Water turbine guide vane mechanism

Abstract

The utility model relates to the technical field of water turbine guide vanes, and discloses a water turbine guide vane mechanism which comprises a guide vane, a seat ring, a sleeve I and a top cover, the top cover is connected to the seat ring, and the guide vane is connected to the top cover through the sleeve I. The water turbine guide vane mechanism is characterized in that a detachable flange is arranged at the bottom of the sleeve I; the service life is further prolonged, and the replacement frequency and the maintenance cost are reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of water turbine guide vane mechanism, specifically relates to a water turbine guide vane mechanism. BACKGROUND

[0002] Water turbine guide vane mechanism is one of the core components of the water turbine generator unit, which plays a key role in controlling the direction and size of water flow into the unit during operation, and is crucial to the stability and safety of the entire unit operation. The water turbine guide vane mechanism is generally composed of movable guide vanes, guide vane sleeves, guide vane transmission mechanisms (including guide vane arms, connecting plates, connecting rods), control rings, top covers, seat rings and bottom rings. The sleeve bears the water pressure of the top cover to ensure that the pressurized water does not enter the top cover. For power plants with a lot of silt, the contact surface of the sleeve with the pressurized water is often worn out, resulting in a loss of sealing, and pressurized water enters the top cover. Lightly, the water submerges the bearing, causing the oil inside the bearing to deteriorate, which cannot play a lubricating and oil film forming role, resulting in bearing bushing burnout, and the unit cannot operate normally. Heavy water submerges the plant

[0003] Chinese patent document CN212601629U discloses a water turbine top cover bolt installation tool, which comprises a water turbine upper rack, a top cover arranged below the water turbine upper rack, a guide vane rotating shaft arranged on the water turbine upper rack and penetrating the top cover, a seat ring arranged at the lower end of the top cover and sealingly nested with the top cover, a guide plate arranged at the upper end of the water turbine upper rack, a fixed plate arranged between the guide plate and the water turbine upper rack and sleeved with the guide vane rotating shaft, a guide vane sleeve arranged at the lower end of the fixed plate and extending into the top cover and sealingly nested with the guide vane rotating shaft, a double-headed screw rod arranged on the top cover and threadedly sleeved with the seat ring, and an extension rod arranged at the upper end of the double-headed screw rod and extending out of the end surface of the guide plate and threadedly sleeved with the double-headed screw rod.

[0004] Chinese patent document CN205445872U discloses a Francis turbine structure, which comprises a runner connected to a main shaft, an upper leakage stop ring arranged at the upper end of the runner, a top cover and a top cover guard plate arranged above the upper leakage stop ring, a seat ring arranged outside the top cover guard plate, a bottom ring and a bottom ring guard plate arranged at the outer end of the runner, a lower leakage stop ring, an upper section cone pipe and a lower section cone pipe arranged in sequence below the bottom ring, and a guide vane arranged between the bottom ring and the top cover guard plate. In this technical solution, the seat ring is arranged outside the top cover guard plate, and the guide vane is arranged between the bottom ring and the top cover guard plate.

[0005] The Chinese patent document CN205445872U has the following disadvantages: during the operation of the water turbine under a small water head, the water flow will continuously impact the sleeve of the seat ring, especially under high flow speed and large sand content, the impact and abrasion will be more serious, the penetration of the sand will aggravate the abrasion of the sleeve, thus scratches, pits and other damages will appear on the surface of the lower end face of the sleeve, and therefore the sleeve needs to be frequently replaced, the number of the sleeves in the water turbine is large, and after replacement, the positioning pin of the top cover needs to be re-punched, which wastes manpower and financial resources and has high replacement cost. Content of the utility model

[0006] The utility model discloses in order to solve the technical problem of high replacement cost of the sleeve of the water turbine, provides a water turbine guide vane mechanism, including guide vane, seat ring, sleeve one and top cover, the top cover is connected on the seat ring, the guide vane is connected on the top cover through the sleeve one, its characterized in that, the bottom of sleeve one is equipped with detachable flange.

[0007] Preferably, the flange is matched with the sleeve one through the stop opening and is connected and fixed by the set screw.

[0008] In order to facilitate installation positioning and spacing, the top cover is provided with a stop opening, and the flange is inserted into the stop opening.

[0009] In order to avoid water inlet above the seat ring, the inner wall and the outer wall of the flange are provided with sealing rings.

[0010] In order to facilitate connection, the upper end of the sleeve one is fixed on the upper flange of the top cover through a connecting piece, the upper flange is connected to the seat ring, the bottom of the sleeve one is inserted into the lower flange of the top cover, and the guide vane shaft of the guide vane passes through the top cover and is inserted into the sleeve one.

[0011] Preferably, the guide vane shaft of the other end of the guide vane is connected to the bottom ring through a sleeve two, and the sleeve two and the bottom ring are an integral structure.

[0012] In order to improve the service life and reduce the maintenance cost, the flange is made of wear-resistant material.

[0013] The utility model has the following beneficial effects:

[0014] 1. During the operation of the water turbine under a small water head, the flange at the bottom of the sleeve one is abraded by the water flow, only the flange needs to be replaced, the sleeve one body does not need to be replaced, and compared with the structure in the prior art, the sleeve one in the utility model can be made of carbon steel which is not wear-resistant and low in cost, while the flange is made of stainless steel which is high in cost, thereby further improving the service life, reducing the replacement frequency and the maintenance cost. BRIEF DESCRIPTION OF DRAWINGS

[0015] Figure 1 It is a schematic view of the embodiment of the water turbine guide vane mechanism of the utility model.

[0016] Figure 2 For Figure 1 Enlarged view of A in the middle. DETAILED DESCRIPTION

[0017] The following will be further explained in detail by specific embodiments:

[0018] 1. The reference signs in the drawings of the specification include: guide vane 1, seat ring 2, bottom ring 3, sleeve 1 4, top cover 5, upper flange 501, lower flange 502, guide vane shaft 6, flange 7, stop 8, sealing ring 9, sleeve 2 10, set screw 11.

[0019] Example 1

[0020] As Figure 1 and 2 shown, a water turbine guide vane mechanism includes guide vane 1, seat ring 2, bottom ring 3, sleeve 1 4, and top cover 5, the top cover 5 is connected to the seat ring 2, the guide vane shaft 6 at the upper part of the guide vane 1 is connected to the top cover 5 through the sleeve 1 4, the bottom of the sleeve 1 4 is provided with a detachable flange 7, the flange 7 is matched with the sleeve 1 4 through the stop and is connected and fixed by the set screw 11.

[0021] The top cover 5 is provided with a stop 8, the flange 7 is inserted into the stop 8, and the guide vane shaft 6 at the lower part of the guide vane 1 is connected to the bottom ring 3 through the sleeve 2 10.

[0022] The inner wall and the outer wall of the flange 7 are provided with a sealing ring 9.

[0023] The upper end of the sleeve 1 4 is fixed to the upper flange 501 of the top cover 5 through a screw, the upper flange 501 is connected to the seat ring 2, the bottom of the sleeve 1 4 is inserted into the lower flange 502 of the top cover 5, and the guide vane 1 passes through the top cover 5 and is inserted into the sleeve 1 4.

[0024] The flange 7 is made of stainless steel wear-resistant material, and the sleeve 1 4 is made of low-cost carbon steel.

[0025] The sleeve 2 10 and the bottom ring 3 are an integral structure.

[0026] The flange 7 at the lower part of the sleeve 1 4 is replaceable, when the lower part of the sleeve 1 4 is worn, the worn flange 7 can be directly replaced. In this way, the replacement period can be accelerated, and new sleeves do not need to be re-made, saving costs.

[0027] The above-mentioned is only the embodiment of the present application, and the common knowledge of the specific structure and characteristics in the scheme is not described in detail, the ordinary skilled person in the art knows all the ordinary technical knowledge in the technical field of the present application before the application date or the priority date, can know all the prior art in the field, and has the ability to apply the conventional experimental means before the date, the ordinary skilled person in the art can improve and implement the present scheme under the enlightenment given in the present application, and some typical known structures or known methods should not become an obstacle for the ordinary skilled person in the art to implement the present application. It should be pointed out that for the skilled person in the art, without departing from the structure of the present application, a number of modifications and improvements can be made, which should also be considered as the protection scope of the present application, which will not affect the effect and practicality of the present application. The protection scope of the present application should be subject to the content of its claims, and the specific implementation mode and the like in the specification can be used to explain the content of the claims.

Claims

1. A turbine guide vane mechanism, comprising a guide vane, a seat ring, a sleeve 1, and a top cover, wherein the top cover is connected to the seat ring, and the guide vane is connected to the top cover through the sleeve 1, characterized in that: The bottom of the sleeve 1 is provided with a detachable flange.

2. The water turbine guide vane mechanism according to claim 1, characterized in that: The flange and the sleeve are matched through the stopper and are connected and fixed by the set screws.

3. The water turbine guide vane mechanism according to claim 2, characterized in that: The top cover is provided with a stopper, and the flange is inserted into the stopper.

4. The water turbine guide vane mechanism according to claim 3, characterized in that: The inner wall and the outer wall of the flange are provided with sealing rings.

5. The water turbine guide vane mechanism according to claim 4, characterized in that: The upper end of the sleeve is fixed to the upper flange of the top cover through a connecting piece, the upper flange is connected to the seat ring, the bottom of the sleeve is inserted into the lower flange of the top cover, and the guide vane shaft of the guide vane passes through the top cover and is inserted into the sleeve.

6. The water turbine guide vane mechanism according to claim 5, characterized in that: The guide vane shaft at the other end of the guide vane is connected to the bottom ring through a second sleeve, and the second sleeve and the bottom ring are an integral structure.

7. The water turbine guide vane mechanism according to any one of claims 1 to 6, characterized in that: The flange is made of wear-resistant material.

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