FR2480871A1 - PRESSURIZED FLUID DISTRIBUTION CIRCUIT - Google Patents

Abstract

THE INVENTION RELATES TO A PRESSURIZED FLUID DISTRIBUTION CIRCUIT BY MEANS OF TWO PUMPS 1 AND 4, TO A USER CIRCUIT 9, TWO DISTRIBUTORS 3 AND 7 BEING PLACED BETWEEN THESE PUMPS AND THIS CIRCUIT AND ACHIEVING IN THEIR FIRST POSITION THE CIRCUIT POWER SUPPLY, INSULATING THE CORRESPONDING PUMP CIRCUIT IN THEIR SECOND POSITION. THE BODIES OF THE FIRST AND SECOND DISTRIBUTORS, AS WELL AS THEIR MOVABLE ORGANS, ARE IN RELATION TO ONE OF THE OTHER 20, RESPECTIVELY, WHEREAS THE CONTROL DEVICES OF THE FIRST AND SECOND DISTRIBUTORS REALIZE A DISTRIBUTION IN THE TIME OF THESE DISTRIBUTORS. FROM ITS SECOND TO ITS FIRST POSITION. ONE APPLICATION IS THE OBTAINING OF A SATISFACTORY CONTROL PRECISION OF A HYDRAULIC MOTOR ORGAN.

Description

Fluid distribution circuits are already known.

  under pressure, in which a circuit of use can be

  supplied by a source of pressurized fluid which is specially

  affected, and possibly by one or more other sources that are not permanently assigned

  for certain periods of time.

  In order to obtain a satisfactory accuracy of the control of the supply flow rate of the use circuit, it is necessary to be able to control the entire range of flows, and in particular

  to be able to fine tune the value of small flows.

  For this purpose, when the total flow is a

  posite constituted by several initially distinct rates, we begin to feed the circuit of use, only by only one of these distinct flows, which we know how to control

  fine, for, only after, add the other flows.

  The invention proposes a provision which makes it possible to

  dye this purpose, this simply, reliably and inexpensively, by means of two distributors drawer grouped in one

  body and having a single drawer.

  The invention therefore relates to a distribution circuit

  pressurized fluid composition consisting of: - at least one use circuit, - at least first and second pressurized fluid sources each provided with a discharge pipe, said first and second discharge pipes, respectively, a first fluid dispenser which is arranged on

  the first discharge pipe and comprises at least two

  corresponding positions, the first position, to the communica-

  tion of said first discharge convection with said at least one

  circuit of use, and, the second position, to the setting

  communicating this first discharge duct with a second use, such as a fluid reservoir, other than that of said at least one utilization circuit, a connecting duct connected to the second duct of

  repression and cooperating in linking this second

  at least one circuit of use,

  - a non-return valve which is arranged on this

  connection-du- tion and whose function is to allow the possible passage of the fluid only to said at least one use circuit, - a second fluid distributor which is disposed on the second discharge pipe and comprises at least two

  corresponding positions, the first position, to the setting

  communication of the repression of the second source of fluid under

  pressure with said at least one circuit of use through

  intermediate of said connecting duct, and, the second position, to placing the second discharge duct in communication with a third use, such as a fluid reservoir, other than

  that of said at least one use circuit.

  The bodies of the first and second distributors, as well

  their movable organs are interdependent with one another, respec-

  whereas, however, each of those first and second

  scorers is of the progressive type, allowing a gradual transition between the configurations corresponding to these first and second

  positions, and, that the control devices of the first and second

  distributors are hitched to each other so as to

  a time lag in the passage of each of these distri-

  scorers from his second to his first position.

  Preferably, the following provisions are furthermore adopted: the setting up of the second distributor in its first position is fully realized only after

  the full implementation of the first distributor in its first

  re position; the bodies of the first and second distributors are

  consisting of a single body within which a single drawer

  that is movably mounted and constitutes said movable members of the first

  first and second distributors - the first and second distributors are of the

  sliding drawers, their bodies including first and second

  main throats which are adjacent to first and second auxiliary grooves, from which they are separated by

  first and second partitions of said bodies, respectively,

  while the first and second discharge ducts

  in the first and second main throats, respectively

  first and second communication grooves are formed in the first and second drawers and are delimited, the first comedication groove by two first direct and opposed shoulders, and the second communication groove by two

  two direct shoulders and opposes, respectively, that the first

  first and second positions of the first and second distributors correspond, the first positions available to the first and second direct shoulders opposite the first and second

  elect, respectively, the sixteen positions to be

  tion of the aforesaid and the costs of cos-unication in re-

  with respect to the said first and second partitions, respectively, to enable the communication of the main and auxiliary throats of the main and auxiliary throats of the two main and auxiliary throats;

  respectively, and that the transverse faces delimiting the first

  the first direct shoulder and the opposite second shoulder are

in opposite directions

  the deu-xibs position of each of the first and second

  ms distributors corresponds to the placing in communication of the respective first and second discharge ducts with a discharge tank, while a supply duct connects the first delivery duct to said at least one use circuit, that the connecting duct is connected to said supply duct, and

  that the first position of each of the first and second

  scorers corresponds to the closure by this distributor of the first and second discharge ducts, respectively - a third distributor with at least two positions is placed on the second discharge duct between the connection connection in communication of the second delivery duct with said at least one utilization circuit and the second source of fluid under pressure, while a conduit connects the third distributor to another use circuit, the two positions of the third distributor corresponding, the first position, to the commmunication of the two sections of the second conduit of

  connected to this third distributor, and the second

  position, the communication of the section of the second discharge conduit connected to the second source of pressurized fluid with said conduit connecting the third distributor to said other circuit of use. The invention will be better understood, and features

  and their benefits will become apparent during the description of

  an embodiment given below by way of example.

  It is understood that the description and the drawings are not

  given as indicative and not limiting.

  Reference will be made to the accompanying drawings in

  which: - Figure 1 is a diagram of a distribution circuit according to the invention; FIG. 2 repeats the diagram of FIG. 1, distinguishing it and showing a schematic section of a distributor assembly used in the circuit; and - Figure 3 is a partial section of the assembly

distributor of Figure 2.

  FIG. 1 represents a circuit comprising - a first pump 1, whose discharge pipe, called first discharge pipe 2, is connected to a first distributor 3, - a second pump 4, whose discharge pipe, called a second discharge pipe, comprises two sections 5, 6,

  the section 6 connecting a second distributor 7 to a third disc

  tributor 8, and the section 5 connecting the second pump 4 to the third

  second distributor 8, a first use circuit 9 connected to the first discharge duct 2 by a supply duct 10, a connecting duct 11 connecting the section 6 of the second discharge duct to said supply duct 10. , and on which a non-return valve 12 is arranged, allowing the passage of the fluid in the only direction from the section 6 to the supply conduit 10, - a conduit 13 connecting the third distributor 8 to another circuit of use 14, a duct 15 connecting the first distributor 3 to a discharge tank 16, a duct 17 connecting the second distributor 7 to the tank 16, the suction ducts 18 and 19 of the pumps 1 and

  4, respectively, connecting these pumps to the tank 16.

  It is noted in Figure 1 that, on the one hand, the organs

  first and second distributors 3 and 7 are

  as being mechanically coupled to each other by a

  link 20, on the other hand, these distributors are of a progressive type

  sive. These details will be better understood with reference to FIGS.

3 to be commented.

  With reference to FIG. 2, the distributor assembly 21, in which the distributors are integrated, is represented in FIG.

schematic section.

  It is a composite drawer distributor, comprising

  a single body 22, having a bore 23, within which a single slide 24 is slidably mounted, the radial face of the slide 24 being in sealing contact with the bore 23. Ten distinct grooves are provided in the body 22 and open into the bore 23: successively, from left to right, the grooves 26, 27, 28, 29, 30, 31, 32, 33, 34 and 35.

  drawer 24 itself comprises four grooves 36, 37, 38 and 39,

  enumerated in that order, successively, from the left towards

the right.

  It is noted that - the duct 2 opens into the groove 30,

  the distributor 8 has not been represented, the sections

  5 and 6 ducts then being confused and opening into the groove 31, - the conduit It also opens into the groove 31, - the conduit 10 connects the grooves 30 and 33 and the groove 34 to the chamber 40 of smaller section d a cylinder 9,

  a duct 41 connects the groove 35 to the duct 17 (itself

  even connected to the tank 16 via the duct 15 to which it is connected), a duct 42 connects the groove 28 to the duct 10, at a point situated beyond the groove 30, with a check valve. non-return 43 disposed on this duct 10 between the connection of the ducts and 11, and the groove 33,

  a duct 44 connects the chamber 45 of larger section

  cylinder 9 to the groove 27, and

  a duct 46 connects the groove 26 to the duct 15.

  The non-return valve 43 allows the passage of the fluid

  only from the throat 30 to the throat 33.

  The following arrangements are also noted: the grooves 29 and 30 are separated by a first partition 47, the grooves 31 and 32 being separated by a second partition 48,

  the groove 37 constitutes a first communication groove

  delimited by a first direct shoulder 49 (on the left) and a first opposite shoulder 50 (on the right),

  the groove 38 constitutes a second communication groove

  delimited by a second direct shoulder 51 (on the left) and

  a second opposite shoulder 52 (right).

  the grooves 30 and 31 constitute first and second

  main throats, respectively,

  - Gorges 29 and 32 constitute first and second

  9th auxiliary grooves, respectively, - notches are formed in the surface of the radial face 25 of the slide 24 and, opening into the grooves 36, 37, 38, 39 of this drawer, constitute slits of progressivity 53, known

  in the production of fluid dispensers.

  The composite distributor of FIGS.

  in particular the functions of simple distributors 3 and 7 of the

  1. There are three extreme positions of the drawer 24,

  corresponding to the positions 54a, 54b and 54c occupied by the left end of the drawer. At these three extreme positions, correspond the following connections and closures: - at the first position (54a), shown in broken lines the communication, through the intermediary

  groove 36, grooves 26 and 27, and thus, the communication between

  cation conduits 4 and 46, the comunication, through the groove 39, the grooves 33 and 34, o the isolation of the grooves 28, 299 30, 31, 32 and 35 coros grooves 22 which their are, respectively, adjacent - the first position (54b), shown in full lines, o the isolation of the grooves 26, 27, 28, 33, 34 and 35, goz ', the body 22, which is theirs, respectively, adjacent to each other, through communication, through

  of the Serge 37, Gorges 29 and 30, and so, the setting cowiuni-

  Cells 2 and 15, I put in co-awication9 through the intermediary

  throat 38, grooves 31 and 32, and thus, the communication between

  cation sections 5/6 of conduit with the conduit 17 -. the third position (54c), taken up in interritorial lines, o the isolation of the grooves 26, 29, 30, 31, 32, 33, the gor-es of the body 22 which sornt, respectiverent adjjentes, o the setting comunication , through

  throat 369 of the throats 27 and 28, thus, the communication between

  cation of the conduits 42 and 44, where the mi.se in communication, via

  throat 39, grooves 34 and 35, and thus, the communication between

cation of the conduits J0 and 41.

  Naturally, the first and second positions which have just been defi ned correspond to the same positions of the schematic distributors at only two positions 3 and 7.

  of Figure 1. In fact, the distributor 3, in its first po-

  sition, isolates the ducts 2 and 15 from one another, placing them on the contrary in communication in its second position, while the distributor 7, in its first position, isolates the 8.

  lines 6 and 17, on the contrary putting these conduits in communica-

in its second position.

  It should also be observed, with reference to FIG. 3, that if the first extreme position of the slide 24 corresponds to the first positions of the distributors 3 and 7, as well as the

  second extreme position of this drawer 24 includes the second

  my positions of said distributors 3 and 7, an offset has been

  seen so that the implementation of the second distributor 7 of

  his second in his first position is complete only after

  completion of the establishment of the first distributor 3 in

his first position.

  To do this, it suffices to remark that: - the first (50) and second (52) opposite shoulders are spaced apart by a distance D, that the axial faces 55 and 56 of the partitions 47 and

  48 of the body 22, q <are directed to the right, and to which

  are oriented these first and second opposite shoulders 50 and 52, respectively, are spaced a distance L lower

at D,

  - It is evident from these provisions that from the second extreme position of the slide 24, shown in continuous lines in Figure 3, in which there is free communication between, on the one hand, the grooves 30 and 29 (arrow F),

  on the other hand, the grooves 31 and 32 (arrow G), the first shoulder-

  opposite side 50 already closed (excluding the slot of

  5) the randomization 23 at the face 55 of the partition 47 (5fa position of the first opposite shoulder shown in phantom

  Mpus in Figure 3), while a space 58 is still broken

  swum between the position 52a of the second opposite shoulder and the face

axial 56 of the partition 48.

  Furthermore, when the slide 24 is placed in its second extreme position previously defined, the pressurized fluid from the pumps 1 and 4 through the ducts 2 and 5/6, reaches the grooves 30 and 31, and escapes from these grooves to the adjacent grooves 29 and 32; to finally return to the reservoir by the pipes 15 and 17, respectivennt. it must then be observed that the axial faces delimiting the first direct shoulder 49

  and the second opposite shoulder 52 are oriented in opposite directions.

  similar to the axial faces delimiting the first

  opposite shoulder 50 and the second direct shoulder 51.

  Finally, the two positions of the third distributor 8 correspond to: * the first position (represented in FIG.

  connecting sections 5 and 6 of the discharge duct

  pump 4, and, when closing the duct 13, and

  - the second position, the setting in communication of -

  section 5 and the duct 13, and, at the closure of the section 6.

  The functioning of the provisions described will now

to be exposed.

  These arrangements are of interest in the case where a source of fluid, such as pump 4, which normally supplies pressurized fluid to a circuit 14, may occasionally be

  used to supply the circuit (or jack) 9. It is therefore

  posited, in the rest of the presentation, that the third distributor 8

  placed in its first position and that, therefore, the

eg 4 in the section 6.

  When distributors 3 and 7 are placed in their

  second positions, the pumps 1 and 4 are connected to the tank 16.

  The displacement of the slide 24 towards its first extreme position will progressively reduce the passages between the grooves 30 and 29

  on the one hand, and the throats 31 and 32, on the other hand. Thus, the

  Bit of the pumps 1 and 4, initially discharged into the tank 16, will be directed to the circuit 9. If the communication with the tank 16 was interrupted, simultaneously, for the conduit 2 and for the pipe section 6, the entire flow of the pumps 1 and 4 would be directed to the circuit 9, prohibiting any precise maneuver. In the case of the invention described, the communication with the reservoir 16 is reduced and then eliminated for the conduit 2, while being maintained for the section 6 (space 58). Thus, at first, the circuit 9 is powered only by the single pump 1, so with a flow that can be low, and which is, in any case, less than the sum of the flow rates of the pumps 1 and 4

  so that the desired accuracy can be obtained. naturally

  Slopes of progressivity 53 provide their already known function. It is worth noting that the time lag of placing the circuit 9 in communication with the pumps 1 and 4 is

  simply by appropriately choosing the values of the distances

  these D and L. Because it is a single drawer 24 and a body 22 also unique, this choice being made makes it foolproof

  the offset obtained. All this being grouped together in a uni-

  that, compact, and free of settings, so reliable and inexpensive.

  Moreover, it is observed that when the drawer 24 is

  placed in its second extreme position, the hydrodynamic

  the pressure of the fluids passing through the throats 37

  and 38 are opposed and at least partially balanced,

  acting on opposite axial faces of the slide: 49 and 52 on the one hand, 50 and 51 on the other hand. The drawer 24 is, therefore, already partially maintained in balance, and the residual force of its holding in position is low. This also promotes obtaining a good accuracy in the adjustment of the position of the slide, and therefore in the control of the supply of the circuit 9. The invention is not limited to the embodiments described, but covers contrary any variants that might

  their utre brought without leaving their frame or their spirit.-

he

RE V E N D I C A T I ON

  ! - Pressurized fluid distribution circuit consisting of: - at least one use circuit (9), - at least first (1) and second (4) sources of pressurized fluid each provided with a conduit of suppression

  said first (2) and second (5/6) discharge pipes, respec-

  a first fluid distributor (3) which is arranged on the first discharge pipe (2) and comprises at least two

  corresponding positions, the first position, to the setting

  nication of this first discharge conduit with said at least one cicuit ciUtiiiseaion () -, and the second iàm. position, to put in cow.! m. cation of this first feedback pipe with a second use (16), such as a. A fluid reservoir, other than that specified in a user circuit (9),

  - a connection duct (11) connected to the con-

  discharge duct (6) and cooperating in connecting this second discharge duct to said at least one user circuit (9) D a nonreturn valve (12) which is arranged on this

  linking duct (11) and whose function is to enable the

  optionally only fluid to said at least one utilization circuit; - a fluid dispenser means (7) which is disposed on the second discharge line (5/6) and comprises at least two corresponding positions, the first position, at the comununication of the discharge of the second source of pressurized fluid (4) with said at least one utilization circuit (9) by

  the intermediate of said connecting conduit (11), and the second

  sition, the setting up of the second feedback line

  (5/6) with a third use (16), such as a rser-

  see fluid, other than that of said at least one circuit for use

sation (9),

  characterized in that the co-ps (22) of the first and second dis-

  tribe: eu.s7 ainzi that their movable members (24) are integral with each other, respectively, while each of said first and second distributors is of the progressive type (53), allowing a gradual transition

  between the configurations corresponding to these first and second

  position, and, that the control devices of the first and second distributors are coupled to each other (24) so as to realize a

  offset (58) in the time of the passage of each of these

  from his second to his first position.

  2 - Fluid distribution circuit according to the claim

  1, characterized in that the introduction of the second distributor in its first position (56/52) is fully realized after-only the full implementation of the first

  distributor in its first position (55/50).

  3 - Fluid distribution circuit according to any one

  of claims 1 and 2, characterized in that the bodies

  first and second distributors are constituted by a single body (22) within which a single drawer (24) is mounted

  mobile and constitutes said movable members of the first and second

me distributors.

  4 - Fluid distribution circuit according to any one

  of claims 1 to 3, characterized in that the first

  and second distributors are of the sliding drawer type, their body (22) including first (30) and second (31) main grooves which are adjacent to first (29) and second

  (32) auxiliary grooves, from which they are separated by first

  re (47) and two minutes (48) partitions of said bodies, respectively,

  however, the first (2) and second (5/6) refueling

  in the first (30) and second (31) main grooves respectively, that first (37) and second (38) communication grooves are

  arranged in the first and second drawers (24) and are delimited

  the first communication groove (37) by two direct first (49) and opposite (50) shoulders, and the second communication groove (38) by two direct second (5) and opposite (52) shoulders respectively. , that the first and second p-sitions of the first and second

  distributors correspond, the first positions to the

  positioning the first (49) and second direct shoulders (51) opposite the first (47) and second (48) partitions, respectively, and the second positions, at the disposal of said first (37) and second (38) communication grooves facing said first (47) and second (48) partitions, respectively, so as to allow communication of the first main grooves (30) and

  (29), and second main (31) and auxiliary grooves

(32), respectively, and

  that the transverse faces delimiting the first direct shoulder

  (49) and the opposite second shoulder (52) are oriented in

opposite directions.

  - Fluid distribution circuit according to any one

  one of claims 1 to 4, characterized in that the second

  position of each of the first and second distributors

  responds to the communication of the first (2) and second

  (6) respective discharge ducts with a reservoir of

  charge (L), while a supply duct (10) connects the

  first discharge pipe (2) to said at least one circuit for use

  (9), that the connecting conduit (11) is connected to said con-

  feeding duit (10), and that the first position of each

  first and second distributors corresponds to the filling.

  by this distributor of the first (2) and second (6)

repression, respectively.

  6 - Fluid distribution circuit according to any one

  one of claims 1 to 5, characterized in that

  known per se, a third distributor (8) with at least two

  is placed on the second discharge pipe (5/6) between the connection connection (11) of this second discharge pipe (6) with the at least one utilization circuit (9) and the second source of fluid under pressure (4), however

  a duct (13) connects this third distributor (8) to another circuit

  cooking (14), the two positions of the third distribution

  scorer (14) corresponding, the first position, to the setting

  communication of the two sections (5 and 6) of the second

  connected to the third distributor (8), and the second position in the second position, at the placing in communication of the section (5) of the second discharge pipe connected to the second supply source.

  fluid under pressure (4) with said conduit (13) which connects the third

  second distributor (8) to said other use circuit (14).