CN103291470A - Pneumatic-control valve lift regulating mechanism - Google Patents

Abstract

A pneumatically controlled valve body lift adjustment mechanism in the technical field of mechanical design, including a compressor, an engine, a turbine, a connecting pipe, a valve seat, a valve body, a rotating shaft, a volume cavity, a rotating body and elastic components, and the rotating body is installed on In the volume chamber and in sealing contact with the inner wall of the volume chamber, the lower wall of the rotating body is connected with the lower wall of the volume chamber through elastic components, and the two ends of the first connecting pipe are respectively connected to the exhaust pipe of the turbine and the air inlet of the volume chamber. The two ends of the third connecting pipe communicate with the engine exhaust pipe and the upper wall of the volume chamber respectively. When the engine intake pipe pressure is high, the rotating body drives the valve body to rotate clockwise, the exhaust gas recirculation rate of the engine is high, and the engine explosion pressure is low; when the engine intake pipe pressure is low, the rotating body drives the valve body counterclockwise Rotate, the exhaust gas recirculation rate of the engine is less, and the engine fuel consumption is lower. The invention has reasonable design and simple structure, and is suitable for the exhaust gas recirculation system of the supercharged engine.

Description

Air pressure control valve body lift adjustment mechanism

technical field

The invention relates to an exhaust gas recirculation system in the technical field of mechanical design, in particular to an air pressure control type valve body lift adjustment mechanism.

Background technique

Harmful emissions from engines are a major source of air pollution. With the increasing importance of environmental protection, the goal of reducing harmful emissions from engines has become an important direction for engine development in the world today. With the world's consumption of petroleum products increasing year by year, international oil prices remain high, and the economy of diesel vehicles is becoming more and more prominent, which makes diesel engines occupy an increasingly important position in vehicle power. Therefore, it is the primary task of diesel engine designers to carry out research on the control methods of harmful emissions from diesel engines. Exhaust gas recirculation system is to send a small part of the exhaust gas produced by the diesel engine back to the cylinder. The recirculated exhaust gas will retard the combustion process due to its inertness, that is to say the combustion rate will slow down and cause the pressure build-up process in the combustion chamber to slow down, which is the main reason for the reduction of nitrogen oxides. In addition, increasing the exhaust gas recirculation rate will reduce the total exhaust flow, so the total pollutant output in exhaust emissions will be relatively reduced. Under medium speed conditions, the engine needs a larger exhaust gas recirculation rate to reduce exhaust temperature and reduce pollution; under low speed conditions, the engine needs a smaller exhaust gas recirculation rate to increase the intake air of the engine quantity.

After searching the existing technical literature, it is found that Chinese patent number ZL200410063439.5, patent name: electronic exhaust gas recirculation gas control device, this patent technology provides a device for controlling the exhaust gas recirculation rate of the engine, which can better However, the change of the exhaust gas recirculation rate is realized through a special control structure, which makes the control system more complicated.

Contents of the invention

The present invention aims at the deficiencies of the above-mentioned prior art, and provides an air pressure control type valve body lift adjustment mechanism, so that the exhaust gas recirculation rate can be adjusted by itself, and the medium and low speed conditions of the engine can be well taken into account, and the structure is simple , no special control mechanism is required.

The present invention is achieved through the following technical proposals, the present invention comprises compressor intake pipe, compressor, engine intake pipe, engine, engine exhaust pipe, turbine, turbine exhaust pipe, connecting shaft, first connecting pipe, second The connecting pipe, the third connecting pipe, the valve seat, the valve body, the rotating shaft, the volume cavity, the rotating body and the elastic parts, the air inlet and outlet of the compressor are respectively connected with the air outlet of the air inlet pipe of the compressor and the air inlet of the engine air inlet pipe , the air inlet and outlet of the engine are respectively connected with the air outlet of the engine intake pipe and the air inlet of the engine exhaust pipe, and the air inlet and outlet of the turbine are respectively connected with the air outlet of the engine exhaust pipe and the air inlet of the turbine exhaust pipe, The compressor and the turbine are connected coaxially through the connecting shaft. The upper end of the valve seat has an internal thread hole, the lower end of the valve seat has a volume chamber, and the upper end of the valve body has external threads. The valve body is installed in the valve seat, and the upper end of the valve body is The external thread of the valve body matches the internal thread hole on the upper end of the valve seat. The lower end of the valve body is arranged in the volume chamber. The walls of the volume chamber are solidified together. The longitudinal section of the volume chamber is rectangular. The inner wall surface of the volume cavity is in sealing contact, the cross section of the volume cavity and the rotating body is arc-shaped, the lower wall surface of the rotating body is connected with the lower wall surface of the volume cavity through elastic parts, and there is a groove on the left wall surface of the volume cavity , one end of the rotating shaft passes through the groove on the left wall of the volume cavity and is solidified with the rotating body, the other end of the rotating shaft is solidified with the upper end of the valve body, and the two ends of the first connecting pipe are respectively connected with the turbine exhaust The two ends of the second connecting pipe are respectively connected with the air outlet of the volume chamber and the intake pipe of the compressor, and the two ends of the third connecting pipe are respectively connected with the engine intake pipe and the upper part of the volume chamber. The walls are connected.

Further, in the present invention, the elastic component is a spring, and the first connecting pipe and the third connecting pipe are circular pipes with equal cross-sections.

During the working process of the present invention, the rotating body can freely rotate in the volume cavity, and the rotating body, the rotating shaft and the valve body are solidified together. When the pressure in the intake pipe of the engine is high, the pressure in the volume cavity above the rotating body is also high, the rotating body rotates clockwise and compresses the elastic component, the rotating shaft and the valve body also rotate clockwise synchronously, and the gap between the valve body and the valve seat The throat area of the engine becomes larger, and the exhaust gas recirculation rate of the engine increases, thereby reducing the explosion pressure and the maximum combustion temperature of the engine; Under the elasticity of the elastic parts, the rotating body rotates counterclockwise, the rotating shaft and the valve body also rotate counterclockwise synchronously, the throat area between the valve body and the valve seat becomes smaller, and the exhaust gas recirculation rate of the engine decreases, so that the engine enters The air volume is increased and the fuel consumption is reduced.

Compared with the prior art, the present invention has the following beneficial effects: the present invention is reasonable in design and simple in structure, and is suitable for exhaust gas recirculation systems with turbochargers. The exhaust gas recirculation system does not require a dedicated exhaust gas recirculation rate control mechanism.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is the structural representation of A-A section among Fig. 1;

Fig. 3 is the structural representation of B-B section among Fig. 2;

Among them: 1. Compressor intake pipe, 2. Compressor, 3. Engine intake pipe, 4. Engine, 5. Engine exhaust pipe, 6. Turbine, 7. Turbine exhaust pipe, 8. Connecting shaft, 9. A connecting pipe, 10, a second connecting pipe, 11, a third connecting pipe, 12, a valve seat, 13, a valve body, 14, a volume chamber, 15, a rotating shaft, 16, a volume chamber, 17, a rotating body, 18, Elastic parts.

Detailed ways

The embodiments of the present invention will be described in detail below in conjunction with the accompanying drawings. This embodiment is based on the technical solution of the present invention, and provides detailed implementation methods and specific operating procedures, but the scope of protection of the present invention is not limited to the following embodiments. .

Example

As shown in Fig. 1 to Fig. 3, the present invention comprises compressor intake pipe 1, compressor 2, engine intake pipe 3, engine 4, engine exhaust pipe 5, turbine 6, turbine exhaust pipe 7, connecting shaft 8, the first A connecting pipe 9, a second connecting pipe 10, a third connecting pipe 11, a valve seat 12, a valve body 13, a rotating shaft 15, a volume cavity 16, a rotating body 17 and an elastic member 18, and the air inlet and outlet of the compressor 2 are respectively connected with the compressed air. The air outlet of engine intake pipe 1 and the air inlet of engine air intake pipe 3 are connected, the air inlet and outlet of engine 4 are connected with the air outlet of engine air inlet pipe 3 and the air inlet of engine exhaust pipe 5 respectively, and the inlet and outlet of turbine 6 The air ports are respectively connected with the air outlet of the engine exhaust pipe 5 and the air inlet of the turbine exhaust pipe 7, the compressor 2 and the turbine 6 are connected coaxially through the connecting shaft 8, the upper end of the valve seat 12 has an internal thread hole, and the valve The lower end of the seat 12 has a volume chamber 14, the upper end of the valve body 13 has an external thread, the valve body 13 is installed in the valve seat 12, the external thread on the upper end of the valve body 13 matches the internal thread hole on the upper end of the valve seat 12, the valve The lower end of the body 13 is arranged in the volume chamber 14, the walls of the volume chamber 16 are consolidated together, the longitudinal section of the volume chamber 16 is rectangular, the rotating body 17 is installed in the volume chamber 16 and is in sealing contact with the inner wall surface of the volume chamber 16 The volume cavity 16 and the cross-section of the rotating body 17 are arc-shaped, the lower wall of the rotating body 17 is connected with the lower wall of the volume cavity 16 through the elastic member 18, and there is a groove on the left wall of the volume cavity 16, One end of the rotating shaft 15 passes through the groove on the left wall of the volume cavity 16 and is fixed together with the rotating body 17, and the other end of the rotating shaft 15 is fixed together with the upper end of the valve body 13, and the two ends of the first connecting pipe 9 The two ends of the second connecting pipe 10 are respectively connected with the air outlet of the volume chamber 14 and the air intake pipe 1 of the compressor, and the two ends of the third connecting pipe 11 are respectively connected to each other. The ends communicate with the upper wall surface of the engine intake pipe 5 and the volume chamber 16 respectively, the elastic member 18 is a spring, and the first connecting pipe 9 and the third connecting pipe 11 are circular pipes with equal cross-sections.

During the working process of the present invention, the rotating body 17 can freely rotate in the volume cavity 16, and the rotating body 17, the rotating shaft 15 and the valve body 13 are solidified together. When the pressure in the engine intake pipe 3 is high, the pressure in the volume chamber 16 above the rotating body 17 is also high, the rotating body 17 rotates clockwise and compresses the elastic member 18, the rotating shaft 15 and the valve body 13 also rotate clockwise synchronously, The throat area between the valve body 13 and the valve seat 12 becomes larger, and the exhaust gas recirculation rate of the engine increases, thereby reducing the explosion pressure and the maximum combustion temperature of the engine; when the pressure in the engine intake pipe 3 is small, the rotating body 17 The pressure in the upper volume chamber 16 is also small, and the rotating body 17 rotates counterclockwise under the elastic action of the elastic member 18, and the rotating shaft 15 and the valve body 13 also rotate counterclockwise synchronously, and the throat between the valve body 13 and the valve seat 12 The smaller the port area, the lower the exhaust gas recirculation rate of the engine, so that the intake air volume of the engine is increased and the fuel consumption is reduced.

Claims (2)

1. Pneumatic control type valve body lift controlling mechanism, comprise compressor air inlet machine pipe (1), gas compressor (2), engine air inlet tube (3), motor (4), engine exhaust pipe (5), turbine (6), turbine exhaust pipe (7) and coupling shaft (8), the air inlet/outlet of gas compressor (2) respectively with the air outlet of compressor air inlet machine pipe (1), the suction port of engine air inlet tube (3) is connected, the air inlet/outlet of motor (4) respectively with the air outlet of engine air inlet tube (3), the suction port of engine exhaust pipe (5) is connected, the air inlet/outlet of turbine (6) respectively with the air outlet of engine exhaust pipe (5), the suction port of turbine exhaust pipe (7) is connected, gas compressor (2) and turbine (6) are by coaxial linking to each other of coupling shaft (8), it is characterized in that, also comprise first connecting tube (9), second connecting tube (10), the 3rd connecting tube (11), valve seat (12), valve body (13), running shaft (15), cavity volume (16), solid of rotation (17) and elastic member (18), the upper end of valve seat (12) has interior threaded hole, the lower end of valve seat (12) has chamber volume (14), the upper end of valve body (13) has outside thread, valve body (13) is installed in the valve seat (12), the interior threaded hole of the outside thread of valve body (13) upper end and valve seat (12) upper end is complementary, the lower end of valve body (13) is arranged in the chamber volume (14), the wall of cavity volume (16) all is consolidated, the longitudinal section of cavity volume (16) is rectangular, solid of rotation (17) is installed in the cavity volume (16) and with the internal face sealing of cavity volume (16) and contacts, cavity volume (16), the cross section of solid of rotation (17) is for all circular-arc, the lower wall surface of solid of rotation (17) is connected by the lower wall surface of elastic member (18) with cavity volume (16), left wall at cavity volume (16) has a groove, one end of running shaft (15) is consolidated with solid of rotation (17) after passing groove on the left wall of cavity volume (16), the other end of running shaft (15) and valve body (13) upper end are consolidated, the two ends of first connecting tube (9) respectively with turbine exhaust pipe (7), the suction port of chamber volume (14) is connected, the two ends of second connecting tube (10) respectively with the air outlet of chamber volume (14), compressor air inlet machine pipe (1) is connected, the two ends of the 3rd connecting tube (11) respectively with engine air inlet tube (3), the upper wall surface of cavity volume (16) is connected.

2. Pneumatic control type valve body lift controlling mechanism according to claim 1 is characterized in that elastic member (18) is spring, and first connecting tube (9), the 3rd connecting tube (11) are the uniform section pipe.

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