Miniature high speed on-off valve

Abstract

This invention relates to the field of digital hydraulic technology, and in particular to a miniature high-speed switching valve. The switching valve includes: a drive assembly comprising a housing structure, a coil installed within the housing structure for generating a magnetic field, and an armature structure movably embedded in the central hole of the housing structure; a valve assembly comprising a valve sleeve, a valve core structure, and a valve stem, wherein the valve core structure has two selectively openable passages, the valve core structure and the valve stem are embedded in the valve sleeve and abut against each other along the axial direction of the valve sleeve, and the valve stem reciprocates within the valve sleeve as the passages switch; wherein the valve sleeve is fixed to the lower end of the central hole, the armature structure includes a return spring, an armature, and a limiting spring arranged sequentially from top to bottom, the stiffness of the return spring being greater than the stiffness of the limiting spring, the return spring abutting against the housing structure, the armature structure abutting against the valve stem, and the limiting spring sleeved on the outside of the valve stem.

Description

Technical Field

[0001] This invention relates to the field of digital hydraulic technology, and in particular to a miniature high-speed switching valve. Background Technology

[0002] With the development of digitalization and intelligentization, hydraulic components are also facing the challenge of digital upgrading. Currently, high-speed switching valves are widely used in hydraulic control circuits due to their advantages such as high opening and closing frequency and fast response speed. Furthermore, the drive structure of high-speed switching valves mainly adopts two forms: solenoid electromagnet + cylindrical helical spring, and disc electromagnet + wave spring. In addition, high-speed switching valves are typically controlled by PWM signals. A PWM signal is a periodic binary waveform that contains only two states: high level and low level. Each PWM cycle consists of an "on" time and a "off" time.

[0003] Therefore, PWM signals have discrete output characteristics, which leads to the following defects in high-speed switching valves controlled by PWM signals: First, strong impacts will occur between moving parts inside the valve during the opening and closing transition, resulting in short valve life and poor reliability; Second, existing miniature high-speed switching valves have complex structures, high requirements for machining accuracy, complex assembly processes, and high manufacturing costs. Summary of the Invention

[0004] This invention aims to at least solve one of the technical problems existing in related technologies. To this end, this invention proposes a miniature high-speed switching valve to optimize the valve structure, reduce the momentum of moving parts within the valve, avoid impact wear damage caused by high-frequency opening and closing, and improve service life.

[0005] The present invention provides a miniature high-speed switching valve, the switching valve comprising: a drive assembly, a housing structure provided for forming a closed-loop magnetic flux path, a coil installed in the housing structure for generating a magnetic field, and an armature structure movably embedded in the central hole of the housing structure;

[0006] A valve assembly includes a valve sleeve, a valve core structure, and a valve stem. The valve core structure has two selectively openable passages. The valve core structure and the valve stem are embedded in the valve sleeve and abut against each other along the axial direction of the valve sleeve. The valve stem reciprocates within the valve sleeve as the passages are switched.

[0007] The valve sleeve is fixed to the lower end of the central hole. The armature structure includes a return spring, an armature, and a limiting spring arranged sequentially from top to bottom. The stiffness of the return spring is greater than that of the limiting spring. The return spring abuts against the housing structure. The armature structure abuts against the valve stem. The limiting spring is sleeved on the outside of the valve stem.

[0008] According to the present invention, a miniature high-speed switching valve is provided in which the armature is provided with a variable diameter channel extending from its upper end face to its lower end face along its central axis.

[0009] The variable diameter channel has an annular shoulder protruding from its surface in the middle. The lower end of the return spring is embedded in the variable diameter channel and abuts against the annular shoulder. The upper end of the limiting spring is embedded in the variable diameter channel and abuts against the annular shoulder.

[0010] According to a miniature high-speed switching valve provided by the present invention, the armature structure further includes a push rod slidably embedded in the variable diameter channel, wherein the push rod is configured as a column with a large upper cross-section and a small lower cross-section;

[0011] The upper end of the push rod abuts against the top of the annular shoulder, and the lower end of the push rod protrudes below the annular shoulder and abuts against the valve stem.

[0012] According to a miniature high-speed switching valve provided by the present invention, the diameter of the variable diameter channel located above the annular shoulder is smaller than the diameter of the variable diameter channel located below the annular shoulder;

[0013] The upper end of the limiting spring is embedded in the annular gap formed by the variable diameter channel and the push rod.

[0014] According to a miniature high-speed switching valve provided by the present invention, the housing structure includes an outer shell, a magnetic isolation ring, a pole shoe, and a magnetic yoke, wherein the outer shell is sleeved on the outside of the magnetic isolation ring and is arranged to coincide with the central axis of the magnetic isolation ring;

[0015] The pole shoe is configured as a flange structure with a columnar protrusion at the center. The edge of the pole shoe is connected to the upper edge of the outer shell, and the protrusion is connected to the upper edge of the magnetic isolation ring. The magnetic yoke is configured as annular, with its outer wall connected to the lower edge of the outer shell and its inner wall connected to the lower edge of the magnetic isolation ring, thereby forming an annular cavity between the outer shell and the magnetic isolation ring.

[0016] The coil is wound inside the annular cavity.

[0017] According to a miniature high-speed switching valve provided by the present invention, the pole shoe is provided with a through hole for connecting the lead wire;

[0018] The number of turns of the coil gradually decreases along the axial direction of the housing structure from the yoke to the pole shoe. The outer surface of the coil is tapered. The coil and the housing have a gap covering the through hole at the end near the pole shoe.

[0019] According to a miniature high-speed switching valve provided by the present invention, the lower end of the magnetic shielding ring is provided with a main connecting part, the wall thickness of the main connecting part is half the wall thickness of the magnetic shielding ring and extends axially from the outer edge of the magnetic shielding ring;

[0020] The top surface of the magnetic yoke has a secondary connecting portion arranged along its inner edge. The wall thickness of the secondary connecting portion is the same as that of the main connecting portion. The main connecting portion and the secondary connecting portion are sleeved together to form an overlapping structure that is staggered along the axial direction.

[0021] According to a miniature high-speed switching valve provided by the present invention, the bottom surface of the protrusion of the pole shoe has the secondary connecting portion arranged along its outer edge to form a basin; the upper end of the magnetic shielding ring is provided with the main connecting portion for sleeve fixing the protrusion.

[0022] According to the present invention, a miniature high-speed switching valve is provided, wherein the valve sleeve is provided with a valve cavity channel extending from its upper end face to its lower end face along its central axis, the valve stem is slidably disposed at the upper end of the valve cavity channel, and the valve core structure is fixed at the lower end of the valve cavity channel.

[0023] The valve cavity channel is formed at the opening on the lower end face of the valve sleeve, which is a liquid inlet. The valve sleeve is also provided with a liquid outlet and a liquid return hole that extend from its outer side wall to the valve cavity channel.

[0024] According to the present invention, a miniature high-speed switching valve is provided, wherein the valve core structure includes a valve seat and a steel ball, the valve seat is provided with a valve channel for guiding liquid, and the valve channel extends through both ends of the valve seat along the axial direction of the valve seat.

[0025] The two valve seats are symmetrically arranged with their end faces touching. The steel ball is movably embedded in the valve channel and moves back and forth between the two valve seats to switch between the position where the inlet hole connects to the outlet hole and the position where the outlet hole connects to the return hole.

[0026] The above-described one or more technical solutions of this invention have at least one of the following technical effects:

[0027] By setting an elastic element at each end of the armature, the momentum of the armature can be reduced during the high-frequency opening and closing process of the miniature high-speed switching valve. This effectively buffers the impact of the high-speed moving armature on the housing structure and valve assembly, thereby effectively avoiding wear and damage caused by the impact and greatly improving the service life of the miniature switching valve.

[0028] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted by the present invention, and the advantages brought about by the technical features of these technical solutions as described above, other technical features of the present invention and the advantages brought about by these technical features will be further explained in conjunction with the accompanying drawings, or will be learned through the practice of the present invention. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 This is a schematic diagram of a miniature high-speed switching valve provided in an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of another miniature high-speed switching valve provided in an embodiment of the present invention.

[0032] Figure 3 for Figure 2 Enlarged schematic diagram of partial view A in the middle.

[0033] Figure label:

[0034] 1. Drive assembly; 100. Housing structure; 110. Outer shell; 120. Magnetic isolation ring; 121. Main connection part; 130. Pole shoe; 131. Protrusion; 132. Through hole; 140. Magnetic yoke; 141. Secondary connection part; 150. Center hole; 160. Annular cavity;

[0035] 200, armature structure; 210, return spring; 220, armature; 221, variable diameter channel; 222, annular shoulder; 230, push rod; 240, limit spring; 250, washer; 300, coil;

[0036] 2. Valve assembly; 400. Valve sleeve; 410. Valve cavity channel; 420. Liquid inlet; 421. Filter screen; 430. Liquid outlet; 440. Liquid return channel; 500. Valve core structure; 510. Valve seat; 511. Valve channel; 520. Steel ball; 600. Valve stem. Detailed Implementation

[0037] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0038] In the description of the embodiments of the present invention, it should be noted that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the embodiments of the present invention. In addition, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of the embodiments of the present invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "connected" and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention based on the specific circumstances.

[0040] In embodiments of the present invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply indicates that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is at a lower horizontal level than the second feature.

[0041] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0042] In existing technologies, high-speed switching valves are typically controlled using PWM signals. A PWM signal is a periodic binary waveform that contains two states: high level and low level. Each PWM cycle consists of an "on" time and a "off" time.

[0043] Therefore, PWM signals have discrete output characteristics, which leads to the following defects in high-speed switching valves controlled by PWM signals: First, strong impacts will occur between moving parts inside the valve during the opening and closing transition, resulting in short valve life and poor reliability; Second, existing miniature high-speed switching valves have complex structures, high requirements for machining accuracy, complex assembly processes, and high manufacturing costs.

[0044] To eliminate the above-mentioned defects, an embodiment of the present invention introduces a miniature high-speed switching valve.

[0045] like Figure 1 and Figure 2 As shown, the miniature high-speed switching valve mainly consists of two parts: a drive assembly 1 and a valve assembly 2. The drive assembly 1 includes a housing structure 100, a coil 300, and an armature structure 200. The coil 300 is installed inside the housing structure 100 and is used to generate a magnetic field. The housing structure 100 forms a closed-loop magnetic flux path, helping to concentrate and guide the magnetic lines of force generated by the coil 300, ensuring that the magnetic lines of force flow as designed, thereby optimizing the magnetic field structure inside the drive assembly 1. The armature structure 200 is movably embedded in the central hole 150 of the housing structure 100 and can move axially along the central hole 150.

[0046] Valve assembly 2 includes a valve sleeve 400, a valve core structure 500, and a valve stem 600. The valve core structure 500 has two selectively openable passages. The valve core structure 500 and the valve stem 600 are embedded within the valve sleeve 400. Furthermore, the valve stem 600 and the valve core structure 500 abut against each other along the axial direction of the valve sleeve 400, and the valve stem 600 reciprocates within the valve sleeve 400 as the passages switch.

[0047] Specifically, the armature structure 200 includes a return spring 210, an armature 220, and a limiting spring 240 arranged sequentially from top to bottom. The stiffness of the return spring 210 is greater than that of the limiting spring 240. The return spring 210 abuts against the housing structure 100. The armature structure 200 abuts against the valve stem 600. The limiting spring 240 is sleeved on the outside of the valve stem 600.

[0048] Furthermore, the valve sleeve 400 is fixed to the lower end of the central hole 150. When the valve stem 600 moves, it protrudes upward from the top surface of the valve sleeve 400.

[0049] Specifically, the lower end of the armature structure 200 abuts against the top end of the valve stem 600. When current is applied to the coil 300, the coil 300 generates a magnetic field, and the magnetic field lines extend along the housing structure 100 to form a magnet that can attract the armature structure 200.

[0050] When the drive assembly 1 is energized, it drives the armature 220 to move upward against the elastic force of the return spring 210 until the armature 220 abuts against the bottom surface of the center hole 150. When the drive assembly 1 is de-energized, the armature 220 moves downward under the elastic force of the return spring 210 until the armature 220 moves to its initial position. At this time, the valve stem 600 moves downward under the push of the armature structure 200, triggering the valve core structure 500 to switch the passage.

[0051] Furthermore, the valve sleeve 400 is provided with a valve cavity channel 410. The valve cavity channel 410 extends from the upper end face of the valve sleeve 400 to the lower end face of the valve sleeve 400 along the central axis direction. The valve core structure 500 is fixed to the lower end of the valve cavity channel 410. The valve stem 600 is slidably disposed at the upper end of the valve cavity channel 410. Moreover, the lower end of the valve stem 600 abuts against the valve core structure 500, so that the switching of the passage within the valve core structure 500 is related to the position of the valve stem 600. In this way, the valve stem 600, under the push of the armature 220, can control the switching of the passage of the valve assembly 2.

[0052] like Figure 1 and Figure 2 As shown, the valve cavity channel 410 has an inlet port 420 formed on the lower end face of the valve sleeve 400. A filter screen is embedded at the lower end of the valve cavity channel 410 to prevent impurities from entering the hydraulic circuit.

[0053] The valve sleeve 400 is also provided with an outlet hole 430 and a return hole 440. The outlet hole 430 and the return hole 440 extend from the outer wall of the valve sleeve 400 to the surface of the valve cavity channel 410. Specifically, the valve stem 600 is configured as a columnar structure, thicker at the upper end and thinner at the lower end. Furthermore, the diameter of the upper end of the valve stem 600 is the same as the diameter of the valve cavity channel 410. The upper end of the valve stem 600 is in close contact with and slides relative to the valve cavity channel 410. The diameter of the lower end of the valve stem 600 is smaller than the diameter of the valve cavity channel 410, thus forming an annular cavity between the lower end of the valve stem 600 and the valve cavity channel 410. The opening of the return hole 440 is located in this cavity.

[0054] Furthermore, the valve core structure 500 is provided with two valve seats 510 and a steel ball 520. The valve seat 510 is provided with a valve passage 511 for guiding liquid, and the valve passage 511 extends through both ends of the valve seat 510 along the axial direction. The lower end of the valve stem 600 passes through the valve passage 511 of the upper valve seat 510 and abuts against the steel ball 520.

[0055] Specifically, the valve cavity channel 410 is divided into three sections from top to bottom. The first section has the smallest diameter, and the valve stem 600 passes through the first section. The orifice of the return port 440 is located on the side wall of the first section. Due to the change in diameter, a step is formed at the adjoining point of the second section and the first section. The valve seat 510 is embedded in the second section. The third section has the largest diameter and is equipped with a filter screen.

[0056] Two valve seats 510 are symmetrically arranged and their end faces are in contact. A steel ball 520 is movably embedded in the valve channel 511 and reciprocates between the two valve seats 510 to switch between the position where the inlet hole 420 connects to the outlet hole 430 and the position where the outlet hole 430 connects to the return hole 440.

[0057] The input of high-pressure liquid through the inlet port 420 can push the steel ball 520 upward, thereby causing the valve stem 600 to protrude upward from the top surface of the valve sleeve 400.

[0058] In this embodiment, the drive assembly 1 provides an elastic element at each end of the armature 220, which reduces the momentum of the armature 220 during the high-frequency opening and closing process of the micro high-speed switching valve. This effectively buffers the impact of the high-speed moving armature 220 on the housing structure 100 and the valve assembly 2, thereby effectively avoiding wear and damage caused by the impact and greatly improving the service life of the micro switching valve.

[0059] Based on the above embodiments, another embodiment of the present invention introduces a miniature high-speed switching valve.

[0060] The armature 220 is provided with a variable diameter channel 221. The variable diameter channel 221 extends from the upper end face of the armature 220 to the lower end face of the armature 220 along the central axis of the armature 220.

[0061] The variable diameter channel 221 has an annular shoulder 222 protruding from its surface in the middle. The lower end of the return spring 210 is embedded in the variable diameter channel 221 and abuts against the annular shoulder 222. The upper end of the limiting spring 240 is embedded in the variable diameter channel 221 and abuts against the annular shoulder 222.

[0062] The stiffness of the return spring 210 is greater than that of the limit spring 240, which ensures the working air gap size of the armature 220 and reduces the large momentum generated by the armature 220 during the attraction process. The return spring 210 is embedded inside the armature 220. When the armature 220 is attracted, the return spring 210 is compressed by the annular shoulder 222. When the armature 220 is released, the return spring 210 pushes the armature 220, which in turn pushes the valve stem 600, thereby changing the opening and closing state of the passage inside the valve core structure 500.

[0063] Based on the above embodiments, another embodiment of the present invention introduces a miniature high-speed switching valve that can avoid direct contact between the armature 220 and the valve stem 600, thereby reducing the impact force.

[0064] The armature structure 200 is also provided with a push rod 230 for driving the valve stem 600. The push rod 230 is slidably embedded in the variable diameter channel 221. The push rod 230 is configured as a column with a large upper cross section and a small lower cross section.

[0065] The upper end of the push rod 230 abuts against the top of the annular shoulder 222, and the lower end of the push rod 230 protrudes below the annular shoulder 222. Thus, the top surface of the push rod 230 abuts against the return spring 210, and the bottom surface of the push rod 230 abuts against the valve stem 600. The return spring 210 and the push rod 230 are located inside the armature 220. When the armature 220 is engaged, the annular shoulder 222 drives the push rod 230 to move upward and compress the return spring 210. When the armature 220 is released, the return spring 210 drives the push rod 230 and the armature 220 to move downward together. Furthermore, the push rod 230 drives the valve stem 600 to move downward.

[0066] Preferably, the diameter of the variable diameter channel 221 located above the annular shoulder 222 is smaller than the diameter of the variable diameter channel 221 located below the annular shoulder 222. The upper end of the limiting spring 240 is embedded in the annular gap formed by the variable diameter channel 221 and the push rod 230.

[0067] Based on the above embodiments, another embodiment of the present invention introduces a miniature high-speed switching valve.

[0068] The housing structure 100 includes an outer shell 110, a magnetic shielding ring 120, a pole shoe 130, and a magnetic yoke 140. The outer shell 110 is sleeved on the outside of the magnetic shielding ring 120 and is arranged to coincide with the central axis of the magnetic shielding ring 120.

[0069] The pole shoe 130 is a flange structure with a central columnar protrusion 131. The edge of the pole shoe 130 is connected to the upper edge of the outer shell 110, and the protrusion 131 of the pole shoe 130 is connected to the upper edge of the magnetic isolation ring 120. The magnetic yoke 140 is annular, with its outer wall connected to the lower edge of the outer shell 110 and its inner wall connected to the lower edge of the magnetic isolation ring 120, thereby forming an annular cavity 160 between the outer shell 110 and the magnetic isolation ring 120.

[0070] The coil 300 is wound inside the annular cavity 160.

[0071] Specifically, the pole shoe 130, the magnetic shielding ring 120, and the magnetic yoke 140 are welded together using laser welding. After welding, insulating varnish is sprayed onto the surfaces of the pole shoe 130, the magnetic shielding ring 120, and the magnetic yoke 140. Then, a coil 300 is wound on the magnetic shielding ring 120.

[0072] When winding the coil 300, it is wound into a tapered structure with a gradually decreasing diameter from the yoke 140 to the outer surface of the pole shoe 130. Then, the outer shell 110 is fitted with the pole shoe 130 and the yoke 140. The washer, push rod 230, return spring 210 and armature 220 are then installed into the center hole 150 of the housing structure 100.

[0073] Next, the valve stem 600, valve seat 510, and steel ball 520 are sequentially pressed into the valve sleeve 400 to complete the assembly of valve assembly 2. Preferably, the filter screen is installed at the liquid inlet of the valve sleeve 400.

[0074] Finally, the assembled valve assembly 2 is pressed into the central hole 150 of the housing structure 100. Furthermore, a stamping fixture is used to stamp and seal the connection between the valve assembly 2 and the housing structure 100. Specifically, the magnetic yoke 140 has a through hole extending along its central axis through its upper and lower end faces. A groove is provided on the bottom surface of the magnetic yoke 140. The bottom surface of the groove communicates with the through hole. The diameter of the groove is larger than the diameter of the through hole, forming a stepped surface, and the valve sleeve 400 is embedded in the groove. Figure 3 As shown, the valve sleeve 400 and the magnetic yoke 140 are fixed together using a stamping and closing process. The connection between the valve sleeve 400 and the magnetic yoke 140 via stamping and closing ensures the reliability of the connection.

[0075] Preferably, the top surface of the pole shoe 130 is provided with a hexagonal hole, and the outer surface of the magnetic yoke 140 is provided with a threaded structure to facilitate optional connection and installation.

[0076] Furthermore, the pole shoe 130 is provided with a through hole 132 for threading out the lead wire. The number of turns of the coil 300 gradually decreases along the axial direction of the housing structure 100 from the magnetic yoke 140 to the pole shoe 130, so that the outer surface of the coil 300 is tapered.

[0077] The coil 300 and the housing 110 have a gap covering the through hole 132 at the end near the pole shoe 130, which provides sufficient space for the lead wires of the coil 300. Compared with the traditional cylindrical coil 300 structure, the space utilization rate is higher.

[0078] Based on the above embodiments, another embodiment of the present invention introduces a miniature high-speed switching valve.

[0079] A main connecting portion 121 is provided at the lower end of the magnetic shielding ring 120. The wall thickness of the main connecting portion 121 is half the wall thickness of the magnetic shielding ring 120. Furthermore, the main connecting portion 121 extends axially from the outer edge of the magnetic shielding ring 120.

[0080] Correspondingly, the top surface of the magnetic yoke 140 has a secondary connecting portion 141 disposed along its inner edge. The wall thickness of the secondary connecting portion 141 is the same as the wall thickness of the main connecting portion 121. The main connecting portion 121 and the secondary connecting portion 141 are fitted together to form an axially staggered overlapping structure.

[0081] Furthermore, a secondary connecting portion 141 is also provided on the bottom surface of the protrusion 131 of the pole shoe 130. The secondary connecting portion 141 is provided along the outer edge of the protrusion 131 and extends downward to form a basin. A main connecting portion 121 is provided at the upper end of the magnetic shielding ring 120 for fitting and fixing the protrusion 131.

[0082] Based on the above embodiments, another embodiment of the present invention introduces a miniature high-speed switching valve.

[0083] The valve sleeve 400 is provided with a valve cavity channel 410 extending from its upper end face to its lower end face along its central axis. The valve stem 600 is slidably disposed at the upper end of the valve cavity channel 410. The valve core structure 500 is fixed to the lower end of the valve cavity channel 410.

[0084] The valve cavity channel 410 has an opening at the lower end face of the valve sleeve 400, which is a liquid inlet 420. The valve sleeve 400 is also provided with a liquid outlet 430 and a liquid return 440 that extend from its outer side wall to the valve cavity channel 410.

[0085] Furthermore, the valve core structure 500 includes a valve seat 510 and a steel ball 520. The valve seat 510 is provided with a valve passage 511 for guiding liquid, and the valve passage 511 extends through both ends of the valve seat 510 along the axial direction of the valve seat 510.

[0086] Two valve seats 510 are symmetrically arranged with their end faces touching. A steel ball 520 is movably embedded in the valve channel 511 and moves back and forth between the two valve seats 510 to switch between the position where the inlet hole 420 connects to the outlet hole 430 and the position where the outlet hole 430 connects to the return hole 440.

[0087] In this embodiment, the valve core structure 500 is composed of two identical valve seats 510 respectively press-fitted into the valve cavity channel 410 and a steel ball 520 movably embedded in the valve seat 510, which greatly simplifies the structure of the valve sleeve 400 and reduces the difficulty of the processing technology.

[0088] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0089] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the protection scope of the present invention.

Claims

1. A miniature high-speed switching valve, characterized in that, include: The drive assembly (1) is provided with a housing structure (100) for forming a closed-loop magnetic flux path, a coil (300) installed in the housing structure (100) for generating a magnetic field, and an armature structure (200) movably embedded in the central hole (150) of the housing structure (100). The valve assembly (2) is provided with a valve sleeve (400), a valve core structure (500) and a valve stem (600). The valve core structure (500) has two selectively openable passages. The valve core structure (500) and the valve stem (600) are embedded in the valve sleeve (400) and abut against each other along the axial direction of the valve sleeve (400). The valve stem (600) moves back and forth in the valve sleeve (400) as the passages are switched. The valve sleeve (400) is fixed to the lower end of the central hole (150). The armature structure (200) includes a return spring (210), an armature (220), and a limiting spring (240) arranged sequentially from top to bottom. The stiffness of the return spring (210) is greater than that of the limiting spring (240). The return spring (210) abuts against the housing structure (100). The armature structure (200) abuts against the valve stem (600). The limiting spring (240) is sleeved on the outside of the valve stem (600). The armature (220) is provided with a variable diameter channel (221) extending from its upper end face to its lower end face along its central axis. The variable diameter channel (221) has an annular shoulder (222) protruding from its surface in the middle. The lower end of the return spring (210) is embedded in the variable diameter channel (221) and abuts against the annular shoulder (222). The upper end of the limiting spring (240) is embedded in the variable diameter channel (221) and abuts against the annular shoulder (222). The armature structure (200) also includes a push rod (230) slidably embedded in the variable diameter channel (221), the push rod (230) being configured as a column with a large upper cross section and a small lower cross section; The upper end of the push rod (230) abuts against the top of the annular shoulder (222), and the lower end of the push rod (230) protrudes below the annular shoulder (222) and abuts against the valve stem (600); The upper end of the limiting spring (240) is embedded in the annular gap formed by the variable diameter channel (221) and the push rod (230).

2. The miniature high-speed switching valve according to claim 1, characterized in that, The diameter of the variable diameter channel (221) located above the annular shoulder (222) is smaller than the diameter of the variable diameter channel (221) located below the annular shoulder (222).

3. The miniature high-speed switching valve according to claim 1 or 2, characterized in that, The housing structure (100) includes an outer shell (110), a magnetic shielding ring (120), a pole shoe (130), and a magnetic yoke (140). The outer shell (110) is sleeved on the outside of the magnetic shielding ring (120) and is arranged to coincide with the central axis of the magnetic shielding ring (120). The pole shoe (130) is a flange structure with a central columnar protrusion (131). The edge of the pole shoe (130) is connected to the upper edge of the outer shell (110), and the protrusion (131) is connected to the upper edge of the magnetic isolation ring (120). The magnetic yoke (140) is annular, and its outer wall is connected to the lower edge of the outer shell (110), and its inner wall is connected to the lower edge of the magnetic isolation ring (120), thereby forming an annular cavity (160) between the outer shell (110) and the magnetic isolation ring (120). The coil (300) is wound inside the annular cavity (160).

4. The miniature high-speed switching valve according to claim 3, characterized in that, The pole shoe (130) is provided with a through hole (132) for threading out the lead wire. The number of turns of the coil (300) gradually decreases along the axial direction of the housing structure (100) from the magnetic yoke (140) to the pole shoe (130). The outer surface of the coil (300) is tapered. The coil (300) and the housing (110) have a gap covering the through hole (132) at one end near the pole shoe (130).

5. The miniature high-speed switching valve according to claim 4, characterized in that, The lower end of the magnetic shielding ring (120) is provided with a main connecting part (121), the wall thickness of the main connecting part (121) is half the wall thickness of the magnetic shielding ring (120) and extends axially from the outer edge of the magnetic shielding ring (120); The top surface of the magnetic yoke (140) has a secondary connecting portion (141) arranged along its inner edge. The wall thickness of the secondary connecting portion (141) is the same as that of the main connecting portion (121). The main connecting portion (121) and the secondary connecting portion (141) are sleeved to form an overlapping structure that is staggered along the axial direction.

6. The miniature high-speed switching valve according to claim 5, characterized in that, The bottom surface of the protrusion (131) of the pole shoe (130) has the secondary connecting part (141) arranged along its outer edge to form a basin mouth; the upper end of the magnetic shielding ring (120) is provided with the main connecting part (121) for sleeve fixing the protrusion (131).

7. The miniature high-speed switching valve according to claim 1 or 2, characterized in that, The valve sleeve (400) is provided with a valve cavity channel (410) extending from its upper end face to its lower end face along its central axis. The valve stem (600) is slidably disposed at the upper end of the valve cavity channel (410), and the valve core structure (500) is fixed at the lower end of the valve cavity channel (410). The valve cavity channel (410) is formed at the opening on the lower end face of the valve sleeve (400) as an inlet hole (420). The valve sleeve (400) is also provided with an outlet hole (430) and a return hole (440) that extend from its outer side wall to the valve cavity channel (410).

8. The miniature high-speed switching valve according to claim 7, characterized in that, The valve core structure (500) includes a valve seat (510) and a steel ball (520). The valve seat (510) is provided with a valve passage (511) for guiding liquid. The valve passage (511) extends through both ends of the valve seat (510) along the axial direction of the valve seat (510). The two valve seats (510) are abutted together and symmetrically arranged. The steel ball (520) is movably embedded in the valve channel (511) and moves back and forth between the two valve seats (510) to switch between the position where the inlet hole (420) connects to the outlet hole (430) and the position where the outlet hole (430) connects to the return hole (440).

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