Fluid handling – Pressure modulating relays or followers
Patent
1985-06-13
1987-04-21
Cohan, Alan
Fluid handling
Pressure modulating relays or followers
G05D 1600
Patent
active
046588493
DESCRIPTION:
BRIEF SUMMARY
The present invention relates to an improvement in pneumatic sensors for the control of pneumatic cycles.
Pneumatic sensors, forming the subject matter in particular of British Pat. No. 1 428 887, are known, in which a liquid jet vacuum pump is used, supplied at the input by a compressed air circuit and connected at the output to a nozzle of which obturation provokes a rise in pressure in the vacuum pump which is transmitted to a pneumatic relay capable of transmitting a pneumatic signal. However, the pneumatic relay is very complex and comprises an assembly of diaphragms and valves.
In order to overcome this drawback, a much simplified device giving very good results is used according to the invention.
According to the invention, the space comprised between the jets of the vacuum pump is connected on the one hand to an output orifice emitting the control signal and on the other hand to an airing valve which, open during the ejection leakage, admits the atmospheric pressure in the space, the output and the duct preventing the creation of a depression and which is closed during obturation of the leakage, the supply pressure delivering and being established in the output, the duct thus forming the pneumatic pressure signal.
The device according to the invention therefore makes it possible to replace a relay or a "yes" cell by a valve annulling the depression of the vacuum pump and thus allowing, in simple manner, the use of a vacuum pump for the emission of control signal of a pneumatic component.
The device presents considerable simplicity as it allows the use of unions instead of complex apparatus with diaphragms, seats and multiple valves.
The rise in pressure and the signal are obtained by the obturation of the leakage circuit which may be a simple orifice but also leakage contactors of all types.
The leakage circuit may be integrated in the end-of-stroke switch apparatus employing signal but it may also be controlled electrically or pneumatically.
The signal emitted by the sensor may actuate by remote control all conventional distributor apparatus of all types.
The pneumatic signal emitted may be integrated in the apparatus and it may be converted into an electrical signal.
Finally, the device allows a rapidity of decontrol by limited aspiration.
Other characteristics and advantages of the invention will be more readily understood on reading the following description of several embodiments and with reference to the accompanying drawings, in which:
FIG. 1 is a view in section of a pneumatic sensor according to the invention connected to a pneumatic circuit comprising a jack and its distributor and also another distributor.
FIG. 2 is a view in section of a variant embodiment of a pneumatic sensor according to the invention.
FIG. 3 is a view of a pneumatic circuit comprising a sensor in the form of a union.
FIG. 4 is a view in elevation of a sensor in the form of a banjo union.
FIGS. 5 and 6 are views of a pneumatic circuit provided with the sensor shown in FIG. 4.
FIG. 7 is a view in elevation of a sesnor in the form of a T-union.
FIG. 8 is a view of a pneumatic circuit provided with the sensor shown in FIG. 7.
FIG. 9 is a view in section of an embodiment of the leakage nozzle.
FIGS. 10 and 10a are views in section of a leakage nozzle comprising a valve and a ball control.
FIGS. 11 and 11a are views in section of a sensor comprising a means for obturating the leakage nozzle provided with a control roller.
FIGS. 12 and 12a are views in section of a sensor integrated in an apparatus with a leakage nozzle and an obturator.
FIG. 13 is a view in section of a distributor provided with integrated pneumatic sensors.
FIG. 14 is a view in section of a distributor comprising an integrated sensor controlling obturation of the leakage by an electrical means.
FIG. 15 is a view in section of a sensor in the form of a union controlling obturation of the leakage by an electrical means.
FIG. 16 is a view in section of a sensor comprising an electrical output signal.
FIG. 1 shows an embodiment of a pneumatic sensor accordin
REFERENCES:
patent: 3378022 (1968-04-01), Sorenson
patent: 3699991 (1972-10-01), Munch
patent: 3812873 (1974-05-01), Laakaniemi
Fluidtechnik Journal, vol. 8, No. 2, pp. 76, 77.
Legris Andre
Levenez Yves
Cohan Alan
Societe anonyme dite Legris
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