Double-sealed leak-proof ball valve

Abstract

The present invention relates to the technical field of ball valves, and discloses a double-sealed leak-proof ball valve, which includes a valve body. A support rod is fixedly connected to the bottom surface of the valve body. 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. Anti-counterflow structures are arranged at both ends inside the valve body. A lubricating 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. Ports are arranged at both the left and right ends of the valve body. The sealing structure includes a rotating handle shaft. A top sealing end shell is rotatably connected to the outside of the rotating handle shaft. A spline short rod is fixedly connected to the bottom end of the rotating handle shaft. A bottom support block is fixedly connected to the bottom end of the spline short rod. In the present invention, it can be switched according to the actual use purpose, or the two connection methods can be realized simultaneously to increase the internal flow rate of the valve body and improve the practicability.

Description

Technical Field

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

[0002] The double-sealed leak-proof ball valve is a ball valve with a double-sealed structure in design, aiming to improve its sealing performance. Especially in occasions requiring high sealing performance, the double-sealed leak-proof ball valve ensures the sealing of the valve in various harsh environments through the double-sealed structure, preventing the leakage of the medium, and increasing the safety and reliability of the system. It is widely used in fields such as petrochemical, electric power, and natural gas, and is especially suitable for control systems of high pressure, high temperature, and hazardous media.

[0003] The patent with the publication number CN201368257Y discloses a double-sealed ball valve, which includes 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 includes a stuffing box and a stuffing gland arranged between the valve body and the valve stem. A sealing packing layer is tightly pressed in the stuffing box through the stuffing gland, and a sealing ring is arranged in parallel with the sealing packing layer in the stuffing box. This patent adopts a structure of adding a sealing ring in the stuffing box in the dynamic sealing device to achieve a double-sealed 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; when the sealing packing layer is worn, it will not cause leakage immediately, and it can also achieve good sealing in special working environments, such as in corrosive media. However, this patent still has the problem that the valve flow-limiting structure is single and cannot switch the valve flow control method according to the use purpose, and it is easy to generate a water hammer effect and impact the valve body parts. Therefore, 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-sealed leak-proof ball valve in view of the above-mentioned deficiencies in the prior art.

[0005] To solve the above technical problems, the technical solution adopted by the present invention is: a double-sealed leak-proof ball valve, including a valve body, a support rod is fixedly connected to the bottom surface of the valve body, a motor is fixedly connected to the bottom end of the support rod, a threaded sleeve shaft is fixedly connected to the end of the output shaft of the motor, a sealing structure is arranged inside the valve body, anti-counterflow structures are arranged at both ends inside the valve body, a lubricating 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 at both the left and right ends of the valve body;

[0006] The sealing structure includes a rotating handle shaft, a top sealing end shell is rotatably connected to the outside of the rotating handle shaft, a spline short rod is fixedly connected to the bottom end of the rotating handle shaft, a bottom support block is fixedly connected to the bottom end of the spline short rod, a short rod sliding groove is arranged on the outside of the bottom support block, a ball valve is arranged below the bottom support block, and a valve passage is opened inside the ball valve.

[0007] According to the above technical solution, a push rod is fixedly connected to the center of the bottom surface of the ball valve, a sealing valve shell is slidably connected to the outer side surface of the ball valve, and a bottom cavity is arranged on the bottom surface of the ball valve.

[0008] According to the above technical solution, the top sealing end shell is fixedly connected to the top surface of the valve body, vertical bars are fixedly connected to the outer surface of the spline short rod, the short rod sliding groove is opened on the top surface of the ball valve, the spline short rod is slidably connected to the short rod sliding groove, the sealing valve shell is fixedly connected to the inner wall of the valve body, the port is communicated with the valve passage, the bottom cavity is communicated with the port, a return spring is arranged on the bottom surface of the bottom support block, and both ends of the return spring are fixedly connected to the bottom support block and the ball valve respectively. Let the support rod-connected motor be in a working state. Drive the connected threaded sleeve shaft by the rotation of the motor, so that the threaded sleeve shaft pushes the connected push rod, so that the push rod pushes the connected ball valve to slide upward along the inner wall of the bottom cavity, and the connected ball valve pushes the short rod sliding groove to slide with the spline short rod upward. Squeeze the return spring by approaching the spline short rod upward through the short rod sliding groove. At this time, the right port in the valve body is communicated with the inside of the bottom cavity, and is communicated with the left port through the bottom cavity. Control the opening of the valve through this structure, so as to conveniently control the water flow rate, realize the control of water flow cut-off and circulation, and suppress the generation of water hammer effect by slowly controlling the water flow, avoid the water hammer effect affecting the stability of the internal structure of the valve body, and prevent the pipeline connected to the valve body from bursting after being impacted multiple times. When the push rod is pushed to the topmost end along the thread by the threaded sleeve shaft, at this time, the threaded sleeve shaft will drive the connected push rod to rotate together, and adjust the orientation of the valve passage in the ball valve by the rotation of the push rod. At this time, the ball valve drives the spline short rod to rotate through the short rod sliding groove, so that the spline short rod drives the handle connected to the rotating handle shaft to rotate. When manual control is required, the orientation of the valve passage in the ball valve can also be changed directly by rotating the handle to drive the rotating handle shaft, so that the ball valve with the staggered valve passage slides along the tightly fitting sealing valve shell, and the sealing valve shell seals both ends of the valve passage of the ball valve and both ends of the port of the valve body at the same time, so as to improve the sealing effect of the valve body and prevent the valve body and the ball valve from leaking liquid. In addition, through the two control methods of communicating the valve passage with the port and communicating the bottom cavity with the port, it can be switched according to the actual use purpose, or the two communication methods can be realized at the same time to increase the internal flow rate of the valve body and improve the practicability.

[0009] According to the above technical solution, the anti-backflow structure includes a pressure-applying thin rod. A thin rod sliding groove is provided on the outer side of the top sealing end shell. A force-receiving sliding piece is arranged below the thin rod sliding groove. Two pressure-receiving inclined blocks are fixedly connected above the force-receiving sliding piece. Bent pieces are fixedly connected to both ends of the force-receiving sliding piece. A sliding piece groove is arranged on the outer side of the force-receiving sliding piece. Elastic rods are arranged at the bottom ends of each bent piece. 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 bent piece is fixedly connected to a sliding rod frame. A blocking ring is fixedly connected to the end of the sliding rod frame. One end of the elastic rod away from the bent piece is fixedly connected to a rubber sheet.

[0011] According to the above technical solution, the pressure-applying thin rod is slidably connected to the top sealing end shell. An inclined surface is provided on the side of each pressure-receiving inclined block. The blocking ring is fixedly connected to the valve body. A elastic force spring is arranged on the outer side of the elastic rod, and both ends of the elastic force spring are fixedly connected to the protective sleeve and the sliding rod frame respectively. The sliding piece groove is opened inside the top end of the valve body. When the rotating handle shaft rotates, it will drive the connected pressure-applying thin rod to rotate along the thin rod sliding groove opened on the top sealing end shell. After rotation, the pressure-applying thin rod contacts the inclined surface of the pressure-receiving inclined block. The pressure-receiving inclined block will push the connected force-receiving sliding piece to move downward along the sliding piece groove, so that the bent piece connected to the force-receiving sliding piece contacts the elastic rod. After the conical surface at the end of the elastic rod is pressed, it will slide along the sliding rod frame and compress the elastic force spring, 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 stressed due to backflow, the rubber sheet will push the connected elastic rod to slide along the sliding rod frame and stretch the elastic force spring, and make the rubber sheet closely fit with the blocking ring. Thus, after the valve body limits the flow, the rubber sheet can prevent the liquid in the pipeline 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, it can relieve the impact of backflow on the internal structure of the valve body and further improve the sealing effect.

[0012] According to the above technical solution, the lubrication structure includes a rubber oil seal sleeve. A seal sleeve cavity is arranged inside the rubber oil seal sleeve. 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 sleeve cavity. An annular oil groove is opened on the side of the oil storage chamber. A communication groove is fixedly connected to the top end of the annular oil groove. An internal through groove is opened on the side of the top sealing end shell.

[0013] According to the above technical solution, the envelope cavity is communicated with the narrow oil cavity. The rubber oil seal sleeve is made of elastic rubber as a whole. The bottom end of the rubber oil seal sleeve is fixedly connected to the push rod, and the top end of the rubber oil seal sleeve is fixedly connected to the bottom surface of the valve body. The annular oil groove is communicated with the communication groove. When the push rod moves upward, the push rod drives the connected rubber oil seal sleeve to squeeze the liquid inside the envelope cavity, so that the liquid in the envelope 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 communication groove. While lubricating the connection between the push rod and the valve body by the pressure of the rubber oil seal sleeve, the liquid in the oil storage cavity is squeezed into the communication groove through the hydraulic action, so that the liquid in the communication groove lubricates the rotating shaft in the top sealing end shell, thus ensuring the normal operation of the two flow limiting methods of the ball valve, avoiding wear of the rotating shaft or the push rod and affecting the rotation smoothness, and prolonging the service life of the valve body by self-maintaining the worn parts through the structure.

[0014] Adopting the above technical solution, the present invention can bring the following beneficial effects:

[0015] 1. For this double-sealed leak-proof ball valve, the ball valve with staggered valve passages slides along the tightly fitting sealing valve housing, and the sealing valve housing seals both ends of the valve passage of the ball valve and both ends of the port of the valve body at the same time, thus improving the sealing effect of the valve body and preventing liquid leakage between the valve body and the ball valve. In addition, through the two control methods of connecting the valve passage with the port and connecting the bottom chamber with the port, it can be switched according to the actual use purpose, or the two connection methods can be realized simultaneously to increase the internal flow rate of the valve body and improve the practicability.

[0016] 2. For this double-sealed leak-proof ball valve, the rubber sheet prevents the liquid in the pipeline connected to the port from flowing back into the valve body, and at the same time, prevents the liquid inside the valve body from flowing back to another port. After the ball valve in the valve body is closed, it can relieve the impact of the backflow on the internal structure of the valve body and further improve the sealing effect.

[0017] 3. For this double-sealed leak-proof ball valve, the liquid in the oil storage cavity is squeezed into the communication groove through the hydraulic action, so that the liquid in the communication groove lubricates the rotating shaft in the top sealing end shell, thus ensuring the normal operation of the two flow limiting methods of the ball valve, avoiding wear of the rotating shaft or the push rod and affecting the rotation smoothness, and prolonging the service life of the valve body by self-maintaining the worn parts through the structure. BRIEF DESCRIPTION OF THE DRAWINGS

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

[0019] Figure 2 It is a rear three-dimensional structure schematic diagram of the whole of the present invention;

[0020] Figure 3Schematic diagram of the internal structure of the valve body of the present invention;

[0021] Figure 4 Schematic diagram of the sealing structure of the present invention;

[0022] Figure 5 Schematic diagram of the anti-backflow structure of the present invention;

[0023] Figure 6 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. Rotating handle shaft; 52. Top sealing end shell; 53. Spline short rod; 54. Bottom support block; 55. Short rod chute; 56. Ball valve; 57. Push rod; 58. Sealing valve housing; 59. Valve passage; 510. Bottom chamber; 6. Anti-backflow structure; 61. Pressing thin rod; 62. Thin rod chute; 63. Force-receiving sliding piece; 64. Compressed inclined block; 65. Bent piece; 66. Sliding piece chute; 67. Blocking ring; 68. Slide rod frame; 69. Elastic rod; 610. Rubber sheet; 611. Protective sleeve; 7. Lubrication structure; 71. Rubber oil seal sleeve; 72. Seal sleeve cavity; 73. Narrow oil cavity; 74. Oil storage chamber; 75. Annular oil groove; 76. Connecting groove; 77. Inner through groove; 8. Handle; 9. Port. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0026] Please refer to Figures 1-6 , one embodiment of the present invention is: a double-sealing leak-proof ball valve, including 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 inside 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 the left and right ends of the valve body 1;

[0027] The sealing structure 5 includes a rotating handle shaft 51, a top sealing end shell 52 is rotatably connected to the outside of the rotating handle shaft 51, a spline short rod 53 is fixedly connected to the bottom end of the rotating handle shaft 51, a bottom support block 54 is fixedly connected to the bottom end of the spline short rod 53, a short rod chute 55 is arranged on the outside of the bottom support block 54, a ball valve 56 is arranged below the bottom support block 54, and a valve passage 59 is opened inside the ball valve 56.

[0028] A push rod 57 is fixedly connected to the bottom center of the ball valve 56, a sealing valve housing 58 is slidably connected to the outer side of the ball valve 56, and a bottom chamber 510 is arranged 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. Vertical strips are fixedly connected to the outer surface of the spline short rod 53. The short rod chute 55 is opened on the top surface of the ball valve 56. The spline short rod 53 is slidably connected to the short rod chute 55. The sealing valve housing 58 is fixedly connected to the inner wall of the valve body 1. The port 9 communicates with the valve passage 59. The bottom chamber 510 communicates with the port 9. A return spring is arranged 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. By slowly controlling the water flow, the generation of water hammer effect can be inhibited, the influence of the water hammer effect on the internal structure stability of the valve body 1 can be avoided, and the pipeline connected to the valve body 1 can be prevented from being broken after being impacted multiple times. When the push rod 57 is pushed to the topmost end by the threaded sleeve shaft 4 along the thread, at this time, the threaded sleeve shaft 4 will drive the connected push rod 57 to rotate together. By rotating the push rod 57, the orientation of the valve passage 59 in the ball valve 56 is adjusted. At this time, the ball valve 56 drives the spline short rod 53 to rotate through the short rod chute 55, so that the spline short rod 53 drives the handle 8 connected to the rotating shaft 51 to rotate. When manual control is required, the orientation of the valve passage 59 in the ball valve 56 can also be directly changed by rotating the handle 8 to drive the rotating shaft 51, so that the ball valve 56 with the valve passage 59 staggered slides along the tightly fitting sealing valve housing 58. The sealing valve housing 58 seals both ends of the valve passage 59 of the ball valve 56 and both ends of the port 9 of the valve body 1 at the same time, thereby improving the sealing effect of the valve body 1 and preventing the valve body 1 and the ball valve 56 from leaking liquid. In addition, through the two control methods of the communication between the valve passage 59 and the port 9 and the communication between the bottom chamber 510 and the port 9, switching can be carried out according to the actual use purpose, or the two communication methods can be realized simultaneously to increase the internal flow rate of the valve body 1 and improve the practicability.

[0030] The anti-backflow structure 6 includes a pressure-applying thin rod 61. A thin rod chute 62 is opened on the outer side of the top sealing end shell 52. A force-receiving sliding piece 63 is arranged below the thin rod chute 62. Two pressure-receiving inclined blocks 64 are fixedly connected above the force-receiving sliding piece 63. Bent pieces 65 are fixedly connected to both ends of the force-receiving sliding piece 63. A sliding piece chute 66 is arranged on the outer side of the force-receiving sliding piece 63. Elastic rods 69 are arranged at the bottom ends of each bent piece 65. The outer surface of the elastic rod 69 is slidably connected to a protective sleeve 611.

[0031] One end of the protective sleeve 611 away from the bent piece 65 is fixedly connected to a sliding rod frame 68. A blocking ring 67 is fixedly connected to the end of the sliding rod frame 68. One end of the elastic rod 69 away from the bent piece 65 is fixedly connected to a rubber piece 610.

[0032] The pressure-applying thin rod 61 is slidably connected to the top-sealing end shell 52. Each side of the pressure-receiving inclined block 64 is provided with an inclined surface. The blocking ring 67 is fixedly connected to the valve body 1. A spring is arranged outside the elastic rod 69, and both ends of the spring are fixedly connected to the protective sleeve 611 and the slide rod frame 68 respectively. The slide piece groove 66 is opened inside the top end 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 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 spring, and make the rubber sheet 610 closely fit the blocking ring 67. Thus, after the flow rate of the valve body 1 is limited, 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 inside the valve body 1 from flowing back to another port 9. After the ball valve 56 of the valve body 1 is closed, it can relieve the impact of backflow on the internal structure of the valve body 1 and further improve the sealing effect.

[0033] The lubrication structure 7 includes a rubber oil seal sleeve 71. An envelope cavity 72 is arranged inside the rubber oil seal sleeve 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 envelope cavity 72. An annular oil groove 75 is opened on the side of the oil storage chamber 74. A communication groove 76 is fixedly connected to the top end of the annular oil groove 75. An inner through groove 77 is opened on the side of the top-sealing end shell 52.

[0034] The envelope cavity 72 is communicated with the narrow oil cavity 73. The rubber oil seal sleeve 71 is made of elastic rubber as a whole. The bottom end of the rubber oil seal sleeve 71 is fixedly connected to the push rod 57. The top end of the rubber oil seal sleeve 71 is fixedly connected to the bottom surface of the valve body 1. The annular oil groove 75 is communicated with the communication 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 is discharged into the inner through groove 77 through the connected communication groove 76. While lubricating the connection between the push rod 57 and the valve body 1 by the compression of the rubber oil seal sleeve 71, the liquid in the oil storage chamber 74 is filled into the communication groove 76 by hydraulic action, so that the liquid in the communication groove 76 lubricates the rotating shaft 51 in the top-sealing end shell 52, thus ensuring the normal operation of the two flow-limiting methods of the ball valve 56, avoiding the wear of the rotating shaft 51 or the push rod 57 and affecting the smoothness of rotation, and prolonging the service life of the valve body 1 by self-maintaining the worn parts of the structure.

[0035] Working principle: Keep the support rod 2 and the connected motor 3 in working condition. Drive the connected threaded sleeve shaft 4 by the rotation of the motor 3, so that the threaded sleeve shaft 4 pushes the connected push rod 57, causing the push rod 57 to push the connected ball valve 56 to slide upward along the inner wall of the bottom chamber 510, and making the connected ball valve 56 push the short rod chute 55 and the spline short rod 53 to slide. The short rod chute 55 approaches the spline short rod 53 upward and compresses the return spring. At this time, the right port 9 in the valve body 1 is communicated with the inside of the bottom chamber 510, and is communicated with the left port 9 through the bottom chamber 510. The opening of the valve is controlled through this structure, so as to conveniently control the water flow rate, realize the control of water flow cut-off and circulation, and suppress the generation of water hammer effect by slowly controlling the water flow, avoid the influence of the water hammer effect on the internal structure stability of the valve body 1, and prevent the pipeline connected to the valve body 1 from being broken after being impacted multiple times. When the push rod 57 is pushed to the topmost end by the threaded sleeve shaft 4 along the thread, at this time, the threaded sleeve shaft 4 will drive the connected push rod 57 to rotate together, and adjust the orientation of the valve passage 59 in the ball valve 56 by the rotation of the push rod 57. At this time, the ball valve 56 drives the spline short rod 53 to rotate through the short rod chute 55, so that the spline short rod 53 drives the handle 8 connected to the rotating shaft 51 to rotate. When manual control is required, the orientation of the valve passage 59 in the ball valve 56 can also be directly changed by rotating the handle 8 to drive the rotating shaft 51, so that the ball valve 56 with the staggered valve passage 59 slides along the tightly fitting sealing valve housing 58, and the two ends of the valve passage 59 of the ball valve 56 and the two ends of the port 9 of the valve body 1 are simultaneously sealed through the sealing valve housing 58, thereby improving the sealing effect of the valve body 1 and preventing the leakage of the valve body 1 and the ball valve 56. In addition, through the two control methods of the communication between the valve passage 59 and the port 9 and the communication between the bottom chamber 510 and the port 9, it can be switched according to the actual use purpose, or the two communication methods can be realized simultaneously to increase the internal flow rate of the valve body 1 and improve the practicability;

[0036] When the rotating shaft 51 rotates, it will drive the connected pressure-applying thin rod 61 to rotate along the thin rod chute 62 opened in the top sealing end shell 52. The rotated pressure-applying thin rod 61 contacts the inclined surface of the pressure-receiving inclined block 64. The pressure-receiving inclined block 64 is stressed and will push the connected force-receiving sliding piece 63 to move downward along the sliding piece groove 66, so that the bent piece 65 connected to the force-receiving sliding piece 63 contacts the elastic rod 69. After the end cone surface of the elastic rod 69 is stressed, it will slide along the sliding rod frame 68 and compress the elastic spring. The elastic rod 69 will push 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 reverse flow, the rubber sheet 610 will push the connected elastic rod 69 to slide along the sliding rod frame 68 and stretch the elastic spring, and make the rubber sheet 610 closely fit with the blocking ring 67. Thus, after the flow of the valve body 1 is restricted, the rubber sheet 610 prevents the liquid in the pipeline connected to the port 9 from flowing back into the valve body 1, and at the same time, prevents the liquid inside the valve body 1 from flowing back to another port 9. After the ball valve 56 in the valve body 1 is closed, it can relieve the impact of the reverse flow on the internal structure of the valve body 1 and further improve the sealing effect;

[0037] When the push rod 57 moves upward, the push rod 57 drives the connected rubber oil seal sleeve 71 to squeeze the liquid inside the seal sleeve cavity 72, so that the liquid in the seal sleeve cavity 72 enters the oil storage chamber 74 in a 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 communication groove 76. While lubricating the connection between the push rod 57 and the valve body 1 by the compression of the rubber oil seal sleeve 71, the liquid in the oil storage chamber 74 is filled into the communication groove 76 by hydraulic action, so that the liquid in the communication groove 76 lubricates the rotating handle shaft 51 in the top sealing end shell 52, thus ensuring the normal operation of the two flow limiting modes of the ball valve 56, avoiding the wear of the rotating handle shaft 51 or the push rod 57 and affecting the rotation smoothness, and prolonging the service life of the valve body 1 by self-maintaining the worn parts of the structure.

[0038] The present invention provides a double-sealed leak-proof ball valve. There are many methods and ways to specifically implement this technical solution. The above description is only the preferred embodiment of the present invention. It should be noted that for those of ordinary skill in the art of this technology, without departing from the principle of the present invention, several improvements and retouches can be made, and these improvements and retouches should also be regarded as the protection scope of the present invention. Each component not clearly defined in this embodiment can be realized by the prior art.

Claims

1. Double-sealed leak-proof ball valve, including valve body (1), characterized in that: The bottom surface of the valve body (1) is fixedly connected with a support rod (2). The bottom end of the support rod (2) is fixedly connected with a motor (3). The end of the output shaft of the motor (3) is fixedly connected with a threaded sleeve shaft (4). A sealing structure (5) is arranged inside the valve body (1). Anti-backflow structures (6) are arranged at both ends inside the valve body (1). A lubrication structure (7) is arranged on the bottom inner wall of the valve body (1). A handle (8) is rotatably connected to the top end of the valve body (1). Ports (9) are arranged at both the left and right ends of the valve body (1); The sealing structure (5) includes a rotating handle shaft (51). A top sealing end shell (52) is rotatably connected to the outside of the rotating handle shaft (51). A spline short rod (53) is fixedly connected to the bottom end of the rotating handle shaft (51). A bottom support block (54) is fixedly connected to the bottom end of the spline short rod (53). A short rod sliding groove (55) is arranged on the outside of the bottom support block (54). A ball valve (56) is arranged below the bottom support block (54). A valve passage (59) is opened inside the ball valve (56); A push rod (57) is fixedly connected to the center of the bottom surface of the ball valve (56). A sealing valve shell (58) is slidably connected to the outer side surface of the ball valve (56). A bottom chamber (510) is arranged on the bottom surface of the ball valve (56); The top sealing end shell (52) is fixedly connected to the top surface of the valve body (1). Vertical strips are fixedly connected to the outer surface of the spline short rod (53). 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); 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 passage (59). The bottom chamber (510) is communicated with the port (9). A return spring is arranged on the bottom surface of the bottom support block (54), and both ends of the return spring are fixedly connected to the bottom support block (54) and the ball valve (56) respectively.

2. The double-sealed leak-proof ball valve according to claim 1, characterized in that: The anti-backflow structure (6) includes a pressing thin rod (61). A thin rod sliding groove (62) is opened on the outside of the top sealing end shell (52). A force-bearing sliding piece (63) is arranged below the thin rod sliding groove (62). Two pressed inclined blocks (64) are fixedly connected above the force-bearing sliding piece (63). Bent pieces (65) are fixedly connected to both ends of the force-bearing sliding piece (63). A sliding piece groove (66) is arranged on the outside of the force-bearing sliding piece (63). An elastic rod (69) is arranged at the bottom end of each bent piece (65). A protective sleeve (611) is slidably connected to the outer surface of the elastic rod (69).

3. The double-sealed leak-proof ball valve according to claim 2, characterized in that: One end of the protective sleeve (611) away from the bent piece (65) is fixedly connected with a sliding rod frame (68). A blocking ring (67) is fixedly connected to the end of the sliding rod frame (68). A rubber piece (610) is fixedly connected to the end of the elastic rod (69) away from the bent piece (65).

4. The double-sealed leak-proof ball valve according to claim 3, wherein: The pressing thin rod (61) is slidably connected to the top sealing end shell (52). Each pressed inclined block (64) is provided with an inclined surface on its side. The blocking ring (67) is fixedly connected to the valve body (1).

5. The double-sealed leak-proof ball valve according to claim 4, characterized in that: A elastic spring is arranged on the outer side of the elastic rod (69), and two ends of the elastic spring are respectively fixedly connected with the protective sleeve (611) and the slide rod frame (68). The slide groove (66) is formed in the top inside of the valve body (1).

6. The double-sealed leak-proof ball valve according to claim 5, characterized in that: The lubrication structure (7) includes a rubber oil seal sleeve (71). A seal sleeve cavity (72) is arranged inside the rubber oil seal sleeve (71). A narrow oil cavity (73) is formed at the bottom end of the valve body (1). An oil storage cavity (74) is formed at one end of the narrow oil cavity (73) away from the seal sleeve cavity (72). An annular oil groove (75) is formed in the side surface of the oil storage cavity (74). A communication groove (76) is fixedly connected to the top end of the annular oil groove (75). An inner through groove (77) is formed in the side surface of the top sealing end shell (52).

7. The double-sealed leak-proof ball valve according to claim 6, characterized in that: The seal sleeve cavity (72) is communicated with the narrow oil cavity (73). The rubber oil seal sleeve (71) is made of elastic rubber as a whole. The bottom end of the rubber oil seal sleeve (71) is fixedly connected with the push rod (57). The top end of the rubber oil seal sleeve (71) is fixedly connected with the bottom surface of the valve body (1). The annular oil groove (75) is communicated with the communication groove (76).

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