CN107091362B

CN107091362B - Coaxial double-electromagnetic fuel gas injection valve with adjustable cross-sectional flow area

Info

Publication number: CN107091362B
Application number: CN201710512056.9A
Authority: CN
Inventors: 宋恩哲; 王毓源; 范立云; 董全; 杨立平
Original assignee: Harbin Engineering University
Current assignee: Harbin Engineering University
Priority date: 2017-06-28
Filing date: 2017-06-28
Publication date: 2023-06-09
Anticipated expiration: 2037-06-28
Also published as: CN107091362A

Abstract

The invention aims to provide a coaxial double-electromagnetic gas injection valve with adjustable flow cross-section area, which realizes adjustable gas flow through a double-valve-core double-electromagnet control structure. The air inlet and the flow guiding process are realized through the straight-through structure and the flow guiding cavity structure; the control of the valve core and the control of the air path are realized through the control of the actuator, so that the air injection function is realized; the outer guide structure is matched with the inner guide cavity and the pressure balance groove, so that the perpendicularity of the valve core is ensured, the stable operation and the reliable operation of air flow are realized, and the high response speed is realized; the high flow is realized by the mixed air inlet mode of direct air inlet of the axial main air groove and air inlet of the circumferential air-filling holes, the air supply efficiency of the engine is effectively improved, meanwhile, the air flow interference can be avoided, and the stability of an air path is realized; the surface sealing and high reliability of the gas injection valve are realized through the multi-channel annular band structure between the valve core and the valve seat.

Description

Coaxial double-electromagnetic fuel gas injection valve with adjustable cross-sectional flow area

Technical Field

The invention relates to a gas injection valve, in particular to a gas injection valve of a gas system of a natural gas engine.

Background

Environmental pollution is increasingly serious, emission index requirements are becoming strict, and demands on high-power gas engines in the market are increasing. With the use of large-scale gas engines, the manufacture, maintenance and repair of critical components become important factors restricting the development of the gas engine, and a gas injection valve is one such critical component. The gas injection valve is one of core parts of the gas engine with gas fuel electric control multi-point injection and comprises a dual-fuel engine, can realize the timing and quantitative stage gas supply and gas inlet layering of each cylinder, and has very important influence on the dynamic property and the emission property of the gas engine or the dual-fuel engine. The injection valve needs to work for thousands of hours under severe working conditions such as high temperature and high pressure, and maintenance work such as disassembly can cause gradual accumulation of errors, and finally the injection valve is difficult to debug.

Therefore, a high-flow gas injection valve with high response speed, high control precision, good reliability and adjustable jet flow is required to be developed, so that the circulation capacity of the high-flow gas injection valve can meet the normal working requirement of a natural gas engine in a high-load state.

Disclosure of Invention

The coaxial double-electromagnetic fuel gas injection valve with the adjustable flow cross section has the advantages of high response speed, stable fuel gas injection, high reliability and reverse leakage prevention.

The purpose of the invention is realized in the following way:

the invention discloses a coaxial double-electromagnetic fuel gas injection valve with adjustable cross-sectional area, which is characterized in that: comprises a valve body, a main electromagnet, a secondary electromagnet, a valve core assembly, a valve rod, a T-shaped armature, a small valve core and a valve seat, wherein the valve seat is fixed below the valve body, the main electromagnet comprises an iron core and a main reset spring, a coil is wound in the iron core and is provided with an annular groove, the secondary electromagnet comprises a secondary iron core and a secondary reset spring, the secondary iron core is wound with a secondary coil and is provided with an annular groove, the secondary iron core is fixed with the upper end of the valve body, the iron core is positioned below the secondary iron core, the T-shaped armature is arranged between the iron core and the secondary iron core, the upper surface of the T-shaped armature is provided with the annular groove, the annular groove of the T-shaped armature and the annular groove of the secondary iron core are provided with a secondary reset spring, the valve core assembly comprises an armature, a spring seat, a bottom plate, a valve core, an armature, a bottom plate and valve cores are arranged from top to bottom and are connected together through fastening bolts, the spring seat is positioned outside the armature and forms an annular groove with the armature, two ends of the main return spring are respectively arranged in the annular groove of the iron core and the annular groove of the spring seat, the bottom plate is provided with a pressure balance groove, the valve core is provided with a sealing annular belt and ribs, the sealing annular belt forms an annular cavity, the valve seat is provided with an air outlet annular belt and a guide block, the guide block is positioned around the valve core, the air outlet annular belt is positioned below the annular cavity, the air outlet is arranged below the annular cavity, the upper surface of the valve core is provided with an axial main air groove, the ribs are provided with circumferential air supplementing holes, the air supplementing holes are provided with flow guiding cone angles, the upper end of the valve rod is fixed with the T-shaped armature, the lower end of the valve rod sequentially penetrates through the iron core, the armature, the bottom plate and the valve core and is fixed with the small valve core, the small valve core is positioned on the valve seat, and the valve seat below the small valve core is provided with an air outlet.

The invention may further include:

1. the small valve core and the valve rod are both made of nonmetallic materials.

2. When the small flow is needed, the secondary coil is electrified, the T-shaped armature overcomes the pretightening force of the secondary reset spring under the action of electromagnetic force and then drives the valve rod to move upwards, the valve rod drives the small valve core to move upwards, and the air outlet hole sprays air; when a large flow is needed, the coil is electrified, the armature moves upwards after overcoming the pretightening force of the main reset spring under the action of electromagnetic force, and the armature drives the whole valve core assembly to move upwards, and the air outlet is sprayed with air; when the air injection needs to be closed, the coil and the secondary coil are powered off, the armature and the T-shaped armature move downwards under the action of the main reset spring and the secondary reset spring respectively until the armature and the T-shaped armature return to the initial positions again, and the air injection is finished.

The invention has the advantages that: the invention realizes the adjustable air flow rate through the structure of double-valve core and double electromagnet control. The inner diversion cavity is formed in the center of the armature, a certain number of pressure balance grooves are formed in the bottom plate, so that the armature is prevented from being subjected to axial force, the pressure of an inner air path and an outer air path at the armature is more easily balanced, and the response speed of the armature is improved; according to the invention, the four ribs of the valve core are provided with the circumferential air supplementing holes, so that the flow area is increased, the valve core quality is reduced, and the reliability is improved. The circumferential air supplementing holes of the valve core are provided with the air outlet ring belt with a certain angle, so that the flow loss is reduced, and the flow coefficient is increased. The invention adopts a mixed air inlet mode of directly air inlet of the axial main air groove and air inlet of the circumferential air-filling holes, increases the air inlet flow coefficient, increases the air inlet amount, can avoid air flow interference and ensures that the air paths reach balance. The air supply efficiency of the engine is effectively improved.

Drawings

FIG. 1 is a schematic diagram of the structure of the present invention;

FIG. 2 is an enlarged view of the valve core assembly structure of the present invention;

FIG. 3 is a schematic diagram of the gas path of the present invention;

fig. 4 is a three-dimensional structure diagram of the valve core structure.

Detailed Description

The invention is described in more detail below, by way of example, with reference to the accompanying drawings:

referring to fig. 1-4, fig. 1 is a schematic diagram of an overall structure of a coaxial dual electromagnetic fuel gas injection valve with adjustable cross-sectional flow area, which comprises a valve body 1, a main electromagnet, a secondary electromagnet, a valve rod 7, a small valve core 12, a T-shaped armature 6, a valve core assembly 11 and a valve seat 14. The secondary core 2 is connected with the valve body 1 by upper threads. The main electromagnet mainly comprises an iron core 8 and a coil 9. Annular grooves for arranging a main return spring 10 are formed on two sides of the iron core 8, and a valve core assembly 11 is arranged below the iron core 8. The secondary electromagnet mainly comprises a secondary iron core 2 and a secondary coil 3. The method is characterized in that: annular grooves for arranging a secondary return spring 4 are formed on two sides of the secondary iron core 2, and a T-shaped armature 6 is arranged below the secondary iron core 2. The valve rod 7 is fixed on the valve rod 7 through the screw 5 and the T-shaped armature 6, and the small valve core 12 is fixed on the valve rod 7 through threads below the valve rod 7, so that the perpendicularity of the valve rod 7 is ensured. The small valve core 12 is positioned in the center of the valve core assembly 11, and the small valve core 12 and the valve rod 7 are made of nonmetallic materials. The movement of the small valve core 12 is positioned with the main electromagnet through the valve rod 7, and is limited by the distance between the T-shaped armature 6 and the secondary electromagnet.

The valve core assembly 11 shown in fig. 2 mainly comprises an armature 15, a spring seat 16, a fastening bolt 20, a gasket 17, a bottom plate 19 and a valve core 21. The method is characterized in that: the armature 15, the washer 17, the bottom plate 19 and the valve core 21 are linked together by a fastening bolt 20, and the spring seat 16 is mounted on the bottom plate 19. The armature 15 is provided with an internal diversion cavity 29, the bottom plate 19 is provided with a certain number of pressure balance grooves 18, so that the armature 15 is prevented from being subjected to axial force, the internal and external air path pressures at the armature 15 are more easily balanced, and the response speed of the armature 15 is improved; the main return spring 10 is located between the core 8 and the spring seat 16.

When a smaller flow is needed, the secondary coil 3 is electrified, the secondary iron core 2 and the T-shaped armature 6 are magnetized, a magnetic loop is formed between the secondary iron core 2 and the T-shaped armature 6, and the T-shaped armature 6 overcomes the pretightening force of the secondary reset spring 4 under the action of electromagnetic force and then drives the valve rod 7 to move upwards. The valve rod 7 drives the small valve core to move upwards, and the small valve core 12 of the electromagnetic valve is opened, so that the jet with smaller flow is realized. When a large flow is needed, the coil 9 is electrified, the iron core 8 and the armature 15 are magnetized, a magnetic loop is formed between the iron core 8 and the armature 15, the armature 15 moves upwards after overcoming the pretightening force of the main reset spring 10 under the action of electromagnetic force, the armature 15 drives the whole valve core assembly 11 to move upwards, and the electromagnetic valve is completely opened, so that large-flow air injection is realized. Throughout the movement, the axial movement and circumferential positioning of the armature 15 are controlled by the cooperation between the 4 guide blocks 13 on the valve seat 35 and the valve core 21 until the upper surface of the spring seat 16 contacts the lower surface of the core 8. When the electromagnetic valve is required to be closed, the coil 9 and the secondary coil 3 are powered off, the electromagnetic force borne by the armature 15 and the T-shaped armature 6 disappears, the armature 15 and the T-shaped armature 6 respectively move downwards under the action of the main return spring 10 and the secondary return spring 4 until the armature 15 and the T-shaped armature 6 return to the initial positions again, and the electromagnetic valve is closed. The four ribs 23 of the valve core 21 are respectively provided with 2 circumferential air supply holes 24, so that the response speed is improved, the flow area is increased, the quality is reduced, and the reliability is improved. An outlet annulus 30 with a certain angle is arranged at the circumferential air supplementing hole 24, so that the flow loss is reduced, and the flow coefficient is increased. The mixed air inlet mode of direct air inlet of the axial main air groove 39 and air inlet of the circumferential air-filling holes 24 is adopted, the air inlet flow coefficient is increased, the air inlet amount is increased, and meanwhile, air flow interference can be avoided, so that the air path reaches balance. The air outlet ring belt 30 is adopted between the valve core 21 and the valve seat 35, the surface is sealed, the pressure is stabilized and balanced, the impact can be reduced by the wider ring belt area, and the reliability is improved.

As shown in fig. 3, when the small flow jet is performed, the gas flows vertically into the valve body 1 through the gas inlet 26, flows into the valve body 1 along the flow guiding cavity 27, and after the secondary coil 3 is electrified, the small valve core 12 rises, the gas flows into the middle space of the valve core assembly 11 along the inner flow guiding cavity 29 and the pressure balancing groove 18, and then flows out through the central gas outlet hole. When the high-flow air injection is performed, after the coil 9 is electrified, the armature 15 moves upwards under the action of electromagnetic force to overcome the pretightening force of the main reset spring 10, the valve core 21 is driven to move upwards to be separated from the surface of the valve seat 35, at the moment, the air passage is opened, the electromagnetic valve is opened, air flows in a mixed air inlet mode of the axial main air groove 39 and the circumferential air supplementing holes 24, passes through a plurality of annular cavities 28 which are distributed in a staggered mode, and finally flows out vertically from the air outlet 31; the coil 9 is powered off, the electromagnetic force received by the armature 15 disappears, the armature 15 moves downwards under the action of the return spring between the iron core 8 and the spring seat 16 to drive the valve core 21 to move downwards until the surface of the valve core 21 is attached to the surface of the valve seat 35, the initial position is restored, the air passage is closed, and the electromagnetic valve is closed.

According to the working process, the coaxial double-electromagnetic fuel gas injection valve with the adjustable flow cross section disclosed by the invention realizes adjustable gas flow through a double-valve-core double-electromagnet control structure. According to the invention, the inner diversion cavity 29 is formed in the center of the armature 15, and a certain number of pressure balance grooves 18 are formed in the bottom plate 19, so that the armature 15 is prevented from receiving axial force, the pressure of an inner air passage and an outer air passage at the armature 15 is more easily balanced, and the response speed of the armature 15 is improved; the four ribs 23 of the valve core 21 are provided with circumferential air supply holes 24, so that the flow area is increased, the quality of the valve core 21 is reduced, and the reliability is improved. An air outlet ring belt 30 with a certain angle is arranged at the circumferential air filling hole 24 of the valve core 21, so that the flow loss is reduced, and the flow coefficient is increased. The invention adopts a mixed air inlet mode of directly air inlet of the axial main air groove 39 and air inlet of the circumferential air-filling holes 24, increases the air inlet flow coefficient, increases the air inlet amount, can avoid air flow interference and ensures that the air paths reach balance. The air supply efficiency of the engine is effectively improved.

The technical scheme of the invention is as follows: the coaxial double electromagnetic gas injection valve with adjustable flow cross section consists of four parts, including valve body, main electromagnet, secondary electromagnet, valve core assembly, valve rod, small valve core and valve seat. The main electromagnet and the secondary electromagnet are connected with the valve body through threads above the main electromagnet and the secondary electromagnet. The main electromagnet mainly comprises an iron core and a coil. Annular grooves for arranging a main return spring are formed in two sides of the iron core, and the valve core assembly is arranged below the iron core. The valve core assembly mainly comprises an armature, a spring seat, a fastening bolt, a gasket, a bottom plate and a valve core. The armature, the gasket, the bottom plate and the valve core are linked together through a fastening bolt, the spring seat is arranged on the bottom plate, a certain number of pressure balance grooves are formed in the bottom plate, and the armature is provided with an internal diversion cavity. The return spring is located between the iron core and the spring seat. Four ribs of the valve core are respectively provided with a plurality of circumferential air supply holes. The secondary electromagnet mainly comprises a secondary iron core and a secondary coil. Annular grooves for arranging a secondary return spring are formed in two sides of the secondary iron core, and a T-shaped armature is arranged below the secondary iron core. The valve rod is fixed on the T-shaped armature through the fixing screw, and the small valve core is fixed on the valve rod through threads below the valve rod, so that the perpendicularity of the valve rod is guaranteed. The small valve core is positioned in the center of the valve core assembly, and the small valve core and the valve rod are made of nonmetallic materials. The movement of the small valve core is positioned with the main electromagnet through the valve rod, and is limited through the distance between the T-shaped armature iron and the secondary electromagnet. Three air outlet annular zones are adopted between the valve core and the valve seat, the surfaces are sealed, the pressure is stabilized and balanced, and the valve core and the valve seat have wider annular zone areas. The valve core is circumferentially fixed on 4 guide blocks on the valve seat, so that the perpendicularity of the valve core is guaranteed, and the valve core moves up and down to be limited by the distance between the spring seat and the iron core.

Claims

1. The utility model provides an adjustable cross sectional area coaxial type double electromagnetic gas injection valve, its characterized in that: comprises a valve body, a main electromagnet, a secondary electromagnet, a valve core assembly, a valve rod, a T-shaped armature, a small valve core and a valve seat, wherein the valve seat is fixed below the valve body, the main electromagnet comprises an iron core and a main reset spring, a coil is wound in the iron core and is provided with an annular groove, the secondary electromagnet comprises a secondary iron core and a secondary reset spring, the secondary iron core is wound with a secondary coil and is provided with an annular groove, the secondary iron core is fixed with the upper end of the valve body, the iron core is positioned below the secondary iron core, the T-shaped armature is arranged between the iron core and the secondary iron core, the upper surface of the T-shaped armature is provided with the annular groove, the annular groove of the T-shaped armature and the annular groove of the secondary iron core are provided with a secondary reset spring, the valve core assembly comprises an armature, a spring seat, a bottom plate, a valve core, an armature, a bottom plate and valve cores are arranged from top to bottom and are connected together through fastening bolts, the spring seat is positioned outside the armature and forms an annular groove with the armature, two ends of the main return spring are respectively arranged in the annular groove of the iron core and the annular groove of the spring seat, the bottom plate is provided with a pressure balance groove, the valve core is provided with a sealing annular belt and ribs, the sealing annular belt forms an annular cavity, the valve seat is provided with an air outlet annular belt and a guide block, the guide block is positioned around the valve core, the air outlet annular belt is positioned below the annular cavity, the air outlet is arranged below the annular cavity, the upper surface of the valve core is provided with an axial main air groove, the ribs are provided with circumferential air supplementing holes, the air supplementing holes are provided with flow guiding cone angles, the upper end of the valve rod is fixed with the T-shaped armature, the lower end of the valve rod sequentially penetrates through the iron core, the armature, the bottom plate and the valve core and is fixed with the small valve core, the small valve core is positioned on the valve seat, and the valve seat below the small valve core is provided with an air outlet.

2. The coaxial double electromagnetic fuel gas injection valve with adjustable cross-sectional flow area according to claim 1, wherein the valve is characterized in that: the small valve core and the valve rod are both made of nonmetallic materials.

3. The coaxial double electromagnetic fuel gas injection valve with adjustable cross-sectional flow area according to claim 1 or 2, characterized in that: when the small flow is needed, the secondary coil is electrified, the T-shaped armature overcomes the pretightening force of the secondary reset spring under the action of electromagnetic force and then drives the valve rod to move upwards, the valve rod drives the small valve core to move upwards, and the air outlet hole sprays air; when a large flow is needed, the coil is electrified, the armature moves upwards after overcoming the pretightening force of the main reset spring under the action of electromagnetic force, and the armature drives the whole valve core assembly to move upwards, and the air outlet is sprayed with air; when the air injection needs to be closed, the coil and the secondary coil are powered off, the armature and the T-shaped armature move downwards under the action of the main reset spring and the secondary reset spring respectively until the armature and the T-shaped armature return to the initial positions again, and the air injection is finished.