Valve body of servo valve and servo valve

Abstract

The invention discloses a valve body of a servo valve and the servo valve, and relates to the technical field of servo valves.The valve body of the servo valve is internally provided with a containing space, the end face of the valve body is provided with a liquid inlet communicating the outside with the containing space, and a liquid inlet channel is formed between the liquid inlet and the containing space; a filter element integrally formed with the valve body and / or detachably connected with the valve body is arranged in the liquid inlet and / or the liquid inlet channel. According to the filter element integrally formed with the valve body, the step of installing the filter element in the manufacturing process is reduced, the manufacturing efficiency is improved, and meanwhile the problems that the filter element is difficult to install and tedious in replacement step are solved; the detachably connected filter element is embedded in the inner wall of the valve body, disassembly is easy, replacement and installation are convenient and fast, the two filter element arrangement modes are combined, the filtering effect of the filter element can be improved through multi-layer arrangement, then the filtering effect is guaranteed without arranging overlapping of the filtering area on the single-layer filter element, and therefore the technology for producing and manufacturing the filter element is simpler and more convenient.

Description

Technical Field

[0001] This invention relates to the field of servo valve technology, and particularly to a servo valve body and a servo valve. Background Technology

[0002] In modern industry, servo valves are key components for controlling fluid flow. However, in practical applications, especially when it comes to valve bodies involving fluid control, traditional additive manufacturing of valve bodies still faces some challenges. One of these challenges is the need to integrate filter elements inside the valve body. The function of the filter element is to filter solid particles or impurities in the fluid to protect other components of the system from wear and clogging. Traditional filter elements usually need to be installed separately after the valve body is manufactured. This not only increases the complexity of manufacturing and assembly but may also lead to problems such as poor sealing or inaccurate filter element positioning. Furthermore, replacing the filter element also requires disassembling most of the servo valve parts, making the operation very complicated. Summary of the Invention

[0003] The main objective of this invention is to propose a servo valve body and a servo valve, aiming to solve the problems of difficult installation and replacement of the filter element in the servo valve body.

[0004] To achieve the above objectives, the present invention proposes a servo valve body with an internal accommodating space and an inlet on one end face connecting the inlet to the external environment. An inlet channel is formed between the inlet and the accommodating space. A filter element integrally formed with and / or detachably connected to the valve body is disposed within the inlet and / or the inlet channel, with no overlap in filtration area on the same filter element. The detachably connected filter element is embedded in the inner wall of the valve body. The integrally formed filter element reduces the steps involved in filter element installation during manufacturing, improving manufacturing efficiency. It also solves the problems of difficult filter element installation and cumbersome replacement procedures. Furthermore, the integral forming ensures consistent forming difficulty regardless of the filter element's location. The detachably connected filter element, embedded in the inner wall of the valve body, is easy to disassemble and convenient to replace. By combining these two filter element configurations, multiple layers can be used to improve filtration efficiency. This eliminates the need for overlapping filtration areas on a single filter layer to ensure filtration effectiveness, thus simplifying the filter element manufacturing process.

[0005] In one embodiment, the filter element, contoured within the inlet channel, extends and / or branches along with the inlet channel. This design, by contouring the filter element to the inlet channel, prevents the filter element from colliding with the valve body's inner wall under liquid impact, thus avoiding wear on the valve body's inner wall or filter screen and reducing its service life. Furthermore, this design facilitates the extension of the filter element within the inlet channel; after the liquid enters the valve body, it is filtered even while flowing within the inlet channel, and the longer the filter element, the higher the filtration efficiency and the better the filtration effect.

[0006] In one embodiment, the filter element at the liquid inlet is a detachably connected filter element; the filter element with the conformal design of the liquid inlet channel is integrally formed with the valve body using additive manufacturing. As the first stage of liquid filtration, the filter element at the liquid inlet filters out more impurities. Timely cleaning or replacement of filter elements that cannot be completely cleaned can significantly improve the filtration effect. Additive manufacturing minimizes material waste, as it uses only the necessary materials to form the object structure and involves more convenient post-processing steps. This not only reduces material usage but also saves raw materials and energy, thereby alleviating environmental pressure and reducing production costs. Secondly, it offers strong flexibility and customization capabilities. Traditional manufacturing processes typically require numerous molds and processing equipment, while additive manufacturing technology eliminates the need for these additional tools. With only digital design data, the desired product can be printed directly. This flexibility makes product design and production more convenient, enabling rapid product iteration and upgrades, and facilitating personalized customization.

[0007] Furthermore, additive manufacturing technology can create complex structures, which is very difficult or even impossible in traditional manufacturing processes. By depositing materials layer by layer, additive manufacturing technology can create objects with complex internal structures, such as honeycomb structures and microporous materials.

[0008] In one embodiment, the filter element disposed at the liquid inlet is flush with the end face of the liquid inlet or recessed into the liquid inlet channel. This recessed or flush arrangement of the filter element at the liquid inlet prevents it from protruding relative to the valve body, thus ensuring the overall structural integrity.

[0009] In one embodiment, the filter element includes a filter screen for filtration and a filter handle connecting the valve body and the filter screen, with a gap between the filter screen and the inner wall of the valve body. The filter handle is used to fix the inner wall of the valve body to the filter screen, preventing the filter element from breaking or deforming under the impact of liquid. The gap between the filter screen and the inner wall of the valve body serves two purposes: first, it prevents the filter screen from touching the inner wall of the valve body when the filter element undergoes slight deformation; second, it allows liquid to permeate through the perimeter of the filter screen for filtration, increasing the filtration area and further improving filtration efficiency.

[0010] In one embodiment, when the number of filter elements is at least two layers, the filter elements are stacked; the filter screen pore size of the layer of filter elements closer to the liquid inlet end face is larger than that of the layer of filter elements farther from the liquid inlet end face. Different pore sizes filter impurities of different sizes. By setting up a double-layer filter, larger impurities are filtered first, followed by smaller impurities, effectively preventing filter clogging and further improving filtration efficiency and effect.

[0011] In one embodiment, the rod diameters of the filter screens may be the same or different, ranging from 0.01 mm to 5 mm. Without changing the material, a larger rod diameter results in better structural performance of the filter screen, a lower likelihood of damage from external forces, and a longer service life. The rod diameter directly affects the size and number of filter pores. With the pore size remaining constant, a smaller rod diameter increases the number of pores, thereby improving the filtration effect. Furthermore, if the rod diameter is too small, multiple layers can be used to enhance the structural performance of the filter screen, i.e., increasing the thickness of the filter screen to ensure its structural strength.

[0012] In one embodiment, the cross-sectional area of ​​the liquid inlet channel from the inlet to the accommodating space is optimized through simulation calculation using a genetic algorithm. When the liquid flow rate is constant, a smaller cross-sectional area of ​​the liquid inlet channel results in a faster liquid flow rate, while a larger cross-sectional area results in a slower flow rate. Optimal structure and cross-sectional area of ​​the liquid inlet channel are obtained through genetic algorithm simulation design, which helps to accelerate the liquid flow rate within the liquid inlet channel and improve the filtration efficiency of the liquid within the filter screen.

[0013] This invention also proposes a servo valve, comprising a valve body as described above. The valve body has an internal accommodating space, and its end face has an inlet and an outlet connecting the outside to the accommodating space. An inlet channel is formed between the inlet and the accommodating space. A filter element integrally formed with and / or detachably connected to the valve body is disposed within the inlet and / or the inlet channel. When oil enters from the inlet, it is filtered by the filter element before entering the accommodating space, and flows out from the outlet after operation. This servo valve has the same beneficial effects as the valve body of the servo valve described above, which will not be elaborated further here.

[0014] In one embodiment, the valve body and filter element are printed using the same material or different materials. Different materials produce structures with different properties. This method allows for the targeted selection of materials for printing the valve body and filter element, ensuring that the finished filter element and valve body each meet the requirements, thereby satisfying the usage needs. The technical solution of this invention reduces the steps of installing the filter element during the manufacturing process by using a filter element integrally formed with the valve body, thereby improving manufacturing efficiency. It also solves the problems of difficult filter element installation and cumbersome replacement steps. Furthermore, the integral molding ensures that the molding difficulty is consistent regardless of the location of the filter element. The detachable filter element is embedded in the inner wall of the valve body, making disassembly simple and replacement convenient. By combining the two filter element setting methods, multiple layers can be set to improve the filtration effect of the filter element. Therefore, there is no need to overlap the filtration area on a single layer of filter element to ensure the filtration effect, thus making the filter element manufacturing process simpler. Attached Figure Description

[0015] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0016] Figure 1 A schematic diagram of the valve body of a servo valve provided by the present invention; Figure 2 A three-dimensional structural diagram of the filter element in another embodiment of the servo valve body provided by the present invention. Figure 1 ; Figure 3 A schematic diagram of the filter element and valve body embedded structure in another embodiment of the servo valve provided by the present invention; Figure 4 A three-dimensional structural schematic diagram of the inlet channel in another embodiment of the servo valve body provided by the present invention; Figure 5 A three-dimensional structural diagram of the filter element in another embodiment of the servo valve body provided by the present invention. Figure 2 ; Figure 6 This is a three-dimensional structural schematic diagram of an embodiment of the servo valve provided by the present invention.

[0017] Explanation of icon numbers: 100. Valve body; 11. Liquid inlet; 12. Liquid inlet channel; 13. Receiving space; 14. Filter element; 121. Limiting groove; 141. Filter screen; 142. Filter handle; 200. Servo valve. The realization of the objective, functional features and advantages of the present invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0018] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0019] It should be noted that if directional indicators (such as up, down, left, right, front, back, etc.) are involved in the embodiments of this invention, these directional indicators are only used to explain the relative positional relationships and movement of the components in a specific posture. If the specific posture changes, the directional indicators will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. For those skilled in the art, the specific meaning of the above terms in this application can be understood according to the specific circumstances.

[0020] Furthermore, if the embodiments of the present invention involve descriptions using terms such as "first," "second," etc., these descriptions are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Furthermore, the use of "and / or" or "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but only if they are feasible for those skilled in the art. If the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0021] In modern industry, servo valves are key components for controlling fluid flow. However, in practical applications, especially when it comes to valve bodies involving fluid control, traditional additive manufacturing of valve bodies still faces some challenges. One of these challenges is the need to integrate filter elements within the valve body. The function of the filter element is to filter solid particles or impurities in the fluid, protecting other components of the system from wear and clogging. Traditionally, filter elements need to be installed separately after the valve body is manufactured. This not only increases the complexity of manufacturing and assembly but can also lead to problems such as poor sealing or inaccurate filter element positioning. Furthermore, replacing the filter element requires disassembling most of the servo valve parts, making the operation very complicated. Therefore, a servo valve is needed to solve the problem of difficult filter element replacement within the servo valve body.

[0022] Please combine Figures 1-3 The present invention proposes a valve body 100 of a servo valve, wherein an accommodating space 13 is provided inside the valve body 100, and an inlet 11 communicating with the outside and the accommodating space 13 is provided on the end face of the valve body 100. An inlet channel 12 is provided between the inlet 11 and the accommodating space 13. A filter element 14 integrally formed with the valve body 100 and / or detachably connected is provided in the inlet 11 and / or the inlet channel 12, and the filtration area on the same filter element 14 does not overlap; the detachably connected filter element 14 is embedded in the inner wall of the valve body 100.

[0023] It should be noted that either the liquid inlet 11 or the liquid inlet channel 12 can be equipped with a filter element 14, or both can be equipped with a filter element 14. There is no restriction here. Since the filter element 14 is integrally formed with the valve body 100, the specific location of the filter element 14 has no impact on the processing time of the overall valve body 100, and also avoids the situation where the valve body 100 needs to be disassembled for installation or replacement of the filter element 14 after it is formed.

[0024] Specifically, in one embodiment of the present invention, the filter element 14 provided at the liquid inlet 11 is a detachable filter element 14; the filter element provided in the liquid inlet channel 12 is integrally formed with the valve body 100 by additive manufacturing process and extends inward along the liquid inlet channel 12.

[0025] Understandably, to facilitate installation or replacement of filter element 14, the filter element near the liquid inlet 11 is designed as a detachable structure and is embedded in the inner wall of the valve body 100, making installation and removal more convenient. To ensure sufficient filtration of the liquid, the filter element 14 in the liquid inlet channel 12 can increase the filtration area to a certain extent, that is, increase the overall length of the filter element 14. The liquid can be filtered from the end face of the filter element 14 and also from the surrounding area of ​​the filter element 14. Since the inwardly extending filter element 14 is inconvenient to remove, it can be directly integrally formed with the valve body 100 through additive manufacturing process, and the filter element 14 can be rinsed and cleaned by repeatedly introducing liquid. Therefore, there is no need for overlapping filtration areas on the inwardly extending filter element 14, such as pleated design or stacked design, which would affect the difficulty of cleaning the filter element 14 and the final cleaning effect.

[0026] It should be noted that additive manufacturing can minimize material waste. The additive manufacturing process uses only the required materials to form the object structure and has more convenient post-processing steps. This not only reduces the amount of material used, but also saves raw materials and energy consumption, thereby reducing environmental pressure and saving production costs. Secondly, it offers strong flexibility and customization capabilities. Traditional manufacturing processes typically require numerous molds and processing equipment, while additive manufacturing technology eliminates the need for these additional tools. With only digital design data, the desired product can be printed directly. This flexibility makes product design and production more convenient, enabling rapid product iteration and upgrades, and facilitating personalized customization.

[0027] Furthermore, additive manufacturing technology can create complex structures, which is very difficult or even impossible in traditional manufacturing processes. By depositing materials layer by layer, additive manufacturing technology can create objects with complex internal structures, such as honeycomb structures and microporous materials.

[0028] It can be seen that the filter element 14 in the liquid inlet channel 12 is integrally formed with the valve body 100 through additive manufacturing, which reduces costs, makes production and manufacturing more convenient, and makes the connection more secure.

[0029] In addition, the use of additive manufacturing process for one-piece molding can prevent powder and particles in the liquid inlet channel 12 from falling into key components such as valve core or valve sleeve and causing wear and blockage compared to conventional one-piece molding process.

[0030] Understandably, the filter element 14, which is integrally formed with the valve body 100, reduces the steps of installing the filter element 14 during the manufacturing process, improves manufacturing efficiency, and solves the problem of difficult installation of the filter element 14. The integral forming makes the molding difficulty of the filter element 14 consistent regardless of its location, and allows for multi-layer settings to improve the filtration effect of the filter element 14.

[0031] It should be noted that the filter element 14 located in the liquid inlet channel 12 is relatively long because it extends towards the receiving space 13, making disassembly inconvenient. Therefore, it is directly integrally formed with the valve body 100. However, for ease of cleaning, the filter element 14 does not need to be designed with overlapping filtration areas to increase the filtration effect, and is more inclined to a simple structure that is easy to clean. However, the filter element 14 located in the liquid inlet 11 is not restricted. This filter element 14 is detachably connected and serves as the first layer of liquid filtration structure, so it can be set as a pleated or stacked structure.

[0032] Specifically, in one embodiment of the present invention, the filter element 14 is only provided at the liquid inlet 11 and is detachably connected to the valve body 100. The filter element 14 can be configured as a pleated or stacked structure. When the filter element 14 extends into the liquid inlet channel 12, it can also be configured as a design with no overlapping filtration area when the liquid inlet channel 12 extends inward.

[0033] Specifically, in one embodiment of the present invention, the filter element is only disposed in the liquid inlet channel 12 and is integrally formed with the valve body 100, and the filter element 14 extends inward in the liquid inlet channel 12, and the filter element 14 is configured to have a structure without overlapping filtration areas.

[0034] Specifically, in one embodiment of the present invention, the filter element 14 includes a filter element 14a disposed at the liquid inlet 11 and a filter element 14b disposed in the liquid inlet channel 12. The filter element 14a disposed at the liquid inlet 11 has a pleated or stacked structure, and the filter element 14b disposed in the liquid inlet channel 12 has an overlapping structure without filtration area.

[0035] Understandably, compared to the conventionally removable and replaceable filter element 14 located inside the valve body 100, the filter element 14 of the present invention is removably located at the port of the liquid inlet 11 or integrally formed with the inner wall of the valve body 100, making cleaning more convenient. It can be cleaned by repeatedly passing liquid flow through the valve body 100 in both directions. After cleaning, the filter element 14 can continue to be used. This reusable feature greatly reduces the damage and destruction to the component structure during disassembly, the cost of replacing the filter element 14, increases the service life of the valve body 100, and reduces production and maintenance costs.

[0036] In addition, to ensure the sealing of liquid flow, a sealing ring is required for the valve body 100 when the filter element 14 is replaced. The sealing ring is used to seal the gap between the filter element 14 and the inner wall of the valve body 100, so that the liquid will only flow into the filter element 14 and flow out from the filter screen 141 after filtration. The servo valve body 100 of the present invention, which is integrally formed with the filter element 14 and the valve body 100, does not require a sealing ring, thereby achieving a sealing effect.

[0037] Furthermore, in the case of a filter element 14 installed in an embedded manner, where the limiting groove 121 and the filter handle 142 fit tightly and the contact surfaces are firmly engaged, a sealing effect can be achieved without the need for a sealing element.

[0038] In an embodiment of the present invention, the filter element 14 disposed at the liquid inlet 11 is flush with the end face of the liquid inlet 11 or recessed into the liquid inlet channel 12.

[0039] It should be noted that when the inlet 11 and the end face of the valve body 100 are on the same plane, this design helps to ensure the flatness and aesthetics of the end face of the valve body 100. However, if the end face of the valve body 100 has a groove and the inlet 11 is located in the groove, the filter element 14 located in the inlet 11 can protrude slightly outward from the valve body 100, and the degree of protrusion shall not exceed the depth of the groove.

[0040] Therefore, the specific setting method of the filter element 14 at the liquid inlet 11 is not limited, and the actual effect of ensuring the flatness of the end face of the valve body 100 shall prevail.

[0041] Understandably, the filter element 14 is recessed in the liquid inlet 11 or flush with the end face, so that the filter element 14 does not protrude relative to the valve body 100, thereby ensuring the flatness of the overall structure.

[0042] In an embodiment of the present invention, the diameter of the liquid inlet 11 is 1 to 50 mm.

[0043] Specifically, the diameter of the liquid outlet can be 1mm, 1.5mm, 7mm, 10mm, 23.7mm, 35mm, 46mm, or 50mm; Preferably, the diameter of the liquid outlet is 2~35 mm.

[0044] Please combine Figures 3-5 In an embodiment of the present invention, the filter element 14 is configured to conform to the liquid inlet channel 12, and the filter element 14 extends and / or branches within the liquid inlet channel 12.

[0045] It should be noted that the length of the filter element 14 set in the liquid inlet 11 and / or liquid inlet channel 12 is not limited, that is, the filtration area of ​​the filter element 14 is not considered. The longer the filter element 14 is, the larger the filtration area is, the lower the possibility of clogging, and the better the filtration effect. This can result in a longer maintenance cycle and fewer maintenance times, thereby reducing maintenance costs. Therefore, there is no limit to the specific length of the filter element 14, and it shall be based on the actual production requirements.

[0046] The filter element 14 is designed to follow the shape of the liquid inlet channel 12, meaning that the filter element 14 bends synchronously with the liquid inlet channel 12, and branches are added at the same time.

[0047] Specifically, a filter element 14 can be installed from the liquid inlet 11 to the connection between the liquid inlet channel 12 and the receiving space 13, that is, throughout the entire liquid inlet channel 12. Therefore, the filter element 14 needs to be set in the same shape as the liquid inlet channel 12.

[0048] Understandably, with this design, after the liquid enters the valve body 100, it will be filtered by the filter element 14 even if it flows in the liquid inlet channel 12. And if the filter element 14 is long enough, the filtration efficiency will be higher and the filtration effect will be better. The contoured design of the filter element 14 and the liquid inlet channel 12 also prevents the filter element 14 from colliding with the inner wall of the valve body 100 under liquid impact, thereby avoiding wear on the inner wall of the valve body 100 or the filter screen 141, which would reduce the service life. This design also helps the filter element 14 to extend within the liquid inlet channel 12.

[0049] In an embodiment of the present invention, when the liquid inlet channel 12 includes branches or forks, the filter element 14 will simultaneously open branches or forks to filter liquids from different paths. Alternatively, when the inlet channel 12 includes branches or forks, the filter element 14 does not branch or fork as the path increases, but only bends and extends along one path. The filter element 14 has a filtration structure added to the side near the fork to enhance the filtration effect on liquids not covered by the inlet channel 12. Alternatively, when the liquid inlet channel 12 includes branches or forks, the filter element 14 extends along the liquid inlet channel 12 to the fork or branch, enhancing the filtration effect of the filter element 14 and thus ensuring that the liquid in the branch of the liquid inlet channel 12 is free of impurities or has few impurities.

[0050] In embodiments of the present invention, the cross-section of the liquid inlet channel 12 includes, but is not limited to, a circle, a square, an ellipse, or a star shape; Preferably, the cross-section of the liquid inlet channel 12 is circular, square, or elliptical.

[0051] In an embodiment of the present invention, the filter element 14 includes a filter screen 141 for filtration and a filter handle 142 connecting the valve body 100 and the filter screen 141, with a gap between the filter screen 141 and the inner wall of the valve body 100.

[0052] It should be noted that the filter handle 142 is used to fix the inner wall of the valve body 100 and the filter screen 141, and at the same time forms a sealing effect on the gap between the filter element 14 and the inner wall of the valve body 100, which is equivalent to the sealing ring installed for the traditional replaceable filter element 14, preventing the filter screen 141 from breaking or deforming and displacing due to the impact of liquid flow.

[0053] Specifically, to prevent the filter handle 142 from breaking or deforming, and to prevent the filter screen 141 from deforming, the material of the filter element 14 can be changed during the one-piece molding process, thereby improving the structural performance of the filter element 14.

[0054] More specifically, a limiting groove 121 is provided on the inner wall of the liquid inlet channel 12 near the liquid inlet 11 for embedding and fixing the filter handle 142 of the filter element 14 to prevent the filter element 14 from shifting and thus affecting the filtration effect. Optionally, the filter handle 142 and the contact surface of the limiting groove 121 are completely fitted together to form a seal, preventing liquid from flowing into the liquid inlet channel 12 from the limiting groove 121. Optionally, the connection between the liquid inlet 11 and the liquid inlet channel 12 is set as a slope, that is, the cross-sectional area here gradually decreases as it goes deeper into the liquid inlet channel 12, and the cross-sectional area reaches the minimum value at the limiting groove 121. With this design, the filter element 14 can be directly inserted from the liquid inlet 11, which facilitates the installation operation of the filter element 14. When the limiting groove 121 and the filter handle 142 are fully fitted, the filter element 14 is difficult to fall off under the action of friction, thereby achieving the fixation of the filter element 14.

[0055] In embodiments of the present invention, the material of the filter element 14 includes, but is not limited to, stainless steel, polyester, polypropylene, PTFE, mold steel, ceramics, etc. Preferably, the filter element 14 is made of stainless steel, mold steel, or ceramic.

[0056] In addition, the gap between the filter screen 141 and the inner wall of the valve body 100 serves two purposes: first, to prevent the filter screen 141 from touching the inner wall of the valve body 100 when the filter element 14 undergoes slight deformation; and second, to allow liquid to permeate through the perimeter of the filter screen 141 for filtration, thereby increasing the filtration area and further improving the filtration efficiency.

[0057] In embodiments of the present invention, the rod diameter of the filter screen 141 may be the same or different, and is 0.01 mm to 5 mm.

[0058] Optionally, the rod diameter of the filter screen 141 can be 0.01 mm, 0.05 mm, 0.10 mm, 0.23 mm, 0.35 mm, 0.46 mm, 0.52 mm, 0.91 mm, 1.35 mm, 2.00 mm, 3.42 mm, 4.00 mm, 4.37 mm, 4.89 mm, or 5.00 mm. Preferably, the diameter of the filter screen 141 is 0.01 mm-3 mm.

[0059] It should be noted that, without changing the material, the larger the rod diameter, the better the structural performance of the filter screen 141, the lower the possibility of damage from external forces, and the longer the service life. The rod diameter of the filter screen 141 directly affects the size and number of filter pores. With the filter pore size remaining unchanged, the smaller the rod diameter, the more pores there will be, thereby improving the filtration effect. In the case of a rod diameter that is too small, the structural performance of the filter screen 141 can be enhanced by setting multiple layers, that is, by increasing the thickness of the filter screen 141 to ensure the structural strength of the filter screen 141.

[0060] The rod diameter of filter screen 141 is not limited here. It can be determined based on the material of the filter screen used, ensuring both filtration effectiveness and mechanical properties. Furthermore, the rod diameter of filter screen 141 is related to its area, which in turn is related to the size of the servo valve. Different servo valve models require different oil flow rates and thus different filtration effects. Therefore, the rod diameter and the size of the filtration gap must be considered comprehensively.

[0061] Specifically, the filtration level of filter 141 can be 4 to 12. Preferably, in an embodiment of the present invention, the filter 141 has a filtration level of 6-12.

[0062] In an embodiment of the present invention, when the number of filter elements 14 is at least two layers, the filter elements 14 are stacked; the pore size of the filter screen 141 of the layer of filter elements 14 near the end face of the liquid inlet 11 is larger than the pore size of the filter screen 141 of the layer of filter elements 14 away from the end face of the liquid inlet 11.

[0063] Understandably, the filter screen 141 has different pore sizes and filters impurities of different sizes. By setting up a double-layer filter screen 141, larger impurities are filtered first and then smaller impurities are filtered, which effectively prevents the filter screen 141 from clogging, further improves filtration efficiency, and enhances filtration effect.

[0064] It should be noted that the number of filter elements 14 in the liquid inlet channel 12 can be more than one, such as two or more. In order to prevent clogging or to achieve graded filtration, the filter screen 141 of the filter element 14 closer to the receiving space 13 has smaller gaps, which is used to filter finer impurities.

[0065] Specifically, the filter element 14 is provided at the liquid inlet 11, and multiple filter elements 14 are stacked to achieve multi-stage filtration of the incoming liquid.

[0066] In an embodiment of the present invention, the cross-sectional area of ​​the liquid inlet channel 12 from the liquid inlet 11 to the accommodating space 13 is optimized by simulation calculation using a genetic algorithm.

[0067] Specifically, based on the simulation results of the genetic algorithm, the cross-sectional area of ​​the liquid inlet channel 12 gradually decreases from the liquid inlet 11 to the accommodating space 13.

[0068] It should be noted that when the liquid flow rate is constant, the smaller the cross-sectional area of ​​the liquid inlet channel 12, the faster the liquid flow rate, and the larger the cross-sectional area, the slower the flow rate. The optimal structure and optimal cross-sectional area of ​​the liquid inlet channel 12 are obtained through genetic algorithm simulation design, which helps to accelerate the liquid flow rate in the liquid inlet channel 12 and accelerate the filtration efficiency of the liquid in the filter screen 141. When the liquid flow rate is constant, the smaller the cross-sectional area of ​​the liquid inlet channel 12, the faster the liquid flow rate. This design helps to accelerate the liquid flow rate in the liquid inlet channel 12 and improve the filtration efficiency of the liquid in the filter screen 141.

[0069] Understandably, the cross-sectional area of ​​the inlet channel 12 gradually decreases from the inlet port 11 to the accommodating space 13, and finally sprays out from the throttling orifice. This design can make the oil flow rate through each throttling orifice consistent or have very small differences, thereby ensuring that the oil sprayed out from the throttling orifice makes the valve core subjected to uniform force.

[0070] The technical solution of the present invention reduces the steps of installing the filter element 14 in the manufacturing process by using the valve body 100 and the filter element 14 integrally formed, thereby improving manufacturing efficiency and solving the problem of difficult installation of the filter element 14. The integral forming makes the forming difficulty comparable regardless of where the filter element 14 is placed, and multiple layers can be set to improve the filtration effect of the filter element 14.

[0071] Please see Figure 6 The present invention also proposes a servo valve 200, which includes the valve body 100 of the servo valve as described above. The specific structure of the valve body 100 of the servo valve as described above refers to the above embodiments. Since the servo valve adopts all the technical solutions of all the above embodiments, it has at least all the beneficial effects brought about by the technical solutions of the above embodiments, which will not be described in detail here.

[0072] The valve body 100 has an internal accommodating space 13, and the end face of the valve body 100 has an inlet 11 and an outlet that connect the outside to the accommodating space 13. An inlet channel 12 is provided between the inlet 11 and the accommodating space 13. A filter element 14 integrally formed with the valve body 100 is provided in the inlet 11 and / or the inlet channel 12. When oil enters from the inlet 11, it is filtered by the filter element 14 and enters the accommodating space 13, and flows out from the outlet after operation.

[0073] The above description is merely an exemplary embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural transformations made using the contents of the present invention specification and drawings under the technical concept of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A valve body for a servo valve, characterized in that: The valve body has an internal accommodating space, and the end face of the valve body has a liquid inlet that connects to the outside and the accommodating space. A liquid inlet channel is provided between the liquid inlet and the accommodating space. A filter element is integrally formed with the valve body and / or detachably connected to the liquid inlet and / or the liquid inlet channel, and the filtration area on the same filter element does not overlap. The detachably connected filter element is embedded in the inner wall of the valve body.

2. The valve body of the servo valve as described in claim 1, characterized in that: The filter element installed at the liquid inlet is a detachable filter element; the filter element with the liquid inlet channel is integrally formed with the valve body through additive manufacturing process.

3. The valve body of the servo valve as described in claim 1, characterized in that: The filter element is shaped and installed within the liquid inlet channel, extending and / or branching along with the liquid inlet channel.

4. The valve body of the servo valve as described in claim 1, characterized in that: The filter element installed at the liquid inlet is flush with the end face of the liquid inlet or recessed into the liquid inlet channel.

5. The valve body of the servo valve as described in claim 1, characterized in that: The filter element includes a filter screen for filtration and a filter handle connecting the valve body and the filter screen, with a gap between the filter screen and the inner wall of the valve body.

6. The valve body of the servo valve as described in claim 5, characterized in that: When the number of filter elements is at least two layers, the filter elements are stacked. The filter screen pore size of the filter element closest to the liquid inlet end face is larger than that of the filter element furthest from the liquid inlet end face.

7. The valve body of the servo valve as described in claim 5, characterized in that: The diameter of the filter rods may be the same or different, ranging from 0.01 mm to 5 mm.

8. The valve body of the servo valve as described in claim 1, characterized in that: The cross-sectional area of ​​the liquid inlet channel from the inlet to the accommodating space was optimized through simulation calculation using a genetic algorithm.

9. A servo valve, comprising the valve body of a servo valve as described in any one of claims 1-8, characterized in that: The valve body has an internal accommodating space, and the end face of the valve body has an inlet and an outlet that connect the outside to the accommodating space. An inlet channel is provided between the inlet and the accommodating space. A filter element is integrally formed with the valve body and / or detachably connected to it in the inlet and / or the inlet channel. When oil enters from the inlet, it is filtered by the filter element and enters the accommodating space. After the servo valve is operated, it flows out from the outlet.

10. The servo valve as described in claim 9, characterized in that: The valve body and filter element can be printed using the same material or different materials.

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