CBV valve reinforcing support
By designing a reinforced bracket for the CBV valve and utilizing a honeycomb-shaped shock-absorbing core and an I-shaped main support arm to absorb vibration energy, the problem of severe vibration of the CBV valve was solved, thereby improving the stability and compatibility of the equipment and extending its lifespan.
Patent Information
- Application Number
- CN202520556098.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-27
- Publication Date
- 2026-02-06
- Estimated Expiration
- 2035-03-27
AI Technical Summary
Existing CBV valves and their connecting pipelines in large, low-speed marine diesel engines experience severe vibrations due to vibration and gas flow impact, leading to loosening of the bolts connecting the valve body and the bracket, weld cracking, and valve body deformation. This affects the equipment's lifespan and safety, and the traditional bracket design has poor compatibility.
A CBV valve reinforcement bracket is designed, which adopts a main support arm and a connecting arm, with an arc transition section embedded with a honeycomb-shaped shock-absorbing core. The elastic material absorbs vibration energy, and combined with the I-shaped main support arm and anti-loosening washers, a rigid-elastic composite support is formed to adapt to the existing structure of the host, reduce the vibration amplitude, and monitor the vibration frequency.
It effectively absorbs vibration energy, reduces vibration amplitude by 40-50%, improves support stability, is easy to install and highly compatible, is suitable for different types of diesel engines, extends equipment life and improves safety.
Smart Images
Figure CN223881258U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The application belongs to the technical field of CBV valves for large low-speed marine diesel engines, and particularly relates to a CBV valve reinforcing support. BACKGROUND
[0002] In a large low-speed marine diesel engine, the CBV valve (scavenge air box bypass valve) is an important component of the high-pressure SCR system (selective catalytic reduction), and its function is to open when the main engine is running at low load, to guide the high-temperature gas in the scavenge air box into the exhaust system to maintain stable exhaust temperature.
[0003] However, in actual operation, the CBV valve of the prior art often vibrates violently due to the periodic impact force generated by the vibration of the main engine and the flow of gas. Long-term vibration not only causes the connecting bolts of the valve body and the support to loosen, but also may cause problems such as weld cracking and valve body deformation, seriously affecting the service life and operational safety of the equipment.
[0004] In the prior art, rigid reinforcement or the addition of a damper is usually used to alleviate vibration. However, rigid reinforcement may cause local fatigue failure due to stress concentration, and the installation of a damper requires additional space and has high maintenance costs. In addition, the traditional support design does not fully consider the adaptability to the existing structure of the main engine, resulting in complex installation or poor compatibility. Therefore, there is an urgent need for a solution that can effectively absorb vibration energy and seamlessly integrate with the existing structure of the main engine to improve the stability of the CBV valve and prolong its service life. SUMMARY
[0005] To solve the problems of the CBV valve and its connecting pipeline of the prior art, such as violent vibration, loosening of the connecting bolts of the valve body and the support, weld cracking, valve body deformation, and serious impact on the service life and operational safety of the equipment, a CBV valve reinforcing support is proposed, which includes a main support arm and a connecting arm. One end of the main support arm is fixed to the main engine structure through existing bolts of the main engine, and the other end is integrally connected to the connecting arm through a circular arc transition section. A honeycomb damping core is embedded in the circular arc transition section. The damping core is made of an elastic material and is used to absorb vibration energy through deformation. The end of the connecting arm is provided with an oblong hole for adapting to the installation tolerance of the CBV valve reinforcing support and connecting through a fastener. The cross section of the main support arm is I-shaped. Anti-loose washers are provided at the connection between the main support arm and the connecting arm and the fastener mounting position.
[0006] According to the CBV valve reinforcing support described above, the material of the honeycomb damping core is nitrile rubber or silicone rubber, the Shore hardness is 50-70A, the honeycomb pore size is 2-5mm, and the porosity is 60-80%.
[0007] According to the CBV valve reinforcing support described above, the curvature radius R of the arc transition section is 20-50mm, the anti-loosening washer is a double spring washer or a nylon locking washer, the installation torque value is 120-150N.m, and the washer is coated with thread fastening glue.
[0008] According to the CBV valve reinforcing support described above, the main support arm has an I-shaped cross section, a thickness of 8-12mm, a flange width of 25-35mm, and a material of low alloy steel with a yield strength of greater than or equal to 345MPa; the web thickness of the I-shaped cross section of the main support arm is 10mm, the flange width is 30mm, the flange end is provided with a chamfer with an angle of 45° and a length of 2-3mm, so as to reduce stress concentration.
[0009] According to the CBV valve reinforcing support described above, a longitudinal reinforcing rib is welded to the outer side of the connecting arm, the reinforcing rib has a height of 5-8mm, a thickness consistent with the plate thickness of the connecting arm, and a spacing of 50-80mm, and the connecting arm and the CBV valve body are connected through an elastic bushing.
[0010] According to the CBV valve reinforcing support described above, the surface of the main support arm is covered with a zinc-nickel alloy corrosion-resistant coating with a thickness of 20-30μm, and a polyurethane damping coating is coated outside the coating with a thickness of 0.3-0.5mm.
[0011] According to the CBV valve reinforcing support described above, the connecting arm has a telescopic structure, including an inner sleeve and an outer sleeve, and the inner sleeve is fixed through an adjusting bolt, and the telescopic adjustment range is ±10mm, so as to adapt to the installation spacing of different main machine models.
[0012] According to the CBV valve reinforcing support described above, the outer side of the arc transition section is provided with a vibration sensor mounting seat, the mounting seat is fixed through a threaded hole to fix a piezoelectric acceleration sensor, and is used for real-time monitoring of the vibration frequency and amplitude of the support.
[0013] According to the CBV valve reinforcing support described above, the main support arm and the connecting arm are integrally formed by laser welding process, the weld is continuous scale welding, the weld leg height is 3-5mm, and the ultrasonic flaw detection is carried out.
[0014] According to the CBV valve reinforcing support described above, the two ends of the oblong hole are provided with countersunk grooves with a depth of 1-2mm for accommodating the head of the fastener to avoid interference with the CBV valve reinforcing support; the whole support is simulated and optimized by UG to match the vibration frequency of the main machine and reduce the risk of resonance.
[0015] The beneficial effects of the present application are as follows:
[0016] 1. The application adopts a circular arc transition structure design, disperses vibration energy through deformation, reduces the impact force transmitted to the valve body, and absorbs vibration energy; the vibration amplitude is reduced by about 40%-50%.
[0017] 2. The application uses the existing bolt of the host and the original through hole of the CBV valve for fixing, without additional hole opening or modification of the host structure, has structural compatibility, convenient installation and strong compatibility.
[0018] 3. The bracket of the application is fixed at both ends to the host bolt and the valve body bracket, forming a rigid-elastic composite support, improving stability, and effectively suppressing the lateral swing and longitudinal resonance of the valve body.
[0019] The application is optimized by UG simulation, suitable for different models of low-speed diesel engines, and has good engineering popularization value. DETAILED DESCRIPTION
[0020] Figure 1 is a structural schematic diagram of a CBV valve reinforcing bracket of the application.
[0021] Figure 2 is a perspective view of a CBV valve reinforcing bracket installation position schematic diagram of the application.
[0022] Figure 3 is a front view of a CBV valve reinforcing bracket installation position schematic diagram of the application.
[0023] In the figure: 1-main support arm, 2-connection arm, 5-existing bolt of host, 3-circular arc transition section, 6-long circular hole, 11-loose washer. DETAILED DESCRIPTION
[0024] Preferred Embodiment
[0025] The technical solutions in the embodiments of the application will be described clearly and completely below in combination with the drawings in the embodiments of the application. Based on the embodiments in the application, all other embodiments obtained by those of ordinary skill in the art without creative labor fall within the scope of protection of the application.
[0026] As Figure 1As shown: in this embodiment, a CBV valve reinforcing bracket, comprising a main support arm 1 and a connecting arm 2, one end of the main support arm 1 is fixed to the main machine structure through the main machine existing bolt 5, the other end is integrally connected with the connecting arm 2 through the circular arc transition section 3; the circular arc transition section 3 is embedded with a honeycomb damping core inside, the damping core is made of elastic material, used to absorb vibration energy by deformation; the end of the connecting arm 2 is provided with a long round hole 6, used to adapt to the installation tolerance of the CBV valve reinforcing bracket and connected through a fastener; the cross section of the main support arm 1 is I-shaped; the connecting part of the main support arm 1 and the connecting arm 2 and the fastener mounting position are all provided with a lock washer 11.
[0027] The material of the honeycomb damping core is nitrile rubber or silicone rubber, its shore hardness is 50-70A, the honeycomb pore size is 2-5mm, and the porosity is 60-80%.
[0028] The curvature radius R of the circular arc transition section 3 is 20-50mm, the lock washer 11 is a double spring washer or a nylon locking washer, the installation torque value is 120-150N•m, and the thread fastening glue is coated.
[0029] The cross section of the main support arm 1 is I-shaped, the thickness is 8-12mm, the flange width is 25-35mm, the material is low alloy steel, and the yield strength is ≥345MPa; the web thickness of the I-shaped cross section of the main support arm 1 is 10mm, the flange width is 30mm, the flange end is provided with a chamfer, the chamfer angle is 45°, and the chamfer length is 2-3mm, so as to reduce stress concentration.
[0030] The outside of the connecting arm 2 is welded with a longitudinal reinforcing rib, the reinforcing rib height is 5-8mm, the thickness is consistent with the plate thickness of the connecting arm 2, the spacing is 50-80mm, and the connecting arm 2 is connected with the CBV valve body through an elastic bushing.
[0031] The surface of the main support arm 1 is covered with a zinc-nickel alloy corrosion-resistant coating, the coating thickness is 20-30μm, and a polyurethane damping paint is coated outside the coating, the thickness is 0.3-0.5mm.
[0032] The connecting arm 2 is a telescopic structure, including an inner sleeve and an outer sleeve, the inner sleeve is fixed through an adjusting bolt, the telescopic adjustment range is ±10mm, so as to adapt to the installation spacing of different main machine models.
[0033] The outside of the circular arc transition section 3 is provided with a vibration sensor mounting seat, the mounting seat is fixed with a piezoelectric acceleration sensor through a threaded hole, used to monitor the vibration frequency and amplitude of the bracket in real time.
[0034] The main support arm 1 and the connecting arm 2 are integrally formed by laser welding process, the weld is continuous scale welding, the weld leg height is 3-5mm, and the ultrasonic flaw detection is detected.
[0035] The long circular hole 6 is provided with a countersunk groove at both ends, with a depth of 1-2 mm, for accommodating the head of the fastener, avoiding interference with the CBV valve reinforcing bracket; the overall bracket is optimized by UG simulation to match the host vibration frequency and reduce the risk of resonance.
[0036] As shown in Figures 1-2 The CBV valve reinforcing bracket is composed of a main support arm 1, a connecting arm 2, and a circular arc transition section 3. The main support arm adopts an I-shaped cross-section, with a web thickness of 10 mm and a material of Q345B low alloy steel, which has high strength and fatigue resistance. The connecting arm 2 has a long circular hole 6 at the end, with a diameter of Φ14 mm x 20 mm, for adapting to the installation tolerance of the CBV valve bracket 4. The circular arc transition section 3 has a radius of curvature R = 30 mm, with a honeycomb nitrile rubber damping core 10 embedded inside, which can absorb high-frequency vibration energy when deformed.
[0037] The installation steps of the present embodiment include:
[0038] S1: Pretreatment: Clean the existing bolt 5 of the host and the surface of the CBV valve reinforcing bracket to ensure the smoothness of the contact surface.
[0039] S2: Fix the main support arm 1: Insert the installation end of the main support arm 1 into the existing bolt 5 of the host, and use the lock washer 11 and nut to preliminarily tighten, with a torque value of 120-150 N·m.
[0040] S3: Connect the CBV valve reinforcing bracket: Align the long circular hole 6 of the connecting arm 2 with the long circular hole 6 of the CBV valve bracket, insert the flange bolt, and add an elastic bushing to reduce the rigid contact.
[0041] S4: Adjustment and locking: Fine-tune the bracket position through the long circular hole 6 to ensure that the main support arm 1 and the connecting arm 2 are in the same stress plane, and finally lock all the bolts to the specified torque.
[0042] Damping principle
[0043] Vibration energy is transmitted to the circular arc transition section 3 through the main support arm 1, and the honeycomb damping core inside it converts mechanical energy into heat energy through elastic deformation, reducing the amplitude. At the same time, the main support arm with an I-shaped cross-section suppresses low-frequency vibration through the web bending resistance, and the elastic bushing further isolates the high-frequency vibration transmission path.
[0044] Maintenance and optimization
[0045] Check the status of the lock washer 11 and the integrity of the damping coating regularly, and apply a new coating every 5000 hours. If higher vibration conditions are required, the honeycomb core material can be replaced with silicone rubber, which has a temperature resistance of -60°C to 250°C, to improve performance.
[0046] After the bracket is installed on the MAN B&W 6S50ME-C9.2 low-speed diesel engine, the vibration speed of the CBV valve measured by using an acceleration sensor is reduced from 12.5 mm / s to 6.8 mm / s, and the reduction amplitude reaches 45%. After 2000 hours of continuous operation, no bolt loosening or bracket cracking is found, verifying the reliability and durability thereof.
[0047] The above merely describes a preferred specific embodiment 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 scheme and inventive concept of the present application, makes equivalent replacement or change within the technical range disclosed by the present application, which should be covered within the protection scope of the present application.
Claims
1. A CBV valve reinforcement stent characterized by, The main support arm (1) and the connecting arm (2) are provided, one end of the main support arm (1) is fixed to the main machine structure through the main machine bolt (5), the other end is integrally connected with the connecting arm (2) through the arc transition section (3), the arc transition section (3) is embedded with a honeycomb damping core, the damping core is made of elastic material and is used for absorbing vibration energy through deformation, the end of the connecting arm (2) is provided with an oblong hole (6) for adapting the mounting tolerance of the CBV valve reinforcing support and being connected through a fastener, the cross section of the main support arm (1) is I-shaped, and the connecting part of the main support arm (1) and the connecting arm (2) and the fastener mounting position are provided with a lock washer (11).
2. The CBV valve reinforcement stent of claim 1, wherein: The material of the honeycomb damping core is nitrile rubber or silicone rubber, the Shore hardness is 50-70A, the honeycomb pore size is 2-5mm, and the porosity is 60-80%.
3. A CBV valve reinforcement stent according to claim 2, wherein: The curvature radius R of the arc transition section (3) is 20-50mm, the lock washer (11) is a double spring washer or a nylon locking washer, the installation torque value is 120-150N·m, and the lock washer is coated with a thread fastening glue.
4. A CBV valve reinforcement stent according to claim 3, wherein: The cross section of the main support arm (1) is I-shaped, the thickness is 8-12mm, the flange width is 25-35mm, the material is low alloy steel, and the yield strength is greater than or equal to 345MPa, the web thickness of the I-shaped cross section of the main support arm (1) is 10mm, the flange width is 30mm, the flange end is provided with a chamfer, the chamfer angle is 45°, and the chamfer length is 2-3mm.
5. A CBV valve reinforcement stent according to claim 4, wherein: The outer side of the connecting arm (2) is welded with a longitudinal reinforcing rib, the reinforcing rib height is 5-8mm, the thickness is consistent with the plate thickness of the connecting arm (2), the interval is 50-80mm, and the connecting arm (2) is connected with the CBV valve body through an elastic bushing.
6. A CBV valve reinforcement stent according to claim 5, wherein: The surface of the main support arm (1) is covered with a zinc-nickel alloy corrosion-resistant coating, the coating thickness is 20-30μm, and a polyurethane damping coating is coated outside the coating, and the thickness is 0.3-0.5mm.
7. A CBV valve reinforcement stent according to claim 6, wherein: The connecting arm (2) is a telescopic structure, including an inner sleeve and an outer sleeve, the inner sleeve is fixed through an adjusting bolt, and the telescopic adjustment range is ±10mm.
8. A CBV valve reinforcement stent according to claim 7, wherein: The outer side of the arc transition section (3) is provided with a vibration sensor mounting seat, and the piezoelectric acceleration sensor is fixed through the threaded hole of the mounting seat.
9. A CBV valve reinforcement stent according to claim 8, wherein: The main support arm (1) and the connecting arm (2) are integrally formed by laser welding process, the welding seam is continuous scale welding, and the welding leg height is 3-5mm.
10. A CBV valve reinforcement stent according to claim 9, wherein: The two ends of the oblong hole (6) are provided with countersunk grooves, the countersunk depth is 1-2mm, the countersunk grooves are used for accommodating the head of the fastener, and interference with the CBV valve reinforcing support is avoided.