CN217176768U

CN217176768U - Differential pressure sensor

Info

Publication number: CN217176768U
Application number: CN202220634286.9U
Authority: CN
Inventors: 潘畅; 吴娟; 周卫卫
Original assignee: Chery Automobile Co Ltd
Current assignee: Chery Automobile Co Ltd
Priority date: 2022-03-22
Filing date: 2022-03-22
Publication date: 2022-08-12
Anticipated expiration: 2032-03-22

Abstract

The utility model aims at providing a pressure differential sensor that intensity is high, reduce fracture risk is provided with the electronic module subassembly in the casing, the protruding connecting pipe that stretches to be provided with two communicating parallel arrangement of casing inner chamber of casing, the connecting pipe in inlay and have the tubular metal resonator. In the above scheme, the metal pipe is embedded into the plastic wall of the connecting pipe during injection molding of the shell, so that the strength of the differential pressure sensor shell and the connecting pipe is enhanced, and the fracture risk is reduced.

Description

Differential pressure sensor

Technical Field

The utility model relates to an automobile engine sensor technical field, concretely relates to pressure differential sensor.

Background

With the implementation of the national six-emission regulations, the limit of particulate matter emission of gasoline engines reaches a very high requirement, so that it is increasingly necessary to adopt effective after-treatment purification devices, and a particulate trap (GPF) is the most common after-treatment technology for treating PM emission. Meanwhile, an exhaust gas recirculation system (EGR for short) is used more and more frequently, exhaust gas in an exhaust pipe of the engine enters an air inlet system of the engine after being cooled by a related pipeline and a cooler through an EGR valve, so that the exhaust gas is mixed with air and is combusted in a cylinder combustion chamber again, the formation of nitrogen oxides in the exhaust gas of the engine is effectively inhibited, and the exhaust emission effect of the engine is reduced. In the application process of the GPF post-processing device and the exhaust gas recirculation system, pressure changes of the particle trap and the EGR valve in the front and back directions need to be fed back and monitored to the ECU control unit through a pressure difference sensor, and therefore the ECU can effectively recognize, judge and control the particle trap and the EGR valve to work normally.

In the prior art, a shell of the differential pressure sensor is provided with a double-connecting pipe, the double-connecting pipe is connected with a gas collecting point through another intermediate pipeline, the other intermediate pipeline generally comprises a section of metal pipe and a section of rubber pipe, the metal pipe is directly integrated with a part at the gas collecting position, one end of the rubber pipe is connected with the metal pipe, and the other end of the rubber pipe is connected with a port of the differential pressure sensor double-connecting pipe. During the use, gather gaseous temperature and probably too high lead to the sensor can't bear the damage, and the intermediate line that uses between differential pressure sensor and the collection point is longer, considers whole car when low temperature environment work simultaneously, and the frozen pipeline of blocking of intermediate line steam condensation, differential pressure sensor arranges and the gas acquisition is located far away. The intermediate pipe arrangement has limitations, the intermediate pipe may have fewer fixed points, and thus the differential pressure sensor double-connection pipe orifice bears larger mass from the intermediate pipe. The pressure difference sensor can be a plastic part made of a single material generally, brittleness is increased at low temperature, when the whole vehicle runs under poor road conditions, the double connecting pipes of the pressure difference sensor can not bear larger stress caused by severe vibration, and a fracture risk exists, particularly at the position of stress concentration at the joint of the root of the double connecting pipe and the shell body.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a differential pressure sensor that intensity is high, reduce the fracture risk.

In order to realize the purpose, the utility model discloses a technical scheme be: the pressure difference sensor comprises a shell, wherein an electronic module assembly is arranged in the shell, two connecting pipes which are communicated with an inner cavity of the shell and are arranged in parallel are convexly arranged on the shell, and metal pipes are embedded in the connecting pipes.

In the above scheme, the metal pipe is embedded into the plastic wall of the connecting pipe during injection molding of the shell, so that the strength of the differential pressure sensor shell and the connecting pipe is enhanced, and the fracture risk is reduced.

Drawings

FIG. 1 is an exploded view of a differential pressure sensor;

fig. 2 is a sectional view of the differential pressure sensor.

Detailed Description

As shown in fig. 1 and 2, the differential pressure sensor includes a housing 10, an electronic module assembly 50 is disposed in the housing 10, two parallel connection pipes 11 are convexly disposed on the housing 10 and communicated with an inner cavity of the housing 10, and a metal pipe 20 is embedded in the connection pipes 11. Because the double-connecting-pipe orifice of the differential pressure sensor bears larger mass from the middle pipeline, the metal pipe is embedded into the plastic wall of the connecting pipe 11 when the shell 10 is subjected to injection molding, so that the strength of the shell 10 and the connecting pipe 11 of the differential pressure sensor is enhanced, and the fracture risk is reduced.

As the preferred scheme of the utility model, tubular metal resonator 20 include bottom plate 21, the protruding sleeve pipe 22 that is provided with two parallel arrangement of protruding the stretching of one side face of bottom plate 21, two sleeve pipes 22 are arranged with two connecting pipe 11 position one-to-one respectively. Because when the weight from the middle pipeline that connecting pipe 11 bore, the stress concentration position is connecting pipe root 11 and casing 10 main part junction, consequently set up tubular metal resonator 20 to a bottom plate 21 and add the structure of two sleeve pipes 22, can strengthen the intensity of connecting pipe root 11 and casing 10 main part junction on the one hand, on the other hand three parts are moulded plastics inside casing 10 as a whole, convenient location, conveniently moulds plastics.

In order to enable the metal tube 20 to be located completely inside the housing 10, the thickness of the bottom plate 21 is smaller than the wall thickness of the housing 10 at the location of the connection tube 11, the outer diameter of the sleeve 22 is smaller than the outer diameter of the connection tube 11 and the inner diameter of the sleeve 22 is larger than the inner diameter of the connection tube 11. The metal pipe 20 is completely invisible from the outside of the housing 10, so that the aesthetic appearance of the housing 10 is ensured, and the metal pipe 20 is prevented from being exposed to the outside and rusted.

Further, the cores of the two sleeves 22 coincide with the cores of the corresponding connection tubes 11.

The connection pipe 11 and the metal pipe 20 are disposed at a lower position of the housing 10, and a plug 12, a stopper (not shown in the figure, in fig. 2, the back of the housing 10) for preventing the differential pressure sensor from rotating and mounting the bracket 14 are further disposed on the outer wall of the periphery of the housing 10.

The upper portion of the housing 10 is open, the opening is provided with a cover plate 30 for easy assembly, and a sealing ring 40 is provided between the electronic module assembly 50 and the inner wall of the housing 10 to prevent water vapor from entering the housing 10.

Further, the housing 10 and the metal pipe 20 are injection molded to form an integral structure.

Claims

1. The utility model provides a differential pressure sensor, includes casing (10), is provided with electronic module subassembly (50) in casing (10), and casing (10) are protruding to be provided with casing (10) inner chamber communicating two parallel arrangement's connecting pipe (11), its characterized in that: and a metal pipe (20) is embedded in the connecting pipe (11).

2. The differential pressure sensor as recited in claim 1, wherein: the metal pipe (20) comprises a bottom plate (21), two parallel sleeves (22) are convexly arranged on the surface of one side of the bottom plate (21), and the two sleeves (22) are respectively arranged in one-to-one correspondence with the positions of the two connecting pipes (11).

3. The differential pressure sensor as recited in claim 2, wherein: the thickness of the bottom plate (21) is smaller than the wall thickness of the shell (10) at the position of the connecting pipe (11), the outer diameter of the sleeve (22) is smaller than the outer diameter of the connecting pipe (11), and the inner diameter of the sleeve (22) is larger than the inner diameter of the connecting pipe (11).

4. The differential pressure sensor as recited in claim 2, wherein: the tube cores of the two sleeves (22) are superposed with the tube cores of the corresponding connecting tubes (11).

5. The differential pressure sensor as recited in claim 1, wherein: the connecting pipe (11) and the metal pipe (20) are arranged at the lower part of the shell (10), and the outer wall of the periphery of the shell (10) is also provided with a plug connector (12), a limiting column and a mounting bracket (14).

6. The differential pressure sensor as recited in claim 1, wherein: the upper part of the shell (10) is open, a cover plate (30) is arranged at the opening, and a sealing ring (40) is arranged between the electronic module component (50) and the inner wall of the shell (10).

7. The differential pressure sensor as recited in claim 1, wherein: the shell (10) and the metal pipe (20) are in an integral structure by injection molding.