Pilot-operated type high-response electromagnetic valve

Abstract

Electric control valve sets are installed at the upper end of an electromagnetic valve shell and in an electromagnetic valve top cover, a control valve element is installed in the electromagnetic valve shell, the upper end of the control valve element is connected with the electric control valve sets, and the lower end of the control valve element is fixedly connected to an end cover on the lower end face of the electromagnetic valve shell through a valve element spring. An oil return opening, a high-pressure oil outlet and a high-pressure oil inlet are formed in the side face of the electromagnetic valve shell from top to bottom, an integrated compact structural design is formed, and the size and electromagnetic force requirements are reduced. The control valve element is provided with an oil inlet hole, an oil inlet throttling hole, a control valve element oil return hole and a high-pressure oil cavity. The control valve element is controlled through the control valve set to achieve dynamic adjustment of the oil pressure of the control cavity, then the axial displacement of the control valve element is controlled, and therefore high-response control over a large-flow oil way is achieved. The structure that the main valve is controlled through the pilot valve is adopted, high-response control over a large-flow oil way is achieved, and meanwhile the size and the electromagnetic force requirement are reduced through the integrated design.

Description

Technical Field

[0001] The invention relates to an electromagnetically driven control valve technology, and is particularly suitable for a high-response, large-flow pilot-operated electromagnetic valve for a fuel injection system of a high-power diesel engine on a ship. Background Art

[0002] As ship automation levels increase, the requirements for hydraulic systems are becoming increasingly stringent. For electromagnetically actuated control valves used in high-power marine diesel engines, the high oil volumes and harsh operating environments of these engines place high demands on the electromagnetic drive control mechanism. Traditional solenoid valves, due to their slow response speed, low control accuracy, and insufficient reliability, struggle to meet the demands of ship automation.

[0003] Traditional solenoid valves (such as CN104214032A) suffer from slow response and poor sealing reliability. Existing pilot valves (such as CN207777747U), while employing a pilot valve structure, require a complex external reset mechanism for the main valve piston, resulting in complex structure and difficult maintenance. Therefore, designing a solenoid valve that can meet the high flow rates, high response, and high reliability of ships is becoming increasingly important. The present invention addresses these drawbacks through an integrated design, optimized oil circuit throttling, and pressure differential drive mechanisms. Summary of the Invention

[0004] The present invention proposes a pilot-operated high-response solenoid valve, which can significantly improve the response speed and control accuracy by controlling the main valve through the pilot valve; at the same time, it also adopts an integrated design, has a compact structure and high reliability.

[0005] To achieve the above-mentioned purpose, the technical solution of the present invention is: a pilot-operated high-response solenoid valve, including a solenoid valve top cover, a control valve group, a solenoid valve housing, a control valve core, an end cover, and a valve core spring. An electric control valve group is installed at the upper end of the solenoid valve housing and in the solenoid valve top cover. A control valve core is installed in the solenoid valve housing. The upper end of the control valve core is connected to the electric control valve group, and the lower end is connected to the end cover fixed on the lower end surface of the solenoid valve housing through a valve core spring; an oil return port, a high-pressure oil outlet and a high-pressure oil inlet are provided on the side of the solenoid valve housing from top to bottom, forming an integrated compact structural design to reduce the volume and electromagnetic force requirements; the control valve core is provided with an oil inlet hole, an oil inlet throttling hole, a control valve core oil return hole and a high-pressure oil chamber; the control valve core is controlled by the control valve group to realize dynamic adjustment of the oil pressure in the control chamber, and then the axial displacement of the valve core is controlled, thereby realizing high-response control of a large-flow oil circuit.

[0006] Furthermore, the control valve group includes an electromagnet assembly, a pull rod, a valve group spring, an armature, a control valve stem, a steel ball, and a ball valve seat. The control valve group adopts an integrated design. The electromagnet assembly is coaxially arranged with the armature. The pull rod passes through the armature and is rigidly connected to the control valve stem. The direction of the valve group spring preload force is opposite to the direction of the electromagnetic force. A steel ball is provided between the control valve stem and the ball valve seat, and the steel ball and the ball valve seat form a detachable sealing structure; a control chamber, a return oil throttling hole, and a return oil hole are provided between the ball valve seat and the control valve core. The steel ball and the ball valve seat are separated / closed by powering on / off the electromagnet assembly, thereby realizing dynamic adjustment of the oil pressure in the control chamber and controlling the axial displacement of the valve core.

[0007] Furthermore, the sealing surface between the steel ball and the ball valve seat has a cone angle of 60°, and the diameter of the steel ball ranges from 3 to 5 mm.

[0008] Furthermore, the ball valve seat is made of tungsten carbide hard alloy material, and the surface of the steel ball is plated with tungsten carbide coating to enhance the wear resistance of the sealing surface and extend the service life.

[0009] Furthermore, the gap between the armature of the control valve group and the electromagnet assembly is 0.1-0.3 mm, and the armature is made of soft magnetic alloy material to improve electromagnetic conversion efficiency and reduce energy consumption.

[0010] Furthermore, the control valve core includes a control chamber, an oil inlet hole, an oil inlet throttling hole, a control valve core oil return hole, and a high-pressure oil chamber. The control valve core is provided with an oil inlet hole, an oil inlet throttling hole, a control valve core oil return hole and a high-pressure oil chamber. The high-pressure oil chamber of the control valve core is directly connected to the high-pressure oil inlet of the solenoid valve housing, and the force area of the high-pressure oil chamber is smaller than the force area of the control chamber. The pressure difference is used to drive the main valve core to reduce dependence on spring force.

[0011] Furthermore, the aperture ratio of the oil inlet throttling hole to the oil return throttling hole is 1:1.2-1.5, 4-6 oil inlet throttling holes are evenly distributed along the circumference of the control valve core, and the aperture tolerance is controlled within ±0.01mm.

[0012] Furthermore, the preload force of the valve core spring is adjustable, and its axis coincides with the movement axis of the control valve core, ensuring the reset accuracy of the main valve core and adapting to different working conditions.

[0013] Furthermore, when the electromagnet assembly in the control valve group is energized, the armature is acted upon by the electromagnet assembly, driving the pull rod to move; at this time, the control valve stem is not acted upon by the spring force, the steel ball is separated from the ball valve seat, the control chamber is connected to the oil return hole, and the high-pressure oil flows back through the high-pressure oil inlet on the solenoid valve housing, the oil inlet hole of the control valve core, the oil inlet throttling hole, the control chamber, the return oil throttling hole, the return oil hole, the control valve core return oil hole, and the oil return hole of the solenoid valve housing in sequence; at this time, the oil pressure in the control chamber is lower than the oil pressure in the high-pressure oil chamber, and the control valve core is in the initial position under the action of the valve core spring.

[0014] Furthermore, when the power to the electromagnet assembly in the control valve group is cut off, the force of the valve group spring acts on the pull rod, the armature, and the control valve stem in sequence, so that the steel ball and the ball valve seat form a seal; the control chamber is disconnected from the oil return hole, and at this time, the high-pressure oil passes through the high-pressure oil inlet on the solenoid valve housing, the oil inlet hole of the control valve core, the oil inlet throttling hole, and the control chamber in sequence; the oil pressure in the control chamber is equal to the oil pressure in the high-pressure oil chamber, and the force area of the control chamber is larger than the force area of the high-pressure oil chamber. The control valve core is moved downward under the action of the oil pressure being greater than the spring force of the valve core spring, so that the high-pressure oil inlet on the solenoid valve housing is connected to the high-pressure oil outlet, thereby realizing high-pressure oil delivery.

[0015] The pilot-operated high-response solenoid valve proposed in the present invention can achieve the following beneficial effects while achieving the expected functions:

[0016] 1) This solenoid valve structure can realize large flow oil delivery while the control valve assembly is highly integrated, compact and takes up little space.

[0017] 2) The solenoid valve structure reduces the demand for electromagnetic force of the pilot electromagnetic drive valve, improves the performance of the pilot electromagnetic drive valve, and increases the reliability of the pilot electromagnetic drive valve.

[0018] 3) The design of the solenoid valve structure improves the response speed of the electromagnetic drive valve, providing possibilities for the expanded application of pilot electromagnetic drive valves.

[0019] 4) This solenoid valve structure achieves high-precision control of large flow lines through an integrated control valve group and a pressure-differential driven main valve core design. Compared to existing technologies, it offers a 50% increase in response speed and a 30% increase in structural compactness, making it suitable for demanding operating conditions such as marine diesel engines. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 Schematic diagram of the overall structure of the pilot-operated high-response solenoid valve of the present invention;

[0021] Figure 2 It is a schematic diagram of the control valve group structure;

[0022] Figure 3 It is a schematic diagram of the control valve core structure;

[0023] Figure 1 ,3, (a) is the main sectional view, and (b) is the left sectional view. DETAILED DESCRIPTION

[0024] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0025] like Figure 1As shown in (a) and (b), a pilot-operated high-response solenoid valve of the present invention includes a solenoid valve top cover 001, a control valve group 002, a solenoid valve housing 003, a control valve core 004, an end cover 005, a valve core spring 006 and other components.

[0026] An electric control valve group 002 is installed at the upper end of the solenoid valve housing 003 and the solenoid valve top cover 001. A control valve core 004 is installed in the solenoid valve housing 003. The upper end of the control valve core 004 is connected to the electric control valve group 002, and the lower end is connected to the end cover 005 fixed on the lower end surface of the solenoid valve housing 003 through the valve core spring 006; the side of the solenoid valve housing 003 is provided with an oil return port, a high-pressure oil outlet and a high-pressure oil inlet from bottom to bottom, forming an integrated compact structural design, and the structure of the main valve is controlled by the pilot valve to achieve high-response control of the large-flow oil circuit. At the same time, the integrated design reduces the volume and electromagnetic force requirements.

[0027] like Figure 2 As shown, the control valve group 002 includes an electromagnet assembly 007, a pull rod 008, a valve group spring 009, an armature 010, a control valve stem 011, a steel ball 012, and a ball valve seat 013; in addition, it also includes a control chamber 014, an oil return throttling hole 015, and an oil return hole 016 jointly constructed by the control valve group and the control valve core.

[0028] The control valve group 002 adopts an integrated design. The electromagnet assembly 007 is coaxially arranged with the armature 010. The pull rod 008 passes through the armature 010 and is rigidly connected to the control valve stem 011. The direction of the preload force of the valve group spring 009 is opposite to the direction of the electromagnetic force. A steel ball 012 is provided between the control valve stem 011 and the ball valve seat 013, and the steel ball 012 and the ball valve seat 013 form a detachable sealing structure; a control chamber 014, a return oil throttling hole 015, and a return oil hole 016 are provided between the ball valve seat 013 and the control valve core 004. The steel ball 012 and the ball valve seat 013 are separated / closed by powering on / off the electromagnet assembly 007, thereby realizing dynamic adjustment of the oil pressure in the control chamber 014, thereby controlling the axial displacement of the valve core 004.

[0029] Preferably, the sealing surface between the steel ball 012 and the ball valve seat 013 has a cone angle of 60°, the diameter of the steel ball 012 ranges from 3 to 5 mm, the ball valve seat 013 is made of tungsten carbide hard alloy material, and the surface of the steel ball 012 is plated with tungsten carbide coating to enhance the wear resistance of the sealing surface and extend the service life.

[0030] Preferably, the gap between the armature 010 of the control valve group 002 and the electromagnet assembly 007 is 0.1-0.3 mm, and the armature 010 is made of soft magnetic alloy material to improve electromagnetic conversion efficiency and reduce energy consumption.

[0031] like Figure 3As shown in (a) and (b), the control valve core 004 includes a control chamber 014, an oil inlet hole 017, an oil inlet throttling hole 018, a control valve core oil return hole 019, and a high-pressure oil chamber 020.

[0032] The control valve core 004 is provided with an oil inlet hole 017, an oil inlet throttling hole 018, a control valve core oil return hole 019 and a high-pressure oil chamber 020. The high-pressure oil chamber 020 of the control valve core 004 is directly connected to the high-pressure oil inlet of the solenoid valve housing 003, and the force area of the high-pressure oil chamber 020 is smaller than the force area of the control chamber 014. The pressure difference is used to drive the main valve core, reducing dependence on spring force.

[0033] Preferably, the aperture ratio of the oil inlet throttling hole 018 to the oil return throttling hole 015 is 1:1.2-1.5, and 4-6 oil inlet throttling holes 018 are evenly distributed along the circumference of the control valve core 004, and the aperture tolerance is controlled at ±0.01mm.

[0034] Preferably, the preload force of the valve core spring 006 is adjustable, and its axis coincides with the movement axis of the control valve core 004, ensuring the reset accuracy of the main valve core and adapting to different working conditions.

[0035] The pilot-operated electromagnetic control valve proposed in this invention has a compact structure, occupies a small space, has low electromagnetic force requirements, and can adapt to the working conditions of high-power diesel engines with large oil volumes and harsh working environments. Its implementation is as follows:

[0036] When the electromagnet assembly 007 in the control valve group 002 is energized, the armature 010 is acted upon by the electromagnet assembly 007, driving the pull rod 008 to move; at this time, the control valve stem 011 is not acted upon by the spring force, the steel ball 012 is separated from the ball valve seat 013, the control chamber 014 is connected to the oil return hole 016, and the high-pressure oil flows back through the high-pressure oil inlet on the solenoid valve housing 003 → the oil inlet hole 017 of the control valve core 004 → the oil inlet throttle hole 018 → the control chamber 014 → the return oil throttle hole 015 → the return oil hole 016 → the control valve core return oil hole 019 → the oil return hole of the solenoid valve housing 003; at this time, the oil pressure in the control chamber 014 is less than the oil pressure in the high-pressure oil chamber 020, and the control valve core 004 is in the initial position under the action of the valve core spring 006.

[0037] When the electromagnet assembly 007 in the control valve group 002 is powered off, the force of the valve group spring 009 acts on the pull rod 008 → armature 010 → control valve stem 011, so that the steel ball 012 forms a seal with the ball valve seat 013; the control chamber 014 is disconnected from the oil return hole, and at this time the high-pressure oil passes through the high-pressure oil inlet on the solenoid valve housing 003 → the oil inlet hole 017 of the control valve core 004 → the oil inlet throttle hole 018 → the control chamber 014; the oil pressure in the control chamber 014 is equal to the oil pressure in the high-pressure oil chamber 020, and the force area of the control chamber 014 is larger than the force area of the high-pressure oil chamber 020, and the control valve core 004 is acted upon by the oil pressure (greater than the spring force of the valve core spring 006) to move downward, so that the high-pressure oil inlet on the solenoid valve housing 003 is connected to the high-pressure oil outlet, thereby realizing high-pressure oil delivery.

[0038] This is only one embodiment of the present application and does not cover all protection contents. Simple variations based on the core structure of the present application, such as the arrangement of needle valve components and the form of fuel injection control to achieve the same function, are all within the scope of protection of the present application.

Claims

1. A pilot-operated high-response solenoid valve, characterized in that: It includes a solenoid valve top cover, a control valve group, a solenoid valve shell, a control valve core, an end cover, and a valve core spring. The electric control valve group is installed on the upper end of the solenoid valve shell and in the solenoid valve top cover. The control valve core is installed in the solenoid valve shell. The upper end of the control valve core is connected to the electric control valve group, and the lower end is connected to the end cover fixed on the lower end surface of the solenoid valve shell through the valve core spring; the side of the solenoid valve shell is provided with an oil return port, a high-pressure oil outlet and a high-pressure oil inlet from top to bottom, forming an integrated compact structure design to reduce the volume and electromagnetic force requirements; the control valve core is provided with an oil inlet hole, an oil inlet throttling hole, a control valve core oil return hole and a high-pressure oil chamber; the control valve core is controlled by the control valve group to realize dynamic adjustment of the oil pressure in the control chamber, and then the axial displacement of the valve core is controlled, thereby realizing high-response control of large-flow oil circuits.

2. The pilot-operated high-response solenoid valve according to claim 1, characterized in that: The control valve group includes an electromagnet assembly, a pull rod, a valve group spring, an armature, a control valve stem, a steel ball, and a ball valve seat. The control valve group adopts an integrated design. The electromagnet assembly and the armature are coaxially arranged. The pull rod passes through the armature and is rigidly connected to the control valve stem. The direction of the valve group spring preload force is opposite to the direction of the electromagnetic force. A steel ball is provided between the control valve stem and the ball valve seat, and the steel ball and the ball valve seat form a detachable sealing structure; a control chamber, a return oil throttle hole, and a return oil hole are provided between the ball valve seat and the control valve core. The steel ball and the ball valve seat are separated / closed by energizing / de-energizing the electromagnet assembly, thereby realizing dynamic adjustment of the oil pressure in the control chamber and controlling the axial displacement of the valve core.

3. The pilot-operated high-response solenoid valve according to claim 2, characterized in that: The sealing surface between the steel ball and the ball valve seat has a 60° cone angle, and the diameter of the steel ball ranges from 3 to 5 mm.

4. The pilot-operated high-response solenoid valve according to claim 2, characterized in that: The ball valve seat is made of tungsten carbide hard alloy material, and the surface of the steel ball is plated with tungsten carbide coating to enhance the wear resistance of the sealing surface and extend the service life.

5. The pilot-operated high-response solenoid valve according to claim 2, characterized in that: The gap between the armature of the control valve group and the electromagnet assembly is 0.1-0.3mm, and the armature is made of soft magnetic alloy material to improve electromagnetic conversion efficiency and reduce energy consumption.

6. The pilot-operated high-response solenoid valve according to claim 1, characterized in that: The control valve core includes a control chamber, an oil inlet hole, an oil inlet throttling hole, a control valve core oil return hole, and a high-pressure oil chamber. The control valve core is provided with an oil inlet hole, an oil inlet throttling hole, a control valve core oil return hole and a high-pressure oil chamber. The high-pressure oil chamber of the control valve core is directly connected to the high-pressure oil inlet of the solenoid valve housing, and the force area of the high-pressure oil chamber is smaller than the force area of the control chamber. The pressure difference is used to drive the main valve core to reduce dependence on spring force.

7. The pilot-operated high-response solenoid valve according to claim 6, characterized in that: The aperture ratio of the oil inlet throttling hole to the oil return throttling hole is 1:1.2-1.

5. There are 4-6 oil inlet throttling holes evenly distributed along the circumference of the control valve core, and the aperture tolerance is controlled within ±0.01mm.

8. The pilot-operated high-response solenoid valve according to claim 1, characterized in that: The preload force of the valve core spring is adjustable, and its axis coincides with the movement axis of the control valve core, ensuring the reset accuracy of the main valve core and adapting to different working conditions.

9. The pilot-operated high-response solenoid valve according to any one of claims 1 to 8, characterized in that: When the electromagnet assembly in the control valve group is energized, the armature is acted upon by the electromagnet assembly, driving the pull rod to move; at this time, the control valve stem is not acted upon by the spring force, the steel ball is separated from the ball valve seat, the control chamber is connected to the oil return hole, and the high-pressure oil flows back through the high-pressure oil inlet on the solenoid valve housing, the oil inlet hole of the control valve core, the oil inlet throttling hole, the control chamber, the return oil throttling hole, the return oil hole, the control valve core oil return hole, and the oil return hole of the solenoid valve housing in sequence; at this time, the oil pressure in the control chamber is lower than the oil pressure in the high-pressure oil chamber, and the control valve core is located in the initial position under the action of the valve core spring.

10. The pilot-operated high-response solenoid valve according to claim 9, characterized in that: When the power is cut off for the electromagnet assembly in the control valve group, the force of the valve group spring acts on the pull rod, the armature and the control valve stem in sequence, so that the steel ball and the ball valve seat are sealed; the control chamber is disconnected from the oil return hole. At this time, the high-pressure oil passes through the high-pressure oil inlet on the solenoid valve housing, the oil inlet hole of the control valve core, the oil inlet throttle hole and the control chamber in sequence; the oil pressure in the control chamber is equal to the oil pressure in the high-pressure oil chamber, and the force area of the control chamber is larger than the force area of the high-pressure oil chamber. The control valve core is acted upon by the oil pressure being greater than the spring force of the valve core spring and moves downward, so that the high-pressure oil inlet on the solenoid valve housing is connected to the high-pressure oil outlet, thereby realizing high-pressure oil delivery.

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