Integrated long steady flow filtering and high-pressure descaling nozzle and manufacturing method thereof

Abstract

The invention relates to the technical field of metal rolling and heat treatment, and discloses an integrated long steady flow filtering and high-pressure descaling nozzle and a manufacturing method thereof. The nozzle comprises a filtering part, a flow stabilizing part and a spraying part, the flow stabilizing part comprises N lengthened flow stabilizing blades distributed in the circumferential direction, the axial length of the flow stabilizing blades accounts for 20%-60% of the total length of the nozzle, the flow stabilizing blades and reinforcing ribs between vertical water inlets of the filtering part integrally cooperate to form a compression-resistant supporting structure, and the total water inlet sectional area of the filtering part is larger than the effective circulation sectional area of the flow stabilizing part. The synergistic effect of beam current, rectification and current stabilization is achieved through the contraction flow channel. Due to the integrally-designed supporting rib structures between the flow stabilizing blades and the reinforcing ribs, water inlet vortexes and flow resistance can be reduced or relieved, the compressive strength of the flow stabilizing blades and the compressive strength of the filtering part can be increased, the structural stability is further improved, and the service life of the nozzle is prolonged. The problems that a traditional nozzle is unstable in structure, poor in turbulence control and short in service life are solved, and the nozzle has good market application prospects.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of metal rolling and heat treatment, in particular to an integrated long-stable-flow filtering and high-pressure descaling nozzle and a manufacturing method thereof. BACKGROUND

[0002] In the process of metal rolling and heat treatment, the nozzle is the core component of high-pressure water descaling, cooling liquid injection and high-pressure blowing process, and its striking force, injection precision and pressure resistance directly determine the surface quality of the product, the cooling effect and the production line efficiency. Taking high-pressure water descaling as an example, the original and secondary oxide scales on the metal surface during hot rolling can easily cause quality problems such as product surface indentation, defects and oxide scale embedding, and seriously wear the surface of the roller, affecting the service life of the rolling mill. Therefore, in order to improve the surface quality of the metal and reduce the wear rate of the roller, the high-pressure water descaling technology is widely used to remove the oxide scale before metal rolling. However, with the development of high-end manufacturing industry, the conventional nozzle cannot meet the increasingly stringent performance requirements in the fields of high-pressure descaling, blowing and cooling, especially in terms of stability, durability and descaling effect under high pressure and ultra-high pressure (≥20 MPa) service conditions.

[0003] The split design of the traditional nozzle is prone to plastic deformation under the impact of high-pressure water flow or gas flow, especially under extreme working conditions such as large water or gas pressure and water hammer. The filter is easily deformed and flattened. This not only causes the injection direction to be unstable, thereby affecting the descaling and cooling effect, but also changes the inlet flow of the nozzle, thereby reducing the injection pressure and efficiency. Patent CN108057528B discloses a nozzle structure in which the flow guide surface of the jet flow guide is at least partially placed in the filter area. Although this structure improves the pressure resistance of the filter by using the flow guide surface, the change in the position of the flow guide surface also leads to a decrease in the water inlet flow of the filter, and increases the water inlet resistance, thereby reducing the jet impact force. Patent CN106423675B discloses a method of placing a sleeve inside or outside the filter outlet to reduce water turbulence and increase the support force of the filter inlet. However, similarly, the stronger the support force of the sleeve, the larger the coverage area of the filter, and the more the water inlet flow is weakened. In addition, due to the turbulence inside the nozzle, conventional nozzles often use a long constant-section cavity structure design, such as the nozzle structures disclosed in patents CN101306409B and CN108057528B, which set a length of corrugated pipe downstream of the lock body or a length of smooth section that is 2-7 times the length of the contraction section downstream of the contraction section. Although this structure design slows down the turbulence and reduces the flow resistance to some extent, it occupies too much internal space of the nozzle, which limits the ability of the nozzle structure to accelerate the jet flow, and has poor coordination with the directional jet flow guide, and also does not have the function of supporting the filter inlet.

[0004] Therefore, in conclusion, developing a new type of nozzle that can maintain stable structure under high pressure conditions, has excellent pressure resistance, and has better descaling and cooling effect is of great significance to improve the surface quality and production efficiency of metal materials. SUMMARY

[0005] Therefore, the present application provides an integrated long-steady-flow filtering and high-pressure descaling nozzle and a manufacturing method thereof, mainly aiming to solve the problems of easy plastic deformation failure of the filtering part of the descaling nozzle, excessive energy loss of the steady-flow part, and weak jet impact force and easy divergence of the jet angle of the jet part under high-pressure and super-high-pressure working conditions, and finally poor descaling or cooling effect.

[0006] To achieve the above-mentioned purpose, the present application provides an integrated long-steady-flow filtering and high-pressure descaling nozzle, which comprises a filtering part, a steady-flow part, and a jet part arranged in sequence along the fluid flow direction, the steady-flow part comprises N elongated steady-flow vanes arranged uniformly in the circumferential direction, N≥3, and the axial length L b of the steady-flow vane satisfies the following proportional relationship with the total length L b of the descaling nozzle: L b =(0.2~0.6)L.

[0007] In some embodiments, the filtering part comprises M vertical water inlet channels arranged axially in parallel and connecting partitions between adjacent water inlet channels, M≥N; the inner side of at least N connecting partitions is provided with a reinforcing rib integrally formed with the steady-flow vane. The radial width W r of the steady-flow vane satisfies the following relationship with the radial width W b of the reinforcing rib: W r >W c ; the inner diameter width W r of the connecting partition satisfies the following relationship with the thickness T c of the reinforcing rib: W r >T r .

[0008] In some embodiments, the axial length L i of the reinforcing rib satisfies the following relationship with the axial length L i of the vertical water inlet channel: L r ≥L s .

[0009] In some embodiments, the steady-flow part further comprises a support rib arranged upstream of the steady-flow vane and downstream of the reinforcing rib and integrally formed with both; the axial length L r of the support rib satisfies the following relationship with the axial length L b of the steady-flow vane and the axial length L s of the reinforcing rib: L r =(0.08~0.22)L s=(0.04~0.13)L b .

[0010] In some embodiments, the support rib is connected to the upstream of the flow stabilizing blade, and the radial width W s of the flow stabilizing blade is greater than the radial width W b of the support rib, and the relationship between the radial width W r of the support rib and the radial width W b of the flow stabilizing blade satisfies: W s ≥ W r .

[0011] In some embodiments, the effective flow passage area S b of the flow stabilizing blade and the total water inlet cross-sectional area S f of the filtering part satisfy: S b ≤ 0.165 S f .

[0012] In some embodiments, the flow stabilizing blade comprises, in sequence along the fluid flow direction, a water inlet transition section, a flow stabilizing main section, and a water outlet transition section; the chamfer angle α1 of the water outlet transition section and the chamfer angle α2 of the water inlet transition section satisfy: α1 > α2; wherein α1 = 45° ± 5°, and α2 = 30° ± 5°.

[0013] In some embodiments, the flow stabilizing part further comprises a flow stabilizing cavity arranged downstream of the flow stabilizing blade along the fluid flow direction; the injection part comprises a contraction cavity arranged downstream of the flow stabilizing cavity and connected to the flow stabilizing cavity; the axial length L w of the flow stabilizing cavity and the axial length L x of the contraction cavity satisfy: L w < L x .

[0014] In some embodiments, the positions of the inner connections of the nozzle are all adopted as circular arc transition structures.

[0015] Another aspect of the present application provides a manufacturing method based on the above-described descaling nozzle, specifically, a manufacturing method of an integrated forming structure, which comprises precision mechanical machining and a metal powder selective laser sintering forming process.

[0016] According to the technical scheme, the integrated long-steady-flow filtering and high-pressure descaling nozzle has the following advantages: the lengthened steady-flow vane has the effects of beam flow (acceleration), rectification (direction) and steady flow (reduction of flow resistance), and the lengthening of the steady-flow vane enhances the comprehensive effect of beam flow and rectification, which is more suitable for high-pressure and super-high-pressure nozzles with obvious water inflow turbulence, thereby improving the descaling, purging and cooling effects; the lengthened steady-flow vane forms an integrated reinforcing rib in the vertical water inflow channel of the filtering part, which reduces the stress concentration of the nozzle and improves the bearing strength of the nozzle to high-pressure water; the support rib structure between the steady-flow vane and the reinforcing rib is also integrally designed, which reduces or relieves the water inflow vortex and flow resistance, increases the compression strength of the steady-flow vane and the filtering part, further improves the stability of the structure, and prolongs the service life of the nozzle.

[0017] The above description is only a summary of the technical scheme of the present application, in order to more clearly understand the technical means of the present application, the present application can be implemented according to the content of the specification, and in order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the following specific embodiments of the present application are described. BRIEF DESCRIPTION OF DRAWINGS

[0018] The drawings described herein are used to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute an improper limitation on the present application. In the drawings:

[0019] Figure 1 is a nozzle structure schematic diagram of some embodiments of the present application;

[0020] Figure 2 is a nozzle sleeve part structure schematic diagram of some other embodiments of the present application;

[0021] Figure 3 is Figure 2 structure schematic diagram of the B-B and C direction observation surfaces in the embodiments;

[0022] Figure 4 is Figure 2 is an enlarged structure schematic diagram of the block D in the embodiments.

[0023] BRIEF DESCRIPTION OF DRAWINGS 1 - filtering part; 2 - steady-flow part; 3 - jet part; 11 - vertical water inflow channel; 12 - connecting partition; 13 - reinforcing rib; 14 - horizontal water inflow channel; 21 - steady-flow vane; 22 - support rib; 23 - steady-flow cavity; 211 - water inflow transition section; 212 - steady-flow main section; 213 - water outflow transition section; 31 - nozzle head; 32 - sealing rubber ring; 33 - nozzle body; 34 - positioning sleeve; 341 - contraction cavity. DETAILED DESCRIPTION

[0024] The present application is described herein with reference to particular embodiments for a purpose of clarity and understanding. Those of ordinary skill in the art will appreciate that other advantages and embodiments of the application can be practiced or carried out without departing from the spirit and scope of the application. Detailed descriptions of certain embodiments of the application are presented herein for the purpose of enabling one of ordinary skill in the art to make and use the application. Certain details of the application are presented for the purpose of illustration and description and are not intended to limit the scope of the application. The description of the embodiments of the application is not intended to be exhaustive or to be limited to the precise form disclosed. Many modifications and variations are possible in light of this disclosure. It is intended that the scope of the application be limited not with the specific form of the description but rather by the claims included herein.

[0025] In the description of the present application, it should be noted that the terms "longitudinal", "transverse", "inner", "outer", and the like indicate the orientation or positional relationship of the object described for the purpose of facilitating the description of the present disclosure and simplifying the description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the present application. When the absolute position of the object described changes, the relative positional relationship may also change accordingly.

[0026] In the description of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "provided with", "arranged", "connected" and the like should be broadly understood, for example, can be fixedly connected, can be detachably connected, or integrally connected; can be directly connected, or indirectly connected through an intermediate medium; can be internal communication of two elements. For those of ordinary skill in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0027] As Figure 1 As shown in the embodiment, a one-piece long-steady-flow filtering and high-pressure descaling nozzle has a total length L = 145.0 mm, and includes a filtering part 1, a steady-flow part 2 and a spraying part 3 arranged in sequence along the fluid flow direction. During service of the descaling nozzle, the filtering part 1 is usually placed in the water inlet pipeline, and includes 12 axially parallel vertical water inlet channels 11 and connecting partitions 12 between adjacent water inlet channels, wherein: the axial length L of the vertical water inlet channel 11 is 43.0 mm, and the width is 1.2 mm, for filtering impurities in high-pressure water; the inner diameter width (chord length) W of a single connecting partition 12 is 1.2 mm, for connecting the adjacent water inlet channels. i =43.0mm, and the width is 1.2mm, for filtering impurities in high-pressure water; the inner diameter width (chord length) W of a single connecting partition 12 is 1.2mm, for connecting the adjacent water inlet channels. c=1.4mm. In addition, the filter section 1 also includes a rectangular bottom, on which 12 horizontal water inlet channels 14, each 1.2mm wide, are evenly arranged circumferentially and communicate with the vertical water inlet channel 11. In some embodiments, the vertical water inlet channel 11 of the filter section 1 does not extend axially to the bottom of the nozzle, and is a separate design from the bottom structure. Furthermore, in other embodiments, the bottom of the filter section may be spherical or rectangular, and the number and width of the horizontal water inlet channels evenly arranged circumferentially may be inconsistent with those of the vertical water inlet channels and they are not connected.

[0028] In existing technologies, conventional high-pressure nozzles typically incorporate cored or coreless guide vanes within the nozzle, often positioned downstream of filters or gently sloping bellows. These vanes reduce or mitigate inlet turbulence, decreasing flow resistance while providing directional flow. Considering the flow-stabilizing effect of a relatively long, fixed-section cavity structure, the length of these guide vanes currently constitutes a small proportion of the total nozzle length, typically below 15%. In contrast, this invention discloses an extended flow-stabilizing vane structure that fully utilizes the limited space within the nozzle. N flow-stabilizing vanes, each with an axial length of 0.2 to 0.6 times the total nozzle length, are arranged downstream of the filter section, where N ≥ 3. By adjusting the number, axial length, radial width, and thickness parameters of these vanes, the structure achieves a synergistic effect of stream concentrating, rectifying, and stabilizing flow.

[0029] like Figure 1 As shown in the embodiment, the flow stabilizing section 2 of the descaling nozzle includes 12 elongated flow stabilizing blades 21 evenly arranged circumferentially, with an axial length L b =50.5mm≈0.35L, radial width W b =3.0mm, thickness is 0.6mm. In filter section 1, its total inlet cross-sectional area S f ≈677mm 2 The effective flow cross-sectional area S of the flow stabilizing blade 21 is determined by the sum of the inlet cross-sectional areas of all vertical inlet channels 11 and horizontal inlet channels 14. b ≈78mm 2 The cross-sectional area of ​​the nozzle inner diameter channel is subtracted from the cross-sectional area of ​​all flow-stabilizing blades (radial width W). bThe difference between the product of the thickness and the area of the effective flow passage of the filter part is determined. Since the nozzle is in the process of high-pressure water, there are irregular eddies and strong lateral mixing in the filter part, the speed fluctuates randomly, the turbulence is intensified, and the design of three or more steady flow blades can divide the fluid in the filter part into multiple parallel channels, inhibit lateral mixing, and make the speed distribution smoother. The design of such straightening structure not only has low energy loss, but also makes the jet less likely to diverge and has better impact effect. According to Bernoulli's principle, the reduction of the free flow area of the fluid will convert pressure energy into kinetic energy, thereby increasing the flow rate, and vice versa. Therefore, in fact, in order to reduce the initial flow rate and avoid the direct impact of high-pressure water flow to cause severe turbulence, the total water inlet area S f of the filter part should be much larger than the effective flow area S b of the steady flow blade area, and after the high-pressure water flow enters the nozzle, the design of the steady flow blade can also shrink the water flow entering the filter part once, increase the water flow rate, and improve the impact of the subsequent jet. Unlike the structure of the traditional nozzle which is only directional, the effective flow area S b of the steady flow blade area in the present application is basically constant, which can not only utilize the longer fluid flat section to slow down the turbulence in the nozzle or accelerate the dissipation of turbulence, reduce the flow resistance, but also accelerate the fluid more stably to avoid new turbulence and further utilize the blade structure to comb the fluid to enhance the flow guiding effect, finally achieving the purpose of effectively improving the impact of the jet and improving the descaling effect.

[0030] Unlike the prior art which tries to increase the ratio of S b and S f , in some embodiments of the present application, the ratio of S b ≤0.165S f , such as the embodiment shown in Figure 1 , S b ≈0.115S f . This parameter range is also based on the design limitation of the lengthened steady flow blade, which not only fully utilizes the steady flow effect of the blade of a certain length, but also can increase the flow effect of the blade to a certain extent, increase the water flow rate under the premise of ensuring steady flow, and then strengthen the impact of the jet, to meet the increasingly stringent requirements of high-end manufacturing for high-pressure jet descaling.

[0031] If the flow rate suddenly changes or the direction suddenly changes in the nozzle, new eddies may be generated, which will disperse the water flow and increase the flow resistance. Therefore, in order to avoid the occurrence of turbulence in the transition area, a gradual transition area can be provided in the area where the effective flow area of the steady flow blade changes at both ends, to reduce energy loss and reduce turbulence. As shown in Figure 1As shown, in some embodiments, the flow stabilizing blade 21 of the high-pressure descaling nozzle of the present application comprises, in sequence along the fluid flow direction, a water inlet transition section 211, a flow stabilizing main section 212, and a water outlet transition section 213. In addition, although the flow stabilizing blade has a transition region for the water inlet from front to back, the proportion of the transition region is only less than 15% of the total length, which not only does not affect the flow stabilizing effect of the flow stabilizing main section, but also positively affects the flow stabilizing of the nozzle as a whole. In some embodiments, as shown in Figure 1 , the spray part 3 comprises a nozzle head 31, a sealing rubber ring 32, a nozzle body 33, and a positioning sleeve 34. In other embodiments, the vertical water inlet channel and the nozzle bottom structure are designed in a split type, as shown in Figure 2 , the vertical water inlet channel 11 and the area where the flow stabilizing part 2 is located can constitute a nozzle sleeve component, the upper end of which is provided with a thread and can be connected with the nozzle body 33 of the spray part 3. In addition, as shown in Figure 2 , in the embodiment, the chamfer angle α1 of the water outlet transition section 213 is 45°, and the chamfer angle α2 of the water inlet transition section 211 is 30°. This is because the turbulence of the vertical water inlet channel after the water inlet is more significant compared to the water inlet after the flow stabilizing by the flow stabilizing blade, so the transition region should be more gentle, and the angle should also be smaller. In addition, if the angle of the transition region is too large, it will occupy more flow stabilizing space, and if it is too small, the flow stabilizing effect will not be obvious. Therefore, the chamfer of the transition region should satisfy α1 = 45° ± 5° and α2 = 30° ± 5°.

[0032] As shown in Figure 1 and Figure 2 , the flow stabilizing part 2 further comprises a flow stabilizing cavity 23, which is arranged downstream of the flow stabilizing blade 21 along the fluid flow direction and connected with the water outlet transition section 213; the positioning sleeve 34 comprises a contraction cavity 341, which is arranged downstream of the flow stabilizing cavity 23 and connected with the flow stabilizing cavity 23, wherein the axial length L w of the flow stabilizing cavity 23 is 11.0 mm, and the axial length L x of the contraction cavity 341 is 16.1 mm. Compared with conventional nozzles, in the present application, the fluid after being stabilized by the flow stabilizing blade does not have to pass through a long flow stabilizing structure with a constant cross section, and has enough space for secondary contraction and acceleration of the fluid before the jet, so in the present embodiment, the axial length L w of the flow stabilizing cavity can be set to be smaller than the axial length L x of the contraction cavity.

[0033] In high pressure and super high pressure service environment, the filter part of the descaling nozzle is directly exposed to the water inlet pipe and bears a large mechanical pressure, and several water inlet channels are opened on it, so the overall pressure resistance of this part is poor, and plastic deformation such as flattening is easy to occur, which is one of the common nozzle failure types. In view of the above problems, the present application provides a structure of setting reinforcing ribs in the filter part, which can stably support the filter part of the nozzle under high pressure, water hammer and other conditions, so that it is not easy to produce deformation. As shown in Figures 2 to 4 In the embodiment, the inner side of the 12 connecting partitions 12 is provided with a reinforcing rib 13 which is integrally formed with the flow stabilizing blade 21, and the axial length L r of the reinforcing rib is shorter than the axial length L i of the vertical water inlet channel 11, wherein, in order to ensure sufficient water inlet flow and avoid the increase of water inlet resistance, the radial width W r of the reinforcing rib is 1.0mm, which is smaller than the radial width W b of the flow stabilizing blade 21, and the thickness T r of the reinforcing rib is 0.6mm, which is the same as the thickness of the flow stabilizing blade 21 and smaller than the inner diameter width W c of the connecting partition 12. The flow stabilizing and filtering integrated cooperative structure of the internal flow stabilizing blade extending to the reinforcing rib between the water inlet ports of the filter part not only can better disperse stress, optimize flow channel and reduce flow resistance, but also can greatly improve the pressure resistance of the nozzle under high pressure or super high pressure, prolong the service life of the descaling nozzle. In addition, considering the change of the total water inlet cross-sectional area and the control of the material cost, in other embodiments, the length of part or all of the reinforcing ribs can be smaller than or equal to the length of the vertical water inlet channel under the premise of ensuring that the filter part has sufficient supporting force; when the number of vertical water inlet channels is greater than the number of flow stabilizing blades, the inner side of part of the connecting partitions can not be provided with reinforcing ribs.

[0034] When the nozzle is subjected to fluid impact, due to the multiple vertical water inlet channels in the filter part, on the one hand, the continuity of the overall structure is weakened, so that the stress concentration of the connecting partition plate (reinforcing rib) area is more likely to occur when subjected to pressure; on the other hand, the connecting partition plate is located at the most upstream of the nozzle, when the high-pressure water flow enters, it first impacts the area between the connecting partition plates, according to the principle of fluid mechanics, the sudden change of flow passage cross-sectional area (water inlet channel opening) will cause the local pressure to increase suddenly, and a greater impact force and pressure will be generated around the connecting partition plate; and when the high-pressure water flow starts and stops or the flow suddenly changes, the water hammer effect will also produce an instantaneous impact pressure (up to 3 times the steady-state pressure), since the reinforcing rib is located inside the connecting partition plate, it will also directly bear such dynamic load, which is easy to cause fatigue failure. Similarly, after the water flow enters the steady flow blade, the effective flow cross-sectional area decreases suddenly, although the blade can divide the flow, but the increase of flow velocity will also make the steady flow blade bear a larger pressure and dynamic load; at the same time, compared with the reinforcing rib, the cross-sectional area of the steady flow blade is larger, which will also result in a larger impact force and dynamic load amplitude. In order to further optimize the long-steady flow filtering synergy of the descaling nozzle, the application also discloses a support rib structure integrated with the steady flow blade and the reinforcing rib to disperse the initial impact borne by the reinforcing rib and the steady flow blade, and optimize the flow field distribution. For example Figure 4 As shown in the embodiment, the support rib 22 is arranged in the steady flow part 2, which is arranged upstream of the steady flow blade 21 and downstream of the reinforcing rib 13 and forms an integrated molding structure with the two. Among them, the support rib 22 is directly connected with the inner wall of the nozzle sleeve, and its radial width W s =1.0mm, which is the same as the radial width W r of the reinforcing rib 13 and smaller than the radial width W b of the steady flow blade 21; its axial length L s =5.5mm, and the axial lengths of the reinforcing rib 13 and the steady flow blade 21 satisfy L s =0.18L r , L s =0.11L b .

[0035] The reasons for the above design are as follows: (1) The support ribs upstream of the flow stabilizer blades can not only directly bear the initial high-pressure impact of the water inlet channel area, but also transmit part of the pressure axially to the inner wall of the connected nozzle, avoiding excessive pressure concentration at the root of the flow stabilizer blades. They can also fix the flow stabilizer blades and limit the vibration amplitude of the flow stabilizer blades under high pressure through axial constraint, thus preventing deformation or fatigue fracture under high pressure. (2) Compared with the reinforcing ribs, the axial direction of the support ribs is directly connected to the inner wall of the nozzle sleeve. Structurally, there is no weakening of the water inlet channel, resulting in better pressure resistance. Its position downstream of the reinforcing ribs and its integral structure with the reinforcing ribs can effectively share the burden of the water inlet channel. The dynamic load of the area (such as water hammer impact pressure) prevents the connecting baffle (reinforcing rib) from plastic deformation due to the sudden increase of local pressure, and further improves its compressive strength; (3) The integrated collaborative structure of the long flow stabilizer blades, support ribs and reinforcing ribs extending to the filter section in the manufacturing process can not only reduce the stress concentration and flow resistance at the connection of each component and enhance the stability of the overall nozzle structure, but also indirectly provide additional support for the reinforcing ribs and flow stabilizer blades. Through the role of the support ribs in the transmission of impact force, the compressive strength and fatigue life of the reinforcing ribs and flow stabilizer blades are improved at the same time, thereby enhancing the nozzle's resistance to high pressure or ultra-high pressure fluids. In addition, in some other embodiments, the radial width W of the support ribs can be set. s Greater than the radial width W of the stiffener r By utilizing a gradual transition treatment through support ribs or a combination of support ribs and the inlet transition section of the flow stabilizer blades, the cross-sectional area of ​​the flow channel changes smoothly, avoiding eddies caused by sudden expansion or contraction. This ensures that the support ribs can effectively transfer the load to the inner wall of the nozzle, while simultaneously... s <W b This also avoids excessively increasing flow resistance. For stiffeners, the axial length L of the supporting stiffener... s If too short (e.g., <0.08L) r If L), then it cannot effectively transfer stress and alleviate stress concentration in the reinforcing ribs; while if L s Too long (e.g., >0.22L) r If L is too large, it will occupy too much axial space, reducing the effective working length of the flow stabilizer blades. For flow stabilizers, if L... s <0.04L b Because the supporting ribs are too short, their stiffness is insufficient, and their effect on mitigating the vibration of the flow-stabilizing blades is limited; while when L s >0.13L b At the same time, the flow stabilization effect of the flow stabilizing blades is also weakened.

[0036] In some embodiments, such as Figures 1-3As shown, in order to avoid turbulence and reduce flow resistance, the connecting parts of the contraction cavity 341 and the steady flow cavity 23, the steady flow main section 212 and the water inlet / outlet transition section 211 / 213, the water inlet transition section 211 or the steady flow blade 21 and the support rib 22 all adopt a circular arc transition structure.

[0037] The conventional high-pressure nozzle usually adopts a split blade structure, uses welding or casting process, but has the following problems: (1) structural defects: split welding causes stress concentration, which is easy to crack under high pressure; (2) precision limitation: it is difficult to realize micron-level flow channel (such as steady flow blade thickness 0.6mm) by casting process; (3) material waste: complex structure needs multi-process machining, and the material utilization rate is low. In view of the foregoing one-piece long steady flow filtering and collaborative high-pressure descaling nozzle, the application provides a manufacturing method of one-piece forming structure, including precision mechanical machining and metal powder selective laser sintering forming process (SLM), which is suitable for manufacturing complex flow channel structure with high precision and high strength.

[0038] Through simulation of actual working conditions, the impact force, precision and pressure resistance of the nozzle provided by the application are detected, and it is found that compared with the conventional nozzle, the impact force is increased by about 3%~10%, the stability of the spraying precision is also obviously improved, and under the same working conditions, the high-pressure deformation resistance of the nozzle of the application is increased by about 30%~50%.

[0039] The terms "comprising" and "having" and any variations thereof in the specification and claims and above-described drawings are intended to cover both the exclusive and non-exclusive inclusion, for example, a process, method, system, product or apparatus that includes a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units that are not clearly listed or inherent to these processes, methods, products or apparatuses.

[0040] Finally, it should be pointed out that the above examples are only used to illustrate the technical solutions of the application and are not limiting, although the application has been described in detail with reference to the preferred embodiments, those skilled in the art should understand that the technical solutions of the application can be modified or replaced by equivalents without departing from the purpose and scope of the technical solutions, which should be covered in the scope of the claims of the application.

Claims

1. An integrated long-flow stabilizing filter and high-pressure descaling nozzle, comprising a filter section, a flow stabilizing section, and a spray section arranged sequentially along the fluid flow direction, characterized in that, The flow stabilizing section includes N elongated flow stabilizing blades evenly arranged circumferentially, where N ≥ 3, and the axial length L of the flow stabilizing blades is... b The total length L of the descaling nozzle satisfies the following proportional relationship: L b =(0.2~0.6)L.

2. The descaling nozzle according to claim 1, characterized in that, The filtration section includes M vertical water inlet channels arranged in parallel along the axis and connecting partitions between adjacent water inlet channels, where M ≥ N; At least N of the connecting partitions have reinforcing ribs on their inner sides that are integrally formed with the flow stabilizing blades; The radial width W of the flow stabilizer blade b The radial width W of the reinforcing rib r Satisfy: W b >W r ; The inner diameter width W of the connecting partition c With respect to the thickness T of the reinforcing rib r Satisfy: W c >T r .

3. The descaling nozzle according to claim 2, characterized in that, The axial length L of the reinforcing rib r The axial length L of the vertical water inlet channel i Satisfy: L i ≥L r .

4. The descaling nozzle according to claim 2, characterized in that, The flow stabilizing section also includes a support rib, which is located upstream of the flow stabilizing blade and downstream of the reinforcing rib along the fluid flow direction and forms an integral molded structure with the two. The axial length L of the supporting rib s The axial length L of the reinforcing rib r axial length L of the flow stabilizer blade b Satisfy: L s =(0.08~0.22)L r L s =(0.04~0.13)L b .

5. The descaling nozzle according to claim 4, characterized in that, The support rib is connected upstream of the flow stabilizer blade, and its radial width W s With the radial width W of the flow stabilizer blade b , Radial width W of the reinforcing rib r The relationship satisfies: W b >W s ≥W r .

6. The descaling nozzle according to claim 1, characterized in that, The effective flow cross-sectional area S of the flow stabilizing blade b The total inlet cross-sectional area S of the filter section f Satisfy: S b ≤0.165S f .

7. The descaling nozzle according to claim 1, characterized in that, The flow stabilizing blade includes an inlet transition section, a flow stabilizing main section, and an outlet transition section connected sequentially along the fluid flow direction; the chamfer angle α1 of the outlet transition section and the chamfer angle α2 of the inlet transition section satisfy: α1>α2; where α1=45°±5°, α2=30°±5°.

8. The descaling nozzle according to claim 1, characterized in that, The flow stabilizing section further includes a flow stabilizing cavity, which is located downstream of the flow stabilizing blade along the fluid flow direction; The injection section includes a contraction chamber, which is located downstream of the flow stabilizing chamber and connected to the flow stabilizing chamber; The axial length L of the flow stabilizing cavity w axial length L of the contraction chamber x Satisfy: L w <L x .

9. The descaling nozzle according to any one of claims 5, 7 or 8, characterized in that, All connections within the nozzle employ a rounded transition structure.

10. A method for manufacturing a descaling nozzle according to any one of claims 2-8, characterized in that, The manufacturing method of the integral molded structure includes precision machining and selective laser sintering of metal powder.

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