Dead-corner-free ultra-clean ball valve with self-cleaning function

Abstract

The invention provides a dead-corner-free ultra-clean ball valve with a self-cleaning function, and belongs to the technical field of ball valves.The dead-corner-free ultra-clean ball valve comprises a valve body, a valve rod and a ball body, the valve body comprises an inlet cavity, an outlet cavity and a middle cavity located between the inlet cavity and the outlet cavity, and the ball body is connected with the valve rod and rotationally arranged in the middle cavity; valve seats are arranged in the middle cavity and located on the two sides of the ball body, a cleaning diaphragm is arranged between the inner wall of the middle cavity and the outer wall of the ball body, the two ends of the cleaning diaphragm abut against the positions between the valve seats and the inner wall of the middle cavity, a sealing cavity is formed between the cleaning diaphragm and the inner wall of the middle cavity, and a channel communicated with the sealing cavity is formed in the valve body. And the channel is used for inflating or deflating the sealing cavity, so that the cleaning diaphragm deforms to clean the surface of the ball body. An active cleaning structure is formed by the cleaning diaphragm, the sealing cavity and the channel, the cleaning diaphragm can deform to wipe the surface of the ball body through inflation without disassembling the valve, attachments are rapidly removed, and production interruption and pollution risks caused by manual cleaning are avoided.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, and specifically to an ultra-clean ball valve with self-cleaning function and no dead angles. Background Technology

[0002] Ball valves are widely used in industries such as petrochemicals, long-distance pipelines, and chemicals, primarily for cutting off or connecting fluid passages in pipelines. With the continuous development of industrial technology, the application areas of ball valves are constantly expanding, especially in the semiconductor manufacturing field, where the performance requirements for ball valves are constantly increasing. Particularly in wafer processing and specialty gas transportation, ball valves need to strictly control the amount of metal ion deposition to meet the requirements of 3nm processes. In practical use, tiny impurities in the medium and wear particles from the sealing surface easily adhere to the ball's surface. Long-term accumulation can easily lead to secondary damage, increasing leakage rates and affecting the valve's service life.

[0003] Existing technologies also include some ball valves with cleaning functions. For example, patent CN218670730U discloses a filter ball valve, which uses a concave funnel-shaped inclined surface inside the valve ball and a connecting pipe at the midpoint. The bottom end of the connecting pipe is fitted with a collection box with a screen, allowing heavier particulate solids in the fluid to naturally and smoothly enter the collection box for storage. Another example is patent CN221743254U, which discloses a self-cleaning electric high-pressure ball valve, incorporating an ultrasonic cleaner and a self-cleaning mechanism for the spray pipe. Yet another example is patent C... Patent N109404557A discloses a flexible-sealed pulverized coal injection ball valve, which has through holes on both sides of the valve body. An external port of the through hole is connected to a vent valve, and an internal port is connected to a nozzle. High-pressure gas is injected through the nozzle to impact and remove accumulated ash from the valve cavity. Another example is patent CN215980929U, which discloses a pneumatic ball valve with a self-cleaning function, using a pneumatic actuator to drive brushes and nozzles for automatic cleaning. However, these cleaning structures either have limited cleaning effectiveness or are too complex, leading to high costs. As a result, most ball valves still require manual cleaning through periodic disassembly. Therefore, there is an urgent need to design a highly efficient and stable self-cleaning ball valve. Summary of the Invention

[0004] The purpose of this invention is to overcome the shortcomings and deficiencies of the existing technology and to provide a self-cleaning, ultra-clean ball valve with no dead angles.

[0005] The technical solution adopted by this invention is as follows: This application provides a self-cleaning, dead-angle-free ultra-clean ball valve, including a valve body, a valve stem, and a ball. The valve body includes an inlet chamber, an outlet chamber, and a central cavity located between the inlet chamber and the outlet chamber. The ball is connected to the valve stem and rotatably disposed in the central cavity. Valve seats are disposed on both sides of the ball within the central cavity. A cleaning diaphragm is disposed between the inner wall of the central cavity and the outer wall of the ball. The two ends of the cleaning diaphragm abut against the valve seat and the inner wall of the central cavity, forming a sealing cavity with the inner wall of the central cavity. A channel communicating with the sealing cavity is provided on the valve body. The channel is used to inflate or vent air into the sealing cavity, so that the cleaning diaphragm deforms and cleans the surface of the ball.

[0006] In some embodiments, annular grooves for mounting valve seats are formed on both sides of the central cavity, and the two ends of the cleaning diaphragm abut between the corresponding valve seat and the annular groove.

[0007] In some embodiments, the upper end of the valve body is connected to a valve cover, and it further includes an upper cavity located above and communicating with the middle cavity. The cleaning diaphragm includes a connecting cylinder portion and a flange portion located at the upper end of the connecting cylinder portion. A step portion is provided in the upper cavity. The flange portion abuts between the valve cover and the step portion. A self-lubricating bearing is provided between the connecting cylinder portion and the valve stem to form a rotatable connection.

[0008] In some embodiments, a sealing lip is provided on the inner side of the connecting cylinder below the self-lubricating bearing. The end of the sealing lip abuts against the outer wall of the valve stem. An air bladder is provided on the back of the sealing lip. A first air passage is provided on the valve body. One end of the first air passage is connected to the sealing cavity, and the other end is connected to the air bladder. A first one-way valve is provided in the first air passage, with the first one-way valve having a passage facing the air bladder. A second air passage is provided in the air bladder facing the ball. A second one-way valve is provided in the second air passage, with the second one-way valve having a passage facing the ball. When the sealing cavity is inflated to clean the ball, if the air pressure in the sealing cavity exceeds a first threshold, the first one-way valve opens, allowing gas to enter the air bladder. The air bladder expands, causing the sealing lip to press against the outer wall of the valve stem to form a reliable seal. When the air pressure in the air bladder reaches a second threshold, the second one-way valve opens, and gas is ejected from the second air passage to flush the surface of the ball.

[0009] In some embodiments, the second air passage is provided with an air pipe on the side near the valve stem, and the end of the air pipe near the valve stem is inclined downward.

[0010] In some embodiments, the inner wall of the upper cavity is provided with a first fixing groove, the connecting cylinder is provided with a first fixing ring that fits into the first fixing groove, and a second fixing groove and a second fixing ring are provided between the annular groove and the cleaning diaphragm to form a fitting and fixing.

[0011] In some embodiments, the sphere includes a first spherical surface and a second spherical surface, the second spherical surface being convex relative to the first spherical surface, and the second spherical surface being used to contact the sealing portion of the valve seat to form a seal.

[0012] In some embodiments, a hardened layer is provided on the sealing portion of the valve seat and the surface of the ball, and the hardened layer is generated by a composite hardening method of laser cladding Ni-WC and vapor deposition TiN.

[0013] In some embodiments, the top of the sphere is provided with a rectangular cross-section hole, which is connected to the central cavity. The lower end of the valve stem is connected to the rectangular cross-section hole. A stuffing box is provided between the valve stem and the valve cover. The stuffing box is provided with self-sealing packing, graphite packing and PTFE lip seal.

[0014] In some embodiments, a dynamic load spring is also included, and a pressure cap is bolted to the valve cover. Under the action of the dynamic load spring, the pressure cap presses the packing into the stuffing box.

[0015] The beneficial effects of the present invention are as follows: The present invention forms an active cleaning structure by means of a cleaning diaphragm, a sealing cavity, and a channel. Without disassembling the valve, the cleaning diaphragm can be deformed by inflation to wipe the surface of the ball, quickly removing the attached substances and avoiding the production interruption and pollution risks caused by manual cleaning. At the same time, the abutting structure at both ends of the cleaning diaphragm not only ensures the sealing performance of the sealing cavity, but also helps to fix the valve seat, improving the overall sealing performance and stability of the structure. Attached Figure Description

[0016] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, obtaining other drawings based on these drawings without creative effort still falls within the scope of the present invention.

[0017] Figure 1 This is a cross-sectional view of a self-cleaning, dead-angle-free ultra-clean ball valve according to the present invention; Figure 2 This is a partial cross-sectional view of an ultra-clean ball valve with self-cleaning function and no dead angle according to the present invention. Figure 1 ; Figure 3 This is a partial cross-sectional view of an ultra-clean ball valve with self-cleaning function and no dead angle according to the present invention. Figure 2 ; Figure 4 This is a partial cross-sectional view of an ultra-clean ball valve with self-cleaning function and no dead angle according to the present invention. Figure 3 ; Figure 5 This is a partial cross-sectional view of an ultra-clean ball valve with self-cleaning function and no dead angle according to the present invention. Figure 4 ; Figure 6 This is a partial exploded view of an ultra-clean ball valve with self-cleaning function and no dead angle according to the present invention; In the diagram: 1-Valve body, 100-Inlet cavity, 101-Outlet cavity, 102-Middle cavity, 1020-Annular groove, 103-Upper cavity, 1030-Stepped section, 1031-First fixing groove, 104-Second fixing groove, 105-Left valve body, 106-Right valve body, 2-Valve stem, 3-Spherical body, 30-Rectangular cross-section hole, 301-First spherical surface, 302-Second spherical surface, 4-Valve seat, 5- Cleaning diaphragm, 50-connecting cylinder, 500-sealing lip, 501-first retaining ring, 502-second retaining ring, 51-flange, 6-sealing cavity, 7-channel, 8-self-lubricating bearing, 9-air bladder, 10-first air passage, 1000-first check valve, 11-second air passage, 1100-second check valve, 1101-air pipe, 12-valve cover, 13-stuffing gland, 14-gland. Detailed Implementation

[0018] The following description provides specific application scenarios and requirements for this specification, intended to enable those skilled in the art to make and use the contents of this specification. Various partial modifications to the disclosed embodiments will be apparent to those skilled in the art, and the general principles defined herein can be applied to other embodiments and applications without departing from the spirit and scope of this specification. Therefore, this specification is not limited to the embodiments shown, but rather to the widest scope consistent with the claims.

[0019] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "longitudinal", "lateral", "radial", "length", "width", "thickness", "upper", "lower", "left", "right", "front", "rear", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are mainly for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element or component to have a specific orientation, or to be constructed and operated in a specific orientation.

[0020] It should be noted that the terms "first," "second," and similar words do not indicate any order, quantity, or importance, but are only used to distinguish different components and should not be construed as limiting the embodiments of this application.

[0021] It should be noted that the terms "installation," "setup," "equipped with," "connection," and "connected" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral structures; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium, or internal connections between two devices, components, or parts.

[0022] It should be noted that the terms "in some embodiments," "exemplarily," and "for example" are used to indicate examples, illustrations, or descriptions. Any embodiment or design described in this application as "in some embodiments," "exemplarily," or "for example" should not be construed as being more preferred or advantageous than other embodiments or designs. Specifically, the use of terms such as "in some embodiments," "exemplarily," and "for example" is intended to present related concepts in a specific manner, meaning that a particular feature, structure, or characteristic described in connection with an embodiment may be included in at least one embodiment of this application. The appearance of the above terms in various places in the specification does not necessarily refer to the same embodiment, nor is it a separate or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0023] Those skilled in the art can understand the specific meaning of the above terms in this application based on the specific circumstances.

[0024] Regarding the accompanying drawings of this application, it should be clearly understood that the drawings are for illustrative and descriptive purposes only and are not intended to limit the scope of this specification. It should also be understood that the drawings are not necessarily drawn to scale.

[0025] In practical applications, ball valves may accumulate small impurities in the medium, wear particles on the sealing surface, and the medium itself. Long-term accumulation can lead to increased torque, secondary damage, increased leakage rate, and reduced valve lifespan.

[0026] Based on the above issues, such as Figures 1 to 6 As shown, this application provides a self-cleaning, dead-angle-free ultra-clean ball valve, including a valve body 1, a valve stem 2, and a ball 3. The valve body 1 includes an inlet chamber 100, an outlet chamber 101, a middle cavity 102 located between the inlet chamber 100 and the outlet chamber 101, and an upper cavity 103 located above and connected to the middle cavity 102. The ball 3 is connected to the valve stem 2 and rotatably disposed in the middle cavity 102. The inlet chamber 100 and the outlet chamber 101 are used for the inflow and outflow of the medium, respectively, while the middle cavity 102 provides space for the rotation of the ball 3. The interconnected design of the three ensures that the medium can flow smoothly without any dead angles.

[0027] The ball 3 has a rectangular cross-section hole 30 at its top, which is connected to the central cavity 102. This design does not obstruct the flow of media or cause impurities to accumulate, meeting cleanroom design requirements. The lower end of the valve stem 2 is connected to the rectangular cross-section hole 30, ensuring that the rotation of the valve stem 2 can synchronously drive the ball 3 to accurately switch its on / off state. The upper end of the valve stem 2 is connected to the actuator.

[0028] In some embodiments, the spherical surface of the sphere 3 is a discontinuous spherical surface, which includes a first spherical surface 301 and a second spherical surface 302. The second spherical surface 302 protrudes relative to the first spherical surface 301 and is used to contact the sealing portion of the valve seat 4 to form a seal.

[0029] In addition, a hardening layer is provided on the sealing part of the valve seat 4 and the surface of the ball 3. The hardening layer is enhanced in hardness and wear resistance by laser cladding of Ni-WC, and then a smooth protective film is formed by vapor deposition of TiN to achieve self-polishing and corrosion resistance.

[0030] Preferably, after hardening, the sphere 3 has a hardness of 1600HV-2000HV, and the valve seat 4 has a hardness of 500HV-1800HV. The hardened layer has the characteristics of high bonding strength, high hardness, and good high temperature resistance.

[0031] Valve seats 4 are located on both sides of the ball 3 within the central cavity 102. Specifically, annular grooves 1020 are machined on both sides of the central cavity 102. The annular grooves 1020 provide precise installation positioning for the valve seats 4, preventing displacement of the valve seats 4 during the rotation of the ball 3. The sealing part of the valve seat 4 fits against the surface of the ball 3, ensuring the sealing performance when the valve is closed. Importantly, a cleaning diaphragm 5 is provided between the inner wall of the central cavity 102 and the outer wall of the ball 3. The cleaning diaphragm 5 and the inner wall of the central cavity 102 form a sealing cavity 6, which includes a connecting cylinder 50. The two ends of the cleaning diaphragm 5 abut against the valve seat 4 and the annular grooves 1020, further enhancing the sealing effect of the sealing cavity 6. At the same time, with the support of the valve seat 4, the cleaning diaphragm 5 is prevented from being excessively stretched and damaged during inflation deformation, extending the service life of the diaphragm. Moreover, the cleaning diaphragm 5 also enables the valve seat 4 to achieve elastic sealing.

[0032] The valve body 1 is provided with a channel 7 communicating with the sealing cavity 6. The channel 7 is used to fill or exhaust air into the sealing cavity 6, so that the cleaning diaphragm 5 deforms to clean the surface of the cleaning ball 3. Generally, a solenoid valve is installed at the channel 7 to control the air inlet and outlet, and then the solenoid valve is connected to a corresponding vacuum device.

[0033] With this configuration, when the surface of the sphere 3 needs cleaning, compressed gas is introduced into the sealed cavity 6 through the channel 7. The pressure inside the sealed cavity 6 increases, pushing the main body of the cleaning diaphragm 5 to deform towards the sphere 3. The inner surface of the diaphragm contacts and wipes the surface of the sphere 3, removing any adhering substances. After cleaning, the gas in the sealed cavity 6 is discharged through the channel 7, and the cleaning diaphragm 5 returns to its original position under its own elasticity and the pressure of the medium, without affecting the normal rotation of the sphere 3. Under normal conditions, the cleaning diaphragm 5 can be attached to the inner wall of the central cavity 102 to prevent it from being in a deformed state for a long time.

[0034] At the same time, it forms an active cleaning structure, which can quickly remove the adhering substances by inflating the diaphragm to wiping the surface of the ball 3 without disassembling the valve, thus avoiding the production interruption and pollution risks caused by manual cleaning. In addition, the abutting structure at both ends of the cleaning diaphragm 5 not only ensures the sealing performance of the sealing cavity 6, but also helps to fix the valve seat 4, improving the overall sealing performance and stability of the structure.

[0035] The outlet of channel 7 is equipped with a solenoid valve and can be connected to an external air source control device to realize the inflation and deflation operations of the sealed cavity 6.

[0036] Among them, the cleaning membrane 5 is made of a polymer material that is resistant to media and has good elasticity.

[0037] Furthermore, the inner wall of the annular groove 1020 is provided with connecting teeth to strengthen the connection between the cleaning diaphragm 5 and the valve body 1.

[0038] In some embodiments, the first spherical surface 301 is provided with a plurality of recesses. The recesses can reduce the overall weight of the ball 3 and reduce the driving load of the valve stem 2; at the same time, during the flow of the medium, the recesses can form micro eddies, which help to remove the micro deposits on the surface of the first spherical surface 301, and cooperate with the active cleaning of the cleaning diaphragm 5 to further improve the cleanliness of the surface of the ball 3, and the recess design will not create dead corners for medium retention.

[0039] In some embodiments, the valve body 1 includes a left valve body 105 and a right valve body 106. The inlet cavity 100 is disposed in the left valve body 105, and the outlet cavity 101 is disposed in the right valve body 106. The two are joined to form a middle cavity 102 and an upper cavity 103 disposed in the right valve body 106, and a sealing ring is provided at the connection. The upper ends of the two are connected to a valve cover 12. The cleaning diaphragm 5 includes a flange portion 51 at the upper end of the connecting cylinder portion 50. The flange portion 51 is annular and integrally formed with the connecting cylinder portion 50. An annular step portion 1030 is integrally formed on the inner peripheral wall of the upper cavity 103. The flange portion 51 abuts between the lower end face of the valve cover 12 and the upper end face of the step portion 1030. The axial fixation and radial sealing of the flange portion 51 are achieved by the clamping force of the valve cover 12, which not only enhances the overall sealing performance of the sealing cavity 6, but also provides a stable installation reference for the cleaning diaphragm 5, preventing axial movement during inflation deformation.

[0040] The connecting cylinder 50 is a cylindrical structure coaxially sleeved on the outside of the valve stem 2. A self-lubricating bearing 8 is provided between its inner wall and the valve stem 2 to form a low-friction rotational connection. The self-lubricating bearing 8 can effectively reduce the frictional resistance when the valve stem 2 rotates, while avoiding the generation of wear particles, which meets the requirements of ultra-clean design.

[0041] In some embodiments, the inner side of the connecting cylinder portion 50 is located below the self-lubricating bearing 8 and is integrally formed with an annular sealing lip 500. Its free end extends downward toward the valve stem 2 and elastically abuts against the outer wall of the valve stem 2, forming a basic rotary seal in the initial state, preventing the medium or impurities in the middle cavity 102 from penetrating toward the valve cover 12.

[0042] Furthermore, an air bladder 9 is provided on the side of the sealing lip 500 away from the valve stem 2. The air bladder 9 is embedded in an annular mounting groove machined on the inner wall of the connecting cylinder 50. Its material is high-pressure resistant elastic rubber, which has good extensibility and sealing performance. A first air passage 10 is machined inside the valve body 1. One end of the first air passage 10 is connected to the sealing cavity 6, and the other end extends to and is connected to the inner cavity of the air bladder 9. Specifically, the left valve body 105 and the right valve body 106 are respectively machined with the first air passage 10. The first air passage 10 is divided into two sections. The section of the air passage near the air bladder 9 is inclined. This division into two sections facilitates processing.

[0043] Through the above configuration, the air passage between the sealing cavity 6 and the airbag 9 is achieved. A first one-way valve 1000 is connected in series within the first air passage 10. The first one-way valve 1000 is directed towards the airbag 9, meaning that only gas from the sealing cavity 6 is allowed to flow towards the airbag 9, preventing gas from flowing back into the sealing cavity 6 and ensuring the pressure stability of the airbag 9. On the side of the airbag 9 facing the sphere 3, several second air passages 11 are uniformly machined circumferentially. One end of each second air passage 11 communicates with the inner cavity of the airbag 9, and the other end extends through the connecting cylinder 50 and faces the surface of the sphere 3. A second one-way valve 1100 is connected in series within each second air passage 11. The second one-way valve 1100 is directed towards the sphere 3, meaning that only gas from the airbag 9 is allowed to be ejected towards the sphere 3, preventing media or impurities from entering the airbag 9 in reverse. The first one-way valve 1000 and the second one-way valve 1100 refer to one-way valves with corresponding functions in the prior art and will not be described in detail here.

[0044] This structure is linked to the inflation / deflation function of the sealing cavity 6. When air is injected into the sealing cavity 6 through the channel 7 to clean the surface of the sphere 3, the air pressure inside the sealing cavity 6 gradually increases. When the air pressure exceeds the first threshold, the first one-way valve 1000 is opened, and part of the compressed gas in the sealing cavity 6 flows into the airbag 9 through the first air passage 10. The airbag 9 expands radially under the action of gas pressure, thereby generating uniform radial pressure on the back of the sealing lip 500, pushing the free end of the sealing lip 500 to press more tightly against the outer wall of the valve stem 2, forming a self-tightening rotary seal. The sealing effect is enhanced as the air pressure increases, effectively blocking the diffusion of impurities to the upper sealing area of ​​the valve stem 2 during the cleaning process. As gas is continuously injected, the air pressure inside the airbag 9 continues to rise. When the air pressure reaches the second threshold, the second one-way valve 1100 is opened, and the compressed gas inside the airbag 9 is quickly ejected through the second air passage 11, forming a high-pressure airflow that impacts the surface of the sphere 3. In this way, the cleaning diaphragm 5 can also be protected in case of over-inflation.

[0045] To improve the flushing effect, the second air passage 11 has several branch air pipes 1101 evenly arranged circumferentially on the side near the valve stem 2. The air pipes 1101 are integrally formed with the second air passage 11, and the end near the valve stem 2 is inclined downward at a 45° angle, so that the ejected high-pressure airflow can accurately cover the outer wall of the valve stem 2 to form an air curtain seal. That is, the inclined downward airflow direction can prevent impurities from being blown towards the sealing lip 500 or the self-lubricating bearing 8, reducing the risk of secondary pollution.

[0046] In some embodiments, the inner wall of the upper cavity 103 is provided with a first fixing groove 1031, and the connecting cylinder portion 50 is provided with a first fixing ring 501 that fits into the first fixing groove 1031. A second fixing groove 104 and a second fixing ring 502 are provided between the annular groove portion 1030 and the cleaning diaphragm 5 to form a fitted and fixed connection. During processing, the cleaning diaphragm 5 is directly formed inside the valve body 1, so that the fixing ring is directly embedded in the corresponding fixing groove. The cross-section of the fixing ring and the fixing groove can be a dovetail groove or a continuous tooth shape, etc. Through the double limiting of the first fixing ring 501 and the second fixing ring 502, it is ensured that the two ends of the cleaning diaphragm 5 are fixed, and the middle part can deform to clean the surface of the ball 3.

[0047] A stuffing box 13 is provided between the valve stem 2 and the valve cover 12. The stuffing box contains a self-sealing packing, graphite packing, and a PTFE lip seal. The valve cover 12 provides an installation carrier for the stuffing box 13 and facilitates the disassembly and maintenance of internal components. The self-sealing packing, graphite packing, and PTFE lip seal in the stuffing box 13 constitute a three-stage sealing structure. The self-sealing packing ensures a static seal, the graphite packing can automatically compensate for tiny gaps caused by wear or thermal expansion and contraction of the sealing surface, and the PTFE lip seal further enhances the sealing effect. At the same time, the chemical stability and low friction coefficient of PTFE can prevent contamination of the medium, making it suitable for high-cleanliness environments.

[0048] In some embodiments, a dynamic load spring is also included. A pressure cap 14 is bolted to the valve cover 12. Under the action of the dynamic load spring, the pressure cap 14 presses the packing into the stuffing box 13. The dynamic load spring can provide a continuous and uniform clamping force to the pressure cap 14, so that the packing is always tightly fitted into the stuffing box 13. It can automatically compensate for the wear of the packing and avoid sealing failure due to packing wear. The pressure cap 14 can also be replaced online for easy maintenance.

[0049] In summary, after reading this detailed disclosure, those skilled in the art will understand that the foregoing detailed disclosure is presented by way of example only and is not restrictive. Although not explicitly stated herein, those skilled in the art will understand that the requirements of this application encompass various reasonable changes, improvements, and modifications to the embodiments. These changes, improvements, and modifications are intended to be made by this application and are within the spirit and scope of the exemplary embodiments of this application.

[0050] Furthermore, it should be understood that in the foregoing description of the embodiments of this application, various features are combined in a single embodiment, drawing, or description for the purpose of simplifying the understanding of a feature. However, this does not mean that the combination of these features is necessary, and those skilled in the art may readily identify some of the devices as separate embodiments when reading this application. That is, the embodiments in this application can also be understood as an integration of multiple sub-embodiments. It is also valid when each sub-embodiment contains fewer than all the features of a single foregoing disclosed embodiment.

[0051] Finally, it should be understood that the embodiments disclosed herein are illustrative of the principles of the embodiments of this application. Other modified embodiments are also within the scope of this application. Therefore, the embodiments disclosed herein are merely examples and not limitations. Those skilled in the art can adopt alternative configurations to implement the applications in this application based on the embodiments in this application. Therefore, the embodiments of this application are not limited to the embodiments precisely described in the application.

Claims

1. A self-cleaning, dead-angle-free ultra-clean ball valve, comprising a valve body, a valve stem, and a ball, wherein the valve body includes an inlet chamber, an outlet chamber, and a central cavity located between the inlet chamber and the outlet chamber, the ball is connected to the valve stem and rotatably disposed in the central cavity, and valve seats are disposed on both sides of the ball within the central cavity, characterized in that, A cleaning diaphragm is provided between the inner wall of the cavity and the outer wall of the ball. The two ends of the cleaning diaphragm abut against the valve seat and the inner wall of the cavity, forming a sealed cavity with the inner wall of the cavity. The valve body is provided with a channel communicating with the sealed cavity. The channel is used to inflate or vent air into the sealed cavity, so that the cleaning diaphragm deforms to clean the surface of the ball.

2. The self-cleaning, dead-angle-free ultra-clean ball valve according to claim 1, characterized in that, The two sides of the central cavity are formed with annular grooves for mounting valve seats, and the two ends of the cleaning diaphragm abut between the corresponding valve seats and the annular grooves.

3. The self-cleaning, dead-angle-free ultra-clean ball valve according to claim 2, characterized in that, The valve body is connected to a valve cover at its upper end, and also includes an upper cavity located above and communicating with the middle cavity. The cleaning diaphragm includes a connecting cylinder portion and a flange portion located at the upper end of the connecting cylinder portion. A step portion is provided in the upper cavity. The flange portion abuts between the valve cover and the step portion. A self-lubricating bearing is provided between the connecting cylinder portion and the valve stem to form a rotatable connection.

4. The self-cleaning, dead-angle-free ultra-clean ball valve according to claim 3, characterized in that, A sealing lip is provided on the inner side of the connecting cylinder below the self-lubricating bearing. The end of the sealing lip abuts against the outer wall of the valve stem. An air bladder is provided on the back of the sealing lip. A first air passage is provided on the valve body. One end of the first air passage is connected to the sealing cavity, and the other end is connected to the air bladder. A first one-way valve is provided in the first air passage, with the first one-way valve facing the air bladder as a passage. A second air passage is provided in the air bladder facing the ball. A second one-way valve is provided in the second air passage, with the second one-way valve facing the ball as a passage. When the sealing cavity is inflated to clean the ball, the air pressure in the sealing cavity exceeds a first threshold, which opens the first one-way valve, allowing gas to enter the air bladder. The air bladder expands, causing the sealing lip to press against the outer wall of the valve stem to form a reliable seal. When the air pressure in the air bladder reaches a second threshold, the second one-way valve opens, and gas is ejected from the second air passage to flush the surface of the ball.

5. A self-cleaning, dead-angle-free ultra-clean ball valve according to claim 3, characterized in that, The second air passage is provided with an air pipe on the side near the valve stem, and the end of the air pipe near the valve stem is inclined downward.

6. A self-cleaning, dead-angle-free ultra-clean ball valve according to claim 3, characterized in that, The inner wall of the upper cavity is provided with a first fixing groove, the connecting cylinder is provided with a first fixing ring that fits into the first fixing groove, and a second fixing groove and a second fixing ring are provided between the annular groove and the cleaning membrane to form a fitting and fixing.

7. A self-cleaning, dead-angle-free ultra-clean ball valve according to claim 1, characterized in that, The sphere includes a first spherical surface and a second spherical surface, the second spherical surface being convex relative to the first spherical surface, and the second spherical surface being used to contact the sealing part of the valve seat to form a seal.

8. A self-cleaning, dead-angle-free ultra-clean ball valve according to claim 1, characterized in that, The sealing part of the valve seat and the surface of the ball are provided with a hardening layer, which is generated by a composite hardening method of laser cladding Ni-WC and vapor deposition TiN.

9. A self-cleaning, dead-angle-free ultra-clean ball valve according to claim 3, characterized in that, The top of the sphere is provided with a rectangular cross-section hole, which is connected to the central cavity. The lower end of the valve stem is connected to the rectangular cross-section hole. A stuffing box is provided between the valve stem and the valve cover. The stuffing box is provided with self-sealing packing, graphite packing and PTFE lip seal.

10. A self-cleaning, dead-angle-free ultra-clean ball valve according to claim 9, characterized in that, It also includes a dynamic load spring, and a pressure cap is bolted to the valve cover. Under the action of the dynamic load spring, the pressure cap presses the packing into the stuffing box.

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