DE2530069A1 - ASSEMBLY UNIT FOR PNEUMATIC SYSTEMS - Google Patents

Description

FISPA Sp _o Ao, Via Torino, 23, 10092 BEINASCO (TURIN) Italy Assembly unit for pneumatic systems

The invention relates to a device that can be used in compressed air systems Unit that fulfills the tasks of a filter, a pressure reducer and a lubricant atomizer .

Currently used in compressed air systems or installations Individual units used, which have individual functions, either as a filter, as a pressure reducer or as a lubricant supply element assigned to compressed air.

In contrast, the invention is based on the object of providing a structural unit that can be built into pneumatic systems create all three of the aforementioned functions in a single unit instead of the previous three separate ones Fulfilled structural units, with a structural simplification due to a smaller number of special components and consequently a reduction in manufacturing costs is achieved and installation is easier, faster and with less space is possible.

According to the invention this object is achieved in that a first element used to filter the compressed air, a second element used to reduce the pressure of the compressed air Element and a third for introducing a lubricant

509885/0379

-Z-

in the compressed air serving element are combined into one structural unit.

The first element preferably has a first chamber to which the compressed air is fed and in which a centrifugal body provided with wings is arranged, the heavy one contained in the compressed air and solid particles are capable of ejecting against the wall of the chamber, a lower region of the first chamber delimiting shielding disk and a filter insert are provided through which the first Chamber outflowing compressed air passes through it, and the first chamber is part of a detachable on the middle one Housing part of the structural unit attached container.

The second element has an advantageous pus formation the invention on a seal, on the one

J. 4.

Side a tensioning force of a spring that can be adjusted manually from the outside and on the other Side of the pressure substantially corresponding to the outlet pressure of the assembly in a second chamber The compressed air contained acts, the dependent on the tension force of the spring and the pressure in the second chamber Position of the seal a correspondingly larger or smaller opening of the flow of compressed air The main valve controlling the chamber is determined and the pressure of the outflowing compressed air depends on is the degree of opening of the main valve, and the second chamber and the outlet area of the compressed air from the Structural units are separated from one another by at least one section of an annular diaphragm, the deflection of which allows the compressed air to flow over from the second chamber into the outlet zone, so that the annular diaphragm has a second seal of Hauptven.tils forms.

B09885 / 0379

In a further development according to the invention, the third Element an atomizing nozzle with a main bore to which at least part of the compressed air flows, and a secondary well to which oil is pumped, the compressed air emerging from the atomizer nozzle and the oil mist to a third, part of the Container forming chamber are performed, which is also the collection chamber of the oil from this third Chamber for the secondary bore of the atomizer nozzle is passed through an opening that opens from the front end of one of the Outside adjustable screw is adjustable throttled, whereby the oil through a thin tube into a fourth chamber, delimited by a transparent cover and connected to the secondary bore *, drips.

For a better understanding of the invention, an exemplary embodiment is described below in conjunction with the drawing described, namely shows or show:

Fig. 1 is a plan view of an embodiment of the pneumatic assembly according to the invention ;

FIG. 2 shows a sectional view through the in FIG. 1 Unit shown, seen in the direction of arrows II-II in Fig. Ij

Fig. 3 Uo 4 partial sectional views through the in Fig. 1 assembly shown, seen in the direction of arrows III-III and IV-IV in Fig. 1}

Fig. 5 is a partial sectional view through a portion the assembly shown in Fig. 1, seen in the direction of arrows V-V in Fig. 1} and

FIG. 6 shows a side view of the structural unit according to the invention shown in FIG. 1.

The structural unit according to the invention shown in the figures has an advantageously made of metal

509885/0379

middle housing part 1 of essentially annular cross-section, in the two opposite sections 2 and 3 each have a connection bore k and 5 are provided, which have a threaded section for connecting the counter-threaded end section (not shown) of a respective compressed air inlet - or have the outlet line of the unit. The sections 2 and 3 are also provided with bores 6 through which the structural unit can be attached to a bracket in a suitable manner. As shown in FIG. 5, the lower part of the middle housing section 1 is provided with a threaded recess 7 with a circular cross-section, into which the upper part of a container 8 is screwed. The container 8, advantageously made of a transparent plastic material, has a substantially cylindrical shape and is provided in its central and upper area with a lateral outer wall 11 and a lateral inner wall 12, which are arranged concentrically to one another, and an annular chamber 13 between the two walls as well form an inner cylindrical chamber l * l ·. In the lower part of the container 8, an outlet or vent valve 15 is arranged. The upper outer section of the outer wall 11 is provided with a thread so that it can be screwed into the threaded recess 7 of the housing part 1. At the upper end of the outer wall 11 an annular seal 16 is arranged, which ensures the sealing of the annular quay 13 to the outside; Between the upper edge of the inner wall 12 and the housing 1 an annular seal 17 is also arranged, which ensures the tight seal of the chambers 13 and Ik from one another. The housing part 1 is centrally provided with an annular wall 18, the lower portion of which has an external thread on which the upper part of a

S098B5 / 0379

_ 5 -

Centrifugal body 21 is screwed on, which is essentially cylindrical and hollow and is provided on its upper side with wings 22 arranged in a suitable inclined manner, while its middle and lower section, consisting of an annular wall 23, formed a deflection element for the compressed air.The annular wall 18 forms an inner chamber 2k , which is connected to an area 26 delimited by the annular wall 23 via bores 25 in the upper surface of the centrifugal body 21. The upper part of the centrifugal body 21 carries a body 27 with sections which decrease in cross section in the downward direction, to the lower end of which the upper end of a shaft 28 is screwed, the lower end of which terminates in a circular shielding disc 31, the surface of which is inclined in the downward direction and whose Outside diameter is slightly smaller than the diameter of the cylindrical chamber Ik . The shaft 28 for its part holds a frustoconical filter insert 32 on the centrifugal body 21, which is preferably made of sintered bronze. The body 27 is hollow in its middle and upper region, and has inside a spring 33 which supports a cylindrical member Jk which an annular seal 35 i ⁿ eggs inside of the body 27 is slidably penetrated The flat top of the device 3k and The lower annular edge of a cylindrical hollow body 36, which is screwed into the base of the annular wall 18 of the housing part 1, form the main valve of the structural unit. The housing part 1 is provided in its upper region with an inner annular wall 38 which forms a chamber 39 into which the central cavity 37 of the cylindrical hollow body 36 opens. The cavity 37 also stands over a bore kl in the component 3k

509885/0379

with the inside of the body 27 in connection »On a step on the inner ring wall 38 and on an outer ring wall 42 of the middle housing part 1, an upper housing part 43 is placed, which is fastened to the middle housing part 1 by means of an annular union nut 44 _o The union nut vereist a bent annular flange which lies in an outer annular step 46 of the housing part 43, while the lower part of the union nut 44 is screwed over the outside of the annular wall 42.

The upper housing part 43 surrounds an inner chamber 47 »which is connected to the outside atmosphere via bores 48 in the upper part of the housing part 43. The upper section of the housing part 43 is also axially penetrated by a spindle 51, on the upper end of which a rotary knob is fastened by means of a screw $ 2 , while its lower end is screwed and coupled to a component $ h , which is the upper stop base for a spring ^ forms, the lower end of which is supported on a spring cap 56. An annular seal 57, which seals against the inner annular wall 38, is arranged in the lower section of the spring cap 56. A thin cylindrical tube 58 is fastened to the spring cap 56 in a coaxial alignment, the lower part of which rests on the flat upper side of the component 54 and thus forms a secondary valve. The thin tube 58 is in communication with the chamber 47 via a bore 59 in the spring cap 56. The connection bore 4 is connected to the cylindrical chamber 14 via a bore 61 in the housing part 1, while the annular channel 13 is connected to the connection bore 5 via an opening 62 in the middle housing part 1. In addition, the connection bore from the chamber 39 is through an annular membrane 63

600885/0379

separated from rubber, which is clamped between the upper base of the annular ¥ and 18 and the head of the cylindrical hollow body 36 and the connection of the hollow body 36 in the annular wall 18 seals. In FIG. 3 it can be seen that a thin tube 64 is arranged vertically in the ring karamer 13, the upper part of which enters a chamber 65 in the middle housing part 1. A small ball 66 , the diameter of which is greater than the inner diameter of the tube 64, is arranged in the chamber 65. The chamber 65 is also in communication with an upper chamber 67 in which a screw 68 is arranged. The lower end of the screw 68 has a frustoconical section which is designed to partially throttle the opening connecting the chambers 65 and 67. The union nut 44 is provided with a bore 69 which is aligned with a bore 70 in which the head of the screw 68 lies, the diameter of the bore 69 being smaller than the diameter of the bore 70.

4 it can be seen that the upper housing part 34 holds an observation bell 71 made of transparent material and presses precisely on an upper annular flange 72 facing the outside of the bell 71; An annular seal 73 is clamped between the annular flange 72 and the central housing part 1, whereby a complete sealing of the inner chamber of the bell is ensured. Inside the bell 71 there is also a thin tube Jk with a bent upper end, the lower part of which communicates with the chamber 67 (in a manner not shown). The middle housing part 1 is also provided with a bore which connects the chamber 39 with a chamber j6

5 09885/0379

? 53QQ69

which in turn is in communication with the annular chamber 13 _o The center line of the bore 75 is inclined to the center line of the chamber 76.In the bore 75 an atomizer nozzle 77 is arranged, which has a main bore 78 extending coaxially to the bore 75 and a perpendicular to the bore J8 Has secondary bore 79 which is in communication with the chamber formed in the bell through a bore 80 provided in the housing part 1.

In Fig. 5 it can be seen that the upper housing part 43 has a bore into which a screw plug 81 is inserted, the lower part of which is shown in FIG a threaded bore 82 formed in the middle housing part 1 is screwed in. The threaded hole 82 is in communication with the annular chamber I3. The screw plug 81 clamps an annular seal 83, which sealingly applied to the housing part 1. As can be seen from FIGS. 1 and 6, the structural unit is with a Pressure measuring instrument 84 is provided, which is connected to the area of the connecting tube 5.

The operation of the assembly described above is as follows χ

The compressed air enters the connection hole 4 and reaches the chamber 14 via the bore 6l. When it hits the wings 22 of the solid centrifugal body 21 the air is given a whirling motion. As a result of centrifugal force, the heaviest particles (water, oil and solid impurities) are against the inner wall 12 thrown, sink under gravity

Influence of force and are at the bottom of the chamber 14 in the section delimited by the shielding disk 31 collected, preventing it from returning to the upper area.

509885/0379

The filter insert 32, through which the compressed air passes, retains all further impurities still contained in it, so that the air flowing through the filter insert is free of all particles of a size of, for example, more than 35 / * ^m . The reaching the region 36 compressed air then flows into the passages 25 and reaches the inner chamber 2k, during which, the outlet means of the knob ^{53> d} s desired ¥ ert be set in the connection bore. 5 A rotation of the knob 53 and thus of the threaded lower section of the spindle 51 causes an axial displacement of the component 5 ^ ¹¹¹¹ CL and consequently also a change in the compressive force exerted by the spring 55 on the spring cap 56, which is exerted by the spring 55 on the seal 57 is transmitted. This pressure force is counteracted by the pressure exerted by the compressed air contained in the chamber 39, which pressure is equal to the pressure in the outlet connection bore 5, on the seal 57. Under the influence of the opposite pressure forces acting on the seal 57, the seal 57 assumes an equilibrium position in which the spring cap 56 and, as a result, the cylindrical component 3 ^ · are displaced via the tube 58 into a position in which the from the chamber 2k to the central cavity 37 and thus the amount of compressed air passing through the chamber 39 determines the required outlet pressure. In addition, the pressure remains constant} if any pressure change occurs, this leads to a change in the position of the seal 57 and therefore to a change in the position of the cylindrical member Jk such that the opening of the main valve changes and thereby the chamber 39 in turn required constant pressure

509885/0379

is set. In the event of a sudden increase in pressure in the outlet connection bore 5, the seal 57 and the spring cap 56 are displaced upwards, whereby the tube 58 lifts off the flattened surface of the cylindrical component 34, so that an excess amount of air through the tube 58, the bore 59 and the bores 48 can flow off to the outside atmosphere. The compressed air present in the chamber 39 then reaches the outlet connection bore 5 ^a ^ f two ways; a portion will deflect the annular diaphragm 63 and reaches directly the connection bore 5 'another part flows, instead, as shown in FIG. 4, through the Hauptbphrung 78 in the spray nozzle 77 »sucks an appropriate amount of oil and, as the discharge direction of the spray nozzle 77 ^to the Walls of the chamber 76 is inclined, oil particles with a diameter greater than 5-10 ^ m drips into the annular chamber 13, while the finer components of the oil mist mixed with air can pass through the opening 62 to the connection bore 5. The air located in the connection bore 5 therefore consists of a mixture of the air supplied by the bending of the annular membrane 63 and the compressed air which has passed through the atomizer nozzle 77 and is thereby enriched with lubricant. The oil supplied to the atomizer nozzle 77 via the secondary bore 79 comes from the annular chamber of the container 8, whereby under the effect of the pressure drop generated when the compressed air passes through the main bore 78, which acts on the inner area of the bell 7I *: Oil from the chamber I3 is sucked into the pipe 64. The amount of oil sucked in is adjusted by the screw 68 acting as a throttle in the connection opening to the chamber 67. The amount of oil reaching the chamber 67 runs over the pipe 74 and drips

509885/0379

into the chamber formed by the bell 71 and then reaches the secondary bore of the atomizer nozzle via the bore 80. The ball 66 prevents oil from flowing back from the chamber 6j into the annular chamber 13 »ie the ball represents a check valve for the pipe 64. The oil is introduced into the annular chamber 13 of the container 8 in that the screw plug 81 is unscrewed and oil is poured into the bore 82, which oil flows from there into the chamber.

The pneumatic assembly according to the invention explained above thus acts as a filter for solid and heavy particles contained in the compressed air, it enables the outlet pressure to be set to a constant value and enables the compressed air to be mixed with a lubricant in which finely atomized oil is introduced into the compressed air ·will. The outlet valve in the lower part of the container 8 allows periodic removal of solid particles and condensate that collect below the shielding disc. The container 8 can also be unscrewed from the central housing part 1 for maintenance purposes, its transparent design allowing both the amount of deposits in the chamber Ik and the amount of oil in the annular chamber 13 to be checked.

The structural unit according to the invention offers, in addition to the obviously greater economic efficiency and the ready-to-use installation, structural features of essential importance for the invention in comparison to the use of three different structural units ^ so the upper housing part 43 is only attached to the middle housing part 1 by means of the union nut hh, with the upper Housing part the observation

$ 09885/0379

Bell 71 and the ring seal 83 for the screw plug 81 used to fill oil into the chamber I3 also allows the arrangement of a bore 69 in the upper housing part 43 with a smaller diameter than the diameter of the bore 70, in which the screw used for throttling the oil flow 68 sits, the setting of the screw pitch, but at the same time the loss of the SQhraube by escaping from the associated bore is avoided. The annular diaphragm 63 is also an element used to determine the exact relationship between the amount of air reaching the outlet connection bore 5 through its bending and the amount of air flowing through the atomizer nozzle 77. The diaphragm 63 also acts as a seal between the cylindrical hollow body and the annular body Wall 18, whereby a correct function of the main valve is achieved. The container 8, which consists of two concentric chambers 13 and 14, allows both solid, precipitated particles and lubricating oil to be received. Finally, the inclined position of the center line of the atomizing nozzle 77 relative to the center line of the chamber 76, through which the exiting air and the oil mixture exiting the atomizer are thrown against the wall of the chamber J6 , allows the larger oil particles to drip off into the chamber 13 »whereby the Use of an additional separating grid becomes unnecessary, which otherwise has to be provided in lubricating devices if the outlet jet of air mixed with lubricant strikes.

Finally, nooh should point out that further Modifications and developments of the structural unit according to the invention described above within the scope of Inventive concept can be realized.

509885/0379

Claims (8)

Patent claims 1. Assembly for pneumatic systems, characterized by a first element (21, 22, 23, 31, 32) serving to filter the compressed air, a second element (39 > 51 - 571 63) serving to reduce the pressure of the compressed air, and by a third element (62, 67, 68, 71, 74-80) serving to introduce a lubricant into the compressed air. 2. Assembly according to claim I _1, characterized in that the first element has a first chamber (lh) to which the compressed air is supplied and in which a centrifugal body (21) provided with wings (22) is arranged, the heavy weight contained in the compressed air and solid particles are able to eject against the wall (l2) of the chamber (lh) , a shielding disk (31) delimiting a lower region of the first chamber (lh ) and a filter insert (32) being provided through which the from the first chamber ( l4) outflowing compressed air passes, and that the first chamber (lh) is part of a container (8) which is detachably attached to the middle housing part (l) of the structural unit. 3. Assembly according to claim 1 or 2, characterized in that the second element has a seal (57), on one side of which one of the manually adjustable tensioning force of a spring (55) and on the other side of the substantially The pressure of the compressed air located in a second chamber (39), corresponding to the outlet pressure of the structural unit, acts, the position of the seal (57) depending on the tension force of the spring (55) and the pressure in the second chamber (39) being correspondingly greater 609885/0379 or smaller opening of a main valve controlling the flow of compressed air into the second chamber and the pressure of the outflowing compressed air depends on the degree of opening of the main valve is, and that the second chamber (39) and the outlet area (5) the compressed air from the structural unit through at least a section of an annular diaphragm (63) are separated from each other, the deflection of which causes the compressed air to flow over from the second Chamber (39) in the outlet zone (5) allows so that the annular diaphragm (63) a further seal of the main valve forms » 4. Unit according to one of claims 1 to 3 »characterized in that the third element is a Atomizer nozzle (77) with a main bore (78), to which at least part of the compressed air flows, and a secondary bore (79) to which oil is conveyed has, wherein the compressed air emerging from the atomizer nozzle (77) and the oil mist are added a third chamber (l3) forming part of the container, which also is the collecting chamber of the oil that flows from this third chamber (13) to the secondary bore (79) of the atomizing nozzle (77) is passed through an opening which is adjustable from the front end to an opening from the outside The screw (68) can be throttled in an adjustable manner, whereby the oil flows through a thin tube (7 * 0 into a fourth, limited by a transparent hood (71) and the chamber connected to the secondary bore (79) drips. 5. Unit according to claim 4, characterized in that that the center line of the outlet bore (78) of the atomizing nozzle (77) to the center line of the third 509885/0379 Chamber (13) and / or a fifth, between the Outlet of the atomizing nozzle (77) and the third Chamber (13) located fifth chamber (76) inclined runs so that the jet of compressed air and oil mist emerging from the atomizer nozzle (77) hits the walls of the third and / or fifth chamber. 6. Unit according to claim 4 or 5 »characterized in that the first chamber (l4) is a centrally arranged in the container (8 ¹ ) cylindrical chamber, that the third chamber (13) to the first chamber (l4) concentrically arranged annular chamber in the container (8), and that the container (8) is made of a transparent plastic. 7. Assembly according to one of claims 4 to 6, characterized in that the first chamber (l4) is in communication with the inlet region of the compressed air in the assembly, that the compressed air exiting from the first chamber (l4) into the second via the main valve chamber (39) flows, that the spray nozzle (77) i ⁿ a connected with the second chamber (13) bore (75) is arranged, and that the outlet portion (5) of the pressurized air from the assembly to the second chamber (39) in Connection. 8. Unit according to one of claims 4 to 7, characterized in that on the central housing part (L) an upper housing part (43) arranged and by means of a union nut (44) on the middle. Housing part is attached, and that the upper housing part (43) containing the fourth chamber transparent housing (7l) and a ring seal (83) 509885/0379 for a screw plug (8l) used for filling oil into the third chamber (13) . Assembly according to claim 8, characterized in that the upper housing part (43) is provided with a bore {69) which is arranged coaxially to the center line of the externally adjustable screw (68), and that the bore (69) has a smaller diameter than has the diameter of the head of the screw (68), so that the possibility of the screw (68) emerging from the associated threaded hole is excluded. B0988B / 0379