CN211116213U

CN211116213U - Urea pressure sensor with tapered liquid inlet hole

Info

Publication number: CN211116213U
Application number: CN201922360444.7U
Authority: CN
Inventors: 奚晟航; 朱荣惠
Original assignee: WUXI YOYONG SENSING Inc
Current assignee: WUXI YOYONG SENSING Inc
Priority date: 2019-12-25
Filing date: 2019-12-25
Publication date: 2020-07-28
Anticipated expiration: 2029-12-25

Abstract

The utility model discloses a urea pressure sensor with a taper liquid inlet hole, which relates to the technical field of sensor processing and comprises a stainless steel shell with a port and a connector which can be screwed with the stainless steel shell; follow the stainless steel casing inner chamber corresponds the port department is provided with the sealing washer, placed ceramic core module on the sealing washer, placed the gasket on the ceramic core module, the ceramic core module pass through the flexographic plate with the connector welding, and through set up in jump ring on the gasket with the inner wall joint of stainless steel casing. The device not only reduces the product cost and the production process, but also greatly improves the service performance and the service life of the product.

Description

Urea pressure sensor with tapered liquid inlet hole

Technical Field

The utility model belongs to the technical field of the sensor processing technique and specifically relates to a take urea pressure sensor in tapering feed liquor hole.

Background

The urea pressure sensor is a sensor of the SCR urea injection system for diesel engine exhaust aftertreatment. As the requirement of environmental protection is increasingly improved, higher requirements are put on the exhaust emission of diesel engines. Particulate Matter (PM) and nitrogen oxides (NOx) produced by diesel engines are the two most prominent pollutants in emissions. From the current technical approach of reducing the automobile exhaust emission, to reach the Euro IV emission standard, measures are generally not taken from the structural aspect of an engine, and an exhaust aftertreatment mode is usually adopted to reduce the emission of pollutants, while a urea-SCR selective catalytic reduction method is the most realistic method and can reduce NOx in the engine exhaust by more than 50%. A typical urea-SCR system needs to be additionally provided with a set of more complex injection and control system for adjusting the injection quantity of the reducing agent on the basis of the original tail gas purification system. The urea pressure sensor is a sensor of an SCR urea injection system for diesel engine exhaust aftertreatment, and performs urea pressure detection to provide assistance for determining the amount of urea injection.

Because urea pressure sensor need work in the urea environment for a long time, after the car is put out of fire, SCR system stop work, in urea pressure sensor's feed liquor hole, there is urea liquid to remain, remaining urea liquid can form the urea crystallization when the low temperature, because ceramic core direct mount is in the stainless steel shell, the diaphragm of ceramic core can be extruded to the urea crystallization for among the urea pressure sensor most critical ceramic core life greatly reduced, the diaphragm is squeezed the fracture and leads to the direct inefficacy of sensor even. The liquid inlet hole of the existing urea pressure port is a cylindrical hole, an anti-freezing plug made of silicon rubber is arranged in the cylindrical hole, so that the phenomenon that urea crystals extrude the anti-freezing plug instead of directly extruding a ceramic core diaphragm is avoided, but the liquid inlet hole structure of each type of urea pressure sensor is different, so that each new urea pressure sensor is developed, a set of anti-freezing plug die needs to be correspondingly opened, the product cost is increased, the production procedures are increased, and the anti-freezing plug can fall off in the long-term use process, so that the sensor fails due to the reasons.

Therefore, there is an urgent need for an improvement to solve the above problems.

SUMMERY OF THE UTILITY MODEL

The utility model is not enough to prior art, the utility model provides a take urea pressure sensor in tapering feed liquor hole, change the cylinder feed liquor hole of original stainless steel port into taking tapered feed liquor hole, after SCR system stop work, tapered feed liquor pore structure more is favorable to remaining urea liquid to flow out from the hole, even low temperature urea forms the crystallization at downthehole, because crystallization atress direction down, opposite with ceramic core diaphragm direction, can directly not go to the extrusion diaphragm, make under the prerequisite of plug that prevents frostbite not additionally installed, also can avoid ceramic core by the crowded problem of splitting of urea crystallization effectively, product cost and production processes have been reduced promptly, the performance and the life of product have been improved greatly again.

In order to realize the purpose of the utility model, the utility model provides a following technical scheme:

a urea pressure sensor with a taper liquid inlet hole comprises a stainless steel shell 1 with a port 8 and a connector 4 which can be screwed with the stainless steel shell 1; the port 8 is provided with an included angle; follow 1 inner chamber of stainless steel casing corresponds 8 departments of port are provided with sealing washer 2, placed ceramic core module 7 on the sealing washer 2, placed gasket 3 on the ceramic core module 7, ceramic core module 7 through flexographic plate 5 with 4 welding of connector, and through set up in jump ring 6 on the gasket 3 with the inner wall joint of stainless steel casing 1.

Preferably, the port 8 is in the shape of a cone.

Preferably, the diameter of the upper bottom of the port 8 is 0.5 mm-1 mm, and the included angle of the port is 10-15 degrees.

Advantageous effects

The utility model provides a take urea pressure sensor in tapering feed liquor hole, change the cylinder feed liquor hole of original stainless steel port into taking tapering feed liquor hole, after SCR system stop work, tapering feed liquor pore structure more is favorable to remaining urea liquid to flow out from the hole, even low temperature urea forms the crystallization at downthehole, because crystallization atress direction is down, with ceramic core diaphragm opposite direction, can directly not go to extrude the diaphragm, make under the prerequisite of not additionally installing the anti-freezing stopper, also can avoid ceramic core by the crowded problem of splitting of urea crystallization effectively, product cost and production processes have been reduced promptly, the performance and the life of product have been improved greatly again.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.

Fig. 1 is the utility model discloses a take urea pressure sensor's in tapering feed liquor hole structural schematic.

Graphic notation:

1-stainless steel shell, 2-sealing ring, 3-gasket, 4-connector, 5-flexible plate, 6-snap spring, 7-ceramic core module and 8-port.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

As shown in figure 1, a urea pressure sensor with a taper liquid inlet hole comprises a stainless steel shell 1 with a port 8 and a connector 4 which can be screwed with the stainless steel shell 1; the port 8 is provided with an included angle; follow 1 inner chamber of stainless steel casing corresponds 8 departments of port are provided with sealing washer 2, placed ceramic core module 7 on the sealing washer 2, placed gasket 3 on the ceramic core module 7, ceramic core module 7 through flexographic plate 5 with 4 welding of connector, and through set up in jump ring 6 on the gasket 3 with the inner wall joint of stainless steel casing 1.

In this embodiment, the port 8 has a conical shape. The port 8 is a liquid inlet hole, after the SCR system stops working, the liquid inlet hole structure of the conical cylindrical port is more beneficial to residual urea liquid to flow out of the hole, and even if low-temperature urea forms crystals in the hole, the crystals cannot be directly extruded due to the fact that the stress direction of the crystals is downward and is opposite to the direction of the ceramic core diaphragm, and therefore the problem that the ceramic core is cracked due to the urea crystals can be effectively solved on the premise that the anti-freezing plug is not additionally installed.

As a further optimization of the embodiment, the diameter of the upper bottom of the port 8 is 0.5 mm-1 mm, and the size can reduce the residue of urea crystals on the bottom surface of the upper end module; the included angle of the port 8 is 10-15 degrees, the setting is more beneficial to residual urea liquid to flow out of the hole, and the included angle range can facilitate machining.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, a plurality of modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.

Claims

1. The utility model provides a take urea pressure sensor in tapering feed liquor hole which characterized in that: comprises a stainless steel shell (1) with a port (8) and a connector (4) which can be screwed with the stainless steel shell (1); the port (8) is provided with an included angle; follow stainless steel casing (1) inner chamber corresponds port (8) department is provided with sealing washer (2), placed ceramic core module (7) on sealing washer (2), placed gasket (3) on ceramic core module (7), ceramic core module (7) through flexographic plate (5) with connector (4) welding, and through set up in jump ring (6) on gasket (3) with the inner wall joint of stainless steel casing (1).

2. The urea pressure sensor with the taper liquid inlet hole as claimed in claim 1, wherein: the port (8) is in the shape of a conical cylinder.

3. The urea pressure sensor with the taper liquid inlet hole as claimed in claim 2, wherein: the diameter of the upper bottom of the port (8) is 0.5 mm-1 mm, and the included angle is 10-15 degrees.