A linear flow control valve based on main and auxiliary bipolar magnetic circuit

Abstract

The present invention discloses a linear flow control valve based on a main-auxiliary bipolar magnetic circuit, which relates to the field of valve design, including a valve body and a coil assembly located on the valve body, wherein the coil assembly also includes an annular hollow stop iron; the annular hollow stop iron is hollow inside and is coaxially fixed to the inner side of the coil; the top fixed stop iron and the annular hollow stop iron are coaxially movably connected inside and can move along the length direction of the annular hollow stop iron; the opposite end faces between the top fixed stop iron and the bottom movable armature are provided with pointed ends arranged opposite to each other, a gap is left between the two pointed ends, and both are located on the axis of the annular hollow stop iron; a force adjustment spring is connected between the two pointed ends. By adopting this scheme, the top fixed stop iron can be adjusted up and down after the valve body is assembled, so as to adjust its linear range and adjustable range by adjusting the magnetic force, thereby avoiding the wear of components and human errors caused by repeated disassembly and assembly.

Description

Technical Field

[0001] The invention relates to the field of valve design, and in particular to a linear flow control valve based on a main-auxiliary bipolar magnetic circuit. Background Art

[0002] Flow control valve is an indispensable component in the field of fluid measurement and control. At present, many small and micro flow control valves adopt direct-acting structure, such as Figure 1 As shown, the working state of the traditional direct-acting regulating valve is that when the coil is energized, the stopper A and the armature B will generate mutual attraction, and the stopper A is in a fixed state and cannot move, so the armature B moves upward to generate an upward pulling force on the special-shaped disc spring C, thereby controlling the flow area of ​​the valve port. The advantage of this structure is that it is simple and easy to manufacture.

[0003] However, the above-mentioned traditional solenoid valve can only change the adjustment range and the linear range to a small extent by changing the preload force of the special-shaped disc spring, and the adjustment method requires constant disassembly and assembly of the control valve and disassembly of the electromagnetic actuator, which leads to inconvenience in debugging and introduces wear and human errors. Moreover, the adjustable range (referring to the voltage range in which the flow rate changes with the applied voltage) of this type of flow control valve is usually around 1V, and the adjustable range is small, resulting in high requirements for the accuracy of the applied voltage. Summary of the invention

[0004] The present invention aims to solve the deficiencies of the prior art and to provide a linear flow control valve based on a main and auxiliary bipolar magnetic circuit. By adopting this solution, after the valve body is assembled, the top fixed stop iron can be adjusted up and down, thereby adjusting its linear interval and adjustable range by adjusting the magnetic force, thereby avoiding device wear and human errors caused by repeated disassembly and assembly.

[0005] The present invention is achieved through the following technical solutions:

[0006] A linear flow control valve based on a main-auxiliary bipolar magnetic circuit comprises a valve body and a coil assembly located on the valve body, wherein the coil assembly comprises a top fixed stopper, a bottom movable armature and a coil coaxially sleeved outside, and the coil assembly further comprises an annular hollow stopper;

[0007] The annular hollow stopper is hollow inside and is coaxially fixed to the inner side of the coil; the outer diameter of the bottom movable armature is larger than the inner diameter of the annular hollow stopper, and an adjustment gap is left between the lower end of the annular hollow stopper and the upper end of the bottom movable armature; the top fixed stopper is coaxially movably connected to the inside of the annular hollow stopper and can move along the length direction of the annular hollow stopper;

[0008] The opposite end faces between the top fixed stop iron and the bottom movable armature are provided with pointed ends arranged facing each other, a gap is left between the two pointed ends, and both are located on the axis of the annular hollow stop iron; a force regulating spring is connected between the two pointed ends.

[0009] Compared with the prior art, the traditional solenoid valve can only change the adjustment range and the linear range to a small extent by changing the preload force of the special-shaped disc spring, and the adjustment method requires constant disassembly and assembly of the regulating valve and disassembly of the electromagnetic actuator, which leads to inconvenience in debugging and introduces problems such as wear and human errors. The present invention provides a linear flow control valve based on a main and auxiliary bipolar magnetic circuit. By adopting this scheme, the top fixed stop iron can be adjusted up and down after the valve body is assembled, so that the linear range and adjustable range can be adjusted by adjusting the magnetic force, thereby avoiding device wear and human errors caused by repeated disassembly and assembly. The specific scheme includes a valve body and a coil assembly, wherein the coil assembly includes a coaxially arranged coil, a top fixed stop iron, a bottom movable armature and an annular hollow stop iron, the coil is located outside, and the top fixed stop iron, the bottom movable armature and the annular hollow stop iron are all located inside, so that after the coil is energized, magnetic force can be generated on the top fixed stop iron, the bottom movable armature and the annular hollow stop iron; wherein the annular hollow stop iron is hollow inside to facilitate the placement of the top fixed stop iron; the annular hollow stop iron is fixed inside the valve body by extrusion molding; the diameter of the annular hollow stop iron is substantially the same as the diameter of the bottom movable armature, and an adjustment space is left between the ends of the two. Gap, when the coil is energized, primary attraction is generated in the circumferential part of the annular hollow stop and the bottom movable armature to provide sufficient magnetic force to ensure that the bottom movable armature can move upward under the action of the primary attraction, thereby generating tension on the bottom disc spring; secondly, the opposite end faces between the top fixed stop and the bottom movable armature are provided with pointed ends arranged opposite to each other, the two pointed ends extend toward each other, and a force adjusting spring is arranged between the two, so that after the coil is energized, a secondary attraction is generated between the two pointed ends to compress the force adjusting spring, thereby jointly determining the flow area of ​​the valve port through the primary attraction and the secondary attraction. In the above scheme, since the primary attraction is constant, the secondary attraction between the two pointed ends can be adjusted directly by changing the upper and lower positions of the top fixed stop. In this way, after the valve is assembled, it is not necessary to disassemble the valve again. By directly adjusting the upper and lower positions of the top fixed stop, its linear range and adjustable range can be adjusted by adjusting the magnetic force in a targeted manner, thereby avoiding the wear of the components and human errors caused by repeated disassembly and assembly. In addition, for magnets with pointed ends, cones, etc., the magnetic field is strongest at the tip. Therefore, when using this type of magnet, the numerical value obtained from the experiment will provide more accurate results than the theoretical formula. During the adjustment process, the changes in its magnetic force and attraction are more stable. The adjustment of the present invention tends to be linear, and its linear range and adjustable range are better than those of traditional electromagnetic control valves.

[0010] As a redundancy solution, the tip portion is tapered.

[0011] In a further solution, in order to compress the lower end of the force-adjusting spring by a sufficient length, the tip portion on the bottom movable armature includes a first cylindrical section and a conical section coaxially connected from bottom to top, and the conical section extends into the inside of the annular hollow stop iron through the first cylindrical section. The first cylindrical section is long enough to extend into the inside of the annular hollow stop iron, so as to compress the force-adjusting spring. After the coil is powered off, the bottom movable armature below can be reset under the elastic force of the force-adjusting spring.

[0012] A further solution is that, in order to facilitate the assembly of the lower end of the force adjusting spring, a second cylindrical section is coaxially connected between the first cylindrical section and the conical section, and the diameter of the second cylindrical section is smaller than the diameter of the first cylindrical section; the lower end of the force adjusting spring is sleeved on the second cylindrical section.

[0013] A further solution is that in order to facilitate compressing the upper end of the force-adjusting spring by a sufficient length, the tip portion on the top fixed stop iron includes a third cylindrical section and a truncated cone section coaxially connected in sequence from top to bottom, and the diameter of the third cylindrical section is smaller than the diameter of the top fixed stop iron.

[0014] A further solution is that, in order to facilitate the assembly of the upper end of the force adjusting spring, a fourth cylindrical section is coaxially connected between the third cylindrical section and the truncated cone section, and the diameter of the fourth cylindrical section is smaller than the diameter of the third cylindrical section; the upper end of the force adjusting spring is sleeved on the fourth cylindrical section.

[0015] A further solution is that, in order to facilitate sealing the gap between the top fixed stop iron and the annular hollow stop iron, the side wall of the third cylindrical section is circumferentially opened with an annular groove, and a sealing ring is sleeved on the annular groove. The sealing ring is used to seal the gap between the outer side of the third cylindrical section and the inner side of the annular hollow stop iron.

[0016] As a further solution, as a connection method that facilitates the up and down adjustment of the top fixed stop iron, the top fixed stop iron and the annular hollow stop iron are threadedly connected.

[0017] A further solution is to use a fixed connection method for the force adjusting spring, wherein both ends of the force adjusting spring are respectively welded to the two tip portions.

[0018] A further solution is to facilitate the overall assembly of the valve body and realize an assembled connection. The upper end of the annular hollow stop iron extends out of the valve body, the outer side of the protruding part of the upper end of the annular hollow stop iron is provided with an external thread, the upper end of the annular hollow stop iron is screwed with a valve cover, and a gasket is installed between the valve cover and the annular hollow stop iron.

[0019] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0020] 1. The present invention provides a linear flow control valve based on a main and auxiliary bipolar magnetic circuit. By adopting this solution, the top fixed stop iron can be adjusted up and down after the valve body is assembled, so that its linear interval and adjustable range can be adjusted by adjusting the magnetic force, avoiding device wear and human errors caused by repeated disassembly and assembly.

[0021] 2. The present invention provides a linear flow control valve based on a main and auxiliary bipolar magnetic circuit. With this solution, for magnets with a tip, a cone, etc., the magnetic field is strongest at its tip. Therefore, using this type of magnet, the numerical value obtained by the experiment will provide a more accurate result than the theoretical formula, and the changes in its magnetic force and attraction during the adjustment process are more stable, such as Figure 4 and Figure 5 As shown in the comparison, the regulation of the present invention tends to be linear, and its linear range and adjustable range are better than those of the traditional electromagnetic regulating valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the exemplary embodiments of the present invention, the following briefly introduces the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present invention and should not be regarded as limiting the scope. For those of ordinary skill in the art, other relevant drawings can be obtained based on these drawings without creative work. In the drawings:

[0023] Figure 1 It is a structural schematic diagram of a linear flow control valve in the prior art;

[0024] Figure 2 A schematic diagram of the structure of the linear flow control valve provided by the present invention;

[0025] Figure 3 for Figure 2 The enlarged view of point A in the middle;

[0026] Figure 4 A linear diagram of the regulation range between the voltage and flow rate of a linear flow control valve in the prior art;

[0027] Figure 5 A linear diagram of the regulation range between voltage and flow in the linear flow control valve provided by the present invention.

[0028] Marks and corresponding parts names in the attached drawings:

[0029] A-stop iron, B-armature, C-special-shaped disc spring, 1-valve body, 2-top fixed stop iron, 3-bottom movable armature, 4-coil, 5-tip part, 501-first cylindrical section, 502-second cylindrical section, 503-conical section, 504-third cylindrical section, 505-fourth cylindrical section, 506-conical section, 6-force adjusting spring, 7-annular hollow stop iron, 8-sealing ring, 9-valve cover, 10-gasket, 11-disc spring. DETAILED DESCRIPTION

[0030] In order to make the objectives, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with embodiments and drawings. The exemplary embodiments of the present invention and their description are only used to explain the present invention and are not intended to limit the present invention.

[0031] Embodiment: This embodiment provides a linear flow control valve based on a main and auxiliary bipolar magnetic circuit, such as Figure 2 and Figure 3 As shown, it comprises a valve body 1 and a coil assembly located on the valve body 1, wherein the coil assembly comprises a top fixed stop iron 2, a bottom movable armature 3 and a coil 4 coaxially sleeved outside, and the coil assembly further comprises an annular hollow stop iron 7;

[0032] The annular hollow stopper 7 is hollow inside and coaxially fixed to the inner side of the coil 4; the outer diameter of the bottom movable armature 3 is larger than the inner diameter of the annular hollow stopper 7, and an adjustment gap is left between the lower end of the annular hollow stopper 7 and the upper end of the bottom movable armature 3; the top fixed stopper 2 is coaxially movably connected to the inside of the annular hollow stopper 7, and can move along the length direction of the annular hollow stopper 7;

[0033] The opposite end faces between the top fixed stop iron 2 and the bottom movable armature 3 are provided with pointed ends 5 arranged facing each other, a gap is left between the two pointed ends 5, and both are located on the axis of the annular hollow stop iron 7; a force adjusting spring 6 is connected between the two pointed ends 5.

[0034] Compared with the prior art, Figure 1As shown, the traditional solenoid valve can only change the adjustment range and the linear range to a small extent by changing the preload force of the special-shaped disc spring 11, and the adjustment method requires constant disassembly and assembly of the regulating valve and disassembly of the electromagnetic actuator, which leads to inconvenience in debugging and introduces problems such as wear and human errors. The present invention provides a linear flow control valve based on a main and auxiliary bipolar magnetic circuit. By adopting this solution, the top fixed stop iron 2 can be adjusted up and down after the valve body 1 is assembled, so that the linear range and adjustable range can be adjusted by adjusting the magnetic force, thereby avoiding device wear and human errors caused by repeated disassembly and assembly. In the specific scheme, it includes a valve body 1 and a coil assembly, and the coil assembly includes a coaxially arranged coil 4, a top fixed stop iron 2, a bottom movable armature 3 and an annular hollow stop iron 7, the coil 4 is located outside, and the top fixed stop iron 2, the bottom movable armature 3 and the annular hollow stop iron 7 are all located inside, so that after the coil 4 is energized, magnetic force can be generated on the top fixed stop iron 2, the bottom movable armature 3 and the annular hollow stop iron 7; wherein the annular hollow stop iron 7 is hollow inside to facilitate the placement of the top fixed stop iron 2; the annular hollow stop iron 7 is fixed inside the valve body 1 by extrusion molding; the diameter of the annular hollow stop iron 7 is substantially the same as the diameter of the bottom movable armature 3, and a space is left between the ends of the two. There is an adjustable gap. When the coil 4 is energized, a primary attraction is generated in the circumferential part of the annular hollow stop 7 and the bottom movable armature 3 to provide sufficient magnetic force to ensure that the bottom movable armature 3 can move upward under the action of the primary attraction, thereby generating a pulling force on the bottom disc spring 11; secondly, the opposite end faces between the top fixed stop 2 and the bottom movable armature 3 are provided with pointed ends 5 arranged in opposite directions, the two pointed ends 5 extend in opposite directions, and a force adjustment spring 6 is arranged between the two. In this way, after the coil 4 is energized, a secondary attraction is generated between the two pointed ends 5 to compress the force adjustment spring 6, thereby jointly determining the flow area of ​​the valve port through the primary attraction and the secondary attraction. In the above scheme, since the primary attraction is constant, the secondary attraction between the two pointed ends 5 can be adjusted directly by changing the upper and lower positions of the top fixed stop 2. In this way, after the valve is assembled, it is not necessary to disassemble the valve again. By directly adjusting the upper and lower positions of the top fixed stop 2, its linear range and adjustable range can be adjusted by adjusting the magnetic force in a targeted manner, thereby avoiding the wear and tear of the device and human errors caused by repeated disassembly and assembly. In addition, for magnets with a tip 5, a cone, etc., the magnetic field is strongest at its tip. Therefore, when using this type of magnet, the experimental value will provide a more accurate result than the theoretical formula, and the changes in its magnetic force and attraction are more stable during the adjustment process, such as Figure 4 and Figure 5 As shown in the comparison, the regulation of the present invention tends to be linear, and its linear range and adjustable range are better than those of the traditional electromagnetic regulating valve.

[0035] As a redundancy solution, the tip portion 5 is tapered.

[0036] In this embodiment, in order to compress the lower end of the force-adjusting spring 6 with sufficient length, the tip portion 5 on the bottom movable armature 3 includes a first cylindrical section 501 and a conical section 503 coaxially connected from bottom to top, and the conical section 503 extends into the annular hollow stop 7 through the first cylindrical section 501. The first cylindrical section 501 is long enough to extend into the annular hollow stop 7, so as to compress the force-adjusting spring 6. After the coil 4 is powered off, the bottom movable armature 3 below can be reset under the elastic force of the force-adjusting spring 6.

[0037] In this embodiment, in order to facilitate the assembly of the lower end of the force adjusting spring 6, a second cylindrical section 502 is coaxially connected between the first cylindrical section 501 and the conical section 503, and the diameter of the second cylindrical section 502 is smaller than the diameter of the first cylindrical section 501; the lower end of the force adjusting spring 6 is sleeved on the second cylindrical section 502.

[0038] In this embodiment, in order to facilitate compressing the upper end of the force-adjusting spring 6 by a sufficient length, the tip portion 5 on the top fixed stop iron 2 includes a third cylindrical segment 504 and a frustum segment 506 coaxially connected in sequence from top to bottom, and the diameter of the third cylindrical segment 504 is smaller than the diameter of the top fixed stop iron 2.

[0039] In this embodiment, in order to facilitate the assembly of the upper end of the force adjusting spring 6, a fourth cylindrical segment 505 is coaxially connected between the third cylindrical segment 504 and the truncated cone segment 506, and the diameter of the fourth cylindrical segment 505 is smaller than the diameter of the third cylindrical segment 504; the upper end of the force adjusting spring 6 is sleeved on the fourth cylindrical segment 505.

[0040] In this embodiment, in order to facilitate sealing the gap between the top fixed stop iron 2 and the annular hollow stop iron 7, an annular groove is opened in the side wall of the third cylindrical section 504, and a sealing ring 8 is sleeved on the annular groove. The sealing ring 8 is used to seal the gap between the outer side of the third cylindrical section 504 and the inner side of the annular hollow stop iron 7.

[0041] In this embodiment, as a connection mode that facilitates the up and down adjustment of the top fixed stop iron 2, the top fixed stop iron 2 and the annular hollow stop iron 7 are threadedly connected.

[0042] In this embodiment, as a fixed connection mode of the force adjusting spring 6 , both ends of the force adjusting spring 6 are respectively welded to the two tip portions 5 .

[0043] In this embodiment, in order to facilitate the overall assembly of the valve body 1 and realize the assembled connection, the upper end of the annular hollow stop iron 7 extends out of the valve body 1, and the outer side of the protruding part of the upper end of the annular hollow stop iron 7 has an external thread. The upper end of the annular hollow stop iron 7 is screwed with a valve cover 9, and a gasket 10 is installed between the valve cover 9 and the annular hollow stop iron 7.

[0044] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit, comprising a valve body (1) and a coil assembly located on the valve body (1), the coil assembly comprising a top fixed stopper (2), a bottom movable armature (3) and a coil (4) coaxially sleeved outside, characterized in that: The coil assembly also includes an annular hollow stop iron (7); The annular hollow stopper (7) is hollow inside and is coaxially fixed to the inner side of the coil (4); the outer diameter of the bottom movable armature (3) is larger than the inner diameter of the annular hollow stopper (7), and an adjustable gap is left between the lower end of the annular hollow stopper (7) and the upper end of the bottom movable armature (3); the top fixed stopper (2) and the annular hollow stopper (7) are coaxially movably connected inside and can move along the length direction of the annular hollow stopper (7); The opposite end surfaces between the top fixed stop iron (2) and the bottom movable armature (3) are provided with pointed ends (5) arranged opposite to each other, a gap is left between the two pointed ends (5), and both are located on the axis of the annular hollow stop iron (7); a force regulating spring (6) is connected between the two pointed ends (5); The tip portion (5) is conical.

2. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 1, characterized in that: The tip portion (5) on the bottom movable armature (3) comprises a first cylindrical section (501) and a conical section (503) which are coaxially connected in sequence from bottom to top, and the conical section (503) extends into the interior of the annular hollow stop iron (7) through the first cylindrical section (501).

3. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 2, characterized in that: A second cylindrical section (502) is coaxially connected between the first cylindrical section (501) and the conical section (503); the diameter of the second cylindrical section (502) is smaller than the diameter of the first cylindrical section (501); and the lower end of the force adjustment spring (6) is sleeved on the second cylindrical section (502).

4. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 1, characterized in that: The tip portion (5) on the top fixed stop iron (2) comprises a third cylindrical section (504) and a truncated cone section (506) which are coaxially connected in sequence from top to bottom, and the diameter of the third cylindrical section (504) is smaller than the diameter of the top fixed stop iron (2).

5. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 4, characterized in that: A fourth cylindrical section (505) is coaxially connected between the third cylindrical section (504) and the truncated cone section (506); the diameter of the fourth cylindrical section (505) is smaller than the diameter of the third cylindrical section (504); and the upper end of the force adjustment spring (6) is sleeved on the fourth cylindrical section (505).

6. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 4, characterized in that: An annular groove is formed in the side wall of the third cylindrical section (504) in an annular direction, and a sealing ring (8) is sleeved on the annular groove. The sealing ring (8) is used to seal the gap between the outer side of the third cylindrical section (504) and the inner side of the annular hollow stop iron (7).

7. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 1, characterized in that: The top fixed stop iron (2) and the annular hollow stop iron (7) are threadedly connected.

8. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 1, characterized in that: Both ends of the force adjustment spring (6) are respectively welded to the two tip portions (5).

9. A linear flow control valve based on a main-auxiliary bipolar magnetic circuit according to claim 1, characterized in that: The upper end of the annular hollow stop iron (7) protrudes from the valve body (1), the outer side of the protruding portion of the upper end of the annular hollow stop iron (7) is provided with an external thread, the upper end of the annular hollow stop iron (7) is screwed with a valve cover (9), and a gasket (10) is installed between the valve cover (9) and the annular hollow stop iron (7).

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