Capacitive pressure sensor

Abstract

The utility model relates to the technical field of sensors, and discloses a capacitive pressure sensor comprising a main body, the cross section of the main body is ring-shaped, and the two ends of the main body are provided with ring-shaped recessed sealing grooves; the base plate mechanism comprises a first base body and a second base body, the first base body and the second base body are arranged at the two ends of the main body respectively, and the first base body and the second base body are in sealing fit with the main body; the sealing assembly comprises flanges, sealing rings and convex rings, the flanges are arranged on the inner walls of the bottoms of the two sealing grooves, the sealing rings are arranged in the sealing grooves, and the convex rings are arranged at the ends, close to the sealing grooves, of the first base body and the second base body. The first base body and the second base body are detachably mounted through structures such as a rotating ring and a clamping groove, so that maintenance is facilitated when the sensor is damaged, the use convenience of the sensor is improved, the service life of the sensor is prolonged, and the cost is saved.

Description

Technical Field

[0001] The utility model belongs to the technical field of sensors, and in particular relates to a capacitive pressure sensor. Background Art

[0002] At present, ceramic capacitive pressure sensors are all equipped with electrodes on the opposite sides of two thick and thin ceramic substrates, and ceramic balls, resin balls, low temperature co-fired (LTCC) ceramic green sheets, etc. are used as spacers to control the distance between the electrodes to form a flat capacitor with a specified initial capacitance value. When the ceramic substrate is subjected to external pressure, the thin substrate will bend and deform along the thickness direction of the plate, resulting in a change in capacitance. Based on this change in capacitance, the external pressure on the substrate can be detected.

[0003] After my search, the prior art discloses a ceramic capacitive pressure sensor (application number 202122412965.X), including a main body, a first substrate, a second substrate, a first metal electrode and a second metal electrode, the first substrate and the second substrate are fixedly arranged at both ends of the main body, the first metal electrode and the second metal electrode are arranged in the center position corresponding to the inner surfaces of the first substrate and the second substrate respectively, and the surfaces of the first substrate and the second substrate are fixedly provided with a first lead hole and a second lead hole, and the first lead hole and the second lead hole are arranged relatively to each other.

[0004] The ceramic capacitive pressure sensor disclosed in the above cited document has a first substrate and a second substrate that are sealed and sintered by glue slurry, so that when the sensor fails, it is not convenient to dismantle and repair, which leads to a short average life of the sensor and high cost consumption.

[0005] In view of this, the present utility model is proposed. Utility Model Content

[0006] In order to solve the above technical problems, the basic concept of the technical solution adopted by the utility model is:

[0007] A capacitive pressure sensor, comprising:

[0008] The main body has a circular cross section, and both ends of the main body are provided with circular concave sealing grooves;

[0009] The substrate mechanism includes a first substrate and a second substrate, the first substrate and the second substrate are respectively arranged at two ends of the main body, and the first substrate and the second substrate are sealed with the main body;

[0010] The sealing assembly includes a flange, a sealing ring, and a convex ring. The flange is arranged at the inner wall position of the bottom of the two sealing grooves, the sealing ring is arranged in the sealing groove, and the convex ring is arranged at the first substrate and the second substrate near one end of the sealing groove;

[0011] The disassembly and assembly structure comprises a clamping groove and a rotating ring, wherein the flanges are arranged at both ends of the main body, and the rotating ring is arranged on the first base body and the second base body.

[0012] As a preferred embodiment of the utility model, the cross-sections of the first substrate and the second substrate are both stepped, including a ceramic plate with a smaller outer diameter and a mounting plate with a larger outer diameter. The mounting plate is arranged on the outer side of the circumference of the ceramic plate close to one end of the main body, and the outer diameter of the mounting plate is adapted to the outer inner wall of the sealing groove.

[0013] As a preferred embodiment of the utility model, a first electrode is arranged at the center position between the two sides of the first substrate, and a first lead hole is arranged between the two sides of the first substrate and located outside the circumference of the first electrode; a second electrode is arranged at the center position between the two sides of the second substrate, and a second lead hole is arranged between the two sides of the second substrate and located outside the circumference of the second electrode.

[0014] As a preferred embodiment of the utility model, two flanges are provided, and the two flanges are respectively arranged at the inner wall positions of the bottom of two sealing grooves, and the flanges are annular protrusions with arc-shaped cross-sections.

[0015] As a preferred embodiment of the present invention, two sealing rings are provided, the two sealing rings are respectively embedded between the inner walls of the two sealing grooves, and the sealing rings are in a ring shape made of silicone material.

[0016] As a preferred embodiment of the utility model, two convex rings are provided, and the two convex rings are respectively arranged at positions corresponding to the sealing groove near one end of the sealing groove of the first substrate and the second substrate, and the convex rings are in the shape of circular ring protrusions.

[0017] As a preferred embodiment of the utility model, the card slots are evenly distributed in a circular array at both ends of the main body between the inner and outer walls of the two sealing grooves, and the card slots are L-shaped. There are two rotating rings, which are rotatably installed on the first substrate and the second substrate respectively and are located on the outer side of the circumference of the ceramic plate, and card blocks are provided on the outer side of the circumference of the rotating ring corresponding to the card slots one by one, and the card blocks are engaged with the card slots.

[0018] Compared with the prior art, the utility model has the following beneficial effects:

[0019] 1. The first substrate and the second substrate can be detachably installed by means of the structures such as the rotating ring and the card slot, so that it is convenient to repair the sensor when it is damaged, which improves the convenience of using the sensor, increases the service life of the sensor, and saves costs; when disassembling and assembling, it is only necessary to rotate the rotating rings on the first substrate and the second substrate to make the card block rotate into or out of the card slot to realize the disassembly and assembly of the first substrate and the second substrate, which is convenient and quick.

[0020] 2. By providing the flange, sealing ring, convex ring and other structures, when the first substrate and the second substrate are buckled, the convex ring presses the sealing ring, and at the same time, the flange and the convex ring are embedded in the sealing ring of silicone material to form multiple sealing lines, which is beneficial to improve the sealing effect.

[0021] The specific implementation of the utility model is further described in detail below with reference to the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In the attached picture:

[0023] Figure 1 It is a schematic diagram of the overall structure of the utility model;

[0024] Figure 2 It is a schematic diagram of the exploded structure of the utility model;

[0025] Figure 3 This is a schematic diagram of the swivel installation structure of the utility model;

[0026] Figure 4 It is a cross-sectional structural schematic diagram of the utility model;

[0027] Figure 5 For the utility model Figure 4 Enlarged view of point A in the middle.

[0028] In the figure: 10, main body; 11, sealing groove; 12, clamping groove; 13, flange; 20, first substrate; 21, first electrode; 22, first lead hole; 30, second substrate; 31, second electrode; 32, second lead hole; 40, sealing ring; 50, convex ring; 60, swivel ring; 61, clamping block. DETAILED DESCRIPTION

[0029] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. The following embodiments are used to illustrate the utility model.

[0030] A capacitive pressure sensor, such as Figure 1-3 As shown, including:

[0031] The main body 10 has a circular ring-shaped cross section, and both ends of the main body 10 are provided with a circular ring-shaped concave sealing groove 11;

[0032] The substrate mechanism includes a first substrate 20 and a second substrate 30, which are respectively disposed at two ends of the main body 10, and the first substrate 20 and the second substrate 30 are sealed with the main body 10;

[0033] The sealing assembly includes a flange 13, a sealing ring 40, and a convex ring 50. The flange 13 is arranged at the inner wall position of the bottom of the two sealing grooves 11, the sealing ring 40 is arranged in the sealing groove 11, and the convex ring 50 is arranged at the first substrate 20 and the second substrate 30 near one end of the sealing groove 11;

[0034] The disassembly and assembly structure includes a slot 12 and a rotating ring 60 . The flanges 13 are arranged at both ends of the main body 10 . The rotating ring 60 is arranged on the first base 20 and the second base 30 .

[0035] like Figure 2-3 As shown, the cross-sections of the first substrate 20 and the second substrate 30 are both stepped, including a ceramic plate with a smaller outer diameter and a mounting plate with a larger outer diameter. The mounting plate is arranged on the outer side of the ceramic plate near one end of the main body 10, and the outer diameter of the mounting plate is adapted to the outer inner wall of the sealing groove 11.

[0036] like Figure 2 As shown, a first electrode 21 is provided at the center position between the two sides of the first substrate 20, and a first lead hole 22 is provided between the two sides of the first substrate 20 and located outside the circumference of the first electrode 21, a second electrode 31 is provided at the center position between the two sides of the second substrate 30, and a second lead hole 32 is provided between the two sides of the second substrate 30 and located outside the circumference of the second electrode 31.

[0037] like Figure 2 , Figure 4 , Figure 5 As shown, two flanges 13 are provided, and the two flanges 13 are respectively provided at the inner wall positions of the bottoms of the two sealing grooves 11, and the flanges 13 are annular protrusions with arc-shaped cross sections.

[0038] like Figure 2 , Figure 5 As shown, two sealing rings 40 are provided, and the two sealing rings 40 are respectively embedded between the inner walls of the two sealing grooves 11, and the sealing rings 40 are in a ring shape made of silicone material.

[0039] like Figure 2 , Figure 5 As shown, two convex rings 50 are provided, and the two convex rings 50 are respectively arranged at positions corresponding to the sealing groove 11 at one end of the first substrate 20 and the second substrate 30 close to the sealing groove 11, and the convex ring 50 is in the shape of a circular ring protrusion.

[0040] Its function is that through the provided structures such as the flange 13, the sealing ring 40, the convex ring 50, etc., when the first substrate 20 and the second substrate 30 are buckled, the convex ring 50 presses the sealing ring 40, and at the same time, the flange 13 and the convex ring 50 are embedded in the sealing ring 40 made of silicone material to form multiple sealing lines, which is beneficial to improve the sealing effect.

[0041] like Figure 2-3As shown, the card slots 12 are evenly spaced and distributed in a circular array at both ends of the main body 10 between the inner and outer walls of the two sealing grooves 11. The card slots 12 are L-shaped, and two rotating rings 60 are provided. The two rotating rings 60 are rotatably installed on the first substrate 20 and the second substrate 30 respectively and are located on the outer side of the circumference of the ceramic plate, and a card block 61 is provided on the outer side of the circumference of the rotating ring 60 corresponding to the card slot 12 one by one, and the card block 61 is card-fitted with the card slot 12.

[0042] Its function is that, through the structures such as the rotating ring 60 and the card slot 12, the first substrate 20 and the second substrate 30 can be detachably installed, so as to facilitate the repair of the sensor when it is damaged, improve the convenience of using the sensor, increase the service life of the sensor, and save costs; when disassembling and assembling, it is only necessary to rotate the rotating ring 60 on the first substrate 20 and the second substrate 30 so that the card block 61 is rotated into or out of the card slot 12 to realize the disassembly and assembly of the first substrate 20 and the second substrate 30, which is convenient and quick.

[0043] It is understood that the present invention is described by some embodiments, and those skilled in the art are aware that various changes or equivalent substitutions may be made to these features and embodiments without departing from the spirit and scope of the present invention. In addition, under the teachings of the present invention, these features and embodiments may be modified to adapt to specific circumstances and materials without departing from the spirit and scope of the present invention. Therefore, the present invention is not limited to the specific embodiments disclosed herein, and all embodiments falling within the scope of the claims of this application are within the scope of protection of the present invention.

Claims

1. A capacitive pressure sensor, characterized in that: include: A main body (10), the main body (10) has a circular ring-shaped cross section, and both ends of the main body (10) are provided with a sealing groove (11) in the shape of a circular ring; A substrate mechanism, the substrate mechanism comprising a first substrate (20) and a second substrate (30), the first substrate (20) and the second substrate (30) being respectively arranged at two ends of the main body (10), and the first substrate (20) and the second substrate (30) being sealed and matched with the main body (10); A sealing assembly, the sealing assembly comprising a flange (13), a sealing ring (40), and a convex ring (50), wherein the flange (13) is arranged at the inner wall position of the bottom of two sealing grooves (11), the sealing ring (40) is arranged in the sealing groove (11), and the convex ring (50) is arranged at a position of the first base body (20) and the second base body (30) close to one end of the sealing groove (11); The disassembly and assembly structure comprises a slot (12) and a rotating ring (60), wherein the flange (13) is arranged at both ends of the main body (10), and the rotating ring (60) is arranged on the first base body (20) and the second base body (30).

2. The capacitive pressure sensor according to claim 1, characterized in that: The first substrate (20) and the second substrate (30) are both stepped in cross-section and include a ceramic plate with a smaller outer diameter and a mounting plate with a larger outer diameter. The mounting plate is arranged on the outer side of the circumference of the ceramic plate close to one end of the main body (10), and the outer diameter of the mounting plate is adapted to the outer inner wall of the sealing groove (11).

3. The capacitive pressure sensor according to claim 2, characterized in that: A first electrode (21) is provided at a central position between two sides of the first substrate (20), and a first lead hole (22) is provided between two sides of the first substrate (20) and outside the circumference of the first electrode (21); a second electrode (31) is provided at a central position between two sides of the second substrate (30), and a second lead hole (32) is provided between two sides of the second substrate (30) and outside the circumference of the second electrode (31).

4. The capacitive pressure sensor according to claim 3, characterized in that: Two flanges (13) are provided, and the two flanges (13) are respectively arranged at the inner wall positions of the bottoms of the two sealing grooves (11), and the flanges (13) are annular protrusions with arc-shaped cross sections.

5. The capacitive pressure sensor according to claim 4, characterized in that: Two sealing rings (40) are provided, and the two sealing rings (40) are respectively embedded between the inner walls of the two sealing grooves (11), and the sealing rings (40) are in the shape of a ring made of silicone material.

6. The capacitive pressure sensor according to claim 5, characterized in that: Two convex rings (50) are provided, and the two convex rings (50) are respectively arranged at positions corresponding to the sealing groove (11) on one end of the first base body (20) and the second base body (30), and the convex rings (50) are in the shape of circular protrusions.

7. The capacitive pressure sensor according to claim 1, characterized in that: The clamping grooves (12) are evenly spaced and arranged at both ends of the main body (10) in a circular array, between the outer and outer walls of the two sealing grooves (11); the clamping grooves (12) are L-shaped; two rotating rings (60) are provided, and the two rotating rings (60) are rotatably mounted on the first base body (20) and the second base body (30) respectively and are located on the outer side of the circumference of the ceramic plate; and clamping blocks (61) are arranged on the outer side of the circumference of the rotating rings (60) in a one-to-one correspondence with the clamping grooves (12); the clamping blocks (61) are clamped and matched with the clamping grooves (12).

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