Double-channel self-sand-discharging volute based on water turbine
By designing a dual-channel self-draining volute, the problem of sediment damage to the turbine is solved by utilizing centrifugal force and the Venturi effect, achieving efficient sediment discharge, reducing maintenance frequency and improving conversion efficiency.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-05-08
- Publication Date
- 2026-03-24
AI Technical Summary
The damage caused by sediment in rivers to water turbines leads to reduced conversion efficiency and increased maintenance frequency, and existing sediment separation equipment is not effective.
The design is based on a dual-channel self-draining volute for a water turbine, which uses centrifugal force within the volute to discharge sediment. It includes an inlet pipe, a volute body, first and second self-draining structures, and a tungsten carbide or tungsten carbide cobalt coating, utilizing the Venturi effect to accelerate sediment discharge.
It effectively reduces the impact of mud and sand on the impeller, reduces wear, lowers the frequency of impeller maintenance, and improves conversion efficiency.
Smart Images
Figure CN224032690U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of turbine components, specifically to a dual-channel self-draining volute based on a turbine. Background Technology
[0002] Hydro turbines are commonly used energy conversion devices in power plants, effectively converting water power into mechanical energy and serving as the foundation for hydroelectric power generation. However, in actual use and maintenance, although appropriate sediment deposition structures are in place, sediment carried by rivers inevitably damages the turbines, leading to reduced conversion efficiency and significantly increasing maintenance frequency.
[0003] In order to reduce the frequency of maintenance caused by sediment and maintain the conversion efficiency of water turbines, various hydropower plants are constantly developing various sediment separation equipment. Utility Model Content
[0004] To address the shortcomings of existing technologies, this application provides a dual-channel self-draining volute based on a water turbine, which can automatically discharge sediment through the centrifugal force of water in the volute, greatly reducing the impact of sediment on the impeller. This ensures the rotational performance of the impeller while effectively reducing wear and tear, significantly lowering the maintenance frequency of the impeller.
[0005] The dual-channel self-draining sand volute based on the water turbine includes an inlet pipe, a volute body connected to the inlet pipe, a first self-draining sand structure disposed on the volute body, a second self-draining sand structure disposed on the volute body, and a seat ring fixing platform disposed in a ring shape at the center of the volute body for fixing the water turbine seat ring.
[0006] Preferably, the inner walls of the volute body, the first self-draining sand structure, and the second self-draining sand structure are all coated with tungsten carbide or tungsten carbide cobalt coating; the first self-draining sand structure and the second self-draining sand structure are both arranged along the outer centerline of the volute body.
[0007] Furthermore, the volute body is formed by connecting end to end tapered tubes with gradually decreasing inner diameters. The lowest point of the outer side wall of the volute body is located on the same horizontal plane, and the ratio of the inner diameter of the head to the inner diameter of the tail of the volute body is 2.3:1-2.8:1.
[0008] Furthermore, the first self-draining sand structure consists of a first sand trough located on the inner wall of the volute body and formed by the recess of the inner wall of the volute body, and a first sand pipe connected to the first sand trough.
[0009] Preferably, the first sand groove is connected to the first sand pipe at a position which is 15-30° apart from the head of the volute body in arc length.
[0010] Preferably, the first sand pipe has a ratio of 1.5:1:1.2 between the inlet diameter, the middle section diameter and the tail section diameter, and the diameter of the inlet section gradually decreases to the middle section, and the diameter of the middle section gradually increases to the tail section.
[0011] Further, the second self-sand discharge structure comprises a second sand groove formed on the inner side wall of the volute body and a second sand pipe connected to the second sand groove.
[0012] Preferably, the second sand groove is connected to the second sand pipe at a position which is 195-210° apart from the head of the volute body in arc length, and the second sand groove is connected to the second sand pipe at a position which is 245-260° apart from the head of the volute body in arc length.
[0013] Preferably, the second sand pipe has a ratio of 1.5:1:1.2 between the inlet diameter, the middle section diameter and the tail section diameter, and the diameter of the inlet section gradually decreases to the middle section, and the diameter of the middle section gradually increases to the tail section.
[0014] In addition, the water inlet pipe is provided with a filter screen.
[0015] Compared with the prior art, the embodiment has the following beneficial effects:
[0016] The volute can automatically discharge the silt through the centrifugal force of water, greatly reducing the impact of the silt on the runner, ensuring the rotation effect of the runner, effectively reducing the wear of the runner, and greatly reducing the maintenance frequency of the runner.
[0017] Some of the additional features of the present application can be described in the following description. Some of the additional features of the present application are apparent to those skilled in the art from the following description and corresponding drawings. The features disclosed by the present application can be realized and attained by the practice of various methods, means and combinations of the specific embodiments described in the following description. BRIEF DESCRIPTION OF DRAWINGS
[0018] The drawings described herein are intended to provide further understanding of the present application, and form a part of the present application. The schematic embodiments of the present application and their descriptions are used to explain the present application, and do not constitute a limitation of the present application. In the drawings, the same reference numerals represent the same components. Among them,
[0019] Fig. 1 is a front view of the utility model.
[0020] Fig. 2 is a rear view of the utility model.
[0021] Fig. 3 is a structure schematic view of the utility model cut along the middle line of the volute.
[0022] Explanation of reference signs:
[0023] 100, water inlet pipe;
[0024] 200, volute main body;
[0025] 300, first self-desilting structure;
[0026] 301, first desilting groove; 302, first desilting pipe;
[0027] 400, second self-desilting structure;
[0028] 401, second desilting groove; 402, second desilting pipe;
[0029] 500, seat ring fixing table. DETAILED DESCRIPTION
[0030] In order to make the person skilled in the art better understand the present application scheme, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by the person skilled in the art without creative labor should belong to the scope of protection of the present application.
[0031] It should be noted that if the specification and claims of the present application and the above-mentioned drawings involve the terms "first", "second", etc., they are used to distinguish similar objects, and do not have to be used to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances, so that the embodiments of the present application described herein can be implemented. In addition, if the terms "include" and "have" and any variations thereof are involved, it is intended to cover non-exclusive inclusion, for example, a process, method, system, product or device containing a series of steps or units does not have to be limited to those steps or units clearly listed, but can include other steps or units not clearly listed or inherent to these processes, methods, products or devices.
[0032] In this application, when terms such as "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" are used, they indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.
[0033] Furthermore, in addition to indicating location or positional relationship, some of the aforementioned terms may also have other meanings. For example, the term "above" may also be used in some cases to indicate a certain dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances.
[0034] Furthermore, in this application, the terms "installation," "setup," "equipped with," "connection," "linking," and "socketing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral structure; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium, or an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.
[0035] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.
[0036] Example 1
[0037] like Figs. 1-3 As shown, the dual-channel self-draining sand volute based on the water turbine includes an inlet pipe 100, a volute body 200 connected to the inlet pipe 100, a first self-draining sand structure 300 disposed on the volute body 200, a second self-draining sand structure 400 disposed on the volute body 200, and a seat ring fixing platform 500 disposed in a ring shape at the center of the volute body 200 for fixing the water turbine seat ring.
[0038] The inner walls of the volute body 200, the first self-draining sand structure 300, and the second self-draining sand structure 400 are all coated with tungsten carbide or tungsten carbide cobalt coating; the first self-draining sand structure 300 and the second self-draining sand structure 400 are both arranged along the outer center line of the volute body 200.
[0039] The volute body 200 is formed by the taper tubes with gradually reduced inner diameter connected head to tail, the lowest point of the outer side wall of the volute body 200 is located on the same horizontal plane, and the ratio of the inner diameter of the head to the inner diameter of the tail of the volute body 200 is 2.3:1.
[0040] The first self-sand discharge structure 300 is composed of a first sand discharge groove 301 arranged on the inner side wall of the volute body 200 and formed by the concave of the inner side wall of the volute body 200, and a first sand discharge pipe 302 connected with the first sand discharge groove 301.
[0041] The arc length between the starting position of the first sand discharge groove 301 and the head of the volute body 200 is 15°, and the connecting position of the first sand discharge groove 301 and the first sand discharge pipe 302 is flush with the axial extension line on the inner side wall of the water inlet pipe 100 closest to the center of the volute body 200.
[0042] The position of the volute body at an arc length of 15°-30° from the head is the area with the strongest centrifugal force of the water body, which enables the silt carried by the water flow to be "thrown" on the outer wall of the volute body most effectively, and more than 80% of the silt can enter the first sand discharge groove and be finally discharged by the first sand discharge pipe.
[0043] The ratio of the inlet diameter, the middle section diameter and the tail section diameter of the first sand discharge pipe 302 is 1.5:1:1.2, the diameter of the inlet section to the middle section of the first sand discharge pipe 302 gradually reduces, and the diameter of the middle section to the tail section gradually expands.
[0044] The inlet diameter, the middle section diameter and the tail section diameter of the first sand discharge pipe are set in the ratio of wide-narrow-wide, so that the Venturi effect is generated during use, which effectively utilizes the Venturi effect to accelerate the silt into the pipe while reducing the energy loss of the water flow.
[0045] The second self-sand discharge structure 400 is composed of a second sand discharge groove 401 arranged on the inner side wall of the volute body 200 and formed by the concave of the inner side wall of the volute body 200, and a second sand discharge pipe 402 connected with the second sand discharge groove 401.
[0046] The arc length between the starting position of the second sand discharge groove 401 and the head of the volute body 200 is 195°, and the arc length between the connecting position of the second sand discharge groove 401 and the second sand discharge pipe 402 and the head of the volute body 200 is 245°.
[0047] In order to avoid the remaining silt being brought back to the connection between the volute main body and the water inlet pipe, the second desilting groove is arranged to discharge the remaining silt as much as possible. Through the first and second self-desilting structures, the product of the embodiment can discharge more than 90% of the silt, greatly reducing the wear of the subsequent silt on the runner structure, and can extend the overall maintenance frequency of the water turbine from 3 months to 8-12 months.
[0048] The ratio of the inlet diameter, the middle section diameter and the tail section diameter of the second desilting pipe 402 is 1.5:1:1.2, the diameter of the inlet section to the middle section of the second desilting pipe 402 gradually decreases, and the diameter of the middle section to the tail section gradually increases.
[0049] The inlet diameter, the middle section diameter and the tail section diameter of the second desilting pipe are arranged in a wide-narrow-wide ratio, so that a Venturi effect is generated during use, effectively utilizing the Venturi effect to accelerate the silt into the pipe while reducing the energy loss of the water flow.
[0050] The water inlet pipe 100 is provided with a filter screen.
[0051] The purpose of arranging the filter screen at the water inlet pipe is to filter out large-volume debris such as stones, branches, leaves, artificial garbage and the like carried by the water flow, so as to avoid the large-volume debris from blocking the first and second self-desilting structures or damaging the internal accessories of the water turbine.
[0052] Embodiment 2
[0053] The difference between the embodiment and the embodiment 1 is that the ratio of the head inner diameter to the tail inner diameter of the volute main body 200 is 2.8:1.
[0054] The arc length between the starting position of the first desilting groove 301 and the head of the volute main body 200 is 30°.
[0055] The arc length between the starting position of the second desilting groove 401 and the head of the volute main body 200 is 210°, and the arc length between the connection position of the second desilting groove 401 and the second desilting pipe 402 and the head of the volute main body 200 is 260°.
[0056] Embodiment 3
[0057] The difference between the embodiment and the embodiment 1 is that the ratio of the head inner diameter to the tail inner diameter of the volute main body 200 is 2.5:1.
[0058] The arc length between the starting position of the first desilting groove 301 and the head of the volute main body 200 is 20°.
[0059] The arc length between the starting position of the second sand discharge groove 401 and the head of the volute body 200 is 200°, and the arc length between the connecting position of the second sand discharge groove 401 and the second sand discharge pipe 402 and the head of the volute body 200 is 250°
[0060] It should be noted that all the features disclosed in the specification, or all the steps of the methods or processes disclosed, can be combined in any combination, except combinations where at least some of the features and / or steps are mutually exclusive.
[0061] In addition, the above specific embodiments are exemplary, and those skilled in the art can think of various solutions under the inspiration of the disclosure of the present application, and these solutions also belong to the disclosed range of the present application and fall within the protection scope of the present application. Those skilled in the art should understand that the specification and drawings of the present application are illustrative and do not constitute a limitation on the claims. The protection scope of the present application is defined by the claims and their equivalents.
Claims
1. A double passage self-cleaning spiral case based on water turbine, characterized in that, The water inlet pipe (100), the volute body (200) connected with the water inlet pipe (100), the first self-desilting structure (300) arranged on the volute body (200), the second self-desilting structure (400) arranged on the volute body (200), and the seat ring fixing table (500) arranged at the center position of the volute body (200) in a ring shape for fixing the water turbine seat ring.
2. The dual pass self-cleaning spiral case based on water turbines according to claim 1, characterized in that, The inner side walls of the volute body (200), the first self-desilting structure (300) and the second self-desilting structure (400) are provided with tungsten carbide or tungsten carbide cobalt coating; the first self-desilting structure (300) and the second self-desilting structure (400) are arranged along the outer center line of the volute body (200).
3. The dual pass self-cleaning spiral case based on water turbines according to claim 2, characterized in that, The volute body (200) is composed of taper pipes with gradually reduced inner diameters connected end to end, the lowest points of the outer side walls of the volute body (200) are located on the same horizontal plane, and the ratio of the inner diameter of the head portion to the inner diameter of the tail portion of the volute body (200) is 2.3:1-2.8:
1.
4. The dual pass self-cleaning spiral case based on water turbines according to claim 3, characterized in that, The first self-desilting structure (300) is composed of a first desilting groove (301) arranged on the inner side wall of the volute body (200) and formed by the concave of the inner side wall of the volute body (200), and a first desilting pipe (302) in communication with the first desilting groove (301).
5. The dual pass self-cleaning spiral case based on water turbines according to claim 4, characterized in that, The arc length between the starting position of the first desilting groove (301) and the head portion of the volute body (200) is 15°-30°, and the connecting position of the first desilting groove (301) and the first desilting pipe (302) is flush with the axial extension line on the inner side wall of the water inlet pipe (100) closest to the center of the volute body (200).
6. The dual pass self-cleaning spiral case based on water turbines according to claim 5, characterized in that, The ratio of the inlet diameter, the middle section diameter and the tail section diameter of the first desilting pipe (302) is 1.5:1:1.2, the diameter of the inlet section to the middle section of the first desilting pipe (302) gradually reduces, and the diameter of the middle section to the tail section gradually expands.
7. The dual pass self-cleaning spiral case based on water turbines according to claim 3, characterized in that, The second self-desilting structure (400) is composed of a second desilting groove (401) arranged on the inner side wall of the volute body (200) and formed by the concave of the inner side wall of the volute body (200), and a second desilting pipe (402) in communication with the second desilting groove (401).
8. The dual pass self-cleaning spiral case based on water turbines according to claim 7, characterized in that, The arc length between the starting position of the second desilting groove (401) and the head portion of the volute body (200) is 195°-210°, and the arc length between the connecting position of the second desilting groove (401) and the second desilting pipe (402) and the head portion of the volute body (200) is 245°-260°.
9. The dual pass self-cleaning spiral case based on water turbines according to claim 8, characterized in that, The ratio of the inlet diameter, the middle section diameter and the tail section diameter of the second desilting pipe (402) is 1.5:1:1.2, the diameter of the inlet section to the middle section of the second desilting pipe (402) gradually reduces, and the diameter of the middle section to the tail section gradually expands.
10. The dual pass self-cleaning spiral case based on water turbines according to claim 1, characterized in that, A filter screen is arranged on the water inlet pipe (100).