Dual-pressure differential pressure air inlet structure

By designing a dual-mode pressure differential air intake structure in the differential pressure sensor, and using a plastic bracket and a ceramic block to match the pressure-sensitive chip, the high cost and production difficulties caused by chip limitations in the prior art are solved, and efficient pressure differential detection and the effect of reducing production costs are achieved.

CN222866107UActive Publication Date: 2025-05-13HUASHIDE ELECTRONIC TECH (KUNSHAN) CO LTD
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Patent Information

Application Number
CN202421946315.0
Authority / Receiving Office
CN · China
Patent Type
Utility models(China)
Current Assignee / Owner
Filing Date
2024-08-13
Publication Date
2025-05-13
Estimated Expiration
2034-08-13

AI Technical Summary

Technical Problem

The existing pressure differential sensors require high-tech chips, which lead to high production costs and difficult chip procurement, resulting in high production difficulties and high costs.

Method used

A dual-mode pressure differential air intake structure is designed, and the plastic bracket and ceramic block are used to match the pressure sensitive chip to detect the pressure difference between the high-pressure intake pipe and the low-pressure intake pipe through the pressure difference detection of the low-pressure and high-pressure intake pipes.

Benefits of technology

It reduces production costs, avoids the problem of chip procurement difficulties, realizes efficient pressure differential detection, and is simple in structure design and easy to implement.

✦ Generated by Eureka AI based on patent content.

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Abstract

The utility model relates to a double-die differential pressure air inlet structure which comprises a shell, a first air inlet pipe, a second air inlet pipe, a second air inlet pipe and a third air inlet pipe. The cover plate covers the cavity I, and a cavity II is formed between the cover plate and the plastic bracket; the low-pressure air inlet pipe is communicated to the cavity II; a first ceramic block is arranged at the position, connected with the shell, of the high-pressure air inlet pipe, a first pressure-sensitive chip is arranged on the first ceramic block, a ceramic plate is arranged between the first pressure-sensitive chip and the plastic support, a second through hole is formed in the ceramic plate, and the first pressure-sensitive chip is used for detecting the pressure difference between the low pressure, introduced into the second through hole, of the low-pressure air inlet pipe and the high pressure in the high-pressure air inlet pipe. According to the dual-pressure differential pressure air inlet structure, the plastic bracket is arranged, so that the low-pressure cavity communicated with the low-pressure air inlet pipe can be formed between the plastic bracket and the shell, and high pressure at one end of the high-pressure air inlet pipe is matched to act on two sides of the pressure-sensitive chip I respectively; therefore, the pressure difference value between the high-pressure air inlet pipe and the low-pressure air inlet pipe is detected.
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Description

Technical Field

[0001] The utility model relates to the technical field of sensors, in particular to a dual-mode pressure difference air 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. The differential pressure sensor shell is a plastic structure. The two pressure interfaces are hose clip connection structures. The differential pressure sensor usually consists of a pressure sensing element, a signal conditioner and a shell. The pressure sensing element measures the pressure difference between two positions and conditions the electrical signals of these pressure differences into the signals we need.

[0003] The working principle of the differential pressure sensor is based on measuring the pressure difference between different locations. When there is a pressure difference between two locations, the sensor will detect this difference and output a corresponding electrical signal or digital signal.

[0004] In one type of differential pressure sensor, it is necessary to test the high-pressure intake pipe pressure and the pressure difference between the high-pressure intake pipe and the low-pressure intake pipe. The original structure needs to add high-tech chips to achieve this. The price is high and the chips are difficult to purchase. Therefore, this type of differential pressure sensor is not only difficult to produce, but also has high costs. Utility Model Content

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the pressure difference sensor needs to be produced at a relatively high cost due to the limitation of the chip.

[0006] To solve the above technical problems, the utility model provides a dual-mode pressure difference air intake structure, comprising: a shell, in which a cavity 1 is provided, a plastic bracket is provided in the cavity 1, and a through hole 1 is provided on the plastic bracket; a cover plate, which is arranged on the shell, and the cover plate covers the cavity 1, and a cavity 2 is formed between the cover plate and the plastic bracket; a low-pressure air intake pipe, which is connected to the shell, and the low-pressure air intake pipe is connected to the cavity 2; a high-pressure air intake pipe, which is connected to the shell, and a ceramic block 1 is provided at the connection position between the high-pressure air intake pipe and the shell, a pressure-sensitive chip 1 is provided on the ceramic block 1, a ceramic plate is provided between the pressure-sensitive chip 1 and the plastic bracket, and a through hole 2 is provided on the ceramic plate, the through hole 2 is connected to the cavity 2 through the through hole 1, and the pressure-sensitive chip 1 is used to detect the pressure difference between the low pressure in the low-pressure air intake pipe entering the through hole 2 and the high pressure in the high-pressure air intake pipe.

[0007] In an embodiment of the utility model, a through hole three is provided on the plastic bracket, and the low-pressure air inlet pipe is connected with the cavity two through the through hole three.

[0008] In one embodiment of the utility model, a low-pressure branch air intake pipe is provided at one end of the low-pressure air intake pipe close to the shell, and the low-pressure branch air intake pipe is connected to the through hole three.

[0009] In one embodiment of the utility model, a high-pressure air inlet is provided at the connection position between the high-pressure air inlet pipe and the shell, the ceramic block cover is provided at the position of the high-pressure air inlet, and the pressure-sensitive chip is provided opposite to the high-pressure air inlet.

[0010] In one embodiment of the utility model, a boss 1 is provided on the inner wall of the high-pressure air inlet pipe, and the boss 1 and the high-pressure air inlet are on the same straight line.

[0011] In one embodiment of the utility model, a through hole four is provided at the position of the shell where the cavity one is located, and the through hole four is connected to the cavity one through the gap between the cover plate and the shell, and the air pressure in the cavity one is atmospheric pressure.

[0012] In one embodiment of the utility model, a low-pressure air inlet is provided at the connection position between the low-pressure air inlet pipe and the shell, and a ceramic block 2 is provided on the shell at the position of the low-pressure air inlet. A pressure-sensitive chip 2 is provided on the ceramic block 2, and the pressure-sensitive chip 2 is used to detect the pressure difference between the low pressure in the low-pressure air inlet pipe and the atmospheric pressure in the cavity 1.

[0013] In one embodiment of the utility model, a second boss is provided on the inner wall of the low-pressure air inlet pipe, and the second boss is on the same straight line as the low-pressure air inlet.

[0014] In an embodiment of the utility model, a PCB board is provided in the cavity one, and a through hole five is provided at a position where the PCB board and the pressure-sensitive chip two face each other.

[0015] In one embodiment of the utility model, a conical groove is provided at one end of the through hole 1 close to the ceramic plate, and the through hole 2 is connected to the conical groove.

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

[0017] The dual-mode pressure difference air intake structure described in the utility model can form a low-pressure cavity connected to the low-pressure air intake pipe between the plastic bracket and the shell through the arrangement of the plastic bracket, and the high pressure at one end of the high-pressure air intake pipe acts on the two sides of the pressure sensitive chip one, thereby detecting the pressure difference between the high-pressure air intake pipe and the low-pressure air intake pipe; the design of dividing the low-pressure air intake pipe into two low-pressure paths can test the pressure difference between one low-pressure path and the high-pressure path, and test the pressure difference between the other low-pressure path and the atmospheric pressure of the cavity one. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to make the content of the utility model easier to understand, the utility model is further described in detail according to the specific embodiments of the utility model in combination with the accompanying drawings, wherein

[0019] Figure 1 This is a schematic diagram of the appearance structure of the dual-mode pressure difference air intake structure in the preferred embodiment of the utility model;

[0020] Figure 2 This is a structural schematic diagram of a dual-mode pressure difference air intake structure in a preferred embodiment of the utility model;

[0021] Figure 3 It is a cross-sectional view of a dual-mode pressure difference air intake structure in a preferred embodiment of the utility model;

[0022] Figure 4 The schematic diagram of the partial structure of the dual-mode pressure difference air intake structure in the preferred embodiment of the utility model is as follows: Figure 1 ;

[0023] Figure 5 The schematic diagram of the partial structure of the dual-mode pressure difference air intake structure in the preferred embodiment of the utility model is as follows: Figure 2 .

[0024] Explanation of the markings in the specification: shell 1, cavity 11, plastic bracket 12, through hole three 121, sealing ring mounting groove 122, through hole one 13, conical groove 131, through hole four 14, cover plate 2, cavity two 21, low-pressure air inlet pipe 3, low-pressure branch air inlet pipe 31, inclined surface one 311, low-pressure air inlet port 32, boss two 33, inclined surface three 331, high-pressure air inlet pipe 4, high-pressure air inlet port 41, boss one 42, inclined surface two 421, ceramic block one 5, pressure-sensitive chip one 6, ceramic board 7, through hole two 71, ceramic block two 8, pressure-sensitive chip two 9, PCB board 10, through hole five 101. DETAILED DESCRIPTION

[0025] The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments so that those skilled in the art can better understand the present invention and implement it, but the embodiments are not intended to limit the present invention.

[0026] Reference Figure 1-3As shown, the dual-mode pressure difference air intake structure of the utility model comprises: a shell 1, a cover plate 2, a low-pressure air intake pipe 3 and a high-pressure air intake pipe 4; the shell 1 is provided with a cavity 11, the cavity 11 is provided with a plastic bracket 12, and the plastic bracket 12 is provided with a through hole 13; the cover plate 2 is arranged on the shell 1, and the cover plate 2 covers the cavity 11, and a cavity 21 is formed between the cover plate 2 and the plastic bracket 12; the low-pressure air intake pipe 3 is connected to the shell 1, and the low-pressure air intake pipe 5 is connected to the low-pressure air intake pipe 5; To cavity two 21; a high-pressure intake pipe 4, which is connected to the shell 1, and a ceramic block 5 is provided at the connection position between the high-pressure intake pipe 4 and the shell 1, and a pressure-sensitive chip 6 is provided on the ceramic block 5, and a ceramic plate 7 is provided between the pressure-sensitive chip 6 and the plastic bracket 12, and a through hole two 71 is provided on the ceramic plate 7, and the through hole two 71 is connected with the cavity two 21 through the through hole one 13, and the pressure-sensitive chip 6 is used to detect the pressure difference between the low pressure in the low-pressure intake pipe 3 entering the through hole two 71 and the high pressure in the high-pressure intake pipe 4.

[0027] In the above structure, the plastic bracket 12 is provided with a through hole 3 121, and the low-pressure air inlet pipe 3 is connected to the cavity 21 through the through hole 3 121. The low-pressure gas entering through the low-pressure air inlet pipe 3 enters the cavity 21 through the through hole 3 121, thereby forming a low-pressure environment in the cavity 21.

[0028] In the above structure, a low-pressure branch air intake pipe 31 is provided at one end of the low-pressure air intake pipe 3 close to the housing 1, and the low-pressure branch air intake pipe 31 is connected to the through hole 3 121. An inclined surface 1 311 is provided at one end of the low-pressure branch air intake pipe 3 close to the low-pressure air intake pipe 3, and the inclined surface 1 311 is used to buffer the low-pressure gas from the low-pressure air intake pipe 3 into the low-pressure branch air intake pipe 31.

[0029] Reference Figure 4 As shown, a high-pressure air inlet 41 is provided at the connection position between the high-pressure air inlet pipe 4 and the housing 1, the ceramic block 5 is provided at the position of the high-pressure air inlet 41, and the pressure-sensitive chip 6 is arranged opposite to the high-pressure air inlet 41. A boss 42 is provided on the inner wall of the high-pressure air inlet pipe 4, and the boss 42 and the high-pressure air inlet 41 are on the same straight line. The end face of the boss 42 close to the high-pressure air inlet 41 is set as an inclined surface 421, and the inclined surface 421 is used for buffering and guiding the high-pressure gas from the high-pressure air inlet pipe 4 into the high-pressure air inlet 41 to prevent the high-pressure gas from directly impacting the pressure-sensitive chip 6. Since the high-pressure gas contains solid particles, directly impacting the pressure-sensitive chip 6 is likely to cause damage to the pressure-sensitive chip 6.

[0030] The above is the first pressure difference measurement position of the dual-mode pressure difference air intake structure. The second pressure difference measurement structure of the dual-mode pressure difference air intake structure of the utility model is as follows.

[0031] First, a through hole 4 14 is provided at the position of the shell 1 where the cavity 11 is located. The through hole 4 14 is connected to the cavity 11 through the gap between the cover plate 2 and the shell, and the air pressure in the cavity 11 is atmospheric pressure.

[0032] Reference Figure 5 As shown, a low-pressure air inlet 32 ​​is provided at the connection position between the low-pressure air inlet pipe 3 and the shell 1, and a ceramic block 28 is provided at the shell 1 at the position of the low-pressure air inlet 32. A pressure-sensitive chip 29 is provided on the ceramic block 28, and the pressure-sensitive chip 29 is used to detect the pressure difference between the low pressure in the low-pressure air inlet pipe 3 and the atmospheric pressure in the cavity 11. A boss 233 is provided on the inner wall of the low-pressure air inlet pipe 3, and the boss 233 is on the same straight line as the low-pressure air inlet 32. The end face of the boss 233 close to the side of the low-pressure air inlet 32 ​​is set as an inclined surface 331, and the inclined surface 331 is used to buffer and guide the low-pressure gas from the low-pressure air inlet pipe 3 into the low-pressure air inlet 32, so as to avoid the low-pressure gas from directly impacting the pressure-sensitive chip 29. Since the low-pressure gas contains solid particles, direct impact on the pressure-sensitive chip 29 is likely to cause damage to the pressure-sensitive chip 29.

[0033] In the above structure, the PCB board 10 is arranged in the cavity 11, and the through hole 5 101 is arranged at the position where the PCB board 10 is directly opposite to the pressure sensitive chip 2 9. The through hole 5 101 is connected with the cavity 1 11, so the position of the through hole 5 101 is atmospheric pressure. Therefore, the upper and lower surfaces of the pressure sensitive chip 2 9 are respectively atmospheric pressure and low pressure, and the pressure sensitive chip 2 9 is used to detect the pressure difference.

[0034] In the above structure, a conical groove 131 is provided at one end of the through hole 13 close to the ceramic plate 7, and the through hole 2 71 is connected to the conical groove 131. The conical groove 131 increases the gas storage space at the low-pressure air inlet end, so that the low-pressure gas entering the low-pressure air inlet pipe 3 can pass through the cavity 2 21 and the through hole 1 13 and converge in the conical groove 131, and can store a certain amount of low-pressure gas and high-pressure gas entering the high-pressure air inlet pipe 4 to act on the pressure-sensitive chip 1 6 respectively. A sealing ring installation groove 122 is provided on the end surface of the plastic bracket 12 that contacts the ceramic plate 7, and a sealing ring is provided in the sealing ring installation groove 122. The conical groove 131 is located within the range surrounded by the sealing ring, and the conical groove 131 is sealed by the sealing ring, thereby preventing the low-pressure gas in the conical groove 131 from leaking.

[0035] In the above structure, the connection positions between the cover plate 2 and the plastic bracket 12, and between the plastic bracket 12 and the shell 1 are all set as sealing structures, so that the cavity 21 can be a sealed cavity, which can form a low-pressure environment after the low-pressure air intake pipe 3 enters the low-pressure gas.

[0036] In the above structure, the connection positions between ceramic block 1 5 and shell 1 are set as sealing structures to ensure that the high-pressure gas entering through the high-pressure air inlet 41 will not leak. Similarly, the connection positions between ceramic block 2 8 and shell 1 are also set as sealing structures to ensure that the low-pressure gas entering through the low-pressure air inlet 32 ​​will not leak. Preferably, the sealing between ceramic block 1 5 and ceramic block 2 8 and shell 1 can be achieved by resin potting.

[0037] Obviously, the above embodiments are merely examples for the purpose of clear explanation and are not intended to limit the implementation methods. For those skilled 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 list all the implementation methods here. The obvious changes or modifications derived from these are still within the scope of protection of the invention of the utility model.

Claims

1. A dual-mode pressure differential air intake structure, characterized in that: include, A shell, wherein a cavity 1 is provided therein, a plastic bracket is provided in the cavity 1, and a through hole 1 is provided on the plastic bracket; A cover plate is arranged on the housing and covers the first cavity, and a second cavity is formed between the cover plate and the plastic bracket; A low-pressure air inlet pipe is connected to the shell and communicated with the second cavity; A high-pressure intake pipe is connected to the shell, and a ceramic block 1 is provided at the connection position between the high-pressure intake pipe and the shell, a pressure-sensitive chip 1 is provided on the ceramic block 1, a ceramic plate is provided between the pressure-sensitive chip 1 and the plastic bracket, a through hole 2 is provided on the ceramic plate, and the through hole 2 is connected to the cavity 2 through the through hole 1. The pressure-sensitive chip 1 is used to detect the pressure difference between the low pressure in the low-pressure intake pipe entering the through hole 2 and the high pressure in the high-pressure intake pipe.

2. The dual-mode pressure difference air intake structure according to claim 1, characterized in that: The plastic support is provided with a third through hole, and the low-pressure air intake pipe is connected with the cavity two through the third through hole.

3. The dual-mode pressure difference air intake structure according to claim 2, characterized in that: A low-pressure branch air intake pipe is provided at one end of the low-pressure air intake pipe close to the shell, and the low-pressure branch air intake pipe is connected to the through hole three.

4. The dual-mode pressure difference air intake structure according to claim 1, characterized in that: A high-pressure air inlet is provided at the connection position between the high-pressure air inlet pipe and the shell, the ceramic block cover is arranged at the position of the high-pressure air inlet, and the pressure-sensitive chip is arranged opposite to the high-pressure air inlet.

5. The dual-mode pressure difference air intake structure according to claim 4, characterized in that: A boss 1 is provided on the inner wall of the high-pressure air inlet pipe, and the boss 1 and the high-pressure air inlet are on the same straight line.

6. The dual-mode pressure difference air intake structure according to claim 1, characterized in that: A through hole four is provided at the position of the shell where the cavity one is located. The through hole four is connected to the cavity one through the gap between the cover plate and the shell. The air pressure in the cavity one is atmospheric pressure.

7. The dual-mode pressure difference air intake structure according to claim 6, characterized in that: A low-pressure air inlet is provided at the connection position between the low-pressure air inlet pipe and the shell, and a ceramic block 2 is provided on the shell at the position of the low-pressure air inlet. A pressure-sensitive chip 2 is provided on the ceramic block 2, and the pressure-sensitive chip 2 is used to detect the pressure difference between the low pressure in the low-pressure air inlet pipe and the atmospheric pressure in the cavity 1.

8. The dual-mode pressure difference air intake structure according to claim 7, characterized in that: A second boss is provided on the inner wall of the low-pressure air inlet pipe, and the second boss is on the same straight line as the low-pressure air inlet.

9. The dual-mode pressure difference air intake structure according to claim 8, characterized in that: A PCB board is arranged in the cavity one, and a through hole five is arranged at a position where the PCB board and the pressure-sensitive chip two face each other.

10. The dual-mode pressure difference air intake structure according to claim 1, characterized in that: A conical groove is arranged at one end of the through hole 1 close to the ceramic plate, and the through hole 2 is communicated with the conical groove.