Single-cylinder double-rod bidirectional actuator cylinder and gas turbine with same

Abstract

The invention relates to the technical field of gas turbines, and discloses a single-cylinder double-rod bidirectional actuator cylinder and a gas turbine with the same. The single-cylinder double-rod two-way actuator cylinder comprises a cylinder body, an inner cavity of which is arranged in a sealed manner; the first lining cylinder and the second lining cylinder are both installed in an inner cavity of the cylinder body in a sealed and sliding mode, a first piston rod is installed on the side, away from the second lining cylinder, of the first lining cylinder, and a second piston rod is installed on the side, away from the first lining cylinder, of the second lining cylinder. The inner cavity of the cylinder body is divided into a first rod cavity, a rodless cavity and a second rod cavity by the first lining cylinder and the second lining cylinder. The mass of hydraulic media in the first rod cavity, the rodless cavity and the second rod cavity is adjusted, so that the relative positions of the first lining cylinder and the second lining cylinder in the cylinder body are controlled, and bidirectional movement of the piston rod can be achieved. The actuator cylinder has the advantages of being compact in structure, light in weight and easy to control, and operation efficiency and safety of the gas turbine are improved.

Description

Technical Field

[0001] The present invention relates to the technical field of gas turbines, and in particular to a single-tube double-rod bidirectional actuating cylinder and a gas turbine having the same. Background Art

[0002] With the continuous growth of energy demand and the increasing environmental protection requirements, gas turbines, as an efficient and clean energy conversion equipment, have been widely used in my country. In order to meet the market demand for high efficiency, safe and reliable operation of gas turbines, the design and manufacturing technology of gas turbines has been continuously improved, among which higher requirements are put forward for the mechanical design of compressors and turbine blades.

[0003] In the operation of gas turbines, in order to obtain higher operating efficiency and ensure safe operation, it is necessary to optimize the design of blades such as compressors or turbines. Among them, the design of the adjustable guide vane structure has become a key link. By adjusting the airflow angle of the guide vane, the guide vane outlet area can be changed, so that the compressor and turbine can operate at a more suitable state point, thereby improving the overall performance.

[0004] In the prior art, when designing the adjustable guide vane structure inside the gas turbine, for the mechanism that requires bidirectional drive, a separate transmission method is usually adopted to control and drive it separately. Although this design can achieve bidirectional drive, it will result in a larger space required for the installation of the internal drive structure of the gas turbine, a heavier structure weight, and complex control, resulting in lower cost and efficiency. Summary of the invention

[0005] In view of this, the present invention provides a single-tube, double-rod, bidirectional actuator and a gas turbine having the same, so as to solve the problems in the prior art that the internal drive structure of the gas turbine requires a large space for installation, has a heavy structure weight, and is complex to control.

[0006] In a first aspect, the present invention provides a single-tube, double-rod, bidirectional actuator, comprising:

[0007] The cylinder body has an inner cavity sealed therein;

[0008] A first liner and a second liner, both of which are sealed and slidably mounted in the inner cavity of the cylinder body, a first piston rod is mounted on the side of the first liner away from the second liner along the sliding direction of the first liner and the second liner, and a second piston rod is mounted on the side of the second liner away from the first liner, and both of the first piston rod and the second piston rod extend outside the cylinder body;

[0009] The first bushing and the second bushing divide the inner cavity of the barrel body into a first rod cavity, a rodless cavity and a second rod cavity. The first rod cavity, the rodless cavity and the second rod cavity are all provided with oil inlet and return interfaces.

[0010] The single-tube double-rod bidirectional actuator is installed inside the gas turbine as a driving structure. The first piston rod and the second piston rod extending outside the cylinder body are respectively connected to different external structures, thereby driving the external structure to move bidirectionally under the drive of the first piston rod and the second piston rod. The first liner and the second liner are sealed and slidably installed in the inner cavity of the cylinder body, and the first piston rod and the second piston rod are respectively installed in the sliding direction of the first liner and the second liner, so as to realize bidirectional control and drive. The first liner and the second liner divide the inner cavity of the cylinder body into a first rod cavity, a rodless cavity and a second rod cavity. Each cavity is provided with an oil inlet and return interface. The amount of hydraulic medium in the first rod cavity, the rodless cavity and the second rod cavity is adjusted by controlling the oil inlet or return of the oil inlet and return interface, so as to control the relative position of the first liner and the second liner in the cylinder body, and realize the bidirectional movement of the piston rod. The actuator realizes bidirectional control in a limited space, has the characteristics of compact structure, light weight and simple control, effectively solves the problems of large space occupation, heavy weight and complex control of traditional actuators, and improves the operating efficiency and safety of the gas turbine.

[0011] In an optional embodiment, a first limiting ring is installed on a side of the first bushing facing the second bushing; a second limiting ring is installed on a side of the second bushing facing the first bushing. By arranging the first limiting ring and the second limiting ring between the first bushing and the second bushing, the relative movement range of the first bushing and the second bushing is limited, mechanical collision or damage caused by excessive movement is prevented, and the stability and safety of the actuator are improved.

[0012] In an optional embodiment, abutment notches are provided on one side of the first limiting ring facing the second limiting ring and on one side of the second limiting ring facing the first limiting ring. The abutment notches can better disperse the contact pressure when the limiting rings are in contact, reduce wear, and provide a more precise limiting effect, further improving the accuracy and reliability of the actuator.

[0013] In an optional embodiment, a first seal is installed between the outer wall of the first liner and / or the outer wall of the second liner and the inner wall of the cylinder body. The provision of the first seal effectively prevents leakage of hydraulic medium between the liner and the cylinder body, ensures the sealing and normal operation of the hydraulic system, and improves the working efficiency and service life of the actuator cylinder.

[0014] In an optional embodiment, a second seal is installed between the outer wall of the first piston rod and / or the outer wall of the second piston rod and the cylinder body. The second seal can prevent leakage of hydraulic medium between the piston rod and the cylinder body, and prevent external impurities from entering the hydraulic system, thereby ensuring the cleanliness and stable operation of the hydraulic system and extending the service life of the actuator cylinder.

[0015] In an optional embodiment, a sealing installation groove is provided on the cylinder body, and the second sealing member is installed on the sealing installation groove. By providing the sealing installation groove, the installation of the second sealing member can be made more stable and reliable, ensuring the normal operation of the sealing member under high pressure environment, and further improving the sealing performance and reliability of the actuator cylinder.

[0016] In an optional embodiment, the cylinder body includes a first cylinder body and a second cylinder body that are detachably connected, and the first cylinder body and the second cylinder body are sealed by a sealing nut sleeve. By setting the cylinder body as a first cylinder body and a second cylinder body that are detachably connected, the assembly and maintenance of the actuator cylinder are facilitated, and the sealing performance of the connection is ensured by the sealing nut sleeve, thereby improving the overall reliability and maintenance convenience of the actuator cylinder.

[0017] In an optional embodiment, a third seal is installed on the inner side of the sealing nut to further enhance the sealing performance between the sealing nut and the cylinder body, prevent leakage of hydraulic oil at the connection, ensure the normal operation of the hydraulic system, and improve the sealing and reliability of the actuator cylinder.

[0018] In an optional embodiment, an external connecting piece is installed at one end of the first piston rod and / or the second piston rod extending outside the cylinder body, which facilitates the connection of the first piston rod and the second piston rod with external equipment, realizes efficient transmission between the actuator cylinder and the external equipment, and improves the applicability and connection stability of the actuator cylinder.

[0019] In a second aspect, the present invention further provides a gas turbine having the single-tube double-rod bidirectional actuator described in the present invention. Because the gas turbine includes a single-tube double-rod bidirectional actuator, it has the same effect as the single-tube double-rod bidirectional actuator, and will not be described in detail here. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic structural diagram of a single-cylinder, double-rod, bidirectional actuating cylinder provided in an embodiment of the present invention.

[0022] Figure 2 A schematic structural diagram of a single-cylinder, double-rod, bidirectional actuating cylinder in another working state provided by an embodiment of the present invention.

[0023] Figure 3 A schematic structural diagram of a single-cylinder, double-rod, bidirectional actuating cylinder in another working state provided by an embodiment of the present invention.

[0024] Explanation of the accompanying drawings: 1. First cylinder; 2. Second cylinder; 3. First liner; 4. Second liner; 5. First piston rod; 6. Second piston rod; 7. First limiting ring; 8. Second limiting ring; 9. First sealing member; 10. Oil inlet and return interface; 11. Second sealing member; 12. Third sealing member; 13. Sealing nut; 14. External connecting member. DETAILED DESCRIPTION

[0025] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0026] Combine the following Figures 1 to 3 , describing an embodiment of the present invention.

[0027] According to an embodiment of the present invention, on the one hand, a single-tube, double-rod, two-way actuator is provided, comprising a cylinder body, a first liner 3 and a second liner 4 .

[0028] The inner cavity of the cylinder body adopts a sealing structure design to ensure the stable flow and pressure maintenance of the hydraulic medium in the internal chamber. The first liner 3 and the second liner 4 are both installed in the inner cavity of the cylinder body by a sealed sliding manner, and can maintain good sealing performance during the sliding process. Along the sliding direction of the first liner 3 and the second liner 4, the first piston rod 5 is installed on the side of the first liner 3 away from the second liner 4, and the second piston rod 6 is installed on the side of the second liner 4 away from the first liner 3. The first piston rod 5 and the second piston rod 6 both extend to the outside of the cylinder body so as to connect with external equipment and transmit power. The first liner 3 and the second liner 4 divide the inner cavity of the cylinder body into a first rod cavity, a rodless cavity and a second rod cavity. Each cavity is provided with an oil inlet and return interface 10. By controlling the oil inlet or oil return of the oil inlet and return interface 10, the amount of hydraulic medium in the cavity can be accurately adjusted, thereby realizing the control of the relative position of the first liner 3 and the second liner 4 in the cylinder body, and then realizing the bidirectional movement of the piston rod. The actuator can achieve two-way control in a limited space, and has the characteristics of compact structure, light weight and simple control. It effectively solves the problems of traditional actuators that occupy a large space, are heavy and have complex control, and significantly improves the operating efficiency and safety of the gas turbine.

[0029] In one embodiment, a first limiting ring 7 is installed on the side of the first liner 3 facing the second liner 4, and a second limiting ring 8 is installed on the side of the second liner 4 facing the first liner 3. The first limiting ring 7 and the second limiting ring 8 cooperate to limit the relative movement range of the first liner 3 and the second liner 4, prevent mechanical collision or damage caused by excessive movement, and significantly improve the stability and safety of the actuator. During the operation of the gas turbine, when encountering sudden airflow changes or load fluctuations, the limiting ring can effectively limit the movement range of the liner, avoid equipment failure caused by excessive displacement, and ensure the smooth operation of the gas turbine.

[0030] Furthermore, abutment notches are provided on one side of the first limiting ring 7 facing the second limiting ring 8 and on one side of the second limiting ring 8 facing the first limiting ring 7. The abutment notches enable the limiting rings to better disperse the contact pressure and reduce wear when in contact, while providing a more precise limiting effect, further improving the accuracy and reliability of the actuator. After long-term operation, the abutment notches can effectively reduce the wear of the limiting rings, maintain their limiting accuracy, and extend the service life of the equipment.

[0031] In some other embodiments, in addition to providing a limiting ring between the first liner 3 and the second liner 4, other limiting structures, such as a limiting block or a limiting spring, may be used to achieve a similar limiting function. In some application scenarios, the limiting spring can provide a more flexible limiting effect to adapt to different working conditions.

[0032] In one embodiment, a first seal 9 is installed between the outer wall of the first liner 3 and the outer wall of the second liner 4 and the inner wall of the cylinder body. These seals are made of high-performance sealing materials, such as polyurethane or fluororubber, which can effectively prevent the leakage of hydraulic medium between the liner and the cylinder body, ensure the sealing and normal operation of the hydraulic system, and improve the working efficiency and service life of the actuator. In a high-temperature and high-pressure working environment, the first seal 9 can maintain good sealing performance, prevent hydraulic oil leakage, and ensure the stable operation of the gas turbine.

[0033] In one embodiment, a second seal 11 is installed between the outer wall of the first piston rod 5 and / or the outer wall of the second piston rod 6 and the cylinder body. The second seal 11 can effectively prevent the leakage of hydraulic medium between the piston rod and the cylinder body, and prevent external impurities from entering the hydraulic system, thereby ensuring the cleanliness and stable operation of the hydraulic system and extending the service life of the actuator cylinder. In a harsh working environment, the second seal 11 can prevent impurities such as dust and moisture from entering the hydraulic system, avoid damage to hydraulic components, and improve the reliability of the equipment.

[0034] In one embodiment, a seal installation groove is provided on the cylinder body, and the second seal 11 is installed on the seal installation groove. The design of these seal installation grooves makes the installation of the second seal 11 more stable and reliable, ensuring the normal operation of the seal under high pressure environment, and further improving the sealing performance and reliability of the actuator cylinder. In a high-pressure hydraulic system, the seal installation groove can effectively prevent the second seal 11 from being displaced or damaged under high pressure, ensuring its sealing performance.

[0035] In one embodiment, the cylinder body includes a first cylinder body 1 and a second cylinder body 2 that are detachably connected, and the first cylinder body 1 and the second cylinder body 2 are sealed by a sealing nut 13 sleeve. The detachable connection design facilitates the assembly and maintenance of the actuator, and the sealing nut 13 sleeve can ensure the sealing performance of the connection, thereby improving the overall reliability and maintenance convenience of the actuator. When the actuator needs to be repaired or parts replaced, the detachable cylinder body design makes maintenance work more convenient and reduces downtime.

[0036] Furthermore, a third seal 12 is installed on the inner side of the sealing nut 13 to further enhance the sealing performance between the sealing nut 13 and the cylinder body, prevent the leakage of hydraulic oil at the connection, ensure the normal operation of the hydraulic system, and improve the sealing performance and reliability of the actuator cylinder. After long-term operation, the third seal 12 can effectively prevent leakage between the sealing nut 13 and the cylinder body and maintain the normal operation of the hydraulic system.

[0037] In some other embodiments, in addition to the sleeve connection through the sealing nut 13, other connection methods, such as flange connection or clamp connection, can also be used to achieve similar sealing effects. In situations where frequent disassembly is required, the clamp connection can provide a more convenient connection method.

[0038] In one embodiment, a connecting tail handle ring as an external connecting member 14 is installed at one end of the first piston rod 5 and the second piston rod 6 extending outside the cylinder body. These external connecting members 14 are made of high-strength materials, which facilitate the connection between the first piston rod 5 and the second piston rod 6 and the external device, realize the efficient transmission between the actuator and the external device, and improve the applicability and connection stability of the actuator. In the blade adjustment system of the gas turbine, the external connecting member 14 can ensure the stable connection between the piston rod and the blade adjustment mechanism, and realize accurate blade angle adjustment. In this embodiment, the connecting tail handle ring is coaxially connected to the first piston rod 5 and the second piston rod 6. In some other embodiments, other connection methods such as welding or riveting can be used between the connecting tail handle ring and the first piston rod 5 and the second piston rod 6 to achieve a more secure connection. For example, in some special application scenarios, the welding connection can provide higher connection strength and meet higher working requirements.

[0039] In this embodiment, the first seal 9, the second seal 11 and the third seal 12 are all made of rubber rings. In some other embodiments, the first seal 9, the second seal 11 and the third seal 12 can also be made of polyurethane or other high-performance sealing materials, such as silicone rubber or EPDM rubber, to meet the requirements of different working environments. In a high temperature environment, the silicone rubber seal can maintain good sealing performance.

[0040] According to an embodiment of the present invention, on the other hand, a gas turbine is provided, which has the single-tube double-rod bidirectional actuator described in the present invention. Because the gas turbine includes a single-tube double-rod bidirectional actuator, it has the same effect as the single-tube double-rod bidirectional actuator, and will not be described in detail here.

[0041] The single-cylinder, double-rod, double-acting actuator works as follows:

[0042] In the initial state, if Figure 1 As shown, the first liner 3 and the second liner 4 are located in the middle position of the cylinder body, the first piston rod 5 and the second piston rod 6 are both in the middle position, and the hydraulic medium pressures in the first rod chamber, the rodless chamber and the second rod chamber are balanced.

[0043] When the first piston rod 5 and the second piston rod 6 move in both directions, the relative movement of the first liner 3 and the second liner 4 in the cylinder body can be achieved by controlling the oil path of the oil inlet and return interface, thereby driving the first piston rod 5 and the second piston rod 6 to move in both directions. The specific working method is as follows:

[0044] The first piston rod 5 moves to the left, and the second piston rod 6 moves to the right:

[0045] like Figure 2 As shown, the oil inlet and return interface on the rodless chamber is inlet, and the oil inlet and return interface on the first rod chamber and the oil inlet and return interface on the second rod chamber are inlet, and the hydraulic oil enters the first rod chamber, pushing the first bushing 3 and the first piston rod 5 to move leftward, while the hydraulic oil flows back from the second rod chamber and the rodless chamber, pushing the second bushing 4 and the second piston rod 6 to move rightward. When the first bushing 3 and the second bushing 4 reach the mechanical limit position with the cylinder body respectively, the first piston rod 5 continues to move leftward, and the second piston rod 6 continues to move rightward until they reach the maximum extension position.

[0046] The first piston rod 5 and the second piston rod 6 move to the left at the same time:

[0047] like Figure 3As shown, the oil inlet and return interface on the second rod chamber is filled with oil, the oil inlet and return interface on the first rod chamber is returned with oil, and the oil inlet and return interface on the rodless chamber does not flow, and the hydraulic oil enters the second rod chamber, pushing the first bushing 3 and the second bushing 4 to move to the left at the same time, and the first piston rod 5 and the second piston rod 6 also move to the left at the same time. When the first bushing 3 and the second bushing 4 reach the mechanical limit position with the cylinder body respectively, the first piston rod 5 and the second piston rod 6 continue to move to the left until they reach the maximum extension position.

[0048] The first piston rod 5 moves to the left, and the second piston rod 6 moves to the right (at different rates):

[0049] When the oil inlet and return ports on the rodless chamber and the oil inlet and return ports on the second rod chamber are simultaneously filled with oil, and the oil inlet and return ports on the first rod chamber are returned with oil, the hydraulic oil enters the first rod chamber and the second rod chamber respectively, pushing the first bushing 3 and the second bushing 4 to move leftward at different rates. When the first bushing 3 reaches the mechanical limit position with the cylinder body, the first piston rod 5 continues to move leftward until it reaches the maximum extension position, and the second piston rod 6 moves rightward until it reaches the maximum retraction position.

[0050] According to an embodiment of the present invention, on the other hand, a gas turbine is provided, which has the single-tube double-rod bidirectional actuator described in the present invention. The single-tube double-rod bidirectional actuator is installed inside the gas turbine as a driving structure, and the first piston rod 5 and the second piston rod 6 extending outside the cylinder body are respectively connected to different external structures, thereby driving the external structure to move in both directions under the drive of the first piston rod 5 and the second piston rod 6. By sealing and slidingly installing the first liner 3 and the second liner 4 in the inner cavity of the cylinder body, and installing the first piston rod 5 and the second piston rod 6 in the sliding direction of the first liner 3 and the second liner 4, bidirectional control and drive are achieved. The first liner 3 and the second liner 4 divide the inner cavity of the cylinder body into a first rod cavity, a rodless cavity, and a second rod cavity. Each cavity is provided with an oil inlet and return interface. The amount of hydraulic medium in the first rod cavity, the rodless cavity, and the second rod cavity is adjusted by controlling the oil inlet or return of the oil inlet and return interface, thereby controlling the relative position of the first liner 3 and the second liner 4 in the cylinder body, and realizing the bidirectional movement of the piston rod. The actuator can realize bidirectional control in a limited space, and has the characteristics of compact structure, light weight and simple control. It effectively solves the problems of traditional actuators that occupy a large space, are heavy and have complex control, and improves the operating efficiency and safety of the gas turbine.

[0051] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A single-tube, double-rod, bidirectional actuator, characterized in that: include: The cylinder body has an inner cavity sealed therein; A first liner (3) and a second liner (4), wherein the first liner (3) and the second liner (4) are both sealed and slidably mounted in the inner cavity of the cylinder body, and along the sliding direction of the first liner (3) and the second liner (4), a first piston rod (5) is mounted on the side of the first liner (3) facing away from the second liner (4), and a second piston rod (6) is mounted on the side of the second liner (4) facing away from the first liner (3), and the first piston rod (5) and the second piston rod (6) both extend outside the cylinder body; The first liner (3) and the second liner (4) divide the inner cavity of the cylinder body into a first rod cavity, a rodless cavity and a second rod cavity, and the first rod cavity, the rodless cavity and the second rod cavity are all provided with oil inlet and return interfaces (10).

2. The single-tube, double-rod, bidirectional actuator according to claim 1, characterized in that: A first limiting ring (7) is installed on a side of the first liner (3) facing the second liner (4); A second limiting ring (8) is installed on a side of the second liner (4) facing the first liner (3).

3. The single-tube, double-rod, bidirectional actuator according to claim 2, characterized in that: Abutment notches are provided on one side of the first limiting ring (7) facing the second limiting ring (8) and on one side of the second limiting ring (8) facing the first limiting ring (7).

4. The single-tube, double-rod, bidirectional actuator according to any one of claims 1 to 3, characterized in that: A first sealing member (9) is installed between the outer wall of the first liner (3) and / or the outer wall of the second liner (4) and the inner wall of the cylinder body.

5. The single-tube, double-rod, bidirectional actuator according to any one of claims 1 to 3, characterized in that: A second sealing member (11) is installed between the outer wall of the first piston rod (5) and / or the outer wall of the second piston rod (6) and the cylinder body.

6. The single-tube, double-rod, bidirectional actuator according to claim 5, characterized in that: The cylinder body is provided with a sealing installation groove, and the second sealing member (11) is installed on the sealing installation groove.

7. The single-tube, double-rod, bidirectional actuator according to any one of claims 1 to 3, characterized in that: The cylinder body comprises a first cylinder (1) and a second cylinder (2) which are detachably connected, and the first cylinder (1) and the second cylinder (2) are sealed by a sealing nut (13) sleeve.

8. The single-tube, double-rod, bidirectional actuator according to claim 7, characterized in that: A third sealing member (12) is installed on the inner side surface of the sealing nut (13).

9. The single-tube, double-rod, bidirectional actuator according to any one of claims 1 to 3, characterized in that: An external connecting piece (14) is installed at one end of the first piston rod (5) and / or the second piston rod (6) extending outside the cylinder body.

10. A gas turbine, characterized in that: A single-tube, double-rod, double-direction actuator as claimed in any one of claims 1 to 9.

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