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Valve assembly at high-temperature end for exhaust gas recirculation

A valve assembly, high temperature technology, applied in the field of EGR valve, can solve the problems of large interference of connecting rod, easy damage, limited expansion torque of connecting rod, etc., to achieve the effect of improving stability and reliability, stable and reliable sealing, and improving high temperature performance

Pending Publication Date: 2021-07-09
渭南美益特发动机减排技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Although the traditional connecting rod butterfly valve is widely used in the EGR system of medium and heavy diesel engines, the expanding torque of the connecting rod is limited, which requires a high-power motor to drive the connecting rod. Poor performance, especially for the EGR valve used at the high temperature end, because the seal adopts non-metallic elastic components, it is easy to be damaged in a high temperature working environment, which affects the overall life of the valve

Method used

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  • Valve assembly at high-temperature end for exhaust gas recirculation
  • Valve assembly at high-temperature end for exhaust gas recirculation
  • Valve assembly at high-temperature end for exhaust gas recirculation

Examples

Experimental program
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Effect test

Embodiment 1

[0021] This embodiment is a high-temperature end valve assembly for exhaust gas recirculation, such as figure 1 shown. This embodiment includes: a motor 1, a valve cover set 2, and a valve body 3 installed in sequence. The valve body is provided with a valve plate 4 and a valve stem 5 that drives the valve plate to rotate, and the valve stem passes through the valve cover set. The transmission pair 201 in the middle is connected with the motor shaft 102, and the upper and lower ends of the valve plate are provided with an upper metal seal set 6 and a lower metal seal set 7 along the valve stem; a vent is provided between the valve cover set and the valve body In the space 8, a cooling water channel 202 and a guide ring 203 are arranged around the valve stem in the valve cover kit.

[0022] The "upper" and "lower" in this embodiment refer to figure 1 The assembly position state of the valve assembly shown in is also the installation position state of the valve assembly descri...

Embodiment 2

[0033] This embodiment is an improvement of the first embodiment, and is a refinement of the upper metal sealing sleeve of the first embodiment. The upper metal seal set described in this embodiment includes: a lower metal filter screen 601, a shaft sleeve 602, a gasket 603, a metal sealing ring 604, a metal sealing gasket 605, a pressure ring 606 and a package installed on the valve body in sequence along the valve stem. The upper metal filter screen 607 in the pressure ring, such as figure 2 shown.

[0034] The upper sealing structure described in this embodiment is a sealing structure completely made of metal materials. The sealing parts are all made of metal materials and cooperate with metal filter screens, which can meet the working conditions of 650°C high temperature and 5Bar pressure.

[0035] The upper sealing structure is specifically: a metal filter screen at the lower end is arranged on the valve plate along the valve stem to prevent exhaust gas particles and ca...

Embodiment 3

[0042] This embodiment is an improvement of the above embodiment, and is a refinement of the above embodiment regarding the sealing material. The material of the metal sealing ring and the metal sealing gasket in this embodiment is austenitic stainless steel.

[0043] The metal sealing ring and the metal sealing gasket are made of austenitic stainless steel, which can withstand high temperatures below 700°C. The sealing ring and the valve body can adopt a transition fit, and the valve stem can adopt a clearance fit. The gasket is pressed on the gap between the valve body and the sealing ring. After the pressure ring is pressed, the sealing ring and the gasket will not shrink or deform. Rod drives generate no frictional torque. The sealing gasket is made of heat-resistant stainless steel, and is pressed flat against the gap between the valve body and the shaft sleeve to perform radial sealing during assembly.

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Abstract

The invention relates to a valve assembly at a high-temperature end for exhaust gas recirculation. The valve assembly comprises a motor, a valve cover kit and a valve body which are arranged in sequence; a valve plate and a valve rod driving the valve plate to rotate are arranged in the valve body, the valve rod is connected with a motor shaft through a transmission pair in the valve cover kit, and an upper metal sealing kit and a lower metal sealing kit are arranged at the upper end and the lower end of the valve plate along the valve rod; and a ventilation space is arranged between the valve cover kit and the valve body, and a cooling water channel and a flow guide ring are arranged around the valve rod in the valve cover kit. According to the valve assembly at the high-temperature end for exhaust gas recirculation, all-metal sealing is used on the upper side and the lower side of the valve plate, and the high-temperature performance of a sealing piece is improved, so that sealing is stabler and more reliable; meanwhile, deep groove bearings are used for supporting a driving gear and a sector gear, so that supporting friction is reduced, and the rotating torque of the valve rod is reduced; and the problems that a traditional EGR valve is large in power consumption, unstable in transmission, short in service life and the like are solved, so that the stability and reliability of an EGR system of medium and heavy vehicles are improved.

Description

technical field [0001] The invention relates to a high-temperature end valve assembly for exhaust gas recirculation, which is an environmental-friendly auxiliary facility for automobile engines, and is an EGR valve for automobile engines, especially medium and heavy-duty automobile engines. Background technique [0002] The function of the exhaust gas recirculation system is to send part of the exhaust gas produced by the diesel engine back to the cylinder. Since the recirculated exhaust gas is inert and does not participate in chemical reactions, the mixed gas entering the cylinder is diluted and the oxygen concentration is reduced, thereby also making the combustible mixed gas Heat generation is reduced. In addition, due to the CO in the exhaust gas 2 And the heat capacity of water vapor is large, which increases the specific heat capacity of the mixture and reduces the peak temperature in the cylinder. Both of them increase the ignition delay period of the diesel engine...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F02M26/70F02M26/73
CPCF02M26/70F02M26/73
Inventor 景建周杨晓明南鹏伟
Owner 渭南美益特发动机减排技术有限公司
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