JPH0120766B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a pressure regulator for controlling operating pressure, which comprises: a pressure regulator casing comprising a casing bottom and a casing cover; and a stationary valve fixed to the pressure regulator casing. a movable tubular valve seat coaxially adjustable with respect to the fixed valve seat; and a valve closing member cooperating with said valve seats and loaded in the closing direction by a spring. a double-seat valve, which is fixed to the movable valve seat and cooperates with the casing bottom on one side to form a pressure conversion chamber connected to the output utilization side, and on the other side with the casing cover; a piston cooperating to form an outside air chamber open to the atmosphere; a leaf spring extending transversely at right angles to the axis of said two-seat valve, i.e. in the diametrical direction of said piston; and a leaf spring coaxial with said axis. an adjustment ring rotatably disposed on the leaf spring; and a setting screw that engages the leaf spring along the axis, is adjustable in the axial direction, and is capable of setting the spring force of the leaf spring; The outside air chamber is configured to be able to communicate with the pressure conversion chamber via a passage passing through the piston due to the spacing of the tubular movable valve seat from the valve closing member in contact with the stationary valve seat, Moreover, the present invention relates to a type in which communication between the pressure conversion chamber and the pressure source is controlled by the valve closing member and the fixed valve seat. Although this type of pressure regulator is designed for regulating vacuum, it can in principle also be used for other pressure media. However, if the pressure medium is overpressured, the pressure regulator can only be used conditionally.

It is already known from DE 26 39 720 that a double-seat valve extends into the overpressure chamber and has an outer valve seat fixed to the housing and a movable inner valve seat. However, in this case the piston is adjustable by a screw mechanism. Although this structure functions reliably under all operating conditions, it requires a relatively large number of components. This is a drawback that should be avoided at all costs in mass production, and this drawback has been successfully eliminated by the present invention.

Thus, the means of the invention which eliminates the aforementioned drawbacks in pressure regulators of the aforementioned type is that the stationary valve seat is an outer valve seat surrounding a movable valve seat, the outer valve seat being located in an overpressure chamber communicating with a pressure source. recessed, the piston having at least two cam surfaces sloping upward in the direction of the axis on the side remote from the movable valve seat and in diametrically opposed positions;
Both end portions of the leaf spring are in contact with the cam surface, and the both end portions are fitted radially into axial slots provided in the adjustment ring and rotated together with the adjustment ring in the axial direction as well. It is movable and the setting screw is screwed through the adjustment ring.

The arrangement according to the invention has the advantage that it is easy to adjust and can also be used for overpressure with very little outlay. Additionally, the ends of the leaf spring pressed against the cam surface of the invention by the setting screw are axially slidable within the two slots of the rotatable adjustment ring, so that the adjustment ring can be moved in one direction or the other. By rotating in the other direction, it becomes possible to easily and reliably change the control pressure in the pressure conversion chamber via the leaf spring that slides in the axial direction.

The embodiment according to claim 2 provides a reliable function and a simple construction of the pressure regulator. If the pressure regulator is configured as claimed in claim 3, the double-seat valve in particular can be effectively used against harmful constituents such as dust and foreign bodies without incurring significant excess costs. protected.

Next, embodiments of the present invention will be explained in detail with reference to the drawings.

The pressure regulator has a plastic casing 10
The casing consists of a bottom part 11 and a cover 12 fixed to the bottom part. bottom 11
contains almost all the important parts of the pressure regulator in its inner chamber, and the cover 12 covers the bottom part 11.
is covered on the outside. Inside the bottom 11,
An outer valve seat 14 is arranged, which is fixed to the housing, and adjoins this valve seat a cylindrical overpressure chamber 13, into which a connecting hole 15 opens. The connecting hole communicates via a conduit 16 with a schematically illustrated overpressure source 17 . An insert filter 36 fitted in the connection hole 15 protects the overpressure chamber 13 from dust.

A piston 20 is disposed slidably only in the axial direction in a cylinder bore 18 which extends coaxially to the axis 19 of the outer valve seat 14 . A tubular inner valve seat 21 projects from this piston 20,
The inner valve seat extends concentrically into an outer valve seat 14 fixed to the casing. Valve closing member 23
together with both the inner and outer valve seats 14 and 21 form a two-seat valve, in which case the spring 22 supported by the closure plug 24 keeps the valve closing member 23 pressed against the outer valve seat 14 at all times. keep. Piston 20 has two opposed cam surfaces 32, both having axially varying slopes.

The piston 20 together with the bottom part 11 forms a pressure conversion chamber 26.
A connection hole 27 extends from the pressure conversion chamber to an external load device (not shown). Further, a passage 28 reaching the outer valve seat 14 is bored inside the piston 20, and this passage is connected to the insert filter 2.
9 covers.

An adjusting ring 30 having an operating notch 31 is arranged rotatably in the casing 1 about an axis 19 and is located in the first and second axial slots 2.
5. A leaf spring 33 rests on both cam surfaces 32 of the piston 20 and its ends are slidably guided within the axial slot 25. The setting screw 35 is aligned with the axis 1 within the adjustment ring 30.
The leaf spring 33 is arranged coaxially with respect to the leaf spring 33.
It is crimped to the center part of.

The pressure regulator works as follows, namely:
For example, in the illustrated position, an accumulated pressure of 0.5 bar prevails in the overpressure chamber 13 and a control pressure of 0.1 bar prevails in the pressure conversion chamber 26. Double seat valve 14, 21, 2
3 is closed, the pressure conversion chamber 26 does not communicate with the overpressure chamber 13, and also does not communicate with the outside air 39 via the outside air chamber 37.

In order to change the control pressure, the adjusting ring 30 is rotated by a predetermined angle in one direction or the other. If the spring force of the leaf spring 33 then decreases, the control pressure moves the piston 20 away from the valve closing member.

In this way, the pressure is applied to the double-seat valve 14 in a state of force equilibrium.
Pressure conversion chamber 26 until valves 21 and 23 close again.
and escapes into the outside air chamber 37.

Conversely, when the spring force of the leaf spring 33 increases due to the rotation of the adjusting ring 30, the leaf spring presses against the piston 20, causing the inner valve seat 21 to press the valve closing member 23 against the outer valve seat. 14. Air now flows from the overpressure chamber 13 into the pressure conversion chamber 26 and increases the control pressure until the two-seat valves 14, 21, 23 are closed by force balance.

If the pressure regulator has to be adjusted, this is done by correspondingly turning the setting screw 35, so that the setting spring force of the leaf spring 33 is increased or decreased. An increase in the set spring force results in a higher control pressure in the pressure conversion chamber 26, and a decrease in the set spring force results in a lower control pressure.

[Brief explanation of drawings]

The drawing is an enlarged axial cross-sectional view of a pressure regulator as an embodiment of the present invention. 10...Casing, 11...Bottom, 12...
Cover, 13... Overpressure chamber, 14... Outer valve seat, 1
5... Connection hole, 16... Conduit, 17... Overpressure source,
18... Cylinder hole, 19... Valve seat axis, 20
... Piston, 21 ... Inner valve seat, 22 ... Spring, 23 ... Valve closing member, 24 ... Obstruction plug, 25
...Axial slot, 26...Pressure conversion chamber, 27
... Connection hole, 28 ... Passage, 29 ... Insert filter, 30 ... Adjustment ring, 31 ... Operation notch, 32 ... Cam surface, 33 ... Leaf spring, 35 ...
...Setting screw, 36...Insert filter, 37
...Outdoor air chamber, 39...Outside air.

Claims (1)

[Claims] 1. A pressure regulator for controlling operating pressure, comprising: a pressure regulator casing 10 consisting of a casing bottom 11 and a casing cover 12; and a fixed valve seat fixed to the pressure regulator casing. 14, a tubular movable valve seat 21 coaxially adjustable with respect to the fixed valve seat, and a valve that cooperates with the valve seats 14, 21 and is loaded in the closing direction by a spring 22. a two-seat valve consisting of a closing member 23; a pressure conversion chamber 26 fixed to the movable valve seat 21 and cooperating with the casing bottom 11 on one side and connected to the output utilization side; On the other side, a piston 2 which cooperates with the casing cover 12 to form an outside air chamber 37 communicating with the atmosphere.
0; a leaf spring 33 extending in a transverse direction perpendicular to the axis 19 of the two-seat valves 14, 21, 23, that is, in the diametrical direction of the piston 20, and rotating coaxially with respect to the axis 19; a setting screw 35 which engages the leaf spring 33 along the axis 19 and is axially adjustable and capable of setting the spring force of the leaf spring; , the outside air chamber 37 connects the tubular movable valve seat 2 from the valve closing member 23 in contact with the stationary valve seat 14;
It is configured to be able to communicate with the pressure conversion chamber 26 via a passage 28 penetrating the piston 20 with a spacing of 1. The communication between the chamber 26 and the pressure source 17 is controlled, and the fixed valve seat 14 is an outer valve seat surrounding a movable valve seat, and the outer valve seat is an overflow valve in communication with the pressure source 17. It has entered the pressure chamber 13 and the piston 20
has at least two cam surfaces 32 sloped upward in the direction of the axis 19 on the side remote from the movable valve seat 21 and at positions facing each other in the diametrical direction; Both ends of the adjusting ring 33 are in contact with each other, and the both ends are fitted in the radial direction into the axial slots 25 provided in the adjusting ring 30, and are movable in the axial direction while rotating together with the adjusting ring, A pressure regulator characterized in that the setting screw 35 is screwed through the adjusting ring 30. 2. The pressure source is an overpressure source 17, and one filter 29, 3 is provided for the outside air 39 and the overpressure source 17, respectively.
6. The pressure regulator according to claim 1, wherein the pressure regulator is dust-proofed by the pressure regulator 6. 3 Inside the connection hole 15 of the overpressure chamber 13 and the piston 20
3. A pressure regulator according to claim 2, in which insert filters 36, 29 are arranged.