Pressure pulsation damping structure for water turbine blade

Abstract

The pressure pulsation vibration reduction structure comprises a fixing cylinder, a protective cover is arranged at the upper end of the fixing cylinder, a first sliding groove is formed in the side wall of the fixing cylinder, a fixing rod is arranged in the fixing cylinder, a connecting column is arranged above the fixing rod, and the connecting column and the fixing rod are connected through a first spring; the outer ring wall of the connecting column is connected with one end of a connecting plate, the other end of the connecting plate is connected with one end of a sliding block, the sliding block is slidably connected with the first sliding groove, the other end of the sliding block is connected with the inner ring wall of a connecting ring, and the outer ring wall of the connecting ring is connected with runner blades; part of impact force of water flow on the runner blades is converted into elastic potential energy compressed by the first spring so as to reduce the impact force borne by the runner blades, the transfer rate of the water flow impact force on energy of the runner blades in unit time is reduced, and therefore the instantaneous impact force on the runner blades is reduced, and the amplitude of pressure pulsation borne by the runner blades is reduced. And the stability of the water turbine blade during operation is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of hydropower generation equipment, and in particular relates to a pressure pulsation vibration reduction structure for turbine blades. Background Art

[0002] A turbine is a power machine that converts the energy of water flow into rotational mechanical energy, and the turbine blades are an important component of the turbine. Their function is to drive the turbine blades to rotate through the flow of water, converting the kinetic energy or potential energy of the water flow into mechanical energy, driving the turbine to rotate, and driving the generator to generate electricity.

[0003] The problem encountered in practice is that when water flows to drive the turbine blades to rotate, the flow of water is not constant. For example, the water flow will generate turbulence under conditions of rainfall, cooling, etc., causing the water flow to produce pressure pulsation, that is, unstable impact force on the turbine blades. The direct impact on the turbine blades will cause deformation and vibration of the blades, which will cause fatigue damage to the blade material, leading to blade breakage and reducing the service life of the blades. Utility Model Content

[0004] The present application proposes a pressure pulsation vibration reduction structure for turbine blades, which can be used to buffer the water flow pressure pulsation experienced by the turbine, thereby reducing the vibration caused by the water flow pressure pulsation impacting the turbine blades, which is beneficial to improving the stability of the turbine blades during operation.

[0005] To achieve the above objectives, the present invention provides the following technical solutions:

[0006] A pressure pulsation vibration reduction structure for turbine blades includes a fixed cylinder, a protective cover is provided at the upper end of the fixed cylinder, a first slide groove is opened on the side wall of the fixed cylinder, a fixed rod is provided in the fixed cylinder, a connecting column is provided above the fixed rod, the connecting column and the fixed rod are connected by a first spring, the outer ring wall of the connecting column is connected to one end of the connecting plate, the other end of the connecting plate is connected to one end of the slider, the slider is slidably connected to the first slide groove, the other end of the slider is connected to the inner ring wall of the connecting ring, and the outer ring wall of the connecting ring is connected to the runner blade.

[0007] In one embodiment of the present application, the protective cover is conical in shape.

[0008] In one embodiment of the present application, one end of the first spring is sleeved with the upper end of the fixing rod, and the other end of the first spring is sleeved with the lower end of the connecting column.

[0009] In one embodiment of the present application, a guide rod is connected to the bottom end of the connecting column, a guide hole is opened at the upper end of the fixing rod, and the guide rod is inserted into the guide hole.

[0010] In one embodiment of the present application, the outer wall of the connecting ring is connected to a fixing plate, a connecting tube is fixedly connected to one side of the outer wall of the fixing plate, a clamping tube is inserted into the inside of the connecting tube, one end of the clamping tube is fixedly connected to one end of the second spring, the other end of the second spring is connected to the clamping block, a socket is provided on the side wall of the connecting tube, the socket is used to dock with the clamping block, and the other end of the clamping tube is connected to the side of the runner blade.

[0011] In one embodiment of the present application, a sleeve is connected to the lower end surface of the fixing tube.

[0012] In one embodiment of the present application, the inner wall of the sleeve is slidably connected to a threaded barrel, the outer wall of the threaded barrel is provided with a limiting assembly, the limiting assembly includes a sliding pin, one end of the sliding pin is fixedly connected to the outer wall of the threaded barrel, a second sliding groove is provided on the side wall of the sleeve, and the outer wall of the threaded barrel is threadedly connected to a nut.

[0013] In summary, the technical solution proposed in this application includes the following beneficial technical effects: When the runner blades are impacted by pressure pulsation, the first spring between the connecting column and the fixing rod is compressed to perform work, thereby converting part of the impact force of the water flow on the runner blades into the elastic potential energy of the first spring, thereby reducing the impact force on the runner blades. Furthermore, when the runner blades are impacted by the first spring, the contact time between the water flow impact force and the runner blades is prolonged, reducing the energy transfer rate of the water flow impact force to the runner blades per unit time, thereby reducing the instantaneous impact force on the runner blades and reducing the amplitude of the pressure pulsation experienced by the runner blades, which is beneficial for improving the stability of the turbine blades during operation. Furthermore, a first sliding groove provided on the side wall of the fixing cylinder is used to limit the movement of the slider in the direction in which the first sliding groove is set, preventing the slider from deflecting during movement, thereby improving the stability of the runner blades during the compression of the first spring. Furthermore, multiple runner blades are connected to the outer ring of the same connecting ring, which allows the multiple runner blades to maintain synchronization during movement, preventing the multiple runner blades from deflecting by different amplitudes during movement and buffering. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief introduction will be given below to the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0015] Figure 1 A schematic diagram of the three-dimensional structure of a pressure pulsation vibration reduction structure for a turbine blade provided in one embodiment of the present application;

[0016] Figure 2A schematic diagram of a cross-sectional structure of a pressure pulsation vibration reduction structure for a turbine blade provided in one embodiment of the present application;

[0017] Figure 3 A schematic diagram of the structure of the connection column and the fixing rod of the pressure pulsation vibration reduction structure for the turbine blade provided in one embodiment of the present application;

[0018] Figure 4 A schematic diagram of the threaded barrel and sleeve structure of a pressure pulsation vibration reduction structure for a turbine blade provided in one embodiment of the present application;

[0019] Figure 5 A schematic diagram of a connecting ring structure for a pressure pulsation damping structure for a turbine blade according to an embodiment of the present application;

[0020] Figure 6 A schematic diagram of a clamping sleeve structure for a pressure pulsation vibration reduction structure for a turbine blade provided in one embodiment of the present application;

[0021] Description of Figure Numbers:

[0022] 1. Fixed cylinder; 11. First chute;

[0023] 2. Protective cover;

[0024] 3. Fixing rod; 31. Guide hole;

[0025] 4. Connecting column; 41. Connecting plate; 42. Slider; 43. Guide rod;

[0026] 5. First spring;

[0027] 6. Connecting ring; 61. Fixing plate;

[0028] 62, connecting tube; 621, jack;

[0029] 63. Clamping cylinder; 631. Second spring; 632. Clamping block;

[0030] 7. Runner blades;

[0031] 8. Sleeve; 81. Threaded barrel; 82. Slide pin; 83. Second slide groove; 84. Nut. DETAILED DESCRIPTION

[0032] To make the purpose, technical solutions, and advantages of the embodiments of this application more clear, the technical solutions in the embodiments of this application are clearly and completely described below. Obviously, the described embodiments are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts also fall within the scope of protection of this application.

[0033] It should be noted that in the description of this application, the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on this application.

[0034] The terms "mounted," "connected," and "connected" in this application should be interpreted broadly. For example, they can refer to fixed, detachable, or integral connections; mechanical connections; direct connections or indirect connections through an intermediary; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on specific circumstances.

[0035] In the embodiments of this application, words such as "exemplary" or "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described as "exemplary" or "for example" in the embodiments of this application should not be interpreted as being preferred or advantageous over other embodiments or designs. Rather, the use of words such as "exemplary" or "for example" is intended to present the relevant concepts in a concrete manner.

[0036] This embodiment provides a pressure pulsation vibration reduction structure for a turbine blade, see Figure 1-Figure 5 As shown, it includes a fixed cylinder 1, a protective cover 2 is provided on the upper end of the fixed cylinder 1, a first sliding groove 11 is opened on the side wall of the fixed cylinder 1, a fixed rod 3 is provided in the fixed cylinder 1, a connecting column 4 is provided above the fixed rod 3, the connecting column 4 and the fixed rod 3 are connected by a first spring 5, the outer ring wall of the connecting column 4 is connected to one end of the connecting plate 41, the other end of the connecting plate 41 is connected to one end of the slider 42, the slider 42 is slidably connected to the first sliding groove 11, the other end of the slider 42 is connected to the inner ring wall of the connecting ring 6, and the outer ring wall of the connecting ring 6 is connected to the runner blade 7.

[0037] In the above embodiment, the fixed cylinder 1 is hollow and a first slide groove 11 is provided on the side wall of the fixed cylinder 1. The first slide groove 11 is used to limit the movement of the slider 42 in the setting direction of the first slide groove 11. A fixed rod 3 is fixedly connected in the fixed cylinder 1. A cylindrical connecting column 4 is provided above the fixed rod 3. The connecting column 4 is inserted into the fixed cylinder 1. The outer ring wall of the connecting column 4 is connected to one end of the connecting plate 41. The other end of the connecting plate 41 is connected to one end of the slider 42 to limit the movement of the connecting column 4 in the fixed cylinder 1 along the setting direction of the first slide groove 11. The other end of the slider 42 is connected to the inner ring wall of the connecting ring 6. The connecting ring 6 is sleeved on the outer ring of the fixed cylinder 1. The outer ring wall of the connecting ring 6 is connected to the runner blade 7. The connecting column 4 and the fixed rod 3 are connected by a first spring 5. In the initial state, the water flow pushes the runner blade 7 to rotate. The first spring 5 is in an extended state. When the runner blade 7 is impacted by the pulsation of the water flow, the pushing impact force of the water on the runner blade 7 will increase in a short time. Figure 1 and Figure 2 For example, the downward impact on the runner blades 7 drives the connecting ring 6 downward, which in turn drives the connecting column 4 connected to the connecting ring 6 downward within the fixed cylinder 1. This compresses the first spring 5 between the connecting column 4 and the fixed rod 3, converting part of the water flow's impact force on the runner blades 7 into elastic potential energy of the first spring 5, thereby reducing the impact force on the runner blades 7. Furthermore, the compression of the first spring 5 by the runner blades 7 prolongs the contact time between the water flow's impact force and the runner blades 7, reducing the energy transfer rate per unit time from the water flow's impact force to the runner blades 7. This reduces the instantaneous impact force on the runner blades 7 and the amplitude of the pressure pulsation experienced by the runner blades 7, thereby improving the operational stability of the turbine blades. Furthermore, connecting multiple runner blades 7 to the outer ring of the same connecting ring 6 allows them to maintain synchronization during movement, preventing the runner blades 7 from experiencing varying degrees of offset during movement and buffering, thus improving the operational stability of the turbine blades.

[0038] In one embodiment of the present application, see Figure 1 As shown, the protective cover 2 is configured in a conical shape.

[0039] In the above embodiment, the protective cover 2 provided at the upper end of the fixed cylinder 1 is used to protect the internal components of the fixed cylinder 1 from being damaged by direct impact of the water flow. The top cover adopts a conical design with smooth side walls, which can reduce the resistance of the water flow passing through the protective cover 2, thereby avoiding the collision of the water flow with the front end of the protective cover 2 to form a vortex, which is beneficial to improving the stability of the operation of the runner blades 7.

[0040] In one embodiment of the present application, see Figure 3 As shown, one end of the first spring 5 is sleeved with the upper end of the fixing rod 3 , and the other end of the first spring 5 is sleeved with the lower end of the connecting column 4 .

[0041] In the above embodiment, one end of the first spring 5 is socketed with the upper end of the fixing rod 3, and the other end of the first spring 5 is socketed with the lower end of the connecting column 4. The socketing of the first spring 5 with the fixing rod 3 and the connecting column 4 increases the connection area of ​​the first spring 5, which is beneficial to improving the connection stability of the first spring 5.

[0042] In one embodiment of the present application, see Figure 2 and Figure 3 As shown, the bottom end of the connecting column 4 is connected to a guide rod 43 , the upper end of the fixing rod 3 is provided with a guide hole 31 , and the guide rod 43 is inserted into the guide hole 31 .

[0043] In the above embodiment, the guide rod 43 connected to the bottom end of the connecting column 4 is plugged into the guide hole 31 opened at the upper end of the fixing rod 3 to guide the movement of the connecting column 4. Figure 2 For example, the connecting column 4 is kept vertical during the downward movement process to improve the stability of the connecting column 4 when moving.

[0044] In one embodiment of the present application, see Figure 5 As shown, the outer wall of the connecting ring 6 is connected to a fixing plate 61, and a connecting tube 62 is fixedly connected to one side of the outer wall of the fixing plate 61. A clamping tube 63 is inserted into the inside of the connecting tube 62, and one end of the clamping tube 63 is fixedly connected to one end of the second spring 631, and the other end of the second spring 631 is connected to the clamping block 632. A socket 621 is provided on the side wall of the connecting tube 62, and the socket 621 is used to dock with the clamping block 632. The other end of the clamping tube 63 is connected to the side of the runner blade 7.

[0045] In the above embodiment, the outer wall of the connecting ring 6 is fixedly connected to the fixing plate 61, and one side of the outer wall of the fixing plate 61 is fixedly connected to the connecting tube 62. A socket 621 is provided on the side wall of the connecting tube 62, and the socket 621 is used to dock with the clamping block 632. A clamping tube 63 is inserted into the inside of the connecting tube 62, and one end of the clamping tube 63 is fixedly connected to the second spring 631.

[0046] like Figure 6 As shown, one end of the second spring 631 is connected to the clamping tube 63, and the other end of the second spring 631 is connected to the blocking block 632. When the clamping tube 63 is plugged into the connecting tube 62, the second spring 631 is in an extended state, and the blocking block 632 is inserted into the socket 621 for blocking. When the runner blade 7 needs to be replaced, the blocking block 632 can be pushed into the socket 621. The blocking block 632 will squeeze the second spring 631 inside the clamping tube 63 until the blocking block 632 is disengaged from the socket 621 and retracted into the inside of the clamping tube 63. The clamping tube 63 can be pulled out to realize the disassembly of the runner blade 7. Compared with the fixedly connected runner blade 7, the disassembly is more flexible and convenient for the repair and maintenance of the runner blade 7.

[0047] In one embodiment of the present application, see Figure 1 As shown, the lower end surface of the fixed cylinder 1 is connected with a sleeve 8.

[0048] In the above embodiment, the sleeve 8 connected to the lower end surface of the fixing cylinder 1 is used to connect the fixing cylinder 1 to the rotating shaft of the turbine, drive the turbine to rotate, and drive the generator to generate electricity.

[0049] In one embodiment of the present application, see Figure 1 and Figure 4 As shown, the inner wall of the sleeve 8 is slidably connected to a threaded cylinder 81, and a limiting component is provided on the outer wall of the threaded cylinder 81. The limiting component includes a sliding pin 82, one end of the sliding pin 82 is fixedly connected to the outer wall of the threaded cylinder 81, a second sliding groove 83 is provided on the side wall of the sleeve 8, and a nut 84 is threadedly connected to the outer wall of the threaded cylinder 81.

[0050] In the above embodiment, the inner wall of the sleeve 8 is slidingly connected with a threaded barrel 81, and the threaded barrel 81 can be pulled outward along the inner wall of the sleeve 8. A limiting component is provided on the outer wall of the threaded barrel 81, and the limiting component is used to prevent the threaded barrel 81 from sliding out of the sleeve 8. The limiting component includes a sliding pin 82, and one side of the outer wall of the sliding pin 82 is fixedly connected to the outer wall of the threaded barrel 81. A second sliding groove 83 is provided inside the sleeve 8. The threaded barrel 81 can be pulled to a suitable position by sliding through the sliding pin 82 and the second sliding groove 83, and the outer wall of the threaded barrel 81 is threadedly connected with a nut 84, which is beneficial to improving the adaptability and flexibility of the connection and installation between the fixed barrel 1 and the turbine.

[0051] In the actual use of this application: the water flow drives the runner blades 7 to rotate. When the water flow is too large and impacts the runner blades 7, a pressure pulse is generated on the runner blades 7. Figure 1 For example, the runner blades 7, under impact pressure, move downward, thereby driving the connecting ring 6 downward. This in turn drives the slider 42 downward within the first slot 11. As the slider 42 slides downward, it also presses the connecting post 4 downward. At this point, the guide rod 43 engages the guide hole 31, ensuring stable downward pressure on the connecting post 4. As the connecting post 4 moves downward, it compresses the first spring 5, converting some of the impact kinetic energy into the spring's elastic potential energy. This means that when the runner blades 7 are impacted and the first spring 5 is compressed, the contact time between the water's impact force and the runner blades 7 is prolonged, reducing the energy transfer rate per unit time. This reduces the instantaneous impact force on the runner blades 7 and the amplitude of the pressure pulsation experienced by the runner blades 7. The compression work of the first spring 5 converts some of the water's impact force on the runner blades 7 into the elastic potential energy of the first spring 5, thereby reducing the impact force experienced by the runner blades 7 and improving the operational stability of the turbine blades.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the above embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the above embodiments, or make equivalent replacements for some or all of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.

Claims

1. A pressure pulsation damping structure for a turbine blade, characterized in that: The invention comprises a fixed cylinder (1), wherein a protective cover (2) is provided at the upper end of the fixed cylinder (1), a first sliding groove (11) is provided on the side wall of the fixed cylinder (1), a fixed rod (3) is provided in the fixed cylinder (1), a connecting column (4) is provided above the fixed rod (3), the connecting column (4) and the fixed rod (3) are connected via a first spring (5), the outer ring wall of the connecting column (4) is connected to one end of a connecting plate (41), the other end of the connecting plate (41) is connected to one end of a slider (42), the slider (42) is slidably connected to the first sliding groove (11), the other end of the slider (42) is connected to the inner ring wall of a connecting ring (6), and the outer ring wall of the connecting ring (6) is connected to a runner blade (7).

2. The pressure pulsation damping structure for a turbine blade according to claim 1, characterized in that: The protective cover (2) is arranged in a conical shape.

3. The pressure pulsation damping structure for a turbine blade according to claim 1, characterized in that: One end of the first spring (5) is sleeved with the upper end of the fixing rod (3), and the other end of the first spring (5) is sleeved with the lower end of the connecting column (4).

4. The pressure pulsation damping structure for a hydraulic turbine blade according to claim 3, characterized in that: The bottom end of the connecting column (4) is connected to a guide rod (43), the upper end of the fixing rod (3) is provided with a guide hole (31), and the guide rod (43) is inserted into the guide hole (31).

5. The pressure pulsation damping structure for a water turbine blade according to claim 1, characterized in that: The outer wall of the connecting ring (6) is connected to a fixing plate (61), and a connecting tube (62) is fixedly connected to one side of the outer wall of the fixing plate (61). A clamping tube (63) is inserted into the interior of the connecting tube (62), and one end of the clamping tube (63) is fixedly connected to one end of a second spring (631), and the other end of the second spring (631) is connected to a clamping block (632). A socket (621) is provided on the side wall of the connecting tube (62), and the socket (621) is used to connect with the clamping block (632). The other end of the clamping tube (63) is connected to the side of the runner blade (7).

6. The pressure pulsation damping structure for a turbine blade according to any one of claims 1 to 5, characterized in that: The lower end surface of the fixed cylinder (1) is connected to a sleeve (8).

7. The pressure pulsation damping structure for a hydraulic turbine blade according to claim 6, characterized in that: The inner wall of the sleeve (8) is slidably connected to a threaded cylinder (81), and the outer wall of the threaded cylinder (81) is provided with a limiting assembly, the limiting assembly including a sliding pin (82), one end of the sliding pin (82) is fixedly connected to the outer wall of the threaded cylinder (81), a second sliding groove (83) is provided on the side wall of the sleeve (8), and the outer wall of the threaded cylinder (81) is threadedly connected to a nut (84).

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