Perforated elbow pipe structure of inlet section of locomotive pump and manufacturing method of perforated elbow pipe structure

Abstract

The invention discloses mechanical engineering equipment and aims to provide an inlet section perforated elbow structure of a locomotive pump and a manufacturing method of the inlet section perforated elbow structure. The inlet section perforated elbow structure is good in noise reduction effect, convenient to machine, capable of guaranteeing normal work and long-term use of the whole locomotive pump and small in influence on oil pump performance. According to the technical scheme, an inclined micropore array is arranged on a shell in a staggered mode, an included angle is formed by combining flow guide strips on the inner side of the shell, energy generated when fluid impacts a pipeline can be dispersed, the impact energy of the fluid is weakened, and vortex noise is effectively restrained; according to the locomotive pump shell, the leakage risk caused by inevitable vibration in the operation process of a locomotive pump can be effectively prevented, in addition, the inner wall and the outer wall of the bent part of the shell are thickened, the anti-deformation capacity of the shell can be improved while smooth transition of a flow channel is guaranteed, and the locomotive pump shell is suitable for the technical field of locomotive pump production.

Description

Technical Field

[0001] The present invention relates to mechanical engineering equipment, and more particularly to a perforated elbow structure of an inlet section of a locomotive pump and a manufacturing method thereof. Background Art

[0002] During locomotive operation, the oil pump, a critical power transmission component, generates vibration and noise that not only affects cab comfort but can also cause unnecessary disturbance to the surrounding environment. Traditional approaches to reducing oil pump noise focus on optimizing the overall structure or installing additional mufflers, but these methods are often costly and have limited effectiveness. Therefore, exploring cost-effective and efficient methods to reduce oil pump noise is crucial. Summary of the Invention

[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a locomotive pump inlet section perforated elbow structure and its manufacturing method, which has good noise reduction effect, is easy to process, can ensure the normal operation and long-term use of the locomotive pump as a whole, and has little impact on the performance of the oil pump.

[0004] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a perforated elbow structure for the inlet section of a locomotive pump, comprising a pump body and a fluid domain arranged on one side of the pump body, the fluid domain having an inlet section and an outlet section fixedly connected to the pump body, a curved connecting section being provided between the inlet section and the outlet section, the inlet section of the fluid domain being provided with a perforated elbow, the perforated elbow having a shell matching the inlet section of the fluid domain and micropores arranged on the shell, the perforated elbow being fixedly connected to the inlet section of the fluid domain.

[0005] The present invention is further configured such that the microholes on the perforated elbow are arranged in a staggered manner on the shell, and the axis of each microhole is arranged obliquely relative to the surface of the shell.

[0006] The present invention is further configured as follows: a guide strip extending along the length direction of the shell is provided on the inner side of the shell, and the extending direction of the guide strip forms an angle with the axis of the microhole.

[0007] The present invention is further configured as follows: a fastening flange structure is provided between the perforated elbow and the inlet section of the fluid domain, the fastening flange structure includes connecting protrusions arranged on both sides of the shell and a bolt group arranged on the connecting protrusions, the inner wall of the inlet section is provided with a positioning step, and the connecting protrusion is fixedly connected to the positioning step by the bolt group.

[0008] The present invention is further configured as follows: the inner wall and the outer wall of the curved portion of the shell are thickened, and the ratio of the outer wall of the curved portion to the inner wall of the curved portion is 1.5:1.

[0009] Preferably, the micropores are arranged on the shell along the axial direction of the shell to form a plurality of rows of micropore arrays, and the micropores of adjacent micropore arrays are staggered in the circumferential direction of the shell.

[0010] The present invention is further configured such that: the outlet section is further provided with a diffusion section, and the diameter of the diffusion section gradually expands along the flow direction of the fluid in the fluid domain.

[0011] The present application also discloses a method for manufacturing a perforated elbow structure of an inlet section of a locomotive pump, the manufacturing method comprising the following steps: S1, processing a shell: pressurizing and forming a pipe raw material into an arc of a corresponding shape through a pipe expansion process;

[0012] S2. Micro-hole processing: Staggered micro-holes are formed on the shell surface. At the same time, the processing angle is adjusted during the processing so that the axis of the micro-hole forms a 25° inclined angle with the shell surface;

[0013] S3. Processing guide strips: forming guide strips on the inner surface of the shell, and making the extending direction of the guide strips form an angle of 50° with the inclination direction of the micropores;

[0014] S4. Processing and fastening flange structure: welding connecting protrusions on both ends of the shell and processing bolt holes on the connecting protrusions;

[0015] S5. Install the diffuser: weld the diffuser at the outlet of the fluid domain, and the diameter of the diffuser gradually increases in the direction away from the outlet;

[0016] S6. Overall installation: insert the assembled structure into the fluid domain and fix the shell and the fluid domain with the bolt group through the bolt holes;

[0017] S7. Noise reduction detection: The noise reduction effect of the locomotive pump is detected at the rated flow rate. The maximum noise value is set to 8dB (A) within a range of 1m. At the same time, the noise value within the range of 1m of the current locomotive pump is detected at the rated flow rate. The size of Z is the noise value. If Z ≤ 8dB (A), it is judged that the noise reduction effect of the current locomotive pump is good and the current locomotive pump is qualified. Otherwise, it is judged that the noise reduction effect of the current locomotive pump is poor and the current locomotive pump is unqualified.

[0018] Preferably, the step S8 further includes detecting the connection strength of the locomotive pump, including the following steps: S81, setting the current pressure threshold of the locomotive pump to P, applying pressure to the locomotive pump with a pressure value of 2P, and continuing for a period of time T;

[0019] S82. After the T time period, the pre-tightening force at the fastening flange structure is detected. If the pre-tightening force loss is greater than 10%, it is determined that the current locomotive pump connection strength is poor and the locomotive pump is unqualified. Conversely, if the pre-tightening force loss is less than 10%, it is determined that the current locomotive pump connection strength is good and the locomotive pump is qualified.

[0020] By adopting the above technical solution, the beneficial effects are as follows: 1. The perforated elbow structure of the locomotive pump inlet section of the present application achieves efficient noise reduction effect and structural reliability through the coordinated design of multiple components. Specifically, through the inclined micropore array staggered on the shell and combined with the guide strip on the inner side of the shell to form an angle, the energy of the fluid impacting the pipeline can be dispersed, the impact energy of the fluid is weakened, and the eddy noise is effectively suppressed. At the same time, the perforated elbow and the fluid domain are fixedly connected by a fastening flange structure, which can effectively prevent the risk of leakage caused by inevitable vibration during the operation of the locomotive pump. In addition, the inner and outer walls of the curved part of the shell are thickened, which can increase the deformation resistance of the shell while ensuring a smooth transition of the flow channel. At the same time, a shock-absorbing layer can be provided on the outside of the shell as needed. The shock-absorbing layer can further absorb the vibration generated during the operation of the locomotive pump, thereby forming a full-process noise reduction system for the fluid from the inlet section of the fluid domain to the outlet section of the fluid domain, so that the above-mentioned locomotive pump has the advantages of low noise, high stability and long service life.

[0021] 2. Furthermore, the shell surface is provided with staggered micropores, and the micropores are inclined relative to the shell surface. With the above scheme, the micropores can guide the fluid to release pressure that is not relatively perpendicular to the shell surface through the inclined angle, so that the pressure of the fluid is released along the tangential direction of the shell, avoiding the pressure being perpendicular to the shell surface and emitting large noise, and the micropores are staggered on the shell surface, which can effectively reduce the flow rate of a single hole through the porous diversion effect, and can reduce the noise caused by the excitation of the fluid. The shell is provided with guide strips to cooperate with the micropores, which can further optimize the smooth distribution, and guide the disordered fluid in the fluid domain into a circumferential laminar flow extending along the length direction of the fluid domain through the guide layer, preventing the fluid in the fluid domain from impacting the inner surface of the fluid domain due to the change in flow direction, causing a secondary noise source, and a diffusion section is welded at the outlet section, and the diffusion section reduces the flow rate at the outlet section, further suppressing the noise of the wake flow.

[0022] 3. At the same time, a fastening flange structure is provided between the perforated elbow and the inlet section of the fluid domain. The fastening flange structure includes connecting protrusions arranged on both sides of the shell and a bolt group arranged on the connecting protrusions, so that the shell is rigidly locked with the fluid domain through the positioning step set at the inlet section of the fluid domain, thereby improving the tensile strength of the perforated elbow after installation, and improving the sealing performance between the shell and the fluid domain. In combination with the shock-absorbing layer, the fatigue resistance of the locomotive pump during operation is improved, thereby extending the overall service life of the device.

[0023] 4. Moreover, in the process of processing the locomotive pump of the present application, the processing flow is simple to operate and the processing accuracy is high. In the process of processing, multiple micropores are integrated into multiple rows of micropore arrays arranged along the length direction of the shell. The overall processing difficulty is small, and the guide strips inside the shell are formed by multi-axis linkage milling. The processing accuracy and efficiency are high, and the structural dimensions of each component are highly consistent. At the same time, after manufacturing is completed, the locomotive pump can be tested for noise reduction effect and assembly strength, thereby preventing the occurrence of unqualified products. The product qualification rate is high and the use effect is good. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 A schematic diagram of the specific structure of an embodiment of a perforated elbow structure of an inlet section of a locomotive pump and a manufacturing method thereof according to the present invention;

[0025] Figure 2 A cross-sectional view of an embodiment of a perforated elbow structure of an inlet section of a locomotive pump and a manufacturing method thereof according to the present invention;

[0026] Figure 3 A flowchart of a manufacturing method of an embodiment of a perforated elbow structure of an inlet section of a locomotive pump and a manufacturing method thereof according to the present invention;

[0027] Figure 4 This is a flow chart of connection strength testing for an embodiment of a perforated elbow structure of an inlet section of a locomotive pump and a manufacturing method thereof according to the present invention;

[0028] Reference numerals in the figure: 1. fluid domain; 11. inlet section; 12. outlet section; 13. connecting section; 2. perforated elbow; 21. shell; 22. micropore; 23. guide strip; 3. fastening flange structure; 31. connecting protrusion; 32. bolt group; 33. positioning step. DETAILED DESCRIPTION

[0029] Reference Figures 1 to 4 The invention further describes an embodiment of a perforated elbow pipe at the inlet section of a locomotive pump and a manufacturing method thereof.

[0030] For ease of explanation, spatial relative terms such as "upper", "lower", "left", and "right" are used in the embodiments to illustrate the relationship between one element or feature shown in the figures and another element or feature. It should be understood that, in addition to the orientation shown in the figures, spatial terms are intended to include different orientations of the device in use or operation. For example, if the device in the figure is inverted, the element described as being "under" other elements or features will be positioned "above" other elements or features. Therefore, the exemplary term "under" can include both upper and lower orientations. The device can be positioned in other ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used here can be interpreted accordingly.

[0031] Moreover, relational terms such as “first” and “second” are merely used to distinguish one component from another having the same name, but do not necessarily require or imply any actual relationship or order between these components.

[0032] A perforated elbow structure for the inlet section of a locomotive pump includes a pump body and a fluid domain 1 arranged on one side of the pump body. The fluid domain 1 has an inlet section 11 and an outlet section 12 fixedly connected to the pump body. A curved connecting section 13 is provided between the inlet section 11 and the outlet section 12. The inlet section 11 of the fluid domain 1 is provided with a perforated elbow 2. The perforated elbow 2 has a shell 21 matching the inlet section 11 of the fluid domain 1 and micropores 22 arranged on the shell 21. The perforated elbow 2 is fixedly connected to the inlet section 11 of the fluid domain 1.

[0033] The micropores 22 on the perforated elbow 2 are arranged in a staggered manner on the shell 21 , and the axis of each micropore 22 is arranged to be inclined relative to the surface of the shell 21 .

[0034] A guide bar 23 extending along the length direction of the shell 21 is provided on the inner side of the shell 21 , and the extending direction of the guide bar 23 forms an angle with the axis of the microhole 22 .

[0035] A fastening flange structure 3 is provided between the perforated elbow 2 and the inlet section 11 of the fluid domain 1. The fastening flange structure 3 includes connecting protrusions 31 arranged on both sides of the shell 21 and a bolt group 32 arranged on the connecting protrusion 31. The inner wall of the inlet section 11 is provided with a positioning step 33, and the connecting protrusion 31 is fixedly connected to the positioning step 33 through the bolt group 32.

[0036] The inner wall and outer wall of the curved portion of the shell 21 are thickened, and the ratio of the outer wall of the curved portion to the inner wall of the curved portion is 1.5:1.

[0037] Preferably, the micropores 22 are arranged on the shell 21 along the axial direction of the shell 21 to form a plurality of rows of micropore 22 arrays, and the micropores 22 of adjacent micropore 22 arrays are staggered in the circumferential direction of the shell 21 .

[0038] The outlet section 12 is further provided with a diffusion section, the diameter of which gradually increases along the flow direction of the fluid in the fluid domain 1 .

[0039] The present application also discloses a method for manufacturing a perforated elbow structure of an inlet section of a locomotive pump, the manufacturing method comprising the following steps: S1, processing a shell: pressurizing and forming a pipe raw material into an arc of a corresponding shape through a pipe expansion process;

[0040] S2. Micro-hole processing: Staggered micro-holes are formed on the shell surface. At the same time, the processing angle is adjusted during the processing so that the axis of the micro-hole forms a 25° inclined angle with the shell surface;

[0041] S3. Processing guide strips: forming guide strips on the inner surface of the shell, and making the extending direction of the guide strips form an angle of 50° with the inclination direction of the micropores;

[0042] S4. Processing and fastening flange structure: welding connecting protrusions on both ends of the shell and processing bolt holes on the connecting protrusions;

[0043] S5. Install the diffuser: weld the diffuser at the outlet of the fluid domain, and the diameter of the diffuser gradually increases in the direction away from the outlet;

[0044] S6. Overall installation: insert the assembled structure into the fluid domain and fix the shell and the fluid domain with the bolt group through the bolt holes;

[0045] S7. Noise reduction detection: The noise reduction effect of the locomotive pump is detected at the rated flow rate. The maximum noise value is set to 8dB (A) within a range of 1m. At the same time, the noise value within the range of 1m of the current locomotive pump is detected at the rated flow rate. The size of Z is the noise value. If Z ≤ 8dB (A), it is judged that the noise reduction effect of the current locomotive pump is good and the current locomotive pump is qualified. Otherwise, it is judged that the noise reduction effect of the current locomotive pump is poor and the current locomotive pump is unqualified.

[0046] Preferably, the step S8 further includes detecting the connection strength of the locomotive pump, including the following steps: S81, setting the current pressure threshold of the locomotive pump to P, applying pressure to the locomotive pump with a pressure value of 2P, and continuing for a period of time T;

[0047] S82. After the T time period, the pre-tightening force at the fastening flange structure is detected. If the pre-tightening force loss is greater than 10%, it is determined that the current locomotive pump connection strength is poor and the locomotive pump is unqualified. Conversely, if the pre-tightening force loss is less than 10%, it is determined that the current locomotive pump connection strength is good and the locomotive pump is qualified.

[0048] The perforated elbow 2 structure of the locomotive pump inlet section of the present application achieves efficient noise reduction and structural reliability through the coordinated design of multiple components. Specifically, the inclined array of micropores 22 staggered on the shell 21, combined with the guide strips 23 on the inner side of the shell 21 to form an angle, can disperse the energy of the fluid impacting the pipeline, weaken the impact energy of the fluid, and effectively suppress eddy noise. At the same time, the perforated elbow 2 and the fluid domain 1 are fixedly connected by a fastening flange structure 3, which can effectively prevent the risk of leakage caused by the inevitable vibration during the operation of the locomotive pump. In addition, the thickened inner and outer walls of the curved portion of the shell 21 can ensure a smooth transition of the flow channel while increasing the deformation resistance of the shell 21. At the same time, the outer surface of the shell 21 can be provided with a shock-absorbing layer as needed. The shock-absorbing layer can further absorb the vibration generated during the operation of the locomotive pump, thereby forming a full-process noise reduction system for the fluid from the inlet section 11 of the fluid domain 1 to the outlet section 12 of the fluid domain 1, so that the above-mentioned locomotive pump has the advantages of low noise, high stability and long service life.

[0049] Furthermore, the surface of the shell 21 is provided with staggered micropores 22, and the micropores 22 are inclined relative to the surface of the shell 21. With the above scheme, the micropores 22 can guide the fluid to release pressure that is not relatively perpendicular to the surface of the shell 21 through the inclined angle, so that the pressure of the fluid is released along the tangential direction of the shell 21, avoiding the pressure being perpendicular to the surface of the shell 21 and emitting large noise, and the micropores 22 are staggered on the surface of the shell 21, which can effectively reduce the flow rate of a single hole through the porous diversion effect, and can reduce the noise caused by the excitation of the fluid. In addition, a guide strip 23 is provided in the shell 21 to cooperate with the micropores 22, which can further optimize the smooth distribution, and guide the disordered fluid in the fluid domain 1 into a circumferential laminar flow extending along the length direction of the fluid domain 1 through the guide layer, preventing the fluid in the fluid domain 1 from impacting the inner surface of the fluid domain 1 due to the change in flow direction, causing a secondary noise source, and a diffusion section is welded at the outlet section 12. The diffusion section reduces the flow rate at the outlet section 12, further suppressing the noise of the wake flow.

[0050] At the same time, a fastening flange structure 3 is provided between the perforated elbow 2 and the inlet section 11 of the fluid domain 1. The fastening flange structure 3 includes connecting protrusions 31 arranged on both sides of the shell 21 and a bolt group 32 arranged on the connecting protrusions 31, so that the shell 21 is rigidly locked with the fluid domain 1 through the positioning step 33 set at the inlet section 11 of the fluid domain 1, thereby improving the tensile strength of the perforated elbow 2 after installation, and improving the sealing performance between the shell 21 and the fluid domain 1. In combination with the shock-absorbing layer, the fatigue resistance of the locomotive pump during operation is improved, thereby extending the overall service life of the device.

[0051] Moreover, in the process of processing the locomotive pump of the present application, the processing flow is simple to operate and the processing accuracy is high. In the process of processing, multiple micropores 22 are integrated into multiple rows of micropore 22 arrays arranged along the length direction of the shell 21. The overall processing difficulty is small, and the guide strips 23 inside the shell 21 are formed by multi-axis linkage milling. The processing accuracy and efficiency are high, and the structural dimensions of each component are highly consistent. At the same time, after manufacturing is completed, the locomotive pump can be tested for noise reduction effect and assembly strength, thereby preventing the occurrence of unqualified products. The product qualification rate is high and the use effect is good.

[0052] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Common changes and substitutions made by those skilled in the art within the scope of the technical solution of the present invention should be included in the protection scope of the present invention.

Claims

1. A perforated elbow structure for an inlet section of a locomotive pump, comprising a pump body and a fluid domain (1) arranged on one side of the pump body, characterized in that: The fluid domain (1) comprises an inlet section (11) and an outlet section (12) fixedly connected to a pump body, a curved connecting section (13) being provided between the inlet section (11) and the outlet section (12), the inlet section (11) of the fluid domain (1) being provided with a perforated elbow (2), the perforated elbow (2) comprising a shell (21) matching the inlet section (11) of the fluid domain (1) and micropores (22) provided on the shell (21), the perforated elbow (2) being fixedly connected to the inlet section (11) of the fluid domain (1).

2. The locomotive pump inlet section perforated elbow structure according to claim 1, characterized in that: The micropores (22) on the perforated elbow (2) are arranged in a staggered manner on the shell (21), and the axis of each micropore (22) is arranged obliquely relative to the surface of the shell (21).

3. The locomotive pump inlet section perforated elbow structure according to claim 1, characterized in that: A guide strip (23) extending along the length direction of the shell (21) is provided on the inner side of the shell (21), and the extending direction of the guide strip (23) forms an angle with the axis of the microhole (22).

4. The locomotive pump inlet section perforated elbow structure according to claim 1, characterized in that: A fastening flange structure (3) is provided between the perforated elbow (2) and the inlet section (11) of the fluid domain (1). The fastening flange structure (3) includes connecting protrusions (31) provided on both sides of the interior of the shell (21) and a bolt group (32) provided on the connecting protrusions (31). A positioning step (33) is provided on the inner wall of the inlet section (11), and the connecting protrusion (31) is fixedly connected to the positioning step (33) via the bolt group (32).

5. The locomotive pump inlet section perforated elbow structure according to claim 1, characterized in that: The inner wall and outer wall of the curved portion of the shell (21) are thickened, and the ratio of the outer wall of the curved portion to the inner wall of the curved portion is 1.5:

1.

6. The locomotive pump inlet section perforated elbow structure according to claim 2, characterized in that: The micropores (22) are arranged on the shell (21) along the axial direction of the shell (21) to form a plurality of rows of micropore (22) arrays, and the micropores (22) of adjacent micropore (22) arrays are staggered in the circumferential direction of the shell (21).

7. The locomotive pump inlet section perforated elbow structure according to claim 1, characterized in that: The outlet section (12) is further provided with a diffusion section, the diameter of which gradually expands along the flow direction of the fluid in the fluid domain (1).

8. A method for manufacturing a perforated elbow structure at the inlet section of a locomotive pump according to any one of claims 1 to 7, characterized in that: The manufacturing method comprises the following steps: S1, processing the shell: pressurizing and forming the pipe raw material into an arc of corresponding shape through a pipe expansion process; S2. Micro-hole processing: Staggered micro-holes are formed on the shell surface. At the same time, the processing angle is adjusted during the processing so that the axis of the micro-hole forms a 25° inclined angle with the shell surface; S3. Processing guide strips: forming guide strips on the inner surface of the shell, and making the extending direction of the guide strips form an angle of 50° with the inclination direction of the micropores; S4. Processing and fastening flange structure: welding connecting protrusions on both ends of the shell and processing bolt holes on the connecting protrusions; S5. Installing the shock-absorbing layer: Injection-molding the shock-absorbing layer on the outer side of the shell so that the shock-absorbing layer is gap-matched with the inlet section of the fluid domain; S6. Install the diffuser: weld the diffuser at the outlet of the fluid domain, and the diameter of the diffuser gradually increases in the direction away from the outlet; S7. Overall installation: insert the assembled structure into the fluid domain, and fix the shell and the fluid domain with the bolt group through the bolt holes; S8. Noise reduction detection: The noise reduction effect of the locomotive pump is detected at the rated flow rate. The maximum noise value is set to 8dB (A) within a range of 1m. At the same time, the noise value within the range of 1m of the current locomotive pump is detected at the rated flow rate. The size of Z is the noise value. If Z ≤ 8dB (A), it is judged that the noise reduction effect of the current locomotive pump is good and the current locomotive pump is qualified. Otherwise, it is judged that the noise reduction effect of the current locomotive pump is poor and the current locomotive pump is unqualified.

9. The method for manufacturing a perforated elbow structure of an inlet section of a locomotive pump according to claim 8, characterized in that: The step S8 also includes detecting the connection strength of the locomotive pump, including the following steps: S81, setting the current pressure threshold of the locomotive pump to P, applying pressure to the locomotive pump, the pressure value is 2P, and lasting for a period of time T; S82. After the T time period, the pre-tightening force at the fastening flange structure is detected. If the pre-tightening force loss is greater than 10%, it is determined that the current locomotive pump connection strength is poor and the locomotive pump is unqualified. Conversely, if the pre-tightening force loss is less than 10%, it is determined that the current locomotive pump connection strength is good and the locomotive pump is qualified.

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