Thin film pressure sensor without lead packaging

Abstract

The utility model relates to the technical field of pressure sensors, and discloses a leadless packaging film pressure sensor, which comprises a shell and a sensor body arranged in the shell, one end of the shell is provided with a connecting seat, the connecting seat is connected with a frame through internal and external threads, two sides of the shell are provided with first grooves, and the first grooves are provided with second grooves. A second groove matched with the first groove is formed in the frame, a limiting assembly is arranged in the first groove and comprises a push rod, a connecting plate slidably installed in the first groove and a first spring, the push rod is connected with the outer side face of the connecting plate and extends out of the shell, one end of the first spring is connected with the inner side face of the connecting plate, and the other end of the first spring is connected with the second groove. A clamping block is arranged on the outer side face of the connecting plate, and a clamping groove allowing the clamping block to be inserted therein is formed in the inner wall of the second groove. Dual connection between the shell and the frame is formed by arranging the connecting base and the limiting assembly, detachable assembly of the sensor and the underwater robot is achieved, and connection stability is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of pressure sensors, in particular to a leadless packaged thin film pressure sensor. Background Art

[0002] Thin-film pressure sensors eliminate the bonding of traditional strain gauges, and have low creep, strong vibration and impact resistance, good stability, and high reliability. They have always been the preferred sensor for pressure measurement in various harsh environments, such as underwater pressure measurement. The existing technology mainly fixes the thin-film pressure sensor inside the underwater robot cabin. If the thin-film pressure sensor needs to be maintained or replaced, the robot body must be disassembled first, which is a huge workload. Utility Model Content

[0003] The utility model aims to provide a leadless packaged thin film pressure sensor to solve the problems raised in the above background technology.

[0004] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a leadless packaged thin film pressure sensor, which can be detachably installed on the frame of an underwater robot, comprises a shell and a sensor body installed in the shell, a connecting seat is provided at one end of the shell, the connecting seat and the frame are connected by internal and external threads, grooves 1 are provided on both sides of the shell, a groove 2 matching the groove 1 is provided on the frame, a limit assembly is provided in the groove 1, the limit assembly comprises a push rod, a connecting plate slidably installed in the groove and a spring, the push rod is connected to the outer side surface of the connecting plate and extends to the outside of the shell, one end of the spring is connected to the inner side surface of the connecting plate, and the other end is connected to the inner wall of the groove, a card block is provided on the outer side surface of the connecting plate, and a card slot for inserting the card block is provided on the inner wall of the groove 2.

[0005] The following improvements are made in the present application: a waterproof baffle is provided on the shell between the connecting seat and the groove one, and a groove three matching with the waterproof baffle is provided on the frame.

[0006] The following improvement is made in the solution of the present application: a through groove is provided in the middle of the connecting seat, and an annular groove corresponding to the connecting seat is provided on the frame, and the inner diameter of the annular groove matches the diameter of the through groove.

[0007] The following improvement is made in the present application: a cavity is provided inside the shell, the sensor body is located in the cavity, and sealing gaskets are provided on both sides of the sensor body, and both ends of the sealing gaskets are embedded in the inner wall of the cavity.

[0008] The following improvements are made in the present application: a diaphragm is embedded on the outer surface of the housing, and a sealing waterproof pad is coated on the diaphragm. The pressure acts directly on the diaphragm, causing the diaphragm to produce a micro-displacement proportional to the medium pressure, causing the resistance of the sensor to change, and the electronic circuit detects this change and converts and outputs a digital standard signal corresponding to this pressure; and the diaphragm is protected by the sealing waterproof pad, which does not affect the accuracy of the pressure measurement.

[0009] The following improvement is made in the present application: the cavity between the two sealing gaskets is filled with silica gel. By arranging the sealing gasket outside the sensor and filling it with silica gel, the sealing of the inner cavity containing the sensor is improved to the greatest extent, ensuring the normal operation of the sensor.

[0010] Compared with the prior art, the utility model provides a leadless packaged thin film pressure sensor, which has the following beneficial effects:

[0011] The utility model forms a double connection between the shell and the frame by arranging a connecting seat and a limit assembly, thereby ensuring the connection stability while realizing the detachable assembly of the sensor body and the underwater robot. When the connecting seat and the frame are threadedly connected, the push rod is first pushed to compress the spring and hide the push rod in a groove to avoid interference with the rotation. After the connecting seat and the frame are completely connected, the push rod is released, and the card block is inserted into the card slot under the elastic force of the spring to further lock it. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative labor:

[0013] Figure 1 It is a schematic diagram of the connection between the utility model and the frame;

[0014] Figure 2 It is a cross-sectional view of the utility model.

[0015] In the figure: 1. frame; 11. groove 2; 12. card slot; 13. groove 3; 14. ring groove; 2. shell; 21. connecting seat; 22. groove 1; 23. waterproof baffle; 24. cavity; 241. silica gel; 25. sealing gasket; 26. diaphragm; 261. sealing waterproof gasket; 3. sensor body; 4. push rod; 41. connecting plate; 42. spring; 43. block. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0017] In the present invention, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0018] Example

[0019] like Figure 1-2 As shown, a leadless packaged thin film pressure sensor can be detachably installed on the frame 1 of an underwater robot, and is mainly composed of a shell 2, a sensor body 3 and a limit assembly; wherein, a connecting seat 21 is provided at one end of the shell 2, and the connecting seat 21 and the shell 2 are integrally formed, a through groove is provided in the middle of the connecting seat 21, and an annular groove 14 corresponding to the connecting seat 21 is provided on the frame 1, the inner diameter of the annular groove 14 matches the diameter of the through groove, and an internal thread is provided on the inner wall of the through groove, and an external thread is provided on the inner side wall of the annular groove 14, and the shell 2 and the frame 1 are connected by internal and external threads.

[0020] A groove 22 is provided on both sides of the shell 2, and a limit assembly is arranged in the groove 22. A groove 11 matching the groove 22 is provided on the frame 1. The shell 2 is connected to the frame 1 through the limit assembly to further improve the installation stability. The limit assembly includes a push rod 4, a connecting plate 41 and a spring 42 slidably installed in the groove 22. The push rod 4 is connected to the outer side of the connecting plate 41 and extends to the outside of the shell 2. One end of the spring 42 is connected to the inner side of the connecting plate 41, and the other end is connected to the inner wall of the groove 22. A block 43 is provided on the outer side of the connecting plate 41, and a slot 12 for inserting the block 43 is provided on the inner wall of the groove 11; when the connecting seat 21 and the frame 1 are threadedly connected, the push rod 4 is first pushed to compress the spring 42, and the push rod 4 is hidden in the groove 22 to avoid interference with the rotation. After the connecting seat 21 and the frame 1 are fully connected, the push rod 4 is released, and the block 43 is inserted into the slot 12 under the elastic force of the spring 42 to form a further lock.

[0021] A waterproof baffle 23 is provided on the shell 2 located between the connecting seat 21 and the groove 1 22, and a groove 3 13 matching the waterproof baffle 23 is opened on the frame 1; a cavity 24 is provided inside the shell 2, and the sensor body 3 is located in the cavity 24. At the same time, sealing gaskets 25 are provided on both sides of the sensor body 3, and the two ends of the sealing gasket 25 are embedded in the inner wall of the cavity 24, and the cavity 24 between the two sealing gaskets 25 is filled with silica gel 241, so as to fully protect the sensor body 2; a diaphragm 26 is embedded on the outer surface of the shell 2, and a sealing waterproof pad 261 is covered on the diaphragm 26.

Claims

1. A leadless packaged thin film pressure sensor, detachably mounted on a frame (1) of an underwater robot, characterized in that: The invention comprises a shell (2) and a sensor body (3) installed in the shell (2); a connecting seat (21) is provided at one end of the shell (2); the connecting seat (21) is connected to the frame (1) by internal and external threads; grooves (22) are provided on both sides of the shell (2); a groove (11) matching the groove (22) is provided on the frame (1); a limit assembly is provided in the groove (22); the limit assembly comprises a push rod (4), a connecting plate (41) slidably installed in the groove (22) and a spring (42); the push rod (4) is connected to the outer side surface of the connecting plate (41) and extends to the outside of the shell (2); one end of the spring (42) is connected to the inner side surface of the connecting plate (41), and the other end is connected to the inner wall of the groove (22); a clamping block (43) is provided on the outer side surface of the connecting plate (41); and a clamping slot (12) for inserting the clamping block (43) is provided on the inner wall of the groove (11).

2. The leadless packaged thin film pressure sensor according to claim 1, characterized in that: A waterproof baffle (23) is provided on the shell (2) between the connecting seat (21) and the groove one (22), and a groove three (13) matching with the waterproof baffle (23) is provided on the frame (1).

3. The leadless packaged thin film pressure sensor according to claim 1, characterized in that: A through groove is provided in the middle of the connection seat (21), and an annular groove (14) corresponding to the connection seat (21) is provided on the frame (1), wherein the inner diameter of the annular groove (14) matches the diameter of the through groove.

4. The leadless packaged thin film pressure sensor according to claim 1, characterized in that: A cavity (24) is provided inside the housing (2), the sensor body (3) is located in the cavity (24), and sealing gaskets (25) are provided on both sides of the sensor body (3), with both ends of the sealing gasket (25) embedded in the inner wall of the cavity (24).

5. The leadless packaged thin film pressure sensor according to claim 4, characterized in that: A diaphragm (26) is embedded on the outer surface of the shell (2), and a sealing waterproof pad (261) is coated on the diaphragm (26).

6. The leadless packaged thin film pressure sensor according to claim 5, characterized in that: The cavity (24) between the two sealing gaskets (25) is filled with silica gel (241).

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