Adjustable negative pressure bypass door for gas inlet system of gas turbine

Abstract

The utility model belongs to the technical field of gas turbines, and particularly discloses an adjustable negative pressure bypass door for an air inlet system of a gas turbine, the adjustable negative pressure bypass door comprises a shell and a door plate, and the shell is of a cylindrical structure with an air inlet and an air outlet; the air inlet inclines towards the outside of the shell relative to the horizontal plane; the door plate is arranged at the air inlet, the top edge of the door plate is connected with the inner wall of the upper portion of the shell through a rotating shaft, and the door plate can turn around the rotating shaft from the interior of the shell to the exterior of the shell under the gravity effect to seal and close the air inlet. And a counterweight pressing block capable of translating is arranged on the door plate and is used for adjusting the pressing torque when the door plate and the air inlet are closed in a matched manner. By changing the gravity center of the door plate of the negative pressure bypass door, the pressing torque generated when the door plate and the air inlet are closed in a matched mode can be adjusted.

Description

Technical Field

[0001] The present application belongs to the technical field of gas turbines, and more specifically, relates to an adjustable negative pressure bypass door for a gas turbine intake system. Background Art

[0002] The gas turbine air intake system is an essential auxiliary system for the gas turbine. It is used to filter impurities in the ambient air, provide the gas turbine with clean air that meets the use requirements, and prevent impurities in the air from damaging the gas turbine. Under normal working conditions of the gas turbine air intake system, the internal pressure is negative. When the filter element is suddenly severely blocked or the gas turbine surges, the internal negative pressure will increase sharply. In order to prevent the negative pressure from causing overpressure damage to the air intake system before shutdown, a negative pressure bypass door structure is required. When the negative pressure inside the air duct reaches a certain value, bypass pressure relief is performed to protect the air intake system. At the same time, the limit switch monitoring signal triggers an alarm and shutdown.

[0003] The traditional counterweight bypass door has the following problems during use: (1) The center of gravity of the traditional counterweight bypass door is fixed and cannot be adjusted. During use, the opening pressure cannot be adjusted according to actual needs, and it lacks versatility; (2) The door panel and the shell are prone to rigid collision; (3) The seal is squeezed loose or the seal is not tight; (4) Ice forms between the door panel and the shell in a cold environment and the door panel cannot be opened in time. Utility Model Content

[0004] In view of the defects of the prior art, the purpose of the present application is to provide an adjustable negative pressure bypass door for a gas turbine intake system, aiming to solve the problem that the center of gravity of the traditional counterweight bypass door cannot be adjusted and lacks versatility.

[0005] To achieve the above-mentioned purpose, the present application provides an adjustable negative pressure bypass door for a gas turbine air intake system, comprising a shell and a door panel, wherein the shell is a cylindrical structure having an air inlet and an air outlet; the air inlet is inclined toward the outside of the shell relative to a horizontal plane; the door panel is arranged at the air inlet, and its top edge is connected to the upper inner wall of the shell through a rotating shaft, and the door panel can be flipped around the rotating shaft from the inside of the shell to the outside of the shell under the action of gravity to seal and close the air inlet; a counterweight pressing block that can be moved horizontally is arranged on the door panel, and the counterweight pressing block is used to adjust the pressing torque when the door panel and the air inlet are closed in coordination.

[0006] Furthermore, a guide rail for installing a counterweight pressing block is provided on the surface of the door panel near the air outlet, and limit supports parallel to the guide rail are provided on both sides thereof. The limit supports are connected to the ends of the counterweight pressing block to limit the translational height of the counterweight pressing block.

[0007] Furthermore, a mounting guide groove which cooperates with the guide rail is provided on a surface of the counterweight pressing block close to the door panel.

[0008] Furthermore, the door panel is also provided with a height adjustment structure parallel to the guide rail, and the height adjustment structure is used to make the counterweight pressing block translate to approach or move away from the rotating shaft.

[0009] Furthermore, a door panel support is provided on the upper inner wall of the shell near the air inlet, and a connecting seat matching with the door panel support is provided on the top edge of the door panel. The rotating shaft passes through the door panel support and the connecting seat to connect the door panel to the shell.

[0010] Furthermore, an elastic damping layer is provided on the upper inner wall of the shell near the air outlet, and the elastic damping layer is used to prevent the door panel from colliding with the upper inner wall of the shell.

[0011] Furthermore, at least one inductive limit switch is provided on the side wall of the bottom edge of the air inlet, which is used to sense whether the door panel and the air inlet are sealed and matched.

[0012] Furthermore, a flange frame matching with the door panel is arranged at the periphery of the air inlet, and a U-shaped sealing strip is arranged on the circumferential side wall of the door panel, and the U-shaped sealing strip matches with the flange frame to achieve three-sided sealing.

[0013] Furthermore, a heating cable is arranged on the periphery of the flange frame.

[0014] Furthermore, an inlet filter assembly is provided on a side of the air inlet away from the door panel, and the filter assembly includes a metal frame and a double-layer stainless steel metal mesh structure connected to the inside of the metal frame.

[0015] In general, the above technical solutions conceived by this application have the following technical advantages compared with the prior art:

[0016] 1. The present application enables the counterweight on the bypass door to translate on the door panel to change the position of the center of gravity of the door panel, thereby changing the torque when the door panel is flipped, so that the compression torque when the air inlet is closed can be variable, thereby being able to cope with different negative pressure conditions inside the shell.

[0017] 2. The present application sets an elastic damping layer on the top of the shell. When the door panel flips over to open the air inlet under the action of negative pressure, it can lean against the elastic damping layer to avoid direct contact with the shell, resulting in a rigid collision to destroy the shell.

[0018] 3. The door panel of the present application is provided with a U-shaped sealing strip, which cooperates with the flange frame at the air inlet to form a three-sided sealing structure, and utilizes the door panel's own gravity to press tightly to achieve effective sealing.

[0019] 4. A heating cable is also provided on the periphery of the flange frame of the present application. When ice forms between the door panel and the shell in a cold environment and the door panel cannot be opened in time, the heating cable can be activated to melt the ice to ensure that the air inlet can be opened normally. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of an adjustable negative pressure bypass door provided in an embodiment of the present application;

[0021] Figure 2 is a schematic diagram of the ventilation housing structure provided in an embodiment of the present application;

[0022] Figure 3 is a schematic diagram of the structure of a door panel assembly provided in an embodiment of the present application;

[0023] Figure 4 It is a schematic diagram of the structure of the inlet filter assembly provided in an embodiment of the present application.

[0024] In all the drawings, the same reference numerals are used to represent the same elements or structures, wherein: 1-housing, 1.1-ventilation chamber, 1.2-door panel support, 1.3-flange frame, 1.4-mounting support, 1.5-threading tube, 1.6-elastic damping layer, 1.7-air inlet, 1.8-air outlet; 2-door panel, 2.1-rotating shaft, 2.10-fastener, 2.11-U-shaped sealing strip, 2.12-door panel elastic damping layer, 2.13-door panel cross bar, 2.2-connecting seat, 2.3-door panel body, 2.4-limit support, 2.5-counterweight pressing block, 2.6-guide rail, 2.7-nut, 2.8-threaded rod, 2.9-adjusting support; 3-filter assembly, 3.1-metal frame, 3.2-inner metal mesh, 3.3-outer metal mesh; 4-inductive limit switch, 5-heating cable. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] An embodiment of the present application provides an adjustable negative pressure bypass door structure, such as Figure 1As shown, it includes a shell 1 and a door panel 2, wherein the shell 1 is a cylindrical structure with an air inlet 1.7 and an air outlet 1.8; the air inlet 1.7 is inclined toward the outside of the shell 1 relative to the horizontal plane; the door panel 2 is arranged at the air inlet 1.7, and its top edge is connected to the upper inner wall of the shell 1 through a rotating shaft 2.1, and the door panel 2 can be flipped around the rotating shaft 2.1 from the inside of the shell to the outside of the shell under the action of gravity to seal and close the air inlet 1.7; a counterweight pressing block 2.5 that can be translated is provided on the door panel 2, and the counterweight pressing block 2.5 is used to adjust the pressing torque when the door panel 2 and the air inlet 1.7 are closed in coordination.

[0027] Specifically, the ventilation shell (i.e., shell 1) is a cylindrical structure with an inclined cover that is wider at the top and narrower at the bottom. The main body is made of sheet metal, and is provided with an air inlet 1.7 and an air outlet 1.8, and is flange-connected at the front and back. The air inlet surface is a structure in which the upper part is inclined toward the outside of the shell relative to the horizontal plane, and the lower part is inclined toward the inside of the shell relative to the horizontal plane, so that the angle between the air inlet surface and the horizontal plane is 75°, that is, the inclination angle of the air inlet surface to the outside of the shell is 25°.

[0028] In this embodiment, if Figure 3 As shown, a guide rail 2.6 for mounting a counterweight pressing block 2.5 is provided on the surface of the door panel 2 near the air outlet 1.8, and limit supports 2.4 parallel to the guide rail 2.6 are provided on both sides of the door panel body 2.3. The limit supports 2.4 are connected to the ends of the counterweight pressing block 2.5 to limit the translation height of the counterweight pressing block 2.5, and a door panel cross bar 2.13 is used to separate the door panel body 2.3 from the filter assembly 3, and a door panel elastic damping layer 2.12 is also provided on the door panel cross bar 2.13 to prevent the door panel body 2.3 from rigid collision with the filter assembly 3.

[0029] Specifically, the counterweight pressing block 2.5 is guided by double guide rails, and an installation guide groove that cooperates with a pair of guide rails 2.6 is opened on the side of the counterweight pressing block 2.5 close to the door panel 2, and an open large semicircular cross-section guide groove is correspondingly opened on the counterweight pressing block 2.5. The large semicircular cross-section structure on the guide rail 2.6 and the open large semicircular cross-section guide groove on the counterweight pressing block 2.5 are clearance-matched, which can both guide and limit the radial separation of the counterweight pressing block 2.5.

[0030] More specifically, limit supports 2.4 for fixing the counterweight clamping block 2.5 are provided on both sides of the door panel 2, and slot holes (not shown in the figure) are opened on the limit supports 2.4 corresponding to the adjustment stroke. After the counterweight clamping block 2.5 is translated and adjusted to a specific position, its two ends are fixedly connected to the slot holes on the limit supports by fasteners 2.10.

[0031] In this embodiment, the door panel 2 is also provided with a height adjustment structure parallel to the guide rail 2.6. The height adjustment structure is used to make the counterweight pressing block 2.5 translate to approach or move away from the rotating shaft 2.1, and the size of the pressing torque is adjusted by adjusting the distance between the counterweight pressing block 2.5 and the flip center; specifically, the height adjustment structure includes an adjustment support 2.9, a nut 2.7 and a threaded rod 2.8, wherein: the adjustment support 2.9 is fixed on the door panel 2 and is located below the counterweight pressing block 2.5, and is provided with a threaded hole for the threaded rod to pass through; the threaded rod 2.8 is successively passed through the nut 2.7 and the threaded hole, and the nut 2.7 can be tightened with the threaded rod 2.8 and abut against the adjustment support 2.9; more specifically, the nut 2.7 is welded and fixed to the corresponding adjustment support 2.9, and the counterweight pressing block 2.5 is processed with a countersunk hole structure (not shown in the figure) at the contact position of the corresponding threaded rod 2.8, which is used to position and cooperate the threaded rod 2.8 with the counterweight block body 2.5.

[0032] In this embodiment, a door panel support 1.2 is provided on the upper inner wall of the shell 1 near the air inlet 1.7, and a connecting seat 2.2 that cooperates with the door panel support 1.2 is provided on the top edge of the door panel 2. The rotating shaft 2.1 is passed through the door panel support 1.2 and the connecting seat 2.2 to connect the door panel 2 with the shell 1.

[0033] In this embodiment, the shell 1 has a ventilation cavity 1.1, and an elastic damping layer 1.6 is provided on the upper inner wall of the ventilation cavity 1.1 near the air outlet 1.8, and the elastic damping layer 1.6 is used to prevent the door panel 2 from colliding with the upper inner wall of the shell 1; specifically, the internal space of the shell 1 allows the maximum flip opening of the door panel 2 to be 90°, so the elastic damping layer 1.6 can prevent the door panel assembly 2 from rigidly colliding with the ventilation shell 1 under the action of excessive pressure difference.

[0034] In this embodiment, at least three induction limit switches 4 are provided on the side wall of the bottom side of the air inlet 1.7, which are used to sense whether the door panel 2 and the air inlet 1.7 are sealed together; each limit switch 4 is installed on the corresponding mounting support 1.4 on the shell 1. When two of the three limit switches 4 show closed, it can be considered that the door panel 2 is closed in place.

[0035] In this embodiment, a flange frame 1.3 matching with the door panel 2 is arranged at the periphery of the air inlet 1.7, and a U-shaped sealing strip 2.11 is arranged on the circumferential side wall of the door panel 2. The U-shaped sealing strip 2.11 matches with the flange frame 1.3 to achieve three-sided sealing.

[0036] In this embodiment, a heating cable 5 is further provided on the periphery of the flange frame 1.3, and wire threading tubes 1.5 are arranged in sections in the shell 1, and the wire threading tubes 1.5 surround the entrance of the flange frame. The heating cable 5 is inserted into the wire threading tube. When working in a cold environment, the problem of opening failure caused by ice at the closing point of the flange frame and the door panel can be avoided.

[0037] In this embodiment, an inlet filter assembly 3 is further provided on the side of the air inlet 1.7 away from the door panel 2. The filter assembly 3 includes a metal frame 3.1 and a double-layer stainless steel metal mesh structure connected to the inside of the metal frame 3.1; specifically, the metal frame 3.1 is connected and installed using threaded fasteners, and the filter assembly is a double-layer stainless steel metal mesh structure with a combination of coarse and fine. The mesh diameter of the inner metal mesh 3.2 is not less than 2 mm, and the outer metal mesh 3.3 is made of 10-20 mesh stainless steel metal mesh, which can effectively filter visible particulate matter in the air and prevent environmental foreign matter from entering the system when the door panel 2 is opened, thereby causing damage to the gas turbine.

[0038] In a preferred embodiment, at a position close to the single-sided guide rail on the door panel 2, a force arm change scale is marked along the guide rail 2.6 from bottom to top, with the position when the lower end surface of the counterweight pressing block 2.5 is flush with the bottom end surface of the door being the zero position, and gradually decreasing arithmetic progression upwards. The torque change value can be quickly determined based on the force arm scale value.

[0039] When the negative pressure inside the air intake system reaches the opening pressure setting value (the opening pressure of the door panel 2 can be accurately adjusted according to actual needs or different unit applications, and has a wide range of applications), the door panel 2 opens, and the limit switch 4 sends an alarm signal. The opening of the door panel 2 is determined by the internal and external pressure difference. When the pressure difference is too large, the elastic damping layer 1.6 on the top of the inner side of the shell 1 can buffer the impact of the door panel assembly 2. After shutdown, the door panel 2 falls back to its original position under the action of gravity, and the U-shaped sealing strip 2.11 on the door panel 2 is pressed and sealed with the flange frame 1.3 on the shell 1. During the falling process, the door panel 2 can also play a buffering role by setting the door panel elastic damping layer 2.12, and the limit switch 4 signal can be used to determine whether the door panel 2 is closed in place.

[0040] It should be understood that expressions such as "include" and "may include" used in this application indicate the existence of the disclosed functions, operations or constituent elements, and do not limit one or more additional functions, operations and constituent elements. In this application, terms such as "include" and / or "have" may be interpreted as indicating specific characteristics, numbers, operations, constituent elements, components or combinations thereof, but may not be interpreted as excluding the existence or possibility of adding one or more other characteristics, numbers, operations, constituent elements, components or combinations thereof.

[0041] It should be understood that the terms "center", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0042] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0043] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0044] It is easy for those skilled in the art to understand that the above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present application should be included in the protection scope of the present application.

Claims

1. An adjustable negative pressure bypass door for a gas turbine air intake system, characterized in that: The invention comprises a shell (1) and a door panel (2), wherein the shell (1) is a cylindrical structure having an air inlet (1.7) and an air outlet (1.8); the air inlet (1.7) is inclined toward the outside of the shell (1) relative to a horizontal plane; the door panel (2) is arranged at the air inlet (1.7), and its top edge is connected to the upper inner wall of the shell (1) through a rotating shaft (2.1); the door panel (2) can be turned around the rotating shaft (2.1) from the inside of the shell to the outside of the shell under the action of gravity to seal and close the air inlet (1.7); a counterweight pressing block (2.5) that can be translated is arranged on the door panel (2), and the counterweight pressing block (2.5) is used to adjust the pressing torque when the door panel (2) and the air inlet (1.7) are closed in coordination.

2. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 1, characterized in that: A guide rail (2.6) for mounting a counterweight pressing block (2.5) is provided on the surface of the door panel (2) near the air outlet (1.8), and limit supports (2.4) parallel to the guide rail (2.6) are provided on both sides thereof. The limit supports (2.4) are connected to the ends of the counterweight pressing block (2.5) and are used to limit the translation height of the counterweight pressing block (2.5).

3. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 2, characterized in that: A mounting guide groove which is matched and connected with the guide rail (2.6) is provided on a surface of the counterweight pressing block (2.5) close to the door panel (2).

4. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 2, characterized in that: The door panel (2) is also provided with a height adjustment structure parallel to the guide rail (2.6), and the height adjustment structure is used to make the counterweight pressing block (2.5) translate to approach or move away from the rotating shaft (2.1).

5. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 1, characterized in that: A door panel support (1.2) is provided on the upper inner wall of the shell (1) near the air inlet (1.7), a connecting seat (2.2) matching the door panel support (1.2) is provided on the top edge of the door panel (2), and the rotating shaft (2.1) is passed through the door panel support (1.2) and the connecting seat (2.2) to connect the door panel (2) to the shell (1).

6. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 1, characterized in that: An elastic damping layer (1.6) is provided on the upper inner wall of the shell (1) close to the air outlet (1.8), and the elastic damping layer (1.6) is used to prevent the door panel (2) from colliding with the upper inner wall of the shell (1).

7. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 1, characterized in that: At least three inductive limit switches (4) are also provided on the side wall of the bottom edge of the air inlet (1.7), which are used to sense whether the door panel (2) and the air inlet (1.7) are sealed and matched.

8. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 1, characterized in that: The periphery of the air inlet (1.7) is provided with a flange-type frame (1.3) that matches the door panel (2), and the circumferential side wall of the door panel (2) is provided with a U-shaped sealing strip (2.11), and the U-shaped sealing strip (2.11) matches the flange-type frame (1.3) to achieve three-sided sealing.

9. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 8, characterized in that: A heating cable (5) is also arranged on the periphery of the flange frame (1.3).

10. The adjustable negative pressure bypass door for a gas turbine air intake system according to claim 1, characterized in that: An inlet filter assembly (3) is also provided on the side of the air inlet (1.7) away from the door panel (2), and the filter assembly (3) comprises a metal frame (3.1) and a double-layer stainless steel metal mesh structure connected to the inside of the metal frame (3.1).

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