EP1274939A1 - Measuring gas pump - Google Patents
Measuring gas pumpInfo
- Publication number
- EP1274939A1 EP1274939A1 EP01917019A EP01917019A EP1274939A1 EP 1274939 A1 EP1274939 A1 EP 1274939A1 EP 01917019 A EP01917019 A EP 01917019A EP 01917019 A EP01917019 A EP 01917019A EP 1274939 A1 EP1274939 A1 EP 1274939A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- connecting rod
- crank mechanism
- pump
- sample gas
- gas pump
- 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
Links
Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/06—Cooling; Heating; Prevention of freezing
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0005—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons
- F04B39/0022—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 adaptations of pistons piston rods
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/0094—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00 crankshaft
Definitions
- the invention relates to a sample gas pump with a pump housing, a pump chamber located therein, which is closed off by a working membrane which is connected to a crank mechanism via a connecting rod or similar lifting element, a heating device being provided in the upper region of the pump housing, in particular in the pump head is.
- Pumps of this type are used to convey hot measuring gases, the temperature of which should be maintained as far as possible in the removal state. Condensation of analysis gas components and falsification of the measurement result should be avoided.
- a heater in the pump head in order to reduce the temperature of the to prevent or at least reduce the gas to be measured in the area of the pump chamber.
- This heating provided in the area of the pump head has the undesirable side effect that heating of the diaphragm-side connecting rod head and, via the connecting rod, heating of the crank mechanism also occurs, the connecting rod bearing in particular being able to be damaged.
- the object of the present invention is to reduce the heat transfer between the pump head and the crank mechanism, in particular the connecting rod bearing, while largely avoiding the disadvantages described above.
- Cooling fins are expediently provided as the surface enlargement, which are arranged in the connecting rod head receiving the connecting rod, near the crank mechanism, in particular in its conical transition region.
- the cooling by the cooling fins is particularly effective due to the crank or eccentric movement, so that, in particular despite high temperatures in the area of the connecting rod head, there is practically no increased temperature load on the Connecting rod bearings and their surroundings occur.
- Adjacent through holes are preferably offset circumferentially from one another by 90 ° C. and preferably have a center distance of less than the diameter. Due to this lateral offset of the holes in the longitudinal direction of the connecting rod, the holes interlock and thereby result in particularly good ventilation and cooling in this area as well, but the strength of the connecting rod is largely retained.
- one or more through holes can be provided in the connecting rod head close to the crank mechanism, preferably in the area between the cooling fins and the connecting rod bearing, to reduce the thermal conductivity and / or to dissipate the heat, in particular to the adjacent cooling fins. On the one hand, this reduces the heat-conducting cross-sectional area, and on the other hand, air circulation and thus heat dissipation can also be achieved through the holes. In addition, a targeted guidance of the heat to the cooling fins is favored.
- the connecting rod is advantageously made of steel, in particular stainless steel.
- Stainless steel has the advantage of lower thermal conductivity and good strength properties compared to the aluminum that is usually used for the connecting rod.
- the measures according to one or more of claims 1 to 5 are preferably provided in the case of a sample gas pump which has at least thermal insulation that overlaps the pump head, the thermal insulation being essentially formed by an insulation housing, the inner wall of which is spaced apart from the pump head to form a gas insulation layer. Due to the effective insulation of the pump head, practically no heat can escape, so that the measures according to the invention for reducing the heat transfer in the direction of the connecting rod bearing and crank mechanism are of particular importance.
- the invention is described in more detail below with its essential details.
- 1 is a longitudinal sectional view of a sample gas pump
- Fig. 2 shows a partial section of a connecting rod
- Fig. 3 is a cross-sectional view of a connecting rod in the area of a through hole.
- a measuring gas pump 1 shown in FIG. 1 has a pump housing 2 with a pump chamber 3 located therein, which is closed on the one hand by a pump head cover 4 and on the other hand by a working diaphragm 5 and a connecting rod head 6.
- the working diaphragm 5 is clamped on the outer edge side between the pump head cover 4 and an annular housing part 7 and centrally at the connecting rod head 6 and is connected to a crank mechanism 9 via a connecting rod 8 connected to the connecting rod head 6.
- the sample gas pump is a heated pump which has a heating device in the pump head 10. This allows the pump head to be heated to several 100 ° C if necessary.
- measures for reducing the heat transfer to the crank mechanism 9 are provided in the area of the drive transmission.
- through holes 11 are provided which are spaced in the longitudinal direction of the connecting rod and offset in the circumferential direction. As can be clearly seen in the enlarged illustration according to FIG. 2, there are adjacent through holes 11 offset by 90 ° to each other and have a center distance of less than the hole diameter. The perforated channels are thus connected. As a result, the thermal conductivity of the connecting rod 8 is reduced on the one hand and the through holes 11 furthermore promote good ventilation and thus heat dissipation. Due to the offset of the through holes 11 and the connection of their channels, good strength values are obtained in spite of the reduction in thermal conductivity achieved and the increased heat radiation.
- two adjacent through holes 11 are provided. Depending on the length of the connecting rod, more than two through holes 11 can also be provided.
- cooling fins 12 For heat radiation, an enlargement of the surface by means of cooling fins 12 is provided at least in the area near the crank drive, which are arranged in the exemplary embodiment in the conical transition area of the connecting rod head near the crank drive. Effective heat radiation is thus achieved in this area, which can be further supported by preferably providing one or more further through holes 11a between the cooling fins 12 and the connecting rod bearing.
- the through holes 11a are arranged such that heat is also conducted to the adjacent cooling fins and there is heat radiation, as indicated by the arrows in FIG. 1.
- the measures described above for reducing the heat transfer from the pump head to the crank mechanism are particularly effective advantageous in a sample gas pump which has at least one heat insulation overlapping the pump head, the heat insulation being essentially formed by an insulation housing 13, the inner wall of which is spaced apart from the pump head 10 to form a gas insulation layer 14.
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Compressor (AREA)
- Reciprocating Pumps (AREA)
- Sampling And Sample Adjustment (AREA)
- Shafts, Cranks, Connecting Bars, And Related Bearings (AREA)
Abstract
The invention relates to a measuring gas pump (1)having a housing (2) with a pump chamber (3) located therein, which is closed by a working membrane (5). The membrane (5) is connected to a crank mechanism (9) by means of a connecting rod (8) or a similar lifting organ. A heating device is provided in the upper area of the pump housing, especially in the head of the pump (10). In order to reduce heat transmission to the crank mechanism, through holes (11) that reduce heat conductivity, that are spaced in the longitudinal direction of the connecting rod and that are offset in peripheral direction are provided in the drive-transmission area between the head of the connecting rod (6) located on the membrane side and the crank mechanism (9). Furthermore, a surface enlargement, especially by means of cooling ribs (12), is provided for heat dissipation at least in the area close to the crank mechanism.
Description
Meßgaspumpe gas pump
Die Erfindung bezieht sich auf eine Meßgaspumpe mit einem Pumpengehäuse, einem darin befindlichen Pumpenraum, der von einer Arbeitsmembran abgeschlossenen ist, die über einen Pleuel oder dergleichen Huborgan mit einem Kurbeltrieb in Antriebsverbindung steht, wobei im oberen Bereich des Pumpengehäuses, insbesondere im Pumpenkopf eine Heizeinrichtung vorgesehen ist.The invention relates to a sample gas pump with a pump housing, a pump chamber located therein, which is closed off by a working membrane which is connected to a crank mechanism via a connecting rod or similar lifting element, a heating device being provided in the upper region of the pump housing, in particular in the pump head is.
Solche Pumpen dienen zum Fördern heißer Meßgase, deren Temperatur möglichst im Entnahme-Zustand erhalten bleiben soll. Eine Kondensation von Analysegasbestandteilen, ein Verfälschen des Meßergebnisses sollen vermieden werden. Um bei solchen Heiß- gaspumpen die Bereiche, die mit dem zu messenden Gas in Verbindung kommen, auf der etwa durch die Entnahmestelle des zu messenden Gases vorgegebenen Temperatur zu halten, ist bereits bekannt, im Pumpenkopf eine Heizung vorzusehen, um ein Absinken der Temperatur des zu messenden Gases im Bereich des Pumpraumes zu verhindern oder wenigstens vermindern.Pumps of this type are used to convey hot measuring gases, the temperature of which should be maintained as far as possible in the removal state. Condensation of analysis gas components and falsification of the measurement result should be avoided. In order to keep the areas that come into contact with the gas to be measured at the temperature predetermined by the point of removal of the gas to be measured in such hot gas pumps, it is already known to provide a heater in the pump head in order to reduce the temperature of the to prevent or at least reduce the gas to be measured in the area of the pump chamber.
Durch diese im Bereich des Pumpenkopfes vorgesehene Heizung ergibt sich der unerwünschte Nebeneffekt, daß auch eine Erwärmung des membranseitigen Pleuelkopfes und über den Pleuel eine Erwärmung des Kurbeltriebs auftritt, wobei insbesondere das Pleuellager Schaden nehmen kann.This heating provided in the area of the pump head has the undesirable side effect that heating of the diaphragm-side connecting rod head and, via the connecting rod, heating of the crank mechanism also occurs, the connecting rod bearing in particular being able to be damaged.
Aus der DE 3526882 C2 ist es bereits bekannt, den Pleuel in Längsrichtung und in Querrichtung mehrfach zu lochen, wobei sich betreffend die Längserstreckung des Pleuels, in gleicher Position befindliche Querbohrungen schneiden. Damit wird zwar ein Materialreduzierung imWärmeübertragungsweg und damit ein höherer Wärmewiderstand geschaffen, jedoch ergibt sich in unerwünschter Weise auch eine erheblich Festigkeitsreduzierung durch die sich mit ihren Mittelachse direkt kreuzenden Querbohrungen. Diese Festigkeitsreduzierung kann zwar durch größere Dimensionierung
des Pleuelquerschnittes kompensiert werden, wodurch aber wiederum der Wärmewiderstand in unerwünschter Weise reduziert wird.From DE 3526882 C2 it is already known to punch the connecting rod several times in the longitudinal direction and in the transverse direction, with cross bores in the same position intersecting with respect to the longitudinal extension of the connecting rod. Although this results in a reduction in material in the heat transfer path and thus a higher thermal resistance, it also undesirably results in a considerable reduction in strength due to the cross bores crossing directly with their central axis. This reduction in strength can be achieved through larger dimensions of the connecting rod cross-section can be compensated, but this in turn undesirably reduces the thermal resistance.
Aufgabe der vorliegenden Erfindung ist es, unter weitgehender Vermeidung der vorbeschriebenen Nachteile, die Wärmeübertragung zwischen dem Pumpenkopf und dem Kurbeltrieb, insbesondere dem Pleuellager zu reduzieren.The object of the present invention is to reduce the heat transfer between the pump head and the crank mechanism, in particular the connecting rod bearing, while largely avoiding the disadvantages described above.
Zur Lösung dieser Aufgabe wird vorgeschlagen, daß im Antriebs- Übertragungsbereich zwischen membranseitigem Pleuelkopf und Kurbeltrieb, zur Reduzierung der Wärmeübertragung auf den Kurbeltrieb, einerseits die Wärmeleitfähigkeit reduzierende, in Pleuellängsrichtung beabstandete und in Umfangsrichtung versetzte Durchgangslöcher und andererseits zur Wärmeabstrahlung zumindest im Kurbeltrieb-nahen Bereich eine Oberflächenvergrößerung vorgesehen sind.To solve this problem, it is proposed that in the drive transmission area between the connecting rod end of the connecting rod and the crank mechanism, to reduce the heat transfer to the crank mechanism, on the one hand reducing the thermal conductivity, spaced in the longitudinal direction of the connecting rod and offset in the circumferential direction, and on the other hand for heat radiation at least in the vicinity of the crank mechanism Surface enlargement are provided.
Die Kombination dieser einfach zur realisierenden Maßnahmen führt zur einer wirksamen Reduzierung der Temperatur des Pleuellagers mit der Folge einer entsprechenden Verlängerung der Lebensdauer. Die seitlich beabstandeten und in Umfangsrichtung versetzten Durchgangslöcher reduzieren den wärmeübertragenden Querschnitt des Pleuels, reduzieren durch den Längsversatz der Löcher die Festigkeit aber nur unwesentlich. Am Kurbeltrieb-nahen Ende des Pleuels noch anfallende Wärme kann schließlich wirksam durch die dort vorgesehene Oberflächenvergrößerung an die Umgebung abgeführt werden.The combination of these simple to implement measures leads to an effective reduction in the temperature of the connecting rod bearing, with the consequence of a corresponding extension of the service life. The laterally spaced and circumferentially offset through holes reduce the heat-transmitting cross-section of the connecting rod, but only insignificantly reduce the strength due to the longitudinal offset of the holes. Finally, heat still accumulating at the end of the connecting rod near the crank mechanism can be effectively dissipated to the environment by the surface enlargement provided there.
Dabei sind als Oberflächenvergrößerung zweckmäßigerweise Kühlrippen vorgesehen, die in dem die Pleuelstange aufnehmenden, Kurbeltrieb-nahen Pleuelkopf, insbesondere in dessen konischem Übergangsbereich angeordnet sind. Die Kühlung durch die Kühlrippen ist durch die Kurbel- oder Exzenterbewegung besonders wirksam, so daß insbesondere trotz hoher Temperaturen im Bereich des Pleuelkopfes praktisch keine erhöhte Temperaturbelastung des
Pleuellagers und dessen Umgebung auftritt.Cooling fins are expediently provided as the surface enlargement, which are arranged in the connecting rod head receiving the connecting rod, near the crank mechanism, in particular in its conical transition region. The cooling by the cooling fins is particularly effective due to the crank or eccentric movement, so that, in particular despite high temperatures in the area of the connecting rod head, there is practically no increased temperature load on the Connecting rod bearings and their surroundings occur.
Vorzugsweise sind benachbarte Durchgangslöcher um 90 °C zueinander umfangsversetzt und weisen vorzugsweise einen Mittelabstand von weniger als dem Durchmesser auf. Durch diesen Seitenversatz der Löcher in Längsrichtung des Pleuels greifen die Löcher zwar ineinander und ergeben dadurch eine besonders gute Durchlüftung und Kühlung auch in diesem Bereich, die Festigkeit des Pleuels bleibt aber weitestgehend erhalten. Gegebenenfalls können im Kurbeltrieb-nahen Pleuelkopf, vorzugs- weise im Bereich zwischen den Kühlrippen und dem Pleuellager, eine oder mehrere Durchgangslöcher zur Reduzierung der Wärmeleitfähigkeit und/oder zur Ableitung der Wärme insbesondere zu den benachbart angeordneten Kühlrippen vorgesehen sind. Damit wird einerseits die wärmeleitende Querschnittsfläche reduziert und andererseits kann durch die Löcher auch eine Luftzirkulation und damit eine Wärmeabfuhr erreicht werden. Außerdem ist eine gezielte Führung der Wärme zu den Kühlrippen hin begünstigt.Adjacent through holes are preferably offset circumferentially from one another by 90 ° C. and preferably have a center distance of less than the diameter. Due to this lateral offset of the holes in the longitudinal direction of the connecting rod, the holes interlock and thereby result in particularly good ventilation and cooling in this area as well, but the strength of the connecting rod is largely retained. If necessary, one or more through holes can be provided in the connecting rod head close to the crank mechanism, preferably in the area between the cooling fins and the connecting rod bearing, to reduce the thermal conductivity and / or to dissipate the heat, in particular to the adjacent cooling fins. On the one hand, this reduces the heat-conducting cross-sectional area, and on the other hand, air circulation and thus heat dissipation can also be achieved through the holes. In addition, a targeted guidance of the heat to the cooling fins is favored.
Vorteilhafterweise besteht der Pleuel aus Stahl, insbesondere aus Edelstahl . Edelstahl hat gegenüber dem sonst meist verwendeten Aluminium für den Pleuel den Vorteil der geringeren Wärmeleitfähigkeit bei gleichzeitig guten Festigkeitseigenschaften.The connecting rod is advantageously made of steel, in particular stainless steel. Stainless steel has the advantage of lower thermal conductivity and good strength properties compared to the aluminum that is usually used for the connecting rod.
Die Maßnahmen gemäß einem oder mehreren der Ansprüche 1 bis 5 sind bevorzugt vorgesehen bei einer Meßgaspumpe, die eine zumindest den Pumpenkopf übergreifende Wärmeisolierung aufweist, wobei die Wärmeisolierung im wesentlichen durch ein Isolationsgehäuse gebildet ist, dessen Innenwand zur Bildung einer Gasisolationsschicht zu dem Pumpenkopf beabstandet ist. Durch die wirksame Isolierung des Pumpenkopfes kann praktisch keine Wärme austreten, so daß hierbei den erfindungsgemäßen Maßnahmen zur Reduzierung der Wärmeweiterleitung in Richtung Pleuellager und Kurbeltrieb besondere Bedeutung zukommt.
Nachstehend ist die Erfindung mit ihren wesentlichen Einzelheiten noch näher beschrieben.The measures according to one or more of claims 1 to 5 are preferably provided in the case of a sample gas pump which has at least thermal insulation that overlaps the pump head, the thermal insulation being essentially formed by an insulation housing, the inner wall of which is spaced apart from the pump head to form a gas insulation layer. Due to the effective insulation of the pump head, practically no heat can escape, so that the measures according to the invention for reducing the heat transfer in the direction of the connecting rod bearing and crank mechanism are of particular importance. The invention is described in more detail below with its essential details.
Es zeigt:It shows:
Fig. 1 eine Längsschnittdarstellung einer Meßgaspumpe,1 is a longitudinal sectional view of a sample gas pump,
Fig. 2 einen Teilausschnitt eines Pleuels undFig. 2 shows a partial section of a connecting rod and
Fig. 3 eine Querschnittdarstellung eines Pleuels im Bereich einer Durchgangslochung.Fig. 3 is a cross-sectional view of a connecting rod in the area of a through hole.
Eine in Fig. 1 gezeigte Meßgaspumpe 1 weist ein Pumpengehäuse 2 mit einem darin befindlichen Pumpenraum 3 auf, der einerseits von einem Pumpenkopfdeckel 4 und andererseits von einer Arbeitsmembrane 5 sowie einem Pleuelkopf 6 abgeschlossen ist. Die Arbeitsmembrane 5 ist außenrandseitig zwischen dem Pumpenkopfdeckel 4 und einem ringförmigen Gehäuseteil 7 sowie zentral beim Pleuelkopf 6 eingespannt und über einen mit dem Pleuelkopf 6 verbundenen Pleuel 8 mit einem Kurbeltrieb 9 verbunden.A measuring gas pump 1 shown in FIG. 1 has a pump housing 2 with a pump chamber 3 located therein, which is closed on the one hand by a pump head cover 4 and on the other hand by a working diaphragm 5 and a connecting rod head 6. The working diaphragm 5 is clamped on the outer edge side between the pump head cover 4 and an annular housing part 7 and centrally at the connecting rod head 6 and is connected to a crank mechanism 9 via a connecting rod 8 connected to the connecting rod head 6.
Bei der Meßgaspumpe handelt es sich um eine beheizte Pumpe, die im Pumpenkopf 10 eine Heizeinrichtung aufweist. Damit kann der Pumpenkopf bedarfsweise auf mehrere 100 °C aufgeheizt werden. Um zu verhindern, daß eine Wärmeübertragung von dem Pumpenkopf 10 auf den Kurbeltrieb 9 in einem für das Pleuellager schädlichen Maß auftritt, sind im Bereich der Antriebs-Übertragung Maßnahmen zur Reduzierung der Wärmeübertragung auf den Kurbeltrieb 9 vorgesehen.The sample gas pump is a heated pump which has a heating device in the pump head 10. This allows the pump head to be heated to several 100 ° C if necessary. In order to prevent heat transfer from the pump head 10 to the crank mechanism 9 to an extent that is harmful to the connecting rod bearing, measures for reducing the heat transfer to the crank mechanism 9 are provided in the area of the drive transmission.
Zur Reduzierung der Wärmeleitfähigkeit sind in Pleuellängsrichtung beabstandete und in Umfangsrichtung versetzte Durchgangslöcher 11 vorgesehen. Wie in der vergrößerten Darstellung gemäß Fig. 2 deutlich erkennbar ist, sind benachbarte Durchgangslöcher 11
um 90° zueinander umfangsversetzt und weisen einen Mittenabstand von weniger als dem Lochdurchmesser auf. Die Lochkanäle sind somit verbunden. Dadurch ist einerseits die Wärmeleitfähigkeit des Pleuels 8 verringert und die Durchgangslöcher 11 begünstigen darüber hinaus eine gute Durchlüftung und damit Wärmeabfuhr. Durch den Versatz der Durchgangslöcher 11 und die Verbindung ihrer Kanäle ergeben sich trotz der erzielten Wärmeleitfähigkeits- Reduzierung und der erhöhten Warmeabstrahlung noch gute Festigkeitswerte . Im Ausführungsbeispiel sind zwei benachbarte Durchgangslöcher 11 vorgesehen. Je nach Länge des Pleuels können aber auch mehr als zwei Durchgangslöcher 11 vorgesehen sein.In order to reduce the thermal conductivity, through holes 11 are provided which are spaced in the longitudinal direction of the connecting rod and offset in the circumferential direction. As can be clearly seen in the enlarged illustration according to FIG. 2, there are adjacent through holes 11 offset by 90 ° to each other and have a center distance of less than the hole diameter. The perforated channels are thus connected. As a result, the thermal conductivity of the connecting rod 8 is reduced on the one hand and the through holes 11 furthermore promote good ventilation and thus heat dissipation. Due to the offset of the through holes 11 and the connection of their channels, good strength values are obtained in spite of the reduction in thermal conductivity achieved and the increased heat radiation. In the exemplary embodiment, two adjacent through holes 11 are provided. Depending on the length of the connecting rod, more than two through holes 11 can also be provided.
Zur Warmeabstrahlung ist zumindest im kurbeltrieb-nahen Bereich eine Oberflächenvergrößerung durch Kühlrippen 12 vorgesehen, die im Ausführungsbeispiel in dem konischen Übergangsbereich des Kurbeltrieb-nahen Pleuelkopfes angeordnet sind. Damit wird eine wirksame Warmeabstrahlung in diesem Bereich erzielt, wobei dies noch unterstützt werden kann, indem vorzugsweise zwischen den Kühlrippen 12 und dem Pleuellager ein oder mehrere, weitere Durchgangslöcher 11a vorgesehen sind. Die Durchgangslöcher 11a sind so angeordnet, daß auch eine Wärmeführung zu den benachbarten Kühlrippen und dort eine Warmeabstrahlung erfolgt, wie dies durch die Pfeile in Fig.1 angedeutet ist. Die Kombination aus reduzierter Wärmeleitfähigkeit einerseits und erhöhter Wärmeabstrahlmöglichkeit andererseits ergibt auf dem Wärmeübertragungsweg zwischen Pumpenkopf 10 und Kurbeltrieb 9 eine starke Temperaturabsenkung, so daß an dem Pleuellager trotz hoher Betriebstemperaturen im Bereich des Pumpenkopfes 10 nur noch übliche und für das Pleuellager unschädliche Betriebstemperaturen auftreten.For heat radiation, an enlargement of the surface by means of cooling fins 12 is provided at least in the area near the crank drive, which are arranged in the exemplary embodiment in the conical transition area of the connecting rod head near the crank drive. Effective heat radiation is thus achieved in this area, which can be further supported by preferably providing one or more further through holes 11a between the cooling fins 12 and the connecting rod bearing. The through holes 11a are arranged such that heat is also conducted to the adjacent cooling fins and there is heat radiation, as indicated by the arrows in FIG. 1. The combination of reduced thermal conductivity on the one hand and increased possibility of heat radiation on the other hand results in a strong temperature reduction on the heat transfer path between pump head 10 and crank mechanism 9, so that, despite high operating temperatures in the area of pump head 10, only normal operating temperatures that are harmless to the connecting rod bearing occur on the connecting rod bearing.
Die vorbeschriebenen Maßnahmen zur Reduzierung der Wärmeübertragung vom Pumpenkopf auf den Kurbeltrieb, wirken sich besonders
vorteilhaft bei einer Meßgaspumpe aus, die eine zumindest den Pumpenkopf übergreifende Wärmeisolierung aufweist, wobei die Wärmeisolierung im wesentlichen durch ein Isolationsgehäuse 13 gebildet ist, dessen Innenwand zur Bildung einer Gasisolationsschicht 14 zu dem Pumpenkopf 10 beabstandet ist.
The measures described above for reducing the heat transfer from the pump head to the crank mechanism are particularly effective advantageous in a sample gas pump which has at least one heat insulation overlapping the pump head, the heat insulation being essentially formed by an insulation housing 13, the inner wall of which is spaced apart from the pump head 10 to form a gas insulation layer 14.
Claims
1. Meßgaspumpe mit einem Pumpengehäuse, einem darin befindlichen Pumpenraum, der von einer Arbeitsmembran abgeschlossenen ist, die über einen Pleuel oder dergleichen Huborgan mit einem Kurbeltrieb in Antriebsverbindung steht, wobei im oberen Bereich des Pumpengehäuses, insbesondere im Pumpenkopf eine Heizeinrichtung vorgesehen ist, dadurch gekennzeichnet, daßimAntriebs-Übertragungsbereichzwischenmembranseitigem Pleuelkopf (6) und Kurbeltrieb (9) , zur Reduzierung der Wärmeübertragung auf den Kurbeltrieb, einerseits die Wärmeleitfähigkeit reduzierende, in Pleuellängsrichtung beabstandete und in Umfangsrichtung versetzte Durchgangs- löcher (11,11a) und andererseits zur Warmeabstrahlung zumindest im kurbeltriebnahen Bereich eine Oberflächenvergrößerung (12) vorgesehen sind.1. Sample gas pump with a pump housing, a pump chamber located therein, which is closed off by a working membrane, which is connected to a crank mechanism via a connecting rod or similar lifting element, a heating device being provided in the upper region of the pump housing, in particular in the pump head, characterized in that that in the drive transmission area between the connecting rod end (6) and the crank mechanism (9) to reduce the heat transfer to the crank mechanism, on the one hand reducing the thermal conductivity, spaced in the longitudinal direction of the connecting rod and offset in the circumferential direction through holes (11,11a) and on the other hand for heat radiation at least in the area close to the crank mechanism a surface enlargement (12) is provided.
2. Meßgaspumpe nach Anspruch 1, dadurch gekennzeichnet, daß benachbarte Durchgangslöcher (11) um 90° zueinander umfangsversetzt sind und vorzugsweise einen Mittelabstand von weniger als dem Durchmesser aufweisen.2. Sample gas pump according to claim 1, characterized in that adjacent through holes (11) are circumferentially offset from one another by 90 ° and preferably have a center distance of less than the diameter.
3. Meßgaspumpe nach Anspruch 1 oder 2 , dadurch gekennzeichnet , daß als Oberflächenvergrößerung Kühlrippen (12) vorgesehen sind, die in dem die Pleuelstange aufnehmenden, Kurbeltrieb- nahen Pleuelkopf, insbesondere in dessen konischem Übergangsbereich angeordnet sind.3. Sample gas pump according to claim 1 or 2, characterized in that cooling fins (12) are provided as the surface enlargement, which are arranged in the connecting rod receiving the connecting rod, near the crank mechanism, in particular in its conical transition region.
4. Meßgaspumpe nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß vorzugsweise im Bereich zwischen den Kühlrippen (12) und dem Pleuellager, im Kurbeltrieb-nahen Pleuelkopf eine oder mehrere Durchgangslöcher (11a) zur Reduzierung der Wärmeleitfähigkeit und/oder zur Ableitung der Wärme insbesondere zu den benachbart angeordneten Kühlrippen vorgesehen sind.4. Sample gas pump according to one of claims 1 to 3, characterized in that preferably in the area between the cooling fins (12) and the connecting rod bearing, in the connecting rod head near the crank mechanism, one or more through holes (11a) for reducing the thermal conductivity and / or for dissipation the heat is provided in particular to the cooling fins arranged adjacent.
5. Meßgaspumpe nach einem der Ansprüche 1 bis 3 , dadurch gekennzeichnet, daß der Pleuel (8) aus Stahl, insbesondere aus Edelstahl besteht.5. Sample gas pump according to one of claims 1 to 3, characterized in that the connecting rod (8) consists of steel, in particular stainless steel.
6. Meßgaspumpe, dadurch gekennzeichnet, daß die Maßnahmen gemäß einem oder mehreren der Ansprüche 1 bis 5 vorgesehen sind bei einer Meßgaspumpe (1 ) die eine zumindest den Pumpenkopf übergreifende Wärmeisolierung aufweist, wobei die Wärmeisolierung im wesentlichen durch ein Isolationsgehäuse gebildet ist, dessen Innenwand zur Bildung einer Gasisolationsschicht zu dem Pumpenkopf beabstandet ist. 6. Sample gas pump, characterized in that the measures according to one or more of claims 1 to 5 are provided in a sample gas pump (1) which has at least the pump head overlapping thermal insulation, the thermal insulation being essentially formed by an insulation housing, the inner wall of which Forming a gas insulation layer is spaced from the pump head.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE10019724 | 2000-04-20 | ||
| DE10019724 | 2000-04-20 | ||
| PCT/EP2001/002066 WO2001081762A1 (en) | 2000-04-20 | 2001-02-23 | Measuring gas pump |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP1274939A1 true EP1274939A1 (en) | 2003-01-15 |
| EP1274939B1 EP1274939B1 (en) | 2005-10-19 |
Family
ID=7639535
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP01917019A Expired - Lifetime EP1274939B1 (en) | 2000-04-20 | 2001-02-23 | Measuring gas pump |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US6827558B2 (en) |
| EP (1) | EP1274939B1 (en) |
| JP (1) | JP4550348B2 (en) |
| DE (1) | DE50107750D1 (en) |
| WO (1) | WO2001081762A1 (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10231515C1 (en) * | 2002-07-12 | 2003-07-10 | Draeger Safety Ag & Co Kgaa | Gas analyzer, with head including sensor and pump, has connection plane with gas sockets into which adaptor can be plugged in different orientations |
| JP6460236B2 (en) * | 2015-07-03 | 2019-01-30 | 三菱電機株式会社 | Heat pump equipment |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE3526882A1 (en) * | 1985-07-26 | 1987-01-29 | Otto Hayn | Gas pump or compressor |
| DE8602787U1 (en) * | 1986-02-04 | 1986-03-13 | Becker, Erich, 7812 Bad Krozingen | Diaphragm pump with thermal insulation |
| DE3704700A1 (en) * | 1987-02-14 | 1988-08-25 | Bodenseewerk Geraetetech | HEATABLE DIAPHRAGM PUMP FOR GASES |
| DE4322272C2 (en) * | 1993-07-05 | 1997-02-06 | Knf Neuberger Gmbh | Sample gas pump |
| US5513956A (en) * | 1994-01-14 | 1996-05-07 | Arrow International Investment Corp. | Circulatory assisted device with motor driven gas pump |
-
2001
- 2001-02-23 WO PCT/EP2001/002066 patent/WO2001081762A1/en active IP Right Grant
- 2001-02-23 JP JP2001578819A patent/JP4550348B2/en not_active Expired - Fee Related
- 2001-02-23 US US10/258,158 patent/US6827558B2/en not_active Expired - Lifetime
- 2001-02-23 DE DE50107750T patent/DE50107750D1/en not_active Expired - Lifetime
- 2001-02-23 EP EP01917019A patent/EP1274939B1/en not_active Expired - Lifetime
Non-Patent Citations (1)
| Title |
|---|
| See references of WO0181762A1 * |
Also Published As
| Publication number | Publication date |
|---|---|
| JP4550348B2 (en) | 2010-09-22 |
| US6827558B2 (en) | 2004-12-07 |
| WO2001081762A1 (en) | 2001-11-01 |
| JP2003532007A (en) | 2003-10-28 |
| DE50107750D1 (en) | 2006-03-02 |
| EP1274939B1 (en) | 2005-10-19 |
| US20030103851A1 (en) | 2003-06-05 |
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