CN214660586U

CN214660586U - Top cover main shaft sealing water leakage inhibiting device of vertical shaft mixed flow type water turbine

Info

Publication number: CN214660586U
Application number: CN202120346457.3U
Authority: CN
Inventors: 周涛; 朱晓敏; 胡杨; 蒋云鹏; 吴冬林; 肖定波
Original assignee: Nanyahe Power Plant Of State Grid Sichuan Electric Power Co ltd
Current assignee: Nanyahe Power Plant Of State Grid Sichuan Electric Power Co ltd
Priority date: 2020-10-23
Filing date: 2021-02-07
Publication date: 2021-11-09
Anticipated expiration: 2031-02-07

Abstract

The utility model discloses a vertical scroll mixed-flow hydraulic turbine top cap main shaft seal suppression device that leaks, including the epaxial bolt safety cover of fixed connection, fixed connection fixed seal seat and the epaxial ring that wear-resistants of fixed connection on the top cap epicoele. The upper end face of the bolt protection cover is fixedly connected with a rotary sealing ring, a blade rib plate is welded on the outer side wall of the rotary sealing ring, and right-handed trapezoidal threads are arranged on the inner side wall of the rotary sealing ring. The fixed sealing seat covers the rotary sealing ring and the blade rib plate, the inner side of the inner upper wall of the fixed sealing seat is connected with the fixed sealing ring, a left-hand trapezoidal thread is arranged on the outer side wall of the fixed sealing ring, and the left-hand trapezoidal thread and the right-hand trapezoidal thread are arranged oppositely. The top of the fixed seal seat is fixedly connected with a pressing plate, wear-resistant rubber is arranged on the pressing plate, and the antiwear ring is located above the wear-resistant rubber. The utility model discloses a unit shut down state, start-up and shut down process and operation etc. do not leak water down under the operating mode, have higher application and spreading value.

Description

Top cover main shaft sealing water leakage inhibiting device of vertical shaft mixed flow type water turbine

Technical Field

The utility model relates to a top cap main shaft seal field of vertical scroll mixed-flow water turbine, concretely relates to vertical scroll mixed-flow water turbine top cap main shaft seal suppression device that leaks.

Background

The water turbine model of the existing power station is as follows: HLA542-LJ-215 which is a vertical shaft mixed flow water turbine with the rated rotation speed of 500r/min, the top cover main shaft seal is divided into a main shaft working seal and a main shaft maintenance seal, the main shaft working seal adopts a labyrinth ring structure, and the main shaft maintenance seal adopts an air shroud type structure. In the actual operation of the water turbine, the runner leak-stopping ring can generate a small amount of water seepage, the seepage can enter a machine pit along the gap between the main shaft and the main shaft seal to hinder the normal operation of other equipment, and the amount of the seepage is in direct proportion to the size of the gap between the main shaft and the working seal. Under the normal condition of the main shaft seal, the water seepage condition can occur mainly in the machine set stop state or the start-stop process (because the rotating wheel is provided with the pump plate device, after the machine set reaches the rated rotating speed, the water seepage at the main shaft seal position can not overflow).

The main shaft working seal is composed of a fixed thread pump wheel, a rotating thread pump wheel and a seal seat, and is of a two-half combined structure. The large amount of water seepage is caused under the condition of load of the unit due to the overlarge gap between the working seal fixing of the main shaft and the rotating threaded pump wheel, and the safe and stable operation of the unit is seriously influenced.

The structural types of the working seal for the main shaft of the vertical shaft mixed flow type water turbine at home and abroad can be divided into the following types:

(1) and (5) sealing the flat plate. The flat plate seal mainly utilizes the rubber plate and the end face of the stainless steel rotating ring fixed on the main shaft to form seal, and the seal is carried out by water pressure, and the structure is simple.

(2) And (4) radial sealing. The radial seal is formed by pressing a plurality of fan-shaped carbon blocks on the main shaft in the steel fan-shaped block by a spring, a layer of seal is formed, and a small drain hole is formed in the seal ring to drain leaked water.

(3) And (5) end face sealing. The end face sealing is of a mechanical type and a hydraulic type. The mechanical end face seal is realized by supporting a disc provided with a circular rubber block by a spring, so that the circular rubber block is tightly attached to a stainless steel ring fixed on a main shaft to play a sealing role. The rubber sealing ring is fixed on the top cover (or the supporting cover) of the water turbine.

(4) The labyrinth ring is sealed. The working principle is that a pump plate device is arranged at the top of a rotating wheel of the water turbine, a main shaft flange is always in the atmosphere due to the suction effect of the pump plate, a shaft is not in contact with a shaft seal and only has a layer of air, and the seal has extremely long service life. The main shaft working seal is of a non-contact labyrinth type and comprises a rotating sleeve, a seal box, a main shaft seal drain pipe and the like which are close to a shaft. Under the normal operation condition of the water turbine, no water pressure exists on the sealing box within the whole load range. The pump plate on the runner rotates along with the runner to prevent water and solids from entering the main shaft seal, and the pump plate drain pipe prevents sand or solid matters from accumulating under the top cover of the water machine and discharges a small amount of water leakage penetrating through the upper leakage stop ring to tail water through the pump plate drain pipe.

The above conventional design of the main shaft working seal mainly has the following problems and disadvantages:

(1) the flat seal is easy to wear due to long-term contact with the end face of the rotating ring, the sealing effect is poor, the service life is short, frequent replacement is needed, and the working strength of overhaul and maintenance personnel is increased.

(2) The radial sealing structure is complex, the installation and the maintenance are difficult, the performance of the spring is not easy to guarantee, and the radial self-adjusting quantity after the friction is small. It is mainly used for sealing in clean water and has poor wear resistance in muddy water.

(3) The end face sealing structure is simple and easy to adjust, but the stress of the spring is uneven, the spring is easy to generate eccentric clamping and abrasion, and the sealing performance is unstable.

(4) The labyrinth ring seal is widely applied to the vertical shaft mixed flow water turbine, but the water seepage phenomenon can occur more or less due to the reduction of the rotating speed in the shutdown or startup and shutdown process of the unit.

At present, various main shaft working sealing modes can not achieve the purpose that the main shaft sealing part of a machine set can not seep water in a shutdown state, a startup and shutdown process and a running state.

SUMMERY OF THE UTILITY MODEL

The main shaft work sealing mode that exists to prior art can not reach the unit and all not the problem of oozing water under the shut down state, start-up shutdown process and running state of main shaft seal department, the utility model provides a vertical scroll mixed-flow turbine top cap main shaft seal suppression device that leaks has realized that the unit does not leak water under the full operating mode such as shut down state, start-up shutdown process and running state.

The utility model adopts the following technical proposal:

the device for inhibiting the water leakage of the top cover main shaft seal of the vertical shaft mixed flow type water turbine comprises a bolt protective cover fixedly connected to a main shaft, a fixed seal seat fixedly connected to an upper cavity of the top cover and an anti-wear ring fixedly connected to the main shaft;

the upper end face of the bolt protective cover is fixedly connected with a rotary sealing ring, a blade rib plate is welded on the outer side wall of the rotary sealing ring, and right-handed trapezoidal threads are arranged on the inner side wall of the rotary sealing ring;

the fixed sealing seat covers the rotary sealing ring and the blade rib plate, the inner side of the inner upper wall of the fixed sealing seat is connected with the fixed sealing ring, the rib plate is connected to the inner side wall of the fixed sealing ring, the outer side wall of the fixed sealing ring is provided with a left-hand trapezoidal thread, and the left-hand trapezoidal thread and the right-hand trapezoidal thread are arranged oppositely;

at the top fixedly connected with clamp plate of fixed seal seat, be provided with wear-resisting rubber on the clamp plate, there is the interval between the top of wear-resisting rubber and fixed seal seat, wear-resisting ring is located wear-resisting rubber's top.

Preferably, the bolt protecting cover is fixed on the main shaft by a bolt.

Preferably, the bottom of the rotary sealing ring is fixed on the bolt protective cover through a bolt.

Preferably, a gap is reserved between the left-handed trapezoidal thread and the right-handed trapezoidal thread.

Preferably, the size of the gap is between 0.5 mm and 0.8 mm.

Preferably, the fixed sealing seat comprises a circular-cap-shaped sealing seat body, a through hole is formed in the center of the sealing seat body, and the sealing seat body is sleeved on the main shaft through the through hole; the both sides of seal receptacle body are provided with the connecting plate, and the seal receptacle body passes through the connecting plate to be connected on the top cap epicoele.

Preferably, the seal seat body covers the rotary seal ring, the blade rib plate, the right-handed trapezoidal thread, the fixed seal ring, the rib plate and the left-handed trapezoidal thread.

Preferably, the fixed sealing ring is fixedly connected to the inner upper wall of the sealing seat body through a bolt, and the fixed sealing ring is located on the inner side of the rotary sealing ring.

Preferably, the abrasion resistant rubber can be in contact with or separated from the abrasion resistant ring.

Preferably, the wear-resistant rubber is transversely arranged.

The utility model has the advantages that:

the utility model provides a vertical shaft mixed flow turbine top cap main shaft seal water leakage suppression device, can reach the main shaft seal water leakage suppression effect under the unit full operating mode; because the condition that the abrasion is generated by the attachment of the abrasion-resistant rubber plate and the abrasion-resistant ring is only in the machine set shutdown state or the startup and shutdown process, the time is short, the service life of the abrasion-resistant rubber plate can be greatly prolonged, and the working strength of maintenance personnel is reduced. The device can also prevent that each bearing seepage oil of hydroelectric set from flowing into the tail water and leading to taking place the environmental protection incident, can reduce the inflow water volume of hydropower station sump pit greatly, reduces the start-stop frequency of seepage drain pump, also can reduce the station power consumption. At present, the main shaft seal of the same type of unit water turbine at home and abroad has more or less water leakage phenomenon, and the utility model discloses higher application and popularization value have.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below.

Fig. 1 is a structural sectional view of a main shaft sealing water leakage suppression device of a top cover of a vertical shaft mixed flow type water turbine.

1. Fixing the sealing ring; 2. a rib plate; 3. a left-handed trapezoidal thread; 4. an antiwear ring; 5. pressing a plate; 6. wear-resistant rubber; 7. fixing a sealing seat; 8. a blade rib plate; 9. right-handed trapezoidal threads; 10. rotating the sealing ring; 11. a bolt protecting cover; 12. a main shaft; 13. a connecting plate.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like, indicate the orientation or positional relationship indicated based on the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore, should not be construed as limiting the present invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In the description of the present invention, "a plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," and "fixed" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present invention can be understood according to specific situations by those skilled in the art.

Referring to fig. 1, the device for suppressing water leakage of a top cover main shaft seal of a vertical shaft mixed flow type water turbine comprises a bolt protective cover 11 fixedly connected to a main shaft 12, a fixed seal seat 7 fixedly connected to an upper cavity (not shown) of the top cover, and an antiwear ring 4 fixedly connected to the main shaft 12.

The bolt protective cover 11 is fixed on the main shaft through a bolt, and the antiwear ring is fixed on the main shaft through a pin bolt.

The bolt guard 11 and the wear ring 4 can rotate together with the spindle.

The fixed seal seat 7 is fixed on the upper cavity of the top cover, and the fixed seal seat 7 is sleeved on the main shaft and does not rotate along with the main shaft.

The upper end face of the bolt protective cover is fixedly connected with a rotary sealing ring 10, and the rotary sealing ring is fixed on the bolt protective cover through a bolt, so that the structural strength is high.

The outer side wall of the rotary sealing ring is welded with a blade rib plate 8, and the blade rib plate 8 can play a role in flow blocking during rotation.

The inner side wall of the rotary sealing ring 10 is provided with a right-handed trapezoidal thread 9.

The fixed sealing seat 7 is internally provided with a cavity, and the fixed sealing seat covers the rotary sealing ring 10 and the blade rib plate 8.

The inner side of the inner upper wall of the fixed sealing seat is connected with a fixed sealing ring 1, and the fixed sealing ring is fixedly connected to the inner upper wall of the fixed sealing seat through a bolt.

The inner side wall of the fixed sealing ring is connected with a rib plate 2, so that the structural strength of the fixed sealing ring 1 can be enhanced.

The outer side wall of the fixed sealing ring is provided with a left-handed trapezoidal thread 3, and the left-handed trapezoidal thread and the right-handed trapezoidal thread are arranged oppositely. A gap is arranged between the left-handed trapezoidal thread and the right-handed trapezoidal thread, and the size of the gap is between 0.5 mm and 0.8 mm.

When the main shaft rotates, the right-handed trapezoidal thread 9 is driven to rotate, and the left-handed trapezoidal thread 3 and the right-handed trapezoidal thread 9 are matched to play a role in flow resistance.

The fixed seal seat 7 specifically comprises a round-cap-shaped seal seat body, a through hole is formed in the center of the seal seat body, and the seal seat body is sleeved on the main shaft through the through hole.

The both sides of seal receptacle body are provided with connecting plate 13, and the seal receptacle body passes through the connecting plate to be connected on the top cap epicoele.

The seal seat body covers the rotary seal ring, the blade rib plate, the right-handed trapezoidal thread, the fixed seal ring, the rib plate and the left-handed trapezoidal thread.

The fixed sealing ring is fixedly connected to the inner upper wall of the sealing seat body through a bolt, and the fixed sealing ring is located on the inner side of the rotary sealing ring.

The top of the fixed seal seat is fixedly connected with a pressing plate 5, a transverse wear-resistant rubber 6 is arranged on the pressing plate, and a space is reserved between the wear-resistant rubber and the top of the fixed seal seat.

The antiwear ring 4 is located above the antiwear rubber 6, and the antiwear rubber can contact with or separate from the antiwear ring.

Under the rated rotation speed of the vertical shaft mixed flow type turbine unit, a pump plate device on the rotating wheel can discharge a large amount of water to tail water through a top cover pressure equalizing drain pipe, and a small amount of water in the top cover upper cavity can be inhibited by the matching clearance between the left-handed trapezoidal thread 3 and the right-handed trapezoidal thread 9 of 0.5 mm to 0.8 mm. At this time, the wear-resistant rubber is not in contact with the antiwear ring.

At unit off-state or start-up and shut down in-process, from the top cap epicoele through the percolating water between levogyration trapezoidal thread 3 and dextrorotation trapezoidal thread 9, get into between the top of wear-resisting rubber and fixed seal receptacle through the space of main shaft and this device to form water pressure, water pressure makes wear-resisting rubber 6 laminate with wear-resisting ring 4 (laminating friction time is shorter), thereby plays sealed effect, can effectively restrain the percolating water that the unit appears at off-state or start-up and shut down in-process.

Can see from the description of above-mentioned two processes, the utility model discloses a water leakage suppression device can effectively restrain the percolating water that appears under the full operating mode such as unit shut down state, start-stop process and operation.

Of course, the above description is not intended to limit the present invention, and the present invention is not limited to the above examples, and the changes, modifications, additions or substitutions made by those skilled in the art within the scope of the present invention should also belong to the protection scope of the present invention.

Claims

1. The device for inhibiting the water leakage of the top cover main shaft seal of the vertical shaft mixed flow type water turbine is characterized by comprising a bolt protective cover fixedly connected to a main shaft, a fixed seal seat fixedly connected to an upper cavity of the top cover and an antiwear ring fixedly connected to the main shaft;

2. The vertical shaft mixed flow hydraulic turbine head main shaft seal water leakage suppression device of claim 1, wherein the bolt protection cover is fixed on the main shaft through a bolt.

3. The vertical shaft mixed flow type hydraulic turbine head spindle seal water leakage suppression device according to claim 1, wherein the bottom of the rotary seal ring is fixed on a bolt protection cover through a bolt.

4. The vertical shaft mixed flow water turbine head spindle seal water leakage suppression device of claim 1, wherein a gap is formed between the left-hand trapezoidal thread and the right-hand trapezoidal thread.

5. The vertical shaft mixed flow hydraulic turbine head spindle seal water leakage suppression device of claim 4, wherein the size of the gap is between 0.5 mm and 0.8 mm.

6. The vertical shaft mixed flow type hydraulic turbine head main shaft seal water leakage suppression device according to claim 1, wherein the fixed seal seat comprises a circular cap-shaped seal seat body, a through hole is formed in the center of the seal seat body, and the seal seat body is sleeved on the main shaft through the through hole; the both sides of seal receptacle body are provided with the connecting plate, and the seal receptacle body passes through the connecting plate to be connected on the top cap epicoele.

7. The vertical shaft mixed flow type water turbine head spindle seal water leakage suppression device according to claim 6, wherein the seal seat body covers the rotary seal ring, the blade rib plate, the right-handed trapezoidal thread, the fixed seal ring, the rib plate and the left-handed trapezoidal thread.

8. The vertical shaft mixed flow type hydraulic turbine head spindle seal water leakage suppression device according to claim 6, wherein the fixed seal ring is fixedly connected to the inner upper wall of the seal seat body through a bolt, and the fixed seal ring is located on the inner side of the rotary seal ring.

9. The vertical shaft mixed flow hydraulic turbine head spindle seal water leakage suppression device of claim 1, wherein the wear resistant rubber can contact or separate from the wear resistant ring.

10. The vertical shaft mixed flow hydraulic turbine head spindle seal water leakage suppression device of claim 1, wherein the wear-resistant rubber is transversely disposed.