阅读说明：本技术 一种减少egr阀中阀气流量泄漏的结构 (Structure for reducing valve gas flow leakage in EGR valve ) 是由 王进丁 陈余飞 *** 徐晖 于 2020-08-24 设计创作，主要内容包括：一种减少EGR阀中阀气流量泄漏的结构,包括阀座,设置在阀座内的阀杆,所述阀座上设置有进气口和出气口,所述的阀座内设置有衬套,所述的衬套上方设置有用于密封进气口和出气口的膜片,所述膜片的外径大于衬套的内径,所述的膜片套入阀杆末端的凸台,所述的凸台通过翻铆结构与膜片铆接。本发明解决了传统的EGR阀结构因汽车行驶的路况不同,振动、颠簸等因素导致压簧偏移,EGR阀会存在阀杆与衬套偏移导致阀气泄漏,从而影响汽车的行驶,且传统结构生产合格率低,零件加工精度高,成本高的问题。(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 EGR valve solves the problems that the traditional EGR valve structure has low production yield, high part processing precision and high cost because the pressure spring deviates due to factors such as vibration, jolt and the like and the valve rod and the bush deviate to cause valve gas leakage to influence the driving of the automobile due to the deviation of the pressure spring and the valve rod and the bush.)

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.

Technical Field

The invention relates to the technical field of automobile engines, in particular to a structure for reducing valve gas flow leakage in an 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.

Disclosure of Invention

The invention aims to provide a structure for reducing valve gas flow leakage in an EGR valve, and solves the problems that the traditional EGR valve structure has the defects that a pressure spring deviates due to factors such as vibration and bumping and the like caused by different road conditions of automobile running, the EGR valve has the defects that a valve rod deviates from a bush to cause leakage, so that the running of the automobile is influenced, and the traditional structure has low production yield, high part processing precision and high cost.

The technical scheme adopted by the invention for solving the technical problems is as follows:

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 invention has the beneficial effects that: the structure of the invention changes the traditional EGR valve rod and bush into two plane stamping parts of the valve rod, the diaphragm and the bush, the position of the valve rod relative to the upper end surface of the diaphragm is provided with a conical surface structure, wherein the diaphragm and the valve rod can move up and down after being riveted, and the sealing is achieved by matching the movable valve rod component and the bush plane part, thereby realizing the reduction of the valve flow leakage, and simultaneously having low production cost and high product qualification rate.

The invention will be explained in more detail below with reference to the drawings and examples.

Drawings

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

Fig. 2 is a schematic view of the matching structure of the valve stem and the diaphragm in the present invention.

FIG. 3 is a schematic diagram of the valve stem and diaphragm of the present invention after the valve stem has been deflected.

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 invention has been described above with reference to the accompanying drawings, and it is to be understood that the invention is not limited in its application to the details of construction and to the arrangements of the components set forth in the following description, since various modifications may be made without departing from the spirit or scope of the invention.