Pilot operated high response solenoid valve

Abstract

The present application relates to a kind of pilot high-response electromagnetic valve, and electric control valve group is installed in the upper end of electromagnetic valve shell and electromagnetic valve top cover, control valve core is installed in the electromagnetic valve shell, control valve core upper end is connected electric control valve group, and lower end is connected fixed in the end cover on the lower end surface of electromagnetic valve shell by valve core spring;Electromagnetic valve shell side is provided with oil return port, high-pressure oil outlet and high-pressure oil inlet from top to bottom, and constitutes integrated compact structure design, reduces volume and electromagnetic force demand;Control valve core is provided with oil inlet hole, oil inlet throttle hole, control valve core oil return hole and high-pressure oil cavity;The dynamic regulation of control cavity oil pressure is realized by control valve core through control valve group control control valve core, and then the axial displacement of control valve core is controlled, thereby realizing the high-response control of large-flow oil circuit.The structure of the present application is realized by pilot valve control main valve, realizes the high-response control of large-flow oil circuit, and integrated design reduces volume and electromagnetic force demand.

Description

Technical Field

[0001] This invention relates to electromagnetic drive control valve technology, and is particularly applicable to high-response, high-flow pilot-operated solenoid valves for fuel injection systems of high-power marine diesel engines. Background Technology

[0002] As ship automation levels increase, the requirements for hydraulic systems are becoming increasingly stringent. For electromagnetic drive control valves used in high-power marine diesel engines, the large oil volume required and harsh operating environment of these engines necessitate high-performance electromagnetic drive control mechanisms. Traditional solenoid valves, due to their slow response speed, low control accuracy, and insufficient reliability, are ill-suited to meet the demands of ship automation.

[0003] Traditional solenoid valves (such as CN104214032A) suffer from slow response speed and poor sealing reliability. While existing pilot valves (such as CN207777747U) employ a pilot valve structure, their main valve piston requires a complex external reset mechanism, leading to structural complexity and maintenance difficulties. Therefore, designing a solenoid valve that meets the requirements of high flow rate, high response, and high reliability in marine applications is increasingly important. This invention addresses these shortcomings through integrated design and optimized oil circuit throttling and differential pressure drive mechanisms. Summary of the Invention

[0004] This invention proposes a pilot-operated high-response solenoid valve, which significantly improves response speed and control accuracy by controlling the main valve through a pilot valve; it also adopts an integrated design, resulting in a compact structure and high reliability.

[0005] To achieve the above objectives, the technical solution of the present invention is as follows: a pilot-operated high-response solenoid valve, comprising a solenoid valve top cover, a control valve assembly, a solenoid valve housing, a control valve core, an end cover, and a valve core spring. An electric control valve assembly is installed on the upper end of the solenoid valve housing and inside the solenoid valve top cover. A control valve core is installed inside the solenoid valve housing. The upper end of the control valve core is connected to the electric control valve assembly, and the lower end is connected to and fixed to the end cover on the lower end face of the solenoid valve housing via the valve core spring. The side of the solenoid valve housing has a return oil port, a high-pressure oil outlet, and a high-pressure oil inlet from top to bottom, forming an integrated and compact structural design that reduces volume and electromagnetic force requirements. The control valve core has an oil inlet hole, an oil inlet throttling hole, a control valve core return oil hole, and a high-pressure oil chamber. The control valve assembly controls the control valve core to achieve dynamic adjustment of the oil pressure in the control chamber, thereby controlling the axial displacement of the valve core and achieving high-response control of a large-flow oil circuit.

[0006] Furthermore, the control valve assembly includes an electromagnet assembly, a pull rod, a valve assembly spring, an armature, a control valve stem, a steel ball, and a ball valve seat. The control valve assembly adopts an integrated design, with the electromagnet assembly and the armature arranged coaxially. The pull rod passes through the armature and is rigidly connected to the control valve stem. The preload of the valve assembly spring is in the opposite direction to 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 separable 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. By energizing / de-energizing the electromagnet assembly, the steel ball is driven to separate / close with the ball valve seat, thereby realizing the 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 60° cone angle, 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 coated with tungsten carbide to enhance the wear resistance of the sealing surface and extend its service life.

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

[0010] Furthermore, the control valve core includes a control chamber, an oil inlet, an oil inlet throttling orifice, a control valve core return oil orifice, and a high-pressure oil chamber. The control valve core is provided with an oil inlet, an oil inlet throttling orifice, a control valve core return oil orifice, 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-bearing area of ​​the high-pressure oil chamber is smaller than that of the control chamber. The main valve core is driven by pressure difference, reducing the dependence on spring force.

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

[0012] Furthermore, the preload of the valve core spring is adjustable, and its axis coincides with the motion 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 subjected to the force of the electromagnet assembly, which drives the lever to move. At this time, the control valve stem is not subjected to the spring force, the steel ball separates from the ball valve seat, the control chamber is connected to the return oil hole, and the high-pressure oil flows back sequentially through the high-pressure oil inlet on the solenoid valve body, the oil inlet hole of the control valve core, the oil inlet throttle hole, the control chamber, the return oil throttle hole, the return oil hole, the control valve core return oil hole, and the return oil hole of the solenoid valve body. At this time, the oil pressure in the control chamber is less 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.

[0014] Furthermore, when the electromagnet assembly in the control valve group is de-energized, the force of the valve group spring acts sequentially on the pull rod, armature, and control valve stem, causing the steel ball to form a seal with the ball valve seat; the control chamber is disconnected from the return oil hole, and at this time, high-pressure oil passes sequentially 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; the oil pressure in the control chamber is equal to the oil pressure in the high-pressure oil chamber, and the force-bearing area of ​​the control chamber is greater than that of the high-pressure oil chamber. The control valve core is subjected to the force of the spring force, which is greater than that of the valve core spring, and moves downward, connecting the high-pressure oil inlet and the high-pressure oil outlet on the solenoid valve housing, thus realizing the delivery of high-pressure oil.

[0015] The pilot-operated high-response solenoid valve proposed in this invention can produce the following beneficial effects while achieving the expected function:

[0016] 1) This solenoid valve structure achieves high-flow oil delivery while highly integrating the control valve components, resulting in a compact structure and small footprint.

[0017] 2) This solenoid valve structure reduces the electromagnetic force required by the pilot-operated solenoid valve, improves the performance of the pilot-operated solenoid valve, and enhances the reliability of the pilot-operated solenoid valve.

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

[0019] 4) This solenoid valve structure achieves high-precision control of large-flow oil circuits through integrated control valve group and differential pressure driven main valve core design. Compared with existing technologies, the response speed is improved by 50%, the structural compactness is improved by 30%, and it is suitable for harsh operating conditions such as marine diesel engines. Attached Figure Description

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

[0021] Figure 2 This is a schematic diagram of the control valve assembly structure;

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

[0023] Figure 1 In 3, (a) is the main sectional view and (b) is the left sectional view. Detailed Implementation

[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 components such as a solenoid valve top cover 001, a control valve assembly 002, a solenoid valve housing 003, a control valve core 004, an end cover 005, and a valve core spring 006.

[0026] An electrically controlled valve assembly 002 is installed on the upper end of the solenoid valve housing 003 and inside the solenoid valve top cover 001. A control valve core 004 is installed inside the solenoid valve housing 003. The upper end of the control valve core 004 is connected to the electrically controlled valve assembly 002, and the lower end is connected to and fixed to the end cover 005 on the lower end face of the solenoid valve housing 003 through a valve core spring 006. The side of the solenoid valve housing 003 has a return oil port, a high-pressure oil outlet, and a high-pressure oil inlet from bottom to top, forming an integrated and compact structural design. 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 size and electromagnetic force requirements.

[0027] like Figure 2 As shown, the control valve assembly 002 includes an electromagnet assembly 007, a pull rod 008, a valve assembly 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, a return oil throttling hole 015, and a return oil hole 016, which are jointly constructed by the control valve assembly and the control valve core.

[0028] The control valve assembly 002 adopts an integrated design. The electromagnet assembly 007 and the armature 010 are arranged coaxially. The pull rod 008 passes through the armature 010 and is rigidly connected to the control valve stem 011. The preload of the valve assembly 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 separable 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. By energizing / de-energizing the electromagnet assembly 007, the steel ball 012 and the ball valve seat 013 are separated / closed, realizing the 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 surfaces of the steel ball 012 and the ball valve seat 013 have a 60° cone angle, the diameter of the steel ball 012 is in the range of 3-5mm, the ball valve seat 013 is made of tungsten carbide hard alloy material, and the surface of the steel ball 012 is coated with tungsten carbide coating to enhance the wear resistance of the sealing surface and extend its service life.

[0030] Preferably, the gap between the armature 010 of the control valve assembly 002 and the electromagnet assembly 007 is 0.1-0.3mm, 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 throttle hole 018, a control valve core 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 throttle hole 018, a control valve core 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-bearing area of ​​the high-pressure oil chamber 020 is smaller than the force-bearing area of ​​the control chamber 014. The main valve core is driven by pressure difference, reducing the dependence on spring force.

[0033] Preferably, the diameter 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 around the control valve core 004, with the diameter tolerance controlled within ±0.01mm.

[0034] Preferably, the preload of the valve core spring 006 is adjustable, and its axis coincides with the motion 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 solenoid control valve proposed in this invention has a compact structure, occupies little space, requires low electromagnetic force, and can adapt to the harsh working conditions of high-power diesel engines with large oil volumes. Its implementation is as follows:

[0036] When the electromagnet assembly 007 in the control valve assembly 002 is energized, the armature 010 is subjected to the force of the electromagnet assembly 007, which drives the pull rod 008 to move. At this time, the control valve stem 011 is not subjected to the spring force, the steel ball 012 separates from the ball valve seat 013, the control chamber 014 is connected to the return oil 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 return oil 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 de-energized, the force of the valve group spring 009 acts on the pull rod 008 → armature 010 → control valve stem 011, causing the steel ball 012 to form a seal with the ball valve seat 013; the control chamber 014 is disconnected from the return oil hole. At this time, 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-bearing area of ​​the control chamber 014 is greater than that of the high-pressure oil chamber 020. The control valve core 004 is subjected to the oil pressure (greater than the spring force of the valve core spring 006) and moves downward, connecting the high-pressure oil inlet on the solenoid valve housing 003 with the high-pressure oil outlet, thus realizing the high-pressure oil delivery.

[0038] This is merely one embodiment of this application and does not cover all the protected content. Simple modifications made based on the core structure of this application, such as the arrangement of needle valve assemblies and the form of fuel injection control to achieve the same function, are all within the protection scope of this application.

Claims

1. A pilot-operated high-response solenoid valve, characterized in that, The system includes a solenoid valve top cover, a control valve assembly, a solenoid valve housing, a control valve core, an end cover, and a valve core spring. The electrically controlled valve assembly is installed on the upper end of the solenoid valve housing and inside the solenoid valve top cover. The control valve core is installed inside the solenoid valve housing. The upper end of the control valve core is connected to the electrically controlled valve assembly, and the lower end is connected to the end cover fixed to the lower end face of the solenoid valve housing via the valve core spring. The side of the solenoid valve housing has a return oil port, a high-pressure oil outlet, and a high-pressure oil inlet, forming an integrated and compact structural design that reduces size and electromagnetic force requirements. The control valve core includes a control chamber and an oil inlet. The control valve core is equipped with an oil inlet throttling orifice, a control valve core return oil orifice, 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-bearing area of ​​the high-pressure oil chamber is smaller than that of the control chamber. The control valve core is driven by the pressure difference, reducing the dependence on spring force. The control valve core is controlled by the control valve group to realize the dynamic adjustment of the oil pressure in the control chamber, thereby controlling the axial displacement of the valve core, thus realizing high-response control of the large flow oil circuit.

2. The pilot-operated high-response solenoid valve according to claim 1, characterized in that, The control valve assembly includes an electromagnet assembly, a pull rod, a valve assembly spring, an armature, a control valve stem, a steel ball, and a ball valve seat. The control valve assembly adopts an integrated design, with the electromagnet assembly and armature arranged coaxially. The pull rod passes through the armature and is rigidly connected to the control valve stem. The preload of the valve assembly spring is in the opposite direction to 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 separable sealing structure. A control chamber, a return oil throttling orifice, and a return oil hole are provided between the ball valve seat and the control valve core. By energizing / de-energizing the electromagnet assembly, the steel ball is driven to separate / close with the ball valve seat, thereby achieving 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 coated with tungsten carbide to enhance the wear resistance of the sealing surface and extend its service life.

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

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

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

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

8. The pilot-operated high-response solenoid valve according to any one of claims 1-7, characterized in that, When the electromagnet assembly in the control valve group is energized, the armature is subjected to the force of the electromagnet assembly, which drives the lever to move. At this time, the control valve stem is not subjected to the spring force, the steel ball separates from the ball valve seat, and the control chamber is connected to the return oil hole. The high-pressure oil flows back sequentially through the high-pressure oil inlet on the solenoid valve body, the oil inlet hole of the control valve core, the oil inlet throttle hole, the control chamber, the return oil throttle hole, the return oil hole, the control valve core return oil hole, and the return oil hole of the solenoid valve body. At this time, the oil pressure in the control chamber is less 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.

9. The pilot-operated high-response solenoid valve according to claim 8, characterized in that, When the electromagnet assembly in the control valve group is de-energized, the force of the valve group spring acts sequentially on the pull rod, armature, and control valve stem, causing the steel ball to seal with the ball valve seat; the control chamber is disconnected from the return oil hole. At this time, high-pressure oil passes sequentially 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; the oil pressure in the control chamber is equal to the oil pressure in the high-pressure oil chamber, and the force-bearing area of ​​the control chamber is greater than that of the high-pressure oil chamber. The control valve core is subjected to the force of the spring force, which is greater than that of the valve core spring, and moves downward, connecting the high-pressure oil inlet and high-pressure oil outlet on the solenoid valve housing, thus realizing the delivery of high-pressure oil.

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