CN206530713U - Float-type double containment tonifying Qi valve arrangement - Google Patents

Abstract

The utility model discloses a kind of float-type double containment tonifying Qi valve arrangement, when unit is normally run, valve (3) is in closed positions under spring (1) effect, and floating drum (5) is placed in float chamber (4) bottom, in fully open position.When needing tonifying Qi, valve (3) is opened into fully open position and carries out tonifying Qi, when tailwater level reaches aeration valve position, floating drum (5) floats to closed positions under buoyancy, realizes that valve (3) and floating drum (5) bivalve seal the function of waterproof.The utility model aeration valve has self closing and the function from unlatching.Successful application of the present utility model, enriches China's hydraulic turbine main shaft centre bore aeration valve structure type；The utility model has the advantages that：Aeration valve flexible movements, being capable of self closing, certainly unlatching.Aeration valve tonifying Qi works well, and sealing property is reliable, simple in construction, manufacture, easy for installation.

Description

Float-type double containment tonifying Qi valve arrangement

Technical field：

The utility model is related to a kind of float-type double containment tonifying Qi valve arrangement

Background technology：

Current hydraulic turbine main shaft centre bore aeration valve is mainly a kind of conventional spring valve.When power plant tail water position is higher, When supplement air valve uses double sealing structure, often all it is installed in series using two kinds of valves of spring valve and ball-cock assembly and arranges composition valve group Mode come meet power station require.

Conventional springs valve arrangement is as shown in figure 1, spring valve sheet is as non-return valve, and valve (3) is general under spring (1) effect In small guide vane opening or closed mode, exceed design when the hydraulic turbine deviates vacuum in optimum operating condition operation, draft tube During guarantee value, valve (3) is opened, and tonifying Qi is carried out to the hydraulic turbine.This aeration valve is simple in construction, and closed positions valve connects with valve seat Contacting surface is sealing surface.When tailwater level reaches or even be higher by aeration valve position, valve (3) closes water shutoff.For tailwater level Higher than the unit of aeration valve position, sealed because this aeration valve only has at one, therefore its sealed reliability and unit Security is relatively weaker.

The tonifying Qi valve block structure that spring valve and ball-cock assembly are installed in series is as shown in Fig. 2 this tonifying Qi valve arrangement is in spring The valve group that valve (1) arranged beneath ball-cock assembly (2), spring valve (1) and ball-cock assembly (2) are constituted is arranged in air admission to main shaft central hole pipe (3) on.Spring valve (1) and ball-cock assembly (2) are non-return valve.When unit is normally run, spring valve (1) is in closed positions, floats Ball valve (2) is in fully open position, when hydraulic turbine tailwater level reaches or even be higher by aeration valve position, and ball-cock assembly (2) is floating Float under power effect to closed positions, so that spring valve (1) and ball-cock assembly (2) play a part of seal water-sealing.This valve group Although formula arrangement can realize the effect of double containment waterproof, it is complicated, it is necessary to arrangement space it is big, manufacture and overhaul Maintenance cost is higher.

The content of the invention：

The purpose of this utility model, which is to provide, a kind of has that double containment function, sealing property be reliable, simple in construction, maintenance dimension Protect convenient float-type double containment tonifying Qi valve arrangement.The purpose of this utility model is achieved through the following technical solutions：Floating drum Formula double containment tonifying Qi valve arrangement, the structure is by spring (1), buffer unit (2), valve (3), float chamber (4), floating drum (5), valve seat (6), blowdown pipe (7) is constituted, and spring (1) is compressed on buffer unit (2), and spring (1) bottom is valve (3), the full row of valve Journey is L, and valve (3) is corresponding with float chamber (4) position of bottom, and float chamber (4) are placed on valve seat (6), and valve seat (6) is placed in tonifying Qi Manage on (7), provided with sealing (8) between valve seat (6) and blowdown pipe (7) flange, floating drum (5) is placed in float chamber (4) bottom, float chamber (4) through hole is opened up on.

Technique effect：

Some current power station hydraulic turbine tailwater levels are higher, reached in flood level and are higher by aeration valve position, very When normally being run to some Hydropower Plants, hydraulic turbine tailwater level has just exceeded aeration valve position, therefore for tailwater level Higher turbine-generator units, aeration valve is while ensureing to have enough tonifying Qi abilities, and its sealing property is also particularly important.It is high Tailwater level power station often all proposes the requirement of double sealing structure to be had to hydraulic turbine main shaft centre bore aeration valve.

Float-type double containment tonifying Qi valve arrangement as shown in figure 3, be to be additionally arranged float valve on the basis of conventional springs valve arrangement, Two kinds of valves are united two into one, so as to realize double containment function.

The utility model as shown in figure 3, valve (3) is lower in closed positions in spring (1) effect when unit is normally run, Valve total travel is L.Floating drum (5) is placed in float chamber (4) bottom, in fully open position.Float chamber opens up through hole on (4), works as water Turbine deviates optimum operating condition and run, and when vacuum exceedes design certified value in draft tube, valve (3) is opened into fully open position, gas Body enters in air admission to main shaft central hole pipe via through hole on valve (3), float chamber (4), and reaches in draft tube, destruction draft tube Vortex rope, improve operating states of the units.When tailwater level reaches or even be higher by aeration valve position, floating drum (5) is in water buoyancy Float under effect to closed positions, so as to realize that floating drum (5) and tonifying Qi valve (3) bivalve seal the effect of waterproof.

This combined valve is simple in construction, and installation and repairing is convenient, i.e., with enough tonifying Qi abilities and good tonifying Qi Effect, can effectively improve the reliability of valve seal again, leak at aeration valve during reduction high tailrace level, or even water logging generator Risk, improve unit operation reliability and security.The utility model concrete structure is shown in Fig. 3.This tonifying Qi valve arrangement Advantage is：

1) flexible movements, being capable of self closing, certainly unlatching；

2) enough, tonifying Qi works well tonifying Qi ability；

3) simple in construction, installation and repairing is convenient；

4) installing space is saved, reduction making-up air device exposes the height on generator floor；

Operation principle：

The utility model is a kind of float-type double containment tonifying Qi valve arrangement for composition that spring valve and float valve unite two into one, Spring valve and float valve are non-return valve.When unit is normally run, the valve (3) in spring valve is under spring (1) effect Closed positions, floating drum (5) is placed in float chamber (4) bottom, in fully open position.Float chamber opens up through hole on (4), and this some holes is in machine During group tonifying Qi, gas passage is used as, it is ensured that the vortex rope that gas enters in draft tube, destruction draft tube, improve operating states of the units. When tailwater level reaches or even be higher by aeration valve position, the through hole in float chamber is then as water stream channel, it is ensured that floating drum (5) It is immersed in the water.Floating drum (5) is thin cylinder, and in order to ensure that floatability is good, its weight should not be too heavy, it is ensured that when floating drum (5) floats Immersion liquid level there is safe distance apart from floating drum valve sealing surface.

It is suitable that the volume and weight of float-type double containment aeration valve structural requirement floating drum of the present utility model must have Proportioning, it is ensured that floating drum has good floatability in itself, again the stiffness with the standard that meets and use requirement, it is ensured that floating Cylinder is not damaged by during floating and under external force effect, and will not produce injurious deformation.This aeration valve because by spring valve and Float valve unites two into one so that tonifying Qi valve arrangement is relatively easy, reduces the arrangement space of making-up air device, when tailwater level reaches very To when being higher by tonifying Qi position, spring valve and the fully closed waterproof of float valve twice valve, therefore aeration valve sealing effectiveness is reliable.

Brief description of the drawings：

Fig. 1 is prior art spring valve structural representation

Fig. 2 is prior art spring valve and ball-cock assembly combined type valve group structural representation

Fig. 3 is the utility model float-type double containment aeration valve structural representation

Embodiment：

A kind of float-type double containment tonifying Qi valve arrangement as shown in Figure 3, the structure is by spring 1, buffer unit 2, valve 3, floating Cylinder room 4, floating drum 5, valve seat 6, blowdown pipe 7 are constituted, and spring 1 is compressed on buffer unit 2, and the bottom of spring 1 is valve 3, valve Total travel is L, and valve 3 is corresponding with the position of float chamber 4 of bottom, and float chamber 4 is placed on valve seat 6, and valve seat 6 is placed on blowdown pipe 7, Provided with sealing 8 between valve seat 6 and the flange of blowdown pipe 7, floating drum 5 is placed in the bottom of float chamber 4, float chamber 4 and opens up through hole.

When unit is normally run, valve 3 is fully closed, and floating drum 5 is placed in the bottom of float chamber 4, is shown in a fully open operation.Work as the hydraulic turbine Deviate optimum operating condition operation, vacuum exceedes design certified value, it is necessary to valve (3) outer draught head work inside during tonifying Qi in draft tube Automatically turned on lower, gas enters in valve seat 6 and air admission to main shaft central hole pipe 7 via through hole in valve 3, float chamber 4, and reaches Vortex rope in draft tube, destruction draft tube, improves operating states of the units.When tailwater level reaches or even be higher by aeration valve position When, it is necessary to the when of sealing, floating drum 5 floats to closed positions under water buoyancy effect, so as to realize floating drum 5 and the bivalve of tonifying Qi valve 3 Seal the effect of waterproof.

The utility model successfully solves the risk that the sealing of spring valve single valve exists for high tailrace level unit, while Spring valve and ball-cock assembly arranged in series are solved, because space is nervous, difficult arrangement, manufacturing cost is higher, install, overhaul and safeguard Inconvenient the problem of；By practice examining, the utility model structure reaches ideal effect, realize tonifying Qi work well, sealing Can reliable function；Successful application of the present utility model, enriches China's hydraulic turbine main shaft centre bore aeration valve structure type；This The advantage of utility model is：Valve mechanism is simple, flexible movements, manufacture, easy for installation, and tonifying Qi works well, and sealing property can Lean on.

Claims (1)

1. a kind of float-type double containment tonifying Qi valve arrangement, it is characterized in that：The structure is by spring (1), buffer unit (2), valve (3), float chamber (4), floating drum (5), valve seat (6), blowdown pipe (7) composition, spring (1) are compressed on buffer unit (2), spring (1) bottom is valve (3), and valve total travel is L, and valve (3) is corresponding with float chamber (4) position of bottom, and float chamber (4) are placed in On valve seat (6), valve seat (6) is placed on blowdown pipe (7), provided with sealing (8), floating drum between valve seat (6) and blowdown pipe (7) flange (5) float chamber (4) bottom is placed in, float chamber opens up through hole on (4).