WO1996004538A1 - Dispositif de mesure de la pression en differents points de mesure - Google Patents
Dispositif de mesure de la pression en differents points de mesure Download PDFInfo
- Publication number
- WO1996004538A1 WO1996004538A1 PCT/FR1995/001058 FR9501058W WO9604538A1 WO 1996004538 A1 WO1996004538 A1 WO 1996004538A1 FR 9501058 W FR9501058 W FR 9501058W WO 9604538 A1 WO9604538 A1 WO 9604538A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- orifice
- plug
- inlet
- measuring device
- sealing means
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01L—MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
- G01L19/00—Details of, or accessories for, apparatus for measuring steady or quasi-steady pressure of a fluent medium insofar as such details or accessories are not special to particular types of pressure gauges
- G01L19/0007—Fluidic connecting means
- G01L19/0015—Fluidic connecting means using switching means
Definitions
- the present invention relates to a device for measuring the pressure at various measurement points of an installation, for example in a refrigeration compressor equipment. These measurements are then used for display, for a comparison of the measurements for regulation, for memorizing the variations of the measurements over time, etc.
- the object of the present invention is to provide a device which makes it possible to limit the number of sensors necessary for measuring the different pressures.
- the one described in the first of these two documents comprises a body provided with a housing into which open, on the one hand, an outlet orifice connected to a pressure sensor and, on the other hand, a plurality of orifices inlet respectively connected to the measurement points, and, in said housing, a plug provided for placing successively in communication, during its rotation, the outlet orifice with the inlet orifices.
- the plug By placing the outlet orifice in succession with each of the inlet orifices, the plug allows the pressures present at the various measurement points to be successively transmitted to a single pressure sensor.
- Sealing means are already known, in particular those which are described in document DE-A-3 119 858. They consist, for each inlet orifice, of a pad of flexible material mounted coaxially between said orifice. A spring is provided to exert a resultant force on the pellet so that the front face of the latter is in contact with the internal wall of the plug and thus ensures the seal between the plug and the inlet orifice. it will be noted that it is also possible to provide such a pellet on the plug.
- the pellets made of flexible material have the disadvantage of wearing out quickly during the rotation of the plug. This wear results from the friction of the pellet on the wall of the plug but also of the deformation which it undergoes during rotation, deformation causing, on the one hand, leaks between the inlet orifice and the plug and, on the other hand, shearing forces which can, in the long term, cause it to break. These drawbacks are aggravated by the relative extent of the contact area between the pellet and the plug.
- the friction of the pellets on the wall of the plug substantially increases the resistive torque of the device.
- sealing means made up of pellets are not entirely satisfactory when the pressure difference between two neighboring inlet orifices is high. This can be the case in particular if the pressure measurement device is used on a compressor of a refrigeration installation to measure the low, intermediate, and high pressures of the refrigerant, the differences of which can be several tens of bars.
- the object of the invention is therefore to provide a device for measuring the pressure at different points which solves the reliability problems mentioned above and which allows measurements to be made for relatively large differential pressures and for fluids of the types different.
- a device for measuring the pressure at different measurement points is characterized in that it comprises sealing means which are provided for closing each inlet orifice when it is not in communication with the outlet.
- said plug is provided with a cam for actuating said sealing means so allow the communication of an inlet orifice with the outlet orifice.
- the sealing means consist, for each inlet orifice, of a drawer which can slide in housings of the body, said drawer then being able to assume an open position in which it communicates the corresponding inlet port with the outlet port.
- Said drawers can slide under the action of the rotating plug.
- Return means are provided to return each drawer from its open position to a rest position in which it closes the corresponding outlet orifice.
- said return means consist of a cam follower or a spring.
- the sealing means consist of valves located in each inlet orifice.
- each valve is provided so that its opposite faces can rest, depending on the pressures prevailing on said faces, either on a seat or on another seat, said seats being opposite one another and provided in the corresponding inlet port.
- FIG. 2b is a partial longitudinal section of sealing means which are an alternative embodiment of the first embodiment shown in FIG. 2a
- FIG. 3a is a partial cross section along the plane 111 / III of FIG. 4 of sealing means according to a second embodiment of the invention, said sealing means being in a first position
- FIG. 3b is a partial cross section along the plane III / III of FIG. 4 in which said sealing means are in a second position
- FIG. 4 is a longitudinal section of a pressure measuring device according to another embodiment.
- FIG. 1 a pre ⁇ sion measurement device using sealing means according to the prior art.
- This device is shown in FIG. 1 and essentially consists of a plug 1 housed in a body 2.
- Said body 2 shown in FIG. 1, is a hollow cylindrical body provided with a cover 2a, a bottom 2b and a side wall 2c.
- Said body 2 comprises, in a first radial plane PI, an outlet orifice 20a and, in a second lower radial plane P2, in FIG. 1, in the first radial plane PI, a plurality of inlet orifices 20j, 20 2 , 20 3 and 2O4, here four in number (only two are visible in FIG. 1).
- Said inlet orifices 20 1 to 20 4 are angularly spaced regularly on said second radial plane P2 of the body 2. They could be in number other than four, for example two, three, five, etc.
- Said plug 1 has the shape of a full cylinder. It has a groove 10 in the radial plane PI of the upper part, in FIG. 1, of the plug 1.
- Said plug 1 also comprises a duct 11, one end of which 11a opens into the groove 10, and the other end 11b of which opens outside of the plug 1, below the groove 10.
- a portion 11 'of the conduit 11 follows the axis of the plug 1. On either side of this portion 11' of the conduit 11, said conduit 11 extends perpendicularly so as to join the ends 11a and 11b.
- the groove 10 of the plug 1 is provided in the first radial plane
- the end 11b of the conduit 11 of the plug 1 is provided in the second radial plane P2 so as to be able to be opposite the inlet orifices 20, to 20., of the body 2.
- a mechanical clearance 21 is provided between the plug
- a seal 41 is provided between the plug 1 and the body 2 to seal between the outlet orifice 20a and the inlet ports 20 1 to 20 4 .
- a motor 3, for example of the asynchronous type is fixed on the cover 2a of the body 2. In order to have a satisfactory speed of rotation, it may be necessary to associate a speed reducer with the motor 3.
- the motor shaft 30 3 is integral with the plug 1 and is provided to move the plug 1 in rotation inside the body 2.
- a seal 42 is provided between the shaft 30 and the cover 2a.
- the plug 1 could be driven in rotation by the compressor motor, for example by means of a speed reducer to adjust the rotation speeds. It could also be driven by a turbine operating by the pressure difference between the suction circuit and the discharge circuit.
- the inputs 20, to 20 4 of the body 2 are respectively connected to external conduits 200 1 to 200 4 .
- Said external conduits 200, 200 4 are connected to the four separate points of the installation where pressure measurements are to be made.
- a single pressure sensor 4 is connected by a conduit 40, to said outlet orifice 20a of the body 2.
- the pressure sensor 4 has its output which is connected to an input of a control unit 5, for example with a microprocessor.
- a contactor 6 is mounted, on the one hand, on the fixed part of the motor 3 and, on the other hand, on the shaft 30 of the motor 3 which is in rotation. From these two fixing points, the contactor 6 delivers, at each turn of the plug 1, a tracking pulse to the control unit 5 to which it is connected.
- Said contactor 6 is JQ constituted by any means known per se which fulfills this function.
- the control unit 5 is provided for processing the signals from the sensor 4 and the contactor 6 respectively and for rendering the result of this processing in the form of a display, a recording, a regulation action, etc. .
- a display 7 a display 7.
- the motor 3 drives the valve 1 in rotation inside the body 2.
- the end 11b sweeps the inner wall of the body 2 to 2 Q level of inlet ports 20, 20 4.
- the pressure to be measured is transmitted, via the corresponding external conduit 200, to 200 4 , via the conduit 11, via the groove 10 and via the conduit 40, up to the pressure sensor 4.
- the sensor 4 measures the pressure in a very short time. It then transmits to unit 5 the signal whose value is representative of the pressure measured. In the case of the system shown, this value is displayed on the display 7.
- the contactor 6 delivers a tracking pulse Q to the unit 5.
- the unit 5 defines a number of windows equal to the number of inlet orifices 20, - during which it will read the signal delivered by the pressure sensor 4.
- the time windows are determined from the speed of rotation of the bushel 1, the positions relative inlet ports 20, to 20 4 and contactor 6 so that a window corresponds to the communication of the end 11b of the channel 11 with an inlet port 20, 20 4 . They are also determined by taking into account the time necessary to balance the pressures during the measurement.
- the signal delivered by the sensor 4 is a periodic step signal, each step representing the pressure present on an input. It will be understood that it is then possible to carry out the above-mentioned location by detecting one of the fronts between two levels. To this end, it is advantageous to consider a significant front in amplitude, for example the front which separates two rungs respectively representative of a high pressure and a low pressure.
- the sealing means shown in FIG. 1 consist of a pad 13 of flexible plastic material placed in a housing 12 provided around the end 11b of the conduit 11.
- Springs 14 are provided in blind holes in the bottom of the housing 12 to exert a resulting axial force on the patch 13, so that the front face of the latter is in contact with the internal wall of the body 2.
- the patch 13 By its contact on the internal wall of the body 2, the patch 13 seals between the end 11b of the conduit 11 and each inlet orifice 20, at 20 4 .
- these sealing means are static and do not contribute to the isolation of the inlet orifices when these are not in communication with the outlet orifice.
- such sealing means have drawbacks that the present invention proposes to solve.
- these means are provided for closing each inlet orifice 20, at 20 4 when it is not in communication with the outlet orifice 20a.
- the plug 1 which actuates, for example by means of a cam, said sealing means in order to allow the communication of an inlet orifice 20, to 20 4 with the orifice output 20a.
- This embodiment incorporates the main elements of the device shown in FIG. 1, which then bear the same references.
- the sealing means initially formed by the pellets 13 of flexible material now consist of a drawer system placed in front of each inlet orifice.
- An inlet orifice 20 j (i "1 to 4) will therefore be either closed or put in communication with the end 11b of the valve duct 1.
- the body 2 has, on its side wall 2c, an inner annular portion 2d in which are pierced alé ⁇ ages 22 22 4 axes parallel to the axis of the plug 1.
- the bores 22, to 22 4 are provided to respectively receive drawers 23 ,, 23 2 , 233 and 23 4 provided with seals (not shown).
- the inlet openings 20, 20 4 respectively open into the bores 22, 22 4 .
- Each drawer 23, - is of generally cylindrical shape and consists of a head 23 ⁇ a and a rod 23, -b.
- the right drawer 23 has its head 23, which closes the inlet orifice 20 ,. It is then said to be in the rest position.
- the head 233a of the left drawer 233 discovers the inlet orifice 20 3 . It is therefore said to be in the open position.
- Means on the plug 1 are provided for sliding, in their bores 22, - respective, each of the drawers 23, - from its rest position to its open position when the plug 1 turned.
- These means consist of a groove 15 which is intended to accommodate the annular part 2d of the body 2.
- a cam 16 and a cam follower 17 are formed respectively, complementary to the cam 16.
- the distance which separates the two side walls 15a and 15b from the groove 15 is equal, apart from play, to the length between the end of the head 23; a and the end of the rod 23 f b of each drawer 23 ;.
- the distance between the top of the cam 16 and the bottom of the cam 17 is, apart from the clearance, the length between the end of the head 23, a and the end of the rod 23 ; b of each drawer 23 ;.
- the plug 1 can be made in two separate assembled parts.
- each bore 22 at a level offset from the inlet orifice 20, -, opens a first end of a channel 18 directed towards the axis of the plug 1.
- the second end of the channel 18 opens facing the plug 1 at the same level as the end 11b of channel 11 of plug 1.
- the cam 16 When the plug 1 rotates, the cam 16 successively pushes the rod 23; b of each drawer 23; while the head 23, -a enters the cam follower 17 located opposite the cam 16. This results in the sliding of the drawer 23; from its rest position to its open position. In this latter position, the inlet orifice 20; is in communication with the channel 18 and the latter with the end 11b of the channel 11.
- the cam follower 17 pushes the slide 23; which then passes from its open position to its closed position. There, the inlet 20; is closed and insulated, which ensures a good seal of this entry.
- cam follower 17 provides a function of returning the drawer 23 to 23 4 from its open position to its rest position.
- the end 11b of the channel 11 is located, on the plug 1, opposite the cam 16 and the cam follower 17.
- bore 22 is blind and houses a drawer 23 ;.
- a spring 24 is provided; leaning on the head 23; a of the drawer 23 ;.
- the plug 1 only has the cam 16 (it does not have a cam follower 17) which, by pushing the rod 23, -b of the drawer 23;, releases the inlet orifice 20 ;.
- the spring 24 serves as a means of returning the drawer 23; from its open position to its rest position.
- each inlet port 20, to 20 4 of the body 2 is provided with a flat valve 52, the opposite faces of which can rest respectively on seats 53a and 53b opposite one another.
- the latter are, for example, formed by the lateral faces of an annular groove formed in a cylindrical part 53.
- the part 53 is mounted axially in the orifice 20, at 20 4 corresponding.
- the part 53 is provided, on the plug side 1, with an opening 53c and, on the other side, with an opening 53d opening out inside the groove forming the seats 53a and 53b.
- a rod 54 is fixed to the face of the valve 52 which is located opposite the plug 1. The rod 54 leaves the part 53 through the opening 53c and extends slightly outside the body 2.
- a cam 51 is provided on the plug 1, on an edge of the end 11b of the conduit 11.
- Said valves 52 also seal the inlet orifices 20, 20 to 4 between them, since each valve 52 is only open at the time of passage of the cam 51 and for a period depending on the length of the cam 51.
- FIG. 4 Another embodiment of the plug 1 and of the body 2.
- said outlet orifice 20a to which the pressure sensor 4 is connected is located on the bottom 2b of the body 2 and along the axis of said body 2.
- a part 11 'of the conduit 11 follows the axis of the plug 1 to end, in its lower part by its end 11a.
- said conduit 11 extends radially so as to join the end 11b.
- the plug 1 is extended axially by a linked pin in the outlet orifice 20a and a seal 43 is provided between the linked pin and the body 2. Note the presence of the seal 42 provided for sealing.
- sealing means between the inlet orifices 20; and the plug 1 are shown in FIG. 4 by rectangles referenced 23.53. These sealing means have the same structure as those described with reference to the Fige. 2a, 2b and 3a, 3b.
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Measuring Fluid Pressure (AREA)
Abstract
Description
Claims
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU31686/95A AU3168695A (en) | 1994-08-05 | 1995-08-04 | Device for measuring pressure at different measuring locations |
EP95927763A EP0727043A1 (fr) | 1994-08-05 | 1995-08-04 | Dispositif de mesure de la pression en differents points de mesure |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
FR94/09933 | 1994-08-05 | ||
FR9409933A FR2723443B1 (fr) | 1994-08-05 | 1994-08-05 | Dispositif de mesure de la pression en differents points de mesure |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1996004538A1 true WO1996004538A1 (fr) | 1996-02-15 |
Family
ID=9466253
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/FR1995/001058 WO1996004538A1 (fr) | 1994-08-05 | 1995-08-04 | Dispositif de mesure de la pression en differents points de mesure |
Country Status (4)
Country | Link |
---|---|
EP (1) | EP0727043A1 (fr) |
AU (1) | AU3168695A (fr) |
FR (1) | FR2723443B1 (fr) |
WO (1) | WO1996004538A1 (fr) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102014205923B4 (de) * | 2014-03-31 | 2023-06-07 | Aktiebolaget Skf | Modul zum Erfassen einer physikalischen Größe eines gasförmigen Mediums |
Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3008490A (en) * | 1958-10-17 | 1961-11-14 | United Aircraft Corp | Pressure selector switch |
DE2544518A1 (de) * | 1975-10-04 | 1977-04-14 | Karl Hehl | Manometer-wahlschalter |
US4072049A (en) * | 1977-04-15 | 1978-02-07 | The United States Of America As Represented By The Secretary Of The Army | Apparatus for measuring surface pressures on spinning aerodynamic bodies |
FR2393963A1 (fr) * | 1977-06-07 | 1979-01-05 | Hehl Karl | Dispositif de raccordement successif d'un manometre avec divers points de mesure de pression |
DE2816321A1 (de) * | 1978-04-14 | 1979-10-31 | Nikolai Vasilievitsch Rudenko | Gasdruck-messtellen-umschalter |
DE3119858A1 (de) * | 1981-05-19 | 1982-12-16 | Flutec Fluidtechnische Geräte GmbH, 6603 Sulzbach | "umschaltventil zum verbinden jeweils einer von mehreren messstellen mit einem manometer" |
-
1994
- 1994-08-05 FR FR9409933A patent/FR2723443B1/fr not_active Expired - Fee Related
-
1995
- 1995-08-04 AU AU31686/95A patent/AU3168695A/en not_active Abandoned
- 1995-08-04 WO PCT/FR1995/001058 patent/WO1996004538A1/fr not_active Application Discontinuation
- 1995-08-04 EP EP95927763A patent/EP0727043A1/fr not_active Withdrawn
Patent Citations (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3008490A (en) * | 1958-10-17 | 1961-11-14 | United Aircraft Corp | Pressure selector switch |
DE2544518A1 (de) * | 1975-10-04 | 1977-04-14 | Karl Hehl | Manometer-wahlschalter |
US4072049A (en) * | 1977-04-15 | 1978-02-07 | The United States Of America As Represented By The Secretary Of The Army | Apparatus for measuring surface pressures on spinning aerodynamic bodies |
FR2393963A1 (fr) * | 1977-06-07 | 1979-01-05 | Hehl Karl | Dispositif de raccordement successif d'un manometre avec divers points de mesure de pression |
DE2816321A1 (de) * | 1978-04-14 | 1979-10-31 | Nikolai Vasilievitsch Rudenko | Gasdruck-messtellen-umschalter |
DE3119858A1 (de) * | 1981-05-19 | 1982-12-16 | Flutec Fluidtechnische Geräte GmbH, 6603 Sulzbach | "umschaltventil zum verbinden jeweils einer von mehreren messstellen mit einem manometer" |
Also Published As
Publication number | Publication date |
---|---|
AU3168695A (en) | 1996-03-04 |
FR2723443A1 (fr) | 1996-02-09 |
EP0727043A1 (fr) | 1996-08-21 |
FR2723443B1 (fr) | 1996-10-25 |
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