Servo valve based on magnetic attraction

Abstract

The utility model discloses a servo valve based on magnetic attraction, and belongs to the technical field of servo valves, the servo valve based on magnetic attraction comprises a valve body and a valve core, the valve body is provided with a valve cavity, the valve core is arranged in the valve cavity, and the valve core can move relative to the valve body in the axial direction of the valve core; the driving assembly is used for driving the valve element to move and provided with a rotor in transmission connection with the valve element, and the rotor and the valve element are combined and marked as a transmission part; and the magnetic assembly comprises a plurality of magnetic unit pieces, part of the unit pieces are arranged on the valve body, the rest of the unit pieces are arranged on the transmission part, and part of the unit pieces and the rest of the unit pieces are opposite in position and spaced, so that after power failure, the valve element and the valve body can move relatively through magnetic force among the unit pieces till the valve element returns to the preset position. The valve element can automatically recover to the expected position after power failure, the situation that the system is out of control due to the fact that the output position of the servo valve is uncontrollable is prevented, then the stability of the servo valve system is improved, it is ensured that accurate control can be achieved under various conditions, and the requirements of different scenes are met.

Description

Technical Field

[0001] This application belongs to the field of servo valve technology, and in particular relates to a servo valve based on magnetic attraction. Background Technology

[0002] Servo valves, as core control components within hydraulic systems, play an indispensable role in numerous fields such as aerospace exploration, construction machinery operations, and industrial automation processes. Their core function lies in adjusting the flow of hydraulic media based on received control commands, thereby achieving precise control over force and position. In the face of varied and demanding working environments, the performance of the servo valve is crucial to the stable operation and precise control of the entire servo valve system.

[0003] In traditionally designed servo valves, the output position often becomes uncontrollable when power is lost. Normally, servo valves rely on electricity to drive and execute actions based on input signals; however, once power is interrupted, the valve spool's output position often becomes unpredictable and uncontrollable, failing to autonomously return to its initial set position. This can potentially threaten the safety of the hydraulic system and the equipment's protection mechanisms. Utility Model Content

[0004] This application aims to at least partially solve the technical problem of uncontrollable output position of servo valve after power failure. To this end, this application provides a magnetically attracted servo valve that can automatically return to the expected position after power failure, preventing system loss of control due to uncontrollable output position of servo valve, thereby improving the stability of servo valve system, ensuring precise control under various conditions, and adapting to the needs of different scenarios.

[0005] This application provides a magnetically-based servo valve, which includes:

[0006] The valve body and valve core are provided. The valve body has a valve cavity, and the valve core is located in the valve cavity. The valve core is movable relative to the valve body along its own axis.

[0007] A drive assembly is used to drive the valve core to move. The drive assembly is equipped with a rotor that is connected to the valve core for transmission. The combination of the rotor and the valve core is referred to as the transmission unit.

[0008] The magnetic component includes multiple magnetic units. Some units are located in the valve body, and the remaining units are located in the transmission part. The positions of some units and the remaining units are opposite and spaced apart, so that after power is cut off, the valve core and the valve body can move relative to each other through the magnetic force between the multiple units until the valve core returns to the preset position along its own axis.

[0009] In some embodiments, the magnetic component includes a first magnetic element, a second magnetic element, and a third magnetic element, with the first and second magnetic elements positioned relative to each other on the valve body, and the third magnetic element located at a spaced-apart position between the first and second magnetic elements.

[0010] In some embodiments, the third magnetic element is fixedly connected to the rotor; or the third magnetic element is fixedly connected to the valve core.

[0011] In some embodiments, the polarities of the opposite ends of the first magnetic element and the second magnetic element are opposite, and the third magnetic element is disposed on the rotor; or the third magnetic element is disposed on the valve core, and the polarities of the ends of the third magnetic element are respectively opposite to the polarities of the opposite ends.

[0012] In some embodiments, the first magnetic element, the second magnetic element, and the third magnetic element are all permanent magnets with regular shapes.

[0013] In some embodiments, the first magnetic element, the second magnetic element, and the third magnetic element are a set of unit components, and the valve body, valve core, or drive assembly is provided with multiple sets of unit components.

[0014] In some embodiments, the valve core has a circumferential protrusion, and the valve body has a flow channel for communicating with the valve cavity. The protrusion is movable relative to the flow channel to connect or disconnect the valve cavity from the flow channel.

[0015] In some implementations, the preset position is the corresponding position where the protrusion and the flow channel cooperate.

[0016] In some embodiments, the valve body includes a main valve body having a valve cavity inside, and an end cap for closing the valve cavity, the end cap being detachably connected to the main valve body.

[0017] In some embodiments, the valve body further includes a valve sleeve, which is embedded and fixed within the valve body. The valve sleeve accommodates the valve core and moves relative to it on its inner side, so that the flow channel is connected to or disconnected from the valve cavity.

[0018] As can be seen from the above technical solution, the beneficial effects of this application are as follows:

[0019] This application combines a magnetic component with the valve body, valve core, or drive component, providing magnetic force between the valve body and the movable valve core / drive component. With some units located in the valve body and the remaining units in the valve core or drive component, the valve core is no longer driven after power failure. However, the valve core and drive component are mutually driven, and the valve core or drive component interacts with the valve body under the magnetic force of the unit components. This makes the axial magnetic force component between the valve core and valve body zero, or the torque output by the rotor of the valve core drive component on the valve core zero. The valve core then moves and eventually reaches a preset position. In the event of an unexpected power failure in the hydraulic system, the servo valve can quickly return to the preset position, preventing dangerous situations such as mechanical equipment malfunction or the inability to stop the hydraulic cylinder. This greatly reduces the risk of safety accidents caused by servo valve malfunctions, thereby improving the stability of the servo valve system and ensuring precise control under various conditions to meet the needs of different scenarios. Simultaneously, it ensures personnel safety and equipment integrity, and reduces maintenance costs. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced one by one below. Obviously, the accompanying drawings described below are some embodiments of this application. For those skilled in the art, other embodiments and drawings can be obtained based on these drawings without creative effort. Various schematic diagrams according to the embodiments of this application are shown in the accompanying drawings. These drawings are not necessarily drawn to scale. For the purpose of clarity, some details have been enlarged and some details may have been omitted.

[0021] Figure 1 A schematic diagram of an embodiment of the magnetically-assisted servo valve of this invention is shown;

[0022] Figure 2 The diagram shows a disassembled view of the valve body and drive assembly in Embodiment 2 of the magnetically-assisted servo valve of this invention.

[0023] Figure 3 A schematic diagram of the arrangement of the magnetic component of this utility model in Embodiment 2 is shown;

[0024] Figure 4 A schematic diagram of Embodiment 3 of the magnetically-assisted servo valve of this utility model is shown;

[0025] Figure 5 A schematic diagram of the arrangement of the magnetic component of this utility model in Embodiment 4 is shown;

[0026] Reference numerals: 100, servo valve; 110, valve body; 111, flow channel; 112, valve chamber; 113, main valve body; 114, end cap; 115, valve sleeve; 120, valve core; 121, protrusion; 130, magnetic assembly; 131, first magnetic element; 132, second magnetic element; 133, third magnetic element; 140, drive assembly; 141, rotor. Detailed Implementation

[0027] The technical solutions in the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. The detailed description of the embodiments of this application provided in the drawings is not intended to limit the scope of the claimed application. The described embodiments are only a part of the embodiments of this application, not all of them. Based on the embodiments in this application, they can be arranged and designed in various different configurations. All other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0028] This application is described below with reference to the accompanying drawings and specific embodiments:

[0029] Please refer to Figure 1This application provides a magnetically-based servo valve 100, which includes a valve body 110, a valve core 120, a drive assembly 140, and a magnetic assembly 130. The valve body 110 and valve core 120 are conventional components of an electro-hydraulic servo valve, such as an electric, electro-hydraulic, or pneumatic type. The valve body 110 has a valve cavity 112, which is closed relative to the outside, only providing fluid inlet and outlet, and mounting port for the drive assembly 140. The valve core 120 is located within the valve cavity 112 and is movable relative to the valve body 110 along its own axial direction. The valve core 120 moves along its axial direction within the valve cavity 112. The valve body 110 has a flow channel 111 communicating with the valve cavity 112. By adjusting the relative movement of the valve core 120 and the valve body 110, a portion of the valve core 120 can close or open part of the flow channel 111, thereby controlling the flow direction of the fluid within the flow channel 111. The drive assembly 140 is used to drive the valve core 120 to move. The drive assembly 140 is provided with a rotor 141 that is driven by the valve core 120. The transmission between the rotor 141 and the valve core 120 is the prior art. If the drive assembly 140 is a motor, the end of the motor rotor 141 is directly connected to one end of the valve core 120 and directly drives the valve core 120 to move. Alternatively, the middle part of the rotor 141 can be inserted into the eccentric position of the end of the valve core 120 and set vertically. In this way, the rotor 141 drives the valve core 120 to move by rotation. The combination of the rotor 141 and the valve core 120 is called the transmission part. The valve body 110 is provided with a mounting port. The drive assembly 140 is installed at the mounting port, and the rotor 141 of the drive assembly 140 is driven by the valve core 120. The drive assembly 140 can be a motor. The drive assembly 140 drives the valve core 120 to move axially to work, which is the prior art, such as a direct-drive electro-hydraulic servo valve.

[0030] The magnetic component 130 includes multiple magnetic units. The number of units can be determined according to the requirements of the setting position and the magnitude of the magnetic force. Some units are located on the valve body 110, and the remaining units are located on the transmission part, that is, the remaining units are located on the valve core 120 or on the rotor 141 of the drive component 140. If the unit component uses a block-shaped permanent magnet, the inner wall of the valve body 110 and the corresponding position on the valve core 120 are provided with openings or holes for embedding the permanent magnet. After the permanent magnet is inserted, the valve body 110 and the valve core 120 can be restored to a position where they no longer move relative to each other through magnetic attraction. This position is called the preset position and can be set in advance. The preset position can be the initial position or the zero point position. Alternatively, the inner wall of the valve body 110 adjacent to the drive assembly 140 and the rotor 141 of the drive assembly 140 are provided with openings or holes for embedding permanent magnets, and the opening positions are corresponding. After the permanent magnet is inserted, the rotor 141 and the valve body 110 can be restored to their rotation angle and position through magnetic attraction. During the process of the rotor 141 restoring its position, it will drive the valve core 120 to move along its own axis, so the valve core 120 also restores its position synchronously. Some unit components are positioned relative to and spaced apart from the remaining unit components. The size of the gap must ensure that different unit components generate a movable force so that after power is cut off, the valve core 120 and the valve body 110 can move relative to each other through the magnetic force between multiple unit components until the valve core 120 returns to the preset position along its own axis.

[0031] In existing servo valves, the output position often becomes uncontrollable when power is lost. Normally, servo valves rely on electricity for actuation, executing actions based on input signals. However, once power is interrupted, the valve core output position often becomes unpredictable and uncontrollable, failing to autonomously return to its initial set position. This can pose a potential threat to the safety of the hydraulic system and the equipment's protection mechanisms. This application addresses this by combining a magnetic component 130 with the valve body 110, valve core 120, or drive component 140. Magnetic force is provided between the valve body 110 and the movable valve core 120 or drive component 140. With some units located in the valve body 110 and the remaining units in the valve core 120 or drive component 140, after power loss, the valve core 120 is no longer subject to driving force or the liquid pressure within the valve chamber 112. The valve core 120 and drive component 140 are mutually driven, and the valve core 120 or drive component 140 exerts an interaction force with the valve body 110 under the magnetic force of the unit components, causing the valve core 120 and valve body 110 to... When the magnetic force component in the axial direction of the valve core 120 is zero, or when the torque output by the rotor of the valve core drive assembly 140 to the valve core 120 is zero, the valve core 120 moves and eventually moves to the preset position. In the event of an unexpected power failure in the hydraulic system, the servo valve 100 can quickly return to the preset position, preventing dangerous situations such as mechanical equipment malfunction or the inability to stop the movement of the hydraulic cylinder. This greatly reduces the risk of safety accidents caused by abnormalities in the servo valve 100, thereby improving the stability of the servo valve 100 system and ensuring precise control under various conditions to meet the needs of different scenarios. At the same time, it ensures personnel safety and equipment integrity, and reduces maintenance costs.

[0032] In some embodiments, the magnetic assembly 130 includes a first magnetic element 131, a second magnetic element 132, and a third magnetic element 133. The first magnetic element 131 and the second magnetic element 132 are positioned relative to each other on the valve body 110. For example, two magnets are fixed to the inner wall of the valve body 110, located on opposite sides of the valve core 120. The first magnetic element 131 and the second magnetic element 132 can be embedded in the inner wall, bonded, or fixed in other ways. The third magnetic element 133 is located at a gap between the first magnetic element 131 and the second magnetic element 132. For example, the third magnetic element 133 may be block-shaped and... The valve core 120 is fixed in the hole. The third magnetic element 133 can interact with the first magnetic element 131 and the second magnetic element 132. The magnetic properties of the opposite ends of the third magnetic element 133 and the first magnetic element 131 and the second magnetic element 132 are opposite. Since the valve core 120 moves along its own axis, the third magnetic element 133 will return to the position between the first magnetic element 131 and the second magnetic element 132 under the action of magnetic attraction. Moreover, the friction between the valve core 120 and the valve body 110 of the servo valve 100 is very small, and the magnetic attraction is sufficient to drive the valve core 120 back to the preset position.

[0033] Please refer to Figure 2 In some embodiments, the drive assembly 140 includes a drive body and a rotor 141. The drive body is such as the body structure of a motor, and the rotor 141 is fixedly connected to the third magnetic element 133; or the valve core 120 is fixedly connected to the third magnetic element 133. There are two ways to set the third magnetic component 133. The third magnetic component 133 can be set on the rotor 141 of the drive assembly 140. For example, if the rotor 141 of the motor has a slot, the third magnetic component 133 can be embedded and fixed in the slot. In this way, no matter what angle the rotor 141 stops at after rotation, after power is cut off, the third magnetic component 133 can interact with the first magnetic component 131 and the second magnetic component 132, causing the motor rotor 141 to continue rotating and return to the position where the torque of the motor rotor 141 is zero. Simultaneously, the rotor 141 is connected to the valve core 120 via a drive mechanism. For example, the rotor 141 is connected to one end of the valve core 120, directly driving the valve core 120 to move; or the rotor 141 and valve core 120 rotate in a matching manner, driving the valve core 120 to move through rotation. This drive mechanism between the rotor 141 and valve core 120 is a common setting in existing servo valves. In this way, the valve core 120 can return to the preset position under the drive of the rotor 141. Please refer to... Figure 4 The third magnetic element 133 can also be disposed on the valve core 120. For example, the valve core 120 includes a control part that cooperates with the valve body 110 and a connecting rod part that connects to the rotor 141. The connecting rod part is rod-shaped, and the third magnetic element 133 is cylindrical and sleeved on the connecting rod part of the valve core 120. The two sides of the cylindrical part of the third magnetic element 133 facing the first magnetic element 131 and the second magnetic element 132 are of two different polarities. Both sides of the third magnetic element 133 are attracted to the first magnetic element 131 and the second magnetic element 132 by opposite polarities. In this way, the valve core 120 can be driven to return to the preset position along the axial direction under the action of magnetic attraction.

[0034] Please refer to Figure 3 and Figure 5In some embodiments, the polarities of the opposite ends of the first magnetic element 131 and the second magnetic element 132 are opposite. For example, the polarity of the end face of the first magnetic element 131 facing the third magnetic element 133 is S pole, and the polarity of the end face of the second magnetic element 132 facing the third magnetic element 133 is N pole. The third magnetic element 133 is disposed on the rotor 141, and the polarities of its two ends are N pole and S pole, respectively. The third magnetic element 133 is perpendicular to the first magnetic element 131 and the second magnetic element 132. The connection direction is as shown in the figure. The third magnetic element 133 is horizontally set with opposite polarities at both ends. Both ends of the third magnetic element 133 are spaced apart from the first magnetic element 131 and the second magnetic element 132. In this way, the third magnetic element 133 can rotate through the rotor 141. If the power is cut off, the N pole of the third magnetic element 133 is attracted by the S pole of the first magnetic element 131, and the S pole is attracted by the N pole of the second magnetic element 132, thereby rotating. At the same time, the rotor 141 drives the valve core 120 to move axially to the preset position. Alternatively, a third magnetic element 133 may be disposed on the valve core 120. The polarity of the end of the third magnetic element 133 is opposite to that of the opposite end. The polarity of the first magnetic element 131 and the second magnetic element 132 is set as described above. Only the setting of the third magnetic element 133 will be explained. The polarity of the side of the third magnetic element 133 facing the first magnetic element 131 is the N pole, and the polarity of the side of the third magnetic element 133 facing the second magnetic element 132 is the S pole. In this way, after the power is cut off, the two sides of the third magnetic element 133 are attracted by the S pole of the first magnetic element 131 and attracted by the N pole of the third magnetic element 133, respectively, and the valve core 120 moves to the preset position.

[0035] In some embodiments, the first magnetic element 131, the second magnetic element 132, and the third magnetic element 133 are all permanent magnets with regular shapes, such as cylinders, cuboids, rings, or other shapes. The shape is determined as needed. For example, in the figure, the first magnetic element 131 and the second magnetic element 132 are both cuboids, and the third magnetic element 133 is a cylinder. In another example, in the figure, the first magnetic element 131 and the second magnetic element 132 are the arc-shaped parts of the cylinder, and the arc-shaped surface corresponding to the arc is close to the inner wall of the valve body 110, while the flat surface opposite to the arc-shaped surface is opposite and parallel. The third magnetic element 133 is a ring and is sleeved and fixed to the connecting rod part of the valve core 120. In some embodiments, the first magnetic element 131, the second magnetic element 132, and the third magnetic element 133 are a group of unit components. The valve body 110, valve core 120, or drive assembly 140 is provided with multiple groups of unit components. The number of multiple groups is determined as needed. If a larger magnetic attraction force needs to be adjusted, more groups of unit components can be set. Each group of unit components can be arranged side by side or spaced apart, such as the three first magnetic elements 131 being equidistant from each other.

[0036] Please refer to Figure 2 and Figure 4In some embodiments, the valve core 120 is provided with a protrusion 121 in the circumferential direction. This setting can be a conventional setting, that is, the protrusion 121 is formed on the outer periphery of the valve core 120. There are multiple protrusions 121 and they correspond to different positions of the valve body 110. The valve body 110 is provided with a flow channel 111 that communicates with the valve cavity 112. The flow channel 111 can be designed with different shapes as needed. The valve core 120 is used to move when it is subjected to the force of the reset action member, so that the protrusion 121 can move relative to the flow channel 111 to connect or disconnect the valve cavity 112 from the flow channel 111. By cooperating with the relative position of the flow channel 111 in the valve body 110, the flow direction of the fluid in the flow channel 111 is changed. The flow channel 111 has inlets and outlets on the outer wall of the valve body 110, and also has inlets and outlets on the inner wall of the valve cavity 112 of the valve body 110. This allows the flow channel 111 to communicate with the valve cavity 112, enabling fluid to smoothly enter and exit the valve cavity 112, thus facilitating fluid flow and guidance within the flow channel 111. The preset position is the corresponding position where the protrusion 121 mates with the flow channel 111. For example, when the protrusion 121 corresponds to the opening of a certain flow channel 111, it is recorded as the preset position. In some embodiments, the preset position is the corresponding position where the protrusion 121 mates with the flow channel 111. This position means that when the protrusion 121 corresponds to the opening of a certain flow channel 111, the width of the protrusion 121 is equal to the width of the opening of the flow channel 111, and the protrusion 121 precisely closes the opening of the flow channel 111.

[0037] In some embodiments, the valve body 110 includes a main valve body 113 and an end cap 114. The main valve body 113 has a valve cavity 112 inside, which serves as the movement space for the valve core 120 inside the main valve body 113 and the space for fluid flow. The end cap 114 is detachably connected to the main valve body 113 and is located at one end of the main valve body 113. The end cap 114 is used to close the valve cavity 112. The end cap 114 and the main valve body 113 are also provided with threaded holes corresponding to each other. Through-hole screws can fix the end cap 114 to one end of the valve body 110. The end cap 114 and the main valve body 113 can also be fixed by a threaded connection. A sealing ring can also be provided to achieve a tight seal. In some embodiments, the valve body 110 further includes a valve sleeve 115, which is embedded in the valve body 110 and fixed relative to the inner wall of the valve body 110. It can be an interference fit. The valve sleeve 115 houses the valve core 120, which is movably fitted to it on its inner side. The inner side of the valve sleeve 115 serves as part of the space of the valve cavity 112, in which the valve core 120 is located. The valve sleeve 115 has a channel that is opposite to the inlet and outlet of the flow channel 111, so that the flow channel 111 communicates with the valve cavity 112. When the valve sleeve 115 is used, the valve core 120 is placed in the valve sleeve 115. The movable fit between the valve core 120 and the valve sleeve 115 is the same as the fit principle between the valve core 120 and the valve body 110 described above, so that the flow channel 111 is connected to or disconnected from the valve cavity 112.

[0038] In the description of this application, the use of terms such as "some embodiments," "optional embodiments," "example," "specific example," "optional example," or "optional embodiment," etc., indicates that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of this application, but does not imply that these embodiments illustrate and describe all possible forms of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Furthermore, those skilled in the art can combine and integrate the different embodiments or examples described in this specification.

[0039] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. Although embodiments of this application have been shown and described, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of this application. Those skilled in the art will understand that various other specific changes and combinations of embodiments based on the technical teachings disclosed in this application, without departing from the essence of this application, are still within the protection scope defined by the claims of this utility model and their equivalent technical solutions.

[0040] Meanwhile, the technical solutions of the various embodiments can be combined with each other, but must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed in this application.

Claims

1. A magnetic attraction based servo valve characterized by, The application relates to a valve body (110) and a valve core (120), wherein the valve body (110) is provided with a valve cavity (112), the valve core (120) is arranged in the valve cavity (112), and the valve core (120) is movable along an axis of the valve core (120) relative to the valve body (110); a driving assembly (140) is arranged to drive the valve core (120) to move, the driving assembly (140) is provided with a rotor (141) in transmission connection with the valve core (120), and the rotor (141) and the valve core (120) are combined as a transmission part; a magnetic force assembly (130) comprises a plurality of magnetic unit elements, part of the unit elements are arranged in the valve body (110), and the remaining unit elements are arranged in the transmission part, the part of the unit elements and the remaining unit elements are opposite and spaced, so that, after power-off, the valve core (120) and the valve body (110) can be relatively moved through magnetic force between the plurality of unit elements until the valve core (120) is restored to a preset position along the axis of the valve core (120). The magnetic force assembly (130) comprises a first magnetic force element (131), a second magnetic force element (132) and a third magnetic force element (133), the first magnetic force element (131) and the second magnetic force element (132) are arranged at opposite positions of the valve body (110), and the third magnetic force element (133) is arranged at a spaced position between the first magnetic force element (131) and the second magnetic force element (132). The third magnetic force element (133) is fixedly connected with the rotor (141); or the third magnetic force element (133) is fixedly connected with the valve core (120). The opposite ends of the first magnetic force element (131) and the second magnetic force element (132) are oppositely polarized, the third magnetic force element (133) is arranged on the rotor (141); or the third magnetic force element (133) is arranged on the valve core (120), and the polarities of the ends of the third magnetic force element (133) are oppositely arranged with the polarities of the opposite ends.

2. The magnetic attraction based servo valve of claim 1, wherein, The first magnetic force element (131), the second magnetic force element (132) and the third magnetic force element (133) are regular-shaped permanent magnets.

3. The magnetic attraction based servo valve of claim 2, wherein, The first magnetic force element (131), the second magnetic force element (132) and the third magnetic force element (133) are a group of unit elements, and the valve body (110), the valve core (120) or the driving assembly (140) is provided with a plurality of groups of unit elements.

4. The magnetic attraction based servo valve of claim 3, wherein, The valve core (120) is provided with a protrusion (121) in a circumferential direction, the valve body (110) is provided with a flow channel (111) in communication with the valve cavity (112), and the protrusion (121) is movable relative to the flow channel (111) to communicate or disconnect the valve cavity (112) and the flow channel (111).

5. The magnetic attraction based servo valve of claim 2, wherein, The preset position is a corresponding position where the protrusion (121) cooperates with the flow channel (111).

6. The magnetic attraction based servo valve of claim 2, wherein, ​ 7. The magnetic attraction based servo valve of claim 1, wherein, ​ 8. The magnetic attraction based servo valve of claim 7, wherein, ​ 9. The magnetically based servo valve of any of claims 7-8, wherein, The valve body (110) includes a main valve body (113) having the valve cavity (112) inside, and an end cap (114) for closing the valve cavity (112), the end cap (114) being detachably connected to the main valve body (113).

10. The magnetic attraction based servo valve of claim 9, wherein, The valve body (110) also includes a valve sleeve (115), which is embedded and fixed inside the valve body (110). The valve sleeve (115) accommodates the valve core (120) and moves relative to it on its inner side, so that the flow channel (111) is connected to or disconnected from the valve cavity (112).

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