Self-flowing drainage structure of water turbine top cover

Abstract

The utility model discloses a water turbine top cover self-flowing drainage structure, which relates to the field of water turbine mechanical equipment, and comprises a top cover, a working pipeline and a water storage pond, a water collecting cavity and a floater annunciator are arranged in the top cover, a water inlet pipe in the working pipeline is positioned in the water collecting cavity, a jet pump is arranged between the water inlet pipe and a transition pipe, and the floater annunciator is positioned in the water storage pond. The pressure gauge is located on the transition pipe, the valve is located between the transition pipe and the water outlet pipe, and a drainage cavity is formed in the water storage pond. The utility model is applied to axial-flow type and mixed-flow type water turbines and pump turbines; top cover accumulated water can be reduced, energy loss is avoided, and power generation efficiency is improved; rustiness and erosion of water leakage to the top cover and peripheral components are relieved, the service life of the unit is prolonged, and the maintenance cost is reduced; the surrounding environment of the top cover is kept in a relatively dry state, and safe operation of maintainers and normal inspection of equipment are facilitated.

Description

Technical Field

[0001] The utility model relates to the technical field of water turbine mechanical equipment, and more specifically to a water turbine top cover gravity drainage structure. Background Art

[0002] During the operation of a hydro-turbine generator set, water accumulation in the top cover cavity primarily results from leaking main shaft seals and guide vane sleeve seals. Some turbines equipped with top cover cooling water pipes may also experience leaks due to ruptures or perforations in these pipes. To prevent accumulated water from submerging the water guide bearings and impacting normal operation of the unit, the top cover must be drained promptly. Common drainage methods include gravity drainage, water pump drainage, and jet pump drainage.

[0003] Prior art publication number CN217206711U discloses an automatic drainage device for a turbine top cover, comprising a top cover body, a liquid level sensor, a siphon unit, and a pumping unit. While this device effectively drains accumulated water from the top cover, it is complex and difficult to maintain. Prior art publication number CN215761831U discloses a water jetting suction drainage device that utilizes only a simplified jet model. This overly simple and idealized structure makes it difficult to adapt to the variable operating conditions and complex structures of turbines, leaving room for improvement. Utility Model Content

[0004] In order to overcome the above-mentioned shortcomings of the prior art, the present invention combines the advantages of gravity drainage and jet pump drainage to provide a gravity drainage structure for a turbine top cover. The present invention can effectively solve the problem of excessive water accumulation in the turbine top cover and complicated drainage structure.

[0005] The technical solution of the present utility model is a self-flowing drainage structure for a turbine top cover, comprising a top cover, a working pipeline, and a water reservoir. A water collection chamber and a float signal indicator are provided within the top cover. The working pipeline includes an inlet pipe, a jet pump, a transition pipe, a pressure gauge, a valve, and an outlet pipe. The inlet pipe is located in the water collection chamber, the jet pump is installed between the inlet pipe and the transition pipe, the pressure gauge is located on the transition pipe, and the valve is located between the transition pipe and the outlet pipe. A drainage chamber is provided within the water reservoir.

[0006] In the above-mentioned turbine top cover gravity drainage structure, the float signaler is provided with a warning water level.

[0007] In the above-mentioned turbine top cover gravity drainage structure, the height of the water inlet pipe opening is slightly higher than the bottom of the water collecting chamber.

[0008] In the above-mentioned turbine top cover gravity drainage structure, the outlet pipe orifice is immersed in the drainage cavity.

[0009] In the above-mentioned turbine top cover gravity drainage structure, the height of the water storage tank slot is slightly higher than the height of the water inlet pipe mouth, and the drainage cavity is kept in an overflowing state.

[0010] Compared with the prior art, the beneficial effects of the present invention are:

[0011] 1. The structure of the utility model is universal and can be applied to axial flow turbines, mixed flow turbines and pump turbines.

[0012] 2. The utility model can reduce water accumulation on the top cover, avoid energy loss and improve power generation efficiency.

[0013] 3. The utility model can alleviate the rust erosion of the top cover and surrounding components caused by water leakage, extend the service life of the unit and reduce maintenance costs.

[0014] 4. The utility model can keep the environment around the top cover in a relatively dry state, which is beneficial to the safe operation of maintenance personnel and normal inspection of equipment. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a structural diagram of the present utility model.

[0016] Description of the marks in the figure:

[0017] 1-top cover, 11-water collecting chamber, 12-float signal device; 2-working pipeline, 21-water inlet pipe, 22-jet pump, 23-transition pipe, 24-pressure gauge, 25-valve, 26-water outlet pipe; 3-water storage tank, 31-drainage chamber. DETAILED DESCRIPTION

[0018] To make the purpose, technical solutions and beneficial effects of the present invention more clear, the following will be further explained in conjunction with the accompanying drawings and specific embodiments. However, each embodiment does not constitute a limitation of the present invention. The specific embodiments described in the accompanying drawings are exemplary and are only used to explain the present invention, and should not be understood as limiting the present invention.

[0019] like Figure 1 As shown, the present invention provides a self-flowing drainage structure for a turbine top cover, comprising a top cover 1, a working pipeline 2, and a water reservoir 3. A water collection chamber 11 and a float signaler 12 are provided within the top cover 1. The working pipeline 2 comprises an inlet pipe 21, a jet pump 22, a transition pipe 23, a pressure gauge 24, a valve 25, and an outlet pipe 26. A drainage chamber 31 is provided within the water reservoir 3. The float signaler is set to a warning water level, and the height of the inlet pipe opening is slightly higher than the bottom of the water collection chamber. The outlet pipe opening is immersed in the drainage chamber. The height of the water reservoir slot is slightly higher than the height of the inlet pipe opening, and the drainage chamber remains overflowing.

[0020] Example 1: During the initial operation of the turbine unit, there is no water in the working pipe 2. When water leaks into the water collection chamber 11 within the top cover 1 and the accumulated water exceeds the set warning level, the float signal 12 sends an electrical signal, opening valve 25 and activating the jet pump 22. Negative pressure develops in the water inlet pipe 21, causing water from the water collection chamber 11 to flow through the working pipe 2 into the water storage tank 3, and overflowing the drainage chamber 31. When the pressure gauge 24 reading remains stable, indicating that the working pipe 2 is full of water, the jet pump 22 is turned off. Due to the difference in liquid levels between the water collection chamber 11 and the drainage chamber 31, a siphon effect occurs, causing the remaining water in the water collection chamber 11 to continue flowing through the working pipe 2 into the water storage tank 3 until the water level in the water collection chamber 11 reaches the same level as the water level in the drainage chamber 31.

[0021] Example 2: When the turbine unit continues to operate and the situation of Example 1 has been completed, since the working pipeline 2 is full of water, the jet pump 22 is kept closed, the valve 25 is opened, and the water in the drainage chamber 31 is overflowing. When there is a liquid level difference between the water collecting chamber 11 and the drainage chamber 31, the accumulated water in the top cover 1 is drained by gravity through the siphon effect.

[0022] The technical scope of the present invention is not limited to the contents described above. Those skilled in the art can make various deformations and modifications to the above embodiments without departing from the technical concept of the present invention, and these deformations and modifications should all fall within the scope of the present invention.

Claims

1. A turbine top cover gravity drainage structure, characterized by: The invention comprises a top cover (1), a working pipeline (2) and a water storage tank (3); a water collecting chamber (11) and a float signal device (12) are arranged inside the top cover (1); the working pipeline (2) comprises a water inlet pipe (21), a jet pump (22), a transition pipe (23), a pressure gauge (24), a valve (25) and a water outlet pipe (26); the water inlet pipe (21) is located in the water collecting chamber (11); the jet pump (22) is installed between the water inlet pipe (21) and the transition pipe (23); the pressure gauge (24) is located on the transition pipe (23); the valve (25) is located between the transition pipe (23) and the water outlet pipe (26); and a drainage chamber (31) is arranged inside the water storage tank (3).

2. The turbine top cover gravity drainage structure according to claim 1, characterized in that: The float signal device (12) is used to set a warning water level.

3. The turbine top cover gravity drainage structure according to claim 1, characterized in that: The height of the water inlet pipe (21) is higher than the bottom of the water collecting chamber (11).

4. The turbine top cover gravity drainage structure according to claim 1, characterized in that: The outlet pipe (26) is immersed in the drainage cavity (31).

5. The turbine top cover gravity drainage structure according to claim 1, characterized in that: The height of the notch of the water storage tank (3) is higher than the height of the mouth of the water inlet pipe (21), and the drainage cavity (31) is kept in an overflowing state.

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