High-reliability ball valve structure

Abstract

The invention discloses a high-reliability ball valve structure which comprises a shell internally provided with a valve cavity; a spherical valve element capable of rotating around a vertical rotating shaft is installed in the valve cavity, and a horizontally-through channel is formed in the spherical valve element and used for connecting or disconnecting the front connector and the rear connector. A front valve seat and a rear valve seat which are located between the spherical valve element and the front connector and between the spherical valve element and the rear connector are arranged in the valve cavity, and springs are arranged between the front valve seat and the shell and between the rear valve seat and the shell and used for pushing the front valve seat and the rear valve seat to abut against the spherical valve element on the periphery of the channel in a sealed mode. The shell is provided with a connecting channel, the two ends of the connecting channel are communicated with the sealing abutting position of the front valve seat and the spherical valve element and the side, away from the spherical valve element, of the rear valve seat correspondingly, and the connecting channel is used for transmitting the upstream fluid pressure of the spherical valve element to the rear valve seat after sealing failure of the front valve seat and pushing the rear valve seat to abut against the spherical valve element in a sealing mode. By means of the arrangement, the downstream side of the rear valve seat bears overflow fluid pressure, then the rear valve seat and the spherical valve element are pushed to be kept sealed, and the remarkable technical progress that the use reliability of the ball valve structure is effectively improved is effectively improved.

Description

Technical Field

[0001] This invention belongs to the technical field of pipeline valves, and more specifically, relates to a ball valve structure with high reliability. Background Technology

[0002] In industrial or civil infrastructure projects, pipelines are commonly used to transport media. Due to changes in pressure or temperature, these pipelines need to be regulated. Regulating mechanisms, especially ball valves, are used in these pipelines to adjust flow rates, ensuring optimal operating conditions and environmental safety. A ball valve typically uses a ball with a circular passage as its opening and closing element. The rotation of the ball changes the relative position of the circular passage, thus achieving the opening and closing action.

[0003] Ball valves are widely used in petroleum, chemical, power generation, plumbing, water conservancy, shipbuilding, papermaking, nuclear energy, aviation, and rocket industries due to their advantages such as low fluid resistance, simple structure, tight and reliable operation, convenient operation, rapid opening and closing, and wide applicability.

[0004] However, the existing ball valve structure has the following problems in use:

[0005] During the use of ball valves, the prolonged rotation of the valve core around its vertical axis can lead to friction-induced failure of the sealing contact surface between the valve core and seat. In particular, in existing ball valve structures, whether open or closed, the upstream fluid is pressurized. The seal between the upstream front seat and the ball valve core is subjected to pressure from the pressurized fluid upstream of the ball valve core, making it more prone to seal failure. When the seal between the front seat and the ball valve core fails, the pressurized upstream fluid overflows directly to the upstream side of the rear valve seat. This overflow pressure acts directly on the upstream side of the rear valve seat, causing it to move downstream under the pressure of the overflow fluid. Ultimately, this can cause the entire ball valve structure to fail, allowing upstream fluid to bypass the closed ball valve structure and enter the downstream region.

[0006] In view of this, the present invention is hereby proposed. Summary of the Invention

[0007] The technical problem to be solved by the present invention is to overcome the shortcomings of the prior art and provide a highly reliable ball valve structure to improve the sealing performance of the ball valve structure, thereby improving the service life and reliability of the ball valve.

[0008] To solve the above-mentioned technical problems, the basic concept of the technical solution adopted by the present invention is as follows:

[0009] A highly reliable ball valve structure includes: a housing, which is a sleeve with connectors at the front and rear, and a valve chamber inside the sleeve; a spherical valve core rotatable about a vertical axis is installed in the valve chamber, and a horizontally penetrating channel is provided on the spherical valve core for connecting or disconnecting the front and rear connectors of the sleeve; front and rear valve seats are provided in the valve chamber between the spherical valve core and the front and rear connectors, and springs are provided between the front and rear valve seats and the housing for pushing the front and rear valve seats to seal against the spherical valve core around the channel; a connecting channel is provided on the housing, and the two ends of the connecting channel are connected to the sealing contact points of the front valve seat and the spherical valve core, and the side of the rear valve seat away from the spherical valve core, respectively, for transmitting the upstream fluid pressure of the spherical valve core after the front valve seat seal fails to the rear valve seat and pushing the rear valve seat to seal against the spherical valve core.

[0010] Furthermore, there is a gap between the front and rear valve seats. The gap, together with the non-channel outer wall of the spherical valve core and the inner wall of the housing, forms a sealed cavity. The sealed cavity is isolated from the channel. One end of the connecting channel is connected to the sealed cavity, and the other end is connected to the rear valve seat and the side where it abuts against the spring. This is used to transmit the fluid pressure that enters the sealed cavity after the sealing of the front valve seat and the spherical valve core fails to be achieved to the downstream side of the rear valve seat, pushing the rear valve seat to seal against the spherical valve core.

[0011] Furthermore, the housing is provided with an elastic pushing structure located downstream of the rear valve seat; the elastic pushing structure includes a pushing block, which is telescopically movable and installed in the mounting cavity on the housing, with the opposite sides of the pushing block being a first side and a second side, respectively; the first side extends out from the opening of the mounting cavity and abuts against the side of the rear valve seat away from the spherical valve core, and the second side abuts against the closed end of the mounting cavity via a spring; a sealing structure is provided between the outer wall of the pushing block and the inner wall of the mounting cavity to isolate the first side and the second side of the pushing block; the first side of the pushing block abutting against the rear valve seat is connected to the valve cavity downstream of the spherical valve core, and the second side of the pushing block connected to the spring is connected to the sealing cavity via a connecting channel, so that when the spherical valve core disconnects the channel or the seal between the spherical valve core and the front valve seat fails, the pressure difference on both sides of the spherical valve core generates a pushing force that moves the pushing block closer to the spherical valve core, thereby pushing the rear valve seat to seal against the spherical valve core.

[0012] Furthermore, the push block includes a mounting part that is telescopically movable and mounted on the mounting cavity near the opening. The outer wall of the mounting part is provided with at least one sealing ring to divide the interior of the mounting cavity into two independent parts: an open part and a closed part. The open part is connected to the valve cavity downstream of the ball valve core, and the closed part is connected to the sealed cavity via a connecting channel. The mounting part is provided with an abutting part extending from the opening of the mounting cavity. The extended end of the abutting part abuts against the side of the rear valve seat away from the ball valve core. The mounting part and the side of the abutting part facing the rear valve seat together constitute the first side. The closed part of the mounting cavity is provided with a spring extending forward and backward. The two ends of the spring abut against the closed end of the mounting cavity and the side of the mounting part away from the rear valve seat, respectively. The side of the mounting part away from the rear valve seat constitutes the second side.

[0013] Furthermore, there is a gap channel between the rear valve seat and the housing. The gap channel connects the valve cavity portion downstream of the spherical valve core with the opening portion of the mounting cavity. This is used to connect the downstream valve cavity portion with the opening portion of the mounting cavity when the channel of the spherical valve core is disconnected, and to ensure that the first side of the push block is not subjected to fluid pressure.

[0014] Furthermore, the mounting cavity is an annular cavity that opens towards the rear valve seat and closes on the opposite side; the radial dimension of the inner circumferential wall of the annular mounting cavity is larger than the radial dimension of the inner circumferential wall of the rear valve seat, and the radial dimension of the outer circumferential wall of the annular mounting cavity is less than or equal to the radial dimension of the outer circumferential wall of the rear valve seat; the pushing block is an annular block structure that can be telescopically moved back and forth and installed in the annular mounting cavity; the part of the annular pushing block located inside the mounting cavity is a mounting part that is the same size as the inner and outer circumferences of the annular cavity, and the part located outside the mounting cavity is an abutment part that is not the same size as the inner and outer circumferences of the annular cavity.

[0015] Furthermore, a spring is coaxially mounted inside the annular mounting cavity, with its two ends abutting against the second side of the push block and the sealing end of the mounting cavity, respectively; or, multiple springs are arranged at equal intervals within the annular mounting cavity, each spring extending parallel to the axial direction of the annular mounting cavity, with its two ends abutting against the second side of the push block and the sealing end of the mounting cavity, respectively.

[0016] Furthermore, at least one elastic sealing ring is provided in the middle of the inner peripheral sidewall and the middle of the outer peripheral sidewall of the annular mounting part, and the elastic sealing rings on both sides seal the inner and outer sides of the annular mounting part and the annular mounting cavity, respectively.

[0017] Furthermore, the front and rear valve seats are annular structures located on the upstream and downstream sides of the spherical valve core; the inner circumference of the front and rear valve seats facing the spherical valve core has an elastic sealing part, the inner radial dimension of the elastic sealing part is larger than the radial dimension of the channel in the middle of the spherical valve core, which is used to keep the elastic sealing part and the outer wall of the channel of the spherical valve core sealed against each other at all times, and to seal the connection between the front and rear valve seats and the spherical valve core respectively.

[0018] Furthermore, the top of the spherical valve core is provided with an upwardly protruding rotating shaft, which extends out of the housing to form a drive shaft connected to the drive component; a sealing structure is fitted around the outer periphery of the part of the rotating shaft that protrudes from the housing to seal the gap between the rotating shaft and the housing.

[0019] By adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

[0020] By setting up the above-mentioned connection channel, the upstream fluid flowing through the front valve seat and the ball valve core that have failed to seal is allowed to flow to the downstream side of the rear valve seat through the connection channel, so that both the upstream and downstream sides of the rear valve seat are subjected to the same fluid pressure, ensuring that the rear valve seat and the ball valve core are always sealed. This is a significant technological advancement that effectively improves the reliability of the ball valve structure.

[0021] At the same time, the present invention has a simple structure, significant effects, and is suitable for widespread use.

[0022] The specific embodiments of the present invention will now be described in further detail with reference to the accompanying drawings. Attached Figure Description

[0023] The accompanying drawings, as part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments and descriptions of the invention are used to explain the invention, but do not constitute an undue limitation of the invention. Obviously, the drawings described below are merely some embodiments, and those skilled in the art can obtain other drawings based on these drawings without creative effort. In the drawings:

[0024] Figure 1 This is a schematic cross-sectional view of the ball valve structure in the closed state in an embodiment of the present invention.

[0025] Description of main components in the diagram:

[0026] 1. Housing; 2. Valve cavity; 3. Ball valve core; 4. Valve seat; 5. Connecting channel; 6. Sealing cavity; 7. Spring; 8. Elastic push structure; 9. Gap channel; 31. Rotating shaft; 301. Channel; 401. Front valve seat; 402. Rear valve seat; 41. Elastic sealing part; 81. Push block; 82. Mounting cavity; 83. Guide ring; 811. First side; 812. Second side; 813. Mounting part; 814. Abutment part; 815. Sealing ring; 821. Opening part; 822. Closed part.

[0027] It should be noted that these accompanying drawings and textual descriptions are not intended to limit the scope of the invention in any way, but rather to illustrate the concept of the invention to those skilled in the art by referring to specific embodiments. Detailed Implementation

[0028] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments will be clearly and completely described below with reference to the accompanying drawings. The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0029] In the description of this invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0030] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "linking" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0031] like Figure 1 As shown in the figure, an embodiment of the present invention introduces a ball valve structure, including: a housing 1; the housing 1 includes a sleeve extending horizontally back and forth with a circular cross-section, the sleeve having a valve cavity 2 inside, and a spherical valve core 3 rotatable around a vertical axis installed in the valve cavity 2, the spherical valve core 3 having a horizontally penetrating channel 301; the channel 301 is set with the same diameter and height as the front and rear connectors of the sleeve-shaped housing 1, so that when the spherical valve core 3 rotates around the vertical axis to the connected position, the channel 301 connects the front and rear connectors, and when rotated to the closed position, the channel 301 disconnects the front and rear connectors of the housing 1, so as to achieve the purpose of opening and closing control of the channel 301 connecting the front and rear connectors of the housing 1.

[0032] In this embodiment of the invention, a valve seat 4 is provided in the valve cavity 2, located around the spherical valve core 3. The valve seat 4 is in sealing contact with the outer wall of the channel 301 of the spherical valve core 3 to seal between the rotatable spherical valve core 3 and the valve seat 4. The valve seat 4 includes a front valve seat 401 located between the spherical valve core 3 and the front connector, and a rear valve seat 402 located between the spherical valve core 3 and the rear connector. The rear side of the front valve seat 401 and the front side of the rear valve seat 402 are respectively in sealing contact with the outer wall of the spherical valve core 3 around the channel 301, so that the fluid flowing through the valve cavity 2 can only flow through the channel 301 and cannot flow through the outer wall of the spherical valve core 3, thereby realizing the purpose of using the spherical valve core 3 to control the opening and closing of the control valve.

[0033] In this embodiment of the invention, in order to achieve the effect of sealing and abutting between the front and rear valve seats and the ball valve core respectively, and to improve the sealing effect between the valve seat and the valve core, generally, springs 7 extending along the axial direction are provided between the front valve seat 401, the rear valve seat 402 and the housing 1 respectively. The springs 7 provide a driving force for the front valve seat 401 and the rear valve seat 402 to move towards the ball valve core, thereby pushing the front valve seat 401 and the rear valve seat 402 to seal and abut against the ball valve core 3 on the periphery of the channel 301 respectively, effectively ensuring the sealing effect of the ball valve structure.

[0034] However, during the use of ball valves, the prolonged rotation of the valve core around its vertical axis can cause friction between the valve core and seat, leading to seal failure. In particular, regardless of whether the ball valve is open or closed, the seal between the front seat and the spherical valve core is subjected to pressure from the upstream fluid, making it prone to seal failure. When the seal between the front seat and the spherical valve core fails, the upstream fluid pressure directly acts on the upstream side of the rear seat, causing it to overcome the spring force and move downstream. This ultimately leads to the failure of the entire ball valve structure, allowing upstream fluid to bypass the closed valve structure and flow downstream. To address these technical problems, this application is hereby proposed as follows:

[0035] In this embodiment of the invention, a connecting channel 5 is provided on the housing 1 of the ball valve structure. The two ends of the connecting channel 5 are respectively connected to the sealing abutment of the front valve seat 401 and the ball valve core 3, and the rear valve seat 402 away from the ball valve core 3. It is used to transmit the upstream fluid pressure of the ball valve core 3 after the sealing of the front valve seat 401 fails to the rear valve seat 402 and push the rear valve seat 402 to seal against the ball valve core 3.

[0036] By setting up the above-mentioned connection channel, the upstream fluid flowing through the front valve seat and the ball valve core that have failed to seal is allowed to flow to the downstream side of the rear valve seat through the connection channel, so that both the upstream and downstream sides of the rear valve seat are subjected to the same fluid pressure, ensuring that the rear valve seat and the ball valve core are always sealed. This is a significant technological advancement that effectively improves the reliability of the ball valve structure.

[0037] In this embodiment of the invention, there is a gap between the front valve seat 401 and the rear valve seat 402. The gap, together with the non-channel outer wall of the ball valve core 3 and the inner wall of the housing 1, forms a sealed cavity 6. The sealed cavity 6 is isolated from the fluid channel of the ball valve structure by the sealing action of the front valve seat, the rear valve seat and the ball valve core. One end of the connecting channel 5 is connected to the sealed cavity 6, and the other end is connected to the rear valve seat 402 and the side of the spring 7. This channel is used to transmit the fluid pressure that enters the sealed cavity 6 after the sealing of the front valve seat 401 and the ball valve core 3 fails to be transmitted to the downstream side of the rear valve seat 402, pushing the rear valve seat 402 to seal against the ball valve core 3.

[0038] With the above settings, after the seal between the front valve seat and the ball valve core fails, the overflowing upstream fluid enters the sealing cavity and flows through the connecting channel to the side of the rear valve seat that abuts against the spring. This causes the upstream fluid pressure to act on both the upstream and downstream sides of the rear valve seat simultaneously, preventing the rear valve seat from directly bearing the fluid pressure of the compression spring. This prevents the rear valve seat from separating from the ball valve core due to water pressure impact, thus preventing the rear valve seat from failing to seal.

[0039] In this embodiment of the invention, the housing 1 is provided with an elastic pushing structure 8 located downstream of the rear valve seat 401; the elastic pushing structure 8 includes a pushing block 81, which is telescopically mounted in a mounting cavity 82 on the housing 1, and the two opposite sides of the pushing block 81 are a first side 811 and a second side 812, respectively; the first side 811 extends out from the opening of the mounting cavity 82 and abuts against the side of the rear valve seat 402 away from the ball valve core 3, and the second side abuts against the closed end of the mounting cavity 82 via a spring 7; a sealing structure is provided between the outer wall of the pushing block 81 and the inner wall of the mounting cavity 82 for pushing... The first side 811 and the second side 812 of the moving block 81 are isolated from each other; the first side 811 of the pushing block 81 that abuts against the rear valve seat 402 is connected to the valve cavity 2 downstream of the ball valve core 3, and the second side 812 of the pushing block 81 that is connected to the spring 7 is connected to the sealing cavity 6 through the connecting channel 5. When the ball valve core 3 disconnects the channel 301 or the ball valve core 3 fails to seal with the front valve seat 401, the pressure difference on both sides of the ball valve core 3 generates a pushing force that moves the pushing block 81 toward the side closer to the ball valve core 3, thereby pushing the rear valve seat 402 to seal against the ball valve core 3.

[0040] With the above configuration, the rear valve seat is connected to the spring via the push block, so that the push block can transmit the spring's push-pull force to the rear valve seat. This ensures that the upstream fluid pressure after the front valve seat seal fails acts directly on the side where the push block and spring are connected, effectively guaranteeing that the fluid pressure borne by the push block is on the side of the spring's extension and contraction direction. This further effectively avoids problems such as the spring being compressed by the upstream fluid pressure and causing the rear valve seat seal to fail.

[0041] In this embodiment of the invention, the pushing block 81 includes a mounting part 813, which is telescopically mounted on the mounting cavity 82 near the opening. The outer wall of the mounting part 813 is provided with at least one sealing ring 815 to divide the interior of the mounting cavity 82 into two independent parts: an opening part 821 and a closed part 822. The opening part 821 is connected to the valve cavity 2 downstream of the ball valve core 3, and the closed part 822 is connected to the sealed cavity 6 via a connecting channel 5. The mounting part 813 is provided with a self-opening mechanism from the mounting cavity 82. The protruding abutment portion 814 abuts against the side of the rear valve seat 402 away from the ball valve core 3. The mounting portion 813 and the side of the abutment portion 814 facing the rear valve seat 402 together form the first side 811. The closed portion 822 of the mounting cavity 82 is provided with a spring 7 extending back and forth. The two ends of the spring 7 abut against the closed end of the mounting cavity 82 and the side of the mounting portion 813 away from the rear valve seat 402, respectively. The side of the mounting portion 813 away from the rear valve seat 402 forms the second side 812.

[0042] With the above configuration, the push block connecting the rear valve seat and the spring is subjected to upstream and downstream fluid pressures on its opposite sides, respectively. The pressure difference between the upstream and downstream sides of the closed spherical valve core drives the push block to move upstream, thereby pushing the rear valve seat to seal against the spherical valve core. This further improves the sealing effect between the rear valve seat and the spherical valve core, effectively preventing problems such as sealing failure between the rear valve seat and the spherical valve core.

[0043] Connected to the spring, the push block transmits the spring's push-pull force to the rear valve seat, so that the upstream fluid pressure after the front valve seat seal fails directly acts on the side where the push block and spring are connected. This effectively ensures that the fluid pressure borne by the push block is on the side of the spring's extension and contraction direction, further effectively preventing the spring from being compressed by the upstream fluid pressure and causing the rear valve seat seal to fail.

[0044] In this embodiment of the invention, a gap channel 9 is provided between the rear valve seat 402 and the housing 1. The gap channel 9 connects the valve cavity 2 downstream of the spherical valve core 3 with the opening 821 of the mounting cavity 82, so that when the channel 301 of the spherical valve core 3 is disconnected, the valve cavity 2 downstream of the spherical valve core 3 is connected with the opening 821 of the mounting cavity 82, and the first side 811 of the push block 81 is not subjected to fluid pressure.

[0045] In this embodiment of the invention, the mounting cavity 82 is an annular cavity that opens towards the rear valve seat 402 and is closed on the opposite side; the radial dimension of the inner circumferential wall of the annular mounting cavity 82 is larger than the radial dimension of the inner circumferential wall of the rear valve seat 402, and the radial dimension of the outer circumferential wall of the annular mounting cavity 82 is less than or equal to the radial dimension of the outer circumferential wall of the rear valve seat 402; the pushing block 81 is an annular block structure that can be telescopically moved back and forth and installed in the annular mounting cavity 82; the part of the annular pushing block 81 located inside the mounting cavity 82 is a mounting part 813 that is the same size as the inner and outer circumferences of the annular cavity 82, and the part located outside the mounting cavity 82 is an abutment part 814 that is not the same size as the inner and outer circumferences of the annular cavity 82. Preferably, the outer radial dimension of the annular abutment portion 814 is smaller than the outer radial dimension of the annular mounting portion 813, and the inner radial dimension of the annular abutment portion 814 is larger than the inner radial dimension of the annular mounting portion 813. This allows the gap channel 9 to directly connect the mounting portion 813 towards the spherical valve core 3 and the valve cavity 2 downstream of the spherical valve core 3. This ensures that the first side 811 of the push block 81 only bears the fluid pressure downstream of the spherical valve core 3 after pressure loss, effectively preventing problems such as the push block 81 being unable to move upstream and the failure of the rear valve seat 402 and the spherical valve core 3 to seal.

[0046] In this embodiment of the invention, a spring 7 coaxially arranged is fitted inside the annular mounting cavity 82, with both ends of the spring 7 abutting against the second side 812 of the push block 81 and the sealing end of the mounting cavity 82, respectively; or, multiple springs 7 are arranged at equal intervals within the annular mounting cavity, each spring 7 extending parallel to the axial direction of the annular mounting cavity, with both ends abutting against the second side 812 of the push block 81 and the sealing end of the mounting cavity 82, respectively. Preferably, only one coaxially extending spring 7 is fitted inside the annular mounting cavity 82, with the front end of the spring 7 abutting against the second side 812 of the push block 81 and the rear end of the spring abutting against the sealing end of the mounting cavity 82, respectively.

[0047] In this embodiment of the invention, at least one elastic sealing ring 815 is provided in the middle of the inner peripheral sidewall and the middle of the outer peripheral sidewall of the annular mounting part 813, and the elastic sealing rings 815 on both sides seal the inner and outer sides of the annular mounting part 813 and the annular mounting cavity 82, respectively.

[0048] In this embodiment of the invention, to further ensure the smooth forward and backward movement of the push block 81, a guide ring 83 can be provided between the opening side of the mounting cavity 82 and the rear valve seat 402. The guide ring 83 is sleeved between the outer peripheral side of the annular abutment portion 814 and the inner peripheral side of the housing 1. The inner radial dimension of the guide ring 83 is set to be the same as the outer radial dimension of the annular abutment portion 814, so as to guide the annular abutment portion 814 to move smoothly back and forth. Preferably, the inner and outer peripheral walls of the guide ring 83 are respectively provided with at least one sealing ring for sealing between the guide ring 83 and the housing 1, and between the annular abutment portion 814 and the guide ring 83.

[0049] In this embodiment of the invention, the front valve seat 401 and the rear valve seat 402 are respectively annular structures disposed on the upstream and downstream sides of the spherical valve core 3. The inner circumference of the front valve seat 401 and the rear valve seat 402 facing the spherical valve core 3 has a ring of elastic sealing portion 41. The radial dimension of the inner circumference of the elastic sealing portion 41 is larger than the radial dimension of the channel 301 in the middle of the spherical valve core 3. This ensures that the elastic sealing portion 41 and the outer wall of the channel 301 of the spherical valve core 3 are always sealed and abutted, thus sealing the connection between the front valve seat 401, the rear valve seat 402, and the spherical valve core 3. Simultaneously, the corner side of the elastic sealing portion 41 facing the spherical valve core 3 is a hemispherical surface concentrically arranged with the same diameter as the outer wall of the spherical valve core 3, so that the elastic sealing portion 41 and the spherical valve core 3 are in a sealed and close contact, achieving the effect of sealing the gap between the spherical valve core 3 and the valve seat 4. In addition, the elastic sealing part 41 is an independent part embedded in the valve seat 4. At least one sealing ring is provided at the assembly connection between the elastic sealing part 41 and the valve seat 4 to prevent leakage from flowing through the valve seat.

[0050] In this embodiment of the invention, the top of the spherical valve core 3 is provided with an upwardly protruding rotating shaft 31. The rotating shaft 31 extends out of the housing 1 to form a driving shaft connected to a manual driving component such as a handle or an automatic driving component such as a drive motor, so as to control the spherical valve core 3 to rotate around the vertical rotating shaft to open or close the channel 301 accordingly. At the same time, a sealing structure is fitted on the outer periphery of the part of the rotating shaft 31 that protrudes from the housing 1 to seal the gap between the rotating shaft 31 and the housing 1, so that the sealed cavity 6 formed by the distance between the two valve seats is not connected to the outside atmosphere, effectively preventing the leakage of upstream pressurized fluid after the front valve seat seal fails.

[0051] In this embodiment of the invention, the upstream side of the front valve seat 401 is connected to the housing 1 via a spring 7. The spring 7 extends along the front-rear direction and is embedded inside the housing 1 to push the front valve seat 401 to seal against the upstream side of the ball valve core 3. At the same time, in order to ensure the sealing between the valve seat 4 and the housing 1, at least one sealing ring can be provided at the junction of the annular front valve seat 401 and the inner peripheral wall of the housing 1, and at least one sealing ring can be provided at the junction of the annular rear valve seat 402 and the inner peripheral wall of the housing 1, so as to achieve the effect of sealing the outer wall of the valve seat 4 and the inner wall of the valve cavity 2, effectively ensuring the isolation between the sealing space 6 and the internal flow channel of the ball valve structure.

[0052] In this embodiment of the invention, the external forces borne by the front valve seat 401 include the following:

[0053] F 活塞 The piston force is exerted by the fluid medium on the front valve seat 401, and the direction of the external force is towards the ball valve core 3;

[0054] F 预紧The preload force is generated by the spring 7 that presses against the front valve seat 401, and the direction of the external force is towards the ball valve core 3;

[0055] F 介质 The force exerted by the fluid medium in the clearance of the sealing surface is directed away from the ball valve core 3.

[0056] F 必需 The minimum force required on the sealing surface for the elastic sealing part 41 of the front valve seat 401 and the ball valve core 3 to achieve a seal is the direction of the external force away from the ball valve core 3.

[0057] When F 活塞 +F 预紧 -F 介质 -F 必需 When the value is greater than 0, a seal is achieved between the front valve seat 401 and the ball valve core 3.

[0058] Similarly, the external forces that the rear valve seat 402 bears include the following:

[0059] F 活塞 The piston force introduces the fluid medium in the valve chamber 2 to the rear end of the rear valve seat 402. The fluid medium acts on the rear valve seat 402, and the external force is directed towards the ball valve core 3.

[0060] F 预紧 The preload force is generated by the spring 7 that presses against the valve seat 402, and the direction of the external force is towards the ball valve core 3;

[0061] F 介质 The force exerted by the fluid medium in the clearance of the sealing surface is directed away from the ball valve core 3.

[0062] F 必需 The minimum force required on the sealing surface for the elastic sealing part 41 of the rear valve seat 402 and the ball valve core 3 to achieve a seal is the direction of the external force away from the ball valve core 3.

[0063] When F 活塞 +F 预紧 -F 介质 -F 必需 When the value is greater than 0, a seal is achieved between the rear valve seat 402 and the ball valve core 3.

[0064] By drilling a hole in the side wall of the housing 1 downstream of the valve chamber 2 to form a connecting channel 5, the fluid medium upstream of the valve chamber 2 is introduced to the downstream side of the rear valve seat 402 and acts on the push block 81. Under the pressure of the fluid medium, the push block 81 pushes the rear valve seat 402 to move closer to the spherical valve core 3, ensuring that the elastic sealing part 41 provided on the rear valve seat 402 presses the spherical valve core 3, thereby achieving a highly reliable sealing effect between the rear valve seat 402 and the spherical valve core 3.

[0065] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-described technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A highly reliable ball valve structure, comprising: The housing (1) is a sleeve with joints at the front and rear, and a valve chamber (2) is provided inside the sleeve; A spherical valve core (3) that can rotate around a vertical axis is installed in the valve cavity (2). The spherical valve core (3) has a horizontally penetrating channel (301) for connecting or disconnecting the front and rear joints of the sleeve. Its features are: The valve cavity (2) is provided with front and rear valve seats (4) located between the ball valve core (3) and the front and rear connectors. Springs (7) are provided between the front and rear valve seats (4) and the housing (1) respectively, for pushing the front and rear valve seats (4) to seal against the ball valve core (3) on the periphery of the channel (301). The housing (1) is provided with a connecting channel (5). The two ends of the connecting channel (5) are respectively connected to the front valve seat (401) and the sealing contact point of the ball valve core (3) and the rear valve seat (402) away from the ball valve core (3). It is used to transmit the upstream fluid pressure of the ball valve core (3) after the sealing of the front valve seat (401) fails to the rear valve seat (402) and push the rear valve seat (402) to seal against the ball valve core (3).

2. The high-reliability ball valve structure according to claim 1, characterized in that, There is a gap between the front and rear valve seats (4), and the gap, together with the non-channel outer wall of the ball valve core (3) and the inner wall of the housing (1), forms a sealed cavity (6), which is isolated from the channel (301); One end of the connecting channel (5) is connected to the sealing cavity (6), and the other end is connected to the rear valve seat (402) and the side of the spring (7) that abuts against it. This is used to transmit the fluid pressure that enters the sealing cavity (6) after the sealing of the front valve seat (401) and the ball valve core (3) fails to the downstream side of the rear valve seat (402) and push the rear valve seat (402) to seal against the ball valve core (3).

3. The high-reliability ball valve structure according to claim 2, characterized in that, The housing (1) is provided with an elastic push structure (8) located downstream of the rear valve seat (401); The elastic push structure (8) includes a push block (81) and a mounting cavity (82) mounted on the housing (1) that can be telescopically moved back and forth. The two opposite sides of the push block (81) are a first side (811) and a second side (812). The first side (811) extends out from the opening of the mounting cavity (82) and abuts against the side of the rear valve seat (402) away from the ball valve core (3). The second side abuts against the closed end of the mounting cavity (82) via a spring (7). A sealing structure is provided between the outer wall of the push block (81) and the inner wall of the mounting cavity (82) to isolate the first side (811) and the second side (812) of the push block (81); The first side (811) of the push block (81) that abuts against the rear valve seat (402) is connected to the valve cavity (2) downstream of the ball valve core (3). The second side (812) of the push block (81) that is connected to the spring (7) is connected to the sealing cavity (6) through the connecting channel (5). When the ball valve core (3) disconnects the channel (301) and the ball valve core (3) fails to seal with the front valve seat (401), the pressure difference on both sides of the ball valve core (3) generates a pushing force that acts on the push block (81) to move closer to the ball valve core (3), thereby pushing the rear valve seat (402) to seal against the ball valve core (3).

4. The high-reliability ball valve structure according to claim 3, characterized in that, The push block (81) includes, The mounting part (813) is installed in the mounting cavity (82) near the opening, and the outer wall of the mounting part (813) is provided with at least one sealing ring (815) to divide the interior of the mounting cavity (82) into two independent parts, the opening part (821) and the closed part (822). The open portion (821) is connected to the valve cavity (2) downstream of the ball valve core (3), and the closed portion (822) is connected to the sealed cavity (6) via the connecting channel (5); The mounting part (813) is provided with an abutting part (814) extending from the opening of the mounting cavity (82). The protruding end of the abutting part (814) abuts against the side of the rear valve seat (402) away from the ball valve core (3). The mounting part (813) and the abutting part (814) facing the rear valve seat (402) together constitute the first side (811). The enclosed portion (822) of the mounting cavity (82) is provided with a spring (7) extending back and forth. The two ends of the spring (7) abut against the enclosed end of the mounting cavity (82) and the side of the mounting part (813) away from the rear valve seat (402), respectively. The side of the mounting part (813) away from the rear valve seat (402) constitutes the second side (812).

5. The high-reliability ball valve structure according to claim 4, characterized in that, There is a gap channel (9) between the rear valve seat (402) and the housing (1). The gap channel (9) connects the valve cavity (2) downstream of the ball valve core (3) with the opening (821) of the mounting cavity (82). This is used to connect the downstream valve cavity (2) with the opening (821) of the mounting cavity (82) when the channel (301) of the ball valve core (3) is disconnected, and the first side (811) of the push block (81) is not subjected to fluid pressure.

6. The high-reliability ball valve structure according to claim 5, characterized in that, The mounting cavity (82) is an annular cavity that opens toward the rear valve seat (402) and is closed on the opposite side; The radial dimension of the inner peripheral wall of the annular mounting cavity (82) is greater than the radial dimension of the inner peripheral wall of the rear valve seat (402), and the radial dimension of the outer peripheral wall of the annular mounting cavity (82) is less than or equal to the radial dimension of the outer peripheral wall of the rear valve seat (402). The push block (81) is an annular block structure that can be extended and retracted back and forth and is installed in the annular mounting cavity (82); The portion of the annular pusher block (81) located inside the mounting cavity (82) is a mounting portion (813) that is the same size as the inner and outer circumferences of the annular cavity (82), and the portion located outside the mounting cavity (82) is an abutting portion (814) that is not the same size as the inner and outer circumferences of the annular cavity (82).

7. The high-reliability ball valve structure according to claim 6, characterized in that, A spring (7) is coaxially mounted inside the annular mounting cavity (82). The two ends of the spring (7) abut against the second side (812) of the push block (81) and the sealing end of the mounting cavity (82), respectively. Alternatively, multiple springs (7) are arranged at equal intervals within the annular mounting cavity. Each spring (7) extends parallel to the axial direction of the annular mounting cavity, with its two ends abutting against the second side (812) of the push block (81) and the sealing end of the mounting cavity (82), respectively.

8. The high-reliability ball valve structure according to claim 6, characterized in that, The inner circumferential sidewall and the outer circumferential sidewall of the annular mounting part (813) are each provided with at least one elastic sealing ring (815), and the elastic sealing rings (815) on both sides seal the inner and outer walls of the annular mounting part (813) and the annular mounting cavity (82), respectively.

9. A high-reliability ball valve structure according to any one of claims 1 to 8, characterized in that, The front and rear valve seats (4) are annular structures located on the upper and lower sides of the spherical valve core (3); The inner circumference of the front and rear valve seats (4) facing the spherical valve core (3) has an elastic sealing part (41). The inner radial dimension of the elastic sealing part (41) is larger than the radial dimension of the channel (301) in the middle of the spherical valve core (3). It is used to keep the elastic sealing part (41) and the outer wall of the channel (301) of the spherical valve core (3) sealed against each other, and to seal the connection between the front and rear valve seats (4) and the spherical valve core (3) respectively.

10. A high-reliability ball valve structure according to any one of claims 1 to 8, characterized in that, The top of the ball valve core (3) is provided with an upwardly protruding rotating shaft (31), which extends out of the housing (1) to form a drive rotating shaft connected to the drive component; The outer periphery of the part of the rotating shaft (31) that protrudes from the housing is fitted with a sealing structure to seal the gap between the rotating shaft (31) and the housing (1).

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