Valve element for throttling valve, machining method of valve element and throttling valve

Abstract

The invention discloses a valve element for a throttling valve, a machining method of the valve element and the throttling valve, and relates to the field of valve designing and manufacturing, the valve element comprises a body, and the body sequentially comprises a connecting part, a plugging part used for making contact with a valve seat for sealing and an anti-erosion part used for improving the anti-erosion capacity in the direction from the first end to the second end; the radius of the anti-erosion part tends to be gradually reduced in the direction from the first end to the second end, the surface of the anti-erosion part is provided with a multi-scale structure, and the multi-scale structure comprises a plurality of annular groove parts distributed in the axis direction of the body and a plurality of concave parts located on the surfaces of the groove parts. And the sizes of the groove part and the concave part are in a micro-size range. The valve element structure has the advantages of being low in cost and resistant to erosion.

Description

Technical Field

[0001] This invention relates to the field of valve design and manufacturing, and particularly to a valve core for a throttle valve, a processing method thereof, and a throttle valve. Background Technology

[0002] Throttling valves are core actuators in fluid transport and control systems. They adjust the relative position between the valve core and seat to change the flow area, thereby creating controllable local resistance and ultimately achieving precise control of fluid pressure and flow parameters. During operation, the valve core, as the key component directly in contact with the fluid and responsible for throttling, directly determines the overall performance and service life of the throttling valve due to its structural integrity and operational stability. In actual industrial applications, the fluids transported by throttling valves are often not pure; under many conditions, they contain solid particles of varying sizes. When a throttling gap forms between the valve core and seat, the fluid in this area experiences high-speed flow due to the sudden reduction in flow area. The solid particles in the medium, moving with the high-speed fluid, continuously impact, cut, and grind the valve core surface. This erosion gradually damages the valve core's surface structure, leading to decreased dimensional accuracy, sealing failure, and ultimately, throttling valve malfunction. This not only increases equipment maintenance costs but can also disrupt the continuity of the entire production process due to sudden failures, and even pose safety hazards. Therefore, improving the erosion resistance of the throttle valve core is a key technological breakthrough to solve problems such as short service life and poor operational reliability of throttle valves.

[0003] To address the issue of valve core erosion, the industry has conducted relevant technical research and proposed various solutions. The most representative approach is to use high-hardness materials for valve core manufacturing or surface strengthening. Regarding overall material application, a common technical solution is to use high-hardness carbide alloys to integrally mold the valve core, leveraging the excellent wear resistance and erosion resistance of carbide alloys to resist damage from solid particles. For example, Chinese patent application CN105179714A discloses a method for producing an erosion-resistant and corrosion-resistant high-pressure throttle valve and a combined valve core. This technical solution explicitly uses hard alloy materials to manufacture core components such as the throttle sleeve, throttle core, and valve seat, which are in direct contact with high-speed flowing gas media. The high hardness of the hard alloy helps resist erosion from high-speed airflow, thereby improving the erosion resistance and corrosion resistance of the components. However, the above-mentioned technical solution of using integral carbide alloy to manufacture valve cores has inherent defects that are difficult to avoid: First, the mechanical properties of carbide alloy materials themselves determine that their toughness is extremely low, while the operation of equipment in industrial production is often accompanied by a certain degree of vibration. The integral carbide alloy valve core is prone to stress concentration under vibration conditions, which can lead to fracture failure and affect the operational stability of the throttle valve. Second, the procurement and processing costs of high-hardness carbide alloys are both high, and using this material to manufacture valve cores as a whole will lead to a significant increase in the overall cost of the valve.

[0004] To balance erosion resistance and manufacturing cost, some researchers have proposed a surface strengthening scheme involving carbide alloy spraying onto the surface of ordinary alloy valve cores. This scheme prepares a high-hardness carbide coating on a low-cost ordinary alloy substrate, achieving erosion resistance through the coating while controlling overall cost by utilizing the ordinary alloy substrate. However, the core weakness of this surface spraying technology lies in the insufficient bonding between the coating and the substrate. Due to the significant difference in material properties between the ordinary alloy substrate and the carbide coating, the metallurgical bond between them is weak. Under the combined effects of high-speed fluid impact and long-term vibration, the coating is easily peeled off from the substrate surface. Once the coating peels off, the exposed ordinary alloy substrate has extremely poor erosion resistance and will be rapidly eroded and damaged by solid particles in the medium within a short time. This leads to a sharp decline in valve core performance, with a service life even shorter than that of an untreated ordinary valve core, failing to fundamentally solve the problem of valve core erosion failure.

[0005] In summary, existing technical solutions for erosion resistance of throttle valve cores all have obvious defects. They are either costly and have poor resistance to vibration and fracture, or they have problems such as easy peeling of the coating and short service life. None of them can meet the actual needs of industrial production for throttle valves that are "low-cost, highly reliable, and long-life". Summary of the Invention

[0006] In order to overcome the above-mentioned defects of the prior art, the technical problem to be solved by the embodiments of the present invention is to provide a valve core for a throttle valve and a processing method thereof, and a throttle valve, which can provide a valve core structure that has the advantages of low cost and erosion resistance.

[0007] The specific technical solution of this invention is as follows:

[0008] A valve core for a throttle valve, the valve core comprising:

[0009] The body comprises, from a first end to a second end, a connecting portion, a sealing portion for sealing in contact with a valve seat, and an anti-erosion portion for improving erosion resistance. The radius of the anti-erosion portion gradually decreases from the first end to the second end. The surface of the anti-erosion portion has a multi-scale structure, which includes multiple annular grooves distributed along the axial direction of the body and multiple recesses located on the surface of the grooves. The dimensions of the grooves and recesses are in the micro-scale range, except for the width range of the grooves.

[0010] Preferably, the cross-section of the groove is arc-shaped, the width of the cross-section of the groove is between 2mm and 4mm, the depth of the cross-section of the groove is between 0.1mm and 0.2mm, and the interval between the centers of two adjacent grooves is between 2mm and 4mm.

[0011] Preferably, the cross-section of the groove is arc-shaped, with the radius of the arc between 1mm and 3mm, and the width of the arc-shaped groove cross-section between 1mm and 2mm.

[0012] Preferably, the annular edges of the cross sections of two adjacent grooves are connected so that the surface of the erosion-resistant portion forms a continuous arc.

[0013] Preferably, the depth of the recess is between 20um and 50um, the angle between the inner wall and the bottom wall of the recess is between 120 degrees and 150 degrees, and the diameter of the recess is between 0.5mm and 0.7mm.

[0014] Preferably, the body further includes a top end portion located on one side of the second end of the erosion-resistant portion, the top end portion being partially spherical.

[0015] Preferably, the valve core is made of 30CrMo alloy steel or 12Cr18Ni9 alloy steel.

[0016] Preferably, the groove is formed by a ball-bearing roller.

[0017] Preferably, the recess is formed by laser impact.

[0018] A throttle valve, the throttle valve comprising:

[0019] A housing having an inlet and an outlet; a valve seat disposed within the housing having flow passages communicating with the inlet and the outlet respectively; and a valve core as described above, the valve core being movable to abut or separate the sealing portion from the valve seat.

[0020] A method for machining a valve core for a throttle valve as described above, the method comprising the following steps:

[0021] The connecting part, the sealing part and the tapered surface are machined from the bar stock by turning.

[0022] The tapered surface is rolled using a ball-type rolling cutter to form multiple annular grooves distributed along the axial direction of the body.

[0023] A laser is used to perform laser impact on the conical surface to form multiple recesses on the surface of the groove.

[0024] The technical solution of the present invention has the following significant beneficial effects:

[0025] In this application, when fluid passes over the valve core, firstly, the radius of the anti-erosion portion gradually decreases from the first end to the second end, which reduces the impact intensity of the fluid on the surface of the anti-erosion portion, thereby mitigating the degree of erosion wear on the valve core. Secondly, the grooves on the anti-erosion portion and the recesses on the surface of the grooves reduce the fluid flow velocity, thereby reducing the velocity at which solid particles in the fluid impact the valve core surface, further reducing the degree of erosion wear on the valve core. Moreover, the grooves and the micro-sized recesses cause turbulence in the surrounding fluid, changing the trajectory of solid particles in the fluid, preventing some solid particles from contacting the valve core surface, reducing the number of times solid particles impact the valve core, and thus improving the valve core's erosion resistance. Finally, the surface of the anti-erosion portion has a multi-scale structure. Even after the micro-sized recesses are eroded and fail, the relatively larger grooves can still ensure that they turbulent the fluid, thus extending the valve core's service life.

[0026] Specific embodiments of the invention are disclosed in detail below with reference to the description and accompanying drawings, indicating how the principles of the invention can be employed. It should be understood that the embodiments of the invention are not therefore limited in scope. Features described and / or shown for one embodiment may be used in the same or similar manner in one or more other embodiments, combined with features in other embodiments, or substituted for features in other embodiments. Attached Figure Description

[0027] The accompanying drawings described herein are for illustrative purposes only and are not intended to limit the scope of the invention in any way. Furthermore, the shapes and proportions of the components in the drawings are merely illustrative to aid in understanding the invention and do not specifically limit the shapes and proportions of the components. Those skilled in the art, guided by the teachings of this invention, can select various possible shapes and proportions to implement the invention according to specific circumstances.

[0028] Figure 1 This is a half-sectional view of the valve core used in the throttle valve in an embodiment of the present invention;

[0029] Figure 2 This is a schematic diagram of the anti-erosion part in an embodiment of the present invention;

[0030] Figure 3 This is a partial schematic diagram of the erosion-resistant part in an embodiment of the present invention;

[0031] Figure 4 This is a schematic diagram of the throttle valve in an embodiment of the present invention.

[0032] The reference numerals in the above figures are as follows:

[0033] 1. Body; 11. Connecting part; 12. Sealing part; 13. Erosion resistant part; 131. Multi-scale structure; 1311. Groove part; 1312. Recessed part; 14. Top part; 100. Shell; 1001. Inlet; 1002. Outlet; 200. Valve seat; 2001. Flow passage; 300. Valve core. Detailed Implementation

[0034] The details of the present invention can be more clearly understood by referring to the accompanying drawings and the description of specific embodiments. However, the specific embodiments of the present invention described herein are for illustrative purposes only and should not be construed as limiting the invention in any way. Under the teachings of this invention, those skilled in the art can conceive of any possible modifications based on the invention, all of which should be considered within the scope of the invention. It should be noted that when an element is referred to as being "set on" another element, it can be directly on the other element or there may be an intervening element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or there may be an intervening element. The terms "mounted," "connected," and "connected" should be interpreted broadly, for example, they can refer to mechanical or electrical connections, or internal communication between two elements, and can be direct or indirect connections through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms according to the specific circumstances. The terms "vertical," "horizontal," "upper," "lower," "left," "right," and similar expressions used herein are for illustrative purposes only and do not represent the only embodiments.

[0035] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the specification of this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The term "and / or" as used herein includes any and all combinations of one or more of the associated listed items.

[0036] In order to provide a valve core structure that combines low cost and erosion resistance, this application proposes a valve core for a throttle valve. Figure 1 This is a half-sectional view of the valve core used in the throttle valve according to an embodiment of the present invention. Figure 2 This is a schematic diagram of the anti-erosion part in an embodiment of the present invention. Figure 3 This is a partial schematic diagram of the erosion-resistant part in an embodiment of the present invention, such as... Figures 1 to 3 As shown, the valve core 300 may include: a body 1, which includes, from a first end to a second end, a connecting portion 11, a sealing portion 12 for sealing in contact with the valve seat 200, and an anti-erosion portion 13 for improving erosion resistance. The radius of the anti-erosion portion 13 gradually decreases from the first end to the second end. The surface of the anti-erosion portion 13 has a multi-scale structure 131. The multi-scale structure 131 includes a plurality of annular groove portions 1311 distributed along the axial direction of the body 1 and a plurality of recessed portions 1312 located on the surface of the groove portions 1311. The dimensions of the groove portions 1311 and the recessed portions 1312 are in the micro-scale range, except for the width range of the groove portions.

[0037] In this application, when fluid passes over the surface of the valve core 300, firstly, the radius of the anti-erosion portion 13 gradually decreases from the first end to the second end, which reduces the impact intensity of the fluid on the surface of the anti-erosion portion 13, thereby reducing the degree of erosion wear of the valve core 300; secondly, the groove portion 1311 on the anti-erosion portion 13 and the recess portion 1312 located on the surface of the groove portion 1311 can reduce the fluid flow velocity, and the velocity of solid particles in the fluid impacting the surface of the valve core 300 will decrease accordingly, reducing the degree of erosion wear on the valve core 300; moreover, the groove portion 1311 and the recess portion 1312 located in the micro-size range will cause turbulence in the surrounding fluid, change the movement trajectory of solid particles in the fluid, so that some solid particles cannot contact the surface of the valve core 300, reduce the number of times solid particles impact the valve core 300, and thus improve the erosion resistance of the valve core 300. Finally, the surface of the erosion-resistant part 13 has a multi-scale structure 131. Even after the recessed part 1312 in the micro-size range is eroded and fails, the relatively larger groove part 1311 can still ensure that it generates turbulence on the fluid, so as to extend the service life of the valve core 300.

[0038] like Figure 1 As shown, the body 1, from the first end to the second end, sequentially includes a connecting portion 11, a sealing portion 12 for sealing against the valve seat 200, and an anti-erosion portion 13 for improving erosion resistance. The connecting portion 11 is used to connect with a component that drives the valve core 300 to move. When the valve core 300 moves, the sealing portion 12 contacts the valve seat 200, thereby sealing the flow passage 2001 on the valve seat 200. The shape of the sealing portion 12 can match the valve seat 200, and it is generally a smooth surface, thereby achieving good sealing performance. The anti-erosion portion 13 can face the flow direction of the fluid in the throttle valve. When the valve core 300 is open, the fluid continuously impacts the anti-erosion portion 13. The radial cross-section of the anti-erosion portion 13 can be circular. The radius of the anti-erosion portion 13 gradually decreases from the first end to the second end. Here, the gradually decreasing trend specifically means that the radius of the anti-erosion part 13 does not decrease continuously from the first end to the second end; the radius of the anti-erosion part 13 may increase slightly in local intervals, as long as the overall trend is decreasing. Since the fluid generally flows from the second end to the first end, the above structure can reduce the impact intensity of the fluid on the surface of the anti-erosion part 13, thereby reducing the degree of erosion wear of the valve core 300.

[0039] Alternatively, the body 1 may also include a tip portion 14 located on one side of the second end of the anti-erosion portion 13, the tip portion 14 being partially spherical, such as hemispherical. The partially spherical shape can reduce the impact intensity of the fluid on the surface of the tip portion 14, thereby reducing the degree of erosion wear of the tip portion 14 of the valve core 300.

[0040] like Figure 2 and Figure 3 As shown, the surface of the erosion-resistant portion 13 can have a multi-scale structure 131. The multi-scale structure 131 includes multiple annular grooves 1311 distributed along the axial direction of the body 1 and multiple recesses 1312 located on the surface of the grooves 1311. The size of the recesses 1312 is in the micro-scale range. Specifically, the micro-scale range refers to the size range between 1 μm and 1 mm. The micro-scale recesses 1312 are easier to set on the relatively larger grooves 1311, and multiple recesses 1312 can be set in both the circumferential direction and the axial direction of the body 1. This allows recesses 1312 to be set at different positions of the grooves 1311, thereby reducing the fluid flow velocity and the velocity at which solid particles in the fluid impact the surface of the valve core 300, creating a turbulent effect on the fluid. This type of recess 1312 does not have a pressure-reducing or throttling effect, but it has a more superior erosion resistance.

[0041] Multiple annular grooves 1311 are provided on the erosion-resistant section 13 to turbulentize the flow, disrupt the near-wall flow field, increase the degree of fluid turbulence, reduce the fluid velocity, and change the fluid direction, thereby reducing the velocity of solid particles impacting the valve core 300, changing the particle trajectory, and reducing the probability of particle erosion.

[0042] Correspondingly, such as Figure 3 As shown, the width A of the cross-section of the groove portion 1311 can be between 2mm and 4mm. The spacing between the centers of two adjacent groove portions 1311 is between 2mm and 4mm. The depth H of the cross-section of the groove portion 1311 is between 0.1mm and 0.2mm.

[0043] Furthermore, the annular edges of the cross-sections of two adjacent groove portions 1311 are connected to form a continuous arc on the surface of the erosion-resistant portion 13. That is, the edges of the cross-section of the entire erosion-resistant portion 13 can generally be wavy with ups and downs.

[0044] In one alternative implementation, such as Figure 3 As shown, the recess 1312 has a circular pit structure with a flat bottom and sloping inner walls. Multiple recesses 1312 are distributed on the surface of the groove 1311 to form a microstructure array. The depth of the recess 1312 can be between 20 μm and 50 μm. The angle between the inner wall and the bottom wall of the recess 1312 is between 120 degrees and 150 degrees, and the diameter of the recess 1312 is between 0.5 mm and 0.7 mm. The spacing between the centers of adjacent recesses 1312 can be between 0.5 mm and 0.7 mm, only needing to be slightly larger than the diameter of the recess 1312.

[0045] In an optional embodiment, to increase the hardness of the valve core 300 and improve its erosion resistance, the valve core 300 can be made of alloy steel. Preferably, the valve core 300 is made of 30CrMo alloy steel or 12Cr18Ni9 alloy steel. 30CrMo alloy steel possesses both high strength and high toughness, and its excellent wear resistance allows it to withstand the high-pressure impact and frequent opening and closing loads during valve core 300 operation without easily deforming or breaking. Furthermore, 30CrMo alloy steel has lower raw material costs and relatively simple smelting and processing techniques, resulting in a cost advantage. 12Cr18Ni9 alloy steel has a moderately high level of erosion resistance, meeting the requirements of most conventional operating conditions. For example, the austenitic microstructure in 12Cr18Ni9 alloy steel imparts good toughness, buffering the stress caused by media impact and reducing brittle fracture or surface spalling; a dense chromium oxide passivation film easily forms on the surface, resisting wear from minor erosive media and maintaining surface integrity. 30CrMo alloy steel has outstanding corrosion resistance and can resist the erosion of corrosive media such as acids, alkalis, and salt solutions, preventing the valve core from rusting and causing sealing failure. In addition, 12Cr18Ni9 alloy steel has good machinability and can be precisely machined into multi-scale structures.

[0046] In order to further reduce the erosion and wear of the valve core 300 by the fluid, such as Figure 3 As shown, the cross-section of the groove portion 1311 is arc-shaped, and the radius R of the arc can be between 1mm and 3mm. The width of the cross-section of the arc-shaped groove portion 1311 is between 1mm and 2mm. The arc shape can be located at the bottom of the groove portion 1311.

[0047] In an alternative embodiment, the groove 1311 can be formed by a ball-bearing roller. The recess 1312 can be formed by laser impact. By using roller forming and laser impact, the metal grains on the surface of the erosion-resistant portion 13 can be refined, and residual compressive stress can be introduced to form a hardened layer on the surface of the erosion-resistant portion 13 of the valve core 300, which resists erosion and wear; at the same time, the core retains the toughness of the material, can withstand impact loads, and is not easily broken, achieving the effect of being hard on the outside and tough on the inside.

[0048] This application also proposes a throttle valve. Figure 4 This is a schematic diagram of the throttle valve in an embodiment of the present invention, as shown below. Figure 4 As shown, the throttle valve may include: a housing 100 having an inlet 1001 and an outlet 1002; a valve seat 200 disposed within the housing 100, the valve seat 200 having flow passages 2001 communicating with the inlet 1001 and the outlet 1002 respectively; and a valve core 300, as described above, which is movable to cause the sealing portion 12 to abut against or separate from the valve seat 200. The degree to which the throttle valve opens can be controlled according to the degree of vertical movement of the valve core 300.

[0049] This application also proposes a method for processing the valve core 300 for the throttle valve described above, the processing method including the following steps:

[0050] The connecting part 11, the sealing part 12 and the conical surface are machined from the bar stock by turning.

[0051] In this step, the heat-treated bar stock can be machined by turning to form a connecting part 11, a sealing part 12, and a conical surface, sequentially from the first end to the second end. Furthermore, the top part 14 located on one side of the second end of the conical surface can be machined into a partially spherical shape, such as a hemisphere.

[0052] A ball-type rolling cutter is used to roll the tapered surface to form multiple annular grooves 1311 distributed along the axial direction of the body 1.

[0053] In this step, a ball-bearing roller can be used to roll the conical surface once, thereby refining the metal grains in all areas of the conical surface, introducing residual compressive stress, and forming a hardened layer on the surface to resist erosion and wear. Then, the rolled conical surface is rolled again at a certain interval to form multiple annular grooves 1311 distributed along the axial direction of the body 1.

[0054] During the rolling process, the material surface undergoes work hardening due to plastic deformation. This plastic deformation leads to shear slip between crystals, lattice distortion, and causes grain elongation, breakage, and fibrosis, thereby increasing the surface hardness and strength. Simultaneously, residual compressive stress is formed on the material surface during rolling. This compressive stress helps improve the wear resistance and fatigue resistance of the workpiece. The presence of residual compressive stress makes the material surface denser, reduces defects, and thus improves the overall performance of the material.

[0055] In a preferred embodiment, a CNC lathe is used to control the rolling process. The spindle drives the valve core 300 to rotate. The radius of the ball in the ball rolling cutter is no greater than 1 mm. The cutter pressing amount is 0.2 mm. The spindle speed is no less than 3000 r / min. Lubrication is performed using lubricating oil.

[0056] A laser is used to perform laser impact on the conical surface to form multiple recesses 1312 on the surface of the groove portion 1311.

[0057] In this step, as is feasible, a layer of black tape can be covered on the conical surface as an absorption layer, water flow can be used as a constraint layer, and then a laser can be used to laser-impact the conical surface to form multiple spaced recesses 1312 on the surface of the groove 1311.

[0058] The absorbent layer tape can be 3M black tape. Before applying the absorbent layer tape, the valve core 300 should be ultrasonically cleaned with anhydrous ethanol.

[0059] Furthermore, the laser shock peening process can employ a nanosecond laser with a wavelength of approximately 1064 nm, a pulse width of approximately 10 ns, a spot diameter equal to the diameter of the recess 1312, and a pulse energy of not less than 5 J. During processing, the distance between the centers of the laser spot is not less than the diameter of the recess 1312. Due to the uneven distribution of laser energy, with low energy around the perimeter of the spot, the inner wall of the recess 1312 is inclined.

[0060] Laser shock peening utilizes ultra-high pressure shock waves induced by a laser beam to cause intense plastic deformation of a material surface in a very short time. Because shock wave propagation is a decaying process, plastic deformation ceases at a certain depth within the metal, thus inducing residual compressive stress across the entire deformation depth. Laser shock peening results in dislocation strengthening, twinning strengthening, and grain refinement strengthening on the surface, thereby increasing the surface strength and hardness of the material.

[0061] The surface hardened layer thickness of parts processed by roll forming can reach over 200 micrometers, while the hardened layer thickness of laser shock annealing is 250 micrometers. The internal material of the workpiece is not affected by roll forming and laser shock annealing, so the material properties remain unchanged and the original toughness is retained. Therefore, the surface hardness can be increased by using roll forming and laser shock annealing processes, achieving the effect of hard exterior and tough interior, and enhancing the resistance to erosion.

[0062] The valve core 300 for the throttle valve in this application can be fabricated into a multi-scale structure 131 using turning, rolling, or laser impact methods. The entire manufacturing process is simple and inexpensive. The multi-scale structure 131 increases the turbulence of the fluid, slows down the velocity of solid particles, and alters their trajectory. In this application, a larger-scale groove 1311 structure is combined with a smaller-scale recess 1312 structure to form a multi-scale micro / nano structure. After the fluid is turbulent by the larger-scale groove 1311 structure, it is further turbulent by the smaller-scale recess 1312 structure, further enhancing the turbulence. Furthermore, even after the smaller-scale recess 1312 structure is eroded and worn away, the larger-scale groove 1311 structure can still provide turbulence, thus extending the service life of the valve core 300. Moreover, the smaller-scale recess 1312 structure is pit-shaped, and even after erosion, it remains largely pit-shaped, still providing a small amount of turbulence to the fluid.

[0063] All articles and references disclosed herein, including patent applications and publications, are incorporated herein by reference for various purposes. The term “substantially constitutes…” used to describe a combination should include the identified element, component, part, or step, as well as other elements, components, parts, or steps that do not substantially affect the essential novelty of the combination. The use of the terms “comprising” or “including” to describe combinations of elements, components, parts, or steps herein also contemplates embodiments substantially constituted by such elements, components, parts, or steps. The use of the term “may” herein is intended to indicate that any described attribute “may” include is optional. Multiple elements, components, parts, or steps can be provided by a single integrated element, component, part, or step. Alternatively, a single integrated element, component, part, or step can be divided into multiple separate elements, components, parts, or steps. The disclosure of “a” or “an” used to describe an element, component, part, or step does not imply exclusion of other elements, components, parts, or steps.

[0064] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. The above embodiments are only for illustrating the technical concept and features of the present invention, and are intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. They should not be construed as limiting the scope of protection of the present invention. All equivalent changes or modifications made according to the spirit and essence of the present invention should be covered within the scope of protection of the present invention.

Claims

1. A valve core for a throttle valve, characterized in that, The valve core includes: The body comprises, from a first end to a second end, a connecting portion, a sealing portion for sealing in contact with a valve seat, and an anti-erosion portion for improving erosion resistance. The radius of the anti-erosion portion gradually decreases from the first end to the second end. The surface of the anti-erosion portion has a multi-scale structure, which includes multiple annular grooves distributed along the axial direction of the body and multiple recesses located on the surface of the grooves. The dimensions of the grooves and recesses are in the micro-scale range, except for the width range of the grooves.

2. The valve core for a throttle valve according to claim 1, characterized in that, The cross-section of the groove is arc-shaped, the width of the cross-section of the groove is between 2mm and 4mm, the depth of the cross-section of the groove is between 0.1mm and 0.2mm, and the interval between the centers of two adjacent grooves is between 2mm and 4mm.

3. The valve core for a throttle valve according to claim 2, characterized in that, The cross-section of the groove is arc-shaped, with a radius between 1mm and 3mm, and the width of the arc-shaped groove cross-section is between 1mm and 2mm.

4. The valve core for a throttle valve according to claim 2, characterized in that, The annular edges of the cross sections of two adjacent grooves are connected to form a continuous arc on the surface of the erosion-resistant portion.

5. The valve core for a throttle valve according to claim 1, characterized in that, The depth of the recess is between 20um and 50um, the angle between the inner wall and the bottom wall of the recess is between 120 degrees and 150 degrees, and the diameter of the recess is between 0.5mm and 0.7mm.

6. The valve core for a throttle valve according to claim 1, characterized in that, The body also includes a top end portion located on one side of the second end of the erosion-resistant portion, the top end portion being partially spherical.

7. The valve core for a throttle valve according to claim 1, characterized in that, The valve core is made of 30CrMo alloy steel or 12Cr18Ni9 alloy steel.

8. The valve core for a throttle valve according to claim 1, characterized in that, The groove is formed by a ball-bearing roller.

9. The valve core for a throttle valve according to claim 1, characterized in that, The recessed area was formed by laser impact.

10. A throttle valve, characterized in that, The throttle valve includes: A housing having an inlet and an outlet; a valve seat disposed within the housing having flow passages communicating with the inlet and the outlet respectively; and a valve core as claimed in any one of claims 1 to 9, the valve core being movable to abut or separate the sealing portion from the valve seat.

11. A method for processing a valve core for a throttle valve as described in claim 1, characterized in that, The processing method includes the following steps: The connecting part, the sealing part and the tapered surface are machined from the bar stock by turning. The tapered surface is rolled using a ball-type rolling cutter to form multiple annular grooves distributed along the axial direction of the body. A laser is used to perform laser impact on the conical surface to form multiple recesses on the surface of the groove.

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