A pilot operated solenoid valve

Abstract

The application discloses a pilot electromagnetic valve, which comprises a main valve bush and a shell, a main valve stop seat is arranged in the front end opening of the main valve bush, an armature stop seat is arranged at the tail end opening of the shell, the main valve stop seat can move in the main valve bush in the axial direction to adjust the area of the tail end of the main valve stop seat to shield the oil outlet, a nozzle is arranged at the tail end of the main valve bush, a main valve spool is arranged between the main valve stop seat and the nozzle, the main valve spool can move in the main valve bush in the axial direction through hydraulic change, a coil assembly and an armature assembly are arranged in the shell, the armature assembly can move in the axial direction, a thickness adjusting gasket is arranged between the tail end of the armature assembly and the armature stop seat to adjust the axial stroke of the armature assembly. The outlet flow is adjusted by adjusting the position of the main valve stop seat, the axial stroke of the armature assembly is adjusted through the thickness adjusting gasket, and then the response time is adjusted, so that low energy consumption, fast response time, wide valve port flow range, response time adjustment and flow range adjustment are realized, and the adjustment of the response time and the adjustment of the flow range do not affect each other.

Description

Technical Field

[0001] This invention relates to the field of solenoid valves, and in particular to a pilot-operated solenoid valve. Background Technology

[0002] As a crucial control component of the fuel servo mechanism, the solenoid valve faces increasingly stringent requirements due to advancements in aviation technology, particularly regarding energy consumption, response time, and fuel flow range. Throughout the design process of the fuel servo system, the solenoid valve must maintain a wide orifice flow range, low energy consumption, and rapid response time under a given pressure differential.

[0003] It is not easy to achieve the requirements of ensuring both the flow rate at the valve orifice and the rapid and reliable response time under a certain energy consumption for a general solenoid valve. Or, even if the solenoid valve achieves the requirement of rapid and reliable response time under a certain energy consumption, the flow rate at the valve orifice often cannot meet the design requirements.

[0004] Therefore, how to provide a pilot-operated solenoid valve whose response time and valve orifice flow can be adjusted independently without affecting each other is a technical problem that needs to be solved by those skilled in the art. Summary of the Invention

[0005] The purpose of this invention is to provide a pilot-operated solenoid valve that achieves low energy consumption, fast response time, and a wide range of flow rates at the valve orifice, with the adjustment of response time and flow range not affecting each other.

[0006] To solve the above-mentioned technical problems, the present invention provides a pilot-operated solenoid valve, comprising an axially penetrating main valve bushing and a housing. A main valve stop seat is installed in the opening at the front end of the main valve bushing. An oil outlet is provided in the middle of the side wall of the main valve bushing. The opening at the rear end of the main valve bushing connects to the opening at the front end of the housing. An armature stop seat is provided at the opening at the rear end of the housing. The main valve stop seat can move axially within the main valve bushing to adjust the area of ​​the oil outlet blocked by the rear end of the main valve stop seat. A nozzle is installed at the rear end of the main valve bushing, and a space is provided between the main valve stop seat and the nozzle. The system includes a main valve core, with the first end opening of the main valve stop seat serving as an oil inlet. The last end opening of the main valve stop seat connects to the first end opening of the nozzle via an axial through-hole in the main valve core. The main valve core can move axially within the main valve bushing via hydraulic changes to close or open the last end opening of the main valve stop seat. A coil assembly and an armature assembly are installed inside the housing. The armature assembly can move axially to close or open the last end opening of the nozzle. A thickness adjustment shim is provided between the end of the armature assembly and the armature stop seat to adjust the axial travel of the armature assembly.

[0007] Preferably, the force-bearing area at the beginning of the main valve core is smaller than that at the end, and a damping adjustment screw is provided in the axial through hole of the main valve core for adjusting the pressure difference between the two ends of the main valve core.

[0008] Preferably, a main valve spring is provided between the main valve core and the nozzle.

[0009] Preferably, the outer periphery of the main valve core is provided with a plurality of annular grooves arranged sequentially along the axial direction.

[0010] Preferably, an armature spring is provided between the armature assembly and the armature stop.

[0011] Preferably, the armature spring and the armature stop are detachably connected to the housing to allow for the replacement of armature springs with different elasticities and / or armature stops with different insertion lengths.

[0012] Preferably, the end of the main valve bushing extends into the opening at the beginning of the housing, a guide sleeve is fixedly installed inside the housing, the guide sleeve presses against the nozzle, and the beginning of the armature assembly passes through the guide sleeve and is aligned with the nozzle.

[0013] Preferably, the main valve bushing is welded to or interference-fitted with the housing, and the guide sleeve is threaded to the inner wall of the housing.

[0014] Preferably, a filter screen is provided at the oil inlet, and an opening is provided on the side of the housing for the lead wire to pass through.

[0015] Preferably, the main valve bushing has an internal thread in the opening at the beginning, and the main valve stop seat has an external thread on its outer circumference. The two are threadedly connected and generate axial displacement through rotation.

[0016] This invention provides a pilot-operated solenoid valve, comprising an axially penetrating main valve bushing and a housing. A main valve stop seat is installed within the opening at the front end of the main valve bushing. An oil outlet is provided in the middle of the side wall of the main valve bushing. The opening at the rear end of the main valve bushing connects to the opening at the front end of the housing. An armature stop seat is provided at the rear end of the housing. The main valve stop seat can move axially within the main valve bushing to adjust the area of ​​the oil outlet blocked by the rear end of the main valve stop seat. A nozzle is installed at the rear end of the main valve bushing. A main valve valve is positioned between the main valve stop seat and the nozzle. The main valve core has an oil inlet at the first end of the main valve stop seat and an outlet at the end of the main valve stop seat connected to the nozzle opening at the first end through the axial through hole of the main valve core. The main valve core can move axially within the main valve bushing by hydraulic change to close or open the outlet of the main valve stop seat. A coil assembly and an armature assembly are installed inside the housing. The armature assembly can move axially to close or open the outlet of the nozzle. A thickness adjustment shim is provided between the end of the armature assembly and the armature stop seat to adjust the axial travel of the armature assembly.

[0017] During use, the outlet flow rate is adjusted by adjusting the position of the main valve stop seat, and the axial travel of the armature assembly is adjusted by adjusting the thickness adjustment shim, thereby adjusting the response time. This achieves low energy consumption, fast response time, and a wide range of valve port flow rates, with the adjustment of response time and flow range not affecting each other. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of a specific embodiment of the pilot-operated solenoid valve provided by the present invention. Detailed Implementation

[0019] The core of this invention is to provide a pilot-operated solenoid valve that achieves low energy consumption, fast response time, and a wide range of valve orifice flow rates, with the adjustment of response time and flow range not affecting each other.

[0020] To enable those skilled in the art to better understand the present invention, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Please refer to Figure 1 , Figure 1 This is a schematic diagram of a specific embodiment of the pilot-operated solenoid valve provided by the present invention.

[0022] This invention provides a pilot-operated solenoid valve, comprising a main valve bushing 1 and a housing 2 connected end-to-end. The beginning and end ends of each component are defined according to the direction of oil flow. Figure 1 The left side is the beginning and the right side is the end. Both the main valve bushing 1 and the outer shell 2 are axially through sleeve structures, that is, they are hollow inside and have openings at both the beginning and the end. The opening at the end of the main valve bushing 1 is connected to the opening at the beginning of the outer shell 2.

[0023] The main valve bushing 1 contains a main valve stop seat 3, a main valve core 6, and a nozzle 5, all installed sequentially. Each component has an axially extending through hole in its center. Specifically, the main valve stop seat 3 is installed at the opening at the beginning of the main valve bushing 1, the nozzle 5 is installed at the opening at the end of the main valve bushing 1, and the main valve core 6 is located between the main valve stop seat 3 and the nozzle 5. The housing 2 contains an armature stop seat 4, a coil assembly 7, and an armature assembly 8. Specifically, the armature stop seat 4 is installed at the opening at the end of the housing 2, the armature assembly 8 is located between the armature stop seat 4 and the nozzle 5, and the coil assembly 7 is arranged around the armature assembly 8.

[0024] The first end opening of the main valve stop seat 3 is the oil inlet P, and the middle of the side wall of the main valve bushing 1 is provided with an oil outlet T. The main valve stop seat 3 can move axially within the main valve bushing 1. The end of the main valve stop seat 3 extends into the middle of the main valve bushing 1 until it reaches the oil outlet T. As the main valve stop seat 3 moves axially towards the end, it will gradually block the oil outlet T. When it moves in the opposite direction, it will gradually open the oil outlet T. That is, by adjusting the area of ​​the oil outlet T blocked by the end of the main valve stop seat 3, the opening degree of the oil outlet T can be adjusted, and finally the outlet flow rate can be adjusted.

[0025] Furthermore, the armature assembly 8 can move axially under the action of the coil assembly 7 to close or open the end opening of the nozzle 5. At the same time, a thickness adjustment shim 9 is provided between the end of the armature assembly 8 and the armature stop 4. By replacing the thickness adjustment shim 9 with different thicknesses and materials, the axial travel of the armature assembly 8 can be adjusted. The shorter the axial travel, the faster the response time, and ultimately the response time adjustment is achieved.

[0026] The end opening of the main valve stop seat 3 is connected to the beginning opening of the nozzle 5 through the axial through hole of the main valve core 6. The movement of the armature assembly 8 causes a pressure change in the cavity. The main valve core 6 can move axially within the main valve bushing 1 through hydraulic change to close or open the end opening of the main valve stop seat 3.

[0027] Preferably, a main valve spring 11 is provided between the main valve core 6 and the nozzle 5, and an armature spring 12 is provided between the armature assembly 8 and the armature stop 4 to realize the reset of the moving parts and provide a certain force to provide part of the power for the valve body to work. Further, a step is provided at the end of the through hole in the main valve core 6, and the main valve spring 11 extends into the through hole of the main valve core 6. A step is provided at the end of the through hole in the armature assembly 8, and the armature spring 12 extends into the through hole of the armature assembly 8.

[0028] The armature spring 12 and armature stop 4 are detachably connected to the outer shell 2, so that armature springs 12 with different elasticity and / or armature stop 4 with different extension lengths can be replaced. The axial travel of the armature assembly 8 can also be adjusted. The shorter the axial travel, the faster the response time, and finally the response time adjustment is achieved.

[0029] The specific working process is as follows: the oil inlet P of the valve body is connected to high-pressure oil, and the oil outlet T is connected to low-pressure oil. As a result, a pressure difference is generated between the oil inlet P and the oil outlet T. After the coil assembly 7 is energized, an electromagnetic field is generated, which causes the armature stop seat 4 and the armature assembly 8 to generate electromagnetic force. Since a certain gap is designed between the two, the electromagnetic force will overcome the spring force of the armature spring 12, causing the armature assembly 8 to move to the end. The armature assembly 8 separates from the nozzle 5, and the small hole of the nozzle 5 is opened. Through the through hole of the nozzle 5, the cavity at the end of the main valve core 6 is connected to the low-pressure cavity. At this time, the cavity at the beginning of the main valve core 6 is connected to high pressure, which causes the high-pressure oil to overcome the spring force of the main valve spring 11 and push the main valve core 6 to move to the end. The main valve core 6 separates from the main valve stop seat 3, and the end opening of the main valve stop seat 3 is opened. The high-pressure oil will flow in from the oil inlet P and flow out from the oil outlet T, achieving the function of opening the pilot valve.

[0030] Conversely, when the coil assembly 7 is de-energized, the armature assembly 8 moves towards the head end under the spring force of the armature spring 12, blocking the small hole of the nozzle 5. High-pressure oil enters the cavity at the end of the main valve core 6 through the through hole of the main valve core 6, making the pressure at the end of the main valve core 6 greater than the pressure at the head end of the main valve core 6, thereby pushing the main valve core 6 towards the head end. At the same time, under the combined action of the spring force of the main valve spring 11, the main valve core 6 and the main valve stop seat 3 are completely closed, thus disconnecting the oil inlet P from the oil outlet T, and the pilot valve achieves the function of closing.

[0031] During use, the outlet flow rate is adjusted by adjusting the position of the main valve stop seat 3, and the axial travel of the armature assembly 8 is adjusted by adjusting the thickness adjustment shim 9, thereby adjusting the response time. This achieves low energy consumption, fast response time, and a wide range of valve port flow rates, with the adjustment of response time and flow range not affecting each other.

[0032] Prioritize that, in order to achieve a pressure at the end of the main valve core 6 that is greater than the pressure at the beginning of the main valve core 6, the force-bearing area at the beginning of the main valve core 6 needs to be smaller than the force-bearing area at the end. Simultaneously, a damping adjustment screw 10 is installed in the axial through-hole of the main valve core 6. The damping adjustment screw 10 can adjust the damping value of the damping orifice, thereby adjusting the pressure difference between the two ends of the main valve core 6. The damping orifice formed between the damping adjustment screw 10 and the main valve core 6 allows high-pressure oil from the left inlet P of the main valve bushing 1 to flow into the right cavity of the main valve bushing 1, ultimately making the hydraulic pressure at both ends of the main valve core 6 the same. At this point, due to the difference in force-bearing area, the main valve core 6 moves towards the beginning.

[0033] In the pilot-operated solenoid valve provided in the specific embodiment of the present invention, the main valve core 6 has multiple annular grooves arranged sequentially along the axial direction on its outer periphery, which makes the force on the main valve core 6 more balanced and improves the stability and reliability of the equipment. Furthermore, a filter screen 14 is provided at the oil inlet P, and an opening for the lead wire 15 to pass through is provided on the side of the outer casing 2.

[0034] The end of the main valve bushing 1 extends into the opening at the beginning of the housing 2. A guide sleeve 13 is fixedly installed inside the housing 2, pressing against the nozzle 5. The beginning of the armature assembly 8 passes through the guide sleeve 13 and is aligned with the nozzle 5. Specifically, the main valve bushing 1 is welded to or press-fitted to the housing 2, and the guide sleeve 13 is threaded to the inner wall of the housing 2. The connection method of each component can also be adjusted according to the situation, all of which are within the protection scope of this invention.

[0035] Based on the pilot-operated solenoid valve provided in the above specific embodiments, the main valve bushing 1 has an internal thread in the opening at the first end, and the main valve stop seat 3 has an external thread on its outer periphery. The two are threadedly connected and generate axial displacement by rotation, thereby controlling the opening degree of the oil outlet T.

[0036] The pilot-operated solenoid valve provided by this invention has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the embodiments above are merely for the purpose of helping to understand the method and core ideas of this invention. It should be noted that those skilled in the art can make various improvements and modifications to this invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of this invention.

Claims

1. A pilot operated solenoid valve characterized by, The main valve sleeve (1) and the shell (2) are provided with the main valve seat (3) installed in the first end opening of the main valve sleeve (1), the oil outlet (T) arranged in the middle of the side wall of the main valve sleeve (1), and the last end opening of the main valve sleeve (1) communicated with the first end opening of the shell (2), the armature seat (4) arranged at the last end opening of the shell (2), the main valve seat (3) can move axially in the main valve sleeve (1) to adjust the area of the last end of the main valve seat (3) shielding the oil outlet (T), the nozzle (5) is installed at the last end of the main valve sleeve (1), the main valve core (6) is arranged between the main valve seat (3) and the nozzle (5), the first end opening of the main valve seat (3) is the oil inlet (P), the last end opening of the main valve seat (3) is communicated with the first end opening of the nozzle (5) through the axial through hole of the main valve core (6), the main valve core (6) can move axially in the main valve sleeve (1) by the change of hydraulic pressure to close or open the last end opening of the main valve seat (3), the coil assembly (7) and the armature assembly (8) are installed in the shell (2), the armature assembly (8) can move axially to close or open the last end opening of the nozzle (5), the thickness adjusting gasket (9) is arranged between the last end of the armature assembly (8) and the armature seat (4) to adjust the axial stroke of the armature assembly (8); The force receiving area of the first end of the main valve core (6) is smaller than that of the last end, and the damping adjusting screw (10) is arranged in the axial through hole of the main valve core (6) to adjust the pressure difference between the two ends of the main valve core (6).

2. The pilot operated solenoid valve according to claim 1, characterized by The main valve spring (11) is arranged between the main valve core (6) and the nozzle (5).

3. The pilot operated solenoid valve according to claim 2, characterized in that The main valve core (6) is provided with a plurality of annular grooves arranged in sequence along the axial direction.

4. The pilot operated solenoid valve according to claim 1, characterized by The armature spring (12) is arranged between the armature assembly (8) and the armature seat (4).

5. The pilot operated solenoid valve according to claim 4, characterized in that The armature spring (12) and the armature seat (4) are detachably connected with the shell (2) to replace the armature spring (12) with different elasticity and / or the armature seat (4) with different extension length.

6. The pilot operated solenoid valve according to claim 1, wherein The last end of the main valve sleeve (1) extends into the first end opening of the shell (2), the guide sleeve (13) is fixedly installed in the shell (2), the guide sleeve (13) abuts against the nozzle (5), and the first end of the armature assembly (8) penetrates through the guide sleeve (13) and is aligned with the nozzle (5).

7. The pilot operated solenoid valve according to claim 6, characterized in that The main valve sleeve (1) and the shell (2) are welded or interference fit, and the guide sleeve (13) is threadedly connected with the inner wall of the shell (2).

8. The pilot operated solenoid valve according to claim 7, characterized in that The filter screen (14) is arranged at the oil inlet (P), and the shell (2) is provided with an opening through which the lead-out wire (15) penetrates.

9. The pilot operated solenoid valve according to any one of claims 1 to 8, characterized in that The first end opening of the main valve sleeve (1) is provided with an internal thread, and the outer periphery of the main valve seat (3) is provided with an external thread, which are threadedly connected and axially displaced by rotation.

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