A normally open low cost on / off valve device

Abstract

The utility model provides a kind of normally open low-cost switch valve device, the magnetic force unit for providing armature feeding power design is optimized, the coil in existing design is designed into cylindrical structure, is sleeved in armature, this design greatly reduces the axial length of switch valve, reduces the size of switch valve, adapts the design of the electromagnetic unit, the internal switch function piece is also carried out adaptive optimization, the end fixed with armature top rod is abutted with valve core end, replaces the common armature and valve core through top rod complete positioning design, since electromagnetic unit saves the axial space of switch valve whole, the space saved can be used for the special top rod cooperation design of the present application, this design can omit the special connecting structure in valve core end head setting, completely omits the installation butt joint of valve core and armature in prior art, solves the problem of existing switch valve that valve volume is big and adaptive capacity is poor.

Description

Technical Field

[0001] This utility model relates to the field of valve equipment technology, and more specifically, to a normally open, low-cost 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, disconnecting the inlet and outlet ports, achieving energized closure. 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. The valve core releases the connection between the inlet and outlet ports, allowing the solenoid valve to remain normally open when de-energized.

[0004] The commonly used electromagnetic switching valves currently 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. In addition, due to the relatively complex structure inside the valve core, the external dimensions of the valve device are relatively large, making it difficult to adapt to some application scenarios.

[0005] In summary, existing electromagnetic switching valves suffer from technical problems such as complex structure, large external dimensions, and poor adaptability to different application scenarios. Utility Model Content

[0006] The technical problem to be solved by this utility model is that existing electromagnetic switching valves have complex structures, large external dimensions, and poor adaptability to different application scenarios.

[0007] To address the aforementioned problems, this utility model provides a normally open, low-cost 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 furthest from the valve housing. 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 arranged. The magnetic unit includes an electromagnetic coil, an upper electrode plate, and a lower electrode plate for magnetic conduction. Both the upper and lower electrode plates have cylindrical structures and are coaxially distributed. The electromagnetic coil is sleeved around the upper and lower electrode plates. The cavity between the upper and lower electrode plates on the outer periphery of the plate serves as a space to accommodate the armature's feed motion. A sliding through hole is provided in the central area of ​​the lower electrode plate. A push rod protruding from the end face of the armature is coaxially connected to the end of the armature adjacent to the lower electrode plate. The push rod is clearance-fitted with the sliding through hole, and the end of the push rod abuts against the end face of the valve core. A pressure spring is sleeved on the outer peripheral wall of the valve core. The two ends of the pressure spring abut against the protruding structures on the outer peripheral wall of the valve core and the inner peripheral wall of the valve sleeve, respectively, to press the valve core against one end of the armature. The movement of the valve core within the valve sleeve is controlled by the combined action of the magnetic force of the magnetic unit and the elastic force of the pressure spring, thereby controlling the opening or closing of the oil inlet and outlet holes.

[0008] This utility model provides a normally open, low-cost switching valve device. Based on a traditional structure, it optimizes the design of the main internal working mechanism. It abandons the electromagnetic function component found in traditional designs and optimizes the magnetic unit design for providing armature feed power. The coil, which is installed at one end of the housing and armature feed space in existing designs, is designed as a cylindrical structure, fitted around the armature. This design significantly reduces the axial length and size of the switching valve, adapting to the electromagnetic unit design. The internal switching components are also optimized for adaptability. A push rod, fixed at one end to the armature, abuts against the valve core end, replacing the common design where the armature and valve core are completely positioned by the push rod. Because the electromagnetic unit saves axial space in the switching valve, this saved space... This design can be used in the special push rod mating design of this application. This design can eliminate the need for a special connection structure at the end of the valve core, completely eliminating the installation and docking of the valve core and armature in the prior art. With the assistance of the pressure spring, it can be ensured that the valve core leaves the area of ​​the closed inlet and outlet oil holes when the power is off. When the power is on, the valve core overcomes the elastic force and feeds towards the direction of the closed inlet and outlet oil holes under the thrust provided by the armature and push rod, achieving the effect of closing the valve when powered on. Compared with the traditional electromagnetic switching valve design, this design can achieve the effect of a normally open valve with a smaller electromagnetic structure design. The internal structure design of the valve is more compact, reducing the axial dimension of the valve and reducing the hydraulic resistance of the valve. It effectively solves the technical problems of large valve volume and poor adaptability to different application scenarios of existing switching valves.

[0009] As a preferred embodiment, the upper electrode plate includes an integrally connected upper cover plate and a sleeve-shaped protrusion, the sleeve-shaped protrusion protruding vertically from one end face of the upper cover plate; the lower electrode plate includes an integrally connected lower cover plate, the lower cover plate having a cylindrical boss integrally connected to one end face facing the upper electrode plate, the central area of ​​the cylindrical boss having a circular groove, and the upper and lower cover plates being respectively closedly connected to the upper and lower ends of the valve housing. This design provides a preferred electrode plate structure design. Through this special structure of the upper and lower electrode plates, firstly, it provides feed space for the armature between them, especially between the sleeve-shaped protrusion and the circular groove; secondly, the electrode plate structure assists in the magnetic force conduction of the electromagnetic unit. This specially designed electrode plate structure ensures greater magnetic force control within the recess formed by the special structure at the end of the electrode plate, making it more suitable for the design of the electromagnetic unit in the above-mentioned technical solution.

[0010] As a preferred embodiment, the outer periphery of the cylindrical boss end face of the lower electrode plate is a conical slope; the end face of the upper cover plate is provided with a frustum-shaped electrode plate boss in the region within the sleeve-shaped protrusion, and the lower electrode plate is also provided with the electrode plate boss in the region within its circular groove. This design provides a preferred electrode plate end face design, in which the outer periphery of the electrode plate end face is a raised annulus, the outer edge of which is conical, and a boss structure is provided on the electrode plate in the space within the annulus. This design reduces the contact area between the armature and the upper electrode plate, preventing the armature from still being attracted to the electrode plate after power is cut off.

[0011] As a preferred embodiment, one end of the push rod is anchored to the armature, and the other end of the push rod has an arc-shaped surface. This design optimizes the push rod structure and its connection with the armature, allowing it to abut against the valve core end face and push one end of the valve core into an arc shape to avoid wear on the valve core during operation. The other end is directly anchored to the armature, preferably through a threaded structure, resulting in a simple structure and good fit.

[0012] As a preferred embodiment, the valve sleeve has a spring mounting groove with an increased radial diameter at the end facing the valve housing. The valve core has a radially protruding retaining ring integrally connected to the outer edge of its end face facing the armature. The pressure spring is disposed within the spring mounting groove, with one end of the pressure spring abutting against the end face of the retaining ring. This design optimizes the fit and assembly between the pressure spring and the valve sleeve. A dedicated cavity for accommodating the spring is provided within the valve sleeve, and similarly, a protruding retaining ring abutting against the spring is provided on the outer peripheral wall of the valve core, ensuring the spring's stable position and consistent provision of elastic force.

[0013] As a preferred embodiment, the valve core is a hollow cylindrical structure with a closed top. Multiple valve core oil holes are evenly distributed on the sidewall of the valve core corresponding to the spring mounting groove, connecting the inner and outer spaces of the valve core. The outer edge of the retaining ring has a spacer oil hole for connecting the oil circuit. This spacer oil hole connects the inner space of the valve core to the sliding through-hole of the lower electrode plate, thereby connecting the space where the armature is located and balancing the oil pressure at both ends of the valve core. This design connects the valve core and the upper and lower ends of the armature through a perforated structure, allowing for free oil flow, balancing the oil pressure at both ends of the valve core, and ensuring the normal operation of the valve.

[0014] As a preferred embodiment, the outer peripheral wall of the armature is evenly distributed with multiple oil guide grooves. The length direction of the oil guide grooves is parallel to the axial direction of the armature and connects the two end faces of the armature. Based on the structure of the above design, this design further optimizes the oil circuit design inside the valve. By setting oil guide grooves on the outer peripheral wall of the armature to connect the spaces at the upper and lower ends of the armature, the oil pressure is balanced. This design simplifies the hole structure at the connection position between the armature and the push rod, reducing processing costs.

[0015] As a preferred embodiment, an external bracket is fixedly attached to the outer peripheral wall of the valve housing. The external bracket includes an integrally formed bonding plate and a connecting plate, wherein the bonding plate is an arc-shaped panel that matches the valve housing. This design allows the external bracket to be welded to the valve housing via the arc-shaped bonding plate, and it can be positioned at different angles with the connector, enabling flexible placement by the client. Attached Figure Description

[0016] Figure 1 A schematic diagram of the external overall structure of a normally open, low-cost switching valve device provided by this utility model; Figure 2 for Figure 1 A top view of a normally open, low-cost on / off valve device; Figure 3 for Figure 1 A side sectional view of a normally open, low-cost on / off valve device; Figure 4 for Figure 1 A schematic diagram of the internal valve core and armature of a normally open, low-cost switching valve device; in, Figures 1-4 middle: 1. Valve housing; 2. Valve bushing; 3. Armature; 4. Valve core; 5. Push rod; 6. Upper electrode plate; 7. Lower electrode plate; 8. Pressure spring; 9. Inlet and outlet oil holes; 10. Valve core oil hole; 11. Retaining ring; 12. Spacer oil hole; 13. Oil guide groove; 14. Electrode plate boss; 15. External bracket; 16. Electromagnetic coil. Detailed Implementation

[0017] 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.

[0018] 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.

[0019] 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.

[0020] refer to Figures 1-4 The following examples illustrate this. Figure 1 A schematic diagram of the external overall structure of a normally open, low-cost switching valve device provided by this utility model; Figure 2 for Figure 1 A top view of a normally open, low-cost on / off valve device; Figure 3 for Figure 1 A side sectional view of a normally open, low-cost on / off valve device; Figure 4 for Figure 1 A schematic diagram of the internal valve core and armature of a normally open, low-cost switching valve device.

[0021] This embodiment provides a normally open, low-cost on / off valve device, including a valve housing 1, a magnetic unit, an armature 3, a valve core 4, and a valve sleeve 2. Both the valve housing 1 and the valve sleeve 2 are hollow cylindrical and their end faces are coaxially connected. The peripheral wall of the valve sleeve 2 and the end furthest from the valve housing 1 are provided with oil inlet / outlet holes 9. The armature 3 is slidably disposed within the valve housing 1, and the valve core 4 is slidably disposed within the valve sleeve 2. The armature 3 and the valve core 4 are coaxially arranged. The magnetic unit includes an electromagnetic coil 16, an upper electrode plate 6, and a lower electrode plate 7. Both the upper electrode plate 6 and the lower electrode plate 7 have cylindrical structures and are coaxially distributed. The electromagnetic coil 16 is sleeved on the upper electrode plate 6 and the lower electrode plate 7. The cavity between the upper electrode plate 6 and the lower electrode plate 7 on the outer periphery serves as a space to accommodate the feed motion of the armature 3. A sliding through hole is provided in the central area of ​​the lower electrode plate 7. A push rod 5 protruding from the end face of the armature 3 is coaxially connected to the end of the lower electrode plate 7. The push rod 5 is clearance-fitted with the sliding through hole. The end of the push rod 5 abuts against the end face of the valve core 4. A pressure spring 8 is sleeved on the outer peripheral wall of the valve core 4. The two ends of the pressure spring 8 abut against the protruding structures of the outer peripheral wall of the valve core 4 and the inner peripheral wall of the valve sleeve 2, respectively, to press the valve core 4 against one end of the armature 3. The movement of the valve core 4 in the valve sleeve 2 is controlled by the synergistic action of the magnetic force of the magnetic unit and the elastic force of the pressure spring 8, so as to control the connection or closure of the oil inlet and outlet holes 9.

[0022] This utility model provides a normally open, low-cost switching valve device. Based on a traditional structure, it optimizes the design of its main internal working mechanism. It abandons the electromagnetic function component found in traditional designs and optimizes the magnetic unit design for providing feed power to the armature 3. The coil, which is installed at one end of the housing and the feed space of the armature 3 in existing designs, is designed as a cylindrical structure, fitted around the armature 3. This design significantly reduces the axial length and size of the switching valve, adapting to the electromagnetic unit design. The internal switching components are also optimized for adaptability. A push rod 5, fixed at one end to the armature 3, abuts against the end of the valve core 4, replacing the common design where the armature 3 and valve core 4 are completely positioned by the push rod 5. Because the electromagnetic unit saves axial space in the entire switching valve, this design saves… The space can be used for the special push rod 5 matching design of this application. This design can eliminate the need for a special connection structure at the end of the valve core 4, completely eliminating the installation and docking of the valve core 4 and the armature 3 in the prior art. With the assistance of the pressure spring 8, it can be ensured that the valve core 4 closes the inlet and outlet oil holes 9 when the power is off. When the power is on, the valve core 4 overcomes the elastic force and moves towards the direction of closing the inlet and outlet oil holes 9 under the thrust provided by the armature 3 and the push rod 5, achieving the effect of closing the valve when the power is on. Compared with the traditional electromagnetic switching valve design, this design can achieve the effect of a normally open valve with a smaller electromagnetic structure design. The internal structure design of the valve is more compact, the axial dimension of the valve is reduced and the hydraulic resistance of the valve is reduced. It effectively solves the technical problems of large valve volume and poor adaptability to different application scenarios of existing switching valves.

[0023] In the technical solution provided in this embodiment, the upper electrode plate 6 includes an integrally connected upper cover plate and a sleeve-shaped protrusion, the sleeve-shaped protrusion protruding vertically from one end face of the upper cover plate; the lower electrode plate 7 includes an integrally connected lower cover plate, a cylindrical boss integrally connected to one end face of the lower cover plate facing the upper electrode plate 6, a circular groove provided in the central area of ​​the end face of the cylindrical boss, and the upper cover plate and the lower cover plate respectively sealingly connected to the upper and lower ends of the valve housing 1. This design provides a preferred electrode plate structure design. Through the upper electrode plate 6 and the lower electrode plate 7 with this special structure, firstly, it can provide the armature 3 with the feeding space between the two, especially between the sleeve-shaped protrusion and the circular groove, and secondly, the structure of the electrode plate assists the magnetic force conduction of the electromagnetic unit. Through this specially designed electrode plate structure, it can ensure that a larger magnetic force control is generated in the recess formed by the special structure at the end of the electrode plate, which is more suitable for the design of the electromagnetic unit in the above technical solution.

[0024] In the technical solution provided in this embodiment, the outer periphery of the cylindrical boss end face of the lower electrode plate 7 is a conical slope; the end face of the upper cover plate is provided with a truncated cone-shaped electrode boss 14 in the area within the sleeve-shaped protrusion, and the lower electrode plate 7 is also provided with an electrode boss 14 in the area within its circular groove. This design provides a preferred electrode end face design, with the outer periphery of the end face being a conical conical annular protrusion, and a boss structure provided on the electrode plate in the space within the annulus. This design reduces the contact area between the armature 3 and the upper electrode plate 6, preventing the armature 3 from still being attracted to the electrode plate after power is cut off.

[0025] In the technical solution provided in this embodiment, one end of the push rod 5 is anchored to the armature 3, and the other end of the push rod 5 has an arc-shaped surface. This design optimizes the structure of the push rod 5 and its connection with the armature 3, so as to abut against the end face of the valve core 4 and push one end of the valve core 4 to form an arc surface, avoiding wear on the valve core 4 during operation. The other end is directly anchored to the armature 3, preferably through a threaded structure, which is simple in structure and has a good fit.

[0026] In the technical solution provided in this embodiment, the valve sleeve 2 has a spring mounting groove with an increased inner cavity at the end facing the valve housing 1. The valve core 4 has a radially protruding retaining ring 11 integrally connected to the outer edge of its end face facing the armature 3. The pressure spring 8 is disposed in the spring mounting groove, with one end of the pressure spring 8 abutting against the end face of the retaining ring 11. This design optimizes the fit and assembly between the pressure spring 8 and the valve sleeve 2. A special cavity for accommodating the spring is provided in the inner cavity of the valve sleeve 2, and similarly, a protruding retaining ring 11 abutting against the spring is provided on the outer peripheral wall of the valve core 4, ensuring that the spring position is stable and can stably provide elastic force.

[0027] In the technical solution provided in this embodiment, the valve core 4 is a hollow cylindrical structure with a closed top. Multiple valve core oil holes 10 are evenly distributed on the sidewall of the valve core 4 corresponding to the spring mounting groove, connecting the inner and outer spaces of the valve core 4. The outer edge of the retaining ring 11 is provided with a spacer oil hole 12 for connecting the oil circuit. The spacer oil hole 12 connects the inner space of the valve core 4 to the sliding through hole of the lower electrode plate 7, thereby connecting the space where the armature 3 is located and balancing the oil pressure at both ends of the valve core 4. This design connects the upper and lower ends of the valve core 4 and the armature 3 through a hole structure, allowing the oil to flow freely, balancing the oil pressure at both ends of the valve core 4, and ensuring the normal operation of the valve.

[0028] In the technical solution provided in this embodiment, multiple oil guide grooves 13 are evenly distributed on the outer peripheral wall of the armature 3. The length direction of the oil guide grooves 13 is parallel to the axial direction of the armature 3 and connects the two end faces of the armature 3. Based on the structure of the above design, this design further optimizes the oil circuit design inside the valve. By setting oil guide grooves 13 on the outer peripheral wall of the armature 3 to connect the spaces at the upper and lower ends of the armature 3, the oil pressure is balanced. This design simplifies the hole structure at the connection position between the armature 3 and the push rod 5, reducing processing costs.

[0029] In the technical solution provided in this embodiment, an external bracket 15 is fixedly attached to the outer peripheral wall of the valve housing 1. The external bracket 15 includes an integrally formed bonding plate and a connecting plate, wherein the bonding plate is an arc-shaped panel that matches the valve housing 1. This design allows the external bracket 15 to be welded to the valve housing 1 via the arc-shaped bonding plate, and it can be at different angles with the connector, enabling flexible arrangement by the client.

[0030] 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 open, low-cost switching valve device, comprising a valve housing (1), a magnetic unit, an armature (3), a valve core (4), and a valve bushing (2), wherein the valve housing (1) and the valve bushing (2) are both hollow cylindrical and their end faces abut against each other and are coaxially connected; the peripheral wall of the valve bushing (2) and the end away from the valve housing (1) are provided with oil inlet and outlet holes (9); the armature (3) is slidably disposed in the valve housing (1); the valve core (4) is slidably disposed in the valve bushing (2); the armature (3) and the valve core (4) are coaxially disposed; the magnetic unit comprises an electromagnetic coil (16), an upper electrode plate (6), and a lower electrode plate (7); characterized in that, Both the upper electrode plate (6) and the lower electrode plate (7) include a cylindrical structure and are coaxially distributed. The electromagnetic coil (16) is sleeved around the outer periphery of the upper electrode plate (6) and the lower electrode plate (7). The cavity between the upper electrode plate (6) and the lower electrode plate (7) is a space to accommodate the feed motion of the armature (3). A sliding through hole is provided in the central area of ​​the lower electrode plate (7). A push rod (5) protruding from its end face is coaxially connected to the end of the armature (3) adjacent to the lower electrode plate (7). The gap between the push rod (5) and the sliding through hole is... In conjunction with the top rod (5), the end of the push rod (5) abuts against the end face of the valve core (4). The outer peripheral wall of the valve core (4) is fitted with a pressure spring (8). The two ends of the pressure spring (8) abut against the protruding structures of the outer peripheral wall of the valve core (4) and the inner peripheral wall of the valve sleeve (2), respectively, so as to press the valve core (4) against one end of the armature (3). The movement of the valve core (4) in the valve sleeve (2) is controlled by the combined action of the magnetic force of the magnetic unit and the elastic force of the pressure spring (8), so as to control the connection or closure of the oil inlet and outlet holes (9).

2. The normally open, low-cost switching valve device according to claim 1, characterized in that, The upper electrode plate (6) includes an integrally connected upper cover plate and a sleeve-shaped protrusion, the sleeve-shaped protrusion protruding vertically from one end face of the upper cover plate; the lower electrode plate (7) includes an integrally connected lower cover plate, the lower cover plate having a cylindrical boss integrally connected to one end face of the upper electrode plate (6), the central area of ​​the end face of the cylindrical boss having a circular groove, the upper cover plate and the lower cover plate being respectively closed and connected to the upper and lower ends of the valve housing (1).

3. The normally open, low-cost switching valve device according to claim 2, characterized in that, The outer periphery of the cylindrical boss end face of the lower electrode plate (7) is a conical slope; the end face of the upper cover plate is provided with a truncated cone-shaped electrode boss (14) in the area inside the sleeve-shaped protrusion, and the lower electrode plate (7) is also provided with the electrode boss (14) in the area inside its circular groove.

4. The normally open, low-cost switching valve device according to claim 1, characterized in that, One end of the top rod (5) is anchored to the armature (3), and the other end of the top rod (5) has an arc-shaped surface.

5. The normally open, low-cost switching valve device according to any one of claims 2-4, characterized in that, The valve bushing (2) has an opening at one end facing the valve housing (1) with a spring mounting groove whose inner cavity is radially enlarged. The valve core (4) has a radially protruding retaining ring (11) integrally connected to the outer edge of the end face facing the armature (3). The pressure spring (8) is disposed in the spring mounting groove, and one end of the pressure spring (8) abuts against the end face of the retaining ring (11).

6. The normally open, low-cost switching valve device according to claim 5, characterized in that, The valve core (4) is a hollow cylindrical structure with a closed top. The side wall of the valve core (4) has a plurality of valve core oil holes (10) that connect the inner and outer spaces of the valve core (4) evenly distributed on the wall surface corresponding to the spring mounting groove. The outer edge of the retaining ring (11) is provided with an interval oil hole (12) for connecting the oil circuit. The inner space of the valve core (4) is connected to the sliding through hole of the lower electrode plate (7) through the interval oil hole (12), thereby connecting the space where the armature (3) is located and balancing the oil pressure at both ends of the valve core (4).

7. The normally open, low-cost switching valve device according to claim 6, characterized in that, The armature (3) has a plurality of oil guide grooves (13) evenly distributed on its outer peripheral wall. The length direction of the oil guide grooves (13) is parallel to the axial direction of the armature (3) and connects the two end faces of the armature (3).

8. The normally open, low-cost switching valve device according to claim 5, characterized in that, An external bracket (15) is attached to the outer peripheral wall of the valve housing (1). The external bracket (15) includes an integrally formed bonding plate and a connecting plate. The bonding plate is an arc panel that matches the valve housing (1).

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