DE2123145A1 - Electric switch for pneumatic signals consisting of solenoid valves - Google Patents

Description

3) iftl.-Un ₉ . De. ÖLeiard OCa * «UtU 2123145

PATENT ADVOCATE

May 9, 1971

Anw.-Ak.tei 75.354

PATENT APPLICATION

Applicant; V ^ zkurnny ustav automatizaönich prostfedku, Praha

Title: Electric switch for pneumatic signals consisting of solenoid valves

The invention relates to an electrical switch for pneumatic signals consisting of solenoid valves. It is known that several types of pneumatic signal changeover switches are currently in use »One of which is a multi-position switch, which consists of solenoid valves in a circuit arrangement, each solenoid valve a capacity space for the shock compensation when switching on and one for the faster filling of the measuring chamber needed. An overflow channel leads from each valve to a pneumatic amplifier, in which the pressure is converted into an electrical signal via a corrugated bellows and a current balance. This switch-

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type works extremely slowly (3 seconds per position).

The second type of switch is a mechanical switch with stepper drive and cyclic switching of the pneumatic signals. The entrances are on one circular block attached radially or axially and open onto a circular board, opposite this is a coal disk with an overflow channel, which opens into a single output · In each position of the switch, an input is connected to the output; the rest are closed by the pressed carbon disc. The disadvantage of this disc consists in the complicated generation technology, short life and poor reliability. Even this type of switch does not allow rapid selection of the entry signals, although its speed is considerable is larger than the previous type

Another type of switch for pneumatic signals is a modular switch at where the solenoid valves are arranged in a circle on an octagonal board. The seats of these solenoid valves are countersunk in an octagonal block, and the connecting channels of each valve seat are radial to the Out of the middle of the block, where they open into an axial channel. The individual octagonal arrangements can be stacked on top of one another as required placed and mutually sealed, with them through axial channels to a single outlet are connected. The capacity in the switch is

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very small (approx. 1.5 cm), and this is why it is filled very quickly, so that the toggle switch can evaluate 10 digits per second. One disadvantage is the bad Accessibility of the valves, which are directed backwards when installed in a housing or in a box and in the event of a malfunction in a valve or its replacement, the entire switch be dismantled. If the connection between the individual parts leaks during operation, it is not only necessary the whole changeover switch can be dismantled but also dismantled. In terms of maintenance, this is a disadvantage, which makes rapid maintenance interventions impossible.

The solenoid valves previously used are also proportionate robust and are, due to their dimensions and the large consumption, not suitable for one larger assembly. Although there is already known a solenoid valve with a small size; however this is Can only be used on one side due to its construction. It does not form a functional group; because it is open and has none Valve seat.

The invention is based on the edition mentioned Disadvantages of the known types of switch and solenoid valves by an electric, made of solenoid valves to largely eliminate existing changeover switches for pneumatic signals in pneumatic lines.

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According to the invention, this object is achieved in that the aforementioned type of switch is provided with a connection piece which is connected to a tube made of magnetic material. In this tube, a magnetically conductive casing is slid, in which a coil is mounted with an exciter winding _for further consist of a bobbin of non-magnetic material forming the guide of the movable armature and of a compression spring of the with one end against a deposition Armature and is supported with the second end against the bobbin. The coil has a flat off w leadership as the solenoid valves. The essence of the invention is that the solenoid valves are arranged in several rows on the front of a support plate and their inputs end at the valve seat. The outlets of the valve seats open into a system of collecting and connecting channels on the back of the support plate that has a single outlet into a strain gauge. A seal can be placed between the support plate and the tension plate. The basis of this switch system is the support plate, to which the solenoid valves are screwed in rows on one side and on the other side of which there is a network of channels, into which a vertical, as short as possible channel runs from each valve seat. This network of channels is mutually connected and ends in a single outlet channel through which the measured medium is directed into the strain gauge. Here the pneumatic signal is converted into an electrical

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• transformed A perfect sealing of the network of Connection channels are made by means of a rubber plate, which is enclosed between the support plate and the clamping plate is.

The stopping speed of the solenoid valves "is approx. 100 digits / sec. In view of the filling time of the Capacity of the changeover switch and the actual pneumo-electric converter, the changeover switch is capable of with a switching speed of approx. 50 digits / sec. to work what corresponds to today's top measurement technology »

The solenoid valve can have an armature which, at its lower end, touches an insert, preferably made of rubber which is attached to the valve seat of a plugc It closes the solenoid valve at the bottom and has inside a compression spring. The top of the solenoid valve is terminated by a lock nut in which the connector the pneumatic line is mounted. This connector is with one end in the bobbin, opposite the Anchor, housed. There is an air gap between the lower end of the connecting piece and the armature Ring made of non-magnetic material. Between the connector of the solenoid valve and the spool a sealing ring and a seal can be placed between the bobbin and the plug.

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The solenoid valve for the pneumatic line therefore consists of a connector for the pneumatic line Line that is pushed into the coil of the solenoid valve and, together with the nut and the jacket, the first Forms part of the magnetic circuit. The movable armature forms the second part of the magnetic circuit. Of the The armature is pressed against the valve seat by the compression spring via the rubber insert. Because the solenoid valves easily can be replaced, the inventive electrical switch for pneumatic signals has various advantages regarding maintenance and operation. As with the usual relay switches, the actuation of the electrical Switch of pneumatic signals very simple. The selection of the individual addresses can be arbitrary, the desired According to the program, and any input of the electrical switch to the pneumatic Signals can be connected to the output in any order. The switch can be in different Position as long as the valves are oriented horizontally.

Another advantage of the solenoid valve according to the invention is that it combines the small size with the ability to work like the known ones Valves, which are, however, considerably larger. A structural peculiarity of this solenoid valve is that the coil body, which is made of non-magnetic material, also acts as a sliding guide for the movable armature

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serves. Due to the structural arrangement, this valve forms a functional group, a monoblock.

An embodiment of the invention is shown in the drawing and is described in more detail below. Show it:

Figure 1 is an elevation,

Figure 2 is a side elevation of the switching,

Figure 3 shows the arrangement of the collecting and connecting channels and the terminal strip,

Figure 4 illustrates an example of a solenoid valve for a pneumatic electric changeover switch Signals.

The construction of the switch for pneumatic signals, as illustrated in the figures, allows according to Requires the installation of 1 to 10 rows of solenoid valves in columns A to H · It is one exact analogy of the switch type in modular construction, however, with the difference that instead of the completion of the components for each number of rows the same support plate remains, with only one of its dimensions changes. The limitation of the total number of digits 100 for an assembly is only by the maximum desired

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Switching speed given. If the required If the speed is reduced, the number of digits in an assembly can be increased accordingly.

In FIG. 1, rows of solenoid valves 1, 2, 3, 4, to 10 (or even more), arranged just next to one another on the support plate 17, are shown. Behind the last row, a pneumatic transducer is incorporated with a Dehnungsmeßbrücke 15, for this purpose also a pressure gauge may be employed if it satisfies the operation control even after a longer time interval, the measures

"Print the individual addresses or the specially selected ones Determine addresses. Behind the strain gauge bridge 15 is the terminal strip 16 to which all outputs the solenoid valve coils are connected; Figure 3 shows a rear view of the support plate 17, through which the Sewer network becomes visible. It consists of stronger collecting channels 18 and weaker connecting channels 19 into which Vertical channels of the individual valves open under the strain gauge bridge 15 with a common outlet. The arrangement of the channels ensures the same working conditions given for a valve arranged in any way in the compilation and also a minimal one The total volume of the channels and the switch achieved himself. The whole switch assembly forms a sealed, closed system without consumption of the measured medium occurs.

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FIG. 2 shows a view of the entire assembly of the switch, the built-in solenoid valves with their inlets 12, 13, 14 etc. of the measured medium being visible. ^E ach of the solenoid has seated its own input signal that is passed through the center of the solenoid valve to the valve seat on the movable armature 27 and the signal blocking the path into the channel space. Only with a single solenoid valve that receives an electrical signal will the valve be opened and the measured signal reaches the duct space and after filling, a direct measurement, _{e.g. e} using a manometer, or a conversion of the pneumatic signal into an electrical one can take place « The seal 20 between the front support plate and the rear tensioning plate 11 ensures a complete sealing of the system of collecting channels 18 and connecting channels 19.

FIG. 4 shows a solenoid valve which is suitable for this electrical changeover switch. The entrance part of the solenoid valve consists of the connector 21, which is connected to the pneumatic line will. The air reservoir of the valve is formed by the central bore in the connection piece 21, in the movable armature 27 and the space of the valve seat 32, the air reservoir is through the seal 34 under the bobbin 24 and above this closed by the sealing ring 23. The sealing plug is located at the lower end of the solenoid valve 31, in the middle of which the valve seat 32 is

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is formed. On the valve seat 32 rests the pressing rubber insert 33, against which the armature 27 by means of the spring 35 is pressed, which is supported with the second end against the bobbin 24. The whole valve is housed in the jacket 29, which is closed at the upper end by the locking nut 22. The connector 21 has pushed a bing 25 on the inner end, which is made of brass. This Bing 25 can also between the connecting piece 21 and the armature 27 free "Be inserted. At the lower end of the jacket 29 is a Union nut 30 attached.

The solenoid valves 1 to 10 of the pneumatic line work like this:

The inlet part of the solenoid valves 1 to 10 form the connecting pieces 21 to which the pneumatic line is connected will. The air passes through the central bore of the connector 21, through the bore 28 of the displaceable armature 27 and through the Badialbohrung at the lower end of the armature 27 in the tree of the valve seat. This space is carefully closed by the seal 34 against the bobbin 24 of the solenoid valve. The sealing ring 23 takes place over the coil former 24. The solenoid valve is closed at the lower end by the plug 31, in the middle of which the valve seat 32 is located. On this is the anchor 27 with the rubber

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insert 33 and thus seals the valve chamber, d. H. the input of the pneumatic signal from the output, the is located behind the valve seat 32. The armature 27 is pressed against the valve seat 32 by the compression spring 35 pressed, which is supported at its upper end against the bobbin 24. The jacket 29 of the Solenoiäventile 1 to 10 has at the top of the inner Duceh knife a thread for the locking nut 22, which has an external thread. With this the whole valve system becomes screwed and at the same time the optimal air gap between the connection piece 21 and the armature 2? set · To have a magnetic sticking in the air gap To prevent, a ring 25 made of brass is attached to the end of the connecting piece 21, which on the connecting piece 21 is pushed or placed freely between the armature 27 and the connecting piece 21 and so their direct Contact prevented. At the lower end of the jacket 29 is a step with an external thread for the union nut 30. Si * is used to attach the solenoid valves 1 to 10.,

The actuation of the solenoid valves 1 to 10 takes place through voltage connection to the execution % of the winding of the coil 26. When the voltage is connected, the armature 27 is raised and opens the passage through the valve seat 32, ie into the output for actuation, regulation or measurement. After the tension has been removed, the armature returns to its original position through the action of the compression spring 35

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Location back. The sealing of the solenoid valves 1 to 10 is guaranteed in both directions when there is overpressure. A cap 37 is pushed over the connecting piece 21, which partially covers the jacket 29 and serves to close off the solenoid valves 1 to 10 and as a holder for the versions%.

According to the invention, the electrical switch for pneumatic signals consisting of solenoid valves can for example be used in calculating machines, measuring centers, etc. «The solenoid valve for pneumatic lines can, as a result its small dimensions, not only for the specified changeover switch use, but primarily for purposes of measurement, regulation and actuation,

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Claims (4)

-13- 2123U5 PATENT CLAIMS: 1o ^ Electric. changeover switch consisting of solenoid valves for pneumatic signals in pneumatic lines, "consisting of a connecting piece that connected to a tube made of magnetic material and pushed over a magnetically conductive jacket is in which the coil of an excitation winding is located. Furthermore from the bobbin made of non-magnetic Material that guides a sliding armature, a compression spring that moves with one end is supported against a projection of the armature and the other end against the coil body, characterized in that the solenoid valves are in at least one row at the front a support plate (17) are arranged and lie in one plane, the inputs (12, 13, 14) of this Solenoid valves lead to valve seats (32), the outputs of which in a system of collecting channels (18) and Connecting channels (19) end on the back of the support plate (17) and have a single joint Have output in a strain gauge bridge (15). 2. Electric switch consisting of solenoid valves for pneumatic signals according to claim 1, characterized in that between the support plate (17) and the clamping plate (11) a seal (20) is placed. 109848/1368 - 14 - 2123U5 3. Electric switch consisting of solenoid valves for pneumatic signals according to Claims 1 and 2, characterized in that the solenoid valves (1 to 10) have their armature (27) arranged so that they are at the lower end with are in contact with the rubber insert (33) which rests on the valve seat (32) of the plug (3D, in which a compression spring (35) is attached and which closes the solenoid valve from below, while the upper part through the lock nut (22) * is closed, in which the connector (21) of the pneumatic line rests, -wherein the connecting piece (21) with one end in the bobbin (24) opposite the Anler (27) is attached and that between the lower end of the connection piece (21) and the anchor (27) in a ring (25) made of non-magnetic material is placed in the air gap 4. Electric switch consisting of solenoid valves for pneumatic signals according to Claims 1 to 3f, characterized in that between the connection piece (21) of the solenoid valves (1 to 10) and the bobbin (24) a sealing ring (23) and between the bobbin (24) and the plug (3D a seal (34) is placed. 109848/1368 Blank page