Self-sealing dustproof ball valve

Abstract

The invention discloses a self-sealing dustproof ball valve, and relates to the technical field of ball valves, the self-sealing dustproof ball valve comprises a first valve body and a second valve body which are installed through a bolt, a valve cavity is formed between the first valve body and the second valve body, a valve element is arranged in the valve cavity, a valve rod matched with the valve element is arranged on the second valve body, and the first valve body and the second valve body are connected through a bolt. The ball valve comprises a first valve body and a second valve body, the first valve body is provided with a valve rod, the second valve body is provided with a driving mechanism, the driving mechanism is used for driving the valve rod to rotate, and the first valve body and the second valve body are each internally provided with a first sealing mechanism matched with a valve element. And when the driving mechanism drives the valve element to rotate, the first sealing mechanism and the second sealing mechanism can be sequentially driven to operate, the sealing performance of the two sides of the valve element can be improved through the arranged first sealing mechanism when the valve element is closed, and the sealing performance of the one side of the valve element after the valve element is closed can be further improved through the arranged second sealing mechanism.

Description

Technical Field

[0001] The present invention relates to the technical field of ball valves, in particular to a self-sealing dustproof ball valve. Background Art

[0002] As a core device in the fluid control field, the sealing performance of ball valves directly affects the safety and reliability of the system. Existing ball valves generally use a sealing structure in which disc springs on both sides squeeze the valve seat. The preload of the disc springs pushes the valve seat and valve core into close contact, forming a sealing interface. However, this traditional sealing solution has significant drawbacks in practical applications: First, the disc spring's preload distribution has inherent limitations. Due to the disc spring's elastic deformation characteristics, the pressure applied to the valve seat is unevenly distributed around the sealing surface. Pressure is particularly concentrated at the edges of the sealing surface, while pressure is relatively weak in the center. This pressure gradient results in insufficient contact area between the sealing surfaces, making localized leakage more likely to occur when the medium pressure fluctuates or operating conditions change.

[0003] Secondly, existing sealing structures are insufficiently adaptable to complex operating conditions. In high-temperature environments, the elastic modulus of the disc spring material decreases, significantly reducing the preload force and leading to a poor fit between the valve seat and the valve core. Furthermore, for media containing solid particles, the traditional structure lacks effective particle prevention. Solid particles can easily enter the spring cavity, blocking the disc spring gap and causing it to lose its elastic compensation capability, ultimately leading to seal failure. Summary of the Invention

[0004] In view of the deficiencies in the prior art, the present invention provides a self-sealing dustproof ball valve, which solves the problems raised in the background art.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: a self-sealing dustproof ball valve, comprising a first valve body and a second valve body installed by bolts, and a valve cavity is formed between the first valve body and the second valve body, a valve core is provided inside the valve cavity, a valve stem that matches the valve core is provided on the second valve body, a driving mechanism is installed on the second valve body, the driving mechanism is used to drive the valve stem to rotate, a first sealing mechanism that matches the valve core is provided inside the first valve body and the second valve body, the first sealing mechanism is used to seal both sides of the valve core, a second sealing mechanism is provided on the valve core, the second sealing mechanism is used to seal the connection between the valve core and the first sealing mechanism.

[0006] Preferably, the driving mechanism includes a shell fixedly connected to the top of the second valve body, a rotating rod is rotatably connected to the top of the shell, the valve stem is a hollow structure, the bottom end of the rotating rod extends to the inside of the valve stem, the outer surface of the rotating rod is connected to a nut seat through a thread, and the two sides of the nut seat are symmetrically fixedly connected to the limit rod, and the outer surface of the valve stem is provided with a travel groove that cooperates with the limit rod.

[0007] Through the above technical solution, the rotation of the rotating rod can drive the thread to drive the nut seat to move up and down, so that the limit rods on both sides move inside the stroke groove. With the cooperation of the stroke groove, the valve stem can be driven to rotate, and then the valve core can be driven to rotate, thereby realizing the opening and closing of the ball valve.

[0008] Preferably, the travel groove includes a first vertical groove, an arcuate groove and a second vertical groove, and the top and bottom ends of the arcuate groove are smoothly connected to the bottom end of the first vertical groove and the top end of the second vertical groove respectively.

[0009] Through the above technical solution, the first vertical groove and the second vertical groove are set, so that when the rotating rod rotates, the nut seat and the limit rod can move up and down, and the valve stem will not be driven to rotate at this time. When the limit rod enters the arc groove, it will squeeze the inner wall of the arc groove, thereby driving the valve stem to rotate, thereby driving the valve core to rotate.

[0010] Preferably, one end of the limit 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 rotating disk.

[0011] Through the above technical solution, the guide rod can be used to guide the limit rod so that the limit rod can only move up and down, and the turntable is used to facilitate the rotation of the turn rod.

[0012] Preferably, the first sealing mechanism includes an installation groove opened inside the first valve body and the second valve body, and a movable ring, a disc spring and a valve seat are slidably placed in sequence inside the installation groove. A sealing gasket that matches the valve core is clamped on one side of the valve seat.

[0013] Through the above technical solution, the valve seat can be pushed with the cooperation of 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.

[0014] Preferably, the first sealing mechanism also 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 movable ring are fixedly connected to a connecting plate that is slidably connected to the inside of the L-shaped groove, the inside of the L-shaped groove is slidably connected to a clamping rod fixedly connected to the connecting plate, and clamping plates that cooperate with the clamping rod are symmetrically installed on both sides of the valve core.

[0015] Through the above technical solution, when the valve stem drives the valve core to rotate to 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 movable ring to move toward the valve core, thereby driving the valve seat and the sealing gasket to further squeeze the valve core, thereby improving the sealing performance.

[0016] Preferably, two sealing grooves are sequentially formed on the outer surface of the valve seat, a sealing ring is placed inside the sealing groove, and the cross-sectional shape of the sealing groove is a right-angled trapezoid.

[0017] With the above technical solution, when the clamping rod drives the valve seat to move toward the valve core, the sealing ring can be squeezed by the cooperation of the sealing groove and the inner wall of the valve body, thereby improving the sealing between the valve seat and the inner wall of the valve body.

[0018] Preferably, the second sealing mechanism includes a groove opened on one side of the valve core, the interior of the groove is sealed and fixedly connected to an elastic tube, one end of the elastic tube is sealed and fixedly connected to an elastic bellows, and one end of the elastic bellows is fixedly connected to an arc-shaped guide plate that matches the interior of the groove.

[0019] Through the above technical solution, when the air pressure in the groove increases, the elastic tube and the elastic bellows will be squeezed, causing the elastic tube and the elastic bellows to move outward and enter between the valve seat and the sealing gasket, so that the elastic tube and the elastic bellows can squeeze the valve seat and the sealing gasket, thereby further improving the sealing performance of the ball valve.

[0020] Preferably, a slot is provided at the top of the valve core, a block matching the slot is fixedly connected to the bottom end of the valve stem, an extrusion chamber is provided at the top of the valve core and at the bottom of the slot, a through hole is provided inside the valve core, both ends of the through hole are respectively connected to the groove and the extrusion chamber, and a pressure plate is provided on the top of the extrusion chamber.

[0021] Through the above technical solution, the pressing plate can squeeze the extrusion chamber when it moves downward, and the gas in the extrusion chamber can be squeezed into the groove through the provided through-hole, thereby increasing the pressure in the groove.

[0022] Preferably, the valve stem and the internal part of the clamping block are slidably connected with a pressure rod that matches the pressure plate, and the bottom end of the nut seat is fixedly connected with a pressure sleeve that matches the pressure rod.

[0023] Through the above technical solution, during the rotation of the rotating rod and the valve stem, when the limit rod enters the second vertical groove, the valve stem will not rotate, and the nut seat and the limit rod will 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 to achieve squeezing of the extrusion chamber.

[0024] The present invention provides a self-sealing dustproof ball valve. It has the following beneficial effects: This self-sealing dustproof ball valve, when closed, first squeezes the valve seat and gasket via the disc spring, achieving a preliminary seal between the gasket and the valve core. Secondly, as the valve stem drives the valve core to close, when the valve core rotates to the point where the retaining plate contacts the retaining rod, the retaining plate gradually squeezes the retaining rod. The connecting plate pulls the movable ring, thereby driving the valve seat and gasket toward the valve core, further improving the seal between the valve core and the gasket. Furthermore, as the movable ring drives the valve seat toward the valve core, the tilted bottom of the sealing groove compresses the sealing ring, enhancing the seal between the sealing ring, the mounting groove, and the valve seat.

[0025] Finally, when the valve core is closed, rotating the turntable can move the nut seat and the limit rod downward without rotating the valve stem and valve core, and squeeze the extrusion chamber through the pressure rod and the pressure plate, so that the gas in the extrusion chamber enters the groove through the through hole, causing the elastic tube and the elastic bellows to stretch out and extend into the valve seat and the sealing gasket and squeeze the inner walls of the valve seat and the sealing gasket, so that the valve core and the sealing gasket can be sealed from the inside, thereby further improving the sealing performance of the ball valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a schematic diagram of the overall structure of the present invention; Figure 2 Schematic diagram of the internal structure of the present invention; Figure 3 Schematic diagram of the structure of the valve stem and valve core of the present invention; Figure 4 Schematic diagram of the internal structure of the valve stem of the present invention; Figure 5 It is a partial structural diagram of the valve body and the first sealing mechanism of the present invention; Figure 6 Schematic diagram of the internal structure of the valve body of the present invention; Figure 7 It is a partial structural schematic diagram of the first sealing mechanism of the present invention; Figure 8 For the present invention Figure 7 Enlarged view of point A in the middle; Figure 9 Schematic diagram of the internal structure of the valve core of the present invention.

[0027] In the figure, 1. first valve body; 2. second valve body; 3. valve core; 31. clamping groove; 4. valve stem; 41. clamping block; 5. driving mechanism; 51. housing; 52. rotating rod; 53. nut seat; 54. limiting rod; 55. travel 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. clamping rod; 69. clamping 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 DESCRIPTION

[0028] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0029] 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, and a valve cavity is formed between the first valve body 1 and the second valve body 2, 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, and a driving mechanism 5 is installed on the second valve body 2, and the driving mechanism 5 is used to drive the valve stem 4 to rotate, and 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, and 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, and the second sealing mechanism 7 is used to seal the connection between the valve core 3 and the first sealing mechanism 6.

[0030] The driving mechanism 5 provided can drive the valve stem 4 and the valve core 3 to rotate, so as to realize the opening and closing of the ball valve. Moreover, when driving the valve core 3 to rotate, the driving mechanism 5 can also drive the first sealing mechanism 6 and the second sealing mechanism 7 to operate in sequence. The first sealing mechanism 6 provided can improve the sealing performance of both sides of the valve core 3 when closed, and the second sealing mechanism 7 provided can further improve the sealing performance of one side of the valve core 3 after closing.

[0031] like Figures 2 to 4As shown, the driving mechanism 5 includes a shell 51 fixedly connected to the top of the second valve body 2, and a rotating rod 52 is rotatably connected to the top of the shell 51. The valve stem 4 is a hollow structure, and the bottom end of the rotating rod 52 extends to the inside of the valve stem 4. The outer surface of the rotating rod 52 is connected to a nut seat 53 through a thread, and the two sides of the nut seat 53 are symmetrically fixedly connected to the limiting rod 54. The outer surface of the valve stem 4 is provided with a travel groove 55 that cooperates with the limiting rod 54. One end of the limiting rod 54 is slidably connected to a guide rod 56, and the bottom end of the guide rod 56 is fixedly connected to the top of the second valve body 2. The top of the rotating rod 52 is fixedly connected to a turntable 57.

[0032] During use, since the nut seat 53 is connected to the rotating rod 52 by a thread, and the two limit rods 54 are guided by the guide rod 56, the nut seat 53 and the limit rod 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 rod 54 can be driven to move up and down with the cooperation of the thread and the limit rod 54, and the valve stem 4 can be driven to rotate with the cooperation of the stroke groove 55, thereby driving the valve core 3 to rotate, thereby realizing the opening and closing of the ball valve.

[0033] Further, such as Figure 3 and Figure 4 As shown, in this technical solution, the travel groove 55 includes a first vertical groove, an arcuate groove and a second vertical groove, and the top and bottom ends of the arcuate groove are smoothly connected to the bottom end of the first vertical groove and the top end of the second vertical groove respectively.

[0034] When the limiting rod 54 is located 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 groove, the limiting rod 54 will squeeze the arc groove, and then drive the valve stem 4 to rotate, thereby realizing the rotation of the valve core 3 and the opening and closing of the ball valve. like Figures 2 to 8 As shown, the first sealing mechanism 6 includes a mounting groove 61 opened inside the first valve body 1 and the second valve body 2, and a movable ring 62, a disc spring 63 and a valve seat 64 are slidably placed in sequence inside the mounting groove 61. A sealing gasket 65 that cooperates with the valve core 3 is clamped on one side of the valve seat 64.

[0035] When the ball valve is closed, the disc spring 63 has a certain elasticity and can squeeze the valve seat 64 and the sealing gasket 65, thereby improving the sealing between the sealing gasket 65 and the valve core 3.

[0036] In the present technical solution, the first sealing mechanism 6 also 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 interior of the mounting groove 61. The top and bottom of the movable ring 62 are fixedly connected to a connecting plate 67 that is slidably connected to the interior of the L-shaped groove 66. The interior of the L-shaped groove 66 is slidably connected to a clamping rod 68 fixedly connected to the connecting plate 67. Clamping plates 69 that cooperate with the clamping rod 68 are symmetrically installed on both sides of the valve core 3.

[0037] 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 clamping plate 69 contacts the clamping rod 68, it should be noted that in the present technical solution, the side where the clamping plate 69 and the clamping rod 68 contact each other are both arc-shaped surfaces. Therefore, as the valve core 3 continues to rotate, the clamping plate 69 will gradually squeeze the clamping rod 68, and the movable ring 62 can be pulled through the connecting plate 67, thereby driving the valve seat 64 and the sealing gasket 65 to move toward the valve core 3, thereby improving the sealing between the valve core 3 and the sealing gasket 65.

[0038] Further, such as Figure 7 and Figure 8 As shown, in this technical solution, two sealing grooves 641 are sequentially opened on the outer surface of the valve seat 64 , a sealing ring 642 is placed inside the sealing groove 641 , and the cross-sectional shape of the sealing groove 641 is a right-angled trapezoid.

[0039] The bottom of the sealing groove 641 is tilted so that when the sealing ring 642 is squeezed, it slides along the bottom of the sealing groove 641. Initially, the sealing ring 642 contacts the bottom of the sealing groove 641, the side of the sealing groove 641 close to the valve core 3, and the inner wall of the installation groove 61. When the movable ring 62 drives the valve seat 64 to move toward the valve core 3, the sealing ring 642 can be squeezed with the cooperation of the tilted bottom of the sealing groove 641, which can increase the sealing between the sealing ring 642 and the installation groove 61 and the valve seat 64.

[0040] like Figure 3 、 Figure 4 and Figure 9As shown, the second sealing mechanism 7 includes a groove 71 defined on one side of the valve core 3. An elastic tube 72 is hermetically fixedly connected to the interior of groove 71. An elastic bellows 73 is hermetically fixedly connected to one end of the elastic tube 72. An arc-shaped guide plate 74, which cooperates with the interior of groove 71, is fixedly connected to one end of the elastic bellows 73. A retaining groove 31 is defined at the top of the valve core 3. A retaining block 41, which cooperates with the retaining groove 31, is fixedly connected to the bottom end of the valve stem 4. An extrusion chamber 75 is defined at the top of the valve core 3, located at the bottom of the retaining groove 31. A through hole 76 is defined within the valve core 3, with both ends of the through hole 76 communicating with the groove 71 and the extrusion chamber 75, respectively. A pressure plate 77 is provided at the top of the extrusion chamber 75. A pressure rod 78, which cooperates with the pressure plate 77, is slidably connected to the interiors of the valve stem 4 and the retaining block 41. A compression sleeve, which cooperates with the pressure rod 78, is fixedly connected to the bottom end of the nut seat 53.

[0041] When the driving mechanism 5 drives the valve stem 4 to rotate until the valve core 3 is closed, the limiting rod 54 enters the second vertical slot in the stroke slot 55. At this time, the turntable 57 and the rotating rod 52 continue to rotate to drive the nut seat 53 and the limiting rod 54 to move downward. Due to the existence of the second vertical slot, the nut seat 53 and the limiting rod 54 move downward without driving the valve stem 4 to rotate. At this time, the valve core 3 does not rotate. As the turntable 57 and the rotating rod 52 continue to rotate, the nut seat 53 and the limiting rod 54 move downward, causing the bottom pressure sleeve to squeeze the pressure rod 78, causing the pressure rod 78 to move downward and squeeze the pressure plate 77. The downward movement of the pressure plate 77 can squeeze the extrusion chamber 75. Extrusion. In the present technical solution, the extrusion chamber 75 can be an elastic airbag structure, and the elastic tube 72 and the elastic bellows 73 can also be supported by an elastomeric material. After the extrusion chamber 75 is extruded, the gas in the extrusion chamber 75 will enter the groove 71 through the through hole 76, so that the air pressure in the groove 71 increases, and then the elastic tube 72 and the elastic bellows 73 are squeezed, so that the elastic tube 72 and the elastic bellows 73 extend out and extend into the valve seat 64 and the sealing gasket 65 and squeeze the inner walls of the valve seat 64 and the sealing gasket 65, so that the valve core 3 and the sealing gasket 65 can be sealed from the inside, thereby further improving the sealing performance of the ball valve.

[0042] When the ball valve is opened, the turntable 57 reverses and drives the turn rod 52 to rotate, so that the nut seat 53 and the limit rod 54 first ascend a distance in the second vertical groove of the stroke groove 55, and then squeeze the arc groove in the stroke groove 55 to drive the valve stem 4 and the valve core 3. In the process of the nut seat 53 and the limit rod 54 first ascending 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 elastic tube 72, the elastic bellows 73 and the self-recovery ability of the elastic tube 72 and the elastic bellows 73, the elastic tube 72 and the elastic bellows 73 will be retracted into the groove 71, which will not hinder the rotation of the valve core 3. In addition, due to the recovery of the elastic tube 72 and the elastic bellows 73, the space on one side of the ball valve can be enlarged, thereby reducing the pressure of the medium on the valve core 3 on one side, thereby facilitating the rotation of the valve core 3.

[0043] Working principle: When in use, since the nut seat 53 is connected to the rotating rod 52 through a thread, and the two limit rods 54 are guided by the guide rod 56, the nut seat 53 and the limit rod 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 rod 54 can be driven to move up and down with the cooperation of the thread and the limit rod 54, and the valve stem 4 can be driven to rotate with the cooperation of the stroke groove 55, thereby driving the valve core 3 to rotate, thereby realizing the opening and closing of the ball valve.

[0044] When the ball valve is closed, the disc spring 63 has a certain elasticity, which can squeeze the valve seat 64 and the sealing gasket 65, thereby improving the sealing 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 clamping plate 69 contacts the clamping rod 68, it should be noted that in the present technical solution, the contacting sides of the clamping plate 69 and the clamping rod 68 are both arc-shaped surfaces. Therefore, as the valve core 3 continues to rotate, the clamping plate 69 will gradually squeeze the clamping rod 68, and the movable ring 62 can be pulled through the connecting plate 67, thereby driving the valve seat 64 and the sealing gasket 65 to move toward the valve core 3, thereby improving the sealing between the valve core 3 and the sealing gasket 65.

[0045] The bottom of the sealing groove 641 is arranged to be tilted outward along the axial direction of the valve body. The sealing ring 642 initially contacts the bottom of the sealing groove 641, the side of the sealing groove 641 close to the valve core 3 and the inner wall of the installation groove 61 respectively. When the movable ring 62 drives the valve seat 64 to move toward the valve core 3, the sealing ring 642 can be squeezed with the cooperation of the tilted bottom of the sealing groove 641, which can increase the sealing between the sealing ring 642 and the installation groove 61 and the valve seat 64.

[0046] When the driving mechanism 5 drives the valve stem 4 to rotate until the valve core 3 is closed, the limiting rod 54 enters the second vertical slot in the stroke slot 55. At this time, the turntable 57 and the rotating rod 52 continue to rotate to drive the nut seat 53 and the limiting rod 54 to move downward. Due to the existence of the second vertical slot, the nut seat 53 and the limiting rod 54 move downward without driving the valve stem 4 to rotate. At this time, the valve core 3 does not rotate. As the turntable 57 and the rotating rod 52 continue to rotate, the nut seat 53 and the limiting rod 54 move downward, causing the bottom pressure sleeve to squeeze the pressure rod 78, causing the pressure rod 78 to move downward and squeeze the pressure plate 77. The downward movement of the pressure plate 77 can squeeze the extrusion chamber 75. Extrusion. In the present technical solution, the extrusion chamber 75 can be an elastic airbag structure, and the elastic tube 72 and the elastic bellows 73 can also be supported by an elastomeric material. After the extrusion chamber 75 is extruded, the gas in the extrusion chamber 75 will enter the groove 71 through the through hole 76, so that the air pressure in the groove 71 increases, and then the elastic tube 72 and the elastic bellows 73 are squeezed, so that the elastic tube 72 and the elastic bellows 73 extend out and extend into the valve seat 64 and the sealing gasket 65 and squeeze the inner walls of the valve seat 64 and the sealing gasket 65, so that the valve core 3 and the sealing gasket 65 can be sealed from the inside, thereby further improving the sealing performance of the ball valve.

[0047] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and that the present invention can be implemented in other specific forms without departing from the spirit or essential characteristics of the present invention. Therefore, from all points of view, the embodiments should be regarded as illustrative and non-restrictive. The scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes that fall within the meaning and range of equivalents of the claims are included in the present invention. Any reference signs in the claims should not be construed as limiting the claim to which they relate.

[0048] In addition, it should be understood that although this specification is described in terms of implementation methods, not every implementation method contains only one independent technical solution. This narrative method of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation methods 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) mounted by bolts, wherein a valve cavity is formed between the first valve body (1) and the second valve body (2), a valve core (3) is provided inside the valve cavity, a valve stem (4) matched with the valve core (3) is provided on the second valve body (2), a driving mechanism (5) is installed on the second valve body (2), the driving mechanism (5) is used to drive the valve stem (4) to rotate, a first sealing mechanism (6) matched 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), 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).

2. A self-sealing dustproof ball valve according to claim 1, characterized in that: The driving mechanism (5) includes a shell (51) mounted on the top of the second valve body (2), a rotating rod (52) is rotatably connected to the top of the shell (51), the valve stem (4) is a hollow structure, the bottom end of the rotating rod (52) extends to the inside of the valve stem (4), the outer surface of the rotating rod (52) is connected to a nut seat (53) through a thread, and limiting rods (54) are symmetrically installed on both sides of the nut seat (53), and the outer surface of the valve stem (4) is provided with a travel groove (55) that matches the limiting rod (54).

3. A self-sealing dustproof ball valve according to claim 2, characterized in that: The travel groove (55) comprises a first vertical groove, an arcuate groove, and a second vertical groove, and the top and bottom ends of the arcuate groove are smoothly connected to the bottom end of the first vertical groove and the top end of the second vertical groove, respectively.

4. The self-sealing dustproof ball valve according to claim 2, characterized in that: One end of the limit rod (54) is slidably connected to a guide rod (56), the bottom end of the guide rod (56) is mounted on the top of the second valve body (2), and a rotating disk (57) is mounted on the top of the rotating rod (52).

5. The self-sealing dustproof ball valve according to claim 1, characterized in that: The first sealing mechanism (6) comprises a mounting groove (61) provided inside the first valve body (1) and the second valve body (2), wherein a movable ring (62), a disc spring (63) and a valve seat (64) are slidably placed in sequence inside the mounting groove (61), and a sealing gasket (65) matching the valve core (3) is clamped on one side of the valve seat (64).

6. A self-sealing dustproof ball valve according to claim 5, characterized in that: The first sealing mechanism (6) further includes two L-shaped grooves (66) symmetrically provided 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 movable ring (62) are both provided with connecting plates (67) slidably connected to the inside of the L-shaped groove (66), the inside of the L-shaped groove (66) is slidably connected to a clamping rod (68) installed with the connecting plate (67), and both sides of the valve core (3) are symmetrically provided with clamping plates (69) matching the clamping rod (68).

7. A self-sealing dustproof ball valve according to claim 6, characterized in that: 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), and the cross-sectional shape of the sealing groove (641) is a right-angled trapezoid.

8. The self-sealing dustproof ball valve according to claim 3, characterized in that: The second sealing mechanism (7) comprises a groove (71) provided on one side of the valve core (3); an elastic tube (72) is installed in a sealing manner inside the groove (71); an elastic bellows (73) is installed in a sealing manner at one end of the elastic tube (72); and an arc-shaped guide plate (74) is installed at one end of the elastic bellows (73) to match the interior of the groove (71).

9. The self-sealing dustproof ball valve according to claim 8, characterized in that: A slot (31) is provided at the top of the valve core (3), a block (41) matching the slot (31) is installed at the bottom of the valve stem (4), an extrusion chamber (75) is provided at the top of the valve core (3) and at the bottom of the slot (31), a through hole (76) is provided inside the valve core (3), two ends of the through hole (76) are respectively connected to the groove (71) and the extrusion chamber (75), and a pressure plate (77) is provided at the top of the extrusion chamber (75).

10. The self-sealing dustproof ball valve according to claim 9, characterized in that: The valve stem (4) and the clamping block (41) are internally slidably connected with a pressure rod (78) that matches the pressure plate (77), and the bottom end of the nut seat (53) is equipped with a pressure sleeve that matches the pressure rod (78).

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