DE2503801A1 - DEVICE FOR SUPPLYING TWO CONSUMPTION CIRCUITS WITH PRESSURIZED FLUID - Google Patents

Description

Ba

Poclain S.A., Le Plessis-Belleville, France

Device for feeding two consumption circuits with pressurized fluid

There are already devices for feeding pressurized fluid known by means of several pumps with constant displacement and driven by a single diesel engine, feed two consumption circuits.

It often appears economically advantageous to have a diesel engine with limited power and even with it to choose a maximum output that is below the sum of the maximum outputs of the various pumps. It goes without saying that when these latter conditions are combined, there is a need is to provide a device that the power required by driving the pumps to a value limited to the maximum power of the engine.

One of these facilities is that one or more of the normally feed each of the circuits Pump delivers to a fluid reservoir without pressure.,. This production of the connection of the delivery of the pumps with the reservoir is also controlled by Manifolds brought about, which is arranged in the delivery lines, the control by the pressure of the delivery

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takes place even in every circle. In spite of the aforementioned control, this does not make optimum use of the power of the diesel engine allows, especially in the case where the delivery of all pumps is adapted so that they is directed to a single one of the circles.

In order to overcome the shortcomings of the known solutions inherent in this last embodiment, proposes the invention a new control design for distributors before, by means of a favorable combination of the effects of the pressures of both consumption circuits. To this This enables the connection between the delivery of a pump and the consumption circuit to be maintained, which is connected there, for a pressure in this circuit that is above the pressure above that

- In the known devices - the mentioned promotion with the reservoir or fluid container in connection is brought.

For this purpose, the invention is based on a device for feeding two consumption circuits Pressurized fluid containing:

- a fluid container;

- a first group of pumps, each with a constant capacity;

- a first consumption circuit;

- a first feed line that has a first pump that

belongs to the first pump group, connects to the first consumption circuit;

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- A first arranged in the first feed line Two-position distributor that, in its first position, adjusts the port duration of the first feed line and in its second position the establishment of a connection of part of the first feed line, which is located between the first pump and the first manifold, with the container ensures;

- a second group of pumps, each with a constant Capacity;

- a second consumption circuit;

a second feed line connecting a second pump belonging to the second pump group to the second Consumption line connects;

- A arranged in the second feed line second manifold with two positions, which in his first position dLe port duration of the second feed line and in its second position the establishment of a connection of part of the second feed line, which is located between the second pump and the second manifold, with the container ensures;

- a third manifold with two positions, located between the second manifold and the second Consumption circuit is arranged in the second feed line;

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- A connecting line that connects the third distributor with part of the first feed line, which is located between the first distributor and the first consumption circuit, connects, while the third Manifold in its first position the connection "between the second manifold and the second Consumption circuit and in its ^ second position the connection between the second distributor and the Connecting line produces and in its level the part of the second feed line that is directly connected to is connected to the second consumption circuit, shuts off,

The invention consists essentially in

that a first and second control member and a first return member are attached to the first manifold, wherein the first and the second control element have an effect which is opposite to the effect of the first return element and this return member has an effect that tends to move this first distributor in its first position to move, while third and fourth control organs and a second return organ on the second distributor are arranged, of which the third and fourth control members counteract the action of the second return member, which has an action which tends to to slide this second distributor into its first position,

that also a first control line contained between the first distributor and the first consumption circuit Connects part of the first feed line to the first control element,

that a second control line is the part contained between the second distributor and the third distributor the second feed line connects,

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that "an additional line between ' the first distributor and the first consumption line included part of the first feed line with the connects between the second and the third manifold contained part of the second feed line, wherein a reciprocating valve is arranged in this additional line,

that also a third control line is contained between 'the second and the third distributor Connects part of the second feed line to the third control element,

that a fourth control line connects the output of the valve to the fourth control member and.

that the pumps of the first and second pump groups on a single drive motor are arranged, whose maximum power is less than the sum of the maximum powers of the various pumps.

The following arrangements are preferably made:

- The first and the second steering body is respectively formed by a cylinder-piston device, the ratio of the sections of these cylinder-piston devices is equal to the ratio of the sum of the displacements of the pumps of the first group and the sum of the Displacement of the pumps of the second group by the Size of the displacement of the second pump of this second group is reduced accordingly.

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- The third and fourth control members are each formed by a cylinder-piston device, the ratio of the sections of these cylinder-piston

'Facilities is equal to the ratio of the sums the displacements of the pumps of the second or the first group.

Further details of the invention emerge from the following description of an illustrated in the drawing Embodiment, the description and the drawing are only for explanation, but not serve to limit the invention. Illustrate in the drawing

Fig. 1 is a schematic representation of an inventive Feed or supply device;

Fig. 2 is a diagram showing the functional conditions of the device illustrated in FIG. 1.

The illustrated device comprises the following parts:

- a sole drive engine designed as a diesel engine,

- four pumps 2, 3, 4, 5 with constant displacement (or with constant capacity for a given rotation speed,

- a reservoir or a container 6 for fluid,

- A first distributor 7, a second distributor 8 and a third distributor 9, each with two positions, as well

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- A first consumption circuit 10 and a second consumption circuit 11..

The drive shafts 12, 13, 14 and 15 of pumps 2, 3, 4 and 5 are rotatably connected to pinions 16, 17, 18 and 19, respectively. Likewise, a gear 20 is rotationally fixed with the .Output shaft 21 of the engine 1 connected. The pinion is in engagement with the pinions or gears 16 and 20, while the pinion 18 is meshed with the gears 19 and 20.

A line 22 connects the first distributor 7 to the first consumption circuit 10, while a line this distributor 7 with the container 6 and a return line 24 connect the consumption circuit 10 with the container 6. The pump 2 is connected to the reservoir 6 through its suction line 25 and to the line 22 through its delivery line 26 connected. The pump 3 is even with the container 6 through its suction line 27 and with the first Distributor 7 through its delivery line 28 in connection.

The pump 4 is connected to the container 6 through its suction line 29 and connected to the second distributor 8 by its delivery line 30. The second distributor 8 is in turn connected to the third distributor 9 by a line 31, while the second consumption circuit 11 is connected to the container 6 by a return line 32 and is connected to the third distributor by a line 33. A line 50 connects the second Distributor 8 with container 6. ■

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The pump 5 is connected to the reservoir 6 through its suction line 34 as well as with the line 31 through its delivery line 35 in connection. Finally, a connecting line connects 36 the third distributor 9 with the line 22.

Two cylinder-piston devices 38 and 39 (with corresponding Sections S, g and S, ") are attached to the manifold 7 and have effects that are those of a first Counteracting spring 40, which is also attached to this manifold. These cylinder-piston devices are corresponding to lines 22 and 31 by lines 41 and 42 connected.

Il

Two cylinder-piston devices 42, 44 (with sections S _1. , Or Suu) are attached in the same way to the distributor 8 and have effects that are opposite to the action of a second spring 45, which is also attached to this distributor. An additional line 46 connects the lines 22 and 31 » , a reciprocating valve 47 being arranged in this additional line 46; the cylinder-piston device 44 is connected to the outlet of the valve 47 by a line 48, while the cylinder-piston device 43 is connected to the line 31 by a line 49.

The following equations should preferably apply:

S ₃₈ Zs ₃₉ = (C ₂ + c ₃ ) / c ₅

Here are C ₂ , C ,, C ^ and C ₁ - the displacement of pumps 2, 3, and 5, respectively.

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In the two positions of the first distributor 7, the following results accordingly:

- In the first position there is the action of the spring on the cylinder-piston devices 38, 39, before is the connection between lines 22 and 28 is established and line 23 (at the level of this distributor) locked;

- in the second position is the connection between the lines 23 and 28 made and the line 22 (at the level of this distributor) shut off.

The two positions of the second distributor 8 result accordingly as follows:

- In the first position there is the action of the spring

45 on the two cylinder-piston devices 43 and before, the connection between lines 30 "and is established and line 50 (in the level of this distributor) locked;

- in the second position is the connection between the Lines 30 and 50 made and line 31 (in Level of this distributor).

Finally, the following results accordingly in the two positions of the third distributor 9:

- In the first position there is a connection between the Lines 31 and 33 are made and line 36 (in Level of this distributor) locked;

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- ίο -

- In the second position a connection is established between the lines J> 1 and 36 and the line 33 is shut off at the level of this distributor. Any control or actuation element 51 (in this case a manual element) is also attached to this third distributor 9.

Finally, it is important to state clearly that the maximum power of the engine 1 is below the sum of the maximum powers required for driving the Pumps 2, 3 »4 and 5 are required.

The graph in FIG. 2 illustrates the zones of change in the pressure p _{1QJ prevailing} in the line 22 at the inlet of the circuit 10, specifically as a function of the values of the pressure P ₁ ^ s in the line 33 at the inlet of the circuit 11 prevails.

Two first sections of the straight lines AB and BC, which intersect at B and of which the straight line AB is parallel to Op. And the straight line BC is parallel to Op ₁₀ , limit the maximum delivery pressures of pumps 2 to 5. The pressures

2 pA and pC at A and C are, for example, 320 kgp / cm. Two other straight line sections also intersect in the zone OABC at point D, the straight line DE being parallel _{to Op 11} and the straight line DF being _{parallel to Op 10.} Another straight line segment GH is parallel to DF and corresponds to a pressure pH that is greater than pF but less than pC. Finally, two straight line _{sections which are inclined towards Op lo} and Op ₁₁ extend on the one hand (JKG) from section AB to point G and on the other hand (KLM) from point K, which lies on straight line JG, to point M, which is on the straight line BC is located. It should be noted that ED the

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Section BC at N and PD intersects section AB at P. The different straight sections delimit different zones in terms of their extensions. The pumps 2, 3, 4 and 5 have the capacity Q _2, Q ₃ ^ Qj, respectively, "Q ₁ - ₉ wherein the areas correspond to the .Förderkapazitäten indicated below puncture phases.

The cylinder-piston devices exist in a classic solution 39 and 44 not:

- Zone EDPO, (Q ₂ + Q,) feeds circuit 10, (Q ^ + Q ₅ ) feeds circuit 11 (distributor 9 in its first position);

- Zone AEDP, Q ₂ feeds circuit 10 alone, (Q ₁₁ + Q ₅ ) feeds circuit 11; ■

- Zone NCPD, (Q ₂ + Q ₅ ) feeds circuit 10, Q ₅ only feeds circuit 11;

- PDNB, Q ₂ feeds circuit 10 and Q ₁ - feeds circuit 11.

The proposed solution takes into account sections JG and KM. Consequently (when setting the distributor 9 in its second position) these sections correspond in the following to the relationships:

- JG of the equation p _1Q χ (Q ₂ + Q,) + P ₁₁ χ (Q ₁₁ + Q) = P (1) where P is the maximum power of the engine 1;

the equation p _1Q χ (Q ₂ + Q ^) + P ₁₁ χ Q = P (2)

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These two equations mean: 1. That before the production connection of the pump 4 (line 30) with the container 6 (by means of the second distributor 8) the sum of the outputs of the pumps 2 to 5 (product of the Pressure through the capacity) is equal to the maximum power P of the engine 1, and 2. that after the production of the Delivery connection of the pump 4 to the container 6, but before a delivery connection of the pump 3 is established with the container 6, the sum of the outputs of the pumps 2, 3 and 5 is still P is the same.

Finally, in this proposed solution, a distinction is made between the following zones:

- Zone AJGHO, (Q ₂ + Q,) feeds circuit 10 and (Q ₁ ^ + Q ₅ ) feeds circuit 11;

- Zone HGKMC, (Q ₂ + Q ₅ ) feeds circuit 10 and Q ₅ only feeds circuit 11;

- Zone JBMK, Q ₂ feeds circuit 10 and Qj- feeds circuit 11.

If Q, = Qi ₁ = Q _c and if Q ₀ = 3 Qz 1st, one puts 345 23

notes that the proposed solution increases the feeding capacity of districts 10 and 11, which are correspondingly the same:

- For the circle 10 an increase of 33% on the hatched zone AJKLE,

- for circle 11 an increase of $ 100 on the hatched Zone DGHF,

and this in areas of higher pressures.

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In order to be sure that in each of the puncture cases the sum of the drive powers of the pumps is at most equal to the maximum power P of the motor 1, one is actually forced to - with the classical 'solution - the pressures of the values p "for p _1Q and p _{To limit p} for P ₁₁ , so that one can achieve the straight line segments JG and KM for the circle 10 and GH for the circle 11 with the proposed solution, thus a larger range of variation of the pressures. ■

It should be noted that equations (1) and (2) can still be written as (Ibis) and (2bis) as follows:

^p ll ^{+ ap} 10 ^{= A} (ibis)

P ₁₁ + bp ₁₀ = B, (2bis)

From (2bis) and (2bis) it is easy to obtain the values corresponding to the sections of the cylinder-piston devices 38, 39, 43 and 44:

S ₃₈ Zs ₃₉ = b

Sjfij / Sjjj = a

It is of course to be understood that the third distributor 9 - as illustrated - is arranged in its second position, the pumps then only feed district 10.

It is also noted that in general the second Distributor 8 connects the delivery of the pump 4 to the reservoir or container 6 before the first distributor 7 in turn the delivery of the pump 3 with the container 6 connects what

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through the choice of the properties of the cylinder-piston devices to control the distributors 7 and 9 and the springs 40 and 45 takes place.

In short, if the circuits 10 and 11 are fed separately (the third distributor 9 is in its first position), the proposed solution enables a gain in capacity for the functions corresponding to the shaded areas in the diagram shown in FIG. In the example illustrated, the capacity gains are 33% and 100% for circuits 10 and 11, respectively. It is therefore evident that the adoption of the proposed solution allows a considerable increase in the efficiency of the feeder and this entirely while maintaining the The fact that the value P of the maximum power of the engine is not exceeded.

The invention is not limited to just that which is explained and illustrated Embodiment limited, but there can be numerous modifications within the scope of the invention be made.

It goes without saying that the term "distributor" (7, 8 or 9) chosen in the description is broad Meaning has been selected and each distribution valve denotes that the fluid or the flow liquid in a predetermined selected direction conducts, the valve practically through both a slide manifold and a controlled flap valve can be executed.

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Claims (4)

Claims .j Device for feeding two consumption circuits with pressurized fluid containing: - a fluid container; - a first group of pumps, each with a constant capacity; - a first consumption circuit; - a first feed line, which has a first pump, which belongs to the first pump group, connects to the first consumption circuit; a first two-position manifold arranged in the first feed line, which in its first Position the port duration of the first feed line and in its second position the production of a Connection of part of the first feed line between the first pump and the first Manifold is located with which ensures the container; - a second group of pumps, each with a constant capacity; - a second consumption circuit; a second feed line connecting a second pump belonging to the second pump group to the second Consumption line connects; 509831/0303 - A arranged in the second feed line second manifold with two positions, which in his first position the port duration of the second feed line and in its second position the production a connection of part of the second feed line extending between the second pump and the second manifold is located with the container ensures; - a third manifold with two positions, located between the second manifold and the second Consumption circuit is arranged in the second feed line; - A connecting line that connects the third distributor with part of the first feed line, which is located located between the first distributor and the first consumption circuit connects, while the third Manifold in its first position the connection between the second manifold and the second Consumption circuit and in its second position the connection between the second distributor and the Connecting line produces and at its level the part of the second feed line that is directly connected to is connected to the second consumption circuit, shuts off, characterized in that a first and second control means (38, 39) and a first feedback element ⁽² JO) are attached to the first manifold (7), wherein the first and the second control member are each of the first return member opposing action, the action and this return 509831/0303 organ has an effect that tends to make this first ■ Move distributor to its first position while third and fourth control organs (43 and 44, respectively) as well as a second return member (45) on the second manifold (8) ■ are arranged, of which the third and fourth Control organ counteract the action of the second return organ, which has an effect, which tends to slide this second manifold into its first position, that a first control line (41) between the first distributor (7) and the first consumption circuit (10) the included part (22) of the first feed line connects to the first control element (38), that a second control line (42) between the second distributor (8) and the. third distributor (9), holding part (31) of the second feed line connects, that furthermore an additional line (46) between the first distributor (7) and the first consumption line (10) contained part (22) of the first feed line with that between the second and the third distributor (8 or 9) contained part (31) of the second feed line connects, in this additional line a reciprocating valve (47) is arranged, that also a third control line (49) between the second and the third manifold (8 and 9) included part (31) of the second feed line with the third control organ (43) connects, that a fourth control line (48) connects the output of the valve (47) with the fourth control member (44) and 609 8-31 / 0303 that the pumps (2, 3, 4 and 5) of the first and second Pump groups are arranged on a single drive motor (1), the maximum power of which is below the sum • the maximum performance of the various pumps. 2. Device according to claim 1, characterized in that the first and the second control member is each formed by a cylinder-piston device and that the ratio of the sections of these cylinder-piston devices (S38 / S39) is equal to the ratio 1 ( C _p + C,) / C _R 1 of the sum of the cubic capacities of the pumps of the first group and the sum of the cubic capacities of the pumps of the second group, which is correspondingly reduced by the size of the cubic capacity of the second pump of this second group. 3. Device according to claim 1, characterized in that the third and fourth control members (43 or 44) are each formed by a cylinder-piston device and that the ratio of the sections of these cylinder-piston devices (S43 / S44) is equal to the ratio J ″ (C _ij + C _l -) / (C ₂ + C) 1 of the sums of the displacements of the pumps of the second and the first groups. 4. Device according to claim 2, characterized in that that the third and fourth control members (43 and 44) are each formed by a cylinder-piston device and that the ratio of the sections of these cylinder-piston devices (S43 / S44) is equal to the ratio KCjj + CpO / iCp + C-,)! the sums of the displacements of the pumps the second or the first group. S09831 / 0303 .19 · Blank page