Impact type unit shell air supply device

Abstract

The utility model relates to the field of impulse turbines, and discloses an air supply device for an impulse unit casing. The air inlet pipe, the air outlet pipe and the drainage pipe are respectively connected with the air collecting tank; air in the air collecting tank is supplemented into the shell through the air inlet pipe; and the drainage pipe can timely drain water drops in the gas collection tank. According to the utility model, the air supply pipeline can be effectively prevented from being blocked by accumulated water, the design difficulty of the pipeline is simplified, and a guarantee is provided for long-term safe and stable operation of a unit.

Description

Technical Field

[0001] The utility model relates to the field of impulse turbines, in particular to an air supply device for an impulse turbine casing. Background Art

[0002] When the impulse turbine is running, the high-speed water flow will carry away a large amount of air in the casing. This requires that air be continuously supplied to the casing during the operation of the turbine to avoid adverse operating conditions in the casing that affect the efficiency of the unit. Usually, a natural air supply method is adopted, and an independent air supply pipeline system is generally provided for each nozzle. The air supply pipeline must have a certain slope from the casing to the air inlet to prevent water mist or splashing water in the casing from entering the pipeline and causing blockage, thereby limiting the high-load output of the unit. The air collection device of the utility model can effectively avoid the above situation, while also optimizing the layout of the air intake pipeline and reducing the design difficulty of the air supply pipeline. Summary of the Invention

[0003] The main purpose of this utility model is to provide a novel air supply device. The technical solution is as follows: an air collecting box is positioned outside the casing. An air inlet pipe is installed on the upper side of the box, leading to the outside of the plant or to the downstream tailwater corridor. An air outlet pipe and a drain pipe are installed at the bottom of the box, with the outlet pipe inlet elevated above the bottom. The outlet pipe leads to the bottom of the nozzle inside the casing, while the drain pipe leads directly to the downstream corridor. Outside air enters the box through the air inlet pipe and is then drawn back into the casing through the air outlet pipe.

[0004] The technical solution of the utility model will benefit the impulse turbine in the following aspects:

[0005] 1. The gas collecting box is arranged near the casing and has a certain gas volume, which is more effective and faster in replenishing the negative pressure in the casing.

[0006] 2. Set up a drainage pipeline for the air collecting box to prevent the air supply pipeline from being blocked, making the operation more reliable.

[0007] 3. Existing air supply piping types require sufficient slope when designing them. This complicates the piping layout to avoid interference with other equipment, making it difficult to design. Furthermore, the resulting water mist can affect the air supply volume. Improper piping design can easily lead to water accumulation and blockage. The air intake system eliminates the need to consider slope when designing the system, simplifying piping layout. BRIEF DESCRIPTION OF THE DRAWINGS

[0008] Figure 1 This is the overall layout diagram of the air supply to the casing of the impact type unit;

[0009] Figure 2 Schematic diagram of the gas collecting box. DETAILED DESCRIPTION

[0010] To make the technical solutions and beneficial effects of the present invention more clearly understood, the technical solutions in the embodiments of the present invention are described clearly and completely below in conjunction with the accompanying drawings. Obviously, the following embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, other embodiments obtained by persons of ordinary skill in the art without any creative effort are all within the scope of protection of the present invention.

[0011] Working Principle: The air intake pipe is connected to the outside atmosphere, through which atmospheric air enters the air collecting box. During unit operation, the air inside the casing is entrained by the water flow, creating a negative pressure. Air from the air collecting box is then promptly replenished into the casing, improving hydraulic conditions, especially under high-load conditions. During operation, water mist formed inside the casing flows through the air outlet pipe into the air collecting box, where it liquefies into water and flows through the bottom drain pipe to the tailwater channel. This ensures the unobstructed flow of the entire air supply line, effectively preventing limited unit output, reduced efficiency, vibration, and noise caused by blockage or insufficient air supply.

[0012] like Figure 1 、 Figure 2 As shown, a gas collecting box 2 is positioned outside the casing 1. An air inlet pipe 5 is installed on the upper side of the box, leading to the outside of the plant or to the downstream tailwater corridor. An air outlet pipe 3 and a drain pipe 4 are installed at the bottom of the box, with the outlet pipe inlet elevated above the bottom. The outlet pipe leads to the bottom of the nozzle inside the casing, while the drain pipe leads directly to the downstream corridor.

[0013] The above description is merely an embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention shall still fall within the scope of protection of the technical solution of the present invention.

Claims

1. An impact type unit casing air supply device, characterized in that: An air collecting box (2) is arranged outside the casing (1). An air inlet pipe (5) is provided on the upper side of the air collecting box (2) and is led to the outside of the factory or to the downstream tailwater gallery. An air outlet pipe (3) and a drainage pipe (4) are provided at the bottom of the air collecting box (2). The inlet of the air outlet pipe (3) is higher than the bottom of the box. The air outlet pipe (3) is led to the bottom of the nozzle in the casing, and the drainage pipe (4) is directly led to the downstream gallery. External air enters the air collecting box (2) through the air inlet pipe (5) and is then led into the casing (1) through the air outlet pipe (3).

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