Impact turbine guide ring structure and method thereof

Abstract

The invention discloses a flow guide ring structure of an impulse turbine and a method thereof, the flow guide ring structure comprises a runner cone connected with a shell, the large diameter of the runner cone is upward, and a flow guide cylinder is detachably connected below the runner cone; and when the guide cylinder and the runner cone are disconnected, the runner cone can move up and down in the axial range of the guide cylinder. According to the installation method, the runner cone can be placed on the outer chamfer of the cylinder during installation, the height of the flow guide ring can be reduced, the lifting frequency of the flow guide ring is reduced, the whole structure of the flow guide ring is lifted and transported to the center of a machine shell at a time, the installation difficulty is effectively reduced, and the installation efficiency is improved. According to the maintenance method, the runner cone of the flow guide ring directly falls on the premise that the rotating wheel is not disassembled, enough space for people to enter is provided between the machine shell and the runner cone, operation is efficient, the disassembly construction period and the reassembly construction period during maintenance are effectively shortened, and the maintenance efficiency is greatly improved.

Description

Technical Field

[0001] The invention relates to the technical field of water turbines, in particular to an impulse water turbine guide ring structure and a method thereof. Background Art

[0002] The safe and stable operation of water-guided bearings is an important guarantee for the safe and stable operation of water turbine units. In order to ensure the safe and stable operation of the unit, it is necessary to frequently remove the guide ring to inspect the status of the water-guided bearings, such as whether the oil drain port at the bottom of the water-guided bearing is leaking, whether the water-guided bearing seal needs to be replaced, and whether the water-guided bearing air supply metal hose is damaged.

[0003] The guide ring is an important part of the impulse turbine. During the operation of the impulse turbine unit, the guide ring and the casing form a closed space to guide the water flow into the downstream tailwater pipe, while preventing the water flow from impacting the main shaft flange end face and splashing the water guide bearing. Since the jet of the impulse turbine is a sandy water flow, coupled with the negative pressure generated by the rotation of the main shaft, small particles of impurities such as mud and sand will inevitably be sucked into the space between the main shaft and the guide ring from the bottom of the guide ring, colliding with the rotating main shaft, generating noise, and even larger particles will be stuck in the gap between the guide ring and the main shaft, wearing the main shaft surface. At the same time, there are a large number of pipelines and bolt mating surfaces between the guide ring and the water guide bearing. The bolts and nuts that fall when the unit is running will also enter the space between the guide ring and the main shaft and collide with the main shaft. These inspections require the frequent removal of the guide ring.

[0004] At present, the existing impulse turbine guide rings mostly adopt an integral structure. During maintenance, the turbine runner must be removed first, and then the guide ring cylinder is removed, and then the drain cone is removed from the machine base. This maintenance method is not only cumbersome to remove, but also takes a lot of time to reinstall after the maintenance is completed, resulting in a long removal and installation period during maintenance and huge maintenance costs. Summary of the invention

[0005] The object of the present invention is to provide a guide ring structure of an impulse turbine and an installation method and a maintenance method thereof in order to solve the above-mentioned problems, so as to effectively shorten the maintenance cycle and realize simple and efficient operation.

[0006] The technical solution adopted by the present invention is as follows:

[0007] A guide ring structure for an impulse turbine comprises a water discharge cone connected to a casing, wherein the major diameter of the water discharge cone faces upward and a guide tube is detachably connected to the bottom of the water discharge cone; when the connection between the guide tube and the water discharge cone is disconnected, the water discharge cone can move up and down within the axial range of the guide tube.

[0008] Optionally, the drain cone is composed of at least two cone-petal units.

[0009] Optionally, petal dividing surfaces are provided on both sides of each cone-petal unit, and two adjacent cone-petal units are butted against each other via the petal dividing surfaces.

[0010] Optionally, the petal dividing surface is located on the inner side of the cone-petal unit.

[0011] Optionally, the upper and lower parts of the guide tube are respectively provided with limiting parts for limiting the upward and downward movement of the water discharge cone.

[0012] Optionally, a first connecting portion is provided at the bottom of the water discharge cone, and a second connecting portion is provided at the top of the guide tube, and the first connecting portion and the second connecting portion are connected by a connecting piece.

[0013] Optionally, the first connecting part has an upper plane, the second connecting part has a lower plane, the first connecting part is located above the second connecting part, the upper plane supports the lower plane, and the connecting member passes through the first connecting part and the second connecting part upward in sequence.

[0014] Optionally, the bottom of the water discharge cone has an inner chamfer, and the bottom of the guide tube has an outer chamfer.

[0015] Optionally, the inner chamfer and the outer chamfer have the same slope.

[0016] A method for installing a guide ring structure of an impulse turbine comprises the following steps:

[0017] Step 1: Sleeve the cone-valve unit on the outer circumference of the guide tube;

[0018] Step 2, closing and connecting the multi-petal cone-petal units into one;

[0019] Step 3: Place the guide ring on the transport trolley through the hanging hole, and transport the trolley to the center of the casing through the rotating wheel transport channel;

[0020] Step 4: Use a hand chain hoist to connect the upper part of the drain cone to the top of the casing through the eye screws, lift the drain cone upward, and fix the bottom of the drain cone and the top of the guide tube;

[0021] Step 5. Use a hand chain hoist to connect the trolley to the eye screws on the top of the casing through the eye screws;

[0022] Step 6. Finally, use the hand hoist to lift the trolley and guide ring to the final position and fix them, and remove the lifting tool and hand hoist.

[0023] During installation, the drain cone can be placed on the outer chamfer of the cylinder, which can reduce the height of the guide ring; reduce the number of times the guide ring is hoisted, and the entire structure of the guide ring can be hoisted and transported to the center of the casing at one time, effectively reducing the difficulty of installation and improving installation efficiency.

[0024] A method for repairing a guide ring structure of an impulse turbine comprises the following steps:

[0025] Step 1: Remove the connection between the drain cone and the guide tube and the connection between the drain cone and the casing;

[0026] Step 2: Use the lifting tool to drop the drain cone to the bottom of the guide tube. At this time, the guide ring is at a certain distance from the top of the casing, and the maintenance personnel can enter the guide ring for maintenance;

[0027] Step 3: After the inspection and maintenance is completed, install the guide ring to the casing.

[0028] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0029] 1. The guide ring structure of an impulse turbine provided by the present invention is convenient and efficient to operate, can effectively simplify the installation and maintenance procedures of the guide ring, and shorten the maintenance cycle.

[0030] 2. The present invention provides an installation method for an impulse turbine guide ring structure. During installation, the drain cone can be placed on the outer chamfer of the cylinder, which can reduce the height of the guide ring and the number of times the guide ring is hoisted. The entire guide ring structure can be hoisted and transported to the center of the casing at one time, effectively reducing the difficulty of installation and improving installation efficiency.

[0031] 3. The present invention provides a maintenance method for the guide ring structure of an impulse turbine. The drain cone of the guide ring is directly dropped without removing the runner, providing sufficient entry space between the casing and the drain cone. The operation is efficient, and the dismantling construction period and the reinstallation construction period during maintenance are effectively shortened, thereby greatly improving the maintenance efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] The present invention will now be described by way of example with reference to the accompanying drawings, in which:

[0033] Figure 1 The present invention is a layout diagram of the guide ring structure of an impulse turbine.

[0034] Figure 2 The present invention is a structural schematic diagram of a guide ring structure of an impulse turbine.

[0035] Figure 3 is a schematic diagram of the cone-valve unit.

[0036] Figure 4 It is a schematic diagram of the connection between the discharge cone and the guide tube.

[0037] Figure 5 This is a schematic diagram of the installation method of the guide ring structure of the impulse turbine Figure 1 .

[0038] Figure 6 This is a schematic diagram of the installation method of the guide ring structure of the impulse turbine Figure 2 .

[0039] Figure 7 This is a schematic diagram of the installation method of the guide ring structure of the impulse turbine Figure 3 .

[0040] Figure 8 This is a schematic diagram of the installation method of the guide ring structure of the impulse turbine Figure 4 .

[0041] Fig. 9 This is a schematic diagram of the maintenance method of the guide ring structure of the impulse turbine Figure 1 .

[0042] Fig.10 This is a schematic diagram of the maintenance method of the guide ring structure of the impulse turbine Figure 2 .

[0043] Markings in the figure: 1-drainage cone, 2-guide tube, 3-cone petal unit, 4-petal surface, 5-first connecting part, 6-second connecting part, 7-connecting piece, 8-inner chamfer, 9-outer chamfer. DETAILED DESCRIPTION

[0044] The present invention will be described in detail below in conjunction with the accompanying drawings.

[0045] All features disclosed in this specification, or steps in all methods or processes disclosed, except mutually exclusive features and / or steps, can be combined in any manner.

[0046] Any feature disclosed in this specification, unless otherwise stated, can be replaced by other equivalent or alternative features with similar purposes. That is, unless otherwise stated, each feature is only an example of a series of equivalent or similar features.

[0047] A guide ring structure of an impulse turbine, such as Figure 1-4 As shown, it includes a water discharge cone 1 connected to the casing, the major diameter of the water discharge cone 1 faces upward, and a guide tube 2 is detachably connected to the bottom of the water discharge cone 1; when the connection between the guide tube 2 and the water discharge cone 1 is disconnected, the water discharge cone 1 can move up and down within the axial range of the guide tube 2.

[0048] Specifically, the guide ring of the new structure adopts a modular design, which separates the drain cone 1 and the guide tube 2, so that the drain cone 1 or the guide tube 2 can be operated separately during maintenance, reducing the complexity of maintenance. Since the guide tube 2 and the drain cone 1 are detachably connected, when maintenance is required, only the connection part needs to be disassembled to achieve the relative up and down movement of the guide tube 2 and the drain cone 1, without removing the runner, which greatly simplifies the maintenance process. After removing the connection between the drain cone 1 and the casing, the drain cone 1 falls to the bottom of the guide tube 2. At this time, the guide ring is at a certain distance from the top of the casing, and maintenance personnel can enter the guide ring for maintenance.

[0049] As another specific embodiment, the drainage cone 1 is composed of at least two cone-petal units 3. The drainage cone 1 is composed of multiple cone-petal units 3. When it is necessary to inspect the inside of the drainage cone 1 or other components connected thereto, the cone-petal units 3 can be disassembled and assembled individually or in groups without completely disassembling the entire drainage cone 1, which can significantly improve the inspection efficiency. If a cone-petal unit 3 of the drainage cone 1 is damaged, the unit can be replaced individually without replacing the entire drainage cone 1, which can save materials and costs.

[0050] As another specific embodiment, each of the cone-petal units 3 is provided with a petal dividing surface 4 on both sides, and the adjacent cone-petal units 3 are butted against each other through the petal dividing surface 4. The design of the petal dividing surface 4 enables each cone-petal unit 3 to be like a puzzle. Figure 1 The cone-shaped petal units 3 are connected to each other through the petal surface 4, and only need to ensure that each unit is correctly aligned and fixed during installation, which simplifies the overall installation process.

[0051] As another specific implementation, the petal surface 4 is located inside the cone-petal unit 3, ensuring that the outer water flow is smooth and will not be hindered by the petal surface 4 of the water discharge cone 1, thereby improving the water discharge efficiency of the water discharge cone 1.

[0052] As another specific embodiment, the upper and lower parts of the guide tube 2 are respectively provided with limiting parts for limiting the upward and downward movement of the water discharge cone 1. Even when the guide ring is not installed, the guide tube 2 and the water discharge cone 1 are not separated, preventing the water discharge cone 1 from accidentally falling off when the guide ring is not installed, reducing the risk of production safety accidents caused by loose components. The installation and disassembly process becomes simpler and faster, reducing the complex steps during installation. When the water discharge cone 1 needs to be repaired, the limiting part can quickly locate the position of the water discharge cone 1, facilitating maintenance work.

[0053] As another specific embodiment, the bottom of the water discharge cone 1 is provided with a first connection part 5, the top of the guide tube 2 is provided with a second connection part 6, and the first connection part 5 and the second connection part 6 are connected by a connecting piece 7. The water discharge cone 1 and the guide tube 2 are tightly connected by the connecting piece 7, which improves the stability of the entire structure and reduces vibration during operation.

[0054] As another specific embodiment, the first connection part 5 has an upper plane, the second connection part 6 has a lower plane, the first connection part 5 is located above the second connection part 6, the upper plane supports the lower plane, and the connection member 7 passes through the first connection part 5 and the second connection part 6 upward in sequence. The upper plane of the first connection part 5 supports the lower plane of the second connection part 6, forming a stable vertical support structure, which helps to disperse and withstand the pressure and impact from the water flow. The contact area between the upper plane and the lower plane is large, which helps to evenly distribute the force to the two connection parts, reduce local stress concentration, and improve the durability of the structure. When the connection member 7 needs to be replaced or other maintenance work is performed, it can be more easily disassembled and reinstalled due to the installation method of the connection member 7. The first connection part 5 and the second connection part 6 can not only connect the water discharge cone 1 and the guide tube 2, but also limit the up and down movement of the water discharge cone 1, realizing the integration of structure and function and simplifying the overall design. Among them, the second connection part 6 serves as the upper limit part of the guide tube 2.

[0055] As another specific embodiment, the bottom of the water discharge cone 1 has an inner chamfer 8, and the bottom of the guide tube 2 has an outer chamfer 9. The chamfer design can serve as a guide to help the water discharge cone 1 to be accurately aligned and positioned, thereby improving installation accuracy and preventing damage to the water discharge cone 1 and the guide tube 2 during disassembly and installation.

[0056] As another specific implementation, the inner chamfer 8 and the outer chamfer 9 have the same inclination. The matching accuracy between the water discharge cone 1 and the guide tube 2 is improved. Due to the same inclination, the water discharge cone 1 is easier to align with the position of the guide tube 2 during the hoisting process, reducing the difficulty of adjustment and alignment. When the water discharge cone 1 is in place, due to the consistent inclination, it can ensure that the force is evenly distributed in the same direction, reducing the concentrated pressure on a certain part.

[0057] A method for installing a guide ring structure of an impulse turbine comprises the following steps:

[0058] Step 1, sleeve the cone-valve unit 3 on the outer circumference of the guide tube 2;

[0059] Step 2, closing and connecting the multi-petal cone-petal units 3 into one;

[0060] Step 3: Figure 5As shown, place the guide ring on the transport trolley through the hanging hole, and transport the trolley to the center of the casing through the rotating wheel transport channel;

[0061] Step 4: Figure 6 As shown, the upper part of the drain cone 1 is connected to the top eye screw of the casing by a hand chain hoist, and the drain cone 1 is lifted upward to fix the bottom of the drain cone 1 and the top of the guide tube 2;

[0062] Step 5: Figure 7 As shown in the figure, use a hand chain hoist to connect the trolley to the eye screws on the top of the casing through the eye screws;

[0063] Step 6: Figure 8 As shown, finally use a hand chain hoist to lift the trolley and guide ring to the final position and fix them, and remove the lifting tool and hand chain hoist.

[0064] During installation, the drain cone can be placed on the outer chamfer of the cylinder, which can reduce the height of the guide ring; reduce the number of times the guide ring is hoisted, and the entire structure of the guide ring can be hoisted and transported to the center of the casing at one time, effectively reducing the difficulty of installation and improving installation efficiency.

[0065] A method for repairing a guide ring structure of an impulse turbine comprises the following steps:

[0066] Step 1: Fig. 9 As shown, guide rods are installed between the casing and the water discharge cone 1 and between the water discharge cone 1 and the guide cylinder 2, and the connection between the water discharge cone 1 and the guide cylinder 2 and the connection between the water discharge cone 1 and the casing are removed;

[0067] Step 2: Fig.10 As shown in the figure, use the lifting tool to drop the drain cone to the bottom of the guide tube. At this time, the guide ring is at a certain distance from the top of the casing, and the maintenance personnel can enter the guide ring for maintenance;

[0068] Step 3: After the inspection and maintenance is completed, use the guide rod, sleeve, nut and other tools to install the guide ring to the casing, and then remove all tools.

[0069] The drain cone of the guide ring is directly dropped without removing the runner, providing sufficient entry space between the casing and the drain cone. The operation is efficient, effectively shortening the dismantling construction period and the reinstallation construction period during maintenance, greatly improving the maintenance efficiency.

[0070] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The present invention extends to any new features or any new combinations disclosed in this specification, and any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the detailed technical features not disclosed in this embodiment, such as specific structure, connection method, etc., can be obtained by those skilled in the art from the prior art, and the present disclosed embodiment does not specifically limit this.

Claims

1. A guide ring structure for an impulse turbine, characterized in that: A water discharge cone (1) is connected to the casing, the major diameter of the water discharge cone (1) faces upward, and a guide tube (2) is detachably connected to the bottom of the water discharge cone (1); when the connection between the guide tube (2) and the water discharge cone (1) is disconnected, the water discharge cone (1) can move up and down within the axial range of the guide tube (2).

2. The guide ring structure of the impulse turbine according to claim 1, characterized in that: The drainage cone (1) is composed of at least two cone-petal units (3).

3. The guide ring structure of the impulse turbine according to claim 2, characterized in that: Petal dividing surfaces (4) are provided on both sides of each petal of the cone-petal unit (3), and two adjacent petals of the cone-petal units (3) are butt-jointed via the petal dividing surfaces (4).

4. The guide ring structure of the impulse turbine according to claim 3, characterized in that: The petal dividing surface (4) is located on the inner side of the cone petal unit (3).

5. The guide ring structure of the impulse turbine according to claim 1, characterized in that: The upper and lower parts of the guide tube (2) are respectively provided with limiting parts for limiting the upward and downward movement of the drainage cone (1).

6. The guide ring structure of the impulse turbine according to claim 1, characterized in that: A first connecting portion (5) is provided at the bottom of the water discharge cone (1), a second connecting portion (6) is provided at the top of the flow guide tube (2), and the first connecting portion (5) and the second connecting portion (6) are connected via a connecting piece (7).

7. The guide ring structure of the impulse turbine according to claim 6, characterized in that: The first connecting part (5) has an upper plane, the second connecting part (6) has a lower plane, the first connecting part (5) is located above the second connecting part (6), the upper plane supports the lower plane, and the connecting member (7) passes through the first connecting part (5) and the second connecting part (6) in sequence upwards.

8. The guide ring structure of the impulse turbine according to claim 1, characterized in that: The bottom of the water discharge cone (1) has an inner chamfer (8), and the bottom of the guide tube (2) has an outer chamfer (9), and the inner chamfer (8) and the outer chamfer (9) have the same slope.

9. A method for installing a guide ring structure of an impulse turbine, characterized in that: The following steps are involved: Step 1: Sleeve the cone-valve unit on the outer circumference of the guide tube; Step 2, closing and connecting the multi-petal cone-petal units into one; Step 3: Place the guide ring on the transport trolley through the hanging hole, and transport the trolley to the center of the casing through the rotating wheel transport channel; Step 4: Use a hand chain hoist to connect the upper part of the drain cone to the top of the casing through the eye screws, lift the drain cone upward, and fix the bottom of the drain cone and the top of the guide tube; Step 5. Use a hand chain hoist to connect the trolley to the eye screws on the top of the casing through the eye screws; Step 6. Finally, use the hand hoist to lift the trolley and guide ring to the final position and fix them, and remove the lifting tool and hand hoist.

10. A method for repairing a guide ring structure of an impulse turbine, characterized in that: The following steps are involved: Step 1: Remove the connection between the drain cone and the guide tube and the connection between the drain cone and the casing; Step 2: Use the lifting tool to drop the drain cone to the bottom of the guide tube. At this time, the guide ring is at a certain distance from the top of the casing, and the maintenance personnel can enter the guide ring for maintenance; Step 3: After the inspection and maintenance is completed, install the guide ring to the casing.

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