Detachable ceramic capacitive pressure sensor

Abstract

A detachable ceramic capacitance pressure sensor comprises a metal shell, an electrical connector arranged at the top of the metal shell, a ceramic capacitance pressure core arranged in the metal shell and a flexible circuit board arranged in the metal shell, and the flexible circuit board is electrically connected with the ceramic capacitance pressure core and the electrical connector. The positioning ring is pressed on the ceramic capacitor pressure core body, the electrical connector is positioned on the top of the metal shell by the cover cap, and the positioning ring and the cover cap are respectively and detachably connected with the metal shell. According to the utility model, the calibration test is carried out before the electrical connector is assembled, and the electrical connector is selected to be assembled according to the plugging requirement after the calibration test is qualified, so that the assembled product is ensured to meet the calibration requirement, the qualified rate of finished products is improved, the product parts are convenient to maintain and replace, the maintenance is convenient, and the service life of the product is prolonged; the maintenance cost is reduced.

Description

Technical Field

[0001] The utility model relates to a detachable ceramic capacitor pressure sensor, belonging to the technical field of ceramic capacitor pressure sensor assembly. Background Art

[0002] Ceramic capacitive pressure sensor is a common type of pressure sensor with the advantages of moderate cost, wide measuring range, good temperature characteristics, consistency, and long-term stability. It is widely used in the fields of automobile and industrial control. Its usual structure is that the metal shell and the electrical connector are riveted together. The ceramic capacitor is pressed by riveting force to deform the internal seal to generate sealing force to ensure the seal. When this structure is adopted, it is necessary to determine the type of electrical connector before riveting. For example, patent CN 115560885 discloses a ceramic capacitive pressure sensor, which is riveted into an internal cavity by the shell and the electrical connector. The cavity includes components such as pressure sensing elements, O-rings, and flexible circuit boards. This structure is a typical ceramic capacitive pressure sensor structure, but the product must be riveted before calibration and testing, and calibration and testing cannot be done without electrical connectors. In addition, during the production process, if the product has poor calibration and retesting, the product can only be scrapped and the parts cannot be disassembled and recycled. In the prior art, there are products with detachable structures. For example, patent CN 116429298 A discloses a detachable ceramic capacitor pressure sensor, in which the housing and the gland are connected by threads. During the tightening of the gland, the electrical connector, the pressure sensing element, and the circuit board are fastened in the opening of the housing. This solution allows the product to be disassembled without destroying the sensor structure, but calibration testing can only be performed after assembly. If the calibration fails, the product needs to be disassembled and replaced and recalibrated and tested after assembly, which affects the qualified rate of the assembled product. Moreover, once the gland needs to be loosened, the product needs to be recalibrated and tested, and the calibration test is repeated many times, which makes maintenance complicated. Utility Model Content

[0003] The detachable ceramic capacitor pressure sensor provided by the utility model can realize calibration test before assembling the electrical connector. After the calibration test is qualified, the electrical connector is selected for assembly according to the connection requirements, thereby ensuring that the assembled products meet the calibration requirements, improving the qualified rate of finished products, facilitating the maintenance and replacement of product parts, facilitating maintenance, extending the product life, and reducing maintenance costs.

[0004] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0005] A detachable ceramic capacitor pressure sensor comprises a metal shell, an electrical connector arranged on the top of the metal shell, a ceramic capacitor pressure core installed in the metal shell and a flexible circuit board installed in the metal shell, wherein the flexible circuit board is electrically connected to the ceramic capacitor pressure core and the electrical connector respectively, and is characterized in that it also comprises a positioning ring pressed on the ceramic capacitor pressure core and a cap for positioning the electrical connector on the top of the metal shell, wherein the positioning ring and the cap are detachably connected to the metal shell respectively.

[0006] Preferably, the inner cavity of the metal shell has an annular boss supporting the ceramic capacitor pressure core, the positioning ring is threaded into the inner cavity of the metal shell, the ceramic capacitor pressure core is clamped between the annular boss and the positioning ring, and the inner ring of the annular boss is sleeved with an O-ring in contact with the bottom surface of the ceramic capacitor pressure core.

[0007] Preferably, the top of the positioning ring is a hexagonal structure that can be matched with a hexagonal wrench.

[0008] Preferably, the electrical connector is placed on the positioning ring, the cover cap is threadedly screwed on the top of the metal shell to position the electrical connector, and the electrical connector extends upward through the cover cap.

[0009] Preferably, the electrical connector has an annular step surface that matches the cover cap, and the cover cap is screwed onto the top of the metal shell and abuts against the annular step surface.

[0010] Preferably, the upper end of the flexible circuit board is welded to the metal pin of the electrical connector, and the lower end is welded to the PIN pin on the pressure core of the ceramic capacitor.

[0011] The beneficial effects of the utility model are:

[0012] The utility model discloses a detachable ceramic capacitor pressure sensor, which uses a positioning ring to press the ceramic capacitor pressure core, installs the positioning ring and the ceramic capacitor pressure core on a metal shell, and electrically connects the flexible circuit board to the ceramic capacitor pressure core and to a measuring device, so that the product can be calibrated and tested, and the calibration test can be performed before the electrical connector is assembled, so as to avoid the assembly of products that fail the calibration test. After the calibration test is qualified, the electrical connector is selected according to the connection requirements for assembly, so as to avoid the calibration test after the product is assembled, and the calibration test of the product is adjusted from after the assembly to during the assembly process, so as to ensure that the assembled products meet the calibration requirements and improve the qualified rate of finished products; the cap and the positioning ring are both detachably connected to the metal shell, so as to realize the detachable assembly of the product, facilitate the maintenance and replacement of product parts, facilitate maintenance, extend the product life and reduce the maintenance cost; the positioning ring presses the ceramic capacitor pressure core so that the product does not need to be recalibrated and tested when only the electrical connector is disassembled, so as to improve the convenience of maintenance. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of a detachable ceramic capacitor pressure sensor in a specific implementation manner.

[0014] Figure 2 This is a schematic diagram of the assembly of the metal shell, ceramic capacitor pressure core and flexible circuit board.

[0015] Figure 3 A schematic diagram of a positioning ring. DETAILED DESCRIPTION

[0016] Combine the following Figures 1 to 3 The embodiments of the utility model are described in detail.

[0017] A detachable ceramic capacitor pressure sensor comprises a metal shell 1, an electrical connector 2 arranged on the top of the metal shell 1, a ceramic capacitor pressure core 3 installed in the metal shell and a flexible circuit board 4 installed in the metal shell 1, wherein the flexible circuit board 4 is electrically connected to the ceramic capacitor pressure core 3 and the electrical connector 4 respectively, and is characterized in that it also comprises a positioning ring 5 pressed on the ceramic capacitor pressure core 3 and a cap 6 for positioning the electrical connector 2 on the top of the metal shell 1, and the positioning ring 5 and the cap 6 are detachably connected to the metal shell 1 respectively.

[0018] The detachable ceramic capacitor pressure sensor described above uses a positioning ring 5 to press the ceramic capacitor pressure core 3, installs the positioning ring 5 and the ceramic capacitor pressure core 3 on the metal shell 1, and electrically connects the flexible circuit board 4 to the ceramic capacitor pressure core 3 and the measuring equipment to perform calibration test on the product, so as to realize calibration test before assembling the electrical connector 2, avoid assembling products that fail the calibration test, select the electrical connector 2 for assembly according to the plug-in requirements after the calibration test is qualified, avoid calibration test after product assembly, adjust the calibration test of the product from after assembly to during assembly, ensure that the assembled products meet the calibration requirements, and improve the qualified rate of finished products; the cap 6 and the positioning ring 5 are both detachably connected to the metal shell 1, realize detachable assembly of the product, facilitate maintenance and replacement of product parts, facilitate maintenance, extend product life, and reduce maintenance costs; the positioning ring 5 presses the ceramic capacitor pressure core 3 so that the product does not need to be recalibrated and tested when only the electrical connector 2 is disassembled, thereby improving the convenience of maintenance.

[0019] Among them, the inner cavity of the metal shell 1 has an annular boss 11 supporting the ceramic capacitor pressure core 3, the positioning ring 5 is screwed into the inner cavity 1 of the metal shell with threaded fit, the ceramic capacitor pressure core 3 is sandwiched between the annular boss 11 and the positioning ring 5, and the inner ring of the annular boss 11 is sleeved with an O-ring 12 in contact with the bottom surface of the ceramic capacitor pressure core 3. The positioning ring 5 has an external thread on the outer wall, and the inner wall of the metal shell 1 has an internal thread. The ceramic capacitor pressure core 3 is first placed on the annular boss 11, and then the positioning ring 5 is screwed in to press it against the ceramic capacitor pressure core 3. The ceramic capacitor pressure core 3 is pressed by the positioning ring 5. After the lower end of the flexible circuit board 4 is electrically connected to the ceramic capacitor pressure core 3, the measuring device is electrically connected to the upper end of the flexible circuit board 4, so that the flexible circuit board 4 can convert the pressure signal of the ceramic capacitor pressure core 3 and transmit it to the measuring device for calibration test. The calibration test of the product is completed before the electrical connector 2 is assembled, and the calibration test is performed during the product assembly process to ensure that the assembled products meet the calibration requirements.

[0020] The top of the positioning ring 5 is a hexagonal structure that can be matched with a hexagonal wrench, so that the hexagonal wrench can be matched with the positioning ring 5 to quickly screw in or out the positioning ring 5, thereby improving the convenience of assembling the positioning ring 5.

[0021] The electrical connector 2 is placed on the positioning ring 5, and the cap 6 is screwed on the top of the metal shell 4 to position the electrical connector 2, and the electrical connector 2 extends upward through the cap 6. The electrical connector is positioned by screwing the cap 6 on the metal shell 1, and the electrical connector 2 is conveniently positioned and easy to disassemble.

[0022] The electrical connector 2 has an annular step surface 21 that matches the cap 6, and the cap 6 is screwed on the top of the metal shell 1 to abut against the annular step surface 21. The top of the outer wall of the metal shell 1 has an external thread, and the inner wall of the cap 6 has an internal thread that matches the external thread. The cap 6 is screwed on the top of the metal shell 1 to position the electrical connector 2. The electrical connector 2 is supported on the positioning ring 5 and positioned by the cap 6. The electrical connector 2 is positioned on the top of the metal shell by the threaded match between the cap 6 and the metal shell 1. The electrical connector 2 is easy to position and easy to disassemble.

[0023] The upper end of the flexible circuit board 4 is welded to the metal pin 22 of the electrical connector 2, and the lower end is welded to the PIN pin 31 on the ceramic capacitor pressure core 3. The electrical connection structure of the flexible circuit board 4, the electrical connector 2 and the ceramic capacitor pressure core 3 is simple and easy to implement.

[0024] When in use, the bottom of the metal shell 1 is mechanically connected to the external device, and the medium flows into the metal shell 1 from the bottom to form pressure on the ceramic capacitor pressure core 3. The flexible circuit board 4 converts the pressure signal into a data signal and transmits it to the external display device through the data line plugged into the electrical connector 2 for data display.

[0025] The above is a complete description of the technical solutions of the embodiments of the utility model in combination with the accompanying drawings. It should be noted that the described embodiments are only part of the embodiments of the utility model. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the utility model.

Claims

1. A detachable ceramic capacitor pressure sensor, comprising a metal housing, an electrical connector disposed on the top of the metal housing, a ceramic capacitor pressure core mounted in the metal housing, and a flexible circuit board mounted in the metal housing, wherein the flexible circuit board is electrically connected to the ceramic capacitor pressure core and the electrical connector, respectively, and characterized in that: It also includes a positioning ring pressed on the ceramic capacitor pressure core and a cover cap for positioning the electrical connector on the top of the metal shell. The positioning ring and the cover cap are respectively detachably connected to the metal shell.

2. The detachable ceramic capacitor pressure sensor according to claim 1, characterized in that: The inner cavity of the metal shell is provided with an annular boss supporting the ceramic capacitor pressure core, the positioning ring is threadedly screwed into the inner cavity of the metal shell, the ceramic capacitor pressure core is clamped between the annular boss and the positioning ring, and the inner ring of the annular boss is sleeved with an O-ring in contact with the bottom surface of the ceramic capacitor pressure core.

3. The detachable ceramic capacitor pressure sensor according to claim 2, characterized in that: The top of the positioning ring is an inner hexagon structure that can be matched with a hexagonal wrench.

4. The detachable ceramic capacitor pressure sensor according to claim 2, characterized in that: The electrical connector is placed on the positioning ring, the cover cap is screwed on the top of the metal shell with threaded fit to position the electrical connector, and the electrical connector passes through the cover cap and extends upward.

5. The detachable ceramic capacitor pressure sensor according to claim 4, characterized in that: The electrical connector is provided with an annular step surface matched with the cover cap, and the cover cap is screwed on the top of the metal shell to abut against the annular step surface.

6. The detachable ceramic capacitor pressure sensor according to claim 1, characterized in that: The upper end of the flexible circuit board is welded to the metal pin of the electrical connector, and the lower end is welded to the PIN pin on the ceramic capacitor pressure core.

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