CN107131076B - A Straight-through Inner Guided Gas Injection Valve with Floating Seat - Google Patents

Abstract

The invention aims to provide the straight-through type internal guide gas injection valve with the floating valve seat, which realizes the reverse leakage function caused by unbalanced internal and external pressure of the gas injection valve through the floating valve seat structure, and ensures the working reliability of the gas injection valve; 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 inner guide structure is matched with the pressure balance hole and the pressure balance groove, so that the perpendicularity of the valve core is ensured, the stable work and the reliable work 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 injection efficiency of the engine is effectively improved, the air flow interference can be avoided, and the stability of the 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

A Straight-through Inner Guided Gas Injection Valve with Floating Seat

technical field

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

Background technique

With the increasingly stringent emission regulations of ships and the rising fuel prices, gas engines and dual-fuel engines are becoming more and more important in the international market. As a key component of gas engines and dual-fuel engines, the fuel injection system's performance directly affects the power and emissions of the engine. Gas injection valve is one of the core components of gas fuel electronically controlled multi-point injection gas engine including dual fuel engine. It can realize timing, quantitative, staged gas supply and intake stratification for each cylinder. Its working performance has a very important impact on the power and emission of gas engine or dual fuel engine. In the case of severe engine operating conditions, the injection valve is prone to reverse leakage. Therefore, it is necessary to design an injection valve with anti-back leakage function. At the same time, it is necessary to develop a large-flow gas injection valve with fast response speed, high control precision and good reliability, so that its flow capacity can meet the normal working requirements of natural gas engines under high load conditions.

Contents of the invention

The object of the present invention is to provide a straight-through inner-guided gas injection valve with a floating valve seat, which has fast response speed, stable gas injection, high reliability and anti-reverse leakage function.

The purpose of the present invention is achieved like this:

The present invention is a straight-through internally guided gas injection valve with a floating valve seat, which is characterized in that it includes a valve body, an electromagnet, a valve core assembly, and a floating valve seat. The electromagnet includes an iron core, the iron core is fixed on the upper end of the valve body, a coil is wound inside the iron core, and an annular groove is arranged in the iron core; the valve core assembly includes an armature, a spring seat, a bottom plate, and a valve core. The armature, the bottom plate, and the valve core are arranged from top to bottom and connected together by fastening bolts. The two ends of the spring are respectively arranged in the annular groove of the iron core and the annular groove of the spring seat. A guide pin is installed at the center of the armature. The guide pin is fixed together by a circlip and the armature. The guide pin extends into the iron core. An auxiliary return spring is set in the iron core. A sealing ring and a rib are arranged, the sealing ring forms a ring cavity, the upper surface of the valve core is provided with an axial main air groove, and the rib is provided with a circumferential air supply hole; the floating valve seat includes a guide base and a valve seat, the guide base is fixed below the valve body, the valve seat is located under the valve core, the inner ring of the guide base is provided with a T-shaped structure, the outer ring of the valve seat is installed in the guide base by setting a T-shaped structure matched with it, the two ends of the valve seat return spring are respectively fixed on the valve seat and the valve core, the valve seat is provided with an air outlet ring, and the outlet ring is located below the ring cavity, An air outlet is arranged below the air outlet ring.

The present invention may also include:

1. Two anti-leakage structures are installed between the valve seat and the guide base. The first anti-leakage structure is to install a deformable sealing ring above the connection between the valve seat and the guide base, and a compression washer is installed on the inner edge of the deformable sealing ring. The second anti-leakage structure is to set two layers of sealing rubber rings at the T-shaped structure connection between the valve seat and the guide base, and an elastic gasket is installed at the T-shaped structure connection between the valve seat and the guide base.

2. An air inlet is formed between the upper part of the iron core and the valve body, and a diversion cavity is formed between the middle and lower parts of the iron core and the valve body. Under the action of the return spring between the core and the spring seat, the armature drives the valve core to move downward until the surface of the valve core fits the surface of the valve seat and returns to the initial position, the air circuit is closed, and the solenoid valve is closed.

The advantages of the present invention are: the present invention adopts a structure with a floating valve seat, which can effectively prevent reverse leakage of the gas injection valve and has the function of shock absorption, ensuring the reliability and safety of the gas injection valve; the present invention opens a pressure balance hole in the center of the guide pin and a certain number of pressure balance grooves on the bottom plate to prevent the armature from being subjected to axial force, making it easier to balance the internal and external gas path pressure at the armature, and improve the response speed of the armature; the present invention increases the flow area and reduces the quality of the valve core by opening circumferential air supply holes on the four ribs of the valve core. , improve reliability. A certain diversion cone angle is set at the air supply hole in the circumferential direction of the valve core to reduce flow loss and increase flow coefficient. The invention adopts the mixed air intake mode of direct air intake from the axial main air groove and air intake from the circumferential air supply hole, increases the air flow coefficient, increases the air intake volume, and can avoid air flow interference at the same time, so that the air path can be balanced. Effectively improve the jet efficiency of the engine.

Description of drawings

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

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

Fig. 3 is the floating valve seat structure enlarged view of the present invention;

Figure 4 is a schematic diagram of the direction of the gas path;

Fig. 5 is a top view of the spool structure;

Fig. 6 is a three-dimensional structural diagram of the spool structure;

Figure 7 is a force diagram of the floating valve seat.

Detailed ways

The present invention is described in more detail below in conjunction with accompanying drawing example:

Combining Figures 1-7, Figure 1 is a schematic diagram of the overall structure of the straight-through inner-guided gas injection valve with a floating valve seat of the present invention, including four parts: a valve body 1, an electromagnet 2, a valve core assembly 3, and a floating valve seat 4. The electromagnet 2 is connected with the valve body 1 through the upper thread. The electromagnet 2 is mainly composed of an iron core 5 and a coil 6 . The two sides of the iron core 5 are provided with annular grooves for arranging the main return spring 7, and the center of the iron core 5 is provided with a straight groove of a certain depth, and the guide pin 9 between the iron core 5 and the armature 10 is arranged inside the straight groove.

Fig. 2 shows that the spool assembly 3 is mainly composed of a guide pin 9, an armature 10, a spring seat 14, a fastening bolt 19, a gasket 15, a bottom plate 16, and a spool 20. The feature is that the armature 10 , gasket 15 , bottom plate 16 and valve core 20 are linked together by fastening bolts 19 , and the spring seat 14 is installed on the bottom plate 16 . There is a pressure balance hole 12 in the center of the guide pin 9, and a certain number of pressure balance grooves 13 are opened on the bottom plate 16 to prevent the armature 10 from being subjected to axial force, so that the internal and external pressure of the armature 10 can be more easily balanced, and the response speed of the armature 10 can be improved; The main return spring 7 is located between the iron core 5 and the spring seat 14 , and the auxiliary return spring 8 is located between the guide pin 9 and the iron core 5 . After the coil 6 is energized, the iron core 5 and the armature 10 are magnetized, and a magnetic circuit is formed between the iron core 5 and the armature 10. The armature 10 is subjected to electromagnetic force to overcome the pretightening force of the main return spring 7 and the auxiliary return spring 8 and then moves upward. Power off, the electromagnetic force received by the armature 10 disappears, under the action of the main return spring 7 between the iron core 5 and the spring seat 14 and the auxiliary return spring 8 between the guide pin 9 and the iron core 5, the armature 10 moves downward until the armature 10 returns to the initial position.

On the four ribs 21 of the valve core 20, two circumferential air supply holes 22 are respectively opened to improve the response speed, increase the flow area, reduce the mass and improve the reliability at the same time. A certain diversion cone angle is set at the circumferential air supply hole 22 to reduce flow loss and increase flow coefficient. Adopting the mixed air intake method of direct air intake from the axial main air groove 35 and air intake from the circumferential air supply hole 22, the air intake flow coefficient is increased, the air intake volume is increased, and the air flow interference can be avoided at the same time, so that the air path can be balanced. The valve core 20 and the valve seat 31 adopt the structure of the air outlet ring 18, the surface is sealed, the pressure is stabilized and balanced, and the wider ring area can reduce the impact and improve the reliability.

The gas circuit is shown in Figure 4. The gas flows vertically into the valve body 1 from the air inlet 32, and flows into the valve body 1 along the diversion chamber 33. After the coil 6 is energized, the armature 10 is subjected to the electromagnetic force to overcome the pretightening force of the main return spring 7 and the auxiliary return spring 8 and then moves upward, driving the valve core 20 to move upward and separate from the surface of the valve seat 31. The air port 34 flows out vertically; the coil 6 is powered off, and the electromagnetic force received by the armature 10 disappears. Under the action of the return spring between the iron core and the spring seat 14, the armature 10 moves downward, driving the valve core 20 to move downward until the surface of the valve core 20 fits with the surface of the valve seat 31 and returns to the initial position, the air circuit is closed, and the solenoid valve is closed.

As shown in Fig. 3, in order to prevent the reverse gas leakage and improve the reliability and safety of the gas injection valve, the present invention adopts the floating valve seat 4 structure. The floating valve seat 4 can lock the solenoid valve when the external pressure of the solenoid valve is high and the internal pressure is high, effectively preventing the reverse leakage of gas. Floating valve seat 4 is made up of 7 parts: guide base 30, valve seat 31, and valve seat return spring 28, sealing rubber ring 27, compression washer 24, deformable sealing ring 25, elastic washer 26. The guide base 30 is fixed on the valve body 1 by bolts, and the valve seat 31 is installed on the guide base 30 . The inner ring of the guide base 30 has a T-shaped structure, which matches the T-shaped structure of the outer ring of the valve seat 31 . The two ends of the valve seat return spring 28 are respectively fixed on the valve seat 31 and the valve core 20, and maintain a certain pretightening force.

In order to prevent air leakage between the valve seat 31 and the guide base 30, two anti-leakage structures are installed between the valve seat 31 and the guide base 30. The first anti-leakage structure is to install a deformable sealing ring 25 above the connection between the valve seat 31 and the guide base 30. The outer edge of the deformable seal ring 25 is pressed into the installation groove on the guide base 30 and the valve body 1, and is fixed by the bolt pre-tightening force between the guide base 30 and the valve body 1. A compression washer 24 is installed along the top of the deformable sealing ring 25, and is fixed on the valve seat 31 by screws 29. The compression washer 24 ensures uniform stress and enhances sealing performance. The material of the deformable sealing ring 25 is deformable soft plastic to ensure that it does not affect the movement of the valve seat 31 . The second heavy seal is that two layers of sealing rubber rings 27 are installed at the T-shaped connection between the valve seat 31 and the guide base 30 to further enhance the sealing performance. A layer of elastic washer 26 is added to the T-shaped connection between the valve seat 31 and the guide base 30 to reduce the vibration impact force during contact and play a role in shock absorption. Effectively increase the reliability of the solenoid valve.

The valve seat 31 is affected by the elastic force F4 of the valve seat return spring 28 , the external gas pressure F1 and F2 of the solenoid valve, the internal gas pressure F3 of the solenoid valve and the pressing force of the valve core 20 . The spool 20 is acted by the elastic force of the return spring. When the air pressure below the solenoid valve is greater than the internal pressure of the solenoid valve, the external gas pressures F1 and F2 of the solenoid valve act on the bottom of the valve seat 31 and the gas outlet ring 18 respectively. The contact area under the valve seat 31 is much larger than the gas outlet ring 18. Therefore, F1 is much larger than F2. Before the external gas pressure expands to cause the valve core 20 to move upward, the external gas pressure overcomes the spring preload of the return spring, and the valve seat 31 moves upward together with the valve core 20. The valve seat 31 moves upward until the spring seat 14 contacts the electromagnet. At this moment, even if the electromagnet is energized, the spool 20 cannot move upwards, and the electromagnetic valve cannot be opened. The solenoid valve is locked.

When the internal and external air pressure of the electromagnetic valve returns to normal, the valve seat 31 moves downward under the action of the valve seat return spring 28 and returns to its original position. If the electromagnet is energized at this time, the spool 20 remains motionless, and the electromagnetic valve is normally opened. When the electromagnetic valve is intended to be closed, the electromagnet is de-energized, and the spool 20 moves downward under the action of the return spring, and the electromagnetic valve is closed. If the electromagnet is not energized at this time, the valve seat 31 and the valve core 20 move downwards and return to the original position together with the valve core 20, and the electromagnetic valve remains closed. When wanting to open the electromagnetic valve, the electromagnet is energized, and the spool 20 moves upward under the drive of the armature 10, and the electromagnetic valve is normally opened.

From the above working process, it can be seen that the straight-through type internal guide gas injection valve with floating valve seat 4 of the present invention adopts the structure with floating valve seat 4, which can effectively prevent the reverse leakage of the gas injection valve when the internal and external air pressure of the injection valve is abnormal, and has the function of shock absorption, ensuring the reliability and safety of the gas injection valve. The internal and external air path pressures are easier to achieve balance, and the response speed of the armature 10 is improved; the structure of opening circumferential air supply holes 22 on the four ribs 21 of the valve core 20 increases the flow area, reduces the quality of the valve core 20, and improves reliability. A diversion cone angle of a certain angle is set at the circumferential air hole 22 of the valve core 20 to reduce flow loss and increase the flow coefficient. The present invention adopts the mixed air intake mode of direct air intake from the axial main air groove 35 and air intake from the circumferential air supply hole 22, which increases the air intake flow coefficient, increases the air intake volume, and can avoid air flow interference at the same time, so that the air path can be balanced. Effectively improve the jet efficiency of the engine.

The technical solution of the present invention: a straight-through internally guided gas injection valve with a floating valve seat, which is composed of four parts: a valve body, an electromagnet, a valve core assembly, and a floating valve seat. The electromagnet is connected together with the valve body through its upper thread. The electromagnet is mainly composed of iron core and coil. The two sides of the iron core are provided with an annular groove for the main return spring, and the center of the iron core is provided with a straight groove of a certain depth, and the guide pin between the iron core and the armature is arranged inside the straight groove. The spool assembly is mainly composed of an armature, a spring seat, fastening bolts, gaskets, a bottom plate and a spool. It is characterized in that the armature, gasket, bottom plate and valve core are connected together by fastening bolts, the spring seat is installed on the bottom plate, and a certain number of pressure balance grooves are opened on the bottom plate. The main return spring is located between the iron core and the spring seat. There is a pressure balance hole in the center of the guide pin. The guide pin and the armature are fixed together by a circlip. The auxiliary return spring is located between the guide pin and the iron core. The ribs of the spool are respectively provided with a plurality of circumferential air supply holes. The valve core and the valve seat adopt three outlet ring belt structures, the surface is sealed, the pressure is stable and balanced, and it has a wide ring belt area. The floating valve seat is composed of a guide base, a valve seat, and a valve seat return spring, a sealing rubber ring, a compression washer, a deformable sealing ring, and an elastic washer. It is characterized in that the guide base is fixed on the valve body through bolts, and the valve seat is installed on the guide base. The inner ring of the guide base has a T-shaped structure, which matches the T-shaped structure of the outer ring of the valve seat. The two ends of the valve seat return spring are respectively fixed on the valve seat and the valve core, and a certain pretightening force is maintained. Two anti-leakage structures are installed between the valve seat and the guide base. The first anti-leakage structure is to install a deformable sealing ring above the connection between the valve seat and the guide base. The outer edge of the deformable seal ring is pressed into the installation groove on the guide base and the valve body, and is fixed by the bolt pre-tightening force between the guide base and the valve body. A compression washer is installed above the inner edge of the deformable sealing ring, and is fixed on the valve seat by screws. The material of the deformable sealing ring is deformable soft plastic to ensure that it does not affect the movement of the valve seat. The second seal is to install two layers of sealing rubber rings at the T-shaped connection between the valve seat and the guide base.

Claims (3)

1. A straight-through internally guided gas injection valve with a floating valve seat, which is characterized in that it includes a valve body, an electromagnet, a valve core assembly, and a floating valve seat. The electromagnet includes an iron core, and the iron core is fixed on the upper end of the valve body. A coil is wound inside the iron core, and an annular groove is arranged in the iron core; The two ends of the return spring are respectively arranged in the annular groove of the iron core and the annular groove of the spring seat. A guide pin is installed at the center of the armature. The guide pin is fixed together by the circlip and the armature. The guide pin extends into the iron core. An auxiliary return spring is set in the iron core. The upper surface of the valve core is provided with a sealing ring and a rib, and the sealing ring forms a ring cavity. The upper surface of the valve core is provided with an axial main air groove, and the rib is provided with a circumferential air supply hole; , an air outlet is arranged below the air outlet ring. 2. A straight-through internally guided gas injection valve with a floating valve seat according to claim 1, characterized in that: two anti-leakage structures are set between the valve seat and the guide base, the first anti-leakage structure is to install a deformable sealing ring above the connection between the valve seat and the guide base, and a compression washer is installed on the inner edge of the deformable sealing ring, and the second anti-leakage structure is to set two layers of sealing rubber rings at the T-shaped structure connection between the valve seat and the guide base, and an elastic gasket is installed at the T-shaped structure connection between the valve seat and the guide base . 3. A straight-through internally guided gas injection valve with a floating valve seat according to claim 1 or 2, characterized in that: an air inlet is formed between the upper part of the iron core and the valve body, and a diversion chamber is formed between the middle and lower part of the iron core and the valve body, and the air inlet and the diversion chamber are connected; the gas flows into the valve body vertically from the air inlet, and flows into the valve body along the diversion chamber. After the coil is energized, the armature drives the valve core to move upwards and separate from the surface of the valve seat. The mixed air intake of the air hole flows in, passes through the ring cavity, and flows out vertically from the air outlet; after the coil is powered off, under the action of the return spring between the iron core and the spring seat, the armature drives the valve core to move downward until the surface of the valve core fits with the surface of the valve seat and returns to the initial position, the air circuit is closed, and the solenoid valve is closed.