Electromagnetic valve with valve element capable of rotating automatically and design method

Abstract

The electromagnetic valve comprises a fixed iron core, a movable iron core and a valve element assembly, a coil is wound around the outer portion of the fixed iron core, electromagnetic force is generated after the coil is powered on, the movable armature is arranged on the axis of the fixed iron core, a driving end face is formed on the side, close to the fixed iron core, of the movable armature, and the valve element assembly is arranged on the movable armature. The driving end face forms at least two electromagnetic force high-density distribution areas under the action of electromagnetic force, at least two through holes used for modulating electromagnetic force distribution are formed in the driving end face, the number of the through holes is different from that of the electromagnetic force high-density distribution areas, and the valve element assembly is in rigid connection with the movable armature. The valve element assembly rotates around the axis of the valve element assembly under the action of the movable armature. According to the electromagnetic valve, fixed-point abrasion concentrated at a certain fixed position on the inner wall of the valve body in the prior art can be converted into abrasion evenly distributed in the circumferential direction, and therefore the problem of local concentrated abrasion existing in an existing electromagnetic valve is effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of electromagnetic valves, in particular to a self-rotatable electromagnetic valve and design method. BACKGROUND

[0002] An electromagnetic valve is an actuator that uses electromagnetic force to drive the valve core to act, thereby realizing the switching or direction control of fluid passage. When the electromagnetic valve is working, the coil is energized to generate a magnetic field, which drives the armature to move the valve core along the axial direction to open or close the flow passage. Therefore, theoretically, the movement axis of the armature and the valve core should be completely parallel to the axis of the valve body to ensure that there is no jamming during the movement. However, in actual situations, due to the influence of factors such as manufacturing precision, assembly tolerance and part accumulation error, there is a small coaxiality deviation between the armature and the valve core after pressing or assembly, which causes the outer circumferential surface of the overall assembly of the armature and the valve core to continuously and intensively rub against a specific side of the inner wall of the valve body during reciprocating movement, forming "point wear". With the accumulation of the running time of the electromagnetic valve, serious scratches will be formed in the contact area, which not only increases the movement resistance and generates pollution particles, but also worsens the fit clearance, eventually significantly increasing the risk of action instability and even movement jamming of the electromagnetic valve.

[0003] In the prior art, the above problems are usually alleviated by improving the machining precision of parts and assembly process, but this will undoubtedly significantly increase the manufacturing time and cost, and it is not realistic in terms of economy and technology to achieve perfect zero-tolerance fit for mass production. SUMMARY

[0004] Therefore, the present application provides a self-rotatable electromagnetic valve and design method, which can convert the "point wear" concentrated in a fixed position on the inner wall of the valve body in the prior art into evenly distributed wear along the circumferential direction, thereby effectively improving the local concentrated wear problem of the existing electromagnetic valve.

[0005] The technical scheme adopted by the present application to solve the above technical problems is as follows: In a first aspect, the present application provides a self-rotatable electromagnetic valve, comprising: A fixed core, the fixed core is externally wound with a coil, the coil generates electromagnetic force after being energized; A movable armature is arranged on the axis of the fixed core, a driving end face is formed on the side of the movable armature close to the fixed core, the driving end face forms at least two high-density electromagnetic force distribution zones under the action of the electromagnetic force, at least two through holes for modulating the distribution of electromagnetic force are formed on the driving end face, and the number of the through holes is different from the number of the high-density electromagnetic force distribution zones, so that the movable armature generates a rotational torque around its axis after the fixed core is energized; A valve core assembly rigidly connected with the movable armature, the valve core assembly rotates around its axis under the action of the movable armature.

[0006] In some embodiments, the number of the high-density electromagnetic force distribution areas and the number of the through holes are prime numbers to each other, or the least common multiple of the two is greater than any one of the two.

[0007] In some embodiments, the plurality of through holes are uniformly distributed in the circumferential direction on the driving end surface.

[0008] In some embodiments, the valve core assembly includes an outer valve core and an inner valve core, the outer valve core is rigidly connected with the movable armature, the inner valve core is arranged inside the outer valve core, and one end of the inner valve core extends into the center of the fixed core.

[0009] In some embodiments, the outer valve core has a first cavity and a second cavity formed at both ends inside the outer valve core, the inner valve core includes a first core and a second core, one end of the first core is arranged in the first cavity, and the other end of the first core extends into the center of the fixed core, and the second core is arranged in the second cavity.

[0010] In some embodiments, a valve body is further included, and the valve body is arranged outside the valve core assembly.

[0011] In a second aspect, the application provides a design method for implementing the electromagnetic valve with a rotatable valve core according to the first aspect of the application, including the following steps: arranging the movable armature opposite to the fixed core to form a driving end surface of the movable armature; rigidly connecting a valve core assembly with the movable armature; constructing a three-dimensional simulation model of the electromagnetic valve, and identifying at least two high-density electromagnetic force distribution areas formed on the driving end surface under the energized state of the fixed core; opening through holes on the driving end surface according to the number of the high-density electromagnetic force distribution areas, the number of the through holes is at least two, and the number of the through holes is required to be different from the number of the high-density electromagnetic force distribution areas, so that the through holes break the symmetry of the electromagnetic force distribution of the driving end surface in the circumferential direction, and further make the movable armature generate a rotational torque around its axis under energization, thereby driving the valve core assembly to rotate.

[0012] In some embodiments, the number of the high-density electromagnetic force distribution areas and the number of the through holes are set to be prime numbers to each other, or the least common multiple of the two is greater than any one of the two.

[0013] In some embodiments, the specific process of opening through holes on the driving end face according to the number of electromagnetic force high-density distribution areas is as follows: a plurality of through holes are uniformly opened on the driving end face along the circumferential direction.

[0014] In some embodiments, the method further includes verifying through simulation that the rotational torque generated during one complete axial movement stroke of the movable armature-driven valve core assembly is sufficient to drive it to rotate continuously, so as to convert the radial wear and end face impact wear of the valve core assembly into uniform wear along the circumferential direction.

[0015] Compared with the prior art, the beneficial effects of the present invention mainly include: This invention provides a self-rotating solenoid valve and its design method. By creating a certain number of through holes on the driving end face of the movable armature according to the number of high-density electromagnetic force distribution areas formed when the fixed iron core is energized, and the number of through holes being different from the number of high-density electromagnetic force distribution areas, an asymmetrical electromagnetic force is formed on the driving end face. This causes the movable armature to generate a rotational torque around its axis after the fixed iron core is energized. The movable armature rotates itself while driving the valve core assembly to rotate. In this way, the radial local "fixed-point wear" concentrated at a certain fixed position in the prior art can be transformed into wear that is uniformly distributed along the circumferential direction. This measure significantly reduces the wear rate of the valve core assembly, improves the stability of the solenoid valve's motion performance and sealing durability, thereby extending the service life of the solenoid valve. Attached Figure Description

[0016] Figure 1 This diagram illustrates the theoretical kinematic relationship between the movable armature and the valve body of an existing solenoid valve. Figure 2 This diagram illustrates the actual motion relationship between the movable armature and the valve body of an existing solenoid valve. Figure 3 This is a schematic diagram of the overall structure of the solenoid valve described in this invention; Figure 4 This is an axial sectional view of the solenoid valve described in this invention; Figure 5 This is a schematic diagram of the high-density electromagnetic force distribution area formed on the driving end face and the through hole opened according to the present invention; Figure 6 This is a flowchart of the design method described in this invention; Figure 7 This is a diagram illustrating the three-dimensional simulation model constructed according to the present invention; Figure 8 This is a diagram demonstrating that the movable armature of this invention can rotate, as verified by simulation.

[0017] As shown in the figure: 1. Components; 2. Valve body; 100. Fix the iron core; 200, movable armature; 210, high-density electromagnetic force distribution area; 220, through hole; 300, Valve core assembly; 310, Outer valve core; 320, Inner valve core; 321, First core; 322, Second core; 330, Elastic element; 340, Air gap adjusting pad. Detailed Implementation

[0018] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0019] In the manufacturing of solenoid valves, the armature and valve core are connected by welding or other means to form a component 1 that can reciprocate along the valve body axis, such as... Figure 1 As shown, theoretically, the axis of motion of component 1 should be perfectly parallel to the axis of the inner cavity of valve body 2 to ensure smooth movement. However, in actual manufacturing, due to the influence of manufacturing precision, assembly tolerances, and cumulative errors of parts, component 1 after assembly of the armature and valve core exhibits coaxiality deviation, such as... Figure 2 As shown, when component 1 reciprocates, its outer circumferential surface will experience continuous and concentrated friction with a certain position on a specific side of the inner cavity wall of valve body 2, forming radial "fixed-point wear", increasing the motion resistance of component 1, and generating particulate contaminants, ultimately causing valve core jamming.

[0020] To address the aforementioned technical problems, current practices in the field primarily focus on improving part machining accuracy, assembly processes, and using more wear-resistant materials. However, this undoubtedly increases manufacturing costs significantly, and achieving perfect zero-tolerance fit is economically and technically unrealistic for mass production. Therefore, this invention provides a self-rotating solenoid valve and its design method, which can transform the "fixed-point wear" in the aforementioned problems into wear uniformly distributed along the circumferential direction, significantly reducing the wear rate of the valve core.

[0021] The implementation process of this invention is as follows: like Figures 3-5As shown, an embodiment of the present invention provides a solenoid valve with a self-rotating valve core. Its structure mainly includes a fixed iron core 100, a movable armature 200, and a valve core assembly 300. A coil is wound around the outside of the fixed iron core 100, and the coil generates electromagnetic force after being energized. The movable armature 200 is disposed on the axis of the fixed iron core 100 and spaced apart. A driving end face is formed on the side of the movable armature 200 near the fixed iron core 100. Under the action of electromagnetic force, the driving end face forms at least two electromagnetic force high-density distribution areas 210. At least two through holes 220 for modulating the distribution of electromagnetic force are opened on the driving end face, and the number of through holes 220 is different from the number of electromagnetic force high-density distribution areas 210.

[0022] The core principle of the above technical solution is to generate rotational torque by utilizing the asymmetrical distribution of the magnetic field. Specifically, after the fixed iron core 100 is energized, a magnetic field is generated in the air gap between the fixed iron core 100 and the movable armature 200. On the driving end face, the surface density of the magnetic attraction force (the force per unit area) is proportional to the square of the local magnetic flux density. The magnetic flux tends to choose the path of least magnetic resistance. The area (air) with the through hole 220 on the driving end face has extremely high magnetic resistance, which is equivalent to a "broken circuit" of the magnetic flux. The magnetic flux will bypass it, so the local magnetic attraction force in this area is almost zero. Therefore, the driving end face forms an alternating situation of magnetic attraction area (without opening) and non-magnetic attraction area (with opening), which constitutes a force couple and generates a torque that causes the movable armature 200 to rotate around its axis. Under this condition, since the number of through holes 220 and the number of electromagnetic force high-density distribution areas 210 are different, the magnetic attraction distribution on the driving end face will never be symmetrical, and a rotational torque will be continuously generated, causing the movable armature 200 to rotate continuously, thereby driving the valve core assembly 300 to rotate.

[0023] Thus, embodiments of the present invention can transform the radial local "fixed-point wear" concentrated at a certain fixed position in the prior art into wear that is uniformly distributed along the circumferential direction. This measure significantly reduces the wear rate of the valve core assembly 300, improves the stability of the solenoid valve's motion performance and sealing durability, thereby extending the service life of the solenoid valve.

[0024] Furthermore, the quantity of the high-density electromagnetic force distribution area 210 and the quantity of the through-hole 220 are either prime numbers or their least common multiple is greater than either of the values. This design ensures that the movable armature 200 needs to go through more steps during rotation to return to a similar force field posture, thereby minimizing the occurrence of a stable equilibrium point.

[0025] In this embodiment, the number of electromagnetic force high-density distribution areas 210 is 6, and the number of through holes 220 is 8.

[0026] Furthermore, the plurality of through holes 220 are evenly distributed circumferentially on the drive end face.

[0027] Furthermore, to enhance the driving capability of the driving end face, this embodiment can provide multiple sets of through holes 220. Each set of through holes 220 includes multiple through holes 220 evenly distributed along the circumference of the driving end face. The multiple sets of through holes 220 are distributed layer by layer from the center direction to the edge direction of the driving end face. By increasing the number of through holes 220, the area of ​​the through holes 220 is increased, which can significantly modulate the local magnetic field, thereby enhancing the difference in electromagnetic force between the area where the set of through holes 220 is located and the non-opening area, and ultimately improving the net residual torque.

[0028] Furthermore, the diameter of the through hole 220 located in the outer circumferential region of the drive end face can be designed to be larger than that of the through hole 220 located in the inner circumferential region of the drive end face. Opening a through hole 220 with a larger diameter in the outer circumferential region can generate a more significant electromagnetic force imbalance at this position with a longer lever arm, thereby contributing much more to the total torque than the same design at a smaller radius. This design can convert magnetic field energy into rotational mechanical energy with the highest efficiency.

[0029] Furthermore, the valve core assembly 300 includes an outer valve core 310 and an inner valve core 320. The outer valve core 310 is rigidly connected to the movable armature 200, preferably by welding. The inner valve core 320 is disposed inside the outer valve core 310, and one end of the inner valve core 320 extends into the center of the fixed iron core 100.

[0030] Furthermore, the outer valve core 310 has a first cavity and a second cavity formed at both ends, and the inner valve core 320 includes a first core 321 and a second core 322. One end of the first core 321 is disposed in the first cavity, and the other end extends into the center of the fixed iron core 100. The second core 322 is disposed in the second cavity.

[0031] Furthermore, an elastic element 330 is provided between the first core 321 and the fixed iron core 100, and the elastic element 330 is sleeved on the first core 321.

[0032] Furthermore, the first core 321 and the second core 322 are respectively connected to the fixed iron core 100 and the valve body 2 through the air gap adjustment pad 340.

[0033] Furthermore, the first core 321, the second core 322, the outer valve core 310, and the movable armature 200 are assembled and placed inside the valve body 2 to form a solenoid valve.

[0034] In addition, such as Figures 6-8As shown, an embodiment of the present invention provides a design method for implementing the self-rotating solenoid valve with a valve core provided in the above embodiment of the present invention, comprising the following steps: Step S1: The movable armature 200 is positioned opposite to the fixed iron core 100 to form the driving end face of the movable armature 200; Step S2: Rigidly connect the valve core assembly 300 to the movable armature 200; Step S3: Construct a three-dimensional simulation model of the solenoid valve and identify at least two high-density electromagnetic force distribution areas 210 formed on the drive end face when the fixed iron core 100 is energized. In this embodiment, a three-dimensional simulation model of the solenoid valve is constructed using the electromagnetic field simulation software ANSYS Maxwell. The distribution pattern of electromagnetic force on the movable armature 200 can be identified, that is, six high-density electromagnetic force distribution areas 210 are formed on the drive end face of the movable armature 200.

[0035] Step S4: Open through holes 220 on the driving end face according to the number of electromagnetic force high-density distribution areas 210. The number of through holes 220 is at least two, and the number of through holes 220 is required to be different from the number of electromagnetic force high-density distribution areas 210. In this embodiment, since there are 6 electromagnetic force high-density distribution areas 210, and the number of electromagnetic force high-density distribution areas 210 and the number of through holes 220 are set to be coprime numbers, or the least common multiple of the two is greater than either of the two values, then there are 8 through holes 220.

[0036] It should be noted that if the same number of through holes 220 as the high-density electromagnetic force distribution area 210 are opened on the drive end face, the torque generated by the electromagnetic force will reach a dynamic equilibrium position. At this time, although the movable armature 200 can rotate, it can only rotate once. Once it reaches the equilibrium position, it cannot rotate again. Therefore, this embodiment also includes: Step S5: The quantity value of the electromagnetic force high-density distribution area 210 and the quantity value of the through hole 220 are set to be coprime numbers, or the least common multiple of the two is greater than either of the two values.

[0037] This quantitative relationship is key to breaking the system's symmetrical balance and generating continuous rotational torque. The number of through holes 220 and the number of electromagnetic force high-density distribution areas 210 are either prime numbers or have a large least common multiple. This design ensures that the armature needs to go through more steps during rotation to return to a similar force field posture, thereby minimizing the occurrence of a stable equilibrium point.

[0038] Step S6, the through hole 220 is uniformly opened circumferentially on the drive end face.

[0039] Furthermore, to enhance the driving capability of the driving end face, embodiments of the present invention also include an optimized design for the through hole 220: 1. Multi-hole design within the group: The through hole 220 includes multiple groups, and the multiple groups of through holes 220 are arranged layer by layer from the center to the edge on the drive end face. Each group of through holes 220 contains multiple independent through holes 220. This method increases the total area of ​​the through holes 220, which can more significantly modulate the local magnetic field, thereby enhancing the electromagnetic force difference between the area where the through hole 220 is located and the non-opening area, and ultimately improving the net residual torque.

[0040] 2. Aperture Optimization: The through-hole 220 located in the outer circumferential region of the drive end face can be designed with a larger diameter than the through-hole 220 located in the inner circumferential region. This design is based on the following mechanical principle: the rotational torque T is equal to the product of the tangential force F and the lever arm R (i.e., the radius from the point of application of the force to the axis of rotation) (T = F × R). Opening a larger hole at the outer radius generates a more significant electromagnetic force imbalance (i.e., a larger tangential force F) at this position with a longer lever arm, thus contributing far more to the total torque than the equivalent design at a smaller radius. Therefore, this method can convert magnetic field energy into rotational mechanical energy with the highest efficiency.

[0041] Step S7, embodiments of the present invention further include verifying the performance of the illustrated structure using Maxwell, such as... Figure 8 As shown, it is ensured that the rotational torque generated during one complete axial movement stroke of the movable armature 200 driving the valve core assembly 300 can drive it to rotate continuously, so as to convert the radial wear and end face impact wear of the valve core assembly 300 into uniform wear along the circumferential direction.

[0042] When the fixed iron core 100 is energized, a magnetic field is formed in the gap between the fixed iron core 100 and the movable armature 200, which forms a driving end face on the end face of the movable armature 200 near the fixed iron core 100. Due to the through hole 220 on the driving end face, the local magnetic resistance of the driving end face is changed, so that the electromagnetic force (magnetic attraction force) is preferentially distributed in the solid area without holes.

[0043] Furthermore, since the number of electromagnetic force high-density distribution areas 210 and through holes 220 is unequal, at any given moment, through holes 220 cannot achieve complete and symmetrical alignment with electromagnetic force high-density distribution areas 210. There will always be a portion of the un-holeed area that covers more of the electromagnetic force high-density distribution area 210, while the other symmetrical portion covers less. This circumferential imbalance causes the magnetic attraction force on the movable armature 200 to generate a net tangential component, i.e., rotational torque. Under the action of this torque, the movable armature 200 moves axially toward the fixed iron core 100 while simultaneously generating rotational motion around its axis. Because the aforementioned quantitative relationship determines that there is no absolutely stable equilibrium point in the system, this rotational motion continues until the current axial movement ends.

[0044] Thus, in this embodiment, the integral moving part (equivalent to component 1 in the prior art) formed by welding the movable armature 200 and the outer valve core 310 can rotate itself while reciprocating along the axis of the valve body 2. On the one hand, the "fixed-point wear" generated between the outer valve core 310 and the inner cavity of the valve body 2 is transformed into wear that is evenly distributed along the circumferential direction. On the other hand, the "fixed-point wear" generated between the first core 321 and the end face of the outer valve core 310 is also transformed into wear that is evenly distributed along the circumferential direction. The above measures significantly reduce the wear rate of the outer valve core 310 and the first core 321, thereby suppressing the accelerated accumulation of wear of the entire valve core assembly 300, improving the stability and durability of the solenoid valve's motion performance, and extending the service life of the solenoid valve.

[0045] The specific embodiments of the present invention described above do not constitute a limitation on the scope of protection of the present invention. Any other corresponding changes and modifications made in accordance with the technical concept of the present invention should be included within the scope of protection of the claims of the present invention.

Claims

1. A solenoid valve with a self-rotating valve core, characterized in that, include: A fixed iron core, on the outside of which a coil is wound, generates electromagnetic force when the coil is energized; A movable armature is disposed on the axis of the fixed iron core. A driving end face is formed on the side of the movable armature close to the fixed iron core. The driving end face forms at least two electromagnetic force high-density distribution areas under the action of electromagnetic force. At least two through holes for modulating the distribution of electromagnetic force are opened on the driving end face, and the number of through holes is different from the number of electromagnetic force high-density distribution areas, so that the movable armature generates a rotational torque around its axis after the fixed iron core is energized. A valve core assembly, which is rigidly connected to the movable armature, and the valve core assembly rotates about its axis under the action of the movable armature.

2. The solenoid valve with a self-rotating valve core according to claim 1, characterized in that, The number of electromagnetic force high-density distribution areas and the number of through holes are prime numbers, or the least common multiple of the two is greater than either of the two values.

3. The solenoid valve with a self-rotating valve core according to claim 2, characterized in that, The plurality of through holes are evenly distributed circumferentially on the drive end face.

4. The solenoid valve with a self-rotating valve core according to claim 1, characterized in that, The valve core assembly includes an outer valve core and an inner valve core. The outer valve core is rigidly connected to the movable armature, and the inner valve core is disposed inside the outer valve core, with one end of the inner valve core extending into the center of the fixed iron core.

5. The solenoid valve with a self-rotating valve core according to claim 4, characterized in that, The outer valve core has a first cavity and a second cavity formed at both ends. The inner valve core includes a first core and a second core. One end of the first core is disposed in the first cavity, and the other end extends into the center of the fixed iron core. The second core is disposed in the second cavity.

6. The solenoid valve with a self-rotating valve core according to claim 1, characterized in that, It also includes a valve body, which is disposed outside the valve core assembly.

7. A design method for implementing a solenoid valve with a self-rotating valve core as described in any one of claims 1 to 6, characterized in that, Includes the following steps: The movable armature and the fixed iron core are arranged opposite to each other to form the driving end face of the movable armature; The valve core assembly is rigidly connected to the movable armature; A three-dimensional simulation model of the solenoid valve is constructed to identify at least two high-density electromagnetic force distribution areas formed on the drive end face when the fixed iron core is energized. Through holes are formed on the drive end face according to the number of electromagnetic force high-density distribution areas. The number of through holes is at least two, and the number of through holes is required to be different from the number of electromagnetic force high-density distribution areas. This is so that the through holes disrupt the symmetry of the electromagnetic force distribution on the drive end face in the circumferential direction, thereby causing the movable armature to generate a rotational torque around its axis when energized, which drives the valve core assembly to rotate.

8. The design method according to claim 7, characterized in that, It also includes setting the quantity of the high-density electromagnetic force distribution area and the quantity of the through holes to be coprime numbers, or the least common multiple of the two to be greater than either of the two values.

9. The design method according to claim 7, characterized in that, The specific process of opening through holes on the driving end face according to the number of electromagnetic force high-density distribution areas is as follows: multiple through holes are uniformly opened on the driving end face along the circumference.

10. The design method according to claim 7, characterized in that, It also includes verifying through simulation that the rotational torque generated during one complete axial movement stroke of the movable armature-driven valve core assembly can drive it to rotate continuously, so as to convert the radial wear and end face impact wear of the valve core assembly into uniform wear along the circumferential direction.

Images