Connecting device with round top and square bottom

Abstract

The utility model belongs to the technical field of diesel engine main engine manufacturing, and particularly relates to a round-top and square-bottom connecting device. The outer diameter of the upper end round flange is matched with that of a round flange of a ship smoke exhaust pipe; one end of the transition round pipe is welded to the upper end round flange, and the other end is gradually shrunk into a square section; the lower square flange is welded to the square end of the transition round pipe. The lower straight pipe section is vertically connected to the lower end of the lower square flange; the pressure sensor welding seat is arranged on the side wall of the transition circular pipe and is used for mounting a pressure sensor; the temperature sensor welding seat is arranged on the side wall of the lower straight pipe section and is used for mounting a temperature sensor; and the at least two screwed plugs are respectively in threaded connection with the pressure sensor welding seat and the temperature sensor welding seat and are used for plugging or opening the sensor interface. The structure adaptability is enhanced, the safety is high, the installation efficiency is high, and the installation difficulty is reduced.

Description

Technical Field

[0001] This invention belongs to the field of diesel engine main unit manufacturing technology, specifically relating to a round-and-square connection device. Background Technology

[0002] In the exhaust system of large, low-speed marine diesel engines, the connector between the turbocharger exhaust outlet and the ship's exhaust pipe, commonly known as the "round top and square bottom," is a key component to ensure efficient exhaust gas transmission. Since the turbocharger exhaust outlet is usually square while the ship's exhaust pipe is round, the traditional round top and square bottom design must take into account the size and space compatibility of both.

[0003] Existing connection devices have significant shortcomings. The dimensions of the exhaust outlet flanges vary greatly among different turbocharger models, resulting in poor versatility. Shipyard exhaust pipe flanges come in diverse specifications, requiring customized designs for connectors, leading to long development cycles and high costs. The compact space within the diesel engine compartment makes the existing round-and-square structure prone to interference with surrounding components, affecting installation efficiency. Furthermore, the lack of integrated sensor mounting interfaces prevents real-time monitoring of exhaust pressure and temperature. In addition, existing connectors often employ simple, gradual transition structures, which are insufficient to meet the sealing and durability requirements under complex operating conditions. Therefore, a novel round-and-square connection device with high adaptability, modular design, and sensor integration capabilities is urgently needed to overcome these technical bottlenecks. Utility Model Content

[0004] This invention addresses the problems of existing round-to-square connection devices, which suffer from large size differences in the exhaust outlet flange of the same type of turbocharger, poor versatility, resulting in long development cycles and high costs; easy interference with surrounding components, affecting installation efficiency; lack of integrated sensor installation interfaces, making it impossible to monitor exhaust pressure and temperature in real time; and difficulty in meeting the sealing and durability requirements under complex operating conditions. Therefore, this invention proposes a round-to-square connection device, comprising: an upper circular flange whose outer diameter matches the circular flange of the ship's exhaust pipe;

[0005] The transitional circular tube has one end welded to the upper circular flange and the other end gradually narrows to a square cross section.

[0006] The lower flange, whose dimensions are adapted to the exhaust outlet flange of the low-speed diesel engine turbocharger, is welded to the square end of the transition round pipe;

[0007] The lower straight pipe section is vertically connected to the lower end of the lower flange, and its length is customized according to the cabin space requirements.

[0008] A pressure sensor mounting base is provided on the side wall of the transition tube for mounting the pressure sensor.

[0009] A temperature sensor welding base is installed on the side wall of the lower straight pipe section for mounting temperature sensors.

[0010] And at least two plugs are respectively screwed to the pressure sensor welding seat and the temperature sensor welding seat, used for plugging or opening the sensor interface.

[0011] According to the connecting device of the above-mentioned kind, the length of the lower straight pipe section is 200-500 mm, and the outer wall is provided with annular reinforcing ribs.

[0012] According to the connecting device of the above-mentioned kind, the taper angle of the transition pipe is 15°-30°, and the inner wall is covered with high-temperature-resistant ceramic coating.

[0013] According to the connecting device of the above-mentioned kind, the axes of the pressure sensor welding seat and the temperature sensor welding seat are perpendicular to each other, and the distance from the end surface of the lower flange is not less than 100 mm.

[0014] According to the connecting device of the above-mentioned kind, a graphite sealing gasket is arranged between the upper end flange and the flange of the ship exhaust pipe.

[0015] According to the connecting device of the above-mentioned kind, the bolt hole of the lower flange is designed as a waist-shaped hole, allowing an installation position deviation of ±5 mm.

[0016] According to the connecting device of the above-mentioned kind, an ultrasonic flaw detection mark is arranged at the welding seam between the transition pipe and the lower straight pipe section.

[0017] According to the connecting device of the above-mentioned kind, the cross section of the annular reinforcing rib is trapezoidal, the height is 10-15 mm, and the interval is 50-80 mm.

[0018] According to the connecting device of the above-mentioned kind, the thread specification of the plug is M20x1.5, and the material is 316L stainless steel.

[0019] According to the connecting device of the above-mentioned kind, the overall material of the device is heat-resistant alloy steel, and the surface is sprayed with an aluminum-silicon anti-oxidation coating.

[0020] The beneficial effects of the present application are as follows:

[0021] 1. The special design of the lower straight pipe section effectively avoids interference with surrounding components, meets different cabin space requirements, and the size of the lower flange and the upper end flange is modularly matched, the structural adaptability is enhanced, and various superchargers and ship exhaust pipe specifications can be quickly adapted.

[0022] 2. The built-in pressure sensor welding seat and temperature sensor welding seat are functionally integrated, realize real-time monitoring of exhaust parameters, and improve system safety; the plug is convenient for maintenance and sensor replacement.

[0023] 3. The transition pipe length of the present application is designed in coordination with the size of the flange, reducing the on-site adjustment process; the overall structure is compact, the installation efficiency is optimized, and the installation complexity is reduced.

[0024] 4. The present application adopts segmented welding and reinforcement design, enhances the stiffness and sealing of the connecting piece, adapts to high vibration and high temperature working conditions of diesel engines, and improves durability.

[0025] The present application shortens the development cycle and reduces the manufacturing cost through parameterized modeling and standardized interface design, and provides a technical basis for subsequent derivative models. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a front view of a structure schematic diagram of a heaven round place connecting device of the present application.

[0027] Figure 2 is a perspective view of a structure schematic diagram of a heaven round place connecting device of the present application.

[0028] In the figure: 1 - upper end circular flange, 2 - transition pipe, 3 - lower method flange, 4 - lower straight pipe section, 5 - pressure sensor welding seat, 6 - temperature sensor welding seat, 7, 8 - plug. DETAILED DESCRIPTION

[0029] PREFERRED EMBODIMENT

[0030] The technical solutions in the embodiments of the present application will be described clearly and completely below in combination with the drawings in the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0031] As shown in Figure 1 , Figure 2 : in this embodiment, a heaven round place connecting device comprises:

[0032] The upper end circular flange 1 matches the outer diameter of the circular flange of the ship exhaust pipe;

[0033] The transition pipe 2 is welded to the upper end circular flange 1 at one end and is tapered to a square section at the other end;

[0034] The lower method flange 3 is adapted to the size of the exhaust outlet flange of the low-speed diesel engine supercharger and is welded to the square end of the transition pipe 2;

[0035] The lower straight pipe section 4 is connected vertically to the lower end of the lower method flange 3, and the length is customized according to the requirements of the engine room space;

[0036] The pressure sensor welding seat 5 is arranged on the side wall of the transition pipe 2 and is used for installing the pressure sensor;

[0037] Temperature sensor welding seat 6 is arranged on the side wall of the lower straight pipe section 4, and is used for mounting a temperature sensor;

[0038] And at least two plugs 78 are respectively threadedly connected with the pressure sensor welding seat 5 and the temperature sensor welding seat 6, and are used for plugging or opening the sensor interfaces.

[0039] The length of the lower straight pipe section 4 is 200-500 mm, and the outer wall of the lower straight pipe section 4 is provided with annular reinforcing ribs.

[0040] The taper angle of the transition circular pipe 2 is 15°-30°, and the inner wall of the transition circular pipe 2 is covered with a high-temperature-resistant ceramic coating.

[0041] The axes of the pressure sensor welding seat 5 and the temperature sensor welding seat 6 are perpendicular to each other, and the distance from the end surface of the lower straight pipe section 3 is not less than 100 mm.

[0042] The graphite sealing gasket is arranged between the upper end circular flange 1 and the flange of the ship smoke pipe.

[0043] The bolt hole of the lower straight pipe section 3 is designed as a waist-shaped hole, and allows an installation position deviation of ±5 mm.

[0044] The ultrasonic flaw detection mark is arranged at the welding seam between the transition circular pipe 2 and the lower straight pipe section 4.

[0045] The cross section of the annular reinforcing rib is trapezoidal, the height is 10-15 mm, and the interval is 50-80 mm.

[0046] The thread specification of the plug 78 is M20*1.5, and the material is 316L stainless steel.

[0047] The overall material of the device is heat-resistant alloy steel, and the surface is sprayed with an aluminum-silicon anti-oxidation coating.

[0048] The specific embodiments of the present application are described in detail in combination with the drawings as follows:

[0049] As shown in Figs. Figure 1 and Figure 2 The present application is a device for connecting a circular top and a square bottom, which is composed of an upper end circular flange 1, a transition circular pipe 2, a lower straight pipe section 3, a pressure sensor welding seat 5, a temperature sensor welding seat 6 and plugs 7 and 8.

[0050] Structural composition and assembly

[0051] The upper end circular flange 1 is forged by using ASTM A182 F11 heat-resistant steel, the outer diameter is designed as DN400 according to the standard of the flange of the ship smoke pipe, the flange end surface is processed as an annular sealing groove, and the graphite gasket is embedded to enhance the air tightness.

[0052] Transition pipe 2: rolled and welded from steel plate, inner diameter of round end matches with upper end flange 1, angle of taper section is 20°, inner wall is sprayed with 0.5mm thick Al2O3 ceramic layer, resistant to 800℃ high temperature exhaust gas scouring.

[0053] Lower method flange 3: designed as 300x300mm square flange according to the flange specification of exhaust gas outlet of MAN B&W 7S60MC type supercharger, bolt hole adopts Waist-shaped hole, allows ±5mm position adjustment during installation.

[0054] Lower straight pipe section 4: length is 350mm, outer diameter Wall thickness is 12mm, outer surface is welded with 3 rows of trapezoidal reinforcing ribs: height is 12mm, spacing is 60mm, to resist diesel engine vibration load.

[0055] Sensor interface: pressure sensor welding seat 5 is located on the side of transition pipe 2, axis is horizontal; temperature sensor welding seat 6 is located on the side of lower straight pipe section 4, axis is vertically downward; both adopt DN15 socket welding interface, thread specification is M20x1.5, plugs 7,8 are preinstalled at the interface.

[0056] Manufacturing process

[0057] Blanking: blanks of each part are prepared by plasma cutting, bevel is processed as V type 35°;

[0058] Welding: TIG welding is adopted for transition pipe 2, upper end flange 1 and lower method flange 3, interlayer temperature is controlled below 150℃; MAG welding is adopted for lower straight pipe section 4 and lower method flange 3, 100% ultrasonic detection is performed on the weld after welding;

[0059] Heat treatment: overall stress relief annealing is performed at 650℃ for 2 hours;

[0060] Surface treatment: after sand blasting and rust removal, 80μm aluminum-silicon coating is sprayed, and solidification is performed at 450℃ for 1 hour.

[0061] Installation and use

[0062] After positioning of the diesel engine, lower method flange 3 of the device is aligned with the exhaust gas outlet of the supercharger, and M20x120 bolt is used for fastening; upper end flange 1 is connected with the flange of the exhaust pipe, and bolt torque is applied to 450N.m according to ISO 16047 standard. After installation, plugs 7,8 are removed, pressure transmitter and thermocouple are installed, and wiring is connected to the engine room monitoring system. Through real ship test, the device has no leakage under full load working condition, sensor data is stable, spacing between surrounding parts is ≥50mm, and completely meets the design requirements.

[0063] Industrial applicability

[0064] The application can be mass-produced, is suitable for various mainstream models by modifying the size of the upper end flange 1, the lower method flange 2, the length of the lower straight pipe section 4 and the sensor interface position, has been successfully applied to various bulk cargo ships and oil tankers, significantly shortens the installation period of the diesel engine exhaust system and reduces the modification cost.

[0065] The above merely describes the preferred embodiments of the present application, but the protection scope of the present application is not limited thereto, any skilled person in the art, according to the technical solution and the inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, should be covered within the protection scope of the present application.

Claims

1. A device for connecting a round to a flat, characterized in that The application relates to a flange adapter for the exhaust pipe of a low-speed diesel engine supercharger, which comprises the following parts: an upper end circular flange (1) with an outer diameter matched with the circular flange of a ship exhaust pipe; a transition circular pipe (2) welded at one end of the upper end circular flange (1) and gradually tapered into a square section at the other end; a lower end flange (3) with a size matched with the flange of the exhaust pipe of a low-speed diesel engine supercharger and welded at the square end of the transition circular pipe (2); a lower straight pipe section (4) vertically connected at the lower end of the lower end flange (3) and with a length customized according to the space requirement of a cabin; a pressure sensor welding seat (5) arranged on the side wall of the transition circular pipe (2) and used for mounting a pressure sensor; a temperature sensor welding seat (6) arranged on the side wall of the lower straight pipe section (4) and used for mounting a temperature sensor; and at least two plugs threadedly connected to the pressure sensor welding seat (5) and the temperature sensor welding seat (6) respectively and used for plugging or opening the sensor interfaces.

2. A device according to claim 1, wherein: The length of the lower straight pipe section (4) is 200-500 mm, and the outer wall of the lower straight pipe section (4) is provided with annular reinforcing ribs.

3. A device according to claim 2, wherein: The tapering angle of the transition circular pipe (2) is 15-30 degrees, and the inner wall of the transition circular pipe (2) is covered with a high-temperature-resistant ceramic coating.

4. A round-to-flat connection device as claimed in claim 3, characterized in that: The axes of the pressure sensor welding seat (5) and the temperature sensor welding seat (6) are perpendicular to each other, and the distance from the end surface of the lower end flange (3) is not less than 100 mm.

5. A round-to-flat connection device as claimed in claim 4, characterized in that: A graphite sealing gasket is arranged between the upper end circular flange (1) and the flange of the ship exhaust pipe.

6. A round-to-flat connection device as claimed in claim 5, characterized in that: The bolt holes of the lower end flange (3) are designed in a waist shape and allow an installation position deviation of + / - 5 mm.

7. A round-to-flat connection device as claimed in claim 6, characterized in that: An ultrasonic flaw detection mark is arranged at the welding seam between the transition circular pipe (2) and the lower straight pipe section (4).

8. A round-to-flat connection device as claimed in claim 7, characterized in that: The cross section of the annular reinforcing rib is trapezoidal, the height is 10-15 mm, and the interval is 50-80 mm.

9. A round-to-flat connection device as claimed in claim 8, characterized in that: The thread specification of the plug is M20*1.5, and the material is 316L stainless steel.

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