CN101956702A

CN101956702A - Positive displacement pump

Info

Publication number: CN101956702A
Application number: CN2009102080512A
Authority: CN
Inventors: M·辛德勒
Original assignee: FMO TECHNOLOGY GmbH
Current assignee: FMO TECHNOLOGY GmbH
Priority date: 2008-10-20
Filing date: 2009-10-19
Publication date: 2011-01-26
Anticipated expiration: 2029-10-19
Also published as: KR101214054B1; CN101956702B; DE102009050143A1; IN2009KO01235A; KR20100044122A

Abstract

A positive displacement pump for reducing cavitation tendency can be assistantly driven by injection flow like water-jet pump. According to the invention, the positive displacement pump directs to only one of the two channel branches (21, 22) asymmetrically stemed from a main channel (20). In such case, The inflow axis of the driving channel (30) generated driving flow tranverses the inlet (23) of the other channel branch (21) and is directed at the second channel branch (22), so that reasonable distribution of inflow in the main channel (20) is ensured when flowing axle (31) ejects driving flow especially at a high conveying speed. Most of the driving flow is sent to the second channel branch (22). The positive displacement pump can be produced in batches and is suitable for inner gear pump or vane pump on a vehicle for conveying lubricating oil.

Description

Positive displacement pump

Technical field

The present invention relates to positive displacement pump, relate in particular to the internal gear pump or the vane pump that are used for carrying lubricant oil at automobile.

Background technique

In order to reduce the cavitation tendency, the situation that the suction stream of positive displacement pump can be similar in the water jet pump additionally promotes with propulsive jet like that.Can advantageously from the fluid of pumping pressure side, generate this propulsive jet in the case.FR 2443598 has described this principle intuitively according to internal gear pump.

DE 4436505A1 discloses the another kind of internal gear pump that utilizes this principle.Nozzle by supercharging channel end place produces propulsive jet, and this propulsive jet only points to the suction kidney of this pump.The supercharging passage can be cast with nozzle and finish in pump casing.

DE 4138516A1 discloses a kind of vane pump, and the propulsive jet of employing sparger additionally promotes the suction stream of this vane pump.This sparger is inserted the suction passage of pump coaxially as independent parts.This suction passage extends and is branched off into there the bilateral packing of T shape on the outer ring of vane pump.Sparger radially points to this outer ring.Also should rotate this sparger, so as in addition and suction stream come together to guide propulsive jet.In the improvement project by DE 19836628A1 and disclosed this type of vane pump of DE 10037080A1, for sparger is provided with two jets, wherein, these two propulsive jet scan mirrors are as the channel branch of symmetric arrangement.

Summary of the invention

Task of the present invention is, a kind of positive displacement pump according to the illustrated principle work of beginning is provided, and it has solved preferably in batch manufacturability, high efficiency and the compromise between the suction characteristic of low cavitation on the wide transfer rate scope.

Illustrated positive displacement pump solves this task in the employing claim 1.Therefore, this positive displacement pump is configured to fluid is transported on the pressure side from the suction side and have shell, in this shell, also comprise be used to rotate squeeze the unit squeeze the chamber ( ) and the suction passage system.This suction passage system comprises the main passage and the first and second passage branch roads.Extend to deep inside from the suction connecting end on the shell main passage, and wherein, the first passage branch road separates through inlet from the main passage angledly and the main passage extends into the second channel branch road subsequently.In subsequent process, these two passage branch roads enter and squeeze the chamber.In addition, in shell, also comprise the promotion passage that enters the suction passage system, preferably in the zone of inlet.This promotion passage is configured on the pressure side fluid is accelerated into propulsive jet.Can promote the fluid of suction side by this propulsive jet.According to being characterised in that especially of positive displacement pump of the present invention, the inflow axis that promotes passage crosses the inlet in the first passage branch road and points to the second channel branch road.In the case, this flow into axis given in advance the inceptive direction of propulsive jet.

Compared with prior art unique layout of this inflow axis is based on following consideration with aliging: if the suction passage of positive displacement pump comes out from the outside to the deep inside extension and from angled ground, main passage branch, can have following situation so: compare with the passage branch road that continue to extend on branch line, the passage branch road that branch of institute comes out is more suitable in flowing can being designed to be usually aspect cross section and the bottom land.More precisely particularly has how operational structure space than the passage branch road that on branch line, continues to extend to deep inside because of common for the passage branch road that branch of outside institute comes out.Therefore, rule of thumb, the passage branch road that continues to extend particularly is disadvantageous under the situation of high transfer rate and therefore may be supplied with by halves.Thus, the oil stream in the passage branch road that the oily stream in the passage branch road that this continuation is extended may come out than institute branch earlier tends to cavitation, promptly tends to the deposition of bubble.In addition, this type of asymmetric branch shows in test, even in the channel branch situation that designs comparably on flow technique, the passage branch road that branch of institute comes out is advantageously more drawn suction stream near the inlet of some with itself and suction connecting end usually from the main passage.

Based on these understanding and advantageously, on purpose propulsive jet is only pointed in two passage branch roads and the inflow axis that promotes passage is set for this reason, so that this inflows axis crosses the inlet of the first passage branch road that branch of institute comes out and points to the second channel branch road of continuation extension.Can particularly under high transfer rate situation, help distributing suitably suction stream and basically the volume of propulsive jet all be sent into the second channel branch road based on these unique measures at the branch line place.Therefore, effectively should the right possible cavitation that advantageously in the second channel branch road, produces and prevented cavitation noise and cavitation erosion thus.In addition, so the propulsive jet of implementing can be integrated in simple mode, especially is cast to finish in the preferred shell of being made up of a plurality of parts of pump.In the case, promoting passage can save the mode of structure space and extend on the next door, main passage and promote passage and the main passage can be set in the case member.In addition, the promotion passage can terminate in before ingress or this inlet by rights or enter the suction passage system.At last, enter the high efficiency that the passage branch road that squeezes the chamber can be reached positive displacement pump by two.

Although because its batch manufacturability is specially adapted to carry the internal gear pump and the vane pump of lubricant oil in automobile, can be used for other pump type and application target equally according to positive displacement pump of the present invention.Positive displacement pump can also be crescent gear pump, external gear pump, revolving valve vacuum pump or the pendulum valve pump with constant or variable delivered volume, and these pumps have at least one element that squeezes around the running shaft rotation equally.

Description of drawings

Below further specify embodiments of the invention with reference to the accompanying drawings.Accompanying drawing illustrates:

Fig. 1 shows the schematic positive displacement pump in the oil circulation;

Fig. 2 shows the detail section according to the positive displacement pump of Fig. 1; And

Fig. 3 shows the exploded view according to the positive displacement pump of Fig. 1.

Embodiment

The positive displacement pump that schematically shows among Fig. 1 is connected in the oil circulation and has shell 1, in this shell 1, comprise the rotation that is used for not being shown specifically squeeze the unit squeeze chamber 2.Like this squeeze the especially rotor-blade unit of the gear train of internal gear pump or gears for internal gear pump group, vane pump of unit, but also can be have at least one around running shaft 3 rotations squeeze element each squeeze the unit.

Except positive displacement pump, oil circulation also comprises oil groove 4 and will come lubricated complete sets of equipment 5 with oil, and this complete sets of equipment 5 is internal-combustion engine or the gearbox in the automobile particularly.By positive displacement pump, the oil in the oil circulation is transported on the pressure side from the suction side.The suction side comprises that oil groove 4 is with the suction lead 6 that oil groove 4 is connected with the suction connecting end 7 at shell 1 place and comprise the suction passage system that is integrated in the shell 1 in addition.The oil circuit on the pressure side has catheter pressure 8, this catheter pressure 8 at first in the enclosure portion from the pressure connecting terminal 9 that squeezes chamber 2 and extend to shell 1 and continue to extend into complete sets of equipment 5 in housing exterior.Overvoltage conduit 10 also belongs on the pressure side in addition, and this overvoltage conduit 10 branch from catheter pressure 8 comes out and is connected with another connecting end 12 of shell 1.Simple pressure regulator valve 11 connects into overvoltage conduit 10, opens during this pressure regulator valve 11 is regulated pressure in Overpressure of a safety valve conduit 8 predetermined value.The conduit 13 that turns back to oil groove 4 from complete sets of equipment 5 has sealed and should circulate by oil.

The suction passage system that is included in the shell 1 of positive displacement pump comprises main passage 20, first passage branch road 21 and second channel branch road 22.Must recognize that radially extend to deep inside from the suction connecting end 7s of shell 1 outside main passage 20, promptly more approaches to squeeze the running shaft 3 of chamber 2.In the case, first passage branch road 21 at first from the main passage 20 through the inlet 23 roughly meet at right angles ground branch come out.Preferably, this means into the angle in 90 ° ± 15 ° scopes and be roughly parallel to running shaft 3 in addition in the present embodiment.After this, main passage 20 directly continues into second channel branch road 22 or almost continues into second channel branch road 22 in the present embodiment point-blank at transition 24 places.In the case, transition 24 advantageously is characterized in the oil that comes autonomous channel 20 in the suction passage system and which position only flows into second channel branch road 22 from.

In addition, as seen, two

passage branch roads

21 and 22 enter at axially relative both sides 14a and 14b place and to squeeze chamber 2 in Fig. 1, and wherein, inflow region is implemented as suction kidney 25 and 26.In addition, first passage branch road 21 the external shaft that squeezes chamber 2 to through and correspondingly from the side 14a change to side 14b.In contrast, second channel branch road 22 only extends squeezing on the side 14a of chamber 2.In addition, first passage branch road 21 has the cross section bigger all the time than second channel branch road 22 in its narrowest position.This can also depend on structure space, because for example outwards have how operational structure space than inside near squeezing chamber 2 in shell 1.Because the bigger cross section of first passage branch road 21 and because the inlet 23 of first passage branch road 21 in the front of the transition 24 that is used for second channel branch road 22, thereby first passage branch road 21 rule of thumb advantageously aspirates.This is confirmed by corresponding test.Particularly under the situation of the transfer rate that increases, second channel branch road 22 is compared with first passage branch road 21, in case of necessity the oil of Que Faing at first feeder current go into second channel branch road 22.Therefore, although second channel branch road 22 is long and have more bending, the oil stream in second channel branch road 22 earlier tends to the deposition of bubble than the stream of the oil in the first passage branch road 21.For this is suppressed, in shell 1, in the zone of main passage 20, comprise so-called promotion passage 30.This promotion passage is configured on the pressure side oil just in time is accelerated into propulsive jet as described below like that.The situation that can be similar in the water jet pump by this propulsive jet promotes the oil of suction side like that.

Fig. 2 further shows according to the suction passage system in the positive displacement pump of Fig. 1 in perpendicular to the detail section of running shaft 3 and promotes passage 30.Must recognize that once more main passage 20 is radially extended to deep inside from suction connecting end 7s.For this reason, the inner region that shows positive displacement pump according to the circumference shown in broken lines that squeezes chamber 2.Illustrated that first passage branch road 21 is how 20 axial separation are come out from the main passage at inlet 23 places in addition again or be separated to the plan.Illustrate in addition, main passage 20 is how directly to change in the second channel branch road 22 at transition 24 places after this." after this " be illustrated in back about the inlet 23 on the direction of suction stream 28 in the main passage 20.Then, second channel branch road 22 after transition 24 same axially or be separated into suction kidney 25 with entering plan.

Promoting passage 30 separates by dividing plate 27 with main passage 20.Promote passage 30 and main passage 20 and extend abreast side by side from suction connecting end 7 and connecting end 12, up to promote passage 30 more crooked and this with main passage 20 into about 13 ° acute angle and directly entering the mouth at last and entered the suction passage system before 23.Can be clear that in the case, promote passage 30 and dwindle into cross section 32 towards its inflow direction.This cross section that dwindles 32 act as and is used to promote to flow 29 nozzle.Promotion stream 29 is promoted passage 30 by the overvoltage conduit 10 under the overpressure situation from the pressure side sending into of positive displacement pump and is penetrated as propulsive jet in the inflow that promotes passage 30 or the end in cross section 32.This propulsive jet that is not shown specifically has than suction stream 28 remarkable higher flow velocitys and suction stream 28 is disconnected.In the case, the inceptive direction of the inflow axis 31 that promotes passage 30 propulsive jet given in advance under the situation that is independent of the deflection that may occur after penetrating.In the present embodiment, the imagination of the center line by the cross section 32 that dwindles prolongs and obtains flowing into axis 31.

If positive displacement pump is carried more oil and therefore special cavitation tendency increase in second channel branch road 22 under the speed conditions that rises, oil is promoted passage 30 from the pressure side sending into of positive displacement pump so.For this reason, promote passage 30 on the pressure side being connected by pressure regulator valve 11 and positive displacement pump.Adjusting pressure on the pressure side is added to pressure regulator valve 11.When regulating the predetermined value of pressure in Overpressure of a safety valve conduit 8, pressure regulator valve 11 is opened, and promotes passage 30 so that oil flows to connecting end 12 by overvoltage conduit 10 and enters from catheter pressure 8.This oil or promote that stream 29 is foregoing to be accelerated into propulsive jet and to send into the suction passage system with unique mode like that in promoting passage 30.Therefore from Fig. 1 and Fig. 2 as seen, the inflow axis 31 that promotes passage 30 cross in the first passage branch road 21 inlet 23 and in transition 24 sensing second channel branch road 22.Axis 31 penetrates propulsive jet and major part process above inlet 23 along flowing into.Do not have thus propulsive jet or only the propulsive jet volume of a less relatively part be admitted to first passage branch road 21.In contrast, second channel branch road 22 additionally is loaded into and is preferably greater than most propulsive jets of 80% or 90%.In addition as can be seen from Fig. 1, flow into axis 31 and cross inlet 23 in the mode that separates.That is to say, flow into axis 31 horizontal expansion above the opening of inlet 23 at certain intervals.Advantageously, propulsive jet can be by this way carries out different acceleration to the fluid layer that should flow through of suction stream 28 or with fluid layer that the opening of inlet 23 remotely flows through at a distance above inlet 23.Thus, propulsive jet can on purpose promote these fluid layers in the second channel branch road 22.As can be seen from Fig. 1, flow into axis 31 and cause in half cross section relative of main passage 20, crossing inlet 23 prejudicially with inlet 23.Replacedly or replenish ground, flow into axis 31 to be provided with the 20 one-tenth one low-angle modes in main passage so that flow into axis 31 no longer in present embodiment with constant interval but cross inlet 23 and propulsive jet with the interval that increases and be similar to situation injection above inlet 23 like that in trench.In addition, flow into axis 31 can also than shown in farther mode cross inlet 23 prejudicially.Especially main passage 20 the inlet 23 opposites 1/3rd cross sections in.In any case,, particularly suction stream 28 is carried out suitable distribution and additionally all loads second channel branch road 22 basically with the oil of propulsive jet having supported under the situation of high transfer rate in main passage 20 based on this unique jet guiding.Through after the transition 24, this propulsive jet deflects at the wall place of playing guiding device 33 effects of second channel branch road 22 and sucks kidney 25 at propulsive jet.For this reason, this guiding device 33 that is implemented as wall is mounted obliquely within the opposite that flows into axis 31 with suitable manner.

According to being on the other hand of the positive displacement pump of Fig. 1, the shell 1 of positive displacement pump is implemented as the cast casings of being made up of three parts with two corresponding separating surfaces 15 and 16.As especially as can be seen from Fig. 3, the housing parts 19 of bottom comprises a part of squeezing chamber 2, first passage branch road 21 and sucks kidney 26 in the drawings.Middle housing parts 18 usefulness separating surfaces 16 have axially met the boundary to be squeezed chamber 2 and comprises main passage 20, inlet 23, second channel branch road 22, suction kidney 25 and the remaining part that promotes passage 30 and first passage branch road 21.The housing parts 17 of top is implemented as lid and has sealed main passage 20 and promoted passage 30.Importantly, main passage 20 and promote passage 30 and enter the mouth 23 and the subsequent section of first passage branch road 21 at separating surface 15 places be open wide and can the demoulding at separating surface 15 places from placing.In the case, be used for the connecting end 12 that the suction connecting end 7 of main passage 20 and being used to promotes passage 30 and can together be arranged on housing parts 17 in the present embodiment.It shall yet further be noted that at last alternatively, can also make to promote the suction zone that position that passage 30 proposes being different from enters inlet 23, especially enter in the wall of bending of inlet 23.Can make in addition promote passage 30 in inlet 23 and/or on inlet 23 outstanding (fortragen) some, especially in the mode of sleeve pipe.

Claims

1. one kind is used for fluid is transported on the pressure side positive displacement pump from the suction side, it has shell (1), in described shell (1), comprise be used to rotate squeeze the unit squeeze chamber (2) and suction passage system, described suction passage system comprises main passage (20), first passage branch road (21) and second channel branch road (22), wherein, extend to deep inside from the suction connecting end (7) of described shell (1) described main passage (20), described first passage branch road (21) is separated through inlet (23) from described main passage (20) angledly, described main passage (20) continues into described second channel branch road (22) subsequently, described two passage branch roads (21,22) enter the described chamber (2) of squeezing, described positive displacement pump also has and is included in the described shell (1), enter described suction passage system, be used for described fluid on the pressure side is accelerated into the promotion passage (30) of propulsive jet, can promote the fluid of described suction side by described propulsive jet, wherein, the inflow axis (31) of described promotion passage (30) crosses the inlet (23) in the described first passage branch road (21) and points to described second channel branch road (22).

2. positive displacement pump as claimed in claim 1 is characterized in that, radially extend to deep inside from the outside suction connecting end (7) of described shell (1) described main passage (20).

3. positive displacement pump as claimed in claim 1 is characterized in that, (14a 14b) locates to enter the described chamber (2) of squeezing to described two passage branch roads (21,22) in relative side.

4. positive displacement pump as claimed in claim 1 is characterized in that, described first passage branch road (21) is separated from described main passage (20) to become the angle in 90 ° ± 15 ° scopes.

5. as claim 3 or 4 described positive displacement pumps, it is characterized in that the described chamber of squeezing of described first passage branch road (21) extend past.

6. positive displacement pump as claimed in claim 1 is characterized in that, the cross section of described first passage branch road (21) in its narrowest position all the time greater than the cross section of described second channel branch road (22).

7. positive displacement pump as claimed in claim 1 is characterized in that, described main passage (20) locate to continue into described second channel branch road (22) in transition (24).

8. positive displacement pump as claimed in claim 1 is characterized in that, described promotion passage (30) dwindles towards its inflow direction.

9. positive displacement pump as claimed in claim 1 is characterized in that, described promotion passage (30) enters described suction passage system in the zone of described inlet (23).

10. as claim 1 or 9 described positive displacement pumps, it is characterized in that described suction passage system is located or entered to described promotion passage (30) before or at described inlet (23) at described inlet (23) in the wall of described promotion passage (30).

11., it is characterized in that described promotion passage (30) is given prominence in described inlet (23) or given prominence in described inlet (23) top as claim 1 or 9 described positive displacement pumps.

12. positive displacement pump as claimed in claim 1 is characterized in that, extend abreast described promotion passage (30) and described main passage (20).

13., it is characterized in that described promotion passage (30) is to enter described suction passage system with the acutangulate mode in described main passage (20) as claim 1 or 12 described positive displacement pumps.

14. positive displacement pump as claimed in claim 1 is characterized in that, described inflow axis (31) crosses described inlet (23) in the mode that separates.

15. positive displacement pump as claimed in claim 14, it is characterized in that described inflow axis (31) crosses described inlet (23) facing in half cross section of described inlet (23) and/or facing in 1/3rd cross sections of described inlet (23) of described main passage (20) of described main passage (20).

16., it is characterized in that described inflow axis (31) crosses described inlet (23) with interval constant or that increase as claim 14 or 15 described positive displacement pumps.

17. positive displacement pump as claimed in claim 7 is characterized in that, the inflow axis (31) of described promotion passage points to described second channel branch road (22) in transition (24).

18., it is characterized in that described propulsive jet locates to deflect into suction kidney (25) at guiding device (33) afterwards in described transition (24) as claim 7 or 17 described positive displacement pumps.

19. positive displacement pump as claimed in claim 1, it is characterized in that described shell (1) comprises a plurality of housing parts (17,18,19), wherein said promotion passage (30) and described main passage (20) are included in the housing parts (18) in the described housing parts.

20. positive displacement pump as claimed in claim 19 is characterized in that, a described housing parts (18) is a cast member, and described main passage (20) and described promotion passage (30) are formed in the described cast member by foundry engieering.

21. positive displacement pump as claimed in claim 20 is characterized in that, described main passage (20) and described inlet (23) and described promotion passage (30) are located at the separating surface (15) of a described housing parts (18) can be by foundry engieering by the demoulding.

22., it is characterized in that a described housing parts (18) locates axially to connect the described chamber (2) of squeezing, boundary at second separating surface (16) as each described positive displacement pump in the claim 19 to 21.

23. positive displacement pump as claimed in claim 1 is characterized in that, described promotion passage (30) on the pressure side is connected with the described of described positive displacement pump by pressure regulator valve (11).

24. positive displacement pump as claimed in claim 23 is characterized in that, described adjusting pressure on the pressure side is added to described pressure regulator valve (11).

25. positive displacement pump as claimed in claim 24 is characterized in that, described pressure regulator valve (11) is opened when surpassing the predetermined value of described adjusting pressure.

26. positive displacement pump as claimed in claim 1, it is characterized in that, described positive displacement pump is internal gear pump, crescent gear pump, external gear pump, revolving valve vacuum pump or the pendulum valve pump with constant or variable delivered volume, and these pumps have at least one element that squeezes around running shaft (3) rotation.