Double-seal leakage-proof ball valve

Abstract

The invention relates to the technical field of ball valves, and discloses a double-seal leakage-proof ball valve which comprises a valve body, a supporting rod is fixedly connected to the bottom face of the valve body, a motor is fixedly connected to the bottom end of the supporting rod, a threaded sleeve shaft is fixedly connected to the tail end of an output shaft of the motor, and a sealing structure is arranged in the valve body. Anti-backflow structures are arranged at the two ends of the interior of the valve body correspondingly, a lubricating structure is arranged on the inner wall of the bottom end of the valve body, a handle is rotationally connected to the top end of the valve body, ports are formed in the left end and the right end of the valve body correspondingly, the sealing structure comprises a rotating handle shaft, and a top sealing end shell is rotationally connected to the outer side of the rotating handle shaft; the bottom end of the rotating handle shaft is fixedly connected with a spline short rod, the bottom end of the spline short rod is fixedly connected with a bottom supporting block, switching can be conducted according to the actual use purpose, the two communication modes can be achieved at the same time to increase the internal circulation amount of the valve body, and practicability is improved.

Description

Technical Field

[0001] The invention relates to the technical field of ball valves, in particular to a double-sealed leak-proof ball valve. Background Art

[0002] Double seal anti-leakage ball valve is a ball valve with double seal structure in design, which is designed to improve its sealing performance, especially in the occasions requiring high sealing performance. Double seal anti-leakage ball valve ensures the sealing performance of the valve in various harsh environments through double seal structure, prevents medium leakage, and increases the safety and reliability of the system. It is widely used in petrochemical, electric power, natural gas and other fields, and is particularly suitable for use in high pressure, high temperature and dangerous medium control systems.

[0003] The patent with announcement number CN201368257Y discloses a double-sealed ball valve, including a valve body, a spherical valve seat arranged on the valve body, a spherical valve core, a valve stem and a dynamic sealing device, the dynamic sealing device including a stuffing box and a stuffing gland arranged between the valve body and the valve stem, a sealing stuffing layer is tightly pressed in the stuffing box by the stuffing gland, and a sealing ring is arranged in parallel with the sealing stuffing layer in the stuffing box. The patent adopts a structure of adding a layer of sealing ring in the stuffing box in the dynamic sealing device to achieve a double sealing effect, which can ensure that the ball valve does not leak externally for a long time, extend the normal service life of the ball valve, reduce the number of maintenance times, and improve the safety during use; the sealing stuffing layer will not cause leakage immediately after wear, and can also achieve good sealing in a working environment with special requirements, such as in a corrosive medium, but the patent still has the problem that the valve flow limiting structure is single and the valve flow control mode cannot be switched according to the use purpose, and it is easy to produce a water hammer effect to impact the valve body parts, so a double-sealed leak-proof ball valve is proposed to solve the above-mentioned problems. Summary of the invention

[0004] The technical problem to be solved by the present invention is to provide a double-seal anti-leakage ball valve in view of the deficiencies in the above-mentioned prior art.

[0005] In order to solve the above technical problems, the technical solution adopted by the present invention is: a double-seal anti-leakage ball valve, comprising a valve body, the bottom surface of the valve body is fixedly connected to a support rod, the bottom end of the support rod is fixedly connected to a motor, the end of the output shaft of the motor is fixedly connected to a threaded sleeve shaft, a sealing structure is arranged inside the valve body, both ends of the inside of the valve body are provided with anti-backflow structures, a lubrication structure is arranged on the inner wall of the bottom end of the valve body, a handle is rotatably connected to the top end of the valve body, and ports are arranged on both left and right ends of the valve body;

[0006] The sealing structure includes a handle shaft, the outer side of the handle shaft is rotatably connected to a top sealing end shell, the bottom end of the handle shaft is fixedly connected to a spline short rod, the bottom end of the spline short rod is fixedly connected to a bottom support block, the outer side of the bottom support block is provided with a short rod slide groove, the bottom of the bottom support block is provided with a ball valve, and the interior of the ball valve is provided with a valve channel.

[0007] According to the above technical solution, a push rod is fixedly connected to the axis of the bottom surface of the ball valve, a sealing valve housing is slidably connected to the outer side surface of the ball valve, and a bottom chamber is provided on the bottom surface of the ball valve.

[0008] The cam is connected with the valve body by the spring, and the cam is connected with the valve stem to form a circle around the cam, so that the cam can be turned off and the valve body is in a state of being ... , by slowly controlling the water flow, the water hammer effect can be suppressed, the water hammer effect can be prevented from affecting the stability of the internal structure of the valve body, and the pipe connected to the valve body can be prevented from being broken after multiple impacts. When the push rod is pushed to the top by the threaded sleeve shaft along the thread, the threaded sleeve shaft will drive the connected push rod to rotate together, and the direction of the valve channel in the ball valve can be adjusted by rotating the push rod. At this time, the ball valve drives the spline short rod to rotate through the short rod slide groove, so that the spline short rod drives the handle connected to the handle shaft to rotate. When manual control is required, the direction of the valve channel in the ball valve can also be changed directly by rotating the handle to drive the handle shaft, so that the ball valve with staggered valve channels can slide along the tightly fitting sealing valve shell, and the sealing valve shell can simultaneously seal the two ends of the valve channel of the ball valve and the ports at both ends of the valve body, thereby improving the sealing effect of the valve body and preventing the lifting valve body and the ball valve from leaking. In addition, the two control modes of connecting the valve channel with the port and the bottom chamber with the port can be switched according to the actual use purpose, and the two connection modes can also be realized at the same time to increase the internal flow of the valve body and improve practicality.

[0009] According to the above technical solution, the anti-backflow structure includes a pressure-applying thin rod, a thin rod slide groove is opened on the outer side of the top sealing end shell, a force-bearing slide is arranged below the thin rod slide groove, two pressure-bearing inclined blocks are fixedly connected above the force-bearing slide, bending plates are fixedly connected at both ends of the force-bearing slide, a slide groove is arranged on the outer side of the force-bearing slide, an elastic rod is arranged at the bottom end of each bending plate, and a protective sleeve is slidably connected to the outer surface of the elastic rod.

[0010] According to the above technical solution, one end of the protective sleeve away from the bending piece is fixedly connected to a sliding rod frame, the end of the sliding rod frame is fixedly connected to a blocking ring, and one end of the elastic rod away from the bending piece is fixedly connected to a rubber sheet.

[0011] According to the above technical solution, the pressure-applying thin rod is slidably connected with the top sealing end shell, the side surface of each of the pressure-bearing inclined blocks is provided with an inclined surface, the blocking ring is fixedly connected to the valve body, an elastic spring is provided on the outer side of the elastic rod, and the two ends of the elastic spring are respectively fixedly connected to the protective sleeve and the sliding rod frame, and the sliding plate groove is opened inside the top end of the valve body. When the turning handle shaft rotates, it will drive the connected pressure-applying thin rod to rotate along the thin rod sliding groove opened in the top sealing end shell. After rotation, the pressure-applying thin rod contacts the inclined surface of the pressure-bearing inclined block. The pressure-bearing inclined block is subjected to force and will push the connected force-bearing sliding plate to move downward along the sliding plate groove, thereby allowing the curved plate connected to the force-bearing sliding plate to be The folding piece contacts the elastic rod. After the conical surface at the end of the elastic rod is compressed, it will slide along the sliding rod frame and squeeze the elastic spring to be compressed, so that the elastic rod pushes the rubber sheet away from the blocking ring. When the side of the rubber sheet away from the blocking ring is subjected to force due to backflow, the rubber sheet will push the connected elastic rod to slide along the sliding rod frame to stretch the elastic spring, and make the rubber sheet fit tightly against the blocking ring. After the valve body limits the flow, the rubber sheet can prevent the liquid in the pipe connected to the port from flowing back into the valve body, and at the same time, prevent the liquid inside the valve body from flowing back to another port. After the ball valve of the valve body is closed, the impact of the backflow on the internal structure of the valve body can be alleviated, further improving the sealing effect.

[0012] According to the above technical solution, the lubrication structure includes a rubber oil seal, a seal cavity is arranged inside the rubber oil seal, a narrow oil cavity is opened at the bottom end of the valve body, an oil storage chamber is opened at one end of the narrow oil cavity away from the seal cavity, an annular oil groove is opened on the side of the oil storage chamber, a connecting groove is fixedly connected to the top of the annular oil groove, and an inner through groove is opened on the side of the top sealing end shell.

[0013] According to the above technical scheme, the sleeve cavity is connected with the narrow oil cavity, the rubber oil seal is made of elastic rubber material as a whole, the bottom end of the rubber oil seal is fixedly connected to the push rod, the top end of the rubber oil seal is fixedly connected to the bottom surface of the valve body, and the annular oil groove is connected with the connecting groove. When the push rod moves upward, the push rod drives the connected rubber oil seal to squeeze the liquid inside the sleeve cavity, so that the liquid in the seal cavity enters the oil storage cavity in a full oil state along the narrow oil cavity. When the liquid in the oil storage cavity increases, the excess liquid in the oil storage cavity will be discharged upward along the connected annular oil groove, and the liquid in the annular oil groove is discharged into the inner through groove through the connected connecting groove. While the rubber oil seal is pressurized to lubricate the connection between the push rod and the valve body, the liquid in the oil storage chamber is squeezed into the connecting groove through hydraulic action, so that the liquid in the connecting groove lubricates the turning handle shaft in the top sealing end shell, thereby ensuring the normal operation of the two flow limiting modes of the ball valve, avoiding wear of the turning handle shaft or the push rod to affect the rotation smoothness, and extending the service life of the valve body through the self-maintenance of the wear parts of the structure.

[0014] The present invention adopts the above technical solution to bring the following beneficial effects:

[0015] 1. The double-seal leak-proof ball valve allows the ball valve with staggered valve channels to slide along the tightly fitting sealing valve housing, and the sealing valve housing simultaneously seals both ends of the valve channel of the ball valve and the ports at both ends of the valve body, thereby improving the sealing effect of the valve body and preventing the lifting valve body and the ball valve from leaking. In addition, the two control modes of connecting the valve channel with the port and connecting the bottom chamber with the port can be switched according to actual use, or the two connection modes can be realized at the same time to increase the internal flow of the valve body and improve practicality.

[0016] 2. The double-seal leak-proof ball valve uses a rubber sheet to prevent the liquid in the pipe connected to the port from flowing back into the valve body. At the same time, it prevents the liquid inside the valve body from flowing back to another port. After the ball valve of the valve body is closed, the impact of the backflow on the internal structure of the valve body can be alleviated, further improving the sealing effect.

[0017] 3. The double-seal leak-proof ball valve uses hydraulic pressure to squeeze the liquid in the oil storage chamber into the connecting groove, allowing the liquid in the connecting groove to lubricate the handle shaft in the top sealing end shell, thereby ensuring the normal operation of the two flow limiting modes of the ball valve, avoiding wear of the handle shaft or push rod that affects the smoothness of rotation, and extending the service life of the valve body through structural self-maintenance of worn parts. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic diagram of the overall front three-dimensional structure of the present invention;

[0019] Figure 2 It is a schematic diagram of the overall rear-view stereoscopic structure of the present invention;

[0020] Figure 3This is a schematic diagram of the internal structure of the valve body of the present invention;

[0021] Figure 4 is a schematic diagram of the sealing structure of the present invention;

[0022] Figure 5 It is a schematic diagram of the anti-backflow structure of the present invention;

[0023] Figure 6 It is a schematic diagram of the lubrication structure of the present invention.

[0024] In the figure: 1, valve body; 2, support rod; 3, motor; 4, threaded sleeve shaft; 5, sealing structure; 51, handle shaft; 52, top sealing end shell; 53, spline short rod; 54, bottom support block; 55, short rod slide; 56, ball valve; 57, push rod; 58, sealing valve shell; 59, valve channel; 510, bottom chamber; 6, anti-backflow structure; 61, pressure rod; 62, rod slide; 63, force slide; 64, pressure inclined block; 65, bending piece; 66, slide groove; 67, blocking ring; 68, slide rod frame; 69, elastic rod; 610, rubber sheet; 611, protective sleeve; 7, lubrication structure; 71, rubber oil seal; 72, seal cavity; 73, narrow oil cavity; 74, oil storage chamber; 75, annular oil groove; 76, connecting groove; 77, inner groove; 8, handle; 9, port. DETAILED DESCRIPTION

[0025] 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.

[0026] See also Figure 1-Figure 6 , one embodiment of the present invention is: a double-seal leak-proof ball valve, comprising a valve body 1, a support rod 2 is fixedly connected to the bottom surface of the valve body 1, a motor 3 is fixedly connected to the bottom end of the support rod 2, a threaded sleeve shaft 4 is fixedly connected to the end of the output shaft of the motor 3, a sealing structure 5 is arranged inside the valve body 1, anti-backflow structures 6 are arranged at both ends of the valve body 1, a lubrication structure 7 is arranged on the inner wall of the bottom end of the valve body 1, a handle 8 is rotatably connected to the top end of the valve body 1, and ports 9 are arranged at both left and right ends of the valve body 1;

[0027] The sealing structure 5 includes a handle shaft 51, the outer side of which is rotatably connected to a top sealing end shell 52, the bottom end of which is fixedly connected to a spline short rod 53, the bottom end of which is fixedly connected to a bottom support block 54, a short rod slide groove 55 is provided on the outer side of the bottom support block 54, a ball valve 56 is provided below the bottom support block 54, and a valve channel 59 is provided inside the ball valve 56.

[0028] A push rod 57 is fixedly connected to the axis center of the bottom surface of the ball valve 56 , a sealing valve housing 58 is slidably connected to the outer side surface of the ball valve 56 , and a bottom chamber 510 is provided on the bottom surface of the ball valve 56 .

[0029] The top sealing end shell 52 is fixedly connected to the top surface of the valve body 1, the outer surface of the spline short rod 53 is fixedly connected with a vertical bar, the short rod slide groove 55 is opened on the top surface of the ball valve 56, the spline short rod 53 is slidably connected to the short rod slide groove 55, the sealing valve shell 58 is fixedly connected to the inner wall of the valve body 1, the port 9 is communicated with the valve channel 59, the bottom chamber 510 is communicated with the port 9, and the bottom surface of the bottom support block 54 is provided with a return spring, and the two ends of the return spring are respectively fixedly connected to the bottom support block 54 and the ball valve 56. By slowly controlling the water flow, the water hammer effect can be suppressed, and the water hammer effect can be avoided to affect the stability of the internal structure of the valve body 1, and the pipeline connected to the valve body 1 can be prevented from being ruptured after multiple impacts. When the push rod 57 is pushed to the top by the threaded sleeve shaft 4 along the thread, the threaded sleeve shaft 4 will drive the connected push rod 57 to rotate together, and the ball valve 5 is adjusted by rotating the push rod 57. 6, at this time, the ball valve 56 drives the spline short rod 53 to rotate through the short rod slide groove 55, so that the spline short rod 53 drives the handle 8 connected to the handle shaft 51 to rotate. When manual control is required, the handle 8 can also be directly rotated to drive the handle shaft 51 to change the direction of the valve channel 59 in the ball valve 56, so that the ball valve 56 with the valve channel 59 staggered can slide along the tightly fitting sealing valve shell 58, and the sealing valve shell 58 can simultaneously seal the two ends of the valve channel 59 of the ball valve 56 and the ports 9 at both ends of the valve body 1, thereby improving the sealing effect of the valve body 1 and preventing the valve body 1 and the ball valve 56 from leaking. In addition, the two control modes of connecting the valve channel 59 with the port 9 and connecting the bottom chamber 510 with the port 9 can be switched according to actual use purposes, and the two connecting modes can also be realized at the same time to increase the internal flow of the valve body 1 and improve practicality.

[0030] The anti-backflow structure 6 includes a pressure-applying thin rod 61, a thin rod slide groove 62 is opened on the outer side of the top sealing end shell 52, a force-bearing slide plate 63 is arranged below the thin rod slide groove 62, two pressure-bearing inclined blocks 64 are fixedly connected above the force-bearing slide plate 63, bending plates 65 are fixedly connected at both ends of the force-bearing slide plate 63, a slide plate groove 66 is arranged on the outer side of the force-bearing slide plate 63, an elastic rod 69 is arranged at the bottom end of each bending plate 65, and a protective sleeve 611 is slidably connected to the outer surface of the elastic rod 69.

[0031] One end of the protective sleeve 611 away from the bending piece 65 is fixedly connected to the slide rod frame 68 , the end of the slide rod frame 68 is fixedly connected to the blocking ring 67 , and one end of the elastic rod 69 away from the bending piece 65 is fixedly connected to the rubber sheet 610 .

[0032] The pressure rod 61 is slidably connected to the top sealing end shell 52, and the side of each pressure inclined block 64 is provided with an inclined surface. The blocking ring 67 is fixedly connected to the valve body 1. An elastic spring is provided on the outer side of the elastic rod 69, and the two ends of the elastic spring are respectively fixedly connected to the protective sleeve 611 and the sliding rod frame 68. The sliding plate groove 66 is provided inside the top of the valve body 1, so that the elastic rod 69 pushes the rubber sheet 610 away from the blocking ring 67. When the side of the rubber sheet 610 away from the blocking ring 67 is affected by the reverse flow, the rubber sheet 610 is pushed away from the blocking ring 67. When force is applied, the rubber sheet 610 will push the connected elastic rod 69 to slide along the slide rod frame 68 to stretch the elastic spring, and make the rubber sheet 610 fit tightly with the blocking ring 67. Therefore, after the valve body 1 limits the flow, the rubber sheet 610 can prevent the liquid in the pipeline connected to the port 9 from flowing back into the valve body 1, and at the same time, prevent the liquid in the valve body 1 from flowing back to another port 9. After the ball valve 56 of the valve body 1 is closed, the impact of the backflow on the internal structure of the valve body 1 can be alleviated, further improving the sealing effect.

[0033] The lubrication structure 7 includes a rubber oil seal 71, a seal cavity 72 is arranged inside the rubber oil seal 71, a narrow oil cavity 73 is opened at the bottom end of the valve body 1, an oil storage chamber 74 is opened at one end of the narrow oil cavity 73 away from the seal cavity 72, an annular oil groove 75 is opened on the side of the oil storage chamber 74, a connecting groove 76 is fixedly connected to the top of the annular oil groove 75, and an inner through groove 77 is opened on the side of the top sealing end shell 52.

[0034] The sealing sleeve cavity 72 is connected with the narrow oil cavity 73. The rubber oil sealing sleeve 71 is made of elastic rubber material as a whole. The bottom end of the rubber oil sealing sleeve 71 is fixedly connected to the push rod 57, and the top end of the rubber oil sealing sleeve 71 is fixedly connected to the bottom surface of the valve body 1. The annular oil groove 75 is connected with the connecting groove 76. The excess liquid in the oil storage chamber 74 will be discharged upward along the connected annular oil groove 75, and the liquid in the annular oil groove 75 will be discharged into the inner connecting groove 77 through the connected connecting groove 76. While the rubber oil sealing sleeve 71 is pressurized to lubricate the connection between the push rod 57 and the valve body 1, the liquid in the oil storage chamber 74 is squeezed into the connecting groove 76 through hydraulic action, so that the liquid in the connecting groove 76 lubricates the turning handle shaft 51 in the top sealing end shell 52, thereby ensuring the normal operation of the two flow limiting modes of the ball valve 56, avoiding wear of the turning handle shaft 51 or the push rod 57 and affecting the rotation smoothness, and extending the service life of the valve body 1 through the self-maintenance of the wear parts of the structure.

[0035] Working principle: let the motor 3 connected to the support rod 2 be in working state, and the connected threaded sleeve shaft 4 is driven by the rotation of the motor 3, so that the threaded sleeve shaft 4 pushes the connected push rod 57, so that the push rod 57 pushes the connected ball valve 56 to slide upward along the inner wall of the bottom chamber 510, and let the connected ball valve 56 push the short rod slide groove 55 and the spline short rod 53 upward to slide, and the short rod slide groove 55 is upward close to the spline short rod 53 to squeeze the return spring under pressure. At this time, the right port 9 in the valve body 1 is connected with the inside of the bottom chamber 510, and is connected with the left port 9 through the bottom chamber 510. The valve is controlled to open through this structure, so as to facilitate the control of water flow rate and realize the control of water flow interruption and circulation. By slowly controlling the water flow, the water hammer effect can be suppressed, and the water hammer effect can be avoided to affect the stability of the internal structure of the valve body 1, and the pipe connected to the valve body 1 can be prevented from being ruptured after multiple impacts. When the push rod 57 is pushed to the top by the threaded sleeve shaft 4 along the thread, the threaded sleeve The shaft 4 will drive the connected push rod 57 to rotate together, and the direction of the valve channel 59 in the ball valve 56 is adjusted by rotating the push rod 57. At this time, the ball valve 56 drives the spline short rod 53 to rotate through the short rod slide groove 55, so that the spline short rod 53 drives the handle 8 connected to the handle shaft 51 to rotate. When manual control is required, the handle 8 can also be directly rotated to drive the handle shaft 51 to change the direction of the valve channel 59 in the ball valve 56, so that the ball valve 56 with the valve channel 59 staggered can slide along the tightly fitting sealing valve shell 58, and the sealing valve shell 58 can simultaneously seal the two ends of the valve channel 59 of the ball valve 56 and the ports 9 at both ends of the valve body 1, thereby improving the sealing effect of the valve body 1 and preventing the valve body 1 from leaking from the ball valve 56. In addition, the two control modes of connecting the valve channel 59 with the port 9 and connecting the bottom chamber 510 with the port 9 can be switched according to actual use purposes, and the two connecting modes can also be realized at the same time to increase the internal flow of the valve body 1 and improve practicality.

[0036] When the handle shaft 51 rotates, the connected pressure rod 61 will be driven to rotate along the rod slide groove 62 provided in the top sealing end shell 52. The rotated pressure rod 61 will contact the inclined surface of the pressure inclined block 64. The pressure inclined block 64 will push the connected force sliding plate 63 to move downward along the sliding plate groove 66, so that the bending piece 65 connected to the force sliding plate 63 will contact the elastic rod 69. After the cone surface at the end of the elastic rod 69 is compressed, it will slide along the sliding rod frame 68 and squeeze the elastic spring to be compressed, so that the elastic rod 69 pushes the rubber sheet 610 away from the blocking ring 67. When the side of the rubber sheet 610 away from the blocking ring 67 is stressed due to backflow, the rubber sheet 610 will push the connected elastic rod 69 to slide along the slide rod frame 68 to stretch the elastic spring, and make the rubber sheet 610 fit tightly with the blocking ring 67, so that after the valve body 1 limits the flow, the rubber sheet 610 prevents the liquid in the pipeline connected to the port 9 from backflowing back into the valve body 1, and at the same time, prevents the liquid in the valve body 1 from backflowing to another port 9. After the ball valve 56 of the valve body 1 is closed, the impact of the backflow on the internal structure of the valve body 1 can be alleviated, and the sealing effect can be further improved;

[0037] When the push rod 57 moves upward, the push rod 57 drives the connected rubber oil seal 71 to squeeze the liquid inside the seal cavity 72, so that the liquid in the seal cavity 72 enters the oil storage chamber 74 in the full oil state along the narrow oil cavity 73. When the liquid in the oil storage chamber 74 increases, the excess liquid in the oil storage chamber 74 will be discharged upward along the connected annular oil groove 75, and the liquid in the annular oil groove 75 is discharged into the inner through groove 77 through the connected connecting groove 76. While the rubber oil seal 71 is pressurized to lubricate the connection between the push rod 57 and the valve body 1, the liquid in the oil storage chamber 74 is squeezed into the connecting groove 76 through hydraulic action, so that the liquid in the connecting groove 76 lubricates the turning handle shaft 51 in the top sealing end shell 52, thereby ensuring the normal operation of the two flow limiting modes of the ball valve 56, avoiding wear of the turning handle shaft 51 or the push rod 57 and affecting the rotation smoothness, and extending the service life of the valve body 1 through the self-maintenance of the wear parts of the structure.

[0038] The present invention provides a double-seal anti-leakage ball valve. There are many methods and ways to implement the technical solution. The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be considered as the protection scope of the present invention. All components not specified in this embodiment can be implemented using existing technologies.

Claims

1. A double-seal anti-leakage ball valve, comprising a valve body (1), characterized in that: The bottom surface of the valve body (1) is fixedly connected to a support rod (2), the bottom end of the support rod (2) is fixedly connected to a motor (3), the end of the output shaft of the motor (3) is fixedly connected to a threaded sleeve shaft (4), a sealing structure (5) is provided inside the valve body (1), both ends of the inside of the valve body (1) are provided with anti-backflow structures (6), a lubrication structure (7) is provided on the inner wall of the bottom end of the valve body (1), the top end of the valve body (1) is rotatably connected to a handle (8), and ports (9) are provided at both left and right ends of the valve body (1); The sealing structure (5) comprises a handle shaft (51), the outer side of the handle shaft (51) is rotatably connected to a top sealing end shell (52), the bottom end of the handle shaft (51) is fixedly connected to a spline short rod (53), the bottom end of the spline short rod (53) is fixedly connected to a bottom support block (54), the outer side of the bottom support block (54) is provided with a short rod slide groove (55), the bottom of the bottom support block (54) is provided with a ball valve (56), and the interior of the ball valve (56) is provided with a valve channel (59).

2. The double-seal anti-leakage ball valve according to claim 1 is characterized in that: A push rod (57) is fixedly connected to the axis center of the bottom surface of the ball valve (56), a sealing valve housing (58) is slidably connected to the outer side surface of the ball valve (56), and a bottom chamber (510) is provided on the bottom surface of the ball valve (56).

3. The double-seal anti-leakage ball valve according to claim 2 is characterized in that: The top sealing end shell (52) is fixedly connected to the top surface of the valve body (1); the outer surface of the spline short rod (53) is fixedly connected with a vertical bar; the short rod sliding groove (55) is opened on the top surface of the ball valve (56); the spline short rod (53) is slidably connected to the short rod sliding groove (55).

4. The double-seal anti-leakage ball valve according to claim 3 is characterized in that: The sealing valve housing (58) is fixedly connected to the inner wall of the valve body (1), the port (9) is communicated with the valve channel (59), the bottom chamber (510) is communicated with the port (9), and a return spring is provided on the bottom surface of the bottom support block (54), and the two ends of the return spring are respectively fixedly connected to the bottom support block (54) and the ball valve (56).

5. The double-seal anti-leakage ball valve according to claim 4 is characterized in that: The anti-backflow structure (6) includes a pressure-applying thin rod (61), a thin rod sliding groove (62) is provided on the outer side of the top sealing end shell (52), a force-bearing sliding plate (63) is provided below the thin rod sliding groove (62), two pressure-bearing inclined blocks (64) are fixedly connected above the force-bearing sliding plate (63), bending plates (65) are fixedly connected at both ends of the force-bearing sliding plate (63), a sliding plate groove (66) is provided on the outer side of the force-bearing sliding plate (63), an elastic rod (69) is provided at the bottom end of each bending plate (65), and a protective sleeve (611) is slidably connected to the outer surface of the elastic rod (69).

6. The double-seal anti-leakage ball valve according to claim 5, characterized in that: One end of the protective sleeve (611) away from the bending piece (65) is fixedly connected to a slide rod frame (68), the end of the slide rod frame (68) is fixedly connected to a blocking ring (67), and one end of the elastic rod (69) away from the bending piece (65) is fixedly connected to a rubber sheet (610).

7. The double-seal anti-leakage ball valve according to claim 6, characterized in that: The pressure-applying thin rod (61) is slidably connected to the top sealing end shell (52), a slope is provided on the side surface of each of the pressure-bearing inclined blocks (64), and the blocking ring (67) is fixedly connected to the valve body (1).

8. The double-seal anti-leakage ball valve according to claim 7, characterized in that: An elastic spring is arranged on the outside of the elastic rod (69), and the two ends of the elastic spring are respectively fixedly connected to the protective sleeve (611) and the slide rod frame (68), and the slide plate groove (66) is opened inside the top end of the valve body (1).

9. The double-seal anti-leakage ball valve according to claim 8, characterized in that: The lubrication structure (7) comprises a rubber oil seal (71), a seal cavity (72) is arranged inside the rubber oil seal (71), a narrow oil cavity (73) is provided at the bottom end of the valve body (1), an oil storage chamber (74) is provided at one end of the narrow oil cavity (73) away from the seal cavity (72), an annular oil groove (75) is provided on the side of the oil storage chamber (74), a connecting groove (76) is fixedly connected to the top end of the annular oil groove (75), and an inner through groove (77) is provided on the side of the top sealing end shell (52).

10. The double-seal anti-leakage ball valve according to claim 9, characterized in that: The seal cavity (72) is connected to the narrow oil cavity (73); the rubber oil seal (71) is made of elastic rubber material as a whole; the bottom end of the rubber oil seal (71) is fixedly connected to the push rod (57); the top end of the rubber oil seal (71) is fixedly connected to the bottom surface of the valve body (1); and the annular oil groove (75) is connected to the connecting groove (76).

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