EP1565905A2 - Procede et dispositif de refroidissement de transducteurs d'ultrasons - Google Patents

Procede et dispositif de refroidissement de transducteurs d'ultrasons

Info

Publication number
EP1565905A2
EP1565905A2 EP03767582A EP03767582A EP1565905A2 EP 1565905 A2 EP1565905 A2 EP 1565905A2 EP 03767582 A EP03767582 A EP 03767582A EP 03767582 A EP03767582 A EP 03767582A EP 1565905 A2 EP1565905 A2 EP 1565905A2
Authority
EP
European Patent Office
Prior art keywords
transducer
coolant
flow
cooling
cooling liquid
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
EP03767582A
Other languages
German (de)
English (en)
Other versions
EP1565905B1 (fr
Inventor
Harald Hielscher
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.)
Dr Hielscher GmbH
Original Assignee
Dr Hielscher GmbH
Dr Hielscher GmbH
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 Dr Hielscher GmbH, Dr Hielscher GmbH filed Critical Dr Hielscher GmbH
Publication of EP1565905A2 publication Critical patent/EP1565905A2/fr
Application granted granted Critical
Publication of EP1565905B1 publication Critical patent/EP1565905B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G—PHYSICS
    • G10—MUSICAL INSTRUMENTS; ACOUSTICS
    • G10K—SOUND-PRODUCING DEVICES; METHODS OR DEVICES FOR PROTECTING AGAINST, OR FOR DAMPING, NOISE OR OTHER ACOUSTIC WAVES IN GENERAL; ACOUSTICS NOT OTHERWISE PROVIDED FOR
    • G10K11/00—Methods or devices for transmitting, conducting or directing sound in general; Methods or devices for protecting against, or for damping, noise or other acoustic waves in general
    • G10K11/004—Mounting transducers, e.g. provided with mechanical moving or orienting device
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B06—GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS IN GENERAL
    • B06B—METHODS OR APPARATUS FOR GENERATING OR TRANSMITTING MECHANICAL VIBRATIONS OF INFRASONIC, SONIC, OR ULTRASONIC FREQUENCY, e.g. FOR PERFORMING MECHANICAL WORK IN GENERAL
    • B06B1/00—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency
    • B06B1/02—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy
    • B06B1/06—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction
    • B06B1/0607—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements
    • B06B1/0611—Methods or apparatus for generating mechanical vibrations of infrasonic, sonic, or ultrasonic frequency making use of electrical energy operating with piezoelectric effect or with electrostriction using multiple elements in a pile

Definitions

  • the invention relates to a method and a device for cooling ultrasonic transducers with the features mentioned in the preambles of claims 1 and 6.
  • EP 0553804 A2 discloses a cooling system for a high-frequency ultrasound transducer, which is based on the principle of heat conduction.
  • a heat sink in the form of a heat sink is located behind the ultrasound transducer.
  • the heat sink is in turn connected to a housing by means of a thermally conductive resin.
  • the heat is first transferred from the converter into the heat sink and from there via the resin into the surrounding housing, where the heat is ultimately released into the surrounding air.
  • This type of cooling is inadequate for high outputs and cannot be used for high amplitudes of several micrometers, because this results in a high energy input into the resin.
  • cooling systems for ultrasonic transducers are based only on heat dissipation through the openings of a housing surrounding the transducer by means of convection (e.g. SONOPULS HD 60, BANDELIN electronic GmbH & Co. KG). This type of cooling is also not sufficient for high outputs.
  • the heat pipe as a channel is wholly or partially molded into the material surrounding the transducer in order to achieve the largest possible contact surface.
  • the coolant does not flow through the transducer, but through a cooling system in contact with the transducer.
  • heat dissipation is insufficient for high performance.
  • WO 0008630 AI an arrangement for heat dissipation, in particular for ultrasonic transducers of high power, is known from WO 0008630 AI.
  • the heat dissipation is based on the combination of heat conduction and convection.
  • the surface of the transducer body is provided with a vibration-absorbing layer, which reduces the mechanical friction losses during heat transfer.
  • a heat sink is arranged on this layer, from which the heat can be removed by means of a coolant by convection.
  • the disadvantage of this arrangement is that the temperature gradients created by the layer transitions reduce the efficiency in heat dissipation.
  • the invention has for its object to provide a method and a device for cooling ultrasonic transducers, which are characterized by a more effective heat dissipation of the heat generated by power losses than previously known and thus reliably and economically ensure the continuous operation of ultrasonic transducers at high power.
  • this object is achieved by a method having the features mentioned in claim 1 and a device having the features mentioned in claim 8.
  • the method according to the invention for cooling ultrasonic transducers is characterized in that a cooling liquid introduced under pressure flows through and / or flows around the body of the ultrasonic transducer.
  • a cooling liquid introduced under pressure flows through and / or flows around the body of the ultrasonic transducer.
  • the heat generated in the transducers is dissipated directly by convection. No heat conduction via cooling elements is required.
  • the heat dissipation achieved is considerably more effective than in the known methods, so that the continuous operation of ultrasonic transducers of high power can be guaranteed with the means according to the invention.
  • the pressure of the cooling liquid is dimensioned such that the cavitation is reduced or avoided.
  • the pressure is preferably set in a range from 2 to 20 bar. 5 bar is particularly preferably provided. This advantageously has the effect that the risk of damage to the device due to cavitation is significantly reduced and that an additional power input through cavitation generation is reduced or avoided.
  • the pressure of the cooling liquid can be generated by the dimensioning of flow channels and / or by gas pressure.
  • the flow through the body of the ultrasound transducer from the inner region to the outer region, the liquid pressure being built up in the inner region and the cooling liquid flowing off via the housing, or from the outer region to the inner region, the pressure being built up in the outer region and the coolant flows out over the interior, is realized.
  • the throughflow takes place in such a way that pressure is built up both inside and outside in order to avoid cavitation, a pressure gradient between the inside and outside being necessary for the flow of the cooling liquid.
  • the body of the ultrasound transducer is flowed around in the interior and / or in the exterior, since this removes heat from the transducer surface by convection.
  • the interior is in particular the cavity between the tension rod and the converter body, the exterior, in particular the space between the converter body and the housing.
  • the cooling liquid is an electrically non-conductive liquid, since this avoids electrical short circuits.
  • the device according to the invention for cooling ultrasonic transducers is characterized in that the device consists of at least one piezo package and at least two cylindrical transducer bodies, which together with the piezo package form a ⁇ / 2 oscillator, with two transducer bodies in each case in the case of multiple arrangements of transducers common transducer bodies can be combined and wherein at least one of the at least two transducer bodies has at least one through-flow channel, through which cooling liquid introduced under pressure can flow.
  • the heat generated in the transducers can be dissipated directly by convection. No heat conduction via cooling elements is required.
  • a large common contact surface between transducers and coolant can be realized with the means according to the invention.
  • the heat dissipation achieved is considerably more effective than in the known methods, so that the continuous operation of ultrasonic transducers of high power can be guaranteed with the means according to the invention.
  • the pressure of the cooling liquid is dimensioned such that the cavitation can be reduced or avoided.
  • the pressure is preferably set in a range from 2 to 20 bar. 5 bar is particularly preferably provided. This is advantageous achieved that the risk of damage to the device by cavitation is significantly reduced and that an additional power input by cavitation generation is reduced or avoided.
  • At least one through-flow channel is slot-shaped, since this enables a large common contact surface between the converter body and the coolant to be achieved. This leads to a higher efficiency in heat dissipation.
  • the device comprises a tension rod arranged in a cavity of the at least two transducer bodies with at least two openings and at least one guide channel through which the cooling liquid introduced under pressure can flow. In this way, a particularly simple to implement and even supply of the coolant into the cavity is achieved.
  • the cooling liquid can be supplied via the at least one guide channel and can be removed via the at least one flow channel. It is also preferably provided that the cooling liquid can be supplied via the at least one flow channel and can be removed via the at least one guide channel in the tensioning rod. In this way, there is a particularly easy-to-use and implementable possibility of flowing through the converter body from the inside to the outside or from the outside to the inside.
  • the device comprises a liquid-tight housing. The housing serves on the one hand to protect the active elements of the converter and furthermore offers a particularly favorable possibility of taking up and guiding the coolant.
  • the device comprises a flange which is connected to the housing and / or a horn and / or a final mass.
  • the flange enables the housing to be fastened in a particularly simple manner.
  • the horn provides a particularly favorable connection possibility with a sonotrode.
  • the device has at least one connection device for a coolant line, through which the coolant can flow into the cavity of the converter body and / or can be removed from the cavity.
  • the device has at least one connection device for a coolant line, through which the coolant can flow into the at least one guide channel and / or can be removed from the at least one guide channel.
  • connection device for a coolant line through which the coolant can flow into the at least one guide channel and / or can be removed from the at least one guide channel.
  • At least one of the at least two transducer bodies can flow around the cooling liquid at least partially on the inner surface and / or at least partially on the outer surface. In this way, effective heat dissipation from the converter bodies is achieved by convection.
  • the converter bodies have no throughflow channels.
  • the converter bodies are only flowed around, the interior being connected to the exterior by a connecting channel.
  • Figure 1 is a schematic sectional view of an ultrasonic transducer with a device for cooling with an axially arranged inlet for coolant
  • Figure 2 is a schematic sectional view of an ultrasonic transducer with a device for cooling with two radially arranged inlets for coolant
  • Figure 3 is a schematic sectional view of an ultrasonic transducer with a device for cooling without flow channels and with a connecting channel.
  • FIG. 1 schematically shows the longitudinal section of an ultrasound transducer with an embodiment of the device according to the invention for cooling the ultrasound transducer.
  • the ultrasound transducer is constructed from cylindrical transducer bodies 5, 6, each with piezo packs 4 arranged on the end face between two transducer bodies 5, 6, some of the transducer bodies 5, 6 being designed as common transducer bodies 6, each having a piezo pack 4 arranged on the end faces thereof.
  • Each piezo pack 4 forms a ⁇ / 2 oscillator with one of the transducer bodies 5 and half of one of the common transducer bodies 6 or with each half of two common transducer bodies 6.
  • the converter bodies 5, 6 have flow channels 7 in the radial direction.
  • Transducer bodies 5, 6 and piezo packs 4 are alternately lined up on a tie rod 3 with end threads.
  • the arrangement is fixed and tensioned with the aid of two threaded end masses 10 which are arranged on opposite ends of the tensioning bar 3 and which are each screwed onto an end thread of the tensioning bar 3.
  • the tie rod 3 has a guide channel 13 for coolant, at one end of which there is a connection device for a coolant line 1, which forms the inlet 1 for the coolant.
  • the tie rod has an outlet opening for the cooling liquid flowing out of the guide channel into the cavity 11 of the converter body.
  • the opposite end mass 10 is connected to a horn 8 which connects the offers the possibility of a sonotrode and is used to transmit the mechanical vibrations generated by the transducer.
  • the device is provided with a liquid-tight housing 12 for receiving the cooling liquid, which is connected to a flange 9, which offers a possibility for mounting in an external system.
  • the flange 9 is connected to the horn 8.
  • the flange 9 has a connection device for a coolant line 2, which forms the outlet 2 for the coolant from the housing 12.
  • the coolant line for the inlet 1 is guided through the housing 12.
  • the coolant is introduced under pressure into the guide channel 13 of the tie rod 3 via the inlet 1.
  • the cooling liquid is fed to the cavity 11 of the converter body via the guide channel 13, where. the coolant flows through the converter bodies in order to ultimately flow through the flow channels 7 of the converter bodies 5, 6. In this way, the heat generated by the transducers is transferred directly to the coolant by convection.
  • the cooling liquid emerging from the flow channels 7 is collected in the housing 12 and discharged from the device via the outlet 2. In this way, a more effective cooling of the ultrasonic transducer is achieved than in the known methods. With the aid of the means according to the invention, the continuous operation of ultrasonic transducers of high power is also guaranteed.
  • Openings for example circular bores, can be provided at the ends of the flow channels 7 in order to increase the service life of the converter bodies and / or to achieve an effective flow through the flow channels 7 designed as slots.
  • the diameter of the bores is advantageously larger than the width of the slots.
  • Figure 2 shows schematically the longitudinal section of the structure of an ultrasonic transducer with a further embodiment of the device according to the invention for cooling the ultrasonic transducer, which corresponds essentially to that shown in Figure 1.
  • there are two inlets 1 for the cooling liquid each of which is arranged radially and is guided from the outside through the housing 12 and the end masses 10 into the cavity 11 between the tension rod 3 and converter body 5, 6.
  • connection devices 1 for connecting the coolant lines to the cavity 11 are thus arranged at the opposite ends of the converter. In this way, the cooling liquid is introduced from the opposite ends under pressure into the cavity 11 and discharged through the flow channels 7. This advantageously results in a more uniform heat dissipation over the entire length of the device than in FIG. 1. An even more effective cooling of the ultrasound transducer is thus achieved than with the exemplary embodiment shown in FIG.
  • FIG. 3 shows a further embodiment variant of the invention, in which the converter bodies 5, 6 have no through-flow channels 7. However, the interior 11 is connected to the exterior 14 via a connecting duct 15.
  • the cooling liquid is supplied via the inlet 1, enters the interior 11 via the guide channel 13, flows around and cools the transducer bodies 5, 6, leaves the interior 11 via the connecting channel 15 and becomes via the exterior 14 and the outlet 2 dissipated.
  • the inside of the converter bodies 5, 6 is cooled.
  • the gas pressure nozzle 6 in the housing is used 12 generates a gas pressure, which in this embodiment is 6 bar.
  • connection device for coolant lines inlet housing inlet Connection device for coolant lines, outlet tie rod piezo package transducer body common transducer body flow channel Hörn flange final mass cavity, interior liquid-tight housing guide channel outer space connecting channel gas pressure connector ring line

Landscapes

  • Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Multimedia (AREA)
  • Mechanical Engineering (AREA)
  • Transducers For Ultrasonic Waves (AREA)
  • Surgical Instruments (AREA)
  • Ultra Sonic Daignosis Equipment (AREA)
  • Measurement Of Velocity Or Position Using Acoustic Or Ultrasonic Waves (AREA)
  • Investigating Or Analyzing Materials By The Use Of Ultrasonic Waves (AREA)
  • Cooling Or The Like Of Electrical Apparatus (AREA)
  • Cooling Or The Like Of Semiconductors Or Solid State Devices (AREA)

Abstract

L'invention concerne un procédé et un dispositif de refroidissement de transducteurs d'ultrasons. Ce dispositif est caractérisé en ce qu'il comprend au moins un élément piézo-électrique (4) et au moins deux corps transducteurs (5) cylindriques qui forment, avec l'élément piézo-électrique (4), un oscillateur lambda /2. Dans le cas d'accouplements de tranducteurs, respectivement deux corps transducteurs (5) peuvent être associés pour former un corps transducteur (6) commun. Les corps transducteurs (5, 6) présentent des canaux d'écoulement (7) dans lesquels circule le liquide de refroidissement sous pression. Le procédé de refroidissement de transducteurs d'ultrasons est caractérisé en ce qu'un liquide de refroidissement sous pression s'écoule à travers le corps du transducteur d'ultrasons et/ou autour de ce dernier. Cela permet l'évacuation avantageuse de la chaleur produite dans les transducteurs directement par convection. En outre, les moyens selon l'invention permettent d'obtenir une grande surface de contact commune entre les transducteurs et le liquide de refroidissement. La dissipation de chaleur obtenue est nettement meilleure que dans les procédés connus, ce qui permet aux moyens selon l'invention de garantir un fonctionnement continu hautement performant de transducteurs d'ultrasons.
EP03767582A 2002-11-20 2003-11-19 Procede et dispositif de refroidissement de transducteurs d'ultrasons Expired - Lifetime EP1565905B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE10254894A DE10254894B3 (de) 2002-11-20 2002-11-20 Vorrichtung zur Kühlung von Ultraschallwandlern
DE10254894 2002-11-20
PCT/EP2003/013003 WO2004047073A2 (fr) 2002-11-20 2003-11-19 Procede et dispositif de refroidissement de transducteurs d'ultrasons

Publications (2)

Publication Number Publication Date
EP1565905A2 true EP1565905A2 (fr) 2005-08-24
EP1565905B1 EP1565905B1 (fr) 2011-10-05

Family

ID=32185938

Family Applications (1)

Application Number Title Priority Date Filing Date
EP03767582A Expired - Lifetime EP1565905B1 (fr) 2002-11-20 2003-11-19 Procede et dispositif de refroidissement de transducteurs d'ultrasons

Country Status (9)

Country Link
US (1) US8004158B2 (fr)
EP (1) EP1565905B1 (fr)
JP (1) JP4739759B2 (fr)
KR (1) KR101248716B1 (fr)
CN (1) CN1739137A (fr)
AT (1) ATE527651T1 (fr)
AU (1) AU2003292052A1 (fr)
DE (1) DE10254894B3 (fr)
WO (1) WO2004047073A2 (fr)

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Also Published As

Publication number Publication date
WO2004047073A3 (fr) 2004-09-10
US20060126884A1 (en) 2006-06-15
US8004158B2 (en) 2011-08-23
KR20050075035A (ko) 2005-07-19
EP1565905B1 (fr) 2011-10-05
WO2004047073A2 (fr) 2004-06-03
AU2003292052A1 (en) 2004-06-15
JP4739759B2 (ja) 2011-08-03
DE10254894B3 (de) 2004-05-27
ATE527651T1 (de) 2011-10-15
JP2006506633A (ja) 2006-02-23
KR101248716B1 (ko) 2013-03-28
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