CN201705531U

CN201705531U - Device for preventing hydroelectric generating set from lifting

Info

Publication number: CN201705531U
Application number: CN2010201938755U
Authority: CN
Inventors: 王文超
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-05-18
Filing date: 2010-05-18
Publication date: 2011-01-12
Anticipated expiration: 2020-05-18

Abstract

The utility model belongs to hydraulic mechanical engineering, in particular to a device for preventing a hydroelectric generating set from lifting. The device is characterized in that: horizontal pressure passages are arranged between a hydroturbine runner outlet and a hydroturbine runner inlet, check valve type flap valves M are arranged in the horizontal pressure passages, the horizontal pressure passages are two or more passages which are evenly distributed along the outer circumference of a hydroturbine runner chamber, the hydroturbine runner inlet is over the passages, the hydroturbine runner outlet is under the passages, and the check valve type flap valves M are between the passages. The utility model provides the method and the device which can prevent the hydroelectric generating set from lifting, and the device has the advantages of simple structure, safety and reliability.

Description

A kind of device that prevents machine lifting of water-turbine generator set

Technical field

The utility model belongs to the hydraulic machinery engineering, particularly a kind of device that prevents machine lifting of water-turbine generator set.

Background technique

The part power station of having built up now is as the Syria Di Shilin water power plant of water power plant, Ge Zhou Ba, water-saving Fu Miao water power plant, Hunan, Da Shi water power plant, Anren, numb positive Horse Neck col water power plant, red rock water power plant and the design of northwest survey and design research institute etc., because machine lifting of water-turbine generator set makes the normal operation in power station run into obstacle, can damage the thrust-bearing and the structure member of hydraulic turbine generator when serious.

The hydraulic turbine generator unit is lifted the machine phenomenon, the general main following three kinds of situations that occur in:

1) after the removal of load of hydraulic turbine generator unit, the quick closedown of water turbine guide vane, mainly be to cause water flow sharply to descend to cause runner envelope-tail water pipeline section generation to turn one's coat and hit, generator set is rotated further under action of inertia, be that water turbine changes pump operating condition into by the water turbine operating mode, turbine blade pushes away water to tail water, adds the quick closedown of water turbine guide vane, the effect of hitting of turning one's coat that draft tube produces, water produces hydraulic thrust upwards to blade and lifts unit.

2) bear the hydraulic turbine generator unit of phase modulation task, when unit is converted to the phase modulation operating mode by generating operation mode, the quick closedown of water turbine guide vane, in phase modulation is calmed the anger process, be that generator is changed into motor working condition and sent out load or burden without work drive water turbine rotation (phase modulation operating mode) to system by generating operation mode, make water turbine be converted to pump operating condition by the water turbine operating mode, turbine blade pushes away water to tail water, add the quick closedown of guide vane, the effect of hitting of turning one's coat that draft tube produces, water produces hydraulic thrust upwards to blade and lifts machine.

3) unit that elevation is low, tailwater level is high is installed; axial flow unit particularly; unit is lifted machine at stopping process; when this phenomenon mainly is compressor emergency shutdown; the guide vanes of water turbine quick closedown; the paddle angle diminishes; be that generator set is rotated further under action of inertia; be that water turbine changes pump operating condition into by the water turbine operating mode; turbine blade pushes away water to tail water; add the quick closedown of stopping process stator, the effect of hitting of turning one's coat that draft tube produces, water produces hydraulic thrust upwards to blade and lifts machine.

Summary of the invention

The purpose of this utility model provides a kind of simple in structure, safe and reliable device that prevents machine lifting of water-turbine generator set.

The purpose of this utility model is to realize like this, a kind of method that prevents machine lifting of water-turbine generator set, it is characterized in that: export to the flap valve M that stop valve type is arranged in the flat pressure passage of rotary wheel of water turbine import from rotary wheel of water turbine, when unit is in the normal power generation state, P1＞P2, the flap valve M of check valve closes; When unit was tending towards lifting machine, during P2＞P1, flap valve M opened, and in-channel water is to the upper reaches, and P2 reduces P1 and increases, and makes the stressed P2-P1 of satisfying of water turbine≤G;

In the formula, P1 is downward axial hydraulic thrust (comprising the downward hydraulic thrust that current produce runner crown in the mixed flow unit top cover gap), P2 is axial hydraulic thrust upwards (comprising the hydraulic thrust that makes progress that current produce ring under the runner in the czermak space under the mixed flow unit), and G is the weight of the rotating part of hydraulic generator unit.

According to a kind of device that prevents the method for machine lifting of water-turbine generator set, it is characterized in that: rotary wheel of water turbine exports between the rotary wheel of water turbine import flat pressure passage, and the flap valve M of stop valve type is arranged in the flat pressure passage.

Described flat pressure passage is along the outdoor garden of rotary wheel of water turbine week equally distributed two or greater than two passage, the passage upper end is the rotary wheel of water turbine import, and the passage lower end is the rotary wheel of water turbine outlet, is the flap valve M of stop valve type between the passage.

Described flat pressure passage is provided with by the turbine shaft center, and the flat pressure passage upper end is the rotary wheel of water turbine import, and the flat pressure passage lower end is the rotary wheel of water turbine outlet, is the flap valve M of stop valve type between the flat pressure passage.

The utility model has the advantages that: set up flat pressure passage owing to export to the runner import from rotary wheel of water turbine, a flap valve M who is similar to stop valve type is installed in the passage, or be provided with by the turbine shaft center, the two ends of passage are positioned at rotary wheel of water turbine to be imported and exported, when P2＞P1, flap valve M opens (b position), water is to the upper reaches, and P2 reduces P1 and increases, and makes the P2-P1 difference reduce, be the condition of the stressed P2-P1 of satisfying of water turbine≤G, solve the machine of lifting of hydraulic generator unit.The method that the utility model proposes only is in unit and has the machine of lifting when trend takes place: during P2＞P1, the flap valve M in the flat pressure passage opens, and water stream from bottom to top plays " concora crush " effect, reduces the difference of P2 and P1, in case unit is lifted machine.When unit is in normal power generation state P1＞P2, flap valve M closes (a position), and water can not flow from the top down, and flat pressure passage is not the same with setting up, and does not influence the normal operation of water turbine.Therefore, this method neither influences the water turbine performance, can fundamentally thoroughly solve the machine of the lifting problem of lifting the machine unit again.

Description of drawings

The utility model is described in further detail below in conjunction with embodiment's accompanying drawing:

Fig. 1 is the utility model example structure schematic representation;

Fig. 2 is the A-A direction cut-away view of Fig. 1.

Among the figure: 1, rotary wheel of water turbine; 2, rotary wheel of water turbine outlet; 3, flat pressure passage; 4, guide vanes of water turbine; 5, rotary wheel of water turbine import; 6, the flap valve M of stop valve type.

Embodiment

As shown in Figure 1, from the condition of mechanics angle machine lifting of water-turbine generator set be: the downward axial hydraulic thrust P1 that rotary wheel of water turbine import current produce, the weight G that adds the rotating part of hydraulic generator unit exports the axial hydraulic thrust P2 that makes progress that current produce less than rotary wheel of water turbine, that is:

P1＋G＜P2 (1)

The hydraulic generator unit is just lifted machine, otherwise:

P1＋G≥P2 (2)

Just do not lift machine, this is the mechanical condition of machine lifting of water-turbine generator set.

From force analysis as can be known, the weight of unit is constant, and the machine of lifting depends primarily in the hydraulic turbine operation process, the variation of the axial hydraulic thrust P2 that makes progress that downward axial hydraulic thrust P1 that runner import current produce and rotary wheel of water turbine outlet current produce.In the water turbine operating mode, the downward axial hydraulic thrust P1 that rotary wheel of water turbine import 5 current produce necessarily exports the axial hydraulic thrust P2 that makes progress that 2 current produce greater than rotary wheel of water turbine, certainly can not lift the machine problem, have only guide vanes of water turbine 4 quick closedowns, be that water turbine is in when turning to identical pump operating condition with the water turbine operating mode, just might occur, the downward axial hydraulic thrust P1 that rotary wheel of water turbine import 5 current produce, the weight G that adds the rotating part of hydraulic generator unit exports the axial hydraulic thrust P2 that makes progress that current produce less than rotary wheel of water turbine, the hydraulic generator unit is just lifted machine, and just water produces hydraulic thrust upwards to rotary wheel of water turbine 1 blade and lifts machine.

As shown in Figure 2, a kind of method that prevents machine lifting of water-turbine generator set has flat pressure passage 3 from rotary wheel of water turbine outlet 2 to rotary wheel of water turbine import 5, the flap valve M 6 that stop valve type is arranged in the flat pressure passage 3, when unit is in the normal power generation state, P1＞P2, the flap valve M 6 of stop valve type closes, and in-channel water can not be to dirty; When unit was tending towards lifting machine, during P2＞P1, the flap valve M 6 of check valve opened, and in-channel water is to the upper reaches, and P2 reduces P1 and increases, and makes the stressed P2-P1 of satisfying of water turbine≤G.

Export to the rotary wheel of water turbine import from rotary wheel of water turbine and set up flat pressure passage 3, flat pressure passage all distributes around turbine chamber, the flap valve M 6 of stop valve type is installed in the flat pressure passage, when P2＞P1, flap valve is opened (the b position among Fig. 1), reducing P2 increase P1 makes the P2-P1 difference reduce, if do not consider that theoretically runner advances, the discrepancy in elevation of outlet, the resistance of flap valve and flat pressure passage, it is very little that the enough big P2-P1 difference of flat pressure passage 3 designs just can subtract, but solution is lifted machine and is only required P2-P1≤G, and adopting this method solution unit to lift machine thus is to realize.

3 effects of the utility model flat pressure passage just play one " concora crush " effect to runner inlet/outlet pressure, solution is lifted machine and is only required P2-P1≤G, the weight G of the rotating part of hydraulic generator unit is bigger, flat pressure passage 3 design can by two or two with outer garden week of upper edge runner envelope equally distributed passage realize that concrete form can further come to determine according to specific circumstances.In addition, the flat pressure passage of setting only is in unit and has the machine of lifting when trend takes place: P2＞P1, water stream from bottom to top play " concora crush " effect, reduce the difference of P2 and P1, in case unit is lifted machine.When unit is in normal power generation state P1＞P2, being provided with the flap valve M6(of stop valve type such as a position among Fig. 1 in the flat pressure passage 3) water can not flow from the top down, and flat pressure passage is not the same with setting up, and does not influence the normal operation of water turbine.Therefore, this method neither influences the water turbine performance, can fundamentally thoroughly solve the machine of the lifting problem of lifting the machine unit again.

The flat pressure passage setting also can be provided with by the turbine shaft center in the utility model, and the two ends of passage are positioned at the rotary wheel of water turbine inlet/outlet, and the flap valve M 6 of check valve is set in the passage.Same when unit is in the normal power generation state, P1＞P2, the flap valve M of check valve closes; When unit was tending towards lifting machine, during P2＞P1, flap valve M opened, and in-channel water is to the upper reaches, and P2 reduces P1 and increases, and makes the stressed P2-P1 of satisfying of water turbine≤G.

Claims

1. device that prevents machine lifting of water-turbine generator set, it is characterized in that: rotary wheel of water turbine exports between the rotary wheel of water turbine import flat pressure passage, and the flap valve M of stop valve type is arranged in the flat pressure passage.

2. a kind of device that prevents machine lifting of water-turbine generator set according to claim 1, it is characterized in that: described flat pressure passage is along the outdoor garden of rotary wheel of water turbine week equally distributed two or greater than two passage, the passage upper end is the rotary wheel of water turbine import, the passage lower end is the rotary wheel of water turbine outlet, is the flap valve M of stop valve type between the passage.

3. a kind of device that prevents machine lifting of water-turbine generator set according to claim 1, it is characterized in that: described flat pressure passage is provided with by the turbine shaft center, the flat pressure passage upper end is the rotary wheel of water turbine import, the flat pressure passage lower end is the rotary wheel of water turbine outlet, is the flap valve M of stop valve type between the flat pressure passage.