DE1673591C - Pressure dependent electrical switch - Google Patents

Description

Patent claims:

1. Pressure-dependent electrical switch, with a measuring line fed by a compressed air source, in which a flow or pressure dependent on the measured value occurs, which acts on a movable piston that controls electrical switching means without contact, in such a way that that a supply corresponding to the piston position δο stand of an electrical measuring circuit occurs, characterized in that in one of the comparison line (14) fed to the compressed air source (4) means (8; 15, 42 to 44) for generating a comparison pressure are provided and that the pressure dependent on the measured value and the reference pressure are supplied on opposite sides of the piston (19, 20), the arranged freely movable in a cylinder housing (9) and exclusively the contactless control of the electrical switchgear (28) serves.

2. Switch according to claim Ij, characterized in that that the piston (19j 20) at least in one of its F. end positions lies on a stop surface (22), which is the effective piston surface for partially covers the supplied pressure medium.

3. Switch according to claim 2, characterized in that that the stop surface (22) slight unevenness. z. B. individual slightly raised areas having.

4. Switch according to claim 2 or 3, characterized in that the stop surface (22) on a part, e.g. B. a plug (21) of the cylinder roughness, made of sealing material, λ Β. Soft plastic, is formed.

5. Switch according to one of claims 1 to 4, characterized in that the piston (19. 20) carries a permanent magnet (20) or rather is designed as a sol, which is used for contactless Control of a magnetic field-dependent electronic see element is used.

6. Switch according to one of claims 1 to 4, characterized in that a radiation source, for example radioactive or fluorescent material, is attached to the piston and that a radiation-dependent electronic switching element is provided.

7. Switch according to one of claims I to 4, characterized in that the piston as Control member for controlling one of the control of the switching means serving energy z. B. one magnetic flux, radiation or the like. Is formed.

8. Switch according to one of claims 1 to 4, characterized in that the piston (19 ') as movable core of a differential transformer is formed

9. Switch according to one of claims 1 to 7, characterized in that the length of the piston (19, 20) exceeds its diameter.

10. Switch according to one of claims 1 to 9, characterized in that switch conti'ite (27) are removably arranged at a thin-walled point of a cylinder block (1).

11. Switch according to one of claims 1 to 10, characterized in that a cylinder block (1) is provided with a pressure medium inlet (3) which is connected to both sides of the piston (19, 20) lying cylinder chambers is connected via flow resistances (8), the one cylinder chamber via a regulating valve (15, 16) and the other cylinder chamber via a measuring nozzle (13) communicates with the outside space.

12. Switch according to one of claims 10 or 11, characterized in that the cylinder block (1) one level mounting surface (2)

_. indicates at which the pressure medium inlet (3) is located, T and that the regulating valve (15, 16), the connection for the measuring nozzle (13) and the switch

'. connections (25,26) are arranged on the opposite side.

13. Switch according to one of claims 1 ■ to 12, characterized in that the piston

(19, 20, 190 has a control part (30) which an outlet (32,320 from a cylinder space

1675.591

I The present invention relates to a pressure - Fig. 5 and 6 violins each have a partial section through dependent electrical switch ZHT use in one of the AvisfiJhrHngsvarmriten; _>

| in a pneumatic measuring device, with one of Fig. shows a section through the third section * | Measuring line fed by the compressed air source, in welfare version, and

rather a diameter dependent on the measured value. Fig. 8 shows a section along line VTII-VIII flow or pressure occurs, which on a moving in F i g. 7,

The switch shown in FIG. 1 bib 4 controls without a guide in such a way that one of the piston positions - a cylinder block 1 of L-shaped cross section Jung - corresponds to a state of an electrical measurement (FIG. 3 g, 3 and 4) on. 2 | travel occurs on a flat surface. Known switches of this type have ία of the block 1, a compressed air inlet 3 is provided, a piston acted on on one side, which is in connection with a supply line 4 in a spring force or gravity by the mounting plate 5 according to FIG. On the | USA, patents 2,791,657 and 3,057,977). Several blocks or units of the non-contacting and thus largely next to one another can be arranged on the plate 5, the inlets 3 of which are inefficient control of the switching means here can all be connected to the line 4,
The inlet 3 opens into a channel 6, which is closed off by means of a plug 7 at the end of the case of sensitivity and the occurrence of indeterminate ends. Beid-JBetetrieb von Schaltkoaukten on certain sides of the inlet 3 pressure conditions or certain positions of the or flow resistances 8 are used in the KanJ 7 baffles. The other than JColbens opposite. These known switches can not be understood in differential or bridge measuring systems via millings in connection with each donation. one end of a cylinder space 9 and with one

! In contrast, the connection channel 10 according to the invention and a connection piece Ii pressure-dependent electrical switch is characterized for a measuring line 12 with measuring nozzle 13 and is characterized by the fact that in a channel 14 connected to the compressed air source 25 a control valve containing a channel 14 Generating a regulating valve has a comparison pressure designed as a screw and that the pressure from regulating needle 15, the value measured against the valve seat and the adjustment 16 is adjustable and the threaded sleeve provided with external grooves equal pressure on opposite sides of the cylinder 17 18 is screwed.
In the cylinder chamber 9, a piston is arranged so that it can be moved freely and exclusively the one which is used to control the electrical switching 19 made of non-magnetizable material and a medium from an actual piston body. As a result of the action on both sides, there is a cylindrical permanent magnet 20. The 'of the piston is the highest response speed, permanent magnet 20 is axidl magnetized, as in simplicity and reliability, high sensitivity. 1 indicated. The cylinder space 9 is bilateral and unambiguous addressing and switching by means of plug 21 made of sealing material. eg contacts with sufficient pressure difference at the piston soft plastic, closed. The two plugs reached. The switch can optionally have a raised stop surface 22 in a 21. whose system can be used with a measuring nozzle or a bridge diameter approximately the diameter of the area on system with two measuring nozzles, with the slightly tapered free ends of the piston corresponding to the pressure on one side in the case of a measuring nozzle. In order to avoid an undesirably strong sticking of the piston of the piston by the measuring nozzle, while on the stop surface 22, there is a constant reference pressure on the other side because these surfaces are slightly uneven or rough. trained with individual, slightly raised areas

There are already pneumatic actuators 45 det. The amount of these bumps should, however <Krnrgane or servo controls with double-acting type be small that the gas exchange between juf pistons and with position feedback suggested mutually lying end faces of the piston and Anworuen (German patent specification 854 278. British striking surface: n 22 is disabled.

Patent Specification 1 103 118). These devices are used above the cylinder space is in the recess

however, to drive certain organs, so that the 5 ° of the block 1 a holder 23 made of insulating material a piston are not freely movable The fact alone, set and using screws 24 with the block 1 that double-acting drive pistons are generally screwed up. The holder 23 has two connectors are, does not have the advantages of using flags 25 occupied, the l.jittels screws 26 with the a freely movable, bilaterally acted upon KoI holder 23 are screwed. The screws 26 die-'bcns in a pressure-dependent electrical shoulder 55 η «· η at the same time / around the connection of Ius. The pt- ^ ■ ahegelcgt. spread ends of the connection flags 25 take zv

I- In the following, the invention is art hand; the drawing * see the connections of a switching tube 27 m <• Hung explained in more detail, in which an execution ferromatched Körttakien 28 on.
-bcbeispiel and three execution variants shown The mode of operation of the switch according to FIG. 1 to 4

• ind, So is as follows: In the illustrated rest position of the parts

>', F ί g. 1 shows the exemplary embodiment of the container, the piston 19,2Ö is in its left end in the section along line W in F tg, 2; location, and the nozzle 13 is still quite a bit off '

·; FIG. 2 shows a top view of the scarf from a counter start to be tested, see above }; ter; that are connected to the measuring nozzle

f, F ί g. 3 shows a section along line IIMIt in 65 the space to the left of the piston in cylinder 9 in practice ? Pig, 2; there is no pressure. in any case it is assumed

;, 'F i g. 4 "c'igt a section along line IV * 1V in this was lower than the means of the valve • ■ - the right of the piston · IS ₁ ic \ _m rooms set

a H% RQ

the

Rar piston is thus maintained in the illustrated * ^B "are for this position, the examples 13 v nt 28 of the switch 27 too far away 20 to closed ^ ^ advertising ntlich low.
the application may i measurements *** ™ *>

MU spell forming shift is benfläche the entire Ko, who had been partially covered by the AnschlagflShe22 and on which thus the pressure increase is not fully came into effect, exposed so ™ piston ate definitively to the right accelerated "s bff" r to the right stop surface 22 hits

^d it he

two different values allowed. With this im pig.l corresponding n 19 a rod 30 which in End plug 21 '

, . '. Direction and strength of the M "gend eide both in the loading";,; he the contact = 28 in such a way that d, _it e contacts, however, the left end of the an ^ wtrd of the Gosju, -

M «0v" rrieh, _U n ₈ becomes oei _f p _f -

Upper nozzles 13 the workpiece on a be-S mmte distance from a reference point of Plant-5 is approximated. Is the one in front of a nozzle he-Fläh edited on the right Kote so

^ _after another print

ff ^ $ K _O lbens go, the same in his right end link of the graining ^ ^ _{2g Wied r} g _eo opens

position ^f _d «; _returned movement ^ of the piston

Α SÄ

f yes

^ ndh. it can usually use a switch ^ era ^ ^ _{n Kolbcns}

success and the absence of a switchover shows the _{increasing volume 31} , where-

to the committee. In addition, the magnetic or ^ Stong may 30 «n ^ ^ _ge tjrter _chamfer.

fei Scnalter course be arranged differently so that mri ■ * "A ^ TSEF pressure on the right, Kolbenbei the rest position of the piston shown you: con- 45 nng ^ rü _{The Co] ben} therefore _ntmmt the

_{clock (:} closed and for the other end position of the g ^ _{rhäUnisse left of the} same ^^ fj ^

TsSSErA, with very low inertia with correspondingly high sound _{sequences and also through dcn in Fig}

inen

Piston stroke of 8mm., NdI Pistons,

Claims (1)

■ in- *8th) lin iin .. · ■ φε ml for ckt ι ge κ ψ- ^j 'tt ^! | - 'ircji (22 on 2! les Ii. B. 1 673 Can be used for analog display or discontinuous for the purpose of Digifalanieige regulates, 14; Switch according to Claim 13, characterized in that the piston (19 _s 20; 19) carries a rod (30) with a variable cross section which extends through a cylinder stop (21 '). 15, switch according to claim 1, it has two measuring outputs, which connect to opposite sides of the pressure-sensitive organ, characterized in that both measurement outputs (ίο, 14) have adjustable gas outlet (42 to 45) leading to the connected measuring nozzles lie parallel. 16. Switch according to claim 15, characterized in that that each measuring outlet has an aluminum connection piece (40, 41) for a measuring line, which on a cylindrical part has void radial bore (42) which extends into a Urnfangsfichtüng tapering annular groove (43) mühdetj And that a slotted ring (45) is rotatably arranged on the cylindrical part. 1 sheet of drawings s-ίβ t- _O ft «S room If 509615/2 I 673 to use. A resistance that is dependent on the magnetic field can also be used. The piston can e.g. B. also made of ferromagnetic Material exist and depending on its position a quef to the piston movement extending magnetic S Close or break a circle; Likewise, the bulb can control a beam of light that is intended for one Piston position a Phntozelle is illuminated and is interrupted in the other piston position. The shoulder is practically independent of position, i. that is, it can be either vertical or horizontal, as desired Cylinders are used, with only a certain amount of displacement required for switching Pressure difference occurs. This shift can, however, at any time by means of the valve 15, 16 be compensated. In the embodiment of FIGS. 7 and 8, their Block 1 corresponds to the one according to FIG. 1 to 4, there is also a control valve in channel 14 instead of a regulating valve Connection piece used for a measuring line. The two connecting pieces 40 and 41 are each with one Radial bore 42 provided, which opens at the lowest point of a gradually tapering annular groove 43. The connecting pieces 40 and 41 are provided with radial slots 44 on the cylindrical outer surfaces provided regulating rings 45 snugly, but attached so that they can be rotated by hand. By setting the rings 45 in a specific rotational position, the gas can escape from the nozzle 40 and 41 can be regulated by the bore 42 and the groove 43. This regulation is used for setting a certain initial state when connecting measuring nozzles to both nozzles, in particular in the case of so-called differential measurements, where the two nozzles are caused by movements of the test person Subject to be influenced differentially or in push-pull. Just take the exam as an example mentions the eccentricity or the concentricity of a shaft, which measuring nozzles are placed in front of diametrically opposite points. With such a Measuring arrangement, the highest sensitivities and up to 50 switchings per second are possible. Other designs of the holder are also possible. Is z. B. the device with mains voltage are operated, exposed connections of the in F i g. 1 to 4 are not permitted. In this Case can the switching tube 27 or possibly several such with connecting cables and soldered be arranged cast in a carrier made of insulating material.