WO2002091097A1

WO2002091097A1 - Device for supplying a liquid under pressure in a consumer unit

Info

Publication number: WO2002091097A1
Application number: PCT/CH2001/000284
Authority: WO
Inventors: Reto Seitz
Original assignee: Valevo Ag
Priority date: 2001-05-09
Filing date: 2001-05-09
Publication date: 2002-11-14
Also published as: EP1386204A1

Abstract

The invention relates to a device comprising a shut-off device (4) which can be connected to a feeding unit (1) and displaced by means of an actuating device (9), and a throttle valve (6) which is arranged downstream from said shut-off device and which can be connected to a consumer unit (3). Said throttle valve (6) contains a valve seat (20) which is arranged between an input channel (12) and an output channel (13), a closing element (11) which co-operates with said valve seat by means of an elastic support arrangement (18), and at least one throttle channel (30) which communicates with the input channel (12) and the output channel (13). Said closing element (11) is held in an automatically displaceable manner between a closing position in which the flow of the liquid is throttled, and an opening position, according to a pre-determined limiting value of a reduced liquid pressure which gradually builds up in the output channel (13). The output pressure of the liquid builds up, first continuously, to a fraction of the input pressure, and then step-by-step to the level of the input pressure, once the limiting value has been exceeded, thus preventing unacceptable pressure impacts.

Description

Device y.nva feeding a pressurized flid into a consumer unit

The invention relates to a device for supplying a pressurized fluid to a consumer unit, with an Äbsperrororgan connectable to a feed unit, which can be adjusted between a closed position and an open position via an actuating device.

Devices of this type are known, in which the supply of the fluid is in each case via one

Rotary actuator actuated ball valve is controlled. In many areas of application, especially in systems with high operating pressures and / or with relatively large opening cross-sections, the ball valve must be controlled by hand or, in other versions, gradually adjusted from the closed position to the open position using a correspondingly controllable motor to prevent the formation of a impermissibly high flow velocity at the valve outlet, and thus to prevent the occurrence of pressure surges.

The disadvantages of the known devices are essentially to be seen in the fact that a stepwise adjustment of a manually operable valve is one requires some care, the risk of incorrect manipulation, while a gradual adjustment of a valve actuated by an engine requires a relatively complex control device for the engine.

The invention has for its object to provide an improved device of the type mentioned, in which the disadvantages mentioned above do not occur,

This object is achieved according to the invention with the features of claim 1.

The advantages of the invention are essentially to be seen in a simple construction of the device with components which can be produced inexpensively and in the guarantee of a safe, automatic control of the flow of the fluid and in the possibility of retrofitting existing devices.

The device designed according to the invention proves to be particularly advantageous in systems for conveying gaseous fluids. However, it goes without saying that a corresponding device can also advantageously be used in systems for conveying liquid media.

Embodiments of the subject matter of the invention are specified in the dependent claims.

The invention is explained below on the basis of exemplary embodiments shown schematically in the accompanying drawing. Show it: Fig. 1 is a diagram of a one according to the invention

Device comprising a device for feeding a fluid into a consumer;

FIG. 2 shows a detail of a first embodiment of the device according to the invention according to FIG. 1 in a longitudinal section;

3 shows a second embodiment of the device according to the invention in a longitudinal section;

4 shows a modification of the embodiment according to FIG. 2 in a longitudinal section,

5 shows a detail V of the embodiment according to FIG. 4 in a larger representation, and

6 shows a further modification of the embodiment according to FIG. 2 in a longitudinal section,

1 comprises a supply unit 1 for providing a gaseous fluid compressed to a specific storage pressure and a device 2 for supplying the fluid to a consumer unit 3. The supply device 2 contains a shut-off device 4 connected to the supply unit 1 and this via a Connection piece 5 downstream throttle valve 6, which can be connected to the consumer unit 3 via a feed line 7 with a coupling device 8. The shut-off device 4 is connected via an actuating device 9

Closed position and an open position adjustable, the shut-off device 4 can be a ball valve that can be operated manually, via a pedal, via a motor, hydraulically or pneumatically. In the illustrated An assumption is made of a seat valve which can be actuated by means of an electromagnet.

According to another embodiment of the invention, not shown, the throttle valve 6 can be connected to the feed unit 1 and connected upstream of the shut-off element 4, which is accordingly connected to the feed line 7.

2 shows an embodiment of the throttle valve 6 with a valve body 10 and a closure part 11 movably arranged therein. The valve body 10, which has an inlet channel 12, an outlet channel 13 and a bore 14, consists essentially of two housing parts 15 and 16, which are connected by screws 17, the closure part 11, which cooperates with a valve seat 20 delimiting the mouth 19 of the inlet channel 12, is held adjustable in the bore 14 by means of an elastic support arrangement, according to the illustration a spring arrangement 18, between a closed position and an open position. A gas spring or the like can also be used as a support arrangement. be provided, the inlet channel 12 contains a threaded connection for the connecting piece 5, which is connected at the other end, not shown, to the outlet of the shut-off element 4, the outlet channel 13 is provided with a corresponding one

Provide threaded connection for the feed line 7.

According to another embodiment, not shown, the inlet channel 12 and the outlet channel 13 can also be connected to a distribution unit via correspondingly arranged flange connections, the further flange connections for the inlet and outlet of the shut-off element 4 and for the connection to the Feed unit 1 and can have with the feed line 7.

As shown, the closure part 11 is a two-stage piston with a first piston section 21, which has a first pressure surface 23 facing the valve seat 20, and a second, stepped piston section 22, which has a correspondingly smaller second pressure surface 24 facing away from the first pressure surface 23. The piston also contains a through bore 25 penetrating it in the direction of its longitudinal axis L and open towards the mouth 19 of the inlet channel 12, with a section for receiving the spring arrangement 18 supported on the valve body 10. The first piston section 21 is provided with a centrally arranged one for contacting the Valve seat 20 certain graduated end portion 26 executed. The first pressure surface 23 essentially consists of a central partial surface 27 formed on this end part 26 and a peripheral partial surface 28 which is set back relative to this and surrounds the end part 26.

The first piston section 21 is guided in the lower housing part 15 according to FIG. 2 with a seal 31 in a first section 14a of the bore 14. With the valve seat 20, the first pressure surface 23 delimits a first, lower pressure chamber which is open towards the outlet channel 13

33, which communicates with the inlet channel 12 via a throttle channel 30, as shown a transverse bore arranged in the end section 26 and leading into the through hole 25. The second piston section 22 is guided in the upper housing part 16 with a seal 32 in a correspondingly graduated second section 14b of the bore 14. The second pressure surface 24 delimits a second, upper pressure chamber

34, via a connecting channel, as shown is connected to the inlet channel 12 via the through hole 25. The bore section 14a is connected to the surroundings by a compensating bore 29 arranged between the seals 31 and 32. An embodiment is also possible in which the second

Pressure chamber 34 is connected to the inlet channel 12 via a connecting channel, not shown, formed in the wall of the valve body 10. In such an embodiment, the through hole 25 can be omitted.

In the system shown, it is assumed that the fluid present in the feed unit 1 is oxygen or a gas fuel which has a storage pressure of, for. B. can be compressed to 350 bar.

When the shut-off device 4 is closed, the

Closure part 11 of the downstream throttle valve 6 is held on the valve seat 20 in the illustrated closed position by the spring arrangement 18 biased to a specific spring force. When the shut-off device 4 is opened, the gas flows with an inlet pressure corresponding to the storage pressure via the connecting piece 5 into the inlet channel 12 of the throttle valve 6 and through the open through-bore 25 into the second pressure chamber 34. The closure part 11 is accordingly opened by an additional closing force from the to the second

Pressure surface 24 resulting input pressure results, pressed against the valve seat 20. At the same time, part of the gas flows through the throttle duct 30 into the first pressure chamber 33, an outlet pressure being reduced in this and in the outlet duct 13 in relation to the inlet pressure, which acts on the peripheral partial surface 28 of the first pressure surface 23. The outlet pressure of the gas increases during a period of time, which is essentially due to the Cross-sectional size of the throttle duct 30 and by the volume of the consumer unit 3 is determined gradually and continuously until it reaches a predetermined limit which is a fraction, for. B. 80%, corresponds to the inlet pressure.

The pressure surfaces 23 and 24 of the closure part 11 are coordinated with one another such that when the limit value of the outlet pressure is reached, the pressure force exerted on the first pressure surface 23 corresponds to the closing force exerted on the second pressure surface 24 by the input pressure. If the reduced outlet pressure rises above this limit value, the closing part 11 is lifted from the closed position restricting the flow by the correspondingly increased pressure force, the full cross section of the valve seat 20 being released and the inlet pressure of the gas thus also acting on the first pressure surface 23. Accordingly, the closure part 11 is automatically adjusted against the spring arrangement 18 with a lifting force determined by the difference between the pressure surfaces 23 and 24, in which the gas with the outlet pressure in the consumer unit 3, which now increases gradually to the level of the full inlet pressure is fed,

To end the feed process, the shut-off device 4 is closed, the inlet pressure of the gas being reduced accordingly. If the outlet pressure drops below the predetermined limit value, the closing part 11 is automatically reset by the spring arrangement 18 into the closed position which throttles the flow of the gas. The device described allows in a simple manner a safe, automatic control of the flow of the gas to be fed into the consumer unit 3, the throttle valve 6 preventing the creation of impermissible pressure surges and thus avoiding excessive heating of the gas and the installation. An essential advantage of this device is that the throttle valve 6 can be combined with shut-off elements 4 of any type, in particular with valves with short opening times that are common in plant construction.

In the drawing figures, the parts corresponding to the device described above are provided with the same reference numerals.

In the embodiment according to FIG. 3, a throttle valve 40 designed according to the invention and a seat valve 41 serving as a shut-off element are arranged in a common valve body 42 along a longitudinal axis L. The valve body 42 essentially consists of a first housing part 43, a second housing part 44 screwed to it and a cover 45 screwed to the first housing part 43. The throttle valve 40 is formed in the housing parts 43 and 44, which is intended for guiding the closure part 11 , contain stepped bore 14, the first housing part 43 contains an inlet duct 46 and the outlet duct 13 for the gas to be conveyed as well as a housing chamber 47 intended for receiving the seat valve 41, which is closed by the cover 45 and which is connected via a through duct 48 to the in the bore 14 formed valve seat 20 is connected. The inlet duct 46, which in this embodiment opens into the housing chamber 47, can be connected to the feed unit 1 via a connecting line or, as assumed in the present example, directly via a coupling element 50, The seat valve 41, which is of a known design, contains a piston 52, which cooperates with a valve seat 54 delimiting the through-channel 48, and which is held adjustable between a closed position and an open position by a prestressed spring element 53 and by means of a solenoid valve 55 attached to the second housing part 44 , The piston 52 essentially consists of a head part 57 guided in the housing chamber 47 and a shaft 58 which is guided in a bore 56 arranged in the cover 45.

The head part 57 has a stepped end portion 59 that can be placed on the valve seat 54 and an annular surface 65 surrounding it and delimits in the housing chamber 47 a first annular space 60 facing the throttle valve 40, which is open towards the inlet channel 46, and a second annular space 61 facing away from the throttle valve 40 The shaft 58 delimits a pressure chamber 62 facing away from the throttle valve 40 in the bore 56. The annular spaces 60, 61 and the pressure chamber 62 are communicatively connected to one another in a known manner via bores 63 and 64 arranged in the head part 57 and in the shaft 58,

© The executed in a known type solenoid valve 55 includes a 42 screwed to the second housing part 44 of the valve body, surrounded by a magnet coil 70 housing 71, a movably arranged therein magnetizable armature 72 and a closing body 73, which is arranged in a Ge ^'casing part 44 hole 74 and is movably guided in the housing 71 in the direction of the longitudinal axis L. The closing body 73 limits in the

Bore 74 and in the housing 71 a third annular space 66 facing the throttle valve 40 as well as a distant annular space 67 and a pressure space 68, which communicate with one another via a bore 79 and a groove 79a The third annular space 66 is also connected to the second annular space 61 of the seat valve 41 via a connecting channel 69, which is only partially shown in FIG. 3. The closing body 73 acts against a valve seat 75 which delimits a passage 76 to the second pressure chamber 34 of the throttle valve 40 in the third annular space 66. The closing body 73 also has a longitudinal bore 77 which is open towards the passage 76 and opens into a conical seat 78 which is intended to interact with the armature 72.

When the solenoid 70 is not energized, the closing body 73 is held on the valve seat 75 by the armature 72 in the closed position shown. Likewise, the piston 52 of the seat valve 41 is held on the valve seat 54 by the spring element 53 in the closed position shown. When the gas to be conveyed flows into the annular space 60 of the seat valve 41, the piston 52 is pressed against the valve seat 54 by the storage pressure of the gas with a compressive force determined by the difference between the cross-sectional area and the annular surface 65 of the head part 57. The same accumulator pressure acts in the annular spaces 66, 67 connected via the connecting channel 69 and in the pressure space 68 of the solenoid valve 55. Accordingly, the closing body 73 is determined with a compressive force determined by the difference between the largest cross-sectional area and the annular area of the closing body 73 delimiting the third annular space 66 pressed against the valve seat 75.

When the solenoid coil 70 is energized, the armature 72 is lifted off, the closing body 73 being moved into an open position which opens the passage 76 and which prevents the gas from flowing out of the second annular space 62 of the seat valve 41 into the upper pressure space 34 of the throttle valve 40 and into the passage channel 48, and thus causing the piston 52 of the seat valve 41 to be moved into the open position. Accordingly, the gas supply to the throttle valve 40 is released, wherein, as described above, a reduced, gradually increasing outlet pressure is built up in the outlet channel 13, which is gradually increased to the level of the inlet pressure when the predetermined limit value is exceeded.

Numerous modified embodiments of the invention are possible. FIG. 4 shows a throttle valve 80 in which the inlet duct 12 and the outlet duct 13 are connected by a throttle duct 81 which, in contrast to the embodiments described above, is formed in the valve body 10, The throttle channel 81 is formed by two interconnected bores 82 and 83 arranged in the housing part 15. As can further be seen from FIGS. 4 and 5, the housing part 15 can contain a means for influencing the flow-through cross section of the throttle duct 81. For this purpose, an adjusting screw 85 arranged in the bore 83 can be provided, which has a conical seat 84 that can be adjusted against a shoulder of the bore 83. Correspondingly, a finely adjustable throttling of the fluid flow can be achieved through bores with a relatively large diameter.

The device according to the invention can also be designed with two or more throttle valves 6 or 80, which are connected in series with the Äbsperrorgan 4, which allow a corresponding multi-stage increase in the outlet pressure to the level of the storage pressure of the fluid to be conveyed. 6, two throttle valves 6 can be formed in a common valve body 36, which consists of two housing parts 37 and 38. The output is of the first throttle valve 6 connected through a connecting channel 39 to the input of the second throttle valve 6. In the connection channel 39, a reduced, gradually increasing outlet pressure is built up in the manner already described, which is gradually increased to the level of the inlet pressure depending on a predetermined first limit value of, for example, 70-80% of the inlet pressure. In a corresponding manner, a reduced, gradually increasing outlet pressure is also built up at the outlet of the second throttle valve 6 until it corresponds to a predetermined second limit value of, for example, 90% of the inlet pressure of the first throttle valve 6. If the outlet pressure of the fluid exceeds this limit value, the closure part 11 of the second throttle valve 6 is adjusted to the open position, so that the fluid is fed into the consumer unit 3 with the outlet pressure now increasing in steps to the level of the inlet pressure,

Claims

claims

1. Device for supplying a pressurized fluid to a consumer unit (3), with a shut-off element (4, 41) which can be connected to a feed unit (1) and which can be adjusted between a closed position and an open position via an actuating device (9, 55) , characterized by at least one throttle valve (6, 40, 80) intended for controlling the fluid flow, which has a valve body (10, 36, 42) with a valve seat (20) arranged between an inlet channel (12, 48) and an outlet channel (13) and has a closure part (11) which interacts with it and which, by means of an elastic support arrangement (18), between a closed position and a

Open position is adjustable, and which contains at least one throttle channel (30, 81) which is communicatively connected to the inlet channel (12, 48) and to the outlet channel (13), the closure part (11) depending on a predetermined limit value Outlet channel (13) building up, reduced pressure of the fluid between the closed position and the open position is automatically kept adjustable.

2, Device according to claim 1, characterized in that the throttle valve (6, 40, 80) is connected downstream of the shut-off device (4, 41).

3, Device according to claim 1 or 2, characterized in that the throttle valve (40) and the shut-off element (41) are formed in a common housing (42).

4. Apparatus according to claim 1 or 2, characterized in that the throttle valve (6, 80) is formed in a housing (10, 36) which can be coupled to the shut-off element (4).

5. Device according to one of the preceding claims, characterized in that the closure part (11) of the throttle valve (6, 40, 80) is a stepped piston which has a first piston section (21) with a first pressure surface (23) facing the valve seat (20) ) and a second piston section (22) with a smaller second pressure surface (24) facing away from the first pressure surface (23), and which is sealingly guided in a correspondingly graduated bore (14) of the valve body (10, 36, 42), wherein the first pressure area (23) delimits a first pressure chamber (33) open towards the outlet channel (13) and the second pressure area (24) delimits a second pressure chamber (34) which is connected to the inlet channel (12, 48) via a connecting channel.

6. The device according to claim 5, characterized in that the connecting channel is a through hole (25) which extends through the length of the closure part (11) and is open towards the valve seat (20).

7. The device according to claim 5 or 6, characterized in that the first piston section (21) is designed with a stepped end portion (26) intended for application to the valve seat (20), the first pressure surface (23) being provided by one of the End section (26) formed central part surface (27) and a peripheral part (28) surrounding the end part (26) which is set apart from it.

8. The device according to claim 6 or 7, characterized in that the throttle channel (30) is formed by at least one bore arranged in the closure part (11), which through the closure part (11) penetrating through bore (25) with the first pressure chamber (23) combines.

9. Device according to one of claims 1 to 7, characterized in that the throttle channel (81) is formed by at least one bore arranged in the valve body (10).

10. The device according to claim 9, characterized in that in the valve body (10) in the throttle channel (81) insertable means (85) for adjusting a predetermined flow-through cross section of the throttle channel (81) is arranged.