Differential pressure air inlet structure

Abstract

The utility model relates to a differential pressure air inlet structure, which comprises a sensor shell, a pressure sensor, a pressure sensor and a pressure sensor, the circuit board is fixedly arranged in the cavity; a ceramic block I is arranged at the port position, directly facing the circuit board, of the air inlet pipe I, a through hole I is formed in the ceramic block I, and air in the air inlet pipe I acts on the circuit board through the through hole I; a second ceramic block is arranged at the position of a port, right opposite to the circuit board, of the second air inlet pipe, a second through hole is formed in the second ceramic block, and air in the second air inlet pipe acts on the circuit board through the second through hole. According to the differential pressure air inlet structure, the ceramic blocks used for buffering air flow are additionally arranged at the air inlet ports, opposite to the circuit board, of the first air inlet pipe and the second air inlet pipe, so that impact of sewage and waste mixed particles can be isolated under the condition that the use environment is severe, the service life of a differential pressure sensor is prolonged, and the service life of the differential pressure sensor is prolonged. And product scrap is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of differential pressure sensors, in particular to a differential pressure intake structure. Background Art

[0002] A differential pressure sensor is a sensor used to measure the difference between two pressures. It is usually used to measure the pressure difference between the front and rear ends of a device or component.

[0003] The commonly used differential pressure sensor includes a housing, in which cavities are provided which are connected to two air intake pipes respectively. The two cavities are isolated by a PCB circuit board, and a sensitive part is provided on the PCB circuit board for sensing the pressure difference between the two cavities. When the differential pressure sensor is used, it is installed through the mounting holes provided on the housing in conjunction with fasteners. Its working principle is that the gas forms a pressure difference in two relatively sealed cavities. This pressure difference directly acts on the sensitive part of the sensor, causing the sensitive part to produce a small displacement proportional to the air pressure, thereby causing the resistance value in the sensor circuit to change. The electronic circuit detects this voltage change, and converts and outputs a standard measurement signal corresponding to the pressure and transmits it to the ECU, which analyzes, processes and outputs it.

[0004] However, due to the harsh operating environment at the ends of the two intake pipes, sewage and waste particles may cause irreversible impact on the chip structure, resulting in damage to the pressure difference chip. Utility Model Content

[0005] Therefore, the technical problem to be solved by the utility model is to overcome the problem that the air intake structure of the pressure difference sensor in the prior art is direct air intake, and the incoming gas will directly impact the chip, which is easy to cause damage to the chip.

[0006] To solve the above technical problems, the utility model provides a pressure difference air intake structure, including: a sensor housing, which is provided with a cavity inside; a circuit board, which is fixedly arranged inside the cavity; an air intake pipe 1, which is arranged on the sensor housing and connected to the cavity, and the end of the air intake pipe 1 extending into the cavity is arranged opposite to the circuit board, and a ceramic block 1 is arranged at the port position of the air intake pipe 1 opposite to the circuit board, and a through hole 1 is arranged on the ceramic block 1, and the gas in the air intake pipe 1 acts on the circuit board through the through hole 1; an air intake pipe 2, which is arranged on the sensor housing and connected to the cavity, and the end of the air intake pipe 2 extending into the cavity is arranged opposite to the circuit board, and a ceramic block 2 is arranged at the port position of the air intake pipe 2 opposite to the circuit board, and a through hole 2 is arranged on the ceramic block 2, and the gas in the air intake pipe 2 acts on the circuit board through the through hole 2.

[0007] In one embodiment of the utility model, an opening 1 is provided at a position of the sensor housing directly facing the circuit board, and a cover plate is provided at the position of the opening 1.

[0008] In one embodiment of the utility model, an air inlet port 1 is provided at the connection position between the air inlet pipe 1 and the sensor housing, and the air inlet pipe 1 is connected to the cavity through the air inlet port 1 and the through hole 1.

[0009] In one embodiment of the utility model, an annular protrusion one is provided on one side of the air inlet one located in the cavity, an annular protrusion two is provided on the inner wall of the cavity, the annular protrusion one is located within the range surrounded by the annular protrusion two, and an annular groove one is formed between the outer wall of the annular protrusion one and the inner wall of the annular protrusion two, and the ceramic block one is placed in the annular groove one.

[0010] In an embodiment of the utility model, a boss 1 is provided on the inner wall of the air inlet pipe 1, and the boss 1 is on the same straight line as the air inlet 1.

[0011] In an embodiment of the utility model, an inclined surface 1 is provided on the end surface of the boss 1 that faces the air inlet 1.

[0012] In one embodiment of the utility model, an air inlet port 2 is provided at the connection position between the air inlet pipe 2 and the sensor housing, and the air inlet pipe 2 is connected to the cavity through the air inlet port 2 and the through hole 1.

[0013] In one embodiment of the utility model, an annular protrusion three is provided on one side of the air inlet two located in the cavity, an annular protrusion four is provided on the inner wall of the cavity, the annular protrusion three is located within the range surrounded by the annular protrusion four, and an annular groove two is formed between the outer wall of the annular protrusion three and the inner wall of the annular protrusion four, and the ceramic block two is placed in the annular groove two.

[0014] In an embodiment of the utility model, a second boss is provided on the inner wall of the second air inlet pipe, and the second boss is on the same straight line as the second air inlet.

[0015] In an embodiment of the present utility model, a second inclined surface is provided on the end surface of the second boss directly facing the second air inlet.

[0016] The above technical solution of the utility model has the following beneficial effects compared with the prior art:

[0017] The pressure difference air intake structure described in the utility model increases ceramic blocks for buffering airflow at the positions of the air intake ports of the air intake pipes one and two relative to the circuit board, and can isolate the impact of sewage and waste mixed particles under harsh operating environments, thereby extending the service life of the pressure difference sensor and reducing product scrapping. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] To make the content of the present utility model easier to be clearly understood, the following further details the present utility model according to specific embodiments of the present utility model in conjunction with the drawings, wherein

[0019] Figure 1 is a schematic external structure diagram of the differential pressure air intake structure in the preferred embodiment of the present utility model;

[0020] Figure 2 is a sectional view of the differential pressure air intake structure in the preferred embodiment of the present utility model;

[0021] Figure 3 is a partial enlarged view of the differential pressure air intake structure in the preferred embodiment of the present utility model.

[0022] Explanation of the reference numerals in the drawings of the specification: sensor housing 1, cavity 11, first opening 12, first air inlet 13, first annular convex portion 14, second annular convex portion 15, first annular groove 16, second air inlet 17, third annular convex portion 18, fourth annular convex portion 19, second annular groove 110, circuit board 2, first intake pipe 3, first boss 31, first inclined surface 311, second intake pipe 4, second boss 41, second inclined surface 411, first ceramic block 5, first through hole 51, base 52, rectangular piece 53, second ceramic block 6, second through hole 61, cover plate 7. Specific embodiments

[0023] The following further illustrates the present utility model in conjunction with the drawings and specific embodiments, so that those skilled in the art can better understand the present utility model and be able to implement it, but the embodiments cited are not intended to limit the present utility model.

[0024] Refer to Figure 1 、 2As shown in the figure, the differential pressure intake structure of the present utility model includes: a sensor housing 1, a circuit board 2, an intake pipe 1 3, and an intake pipe 2 4; the sensor housing 1 has a cavity 11 inside; the circuit board 2 is fixedly arranged inside the cavity 11; the intake pipe 1 3 is arranged on the sensor housing 1 and the intake pipe 1 3 communicates with the cavity 11. The end of the intake pipe 1 3 extending into the cavity 11 is arranged opposite to the circuit board 2. At the position of the port of the intake pipe 1 3 opposite to the circuit board 2, there is a ceramic block 1 5, and there is a through hole 1 51 on the ceramic block 1 5. The gas in the intake pipe 1 3 acts on the circuit board 2 through the through hole 1 51; the intake pipe 2 4 is arranged on the sensor housing 1 and the intake pipe 2 4 communicates with the cavity 11. The end of the intake pipe 2 4 extending into the cavity 11 is arranged opposite to the circuit board 2. At the position of the port of the intake pipe 2 4 opposite to the circuit board 2, there is a ceramic block 2 6, and there is a through hole 2 61 on the ceramic block 2 6. The gas in the intake pipe 2 4 acts on the circuit board 2 through the through hole 2 61. The intake pipe 1 3 and the intake pipe 2 4 are two parallel circular pipes, and the cavity 11 is inflated through the intake pipe 1 3 and the intake pipe 2 4 respectively.

[0025] In the above structure, there is an opening 1 12 at the position of the sensor housing 1 opposite to the circuit board 2, and a cover plate 7 is covered at the position of the opening 1 12. Through the arranged cover plate 7, it is convenient to inspect the inside of the cavity 11.

[0026] In the above structure, there is an intake port 1 13 at the connection position of the intake pipe 1 3 and the sensor housing 1, and the intake pipe 1 3 communicates with the cavity 11 through the intake port 1 13 and the through hole 1 51. The intake port 1 13 is eccentrically arranged within the circular cross-section range of the intake pipe 1 3 and is not located at the center of the circular cross-section of the intake pipe 1 3.

[0027] In the above structure, there is a ring-shaped convex part 1 14 on one side of the intake port 1 13 located inside the cavity 11, and there is a ring-shaped convex part 2 15 on the inner wall of the cavity 11. The ring-shaped convex part 1 14 is located within the range surrounded by the ring-shaped convex part 2 15, and there is a ring-shaped groove 1 16 between the outer wall of the ring-shaped convex part 1 14 and the inner wall of the ring-shaped convex part 2 15. The ceramic block 1 5 is placed in the ring-shaped groove 1 16. The ceramic block 1 5 can be positioned and installed through the ring-shaped convex part 1 14 and the ring-shaped convex part 2 15.

[0028] Refer to Figure 3 As shown in the figure, there is a convex platform 1 31 on the inner wall of the intake pipe 1 3, and the convex platform 1 31 is on the same straight line as the intake port 1 13. There is an inclined surface 1 311 on the end surface of the convex platform 1 31 opposite to the intake port 1 13. Through the arranged convex platform 1 31, an air flow blocking structure can be formed in the intake pipe 1 3 to prevent the air flow from directly blowing onto the circuit board 2 through the intake port 1 13 and the through hole 1 51.

[0029] The structural principle of the second intake pipe 4 is the same as that of the first intake pipe 3.

[0030] In the above structure, an intake port two 17 is provided at the connection position between the second intake pipe 4 and the sensor housing 1. The second intake pipe 4 communicates with the cavity 11 through the intake port two 17 and the through hole one 51. An annular convex part three 18 is provided on one side of the intake port two 17 located inside the cavity 11. An annular convex part four 19 is provided on the inner wall of the cavity 11. The annular convex part three 18 is located within the range surrounded by the annular convex part four 19, and an annular groove two 110 is formed between the outer wall of the annular convex part three 18 and the inner wall of the annular convex part four 19. The ceramic block two 6 is placed in the annular groove two 110.

[0031] Refer to Figure 3 As shown, a boss two 41 is provided on the inner wall of the second intake pipe 4. The boss two 41 is on the same straight line as the intake port two 17. An inclined surface two 411 is provided on the end surface of the boss two 41 facing the intake port two 17.

[0032] In the above structure, the ceramic block one 5 and the ceramic block two 6 have the same structure, both including a base 52 and a rectangular sheet 53. The base 52 is a rectangular block, and a through hole penetrating two opposite end faces is provided at the center of the base 52. The base 52 is placed in the annular groove one 16 and the annular groove two 110, and is resin-sealed between the base 52 and the annular groove one 16, and between the base 52 and the annular groove two 110. The rectangular sheet 53 is fixedly connected to the end of the base 52 extending out of the annular groove one 16 and the annular groove two 110, and through holes one 51 and two 61 are provided on the rectangular sheet 53.

[0033] Obviously, the above embodiments are only examples given for clear illustration and are not limitations on the implementation manners. For those of ordinary skill in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to enumerate all the implementation manners here. And the obvious changes or modifications derived therefrom are still within the protection scope of the present invention.

Claims

1. A differential pressure intake structure, characterized in that: Including, a sensor housing with a cavity inside; a circuit board fixedly arranged inside the cavity; a first intake pipe arranged on the sensor housing and communicating with the cavity. The end of the first intake pipe extending into the cavity is arranged opposite to the circuit board. A first ceramic block is provided at the port position of the first intake pipe opposite to the circuit board. A first through hole is provided on the first ceramic block. The gas in the first intake pipe acts on the circuit board through the first through hole. An intake port one is provided at the connection position of the first intake pipe and the sensor housing. The first intake pipe communicates with the cavity through the intake port one and the first through hole. A first annular convex part is provided on one side of the intake port one located inside the cavity. A second annular convex part is provided on the inner wall of the cavity. The first annular convex part is within the range surrounded by the second annular convex part. An annular groove one is formed between the outer wall of the first annular convex part and the inner wall of the second annular convex part. The first ceramic block is placed in the annular groove one. A first boss is provided on the inner wall of the first intake pipe. The first boss is on the same straight line as the intake port one. An inclined surface one is provided on the end face of the first boss opposite to the intake port one; a second intake pipe arranged on the sensor housing and communicating with the cavity. The end of the second intake pipe extending into the cavity is arranged opposite to the circuit board. A second ceramic block is provided at the port position of the second intake pipe opposite to the circuit board. A second through hole is provided on the second ceramic block. The gas in the second intake pipe acts on the circuit board through the second through hole. A second boss is provided on the inner wall of the second intake pipe. The second boss is on the same straight line as the intake port two. An inclined surface two is provided on the end face of the second boss opposite to the intake port two.

2. The differential pressure air intake structure according to claim 1, wherein: An opening one is provided at the position of the sensor housing opposite to the circuit board. A cover plate is covered at the position of the opening one.

3. The differential pressure air intake structure according to claim 1, wherein: An intake port two is provided at the connection position of the second intake pipe and the sensor housing. The second intake pipe communicates with the cavity through the intake port two and the first through hole.

4. The differential pressure air intake structure according to claim 3, wherein: A third annular convex part is provided on one side of the intake port two located inside the cavity. A fourth annular convex part is provided on the inner wall of the cavity. The third annular convex part is within the range surrounded by the fourth annular convex part. An annular groove two is formed between the outer wall of the third annular convex part and the inner wall of the fourth annular convex part. The second ceramic block is placed in the annular groove two.

Images