Pressure sensor core body with joint

Abstract

The utility model relates to the technical field of pressure sensors, in particular to a pressure sensor core with a connector, which comprises a sensitive material layer, a fusion material layer and a connector which are sequentially connected in a stacked manner, a pressure measuring circuit is etched on one side, opposite to the fusion material layer, of the sensitive material layer, and the pressure measuring circuit is connected with a core lead. An inner cavity is formed in the connecting body in the axial direction of the connecting body, the inner cavity communicates with the end, back on to the fusion material layer, of the connecting body, and a first thread, a hexagon nut and a connecting thread are sequentially arranged in the direction back on to the fusion material layer and in the circumferential direction of the outer wall of the connecting body. The connecting body is connected with the inner wall of a pressure sensor shell through a first thread and connected with a connecting end of equipment to be tested through a connecting thread, the sensitive material layer, the fusion material layer and the connecting body are connected in a stacked mode, the first thread is used for being connected with the shell, and the connecting thread is connected with the equipment end, so that a dual mechanical sealing barrier is formed.

Description

Technical Field

[0001] This application relates to the field of pressure sensor technology, and in particular to a pressure sensor core with a built-in connector. Background Technology

[0002] The pressure sensor core is the sensitive element of the pressure sensor that senses pressure. When measuring pressure, the pressure sensor core is connected to the pipeline under test. Current technology assembles the pressure sensor core onto a connector using a sealing ring or by welding. The connector has a threaded structure, and the connector with the pressure sensor core is assembled to the pipeline under test through the threaded structure, thus connecting the pressure sensor core to the device under test.

[0003] However, since minute leaks may occur during use, assembling the core and connector using the sealing ring is only suitable for applications where leakage of the tested fluid is not a concern. While laser welding is used to avoid the temperature effects on the core and significantly reduces the weld width when assembling the core and connector using welding, welding stress still exists. The slow release of this stress negatively impacts the core's performance. Utility Model Content

[0004] To address the aforementioned issues, this application provides a pressure sensor core with a built-in connector. By stacking and connecting a sensitive material layer, a fusion material layer, and a connector, and connecting it to the housing via a first thread and to the device end via a connecting thread, a double mechanical sealing barrier is formed.

[0005] To achieve the objectives of this application, the following technical solution is provided:

[0006] This application provides a pressure sensor core with a built-in connector, comprising a sensitive material layer, a fusion material layer, and a connector stacked sequentially. A pressure measurement circuit is etched on the side of the sensitive material layer facing away from the fusion material layer. The pressure measurement circuit is connected to a core lead wire. An inner cavity is formed along the axial direction of the connector body. The inner cavity communicates with the end of the connector body facing away from the fusion material layer. A first thread, a hexagonal nut, and a connecting thread are sequentially arranged along the direction facing away from the fusion material layer and circumferentially on the outer wall of the connector body. The connector body is connected to the inner wall of the pressure sensor housing through the first thread and to the connection end of the device under test through the connecting thread.

[0007] In one possible implementation, the connector includes a first connector body, the connecting thread includes a second thread, one end of the first connector body is connected to the fusion material layer, and the first thread, the hexagonal nut and the second thread are sequentially arranged circumferentially on the outer wall of the first connector body in a direction opposite to the fusion material layer, and the second thread matches the thread reserved at the connection end of the device under test.

[0008] In one possible implementation, the connector includes a second connector body and an extension connector. The connecting thread includes a third thread. One end of the second connector body is connected to the fusion material layer. A first thread and a hexagonal nut are sequentially arranged circumferentially on the outer wall of the second connector body in a direction opposite to the fusion material layer. The other end of the second connector body is welded to one end of the extension connector, and the welding point is located at the end of the hexagonal nut away from the first thread. The third thread is arranged circumferentially on the outer wall of the other end of the extension connector. The third thread matches the thread reserved at the connection end of the device under test.

[0009] In one possible implementation, the sensitive material layer, the fusion material layer, and the connector are press-fitted together in a press to achieve sequential stacking; the inner cavity of the first connector, the first thread, the hexagonal nut, and the second nut are all integrally formed, and the inner cavity of the second connector, the first nut, and the hexagonal nut are all integrally formed.

[0010] In one possible implementation, the sensitive material layer is constantan foil, the pressure measuring circuit is a Wheatstone bridge, the fusion material layer is an adhesive layer with insulating and connecting properties, and the connector is a stainless steel plate.

[0011] In one possible implementation, the distance between the first thread and the sensitive material layer ranges from 3 to 20 mm, and the distance between the hexagonal nut and the sensitive material layer ranges from 10 to 50 mm.

[0012] The pressure sensor core with integrated connector provided in this application forms a double mechanical seal barrier by stacking and connecting a sensitive material layer, a fusion material layer, and a connector, and connecting it to the housing via a first thread and to the device end via a connecting thread. Compared with the sealing ring solution in the prior art, this completely eliminates the risk of fluid leakage, can be applied to the detection of hazardous media, and also avoids the problem of the pressure sensor core performance being affected during the welding stress release process. Attached Figure Description

[0013] The accompanying drawings are provided to further understand this application and form part of the specification. They are used together with the embodiments of this application to explain this application and do not constitute a limitation thereof.

[0014] Figure 1 A cross-sectional view of a pressure sensor core with a built-in connector provided in an embodiment of this application;

[0015] Figure 2 A cross-sectional view of a pressure sensor core with a built-in connector provided in another embodiment of this application;

[0016] Illustration: 100, Sensitive material layer; 200, Fusion material layer; 310, First connector body; 311, First thread; 312, Hex nut; 313, Second thread; 320, Second connector body; 330, Extension connector; 331, Third thread; 340, Welding point; 350, Inner cavity; 400, Core lead wire. Detailed Implementation

[0017] To make the objectives, technical solutions, and advantages of this application clearer, the technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0018] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.

[0019] The terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature; in the description of this application, unless otherwise stated, "multiple" means two or more.

[0020] The technical solution of this application is described below with reference to the following embodiments.

[0021] This application provides a pressure sensor core with a built-in connector, comprising a sensitive material layer 100, a fusion material layer 200, and a connector stacked sequentially. The fusion material layer 200 connects the sensitive material layer 100 to the connector, and the connector connects the pressure sensor core to the pressure sensor housing and the connection end of the device under test.

[0022] The pressure sensor core example in this application is an MCS pressure sensor core. MCS (MetalsCoalesce System) is a novel pressure sensor manufacturing technology. MCS series pressure sensors produced using this technology feature high reliability, high stability, high accuracy, high burst pressure, low temperature drift, low time drift, and an all-metal structure. MCS technology not only breaks through existing international sensor manufacturing processes and opens up a new field of industrial sensor technology, but also achieves advanced performance levels.

[0023] In some embodiments, the linkage hydraulic press adopts a hydraulic drive principle, achieving synchronous pressurization through the linkage of multiple sets of oil cylinders. The sensitive material layer 100, the fusion material layer 200, and the connector are pressurized by the linkage hydraulic press to achieve a tight connection between the layers. The fusion material layer 200, located between the sensitive material layer 100 and the connector, serves both as an adhesive connection and as an insulating barrier. The pressure sensor core senses the pressure signal from the device under test and can convert the pressure signal into a usable output electrical signal according to a certain rule, which is then transmitted to the controller.

[0024] The sensitive material layer 100 has a pressure measurement circuit etched on the side facing away from the fusion material layer 200, and the pressure measurement circuit is connected to the core lead 400. For example, the sensitive material layer 100 is constantan foil, and the pressure measurement circuit is a Wheatstone bridge, which is led out to the core lead 400 by soldering.

[0025] The connector body has an inner cavity 350 along its axial direction, which communicates with one end of the connector body facing away from the fusion material layer 200. A first thread 311, a hexagonal nut 312, and a connecting thread are sequentially arranged along the direction facing away from the fusion material layer 200 and circumferentially on the outer wall of the connector body. This allows the connector body to be connected to the inner wall of the pressure sensor housing via the first thread 311 and to the connection end of the device under test via the connecting thread.

[0026] Figure 1 A cross-sectional view of a pressure sensor core with a built-in connector provided in an embodiment of this application, as shown below. Figure 1As shown, in some embodiments, the connector includes a first connector body 310, and the connecting thread includes a second thread 313. One end of the first connector body 310 is connected to the fusion material layer 200. A first thread 311, a hexagonal nut 312, and a second thread 313 are sequentially arranged along the direction opposite to the fusion material layer 200 and circumferentially on the outer wall of the first connector body 310. The second thread 313 matches the thread reserved at the connection end of the device under test. This allows the connector body to be connected to the inner wall of the pressure sensor housing via the first thread 311 and to the connection end of the device under test via the second thread 313.

[0027] Meanwhile, the hexagonal nut 312 provides a surface for the force of tools (such as wrenches), ensuring that the pressure sensor body does not twist during installation by applying torque evenly, thus avoiding damage to the internal sensitive elements due to torque. It also ensures that the free end face of the pressure sensor's connector body is tightly fitted to the mounting surface of the device under test, preventing loosening of the threads due to vibration.

[0028] Figure 2 A cross-sectional view of a pressure sensor core with a built-in connector provided in another embodiment of this application, as shown below. Figure 2 As shown, in some embodiments, the connector includes a second connector body 320 and an extension connector 330. The connecting thread includes a third thread 331. One end of the second connector body 320 is connected to the fusion material layer 200. A first thread 311 and a hexagonal nut 312 are sequentially arranged circumferentially on the outer wall of the connector body in a direction opposite to the fusion material layer 200. The other end of the connector body is welded to one end of the extension connector 330, and the welding point 340 is located on the end face of the hexagonal nut 312 away from the first thread 311. The third thread 331 is circumferentially arranged on the outer wall of the other end of the extension connector 330. The third thread 331 matches the thread reserved at the connection end of the device under test. This enables the first thread 311 to connect to the inner wall of the pressure sensor housing and to connect to the connection end of the device under test through the connecting thread.

[0029] Because the thread reserved at the connection end of the device under test does not match the second thread 313 of the first connector body 310, a second type of connector is provided, including a second connector body 320 and an extension connector 330. One end of the extension connector 330 is welded to the free end face of the hexagonal nut 312 of the second connector body 320. The third thread 331 at the other end of the extension connector 330 matches the thread reserved at the connection end of the device under test. Furthermore, because the weld is far from the sensitive material layer 100 of the pressure sensor and the hexagonal nut 312 has a long diameter and thick wall, the adverse effects of welding stress on the sensitive material layer 100 are reduced. This also allows the pressure sensor core of this embodiment to be compatible with devices under test having various connection end specifications. Meanwhile, the hex nut 312 can also provide a force-bearing surface for tools (such as wrenches), ensuring that the pressure sensor body does not twist during installation by applying torque evenly, avoiding damage to the internal sensitive elements due to torque, and ensuring that the free end face of the pressure sensor's connector body is tightly fitted with the mounting surface of the device under test, avoiding loosening of the threads due to vibration.

[0030] In some embodiments, the distance between the first thread and the sensitive material layer is in the range of 3-20 mm, and the distance between the hexagonal nut and the sensitive layer material is in the range of 10-50 mm. The hexagonal nut is provided within this range to reduce the adverse effects of welding stress at the welding point between the hexagonal nut and the extension connector on the circuit of the sensitive material layer.

[0031] In some embodiments, the sensitive material layer 100, the fusion material layer 200 and the connector are press-fitted together in a press machine to achieve sequential stacking connection; the inner cavity 350, the first thread 311, the hexagonal nut 312 and the second nut of the first connector 310 are all integrally formed, and the inner cavity 350, the first nut and the hexagonal nut 312 of the second connector are all integrally formed.

[0032] In some embodiments, if the second thread 313 of the first connector body 310 does not match the thread reserved at the connection end of the device under test, an extension connector 330 with a third thread 331 can be welded to the free end face of the first connector body 310.

[0033] In some embodiments, the fusion material layer 200 is an adhesive layer with insulating and connecting properties, for example, an adhesive layer made of insulating adhesive, which is a liquid or solid adhesive with good electrical insulating properties. It can be used for casting cable joints, impregnating motor, electrical appliance, and generator windings, as well as for sealing and insulating transformers, capacitors, or radio devices, and as a surface protective layer for electrical and electronic components. Because the adhesive does not contain volatile solvents, it does not leave pores due to solvent evaporation after solidification.

[0034] In some embodiments, the connector is a stainless steel plate, for example, 17-4PH stainless steel. 17-4PH stainless steel is a martensitic precipitation hardening stainless steel, equivalent to the Chinese grade: 0Cr17Ni4Cu4Nb, which is a high-strength, high-corrosion-resistant stainless steel alloy.

[0035] This application also provides a method for preparing a pressure sensor core with a built-in connector, including the following steps:

[0036] First, the heat-treated connector (example of connector is 17-4PH smooth stainless steel plate) is cleaned and roughened before use; the heat-treated sensitive material layer (example of sensitive material layer is constantan foil) is cleaned and roughened before use.

[0037] Then, the fusion material layer is laid on the connector, and the sensitive material layer is laid on the fusion material layer. The sequentially stacked sensitive material layer, fusion material layer and connector are placed in a tooling and pressurized in a hydraulic press to obtain a tightly bonded multilayer composite.

[0038] Next, photolithography is performed on the sensitive material layer of the multilayer composite to obtain a pressure measurement circuit such as a Wheatstone bridge, and the circuit of the Wheatstone bridge is led out to the core lead wire by welding.

[0039] Finally, the multi-layer composite is divided into several multi-layer composite units. The connector of each multi-layer composite unit is formed by a one-time forming process to form a first connector including a first thread, a hexagonal nut, a second thread and an inner cavity, or to form a second connector including a first thread, a hexagonal nut and an inner cavity. Then, an extension connector with an inner cavity and a third thread is made using a stainless steel plate, and the extension connector is welded to the free end of the second connector to finally produce the pressure sensor core with a self-connector provided in the embodiment of this application.

[0040] The beneficial effects achievable by the embodiments of this application are as follows: By integrating the sensitive material layer, the fusion material layer, and the connector into a single layered design, and connecting it to the housing via a first thread and to the device end via a connecting thread, a double mechanical seal barrier is formed. Compared to the sealing ring solution in the prior art, this completely eliminates the risk of fluid leakage, can be applied to the detection of hazardous media, and also avoids the problem of the pressure sensor core performance being affected during the welding stress release process.

[0041] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0042] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A pressure sensor core with a built-in connector, characterized in that, The device comprises a sensitive material layer, a fusion material layer, and a connector, which are stacked sequentially. A pressure measurement circuit is etched on the side of the sensitive material layer facing away from the fusion material layer. The pressure measurement circuit is connected to a core lead. An inner cavity is formed along the axial direction of the connector. The inner cavity communicates with the end of the connector facing away from the fusion material layer. A first thread, a hexagonal nut, and a connecting thread are sequentially arranged on the circumferential direction of the outer wall of the connector in the direction facing away from the fusion material layer. The connector is connected to the inner wall of the pressure sensor housing through the first thread and to the connection end of the device under test through the connecting thread.

2. The pressure sensor core with integrated connector according to claim 1, characterized in that, The connector includes a first connector body and a second thread. One end of the first connector body is connected to the fusion material layer. The first thread, the hexagonal nut, and the second thread are sequentially arranged circumferentially on the outer wall of the first connector body in a direction opposite to the fusion material layer. The second thread matches the thread reserved at the connection end of the device under test. The inner cavity of the first connector body, the first thread, the hexagonal nut, and the second thread are all integrally formed.

3. The pressure sensor core with integrated connector according to claim 1, characterized in that, The connector includes a second connector body and an extension connector. The connecting thread includes a third thread. One end of the second connector body is connected to the fusion material layer. A first thread and a hexagonal nut are sequentially arranged circumferentially on the outer wall of the second connector body in a direction opposite to the fusion material layer. The other end of the second connector body is welded to one end of the extension connector, and the welding point is located at the end of the hexagonal nut away from the first thread. The third thread is arranged circumferentially on the outer wall of the other end of the extension connector. The third thread matches the thread reserved at the connection end of the device under test. The inner cavity of the second connector body, the first thread, and the hexagonal nut are all integrally formed.

4. The pressure sensor core with integrated connector according to claim 2 or 3, characterized in that, The sensitive material layer, the fusion material layer, and the connector are press-fitted together in a press to achieve sequential stacking and connection.

5. The pressure sensor core with integrated connector according to claim 1, characterized in that, The sensitive material layer is constantan foil, the pressure measurement circuit is a Wheatstone bridge, the fusion material layer is an adhesive layer with insulating and connecting properties, and the connector is a stainless steel plate.

6. The pressure sensor core with integrated connector according to claim 3, characterized in that, The distance between the first thread and the sensitive material layer ranges from 3 to 20 mm, and the distance between the hexagonal nut and the sensitive material layer ranges from 10 to 50 mm.

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