Servo valve capable of resetting in case of power failure

Abstract

The utility model discloses a power-off reset servo valve, and belongs to the technical field of servo valves, the power-off reset servo valve 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 reset acting piece is located in the valve cavity and comprises two opposite ends, one end of the reset acting piece makes contact with the valve element, and the other end of the reset acting piece makes contact with the valve body. The relative positions of the two ends of the reset acting piece are adjusted through mutual acting force, so that the reset acting piece can drive the valve element to return to the preset position in the axial direction of the valve element after power failure. The reset acting piece can act with the valve element to drive the valve element to move in the axial direction of the valve element relative to the valve body, so that the valve element can change the flow direction of fluid in the flow channel, after power failure, acting force is applied to the valve element and the valve body through the reset acting piece, and the preset position can be restored; and it is ensured that the valve element of the servo valve can continue to move to the safety range after power failure, and the risk of the servo valve to the safety of the system is avoided.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of servo valves, and particularly relates to a servo valve capable of resetting after power failure. BACKGROUND

[0002] A servo valve is an important control element in a hydraulic system, widely used in aerospace, engineering machinery, industrial automation and other fields. Its main function is to adjust the flow of hydraulic oil by receiving control signals, thereby realizing precise force and position control. In complex working environments, the performance of the servo valve directly affects the stability and accuracy of the entire system.

[0003] Traditional servo valves cannot restore the initial position after power failure. Usually, the servo valve works according to the input signal in the power-on state, but in the case of power failure, the output position of the valve core of the servo valve is often uncontrollable, and the valve core cannot return to the initial position, which may pose risks to system safety and equipment protection. For example, in some critical industrial scenarios, when the hydraulic system is powered off or emergency stopped, the servo valve may be in an unexpected state, causing mechanical equipment to lose control, hydraulic cylinder movement to stop, or system pressure to be too high. CONTENT OF THE INVENTION

[0004] The application aims to at least solve the technical problem of servo valve power failure without resetting. To this end, the application provides a servo valve capable of resetting after power failure, which can restore the valve core to the preset position after power failure, ensuring that the valve core of the servo valve can continue to move to a safe range after power failure, avoiding risks to the safety of the system in which the servo valve is located.

[0005] The application provides a servo valve capable of resetting after power failure, which comprises:

[0006] A valve body and a valve core, the valve body is provided with a valve cavity, and the valve core is arranged in the valve cavity and movable along its own axial direction relative to the valve body;

[0007] A resetting member located in the valve cavity, the resetting member comprises two ends arranged oppositely, one end in contact with the valve core and the other end in contact with the valve body; the two ends of the resetting member adjust the relative position through mutual interaction force, so that the resetting member can drive the valve core to return to the preset position along its own axial direction after power failure.

[0008] In some embodiments, an adjusting member is further included, connected to the valve body, and having opposite first and second ends; the first end is in the valve cavity and used to contact and act on the resetting member; the second end is located outside the valve cavity and used to adjust the relative position with the valve body, so that the first end acts on the resetting member.

[0009] In some embodiments, the adjusting member and the valve body can be relatively fixed in the state of determining the relative position.

[0010] In some embodiments, the reset acting member is an integral structure made of elastic material; or the reset acting member is a split structure, which includes at least two magnetic bodies made of magnetic material, one part of the magnetic bodies is connected with the valve core, and the other part of the magnetic bodies is connected with the valve body.

[0011] In some embodiments, the magnetic bodies are arranged in the same polarity and opposite to each other, so that the magnetic force acts between the valve core and the valve body.

[0012] In some embodiments, the reset acting member includes at least two groups, one group is located at one end of the valve core, and the other group is located at a position spaced from the end of the valve core.

[0013] In some embodiments, each group of the reset acting member includes at least one acting part.

[0014] In some embodiments, the valve core is provided with a protrusion in the circumferential direction, the valve body is provided with a flow channel communicating with the valve cavity, and the preset position is a corresponding position where the protrusion cooperates with the flow channel.

[0015] In some embodiments, the valve body includes a main valve body and an end cover, the main valve body is provided with a valve cavity, the end cover is detachably connected with the main valve body, and the end cover is connected with the adjusting member.

[0016] In some embodiments, the valve body further includes a limiting member connected with the main valve body and located in the valve cavity, and the limiting member is in contact with or connected with the reset acting member.

[0017] According to the above technical solution, the application has the following beneficial effects:

[0018] In the application, the valve core moves along the axial direction of the valve core relative to the valve body, the valve core can smoothly control the fluid in the servo valve during the movement, the reset acting member can act on the valve core to drive the valve core to move along the axial direction of the valve core relative to the valve body, so that the valve core can change the flow direction of the fluid in the flow channel, and the preset position of the valve core relative to the valve body can be determined according to the needs. Specifically, one end of the reset acting member in the valve cavity is in contact with the valve core to transmit the force to the valve core, the other end of the reset acting member is in contact with the valve body to transmit the force to the valve body, and the two ends of the reset acting member act on each other to adjust the relative position between the two ends. The valve core and the valve body in contact with the two ends of the reset acting member can move relative to each other by the action force of the reset acting member. In this way, before power failure, the valve core is driven to move by the external force, and a part of the external force can be transmitted to the reset acting member. After power failure, the valve core is restored to the preset position by the action force of the two ends of the reset acting member on the valve core and the valve body, so that the valve core of the servo valve can continue to move to the safe range after power failure, and the risk of the servo valve to the system is avoided. BRIEF DESCRIPTION OF DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiment description will be briefly introduced one by one, and obviously, the drawings in the following description are some embodiments of the present application, and all other embodiments obtained by those skilled in the art without creative labor on the basis of these drawings also belong to the protection scope of the present application.

[0020] Figure 1 An embodiment one schematic diagram of the power-off reset servo valve of the utility model is shown.

[0021] Figure 2 An embodiment two schematic diagram of the combination of the adjusting part and the valve body of the utility model is shown.

[0022] Figure 3 An embodiment three schematic diagram of the power-off reset servo valve of the utility model is shown.

[0023] Figure 4 An embodiment four schematic diagram of the power-off reset servo valve of the utility model is shown.

[0024] Figure 5 An embodiment schematic diagram of the arrangement of a group of magnetic bodies of the utility model is shown.

[0025] Figure 6 An embodiment five schematic diagram of the combination of the adjusting part and the valve body of the utility model is shown.

[0026] The reference signs: 100, servo valve; 110, valve body; 111, flow passage; 112, valve cavity; 113, main valve body; 114, end cover; 115, limiting part; 116, valve sleeve; 120, valve core; 121, protrusion; 130, reset acting part; 131, elastic body; 132, magnetic body; 140, adjusting part; 150, driving assembly. DETAILED DESCRIPTION

[0027] The technical solutions in the embodiments of the present application will be described clearly and completely in the following detailed description of the embodiments of the present application in combination with the drawings corresponding to the specific embodiments of the present application, and the detailed description of the embodiments of the present application provided in the following description is not intended to limit the scope of the present application claimed, and the described embodiments are only some embodiments of the present application, but not all the embodiments. Based on the embodiments in the present application, various different configurations can be arranged and designed, and all other embodiments obtained by those skilled in the art without creative labor also belong to the protection scope of the present application.

[0028] The present application will be described in the following in combination with the drawings and with reference to specific embodiments.

[0029] Please refer to Figure 1 The embodiment of the application provides a power-off reset servo valve 100, which comprises a valve body 110, a valve core 120 and a reset action piece 130. The valve body 110 and the valve core 120 are conventional parts of the servo valve 100, and the servo valve 100 is electric, electro-hydraulic or pneumatic. The valve body 110 is provided with a valve cavity 112, which is closed relative to the outside, and only the fluid inlet and outlet, the mounting port of the driving assembly 150 and the like are reserved. The valve core 120 is arranged in the valve cavity 112 and is movable relative to the valve body 110 along the axial direction of the valve core 120. The valve core 120 is movable in the valve cavity 112 along the axial direction and can also be movable in other directions. The action between the valve core 120 and the reset action piece 130 is mainly in the axial direction of the valve core 120. The valve body 110 is provided with a flow channel 111 which is in communication with the valve cavity 112. The relative position of the valve core 120 and the valve body 110 can be adjusted, so that the flow direction of the fluid in the flow channel 111 can be regulated. The reset action piece 130 is arranged in the valve cavity 112. The reset action piece 130 comprises two ends which are arranged oppositely. One end is in contact with the valve core 120 and can transmit the force between the two ends of the reset action piece 130 to the valve core 120 through the contact. The other end is in contact with the valve body 110 and can transmit the force between the two ends to the valve body 110 through the contact. The two ends of the reset action piece 130 adjust the relative position through the mutual force. The mutual force is elastic force, magnetic force or other force. For example, the reset action piece 130 can generate the force through the external force, or the force can be converted from the potential energy stored between the two ends of the reset action piece 130 through the force applied by the valve core 120 during the operation. When the relative position of the two ends of the reset action piece 130 is adjusted, the two ends of the reset action piece 130 can simultaneously generate the force on the valve core 120 and the valve body 110. The reset action piece 130 can adopt a device such as a spring or a magnet which can generate the force through the internal force and act on the outside. Since the valve core 120 is movable, the reset action piece 130 can drive the valve core 120 to return to the preset position along the axial direction of the valve core 120 after the power-off. The preset position is the initial position set according to the requirement. The preset position is the initial position or the zero position.

[0030] The prior art servo valve cannot return to the initial position after power failure. Generally, the servo valve works according to the input signal in the power-on state, but in the power-off state, the spool output position of the servo valve is often uncontrollable, and the spool cannot return to the initial position, generally referred to as the zero position. This can cause many problems: abnormal initial state of the system, the system cannot start normally, error after starting; interference between mechanical structures in the system, damage to mechanical structures; abnormal fluid pressure, causing structural damage, leakage, etc., and even endangering safety. However, the valve core 120 can smoothly control the fluid in the servo valve 100 when moving along the axial direction of the valve core 120, and the reset acting element 130 can act on the valve core 120 to drive the valve core 120 to move along the axial direction of the valve core 120 relative to the valve body 110, so that the valve core 120 can change the flow direction of the fluid in the flow passage 111, and the preset position of the valve core 120 relative to the valve body 110 can be determined as needed. Specifically, one end of the reset acting element 130 in the valve cavity 112 can transmit force to the valve core 120 by contacting the valve core 120, and the other end of the reset acting element 130 can transmit force to the valve body 110 by contacting the valve body 110, and the two ends of the reset acting element 130 can adjust the relative position between the two ends by the interaction force, and the valve core 120 and the valve body 110 contacting the two ends of the reset acting element 130 respectively can move relative to each other by the force applied by the reset acting element 130. In this way, before power failure, the valve core 120 is driven to move by external force, and a part of the external force can be transmitted to the reset acting element 130. After power failure, the reset acting element 130 can apply force to the valve core 120 and the valve body 110 to restore the valve core 120 to the preset position, so that the valve core 120 of the servo valve 100 can continue to move to a safe range after power failure, avoiding the risk of the servo valve 100 to the safety of the system it is in, to meet the requirements of safety and reliability of equipment in special scenarios.

[0031] Please refer to Figure 2 In some embodiments, further comprising an adjusting element 140 connected to the valve body 110, the adjusting element 140 having opposite first and second ends, the right end of the adjusting element 140 in the figure as the first end, and the left end of the adjusting element 140 in the figure as the second end; the first end is in the valve cavity 112, used to contact and act on the reset acting element 130, and the end face of the first end contacts one end of the reset acting element 130; the second end is located outside the valve cavity 112, used to adjust the relative position with the valve body 110, so that the first end acts on the reset acting element 130. In this way, by applying force to the second end of the adjusting element 140 outside the valve body 110, force can be applied to the valve core 120 through the first end of the adjusting element 140, and the valve core 120 can be driven to return to the preset position after power failure.

[0032] In some embodiments, the adjusting member 140 and the valve body 110 can be relatively fixed in a relative position determining state, i.e., the adjusting member 140 can be fixed with the valve body 110 after adjustment in a conventional manner such as threaded connection, buckle connection, etc., so as to ensure that the valve core 120 remains stable after returning to the preset position. In some embodiments, the adjusting member 140 includes two parts: a rod part and a plate part, which are integrally formed. The rod part matches the threaded hole provided at one end of the valve body 110, and the rod part can drive the plate part to rotate relative to the valve body 110 and move along the setting direction of the threaded hole by rotating. The end of the rod part located outside the valve body 110 serves as the second end mentioned above, and the end can be recessed to facilitate external tool rotation, such as an internal hexagonal hole. The other end of the rod part is integrally connected with the plate part, which is disc-shaped or can also have other shapes. The end surface of the plate part is in contact with the end of the valve core 120, and the end surface serves as the first end mentioned above.

[0033] Please refer to Figure 3 and Figure 4 In some embodiments, the reset acting member 130 is an integral structure of elastic material, which is a material capable of providing elastic force and acting externally, such as a polyurethane elastic structure providing elastic force. The integral structure of elastic material is an elastic member capable of providing elastic force through material and structure, such as a carbon steel spring, a common spring including a coil spring, a disc spring, a plate spring, etc. Through the integral structure, the adjusting member 140 can indirectly exert force on the valve core 120. In some embodiments, the reset acting member 130 is a split structure including at least two magnetic bodies 132 having magnetic material. Part of the magnetic bodies 132 are connected with the valve core 120, and the other part of the magnetic bodies 132 are connected with the valve body 110. For example, the split structure includes two magnetic bodies 132. One of the magnetic bodies 132 has an end surface as the first end mentioned above and is in contact with the valve core 120. The other magnetic body 132 has an end surface as the second end mentioned above and is in contact with the valve body 110. The magnetic bodies 132 can be permanent magnets such as aluminum-nickel-cobalt permanent magnets and ferrite permanent magnets.

[0034] Please refer to Figure 5 In some embodiments, the plurality of magnetic bodies 132 are arranged in the same polarity to enable the valve core 120 and the valve body 110 to act on each other through magnetic force. The magnetic bodies 132 can be arranged in multiple numbers and are spaced apart along the movement direction of the valve core 120. In order to simplify the structure, the magnetic bodies 132 are provided in two numbers. One of the two magnetic bodies 132 is attached to the end of the valve cavity 112 in the valve body 110, and the other is attached to the end of the valve core 120. The two magnetic bodies 132 can interact in the space between the end of the valve core 120 and the inner wall of the valve body 110. The opposite end surfaces of the two magnetic bodies 132 are of the same polarity, such as Figure 5 the opposite end surfaces of the two magnetic bodies 132 in the above-mentioned example are S poles.

[0035] Please refer to Figure 3 and Figure 4 In some embodiments, the reset member 130 includes at least two groups. When the reset member 130 has multiple groups, the valve core 120 will be displaced until the internal forces of different groups are consistent, and then the valve core 120 returns to a certain position, which can be set as a preset position, such as the initial position of the valve core 120. The internal forces of each group are consistent, such as the spring forces of each spring. The following is an example of two groups. One group is located at one end of the valve core 120, and the other group is located at a position spaced from the end of the valve core 120, such as Figure 3 One elastic member is located at one end of the valve core 120, and the other elastic member is located at a position close to the other end of the valve core 120, such as Figure 4 Two magnetic bodies 132 are used as a group. One group of magnetic bodies 132 is placed at one end of the valve core 120 and the end of the valve cavity 112 in the valve body 110. The other group of magnetic bodies 132 is placed at a position close to the other end of the valve core 120 and the inner wall of the valve cavity 112 of the valve body 110. Among the two magnetic bodies 132, one is attached to and fixedly connected with the valve core 120, and the other is attached to and fixedly connected with the inner wall of the valve body 110, such as bonding, clamping, interference fit, etc. The above setting position can be determined as needed to ensure that one group of the two groups is located at the end of the valve core 120, and the other group is located at a position spaced from the first group.

[0036] In some embodiments, each group of reset members 130 includes at least one action part, i.e., each group of reset members 130 described above can have one, two or more action parts. The action part can be considered as the elastic body 131 or the magnetic body 132 described above. When it is one elastic body 131, such as Figure 3 When the number of springs is two or more, the multiple springs can be arranged in an inner-outer sleeve manner or a side-by-side manner. The magnetic body 132 is generally arranged in a group of two. The two magnetic bodies 132 are arranged with the same polarity opposite to each other, and one is connected with the valve core 120 and the other is connected with the valve body 110.

[0037] In some embodiments, the valve core 120 is provided with a protrusion 121 in the circumferential direction. The protrusion 121 can be provided in a conventional manner, i.e. protruding from the outer side of the valve core 120. The protrusion 121 can be provided in multiple numbers and correspond to different positions of the valve body 110. The valve body 110 is provided with flow channels 111 that are in communication with the valve cavity 112. The flow channels 111 can be designed in different shapes as required. The valve core 120 is used to move under the action of the restoring member 130. By matching the relative position of the flow channels 111 in the valve body 110, the flow direction of the fluid in the flow channels 111 can be changed. The flow channels 111 have inlets and outlets on the outer wall of the valve body 110. The inner wall of the flow channels 111 at the valve cavity 112 is also provided with inlets and outlets. In this way, the flow channels 111 are in communication with the valve cavity 112, and the fluid can smoothly enter and exit the valve cavity 112 to achieve the flow and guidance of the fluid in the flow channels 111. The preset position is the corresponding position of the protrusion 121 matching the flow channels 111, such as when the protrusion 121 corresponds to the inlet of a flow channel 111, which is recorded as the preset position. When the protrusion 121 corresponds to the inlet of a flow channel 111, the width of the protrusion 121 is equal to the width of the inlet of the flow channel 111, and the protrusion 121 exactly closes the inlet of the flow channel 111.

[0038] Please refer to Figure 6 In some embodiments, the valve body 110 includes a main valve body 113 and an end cover 114. The main valve body 113 is provided with a valve cavity 112, which serves as the movement space of the valve core 120 and the space for fluid flow. The end cover 114 is detachably connected to the main valve body 113. The end cover 114 is located at one end of the main valve body 113 and is used to close the valve cavity 112. The end cover 114 is recessed at the end face close to the valve cavity 112 to form a notch, which is embedded with one end of the restoring member 130, such as the elastic body 131. The end cover 114 and the main valve body 113 are also provided with position corresponding threaded holes. A through-hole screw can be used to fix the end cover 114 at one end of the valve body 110. The end cover 114 and the main valve body 113 can also be fixed by screw connection. The middle part of the end cover 114 is provided with a smaller threaded hole. The adjusting member 140 matches and extends out of the threaded hole, such as the rod part matching and connecting with the end cover 114 through the threaded hole. In this way, the end cover 114 is connected with the adjusting member 140, and a sealing ring can also be provided. In some embodiments, the valve body 110 also includes a valve sleeve 116, which is embedded in the valve body 110 and located in the valve cavity 112. The valve sleeve 116 is provided with a hole that is opposite to the inlet and outlet of the flow channel 111, so that the flow channel 111 is in communication with the valve cavity 112. When the valve sleeve 116 is used, the valve core 120 is placed in the valve sleeve 116. The movement matching mode of the valve core 120 and the valve sleeve 116 is the same as the matching principle of the valve core 120 and the valve body 110 described above.

[0039] Please refer to Figure 3 or Figure 4In some embodiments, the valve body 110 further comprises a limiting member 115 connected to the main valve body 113 and located in the valve cavity 112, the limiting member 115 is in contact with or connected to the reset member 130, for example, the limiting member 115 is annular, the limiting member 115 is clamped on the inner wall of the valve body 110, the outer edge of the annular limiting member 115 is fixed on the inner wall of the valve body 110, the side of the limiting member 115 is in contact with or connected to the reset member 130, the limiting member 115 is spaced from the position on the valve core 120 where the elastic body 131 or the magnetic body 132 can be clamped, for example, the position between the middle and the end of the valve core 120, the valve core 120 has a step or a platform on the outer side, one magnetic body 132 is annular and bonded to the step or the platform, the other magnetic body 132 is also annular and bonded to one side of the limiting member 115 or in contact with the limiting member 115, so that the two magnetic bodies 132 are spaced and can interact with each other to restore the valve core 120 to the preset position. In some embodiments, the servo valve 100 further comprises a driving assembly 150, and the valve body 110 is provided with a mounting port, the driving assembly 150 is mounted at the mounting port, and the output end of the driving assembly 150 is in transmission connection with the valve core 120, the driving assembly 150 can adopt a motor, and the driving assembly 150 drives the valve core 120 to move axially for work, which belongs to the prior art, for example, a direct drive type electro-hydraulic servo valve 100.

[0040] In the description of the present application, the description of the terms "some embodiments", "optional embodiments", "examples", "specific examples", "optional examples" or "optional embodiments" means that the specific features, structures, materials or characteristics described in connection with the embodiments or examples are included in at least one embodiment or example of the present application, but it does not mean that all possible forms of the present application are described and explained by these embodiments. In the description, the illustrative description of the above terms is not necessarily directed to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in the specification.

[0041] In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it. Although the embodiments of the present application have been shown and described, various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the present application. Those skilled in the art can understand that various other specific changes and combination embodiments can be made according to the technical inspiration disclosed in the present application without departing from the essence of the present application, which are still within the protection scope of the claims of the present application and equivalent technical solutions.

[0042] Meanwhile, the technical solutions among various embodiments can be combined with each other, but must be based on that a person skilled in the art can realize, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, also not within the protection scope required by the present application.

Claims

1. A de-energized reset servo valve characterized by, The utility model relates to a valve body (110) and valve core (120), the valve body (110) is equipped with valve cavity (112), the valve core (120) is located in the valve cavity (112), the valve core (120) is movable along the self axial direction relative to the valve body (110); Resetting member (130) is located in the valve cavity (112), the resetting member (130) includes the opposite setting both ends: one end is in contact with the valve core (120), the other end is in contact with the valve body (110), the both ends of the resetting member (130) are adjusted through the mutual interaction force relative position, make the resetting member (130) can drive the valve core (120) and restore to the preset position along the self axial direction after power off. Still include adjusting part (140), is connected to the valve body (110), the adjusting part (140) has opposite first end and second end, the first end is in the valve cavity (112), is used for being in contact with the resetting member (130) and acting, the second end is located outside the valve cavity (112), is used for adjusting the relative position with the valve body (110), make the first end act on the resetting member (130).

2. The de-energized reset servo valve of claim 1, wherein, The adjusting part (140) and the valve body (110) can be relatively fixed in the relative position determination state.

3. The de-energized reset servo valve of claim 2, wherein, The resetting member (130) is an integral structure with elastic material, or the resetting member (130) is a split structure, the split structure includes at least two magnetic bodies (132) with magnetic material, part of the magnetic body (132) is connected with the valve core (120), and another part of the magnetic body (132) is connected with the valve body (110).

4. The de-energized reset servo valve of claim 1, wherein, A plurality of the magnetic body (132) is arranged in the same polarity, so that the valve core (120) and the valve body (110) are acted on by magnetic force.

5. The de-energized reset servo valve of claim 4, wherein, The resetting member (130) includes at least two groups, one group is located at one end of the valve core (120), and the other group is located at a position spaced from the end of the valve core (120).

6. The de-energized reset servo valve of any one of claims 1-5, wherein, Each group of the resetting member (130) includes at least one acting part.

7. The de-energized reset servo valve of claim 6, wherein, The valve core (120) is provided with a protrusion (121) in the circumferential direction, the valve body (110) is provided with a flow channel (111) communicating with the valve cavity (112), and the preset position is a corresponding position where the protrusion (121) cooperates with the flow channel (111).

8. The de-energized reset servo valve of any one of claims 1-5, wherein, The valve body (110) includes a main valve body (113) and an end cover (114), the valve cavity (112) is arranged in the main valve body (113), the end cover (114) is detachably connected with the main valve body (113), and the end cover (114) is connected with the adjusting part (140).

9. The de-energized reset servo valve of any of claims 2-3, wherein, The valve body (110) further includes a limiting member (115) connected to the main valve body (113) and located in the valve cavity (112), and the limiting member (115) is in contact with or connected to the resetting member (130).

10. The de-energized reset servo valve of claim 9, wherein, ​

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