Electromagnetic valve with external magnetic yoke

Abstract

The utility model provides a kind of solenoid valve of external magnetic yoke, including valve body, movable valve piece, electromagnetic drive assembly and magnetic yoke structure, valve body has for fluid on-off import and export passage;Movable valve piece is arranged at the valve seat position between the passage, for realizing the opening and closing control of fluid passage;Electromagnetic drive assembly is used to drive the movable valve piece, opens or closes passage at the valve seat;Magnetic yoke structure is arranged in the external space of electromagnetic drive assembly, is not covered by the coil package body of electromagnetic drive assembly, and with the magnetic part of the electromagnetic drive assembly forms magnetic flux closed path, so that while guaranteeing the effectiveness of magnetic circuit, the thickness and weight of solenoid valve overall are reduced.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic valve technology, and more specifically, to an electromagnetic valve with an external magnetic yoke. Background Technology

[0002] As a key component in fluid automatic control systems, the external magnetic yoke solenoid valve uses an electromagnetic drive structure to open and close the movable valve parts inside the valve body, thereby realizing the on / off control of fluid in the pipeline.

[0003] However, existing solenoid valves generally employ a built-in yoke structure, where the yoke element is housed within the electromagnetic drive coil package, forming a closed magnetic circuit with the armature via a magnetic core surrounding the coil. While this structure ensures basic magnetic circuit closure, it still suffers from the following significant shortcomings in practical applications: First, since the magnetic yoke must be encapsulated inside the coil, its structural dimensions are limited by the coil housing, making it difficult to further compress the entire solenoid valve in the thickness and height directions, which is not conducive to miniaturization design. Second, since the magnetic yoke and the coil are co-encapsulated in a plastic housing, the magnetic conductivity is easily affected by factors such as housing material, electromagnetic interference, and thermal expansion, which in turn leads to reduced magnetic efficiency and increased energy consumption.

[0004] The aforementioned problems severely restrict the overall performance improvement and structural optimization of solenoid valves, especially in scenarios with strict requirements on size, power consumption, and assembly flexibility. Therefore, existing technologies urgently need to improve solenoid valves and develop a new type of solenoid valve with an external magnetic yoke design to overcome the limitations of existing solutions in terms of size reduction and modular design. Utility Model Content

[0005] The purpose of this application is to provide a solenoid valve with an external magnetic yoke. By placing the magnetic yoke outside the coil package, an efficient magnetic flux path is constructed, thereby reducing the overall size and weight while improving assembly flexibility and structural compactness.

[0006] This application proposes a solenoid valve with an external magnetic yoke, comprising: The valve body has inlet and outlet channels for fluid flow control; A movable valve element, wherein the movable valve element is disposed at a valve seat position between the channels; An electromagnetic drive assembly is used to drive the movable valve to open or close the channel at the valve seat; A magnetic yoke structure is disposed in the external space of the electromagnetic drive assembly, is not covered by the coil package of the electromagnetic drive assembly, and forms a closed magnetic flux path with the magnetic part of the electromagnetic drive assembly, thereby reducing the overall size and weight of the solenoid valve while ensuring the effectiveness of the magnetic circuit.

[0007] It should be noted that the term "external" in this article refers to the magnetic yoke structure not being embedded inside the coil package, but being independently arranged in the external space of the electromagnetic drive component, forming a magnetic circuit through direct connection with the magnetic part; "magnetic flux closed path" refers to the magnetic yoke structure cooperating with the magnetic components of the electromagnetic drive component to enable the magnetic field to circulate along a preset path, avoiding magnetic leakage and ensuring magnetic circuit efficiency.

[0008] By moving the magnetic yoke structure from inside the coil package to the external space, the limitation imposed on the overall size of the solenoid valve by the traditional built-in magnetic yoke is broken. In conventional solenoid valves, the magnetic yoke is typically integrated with the coil, resulting in an increased overall coil volume and consequently, an increase in the radial or axial dimensions of the solenoid valve. In this application, the magnetic yoke structure is independently disposed outside the electromagnetic drive assembly, without occupying internal space within the coil package. While ensuring magnetic flux closure, the volume of the coil package can be significantly reduced, thereby decreasing the overall size and weight of the solenoid valve.

[0009] Meanwhile, the external magnetic yoke structure allows for more flexible magnetic circuit design. The yoke structure can be flexibly adjusted in shape and installation according to the position of the magnetic components, without being limited by the internal structure of the coil enclosure. This enables a more precise and efficient magnetic flux path to be formed with the magnetic components, reducing magnetic losses. Furthermore, the external design facilitates the separate processing, installation, and maintenance of the yoke structure, reducing production and repair costs.

[0010] In one embodiment, the electromagnetic drive assembly includes a coil, a fixed magnetic core, and an armature that forms a magnetic circuit with the fixed magnetic core.

[0011] When the coil is energized, it generates a magnetic field. The fixed magnetic core, acting as a fixed magnetic component within this field, works in conjunction with the movable armature to form a magnetic circuit. When energized, the fixed magnetic core generates a magnetic force that attracts the armature, which in turn moves the movable valve to open the channel. When de-energized, the magnetic force disappears, and the movable valve resets, closing the channel. This structure, through the magnetic circuit interaction between the fixed magnetic core and the armature, ensures the stability and reliability of the electromagnetic drive. Simultaneously, it provides clearly defined magnetic connection nodes for the yoke structure, enabling precise alignment of the yoke to form a closed magnetic flux path.

[0012] In one embodiment, the magnetic yoke structure is a magnetic conductor, which is installed in such a way that it is magnetically connected to the fixed magnetic core and / or armature to form a complete magnetic flux loop.

[0013] The magnetic conductor has a compact structure and high magnetic permeability, making it suitable for forming closed magnetic flux channels with magnetic components consisting of a fixed magnetic core and armature. Through magnetic connection with magnetic components, the magnetic conductor can achieve continuous magnetic field transmission, reduce magnetic resistance, and improve electromagnetic drive efficiency.

[0014] In one embodiment, the magnetic yoke structure is made of a soft magnetic material, preferably including pure iron, silicon steel, or soft magnetic stainless steel.

[0015] Soft magnetic materials possess high permeability and low coercivity, enabling efficient magnetic field conduction, reducing magnetic reluctance and loss in the magnetic circuit, and ensuring the effectiveness of the magnetic flux closure path. Pure iron exhibits excellent magnetic permeability, making it suitable for applications requiring high magnetic efficiency; silicon steel offers good high-frequency magnetic properties, reducing eddy current losses and making it suitable for high-frequency operating solenoid valves; soft magnetic stainless steel combines magnetic permeability with corrosion resistance, making it suitable for humid or corrosive working environments. The selection of different materials adapts to different application scenarios, enhancing the environmental adaptability of solenoid valves.

[0016] In one embodiment, the magnetic yoke structure is detachably installed on the housing of the valve body or electromagnetic drive assembly by means of threaded connection, snap-fit ​​connection, plug-in fit or adhesive bonding, so as to adapt to different structural layouts and improve assembly flexibility and maintenance convenience.

[0017] In one embodiment, the valve body inlet and outlet are provided with external threaded interfaces, which can be directly connected to standard pipe fittings for easy on-site installation.

[0018] The external thread interface conforms to industry-standard specifications and can be directly connected to standard pipe fittings or pipes on the market without the need for additional adapters, simplifying the on-site installation process and reducing assembly difficulty and cost. At the same time, the standardized interface design enhances the solenoid valve's versatility, enabling it to adapt to different piping systems and expanding its application range.

[0019] Multiple installation methods offer flexibility for different assembly scenarios: threaded connections offer high strength and are detachable, facilitating later maintenance and replacement; snap-fit ​​and plug-in connections provide convenient installation, suitable for rapid assembly in mass production; adhesive bonding offers a compact structure, requiring no additional installation space and further reducing the size of the solenoid valve. The magnetic yoke structure allows for selection of an appropriate installation method based on the structural characteristics of the valve body and electromagnetic drive components, ensuring installation stability without increasing the overall size.

[0020] In one embodiment, the magnetic yoke structure is disposed outside the coil and arranged in a manner that adapts to the position of the magnetic components, so that its magnetic conduction path is effectively coupled with the magnetic flux path generated by the coil, thereby constructing a complete magnetic flux closed loop.

[0021] In one embodiment, the valve body has a streamlined structure.

[0022] A streamlined structure refers to a valve body with a smooth transition in its outer contour, without obvious sharp angles or abrupt changes in cross-section. Its main functions include: First, optimizing the external stress on the valve body, making it suitable for scenarios with significant vibration or fluid impact. The smooth outer contour can disperse stress and avoid valve body damage caused by localized stress concentration. Second, reducing weight, providing a structural basis for subsequent lightweight design. The smooth transition in the outer contour can reduce the amount of valve body material used while ensuring valve body strength, indirectly achieving a weight reduction effect. This is suitable for scenarios with strict requirements on installation weight (such as fluid control in vehicles).

[0023] In one embodiment, the valve body surface is further provided with a longitudinal groove, which is a rounded transition concave surface that extends along the outer contour of the valve body and is integrally formed with the valve body to reduce the overall weight and improve the streamline of the shape.

[0024] Longitudinal grooves refer to concave structures extending along the valve body axis, rather than transverse or oblique grooves, ensuring that the grooves do not affect the structural strength of the valve body; rounded corner transitions refer to the use of rounded edges on the grooves to avoid stress concentration caused by sharp corners, while further enhancing the streamlined shape; one-piece molding refers to the grooves and valve bodies being processed simultaneously through casting, injection molding, and other processes, eliminating the need for subsequent cutting and reducing production costs.

[0025] In one embodiment, the movable valve is further provided with a reset mechanism, which includes a spring structure for applying a reset force to the movable valve and resetting the movable valve to the closed state when the electromagnetic drive assembly is de-energized.

[0026] The spring structure, serving as a reset mechanism, is characterized by its simple structure, high reliability, and low cost. When the electromagnetic drive assembly is de-energized, the spring's elastic force quickly pushes the movable valve component back to its seat position, closing the inlet and outlet channels and ensuring the solenoid valve's safe shut-off function during power outages. Furthermore, the spring's reset force can be precisely controlled by adjusting spring parameters (such as wire diameter, number of turns, and elastic coefficient) to adapt to different pressure levels and on / off requirements, thereby improving the solenoid valve's operational stability.

[0027] Compared with the prior art, the present invention has the following beneficial effects: Firstly, the external design of the magnetic circuit structure significantly reduces the size and weight of the solenoid valve. By placing the magnetic yoke structure outside the coil assembly, instead of being encapsulated, an external closed magnetic flux path is constructed, improving magnetic flux utilization while avoiding redundant space and assembly interference caused by traditional built-in magnetic yoke structures, effectively adapting to compact application scenarios.

[0028] Secondly, the magnetic flux path design is flexible and can adapt to different magnetic layouts. The yoke structure is a magnetic conductor, which can be flexibly arranged according to the actual positions of the fixed magnetic core and armature to achieve efficient magnetic connection and closed magnetic flux loop. It does not rely on axial arrangement or specific shape, which enhances the degree of design freedom, facilitates universal integration in diverse solenoid valve structures, improves driving efficiency and reduces energy consumption.

[0029] Third, the assembly methods are diversified, improving the convenience of maintenance and module compatibility. The magnetic yoke structure supports various assembly forms such as threaded connection, snap connection, plug-in fit and glued connection. It can be freely selected according to the actual structure, supports disassembly and maintenance operations, avoids the replacement of the whole machine, and improves the adaptability of on-site engineering and the economy of life cycle.

[0030] Fourth, the valve body structure balances weight reduction and engineering functionality. It features a streamlined design with rounded corners and grooves to create a lightweight structure. This structure not only helps reduce material usage and processing costs but also provides good stress distribution under impact and vibration conditions, effectively improving valve body strength and structural stability.

[0031] Fifth, it has a reset function to ensure self-reset capability in case of fault. The movable valve integrates a spring-type reset mechanism, which can automatically reset to the closed state in the event of power failure or abnormal conditions, ensuring system safety and making it suitable for scenarios requiring power failure protection. Attached Figure Description

[0032] Figure 1 This is a schematic diagram of the solenoid valve with an external magnetic yoke as described in this application.

[0033] The following detailed description, in conjunction with the accompanying drawings, will further illustrate this utility model.

[0034] Explanation of main component symbols Valve body 10; External threaded interface 11; Groove 12; Movable valve 20; Magnetic yoke structure 30. Detailed Implementation

[0035] Example: In addition, the magnetic flux path needs to be closed through the internally wound coil and the metal shell, resulting in large magnetic flux loss. To compensate for the performance deficiency, the coil power has to be increased, which further increases the overall energy consumption and heat generation, limiting its application adaptability in high-response, small-size, and highly integrated scenarios.

[0036] To address the aforementioned issues, the applicant recognized the need to develop an electromagnetic drive component solution with higher magnetic circuit closure efficiency and a more compact and stable structure. While ensuring the integrity of the magnetic flux path closure, the yoke structure 30 should be placed outside the coil module as much as possible to free up coil packaging space, optimize heat dissipation, achieve robust integration of the solenoid valve body, and balance magnetic conductivity with engineering maintainability.

[0037] Therefore, as Figure 1 As shown, this application proposes a solenoid valve with an external magnetic yoke, comprising: Valve body 10 has inlet and outlet channels for fluid flow control; A movable valve element 20 is disposed at a valve seat position between the channels; An electromagnetic drive assembly is used to drive the movable valve 20 to open or close the channel at the valve seat; The magnetic yoke structure 30 is disposed in the external space of the electromagnetic drive assembly, is not covered by the coil package of the electromagnetic drive assembly, and forms a closed magnetic flux path with the magnetic part of the electromagnetic drive assembly, thereby reducing the overall size and weight of the solenoid valve while ensuring the effectiveness of the magnetic circuit.

[0038] Compared with existing technologies, the magnetic yoke structure of traditional solenoid valves is mostly encapsulated inside the coil or integrated with the coil in a closed housing. The magnetic flux path is limited by the shape of the coil and the internal space layout, which can easily lead to magnetic field diffusion and increased magnetic resistance, thereby reducing the driving efficiency. At the same time, the overall structure is large in size, which is not conducive to miniaturization design and heat dissipation.

[0039] This application sets the magnetic yoke structure 30 in the external space of the electromagnetic drive assembly, avoiding the area occupied by the coil package, and forms an independent and efficient magnetic flux closed path. This achieves the goal of ensuring the effectiveness of the magnetic circuit and the output of driving force while effectively compressing the overall size and weight of the solenoid valve, improving the flexibility of the structural layout and the ease of assembly. It is suitable for fluid control systems with limited space or high requirements for response speed.

[0040] The electromagnetic drive assembly includes a coil, a fixed magnetic core, and an armature that forms a magnetic circuit with the fixed magnetic core.

[0041] Compared with existing technologies, the layout of magnetic components in traditional electromagnetic drive structures has problems such as low space utilization, unstable magnetic flux path, and slow response speed. Especially in small solenoid valves, it is often difficult to balance drive efficiency and volume control.

[0042] This application designs the electromagnetic drive component to include a coil, a fixed magnetic core, and an armature that forms a magnetic circuit with the fixed magnetic core. This achieves optimized magnetic field distribution and improved electromagnetic response efficiency while maintaining magnetic circuit continuity and stable driving force output. As a result, it improves the overall opening / closing speed and energy efficiency ratio of the solenoid valve, making it suitable for more working environments with high requirements for fast response and miniaturization.

[0043] The magnetic yoke structure 30 is a magnetic conductor, and its two ends are magnetically connected to the fixed magnetic core and / or armature respectively to form a complete return magnetic flux path.

[0044] Compared with existing technologies, the magnetic yoke structure 30 in traditional solenoid valves is usually nested or encapsulated inside the coil, resulting in a complex magnetic flux path and severe demagnetization, which in turn affects the stability of the electromagnetic force output and the compactness of the overall structure.

[0045] This application designs the magnetic yoke structure 30 as a magnetic conductor and magnetically connects its two ends to a fixed magnetic core and / or armature, respectively, thereby realizing the construction of a complete closed path for magnetic flux, reducing magnetic resistance, improving magnetic circuit efficiency, and avoiding the magnetic loss problem caused by limited packaging space in traditional structures. It also improves response performance while optimizing the overall size control and assembly convenience.

[0046] The magnetic yoke structure 30 is made of a soft magnetic material, preferably including pure iron, silicon steel or soft magnetic stainless steel.

[0047] Compared with existing technologies, the yoke of traditional solenoid valves is mostly made of ordinary low-carbon steel or iron-based composite materials, which have low magnetic permeability, large hysteresis loss, and are prone to incomplete armature engagement or delayed response due to magnetic residue after long-term on / off operation.

[0048] This application uses a soft magnetic material to make a magnetic yoke structure 30, preferably using high permeability and low remanence materials such as pure iron, silicon steel or soft magnetic stainless steel. This achieves a significant reduction in magnetic energy loss and temperature rise effect while ensuring efficient magnetic circuit closure, thereby improving the driving sensitivity and response speed of the solenoid valve. It is suitable for high-frequency operation and low power consumption scenarios.

[0049] The magnetic yoke structure 30 is installed on the valve body 10 or the electromagnetic drive assembly housing by means of threaded connection, snap-fit ​​connection, plug-in fit or adhesive bonding.

[0050] Compared with existing technologies, the magnetic yoke structure in traditional solenoid valves is mostly fixed by embedding or welding, resulting in low structural integration, complex assembly, inconvenient maintenance, and is not conducive to miniaturization design or modular replacement.

[0051] This application sets the magnetic yoke structure 30 as an externally detachable component and installs it on the valve body 10 or the electromagnetic drive assembly housing using threaded connections, snap-fit ​​connections, plug-in fittings, or adhesive bonding methods. This enables the rapid assembly and flexible replacement of the magnetic yoke structure 30, which not only improves the assembly efficiency and modular adaptability of the solenoid valve, but also simplifies the structural maintenance process, which is conducive to product miniaturization and the reduction of later operation and maintenance costs.

[0052] The valve body 10 is equipped with external threaded interfaces 11 at its inlet and outlet, and can be directly connected to standard pipe fittings for easy on-site installation.

[0053] Compared with existing technologies, traditional solenoid valves often use non-standard threaded or welded connections at the installation interface, resulting in poor field adaptability, complex installation, and inconvenient maintenance.

[0054] This application enables the solenoid valve to be quickly installed, seamlessly connected, and easily disassembled in various industrial environments by setting standard external thread interfaces 11 at the inlet and outlet of the valve body 10 and supporting direct connection to standard pipe fittings, thereby significantly improving the product's versatility and engineering adaptability.

[0055] The magnetic yoke structure 30 is disposed on the outside of the coil and arranged in a manner that adapts to the position of the magnetic components, so that its magnetic conduction path is effectively coupled with the magnetic flux path generated by the coil, thereby constructing a complete magnetic flux closed loop.

[0056] Compared with existing technologies, the magnetic yoke structure of traditional solenoid valves is usually a ring or embedded type, the magnetic flux path is unstable, which can easily cause magnetic leakage or energy loss, and the electromagnetic components are relatively thick.

[0057] This application places the magnetic yoke structure 30 outside the coil and arranges it in a manner that adapts to the position of the magnetic components, so that its magnetic conduction path and the magnetic flux path generated by the coil are effectively coupled, thus constructing a complete magnetic flux closed loop. This not only avoids the constraints of space limitations on the arrangement of the magnetic yoke, but also improves the magnetic flux density and driving response capability, making it suitable for application scenarios with high requirements for structural compactness and performance stability.

[0058] The valve body 10 has a streamlined structure.

[0059] Compared with existing technologies, traditional solenoid valves typically use a straight-edged shell structure, which results in a rough overall appearance, uneven stress, and excessive weight, making it difficult to meet the requirements of miniaturization, lightweighting, or high impact resistance in application scenarios.

[0060] This application introduces a streamlined design into the structure of the valve body 10, giving the outer contour of the valve body 10 a continuous and smooth transition, effectively avoiding local stress concentration and improving overall mechanical strength. At the same time, this streamlined structure facilitates the reduction of local shell thickness while maintaining structural stability, reducing material usage and thus achieving overall weight reduction. It is suitable for installation conditions where weight and strength requirements coexist, such as vehicle control systems or mobile fluid equipment.

[0061] The valve body 10 is also provided with a longitudinal groove 12. The groove 12 is a rounded transition concave surface that extends along the outer contour of the valve body 10 and is integrally formed with the valve body 10 to reduce the overall weight and improve the streamline of the shape.

[0062] Compared with existing technologies, the valve body of traditional solenoid valves is usually a regular solid structure, which makes it difficult to meet the requirements of strength and weight reduction at the same time. In addition, the rigid shape is not conducive to subsequent structural integration and appearance optimization.

[0063] By introducing a longitudinally arranged rounded transition groove 12 on the surface of the valve body 10, the amount of material used is effectively reduced without weakening the overall strength of the valve body, thus reducing the weight of the whole machine. At the same time, the groove 12 extends along the contour of the valve body 10 and is integrally formed with the valve body 10, forming a streamlined shape with a natural transition. This helps to reduce the sharp edges and abrupt changes in the external contour, improve the visual integrity and assembly compatibility of the product, and is suitable for scenarios with special requirements for the appearance or weight of the equipment.

[0064] The movable valve 20 is also provided with a reset mechanism, which includes a spring structure for applying a reset force to the movable valve 20, and resets the movable valve 20 to the closed state when the electromagnetic drive assembly is de-energized.

[0065] Compared with existing technologies, the reset structure in traditional solenoid valves is usually hidden inside the coil, which makes maintenance complicated, and once the reset fails, the valve may be in an unsafe open state.

[0066] This application provides a reset mechanism including a spring structure on the movable valve 20, which can automatically reset the valve to the closed state when the electromagnetic drive assembly is de-energized. This achieves the goals of power failure protection, structural safety redundancy, and assembly independence, further enhancing the reliability and operational stability of the equipment.

[0067] The embodiments described above are merely illustrative of several implementations of this utility model, and while the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of this utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model patent should be determined by the appended claims.

Claims

1. A solenoid valve with an external magnetic yoke, characterized in that, include: The valve body (10) has inlet and outlet channels for fluid flow control; A movable valve (20) is disposed at a valve seat position between the channels; An electromagnetic drive assembly is used to drive the movable valve (20) to open or close the channel at the valve seat; A magnetic yoke structure (30) is disposed in the external space of the electromagnetic drive assembly, is not covered by the coil package of the electromagnetic drive assembly, and forms a magnetic flux closed path with the magnetic part of the electromagnetic drive assembly.

2. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The electromagnetic drive assembly includes a coil, a fixed magnetic core, and an armature that forms a magnetic circuit with the fixed magnetic core.

3. The solenoid valve with an external magnetic yoke as described in claim 2, characterized in that: The magnetic yoke structure (30) is a magnetic conductor, and its two ends are magnetically connected to the fixed magnetic core and / or armature respectively to form a complete return magnetic flux path.

4. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The magnetic yoke structure (30) is made of soft magnetic material.

5. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The magnetic yoke structure (30) is detachably installed on the valve body (10) or the housing of the electromagnetic drive assembly by means of threaded connection, snap-fit ​​connection, plug-in fit or adhesive bonding.

6. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The valve body (10) is provided with external threaded interfaces (11) at its inlet and outlet, and can be directly connected to standard pipe fittings.

7. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The magnetic yoke structure (30) is located on the outside of the coil and is arranged in a manner that adapts to the position of the magnetic components.

8. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The valve body (10) has a streamlined structure.

9. The solenoid valve with an external magnetic yoke as described in claim 8, characterized in that: The valve body (10) is also provided with a longitudinal groove (12) on its surface. The groove (12) is a rounded transition concave surface that extends along the outer contour of the valve body and is integrally formed with the valve body (10).

10. The solenoid valve with an external magnetic yoke as described in claim 1, characterized in that: The movable valve (20) is also provided with a reset mechanism, which includes a spring structure for applying a reset force to the movable valve (20) and resets the movable valve (20) to the closed state when the electromagnetic drive assembly is de-energized.

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