CN102449311A - Screw spindle pump arrangement - Google Patents
Screw spindle pump arrangement Download PDFInfo
- Publication number
- CN102449311A CN102449311A CN2010800237089A CN201080023708A CN102449311A CN 102449311 A CN102449311 A CN 102449311A CN 2010800237089 A CN2010800237089 A CN 2010800237089A CN 201080023708 A CN201080023708 A CN 201080023708A CN 102449311 A CN102449311 A CN 102449311A
- Authority
- CN
- China
- Prior art keywords
- pressure
- high pressure
- screw pump
- connecting line
- pump device
- 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
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/08—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing
- F04C2/12—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type
- F04C2/14—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons
- F04C2/16—Rotary-piston machines or pumps of intermeshing-engagement type, i.e. with engagement of co-operating members similar to that of toothed gearing of other than internal-axis type with toothed rotary pistons with helical teeth, e.g. chevron-shaped, screw type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C11/00—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations
- F04C11/001—Combinations of two or more machines or pumps, each being of rotary-piston or oscillating-piston type; Pumping installations of similar working principle
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/02—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations specially adapted for several machines or pumps connected in series or in parallel
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/18—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber
- F04C14/185—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by varying the volume of the working chamber by varying the useful pumping length of the cooperating members in the axial direction
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/10—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by changing the positions of the inlet or outlet openings with respect to the working chamber
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C14/00—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations
- F04C14/24—Control of, monitoring of, or safety arrangements for, machines, pumps or pumping installations characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Rotary Pumps (AREA)
- Details And Applications Of Rotary Liquid Pumps (AREA)
Abstract
The invention relates to a screw spindle pump arrangement having a low-pressure connection, a high-pressure connection, a drive spindle, and at least one idling spindle. A feed section of the idling spindles can be divided into two feeding segments that can be driven either in series or in parallel. A screw spindle pump arrangement is thereby created with little effort, wherein two operating modes can be selected without controls technology. Two tap connections that can be connected by a connecting line are provided in a center area of the feed section. The connecting line can be blocked and the low-pressure side tap connection can thereby be connected to the high-pressure connection, and the high-pressure side tap connection can be connected to the low-pressure connection.; A series circuit (high pressure, low volume flow rate) is created by the open connecting line, corresponding to a screw spindle pump according to the prior art. With the connecting line blocked, and the simultaneous pressure medium flow paths indicated above, the screw spindle pump arrangement can be simply operated as a parallel circuit (low pressure, high volume flow).
Description
The present invention relates to a kind of screw pump device as described in the preamble according to claim 1.
Screw pump has at least two or three parallel settings and screw rod that be engaged with each other, by working machine (for example motor) screw rod is among the rotation.Screw rod is contained in the housing, wherein, between the outer side surface of screw rod and housing, small spacing is arranged.
Conveyance fluid in the chamber that between screw rod and housing, in the helical duct of thread type engagement, forms along screw rod through rotation.Produce the area of low pressure through this measure in an end of screw rod or housing, produce the high-pressure area in the other end.The fluid of carrying simultaneously penetrates in the small spacing between screw rod and the housing, and produces supporting and lubricated film.
DE 39 20 901 A1 disclose a kind of screw pump with three screw rods.The rotatingshaft engagement that middle live axle and both sides are provided with is along the helical duct conveyance fluid of rotatingshaft.
And these screw rods are not straight-through spirals in the structure of the double-current method of screw pump, but are divided into two reverse spiral sections.Their chamber move toward one another when rotated.Form two areas of low pressure through this measure in two ends of screw rod, in the middle of screw rod, form a high-pressure area.
DE 10 2,006 061 971 A1 disclose a kind of double-current method screw pump with two screw rods.
The screw pump of DE 39 20 901 A1-said pump by constant motoring-defective be little in the delivery pressure and the flexibility aspect the volume flowrate of pump.
Task of the present invention in contrast to this provides aspect a kind of delivery pressure and volume flowrate at pump can be simply and the suitable screw pump device of different requirement.
This task obtains accomplishing according to the described screw pump device of claim 1 through a kind of.
In the dependent claims some other favourable scheme of the present invention is illustrated.
Screw pump device according to the present invention has high pressure joint, low-pressure connector, live axle and at least one rotatingshaft.The conveying extension of rotatingshaft can be divided into two transportation sections, said transportation section or parallelly connected the operation, or can in series move, perhaps flow through.Just can a kind of like this screw pump device be provided little expense through this measure, promptly in this device, do not having just can to select under the situation of regulation technology two running statees (when low volume flowrate than high output pressure or at the higher volumes flow time lower delivery pressure).
Be provided with two through the attachable branch joint of connecting line according to housing in the zone line of conveying extension in the preferred especially improvement project of screw pump device of the present invention.Connecting line is lockable, and wherein, can be connected with high pressure joint along first branch joint of throughput direction, can be connected with low-pressure connector along second branch joint of throughput direction.Produce be connected in series (elevated pressures, low volume flowrate) through the connecting line that opens wide, said series connection is equivalent to the screw pump of existing technology.When the connecting line locking and when simultaneously above-mentioned pressure agent flow circuits separates, said screw pump device can be simply by parallel way operation (lower pressure is than higher volume flowrate).
For the end of first transportation section and the starting point of second transportation section (the pressure agent that perhaps exists therein) are separated the width that is equivalent to the contact pin of rotatingshaft along the distance of two branch joints carrying the extension at least.Like this, at least one contact pin just can prevent the exchange of pressure agent between the zone of two branch joints.
In a preferred especially improvement project, in connecting line, be provided with switching valve, said switching valve is connected with high pressure joint through the high pressure connecting line, is connected with low-pressure connector through the low-pressure connection tube line.Like this, just can between series connection and parallel connection, change through operated valve.
Preferably the pressure agent flow channel between branch joint is closed through connecting line when the switching-over valve body is in the home position of spring pretension.Instead first branch joint is connected with high pressure joint, and second branch joint is connected with low-pressure connector.And two branch joints are connected to each other through connecting line when valve body is on positi.
In a favourable form of implementation, in the high pressure connecting line, safety check is set, said safety check is being opened towards high pressure line from switching valve, and said high pressure line is connected high pressure joint with delivery side of pump.
Reason from security of operation can be provided with on high pressure line towards the pressure limit valve of liquid case unloading.Wherein, said pressure limit valve can pneumatic guide's control.
If screw pump device has two rotatingshafts, then according to design advantageously their passage be spiral in the same way.
From the cost reason, live axle can be driven by constant bipolar motor.Its cost of production is lower than the cost of production of adjustable motor.
Instead, wherein, the pressure transducer that is connected with it can be set on high pressure line for the flexibility that improves delivery pressure and volume flowrate can be connected with the motor of rotational speed regulation with the suitability live axle.
Screw pump device preferably according to the present invention can be used for coolant/lubricant to lathe being provided.At this application forwarding method according to the present invention is particularly advantageous.In bigger cutter, need series connection (elevated pressures, low volume flowrate), in less cutter, need parallel connection (lower pressure, higher volumes flow).Two kinds of running statees of this of this pump also can advantageously be applied in the distinct cutting power of lathe.
Below, by unique accompanying drawing an embodiment according to screw pump of the present invention is carried out detailed explanation.
The figure shows a kind of according to screw pump device of the present invention.It has the screw pump 1 in the disclosed basic structure of existing technology.This screw pump figure left side sectional view illustrate.
In addition, this device also has some according to change of the present invention and expansion, and these illustrate as schematic circuti diagram in the drawings, and illustrate on the right of figure as much as possible.
Screw pump has elongated housing.This elongated housing mainly is made up of housing principal piece 2 and two end face housing lid 3,4.
Set inside at housing 2,3,4 has two rotatingshafts 6, and said rotatingshaft has small distance apart from the adjacent section of the inwall 8 of housing principal piece 2.
Rotatingshaft 6 has around the groove of spiral or path 10.Between the circle of path 10, remaining with also is the contact pin 12 around spiral.
Between the centre of housing principal piece 2 and rotatingshaft 6, be provided with live axle 14.It also has the contact pin 16 around spiral.Different around the contact pin 12 of spiral and rotatingshaft 6 of contact pin 16, wherein, live axle 14 and two rotatingshafts 6 engagements.
Shaft part 18 is formed on the upper end portion section of live axle 14 (among the figure), and said shaft part is bearing in the upper shell lid 4 of (among the figure) through rolling bearing 20, and outside housing 2,3,4, has linkage section 22.Live axle 14 can be by the (not shown) motoring through linkage section 22, wherein, and owing to the reason motor of cost can be constant motor, perhaps because higher flexibility is adjustable.
Being engaged on of biting type through live axle 14 and two rotatingshafts 6 makes these two rotatingshafts rotate when driving.Wherein, be divided into some section or chambers by the contact pin 16 through live axle 14 of the path 10 of the rotatingshaft 6 of the inwall of housing principal piece 28 restrictions, said section or chamber (in the drawings) during rotatingshaft 6 rotations move from the bottom up.The pressure agent of in low-pressure connector 24, being aspirated through this measure can be transported to high pressure joint 26, and obtains compression at this.
According to the present invention, be provided with two branch joints 28,30 that spacing is axially arranged in the housing principal piece 2 in the zone line of the conveying extension that (among the figure) extends from the bottom up.Their size transverse to throughput direction is so to select, and promptly the corresponding channel section of they and two rotatingshafts 6 exists the pressure agent to be connected.Wherein, this two branch joints 28,30 have axial spacing to each other along throughput direction, and the said spacing thickness with contact pin 16 at least is suitable.Two branch joints 28,30 have been guaranteed or the separation of the pressure agent that in corresponding channel section, exists through this measure.
In addition, also has 4/2 selector valve 32 according to screw pump device of the present invention.At spring pretension position (a) the mesolow joint 24 of the valve body of selector valve 32 through low-pressure line 34, low-pressure connection tube line 36 be connected with second branch joint 30 through second take-off line 38.In addition, first branch joint 28 is connected with high pressure line 44 with high pressure connecting line 42 through first take-off line 40 in above-mentioned on positi.High pressure line 44 couples together high pressure joint 26 with delivery side of pump P.
When valve body is in the on positi (b)-this on positi can select through switching magnet 46-from first branch joint 28 through the pressure agent flow channel of first take-off line 40, selector valve 32 and second take-off line, 38 to second branch joints 30 by open-minded.
In high pressure connecting line 42, be provided with safety check 48, it is opened to high pressure pipe line 44 from selector valve 32.
Describe in the face of function down according to screw pump device of the present invention.
Basically move serially through branch joint 28,30 according to the present invention with according to the conveying extension of two rotatingshafts 6 of underground of the present invention, perhaps instead can be divided into two transportation section 45a, 45b, these two transportation sections can be moved parallelly connectedly.
Reached the parallel connection of two transportation section 45a, 45b in the on positi (a) of the valve body of the selector valve 32 that illustrates in the drawings.Wherein, the pressure agent volume flowrate of in suction joint S, being aspirated is assigned to low-pressure connector 24 through low-pressure line 34 on the one hand, and assigns to second branch joint 30 through the low-pressure connection tube line 36 and second take-off line 38 on the other hand.Therefore two transportation section 45a, 45b of rotatingshaft 6 move parallelly connectedly; Wherein, The first high-rise volume flowrate flows to delivery side of pump end P through first take-off line 40 with high pressure connecting line 42 from first branch joint 28, and second volume flowrate flows to delivery side of pump P from high pressure joint 26 through high pressure line 44.Guarantee that in this case the pressure in high pressure connecting line 42 and high pressure line 44 is identical substantially.Like this,, and lower in the volume flowrate of delivery side of pump P at the delivery pressure of delivery side of pump P just than higher.
Flow through when switch electromagnet 46 has electric current, and just reach the series connection of two transportation section 45a, 45b when the valve body of selector valve 32 moved to the switching position with the b mark, perhaps according to the traditional type operation of screw pump device of the present invention.Be connected to each other through two branch joints of this measure 28,30, wherein, the pressure agent of on-load pressure flow into the second transportation section 45b of rotatingshaft 6 through two take-off lines 40,38 from the first transportation section 45a.Second portion improves pressure in the second transportation section 45b then, and wherein, the pressure agent flows into delivery side of pump P from high pressure joint 26 through high pressure line 44 with pressure maximum.
Volume flowrate is smaller in this case, and the pressure raising is bigger.
When the pressure in high pressure connecting line 42 and high pressure line 44 is identical substantially, when two transportation section 45a, 45b series connection, be arranged on the closure of check ring in the high pressure connecting line 42, and said safety check is opened when two transportation section 45a, 45b parallel connection.
In addition, from high pressure line 44, tell pipeline 49, in said pipeline 49, pressure limit valve 50 is set.Said pressure-limit valve makes high pressure line 44 unload to liquid case T when surpassing adjustable pressure maximum.Said pressure-limit valve 50 is pneumatic to be controlled in advance, and has stepless adjustable proportional pressure valve.
In addition, electronic pressure transmitter 52 and pressure gauge 54 are set also on high pressure line 44,, wherein, pressure are provided for pressure gauge 54 through throttle valve 56 with the delivery pressure of monitoring pump.
Screw pump device according to the present invention is particularly suitable in lathe, carrying coolant/lubricant.Why this screw pump device is preferably used for this field is because they can prevent to accumulate in the partly wear particle in the cutting oil.
Require to change the pressure and the volume flowrate of coolant/lubricant when when changing the cutter of affiliated lathe, perhaps changing cutting power.This change can just can reach according to screw pump device of the present invention need not under the situation that the rotating speed of motor is regulated to adopt.Like this, for example produce than higher pressure and smaller volume flowrate through series connection (switching position b) when cutter hour, and (switching position a) produces smaller pressure and bigger volume flowrate through parallel connection when cutter is bigger.
Wherein, compare the maximum drive power reduction about 40% of (unshowned) motor with existing technology in above-mentioned application.
Compare screw pump device according to the present invention with the screw pump of rotational speed regulation and except cost is low, also have following advantage; Be volume flowrate reduce be not to produce through reducing rotating speed, so just damage the bearing characteristics of the coolant/lubricant in the zone between contact pin 12 and the housing body 2.
The invention discloses a kind of screw pump device with low-pressure connector, high pressure joint, live axle and at least one rotatingshaft.The conveying extension of rotatingshaft can be divided into two transportation sections, and said transportation section can parallel connection or series operation.Can a kind of like this screw pump device be provided little expense through this measure, promptly in said screw pump device, can not have regulation technology ground and select two kinds of running statees.
In the zone line of carrying the extension, be provided with two through the attachable branch joint of connecting line.Connecting line is lockable, and wherein, the branch joint of low voltage side can be connected with high pressure joint, and on high-tension side branch joint can be connected with low-pressure connector.Connecting line through opening produces series connection (high pressure, low volume flowrate).The screw pump of this series connection and existing technology is suitable.When the connecting line locking, and during simultaneously above-mentioned pressure agent flow channel, said screw pump device can press parallel way (lower pressure, than higher volume flowrate) simply and move.
The reference character table
1 screw pump
2 housing principal pieces
3,4 housing lid
6 rotatingshafts
8 inwalls
10 passages
12 contact pin
14 live axles
16 contact pin
18 shaft parts
20 rolling bearings
22 junctions
24 low-pressure connectors
26 high pressure joints
28 first branch joints
30 second branch joints
32 4/2 switching valves
34 low-pressure line
36 low-pressure connection tube lines
38 second take-off lines
40 first take-off lines
42 high pressure connecting lines
44 high pressure lines
45a first transportation section
45b second transportation section
46 switch electromagnet
48 safety check
49 pipelines
50 pressure limit valves
52 pressure transducers
54 pressure gauges
56 throttle valve
The P delivery side of pump
S aspirates joint
T pressure agent case
Claims (12)
1. screw pump device; Have low-pressure connector (24), high pressure joint (26), live axle (14) and at least one rotatingshaft (6); It is characterized in that; The conveying extension of rotatingshaft (6) can be divided into two transportation sections (45a, 45b), said two transportation sections or ability parallel connection or ability series operation.
2. according to the described screw pump device of claim 1; Wherein, in the zone line of carrying the extension, be provided with two through the attachable branch joint of connecting line (38,40) (28,30), wherein; Connecting line (38,40) is lockable; And wherein, can be connected with high pressure joint (26) along first branch joint (28) of throughput direction, and can be connected with low-pressure connector (24) along second branch joint (30) of throughput direction.
3. according to the described screw pump device of claim 2, wherein, the spacing of two branch joints (28,30) is along carrying the extension suitable with the width of the contact pin (12) of the spiral of rotatingshaft (6) at least.
4. according to claim 2 or 3 described screw pump devices; Wherein, In connecting line (38,40), be provided with selector valve (32); Said selector valve is connected with high pressure joint (26) through high pressure connecting line (42), and is connected with low-pressure connector (24) through low-pressure connection tube line (36).
5. according to the described screw pump device of claim 4, wherein, connecting line (38,40) is locking when the valve body of selector valve (32) is in the home position (a) of spring pretension; And wherein; First branch joint (28) is connected with high pressure joint (26), and second branch joint (30) is connected with low-pressure connector (24), and wherein; When valve body was on positi (b), these two branch joints (28,30) were connected to each other through connecting line (38,40).
6. according to claim 4 or 5 described screw pump devices; Wherein, Safety check (48) is set in high pressure connecting line (42), and said safety check is opened towards high pressure line (44) from selector valve (32), and said high pressure line couples together high pressure joint (26) and delivery side of pump (P).
7. according to each the described screw pump device in the aforementioned claim, wherein, pressure limit valve (50) is connected with high pressure line (44), and said pressure limit valve makes high pressure line (44) unload to pressure agent case (T).
8. according to the described screw pump device of claim 7, wherein, pressure limit valve (50) is by pneumatic preparatory control.
9. according to each the described screw pump device at least in the claim 3 to 8, have two rotatingshafts (6), their passage (10) is a spiral in the same way.
10. according to each the described screw pump device at least in the aforementioned claim, wherein, live axle (14) is by the motoring at the two poles of the earth.
11. according to each the described screw pump device at least in the claim 1 to 9, wherein, live axle (14) is connected with the motor of rotational speed regulation, wherein, goes up the pressure transducer (52) that setting is connected with motor at high pressure line (44).
12., be used for cooling-and/or oiling agent being provided to lathe according to each the described screw pump device at least in the aforementioned claim.
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE102009015685A DE102009015685A1 (en) | 2009-03-31 | 2009-03-31 | Screw pumps arrangement |
| DE102009015685.2 | 2009-03-31 | ||
| PCT/EP2010/001096 WO2010112108A2 (en) | 2009-03-31 | 2010-02-23 | Screw spindle pump arrangement |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102449311A true CN102449311A (en) | 2012-05-09 |
Family
ID=42674932
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010800237089A Pending CN102449311A (en) | 2009-03-31 | 2010-02-23 | Screw spindle pump arrangement |
Country Status (5)
| Country | Link |
|---|---|
| US (1) | US20120121450A1 (en) |
| JP (1) | JP2012522166A (en) |
| CN (1) | CN102449311A (en) |
| DE (1) | DE102009015685A1 (en) |
| WO (1) | WO2010112108A2 (en) |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE102010054401B4 (en) * | 2010-12-14 | 2017-02-02 | Grob-Werke Gmbh & Co. Kg | processing machine |
| DE102014102390B3 (en) * | 2014-02-25 | 2015-03-26 | Leistritz Pumpen Gmbh | Screw Pump |
| WO2017009994A1 (en) * | 2015-07-16 | 2017-01-19 | 株式会社Ihi | Triple gear pump and fluid supplying device |
| US20180314274A1 (en) * | 2017-04-28 | 2018-11-01 | Atlas Copco Comptec, Llc | Gas processing and management system for switching between operating modes |
| JP7072417B2 (en) * | 2018-03-27 | 2022-05-20 | 株式会社日立産機システム | Screw compressor |
| DE102018116772B3 (en) * | 2018-07-11 | 2019-11-07 | Netzsch Pumpen & Systeme Gmbh | Screw pump and method of servicing such a screw pump |
| DE102018130472A1 (en) * | 2018-11-30 | 2020-06-04 | Nidec Gpm Gmbh | Screw pump |
| CN111008480B (en) * | 2019-12-13 | 2023-05-23 | 湘潭大学 | Novel pump type selection method for centrifugal pump station energy expansion requirement |
| CN114165935B (en) * | 2021-12-13 | 2023-06-09 | 恩德特机械（苏州）有限公司 | Screw type water chilling unit based on intelligent control |
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| JPS61149597A (en) * | 1984-12-21 | 1986-07-08 | Hitachi Ltd | Operation control device for multistage compressor |
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| JPS5414008A (en) * | 1977-07-02 | 1979-02-01 | Sanko Ponpu Kougiyou Kk | Positive displacement axial flow rotary piston |
| DE3920901C2 (en) | 1989-06-26 | 1995-02-16 | Allweiler Ag | Screw pump |
| JPH05157059A (en) * | 1991-12-03 | 1993-06-22 | Mitsubishi Heavy Ind Ltd | Controller of screw pump |
| JP2002070757A (en) * | 2000-08-31 | 2002-03-08 | Tokico Ltd | Variable displacement gear pump |
| JP2003278673A (en) * | 2002-03-26 | 2003-10-02 | Hitachi Ltd | Screw compressor |
| DE102006061971A1 (en) | 2006-12-21 | 2008-06-26 | Leistritz Ag | Double flow screw-spindle pump for feeding e.g. multi-phase mixtures of crude oil and petroleum, has drive spindle and running spindle with profiled stacks, which are designed such that feeding chambers are opened in time-shifted manner |
| JP2008291864A (en) * | 2007-05-22 | 2008-12-04 | Yuken Kogyo Co Ltd | Cylinder drive unit |
-
2009
- 2009-03-31 DE DE102009015685A patent/DE102009015685A1/en not_active Withdrawn
-
2010
- 2010-02-23 JP JP2012502475A patent/JP2012522166A/en active Pending
- 2010-02-23 WO PCT/EP2010/001096 patent/WO2010112108A2/en active Application Filing
- 2010-02-23 US US13/262,426 patent/US20120121450A1/en not_active Abandoned
- 2010-02-23 CN CN2010800237089A patent/CN102449311A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1728143A1 (en) * | 1968-08-30 | 1972-03-30 | Max Streicher | Eccentric screw pump |
| JPS61149597A (en) * | 1984-12-21 | 1986-07-08 | Hitachi Ltd | Operation control device for multistage compressor |
| DE19945871A1 (en) * | 1999-09-24 | 2001-03-29 | Leybold Vakuum Gmbh | Screw pump, in particular screw vacuum pump, with two pump stages |
| US20040037915A1 (en) * | 2000-05-23 | 2004-02-26 | Jorg Dantlgraber | Drive device, in particular for the locking unit, the injection unit or the ejector of an injection-moulding machine for plastics |
| US20040184943A1 (en) * | 2003-03-17 | 2004-09-23 | Toshiba Carrier Corporation | Fluid machinery |
| JP2007276525A (en) * | 2006-04-03 | 2007-10-25 | Toyota Motor Corp | Hydraulic pressure source device |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2010112108A3 (en) | 2010-11-25 |
| DE102009015685A1 (en) | 2010-10-07 |
| WO2010112108A2 (en) | 2010-10-07 |
| US20120121450A1 (en) | 2012-05-17 |
| JP2012522166A (en) | 2012-09-20 |
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Application publication date: 20120509 |