Cooling spray pipe with replaceable throat part

Abstract

The utility model discloses a cooling spray pipe with a replaceable throat part. The cooling spray pipe comprises a spray pipe contraction section, the spray pipe throat part and a spray pipe expansion section, the nozzle contraction section is provided with a contraction channel, the nozzle throat is provided with a throat channel, and the nozzle expansion section is provided with an expansion channel; a sinking groove is formed in the position, corresponding to the periphery of an outlet of the contraction channel, of the first end of the spray pipe contraction section, the spray pipe throat is embedded into the sinking groove, and the spray pipe expansion section is detachably connected to the first end of the spray pipe contraction section and presses the spray pipe throat. The contraction channel, the throat channel and the expansion channel are sequentially and coaxially communicated, and communicated cooling channels are arranged in the spray pipe contraction section, the spray pipe throat and the spray pipe expansion section. The cooling spray pipe is applied to the technical field of aerospace, the cooling spray pipe can be installed and fixed under the condition that the structure and operation are both simple, the spray pipe throat can be replaced, and the cooling spray pipe is convenient to install and maintain, low in cost, high in efficiency and capable of effectively meeting the requirements for large-range variable thrust and wide thermal protection.

Description

Technical Field

[0001] The utility model relates to the technical field of aerospace, in particular to a cooling nozzle with a replaceable throat. Background Art

[0002] Converging-diverging nozzles play a crucial role in aircraft and rocket engines, primarily for thrust regulation and vector control. The high-temperature gases generated within the engine's combustion chamber must be accelerated and discharged through the nozzle to achieve effective thrust output. In wind tunnel testing, the nozzle, as a core component, must accelerate subsonic airflow to supersonic speeds and ensure uniform, constant Mach number airflow at the exit.

[0003] Because the nozzle throat bears the highest heat flux density, multiple factors such as strength, rigidity, and cooling must be comprehensively considered during its design and manufacturing process. Conventional nozzles are usually cooled externally or by welding an additional shell to the outer wall of the nozzle, and cooling water is passed into the cavity between the shell and the outer wall of the nozzle. The channels of this cooling method must be determined in advance during the design phase and can usually only meet the thermal protection requirements under specific operating conditions. However, faced with the increasingly complex large-scale variable thrust and extensive thermal protection requirements, the design of traditional nozzles has gradually revealed its limitations and is being replaced by more advanced technical solutions. Utility Model Content

[0004] In response to the above-mentioned deficiencies in the existing technology, the utility model provides a cooling nozzle with a replaceable throat, which has the characteristics of easy disassembly, good sealing, and cost saving, and can effectively meet the needs of a wide range of variable thrust and extensive thermal protection.

[0005] To achieve the above-mentioned purpose, the utility model provides a cooling nozzle with a replaceable throat, comprising a nozzle contraction section, a nozzle throat section, and a nozzle expansion section;

[0006] The nozzle convergence section has a convergence channel axially penetrating the nozzle convergence section, the nozzle throat has a throat channel axially penetrating the nozzle throat, and the nozzle divergence section has an divergence channel axially penetrating the nozzle divergence section;

[0007] A recessed groove is provided at the first end of the nozzle convergence section and at a position corresponding to the periphery of the convergence channel outlet, the nozzle throat is embedded in the recessed groove, and the nozzle expansion section is detachably connected to the first end of the nozzle convergence section and presses the nozzle throat tightly;

[0008] The contraction channel, the throat channel, and the expansion channel are coaxially connected in sequence, and the nozzle contraction section, the nozzle throat, and the nozzle expansion section have connected cooling channels.

[0009] In one embodiment, the cooling channel includes a first flow channel, a second flow channel and a third flow channel;

[0010] The first flow channel is provided on the nozzle expansion section, the first end of the first flow channel is located at the side of the nozzle expansion section, and the second end of the first flow channel is located at the end of the nozzle expansion section;

[0011] The second flow channel is provided on the nozzle throat, the first end and the second end of the first flow channel are both located on the side of the nozzle throat, and an annular gap is formed between the second end of the nozzle throat and the side wall of the trough, and the second end of the first flow channel, the annular gap, and the first end of the second flow channel are sequentially connected;

[0012] The third flow channel is arranged on the nozzle contraction section, the first end of the third flow channel is located on the side wall of the trough, the second end of the third flow channel is located at the first end of the nozzle contraction section, and the first end of the third flow channel is connected to the second end of the second flow channel.

[0013] In one embodiment, a liquid collecting chamber is provided on the third flow channel.

[0014] In one embodiment, a first sealing ring and a second sealing ring are provided between the side of the nozzle throat and the side wall of the trough;

[0015] The first sealing ring is located between the first end of the nozzle throat and the second end of the second flow channel, and the second sealing ring is located between the first end and the second end of the second flow channel.

[0016] In one embodiment, the cross-sectional area of ​​the second flow channel is smaller than that of the first flow channel and the third flow channel.

[0017] In one embodiment, a third sealing ring is provided between the second end of the nozzle throat and the end of the nozzle expansion section.

[0018] In one embodiment, a fourth sealing ring is provided between the first end of the nozzle convergence section and the end of the nozzle divergence section.

[0019] In one embodiment, a locating pin is provided at the bottom of the sink, and a locating pin hole is provided at the first end of the throat of the nozzle;

[0020] After the nozzle throat is embedded in the sink, the positioning pin is embedded in the positioning pin hole.

[0021] In one embodiment, a plurality of threaded holes are provided at the first end of the nozzle convergence section and at positions corresponding to the periphery of the sink;

[0022] The nozzle contraction section and the nozzle expansion section are detachably connected via the threaded hole and the screw.

[0023] In one embodiment, an assembly structure is provided on the nozzle convergence section for fixing the nozzle convergence section to an external structural component.

[0024] Compared with the prior art, the present invention has the following beneficial technical effects:

[0025] 1. This utility model provides a groove on the nozzle's convergent section, inserts the nozzle throat into the groove, and then uses the nozzle's divergent section to compress it. This allows for the installation and fixation of the cooling nozzle with simple structure and operation. The nozzle throat can be replaced, making installation and maintenance easy, cost-effective, and highly efficient. It can effectively meet the needs of a wide range of variable thrust and extensive thermal protection.

[0026] 2. In the preferred embodiment of the present invention, positioning pins and positioning pin holes are provided to reasonably align the various flow channels in the cooling channel, and a sealing ring is provided to ensure reliable sealing of the cooling nozzle. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0028] Figure 1 This is a cross-sectional view of a cooling nozzle in an embodiment of the present utility model;

[0029] Figure 2 This is a sectional isometric view of the nozzle contraction section in an embodiment of the present utility model;

[0030] Figure 3 This is a sectional isometric view of the nozzle throat in an embodiment of the present invention;

[0031] Figure 4 It is a sectional isometric view of the nozzle expansion section in an embodiment of the present utility model.

[0032] Figure numbers: nozzle contraction section 1, contraction channel 101, sink 102, third flow channel 103, liquid collecting chamber 104, fourth sealing ring groove 105, positioning pin 106, threaded hole 107, assembly hole 108, nozzle throat 2, throat channel 201, second flow channel 202, first sealing ring groove 203, second sealing groove 204, third sealing ring groove 205, positioning pin hole 206, nozzle expansion section 3, expansion channel 301, first flow channel 302, first sealing ring 4, second sealing ring 5, third sealing ring 6, fourth sealing ring 7.

[0033] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0034] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present invention are only used to explain the relative position relationship, movement status, etc. between the various components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0036] In addition, the terms "first," "second," and so on, used in this utility model are for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of this utility model, "plurality" means at least two, such as two, three, etc., unless otherwise specifically defined.

[0037] In this utility model, unless otherwise specified or limited, the terms "connection" and "fixation" should be understood in a broad sense. For example, "fixation" can mean fixed connection, detachable connection, or integration; it can mean mechanical connection, electrical connection, physical connection, or wireless communication connection; it can mean direct connection or indirect connection through an intermediate medium; it can mean internal communication between two elements or interaction between two elements, unless otherwise specified. For those skilled in the art, the specific meanings of the above terms in this utility model can be understood according to specific circumstances.

[0038] In addition, the technical solutions between the various embodiments of the present invention can be combined with each other, but it must be based on the fact that ordinary technicians in this field can implement it. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by this utility model.

[0039] like Figures 1 to 4The figure shows a cooling nozzle with a replaceable throat (hereinafter referred to as the "cooling nozzle") disclosed in this embodiment. The nozzle primarily comprises a converging section 1, a nozzle throat 2, and a diverging section 3. The converging section 1, the nozzle throat 2, and the diverging section 3 are all integrally formed as a body of revolution. The converging section 1 has a converging channel 101 extending axially through the nozzle converging section 1. The inlet of the converging channel 101 is located at the second end of the nozzle converging section 1, and the outlet of the converging channel 101 is located at the first end of the nozzle converging section 1. The throat 2 has a throat channel 201 extending axially through the nozzle throat 2. The inlet of the throat channel 201 is located at the first end of the nozzle throat 2, and the outlet of the throat channel 201 is located at the second end of the nozzle throat 2. The diverging section 3 has an diverging channel 301 extending axially through the nozzle diverging section 3. The inlet of the diverging channel 301 is located at the first end of the nozzle diverging section 3, and the outlet of the diverging channel 301 is located at the second end of the nozzle diverging section 3.

[0040] A recessed groove 102 is provided at the first end of the nozzle's converging section 1, corresponding to a position around the outlet of the converging channel 101. The sidewall configuration of the recessed groove 102 matches the side configuration of the nozzle throat 2. The nozzle throat 2 is embedded in the recessed groove 102, with the first end of the nozzle throat 2 abutting the bottom of the recessed groove 102. The nozzle's diverging section 3 is detachably connected to the first end of the nozzle's converging section 1 and compresses the second end of the nozzle throat 2. The converging channel 101, throat channel 201, and diverging channel 301 are coaxially connected in sequence, and cooling channels are interconnected within the nozzle's converging section 1, nozzle throat 2, and nozzle diverging section 3. By opening a groove 102 on the nozzle convergence section 1, and inserting the nozzle throat 2 into the groove 102 and then pressing it with the nozzle expansion section 3, the installation and fixation of the cooling nozzle can be achieved under the conditions of simple structure and operation. The nozzle throat 2 can be replaced, and its installation and maintenance are convenient, low-cost, and highly efficient, and can effectively meet the needs of a wide range of variable thrust and extensive thermal protection.

[0041] In this embodiment, the cooling channel includes a first flow channel 302, a second flow channel 202, and a third flow channel 103. The first flow channel 302 is provided on the nozzle expansion section 3, with the first end of the first flow channel 302 located on the side of the nozzle expansion section 3, and the second end of the first flow channel 302 located on the first end of the nozzle expansion section 3. The second flow channel 202 is provided on the nozzle throat 2, with the first and second ends of the first flow channel 302 both located on the side of the nozzle throat 2, and an annular gap formed between the second end of the nozzle throat 2 and the sidewall of the trough 102. The second end of the first flow channel 302, the annular gap, and the first end of the second flow channel 202 are sequentially connected. The third flow channel 103 is provided on the nozzle convergence section 1, with the first end of the third flow channel 103 located on the sidewall of the trough 102, the second end of the third flow channel 103 located on the first end of the nozzle convergence section 1, and the first end of the third flow channel 103 connected to the second end of the second flow channel 202. The coolant flows into the cooling nozzle from the first end of the first flow channel 302 and then flows out from the second end of the third flow channel 103. Figure 1 In a specific application, pipes can be installed on the first end of the first flow channel 302 and the second end of the third flow channel 103 by welding, and a pneumatic stop valve is arranged on the pipe to control the flow and stop of the coolant.

[0042] It is worth noting that in specific applications, the first end and the second end of the second flow channel 202 can also be directly set at the two ends of the nozzle throat 2 respectively, and it is only necessary to ensure that the first flow channel 302, the second flow channel 202 and the third flow channel 103 are connected in sequence.

[0043] In a specific implementation, the flow channel configurations of the first flow channel 302, the second flow channel 202, and the third flow channel 103 can be straight channels, spiral channels, etc. The cross-sectional shapes of the first flow channel 302, the second flow channel 202, and the third flow channel 103 can be rectangular, square, circular, pentagonal, or other special-shaped structures. The cross-sectional areas of the first flow channel 302, the second flow channel 202, and the third flow channel 103 can be the same or different, and the cross-sectional areas at different locations on the first flow channel 302, the second flow channel 202, and the third flow channel 103 can be the same or different. Preferably, the cross-sectional area of ​​the second flow channel 202 is smaller than the cross-sectional areas of the first flow channel 302 and the third flow channel 103, so as to increase the flow velocity of the coolant at the nozzle throat 2, thereby increasing the heat exchange amount and better protecting the nozzle throat 2.

[0044] As a preferred embodiment, a liquid collecting cavity 104 is provided on the third flow channel 103 to stabilize the flow pressure of the coolant in the cooling channel.

[0045] In this embodiment, a first sealing ring 4 and a second sealing ring 5 are provided between the side of the nozzle throat 2 and the sidewall of the sink 102. The first sealing ring 4 is located between the first end of the nozzle throat 2 and the second end of the second flow channel 202, and the second sealing ring 5 is located between the first and second ends of the second flow channel 202. A third sealing ring 6 is provided between the second end of the nozzle throat 2 and the first end of the nozzle diverging section 3, and a fourth sealing ring 7 is provided between the first end of the nozzle convergent section 1 and the first end of the nozzle diverging section 3, to ensure the sealing of the entire cooling nozzle. Specifically, a first sealing ring groove 203 and a second sealing ring groove 204 are provided on the side of the nozzle throat 2, a third sealing ring groove 205 is provided at the second end of the nozzle throat 2, and a fourth sealing ring groove 105 is provided at the first end of the nozzle convergent section 1. During assembly, the first sealing ring 4 is inserted into the first sealing ring groove 203, the second sealing ring 5 is inserted into the second sealing groove 204, the third sealing ring 6 is inserted into the third sealing ring groove 205, and the fourth sealing ring 7 is inserted into the fourth sealing ring groove 105.

[0046] As a preferred embodiment, a locating pin 106 is provided at the bottom of the trough 102, and a locating pin hole 206 is provided at the first end of the nozzle throat 2. When the nozzle throat 2 is inserted into the trough 102, the locating pin 106 engages with the locating pin hole 206, ensuring proper alignment of the flow channels in the cooling channel. It is worth noting that in specific applications, the locating pin 106 can also be placed at the first end of the nozzle throat 2, and the locating pin hole 206 can be placed at the bottom of the trough 102.

[0047] In the specific implementation process, a plurality of threaded holes 107 are provided at the first end of the nozzle convergence section 1 and corresponding to the positions around the sink 102. During assembly, the nozzle expansion section 3 can be detachably connected to the nozzle convergence section 1 by cooperating with the screws through the threaded holes 107.

[0048] During the specific implementation process, an assembly structure is provided on the nozzle convergence section 1, specifically a plurality of assembly holes 108 arranged at the edge of the nozzle convergence section 1, so as to fix the nozzle convergence section 1 to an external structural member through the assembly holes 108 and fasteners such as bolts.

[0049] The assembly process of the cooling nozzle in this embodiment is as follows:

[0050] First, install the first sealing ring 4 and the second sealing ring 5 into the first sealing ring groove 203 and the second sealing groove 204 on the nozzle throat 2 respectively;

[0051] Subsequently, the nozzle throat 2 is installed into the recess 102 on the nozzle convergence section 1, completing the fit between the nozzle throat 2 and the nozzle convergence section 1, so that the first sealing ring 4 and the second sealing ring 5 achieve a sealing effect under radial pressure, wherein the locating pin 106 is kept aligned with the locating pin hole 206, ensuring that the second flow channel 202 on the nozzle throat 2 is aligned with the third flow channel 103 on the nozzle convergence section 1;

[0052] Then, install the third sealing ring 6 and the fourth sealing ring 7 into the third sealing ring groove 205 on the nozzle throat 2 and the fourth sealing ring groove 105 on the nozzle convergence section 1 respectively;

[0053] Then, the nozzle expansion section 3 is used to press the nozzle throat 2, and the nozzle expansion section 3 and the nozzle contraction section 1 are fixedly connected through the screw and the threaded hole 107. At the same time, the pre-tightening force of the thread presses the third sealing ring 6 and the fourth sealing ring 7 to achieve a sealing effect;

[0054] Finally, the nozzle convergence section 1 is fixed to the test section through the screw and the assembly hole 108 .

[0055] The above description is only a preferred embodiment of the present invention and does not limit the patent scope of the present invention. All equivalent structural transformations made by using the contents of the present invention specification and drawings under the utility model concept, or direct / indirect application in other related technical fields are included in the patent protection scope of the present invention.

Claims

1. A cooling nozzle with a replaceable throat, characterized in that: It includes the nozzle convergence section, nozzle throat and nozzle expansion section; The nozzle convergence section has a convergence channel axially penetrating the nozzle convergence section, the nozzle throat has a throat channel axially penetrating the nozzle throat, and the nozzle divergence section has an divergence channel axially penetrating the nozzle divergence section; A recessed groove is provided at the first end of the nozzle convergence section and at a position corresponding to the periphery of the convergence channel outlet, the nozzle throat is embedded in the recessed groove, and the nozzle expansion section is detachably connected to the first end of the nozzle convergence section and presses the nozzle throat tightly; The contraction channel, the throat channel, and the expansion channel are coaxially connected in sequence, and the nozzle contraction section, the nozzle throat, and the nozzle expansion section have connected cooling channels.

2. The cooling nozzle with replaceable throat according to claim 1, characterized in that: The cooling channel includes a first flow channel, a second flow channel and a third flow channel; The first flow channel is provided on the nozzle expansion section, the first end of the first flow channel is located at the side of the nozzle expansion section, and the second end of the first flow channel is located at the end of the nozzle expansion section; The second flow channel is provided on the nozzle throat, the first end and the second end of the first flow channel are both located on the side of the nozzle throat, and an annular gap is formed between the second end of the nozzle throat and the side wall of the trough, and the second end of the first flow channel, the annular gap, and the first end of the second flow channel are sequentially connected; The third flow channel is arranged on the nozzle contraction section, the first end of the third flow channel is located on the side wall of the trough, the second end of the third flow channel is located at the first end of the nozzle contraction section, and the first end of the third flow channel is connected to the second end of the second flow channel.

3. The cooling nozzle with replaceable throat according to claim 2, characterized in that: The third flow channel is provided with a liquid collecting cavity.

4. The cooling nozzle with replaceable throat according to claim 2, characterized in that: A first sealing ring and a second sealing ring are provided between the side of the nozzle throat and the side wall of the trough; The first sealing ring is located between the first end of the nozzle throat and the second end of the second flow channel, and the second sealing ring is located between the first end and the second end of the second flow channel.

5. The cooling nozzle with replaceable throat according to any one of claims 2 to 4, characterized in that: The cross-sectional area of ​​the second flow channel is smaller than that of the first flow channel and the third flow channel.

6. The cooling nozzle with replaceable throat according to any one of claims 1 to 4, characterized in that: A third sealing ring is provided between the second end of the nozzle throat and the end of the nozzle expansion section.

7. The cooling nozzle with replaceable throat according to any one of claims 1 to 4, characterized in that: A fourth sealing ring is provided between the first end of the nozzle contraction section and the end of the nozzle expansion section.

8. The cooling nozzle with replaceable throat according to any one of claims 1 to 4, characterized in that: A positioning pin is provided at the bottom of the sink, and a positioning pin hole is provided at the first end of the throat of the nozzle; After the nozzle throat is embedded in the sink, the positioning pin is embedded in the positioning pin hole.

9. The cooling nozzle with replaceable throat according to any one of claims 1 to 4, characterized in that: A plurality of threaded holes are provided at the first end of the nozzle converging section and at positions corresponding to the periphery of the sink; The nozzle contraction section and the nozzle expansion section are detachably connected via the threaded hole and the screw.

10. The cooling nozzle with replaceable throat according to any one of claims 1 to 4, characterized in that: The nozzle converging section is provided with an assembly structure for fixing the nozzle converging section on an external structural component.

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