EP0686775B2 - Electropneumatic valve assembly - Google Patents

Description

State of the art

The invention is based on an electropneumatic Valve device for independent control two. Consumer connections according to that in the preamble of claim 1 specified genus.

It is such an electropneumatic valve device for independent control of two consumer connections known from DE 42 26 539 A1, as used in valve carrier systems for better utilization of the limited valve positions is used, whereby Different valve series on one valve position can be arranged at the same time. At this Valve device are on one of the two consumer connections having connection plate electromagnetically operated 3/2 valves on both ends grown. Both 3/2 valves and the connection plate sit on an adapter plate, which in turn is on a Base plate of the valve carrier system is attached. The In addition to hydraulic connections, the adapter plate contains also the two electrical plug connections for the two 3/2 valves and a plug connection for connection to the base plate. Even though with this valve device through better use of space a larger number of control functions specified number of valve positions can be accommodated is, this valve device builds in terms of costs and Installation space is relatively expensive. The flow rates are also to the consumer connections at this Limited design, especially as direct operated 3/2 valves be used. The variety of connectors and components also increases the susceptibility to faults in the Operation and complicates the assembly.

Furthermore, DE 40 20 024 A1 is electromagnetic actuated directional valve known as 5/2 valve is designed, both of which for pilot control serving solenoid valves on a single face of the actual directional valve are arranged. In this way, the directional valve comes without an adapter plate with a single electrical connector; however, is between the actual case and the Pilot valves require an intermediate plate that has a plurality of control channels. Also are here the drive pistons for the main spool directly performed in the directional control valve housing, which is a complex Construction caused. But above all, this is 5/2-way valve designed for only one control function, how to control a double acting Consumer is needed. In many applications an optimal design is not possible, in particular in valve carrier systems.

Furthermore, EP 0 139 259 B1 is an electrohydraulic one Control valve known in the case of a housing two electromagnetically actuated coaxially pilot operated, 3/2 valves are installed. Both 3/2 valves are identical to each other and in a complex Seat valve design, so that overall four switching combinations are possible and the connected one double-acting engine not only in both Directions can be moved, but also in brought a blocking position and a floating position can be. This valve is also designed so that it is only for a control function to control a double-acting consumer. The one in hydraulics Seat valve design used is suitable not for pneumatic valve carrier systems.

Furthermore, the older, not pre-published EP 0 663 532 B1 an electropneumatic valve device proposed in which a two-part housing Longitudinal direction of a slide holder is divided and so the Installation of two control spools with two control edges each enables. One receiving the two control spools The slide bore ends in the area of the drive piston and thus at a distance from the end faces of the housing. This Valve device does not have and has a standard housing no pilot module and no cover attached to the End faces of the housing are arranged, the Slider bore runs between the end faces.

Advantages of the invention

The electropneumatic valve device according to the invention for independent control of two consumer connections with has the characteristic features of the main claim on the other hand the advantage that with simple and cost-effective design better with a given installation space Control functions can be used. This allows in valve carrier systems at a valve position use different valve series together, whereby especially two 3/2-way valves can be easily accommodated can.

By integrating both directional valves in one Standard housings can handle higher flow rates realize, as is usually the case with a 5/2-way valve the case is. A separate, the consumer connections having connection plate can now be omitted. As well an adapter plate is no longer required, which means that no only space and costs decrease, but also assembly simplified and the susceptibility to interference is reduced. The Valve setup is easy for different functions can be equipped by using the corresponding longitudinal slide differently arranged control edges are used, so that functions such as normally open, normally closed or implement combinations of these. The most Standard housing with flanged pilot control housing integrated pilot valves and electrical connection favors a cost-saving and compact design. there can be a cheap, mass-produced Use standard enclosures without major changes to the Valve device simple and space-saving and robust too realize.

By the measures listed in the subclaims advantageous developments and improvements in Main claim specified electropneumatic Valve device possible. It is useful if the Valve device according to claim 2 with outside of Standard housing mounted drive piston is equipped, which favors an inexpensive and easy manufacture. A training according to claims 3 to 4 is favorable, which provides a combined resilience and pneumatic force is done by the longitudinal slide face on its smaller effective area from Inlet pressure is applied. It is also advantageous if the standard housing is designed according to claim 5, what a simple and inexpensive design of the Valve device supported. Can be convenient further according to claims 8 to 10, the valve device be designed so that by easily replaceable Longitudinal slide any combination of functions Normally open or normally closed possible are. Further advantageous configurations result from the other claims.

drawing

An embodiment of the invention is in the Drawing shown and in the description below explained in more detail. 1 shows a partial Longitudinal section through an electropneumatic Valve device for independent control of two A simplified representation of consumer connections and Figures 2 and 3, a second and third embodiment the electropneumatic valve device with other longitudinal slides for different ones Functional variants.

Description of the embodiment

In Figure 1 is a simplified representation electropneumatic valve device 10 partially in Longitudinal section and partially shown schematically as them in a valve carrier system at a valve position Base plate can be mounted. The valve device 10 essentially consists of a valve module 11, a pilot control module 12 and a cover 13, which are all built together.

The valve module 11 has a standard housing 14 of a 5/2-way valve in which a continuous Slider bore 15 between its two end faces 16, 17 runs. In the slide bore 15 are through ring-shaped extensions five side by side Chambers 18, 19, 21, 22, 23 formed by which the central chamber 21 with a P designated inlet port 24 is connected. The too chambers lying on both sides of the third chamber 21 19 and 22 are with the consumer connections 25, 26 connected, which are designated here with A and B, respectively. The remaining outer chambers 18, 23 are connected to return ports 27, 28 which with R are designated. While the two consumer connections 25, 26 upwards in the standard housing 14 are led to a transverse side 29, the inlet connection 24 and the two return connections 27, 28 in a lower transverse side 31.

In the slide bore 15 are now of both End faces 16 and 17 forth a first and a second Longitudinal slide 32, 33 installed and in the slide bore 15 tightly and smoothly guided. Both longitudinal slides 32, 33 are identical to one another and assign for the function of a 3/2 valve each two control edges 34, 35. Each longitudinal slide 32, 33 has an outer piston portion 36 with which it can strike the standard housing 14 and thus one End position of the longitudinal slide 32 or 33 marked. A return spring is located on this piston section 36 37 with its other end in the standard housing 14 supports. Because the two longitudinal slides are of the same design, are the same components on second longitudinal slide 33 with the same reference numerals, but provided with an apostrophe.

On the first end face 16 of the standard housing 14, the pilot control module 12 is attached, which in its Inside a first pilot valve 38 and a second Pilot valve 39 receives. Both pilot valves 38, 39 are identical to one another and designed as 3/2-way valves, which can be operated electromagnetically against spring force are. The first pilot valve 38 is used for Control of the first longitudinal slide 32, the second Pilot valve 39 correspondingly for the second longitudinal slide 33. There is also one in the pilot control module 12 recess 41 which is open towards the end face 16, in which a first drive piston slidably guided is. The drive piston 42 is thus outside the Standard housing 14 in the pilot housing 43 of the Valve module 11 stored, and forms one of the first Longitudinal slide 32 separate component, which is concentric is mounted to the longitudinal slide valve and when pressurized in a pressure chamber 44 the first longitudinal slide 32 can operate. The pressure chamber 44 is closed this purpose via a first control line 45 with the Pilot valve 38 connected. Furthermore, the first is Control valve 38 via a pressure control line 46 with the inlet connection 24 in connection. To this Pressure control line 46 is parallel to the first pilot valve 38 also connected the second pilot valve 39. Furthermore, leads from the first pilot valve 38 a sequence control line 47 to the return connection 27, the second pilot valve 39 also correspondingly here is connected in parallel. On the pilot module 12 is also an electrical connector 48 arranged, via which the control signals for the two Pilot valves 38, 39 can be entered.

On the second end face 17 of the valve module 11 the lid 13 is attached, the in a blind hole Recess 49 receives a second drive piston 51. This drive piston 51 is also from the second Longitudinal slide 33 formed separately and thus only stored in the lid 13. The drive piston 51 limits a pressure chamber 52, which via a second control line 53 has connection with the second pilot valve 39, this control line 53 through the standard housing 14 passed into the pilot housing 43 is.

The first pilot valve 38 and the first longitudinal slide 32 with the associated drive piston 42 thus form parts of a pilot-operated, first 3/2-way valve 55, while the second pilot valve 39 with the second longitudinal slide 33 and the drive piston 51 forms a second, pilot-operated 3/2-way valve, both of which can be controlled independently of one another. The control edges are in both directional control valves 55, 56 34, 35 on the longitudinal slides 32 and 33, respectively, that the valves are of a type that are "normally closed" referred to as. This means that at non-energized pilot valves 38, 39 the longitudinal slide 32, 33 each assume their spring-centered end position, in each of which the connection from the inlet connection 24 to the assigned consumer connection 25 or 26 is blocked.

The mode of operation of the electropneumatic valve device 10 is explained as follows, the relationship such a valve device 10 with an unspecified base plate in one Ventit carrier system provided as known per se becomes:

In the valve device 10 are the first 3/2-way valve 55 and the second 3/2-way part 56 switched off shown. For actuating the first directional valve 55, the first pilot valve 38 becomes magnetic actuated against spring force, so that from the inlet connection P via the pressure control line 46, the pilot valve 38 and the first control line 45 supply air in the first Pressure chamber 44 can flow and there the first drive piston 42 acted upon. The pressurized effective cross section of the drive piston 42 is essential greater than that in the chamber 21 from the inlet pressure end face of the first longitudinal slide 32, so that the longitudinal slide 32 against the force the return spring 37 moved into the working position becomes. The one separately stored in the pilot housing 43 Drive piston 42 can not apply any radial forces exert the longitudinal slide 32. In this working position of the longitudinal slide 32, in which the piston section 36 strikes on a collar in the standard housing 14, is the first control edge 34 within the chamber 21 so that supply air from the inlet connection 24 flow freely to the first consumer connection 25 can. At the same time, the second control edge 35 locks the connection from the consumer connection 25 to Return port 27 from. Will the excitement of the first Pilot valve 38 switched off, so the pressure chamber 44 via the first control line 45 and the start-up line 47 relieved to the return port 27, so that the return spring 37 together the first longitudinal slide 32 with the drive piston 42 to the left in a Pushes rest position, the first control edge 34th the connection from the inlet connection 24 to the consumer connection 25 interrupts while the second control edge 35 the consumer connection 25 to the return connection 27 relieved.

With the help of the second pilot valve 39 can the second longitudinal slide 32 through the drive piston Press 51 in the same way so that the Function of the second directional valve 56 independent of that of the first directional valve 55 can be used. By the arrangement of two 3/2-way valves on the same Valve location on a base plate can thus be Save installation space and costs and the functional content of a valve block starting from the same one Increase the base plate. By using the standard housing 14 can be a high flow rate reach, as otherwise with 5/2-way valves of the same Series is the case. Thanks to the integrated arrangement both pilot valves 38, 39 in the pilot module 12 on a single face of the standard housing a single electrical plug connection is sufficient 48 for the control of both directional control valves 55, 56. Das Standard housing 14 and the pilot module 12 are designed so that it without an additional adapter plate directly on the base plate in a valve carrier system can be assembled. Through training the drive piston 42, 51 than from the longitudinal slide separate components, which are outside the standard housing 14 in the attached pilot control housing 43 or cover 13 are stored, are annoying Influences on the storage and guidance of the longitudinal slide 32, 33 avoided.

FIG. 2 shows a second electropneumatic valve device 60 which differs from that according to FIG. 1 only in that it uses two other longitudinal slides 61, 62 which are identical to one another.
In the case of these longitudinal slides 61, 62, the position of the control edges 34, 35 is selected so that both valves have the "normally open" function. This means that when the valves are not energized, the connection from the inlet connection 24 to the consumer connection 26 is open, while the connection from the latter to the return connection 28 is blocked; this is shown in FIG. 2 with the longitudinal slides 61, 62 in the rest position. In the valve device 60, therefore, both directional control valves are designed for a “normally open” function. The mode of operation of the valve device 60 corresponds otherwise to that of the valve device 10.

FIG. 3 shows in simplified form a third valve device 70, in which in the standard housing 17 in first directional valve 55 a first longitudinal slide 32 for the function "normally closed" and in the second directional valve 56 a second longitudinal slide 62 for the function "Normally open" are installed. In this way can 11 different valve variants in the valve module will be realized.

Of course, the embodiments shown are Changes possible without thinking to deviate from the invention. Although the one shown Assignment of the connections is particularly advantageous the standard housing 14 can also be used that the middle terminal 24 with R and the two Connections 27, 28 can be assigned P if necessary. Also Designs are possible in which longitudinal slides and Drive pistons are integrally formed together. The position of the longitudinal slide 32, 62 in Fig. 3 can also be exchanged.

Claims (11)

1. Electropneumatic valve device (10) for the independent control of two consumer connections (25,26), each via one of two electrically activatable valves (55,56), of which each valve is designed with 3/2 function and has a control member (32,33) which is inserted between an inflow connection (24) for supplying both valves (55,56) with pressure medium, the consumer connection (25,26) and a return connection (27,28), and in which valve device the two valves (55, 56) and the connections (24,27,28) are arranged essentially in one plane, so that the valve device (10) is suitable in a valve subassembly for mounting on a baseplate, characterized in that the valve device (10) has a standard housing (14) of a 5-way valve, the said housing having a continuous slide bore (15), in which there are arranged next to one another five chambers (18,19,20,21,22) which are connected to at least one inflow connection (24), the two consumer connections (25,26) and at least one return connection (27,28), in that the two control members are slidably guided in the slide bore (15) and are designed in each case as pressure-medium-actuable longitudinal slides (32,33) which have two control edges (34,35) corresponding to their 3/2 function and which can each be actuated by a drive piston (42,51), in that both electromagnetically actuable pilot valves (38,39) for controlling the drive pistons (42,51) are arranged jointly on a single end face (16) of the standard housing (14), and in that the slide bore (15) runs on the standard housing (14) between two end faces (16,17), on which are mounted, on the one hand, a pilot module (12) receiving the pilot valves (38,39) and, on the other hand, a cover (13).
2. Valve device according to Claim 1,
   characterized in that the drive pistons (42,51) are structural elements separate from the longitudinal slides (32,33) and are slidably guided outside the standard housing (14) in the mounted parts (11,13).
3. Valve device according to Claim 1 or 2,
   characterized in that a restoring spring (37,37') bears on each longitudinal slide (32,33) and is additionally supported on the standard housing (14).
4. Valve device according to one of Claims 1 to 3, characterized in that the effective pressure-loaded area of the drive piston (42,51) is larger than the pressureloaded area of the longitudinal slide (32,33) in the chamber (21).
5. Valve device according to one of Claims 1 to 4, characterized in that, in the standard housing (14), of the five connections the connection (24) located in the middle, as seen in the axial direction, serves for the inflow (P), next to which the consumer connections (25,26) are located on both sides, whilst the two return connections (27,28) are located on the outside.
6. Valve device according to Claim 5,
   characterized in that the two consumer connections (25,26) run into one transverse side (29) of the standard housing (14), whilst the inflow connection (24) and the two return connections (27,28) run into the other transverse side (31).
7. Valve device according to one of Claims 2 to 6, characterized in that control ducts (53,46,47) run through the standard housing (14), one (53) of the said control ducts leading from the pilot valve (39) to the drive piston (57) in the cover (13).
8. Valve device according to one of Claims 1 to 7, characterized in that the two longitudinal slides (31,32) are designed for a normally-closed function (Figure 1).
9. Valve device according to one of Claims 1 to 7, characterized in that the two longitudinal slides (61,62) are designed for a normally-open function (Figure 2).
10. Valve device according to one of Claims 1 to 7, characterized in that one longitudinal slide (62) is designed for a normally-open function and the other longitudinal slide (32) for a normally-closed function.
11. Valve device according to one of Claims 1 to 10, characterized in that the pilot housing (43) has a recess (41) like a blind hole, in which the drive piston (42) for the first longitudinal slide (32) is guided.

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