Pressure sensor with overload protection function

Abstract

The utility model discloses a pressure sensor with overload protection function, including sensor body and mobile cavity, sensor body one end is equipped with detection interface, sensor body is equipped with the drive board in, drive board lower extreme is equipped with the link rod, the link rod is connected with extrusion disc, sensor body is located and is equipped with a pair of limit slot, limit slot all are vertically equipped with the limit rod, mobile cavity lower extreme is fixedly equipped with pressure sensing diaphragm and processing chip, extrusion disc is located in mobile cavity, extrusion disc and mobile cavity, pressure sensing diaphragm jointly enclose the sealed inner chamber, the inner chamber is filled with medium, the utility model need not electronic control element to participate, thoroughly avoids the protection failure risk of signal drift, circuit failure or response delay, can still ensure that pressure sensing diaphragm is exempt from plastic deformation damage under the extreme working condition such as strong electromagnetic interference, high temperature and high pressure environment, and the reliability and life of core element are improved significantly.

Description

Technical Field

[0001] This utility model relates to the field of pressure sensor protection technology, specifically a pressure sensor with overload protection function. Background Technology

[0002] A pressure sensor is a device or apparatus that can sense pressure signals and convert them into usable output electrical signals according to certain rules. Pressure sensors typically consist of a pressure-sensitive element and a signal processing unit. They are one of the most commonly used sensors in industrial practice, widely applied in various industrial automation environments, including water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemicals, oil wells, power, shipbuilding, machine tools, and pipelines. Patent application number CN201922037275.3 discloses a pressure sensor with overload protection, comprising a housing, inside which protective components and a sensitive component are installed. This pressure sensor with overload protection works by using a reset device and a magnetic device in the protection assembly. When the pressure value of the pressure sensing block reaches the set value of the adjustment element in the control element, the second electromagnet in the limit block is energized first, causing the moving block to enter the interior of the fixed block. Then, the first electromagnet is energized, generating a magnetic force that causes the lifting block to move down, thereby moving the sensitive element connected to the lifting block down to protect the sensitive element and prevent damage to the sensitive element due to excessive pressure. When the magnetic device is de-energized, the elastic force of the first and second springs allows the sensitive element and the limit block to automatically reset and resume normal use, thus achieving the purpose of automatic overload protection.

[0003] Based on the above, the inventors have discovered the following problems: While the aforementioned device can effectively protect pressure sensors from overload using control elements, it overlooks the fact that electronic protection relies on the integrity and real-time performance of sensor signals, control logic, and actuator responses. Failure in any of these components (such as signal drift, software errors, component failure, or communication interruption) can lead to protection failure. Mechanical protection, on the other hand, is based on direct physical action. Its actions are typically more direct and less susceptible to complex electrical environments. Therefore, in critical applications requiring extremely high safety and reliability, mechanical overload protection is often a superior or essential supplementary solution. Utility Model Content

[0004] The purpose of this invention is to provide a pressure sensor with overload protection function to solve the problems mentioned in the background art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A pressure sensor with overload protection function, comprising a sensor body and a moving cavity. One end of the sensor body is provided with a detection interface, and the end of the sensor body away from the detection interface is provided with an electrical connector. A drive plate is provided inside the sensor body, with its outer side fitting against the inner wall of the sensor body. A connecting rod is provided at the lower end of the drive plate. A pressing disc is connected to the connecting rod. A pair of limiting grooves are formed inside the sensor body, each containing a vertically positioned limiting rod. The moving cavity is located inside the sensor body, and its sidewall is slidably connected to the limiting rods. A spring is fitted onto the limiting rods. A limiting ring is provided at the upper end of the moving cavity, and a pressure-sensing diaphragm and a processing chip are fixedly mounted at the lower end of the moving cavity. A data transmission line is provided at the lower end of the processing chip. The pressing disc is located inside the moving cavity, and its outer side is sealed against the inner wall of the moving cavity. The pressing disc, the moving cavity, and the pressure-sensing diaphragm together form a sealed inner cavity, which is filled with a medium.

[0006] Furthermore, one end of the spring is connected to the lower end of the moving cavity, and the other end of the spring is fixedly connected to the bottom end of the limiting groove.

[0007] Furthermore, the data transmission line is electrically connected to the electrical connector.

[0008] Furthermore, the pressure-sensitive diaphragm is located above the processing chip, and the pressure-sensitive diaphragm is electrically connected to the processing chip.

[0009] Furthermore, the inner diameter of the limiting ring is smaller than the outer diameter of the drive plate; the outer diameter of the extrusion plate is larger than the inner diameter of the limiting ring and is the same as the inner diameter of the moving cavity.

[0010] Furthermore, the sliding contact surface between the outer wall of the moving cavity and the limiting rod, and the sealing contact surface between the outer wall of the extrusion plate and the inner wall of the moving cavity are smooth surfaces.

[0011] Compared with the prior art, the beneficial effects of this utility model are: the pressure sensor with overload protection function is reasonable and has the following advantages: (1) When the overload pressure pushes the drive plate to contact the limit ring, the moving cavity is forced to move down along the limit rod, while the extrusion plate is physically blocked by the limit ring and remains stationary. At this time, the continuous downward movement of the moving cavity actively expands the inner cavity volume, forming a dynamic pressure relief mechanism. The volume increase rate is greater than the pressure input rate, directly blocking the pressure transmission path to the pressure-sensitive diaphragm. This process does not require the participation of electronic control components, completely avoiding the risk of protection failure caused by signal drift, circuit failure or response delay. In extreme working conditions such as strong electromagnetic interference, high temperature and high pressure environment, it can still ensure that the pressure-sensitive diaphragm is not damaged by plastic deformation, significantly improving the reliability and life of the core components. (2) After the overload is released, the spring automatically pushes the moving cavity to the initial position along the limit rod based on the pre-compression force. The rigid guiding effect of the limit rod eliminates the risk of reset deviation and ensures that the sealing fit between the extrusion plate and the inner wall of the moving cavity is restored immediately. This process is completed autonomously without manual calibration or external intervention. This not only avoids downtime maintenance costs, but also ensures that the sensor can achieve seamless switching of "overload protection - self-recovery - measurement continuity" in continuous operation scenarios such as industrial assembly line monitoring and real-time pipeline pressure control, which greatly improves the continuity of equipment operation and system efficiency. Attached Figure Description

[0012] Figure 1 This is a three-dimensional structural diagram of the present invention; Figure 2 This is a schematic diagram of the cross-section of the present invention; Figure 3 This is a schematic diagram of the structure of this utility model during operation; Figure 4 This is an enlarged structural diagram of point A in this utility model; In the diagram: 1. Sensor body; 2. Detection interface; 3. Electrical connector; 4. Connecting rod; 5. Squeezing plate; 6. Limiting groove; 7. Moving cavity; 8. Limiting ring; 9. Pressure-sensing diaphragm; 10. Inner cavity; 11. Processing chip; 12. Data transmission line; 13. Limiting rod; 14. Drive board; 15. Spring. Detailed Implementation

[0013] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0014] Please see Figure 1-4 The present invention provides a technical solution as follows: Example: A pressure sensor with overload protection includes a sensor body 1 and a moving cavity 7. One end of the sensor body 1 has a detection interface 2, and the other end of the sensor body 1 away from the detection interface 2 has an electrical connector 3. A drive plate 14 is provided inside the sensor body 1, with its outer side fitting against the inner wall of the sensor body 1. A connecting rod 4 is provided at the lower end of the drive plate 14. The connecting rod 4 is connected to a compression disc 5. A pair of limiting grooves 6 are formed inside the sensor body 1, and each limiting groove 6 has a vertically positioned limiting rod 13. The moving cavity... 7 is located inside the sensor body 1, and the side wall of the moving cavity 7 is slidably connected to the limiting rod 13; a spring 15 is sleeved on the limiting rod 13; a limiting ring 8 is provided at the upper end of the moving cavity 7, and a pressure-sensitive diaphragm 9 and a processing chip 11 are fixedly provided at the lower end of the moving cavity 7; a data transmission line 12 is provided at the lower end of the processing chip 11; the extrusion plate 5 is located inside the moving cavity 7, and the outer side of the extrusion plate 5 is sealed and fitted to the inner wall of the moving cavity 7; the extrusion plate 5, the moving cavity 7, and the pressure-sensitive diaphragm 9 together form a sealed inner cavity 10, and the inner cavity 10 is filled with a medium.

[0015] One end of the spring 15 is connected to the lower end of the moving cavity 7, and the other end of the spring 15 is fixedly connected to the bottom end of the limiting groove 6.

[0016] The data transmission line 12 is electrically connected to the electrical connector 3.

[0017] The pressure-sensitive diaphragm 9 is located above the processing chip 11, and the pressure-sensitive diaphragm 9 is electrically connected to the processing chip 11.

[0018] The inner diameter of the limiting ring 8 is smaller than the outer diameter of the drive plate 14; the outer diameter of the extrusion plate 5 is larger than the inner diameter of the limiting ring 8 and is the same as the inner diameter of the moving cavity 7.

[0019] The sliding contact surface between the outer wall of the moving cavity 7 and the limiting rod 13, and the sealing contact surface between the outer wall of the extrusion plate 5 and the inner wall of the moving cavity 7 are smooth surfaces.

[0020] Working principle: During use, external pressure is introduced through the detection interface 2, which pushes the drive plate 14 to move into the sensor body 1; the drive plate 14 drives the extrusion plate 5 to move down in the moving cavity 7 through the connecting rod 4, compressing the medium in the sealed inner cavity 10, realizing high-precision pressure transmission and ensuring the accuracy of routine measurements; the pressure-sensing diaphragm 9 senses the pressure change in the inner cavity 10 in real time and converts it into an electrical signal. After the signal is processed by the processing chip 11, it is output to the electrical connector 3 through the data transmission line 12.

[0021] When an overload occurs, the drive plate 14 contacts the limiting ring 8, and the overload force forces the moving cavity 7 to overcome the resistance of the spring 15 and slide downward along the limiting rod 13. At this time, the extrusion plate 5 stops moving downward due to the limitation ring 8. At the same time, the continuous downward movement of the moving cavity 7 actively expands the volume of the inner cavity 10, forming a physical pressure relief, effectively preventing the pressure-sensing diaphragm 9 from bearing excessive pressure and blocking the pressure rise path. After the overload is released, the spring 15 automatically pushes the moving cavity 7 to accurately reset to the initial position along the limiting rod 13 without manual intervention, realizing the self-recovery function and ensuring continuous operation of the equipment.

[0022] It will be apparent to those skilled in the art that this invention is not limited to the details of the exemplary embodiments described above, and that it can be implemented in other specific forms without departing from the spirit or essential characteristics of this invention. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of this invention is defined by the appended claims rather than the foregoing description. Thus, it is intended that all variations falling within the meaning and scope of equivalents of the claims be included within this invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

Claims

1. A pressure sensor with overload protection function, comprising a sensor body (1) and a moving cavity (7), characterized in that: The sensor body (1) has a detection interface (2) at one end and an electrical connector (3) at the other end away from the detection interface (2). A drive plate (14) is located inside the sensor body (1), with its outer side fitting against the inner wall of the sensor body (1). A connecting rod (4) is located at the lower end of the drive plate (14). The connecting rod (4) is connected to a pressing disc (5). A pair of limiting grooves (6) are opened inside the sensor body (1), and each limiting groove (6) has a vertically positioned limiting rod (13). The moving cavity (7) is located inside the sensor body (1), and the moving cavity... The sidewall of the cavity (7) is slidably connected to the limiting rod (13); a spring (15) is sleeved on the limiting rod (13); a limiting ring (8) is provided at the upper end of the moving cavity (7), and a pressure-sensitive diaphragm (9) and a processing chip (11) are fixedly provided at the lower end of the moving cavity (7); a data transmission line (12) is provided at the lower end of the processing chip (11); the extrusion plate (5) is located inside the moving cavity (7), and the outer side of the extrusion plate (5) is sealed and fitted to the inner wall of the moving cavity (7); the extrusion plate (5), the moving cavity (7), and the pressure-sensitive diaphragm (9) together form a sealed inner cavity (10), and the inner cavity (10) is filled with a medium.

2. A pressure sensor with overload protection function according to claim 1, characterized in that: One end of the spring (15) is connected to the lower end of the moving cavity (7), and the other end of the spring (15) is fixedly connected to the bottom end of the limiting groove (6).

3. A pressure sensor with overload protection function according to claim 1 or 2, characterized in that: The data transmission line (12) is electrically connected to the electrical connector (3).

4. A pressure sensor with overload protection function according to claim 1 or 2, characterized in that: The pressure-sensitive diaphragm (9) is located above the processing chip (11), and the pressure-sensitive diaphragm (9) is electrically connected to the processing chip (11).

5. A pressure sensor with overload protection function according to claim 1, characterized in that: The inner diameter of the limiting ring (8) is smaller than the outer diameter of the drive plate (14); the outer diameter of the extrusion plate (5) is larger than the inner diameter of the limiting ring (8) and is the same as the inner diameter of the moving cavity (7).

6. A pressure sensor with overload protection function according to claim 1 or 5, characterized in that: The sliding contact surface between the outer wall of the moving cavity (7) and the limiting rod (13), and the sealing contact surface between the outer wall of the extrusion plate (5) and the inner wall of the moving cavity (7) are smooth surfaces.

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