High-sealing safety ball valve

Abstract

The invention relates to the technical field of ball valves, in particular to a high-sealing safety ball valve which comprises a valve body, a valve ball and a valve rod, the valve ball is arranged on the inner side of the valve body, the valve rod is installed on the surface of the valve body, and a cavity is formed between the valve body and the valve ball. A valve body opening channel is filled through deformation of the sealing ring, complete blocking of liquid materials is achieved, the inner ring face of the sealing ring deforms under the extrusion action of the guide ring, meanwhile, the deformation direction of the sealing ring is limited through the guide component and the fixing arc strip, it is guaranteed that the sealing ring covers the opening position of the valve body channel all the time, and the sealing effect is improved. The valve ball is separated from the inner cavity wall of the valve body by the cavity, so that friction between the valve ball and the inner cavity wall of the valve body is reduced, the valve ball is only in direct contact with the concave arc surface of the sealing ring, the sealing ring can freely deform, the amount of the buffer solution is kept unchanged all the time, and fluid media in a laboratory cannot enter when the ball valve is closed every time; therefore, the long-term stable sealing effect of the ball valve is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, in particular to a ball valve with high sealing safety. Background Art

[0002] A ball valve is a commonly used fluid control valve. Its core component is a sphere with a circular through hole. The on-off control of the fluid can be achieved by rotating the sphere. The ball valve has the advantages of simple structure, small size, light weight, small fluid resistance, reliable sealing performance and easy operation. It is suitable for a variety of media and working environments, and is widely used in various fields such as petroleum, chemical industry, water conservancy, electricity, municipal administration, etc. The ball valve is an indispensable and important component in the industrial pipeline system.

[0003] The ball valve mainly includes valve body, ball, valve seat, valve stem, sealing ring and other components. The sealing of the ball valve mainly depends on the close contact between the ball and the valve seat. When the valve is opened, the flow channel of the ball is completely aligned with the opening channel of the valve body to form a straight flow channel. The inner diameter of the sealing ring is larger than the inner diameter of the flow channel. Figure 2 When the valve is closed, the ball rotates to the closed position, and the smooth spherical surface of the ball fits tightly with the rubber ring on the valve seat to form a seal. Due to its excellent sealing properties, it can be used in laboratories and research facilities. Ball valves are often used to accurately control experimental conditions, such as adjusting fluid flow and pressure. However, these operations require frequent opening and closing of the ball valve to meet the needs of the experiment. In the case of frequent opening and closing, the sealing performance of the ball valve will deteriorate.

[0004] During the frequent opening and closing process, the ball and the rubber ring of the valve seat will constantly contact and separate, causing wear. This wear will gradually destroy the flatness and finish of the rubber ring, resulting in a decrease in sealing performance. The fluid medium in laboratories and research facilities will contain fine impurities or particles. Once the wear causes the fit between the sealing ring and the valve ball to decrease, these impurities will be stuck between the sealing surfaces when the ball valve is closed, preventing the ball valve from closing completely. The impurities will further wear the sealing surface, further deteriorating the sealing performance and making fluid leakage more likely to occur. This poses a safety risk to laboratories that require long-term stable operation.

[0005] Therefore, a ball valve with high sealing safety is proposed. Summary of the invention

[0006] The purpose of the present invention is to provide a ball valve with high sealing safety. In order to solve the problem that the sealing surface of the ball valve used in the laboratory is easily worn during frequent opening and closing, resulting in a decrease in sealing performance, prone to fluid leakage, and affecting laboratory safety, a guide ring and a guide component are used to limit the direction change of the sealing ring, and the deformation of the sealing ring and the pressure of the buffer solution are used to achieve stable sealing of the ball valve, thereby ensuring long-term stable operation of the ball valve.

[0007] To achieve the above object, the present invention provides the following technical solutions:

[0008] A high sealing safety ball valve, comprising a valve body, a valve ball and a valve stem, wherein the valve ball is arranged on the inner side of the valve body, the valve stem is mounted on the surface of the valve body, the end of the valve stem is in contact with the upper surface of the valve ball, a chamber is arranged between the valve body and the valve ball, both opening ends of the flow channel inside the valve ball are provided with sealing rings, the sealing rings are made of rubber, a guide groove is provided on the upper surface of the valve ball, a guide pin is mounted on the end of the valve stem, the guide pin is in contact with the guide groove, a guide ring is arranged on the inner ring surface of the sealing ring, the guide ring is fixedly connected with the flow channel opening of the valve ball, both side surfaces of the valve ball are provided with guide components, and the sealing ring and the guide component are both located in the chamber;

[0009] The valve ball moved by the valve stem rotates with its central axis to control the opening and closing of the valve. The guide ring is displaced on the inner ring surface of the sealing ring as the valve ball moves. The sealing ring, which is deformed due to the squeezing of the guide ring, partially covers the opening of the valve body channel, and the sealing ring blocks the flow path of the liquid.

[0010] It can be seen from the above scheme that the existing technology directly adopts a single-seat regulating valve, which has a simple structure and can accurately control the flow. However, this technical solution achieves high sealing safety of the ball valve through a unique design of sealing ring and guide ring. Compared with the existing technology, this solution reduces the wear of the sealing parts, ensures a long-term stable sealing effect, and improves the reliability and service life of the ball valve.

[0011] Preferably, the upper and lower surfaces of the sealing ring are both provided with fixed arc strips, and the side edges of the fixed arc strips are in contact with the inner cavity wall of the valve body.

[0012] It can be seen from the above scheme that the sealing performance of the ball valve in the prior art depends on the close fit between the spherical surface and the sealing ring. This design is prone to wear of the sealing ring and reduced sealing performance under frequent opening and closing. This technical scheme sets fixed arc strips on the upper and lower surfaces of the sealing ring. By connecting the fixed arc strips with the inner wall of the valve body, the main deformation direction of the sealing ring is limited, the wear between the sealing ring and the valve ball is reduced, and at the same time, it ensures that the deformation of the sealing ring always covers the opening of the valve body channel, achieving a long-term and stable sealing effect. Compared with the prior art, this scheme improves the sealing performance and durability of the ball valve and reduces maintenance costs.

[0013] Preferably, the sealing ring is an arc-shaped hollow structure, and a buffer is provided inside the sealing ring.

[0014] It can be seen from the above scheme that the sealing performance of the existing ball valve still depends on the elasticity of the rubber sealing ring, but frequent opening and closing will cause the sealing ring to wear and affect the sealing effect. In this technical scheme, the sealing ring is designed as an arc-shaped hollow structure and a buffer is built in. The hardness and softness of the sealing ring are adjusted by adjusting the concentration of the buffer to adapt to different working environments. Compared with the existing technology, this scheme not only improves the sealing performance of the ball valve, but also extends the service life of the sealing ring, reduces maintenance costs, and has significant beneficial effects.

[0015] Preferably, the convex arc surface of the guide component matches and fits with the inner wall surface of the valve body, the concave arc surface of the guide component is installed with a sliding bar, and the guide component is limitedly connected to the circumferential surface of the valve ball through the sliding bar.

[0016] It can be seen from the above scheme that the guide component of the ball valve in the prior art will adopt a simple sliding structure or a fixed connection. These methods are likely to cause wear between the guide component and the valve body or the valve ball when the ball valve is frequently opened and closed, affecting the sealing performance and the smoothness of opening and closing. In this technical scheme, the convex arc surface of the guide component matches and fits with the inner wall surface of the valve body, ensuring the stability and sealing of the guide component during the opening and closing process of the ball valve. At the same time, a sliding bar is installed on the concave arc surface of the guide component, and the sliding bar is connected to the circumferential surface of the valve ball through a limiting connection, which not only realizes the flexible connection between the guide component and the valve ball, but also limits their relative movement to prevent excessive wear. Compared with the prior art, this technical scheme improves the sealing performance and the smoothness of opening and closing of the ball valve, extends the service life of the guide component, and reduces maintenance costs.

[0017] Preferably, the concave arc surface of the guide ring is provided with a connecting ring, and the guide ring is connected to the opening end of the valve ball flow channel through the connecting ring.

[0018] It can be seen from the above scheme that in the prior art, the guide ring of the ball valve is directly installed on the opening end of the valve ball flow channel, or is fixed by means of threads, snaps, etc. These methods may cause the sealing performance to deteriorate due to wear or loosening after long-term use. In the present technical scheme, the concave arc surface of the guide ring is provided with a connecting ring, which is connected to the opening end of the valve ball flow channel through the connecting ring. This design not only improves the stability and sealing of the guide ring installation, but also enables the guide ring to maintain better stability and guidance during the opening and closing process of the valve ball. Compared with the prior art, the present technical scheme reduces the risk of reduced sealing performance due to loosening or wear of the guide ring, and improves the reliability and service life of the ball valve.

[0019] Preferably, a fixing ring is provided at the outer circumferential end of the guide ring, and the guide ring is connected to the inner ring surface of the sealing ring through the fixing ring.

[0020] It can be seen from the above scheme that in the prior art, the guide ring of the ball valve is fixed to the inner ring surface of the sealing ring by direct bonding, threaded connection or other mechanical fasteners. These methods have the problems of loose fixation, easy loosening or complex installation. In the present technical scheme, a fixing ring is provided at the outer circumferential end of the guide ring, and the fixing ring is connected to the inner ring surface of the sealing ring to achieve a stable installation of the guide ring. This design not only simplifies the installation process and improves the installation accuracy, but also ensures the stability and reliability of the guide ring in long-term use. Compared with the prior art, the present technical scheme improves the sealing performance of the ball valve, reduces the risk of sealing failure caused by loose guide ring or improper installation, and reduces the processing difficulty and cost.

[0021] Preferably, the convex arc surface of the sealing ring is provided with an inner slit area, a fixing area and an outer slit area from inside to outside, and the fixing area of ​​the convex arc surface of the sealing ring is connected to the inner cavity wall of the valve body.

[0022] It can be seen from the above scheme that the sealing ring of the ball valve in the prior art usually adopts an integral design. After long-term use, this design will cause the sealing performance to deteriorate due to the wear or deformation of the sealing ring. In this technical scheme, the convex arc surface of the sealing ring is cleverly provided with an inner slit area, a fixing area and an outer slit area from the inside to the outside. The fixing area is connected to the inner cavity wall of the valve body, thereby realizing the stable installation of the sealing ring. This design allows the sealing ring to adapt to the tiny gap between the valve body and the valve ball through the elastic deformation of the inner slit area and the outer slit area when it is under pressure, thereby improving the sealing performance. At the same time, the setting of the fixing area ensures the close connection between the sealing ring and the inner cavity wall of the valve body, preventing the sealing ring from falling off or shifting. Compared with the prior art, this technical scheme not only improves the sealing performance of the sealing ring, but also extends the service life of the sealing ring, reduces the frequency of maintenance and replacement, and reduces the cost of use.

[0023] Preferably, the sealing ring matches the chamber, the thickness of the guide ring is smaller than that of the sealing ring, and the outer diameter width of the guide ring is larger than the inner diameter width of the sealing ring.

[0024] It can be seen from the above scheme that: in the prior art, the sealing ring and guide ring of the ball valve often adopt a relatively simple structural design, which makes it difficult to achieve a good balance between sealing performance, wear resistance and service life. In view of this problem, this technical scheme optimizes the design of the structure of the sealing ring and the guide ring. The sealing ring matches the chamber to ensure the stability and sealing of the sealing ring during the opening and closing process of the ball valve. At the same time, the thickness of the guide ring is smaller than that of the sealing ring, but the outer diameter is wider than the inner diameter of the sealing ring. This design enables the guide ring to better guide the movement of the valve ball without increasing too much resistance, and effectively prevent excessive wear of the sealing ring. This design not only ensures the sealing performance of the ball valve, but also improves the wear resistance and service life of the sealing ring and the guide ring. Compared with the prior art, this technical scheme improves the sealing, wear resistance and service life of the ball valve while maintaining the simplicity of structure and cost economy.

[0025] Preferably, the valve ball is movably fitted with the concave arc surface of the sealing ring.

[0026] It can be seen from the above scheme that in the prior art, the sealing ring of the ball valve may be fixedly installed to form a static seal with the valve ball. When this method is used for a long time or is subjected to large pressure fluctuations, there will be a problem of loose fit between the sealing ring and the valve ball, resulting in medium leakage. In the present technical scheme, the sealing ring is designed as a concave arc surface, which fits the movement of the valve ball. This design allows the sealing ring to dynamically adjust the fitting state as the valve ball rotates during the opening and closing process of the valve ball, and always maintain close contact with the surface of the valve ball. This method effectively improves the sealing performance of the ball valve and reduces the risk of medium leakage. Compared with the prior art, the present technical scheme not only improves the sealing effect, but also reduces the wear of the sealing ring and extends the service life of the sealing ring by reducing the relative movement between the sealing ring and the valve ball.

[0027] Preferably, the guide component is an arc-shaped structure, and arc surfaces are provided on both side ends of the guide component, and the two guide components are located between two sealing rings.

[0028] It can be seen from the above scheme that the guide component of the ball valve in the prior art adopts a simple linear structure. This design will produce greater friction with the valve body or valve ball during the opening and closing process of the ball valve, affecting the smoothness and sealing of the opening and closing. The present technical scheme adopts a guide component with an arc structure, and both side ends thereof are provided with arc surfaces. This design enables the guide component to better fit with the inner wall of the valve body and the valve ball, reducing friction and wear during the opening and closing process. At the same time, the two guide components are located between the two sealing rings, which play a good supporting and guiding role, further improving the sealing and opening and closing stability of the ball valve. Compared with the prior art, the present technical scheme not only improves the sealing and opening and closing smoothness of the ball valve, but also simplifies the structure and reduces costs.

[0029] Compared with the prior art, the present invention has the following beneficial effects:

[0030] 1. A ball valve with high sealing safety. When the ball valve is opened, the flow channel of the valve ball is aligned with the opening channel of the valve body. The inner diameters of the sealing ring and the guide ring are larger than the inner diameter of the flow channel. The valve still has a small resistance and a straight flow channel, and the fluid flows smoothly. When the ball valve is closed, the deformation of the sealing ring fills the opening channel of the valve body to achieve complete blocking of the liquid. The inner ring surface of the sealing ring is deformed under the extrusion of the guide ring. At the same time, the guide component and the fixed arc strip limit the deformation direction of the sealing ring, ensuring that the sealing ring always covers the opening position of the valve body channel, effectively improving the long-term stability and reliability of the seal.

[0031] 2. A high sealing safety ball valve, in which the valve ball and the inner wall of the valve body are separated by a chamber, and there is no hard friction inside the valve body. At the same time, the valve ball is in direct contact with the concave arc surface of the sealing ring only, and the sealing ring can deform freely. Even under frequent opening and closing, the inner arc surface of the sealing ring is relatively less worn, thereby extending the service life of the ball valve.

[0032] 3. A high sealing safety ball valve, the convex arc surface of the sealing ring repeatedly fills the inner side of the opening channel of the valve body, and its sealing depends on the flow pressure of the buffer solution. Since the amount of buffer solution remains unchanged, the deformation of the sealing ring remains stable each time the ball valve is closed, the sealing surface will not be damaged, and the fluid medium in the laboratory will not enter, thus ensuring the long-term stable sealing effect of the ball valve and ensuring the safety of the laboratory. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0034] Figure 2 It is a schematic diagram of the prior art plan structure of the present invention;

[0035] Figure 3 It is a schematic diagram of the local structure of the present invention;

[0036] Figure 4 This is a schematic diagram of the assembly structure of the valve ball and the sealing ring of the present invention;

[0037] Figure 5 This is a schematic diagram of the planar structure of the present invention in an open state;

[0038] Figure 6 For the present invention Figure 5 A magnified schematic diagram of point A;

[0039] Figure 7 It is a schematic diagram of the closed state structure of the present invention without a guide component;

[0040] Figure 8It is a schematic diagram of the closed state planar structure of the present invention;

[0041] Fig. 9 It is a schematic plan view of the sealing ring of the present invention.

[0042] In the figure: 1. valve body; 2. valve ball; 3. valve stem; 4. sealing ring; 41. buffer; 42. outer slit area; 43. fixing area; 44. inner slit area; 5. guide pin; 6. guide groove; 7. fixed arc strip; 8. guide ring; 81. fixing ring; 82. connecting ring; 9. guide component; 91. sliding strip; 10. chamber. DETAILED DESCRIPTION

[0043] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0044] See also Figures 1 to 8 The present invention provides a high sealing safety ball valve, and the technical solution is as follows:

[0045] A high sealing safety ball valve comprises a valve body 1, a valve ball 2 and a valve stem 3, wherein the valve ball 2 is arranged on the inner side of the valve body 1, the valve stem 3 is installed on the surface of the valve body 1, the end of the valve stem 3 is connected with the upper surface of the valve ball 2, a chamber 10 is arranged between the valve body 1 and the valve ball 2, both opening ends of the flow channel inside the valve ball 2 are provided with sealing rings 4, the sealing ring 4 is made of rubber, a guide groove 6 is opened on the upper surface of the valve ball 2, a guide pin 5 is installed on the end of the valve stem 3, the guide pin 5 is connected with the guide groove 6, a guide ring 8 is arranged on the inner ring surface of the sealing ring 4, the guide ring 8 is fixedly connected with the flow channel opening of the valve ball 2, both side surfaces of the valve ball 2 are provided with guide components 9, and the sealing ring 4 and the guide component 9 are both located in the chamber 10;

[0046] The valve ball 2 moved by the valve stem 3 rotates about its central axis to control the opening and closing of the valve. The guide ring 8 moves on the inner ring surface of the sealing ring 4 as the valve ball 2 moves. The sealing ring 4, which is squeezed and deformed by the guide ring 8, partially covers the opening of the valve body 1 channel, and the sealing ring 4 blocks the flow path of the liquid.

[0047] In this embodiment, compared with the prior art, reference Figure 2When the valve ball 2 rotates to a specific position, the hole on it will be aligned or staggered with the channel of the valve body 1, thereby realizing the flow and disconnection of the fluid. A sealing ring is fixedly installed at the opening position of the channel of the valve body 1. When the hole of the valve ball 2 is staggered with the channel of the valve body 1, the sealing is completed by the close fit between the smooth spherical surface of the valve ball 2 and the sealing ring. However, in order to control the experimental process, the sealing ring will be worn many times under the frequent opening and closing of the ball valve. It is difficult for the spherical surface and the sealing ring to fit tightly for a long time, and the sealing effect gradually weakens. In order to solve this problem, the structure of the sealing ring is changed, and the "sealing is completed by the fit between the spherical surface and the sealing ring" is replaced by "the sealing ring 4 closes the opening channel of the valve body 1 to complete the sealing", which reduces the wear between the sealing ring 4 and the valve ball 2, and does not affect the closed sealing effect between the sealing ring 4 and the valve body 1, ensuring the long-term stability and reliability of the ball valve.

[0048] As an embodiment of the present invention, refer to Figure 1 , Figure 3 as well as Figure 4 The upper and lower surfaces of the sealing ring 4 are both provided with fixed arc strips 7, and the side edges of the fixed arc strips 7 are in contact with the inner cavity wall of the valve body 1.

[0049] In this embodiment, the main deformation direction of the sealing ring 4 is limited by fixing the arc strip 7 to ensure that the stretching space is fully utilized during the rotation of the valve ball 2 .

[0050] As an embodiment of the present invention, refer to Figure 4 and Figure 5 The sealing ring 4 is an arc-shaped hollow structure, and a buffer 41 is arranged inside the sealing ring 4 .

[0051] In this embodiment, a buffer 41 is installed inside the sealing ring 4. The sealing ring 4 is stronger when subjected to pressure or tension and is not easy to break or damage. At the same time, the buffer 41 can improve the wear resistance of the rubber bag and extend its service life. By adding buffers 41 of different types and proportions, the hardness and softness of the sealing ring 4 can be adjusted. The sealing ring 4 can maintain appropriate softness and elasticity to facilitate the tensile deformation activity of the sealing ring 4, and can also maintain a relatively high hardness and supporting force to stably fill the opening position of the valve body 1 channel.

[0052] As an embodiment of the present invention, refer to Figure 5 The convex arc surface of the guide component 9 matches and fits with the inner wall surface of the valve body 1, and the concave arc surface of the guide component 9 is installed with a sliding bar 91, and the guide component 9 is limitedly connected with the circumferential surface of the valve ball 2 through the sliding bar 91.

[0053] In this embodiment, when the sealing ring 4 undergoes tensile deformation, in order to ensure that a part of the sealing ring 4 can completely cover the opening position of the valve body 1 channel, the displacement of the guide component 9 is used to limit the deformation direction of the sealing ring 4 again, that is, the deformation direction of the sealing ring 4 is mainly the rotation direction of the valve ball 2, and the displacement area of ​​the guide component 9 is limited by the sliding bar 91.

[0054] As an embodiment of the present invention, refer to Figure 5 The concave arc surface of the guide ring 8 is provided with a connecting ring 82, and the guide ring 8 is fixedly connected to the opening end of the flow channel of the valve ball 2 through the connecting ring 82.

[0055] In this embodiment, the connecting ring 82 can ensure that the two guide rings 8 synchronize the rotation of the valve ball 2 so as to give full play to the compression or tension effect of the guide rings 8 on the sealing ring 4 .

[0056] As an embodiment of the present invention, refer to Figure 6 A fixing ring 81 is provided at the outer circumferential end of the guide ring 8 , and the guide ring 8 is fixedly connected to the inner ring surface of the sealing ring 4 through the fixing ring 81 .

[0057] In this embodiment, the outer ring surface of the guide ring 8 is always fixedly connected to the inner ring surface of the sealing ring 4. When the guide ring 8 is displaced, one side of the sealing ring 4 will be deformed by the tensile action of the sealing ring 4, and the other side of the sealing ring 4 will be deformed by the compression action of the sealing ring 4. At this time, the buffer 41 will also adjust its position synchronously.

[0058] As an embodiment of the present invention, refer to Figure 5 and Fig. 9 The convex arc surface of the sealing ring 4 is provided with an inner slit area 44 , a fixing area 43 and an outer slit area 42 from inside to outside, and the fixing area 43 of the convex arc surface of the sealing ring 4 is in contact with the inner cavity wall of the valve body 1 .

[0059] In this embodiment, in order to ensure that the sealing ring 4 has sufficient deformation space, the convex arc surface of the sealing ring 4 is divided into three parts. The sealing ring 4 is fixed to the inner cavity wall of the valve body 1 only through the fixing area 43 to control the sealing ring 4 to always be in the channel opening area of ​​the valve body 1, and the outer slit area 42 and the inner slit area 44 provide sufficient reserved space during the deformation process of the sealing ring 4.

[0060] As an embodiment of the present invention, refer to Figure 5 and Figure 7 The sealing ring 4 matches the chamber 10 , the thickness of the guide ring 8 is smaller than that of the sealing ring 4 , and the outer diameter of the guide ring 8 is larger than the inner diameter of the sealing ring 4 .

[0061] In this embodiment, when the outer ring surface of the guide ring 8 squeezes the inner ring surface of the sealing ring 4, the extrusion surface can smoothly undergo double-layer folding, thereby preventing the sealing ring 4 from having large-area accumulation of wrinkles and causing the buffer solution 41 to flow poorly. No matter how the sealing ring 4 is deformed, the flow of the buffer solution 41 inside the sealing ring 4 always remains smooth.

[0062] As an embodiment of the present invention, refer to Figure 5 and Figure 7 The valve ball 2 and the concave arc surface of the sealing ring 4 are movably fitted.

[0063] In this embodiment, the valve ball 2 and the sealing ring 4 are movably fitted together. When the sealing ring 4 is deformed and displaced, the sealing ring 4 always fits the spherical surface of the valve ball 2 , and the spherical surface of the valve ball 2 also exerts a limiting compression effect on the sealing ring 4 .

[0064] As an embodiment of the present invention, refer to Figure 4 and Figure 5 The guide component 9 is an arc-shaped structure, and arc surfaces are provided on both side ends of the guide component 9 . The two guide components 9 are located between the two sealing rings 4 .

[0065] In this embodiment, the size of the guide component 9 matches the chamber 10, and the displacement of the guide component 9 controls the deformation space of the sealing ring 4, so that the sealing ring 4 has to extend to the channel opening position of the valve body 1, ensuring that the sealing ring 4 completes the channel sealing and closure of the valve body 1 each time.

[0066] Working principle: The valve stem 3 is used to move the valve ball 2 to rotate around its central axis to control the opening and closing of the valve. When the valve ball 2 rotates, the guide ring 8 at the opening end of its flow channel is displaced on the inner ring surface of the sealing ring 4. The deformation direction of the sealing ring 4 is limited by the guide component 9 and the fixed arc strip 7 to ensure that the displacement area of ​​the sealing ring 4 is always at the opening position of the valve body 1 channel, squeezing the sealing ring 4 to make it partially deformed and cover the opening of the valve body 1 channel, thereby blocking the liquid flow path to complete the sealing and achieve a long-term and stable sealing effect.

[0067] Specifically, in order to solve the problem of poor sealing of the ball valve used in the laboratory, the deformation of the sealing ring 4 fills the opening channel of the valve body 1 to completely block the liquid material. The operation is as follows:

[0068] When the ball valve needs to be closed, the experimenter moves the valve stem 3, and using the connection between the guide pin 5 and the guide groove 6, the valve ball 2 rotates synchronously in the inner cavity of the valve body 1, the guide ring 8 rotates synchronously, the guide ring 8 is staggered with the opening channel of the valve body 1, and the inner ring surface of the sealing ring 4 is subjected to the extrusion force from the outer ring surface of the guide ring 8. In the initial state, the inner ring surface of the sealing ring 4 is in a ring-shaped concave state due to the guide ring 8. Due to the displacement of the guide ring 8 on the inner side of the chamber 10, one side of the inner ring surface of the sealing ring 4 is continuously squeezed by the guide ring 8, and the degree of concave gradually deepens. The other side of the inner ring surface of the sealing ring 4 is continuously stretched due to the fixation of the fixing ring 81. Not only the concave disappears, but the ring width at this position is enlarged, and the buffer 41 gathers here. Figure 7 ( Figure 7 It is used to illustrate the deformation state of the sealing ring 4 in the state without the guide component 9, and the opening channels on both sides of the valve body 1 can be completely covered by the sealing ring 4;

[0069] Reference Figure 4 and Figure 8 When the concave side of the inner ring surface of the sealing ring 4 is completely overlapped, the guide ring 8 will squeeze and push the guide component 9 through the sealing ring 4, and the pushed guide component 9 will squeeze the non-concave outer ring surface of the other side of the sealing ring 4. At this time, the two fixed arc bars 7 are used to prevent the deformation direction of the sealing ring 4, and the deformation area of ​​the sealing ring 4 is limited to the opening channel position of the valve body 1. Due to the squeezing effect of the guide component 9, the activity space of the sealing ring 4 is compressed again. Under the flow pressure of the buffer solution 41, the sealing ring 4 expands and fills the inner side of the opening channel of the valve body 1. The buffer solution 41 fits tightly with the inner wall of the opening of the valve body 1, and the channel of the liquid material is completely blocked.

[0070] In order to maintain the long-term stable sealing effect of the sealing ring 4 on the ball valve, firstly, the valve ball 2 is separated from the inner cavity wall of the valve body 1 by a chamber 10, and will not directly contact, and the valve ball 2 under frequent opening and closing will not rub against the inner cavity wall of the valve body 1; secondly, the valve ball 2 is only in direct contact with the concave arc surface of the sealing ring 4, and the sealing ring 4 is movably connected with the valve ball 2, and the sealing ring 4 can deform freely. Even under the frequent opening and closing of the ball valve, the inner arc surface of the sealing ring 4 is relatively less worn, and will not affect the contact between the convex arc surface of the sealing ring 4 and the opening channel of the valve body 1; finally, under the frequent opening and closing of the ball valve, the convex arc surface of the sealing ring 4 repeatedly fills the inner side of the opening channel of the valve body 1, and the sealing of the sealing ring 4 and the opening channel of the valve body 1 depends on the flow pressure of the buffer solution 41, and the liquid volume of the buffer solution 41 always remains unchanged, that is, each time the ball valve is closed, the deformation of the sealing ring 4 remains stable, the sealing surface will not be damaged, and the fluid medium in the laboratory will not enter, so that the ball valve can maintain a long-term stable sealing effect, and the safety of the laboratory can be guaranteed.

[0071] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A high sealing safety ball valve, comprising a valve body (1), a valve ball (2) and a valve stem (3), wherein the valve ball (2) is arranged on the inner side of the valve body (1), the valve stem (3) is mounted on the surface of the valve body (1), and the end of the valve stem (3) is in contact with the upper surface of the valve ball (2), characterized in that: A chamber (10) is provided between the valve body (1) and the valve ball (2), and sealing rings (4) are provided at both open ends of the flow channel inside the valve ball (2), and the sealing rings (4) are made of rubber. A guide groove (6) is provided on the upper surface of the valve ball (2), and a guide pin (5) is installed at the end of the valve stem (3), and the guide pin (5) and the guide groove (6) are connected to each other. A guide ring (8) is provided on the inner ring surface of the sealing ring (4), and the guide ring (8) is fixedly connected to the flow channel opening of the valve ball (2). Guide components (9) are provided on both side surfaces of the valve ball (2), and the sealing ring (4) and the guide component (9) are both located in the chamber (10); The valve ball (2) moved by the valve stem (3) rotates about its central axis to control the opening and closing of the valve, and the guide ring (8) moves on the inner ring surface of the sealing ring (4) as the valve ball (2) moves. The sealing ring (4) is partially covered and filled with the opening of the valve body (1) channel due to the compression of the guide ring (8).

2. A high sealing safety ball valve according to claim 1, characterized in that: The upper and lower surfaces of the sealing ring (4) are both provided with fixed arc strips (7), and the side edges of the fixed arc strips (7) are in contact with the inner cavity wall of the valve body (1).

3. A high sealing safety ball valve according to claim 1, characterized in that: The sealing ring (4) is an arc-shaped hollow structure, and a buffer (41) is arranged inside the sealing ring (4).

4. A high sealing safety ball valve according to claim 1, characterized in that: The convex arc surface of the guide component (9) matches and fits with the inner wall surface of the valve body (1), and the concave arc surface of the guide component (9) is installed with a sliding bar (91). The guide component (9) is connected to the circumferential surface of the valve ball (2) in a limiting manner through the sliding bar (91).

5. A high sealing safety ball valve according to claim 1, characterized in that: The concave arc surface of the guide ring (8) is provided with a connecting ring (82), and the guide ring (8) is connected to the open end of the flow channel of the valve ball (2) through the connecting ring (82).

6. A high sealing safety ball valve according to claim 5, characterized in that: A fixing ring (81) is provided at the outer circumferential end of the guide ring (8), and the guide ring (8) is connected to the inner ring surface of the sealing ring (4) through the fixing ring (81).

7. A high sealing safety ball valve according to claim 1, characterized in that: The convex arc surface of the sealing ring (4) is provided with an inner slit area (44), a fixing area (43) and an outer slit area (42) from the inside to the outside, and the fixing area (43) of the convex arc surface of the sealing ring (4) is in contact with the inner cavity wall of the valve body (1).

8. A high sealing safety ball valve according to claim 6, characterized in that: The sealing ring (4) matches the chamber (10), the thickness of the guide ring (8) is smaller than that of the sealing ring (4), and the outer diameter of the guide ring (8) is greater than the inner diameter of the sealing ring (4).

9. A high sealing safety ball valve according to claim 1, characterized in that: The valve ball (2) is movably fitted with the concave arc surface of the sealing ring (4).

10. A high sealing safety ball valve according to claim 4, characterized in that: The guide component (9) is an arc-shaped structure, and arc surfaces are provided on both side ends of the guide component (9). The two guide components (9) are located between the two sealing rings (4).

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