Injection valve, engine and pressure balancing method

Abstract

The present invention provides an injection valve, an engine and a pressure balancing method. The injection valve includes a driving part, including a first chamber and a second chamber, wherein the first chamber is located above the second chamber and is isolated from each other; an introduction part, which is fluidically connected to the first chamber to introduce a first fluid to generate a first pressure; an inlet part, which is fluidically connected to the second chamber to flow in a second fluid to generate a second pressure; an outlet part, which can be fluidically connected to the inlet part to flow out a second fluid; a first valve plate, including a first flow channel, which is fluidically connected to the inlet part; a second valve plate, including a second flow channel, which is fluidically connected to the outlet part; wherein the first pressure, the second pressure and the pressure of the outlet part are balanced.

Description

Technical Field

[0001] The invention relates to an injection valve, an engine and a pressure balancing method. Background Art

[0002] Driven by the dual carbon goals, ammonia fuel engines are one of the effective ways to reduce carbon emissions. Due to the low calorific value of ammonia, it often requires more mass to produce the same work compared to common fuels such as natural gas, so the injection device needs to have a larger injection flow, larger volume and higher injection pressure. Since ammonia is also corrosive and toxic, its injection device is also easily troubled by problems such as insufficient injection flow, severe friction and wear, material corrosion, and large component volume. Summary of the invention

[0003] An object of the present invention is to provide an injection valve.

[0004] Another object of the present invention is to provide an engine.

[0005] Another object of the present invention is to provide a pressure balancing method for an injection valve.

[0006] According to one aspect of the present invention, an injection valve comprises: a driving part, comprising a first chamber and a second chamber, the first chamber being located at the upper part of the second chamber and being isolated from each other; an introduction part, fluidically connected to the first chamber, so as to introduce a first fluid to generate a first pressure; an inlet part, fluidly connected to the second chamber, so as to allow a second fluid to flow in and generate a second pressure; an outlet part, capable of fluidly connecting to the inlet part, so as to flow out the second fluid; a first valve plate, comprising a first flow channel, which is fluidically connected to the inlet part; a second valve plate, comprising a second flow channel, which is fluidically connected to the outlet part; wherein the first valve plate is fixedly connected to the driving part, and the driving part drives the first valve plate to move axially relative to the second valve plate, controls the on-off connection between the first flow channel and the second flow channel, so as to allow or block the second fluid from the inlet part to flow to the outlet part; the first pressure, the second pressure and the pressure of the outlet part are balanced.

[0007] The technical solution of the present application is to set a first chamber and a second chamber that are isolated from each other, and the introduction part introduces the first fluid into the first chamber, and the inlet part introduces the second fluid into the second chamber. The seal of the first chamber will not leak to the second chamber and the first flow channel, so as to form a pressure balance structure, so that the injection valve can be sprayed under any inlet and outlet pressure difference, and the injection flow rate is increased under the condition of limited injection valve volume. At the same time, it avoids the failure of the injection valve to open abnormally when the back pressure of the outlet is large, and the structure is compact. In addition, the second fluid will not enter the first chamber, preventing the second fluid burned as fuel from being corrosive and corroding the first chamber, thereby improving the reliability of the injection valve and extending its service life. It is particularly suitable for injection valves used as ammonia fuel. On the basis of achieving precise injection, it can also prevent the corrosion of ammonia gas, and has good reliability and service life.

[0008] In one or more embodiments of the injection valve, the driving portion includes: a driving member and a follower, the driving member and the follower are axially separated to form the first chamber, and the follower is fixedly connected to the first valve plate; a reset assembly, including a support and a reset member, the reset member has a pre-tightening force, one end of the reset member is embedded in the support, and the other end of the reset member abuts the first valve plate to press the first valve plate against the second valve plate, and the support and the follower form the second chamber; a sealing member, fixedly connected to the follower to isolate the first chamber from the second chamber.

[0009] In one or more embodiments of the injection valve, the driving member includes an electromagnet, the driven member includes an armature; the reset member includes an elastic member, the support has a second hole, and the elastic member is arranged in the second hole; the sealing member includes a dynamic sealing ring, the outer ring side of the dynamic sealing ring is fixedly connected to the support, and the inner ring side of the dynamic sealing ring is fixedly connected to the armature.

[0010] In one or more embodiments of the injection valve, the injection valve includes a first state, a second state, and a third state: in the first state, the first valve plate is pressed against the second valve plate, the inlet portion fills the first chamber with the first fluid, and the inlet portion fills the second chamber with the second fluid, and the first pressure, the second pressure and the pressure of the outlet portion are balanced; in the second state, the drive portion drives the first valve plate to move upward in the axial direction, so that the first flow channel is connected to the second flow channel, and the inlet portion transports the second fluid to the outlet portion; in the third state, the drive portion stops working, and the first valve plate is pressed against the second valve plate again, so that the connection between the first flow channel and the second flow channel is disconnected.

[0011] In one or more embodiments of the injection valve, the first flow channel and the second flow channel are multi-circle annular bands.

[0012] In one or more embodiments of the injection valve, the first fluid is a non-corrosive gas.

[0013] In one or more embodiments of the injection valve, the injection valve also includes a shell, the interior of the shell provides an accommodating space to accommodate the driving part, the first valve plate and the second valve plate; the accommodating space has a shoulder, and the second valve plate has a lug, and the lug abuts against the shoulder to fix the second valve plate; the introduction part and the inlet part are opened on the side wall of the shell, the introduction part is directly connected to the first chamber, and the outlet part is located on the downstream side of the second valve plate.

[0014] According to another aspect of the present invention, an engine comprises an intake passage and the injection valve as described above, wherein an outlet portion of the injection valve is fluidly connected to the intake passage to inject a second fluid into the intake passage.

[0015] In one or more embodiments of the engine, the engine further comprises a post-supercharging intake manifold, and the introduction portion of the injection valve is fluidically connected to the post-supercharging intake manifold to introduce the first fluid into the first chamber of the injection valve.

[0016] According to another aspect of the present invention, a pressure balancing method for an injection valve comprises: an introduction part introduces a first fluid into a first chamber of a driving part to generate a first pressure; an inlet part introduces a second fluid into a second chamber of the driving part to generate a second pressure, and the inlet part also transports the second fluid to an outlet part through the connection between the first flow channel and the second flow channel; wherein the first pressure, the second pressure and the pressure of the outlet part are balanced. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The above and other features, properties and advantages of the present invention will become more apparent through the following description in conjunction with the accompanying drawings and embodiments. In the accompanying drawings, the same reference numerals always represent the same features. It should be noted that these drawings are only examples and are not drawn according to the conditions of equal scale, and should not be used as a limitation on the actual scope of protection required by the present invention, wherein:

[0018] Figure 1 It is the injection mode of the urea nozzle of the post-treatment system;

[0019] Figure 2 A schematic structural diagram of a fuel injection valve according to an embodiment;

[0020] Figure 3 The schematic diagram of the pressure balance structure of the fuel injection valve according to one embodiment.

[0021] Reference numerals:

[0022] 200-flow controller, 300-urea nozzle;

[0023] 100-injection valve;

[0024] 1- driving part;

[0025] 101- first chamber;

[0026] 102 - second chamber;

[0027] 11-driving member, 11'-electromagnet;

[0028] 12- follower, 12'- armature, 121- armature plate, 122- column;

[0029] 13-magnetic isolation ring, 131-first hole;

[0030] 2-Introduction part;

[0031] 3- Import department;

[0032] 4-Export department;

[0033] 5-first valve plate;

[0034] 501-first flow channel;

[0035] 502-non-annular surface;

[0036] 51- screw;

[0037] 6-second valve plate, 61-lug;

[0038] 601-Second flow channel

[0039] 7- Reset component;

[0040] 71-support, 711-second hole;

[0041] 72-reset member, 72'-elastic member;

[0042] 8- Seal;

[0043] 8'-dynamic sealing ring, 81-outer ring side of the dynamic sealing ring, 82-inner ring side of the dynamic sealing ring; 83-fixed sleeve;

[0044] 9-housing, 901-side wall of the housing;

[0045] 91-accommodation space, 911-shoulder;

[0046] 92-O-ring;

[0047] 10-Leakage collection ring groove. DETAILED DESCRIPTION

[0048] Reference will now be made in detail to various embodiments of the present invention, examples of which are shown in the accompanying drawings and described below. Although the present invention will be described in conjunction with the exemplary embodiments, it should be appreciated that this specification is not intended to limit the present invention to those exemplary embodiments. On the contrary, the present invention is intended to cover not only these exemplary embodiments, but also various alternative forms, modifications, equivalent forms and other embodiments that may be included within the spirit and scope of the present invention as defined by the appended claims.

[0049] In the following description, the orientation or positional relationship indicated by "inside", "outside", "upper", "lower", or other directional terms is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or component referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0050] At the same time, the present application uses specific words to describe the embodiments of the present application. For example, "some embodiments" means a certain feature, structure or characteristic related to at least one embodiment of the present application. Therefore, it should be emphasized and noted that "some embodiments" mentioned twice or multiple times in different locations in this specification do not necessarily refer to the same embodiment. In addition, some features, structures or characteristics of some embodiments of the present application can be appropriately combined.

[0051] At present, the existing ammonia injection equipment is mostly used in post-treatment systems, and the relevant structures are as follows: Figure 1 As shown, ammonia is injected by the urea nozzle 300 through the flow controller 200. The inventors have found that the existing ammonia injector does not have the function of accurately injecting ammonia in a timely and quantitative manner, and the existing gas injection valve with accurate injection function is easily corroded by ammonia, and has the defects of poor reliability, short service life, low injection pressure, and limited injection amount.

[0052] Based on the above, the inventor has conducted in-depth research and designed an injection valve. By setting a first chamber and a second chamber that are isolated from each other, the introduction part introduces the first fluid into the first chamber, and the inlet part introduces the second fluid into the second chamber. The seal of the first chamber will not leak into the second chamber or the first flow channel, thus forming a pressure balance structure, so that the injection valve can be injected under any inlet and outlet pressure difference, and the injection flow rate is increased under the condition of limited injection valve volume. At the same time, it avoids the failure of the injection valve to open abnormally when the back pressure of the outlet is large, and the structure is compact. In addition, the second fluid will not enter the first chamber, preventing the second fluid burning as fuel from being corrosive and corroding the first chamber, thereby improving the reliability of the injection valve and extending its service life. It is particularly suitable for injection valves used as ammonia fuel. On the basis of achieving precise injection, it can also prevent the corrosion of ammonia gas, and has good reliability and service life.

[0053] Although the injection valve disclosed in the embodiment of the present application is suitable for ammonia injection to achieve the effect of improving emissions and economy, it is not limited to this and can also be applied to the injection of other corrosive fuels or non-corrosive fuels, as long as the engine can be applied to the injection valve disclosed in the present application. The second fluid injected by the outlet of the injection valve described below takes ammonia as an example.

[0054] refer to Figure 2As shown, in one embodiment, the specific structure of the injection valve 100 may include a driving part 1, an introduction part 2, an inlet part 3, an outlet part 4, a first valve plate 5, and a second valve plate 6. The driving part 1 includes a first chamber 101 and a second chamber 102, wherein the first chamber 101 is located at the upper part of the second chamber 102 and is isolated from each other. The meaning of "isolated from each other" here means that there is no fluid exchange between the first chamber 101 and the second chamber 102, that is, the fluid in the first chamber 101 will not flow into the second chamber 102, and the fluid in the second chamber 102 will not flow into the first chamber 101. The introduction part 2 is fluidically connected to the first chamber 101 to introduce the first fluid to generate a first pressure P1. The inlet part 3 is fluidically connected to the second chamber 102 to flow in the second fluid to generate a second pressure P2. The outlet part 4 can be fluidically connected to the inlet part 3 to flow out the second fluid. The "second fluid" here refers to the fuel input from the inlet 3 and sprayed out from the outlet 4 to mix with the air and burn. It can be liquid or gas, which is different from the "first fluid". The first fluid is a liquid or gas input from the introduction part 2 into the first chamber 101, which plays a role in balancing the pressure. It is not burned as fuel and has a different composition from the second fluid, that is, the sources of the first fluid supplied to the introduction part 2 and the second fluid supplied to the inlet 3 are different. The first valve plate 5 includes a first flow channel 501, which is in fluid communication with the inlet 3. The second valve plate 6 includes a second flow channel 601, which is in fluid communication with the outlet 4. Among them, the first valve plate 5 is fixedly connected to the driving part 1, and the driving part 1 drives the first valve plate 5 to move relative to the second valve plate 6 in the axial direction, controls the connection between the first flow channel 501 and the second flow channel 601, so as to allow or block the second fluid from the inlet 3 to the outlet 4; the first pressure P1, the second pressure P2 and the pressure P of the outlet 4 are balanced.

[0055] The beneficial effect of this embodiment is that, by setting the first chamber 101 and the second chamber 102 which are isolated from each other, the introduction part 2 introduces the first fluid into the first chamber 101, and the inlet part 3 introduces the second fluid into the second chamber 102, and the first chamber 101 seal will not leak to the second chamber 102 and the first flow channel 501, so as to form a pressure balance structure. Therefore, when the pressure of the second fluid input by the inlet part 3 increases, it will not generate more and more fluid resistance to cause the first valve plate to be unable to open, so that the injection valve can be injected under any inlet and outlet pressure difference, and the injection flow rate is increased under the condition of limited injection valve volume. At the same time, it avoids the failure of the injection valve to open abnormally when the back pressure of the outlet is large, and the structure is compact. In addition, the second fluid will not enter the first chamber, so as to prevent the second fluid burning as fuel from being corrosive and corroding the first chamber, thereby improving the reliability of the injection valve and extending its service life. It is particularly suitable for injection valves used as ammonia fuels. On the basis of achieving precise injection, it can also prevent the corrosion of ammonia gas, and has good reliability and service life.

[0056] refer to Figure 2 As shown, in some embodiments, the specific structure of the driving part 1 may include a driving member 11, a driven member 12, a reset assembly 7 and a sealing member 8. The driving member 11 and the driven member 12 are separated in the axial direction to form a first chamber 101, and the driven member 12 is fixedly connected to the first valve plate 5. The reset assembly 7 includes a support 71 and a reset member 72, and the reset member 72 has a pre-tightening force. One end of the reset member 72 is embedded in the support 71, and the other end of the reset member 72 abuts against the first valve plate 5 to press the first valve plate 5 against the second valve plate 6. The support 71 and the driven member 12 form a second chamber 102. The sealing member 8 is fixedly connected to the driven member 12 to isolate the first chamber 101 from the second chamber 102. According to the first pressure generated by the first fluid introduced into the first chamber by the introduction part, the second pressure generated by the second fluid input into the second chamber by the inlet part, and the pressure generated by the fluid at the outlet part, the area of ​​the fluid acting on the follower, the first valve plate, and the second valve plate is matched, so that the pressure on the lower side of the follower is higher than that on the upper side, and the upward fluid force is generated to balance the downward fluid force generated on both sides of the first valve plate, that is, the force of the first pressure P1 acting on the follower 12 is balanced with the force of the pressure P at the outlet part on the first valve plate 5, and the force of the second pressure P2 acting on the follower 12 is balanced with the force acting on the first valve plate 5. The injection valve can be injected at any inlet under any inlet and outlet pressure difference, the injection flow rate is increased under the condition of limited injection valve volume, and the injection valve is prevented from opening abnormally due to large back pressure at the outlet part, ensuring that the sealing of the first valve plate and the second valve plate is only related to the preload force of the reset part, which is conducive to ensuring the controllable sealing conditions. At the same time, the first chamber is sealed to introduce the first fluid, and the second fluid as fuel will not be mixed, so as to avoid the second fluid being corrosive and corroding the driving part, thereby improving the reliability of the injection valve and extending its service life.

[0057] refer to Figure 2 As shown, in some embodiments, the specific structure of the driving part 1 can be that the driving member 11 includes an electromagnet 11', and the driven member 12 includes an armature 12'. The "electromagnet 11'" is preferably a snap-on electromagnet, which has the characteristics of large electromagnetic force and fast response, so as to achieve a fast response of the injection valve. The reset member 72 includes an elastic member 72', the support 71 has a second hole 711, and the elastic member 72' is arranged in the second hole 711. Specifically, Figure 2In the illustrated embodiment, the elastic member 72' includes four multi-turn springs, which are respectively placed in four second holes 711. The support 71 and the first valve plate 5 are guided by the multi-turn springs, replacing the guide structure to avoid guide wear. The sealing member 8 includes a dynamic sealing ring 8', the outer ring side 81 of the dynamic sealing ring 8' is fixedly connected to the support 71, and the inner ring side 82 of the dynamic sealing ring 8' is fixedly connected to the armature 12'. The "dynamic sealing ring 8'" here can ensure that the first chamber 101 formed by the armature 12' and the electromagnet 11' will not leak into the second chamber 102 and the first flow channel 501 during the movement of the armature 12', and ensure that the upward fluid force generated on the upper and lower sides of the armature 12' is balanced with the downward fluid force generated on both sides of the first valve plate 5, so as to achieve a large injection flow rate of the injection valve and smooth injection under any inlet and outlet pressure difference.

[0058] In some embodiments, Figure 2 As shown, the driving part 1 also includes a magnetic isolation ring 13, one end of which abuts against the electromagnet 11', and the other end abuts against the support 71, axially separating the electromagnet 11' and the armature 12' to form a first chamber 101, and the magnetic isolation ring 13 defines a first hole 131, and the first hole 131 is fluidically connected to the introduction part 2. The meaning of "magnetic isolation ring 13" refers to a component made of a material that can isolate magnetism, isolating the electromagnet from the components located below it, preventing the electromagnet from colliding with the armature 12' below after being energized, providing better support for the electromagnet, making the structure more solid and stable, and at the same time preventing the electromagnet magnetic circuit from leaking out and reducing efficiency.

[0059] In some embodiments, Figure 2 As shown, the outer ring side 81 of the dynamic sealing ring 8' is pressed against the abutment between the magnetic isolation ring 13' and the support 71, and the inner ring side 82 of the dynamic sealing ring 8' is pressed against the lower surface of the armature 12' through the fixing sleeve 83. The armature 12' includes an armature disk 121 and a column 122. The first valve plate 5 is fixedly connected to the column 122 by screws 51. The fixing sleeve 83 is sleeved on the column 122. One end of the fixing sleeve 83 abuts against the lower surface of the armature disk 121, and the other end abuts against the first valve plate 5. The fixing sleeve 83 isolates the armature 12' from the second fluid in the second chamber 102, prevents the armature 12' from being corroded by the second fluid, ensures the reliability of the injector, and prolongs the service life. In other embodiments, the inner ring side 82 of the dynamic sealing ring 8' can be fixed to the armature disk 121 by a flange, or can be fixed by welding, but is not limited thereto.

[0060] refer to Figure 2 As shown, in some embodiments, the specific structure of the injection valve 100 may include a first state, a second state, and a third state:

[0061] In the first state, the first valve plate 5 is pressed against the second valve plate 6, the introduction part 2 fills the first chamber 101 with the first fluid, the inlet part 3 fills the second chamber 102 with the second fluid, and the first pressure P1, the second pressure P2 and the pressure P of the outlet are balanced. Specifically, at this time, the injection valve 100 is in a ready state, the first valve plate 5 is pressed by a multi-turn spring and sealed with the second valve plate 6, the injection valve 100 is not opened to spray the second fluid, the first fluid in the first chamber 101 generates a first pressure P1, the second fluid in the second chamber 102 generates a second pressure P2, and the fluid in the outlet 4 generates a pressure P, forming a pressure balance structure, so that the upper and lower sides of the armature disk 121 of the armature 12' generate upward fluid forces to balance the downward fluid forces generated by the upper and lower sides of the first valve plate 5.

[0062] In the second state, the driving part 1 drives the first valve plate 5 to move upward in the axial direction, so that the first flow channel 501 is connected with the second flow channel 601, and the inlet part 3 delivers the second fluid to the outlet part 4. Specifically, at this time, the injection valve 100 is working, the electromagnet 11' is energized, and the armature 12' is attracted to drive the first valve plate 5 to move upward to overcome the elastic force of the multi-turn spring, the first flow channel 501 is connected with the second flow channel 601, the second fluid flows from the inlet part 3 to the outlet part 4, and the second fluid is ejected from the outlet part 4.

[0063] In the third state, the driving part 1 stops working, and the first valve plate 5 is pressed against the second valve plate 6 again, so that the connection between the first flow channel 501 and the second flow channel 601 is disconnected. Specifically, at this time, the injection valve 100 stops spraying, the electromagnet 11' stops being energized, and the first valve plate 5 is reset under the elastic force of the multi-turn spring, and is pressed against the second valve plate 6 again, disconnecting the connection between the first flow channel 501 and the second flow channel 601, and the second fluid sprayed from the outlet 4 is mixed with the air and burned, and the introduction part 2 continues to fill the first chamber 101 with the first fluid, and the inlet part 3 continues to fill the second chamber 102 with the second fluid, so as to avoid the back pressure of the outlet being too large, which causes the first valve plate 5 to be lifted up, and the injection valve 100 to be abnormally opened.

[0064] refer to Figure 2 As shown, in some embodiments, the specific structure of the first valve plate 5 and the second valve plate 6 can be that the first flow channel 501 and the second flow channel 601 are multi-circle annular belts. Specifically, the "multi-circle annular belt" means that a plurality of annular grooves with different radii are arranged at intervals on the valve plate to form a flow channel, and the plurality of annular grooves are concentrically arranged to form a plurality of concentric rings, so as to achieve uniform injection of a large flow rate, such as Figure 3As shown, the first valve plate 5 includes a concentric circle structure with alternating planes and grooves, i.e., multiple rings. The second valve plate 6 is similar in structure to the first valve plate 5, but the plane of the second valve plate 6 can cover the groove of the first valve plate 5, and the plane of the first valve plate 5 can cover the groove of the second valve plate 6, which are alternately distributed, thereby ensuring that the two valve plates can be sealed by fitting the planes together when they are installed relative to each other. The non-ring surface 502 on the valve plate is also provided with holes and grooves to enhance the fluid flow capacity and reduce the flow resistance

[0065] refer to Figure 2 As shown, in some embodiments, the specific structure of the injection valve 100 can be that the first fluid is a non-corrosive gas to ensure that the first chamber 101 is not corroded, especially to ensure that the driving member 11 is not corroded, thereby improving the reliability of the injection valve 100. In some embodiments, the first fluid is air, and the second fluid is ammonia. The electromagnet 11' is injection-molded and potted with ammonia-resistant materials, and the parts in contact with ammonia are made of corrosion-resistant materials to ensure that they are not corroded by ammonia. At the same time, the interface in contact with ammonia, including the inlet 3 and the outlet 4 that are in contact with the outside world, are provided with a leakage collection ring groove 10 for collecting and isolating ammonia when it leaks accidentally. Specifically, as Figure 2 In the illustrated embodiment, the leakage collection annular groove 10 is located between two O-rings 92, and the inner and outer annular grooves are connected via openings to enhance the sealing effect and prevent leakage.

[0066] refer to Figure 2 As shown, in some embodiments, the specific structure of the injection valve 100 may be that it also includes a housing 9, and the interior of the housing 9 provides a accommodating space 91 to accommodate the driving part 1, the first valve plate 5 and the second valve plate 6. The accommodating space 91 has a shoulder 911, and the second valve plate 6 has a lug 61, and the lug 61 abuts against the shoulder 911 to fix the second valve plate 6. The introduction part 2 and the inlet part 3 are opened on the side wall 901 of the housing 9, and the introduction part 2 is directly connected to the first chamber 101, that is, the introduction part 2 does not need to open a flow channel on other parts to introduce the first fluid, and the introduction part 2 is adjacent to the first chamber 101 and can be directly introduced into the first chamber 101, and the outlet part 4 is located on the downstream side of the second valve plate 6. Through the cooperation of the shoulder and the lug, the driving part, the first valve plate and the second valve plate are fixed and supported. The structure is compact and easy to disassemble and assemble.

[0067] refer to Figure 2 As shown, in one embodiment, the specific structure of the engine may include an intake passage (not shown) and the injection valve 100 as described above, wherein the outlet portion 4 of the injection valve 100 is fluidically connected to the intake passage to inject the second fluid into the intake passage, thereby achieving high-flow injection of the injection valve, high response, low friction and wear, resistance to ammonia corrosion, and compact structure.

[0068] In some embodiments, to ensure reliability and injection consistency, the injection valve 100 is used under fluid injection pressure conditions not exceeding 10 bar, but is not limited thereto, and injection can be performed under any inlet and outlet pressure difference within a short period of time.

[0069] refer to Figure 2 As shown, in some embodiments, the engine further includes a supercharged intake manifold (not shown in the figure), and the introduction portion 2 of the injection valve 100 is fluidically connected to the supercharged intake manifold to introduce the first fluid into the first chamber 101 of the injection valve 100. Considering that the first pressure P1 is the same as the pressure P at the outlet, the force can be completely balanced by adjusting the pressure area, and the first fluid introduced from the intake manifold is basically the same as the outlet pressure located in the intake duct. Such a simple structure does not require an additional non-corrosive fluid introduction system, thereby reducing the design and manufacturing costs. It can be understood that this embodiment is only a preferred embodiment of the first fluid introduction method, and the first fluid can also come from other non-corrosive fluids with the same outlet pressure as the introduction system.

[0070] refer to Figure 2 As shown, in one embodiment, the specific steps of the pressure balancing method of the injection valve 100 may include: the introduction part 2 introduces the first fluid into the first chamber 101 of the driving part 1 to generate the first pressure P1. The inlet part 3 introduces the second fluid into the second chamber 102 of the driving part 1 to generate the second pressure P2, and the inlet part 3 also transports the second fluid to the outlet part 4 through the connection between the first flow channel 501 and the second flow channel 601. Among them, the first pressure P1, the second pressure P2 and the pressure P of the outlet part 4 are balanced. The pressure balance is formed, so that the injection valve can be sprayed under any inlet and outlet pressure difference, and the injection flow rate is increased under the condition of limited injection valve volume. At the same time, the failure of the injection valve opening abnormally when the back pressure of the outlet is large is avoided.

[0071] Although the present invention is disclosed as above in terms of preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art may make possible changes and modifications without departing from the spirit and scope of the present invention. Therefore, any modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention without departing from the content of the technical solution of the present invention shall fall within the scope of protection defined by the claims of the present invention.

Claims

1. An injection valve, It is characterized in that include: The driving part includes a first chamber and a second chamber, wherein the first chamber is located above the second chamber and is isolated from each other; an introduction portion, fluidically connected to the first chamber, to introduce a first fluid to generate a first pressure; an inlet portion, fluidly connected to the second chamber so as to allow a second fluid to flow in and generate a second pressure; an outlet portion capable of being fluidly connected to the inlet portion to discharge the second fluid; a first valve plate including a first flow passage in fluid communication with the inlet portion; a second valve plate including a second flow passage fluidly connected to the outlet portion; Among them, the first valve plate is fixedly connected to the driving part, and the driving part drives the first valve plate to move axially relative to the second valve plate, controlling the on-off connection between the first flow channel and the second flow channel to allow or block the second fluid from the inlet to the outlet; the first pressure, the second pressure and the pressure of the outlet are balanced.

2. The injection valve according to claim 1, It is characterized in that The driving unit comprises: A driving member and a driven member, wherein the driving member and the driven member are separated in the axial direction to form the first chamber, and the driven member is fixedly connected to the first valve plate; A reset assembly, comprising a support and a reset member, wherein the reset member has a pre-tightening force, one end of the reset member is embedded in the support, and the other end of the reset member abuts against the first valve plate to press the first valve plate against the second valve plate, and the support and the follower form the second chamber; A sealing member is fixedly connected to the driven member to isolate the first chamber from the second chamber.

3. The injection valve according to claim 2, It is characterized in that The driving member includes an electromagnet, and the driven member includes an armature; the reset member includes an elastic member, the support has a second hole, and the elastic member is arranged in the second hole; the sealing member includes a dynamic sealing ring, the outer ring side of the dynamic sealing ring is fixedly connected to the support, and the inner ring side of the dynamic sealing ring is fixedly connected to the armature.

4. The injection valve according to claim 1, It is characterized in that The injection valve includes a first state, a second state, and a third state: In the first state, the first valve plate is pressed against the second valve plate, the first chamber is filled with the first fluid by the introduction part, the second chamber is filled with the second fluid by the inlet part, and the first pressure, the second pressure and the pressure of the outlet part are balanced; In the second state, the driving part drives the first valve plate to move upward in the axial direction, so that the first flow channel is connected with the second flow channel, and the inlet part transports the second fluid to the outlet part; In the third state, the driving unit stops working, and the first valve plate is pressed against the second valve plate again, so that the connection between the first flow channel and the second flow channel is disconnected.

5. The injection valve according to claim 1, It is characterized in that The first flow channel and the second flow channel are multi-circle annular belts.

6. The injection valve according to claim 1, It is characterized in that The first fluid is a non-corrosive gas.

7. The injection valve according to claim 1, It is characterized in that The injection valve also includes a shell, the interior of the shell provides a accommodating space to accommodate the driving part, the first valve plate and the second valve plate; the accommodating space has a shoulder, and the second valve plate has a lug, and the lug abuts against the shoulder to fix the second valve plate; the introduction part and the inlet part are opened on the side wall of the shell, the introduction part is directly connected to the first chamber, and the outlet part is located on the downstream side of the second valve plate.

8. An engine, It is characterized in that The invention comprises an intake passage and an injection valve as claimed in any one of claims 1 to 7, wherein an outlet portion of the injection valve is fluidically connected to the intake passage so as to inject a second fluid into the intake passage.

9. The engine as claimed in claim 8, It is characterized in that The engine further includes a post-supercharging intake manifold, and an introduction portion of the injection valve is fluidly connected to the post-supercharging intake manifold to introduce a first fluid into a first chamber of the injection valve.

10. A pressure balancing method for an injection valve, It is characterized in that Using the injection valve according to any one of claims 1 to 7, the balancing method comprises: The introduction part introduces a first fluid into the first chamber of the driving part to generate a first pressure; The inlet portion introduces a second fluid into the second chamber of the driving portion to generate a second pressure, and the inlet portion also delivers the second fluid to the outlet portion through the connection between the first flow channel and the second flow channel; The first pressure, the second pressure and the pressure of the outlet are balanced.

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