Miniature high-speed switch valve

Abstract

The invention relates to the technical field of digital hydraulic pressure, in particular to a miniature high-speed switch valve. The switch valve comprises a driving assembly provided with a shell structure, a coil installed in the shell structure and used for generating a magnetic field, and an armature structure movably embedded in a center hole of the shell structure; the valve assembly is provided with a valve sleeve, a valve element structure and a valve rod, the valve element structure is provided with two channels which are opened alternatively, the valve element structure and the valve rod are embedded in the valve sleeve and abut against each other in the axial direction of the valve sleeve, and the valve rod moves in the valve sleeve in a reciprocating mode along with switching of the channels. Wherein the valve sleeve is fixed to the lower end of the center hole, the armature structure comprises a reset spring, an armature and a limiting spring which are sequentially arranged from top to bottom, the rigidity of the reset spring is larger than that of the limiting spring, the reset spring is connected with the shell structure in an abutting mode, the armature structure is connected with the valve rod in an abutting mode, and the armature structure is connected with the valve rod in an abutting mode. The limiting spring is arranged on the outer side of the valve rod in a sleeving mode.

Description

Technical Field

[0001] The invention relates to the technical field of digital hydraulics, and in particular to a miniature high-speed switching valve. Background Art

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

[0003] Therefore, the PWM signal has a discrete output characteristic, which leads to the following defects of the high-speed switching valve controlled by the PWM signal: First, strong impact will be generated between the moving parts in the valve during the opening and closing conversion, resulting in a short life of the entire valve and poor reliability; second, the existing miniature high-speed switching valve has a complex structure, high requirements on processing accuracy, complex assembly process, and high production cost. Summary of the invention

[0004] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a micro high-speed switch valve to optimize the switch valve structure, reduce the momentum of the moving parts in the valve, avoid the impact wear and tear caused by high-frequency opening and closing, and increase the service life.

[0005] The present invention provides a miniature high-speed switch valve, which includes: a drive assembly, a housing structure 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 a central hole of the housing structure; A valve assembly is provided with a valve sleeve, a valve core structure and a valve stem, wherein the valve core structure is provided with two passages which are selectively opened, 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 in the valve sleeve accompanying the switching of the passages; Among them, the valve sleeve is fixed to the lower end of the center hole, the armature structure includes a return spring, an armature and a limit spring arranged in sequence from top to bottom, the stiffness of the return spring is greater than the stiffness of the limit spring, the return spring abuts against the shell structure, the armature structure abuts against the valve stem, and the limit spring sleeve is arranged on the outside of the valve stem.

[0006] According to a micro high-speed switch valve provided by the present invention, the armature is provided with a variable diameter channel extending from its upper end surface to its lower end surface along its central axis; The middle part of the variable diameter channel has an annular shoulder protruding from its surface, the lower end of the return spring is embedded in the variable diameter channel and abuts against the annular shoulder, and the upper end of the limit spring is embedded in the variable diameter channel and abuts against the annular shoulder.

[0007] According to a micro high-speed switch valve provided by the present invention, the armature structure further comprises a push rod slidably embedded in the variable diameter hole, and the push rod is configured as a column with a large upper end section and a small lower end section; The upper end of the push rod stops above the annular shoulder, and the lower end of the push rod protrudes below the annular shoulder and abuts against the valve stem.

[0008] According to a micro 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; The upper end of the limit spring is embedded in the annular interval formed by the variable diameter hole and the push rod.

[0009] According to a micro high-speed switch valve provided by the present invention, the housing structure comprises a shell, a magnetic isolation ring, a pole shoe and a magnetic yoke, the 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; 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 shell, the protrusion is connected to the upper edge of the magnetic isolation ring, the magnetic yoke is configured as a ring, and its outer wall is connected to the lower edge of the shell, and its inner wall is connected to the lower edge of the magnetic isolation ring, so as to form an annular cavity between the shell and the magnetic isolation ring; The coil is wound in the annular cavity.

[0010] According to a micro high-speed switch valve provided by the present invention, the pole shoe is provided with a through hole for passing a lead wire; The number of turns of the coil gradually decreases along the axial direction of the shell structure from the yoke to the pole shoe. The outer surface of the coil is a conical surface. The coil and the shell have a gap covering the via hole at one end close to the pole shoe.

[0011] According to a micro high-speed switch valve provided by the present invention, a main connecting portion is provided at the lower end of the magnetic isolation ring, the wall thickness of the main connecting portion is half of the wall thickness of the magnetic isolation ring and extends axially from the outer edge of the magnetic isolation ring; The top surface of the magnetic yoke has a secondary connection portion arranged along its inner edge, the wall thickness of the secondary connection portion is the same as that of the main connection portion, and the main connection portion and the secondary connection portion are sleeved to form an overlapping structure staggered along the axial direction.

[0012] According to a miniature high-speed switching valve provided by the present invention, the bottom surface of the convex part of the pole shoe has the secondary connecting part arranged along its outer edge to form a basin mouth; the main connecting part is arranged at the upper end of the magnetic isolation ring for sleeve-fitting and fixing the convex part.

[0013] According to a micro high-speed switching valve provided by the present invention, the valve sleeve is provided with a valve cavity channel extending from its upper end surface to its lower end surface along its central axis, the valve stem is slidably arranged 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. The opening of the valve cavity channel formed on the lower end surface of the valve sleeve is a liquid inlet hole, and the valve sleeve is also provided with a liquid outlet hole and a liquid return hole penetrating from its outer side wall to the valve cavity channel.

[0014] According to a micro high-speed switching valve provided by the present invention, 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 penetrates through both ends of the valve seat along the axial direction of the valve seat. The two valve seats are symmetrically arranged with their end faces touching each other, and the steel ball is movably embedded in the valve channel and reciprocates between the two valve seats to switch between the position where the liquid inlet hole is connected to the liquid outlet hole and the position where the liquid outlet hole is connected to the liquid return hole.

[0015] The above one or more technical solutions in the present invention have at least one of the following technical effects: By arranging an elastic part at each end of the armature, the movement momentum of the armature can be reduced during the high-frequency opening and closing process of the micro high-speed switching valve, effectively buffering the impact of the high-speed moving armature on the housing structure and the valve assembly, thereby effectively avoiding wear and damage caused by the impact, and greatly improving the service life of the micro switching valve.

[0016] In addition to the technical problems solved by the present invention, the technical features of the technical solutions constituted, and the advantages brought about by the technical features of these technical solutions 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 understood through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 A schematic structural diagram of a micro high-speed switching valve provided in an embodiment of the present invention.

[0019] Figure 2 A schematic structural diagram of another micro high-speed switching valve provided in an embodiment of the present invention.

[0020] Figure 3 for Figure 2 A is an enlarged schematic diagram of the partial view in FIG.

[0021] Reference numerals: 1. drive assembly; 100. housing structure; 110. housing; 120. magnetic isolation ring; 121. main connection part; 130. pole shoe; 131. convex part; 132. through hole; 140. yoke; 141. secondary connection part; 150. center hole; 160. annular cavity; 200, armature structure; 210, return spring; 220, armature; 221, variable diameter hole; 222, annular shoulder; 230, push rod; 240, limit spring; 250, gasket; 300, coil; 2. Valve assembly; 400. Valve sleeve; 410. Valve cavity channel; 420. Liquid inlet hole; 421. Filter screen; 430. Liquid outlet hole; 440. Liquid return hole; 500. Valve core structure; 510. Valve seat; 511. Valve channel; 520. Steel ball; 600. Valve stem. DETAILED DESCRIPTION

[0022] In order to make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be clearly described below in conjunction with the drawings of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0023] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and 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 devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0024] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0025] In the embodiments of the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0026] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0027] In the prior art, high-speed switch valves are usually controlled by PWM signals. PWM signals are periodic binary waveforms that contain two states: high level and low level. Each PWM cycle consists of an "on" time and an "off" time.

[0028] Therefore, the PWM signal has a discrete output characteristic, which leads to the following defects of the high-speed switching valve controlled by the PWM signal: First, strong impact will be generated between the moving parts in the valve during the opening and closing conversion, resulting in a short life of the entire valve and poor reliability; second, the existing miniature high-speed switching valve has a complex structure, high requirements on processing accuracy, complex assembly process, and high production cost.

[0029] In order to eliminate the above defects, a micro high-speed switching valve is introduced in an embodiment of the present invention.

[0030] like Figure 1 and Figure 2 As shown, the micro high-speed switch valve is mainly composed of two parts: a drive component 1 and a valve component 2. Among them, the drive component 1 is provided with a shell structure 100, a coil 300 and an armature structure 200. The coil 300 is installed in the shell structure 100 to generate a magnetic field. The shell structure 100 is used to form a closed-loop magnetic flux path to help concentrate and guide the magnetic lines of force generated by the coil 300, ensure that the magnetic lines of force flow as designed, and thus optimize the magnetic field structure inside the drive component 1. The armature structure 200 is movably embedded in the center hole 150 of the shell structure 100 and can move along the axial direction of the center hole 150.

[0031] 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 is provided with two passages that can be opened selectively. The valve core structure 500 and the valve stem 600 are embedded in the valve sleeve 400. In addition, the valve stem 600 and the valve core structure 500 are in contact with each other along the axial direction of the valve sleeve 400, and the valve stem 600 reciprocates in the valve sleeve 400 as the passages are switched.

[0032] In particular, the armature structure 200 includes a return spring 210, an armature 220 and a limit spring 240 which are sequentially arranged from top to bottom. The stiffness of the return spring 210 is greater than that of the limit spring 240. The return spring 210 abuts against the housing structure 100. The armature structure 200 abuts against the valve stem 600. The limit spring 240 is sleeved on the outside of the valve stem 600.

[0033] Furthermore, the valve sleeve 400 is fixed to the lower end of the central hole 150. The valve stem 600 protrudes upward from the top surface of the valve sleeve 400 when moving.

[0034] Specifically, the lower end of the armature structure 200 abuts against the top end of the valve stem 600. When current is passed through the coil 300, the coil 300 generates a magnetic field, and the magnetic lines of force of the magnetic field extend along the housing structure 100 to form a magnet that can attract the armature structure 200.

[0035] When the drive assembly 1 is powered, the armature 220 can be driven to move upward to overcome the elastic force of the return spring 210 until the armature 220 contacts the bottom surface of the center hole 150. When the drive assembly 1 is powered off, the armature 220 moves downward under the elastic force of the return spring 210 until the armature 220 moves to the initial position. At this time, the valve stem 600 moves downward under the push of the armature structure 200 to trigger the valve core structure 500 to switch the passage.

[0036] Further, the valve sleeve 400 is provided with a valve cavity channel 410. The valve cavity channel 410 passes through from the upper end surface of the valve sleeve 400 to the lower end surface of the valve sleeve 400 along the central axis direction of the valve sleeve 400. The valve core structure 500 is fixed to the lower end of the valve cavity channel 410. The valve stem 600 is slidably arranged at the upper end of the valve cavity channel 410. In addition, the lower end of the valve stem 600 abuts against the valve core structure 500, so that the switching of the passage in 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 valve assembly 2 to switch the passage.

[0037] like Figure 1 and Figure 2 As shown, the opening of the valve cavity channel 410 formed on the lower end surface of the valve sleeve 400 is the liquid inlet hole 420. A filter screen is embedded at the lower end of the valve cavity channel 410 to prevent impurities from entering the hydraulic circuit.

[0038] The valve sleeve 400 is also provided with a liquid outlet hole 430 and a liquid return hole 440. The liquid outlet hole 430 and the liquid return hole 440 penetrate from the outer side 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 with a thick upper end and a thin lower end. In addition, the upper end diameter 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 fits tightly with the valve cavity channel 410 and slides relatively. The lower end diameter of the valve stem 600 is smaller than the diameter of the valve cavity channel 410, so that an annular cavity is formed between the lower end of the valve stem 600 and the valve cavity channel 410. The orifice of the liquid return hole 440 is located at the cavity.

[0039] 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 channel 511 for guiding liquid, and the valve channel 511 penetrates both ends of the valve seat 510 along the axial direction of the valve seat 510. The lower end of the valve stem 600 penetrates into the valve channel 511 of the upper valve seat 510 and abuts against the steel ball 520.

[0040] 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 is connected to the first section. The orifice of the return hole 440 is located on the side wall of the first section. Due to the change in diameter, a step is formed at the adjacent part 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 embedded with a filter screen.

[0041] The two valve seats 510 are symmetrically arranged and contact each other with their end faces. The 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 liquid inlet 420 is connected to the liquid outlet 430 and the position where the liquid outlet 430 is connected to the liquid return hole 440.

[0042] The high-pressure liquid input into the liquid inlet hole 420 can push the steel ball 520 to move upward, thereby driving the valve stem 600 to protrude upward from the top surface of the valve sleeve 400 .

[0043] In this embodiment, the drive component 1 is equipped with an elastic member at each end of the armature 220, so that the movement momentum of the armature 220 can be reduced during the high-frequency opening and closing process of the micro high-speed switching valve, and the impact of the high-speed moving armature 220 on the shell structure 100 and the valve component 2 can be effectively buffered, thereby effectively avoiding wear and damage caused by the impact, and greatly improving the service life of the micro switching valve.

[0044] Based on the above embodiment, in another embodiment of the present invention, a micro high-speed switching valve is introduced.

[0045] The armature 220 is provided with a diameter-changing hole 221 . The diameter-changing hole 221 runs along the central axis of the armature 220 , from the upper end surface of the armature 220 to the lower end surface of the armature 220 .

[0046] The middle part of the variable diameter hole 221 has an annular shoulder 222 protruding from the surface thereof. The lower end of the return spring 210 is embedded in the variable diameter hole 221 and abuts against the annular shoulder 222. The upper end of the limit spring 240 is embedded in the variable diameter hole 221 and abuts against the annular shoulder 222.

[0047] The stiffness of the return spring 210 is greater than that of the limit spring 240, which can ensure the size of the working air gap of the armature 220 and reduce the large momentum generated by the armature 220 during the suction process. The return spring 210 is embedded in the armature 220. When the armature 220 is sucked, 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, and the armature 220 pushes the valve stem 600, thereby changing the opening and closing state of the passage in the valve core structure 500.

[0048] On the basis of the above-mentioned embodiment, in another embodiment of the present invention, a miniature high-speed switch valve is introduced which can prevent the armature 220 from directly contacting the valve stem 600 to reduce the impact force.

[0049] 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 hole 221. The push rod 230 is configured as a column with a large cross section at the upper end and a small cross section at the lower end.

[0050] The upper end of the push rod 230 stops above the annular shoulder 222, and the lower end of the push rod 230 protrudes below the annular shoulder 222. As a result, 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 attracted, the push rod 230 is driven to move upward through the annular shoulder 222 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. Then, the push rod 230 drives the valve stem 600 to move downward.

[0051] Preferably, the diameter of the variable diameter hole 221 above the annular shoulder 222 is smaller than the diameter of the variable diameter hole 221 below the annular shoulder 222. The upper end of the limit spring 240 is embedded in the annular interval formed by the variable diameter hole 221 and the push rod 230.

[0052] Based on the above embodiment, in another embodiment of the present invention, a micro high-speed switching valve is introduced.

[0053] The housing structure 100 includes a housing 110, a magnetic isolation ring 120, a pole shoe 130 and a magnetic yoke 140. The housing 110 is sleeved outside the magnetic isolation ring 120 and is arranged to coincide with the central axis of the magnetic isolation ring 120.

[0054] The pole shoe 130 is configured as a flange structure having a cylindrical protrusion 131 at the center. The edge of the pole shoe 130 is connected to the upper edge of the housing 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 configured as an annular shape and its outer wall is connected to the lower edge of the housing 110, and its inner wall is connected to the lower edge of the magnetic isolation ring 120, so that an annular cavity 160 is formed between the housing 110 and the magnetic isolation ring 120.

[0055] The coil 300 is wound in the annular cavity 160 .

[0056] Specifically, the pole shoe 130, the magnetic isolation ring 120, and the magnetic yoke 140 are welded together by laser welding. After welding, insulating paint is sprayed on the surfaces of the pole shoe 130, the magnetic isolation ring 120, and the magnetic yoke 140. Then, the coil 300 is wound on the magnetic isolation ring 120.

[0057] When the coil 300 is wound, 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 housing 110 is sleeved with the pole shoe 130 and the yoke 140. Then, the gasket, the push rod 230, the return spring 210 and the armature 220 are installed in the central hole 150 of the housing structure 100.

[0058] Afterwards, the valve stem 600, the valve seat 510, and the steel ball 520 are sequentially pressed into the valve sleeve 400 to complete the assembly of the valve assembly 2. Preferably, the filter screen is installed at the liquid inlet of the valve sleeve 400.

[0059] Finally, the assembled valve assembly 2 is pressed into the center hole 150 of the shell structure 100. In addition, the connection between the valve assembly 2 and the shell structure 100 is stamped and closed using a stamping tool. Specifically, the yoke 140 is provided with a through hole that passes through its upper and lower end surfaces along the center axis. A groove is provided on the bottom surface of the yoke 140. The bottom surface of the groove is connected to the through hole. The diameter of the groove is larger than the diameter of the through hole to form a step surface, and the valve sleeve 400 is embedded in the groove. Figure 3 As shown, the valve sleeve 400 and the yoke 140 are fixed by a stamping and closing process. The valve sleeve 400 and the yoke 140 are connected by a stamping and closing process, which ensures the reliability of the connection.

[0060] Preferably, a hexagonal hole is provided on the top surface of the pole shoe 130, and a threaded structure is provided on the outer surface of the yoke 140 to facilitate optional connection and installation.

[0061] Furthermore, the pole shoe 130 is provided with a through hole 132 for passing the lead wire. The number of turns of the coil 300 gradually decreases along the axial direction of the housing structure 100 from the yoke 140 to the pole shoe 130, so that the outer surface of the coil 300 is a conical surface.

[0062] The coil 300 and the housing 110 have a gap covering the via 132 at one end close to the pole shoe 130, leaving enough space for the lead wires of the coil 300. Compared with the traditional cylindrical coil 300 structure, the space utilization rate is higher.

[0063] Based on the above embodiment, in another embodiment of the present invention, a micro high-speed switching valve is introduced.

[0064] A main connection portion 121 is provided at the lower end of the magnetic isolation ring 120. The wall thickness of the main connection portion 121 is half of the wall thickness of the magnetic isolation ring 120. In addition, the main connection portion 121 extends from the outer edge of the magnetic isolation ring 120 along the axial direction.

[0065] Correspondingly, the top surface of the yoke 140 has a secondary connection portion 141 arranged along its inner edge. The wall thickness of the secondary connection portion 141 is the same as that of the main connection portion 121. The main connection portion 121 and the secondary connection portion 141 are sleeved to form an overlapping structure staggered along the axial direction.

[0066] Furthermore, a secondary connection part 141 is also provided on the bottom surface of the protrusion 131 of the pole shoe 130. The secondary connection part 141 is provided along the outer edge of the protrusion 131 and extends downward to form a basin mouth. A main connection part 121 is provided at the upper end of the magnetic isolation ring 120 for sleeve-fitting and fixing the protrusion 131.

[0067] Based on the above embodiment, in another embodiment of the present invention, a micro high-speed switching valve is introduced.

[0068] The valve sleeve 400 is provided with a valve cavity channel 410 extending from its upper end surface to its lower end surface 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 at the lower end of the valve cavity channel 410.

[0069] The opening of the valve cavity channel 410 formed on the lower end surface of the valve sleeve 400 is a liquid inlet hole 420 . The valve sleeve 400 is also provided with a liquid outlet hole 430 and a liquid return hole 440 which penetrate from its outer side wall to the valve cavity channel 410 .

[0070] 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 channel 511 for guiding liquid. The valve channel 511 penetrates through both ends of the valve seat 510 along the axial direction of the valve seat 510 .

[0071] The two valve seats 510 are symmetrically arranged with their end faces touching each other, and the 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 liquid inlet hole 420 connects to the liquid outlet hole 430 and the position where the liquid outlet hole 430 connects to the liquid return hole 440.

[0072] In this embodiment, the valve core structure 500 is composed of two identical valve seats 510 respectively pressed 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.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present invention.

[0074] 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 principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A micro high-speed switching valve, characterized in that: include: A 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 a central hole (150) of the housing structure (100); A valve assembly (2) is provided with a valve sleeve (400), a valve core structure (500) and a valve stem (600), wherein the valve core structure (500) is provided with two passages which are selectively opened, 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), and the valve stem (600) reciprocates in the valve sleeve (400) as the passages are switched; The valve sleeve (400) is fixed to the lower end of the center hole (150), the armature structure (200) comprises a return spring (210), an armature (220) and a limit spring (240) which are arranged in sequence from top to bottom, the stiffness of the return spring (210) is greater than the stiffness of the limit spring (240), the return spring (210) abuts against the shell structure (100), the armature structure (200) abuts against the valve stem (600), and the limit spring (240) is sleeved on the outside of the valve stem (600).

2. The micro high-speed switching valve according to claim 1, characterized in that: The armature (220) is provided with a diameter-changing hole (221) extending along its central axis from its upper end surface to its lower end surface; The middle portion of the variable diameter hole (221) has an annular shoulder (222) protruding from its surface, the lower end of the return spring (210) is embedded in the variable diameter hole (221) and abuts against the annular shoulder (222), and the upper end of the limit spring (240) is embedded in the variable diameter hole (221) and abuts against the annular shoulder (222).

3. The micro high-speed switching valve according to claim 2, characterized in that: The armature structure (200) further comprises a push rod (230) slidably embedded in the variable diameter hole (221); the push rod (230) is configured as a column having a large cross-section at the upper end and a small cross-section at the lower end; The upper end of the push rod (230) abuts against the annular shoulder (222), and the lower end of the push rod (230) protrudes from below the annular shoulder (222) and abuts against the valve stem (600).

4. The micro high-speed switching valve according to claim 3, characterized in that: The diameter of the variable diameter hole (221) located above the annular shoulder (222) is smaller than the diameter of the variable diameter hole (221) located below the annular shoulder (222); The upper end of the limit spring (240) is embedded in the annular space formed by the variable diameter hole (221) and the push rod (230).

5. The micro high-speed switching valve according to any one of claims 1 to 4, characterized in that: The housing structure (100) comprises a housing (110), a magnetic isolation ring (120), a pole shoe (130) and a magnetic yoke (140); the housing (110) is sleeved on the outside of the magnetic isolation ring (120) and is arranged to coincide with the central axis of the magnetic isolation ring (120); The pole shoe (130) is configured as a flange structure having a columnar protrusion (131) at the center; the edge of the pole shoe (130) is connected to the upper edge of the housing (110), and the protrusion (131) is connected to the upper edge of the magnetic isolation ring (120); the magnetic yoke (140) is configured as an annular shape, and its outer wall is connected to the lower edge of the housing (110), and its inner wall is connected to the lower edge of the magnetic isolation ring (120), so that an annular cavity (160) is formed between the housing (110) and the magnetic isolation ring (120); The coil (300) is wound in the annular cavity (160).

6. The micro high-speed switching valve according to claim 5, characterized in that: The pole shoe (130) is provided with a through hole (132) for passing a 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 a conical surface; and the coil (300) and the housing (110) have a gap covering the via hole (132) at one end close to the pole shoe (130).

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

8. The micro high-speed switching valve according to claim 7, characterized in that: The bottom surface of the convex portion (131) of the pole shoe (130) has the secondary connection portion (141) arranged along its outer edge to form a basin mouth; the main connection portion (121) is arranged at the upper end of the magnetic isolation ring (120) for sleeve-fitting and fixing the convex portion (131).

9. The micro high-speed switching valve according to any one of claims 1 to 4, characterized in that: The valve sleeve (400) is provided with a valve cavity channel (410) extending from its upper end surface to its lower end surface 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 opening of the valve cavity channel (410) formed on the lower end surface of the valve sleeve (400) is a liquid inlet hole (420), and the valve sleeve (400) is also provided with a liquid outlet hole (430) and a liquid return hole (440) penetrating from its outer side wall to the valve cavity channel (410).

10. The micro high-speed switching valve according to claim 9, characterized in that: The valve core structure (500) comprises a valve seat (510) and a steel ball (520); the valve seat (510) is provided with a valve channel (511) for guiding liquid; the valve channel (511) penetrates through two ends of the valve seat (510) along the axial direction of the valve seat (510); The two valve seats (510) are symmetrically arranged with their end faces touching each other, and the steel ball (520) is movably embedded in the valve channel (511) and reciprocates between the two valve seats (510) to switch between a position where the liquid inlet hole (420) is connected to the liquid outlet hole (430) and a position where the liquid outlet hole (430) is connected to the liquid return hole (440).

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