FR2679976A1 - DISPENSER, PARTICULARLY PROPORTIONAL DISTRIBUTOR FOR PNEUMATIC FLUID. - Google Patents

Abstract

The present invention relates to a distributor, in particular a proportional distributor for pneumatic fluid, comprising a housing and a plunger guided therein, and an electromagnet arranged on the housing. - According to the invention, on the pusher (2) guided along a central axis (11), a shaft portion (12) of larger diameter (13) is provided in a central bore (14) of the housing (1), on which rest, by a first lever end (15), axially supported lever-shaped sealing member carriers (16) which are pivotally mounted in the housing (1) at their second end (17), are pressed, by means of a pressure spring (18), against a cover (5 or 19) of the distributor housing, and carry a sealing element (20) at a distance between the two ends (15, 17) determinable, and, between the cover (19) and the housing (1), a pressure space (21) is formed for a lever-shaped sealing member support (16), the sealing element (20) being associated with a seat (22) of a fluid connector (7-9).

Description

i

  The present invention relates to a dispenser, particularly

  connect a proportional distributor for pneumatic fluid.

  Continuous acting valves (distributors, pressure valves, and flow rate regulators) whose hydraulic output quantity is proportional to the electrical input signal and which are actuated, as a rule, by a proportional magnet, are known. piloted (DE-3 842 633) shows several chambers of

  pressure fluid which are arranged one behind the other.

  In this case, the pushers and pistons are guided by annular rings The adjustment of the two parts is difficult, because they are subjected to friction By

  elsewhere, seat diameters must be particularly

  important because of the arrangement of the bushings

  fairness and resulting flow cross-sections

construction.

  To reduce the adjustment energy that must be exerted,

  the friction forces must, on the contrary, be eliminated

  as much as possible We must maintain the weakest

  possible pressure and closing forces.

  Therefore, the necessary push-buttons must not be guided through the seats. In addition, care must be taken to adjust the travel of the valve and that of the magnet to one another. The object of the invention is to provide a distributor who can

  be operated with as little energy as possible.

  For this purpose, the distributor, in particular a proportional distributor for pneumatic fluid, comprising a housing and a pusher guided therein, an electromagnet dis- posed, in a sealed manner, on the housing, whose armature c} operates the dispenser pusher, which is supported in a sealed housing cover, opposite to the electromagnet, by means of a regulating spring, and fluid connections for working, pressure, and dispensing conduits; to the atmosphere, is remarkable, according to the invention, in that, on the pusher guided along a central axis, is provided a shaft portion of larger diameter in a central bore of the housing, on which rest at a first lever end, axially supported lever-shaped sealing member supports, which are pivotally mounted in the housing at their second end, are supported by means of a pressure spring; against a lid of the dispenser housing, and carry a sealing member at a distance between the two ends which can be determined, and in that between the cover and the housing a pressure space is formed

  for each time a lever-shaped sealing member support, the sealing member being associated with a seat therefor of a fluid connection.

  The advantages obtained by means of the invention consist in particular in that only two very light lever-shaped sealing element supports or, depending on the dispenser, even a single support, are arranged in the distributor housing, so that that the sealing element supports, when the pusher is in the middle position, can be pressed by means of the pressure spring on the existing sealing seats, whereby a lower energy is necessary at the same time, such a distributor can be manufactured economically and requires less

  parts until now An adaptation for different strokes can be achieved by modifying the lever arm.

  According to another characteristic of the invention, it is advantageous for the lever-shaped sealing element supports to be made of a sheet metal and resting on the pusher of the distributor, by means of curved parts, against a front face of the Large Diameter Shaft Part From the median position indicated, when removing the magnet armature, the adjusting spring raises the lever-shaped sealing element support

  of the sealing seat and thus free the flow section.

  is lying. An improvement of the invention provides that the lever-shaped sealing member support is guided by its second end between projections which are provided in the dispenser housing on a surface of the pressure space. lever-shaped sealing element is thus always moved perpendicular to the

sealing plane.

  According to another characteristic of the invention, each time two lever-shaped sealing bodies rest against opposite end surfaces of the shaft portion,

  on the pusher of the dispenser, by their bent parts.

  In the case of this embodiment, a 3/3 distributor is formed. Another advantageous embodiment of the invention provides

  that in the distributor housing, adjacent to the pressure space, fluid channels extend into a wall section, the outlet of which forms the fluid connections. Advantageously, this is achieved within the distributor, short flow paths.

  An improvement of the invention provides that the dispenser housing is essentially formed of an inner hub, an outer ring and the wall section receiving the fluid channels. Depending on the size of the dispenser, it is thus possible to save a lot of material. relative to

known dispenser housings.

  On the other hand, a further development of the invention is that in the case of pressure springs resiliently biasing the lever-shaped sealing member supports, a receiving cavity is formed in each a cover of the distributor housing, and a guide recess is formed on the

  lever-shaped sealing element support These two measures are used for safe mounting of the pressure springs.

  An extension of the field of use of the invention is furthermore obtained by means of two sealing element supports extending radially towards sides

  opposed and arranged axially offset, is formed a distributor 3/3 and, by removing one of the two sealing member supports, is formed a 2/2 distributor.

  The figures of the appended drawing will make it clear how the invention can be realized.

  FIG. 1 is an axial cross-section of the distribution

  tor. Figure 2 is the section along the line II-II of Figure l.

  Figures 3 and 4 show a swivel drive.

  Figures 5 and 6 show a rotary drive.

  The distributor, in particular a proportional distributor

  For a pneumatic fluid, there is a housing 1 and a pusher 2 guided therein. On the housing 1, an electromagnet 3 is mounted and fixed by means of a sealing ring 4. it actuates the pusher 2, via an adapter sleeve 4a, which is supported in a cover 5 of the distributor housing, sealed by means of an annular ring a, opposite to the electromagnet 3, by means of an adjusting spring 6 In addition, fluid connections 7, 8, 9 for working, pressure and venting ducts are provided. The pusher 2 of the distributor, guided along a central axis 11, has a shaft portion 12 having a diameter 13 greater than the adjacent sections, and the largest diameter 13 is slidably mounted in a central bore 14 of the housing 1 of the dispenser On this larger diameter shaft portion 13, a first lever ends 15 of axially supported lever-shaped sealing member supports 16 are provided, the second lever ends 17 of which are Pivotably mounted in the dispenser housing 115 A pressure spring 18 is disposed between the second lever end 17 and a cover 19 or 5 of the dispenser housing. The lever-shaped sealing member support 16 is provided with a sealing element 20 at a distance between the two ends 15,17 that can be determined, and which has a conical shape and is fixed, by its cone 20a, in a corresponding depression of

  sealing member support 16.

  For the sealing member support 16, a pressure gap 21 is formed between a cover 19 or 25 of the distributor housing and the distributor housing 1 at each sealing member 20 is associated with each other. seat

  22 for one of the fluid connections 7 to 9.

  The lever-shaped sealing element supports 16 are advantageously formed into a sheet metal and form curved parts 23, which rest on the pusher 2 against each time a front face 24 of the shaft part 12 at its second end. At the end 17, the lever-shaped sealing member support 16 is guided between projections 25 which are provided on a surface 26 of the pressure space 21 in the distributor housing 1. lever-shaped sealing element 16 rest, by their bent parts 23, on the pusher 2, against opposite end faces 24 of the shaft portion 12. During a longitudinal displacement of the pusher 2, one or the Other supports 16 are lifted from the sealing seat 22, in the direction of movement, and the corresponding fluid connection 7 to 9 is released. Depending on the position of the fluid connections 7 to 9, the dispenser may be closed or

open in the state without tension.

  In the housing 1 of the dispenser, adjacent to the pressure space 21, extends in a wall section 27, the fluid channels 7 to 9, the outlet 28 of which forms the fluid connections. canals

  of fluid 7 to 9 is possible because the housing 1 of the

  substantially consists of an inner hub 29, an outer ring 30 and a wall section 27 receiving

the fluid channels 7 to 9.

  For pressure springs 18 resiliently biasing the lever-shaped sealing member supports 16, a receiving cavity 32 is provided, each time, in a cover 19 or 5 of the dispenser housing, and a The guide recess 33 is provided on the lever-shaped sealing element support 16. As shown, in this embodiment example, the guide recess

  33 is conical, to center and guide the spring of pres-

sion 18.

  By means of two sealing element supports 16 extending radially towards opposite sides and arranged in an axially offset manner, a distributor can be formed.

  and, by removing one of the two

  16, a 2/2 dispenser can be formed.

  The dispenser may be attached to a machine or

  thanks to fastening holes 34.

  The dispenser is advantageously used as a valve

piloted with progressive action.

  In FIGS. 3 and 4, the distributor is shown for a pivoting drive set in position, the parts

  As used substantially identical to FIGS. 1 and 2, in place of the electromagnet 3 as a lifting magnet, a pivoting drive 3510 having a sealing member 36 is provided so that the magnet armature is provided. 4 corresponds to a rotary shaft 37.

  FIGS. 5 and 6 show a similar construction for a rotary drive, the individual parts of which essentially correspond to the embodiment of FIGS. 1 and 2. In addition, the shaft portion 12 carries control cams 38. radial and axial forces, a double bearing housing is

  advantageously provided in the housing 1 of the dispenser.

Claims (7)

  1 Distributor, in particular proportional distributor   for pneumatic fluid, comprising a housing and a push-   evening guided in it, an electromagnet arranged, so   watertight, on the casing, whose armature actuates the   distributor, which is supported in a sealed housing cover, opposite to the electromagnet, by means of a regulating spring, and fluid connections for working, pressure, and compression conduits. characterized in that, on the pusher (2) guided along a central axis (11), a larger diameter shaft portion (12) (13) is provided in a central bore (14). of the housing (1), on which a first lever end (15) is supported axially supported lever-shaped sealing element supports (16) which are pivotally mounted in the housing (1). ) at their second end (17) are supported by a pressure spring (18) against a cover (5 or 19) of the distributor housing and carry a sealing member (20) at a distance between the two ends (15, 17) being determinable, and in that, between the cover (19) and the housing ( 1), a space   pressure (21) is formed for each time a lever-shaped sealing element support (16), the sealing element (20) being associated with a seat (22) for the latter a fluid connector (7-9).   Dispenser according to Claim 1, characterized in that the lever-shaped sealing element supports (16) are formed in a sheet and rest on the pusher (2) of the distributor against a front face (24) of the shaft portion (12) by means of bent parts (23).   Dispenser according to claims 1 and 2,   characterized in that the lever-shaped sealing member support (16) is guided by its second lever end (17) between projections (25) which are provided in the distributor housing (1) on a surface (26) space pressure (21).   Dispenser according to Claims 1 to 3,   characterized in that each of two lever-shaped sealing member supports (16) rest, by their bent parts (23), on the pusher (2) against faces   opposite ends (24) of the shaft portion (12).   Dispenser according to claims 1 to 4,   characterized in that in the housing (1) of the dispenser, adjacent to the pressure space (21), in a wall section (27), fluid channels of which   the outlet (28) forms the fluid connections (7-9).   Dispenser according to claims 1 to 5,   characterized in that the housing (1) of the dispenser is   formed essentially of an inner hub (29), a cou-   external ring (30) and the receiving wall section (27) the fluid channels.   Distributor according to any one of claims 1   to 6, characterized in that for the pressure springs (18) biasing the element supports by an elastic force   lever-shaped seal (16), a receptacle cavity   tion (32) is provided each time in a cover (19 or) of the distributor housing, and a guide recess (33) is provided on the sealing member support. lever shape (16).   Dispenser according to claims 1 to 7,   characterized in that by means of two sealing member supports (16) extending radially to sides   opposed and arranged axially offset, a distribution   scorer 3/3 is formed and, removing one of the two supports   sealing member (16), a 2/2 distributor is formed.