A rotary switching valve fitting and manufacturing method, and a rotary switching valve

Abstract

The application relates to a rotating switch valve accessory, a preparation method and a rotating switch valve. The rotating switch valve accessory is attached to a corresponding fitting in the rotating switch valve and can be relatively rotated with the fitting with a normal line of the attached surface as a rotating shaft to realize the on-off of the rotating switch valve. The accessory comprises an accessory body and a coating. The accessory body has a fitting surface; the coating is arranged on the fitting surface at least, and the coating comprises a first transition bonding layer close to the accessory body and a wear-resistant layer located on the side, away from the accessory body, of the first transition bonding layer; the hardness of the first transition bonding layer is greater than that of the accessory body, and the hardness of the first transition bonding layer is less than that of the wear-resistant layer. The rotating switch valve accessory can improve the wear resistance of the accessory, and based on the transition cooperation of the first transition bonding layer, the wear-resistant layer can be more firmly arranged on the fitting surface of the accessory through the first transition bonding layer, the stability of the wear-resistant layer is improved, and the service life of the accessory is improved.

Description

Technical Field

[0001] This application relates to the field of switching valve technology, and in particular to a component for a rotary switching valve and its preparation method, and a rotary switching valve. Background Technology

[0002] A rotary switching valve typically consists of a fixed stator and a rotating rotor. The stator and rotor are in close contact with each other, and the rotation of the rotor causes relative rotation between them, thus opening and closing the valve. Over time, the mating surfaces of the stator and rotor in a rotary switching valve will wear, easily leading to fluid leakage. Summary of the Invention

[0003] This application provides an accessory for a rotary switching valve, which fits into a corresponding mating part in the rotary switching valve and is capable of rotating relative to the mating part about a normal to the mating surface of the two parts as an axis of rotation, so as to realize the on / off switching of the rotary switching valve, comprising: The accessory body has mating surfaces; A coating is provided at least on the mating surface, the coating comprising a first transition bonding layer near the component body and a wear-resistant layer located on the side of the first transition bonding layer away from the component body; wherein, the hardness of the first transition bonding layer is greater than the hardness of the component body, and the hardness of the first transition bonding layer is less than the hardness of the wear-resistant layer.

[0004] In some embodiments, the coating includes a second transition bonding layer located between the first transition bonding layer and the wear-resistant layer; wherein the hardness of the second transition bonding layer is greater than the hardness of the first transition bonding layer, and the hardness of the second transition bonding layer is less than the hardness of the wear-resistant layer.

[0005] In some embodiments, the material of the accessory body is austenitic stainless steel, and the material of the first transition bonding layer is metal.

[0006] In some embodiments, the wear-resistant layer is made of diamond-like carbon; the thickness of the wear-resistant layer is 1µm to 10µm. The first transition bonding layer is made of a metal, including at least one of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten; the thickness of the first transition bonding layer is 1µm to 10µm. The material of the second transition bonding layer is at least one of tungsten and tungsten carbide; the thickness of the second transition bonding layer is 1µm to 10µm.

[0007] In some embodiments, the accessory body has a protrusion structure located in the middle on one side in the thickness direction, and the outermost surface of the protrusion structure is the mating surface.

[0008] In some embodiments, the accessory serves as a fastener fixed to the rotary switching valve; The accessory has multiple through holes that extend through the accessory in the thickness direction. One end of each through hole is located on the side surface of the accessory body facing away from the protruding structure, and the other end is located on the mating surface of the protruding structure. Some of the multiple through holes are inlet holes, and the other part are outlet holes that correspond to the inlet holes. When the accessory is rotatably engaged with the mating part, the rotary switching valve can be in an open or closed state; when the rotary switching valve is in the open state, the inlet is connected to the corresponding outlet; when the rotary switching valve is in the closed state, the inlet is disconnected from the corresponding outlet.

[0009] In some embodiments, the fitting is a rotating component rotatably disposed in a rotary switching valve, and at least the middle region of one side surface of the fitting in the thickness direction is the mating surface, and the fitting is provided with one or more spaced communicating grooves recessed from the mating surface; When the accessory rotates and engages with the mating component, the rotary switching valve can be in an open or closed state. The mating component has one or more sets of corresponding inlet and outlet holes. When the rotary switching valve is in the open state, each of the connecting grooves is opposite to a set of corresponding inlet and outlet holes in the mating component, so that the corresponding inlet and outlet holes are connected. When the rotary switching valve is in the closed state, each of the connecting grooves is offset from at least one of the corresponding set of inlet and outlet holes, so that the corresponding inlet and outlet holes are disconnected.

[0010] This application also provides a rotary switching valve, which includes a fixed part and a rotating part. The fixed part and the rotating part are fitted together and can rotate relative to each other about a normal to the mating surface of the two parts as a rotation axis, thereby realizing the opening and closing of the rotary switching valve. Wherein, the fixing member is the accessory as described above; and / or, the rotating member is the accessory as described above.

[0011] This application also provides a method for manufacturing a fitting for a rotary switching valve. The fitting can be fitted with a corresponding mating part in the rotary switching valve and can rotate relative to the mating part about a normal to their mating surfaces as an axis of rotation, thereby realizing the on / off switching of the rotary switching valve. The manufacturing method includes: A component body is provided, the component body having a mating surface; A coating is provided on the mating surface of the accessory body; the coating includes a first transition bonding layer close to the accessory body and a wear-resistant layer located on the side of the first transition bonding layer away from the accessory body; wherein, the hardness of the first transition bonding layer is greater than the hardness of the accessory body, and the hardness of the first transition bonding layer is less than the hardness of the wear-resistant layer.

[0012] In some embodiments, applying a coating to the mating surface of the accessory body includes: The first transition bonding layer is formed on the mating surface of the accessory body by vapor deposition. The wear-resistant layer is formed on the side of the first transition bonding layer away from the component body by means of vapor phase deposition.

[0013] In some embodiments, the coating includes a second transition bonding layer located between the first transition bonding layer and the wear-resistant layer; wherein the hardness of the second transition bonding layer is greater than the hardness of the first transition bonding layer, and the hardness of the second transition bonding layer is less than the hardness of the wear-resistant layer; the provisioning of the coating on the mating surface of the accessory body includes: The first transition bonding layer is formed on the mating surface of the accessory body by vapor deposition. The second transition bonding layer is formed on the mating surface of the accessory body by vapor deposition. The wear-resistant layer is formed on the side of the first transition bonding layer away from the component body by means of vapor phase deposition.

[0014] In some embodiments, the material of the accessory body is austenitic stainless steel, and the material of the first transition bonding layer is metal.

[0015] In some embodiments, the wear-resistant layer is made of diamond-like carbon; the thickness of the wear-resistant layer is 1µm to 10µm. The first transition bonding layer is made of a metal, including at least one of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten; the thickness of the first transition bonding layer is 1µm to 10µm. The material of the second transition bonding layer is at least one of tungsten and tungsten carbide; the thickness of the second transition bonding layer is 1µm to 10µm.

[0016] The rotary switching valve fittings and manufacturing method provided in this application embodiment, as well as the rotary switching valve, improve the wear resistance of the fitting by providing a coating on at least the mating surface of the fitting body. This coating includes a first transition bonding layer near the fitting body and a wear-resistant layer located on the side of the first transition bonding layer away from the fitting body. Furthermore, the hardness of the first transition bonding layer is greater than that of the fitting body, and the hardness of the first transition bonding layer is less than that of the wear-resistant layer. Simultaneously, based on the transition fit of the first transition bonding layer, the wear-resistant layer can be more firmly attached to the mating surface of the fitting through the first transition bonding layer, improving the stability of the wear-resistant layer and thus increasing the service life of the fitting.

[0017] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and are not intended to limit the invention. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments or related technologies of this application, the accompanying drawings used in the description of the embodiments or related technologies will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of a component for a rotary switching valve provided in one embodiment of this application; Figure 2 A partial cross-sectional schematic diagram of one embodiment of this application; Figure 3 This is a schematic diagram of the structure of another rotary switching valve accessory provided in an embodiment of this application; Figure 4 A cross-sectional view of a rotary switching valve provided in one embodiment of this application; Figure 5 for Figure 4 A side view of the rotary switching valve shown from one perspective; Figure 6 A flowchart illustrating a method for manufacturing a component for a rotary switching valve, as provided in an embodiment of this application; Figures 7 to 10 This is a series of process diagrams illustrating the preparation of a rotary switching valve accessory according to an embodiment of this application. Detailed Implementation

[0020] Exemplary embodiments will now be described in detail, examples of which are illustrated in the accompanying drawings. When the following description relates to the drawings, unless otherwise indicated, the same numbers in different drawings denote the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with this application. Rather, they are merely examples of apparatuses and methods consistent with some aspects of this application as detailed in the appended claims.

[0021] In related technologies, rotary switching valves typically add a coating with a hardness significantly greater than that of the stator or rotor surface to improve wear resistance. However, due to the significant difference in physical properties between the coating and the stator or rotor surface materials, the matching degree between the coating and the stator or rotor surface is low, resulting in high internal stress in the coating, poor adhesion between the coating and the stator or rotor surface, and severe coating peeling.

[0022] Therefore, this application provides a component for a rotary switching valve, a method for manufacturing the component, and a rotary switching valve. The component fits into a corresponding mating part of the rotary switching valve and is rotatably fitted with the mating part about a normal to their mating surfaces to achieve the on / off switching of the rotary switching valve. The component includes a component body and a coating. The component body has a mating surface; the coating is at least disposed on the mating surface, and the coating includes a first transition bonding layer near the component body and a wear-resistant layer located on the side of the first transition bonding layer away from the component body; wherein the hardness of the first transition bonding layer is greater than the hardness of the component body, and the hardness of the first transition bonding layer is less than the hardness of the wear-resistant layer. The aforementioned rotary switching valve fittings, by providing a coating on at least the mating surface of the fitting body, and configuring the coating to include a first transition bonding layer close to the fitting body and a wear-resistant layer located on the side of the first transition bonding layer away from the fitting body; and the hardness of the first transition bonding layer being greater than the hardness of the fitting body and less than the hardness of the wear-resistant layer, can effectively improve the wear resistance of the fittings. At the same time, based on the transition fit of the first transition bonding layer, the wear-resistant layer can be more firmly set on the mating surface of the fittings through the first transition bonding layer, improving the stability of the wear-resistant layer and thus helping to extend the service life of the fittings.

[0023] The following is in conjunction with the appendix Figures 1 to 5 This application provides a detailed description of the rotary switching valve accessories, manufacturing methods, and the rotary switching valve itself.

[0024] Please refer to Figure 1 and combine when necessary Figure 2 This application provides a component 1 for a rotary switching valve, which fits into a corresponding mating part in the rotary switching valve and can rotate relative to the mating part about a normal to the mating surface of the two as an axis of rotation, so as to realize the on / off switching of the rotary switching valve.

[0025] The rotary switching valve fitting 1 includes a fitting body 10 and a coating 20. The fitting body 10 has a mating surface 102.

[0026] The coating 20 is provided at least on the mating surface 102. The coating 20 includes a first transition bonding layer 21 near the accessory body 10 and a wear-resistant layer 23 located on the side of the first transition bonding layer 21 away from the accessory body 10; wherein, the hardness of the first transition bonding layer 21 is greater than the hardness of the accessory body 10, and the hardness of the first transition bonding layer 21 is less than the hardness of the wear-resistant layer 23.

[0027] When mating with the corresponding mating part in the rotary switching valve, specifically, the coating 20 surface on the mating surface 102 is mated with the corresponding mating part.

[0028] In some embodiments, the coating 20 further includes a second transition bonding layer 22 located between the first transition bonding layer 21 and the wear-resistant layer 23; wherein the hardness of the second transition bonding layer 22 is greater than the hardness of the first transition bonding layer 21, and the hardness of the second transition bonding layer 22 is less than the hardness of the wear-resistant layer 23.

[0029] In some embodiments, the wear-resistant layer 23 is made of diamond-like carbon (DLC).

[0030] In some embodiments, the thickness of the wear-resistant layer 23 is 1µm to 10µm.

[0031] In some embodiments, the accessory body 10 is made of austenitic stainless steel, and the first transition bonding layer 21 is made of metal.

[0032] The first transition bonding layer 21 utilizes the structural characteristics of a metallic material with large grains and small pores to strengthen the bonding force with the second transition bonding layer 22 and the wear-resistant layer 23, thereby improving the bonding force between the substrate and the wear-resistant layer 23.

[0033] In some embodiments, the material of the first transition bonding layer 21 is a metal, at least one of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten.

[0034] In some embodiments, the thickness of the first transition bonding layer 21 is 1µm to 10µm; In some embodiments, the material of the second transition bonding layer 22 is at least one of tungsten and tungsten carbide. In some embodiments, the thickness of the second transition bonding layer 22 is 1µm to 10µm.

[0035] Based on the above description, the wear-resistant layer 23 is a diamond-like carbon (DLC) layer. In the second transition bonding layer 22, tungsten is mainly embedded in the amorphous DLC coating (i.e., the wear-resistant layer 23) in the form of tungsten carbide (WC1-x, where x is a number less than 1 and greater than or equal to 0) nanocrystals, which alleviates the distortion of carbon atom sp3 hybridization in the wear-resistant layer 23 and reduces the internal stress of the wear-resistant layer 23. With an appropriate tungsten content, tungsten and carbon atoms in the wear-resistant layer 23 combine to form WC1-x, which not only plays a role in dispersion and reinforcement but also results in a higher proportion of sp3 bonds in the wear-resistant layer 23. Although the proportion of sp3 bonds in the wear-resistant layer 23 increases while the proportion of sp2 bonds decreases, increasing the overall friction coefficient of the coating, as the temperature rises during friction, some sp3 bonds in the wear-resistant layer 23 undergo graphitization and transform into carbon atom sp2 bonds, playing a role in lubrication and friction reduction. Therefore, the W element in the second transition bonding layer 22 improves the wear resistance of the coating. That is, the provision of the second transition bonding layer 22 increases the bonding force with the wear-resistant layer 23 while ensuring the lubricity and wear resistance of the wear-resistant layer 23.

[0036] The hardness of austenitic stainless steel is approximately 200 HV. The hardness of the first transition bonding layer can be 700–900 HV, the hardness of the second transition bonding layer can reach 2600 HV, and the hardness of the DLC layer is 2600–2800 HV. It is evident that the coating 20 achieves a gradient transition in hardness from the component body 10 to the first transition bonding layer 21, the second transition bonding layer 22, and the DLC layer. This gradient transition in hardness improves the support strength of the substrate and effectively hinders the propagation of cracks in the coating 20.

[0037] The bonding strength between the coating 20 and the accessory body 10 described above in this application can reach HF1 level (a relatively high level in the bonding strength assessment method).

[0038] It should be noted that in some other embodiments, only one transition bonding layer may be provided on the inner side of the wear-resistant layer. This transition bonding layer may be a material layer doped with at least one of metallic tungsten and tungsten carbide.

[0039] like Figure 1 As shown, the accessory body 10 has a protruding structure 12 located in the middle on one side in the thickness direction. The outermost surface of the protruding structure 12 is the mating surface 102.

[0040] In some embodiments, the rotary switching valve accessory 1 serves as a fastener fixed within the rotary switching valve.

[0041] The rotary switching valve fitting 1 has a plurality of through holes 101 extending through the fitting in the thickness direction. One end of each through hole 101 is located on the side surface of the fitting body 10 facing away from the protruding structure 12, and the other end is located on the mating surface 102 of the protruding structure 12. Some of the through holes 101 are inlet holes, and others are outlet holes corresponding to the inlet holes.

[0042] for example Figure 1 The rotary switching valve fitting 1 shown may include six through holes evenly distributed on the same circle. These six through holes can be divided into three pairs. Each pair of through holes can serve as both an inlet and an outlet. For example, one through hole 1011 and an adjacent through hole 1012 can each have one as an inlet and the other as an outlet.

[0043] When accessory 1 is rotatably engaged with mating parts, the rotary switching valve can be in an open or closed state; when the rotary switching valve is in the open state, the inlet is connected to the corresponding outlet; when the rotary switching valve is in the closed state, the inlet is disconnected from the corresponding outlet.

[0044] like Figure 3 As shown, and combined where necessary. Figure 2As shown, accessory 2 also has an accessory body and a coating. The surface of the accessory body of accessory 2, where the mating surface is located, can be entirely flat. At least in the area where the mating surface is located, this flat surface has a coating 20 similar to that of accessory 1. The material of the accessory body of accessory 2 is similar to that of the accessory body of accessory 1. For details, please refer to the above description. Unlike accessory 1, accessory 2 is a rotating component rotatably disposed in a rotary switching valve, and it mates with a fixed component similar to that of accessory 1.

[0045] The fitting 2 has at least a middle region on one side surface in the thickness direction as the mating surface 102, and the fitting 2 is provided with one or more spaced communicating grooves 201 recessed from the mating surface 102.

[0046] The mating surface 102 can be... Figure 3 The area corresponding to the dashed line 2001 shown.

[0047] The connecting groove 201 does not penetrate the fitting 2. That is, the depth of the connecting groove 201 in the thickness direction of the fitting 2 perpendicular to the mating surface 102 is less than the thickness of the fitting 2 in that direction. When the fitting 2 rotates and rotates to engage with the mating component (such as a fixing component), the rotary switching valve can be in an open or closed state. The mating component is similar to the fitting 1 described above, having one or more sets of corresponding inlet and outlet holes. When the rotary switching valve is in the open state, each connecting groove 201 is opposite to a set of corresponding inlet and outlet holes in the mating component, so that the corresponding inlet and outlet holes are connected. When the rotary switching valve is in the closed state, each connecting groove 201 is offset from at least one of the corresponding set of inlet and outlet holes, so that the corresponding inlet and outlet holes are disconnected from the connection.

[0048] like Figure 3 As shown, the corresponding similar Figure 1 The connecting groove 201 can be configured as three arc-shaped slots evenly distributed on the same circumference, with the outlet and inlet holes of the mating parts shown.

[0049] It is understood that when the rotary switching valve is in the open state, the orthographic projections of each of the connecting grooves 201 and a corresponding set of inlets in the mating component on the contact surface of the fitting 2 and the mating component at least partially overlap, and the orthographic projections of each of the connecting grooves 201 and a corresponding set of outlets in the mating component on the contact surface of the fitting 2 and the mating component at least partially overlap, thus enabling the corresponding inlets and outlets to be connected through the connecting grooves 201. Conversely, when the rotary switching valve is in the closed state, the orthographic projection of each of the connecting grooves 201 on the contact surface of the fitting 2 and the mating component does not overlap with the orthographic projection of at least one of the corresponding set of inlets and outlets on the contact surface of the fitting 2 and the mating component, thus preventing the corresponding inlets and outlets from being connected.

[0050] The mating surface of the accessory 2 and the mating part can be the outer surface of the coating of the accessory 2 located on the mating surface 102.

[0051] It is understood that the specific number and arrangement of the outlet and inlet holes on the fixed parts, as well as the connecting grooves on the rotating parts, can be set according to specific circumstances, and this application does not limit them.

[0052] Please refer to Figure 4 and Figure 5 and combine when necessary Figures 1 to 3 As shown, this application also provides a rotary switching valve 100, which includes a fixing member 1' and a rotating member 2'. The fixing member 1' and the rotating member 2' are fitted together and can rotate relative to each other about a normal line OO' of their mating surface S as a rotation axis, thereby realizing the on / off state of the rotary switching valve 100.

[0053] In some embodiments, the fixing component is accessory 1 as described above, and the rotating component is accessory 2 as described above, which ensures that neither the rotating component nor the fixing component is easily worn.

[0054] Considering that the two relatively rotating and mating structural surfaces are made of different materials, which can better ensure the sealing performance of their fit, the fixing component can be set as accessory 1 as described above, or the rotating component can be set as accessory 2 as described above.

[0055] Since rotating parts are more cost-effective than fixed parts, the fixed part is preferably accessory 1 as described above. The surface of the rotating part is not coated with a coating 20, which helps to ensure the sealing performance of both parts while better controlling product costs.

[0056] like Figure 4 As shown, this description takes the fixed member 1' as the accessory 1 described above, and the rotating member 2' as an example where the surface of the rotating member 2' is not coated with a coating 20. The rotating member 2' has a structure similar to the accessory 2 described above without a coating, and it is also provided with a connecting groove.

[0057] like Figure 4As shown, the rotary switching valve 100 also includes a housing 3 with an inner cavity 301. The housing 3 has two opposing openings 3001 and 3002. A fixing member 1' is fixed to the opening 3002 via a fixing structure 4. A rotating member 2' is disposed in the inner cavity 301 and can rotate to the inside of the fixing member 1' via a rotating shaft assembly. The rotating shaft assembly includes a rotating shaft 8, an elastic member 5, a bearing 6, and a cover 7. A mounting portion 81 is provided at the inner end of the rotating shaft 8. The rotating member 2' is fixed to the mounting portion 81 and can rotate under the rotation of the rotating shaft 8, achieving relative rotational engagement with the fixing member 1'. A portion of the rotating shaft 8 passes through the opening 3001. The elastic member 5 is sleeved on the drive shaft 8, with one end abutting against the mounting portion 81 and the other end abutting against the cover 7. The bearing 6 is disposed between the cover 7 and the housing at the opening 3001.

[0058] In this embodiment, the normal OO' is the same as the axis of rotation 8.

[0059] Based on the above description, when the rotary switching valve 100 is in the open state, the connecting groove of each of the rotating parts 2' is opposite to a set of corresponding inlet and outlet holes in the fixed part 1', so that the corresponding inlet and outlet holes are connected; when the rotary switching valve 100 is in the closed state, the connecting groove of each of the rotating parts 2' is offset from at least one of the corresponding set of inlet and outlet holes in the fixed part 1', so that the corresponding inlet and outlet holes are disconnected.

[0060] It should be noted that the rotary switching valve 100 described above can be used in chromatographs, such as gas chromatographs or liquid chromatographs. The rotary switching valve 100 can be used to control the flow of the fluid being analyzed in the chromatograph. Similarly, the rotary switching valve 100 described above can also be used in mass spectrometers to control the flow of fluid in the chromatograph.

[0061] like Figure 6 As shown, this application also provides a method for manufacturing a fitting for a rotary switching valve. The fitting can be fitted with a corresponding mating part in the rotary switching valve and can rotate relative to the mating part about a normal to the mating surface of the two parts as an axis of rotation, so as to realize the on / off switching of the rotary switching valve. The manufacturing method includes the following steps S101 and S103: In step S101, a component body 10 is provided, the component body 10 having a mating surface 102; In step S103, a coating 20 is provided on the mating surface 102 of the accessory body; the coating 20 includes a first transition bonding layer 21 close to the accessory body 10 and a wear-resistant layer 23 located on the side of the first transition bonding layer 21 away from the accessory body 10; wherein, the hardness of the first transition bonding layer 21 is greater than the hardness of the accessory body 10, and the hardness of the first transition bonding layer 21 is less than the hardness of the wear-resistant layer 23.

[0062] The following is combined Figures 7 to 10 As shown, the example is a second transition bonding layer 22 located between the first transition bonding layer 21 and the wear-resistant layer 23.

[0063] The hardness of the second transition bonding layer 22 is greater than that of the first transition bonding layer 21, and the hardness of the second transition bonding layer 22 is less than that of the wear-resistant layer 23. like Figure 7 In step S101, a component body 10 is provided, the component body 10 having a mating surface 102.

[0064] In some embodiments, step S101, which involves applying the coating 20 to the mating surface 102 of the accessory body, includes the following steps S1011 to S1013: like Figure 8 As shown, in step S1011, the first transition bonding layer 21 is formed on the mating surface 102 of the accessory body by vapor deposition.

[0065] like Figure 9 As shown, in step S1012, the second transition bonding layer 22 is formed on the mating surface 102 of the accessory body by vapor deposition. like Figure 10 As shown, in step S1013, the wear-resistant layer 23 is formed on the side of the first transition bonding layer 21 away from the accessory body 10 by vapor deposition.

[0066] Of course, in other embodiments, where only a first transition bonding layer 21 exists between the wear-resistant layer 23 and the accessory body 10, step S101 of setting the coating 20 on the mating surface 102 of the accessory body may include the following steps S1011 and S1013: In step S1011, the first transition bonding layer 21 is formed on the mating surface 102 of the accessory body by vapor deposition. In step S1013, the wear-resistant layer 23 is deposited on the side of the first transition bonding layer 21 away from the accessory body 10 by vapor deposition.

[0067] In some embodiments, the accessory body 10 is made of austenitic stainless steel, and the first transition bonding layer 21 is made of metal.

[0068] In some embodiments, the wear-resistant layer 23 is made of diamond-like carbon. The thickness of the wear-resistant layer 23 can be 1µm to 10µm.

[0069] In some embodiments, the material of the first transition bonding layer 21 is a metal, at least one of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum and tungsten.

[0070] The thickness of the first transition bonding layer 21 can be 1µm to 10µm; In some embodiments, the material of the second transition bonding layer 22 is at least one of tungsten and tungsten carbide. The thickness of the second transition bonding layer 22 may be 1µm to 10µm.

[0071] Furthermore, prior to step S103, the preparation method may further include the following steps S102 and S104: In step S102, the accessory body 10 is ultrasonically cleaned to remove surface dust, oil, and other foreign matter.

[0072] In step S104, the component body 10 is subjected to Ar ion etching to remove surface oxides and increase the adhesion of the substrate to the coating.

[0073] Other structures of coating 20 and rotary switching valve fittings can be referred to in the above descriptions and will not be repeated here.

[0074] In this application, the structural embodiments and method embodiments described can complement each other without conflict.

[0075] In this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. The terms "multiple" and "several" refer to two or more unless otherwise expressly defined.

[0076] Other embodiments of this application will readily occur to those skilled in the art upon consideration of the specification and practice of the disclosure herein. This application is intended to cover any variations, uses, or adaptations of this application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The specification and examples are to be considered exemplary only, and the true scope and spirit of this application are indicated by the following claims.

[0077] It should be understood that this application is not limited to the precise structure described above and shown in the accompanying drawings, and various modifications and changes can be made without departing from its scope. The scope of this application is limited only by the appended claims.

Claims

1. A fitting for a rotary switching valve, which fits into a corresponding mating part of the rotary switching valve and is capable of rotating relative to the mating part about a normal to their mating surfaces as an axis of rotation, thereby realizing the on / off switching of the rotary switching valve, characterized in that, include: The accessory body has mating surfaces; A coating is provided at least on the mating surface, the coating comprising a first transition bonding layer near the component body and a wear-resistant layer located on the side of the first transition bonding layer away from the component body; wherein, the hardness of the first transition bonding layer is greater than the hardness of the component body, and the hardness of the first transition bonding layer is less than the hardness of the wear-resistant layer. The accessory body has a protruding structure in the middle on one side in the thickness direction, and the outermost surface of the protruding structure is the mating surface; The accessory serves as a fixing component that is fixed in the rotary switching valve; The accessory has multiple through holes that extend through the accessory in the thickness direction. One end of each through hole is located on the side surface of the accessory body facing away from the protruding structure, and the other end is located on the mating surface of the protruding structure. Some of the multiple through holes are inlet holes, and the other part are outlet holes that correspond to the inlet holes. When the accessory is rotatably engaged with the mating part, the rotary switching valve can be in an open or closed state; when the rotary switching valve is in the open state, the inlet is connected to the corresponding outlet; when the rotary switching valve is in the closed state, the inlet is disconnected from the corresponding outlet.

2. The rotary switching valve accessory as described in claim 1, characterized in that, The coating includes a second transition bonding layer located between the first transition bonding layer and the wear-resistant layer; wherein the hardness of the second transition bonding layer is greater than the hardness of the first transition bonding layer, and the hardness of the second transition bonding layer is less than the hardness of the wear-resistant layer.

3. The rotary switching valve accessory as described in claim 2, characterized in that, The main body of the accessory is made of austenitic stainless steel, and the first transition bonding layer is made of metal.

4. The rotary switching valve accessory as described in claim 3, characterized in that, The wear-resistant layer is made of diamond-like carbon; the thickness of the wear-resistant layer is 1µm to 10µm. The first transition bonding layer is made of a metal, including at least one of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten; the thickness of the first transition bonding layer is 1µm to 10µm. The material of the second transition bonding layer is at least one of tungsten and tungsten carbide; the thickness of the second transition bonding layer is 1µm to 10µm.

5. The rotary switching valve fitting as described in any one of claims 1 to 4, characterized in that, The accessory is a rotating component rotatably disposed in a rotary switching valve. At least the middle region of one side surface of the accessory in the thickness direction is the mating surface. The accessory is provided with one or more spaced communicating grooves that are recessed from the mating surface. When the accessory rotates and engages with the mating component, the rotary switching valve can be in an open or closed state. The mating component has one or more sets of corresponding inlet and outlet holes. When the rotary switching valve is in the open state, each of the connecting grooves is opposite to a set of corresponding inlet and outlet holes in the mating component, so that the corresponding inlet and outlet holes are connected. When the rotary switching valve is in the closed state, each of the connecting grooves is offset from at least one of the corresponding set of inlet and outlet holes, so that the corresponding inlet and outlet holes are disconnected.

6. A rotary switching valve, characterized in that, It includes a fixing component and a rotating component, the fixing component and the rotating component are fitted together and can rotate relative to each other about a normal to their mating surface as an axis of rotation, thereby realizing the on and off of the rotary switching valve; Wherein, the fixing member is the accessory as described in claim 1; and / or, the rotating member is the accessory as described in claim 5.

7. A method for preparing a component for a rotary switching valve, used to prepare a component for a rotary switching valve as described in any one of claims 1 to 5, wherein the component can fit with a corresponding mating part in the rotary switching valve, and can rotate relative to the mating part about a normal to their mating surfaces as an axis of rotation, so as to realize the on / off switching of the rotary switching valve, characterized in that, The preparation method includes: A component body is provided, the component body having a mating surface; A coating is provided on the mating surface of the accessory body; the coating includes a first transition bonding layer close to the accessory body and a wear-resistant layer located on the side of the first transition bonding layer away from the accessory body; wherein, the hardness of the first transition bonding layer is greater than the hardness of the accessory body, and the hardness of the first transition bonding layer is less than the hardness of the wear-resistant layer.

8. The method for preparing the rotary switching valve accessory as described in claim 7, characterized in that, Applying a coating to the mating surface of the accessory body includes: The first transition bonding layer is formed on the mating surface of the accessory body by vapor deposition. The wear-resistant layer is formed on the side of the first transition bonding layer away from the component body by means of vapor phase deposition.

9. The method for preparing the rotary switching valve accessory as described in claim 7, characterized in that, The coating includes a second transition bonding layer located between the first transition bonding layer and the wear-resistant layer; wherein the hardness of the second transition bonding layer is greater than the hardness of the first transition bonding layer, and the hardness of the second transition bonding layer is less than the hardness of the wear-resistant layer; the provision of the coating on the mating surface of the accessory body includes: The first transition bonding layer is formed on the mating surface of the accessory body by vapor deposition. The second transition bonding layer is formed on the mating surface of the accessory body by vapor deposition. The wear-resistant layer is formed on the side of the first transition bonding layer away from the component body by means of vapor phase deposition.

10. The method for preparing the rotary switching valve accessory as described in claim 9, characterized in that, The main body of the accessory is made of austenitic stainless steel, and the first transition bonding layer is made of metal.

11. The method for preparing the rotary switching valve accessory as described in claim 10, characterized in that, The wear-resistant layer is made of diamond-like carbon; the thickness of the wear-resistant layer is 1µm to 10µm. The first transition bonding layer is made of a metal, including at least one of titanium, zirconium, hafnium, vanadium, niobium, tantalum, chromium, molybdenum, and tungsten; the thickness of the first transition bonding layer is 1µm to 10µm. The material of the second transition bonding layer is at least one of tungsten and tungsten carbide; the thickness of the second transition bonding layer is 1µm to 10µm.

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