WO2016074109A1

WO2016074109A1 - Composite magnetic circuit double-permanent magnet electromagnet and composite magnetic circuit double-permanent magnet high-speed solenoid valve

Info

Publication number: WO2016074109A1
Application number: PCT/CN2014/001004
Authority: WO
Inventors: 范立云; 刘鹏; 马修真; 白云; 宋恩哲; 李文辉; 费红姿; 董全; 赵建辉
Original assignee: 哈尔滨工程大学; 范立云
Priority date: 2014-11-13
Filing date: 2014-11-13
Publication date: 2016-05-19
Also published as: CN106575562B; CN106575562A; KR101947298B1; KR20170080691A; JP6409131B2; JP2018502445A

Abstract

Disclosed are a composite magnetic circuit double-permanent magnet electromagnet and a composite magnetic circuit double-permanent magnet high-speed solenoid valve. The solenoid valve comprises a valve rod (1), an armature (2), a snap ring (3), a wide permanent magnet (4), an iron core (5), a coil (6), a narrow permanent magnet (7), a coil bobbin (8), a fixed nut (9), a hydraulic damping assembly (10), an initial air gap adjusting ring (13), a shell (14), a low pressure cavity (15), an armature reset spring (16), a base (18), an armature lift adjusting block (20), a limit ring (21) and an armature lift adjusting block fixed nut (22). This structure can effectively reduce the driving current of the solenoid valve, lowers the power consumption of the solenoid valve and the heating value of the coil, and raises the speed of release of the armature; and meanwhile, this structure can reduce the degree of collision during armature pickup and also oscillation when the valve is turned on, improve the precision of control over oil injection, reduce damages to limiting devices, enhance the economical efficiency of diesels and reduce emissions.

Description

Composite magnetic circuit double permanent magnet electromagnet and composite magnetic circuit double permanent magnet high speed electromagnetic valve

Technical field

The invention relates to a solenoid valve, in particular to a high speed solenoid valve for a diesel electronic fuel control system. The invention also relates to an electromagnet that is primarily used in high speed solenoid valves.

Background technique

With the continuous development of electronic control technology for diesel engines, electronically controlled fuel injection systems have become an inevitable trend to meet increasingly stringent diesel emission regulations and economic requirements. Whether it is an electronically controlled pump nozzle, a single pump, a distribution pump, or the fastest growing high pressure common rail electronically controlled fuel injection system, high speed solenoid valves are the most critical and core components to ensure their normal operation. . It precisely adjusts the opening and closing time and the length of the closing time of the control valve through the high-speed solenoid valve electromagnet to flexibly control the injection timing, fuel injection amount and fuel injection law, thereby improving the economy of the diesel engine and reducing emissions.

The dynamic response characteristics of the solenoid valve and its multi-cycle work consistency are the most important features to achieve high-precision fuel injection timing, quantitative and flexible injection rules. At present, the solenoid valve often uses a high driving voltage to generate a large current to accelerate the suction speed in the armature pull-in phase, while the pull-in holding phase uses a relatively small current to maintain, thereby speeding up the release speed of the armature, thereby improving the solenoid valve. Overall response speed. However, the large current makes the power consumption of the solenoid valve increase, the heat generated by the coil increases, and the temperature characteristics of the coil and its sealing material are put forward higher. The safety reliability and life of the solenoid valve are reduced. The main working period of the solenoid valve is long, and the current is applied for a long time. Especially in the working mode of the fuel system under the large pulse width, the action time is longer. At this time, the heat generated by the coil is greatly increased. If the maintenance current can be further reduced, the electromagnetic will be greatly improved. The safety and reliability of the valve can also speed up the release of the armature. In addition, in order to meet the high response characteristics of the electronically controlled fuel system, the conventional solenoid valve armature must be violently impacted with the valve seat or the limiting device at a large speed during the suction, and a large oscillation occurs, which affects the actual opening or closing of the control valve. At the moment, it will affect the control precision of the control injection, and the long-term work will cause damage to the valve seat or the limit device, affecting the consistency and life of the work.

An electromagnet assembly and an injection valve having the electromagnet assembly are disclosed in the patent document of the publication No. CN 102360707 A, which is provided with a magnetic core, an electromagnet coil and a cooperating with the electromagnet coil. An electromagnet assembly of a single-arm or multi-part movable armature and at least one permanent magnet, the permanent magnet being combined in the magnet core or in the armature and generating a basic magnetic flux, the basic magnetic flux being passed through the electromagnet coil Augmenting or weakening the magnetic force acting on the armature. When the coil of the electromagnet assembly is in the same direction as the polarity of the permanent magnet, the magnetic force acting on the armature is enhanced, and the armature pull-in speed is increased, but when the coil is de-energized, the basic magnetic flux generated by the permanent magnet still acts on the armature. The self-locking force is generated, which affects the release speed of the armature. The reverse voltage is used to accelerate the release speed, but the complexity of the drive control is increased, and the power consumption is increased.

Summary of the invention

It is an object of the present invention to provide a composite magnetic circuit double permanent magnet electromagnet with low power consumption, high response, and low oscillation. Another object of the present invention is to provide a composite magnetic circuit double permanent magnet high speed electromagnetic valve based on a composite magnetic circuit double permanent magnet electromagnet.

The composite magnetic circuit double permanent magnet electromagnet of the present invention comprises a core, a coil wound on the bobbin and a permanent magnet, and the iron core has an annular groove formed therein to form a main magnetic pole and a secondary magnetic pole, and the coil is embedded in the annular groove The permanent magnet includes a wide permanent magnet and a narrow permanent magnet, and the narrow permanent magnet is disposed between the main magnetic pole and the auxiliary magnetic pole of the iron core, the outer side or the inner side of the coil, and the height of the narrow permanent magnet is equal to the height of the bobbin, and the wide permanent magnet It is disposed between the main magnetic pole and the auxiliary magnetic pole and below the coil bobbin, and the lower surface of the wide permanent magnet is flush with or slightly lower than the lower surface of the iron core, and the magnetization directions of the two permanent magnets are all radial radial magnetization and polarity the same.

The composite magnetic circuit double permanent magnet electromagnet of the present invention may further comprise:

1. A stepped central hole is formed in the middle of the iron core, and a hydraulic damping assembly is disposed in the stepped central hole, and the hydraulic damping assembly comprises a piston guiding sleeve, a damping piston, a piston return spring and a damping displacement adjusting ring. The damping piston and the piston guiding sleeve are a coupling member, and the damping piston is provided with a plurality of damping holes, and the piston guiding sleeve is interference-fitted with the step center hole small hole, and the height of the piston guiding sleeve is equal to the depth of the small hole of the step center hole, the damping piston The piston return spring is pre-pressed on the damping displacement adjusting ring, and the damping displacement adjusting ring is a boss structure with a cylindrical hole at the center, and the damping displacement adjusting ring is fixedly connected with the large hole of the step center hole.

2. The wide permanent magnet and/or the narrow permanent magnet are complete magnetic rings.

3. The wide permanent magnet and/or the narrow permanent magnet are equally divided arc permanent magnets, and the equally divided arc permanent magnets are closely arranged or equally spaced.

The composite magnetic circuit double permanent magnet high-speed electromagnetic valve of the invention comprises a casing, an electromagnet, an initial air gap adjusting ring, a low pressure cavity, a base, a valve stem and an armature, a base, a low pressure cavity, an initial air gap adjusting ring and an electromagnet Arranged in the housing from bottom to top, a fixing nut is arranged on the upper part of the housing, and a high-pressure oil hole is opened in the base, and a large cylindrical hole is formed in the middle of the low-pressure cavity to form a low-pressure oil chamber, and a connecting circular hole and an oil return hole are simultaneously opened. The valve stem passes through the base and the low pressure cavity, and the lower end of the valve stem is provided with a limit ring. The armature is installed on the upper part of the valve stem, and the valve stem has a cone valve. The cone valve is located in the low pressure oil chamber and the upper part of the valve stem of the cone valve There is an armature return spring, the electromagnet is a composite magnetic circuit double permanent magnet electromagnet, and the composite magnetic circuit double permanent magnet electromagnet comprises an iron core, a coil wound around the coil bobbin and a permanent magnet, and the iron core has a ring shape The groove forms a main magnetic pole and a secondary magnetic pole, the coil is embedded in the annular groove, the permanent magnet includes a wide permanent magnet and a narrow permanent magnet, and the narrow permanent magnet is disposed between the main magnetic pole and the secondary magnetic pole of the iron core, and the coil Outside or inside, narrow permanent magnets Equal to the height of the bobbin, the wide permanent magnet is disposed between the main magnetic pole and the auxiliary magnetic pole, below the bobbin, and the lower surface of the wide permanent magnet is flush with or slightly lower than the lower surface of the iron core, and the magnetization directions of the two permanent magnets Both are radial radiation magnetization and the same polarity.

The composite magnetic circuit double permanent magnet high speed electromagnetic valve of the present invention may further comprise:

1. A stepped central hole is formed in the middle of the iron core, and a hydraulic damping assembly is disposed in the stepped central hole, and the hydraulic damping assembly comprises a piston guiding sleeve, a damping piston, a piston return spring and a damping displacement adjusting ring. Damping piston and piston guide sleeve a coupling member, the damping piston is provided with a plurality of damping holes, and the piston guiding sleeve is interference-fitted with the small hole of the step central hole. The height of the piston guiding sleeve is equal to the depth of the small hole of the step central hole, and the damping piston is pre-stressed by the piston return spring. On the damping displacement adjusting ring, the damping displacement adjusting ring is a boss structure with a cylindrical hole at the center, and the damping displacement adjusting ring is fixedly connected with the large hole of the step center hole.

2. Install the armature lift adjustment block at the bottom of the base.

3. Wide permanent magnets and/or narrow permanent magnets are complete magnetic rings or equally circular arc permanent magnets; when wide permanent magnets and/or narrow permanent magnets are arc permanent magnets, equally divided arc permanent magnets It is evenly spaced or evenly distributed.

The composite magnetic circuit double permanent magnet electromagnet of the invention and the composite magnetic circuit double permanent magnet high speed electromagnetic valve based on the composite magnetic circuit double permanent magnet electromagnet of the invention adopts the structure of the composite magnetic circuit double permanent magnet, when the coil is connected When the current is the same as the polarization direction of the permanent magnet, the magnetic flux generated by the coil is superimposed on the magnetic flux generated by the permanent magnet, passes through the armature, and can effectively shield the magnetic flux between the main and auxiliary magnetic poles, so that the axial direction acts on the armature. The electromagnetic force is increased, so that the coil driving current of the armature pull-in and pull-in holding phase can be reduced, the power consumption of the solenoid valve and the heat of the coil can be reduced; and when the coil is not energized, the magnetic flux generated by the permanent magnet is mainly in the core portion. The magnetic circuit is formed, only a very small amount of magnetic flux passes through the armature, so that it does not generate self-locking, and the composite magnetic circuit double permanent magnet structure can maintain the current reduction during the suction and hold phase, so that the release speed of the armature can be accelerated. In addition, the hydraulic damping structure is adopted, which can realize the acceleration movement of the previous section during the pick-up process of the armature and the vibration reduction of the latter section to reduce the collision duration of the closing moment. , reduce the oscillation condition when the valve is opened, improve the control precision of the fuel injection, and reduce the damage to the limiting device; and combine the initial air gap adjusting ring, the armature lift adjusting block and the damping displacement adjusting ring to the residual air gap of the armature, The motion lift and acceleration and damping distances are freely adjustable.

DRAWINGS

1 is a schematic view showing the overall structure of a composite magnetic circuit double permanent magnet high speed electromagnetic valve according to the present invention.

2(a) - 2(b) are two arrangements of the narrow permanent magnet 7 of Fig. 1, Fig. 2(a) shows that the narrow permanent magnet 7 is located outside the bobbin, and Fig. 2(b) shows that the narrow permanent magnet 7 is located. Inside the coil bobbin.

3(a)-3(c) are schematic views of three different structures of the wide permanent magnet 4 of FIG. 1, FIG. 3(a) is a complete magnetic ring; FIG. 3(b) is an equally divided arc permanent magnet and For close arrangement; Figure 3(c) is an equally divided arc permanent magnet and is evenly spaced apart.

Fig. 4 is a schematic view showing the magnetic circuit of the electromagnet when the coil is energized.

Fig. 5 is a schematic view showing the magnetic circuit when the conventional electromagnet coil is energized.

Fig. 6 is a schematic view showing the magnetic circuit of the electromagnet when the coil is not energized.

Figure 7 is a partially enlarged schematic view of the hydraulic vibration damping assembly.

Figure 8 is a top plan view of the armature lift adjustment block of Figure 1.

detailed description

The invention will now be described in more detail with reference to the accompanying drawings.

1 , 2(a) and 2(b), a first embodiment of a composite magnetic circuit double permanent magnet electromagnet of the present invention The composition includes an armature 2, a wide permanent magnet 4, an iron core 5, a coil 6, a narrow permanent magnet 7, and a coil bobbin 8. A composite magnetic circuit double permanent magnet structure is provided in the annular groove of the iron core 5, which comprises a narrow permanent magnet 7 and a wide permanent magnet 4, and the narrow permanent magnet 7 is disposed between the main magnetic pole 25 and the auxiliary magnetic pole 26 of the iron core 5, The outer side or the inner side of the bobbin 8 is adjacent to the main magnetic pole 25 or the auxiliary magnetic pole 26 with no gap therebetween, and the height of the narrow permanent magnet 7 is equal to the height of the bobbin 8; the wide permanent magnet 4 is disposed between the main magnetic pole 25 and the auxiliary magnetic pole 26. Under the coil bobbin 8, an interference fit is used between the wide permanent magnet 4 and the main magnetic pole 25 and the auxiliary magnetic pole 26, and the lower surface 12 of the wide permanent magnet 4 is flush with or slightly lower than the lower surface 11 of the iron core; The magnetization directions of the permanent magnets are all magnetized by radial radiation and have the same polarity.

Meanwhile, in conjunction with FIG. 7, a second embodiment of the composite magnetic circuit double permanent magnet electromagnet of the present invention is based on the first embodiment in which a hydrodynamic damping assembly 10 is added to the center of the core 5. The hydraulic vibration damping assembly includes a piston guide sleeve 31, a damping piston 32, a piston return spring 30, and a damping displacement adjusting ring 34. The damping piston 32 and the piston guiding sleeve 31 are a coupling member, and the damping piston 32 is provided with a plurality of damping holes 33. And uniformly distributed on the same circumference, the piston guiding sleeve 31 and the iron core 5 stepped central hole small hole interference fit, the height is equal to the iron core 5 step central hole small hole depth, the damping piston 32 is pre-stressed by the piston return spring 30 in the damping On the displacement adjusting ring 34, the damping displacement adjusting ring 34 is a boss structure with a cylindrical hole at the center, and is screwed with the large hole of the stepped central hole of the iron core 5.

3(a), 3(b) and 3(c), in the two embodiments of the composite magnetic circuit double permanent magnet electromagnet, the two permanent magnets may be a complete magnetic ring or may be equally divided. It consists of a circular arc permanent magnet or an equally divided circular permanent magnet. Figure 3 (a), Figure 3 (b), Figure 3 (c) is divided into a wide permanent magnet full magnetic ring, a three-part circular arc permanent magnet combined magnetic ring, and a three-part evenly spaced arc permanent magnet combination Magnetic ring.

1 , 2( a ) and 2 ( b ), a composition of a first embodiment of a composite magnetic circuit double permanent magnet high-speed solenoid valve based on a composite magnetic circuit double permanent magnet electromagnet according to the present invention includes a valve stem 1 , armature 2, snap ring 3, wide permanent magnet 4, iron core 5, coil 6, narrow permanent magnet 7, coil bobbin 8, fixing nut 9, initial air gap adjusting ring 13, housing 14, low pressure chamber 15, armature The return spring 16, the base 18, and the limit ring 21 are provided.

Both the armature 2 and the iron core 5 are high magnetic permeability soft magnetic materials, and the others are non-soft magnetic materials. The iron core 5 has a cylindrical shape, and its axis is aligned with the central axis of the armature 2, and has a stepped cylindrical hole at the center thereof, a large hole is tapped with a thread, and an outer side is provided with an annular groove, and the iron core is divided into a main magnetic pole 25 and a secondary magnetic pole. 26. The coil bobbin 8 is wound with a certain number of enamel-coated copper wires to form a coil 6, the radial width and the axial height of which are smaller than the width and depth of the annular groove of the iron core, respectively, and the bobbin 8 and the coil 6 are pressed together. In the annular groove. A composite magnetic circuit double permanent magnet structure is provided in the annular groove of the iron core 5, including a narrow permanent magnet 7 and a wide permanent magnet 4. The narrow permanent magnet 7 is annular, as shown in Fig. 2(a) and Fig. 2(b), which are arranged in two ways. Fig. 2(a) shows that the narrow permanent magnet 7 is located outside the bobbin 8, and the narrow permanent magnet 7 is Pressed between the auxiliary magnetic pole 26 and the bobbin 8, FIG. 2(b) shows that the narrow permanent magnet 7 is located inside the bobbin 8, and the narrow permanent magnet 7 is pressed between the main magnetic pole 25 and the bobbin 8, the narrow permanent magnet There may be a certain gap between the 7 and the bobbin 6 and may be filled with rubber or resin, but the narrow permanent magnet 7 and the secondary magnetic pole 26 or the main The magnetic poles 25 are in close contact with no gap therebetween, and the height of the narrow permanent magnets 7 and the height of the bobbin 8 are equal. The wide permanent magnet 4 is annular, and is pressed under the coil, between the main magnetic pole 25 and the auxiliary magnetic pole 26, and the interference between the wide permanent magnet 4 and the main magnetic pole 25 and the secondary magnetic pole 26 is used, and the wide permanent magnet 4 is used. The lower surface 12 is flush with or slightly below the lower surface 11 of the core. The magnetization directions of the narrow permanent magnet 7 and the wide permanent magnet 4 are both radial radiation magnetization and the same polarity. The two permanent magnets may be complete magnetic rings, or may be composed of equally divided arc permanent magnets, or equally divided arc-arc permanent magnets, as shown in Fig. 3(a), Fig. 3(b), Fig. 3(c). It is divided into a wide permanent magnet full magnetic ring, a three-part circular arc permanent magnet combined magnetic ring, and a three-part evenly spaced circular arc permanent magnet combined magnetic ring.

Meanwhile, in conjunction with FIG. 7, a second embodiment of the composite magnetic circuit double permanent magnet high speed solenoid valve of the present invention is based on the first embodiment, in which the fluid damper assembly 10 is disposed at the center of the core 5. 7 is an enlarged schematic view of the fluid damper assembly 10, including a piston guide sleeve 31, a damper piston 32, a piston return spring 30, and a damper displacement adjusting ring 34, wherein the damper piston 32 and the piston guide sleeve 31 are a coupling member, damped The piston 32 is provided with a plurality of damping holes 33 and uniformly distributed on the same circumference. The piston guiding sleeve 31 is interference-fitted with the small hole of the stepped central hole of the iron core 5, and the height thereof is equal to the depth of the small hole of the stepped central hole of the iron core 5, and the damping piston 32 The piston return spring 30 is pre-compressed on the damping displacement adjusting ring 34. The damping displacement adjusting ring 34 is a boss structure with a cylindrical hole at the center, and is connected with the large hole of the stepped central hole of the iron core 5 through different boss heights. The damping displacement adjustment ring 34 of h changes the initial distance of the damping piston 32 from the valve stem 1. The whole solenoid valve assembly is packaged in the housing 14, the valve stem 1 and the armature 2 are fixedly connected by the snap ring 3, and the valve stem 1 is provided with a cone valve 17 and a limit ring 21, and the cone valve 17 is integrated with the valve stem 1 The limit ring 21 is fixedly connected to the valve stem by an interference fit or a thread. In addition, an initial air gap adjusting ring 13 is disposed between the iron core 5 and the low pressure cavity 15; a large cylindrical hole is formed in the middle of the low pressure cavity 15 to form a low pressure oil chamber 23, and a circular hole 35 communicating with the armature chamber 36 is disposed at the same time. And a return hole 24; a high-pressure oil hole 19 is formed in the base 18, and an armature lift adjustment block 20 is disposed under the base 18, and is composed of two half-moon shaped blocks, and two symmetric holes are opened thereon, as shown in FIG. The armature lift adjustment block fixing nut 22 is fixed to the base.

4 to 6 show the excitation principle of the composite magnetic circuit double permanent magnet structure. (1) When the coil 6 is connected to a current having the same polarization direction as the permanent magnet, the main magnetic pole 25 and the yoke 29 generated by the coil are The secondary magnetic pole 26, the outer working air gap 27, the magnetic flux Ф ₃ closed by the armature 2, the inner working air gap 28, the secondary magnetic pole 26 generated by the wide permanent magnet 4, the outer working air gap 27, the armature 2, the inner working air gap 28, the magnetic flux Ф ₁ closed by the wide permanent magnet 4, the secondary magnetic pole 26 generated by the narrow permanent magnet 7, the external working air gap 27, the armature 2, the inner working air gap 28, the main magnetic pole 25, the coil bobbin 8, the coil 6 The magnetic flux Ф ₂ closed by the narrow permanent magnet 7 and the three are superimposed, so that the magnetic induction intensity at the working air gap of the armature is enhanced, and the magnetic flux leakage between the main and auxiliary magnetic poles generated when the conventional electromagnet coil is energized is effectively shielded. _7. The magnetic flux is closed without passing through the armature, so the electromagnetic force acting on the armature is increased, so that the coil driving current of the armature pull-in and pull-in phase can be reduced, and the power consumption of the solenoid valve and the heat generation of the coil are reduced. At the same time, the armature pull-in phase keeps the driving current reduced, making the line When off, the current decay faster, enhance the release rate of the armature. (2) when the coil is not energized, the magnetic flux through the secondary magnetic pole portion Ф ₅ 4 generated width of permanent magnets 26, the yoke 29, the main magnetic pole 25, a width of the permanent magnet 4 is closed, a part of [Phi] ₄ via the sub magnetic pole 26, the outer work The air gap 27, the armature 2, the inner working air gap 28, the main magnetic pole 25, and the wide permanent magnet 4 are closed, while the magnetic field generated by the wide permanent magnet 4 forces the magnetic flux Ф ₆ generated by the narrow permanent magnet 7 to pass through the secondary magnetic pole 26 and the yoke. 29. The main magnetic pole 25, the coil bobbin 8, the coil 6, and the narrow permanent magnet 7 are closed, and since the iron core is made of a high magnetic permeability material, the magnetic resistance is much smaller than the magnetic resistance at the working air gap, so Ф ₄ is also far Far less than Ф ₅ and Ф ₆ , the magnetic flux flowing through the working air gap and the armature 2 is very small, so when the coil is not energized, the armature receives little electromagnetic force, and the armature return spring preload is very small, not Produces a self-locking phenomenon.

When the coil is energized, the iron core 5 generates electromagnetic attraction force to the armature 2, and when it is sufficient to overcome the preload force of the armature return spring 16, the armature 2 drives the valve stem 1 to start to accelerate toward the iron core 5, with the air between the iron core 5 and the armature 2 The gap is reduced, the electromagnetic force is getting larger and larger, and the armature 2 is moving faster and faster. When the top end of the valve stem 1 contacts the damping piston 32, it will move together, because the damping piston 32 has a plurality of damping holes 33. The throttling occurs, the armature movement is affected by the liquid damping force, and part of the kinetic energy is converted into the liquid thermal energy and the potential of the piston return spring 30, thereby reducing the collision degree of the limit ring 21 and the armature lift regulating block 20 when the armature reaches the maximum lift, and reducing The oscillation condition when the poppet valve 17 is opened, thereby reducing the nonlinear amount of the high pressure oil discharged from the high pressure oil hole 19 into the low pressure oil chamber 23 and then discharged from the oil return hole 24, thereby improving the control precision of the injection needle valve controlled by the oil passage. Improve the accuracy of fuel injection control. At the same time, by adjusting the height of the initial air gap adjusting ring 13 of the armature, the thickness of the armature lift adjusting block 20 and the height of the damping displacement adjusting ring 34h, the residual air gap, the moving lift and the acceleration and damping distance of the armature can be freely adjusted, taking into account the solenoid valve. Response and its suction collision.

The above list is only some of the specific embodiments of the present invention. It is apparent that the present invention is not limited to the above embodiment, and many variations are possible. All modifications that can be directly derived or conceived by those of ordinary skill in the art from the disclosure of the present invention are considered to be the scope of the present invention.

Claims

A composite magnetic circuit double permanent magnet electromagnet comprising an iron core, a coil wound around the bobbin and a permanent magnet, wherein the iron core has an annular groove formed therein to form a main magnetic pole and a secondary magnetic pole, and the coil is embedded in the In the annular groove, the permanent magnet includes a wide permanent magnet and a narrow permanent magnet, and the narrow permanent magnet is disposed between the main magnetic pole and the secondary magnetic pole of the iron core, outside or inside the coil, and the height of the narrow permanent magnet is equal to the height of the bobbin. The wide permanent magnet is disposed between the main magnetic pole and the auxiliary magnetic pole and below the coil bobbin, and the lower surface of the wide permanent magnet is flush with or slightly lower than the lower surface of the iron core, and the magnetization directions of the two permanent magnets are radial radiation charging. Magnetic and the same polarity.
The composite magnetic circuit double permanent magnet electromagnet according to claim 1, wherein a central hole is opened in the middle of the iron core, and a hydraulic vibration damping assembly is disposed in the stepped central hole, and the hydraulic vibration damping The assembly comprises a piston guiding sleeve, a damping piston, a piston return spring and a damping displacement adjusting ring. The damping piston and the piston guiding sleeve are a coupling member, the damping piston is provided with a plurality of damping holes, and the piston guiding sleeve is matched with the stepped center hole small hole. The height of the piston guiding sleeve is equal to the depth of the small hole of the step center hole, and the damping piston is pre-pressed on the damping displacement adjusting ring by the piston return spring, and the damping displacement adjusting ring is a boss structure with a cylindrical hole at the center, and the damping displacement adjusting ring It is fixed to the large hole of the center hole of the step.
A composite magnetic circuit double permanent magnet electromagnet according to claim 1 or 2, wherein the wide permanent magnet and/or the narrow permanent magnet are complete magnetic rings.
The composite magnetic circuit double permanent magnet electromagnet according to claim 1 or 2, wherein the wide permanent magnet and/or the narrow permanent magnet are equally divided arc permanent magnets, and the equally divided arc permanent magnets are closely arranged or The division is evenly spaced.
Composite magnetic circuit double permanent magnet high speed electromagnetic valve, comprising shell, electromagnet, initial air gap adjusting ring, low pressure cavity, base, valve stem and armature, base, low pressure cavity, initial air gap adjusting ring, electromagnet Arranged in the housing from bottom to top, a fixing nut is arranged on the upper part of the housing, and a high-pressure oil hole is opened in the base, and a large cylindrical hole is formed in the middle of the low-pressure cavity to form a low-pressure oil chamber, and a connecting circular hole and an oil return hole are simultaneously opened. The valve stem passes through the base and the low pressure cavity, and the lower end of the valve stem is provided with a limit ring. The armature is installed on the upper part of the valve stem, and the valve stem has a cone valve. The cone valve is located in the low pressure oil chamber and the upper part of the valve stem of the cone valve An armature return spring, characterized in that: the electromagnet is a composite magnetic circuit double permanent magnet electromagnet, and the composite magnetic circuit double permanent magnet electromagnet comprises a core, a coil and a permanent magnet wound around the coil bobbin, and a core An annular groove is formed to form a main magnetic pole and a secondary magnetic pole, the coil is embedded in the annular groove, the permanent magnet comprises a wide permanent magnet and a narrow permanent magnet, and the narrow permanent magnet is disposed on the main magnetic pole and the auxiliary magnetic pole of the iron core Between, outside or inside of the coil, narrow The height of the magnet is equal to the height of the bobbin. The wide permanent magnet is disposed between the main magnetic pole and the auxiliary magnetic pole and below the bobbin. The lower surface of the wide permanent magnet is flush with or slightly lower than the lower surface of the iron core. The magnetic directions are both radial radiation magnetization and the same polarity.
The composite magnetic circuit double permanent magnet high-speed solenoid valve according to claim 5, wherein a central hole is opened in the middle of the iron core, and a hydraulic damping assembly is disposed in the stepped central hole, and the hydraulic force is reduced. The vibration assembly includes a piston guide sleeve, a damping piston, a piston return spring and a damping displacement adjusting ring, and the damping piston and the piston guiding sleeve are a coupling member, and the damping piston is provided a plurality of damping holes, the piston guiding sleeve and the stepped center hole small hole have an interference fit, the height of the piston guiding sleeve is equal to the depth of the small hole of the step center hole, and the damping piston is pre-pressed by the piston return spring on the damping displacement adjusting ring, and the damping displacement adjustment The ring has a boss structure with a cylindrical hole at the center, and the damping displacement adjusting ring is fixedly connected with the large hole of the step center hole.
The composite magnetic circuit double permanent magnet high-speed solenoid valve according to claim 5 or 6, wherein the armature lift regulating block is mounted on the lower portion of the base.
The composite magnetic circuit double permanent magnet high speed electromagnetic valve according to claim 5 or 6, wherein the wide permanent magnet and/or the narrow permanent magnet are a complete magnetic ring or an equally divided arc permanent magnet; When the magnet and/or the narrow permanent magnet are arc permanent magnets, the equally spaced arc permanent magnets are closely arranged or equally spaced.
The composite magnetic circuit double permanent magnet high speed electromagnetic valve according to claim 7, wherein the wide permanent magnet and/or the narrow permanent magnet are a complete magnetic ring or an equally divided arc permanent magnet; / When the narrow permanent magnet is a circular arc permanent magnet, the equally divided arc permanent magnets are closely arranged or equally spaced.