Pneumatic muffler valve for ptc

Abstract

The utility model discloses a pneumatic silencing valve for PCTC, including silencer casing and air brake casing, the outside fixed support platform of silencer casing, the middle part rotationally connected with the main shaft of air brake casing, the rotationally connected with four driven shafts in air brake casing, every two driven shafts equidistance distribution are in the both sides of main shaft, and the air brake blade is fixed with in the outside of main shaft and driven shaft, and the end part that extends to the outside of air brake casing is fixed with crank no.1 in the main shaft and the driven shaft of being in the first, third position, and the end part that extends to the outside of air brake casing is fixed with crank no.2 in the driven shaft of being in the second, fourth position, and one side of air brake casing is provided with connecting rod no.1, connecting rod no.2 and connecting rod no.3. Air brake adopts two -way alternate open -close blade group, and five -piece blade group is driven by the main shaft, and the odd -numbered blade and even -numbered blade form reverse rotation mechanism, and the concentrated eddy current that alternately opens and shuts mode effectively avoids the traditional same -direction opening and closing, and reduces local turbulent energy loss.

Description

Technical Field

[0001] This utility model relates to the field of marine engineering technology, and in particular to a pneumatic silencer valve for PCTC. Background Technology

[0002] PCTC, short for Pure Car and Truck Carrier, is a specialized vessel designed specifically for transporting cars, trucks, and other roll-on / roll-off cargo. PCTC pneumatic silencers are primarily used in PCTC ventilation systems in areas requiring airflow control and fire isolation, such as fan inlet / outlet areas, cabin ventilation terminals, critical ductwork nodes, and ventilation ducts penetrating fire-resistant partitions. The main function of a silencer is noise reduction; it converts sound energy into heat energy through special structural designs (such as porous sound-absorbing materials and sound-absorbing sheets), reducing noise propagation. Air dampers primarily function for airflow control and fire isolation. They automatically close in case of fire (within 60 seconds according to national standards), forming a physical barrier to block flames and high-temperature smoke; under normal circumstances, they are used to regulate airflow distribution. In addition to basic noise reduction and fire protection functions, both serve the ship's "system safety and compliance": meeting the International Maritime Organization (IMO) noise regulations (such as IMO A.468 standard) and the fire protection requirements of the SOLAS Convention, and avoiding the risk of PSC / FSC detention due to substandard noise or fire protection facilities.

[0003] In some scenarios, the PCTC pneumatic silencer valve automatically adjusts the airflow according to the engine's operating status. When the engine is idling or at low speed, the valve will maintain a small opening to reduce the gas flow; while when the engine is running at high speed, the valve will increase the opening to increase the gas flow. However, the existing PCTC pneumatic silencer valve has the following defects in use: (1) Split design defects: The traditional silencer and air damper are installed separately, which leads to increased turbulent noise at the pipeline connection; (2) Low airflow control efficiency: The conventional equidistant air damper blades generate airflow loss, and the multiple air damper blades rotate in the same direction, which easily generates concentrated vortices; (3) Secondary noise source: The existing single-layer perforated plate generates high-frequency whistling under high-speed airflow. Utility Model Content

[0004] In view of this, the purpose of this utility model is to propose a pneumatic silencer valve for PCTC. The technical problems to be solved are: (1) the defect of split design: the traditional silencer and the damper are installed separately, which leads to increased turbulent noise at the pipeline connection; (2) low airflow control efficiency: conventional equidistant damper blades generate airflow loss, and multiple damper blades rotate in the same direction, which easily generates concentrated vortices; (3) secondary noise source: existing single-layer perforated plates generate high-frequency howling under high-speed airflow.

[0005] To achieve the above technical objectives, this utility model provides a pneumatic silencer valve for PCTC:

[0006] It includes a muffler housing and a damper housing. A support platform is fixed to the outside of the muffler housing. A main shaft is rotatably connected to the middle of the damper housing. Four driven shafts are rotatably connected inside the damper housing. Every two driven shafts are equally spaced on both sides of the main shaft. Damper blades are fixed to the outside of the main shaft and the driven shafts. Crank 1 is fixed to the end of the main shaft and the driven shafts in the first and third positions extending outside the damper housing. Crank 2 is fixed to the end of the driven shafts in the second and fourth positions extending outside the damper housing. Connecting rod 1, connecting rod 2 and connecting rod 3 are provided on one side of the damper housing. Crank 1 and connecting rod 1 are hinged together. Crank 2 and connecting rod 2 are hinged together. The two ends of connecting rod 3 are respectively hinged to connecting rod 1 and connecting rod 2.

[0007] Preferably, a perforated plate is fixed inside the muffler housing, and sound-absorbing cotton is filled between the muffler housing and the perforated plate.

[0008] Preferably, the top and bottom of the silencer housing are both fixed with silencer flanges, and the top and bottom of the damper housing are both fixed with damper flanges. The silencer flange at the bottom of the silencer housing and the damper flange at the top of the damper housing are fixed with bolts.

[0009] Preferably, a plurality of brass bushings are fixed inside the damper housing, and both ends of the main shaft and the driven shaft pass through the corresponding brass bushings and rotate within the brass bushings.

[0010] Preferably, the perforated plate has a hole diameter of two millimeters and a hole spacing of five millimeters.

[0011] Preferably, limit baffles are fixed on both inner walls of the airlock housing.

[0012] Preferably, the top and bottom of the silencer housing are fixed with silencer flanges, and the top and bottom of the damper housing are fixed with carbon steel plates. The silencer flange at the bottom of the silencer housing and the carbon steel plate at the top of the damper housing are fixed by welding.

[0013] As can be seen from the above technical solutions, this application has the following beneficial effects:

[0014] 1. The windshield adopts a bidirectional alternating opening and closing blade assembly, a five-blade assembly driven by the main shaft. The odd-numbered blades and even-numbered blades form an opposing rotation mechanism. The alternating opening and closing method effectively avoids the concentrated vortex generated by the traditional unidirectional opening and closing, and reduces local turbulent energy loss.

[0015] 2: The device has an optimized structure, which is an integrated silencer-air damper structure. The duct connection structure in the traditional silencer-air duct-air damper is eliminated, which shortens the axial dimension and reduces the installation space requirement. The noise reduction effect is significantly improved by the composite noise reduction structure design of perforated plate and sound-absorbing cotton. 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 embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0017] Figure 1 A schematic diagram of the structure of a pneumatic silencer valve for PCTC provided by this utility model;

[0018] Figure 2 A cross-sectional structural schematic diagram of a pneumatic silencer valve for PCTC provided by this utility model;

[0019] Figure 3 A cross-sectional structural schematic diagram of a pneumatic silencer valve for PCTC provided by this utility model;

[0020] Figure 4 A schematic diagram showing the disassembled structure of a pneumatic silencer valve for PCTC provided by this utility model;

[0021] Figure 5 A schematic diagram of the structure of the damper housing provided by this utility model;

[0022] Figure 6 A schematic diagram of the structure of the damper blade provided by this utility model;

[0023] Figure 7 A schematic diagram illustrating the reverse rotation process of the two sets of damper blades provided by this utility model;

[0024] Figure 8 A schematic diagram illustrating the reverse rotation process of the two sets of damper blades provided by this utility model;

[0025] Figure 9 A schematic diagram illustrating the reverse rotation process of the two sets of damper blades provided by this utility model;

[0026] Figure 10 A schematic diagram illustrating the reverse rotation process of the two sets of damper blades provided by this utility model.

[0027] Figure descriptions: 1. Silencer housing; 2. Support platform; 3. Air damper housing; 41. Crank 1; 42. Crank 2; 51. Connecting rod 1; 52. Connecting rod 2; 53. Connecting rod 3; 6. Air damper flange; 7. Silencer flange; 8. Mesh plate; 9. Air damper blade; 10. Main shaft; 11. Driven shaft; 12. Sound-absorbing cotton; 13. Brass bushing; 14. Limiting baffle. Detailed Implementation

[0028] The following description is exemplary in nature and is not intended to limit the scope, application, or use of this disclosure. It should be understood that in all these figures, the same or similar reference numerals indicate the same or similar parts and features. The figures are merely schematic representations of the concept and principles of embodiments of this disclosure and do not necessarily show the specific dimensions and scale of the various embodiments of this disclosure. Certain details or structures of embodiments of this disclosure may be exaggerated in particular portions of certain figures.

[0029] Reference Figure 1-10 :

[0030] In one embodiment of this utility model, a pneumatic silencer valve for PCTC is provided, including a silencer housing 1 and a damper housing 3. A support platform 2 is fixed to the outer side of the silencer housing 1. A main shaft 10 is rotatably connected to the middle of the damper housing 3. Four driven shafts 11 are rotatably connected inside the damper housing 3. Every two driven shafts 11 are equally spaced on both sides of the main shaft 10. Damper blades 9 are fixed to the outer sides of both the main shaft 10 and the driven shafts 11. The main shaft 10 and the driven shafts 11 are connected to the first and second driven shafts 11. Crank 1 41 is fixed to the end of the driven shaft 11 in the third position extending to the outside of the damper housing 3. Crank 2 42 is fixed to the end of the driven shaft 11 in the second and fourth positions extending to the outside of the damper housing 3. Connecting rod 1 51, connecting rod 2 52 and connecting rod 3 53 are provided on one side of the damper housing 3. Crank 1 41 and connecting rod 1 51 are hinged together. Crank 2 42 and connecting rod 2 52 are hinged together. The two ends of connecting rod 3 53 are respectively hinged to connecting rod 1 51 and connecting rod 2 52.

[0031] The silencer housing 1 is fixed with silencer flanges 7 at the top and bottom, and the damper housing 3 is fixed with damper flanges 6 at the top and bottom. The silencer flanges 7 at the bottom of the silencer housing 1 and the damper flanges 6 at the top of the damper housing 3 are fixed with bolts.

[0032] It should be noted that in some other embodiments, the top and bottom of the muffler housing 1 are fixed with muffler flanges 7, and the top and bottom of the damper housing 3 are fixed with carbon steel plates (at the position of damper flange 6). The muffler flange 7 at the bottom of the muffler housing 1 and the carbon steel plate at the top of the damper housing 3 (at the position of damper flange 6) are fixed by welding.

[0033] It should be noted that the structure in this embodiment is optimized. The optimized structure is an integrated silencer-air damper structure, which eliminates the air duct connection structure in the traditional silencer-air duct-air damper, thereby shortening the axial dimension and reducing the installation space requirement.

[0034] In addition, a perforated plate 8 is fixed inside the muffler housing 1, and sound-absorbing cotton 12 is filled between the muffler housing 1 and the perforated plate 8. Multiple brass bushings 13 are fixed inside the damper housing 3. Both ends of the main shaft 10 and the driven shaft 11 pass through the corresponding brass bushings 13 and rotate inside the brass bushings 13.

[0035] It should be noted that the composite noise reduction structure design of perforated plate 8 and sound-absorbing cotton 12 significantly improves the noise reduction effect. The opening ratio of perforated plate 8 can be adjusted within the range of 45-50%. The brass bushing has a wall thickness of 10mm and an oil content of ≥15%. The brass bushing can be replaced with bronze material with MoS2 coating.

[0036] In addition, the mesh plate 8 has a hole diameter of two millimeters and a hole spacing of five millimeters, and limit baffles 14 are fixed on both sides of the inner wall of the wind gate housing 3.

[0037] In use, the rotation angle of the main shaft 10 is controlled by an external rotary cylinder, according to... Figures 7-10 As shown, the damper employs a bidirectional alternating opening and closing blade assembly, a five-blade assembly driven by the main shaft 10. Odd-numbered blades and even-numbered blades form a counter-rotating mechanism, specifically: I. Counter-clockwise rotation assembly: When the main shaft 10 rotates counter-clockwise, it drives the crank 41 on the main shaft 10 to rotate counter-clockwise, thereby driving the damper blades 9 on the main shaft 10 to rotate counter-clockwise. When the crank 41 on the main shaft 10 rotates counter-clockwise, it drives the connecting rod 51 to move. When the connecting rod 51 moves, it drives the other cranks 41 to rotate counter-clockwise. When the other cranks 41 rotate counter-clockwise, they drive the damper blades 9 on the driven shaft 11 in the first and third positions to rotate counter-clockwise. 2. Clockwise Rotation Group: When connecting rod 1 51 moves, it drives connecting rod 3 53 to rotate. When connecting rod 3 53 rotates, it drives connecting rod 2 52 to move. At this time, the direction of movement of connecting rod 2 52 is opposite to that of connecting rod 1 51. When connecting rod 2 52 moves, it drives crank 2 42 to rotate. That is, crank 2 42 rotates clockwise at this time, thereby driving the windshield blades 9 on the driven shaft 11 in the second and fourth positions to rotate clockwise. The alternating opening and closing method effectively avoids the concentrated vortex generated by the traditional unidirectional opening and closing, and reduces the local turbulent energy loss. In addition, the setting of the limiting baffle 14 restricts the position of the blades and also compensates for the gap between the blades and the inner wall of the shell, enhancing the sealing performance.

[0038] The exemplary implementation of the solution proposed in this disclosure has been described in detail above with reference to preferred embodiments. However, those skilled in the art will understand that various modifications and alterations can be made to the above specific embodiments without departing from the spirit of this disclosure, and various combinations can be made to the various technical features and structures proposed in this disclosure without exceeding the protection scope of this disclosure, which is determined by the appended claims.

Claims

1. A pneumatic silencer valve for PCTC, comprising a silencer housing (1) and a damper housing (3), characterized in that, A support platform (2) is fixed to the outside of the silencer housing (1). A main shaft (10) is rotatably connected to the middle of the damper housing (3). Four driven shafts (11) are rotatably connected inside the damper housing (3). Every two driven shafts (11) are equally spaced on both sides of the main shaft (10). Damper blades (9) are fixed to the outside of both the main shaft (10) and the driven shafts (11). The main shaft (10) and the driven shafts (11) in the first and third positions extend to the ends outside the damper housing (3). Each is fixed with a crank one (41), and the driven shaft (11) in the second and fourth positions extends to the end of the windshield housing (3) and is fixed with a crank two (42). The windshield housing (3) is provided with a connecting rod one (51), a connecting rod two (52) and a connecting rod three (53) on one side. The crank one (41) and the connecting rod one (51) are hinged together, the crank two (42) and the connecting rod two (52) are hinged together, and the two ends of the connecting rod three (53) are respectively hinged to the connecting rod one (51) and the connecting rod two (52).

2. The pneumatic silencer valve for PCTC according to claim 1, characterized in that, A perforated plate (8) is fixed inside the muffler housing (1), and sound-absorbing cotton (12) is filled between the muffler housing (1) and the perforated plate (8).

3. A pneumatic silencer valve for PCTC according to claim 1, characterized in that, The silencer housing (1) is fixed with silencer flanges (7) at the top and bottom, and the damper housing (3) is fixed with damper flanges (6) at the top and bottom. The silencer flanges (7) at the bottom of the silencer housing (1) and the damper flanges (6) at the top of the damper housing (3) are fixed with bolts.

4. A pneumatic silencer valve for PCTC according to claim 1, characterized in that, Multiple brass bushings (13) are fixed inside the airlock housing (3). Both ends of the main shaft (10) and driven shaft (11) pass through the corresponding brass bushings (13) and rotate inside the brass bushings (13).

5. A pneumatic silencer valve for PCTC according to claim 2, characterized in that, The perforated plate (8) has a hole diameter of two millimeters and a hole spacing of five millimeters.

6. A pneumatic silencer valve for PCTC according to claim 1, characterized in that, Limiting baffles (14) are fixed on both sides of the inner wall of the airlock housing (3).

7. A pneumatic silencer valve for PCTC according to claim 1, characterized in that, The silencer housing (1) is fixed with silencer flanges (7) at the top and bottom, and the windshield housing (3) is fixed with carbon steel plates at the top and bottom. The silencer flanges (7) at the bottom of the silencer housing (1) and the carbon steel plates at the top of the windshield housing (3) are fixed by welding.

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