein Verdichten des Betons zu beseitigen. Zu diesem Zweck werden Vibrationen in Form von hochfrequenten Schwingungen durch Rüttelgeräte in die Frischbetonschüttungen eingeleitet. Die dafür auf Baustellen am häufigsten eingesetzten Rüttelgeräte sind die sogenannten Innenrüttler bzw. Innenvibratoren.When processing fresh concrete fillings, it is essential to achieve sufficient concrete strength and tightness to eliminate structural disturbances and air pockets that occur when pouring the concrete by compacting the concrete. For this purpose, vibrations in the form of high-frequency vibrations are introduced into the fresh concrete beds by vibrators. The most frequently used vibrators on construction sites are the so-called internal vibrators or internal vibrators.
Neben dem Einleiten einer bestimmten Energie kommt der Form und der Frequenz der eingebrachten Schwingungen eine zentrale Bedeutung für ein wirkungsvolles Verdichten des Betons zu. In den meisten Anwendungsfällen hat sich dabei beim Einsatz von Innenvibratoren eine Betriebsfrequenz von 200 Hz als optimal herausgestellt. Zur Bereitstellung solch hochfrequenter Schwingungen haben sich auf dem Markt in breitem Maße Innenvibratoren durchgesetzt, bei denen ein Hochfrequenz-Elektromotor in einem als Rüttlergehäuse dienenden Flaschenkörper eingebaut ist. Diese Geräte werden über getrennte mechanische oder elektronische Frequenz- und Spannungsumformer betrieben. Durch die von den Innenvibratoren getrennt vorgesehenen Umformer, die aufgrund ihres Gewichts und ihrer Größe nur eingeschränkt tragbar sind, ist jedoch der mögliche Einsatzradius derartiger Innenvibratoren auf der Baustelle erheblich eingeschränkt.In addition to introducing a certain amount of energy, the shape and frequency of the vibrations are of central importance for the effective compaction of the concrete. In most applications, an operating frequency of 200 Hz has been found to be optimal when using internal vibrators. Internal vibrators, in which a high-frequency electric motor is installed in a bottle body serving as a vibrator housing, have become widely accepted on the market for providing such high-frequency vibrations. These devices are operated via separate mechanical or electronic frequency and voltage converters. However, due to the transducers provided separately from the internal vibrators, which due to their weight and size can only be carried to a limited extent, the possible range of use of such internal vibrators on the construction site is considerably restricted.
Aus der DE 92 17 854 U ist ein Innenrüttler zum Verdichten von Beton bekannt, der mit einem Hochfrequenz-Elektromotor betrieben wird. Ein Frequenzumformer ist dabei mit einem Betätigungsschalter des Elektromotors zu einer miniaturisierten Baueinheit zusammengefaßt und in einem Schaltergehäuse untergebracht. Dadurch kann gegenüber herkömmlichen Hochfrequenz-Innenvibratoren auf zusätzliche Frequenzumformer verzichtet werden, wodurch die Handhabung dieses Innenrüttlers für eine Bedienungsperson wesentlich vereinfacht ist. Ferner ist dabei der Einsatzradius des Innenrüttlers infolge von verringerten Abmessungen des Schaltergehäuses und einer damit verbundenen Gewichtsabnahme verbessert. Allerdings kann das Schaltergehäuse in seinen Abmessungen nicht vollständig an immer klei- ner bauende elektronische Frequenzumformer angepasst werden, weil eine ausreichend große Abfuhr von Wärme, die beim Betrieb des Frequenzumformers erzeugt wird, über die Oberfläche des Schaltergehäuses mittels Konvektion sicherzustellen ist. Eine weitere Verkleinerung des Schaltergehäuses hätte nachteilig zur Folge, dass keine ausreichende Wärmeabfuhr an die Umgebung gewährleistet ist und der Frequenzumformer somit als Folge einer thermischen Überbelastung ausfallen kann.From DE 92 17 854 U an internal vibrator for compacting concrete is known, which is operated with a high-frequency electric motor. A frequency converter is combined with an actuating switch of the electric motor to form a miniaturized unit and housed in a switch housing. As a result, additional frequency converters can be dispensed with in comparison to conventional high-frequency internal vibrators, as a result of which the handling of this internal vibrator is considerably simplified for an operator. Furthermore, the radius of use of the internal vibrator is improved as a result of the reduced dimensions of the switch housing and the associated decrease in weight. However, the dimensions of the switch housing cannot always be completely small. ner building electronic frequency converter can be adapted because a sufficiently large dissipation of heat, which is generated during operation of the frequency converter, must be ensured by means of convection over the surface of the switch housing. A further downsizing of the switch housing would have the disadvantage that insufficient heat dissipation to the surroundings is guaranteed and the frequency converter can therefore fail as a result of thermal overload.
Der Erfindung liegt die Aufgabe zugrunde, einen elektronischen Frequenzumformer anzugeben, der thermisch stabil betreibbar und somit im Praxisbetrieb störungsfrei einsetzbar ist.The invention is based on the object of specifying an electronic frequency converter which can be operated in a thermally stable manner and thus can be used without interference in practical operation.
Erfindungsgemäß wird die Aufgabe durch einen elektronischen Frequenzumformer mit den Merkmalen von Patentanspruch 1 gelöst. Vorteilhafte Weiterbildungen der Erfindung sind in den abhängigen Patentansprüchen definiert.According to the invention the object is achieved by an electronic frequency converter with the features of claim 1. Advantageous developments of the invention are defined in the dependent claims.
Ein erfindungsgemäjδer elektronischer Frequenzumformer für einen Hochfrequenz- Innenvibrator zum Verdichten von Beton, wobei zumindest ein Teil der Komponenten des Frequenzumformers in einem Umformergehäuse angeordnet ist, ist gekenn- zeichnet durch einen Kühlkreislauf mit einem darin enthaltenen Kühlmedium, einen in den Kühlkreislauf integrierten ersten Wärmetauscher zum Übertragen von in dem Umformergehäuse erzeugter Wärme an das Kühlmedium und durch einen in den Kühlkreislauf integrierten zweiten Wärmetauscher zum Übertragen von durch das Kühlmedium aufgenommener Wärme nach außen.An electronic frequency converter according to the invention for a high-frequency internal vibrator for compacting concrete, at least some of the components of the frequency converter being arranged in a converter housing, is characterized by a cooling circuit with a cooling medium contained therein, and a first heat exchanger integrated into the cooling circuit for transmission heat generated in the converter housing to the cooling medium and by a second heat exchanger integrated in the cooling circuit for transferring heat absorbed by the cooling medium to the outside.
Der Kühlkreislauf und die darin integrierten ersten und zweiten Wärmetauscher bewirken eine sehr gute Kühlung des Frequenzumformers durch eine effiziente Abiuhr von Wärme aus dem Umformergehäuse nach außen, so dass der Frequenzumformer vor einem Ausfall infolge eines Wärmestaus in dem Umformergehäuse ge- schützt ist. Eine herkömmliche Wärmeabfuhr über Konvektion wird durch eine Wärmeübertragung an das Kühlmedium und eine anschließende Wärmeabfuhr nach außen überlagert, so dass gegenüber bekannten Frequenzumformern ohne Kühlkreislauf eine Verkleinerung einer Oberfläche des Umformergehäuses ohne eine Beeinträchtigung der Betriebssicherheit des Frequenzumformers möglich ist. Somit lässt sich eine weitere Verkleinerung des Umformergehäuses und damit verbunden eine verbesserte Handhabbarkeit des Frequenzumformers beim Einsatz in der Praxis erzielen. Bei einer möglichen Ausführuπgsform der Erfindung ist der erste Wärmetauscher an oder auf dem Umformergehäuse angeordnet. Der erste Wärmetauscher ist dabei wärmeerzeugenden Komponenten des Frequenzumformers, die in dem Umformergehäuse untergebracht sind, so zugeordnet, dass von diesen Komponenten erzeugte Wärme durch den ersten Wärmetauscher an das Kühlmedium übertragen werden kann. In gleicher Weise können Rohre, durch die z. B. ein Teil des Kühlkreislaufs ausgebildet ist, an einer Außenfläche des Umformergehäuses angeordnet sein. Ferner ist der zweite Wärmetauscher getrennt von dem Umformergehäuse vorgesehen, um von durch das Kühlmedium aufgenommene Wärme nach außen zu übertragen.The cooling circuit and the first and second heat exchangers integrated therein bring about very good cooling of the frequency converter by efficiently dissipating heat from the converter housing to the outside, so that the frequency converter is protected against failure due to heat build-up in the converter housing. Conventional heat dissipation via convection is superimposed by heat transfer to the cooling medium and a subsequent heat dissipation to the outside, so that, compared to known frequency converters without a cooling circuit, it is possible to reduce the size of a surface of the converter housing without impairing the operational reliability of the frequency converter. A further downsizing of the converter housing and, associated therewith, improved handling of the frequency converter when used in practice can thus be achieved. In a possible embodiment of the invention, the first heat exchanger is arranged on or on the converter housing. The first heat exchanger is assigned to heat-generating components of the frequency converter, which are accommodated in the converter housing, in such a way that heat generated by these components can be transferred to the cooling medium through the first heat exchanger. In the same way pipes through which z. B. a part of the cooling circuit is formed on an outer surface of the converter housing. Furthermore, the second heat exchanger is provided separately from the converter housing in order to transmit heat absorbed by the cooling medium to the outside.
Eine besonders vorteilhafte Ausführungsform der Erfindung ist dadurch gekennzeichnet, dass der vorstehend genannte Teil des Kühlkreislaufs, der z. B. in Form von Rohren ausgeführt sein kann, innerhalb des Umformergehäuses ausgebildet ist. Somit ist dieser Teil des Kühlkreislaufs vor äußeren Einwirkungen sehr gut ab- geschirmt, die zum Beispiel in Form von Stößen auftreten können. Um den ersten Wärmetauscher in gleicher Weise vor Schädigungen zu schützen, kann dieser ebenfalls in dem Umformergehäuse aufgenommen sein. Dabei ist es möglich, den ersten Wärmetauscher entweder in der Nähe der wärmeerzeugenden Komponenten anzuordnen, oder alternativ direkt an diesen wärmeerzeugenden Komponenten zu befe- stigen. Insgesamt läjSt sich der elektronische Frequenzumformer durch die Integration des ersten Wärmetauschers und eines Teils des Kühlkreislaufs innerhalb des Umformergehäuses sehr robust ausführen.A particularly advantageous embodiment of the invention is characterized in that the aforementioned part of the cooling circuit, the z. B. can be carried out in the form of pipes, is formed within the converter housing. This part of the cooling circuit is therefore very well shielded from external influences, which can occur, for example, in the form of impacts. In order to protect the first heat exchanger from damage in the same way, it can also be accommodated in the converter housing. It is possible to either arrange the first heat exchanger in the vicinity of the heat-generating components, or alternatively to attach it directly to these heat-generating components. Overall, the electronic frequency converter can be made very robust by integrating the first heat exchanger and part of the cooling circuit within the converter housing.
Das zusammen mit dem Kühlkreislauf verwendete Kühlmedium kann aus einer Kühlflüssigkeit oder alternativ aus einem Kühlgas bestehen. Bei einer besonders vorteilhaften Ausführung wird das Kühlmedium in dem Kühlkreislauf von einer Pumpe umgewälzt, wobei ein Durchsatz der Pumpe entsprechend an die Dimensionierung des ersten und zweiten Wärmetauschers angepaßt ist. Hinsichtlich einer einfachen Handhabbarkeit des Frequenzumformers ist es vorteilhaft, dass das Um- formergehäuse mit der Pumpe zu einer Baueinheit zusammengefasst ist. Es ist dabei insbesondere vorteilhaft, dass die Pumpe in das Umformergehäuse integriert ist, um vor äußeren Einwirkungen geschützt zu sein.The cooling medium used together with the cooling circuit can consist of a cooling liquid or alternatively a cooling gas. In a particularly advantageous embodiment, the cooling medium is circulated in the cooling circuit by a pump, a throughput of the pump being adapted accordingly to the dimensions of the first and second heat exchangers. With regard to simple handling of the frequency converter, it is advantageous that the converter housing is combined with the pump to form a structural unit. It is particularly advantageous that the pump is integrated in the converter housing in order to be protected from external influences.
Eine vorteilhafte Weiterentwicklung der Erfindung ist dadurch gekennzeichnet, dass in das Umformergehäuse ein Handschalter zum Betätigen des elektronischen Frequenzumformers integriert ist. Mit einem solchen Handschalter läßt sich der Frequenzumformer in einfacher Weise direkt an dem Umformergehäuse einschalten bzw. ausschalten. In Hinsicht auf einen problemlosen Einsatz auf einer Baustelle ist es weiterhin besonders vorteilhaft, wenn der elektronische Frequenzumformer mit Netzwechselstrom betreibbar ist. In diesem Fall läßt sich der Frequenzumformer über einen normalen Stecker direkt an das Lichtstromnetz mit beispielsweise 230 V und 50 Hz anschließen.An advantageous further development of the invention is characterized in that a hand switch for actuating the electronic frequency converter is integrated in the converter housing. With such a hand switch, the frequency converter can be switched on or off directly on the converter housing in a simple manner. With regard to problem-free use on a construction site, it is also particularly advantageous if the electronic frequency converter can be operated with alternating current. In this case, the frequency converter can be connected directly to the luminous flux network with, for example, 230 V and 50 Hz via a normal plug.
Eine besonders vorteilhafte Ausführungsform der Erfindung sieht einen Hochfre- quenz-Innenvibrator zum Verdichten von Beton vor, der ein Rüttlergehäuse, in dem eine Unwuchtmasse und ein mit höherer als Netzfrequenz arbeitender Elektromotor zum Antrieb der Unwuchtmasse angeordnet sind, einen in einem Umformergehäuse untergebrachten Frequenzumformer zum Speisen des Elektromotors und einen das Rüttlergehäuse und das Umformergehäuse verbindenden Schutzschlauch aufweist und dadurch gekennzeichnet ist, dass der Frequenzumformer ein erfindungsgemäßer elektronischer Frequenzumformer ist. Die vorstehend genannten Vorteile hinsichtlich der Handhabbarkeit des erfindungsgemäßen Frequenzumformers erleichtern somit in gleicher Weise den praktischen Einsatz des Hochfrequenz-Innen- vibrators.A particularly advantageous embodiment of the invention provides a high-frequency internal vibrator for compacting concrete, which has a vibrator housing, in which an unbalanced mass and an electric motor operating at a higher frequency than the mains for driving the unbalanced mass, a frequency converter accommodated in a converter housing for feeding of the electric motor and a protective tube connecting the vibrator housing and the converter housing and is characterized in that the frequency converter is an electronic frequency converter according to the invention. The advantages mentioned above with regard to the manageability of the frequency converter according to the invention thus facilitate in the same way the practical use of the high-frequency internal vibrator.
Besonders vorteilhaft ist es, dass ein weiterer Teil des Kühlkreislaufs des Frequen- zu formers in dem Schutzschlauch und in dem Rüttlergehäuse ausgebildet ist, wobei der zweite Wärmetauscher innerhalb des Rüttlergehäuses angeordnet ist. Das von der Pumpe umgewälzte Kühlmedium durchströmt den zweiten Wärmetauscher, wodurch die durch das Kühlmedium aufgenommene Wärme an das Rüttlergehäuse übertragen wird. Für den Fall, dass das Rüttlergehäuse in den zu verdich- tenden Beton eingetaucht ist, ist es somit vorteilhaft möglich, die an das Rüttlergehäuse übertragene Wärme anschließend an den gut kühlenden Beton abzuleiten.It is particularly advantageous that a further part of the cooling circuit of the frequency converter is formed in the protective hose and in the vibrator housing, the second heat exchanger being arranged within the vibrator housing. The cooling medium circulated by the pump flows through the second heat exchanger, as a result of which the heat absorbed by the cooling medium is transferred to the vibrator housing. In the event that the vibrator housing is immersed in the concrete to be compacted, it is thus advantageously possible to subsequently dissipate the heat transferred to the vibrator housing to the well cooling concrete.
Eine weitere besonders vorteilhafte Ausführungsform des Hochfrequenz-Innenvi- brators ist durch eine Erfassungseinrichtung, durch die eine Änderung eines dem Elektromotor zugeführten Motorstroms erfaßt werden kann, und durch eine durch die Erfassungseinrichtung ansteuerbare Temperaturschutzschalteinrichtung zum Ein- /Ausschalten der Pumpe gekennzeichnet. Beim Praxiseinsatz des Innenvibra- tors ist das Rüttlergehäuse nicht ununterbrochen in den zu verdichtenden Beton eingetaucht, sondern wird gegebenenfalls kurz aus dem Beton herausgezogen, um an anderer Stelle wieder eingetaucht zu werden. Befindet sich das Rüttlergehäuse im Betrieb nicht innerhalb des Betons, sondern hängt beispielsweise frei in der Luft, entwickeln sich in dem Rüttlergehäuse sofort sehr hohe Temperaturen, wobei dabei der dem Elektromotor zugeführte Motorstrom abnimmt. Aus diesem Grund kann die Pumpe bei einer von der Erfassungeinrichtung erfaßten Abnahme des Motorstroms durch die Temperaturschutzschalteinrichtung ausgeschaltet werden. Die daraus resultierende Unterbrechung des Umwälzens des Kühlmediums verhindert, dass die durch den Elektromotor in dem Rüttlergehäuse erzeugte und in diesem Fall über den zweiten Wärmetauscher an das Kühlmedium übertragene Wärme als Folge der Zirkulation des Kühlmediums zurück zu dem ersten Wärmetauscher transportiert wird, was zu einem nachteiligen zusätzlichen Aufheizen des zu dieser Zeit an sich wenig belasteten Frequenzumformers führen würde.A further particularly advantageous embodiment of the high-frequency internal vibrator is characterized by a detection device, by means of which a change in a motor current supplied to the electric motor can be detected, and by a temperature protection switching device that can be controlled by the detection device, for switching the pump on and off. When the internal vibrator is used in practice, the vibrator housing is not continuously immersed in the concrete to be compacted, but is optionally pulled out of the concrete briefly so that it can be immersed again at another point. If, during operation, the vibrator housing is not inside the concrete, but instead hangs freely in the air, very high temperatures develop immediately in the vibrator housing, whereby the motor current supplied to the electric motor decreases. For this reason, the pump can be switched off by the temperature protection switching device when the motor current is detected by the detection device. The resulting interruption of the circulation of the cooling medium prevents the heat generated by the electric motor in the vibrator housing and in this case transferred to the cooling medium via the second heat exchanger as a result of the circulation of the cooling medium being transported back to the first heat exchanger, which is disadvantageous additional heating of the frequency converter, which at that time was not very stressed, would result.
Sobald das Rüttlergehäuse nach einem Herausziehen wieder in den Beton eingetaucht wird, steigt der dem Elektromotor zugeführte Motorstrom an. Entsprechend kann die Pumpe bei einer von der Erfassungseinrichtung erfaßten Zunahme des Motorstroms durch die Temperaturschutzschalteinrichtung eingeschaltet werden, so dass eine vorteilhafte Wärmeübertragung von dem Rüttlergehäuse an den kühlen Beton stattfinden kann.As soon as the vibrator housing is immersed in the concrete after being pulled out, the motor current supplied to the electric motor increases. Accordingly, the pump can be switched on by the temperature protection switching device in the event of an increase in the motor current detected by the detection device, so that an advantageous heat transfer from the vibrator housing to the cool concrete can take place.
Diese und weitere Vorteile und Merkmale der Erfindung werden nachfolgend anhand einer beispielhaften Ausführungsform unter bezug auf die einzige beigefügte Figux erläutert, die einen prinzipiellen Aufbau eines Hochfrequenz-Innenvibrators mit einem erfindungsgemäßen elektronischen Frequenzumformer zeigt.These and further advantages and features of the invention are explained below using an exemplary embodiment with reference to the only attached Figux, which shows a basic structure of a high-frequency internal vibrator with an electronic frequency converter according to the invention.
Der in der Figur dargestellte elektronische Frequenzumformer 1 weist ein Umformergehäuse 2 und einen ersten Wärmetauscher 3 auf, der innerhalb des Umfor- mergehäuses 2 in der Nähe von wärmeerzeugenden Komponenten (nicht gezeigt) des Frequenzumformers 1 angeordnet ist. Der erste Wärmetauscher 3 kann beispielsweise mittels einer Halterung an einer Wand des Umformergehäuses 2 angebracht sein. Alternativ kann der erste Wärmetauscher 3 direkt an den wärmeerzeugenden Komponenten befestigt sein. Durch die Anordnung im Inneren des Umfor- mergehäuses 2 ist der erste Wärmetauscher 3 sehr gut gegen schädigende äußere Einwirkungen geschützt, die beim Einsatz auf einer Baustelle nicht ausgeschlossen sind.The electronic frequency converter 1 shown in the figure has a converter housing 2 and a first heat exchanger 3, which is arranged inside the converter housing 2 in the vicinity of heat-generating components (not shown) of the frequency converter 1. The first heat exchanger 3 can be attached to a wall of the converter housing 2, for example by means of a holder. Alternatively, the first heat exchanger 3 can be attached directly to the heat-generating components. The arrangement in the interior of the converter housing 2 means that the first heat exchanger 3 is very well protected against damaging external influences, which cannot be excluded when used on a construction site.
Der erfindungsgemäße Frequenzumformer 1 weist femer einen Kühlkreislauf 4 auf, in den der erste Wärmetauscher 3 integriert ist. In dem Kühlkreislauf 4 ist einThe frequency converter 1 according to the invention also has a cooling circuit 4, in which the first heat exchanger 3 is integrated. In the cooling circuit 4 is a
Kühlmedium (nicht gezeigt) enthalten, das eine Kühlflüssigkeit oder ein Kühlgas ist. Über den ersten Wärmetauscher 3 wird von den wärmeerzeugenden Komponen- ten des Frequenzumformers 1 erzeugte Wärme an das Kühlmedium übertragen. Der Frequenzumformer 1 weist ferner eine Pumpe 5 auf, die mit dem Umformergehäuse 2 zu einer Baueinheit zusammengefasst ist. Dabei ist die Pumpe 5 in gleicher Weise wie der erste Wärmetauscher 3 zum Schutz vor äußeren Beschädigun- gen in das Umformergehäuse 2 aufgenommen.Contain cooling medium (not shown), which is a cooling liquid or a cooling gas. Via the first heat exchanger 3, the heat-generating components th of the frequency converter 1 generated heat transferred to the cooling medium. The frequency converter 1 also has a pump 5, which is combined with the converter housing 2 to form a structural unit. The pump 5 is accommodated in the converter housing 2 in the same way as the first heat exchanger 3 for protection against external damage.
Der vorstehend genannte Kühlkreislauf 4 ist durch ein Rohr- oder Schlauchsystem ausgebildet, wobei ein Teil des Kühlkreislaufs 4 innerhalb des Umformergehäuses 2 verläuft. Die Rohre, die im allgemeinen empfindlich gegen Stöße sind, sind dadurch wirkungsvoll gegen Beschädigungen geschützt. Die Pumpe 5 ist mit dem Kühlkreislauf 4 derart verbunden, dass das Kühlmedium in dem Kühlkreislauf 4 von ihr umgewälzt werden kann.The above-mentioned cooling circuit 4 is formed by a pipe or hose system, a part of the cooling circuit 4 running inside the converter housing 2. The pipes, which are generally sensitive to impacts, are effectively protected against damage. The pump 5 is connected to the cooling circuit 4 in such a way that the cooling medium can be circulated by it in the cooling circuit 4.
Wie in der Figur ferner gezeigt, ist der Frequenzumformer 1 Bestandteil eines Hoch- frequenz-Innenvibrators, der außerdem ein Rüttlergehäuse 6 und einen Schutzschlauch 7 aufweist.As further shown in the figure, the frequency converter 1 is part of a high-frequency internal vibrator, which also has a vibrator housing 6 and a protective tube 7.
Im Inneren des Rüttlergehäuses 6 sind eine Unwuchtmasse und ein Elektromotor (nicht gezeigt) zum Antrieb der Unwuchtmasse in bekannter Weise angeordnet. Um die zur Betonverdichtung erforderlichen hochfrequenten Schwingungen gewährleisten zu können, wird der Elektromotor von dem Frequenzumformer 1 mit einer Spannung versorgt, deren Frequenz vorzugsweise im Bereich von 200 Hz und somit über der üblichen Netzfrequenz von 50 Hz liegt. Ein Ende des Schutzschlauchs 7 ist mit dem Rüttlergehäuse 6 verbunden, während ein anderes Ende des Schutz- schlauchs 7 über eine Kupplungseinrichtung 8 an dem Umformergehäuse 2 angebracht ist. Der Schutzschlauch 7 ist hinsichtlich einer problemlosen Handhabbarkeit flexibel ausgeführt, wobei sein Außendurchmesser derart bemessen ist, dass er von einer Bedienungsperson einfach ergriffen werden kann, so dass er auch als Bedienungsschlauch dienen kann. Um eventuell notwendige Reparaturen und War- tungsarbeiten leicht durchführen zu können, ist der Schutzschlauch 7 bei einer Variante des erfindungsgemäßen Frequenzumformers 1 von dem Rüttelgehäuse 6 bzw. über die Kupplungseinrichtung 8 von dem Umformergehäuse 2 in einfacher Weise abnehmbar.Inside the vibrator housing 6, an unbalanced mass and an electric motor (not shown) for driving the unbalanced mass are arranged in a known manner. In order to be able to guarantee the high-frequency vibrations required for concrete compaction, the electric motor is supplied with a voltage by the frequency converter 1, the frequency of which is preferably in the range of 200 Hz and thus above the usual mains frequency of 50 Hz. One end of the protective hose 7 is connected to the vibrator housing 6, while another end of the protective hose 7 is attached to the converter housing 2 via a coupling device 8. The protective tube 7 is flexible in terms of ease of handling, and its outer diameter is dimensioned such that it can be easily gripped by an operator, so that it can also serve as an operating tube. In order to be able to easily carry out any necessary repairs and maintenance work, the protective tube 7 in a variant of the frequency converter 1 according to the invention can be removed in a simple manner from the vibrating housing 6 or via the coupling device 8 from the converter housing 2.
An einer Seite des Umformergehäuses 2 ist ein Stromzuführungskabel 9 mit einem Stecker 10 herausgeführt. Der elektronische Frequenzumformer 1 kann über das Stromzuführungskabel 9 und den Stecker 10 mit üblichem Netzwechselstrom be- trieben werden, wobei er die normale Wechselstromfrequenz von 50 Hz auf Werte von bis zu 200 Hz heraufsetzt. In dem Schutzschlauch 7 sind elektrische Leitungen (nicht gezeigt) aufgenommen, die einen Ausgang des Frequenzumformers 1 mit dem in dem Rüttiergehäuse 6 angeordneten Elektromotor verbinden. Dadurch kann der Elektromotor mit einer von dem Frequenzumformer 1 ausgegegebenen hochfrequenten Spannung gespeist werden.A power supply cable 9 with a plug 10 is led out on one side of the converter housing 2. The electronic frequency converter 1 can be supplied with conventional mains alternating current via the power supply cable 9 and the plug 10. driven, increasing the normal AC frequency from 50 Hz to values of up to 200 Hz. In the protective tube 7, electrical lines (not shown) are received, which connect an output of the frequency converter 1 to the electric motor arranged in the vibrating housing 6. As a result, the electric motor can be supplied with a high-frequency voltage output by the frequency converter 1.
Der Frequenzumformer 1 weist ferner einen in den Kühlkreislauf 4 integrierten zweiten Wärmetauscher 11 auf, der innerhalb des Rüttlergehäuses 6 angeordnet ist. Ein Teil des Kühlkreislaufs 4 verläuft innerhalb des Schutzschlauchs 7 und führt von dem Umformergehäuse 2 zu dem zweiten Wärmetauscher 11.The frequency converter 1 also has a second heat exchanger 11 integrated in the cooling circuit 4, which is arranged inside the vibrator housing 6. A part of the cooling circuit 4 runs inside the protective tube 7 and leads from the converter housing 2 to the second heat exchanger 11.
Durch den Betrieb der Pumpe 5 ist gewährleistet, dass das in dem Kühlkreislauf 4 enthaltene Kühlmedium von dem ersten Wärmetauscher 3 durch den Schutz- schlauch 7 hindurch zu dem zweiten Wärmetauscher 11 gelangt. Die durch den ersten Wärmetauscher 3 auf das Kühlmedium übertragene Wärme wird nun über den zweiten Wärmetauscher 11 an das Rüttlergehäuse 6 abgegeben. Danach zirkuliert das Kühlmedium durch den Schutzschlauch 7 zurück in Richtung des ersten Wärmetauschers 3.The operation of the pump 5 ensures that the cooling medium contained in the cooling circuit 4 passes from the first heat exchanger 3 through the protective hose 7 to the second heat exchanger 11. The heat transferred to the cooling medium by the first heat exchanger 3 is now released to the vibrator housing 6 via the second heat exchanger 11. The cooling medium then circulates back through the protective tube 7 in the direction of the first heat exchanger 3.
Wie in der Figur weiterhin schematisch dargestellt, wird das Rüttlergehäuse 6 im Betrieb in den zu verarbeitenden, noch frischen Beton 12 eingetaucht. Da der Beton im allgemeinen eine im Verhältnis zu dem Frequenzumformer 1 relativ geringe Temperatur aufweist, kann die von dem zweiten Wärmetauscher 11 an das Rüttler- gehäuse 6 übertragene Wärme anschließend effizient an den kühlenden Beton 12 abgeleitet werden.As shown schematically in the figure, the vibrator housing 6 is immersed in the still fresh concrete 12 to be processed during operation. Since the concrete generally has a relatively low temperature in relation to the frequency converter 1, the heat transferred from the second heat exchanger 11 to the vibrator housing 6 can then be efficiently conducted away to the cooling concrete 12.
Der vorstehend erläuterte erfindungsgemäße Frequenzumformer 1 kann mit großer Sicherheit in einem thermisch unkritischen Zustand über eine lange Zeitdauer be- trieben werden.The frequency converter 1 according to the invention explained above can be operated with great certainty in a thermally non-critical state over a long period of time.
Durch die Kühlung des Frequenzumformers 1 lassen sich die Außenabmessungen des Umformergehäuses 2 weiter verkleinern, ohne dass es infolge einer zu geringen Konvektionskühlung des Umformergehäuses 2 zu einer Störung bzw. einem Ausfall des Frequenzumformers 1 kommt. By cooling the frequency converter 1, the external dimensions of the converter housing 2 can be further reduced without the frequency converter 1 malfunctioning or failing as a result of insufficient convection cooling of the converter housing 2.

Claims

P a t e n t a n s p r ü c h e Patent claims
1. Elektronischer Frequenzumformer (1) für einen Hochfrequenz-Innenvibrator zum Verdichten von Beton (11), wobei zumindest ein Teil der Komponenten des Frequenzumformers (1) in einem Umformergehäuse (2) angeordnet ist, gekennzeichnet durch einen Kühlkreislauf (4) mit einem darin enthaltenen Kühlmedium; einen in den Kühlkreislauf (4) integrierten ersten Wärmetauscher (3) zum Übertragen von in dem Umformergehäuse (2) erzeugter Wärme an das Kühlmedi- um; und durch einen in den Kühlkreislauf (4) integrierten zweiten Wärmetauscher (11) zum Übertragen von durch das Kuhlmedium aufgenommener Wärme nach außen.1. Electronic frequency converter (1) for a high-frequency internal vibrator for compacting concrete (11), at least some of the components of the frequency converter (1) being arranged in a converter housing (2), characterized by a cooling circuit (4) with one therein contained cooling medium; a first heat exchanger (3) integrated in the cooling circuit (4) for transferring heat generated in the converter housing (2) to the cooling medium; and by a second heat exchanger (11) integrated in the cooling circuit (4) for transferring heat absorbed by the cooling medium to the outside.
2. Elektronischer Frequenzumformer (1) nach Anspruch 1, dadurch gekenn- zeichnet, dass ein Teil des Kühlkreislaufs (4) innerhalb des Umformergehäuses (2) ausgebildet ist.2. Electronic frequency converter (1) according to claim 1, characterized in that part of the cooling circuit (4) is formed within the converter housing (2).
3. Elektronischer Frequenzumformer (1) nach Anspruch 1 oder 2, dadurch gekennzeichnet, dass der erste Wärmetauscher (3) in dem Umformergehäuse (2) an- geordnet ist.3. Electronic frequency converter (1) according to claim 1 or 2, characterized in that the first heat exchanger (3) is arranged in the converter housing (2).
4. Elektronischer Frequenzurnformer (1) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass das Kühlmedium in dem Kühlkreislauf (4) von einer Pumpe (5) umwälzbar ist.4. Electronic frequency converter (1) according to one of the preceding claims, characterized in that the cooling medium in the cooling circuit (4) can be circulated by a pump (5).
5. Elektronischer Frequenzumformer (1) nach Anspruch 4, dadurch gekennzeichnet, dass das Umformergehäuse (2) mit der Pumpe (5) zu einer Baueinheit zusammengefasst ist.5. Electronic frequency converter (1) according to claim 4, characterized in that the converter housing (2) with the pump (5) is combined to form a structural unit.
6. Elektronischer Frequenzumformer (1) nach einem der Ansprüche 4 oder 5, dadurch gekennzeichnet, dass die Pumpe (5) in das Umformergehäuse (2) integriert ist.6. Electronic frequency converter (1) according to one of claims 4 or 5, characterized in that the pump (5) is integrated in the converter housing (2).
7. Elektronischer Frequenzumformer (1) nach einem der vorstehenden Ansprü- ehe, dadurch gekennzeichnet, dass in das Umformergehäuse (2) ein Handschalter zum Ein- /Ausschalten des elektronischen Frequenzumformers (1) integriert ist. 7. Electronic frequency converter (1) according to one of the preceding claims, characterized in that a manual switch for switching on / off the electronic frequency converter (1) is integrated in the converter housing (2).
8. Elektronischer Frequenzumformer (1) nach einem der vorstehenden Ansprüche, dadurch gekennzeichnet, dass er mit Netzwechselstrom betreibbar ist.8. Electronic frequency converter (1) according to one of the preceding claims, characterized in that it can be operated with mains alternating current.
9. Hochfrequenz-Innenvibrator zum Verdichten von Beton (11), mit: - einem Rüttlergehäuse (6), in dem eine Unwuchtmasse und ein mit höherer als Netzfrequenz arbeitender Elektromotor zum Antrieb der Unwuchtmasse angeordnet sind; einem in einem Umformergehäuse (2) untergebrachten Frequenzumformer zum Speisen des Elektromotors; und - einem das Rüttlergehäuse (6) und das Umformergehäuse (2) verbindenden9. High-frequency internal vibrator for compacting concrete (11), comprising: - a vibrator housing (6) in which an unbalanced mass and an electric motor operating at a higher frequency than the mains frequency are arranged to drive the unbalanced mass; a frequency converter housed in a converter housing (2) for feeding the electric motor; and one connecting the vibrator housing (6) and the converter housing (2)
Schutzschlauch (7), dadurch gekennzeichnet, dass der Frequenzumformer ein elektronischer Frequenzumformer (1) nach einem der Ansprüche 1 bis 8 ist.Protective tube (7), characterized in that the frequency converter is an electronic frequency converter (1) according to one of claims 1 to 8.
10. Hochfrequenz-Innenvibrator nach Anspruch 9, dadurch gekennzeichnet, dass ein weiterer Teil des Kühlkreislaufs in dem Schutzschlauch (7) und in dem Rüttlergehäuse (6) ausgebildet ist, und dass der zweite Wärmetauscher (11) in dem Rüttlergehäuse (6) angeordnet ist, um durch das Kühlmedium aufgenommene Wärme an das Rüttlergehäuse (6) zu übertragen.10. High-frequency internal vibrator according to claim 9, characterized in that a further part of the cooling circuit is formed in the protective hose (7) and in the vibrator housing (6), and in that the second heat exchanger (11) is arranged in the vibrator housing (6) to transfer heat absorbed by the cooling medium to the vibrator housing (6).
11. Hochfrequenz-Innenvibrator nach Anspruch 9 oder 10, mit einem elektronischen Frequenzumformer (1) nach einem der Ansprüche 4 bis 8, gekennzeichnet durch - eine Erfassungseinrichtung, durch die eine Änderung eines dem Elektromotor zugeführten Motorstroms erfassbar ist; und durch eine durch die Erfassungseinrichtung ansteuerbare Temperaturschutz- schalteinrichtung zum Ein- /Ausschalten der Pumpe (5); wobei die Pumpe (5) bei einer von der Erfassungseinrichtung erfassten Abnahme des Motorstroms durch die Temperaturschutzschalteinrichtung ausschaltbar ist; und wobei die Pumpe (5) bei einer von der Erfassungseinrichtung erfassten Zunahme des Motorstroms durch die Temperaturschutzschalteinrichtung einschaltbar ist. 11. High-frequency internal vibrator according to claim 9 or 10, with an electronic frequency converter (1) according to one of claims 4 to 8, characterized by - a detection device through which a change in a motor current supplied to the electric motor can be detected; and by a temperature protection switching device which can be controlled by the detection device for switching the pump (5) on and off; wherein the pump (5) can be switched off by the temperature protection switching device when the motor current is detected by the detection device; and the pump (5) can be switched on by the temperature protection switching device when the motor current increases as detected by the detection device.
EP02719689A 2001-01-12 2002-01-11 High frequency vibrator with cooled electronic frequency converter Expired - Lifetime EP1349997B1 (en)

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DE10101277 2001-01-12
DE10101277A DE10101277B4 (en) 2001-01-12 2001-01-12 High-frequency internal vibrator with cooled electronic frequency converter
PCT/EP2002/000224 WO2002057570A1 (en) 2001-01-12 2002-01-11 Electronic frequency converter comprising a cooling circuit

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111002430A (en) * 2019-12-20 2020-04-14 上海舟润实业有限公司 Concrete compaction equipment

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10101277B4 (en) * 2001-01-12 2006-11-02 Wacker Construction Equipment Ag High-frequency internal vibrator with cooled electronic frequency converter
DE10124145C1 (en) * 2001-05-17 2002-08-14 Wacker Werke Kg Internal vibrator for compacting concrete
JP2006183430A (en) * 2004-12-28 2006-07-13 Nippon Oil Corp Concrete vibrator
US20150200566A1 (en) * 2014-01-10 2015-07-16 Zippy Technology Corp. Redundant power supply system for reducing standby power consumption
CN114086245B (en) * 2021-11-23 2022-08-26 山东天岳先进科技股份有限公司 Circulating cooling system and crystal growth furnace

Family Cites Families (28)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1989409A (en) * 1932-05-24 1935-01-29 Viber Company Ltd Method and apparatus for compacting and dewatering cementitious materials
CH578665A5 (en) * 1974-08-26 1976-08-13 Vlk Jaroslav Integral vibrator for compacting freshly cast concrete - has tubular hermetically sealed housing with motor connected to eccentric
DE2525592B2 (en) * 1975-06-09 1977-07-28 INDOOR VIBRATOR FOR COMPACTING CONCRETE OR DGL.
US5202612A (en) * 1988-01-29 1993-04-13 Sinano Electric Co., Ltd. Concrete vibrator
JPH0751839B2 (en) * 1989-02-21 1995-06-05 エクセン株式会社 Portable wall concrete pouring equipment
US5108189A (en) * 1990-09-19 1992-04-28 Fred Oswald Vibrator and related method
DE9215217U1 (en) * 1991-08-14 1993-01-14 Alfred Kärcher GmbH & Co, 7057 Winnenden High pressure cleaning device
DE9217854U1 (en) * 1992-12-30 1993-03-04 Wacker-Werke Gmbh & Co Kg, 8077 Reichertshofen Internal vibrator fed by a converter
US5556199A (en) * 1994-12-14 1996-09-17 Oswald; Fred Vibrator with covering and related method
US5725304A (en) * 1995-12-13 1998-03-10 Makita Corporation Battery concrete vibrator
JPH09291703A (en) * 1996-04-26 1997-11-11 Mikasa Sangyo Kk Concrete vibrator
US6109111A (en) * 1997-02-14 2000-08-29 Racine Federated Inc. Concrete vibrator monitor
JP3296260B2 (en) * 1997-09-01 2002-06-24 三菱電機株式会社 Water cooling equipment for high-voltage electrical equipment
EP0916785A1 (en) * 1997-11-11 1999-05-19 BOMAG GmbH Vibrator for compacting concrete
DE19756250C2 (en) * 1997-12-17 2000-11-02 Siemens Ag Self-commutated converter of a voltage-impressing converter with high-performance modules
DE19815645C1 (en) * 1998-04-07 1999-08-19 Siemens Ag Electronic converter arrangement with cooling system
DE19815655C2 (en) 1998-04-08 2002-04-11 Eckart Doege Drive device for a work machine
CH689598A5 (en) * 1998-06-09 1999-06-30 Msz Motoren Service Ag Zuerich Converter-fed immersion vibrator for use on building site
DE19831282A1 (en) * 1998-07-13 2000-01-20 Abb Daimler Benz Transp Semiconductor cooler system for rectifiers of electric rail cars
WO2000024114A1 (en) * 1998-10-16 2000-04-27 Ilyas Tekin Power transformer design for the electronic converters
DE19900348A1 (en) * 1999-01-07 2000-07-13 Irt Innovative Recycling Techn Compact controller for electric motor poker vibrator has current conversion performed in housing contg. control elements and connections and fitted with cooling surfaces
DE19913305C2 (en) * 1999-03-24 2003-01-02 Wacker Werke Kg Internal vibrator with frequency converter
DE19913450A1 (en) * 1999-03-25 2000-09-28 Mannesmann Sachs Ag Power electronics for controlling electrical power machine performance/power section with capacitors connecting splint rings and screw joints while the lid connects to the housing with connections to the cooling device
DE29912206U1 (en) * 1999-07-13 1999-10-07 Gutgesell, Karsten, 68305 Mannheim Active cooler for microprocessors
DE10033137A1 (en) * 2000-07-07 2002-01-31 Wacker Werke Kg Frequency converter for an internal vibrator
DE10101277B4 (en) * 2001-01-12 2006-11-02 Wacker Construction Equipment Ag High-frequency internal vibrator with cooled electronic frequency converter
US6811297B2 (en) * 2001-02-26 2004-11-02 Fred Oswald Vibrator having a core with soft sheath and apertures therethrough
US20030111753A1 (en) * 2001-12-13 2003-06-19 Oztec Industries Inc. Vibrator and related method

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO02057570A1 *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111002430A (en) * 2019-12-20 2020-04-14 上海舟润实业有限公司 Concrete compaction equipment

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ES2322037T3 (en) 2009-06-16
US20040061457A1 (en) 2004-04-01
JP3940123B2 (en) 2007-07-04
DE50213410D1 (en) 2009-05-14
DE10101277B4 (en) 2006-11-02
WO2002057570A1 (en) 2002-07-25
WO2002057570A8 (en) 2002-09-06
EP1349997B1 (en) 2009-04-01
JP2005520077A (en) 2005-07-07
DE10101277A1 (en) 2002-07-25
US6960013B2 (en) 2005-11-01

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