Small novel magnetic circuit control type moving coil high-frequency electromagnetic valve

Abstract

The invention aims to provide a small novel magnetic circuit control type moving coil high-frequency electromagnetic valve, and belongs to the field of electromagnetic valves. The coil connectors and the main magnetic pole are installed on the upper portion of the magnetic pole shell, the armature is installed below the main magnetic pole, the two protruding parts of the coil framework are inserted into the two coil connectors respectively, the main magnetic pole and the armature are sleeved with a cylinder of the coil framework, the magnet exciting coil is wound around the coil framework, and the permanent magnet ring is embedded between the magnetic pole shell and the coil framework. The valve head is installed below the magnetic pole shell, the top of the valve element is located below the armature, and the bottom of the valve element penetrates out of the magnetic pole shell. The excitation coil is electrified to generate a magnetic field, and the magnetic field and the permanent magnet ring form a composite magnetic field, so that the electromagnetic actuator with the structure has more sufficient magnetization intensity and smaller inductance in a high-frequency magnetic field establishment process, and the electromagnetic actuator can generate electromagnetic force more quickly. And in combination with the moving coil type structural design, the electromagnetic actuator can adapt to different valve bodies conveniently, the magnetization speed of the electromagnetic actuator is increased, and the dynamic response speed is increased.

Description

Technical Field

[0001] The present invention relates to a solenoid valve, in particular to a high-frequency solenoid valve. Background Art

[0002] Electromagnetic high-speed on-off valves have a wide range of applications, including high-precision fuel systems and digital hydraulics. As core control components, their performance directly determines the overall control accuracy and performance stability of the system. Furthermore, with the widespread adoption of related technologies, high-speed electromagnetic actuators, as core components, have become indispensable in these areas. Their rapid, high-frequency response determines the dynamic performance of the systems they support, while their energy consumption determines the system's energy efficiency, significantly impacting system control flexibility and reliability. This has become a key development direction for the foreseeable future.

[0003] At present, the defects of high energy loss and high temperature rise of high-speed switching valves have greatly reduced their reliability and control accuracy. Therefore, improving dynamic response and increasing opening and closing frequency under low energy consumption are the main development directions of small high-speed electromagnetic actuators. In the process of improving the frequency response characteristics of electromagnetic actuators, the energy loss and temperature field defects of high-speed electromagnetic actuators need to be urgently solved. Summary of the Invention

[0004] The purpose of the present invention is to provide a small novel magnetic circuit controlled moving coil high frequency solenoid valve with fast response, high frequency, low drive, low energy consumption and high reliability.

[0005] The object of the present invention is achieved like this:

[0006] The present invention relates to a small novel magnetic circuit controlled dynamic coil high-frequency solenoid valve, which is characterized in that it includes a magnetic pole shell, a main magnetic pole, a coil connector, a coil skeleton, a permanent magnet ring, an armature, a valve head, and a valve core. The upper part of the magnetic pole shell is respectively provided with a main magnetic pole hole and a coil connector hole, the main magnetic pole hole is located in the middle, the coil connector is installed in the coil connector hole, the upper part of the main magnetic pole is located in the main magnetic pole hole, the armature is installed below the main magnetic pole, the upper part of the coil skeleton is two extension parts, and the lower part of the extension part is a hollow cylinder, the two extension parts are respectively inserted into the two coil connectors, the cylinder is sleeved on the outside of the main magnetic pole and the armature, the outside of the coil skeleton is wound with an excitation coil, the permanent magnet ring is embedded between the magnetic pole shell and the coil skeleton, the valve head is installed below the magnetic pole shell, the top of the valve core is located below the armature, and the bottom of the valve core passes through the magnetic pole shell.

[0007] The present invention may also include:

[0008] 1. A disc-shaped protrusion is provided at the lower end of the main magnetic pole, on which a return spring is sleeved, and the lower end of the return spring presses against the armature.

[0009] 2. A disc-shaped protrusion is provided at the lower end of the armature, on which a first return spring is sleeved. A second return spring is provided outside the first return spring. A first platform and a second platform are provided on the inner wall of the valve head respectively. The first platform is located above the second platform. The lower part of the first return spring is against the second platform of the valve head, and the lower part of the second return spring is against the first platform of the valve head.

[0010] 3. The stiffness of the first return spring is greater than that of the second return spring.

[0011] 4. The valve core adopts the form of lower end limit, and its lower end adopts an annular sealing surface.

[0012] 5. The permanent magnet rings include two groups, which are arranged coaxially up and down and are positioned by embedding the permanent magnet ring fixing bolts.

[0013] 6. The permanent magnet ring is a parallel circular tubular structure.

[0014] 7. The permanent magnet ring is a discontinuous circular tubular structure with or without gaps.

[0015] 8. The magnetomotive force is provided by the permanent magnet ring and the excitation coil. After the excitation coil is energized, the magnetic flux path of the permanent magnet ring is the permanent magnet ring, air gap, excitation coil, coil skeleton, main magnetic pole, magnetic pole shell and then returns to the permanent magnet ring to form a closed loop. The other part of the magnetic flux generated by the permanent magnet ring passes through the path of the armature and valve head to form a closed loop again.

[0016] The advantages of the present invention are:

[0017] 1. The valve core of the present invention is directly connected to the armature by a thread, and can be adapted to a variety of different types of valve cores and nozzle structures.

[0018] 2. The present invention forms a double-loop magnetic circuit layout through the matching magnetic field of the permanent magnet ring and the excitation coil, thereby reducing the loss of magnetic field energy and improving the energy efficiency of the electromagnetic actuator.

[0019] 3. The present invention adopts a moving coil type to make the movement visible, and cooperates with a permanent magnet ring as the main excitation source, so that the electromagnetic actuator of this structure has more sufficient magnetization intensity during the high-frequency magnetic field establishment process, and the smaller inductance also enables it to generate electromagnetic force faster.

[0020] 4. The arrangement of the permanent magnet ring and the moving coil design of the present invention reduce the number of turns of the excitation coil, and the energy loss and temperature rise of the electromagnetic actuator are also controlled, which has certain advantages for the miniaturization design of the electromagnetic actuator.

[0021] 5. Another advantage of the moving coil design of the present invention is that the structure of the armature part is only to cooperate with the valve head to form a magnetic flux circuit. Its structural size can be miniaturized to a large extent, reducing the size and weight of the moving parts, and the response performance of the electromagnetic actuator can be further improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] FIG1( a ) is a schematic diagram of the structure of the present invention (inward-opening type), and FIG1( b ) is a schematic diagram of the structure of the present invention (outward-opening type);

[0023] Figure 2(a) is a schematic diagram of the main magnetic pole structure; Figure 2(b) is a schematic diagram of the magnetic pole shell structure; Figure 2(c) is a schematic diagram of the valve head structure;

[0024] Figure 3(a) is a schematic diagram of the coil skeleton structure; Figure 3(b) is a schematic diagram of the excitation coil structure; Figure 3(c) is a schematic diagram of the armature structure; Figure 3(d) is a schematic diagram of the valve core structure; Figure 3(e) is a schematic diagram of the valve core structure of different structures;

[0025] Figure 4(a) is a schematic diagram of a complete permanent magnet ring structure; Figure 4(b) is a schematic diagram of a discontinuous permanent magnet ring structure; Figure 4(c) is a schematic diagram of the arrangement of multiple permanent magnet ring structures;

[0026] Figure 5 Schematic diagram of the coil connector structure;

[0027] Figure 6(a) shows the arrangement of the return spring of an inward-opening electromagnetic actuator; Figure 6(b) shows the arrangement of the return spring of an outward-opening electromagnetic actuator;

[0028] Figure 7 Schematic diagram of the magnetic flux path of the electromagnetic actuator of the present invention in the working state.

[0029] Reference numerals: valve head 1; permanent magnet ring 2; pole housing 3; permanent magnet ring fixing bolt 4; coil fixing bolt 5, coil connector 6; main magnetic pole 7; coil skeleton 8; excitation coil 9; return spring 10; armature 11; valve core 12. DETAILED DESCRIPTION

[0030] The present invention will be described in more detail below with reference to the accompanying drawings:

[0031] In conjunction with Figures 1-7, the present invention includes a valve head 1, a permanent magnet ring 2, a pole housing 3, a permanent magnet ring fixing bolt 4, a coil fixing bolt 5, a coil connector 6, a main pole 7, a coil skeleton 8, an excitation coil 9, a return spring 10, an armature 11, and a valve core 12. The valve head 1, the pole housing 3, and the main pole 7 are the magnetic pole components that primarily constitute the magnetic circuit of the electromagnetic actuator. The coil skeleton 8, the excitation coil 9, the armature 11, and the valve core 12 are the moving parts that constitute the moving components of the electromagnetic actuator. The moving parts are coaxially assembled with the main pole 7 between the main pole 7 and the pole housing 3. The two sets of permanent magnet rings 2 are attached to the inner wall near one end of the pole housing 3 and are limited in position by the permanent magnet ring 2 fixing bolts. The lower permanent magnet ring 2 cooperates with the valve head 1 to reduce magnetic leakage of the permanent magnet ring 2, forming a dual magnetic circuit arrangement.

[0032] Figure 2 is a schematic diagram of the structure of the magnetic pole component of the electromagnetic actuator. The valve head 1 described in Figure 2(c) has an external thread on the upper end, which is assembled with the internal thread on the lower end of the magnetic pole housing 3. Two threaded holes are opened on both sides of the magnetic pole housing 3, which are used to assemble the coil fixing bolts and the permanent magnet ring fixing bolts respectively. The main magnetic pole 7 has an external thread on the upper end, which is assembled and connected with the internal thread on the upper end of the magnetic pole housing 3. The lower end is provided with a motion assembly component, including a spring 10, an armature 11 and a coil skeleton 8. The coil skeleton 8 is provided with a thread inside, which is connected with the thread set on the upper end of the armature 11 to form a common moving body. The lower end of the main magnetic pole 7 has an annular groove structure for arranging the spring.

[0033] Figure 3 is a schematic diagram of the structure of the moving parts of the electromagnetic actuator. In Figure 3 (a), the upper end of the coil skeleton 8 is provided with a terminal, and the lower end is provided with an internal thread for connecting with the external thread provided on the upper end of the armature 11. The excitation coil 9 is surrounded by the outside of the coil skeleton 8 and is limited by the bosses at both ends of the coil skeleton 8. The lead is connected to the terminal. The center of the lower end of the armature 11 has a hole and is provided with an internal thread, which is connected to the external thread on the upper end of the valve core 12. It can be changed according to the working needs of the electromagnetic actuator and the structure of the valve body.

[0034] Figure 4(a) is a schematic diagram of the permanent magnet ring structure of the electromagnetic actuator. The first embodiment of the present invention utilizes two sets of permanent magnet rings 2 connected in parallel. These rings are cylindrical with a central through-hole and two threaded holes on either side. The two rings 2 are assembled one above the other, with one upper surface abutting the pole housing and the other lower surface flush with the lower surface of the coil bobbin 8. The permanent magnet rings 2 are radially magnetized and can be configured as multiple parallel sets; they can also be configured as discontinuous rings with or without gaps; and they can also be configured as non-standard tubular structures.

[0035] Figure 5 This is a schematic diagram of the coil connector structure. The coil connector 6 is used to cooperate with the terminal at the upper end of the coil skeleton 8 to ensure that the coil of the moving coil electromagnetic actuator is energized during movement. The lower end of the connector is a cylindrical structure with an axial opening at the bottom. Two symmetrical rectangular grooves are provided on the inner surface of the hole to cooperate with the two rectangular protrusions on the terminal at the upper end of the coil skeleton 8, thereby playing a role of connection and limitation.

[0036] Figure 6(a) is a schematic diagram of the reset spring structure of an inward-opening electromagnetic actuator. This embodiment adopts this structure. The reset spring 10 is installed in the annular gap opened at the lower end of the main magnetic pole 7. The lower end of the reset spring is in contact with the upper end surface of the armature 11. The amount of expansion and contraction of the reset spring 10 after installation is determined by the amount of screwing of the armature 11 and the main magnetic pole 7.

[0037] Figure 7This is a schematic diagram of the operating principle of the electromagnetic actuator of the present invention. When the excitation coil 9 of the electromagnetic actuator is de-energized, due to the large magnetic resistance of the working air gap, the magnetic flux generated by the permanent magnet ring 2 passes through the main magnetic pole 7, the pole housing 3, the valve head 1, and the coil bobbin 8, forming a closed magnetic flux. The electromagnetic force generated at this time is insufficient to resist the spring preload of the reset spring 10, so the electromagnetic actuator does not move. When the excitation coil 9 is energized, it generates an additional magnetic flux path in addition to the original magnetic flux, increasing the magnetic flux of the magnetic circuit. The generated electromagnetic force is greater than the spring preload, and the electromagnetic actuator's moving parts begin to move. When the excitation coil 9 is de-energized again, the magnetic field dissipates. Due to the large magnetic resistance of the air gap, the electromagnetic actuator's moving parts begin to reset under the action of the spring preload.

[0038] Combined with Figure 1(b), Figure 2, Figure 3, Figure 4(a), Figure 5 , Figure 6(b), Figure 1(b) is a schematic diagram of the overall structure of one embodiment of the small permanent magnet parallel magnetic circuit controlled moving coil high-speed electromagnetic actuator of the present invention. The structure of its main electromagnetic actuator components is similar to that of the first embodiment, the difference lies in another structure of the valve core 12 shown in Figure 3(e) and another arrangement of the reset spring 10 in Figure 6(b).

[0039] The structure of the valve core 12 of another embodiment shown in FIG3(e) adopts the form of lower end limit, and its lower end adopts an annular sealing surface for limiting and optimizing the atomization condition of the injected working medium.

[0040] The return spring 10 shown in Figure 6(b) adopts springs with large and small stiffness levels. The outer end of the spring is a small stiffness spring, the upper end of which contacts the disc-shaped protrusion protruding from the armature 11, and the lower end contacts the first platform inside the valve head 1. The inner end is a large stiffness spring, the upper end of which contacts the disc-shaped protrusion protruding from the armature 11, and the lower end contacts the second platform inside the valve head 1.

[0041] Combine Figure 7 The operating principle of the electromagnetic actuator is essentially the same. When powered on, the valve core 12 moves downward due to the spring preload, in the opposite direction of the first embodiment. When powered off, the valve core 12 quickly returns upward. Due to the synergistic effect of the two springs, the electromagnetic actuator's response is improved accordingly.

[0042] By designing an electromagnetic actuator structure with multiple permanent magnet rings, the present invention improves the electromagnetic performance of the actuator under the same current excitation. Under the same requirements, the excitation of the electromagnetic actuator can be reduced, achieving low-current, low-voltage, and high-frequency operation. A moving-coil structure is designed for the electromagnetic actuator's moving parts. This structure's direct control ensures that the electromagnetic actuator has a more sufficient magnetization intensity and lower inductance during magnetic field establishment, enabling faster electromagnetic force generation and higher valve core movement frequency. To address the shortcomings of existing high-speed electromagnetic actuators, which suffer from severe energy losses and excessive temperature rise, the present invention enables small, high-speed electromagnetic actuators to operate with low energy consumption and low temperature rise.

Claims

1. A new type of small magnetic circuit controlled moving coil high frequency solenoid valve, characterized by: Including magnetic poles The outer shell, main magnetic pole, coil connector, coil skeleton, permanent magnet ring, armature, valve head, and valve core are respectively provided with a main magnetic pole hole and a coil connector hole on the upper part of the magnetic pole shell. The main magnetic pole hole is located in the middle part, and the coil connector is installed in the coil connector hole. The upper part of the main magnetic pole is located in the main magnetic pole hole, and the armature is installed below the main magnetic pole. The upper part of the coil skeleton is two extension parts, and the lower part of the extension part is a hollow cylinder. The two extension parts are respectively inserted into the two coil connectors, and the cylinder is sleeved on the outside of the main magnetic pole and the armature. The excitation coil is wound around the outside of the coil skeleton, and a permanent magnet ring is embedded between the magnetic pole shell and the coil skeleton. The valve head is installed below the magnetic pole shell, the top of the valve core is located below the armature, and the bottom of the valve core passes through the magnetic pole shell.

2. A small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1, characterized in that: A disc-shaped protrusion is provided at the lower end of the main magnetic pole, on which a return spring is sleeved, and the lower side of the return spring presses against the armature.

3. A small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1, characterized in that: A disc-shaped protrusion is provided at the lower end of the armature, on which a first return spring is sleeved, a second return spring is provided outside the first return spring, a first platform and a second platform are provided on the inner wall of the valve head respectively, the first platform is located above the second platform, the bottom of the first return spring is pressed against the second platform of the valve head, and the bottom of the second return spring is pressed against the first platform of the valve head.

4. A small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 3, characterized in that: The first return spring has a stiffness greater than that of the second return spring.

5. The small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1 is characterized by: The valve core adopts the form of lower end limit, and its lower end adopts an annular sealing surface.

6. The small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1 is characterized by: The permanent magnet rings include two groups, which are arranged coaxially up and down and are positioned by embedding the permanent magnet ring fixing bolts.

7. The small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1 is characterized by: The permanent magnet rings are parallel circular tube structures.

8. The small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1 is characterized by: The permanent magnetic ring is a discontinuous circular tubular structure with or without gaps.

9. The small-sized novel magnetic circuit controlled moving coil high-frequency solenoid valve according to claim 1 is characterized by: The magnetomotive force is provided by the permanent magnet ring and the excitation coil. When the excitation coil is energized, the magnetic flux path of the permanent magnet ring is the permanent magnet ring, air gap, excitation coil, coil skeleton, main magnetic pole, magnetic pole shell and then returns to the permanent magnet ring to form a closed loop. The other part of the magnetic flux generated by the permanent magnet ring passes through the path of the armature and valve head to form a closed loop again.

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