Low-torque stop valve for deep sea

Abstract

The invention relates to the technical field of deep sea operation valves, in particular to a deep sea low-torque stop valve which comprises a valve body and a valve deck, an input channel, an output channel, a communication port and a valve element are arranged in the valve body, a valve rod is arranged on the valve element, and the valve rod is spirally installed on the valve deck and extends out of the valve deck. A driving unit connected with the valve rod is arranged outside the valve body, a pressure relief hole penetrating through the valve element is formed in the axis of the valve element, two installation sliding grooves extending in the radial direction of the pressure relief hole are formed in the valve element, auxiliary valve elements are installed in the installation sliding grooves in a sliding mode, a connecting base is coaxially arranged at the bottom end of the valve rod, and the valve rod is elastically connected with the valve element through the connecting base. According to the technical scheme, in the process of blocking the communicating opening through the pressure relief hole of the valve element, seawater can circulate through the pressure relief hole, the pressure on the two sides of the valve element is balanced, then the pressure relief hole is blocked through the auxiliary valve element, the seawater pressure resistance borne by the valve element when the valve element moves downwards is greatly reduced, and therefore low-torque operation is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of deep-sea operation valves, and in particular to a low-torque stop valve for deep-sea use. Background Art

[0002] Globe valves are suitable for both low and medium pressures, as they offer low friction between the sealing surfaces during opening and closing. They also have a low opening height, are easy to manufacture, and are convenient to maintain. The closing principle of a globe valve is to rely on the axial pressure of the valve stem to tightly align the sealing surface of the valve core with the sealing surface of the valve seat, preventing the flow of media from bottom to top. However, this structure is a forced seal, so pressure must be applied to the valve core when the valve is closed to prevent leakage. When media enters the valve from below the valve core, the operating force must overcome the resistance generated by the friction between the valve stem and packing and the thrust generated by the pressure of the media.

[0003] The buoyancy control systems of deep-sea equipment sometimes require extremely precise adjustments to the intake and discharge of seawater to achieve subtle buoyancy adjustments, maintaining the equipment at a specific depth or attitude. In these situations, the globe valve must precisely adjust its opening by minute amounts to meet the system's precise control of seawater flow. However, in deep-sea equipment, the high pressure at depth requires a significant closing torque, making precise control of the globe valve difficult. Summary of the Invention

[0004] In view of the above problems, it is necessary to provide a low-torque stop valve for deep sea use to address the existing technical problems.

[0005] In order to solve the problems of the prior art, the technical solution adopted by the present invention is: When the cam is in the air, the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air, and the cam is in the air. When the cam is in the air, the cam is in the air, and the cam is in the air, the cam is in the air, and the cam is in the air, and the cam is in the air

[0006] Preferably, a contact block extending vertically upward is provided on the top of the auxiliary valve core, and the contact blocks of the two auxiliary valve cores are spliced ​​to form a cone with a diameter that decreases upward; the connecting seat includes a lower pressure sleeve coaxially arranged with the connecting seat, the lower pressure sleeve has a downward opening, and the inner wall of the lower pressure sleeve fits the outer wall of the contact block; a swivel is coaxially provided on the top of the lower pressure sleeve, the swivel is rotatably installed on the lower pressure sleeve, and the swivel is fixedly connected to the bottom end of the valve stem.

[0007] Preferably, the valve body is coaxially provided with an accommodating channel above the communicating port, the valve cover is installed at the top of the accommodating channel, a sleeve is coaxially provided on the valve core, the outer diameter of the sleeve is smaller than the inner diameter of the accommodating channel, and the sleeve slides in the accommodating channel; the lower pressure sleeve is provided with an edge ring surrounding the outer wall of the lower pressure sleeve, and the outer wall of the edge ring fits into the inner wall of the sleeve; a spring is provided in the sleeve, and the spring elastically connects the top of the valve core and the lower side of the edge ring, and the elastic force of the spring makes the edge ring fit into the top of the sleeve.

[0008] Preferably, a avoidance hole is coaxially provided on the top of the sleeve, and the diameter of the avoidance hole is larger than the outer diameter of the rotating ring and smaller than the outer diameter of the side ring.

[0009] Preferably, a plurality of first through holes are provided on the circumference of the sleeve, and a plurality of second through holes are provided on the circumference of the pressing sleeve.

[0010] Preferably, a fitting sealing rubber sleeve is provided at the top of the accommodating channel. When the valve core moves up to the top of the sleeve to fit the accommodating channel, the fitting sealing rubber sleeve fits the outside of the sleeve and blocks the first through hole.

[0011] Preferably, the valve core is coaxially provided with a limiting hole above the pressure relief hole, the contact block moves in the limiting hole, the inner diameter of the limiting hole is larger than the diameter of the pressure relief hole and not smaller than the outer diameter of the lower pressure sleeve; the contact block is made of magnetic metal material, and the inner wall of the limiting hole is located on one side above the installation slide groove and is embedded with an adsorption magnet for adsorbing the outer wall of the contact block.

[0012] Preferably, a horizontally extending insertion block and an insertion slot are respectively provided on opposite sides of the two contact blocks. When the two contact blocks are spliced ​​together, the insertion block is horizontally inserted into the insertion slot of the other contact block.

[0013] Preferably, a drainage groove is provided at the bottom of the contact block. When two contact blocks are spliced ​​together, the drainage grooves are spliced ​​together to form a tapered hole with an inner diameter gradually decreasing upwards.

[0014] Preferably, a sealing ring is embedded in the bottom of the contact block. When the two contact blocks are spliced ​​together, the sealing ring fits above the pressure relief hole. The outer diameter of the ring formed by the two sealing rings is larger than the aperture of the pressure relief hole, and the inner diameter is smaller than the aperture of the pressure relief hole.

[0015] Compared with the prior art, the present invention has the following beneficial effects: First, in the process of sealing the connecting port, the valve core in the present invention first releases the pressure relief hole to allow seawater to flow through the pressure relief hole, thereby balancing the pressure on both sides of the valve core. Subsequently, the pressure relief hole is sealed by the auxiliary valve core, which greatly reduces the seawater pressure resistance encountered by the valve core when it moves downward, thereby realizing low-torque operation, reducing the power requirements of the drive unit, reducing energy consumption, and also reducing the manufacturing cost and maintenance difficulty of the equipment.

[0016] Secondly, the auxiliary valve core of the present invention cuts off the flow of the medium horizontally in the direction of the medium's flow, allowing operators to precisely adjust the distance between the two auxiliary valve cores with low torque, thereby achieving fine-tuning of the opening of the communication port. This is crucial for the buoyancy control system of deep-sea equipment, meeting the need for precise control of seawater flow, allowing the equipment to more stably and accurately maintain a specific depth or posture.

[0017] Third, the valve core and the connecting seat at the bottom of the valve stem in the present invention are elastically connected, allowing the lower pressure sleeve to continue to move downward relative to the valve core after the valve core is in contact with the connecting port. During this downward movement of the lower pressure sleeve, its inner wall exerts oblique downward pressure on the outer wall of the contact block. This oblique downward pressure accurately converts the vertical downward movement force of the valve stem into the horizontal movement force of the auxiliary valve core, ensuring that the auxiliary valve core can move accurately and stably after the valve core is in contact with the connecting port, thereby reliably sealing the pressure relief hole. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a three-dimensional diagram of a low-torque stop valve for deep sea use in the first working state; Figure 2 This is a side view of a low-torque stop valve for deep sea use in the first working state; Figure 3 yes Figure 2 Cross-sectional view at AA of FIG; Figure 4 yes Figure 3 A partial enlarged view of point B; Figure 5 yes Figure 3 A three-dimensional cross-sectional view of Figure 6 yes Figure 5 A partial enlarged view of point C; Figure 7 This is a side view of a deep-sea low-torque stop valve in the second working state; Figure 8 yes Figure 7 Cross-sectional view at DD of ; Figure 9 yes Figure 8 A local enlarged view of point E; Figure 10This is a side view of a deep-sea low-torque stop valve in the third working state; Figure 11 yes Figure 10 FF cross-sectional view; Figure 12 yes Figure 11 A local enlarged view of point G.

[0019] The numbers in the figure are: 1. valve body; 11. input channel; 12. output channel; 13. connecting port; 14. accommodating channel; 141. fitting sealing rubber sleeve; 2. valve cover; 3. valve core; 31. pressure relief hole; 311. limit hole; 312. adsorption magnet; 32. mounting slide; 33. auxiliary valve core; 331. contact block; 332. plug-in block; 333. plug-in slot; 334. drainage slot; 335. sealing ring; 34. sleeve; 341. spring; 342. avoidance hole; 343. first through hole; 4. valve stem; 41. connecting seat; 411. lower pressure sleeve; 412. swivel; 413. side ring; 414. second through hole; 5. drive unit. DETAILED DESCRIPTION

[0020] In order to further understand the features, technical means, specific objectives and functions achieved by the present invention, the present invention is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0021] Reference Figures 1 to 12 : A low-torque stop valve for deep sea use, comprising a valve body 1 and a valve cover 2, wherein the valve body 1 is provided with an input channel 11 and an output channel 12, as well as a communication port 13 connecting the input channel 11 and the output channel 12, a valve core 3 for blocking the communication port 13 is provided in the valve body 1, a valve stem 4 is provided on the valve core 3, the valve stem 4 is spirally mounted on the valve cover 2 and extends to the outside of the valve cover 2, a drive unit 5 connected to the valve stem 4 is provided on the outside of the valve body 1, the valve core 3 is coaxially arranged with the communication port 13, and a valve core 3 axis is provided. There is a pressure relief hole 31 that passes through the valve core 3. Two mounting grooves 32 extending radially along the pressure relief hole 31 are provided in the valve core 3. An auxiliary valve core 33 is slidably installed in the mounting groove 32. The auxiliary valve core 33 moves radially along the pressure relief hole 31 to block and release the pressure relief hole 31; a connecting seat 41 is coaxially provided at the bottom end of the valve stem 4, and the valve stem 4 is elastically connected to the valve core 3 through the connecting seat 41. After the valve core 3 fits the connecting port 13, the valve stem 4 continues to move downward to make the auxiliary valve core 33 move toward the axis of the valve core 3 and block the pressure relief hole 31.

[0022] Before using this embodiment, the staff will install the valve body 1 and the valve cover 2 to ensure that all components are tightly connected and there is no risk of leakage. The valve core 3 is installed in the valve body 1 so that the valve core 3 is coaxial with the connecting port 13, the valve stem 4 is screwed onto the valve cover 2, and the drive unit 5 is connected. The drive unit 5 can be the handwheel shown in the figure, or it can be other rotary drives, such as an electric motor or a motor. Check the sliding of the auxiliary valve core 33 in the installation groove 32 to ensure that it can move normally. When the stop valve is opened, the valve core 3 releases the connecting port 13, and the medium flows from the input channel 11 through the connecting port 13 to the output channel 12. When the stop valve is closed, the drive unit 5 drives the valve stem 4 to rotate downward. The valve stem 4 drives the connecting seat 41 and the valve core 3 to move downward synchronously. When the valve core 3 approaches the connecting port 13 and gradually fits the connecting port 13, the auxiliary valve core 33 is still in the state of releasing the pressure relief hole 31. Seawater can flow through the pressure relief hole 31, so that the pressure on both sides of the valve core 3 remains basically balanced, greatly reducing the medium resistance encountered by the valve core 3 when moving downward. After the valve core 3 is completely fitted with the connecting port 13, as the valve stem 4 continues to move downward, the continuous downward movement of the valve stem 4 and the connecting seat 41 will drive the auxiliary valve core 33 to move horizontally in the installation slot 32 until the auxiliary valve core 33 blocks the pressure relief hole 31, cutting off the flow path of seawater through the pressure relief hole 31, thereby achieving complete closure of the valve. In the deep-sea high-pressure environment, traditional stop valves need to overcome a large pressure resistance when closing the valve due to the high seawater pressure, resulting in a large operating torque. In the process of blocking the connecting port 13, the valve core 3 in this embodiment first releases the pressure relief hole 31, allowing seawater to flow through the pressure relief hole 31, balancing the pressure on both sides of the valve core 3, and greatly reducing the seawater pressure resistance encountered by the valve core 3 when it moves downward, thereby achieving low-torque operation, reducing the power requirements of the drive unit 5, reducing energy consumption, and also reducing the manufacturing cost and maintenance difficulty of the equipment. When adjusting the valve opening, the auxiliary valve core 3 cuts off the flow of the medium in the horizontal direction of the medium flow direction, and the distance between the two auxiliary valve cores 33 can be accurately adjusted by low torque to achieve fine adjustment of the opening of the connecting port 13. This is crucial for the buoyancy adjustment system of deep-sea operating equipment, and can meet its needs for precise control of seawater flow, allowing the equipment to maintain a specific depth or posture more stably and accurately.

[0023] In order to achieve the purpose of driving the auxiliary valve core 33 to move horizontally by the continued downward movement of the valve stem 4 after the valve core 3 is attached to the communication port 13, the following features are specifically provided: A contact block 331 extending vertically upward is provided on the top of the auxiliary valve core 33, and the contact blocks 331 of the two auxiliary valve cores 33 are spliced ​​to form a cone with a diameter decreasing upward; the connecting seat 41 includes a lower pressure sleeve 411 coaxially arranged with the connecting seat 41, and the lower pressure sleeve 411 has a downward opening, and the inner wall of the lower pressure sleeve 411 fits the outer wall of the contact block 331; a swivel 412 is coaxially provided on the top of the lower pressure sleeve 411, and the swivel 412 is rotatably installed on the lower pressure sleeve 411, and the swivel 412 is fixedly connected to the bottom end of the valve stem 4.

[0024] In this embodiment, when the drive unit 5 drives the valve stem 4 to rotate downward, the rotation of the valve stem 4 causes the swivel 412 to rotate synchronously because the swivel 412 is fixedly connected to the bottom end of the valve stem 4. Simultaneously, the downward movement of the valve stem 4 causes the swivel 412 to drive the lower pressure sleeve 411 downward. Because the valve core 3 and the connecting seat 41 are elastically connected, the valve core 3 and the lower pressure sleeve 411 move downward synchronously before contacting the connecting port 13. After the valve core 3 abuts the connecting port 13, the lower pressure sleeve 411 can continue to move downward relative to the valve core 3. Because the inner wall of the lower pressure sleeve 411 abuts the outer wall of the contact block 331, and the contact blocks 331 of the two auxiliary valve cores 33 have tapered surfaces with an upwardly decreasing diameter, during the downward movement of the lower pressure sleeve 411, its inner wall exerts an oblique downward pressure on the outer wall of the contact block 331. The horizontal component of this oblique downward pressure pushes the contact block 331, thereby driving the auxiliary valve core 33 to move horizontally toward the axis of the valve core 3 within the mounting slot 32. The auxiliary valve core 33 continuously moves in the axial direction until the pressure relief hole 31 is blocked, cutting off the flow path of seawater through the pressure relief hole 31 and achieving complete sealing of the valve. In this embodiment, by designing the shape of the contact block 331, the inner wall of the lower pressure sleeve 411 is fitted into the outer wall of the contact block 331, which can accurately convert the vertical downward movement force of the valve stem 4 into the horizontal movement force of the auxiliary valve core 33, ensuring that the auxiliary valve core 33 can move accurately and stably after the valve core 3 is fitted into the connecting port 13, thereby achieving reliable sealing of the pressure relief hole 31. The setting of the swivel 412 prevents the lower pressure sleeve 411 from rotating with the valve stem 4, and only moves up and down in the vertical direction, which effectively reduces the friction and wear between the lower pressure sleeve 411 and the contact block 331. During long-term use, it can extend the service life of the components and reduce maintenance costs.

[0025] In order to achieve the elastic connection between the valve core 3 and the connecting seat 41 of the valve stem 4, the following features are specifically set: The valve body 1 is coaxially provided with an accommodating channel 14 above the communicating port 13, the valve cover 2 is installed at the top of the accommodating channel 14, and a sleeve 34 is coaxially provided on the valve core 3. The outer diameter of the sleeve 34 is smaller than the inner diameter of the accommodating channel 14, and the sleeve 34 slides in the accommodating channel 14; the lower pressure sleeve 411 is provided with a side ring 413 surrounding the outer wall of the lower pressure sleeve 411, and the outer wall of the side ring 413 fits into the inner wall of the sleeve 34; a spring 341 is provided in the sleeve 34, and the spring 341 elastically connects the top of the valve core 3 and the lower side of the side ring 413, and the elastic force of the spring 341 makes the side ring 413 fit into the top of the sleeve 34.

[0026] In this embodiment, when the drive unit 5 drives the valve stem 4 to rotate downward, the swivel ring 412 drives the lower pressure sleeve 411 downward, and the edge ring 413 on the lower pressure sleeve 411 also moves downward. During this process, because the outer wall of the edge ring 413 contacts the inner wall of the sleeve 34, the edge ring 413 slides downward along the inner wall of the sleeve 34. This ensures that the axis of the connecting seat 41 and the valve core 3 are always aligned. The spring 341 is originally in a naturally extended state or has a certain preload. Its elastic force causes the edge ring 413 to contact the top of the sleeve 34, thereby ensuring the elastic connection between the connecting seat 41 of the valve core 3 and the valve stem 4. After the valve core 3 moves downward to contact the connecting port 13, if the valve stem 4 continues to move downward, the lower pressure sleeve 411 will continue to drive the auxiliary valve core 33 to move horizontally to block the pressure relief hole 31. At the same time, the spring 341 is continuously compressed, maintaining pressure on the valve core 3 and ensuring that the valve core 3 is tightly attached to the connecting port 13.

[0027] In order to ensure that the rotation of the valve stem 4 and the swivel 412 does not cause friction with the valve core 3, the following features are specifically set: An escape hole 342 is coaxially provided at the top of the sleeve 34 . The diameter of the escape hole 342 is larger than the outer diameter of the rotating ring 412 and smaller than the outer diameter of the side ring 413 .

[0028] In this embodiment, when the valve stem 4 and swivel 412 rotate, the sleeve 34 is coaxially provided with a relief hole 342 at its top. The relief hole 342 has a diameter larger than the outer diameter of the swivel 412, allowing the swivel 412 to rotate freely within the relief hole 342 without direct contact with the sleeve 34 or valve core 3, thereby preventing friction between the two. Furthermore, the relief hole 342 has a diameter smaller than the outer diameter of the side ring 413, ensuring that the side ring 413 can move stably within the sleeve 34. When the valve stem 4 rotates downward and drives the lower pressure sleeve 411 and the side ring 413 to move downward, the swivel ring 412 rotates in the avoidance hole 342, and the side ring 413 compresses the spring 341 to push the valve core 3 downward; when the valve stem 4 rotates upward, the swivel ring 412 also rotates in the avoidance hole 342, and the spring 341 resets to push the side ring 413 and the valve core 3 upward. During the whole process, the rotation of the valve stem 4 and the swivel ring 412 will not cause friction interference with the valve core 3, ensuring the normal operation of all valve components.

[0029] In order to ensure that the medium passing through the pressure relief hole 31 can enter the output channel 12 in the initial stage of the downward movement of the valve core 3, the following features are specifically set: A plurality of first through holes 343 are provided on the circumference of the sleeve 34 , and a plurality of second through holes 414 are provided on the circumference of the lower pressing sleeve 411 .

[0030] In the initial stage of the downward movement of the valve core 3 of this embodiment, a plurality of first through holes 343 are provided on the circumference of the sleeve 34, and a plurality of second through holes 414 are provided on the circumference of the lower pressure sleeve 411. When the valve core 3 begins to move downward, in the initial stage, the first through hole 343 and the second through hole 414 are connected to each other. At this time, the medium passing through the pressure relief hole 31 can enter the output channel 12 through the pressure relief hole 31, the second through hole 414 and the first through hole 343 in sequence. As the valve stem 4 drives the lower pressure sleeve 411 to continue to move downward, the valve core 3 gradually approaches and fits the connecting port 13, and the auxiliary valve core 33 blocks the pressure relief hole 31 to close the stop valve. When the valve stem 4 rotates upward to drive the valve core 3 to move upward to open the valve, as the valve core 3 moves upward, the first through hole 343 and the second through hole 414 will be connected again. During the process of opening the valve, the medium can also be guaranteed to circulate to a certain extent, making the valve opening process smoother.

[0031] In order to ensure that when the valve core 3 is fully moved upward into the accommodating channel 14 to release the input channel 11, the communication port 13 and the output channel 12, the medium will not contact the connection position between the valve cover 2 and the valve stem 4 through the first through hole 343 and the second through hole 414 to affect the performance of the stuffing box, the following features are specifically provided: A fitting sealing rubber sleeve 141 is provided at the top of the accommodating channel 14 . When the valve core 3 moves up to the sleeve 34 to fit the top of the accommodating channel 14 , the fitting sealing rubber sleeve 141 fits the outside of the sleeve 34 and blocks the first through hole 343 .

[0032] In this embodiment, when the valve core 3 moves completely upward into the accommodating channel 14, releasing the input channel 11, the connecting port 13, and the output channel 12, the sleeve 34 moves upward along with the valve core 3. As the sleeve 34 continues to move upward, it eventually fits against the top of the accommodating channel 14. At this point, the fitting sealing rubber sleeve 141 at the top of the accommodating channel 14 fits tightly against the exterior of the sleeve 34. Due to the position and shape of the fitting sealing rubber sleeve 141, it can accurately block the first through hole 343 on the circumference of the sleeve 34. This blocks the path of the medium from flowing through the first through hole 343 and the second through hole 414 to the connection between the valve cover 2 and the valve stem 4, thereby preventing the medium from eroding and affecting the stuffing box. When the valve is open, even if the first through hole 343 and the second through hole 414 are in a connected state, due to the sealing of the first through hole 343 by the sealing rubber sleeve 141, the medium cannot pass through the first through hole 343 and the second through hole 414 to reach the area that may affect the performance of the stuffing box, thereby ensuring the sealing performance and service life of the stuffing box and maintaining the overall reliability and stability of the valve.

[0033] In order to maintain the release state of the two auxiliary valve cores 33 with respect to the pressure relief hole 31 when the lower pressure sleeve 411 does not contact the auxiliary valve core 33, the following features are specifically provided: The valve core 3 is coaxially provided with a limiting hole 311 above the pressure relief hole 31, and the contact block 331 is located in the limiting hole 311 and moves. The inner diameter of the limiting hole 311 is larger than the diameter of the pressure relief hole 31 and is not less than the outer diameter of the lower pressure sleeve 411; the contact block 331 is made of magnetic metal material, and the inner wall of the limiting hole 311 is located on one side above the installation slide groove 32 and is embedded with an adsorption magnet 312 for adsorbing the outer wall of the contact block 331.

[0034] In this embodiment, when the lower pressing sleeve 411 does not contact the secondary valve core 33, the pressure from the medium pushes the secondary valve core 33 away from each other. Since the contact block 331 is made of a magnetic metal material, and the inner wall of the limiting hole 311 is embedded with an adsorption magnet 312 on the side above the installation sliding groove 32, the adsorption magnet 312 will generate an adsorption force on the contact block 331, so that the contact block 331 is adsorbed in the limiting hole 311 away from the axis of the valve core 3, thereby driving the secondary valve core 33 to remain away from the axis of the pressure relief hole 31, maintaining the release state of the two secondary valve cores 33 to the pressure relief hole 31. In this way, during the opening of the valve and the initial downward movement of the valve core 3, the medium can smoothly pass through the pressure relief hole 31, achieving pressure balance and ensuring low-torque operation. When the valve rod 4 drives the lower pressing sleeve 411 to move downward and gradually contacts the contact block 331, the pressure applied by the lower pressing sleeve 411 to the contact block 331 will gradually overcome the adsorption force of the adsorption magnet 312 on the contact block 331, pushing the contact block 331 and the secondary valve core 33 to move towards the axis of the valve core 3, and finally blocking the pressure relief hole 31. Since the inner diameter of the limiting hole 311 is greater than the diameter of the pressure relief hole 31 and not less than the outer diameter of the lower pressing sleeve 411, this ensures that the lower pressing sleeve 411 can smoothly enter the limiting hole 311 and contact the contact block 331 during the downward movement, and also provides sufficient space for the movement of the contact block 331 to release the pressure relief hole 31.

[0035] In order to ensure the sealing effect of the two secondary valve cores 33 after being attached, the following features are specifically provided: The opposite sides of the two contact blocks 331 are respectively provided with horizontally extending insertion blocks 332 and insertion grooves 333. When the two contact blocks 331 are spliced together, the insertion block 332 of one contact block 331 is horizontally inserted into the insertion groove 333 of the other contact block 331.

[0036] In this embodiment, when the valve rod 4 drives the lower pressing sleeve 411 to move downward, the lower pressing sleeve 411 pushes the contact block 331 and the secondary valve core 33 to move towards the axis of the valve core 3. When the two contact blocks 331 gradually approach and splice together, the horizontally extending insertion block 332 of one contact block 331 will be accurately horizontally inserted into the insertion groove 333 of the other contact block 331. This insertion fitting structure further enhances the tightness of the splicing of the two contact blocks 331. Since the contact block 331 is connected to the secondary valve core 33, this allows the two secondary valve cores 33 to seal the pressure relief hole 31 more tightly when they are attached. Through the cooperation of the insertion block 332 and the insertion groove 333, not only can the secondary valve core 33 be prevented from being dislocated or loosened when subjected to external forces such as medium pressure, but also the reliability of the sealing is increased to a certain extent, and the possibility of leakage of the medium from the pressure relief hole 31 is reduced.

[0037] In order to enable the auxiliary valve core 33 to automatically open the pressure relief hole 31 under the impact of the medium below after the lower pressure sleeve 411 moves upward, the following features are specifically set: A drainage groove 334 is provided at the bottom of the contact block 331 . When two contact blocks 331 are spliced ​​together, the drainage grooves 334 are spliced ​​together to form a tapered hole whose inner diameter gradually decreases upward.

[0038] In this embodiment, when the lower pressure sleeve 411 moves upward, the pressure originally applied by the lower pressure sleeve 411 disappears, and the pressure of the medium below will come into play. Since a drainage groove 334 is provided at the bottom of the contact block 331, and when the two contact blocks 331 are spliced ​​together, the drainage groove 334 is spliced ​​to form a tapered hole with an inner diameter that gradually decreases upward. The medium with a certain pressure below will flow upward along this tapered hole. During the flow process, the medium will generate an upward thrust in the tapered hole. This thrust will act on the contact block 331, and then drive the auxiliary valve core 33 to move in a direction away from the axis of the valve core 3, and finally realize that the auxiliary valve core 33 automatically opens the pressure relief hole 31. The design of the tapered hole allows the medium to concentrate the thrust during the flow process, thereby enhancing the effect of pushing the auxiliary valve core 33 to move, and ensuring that after the valve stem 4 drives the lower pressure sleeve 411 to move upward, the auxiliary valve core 33 can quickly and reliably open the pressure relief hole 31, preparing for the subsequent opening of the valve core 3 and the circulation of the medium.

[0039] In order to ensure the sealing effect of the pressure relief hole 31 after the two auxiliary valve cores 33 are attached, the following features are specifically set: A sealing ring 335 is embedded in the bottom of the contact block 331. When the two contact blocks 331 are spliced ​​together, the sealing ring 335 fits above the pressure relief hole 31. The outer diameter of the ring formed by the two sealing rings 335 is larger than the aperture of the pressure relief hole 31, and the inner diameter is smaller than the aperture of the pressure relief hole 31.

[0040] When the two contact blocks 331 move toward the axial direction of the valve core 3 and are spliced ​​together under the action of the valve stem 4 driving the lower pressure sleeve 411, the sealing ring 335 embedded in the bottom of the contact block 331 will fit accordingly. Since the outer diameter of the circular ring formed by the two sealing rings 335 is larger than the aperture of the pressure relief hole 31, and the inner diameter is smaller than the aperture of the pressure relief hole 31, when they fit above the pressure relief hole 31, the sealing ring 335 can tightly surround the pressure relief hole 31 and fill the gap between the auxiliary valve core 33 and the pressure relief hole 31. The pressure of the medium in the deep sea environment will further squeeze the sealing ring 335, making it fit more tightly with the edge of the pressure relief hole 31, thereby effectively preventing the medium from flowing through the pressure relief hole 31, greatly enhancing the sealing effect of the two auxiliary valve cores 33 on the pressure relief hole 31 after fitting, and ensuring the sealing and reliability of the valve when it is closed.

[0041] Working Principle: When the stop valve is closed, the drive unit 5 drives the valve stem 4 downward, and the swivel 412 drives the lower pressure sleeve 411 and the edge ring 413 downward. The edge ring 413 compresses the spring 341, and the spring 341 applies pressure to the top of the valve core 3, pushing the valve core 3 downward. During the initial stage of the valve core 3's downward movement, the first through hole 343 and the second through hole 414 are interconnected. The medium passing through the pressure relief hole 31 can sequentially pass through the first through hole 343 and the second through hole 414 into the output channel 12, achieving pressure balance and reducing the resistance to the downward movement of the valve core 3. When the valve core 3 approaches the connecting port 13, the lower pressure sleeve 411 continues to move downward and contacts the contact block 331. The oblique downward pressure exerted by the lower pressure sleeve 411 on the contact block 331 pushes the auxiliary valve core 33 to move horizontally in the direction of the axis of the valve core 3. The plug-in block 332 is inserted into the plug-in groove 333, so that the two contact blocks 331 are tightly spliced. At the same time, the sealing ring 335 fits above the pressure relief hole 31, filling the gap between the auxiliary valve core 33 and the pressure relief hole 31, thereby sealing the pressure relief hole 31. The valve core 3 continues to move downward until it completely fits the connecting port 13, cutting off the medium flow path and completing the closure of the valve. The above embodiments only express one or several embodiments of the present invention, and their descriptions are relatively specific and detailed, but they cannot be understood as limiting the scope of the patent of the present invention. It should be pointed out that for ordinary technicians in this field, several variations and improvements can be made without departing from the concept of the present invention, and these all fall within the scope of protection of the present invention. Therefore, the scope of protection of the patent of the present invention shall be based on the attached claims.

Claims

1. A low-torque stop valve for deep sea use, comprising a valve body (1) and a valve cover (2), wherein the valve body (1) is provided with an input channel (11) and an output channel (12), and a communication port (13) communicating with the input channel (11) and the output channel (12), a valve core (3) for blocking the communication port (13) is provided in the valve body (1), a valve stem (4) is provided on the valve core (3), the valve stem (4) is spirally mounted on the valve cover (2) and extends to the outside of the valve cover (2), and a driving unit (5) connected to the valve stem (4) is provided on the outside of the valve body (1), characterized in that: The valve core (3) is coaxially arranged with the communication port (13); a pressure relief hole (31) penetrating the valve core (3) is provided at the axis of the valve core (3); two mounting grooves (32) extending radially along the pressure relief hole (31) are provided in the valve core (3); an auxiliary valve core (33) is slidably mounted in the mounting grooves (32); the auxiliary valve core (33) moves radially along the pressure relief hole (31) to block and release the pressure relief hole (31); A connecting seat (41) is coaxially provided at the bottom end of the valve stem (4), and the valve stem (4) is elastically connected to the valve core (3) through the connecting seat (41). After the valve core (3) fits the connecting port (13), the valve stem (4) continues to move downward to move the auxiliary valve core (33) toward the axis of the valve core (3) and block the pressure relief hole (31).

2. A deep-sea low-torque stop valve according to claim 1, characterized in that: A contact block (331) extending vertically upward is provided on the top of the auxiliary valve core (33), and the contact blocks (331) of the two auxiliary valve cores (33) are spliced ​​together to form a cone with a diameter that decreases upward; The connecting seat (41) includes a lower pressing sleeve (411) coaxially arranged with the connecting seat (41), the lower pressing sleeve (411) having a downward opening, and the inner wall of the lower pressing sleeve (411) is in contact with the outer wall of the contact block (331); A swivel (412) is coaxially arranged on the top of the lower pressing sleeve (411). The swivel (412) is rotatably mounted on the lower pressing sleeve (411). The swivel (412) is fixedly connected to the bottom end of the valve stem (4).

3. A deep-sea low-torque stop valve according to claim 2, characterized in that: The valve body (1) is coaxially provided with an accommodating channel (14) above the communication port (13), the valve cover (2) is mounted on the top of the accommodating channel (14), and a sleeve (34) is coaxially provided on the valve core (3), the outer diameter of the sleeve (34) is smaller than the inner diameter of the accommodating channel (14), and the sleeve (34) slides in the accommodating channel (14); The lower pressing sleeve (411) is provided with a side ring (413) surrounding the outer wall of the lower pressing sleeve (411), and the outer wall of the side ring (413) is in contact with the inner wall of the sleeve (34); A spring (341) is provided in the sleeve (34), and the spring (341) elastically connects the top of the valve core (3) and the lower side of the side ring (413). The elastic force of the spring (341) causes the side ring (413) to fit the top of the sleeve (34).

4. A deep-sea low-torque stop valve according to claim 3, characterized in that: A relief hole (342) is coaxially provided on the top of the sleeve (34), and the diameter of the relief hole (342) is larger than the outer diameter of the rotating ring (412) and smaller than the outer diameter of the side ring (413).

5. The deep-sea low-torque stop valve according to claim 3, characterized in that: A plurality of first through holes (343) are provided on the circumferential side of the sleeve (34), and a plurality of second through holes (414) are provided on the circumferential side of the lower pressing sleeve (411).

6. A deep-sea low-torque stop valve according to claim 5, characterized in that: A fitting sealing rubber sleeve (141) is provided at the top of the accommodating channel (14). When the valve core (3) moves upward to the sleeve (34) and fits the top of the accommodating channel (14), the fitting sealing rubber sleeve (141) fits the outside of the sleeve (34) and blocks the first through hole (343).

7. A deep-sea low-torque stop valve according to claim 6, characterized in that: The valve core (3) is coaxially provided with a limiting hole (311) above the pressure relief hole (31), and the contact block (331) is located in the limiting hole (311) and moves. The inner diameter of the limiting hole (311) is larger than the diameter of the pressure relief hole (31) and is not smaller than the outer diameter of the lower pressure sleeve (411); The contact block (331) is made of a magnetic metal material, and an adsorption magnet (312) for adsorbing the outer wall of the contact block (331) is embedded on one side of the inner wall of the limiting hole (311) located above the installation slide groove (32).

8. The deep-sea low-torque stop valve according to claim 6, characterized in that: A horizontally extending insertion block (332) and an insertion slot (333) are respectively provided on opposite sides of the two contact blocks (331); when the two contact blocks (331) are spliced ​​together, the insertion block (332) is horizontally inserted into the insertion slot (333) of the other contact block (331).

9. The deep-sea low-torque stop valve according to claim 6, characterized in that: A drainage groove (334) is provided at the bottom of the contact block (331); when two contact blocks (331) are spliced ​​together, the drainage grooves (334) are spliced ​​together to form a tapered hole whose inner diameter gradually decreases upwards.

10. The deep-sea low-torque stop valve according to claim 6, characterized in that: A sealing ring (335) is embedded in the bottom of the contact block (331). When the two contact blocks (331) are spliced ​​together, the sealing ring (335) fits above the pressure relief hole (31). The outer diameter of the ring formed by splicing the two sealing rings (335) is larger than the aperture of the pressure relief hole (31), and the inner diameter is smaller than the aperture of the pressure relief hole (31).

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