A dynamic pressure opening bypass device for a ship intake system

Abstract

The application belongs to the technical field of ship air intake system, and particularly relates to a dynamic pressure opening bypass device of a ship air intake system, which comprises a mounting base with a pressure relief cavity, and a dynamic pressure plate is arranged in the pressure relief cavity; a plurality of air cylinders for driving the dynamic pressure plate in the axial direction are uniformly arranged on the circumference of one end of the pressure relief cavity, and a pressure relief port communicating with the air intake system is arranged at the other end of the pressure relief cavity; the dynamic pressure plate and the pressure relief port adopt plane sealing abutment; spring seats A fixed on the dynamic pressure plate are symmetrically arranged on the two sides of the air cylinder, and springs are sleeved on the spring seats A; the spring seats A slide through the mounting base; the dynamic pressure plate is used for opening and closing the pressure relief port, and the pressure relief cavity is used for supplying gas to the gas turbine. Thus, emergency gas supply to the gas turbine can be realized when the air intake system is blocked, and the power safety of the ship is ensured.

Description

Technical Field

[0001] This invention belongs to the technical field of ship air intake systems, and specifically relates to a dynamic pressure opening bypass device for ship air intake systems. Background Technology

[0002] With the development of marine applications for gas turbines, a complete air intake system is needed to adapt to the marine environment and filter the intake air at the front of the gas turbine. However, with long-term navigation and use, the air intake system will face airflow blockage, intake duct contamination, and increased pressure differential leading to insufficient air intake to the gas turbine, affecting the gas turbine's operating efficiency and, in severe cases, causing power system failure.

[0003] Therefore, it is urgent to install a bypass device when the pressure difference of the air intake system reaches a certain level, to guide the blocked airflow and increase the flow area, thereby solving the problem of insufficient air intake during sudden voyages at sea and ensuring the safety of ship power. Summary of the Invention

[0004] This invention provides a dynamic pressure opening bypass device for a ship's air intake system, comprising a mounting base with a pressure relief chamber, wherein a dynamic pressure plate is provided within the pressure relief chamber; a plurality of cylinders for axially driving the dynamic pressure plate are evenly distributed around one end of the pressure relief chamber, and a pressure relief port communicating with the air intake system is provided at the other end; the dynamic pressure plate and the pressure relief port are sealed together by a planar seal; spring seats A are symmetrically provided on both sides of the cylinders and fixed to the dynamic pressure plate, and springs are sleeved on the spring seats A; the spring seats A slide through the mounting base; the dynamic pressure plate is used to open and close the pressure relief port, and the pressure relief chamber is used to supply gas to the gas turbine.

[0005] Furthermore, the mounting base includes a grooved housing; the bottom of the grooved housing is provided with a flange for connecting to the air intake system, and the top is bolted with a fixing seat; the pressure relief port is located at the bottom of the grooved housing.

[0006] Furthermore, the cylinder is a double-acting cylinder.

[0007] Furthermore, the fixing base includes a fixing plate, on which a sleeve matching the position of the cylinder is provided; the fixing plate is fixed to the top of the groove-shaped housing by a plurality of fastening screws A; the sleeve communicates with the pressure relief chamber; the cylinder body of the cylinder is coaxially fixed inside the sleeve.

[0008] Furthermore, the outer end of the cylinder is provided with a cylindrical seat through which the cylinder rod passes. The cylindrical seat is coaxially embedded in the sleeve and fixed to the sleeve by a number of fastening screws B.

[0009] Further, the dynamic pressure plate is provided with a connecting assembly corresponding to the position of the air cylinder; the connecting assembly comprises a limiting block and a pin; the limiting block is internally provided with a T-shaped through slot, and the limiting block is fixed on the dynamic pressure plate; the pin is located in the T-shaped through slot and is used for pulling or tightly pressing the limiting block; and the limiting block is bolted and fixed at the air rod end of the air cylinder.

[0010] Further, the dynamic pressure plate is provided with a connecting assembly corresponding to the position of the air cylinder; the connecting assembly comprises a limiting block and a pin; the limiting block is internally provided with a T-shaped through slot, and the limiting block is fixed on the dynamic pressure plate; the pin is located in the T-shaped through slot and is used for pulling or tightly pressing the limiting block; and the limiting block is bolted and fixed at the air rod end of the air cylinder.

[0011] Further, the middle of the dynamic pressure plate is provided with a spring seat B, and a spring is sleeved on the spring seat B; the spring seat B slides through the mounting seat; and the plurality of air cylinders are uniformly distributed relative to the center circumference of the spring seat B.

[0012] Further, the pressure difference of the two ends of the dynamic pressure plate is P, the area of the pressure relief port is S, the number of the springs is n, the spring force coefficient of the spring is k, and the original compression amount of the spring is x; the x=(P*S) / (n*k).

[0013] Further, the plurality of air cylinders are communicated with a three-position five-way electromagnetic valve.

[0014] Further, the three-position five-way electromagnetic valve is a middle relief type three-position five-way electromagnetic valve.

[0015] The beneficial effects brought by the present application are as follows:

[0016] When the air intake system is blocked, the movement of the dynamic pressure plate is switched between automatic control and remote control under the working action of the spring and the air cylinder, so that the air intake system can supply emergency gas to the gas turbine through the pressure relief port and the pressure relief cavity, and the power safety of the ship is ensured. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 Fig. 1 is a sectional structure schematic view of a ship air intake system dynamic pressure opening bypass device according to an embodiment of the present application;

[0018] Figure 2 Fig. 2 is a schematic view of the connection of the air cylinder. Figure 1 Fig. 3 is a schematic view of the connection of the air cylinder.

[0019] In the figure, 1 is a flange; 2 is a dynamic pressure plate; 3 is a spring; 4 is a limiting block; 5 is a pin; 6 is a fastening screw B; 7 is an air cylinder; 8 is a fixed seat; and 9 is a fastening screw A. DETAILED DESCRIPTION

[0020] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative work fall within the scope of the present application.

[0021] Embodiment

[0022] As shown in Figure 1 and Figure 2 , the present application provides a dynamic pressure opening bypass device of a ship air intake system, comprising a mounting seat with a pressure relief chamber, wherein a dynamic pressure plate 2 is arranged in the pressure relief chamber; a plurality of air cylinders 7 for driving the dynamic pressure plate 2 in the axial direction are arranged at one end of the pressure relief chamber in a circumferential direction, so as to ensure that the dynamic pressure plate 2 is uniformly stressed; and a pressure relief port communicating with the air intake system is arranged at the other end of the pressure relief chamber; spring seats A fixed on the dynamic pressure plate 2 are symmetrically arranged on both sides of the air cylinder 7; and springs 3 are sleeved on the spring seats A; and the spring seats A slide through the mounting seat.

[0023] The through-flow area of the air intake system is increased through the pressure relief port; the opening and closing of the pressure relief port by the dynamic pressure plate 2 are realized through the air cylinder 7; the dynamic pressure plate 2 is pressed and sealed at the pressure relief port through the spring 3, which can assist the air cylinder 7; when the air pressure difference occurs at both ends of the dynamic pressure plate 2, the pressure relief port is opened, air flows from the air intake system to the pressure relief chamber and then to the gas turbine for emergency air supply, thereby ensuring the safety of the ship power.

[0024] The mounting seat can comprise a groove-shaped shell, the bottom of the groove-shaped shell is provided with a flange 1 for connecting the air intake system; and a fixing seat 8 is bolted at the top of the groove-shaped shell; and the pressure relief port is arranged at the bottom of the groove-shaped shell. When the dynamic pressure plate 2 is opened, air flows out from both ends of the groove-shaped shell and supplies air to the gas turbine. As shown in Figure 1 , the left end of the groove-shaped shell is the top, and the right end is the bottom, which will not be described in detail.

[0025] The air cylinder 7 is preferably a double-acting air cylinder, which improves the load capacity of the air cylinder 7 and further ensures the stability of the whole, so as to enable the dynamic pressure plate 2 to quickly open and close the pressure relief port, and further improve the power safety of the ship. Specifically, the fixing seat 8 comprises a fixing plate, the fixing plate is provided with a sleeve matched with the position of the air cylinder 7; the fixing plate is fixed at the top of the groove-shaped shell through a plurality of fastening screws A9; the sleeve communicates with the pressure relief chamber; the air cylinder 7 is located in the sleeve, and the cylinder body of the air cylinder 7 is coaxially fixed on the sleeve. A cylindrical seat through which a gas rod can pass can also be arranged at the outer end of the air cylinder 7, the cylindrical seat is coaxially embedded in the sleeve and is bolted and fixed on the sleeve through a plurality of fastening screws B6, so as to ensure the stability of the installation position of the air cylinder 7.

[0026] The double-acting cylinder here is a purchased component, mainly including a cylinder body and a gas rod, and the gas rod is provided with a piston, which moves in the cylinder body to drive the gas rod to move in two directions, and details are not described herein.

[0027] As an embodiment of the present application, in the case of selecting a double-acting cylinder for the cylinder 7, a connecting assembly corresponding to the position of the cylinder 7 is arranged on the dynamic pressure plate 2; the connecting assembly includes a limiting block 4 and a pin 5; the limiting block 4 is provided with a T-shaped through slot, and is fixed on the dynamic pressure plate 2; the pin 5 is located in the T-shaped through slot and is used to pull or tightly press the limiting block 4, that is, the pin 5 can move axially in the T-shaped through slot under the driving of the cylinder 7; the limiting block 4 is bolted and fixed at the end of the gas rod of the cylinder 7; and the whole is convenient to install and use.

[0028] When the intake system is blocked, the pressure at the front end of the dynamic pressure plate 2 will increase, and when the pressure is greater than the closing force generated by the spring 3 at the rear end of the dynamic pressure plate 2, the dynamic pressure plate 2 is separated from the pressure relief port to form a gas flow passage, so that the overall pressure drop of the intake system is ensured, and the intake effect of the gas turbine is ensured. According to different requirements of the power core intake amount and the intake pressure difference, the size of the opening force can be changed by replacing the spring 3, so as to match the limit pressure difference value of the intake system, and when the limit pressure difference value is exceeded in the intake system, the dynamic pressure opening of the present application is opened.

[0029] Correspondingly, when the cleanliness of the intake is emphasized or other needs are required, a three-position five-way electromagnetic valve is used to control the cylinder 7 to drive the pin 5 to tightly press the limiting block, so that the dynamic pressure plate is in a normally closed state. In the normally closed state, the gas flow cannot pass through the dynamic pressure opening bypass device. In addition, the middle of the dynamic pressure plate 2 can be provided with a spring seat B, and the spring seat B is sleeved with a spring 3; the spring seat B slides through the mounting seat; a plurality of cylinders 7 are uniformly distributed relative to the center circumference of the spring seat B, further ensuring that the dynamic pressure plate 2 is uniformly stressed.

[0030] When selecting the specification of the spring 3, the formula x=(P×S) / (n×k) can be used for selection. Wherein, P is the pressure difference between the two ends of the dynamic pressure plate 2, S is the area of the pressure relief port, n is the number of the spring 3, and k is the spring force coefficient of the spring 3, and details are not described herein.

[0031] When the above connecting assembly is used, there are two modes of automatic control and remote control. In the automatic control mode, personnel operation is not required. Through the dynamic pressure effect, when the pressure difference between the front and rear ends of the dynamic pressure plate 2 reaches the set value, the dynamic pressure plate 2 will automatically open, increase the gas flow passage, and ensure that the intake system supplies emergency gas to the gas turbine through the pressure relief port and the pressure relief cavity. The pressure difference set value can be realized by replacing the spring 3 on the dynamic pressure plate 2 according to different working conditions.

[0032] When the pressure difference between the front and back ends of the dynamic pressure plate 2 is lower than the set value, the force generated by the dynamic pressure effect is smaller than the elastic force of the spring 3, and under the action of the elastic force, the dynamic pressure plate 2 is tightly pressed against the pressure relief port, the airflow passage disappears, and the bypass device is automatically closed. In the automatic mode, the dynamic pressure is used to open the bypass device, which can realize the bypass function after the intake system is blocked in real time without other control components and computers, thereby greatly saving resources.

[0033] In the remote control mode, to meet the demand for keeping the dynamic pressure opening bypass device in the normally open or normally closed state, a three-position five-way electromagnetic valve is used to control the front end of the air cylinder 7 to tightly press the limiting block 4 on the dynamic pressure plate 2 through the pin 5, so that the dynamic pressure plate 2 cannot be opened by the dynamic pressure effect, and the dynamic pressure plate 2 is kept closed. After the air cylinder 7 is reversed, the pin 5 pulls the limiting block 4, so that the dynamic pressure plate 2 is separated from the pressure relief port, and the normally open state is realized. In the normally open state, the airflow passage remains unobstructed.

[0034] Here, the three-position five-way electromagnetic valve preferably uses a middle leakage type three-position five-way electromagnetic valve, and correspondingly, the air cylinder 7 uses a bidirectional air cylinder. After using the remote control method, the piston stroke of the air cylinder 7 needs to be adjusted to the middle position through the three-position five-way electromagnetic valve. The middle leakage type three-position five-way electromagnetic valve can perform air cylinder pressure relief when the stroke of the air cylinder 7 is in the middle position. After pressure relief, the limiting function of the air cylinder 7 is invalid, and the dynamic pressure plate 2 can normally open according to the change of the pressure at the front and back ends. The dynamic pressure opening bypass device of the ship intake system enters the automatic control mode.

[0035] The above is the preferred embodiment of the present application, and it should be pointed out that for ordinary skilled persons in the technical field, some improvements and refinements can be made without departing from the principles of the present application, and these improvements and refinements should also be considered as the protection scope of the present application.

Claims

1. A dynamic pressure bypass device for a ship's air intake system, characterized in that, The device includes a mounting base with a pressure relief chamber, the pressure relief chamber containing a dynamic pressure plate (2); one end of the pressure relief chamber is circumferentially distributed with several cylinders (7) for axially driving the dynamic pressure plate (2), and the other end is provided with a pressure relief port connected to the air intake system; the dynamic pressure plate (2) and the pressure relief port are sealed together by a planar seal; spring seats A are symmetrically provided on both sides of the cylinders (7) and fixed on the dynamic pressure plate (2), and springs (3) are sleeved on the spring seats A; the spring seats A slide through the mounting base; the dynamic pressure plate (2) is used to open and close the pressure relief port, and the pressure relief chamber is used to supply gas to the gas turbine; In remote control mode, the locking pin (5) at the front end of the cylinder (7) is pressed against the limit block (4) on the dynamic pressure plate (2) by the three-position five-way solenoid valve, so that the dynamic pressure plate (2) cannot be opened by the dynamic pressure effect, and the dynamic pressure plate (2) is normally closed; after the cylinder (7) is reversed, the locking pin (5) pulls the limit block (4), so that the dynamic pressure plate (2) is disengaged from the pressure relief port and is normally open; In automatic control mode, the piston stroke of cylinder (7) is adjusted to the middle position by a three-position five-way solenoid valve to depressurize the cylinder. After depressurization, the limiting function of cylinder (7) fails, and the dynamic pressure plate (2) can normally open according to the change of air pressure at both ends. The cylinder (7) is a double-acting cylinder, and several cylinders (7) are connected to a three-position five-way solenoid valve; The dynamic pressure plate (2) is provided with a connecting component corresponding to the position of the cylinder (7); the connecting component includes a limiting block (4) and a locking pin (5); the limiting block (4) is provided with a T-shaped through groove, and the limiting block (4) is fixed on the dynamic pressure plate (2); the locking pin (5) is located in the T-shaped through groove and is used to pull or press the limiting block (4); the limiting block (4) is bolted to the end of the cylinder (7).

2. The ship air intake system dynamic pressure opening bypass device according to claim 1, characterized in that, The mounting base includes a grooved housing; the bottom of the grooved housing is provided with a flange (1) for connecting to the air intake system, and the top is bolted with a fixing seat (8); the pressure relief port is located at the bottom of the grooved housing.

3. The ship air intake system dynamic pressure opening bypass device according to claim 2, characterized in that, The fixed base (8) includes a fixed plate, on which a sleeve matching the position of the cylinder (7) is provided; the fixed plate is fixed to the top of the groove-shaped housing by a number of fastening screws A (9); the sleeve communicates with the pressure relief chamber; the cylinder body of the cylinder (7) is coaxially fixed inside the sleeve.

4. The ship air intake system dynamic pressure opening bypass device according to claim 3, characterized in that, The cylinder (7) has a cylindrical seat through which the air rod passes at its outer end. The cylindrical seat is coaxially embedded in the sleeve and fixed to the sleeve by several fastening screws B (6).

5. The ship air intake system dynamic pressure opening bypass device according to claim 4, characterized in that, The dynamic pressure plate (2) is provided with a spring seat B in the middle, and a spring (3) is sleeved on the spring seat B; the spring seat B slides through the mounting base; a plurality of cylinders (7) are evenly distributed relative to the center circumference of the spring seat B.

6. The ship air intake system dynamic pressure opening bypass device according to claim 5, characterized in that, The pressure difference between the two ends of the dynamic pressure plate (2) is P, the area of ​​the pressure relief port is S, the number of springs (3) is n, the elastic coefficient of the springs (3) is k, and the original compression of the springs (3) is x; x = (P × S) / (n × k).

7. The ship air intake system dynamic pressure opening bypass device according to claim 6, characterized in that, The three-position five-way solenoid valve is a center-leaking three-position five-way solenoid valve.

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