DE2342020A1 - PRESSURE REGULATING VALVE - Google Patents

Description

The invention relates to a pressure regulating and shut-off valve and relates in particular to a lightweight pneumatic pressure regulating valve in a compact design with high operational safety and with a minimum of moving parts.

Hydraulic pressure systems have a wide field of application in aircraft and other vehicles found where the requirement for the lowest possible weight without loss of power and Reliability must be met. Most of the time, remote control of such systems is under variable load conditions one or more pressure regulating valves required. For example, airfoil de-icing systems are used in air jet aircraft often taken with the turbine engines Bleed air operated. To compensate for fluctuations in the thrust lever positions and icing conditions and to enable control of the system from the crew compartment, a pressure control valve is required to control the bleed air.

The prerequisites for the suitability of a pressure control valve for use in aircraft on-board systems are operational safety,

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light weight and small dimensions. Furthermore, such a valve should preferably work automatically and • as a supplier of the necessary to open and close the valve actual force using the pressure present in the system itself.

The invention is based on the object of a pressure control and Create a shut-off valve that acts as a shut-off valve or as a pressure control valve to maintain a constant Pressure to work.

The pressure control and shut-off valve improved according to the invention combines the features of increased operational safety, minimal weight and dimensions. It has only a single moving component, which is both the shut-off is also able to control the pressure regulation function.

The pressure control and shut-off valve according to the invention has a housing with inlet and outlet openings, in which along the housing axis and between the inlet and outlet openings, a valve carrier is arranged, which with the housing a forms a substantially annular passage. A shut-off sleeve or valve slide is slidably mounted on the valve support, which is movable towards and away from the outlet opening and for regulating the flow through the passage directed flow cooperates with a seat formed on the housing. The change in position of the shut-off sleeve takes place with a first and a second pressure control chamber, the are pneumatically separated from each other by sealing rings. One of the chambers is in communication with the pressure on the outlet side and is located on one side of a piston formed integrally with the shut-off sleeve, while the other is Chamber is located on the other side of the piston and, if necessary, to the outside air or to one of the inlet pressure actuatable pressure regulator can be connected. When connected to the outside air, the shut-off sleeve is in the closed position

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234202Q

moves, while when connected to the pressure regulator, the position of the shut-off sleeve is controlled and at the outlet opening a predetermined pressure is maintained.

The invention is described below with reference to schematic drawings an exemplary embodiment explained with further details. In the drawing shows:

Fig. 1 is a section in the axial direction through a pressure control ■ and shut-off valve according to the invention, from which the position of the sliding shut-off sleeve at closed valve can be seen,

Pig. 2 shows a section similar to FIG. 1, in which the shut-off sleeve is in the position corresponding to the open position of the valve Position is drawn,

Fig. 3 is an end view looking towards the outlet end of the valve shown in Fig. 1,

4 shows a section, on an enlarged scale, through one of the sealing ring arrangements,

5 shows a section, on an enlarged scale, through a further sealing ring arrangement,

6 shows a section, on an enlarged scale, through another sealing ring arrangement and

7 is a flow diagram, partially in section, in which the various components (assemblies) of the in Fig. 1 shown valve assembly are shown.

According to FIG. 1, a pressure control valve built into the line system according to the invention has a housing or

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Jacket 10 with inlet and outlet openings 11 and 12, respectively, which coincide in the axial direction. Although these openings in the example shown have approximately the same cross-sectional area, it is obvious that they should be different if necessary Can be designed size and do not necessarily have to be in the housing axis. The housing can also be designed with a different external shape. However, it is preferably cylindrical, with an extension approximately in Middle part and with smaller cross-section parts to form the inlet and outlet openings of smaller diameter.

Inside the housing 10, a cylindrical support or guide rod 13 is coaxial with the valve axis for support a valve control and shut-off device 14 stored. Between the device 14 and the housing 10 is an annular one Plud passage 15 formed. From Fig. 3 it can be seen that that this carrier 13 is supported along the housing axis by two radially extending arms 16 and 17 and by a strut 18 is supported.

In the housing 10 on the carrier 13 is a displaceable in the axial direction extending collar 19b received, which has an annular part 19a in the form of an inverted truncated cone of an actuating piston or valve slide 19 wearing. Starting from the outer circumference of the part 19a, a extends towards the outlet opening and parallel to the housing axis cylindrical sleeve 20, the free end of which cooperates with an annular valve seat 21 formed in the housing 10 and is sealed inwardly against a conical wall 22 formed in one piece with the carrier 13 to with the piston part 19a to form a control pressure chamber 23. In the closed and partially open position of the valve, the sleeve 20 is sufficient on the wall 22 also into the passage 15, so that the Limiting or regulating the flow in the passage as required. In the open position of the valve, this sleeve is so far withdrawn that they the passage 15 only to a small extent or not blocked at all.

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On the other side of the actuating piston 19 is a reference pressure chamber from the piston part 19a and a closing bell 25 24 formed. The final bell 25 has a symmetrical at the end of the carrier 13 received hollow arched truncated cone-shaped end piece 25a and a cylindrical wall part 25b, which engages the inlet end of the sleeve 20 and is sealed against it. The side facing the outlet this closing bell is the actuating piston 19 opposite and the radius of the cylindrical wall portion 25b of the The closing bell is chosen so that it forms a pressure seal together with the outer circumference of the piston. Between the pressures in the reference pressure chamber 24 and at the outlet opening 12 is via an axial channel formed in the carrier 13 26 Equilibrium established. This axial channel extends from the reference pressure chamber 24 to one outside of the Outlet opening 12 and is open at both ends in order to achieve the desired pressure equality in the reference pressure chamber and in the line downstream of the valve.

To separate the relatively low pressure in the reference pressure chamber 24 from the relatively high pressure in the Passage 15 is between the inner surface of the cylindrical Wall part 25b of the final bell 25 and the outer circumference of the Sleeve 20 a pressure seal arrangement _27 arranged with an expansion ring. In one in Pig. 4 shown preferred embodiment this pressure seal arrangement has a split carbon outer ring 28 and an inner Pefrngsring 29 made of Inconel (trademark), which is inserted into an annular groove 30 on the outer circumference of the actuating piston 19 are. The ring 28 serving as a sealing ring and the ring 29 acting as an expansion ring act in a manner known per se together and form a pressure seal. Due to the comparatively large pressure difference between the reference pressure chamber 24 and the passage 15 ground the rings in sufficiently tight contact with the walls of the annular tube 30 and on the inner surface of the wall part 25b of the final bell pressed so that the desired pressure seal results.

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The sliding and contact surface lying between the sleeve 20 and the conical wall 22 is sealed with a sealing arrangement 31 which is received in a groove 34 formed on the outer circumference of the wall 22. Here the pressure difference between the control pressure chamber 23 and the outlet opening is small and is of the order of magnitude of about 0.105 kgf / cm or less, so that a double-ring pressure seal such as that described above does not produce a sufficient seal. Therefore, here is a three-ring seal arrangement y \. ^w ^ ^{e in} Pig. 5 shown provided. This has two expansion rings 32 which are arranged in the annular groove 34 on both sides of a contraction ring 33. With these rings, a sufficient seal can be achieved even with small pressure differences, since the expansion rings are in all cases forced into close (tight) contact with the cylindrical sleeve part 20 of the actuating piston and the side walls of the annular groove, while the contraction ring 33 presses against the groove base. to prevent air from passing under the expansion rings.

The actuating piston 19 and the sleeve 20 are urged against the valve seat 21 by a helical compression spring 36 which is supported with one end on the frustoconical end piece of the closing bell 25 and on the other end on the base of the actuation piston 19. In order to achieve a pressure seal between the chambers 23 and 24 along the guide rod 13, a cylindrical clamping ring 37 is arranged between the helical compression spring 36 and the collar 19b, with a radially inwardly directed lip of a single carbon contraction ring 38 in close contact the guide rod 1 holds 2 and thereby creates a pressure seal between these components and thus between the pressure chambers (Fig. 6).

The valve is controlled by supplying control pressure to the control pressure chamber 23 via a control loop. The control pressure comes from the pressure system in which the valve

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is installed, and passes through an inlet port 39 in the high pressure inlet-side part of the passage 15 and a channel or line 40 in the strut 18 in the control pressure chamber 23. As can be seen in Fig. 7, the control loop is from the inlet port 39, composed of a flow line 41, a pressure regulator 42, a flow line 43> a solenoid-operated valve 44 and the line 40.

The high pressure picked up at the inlet opening 39 reaches the pressure regulator £ 2 via the flow line 41. This can regarding It may be conventional in structure and operation and includes a housing 45 with a cylindrical inlet chamber 46 and a cylindrical outlet chamber 47. The two chambers coincide in the axial direction and are with each other connected via a valve opening 48, which to limit the flow between the chambers at least partially with a frustoconical closure member 49 can be blocked. The closure member 49 is supported on a valve stem 50 which is in the axis of the valve opening 48 and the two chambers is arranged. The other end of the outlet chamber 47 is formed by a membrane 51 which has a central recess for receiving it the other end of the valve stem 50 has. This The end of the shaft is conical and forms a needle valve. The membrane 51 is on an adjustable disc supporting helical compression spring 52 urged inwardly in the direction of the outlet chamber 47. To change the from of the helical compression spring 52 exerted on the diaphragm 51 the disk 53 is laterally adjustable with a machine screw-nut unit 54. One located in the inlet chamber 46 additional compression spring 46a engages the rear of the closure member 49 to engage the valve stem 50 to hold with the central recess of the membrane 51. An additional regulation option is with a pressure reducing valve (Overpressure valve) 55 created with which the outlet chamber 47 can be vented when its pressure is a predetermined Il level exceeds.

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When the pressure regulator 42 is in operation, fluid under high pressure enters the inlet chamber 46 via the fluid line 41. The helical compression spring 52 initially urges the closure member 49 into the open position so that the fluid under high pressure flows from the inlet chamber 46 into the outlet chamber 47 can. With increasing pressure in the outlet chamber

47 counteracts the Plud of the helical compression spring 52 and finally pushes the diaphragm 51 to the outside, so that the valve stem 50 and closure member 49 the passage (valve opening)

48 can partially block. As a result, the pressure in the outlet chamber 47 is reduced until finally a state of equilibrium is reached, the pressure prevailing in this state from the force exerted by the helical compression spring 52 and thus depends on the setting of the adjusting screw (machine screw-nut unit) 54. Should As the pressure in the outlet chamber 47 continues to rise, a point is finally reached at which the diaphragm 51 from the tapered end of the valve stem 50 releases so that the. central recess closed by the valve stem until then is open in the diaphragm and flow from the outlet chamber 47 through vent holes in the housing of the pressure regulator into the Ambient air can escape.

The pressure set in the outlet chamber 47 is fed via the positive line 43 to the valve 44, which in structure and Operation can be conventional. The main component of this valve is an electric magnet (2JxQe) on which, by actuating a sliding armature 57, connects the positive line 40 to the positive line 43 or via, as required a ventilation opening 58 connects to the ambient air. The sliding armature 57 is away from the spool 56 from one Helical compression spring 59 urged outward and has at its outer end a reduced diameter portion, the penetrates into a cylindrical valve chamber 61 and engages a spherical closure member 60 arranged therein. Both ends of this valve chamber are reduced in diameter,

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so that opposing valve seats for the spherical closure member are obtained, which is from a in the compression spring 62 arranged in the valve chamber is urged against the end of the sliding armature 57.

If the coil 56 is energized to actuate the valve 44, the sliding armature 57 moves under overcoming the force of the compression spring 59 back so that the compression spring 62 the spherical closure member 60 against the valve seat on the left side of the valve chamber 61 able to push. This opens the opening on the right side of the chamber, so that pressure comes out of the pressure regulator 4_2 can get into the Fludle'itung 40. In the opposite case, when the coil 56 is not energized, the compression spring 59 urges the spherical closure member against the valve seat an.der right side of the valve chamber and the flow line 40 is Relieved to the ambient air via the opening on the left-hand side of the chamber and via the ventilation opening 58. From it it follows that the valve 44 supplies the control pressure chamber 23 with the set (stabilized) pressure when the coil is energized and this chamber is relieved to the ambient air when the coil is de-energized.

In operation, the pressure control valve according to the invention is capable of each to work as required in such a way that it either completely interrupts the flow when the solenoid valve _44 is switched off or when the solenoid valve 44 is actuated, the flow is regulated to a predetermined pressure level. In the former If the solenoid valve 44 is not actuated, the control pressure chamber 23 is vented to the ambient air, so that the pressure on the outlet side supplied to the reference pressure chamber 24 via the channel 26 and that exerted by the compression spring 36 Force the actuating piston 19 against the valve seat 21 able to move until the cylindrical wall part has effectively closed the passage 15. In the second case, calls the actuation of the solenoid valve 44 in the control pressure chamber causes the pressure to rise to that set on the pressure regulator 4.2

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Pressure level. If the pressure supplied to the reference pressure chamber 24 is lower than that from the pressure regulator into the control pressure chamber 23 delivered pressure, the actuating piston 19 and the sleeve 20 open the passage 15 ,. around the outlet side Increase pressure. If the pressure in the reference pressure chamber is greater than the pressure in the control pressure chamber 23, shifts the actuating piston 19 towards the valve seat 21 to narrow the passage 15 so that less fluid can pass. In its open position, the valve thus effectively regulates the outlet pressure to compensate for both load and supply fluctuations.

Although the invention has been explained using a valve that is used to control pneumatic pressure in an aircraft is determined, it is obvious that an application for controlling other types of pressure medium is also possible. In addition, the wall 19a of the actuating piston and the End piece 25a of the final bell, which is designed as a frustoconical Cylinders are formed, as well as the conical wall 22 with other shapes and dimensions executable without would go beyond the scope of the invention. For example the piston wall 19a and the wall 25a of the closing bell could have flat (planar) end pieces and the wall 22 could as be designed disc-shaped component.

The invention thus creates a pressure control valve of low Weight with which to maintain a constant outlet pressure even with changing supply and Effective loading of the fluid flow in a positive pressure system can be modulated. Bas valve is ideally suited for use in aircraft on-board systems, as there is no external force required, has a minimal number of moving parts, has a very low weight and has a compact design is executed.

The invention is not restricted to the above exemplary embodiment, but rather in a variety of ways within the framework of this basic idea Way modifiable.

4 0 9 S 1 1 / CH 1 2 / claims

Claims (12)

EXPECTATIONS 1.1 pressure control valve, characterized in that inside a housing (10) with an inlet (11) and an outlet opening (12) along the housing axis an elongated guide rod (13) is arranged, which with devices (16,17,18) is attached to the housing (10) and a valve assembly (19 »22) carries which with the housing (10) a substantially annular passage (15) forms, and that im Housing (10) an annular valve seat (21) is formed, · wherein for the valve arrangement (19, 22) one with the guide rod (13) integrally formed annular fixed wall (22) which forms an annular opening with the valve seat (21) forms, continues to be displaceable on the guide rod (13) accommodated actuating piston (19) with an annular end wall (19a) and a sleeve (20) carried by this, which, in cooperation with the wall (22) and the valve seat (21), regulates the fluid flow through said opening, wherein the end wall (19a) of the actuating piston (19) and the sleeve (20) with the wall (22) a control pressure chamber (23) form, also a on the guide rod (13) mounted closing bell (25) with one of the end wall (19a) of the Actuating piston (19) overlapping and with this a reference pressure chamber (24) forming cylindrical part (25b), furthermore a channel formed in the guide rod (13) (16) for connecting the pressure prevailing at the outlet opening (12) to the reference pressure chamber (24), as well as one of the Inlet pressure actuatable device (4,2) with which in the control pressure chamber (23) build up a predetermined pressure lets to change the position of the actuating piston (19) and the sleeve (20) and thereby flow through the 4098 1 1 / 0Λ 12 / 2 ■ '- ^ - 43 145 to control said opening and at the outlet opening (12) a maintain a predetermined pressure. 2. Pressure control valve according to claim 1, characterized in that the device (£ 2) for generating a predetermined pressure in the control pressure chamber (23) is a pressure regulator through which at least part of the at the Inlet opening (11) prevailing pressure on the control pressure chamber (23) is transferable. 3. Pressure control valve according to claim 1, characterized in that g e k e η η ζ It is ensured that the control pressure chamber (23) is relieved of pressure to the ambient air with a control valve (44) if necessary leaves to completely close the passage (15) with the actuating piston (19). 4. Pressure control valve according to claim 3> c & by g e k e η η ζ e i chne t that the control valve (Φ4) to electrically operated solenoid valve. 5. Pressure control valve according to claim 3, characterized GEK e η η - characterized in that the actuating piston (19) is urged to close the said opening by a compression spring (36) normally to the outlet opening (12). 6. Pressure control valve according to claim 1, characterized in that g e k e η η, 'That the outlet opening (12) lies in the axis of the housing (10) and with a smaller diameter than this is designed so that the housing (10) at one end has a smaller diameter part on which the outlet opening (12) is formed, and that the cylindrical wall part (20) of the actuating piston (19) with the diameter smaller part of the housing (10) cooperates in regulating the flow through the passage (15). 409811/0412 43 145 7. Pressure control valve according to claim 1, characterized in that the closing bell (25) is a frustoconical Has end piece (25a) which is attached centrally to the valve guide rod (13). 8. Pressure control valve according to claim 1, characterized in that the pressure chambers (23,24) by a Sealing arrangement (^ 7,3J.) Pneumatically separated from each other are. 9. Druckregelv.entil, characterized in that in a substantially cylindrical housing (10) with an inlet (11) and one with this in congruence Outlet opening (12) an axially extending guide rod (13) is supported that at the inlet side End of a hollow domed bell (25) with a, coaxially with the housing (10) and with this an annular passage (15) forming / wana (~ 25B; attached is that in the housing (10) an annular valve seat (21) is formed, with which one with the guide rod (13) near its outlet-side end integrally formed stationary, annular end wall (22) one in the passage (15) lying opening forms that on the guide rod (13) between the closing bell (25) and the end wall (22) a valve slide (19) is slidably received, the one essentially radially directed wall (19a) and on the outer circumference of which has a cylindrical wall part (20), wherein the wall part (20) is guided telescopically displaceably on the inner surface of the wall (25b) of the closing bell (25) and is sealed against this and engages over the end wall (22), and wherein the valve slide (19) with the end wall (22) a control pressure chamber (23) and, with the closing bell (25), a reference pressure chamber (24) forms that a channel (16) formed in the guide rod (13) leads to the outlet (12) The prevailing pressure on the reference pressure chamber (24) transmits, and that can be actuated by the inlet pressure / 4 409811/0412 / - 4 ^ 145 Device (4_2) in the control pressure chamber (23) a predetermined Can generate pressure to change the position of the valve slide (19) and thereby flow through the to control said opening and at the outlet opening (12) maintain a predetermined pressure. 10. Pressure control valve according to claim 9 »characterized in that the valve slide (19) by a device (36) is normally pushed into the closed position, and that the control pressure chamber (23) with a If necessary, relieve the control valve (44) of the ambient air lets the valve slide (19) in the fully closed position to move and interrupt flow through the valve. 11. Pressure control valve according to claim 10, characterized in that g e k e η η, that the pressure chambers (23,24) are pneumatically separated from one another by a sealing arrangement (^ 7 ».31.) are. 12. Pressure control valve according to claim 11, characterized in that the sealing arrangement (32.) ^e ^ - ^{n on the} valve slide (19) mounted sealing member which the valve slide (19) against the cylindrical V / and (25b) of the closing bell (25) seals in the area of low pressure differences and is composed of a tube (34) formed in the valve slide (19), two expansion rings (32) and a contraction ring (33), the hinge (32, 33) in the groove ( 34) are received and wherein the contraction ring (33) is arranged between the expansion rings (32) and in contact with the base of the groove (34) and the expansion rings (32) engage the wall (25b). 409811/0412