CN86209489U

CN86209489U - Plunger valve with auxiliary sealing washer

Info

Publication number: CN86209489U
Application number: CN 86209489
Authority: CN
Inventors: 陈星止; 潘强; 顾铁
Original assignee: WUXI COLLIERY MACHINE PLANT
Current assignee: WUXI COLLIERY MACHINE PLANT
Priority date: 1986-11-20
Filing date: 1986-11-20
Publication date: 1987-10-07

Abstract

The utility model discloses a control valve used for emulsion and water as fluid, belonging to field of mechanical. The utility model is characterized in that an auxiliary sealing washer is arranged on the low-tension side of an O-ring, playing the role of throttling, and preventing the O-ring from flushing by meeting with high-speed flow. The radial clearance between the auxiliary sealing washer and the plunger is zero, making the radial discharging liquid hole of the plunger without liquid stream or a small amount of liquid stream to jet when passing the O-ring, thereby, protecting the O-ring.

Description

Plunger valve with auxiliary sealing washer

The present invention relates to the plunger valve that emulsified liquid and water are working solution, belong to mechanical field.

At present, be extensive use of plunger valve both at home and abroad.Fig. 1 is homemade plunger valve structural drawing.The left side of valve communicates with the column cavity of resorption, and along with roof pressure increases, the corresponding increasing of cavity pressure under the column also strengthens the hydraulic coupling that acts on the plunger (1), forces spring (3) compression, and plunger (1) moves to right.After the radially leakage opening (5) on the plunger (1) was crossed O shape sealing (6), valve was unlocked, and high pressure liquid penetrates from leakage opening (5), penetrated liquid and flowed through after restrictor ring (7) throttling that is positioned at O-ring seals (6) low voltage side inflow valve casing (4), discharge.Behind the opening of valves, cavity pressure descends under the column, and to moving to left, after leakage opening (5) was covered by O-ring seals (6) fully, valve stopped drainage to plunger (1) under the spring force effect.

For movingly, the O ring recess is an internal channel between plunger (1) and the plunger bushing (2), opens in plunger bushing (2).Adjacent O-ring seals (6) low voltage side has a throttling link (7).

The deficiency of this valve is: the life-span of O shape seal valve (6) and the performance of valve are difficult to take into account.Cause O-ring seals (6) failure reasons to mainly contain: (1) O-ring seals (6) is snapped bad when embedding the low voltage side gap.(2) high pressure liquid stream washes away.The high-speed liquid that penetrates from leakage opening (5) radially flows direct directive O-ring seals (6), causes after the rubber of O-ring seals (6) is peeled off losing efficacy.The present method that adopts is that the matching gap that plunger is paid is as best one can little, to prolong the working life of O-ring seals.But the too small difficulty of processing in gap is big, and the part form and position tolerance is difficult to reach requirement in addition, causes plunger motion dumb, has influenced the performance of closing of valve.Otherwise, loosened matching gap, plunger (1) motion is flexible, though performance makes moderate progress, the embedding and the souring of O-ring seals (6) are serious, cause O-ring seals (6) to lose efficacy in advance.

The objective of the invention is: the performance of solution plunger valve and the contradiction between the working life of O-ring seals (6).

Design a kind of plunger valve, Fig. 2 is this valve schematic representation.Establish a throttling sheet (9) in O-ring seals (6) low voltage side, its effect is to make O-ring seals (6) groove become end face groove, is convenient to processing, detects.The loading and unloading O-ring seals.Adopt transition fit between throttling sheet (9) and the plunger bushing (2).Adopted the matching gap of pine between plunger (1) and plunger bushing (2), plunger (1) and the throttling sheet (9), plunger (1) motion is flexible like this, and the performance of valve is greatly improved.For the embedding that prevents O-ring seals (6) and wash away, an auxiliary seal ring (8) be set in the low voltage side of O-ring seals, this valve is characterised in that: before the assembling, be interference fit between auxiliary seal ring and the plunger (1), to make a kerf on the auxiliary seal ring (8) during assembling, make this circle under external force can resiliently deformable.Assembling simultaneously for convenience is processed with the transition angle at an end of plunger (1).Auxiliary seal ring (8) promptly is close on plunger (1) periphery after the transition angle imports.As shown in Figure 3.Obtained the zero clearance like this.Owing to the principle that the drainage amount by the annular space is directly proportional with the cube in gap, this auxiliary seal ring (8) has stronger throttling action.Though auxiliary seal ring (8) is zero with the gap of plunger (1), because of its width is very little, adds that the friction factor between auxiliary seal ring (8) and plunger (1) is very little, so plunger motion is still very flexible, the performance of valve is not reduced because of throttling action.Auxiliary seal ring (8) can prevent effectively that O-ring seals (6) from embedding to low voltage side.The more important thing is, when the radially leakage opening (5) on the plunger (1) has just been crossed O-ring seals (6), because the throttling action of auxiliary seal ring (8), making the liquid of ejaculation from leakage opening (5) radially is seldom, and O-ring seals (6) has exempted from the harm that liquid stream washes away.When radially leakage opening (5) leading edge was stretched out from auxiliary seal ring (8), drainage amount, flow stream velocity suddenly increased strongly.But what this moment, high velocity liquid stream washed away is that the intensity polyoxymethylene much higher than rubber made auxiliary seal ring.Auxiliary seal ring (8) has been protected O-ring seals (6) effectively like this.Prolonged its working life.Plunger (1) motion has simultaneously guaranteed good closed performance flexibly.

Claims

1, a kind ofly be used for emulsified liquid or water is the plunger valve of working solution, by plunger (1), plunger bushing (2), O-ring seals (6), spring, auxiliary seal ring (8), throttling sheet compositions such as (9).Its special being: the low voltage side at O-ring seals (6) is provided with an auxiliary seal ring of being made by polyoxymethylene (8); Before the interior hole dimension assembling of auxiliary seal ring (8) and the pass of plunger (1) is an interference fit before the assembling; And on auxiliary seal ring (8), have angular cut.