A methanol injector and engine

Abstract

This invention provides a methanol injector and an engine. The methanol injector includes: an injector body with a working chamber and a methanol inlet; a valve sleeve body located in the working chamber and connected to the injector body; a throttle plate located in the working chamber and connected to the valve sleeve body; a pressure-reducing chamber formed between the throttle plate and the valve sleeve body; the pressure-reducing chamber communicating with the methanol discharge channel of the throttle plate; a conical groove cooperating with a sealing ball at the end of the throttle plate away from the valve sleeve body; a first methanol inlet channel provided in the valve sleeve body; a needle valve located in the working chamber and connected to the end of the valve sleeve body away from the throttle plate; a control chamber formed between the needle valve and the valve sleeve body; the control chamber communicating with the pressure-reducing chamber; and a first methanol inlet channel provided in the valve sleeve body, one end of which communicates with the working chamber, and the other end of which communicates with the control chamber. This solution solves the technical problem in the prior art where methanol vaporization easily causes erosion and scouring of the conical groove of the throttle plate.

Description

Technical Field

[0001] This invention relates to the technical field of engine fuel supply, and more specifically, to a methanol injector and an engine. Background Technology

[0002] Methanol fuel has advantages such as high oxygen content, clean combustion, and low carbon and pollutant emissions, which can effectively alleviate dependence on oil and improve energy security. It has been rapidly promoted in the fields of ships, heavy vehicles and internal combustion engines.

[0003] In an electronically controlled methanol injector, the control valve is responsible for regulating the control chamber pressure when the needle valve opens and closes. Its core components include the valve sleeve, the throttling plate, and the sealing ball. After the control valve opens, the high-pressure methanol in the control chamber will flow back and depressurize through the narrow channel of the throttling plate to initiate the injection process. During the operation of the injector, high-pressure methanol enters the control chamber from the inlet and is then depressurized through the narrow channel of the throttling plate to ensure the normal operation of the injection process. During the depressurization process, the methanol pressure drops sharply. When the local pressure is lower than the saturated vapor pressure of methanol at that temperature, methanol is prone to vaporization, forming a large number of bubbles. These bubbles collapse rapidly when they flow with the fluid to the conical groove of the throttling plate, generating extremely high instantaneous impact pressure and microjet. This cavitation or cavitation phenomenon will cause severe material erosion on the conical groove of the throttling plate, leading to increased surface roughness and changes in geometry, which in turn can cause problems such as sealing failure, unstable control chamber pressure, delayed needle valve response, and even injector leakage.

[0004] There is currently no good solution to the technical problem that methanol vaporization can easily cause erosion of the conical grooves of the throttling plate. Summary of the Invention

[0005] The main objective of this invention is to provide a methanol injector and engine to solve the technical problem in the prior art that methanol vaporization easily causes erosion and scouring of the conical groove of the throttle plate.

[0006] To achieve the above objectives, according to one aspect of the present invention, a methanol injector is provided, comprising: an injector body having a working chamber and an inlet for methanol, the inlet communicating with the working chamber, the working chamber extending axially along the injector body; a valve sleeve assembly having a valve sleeve body and a throttling plate, the valve sleeve body being disposed in the working chamber and connected to the injector body, the throttling plate being disposed in the working chamber and connected to the valve sleeve body, a pressure reducing chamber being formed between the throttling plate and the valve sleeve body, the pressure reducing chamber communicating with an methanol discharge channel of the throttling plate, a conical groove cooperating with a sealing ball being provided at one end of the throttling plate away from the valve sleeve body, the valve sleeve body having a first methanol inlet channel; and a valve body assembly having a needle valve having a needle valve being disposed in the working chamber and connected to the end of the valve sleeve body away from the throttling plate, a control chamber being formed between the needle valve and the valve sleeve body, the control chamber communicating with the pressure reducing chamber; wherein the valve sleeve body has a first methanol inlet channel, one end of the first methanol inlet channel communicating with the working chamber, and the other end of the first methanol inlet channel communicating with the control chamber.

[0007] Furthermore, the throttle plate is made of silicon carbide ceramic material.

[0008] Furthermore, the throttle plate and the valve sleeve body are configured with a difference in hardness.

[0009] Furthermore, the valve sleeve body is also provided with a second alcohol inlet channel, one end of which is connected to the working chamber and the other end of which is connected to the pressure reducing chamber.

[0010] Furthermore, the valve body assembly also includes: a valve housing, which is connected to one end of the injector body away from the valve sleeve assembly, and communicates with the working chamber; the valve housing is provided with an injection port at the end away from the injector body; a valve core, which is located inside the valve housing, with one end of the valve core connected to the injector body, and the other end of the valve core provided with a through hole communicating with the injection port; and a needle valve located inside the valve core, which has a first position for blocking the injection port and a second position for avoiding the injection port.

[0011] Furthermore, the valve core is made of silicon carbide ceramic material.

[0012] Furthermore, the valve body assembly also includes: an elastic element disposed within the working chamber, one end of which is connected to the needle valve, and the other end of which is connected to the injector body, the elastic element providing a pre-tightening force to seal the injection port of the needle valve.

[0013] Furthermore, the inner wall of the valve body is provided with a limiting shoulder A, which extends circumferentially along the valve body. The valve core is provided with a limiting shoulder B, and an adjustment space is formed between the limiting shoulder A and the limiting shoulder B. A sealing gasket is provided in the adjustment space. One end of the sealing gasket abuts against the limiting shoulder A, and the other end of the sealing gasket abuts against the limiting shoulder B. The outer ring of the sealing gasket is fitted to the inner wall of the valve body.

[0014] Furthermore, the methanol injector also includes: a solenoid valve, which is connected to one end of the injector body near the valve sleeve assembly, the armature of the solenoid valve having a working position separated from the sealing ball and a closed position with the sealing ball abutting.

[0015] According to another aspect of the present invention, an engine is provided, the engine comprising the methanol injector described above.

[0016] In the technical solution of this invention, the valve sleeve body, the throttling plate, and the needle valve are located within the working chamber of the injector body. The valve sleeve body is situated between the throttling plate and the needle valve, forming a pressure-reducing chamber between the throttling plate and the valve sleeve body. A control chamber is formed between the needle valve and the valve sleeve body. The pressure-reducing chamber is connected to the methanol discharge channel of the throttling plate and the control chamber, respectively. Methanol flowing into the methanol discharge channel through the control chamber is first depressurized by the pressure-reducing chamber, reducing the methanol pressure and flow rate within the discharge channel. When methanol acts on the conical groove, the pressure drop of methanol decreases, and the local pressure is less likely to fall below the saturated vapor pressure of methanol, thus reducing the number of bubbles generated at the source. Even if a small number of bubbles are generated, the impact pressure and microjet intensity generated when the bubbles collapse are significantly weakened due to the reduced fluid kinetic energy, insufficient to cause severe erosion of the sealing cone surface of the conical groove. In the above solution, by designing a pressure-reducing chamber to reduce the degree of methanol vaporization and kinetic energy, the technical problem of methanol vaporization easily causing erosion and scouring of the conical groove of the throttling plate in the prior art is solved. Attached Figure Description

[0017] The accompanying drawings, which form part of this application, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an undue limitation of the invention. In the drawings: Figure 1 This is a schematic diagram of the methanol injector in this invention; Figure 2 This is a partial enlargement of the methanol injector in this invention. Figure 1 ; Figure 3 This is a partial enlargement of the methanol injector in this invention. Figure 2 .

[0018] The above figures include the following reference numerals: 10. Injector body; 11. Working chamber; 12. Alcohol inlet; 13. Alcohol return channel; 21. Valve sleeve body; 211. First alcohol inlet channel; 212. Second alcohol inlet channel; 22. Throttling plate; 221. Alcohol removal channel; 222. Conical groove; 23. Sealing ball; 231. Ball seat; 24. Decompression chamber; 25. Control cavity; 31. Needle valve; 311. Snap ring; 312. Pressure regulating shim; 32. Valve body; 321. Injection port; 322. First locking nut; 323. Limiting shoulder A; 324. Limiting shoulder C; 33. Valve core; 331. Limiting shoulder B; 332. Limiting shoulder D; 34. Elastic components; 35. Sealing gasket; 40. Solenoid valve; 41. Second locking nut. Detailed Implementation

[0019] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. The present invention will now be described in detail with reference to the accompanying drawings and embodiments.

[0020] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0021] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such terms can be used interchangeably where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover a non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0022] Exemplary embodiments according to this application will now be described in more detail with reference to the accompanying drawings. However, these exemplary embodiments may be implemented in many different forms and should not be construed as being limited to the embodiments set forth herein. It should be understood that these embodiments are provided so that the disclosure of this application is thorough and complete, and that the concept of these exemplary embodiments is fully conveyed to those skilled in the art. In the drawings, for clarity, the thickness of layers and regions may be exaggerated, and the same reference numerals are used to denote the same devices, and therefore their description will be omitted.

[0023] Methanol fuel has advantages such as high oxygen content, clean combustion, and low carbon and pollutant emissions, which can effectively alleviate dependence on oil and improve energy security. It has been rapidly promoted in the fields of ships, heavy vehicles and internal combustion engines.

[0024] In an electronically controlled methanol injector, the control valve is responsible for regulating the control chamber pressure when the needle valve opens and closes. Its core components include the valve sleeve, the throttling plate, and the sealing ball. After the control valve opens, the high-pressure methanol in the control chamber will flow back and depressurize through the narrow channel of the throttling plate to initiate the injection process. During the operation of the injector, high-pressure methanol enters the control chamber from the inlet and is then depressurized through the narrow channel of the throttling plate to ensure the normal operation of the injection process. During the depressurization process, the methanol pressure drops sharply. When the local pressure is lower than the saturated vapor pressure of methanol at that temperature, methanol is prone to vaporization, forming a large number of bubbles. These bubbles collapse rapidly when they flow with the fluid to the conical groove of the throttling plate, generating extremely high instantaneous impact pressure and microjet. This cavitation or cavitation phenomenon will cause severe material erosion on the conical groove of the throttling plate, leading to increased surface roughness and changes in geometry, which in turn can cause problems such as sealing failure, unstable control chamber pressure, delayed needle valve response, and even injector leakage.

[0025] To address the technical problem that methanol vaporization can easily cause erosion of the conical grooves of the throttling plate in existing technologies, the following solution is proposed.

[0026] Combination Figures 1 to 3 As shown, according to a specific embodiment of this application, a methanol injector is provided.

[0027] Specifically, the methanol injector includes an injector body 10, a valve sleeve assembly, and a valve body assembly. The injector body 10 has a working chamber 11 and an alcohol inlet 12, which communicates with the working chamber 11. The working chamber 11 extends through the injector body 10 along its axial direction. The valve sleeve assembly includes a valve sleeve body 21 and a throttling plate 22. The valve sleeve body 21 is located in the working chamber 11 and connected to the injector body 10. The throttling plate 22 is located in the working chamber 11 and connected to the valve sleeve body 21. A pressure-reducing chamber 24 is formed between the throttling plate 22 and the valve sleeve body 21. The pressure-reducing chamber 24 communicates with the alcohol discharge channel 221 of the throttling plate 22. The end of the throttling plate 22 away from the valve sleeve body 21 has a conical groove 222 that mates with a sealing ball 23. The valve sleeve body 21 has a first alcohol inlet channel 211. The valve body assembly includes a needle valve 31, which is located in the working chamber 11 and connected to the end of the valve sleeve body 21 away from the throttling plate 22. A control chamber 25 is formed between the needle valve 31 and the valve sleeve body 21, and the control chamber 25 is connected to the pressure reducing chamber 24. The valve sleeve body 21 is provided with a first alcohol inlet channel 211, one end of which is connected to the working chamber 11 and the other end of which is connected to the control chamber 25.

[0028] In the embodiments of this application, the valve sleeve body 21, the throttling plate 22, and the needle valve 31 are disposed in the working chamber 11 of the injector body 10. The valve sleeve body 21 is located between the throttling plate 22 and the needle valve 31. A pressure reducing chamber 24 is formed between the throttling plate 22 and the valve sleeve body 21, and a control chamber 25 is formed between the needle valve 31 and the valve sleeve body 21. The pressure reducing chamber 24 is connected to the methanol discharge channel 221 of the throttling plate 22 and the control chamber 25, respectively. Methanol flowing into the methanol discharge channel 221 through the control chamber 25 is first depressurized by the pressure reducing chamber 24 to reduce the methanol pressure and flow rate in the methanol discharge channel 221. When methanol acts on the conical groove 222, the pressure drop of methanol is reduced, and the local pressure is not easy to be lower than the saturated vapor pressure of methanol, thereby reducing the number of bubbles generated from the source. Even if a small number of bubbles are generated, since the fluid kinetic energy has been reduced, the impact pressure and microjet intensity generated when the bubbles collapse are also greatly weakened, which is insufficient to cause serious erosion of the sealing cone surface of the conical groove 222. In the above solution, the vaporization degree and kinetic energy of methanol are reduced by designing the pressure reducing chamber 24, thereby solving the technical problem in the prior art that methanol vaporization easily causes erosion and scouring of the conical groove 222 of the throttling plate 22.

[0029] In one exemplary embodiment of this application, such as Figure 1 , Figure 2As shown, the injector body 10 has a working chamber 11, which extends through the axial direction of the injector body 10. An extension is provided on the outer wall of the injector body 10, extending radially. The extension has an alcohol inlet 12 communicating with the working chamber 11. A first mounting step is formed at one end of the working chamber 11. The valve sleeve body 21 has a T-shaped structure, extending into the working chamber 11 and abutting against the first mounting step. An mounting groove is provided at the end of the valve sleeve body 21 near the needle valve 31, extending axially. One end of the needle valve 31 extends into the mounting groove and is sealed against the groove wall by a sealing ring. A control chamber 25 is formed between the needle valve 31 and the valve sleeve body 21. The valve sleeve body 21 has a first alcohol inlet channel 211, which communicates with the control chamber 25. A throttling plate 22 is disposed in the working chamber 11 and connected to the end of the valve sleeve body 21 away from the needle valve 31. The throttling plate 22 and the valve sleeve body 21 are connected by a pin. A groove is provided at the end of the valve sleeve body 21 near the throttling plate 22, and the groove and the throttling plate 22 surround to form a pressure reducing chamber 24. The valve sleeve body 21 is provided with a connecting channel that extends axially along the valve sleeve body 21, and the control chamber 25 communicates with the pressure reducing chamber 24 through the connecting channel. The throttling plate 22 is provided with an alcohol discharge channel 221 that extends axially along the throttling plate 22 and communicates with the pressure reducing chamber 24. A conical groove 222 is provided at the end of the throttling plate 22 away from the valve sleeve body 21. The conical groove 222 has a sealing conical surface that mates with the sealing ball 23. A ball seat 231 is provided at the end of the sealing ball 23 away from the sealing conical surface. The sealing cone surface of the conical groove 222 is provided with a reflux port, and the injector body 10 is provided with an axially extending alcohol return channel 13, which is connected to the alcohol return channel 13.

[0030] The sealing ball 23 is driven by a drive member, which has a closed state that abuts against the ball seat 231, and an operating state that is separated from the ball seat 231.

[0031] Furthermore, the throttle plate 22 is made of silicon carbide ceramic material.

[0032] It should be noted that methanol is highly susceptible to vaporization during high-pressure throttling. The collapse of the resulting bubbles causes not only physical mechanical erosion (cavitation) but also chemical corrosion. Traditional metals or ordinary alloys, under the combined effects of mechanical impact and chemical corrosion over a long period, are prone to rapid wear and roughening of the conical groove 222, ultimately leading to seal failure. If the conical groove 222 becomes rough or changes shape due to corrosion or wear, it will increase the leakage of the control chamber 25, thereby causing delayed closing of the needle valve 31, delayed injection, or dripping.

[0033] In the embodiments of this application, the throttling plate 22 is made of silicon carbide ceramic material. Silicon carbide ceramic material has extremely high chemical stability, strong corrosion resistance to methanol medium, and extremely high hardness. Using silicon carbide ceramic material to manufacture the throttling plate 22 can fundamentally resist the impact and chemical corrosion of the micro-jet generated by methanol vaporization, ensuring that the conical groove 222 maintains a smooth and dense surface state during long-term high-frequency spraying operation, thereby solving the problem of short sealing life of the throttling plate 22 due to corrosion and wear.

[0034] Furthermore, the throttle plate 22 and the valve sleeve body 21 are configured with a difference in hardness.

[0035] It should be noted that, under the high-pressure operating environment of the methanol injector, the contact surface between the throttle plate 22 and the valve sleeve body 21 is one of the key sealing interfaces. If the throttle plate 22 and the valve sleeve body 21 have the same hardness and are both made of hard materials, unevenness on the contact surface under high pressure will make it difficult to fit completely, easily forming a leakage channel. This will cause high-pressure methanol to leak from the end face to an unexpected area, affecting the accuracy of pressure control.

[0036] In the embodiments of this application, the throttle plate 22 and the valve sleeve body 21 are provided with a difference in hardness. Under the action of axial clamping force, the softer material surface will undergo slight elastic or plastic deformation, filling the microscopic gaps on the harder material surface, achieving a tighter and more reliable end face seal under high pressure conditions, and ensuring the airtightness of the methanol flow channel.

[0037] For example, the throttle plate 22 is made of silicon carbide ceramic, and the valve sleeve body 21 is made of martensitic stainless steel or austenitic stainless steel.

[0038] Furthermore, the valve sleeve body 21 is also provided with a second alcohol inlet channel 212, one end of which is connected to the working chamber 11, and the other end of which is connected to the pressure reducing chamber 24.

[0039] It should be noted that after the solenoid valve 40 of the methanol injector is de-energized, the sealing ball 23 cuts off the pressure relief path, and the high-pressure methanol enters the control chamber 25 through the first methanol inlet channel 211. The pressure in the control chamber 25 rises to and exceeds the pressure in the working chamber 11, driving the needle valve 31 to sit (move to close the injection port 321).

[0040] In the embodiments of this application, the provision of the second methanol inlet channel 212 increases the methanol inlet flow rate per unit time, shortens the pressure build-up time in the control chamber 25, and shortens the response delay time of the needle valve 31, ensuring that the needle valve 31 can quickly seat and avoiding injection lag or dripping. The second methanol inlet channel 212 is connected to the pressure reducing chamber 24, which can reduce the pressure of high-pressure methanol, reduce pressure fluctuations entering the control chamber 25, make the pressure in the control chamber 25 more stable, and avoid rebound when the needle valve 31 seats.

[0041] Furthermore, the valve body assembly also includes a valve housing 32 and a valve core 33. The valve housing 32 is connected to the end of the injector body 10 away from the valve sleeve assembly, and the valve housing 32 communicates with the working chamber 11. The end of the valve housing 32 away from the injector body 10 is provided with an injection port 321. The valve core 33 is disposed inside the valve housing 32, with one end of the valve core 33 connected to the injector body 10, and the other end of the valve core 33 provided with a through hole communicating with the injection port 321. A needle valve 31 is disposed inside the valve core 33, and the needle valve 31 has a first position for blocking the injection port 321 and a second position for avoiding the injection port 321.

[0042] It should be noted that the needle valve 31 is located inside the valve core 33, and a methanol passage space is formed between the needle valve 31 and the valve core 33, that is, the valve core 33 is in direct contact with methanol.

[0043] In the embodiments of this application, the valve housing 32 and the valve core 33 are designed separately. The valve housing 32 and the valve core 33 can be made of different materials. The valve core 33, which is in direct contact with methanol, is made of corrosion-resistant material to avoid the valve core 33 from affecting the sealing performance of the methanol injector due to corrosion and to improve the reliability of the methanol injector.

[0044] like Figure 3 As shown, the valve housing 32 is screwed to the injector body 10 via a first locking nut 322. The first locking nut 322 has a first annular protrusion. The valve housing 32 is located within the first locking nut 322 and abuts against the end face of the first annular protrusion. The first locking nut 322 and the injector body 10 together form a first mounting cavity for accommodating the valve housing 32. The end face of the valve housing 32 abuts against the end face of the injector body 10. The valve core 33 is located within the valve housing 32. The valve core 33 abuts against a limiting shoulder C324 within the valve housing 32 via a limiting shoulder D332. The end face of the valve core 33 is flush with the end face of the valve housing 32 and abuts against the end face of the injector body 10. An injection port 321 is located at the end of the valve housing 32 furthest from the injector body 10, and the valve core 33 has a through hole communicating with the injection port 321. The needle valve 31 is located inside the valve core 33 and is slidably connected to the valve core 33. The needle valve 31 has a first position that blocks the injection port 321 and a second position that avoids the injection port 321.

[0045] Preferably, the valve core 33 is made of silicon carbide ceramic material.

[0046] Furthermore, the valve body assembly also includes: an elastic element 34, which is disposed in the working chamber 11. One end of the elastic element 34 is connected to the needle valve, and the other end of the elastic element 34 is connected to the injector body 10. The elastic element 34 provides a pre-tightening force to block the injection port 321 of the needle valve 31.

[0047] In the embodiments of this application, when the injector is in the closed state, the elastic force of the elastic element 34 and the pressure of the control chamber 25 work together to block the injection port 321 of the needle valve 31, thereby improving the speed and reliability of the needle valve 31 settling.

[0048] like Figure 1 As shown, the working chamber 11 of the injector body 10 is provided with a second mounting step. An annular groove is provided on the outer wall of the needle valve 31. A retaining ring 311 is fitted into the annular groove. A pressure adjusting pad 312 is connected to one end of the retaining ring 311 near the second mounting step. An elastic element 34 is located within the working chamber 11. One end of the elastic element 34 is connected to the second mounting step, and the other end is connected to the pressure adjusting pad 312. The elasticity of the elastic element 34 is adjusted by replacing pressure adjusting pads 312 of different thicknesses. The elastic element 34 is a spring, and it is fitted onto the outer wall of the needle valve 31.

[0049] Furthermore, the inner wall of the valve housing 32 is provided with a limiting shoulder A323, which extends circumferentially along the valve housing 32. The valve core 33 is provided with a limiting shoulder B331. An adjustment space is formed between the limiting shoulder A323 and the limiting shoulder B331. A sealing gasket 35 is provided in the adjustment space. One end of the sealing gasket 35 abuts against the limiting shoulder A323, and the other end of the sealing gasket 35 abuts against the limiting shoulder B331. The outer ring of the sealing gasket 35 is fitted to the inner wall of the valve housing 32.

[0050] In the embodiments of this application, the valve housing 32 is sealed and abutted against the valve core 33 in the axial direction by a sealing gasket 35. The sealing gasket 35 not only plays a sealing role, but also can make the end face of the valve housing 32 flush with the end face of the valve core 33 by adjusting the thickness of the sealing gasket 35, thereby sealing and abutting against the end face of the injector body 10.

[0051] Furthermore, the methanol injector also includes a solenoid valve 40, which is connected to one end of the injector body 10 near the valve sleeve assembly. The armature of the solenoid valve 40 has a working position separated from the sealing ball 23 and a closed position with the sealing ball 23 abutting against it.

[0052] like Figure 1As shown, the solenoid valve 40 is screwed to the injector body 10 via a second locking nut 41. The solenoid valve 40 is located on a third mounting step that mates with the second locking nut 41, and on a fourth mounting step that abuts against the end face of the injector body 10. The second locking nut 41 and the injector body 10 together form a second mounting cavity for the solenoid valve 40. The solenoid valve 40 is fitted to a ball seat 231 via an armature, and the sealing ball 23 is connected to the ball seat 231. When the solenoid valve 40 is energized, the armature separates from the ball seat 231 to open the pressure relief channel, meaning that the control chamber 25 can be depressurized through the alcohol discharge channel 221 on the throttling plate 22. When the solenoid valve 40 is de-energized, the armature abuts against the ball seat 231 to disconnect the pressure relief channel.

[0053] The methanol injector's inlet 12 is connected to the high-pressure methanol inlet pipe. The methanol injector's operation process is as follows: When the solenoid valve 40 is not energized, the sealing ball 23 is tightly fitted with the sealing cone surface of the throttle plate 22, the methanol discharge channel 221 of the throttle plate 22 is in the open state, and the needle valve 31 blocks the injection port 321 under the pressure of the control chamber 25 and the elasticity of the elastic element 34, effectively blocking the flow of methanol medium.

[0054] After the solenoid valve 40 is energized, it generates an electromagnetic force that overcomes the preload of the electromagnet spring. The armature of the solenoid valve 40 moves away from the ball seat 231 of the sealing ball 23, and the methanol discharge channel 221 of the throttle plate 22 is in a connected state. The methanol in the control chamber 25 flows through the methanol discharge channel 221 to the methanol return channel 13, and the pressure in the control chamber 25 decreases. The pressure in the working chamber 11 is greater than the pressure in the control chamber 25. The needle valve 31 overcomes the elastic force of the elastic element 34 and is driven to move towards the valve sleeve body 21 to avoid the injection port 321. The high-pressure methanol is sprayed out in the form of atomization.

[0055] After the solenoid valve 40 is energized, the sealing ball is tightly fitted with the sealing cone surface of the throttle plate 22, and the methanol discharge channel 221 of the throttle plate 22 is in the open state. High-pressure methanol enters the control chamber 25 through the first methanol inlet channel 211 and the second methanol inlet channel 212. The pressure in the control chamber 25 rises, and the pressure in the control chamber 25 is greater than the pressure in the working chamber 11. Together with the restoring force of the elastic element 34, it drives the needle valve 31 to move away from the valve sleeve body 21 to block the injection port 321.

[0056] According to another specific embodiment of this application, an engine is provided, which includes the methanol injector described in the above embodiment.

[0057] Specifically, the engine includes a methanol injector, which comprises an injector body 10, a valve sleeve assembly, and a valve body assembly. The injector body 10 has a working chamber 11 and a methanol inlet 12, which communicates with the working chamber 11. The working chamber 11 extends through the injector body 10 along its axial direction. The valve sleeve assembly includes a valve sleeve body 21 and a throttle plate 22. The valve sleeve body 21 is located in the working chamber 11 and connected to the injector body 10. The throttle plate 22 is located in the working chamber 11 and connected to the valve sleeve body 21. A pressure-reducing chamber 24 is formed between the throttle plate 22 and the valve sleeve body 21. The pressure-reducing chamber 24 communicates with the methanol discharge channel 221 of the throttle plate 22. The end of the throttle plate 22 away from the valve sleeve body 21 has a conical groove 222 that mates with a sealing ball 23. The valve sleeve body 21 has a first methanol inlet channel 211. The valve body assembly includes a needle valve 31, which is located in the working chamber 11 and connected to the end of the valve sleeve body 21 away from the throttling plate 22. A control chamber 25 is formed between the needle valve 31 and the valve sleeve body 21, and the control chamber 25 is connected to the pressure reducing chamber 24. The valve sleeve body 21 is provided with a first methanol inlet channel 211, one end of which is connected to the working chamber 11, and the other end of which is connected to the control chamber 25. Methanol flowing into the methanol discharge channel 221 through the control chamber 25 is first depressurized by the pressure reducing chamber 24, reducing the methanol pressure and flow rate in the methanol discharge channel 221. When methanol acts on the conical groove 222, the pressure drop of methanol is reduced, and the local pressure is less likely to fall below the saturated vapor pressure of methanol, thus reducing the number of bubbles generated at the source. Even if a small number of bubbles are generated, the impact pressure and microjet intensity generated when the bubbles collapse are greatly weakened due to the reduced fluid kinetic energy, which is insufficient to cause severe erosion of the sealing cone surface of the conical groove 222.

[0058] As can be seen from the above description, the embodiments of the present invention achieve the following technical effects: 1. A pressure-reducing chamber 24 is formed between the throttle plate 22 and the valve sleeve body 21. The pressure-reducing chamber 24 is used to release the outlet pressure of high-pressure methanol, which can reduce the cavitation and scouring of the sealing cone surface inside the conical groove 222 of the throttle plate 22 by high-pressure methanol, and improve the reliability of the sealing cone surface.

[0059] 2. The setting of the second alcohol inlet channel 212 increases the alcohol inlet flow rate per unit time, shortens the pressure build-up time in the control chamber 25, shortens the response delay time of the needle valve 31, and ensures that the needle valve 31 can quickly sit down, avoiding jet lag or dripping.

[0060] 3. The second methanol inlet channel 212 is connected to the pressure reducing chamber 24, which can reduce the pressure of high-pressure methanol, reduce the pressure fluctuation entering the control chamber 25, make the pressure in the control chamber 25 more stable, and avoid the rebound when the needle valve 31 is seated.

[0061] 4. The valve body 32 and valve core 33 are designed separately. The valve core 33 is made of silicon carbide ceramic material, and the throttle plate 22 is also made of silicon carbide ceramic material, which solves the problem of short sealing life caused by corrosion and wear of the throttle plate 22 and valve core 33.

[0062] 5. The valve housing 32 is sealed and abutted against the valve core 33 in the axial direction by the sealing gasket 35. The sealing gasket 35 not only plays a sealing role, but also can make the end face of the valve housing 32 flush with the end face of the valve core 33 by adjusting the thickness of the sealing gasket 35, thereby sealing and abutting against the end face of the injector body 10.

[0063] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0064] In addition to the above, it should be noted that the terms "one embodiment," "another embodiment," and "embodiment" used in this specification refer to specific features, structures, or characteristics described in connection with that embodiment, which are included in at least one embodiment described in the general description of this application. The appearance of the same expression in multiple places in the specification does not necessarily refer to the same embodiment. Furthermore, when a specific feature, structure, or characteristic is described in connection with any embodiment, the intention is to suggest that implementing such a feature, structure, or characteristic in conjunction with other embodiments also falls within the scope of this invention.

[0065] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0066] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A methanol injector characterized by, include: The injector body (10) is provided with a working chamber (11) and an alcohol inlet (12). The alcohol inlet (12) is connected to the working chamber (11), and the working chamber (11) is axially connected to the injector body (10). A valve sleeve assembly, comprising a valve sleeve body (21) and a throttle plate (22), wherein the valve sleeve body (21) is disposed in the working chamber (11) and connected to the injector body (10), and the throttle plate (22) is disposed in the working chamber (11) and connected to the valve sleeve body (21), wherein a pressure reducing chamber (24) is formed between the throttle plate (22) and the valve sleeve body (21), and the pressure reducing chamber (24) is connected to the alcohol discharge channel (221) of the throttle plate (22), wherein the end of the throttle plate (22) away from the valve sleeve body (21) is provided with a conical groove (222) that cooperates with a sealing ball (23), and the valve sleeve body (21) is provided with a first alcohol inlet channel (211). A valve body assembly, the valve body assembly including a needle valve (31), the needle valve (31) being disposed in the working chamber (11) and connected to the end of the valve sleeve body (21) away from the throttle plate (22), the needle valve (31) and the valve sleeve body (21) forming a control chamber (25), the control chamber (25) communicating with the pressure reducing chamber (24); The valve sleeve body (21) is provided with a first alcohol inlet channel (211), one end of the first alcohol inlet channel (211) is connected to the working chamber (11), and the other end of the first alcohol inlet channel (211) is connected to the control chamber (25).

2. The methanol injector according to claim 1, characterized in that, The throttling plate (22) is made of silicon carbide ceramic material.

3. The methanol injector of claim 1, wherein The throttle plate (22) and the valve sleeve body (21) are configured with a difference in hardness.

4. The methanol injector of claim 1, wherein The valve sleeve body (21) is also provided with a second alcohol inlet channel (212), one end of which is connected to the working chamber (11), and the other end of which is connected to the pressure reducing chamber (24).

5. The methanol injector according to any one of claims 1 to 4, characterized in that The valve body assembly also includes: Valve housing (32), the valve housing (32) is connected to the end of the injector body (10) away from the valve sleeve assembly, the valve housing (32) is connected to the working chamber (11), and the end of the valve housing (32) away from the injector body (10) is provided with an injection port (321). A valve core (33) is disposed inside the valve housing (32). One end of the valve core (33) is connected to the injector body (10). The other end of the valve core (33) is provided with a through hole communicating with the injection port (321). A needle valve (31) is disposed inside the valve core (33). The needle valve (31) has a first position for blocking the injection port (321) and a second position for avoiding the injection port (321).

6. The methanol injector of claim 5, wherein The valve core (33) is made of silicon carbide ceramic material.

7. The methanol injector of claim 5 wherein, The valve body assembly also includes: An elastic element (34) is disposed in the working chamber (11). One end of the elastic element (34) is connected to the needle valve, and the other end of the elastic element (34) is connected to the injector body (10). The elastic element (34) provides a pre-tightening force to block the injection port (321) of the needle valve (31).

8. The methanol injector of claim 5 wherein, The inner wall of the valve housing (32) is provided with a limiting shoulder A (323), which extends circumferentially along the valve housing (32). The valve core (33) is provided with a limiting shoulder B (331). An adjustment space is formed between the limiting shoulder A (323) and the limiting shoulder B (331). A sealing gasket (35) is provided in the adjustment space. One end of the sealing gasket (35) abuts against the limiting shoulder A (323), and the other end of the sealing gasket (35) abuts against the limiting shoulder B (331). The outer ring of the sealing gasket (35) fits against the inner wall of the valve housing (32).

9. The methanol injector according to any one of claims 1 to 4, characterized in that The methanol injector also includes: A solenoid valve (40) is connected to one end of the injector body (10) near the valve sleeve assembly. The armature of the solenoid valve (40) has a working position separated from the sealing ball (23) and a closed position with the sealing ball (23) abutting.

10. An engine characterized by, The engine includes the methanol injector according to any one of claims 1-9.

Images