CN212615083U

CN212615083U - Structure for reducing valve gas flow leakage in EGR valve

Info

Publication number: CN212615083U
Application number: CN202021780501.3U
Authority: CN
Inventors: 王进丁; 陈余飞; 李宏志; 徐晖
Original assignee: Changhui Auto Electric Huangshan JSC
Current assignee: Changhui Auto Electric Huangshan JSC
Priority date: 2020-08-24
Filing date: 2020-08-24
Publication date: 2021-02-26
Anticipated expiration: 2030-08-24

Abstract

The structure for reducing the leakage of the valve gas flow in the EGR valve comprises a valve seat and a valve rod arranged in the valve seat, wherein an air inlet and an air outlet are formed in the valve seat, a lining is arranged in the valve seat, a diaphragm used for sealing the air inlet and the air outlet is arranged above the lining, the outer diameter of the diaphragm is larger than the inner diameter of the lining, the diaphragm is sleeved in a boss at the tail end of the valve rod, and the boss is riveted with the diaphragm through a rivet structure. The utility model provides a traditional EGR valve structure because of the road conditions difference that the car went, vibrate, factor such as jolt leads to the pressure spring skew, the EGR valve can have the valve rod and lead to valve gas to leak with the bush skew to influence going of car, and traditional structure production qualification rate is low, and the part machining precision is high, problem with high costs.

Description

Structure for reducing valve gas flow leakage in EGR valve

Technical Field

The utility model relates to an automobile engine technical field especially relates to a structure that reduces valve gas flow and leak in EGR valve.

Background

The traditional EGR valve for the automobile drives the valve rod to move by vacuumizing the vacuum chamber, so that the opening degree of the valve is controlled, tail gas is controlled to enter a combustion chamber, the temperature and the pressure of the combustion chamber are reduced, and the generation amount of nitrogen oxide is reduced. When the engine runs at idle speed, low speed and small load and the engine is in cold state operation and when the engine power is required under full load, the EGR valve does not work, so that the valve rod and the bushing need to be sealed, and the leakage is allowed to be less than or equal to 5 SLPM/min. But traditional EGR valve rod is riveted as an organic whole with real empty room motion subassembly, the skew appears easily, and because of the road conditions difference, there is vibration, factor such as jolt to lead to the pressure spring skew moreover in the car driving process, and the EGR valve can have valve rod and bush skew to lead to leaking to influence the driving of car, and traditional structure production qualification rate is low, and the part machining precision is high, and is with high costs. Therefore, the invention needs to provide a structure for reducing the valve gas flow leakage in the EGR valve, which can prevent the EGR valve from leaking under different driving road conditions and can reduce the production cost.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a reduce structure of valve gas flow leakage in EGR valve solves traditional EGR valve structure because of the road conditions difference that the car went, and vibration, factor such as jolt lead to the pressure spring skew, and the EGR valve can have the valve rod and the bush skew leads to leaking to influence going of car, and traditional structure production qualification rate is low, and the part machining precision is high, problem with high costs.

The utility model provides a technical scheme that its technical problem adopted is:

the structure for reducing the leakage of valve gas flow in the EGR valve comprises a valve seat and a valve rod arranged in the valve seat, wherein a gas inlet and a gas outlet are formed in the valve seat, a lining is arranged in the valve seat, a diaphragm used for sealing the gas inlet and the gas outlet is arranged above the lining, the outer diameter of the diaphragm is larger than the inner diameter of the lining, the diaphragm is sleeved in a boss at the tail end of the valve rod and is in clearance fit with the boss, and the boss is riveted with the diaphragm through a rivet structure.

Furthermore, in order to ensure that the diaphragm can still be well sealed with the bushing after the riveting and the skewing of the valve rod, a conical surface structure is arranged on the valve rod opposite to the upper end surface of the diaphragm.

Further, in order to limit the offset of the skew of the valve rod, the angle of the conical surface structure is 160 degrees.

Furthermore, in order to ensure that the valve rod and the diaphragm can still move up and down after the riveting of the valve rod is inclined and deviated, a movable gap is arranged between the riveting structure and the diaphragm.

Furthermore, in order to limit the moving range between the valve rod and the diaphragm, the moving gap is 0.3-0.5 mm.

Further, for corrosion protection, the material of the membrane is stainless steel.

The utility model has the advantages that: the utility model discloses the structure changes traditional EGR valve rod into valve rod and two plane stamping workpiece of diaphragm, bush with the bush, and the position of relative diaphragm up end on the valve rod is provided with conical surface structure, and wherein can move about from top to bottom after diaphragm and the valve rod riveting, cooperates through mobilizable valve rod subassembly and bush plane spare and reaches sealedly to realize reducing valve flow and leak, low in production cost simultaneously, the product percent of pass is high.

The present invention will be described in more detail with reference to the accompanying drawings and examples.

Drawings

Fig. 1 is a structural sectional view of the present invention for reducing the leakage of valve gas flow in an EGR valve.

Fig. 2 is the matching structure schematic diagram of the middle valve rod and the diaphragm of the present invention.

Fig. 3 is the utility model discloses in when the crooked offset back of valve rod, the cooperation sketch map of valve rod and diaphragm.

Detailed Description

The structure for reducing the valve gas flow leakage in the EGR valve as shown in fig. 1 and 2 comprises a valve seat 1 and a valve rod 2 arranged in the valve seat 1, wherein the valve seat 1 is provided with an air inlet 11 and an air outlet 12, a bushing 3 is arranged in the valve seat 1, a diaphragm 4 for sealing the air inlet 11 and the air outlet 12 is arranged above the bushing 3, the outer diameter of the diaphragm 4 is larger than the inner diameter of the bushing 3, the diaphragm 4 is sleeved in a boss at the tail end of the valve rod 2 and is in clearance fit with the boss, a concave hole for rivet turning can be arranged on the boss at the tail end of the valve rod, and the boss is connected with the diaphragm 4 through a rivet turning structure 21 formed after rivet turning.

In order to ensure that the diaphragm 4 can still be perfectly sealed with the bushing 3 after the stem 2 is riveted and skewed, a conical surface structure 22 is arranged on the stem 2 opposite to the upper end surface of the diaphragm 4.

In order to limit the amount of skew offset of the valve stem 2, the angle of the tapered structure 22 is 160 degrees.

In order to ensure that the valve rod 2 and the diaphragm 4 can still move up and down after the riveting deflection of the valve rod 2, a movable gap 23 is arranged between the riveting structure 21 and the diaphragm 4.

In order to limit the moving range between the valve rod and the diaphragm, the moving gap 23 is 0.3-0.5 mm.

For corrosion protection, stainless steel may be used as the material of the membrane 4.

As shown in fig. 3, after the stem 2 is riveted and skewed, the diaphragm 2 can still be perfectly sealed with the bush 3 due to the movable gap 23 between the stem 2 and the diaphragm 4; the position of the valve rod 2 opposite to the upper end face of the diaphragm 4 is provided with a conical surface structure 22, and the valve rod 2 presses the diaphragm 4 in a static state to play a role in sealing. When the valve rod 2 is riveted with the bushing 4 in a different axial center, the diaphragm 4 can still completely cover the air hole of the bushing 3 for sealing due to the large coverage area between the bushing 3 and the diaphragm 4. Therefore, no matter the vibration and bump during the driving process of the automobile, the riveting deflection of the valve rod 2, or the different axial centers of the riveted valve rod 2 and the bush 4, the EGR valve can not generate the condition of large amount of valve flow leakage.

The present invention has been described above with reference to the accompanying drawings, and it is obvious that the present invention is not limited to the above embodiments, and various modifications made by the method concept and technical solution of the present invention or those directly applied to other applications without modification fall within the protection scope of the present invention.

Claims

1. The utility model provides a structure that reduces valve gas flow leakage in EGR valve, includes disk seat (1), sets up valve rod (2) in disk seat (1), be provided with air inlet (11) and gas outlet (12) on disk seat (1), disk seat (1) in be provided with bush (3), its characterized in that, bush (3) top be provided with diaphragm (4) that are used for sealed air inlet (11) and gas outlet (12), the external diameter of diaphragm (4) is greater than the internal diameter of bush (3), diaphragm (4) embolia the boss and the clearance fit of valve rod (2) end, the boss rivet through turning over rivetting structure (21) and diaphragm (4).

2. The structure for reducing the leakage of the valve gas flow in the EGR valve as recited in claim 1, wherein the position of the valve rod (2) relative to the upper end surface of the diaphragm (4) is provided with a conical surface structure (22).

3. The structure for reducing leakage of valve gas flow in an EGR valve according to claim 2, wherein the angle of said tapered surface structure (22) is 160 degrees.

4. The structure for reducing the leakage of the valve gas flow in the EGR valve according to claim 1, wherein a movable gap (23) is provided between the clinch structure (21) and the diaphragm (4).

5. The structure for reducing the leakage of the valve gas flow in the EGR valve as recited in claim 4, wherein the clearance (23) is 0.3 to 0.5 mm.

6. The structure for reducing valve gas flow leakage in an EGR valve according to claim 1, wherein the material of the diaphragm (4) is stainless steel.