Drilling auxiliary tool for guide vane hole of bottom ring of water turbine

Abstract

The utility model relates to a drilling auxiliary tool for a guide vane hole of a bottom ring of a water turbine. The drilling auxiliary tool for the water turbine bottom ring guide vane hole comprises a drill bit which is connected with a motor through a drill bit guide rod, and further comprises a flange cover, the guide hole is formed in the flange cover and allows the drill bit guide rod to pass through; wherein the guide hole is formed by avoiding a bolt hole in the flange cover, and the drill bit guide rod penetrates through the guide hole and then is limited in the guide hole to rotate. The guide hole is formed in the flange cover, the drill bit guide rod penetrates through the guide hole and then is limited to rotate in the guide hole, and therefore the drill bit is prevented from shaking in the drilling process, eccentricity of a drilled hole is prevented, and the drilling precision is improved.

Description

Technical Field

[0001] The present application relates to the technical field of water turbines, and in particular to a drilling auxiliary tool for guide vane holes in a bottom ring of a water turbine. Background Art

[0002] A water turbine is a power machine that converts the energy of water flow into rotational mechanical energy. It belongs to the turbine machinery in fluid machinery. As early as around 100 BC, the prototype of a water turbine, the water wheel, appeared in China, which was used for irrigation and driving grain processing equipment. Most modern water turbines are installed in hydropower stations to drive generators to generate electricity. In a hydropower station, water from the upstream reservoir is led to the water turbine through a water diversion pipe, which drives the turbine runner to rotate and drives the generator to generate electricity. The water that has done work is discharged downstream through the tailwater pipe. The higher the head and the greater the flow, the greater the output power of the water turbine. Water turbines and auxiliary machines are important hydropower equipment, an indispensable part of the hydropower industry, and important equipment for making full use of clean and renewable energy to achieve energy conservation and emission reduction and reduce environmental pollution.

[0003] The turbine is composed of a volute, guide vanes, runner, main shaft, bearing and tailwater pipe. The turbine bottom ring refers to the component used to fix the lower end of the guide vanes.

[0004] When drilling the pin hole in the guide vane hole of the turbine bottom ring, since the drill bit guide rod of the drilling rig is close to 1m in length, it is easy to shake during the drilling process, causing the drill hole to be eccentric, resulting in a decrease in drilling accuracy. Utility Model Content

[0005] In order to solve or partially solve the problems existing in the related art, the present application provides a drilling auxiliary tool for the guide vane holes of the bottom ring of a turbine.

[0006] To achieve the above objectives, this application is implemented through the following technical solutions:

[0007] A drilling auxiliary tool for a guide vane hole of a bottom ring of a water turbine, comprising a drill bit, wherein the drill bit is connected to a motor through a drill bit guide rod, and the drilling auxiliary tool for a guide vane hole of a bottom ring of a water turbine further comprises:

[0008] Flange cover;

[0009] A guide hole is provided on the flange cover and allows the drill guide rod to pass through;

[0010] The guide hole is arranged to avoid the bolt hole on the flange cover, and the drill guide rod is restricted to rotate in the guide hole after passing through the guide hole.

[0011] Optionally, the outer ring sleeve of the flange cover is provided with a flexible rubber layer.

[0012] Optionally, the surface of the flexible rubber layer is provided with patterns or is densely covered with rubber particles.

[0013] Optionally, a bearing is installed in the guide hole, and the outer ring of the bearing is fixedly connected to the inner wall of the guide hole.

[0014] Optionally, the inner ring of the bearing allows the drill guide rod to pass through, and the drill guide rod is restricted to rotate within the inner ring after passing through the inner ring of the bearing.

[0015] Optionally, the drilling auxiliary tool for the guide vane hole of the turbine bottom ring is entirely treated for rust prevention.

[0016] Beneficial effects of the present application: The present application provides a guide hole on the flange cover so that the drill guide rod is restricted from rotating in the guide hole after passing through the guide hole, thereby avoiding shaking of the drill bit during the drilling process, thereby preventing eccentricity of the drilling and improving the drilling accuracy.

[0017] It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The above and other objects, features and advantages of the present application will become more apparent through a more detailed description of exemplary embodiments of the present application in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments of the present application.

[0019] Figure 1 is a top view of the drilling auxiliary tool shown in the first embodiment of the present application;

[0020] Figure 2 is a side view of the drilling auxiliary tool shown in the first embodiment of the present application;

[0021] Figure 3 is a top view of the drilling auxiliary tool shown in the second embodiment of the present application;

[0022] Figure 4 This is a top view of the drilling auxiliary tool shown in Example 3 of the present application.

[0023] Reference numerals: 1 flange cover, 2 guide hole, 3 flexible rubber layer, 4 bearing. DETAILED DESCRIPTION

[0024] In the description of the present invention, it is to be understood that the terms “center”, “longitudinal”, “lateral”, “length”, “width”, “thickness”, “up”, “down”, “front”, “back”, “left”, “right”, “vertical”, “horizontal”, “top”, “bottom”, “inside”, “outside”, “clockwise”, “counterclockwise”, “axial”, “radial”, “circumferential”, etc., indicating orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, are only for the convenience of describing the present invention 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 limiting the present invention.

[0025] 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. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0026] In the present invention, 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 one; it can be a mechanical connection, an electrical connection, or communication with each other; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to the specific situation.

[0027] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0028] In the present invention, the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" etc. mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, unless they are contradictory.

[0029] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

[0030] The above description is only an optional embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

[0031] In order to make the purpose, technical solutions and beneficial effects of the present application clearer, the preferred embodiments of the present application will be described in detail below in conjunction with the accompanying drawings to facilitate understanding by technical personnel.

[0032] Embodiment 1:

[0033] See also Figure 1 and Figure 2 , a drilling auxiliary tool for a guide vane hole of a bottom ring of a water turbine, comprising a drill bit, the drill bit being connected to a motor via a drill bit guide rod, the drilling auxiliary tool for a guide vane hole of a bottom ring of a water turbine further comprising:

[0034] Flange cover 1;

[0035] A guide hole 2 is provided on the flange cover 1 and allows the drill guide rod to pass through;

[0036] The guide hole 2 is arranged to avoid the bolt hole on the flange cover 1 , and the drill guide rod is restricted to rotate in the guide hole 2 after passing through the guide hole 2 .

[0037] In this embodiment, a portion of the flange cover 1 close to the outer ring is provided with a plurality of bolt holes, and the guide holes 2 are arranged away from the bolt holes to avoid the bolt holes causing the guide holes 2 to have an irregular shape or the edges of the guide holes 2 to be fragile; the flange cover 1 is selected according to the size of the guide vane hole, and the outer diameter of the flange cover 1 matches the inner diameter of the guide vane hole of the bottom ring, so that the flange cover 1 can be embedded in the guide vane hole;

[0038] When in use, the flange cover 1 is embedded and fixed in the guide vane hole, the guide hole 2 is aligned with the position where the pin hole needs to be drilled, the drill guide rod is passed through the guide hole 2, the drill bit at the end of the drill guide rod is aligned with the position of the pin hole, the motor is started, and the drill guide rod drives the drill bit to rotate synchronously in the guide hole 2 to drill the pin hole in the guide vane hole;

[0039] In this embodiment, a guide hole 2 is opened on the flange cover 1 so that the drill guide rod is restricted from rotating in the guide hole 2 after passing through the guide hole 2, thereby avoiding shaking of the drill bit during the drilling process, thereby preventing eccentricity of the drill hole and improving the drilling accuracy.

[0040] In this embodiment, the outer diameter of the flange cover 1 is selected to be 30 cm, and the diameter of the guide hole 2 is selected according to the size of the pin hole. Taking the diameter of the pin hole as 60 mm as an example, the diameter of the guide hole 2 is Φ62 mm.

[0041] Embodiment 2:

[0042] See also Figure 3 Based on the first embodiment, further and optionally, the outer ring of the flange cover 1 is provided with a flexible rubber layer 3 .

[0043] Specifically, the selection of the flexible rubber layer 3 is determined according to the size of the guide vane hole, and the outer diameter of the flexible rubber layer 3 matches the inner diameter of the guide vane hole of the bottom ring, so that the flexible rubber layer 3 and the flange cover 1 can be embedded in the guide vane hole;

[0044] When the drill bit rotates, it will impact the guide hole 2. A flexible rubber layer 3 is sleeved on the outer ring of the flange cover 1 to absorb the impact, thereby protecting the flange cover 1 and improving the service life of the device. At the same time, compared with the direct fit and fixation of the flange cover 1 and the guide vane hole, the friction generated by the flexible rubber layer 3 and the inner wall of the guide vane hole is greater. The large friction can better fix the position of the flange cover 1 and reduce the movement of the flange cover 1 caused by vibration, thereby making the position of the drill bit more stable during the drilling process and further improving the drilling accuracy.

[0045] Further and optionally, the surface of the flexible rubber layer 3 is provided with patterns or is densely covered with rubber particles.

[0046] Specifically, the surface of the flexible rubber layer 3 is provided with patterns or densely covered with rubber particles, which can further increase the friction between the flexible rubber layer 3 and the inner wall of the guide vane hole, and further improve the stability of the flange cover 1 during the drilling process.

[0047] Embodiment three:

[0048] See also Figure 4 Based on the above embodiment, further and optionally, a bearing 4 is installed in the guide hole 2, and the outer ring of the bearing 4 and the inner wall of the guide hole 2 are fixedly connected.

[0049] Specifically, in this embodiment, the size of the bearing 4 is selected according to the aperture size of the pin hole. The inner ring of the bearing 4 is slightly larger than the aperture of the pin hole. For example, if the aperture of the pin hole is 60 mm, the inner ring diameter of the bearing 4 is Φ62 mm. The inner diameter of the guide hole 2 matches the outer ring diameter of the bearing 4 to facilitate the installation of the bearing 4 in the guide hole 2.

[0050] Further and optionally, the inner ring of the bearing 4 allows the drill guide rod to pass through, and the drill guide rod is restricted to rotate within the inner ring after passing through the inner ring of the bearing 4.

[0051] Specifically, when in use, the flange cover 1 is embedded and fixed in the guide vane hole through the flexible rubber layer 3, the guide hole 2 is aligned with the position where the pin hole needs to be drilled, the drill guide rod is passed through the inner ring of the bearing 4, the drill bit at the end of the drill guide rod is overlapped with the position of the pin hole, the motor is started, and the drill guide rod drives the drill bit to rotate synchronously in the inner ring of the bearing 4 to drill the pin hole in the guide vane hole;

[0052] In this embodiment, by installing the bearing 4 in the guide hole 2, the drill guide rod is restricted to rotate in the inner ring after passing through the inner ring of the bearing 4, thereby avoiding the drill bit from shaking during the drilling process, thereby preventing the drilling from being eccentric. When the drill guide rod hits the inner ring of the bearing 4, it can drive it to rotate, thereby avoiding the drill guide rod from causing wear on the inner wall of the guide hole 2 during the drilling process; when the inner ring of the bearing 4 is excessively worn, only a new bearing 4 needs to be replaced.

[0053] Further and optionally, the drilling auxiliary tool for the guide vane hole of the turbine bottom ring is entirely subjected to rust-proof treatment.

[0054] Specifically, rust prevention treatment is used to prevent iron components or devices from forming iron oxide surface protection; it can be achieved by coating, surface treatment, electroplating, chemicals, cathode rust prevention treatment or other methods. By doing rust prevention treatment, the corrosion resistance of the device is improved and the service life of the device is increased.

[0055] To summarize, the present application provides a guide hole 2 on the flange cover 1, so that the drill guide rod is restricted to rotate in the guide hole 2 after passing through the guide hole 2, thereby avoiding the drill bit from shaking during the drilling process, thereby preventing the drill hole from being eccentric and improving the drilling accuracy; when the drill bit of the present application rotates, it will impact the guide hole 2, and a flexible rubber layer 3 is provided on the outer ring of the flange cover 1 to absorb the impact, thereby protecting the flange cover 1 and thus improving the service life of the device; at the same time, compared with the direct engagement and fixation of the flange cover 1 and the guide vane hole, the friction force generated by the flexible rubber layer 3 and the inner wall of the guide vane hole is greater The large friction force can better fix the position of the flange cover 1 and reduce the movement of the flange cover 1 caused by vibration, so that the position of the drill bit in the drilling process is more stable, and the drilling accuracy is further improved; the present application provides patterns or densely distributes rubber particles on the surface of the flexible rubber layer 3, which can further increase the friction between the flexible rubber layer 3 and the inner wall of the guide vane hole, and further improve the stability of the flange cover 1 during the drilling process; the present application installs a bearing 4 in the guide hole 2, so that the drill guide rod is restricted to rotate in the inner ring after passing through the inner ring of the bearing 4, thereby avoiding the drill guide rod from causing wear to the inner wall of the guide hole 2 during the drilling process.

[0056] Finally, it should be noted that the above preferred embodiments are only used to illustrate the technical solution of the present application rather than to limit it. Although the present application has been described in detail through the above preferred embodiments, those skilled in the art should understand that various changes can be made in form and details without departing from the scope defined by the claims of the present application; the dimensions of the drawings are not related to the specific objects, and the dimensions of the objects can be changed arbitrarily.

Claims

1. A drilling auxiliary tool for a guide vane hole of a bottom ring of a turbine, comprising a drill bit, the drill bit being connected to a motor through a drill bit guide rod, characterized in that: The drilling auxiliary tool for the guide vane hole of the bottom ring of the turbine also includes: Flange cover (1); A guide hole (2) is formed on the flange cover (1) and allows the drill guide rod to pass through; The guide hole (2) is arranged to avoid the bolt hole on the flange cover (1), and the drill guide rod is restricted to rotate in the guide hole (2) after passing through the guide hole (2).

2. The drilling auxiliary tool for the guide vane hole of the bottom ring of a turbine according to claim 1, characterized in that: The outer ring of the flange cover (1) is provided with a flexible rubber layer (3).

3. The drilling auxiliary tool for the guide vane hole of the bottom ring of a turbine according to claim 2, characterized in that: The surface of the flexible rubber layer (3) is provided with patterns or is densely covered with rubber particles.

4. The drilling auxiliary tool for guide vane holes in the bottom ring of a turbine according to claim 1, characterized in that: A bearing (4) is installed in the guide hole (2), and the outer ring of the bearing (4) is fixedly connected to the inner wall of the guide hole (2).

5. The drilling auxiliary tool for guide vane holes of a turbine bottom ring according to claim 4, characterized in that: The inner ring of the bearing (4) allows the drill guide rod to pass through, and after the drill guide rod passes through the inner ring of the bearing (4), it is restricted to rotate within the inner ring.

6. The drilling auxiliary tool for guide vane holes of a turbine bottom ring according to any one of claims 1 to 5, characterized in that: The drilling auxiliary tool for the guide vane hole of the turbine bottom ring is entirely rust-proofed.

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