Normally closed large flow switch valve device

Abstract

The utility model provides a normally closed large flow switch valve device, discard traditional design through special connecting link piece connects the armature in solenoid valve and valve core, adopt more simple contact abutment mode instead, greatly save the assembly cost of valve, through two pressure springs of proper position respectively with valve core and armature abutment, replace the force of mechanical connection in prior art design, wherein the upper pressure spring is bigger than the elastic force of lower pressure spring, so when the armature is not under the action of magnetic force, the position of valve core is relatively more lower, the oil inlet and outlet hole area on valve shaft sleeve is shielded, thereby guaranteeing that the valve is closed under the condition of power failure, when power on, the magnetic force unit generates attractive force to the armature, the armature can feed to one side of the magnetic force unit under the action of magnetic force, overcome the elastic force of upper pressure spring, guarantee pressure balance when the valve works, compared with prior art, the internal structure is simplified, and the fixed connection procedure between valve core and armature is omitted.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, and more specifically, to a normally closed high-flow on / off valve device. Background Technology

[0002] An electromagnetic switching valve is a basic automation component used to control the flow or stop of fluids; it belongs to the actuator category. Electromagnetic switching valves can be used with different circuits to achieve the desired control, and are used in industrial control systems to adjust the direction, speed, and other parameters of the medium.

[0003] Solenoid valve principle: When the solenoid valve is energized, the armature, under the action of electromagnetic force, overcomes the spring force and moves towards one end of the valve core. The valve core is positioned and connected to the armature. The armature drives the valve core to move axially, thereby changing the obstruction of the inlet and outlet ports on the valve sleeve, thus opening the valve and controlling the flow of hydraulic oil. The armature and push rod are press-fitted together. The push rod adopts a "barb" structure design, which is fitted into the inner hole of the valve core. After energization, the armature moves towards the upper electrode plate, and the "barb" structure on the push rod drives the valve core to move towards the electrode plate, opening the solenoid valve core and connecting the inlet and outlet ports. After de-energization, the valve core moves away from the upper electrode plate under the action of spring force until it contacts the sealing cone surface on the valve sleeve, thus closing the solenoid valve.

[0004] The commonly used electromagnetic switching valves have relatively complex structures, with multiple functional components that realize motion control. These components work together to complete the valve function. However, due to the large number of components, the coordination between them and the assembly of each component are also quite complex, making it difficult to assemble and produce efficiently.

[0005] In summary, existing electromagnetic switching valves suffer from technical problems such as complex structure leading to low assembly efficiency. Utility Model Content

[0006] The technical problem this invention aims to solve is the low assembly efficiency caused by the complex structure of electromagnetic switching valves.

[0007] To address the aforementioned problems, this utility model provides a normally closed high-flow on / off valve device, comprising a valve housing, a magnetic unit, an armature, a valve core, and a valve bushing. Both the valve housing and the valve bushing are hollow cylindrical and their end faces are coaxially connected. The valve bushing has inlet and outlet oil holes on its peripheral wall and at its end away from the valve housing. The magnetic unit is located at the end of the valve housing away from the valve bushing. The armature is slidably disposed within the valve housing, and the valve core is slidably disposed within the valve bushing. The armature and valve core are coaxially abutted against each other. An upper pressure spring is disposed between the top of the armature and the magnetic unit. The valve core is located outside... A lower pressure spring is fitted around the circumferential wall. The two ends of the lower pressure spring abut against the protruding structures on the outer circumferential wall of the valve core and the inner circumferential wall of the valve sleeve, respectively, to press the valve core against one end of the armature. Under the combined elastic force of the upper and lower pressure springs, the valve core blocks the area of ​​the oil inlet and outlet holes on the valve sleeve. When energized, the magnetic unit generates a magnetic force to attract the armature and compress the upper pressure spring. At the same time, the valve core remains against the armature under the action of the lower pressure spring and moves axially synchronously with the armature. The valve core avoids the area of ​​the oil inlet and outlet holes on the valve sleeve, thereby opening the valve.

[0008] This utility model provides a normally closed, high-flow-rate on / off valve device. Based on a traditional structure, it optimizes the design of its main internal working mechanism. It abandons the traditional design's use of a dedicated connecting rod to connect the armature and valve core within the solenoid valve, instead employing a simpler contact contact method. This significantly reduces valve assembly costs. Specifically, two pressure springs at appropriate positions contact the valve core and armature respectively, replacing the mechanical connection force in existing designs. The upper pressure spring has a greater elastic force than the lower one. Therefore, when the armature is not subjected to magnetic force, the valve core is positioned relatively lower, blocking the inlet and outlet oil holes on the valve bushing, thus ensuring that even when power is off... When the valve is closed, the magnetic unit attracts the armature when energized. Under the action of the magnetic force, the armature can overcome the elastic force of the upper pressure spring and move towards the magnetic unit. At the same time, due to the action of the lower pressure spring, when the armature moves away, the valve core moves synchronously towards the armature under the action of the elastic force, and keeps the end face of the valve core against the armature. This ensures the correct conduction of the oil passage cavity inside the valve core and ensures pressure balance when the valve is working. Compared with the existing technology, this design simplifies the internal structure and omits the fixed connection process between the valve core and the armature, thereby greatly reducing the assembly cost and effectively solving the technical problem of low assembly efficiency caused by the complex structure of electromagnetic switching valves.

[0009] As a preferred embodiment, the magnetic unit includes an electromagnetic coil and a magnetically conductive sheet that is adjacent to and coaxially arranged with the electromagnetic coil. The magnetically conductive sheet has an upper pole plate attached to one end adjacent to the armature. The upper pole plate is cylindrical and has a protruding magnetically conductive structure integrally connected to one end face adjacent to the armature.

[0010] This design optimizes the design of the magnetic unit. The functional component that generates magnetic force when energized is the electromagnetic coil. The structure is simple and the function is stable. The structure of placing the magnetic conductive sheet and the upper pole plate close to the electromagnetic coil can fully meet the requirements of magnetic force conduction. The magnitude of the magnetic force generated when the electromagnetic coil is energized is just right to overcome the spring force to drive the armature.

[0011] As a preferred embodiment, a lower electrode plate is provided at the end of the valve housing furthest from the magnetic conductive plate. The lower electrode plate is sleeve-shaped and spaced radially at predetermined intervals around the armature. The outer peripheral wall of the lower electrode plate is in clearance fit with the inner peripheral wall of the valve housing. The lower electrode plate is used to cooperate with the upper electrode plate to guide the magnetic force of the magnetic force unit acting on the armature. This design is a further optimization based on the above technical solution. By providing a lower electrode plate opposite to the upper electrode plate, structures that directly affect the armature's magnetic force are provided at both ends of the armature's feed trajectory, ensuring the stability of the valve's position in both fully open and fully closed states.

[0012] As a preferred embodiment, the upper electrode plate has an annular protrusion on its outer edge facing the armature end, and the top of the annular protrusion is conical; the end face of the upper electrode plate has a raised electrode plate boss in the area surrounded by the annular protrusion. This design provides a preferred upper electrode plate end design, with a raised annular shape on the outer periphery of the end face, and a boss on the electrode plate within the annular space. This design reduces the contact area between the armature and the upper electrode plate, preventing the armature from still being attracted to the upper electrode plate after power is cut off.

[0013] As a preferred embodiment, both the valve core and the armature are hollow cylindrical structures, and their hollow interiors are interconnected. This design provides a preferred internal oil passage design for the valve. Both the valve core and the armature are hollow structures, and their internal hollow interiors are connected by their contact to form an oil passage. Combined with other perforated structures on the armature and valve core, this allows for spatial communication between the upper and lower parts of the armature and valve core. This ensures oil pressure balance at both ends of the valve core during its vertical movement, preventing oil pressure interference with the valve core's feed action.

[0014] As a preferred embodiment, the valve core has multiple internal oil holes evenly distributed on its peripheral wall, connecting the inner and outer spaces. This design optimizes the oil passage connection structure on the valve core, including multiple internal oil holes connecting its inner and outer parts, achieving pressure balance between the inner and outer cavities of the valve core, and together with the valve core and armature internal connection structure described above, assisting in the pressure balance within the valve.

[0015] As a preferred embodiment, the protruding structure on the outer peripheral wall of the valve core is a retaining ring integrally connected to the outer peripheral wall of the valve core. The outer edge of the retaining ring has a spacer hole for connecting the oil passage, through which the cavity between the valve core and the valve bushing is connected to the cavity inside the valve housing. Based on the above technical solution, this design, by providing a spacer hole connecting the upper and lower spaces of the retaining ring that abuts the spring, connects the space above the valve core (i.e., the space where the lower compression spring is located) with the space where the armature is located, balancing the pressure of the two cavities and ensuring that the lower compression spring can compress normally within its designated position, avoiding the influence of oil pressure.

[0016] As a preferred embodiment, the outer edges of the abutting end faces of the valve core and the armature are both provided with chamfered structures. These chamfered structures reduce the contact area between the valve core and the armature. This design provides an optimal valve core and armature mating method, reducing the contact area between the valve core and the armature by using chamfered surfaces, thereby reducing the transmission of radial forces between the armature and the valve core.

[0017] As a preferred embodiment, each of the adjacent end faces of the upper electrode plate and the armature is provided with a columnar positioning groove. The columnar positioning groove is used to position the end of the upper pressure spring. The edge of the columnar positioning groove transitions to the end face of the workpiece in a conical shape, which guides the installation of the upper pressure spring. This design mainly solves the assembly problem of the upper pressure spring. By guiding the spring end into the preset installation position through the conical surface, it facilitates the vertical installation of the spring and reduces the lateral force on the spring.

[0018] As a preferred embodiment, the lower electrode plate is integrally connected to a support plate, which extends out of the area between the valve housing and the valve bushing. The support plate is an irregularly bent plate. This design optimizes the support plate design, which is used for valve installation and fixation. The irregularly bent shape of the fixing bracket can reduce the vibration energy transmitted from vehicle body vibration to the solenoid valve. Attached Figure Description

[0019] Figure 1 A schematic diagram of the external overall structure of a normally closed high-flow-rate on / off valve device provided by this utility model; Figure 2 for Figure 1 A side cross-sectional view of a normally closed high-flow-rate on / off valve device; Figure 3 for Figure 2 A partially enlarged structural schematic diagram of the cross-section of a normally closed high-flow-rate on / off valve device; Figure 4 for Figure 1 A schematic diagram of the internal valve core and armature of a normally closed high-flow on / off valve device; in, Figures 1-4middle: 1. Valve housing; 2. Armature; 3. Valve core; 4. Valve bushing; 5. Upper electrode plate; 6. Lower electrode plate; 7. Magnetic conductor; 8. Upper pressure spring; 9. Lower pressure spring; 10. Oil inlet / outlet holes; 11. Inner oil hole; 12. Sealing ring; 13. Retaining ring; 14. Spacer oil hole; 15. Columnar positioning groove. Detailed Implementation

[0020] To make the technical means, creative features, objectives and effects of this utility model easier to understand, the present utility model will be further described below in conjunction with specific embodiments.

[0021] Before providing a detailed explanation of the working principle of this utility model, further clarification is needed regarding its description: In this description, terms such as "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing this utility model and for simplifying the description, and do not indicate or imply that the device or component 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 utility model. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0022] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, a direct connection, an indirect connection through an intermediate medium, or a welded connection between two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0023] refer to Figures 1-4 The following examples illustrate this. Figure 1 A schematic diagram of the external overall structure of a normally closed high-flow-rate on / off valve device provided by this utility model; Figure 2 for Figure 1 A side cross-sectional view of a normally closed high-flow-rate on / off valve device; Figure 3 for Figure 2 A partially enlarged structural schematic diagram of the cross-section of a normally closed high-flow-rate on / off valve device; Figure 4 for Figure 1 A schematic diagram of the internal valve core and armature of a normally closed high-flow on / off valve device.

[0024] This embodiment provides a normally closed high-flow on / off valve device, including a valve housing 1, a magnetic unit, an armature 2, a valve core 3, and a valve bushing 4. Both the valve housing 1 and the valve bushing 4 are hollow cylindrical and their end faces are coaxially connected. The peripheral wall of the valve bushing 4 and the end furthest from the valve housing 1 are provided with inlet / outlet holes 10. The magnetic unit is located at the end of the valve housing 1 furthest from the valve bushing 4. The armature 2 is slidably disposed within the valve housing 1, and the valve core 3 is slidably disposed within the valve bushing 4. The armature 2 and the valve core 3 are coaxially abutted. An upper pressure spring 8 is provided between the top of the armature 2 and the magnetic unit. The outer peripheral wall of the valve core 3 is sleeved with... A lower pressure spring 9 is provided, with its two ends abutting against the protruding structures on the outer peripheral wall of the valve core 3 and the inner peripheral wall of the valve sleeve 4, respectively, to press the valve core 3 against one end of the armature 2. Under the combined elastic force of the upper pressure spring 8 and the lower pressure spring 9, the position of the valve core 3 blocks the area of ​​the oil inlet / outlet hole 10 on the valve sleeve 4. When energized, the magnetic unit generates magnetic force to attract the armature 2 and compress the upper pressure spring 8. At the same time, the valve core 3 remains abutting against the armature 2 under the action of the lower pressure spring 9 and moves axially synchronously with the armature 2. The valve core 3 avoids the area of ​​the oil inlet / outlet hole 10 on the valve sleeve 4, thereby opening the valve.

[0025] This utility model provides a normally closed high-flow on / off valve device that optimizes the design of its main internal working mechanism based on the traditional basic structure. It abandons the traditional design of connecting the armature 2 and valve core 3 within the solenoid valve via a dedicated connecting rod, instead employing a simpler contact contact method, significantly reducing valve assembly costs. Specifically, this is achieved by two pressure springs at appropriate positions contacting the valve core 3 and armature 2 respectively, replacing the mechanical connection force in the existing design. The upper pressure spring 8 has a higher elasticity than the lower pressure spring 9, thus, when the armature 2 is not subjected to magnetic force, the valve core 3 is positioned relatively lower, blocking the inlet / outlet oil port 10 area on the valve sleeve 4, thereby ensuring that even in the event of a power outage... When the valve is closed, when energized, the magnetic unit attracts the armature 2. Under the action of the magnetic force, the armature 2 can overcome the elastic force of the upper pressure spring 8 and move towards the magnetic unit. At the same time, due to the action of the lower pressure spring 9, when the armature 2 moves away, the valve core 3 moves synchronously towards the armature 2 under the action of the elastic force, and keeps the end face of the valve core 3 against the end face of the armature 2. This ensures the correct conduction of the oil passage cavity inside the valve core 3 and ensures the pressure balance when the valve is working. Compared with the existing technology, this design simplifies the internal structure and omits the fixed connection process between the valve core 3 and the armature 2, thereby greatly reducing the assembly cost and effectively solving the technical problem of low assembly efficiency caused by the complex structure of electromagnetic switch valves.

[0026] In the solution provided in this embodiment, the magnetic unit includes an electromagnetic coil and a magnetically conductive sheet 7 that is adjacent to and coaxially arranged with the electromagnetic coil. The magnetically conductive sheet 7 has an upper pole plate 5 attached to one end of its end adjacent to the armature 2. The upper pole plate 5 is cylindrical and has a raised magnetically conductive structure integrally connected to one end face of its side adjacent to the armature 2.

[0027] The design optimizes the design of the magnetic unit. The functional component that generates magnetic force when energized is the electromagnetic coil. The structure is simple and the function is stable. The magnetic conductive sheet 7 and the upper pole plate 5 are set close to the electromagnetic coil, which can fully meet the requirements of magnetic force conduction. The magnitude of the magnetic force generated when the electromagnetic coil is energized is just right to overcome the spring force to push the armature 2.

[0028] In this embodiment, a lower electrode plate 6 is provided at the end of the valve housing 1 that is far from the magnetic conductive plate 7. The lower electrode plate 6 is sleeved around the armature 2 at predetermined radial intervals. The outer peripheral wall of the lower electrode plate 6 is in clearance fit with the inner peripheral wall of the valve housing 1. The lower electrode plate 6 is used to cooperate with the upper electrode plate 5 to guide the magnetic force of the magnetic force unit acting on the armature 2. It should be noted that a sealing ring 12 is provided between the upper electrode plate 5 and the structure of the valve housing 1 and its inner wall. This design is a further optimization based on the above technical solution. By providing a lower electrode plate 6 opposite to the upper electrode plate 5, structures that directly affect the magnetic force of the armature 2 are provided at both the upper and lower ends of the armature 2's feed trajectory, ensuring the stability of the valve's position in both fully open and fully closed states.

[0029] In the solution provided in this embodiment, an annular protrusion is provided on the outer edge of the upper electrode plate 5 facing the end of the armature 2, and the top of the annular protrusion is conical; a raised electrode plate boss is provided on the end face of the upper electrode plate 5 in the area surrounded by the annular protrusion. This design provides a preferred end design of the upper electrode plate 5, with a raised annular shape on the outer periphery of the end face, and a boss provided on the electrode plate in the space inside the annulus. This design reduces the contact area between the armature 2 and the upper electrode plate 5, and prevents the armature 2 from still being attracted to the upper electrode plate 5 after the power is turned off.

[0030] In the solution provided in this embodiment, both the valve core 3 and the armature 2 are hollow cylindrical structures, and their hollow parts are interconnected. This design provides a preferred valve internal oil circuit design. Both the valve core 3 and the armature 2 adopt hollow structures, and their hollow parts are connected by their mutual abutment to form an oil circuit. With the assistance of other hole structures on the armature 2 and the valve core 3, the upper and lower parts of the armature 2 and the valve core 3 can be connected. In this way, when the valve core 3 moves up and down, the oil pressure at both ends is balanced, avoiding interference of the valve core 3's feed action due to oil pressure.

[0031] In the solution provided in this embodiment, multiple internal oil holes 11 are evenly distributed on the peripheral wall of the valve core 3, connecting the inner and outer spaces. This design optimizes the oil passage connection structure on the valve core 3, including multiple internal oil holes 11 connecting its inner and outer parts, to achieve pressure balance between the inner and outer cavities of the valve core 3, and together with the above-described connection structure between the valve core 3 and the armature 2, it assists in balancing the internal pressure of the valve.

[0032] In the solution provided in this embodiment, the protruding structure on the outer peripheral wall of the valve core 3 is a retaining ring 13 integrally connected to the outer peripheral wall of the valve core 3. The outer edge of the retaining ring 13 is provided with an oil-separating hole 14 for connecting the oil circuit. The cavity between the valve core 3 and the valve bushing 4 is connected to the cavity inside the valve housing 1 through the oil-separating hole 14. Based on the above technical solution structure, this design provides an oil-separating hole 14 on the retaining ring 13 that abuts the spring, connecting its upper and lower spaces. This structure connects the space above the outer part of the valve core 3, i.e., the space where the lower compression spring is located, with the space where the armature 2 is located, balancing the pressure of the two cavities and ensuring that the lower compression spring 9 can be compressed normally within its set position, avoiding the influence of oil pressure.

[0033] In the solution provided in this embodiment, the outer edges of the abutting end faces of the valve core 3 and the armature 2 are both provided with chamfered structures. The chamfered structures reduce the contact area of ​​the end faces of the valve core 3 and the armature 2. This design provides a preferred way for the valve core 3 and the armature 2 to cooperate, reducing the contact area between the valve core 3 and the armature 2 by reducing the chamfered surfaces, thereby reducing the transmission of radial force between the armature 2 and the valve core 3.

[0034] In the solution provided in this embodiment, each of the adjacent end faces of the upper electrode plate 5 and the armature 2 is provided with a columnar positioning groove 15. The columnar positioning groove 15 is used to position the end of the upper pressure spring 8. The edge of the columnar positioning groove 15 transitions to the end face of the workpiece in a conical shape, which is used to guide the installation of the upper pressure spring 8. This design mainly solves the assembly problem of the upper pressure spring 8. By guiding the spring end into the preset installation position through the conical surface, it is beneficial to install the spring vertically and reduce the lateral force on the spring.

[0035] In the solution provided in this embodiment, the lower electrode plate 6 is integrally connected to a bracket plate, which extends out of the area between the valve housing 1 and the valve bushing 4. The bracket plate is an irregularly bent plate. This design optimizes the bracket plate design, which is used for valve installation and fixation. The irregularly bent shape of the fixing bracket can reduce the vibration energy transmitted from vehicle body vibration to the solenoid valve.

[0036] Although the embodiments of this utility model have been disclosed above, the scope of protection of this utility model is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this utility model, and all such changes and modifications will fall within the protection scope of this utility model.

Claims

1. A normally closed high-flow-rate on / off valve device, comprising a valve housing (1), a magnetic unit, an armature (2), a valve core (3), and a valve bushing (4), wherein the valve housing (1) and the valve bushing (4) are both hollow cylindrical and their end faces abut against each other and are coaxially connected; the peripheral wall of the valve bushing (4) and the end away from the valve housing (1) are provided with oil inlet and outlet holes (10); the magnetic unit is disposed at the end of the valve housing (1) away from the valve bushing (4); the armature (2) is slidably disposed in the valve housing (1); the valve core (3) is slidably disposed in the valve bushing (4); and the armature (2) and the valve core (3) are coaxially abut against each other, characterized in that, An upper pressure spring (8) is provided between the top of the armature (2) and the magnetic unit. A lower pressure spring (9) is sleeved on the outer peripheral wall of the valve core (3). The two ends of the lower pressure spring (9) abut against the protruding structures of the outer peripheral wall of the valve core (3) and the inner peripheral wall of the valve sleeve (4), respectively, so as to press the valve core (3) against one end of the armature (2). Under the combined elastic force of the upper pressure spring (8) and the lower pressure spring (9), the valve core (3) blocks the area of ​​the oil inlet and outlet hole (10) on the valve sleeve (4). When energized, the magnetic unit generates magnetic force to attract the armature (2) to compress the upper pressure spring (8). At the same time, the valve core (3) remains against the armature (2) under the action of the lower pressure spring (9) and moves axially synchronously with the armature (2). The valve core (3) avoids the area of ​​the oil inlet and outlet hole (10) on the valve sleeve (4), thereby realizing the opening of the valve.

2. The normally closed high-flow-rate on / off valve device according to claim 1, characterized in that, The magnetic unit includes an electromagnetic coil and a magnetic conductive sheet (7) that is adjacent to and coaxially arranged with the electromagnetic coil. The magnetic conductive sheet (7) has an upper pole plate (5) attached to one end of its end adjacent to the armature (2). The upper pole plate (5) is cylindrical and has a raised magnetic conductive structure integrally connected to one end face of its side adjacent to the armature (2).

3. The normally closed high-flow-rate on / off valve device according to claim 2, characterized in that, A lower electrode plate (6) is provided at the other end of the valve housing (1) that is far from the magnetic sheet (7). The lower electrode plate (6) is sleeved on the outside of the armature (2) at a preset radial distance. The outer peripheral wall of the lower electrode plate (6) is in clearance fit with the inner peripheral wall of the valve housing (1). The lower electrode plate (6) is used to cooperate with the upper electrode plate (5) to guide the magnetic force of the magnetic force unit acting on the armature (2).

4. The normally closed high-flow-rate on / off valve device according to claim 3, characterized in that, The upper electrode plate (5) has an annular protrusion on its outer edge facing the end of the armature (2), and the top of the annular protrusion is conical; the end face of the upper electrode plate (5) has a protruding electrode plate boss in the area surrounded by the annular protrusion.

5. The normally closed high-flow-rate on / off valve device according to claim 4, characterized in that, Both the valve core (3) and the armature (2) are hollow cylindrical structures, and their hollow parts are interconnected.

6. The normally closed high-flow-rate on / off valve device according to claim 5, characterized in that, The valve core (3) has multiple internal oil holes (11) that connect the inner and outer spaces evenly distributed on its peripheral wall.

7. The normally closed high-flow-rate on / off valve device according to claim 6, characterized in that, The protruding structure on the outer peripheral wall of the valve core (3) is a retaining ring (13) integrally connected to the outer peripheral wall of the valve core (3). The outer edge of the retaining ring (13) is provided with an oil gap hole (14) for connecting the oil circuit. The cavity between the valve core (3) and the valve bushing (4) is connected to the cavity inside the valve housing (1) through the oil gap hole (14).

8. The normally closed high-flow-rate on / off valve device according to any one of claims 3-7, characterized in that, The outer edges of the end faces of the valve core (3) and the armature (2) that abut each other are provided with a chamfered structure, which reduces the contact area of ​​the end faces of the valve core (3) and the armature (2).

9. The normally closed high-flow-rate on / off valve device according to claim 8, characterized in that, The upper electrode plate (5) and the armature (2) are each provided with a columnar positioning groove (15) on their respective adjacent end faces. The columnar positioning groove (15) is used to position the end of the upper pressure spring (8). The edge of the columnar positioning groove (15) is conically transitioned to the end face of the workpiece, which is used to guide the installation of the upper pressure spring (8).

10. The normally closed high-flow-rate on / off valve device according to claim 8, characterized in that, The lower electrode plate (6) is integrally connected to a support plate, which extends out of the area between the valve housing (1) and the valve bushing (4). The support plate is an irregularly bent plate.

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