EP0883147A2 - Hydraulic or pneumatic pressure differential electric switch - Google Patents
Hydraulic or pneumatic pressure differential electric switch Download PDFInfo
- Publication number
- EP0883147A2 EP0883147A2 EP98110071A EP98110071A EP0883147A2 EP 0883147 A2 EP0883147 A2 EP 0883147A2 EP 98110071 A EP98110071 A EP 98110071A EP 98110071 A EP98110071 A EP 98110071A EP 0883147 A2 EP0883147 A2 EP 0883147A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- switch
- electric switch
- electric
- spring
- movable
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
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Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H11/00—Apparatus or processes specially adapted for the manufacture of electric switches
- H01H11/0006—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches
- H01H11/0012—Apparatus or processes specially adapted for the manufacture of electric switches for converting electric switches for converting normally open to normally closed switches and vice versa
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H35/00—Switches operated by change of a physical condition
- H01H35/24—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow
- H01H35/38—Switches operated by change of fluid pressure, by fluid pressure waves, or by change of fluid flow actuated by piston and cylinder
Definitions
- the present invention relates to a hydraulic or pneumatic pressure differential electric switch.
- a further drawback is that the mentioned pressure differential electric switches are very complex construction-wise, and have a very high cost.
- the aim of the present invention is to overcome the above mentioned drawbacks, by providing a hydraulic or pneumatic pressure differential electric switch having a very small size and which, consequently, can be easily installed in a lot of operating systems.
- a main object of the present invention is to provide such an electric switch which comprises a small number of component elements, thereby reducing both the assembling complexity and the wearing and damaging possibilities thereof.
- a further object of the present invention is to provide such a switch which can electrically operate as a pressure differential, either of a positive, or possibly even of a pulsating type, between two environments, occurs.
- a further object of the present invention is to provide such an electric switch which, owing to its specifically designed constructional features, is very reliable and safe in operation.
- Yet another object of the present invention is to provide such an electric switch which is very competitive from a mere economic standpoint.
- a hydraulic or pneumatic pressure differential electric switch characterized in that said switch comprises a switch body, defining a chamber herein which can be arranged between two hydraulic or pneumatic pressurized regions, in said chamber being tightly movable, under the pressure differential between said two regions, a movable electric contact, cooperating with a fixed electric contact supported by said switch body through a dielectric spacer element, counter-biassing resilient means operating on said movable electric contact being moreover provided.
- the subject switch which is generally indicated by the reference number 1, comprises a switch body 2 defining therein a chamber 3 which, through respective inlets 4 and 5, communicates with two hydraulically or pneumatically pressurized regions 6 and 7.
- a sealing annular or ring-like element 8 for properly tightly separating the regions 6 and 7, is provided.
- a movable electric contact 10 which is substantially formed by a small piston affected by resilient means comprising, for example, a spring 11.
- said movable contact 10 cooperates with a fixed contact 12, the latter being supported by the switch body 2 through a dielectric spacer element or shim 13.
- the electric switch is herein shown in a normally closed condition.
- the pressure differential being absent, the movable contact 10, electrically contacting the switch body 2, closes the circuit, by contacting the fixed contact 12.
- FIG 3 illustrates a conceptually identical electric switch, the sole difference being that the switch body 1 is directly formed on the equipment thereon the electric switch is assembled.
- the operating difference between the normally open electric switch and the normally closed switch can be merely obtained by reversing the position of the spring 11 and the plunger or movable contact 10.
- the fixed electric contact herein indicated by 20, can comprise a proximity sensor, of a per se known type, for example a magnetic, inductive or capacitive sensor, adapted to open or close or reverse the inner contacts, as the movable electric contact 10, which can optionally include a magnet 21, is moved away or toward the proximity sensor, under the differential pressure generated between the mentioned two regions 6 and 7.
- a proximity sensor of a per se known type, for example a magnetic, inductive or capacitive sensor, adapted to open or close or reverse the inner contacts, as the movable electric contact 10, which can optionally include a magnet 21, is moved away or toward the proximity sensor, under the differential pressure generated between the mentioned two regions 6 and 7.
- the sole electrically conductive element will be constituted by the proximity sensor.
- the electric switch according to the invention will allow to preset the opening and closing time of the switch, with respect to the pressure differential, by simply determining the load on the spring, both with a preset spring, and varying the preload thereon by arranging a spacer element or shim 30 in the bearing region of the end of the spring, as is schematically shown in figure 7, and continuously varying the preset value of the preload, by a threaded ring nut 31, affected by the spring 11.
- dielectric spacer or shim element 13 can be made in different colors, thereby providing a sort of codifying of the spring 11 load.
- the electric switch according to the invention is particularly suitable for application in apparatus operating as filtering apparatus, as well as in reciprocating hydraulic pumps, of the pulsating pressure type.
- the electric switch according to the invention allows to obtain a very great reduction of space and cost, due to the very reduced number of the component elements thereof and due to their very simple configurations.
- Another important feature of the present device is that it would allow to easily control the hydraulic operation of one or more circuits, by simply monitoring the actual pressure differential.
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Switches Operated By Changes In Physical Conditions (AREA)
- Braking Systems And Boosters (AREA)
- Fluid-Pressure Circuits (AREA)
Abstract
Description
Claims (13)
- A hydraulic or pneumatic pressure differential electric switch, characterized in that said switch comprises a switch body, defining a chamber herein which can be arranged between two hydraulic or pneumatic pressurized regions, in said chamber being tightly movable, under the pressure differential between said two regions, a movable electric contact, cooperating with a fixed electric contact supported by said switch body through a dielectric spacer element, counter-biassing resilient means operating on said movable electric contact being moreover provided.
- An electric switch, according to the preceding claim, characterized in that said switch body is tightly coupled to an apparatus thereon said electric switch is applied.
- An electric switch, according to the preceding claims, characterized in that said switch body is defined by the apparatus the electric switch is applied to.
- An electric switch, according to one or more of the preceding claims, characterized in that said resilient means and movable electric contact can be positionally interexchanged, in order to provide either a normally closed or a normally open electric switch.
- An electric switch, according to one or more of the preceding claims, characterized in that said movable electric contact comprises a small piston or plunger which can be tightly driven in said chamber.
- An electric switch, according to one or more of the preceding claims, characterized in that said resilient means comprise a spring.
- An electric switch, according to one or more of the preceding claims, characterized in that said fixed electric contact comprises a proximity switch, the proximity switch actuator being provided on said movable electric contact.
- An electric switch, according to one or more of the preceding claims, characterized in that said electric switch comprises preloading means for preloading said spring.
- An electric switch, according to one or more of the preceding claims, characterized in that said spring preloading means comprise a shim element, arranged in the bearing region for one end portion of said spring.
- An electric switch, according to one or more of the preceding claims, characterized in that said spring preloading means comprise a threaded ring-nut operating on said spring.
- An electric switch, according to one or more of the preceding claims, characterized in that said dielectric spacer or shim element is variably colored in order to codify the preload of said spring.
- An electric switch, according to one or more of the preceding claims, characterized in that said electric switch is applied to a filtering apparatus.
- An electric switch, according to one or more of the preceding claims, characterized in that the apparatus thereon said electric switch is assembled comprises a pulsating pressure reciprocating hydraulic pump.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT97PV000007 IT243620Y1 (en) | 1997-06-03 | 1997-06-03 | ELECTRIC CIRCUIT BREAKER WITH HYDRAULIC OPNEUMATIC PRESSURE |
ITPV970007U | 1997-06-03 |
Publications (3)
Publication Number | Publication Date |
---|---|
EP0883147A2 true EP0883147A2 (en) | 1998-12-09 |
EP0883147A3 EP0883147A3 (en) | 1999-08-11 |
EP0883147B1 EP0883147B1 (en) | 2005-09-14 |
Family
ID=11397383
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19980110071 Expired - Lifetime EP0883147B1 (en) | 1997-06-03 | 1998-06-03 | Hydraulic or pneumatic pressure differential electric switch |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0883147B1 (en) |
DE (1) | DE69831529T2 (en) |
ES (1) | ES2251050T3 (en) |
IT (1) | IT243620Y1 (en) |
Cited By (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1293586C (en) * | 2003-09-28 | 2007-01-03 | 沈鍀桓 | Vernier fluid control switch |
ITMI20111057A1 (en) * | 2011-06-13 | 2012-12-14 | Renzo Oldani | EQUIPMENT FOR THE SECTIONING OF AN ELECTRICITY FLOW IN ONE OR MORE CONDUCTORS. |
CN115692050A (en) * | 2022-09-07 | 2023-02-03 | 中国科学院电工研究所 | Switching mechanism of pulse heavy current switching device |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2335073A (en) * | 1940-12-27 | 1943-11-23 | United Aircraft Corp | Pressure actuated switch |
US2772409A (en) * | 1952-01-22 | 1956-11-27 | Smiths Jacking Systems Ltd | Pressure responsive flow indicator |
US3154049A (en) * | 1962-02-19 | 1964-10-27 | Screen Products Inc | Magnetic pressure indicator |
US4480160A (en) * | 1982-08-31 | 1984-10-30 | Donaldson Company, Inc. | Differential pressure switch |
US4614849A (en) * | 1985-04-18 | 1986-09-30 | Lectron Products, Inc. | Electrical pressure switch |
US5187337A (en) * | 1990-10-23 | 1993-02-16 | Atsugi Unisia Corporation | Fluid pressure actuated switch for fluid pump |
-
1997
- 1997-06-03 IT IT97PV000007 patent/IT243620Y1/en active
-
1998
- 1998-06-03 ES ES98110071T patent/ES2251050T3/en not_active Expired - Lifetime
- 1998-06-03 EP EP19980110071 patent/EP0883147B1/en not_active Expired - Lifetime
- 1998-06-03 DE DE69831529T patent/DE69831529T2/en not_active Expired - Lifetime
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US2335073A (en) * | 1940-12-27 | 1943-11-23 | United Aircraft Corp | Pressure actuated switch |
US2772409A (en) * | 1952-01-22 | 1956-11-27 | Smiths Jacking Systems Ltd | Pressure responsive flow indicator |
US3154049A (en) * | 1962-02-19 | 1964-10-27 | Screen Products Inc | Magnetic pressure indicator |
US4480160A (en) * | 1982-08-31 | 1984-10-30 | Donaldson Company, Inc. | Differential pressure switch |
US4614849A (en) * | 1985-04-18 | 1986-09-30 | Lectron Products, Inc. | Electrical pressure switch |
US5187337A (en) * | 1990-10-23 | 1993-02-16 | Atsugi Unisia Corporation | Fluid pressure actuated switch for fluid pump |
Cited By (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
CN1293586C (en) * | 2003-09-28 | 2007-01-03 | 沈鍀桓 | Vernier fluid control switch |
ITMI20111057A1 (en) * | 2011-06-13 | 2012-12-14 | Renzo Oldani | EQUIPMENT FOR THE SECTIONING OF AN ELECTRICITY FLOW IN ONE OR MORE CONDUCTORS. |
WO2012176222A1 (en) * | 2011-06-13 | 2012-12-27 | Energy Global Green Solutions S.P.A. In Forma Abbreviata Eggs. S.P.A. | An apparatus for sectioning an electric energy flow in one or more conductors, and an electric energy generating plant comprising said apparatus |
US9013070B2 (en) | 2011-06-13 | 2015-04-21 | Energy Global Green Solutions S.P.A. | Apparatus for sectioning an electric energy flow in one or more conductors, and an electric energy generating plant comprising said apparatus |
CN115692050A (en) * | 2022-09-07 | 2023-02-03 | 中国科学院电工研究所 | Switching mechanism of pulse heavy current switching device |
CN115692050B (en) * | 2022-09-07 | 2023-08-15 | 中国科学院电工研究所 | Switching mechanism of pulse high-current switching device |
Also Published As
Publication number | Publication date |
---|---|
ITPV970007U1 (en) | 1998-12-03 |
ES2251050T3 (en) | 2006-04-16 |
DE69831529T2 (en) | 2006-07-13 |
ITPV970007V0 (en) | 1997-06-03 |
EP0883147B1 (en) | 2005-09-14 |
IT243620Y1 (en) | 2002-03-05 |
DE69831529D1 (en) | 2005-10-20 |
EP0883147A3 (en) | 1999-08-11 |
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