FR2494350A1 - SAFETY DEVICE FOR THE CONNECTION OF TWO PRESSURE HYDRAULIC CIRCUITS - Google Patents

Abstract

A 12 THREE-WAY VALVE HAS A FIRST WORKING POSITION, IN WHICH A FIRST INPUT 4 COMMUNICATES WITH A SECOND INPUT 5, AND A SECOND WORKING POSITION IN WHICH THE FIRST INPUT 4 COMMUNICATES WITH AN OUTPUT 6 CONNECTED TO A DISCHARGE TANK 7 . THE DEVICE CAN BE USED IN PARTICULAR FOR THE CONNECTION OF A HYDRAULIC CIRCUIT UNDER PRESSURE 2 WITH A HYDROPNEUMATIC ACCUMULATOR 3. WHEN THE CONNECTION BETWEEN THE HYDRAULIC CIRCUIT UNDER PRESSURE 2 AND THE HYDROPNEUMATIC ACCUMULATOR 3, IS RUNNING AUTOMATICALLY, IS INTERRUPTED. WITH DISCHARGE TANK 7. IT RESULTS THAT IT IS IMPOSSIBLE TO DISASSEMBLE HYDROPNEUMATIC ACCUMULATOR 3 WHEN IT IS UNDER PRESSURE. APPLICATIONS: HYDRAULIC INSTALLATIONS, ESPECIALLY INSTALLATIONS INCLUDING A HYDROPNEUMATIC ACCUMULATOR.

Description

The present invention relates to a positive;

  rity for the connection of two pressurized hydraulic circuits comprising:

  first and second inputs which can be resisted

  pectively connected with the two hydraulic circuits under pressure,

  an outlet which can be connected with a water tank

  load, manually operated valve means making it possible to establish the connection of the first inlet with the second inlet and with the outlet,

  a discharge valve suitable for automatic connection-

  the first entry with the discharge tank when

  that the pressure in the hydraulic circuit connected with the first inlet exceeds a preset threshold value, and an emergency discharge solenoid valve capable of establishing

  a communication between the first entry and said reservation

see discharge.

  In known devices of the type which has just been

  described, the manually operated valve means are

  by a pair of independent taps mounted on

  two conduits which communicate respectively.

  one of the two hydraulic circuits with the other circuit

  hydraulic and with the discharge tank.

  This known arrangement, however, has drawbacks.

  nients as well from the point of view of the simplicity of

  the cost and the cost of the facilitation

  tee and. convenience of use, as well as from the point of view

of security.

  In the case, for example, of the application of said

  positive for connection between a hydraulic circuit

  under pressure and a. hydropneumatic accumulator, when

  that we need to disassemble the hydropneumatic accumulator

  installation, it is necessary, with the provisions

  known sitives described above, to carry out two

  successive operations: a first operation which consists

  to close the tap mounted on the connection pipe

  of the hydraulic circuit with the hydropneumatic accumulator

  matic, and a second operation which consists in opening the tap which is mounted on the connection pipe of the

  hydropneumatic accumulator and discharge tank.

  By using the usual devices, there is therefore a risk, given the possibility of forgetting

  to open the connection valve of the hy-

  dropneumatic with the discharge tank, that same

  accumulator is removed while it is under pressure.

  The present invention relates to a device for

  safety for the connection of two hydraulic circuits

  that under pressure, which is free from these drawbacks.

  The device according to. the present invention is charac-

  terrified in. what said manual valve means

  the consist of a three-way valve having a first working position, in which the first inlet is in communication with the second inlet, while the outlet is isolated from the two inlets, and a second working position in which the first inlet East

  in communication with the output while the second in-

  trée is isolated from the first entry and exit.

  The features and advantages of this in-

  vention will emerge clearly from the description which goes

  follow, given here by way of example in no way limited

  tatif, with reference to the accompanying drawings, in which: - Figure 1 is a diagram of a device according to the known technique; Figure 2 is a diagram of a device according to the present invention;

  Figure 3 is a side elevational view of the device.

  positive according to the invention; Figure 4 is a sectional view along line IV-IV of Figure 3 Figure 5 is a plan view of the device of Figure 3;

  Figures 6 and 7 are two sectional views, respectively

  tively along lines VI-VI and VII-VII of Figure 4; Figures 8 and 9 show a detail of the device of Figure 3 in two different operating conditions. Figure 1 shows a safety device according to the known technique, indicated as a whole by 1, for the connection between a pressurized hydraulic circuit

  2 and a hydropneumatic accumulator 3.

  The device 1 comprises a first input 4 re-

  linked to the hydropneumatic accumulator, a second input connected to the pressurized hydraulic circuit 2 and a

  outlet 6 connected to a discharge tank 7.

  The device 1 comprises, on the other hand, two robi-

  nets 8 inserted on two conduits 9 which connect,

  cation the first entry 4 with the second entry 5 and

with exit 6.

  On the connection between the hydropneumatic accumulator

  zO matique 3 and the discharge tank 7 are, on the other hand, interposed a discharge valve 10, able to put in communication. the accumulator 3 with the reservoir 7 as soon as the pressure. in the accumulator exceeds a prefixed threshold value, and an electrovalve 11, also able to put in communication. the accumulator 3 with the reservoir 7 and

  usable for an emergency discharge of the accumulator 3.

  In the conditions of use. normal, the robi-

  net 8 mounted on the connection pipe between the accu-

  hydropneumatic lator 3 and the pressurized hydraulic circuit 2 is open, while the other valve 8 mounted

  on the connection pipe between the hydro accumulator

  pneumatic 3 and the discharge tank 7 is closed.

  When the battery has to be removed

  hydropneumatic, it is therefore necessary to

  carry out two separate successive operations: closing

  procedure of the tap which puts the accumulator 3 in communication with the circuit 2, and the opening of the other tap which

  puts the accumulator 3 in communication with the reservoir 7.

  The use of the two taps 8 however makes the structure of the safety device 1 relatively complex and storytelling. On the other hand, as we have seen, the operations necessary to disassemble the accumulator

  hydropneumatics are relatively long and awkward.

  In addition, there is a risk that the hydropneumatic accumulator

  tick 3, is disassembled while it is under pressure, given that one can forget to open the tap 8 which puts the accumulator 3 in communication with the reservoir 7,

  before disassembling this same accumulator.

  Figure 2 is a diagram of one. safety device

tee according to the present invention.

  In this FIG. 2, the parts similar to those of FIG. 1 are indicated with the same reference numbers. An important difference between the known device illustrated in FIG. 1 and the device according to. the present invention, illustrated in FIG. 2, resides in the fact that the two taps 8 are replaced by a single three-way valve 12, capable of connecting, in a selective manner, the first inlet 4 either with the second inlet 5 , the output 6 being isolated from the two inputs 4 and 5, that is to say with the output 6 of the device, the second input 5 being isolated from the

  first entry 4 and exit 6.

  In accordance with FIGS. 3 to 9, the device 1 pre-

  feels a body 13 with an internal cylindrical cavity

  14 which communicates by its opposite ends with the first

  first entry 4 and with the second entry 5 of the device.

  At the first entry 4, the body 13 pre-

  feel one. threaded connection 15 for fixing the body of

  the hydropneumatic accumulator 3. The end of the

  vity 14 which defines the second entry 5 presents a

  threaded connection for fixing. a connection intended to ensure connection with the hydraulic circuit

under pressure 2.

  The body 13 of the device 1 also comprises,

  a cylindrical cavity 16 whose axis 17 is disposed per-

  perpendicular to the axis of the cylindrical cavity 14.

  Inside the cavity 16 is rotatably mounted, with the interposition of seals 18, a distributor member 19 provided with a portion 20 which passes through the ca-

cylindrical speed 14.

  On one end of the cylindrical body of the rotating distributor member 19 which projects outside the

  body 13, a lever 21 for controlling the movement is mounted

distributor 19.

  The outlet 6 of the device 1 connected to the discharge tank 7 communicates with a. conduit 22 (see Figure 6)

  extending perpendicular to the axis of the cy-

  lindrique 14 and opening onto the wall of this same ca-

  quick, at the height of the portion. 20 from the distributor

  nant 19. _ As also shown in Figures 8 and 9, the

  portion of the body of the distributor 19 which passes through the

  cylindrical hole 14 has a cavity 23 shaped

  such that the section of portion 20 of the distri-

  striker 19 is in the shape of a semicircle.

  Device 1 is externally provided with stops

  34 (see Figure 3) having the function of limiting the

  valve control lever flap 19.

  The lever 21 can be moved between a first end position (illustrated in FIG. 3) and a second end position offset by 900 in a clockwise direction, relative to

  the first end-of-travel position in Figure 3.

  Figures 8 and 9 which represent in cross section

  versale the portion 20 of the distributor 19, show res-

  pectively the latter in the corresponding positions

  tooth at the two end positions of lever 21.

  More specifically, Figure 8 shows a first posi-

  of the dispenser 19, in which the two portions of the cylindrical cavity 14 located on

  two opposite sides with respect to the distributor 19 common

  have intercourse with them, thus establishing a common.

  tion between the hydro-pneumatic accumulator 3 and the circuit 2. Figure 9 shows the distributor 19 in a second working position in which the portion of the cavity

  14 facing the first entrance 4 communicates with the

  duit 22 so as to establish a connection between the accumulator

  hydropneumatic lator and discharge tank.

  The body 13 of the device 1 has, on the other hand, a cavity 24 arranged on one side of the cylindrical cavity

  14 and communicating with the latter.

  The cavity 24 communicates (FIG. 7) with a cavity intended to be placed in communication with the reservoir

  discharge 7 through a cavity 26 in the

  which is housed a relief valve 27, of a type known per se, capable of automatically making the cavities communicate

  24 and 25 as soon as the pressure. inside the accumulator-

  hydropneumatic 3 exceeds a preferred threshold value

xee.

  The device further comprises an electro-

  valve 28 intended to ensure rapid discharge of the battery

  mulator 3. This solenoid valve 28 is capable of bringing into operation

  munication with the discharge tank 7, a passage 29

  (see Figure 7) formed inside the body 13 and common

  screwing, through cavity 24 with cavity

cylindrical 14.

  Naturally, it is possible to provide the discharge valve 27 with one. electromagnet, so as to make it

  also fulfill the function of the solenoid valve 28.

  As can be seen, the device according to the present invention has a simpler and more economical structure than that of known devices and can be controlled in a simpler, faster and safer manner. Indeed, it is possible, by a single maneuver,

  by moving the control lever 21 between its two positions

  end positions, selectively set

  communication between the hydropneumatic accumulator and the system

  pressure cooked 2 or with the discharge tank 7,

  while input 5 is closed automatically.

  Of course, the details of realization can vary within the scope of the invention to a large extent by

  compared to those of the embodiment described and illus-

  very. Thus, for example, in the mounting of the rotary distributor 19 inside the cavity 16, on. may use gaskets of a different type from that of

  seals 18 qai have just been described and il-

  glossy, for example lip seals.

Claims (4)

IONS CLAIMS   1) Safety device for the connection of two pressurized hydraulic circuits, comprising:   first and second inputs which can be resisted   pectively connected with the two hydraulic circuits under pressure, an outlet which can be connected with a discharge tank, valve means with manual control allowing   to establish a connection of the first entry with the se- as entry and with exit,   a discharge valve suitable for automatic connection-   the first entry with the discharge tank when   that the pressure in the hydraulic circuit connected with the first inlet exceeds a preset threshold value, and an emergency discharge solenoid valve capable of establishing   a communication. between the first entry and said reservation   see discharge, characterized in that said manually operated valve means are constituted by a three-way valve (12) having a first working position, in which the first inlet (4) is in communication with the second inlet ( 5), while the output is isolated from the two inputs (4,5), and a second working position in which the first input (4) is in communication with the output 6, while the second input (5) is isolated   of the first inlet (4) and the outlet (6).   2) Device according to claim 1, usable for the connection of a pressurized hydraulic circuit with a. hydropneumatic accumulator, characterized by the fact   that said device has a body (13) provided with a   interior unit (14) which communicates with the first inlet (4), with the second inlet (5) and with the outlet (6), a distributor member (19) mounted rotating inside the   body (13) and able to move between a first position   tion of work, in which the first entry (4) and   the second input (5) communicate with each other, tan-   say that the output (6) is isolated from these inputs (4,5), and a second working position, in which the first input (4) is in communication with the output (6), while the second input (5 ) is isolated from the first inlet (4) and the outlet (6), and a control member (21) of the   movement of the rotary distributor (19) between its different annuities working positions.   3) Device according to claim 2, characterized by   the fact that the internal cavity (14) of the body (13) of the device   positive is cylindrical, the first and second   inputs (4,5) are located at opposite ends of the   said cylindrical cavity (14), the distributor member (19) is mounted rotating about an axis perpendicular to the axis of the cylindrical cavity (14) and has a portion (20) which transversely crosses said cylindrical cavity (14) , the outlet '(6) connected with the discharge tank   (7) communicates with the cylindrical cavity (14) via the   medial of a conduit (22) which opens into the wall of   the cylindrical cavity (14) at the level of the distri-   striker (19), and the portion. (20) of the distributor member (19) which passes through the cylindrical cavity (14) has a cavity (23) adapted to allow communication between the two portions of the cylindrical cavity (14) located on   opposite sides with respect to the distributor member (19) when   that the latter is in its first working position   vail, said cavity (23) being, on the other hand, able to put in communication the portion of the cylindrical cavity (14) facing the first inlet (4) with said conduit (22)   communicating with the output (6) of the device when the   gane distributor is in its second working position. 4) Device according to claim 3, characterized in that the distributor member (19) has a body   cylindrical mounted rotating inside the body of the device   positive with interposition of seals (18) and provided with one end projecting outside the body (13) of the device, and by the fact that said control member is constituted by a lever (21) mounted on the end of the dispensing member which protrudes outside the body (13) of the device.   ) Device according to claim 4, characterized in that it is also provided with stop means (34)   able to limit the travel of the control lever (21).