EP2025937A1 - Kolbenpumpe - Google Patents

Kolbenpumpe Download PDF

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Publication number
EP2025937A1
EP2025937A1 EP07425514A EP07425514A EP2025937A1 EP 2025937 A1 EP2025937 A1 EP 2025937A1 EP 07425514 A EP07425514 A EP 07425514A EP 07425514 A EP07425514 A EP 07425514A EP 2025937 A1 EP2025937 A1 EP 2025937A1
Authority
EP
European Patent Office
Prior art keywords
chamber
fluid
pump
pumping
recirculating
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
EP07425514A
Other languages
English (en)
French (fr)
Other versions
EP2025937B1 (de
Inventor
Marco Soldo
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.)
Three Es Srl
Original Assignee
Three Es Srl
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 Three Es Srl filed Critical Three Es Srl
Priority to EP07425514A priority Critical patent/EP2025937B1/de
Priority to DE602007007325T priority patent/DE602007007325D1/de
Priority to AT07425514T priority patent/ATE472058T1/de
Publication of EP2025937A1 publication Critical patent/EP2025937A1/de
Application granted granted Critical
Publication of EP2025937B1 publication Critical patent/EP2025937B1/de
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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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
    • F04B53/08—Cooling; Heating; Preventing freezing
    • 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
    • F04B5/00—Machines or pumps with differential-surface pistons
    • 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
    • F04B53/16—Casings; Cylinders; Cylinder liners or heads; Fluid connections
    • F04B53/162—Adaptations of cylinders
    • F04B53/164—Stoffing boxes
    • 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
    • F04B53/18—Lubricating

Definitions

  • the present invention relates to a reciprocating pump in accordance with the preamble of claim 1.
  • a prior art reciprocating pump typically comprises a crankshaft housing, a pump housing, a pumping chamber and a recovery chamber within the pump housing, a reciprocating member mounted in the pump housing and extending from the crankshaft housing to the pumping chamber across the recovery chamber, high pressure seal means between the pumping chamber and the recovery chamber, low pressure seal means between the intermediate chamber and the crankshaft housing and a pumping circuit.
  • the pumping circuit comprises a suction chamber and a delivery chamber in fluid communication with the pumping chamber through interposed valve means, and the recovery chamber in fluid communication with the suction chamber of the pumping circuit, through the high pressure seal.
  • seals are not only exposed to cavitation problems, but also to feed line variables, such as temperature, specific weight, diameter and length of the line and, last but not least, pressure of the fluid to be pressurized, wherefore they are the first components to be replaced.
  • feed line variables such as temperature, specific weight, diameter and length of the line and, last but not least, pressure of the fluid to be pressurized, wherefore they are the first components to be replaced.
  • the deterioration of these seals results in leakages of pumping circuit fluid outside the pump, partly on the ground, possibly causing damages to other underlying members and/or pollution of pump surroundings, and partly, due to the motion of the piston stem, into the mechanical transmission case, thereby polluting the lubricant and consequently causing damages to the transmission members.
  • US 2006/0140778 discloses a reciprocating pump comprising a crankshaft housing, a pump housing, a pumping chamber and an intermediate chamber within the pump housing, a reciprocating member mounted in the pump housing and extending from the crankshaft housing to the pumping chamber across the intermediate chamber, high pressure seal means between the pumping chamber and the intermediate chamber, low pressure seal means between the intermediate chamber and the crankshaft housing, a pumping circuit and an auxiliary lubricating and cooling circuit.
  • the pumping circuit comprises a suction chamber and a delivery chamber in fluid communication with the pumping chamber through interposed valve means, and the auxiliary circuit comprises a suction chamber and a delivery chamber in fluid communication with the intermediate chamber.
  • the pumping circuit i.e. the suction chamber of the pumping circuit is in fluid separation from the auxiliary flushing circuit.
  • the reciprocating pump of the prior art as described above avoids pulsed stresses on the low pressure seal by the liquid in the suction chamber and allows the high pressure seal to maintain its hydraulic efficiency for a longer time than the high pressure seal.
  • the characterizing feature of the reciprocating pump as disclosed in US 2006/0140778 i.e. that the suction chamber of the auxiliary circuit is connected to a running water source and the delivery chamber of the auxiliary circuit discharges to a running water destination, involves considerable water consumption during pump operation and prevents the use of additives in the auxiliary circuit.
  • the pump shall have a series of members, such as check valves, adjustment valves and switchboards for controlling and checking the auxiliary circuit.
  • any hydraulic inefficiency of the high pressure seal may cause such fluid to contact the water of the auxiliary flushing circuit.
  • Contamination of the auxiliary flushing circuit water by the fluid of the pumping circuit requires disposal of the whole amount of water that is used for flushing low pressure seals as a pollutant. It shall be further considered that the amount of contaminant to be used depends on the efficiency of high pressure seals, which is difficult to estimate. Even when the chemico-phyisical characteristics of the flushing water are suitable for it to be discharged, it still has to be noted it is present in non-negligible amounts and that water will be increasingly considered as a valued asset to be preserved.
  • the flushing circuit has to operate at the same time as the pump with which it associated and that it has to be equipped with accessories such as check and/or adjustment valves, switchboard, instrumentation, etc. to ensure efficiency and reliability. If these components are not supplied and installed with the pump, they involve additional work during pump installation and are also usually considered of secondary importance, therefore they may turn to be inadequate and/or unreliable and thwart the flushing benefits. It shall be further considered that the water source for the recirculating circuit may have various characteristics depending on the installation site, and parameters such as temperature, pressure, hardness, salinity may have the effect of reducing flushing efficiency or even cause problems to seals (e.g. limestone deposits).
  • the object of this invention is to provide a reciprocating pump that has such structural and functional features as to fulfill the above need, while obviating the drawbacks of prior art.
  • the fluid of the auxiliary circuit may be recirculated.
  • numeral 1 generally designates a reciprocating pump of the present invention.
  • the pump 1 comprises a crankshaft housing 10 and a pump housing 20.
  • the crankshaft housing 10 has a crankshaft 11 mounted therein which is externally driven, e.g. by the motor 12.
  • the pump housing 20 comprises a pumping chamber 30, an intermediate chamber 40 and a reciprocating member 50 mounted in the pump housing 20 and extending from the crankshaft housing 10 to the pumping chamber 30 across the intermediate chamber 40.
  • the reciprocating member 50 i.e. a piston or a plunger, is linked by a connecting rod 51 to the crankshaft 11 mounted in the crankshaft housing 10.
  • Oil seal means 13 are provided for containing the oil for lubrication of the mechanical transmission elements within the crankshaft housing 10.
  • the pump 1 further has high pressure seal means 21 between the pumping chamber 30 and the intermediate chamber 40, and low pressure seal means 22 between the intermediate chamber 40 and the crankshaft housing 10.
  • the pump 1 further has a pumping circuit 60 comprising a first suction chamber 61, a first delivery chamber 62 and the pumping chamber 30, where the first suction chamber 61 and the first delivery chamber 32 are in fluid communication with the pumping chamber 30 through respective interposed valve means 63, 64.
  • the pump 1 further has an auxiliary circuit 70 comprising a second suction chamber 71, a second delivery chamber 72 and an intermediate chamber 40, where the second suction chamber 71 and the second delivery chamber 72 are in fluid communication with the intermediate chamber 40.
  • the pump 1 further has a discharge line 31 connected to a tank 32 for collecting the waste liquid leaking from the low pressure sealing means 22.
  • the intermediate chamber 40 of the auxiliary circuit 70 is isolated from the suction chamber 61 of the pumping circuit 60, so that the pumping circuit 60 is in fluid separation from the auxiliary circuit 70.
  • Isolation of the auxiliary circuit 70 from the pumping circuit 60 can be achieved both on new generation pumps and on existing (retrofit) pumps.
  • the pumping circuit is separated from the auxiliary circuit by specially designing the body of the pump housing.
  • the fluid communication channel between the two pump and auxiliary circuits may be interrupted by a plug or a non-return valve. This will be discussed in greater detail hereinbelow with reference to an embodiment of the invention.
  • the reciprocating pump 1 further comprises a recirculating unit 80 whose inlet is connected to the second delivery chamber 72 and whose outlet is connected to the second suction chamber 71 of the auxiliary circuit 70.
  • the recirculating unit 80 comprises a recirculating pump 81 which is designed to suck fluid from the delivery chamber 72 and pump such fluid in the second suction chamber 71 for fluid recirculating in the auxiliary circuit 70.
  • this allows the use of fluids, in the auxiliary flushing circuit, that can compensate, support, withstand and oppose the detrimental action that the fluid of the pumping circuit would have on low pressure seals, thereby further involving advantages for high pressure seals, allows to make pumps with a dedicated auxiliary flushing circuit for any specific application, regardless of any external factors, avoids any need for disposal of flushing liquid as a polluting liquid, avoids the need to check the pressure, quality, quantity and characteristics of the flushing fluid, and also avoids any lubrication inefficiency risk within the flushing circuit. It shall be further noted that the possibility of adding lubricant in the auxiliary flushing circuit 70 can not only increase the mechanical wear resistance of low pressure seals 22 but also to control natural hydraulic inefficiencies of high pressure seals 21.
  • the recirculating pump 81 is connected to the crankshaft 11 of the pump 1 so that the recirculating pump 81 can be rotatably driven by the rotation of the crankshaft 11 of the pump 1.
  • This allows omission of many flushing circuit check and control members, check valves, electric control circuits, as well as the control instrumentation required to control and check the flushing functions, because flushing is started at the same time as the pump.
  • the recirculating pump 81 requires no electrical drive arrangement, as it is driven by the rotation provided by the crankshaft 11 of the reciprocating pump 1.
  • the recirculating pump 81 can be provided with actuating means so that it is not connected to the crankshaft 11 of the reciprocating pump 1.
  • the recirculating unit 80 has heat exchanger means 82 connected at their inlet to the second delivery chamber 72 and at their outlet to the recirculating pump 81.
  • the fluid sucker by the delivery chamber 72 and heated as it passes through the intermediate chamber 40 and the seals 21, 22 is cooled by the heat exchanger means 82, such as a radiator, and pumped into the suction chamber 71 by the recirculating pump 81.
  • the pumping circuit 30 is designed to pump water, aqueous solutions or fluid mixtures.
  • the recirculating unit 80 is also designed to recirculate water in the auxiliary circuit 70.
  • the provision of the heat exchanger means 82 allows the recirculated fluid to be considerably cooled, wherefore the reciprocating pump 1 can operate at temperatures close to the boiling temperature of the pumped fluid.
  • the recirculating unit 80 has fan means 84 for forced ventilation of the heat exchanger 82 and an evaporation tank 83 for collecting fluid leakages due to normal efficiency losses of the high pressure seal 21.
  • the evaporation tank 83 may be connected to the tank 32 for collecting liquid leakages from low pressure seals 22.
  • the fan means 84 are connected to the crankshaft 11 so that the rotation of the crankshaft 11 is transmitted to the fan means 84.
  • the rotation of the crankshaft 11 is utilized, wherefore the fan means 84 require no electric drive arrangement or electronic control system.
  • the recirculating unit 80 comprises a compensation tank 85 having an overpressure valve 86, and connected to the outlet of the heat exchanger means 82.
  • a part of the liquid of the pumping circuit 60 leaks from the pumping chamber 30, through the high pressure seal 21, into the intermediate chamber 40, such excess liquid is eliminated by the overpressure valve 86 to restore the correct pressure in the auxiliary circuit 70.
  • the excess liquid is eliminated by the forced ventilation operation of the fan means 84.
  • the fan means 84 operate by forced ventilation to cause evaporation of the liquid contained in the evaporation tank 83. If the fan means 84 cannot fully evaporate the liquid contained in the evaporation tank 83, then such excess liquid is eliminated through the tank 32 for collecting the liquids leaking from the low pressure seals 22.
  • a sensor 34 may be further provided at the leaking liquid tank 32 to check for the presence of fluid that has not been evaporated by the heat exchanger 82.
  • the recirculating unit 80 has a lubricant tank 87 connected to the recirculating pump 81 for the lubricant to be pumped into the auxiliary circuit 70.
  • a lubricant tank 87 connected to the recirculating pump 81 for the lubricant to be pumped into the auxiliary circuit 70.
  • the pumping circuit 60 may be also designed to pump a liquid other than the liquid to be recirculated in the auxiliary circuit 70 through the recirculating unit 80.
  • the liquid of the auxiliary circuit 70 is compatible with the liquid of the pumping circuit 60 when mixed therewith, the leaking liquid may be reintroduced in the pumping circuit 60.
  • the auxiliary circuit 70 communicates with the pumping circuit 60, particularly with the suction chamber 61, through a one-way valve or non-return valve 65, which is contained in a line 66 for connection of the suction chamber 61 with the suction chamber 71.
  • the non-return valve 65 allows fluid to flow from the auxiliary circuit 70 to the pumping circuit 60 when fluid pressure in the auxiliary circuit 70 exceeds a predetermined threshold, e.g. due to leakages from the high pressure seal 21, so that pressure in the intermediate chamber 40 can be maintained within the maximum limits of the low pressure seal means 22.
  • the pump 1 has a recovery chamber 41 between the pumping chamber 30 and the intermediate chamber 40 as well as intermediate seal means 23 between the high pressure seal means 21 and the low pressure seal means 22.
  • the high pressure seal means 21 are located between the pumping chamber 30 and the recovery chamber 41
  • the intermediate seal means 23 are located between the recovery chamber 41 and the intermediate chamber 40
  • the low pressure seal means 22 are located between the intermediate chamber 40 and the crankshaft housing 10.
  • the recovery chamber 41 is connected through the connection line 66 and the non-return valve 65 to the suction chamber 61 of the pumping circuit 60.
  • the fluid of the pumping circuit 60 leaks into the recovery chamber 41 from the pumping chamber 30. Thanks to the provision of the intermediate seal means 23, such leaking liquid is recovered without being contaminated by the fluid of the auxiliary circuit 70 and may be reintroduced into the pumping circuit 60 through the connection line 66, as the non-return valve 65 is opened, which valve is appropriately calibrated to maintain the pressure in the auxiliary circuit 70 at preset levels, i.e. to maintain pressure in the intermediate chamber 40 within the maximum limits of the low pressure seals 22.
  • the reciprocating pump of the present invention fulfills the above mentioned needs and also obviates prior art drawbacks as set out in the introduction of this disclosure.
  • the reciprocating pump of the present invention is structurally simpler and can avoid any flushing liquid waste.
  • the fluid of the auxiliary circuit may be recirculated.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Details Of Reciprocating Pumps (AREA)
  • Steroid Compounds (AREA)
EP07425514A 2007-08-07 2007-08-07 Kolbenpumpe Not-in-force EP2025937B1 (de)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP07425514A EP2025937B1 (de) 2007-08-07 2007-08-07 Kolbenpumpe
DE602007007325T DE602007007325D1 (de) 2007-08-07 2007-08-07 Kolbenpumpe
AT07425514T ATE472058T1 (de) 2007-08-07 2007-08-07 Kolbenpumpe

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP07425514A EP2025937B1 (de) 2007-08-07 2007-08-07 Kolbenpumpe

Publications (2)

Publication Number Publication Date
EP2025937A1 true EP2025937A1 (de) 2009-02-18
EP2025937B1 EP2025937B1 (de) 2010-06-23

Family

ID=38698206

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07425514A Not-in-force EP2025937B1 (de) 2007-08-07 2007-08-07 Kolbenpumpe

Country Status (3)

Country Link
EP (1) EP2025937B1 (de)
AT (1) ATE472058T1 (de)
DE (1) DE602007007325D1 (de)

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3267035A1 (de) * 2016-07-07 2018-01-10 Cameron International Corporation Schlammpumpendichtungsanordnung
US10246955B2 (en) 2016-07-07 2019-04-02 Cameron International Corporation Self-aligning mud pump assembly
US10280910B2 (en) 2016-07-07 2019-05-07 Cameron International Corporation Load-balanced mud pump assembly
IT201800006145A1 (it) * 2018-06-08 2019-12-08 Pompa volumetrica a pistoni
CN113638876A (zh) * 2021-09-23 2021-11-12 黄秀芳 一种往复泵节约润滑油数量的机架结构

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379033A (en) 1966-08-10 1968-04-23 Vilter Manufacturing Corp Refrigeration system and apparatus
EP0976993A2 (de) 1998-07-27 2000-02-02 EMBRACO EUROPE S.r.l. Motorverdichter für Kältegerät und Kältegerät mit solchem Motorverdichter
US20060140778A1 (en) * 2004-12-28 2006-06-29 Warren Leslie J Reciprocating positive displacement pump for deionized water and method of cooling and lubricating therefor

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3379033A (en) 1966-08-10 1968-04-23 Vilter Manufacturing Corp Refrigeration system and apparatus
EP0976993A2 (de) 1998-07-27 2000-02-02 EMBRACO EUROPE S.r.l. Motorverdichter für Kältegerät und Kältegerät mit solchem Motorverdichter
US20060140778A1 (en) * 2004-12-28 2006-06-29 Warren Leslie J Reciprocating positive displacement pump for deionized water and method of cooling and lubricating therefor

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3267035A1 (de) * 2016-07-07 2018-01-10 Cameron International Corporation Schlammpumpendichtungsanordnung
US20180010601A1 (en) * 2016-07-07 2018-01-11 Cameron International Corporation Mud pump sealing assembly
US10246955B2 (en) 2016-07-07 2019-04-02 Cameron International Corporation Self-aligning mud pump assembly
US10280910B2 (en) 2016-07-07 2019-05-07 Cameron International Corporation Load-balanced mud pump assembly
US10612536B2 (en) * 2016-07-07 2020-04-07 Cameron International Corporation Mud pump sealing assembly
IT201800006145A1 (it) * 2018-06-08 2019-12-08 Pompa volumetrica a pistoni
EP3578811A1 (de) * 2018-06-08 2019-12-11 Annovi Reverberi S.p.A. Volumetrische kolbenpumpe
CN113638876A (zh) * 2021-09-23 2021-11-12 黄秀芳 一种往复泵节约润滑油数量的机架结构

Also Published As

Publication number Publication date
ATE472058T1 (de) 2010-07-15
DE602007007325D1 (de) 2010-08-05
EP2025937B1 (de) 2010-06-23

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