Methanol injector control device

Abstract

The utility model relates to a kind of methanol injector control device, involve engine alternative fuel field.The scheme includes oil inlet valve seat, its axial setting is connected with control cavity and oil return throttle hole, its radial setting is connected with oil inlet hole and oil inlet throttle hole, the top of control cavity is connected with oil return throttle hole, the side of control cavity is connected with oil inlet throttle hole;Control valve seat, it is above oil inlet valve seat, its axial setting is connected with buffer cavity and oil return hole, the bottom of buffer cavity is connected with the top of oil return throttle hole;Control valve core, it is above control valve seat, it includes sealing plane and hemispherical surface;Armature rod, it is through taper and hemispherical surface butt joint;The top seat surface of control valve seat is provided with sealing ring belt around oil return hole, pressure relief groove located in the outside of sealing ring belt and low pressure groove located in the outside of pressure relief groove, low pressure groove and pressure relief groove are connected by flow guide groove;Effectively solve the failure problem of traditional methanol injector control valve seat.

Description

Technical Field

[0001] This utility model relates to the field of alternative fuel technology for engines, and in particular to a methanol injector control device. Background Technology

[0002] With the increasing scarcity of fuel resources and growing environmental pollution, reducing dependence on petroleum resources and exploring clean alternative energy sources has become an inevitable trend in global energy transition and industrial development. Methanol, with its advantages of clean combustion and wide availability, demonstrates irreplaceable application value in power sectors such as shipping and road transportation, as well as in the process of energy structure optimization. As a core component of methanol internal combustion engines, the fuel injection system directly determines engine efficiency and emission levels. The injector, as a key actuator in this system, must precisely inject a fixed amount of high-pressure methanol into the combustion chamber, providing a fundamental guarantee for the efficient and stable operation of the internal combustion engine.

[0003] Injection pressure, injection accuracy, and spray effect are core indicators for evaluating the performance of methanol high-pressure injectors: Too low an injection pressure leads to poor methanol atomization and insufficient methanol-gas mixing, thus affecting combustion efficiency; however, too high a rail pressure significantly reduces the long-term reliability of the injector. Furthermore, methanol is more corrosive than traditional fuels, and the control valves of existing injectors are prone to abnormal injection volume and sealing failure due to the combined effects of valve core impact, methanol erosion, and high-pressure cavitation. Although applying a corrosion-resistant coating to the sealing surface can alleviate corrosion problems to some extent, the long-term reliability of the control valve remains unresolved. Summary of the Invention

[0004] The purpose of this invention is to provide a methanol injector control device to solve the problems existing in the prior art.

[0005] To achieve the above objectives, the technical solution adopted by this utility model is as follows: A methanol injector control device, comprising: The oil inlet valve seat has an axially connected control chamber and a return oil throttle hole, and a radially connected oil inlet hole and an oil inlet throttle hole. The top end of the control chamber is connected to the return oil throttle hole, and one side of the control chamber is connected to the oil inlet throttle hole. A control valve seat is located above the oil inlet valve seat. It has an axially connected buffer chamber and oil return hole. The bottom end of the buffer chamber is connected to the top end of the oil return throttle hole. A control valve core, located above the control valve seat, includes a sealing plane and a hemispherical surface; The armature rod is in contact with the hemispherical surface through a conical surface; The top surface of the control valve seat is provided with a sealing ring band surrounding the oil return hole, a pressure relief groove located outside the sealing ring band, and a low-pressure groove located outside the pressure relief groove. The low-pressure groove and the pressure relief groove are connected through a guide groove.

[0006] In some embodiments, the sealing plane is adapted to the sealing ring, and when the methanol injector control device is in the closed state, the sealing plane and the sealing ring fit together to form a sealing structure to block the high-pressure methanol in the return oil hole; The hemispherical surface is adapted to the conical surface so that the control valve core can self-adjust its angle.

[0007] In some embodiments, the oil inlet throttling orifice is located between the oil inlet and the control chamber, and is used to guide high-pressure methanol into the control chamber; the oil return throttling orifice is located between the control chamber and the buffer chamber, and is used to guide methanol in the control chamber into the buffer chamber; The flow rate I / O ratio of the inlet throttle orifice and the return throttle orifice controls the inlet and return oil rates of the methanol injector control device, and the flow rate of the return throttle orifice is greater than the flow rate of the inlet throttle orifice.

[0008] In some embodiments, the control valve seat is made of ceramic, PEEK, or hard alloy. The oil return hole is a non-throttling hole, with a diameter larger than the oil inlet throttling hole and the oil return throttling hole, and the oil return hole extends upward to the top seat surface of the control valve seat.

[0009] In some embodiments, the armature rod is further provided with a process hole, which is located on the side of the conical surface away from the hemisphere, and the process hole is a rotating structure combining a cylinder and a cone; The process hole is used to reduce the resistance encountered when the conical surface rotates at the interface between the conical surface and the hemispherical surface.

[0010] In some embodiments, the control chamber, the return oil throttling orifice, the buffer chamber, and the return oil orifice are all coaxially arranged.

[0011] In some embodiments, there are four guide channels, which are evenly spaced apart.

[0012] The beneficial effects of the technical solution provided by this utility model include at least the following: This technical solution effectively solves the failure problem of traditional methanol injector control valve seats. Traditional metal valve seats are difficult to resist methanol corrosion, high-pressure cavitation, and valve core impact, which can easily lead to abnormal injection flow and sealing failure. The erosion-resistant and cavitation-resistant control valve structure proposed in this solution can significantly improve the above-mentioned damage conditions, enhance the reliability of control valve components, and extend the overall service life of the methanol injector. In addition, this solution reduces the difficulty and cost of material processing. By adopting a planar sealing structure and an integrated inlet and return oil valve seat structure, it realizes the feasibility of processing materials such as ceramics, PEEK, PI, and hard alloys, breaking through the limitations of traditional structures on material processing. This reduces both the difficulty and cost of processing, providing support for the stable application and promotion of methanol injectors. Attached Figure Description

[0013] The accompanying drawings are provided to further understand the present invention and form part of the specification. They are used together with the embodiments of the present invention to explain the present invention and do not constitute a limitation thereof.

[0014] Figure 1 A schematic diagram of the structure of a methanol injector control device provided in an exemplary embodiment of the present invention is shown.

[0015] Figure 2 A schematic diagram of the control valve seat of a methanol injector control device provided in an exemplary embodiment of the present invention is shown.

[0016] Figure 3 It shows Figure 1 A magnified view of part A.

[0017] In the picture: 1. Oil inlet valve seat; 101. Control chamber; 102. Oil inlet hole; 103. Oil inlet throttle hole; 104. Oil return throttle hole; 2. Control valve seat; 201. Buffer chamber; 202. Oil return hole; 203. Sealing ring; 204. Pressure relief groove; 205. Flow guide groove; 206. Low pressure groove; 3. Control valve core; 301. Sealing plane; 302. Hemispherical surface; 4. Handlebar; 401. Conical surface; 402. Process hole. Detailed Implementation

[0018] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0019] In this specification, identical components are represented by the same reference numerals. It should be noted that the terms "front," "rear," "left," "right," "upper," and "lower" used in the following description refer to directions in the accompanying drawings of this utility model, while the terms "bottom surface," "top surface," "inner," and "outer" refer to directions towards or away from a specific component, respectively. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "multiple" means two or more.

[0020] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0021] Please see Figures 1 to 3 The methanol injector control device includes: an inlet valve seat 1, which has an axially connected control chamber 101 and a return oil throttle orifice 104, and a radially connected inlet orifice 102 and an inlet oil throttle orifice 103. The top end of the control chamber 101 is connected to the return oil throttle orifice 104, and one side of the control chamber 101 is connected to the inlet oil throttle orifice 103; and a control valve seat 2, located above the inlet valve seat 1, which has an axially connected buffer chamber 201 and a return oil orifice 202. The bottom end of the buffer chamber 201 is connected to the return oil throttle orifice 103. The top end of the oil throttling orifice 104 is connected; the control valve core 3, which is located above the control valve seat 2, includes a sealing plane 301 and a hemispherical surface 302; the armature rod 4, which is connected to the hemispherical surface 302 through the conical surface 401; wherein, the top seat surface of the control valve seat 2 is provided with a sealing ring 203 surrounding the oil return hole 202, a pressure relief groove 204 located outside the sealing ring 203, and a low pressure groove 206 located outside the pressure relief groove 204, and the low pressure groove 206 and the pressure relief groove 204 are connected through the guide groove 205.

[0022] In this embodiment, the armature rod 4 transmits motion via the conical surface 401, assisting in adjusting the angle of the control valve core 3. The pressure relief groove 204 is used to relieve the pressure of high-pressure methanol at the moment the methanol injector control device closes. The low-pressure groove 206 serves as a buffer chamber, reducing pressure fluctuations in the fluid around the return oil hole 202 at the moment the methanol injector control device closes, thus improving the operational stability of the methanol injector control device. The guide groove 205 is used to relieve the force of high-pressure methanol when the methanol injector control device is in the closed state, alleviating pressure fluctuations around the return oil hole 202, thereby reducing the resistance to the control valve core 3 settling and improving settling stability.

[0023] For details, please refer to Figure 1 and Figure 3The sealing plane 301 is adapted to the sealing ring 203. When the methanol injector control device is in the closed state, the sealing plane 301 and the sealing ring 203 fit together to form a sealing structure to block the high-pressure methanol in the return oil hole 202. The hemispherical surface 302 is adapted to the conical surface 401 so that the control valve core 3 can self-adjust its angle.

[0024] In this embodiment, the planar sealing structure of the control valve seat 2 increases the feasibility of processing, and the sealing plane 301 can always fit with the sealing ring 203 through the self-adjustment capability of the control valve core 3 when the armature rod 4 falls, ensuring the sealing effect of the oil return hole 202.

[0025] For more details, see [link to relevant documentation]. Figure 1 and Figure 3 The inlet throttle orifice 103 is located between the inlet orifice 102 and the control chamber 101, and is used to guide high-pressure methanol into the control chamber 101; the return throttle orifice 104 is located between the control chamber 101 and the buffer chamber 201, and is used to guide methanol in the control chamber 101 into the buffer chamber 201; wherein, the flow rate I / O ratio of the inlet throttle orifice 103 and the return throttle orifice 104 controls the inlet and return oil rates of the methanol injector control device, and the flow rate of the return throttle orifice 104 is greater than the flow rate of the inlet throttle orifice 103.

[0026] Specifically, see Figure 1 and Figure 3 The control valve seat 2 is made of ceramic, PEEK, or hard alloy, and can maintain its original performance even under the erosion and cavitation of highly corrosive fuels. The return oil hole 202 is a non-throttling hole with a larger diameter than the inlet throttling hole 103 and the return oil throttling hole 104. The return oil hole 202 extends upward to the top seat surface of the control valve seat 2, eliminating the need for additional buffer hole structures. Furthermore, since no large-diameter holes such as buffer holes are provided, the plane valve can withstand a higher maximum injection pressure.

[0027] More specifically, see Figure 1 and Figure 3 The armature rod 4 is also provided with a process hole 402. The process hole 402 is located on the side of the conical surface 401 away from the hemispherical surface 302. The process hole 402 is a rotating structure combining a cylinder and a cone. The process hole 402 is used to reduce the resistance encountered when the conical surface 401 and the hemispherical surface 302 rotate, and improve the sealing efficiency when the valve core is seated.

[0028] Further, see Figure 1 and Figure 2 The control chamber 101, the return oil throttling hole 104, the buffer chamber 201, and the return oil hole 202 are all coaxially arranged. There are four guide channels 205, which are evenly spaced.

[0029] Next, the working principle of a methanol injector control device involved in the embodiments of this utility model will be explained.

[0030] Injection start-up phase: When the external solenoid valve is activated, the armature rod 4 is pulled upward, releasing the downward pressure constraint on the control valve core 3. At this time, the high-pressure methanol in the control chamber 101 of the inlet valve seat 1 enters the buffer chamber 201 of the control valve seat 2 through the return oil throttle hole 104, and pushes the sealing plane 301 of the control valve core 3 away from the sealing ring 203 through the return oil hole 202. Because the flow rate of the return oil throttle hole 104 is greater than the flow rate of the inlet oil throttle hole 103, the methanol discharge rate in the control chamber 101 is higher than the replenishment rate, and the pressure in the chamber drops rapidly, forming a pressure difference with the outside. This pressure difference pushes the external needle valve to be quickly lifted by the high-pressure methanol, and the injector starts methanol injection.

[0031] Injection Stopping Stage: When the external solenoid valve is closed, the armature rod 4 resets downward and pushes the control valve core 3 to move. Since the hemispherical surface 302 of the control valve core 3 is adapted to the conical surface 401 of the armature rod 4, the control valve core 3 has self-centering capability and can automatically adjust the angle so that the sealing plane 301 fits the sealing ring 203 of the control valve seat 2. During the seating process, the pressure relief groove 204 of the control valve seat 2 guides the instantaneous high-pressure methanol around the return oil hole 202 to the low-pressure groove 206 through the guide groove 205, effectively reducing the seating resistance of the control valve core 3 and making it efficiently seal the return oil hole 202. After the methanol pressure inside and outside the control chamber 101 tends to be balanced, the external needle valve resets and closes under its own spring pressure, and the injector stops injecting methanol.

[0032] It is worth mentioning that the aforementioned external solenoid valve is the power control component of the methanol injector, which is directly linked to the armature rod 4. Its on / off state determines the start and stop of the injector. When the solenoid valve is energized, it generates an electromagnetic attraction that lifts the armature rod 4 upward, releasing the constraint on the control valve core 3 and creating conditions for pressure regulation in the control chamber 101 and opening of the needle valve. When the solenoid valve is de-energized, the electromagnetic attraction disappears, and the armature rod 4 returns to its original position under its own gravity or the action of the reset structure, pushing the control valve core 3 to achieve sealing and triggering the injection stop process.

[0033] It is worth mentioning that the aforementioned external needle valve is the actuator for methanol injection. It is located in the injection channel of the injector. One end is affected by the pressure difference inside and outside the control chamber 101, and the other end is engaged with the needle valve spring. When the control chamber 101 experiences low pressure due to the flow difference between the return oil throttle orifice 104 and the inlet oil throttle orifice 103, the external high-pressure methanol pushes the needle valve upward to overcome the spring pressure, allowing methanol to be ejected through the injection port. When the pressure in the control chamber 101 returns to equilibrium, the needle valve closes the injection channel downward under the action of the spring rebound force, terminating the injection. Its on / off state directly determines whether the injector outputs methanol.

[0034] In summary, this technical solution effectively addresses the failure problem of traditional methanol injector control valve seats. Traditional metal valve seats are susceptible to methanol corrosion, high-pressure cavitation, and valve core impact, easily leading to abnormal injection flow and sealing failure. The erosion-resistant and cavitation-resistant control valve structure proposed in this solution significantly improves these damage conditions, enhances the reliability of control valve components, and extends the overall service life of the methanol injector. Furthermore, this solution reduces material processing difficulty and cost. By adopting a planar sealing structure and an integrated inlet and return oil valve seat structure, it enables the processing feasibility of materials such as ceramics, PEEK, PI, and hard alloys, breaking through the limitations of traditional structures on material processing. This reduces both the difficulty and cost of processing, providing support for the stable application and promotion of methanol injectors.

[0035] In the embodiments disclosed in this utility model, the terms "installation," "connection," "linking," and "fixing" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; "linking" can be a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments disclosed in this utility model according to the specific circumstances.

[0036] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A methanol injector control device, characterized in that, include: The inlet valve seat (1) has an axially connected control chamber (101) and a return oil throttle hole (104), and a radially connected inlet hole (102) and an inlet oil throttle hole (103). The top end of the control chamber (101) is connected to the return oil throttle hole (104), and one side of the control chamber (101) is connected to the inlet oil throttle hole (103). The control valve seat (2) is located above the oil inlet valve seat (1) and is axially provided with a buffer chamber (201) and an oil return hole (202) that are connected together. The bottom end of the buffer chamber (201) is connected to the top end of the oil return throttle hole (104). The control valve core (3) is located above the control valve seat (2) and includes a sealing plane (301) and a hemispherical surface (302). The armature rod (4) is connected to the hemispherical surface (302) through a conical surface (401); The top surface of the control valve seat (2) is provided with a sealing ring (203) surrounding the oil return hole (202), a pressure relief groove (204) located outside the sealing ring (203), and a low pressure groove (206) located outside the pressure relief groove (204). The low pressure groove (206) and the pressure relief groove (204) are connected through a guide groove (205).

2. The methanol injector control device according to claim 1, characterized in that, The sealing plane (301) is adapted to the sealing ring (203). When the methanol injector control device is in the closed state, the sealing plane (301) and the sealing ring (203) fit together to form a sealing structure to block the high-pressure methanol in the oil return hole (202). The hemispherical surface (302) is adapted to the conical surface (401) so that the control valve core (3) can self-adjust its angle.

3. The methanol injector control device according to claim 1, characterized in that, The oil inlet throttle orifice (103) is located between the oil inlet orifice (102) and the control chamber (101) and is used to guide high-pressure methanol into the control chamber (101); the oil return throttle orifice (104) is located between the control chamber (101) and the buffer chamber (201) and is used to guide methanol in the control chamber (101) into the buffer chamber (201). The flow rate I / O ratio of the inlet throttle orifice (103) and the return throttle orifice (104) controls the inlet and return oil rates of the methanol injector control device, and the flow rate of the return throttle orifice (104) is greater than the flow rate of the inlet throttle orifice (103).

4. The methanol injector control device according to claim 1, characterized in that, The material of the control valve seat (2) is ceramic, PEEK or hard alloy; The oil return hole (202) is a non-throttling hole with a diameter larger than that of the oil inlet throttling hole (103) and the oil return throttling hole (104), and the oil return hole (202) extends upward to the top seat surface of the control valve seat (2).

5. The methanol injector control device according to claim 1, characterized in that, The armature rod (4) is also provided with a process hole (402). The process hole (402) is located on the side of the conical surface (401) away from the hemispherical surface (302). The process hole (402) is a rotating structure combining a cylinder and a cone. The process hole (402) is used to reduce the resistance encountered when the conical surface (401) and the hemispherical surface (302) rotate.

6. The methanol injector control device according to claim 1, characterized in that, The control chamber (101), the return oil throttling hole (104), the buffer chamber (201), and the return oil hole (202) are all coaxially arranged.

7. The methanol injector control device according to claim 1, characterized in that, There are four guide channels (205), and the four guide channels (205) are evenly spaced.

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