LARGER PNEUMATIC DISTRIBUTOR VALVE SLOT DRIVE GROUP

Description

DESCRIPTION of industrial utility model in name: CAMOZ ZI SpA of nationals! to: Italian 20FE8.20C2 rvì if with headquarters in: BRESCIA BS The pre feels found concerns a group increased drive of the pneumatic distributors. spool (13) of valves MI 2002 U 0 0 0 0 8 2 AND' I greeted that the valves they come in a shuttle like this named as in the body valve is housed an iq organ< oviable alternatively in after you and backwards communication diet discharges. In and indicated one or of the air as a shuttle, for more uses compressed or with general, the internal seal valve body is gaskets for example put or with in there their respective between the shuttle insured by ring-shaped appropriate estate called Oring. In the case or command indirect, or distance of the distribution valve, the spool is operated for at least one piston connected at one end and housed in a case fixed to one side of the valve body to. Such piston is in turn driven pneumatically or by an external control to the valve or from an electropilot connected to the valve itself. These spool distribution valves have however .1 ' drawback that require a high initial spur to move the shuttle and overcome friction of the sealing gaskets between there shuttle and the body valve. In fact, between the parts there is a tendon to manifest itself an effect of gluing blocking, gaskets, Between the walls of the especially when the made to work after it remained room valve inactive and the he comes for a certain time. Such inconvenience is particularly felt, example, when the plants tires they come reboot after the break of the end week. The fact that the alvole a shuttle no yes little share immediately, as should to be required, prevents .the downstream actuators of to function correctly with consequent possible damage. On the other hand part, the market and the specific use of such valve requires, for these types of valves above descr' encumbrances Always smaller however standardized for ensure easy and immediate i interchangeability even between valves Of different manufacturers. It follows that the surface thrust circle of the current pistons of actuation of the spools, having to be contained in the width of the valve body, it is also increasingly limited and therefore requires the use of high minimum operating pressures of the valve. This generates sealing problems and need for higher pressure compressed air. The aim of this invention is to overcome the above mentioned inconvenience and therefore to provide a larger actuation unit for the spool of pneumatic distributing valves capable of providing at the start but with a significantly greater force than that obtained in current valves at the same supply pressure. Another aim is to create an enlarged group for the actuation of the spool of pneumatic distributing valves that is particularly simple and does not require complex elements. These aims are achieved by means of an enlarged group for the actuation of the spool of distributing valves which essentially comprises a rectangular cross-section base to be fixed to the valve body and a piston housed in a chamber obtained in said base and connectable to the spool for its switching, in which the piston and the relative game bags are configured to take advantage of the maximum there rectangular section of the body of the bottom. According to the invention, the piston cross-section and of the room have a thrust surface of shape elliptical, rectangular or polygonal in general, in any case larger than the current circular surface, which could be the maximum possible based on the width of the caseback body. Correspondingly and advantageously, with a this increased drive group of the shuttle, the distributor valve will require a pressure minimum operating temperature lower than that request currently. The functional and structural characteristics and the advantages of an enlarged drive group shuttle of go pneumatic distributors according to the present tro ivato will be more evident from the description, by way of example and not by way of limitation, with reference to the attached schematic drawings in which: Figure 1 is a schematic section of a operated spool valve electrically equipped with a group of drive according to the finding, there Figure 2 shows in cross-section one valve island in which a piston is represented known to maximum circular section virtually obtainable within the width of the caseback illustrated, Figure 3 is a schematic perspective view partial cross-section of the piston in figure 2 piston n <j>to figure 2, Figure 4 is a section according to the positioned track IV- IV of figure it is indicated by lines and I also point a second bistone elliptical in shape, figure 5 is a perspective view of the piston rectangular shown in figure 4, Figure 6 is a perspective view of the piston elliptical mo dash and dot layer in the figure With reference to figure 1, with 10 is indicated globally shuttle buys part of a valve distributor to a valve body smiling 11 in which I am get a longitudinal housing chamber 12 Of a shuttle 13, at least for a first pass 14 for The connection of a use, a second step Of exhaust 1 5 relating to said use, and a third step 16 of compressed air supply. The shuttle 13 is axially movable forward and backwards in the relevant room 12 between at least two positions to put in communication alternatively 1'at least pr imo step of use 14 with the third power pass 16 or with the second passage of I unload 15. In a known way, to the valve body 11 is fixed at least one group of shuttle actuation 13 that it consists of essentially in a 17 in caseback which is a chamber 18 was created in which a piston 19 having its stem 20 facing and connected to shuttle 13. Compressed air for the command of piston 19 can come from a electropiloty fixed to the caseback 17, like in the example here illustrated, or from a device outer tire to the valve. The caseback 17 presents a rectangular section whose width L substantially coincides with there body width valve 11. In acc thrush with the found, the piston and there room 18 in which it is housed are sized configured in order to exploit as much as possible there rectangular section of the bottom 13, in particular its height, still allowing the passage of the various air supply and exhaust ducts tablet hella and from room 18 of the caseback as well as the presence of a possible device of intervention manual. As simplified in Figures 1, and 4-6, according to the present found the piston and the relative room 18 can then have a rectangular section 22 or ellipses about 23 that, with the same width L of the case back 17, they allow to oppose compressed air piston thrust a significantly larger surface piston 19 chest equipped with a section greater res surface circular. Gaskets appropriate naturally they promote and guarantee perfect estate. I am in addition to other possible various forms, such as, for example, polygonal ones in general. This invention is also applicable in the case of an axially drilled piston to allow compressed air to act directly on the shuttle, beyond than on the piston. As it appears evident, a larger group of drive of the shuttle comprising a piston with a section larger than the circular one it then allows a force to be exerted on the shuttle significantly greater than the groups of drive current and therefore, correspondingly, of reduce the minimum operating pressure of the valve with the same force exerted. Eng. Barzanò & Zanardo Milano SpA< / j>

Claims

CLAIMS 1. Groupq increased by shuttle actuation (13) of valves the pneumatics distributors, including tooth a hair dryer ideal (17) of section substantially rectangular to be fixed to a body (11) of the valve, in which bottom (17) is obtained room (18) in which a piston is free to slide (19) having a relative stem (20) facing towards and connected to a shuttle (13) for travel axial of this following the introduction of air compressed in said room (18), characterized by the fact that said piston (19) and the relative chamber (18) present a larger section than a Circe section maximum virtual lare obtainable within the width Of said bottom (17).

2. Group increased drive according to the claim the 1, wherein said piston sections (19) and of the relative chamber (18) are elliptical.

3. Increased drive group according to the claim and 1, wherein said piston sections (19) and of the relative chamber (18) are rectangular.

4. Increased drive group according to the claim 1, wherein said piston sections (19) and of the relative room (18) are polygonal.

5. Enlarged shuttle drive group (13) of pneumatic valves distributors as essentially illustrated in the as previously described and attached drawings. Ing. Barzanò at Zanardo Milano SpA as