Differential pressure transmitter using magnetic force transmission

Abstract

The application discloses a differential pressure signaler utilizing magnetic force conduction and belongs to the technical field of sensors, and solves the technical problems of short mechanical life and low output precision of the differential pressure signaler in the prior art. The differential pressure signaler comprises a shell, a signal transmission assembly and a sensor assembly; the upper part of the shell is a signal cavity, the signal cavity is used for accommodating the signal transmission assembly, the lower part of the shell is an oil cavity, and the oil cavity is used for accommodating the sensor assembly; the signal transmission assembly comprises a socket, a sliding block assembly, a stylus assembly connected with the sliding block assembly and a wire assembly connected with the socket; and the sensor assembly comprises a magnet core, and a force is generated between the magnet core and the sliding block assembly, and the force is a non-contact magnetic force. The differential pressure signaler utilizing magnetic force conduction can be better used for differential pressure sensing work in special environments.

Description

Technical Field

[0001] This invention relates to the field of sensor technology, and more specifically to a differential pressure signaler that utilizes magnetic force transmission. Background Technology

[0002] Existing differential pressure signalers are limited by traditional structures and signal transmission methods. They use displacement as the physical quantity for transmitting information, and the isolation between the pressure chamber and the electrical chamber often adopts dynamic sealing forms such as bellows and diaphragms, transmitting the differential pressure signal through physical displacement.

[0003] Because bellows and diaphragms generate significant strain when transmitting displacement, the stress is often substantial. This limits the lifespan and reliability of the differential pressure signal receiver / sensor assembly. Furthermore, the strain generated by the bellows and shaft seal diaphragm under pressure affects the accuracy of displacement transmission, increasing zero-point drift under large system pressure conditions and impacting product output precision. Generally, spring-plate assemblies or microswitches are used as signal conversion components to convert displacement into electrical signals. However, because significant deformation is required to ensure stable operation, their mechanical lifespan is typically short. Summary of the Invention

[0004] The purpose of this invention is to provide a differential pressure signal device that utilizes magnetic force transmission to solve the technical problems of short mechanical life and low output accuracy of existing differential pressure signal devices.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] The present invention provides a differential pressure signal device using magnetic force transmission, comprising a housing, a signal transmission component, and a sensor component; the upper part of the housing is a signal cavity for accommodating the signal transmission component, and the lower part of the housing is an oil cavity for accommodating the sensor component.

[0007] The signal transmission component includes a socket, a slider assembly, a stylus assembly connected to the slider assembly, and a wire assembly connected to the socket;

[0008] The sensor assembly includes a magnetic core, and a force is generated between the magnetic core and the slider assembly. The force is a non-contact magnetic force.

[0009] Optionally or preferably, the sensor assembly further includes a sensor support, the bottom of which is provided with an adjusting screw, one end of which is connected to a spring, the other end of which is connected to a piston core, and a magnet core is connected to the upper part of the piston core.

[0010] An isolation member is provided outside the piston core. A high-pressure chamber is formed between the piston core and the sensor support and on the upper side of the isolation member. A low-pressure chamber is formed between the piston core and the sensor support and on the lower side of the isolation member. The high-pressure chamber and the low-pressure chamber are respectively connected to the outside through the high-pressure chamber inlet and the low-pressure chamber inlet. The high-pressure chamber inlet is located on the side wall of the sensor support, and the low-pressure chamber inlet is located at the bottom of the sensor support.

[0011] Optionally or preferably, the isolation element includes a plurality of sealing rings and a plurality of aluminum rings disposed on the outer wall of the piston core, wherein the plurality of sealing rings and the plurality of aluminum rings are arranged alternately;

[0012] The sealing ring is clearance-fitted with the piston core, and the sealing ring is interference-fitted with the sensor support; the aluminum ring is clearance-fitted with the piston core, and the aluminum ring is clearance-fitted with the sensor support.

[0013] Optionally or preferably, the slider assembly includes a mechanism frame connected to the inner wall of the signal cavity by a screw, the mechanism frame including a U-shaped part and support plates respectively connected to both sides of the U-shaped part; a shaft passes through the U-shaped part, a magnetic slider is connected to one or both ends of the shaft, and a stylus assembly is connected to the middle of the shaft.

[0014] Optionally or preferably, the slider assembly further includes one or more baffles, the baffles being fixed to the support plate by screw two, and an adjusting washer being provided between the baffles and the screw two.

[0015] Optionally or preferably, the stylus assembly includes an insulating seat disposed in the middle of the shaft, and a stylus is connected to the insulating seat.

[0016] Optionally or preferably, the wire assembly includes an insulating base two connected to the inner wall of the signal cavity, and wire one and wire two respectively disposed on the insulating base two.

[0017] Based on the above technical solution, the present invention can produce at least the following technical effects:

[0018] This invention provides a differential pressure signal transducer that utilizes magnetic force transmission. It converts changes in magnetic force into electrical signals via a wire assembly and a socket through a non-contact magnetic force between a magnetic core and a magnetic slider. The magnetic slider drives a stylus to rotate. Using magnetic force as an information carrier, it senses and measures parameters within the oil chamber. It exhibits excellent resistance to pressure and differential pressure overloads, enabling its use in harsh environments such as flammable and explosive conditions. Furthermore, no dynamic sealing structure is required between the signal chamber and the oil chamber, resulting in advantages such as simple structure, small size, light weight, and high reliability. Attached Figure Description

[0019] Figure 1 This is a front cross-sectional view of the differential pressure signal device utilizing magnetic force transmission according to the present invention;

[0020] Figure 2 This is a front cross-sectional view of the sensor assembly in the differential pressure signal transmitter utilizing magnetic force transmission of the present invention.

[0021] Figure 3 This is a front view of the slider assembly in the differential pressure signal device utilizing magnetic force transmission of the present invention;

[0022] Figure 4 This is a side view of the slider assembly in the differential pressure signaler utilizing magnetic force transmission of the present invention;

[0023] Figure 5 This is a top view of the slider assembly in the differential pressure signal device utilizing magnetic force transmission of the present invention;

[0024] Figure 6 This is a top view of the stylus assembly in the differential pressure signal device utilizing magnetic force transmission of the present invention;

[0025] Figure 7 This is a side view of the stylus assembly in the differential pressure signaler utilizing magnetic force transmission of the present invention;

[0026] Figure 8 This is a top view of the wire assembly in the differential pressure signal device utilizing magnetic force transmission according to the present invention.

[0027] In the diagram: 1. Sensor assembly; 2. Screw 1; 3. Contact pin assembly; 4. Slider assembly; 5. Housing; 6. Socket; 7. Adjusting screw; 8. Spring; 9. High-pressure chamber inlet; 10. Sensor support; 11. Magnet core; 12. Piston core; 13. Sealing ring; 14. Aluminum ring; 15. Low-pressure chamber inlet; 16. High-pressure chamber; 17. Low-pressure chamber; 18. Magnet slider; 19. Adjusting washer; 20. Screw 2; 21. Baffle; 22. Mechanism frame; 221. U-shaped part; 222. Support plate; 23. Shaft; 24. Insulating seat 1; 25. Contact pin; 26. Wire assembly; 27. Insulating seat 2; 28. Wire 1; 29. ​​Wire 2. Detailed Implementation

[0028] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0029]

Example

[0030] Please see Figure 1A differential pressure signal device utilizing magnetic force transmission includes a housing 5, a signal transmission component, and a sensor component 1. The upper part of the housing 5 is a signal cavity for accommodating the signal transmission component, and the lower part of the housing 5 is an oil cavity for accommodating the sensor component 1. The sensor component 1 senses and measures the parameters to be measured in the oil cavity, and the signal transmission component converts the magnetic force change into an electrical signal, which is then transmitted to an external detection system, which issues an alarm signal.

[0031] Specifically, the signal transmission components are provided in a socket 6 at one end of the housing 5, a slider assembly 4 at the other end of the housing 5, a pin assembly 3 connected to the slider assembly 4, and a wire assembly 26 connected to the socket 6.

[0032] Please see Figure 2 In this embodiment, a sensor support 10 is provided at the lower part of the housing 5. An oil cavity is formed inside the sensor support 10, and the aforementioned sensor assembly 1 is disposed inside the oil cavity. The sensor assembly 1 includes a magnet core 11 disposed at the upper part of the sensor support 10. A thin wall is formed between the magnet core 11 and the aforementioned signal transmission component. A piston core 12 is disposed in the middle of the sensor support 10. A spring 8 is connected to the lower end of the piston core 12. An adjusting screw 7 is connected to the lower end of the spring 8. The adjusting screw 7 is disposed at the bottom of the sensor support 10. The magnet core 11 is fixedly connected to the upper end of the piston core 12. The piston core 12 and the magnet core 11 can move relative to the sensor support 10 through the spring 8.

[0033] An isolator is provided on the outside of the piston core 12. The isolator forms a high-pressure chamber 16 between the piston core 12 and the sensor support 10, located on the upper side of the isolator, and a low-pressure chamber 17 between the piston core 12 and the sensor support 10, located on the lower side of the isolator. The high-pressure chamber 16 and the low-pressure chamber 17 are respectively connected to the outside through the high-pressure chamber inlet 9 and the low-pressure chamber inlet 15. The high-pressure chamber inlet 9 is located on the side wall of the sensor support 10, and the low-pressure chamber inlet 15 is located at the bottom of the sensor support 10.

[0034] The aforementioned isolation component includes a plurality of sealing rings 13 and a plurality of aluminum rings 14 disposed on the outer wall of the piston core 12, wherein the plurality of sealing rings 13 and the plurality of aluminum rings 14 are arranged alternately; the aforementioned alternate arrangement means that adjacent sealing rings 13 (aluminum rings 14) that are not in the first or last position are separated by an aluminum ring 14 (sealing ring 13).

[0035] Specifically, a gap is left between the maximum outer diameter of the spring 8 and the inner wall of the sensor support 10 to ensure that the spring 8 can freely contract within the sensor support 10; multiple sealing rings 13 are clearance-fitted with the piston core 12, and the sealing rings 13 are interference-fitted with the sensor support 10; multiple aluminum rings 14 are clearance-fitted with the piston core 12, and the aluminum rings 14 are clearance-fitted with the sensor support 10, wherein the last aluminum ring 14 at the lower end (larger diameter end) of the piston core 12 is riveted to the piston core 12 to ensure that the sealing rings 13 and aluminum rings 14 alternately arranged on the piston core 12 do not loosen; the magnet core 11 is interference-fitted with the piston core 12 to ensure that the magnet core 11 and the piston core 12 do not separate during the up-and-down movement of the piston core 12; the magnet core 11 is clearance-fitted with the sensor support 10 to ensure that the magnet core 11 can move freely axially within the sensor support 10.

[0036] In actual operation, high-pressure liquid enters high-pressure chamber 16 through high-pressure chamber inlet 9, and low-pressure liquid enters low-pressure chamber 17 through low-pressure chamber inlet 15. The high-pressure liquid in high-pressure chamber 16 and the low-pressure liquid in low-pressure chamber 17 are isolated by the aforementioned isolating element (specifically sealing ring 13). When the pressure difference between the liquids in high-pressure chamber 16 and low-pressure chamber 17 is greater than the elastic force of spring 8, the piston core 12 causes the magnet core 11 to move axially downward in the sensor support 10. When the pressure difference between the liquids in high-pressure chamber 16 and low-pressure chamber 17 is less than the elastic force of spring 8, the piston core 12 causes the magnet core 11 to move axially upward in the sensor support 10.

[0037] Please see Figures 3 to 5 The slider assembly 4 includes a mechanism frame 22 connected to the inner wall of the signal cavity by screw 2. In this embodiment, the mechanism frame 22 includes a U-shaped part 221 and support plates 222 connected to both sides of the U-shaped part 221. A shaft 23 is provided through the vertical plates of the U-shaped part 221. A magnetic slider 18 is connected to one end of the shaft 23, and a stylus assembly 3 is connected to the middle of the shaft 23. The stylus assembly 3 can change position as the shaft 23 rotates.

[0038] In other embodiments, the frame 22 can also be other shapes that can accommodate the shaft 23, and no specific limitation is made here; the magnetic slider 18 can be disposed at one end of the shaft 23 or at both ends of the shaft 23, and no limitation is made here.

[0039] In this embodiment, the magnet slider 18 is eccentrically arranged, and a non-contact magnetic force is generated between the magnet slider 18 and the magnet core 11. When the magnet core 11 moves upward along the sensor support 10 axis, the magnetic force between the magnet slider 18 and the magnet core 11 changes, and the magnet slider 18 rotates on the shaft 23 accordingly.

[0040] In this embodiment, the magnetic slider 18 can be made of AlNiCo and SmCo permanent magnet materials, which have good temperature characteristics and can work for a long time in high temperature (200℃) environments.

[0041] Please continue reading. Figure 5 The slider assembly 4 also includes one or more baffles 21. The number of baffles 21 can be set according to the number of magnetic sliders 18. The baffles 21 are used to limit the rotation angle of the magnetic slider 18 with the shaft 23, so that the magnetic slider 18 can drive the stylus assembly 3 to make good contact with the preset wire assembly 26. It can be understood that the specific number of baffles 21 does not affect the effect achieved. When the number of baffles 21 is 1, the limiting effect of the magnetic slider 18 can be achieved. Therefore, the specific number of baffles 21 is not limited.

[0042] In this embodiment, the baffle 21 is fixed to the support plate 222 by screw 20. An adjusting washer 19 is provided between the baffle 21 and the screw 20. The position of the baffle 21 can be adjusted by adjusting the adjusting washer 19 or the screw 20, thereby adjusting the limiting effect of the baffle 21 on the magnetic slider 18. It is understood that the adjusting washer 19 can be multiple washers stacked or have a special shape to achieve the adjustment of the baffle 21, which will not be described in detail here.

[0043] Please see Figures 6 to 7 In this embodiment, the stylus assembly 3 includes an insulating seat 24 disposed in the middle of the shaft 23, and a stylus 25 disposed on the insulating seat 24; wherein the shaft 23 and the insulating seat 24 are fixedly connected, and the stylus 25 and the insulating seat 24 are connected by an adhesive.

[0044] Please see Figure 8 In this embodiment, the wire assembly 26 includes an insulating base 27 connected to the inner wall of the signal cavity, and wires 28 and 29 respectively disposed on the insulating base 27. The insulating base 27 and the sensor support 10 are in a clearance fit, and the insulating base 27 is potted with adhesive to ensure that the wire assembly 26 and the sensor support 10 do not become loose. Wire 29 can be flexibly connected to the stylus assembly 3 via enameled wire, together forming the movable part within the signal transmission assembly.

[0045] In actual operation, high-pressure liquid enters high-pressure chamber 16 from high-pressure chamber inlet 9, and low-pressure liquid enters low-pressure chamber 17 from low-pressure chamber inlet 15. When the pressure difference between the liquid in high-pressure chamber 16 and low-pressure chamber 17 is greater than the elastic force of spring 8, piston core 12 drives magnet core 11 to move downward along the axis of sensor support 10, compressing spring 8. The repulsive force between magnet core 11 and magnet slider 18 weakens, and magnet slider 18 drives shaft 23 to rotate, thereby driving contact needle 25 to rotate. When the pressure difference between high-pressure chamber 16 and low-pressure chamber 17 reaches the specified value, contact needle 25 contacts wire 28, the circuit is connected, and the electrical signal provides an alarm signal to the external detection system through socket 6.

[0046] When the pressure difference between the liquid in the high-pressure chamber 16 and the liquid in the low-pressure chamber 17 is less than the elastic force of the spring 8, the spring 8 pushes the piston core 12 to drive the magnet core 11 to move upward along the axis of the sensor support 10. The repulsive force between the magnet core 11 and the magnet slider 18 increases. When the pressure difference between the high-pressure chamber 16 and the low-pressure chamber 17 reaches the specified value, the contact pin 25 is disconnected from the wire 28, the circuit is broken, and the electrical signal provides a low-pressure signal to the external detection system through the socket 6.

[0047] This invention provides a magnetically transmitted differential pressure signaler, which overcomes the problems of difficult manufacturing of existing isolation elements (bellows, diaphragms) and large zero-point displacement drift of sensor assemblies by utilizing the characteristic that magnetic fields can penetrate non-magnetic materials. By designing an eccentric magnet slider 18 for magnetic demodulation, the problem of unstable high-temperature performance of reed switches is solved. This structure, by eliminating dynamic isolation elements, significantly simplifies the product structure, reducing product weight by 50% and increasing the pressure / differential pressure ratio by more than 20 times. Furthermore, the product uses cobalt tungsten magnets for the magnet core 11 and the magnet slider 18, enabling it to operate stably for extended periods in environments up to 200°C.

[0048] By designing a slider assembly 4 that balances gravity and magnetic force, and by achieving magnetic demodulation through the angle change of the slider assembly 4, this demodulation method is a purely mechanical method with no electronic components, consumes no power, and has a long-term high-temperature resistance of up to 200℃, greatly improving reliability and high-temperature resistance.

[0049] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "sleeved / connected," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0050] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A differential pressure signal device utilizing magnetic force transmission, characterized in that, It includes a housing (5), a signal transmission component, and a sensor component (1); the upper part of the housing (5) is a signal cavity for accommodating the signal transmission component, and the lower part of the housing (5) is an oil cavity for accommodating the sensor component (1). The signal transmission assembly includes a socket (6), a slider assembly (4), a stylus assembly (3) connected to the slider assembly (4), and a wire assembly (26) connected to the socket (6). The sensor assembly (1) includes a magnet core (11), and a force is generated between the magnet core (11) and the slider assembly (4), the force being a non-contact magnetic force; The slider assembly (4) includes a mechanism frame (22) connected to the inner wall of the signal cavity by a screw (2). The mechanism frame (22) includes a U-shaped part (221) and support plates (222) respectively connected to both sides of the U-shaped part (221). A shaft (23) passes through the U-shaped part (221). A magnetic slider (18) is connected to one or both ends of the shaft (23). A stylus assembly (3) is connected to the middle of the shaft (23). The magnetic force changes are converted into electrical signals through the wire assembly (26) and the socket (6) by the non-contact magnetic force between the magnetic core (11) and the magnetic slider (18), and the magnetic slider (18) drives the stylus to rotate. The magnetic force is used as the information carrier to sense and measure the parameters in the oil cavity.

2. The differential pressure signal device with magnetic transmission according to claim 1, characterized in that, The sensor assembly (1) also includes a sensor support (10), with an adjusting screw (7) at the bottom of the sensor support (10). One end of a spring (8) is connected to the adjusting screw (7), and the other end of the spring (8) is connected to a piston core (12). A magnet core (11) is connected to the upper part of the piston core (12). An isolation member is provided outside the piston core (12). A high-pressure chamber (16) is formed between the piston core (12) and the sensor support (10) and on the upper side of the isolation member. A low-pressure chamber (17) is formed between the piston core (12) and the sensor support (10) and on the lower side of the isolation member. The high-pressure chamber (16) and the low-pressure chamber (17) are respectively connected to the outside through the high-pressure chamber inlet (9) and the low-pressure chamber inlet (15). The high-pressure chamber inlet (9) is provided on the side wall of the sensor support (10), and the low-pressure chamber inlet (15) is provided at the bottom of the sensor support (10).

3. The differential pressure signal device with magnetic transmission according to claim 2, characterized in that, The isolation component includes a plurality of sealing rings (13) and a plurality of aluminum rings (14) disposed on the outer wall of the piston core (12), wherein the plurality of sealing rings (13) and the plurality of aluminum rings (14) are arranged alternately; The sealing ring (13) is clearance-fitted with the piston core (12), and the sealing ring (13) is interference-fitted with the sensor support (10); the aluminum ring (14) is clearance-fitted with the piston core (12), and the aluminum ring (14) is clearance-fitted with the sensor support (10).

4. The magnetically transmitted differential pressure signaler according to claim 1, characterized in that, The slider assembly (4) also includes one or more baffles (21), which are fixed to the support plate (222) by screws (20), and an adjusting washer (19) is provided between the baffle (21) and the screws (20).

5. The magnetically transmitted differential pressure signaler according to claim 4, characterized in that, The stylus assembly (3) includes an insulating seat (24) disposed in the middle of the shaft (23), and a stylus (25) is connected to the insulating seat (24).

6. The magnetically transmitted differential pressure signaler according to claim 5, characterized in that, The wire assembly (26) includes an insulating seat two (27) connected to the inner wall of the signal cavity, and wire one (28) and wire two (29) respectively disposed on the insulating seat two (27).

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