MXPA99010504A - Shooter device of differential pressure - Google Patents

Abstract

Se presenta un dispositivo activador o disparador de presión diferencial que tiene un alojamiento, el cual tiene cámaras internas adyacentes primera y segunda con sus respectivas entradas de presión. Un diafragma que responde a la presión diferencial se extiende entre las cámaras internas. Un disco de fierro estácolocado en el interior de la primer cámara interna y estáunido al diafragma, de modo que, como resultado de la deflexión del diafragma, se mueve a lo largo de un curso de desplazamiento predeterminado. En el exterior del alojamiento y a lo largo de la primera cámara interna estámontada la unidad activadora o disparadora. La unidad disparadora tiene un actuador y un dispositivo interruptor que responde al movimiento del actuador para producir la acción disparadora. Un imán estáunido al actuador en un arreglo magnético móvil interactivo con el disco de fierro, de modo que un desplazamiento del disco de fierro, que resulta de la deflexión del diafragma, provoca el correspondiente desplazamiento del imán, impulsando de esta manera al actuador que opera o hace funcionar al dispositivo interruptor.

Description

DIFFERENTIAL PRESSURE TRIGGER DEVICE FIELD OF THE INVENTION The present invention relates to differential pressure detectors and, more particularly, to a differential pressure activator or trigger device, devoid of a transverse actuator valve.

BACKGROUND OF THE INVENTION Differential pressure detectors typically have a poppet valve that passes through the wall of the detector housing to drive an external switch device. This configuration is necessarily open to pressure leaks and produces inaccurate readings and / or results, especially in high pressure applications, such as, for example, in ventilation ducts. In the art, the Patent of the United States No. 5,024,294 (to Van Fossen et al.), Which shows a differential pressure transducer having a diaphragm subjected on each side at different pressures. A rod is attached to the diaphragm, the rod supports a magnet that moves inside the transducer housing as a function of the measured pressure differential. The rod is suspended at one end by a P1667 / 99MX tension spring, the opposite end of the rod is attached to the diaphragm. The displacement of the rod, caused by the bending of the diaphragm is measured by means of an effect detector in the transducer housing. U.S. Patent No. 3,967,504 (from A eley) is also known in the art, which shows a differential pressure detector having a spring subjected to compression when the pressure in a high pressure line exceeds the pressure in a low pressure line. U.S. Patent No. 3,831,588 (to Rindner) is also known in the art, which shows a pressure measuring device that produces an electrical signal proportional to the pressure. The device is housed in a chamber having a flexible diaphragm to transmit the external pressure to the detector. U.S. Patent No. 5,817,943 (Welles, II et al.) Is also known in the art, which shows a pressure sensor having a structure to generate a magnetic force to balance the forces on opposite sides of the body. a flexible diaphragm centered inside a pressure chamber in which a pressurized fluid is introduced into one side of the diaphragm. U.S. Patent No. 5,303,595 (to Shoj et al) is also known in the art.

P1667 / 99MX al. ), which shows a pressure detector based on the magnetostriction effect. U.S. Patent No. 5,355,714 (Suzuki et al.) Is also known in the art which shows a pressure sensor using a magnetic film that responds to pressure to vary the inductance of a coil. The diaphragm is arranged or arranged to move, depending on the pressure differential, thereby changing the inductance of the coil. The techniques are also known in the art United States Patent Nos. 3,575,054 (of Glista); 3,590,638 (of Anastasia); 4,336,567 (of Anastasia); 4,373,385 (Boutteville et al.); 4,453,412 (from Nakane); 4,475,405 (from Corpron et al.); 4,487,074 (from Herden); 4,671,116 (from Glennon et al.); 4,716,492 (de Charboneau et al.); 4,876,893 (from Kato et al.); ,068,503 (Sladky); 5,219,041 (de Greve); 5,315,878 (from Birenheide); 5,437,241 (de Rosenberg et al.); ,760,310 (Rud, Jr. Et al.); 5,874,680 (Moore); ,880,373 (by Barton); 5,889,212 (from Guthrie et al.); and 5,908,990 (Cummings), which show all types of pressure detectors illustrating the state of the art.

SUMMARY OF THE INVENTION An object of the invention is to provide a pressure activating or triggering device P1667 / 99MX differential, devoid of an actuator lift that crosses or passes through the wall of the device housing. A subsidiary object of the invention is to provide a differential pressure activating or triggering device that is simple in construction and, in this way, of very competitive cost, and that is still very reliable and efficient. Another subsidiary object of the invention is to provide a differential pressure activator or trigger device that provides accurate readings and drive functions even if the device is subjected to high positive or negative pressures. In accordance with the present invention, there is provided a differential pressure activating or triggering device, comprising a housing having first and second adjacent internal chambers and first and second pressure inputs that respectively communicate with the first and second internal chambers. A pressurized member extends between the internal chambers, the flexing member responds to the differential pressure between the internal chambers. A first magnetic chamber is placed inside the first internal chamber and is attached to the flexing member, so that the flexing or deflection of the flexing member moves inside the first internal chamber P16S7 / 99MX to the first magnetic member along a predetermined displacement course. An activating or triggering unit is mounted outside the housing along the first internal chamber, the trigger unit includes an actuator and a switch device that responds to the movement of the actuator to produce a driving action. A second magnetic member is attached to the actuator in an interactive mobile magnetic arrangement with the first magnetic member, so that the displacement of the first magnetic member along the displacement course, resulting from the flexing of the flexing member, causes the corresponding displacement of the second magnetic chamber, thus driving the actuator operating the switch device.

BRIEF DESCRIPTION OF THE DRAWINGS The detailed description of preferred embodiments will be provided hereinafter, with reference to the following drawings, in which like numbers refer to like elements: Figure 1 is a schematic cross-sectional view of a differential pressure activator or trigger device, in accordance with the invention; and Figures 2, 3 and 4 are respectively P16S7 / 99MX top views, in lateral and rear elevation of the differential pressure activator or trigger device shown in Figure 1.

DETAILED DESCRIPTION OF THE PREFERRED MODALITIES Referring to Figures 1-4, a differential pressure triggering device according to the invention is shown. The device has a housing 2 that forms first and second adjacent internal chambers, 4 and 6. The first and second pressure inputs, 8 and 10, respectively communicate with the first and second internal chambers 4 and 6. Normally but not in shape restrictive, the first pressure inlet 8 can be used to receive a fluid whose pressure level can trigger an action, for example, the dynamic pressure in a duct (not shown in the Figures), while the second pressure inlet it can be used to receive a fluid having a static pressure, for example, for reference purposes. A pressure-bending member, for example, in the form of a membrane or flexible diaphragm 12 extends between the internal chambers 4 and 6. The membrane 12 responds to a differential pressure between the internal chambers 4 and 6, so that it flexes towards left or right from its initial resting position, depending on whether the pressure in the first chamber 4 is greater or lesser P1S67 / 99MX that the pressure in the second chamber 6. A first magnetic member, for example, in the form of a metallic disk (for example, of iron) 14 is placed inside the first internal chamber and is attached to the membrane 12, for example, by means of a rod 16, so that the deflection of the membrane 12 displaces the disk 14 along the predetermined displacement course inside the first internal chamber 4. In the illustrated embodiment, the displacement of the disk 14 continues simply the deflection of the membrane 12. Other arrangements can be used that cause a displacement of the disk 14, in response to a deflection of the membrane 12. A trigger unit 18 is mounted on the outside of the housing 2, along the first chamber internal 4. The trigger unit 18 has an actuator, for example, in the form of a pivotably mounted arm 20 having an upper end whose right side can at least partially close an aber 24 of a tubular insert 22, when the upper end of the arm 20"rotates or pivots in a clockwise direction. The closure of the opening 24 can be used to block the passage of a fluid in the tubular insert 22, thereby producing a firing action. The tubular insert 22 thus forms a pneumatic switch which responds to the movement of the P1SS7 / 99MX actuator. A contact sensitive switch or any other suitable types of switches or switch devices may be used as a replacement for the pneumatic switch formed by the insert 22. A second magnetic member, for example, in the form of a magnet 26 is attached to the lower end of the arm 20 in an interactive mobile magnetic arrangement with the disk 14, so that a displacement of the disk 14 along the displacement course, resulting from the deflection of the membrane 12, causes the corresponding displacement of the magnet 26, thus driving the arm 20 of the actuator operating or operating the switch device formed by the insert 22. In this way, during the operation, the magnet 26 will follow any displacement of the disk 14, as a result of the deflection to the right or to the left of the membrane 12, caused by the pressure difference between the inlets 8 and 10. This arrangement of magnet 26 and disk 14 communicates the movement of the membrane 12 in the interior of the housing 2 to the external switch device to the housing 2 without any element passing through the housing 2. The housing 2 can be formed of complementary portions first and second, 28 and 30, cup-shaped, united in a safe way and that P16S7 / 99MX respectively define the first and second internal chambers 4 and 6. The first cup-shaped portion 28 can have a longitudinal central extension 32 of reduced diameter projecting away from the membrane 12. The rod 16 supporting the disk 16 it has an end connected to the membrane 12 itself projecting from the membrane 12 and extending longitudinally in the longitudinal central extension 32. The disk 14 is mounted on the rod 16 and is placed inside the longitudinal extension 32 of the first portion 28 with cup shape. The metallic disc 14 preferably has a diameter slightly smaller than the internal diameter of the extension 32, so that, for the best magnetic interaction, it has a portion as close as possible to the magnet 26. The circular shape of the disc 14 it makes it operate regardless of its angular position around the rod 16. The shapes of the disk 14 and the inner section of the extension 32 can adopt other suitable configurations, for example, the rectangular one. The trigger unit 18 is mounted on the longitudinal extension 32 of the first cup-shaped portion 28. In the illustrated embodiment and, as evident in Figures 1-4, the trigger unit 18 is mounted on or near the upper portion of the housing 2, so that the arm 20 rotates or pivots.

P16S7 / 99MX like a pendulum. The arm 20 is pivotally mounted about a pivot axis 34 which extends transverse to the course of the displacement of the disc 14. The insert 22 is positioned on one side of the upper end of the arm 20 along the pivotal course of the arm. same. The trigger unit 18 may have a housing 36. The insert 22 extends through the housing 36, with the opening 24 close to the upper end of the arm 20, so that the opening is blocked, at least partially, by the upper end of the arm. arm 20 when the upper end reaches a predetermined position along the pivotal course, as a result of the pivoting action of the arm 20. The arm 20 can be pivotally supported by a bracket or support 54 slidably mounted in the housing 36 and that can be moved towards and away from the opening 24 of the insert 22 secured to the housing 36. Through the housing 36 an adjustment screw 56 having an end attached to the bracket or support 54 is screwed in, so that the support 54 can be moved by subjecting the adjusting screw 56 to rotation. This arrangement forms a device for adjusting the degree of movement of the arm 20, required to cause r that the switch device produces the trigger action. Other configurations can be used P1SS7 / 99MX, for example, a sliding unit that moves the tubular insert 22 in approach or away from the arm 20 instead of the arm 20 with respect to the tubular insert 22. The rod 16 may be provided with a central hub of support 38 slidably mounted inside the extension 32. The rod 16 can also be provided with a pair of longitudinal springs 40 and 42, between which the bushing 38 is inserted, to push it in a longitudinal position centered along of the rod 16. If the first and second pressure inlets 8 and 10 are positioned opposite each other with the bushing 38 extending between them, as illustrated, then the bushing 38 preferably has at least one through hole 44, in the direction of the width, which provides the communication between the first pressure inlet 8 and the membrane 12 for the proper operation of the device. The rod 16 may be metallic and may have a longitudinal threaded portion along which the disc 14 is placed and secured in place by a pair of opposing screws 46 and 48, screwed into the threaded portion and pressing the opposite sides of the disk 14. The membrane 12 can have a central iron washer 58 with a nut 60 welded in the middle to receive the P1SS7 / 99MX threaded end of rod 16. Cup-shaped portions 28 and 30 may have abutting peripheral flanges 50 and 52. Membrane 12 may be rubberized and may have a central portion and a peripheral portion thinner than the portion central. The peripheral portion has a circumferentially pressed edge between the peripheral flanges 50 and 52 of the cup-shaped portions 28 and 30 for clamping the membrane 12, while allowing deflection or transverse displacement in response to a differential pressure. The peripheral flanges 50 and 52 may have the respective holes 62 circumferentially distributed for the passage of securing nuts, as best shown in Figure 4. Normally, the membrane 12 completely separates the two internal chambers 4 and 6. But, if it is necessary, it can only partially separate the two internal chambers 4 and 6 from each other, provided that the differential pressure remains sufficient to bend the membrane 12 for a reading. The disk 14 and the magnet 26 can be exchanged with each other. Two magnets operating by attraction or repulsion can also be used, provided that the arrangement of the device is adapted for this purpose.

P16e7 / 99MX If needed, pressure reading can be provided in the center of chambers 4 and 6, by means of a device such as a Pitot tube (not shown in the Figures). While the embodiments of this invention have been illustrated in the accompanying drawings and have been described above, it will be apparent to those skilled in the art that changes and modifications can be made herein without departing from the essence of this invention. All of these modifications or variations are considered to be within the scope of the invention, as defined by the claims appended hereto.

P1667 / 99MX

Claims (13)

1. NOVELTY OF THE INVENTION Having described the present invention, it is considered as a novelty and, therefore, the content of the following CLAIMS is claimed as property; A differential pressure activating or triggering device, comprising: a housing having adjacent, first and second internal chambers, and first and second pressure inputs, communicating, respectively, with the first and second internal chambers; a pressure-bending member extending between the internal chambers, the flexing member responds to a differential pressure between the internal chambers; a first magnetic member placed inside the first internal chamber and joined to the flexing member, so that the deflection of the flexing member displaces the first magnetic member along a predetermined displacement course, inside the first internal chamber; an activating or triggering unit mounted on the outside of the housing along the first internal chamber, the activating or triggering unit includes an actuator and a switch means that responds to the movement of the actuator to produce the triggering action; Y P1S £ 7 / 99MX a second magnetic member attached to the actuator in a moving magnetic array interactive with the first magnetic means, so that the displacement of the first magnetic member along the course of displacement, resulting from the deflection of the flexing member, causes a corresponding displacement of the second magnetic member, thus driving the actuator that operates or operates the switch means. The differential pressure triggering device according to claim 1, wherein: the housing comprises: first and second cup-shaped complementary portions defining, respectively, the first and second internal chambers, the first cup-shaped portion has a longitudinal central extension of reduced diameter projecting away from the flexing member; and a securing means for securing the housing portions by securing; the first magnetic member is attached to the flexing member by means of a rod connected to the flexing member and projecting therefrom and extending longitudinally in the longitudinal central extension, the first magnetic member is mounted on the rod and placed inside of the longitudinal extension of the first cup-shaped portion; Y P1667 / 99MX the trigger unit is mounted on the longitudinal extension of the first cup-shaped portion. The differential pressure triggering device according to claim 2, wherein: the triggering unit is mounted on or near the upper portion of the housing; the actuator comprises an arm pivotally mounted about a pivot axis extending transversely to the course of travel of the first magnetic member, the arm having a pivoting lower end provided on the second magnetic member and an opposite upper pivoting end; and the switch means is positioned on one side of the upper end along the pivotal course thereof. The differential pressure triggering device according to claim 3, wherein: the triggering unit comprises a housing; and the switch means comprises a tubular element extending through the housing of the trigger unit, the tubular element has an opening close to the upper end of the arm, so that the opening is blocked, at least partially, by the upper end of the arm. arm when the top end reaches a position P1667 / 99MX predetermined along the pivoting course, as a result of the pivoting action of the arm. The differential pressure triggering device according to claim 2, wherein the rod is provided with a central support bushing slidably mounted within the extension. The differential pressure triggering device according to claim 5, wherein the rod is provided with a pair of longitudinal springs between which the bushing is inserted. The differential pressure triggering device according to claim 5, wherein: the first and second pressure inlets are positioned opposite each other, wherein the bushing extends between them; and the bushing has at least one through hole, in the direction of the width, which provides the communication between the first pressure inlet and the flexing member. The differential pressure triggering device according to claim 2, wherein the rod has a threaded longitudinal portion, the first magnetic element is positioned along the threaded portion and secured in position with a pair of opposite screws mounted on the threaded portion and pressing or pressing opposite sides of the first magnetic element. P16S7 / 99MX 9. The differential pressure triggering device according to claim 2, wherein: the cup-shaped portions have abutting peripheral flanges; and the flexing member comprises a rubber membrane having a central portion and a peripheral portion thinner than the central portion, the peripheral portion being circumferentially pressed between the peripheral flanges of the cup-shaped portions. 10. The differential pressure triggering device according to claim 9, wherein the peripheral flanges of the cup-shaped portions have the respective holes for the passage of securing nuts distributed circumferentially. The differential pressure triggering device according to claim 1, wherein the triggering unit comprises means for adjusting the degree of movement of the actuator, required to cause the switch means to produce the triggering action. The differential pressure triggering device according to claim 4, wherein the triggering unit comprises: a support slidably mounted in the housing of the trigger unit and movable towards and away from the opening of the trigger unit. P1S67 / 99MX tubular element, the support supports the actuator arm; and an adjusting screw mounted screwed through the housing of the trigger unit and having an end attached to the support, so that the support can be moved by screwing the adjusting screw. The differential pressure triggering device according to claim 2, wherein: the first magnetic element comprises a metal disk having a diameter slightly smaller than the internal diameter of the extension; and the second magnetic element comprises a magnet secured to the actuator. P1667 / 99MX