CN203348688U - Self-aligning type air buffering device - Google Patents

Abstract

The utility model discloses a self-aligning type air buffering device. An inner valve tube with a vent hole and air inlet holes is arranged in an inner sleeve sliding tube with the upper end being provided with air holes and an inner sliding ring through a guide cover, a cut-off spring, a baffle ring and a stop pin, and then an outer fixing sliding ring and an upper fixing bolt are used for enabling the inner sleeve sliding tube to be connected below an upper cover in a sliding mode. A lower fixing bolt is used for enabling an outer sliding tube with the external diameter part being provided with adjusting threads to be fixed on a valve shaft flange arranged at the upper end of a valve shaft. The adjusting threads are used for enabling an adjusting nut to be screwed on the outer sliding tube to compress a certain amount of a main spring, the inner sleeve sliding tube is inserted into the outer sliding tube, and an upper bolt fixes the upper cover on a flange of a valve cylinder. The self-aligning type air buffering device is simple and ingenious in structure, and will surely be applied to the field of water turbine vacuum breaking valves and other relevant fields.

Description

The self-centering type air buffer

Technical field:

The utility model is a kind of for the damping device on the water turbine vacuum breaker valve.

Background technique:

Current, for the product of water turbine vacuum breaker valve, have severally, a kind of is to do buffer medium with turbine oil, due to cushion plugs and buffering casing wall decentraction, causes leakage of oil and loses pooling feature; Another kind adopts pressurized air to be cushioned, sort buffer apparatus structure complexity, again can not be in 360 ° the self-regulated center, be only with a cross joiner, damper piston and valve shaft to be connected together, can only on four direction, adjust the concentricity of damper piston and valve shaft; Only guaranteed moving element and fixed component have good concentricity, the open and close of guarantee vacuum breaker valve freely, tonifying Qi is smooth and easy, if it is bad that concentricity is adjusted, install and complexity will cause vacuum breaker valve, in the tonifying Qi process, jam occurs, between valve shaft and guide rail, frictional force is excessive, causes tonifying Qi freely not produce whister-type noise, make water turbine produce vibration, endanger whole hydraulic generator unit.

Summary of the invention:

The utility model aims to provide a kind of energy and solves the technological scheme that there is defect in current water turbine vacuum breaker valve damping device, both simple in structure, can freely adjust concentricity in 360 ° again, eliminate fully between valve shaft and guide rail because decentraction causes jam and the excessive situation of frictional force.It has main spring, valve shaft, valve cylinder, fixed plate, valve gap and valve port seat, it is characterized in that, internal valve pipe lower end is provided with interior valve gap and covers and wear an exhaust port at internal valve, the side of internal valve pipe has 2～4 inlet holes, breathing pipe is arranged in the middle of the internal valve pipe, the internal valve pipe through external diameter with the pilot seal hole on the guide cover of internal thread after, cutoff spring from be inserted in internal valve pipe upper end, press again baffle ring on cutoff spring, block baffle ring with backing pin through internal valve pipe upper end, with internal thread, guide cover is fixed on to inboard, inner sleeve slip pipe lower end, inner sleeve slip pipe upper end has 2～4 vents, inner sleeve slip pipe top edge is with interior slip ring, interior slip ring is used fixing bolt by the fixing outer slip ring with fixing annular distance and is slidably connected on the upper cover central position, interior slip ring and the fixing all corresponding radial surfaces of outer slip ring all have the gap value of 3～5mm, with lower fixing bolt, outer sliding tube is fixed on the valve shaft flange of valve shaft upper end, main spring is inserted in to outer sliding tube to be placed in valve cylinder, adjusting nut with a plurality of adjusting holes is screwed on outer sliding tube by adjusting screw thread, make adjusting nut compress certain distance to main spring by calculating, after inner sleeve slip pipe with upper cover is inserted to outer sliding tube, using bolt is fixed on upper cover on the flange of valve cylinder upper end.

The technique effect that the technological scheme that the utility model provides reaches is such: interior slip ring does not have the axial clearance amount between slip ring and upper cover outside fixing, can in 360 °, be free to slide, make it not be subject to external force, good with the valve shaft concentricity, interior slip ring and the fixing all corresponding radial surfaces of outer slip ring all have the gap value of 3～5mm, for the automatic adjustment amount of concentricity, and it is very smooth that interior slip ring and fixing outer slip ring contact connecting surface, in, between slip ring, level can be freely movable at upper cover and outside fixing for slip ring, be fixed on the excessive and relevant stress that is unfavorable for vacuum breaker valve work of frictional force that the outer sliding tube on valve shaft causes to inner sleeve slip pipe decentraction with elimination.Under strong vacuum and barometric pressure effect that valve gap produces in the hydraulic turbine operation process, move down rapidly and open while filling into air, valve shaft compresses main spring to greatest extent by outer sliding tube and the adjusting nut be fixed on the valve shaft flange, at this moment valve shaft flange upper surface, guide cover lower surface and outer sliding tube internal surface space form the moment vacuum, after this vacuum will make the air in valve cylinder compress cutoff spring by vent, breathing pipe, inlet hole and exhaust port, enter the space that this forms vacuum moment, this space vacuum is eliminated and is full of air.When vacuum that water turbine forms, because of after filling into the large quantity of air elimination, valve gap will, under the effect of main spring, return and close rapidly; Simultaneously, under the cutoff spring effect, internal valve Guan Shangyi closes interior valve gap, the air in this space can only be discharged from exhaust port, the exhaust port diameter requires to adjust processing according to buffering, do not have the air of discharge just compressed, thereby amount of movement on valve gap is played to buffer function, avoided producing strong shock between valve gap and valve port seat when closing, cause valve body to damage.Because inner sleeve slip pipe and outer sliding tube are that high-precision slide coordinates, and the gap value of 3～5mm is arranged as adjustment amount between interior slip ring and fixing outer slip ring, therefore the concentricity of the two all should be consistent in any position with the concentricity of valve shaft, in 360 °, all can automatically adjust.The cross joiner adopted in the prior art scheme and damper piston not only can't realize that in 360 ° of scopes, full angle is adjusted concentricity, and complex structure, and the cross joiner can only be adjusted concentricity on four direction.

The utility model is simple in structure, it is ingenious to design, technique effect is perfect, compared with prior art there is novelty, creativeness, practicability and significant progressive, production technology is simple, practical, will be widely used in hydroelectric power field and other association area.

The accompanying drawing explanation:

Fig. 1. self-centering type air buffer plan view

Wherein:

1, upper cover 2, upper bolt 3, fixing annular distance

4, upper fixing bolt 5, fixing outer slip ring 6, interior slip ring

7, vent 8, baffle ring 9, backing pin

10, outer sliding tube 11, adjustment screw thread 12, flange

13, breathing pipe 14, cutoff spring 15, adjusting nut

16, adjusting hole 17, guide cover 18, main spring

19, lower fixing bolt 20, valve shaft flange 21, valve shaft

22, valve cylinder 23, fixed plate 24, valve gap

25, valve port seat 26, exhaust port 27, interior valve gap

28, inlet hole 29, pilot seal hole 30, internal thread

31, inner sleeve slip pipe 32, internal valve pipe

Embodiment:

In internal valve pipe (32) lower end, interior valve gap (27) is arranged, have an exhaust port (26) on interior valve gap (27), internal valve pipe (32) has breathing pipe (13), in internal valve pipe (32) lower end, also has 2～4 inlet holes (28).Internal valve pipe (32) through external diameter with the pilot seal hole (29) on the guide cover (17) of internal thread (30) after, cutoff spring (14) is enclosed within to internal valve pipe (32) upper end, and press baffle ring (8), with backing pin (9), baffle ring (8) is fixed on to internal valve pipe (32) upper end, by internal thread (30), guide cover (17) is fixed on to inner sleeve slip pipe (31) interior lower end.Upper end is used to fixing bolt (4) with the inner sleeve slip pipe (31) of 2～4 vents (7) and interior slip ring (6) by fixing outer slip ring (5) to be connected on upper cover (1) central position.With lower fixing bolt (19), external diameter is fixed on the valve shaft flange (20) of valve shaft (21) upper end with the outer sliding tube (10) of adjusting screw thread (11), after main spring (18) is inserted in to outer sliding tube (10), be placed in valve cylinder (22), adjusting nut with adjusting hole (16) (15) is screwed to above outer sliding tube (10) by adjusting screw thread (11), and compression main spring (18).Band inner sleeve slip pipe (31) and the upper cover (1) of fixing outer slip ring (5) are used on the flange (12) that bolt (2) is fixed on valve cylinder (22).Implement complete.

Claims (1)

1. a self-centering type air buffer, it has main spring, valve shaft, valve cylinder, fixed plate, valve gap and valve port seat, it is characterized in that, internal valve pipe lower end is provided with interior valve gap and covers and wear an exhaust port at internal valve, the side of internal valve pipe has 2～4 inlet holes, breathing pipe is arranged in the middle of the internal valve pipe, the internal valve pipe through external diameter with the pilot seal hole on the guide cover of internal thread after, cutoff spring from be inserted in internal valve pipe upper end, press again baffle ring on cutoff spring, block baffle ring with backing pin through internal valve pipe upper end, with internal thread, guide cover is fixed on to inboard, inner sleeve slip pipe lower end, inner sleeve slip pipe upper end has 2～4 vents, inner sleeve slip pipe top edge is with interior slip ring, interior slip ring is used fixing bolt by the fixing outer slip ring with fixing annular distance and is slidably connected on the upper cover central position, interior slip ring and the fixing all corresponding radial surfaces of outer slip ring all have the gap value of 3～5mm, with lower fixing bolt, outer sliding tube is fixed on the valve shaft flange of valve shaft upper end, main spring is inserted in to outer sliding tube to be placed in valve cylinder, adjusting nut with a plurality of adjusting holes is screwed on outer sliding tube by adjusting screw thread, make adjusting nut compress certain distance to main spring by calculating, after inner sleeve slip pipe with upper cover is inserted to outer sliding tube, using bolt is fixed on upper cover on the flange of valve cylinder upper end.

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