DE1550138B1 - Pressure relief and control device - Google Patents

Description

1 2

The invention relates to a pressure to be seen that only at the beginning of the opening stroke effective load and control device with a back pressure, but which is automatic during the follow-up valve, which is switched off by a slidingly arranged closing stroke, Neten piston component is received, which according to the invention is proposed for this purpose, Inside of the housing in inlet and outlet spaces 5 that the closure piece of the shut-off valve splits as which is designed with a pressurized feed source and a pre-shaped element, its through-flow container are connected, and with a spring knife is slightly smaller than that of the biased ones Shut-off valve, which is coaxial and in the end cup-shaped wall of the outlet space, stood to the check valve within an outlet and that with an annular, outwardly open laßraumes of the housing, which is provided with the inlet space of io groove, which with the inlet space over the atmosphere separates, is arranged, wherein the channels communicates, wherein within the groove Exhaust valve drives with the piston component an expandable from the fluid pressure on all sides in connected and when the cut-off pressure is reached in the radial direction displaceable element sealing The direction of the fluid outlet opens, and is arranged in the elastically deformed state wherein in the open position a larger effective 15 in the immediate vicinity of the surrounding wall of the same area of the fluid pressure as in the outlet space, whose cup-shaped section has a closed position is applied. compared to the total stroke of the shut-off valve The problem of sudden switching has the shallow depth held by the pressure Exhaust valve in pressure medium control valves as well as that prevails in the inlet space as long as the AbMittel to solve this problem are already 20 shut-off valve is in its closed position or known. the opening movement begins, and the in-span pressure regulators are also used to monitor the inoperative state of a large radial filling a compressed air tank, especially for standing up from the surrounding wall, Brake systems in motor vehicles are known to have a when the shut-off valve is in its open position Have elastic closure component that reaches the open 25.

would have, the connection between the connection preferably points in the radial direction

and the duct to the atmosphere to close and the sliding element has an inner expandable O-ring

then an actuation force from the plunger to the locking mechanism, sliding and sealing with the one another

Transferring the final component while first compressing opposite side surfaces of the groove and then is depressed, 30 menacts, and there is an outer resilient ring in front.

so that an additional force arises. seen acted upon by the inner O-ring

The use of resilient and radial outward pressure is also used,

Rings are known as sealing components for a valve when there is a sufficiently high pressure in the inlet space

that is made up of a multitude of arranged one above the other. The outer, resilient ring can be made Neten elements or disks consists, and there are 35 a split clamping ring, but it can

of course, in addition, an annular helical spring that seals all-

O-rings known. is embedded in a flexible material on one side.

Furthermore, shut-off valves belong to the state of the art. According to a special embodiment of the invention, in which an additional flat annular surface is in the wall of the outlet chamber in is exposed to the fluid pressure when the 4 »axial groove is provided, whose Valve element leads its movement from the assigned outer end into the open and its inner end neten seat starts off; this additional area should be arranged so that the spring passes over it result in snap opening of the valve. moves as soon as the shut-off valve reaches its opening

The object of the present invention is movement begins.

especially in connection with an old 45 Furthermore, in a special execution Suggestion of the inventor (German patent form of the invention a cup-shaped element 1 252 994), which can also be provided on a pressure whose diameter is greater than lashings and control equipment. To with those of the disc-shaped closure piece and its older suggestion for maximum power to replace an upstanding ring-shaped wall aim, it is very desirable that the outlet valve 50 forms a stop for the outer resilient ring, after the initial tearing open in the full case of the pressure relief and the invention open position opens with a snap action; Control device is achieved that the additional this can be achieved in that the valve effective area becomes ineffective before the stop an additional area is provided on the release valve closes again, so that the latter when the pressure in the inlet chamber can act when the 55 closing cannot flutter and completely free with the Valve was ripped open at the beginning. Although the assigned seat can come into engagement, by an additional area an opening with the following the invention is in connection Snap action can be achieved, but it can sometimes with the drawing on the basis of an embodiment hinder the closing of the valve, game explained. It shows

in that, when the valve is almost at the 60 F i g. 1 is a vertical cross-sectional view through

closed position and is still torn open, a pressure relief and control device according to

the pressure in the inlet chamber is equal to the pressure at the valve of the invention,

tilsitz and around the limited area between the F i g. 2 is a vertical view in an enlarged view

Body and the valve so that the valve does not cut through a detail according to the invention,

closes with certainty. 65 Fig. 3 is a view similar to that of Fig. 2,

The aim of the present invention is therefore, with a but with the corresponding parts in a different

Pressure relief and control device of the one other position are shown, and

Initially described type an additional area vor- F i g. 4 is a vertical cross-sectional view of a

ORIGINAL INSPECTED

3 4

In the modified embodiment of the invention in FIG. 4, an O-ring 58 is incorporated which is slidable and

Partial view. sealing with the upper and lower surfaces of the

F i g. 1 shows a valve cooperating with a hollow body groove. In the groove 54 is outside the 10, an internally screwed open upper limiting O-ring 58 also has a slotted, resilient metal tongue has, which is received by a cap component 12 5 ring 60 which is pressed outward, is locked; the component 12 has an outlet if a sufficiently high pressure on the O-ring 58 Opening 14, which acts in a discharge space 15, so that this component is in the radial direction Body 10 with a fluid container (not expanded until the ring with the vertical shown) connects. The body 10 has a wall 48 of the cup-shaped element 46 to the inlet opening 16 on the side that interacts with the delivery io, which is the expansion of the ring side of an air compressor can be connected, 60 limited, as in F i g. 2 shown. When the opening 16 into an inlet space 18 inner O-ring 58 exerting pressure into the atmosphere half of the body 10 leads, the lower side of which is released, the resilient ring 60 pulls Includes flange 20 surrounding outlet port 22 and returning O-ring 58 to a free state, there, which is controlled by a shut-off valve 24 15 in which the ring 60 is moved from the vertical Wanw, which moves away through a raised ring on top 48 and into groove 54, whereby side of a disk-shaped closure piece 25, a large spacing area between the disk 25 is formed and which is normally sealing and the wall 66 is achieved, as shown in FIG. 3 in engagement with the underside of the flange 20.

comes so that the outlet opening 22 is closed 20 Is the discharge opening 14 with a flow

will. The discharge space 15 in the body 10 is of the medium pressure container and the inlet opening 16 with

Inlet chamber 18 separated by a piston 28, which is connected to a compressor and becomes the latter

rather, it has fluid channels 30 that act upon one another, it gives a fluid pressure

extend through piston 28; the upper ends into the inlet space 18 via an inlet opening 16

of the channels are cut off by a shut-off valve 32, from which the fluid flows via channels

controls, which is normally against an annular channels 30 in the piston 28, via the shut-off

Valve seat 34 is pressed with the aid of a spring 36, valve 32 and through the dispensing opening 14 for loading

which flows between the top of the valve 32 and a container. When the pressure builds up in the container

Flange 38 at a lower end of the discharge site builds up, it builds up in a similar manner in the inlet

tion 14 is effective. 30 space 18, and because the pressure forces acting on the

A piston rod 40 acts with the piston 28 on the upper and lower sides of the piston 28,

bonds that are downward in the axial direction and about the same will result in a compressive force

extends outwardly of the outlet port 22; obtained, which takes effect over the area, which

the piston rod surrounds a compression spring 41 which is defined by the outlet valve 24; this

equal pressure between the inner surface of the flange 20 and 35 is also applied through the central channel

the lower side of the piston 28 is effective. The 52 and the radial bores 56 in the groove space

The lower end of the rod 40 has a screw thread 54 fed within the O-ring for this purpose

on, onto which a nut 42 is screwed, which expands outward in the radial direction until

upper end against the lower side of an alignment- the resilient ring in engagement with the vertical one

part 44 rests, which with the lower surface of a 40 wall 48 of the cup-shaped element 46

hollow, cup-shaped element 46 comes together.

acts; the element 46 has an upward standing when the resilient ring 60 protrudes outward annular wall 48, and within which it widens, it approaches the inner annular cup-shaped Component 48, the aforementioned extension 66 is received in an inverted, annular outlet disc-shaped closure piece 25, 45 space 68 in the lower end of the body 10. The upper that on its upper side the annular shut-off wall of the space 68 is also the seat for til 24 has, which by the action of the spring 41, the outlet valve 24, so that when the valve on the piston is shifted to the normal, closed position 24 to the open position, flow loop is pressed. means in the inlet chamber 18 past the valve 24 and

According to the invention, the element 25 is centric 50 then initially along the outside into the atmosphere

provided with a countersunk hole so that one of the wall 66 flows. When the resilient ring 60

enlarged central flow channel 52 formed is shifted close to the wall 66, as in FIG

which surrounds part of the piston rod 40. In fig. As shown in FIG. 2, a constriction 70 arises between

Element 25 is an annular groove 54 of relatively large size of the wall 66 and the slotted ring 60,

Depth formed with the central through-55 whereby the free escape of the fluid in

flow channel 52 through a series of radial channels the atmosphere is prevented, so that it is full

56 is connected. When a pressure in the inlet force over the surface or the disc on the outside of the

space 18 and thus in the groove 54 is present, valve 24 can be enlarged by the additional area that

this is not fixed down between the inner edge by the upper surface of the ring 60,

of the cup-shaped element 46 and the rod 40 60 acts. When suddenly there is a pressure on this whole

due to an O-ring 62 around the inner, upper surface immediately after the valve was torn open

Flow away from the edge of the alignment member 44, as the 24 is exercised, the valve 24 and thus the

F i g. 1 can be found. Piston 28 downward against the upward directional

As can be seen in particular from FIGS. 2 and 3 to be seen ended force of the spring 41 with a snap action

is, the vertical wall 48 of the cup conveyor 6g is displaced, the pressure in the inlet chamber 18 being un-

migen element 46 selected with such a height, indirectly returns to atmospheric pressure and

that the upper edge of the wall 48 on the lower the pressure in the container now down to the

Surface of the groove 54 protrudes; within the groove 54 piston 18 and the shut-off valve 32 acts so that the

Exhaust valve 24 held in its fully open position so that the compressor is relieved if water gets between the compressor and the Inlet space has penetrated, is released into the atmosphere when the valve 24 is in the open Position is moved. As soon as the pressure in the inlet space 18 has fallen to atmospheric pressure, it returns the pressure on the outside of the O-ring 58 is returned to the atmosphere and the resilient ring pulls back inwards approximately into the position shown in FIG. 3.

When the pressure in the container falls below a predetermined value, the spring 41 acts on the Piston 28 in such a way that it moves it upwards against the position in Figure 1; as long as that Valve 24 is open, however, the pressure in the inlet chamber remains at atmospheric pressure, and the ring 60 assumes its retracted position according to FIG. 3. When the valve is in the closed position approaches, the ring 60 no longer represents an enlarged pressure-receiving area, so that there is no longer any danger is that the pressure builds up outside the valve 24 as it approaches the closed position, so clean and positive movement to the fully closed position is hindered so that the Pressure can be released back into the container via the shut-off valve 32 in the manner explained above can. When closing, a snap action is achieved by the close seat of the valve 24, which increases the pressure in space 18 with respect to the atmosphere. Since the area of the piston 28 is larger than the area of valve 24, a snap-shut action of valve 24 occurs upward. if the pressure builds up again in the container and in the inlet chamber 18, it actuates the O-ring again 58 so that it is expanded outward in the radial direction and the slotted ring in his limiting position of Fig. 2 moves, so that an additional area for the snap action of the Valve 24 is provided as soon as it is torn open by the pressure build-up in the container and in the inlet chamber 18 is.

The embodiment in Fig. 4 is in its mode of operation similar to the arrangement according to FIGS. 1 to 3, and the same reference numerals are used for the same parts used, except that instead of a slotted ring an annular helical spring 72 is used, which expands and contracts uniformly over its entire circumference. The spring 72 is made of flexible material on all sides, e.g. B. rubber, embedded and can after expanded on the outside through the O-ring 58 in direct engagement with the annular wall 74 of the outlet space 76 be that a much greater depth than the space 68 in the embodiments according to the Fig. 1 and 3 has. When the coil spring is stretched outward, it closes the top of a vertical, relief-like groove 78 in the side wall 74 very closely, so that after tearing open the Valve 24, the fluid pressure in space 18 acts on the additional area that is created by the outer Diameter of the stretched coil spring 72 is determined so that the valve and the piston be moved downward with a snap action until the inlet space 18 is clear of the outlet opening 22 is in communication with the relief-shaped groove 78, whereupon the inlet space 18 opens Atmospheric pressure returns and the O-ring and coil spring retract inward, so that a free connection is created around the entire circumference of the element 25, which is essential Has smaller diameter than the outlet space, the coil spring 72 and the O-ring remain, as in the first embodiment, in their retracted position until the valve 24 moved to the closed position.

From the above description it follows that a device for automatic adding and Subtracting drive areas is given depending on the need for such areas and that the arrangement according to the invention has a slow or delayed response completely prevents, especially during the closing of the valve, which may be the case if an additional Area exists regardless of whether the valve can be moved to its open position is intended to be moved to a closed position if an additional area is required should if the additional area is not desired.

Claims (6)

Patent claims: 1. Pressure relief and control device with a check valve which is received by a displaceably arranged piston component which divides the interior of the housing into inlet and outlet spaces which are connected to a pressure source and a reservoir, and with a spring-loaded shut-off valve which is coaxial and at a distance from the check valve within an outlet space of the housing which separates the inlet space from the atmosphere, the outlet valve being drivingly connected to the piston component and opening in the direction of the fluid outlet when the cut-off pressure is reached, and a larger effective one in the open position Surface is acted upon by the fluid pressure than in the closed position, characterized in that the closure piece of the shut-off valve (24) is designed as a disk-shaped element (25), the diameter of which is slightly smaller than that of the surrounding cup-shaped wall (66 ; 74) of the outlet space (68; 76), and which is provided with an annular, outwardly open groove (54) which communicates with the inlet space (18) via channels (52, 56), an expandable inside the groove , element (58, 60; 58, 72) displaceable on all sides in the radial direction by the fluid pressure is arranged in a sealing manner, the elastically deformed! State in the immediate vicinity of the surrounding wall of the outlet space (68; 76), the cup-shaped section of which has a small depth compared to the entire stroke of the shut-off valve, is maintained by the pressure that prevails in the inlet space as long as the shut-off valve is in its closed position or the Opening movement begins, and in the de-energized state, it assumes a large radial distance from the surrounding wall when the shut-off valve reaches its open position. 2. Device according to claim 1, characterized in that the displaceable in the radial direction Element has an inner stretchable O-ring (58) which is slidable and sealing with the opposing side surfaces the groove (54) cooperates, and that an outer resilient ring (60; 72) is provided, which is acted upon by the inner O-ring and pressed outwards in the radial direction, if there is a sufficiently high pressure in the inlet space. 3. Device according to claim 2, characterized in that that the outer, resilient ring consists of a split clamping ring (60). 4. Device according to claim 2, characterized in that that the outer, resilient ring consists of an annular helical spring (72), which is embedded on all sides in a flexible material. 5. Device according to claim 4, characterized in that in the wall (74) of the outlet space (76) an axially extending groove (78) is provided, the outer end of which leads into the open and whose inner end is arranged so that the spring (72) moves over it, as soon as the shut-off valve begins its opening movement. 6. Device according to claim 1 or one of the following, characterized in that a cup-shaped element (46) is provided, the diameter of which is larger than that of the disk-shaped Closure piece (25) and its upwardly projecting annular wall (48) one Forms stop for the outer resilient ring (60; 72). 1 sheet of drawings 009 512/138