Ultrahigh and overpressure pressure sensor

Abstract

The ultrahigh and overpressure pressure sensor comprises a shell, a pressure sensing bin, a bearing box, a ventilation bin and a load shell are arranged in the shell, a connector is communicated with the pressure sensing bin, the pressure sensing bin is communicated with the load shell and the bearing box in a sealed mode through a first positive pressure pipe and a second positive pressure pipe, and a piston plate is arranged in the second positive pressure pipe; the piston plate is connected with a sensor core body on a supporting assembly in the bearing box through an ejector rod. The protective diaphragm in the load shell is divided into a positive pressure cavity and a negative pressure cavity, the rated deformation pressure of the protective diaphragm is between the use range and the overload pressure of the sensor core body, the negative pressure cavity is provided with a buffer assembly comprising a collision plate and a buffer mechanism, the sensor is purely mechanically triggered to release overpressure through the protective diaphragm, the core body is prevented from being damaged, and the response is not delayed; the buffer assembly absorbs impact, prevents failure of the diaphragm, prolongs the service life, adapts to an instantaneous overpressure scene, and improves the durability.

Description

Technical Field

[0001] This invention relates to the field of pressure sensor technology, and in particular to an ultra-high overpressure pressure sensor. Background Technology

[0002] Pressure sensors are core detection components in hydraulic systems, industrial equipment, and other fields. They are used to monitor fluid pressure parameters in real time and provide data support for judging equipment operating status and safety management.

[0003] When using existing pressure sensors, the normal operating pressure is within the sensor's range and will not affect the sensor. However, overpressure may occasionally occur, especially at the moment the hydraulic pump starts and stops. The instantaneous pressure may greatly exceed the sensor's range, which tests the sensor's overload capacity. Conventional sensors transmit pressure directly to the sensor chip through the medium. When the instantaneous pressure exceeds the chip's overload capacity, it can easily break down the chip and damage the pressure sensor. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide an ultra-high overpressure pressure sensor that solves the problems of the core being easily damaged by instantaneous overpressure and the electronic protection scheme having a delayed response, resulting in a short service life of the core.

[0005] The present invention also provides an ultra-high overpressure sensor, comprising: a housing, wherein a pressure-sensing chamber, a support box, a venting chamber, and a load shell are fixedly connected within the housing; the venting chamber communicates with the outside of the housing; a connector is fixedly connected to the bottom of the housing, and the connector communicates with the pressure-sensing chamber; a pressure-sensing diaphragm is slidably and sealed within the pressure-sensing chamber; the pressure-sensing chamber and the load shell are sealed and connected via a positive pressure pipe; the load shell and the support box are sealed and connected via a second positive pressure pipe; a piston plate is slidably and sealed within the second positive pressure pipe; a support assembly is provided within the support box, and a sensor core is embedded and fixedly mounted on the support assembly. A push rod is fixedly connected between the piston plate and the sensor core; the load shell and the ventilation chamber are sealed and connected through a negative pressure pipe, and the bearing box and the negative pressure pipe are sealed and connected through a second negative pressure pipe; a protective diaphragm is fixedly connected to the inner surface of the load shell, the rated deformation pressure of the protective diaphragm is greater than the operating range of the sensor core and less than its overload pressure, and the protective diaphragm divides the interior of the load shell into a positive pressure chamber and a negative pressure chamber; a buffer assembly is provided in the negative pressure chamber, the buffer assembly includes an impact plate movably connected in the negative pressure chamber and abutting against the protective diaphragm, and a buffer mechanism for supporting the impact plate and buffering its impact force.

[0006] Preferably, the positive pressure chamber, positive pressure tube one, positive pressure tube two, and pressure sensing chamber form a closed conduction channel, and the conduction channel is filled with silicone oil as a pressure conduction medium, and the negative pressure chamber is connected to the negative pressure tube one.

[0007] Preferably, the support assembly includes a reset spring fixed to the inner surface of the support box, and a support plate fixed to the free end of the reset spring, wherein the sensor core is embedded and fixed in the support plate.

[0008] Preferably, a limiting plate is fixedly connected to the inner wall of the bearing box, and the bearing plate and the limiting plate abut against each other to limit the displacement stroke of the bearing plate.

[0009] Preferably, the buffer mechanism includes a slide rail fixed to the inner surface of the negative pressure chamber, and two sliders symmetrically sliding within the slide rail; the upper surface of the impact plate is hinged with two cranks, the free ends of the two cranks facing opposite directions, and respectively hinged to the bottom of the corresponding sliders.

[0010] Preferably, the buffer mechanism further includes a buffer spring and a damper, both of which are fixed between the slider and the inner wall of the negative pressure chamber and are arranged in parallel. Beneficial effects

[0011] The ultra-high overpressure pressure sensor of this technical solution uses a protective diaphragm with a rated deformation pressure greater than the sensor core's operating range but less than its overload pressure. When overpressure occurs, the diaphragm deforms into the negative pressure chamber, releasing the excess pressure in the silicone oil in the conduction channel in a timely manner. This effectively blocks the overpressure from being conducted to the sensor core, preventing the core from being damaged by instantaneous overpressure. Moreover, it is purely mechanically triggered, requiring no electronic components and has no response delay. The buffer components inside the negative pressure chamber can effectively absorb the instantaneous impact force when the protective diaphragm deforms, avoid rigid collision between the diaphragm and the wall of the negative pressure chamber, prevent fatigue tearing or deformation failure, and significantly extend the service life of the protective diaphragm. Attached Figure Description

[0012] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a front view structural diagram of the ultra-high overpressure pressure sensor of the present invention; Figure 2 This is a cross-sectional view of the housing structure of the ultra-high overpressure pressure sensor of the present invention; Figure 3 This is a partially enlarged structural diagram of the buffer mechanism of the ultra-high overpressure pressure sensor of the present invention.

[0013] Legend: 1. Negative pressure tube one; 2. Ventilation chamber; 3. Negative pressure tube two; 4. Sensor core; 5. Carrier box; 6. Reset spring; 7. Limiting plate; 8. Carrier plate; 9. Top rod; 10. Piston plate; 11. Protective diaphragm; 12. Load shell; 13. Positive pressure tube two; 14. Housing; 15. Positive pressure tube one; 16. Pressure-sensitive chamber; 17. Pressure-sensitive diaphragm; 18. Connector; 19. Slide rail; 20. Crank; 21. Slider; 22. Buffer spring; 23. Damper; 24. Impact plate. Detailed Implementation

[0014] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0015] Reference Figure 1-3 An embodiment of the present invention discloses an ultra-high overpressure pressure sensor, comprising: a housing 14, wherein a pressure-sensing chamber 16, a bearing box 5, a venting chamber 2, and a load shell 12 are fixedly connected inside the housing 14, the venting chamber 2 is in communication with the outside of the housing 14, and a connector 18 is fixedly connected to the bottom of the housing 14, the connector 18 being in communication with the pressure-sensing chamber 16; a pressure-sensing diaphragm 17 is slidably and sealed inside the pressure-sensing chamber 16, the pressure-sensing chamber 16 and the load shell 12 are sealed and connected through a positive pressure pipe 15, the load shell 12 and the bearing box 5 are sealed and connected through a positive pressure pipe 13, a piston plate 10 is slidably and sealed inside the positive pressure pipe 13; a support assembly is provided inside the bearing box 5, a sensor core 4 is embedded and fixed on the support assembly, and a top rod 9 is fixedly connected between the piston plate 10 and the sensor core 4; the load shell 12 and the venting chamber 2 are sealed and connected through a negative pressure pipe 1, and the bearing box 5 and the negative pressure pipe 1 are sealed and connected through a negative pressure pipe 3. Specifically: The sensor core is the core pressure-sensitive component in existing pressure sensors. It can convert the sensed physical pressure signal into a detectable electrical signal, providing core support for the acquisition and output of pressure parameters. The sensor core is a mature technology that is well-known in this field, so it will not be elaborated on in this document.

[0016] External pressure medium enters the pressure-sensitive chamber 16 through connector 18, pushing the pressure-sensitive diaphragm 17. The pressure is then transmitted to the piston plate 10 through the sealed positive pressure tube 15 and positive pressure tube 2 13, and then transmitted to the sensor core 4 through the push rod 9. The ventilation chamber 2 maintains the negative pressure side and the outside atmosphere, realizing the pressure-sealed transmission, avoiding medium leakage and air pressure imbalance, and providing a structural basis for subsequent accurate detection and overpressure protection. Considering that the traditional sensor core 4 is easily broken down by instantaneous overpressure and that the electronic protection scheme has a response delay problem, a protective diaphragm 11 is fixed to the inner surface of the load shell 12. The rated deformation pressure of the protective diaphragm 11 is greater than the operating range of the sensor core 4 and less than its overload pressure. The protective diaphragm 11 divides the inside of the load shell 12 into a positive pressure chamber and a negative pressure chamber. Under normal pressure, the protective diaphragm 11 remains stationary. When the pressure exceeds its rated deformation pressure, the protective diaphragm 11 deforms into the negative pressure chamber, releasing the excess pressure in the silicone oil in the conduction channel. The purely mechanical triggering has no response delay, effectively blocking the overpressure from being conducted to the sensor core 4, and preventing the sensor core 4 from being damaged by instantaneous overpressure. Considering that the protective diaphragm 11 is prone to fatigue tearing or deformation failure when subjected to overpressure deformation, a buffer assembly is provided in the negative pressure chamber. The buffer assembly includes an impact plate 24 movably connected in the negative pressure chamber and abutting against the protective diaphragm 11, and a buffer mechanism for supporting the impact plate 24 and buffering its impact force. The buffer mechanism includes a slide rail 19 fixed to the inner surface of the negative pressure chamber, and two sliders 21 symmetrically sliding in the slide rail 19. Two cranks 20 are hinged to the upper surface of the impact plate 24. The free ends of the two cranks 20 face opposite directions and are respectively hinged to the bottom of the corresponding sliders 21. The buffer mechanism also includes a buffer spring 22 and a damper 23. The buffer spring 22 and the damper 23 are both fixed between the sliders 21 and the inner wall of the negative pressure chamber and are arranged in parallel. When the protective diaphragm 11 deforms, it impacts the impact plate 24. The crank 20 drives the slider 21 to slide along the slide rail 19. The buffer spring 22 and the damper 23 are connected in parallel to absorb and weaken the impact energy, dissipate the instantaneous impact force of the deformation of the protective diaphragm 11, prevent the protective diaphragm 11 from being damaged, and significantly extend the service life of the protective diaphragm 11.

[0017] In summary, the improvement of this embodiment lies in: The protective diaphragm 11, whose rated deformation pressure is greater than the range of the sensor core 4 but less than its overload pressure, deforms into the negative pressure chamber when overpressure occurs, releasing the excess pressure in the silicone oil in the conduction channel in time, effectively blocking the overpressure from being conducted to the sensor core 4, and preventing the sensor core 4 from being damaged by instantaneous overpressure. It is a purely mechanical trigger, requiring no electronic components and has no response delay. The buffer component inside the negative pressure chamber can effectively absorb the instantaneous impact force when the protective diaphragm 11 deforms, avoid rigid collision between the protective diaphragm 11 and the wall of the negative pressure chamber, prevent fatigue tearing or deformation failure, and significantly extend the service life of the protective diaphragm 11.

[0018] Based on the above, other structures also need to be disclosed in detail, such as: The positive pressure chamber, positive pressure tube 15, positive pressure tube 2 13, and pressure sensing chamber 16 form a closed conduction channel. The conduction channel is filled with silicone oil as the pressure conduction medium. The negative pressure chamber is connected to the negative pressure tube 1. The positive pressure chamber, positive pressure tube 15, positive pressure tube 2 13 and pressure sensing chamber 16 form a closed conduction channel. Silicone oil is used as a medium to transmit pressure. The negative pressure chamber is connected to the ventilation chamber 2 through negative pressure tube 1, which ensures stable and linear pressure transmission, maintains air pressure balance on the negative pressure side and improves the reliability of sensor detection data.

[0019] The support assembly includes a return spring 6 fixed to the inner surface of the bearing box 5, and a bearing plate 8 fixed to the free end of the return spring 6. The sensor core 4 is embedded and fixed in the bearing plate 8. A limit plate 7 is fixed to the inner wall of the bearing box 5. The bearing plate 8 and the limit plate 7 abut against each other to limit the displacement stroke of the bearing plate 8. When pressure is applied, the bearing plate 8 drives the sensor core 4 to move. The reset spring 6 provides the reset driving force, and the limit plate 7 limits the maximum displacement stroke of the bearing plate 8 to ensure that the sensor core 4 quickly resets after being subjected to force, avoids damage to the sensor core 4 due to excessive displacement, and further extends the service life of the sensor core components.

[0020] Working principle: External pressure medium enters the pressure-sensitive chamber 16 through connector 18, pushes the pressure-sensitive diaphragm 17, and transmits the pressure through the silicone oil in the closed conduction channel formed by positive pressure tube 15, positive pressure tube 2 13 and positive pressure chamber to the piston plate 10 in positive pressure tube 2 13. The piston plate 10 drives the push rod 9 to push the sensor core 4 on the support plate 8 to realize pressure parameter detection. The reset spring 6 inside the carrier box 5 provides a reset driving force for the sensor core 4, and the limiting plate 7 limits the maximum displacement of the carrier plate 8 to avoid damage to the core due to excessive displacement.

[0021] The ventilation chamber 2 is connected to the negative pressure chamber of the load shell 12 and the bearing box 5 through negative pressure pipe 1 and negative pressure pipe 3 respectively, to maintain the air pressure balance between the negative pressure side and the outside atmosphere and ensure the linearity of pressure transmission.

[0022] Under normal pressure, the protective diaphragm 11 remains stationary and does not affect pressure transmission. When the pressure exceeds its rated deformation pressure (greater than the core's operating range but less than the overload pressure), the protective diaphragm 11 deforms into the negative pressure chamber, releasing the excess pressure in the silicone oil and blocking the overpressure from being transmitted to the sensor core 4. Simultaneously, the protective diaphragm 11 impacts the impact plate 24, causing the slider 21 to slide along the slide rail 19 via the crank 20. The buffer spring 22 and the damper 23 work in parallel to absorb and weaken the impact energy, preventing the protective diaphragm 11 from being rigidly damaged by collision. The entire system achieves precise detection, instantaneous overpressure protection, and component protection through a purely mechanical structure.

[0023] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A high overpressure sensor, characterized in that, include: The housing (14) has a pressure-sensitive chamber (16), a bearing box (5), a ventilation chamber (2) and a load shell (12) fixedly connected inside it. The ventilation chamber (2) is in communication with the outside of the housing (14). The bottom of the housing (14) is fixedly connected to a connector (18), which is in communication with the pressure-sensitive chamber (16). The pressure-sensitive chamber (16) is fitted with a pressure-sensitive diaphragm (17) in a sliding seal. The pressure-sensitive chamber (16) and the load shell (12) are sealed and connected through a positive pressure pipe (15). The load shell (12) and the carrier box (5) are sealed and connected through a positive pressure pipe (13). A piston plate (10) is fitted with a sliding seal inside the positive pressure pipe (13). The support box (5) is provided with a support assembly, and a sensor core (4) is embedded and fixed on the support assembly. A top rod (9) is fixed between the piston plate (10) and the sensor core (4). The load shell (12) and the ventilation chamber (2) are sealed and connected through negative pressure pipe one (1), and the bearing box (5) and the negative pressure pipe one (1) are sealed and connected through negative pressure pipe two (3); A protective diaphragm (11) is fixed to the inner surface of the load shell (12). The rated deformation pressure of the protective diaphragm (11) is greater than the operating range of the sensor core (4) and less than its overload pressure. The protective diaphragm (11) divides the interior of the load shell (12) into a positive pressure chamber and a negative pressure chamber. The negative pressure chamber is provided with a buffer assembly, which includes an impact plate (24) movably connected to the negative pressure chamber and abutting against the protective diaphragm (11), and a buffer mechanism for supporting the impact plate (24) and buffering its impact force.

2. The ultra-high overpressure sensor according to claim 1, characterized in that, The positive pressure chamber, positive pressure tube one (15), positive pressure tube two (13) and pressure sensing chamber (16) form a closed conduction channel. The conduction channel is filled with silicone oil as a pressure conduction medium. The negative pressure chamber is connected to the negative pressure tube one (1).

3. The ultra-high overpressure sensor according to claim 1 or 2, characterized in that, The support assembly includes a reset spring (6) fixed to the inner surface of the carrier box (5) and a carrier plate (8) fixed to the free end of the reset spring (6). The sensor core (4) is embedded and fixed in the carrier plate (8).

4. The ultra-high overpressure sensor according to claim 3, characterized in that, The inner wall of the bearing box (5) is fixedly connected to a limiting plate (7), and the bearing plate (8) abuts against the limiting plate (7) to limit the displacement stroke of the bearing plate (8).

5. The ultra-high overpressure sensor according to any one of claims 1-4, characterized in that, The buffer mechanism includes a slide rail (19) fixed to the inner surface of the negative pressure chamber, and two sliders (21) symmetrically sliding within the slide rail (19). The upper surface of the impact plate (24) is hinged with two cranks (20), the free ends of the two cranks (20) are facing opposite directions and are respectively hinged to the bottom of the corresponding slider (21).

6. The ultra-high overpressure sensor according to claim 5, characterized in that, The buffer mechanism also includes a buffer spring (22) and a damper (23), which are both fixed between the slider (21) and the inner wall of the negative pressure chamber and are arranged in parallel.

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