A self-cleaning high-pressure sealed ball valve

Abstract

The present invention discloses a self-cleaning high-pressure sealed ball valve, which comprises a valve body, a closing member and a valve stem. The closing member is composed of a first hemispherical closing member and a second hemispherical closing member. Both hemispherical closing members have two degrees of freedom. The first degree of freedom is that the first hemispherical closing member and the second hemispherical closing member rotate around the valve stem axis as a whole to achieve the opening and closing of the valve. The second degree of freedom is that the first hemispherical closing member and the second hemispherical closing member respectively move transversely along their own axes to adjust the pressing force of the sealing pair. The present invention can automatically clean the scale at the contact part of the sealed valve. An external acting force can act on the sealing pair, and the pre-pressing force of the sealing pair can be adjusted through the torque of the opening and closing driving device, which is convenient to control. When the closing member is slightly worn and consumed, it can be compensated by the advancing distance of the closing member, so as to meet the requirements of high-pressure sealing and extend the service life of the ball valve.

Description

Technical Field

[0001] The present invention relates to the technical field of valves, and more particularly to a self-cleaning high-pressure sealed ball valve. Background Art

[0002] The opening and closing member of an existing ball valve is a sphere with a circular passage, which rotates around an axis perpendicular to the passage. The sphere rotates with the valve stem to achieve the purpose of opening and closing the passage. The ball valve only needs to rotate 90 degrees and has a very small rotational torque to close tightly. According to the working conditions, different driving devices can be assembled to form ball valves with various control methods, such as electric ball valves, pneumatic ball valves, hydraulic ball valves, etc.

[0003] Ball valves can generally be divided into three categories according to their structural forms: floating ball valves, fixed ball valves, and elastic ball valves. Among them, the sphere of the floating ball valve is floating. Under the action of the medium pressure, the sphere can produce a certain displacement and tightly press on the sealing surface at the outlet end to ensure the sealing at the outlet end; the sphere of the fixed ball valve is fixed and does not move under pressure. Fixed ball valves are all equipped with floating valve seats. After being subjected to the medium pressure, the valve seat moves, causing the sealing ring to tightly press on the sphere to ensure sealing.

[0004] The pressing force of the sealing pairs of the above floating ball and fixed ball ball valves comes from the working medium, and the sealing degree is dynamic. When the medium pressure is too small, the sealing degree is poor; when the medium pressure is too large, it is necessary to consider whether the sealing ring material can withstand the working load of the sphere medium, and the application range is limited. The sphere of the elastic ball valve is elastic, and both the sphere and the valve seat sealing ring are made of metal materials. The sealing specific pressure is very large, and the sealing requirement cannot be achieved only by the pressure of the medium itself, and external force must be applied. However, after the elastic member works for a long time, elastic fatigue or plastic deformation will occur, resulting in a weakening of the pressing force of the sealing pair and a corresponding decrease in the valve sealing performance.

[0005] Therefore, a ball valve structure is needed that can apply an external force to the sealing pair when the pressure of the medium itself cannot meet the sealing requirements, and at the same time, the pre-pressing force should be dynamically adjustable to adapt to the wear of the opening and closing members after the valve has been used for a long time.

[0006] In addition, when the ball valve is applied to sewage and raw water systems, serious scaling will occur. This type of water scale is different from the scaling in equipment such as high-temperature boilers. Instead, it adheres to the sealing pair of the opening and closing members in a way similar to the precipitation of mineral crystals, with strong adhesion and difficult to remove, affecting the valve sealing, causing valve jamming, increasing the valve opening and closing torque, and in severe cases, the valve cannot be opened or closed and fails to function. Summary of the Invention

[0007] The object of the present invention is to provide a self-cleaning high-pressure sealed ball valve, which solves the problems that the existing ball valves are difficult to open and close due to scaling during use and the sealing degree is damaged, and at the same time solves the problems that the pre-compression force of the sealing pair of the opening and closing member cannot be dynamically adjusted by external force and the opening and closing member cannot be automatically compensated after wear.

[0008] To solve the above technical problems, the technical solution adopted by the present invention is as follows:

[0009] A self-cleaning high-pressure sealed ball valve includes a valve body, an opening and closing member and a valve stem. The opening and closing member is composed of a first hemispherical opening and closing member and a second hemispherical opening and closing member. The first hemispherical opening and closing member and the second hemispherical opening and closing member are connected to the longitudinal valve stem. Both the first hemispherical opening and closing member and the second hemispherical opening and closing member have two degrees of freedom. The first degree of freedom is that the first hemispherical opening and closing member and the second hemispherical opening and closing member rotate around the valve stem axis as a whole to realize the opening and closing of the valve. The second degree of freedom is that the first hemispherical opening and closing member and the second hemispherical opening and closing member move horizontally along their own axes respectively to adjust the pressing force of the sealing pair.

[0010] Further, the valve stem is a cross valve stem, a horizontal axis is vertically arranged on the longitudinal axis. The lower end of the longitudinal axis of the cross valve stem is arranged at the bottom of the inner cavity of the valve body. The longitudinal axis of the cross valve stem can rotate around its own axis. A rotating sleeve is sleeved on the upper end of the longitudinal axis of the cross valve stem. The top end of the rotating sleeve extends out of the inner cavity of the valve body. An opening and closing driving device is arranged at the top end of the rotating sleeve. The rotation of the rotating sleeve is controlled by the opening and closing driving device. The first hemispherical opening and closing member and the second hemispherical opening and closing member are installed on the horizontal axis of the cross valve stem. The rotation action of the rotating sleeve can drive the first hemispherical opening and closing member and the second hemispherical opening and closing member to expand or contract and rotate.

[0011] In addition to being able to complete the conventional rotation opening and closing action, the two parts of the opening and closing member can perform a certain range of expansion actions. This action can be triggered by external force. Therefore, it is possible to adjust the expansion degree of the opening and closing member by external force, and correspondingly adjust the pre-compression force of the valve body sealing pair to ensure the reliability of the sealing degree of the ball valve.

[0012] Furthermore, a first bevel gear is fixedly connected to the lower end of the rotating sleeve. The rotating sleeve together with the first bevel gear can rotate around the axis of the longitudinal axis of the cross valve stem. A second bevel gear and a third bevel gear are respectively arranged at both ends of the transverse axis of the cross valve stem. The second bevel gear and the third bevel gear can rotate around the axis of the transverse axis of the cross valve stem. The first bevel gear meshes with both the second bevel gear and the third bevel gear at the same time. A telescopic shaft is arranged at the flat end of the first hemispherical closing member and the second hemispherical closing member. The outer circle of the telescopic shaft is threaded and the inner hole is a spline hole. Corresponding splines are arranged at both ends of the transverse axis. The telescopic shaft is sleeved on the transverse axis, and the splines on the transverse axis correspond to the spline holes of the telescopic shaft, so that the telescopic shaft has a lateral telescopic freedom degree relative to the transverse axis. An internally threaded sleeve is fixedly arranged outside the second bevel gear and the third bevel gear. The internally threaded sleeve is in threaded cooperation with the outer circle thread of the telescopic shaft, forming a lead screw-nut structure to provide power for the telescopic movement of the telescopic shaft. An elastic reset member and a limiting member are arranged on the longitudinal axis of the cross valve stem. Preferably, the elastic reset member is a torsion spring and the limiting member is a limit pin. In the state where no external force acts on the cross valve stem, the transverse axis of the cross valve stem coincides with the axis of the valve seat.

[0013] Furthermore, in order to avoid the influence of pipeline scaling on the valve operation and sealing performance, a scaling cleaning device is arranged in the valve body. The scaling cleaning device is arranged at the inlet and outlet of the valve body. The scaling cleaning device includes a sealing ring, a rotating frame, a paddle and a fixed bracket. The sealing ring is floatingly arranged between the closing member and the inner wall of the valve body through a flexible rotating frame. The tail of the rotating frame is provided with a rotating shaft, and the rotating shaft is fixed through the fixed bracket. A paddle is arranged on the rotating shaft. When the closing member is in the opening process and the open state, the medium flows through the valve body, and the paddle is forced to rotate, thereby driving the sealing ring to rotate. The rotating action of the sealing ring can effectively remove the scaling on the sealing pair part of the inner cavity of the valve body. During the opening and closing process of the closing member, the rotating sealing ring will contact the edge of the closing member, and the closing member can be cleaned.

[0014] The working principle of the present invention is as follows:

[0015] The first hemispherical closing member and the second hemispherical closing member compress the sealing ring, and the valve is in the closed state. To open the valve, the opening and closing drive device controls the rotation sleeve to start rotating. Initially, it is the first stage. Due to the spring force of the torsion spring acting on the cross valve stem, the cross valve stem remains stationary. The first bevel gear drives the second bevel gear and the third bevel gear to rotate respectively, and the rotation directions are opposite. The internal thread sleeve on the back of the second bevel gear rotates, and the lead screw nut structure causes the first hemispherical closing member to perform a mirror linear motion away from the sealing ring. The second hemispherical closing member has a mirror image relationship with the first hemispherical closing member, and the principle is the same. During this process, the sealing ring is relaxed, and a small amount of medium will flow through the valve body in the working state, and the sealing ring starts to rotate. The scale on the sealing part will be cleaned during the rotation process. This process will cause the first hemispherical closing member and the second hemispherical closing member to approach each other and finally reach the extreme position. Next, enter the second stage. Control the rotation sleeve to continue rotating in the previous direction. Since the first hemispherical closing member and the second hemispherical closing member have reached the minimum limit position and cannot continue to reduce the distance, the relative movement between the first bevel gear, the second bevel gear and the third bevel gear stops, and the relative movement between the first hemispherical closing member and the second hemispherical closing member stops. As a whole, it starts to flip along the axis of the longitudinal axis of the cross valve stem. The spring force of the torsion spring will be overcome during the flipping process. After the first hemispherical closing member and the second hemispherical closing member flip 90°, the valve is in the open state. In this state, the medium flows through the valve body, and the sealing ring rotates. The scale on the inner side of the valve body will be continuously cleaned during the rotation process.

[0016] When the valve is in the open state and needs to be closed, the opening and closing drive device controls the rotation sleeve to rotate in the reverse direction. At this time, it is the third stage. Under the action of the torsion spring, the first hemispherical closing member and the second hemispherical closing member will flip in the reverse direction as a whole until the limit pin reaches the extreme position. At this time, the horizontal axis of the cross valve stem coincides with the axis of the sealing ring. The rotation sleeve continues to rotate and enters the fourth stage. At this time, because the cross valve stem remains stationary under the combined action of the torsion spring and the limit pin, the first bevel gear drives the second bevel gear and the third bevel gear to rotate. This stage is the reverse of the first stage, and the principle is the same, so it will not be elaborated. The first hemispherical closing member and the second hemispherical closing member are respectively pushed towards their corresponding sealing rings. The sealing ring is in a rotating state before being compressed during the pushing process. The scale on the inner side of the valve body and the sealing part of the closing member will be continuously cleaned during the rotation process. If necessary, the rotation sleeve can be controlled by the opening and closing drive device to stay in this critical state, which can achieve the purpose of cleaning the scale on the inner side of the valve body and the sealing part of the closing member. If the rotation sleeve continues to rotate, the first hemispherical closing member and the second hemispherical closing member will increase the pressing force on the sealing ring. The pushing distance of the closing member and the magnitude of the pressing force are dynamically controlled by the opening and closing drive device, which is convenient for adjustment. When the closing member is slightly worn and consumed, it can be compensated by the pushing distance of the closing member, so as to meet the requirements of high-pressure sealing. The pre-pressing force of the sealing pair part depends on the torque input by the opening and closing drive device, and the control is convenient.

[0017] The beneficial effects of the present invention are as follows:

[0018] During the opening and closing process of the present invention and when the valve is in the open state, it can automatically clean the scale on the contact part of the sealing valve. In addition, during the opening and closing process, along with the contraction and expansion of the opening and closing member, the influence of the scaling phenomenon on the opening and closing and sealing degree of the valve is minimized; the external force can act on the sealing pair, and the pre-compression force of the sealing pair can be adjusted through the torque of the opening and closing drive device, which is convenient for control; when the opening and closing member is slightly worn and consumed, it can be compensated by the advancing distance of the opening and closing member, so as to meet the requirements of high-pressure sealing and extend the service life of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The present invention will be further described in detail below in conjunction with the drawings and specific embodiments.

[0020] Figure 1 It is a schematic structural diagram of the valve in the closed state of the present invention.

[0021] Figure 2 It is a schematic structural diagram of the opening and closing member in the contracted state of the present invention.

[0022] Figure 3 It is a schematic structural diagram of the valve in the open state of the present invention.

[0023] Figure 4 is Figure 2 partial enlarged view of.

[0024] Figure 5 It is a schematic sectional structure diagram of the transmission part of the opening and closing member.

[0025] In the figure: 1 - valve body; 2 - scale cleaning device; 201 - sealing ring; 202 - rotating frame; 203 - paddle; 204 - fixed bracket; 3 - opening and closing member; 301 - first hemispherical opening and closing member; 302 - second hemispherical opening and closing member; 4 - cross valve stem; 401 - horizontal axis; 5 - rotating sleeve; 6 - sealing packing; 7 - worm gear; 8 - worm; 9 - rotating shaft; 10 - runner; 11 - first bevel gear; 12 - second bevel gear; 13 - third bevel gear; 14 - sealing sleeve; 15 - torsion spring; 16 - limit pin; 17 - telescopic shaft; 18 - internal thread sleeve. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0026] As shown in the figure, as Figures 1 to 3As shown in the figure, a self-cleaning high-pressure sealed ball valve includes a valve body 1, a closing member 3 and a valve stem. The closing member 3 is composed of a first hemispherical closing member 301 and a second hemispherical closing member 302. The first hemispherical closing member 301 and the second hemispherical closing member 302 are connected to the longitudinal valve stem. Both the first hemispherical closing member 301 and the second hemispherical closing member 302 have two degrees of freedom. The first degree of freedom is that the first hemispherical closing member 301 and the second hemispherical closing member 302 rotate around the valve stem axis as a whole to realize the opening and closing of the valve. The second degree of freedom is that the first hemispherical closing member 301 and the second hemispherical closing member 302 move horizontally along their own axes respectively to adjust the pressing force of the sealing pair.

[0027] Further, the valve stem is a cross valve stem 4. A horizontal axis 401 is vertically arranged on the longitudinal axis. The lower end of the longitudinal axis of the cross valve stem 4 is arranged at the bottom of the inner cavity of the valve body 1. The longitudinal axis of the cross valve stem 4 can rotate around its own axis. A rotating sleeve 5 is sleeved on the upper end of the longitudinal axis of the cross valve stem 4. The top of the rotating sleeve 5 extends out of the inner cavity of the valve body 1. An opening and closing driving device is arranged at the top of the rotating sleeve 5. By controlling the rotation of the rotating sleeve 5 through the opening and closing driving device, the first hemispherical closing member 301 and the second hemispherical closing member 302 are installed on the horizontal axis 401 of the cross valve stem 4. The rotation action of the rotating sleeve 5 can drive the first hemispherical closing member 301 and the second hemispherical closing member 302 to expand or contract and rotate.

[0028] In addition to being able to complete the conventional rotation opening and closing action, the two parts of the closing member 3 can perform a certain range of expansion actions. This action can be triggered by an external force. Therefore, it can be realized that the expansion degree of the closing member 3 is adjusted by an external force, and the pre-pressing force of the valve body sealing pair is correspondingly adjusted to ensure the reliability of the sealing degree of the ball valve.

[0029] The opening and closing driving device includes a worm gear 7, a worm 8 and a rotating shaft 9. The worm gear 7 is connected to the rotating sleeve 5. The worm gear 7 cooperates with the worm 8. The input end of the worm 8 is the rotating shaft 9. The rotating shaft 9 is connected to a power source. The power source can be an electric device, a pneumatic device or a manual device. In the figure, the power source is a manual rotating wheel 10. The worm and worm gear structure can increase the torque, so as to provide sufficient power for the opening and closing action of the valve. In addition, the worm and worm gear itself has self-locking property and can be maintained in the open or closed state of the valve.

[0030] A sealing packing 6 is arranged at the connection between the rotating sleeve 5 and the valve body 1 to ensure the sealing degree between the rotating sleeve 5 and the valve body 1.

[0031] Further, a first bevel gear 11 is fixedly connected to the lower end of the rotating sleeve 5. The rotating sleeve 5 together with the first bevel gear 11 can rotate around the axis of the longitudinal axis of the cross valve stem 4. A second bevel gear 12 and a third bevel gear 13 are respectively arranged at both ends of the transverse axis 401 of the cross valve stem 4. The second bevel gear 12 and the third bevel gear 13 can rotate around the axis of the transverse axis 401 of the cross valve stem 4. The first bevel gear 11 meshes with both the second bevel gear 12 and the third bevel gear 13. Combining Figure 4 and Figure 5 , a telescopic shaft 17 is arranged at the flat end of the first hemispherical closing member 301 and the second hemispherical closing member 302. The outer circle of the telescopic shaft 17 is threaded and the inner hole is a spline hole. Corresponding splines are arranged at both ends of the transverse axis 401. The telescopic shaft 17 is sleeved on the transverse axis 401, and the splines on the transverse axis 401 correspond to the spline holes of the telescopic shaft 17, so that the telescopic shaft 17 has a transverse telescopic freedom degree relative to the transverse axis 401. An internally threaded sleeve 18 is fixedly arranged outside the second bevel gear 12 and the third bevel gear 13. The internally threaded sleeve 18 is in threaded cooperation with the outer circle of the telescopic shaft 17 to form a lead screw-nut structure to provide power for the telescopic movement of the telescopic shaft 17. An elastic reset member and a limiting member are arranged on the longitudinal axis of the cross valve stem 4.

[0032] Preferably, the elastic reset member is a torsion spring 15, and the limiting member is a limiting pin 16. When there is no external force acting on the cross valve stem 4, the transverse axis 401 of the cross valve stem 4 coincides with the axis of the valve seat 2.

[0033] Further, in order to avoid the influence of pipeline scaling on the valve action and sealing performance, a scale cleaning device 2 is arranged in the valve body 1. The scale cleaning device 2 is arranged at the inlet and outlet of the valve body 1. The scale cleaning device 2 includes a sealing ring 201, a rotating frame 202, a paddle 203 and a fixed bracket 204. The sealing ring 201 is floatingly arranged between the closing member 3 and the inner wall of the valve body 1 through a flexible rotating frame 202. The tail of the rotating frame 202 is provided with a rotating shaft, and the rotating shaft is fixed through the fixed bracket 204. A paddle 203 is arranged on the rotating shaft.

[0034] The working principle of the scale cleaning device 2 is as follows: When the closing member 3 is in the opening process and the open state, the medium flows through the valve body 1, and the paddle 203 is forced to rotate, thereby driving the sealing ring 201 to rotate. The rotation action of the sealing ring 201 can effectively remove the scale on the sealing pair part of the inner cavity of the valve body 1. During the opening and closing processes of the closing member 3, the rotating sealing ring 201 will contact the edge of the closing member 3, and the closing member 3 can be cleaned.

[0035] The working principle of the present invention is as follows:

[0036] As Figure 1As described above, the first hemispherical closing member 301 and the second hemispherical closing member 302 press against the sealing ring 201, and the valve is in a closed state. If the valve is to be opened, the opening and closing drive device controls the rotation sleeve 5 to start rotating. Initially, it is the first stage. Due to the spring force of the torsion spring 15 acting on the cross valve stem 4, the cross valve stem 4 remains stationary. The first bevel gear 11 drives the second bevel gear 12 and the third bevel gear 13 to rotate respectively, and the rotation directions are opposite. The internal thread sleeve 18 on the back of the second bevel gear 12 rotates. The lead screw nut structure causes the first hemispherical closing member 301 to perform a mirror linear motion away from the sealing ring 201. The second hemispherical closing member 302 is in a mirror image relationship with the first hemispherical closing member 301, and the principle is the same. The movement directions of the first hemispherical closing member 301 and the second hemispherical closing member 302 are jointly determined by the rotation direction of the rotation sleeve 5 and the helix direction of the thread. When designing, the rotation direction of the rotation sleeve 5 when opening is determined, and only the helix directions of the two internal thread sleeves 18 need to be determined to determine the movement directions and mirror movement relationship of the first hemispherical closing member 301 and the second hemispherical closing member 302. During this process, the sealing ring 201 is relaxed, and a small amount of medium will flow through the valve body in the working state. The sealing ring 201 starts to rotate, and the scale on the sealing part will be cleaned during the rotation process. This process will cause the first hemispherical closing member 301 and the second hemispherical closing member 302 to approach each other and finally reach the extreme limit position, and the state is as Figure 2 shown; Next, enter the second stage. Control the rotation sleeve 5 to continue rotating in the previous direction. Since the first hemispherical closing member 301 and the second hemispherical closing member 302 have reached the minimum limit position and cannot continue to reduce the distance, the relative movement between the first bevel gear 11, the second bevel gear 12 and the third bevel gear 13 stops, and the relative movement between the first hemispherical closing member 301 and the second hemispherical closing member 302 stops. As a whole, it starts to flip along the axis of the longitudinal axis of the cross valve stem 4. The flipping process will overcome the spring force of the torsion spring 15. After the first hemispherical closing member 301 and the second hemispherical closing member 302 flip 90°, as Figure 3 shown, the valve is in an open state. In this state, the medium flows through the valve body, and the sealing ring 201 rotates. The scale on the inner sealing part of the valve body 1 will be continuously cleaned during the rotation process.

[0037] When the valve is in an open state and needs to be closed, the opening and closing drive device controls the rotation sleeve 5 to rotate in the reverse direction. At this time, it is the third stage. Under the action of the torsion spring 15, the first hemispherical closing member 301 and the second hemispherical closing member 302 will flip in the reverse direction as a whole until the limit pin 16 reaches the extreme limit position. At this time, the axis of the horizontal axis 401 of the cross valve stem 4 coincides with the axis of the sealing ring 201, and the state is as Figure 2As shown; the rotating sleeve 5 continues to rotate and enters the fourth stage. At this time, since the cross valve stem 4 remains stationary under the combined action of the torsion spring 15 and the limit pin 16, the first bevel gear 11 drives the second bevel gear 12 and the third bevel gear 13 to rotate. This stage is the reverse of the first stage and has the same principle, so it will not be elaborated here. The first hemispherical closing member 301 and the second hemispherical closing member 302 are respectively pushed towards their corresponding sealing rings 201. Before the sealing ring 201 is pressed tightly during the pushing process, it is in a rotating state, and the rotating process will continuously clean the scale on the inner side of the valve body 1 and the sealing part of the closing member. If necessary, the rotating sleeve 5 can be controlled by the opening and closing driving device to stay in this critical state, which can achieve the purpose of cleaning the scale on the inner side of the valve body 1 and the sealing part of the closing member. If the rotating sleeve 5 continues to rotate, the first hemispherical closing member 301 and the second hemispherical closing member 302 will increase the pressing force on the sealing ring 201. The advancing distance of the closing member and the magnitude of the pressing force are dynamically controlled by the opening and closing driving device, which is convenient for adjustment. When the closing member undergoes slight wear and consumption, it can be compensated by the advancing distance of the closing member, so as to meet the requirements of high-pressure sealing. The pre-pressing force of the sealing pair part depends on the torque input by the opening and closing driving device, and the control is convenient.

[0038] Preferably, the sealing ring 201 is a metal ring, belonging to hard sealing. Compared with the soft sealing of a rubber ring, the sealing pair can withstand a greater pre-pressing force to be applicable to a high-pressure working environment.

[0039] Preferably, a sealing sleeve 14 is provided at the lower end of the longitudinal axis of the cross valve stem 4. The function of the sealing sleeve 14 is to protect the elastic resetting member and the limiting member from contacting the medium in the valve body.

[0040] The above-disclosed are only specific embodiments of this patent, but this patent is not limited thereto. For those of ordinary skill in the art, without departing from the principle of the present invention, the deformations made should be regarded as belonging to the protection scope of the present invention.

Claims

1. A self-cleaning high-pressure sealed ball valve, comprising a valve body (1), a closing member (3) and a valve stem, characterized in that: The opening and closing member (3) is composed of a first hemispherical opening and closing member (301) and a second hemispherical opening and closing member (302). The first hemispherical opening and closing member (301) and the second hemispherical opening and closing member (302) are connected to a longitudinal valve stem. Both the first hemispherical opening and closing member (301) and the second hemispherical opening and closing member (302) have two degrees of freedom. The first degree of freedom is that the first hemispherical opening and closing member (301) and the second hemispherical opening and closing member (302) rotate as a whole around the valve stem axis. The second degree of freedom is that the first hemispherical opening and closing member (301) and the second hemispherical opening and closing member (302) move horizontally along their own axes respectively. The valve stem is a cross valve stem (4). A horizontal axis (401) is vertically arranged on the longitudinal axis. The lower end of the longitudinal axis of the cross valve stem (4) is arranged at the bottom of the inner cavity of the valve body (1). The longitudinal axis of the cross valve stem (4) can rotate around its own axis. A rotating sleeve (5) is sleeved on the upper end of the longitudinal axis of the cross valve stem (4). The top of the rotating sleeve (5) extends out of the inner cavity of the valve body (1). An opening and closing driving device is arranged at the top of the rotating sleeve (5). The rotation of the rotating sleeve (5) is controlled by the opening and closing driving device. The first hemispherical opening and closing member (301) and the second hemispherical opening and closing member (302) are installed on the horizontal axis (401) of the cross valve stem (4). The opening and closing driving device includes a worm gear (7), a worm (8) and a rotating shaft (9). The worm gear (7) is connected to the rotating sleeve (5). The worm gear (7) cooperates with the worm (8). The input end of the worm (8) is the rotating shaft (9). The rotating shaft (9) is connected to a power source. A sealing packing (6) is arranged at the connection between the rotating sleeve (5) and the valve body (1). A first bevel gear (11) is fixedly connected to the lower end of the rotating sleeve (5). The rotating sleeve (5) together with the first bevel gear (11) can rotate around the axis of the longitudinal axis of the cross valve stem (4). A second bevel gear (12) and a third bevel gear (13) are respectively arranged at both ends of the horizontal axis (401) of the cross valve stem (4). The second bevel gear (12) and the third bevel gear (13) can rotate around the axis of the horizontal axis (401) of the cross valve stem (4). The first bevel gear (11) meshes with both the second bevel gear (12) and the third bevel gear (13) at the same time. A telescopic shaft (17) is arranged at the flat end of the first hemispherical opening and closing member (301) and the second hemispherical opening and closing member (302). The outer circle of the telescopic shaft (17) is threaded and the inner hole is a spline hole. Corresponding splines are arranged at both ends of the horizontal axis (401). The telescopic shaft (17) is sleeved on the horizontal axis (401). The splines on the horizontal axis (401) correspond to the spline hole of the telescopic shaft (17), so that the telescopic shaft (17) has a horizontal telescopic degree of freedom relative to the horizontal axis (401). An internally threaded sleeve (18) is fixedly arranged outside the second bevel gear (12) and the third bevel gear (13). The internally threaded sleeve (18) is in threaded cooperation with the outer thread of the telescopic shaft (17). An elastic resetting member and a limiting member are arranged on the longitudinal axis of the cross valve stem (4).

2. The self-cleaning high-pressure sealed ball valve according to claim 1, wherein: The elastic resetting member is a torsion spring (15), and the limiting member is a limiting pin (16).

3. The self-cleaning high-pressure sealed ball valve according to claim 2, wherein: A scale cleaning device (2) is arranged inside the valve body (1). The scale cleaning device (2) is arranged at the inlet and outlet of the valve body (1). The scale cleaning device (2) includes a sealing ring (201), a rotating frame (202), paddle blades (203) and a fixed bracket (204). The sealing ring (201) is floatingly arranged between the closing member (3) and the inner wall of the valve body (1) through a flexible rotating frame (202). The tail of the rotating frame (202) is provided with a rotating shaft, and the rotating shaft is fixed through the fixed bracket (204). The paddle blades (203) are arranged on the rotating shaft.

4. The self-cleaning high-pressure sealed ball valve according to claim 3, wherein: The sealing ring (201) is a metal ring.

5. The self-cleaning high-pressure sealed ball valve according to claim 4, wherein: A sealing sleeve (14) is arranged at the lower end of the longitudinal axis of the cross valve stem (4).

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