CN101799080B - Double-ball rigid-flexible deformation seal valve - Google Patents

Abstract

Valves are equipped with seals and actuators for on-off, often with conical or spherical surfaces and packing seals, especially double-ball rigid-flexible deformation sealing valves. There are pipes in the valve body cavity, and there are two balls in the pipe. The ball and the pipe diameter form a joint. The rigid one and the soft one form an interference tight fit, and the soft one produces elastic deformation, embracing the spheres to form a dense seal. When the screw drives the spheres to move axially, one ball performs the opening and closing function, and the other ball permanently seals the operating part, so The two balls have achieved a breakthrough in high temperature and high pressure valves or other gas-liquid transmission with zero leakage. The valve body is covered with a pipe, and the external part is tightly fitted in double layers. There is a hole in the middle of the pipe that communicates with the valve cavity, and a ball is provided at each end to squeeze the pipe hole with interference, and an annular sealing ring is formed on the circumference of the contact line, which is reliable in sealing. Durable. The two spheres are interlocked with each other, pushed axially by the screw drive, forcing the pipe to partially expand into elastic deformation, where the outer diameter of the pipe is close to or contacts the aperture of the valve body, increasing the strength. In addition, the sealing surface is replaced with a new one, so the double-ball rigid-flexible deformation sealing valve is the most suitable product for various pressures, temperatures and harsh and dangerous environments.

Description

Double ball rigid-flexible deformation sealing valve

technical field

The opening and closing of the pipeline must have an opening and closing and execution operating device, and its closure is usually adjusted or cut off by the combination of two planes, conical cylinders or arc spheres or packing tightly. the

A double-ball rigid-flexible deformation sealing valve that combines rigidity and softness, squeezes and expands the softness with the interference size of the rigidity to form the elastic deformation of the softness, and realizes the tight integration of rigidity and softness to form a sealing surface. the

There is a pipe in the valve body, and there are two blocking bodies (such as spheres) in the pipe. The valve body and the external connection end of the pipe form a tight fit double-layer structure, and the remaining valve holes leave a small gap. The large cavity communicates with the long hole in the middle of the pipe, and the middle pipe The inner diameter is slightly larger than the ball diameter, and the blocking body (hereinafter collectively referred to as the sphere) can be opened and closed by axial displacement, but the end tube and the ball that perform the opening and closing operation form a permanent seal. the

Background technique

The gas-liquid dredging or closing of the pipeline is usually closed or opened by the sealing surface of the two with the same geometric shape and structural size. It is difficult to achieve multiple consistency of the two containment joint surfaces, so leakage is inevitable. Especially the control operating parts must be worn, corroded and damaged due to rotation or sliding, and external leakage even exists from the beginning. This kind of anti-seepage measures that must be from the outside to the inside of the action parts has not been perfected so far, especially the high-temperature and high-pressure transportation or the leakage of toxic and dangerous fluids will pollute the environment, reduce pressure, lose energy, and may cause accidents. Therefore, hidden dangers of structural insecurity must be technically excluded. the

Usually, the valve is opened or closed by rotation and relative clutch, the operation is laborious and time-consuming due to the large torque, and the control cost is high. In addition, due to the difference in the distance of the clutch, the rotation combination makes the pressing force inconsistent with the degree of deformation, the seal is uneven, and local leakage is prone to occur. the

Contents of the invention

A double-ball rigid-flexible deformation sealing valve that adopts rigid and flexible phase extrusion to form a tight seal and a permanent seal. With a proper amount of interference in the rigid part, the deformation force is generated by extruding the flexible part to make the two more combined. Dense, to achieve fluid on-off control without leakage. the

A pipe is installed in the valve body that meets the pressure, temperature and strength requirements. There are two balls in the pipe. The balls are connected to each other and can be displaced axially by the screw in the pipe. No matter whether the operation end pipe is opened or closed, the assembly is in a sealed state, so the two-ball seal achieves zero leakage. the

A valve body is T-shaped and has three external end faces, the first and second ends are inlet and outlet, the third end is equipped with operating parts, and the second and third are in a straight line. the

A pipeline is installed inside the valve, and its two ends are closely matched with the second and third joint ends of the valve body to form a double-layer channel, which is used for external installation. the

There is a sphere at the two ends of the inner diameter of the pipe and the diameter of the pipe to form one rigid and one soft, and they are squeezed by interference fit to form a rigid and flexible, resulting in local elastic deformation (that is, the contact circle of the ball tube), so the three external ends of the valve are two-position The sphere cuts off the passage, and when it is closed, it is not connected with each other, and when it is opened, the two bits are connected. the

High-temperature and high-pressure gas-liquid transportation commonly used metal thin-walled tubes (stainless steel tubes) and steel ball tubes are tightly fitted and sealed. The ball is rigid and the tube is flexible. The thickness of the tube wall is determined according to the size of the elastic deformation force, and even a thin film tube can be used. The pipe is used as a seal to be able to expand and deform when being squeezed by the steel ball, so that the local material forms a cohesive force on the steel ball. Except that the two ends of the pipe are closely matched with the valve body, an appropriate amount of gap is formed near the two ends due to the difference in the diameter of the valve body or the outer diameter of the pipe. The internal diameter effectively improves the strength and overall rigidity of the thin tube. the

There are many long slot holes in the middle of the pipe, which communicate with the valve cavity and an inlet and outlet. When the ball is moved axially by the helical drive of the screw, the ball that performs the on-off function gradually leaves the sealing section and moves to the long groove in the middle of the pipe. The inlet and outlet will be connected, that is, the conveying will be opened. However, the ball at the operating end is always tightly fitted and sealed with the inner diameter of the pipe throughout the entire stroke range, achieving a permanent seal and preventing leakage of the operating part. The inner diameter of the middle section of the pipe is slightly larger than the diameter of the ball, and the ball is not in contact with the pipe wall during displacement and has no wear. the

The structure of the valve body and the pipeline in a double-layer nest is a design that meets the strength requirements. Pipes and spheres are used as seals mainly to match the selection of interference and elastic deformation, and the deformation is controlled within the elastic range. Therefore, high-pressure valves should be made of highly elastic and tough metal materials. A large amount of interference can obtain a large bonding force, and the required axial thrust is also large. Therefore, the conical cylindrical or spherical shape can easily be used as a rigid part to force a large local elastic deformation of the flexible pipe with a small operating force to achieve high-pressure transmission control. Large-diameter valve seal size will inevitably increase when it is squeezed, and the design fit length should be appropriate, that is, long-term reciprocating extrusion can move the old joint to a new unworn sealing section when it is worn. the

The flexibility of rigid and flexible materials is selected according to the pressure of the conveying medium. The difference between the flexibility of the two materials, that is, the degree of deformation, depends on the amount of elastic deformation and the geometric shape of the sphere. Extra-high pressure valves can use conical cylindrical plugging bodies to form annular sealing bands. Regardless of whether the sealing ring is linear or belt-shaped, it should be partially and elastically deformed on the length of the pipeline. Using the ball and the pipe to form a contact circular ring belt sealing surface is not only easy to process, but also can carry out the initial running-in process, and the process of mechanical running-in can significantly improve the precision of the mating surface. the

The high-temperature and high-pressure metal seal uses rigidity and flexibility to open and close to save effort. The large ball is used for opening and closing sealing, while the diameter of the ball at the operating end can be smaller and the thrust is also small. The double-layer sleeve has strong strength, simplified structure, easy manufacture, and forced sealing to overcome leakage. It is widely used and has remarkable benefits. the

There is a tube inside the valve, and there are two balls in the tube to seal separately. There is a section of sealing surface in the axial length. After frequent movement and wear, you can change the position and still have a new unworn sealing surface to ensure long-term durability. the

The specific details and the best method for implementing the present invention will be described in detail below with reference to the accompanying drawings. the

Accompanying drawing 1 is the structural principle diagram of double-ball rigid-flexible deformation sealing valve. the

Accompanying drawing 2 is a kind of conical cylinder shape figure of various pipe blockages in the double ball rigid-flexible deformation sealing valve. the

Accompanying drawing 3 is the different-diameter pipe shape diagram of the double-ball rigid-flexible deformation sealing valve, and the diameters of the two balls can be quite different. the

Among Fig. 1, 1, valve body, 2, pipeline, 3, sphere, 4, connecting rod, 5, another sphere, 6, screw rod (or claim valve stem), 7, backing plate, 8, end cover, 9, Bearing, 10, nut and rotating connection. the

In the figure, the valve body 1 has a three-way external flange, which is sealed and combined with the conveying parts. The valve body orifice is tightly fitted with the pipe and has a cylindrical length. Cavity to deform and expand the pipe. There is a large valve cavity in the valve body, which forms a space with the pipeline, and the resistance of gas and liquid dredging is small. the

The 2nd, pipeline, metal material is made thin-walled, is convenient to elastic deformation, and wherein section has a plurality of long slotted holes to communicate with valve cavity, and inner diameter is slightly larger than ball diameter. 3 is the blocking body, which has a spherical shape or a drum shape combined with a conical cylinder. The two spheres are located at the two ends of the tube, and there is a connecting rod linkage. One ball is used for the opening and closing function of the channel, and the other ball is in the tube at the operating end of a screw. For a permanent seal to prevent leakage of the action parts. The two-position sphere and the pipe form a pair of one rigid and one soft. The diameter of the metal ball is slightly larger than the inner diameter of the pipe, forming a squeeze and tight fit, blocking the passage of gas and liquid. But the valve is opened when it is displaced to the long groove (at this moment, the ball is not in contact with the pipe wall), so as to achieve gas-liquid transportation. Although the wall thickness of the pipe is thin, the thin-walled pipe has high strength and can withstand high pressure because the outer diameter of the valve body is fitted, tightly fitted or expanded, and the outer diameter of the pipe is close to the valve hole. The ball 5 and the pipe diameter are always in a tight fit and sealed state, which is easy to achieve zero leakage at the operating end, so that the transmission parts such as screws, nuts and bearings are isolated from gas and liquid, and will not rust after long-term use after grease lubrication, and the opening and closing transmission is labor-saving and flexible. the

The inner diameter of the ball and the tube is the sealing surface and must slide axially, so the surface accuracy, roughness and wear resistance are better, and it will not be damaged after long-term use. Because the sphere and the round tube are the easiest to process, the cost is low and the precision is high, so this product adopts the circumferential sealing surface. the

6 is screw rod, has slip keyway, and nut 10 rotates during transmission, and screw rod 6 only moves axially. Since the ball has no direction, the contact with the pipe diameter in any direction is a circumferential ring line or belt, so the axial movement of the ball ensures the sealing combination and achieves multi-party consistency. the

7 is a backing plate, which bears the axial thrust of the bearing 9. The 8th, end cover holds concurrently. The nut 10 is pressure-bearing on both sides of the two bearings, and the rotation is labor-saving. Since the operating part is not communicated with the inner cavity, there is no gas and liquid leakage or corrosion, and parts are reduced. the

The contact seal needs to reach a certain compression force, that is, the pressure should be sufficient, and the larger the mating surface, the lower the pressure, so the large-area seal is not reliable. The present invention uses the local deformation of the ball and the tube to achieve high pressure, and at the same time, the contact surface is formed into a line or a strip with high precision and good closed compactness, which is a breakthrough in no leakage of the high-pressure valve. The rigid-flexible pairing of the present invention provides interference extrusion, elastic deformation, and two-ball sealing when applied to medium and low pressure valves. The tube and ball can also be made of non-metallic materials, which not only facilitates sealing, but also reduces operating force and manufacturing costs. the

The interference fit should use local deformation, and use sufficient thin-walled parts, even thin films, but these deformed parts with relatively small strength and rigidity should be supported by valve bodies with high strength and rigidity, that is, thin-walled or thin-walled parts. The thin-walled elastic deformable part can be durable if it is to be used as a double layer when it is sleeved with the valve body, which is the feature and contribution of the present invention. the

Accompanying drawing 2 is that the two-position blocking body in the pipeline adopts a conical cylinder combination. In the figure 3 and 5 are conical cylinders respectively arranged at two ends of the pipeline. , 5 is the connecting rod, and the two conical cylinders are axially displaced in the same direction at the same time. the

Attached Figure 3 shows that the large-diameter valve uses two spheres of different sizes. The large-diameter valve is equipped with a large ball for on-off control sealing, while the small-diameter valve is equipped with a small ball for the no-leakage seal at the operating end, so that the overall size is small. Practical and beautiful. the

The working principle of the above-mentioned plugging body is the same as that of the spherical body, and the width of the cylinder is selected according to the pressure and the thickness of the pipe wall. the

The sizes of the two spheres or the two conical cylinders can be different, and the corresponding pipe diameters also change accordingly, but there must be an interference tight fit. For ease of processing, the two balls of the small-diameter valve can be the same. The control operation section of the large-diameter valve and the ball should be selected with a smaller diameter according to the screw rod, which is easy to seal, reduces weight and operating force, and reduces costs. the

Claims (4)

1. double-ball rigid-flexible deformation seal valve; Have valve body (1), pipeline (2), two spheroids (3,5) and screw rod (6); The said pipeline of cavity inner sleeve (2) that it is characterized in that said valve body (1); Said two spheroids (3,5) are arranged in said pipeline (2) endoporus, and said spheroid (3,5) is arranged at the endoporus two end part of said pipeline (2) respectively, and the connecting rod interlock is arranged; Resiliently deformable during said pipeline (2) the hard to bear said spheroid of ability (3,5) extruding contains obvolvent and compresses said spheroid (3,5), forms the close-fitting sealing; Said pipeline (2) middle part internal diameter is bigger slightly than said spheroid (3,5) diameter; Do not contact with said pipeline (2) middle part when moving axially said spheroid (3,5) and do not have wearing and tearing; Said pipeline (2) sealed at both ends section internal diameter is but less than said spheroid (3,5) diameter, forms the interference close-fitting of the face that combines and seals; The middle part of said pipeline (2) has many slotted holes that the inner chamber of said valve body (1) is communicated with the endoporus of said pipeline (2); When the power screw that receive screw rod (6) when said spheroid (3,5) move axially; One of them spheroid (3) is made on-off function; Leave the seal section of said pipeline (2) gradually; Will make to import and export when moving on to slotted hole place, said pipeline (2) middle part to connect, and become the close-fitting sealing state with said pipeline (2) internal diameter all the time in the total travel scope at another spheroid (5) of the screw rod operating end of said pipeline (2).

2. double-ball rigid-flexible deformation seal valve according to claim 1; It is characterized in that said pipeline (2) is a thin-wall part; Two ends internal diameter and said spheroid (3,5) close-fitting; Said pipeline (2) is made the local external diameter of resiliently deformable and can be reached and draw close the corresponding hole wall of valve body (1), becomes double-deck valve body, improves pipeline strength.

3. double-ball rigid-flexible deformation seal valve according to claim 1 is characterized in that at the diameter of said another spheroid (5) of the screw rod operating end of said pipeline (2) diameter less than a said spheroid (3) of making on-off function.

4. double-ball rigid-flexible deformation seal valve according to claim 1 is characterized in that said two spheroids (3,5) respectively have one section sealing surface at axial length, can reach sealing at new station after the frequent old position wearing and tearing of using and guarantee durable for a long time.

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