Two-position three-way electromagnetic valve adopting lever structure

Abstract

The invention relates to the technical field of electromagnetic valves, in particular to a two-position three-way electromagnetic valve adopting a lever structure, which comprises a valve body and a valve core which is arranged in the valve body and is used for controlling the on-off of fluid, an electromagnetic component is arranged above the valve body, and a single-stage lever type force transmission amplifying mechanism is arranged in a radial space between the valve core and the electromagnetic component. The lever is rotationally arranged in the protective shell through a pin, a power arm of the lever is rotationally connected with the armature output end of the electromagnetic assembly, and a resisting arm is rotationally connected with the valve element. By means of the lever principle, small armature attraction force of the electromagnet can be amplified and transmitted to the valve element, so that strong driving force capable of overcoming large-flow fluid resistance is provided for the valve element on the premise that the size and power consumption of the electromagnet do not need to be greatly increased, and efficient driving of the large-flow valve element through the small-size and light-weight electromagnet is achieved. The device is especially suitable for the fields of aerospace and the like which have strict requirements on light weight, high reliability and large flow control of equipment.

Description

Technical Field

[0001] This invention relates to the field of solenoid valve technology, and in particular to a two-position three-way solenoid valve employing a lever structure. Background Technology

[0002] Electromagnetic cartridge directional control valves are directional control valves with two or more flow patterns and two or more ports, and are easy to integrate. In aerospace and other fields, the working environment is often extremely harsh, placing extremely stringent requirements on the reliability, power density, and response speed of solenoid valves. Under high flow conditions, the valve core is affected by the increased static and dynamic pressure of the medium and the increased fluid viscous resistance. To achieve rapid valve response and precise control, a larger drive assembly is often required, increasing the driving force of the drive assembly and the spring force of the return spring, thereby enabling the drive assembly to output a large flow rate. However, a drive assembly with a larger driving force will have a larger volume, and the heat dissipation and energy consumption of the electromagnetic structure will also be higher.

[0003] Based on the above-mentioned technical problems, the present invention proposes a two-position three-way solenoid valve with a lever structure. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings of the prior art and provide a two-position three-way solenoid valve with a lever structure to solve the above-mentioned technical problems.

[0005] The present invention is achieved through the following technical solution: a two-position three-way solenoid valve with a lever structure, including a valve body and a valve core disposed inside the valve body to control the flow of fluid. A drive assembly is disposed above the valve body. The drive assembly includes a protective shell, a front stop, and an electromagnetic assembly. A front stop is fixedly disposed at the top of the valve body. A protective shell is fixedly disposed at the top of the front stop. A chamber for accommodating the electromagnetic assembly is formed between the protective shell and the front stop. A force amplification mechanism for driving the valve core to move is disposed in the radial space between the valve core and the electromagnetic assembly. The force amplification mechanism is a single-stage lever. The lever is rotatably mounted inside the protective shell via a pin. The power arm of the lever is rotatably connected to the output end of the electromagnetic component, and the resistance arm of the lever is rotatably connected to the valve core. The length ratio of the power arm to the resistance arm of the lever is 2:1.

[0006] Furthermore, the lever is provided with connecting posts at both ends for connecting the electromagnetic component and the valve core.

[0007] Furthermore, the top of the valve core is provided with a semi-circular groove for connecting the lever, the inner diameter of the groove is equal to the outer diameter of the connecting column, and the valve core is rotatably connected to the connecting column through the groove.

[0008] Furthermore, the valve core is provided with a sealing groove, and a sealing device is provided in the sealing groove. The sealing device includes a sealing ring, and a retaining ring is provided on the top of the sealing ring to prevent deformation of the sealing ring.

[0009] Furthermore, the front stop has two layers, the upper layer is the stop end face, and the bottom is the receiving cavity. The stop end face is provided with a mounting hole, and the receiving cavity is provided with a slide rail for limiting the valve body. The slide rail is provided on the side wall of the receiving cavity, and a limiting step is provided directly below the mounting hole. The limiting step is fixedly provided on the bottom wall of the receiving cavity.

[0010] Furthermore, the electromagnetic component includes an armature slidably disposed in a mounting hole, the armature being rotatably connected to a lever, the bottom of the armature being provided with a semi-circular groove for connecting the lever, the top of the armature being configured as a frustum with a cone angle of 45 degrees, and the top of the armature also having a blind hole for installing a return spring.

[0011] Furthermore, a rear stop is provided at the top of the armature, and a groove matching the frustum of the armature is provided at the bottom of the rear stop, and a blind hole for installing a return spring is also provided at the center of the groove.

[0012] Furthermore, a magnetic shielding ring is provided between the rear stop and the front stop, and the two ends of the magnetic shielding ring are fixedly connected to the rear stop and the front stop.

[0013] Furthermore, a coil and electromagnet isolation ring are fixedly provided on the outer side of the magnetic shielding ring and the rear stop iron.

[0014] Furthermore, a protective shell is provided on the outside of the entire electromagnetic assembly, and the protective shell is fixedly connected to the front stop.

[0015] The beneficial effects of this invention are as follows: A two-position three-way solenoid valve with a lever structure includes a valve body and a valve core disposed inside the valve body to control the flow of fluid. A drive assembly is disposed above the valve body. The drive assembly includes a protective shell, a front stop, and an electromagnetic component. The front stop is fixedly disposed at the top of the valve body, and the protective shell is fixedly disposed on top of the front stop. A chamber for accommodating the electromagnetic component is formed between the protective shell and the front stop. A force amplification mechanism for driving the movement of the valve core is disposed in the radial space between the valve core and the electromagnetic component. The force amplification mechanism is a single-stage lever. The lever is rotatably disposed inside the protective shell by a pin. The power arm of the lever is rotatably connected to the output end of the electromagnetic component, and the resistance arm of the lever is rotatably connected to the valve core. The lever structure converts the linear attraction motion of the electromagnet armature into driving the valve core. By utilizing the mechanical principle that the length of the power arm is greater than that of the resistance arm, the output force is effectively amplified. Conversely, when the electromagnet is de-energized, the lever structure can self-lock the valve core to prevent excessive fluid pressure from causing the valve core to move unexpectedly, thereby ensuring the reliable sealing performance of the solenoid valve in the de-energized state. This significantly enhances the safety and stability of the solenoid valve during operation. It eliminates the need to excessively increase the size and power of the electromagnet when driving high-flow valve cores, successfully achieving the goal of driving high-flow valves with a small, lightweight electromagnet. Thanks to force amplification, the valve core can obtain greater driving force, effectively overcoming fluid resistance and interference under high-flow conditions, ensuring rapid response and precise control. Simultaneously, the lever, valve core, and armature are connected by a rotating mechanism with line contact, resulting in low frictional resistance, high transmission efficiency, and low power loss. Without increasing system complexity, this significantly improves the power density and reliability of the solenoid valve, especially meeting the stringent requirements of aerospace and other fields for lightweight, high-flow, and highly reliable solenoid valves. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of a solenoid valve structure. Figure 2 This is a cross-sectional view of a solenoid valve. Figure 3 This is a schematic diagram of the front stop structure; Figure 4 This is a schematic diagram of the armature structure; Figure 5 This is a schematic diagram of the rear stop structure.

[0017] In the diagram: 1. Valve body; 11. Valve core; 12. Retaining ring; 13. Sealing ring; 2. Drive assembly; 21. Protective shell; 22. Armature; 23. Spring; 24. Rear stop; 3. Piezoelectric film sensor; 4. Coil; 41. Electromagnetic isolation ring; 42. Magnetic isolation ring; 5. Lever; 51. Pin; 52. Power arm; 53. Resistance arm; 6. Front stop; 61. Mounting hole; 62. Support base; 63. Slide rail. Detailed Implementation

[0018] In the description of this invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0019] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0020] Example 1 like Figure 1-3 As shown, this embodiment discloses a two-position three-way solenoid valve with a lever structure, including a valve body 1 and a valve core 11 installed inside the valve body 1 to control the flow of fluid. A drive assembly 2 is installed above the valve body 1. The drive assembly 2 includes a front stop 6, an electromagnetic component, and a protective shell 21. The valve body 1 is fixedly installed at the bottom of the front stop 6, and the protective shell 21 is fixedly installed at the top of the front stop 6. A chamber for installing the electromagnetic component is formed between the protective shell 21 and the front stop 6. A force amplification mechanism for driving the valve core 11 to move is installed in the radial space between the valve core 11 and the electromagnetic component. The force amplification mechanism is a single-stage lever, i.e., lever 5.

[0021] The valve core 11 is slidably installed in the valve body 1. A sealing groove is provided on the valve core 11, and a sealing ring 13 and a retaining ring 12 are installed in the sealing groove. The sealing ring 13 is an O-ring made of fluororubber. The sealing ring 13 is installed in the sealing groove of the valve core to prevent the working medium from leaking to the lever structure and causing external leakage. It is used for radial sealing of the valve core. The retaining ring 12 is made of polyamide. The retaining ring 12 is installed above the sealing ring 13 to provide support for the sealing ring 13 and prevent the sealing ring 13 from being squeezed into the sealing gap and broken under high pressure, which would cause sealing failure.

[0022] An overflow groove is provided at the bottom of the valve core 11 to prevent the formation of a closed cavity between the valve core 11 and the valve body 1, which would affect the axial movement of the valve core 11. Furthermore, a semi-circular connecting groove is provided at the top of the valve core 11, and a force transmission amplification mechanism is installed in the connecting groove for axial movement of the valve core, thereby realizing the functional conversion of the drive assembly 2.

[0023] The front stop 6 consists of two layers: an upper stop face and a lower receiving cavity. A mounting hole 61 is located at the center of the stop face for mounting the electromagnetic component. A support base 62 for mounting the force amplification mechanism is located on the lower end face of the stop face. A slide rail 63 is mounted on the inner wall of the receiving cavity, through which the valve body 1 is mounted. A groove is machined at the end of the valve body 1, which limits its movement when installed with the slide rail 63. The cooperation between the slide rail 63 and the groove at the top of the valve body 1 allows the valve body 1 to slide smoothly along the slide rail 63 when connected to the front stop 6, enhancing connection stability and ensuring the accuracy of the solenoid valve during operation. After the valve body 1 and the front stop 6 are installed, the contact area between them is fixed by laser welding. Meanwhile, a limiting step is provided on the bottom wall of the receiving cavity of the front stop 6 to limit the downward movement of the armature 22, which determines the extreme position of the downward movement of the armature 22. At the same time, a piezoelectric thin film sensor 3 is installed on the limiting step to detect whether the armature 22 has been reset in place, and thus determine whether the solenoid valve has been reset in place.

[0024] like Figure 2-3 As shown, lever 5 is rotatably mounted on support seat 62 inside the front stop 6 cavity via pin 51; lever 5 is divided into power arm 52 and resistance arm 53, with a ratio of 2:1 between power arm 52 and resistance arm 53. According to the lever balance condition, the product of power and power arm 52 is equal to the product of resistance and resistance arm 53. The length of lever power arm 52 is twice that of resistance arm 53, and the driving force acting on the valve core is twice that of the valve core driving force of the traditional drive assembly under the same driving force conditions. Furthermore, this electromagnet structure is smaller and lighter, and the drive assembly with lever structure is easy to miniaturize.

[0025] Connecting columns are welded to the ends of the power arm 52 and the resistance arm 53. The outer diameter of the connecting column is equal to the inner diameter of the semi-circular connecting groove at the top of the valve core 11. The connecting column of the resistance arm 53 is rotatably installed in the connecting groove at the top of the valve body 1. The lever 5 is in line contact with the valve core 11 and the armature 22, resulting in low rotational resistance and low power loss.

[0026] The electromagnetic assembly includes an armature 22, a spring 23, a magnetic shielding ring 42, a coil 4, an electromagnet isolation ring 41, a rear stop 24, and a protective shell 21. The armature 22 is slidably installed in the mounting hole 61. A semi-circular connecting groove, identical in diameter to the outer diameter of the connecting post, is formed at the bottom of the armature 22, allowing it to be rotatably connected to the power arm 52. The top of the armature 22 is frustum-shaped, and the rear stop 24 is installed above and in conjunction with the armature 22. In cross-section, the cone angle of the frustum at the top of the armature 22 is 45 degrees, designed to increase the magnetic flux area and thus the electromagnet's attraction force. Countersunk holes are formed at the center of the top of the armature 22 and the bottom of the rear stop 24 for mounting the spring 23.

[0027] A magnetic shielding ring 42 is installed between the rear guard 24 and the front guard 6. The two ends of the magnetic shielding ring 42 are welded to the rear guard 24 and the front guard 6 respectively. A coil 4 is installed on the outside of the magnetic shielding ring 42 and the rear guard 24. An electromagnet isolation ring 41 is fixedly installed on the outside of the coil 4. The electromagnet isolation ring 41 is made of soft magnetic alloy. After the coil 4 is energized, the electromagnet isolation ring 41 forms a closed magnetic field line with the front guard 6, the rear guard 24 and the armature 22.

[0028] The outer side of the electromagnet isolation ring 41 is also wrapped with a protective shell 21 to prevent the electromagnet from being interfered with or damaged by the external environment during operation. The protective shell 21 is fixedly connected to the front stop 6 by bolts. At the same time, the protective shell 21 is also provided with a wire hole for threading the electromagnet wire.

[0029] The force amplification mechanism is a lever 5, which is rotatably mounted in the protective shell 21 via a pin 51. The power arm 52 is rotatably connected to the output end of the electromagnetic component, and the resistance arm 53 is rotatably connected to the valve core 11.

[0030] A two-position three-way solenoid valve employing a lever structure operates by energizing the electromagnet. At this time, the electromagnet's isolating ring 41, the front stop 6, the rear stop 24, and the armature 22 form a closed magnetic field. Under the electromagnetic force, the armature 22 moves along the axial direction. During its upward movement, the armature 22 drives the valve core 11 to move downward along the axial direction via the lever structure. After the solenoid valve is de-energized, the armature 22 moves downward along the axial direction under the force of the return spring. When the armature 22 reaches its limit position, its bottom end contacts the limiting step of the front stop 6. Simultaneously, a piezoelectric thin-film sensor mounted on the limiting step detects in real time whether the armature has returned to its original position, thus realizing the solenoid valve's reset detection function. The movement of the armature 22 causes the power arm 52 of the lever 5 to rotate. Since the lever 5 rotates around the pin 51, according to the lever principle, the rotation of the power arm 52 causes the resistance arm 53 to rotate in the opposite direction, thereby driving the valve core 11 to move, realizing the reversing function of the two-position three-way solenoid valve and controlling the flow and direction of fluid. Furthermore, when the electromagnet is energized, the electromagnetic force acting on the valve core 11 through lever 5 is amplified by two times. Similarly, when the electromagnet is de-energized, the force exerted by the fluid on the valve core 11 in the reverse direction is reduced to half of its original value through lever 5. This not only effectively reduces the driving power requirement of the electromagnet, making the entire solenoid valve system more energy-efficient, but also enhances the stability of the valve core 11 under fluid action, reducing malfunctions of the valve core 11 caused by fluid pressure fluctuations, and improving the reliability and service life of the solenoid valve. Moreover, by adjusting the ratio and position of the lever, the directional force and stroke of the solenoid valve can be flexibly changed to meet the needs of different application scenarios.

[0031] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A two-position three-way solenoid valve employing a lever structure, comprising a valve body and a valve core disposed inside the valve body for controlling the flow on / off, characterized in that, A drive assembly is provided above the valve body. The drive assembly includes a protective shell, a front stop, and an electromagnetic assembly. A front stop is fixedly provided at the top of the valve body. A protective shell is fixedly provided on the top of the front stop. A chamber for accommodating the electromagnetic assembly is formed between the protective shell and the front stop. A force amplification mechanism for driving the valve core to move is provided in the radial space between the valve core and the electromagnetic assembly. The force amplification mechanism is a single-stage lever. The lever is rotatably mounted inside the protective shell via a pin. The power arm of the lever is rotatably connected to the output end of the electromagnetic component, and the resistance arm of the lever is rotatably connected to the valve core. The length ratio of the power arm to the resistance arm of the lever is 2:

1.

2. A two-position three-way solenoid valve with a lever structure according to claim 1, characterized in that, The lever has connecting posts at both ends for connecting the electromagnetic component and the valve core.

3. A two-position three-way solenoid valve with a lever structure according to claim 1, characterized in that, The valve core is provided with a semi-circular connecting groove for connecting lever at its top end. The inner diameter of the semi-circular connecting groove is equal to the outer diameter of the connecting column. The valve core is rotatably connected to the connecting column through the groove.

4. A two-position three-way solenoid valve with a lever structure according to claim 1, characterized in that, The valve core is provided with a sealing groove, and a sealing device is provided in the sealing groove. The sealing device includes a sealing ring, and a retaining ring is provided on the top of the sealing ring to prevent deformation of the sealing ring.

5. A two-position three-way solenoid valve with a lever structure according to claim 1, characterized in that, The front stop has two layers, the upper layer is the end face of the stop, and the bottom is the receiving cavity. The end face of the stop is provided with a mounting hole. The receiving cavity is provided with a slide rail for limiting the valve body. The slide rail is provided on the side wall of the receiving cavity. A limiting step is provided directly below the mounting hole. The limiting step is fixedly provided on the bottom wall of the receiving cavity.

6. A two-position three-way solenoid valve with a lever structure according to claim 1, characterized in that, The electromagnetic component includes an armature that is slidably disposed in a mounting hole. The armature is rotatably connected to a lever. The bottom of the armature is provided with a semi-circular connecting groove for connecting the lever. The top of the armature is shaped like a frustum with a cone angle of 45 degrees. The top of the armature is also provided with a blind hole for installing a return spring.

7. A two-position three-way solenoid valve with a lever structure according to claim 7, characterized in that, The armature is provided with a rear stop at the top, and the rear stop is provided with a groove at the bottom that matches the armature truncated cone. A blind hole for installing a return spring is also provided at the center of the groove.

8. A two-position three-way solenoid valve with a lever structure according to claim 8, characterized in that, A magnetic shielding ring is provided between the rear stop and the front stop, and the two ends of the magnetic shielding ring are fixedly connected to the rear stop and the front stop.

9. A two-position three-way solenoid valve with a lever structure according to claim 9, characterized in that, The magnetic shielding ring and the outer side of the rear stop are fixedly provided with a coil and an electromagnet isolation ring.

10. A two-position three-way solenoid valve with a lever structure according to claim 1, characterized in that, The entire electromagnetic assembly is provided with a protective shell on the outside, and the protective shell is fixedly connected to the front stop.

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