Ceramic pressure sensor packaging structure

Abstract

The utility model provides a ceramic pressure sensor packaging structure, which comprises an upper shell and a lower shell, a ceramic pressure sensor is arranged in the lower shell, a circuit board is fixed on the ceramic pressure sensor, a sealing structure and a heat dissipation structure are arranged between the ceramic pressure sensor and the upper shell, a pressure port and a connecting port are arranged in the lower shell, and the pressure port and the connecting port are connected with the circuit board. A piston is arranged in the pressure opening in a sliding fit mode, and a limiting structure is arranged in the pressure opening and corresponds to the piston. According to the utility model, the sealing structure and the heat dissipation structure are installed between the ceramic pressure sensor and the upper shell, the ceramic pressure sensor is installed through the installation seat, and the ceramic pressure sensor is prevented from moving or being influenced by external force, so that the accuracy of results is ensured; pressure can be measured by squeezing air through movement of the piston, direct contact with the diaphragm after freezing can be prevented, and the ceramic pressure sensor is prevented from being damaged.

Description

Technical Field

[0001] The utility model relates to the technical field of sensor packaging, in particular to a ceramic pressure sensor packaging structure. Background Art

[0002] Pressure sensor is one of the most commonly used sensors in industrial practice. It has excellent characteristics such as simple structure, small size, light weight and long service life. It has been widely used in aircraft, automobiles, ships, bridges and other fields. With the development of the times, there are more and more types of pressure sensors, among which ceramic pressure sensors are particularly widely used. For example, the patent with publication number CN211121701U discloses a packaging structure of a ceramic pressure sensor, in which one end of the connecting part of the device is located in the middle position and is penetrated by a pressure port, a foam pad layer is provided inside the insulation layer on the outside of the pressure port, and a conical gap is separated between the insulation layer and the foam pad layer, a heat dissipation mechanism is fixed below the signal processing board, and an output line is connected to the middle position below the signal processing board. The device forms a conical gap between the insulation layer and the foam cushion layer. When the volume of the liquid ice gradually increases, the foam cushion layer is squeezed into the conical gap, so that the liquid ice tends to expand in the horizontal direction, thereby avoiding the squeezing of the diaphragm by the vertical expansion of the liquid when it freezes. However, the liquid ice expands toward the circumference. Although a gap is left for compensation, it is inevitable that the ice will contact the diaphragm after the expansion, which may cause damage to the diaphragm. When the test pressure is too high, it will also cause damage to the pressure sensor.

[0003] To this end, the utility model provides a ceramic pressure sensor packaging structure. Utility Model Content

[0004] In view of the deficiencies in the prior art, the purpose of the utility model is to provide a ceramic pressure sensor packaging structure to solve the problems raised in the above-mentioned background technology. The utility model can prevent the ceramic pressure sensor from moving or being affected by external forces, thereby ensuring the accuracy of the results; the pressure can be measured by squeezing the air by moving the piston, and direct contact with the diaphragm after freezing can be prevented to prevent damage to the ceramic pressure sensor. The piston can also be limited by a limiting structure to prevent excessive pressure from being generated, thereby preventing the ceramic pressure sensor from being damaged due to exceeding the measurement range.

[0005] In order to achieve the above-mentioned purpose, the utility model is realized through the following technical scheme: a ceramic pressure sensor packaging structure, including an upper shell and a lower shell, a ceramic pressure sensor is installed in the lower shell, a circuit board is fixed on the ceramic pressure sensor, a sealing structure and a heat dissipation structure are installed between the ceramic pressure sensor and the upper shell, a pressure port and a connecting port are opened in the lower shell, a piston is slidably fitted in the pressure port, a limiting structure is installed in the pressure port, and the limiting structure corresponds to the piston.

[0006] Furthermore, the upper shell is fixedly connected to the lower shell.

[0007] Furthermore, a mounting seat is fixed in the lower shell, and the mounting seat corresponds to the ceramic pressure sensor.

[0008] Furthermore, an output line is fixed on the circuit board, and the circuit board is fixed to the ceramic pressure sensor by welding.

[0009] Furthermore, the sealing structure includes a sealing ring, which is located between the ceramic pressure sensor and the upper shell.

[0010] Furthermore, the heat dissipation structure includes a heat conductive block and a heat dissipation block, the heat conductive block is fixedly connected to the upper shell, the heat dissipation block is fixedly connected to the lower shell, the sealing ring is in contact with the heat conductive block, and the heat conductive block is in contact with the heat dissipation block.

[0011] Furthermore, the pressure port is communicated with the connection port, and the limiting structure includes a first limiting plate and a second limiting plate.

[0012] Furthermore, the piston is threadedly matched with a plurality of screw rods.

[0013] Beneficial effects of the utility model: The utility model provides a ceramic pressure sensor packaging structure, comprising a ceramic pressure sensor; an upper shell; a sealing structure; a heat dissipation structure; a mounting seat; a pressure port; a piston; and a limit structure.

[0014] A sealing structure and a heat dissipation structure are installed between the ceramic pressure sensor and the upper shell. The ceramic pressure sensor is installed through a mounting seat to prevent the ceramic pressure sensor from moving or being affected by external forces, thereby ensuring the accuracy of the result. A piston is slidably installed in the pressure port, and a limiting structure is installed in the pressure port. The pressure can be measured by squeezing the air through the movement of the piston, and direct contact with the diaphragm after freezing can be prevented, thereby preventing the ceramic pressure sensor from being damaged. The piston can also be limited by the limiting structure to prevent excessive pressure from being generated, thereby preventing the ceramic pressure sensor from being damaged due to exceeding the measurement range. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a schematic diagram of the assembled three-dimensional structure of the overall packaging structure of a ceramic pressure sensor of the utility model;

[0016] Figure 2 This is a schematic diagram of the assembly cross-sectional structure of the overall packaging structure of a ceramic pressure sensor of the utility model;

[0017] Figure 3 for Figure 2 Schematic diagram at A in the middle;

[0018] Figure 4 for Figure 2 Schematic diagram at B in the middle;

[0019] Figure 5 This is a schematic diagram of the three-dimensional structure of the piston assembly in a ceramic pressure sensor packaging structure of the utility model;

[0020] In the figure: 1. upper shell; 2. lower shell; 3. ceramic pressure sensor; 4. mounting base; 5. circuit board; 6. output line; 7. sealing ring; 8. heat conductive block; 9. heat sink; 10. pressure port; 11. connecting port; 12. first limit plate; 13. second limit plate; 14. piston; 15. screw. DETAILED DESCRIPTION

[0021] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0022] See also Figures 1 to 5 The utility model provides a technical solution: a ceramic pressure sensor packaging structure, including an upper shell 1 and a lower shell 2, a ceramic pressure sensor 3 is installed in the lower shell 2, a circuit board 5 is fixed on the ceramic pressure sensor 3, a sealing structure and a heat dissipation structure are installed between the ceramic pressure sensor 3 and the upper shell 1, a pressure port 10 and a connecting port 11 are opened in the lower shell 2, a piston 14 is slidably fitted in the pressure port 10, a limiting structure is installed in the pressure port 10, and the limiting structure corresponds to the piston 14.

[0023] In this embodiment, the upper shell 1 and the lower shell 2 are fixed by snapping, a mounting seat 4 is fixed in the lower shell 2, the mounting seat 4 corresponds to the ceramic pressure sensor 3, an output line 6 is fixed on the circuit board 5, the circuit board 5 and the ceramic pressure sensor 3 are welded and fixed, and the sealing structure includes a sealing ring 7, which is located between the ceramic pressure sensor 3 and the upper shell 1.

[0024] Specifically, when installing the ceramic pressure sensor 3, the ceramic pressure sensor 3 is installed in the mounting seat 4, and then the upper shell 1 and the lower shell 2 are fixed. The ceramic pressure sensor 3 can be clamped and fixed. At the same time, the sealing ring 7 can be used to ensure the sealing, and the sealing ring 7 is located at the top to prevent the expansion of the sealing ring 7 from affecting the measurement result of the ceramic pressure sensor 3.

[0025] The heat dissipation structure includes a heat conducting block 8 and a heat dissipation block 9. The heat conducting block 8 is fixedly connected to the upper shell 1, and the heat dissipation block 9 is fixedly connected to the lower shell 2. The sealing ring 7 is in contact with the heat conducting block 8, and the heat conducting block 8 is in contact with the heat dissipation block 9.

[0026] Specifically, when the circuit board 5 generates heat, the heat on the circuit board 5 can be transferred to the heat dissipation block 9 through the heat conduction block 8, thereby improving the heat dissipation efficiency.

[0027] The pressure port 10 is communicated with the connection port 11 . The limiting structure includes a first limiting plate 12 and a second limiting plate 13 . A plurality of screw rods 15 are threadedly engaged on the piston 14 .

[0028] Specifically, the pressure of the gas or liquid pushes the piston 14, causing the piston 14 to be displaced, thereby measuring the pressure, and the screw 15 can be rotated to adjust the length of the screw 15 on one side of the piston 14. When the pressure is too large, the screw 15 contacts the second limit plate 13 to limit the piston 14. At this time, the pressure detected by the ceramic pressure sensor 3 is fixed, thereby preventing the pressure from exceeding the detection range of the ceramic pressure sensor 3.

[0029] In addition, it should be understood that although the present specification is described according to implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment may also be appropriately combined to form other implementation modes that can be understood by those skilled in the art.

Claims

1. A ceramic pressure sensor packaging structure, comprising an upper shell (1) and a lower shell (2), characterized in that: A ceramic pressure sensor (3) is installed in the lower shell (2), a circuit board (5) is fixed on the ceramic pressure sensor (3), a sealing structure and a heat dissipation structure are installed between the ceramic pressure sensor (3) and the upper shell (1), a pressure port (10) and a connection port (11) are opened in the lower shell (2), a piston (14) is slidably fitted in the pressure port (10), and a limiting structure is installed in the pressure port (10), and the limiting structure corresponds to the piston (14).

2. The ceramic pressure sensor packaging structure according to claim 1, characterized in that: The upper shell (1) and the lower shell (2) are fixed by snapping.

3. The ceramic pressure sensor packaging structure according to claim 1, characterized in that: A mounting seat (4) is fixed inside the lower shell (2), and the mounting seat (4) corresponds to the ceramic pressure sensor (3).

4. The ceramic pressure sensor packaging structure according to claim 1, characterized in that: An output line (6) is fixed on the circuit board (5), and the circuit board (5) is fixed to the ceramic pressure sensor (3) by welding.

5. The ceramic pressure sensor packaging structure according to claim 1, characterized in that: The sealing structure comprises a sealing ring (7), and the sealing ring (7) is located between the ceramic pressure sensor (3) and the upper housing (1).

6. The ceramic pressure sensor packaging structure according to claim 5, characterized in that: The heat dissipation structure comprises a heat conducting block (8) and a heat dissipation block (9); the heat conducting block (8) is fixedly connected to the upper shell (1); the heat dissipation block (9) is fixedly connected to the lower shell (2); the sealing ring (7) is in contact with the heat conducting block (8); and the heat conducting block (8) is in contact with the heat dissipation block (9).

7. The ceramic pressure sensor packaging structure according to claim 1, characterized in that: The pressure port (10) is communicated with the connection port (11), and the limiting structure comprises a first limiting plate (12) and a second limiting plate (13).

8. The ceramic pressure sensor packaging structure according to claim 1, characterized in that: The piston (14) is threadedly engaged with a plurality of screw rods (15).

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