displacement sensor

Abstract

The utility model discloses an embodiment provides a kind of displacement sensor, comprising: flange plate, one end of flange plate is equipped with electronic warehouse, the other end of flange plate is equipped with positioning shaft structure, electronic warehouse is equipped with containing cavity, positioning shaft structure is equipped with hollow structure, containing cavity is connected with hollow structure, and multiple connecting holes for connecting installation object are equipped on flange plate;Shell structure, with the one end welding of flange plate equipped with electronic warehouse, electronic warehouse is equipped in shell structure;Measuring rod structure, with hollow structure is adapted, and measuring rod structure and the one end welding of flange plate equipped with positioning shaft structure;Signal plate and sensitive component electrically connected with signal plate;Wherein, flange plate, electronic warehouse and positioning shaft structure are integrated structure.In the technical scheme of the utility model, under the action of positioning shaft structure, when displacement sensor is installed to installation object, it can guarantee concentricity, more convenient to improve sealing performance, prevent external gas or liquid into installation object.

Description

Technical Field

[0001] This utility model relates to the field of sensor technology, and more specifically, to a displacement sensor. Background Technology

[0002] Magnetostrictive displacement sensors are commonly used to detect the extension and retraction of hydraulic cylinders. In some special application scenarios where explosive gases are present, the magnetostrictive displacement sensor is usually installed with the detection part built in and the processing part external. However, during installation, it is often impossible to ensure the concentricity of the assembly position, resulting in poor sealing performance and failing to meet the application requirements in this special scenario. Utility Model Content

[0003] This invention aims to at least solve the technical problem of low concentricity in the assembly of magnetostrictive displacement sensors in explosive scenarios, which exists in existing or related technologies.

[0004] In view of this, an embodiment of the present invention provides a displacement sensor.

[0005] To achieve the above objectives, embodiments of this utility model provide a displacement sensor, comprising: a flange plate, one end of which has an electronic compartment, and the other end of which has a positioning shaft structure. The electronic compartment has a receiving cavity, and the positioning shaft structure has a hollow structure. The receiving cavity is connected to the hollow structure. The flange plate has multiple connection holes for connecting and installing objects. A housing structure is welded to the end of the flange plate where the electronic compartment is located, and the electronic compartment is located within the housing structure. A measuring rod structure is adapted to the hollow structure, and the measuring rod structure is welded to the end of the flange plate where the positioning shaft structure is located. A signal board and a sensitive component electrically connected to the signal board, the sensitive component including a position sensing element, the signal board being located within the receiving cavity, and the position sensing element being located within the measuring rod structure. The flange plate, the electronic compartment, and the positioning shaft structure are an integral structure.

[0006] The displacement sensor proposed in this utility model achieves high-precision and long-life displacement measurement through the coordinated operation of the flange plate, electronic compartment, positioning shaft structure, signal plate, measuring rod structure, outer shell structure, and internal sensitive components and position sensing elements. Its compact structural design ensures excellent explosion-proof performance, sealing performance, and mechanical connection strength, making it suitable for use in Zone 1 and Zone 2 environments containing Class II explosive gases.

[0007] Specifically, one end of the flange plate connects to the electronic compartment, while the other end is equipped with a positioning shaft structure. The flange plate has multiple connection holes for fixing and installing with external equipment. The flange plate, electronic compartment, and positioning shaft structure are integrally molded, enhancing the flange plate's sealing and explosion-proof performance. As a core connecting component, the flange plate provides mechanical fixing and positioning functions for the sensor.

[0008] Furthermore, the flange plate is fixed to the installation object through evenly distributed connection holes, and its integrated design with the electronic compartment and positioning shaft structure provides overall rigidity and stability, eliminates potential leakage points, and improves explosion-proof and sealing effects. The even distribution of multiple connection holes ensures uniform stress during installation, enhancing connection strength. The electronic compartment contains a receiving cavity, externally enclosed by a housing assembly. The electronic compartment is fixedly installed via the flange plate and connected to the measuring rod structure through the positioning shaft structure. The electronic compartment is fixedly connected to the flange plate, and the internal receiving cavity is used to install the signal board and sensitive components. The signal board is electrically connected to the position sensing element. The receiving cavity provides a sealed space for the signal board and sensitive components, protecting the circuitry from external interference.

[0009] It is important to emphasize that this solution incorporates a positioning shaft structure, specifically located at the other end of the flange plate. This shaft has a hollow interior that connects to the receiving cavity of the electronic compartment to accommodate the measuring rod structure. The positioning shaft structure ensures concentricity during assembly. On one hand, it ensures alignment between the measuring rod structure and the flange plate and electronic compartment. On the other hand, the positioning shaft structure also facilitates better sealing performance when installing the displacement sensor onto the mounting object, preventing external gases or liquids from entering the mounting object.

[0010] It should be noted that the outer shell structure and the measuring rod structure are welded to both ends of the flange plate. Specifically, the outer shell structure is welded to one end of the electronic compartment, and the measuring rod structure is welded to one end of the positioning shaft structure. This allows the flange plate, outer shell structure, and measuring rod structure to form a single external structure through welding. There is a certain space inside to accommodate the internal structure, which mainly includes an electrically connected signal board and a sensitive component. When assembled, the signal board is located inside the electronic compartment, and the position sensing element of the sensitive component is located inside the measuring rod structure.

[0011] In some technical solutions, optionally, a positioning groove is also included, located at the end of the flange plate where the electronic compartment is located; wherein the outer shell structure is welded to the positioning groove.

[0012] In this technical solution, a positioning groove is set at one end of the flange plate where the electronic compartment is located, and an annular groove is formed along its circumference for the installation and fixing of the outer shell structure.

[0013] The outer shell structure and the positioning groove are connected by welding to form a sealed and robust integral structure. The positioning groove provides a positioning reference for the outer shell structure and the flange plate, ensuring the accuracy of the welding position.

[0014] In some technical solutions, optionally, the end of the housing structure away from the flange plate is provided with a mounting port, through which the signal plate and the sensing component extend into the receiving cavity and the hollow structure; the displacement sensor also includes: a top cover structure, which is used to connect to the mounting port when the signal plate and the sensing component are located inside the receiving cavity and the hollow structure.

[0015] In this solution, by providing an installation port at one end of the outer shell structure and welding the upper cover structure with the installation port, the displacement sensor can be fully sealed. It can be understood that the displacement sensor, through the fully enclosed design of the outer shell structure and the upper cover structure, together with the flange plate, electronic compartment, measuring rod structure and sensitive components, can achieve high-precision displacement measurement, while ensuring that the sensor has excellent sealing performance, anti-environmental interference ability and structural strength.

[0016] The outer casing encloses the electronic compartment, providing external protection. An installation port is located at the end of the outer casing away from the flange plate for connecting to the top cover structure. The outer casing is fixed to the flange plate's positioning groove by welding, forming a robust integrated structure. After the signal board and sensitive components are inserted into the internal space and installed in place—that is, with the signal board and sensitive components located within the receiving cavity and hollow structure respectively—the top cover structure can be fitted and connected to the installation port to form a closed space. Specific connection methods include, but are not limited to, mechanical snap-fit ​​or threaded connections, and even direct welding. The outer casing, flange plate, and top cover structure together form a closed explosion-proof structure, adapting to measurement needs in complex environments.

[0017] In some technical solutions, the system may optionally include: a pressure relief hole, located on the housing structure, extending radially along the flange plate; and a pressure relief component, detachably connected to the pressure relief hole.

[0018] In this technical solution, pressure relief holes and pressure relief components are added to the outer shell structure, which further enhances the safety and stability of the displacement sensor in extreme environments, thereby effectively coping with adverse working conditions such as high temperature and pressure fluctuations, ensuring the safe operation of the internal electronic compartment and sensitive components, and extending the equipment life.

[0019] Specifically, the pressure relief hole is located on the outer shell structure and extends radially along the flange plate. The pressure relief hole is a through hole design and communicates with the inner cavity of the electronic compartment, serving as a channel for the release of internal gas.

[0020] Furthermore, the pressure relief hole is located close to the flange plate in order to minimize the internal gas pressure difference.

[0021] The pressure relief component is designed as a detachable assembly, connecting to the pressure relief port via threads or other fastening methods to ensure a secure seal while facilitating disassembly and maintenance. The component is typically made of a high-strength, corrosion-resistant alloy, capable of withstanding pressure variations in complex environments.

[0022] In some technical solutions, optionally, a first seal is also included, disposed between the pressure relief hole and the pressure relief element.

[0023] In this technical solution, the first sealing element is located between the pressure relief hole and the pressure relief component. It can be fixed in the reserved groove on the inner wall of the pressure relief hole by embedding or press-fitting, forming a tight fit with the outer wall of the pressure relief component. Under normal working conditions, the first sealing element effectively prevents minor leakage between the pressure relief hole and the pressure relief component, while ensuring that the passage is unobstructed and safe under pressure relief conditions.

[0024] In some technical solutions, the hollow structure optionally includes a connecting hole and a positioning hole, with the two ends of the connecting hole connected to the positioning hole and the receiving cavity respectively. The diameter of the connecting hole is smaller than the diameter of the positioning hole, and one end of the measuring rod structure abuts against the bottom of the positioning hole.

[0025] In this technical solution, the hollow structure includes a connecting hole and a positioning hole. The connecting hole is a long, narrow hole penetrating the flange plate, with its two ends connected to the positioning hole and the receiving cavity, respectively. The diameter of the connecting hole is designed to be smaller than that of the positioning hole, forming a transitional structure with a gradually increasing aperture. One end of the connecting hole connects to the positioning hole, and the other end connects to the receiving cavity, providing a guiding path for the measuring rod structure and connecting the signal transmission channel.

[0026] It is understandable that the connecting holes and positioning holes together form a stepped hole structure.

[0027] In some technical solutions, optionally, it also includes: an insulating cover adapted to the shape of the receiving cavity, with the sensitive component disposed inside the insulating cover; and / or a shielding cover adapted to the shape of the receiving cavity, with the sensitive component disposed inside the shielding cover.

[0028] In this technical solution, by incorporating at least one of an insulating cover and a shielding cover, more comprehensive protection and functional optimization can be provided for sensitive components. Specifically, the insulating cover prevents signal interference and short circuits through electrical isolation; the shielding cover ensures the accuracy of signal transmission by shielding against external electromagnetic interference.

[0029] The insulating cover, made of insulating material, is a structure adapted to the shape of the receiving cavity and can completely enclose the sensitive component. Its shape fits tightly to the receiving cavity, forming a stable protective layer. The insulating cover is installed inside the receiving cavity, and the sensitive component is embedded within it, secured by the fit between the insulating cover and the receiving cavity.

[0030] The shielding cover is also adapted to the shape of the receiving cavity and is usually made of a highly conductive metal material, providing electromagnetic shielding. The shielding cover completely encloses the sensitive component, providing multiple layers of protection. Installed inside the receiving cavity, the shielding cover is tightly integrated with the cavity and the sensitive component, stably connected via fixed points or embedded methods, blocking external electromagnetic interference and ensuring the accuracy of signal transmission from the sensitive component, with particularly significant performance in high electromagnetic interference environments.

[0031] In some technical solutions, optionally, the following are also included: a grounding hole, provided on the flange plate; and a grounding component, threadedly connected to the grounding hole.

[0032] In this technical solution, by setting up a grounding hole and a grounding component, necessary grounding protection is provided for the displacement sensor, ensuring the safe operation of the equipment in high-voltage or electromagnetic interference environments. The grounding hole is located on the flange plate, and the grounding hole and the grounding component are connected by threads, ensuring that the grounding component is securely installed on the flange plate. The cooperation between the grounding hole and the grounding component allows the sensor to effectively establish a grounding connection with external equipment through the grounding component, preventing equipment damage caused by static electricity accumulation or electromagnetic interference, providing the necessary electrical grounding path, and ensuring that the sensor system will not cause safety hazards or circuit failures when operating in high-voltage environments.

[0033] In some technical solutions, the following may be optionally included: a sealing groove, disposed on the outer wall of the positioning shaft structure; and a second sealing element, disposed corresponding to the sealing groove, the second sealing element being sleeved on the outside of the positioning shaft structure.

[0034] By setting a sealing groove and a second sealing element, the sealing performance of the device is further improved, ensuring an effective seal between the positioning shaft structure and the external environment, preventing dust, moisture or other harmful substances from entering the device, and improving the durability and long-term stability of the sensor.

[0035] The sealing groove is located on the outer wall of the positioning shaft structure and is usually distributed axially to accommodate the second seal. The sealing groove mates with the second seal, and the space within the groove stabilizes the second seal, forming a sealed connection.

[0036] In some technical solutions, optionally, the following components are included: a magnetic ring, fitted over the outside of the measuring rod structure, used to transmit magnetic signals to the position sensing element; and a non-magnetic gasket, located at the end of the magnetic ring away from the flange plate, used to isolate the magnetic ring from the mounting object.

[0037] By incorporating a magnetic ring and a non-magnetic pad, the effectiveness of the sensor in magnetic signal transmission is enhanced, and the influence between the magnetic ring and the installed object is effectively isolated, ensuring accurate measurement by the position sensing element and long-term stability of the equipment. Specifically, the magnetic ring is fitted onto the outside of the measuring rod structure and is typically designed as a ring, with a built-in or embedded magnetic core to enhance the transmission efficiency of the magnetic signal. The material of the magnetic ring is usually a magnetic alloy or other material with good magnetic conductivity to ensure efficient generation and transmission of the magnetic field.

[0038] The magnetic ring and the position sensing element transmit signals via a magnetic field. The position sensing element detects changes in the magnetic field and converts them into electrical signals. The magnetic ring's function is to effectively transmit the magnetic signal to the position sensing element through its built-in magnetic field, ensuring accurate displacement sensing. This stable magnetic field transmission ensures that the position sensing element obtains an accurate position signal, thereby improving the accuracy and response speed of displacement measurement.

[0039] Additional aspects and advantages of this invention will become apparent in the description that follows, or may be learned by practice of this invention. Attached Figure Description

[0040] Figure 1 A schematic diagram of the structure of a displacement sensor according to an embodiment of the present invention is shown;

[0041] Figure 2 A schematic diagram of the structure of a displacement sensor according to an embodiment of the present invention is shown;

[0042] Figure 3 A schematic diagram of the structure of a flange plate according to an embodiment of the present invention is shown;

[0043] Figure 4 A schematic diagram of the structure of a flange plate according to an embodiment of the present invention is shown.

[0044] in, Figures 1 to 4 The correspondence between the reference numerals and component names in the attached drawings is as follows:

[0045] 100: Displacement sensor; 102: Flange plate; 1022: Electronic compartment; 1024: Positioning shaft structure; 1026: Connecting hole; 1032: Receiving cavity; 1034: Hollow structure; 1036: Connecting hole; 1038: Positioning hole; 104: Signal board; 1042: Sensing component; 106: Measuring rod structure; 1062: Position sensing element; 1082: Housing structure; 1084: Mounting port; 1086: Top cover structure; 110: Positioning groove; 1122: Pressure relief hole; 1124: Pressure relief component; 1126: First sealing component; 114: Waterproof connector; 1142: Cable; 116: Insulating cover; 118: Shielding cover; 120: End cap; 1202: Extension thread; 1222: Grounding hole; 1224: Grounding component; 1242: Sealing groove; 1244: Second sealing component; 126: Magnetic ring; 128: Non-magnetic gasket; 130: Clamping screw; 132: Sensing element bracket. Detailed Implementation

[0046] To better understand the above-mentioned objectives, features, and advantages of the embodiments of this utility model, the embodiments of this utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be noted that, unless otherwise specified, the embodiments and features described in these embodiments can be combined with each other.

[0047] Many specific details are set forth in the following description in order to provide a full understanding of this application. However, embodiments of the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of this application is not limited to the specific embodiments disclosed below.

[0048] The following reference Figures 1 to 4 Some embodiments according to the present invention are described.

[0049] like Figure 1 , Figure 2 and Figure 4 As shown, this embodiment provides a displacement sensor 100. Through the coordinated operation of the flange plate 102, electronic compartment 1022, positioning shaft structure 1024, signal board 104, measuring rod structure 106, housing structure 1082, and internal sensitive components 1042 and position sensing elements 1062, it can achieve high-precision and long-life displacement measurement. Its compact structural design ensures that the sensor has excellent explosion-proof performance, sealing performance, and mechanical connection strength, making it suitable for use in Zone 1 and Zone 2 environments containing Class II explosive gases.

[0050] Specifically, one end of the flange plate 102 is connected to the electronic compartment 1022, and the other end is provided with a positioning shaft structure 1024, such as... Figure 3 As shown, the flange plate 102 has multiple connection holes 1026 for fixed installation with external equipment. The flange plate 102, the electronic compartment 1022, and the positioning shaft structure 1024 are integrally formed, enhancing the sealing and explosion-proof performance of the flange plate 102. As a core connecting component, the flange plate 102 provides mechanical fixing and positioning functions for the sensor.

[0051] Furthermore, the flange plate 102 is fixed to the installation object through evenly distributed connection holes 1026, and is integrated with the electronic compartment 1022 and the positioning shaft structure 1024, providing overall rigidity and stability, eliminating potential leakage points, and improving explosion-proof and sealing effects. The even distribution of multiple connection holes 1026 ensures uniform stress during installation and enhances connection strength. The electronic compartment 1022 has a receiving cavity 1032, and is externally covered by an outer shell structure 1082. The electronic compartment 1022 is fixedly installed via the flange plate 102 and communicates with the measuring rod structure 106 via the positioning shaft structure 1024. The electronic compartment 1022 is fixedly connected to the flange plate 102, and the internal receiving cavity 1032 is used to install the signal board 104 and the sensitive component 1042. The signal board 104 is electrically connected to the position sensing element 1062. The receiving cavity 1032 provides a closed space for the signal board 104 and the sensitive component 1042, protecting the circuit from external interference.

[0052] It should be noted that a housing structure 1082 and a measuring rod structure 106 are welded to both ends of the flange plate 102, respectively. Specifically, the housing structure 1082 is welded to one end of the electronic compartment 1022, and the measuring rod structure 106 is welded to one end of the positioning shaft structure 1024. This allows the flange plate 102, housing structure 1082, and measuring rod structure 106 to form an integral external structure through welding. There is a certain space inside to accommodate the internal structure. The internal structure mainly includes an electrically connected signal board 104 and a sensitive component 1042. When assembled, the signal board 104 is located inside the electronic compartment 1022, and the position sensing element 1062 of the sensitive component 1042 is located inside the measuring rod structure 106.

[0053] Furthermore, a sensitive element bracket 132 may be provided within the receiving cavity 1032 to fix the signal board 104 and the sensitive component 1042.

[0054] It needs to be emphasized that, such as Figure 2 As shown, this solution includes a positioning shaft structure 1024, specifically located at the other end of the flange plate 102, as follows: Figure 4 As shown, the interior has a hollow structure 1034, which communicates with the receiving cavity 1032 of the electronic compartment 1022 to accommodate the measuring rod structure 106. The positioning shaft structure 1024 is used to ensure the concentricity of the assembly position. On the one hand, it ensures that the measuring rod structure 106 is aligned with the flange plate 102 and the electronic compartment 1022. On the other hand, under the action of the positioning shaft structure 1024, it is easier to improve the sealing performance when installing the displacement sensor 100 onto the installation object, preventing external gas or liquid from entering the installation object.

[0055] The signal board 104 is installed within the receiving cavity 1032 of the electronic compartment 1022. The signal board 104 is electrically connected to the sensing component 1042 and receives signals transmitted by the position sensing element 1062. The signal board 104 is electrically connected to the position sensing element 1062 and works in conjunction with the sensing component 1042. The signal board 104 processes the signals transmitted by the position sensing element 1062 and outputs the measurement results. The measuring rod structure 106 is adapted to the positioning shaft structure 1024 and has a position sensing element 1062 embedded inside. The position sensing element 1062 is electrically connected to the sensing component 1042. The measuring rod structure 106 is installed through the hollow structure 1034 of the positioning shaft structure 1024, fixed to one end of the flange plate 102, and works together with the position sensing element 1062. The position sensing element 1062 embedded in the measuring rod structure 106 can sense changes in the position of the magnetic ring 126 and transmit the signal to the signal board 104.

[0056] It is understandable that the position sensing element 1062 senses the position information of the magnetic ring 126, providing high sensitivity and high precision signal sensing function.

[0057] The outer casing structure 1082 is fitted onto the outside of the electronic compartment 1022 and is fixedly connected to the flange plate 102, forming an integrated closed structure. The outer casing structure 1082, connected to the electronic compartment 1022 and the flange plate 102, covers the entire electronic compartment 1022, providing additional protection. The outer casing structure 1082 provides mechanical protection and a sealing effect for the sensor, preventing interference from the external environment to the internal components of the sensor. The cooperation between the positioning shaft structure 1024 and the measuring rod structure 106 ensures the concentricity of the assembly position, effectively improving sealing performance and measurement accuracy.

[0058] Furthermore, this embodiment employs the magnetostrictive principle. When the sensor operates, a pulsed current generated by the sensor hardware circuit module propagates along the waveguide wire. When the pulsed current flows through the waveguide wire at the cursor magnet, it is denoted as the "starting pulse." The circumferential magnetic field generated by the pulsed current and the axial magnetic field generated by the cursor magnet combine to form a helical magnetic field. Based on the Widmann effect of the magnetic material, the waveguide wire undergoes local instantaneous deformation and generates a torsional wave. After the torsional wave is generated, it propagates in opposite directions at certain speeds. When the torsional wave propagates to the waveguide wire covered by the detection coil, the magnetic induction intensity within the waveguide wire changes due to the inverse magnetostrictive effect. At this time, an induced voltage is generated at both ends of the detection coil, denoted as the "termination pulse." By calculating the time difference between the two, the displacement can be accurately measured. It can be understood that the waveguide wire is the position sensing element in this scheme.

[0059] In some embodiments, optionally, a positioning groove 110 is provided at one end of the flange plate 102 where the electronic compartment 1022 is provided, which is opened along its circumference to form an annular groove for the installation and fixing of the outer shell structure 1082.

[0060] The outer shell structure 1082 and the positioning groove 110 are connected by welding to form a sealed and robust integral structure. The positioning groove 110 provides a positioning reference for the outer shell structure 1082 and the flange plate 102, ensuring the accuracy of the welding position.

[0061] Understandably, the positioning groove 110 provides a fixing point for welding, allowing the housing structure 1082 to be securely mounted on the flange plate 102, forming an integrated closed structure. This design significantly improves the overall sealing performance while ensuring that the housing structure 1082 can withstand external environmental impacts (such as mechanical vibration or impact loads).

[0062] The positioning groove 110 provides a welding connection for the outer shell structure 1082, effectively reducing possible leakage points and further improving the overall explosion-proof performance and environmental adaptability of the sensor. Especially in explosive or corrosive environments, it can maintain the safe operation of internal electronic components for a long time.

[0063] In some embodiments, optionally, by providing a mounting port at one end of the housing structure and welding the upper cover structure with the mounting port, the overall sealing of the displacement sensor can be achieved. It can be understood that the displacement sensor 100 achieves high-precision displacement measurement through the fully enclosed design of the housing structure 1082 and the upper cover structure 1086, in conjunction with the flange plate 102, the electronic compartment 1022, the measuring rod structure 106 and the sensing component 1042, while ensuring that the sensor has excellent sealing performance, anti-environmental interference ability and structural strength.

[0064] The outer casing 1082 encloses the electronic compartment 1022, providing it with external protection. The end of the outer casing 1082 furthest from the flange plate 102 has a mounting port 1084 for connection to the upper cover structure 1086. The outer casing 1082 is fixed to the positioning groove 110 of the flange plate 102 by welding, forming a robust integral structure. After the signal board and sensitive components extend into the internal space and are installed in place, i.e., when the signal board and sensitive components are located in the receiving cavity and hollow structure respectively, the upper cover structure can be fitted and connected to the mounting port 1084 to form a closed space. Specific connection methods include, but are not limited to, mechanical snap-fit ​​or threaded connections, and even direct welding. The outer casing 1082, flange plate 102, and upper cover structure 1086 together form a closed explosion-proof structure, adapting to measurement needs in complex environments.

[0065] The outer casing structure 1082 is fixed to the positioning groove 110 of the flange plate 102 by welding, providing additional support and positioning functions. The structural strength of the flange plate 102 is further enhanced by the outer casing structure 1082, resulting in better overall sealing performance, especially in high-pressure or explosive environments, which can better protect the internal electronic components.

[0066] In some embodiments, optionally, such as Figure 2 As shown, a pressure relief hole 1122 and a pressure relief component 1124 are added to the outer shell structure 1082, which further enhances the safety and stability of the displacement sensor 100 in extreme environments, thereby effectively coping with adverse working conditions such as high temperature and pressure fluctuations, ensuring the safe operation of the internal electronic compartment 1022 and sensitive components 1042, and extending the equipment life.

[0067] Specifically, the pressure relief hole 1122 is provided on the outer shell structure 1082 and extends radially along the flange plate 102. The pressure relief hole 1122 is a through hole design and communicates with the inner cavity of the electronic compartment 1022, serving as a channel for releasing internal gas.

[0068] Furthermore, the pressure relief hole 1122 is located near the flange plate 102 in order to minimize the internal gas pressure difference.

[0069] The pressure relief component 1124 is designed as a detachable assembly. It connects to the pressure relief hole 1122 via threads or other fastening methods, ensuring a secure seal while facilitating disassembly and maintenance. The pressure relief component 1124 is typically made of a high-strength, corrosion-resistant alloy, capable of withstanding pressure variations in complex environments.

[0070] Furthermore, the pressure relief component 1124 is fixed to the pressure relief hole 1122 by a threaded connection and is provided with a sealing gasket to ensure the sealing effect of the pressure relief hole 1122 during normal operation and to prevent external substances from entering.

[0071] Under high temperature and high pressure conditions, the gas expansion inside the electronic chamber 1022 will cause the pressure to rise. The pressure relief hole 1122 provides a pressure release channel, which effectively avoids damage to internal components due to overpressure, and also prevents the shell from deforming or the weld from cracking due to internal air pressure difference, thus extending the service life of the sensor.

[0072] Under normal conditions, the pressure relief component 1124 provides sealing protection to prevent external substances from entering the sensor and maintain the explosion-proof performance of the electronic compartment 1022.

[0073] In some embodiments, optionally, such as Figure 2 As shown, the first seal 1126 is located between the pressure relief hole 1122 and the pressure relief component 1124. It can be fixed in the reserved groove on the inner wall of the pressure relief hole 1122 by embedding or press-fitting, forming a tight fit with the outer wall of the pressure relief component 1124. Under normal operating conditions, the first seal 1126 effectively prevents minor leakage between the pressure relief hole 1122 and the pressure relief component 1124, while ensuring unobstructed and safe passage under pressure relief conditions.

[0074] Furthermore, the first seal 1126 is a ring-shaped design, typically made of high-temperature and corrosion-resistant materials (such as fluororubber, PTFE, etc.) to adapt to high-pressure and high-temperature operating conditions in complex environments. The first seal 1126 is designed as a sealing ring that is in close contact with the inner wall of the pressure relief hole 1122 and the outer wall of the pressure relief component 1124, providing a stable sealing effect.

[0075] In some embodiments, optionally, such as Figure 1 As shown, the waterproof connector 114 is mainly used to fix the cable 1142 and prevent moisture or dust from entering the housing structure 1082, ensuring the reliable operation of the sensor in humid, dusty or potentially explosive environments.

[0076] A waterproof connector 114 is radially arranged on the housing structure 1082 along the flange plate 102, making the cable 1142 lead-out direction more flexible, reducing restrictions on installation space, and facilitating equipment wiring optimization. One end of the cable 1142 passes through the waterproof connector 114 and is electrically connected to the signal board 104, preventing moisture, dust, or corrosive gases from entering the housing structure 1082 through the cable 1142 inlet, thereby improving the sensor's sealing level, providing safety protection in explosion-proof environments, and avoiding potential safety hazards caused by the entry of external gases.

[0077] The cable 1142 is securely fixed by the built-in fastening mechanism of the waterproof connector 114, preventing the cable from loosening or falling off due to vibration or external force.

[0078] Furthermore, the waterproof connector 114 has a threaded structure, and its outer shell is typically made of corrosion-resistant metal (such as stainless steel) or high-strength plastic, with an internal sealing ring. The waterproof connector 114 is designed with an adjustable structure to accommodate cables 1142 of different specifications and ensures excellent waterproof performance after fixing. The connection between the waterproof connector 114 and the outer shell structure 1082 uses a threaded design with a sealing ring to ensure interface sealing and further enhance the overall waterproof and dustproof capabilities of the sensor.

[0079] In some embodiments, optionally, such as Figure 4 As shown, the hollow structure 1034 includes a connecting hole 1036 and a positioning hole 1038. The connecting hole 1036 is an elongated hole penetrating the flange plate 102, with its two ends connected to the positioning hole 1038 and the receiving cavity 1032, respectively. The diameter of the connecting hole 1036 is designed to be smaller than the diameter of the positioning hole 1038, forming a transition structure with a gradually increasing aperture. One end of the connecting hole 1036 is connected to the positioning hole 1038, and the other end is connected to the receiving cavity 1032, serving to provide a guiding path for the measuring rod structure 106 and connect the signal transmission channel.

[0080] The positioning hole 1038 is located inside the hollow structure 1034 of the flange plate 102, and its inner diameter is larger than that of the connecting hole 1036, forming a three-dimensional support structure. The bottom of the positioning hole 1038 provides a support contact surface for the measuring rod structure 106, ensuring the stability of the measuring rod structure 106.

[0081] One end of the measuring rod structure 106 abuts against the bottom of the positioning hole 1038, ensuring the precise positioning and stable assembly of the measuring rod structure 106 through its supporting function. The bottom of the positioning hole 1038 provides a stable support surface for the measuring rod structure 106, ensuring the accuracy of its installation position and improving the assembly quality.

[0082] It is understandable that the connecting hole 1036 and the positioning hole 1038 together form a stepped hole structure.

[0083] In some embodiments, optionally, such as Figure 2 As shown, providing at least one of the insulating cover 116 and the shielding cover 118 provides more comprehensive protection and functional optimization for the sensitive component 1042. Specifically, the insulating cover 116 prevents signal interference and short circuits through electrical isolation; the shielding cover 118 ensures the accuracy of signal transmission by shielding against external electromagnetic interference.

[0084] The insulating cover 116 is a structure adapted to the shape of the receiving cavity 1032, made of insulating material, and can completely enclose the sensitive component 1042. Its shape fits tightly to the receiving cavity 1032, forming a stable protective layer. The insulating cover 116 is installed inside the receiving cavity 1032, and the sensitive component 1042 is embedded in the insulating cover 116 and fixed by fitting it to the receiving cavity 1032.

[0085] The shielding cover 118 is also adapted to the shape of the receiving cavity 1032 and is typically made of a highly conductive metal material, providing electromagnetic shielding. The shielding cover 118 completely encloses the sensitive component 1042, providing it with multiple layers of protection. The shielding cover 118 is installed within the receiving cavity 1032, tightly integrated with both the cavity and the sensitive component 1042, and stably connected via fixed points or an embedded method. It blocks external electromagnetic interference, ensuring the accuracy of signal transmission from the sensitive component 1042, with particularly significant performance in high electromagnetic interference environments.

[0086] Insulating cover 116 can be used alone to provide electrical isolation and is suitable for environments where electromagnetic interference requirements are not high.

[0087] The shield 118 can be used alone to provide electromagnetic shielding and is suitable for high-interference environments, but requires other components to provide electrical isolation support.

[0088] When used together, the insulating cover 116 and the shielding cover 118 provide electrical isolation and electromagnetic shielding functions, respectively, which are suitable for high-precision measurement needs under complex working conditions.

[0089] In some embodiments, optionally, the end cap 120 provides additional protection for the probe structure 106, ensuring that the end of the probe away from the signal board 104 is not damaged during use. Furthermore, by providing the extension thread 1202, when the probe structure 106 is too long, an auxiliary component can be added to help keep the probe structure 106 concentric.

[0090] In some embodiments, one end of the probe structure 106 is optionally fixed to the flange plate 102 by welding, so that the base end of the probe structure 106 is firmly connected to the flange plate 102. In addition, the other end of the probe structure 106 is fixedly connected to the end cap 120 by welding, so as to ensure reliable mechanical support between the end cap 120 and the probe structure 106.

[0091] The probe structure 106 penetrates the hollow structure 1034 of the positioning shaft structure 1024 and is adapted to the positioning hole 1038 to sense the displacement of the piston inside the hydraulic cylinder. Both ends of the probe structure 106 are welded and fixed to the flange plate 102 and the end cap 120, respectively. The probe structure 106 is firmly connected to the flange plate 102 by welding, ensuring that the probe structure 106 maintains a stable installation position during the movement of the hydraulic cylinder and will not shift due to vibration or pressure changes. The probe structure 106 is connected to the end cap 120 by welding, ensuring that the end of the probe structure 106 is protected and that the end cap 120 can achieve special functions (such as extension, sealing, or specific mechanical contact).

[0092] In some embodiments, optionally, such as Figure 2 and Figure 3 As shown, a grounding hole 1222 and a grounding element 1224 are provided to offer necessary grounding protection for the displacement sensor 100, ensuring safe operation of the equipment in high-voltage or electromagnetic interference environments. The grounding hole 1222 is located on the flange plate 102, and is threadedly connected to the grounding element 1224, ensuring that the grounding element 1224 is securely mounted on the flange plate 102. The cooperation between the grounding hole 1222 and the grounding element 1224 allows the sensor to effectively establish a grounding connection with external equipment through the grounding element 1224, preventing equipment damage due to static electricity buildup or electromagnetic interference, providing a necessary electrical grounding path, and ensuring that the sensor system will not cause safety hazards or circuit failures when operating in high-voltage environments.

[0093] Of course, the design of the grounding hole 1222 and the grounding element 1224 can effectively reduce electromagnetic interference (EMI) and ensure the accuracy and stability of the sensor output signal.

[0094] Furthermore, the threaded connection between the grounding component 1224 and the grounding hole 1222 is typically made of metal to ensure good conductivity. The grounding component 1224 is designed to fit tightly with the grounding hole 1222 of the flange plate 102, forming a robust grounding connection.

[0095] In some embodiments, optionally, such as Figure 1 and Figure 4 As shown, a sealing groove 1242 and a second sealing element 1244 are provided to further improve the sealing performance of the device, ensure effective sealing between the positioning shaft structure 1024 and the external environment, prevent dust, moisture or other harmful substances from entering the device, and improve the durability and long-term stability of the sensor.

[0096] A sealing groove 1242 is provided on the outer wall of the positioning shaft structure 1024, and is usually distributed along the axial direction to accommodate the second seal 1244. The sealing groove 1242 cooperates with the second seal 1244, and the space in the groove stabilizes the position of the second seal 1244, forming a sealed connection.

[0097] The second seal 1244 is fitted outside the positioning shaft structure 1024 and is typically made of rubber, silicone, or other materials with good sealing properties. The second seal 1244 cooperates with the sealing groove 1242 to provide excellent sealing and prevent the penetration of external substances.

[0098] By employing a positioning shaft structure 1024 with a sealing groove 1242 and a second seal 1244 fitted therein, this design ensures an effective seal between the positioning shaft structure 1024 and the external environment. The sealing groove 1242 provides precise positioning for the second seal 1244, enabling it to provide excellent sealing performance, preventing contaminants, moisture, etc., from entering the device, thereby improving the sensor's protection performance and reliability.

[0099] In some embodiments, optionally, such as Figure 1 As shown, the magnetic ring 126 and the non-magnetic pad 128 enhance the effectiveness of the sensor in magnetic signal transmission and effectively isolate the influence between the magnetic ring 126 and the installed object, ensuring the accurate measurement of the position sensing element 1062 and the long-term stability of the equipment. Specifically, the magnetic ring 126 is sleeved on the outside of the measuring rod structure 106 and is usually designed as a ring with a built-in or embedded magnetic core to enhance the transmission efficiency of the magnetic signal. The material of the magnetic ring 126 is usually a magnetic alloy or other materials with good magnetic conductivity to ensure the generation and transmission efficiency of the magnetic field.

[0100] The magnetic ring 126 and the position sensing element 1062 transmit signals via a magnetic field. The position sensing element 1062 senses changes in the magnetic field and converts them into electrical signals. The function of the magnetic ring 126 is to effectively transmit the magnetic signal to the position sensing element 1062 through its built-in magnetic field, ensuring accurate displacement sensing. Stable magnetic field transmission ensures that the position sensing element 1062 can obtain accurate position signals, thereby improving the accuracy and response speed of displacement measurement.

[0101] A non-magnetic gasket 128 is located at the end of the magnetic ring 126 away from the flange plate 102. It is typically made of a non-magnetic material, such as plastic, rubber, or other non-magnetic materials. The function of the non-magnetic gasket 128 is to act as an isolation layer to prevent the magnetic ring 126 from directly contacting other metals or magnetic objects, thus ensuring the normal propagation of the magnetic field.

[0102] The non-magnetic pad 128 effectively isolates the magnetic ring 126 from direct contact with the object being installed, preventing magnetic materials from causing uneven magnetic fields or affecting signal transmission.

[0103] Of course, by using non-magnetic materials, the non-magnetic pad 128 ensures the stability of the magnetic field, avoids interference caused by metals or other magnetic objects, and guarantees the measurement accuracy of the sensor.

[0104] This application also provides an embodiment of an explosion-proof displacement sensor based on the magnetostrictive principle. The sensor mainly includes an explosion-proof electronic housing (i.e., electronic housing 1022), a flange mounting base, a pressure relief screw, an explosion-proof connector, a sensitive component 1042, an explosion-proof measuring rod (i.e., measuring rod structure 106), an end cap 120, and a magnetic ring 126. This application adopts a tight-fitting flange mounting method, which has advantages such as high connection strength, convenient disassembly, high-precision measurement, high-stability data output, maintenance-free operation, and suitability for use with U-shaped and confined hydraulic cylinders. It can be applied to the environmental monitoring fields of Zone 1 and Zone 2 containing Class II explosive gases.

[0105] The main components of the explosion-proof displacement sensor based on the magnetostrictive principle include: a shell structure 1082, which can be an explosion-proof electronic compartment shell; a pressure relief component 1124, which can be a pressure relief screw; a grounding component 1224, which can be a grounding screw; a waterproof connector 114, which can be an explosion-proof waterproof connector; a flange plate 102, which can be a flange mounting base; a second sealing component 1244, which can be an O-ring; a magnetic ring 126, which can be a ring magnet; a non-magnetic gasket 128; a measuring rod structure 106, which can be an explosion-proof measuring rod; and an end cap 120. The internal components of the explosion-proof displacement sensor 100 based on the magnetostrictive principle include nine main components: a first sealing element 1126 (which can be a pressure relief screw gasket), a top cover structure 1086 (which can be an explosion-proof electronic compartment top cover), a clamping screw 130 (which can be an internal grounding clamping screw), a signal board 104, a shielding cover 118 (which can be an electronic compartment shielding cover), an insulating cover 116 (which can be an electronic compartment insulating cover), a sensitive element bracket, a sensitive component 1042, and a position sensing element 1062.

[0106] The internal and external structures are designed based on the principles of easy installation, disassembly, maintenance, full enclosure, and explosion protection.

[0107] Furthermore, an explosion-proof displacement sensor 100 based on the magnetostrictive principle mainly comprises four components: an electronic housing 1022, a sensing component 1042, a measuring rod structure 106, and a magnetic ring 126. The electronic housing 1022 has pressure relief screws on its outer shell and a positioning shaft (i.e., positioning shaft structure 1024) to ensure concentricity during assembly. The electronic housing 1022 has multiple through holes (i.e., connection holes 1026) for connection to equipment. It also has threaded holes for electrical grounding, and the cable outlet is located circumferentially to reduce installation space limitations. The measuring rod structure 106 has an extension thread 1202 at its tail. This extension thread 1202 can be internal, used to add auxiliary components to help maintain concentricity when the measuring rod is too long.

[0108] The functions of each component are as follows: The explosion-proof electronic housing shell protects the internal electrical components and circuits. The pressure relief component 1124 releases gas from the electronic housing in high-temperature environments, ensuring stable internal and external air pressure. The grounding component 1224 grounds the sensor to the outside, protecting the internal circuitry. The waterproof connector 114 secures the cable in potentially explosive environments. The flange plate 102 secures the measuring rod and electronic housing, and is used for product connection and fixation. The second seal 1244 seals the sensor during assembly with the mounting component. The magnetic ring 126 contains a magnetic core, transmitting magnetic signals to the position sensing element. The non-magnetic gasket isolates the ring magnet from the mounting contact surface. The measuring rod structure 106 protects the position sensing element 1062 and limits the movement of the magnetic ring 126, such as the ring magnet. The end cap 120 is welded to the end of the measuring rod, sealing the rod and protecting internal components; it also has internal threads for fixing to the mounting component. The first seal 1126 seals the pressure relief screw assembly. The top cover structure 1086 seals the electronic housing, protecting the internal components. The clamping screw 130 is used to connect the internal circuitry to the housing. The signal board 104 is used to process and output the electrical signals converted from the sensitive element. The shielding cover 118 is used to isolate other signal interference. The insulating cover 116 is used to insulate the sensitive component 1042 from the housing. The sensitive element bracket is used to fix the sensitive component 1042 and the signal board 104. The sensitive component 1042 is used to receive the signals transmitted by the position sensing element 1062 and convert them into electrical signals. The position sensing element 1062 senses the position of the magnetic ring 126 and transmits the signal to the sensitive component 1042. The housing structure 1082 is fixed to the flange plate 102 by welding. The measuring rod structure 106 is fixed to the flange plate 102 by welding. The measuring rod structure 106 is fixed to the end cap 120 by welding. The top cover structure 1086 is fixed to the housing structure 1082 by welding. The flange plate 102 is equipped with a clamping flange mount and an O-ring groove. Flange plate 102 has one through hole every 60 degrees, for a total of 6 through holes, for mounting bolts. When installed on the equipment, the sensor's output position can be adjusted by rotating it 60 degrees to meet the electrical connection requirements of the equipment.

[0109] The threaded holes of flange plate 102 are used to install grounding component 1224. The mounting groove of flange plate 102 is designed to match the external dimensions of insulating cover 116, which can effectively protect internal sensitive components and signal boards.

[0110] The positioning groove of the flange plate 102 is used for the installation and positioning of the electronic compartment 1022, which facilitates the welding of the electronic compartment 1022 to the flange plate 102.

[0111] The O-ring groove of flange plate 102 is used to install O-ring seals.

[0112] The positioning shaft of flange plate 102 is used for compression sealing and positioning during sensor and equipment assembly.

[0113] The stepped holes in the flange plate 102 are used for the assembly and positioning of the explosion-proof measuring rod, which facilitates the welding of the measuring rod structure 106 to the flange plate 102.

[0114] This embodiment has the following significant advantages: It features a tight-fitting sealing flange installation with six evenly distributed through-hole mounting bolts and O-ring seals, ensuring even stress distribution during assembly and facilitating disassembly and maintenance; the explosion-proof electronic compartment is welded to the explosion-proof electronic compartment cover and flange mounting base, forming a fully enclosed electronic compartment with a maximum IP68 protection rating; the main structural components—electronic compartment, cover, and base—meet explosion-proof design requirements and can be used in explosion-proof environments; different functional output modes can be achieved by modifying the internal program, enabling multi-functional integrated signal acquisition; and continuous non-contact measurement of positions eliminates mechanical wear, extending the sensor's lifespan.

[0115] In this utility model, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance; the term "multiple" refers to two or more unless otherwise explicitly defined. The terms "install," "connect," "join," and "fix" should be interpreted broadly. For example, "connect" can be a fixed connection, a detachable connection, or an integral connection; "join" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0116] In the description of this utility model, it should be understood that the terms "upper", "lower", "left", "right", "front", "rear", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or unit referred to must have a specific orientation or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0117] In the description of this specification, the terms "one embodiment," "some embodiments," "specific embodiment," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0118] The above are merely preferred embodiments of this utility model and are not intended to limit the scope of this utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. A displacement sensor, characterized in that, include: A flange plate, one end of which is provided with an electronic compartment, and the other end of which is provided with a positioning shaft structure. The electronic compartment is provided with a receiving cavity, and the positioning shaft structure is provided with a hollow structure. The receiving cavity is connected to the hollow structure. The flange plate is provided with multiple connection holes for connecting and installing objects. The outer shell structure is welded to one end of the flange plate where the electronic compartment is located, and the electronic compartment is located inside the outer shell structure; The measuring rod structure is adapted to the hollow structure, and the measuring rod structure is welded to one end of the flange plate where the positioning shaft structure is located; A signal board and a sensitive component electrically connected to the signal board, the sensitive component including a position sensing element, the signal board being disposed within the receiving cavity, and the position sensing element being disposed within the measuring rod structure; The flange plate, the electronic compartment, and the positioning shaft structure are integrated into one unit.

2. The displacement sensor according to claim 1, characterized in that, Also includes: A positioning groove is provided at the end of the flange plate where the electronic compartment is located; The outer shell structure is welded to the positioning groove.

3. The displacement sensor according to claim 1, characterized in that, The outer shell structure has a mounting port at one end away from the flange plate, and the signal board and the sensitive component extend into the receiving cavity and the hollow structure through the mounting port; The displacement sensor further includes a top cover structure for connecting to the mounting port when the signal plate and the sensitive component are located within the receiving cavity and the hollow structure.

4. The displacement sensor according to claim 1, characterized in that, Also includes: A pressure relief hole is provided on the outer casing structure, and the pressure relief hole extends radially along the flange plate; The pressure relief component is detachably connected to the pressure relief hole.

5. The displacement sensor according to claim 4, characterized in that, Also includes: A first sealing element is disposed between the pressure relief hole and the pressure relief element.

6. The displacement sensor according to claim 1, characterized in that, The hollow structure includes a connecting hole and a positioning hole. The two ends of the connecting hole are connected to the positioning hole and the receiving cavity, respectively. The diameter of the connecting hole is smaller than the diameter of the positioning hole. One end of the measuring rod structure abuts against the bottom of the positioning hole.

7. The displacement sensor according to claim 1, characterized in that, Also includes: An insulating cover is adapted to the shape of the receiving cavity, and the sensitive component is disposed inside the insulating cover; and / or A shield is adapted to the shape of the receiving cavity, and the sensitive component is disposed inside the shield.

8. The displacement sensor according to any one of claims 1 to 7, characterized in that, Also includes: A grounding hole is provided on the flange plate; The grounding component is threadedly connected to the grounding hole.

9. The displacement sensor according to any one of claims 1 to 7, characterized in that, include: A sealing groove is provided on the outer wall of the positioning shaft structure; The second sealing element is provided corresponding to the sealing groove and is sleeved on the outside of the positioning shaft structure.

10. The displacement sensor according to any one of claims 1 to 7, characterized in that, include: A magnetic ring is fitted over the probe structure and is used to transmit magnetic signals to the position sensing element. A non-magnetic gasket is disposed at the end of the magnetic ring away from the flange plate, and the non-magnetic gasket is used to isolate the magnetic ring and the mounting object.

Images