Displacement sensor

Abstract

The utility model discloses a displacement sensor, and relates to the technical field of sensors. The displacement sensor comprises a protection tube which is provided with a first port and a mounting cavity; the mounting cavity extends from the end face of the first port in the axial direction of the protection tube; the mounting cavity comprises an electronic cavity and a test cavity; the supporting tube is sleeved in the testing cavity, and a step surface is formed between the supporting tube and the electronic cavity; the supporting pipe is provided with a through hole; the first sealing element is arranged at the first port so as to block the mounting cavity; the core body assembly is arranged in the electronic cavity and abuts against the step surface; the magnetic induction element is positioned in the through hole and is electrically connected with the core body assembly; and the magnetic ring is sleeved outside the protection tube and can slide along the extension direction of the magnetic induction element so as to form non-contact magnetic coupling with the magnetic induction element. The displacement sensor can be installed in a narrow space, is stable in overall design, and is suitable for places with high space requirements.

Description

Technical Field

[0001] This application relates to the field of sensor technology, specifically to a displacement sensor. Background Technology

[0002] Magnetostrictive displacement sensors use internal non-contact measurement and control technology to accurately detect the absolute position of a moving magnetic ring to measure the actual displacement value of the product being tested. Since the moving magnetic ring, which determines the position, and the sensing element do not have direct contact, the sensor can be used in extremely harsh industrial environments and is widely used to measure linear displacement.

[0003] A magnetostrictive displacement sensor mainly consists of an electronic housing, a measuring rod, and a non-contact magnetic ring fitted onto the measuring rod. Magnetostrictive displacement sensors typically require regular maintenance to ensure their measurement accuracy.

[0004] However, in actual use, when the external space is limited, the magnetostrictive displacement sensor is difficult to disassemble during maintenance, making maintenance inconvenient. Frequent maintenance can also cause wear on the port seals, which in turn affects the service life of the internal components. Utility Model Content

[0005] The purpose of this application is to provide a displacement sensor that can solve the problem of difficulty in maintenance when the external space is limited.

[0006] This application discloses a displacement sensor comprising: a protective tube having a first port and a mounting cavity; the mounting cavity extending axially from the end face of the first port along the protective tube; the mounting cavity including an electronic cavity and a test cavity; a support tube sleeved within the test cavity, forming a stepped surface between the support tube and the electronic cavity; and the support tube having a through hole; a first sealing element disposed at the first port to seal the mounting cavity; a core assembly disposed within the electronic cavity and abutting against the stepped surface; a magnetic induction element located within the through hole and electrically connected to the core assembly; and a magnetic ring sleeved outside the protective tube, capable of sliding along the extension direction of the magnetic induction element to form a non-contact magnetic coupling with the magnetic induction element. This displacement sensor can be installed in confined spaces, has a stable overall design, and is suitable for locations with high space requirements.

[0007] In some technical solutions, the protective tube may optionally include a second port; the mounting cavity extends through the end face of the second port; the displacement sensor may also include a second seal, disposed at the second port, to seal the mounting cavity.

[0008] In some technical solutions, optionally, the second seal is at least partially located outside the protective tube, and a wear-resistant ring is provided on the outer wall of the portion of the second seal located outside the protective tube.

[0009] Specifically, the second sealing member is provided with a mounting groove on the outer side wall of the part outside the protection tube, and the wear-resistant ring is arranged in the mounting groove. The embedded design can play a role in installation and positioning, and can also prevent the wear-resistant ring from deviating during work.

[0010] In some technical solutions, optionally, the magnetic induction element comprises a metal hose. The metal hose can be flexibly bent, so that when the installation position of the displacement sensor is limited in the outer space (that is, in a narrow space), the metal hose can flexibly adjust the direction and bypass the obstacles, greatly improving the installation convenience, thereby effectively solving the problem that the displacement sensor is not easy to disassemble when the outer space is limited.

[0011] In some technical solutions, optionally, the core assembly comprises: a fixed base arranged in the installation cavity and connected with the magnetic induction element; an installation support arranged on the fixed base; a signal plate arranged on the installation support; and a power plate electrically connected with the signal plate.

[0012] In some technical solutions, optionally, the displacement sensor further comprises a shielding cover arranged in the electronic cavity; one end of the shielding cover is connected with the fixed base, the other end is connected with the power plate, and the installation support and the signal plate are covered. The shielding cover can effectively block the interference of the external electromagnetic field, thereby ensuring the normal work of the internal circuit.

[0013] In some technical solutions, the displacement sensor further comprises: a cable, one end of the cable is connected with the core assembly through the first sealing member. In this way, the sealing failure caused by the user's on-site wiring can be avoided.

[0014] In some technical solutions, the displacement sensor further comprises: a wiring plug arranged outside the protection tube and connected with the other end of the cable. In the above technical solution, the external device is connected through the wiring plug, supporting plug and play, and facilitating installation.

[0015] In some technical solutions, the displacement sensor further comprises a compression nut sleeved outside the cable; the compression nut is threadedly connected with the first port and abuts against the first sealing member. In this way, the core assembly can be fixed in the protection tube.

[0016] In some technical solutions, the displacement sensor further comprises a compression ring sleeved outside the cable and located between the first sealing member and the compression nut. In this way, the first sealing member can be prevented from rotating the cable after being stressed during installation, causing the cable to be separated from the core assembly. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 is one of the structure schematic diagrams of the displacement sensor in the embodiments of the present application;

[0018] Figure 2 is a structural schematic diagram of a displacement sensor in an embodiment of the present application;

[0019] Figure 3 is a structural schematic diagram of a displacement sensor in an embodiment of the present application.

[0020] wherein, Figures 1 to 3 The correspondence between the reference signs and the component names in the drawings is as follows:

[0021] 100 protective tube; 110 first port; 120 mounting cavity; 121 electronic cavity; 122 test cavity; 113 sealing ring; 114 stop ring; 130 second port; 140 support tube; 141 stepped surface; 142 through hole; 200 first sealing element; 300 second sealing element; 310 wear-resistant ring; 320 mounting groove; 400 core assembly; 410 fixed base; 420 mounting bracket; 430 signal board; 440 power supply board; 500 magnetic induction element; 600 magnetic ring; 700 shielding cover; 810 cable; 820 wiring plug; 910 compression nut; 920 compression ring. DETAILED DESCRIPTION

[0022] The technical solutions in the embodiments of the present application will be clearly described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art belong to the scope of protection of the present application.

[0023] The terms "first", "second", and the like in the specification and claims of the present application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described herein, and the objects distinguished by "first", "second", etc. are generally of a kind and do not limit the number of objects, for example, the first object can be one or more. In addition, "and / or" in the specification and claims indicates at least one of the connected objects, and the character " / ", generally indicates that the front and rear associated objects are in an "or" relationship.

[0024] The displacement sensor provided by the embodiments of the present application will be described in detail below with reference to the drawings and specific embodiments and application scenarios.

[0025] Referring to Figure 1 , Figure 2 and Figure 3Some embodiments of the present application disclose a displacement sensor, which comprises a protection tube 100, a first sealing member 200, a core assembly 400, a magnetic induction element 500 and a magnetic ring 600.

[0026] Specifically, referring to Figure 2 , the protection tube 100 has a first port 110 and a mounting cavity 120; the mounting cavity 120 extends along the axial direction of the protection tube 100 (as indicated by direction A in FIG. 1) from the end face of the first port 110; the mounting cavity 120 comprises an electronic cavity 121 and a test cavity 122 which are in communication with each other. Figure 2

[0027] The support tube 140 is sleeved in the test cavity 122 and forms a stepped surface 141 between the electronic cavity 121. The stepped surface 141 provides a mounting position for the core assembly 400, thereby forming axial limiting, so that the core assembly 400 can be in the same position each time it is installed. The support tube 140 is provided with a through hole 142 for mounting the magnetic induction element 500, which facilitates the overall disassembly.

[0028] The first sealing member 200 is arranged at the first port 110 to seal the mounting cavity 120. The first sealing member 200 seals the first port 110 of the protection tube 100, so that the mounting cavity 120 forms a closed mounting space, thereby providing a safe working space for the core assembly 400, effectively preventing dust, moisture, corrosive gas or liquid from the outside from entering the inside of the protection tube 100, to a great extent, protecting the electronic components inside the protection tube 100 (i.e. in the mounting cavity 120), ensuring the reliability and stability of the displacement sensor, which is conducive to prolonging the service life and reducing the maintenance frequency.

[0029] In actual application, the first sealing member 200 is an elastomer, which is a kind of material that can deform when subjected to external force and can return to its original shape after the external force is removed. It can produce a large elastic deformation under a small stress, so as to closely fit the surface of the first port 110, avoiding the existence of a small gap between the first port 110 and the first sealing member 200, thereby ensuring the reliability of the sealing. Exemplarily, the first sealing member 200 is a rubber ring, a polyurethane elastomer, a fluorine rubber, etc.

[0030] The core assembly 400 is arranged in the electronic cavity 121 and abuts against the stepped surface 141.

[0031] ​The magnetic sensing element 500 is located within the through hole 142 and is electrically connected to the core assembly 400. The magnetic sensing element 500 includes a flexible metal tube. The flexible metal tube allows the magnetic sensing element 500 to bend freely, thus effectively solving the problem of difficulty in assembling and disassembling the displacement sensor when the external space at the installation location is limited (i.e., in a confined space).

[0032] The magnetic ring 600 is fitted around the protective tube 100 and can extend along the direction of the magnetic induction element 500 (e.g., Figure 2 The magnetic ring 600 slides in the direction of A to form a non-contact magnetic coupling with the magnetic induction element 500. In this way, when the magnetic ring 600 moves on the protective tube 100, the magnetic induction element 500 will sense the position change of the magnetic ring 600 and output a corresponding induction signal to the core assembly 400, which will then process and output the signal.

[0033] In the above embodiments, when disassembly and assembly are required, the components inside the protective tube 100 can be disassembled and assembled simply by opening the first seal 200, which greatly improves the ease of installation and effectively solves the problem that the displacement sensor is difficult to disassemble and assemble when the external space is limited.

[0034] In some embodiments, the protective tube 100 further includes a second port 130, and the mounting cavity 120 extends through the end face of the second port 130. The displacement sensor also includes a second seal 300 disposed at the second port 130 to seal the mounting cavity 120.

[0035] In practical use, the second port 130 provides another disassembly point for the displacement sensor. When the displacement sensor needs to be disassembled, the operator can also operate from the second port 130, thus allowing for selection according to the actual environment and enhancing maintenance convenience.

[0036] In some embodiments, the second seal 300 is at least partially located outside the protective tube 100, and a wear-resistant ring 310 is provided on the outer wall of the portion of the second seal 300 located outside the protective tube 100. The external wear-resistant ring 310 can significantly extend the service life of the second seal 300, thereby protecting the internal components of the protective tube 100, helping to extend the service life of the displacement sensor, and reducing the number of maintenance operations.

[0037] In some embodiments, the second seal 300 has a mounting groove 320 on the outer wall of the portion of the protective tube 100, and the wear ring 310 is disposed within the mounting groove 320. This embedded design allows the mounting groove 320 to serve both as a positioning element and to prevent the wear ring 310 from shifting or falling off during operation.

[0038] In the above embodiment, by providing the wear-resistant ring 310 on the outer sidewall of the protection tube 100 where the second sealing element 300 is located, the friction loss of the second sealing element 300 can be significantly reduced, thereby prolonging the service life of the second sealing element 300 to ensure the safety of the internal components of the protection tube 100, thereby reducing the maintenance frequency.

[0039] In some embodiments, the magnetic induction element 500 adopts a metal hose, which can be flexibly bent. In this way, when the installation position of the displacement sensor is limited in space (i.e., in a narrow space), the metal hose can flexibly adjust the direction and bypass obstacles, greatly improving the installation convenience, thereby effectively solving the problem that the displacement sensor is not easy to disassemble when the external space is limited.

[0040] In some embodiments, the outer sidewall of the electronic cavity 121 is provided with a limiting groove, and a sealing assembly is arranged in the limiting groove. The sealing assembly includes a sealing ring 113 and a stop ring 114. Through the cooperation of the sealing ring 113 and the stop ring 114, the sealing ring 113 provides an initial sealing force, and the stop ring 114 axially presses the sealing ring 113 through a pre-tightening force to enhance the contact pressure of the sealing interface, while preventing the sealing ring 113 from being extruded under high pressure, thereby achieving high-pressure resistance sealing of the displacement sensor.

[0041] In some embodiments, referring to Figure 2 and Figure 3 , the core assembly 400 includes a fixed base 410, a mounting bracket 420, a signal board 430, and a power board 440.

[0042] Specifically, the fixed base 410 is arranged in the electronic cavity 121 and abuts against the stepped surface 141, and the fixed base 410 is connected and fixed with the magnetic induction element 500. The mounting bracket 420 is arranged on the fixed base 410, the signal board 430 and the power board 440 are arranged on the mounting bracket 420, and the power board 440 and the signal board 430 are electrically connected, for providing power for the signal board 430. In actual application, the components of the core assembly 400 can be disassembled, thereby facilitating maintenance.

[0043] In the above embodiment, the mounting bracket 420 includes an upper bracket and a lower bracket, the lower bracket is connected with the fixed base 410, and the upper bracket is connected with the lower bracket. The signal board 430 is arranged on one side of the lower bracket, and the power board 440 is arranged on the top of the upper bracket.

[0044] In some embodiments, the displacement sensor further comprises a shielding cover 700. The shielding cover 700 is arranged in the electronic cavity 121, one end of the shielding cover 700 is fixedly connected with the fixed base 410, and the shielding cover 700 covers the mounting bracket 420, the signal board 430 and the power supply board 440 to protect them. The shielding cover 700 can effectively block the interference of external electromagnetic fields, thereby ensuring the normal operation of the internal circuit and the stability of the output signal.

[0045] In actual application, the power supply board 440 and the other end of the shielding cover 700 are fixedly connected to block the shielding cover 700, thereby further improving the protection effect of the shielding cover 700.

[0046] In some embodiments, referring to Figure 1 and Figure 2 , the displacement sensor further comprises a cable 810, one end of the cable 810 passes through the first sealing member 200 and the core assembly 400. The displacement sensor is provided with the cable 810, i.e., the cable 810 is pre-installed, which on the one hand avoids damage to the sealing structure caused by user wiring, and on the other hand eliminates the risk of reduced sealing performance caused by differences in wiring process, thereby ensuring the long-term sealing stability of the sensor at the source.

[0047] In actual application, the displacement sensor 810 further comprises a wiring plug 820 arranged outside the protection tube 100 and connected with the other end of the cable 810. In this embodiment, the wiring plug 820 is connected with an external device to support plug and play, facilitate installation and greatly simplify the on-site installation process. In actual application, the wiring plug 820 adopts an aviation plug, and the protection level of the aviation plug can reach IP67 / IP69, which is suitable for harsh environments such as vibration, humidity and dust. It can be understood that the wiring plug 820 can also adopt a waterproof connector, a connector or other wiring structure according to specific application scenarios.

[0048] In some embodiments, the displacement sensor further comprises a compression nut 910 sleeved on the outer periphery of the cable 810, the compression nut 910 is threadedly connected with the first port 110 and abuts against the first sealing member 200. By adjusting the compression nut 910, the compression force of the first sealing member 200 can be adjusted, and then the compression force of the core assembly 400 can be adjusted, thereby stably fixing the core assembly 400 inside the protection tube 100. In order to facilitate operation, the axial end surface of the compression nut 910 is designed with symmetrically distributed holes, and these symmetric holes can be matched with special tools for disassembly and assembly, thereby greatly improving the convenience of installation and maintenance.

[0049] In the above embodiment, the displacement sensor further comprises a compression ring 920, which is sleeved on the outer periphery of the cable 810 and located between the first seal 200 and the compression nut 910. By arranging the compression ring 920, the cable 810 is fastened, which can prevent the first seal 200 from rotating the cable 810 after being stressed during installation, causing the cable 810 to be separated from the core assembly 400, thereby ensuring the reliability of the electrical connection.

[0050] It should be noted that, in this document, the terms "comprise", "comprising", or any other variant thereof are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements, but can also include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without more limitations, an element defined by the statement "comprising a" does not exclude the existence of additional identical elements in the process, method, article, or apparatus that includes the element. In addition, it should be pointed out that the scope of the methods and apparatus in the embodiments of the present application is not limited to performing functions in the order shown or discussed, but can also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method can be performed in an order different from that described, and various steps can also be added, omitted, or combined. In addition, the features described with reference to certain examples can be combined in other examples.

[0051] The embodiments of the present application are described above in combination with the drawings, but the present application is not limited to the above specific embodiments, which are only illustrative and not restrictive, and a person of ordinary skill in the art can make many forms under the inspiration of the present application without departing from the scope of the present application and the scope protected by the claims.

Claims

1. A displacement sensor, characterized in that, include: A protective tube has a first port and a mounting cavity; the mounting cavity extends axially from the end face of the first port along the protective tube. The mounting cavity includes an electronic cavity and a testing cavity; A support tube is fitted inside the test cavity and forms a stepped surface between it and the electronic cavity; the support tube has a through hole; A first sealing element is disposed at the first port to seal the mounting cavity; The core assembly is disposed within the electronic cavity and abuts against the stepped surface; A magnetic induction element is located inside the through hole and is electrically connected to the core assembly; A magnetic ring is fitted over the protective tube and can slide along the extension direction of the magnetic induction element to form a non-contact magnetic coupling with the magnetic induction element.

2. The displacement sensor according to claim 1, characterized in that, The displacement sensor also includes: A cable, one end of which passes through the first seal and is connected to the core assembly.

3. The displacement sensor according to claim 2, characterized in that, The displacement sensor also includes: A clamping nut is fitted over the cable; the clamping nut is threaded to the first port and abuts against the first seal.

4. The displacement sensor according to claim 3, characterized in that, The displacement sensor also includes a clamping ring, which is sleeved on the outer periphery of the cable and located between the first seal and the clamping nut.

5. The displacement sensor according to claim 2, characterized in that, The displacement sensor also includes: A connector is located outside the protective tube and is connected to the other end of the cable.

6. The displacement sensor according to claim 1, characterized in that, The protective tube also includes a second port; the mounting cavity extends through the end face of the second port; The displacement sensor also includes: A second seal is provided at the second port to seal the mounting cavity.

7. The displacement sensor according to claim 6, characterized in that, The second seal is at least partially located outside the protective tube, and a wear-resistant ring is provided on the outer wall of the portion of the second seal located outside the protective tube.

8. The displacement sensor according to claim 1, characterized in that, The magnetic sensing element includes a metal flexible tube.

9. The displacement sensor according to any one of claims 1 to 4, characterized in that, The core assembly includes: A fixed base is disposed within the electronic cavity and connected to the magnetic induction element; The mounting bracket is mounted on the fixed base; The signal board is mounted on the mounting bracket; The power board is electrically connected to the signal board.

10. The displacement sensor according to claim 9, characterized in that, The displacement sensor also includes a shielding cover, which is disposed inside the electronic cavity; one end of the shielding cover is connected to the fixed base, the other end is connected to the power board, and covers the mounting bracket and the signal board.

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