CN101886719A

CN101886719A - Elastic tube seal valve

Info

Publication number: CN101886719A
Application number: CN 201010216522
Authority: CN
Inventors: 曾沂水
Original assignee: Individual
Current assignee: Individual
Priority date: 2010-07-05
Filing date: 2010-07-05
Publication date: 2010-11-17

Abstract

The invention relates to an elastic tube seal valve. Valves, which are extensively used in industry, agriculture and various other industries, have the problem of leakage to different degrees. Leakage has two types, external leakage and internal leakage, wherein the internal leakage means that the valve is not tightly closed. The invention aims to solve the problem of valve leakage which is difficult to solve up to the present. On the basis of using the maximum low pressure (smaller than or equal to 2.5 MPa) cut-off valves, the elastic tube seal is used instead of the traditional filler or seal ring, which means that the traditional dynamic seal at the valve stem is converted into a static seal to thoroughly solve the problem of external leakage of the cut-off valves. The cut-off valve for negative pressure systems can be converted into a special vacuum valve for negative pressure systems by inverting the elastic seal tube. The elastic seal tube is processed by sandwiching high-strength stretch yarn synthetic fiber knitted fabric in the high-elasticity high-strength rubber. In order to reduce internal leakage of the cut-off valve, the seal between the valve core and the valve base of the cut-off valve is converted into O type seal ring seal from two abraded hard planes which are in close contact in the traditional way.

Description

Elastic tube seal valve

Technical field:

Each field of industrial or agricultural

Technical background and characteristics of the present invention:

The leakage problem of various degrees always just from widely used valve is born from its in each field such as industrial or agricultural.Leakage is divided into interior leakage and leaks outside, and interior leakage is meant that valve fits badly; Leak outside and be meant that material is from the past external leakage of the sealing part of valve rod.The present invention designs for these two problems that solve the most widely used stop valve.

1. leaking outside of valve to using certain hour and the frequent valve of switch, because the stuffing box packing at valve rod place or seal ring (ring) wear and tear, loosening or valve rod corrosion, caused the leakage of material.This does not singly cause the waste of material, and, deep-etching inflammable and explosive, poisonous for some, active material from leakage can cause serious environmental to pollute and potential safety hazard.Owing to the motive sealing that is sealed at valve rod place, can't accomplish zero leakage, for the very strong material of some osmotic forces, as liquefied ammonia, kerosene etc., as long as the frequent open and close of this valve, the seepage of sealing part is inevitably, at most just seepage degree difference.Inflammable and explosive to some, the extremely strong material of big or volatility of toxicity or corrosivity requires extremely tight place to the leakage of valve, and at present industrial have two kinds of valves to select for use; 1). rubber lined diaphragm (or enamel membrane valve); 2). bellow sealed valve.These two kinds of valves rely on the interior or exterior space isolation with valve of diaphragm of rubber fabric of enhancing (in accompany) and corrugated stainless steel tubing, have guaranteed that material reveals anything but.For membrane valve, working pressure limited (0.6MPa following), switch is frequent or damage barrier film easily when pressing too tightly when closing, and the life-span is limited, thereby needs periodic replacement, and it is also handy not as stop valve using membrane valve to regulate flow.For bellow sealed valve, sealing is reliable, and working pressure is also than membrane valve height, but can not bear excessive pressure reduction inside and outside the bellows of bellow sealed valve, the pipe external space must be led to the water with certain pressure, with the equilibrium valve internal pressure, eliminates the inside and outside pressure reduction of bellows.The Bellows valves price is more expensive in addition, has only minority to require extremely tight place to revealing, and selects for use just now as the epochmaking ground such as biphenyl of radioactive material of nuclear industry band or high temperature, and using scope is wideless.The material of deep-etchings such as example hydrochloric acid can not use.

The present invention adopts the spring tube of a good springiness that the valve interior or exterior space is separated in common stop valve, and stationary seal has been stopped the possibility of leaking.During valve closing, spool moves downward, and spring tube elongates; During valve opening, the spring tube retraction.See accompanying drawing 1, Fig. 2.Fig. 1 is closed condition, and Fig. 2 is opening state.No matter spring tube is to open or closed condition is all pressed on the spool inner sleeve all the time, so spring tube can bear very high pressure and can not break, and for the vacuum valve that is used for vacuum system, then spring tube is inverted, and promptly during valve opening, spring tube is elongated; When vacuum valve cut out, the spring tube retraction was seen accompanying drawing 3, Fig. 4.Spring tube is outward a barometric pressure, is negative pressure in the valve, and spring tube also is to be close to all the time on the sleeve of spool and can not break.

Valve of the present invention only allows spring tube to elongate in the opening and closing process and shortens, and does not allow to produce to reverse, and therefore adopts the valve rod of rising stem (RS.) formula.The centre has a guide ring to limit valve rod to rotate.Also can adopt other structure to wait as the guiding keyway limits valve rod and rotates.Most critical element of the present invention: spring tube.Spring tube adopts folder high strength fibrous sheath in the rubber.Rubber is adopted good springiness, the intensity height, and the rubber of oil resistant and acid-alkali-corrosive-resisting can be selected different rubber with working medium according to the operating temperature of valve.Valve should not surpass 40% of spring tube length from standard-sized sheet to the stroke of closing, and promptly the elongation percentage of elastic rubber pipe is not more than 50%, and this elongation percentage is much smaller than the elongation percentage of breaking for the less rubber of general hardness.At the spring tube that is in for a long time under the extended state enough rebound degrees are arranged for allowing, spring tube should have certain length, and is unsuitable long, though long elongation percentage is little, but can increase the valve height.For guaranteeing that spring tube has enough tensile strengths and rebound degree, so accompany the fiber knitted cover of intensity height, good springiness in the spring tube.As knitting cover with nylon mousse processing.In another purpose of the high knitted fabric of folder good springiness intensity be when spring tube in drawing process because spring tube is to be close on the outer wall of inside race, it is long and influence spring-back force that the property bomb tube may produce local elongation.Excessive for preventing that spring tube from elongating inhomogeneous generation local elongation rate, the inner sleeve outer surface except that require highly polished, when assembling, valve should be coated with lubricating grease etc. between spring tube and the inner sleeve, or be lined with very little nylon of one deck frictional force or teflon etc. in the inner sleeve appearance, perhaps adopt metal with self-lubricating property.If valve working temperature height, when corrosivity was strong, the elastic force pipe can adopt silicone rubber or fluorosioloxane rubber, and the knitting cover of interior folder also can be selected for use high temperature resistant, and acid resistant alkali is high-strength, ageing-resistant special fibre processing, and present this high-performance fiber has been used for each field.Can under 250 ℃ of temperature, work for a long time.In folder high-intensity fiber stretch knit cover, can do the thickness of spring tube very thin, as it be thick to make the 2mm left and right sides, promptly behind coat with rubber slurry inside and outside the fabric sleeves again molded vulcanization form.

2. the interior leakage of valve:

The difference of another and common stop valve of the present invention is the sealing of spool and valve base chamber.The spool of traditional stop valve and the sealing of valve seat entirely by spool with the sealing surface of valve seat tight contact the after grinding and not revealing, promptly lean on the bright and clean smooth of sealing surface and have bigger pressure to seal, but existing stop valve leaks in being difficult in use for some time not produce, and promptly fits badly.Even the Acceptance criteria of new valve also is that the per minute leakage rate is no more than certain number that drips under hydrostatic test, also difficulty accomplishes that one does not leak.The present invention's sealing herein is to adopt the "O sealing, and the material of "O is a rubber, and a sealing surface fine finishing and need not grinding can guarantee that also valve closes back one tight and do not leak.For prevent that seal ring from coming off in groove, the width of rebate of seal ring should be littler than the diameter of ring, and during assembling, bottom land should be coated with one deck sealer (knockdown type), and the one, seal ring is sticked in the groove, also increased the reliability of sealing simultaneously.The sealing means of this kind spool has solved the interior leakage problem of valve.

Working pressure of the present invention :≤2.5MPa.

Material of the present invention, bore is installed Conncetion cimension and is all carried out Series Design by the standard of existing universal cutoff valves.According to the principle of spring tube sealing, in order to process and easy installation and removal, material-saving or structure be advantages of simple more, when doing the product line design, can improve structure.

Promote the use of for of the present invention, singly do not avoided because of the leakage of valve and fitted badly making the variety of issue that causes, also significantly reduced the workload that maintenance is saved from damage simultaneously.

Description of drawings

Fig. 1 is spring tube sealed stop valve a---closed condition.Among the figure: 1---valve body; 2---valve seat; 3---" O " seal ring; 4---spool; 5---the elastic packing pipe; 6---the inner tooth type floor clip; 7---cover in the spring tube; 8---valve rod; 9---the spring tube supporting ring; 10---" O " seal ring; 11---the spring tube gland; 12---guide ring; 13---valve gap; 14---lifting nut; 15---key; 16---flat nut; 17---handwheel; 18---bolt; 19---nut.

Fig. 2 is spring tube sealed stop valve a---opening state.

Fig. 3 is Dan Guan Mi envelope vacuum valve a---closed condition.Among the figure: 1---valve; 2---valve seat; 3---" O " RunddichtringO; 4---valve is drawn core; 5---the spring tube supporting ring; 6---" O ” Mi seal; 7---Dan Mi tube sealing; 8---the spring tube gland; 9---the spring tube pressure ring; 10---the inner tooth type floor clip; 11---valve gap; 12-to ring; 13---lifting nut; 14---valve rod; 15---handwheel; 16---key; 17---flat nut; 18---bolt; 19---nut.

Fig. 4 is spring tube sealed vacuum valve a---opening state.

Claims

1. the sealing at elastic tube seal valve valve rod place is not by filler, " O " type circle or " V " type circle seal, and seal by the high rubber elasticity pipe of good springiness, intensity of valve inside, spring tube one end is fixed on the valve body, one end is fixed on the spool, be the static seal state that is sealed at two ends, eliminated the possibility of valve leakage out of steam system.Can be replaced in general stop valve.During valve closing, spring tube is in extended state; During valve opening, spring tube is in retracted state.For the vacuum valve of the spring tube sealing that is used for negative pressure system, its inner spring tube is inverted; When being valve closing, the spring tube retraction; During valve opening, spring tube is in extended state.

2. spring tube and valve core, valve rod can only can not rotate as moving up and down, and does not produce distortion to guarantee spring tube when opening or closing.

3. spring tube adopts the high-intensity fiber fabric of the interior folder of the rubber good springiness of good springiness, according to the character and the operating temperature of material, can select different rubber for use.For high temperature (120 ℃) and strong corrosive medium, rubber can be selected silicone rubber or fluorosioloxane rubber for use, and that the fabric of interior folder can adopt is high temperature resistant, high strength, corrosion resistant special fibre.Rubber mainly seals in the spring tube, and it is to have higher intensity for spring tube under extended state that the spandex fabric of interior folder mainly acts on.

4. can on the spring tube inner sleeve, freely stretch during for the work of assurance spring tube (slip), except that the inner sleeve outer surface should have higher degree of finish, when valve assembles, should be coated with lubricating grease such as molybdenum disulfide etc. between spring tube internal surface and the sleeve, or interior cover surface serves as a contrast the little plastics of one deck frictional force or interior cover adopts the metal processing with self-lubricating property, to reduce friction.

5. spring tube should be made regular check on, and changes.

6. for solving the interior leakage problem of stop valve, the sealing of elastic tube seal valve spool between valve seat adopted has certain elasticity and hardness, and wear-resisting " O " type rubber seal ring, adopts the fluorosioloxane rubber material during high temperature, to improve the reliability of sealing.

7. for guarantee that " O " RunddichtringO can not come off in seal groove, need width of rebate is designed to be slightly less than seal diameter d, when assembling, coat caulking gum at bottom land seal ring is sticked in the groove simultaneously.

8. the design of rising stem (RS.) formula is adopted in design of the present invention.Material of the present invention, bore is installed Conncetion cimension and is all carried out Series Design by the relevant criterion of existing universal cutoff valves.According to sealing principle of the present invention, in order to process and easy installation and removal, material-saving or structure are more reasonable, when making the Series Design of product, can improve structure.