CN101021208A - Liquid pump - Google Patents

Liquid pump Download PDF

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Publication number
CN101021208A
CN101021208A CNA2006101499277A CN200610149927A CN101021208A CN 101021208 A CN101021208 A CN 101021208A CN A2006101499277 A CNA2006101499277 A CN A2006101499277A CN 200610149927 A CN200610149927 A CN 200610149927A CN 101021208 A CN101021208 A CN 101021208A
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CN
China
Prior art keywords
chamber
piston
liquid
built
equipment
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.)
Pending
Application number
CNA2006101499277A
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Chinese (zh)
Inventor
布赖恩·D·霍尔特
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.)
Campbell Hausfeld LLC
Original Assignee
Campbell Hausfeld Scott Fetzer Co
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 Campbell Hausfeld Scott Fetzer Co filed Critical Campbell Hausfeld Scott Fetzer Co
Publication of CN101021208A publication Critical patent/CN101021208A/en
Pending legal-status Critical Current

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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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/16—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by adjusting the capacity of dead spaces of working chambers
    • 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
    • F04B49/00—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00
    • F04B49/12—Control, e.g. of pump delivery, or pump pressure of, or safety measures for, machines, pumps, or pumping installations, not otherwise provided for, or of interest apart from, groups F04B1/00 - F04B47/00 by varying the length of stroke of the working members
    • F04B49/121—Lost-motion device in the driving mechanism

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Reciprocating Pumps (AREA)
  • Details Of Reciprocating Pumps (AREA)

Abstract

A housing of a pump apparatus includes an undivided cavity, an inlet valve through which liquid can enter the cavity, and an outlet valve through which the liquid can exit the cavity. A primary piston is configured to reciprocate in the cavity to draw the liquid into the cavity through the inlet valve during an intake stroke of the piston and discharge the liquid out of the cavity through the outlet valve during a delivery stroke. A reservoir structure is configured to add, to the total volume of the cavity, an extra volume that is a smooth positive function of liquid pressure in the cavity.

Description

Liquid pump
Technical field
The application relates to liquid pump.
Background technique
Liquid pump is included in the piston that moves back and forth in the cylindrical cavity.This piston is pumped into liquid in the described chamber by suction valve during aspirating stroke, by delivery valve liquid is extruded this chamber during delivery stroke.
Summary of the invention
The shell of pumping unit comprises ameristic chamber, suction valve and delivery valve, can enter into this chamber by this suction valve liquid, can flow out this chamber by this delivery valve liquid.Main piston is built in described chamber and moves back and forth, and by suction valve liquid is pumped in the described chamber during the aspirating stroke of this piston, by delivery valve liquid is discharged this chamber during delivery stroke.The whole volume that liquid reservoir structure is built into respect to this chamber increases extra volume, and this extra volume is the level and smooth positive function of the fluid pressure in this chamber.
Preferably, described liquid reservoir structure comprises secondary piston, and this secondary piston is built into by certain shift length and withdraws, and this shift length is the level and smooth positive function of described fluid pressure.The distance that described extra volume equals displacement multiply by the cross-section area of this piston.This secondary piston is along the vertical axle withdrawal of the direction that moves back and forth with described main piston.
Description of drawings
Fig. 1 is the schematic representation with pressure wash device of pump;
Fig. 2-the 4th, the part schematic sectional view of the different time points of described pump in its operating process;
Fig. 5 is the expansion sectional view of the part of described pump, has shown extention; With
Fig. 6 is the part schematic cross section with another pump of the parts similar to parts shown in Figure 2.
Embodiment
Equipment 1 shown in Figure 1 has the exemplary parts as the described element of claims.Therefore this equipment comprises that those of ordinary skill in the art can make and use the example of invention required for protection.The description of this specification is in order to satisfy the needs of implementation and preferred forms, not limit and the situation that does not have in claims to describe is not produced.
Described equipment 1 is the pressure wash device, and it comprises and being used for the pump 10 of liquid from supply lines 12 pumps to outlet line 14.This supply lines 12 has the input flexible pipe 20 that can be connected with water tap.This outlet line 14 has the delivery hose 22 that is connected with nozzle 24.This pump 10 extrudes this nozzle 24 with water from described incoming line 12 suction and with its form with the pressurized spraying.
As shown in Figure 2, described pump 10 comprises shell 30, and it is the cylindrical main chamber 32 at center that this shell 30 forms with principal axis A 1.Liquid enters described chamber 32 from supply lines 12 by inhalation check valve 34, flows out to described outlet line 14 by output safety check 36 from this chamber 32.
Described shell 30 has columniform piston and bears surface 40, and this piston bears surface 40 and forms opening 42.Cylindrical main piston 50 extends in the described chamber 32 by opening 42.This bears surface 40 and supports this piston 50 slidably, and forms fluid tight seal with this piston 50 around this piston 50.Helical spring 52 be wrapped in this piston 50 around, it is compressed between the spring supporting lip 54 of this piston 50 and the shell 30 with axial outside this piston of bias voltage.
The output shaft 60 and the described principal axis A 1 of motor 62 extend in parallel.This 60 is connected with the wobble plate 64 with slidingsurface 66, and this slidingsurface 66 promotes the axially inside bias voltages of the described spring of antagonism of described piston 50.This slidingsurface 66 tilts with respect to axle 60 so that described piston 50 with this wobble plate 64 and this rotatingshaft of 60 to moving back and forth.
Described shell 30 also has columniform secondary surfaces 70, and this secondary surfaces 70 forms the secondary chamber 72 with described main chamber 32 adjacency.This secondary chamber 72 is the center with the secondary axle A2 vertical with described principal axis A 1.
Secondary piston 80 is supported slidably by cylindrical secondary surfaces 70, and forms continuous sealing around this piston 80 with this secondary surfaces 70 when this piston 80 moves axially by described secondary chamber 72.Secondary spring 84 is compressed between them by described secondary piston 80 and described shell 30, this spring 84 towards this secondary piston 80 of the direction bias voltage of described principal axis A 1 to the complete extended position of shoulder 86 adjacency of this shell 30.
First and second chambers 32 and 72 liquid filling part are the parts in ameristic chamber 90, and this chamber 90 is limited by described shell 30, main piston 50 and secondary piston 80 and forms.This chamber 90 has the mobile total volume that gradually changes along with this piston 50 and 80, is the displacement D of piston 1And D 2Smooth function.This function is " level and smooth ", and wherein volume is with D 1And D 2Variation do not have unexpected increase or reduction.
Moving back and forth of main piston 50 is defined as aspirating stroke and delivery stroke, and this moment, described chamber 90 usefulness liquid were filled continuously.Since density of liquid and incompressibility in this chamber 90, the mobile hydraulic pressure P that depends in this chamber 90 of described secondary piston 80 Cav, and be not subjected to the influence of this secondary piston self inertia basically.
Described delivery stroke originates in the described main piston 50 of withdrawal fully as shown in Figure 2, described chamber power P at this moment CavEqual the supply lines pressure P InThe seam that adds suction valve is pressed (crack pressure) P CrackDescribed secondary piston 80 is stretched out fully, because force this chamber of its withdrawal to press P CavTo such an extent as to can not overcome the spring bias voltage of compressing on this secondary piston 80 too, this moment, this secondary piston 80 was resisted against on the described shoulder 86.
After this in the delivery stroke process, described main piston 50 axially inside (arrow 95) moves, as shown in Figure 3.When P is pressed in described chamber CavThe pressure P that surpasses outlet line OutAdd seam pressure P CrackThe time, described delivery valve 36 is opened to allow liquid flow to described outlet line 14.
Described main piston 50 further extension is transported to outlet line 14 with liquid, and P CavKeep P Out+ P CrackConstant.Simultaneously, described secondary piston 80 moves apart the position that it stretches out fully, and shift length is D 2, it is that P is pressed in the chamber CavLevel and smooth positive function, thereby also be the shift length D of main piston 1Smooth function.The extension of this main piston 50 makes total cavity volume V CavReduced and D 1Proportional displacement volume V 1, this part ground is remedied by the withdrawal of this secondary piston 80.The withdrawal of this secondary piston 80 makes total volume increase displacement volume V 2, this displacement volume V 2Advantageously with D 2Level and smooth relevant, and equal D 2Multiply by the cross-section area of chamber 72 and piston 80.This delivery stroke ends at the main piston that stretches out fully 50 as shown in Figure 4, and this moment, P was pressed in the chamber CavEqual P Out+ P Crack
Described aspirating stroke originates in the described main piston 50 that stretches out fully as shown in Figure 4.Along with the withdrawal of this main piston 50, the spring bias voltage makes described secondary piston 80 be returned to the position that it stretches out fully gradually, because P is pressed in the chamber CavReduce gradually.Work as P CavReach P In+ P CrackThe time, suction valve 34 is opened and is allowed liquid flow to the described chamber 90 from supply lines 12.This main piston 50 further withdrawal is extracted into liquid in this chamber 90 by suction valve 34, and P CavKeep P In+ P CrackConstant and described secondary piston 80 is stretched out fully.This aspirating stroke finishes as shown in Figure 2, and this moment, main piston 50 was withdrawn and secondary piston 80 is stretched out fully fully.
Therefore, described secondary piston 80 plays a role as cistern.In described delivery stroke process, the displacement volume V of these secondary piston 80 accumulating liquids 2, this displacement volume V 2Be transported to by different way in the described outlet line 14, and in the aspirating stroke process with this volume V 2Return to described chamber 90 fully.Thereby, the reduction and the V of total transfer rate of this pump (cubic chi per minute) 2Proportional, this V 2It is described secondary displacement distance D 2Level and smooth positive function, and preferred proportional with it, this D 2Self be that P is pressed in output OutLevel and smooth positive function.Therefore, this total transfer rate is P OutLevel and smooth positive function.
The power of the described pump 10 of driving of described motor 62 inputs is usually proportional with the product that transfer rate and output are pressed.Owing to the transfer rate of this pump 10 is configured to reduce along with the rising that output is pressed, therefore required power tends to P OutBecome than not existing at described second piston 80 and this transfer rate is not subjected to P OutLower under the situation of influence.
Preferably, select described secondary spring 84 so that transfer rate and the P that produces OutApproximately be inversely proportional to, promptly with 1/P OutProportional.This makes input power basically not with P OutAnd change, can also be at the motor of output pressure place's optimization thereby make at other pressure optimization at a power level.This can be by with having with piston displacement D 2Increase and the spring structure 100 of the elastic constants that increases is replaced these secondary springs 84 and is realized.Progressively the spring bias voltage of Zeng Jiaing can be realized by the concentric spring 101,102 and 103 that uses two or more different lengths, as shown in Figure 5.
A1 is vertical with A2 helps making described secondary piston 72 to be independent of the motion of main piston 50 for the axle of described piston, and main piston 50 extends across this secondary piston 80 and also helps this with its A2 in the process of moving back and forth.Block described secondary chamber 72 for fear of this main piston 50, this main piston 50 has at interval with the wall 110 in described chamber.The extra cavity volume that this interval produces can't reduce obtainable output presses, because liquid is incompressible.
Fig. 6 has shown another pump 10 '.The parts that it has are corresponding with the parts of Fig. 2, and play a role in an identical manner with parts shown in Figure 2, and the reference number of the corresponding part among the indication reference number that marks on it and Fig. 2 is consistent.The pump 10 of Fig. 6 all is positioned at main piston 50 ' with the pump of Fig. 2 10 different displacement volumes of its secondary chamber 72 ', secondary piston 80 ' and its generation that are, and main piston 50 ' moves back and forth along same axle A1 ' with secondary piston 80 '.
This specification uses embodiment to disclose the present invention, comprises preferred forms, and makes those of ordinary skill in the art can make and use the present invention.Patentable scope of the present invention is limited by claims, can comprise other embodiment that those of ordinary skill in the art can expect.If the parts that embodiment has these claims on literal expression there is no difference, or it comprises the equivalent structure parts that do not have essential distinction with the literal expression of these claims, and these other embodiments are also contained in the scope of these claims so.

Claims (20)

1. pumping unit, it comprises:
Shell, it has chamber, suction valve and delivery valve, can enter into this chamber by this suction valve liquid, can flow out this chamber by this delivery valve liquid;
Main piston, it is built in described chamber and moves back and forth, and by delivery valve liquid is discharged this chamber by suction valve liquid is pumped in the described chamber and during the delivery stroke of this piston during the aspirating stroke of this piston;
Liquid reservoir structure, its whole volume that is built into respect to this chamber increases extra volume, and this extra volume is the level and smooth positive function of the fluid pressure in this chamber.
2. equipment as claimed in claim 1 is characterized in that described liquid reservoir structure comprises secondary piston, and this secondary piston is built into by certain shift length and withdraws, and this shift length is the level and smooth positive function of described fluid pressure.
3. equipment as claimed in claim 2 is characterized in that distance that described extra volume equals displacement multiply by the cross-section area of this piston.
4. equipment as claimed in claim 2 is characterized in that described secondary piston is along the vertical axle withdrawal of the direction that moves back and forth with described main piston.
5. equipment as claimed in claim 4 is characterized in that described axle some points in the process of moving back and forth extend through described main piston.
6. equipment as claimed in claim 4 is characterized in that described main piston some points in the process of moving back and forth extend across and surpasses described secondary piston.
7. equipment as claimed in claim 2, it also comprises spring structure, fluid pressure resists this spring structure and plays a role and make the withdrawal of described secondary piston, this spring structure have the elastic constants that the increase with this secondary piston withdrawal increases.
8. equipment as claimed in claim 1 is characterized in that described liquid reservoir structure is built into and is used for and will turning back in the described chamber during ensuing aspirating stroke at all liq that described additional volumes accumulates during the described delivery stroke.
9. equipment as claimed in claim 10 is characterized in that described additional volumes is arranged in described main piston.
10. equipment as claimed in claim 1 is characterized in that described liquid reservoir structure is built into: reduce under the amount of liquid of discharging during the delivery stroke will be than the situation that does not have described additional volumes.
11. equipment as claimed in claim 10 is characterized in that described liquid reservoir structure is built into the liquid transfer rate that makes generation and presses oppositely relevant with the output of described pump.
12. equipment as claimed in claim 11 is characterized in that described output speed and described output pressure approximately is inversely proportional to.
13. equipment as claimed in claim 1, it also comprises the fluid supply that is connected with described suction valve, with the fluid injector that is connected with described delivery valve.
14. pumping unit, it comprises:
Shell, it has chamber, suction valve and delivery valve, can enter into this chamber by this suction valve liquid, can flow out this chamber by this delivery valve liquid;
Main piston, it is built in described chamber and moves back and forth, and by delivery valve liquid is discharged this chamber by suction valve liquid is pumped into the neutralization of described chamber; With
Cylindrical chamber, it is limited by described shell and forms and be communicated with described chamber;
Secondary piston, it is built into owing to the fluid pressure in the described chamber increases to be withdrawn into increases extra volume in the described chamber, in the gamut of this secondary piston withdrawal, this extra volume that increases is limited to the space that this secondary piston is vacateed because of its withdrawal.
15. equipment as claimed in claim 14, it is built into the liquid that will accumulate and all turns back in the described chamber in described additional volumes in described delivery stroke process in ensuing aspirating stroke process.
16. equipment as claimed in claim 14 is characterized in that described secondary piston is along the vertical axle withdrawal of the direction that moves back and forth with described main piston.
17. pumping unit, it comprises:
Shell, it has main chamber, suction valve and delivery valve, can enter into this main chamber by this suction valve liquid, can flow out this main chamber by this delivery valve liquid;
Main piston, it is built in described main chamber and moves back and forth, and by suction valve liquid is pumped in this main chamber during the aspirating stroke of this piston, by delivery valve liquid is discharged this main chamber during the delivery stroke of this piston; With
The cistern volume, it comprises the interval of single variable volume, this interval increases described main chamber continuous openness and the increase that is built into the fluid pressure in this main chamber.
18. pump as claimed in claim 17, it also comprises secondary piston, and this secondary piston is built into by the increase with described fluid pressure and retracts the volume that changes described interval.
19. pumping unit, it comprises:
Shell, it has chamber, suction valve and delivery valve, can enter into this chamber by this suction valve liquid, can flow out this chamber by this delivery valve liquid;
Main piston, it is built in described chamber and moves back and forth, and by suction valve liquid is pumped in this chamber during the aspirating stroke of this piston, by delivery valve liquid is discharged this chamber during the delivery stroke of this piston; With
Liquid reservoir structure, it is built into to receive in the delivery stroke process and from a part of liquid in the described chamber and in ensuing aspirating stroke process this whole part that receives is turned back in this chamber.
20. equipment as claimed in claim 19 is characterized in that this liquid reservoir structure is built into the liquid transfer rate that makes generation and presses oppositely relevant with the output of this pump.
CNA2006101499277A 2006-02-16 2006-10-17 Liquid pump Pending CN101021208A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US11/356,157 US20070189911A1 (en) 2006-02-16 2006-02-16 Liquid pump
US11/356,157 2006-02-16

Publications (1)

Publication Number Publication Date
CN101021208A true CN101021208A (en) 2007-08-22

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ID=38368698

Family Applications (1)

Application Number Title Priority Date Filing Date
CNA2006101499277A Pending CN101021208A (en) 2006-02-16 2006-10-17 Liquid pump

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US (1) US20070189911A1 (en)
CN (1) CN101021208A (en)
CA (1) CA2559597A1 (en)
MX (1) MXPA06013341A (en)
TW (1) TW200732560A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011116633A1 (en) * 2010-03-23 2011-09-29 北京普析通用仪器有限责任公司 Liquid path distributing valve and liquid-phase chromatographic pump comprising the same
CN102852755A (en) * 2011-07-28 2013-01-02 南通天华和睿科技创业有限公司 Plunger type chemical feeding pump

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DE102011003396A1 (en) * 2011-01-31 2012-08-02 Continental Automotive Gmbh Pump unit for a high-pressure pump
WO2017180290A1 (en) 2016-04-11 2017-10-19 Tti (Macao Commercial Offshore) Limited Modular garage door opener
CA2961090A1 (en) 2016-04-11 2017-10-11 Tti (Macao Commercial Offshore) Limited Modular garage door opener

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2011116633A1 (en) * 2010-03-23 2011-09-29 北京普析通用仪器有限责任公司 Liquid path distributing valve and liquid-phase chromatographic pump comprising the same
CN102852755A (en) * 2011-07-28 2013-01-02 南通天华和睿科技创业有限公司 Plunger type chemical feeding pump

Also Published As

Publication number Publication date
US20070189911A1 (en) 2007-08-16
MXPA06013341A (en) 2008-10-15
TW200732560A (en) 2007-09-01
CA2559597A1 (en) 2007-08-16

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Open date: 20070822