EP0684383B1 - Pompe doseuse de fluides - Google Patents

Pompe doseuse de fluides Download PDF

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Publication number
EP0684383B1
EP0684383B1 EP95106393A EP95106393A EP0684383B1 EP 0684383 B1 EP0684383 B1 EP 0684383B1 EP 95106393 A EP95106393 A EP 95106393A EP 95106393 A EP95106393 A EP 95106393A EP 0684383 B1 EP0684383 B1 EP 0684383B1
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EP
European Patent Office
Prior art keywords
valve
pump according
valve seat
valve element
pump chamber
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.)
Expired - Lifetime
Application number
EP95106393A
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German (de)
English (en)
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EP0684383A1 (fr
Inventor
Walter Dipl. Ing. Hetzel
Josef Braun
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.)
Prominent Dosiertechnik GmbH
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Prominent Dosiertechnik GmbH
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Publication date
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Application filed by Prominent Dosiertechnik GmbH filed Critical Prominent Dosiertechnik GmbH
Publication of EP0684383A1 publication Critical patent/EP0684383A1/fr
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Classifications

    • 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
    • F04B53/00—Component parts, details or accessories not provided for in, or of interest apart from, groups F04B1/00 - F04B23/00 or F04B39/00 - F04B47/00
    • F04B53/06—Venting

Definitions

  • the invention relates to a liquid metering pump with a pump chamber, the volume of which increases during a suction stroke and decreases at a pressure, and at the upper end of which a vent valve device is arranged which has a flow-actuated vent valve, the response of which is determined by the physical state of the medium flowing through.
  • the vent valve has a membrane as a valve element.
  • the membrane can rest against a sealing surface and thus close the outlet from the pump chamber in the area of the vent valve device.
  • the force to apply the membrane is only applied when liquid is present. As long as gas flows out, the dynamic pressure is not high enough to bring the membrane to close.
  • US-A-2 543 828 describes a device for the controlled injection of fluids, in which a pump chamber is connected to an auxiliary chamber, the volume of which is variable.
  • the auxiliary chamber is limited by two valve seats, the distance between which can be changed.
  • a valve ball in the auxiliary chamber can come to rest either on the one valve seat which is adjacent to the pump chamber or on the other valve seat.
  • liquid is displaced into the auxiliary chamber until it is filled. In this state, the valve ball closes the auxiliary chamber. Only then is fluid released through the outlet of the pump chamber. The quantity dispensed thus corresponds to the volume of the pump chamber or the piston stroke minus the volume of the auxiliary chamber.
  • JP-A-60 256 572 shows a reciprocating pump with an automatic degassing device which has a vent valve which is arranged at the top of the pump chamber. All valves, i.e. inlet valve, outlet valve and vent valve, are designed as two-stage check valves.
  • the venting behavior can be controlled relatively precisely.
  • the amount of liquid escaping through the vent valve is relatively small.
  • One possible explanation for this behavior would be that the gas only gets behind the membrane when the pump chamber is vented. Since the membrane closes practically immediately as soon as liquid is present, the gas located there is no longer conveyed.
  • the membrane opens again and the gas behind it is sucked into the pump chamber.
  • the check valve located behind the vent valve does not change this. This only prevents air or gas from being sucked in from the outside. However, it cannot prevent gas still located between the vent valve and the check valve from being sucked back into the pump chamber.
  • the gas inclusions in the pump chamber change the metering behavior of the pump and are therefore undesirable. They will be pushed out of the pump chamber at the next pump play, but are still behind the vent valve available.
  • the dead spaces of the known arrangement lead to inaccuracies, particularly in the case of small delivery quantities, a typical application of metering pumps.
  • the invention has for its object to improve the pumping behavior of a metering pump with a vent valve.
  • the fluid emerging from the pump chamber during the venting process is hereby prevented from re-entering the pump chamber during a suction stroke.
  • This blocking is independent of whether the fluid is still gas or already liquid. Since the vent valve is only arranged in the flow direction behind the back suction valve, in the area between the vent valve and the back suction valve practically only liquid will be present at the end of the vent. This is a further safeguard against gas being sucked in during a suction stroke. This reliably closes a path with which parasitic gas residues can be sucked in. Undesired dead spaces are avoided.
  • the back suction valve is normally closed and only opens when the fluid flows out of the pump chamber.
  • the anti-suckback valve therefore does not require any backflow to be closed. Rather, it closes when there is no flow out of the pump chamber. During the backflow, which would otherwise be necessary until the back suction valve is closed, no further gas residues can be introduced into the pump chamber.
  • the vent valve and the anti-suckback valve advantageously have a common valve element. This measure ensures that the flow path between the anti-suckback valve and the vent valve is relatively short. The amount of liquid escaping, which is no longer immediately available for consumption due to the anti-return valve, remains small. This is particularly advantageous if the liquid to be dosed is toxic or aggressive. In this case, correspondingly small amounts of liquid have to be treated.
  • the valve element is freely movable between a first valve seat, which is a component of the anti-suckback valve, and a second valve seat, which is a component of the vent valve, flow through the vent valve device being possible only in one position of the valve element between the first and second valve seats.
  • the back suction protection valve is opened as soon as a flow out of the pump chamber occurs.
  • the forces exerted by the flow on the valve element are not yet large enough to bring the valve element into contact with the second valve seat.
  • the valve element is thus, so to speak, in a floating state or in an intermediate position between the first and the second valve seat.
  • the valve element is preferably designed as a ball. With a ball, the orientation of the valve element is practically irrelevant. Regardless of how the ball has rotated, it is always possible to seal against the first or the second valve seat. Rotation of the ball may even be desirable. As a result, a different point on the ball surface always comes into contact with the respective valve seats, so that the risk of leakage due to local wear remains relatively low.
  • the vent valve device advantageously has a valve housing with an interior in which the valve element is arranged and which tapers in the direction of the second valve seat arranged at its outlet.
  • the valve housing provides a guide for the valve element, ie the movements of the valve element transverse to the flow direction are limited.
  • the valve element is therefore always brought into contact with the respective valve seats with high reliability.
  • the tapering of the interior towards the second valve seat counteracts the formation of dead spaces, so that no gases can accumulate here. These gases would be largely harmless because the back suction valve prevents them from being sucked back into the pump chamber.
  • Such dead spaces are more critical for media that contain solids. These could deposit and sooner or later block the outflow path, which could impair the ventilation function.
  • the volume of the interior preferably has 1.5 to 3 times the volume of the valve element.
  • the interior is larger than the valve element, so that the valve element can move freely. However, it is limited in size so that there cannot be excessive liquid here. This improves the operating behavior of the vent valve device.
  • valve element when the valve element rests on the first valve seat, the valve element essentially ends at a distance from the first valve seat at which the second valve seat begins.
  • the distance that the valve element can travel between the first valve seat and the second valve seat is thus limited to the sum of the immersion depths of the valve element in the two valve seats. In this way you can achieve a very sensitive control of the vent valve. Only a very small gap remains between the valve element and the second valve seat. This gap is slightly reduced when the valve element lifts off the first valve seat. It is then only so large that, although gases can flow out without problems, liquids flowing past the valve element exert such great forces on the valve element that it is pressed practically directly against the second valve seat.
  • At least the first valve seat advantageously has a chamfer, which forms a contact surface for the valve element. With such a chamfer, the valve element can be better received and centered. This improves the tightness of the anti-suckback valve.
  • At least the second valve seat has a broken edge with a predetermined roughness. This prevents the valve element from sticking to the second valve seat. This could a back suction of air or gas from the outside can be prevented. However, the gas volume enclosed between the first and the second valve seat could get back into the pump chamber during a suction stroke, which should be prevented.
  • the valve element preferably has a predetermined surface roughness and / or a predetermined roundness. These measures can also help to prevent the valve element from sticking, in particular to the second valve seat.
  • the anti-suckback valve therefore always closes with great reliability as soon as the flow through the vent valve device is ended. There is no need for backflow to occur.
  • the first and the second valve seat are preferably formed in valve seat elements which are identical to one another. This simplifies production and spare parts inventory. In principle, the same components can be used both for the vent valve and for the back suction protection valve.
  • a return line is connected to the vent valve device, which returns the liquid emerging from the vent valve device directly. No liquid can therefore be present at the outlet of the vent valve device, which could lead to a change in the closing or opening behavior of the vent valve device. Any liquid that escapes in one way or another when venting is drained off immediately. This is particularly advantageous in the case of toxic or aggressive liquids because there is no longer a need for a longer exposure time to areas of the pump behind the vent valve device.
  • the valve element advantageously has a specific weight that is greater than that of the liquid to be metered. If the difference is not too great, the valve element is then pressed against the second valve seat even with a smaller flow of the liquid. The vent valve is now closed. If the valve element has a larger specific weight - and thus a higher weight with the same size - you can also reliably vent liquids with a higher viscosity, which is usually associated with a higher specific weight.
  • a liquid metering pump 1 has a pump chamber 2 which is delimited by a housing 3 and a membrane 4. Instead of the membrane 4, a piston can also be used.
  • the membrane 4 is moved back and forth via an actuating rod 5 by a drive, not shown.
  • the pressure stroke When moving to the left, the volume of the pump chamber 2 decreases. Such a movement is referred to below as the pressure stroke.
  • the diaphragm 4 moves to the right, the volume of the pump chamber 2 increases. Such a movement is referred to below as a suction stroke.
  • An inlet connection 6 opens into the pump chamber 2 and can be connected via a screw connection 7 to a supply line (not shown in more detail).
  • an inlet valve 8 is arranged, which is designed as a gravity-operated check valve.
  • the valve body shown as a ball is lifted from its seat and clears the way from the inlet connection 6 into the pump chamber 2.
  • the ball is pressed onto the valve seat and prevents the fluid in the pump chamber 2 from escaping into the inlet connection 6.
  • the pump chamber is also connected to an outlet connection 9, which can be connected via a screw connector 10 to a metering line (not shown) .
  • An outlet valve 11 is arranged between the outlet connection 9 and the pump chamber 2 and opens against the force of a spring 12 in the outlet direction.
  • the spring 12 defines an opening pressure. The outlet valve 11 opens only when the opening pressure is exceeded. When the opening pressure in the pump chamber 2 falls below this, it closes again.
  • a ventilation channel 13 leaves the pump chamber 2.
  • the ventilation channel 13 leads to a ventilation valve device 14.
  • the ventilation valve device 14 has a valve housing 15, which has a first valve seat 16 at its end facing the ventilation channel 13 and a second valve valve at its other end Has valve seat 17.
  • the two valve seats 16, 17 are identical to one another. They are inserted into the valve housing from opposite sides.
  • a ball 18 is freely movable as a valve element.
  • the first valve seat 16 together with the ball forms a back suction valve.
  • the second valve seat 17 forms the actual vent valve with the ball.
  • An interior space 20 of the valve housing 15 is available to the ball 18 as the movement space Available. The valve housing 15 thus limits both the movements of the ball transverse to the direction of flow and - with the help of the two valve seats 16, 17 - in the direction of flow.
  • Both the ball 18 and the valve seats 16, 17 can consist of metals, in particular non-ferrous metals, plastics or elastomers. However, ceramic is preferably used, since there is high chemical resistance combined with high wear resistance.
  • the interior 20 tapers in the direction of the second valve seat 17. Since it is important for the function of the vent valve device 14 that it, and thus also the second valve seat 17, is arranged approximately at the uppermost position as seen in the direction of gravity, the tapering results in gases flowing through 21 the possibility of escaping from the valve device 14 without accumulation of dead spaces.
  • Both the first valve seat 16 and the second valve seat 17 have a chamfer 22.
  • This chamfer 22 forms a contact surface for the ball 18. Since the ball 18 is not precisely guided, that is to say can move transversely to the direction of flow, the chamfer 22 facilitates the centering of the ball when it contacts the respective valve seat 16, 17.
  • the edge 23 having the chamfer 22 can be broken and have a defined roughness in order to prevent the ball 18 from sticking to the second valve seat 17.
  • the ball 18 itself can also have a defined roughness 18 on its surface in order to prevent sticking to one of the two valve seats 16, 17.
  • the volume of the interior 20 is about 1.5 to about 2.5 times as large as the volume of the ball 18.
  • the distance between the first valve seat 16 and the second valve seat 17 is selected so that the ball 18 in contact with the first Valve seat 16 ends approximately where the second valve seat 17 begins. This is shown in Fig. 2 of the drawing.
  • the movement path of the ball 18 between the first valve seat 16 and the second valve seat 17 is then only as large as it corresponds to the sum of the two "immersion depths" of the ball 18 in the respective valve seats 16, 17.
  • a gap 24 between the ball 18 and the second valve seat 17 can be kept relatively small. As soon as fluid flows through the valve housing 15, this gap 24 is narrowed anyway in that the ball 18 lifts off from the first valve seat 16.
  • a drain chamber 25 connects to the valve housing 15, from which a return line 19 extends.
  • the return line 19 is arranged here so that practically no liquid can accumulate in the drain space 15. Any liquid that passes through the valve housing 15 flows practically directly through the return line.
  • vent valve device 40 can be briefly outlined as follows: During a pressure stroke of the membrane 4, gas that is located in the pump chamber 2 is compressed. Because of the high compressibility of the gas, the pressure in the pump chamber 2 will never rise so high that it can exceed the closing force of the spring 12 of the outlet valve 11.
  • the gas always collects at the highest accessible point due to the gravitational conditions. Since the ventilation duct 13 branches off from the pump chamber 2 in the uppermost point (seen in the direction of gravity), this becomes Gas accumulate in the vent duct. In the event of a pressure stroke of the membrane 4, a pressure increase in the ventilation channel 13 is created and thus a force on the ball 18 in the direction of the second valve seat 17. The ball is lifted by the first valve seat 16 under the effect of this force. There is a gap between the ball 18 and the first valve seat 16. The compressed gas flows around the ball 18 and escapes through the gap 24 between the ball 18 and the second valve seat 17.
  • the pump chamber 2 If the pump chamber 2 is completely filled with liquid, the ball 18 is lifted out of the first valve seat 16 during the pressure stroke. A partial flow of the liquid is conveyed out and flows off via the return line 19. However, this partial flow is relatively small. In the best case, it can even be made almost zero.
  • the liquid present in the venting channel 13 presses the ball 18 very quickly against the second valve seat 17.
  • the venting valve device 14 is thus closed. After a further movement of the membrane 4 in the pressure stroke, the pressure in the pump chamber 2 can then rise. It exceeds the opening pressure of the spring 12 in the outlet valve 11. The liquid can now be dispensed in doses.
  • the pressure stroke ends ie before the start of the suction stroke, the ball 18 falls back into the first valve seat 16 due to its own weight.
  • the weight of the ball 18 can be adjusted accordingly. If a ball with a higher weight is used, liquids with a higher viscosity can also be vented. In general it can be said that the specific weight of the ball, i.e. its own weight divided by its volume, should be in the range of the specific weight of the liquid to be dosed. The specific weight can also be slightly larger or slightly lower. The flow forces required to move the ball 18 are then relatively low.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Reciprocating Pumps (AREA)
  • Loading And Unloading Of Fuel Tanks Or Ships (AREA)
  • Jet Pumps And Other Pumps (AREA)

Claims (14)

  1. Pompe de dosage de liquide comportant une chambre de pompe dont le volume augmente lors d'une course d'aspiration et diminue lors d'une course de refoulement et sur l'extrémité supérieure de laquelle est disposé un dispositif de soupape de désaération qui comporte une soupape de désaération activée par un écoulement et dont le comportement de réponse est déterminé par l'état d'agrégation du fluide circulant, caractérisée en ce qu'en amont de la soupape de désaération (17,18) dans la direction d'écoulement sortant de la chambre (2) de la pompe est montée une soupape de protection contre une aspiration rétrograde (16,18) dont l'élément de soupape possède un poids spécifique qui se situe au voisinage du poids spécifique du liquide à doser.
  2. Pompe selon la revendication 1, caractérisée en ce que la soupape de protection contre une aspiration rétrograde (16,18) se ferme en l'absence d'un écoulement rétrograde et s'ouvre uniquement dans le cas d'un écoulement de fluide hors de la chambre (2) de la pompe.
  3. Pompe selon la revendication 1 ou 2, caractérisée en ce que la soupape de désaération (17,18) et la soupape de protection contre une aspiration rétrograde (16,18) possèdent un élément de soupape commun (18).
  4. Pompe selon la revendication 3, caractérisée en ce que l'élément de soupape (18) est librement mobile entre un premier siège de soupape (16) qui fait partie de la soupape de protection contre une aspiration rétrograde (16,18) et un second siège de soupape (17) qui fait partie de la soupape de désaération (17,18), un écoulement dans le dispositif de soupape de désaération (14) étant possible uniquement lorsque l'élément de soupape (18) est dans une position située entre les premier et second sièges de soupape (17,18).
  5. Pompe selon la revendication 3 ou 4, caractérisée en ce que l'élément de soupape (18) est agencé sous la forme d'une bille.
  6. Pompe selon l'une des revendications 3 à 5, caractérisée en ce que le dispositif de soupape de désaération (14) comporte un boîtier de soupape (15) possédant un espace intérieur (20) dans lequel est disposé l'élément de soupape (18) et qui se rétrécit en direction du second siège de soupape (17) disposé au niveau de la sortie de l'élément de soupape.
  7. Pompe selon la revendication 6, caractérisée en ce que le volume de la chambre intérieure (20) est compris entre 1,5 et 3 fois le volume de l'élément de soupape (18).
  8. Pompe selon l'une des revendications 3 à 7, caractérisée en ce que, lors de l'application de l'élément de soupape (18) contre un siège de soupape (16), l'élément de soupape (18) se termine essentiellement dans une position distante du premier siège de soupape (16) au niveau de laquelle commence le second siège de soupape (17).
  9. Pompe selon l'une des revendications 3 à 8, caractérisée en ce qu'au moins le premier siège de soupape (16) possède un biseau (22) qui forme une surface d'application pour l'élément de soupape (18).
  10. Pompe selon l'une des revendications 3 à 9, caractérisée en ce qu'au moins le second siège de soupape (17) possède un bord à pan coupé (23) présentant une rugosité prédéterminée.
  11. Pompe selon l'une des revendications 3 à 10, caractérisée en ce que l'élément de soupape (18) possède une rugosité de surface prédéterminée et/ou un arrondi prédéterminé.
  12. Pompe selon l'une des revendications 3 à 11, caractérisée en ce que les premier et second sièges de soupape (16,17) sont formés dans des éléments de sièges de soupape qui sont identiques.
  13. Pompe selon l'une des revendications 1 à 12, caractérisée en ce qu'au dispositif de soupape de désaération (14) est raccordée une canalisation de retour (19) qui évacue directement du liquide qui sort du dispositif de soupape de désaération (14).
  14. Pompe selon l'une des revendications 3 à 13, caractérisée en ce que l'élément de soupape (18) possède un poids spécifique qui est supérieur au liquide à doser.
EP95106393A 1994-05-26 1995-04-28 Pompe doseuse de fluides Expired - Lifetime EP0684383B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4418314A DE4418314C1 (de) 1994-05-26 1994-05-26 Flüssigkeitsdosierpumpe
DE4418314 1994-05-26

Publications (2)

Publication Number Publication Date
EP0684383A1 EP0684383A1 (fr) 1995-11-29
EP0684383B1 true EP0684383B1 (fr) 1997-02-19

Family

ID=6518977

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95106393A Expired - Lifetime EP0684383B1 (fr) 1994-05-26 1995-04-28 Pompe doseuse de fluides

Country Status (4)

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EP (1) EP0684383B1 (fr)
JP (1) JPH07317665A (fr)
AT (1) ATE149057T1 (fr)
DE (2) DE4418314C1 (fr)

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP4439689B2 (ja) * 2000-07-14 2010-03-24 株式会社テイエルブイ 排気弁
CN101865126B (zh) * 2010-06-25 2012-03-21 罗献尧 一种小流量泵头
JP6726956B2 (ja) * 2015-12-07 2020-07-22 株式会社イワキ 往復動ポンプ及びガス抜き弁のバルブ構造

Family Cites Families (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2543828A (en) * 1949-03-30 1951-03-06 Standard Oil Dev Co Device for controlling the injection of fluids
CH390686A (de) * 1959-12-04 1965-04-15 Eckerle Otto Förderpumpenanlage
JPS4926721Y1 (fr) * 1972-11-21 1974-07-19
US4104004A (en) * 1976-11-12 1978-08-01 The De Laval Separator Company Air eliminator for pumps
JPS58108285U (ja) * 1982-10-27 1983-07-23 日機装株式会社 往復動ポンプ
JPS59139590U (ja) * 1983-03-07 1984-09-18 三浦工業株式会社 小形プランジヤ−ポンプ
JPS60256572A (ja) * 1984-05-22 1985-12-18 Nitsukisou Eiko Kk 自動ガス抜き機構を備えた往復動ポンプ
JPS6111473A (ja) * 1984-06-27 1986-01-18 Nitsukisou Eiko Kk 往復動ポンプにおける自動ガス抜き装置
DE4219663C2 (de) * 1992-06-16 1996-01-18 Prominent Dosiertechnik Gmbh Flüssigkeits-Dosierpumpe
DE4241030C1 (de) * 1992-12-05 1994-06-01 Lang Apparatebau Gmbh Dosierpumpe mit Entlüftungsventil

Also Published As

Publication number Publication date
DE59500111D1 (de) 1997-03-27
DE4418314C1 (de) 1996-01-04
JPH07317665A (ja) 1995-12-05
ATE149057T1 (de) 1997-03-15
EP0684383A1 (fr) 1995-11-29

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