阅读说明：本技术 一种egr阀板双球面密封结构 (EGR valve plate double-spherical surface sealing structure ) 是由 岳鹏 吴东锋 齐福海 温开源 于 2021-09-30 设计创作，主要内容包括：本发明公开了一种EGR阀板双球面密封结构,包括阀杆、阀座、阀体和阀体,阀体内设有阀杆套；阀杆杆体可滑动安装在阀杆套内,杆端与阀板固定连接；阀板侧面为弧形,中心设有一沉孔和杆端球面配合；阀板嵌入孔的下端边缘与阀板侧面球面配合,形成双球面密封结构。本发明通过将阀杆与阀板中心台阶设计为球面接触且径向间隙配合,同时阀板与阀座接触面也设计成球面密封,当阀杆与阀板及阀座有形位公差时,阀杆与阀板可微调使阀板与阀座可以自动找正密封面,这种双球面密封结构大大的降低了对零件加工的形位公差要求,使得加工简单密封更加可靠,同时阀杆与阀板不用焊接,避免了焊接内应力及变形,减少激光焊接工艺,节省了成本。(The invention discloses a double-spherical-surface sealing structure of an EGR (exhaust gas recirculation) valve plate, which comprises a valve rod, a valve seat, a valve body and a valve body, wherein a valve rod sleeve is arranged in the valve body; the valve rod body can be slidably arranged in the valve rod sleeve, and the rod end is fixedly connected with the valve plate; the side surface of the valve plate is arc-shaped, and the center of the valve plate is provided with a counter bore matched with the spherical surface of the rod end; the lower end edge of the valve plate embedding hole is matched with the spherical surface of the side surface of the valve plate to form a double-spherical-surface sealing structure. The valve rod and the valve plate center step are designed to be in spherical contact and in radial clearance fit, meanwhile, the contact surface of the valve plate and the valve seat is also designed to be in spherical surface sealing, when the valve rod, the valve plate and the valve seat have form and position tolerance, the valve rod and the valve plate can be finely adjusted to enable the valve plate and the valve seat to automatically align the sealing surface, the double-spherical-surface sealing structure greatly reduces the form and position tolerance requirement for part processing, enables the processing to be simple and more reliable, simultaneously, the valve rod and the valve plate do not need to be welded, avoids welding internal stress and deformation, reduces a laser welding process, and saves cost.)

1. The utility model provides a two spherical seal structures of EGR valve plate which characterized in that: comprises a valve body, the upper part of which is provided with a valve rod mounting hole and is internally provided with a valve rod sleeve; the valve seat is fixedly arranged in the valve body, and the middle part of the valve seat is provided with a valve plate embedding hole; the valve rod comprises a rod body and a rod end, the rod body is slidably arranged in the valve rod sleeve, and the rod end is fixedly connected with a valve plate; the valve plate is frustum-shaped, the side surface of the valve plate is arc-shaped, and the upper end of the valve plate can be sleeved into the valve plate embedding hole; the center of the valve plate is provided with a counter bore which is matched with the rod end, the upper contact surface and the lower contact surface of the counter bore and the rod end are in spherical fit, and the spherical radius is R1; the lower end edge of the valve plate inserting hole is matched with the side face of the valve plate in a spherical mode, the spherical radius is R2, and the R1 and the R2 are concentric and fall on the central line of the valve rod to form a double-spherical-surface sealing structure.

2. The dual spherical sealing structure of an EGR valve plate according to claim 1, wherein: and a valve rod sealing ring is arranged above the valve rod sleeve, and a plurality of pressure points are arranged on the upper end surface of the valve rod sealing ring for fixing the valve rod sealing ring.

3. The dual spherical sealing structure of an EGR valve plate according to claim 1, wherein: the lower end of the valve rod mounting hole is provided with a sleeve cover.

4. The dual spherical sealing structure of an EGR valve plate according to claim 1, wherein: the valve body is installed the lower end face circumference direction of disk seat is equipped with inwards presses and rivets the limit, the disk seat adopts the mode of impressing to install on the valve body inner wall.

5. The dual spherical sealing structure of an EGR valve plate according to claim 1, wherein: and a wave spring gasket and a shaft retainer ring are arranged above the valve plate, and the valve rod is fixedly arranged on the valve plate.

6. The dual spherical sealing structure of an EGR valve plate according to claim 1, wherein: the joint of the rod end of the valve rod and the rod body is in spherical transition.

7. The dual spherical sealing structure of an EGR valve plate according to claim 1, wherein: the lower end of the valve plate is provided with an annular groove.

Technical Field

The invention relates to an Exhaust Gas Recirculation (EGR) valve component of an automobile diesel engine, in particular to a torque valve driven by an (EGR) electromagnetic valve coil.

Background

The EGR valve is an electromechanical integrated product mounted on a diesel engine for controlling the amount of exhaust gas recirculation fed back to the intake system. It is usually located on the right side of the intake manifold, near the throttle body, and a short metal tube leading to the exhaust manifold is connected to it. The function of the exhaust gas recirculation system is to control the amount of exhaust gas entering the intake manifold so that a certain amount of exhaust gas flows into the intake manifold for recirculation. EGR valves are a very important, critical component in exhaust gas recirculation devices.

A typical diesel engine Exhaust Gas Recirculation (EGR) valve assembly is directed primarily to engines with exhaust emission requirements. The engine aims to improve the working efficiency of the engine, improve the combustion environment, reduce the load of the engine, effectively reduce the emission of NO compounds, reduce knocking and prolong the service life of each part.

The traditional EGR valve sealing structure generally adopts a laser welding process for a valve rod and a valve plate after the valve is assembled, and the process has two problems, wherein the welding of the process causes internal stress of parts and has the risk of fracture in the use process. The second welding deforms the parts. Because the valve plate and valve seat are hard seals and typically wire seals, when the parts are deformed, it is difficult to completely seal between the valve plate and valve seat, resulting in leakage.

Disclosure of Invention

The invention aims to provide a double-spherical sealing structure of an EGR valve plate to solve the problems.

The technical problem solved by the invention can be realized by adopting the following technical scheme: a double-spherical-surface sealing structure of an EGR valve plate comprises a valve body, wherein a valve rod mounting hole is formed in the upper part of the valve body, and a valve rod sleeve is arranged in the valve rod mounting hole; the valve seat is fixedly arranged in the valve body, and the middle part of the valve seat is provided with a valve plate embedding hole; the valve rod comprises a rod body and a rod end, the rod body is slidably arranged in the valve rod sleeve, and the rod end is fixedly connected with a valve plate; the valve plate is frustum-shaped, the side surface of the valve plate is arc-shaped, and the upper end of the valve plate can be sleeved into the valve plate embedding hole; the center of the valve plate is provided with a counter bore which is matched with the rod end, the upper contact surface and the lower contact surface of the counter bore and the rod end are in spherical fit, and the spherical radius is R1; the lower end edge of the valve plate inserting hole is matched with the side face of the valve plate in a spherical mode, the spherical radius is R2, and the R1 and the R2 are concentric and fall on the central line of the valve rod to form a double-spherical-surface sealing structure.

Preferably, a valve rod sealing ring is arranged above the valve rod sleeve, and a plurality of pressure points are arranged on the upper end face of the valve rod sealing ring for fixing the valve rod sealing ring.

Preferably, the lower end of the valve rod mounting hole is provided with a collecting cover.

Preferably, the valve body is installed the lower terminal surface circumferencial direction of disk seat is equipped with inwards presses and rivets the limit, the disk seat adopts the mode of impressing to install on the valve body inner wall.

Preferably, a wave spring gasket and a shaft retainer ring are arranged above the valve plate, and the valve rod is fixedly mounted on the valve plate.

Preferably, the joint of the rod end of the valve rod and the rod body is in spherical transition.

Preferably, the lower end of the valve plate is provided with an annular groove.

The valve rod and the valve plate center step are designed to be in spherical contact and in radial clearance fit, meanwhile, the contact surface of the valve plate and the valve seat is also designed to be in spherical surface sealing, when the valve rod, the valve plate and the valve seat have form and position tolerance, the valve rod and the valve plate can be finely adjusted to enable the valve plate and the valve seat to automatically align the sealing surface, the double-spherical-surface sealing structure greatly reduces the form and position tolerance requirement for part processing, enables the processing to be simple and more reliable, simultaneously, the valve rod and the valve plate do not need to be welded, avoids welding internal stress and deformation, reduces a laser welding process, and saves cost.

Drawings

FIG. 1 is an overall cross-sectional schematic view of the present invention.

Fig. 2 is a schematic view of a valve stem configuration.

Fig. 3 is a schematic view of a valve seat structure.

Fig. 4 is a schematic view of the valve plate structure.

In the figure, a valve rod 1, a valve rod sealing ring 2, a valve rod sleeve 3, a valve body 4, a carbon deposition cover 5, a check ring for 6 shafts, a wave-shaped elastic gasket 7, a valve seat 8, a valve plate 9, a rod body 11, a rod end 12, a check ring groove 13, a valve rod mounting hole 41, an upper valve cavity 42, a lower valve cavity 43, a valve plate embedding hole 81, a spherical groove 82, a counter bore 91 and an annular groove 92.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific examples, but the embodiments of the invention are not limited thereto.

Fig. 1 to 4 show a preferred embodiment of the present invention, which comprises a valve rod 1, a valve seat 8, a valve body 4 and a valve body 9.

Valve rod mounting hole 41 has been seted up on the upper portion of valve body 4, is equipped with valve rod cover 3 in the valve rod mounting hole 41, and valve rod 1 includes the body of rod 11 and rod end 12, and the slidable suit of the body of rod is in valve rod cover 3, and the top of valve rod cover 3 is equipped with valve rod sealing ring 2, and the up end of valve body 4 installation sealing ring is equipped with a plurality of pressure points (not shown in the figure) to fixed valve rod sealing ring 2 (rivet from 4 terminal surface circumferencial directions of valve body promptly, carry on spacingly to sealing ring 2). The lower end of the valve rod mounting hole 41 is provided with a lap cover 5.

The valve seat 8 is arranged in the valve body 4, the inner cavity of the valve body 4 is divided into an upper valve cavity 42 and a lower valve cavity 43, an inward pressing riveting edge (not shown in the figure) is arranged in the circumferential direction of the lower end face of the valve body 4 for mounting the valve seat 8, and the inward pressing riveting edge is mounted on the inner wall of the valve body 4 in a pressing-in mode. A valve plate insertion hole 81 is formed in the middle of the valve seat 8.

The valve plate 9 is frustum-shaped, the side surface is arc-shaped, and the upper end of the valve plate can be sleeved into the valve plate embedding hole 81. The valve plate 9 is provided with a counter bore 91 in the center, the rod end 12 of the valve rod 1 is embedded into the counter bore 91, the rod body 11 passes through the lower part of the valve plate 9 and then passes through the valve rod mounting hole 41, and then the wave spring gasket 7 and the shaft retainer ring 6 are sleeved on the upper part of the valve plate 9 to fixedly mount the valve rod 1 on the valve plate 9. The lower part of the rod body 11 is provided with a retainer groove 13, and a retainer 6 for a shaft is arranged in the retainer groove 13.

The upper and lower contact surfaces of the counterbore 91 and rod end 12 are designed to mate with one another in a spherical surface having a radius R1. When the valve stem 1 is loaded by an upward force, a spherical sealing structure is formed. Meanwhile, the lower end edge of the valve plate insertion hole 81 is provided with a spherical groove 82 which is matched with the side surface of the valve plate 9, the spherical radius is R2, and when the valve rod 1 is loaded by upward force, a spherical sealing structure is formed. R1 and R2 are concentric, and the centers of the circles fall on the central line of the valve rod 1 to form a double-spherical sealing structure.

The joint of the rod end 12 of the valve rod 1 and the rod body 11 is in spherical transition.

An annular groove 92 is opened to the lower extreme of valve plate 9, and when valve rod 1 received the effect of carrying of upward power, because of the existence of annular groove 92, valve plate 9 can produce micro-deformation for valve plate 9 is inseparabler with the cooperation of disk seat 8, and sealed effect is better.

The above description is only a preferred embodiment of the present invention, and is not intended to limit the technical scope of the present invention, so that any minor modifications, equivalent changes and modifications made to the above embodiments according to the technical spirit of the present invention still belong to the protection scope of the present invention.