Connecting structure of compressor buffer tank and connecting pipe

Abstract

The utility model discloses compressor buffer tank and connecting structure of pipe, including buffer tank body, the fixed port is with buffer tank body and is provided with transition layer one side, the bottom welding of buffer tank body has trapezoidal reinforcing pad, is provided with elastic transition subassembly between the flange and pipe body, the inside of pipe body is paved with wear -resistant bushing, the inside fixed mounting of pipe body has the flow cone, is provided with anti -vortex baffle in the inside of buffer tank body. The utility model discloses technical scheme through design gradually variable formula arc transition layer, can eliminate the section sudden change between fixed port and buffer tank body and pipe body, design elastic transition subassembly can effectively absorb the high -frequency vibration of compressor generation, reduce the weld dynamic stress peak value, design wear -resistant bushing resistance abrasive wear, cooperate flow cone and avoid the direct impact of airflow of pipe and buffer tank's welding root, utilize the steady flow effect of anti -vortex baffle and break the airflow vortex in tank.

Description

Technical Field

[0001] This utility model relates to the field of mechanical engineering, and in particular to the connection structure between the compressor buffer tank and the connecting pipe. Background Technology

[0002] In the existing mechanical engineering industry, the connection structure design between the buffer tank and the pipe needs to be adapted to the pressure level of the compressor (including low pressure ≤2MPa, medium pressure 2-10MPa, high pressure >10MPa), the characteristics of the medium (clean gas, containing impurities and corrosiveness) and the vibration conditions. It is mainly divided into two categories: rigid connection and flexible connection.

[0003] In current technology, the primary intake buffer tank of the air compressor is connected to the compressor head via a pipe and flange, with the pipe and buffer tank fixed by welding. After the unit has been running for a period of time, operators have discovered cracks at the weld joint between the pipe and the buffer tank, posing a certain safety hazard. To address this issue, the connection structure between the pipe and the buffer tank has been optimized. Utility Model Content

[0004] The main purpose of this invention is to propose a connection structure between the compressor buffer tank and the connecting pipe, which aims to eliminate cracking problems and ensure the safe and stable operation of the equipment.

[0005] To achieve the above objectives, the present invention proposes a compressor buffer tank and pipe connection structure, including a buffer tank body, a stress dispersion structure at the bottom of the buffer tank body, and an anti-erosion structure inside the buffer tank body. The stress dispersion structure includes a fixed port at the bottom of the buffer tank, a transition layer on the side of the fixed port that is connected to the buffer tank, a connecting pipe body welded to the inner side of the fixed port, a trapezoidal reinforcing plate welded to the bottom of the buffer tank, a flange at the bottom of the connecting pipe body, and an elastic transition component between the flange and the connecting pipe body. The anti-erosion structure includes a wear-resistant bushing laid on the inner side of the connecting pipe, a flow guide cone fixedly installed on the inner side of the connecting pipe, and an anti-vortex baffle installed inside the buffer tank.

[0006] In one embodiment, the transition layer is an arc-shaped structure with a gradually changing thickness. The gradual length is 50 mm, the thickness is 10 mm on the side of the transition layer that contacts the buffer tank, and 8 mm on the side of the transition layer that contacts the connecting pipe.

[0007] In one embodiment, the connecting pipe body is welded to the fixed port and the inner side of the transition layer, and extends into the interior of the buffer tank. The end of the connecting pipe body extending into the interior of the buffer tank has a beveled structure with an angle of 45°, and the thickness of the connecting pipe body is 8mm.

[0008] In one embodiment, the trapezoidal reinforcing plate includes a first trapezoidal plate and a second trapezoidal plate distributed vertically. The inner sides of the first trapezoidal plate and the second trapezoidal plate are each provided with two through-holes, and the diameter of the through-holes is 15mm.

[0009] In one embodiment, the first trapezoidal plate and the second trapezoidal plate have the same area and are disposed on the left and right sides of the connecting pipe body. The top of the second trapezoidal plate is welded to the buffer tank body, and the bottom of the first trapezoidal plate is welded to the flange.

[0010] In one embodiment, a stepped annular groove is provided at the bottom of the connecting pipe body, and the elastic transition component includes a fixed rubber sealing ring embedded in the inner side of the annular groove, and a metal corrugated compensator with an annular structure is fixed at the bottom of the rubber sealing ring.

[0011] In one embodiment, the bottom of the metal bellows compensator is provided with a screw hole, and the flange is connected to the metal bellows compensator by a number of fixing bolts.

[0012] In one embodiment, the wear-resistant bushing is an STL-6 wear-resistant weld overlay structure with a thickness of 3mm, and the wear-resistant bushing is axially distributed along the inner wall of the connecting pipe.

[0013] In one embodiment, the guide cone is a hard alloy structure, which is distributed along the axial direction of the connecting pipe body, and the cone angle of the guide cone is 30° at one end.

[0014] In one embodiment, the anti-vortex baffle is disposed opposite the end of the connecting pipe body facing the inside of the buffer tank, and its outer side is welded and fixed to the inner bottom wall of the buffer tank.

[0015] The technical solution of this utility model, by designing a gradually changing arc transition layer, can eliminate the abrupt change in cross-section between the fixed port and the buffer tank and the connecting pipe, effectively reduce the stress concentration coefficient at the weld, and avoid the initiation of microcracks caused by bending moment. The segmented hollow trapezoidal reinforcing plate forms a double support point, which optimizes the stress model of the cantilever beam of the connecting pipe into a multi-point distributed stress, improves the connection stiffness, and reduces the additional load on the reinforcing plate itself through the hollow design, avoiding stress transfer caused by excessive local stiffness. The design of the flexible transition component, which combines a rubber sealing ring with a metal bellows compensator, can effectively absorb the high-frequency vibration generated by the compressor and the thermal expansion and contraction displacement of the connecting pipe, reduce the peak dynamic stress of the weld, and solve the problem of weld cracking during long-term operation. Furthermore, the design incorporates wear-resistant bushings to resist abrasive wear from gases containing impurities. Combined with the airflow guiding effect of the guide cone, it prevents high-pressure, high-speed airflow from directly impacting the weld root of the connecting pipe and the buffer tank, reducing the dynamic additional load caused by airflow pulsation. The anti-vortex baffle's flow stabilization effect breaks up the airflow vortices inside the tank, avoiding localized erosion and corrosion of the tank wall caused by vortices. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0017] Figure 1 This is a schematic diagram showing the optimized connection between the buffer tank and the connecting pipe structure of this utility model; Figure 2 This is a schematic diagram of the conventional connection between the buffer tank and the connecting pipe structure of this utility model; Figure 3 This is a schematic diagram of the pipe body structure of this utility model; Figure 4 This is a bottom view of the connector body of this utility model.

[0018] The annotations in the attached figures are explained as follows: 1. Buffer tank; 2. Stress dispersion structure; 201. Fixed port; 202. Transition layer; 203. Connecting pipe body; 204. Trapezoidal reinforcing plate; 2041. First trapezoidal plate; 2042. Second trapezoidal plate; 205. Flange; 206. Elastic transition component; 2061. Rubber sealing ring; 2062. Metal corrugated compensator; 3. Anti-erosion structure; 301. Wear-resistant bushing; 302. Flow guide cone; 303. Anti-vortex baffle; 4. Hollowed-out slot; 5. Annular groove. Detailed Implementation

[0019] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0020] It should be noted that if the embodiments of this utility model involve directional indicators (such as up, down, left, right, front, back, etc.), the directional indicators are only used to explain the relative positional relationship and movement of the components in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicators will also change accordingly.

[0021] In this utility model, unless otherwise explicitly specified and limited, the terms "connection," "fixing," etc., should be interpreted broadly. For example, "fixing" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0022] Furthermore, if the embodiments of this utility model involve descriptions such as "first" or "second," these descriptions are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined with "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the meaning of "and / or" throughout the text includes three parallel solutions; for example, "A and / or B" includes solution A, solution B, or a solution where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or impossible to implement, it should be considered that such a combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0023] The core objective of this utility model in implementing the overall assembly of the buffer tank 1, stress dispersion structure 2, and erosion prevention structure 3 is to establish a three-layer structural framework of main body-stress dispersion-erosion prevention. Specific operational steps include: 1) Pretreatment of buffer tank 1: Φ325×8mm seamless steel pipe is selected and cut to a design length of 915mm. The end faces of both ends are machined by lathe (perpendicularity deviation ≤0.1mm). The oxide scale on the inner and outer walls of the tank is removed by sandblasting (Sa2.5 grade) to avoid impurities affecting the weld quality during subsequent welding. At the center of the bottom of the buffer tank, a Φ108mm fixed port 201 is opened by CNC drilling machine. The edge of the port is blunted by milling machine to prevent scratching the transition layer during assembly.

[0024] 2) Stress dispersion structure 2 pre-installation and positioning: The transition layer 202, pipe body 203, trapezoidal reinforcing plate 204, flange 205, and elastic transition component 206 are pre-installed according to the design position: the transition layer is embedded in the fixed port, the pipe body is inserted into the inner side of the transition layer, the trapezoidal reinforcing plate 204 is symmetrically distributed on both sides of the pipe, and the flange is connected to the bottom of the pipe through the elastic transition component. The perpendicularity of the pipe axis to the buffer tank is calibrated with a right angle ruler (deviation ≤ 0.5mm), and the relative positions of each component are fixed by spot welding (each weld point is 10mm long and the interval is 50mm).

[0025] 3) Anti-scouring structure 3 pre-installation: In advance, a wear-resistant bushing 301 is laid on the inner wall of the pipe, a guide cone 302 is fixed on the inner side of the pipe extension end, and an anti-vortex baffle 303 is welded on the bottom wall of the buffer tank 1 to ensure that the anti-vortex baffle is directly facing the pipe extension end. After the pre-installation is completed, the internal structure of the tank is checked by endoscope to ensure that there is no interference.

[0026] 4) Overall welding and fixing: The welding sequence is from the inside to the outside: First, weld the inner joint between the pipe body 203 and the transition layer 202, then weld the joint between the transition layer 202 and the buffer tank 1, and finally weld the joint between the trapezoidal reinforcing plate 204 and the tank and flange 205. All welds must achieve full penetration. After welding, clean the slag and mark the weld position.

[0027] Reference Figure 1 In one embodiment of the utility model, the gradient arc transition layer 202 eliminates abrupt changes in cross-section through its arc gradient structure, reducing stress concentration between the fixed port and the tank body and connecting pipe. The implementation steps include: 1) Transition layer (202) material and processing: 20# steel plate (10mm thick) is selected. The arc-shaped gradient structure drawing is drawn by CAD (gradient length 50mm, tank side thickness 10mm, pipe side thickness 8mm, inner arc radius 54mm matching the inner diameter of the fixed port Φ108mm). After laser cutting, it is hot-pressed by CNC bending machine (heating temperature 800℃, heat preservation for 10min) to ensure that the arc surface is smooth and wrinkle-free. The contact surfaces on both sides of the transition layer were ground using a grinding machine (roughness Ra≤1.6μm), and the thickness was measured with a micrometer: 10mm±0.1mm on the tank contact side, 8mm±0.1mm on the pipe contact side, and the gradient length was 50mm±0.5mm to ensure that the dimensional accuracy met the design requirements.

[0028] 2) Welding and inspection of the transition layer: The transition layer is embedded into the fixed port 201. The fit gap between the transition layer and the tank body and the fixed port is checked with a feeler gauge (≤0.5mm). It is fixed by spot welding (4 points, each point is 15mm long). The transition layer and the tank body (weld leg height 8mm) and the transition layer and the connecting pipe (weld leg height 6mm) are welded by manual arc welding. The segmented back welding method is used during welding (each segment is 20mm, and the segments are cooled to room temperature at intervals) to reduce welding deformation. After welding, the weld is inspected by penetrant testing (PT) to ensure that there are no defects such as porosity and cracks. At the same time, a stress detector is used to measure the stress around the transition layer, and the stress concentration factor is controlled below 1.2.

[0029] Reference Figure 3 In one embodiment of the utility model, the 45° inclined pipe body achieves reliable welding between the pipe body and the tank body and the transition layer. The 45° inclined structure optimizes the airflow distribution inside the tank. The implementation steps include: 1) Pipe body 203 processing: Select Φ108×8mm 20# seamless steel pipe, cut to a length of 250mm, and use a lathe to process a 45° bevel (bevel length 15mm, angle deviation ≤0.5°), and bevel the end of the bevel. A stepped annular groove 5 is machined at the bottom of the pipe using a drilling machine: the groove is 5mm deep, 10mm wide, and the verticality deviation of the groove wall is ≤0.1mm, which is used for subsequent embedding of rubber sealing rings.

[0030] 2) Welding and positioning of the connecting pipe: Insert the connecting pipe into the inside of the fixed port 201 and the transition layer 202, ensuring that the length of the connecting pipe extending into the tank is 50mm, with the 45° bevel facing the center of the tank. Use a right-angle ruler to calibrate the perpendicularity of the connecting pipe axis to the buffer tank (deviation ≤0.5mm), and fix it by spot welding (3 points, each point 10mm long); The inner joint between the nozzle and the fixed port is welded using argon arc welding (shielding gas flow rate 15L / min, welding current 90-110A). After welding, the weld penetration is checked by ultrasonic testing (UT) (≥6mm, to ensure full penetration). After welding, a water pressure test is performed on the pipe body: fill the pipe with water at 2.7MPa (1.5 times the design pressure), maintain the pressure for 30 minutes, check for leaks in the weld, and confirm the sealing performance of the pipe.

[0031] Reference Figure 3 In one embodiment of the utility model, the segmented hollow trapezoidal reinforcing plate achieves stress dispersion and lightweighting through its segmented and hollowed-out design, avoiding excessive local stiffness. The implementation steps include: 1) Processing of trapezoidal reinforcing plates: Select 8mm thick 20# steel plates, cut and process the first trapezoidal plate 2041 and the second trapezoidal plate 2042, both with dimensions of 98×56×30mm (top base×bottom base×height). Use a drilling machine to process two Φ15mm hollow slots (4) on the inner side of each plate. The center of the hole is ≥15mm from the edge of the plate to avoid weakening the strength of the plate. Use a grinding wheel to grind the edge of the plate (roughness Ra≤3.2μm), and measure the plate size with calipers (deviation≤0.2mm) to ensure that the area of ​​the two plates is consistent (error≤1cm²).

[0032] 2) Welding and fixing of trapezoidal reinforcing plates: The first trapezoidal plate and the second trapezoidal plate are symmetrically installed on the left and right sides of the connecting pipe body 203. The top of the second trapezoidal plate is attached to the bottom of the buffer tank 1, and the bottom of the first trapezoidal plate is attached to the top of the flange 205. The verticality of the plates is calibrated with a square (deviation ≤ 0.5°). The joint between the second trapezoidal plate and the tank body (weld leg height 6mm) and the joint between the first trapezoidal plate and the flange (weld leg height 6mm) are welded by manual arc welding. A small current (100-120A) is used during welding to reduce thermal deformation. After welding, the weight reduction effect of the reinforcing plate is measured by weighing: the weight of a single hollow plate is about 0.35Kg, which is 20% lighter than the solid plate (0.44Kg). At the same time, the connection stiffness is measured by a stiffness tester, which is 35% higher than the original single solid plate structure.

[0033] Reference Figure 3 In one embodiment of the utility model, the trapezoidal reinforcing plate is installed symmetrically on both sides to ensure balanced stress distribution on the pipe and avoid stress concentration on one side. The implementation steps include: 1) Reinforcing plate positioning marks: Mark the installation position of the reinforcing plate at the bottom of the buffer tank 1 and on both sides of the connecting pipe 203 using a scribing ruler: with the connecting pipe axis as the center, the left and right symmetrical deviation is ≤0.5mm, the top of the second trapezoidal plate is 20mm from the bottom edge of the tank, and the bottom of the first trapezoidal plate is 15mm from the top edge of the flange; punch holes (1mm deep) at the marked positions to ensure accurate positioning during welding.

[0034] 2) Symmetrical welding and inspection Weld in the following order: first weld the joint between the second trapezoidal plate on the left and the tank body, then weld the joint between the second trapezoidal plate on the right and the tank body, then weld the joint between the first trapezoidal plate on the left and the flange, and finally weld the joint between the first trapezoidal plate on the right and the flange. Each side weld is divided into 3 sections (30mm each) to avoid misalignment of the pipe due to welding on one side. After welding, the offset of the pipe axis is measured with a dial indicator and is ≤0.3mm. The stress distribution of the reinforcing plates on both sides is measured with a stress strain gauge to ensure that the stress difference between the two sides is ≤10MPa, so as to achieve stress balance.

[0035] Reference Figure 4In one embodiment of the utility model, the elastic transition component and the annular groove absorb vibration and thermal displacement and protect the weld through the combination of rubber sealing ring and metal corrugated compensator. The implementation steps include: 1) Processing of annular groove and elastic component: At the bottom of the pipe body 203, a stepped annular groove 5 is processed by CNC milling machine: groove depth 5mm, groove width 10mm, groove bottom roughness Ra≤1.6μm, to ensure that the rubber sealing ring is not loose after being embedded; The 2061 rubber sealing ring is made of nitrile rubber (Shore hardness 70±5), with dimensions of Φ108×Φ96×5mm. After molding, the surface is cleaned with alcohol to remove the mold release agent. The 2062 metal corrugated compensator is made of 304 stainless steel, with a specification of Φ108×3 waves (wave height 8mm, wave pitch 15mm), a compensation amount of ±3mm, and 8 Φ12mm screw holes machined at the bottom using a drilling machine.

[0036] 2) Elastic component assembly and fixing: Embed the rubber sealing ring into the annular groove 5, and gently tap it with a rubber hammer to compact it (embedding depth 5mm, no protrusion). Check the sealing performance by passing the air tightness test (fill with 0.5MPa compressed air, hold pressure for 10min, no leakage). The top of the metal corrugated compensator 2062 is attached to the rubber sealing ring. The joint between the compensator and the pipe is welded using argon arc welding (ER308 welding wire Φ2.0mm, welding current 70-80A). The welding slag is cleaned after welding. Connect flange 205 to the metal bellows compensator with fixing bolts (M12×30, grade 8.8) using a torque wrench. Tighten them in a diagonal sequence, controlling the torque value to 35-40 N·m to ensure uniform stress on the flange surface.

[0037] Reference Figure 4 In one embodiment of the utility model, the flange and the metal bellows compensator are detachably connected by bolts, which is suitable for compressor head docking and subsequent maintenance. The implementation steps include: 1) Flange and compensator pretreatment: Flange 205 is selected from PN1.6, DN108 20# steel neck flange, with 8 Φ12.5mm elongated holes (20mm radial length to accommodate thermal displacement), and the flange sealing surface roughness Ra≤1.6μm; The bottom screw hole of the 2062 metal bellows compensator is tapped (M12), and the thread accuracy (6H grade) is calibrated with a tap to ensure that the bolt is screwed in smoothly.

[0038] 2) Bolt connection and sealing inspection: Place a nitrile rubber gasket (3mm thick, Φ108×Φ90mm) between the flange and the metal bellows compensator, aligning the oblong hole and the bolt hole; Insert the 8.8 grade fixing bolts (with spring washers) and tighten them using a torque wrench in a "diagonal cycle" manner: first pre-tighten to 15 N·m, then tighten in two stages to 35-40 N·m. After each tightening, check the parallelism of the flange face (deviation ≤0.1 mm). Conduct a water pressure test: Fill the sealing cavity of the flange and compensator with 2.0 MPa of water, maintain the pressure for 30 minutes, check the sealing surface for leakage, and confirm the connection sealing performance.

[0039] Reference Figure 1 In one embodiment of the utility model, the STL-6 wear-resistant bushing improves the wear resistance of the inner wall of the connecting pipe and resists the erosion of impurity-containing gas by designing a wear-resistant weld overlay layer. The implementation steps include: 1) Preparation for surfacing wear-resistant bushing 301: The pipe body 203 is fixed on the positioner, and the inner wall is cleaned with acetone to remove oil stains; Select STL-6 wear-resistant welding wire (diameter Φ2.4mm), and adjust the submerged arc welding equipment parameters as follows: welding current 300-350A, voltage 28-32V, welding speed 300mm / min, shielding gas (Ar+CO, ratio 8:2) flow rate 20L / min.

[0040] 2) Welding and post-treatment: Axial welding is carried out along the inner wall of the pipe, with the welding area extending from the pipe inlet to 50mm inside the tank. The welding thickness is 3mm±0.2mm. Multi-layer and multi-pass welding is adopted (2 layers, 1-2 passes per layer) to avoid cracking caused by excessive single-layer welding. After the welding is completed, tempering treatment at 450℃×2h is carried out to eliminate welding stress. The bushing surface was ground using a grinding machine (roughness Ra≤6.3μm), the hardness was measured using a hardness tester (HRC≥55), and the uniformity of the bushing thickness was checked using an ultrasonic thickness gauge (deviation≤0.3mm).

[0041] Reference Figure 1 In one embodiment of the utility model, the hard alloy guide cone, with a 30° cone angle, optimizes the airflow direction and avoids direct airflow impact on the weld root of the pipe and the tank body. The implementation steps include: 1) The guide cone 302 is made of WC cemented carbide (containing 10% cobalt) and is machined into a guide cone with a 30° cone angle (large end Φ30mm, small end Φ10mm, length 80mm) by CNC lathe. The cone angle deviation is ≤0.5° and the surface roughness Ra≤0.8μm. A 20# steel connecting post (Φ10×20mm) is welded to the small end of the guide cone. The surface of the connecting post is tapped with M8 thread (depth 15mm) for fixing to the pipe.

[0042] 2) The guide cone is installed and positioned at the preset position inside the pipe body 203. A fixing seat with M8 internal thread (20# steel, 10mm high) is welded on. The coaxiality deviation between the axis of the fixing seat and the axis of the pipe is ≤0.3mm. The guide cone connecting column is screwed into the fixing seat and tightened with a torque wrench (torque value 10-12N・m). The connecting column and the fixing seat are then fixed by spot welding (2 points, each 5mm long) to prevent loosening. The position of the guide cone is checked with an endoscope: the cone tip faces the pipe inlet, and the deviation between the axis and the axis of the pipe is ≤0.5mm to ensure the airflow guiding effect.

[0043] In one embodiment of the utility model, the anti-vortex baffle breaks up the vortex inside the tank by means of an arc-shaped baffle, thereby reducing airflow pulsation and tank wall erosion. The implementation steps include: 1) Anti-vortex baffle 303 processing: 6mm thick 20# steel plate is selected and CNC cut into an arc shape (the arc matches the inner wall of the buffer tank Φ325mm, the height is 205mm, and the width is 100mm), the edge is blunted (R1mm), and the surface is sandblasted (Sa2.5 grade).

[0044] 2) Welding and positioning of baffle: On the bottom wall of the buffer tank 1, directly opposite the extension end of the connecting pipe 203, the baffle is positioned by tooling: the distance between the baffle and the outlet of the connecting pipe is 50mm±2mm, and the deviation between the axis of the baffle and the axis of the connecting pipe is ≤1mm. The joint between the baffle and the bottom wall of the tank is welded by manual arc welding (continuous fillet weld, weld leg height 6mm). A small current (100-120A) is used during welding to avoid deformation of the tank. After welding, the weld quality is inspected with an endoscope to ensure there are no defects such as weld beads or incomplete penetration. At the same time, compressed air (0.8MPa) is introduced into the tank, and the airflow velocity fluctuation inside the tank is measured with an airflow velocity meter to be ≤±5% to confirm the anti-vortex effect.

[0045] It should be noted that the overall processing procedure in this embodiment includes: 1. Material preparation 1) Connector processing: 20# seamless steel pipe is selected, and the thickness is increased from the original 6mm to 8mm. The length is cut according to the design drawings. The end of the connector is processed with a bevel to ensure the penetration when welding with the tank body.

[0046] 2) Reinforcing plate fabrication: A new trapezoidal reinforcing plate with dimensions of 98×56×30×8mm is added. After cutting, the edges are ground to remove burrs. It needs to match the tank body outline and flange. The fit is checked in advance.

[0047] 2. Assembly and Welding 1) Connector positioning: After the connector is welded to the flange, insert the connector into the buffer tank, ensuring that the axis is perpendicular to the buffer tank with a deviation of ≤1mm. Temporarily fix it with tack welding, and proceed with formal welding after verifying that the position is correct.

[0048] 2) Welding of reinforcing plates: Weld trapezoidal reinforcing plates symmetrically on both sides of the pipe. Use segmented welding to reduce thermal deformation. The welds between the reinforcing plates and the tank body and flanges must be fully penetrated. Clean the weld slag and check the weld quality after welding.

[0049] 3) Timing control: After the buffer tank, compressor, and inlet pipeline are installed and positioned as a whole, the final welding of the connecting pipes is carried out to avoid assembly stress; 4) Overall performance verification: Stress test: Under the rated operating conditions of the compressor (vibration frequency of 30Hz, intake pressure of 1.2MPa), the peak dynamic stress at the weld is ≤150MPa (the fatigue limit of steel is 170MPa), and there is no stress concentration; Wear test: After running for 1000 hours in a simulated dust-laden airflow (dust concentration 50mg / m³), the wear on the inner wall of the pipe was ≤0.02mm; Long-term operation verification: After 12 months of continuous operation, there were no cracks in the welds, no leaks in the sealing surfaces, and the equipment operated stably.

[0050] The above description is only a preferred embodiment of the present utility model and does not limit the patent scope of the present utility model. All equivalent structural transformations made under the inventive concept of the present utility model using the contents of the present utility model specification and drawings, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present utility model.

Claims

1. A compressor buffer tank and connecting pipe connection structure, comprising a buffer tank body (1), characterized in that, The bottom of the buffer tank (1) is provided with a stress dispersion structure (2), and the interior of the buffer tank (1) is provided with an anti-erosion structure (3). The stress dispersion structure (2) includes a fixed port (201) at the bottom of the buffer tank (1), a transition layer (202) is provided on the side of the fixed port (201) that is connected to the buffer tank (1), a connecting pipe (203) is welded to the inner side of the fixed port (201), a trapezoidal reinforcing plate (204) is welded to the bottom of the buffer tank (1), a flange (205) is provided at the bottom of the connecting pipe (203), and an elastic transition component (206) is provided between the flange (205) and the connecting pipe (203). The anti-scouring structure (3) includes a wear-resistant bushing (301) laid on the inner side of the pipe body (203), a flow guide cone (302) fixedly installed on the inner side of the pipe body (203), and an anti-vortex baffle (303) provided inside the buffer tank (1).

2. The compressor buffer tank and pipe connection structure as described in claim 1, characterized in that, The transition layer (202) is an arc-shaped structure with a gradually changing thickness. The gradual length is 50mm. The thickness on the side of the transition layer (202) that contacts the buffer tank (1) is 10mm, and the thickness on the side of the transition layer (202) that contacts the connecting pipe (203) is 8mm.

3. The compressor buffer tank and pipe connection structure as described in claim 1, characterized in that, The connecting pipe body (203) is welded to the inside of the fixed port (201) and the transition layer (202) and extends into the interior of the buffer tank (1). The end of the connecting pipe body (203) extending into the interior of the buffer tank (1) is a bevel structure with an angle of 45°. The thickness of the connecting pipe body (203) is 8mm.

4. The compressor buffer tank and adapter connection structure according to claim 1, wherein The trapezoidal reinforcing plate (204) includes a first trapezoidal plate (2041) and a second trapezoidal plate (2042) distributed vertically. The inner sides of the first trapezoidal plate (2041) and the second trapezoidal plate (2042) are provided with two through slots (4), and the diameter of the through slots (4) is 15mm.

5. The compressor buffer tank and pipe connection structure as described in claim 4, characterized in that, The first trapezoidal plate (2041) and the second trapezoidal plate (2042) have the same area and are set on the left and right sides of the connecting pipe body (203). The top of the second trapezoidal plate (2042) is welded to the buffer tank body (1), and the bottom of the first trapezoidal plate (2041) is welded to the flange (205).

6. The compressor buffer tank and pipe connection structure as described in claim 1, characterized in that, A stepped annular groove (5) is provided at the bottom of the connecting pipe body (203). The elastic transition component (206) includes a rubber sealing ring (2061) embedded and fixed inside the annular groove (5). A metal corrugated compensator (2062) with an annular structure is fixed at the bottom of the rubber sealing ring (2061).

7. The compressor buffer tank and adapter connection structure as set forth in claim 6, characterized by, The bottom of the metal corrugated compensator (2062) is provided with screw holes, and the flange (205) is connected to the metal corrugated compensator (2062) by a number of fixing bolts.

8. The compressor buffer tank and adapter connection structure as set forth in claim 1, wherein, The wear-resistant bushing (301) is an STL-6 wear-resistant weld overlay structure with a thickness of 3mm. The wear-resistant bushing (301) is axially distributed along the inner wall of the connecting pipe body (203).

9. The compressor buffer tank and pipe connection structure as described in claim 1, characterized in that, The guide cone (302) is a hard alloy structure, which is distributed along the axial direction of the connecting pipe body (203), and the cone angle of the guide cone (302) is 30° at one end.

10. The compressor buffer tank and pipe connection structure as described in claim 1, characterized in that, The anti-vortex baffle (303) is set at one end of the connecting pipe (203) facing the inside of the buffer tank (1), and its outer side is welded and fixed to the inner bottom wall of the buffer tank (1).

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