High-sensitivity capacitive flexible pressure sensor

Abstract

The utility model relates to the technical field of pressure sensors, and discloses a high-sensitivity capacitive flexible pressure sensor, which comprises a flexible shell, two leads and connecting mechanisms, the connecting mechanisms are fixedly arranged at the front end and the rear end of the flexible shell, and each connecting mechanism comprises two connecting seats. The sides, away from the center of the flexible shell, of the wires penetrate through the flexible shell and are fixedly connected with connectors, two sliding grooves are formed in the sides, close to the flexible shell, of the connecting bases, and elastic pieces are fixedly connected to the inner walls of the sides, close to the center of the connecting bases, of the sliding grooves. The sides, away from the center of the connecting base, of the elastic pieces are fixedly connected with clamping blocks. According to the utility model, the clamping block in the connecting mechanism clamps the fixing block in the sliding groove under the action of the elastic sheet, and the pressing block fixedly connected with the clamping block is matched, so that a worker can conveniently press the pressing block to disassemble and assemble the high-sensitivity capacitive flexible pressure sensor.

Description

TECHNICAL FIELD

[0001] The utility model relates to pressure sensor technical field especially relates to a kind of high-sensitivity flexible pressure sensor of capacitive. BACKGROUND

[0002] High-sensitivity flexible pressure sensor of capacitive is a kind of sensor that can convert the pressure exerted on its surface into electrical signal output, it utilizes the pressure acting on its surface, causes the electrode spacing inside sensor to change, thereby leading to the change of capacitance value, and reflects the size of pressure.

[0003] However, the existing high-sensitivity flexible pressure sensor of capacitive on the market is mostly inconvenient for workers to disassemble and maintain or replace the high-sensitivity flexible pressure sensor of capacitive after welding the wires and the circuit board together, increasing the difficulty of maintenance and replacement.

[0004] Therefore, the skilled in the art provides a kind of high-sensitivity flexible pressure sensor of capacitive to solve the problems raised in the above background. UTILITY MODEL CONTENT

[0005] The utility model discloses a kind of high-sensitivity flexible pressure sensor of capacitive to solve the problems raised in the above background, and the fixed block is clamped in the sliding slot under the action of elastic sheet by the clamping block in connecting mechanism, cooperate with the push block fixedly connected with clamping block, it is convenient for staff to press push block and disassemble high-sensitivity flexible pressure sensor of capacitive.

[0006] To achieve the above object, the utility model provides the following technical scheme:

[0007] A kind of high-sensitivity flexible pressure sensor of capacitive, including flexible shell, two wires and connecting mechanism, the front end and rear end of flexible shell are fixedly provided with connecting mechanism, the connecting mechanism includes two connecting seats, the side of wire away from the center of flexible shell is all through flexible shell and is fixedly connected with connector, the side of connecting seat close to flexible shell is all set with two sliding slots, the inner wall of the side of sliding slot close to the center of connecting seat is all fixedly connected with elastic sheet, the side of elastic sheet away from the center of connecting seat is all fixedly connected with clamping block, the side of connector away from the center of flexible shell is all fixedly connected with two fixed blocks, the side of clamping block away from the center of connecting seat is all fixedly connected with push block, the side of connecting seat away from the center of flexible shell is all fixedly connected with external connection line;

[0008] Through the technical scheme, the clamping block in the connecting mechanism is clamped in the sliding groove under the action of the elastic sheet, so that the connecting head is kept in the state of being inserted into the connecting seat, and the pressing block fixedly connected with the clamping block is pressed to release the clamping of the clamping block on the fixed block, so that the connecting head and the connecting seat can be separated, and the high-sensitivity flexible capacitive pressure sensor is convenient for workers to disassemble and assemble.

[0009] Further, the top surface and the bottom surface inside the flexible shell are fixedly connected with conductive layers through coated polyurethane glue, and the middle parts of the conductive layers away from the side of the center of the flexible shell are fixedly connected with wires;

[0010] Through the technical scheme, the flexible shell is a PDMS film made of polydimethylsiloxane, which is wrapped inside and has good flexibility. The conductive layer is a film made of graphene material, which has good conductivity. The conductive layer is fixedly connected with the wire, so that the conductive layer can be connected to the current to form the two poles of the capacitor.

[0011] Further, the fixed blocks are clamped and connected with the clamping blocks, and the clamping blocks slide in the interiors of the sliding grooves;

[0012] Through the technical scheme, under the action of the elastic sheet, the clamping block can be kept in close contact with the inner wall of the sliding groove, and the fixed block is clamped when it is inserted. Pressing the pressing block can make the clamping block slide in the sliding groove.

[0013] Further, the side of the pressing block away from the center of the connecting seat is penetrated through the sliding groove to the outside of the connecting seat;

[0014] Through the technical scheme, the pressing block is penetrated out of the connecting seat to the outside, so that the staff can press the pressing block to move the clamping block in the sliding groove and change the clamping state of the clamping block and the fixed block.

[0015] Further, the side of the conductive layer close to the center of the flexible shell is fixedly connected with an insulating layer through coated polyurethane glue;

[0016] Through the technical scheme, a PMMA film made of polymethyl methacrylate is fixed on the conductive layer as an insulating layer by using polyurethane glue, which avoids the mutual contact between the conductive layers to cause short circuit of the sensor. The coated polyurethane glue has good flexibility, which is suitable for the flexible characteristics of the sensor.

[0017] Further, the side of the insulating layer close to the center of the flexible shell is fixedly connected with a plurality of supporting blocks through coated polyurethane glue;

[0018] Through the technical scheme, the double-ring support block made of polyvinylidene fluoride with good flexibility is fixedly connected between the insulating layers, so that the sensor can quickly return to the original position after the external pressure disappears, and the measurement hysteresis of the sensor after the external force disappears is reduced.

[0019] The utility model has the advantages of the following beneficial effects:

[0020] 1. The high-sensitivity capacitive flexible pressure sensor disclosed by the utility model has the advantages that the clamping block in the connecting mechanism is clamped in the sliding groove under the action of the elastic sheet, the connecting head is kept in the state of being inserted in the connecting seat, and the clamping of the clamping block on the fixed block can be released by pressing the pressing block fixedly connected with the clamping block, so that the connecting head and the connecting seat can be separated, and then the high-sensitivity capacitive flexible pressure sensor can be conveniently disassembled for maintenance and replacement, and the difficulty of maintenance and replacement is reduced.

[0021] 2. The high-sensitivity capacitive flexible pressure sensor disclosed by the utility model has the advantages that the PMMA film made of polymethyl methacrylate is glued on the conductive layer as an insulating layer, so that the mutual contact between the conductive layers is avoided to prevent the sensor from being short-circuited, and the double-ring support block made of polyvinylidene fluoride with good flexibility is used, so that the sensor can quickly return to the original position after the external pressure disappears, and the measurement hysteresis of the sensor after the external force disappears is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 FIG. 1 is a schematic view of the main structure of the high-sensitivity capacitive flexible pressure sensor disclosed by the utility model;

[0023] Figure 2 FIG. 2 is a side sectional view of the local mechanism of the high-sensitivity capacitive flexible pressure sensor disclosed by the utility model;

[0024] Figure 3 FIG. 3 is a diagram of the connecting seat, the external connecting wire, the connecting head and the lead wire of the high-sensitivity capacitive flexible pressure sensor disclosed by the utility model;

[0025] Figure 4 FIG. 4 is an axial sectional view of the connecting seat and the connecting head of the high-sensitivity capacitive flexible pressure sensor disclosed by the utility model;

[0026] Figure 5 FIG. 5 is an enlarged view of position A in FIG. 1. Figure 4

[0027] LEGEND:

[0028] ​1-flexible shell; 2-conductive layer; 3-supporting block; 4-insulating layer; 5-wire; 6-connecting mechanism; 601-connecting seat; 602-slotted; 603-elastic sheet; 604-clamping block; 605-pressing block; 606-connecting head; 607-fixing block; 7-external wire. DETAILED DESCRIPTION

[0029] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work fall within the scope of protection of the present application.

[0030] Referring to Figures 1-5 The present application provides an embodiment: a high-sensitivity capacitive flexible pressure sensor, comprising a flexible shell 1, two wires 5 and a connecting mechanism 6, the front end and the rear end of the flexible shell 1 are fixedly provided with the connecting mechanism 6, the connecting mechanism 6 comprises two connecting seats 601, the wires 5 away from the center of the flexible shell 1 on one side are all penetrated through the flexible shell 1 and fixedly connected with the connecting head 606, the side of the connecting seat 601 close to the flexible shell 1 is provided with two slotted 602, the inner wall of the slotted 602 close to the center of the connecting seat 601 on one side is all fixedly connected with the elastic sheet 603, the side of the elastic sheet 603 away from the center of the connecting seat 601 is all fixedly connected with the clamping block 604, the side of the connecting head 606 away from the center of the flexible shell 1 is all fixedly connected with two fixing blocks 607, the side of the clamping block 604 away from the center of the connecting seat 601 is all fixedly connected with the pressing block 605, and the side of the connecting seat 601 away from the center of the flexible shell 1 is all fixedly connected with the external wire 7.

[0031] The clamping block 604 in the connecting mechanism 6 is clamped in the slotted 602 under the action of the elastic sheet 603, so that the connecting head 606 remains inserted in the connecting seat 601, and the pressing block 605 fixedly connected with the clamping block 604 is pressed to release the clamping of the clamping block 604 on the fixing block 607, so that the connecting head 606 and the connecting seat 601 can be separated, and the high-sensitivity capacitive flexible pressure sensor is convenient for the staff to disassemble and assemble.

[0032] The top surface and the bottom surface inside the flexible shell 1 are fixedly connected with the conductive layer 2 through the coated polyurethane adhesive, the middle part of the conductive layer 2 away from the side of the center of the flexible shell 1 is fixedly connected with the wire 5, the flexible shell 1 is a PDMS film made of polydimethylsiloxane, which wraps the inside, and has good flexibility, the conductive layer 2 in it is a film made of graphene material, which has good conductivity, and the conductive layer 2 is fixedly connected with the wire 5, so that the conductive layer 2 can access current and form the two poles of the capacitor, the fixed blocks 607 are clampedly connected with the clamping blocks 604, the clamping blocks 604 slide in the inside of the sliding grooves 602, under the action of the elastic sheets 603, the clamping blocks 604 can be kept in close contact with the inner walls of the sliding grooves 602, and when the fixed blocks 607 are inserted, they are clamped, and pressing the pressing blocks 605 can make the clamping blocks 604 slide in the sliding grooves 602, the side of the pressing blocks 605 away from the center of the connecting seats 601 penetrates the sliding grooves 602 to the outside of the connecting seats 601, by making the pressing blocks 605 penetrate out of the connecting seats 601 to the outside, it is convenient for the staff to press the pressing blocks 605 to move the clamping blocks 604 in the sliding grooves 602, change the clamping state of the clamping blocks 604 and the fixed blocks 607, the side of the conductive layer 2 close to the center of the flexible shell 1 is fixedly connected with the insulating layer 4 through the coated polyurethane adhesive, a layer of PMMA film made of polymethyl methacrylate is fixed on the conductive layer 2 as the insulating layer 4 through the use of polyurethane adhesive, to avoid the mutual contact between the conductive layers 2 causing the sensor to short circuit, the coated polyurethane adhesive has good flexibility, which is suitable for the flexible characteristics of the sensor, the side of the insulating layer 4 close to the center of the flexible shell 1 is fixedly connected with a plurality of support blocks 3 through the coated polyurethane adhesive, a layer of double-ring support blocks 3 made of polyvinylidene fluoride with good flexibility is fixedly connected between the insulating layers 4, so that it can quickly return to its original position after the external pressure disappears, reducing the measurement hysteresis of the sensor after the external force disappears.

[0033] Working principle: when using the high sensitivity capacitive flexible pressure sensor, first, the staff welds the external wire 7 with the measuring circuit board, then the staff inserts the protruding part on the center of the connecting head 606 into the connecting seat 601, at the same time, the fixing block 607 fixed on the connecting head 606 is also inserted into the sliding groove 602 to force the inclined clamping block 604 to move, and the fixing block 607 is clamped under the action of the elastic sheet 603, completing the connection of the wire 5, secondly, the staff pastes and fixes the sensor at the measuring position through the double-sided adhesive, after the circuit board is powered on, the current flows to the conductive layer 2 made of graphene through the external wire 7 and the wire 5, forming the electrode of the capacitor, when the external pressure acts on the flexible shell 1, the support block 3 made of polyvinylidene fluoride is extruded, at this time, the change of the distance between the conductive layer 2 will be reflected as the change of the current, and when the external force disappears, the support block 3 quickly restores to the original position, the conductive layer 2 also restores to the original position, during the process, the current change can reflect the pressure, finally, the staff can press the pressing block 605 to drive the clamping block 604 to move after power off, the clamping of the fixing block 607 is released, the connecting head 606 is pulled out, completing the disassembly of the sensor for maintenance and replacement.

[0034] Finally, it should be noted that: the above only for the preferred specific embodiments of the present application, and is not intended to limit the present application, although the foregoing detailed description of the present application, for the skilled in the art, it can still be modified, or part of the technical features of the equivalent replacement, within the spirit and principles of the present application, any modification, equivalent replacement, improvement, etc., should be included in the scope of the present application.

Claims

1. A high-sensitivity capacitive flexible pressure sensor comprising a flexible housing (1), two conducting wires (5) and a connection mechanism (6), characterized in that: The front end and the rear end of the flexible shell (1) are fixedly provided with connecting mechanisms (6), the connecting mechanism (6) comprises two connecting seats (601), the wires (5) are fixedly connected with connecting heads (606) penetrating through the flexible shell (1) away from one side of the center of the flexible shell (1), the connecting seat (601) is provided with two sliding grooves (602) on one side close to the flexible shell (1), the inner wall of one side close to the center of the sliding groove (602) is fixedly connected with an elastic sheet (603), the elastic sheet (603) is fixedly connected with a clamping block (604) away from one side of the center of the connecting seat (601), the connecting head (606) is fixedly connected with two fixed blocks (607) away from one side of the center of the flexible shell (1), the clamping block (604) is fixedly connected with a pressing block (605) away from one side of the center of the connecting seat (601), and the connecting seat (601) is fixedly connected with an external wire (7) away from one side of the center of the flexible shell (1).

2. The high-sensitivity capacitive flexible pressure sensor according to claim 1, characterized in that: The top surface and the bottom surface inside the flexible shell (1) are fixedly connected with conductive layers (2) through coated polyurethane glue, and the middle part of one side away from the center of the flexible shell (1) of the conductive layer (2) is fixedly connected with the wire (5).

3. The high-sensitivity capacitive flexible pressure sensor according to claim 1, wherein: The fixed block (607) is connected with the clamping block (604), and the clamping block (604) slides in the sliding groove (602).

4. The high-sensitivity capacitive flexible pressure sensor according to claim 1, wherein: The pressing block (605) penetrates through the sliding groove (602) to the outside of the connecting seat (601) away from one side of the center of the connecting seat (601).

5. The high-sensitivity capacitive flexible pressure sensor according to claim 2, wherein: The conductive layer (2) is fixedly connected with an insulating layer (4) on one side close to the center of the flexible shell (1) through coated polyurethane glue.

6. The high-sensitivity capacitive flexible pressure sensor according to claim 5, characterized in that: The insulating layer (4) is fixedly connected with a plurality of supporting blocks (3) on one side close to the center of the flexible shell (1) through coated polyurethane glue.

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