DE4034611A1 - Two=stage throughflow electric heater - has NTC resistance in second stage avoiding abrupt temp. rise on switching to higher flow rate - Google Patents
Two=stage throughflow electric heater - has NTC resistance in second stage avoiding abrupt temp. rise on switching to higher flow rateInfo
- Publication number
- DE4034611A1 DE4034611A1 DE19904034611 DE4034611A DE4034611A1 DE 4034611 A1 DE4034611 A1 DE 4034611A1 DE 19904034611 DE19904034611 DE 19904034611 DE 4034611 A DE4034611 A DE 4034611A DE 4034611 A1 DE4034611 A1 DE 4034611A1
- Authority
- DE
- Germany
- Prior art keywords
- stage
- heating
- ntc
- water heater
- resistor
- 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.)
- Withdrawn
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24H—FLUID HEATERS, e.g. WATER OR AIR HEATERS, HAVING HEAT-GENERATING MEANS, e.g. HEAT PUMPS, IN GENERAL
- F24H1/00—Water heaters, e.g. boilers, continuous-flow heaters or water-storage heaters
- F24H1/10—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium
- F24H1/12—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium
- F24H1/14—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form
- F24H1/142—Continuous-flow heaters, i.e. heaters in which heat is generated only while the water is flowing, e.g. with direct contact of the water with the heating medium in which the water is kept separate from the heating medium by tubes, e.g. bent in serpentine form using electric energy supply
Landscapes
- Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Resistance Heating (AREA)
- Control Of Resistance Heating (AREA)
Abstract
Description
Die Erfindung betrifft einen elektrischen Durchlauferhitzer mit wenigstens zwei nacheinander einschaltbaren elektrischen Heizstufen.The invention relates to an electrical Instantaneous water heater with at least two in succession switchable electrical heating levels.
In dem DE-GM 19 60 779 ist ein Durchlauferhitzer beschrieben, bei dem als Heizwiderstand Kaltleiter vorgesehen sind. Auch in der älteren Patentanmeldung P 39 23 392.8 ist ein Durchlauferhitzer mit einem PTC- Heizkörper beschrieben. Bei solchen Heizkörpern steigt der ohmsche Widerstand bei einer Erhöhung der Temperatur. Dementsprechend erniedrigt sich die Heizleistung. Diese Erscheinung kann zur Begrenzung von Ubertemperaturen ausgenutzt werden.In DE-GM 19 60 779 is a water heater described, with the PTC thermistor as a heating resistor are provided. Also in the earlier patent application P 39 23 392.8 is a continuous flow heater with a PTC Radiator described. With such radiators increases the ohmic resistance when the temperature increases. Accordingly, the heating power is reduced. These Appearance can limit excess temperatures be exploited.
Untersuchungen mit PTC-Heizkörpern haben jedoch gezeigt, daß die Temperatur des PTC-Heizkörpers im wesentlichen von der aufgenommenen elektrischen Energie bestimmt ist und die Temperatur des Wassers, mit der im Durchlauferhitzer der PTC-Heizkörper in wärmeleitender Verbindung steht, den Widerstand des PTC-Heizkörpers praktisch nicht beeinflußt. Jedenfalls findet eine hinreichend schnelle Anpassung der Temperatur des PTC- Heizkörpers an die Wassertemperatur kaum statt. Dies ist auf die geringe Wärmeleitfähigkeit des PTC-Heizkörpers zurückzuführen.However, studies with PTC radiators have shown that the temperature of the PTC heater is essentially is determined by the electrical energy absorbed and the temperature of the water with which Continuous-flow heater of the PTC radiators in heat-conducting Connection is established, the resistance of the PTC radiator practically not affected. Anyway, one finds Sufficiently quick adjustment of the temperature of the PTC Radiator to the water temperature hardly take place. This is the low thermal conductivity of the PTC radiator attributed.
In der Praxis werden PTC-Widerstände eingesetzt, wenn eine dauerhafte Überhitzung des Heizsystems verhindert werden soll oder große Temperaturdifferenzen mit vergleichsweise kleinen Regelleistungen ausgeglichen werden sollen.In practice, PTC resistors are used when prevents the heating system from overheating permanently should be or large temperature differences with comparatively small balancing powers balanced should be.
Ein weiterer Nachteil von PTC-Heizkörpern besteht in dem hohen Einschaltstrom. Beim Einschalten hat der PTC- Heizkörper Umgebungstemperatur und ist damit wesentlich kälter als bei Betriebstemperatur. Sein Widerstand ist dementsprechend gering, wobei der hohe Einschaltstrom zu einer Heizleistungsspitze und damit Temperaturspitze führt.Another disadvantage of PTC radiators is that high inrush current. When switching on, the PTC- Radiator ambient temperature and is therefore essential colder than at operating temperature. His resistance is accordingly low, with the high inrush current increasing a peak heat output and thus a temperature peak leads.
Aufgabe der Erfindung ist es, einen Durchlauferhitzer der eingangs genannten Art vorzuschlagen, bei dem Temperaturspitzen beim Einschalten der nachrangigen Heizstufe möglichst kleingehalten sind.The object of the invention is to provide a water heater to propose the type mentioned at the beginning, in which Temperature peaks when switching on the subordinate Heating level are kept as small as possible.
Erfindungsgemäß ist obige Aufgabe bei einem Durchlauferhitzer der eingangs genannten Art dadurch gelöst, daß der elektrische Widerstandswert der nachrangig einzuschaltenden Heizstufe eine Heißleiter (NTC)-Charakteristik hat, so daß beim Einschalten dieser Heizstufe zunächst ein Strom fließt, der kleiner ist als der sich danach einstellende Heizstrom.According to the invention, the above task is for one Water heater of the type mentioned in the introduction solved that the electrical resistance value of the a thermistor (NTC) characteristic, so when you turn this Heating level, a current that is less than the heating current that follows.
Dadurch ist erreicht, daß beim Einschalten der nachrangigen Heizstufe deren Heizleistung zunächst reduziert ist, so daß beim Einschalten keine hohen Einschaltstromspitzen und Temperaturspitzen auftreten.This ensures that when the subordinate heating level whose heating output initially is reduced so that no high when switching on Inrush current peaks and temperature peaks occur.
In einer Ausgestaltung der Erfindung besteht die nachrangige Heizstufe aus einem ohmschen Heizwiderstand und einem zu diesem in Reihe geschalteten NTC-Widerstand. Beim Einschalten dieser Heizstufe ist der NTC-Widerstand zunächst noch kalt und weist damit einen hohen Widerstand auf, so daß der Strom durch den Heizwiderstand entsprechend klein ist. Um die Verlustwärme des NTC- Widerstands mit zur Erwärmung des Wassers auszunutzen, kann der NTC-Widerstand mit dem den Durchlauferhitzer durchströmenden Wasser in wärmeleitender Verbindung stehen. Es kann auch vorgesehen sein, den NTC-Widerstand beim Erreichen der Betriebstemperatur des ohmschen Heizwiderstands kurzzuschließen.In one embodiment of the invention subordinate heating level from an ohmic heating resistor and an NTC resistor connected in series with this. When this heating level is switched on, the NTC resistor is initially still cold and thus shows a high resistance on so that the current through the heating resistor is correspondingly small. To the heat loss of the NTC Using resistance to heat the water, the NTC resistor can be used with the instantaneous water heater flowing water in a thermally conductive connection stand. The NTC resistor can also be provided when the operating temperature of the ohmic is reached Short-circuit the heating resistor.
Bei einer anderen Ausführung der Erfindung ist die nachrangige Heizstufe selbst von einem NTC-Widerstand gebildet, der mit dem Wasser in wärmeleitender Verbindung steht. In diesem Fall dient der NTC-Widerstand selbst der Erwärmung des Wassers.In another embodiment of the invention subordinate heating level itself from an NTC resistor formed that with the water in thermally conductive connection stands. In this case, the NTC resistor itself serves Warming the water.
Vorteilhafte Ausgestaltungen der Erfindung ergeben sich aus der folgenden Beschreibung eines Ausführungsbeispiels. In der Zeichnung zeigen:Advantageous refinements of the invention result from the following description of a Embodiment. The drawing shows:
Fig. 1 schematisch einen Durchlauferhitzer, Fig. 1 schematically shows a water heater,
Fig. 2 ein Strom-Zeit-Diagramm und Fig. 2 is a current-time diagram and
Fig. 3 ein Temperatur-Volumenstrom-Diagramm. Fig. 3 is a temperature-volume flow diagram.
Ein Durchlauferhitzer weist als Wasserweg eine Rohrleitung (1) auf. Diese wird in Richtung des Pfeiles W beim Öffnen eines nicht näher dargestellten Zapfventils von Wasser durchströmt.A water heater has a pipe ( 1 ) as the water path. Water flows through this in the direction of arrow W when a nozzle valve (not shown) is opened.
An der Rohrleitung (1) ist über eine elektrisch isolierende, jedoch wärmeleitende Schicht (2) als erste Heizstufe ein ohmscher Heizwiderstand (3) angeordnet, der über einen ersten Schalter (4) einschaltbar ist.An ohmic heating resistor ( 3 ), which can be switched on via a first switch ( 4 ), is arranged on the pipeline ( 1 ) via an electrically insulating but heat-conducting layer ( 2 ) as the first heating stage.
In Richtung W der Wasserströmung folgt dem Heizwiderstand (3) ein NTC-Widerstand (5) als nachrangige Heizstufe. Der NTC-Widerstand (5) ist über eine elektrisch isolierende, jedoch wärmeleitende Isolationsschicht (6) an der Rohrleitung (1) angeordnet. Er ist mittels eines zweiten Schalters (7) einschaltbar. In the W direction of the water flow, the heating resistor ( 3 ) is followed by an NTC resistor ( 5 ) as a subordinate heating stage. The NTC resistor ( 5 ) is arranged on the pipeline ( 1 ) via an electrically insulating but heat-conducting insulation layer ( 6 ). It can be switched on by means of a second switch ( 7 ).
In Fig. 2 zeigt die Kurve (a) den Stromverlauf des NTC-- Widerstands (5) als Funktion der Zeit. Ersichtlich tritt kein den Betriebsstrom überschwingender Einschaltstrom auf. Die Kurve (b) zeigt ein PTC-Verhalten. Dabei tritt ein Einschaltstrom auf, der größer ist als der Betriebsstrom. Ein solches Einschaltverhalten kann auch ein ohmscher Heizwiderstand zeigen.In Fig. 2, curve (a) shows the current profile of the NTC resistor ( 5 ) as a function of time. Obviously there is no inrush current that exceeds the operating current. The curve (b) shows a PTC behavior. An inrush current occurs that is greater than the operating current. An ohmic heating resistor can also show such switch-on behavior.
Die Funktionsweise der beschriebenen Einrichtung wird anhand von Fig. 3 erläutert: Bei einem Mindestvolumenstrom durch die Rohrleitung (1) wird zunächst der Heizwiderstand (3) eingeschaltet. Mit zunehmenden Volumenstrom verläuft dann die Temperatur des Wassers auf dem Ast (c) der Kurve nach Fig. 3.The operation of the described device is explained with reference to FIG. 3: With a minimum volume flow through the pipeline ( 1 ), the heating resistor ( 3 ) is first switched on. The temperature of the water on branch (c) of the curve according to FIG. 3 then runs with increasing volume flow.
Bei einem höheren Volumenstrom, beispielsweise 5 l/min wird auch der Schalter (7) geschlossen, so daß nun auch der NTC-Widerstand (5) eingeschaltet ist. Da dieser zunächst kalt ist, weist er einen hohen Widerstand auf, so daß sich die Temperatur nur langsam erhöht, wie dies der Ast (d) in Fig. 3 zeigt. Es tritt jedenfalls keine Temperaturspitze (e) auf, wie sie sich ergeben würde, wenn auch die nachrangige Schaltstufe nur von einem ohmschen Heizwiderstand gebildet wäre.At a higher volume flow, for example 5 l / min, the switch ( 7 ) is also closed, so that the NTC resistor ( 5 ) is now also switched on. Since this is initially cold, it has a high resistance, so that the temperature increases only slowly, as the branch (d) in FIG. 3 shows. In any case, there is no temperature peak (e) as would result if the subordinate switching stage were only formed by an ohmic heating resistor.
Claims (5)
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19904034611 DE4034611A1 (en) | 1990-10-31 | 1990-10-31 | Two=stage throughflow electric heater - has NTC resistance in second stage avoiding abrupt temp. rise on switching to higher flow rate |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE19904034611 DE4034611A1 (en) | 1990-10-31 | 1990-10-31 | Two=stage throughflow electric heater - has NTC resistance in second stage avoiding abrupt temp. rise on switching to higher flow rate |
Publications (1)
Publication Number | Publication Date |
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DE4034611A1 true DE4034611A1 (en) | 1992-05-07 |
Family
ID=6417369
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
DE19904034611 Withdrawn DE4034611A1 (en) | 1990-10-31 | 1990-10-31 | Two=stage throughflow electric heater - has NTC resistance in second stage avoiding abrupt temp. rise on switching to higher flow rate |
Country Status (1)
Country | Link |
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DE (1) | DE4034611A1 (en) |
Cited By (22)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4233676A1 (en) * | 1992-10-07 | 1994-04-14 | Ego Elektro Blanc & Fischer | Electric radiator for media, especially flow heaters |
EP1138341A3 (en) * | 2000-03-21 | 2003-08-13 | FISHER & PAYKEL LIMITED | Humidification apparatus |
US7111624B2 (en) | 2000-03-21 | 2006-09-26 | Fisher & Paykel Healthcare Limited | Apparatus for delivering humidified gases |
US7120354B2 (en) | 2000-03-21 | 2006-10-10 | Fisher & Paykel Healthcare Limited | Gases delivery conduit |
CN100400980C (en) * | 2005-12-14 | 2008-07-09 | 欧永源 | Anti-electric shock type electric water heater |
US7588029B2 (en) | 2000-03-21 | 2009-09-15 | Fisher & Paykel Healthcare Limited | Humidified gases delivery apparatus |
US7997270B2 (en) | 2001-08-20 | 2011-08-16 | Map Medizin-Technologie Gmbh | Apparatus for supplying respiratory gas and a method for controlling the apparatus |
US8733349B2 (en) | 2009-07-31 | 2014-05-27 | Resmed Limited | Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus |
US20160354573A1 (en) | 2012-11-14 | 2016-12-08 | Matthew Liam Buswell | Zone heating for respiratory circuits |
US9572949B2 (en) | 2013-02-01 | 2017-02-21 | Resmed Limited | Wire heated tube with temperature control system for humidifier for respiratory apparatus |
US9802022B2 (en) | 2008-03-06 | 2017-10-31 | Resmed Limited | Humidification of respiratory gases |
US9855398B2 (en) | 2006-11-08 | 2018-01-02 | Resmed Limited | Humidifier for respiratory apparatus |
US10293121B2 (en) | 2000-10-16 | 2019-05-21 | Fisher & Paykel Healthcare Limited | Apparatus used for the humidification of gases in medical procedures |
US10751498B2 (en) | 2014-03-17 | 2020-08-25 | Fisher & Paykel Healthcare Limited | Medical tubes for respiratory systems |
US10814091B2 (en) | 2013-10-24 | 2020-10-27 | Fisher & Paykel Healthcare Limited | System for delivery of respiratory gases |
US10828482B2 (en) | 2013-12-20 | 2020-11-10 | Fisher & Paykel Healthcare Limited | Humidification system connections |
US10960167B2 (en) | 2015-09-09 | 2021-03-30 | Fisher & Paykel Healthcare Limited | Zone heating for respiratory circuits |
US11007340B2 (en) | 2004-08-20 | 2021-05-18 | Fisher & Paykel Healthcare Limited | Apparatus for measuring properties of gases supplied to a patient |
US11013875B2 (en) | 2005-08-15 | 2021-05-25 | ResMed Pty Ltd | Low cost CPAP flow generator and humidifier assembly |
US11058844B2 (en) | 2012-12-04 | 2021-07-13 | Fisher & Paykel Healthcare Limited | Medical tubes and methods of manufacture |
US11311695B2 (en) | 2016-12-22 | 2022-04-26 | Fisher & Paykel Healthcare Limited | Medical tubes and methods of manufacture |
US11318270B2 (en) | 2011-06-03 | 2022-05-03 | Fisher & Paykel Healthcare Limited | Medical tubes and methods of manufacture |
-
1990
- 1990-10-31 DE DE19904034611 patent/DE4034611A1/en not_active Withdrawn
Cited By (52)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4233676A1 (en) * | 1992-10-07 | 1994-04-14 | Ego Elektro Blanc & Fischer | Electric radiator for media, especially flow heaters |
US5434388A (en) * | 1992-10-07 | 1995-07-18 | E.G.O. Elektro-Gerate Blanc U. Fischer | Electrical heater for media, particularly flow heater |
EP1681072A2 (en) * | 2000-03-21 | 2006-07-19 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
EP1790370A1 (en) * | 2000-03-21 | 2007-05-30 | Fisher & Paykel Healthcare Limited | Humidification apparatus |
US9555210B2 (en) | 2000-03-21 | 2017-01-31 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
EP1681072A3 (en) * | 2000-03-21 | 2006-08-02 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
US7111624B2 (en) | 2000-03-21 | 2006-09-26 | Fisher & Paykel Healthcare Limited | Apparatus for delivering humidified gases |
US7120354B2 (en) | 2000-03-21 | 2006-10-10 | Fisher & Paykel Healthcare Limited | Gases delivery conduit |
US7146979B2 (en) | 2000-03-21 | 2006-12-12 | Fisher & Paykel Healthcare Limited | Humidifier with parallel gas flow paths |
US6918389B2 (en) | 2000-03-21 | 2005-07-19 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
US10525225B2 (en) | 2000-03-21 | 2020-01-07 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
US7588029B2 (en) | 2000-03-21 | 2009-09-15 | Fisher & Paykel Healthcare Limited | Humidified gases delivery apparatus |
EP1138341A3 (en) * | 2000-03-21 | 2003-08-13 | FISHER & PAYKEL LIMITED | Humidification apparatus |
US8235041B2 (en) | 2000-03-21 | 2012-08-07 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
US8550072B2 (en) | 2000-03-21 | 2013-10-08 | Fisher & Paykel Healthcare Limited | Apparatus for delivering humidified gases |
US9750917B2 (en) | 2000-03-21 | 2017-09-05 | Fisher & Paykel Healthcare Limited | Breathing assistance apparatus |
US10293121B2 (en) | 2000-10-16 | 2019-05-21 | Fisher & Paykel Healthcare Limited | Apparatus used for the humidification of gases in medical procedures |
US11197967B2 (en) | 2000-10-16 | 2021-12-14 | Fisher & Paykel Healthcare Limited | Apparatus used for the humidification of gases in medical procedures |
US10112027B2 (en) | 2001-08-20 | 2018-10-30 | Resmed R&D Germany Gmbh | Apparatus for supplying respiratory gas and a method for controlling the apparatus |
US7997270B2 (en) | 2001-08-20 | 2011-08-16 | Map Medizin-Technologie Gmbh | Apparatus for supplying respiratory gas and a method for controlling the apparatus |
US8671936B2 (en) | 2001-08-20 | 2014-03-18 | Resmed R&D Germany Gmbh | Apparatus for supplying respiratory gas and a method for controlling the apparatus |
US11007340B2 (en) | 2004-08-20 | 2021-05-18 | Fisher & Paykel Healthcare Limited | Apparatus for measuring properties of gases supplied to a patient |
US11911564B2 (en) | 2004-08-20 | 2024-02-27 | Fisher & Paykel Healthcare Limited | Apparatus for measuring properties of gases supplied to a patient |
US11458273B2 (en) | 2004-08-20 | 2022-10-04 | Fisher & Paykel Healthcare Limited | Apparatus for measuring properties of gases supplied to a patient |
US11679224B2 (en) | 2004-08-20 | 2023-06-20 | Fisher & Paykel Healthcare Limited | Apparatus for measuring properties of gases supplied to a patient |
US11013875B2 (en) | 2005-08-15 | 2021-05-25 | ResMed Pty Ltd | Low cost CPAP flow generator and humidifier assembly |
US11298482B2 (en) | 2005-08-15 | 2022-04-12 | ResMed Pty Ltd | Low cost CPAP flow generator and humidifier assembly |
CN100400980C (en) * | 2005-12-14 | 2008-07-09 | 欧永源 | Anti-electric shock type electric water heater |
US11712535B2 (en) | 2006-11-08 | 2023-08-01 | ResMed Pty Ltd | Humidifier for respiratory apparatus |
US11338104B2 (en) | 2006-11-08 | 2022-05-24 | ResMed Pty Ltd | Humidifier for respiratory apparatus |
US9855398B2 (en) | 2006-11-08 | 2018-01-02 | Resmed Limited | Humidifier for respiratory apparatus |
US9802022B2 (en) | 2008-03-06 | 2017-10-31 | Resmed Limited | Humidification of respiratory gases |
US10086158B2 (en) | 2009-07-31 | 2018-10-02 | Resmed Limited | Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus |
US11033698B2 (en) | 2009-07-31 | 2021-06-15 | ResMed Pty Ltd | Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus |
US11607512B2 (en) | 2009-07-31 | 2023-03-21 | ResMed Pty Ltd | Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus |
US8733349B2 (en) | 2009-07-31 | 2014-05-27 | Resmed Limited | Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus |
US11707587B2 (en) | 2009-07-31 | 2023-07-25 | ResMed Pty Ltd | Wire heated tube with temperature control system, tube type detection, and active over temperature protection for humidifier for respiratory apparatus |
US11318270B2 (en) | 2011-06-03 | 2022-05-03 | Fisher & Paykel Healthcare Limited | Medical tubes and methods of manufacture |
US20160354573A1 (en) | 2012-11-14 | 2016-12-08 | Matthew Liam Buswell | Zone heating for respiratory circuits |
US11129954B2 (en) | 2012-11-14 | 2021-09-28 | Fisher & Paykel Healthcare Limited | Zone heating for respiratory circuits |
US10589050B2 (en) | 2012-11-14 | 2020-03-17 | Fisher & Paykel Healthcare Limited | Zone heating for respiratory circuits |
US11058844B2 (en) | 2012-12-04 | 2021-07-13 | Fisher & Paykel Healthcare Limited | Medical tubes and methods of manufacture |
US11260186B2 (en) | 2013-02-01 | 2022-03-01 | ResMed Pty Ltd | Wire heated tube with temperature control system for humidifier for respiratory apparatus |
US10363382B2 (en) | 2013-02-01 | 2019-07-30 | ResMed Pty Ltd | Wire heated tube with temperature control system for humidifier for respiratory apparatus |
US11779719B2 (en) | 2013-02-01 | 2023-10-10 | ResMed Pty Ltd | Wire heated tube with temperature control system for humidifier for respiratory apparatus |
US9572949B2 (en) | 2013-02-01 | 2017-02-21 | Resmed Limited | Wire heated tube with temperature control system for humidifier for respiratory apparatus |
US10814091B2 (en) | 2013-10-24 | 2020-10-27 | Fisher & Paykel Healthcare Limited | System for delivery of respiratory gases |
US10828482B2 (en) | 2013-12-20 | 2020-11-10 | Fisher & Paykel Healthcare Limited | Humidification system connections |
US11826538B2 (en) | 2013-12-20 | 2023-11-28 | Fisher & Paykel Healthcare Limited | Humidification system connections |
US10751498B2 (en) | 2014-03-17 | 2020-08-25 | Fisher & Paykel Healthcare Limited | Medical tubes for respiratory systems |
US10960167B2 (en) | 2015-09-09 | 2021-03-30 | Fisher & Paykel Healthcare Limited | Zone heating for respiratory circuits |
US11311695B2 (en) | 2016-12-22 | 2022-04-26 | Fisher & Paykel Healthcare Limited | Medical tubes and methods of manufacture |
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