Self-sealing dust-proof ball valve

Abstract

The application discloses a self-sealing dustproof ball valve and relates to the technical field of ball valves.The scheme comprises a first valve body and a second valve body which are installed through bolts, a valve cavity is formed between the first valve body and the second valve body, a valve core is arranged in the valve cavity, a valve rod matched with the valve core is arranged on the second valve body, a driving mechanism is installed on the second valve body, the driving mechanism is used for driving the valve rod to rotate, first sealing mechanisms matched with the valve core are arranged in the first valve body and the second valve body, the driving mechanism can drive the valve rod and the valve core to rotate, the opening and closing of the ball valve can be realized, the driving mechanism can sequentially drive the first sealing mechanism and the second sealing mechanism to operate when driving the valve core to rotate, the first sealing mechanism can improve the sealing performance of the two sides of the valve core when the valve core is closed, and the second sealing mechanism can further improve the sealing performance of one side of the valve core after the valve core is closed.

Description

Technical Field

[0001] This invention relates to the field of ball valve technology, specifically to a self-sealing dustproof ball valve. Background Technology

[0002] As a core component in fluid control, the sealing performance of ball valves directly impacts the safety and reliability of the system. Existing ball valves generally employ a sealing structure where disc springs on both sides compress the valve seat. The preload of the disc springs pushes the valve seat and valve core into a tight seal, forming a sealing interface. However, this traditional sealing solution reveals significant shortcomings in practical applications:

[0003] First, the preload distribution of disc springs has inherent limitations. Due to the elastic deformation characteristics of disc springs, the pressure they apply to the valve seat is unevenly distributed circumferentially on the sealing surface, especially with significant pressure concentration at the edges and relatively weak pressure in the central area. This pressure gradient results in insufficient actual contact area of ​​the sealing surface, making it prone to localized leakage when the medium pressure fluctuates or operating conditions change.

[0004] Secondly, existing sealing structures are insufficiently adaptable to complex operating conditions. At high temperatures, the elastic modulus of the disc spring material decreases, and the preload weakens significantly, leading to a reduced fit between the valve seat and the valve core. Furthermore, for media containing solid particles, traditional structures lack effective particle intrusion prevention designs, allowing solid particles to easily enter the spring cavity, clog the disc spring gap, and cause it to lose its elastic compensation capability, ultimately resulting in seal failure. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a self-sealing dustproof ball valve, which solves the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a self-sealing dustproof ball valve, comprising a first valve body and a second valve body mounted by bolts, with a valve cavity formed between the first valve body and the second valve body. A valve core is disposed inside the valve cavity. A valve stem cooperating with the valve core is disposed on the second valve body. A driving mechanism is mounted on the second valve body, which drives the valve stem to rotate. Both the first and second valve bodies are provided with a first sealing mechanism cooperating with the valve core. The first sealing mechanism seals both sides of the valve core. A second sealing mechanism is disposed on the valve core, which seals the connection between the valve core and the first sealing mechanism.

[0007] Preferably, the drive mechanism includes a housing fixedly connected to the top of the second valve body, a rotating rod rotatably connected through the top of the housing, the valve rod being a hollow structure, the bottom end of the rotating rod extending into the interior of the valve rod, a nut seat being threadedly connected to the outer surface of the rotating rod, limit rods being symmetrically fixedly connected to both sides of the nut seat, and a stroke groove cooperating with the limit rods being formed on the outer surface of the valve rod.

[0008] Through the above technical solution, the rotation of the rotating rod can drive the thread to move the nut seat up and down, so that the limit rods on both sides can move inside the stroke groove. With the cooperation of the stroke groove, the valve stem can be rotated, which in turn can drive the valve core to rotate, thereby realizing the opening and closing of the ball valve.

[0009] Preferably, the travel groove includes a first vertical groove, an arc-shaped groove, and a second vertical groove, wherein the top and bottom ends of the arc-shaped groove are smoothly connected to the bottom end of the first vertical groove and the top end of the second vertical groove, respectively.

[0010] Through the above technical solution, the first and second vertical grooves allow the nut seat and the limiting rod to move up and down when the rotating rod rotates. At this time, the valve rod will not be driven to rotate. However, when the limiting rod enters the arc groove, it will squeeze the inner wall of the arc groove, thereby driving the valve rod to rotate, which in turn drives the valve core to rotate.

[0011] Preferably, one end of the limiting rod is slidably connected to a guide rod, the bottom end of the guide rod is fixedly connected to the top of the second valve body, and the top end of the rotating rod is fixedly connected to a turntable.

[0012] The above technical solution guides the limiting rod, allowing it to move only up and down, while the turntable facilitates rotation of the rod.

[0013] Preferably, the first sealing mechanism includes a mounting groove formed inside the first valve body and the second valve body. A movable ring, a disc spring, and a valve seat are slidably placed inside the mounting groove. A sealing gasket that cooperates with the valve core is engaged on one side of the valve seat.

[0014] With the above technical solution, the valve seat can be pushed in conjunction with the disc spring, so that the sealing gasket can be squeezed against the outer wall of the valve core, thereby achieving the sealing of the valve core.

[0015] Preferably, the first sealing mechanism further includes two L-shaped grooves symmetrically opened inside the first valve body and the second valve body. One end of the L-shaped groove is connected to the interior of the mounting groove. The top and bottom of the moving ring are fixedly connected to the connecting plate that is slidably connected to the interior of the L-shaped groove. The interior of the L-shaped groove is slidably connected to the clamping rod that is fixedly connected to the connecting plate. The valve core is symmetrically installed with clamping plates that cooperate with the clamping rod on both sides.

[0016] With the above technical solution, when the valve stem drives the valve core to rotate and close the ball valve, when the valve core rotates to the point where the clamping plate contacts the clamping rod, the clamping plate will gradually squeeze the clamping rod as the valve core rotates. The connecting plate can drive the moving ring to move towards the valve core, thereby driving the valve seat and sealing gasket to further squeeze the valve core, thereby improving the sealing performance.

[0017] Preferably, two sealing grooves are sequentially formed on the outer surface of the valve seat, and a sealing ring is placed inside the sealing groove. The cross-sectional shape of the sealing groove is a right trapezoid.

[0018] Through the above technical solution, when the lever moves the valve seat toward the valve core, it can squeeze the sealing ring with the cooperation of the sealing groove and the inner wall of the valve body, thereby improving the sealing performance between the valve seat and the inner wall of the valve body.

[0019] Preferably, the second sealing mechanism includes a groove formed on one side of the valve core, an elastic tube is sealed and fixedly connected inside the groove, an elastic bellows is sealed and fixedly connected to one end of the elastic tube, and an arc-shaped guide plate that cooperates with the inside of the groove is fixedly connected to one end of the elastic bellows.

[0020] With the above technical solution, when the air pressure inside the groove increases, it will squeeze the elastic tube and the elastic bellows, causing the elastic tube and the elastic bellows to move outward and enter between the valve seat and the sealing gasket. This allows the elastic tube and the elastic bellows to squeeze the valve seat and the sealing gasket, thereby further improving the sealing performance of the ball valve.

[0021] Preferably, the valve core has a slot at its top, and the valve stem has a locking block fixedly connected to the bottom end of the slot. The valve core has a compression chamber at its top and at the bottom of the slot. The valve core has a through hole inside, and the two ends of the through hole are respectively connected to the groove and the compression chamber. The compression chamber has a pressure plate at its top.

[0022] With the above technical solution, the pressure plate can squeeze the extrusion chamber when it moves downward. The gas in the extrusion chamber can be squeezed into the groove through the through hole, thereby increasing the pressure in the groove.

[0023] Preferably, the valve stem and the locking block are internally slidably connected with a pressure rod that cooperates with the pressure plate, and the bottom end of the nut seat is fixedly connected with a pressure sleeve that cooperates with the pressure rod.

[0024] With the above technical solution, during the rotation of the rotating rod and valve rod, when the limiting rod enters the second vertical groove, the valve rod will not rotate, while the nut seat and the limiting rod continue to move downward. With the cooperation of the pressure sleeve, the pressure rod can be squeezed, thereby squeezing the pressure plate at the bottom and realizing the squeezing of the squeezing chamber.

[0025] This invention provides a self-sealing dustproof ball valve. It has the following beneficial effects:

[0026] This self-sealing dustproof ball valve, when closed, firstly achieves an initial seal between the valve seat and the sealing gasket by compressing the valve seat and sealing gasket through a disc spring. Secondly, during the valve stem's rotation to close the valve core, when the valve core rotates to the point where the retaining plate contacts the retaining rod, the retaining plate gradually compresses the retaining rod. This, through a connecting plate, pulls the moving ring, thereby moving the valve seat and sealing gasket towards the valve core, further improving the sealing performance between the valve core and the sealing gasket. Furthermore, as the moving ring moves the valve seat towards the valve core, the inclined bottom of the sealing groove compresses the sealing ring, increasing the sealing performance between the sealing ring and the mounting groove and valve seat.

[0027] Finally, when the valve core is closed, rotating the turntable allows the nut seat and limit rod to move downwards without the valve stem and valve core rotating. The pressure rod and pressure plate then compress the compression chamber, causing the gas in the compression chamber to enter the groove through the through hole. This allows the elastic tube and elastic bellows to extend into the valve seat and gasket, compressing the inner walls of the valve seat and gasket. This seals the valve core and gasket from the inside, further improving the sealing performance of the ball valve. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 This is a schematic diagram of the internal structure of the present invention;

[0030] Figure 3 This is a schematic diagram of the valve stem and valve core of the present invention;

[0031] Figure 4 This is a schematic diagram of the internal structure of the valve stem of the present invention;

[0032] Figure 5 This is a partial structural schematic diagram of the valve body and the first sealing mechanism of the present invention;

[0033] Figure 6 This is a schematic diagram of the internal structure of the valve body of the present invention;

[0034] Figure 7 This is a partial structural schematic diagram of the first sealing mechanism of the present invention;

[0035] Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle;

[0036] Figure 9 This is a schematic diagram of the internal structure of the valve core of the present invention.

[0037] In the diagram, 1. First valve body; 2. Second valve body; 3. Valve core; 31. Slot; 4. Valve stem; 41. Block; 5. Drive mechanism; 51. Housing; 52. Rotating rod; 53. Nut seat; 54. Limiting rod; 55. Stroke groove; 56. Guide rod; 57. Turntable; 6. First sealing mechanism; 61. Mounting groove; 62. Moving ring; 63. Disc spring; 64. Valve seat; 641. Sealing groove; 642. Sealing ring; 65. Sealing gasket; 66. L-shaped groove; 67. Connecting plate; 68. Blocking rod; 69. Blocking plate; 7. Second sealing mechanism; 71. Groove; 72. Elastic tube; 73. Elastic bellows; 74. Arc-shaped guide plate; 75. Extrusion chamber; 76. Through hole; 77. Pressure plate; 78. Pressure rod. Detailed Implementation

[0038] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0039] Example: Figures 1 to 9 As shown, a self-sealing dustproof ball valve includes a first valve body 1 and a second valve body 2 installed by bolts, forming a valve cavity between the first valve body 1 and the second valve body 2. A valve core 3 is disposed inside the valve cavity. A valve stem 4 cooperating with the valve core 3 is disposed on the second valve body 2. A drive mechanism 5 is mounted on the second valve body 2, and the drive mechanism 5 is used to drive the valve stem 4 to rotate. Both the first valve body 1 and the second valve body 2 are provided with a first sealing mechanism 6 cooperating with the valve core 3. The first sealing mechanism 6 is used to seal both sides of the valve core 3. A second sealing mechanism 7 is disposed on the valve core 3, and the second sealing mechanism 7 is used to seal the connection between the valve core 3 and the first sealing mechanism 6.

[0040] The drive mechanism 5 can drive the valve stem 4 and valve core 3 to rotate, thereby opening and closing the ball valve. When the drive mechanism 5 drives the valve core 3 to rotate, it can also drive the first sealing mechanism 6 and the second sealing mechanism 7 to operate in sequence. The first sealing mechanism 6 can improve the sealing performance of the valve core 3 on both sides when it is closed, and the second sealing mechanism 7 can further improve the sealing performance of the valve core 3 on one side after it is closed.

[0041] like Figures 2 to 4As shown, the drive mechanism 5 includes a housing 51 fixedly connected to the top of the second valve body 2. A rotating rod 52 is rotatably connected through the top of the housing 51. The valve stem 4 is a hollow structure. The bottom end of the rotating rod 52 extends into the interior of the valve stem 4. A nut seat 53 is threadedly connected to the outer surface of the rotating rod 52. Limiting rods 54 are symmetrically fixedly connected to both sides of the nut seat 53. A stroke groove 55 that cooperates with the limiting rod 54 is opened on the outer surface of the valve stem 4. A guide rod 56 is slidably connected through one end of the limiting rod 54. The bottom end of the guide rod 56 is fixedly connected to the top of the second valve body 2. A turntable 57 is fixedly connected to the top of the rotating rod 52.

[0042] In use, since the nut seat 53 is threadedly connected to the rotating rod 52, and both limit rods 54 are guided by the guide rod 56, the nut seat 53 and the limit rods 54 can only move up and down. Therefore, when the rotating rod 52 is rotated by the turntable 57, the nut seat 53 and the limit rods 54 can move up and down with the cooperation of the thread and the limit rods 54. With the cooperation of the stroke groove 55, the valve stem 4 can be rotated, which in turn can rotate the valve core 3 to realize the opening and closing of the ball valve.

[0043] Furthermore, such as Figure 3 and Figure 4 As shown, in this technical solution, the stroke groove 55 includes a first vertical groove, an arc-shaped groove, and a second vertical groove. The top and bottom ends of the arc-shaped groove are smoothly connected to the bottom end of the first vertical groove and the top end of the second vertical groove, respectively.

[0044] When the limiting rod 54 is in the first vertical groove and the second vertical groove, the nut seat 53 and the limiting rod 54 can only move up and down, and will not drive the valve stem 4 to rotate. When the limiting rod 54 enters the arc-shaped groove, the limiting rod 54 will squeeze the arc-shaped groove, which will drive the valve stem 4 to rotate, thereby realizing the rotation of the valve core 3 and realizing the opening and closing of the ball valve.

[0045] like Figures 2 to 8 As shown, the first sealing mechanism 6 includes an installation groove 61 formed inside the first valve body 1 and the second valve body 2. Inside the installation groove 61, a moving ring 62, a disc spring 63 and a valve seat 64 are slidably placed in sequence. A sealing gasket 65 that cooperates with the valve core 3 is engaged on one side of the valve seat 64.

[0046] When the ball valve is closed, the disc spring 63 has a certain elasticity, which can compress the valve seat 64 and the sealing gasket 65, thereby improving the sealing performance between the sealing gasket 65 and the valve core 3.

[0047] In this technical solution, the first sealing mechanism 6 further includes two L-shaped grooves 66 symmetrically opened inside the first valve body 1 and the second valve body 2. One end of the L-shaped groove 66 is connected to the inside of the mounting groove 61. The top and bottom of the moving ring 62 are fixedly connected to the connecting plate 67 which is slidably connected to the inside of the L-shaped groove 66. The inside of the L-shaped groove 66 is slidably connected to the locking rod 68 which is fixedly connected to the connecting plate 67. The valve core 3 is symmetrically installed on both sides with locking plates 69 that cooperate with the locking rod 68.

[0048] During the process of valve core 3 being closed and rotated by valve stem 4, when valve core 3 rotates to the point where clamping plate 69 contacts clamping rod 68, it should be noted that in this technical solution, the side of clamping plate 69 and clamping rod 68 that are in contact are both arc-shaped surfaces. Therefore, as valve core 3 continues to rotate, clamping plate 69 will gradually squeeze clamping rod 68. The moving ring 62 can be pulled by connecting plate 67, which can drive valve seat 64 and sealing gasket 65 to move towards valve core 3, thereby improving the sealing performance between valve core 3 and sealing gasket 65.

[0049] Furthermore, such as Figure 7 and Figure 8 As shown, in this technical solution, two sealing grooves 641 are sequentially formed on the outer surface of the valve seat 64, and a sealing ring 642 is placed inside the sealing groove 641. The cross-sectional shape of the sealing groove 641 is a right trapezoid.

[0050] The bottom of the sealing groove 641 is inclined, so that when the sealing ring 642 is squeezed, it slides along the bottom of the sealing groove 641. Initially, the sealing ring 642 is in contact with the bottom of the sealing groove 641, the side of the sealing groove 641 near the valve core 3, and the inner wall of the mounting groove 61. When the moving ring 62 drives the valve seat 64 to move towards the valve core 3, the sealing ring 642 can be squeezed under the cooperation of the inclined bottom of the sealing groove 641, which can increase the sealing performance between the sealing ring 642 and the mounting groove 61 and the valve seat 64.

[0051] like Figure 3 , Figure 4 and Figure 9As shown, the second sealing mechanism 7 includes a groove 71 formed on one side of the valve core 3. An elastic tube 72 is sealed and fixedly connected inside the groove 71. An elastic bellows tube 73 is sealed and fixedly connected to one end of the elastic tube 72. An arc-shaped guide plate 74 that mates with the inside of the groove 71 is fixedly connected to one end of the elastic bellows tube 73. A slot 31 is formed on the top of the valve core 3. A block 41 that mates with the slot 31 is fixedly connected to the bottom of the valve stem 4. A compression chamber 75 is formed on the top of the valve core 3 at the bottom of the slot 31. A through hole 76 is formed inside the valve core 3. The two ends of the through hole 76 are respectively connected to the groove 71 and the compression chamber 75. A pressure plate 77 is formed on the top of the compression chamber 75. A pressure rod 78 that mates with the pressure plate 77 is slidably connected inside the valve stem 4 and the block 41. A pressure sleeve that mates with the pressure rod 78 is fixedly connected to the bottom of the nut seat 53.

[0052] When the drive mechanism 5 drives the valve stem 4 to rotate until the valve core 3 is closed, the limiting rod 54 enters the second vertical groove in the stroke groove 55. At this point, the continued rotation of the turntable 57 and the rotating rod 52 causes the nut seat 53 and the limiting rod 54 to move downwards. Due to the presence of the second vertical groove, the downward movement of the nut seat 53 and the limiting rod 54 does not cause the valve stem 4 to rotate, and the valve core 3 does not rotate. As the turntable 57 and the rotating rod 52 continue to rotate, the downward movement of the nut seat 53 and the limiting rod 54 causes the bottom pressure sleeve to press the pressure rod 78, causing the pressure rod 78 to move downwards and press the pressure plate 77. The downward movement of the pressure plate 77 can then compress the compression chamber 75. In this technical solution, the compression chamber 75 can be an elastic airbag structure, and the elastic tube 72 and the elastic bellows 73 can also be supported by an elastic material. After the compression chamber 75 is compressed, the gas in the compression chamber 75 will enter the groove 71 through the through hole 76, which will increase the air pressure in the groove 71, and then compress the elastic tube 72 and the elastic bellows 73, causing the elastic tube 72 and the elastic bellows 73 to extend into the valve seat 64 and the sealing gasket 65 and compress the inner wall of the valve seat 64 and the sealing gasket 65, thereby sealing the valve core 3 and the sealing gasket 65 from the inside, thereby further improving the sealing performance of the ball valve.

[0053] Furthermore, when the ball valve is opened, the turntable 57 reverses and drives the rotating rod 52 to rotate, causing the nut seat 53 and the limiting rod 54 to move upward a certain distance in the second vertical groove of the stroke groove 55 before pressing the arc-shaped groove in the stroke groove 55, thereby driving the valve stem 4 and the valve core 3. During the upward movement of the nut seat 53 and the limiting rod 54 in the second vertical groove of the stroke groove 55, the pressure rod 78 and the pressure plate 77 lose pressure. At this time, under the pressure of the pipeline medium and the self-restoring ability of the elastic tube 72, the elastic bellows 73, and the elastic tube 72 and the elastic bellows 73, the elastic tube 72 and the elastic bellows 73 will retract into the groove 71, which will not hinder the rotation of the valve core 3. Moreover, the retraction of the elastic tube 72 and the elastic bellows 73 can increase the space on one side of the ball valve, thereby reducing the pressure of the medium on the valve core 3 on one side, thus facilitating the rotation of the valve core 3.

[0054] Working principle: During use, since the nut seat 53 is threadedly connected to the rotating rod 52, and both limit rods 54 are guided by the guide rod 56, the nut seat 53 and the limit rods 54 can only move up and down. Therefore, when the rotating rod 52 is rotated by the turntable 57, the nut seat 53 and the limit rods 54 can move up and down with the cooperation of the thread and the limit rods 54. With the cooperation of the stroke groove 55, the valve stem 4 can be rotated, which in turn can rotate the valve core 3, realizing the opening and closing of the ball valve.

[0055] When the ball valve is closed, the disc spring 63 has a certain elasticity, which can compress the valve seat 64 and the sealing gasket 65, thereby improving the sealing performance between the sealing gasket 65 and the valve core 3. During the process of the valve stem 4 driving the valve core 3 to close and rotate, when the valve core 3 rotates to the point where the retaining plate 69 contacts the retaining rod 68, it should be noted that in this technical solution, the side of the retaining plate 69 and the retaining rod 68 that are in contact are both arc-shaped surfaces. Therefore, as the valve core 3 continues to rotate, the retaining plate 69 will gradually compress the retaining rod 68. The moving ring 62 can be pulled through the connecting plate 67, thereby driving the valve seat 64 and the sealing gasket 65 to move towards the valve core 3, thereby improving the sealing performance between the valve core 3 and the sealing gasket 65.

[0056] The bottom of the sealing groove 641 is inclined outward along the valve body axis. Initially, the sealing ring 642 is in contact with the bottom of the sealing groove 641, the side of the sealing groove 641 near the valve core 3, and the inner wall of the mounting groove 61. When the moving ring 62 drives the valve seat 64 to move towards the valve core 3, the sealing ring 642 can be squeezed under the cooperation of the inclined bottom of the sealing groove 641, which can increase the sealing performance between the sealing ring 642 and the mounting groove 61 and the valve seat 64.

[0057] When the drive mechanism 5 drives the valve stem 4 to rotate until the valve core 3 is closed, the limiting rod 54 enters the second vertical groove in the stroke groove 55. At this point, the continued rotation of the turntable 57 and the rotating rod 52 causes the nut seat 53 and the limiting rod 54 to move downwards. Due to the presence of the second vertical groove, the downward movement of the nut seat 53 and the limiting rod 54 does not cause the valve stem 4 to rotate, and the valve core 3 does not rotate. As the turntable 57 and the rotating rod 52 continue to rotate, the downward movement of the nut seat 53 and the limiting rod 54 causes the bottom pressure sleeve to press the pressure rod 78, causing the pressure rod 78 to move downwards and press the pressure plate 77. The downward movement of the pressure plate 77 can then compress the compression chamber 75. In this technical solution, the compression chamber 75 can be an elastic airbag structure, and the elastic tube 72 and the elastic bellows 73 can also be supported by an elastic material. After the compression chamber 75 is compressed, the gas in the compression chamber 75 will enter the groove 71 through the through hole 76, which will increase the air pressure in the groove 71, and then compress the elastic tube 72 and the elastic bellows 73, causing the elastic tube 72 and the elastic bellows 73 to extend into the valve seat 64 and the sealing gasket 65 and compress the inner wall of the valve seat 64 and the sealing gasket 65, thereby sealing the valve core 3 and the sealing gasket 65 from the inside, thereby further improving the sealing performance of the ball valve.

[0058] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. It will be apparent to those skilled in the art that the invention is not limited to the details of the exemplary embodiments described above, and that the invention can be implemented in other specific forms without departing from its spirit or essential characteristics. Therefore, the embodiments should be considered illustrative and non-limiting in all respects, and the scope of the invention is defined by the appended claims rather than the foregoing description. Thus, all variations falling within the meaning and scope of equivalents of the claims are intended to be included within the scope of the invention. No reference numerals in the claims should be construed as limiting the scope of the claims.

[0059] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A self-sealing dustproof ball valve, comprising a first valve body (1) and a second valve body (2) installed by bolts, wherein a valve cavity is formed between the first valve body (1) and the second valve body (2), wherein a valve core (3) is provided inside the valve cavity, and a valve stem (4) cooperating with the valve core (3) is provided on the second valve body (2), wherein a drive mechanism (5) is installed on the second valve body (2), the drive mechanism (5) is used to drive the valve stem (4) to rotate, wherein a first sealing mechanism (6) cooperating with the valve core (3) is provided inside the first valve body (1) and the second valve body (2), the first sealing mechanism (6) is used to seal both sides of the valve core (3), and a second sealing mechanism (7) is provided on the valve core (3), the second sealing mechanism (7) is used to seal the connection between the valve core (3) and the first sealing mechanism (6); The drive mechanism (5) includes a housing (51) mounted on the top of the second valve body (2). A rotating rod (52) is rotatably connected through the top of the housing (51). The valve stem (4) is a hollow structure. The bottom end of the rotating rod (52) extends into the interior of the valve stem (4). A nut seat (53) is threadedly connected to the outer surface of the rotating rod (52). Limiting rods (54) are symmetrically installed on both sides of the nut seat (53). A stroke groove (55) that cooperates with the limiting rod (54) is opened on the outer surface of the valve stem (4). The first sealing mechanism (6) includes an installation groove (61) opened inside the first valve body (1) and the second valve body (2). A moving ring (62), a disc spring (63) and a valve seat (64) are slidably placed inside the installation groove (61). A sealing gasket (65) that cooperates with the valve core (3) is snapped onto one side of the valve seat (64). The first sealing mechanism (6) further includes two L-shaped grooves (66) symmetrically opened inside the first valve body (1) and the second valve body (2). One end of the L-shaped groove (66) is connected to the inside of the mounting groove (61). The top and bottom of the moving ring (62) are equipped with connecting plates (67) that are slidably connected to the inside of the L-shaped groove (66). The inside of the L-shaped groove (66) is slidably connected with a locking rod (68) installed with the connecting plate (67). Both sides of the valve core (3) are symmetrically equipped with locking plates (69) that cooperate with the locking rod (68). Two sealing grooves (641) are sequentially formed on the outer surface of the valve seat (64). A sealing ring (642) is placed inside the sealing groove (641). The cross-sectional shape of the sealing groove (641) is a right trapezoid. The second sealing mechanism (7) includes a groove (71) opened on one side of the valve core (3), an elastic tube (72) is sealed inside the groove (71), an elastic bellows tube (73) is sealed at one end of the elastic tube (72), and an arc-shaped guide plate (74) that cooperates with the inside of the groove (71) is installed at one end of the elastic bellows tube (73). The valve core (3) has a slot (31) at the top, and the valve stem (4) has a locking block (41) that cooperates with the slot (31) at the bottom. The valve core (3) has a squeezing chamber (75) at the top and at the bottom of the slot (31). The valve core (3) has a through hole (76) inside, and the two ends of the through hole (76) are connected to the groove (71) and the squeezing chamber (75) respectively. The squeezing chamber (75) has a pressure plate (77) at the top. The valve stem (4) and the locking block (41) are internally slidably connected to a pressure rod (78) that cooperates with the pressure plate (77), and the bottom end of the nut seat (53) is fitted with a pressure sleeve that cooperates with the pressure rod (78).

2. A self-sealing dust ball valve according to claim 1, wherein: The travel groove (55) includes a first vertical groove, an arc-shaped groove, and a second vertical groove. The top and bottom ends of the arc-shaped groove are smoothly connected to the bottom end of the first vertical groove and the top end of the second vertical groove, respectively.

3. The self-sealing dustproof ball valve according to claim 2, characterized in that: One end of the limiting rod (54) is slidably connected to a guide rod (56), the bottom end of the guide rod (56) is installed with the top of the second valve body (2), and the top end of the rotating rod (52) is equipped with a turntable (57).

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