CN117123796A - Laval ring hole spray disc and processing method thereof - Google Patents

Abstract

The application relates to the technical field of powder preparation, in particular to a Laval ring hole spray disc and a processing method thereof. The Laval ring hole spray disc comprises a spray disc upper cover, a spray disc lower cover and a spray disc ring hole spray tube part arranged between the spray disc upper cover and the spray disc lower cover, wherein the spray disc upper cover and the spray disc lower cover can be formed by machining, the spray disc ring hole spray tube part is formed by 3D printing, an air inlet hole is formed in the spray disc upper cover or the spray disc lower cover, an air flow buffer area is arranged between the spray disc upper cover and the spray disc lower cover, a plurality of groups of Laval spray tubes penetrating through the upper surface and the lower surface of the spray disc ring hole spray tube part are circumferentially arranged, the contraction section of the Laval spray tube is communicated with an air flow buffer flow passage, and the expansion section penetrates through the lower surface of the spray disc lower cover. According to the Laval ring hole spray disc and the processing method thereof, the ring hole spray disc is assembled after being processed in a split mode, so that the surface treatment of a runner is facilitated, the surface smoothness of the runner is improved, and the influence on an airflow field is reduced; meanwhile, only the spray pipe component with the spray disk ring hole is printed, so that the processing cost is reduced.

Description

Laval ring hole nozzle disc and its processing method

Technical field

The present application relates to the field of powder preparation, and in particular to a Laval ring hole nozzle disc and its processing method.

Background technique

The nozzle disc is the core component of the gas atomization preparation of metal powder. The high-pressure argon gas is accelerated through the nozzle disc to increase the kinetic energy of the gas, crushing and solidifying the molten metal to form metal powder. The acceleration performance of the nozzle disc on the gas directly affects the sphericity and satellite powder of the powder. and powder yield.

The Laval nozzle structure first shrinks and then expands. In the contraction section, the flow speed accelerates as the cross section decreases, reaching the sonic speed at the throat. In the expansion section, the transonic fluid flows faster as the cross section decreases, reaching supersonic speed at the nozzle outlet. sonic state.

At present, the gas atomization powder-making nozzle disk adopts the Laval ring-slit structure. The Laval ring-slit nozzle disk is not a complete Laval structure and has limited acceleration effect on argon gas. The Laval nozzle first shrinks and then expands. The entrance diameter is 4-6mm, the throat diameter is 1-2mm, and the outlet diameter is 2-4mm. It is difficult to process Laval nozzles of this size with current machining technology. Laser selective melting metal 3D printing technology, with a printing accuracy of ±0.05mm, can realize the printing and molding of small-sized Laval nozzles through 3D printing technology, and can realize the production of aerosolized Laval ring hole nozzle disks; however, the nozzle disk contains an air inlet runner , the air flow buffer flow channel and the air flow elbow flow channel (contraction acceleration section), the entire gas flow channel is very long, and the angle between the flow channels is large, making it difficult to post-process the smoothness of the internal flow channel surface and affecting the distribution of the air flow field.

Contents of the invention

This application provides a Laval ring hole nozzle plate to solve the problem of difficult treatment of the internal flow channel surface. This application also provides a method for processing the Laval ring hole nozzle disk applied to the Laval ring hole nozzle disk.

In a first aspect, the application provides a Laval ring-hole nozzle disk, which includes a nozzle disk upper cover, a nozzle disk lower cover, and a nozzle disk ring-hole nozzle component assembled between the nozzle disk upper cover and the nozzle disk lower cover; The nozzle plate annular hole nozzle component is provided with multiple sets of Laval nozzles along the circumferential direction, and any Laval nozzle penetrates the upper and lower surfaces of the nozzle disc annular hole nozzle component; the nozzle disc upper cover and the nozzle disc lower cover are sealed and fit together. An annular airflow buffer channel is formed between the two. An air inlet hole is provided in one of the upper cover of the nozzle plate and the lower cover of the nozzle disc. The airflow buffer channel connects the air inlet hole and the contraction section of all Laval nozzles. The expansion section of the Laval nozzle penetrates to the lower surface of the lower cover of the nozzle plate.

In some embodiments, a first connection hole is opened at the axis of the upper cover of the spray plate, the top of the nozzle component of the annular hole of the spray plate is sealingly connected to the inner wall of the first connection hole, and a second connection hole is opened at the axis of the lower cover of the spray plate. The bottom of the connecting hole and the nozzle component of the nozzle plate annular hole is sealingly connected to the inner wall of the second connecting hole.

In some embodiments, a first hollow portion is provided on the lower surface of the nozzle plate upper cover, the air inlet hole is opened along the radial direction of the nozzle plate upper cover, and the first hollow portion fits the upper surface of the nozzle plate lower cover to form an airflow buffer channel. ;

Or, a second hollow portion is provided on the upper surface of the lower cover of the spray plate, the air inlet hole is opened in the radial direction of the lower cover of the spray plate, and the second hollow portion is fitted to the lower surface of the upper cover of the spray plate to form an airflow buffer channel;

Alternatively, a first hollow portion is formed on the lower surface of the upper cover of the spray plate, and a second hollow portion is formed on the upper surface of the lower cover of the spray plate. The first hollow portion and the second hollow portion cooperate to form an airflow buffer channel.

In some embodiments, a first annular groove is formed on the top periphery of the upper cover of the spray plate, and a first sealing ring is provided in the first annular groove; and/or a second annular groove is formed on the bottom periphery of the lower cover of the spray plate, and a second annular groove is formed on the outer periphery of the bottom of the lower cover of the spray plate. A second sealing ring is provided in the groove.

In some embodiments, a first external thread is provided on the top periphery of the nozzle component of the nozzle disk ring hole, and a first threaded connection section adapted to the first external thread is provided on the inner wall of the first connection hole; and/or, the nozzle disk ring A second external thread is provided on the bottom periphery of the hole nozzle component, and a second threaded connection section adapted to the second external thread is provided on the inner wall of the second connection hole.

In some embodiments, a matching sealing structure is provided between the lower surface of the spray plate upper cover and the upper surface of the spray plate lower cover, and the matching sealing structure is provided on the outer periphery of the airflow buffer channel.

In some embodiments, the Laval annular orifice nozzle plate satisfies at least one of the following:

A pair of air intake holes are opened at 180° intervals;

The Laval nozzle is arranged symmetrically along the circumference of the nozzle component of the nozzle disk annular hole;

The axis of any Laval nozzle is at an angle of 22.5°-25° with the axis of the nozzle component of the nozzle disk annular hole;

The inlet diameter of the contraction section of any Laval nozzle near the airflow annulus area is 4mm, the diameter of the throat is 1mm, the outlet diameter of the expansion section is 2mm, the length of the contraction section is 8mm, and the length of the expansion section is 10mm;

The outer peripheral parts of the nozzle plate upper cover and the nozzle plate lower cover have corresponding fastening holes along the circumferential direction and are connected through fasteners.

In the second aspect, this application provides a method for processing the Laval ring hole spray disk, which is applied to the processing and production of the aerosolized Laval ring hole spray disk according to any one of the above claims, including:

Process the nozzle plate upper cover and the nozzle plate lower cover respectively, 3D print and initially generate the nozzle plate annular hole nozzle parts;

Carry out machining on the initially generated nozzle plate annular hole nozzle parts to complete the assembly surface;

Seal the top of the nozzle part of the nozzle plate annular hole to the upper cover of the nozzle plate, seal the bottom of the nozzle part of the nozzle plate annular hole to the lower cover of the nozzle plate, and keep the lower surface of the upper cover of the nozzle plate and the upper surface of the lower cover of the nozzle plate Sealing fit and firmly connecting the two.

In some embodiments, the step of machining the nozzle plate ring hole nozzle component to complete the assembly surface includes:

A second annular groove is provided on the bottom periphery of the nozzle component of the nozzle disk annular hole, and a first annular groove is provided on the top periphery of the nozzle component of the nozzle disk annular hole;

The steps for sealing the top of the nozzle component of the nozzle plate annular hole to the upper cover of the nozzle disc, and sealing the bottom of the nozzle component of the nozzle disc annular hole to the lower cover of the nozzle disc include:

Install a first sealing ring in the first annular groove, and install the top of the annular hole nozzle component of the spray plate to the center of the bottom of the upper cover of the spray plate;

Install a second sealing ring in the second annular groove, and install the bottom of the nozzle component of the annular hole of the spray plate to the center of the bottom of the lower cover of the spray plate.

In some embodiments, the steps of processing the upper cover of the spray disk and the lower cover of the spray disk respectively are:

The upper cover and lower cover of the spray disc are machined and formed, and a third annular groove is provided on the lower surface of the upper cover of the spray disc and/or the upper surface of the lower cover of the spray disc;

A fastening hole is provided for the upper cover of the spray plate and the lower cover of the spray plate, and the fastening hole penetrates at least one of the upper cover of the spray plate and the lower cover of the spray plate;

The steps to keep the lower surface of the spray plate upper cover and the upper surface of the spray plate lower cover sealed and firmly connected are:

Set a third sealing ring in the third annular groove, fit the upper cover of the spray plate and the lower cover of the spray plate and keep their fastening holes aligned, and install the fasteners into the fastening holes.

Compared with the existing technology, the above technical solutions provided by the embodiments of the present application have the following advantages:

Through 3D printing technology, small-sized Laval nozzles can be printed and formed to solve the problem of Laval ring hole nozzle disc processing;

The Laval ring hole nozzle plate is set up separately. The upper cover and lower cover of the nozzle plate can be machined. Only the nozzle plate ring hole nozzle part is printed. The Laval nozzle is not hidden inside the part, which facilitates post-processing of the flow channel. , improve the smoothness of the flow channel surface;

The Laval ring hole nozzle plate is designed as a separate piece, and the nozzle plate upper cover and nozzle plate lower cover are machined to avoid the limitation of supporting the 3D printing of large-aperture parts. The airflow formed by the assembly of the nozzle plate upper cover and the nozzle lower cover The buffer flow channel is larger;

Only the nozzle plate ring hole nozzle parts are 3D printed, the printing size is smaller and the cost is lower;

The nozzle plate annular hole nozzle adopts Laval structure, which can accelerate the air flow to supersonic speed and have stronger kinetic energy.

The processing method of the Laval ring hole nozzle disk provided by the embodiment of the present application is applied to the processing of the above-mentioned Laval ring hole nozzle disk and has the same beneficial effect.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the invention and together with the description serve to explain the principles of the invention.

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those of ordinary skill in the art, It is said that other drawings can be obtained based on these drawings without exerting creative labor.

One or more embodiments are exemplified by the pictures in the corresponding drawings. These illustrative illustrations do not constitute limitations to the embodiments. Elements with the same reference numerals in the drawings are represented as similar elements. Unless otherwise stated, the figures in the drawings are not intended to be limited to scale.

Figure 1 is a longitudinal sectional view of the Laval ring hole nozzle plate provided by the embodiment of the present application;

Figure 2 is an assembly diagram of Figure 1;

Figure 3 is a longitudinal sectional view of the upper cover of the spray plate in Figure 1;

Figure 4 is a visual diagram of the nozzle plate ring hole nozzle component initially formed by 3D printing;

Figure 5 is a longitudinal sectional view of Figure 4;

Figure 6 is a longitudinal sectional view of the nozzle component of the nozzle disk annular hole after machining;

Figure 7 is a longitudinal sectional view of the lower cover of the spray plate in Figure 1;

FIG. 8 is a flow chart of a method for processing a Laval ring hole nozzle disc according to an embodiment of the present application.

Explanation of reference symbols:

1. The upper cover of the spray plate; 11. The first connection hole; 111. The first threaded connection section;

2. Spray plate annular hole nozzle component; 21. First annular groove; 22-first external thread; 23. Laval nozzle; 24. Second external thread; 25. Second annular groove;

3. Lower cover of the spray plate; 31. Second connection hole; 311. Second threaded connection section; 32. Air inlet;

4. Air flow buffer channel; 5. Third annular groove; 6. First sealing ring; 7. Second sealing ring; 8. Third sealing ring; 9. Fastening hole.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments These are part of the embodiments of this application, but not all of them. Based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the scope of protection of this application.

The following disclosure provides many different embodiments or examples for implementing different structures of the invention. In order to simplify the disclosure of the present invention, the components and arrangements of specific examples are described below. Of course, they are merely examples and are not intended to limit the invention. Furthermore, the present invention may repeat reference numbers and/or letters in different examples. This repetition is for purposes of simplicity and clarity and does not by itself indicate a relationship between the various embodiments and/or arrangements discussed.

For ease of description, spatial relative terms may be used herein to describe the relative position or movement of one element or feature relative to another element or feature as shown in the figures. These relative terms are, for example, "internal", " "Outside", "inside", "outside", "under", "under", "above", "above", "front", "back", etc. Such spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if the position of the device in the figure is flipped, the posture changes, or the state of motion changes, then these directional indications will also change accordingly, for example: described as "under other elements or features" or "under other elements" Elements that are "below" or "below" the other elements or features will then be oriented "above" or "above" the other elements or features. Thus, the example term "below" may include an orientation of above and below. The device may be otherwise oriented (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In order to solve the technical problems in the prior art that the Laval ring hole nozzle disk is difficult to process and the internal flow channel surface is difficult to process, this application provides a Laval ring hole nozzle disk, which facilitates processing of the internal flow channel surface and improves the gas flow field distribution. ; At the same time, it reduces the processing difficulty and processing cost.

Referring to Figures 1 and 2, the embodiment of the present application provides a Laval annular hole spray plate. The annular hole spray plate adopts a split design and mainly includes a spray plate upper cover 1, a spray plate lower cover 3 and a spray plate ring hole spray plate. Pipe part 2 consists of three parts. The lower surface of the spray plate upper cover 1 and the outer periphery of the upper surface of the spray plate lower cover 3 are in close contact with each other. The spray plate annular hole nozzle component 2 is installed in the center between the two. The spray plate upper cover 1 and the spray plate lower cover are After the cover 3 is fitted, an annulus-shaped airflow buffer flow channel 4 is formed with the nozzle plate annular hole nozzle component 2 as the center. At least one of the nozzle plate upper cover 1 and the nozzle plate lower cover 3 is provided with a communicating air inlet 32 so that gas can enter through the air inlet 32; the nozzle plate annular hole nozzle component 2 is provided with multiple sets of Laval nozzles 23 along the circumferential direction. , each Laval nozzle 23 penetrates to the upper and lower surfaces of the nozzle plate ring hole nozzle component 2. After the nozzle plate annular hole nozzle component 2 is installed between the nozzle disc upper cover 1 and the nozzle disc lower cover 3, the entrance and exit of the contraction section of all the Laval nozzles 23 that penetrate to the upper surface of the nozzle disc annular hole nozzle component 2 and The airflow buffer channel 4 is connected, and the outlet of the expansion section that penetrates to the lower surface of the nozzle plate annular hole nozzle component 2 extends to the lower surface of the nozzle plate lower cover 3 . After the assembly of the spray plate upper cover 1, the spray plate annular hole nozzle component 2 and the spray plate lower cover 3 is completed, the gas enters from the air inlet 32, is buffered and distributed through the air flow buffer channel 4, and flows evenly to each laval The converging section of the nozzle 23 then flows through the throat and gradually expanding section of the Laval nozzle 23 and then flows out, so that the airflow can be fully accelerated.

In the above embodiment, the Laval ring hole nozzle plate is arranged separately to facilitate the overall assembly after separate processing. In this way, the flow channel of the Laval nozzle 23, especially the connection part of the Laval nozzle 23 and the air flow buffer flow channel 4, is no longer hidden inside the Laval annular hole nozzle plate, which facilitates the control of the gas flow after each component is processed and formed. The inner surface of the channel is first processed and then assembled together to improve the smoothness of the gas flow channel; with the help of 3D printing technology, the printing and molding of the nozzle plate annular hole nozzle component 2 with a small-size flow channel (Laval nozzle 23) is realized to solve the problem of Laval nozzle 23. The problem of machining the Val ring hole nozzle disk; for the nozzle disk upper cover 1 and the nozzle disk lower cover 3 which are used to clamp and fix the nozzle disk ring hole nozzle component 2 and have a large hollow/annular structure, machining can be used Molding significantly reduces the volume and quality of 3D printed parts, reducing the use of printing materials, thereby effectively reducing processing costs.

In a specific embodiment provided by this application, in order to facilitate the installation of the nozzle plate ring hole nozzle component 2 between the nozzle plate upper cover 1 and the nozzle plate lower cover 3, further refer to Figures 3 and 7. The disk upper cover 1 adopts a circular cover plate and is formed by processing. A first connection hole 11 is opened at the center/axis center of the spray disk upper cover 1, and the first connection hole 11 is used to match the top of the spray disk annular hole nozzle component 2 To achieve a sealed connection between the two, the first connection hole 11 can be a through hole or a blind hole as needed. The lower cover 3 of the spray plate adopts a circular cover plate and is formed by machining. By opening a second connection hole 31 at the center/axis center of the lower cover 3 of the spray plate, with the help of the second connection hole 31 and the nozzle component of the ring hole of the spray plate The bottom of 2 cooperates to achieve a sealed connection between the two, and the second connection hole 31 is a through hole so that the expansion section of the Laval nozzle 23 extends and penetrates to the lower surface of the lower cover 3 of the nozzle plate. It can be understood that the connection between the nozzle plate upper cover 1 and the nozzle plate annular hole nozzle component 2 is not limited to the matching connection of the first connection hole 11. An inner groove can also be provided on the top of the nozzle plate upper cover 1. The top of the annular hole nozzle component 2 is placed in the inner groove of the nozzle plate upper cover 1, and it is only necessary to ensure that the top outer periphery of the nozzle disc annular nozzle component 2 and the nozzle disc upper cover 1 are connected and sealed.

It should be noted that the above embodiments and drawings only use a second hollow portion on the upper surface of the nozzle plate lower cover 3, and the lower surface of the nozzle plate upper cover 1 is flat, and the second hollow portion cooperates with the nozzle plate upper cover 1. The lower surface and the nozzle plate annular hole nozzle component 2 form an annular air flow buffer channel 4 as an example for explanation; corresponding to this situation, the air inlet 32 is opened in the nozzle plate lower cover 3 along the radial direction of the nozzle plate lower cover 3 above, and the air inlet hole 32 penetrates to the second hollow part.

In specific implementation, a first hollow portion can also be provided on the lower surface of the spray plate upper cover 1, and the upper surface of the spray plate lower cover 3 is flat, and the first hollow portion cooperates with the upper surface of the spray plate lower cover 3 and the spray disc ring. The orifice nozzle component 2 forms an annular airflow buffer channel 4; in this case, the air inlet 32 is opened on the nozzle disk upper cover 1 along the radial direction of the nozzle disk upper cover 1, and the nozzle hole penetrates into the first hollow department.

In addition, a first hollow portion can also be provided on the lower surface of the nozzle plate upper cover 1, and a second hollow portion can be provided on the upper surface of the nozzle plate lower cover 3. The shapes and sizes of the first hollow portion and the second hollow portion usually require Correspondingly, the first hollow part cooperates with the second hollow part and the nozzle plate annular hole nozzle component 2 to form an annular airflow buffer flow channel 4; in this case, the air inlet 32 can be opened in the nozzle plate radially as needed. When opening the upper cover 1 or the lower cover 3 of the nozzle plate, it is enough to keep the air inlet 32 penetrating to the first hollow part. When opening the lower cover 3 of the nozzle plate, keep the air inlet 32 penetrating to the second hollow part. Just do it.

Referring to Figure 1, Figure 2 and Figure 6, on the basis of the above embodiments, in order to improve the connection sealing between the upper cover 1 of the spray plate and the nozzle component 2 of the annular hole of the spray plate, the embodiment of the present application has a A first annular groove 21 is provided on the top periphery of the annular nozzle component 2, and a first sealing ring 6 is provided in the first annular groove 21; multiple first annular grooves 21 can be provided as needed, and the number of the first sealing rings 6 is the same as that of the first annular groove 21. The first annular grooves 21 only need to correspond one to one.

In order to improve the connection sealing performance between the nozzle plate lower cover 3 and the nozzle plate annular hole nozzle component 2, the embodiment of the present application has a second annular groove 25 on the bottom periphery of the nozzle disc annular hole nozzle component 2. A second sealing ring 7 is provided in the groove 25; multiple second annular grooves 25 can be provided as needed, and the number of the second sealing rings 7 can be kept in one-to-one correspondence with the second annular groove 25.

When assembling, it is necessary to first place the first sealing ring 6 in the first annular groove 21 on the top of the nozzle part 2 of the nozzle plate annular hole in a one-to-one correspondence, and place the second sealing ring 7 in a one-to-one correspondence in the spray plate. into the second annular groove 25 at the bottom of the annular hole nozzle component 2, and then connect the top of the nozzle disc annular nozzle component 2 with the first connection hole 11 of the nozzle disc upper cover 1, and connect the nozzle disc annular nozzle component The bottom of 2 is connected with the second connection hole 31 of the lower cover 3 of the spray plate.

In order to improve the convenience and reliability of connection, the nozzle part 2 of the nozzle plate annular hole and the upper cover 1 of the nozzle plate are preferably threaded and connected, and the nozzle part 2 and the lower cover 3 of the nozzle plate are also connected by threads.

The specific structure is set as follows: the first connection hole 11 of the upper cover 1 of the spray plate is set as a stepped hole. The hole section of the stepped hole close to the upper surface has a smaller aperture, and the hole section close to the lower surface has a larger aperture. The top structure of the pipe component 2 is adapted to the stepped hole, that is, the top of the nozzle component 2 has a shoulder structure. A first external thread 22 is provided on the outer periphery of the top body of the nozzle plate annular hole nozzle component 2, a first annular groove 21 is provided on the periphery of the shoulder structure, and the first connecting hole 11 is close to the aperture on the lower surface of the nozzle plate upper cover 1 A first threaded connection section 111 adapted to the first external thread 22 is provided on the inner periphery of the larger hole section.

The second connecting hole 31 of the lower cover 3 of the spray plate is also set as a stepped hole. The hole section of the stepped hole close to the upper surface has a larger aperture, and the hole section close to the lower surface has a smaller aperture. The bottom structure is adapted to the stepped hole, that is, the bottom of the nozzle plate annular hole nozzle component 2 also has a shoulder structure. A second external thread 24 is provided on the outer periphery of the bottom main part of the nozzle plate annular hole nozzle component 2, a second annular groove 25 is provided on the periphery of the shoulder structure, and the second connection hole 31 is close to the aperture on the upper surface of the nozzle plate lower cover 3 A second threaded connection section 311 adapted to the second external thread 24 is provided on the inner periphery of the larger hole section.

It can be understood that the threaded connection is only a preferred implementation form for connecting the nozzle plate upper cover 1 and the nozzle plate annular hole nozzle component 2, and the nozzle disc lower cover 3 and the nozzle disc annular hole nozzle component 2. The specific implementation does not Limited to this, a plug-in connection form such as a moderate interference fit can also be used, which will not be described again here.

After the spray plate upper cover 1 and the spray plate lower cover 3 are respectively connected to the upper and lower ends of the spray plate annular hole nozzle component 2, the lower surface of the spray plate upper cover 1 and the upper surface of the spray plate lower cover 3 fit together and cooperate at the same time. The outer periphery of the nozzle plate annular hole nozzle component 2 forms an annular airflow buffer flow channel 4. In order to prevent the airflow from flowing out of the air buffer flow channel 4 along the joint surface of the nozzle plate upper cover 1 and the nozzle plate lower cover 3 in the radial direction, the embodiment of the present application further places a gap between the nozzle plate upper cover 1 and the nozzle plate lower cover 3 A matching sealing structure is provided on the outer periphery of the airflow buffer channel 4, specifically including opening a third annular groove 5 on at least one of the lower surface of the spray plate upper cover 1 and the upper surface of the spray plate lower cover 3. and a third sealing ring 8 disposed in the third annular groove 5 . Multiple sets of the third annular groove 5 and the third sealing ring 8 can be provided in one-to-one correspondence according to requirements.

In addition, the matching sealing structure is not limited to the form of the third annular groove 5 and the third sealing ring 8. It can also be a labyrinth type provided between the lower surface of the nozzle plate upper cover 1 and the upper surface of the nozzle plate lower cover 3. Sealing structure or toothed sealing structure.

In order to further improve the connection reliability between the nozzle plate upper cover 1 and the nozzle plate lower cover 3, multiple sets of fastening holes 9 are opened along the circumferential direction on the outer periphery of the nozzle plate upper cover 1. The fastening holes of the nozzle plate lower cover 3 are 9 are arranged in one-to-one correspondence with the fastening holes 9 of the spray plate upper cover 1. When the spray plate upper cover 1 and the spray plate lower cover 3 are rotated to align with the fastening holes 9, the lower surface of the spray plate upper cover 1 and the spray plate The upper surface of the lower cover 3 is in close contact with each other. At this time, the fasteners are inserted into the fastening holes 9 to connect and fix the spray plate upper cover 1 and the spray plate lower cover 3. The fastening hole 9 penetrates at least one of the nozzle plate upper cover 1 and the nozzle plate lower cover 3 , and the fastening hole 9 should be opened to avoid the air inlet hole 32 . The fasteners are bolts, and the fastening holes 9 are correspondingly threaded holes.

In the above embodiment, the air inlet holes 32 are usually provided in two groups, and are opened at 180° intervals to ensure uniformity of air intake. The nozzle plate annular hole nozzle component 2 mainly includes 8-20 individual Laval nozzles 23. The Laval nozzles 23 are symmetrically distributed, and the included angle of each pair of Laval coils is 45°-50°, that is, the Laval nozzle The axis of the tube 23 is 22.5°-25° with the axis of the nozzle ring hole nozzle component 2; the Laval nozzle 23 shrinks first and then expands. The diameter of the inlet of the contraction section is 4-6mm, and the diameter of the throat is 1-2mm. Section outlet diameter is 2-4mm. The Laval nozzle 23 used in the embodiment of this application has an inlet diameter of 4 mm, a throat diameter of 1 mm, an outlet diameter of 2 mm, a contraction section length of 8 mm, and an expansion section length of 10 mm, which can stably accelerate the airflow to supersonic speeds. For different airflow acceleration requirements, the nozzle annular hole nozzle component 2 of different specifications, that is, providing different numbers and sizes of Laval nozzles 23, can be replaced as needed.

The embodiment of the present application also provides a method for processing the Laval ring hole nozzle disk, which is applied to the processing and production of the Laval ring hole nozzle disk in the above embodiment. Refer to Figure 8, which mainly includes the following steps:

Step S10: Process the nozzle disk upper cover 1 and the nozzle disk lower cover 3 respectively, 3D print and initially generate the nozzle disk annular hole nozzle component 2;

Step S20: Machine the initially generated nozzle disk annular hole nozzle component 2 to complete the assembly surface;

Step S30: Sealingly connect the top of the nozzle plate annular hole nozzle component 2 to the nozzle disc upper cover 1, sealingly connect the bottom of the nozzle disc annular hole nozzle component 2 to the nozzle disc lower cover 3, and keep The lower surface of the nozzle plate upper cover 1 and the upper surface of the nozzle plate lower cover 3 are sealed and fixedly connected.

Among them, step S10 specifically uses machining to process the nozzle plate upper cover 1 and the nozzle plate lower cover 3, thereby reducing the processing cost. The processing process includes selecting disk parts as the processing plates for the nozzle plate upper cover 1 and the nozzle plate lower cover 3. , a first connection hole 11 is opened in the upper cover 1 of the spray plate, and the first connection hole 11 is tapped to form a first threaded connection section 111; a second connection hole 31 is opened in the lower cover 3 of the spray plate, and the second connection hole 31 is tapped. The second threaded connection section 311 is formed; at the same time, corresponding fastening holes 9 are opened in the nozzle plate upper cover 1 and the nozzle plate lower cover 3; a matching seal is processed on the lower surface of the nozzle plate upper cover 1 and the upper surface of the nozzle plate lower cover 3 structure; a hollow structure is provided on the lower surface of the nozzle plate upper cover 1 or the upper surface of the nozzle plate lower cover 3 so as to form an annular airflow buffer channel 4 after assembly; and an air inlet 32 is provided that communicates with the hollow structure; wherein, the hollow structure The structure is located on the inner periphery of the mating sealing structure.

The steps for printing and generating the nozzle disc annular hole nozzle component 2 in step S10 are: convert the three-dimensional drawing of the nozzle disc annular hole nozzle component 2 into STL format and import it into Magics software, select the EOS M290 device from the 3D printing machine library, and print the part The bottom surface is chamfered 2mm and placed on the equipment platform. Import the sliced data of the arranged parts into the EOS M290 device, and select the 316L printing process parameter package. Install the 316L stainless steel substrate for 3D printing into the equipment, install a stainless steel scraper, level the substrate with a feeler gauge, and keep the gap between the scraper and the substrate ≤ 0.02mm. Take 40kg of 316L powder with a size of 15-53μm and put it into the feeding chamber. Raise the feeding chamber to a suitable height. Use a translation scraper to scrape the upper surface of the feeding chamber higher than the base plate powder into the collection chamber. At the same time, a layer of powder is evenly spread on the surface of the base plate. After closing the door, start the device and start printing.

After printing, the substrate and parts are taken out together, the surface powder is cleaned, and the substrate and parts are separated by wire cutting. Use sandblasting process to clean the inside of the nozzle of the part with powder. The preliminarily generated nozzle disc annular hole nozzle component 2 after processing is shown in Figures 4 and 5. It only includes multiple sets of Laval nozzles 23. The top and bottom of the initially generated nozzle disc annular hole nozzle component 2 are regular. And the hollow columnar bodies with different diameters are respectively defined here as the first columnar body and the second columnar body. They are coaxially formed. The first columnar body, that is, the hollow columnar body at the top is smaller in size, and the second columnar body is smaller in size. The size is larger, the Laval nozzle 23 is formed in the second columnar body, and the inlet of the contraction section all penetrates to the upper surface of the second columnar body, and is evenly distributed around the periphery of the first columnar body; at this time, the nozzle disk ring The hole nozzle component 2 does not yet meet the assembly requirements with the nozzle plate upper cover 1 and the nozzle plate lower cover 3. The advantage of such an arrangement is that it can significantly reduce the difficulty of 3D printing and improve the molding rate.

Step S20 is to process the initially generated nozzle disk annular hole nozzle component 2 to form an assembly surface, which specifically includes opening a first annular groove 21 on the top periphery of the nozzle disk annular hole nozzle component 2, that is, the top periphery of the first columnar body, and inserting the first annular groove 21 therein. The wire forms the first external thread 22; a second annular groove 25 is opened at the bottom of the nozzle component 2 of the nozzle disk annular hole, that is, the bottom periphery of the second columnar body, and the wire is threaded to form the second external thread 24. The machined nozzle disk Ring hole nozzle component 2 is shown in Figure 6.

Step S30 specifically includes placing the first sealing ring 6 in the first annular groove 21 at the top of the nozzle plate annular hole nozzle component 2, and placing the second sealing ring 7 in the second annular groove 21 at the bottom of the nozzle disc annular hole nozzle component 2. In the groove 25, place the third sealing ring 8 in the first annular groove 21; then according to the first external thread 22 on the top of the nozzle component 2 of the nozzle plate annular hole corresponding to the first threaded connection section 111 of the first connection hole 11, The second external thread 24 at the bottom of the nozzle plate annular hole nozzle component 2 is tightened corresponding to the second threaded connection section 311 of the second connection hole 31, and when the fastening holes 9 of the nozzle plate upper cover 1 and the nozzle plate lower cover 3 are aligned Finally, insert the fasteners and tighten them in place to achieve a sealed connection between the nozzle plate upper cover 1, the nozzle plate annular hole nozzle component 2 and the nozzle plate lower cover 3.

It is to be understood that the terminology used herein is for the purpose of describing particular example embodiments only and is not intended to be limiting. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly dictates otherwise. The terms "comprises", "includes", "contains" and "having" are inclusive and thus indicate the presence of stated features, steps, operations, elements and/or parts but do not exclude the presence or addition of one or Various other features, steps, operations, elements, components, and/or combinations thereof. The method steps, processes, and operations described herein are not to be construed as requiring that they be performed in the particular order described or illustrated, unless an order of performance is expressly indicated. It should also be understood that additional or alternative steps may be used.

Although the terms first, second, third, etc. may be used herein to describe various elements, components, regions, layers and/or sections, these elements, components, regions, layers and/or sections shall not be referred to as restricted by these terms. These terms are only used to distinguish one element, component, region, layer or section from another region, layer or section. Terms such as "first," "second," and other numerical terms when used herein do not imply a sequence or order unless clearly indicated by the context. Thus, a first element, component, region, layer or section discussed below could be termed a second element, component, region, layer or section without departing from the teachings of the example embodiments.

The above descriptions are only specific embodiments of the present invention, enabling those skilled in the art to understand or implement the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be practiced in other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features claimed herein.

Claims (10)

1. A Laval ring-hole nozzle plate, characterized in that it includes a nozzle plate upper cover, a nozzle plate lower cover, and a nozzle plate ring-hole nozzle assembled between the nozzle plate upper cover and the nozzle plate lower cover. components; the nozzle plate annular hole nozzle component is provided with multiple groups of Laval nozzles along the circumferential direction, and any of the Laval nozzles penetrates the upper and lower surfaces of the nozzle disc annular hole nozzle component; the nozzle disc upper cover It is sealingly fitted to the lower cover of the spray plate and forms an annular air flow buffer channel between them. One of the upper cover of the spray plate and the lower cover of the spray plate is provided with an air inlet hole. The buffer flow channel communicates with the air inlet and the contraction sections of all the Laval nozzles, and the expansion sections of all the Laval nozzles penetrate to the lower surface of the lower cover of the spray plate. 2. The Laval annular hole spray plate according to claim 1, characterized in that a first connection hole is opened at the axis of the upper cover of the spray plate, and the top of the annular hole nozzle component of the spray plate is sealingly connected to A second connection hole is provided in the inner wall of the first connection hole and at the axis of the lower cover of the spray plate, and the bottom of the nozzle component of the annular hole of the spray plate is sealingly connected to the inner wall of the second connection hole. 3. The Laval annular hole spray plate according to claim 1, characterized in that a first hollow portion is opened on the lower surface of the upper cover of the spray plate, and the air inlet hole is along the radial direction of the upper cover of the spray plate. Open, the first hollow portion fits the upper surface of the lower cover of the spray plate to form the air flow buffer channel; Or, a second hollow portion is provided on the upper surface of the lower cover of the spray plate, the air inlet hole is opened in the radial direction of the lower cover of the spray plate, and the second hollow portion fits the lower surface of the upper cover of the spray plate. The surface forms the airflow buffer channel; Or, a first hollow portion is provided on the lower surface of the upper cover of the spray plate, and a second hollow portion is provided on the upper surface of the lower cover of the spray plate. The first hollow portion and the second hollow portion cooperate to form the air flow. Buffer flow channel. 4. The Laval annular hole spray plate according to claim 1, characterized in that a first annular groove is opened on the top periphery of the upper cover of the spray plate, and a first sealing ring is provided in the first annular groove; and/ Or, a second annular groove is provided on the bottom periphery of the lower cover of the spray plate, and a second sealing ring is provided in the second annular groove. 5. The Laval annular hole spray plate according to claim 2, characterized in that a first external thread is provided on the top periphery of the annular hole nozzle component of the spray plate, and the inner wall of the first connecting hole is connected to the A first threaded connection section adapted to the first external thread; and/or a second external thread is provided on the bottom periphery of the nozzle component of the nozzle plate annular hole, and the inner wall of the second connection hole is connected with the second external thread. Second threaded connection section for threaded adaptation. 6. The Laval annular hole spray plate according to any one of claims 1 to 5, characterized in that a matching sealing structure is provided between the lower surface of the upper cover of the spray plate and the upper surface of the lower cover of the spray plate, The matching sealing structure is provided on the outer periphery of the air flow buffer channel. 7. The Laval ring hole spray plate according to claim 1, characterized in that the Laval ring hole spray plate satisfies at least one of the following: A pair of said air inlet holes are opened at 180° intervals; The Laval nozzle is arranged symmetrically along the circumference of the nozzle component of the nozzle plate annular hole; The axis of any of the Laval nozzles and the axis of the nozzle component of the nozzle disk annular hole form an included angle of 22.5°-25°; The inlet diameter of the contraction section of any Laval nozzle close to the air flow annulus area is 4mm, the diameter of the throat is 1mm, the outlet diameter of the expansion section is 2mm, the length of the contraction section is 8mm, and the length of the expansion section is 10mm; The outer peripheral portions of the nozzle plate upper cover and the nozzle plate lower cover are provided with corresponding fastening holes along the circumferential direction and are connected through fasteners. 8. A method for processing the Laval ring hole nozzle disk, which is applied to the processing and production of the Laval ring hole nozzle disk according to any one of claims 1 to 7, and is characterized in that it includes: Process the nozzle plate upper cover and the nozzle plate lower cover respectively, 3D print and initially generate the nozzle plate annular hole nozzle parts; Carry out machining on the initially generated nozzle plate annular hole nozzle components to complete the assembly surface; The top of the nozzle component of the nozzle plate annular hole is sealingly connected to the upper cover of the nozzle disc, and the bottom of the nozzle component of the annular hole nozzle of the nozzle disc is sealingly connected to the lower cover of the nozzle disc to keep the upper cover of the nozzle disc The lower surface and the upper surface of the lower cover of the spray plate are sealingly fitted and fixedly connected thereto. 9. The Laval annular hole nozzle disc processing method according to claim 8, characterized in that the step of machining the nozzle disc annular hole nozzle component to complete the assembly surface includes: A second annular groove is provided on the bottom periphery of the nozzle component of the nozzle disk annular hole, and a first annular groove is provided on the top periphery of the nozzle component of the nozzle disk annular hole; The step of sealing the top of the nozzle component of the nozzle plate annular hole to the upper cover of the nozzle disc, and sealing the bottom of the nozzle component of the nozzle disc annular hole to the lower cover of the nozzle disc includes: Install a first sealing ring in the first annular groove, and install the top of the nozzle component of the nozzle plate annular hole to the center of the bottom of the upper cover of the nozzle plate; A second sealing ring is installed in the second annular groove, and the bottom of the nozzle component of the nozzle plate annular hole is installed to the center of the bottom of the lower cover of the nozzle plate. 10. The Laval ring hole nozzle disc processing method according to claim 8, characterized in that the step of processing the nozzle disc upper cover and the nozzle disc lower cover respectively is: The upper cover and the lower cover of the spray disc are machined and formed, and a third annular groove is opened on the lower surface of the upper cover of the spray disc and/or the upper surface of the lower cover of the spray disc; A fastening hole is provided in the upper cover of the spray plate and the lower cover of the spray plate, and the fastening hole penetrates at least one of the upper cover of the spray plate and the lower cover of the spray plate; The step of maintaining the lower surface of the upper cover of the spray plate and the upper surface of the lower cover of the spray plate in a sealing fit and fixing the two is: Set a third sealing ring in the third annular groove, fit the upper cover of the spray plate and the lower cover of the spray plate and keep the fastening holes of the two in alignment, and install the fastener into the Fastening holes.