Normally open type proportional overflow valve

Abstract

The normally-open type proportional overflow valve comprises a valve body, the valve body comprises a shell and a valve element assembly, the valve element assembly comprises an armature, a guide column and a conical head, the guide column is partially arranged in the armature in a penetrating mode, a positioning ball is arranged in the middle of the guide column, a conical guide opening is formed in the armature, and the positioning ball abuts against the interior of the conical guide opening; the conical surface of the conical head is propped against the oil inlet hole; the flow control assembly comprises a damping spring, a limiting spring and a coil, the coil is arranged in the containing cavity, one end of the damping spring abuts against the positioning ball, the limiting cavity is further provided with a second limiting part, and the limiting spring is arranged in the second limiting part and used for pushing the guide column to the oil inlet hole. The guide column of the valve element assembly is synchronously controlled through the limiting spring and the damping spring, the rigidity coefficients of the limiting spring and the damping spring are adjusted, the stress conditions of the valve element assembly under different opening degrees can be optimized, nonlinear errors are reduced, and the control precision is improved.

Description

Technical Field

[0001] This utility model relates to the field of proportional relief valve technology, specifically to a normally open proportional relief valve. Background Technology

[0002] In the field of industrial automation control, proportional valves, as key fluid control components, are widely used in hydraulic systems, pneumatic systems, and various applications requiring precise flow or pressure regulation. Proportional valves receive electrical signals and convert them into mechanical displacement, thereby achieving continuous regulation of the flow rate and pressure of the fluid medium. Normally open proportional valves remain open when there is no signal input; when a control signal is received, the valve core gradually closes to regulate flow or pressure. This characteristic makes them irreplaceable in many industrial scenarios.

[0003] The existing technology has at least the following technical problems when implemented:

[0004] 1. Insufficient reset accuracy and stability: Traditional normally open proportional valves often employ a single-spring design. During valve spool reset, the single spring stiffness makes it difficult to simultaneously meet the requirements of rapid response and high-precision positioning. When the valve spool needs to quickly reset from a large opening to its initial position, the insufficient linearity of the single spring may lead to overshoot or oscillation, affecting system stability. Furthermore, the spring constant may change after long-term use, further reducing reset accuracy.

[0005] 2. Leakage and wear caused by axial positioning deviation: If the axial positioning of the valve core is inaccurate during movement, it is prone to uneven wear with the valve body, leading to accelerated wear of the sealing surface and consequently causing internal leakage. In existing technologies, some proportional valves achieve axial positioning through guide sleeves or slide rails, but these structures are easily affected by hydraulic or pneumatic forces under high-pressure and high-frequency conditions, resulting in decreased positioning accuracy and shortened valve service life. Utility Model Content

[0006] In order to solve the technical problems existing in the prior art, this application provides a normally open proportional relief valve.

[0007] To achieve the above objectives, the technical solution adopted in this application is as follows: a normally open proportional relief valve, comprising: a valve body, the valve body including a housing and a valve core assembly, the housing having a flow guiding cavity for guiding liquid, a receiving cavity for accommodating a coil, and a limiting cavity for mounting the valve core assembly, the housing having a mounting portion, the flow guiding cavity being located on the mounting portion, the housing being provided with an oil inlet nozzle communicating with the flow guiding cavity, the oil inlet nozzle having an oil inlet hole, and the mounting portion having a through-hole for reflux; the valve core assembly including an armature slidably disposed in the limiting cavity, a guide post, and a tapered head disposed at the end of the guide post, the guide post portion... The guide post is installed inside the armature, and a positioning ball is provided in the middle of the guide post. A conical guide opening is provided on the armature, and the positioning ball abuts against the conical guide opening. The conical surface of the conical head abuts against the oil inlet. The flow control assembly includes a damping spring, a limiting spring, and a coil. The coil is provided in the receiving cavity. The limiting cavity has a first limiting part for installing the damping spring. One end of the damping spring abuts against the positioning ball and is used to push the positioning ball against the conical guide opening. The limiting cavity also has a second limiting part, and the limiting spring is provided in the second limiting part. The limiting spring is used to push the guide post toward the oil inlet.

[0008] In some embodiments of this utility model, the positioning ball is provided with a mounting plate, and the damping spring is connected to the mounting plate.

[0009] In some embodiments of this utility model, a push bolt is provided on the housing, the push bolt extends into the limiting cavity, and the limiting spring abuts against the end of the push bolt located in the limiting cavity.

[0010] In some embodiments of this utility model, a baffle is provided at one end of the push bolt located in the limiting cavity, and the limiting spring abuts against the baffle.

[0011] In some embodiments of this utility model, a magnetic cylinder is provided between the armature and the housing.

[0012] In some embodiments of this utility model, a frame is provided inside the above-mentioned receiving cavity, and the coil is disposed inside the frame.

[0013] Beneficial effects:

[0014] 1. This utility model synchronously controls the guide column of the valve core assembly using a limiting spring and a damping spring. The dual-spring design improves the linearity and stability of the proportional valve. By adjusting the stiffness coefficients of the limiting spring and the damping spring, the force distribution on the valve core assembly at different opening degrees can be optimized, reducing nonlinear errors and improving control accuracy. Furthermore, the dual-spring design improves the dynamic response characteristics of the valve core assembly. The limiting spring provides rapid response to control signals, while the damping spring provides damping to prevent the valve core from oscillating due to inertia or hydraulic forces, thereby effectively improving the coaxiality of the guide column and the limiting cavity.

[0015] 2. The aforementioned engagement between the positioning ball and the tapered guide port achieves high-precision coaxial positioning through geometric constraints. The tapered surface of the tapered guide port and the spherical surface of the positioning ball form multi-point contact, utilizing the self-adaptive nature of the spherical surface to compensate for assembly errors, ensuring precise axial and radial alignment between the valve core and the valve body. During the valve core's movement, the contact surface between the positioning ball and the tapered guide port continuously provides dynamic guidance. When the valve core shifts due to external loads or machining errors, the automatic adjustment capability of the spherical contact points can correct the shift in real time, maintaining coaxiality stability. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram of the structure of an embodiment of this application;

[0018] Figure 2 This is a top view of an embodiment of this application;

[0019] Figure 3 for Figure 2 Sectional view of section AA;

[0020] Figure 4 for Figure 2 A sectional view of section BB in the middle.

[0021] In the diagram: 1-Shell; 2-Guide cavity; 3-Receiving cavity; 4-Mounting part; 5-Oil inlet; 6-Oil inlet hole; 7-Return hole; 8-Armature; 9-Guide post; 10-Conical head; 11-Conical guide port; 12-Positioning ball; 13-Damping spring; 14-Limiting spring; 15-Coil; 16-First limiting part; 17-Second limiting part; 18-Mounting plate; 19-Push bolt; 20-Baffle; 21-Magnetic guide cylinder; 22-Frame. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0023] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.

[0024] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0025] In the description of this application, it should be noted that the use of terms such as "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer" to indicate orientation or positional relationships is based on the orientation or positional relationships shown in the accompanying drawings, or the orientation or positional relationships commonly used when the product is in use. These terms are used solely for the convenience of describing this application and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application. Furthermore, the use of terms such as "first" and "second" in the description of this application is only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0026] Furthermore, the use of terms such as "horizontal" and "vertical" in the description of this application does not imply that the component is required to be absolutely horizontal or suspended, but rather that it may be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal relative to "vertical," and does not mean that the structure must be completely horizontal, but rather that it may be slightly tilted.

[0027] In the description of this application, it should also be noted that, unless otherwise expressly specified and limited, the terms "set up," "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 between two components. Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0028] Example

[0029] Please refer to Figures 1-4This embodiment provides a normally open proportional relief valve, including: a valve body, the valve body including a housing 1 and a valve core assembly, the housing 1 having a flow guiding cavity 2 for guiding liquid, a receiving cavity 3 for accommodating a coil 15 and a limiting cavity for mounting the valve core assembly, the housing 1 having a mounting part 4, the flow guiding cavity 2 being located on the mounting part 4, the housing 1 having an oil inlet 5 communicating with the flow guiding cavity 2, the oil inlet 5 having an oil inlet hole 6, and the mounting part 4 having a through-hole reflux hole 7; the valve core assembly including an armature 8 slidably disposed in the limiting cavity, a guide post 9 and a conical head 10 disposed at the end of the guide post 9, the guide post 9 partially passing through the armature 8, and a central portion of the guide post 9 having a... There is a positioning ball 12, and a tapered guide port 11 is provided on the armature 8. The positioning ball 12 abuts against the tapered guide port 11, and the tapered surface of the tapered head 10 abuts against the oil inlet 6. The flow control assembly includes a damping spring 13, a limiting spring 14, and a coil 15. The coil 15 is disposed in the receiving cavity 3. The limiting cavity has a first limiting part 16 for installing the damping spring 13. One end of the damping spring 13 abuts against the positioning ball 12 and is used to push the positioning ball 12 to abut against the tapered guide port 11. The limiting cavity also has a second limiting part 17. The limiting spring 14 is disposed in the second limiting part 17 and is used to push the guide post 9 toward the oil inlet 6.

[0030] In this embodiment, the valve body serves as the structural foundation and functional carrier of a normally open proportional valve, providing a design platform for fluid channel construction, installation and positioning, sealing and pressure support, and integration. Specifically, the housing 1 is used to install and fix the valve core assembly and flow control assembly, integrating them to guide flow and achieve closed-loop control. The valve core assembly works in conjunction with the valve body to perform flow control and pressure regulation.

[0031] In this embodiment, the above-mentioned flow guide cavity 2 is used to receive fluid. The flow guide cavity 2 changes the flow area by the displacement of the guide column 9, so as to realize continuous regulation of flow rate and pressure. When the electromagnetic force overcomes the spring force, the guide column 9 moves towards the oil inlet, thereby controlling the fluid to pass through the chamber inlet and reducing the flow rate. The flow rate can be controlled according to the magnitude of the electromagnetic force. When the electromagnetic force disappears, the spring pushes the valve core to reset, and the flow guide cavity 2 remains in the normally open state.

[0032] In this embodiment, the mounting part 4 is used to connect to the equipment using the proportional valve. The guide chamber 2 is located inside the mounting part 4, allowing fluid entering the guide chamber 2 to flow back after installation. The oil inlet 5 ensures that the fluid flows uniformly and stably into the guide chamber 2. The oil inlet hole 6 connects the oil inlet 5 and the guide chamber 2, enabling oil flow. The return hole 7 balances the system pressure. When the flow demand of the working component decreases, the return hole 7 can guide some fluid back to the original flow pipe, preventing drastic fluctuations in system pressure and ensuring stable pressure.

[0033] In this embodiment, the armature 8, which is slidably disposed in the limiting cavity, is used to transmit the movement of the guide post 9. Driven by the electromagnetic coil 15, the armature 8 slides axially along the limiting cavity, converting electromagnetic force into mechanical displacement of the guide post 9, thereby realizing the opening and closing of the valve port or flow regulation. The guide post 9 is used to displace after receiving magnetic force, thereby controlling the amount of oil entering the oil inlet 6 per unit time. The conical head 10 is used to cooperate with the oil inlet 6 to realize the opening and closing of the oil passage, ensuring a stable seal of the oil inlet 6 when closed, thus improving its sealing performance.

[0034] In this embodiment, the positioning ball 12 and the tapered guide opening 11 are used to correct the axiality of the guide post 9 and the limiting cavity, which can enable the guide post 9 to be accurately guided, automatically aligned, and compensate for errors. The positioning ball 12 forms a high-precision constraint with the contact point with the guide post 9, limiting its radial and axial offset. The cooperation between the positioning ball 12 and the tapered guide opening 11 can reduce the vibration and shaking of the guide post 9 and improve the stability of the system.

[0035] In this embodiment, the flow control component is used to control the distance between the tapered head 10 and the oil inlet 6 by generating electromagnetic force through the coil 15, thereby adjusting the amount of oil entering the valve core assembly. Specifically, the limiting spring 14 and the damping spring 13 are used to synchronously control the guide post 9 of the valve core assembly. The dual-spring design can improve the linearity and stability of the proportional valve. By adjusting the stiffness coefficients of the limiting spring 14 and the damping spring 13, the force on the valve core assembly at different opening degrees can be optimized, reducing nonlinear errors and improving control accuracy. The coil 15 generates a magnetic field after being energized, which interacts with the armature 8 to form an electromagnetic force, pushing the guide post 9 to move against the spring force.

[0036] Please refer to Figure 3 and Figure 4 In some embodiments of this example, the positioning ball 12 is provided with a mounting plate 18, and the damping spring 13 is connected to the mounting plate 18.

[0037] In this embodiment, the mounting plate 18 is used to provide force support for the action of the damping spring 13, so that the damping spring 13 can push the limit rod and armature 8 of the valve core assembly through the preload force, ensuring that the conical head 10 of the guide post 9 and the oil inlet 6 are in a separated state, and at the same time, it is in a normally open state when not energized.

[0038] Please refer to Figures 1-4 In some embodiments of this example, the housing 1 is provided with a push bolt 19, which extends into the limiting cavity, and the limiting spring 14 abuts against the end of the push bolt 19 located in the limiting cavity.

[0039] In this embodiment, the push bolt 19 is used to manually adjust the extension and retraction of the limit spring 14, which facilitates manual pre-adjustment of the normally open flow of the proportional valve. In use, by compressing the limit spring 14, the limit spring 14 compresses the reaction damping spring 13, thereby compressing the damping spring 13. The compression of the damping spring 13 causes the conical head 10 of the guide post 9 to gradually approach the inlet hole, thereby reducing the oil intake per unit time.

[0040] Please refer to Figures 3-4 In some embodiments of this example, a baffle 20 is provided at one end of the push bolt 19 located in the limiting cavity, and the limiting spring 14 abuts against the baffle 20.

[0041] In this embodiment, the baffle 20 is used to support the limiting spring 14, so that the limiting spring 14 is evenly stressed. The push bolt 19 is located at one end of the limiting cavity and extends into the limiting spring 14, thereby improving the stability of the limiting spring 14.

[0042] Please refer to Figures 1-4 In this embodiment, a locking nut (not shown in the figure) is fitted on the push bolt 19. The locking nut is located outside the housing 1 and abuts against the housing 1.

[0043] Please refer to Figure 3 and Figure 4 In some embodiments of this example, a magnetic cylinder 21 is provided between the armature 8 and the housing 1.

[0044] In this embodiment, the aforementioned magnetic guide cylinder 21 is typically made of a highly permeable magnetic material, and its function is to concentrate and enhance the magnetic field generated by the proportional valve electromagnet. Guided by the magnetic guide cylinder 21, the magnetic field can act more effectively on the valve core, thereby increasing the electromagnetic force and making the valve core's movement more sensitive and stable. The magnetic guide cylinder 21 reduces magnetic field leakage, allowing more magnetic lines of force to pass through the valve core, thus improving the electromagnet's energy conversion efficiency.

[0045] Preferably, the magnetic cylinder 21 is made of low-carbon steel or silicon steel.

[0046] Please refer to Figure 3 and Figure 4 In some embodiments of this example, a frame 22 is provided inside the above-mentioned receiving cavity 3, and the coil 15 is disposed inside the frame 22.

[0047] In this embodiment, the frame 22 provides a precise installation position for the electromagnetic coil 15, ensuring accurate relative positioning between the coil 15 and components such as the guide post 9 and the magnetic cylinder 21, and avoiding uneven magnetic field distribution or insufficient electromagnetic force due to installation deviations. The frame 22 can protect the coil 15 from mechanical vibration, impact, or compression, preventing deformation or damage to the coil 15.

[0048] In addition, the frame 22 is usually made of insulating material, including but not limited to plastic and ceramic, which can ensure electrical isolation between the coil 15 and metal parts such as the iron core and magnetic cylinder 21, and prevent short circuits or leakage.

[0049] In use, the mounting part 4 is aligned with the pre-drilled mounting hole on the equipment. The position of the bolt is adjusted using a wrench. The length of the first limiting part 16 inserted into the limiting cavity by turning the wrench increases continuously, compressing the limiting spring 14. The limiting spring 14 acts on the armature 8, and the armature 8 pushes the positioning ball 12. The positioning ball 12 compresses the damping spring 13, pushing the guide post 9 closer to the oil inlet 6. The fluid flow through the oil inlet 6 decreases per unit time. When it is necessary to control and increase the amount of oil entering, the adjusting bolt is turned in the opposite direction or energized into the coil 15. The energized coil 15 acts on the armature 8, and the electromagnetic force drives the armature 8 to compress the limiting spring 14. At the same time, the damping spring 13 extends, separating the conical block of the guide post 9 from the oil inlet 6.

[0050] The above description is merely a preferred embodiment of this application and is not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A normally open proportional relief valve, characterized in that, include: The valve body includes a housing (1) and a valve core assembly. The housing (1) has a flow guiding cavity (2) for guiding liquid, a receiving cavity (3) for accommodating a coil (15) and a limiting cavity for mounting the valve core assembly. The housing (1) has a mounting part (4). The flow guiding cavity (2) is located on the mounting part (4). The housing (1) is provided with an oil inlet (5) communicating with the flow guiding cavity (2). The oil inlet (5) has an oil inlet hole (6). The mounting part (4) has a through-hole (7). The valve core assembly includes an armature (8) slidably disposed in the limiting cavity, a guide post (9), and a conical head (10) disposed at the end of the guide post (9). The guide post (9) is partially inserted into the armature (8). A positioning ball (12) is disposed in the middle of the guide post (9). A conical guide opening (11) is opened on the armature (8). The positioning ball (12) abuts against the conical guide opening (11). The conical surface of the conical head (10) abuts against the oil inlet (6). The flow control assembly includes a damping spring (13), a limiting spring (14), and a coil (15). The coil (15) is disposed in the receiving cavity (3). The limiting cavity has a first limiting part (16) for mounting the damping spring (13). One end of the damping spring (13) abuts against the positioning ball (12) to push the positioning ball (12) against the conical guide port (11). The limiting cavity also has a second limiting part (17). The limiting spring (14) is disposed in the second limiting part (17) and the limiting spring (14) is used to push the guide post (9) toward the oil inlet (6).

2. The normally open proportional relief valve according to claim 1, characterized in that, The positioning ball (12) is provided with a mounting plate (18), and the damping spring (13) is connected to the mounting plate (18).

3. A normally open proportional relief valve according to claim 1, characterized in that, The housing (1) is provided with a push bolt (19), which extends into the limiting cavity, and the limiting spring (14) abuts against the end of the push bolt (19) located in the limiting cavity.

4. A normally open proportional relief valve according to claim 3, characterized in that, The push bolt (19) is provided with a baffle (20) at one end located in the limiting cavity, and the limiting spring (14) abuts against the baffle (20).

5. A normally open proportional relief valve according to claim 1, characterized in that, A magnetic cylinder (21) is provided between the armature (8) and the housing (1).

6. A normally open proportional relief valve according to claim 5, characterized in that, The cavity (3) is provided with a frame (22), and the coil (15) is disposed in the frame (22).

Images