CN2248274Y

CN2248274Y - Self-pressing stop valve

Info

Publication number: CN2248274Y
Application number: CN 95240751
Authority: CN
Inventors: 黄兴明; 孙华昆
Original assignee: Individual
Current assignee: Individual
Priority date: 1995-10-26
Filing date: 1995-10-26
Publication date: 1997-02-26
Anticipated expiration: 2005-10-26

Abstract

The utility model relates to a self-pressing stop valve. In the utility model, the inside of a piston cylinder on the upper part of a valve body is provided with a piston with an orifice, and the piston is movably matched with the wall of the piston cylinder; the lower part of the piston is provided with a connecting rod connected with a valve core; the upper part of the piston cylinder on the valve body is provided with pressure lifting pipe with a control switch, and the pressure lifting pipe is communicated with a pipeline on the lower end of fluid; by the control of the on-off of the switch of the pressure lifting pipe, the opening and the closure of the valve can be realized. The utility model which has the advantages of simple structure, good sealing performance, low cost, and wide application.

Description

Wear only valve from pressure

The utility model relates to fluid control field, is specially adapted to a kind of structure from pressure cutoff valve of utilizing fluid self pressure to flow by fluid.

The fluid stop valve that generally uses all is to impose on mechanical force at present, spool and valve body lip is coincide seal, and reaches the purpose that fluid is ended, but when this valve ended at convection cell, liquid had the trend that makes spool leave the valve body lip to the action direction of spool, and leak poor reliability easily.

Task of the present utility model is: design a kind of new structure from pressure cutoff valve, make fluid be the trend that spool and valve body lip compress to the force direction of spool, and hydrodynamic pressure is high more, spool and valve body lip coincide and seal tightly more, overcome present fluid stop valve and leak easily, the defective of poor reliability.

The technical solution of the utility model is: the piston of design one and casing wall band throttle orifice movingly in the valve body piston cylinder, the connecting rod of piston bottom connects spool, the pressure lifting pipe of valve body piston cylinder upper design one band control switch its designing technique key that communicates with the valve body lower end fluid line is, throttle orifice internal diameter on the piston is less than the internal diameter of pressure lifting pipe, the diameter of piston is greater than the diameter of spool, valve core diameter will satisfy the technical requirements that can compress the valve inner lip, should be greater than the diameter of lip.Control switch can be can be solenoid valve manually, also, temperature detect switch (TDS) etc.

Fig. 1 is the utility model structure opening state sectional drawing

Fig. 2 is the utility model structure closed condition sectional drawing

Among the figure: 1 pressure lifting pipe, 2 pistons, 3 piston cylinders, 4 control switchs, 5 connecting rods, 6 spools, 7 lips, 8 valve bodies, 9 throttle orifices, 10 fluids upper end, 11 fluid lower ends.

Further introduce technology contents of the present utility model below in conjunction with accompanying drawing:

The inwall of the piston cylinder 3 on piston 2 and valve body 8 tops movingly, throttle orifice 9 is arranged on the piston 2, and piston 2 bottoms have connecting rod 5 to link to each other with spool 6, and the pressure lifting pipe 1 that communicates with cylinder body is arranged at piston cylinder 3 tops, control switch 4 is arranged on it, the other end of pressure lifting pipe 1 communicates with pipeline 11 under the fluid, the lip 7 that flows for fluid is arranged, in valve body 8 chambeies in Fig. 1, control switch 4 is opened, pressure lifting pipe 1 communicates with the valve low pressure area, and in the moment of opening, low pressure area pressure is atmospheric pressure P ₀Less than the zone of high pressure pressure P ₁, P ₀＜P ₁The last area of plane of piston 2 is A ₁, the lower plane area is A ₂, the last area of plane of spool 6 is A ₃, P ₁(A ₁-A ₃)=F, the buoyant weight of piston 2 connecting rods 5 spools 6 (gravity and buoyancy poor) is W, applied fluid mechanics theoretical calculation W determines the diameter of piston 2 and spool 6, makes F＞W+P ₀A ₁, then piston 2 moves up under fluid pressure action, and spool 6 leaves valve body lip 7, opening of valves.Behind the opening of valves, the zone of high pressure fluid flows into low pressure area, if low pressure area is uncovered, and P ₂≈ P ₃≈ P0, promptly piston upper chamber is kept atmospheric pressure P ₀, guaranteeing that piston 2 rests on piston cylinder 3 upper ends, opening of valves is in stable condition.If long pipeline, P ₂The zone of high pressure is little thereupon in meeting), during structural design, Bernoulli's equation calculating pressure fall way 1 internal diameter of applied fluid mechanics makes it to reach the negative pressure-pumping degree, then P ₃＜P ₀See that thus the opening state of valve remains stable.Be depressurized and P as for the small volume of fluid that flows into piston upper chamber through throttle orifice 9 ₃Equate, flow into low pressure area through pressure lifting pipe 1.So as long as control switch 4 is leaving, piston 2 just can be parked in piston cylinder 3 tops always, open stable from pressure cutoff valve.

In Fig. 2, control switch 4 cuts out, and the fluid that flows into piston 2 epicoeles through throttle orifice 9 increases P gradually ₃Pressure also increases, final P ₃=P ₁, this moment F=0, the moment fluid that control switch 4 cuts out is still flowing, and during structural design, can calculate piston 2, connecting rod 5, spool 6 physical dimensions by the fluid mechanics Bernoulli's equation, makes it at this state piston 2, connecting rod 5, spool 6 can free settlings.Need by structural design, the equivalent particle diameter of piston 2, connecting rod 5, spool 6 is more much bigger than the particle diameter that accounting equation regulation in the fluid mechanics is suitable for, considerably beyond the free particles suspended diameter of energy, when F=0, piston 2, connecting rod 5, spool 5 are realized free settling, when reducing to after spool 6 coincide with valve body lip 7, hydrodynamic pressure is born on the plane on the spool 6, fluid is ended by self pressure, because spool 6 diameters are greater than the diameter of lip 7, it is tight more that spool 2 and lip 7 are pressed more, do not leak.

The utility model has following advantage and effect:

1, good airproof performance, do not leak;

2, using different control switchs instead can realize automatically or distant control;

3, simple in structure, the with low cost and available present common valve transformation of the way.

Claims

1, a kind of from pressure cutoff valve, it is characterized in that: piston cylinder 3 is arranged at valve body 8 tops, the inwall of piston 2 and piston cylinder 3 movingly, throttle orifice 9 is arranged on the piston 2, the bottom has connecting rod to link to each other with spool 6, and the pressure lifting pipe 1 that communicates with cylinder body is arranged at piston cylinder 3 tops, and control switch 4 is arranged on it, the other end of pressure lifting pipe 1 communicates with fluid lower channel 11, and lip 7 is arranged in the chamber of valve body 8.

2, a kind of from pressure cutoff valve according to claim 1, it is characterized in that: throttle orifice 9 internal diameters on the piston 2 are less than the internal diameter of pressure lifting pipe 1, and the diameter of piston 2 is greater than the diameter of spool 6, and the diameter of spool 6 is greater than the diameter of lip 7.