EP3308019A1 - Reciprocating piston pump with input-side flow rate limitation - Google Patents
Reciprocating piston pump with input-side flow rate limitationInfo
- Publication number
- EP3308019A1 EP3308019A1 EP16739020.2A EP16739020A EP3308019A1 EP 3308019 A1 EP3308019 A1 EP 3308019A1 EP 16739020 A EP16739020 A EP 16739020A EP 3308019 A1 EP3308019 A1 EP 3308019A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- throttle
- piston
- reciprocating pump
- filter
- inlet
- 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
-
- 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
- F04B17/00—Pumps characterised by combination with, or adaptation to, specific driving engines or motors
- F04B17/03—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors
- F04B17/04—Pumps characterised by combination with, or adaptation to, specific driving engines or motors driven by electric motors using solenoids
-
- 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
- F04B1/00—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders
- F04B1/04—Multi-cylinder machines or pumps characterised by number or arrangement of cylinders having cylinders in star- or fan-arrangement
- F04B1/0404—Details or component parts
- F04B1/0452—Distribution members, e.g. valves
Definitions
- the invention relates to a reciprocating pump according to the preamble of the first claim.
- the reciprocating pump has in particular an input-side flow limitation.
- Reciprocating pumps with electromagnetic drive are known, for example from the publications DE 4328621 A1 and DE 10 2008 055 609 B4
- Blockage of the cross-section with particles in the liquid threatens.
- An inexpensive reciprocating pump is an input side
- the reciprocating pump is an electromagnetically driven pump with two displacement chambers, which is flowed through by the liquid to be delivered.
- the flow rate of the reciprocating pump is limited according to this invention by a throttle or orifice.
- a pressure may be present, which is higher than the maximum value of the pressure in the input-side first displacement chamber for trouble-free operation of the reciprocating pump.
- the said throttle is also used to lower the pressure in the first displacement chamber to a permissible level, when the theoretical flow rate of the pump, which is equal to the product of the stroke volume of the single stroke and the frequency, is greater than the inflow through the throttle , In this working state of the pump, the real flow rate is also smaller than said product, the reciprocating pump gets even further in the state of a cavitation induced flow reduction, because not enough liquid flows in the suction in the second displacement. The cavitation does not cause any damage in this case because the pressure is low.
- the throttle ultimately determines the flow rate of the reciprocating pump.
- the throttle In the case of the pump stall, the throttle is closed by a spring, which also returns the piston of the pump to its rest position, presses a seal by means of the piston against the throttle.
- the throttle must be at a high
- Pressure in said housing have a very small effective diameter.
- Chokes with a very small effective diameter tend to block because every technical fluid contains particles that have not been filtered out by an upstream filter.
- the shock wave is on the one hand by the striking and on the other hand by a
- a movable insert throttle is used is displaced against a spring at each impact of the piston and its movement prevents the blockage.
- a pressure relief valve in the piston of the reciprocating pump is optionally provided, which limits the pressure difference between the first and the second displacement to a value that is only so high that the function of the reciprocating pump always secured remains.
- the reciprocating pump is operated at the start of its operation with a higher than usual voltage.
- the reciprocating piston pump according to the invention is used for draining or sucking off liquid from a filter housing, a water separator or from another container, preferably to diesel engines in
- Fig. 1 shows the reciprocating piston pump according to the invention with the piston in
- Fig. 2 shows a variant of the reciprocating pump with screwed throttle.
- Fig. 3 shows a variant of the reciprocating pump, which is screwed to a filter housing.
- Fig. 4 shows a variant of the throttle in detail.
- the reciprocating pump (1) according to FIG. 1 is replaced by a
- Electromagnet (2) driven, which acts against a return spring (11).
- the reciprocating pump includes two displacement chambers (3, 4), which are separated by a piston (5) moved by the electromagnet, and a
- Overflow valve device (6) for connecting the two displacement chambers with each other and an outlet valve (7).
- the first displacement chamber (3) is connected to an inlet (9) through a throttle (8), the throttle (8) being closed by a seal (24) connected to the piston (5) when the piston (5) moves in its
- the stroke of the piston (5) is designed so that the piston (5) by means of the seal (24) on the throttle (8) strikes when in the non-driven state of the electromagnet (2), the return spring the piston (5) in its rest position brings.
- the effective inner diameter D of the throttle (8) is designed so that in the case of one of the electromagnet (2) caused working stroke of the piston (5) from the second displacement chamber (4) geometrie employment the outlet
- displaceable liquid volume is greater than the volume which flows simultaneously into the first displacement chamber (3) due to the pressure difference between the inlet (9) and the first displacement chamber (3) through the throttle (8) during the working cycle of the piston (5).
- the flow rate of the reciprocating pump from the throttle (8) and not by the displacement effect of the piston (5) is limited, and in the first displacement chamber (3) sets a pressure that is considerably lower than the pressure at the inlet, for example, less than 1 bar.
- the throttle (8) has, for example, an effective inner diameter D which is greater than or equal to 0.1 mm and less than or equal to 1 mm.
- the length of the throttle bore (12) is preferably less than or equal to 50 * D and greater than or equal to 5 * D, so that predominantly laminar flow is achieved in the throttle.
- a shutter is used which has a bore length shorter than D.
- a filter (10) with a nominal filter fineness of less than D / 4 upstream of the throttle (8) is provided.
- the filter (10) in a housing part (13) of the reciprocating pump is arranged so that the pumped liquid on the way from the inlet (9) to the throttle (8) must pass completely through the filter.
- the filter (10) outside the housing part (13) of the reciprocating pump in a filter housing (14) is arranged, is ensured by the connection of the housing of the reciprocating pump with the filter housing (14) that only such liquid to throttle ( 8), which has previously passed the filter (0).
- the throttle (8) is designed according to FIG. 2 as a screw-threaded body with a first thread, wherein the body is screwed into a second thread which is mounted in the housing part (13).
- said body is pressed into the housing part.
- the throttle (8) consists of at least two components, a sleeve (20) and an insert (21), wherein the insert (21) in the sleeve (20) is movable.
- a flow path (23) is arranged between the insert and the sleeve.
- the insert is held by its own weight or a spring (22) in its rest position and pushed by the piston (5) in a working position when the return spring (11) brings the piston in its rest position in the idle state of the electromagnet (2).
- the piston (5) includes a pressure limiting valve (26), not shown, which when exceeding a limiting pressure difference between the first displacement chamber (3) and the second displacement chamber (4) has a volume flow between the first
- the reciprocating pump according to FIG. 3 is arranged in a vertical or nearly vertical position below the filter housing (14).
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102015007464.4A DE102015007464A1 (en) | 2015-06-09 | 2015-06-09 | Reciprocating pump with inlet-side flow limitation |
PCT/EP2016/000932 WO2016198156A1 (en) | 2015-06-09 | 2016-06-06 | Reciprocating piston pump with input-side flow rate limitation |
Publications (2)
Publication Number | Publication Date |
---|---|
EP3308019A1 true EP3308019A1 (en) | 2018-04-18 |
EP3308019B1 EP3308019B1 (en) | 2019-01-23 |
Family
ID=56413610
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP16739020.2A Active EP3308019B1 (en) | 2015-06-09 | 2016-06-06 | Reciprocating piston pump with input-side flow rate limitation |
Country Status (3)
Country | Link |
---|---|
EP (1) | EP3308019B1 (en) |
DE (1) | DE102015007464A1 (en) |
WO (1) | WO2016198156A1 (en) |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR1358832A (en) * | 1963-06-06 | 1964-04-17 | Controls Co Of America | Electric pump |
CS273485B1 (en) * | 1988-10-20 | 1991-03-12 | Stanislav Kucera | Electromagnetic piston pump |
DE4328621C2 (en) | 1993-08-26 | 2002-11-28 | Thomas Magnete Gmbh | Electromagnetically operated pump, in particular metering pump |
DE102006019584B4 (en) * | 2006-04-27 | 2008-06-05 | Thomas Magnete Gmbh | metering |
DE102008055609B4 (en) | 2008-11-03 | 2011-12-29 | Thomas Magnete Gmbh | reciprocating pump |
DE102014000627B3 (en) | 2014-01-17 | 2015-05-21 | Thomas Magnete Gmbh | Dosing pump with pressure regulator for suction pressure as well as procedures for testing, adjusting and operating the dosing pump |
-
2015
- 2015-06-09 DE DE102015007464.4A patent/DE102015007464A1/en active Pending
-
2016
- 2016-06-06 EP EP16739020.2A patent/EP3308019B1/en active Active
- 2016-06-06 WO PCT/EP2016/000932 patent/WO2016198156A1/en active Application Filing
Also Published As
Publication number | Publication date |
---|---|
DE102015007464A1 (en) | 2016-12-15 |
EP3308019B1 (en) | 2019-01-23 |
WO2016198156A1 (en) | 2016-12-15 |
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